Air conditioning system

Abstract

The air conditioning system comprises a plurality of indoor units and an outdoor unit, and a compressor is arranged in the outdoor unit; the cut-off device is connected to the refrigerant pipeline between the indoor unit and the outdoor unit; the cut-off device is configured to close or open the refrigerant pipeline; the air conditioning system further comprises a power supply module which comprises a switching power supply and a standby power supply, and the input end of the switching power supply is electrically connected with the power supply. And the standby power supply is electrically connected with one output end of the switching power supply and is configured to supply power to the driving cut-off device when the power supply is disconnected. According to the air conditioning system provided by the invention, the standby power supply is arranged in the power supply module, so that the cut-off device can still work normally when the power supply is cut off; when the refrigerant leaks, the reliability and the safety of the air conditioning system can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioning system. Background Art

[0002] Refrigerants such as R32 used in air-conditioning systems have the characteristic of low flammability. If a leak occurs during use, an accident is likely to occur if the concentration is too high. Usually, a cut-off device is installed in the refrigerant pipeline. The cut-off device is configured to recover the refrigerant after leakage in the indoor unit and to cut off the refrigerant in the gas and liquid pipelines, thereby reducing the amount of refrigerant that spreads to the living space after leakage to reduce hidden dangers.

[0003] The cut-off device in the prior art operates automatically and does not require direct user involvement. When the refrigerant leaks, if the power is cut off, the cut-off device cannot be controlled to operate automatically, and the refrigerant will continue to leak and burn or explode when encountering an open flame, which poses a very serious safety hazard. Summary of the invention

[0004] One aspect of the present application provides an air conditioning system, including a plurality of indoor units and an outdoor unit, wherein a compressor is provided in the outdoor unit; further comprising a cut-off device, which is connected to a refrigerant pipeline between the indoor unit and the outdoor unit; the cut-off device is configured to close or conduct the refrigerant pipeline; the air conditioning system further comprises a power supply module, which includes a switching power supply and a backup power supply, wherein an input end of the switching power supply is electrically connected to the power supply. The backup power supply is electrically connected to one output end of the switching power supply, and the backup power supply is configured to supply power to drive the cut-off device to operate when the power supply is disconnected.

[0005] In one or more embodiments of the present application, the air-conditioning system also includes a main control chip, which is electrically connected to another output end of the switching power supply, and the main control chip is electrically connected to the cut-off device; the backup power supply is electrically connected to the main control chip; when the power supply is turned on, the power supply supplies power to the main control chip to drive the cut-off device to operate; when the power supply is disconnected, the backup power supply supplies power to the main control chip to drive the cut-off device to operate.

[0006] In one or more embodiments of the present application, the power supply module further includes: a voltage detection unit, which is configured to detect the real-time voltage of the backup power supply; and the voltage detection unit is electrically connected to the main control chip.

[0007] In one or more embodiments of the present application, the voltage detection unit includes: a first resistor and a second resistor; the first end of the first resistor is electrically connected to a backup power supply; the first end of the second resistor is electrically connected to the second end of the first resistor, and the other end is electrically connected to an input pin of the main control chip; the second end of the second resistor is grounded.

[0008] In one or more embodiments of the present application, the power supply module further includes: a step-down unit, an input end of the step-down unit is electrically connected to an output end of the switching power supply, and an output end of the step-down unit is connected to a backup power supply.

[0009] In one or more embodiments of the present application, a π-type filter circuit is provided between the switching power supply and the step-down unit.

[0010] In one or more embodiments of the present application, the step-down unit includes: a cement resistor; and a plurality of diodes connected in series; one end of the cement resistor is electrically connected to the output end of the switching power supply, and the other end is electrically connected to the positive electrode of one of the diodes, and the negative electrode of the diode is electrically connected to the backup power supply.

[0011] In one or more embodiments of the present application, the backup power source is a plurality of supercapacitors connected in series.

[0012] In one or more embodiments of the present application, the switching power supply includes: an AC power input live wire pin, which is electrically connected to the live wire of the power supply; an NTC resistor is arranged at the AC power input live wire pin; and an AC power input neutral wire pin, which is electrically connected to the neutral wire of the power supply; a film capacitor is arranged between the AC power input live wire pin and the AC power input neutral wire pin.

