Indoor unit, non-communication air conditioning unit, control method thereof, and readable storage medium

Abstract

The application provides an indoor unit, a non-communication air conditioning unit and a control method and readable storage medium thereof. The non-communication air conditioning unit is characterized in that a relay is additionally arranged in the indoor unit, so that the main control board can control whether the temperature controller is powered on or not through the relay according to the pipe temperature detected by the temperature sensing bag, and further control the start and stop of the indoor unit and the outdoor unit. Therefore, when the indoor unit is in a low-load refrigeration operation process or the evaporator is frosted due to the stop of the indoor fan, the outdoor unit can be automatically stopped, so that the problem of liquid return is avoided, the reliability and safety of the unit are greatly improved, the failure rate of the unit caused by liquid return is reduced, and the service life of the unit is prolonged.

Description

Technical Field

[0001] This invention relates to the field of intelligent control technology, specifically to an indoor unit, a non-communication air conditioning unit, its control method, and a readable storage medium. Background Technology

[0002] Non-communication air conditioning units are a mainstream product in the North American market, featuring flexible combination of indoor and outdoor units. As a result, there is no communication between the indoor and outdoor units. The indoor unit cannot send signals to the main board to control the outdoor unit to turn on and off. Therefore, when the indoor unit is running at low load or the indoor fan stops during cooling, the evaporator of the indoor unit will frost up and will not be able to send a shutdown signal to the outdoor unit.

[0003] During cooling operation, if the indoor unit's evaporator frosts due to low load or the indoor unit's fan stopping, this is an abnormal phenomenon and should signal the outdoor unit to shut down to protect it. Otherwise, if the indoor unit's evaporator freezes, the refrigerant inside cannot be completely converted into gaseous refrigerant, and some liquid refrigerant will circulate back to the compressor, posing a risk of liquid return to the outdoor unit. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide an indoor unit, a non-communication air conditioning unit and its control method, and a readable storage medium to solve the problem in related technologies where the indoor unit of a non-communication air conditioning unit cannot send a shutdown signal to the outdoor unit when the indoor unit's evaporator is frosted, which poses a risk of liquid return to the outdoor unit.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] According to a first aspect of the present invention, an indoor unit is provided, connected to an outdoor unit via a thermostat, comprising:

[0007] A relay is installed on the line connecting the thermostat and the indoor unit. Its control terminal is connected to the main control board of the indoor unit. The main control board is connected to a temperature sensor for detecting the temperature of the evaporator tubes.

[0008] The main control board is used to control whether the thermostat is powered on via the relay based on the pipe temperature detected by the temperature sensor, thereby controlling the opening and closing of the indoor and outdoor units.

[0009] Preferably, the indoor unit further includes:

[0010] The indoor unit wiring board is used to connect the thermostat to the main control board.

[0011] A transformer is connected between the main control board and the indoor unit wiring board to convert the power supply voltage output by the main control board into the 24V AC working voltage of the thermostat.

[0012] The relay is connected between the secondary side of the transformer and the indoor unit terminal block.

[0013] According to a second aspect of the present invention, a communication-free air conditioning unit is provided, comprising:

[0014] The aforementioned indoor unit, outdoor unit, and thermostats connected to the indoor unit and outdoor unit respectively.

[0015] Preferably, the outdoor unit is equipped with an outdoor unit wiring board, and the thermostat is connected to the outdoor unit through the outdoor unit wiring board.

[0016] According to a third aspect of the present invention, a control method for a non-communication air conditioning unit is provided, comprising:

[0017] Detect the tube temperature of the evaporator;

[0018] Based on the pipe temperature, a relay controls whether the thermostat is powered on, thereby controlling the opening and closing of the indoor and outdoor units; the relay is installed on the line connecting the thermostat and the indoor unit, and its control terminal is connected to the main control board of the indoor unit.

[0019] Preferably, the step of controlling whether the temperature controller is powered on via a relay based on the pipe temperature includes:

[0020] If the pipe temperature is greater than the first threshold temperature, the relay remains in its current closed state, the thermostat is powered on, and the indoor and outdoor units operate normally.

[0021] If the pipe temperature is less than or equal to the second threshold temperature, the control relay is disconnected, the thermostat is de-energized, and both the indoor and outdoor units stop working simultaneously, provided that the first threshold temperature is greater than the second temperature threshold.