[0013] In one or more embodiments of the present application, the cut-off device includes: a first cut-off pipeline, which is connected to the first refrigerant pipeline between the indoor unit and the outdoor unit, and is configured to close or conduct the first refrigerant pipeline; a second cut-off pipeline, which is connected to the second refrigerant pipeline between the indoor unit and the outdoor unit, and is configured to close or conduct the second refrigerant pipeline.

[0014] Compared with the prior art, the advantages and positive effects of the utility model are:

[0015] The air-conditioning system provided in the present application is provided with a backup power supply in the power supply module to ensure that the cut-off device can still work normally when the power supply is disconnected; when a refrigerant leak occurs, the reliability and safety of the air-conditioning system can be guaranteed.

[0016] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 is a structural diagram of a cutting device according to some embodiments;

[0019] Figure 2 is a structural diagram of a first cut-off pipeline, a second cut-off pipeline, and a pressure relief pipeline according to some embodiments;

[0020] Figure 3 is another structural diagram of a first cut-off pipeline, a second cut-off pipeline, and a pressure relief pipeline according to some embodiments;

[0021] Figure 4 is a schematic diagram of the working principle of an air conditioning system according to some embodiments;

[0022] Figure 5 is a schematic diagram of the working principle of the air conditioning system during cooling according to some embodiments;

[0023] Figure 6 A schematic diagram of the working principle of an air conditioning system according to some embodiments when cooling and refrigerant leakage occurs indoors;

[0024] Figure 7 is a schematic structural diagram of a cutoff device in an air conditioning system according to some embodiments;

[0025] Figure 8 is a schematic structural diagram of a cutoff device in an air conditioning system according to some embodiments;

[0026] Fig. 9 is a schematic block diagram of a circuit principle of an air conditioning system according to some embodiments;

[0027] Fig.10 is a schematic block diagram of a circuit principle of an air conditioning system according to some embodiments;

[0028] Fig.11 is a schematic block diagram of a circuit principle of an air conditioning system according to some embodiments;

[0029] Fig.12 is a circuit diagram of an air conditioning system according to some embodiments;

[0030] Fig.13 is a circuit diagram of a voltage detection unit in an air conditioning system according to some embodiments;

[0031] In the figure: 10, indoor unit; 11, indoor heat exchanger; 12, indoor throttling device; 13, indoor fan; 20, outdoor unit; 21, outdoor heat exchanger; 22, outdoor throttling device; 23, outdoor fan; 24, compressor; 25, four-way valve; 26, liquid storage tank; 30, first refrigerant pipeline; 40, second refrigerant pipeline; 50, cut-off device; 60, power supply; 61, switching power supply; 62, backup power supply; 63, main control chip; 64, voltage detection unit; 65, step-down unit; 100, main body; 110, first cut-off pipeline; 112, first switch element; 113, first filter; 120, second cut-off pipeline; 122, second switch element; 123, second filter; 130, pressure relief pipeline; 131, pressure relief valve; 200, electrical box;

[0032] IC1P, switching power supply chip; ACL, AC power input live wire pin; ACN, AC power output neutral wire pin; NTC1P, NTC resistor; C1P, film capacitor; E1P, super capacitor; E2P, super capacitor; E3P, super capacitor; E4P, super capacitor; E5P, super capacitor; R5P, equalizing resistor; R6P, equalizing resistor; R7P, equalizing resistor; R8P, equalizing resistor; R9P, equalizing resistor; R39, first resistor; R43, second resistor; D5, clamping diode; D11, clamping diode; R3P, cement resistor; R4P, cement resistor; R10P, cement resistor; VD1P, step-down diode; VD2P, step-down diode; VD3P, step-down diode; VD4P, step-down diode; ZD10, voltage regulator diode. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly stipulated and limited, the first feature "above" or "below" the second feature may include the first and second features being directly released, or may include the first and second features being released not directly but through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0039] The present embodiment discloses an air conditioning system, including an outdoor unit 20 and one or more indoor units 10, and the air conditioning system performs a refrigeration cycle of the air conditioning system by using a compressor 24, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation to cool or heat the indoor space.

[0040] The low-temperature and low-pressure refrigerant enters the compressor 24, which compresses it into a high-temperature and high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0041] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor 24. The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioning system can adjust the temperature of the indoor space.