[0022] Preferably, the detection of the evaporator tube temperature specifically involves:

[0023] In cooling mode, the tube temperature of the evaporator is detected by a temperature sensor installed on the evaporator.

[0024] Preferably, the method further includes:

[0025] After power is restored and restarted, the machine will start and run according to the operating mode before the power failure, which is stored in the thermostat.

[0026] According to a fourth aspect of the present invention, an indoor unit is provided, comprising:

[0027] A processor, and a memory connected to the processor;

[0028] The memory is used to store computer programs;

[0029] The processor is used to call and execute the computer program in the memory to perform the above-described method.

[0030] According to a fifth aspect of the present invention, a non-transitory computer-readable storage medium is provided storing computer instructions for causing a computer to perform the methods described above.

[0031] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0032] By adding a relay to the indoor unit, the main control board can control the thermostat to power on based on the pipe temperature detected by the temperature sensor, thereby controlling the opening and closing of the indoor and outdoor units. This allows the outdoor unit to automatically shut down when the indoor unit is running under low load or when the evaporator frosts due to the cooling fan stopping, thus avoiding the problem of liquid return. This greatly improves the reliability and safety of the unit, reduces the failure rate caused by liquid return, and extends the service life of the unit. Attached Figure Description

[0033] Figure 1 This is an internal wiring diagram of an indoor unit according to an exemplary embodiment;

[0034] Figure 2 This is an internal wiring diagram of a non-communication air conditioning unit according to an exemplary embodiment;

[0035] Figure 3 This is a control method for a non-communication air conditioning unit according to an exemplary embodiment;

[0036] Figure 4 This is a control method for a non-communication air conditioning unit according to another exemplary embodiment. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0038] Example 1

[0039] Figure 1 This is an internal wiring diagram of an indoor unit 100 according to an exemplary embodiment, wherein the indoor unit 100 is connected to the outdoor unit via a thermostat, as shown below. Figure 1 As shown, the indoor unit 100 includes:

[0040] Relay 101 is installed on the line connecting the thermostat and the indoor unit. Its control terminal is connected to the main control board 102 of the indoor unit. The main control board 102 is connected to a temperature sensor 103 for detecting the temperature of the evaporator tube.

[0041] The main control board 102 is used to control whether the thermostat is powered on by the relay 101 based on the pipe temperature detected by the temperature sensor 103, thereby controlling the opening and closing of the indoor unit and the outdoor unit.

[0042] Understandably, in air conditioning units without communication capabilities, the indoor unit cannot send signals to the main control board to control the outdoor unit's on / off state. Therefore, when the indoor unit is operating at low load or the indoor fan stops during cooling, the indoor evaporator may frost over, preventing the signal to shut down the outdoor unit. The technical solution provided in this embodiment is applicable to indoor units of air conditioning units without communication capabilities. By improving the structure of the indoor unit, it enables simultaneous shutdown of both the indoor and outdoor units when the indoor evaporator frosts over.

[0043] It is understood that the technical solution provided in this embodiment, by adding a relay in the indoor unit, enables the main control board to control whether the thermostat is powered on based on the pipe temperature detected by the temperature sensor, thereby controlling the opening and closing of the indoor and outdoor units. This allows the outdoor unit to automatically shut down when the indoor unit is running under low load or when the evaporator frosts due to the cooling fan stopping, thus avoiding the problem of liquid return. This greatly improves the reliability and safety of the unit, reduces the failure rate caused by liquid return, and extends the service life of the unit.

[0044] See Figure 1 The indoor unit 100 further includes:

[0045] The indoor unit wiring board XT2 is used to connect the thermostat to the main control board 102.

[0046] Transformer TC is connected between the main control board 102 and the indoor unit terminal block XT2, and is used to convert the power supply voltage output by the main control board 102 into the 24V AC working voltage of the thermostat.

[0047] The relay 101 is connected between the secondary side of the transformer TC and the indoor unit terminal block XT2.

[0048] See Figure 1 The indoor unit wiring board XT2 has multiple wiring holes, including:

[0049] D: Socket for transmitting defrosting signals;

[0050] B: Signal connector for transmitting four-way valve signals;

[0051] W1: Electric heating signal connector;

[0052] R: 24V AC power supply socket;

[0053] C: 24V common terminal jack;

[0054] G: Indoor unit fan signal connector.

[0055] Relay 101 is connected between the secondary side of the transformer TC and the 24V AC power supply socket of the indoor unit terminal block XT2.