[0042] The outdoor unit 20 includes but is not limited to an outdoor heat exchanger 21, a compressor 24, an outdoor throttling device 22, an outdoor fan 23, a four-way valve 25, and a liquid storage tank 26; the indoor unit 10 includes but is not limited to an indoor heat exchanger 11, an indoor throttling device 12, and an indoor fan 13, etc.

[0043] The indoor heat exchanger 11 and the outdoor heat exchanger 21 function as a condenser or an evaporator. When the indoor heat exchanger 11 functions as a condenser, the air conditioning system functions as a heater in a heating mode, and when the indoor heat exchanger 11 functions as an evaporator, the air conditioning system functions as a cooler in a cooling mode.

[0044] The air conditioning system in this embodiment further includes a cut-off device 50, which is disposed between the indoor unit 10 and the outdoor unit 20, specifically between the indoor throttling device 12 and the outdoor throttling device 22. The indoor unit 10 and the outdoor unit 20 are connected to the inlet and outlet of the cut-off device 50 through a refrigerant pipeline. The cut-off device 50 can be installed between the outdoor unit 20 and the indoor unit 10 according to the site conditions, for example, it can be installed outside the indoor room, and of course it can also be installed indoors.

[0045] The cut-off device 50 includes a cut-off pipeline and a pressure relief pipeline 130. The cut-off pipeline is arranged on the refrigerant pipeline between the indoor unit 10 and the outdoor unit 20, and is configured to cut off or conduct the refrigerant pipeline to achieve the refrigerant cut-off function. The pressure relief pipeline 130 is configured to achieve the pressure relief protection function.

[0046] Specifically, refer to Figures 1 to 8 As shown, a first refrigerant pipeline 30 and a second refrigerant pipeline 40 are provided between the indoor unit 10 and the outdoor unit 20 , and are configured to transport refrigerant. The indoor throttling device 12 and the outdoor throttling device 22 are provided on the first refrigerant pipeline 30 .

[0047] The cut-off pipeline includes a first cut-off pipeline 110 and a second cut-off pipeline 120. The first cut-off pipeline 110 is connected to the first refrigerant pipeline 30 between the indoor unit 10 and the outdoor unit 20, and is configured to close or conduct the first refrigerant pipeline 30. Specifically, the first cut-off pipeline 110 is connected between the indoor heat exchanger 11 and the outdoor heat exchanger 21, or in other words, the first cut-off pipeline 110 is connected between the indoor throttling device 12 and the outdoor throttling device 22.

[0048] The first cutoff line 110 is turned on / off by the first switch 112. The first switch 112 is configured to control the first cutoff line 110 to be turned on or off.

[0049] In one or more embodiments of the present application, the first switch element 112 is a solenoid valve.

[0050] In one or more embodiments of the present application, the first switch element 112 is an electronic expansion valve.

[0051] In one or more embodiments of the present application, first filters 113 are respectively disposed at both ends of the first switch element 112 .

[0052] The second cutoff line 120 is connected to the second refrigerant line 40 between the indoor unit 10 and the outdoor unit 20 and is configured to close or open the second refrigerant line 40. Specifically, the second cutoff line 120 is connected between the indoor unit 10 and the compressor 24.

[0053] The second cut-off line 120 is turned on / off by the second switch 122. The second switch 122 is configured to control the first cut-off line 110 to be turned on or off.

[0054] In one or more embodiments of the present application, the second switch element 122 is a solenoid valve.

[0055] In one or more embodiments of the present application, the second switch element 122 is an electronic expansion valve.

[0056] In one or more embodiments of the present application, second filters 123 are respectively disposed at both ends of the second switch element 122 .

[0057] In one or more embodiments of the present application, one of the first cutoff line 110 and the second cutoff line 120 is closed and the other is opened, so that the refrigerant can be transported from one of the indoor unit 10 and the outdoor unit 20 to the other.

[0058] In one or more embodiments of the present application, a pressure relief pipeline 130 may be further provided in the cutoff device 50. The pressure relief pipeline 130 is connected between the first cutoff pipeline 110 and the second cutoff pipeline 120, and a pressure relief valve 131 is provided on the pressure relief pipeline 130. The pressure relief pipeline 130 is configured to guide the high-pressure refrigerant in the refrigerant pipeline between the indoor unit 10 and the outdoor unit 20 to the compressor 24 of the air-conditioning system to provide pressure relief protection for the air-conditioning system.

[0059] The first end of the pressure relief pipeline 130 is connected to the refrigerant pipeline between the first switch component 112 and the indoor unit 10 , that is, the first end of the pressure relief pipeline 130 is connected between the first switch component 112 and the indoor throttling device 12 .

[0060] The second end of the pressure relief line 130 is connected to the refrigerant line between the second switch element 122 and the outdoor unit 20 , that is, the second end of the pressure relief line 130 is connected between the second switch element 122 and the compressor 24 .

[0061] When the air conditioning system is cooling normally, the indoor unit 10 and the outdoor unit 20 operate normally, the first switch 112 and the second switch 122 are opened, the pressure relief valve 131 is closed, the first cut-off pipeline 110 and the second cut-off pipeline 120 are in a conducting state, the pressure relief pipeline 130 is closed, and the first refrigerant pipeline 30 and the second refrigerant pipeline 40 are conducting. The refrigerant flowing out of the compressor 24 flows through the outdoor heat exchanger 21, the outdoor throttling device 22, the first cut-off pipeline 110, the indoor throttling device 12, the indoor heat exchanger 11, the second cut-off pipeline 120, the liquid storage tank 26 and the compressor 24 in sequence, completing a circulation flow.

[0062] In the cooling state, the indoor unit 10 leaks, the first switch 112 is closed, the first shut-off line 110 is shut off, and the refrigerant is blocked from continuing to flow to the indoor unit 10 side, the pressure relief valve 131 is closed, the pressure relief line 130 is closed, the second switch 122 is opened, and the second shut-off line 120 is connected, the compressor 24 continues to run, and the refrigerant on the indoor unit 10 side is sucked into the compressor 24, compressed and recovered and stored on the outdoor unit 20 side; the first shut-off line 110 and the second shut-off line 120 are closed, the compressor 24 stops working, and the refrigerant leakage fault is notified and waited for.

[0063] When the air conditioning system is heating normally, the indoor unit 10 and the outdoor unit 20 operate normally, the first switch 112 and the second switch 122 are opened, the pressure relief valve 131 is closed, the first cut-off line 110 and the second cut-off line 120 are in a conducting state, the pressure relief line 130 is closed, and the first refrigerant line 30 and the second refrigerant line 40 are conducting. The refrigerant flowing out of the compressor 24 flows through the second cut-off line 120, the indoor heat exchanger 11, the indoor throttling device 12, the first cut-off line 110, the outdoor throttling device 22, the outdoor heat exchanger 21, the liquid storage tank 26 and the compressor 24 in sequence, completing a circulation flow.

[0064] In the heating state, the indoor unit 10 leaks, the second switch 122 is closed, the second shut-off line 120 is shut off, and the refrigerant is blocked from continuing to flow to the indoor unit 10 side, the pressure relief valve 131 is closed, the pressure relief line 130 is closed, the first switch 112 is opened, the first shut-off line 110 is connected, the compressor 24 is running, the refrigerant on the indoor unit 10 side is sucked into the compressor 24, compressed and recovered and stored in the outdoor unit 20, the first shut-off line 110 and the second shut-off line 120 are closed, the compressor 24 stops working, and the refrigerant leakage fault is notified and waited for.

[0065] When the pressure relief valve 131 is opened, the high-pressure end can be protected from pressure relief, and the high-pressure refrigerant can flow to the compressor 24 through the pressure relief pipeline 130, thereby protecting the system pipeline and preventing refrigerant leakage.

[0066] In one or more embodiments of the present application, the pressure relief valve 131 is a solenoid valve.

[0067] In one or more embodiments of the present application, the pressure relief valve 131 is an electronic expansion valve.

[0068] like Figures 9 to 13 As shown, in one or more embodiments of the present application, the air conditioning system further includes a power supply module. The power supply module includes a switching power supply 61. The input end of the switching power supply 61 is electrically connected to the power supply 60. A backup power supply 62 is also provided in the power supply module, and the backup power supply 62 is electrically connected to one output end of the switching power supply 61. The backup power supply 62 is configured to supply power to drive the cutoff device to operate when the power supply is disconnected.

[0069] The air-conditioning system provided in the present application is provided with a backup power supply 62 in the power supply module to ensure that the cut-off device can still work normally when the power supply is disconnected; when a refrigerant leak occurs, the reliability and safety of the air-conditioning system can be guaranteed.