[0056] It is understood that in the technical solution provided in this embodiment, the 24V power supply of the thermostat is provided by the indoor unit transformer TC. The transformer TC is installed in the electrical box of the indoor unit. The indoor unit transformer TC provides 24V voltage to the thermostat, so that the thermostat can control the unit to turn on and off.

[0057] In summary, the technical solution provided in this embodiment, by adding a relay to the indoor unit, enables the main control board to control whether the thermostat is powered on based on the pipe temperature detected by the temperature sensor, thereby controlling the start and stop of the indoor and outdoor units. This allows the outdoor unit to automatically shut down when the indoor unit is operating under low load or when the evaporator frosts due to the cooling fan stopping, thus avoiding the problem of liquid return. This greatly improves the reliability and safety of the unit, reduces the failure rate caused by liquid return, and extends the service life of the unit.

[0058] Example 2

[0059] Figure 2 This is an internal wiring diagram of a non-communication air conditioning unit according to an exemplary embodiment, such as... Figure 2 As shown, the non-communication air conditioning unit includes:

[0060] The aforementioned indoor unit 100, outdoor unit 200, and thermostat 300 connected to the indoor unit 100 and outdoor unit 200 respectively.

[0061] Furthermore, an outdoor unit wiring board is provided inside the outdoor unit 200, and the thermostat 300 is connected to the outdoor unit 200 through the outdoor unit wiring board.

[0062] See Figure 1 The outdoor unit's wiring board has multiple plug holes, including:

[0063] Y: Compressor signal connector;

[0064] B: Signal connector for transmitting four-way valve signals;

[0065] D: Socket for transmitting defrosting signals;

[0066] R: 24V AC power supply socket;

[0067] C: 24V common terminal jack;

[0068] G: Indoor unit fan signal connector.

[0069] It should be noted that the connection method between the thermostat 300 and the indoor unit 100, and the connection method between the thermostat 300 and the outdoor unit 200, provided in this embodiment are not changed compared with the prior art. The only change is that a relay connected to the thermostat 300 is added inside the indoor unit 100.

[0070] It is understood that the technical solution provided in this embodiment, by adding a relay in the indoor unit, enables the main control board to control whether the thermostat is powered on based on the pipe temperature detected by the temperature sensor, thereby controlling the opening and closing of the indoor and outdoor units. This allows the outdoor unit to automatically shut down when the indoor unit is running under low load or when the evaporator frosts due to the cooling fan stopping, thus avoiding the problem of liquid return. This greatly improves the reliability and safety of the unit, reduces the failure rate caused by liquid return, and extends the service life of the unit.

[0071] Example 3

[0072] Figure 3 This is a flowchart illustrating a control method for a communication-free air conditioning unit according to an exemplary embodiment, such as... Figure 3 As shown, the method includes:

[0073] Step S11: Detect the tube temperature of the evaporator;

[0074] Step S12: Based on the pipe temperature, control the thermostat to power on via a relay, thereby controlling the opening and closing of the indoor and outdoor units; the relay is installed on the line connecting the thermostat and the indoor unit, and its control terminal is connected to the main control board of the indoor unit.

[0075] It should be noted that the technical solution provided in this embodiment is, in practice, loaded and runs on the main control board of the indoor unit, or loaded and runs on an electronic device connected to the main control board of the indoor unit.

[0076] In practice, step S11, which involves detecting the evaporator tube temperature, specifically involves:

[0077] In cooling mode, a temperature sensor (see [reference]) is used on the evaporator. Figure 1 The temperature sensing element 103 in the middle detects the tube temperature of the evaporator.

[0078] It is understood that the technical solution provided in this embodiment, by adding a relay in the indoor unit, enables the main control board to control whether the thermostat is powered on based on the pipe temperature detected by the temperature sensor, thereby controlling the opening and closing of the indoor and outdoor units. This allows the outdoor unit to automatically shut down when the indoor unit is running under low load or when the evaporator frosts due to the cooling fan stopping, thus avoiding the problem of liquid return. This greatly improves the reliability and safety of the unit, reduces the failure rate caused by liquid return, and extends the service life of the unit.

[0079] Preferably, step S12, which involves controlling the temperature controller to power on via a relay based on the pipe temperature, includes:

[0080] If the pipe temperature is greater than the first threshold temperature, the relay remains in its current closed state, the thermostat is powered on, and the indoor and outdoor units operate normally.