[0070] like Figures 9 to 13As shown, in one or more embodiments of the present application, the air conditioning system further includes a main control chip 63. The main control chip 63 is electrically connected to another output end of the switch power supply 61. The main control chip 63 is electrically connected to the cutoff device 50. The backup power supply 62 is electrically connected to the main control chip 63.

[0071] In one or more embodiments of the present application, when the power supply 60 is turned on, the power supply 60 supplies power to the main control chip 63 to drive the cutoff device 50 to operate. When the power supply 60 is turned off, the backup power supply 62 supplies power to the main control chip 63 to drive the cutoff device 50 to operate.

[0072] In one or more embodiments of the present application, the power supply 60 may be an AC power supply, such as a mains power supply, or a DC power supply, such as power from a generator or photovoltaic power supply.

[0073] In one or more embodiments of the present application, the switching power supply 61 is a switching power supply chip IC1P. The switching power supply 61 receives an input voltage from the power supply 60, converts the input voltage into a desired DC voltage through a built-in switching element and rectifier current in the switching power supply chip IC1P, and removes high-frequency ripples therein. The switching power supply chip IC1P can be a commercially available switching power supply chip IC1P, and its manufacturer and model are not limited here.

[0074] In one or more embodiments of the present application, the DC voltage output by the switching power supply 61 is 15V.

[0075] In one or more embodiments of the present application, the DC voltage output by the switching power supply 61 is 12V.

[0076] In one or more embodiments of the present application, corresponding to the AC power supply 60, the switching power supply 61 includes an AC power input live wire pin ACL and an AC power input neutral wire pin ACN. The AC power input live wire pin ACL is electrically connected to the live wire of the power supply 60, and an NTC resistor is provided at the AC power input live wire pin ACL, such as Fig.12 As shown in NTC1P in the figure, overshoot is suppressed when power is turned on. The AC power input neutral line pin ACN is electrically connected to the neutral line of the power supply 60. A film capacitor C1P is provided between the AC power input live line pin ACL and the AC input neutral line pin. The film capacitor C1P is used to improve electromagnetic compatibility.

[0077] In one or more embodiments of the present application, the main control chip 63 may be disposed in the indoor unit 10, for example, a control chip of an indoor controller may be selected.

[0078] In one or more embodiments of the present application, the main control chip 63 may be disposed in the outdoor unit 20, for example, a control chip of an outdoor controller may be selected.

[0079] In one or more embodiments of the present application, the main control chip 63 may be an independent MCU disposed in the electrical box 200 of the cutoff device 50, and the MCU may be connected to the control chip of the indoor controller and / or the controller of the outdoor controller. The electrical box 200 is independently disposed in the main body 100 of the cutoff device 50.

[0080] In one or more embodiments of the present application, the output port of the main control chip 63 is connected to the drive circuit. The drive circuit connects the first switch 112, the second switch 122 and the coil of the pressure relief valve 131. Exemplarily, the output port of the main control chip 63 outputs a high-level signal to the drive circuit, and the drive circuit provides a sufficiently large current to the coil of the solenoid valve so that the solenoid valve is opened; or the output port of the main control chip 63 outputs a low-level signal to cut off the current of the solenoid valve coil, and the solenoid valve will be closed due to the internal structure (such as the restoring force of the spring). The drive circuit includes at least one power electronic device. For example, a triode or a field effect transistor, the drive circuit is used to amplify the output signal of the main control chip 63 to provide a sufficiently large current to the coil of the solenoid valve. The specific circuit of the drive circuit is not limited here, and the drive circuit also includes protection elements, such as diodes and resistors, to avoid damage to electrical components by reverse current or voltage peaks.

[0081] In one or more embodiments of the present application, the output port of the main control chip 63 is connected to the drive circuit. The drive circuit is connected to the coil of the relay, and the contacts of the relay are connected to the power supply circuit of the first switch 112, the second switch 122 and the pressure relief valve 131. Exemplarily, the output port of the main control chip 63 outputs a high-level signal to the drive circuit, the drive circuit energizes the coil of the relay, closes the contacts, and conducts the power supply circuit of the first switch 112, the second switch 122 and the pressure relief valve 131; or the output port of the main control chip 63 outputs a low-level signal to the drive circuit, the drive circuit de-energizes the coil of the relay, opens the contacts, and cuts off the power supply circuit of the first switch 112, the second switch 122 and the pressure relief valve 131.