[0081] If the pipe temperature is less than or equal to the second threshold temperature, the control relay is disconnected, the thermostat is de-energized, and the indoor and outdoor units stop working simultaneously, where the first threshold temperature is greater than the second temperature threshold.

[0082] It should be noted that the first threshold temperature and the second temperature threshold can be the same or different. The first threshold temperature and the second temperature threshold are set based on historical experience values ​​or experimental data, and are generally set to be close to the average temperature value of the tube when the evaporator is frosted.

[0083] In practice, the method further includes:

[0084] After power is restored and restarted, the machine will start and run according to the operating mode before the power failure, which is stored in the thermostat.

[0085] It's understandable that thermostats have a memory function. Once the thermostat is set to the operating state, if the power is lost and then restored, it will retain the previously set operating state. For example, if the setting is for cooling, it will retain the signal to turn on cooling. This ensures that the unit maintains the previously set operating mode after power is restored, guaranteeing the continuity of the unit's operation and improving the user experience.

[0086] Assuming a non-communication air conditioning unit is set to start cooling operation via a thermostat, upon receiving the cooling start signal from the thermostat, the outdoor unit compressor, outdoor fan, and indoor unit begin operation. The indoor unit's evaporator temperature sensor detects the pipe temperature. When the indoor load is very low or the indoor fan stops, the cooling capacity generated by the evaporator cannot be dissipated in time, causing most of the refrigerant inside the evaporator to fail to evaporate, resulting in frost formation. At this time, the indoor unit's main control board receives the temperature detected by the temperature sensor. When the detected temperature is lower than the empirical value A, the main control board determines that the indoor evaporator has frozen. The main control board then sends a signal to a relay, causing the relay to activate and disconnect the 24V power supply to the indoor unit transformer. The thermostat is then de-energized, and the unit loses control and automatically shuts down. When the temperature detected by the indoor unit's temperature sensor is higher than the empirical value B (A and B can be the same or different, but B > A), the main control board sends a signal to the relay, causing the relay to activate and continue supplying 24V voltage to the thermostat. The thermostat is then energized and sends a restart signal to the unit, allowing the unit to start operating normally. This control method enables the non-communication air conditioning unit to achieve evaporator anti-freezing functionality.

[0087] In summary, the technical solution provided in this embodiment, by adding a relay to the indoor unit, enables the main control board to control whether the thermostat is powered on based on the pipe temperature detected by the temperature sensor, thereby controlling the start and stop of the indoor and outdoor units. This allows the outdoor unit to automatically shut down when the indoor unit is operating under low load or when the evaporator frosts due to the cooling fan stopping, thus avoiding the problem of liquid return. This greatly improves the reliability and safety of the unit, reduces the failure rate caused by liquid return, and extends the service life of the unit.

[0088] Example 4

[0089] Figure 4 This is a flowchart illustrating a control method for a communication-free air conditioning unit according to another exemplary embodiment, such as... Figure 4 As shown, the method includes:

[0090] Step S21: In cooling mode, the tube temperature of the evaporator is detected by a temperature sensor installed on the evaporator.

[0091] Step S22: If the pipe temperature is greater than the first threshold temperature, the relay is kept in its current closed state, the thermostat is powered on, and the indoor and outdoor units work normally.

[0092] Step S23: If the pipe temperature is less than or equal to the second threshold temperature, the control relay is disconnected, the thermostat is de-energized, and the indoor and outdoor units stop working simultaneously, where the first threshold temperature is greater than the second temperature threshold.

[0093] Step S24: After powering on again, start the machine according to the operating mode before the power failure, which is stored in the thermostat.

[0094] It should be noted that the technical solution provided in this embodiment is, in practice, loaded and runs on the main control board of the indoor unit, or loaded and runs on an electronic device connected to the main control board of the indoor unit.

[0095] It is understood that the technical solution provided in this embodiment, by adding a relay in the indoor unit, enables the main control board to control whether the thermostat is powered on based on the pipe temperature detected by the temperature sensor, thereby controlling the opening and closing of the indoor and outdoor units. This allows the outdoor unit to automatically shut down when the indoor unit is running under low load or when the evaporator frosts due to the cooling fan stopping, thus avoiding the problem of liquid return. This greatly improves the reliability and safety of the unit, reduces the failure rate caused by liquid return, and extends the service life of the unit.

[0096] Example 5

[0097] An indoor unit according to an exemplary embodiment includes:

[0098] A processor, and a memory connected to the processor;

[0099] The memory is used to store computer programs;

[0100] The processor is used to call and execute the computer program in the memory to perform the above-described method.

[0101] It is understood that the technical solution provided in this embodiment, by adding a relay in the indoor unit, enables the main control board to control whether the thermostat is powered on based on the pipe temperature detected by the temperature sensor, thereby controlling the opening and closing of the indoor and outdoor units. This allows the outdoor unit to automatically shut down when the indoor unit is running under low load or when the evaporator frosts due to the cooling fan stopping, thus avoiding the problem of liquid return. This greatly improves the reliability and safety of the unit, reduces the failure rate caused by liquid return, and extends the service life of the unit.

[0102] Example 6

[0103] An exemplary embodiment illustrates a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the methods described above.

[0104] It is understood that the technical solution provided in this embodiment, by adding a relay in the indoor unit, enables the main control board to control whether the thermostat is powered on based on the pipe temperature detected by the temperature sensor, thereby controlling the opening and closing of the indoor and outdoor units. This allows the outdoor unit to automatically shut down when the indoor unit is running under low load or when the evaporator frosts due to the cooling fan stopping, thus avoiding the problem of liquid return. This greatly improves the reliability and safety of the unit, reduces the failure rate caused by liquid return, and extends the service life of the unit.

[0105] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0106] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0107] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0108] If the integrated units in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0109] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0110] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0111] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0112] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0113] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A control method for a non-communication air conditioning unit, characterized in that, include: Detect the tube temperature of the evaporator; Based on the pipe temperature, a relay controls whether the thermostat is powered on, thereby controlling the opening and closing of the indoor and outdoor units; the relay is installed on the line connecting the thermostat and the indoor unit, and its control terminal is connected to the main control board of the indoor unit. The step of controlling whether the temperature controller is powered on via a relay based on the pipe temperature includes: If the pipe temperature is greater than the first threshold temperature, the relay remains in its current closed state, the thermostat is powered on, and the indoor and outdoor units operate normally. If the pipe temperature is less than or equal to the second threshold temperature, the control relay is disconnected, the thermostat is de-energized, and the indoor and outdoor units stop working simultaneously, where the first threshold temperature is greater than the second temperature threshold. When the indoor unit is operating under low load or when the evaporator frosts due to the cooling fan stopping, the outdoor unit is automatically shut down by controlling the relay to prevent liquid return.

2. The method according to claim 1, characterized in that, The method for detecting the tube temperature of the evaporator is as follows: In cooling mode, the tube temperature of the evaporator is detected by a temperature sensor installed on the evaporator.

3. The method according to claim 1, characterized in that, Also includes: After power is restored and restarted, the machine will start and run according to the operating mode before the power failure, which is stored in the thermostat.

4. An indoor unit, connected to an outdoor unit via a thermostat, characterized in that, The control method for a non-communication air conditioning unit according to any one of claims 1-3 includes: A relay is installed on the line connecting the thermostat and the indoor unit. Its control terminal is connected to the main control board of the indoor unit. The main control board is connected to a temperature sensor for detecting the temperature of the evaporator tubes. The main control board is used to control whether the thermostat is powered on by the relay based on the pipe temperature detected by the temperature sensor, thereby controlling the opening and closing of the indoor unit and the outdoor unit.

5. The indoor unit according to claim 4, characterized in that, Also includes: The indoor unit wiring board is used to connect the thermostat to the main control board. A transformer is connected between the main control board and the indoor unit wiring board to convert the power supply voltage output by the main control board into the 24V AC working voltage of the thermostat. The relay is connected between the secondary side of the transformer and the indoor unit terminal block.

6. A non-communication air conditioning unit, characterized in that, include: The indoor unit and outdoor unit as described in claim 4 or 5, and the thermostats respectively connected to the indoor unit and the outdoor unit.

7. The non-communication air conditioning unit according to claim 6, characterized in that, The outdoor unit is equipped with an outdoor unit wiring board, and the thermostat is connected to the outdoor unit through the outdoor unit wiring board.

8. An indoor unit, characterized in that, include: A processor, and a memory connected to the processor; The memory is used to store computer programs; The processor is used to call and execute the computer program in the memory to perform the method according to any one of claims 1 to 3.

9. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method according to any one of claims 1 to 3.

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