[0082] In one or more embodiments of the present application, when the power supply 60 is turned on, the backup power supply 62 is charged through the switching power supply 61. When the power supply 60 is disconnected, if refrigerant leakage occurs at this time, the backup power supply 62 supplies power to the main control chip 63 to ensure that the output port of the main control chip 63 can output signals normally, so as to ensure that the first switch element 112, the second switch element 122 and the pressure relief valve 131 can still operate normally.

[0083] In one or more embodiments of the present application, the backup power source 62 is a plurality of supercapacitors connected in series.

[0084] In one or more embodiments of the present application, the charging voltage of the backup power supply 62 is 12V.

[0085] In one or more embodiments of the present application, the minimum charging voltage of the backup power supply 62 can be set according to the selection of the relay, the solenoid valve or the electronic expansion valve.

[0086] In one or more embodiments of the present application, the number of supercapacitors in the backup power supply 62 can be set according to the lowest charging voltage of the backup power supply 62 .

[0087] For example, in one or more embodiments of the present application, the backup power supply 62 includes five supercapacitors connected in series, such as Fig.12 When multiple supercapacitors are connected in series, the voltage distribution on each supercapacitor may be uneven. During the charging or discharging process, the leakage current of some supercapacitors may be large, and the voltage of these supercapacitors may exceed their rated voltage, causing damage to the supercapacitors. To solve this problem, each supercapacitor is equipped with a voltage-equalizing resistor, such as Fig.12 As shown in R5P, R6P, R7P, R8P and R9P, the voltage-equalizing resistor can balance the voltage distribution between the supercapacitors in series to prevent overvoltage of a single supercapacitor. The resistance value of the voltage-equalizing resistor can be set according to the maximum capacitor leakage current provided in the supercapacitor manufacturer's specification sheet. The voltage-equalizing resistor is preferably a chip resistor.

[0088] In one or more embodiments of the present application, the power supply module further includes a voltage detection unit 64. The voltage detection unit 64 is configured to detect the real-time voltage of the backup power supply 62, and the voltage detection unit 64 is electrically connected to the main control chip 63. The voltage detection unit 64 is used to detect the real-time voltage of the backup power supply 62 to ensure that the backup power supply 62 can work normally.

[0089] In one or more embodiments of the present application, the voltage detection unit 64 includes a first resistor R39 and a second resistor R43. The first end of the first resistor R39 is electrically connected to the backup power supply 62, the first end of the second resistor R43 is electrically connected to the second end of the first resistor R39, the first end of the second resistor R43 is electrically connected to an input pin 12V-check of the main control chip 63, and the second end of the second resistor R43 is grounded. The main control chip 63 can obtain the voltage across the second resistor R43. The voltage detection unit 64 may also include clamping diodes D5 and D11.

[0090] In one or more embodiments of the present application, the power supply module further includes a step-down unit 65 . The input end of the step-down unit 65 is electrically connected to the output end of the switching power supply 61 , and the output end of the step-down unit 65 is connected to the backup power supply 62 .

[0091] When the output voltage of the switching power supply 61 is 15V, the voltage-reducing unit 65 is used to convert the output voltage into a charging voltage suitable for charging the supercapacitor.

[0092] In one or more embodiments of the present application, the voltage reducing unit 65 includes a cement resistor and a plurality of diodes connected in series. One end of the cement resistor is electrically connected to the output end of the switching power supply 61, the other end is electrically connected to the positive electrode of the first diode, and the negative electrode of the last diode is electrically connected to the backup power supply 62.

[0093] In one or more embodiments of the present application, a π-type filter circuit is provided between the switching power supply 61 and the step-down unit 65. The π-type filter circuit can effectively suppress the ripple in the output voltage of the switching power supply 61, and can match the impedance of the switching power supply 61 and the super capacitor, thereby improving the energy transmission efficiency and providing sufficient charging current to the super capacitor at the subsequent stage. Fig.12 As shown, the π-type filter circuit includes a topology consisting of a capacitor E6P, an inductor L2P and a capacitor E7P.

[0094] like Fig.12 As shown, in one or more embodiments of the present application, the cement resistor includes cement resistors R3P, R4P and R10P connected in parallel, and the three parallel cement resistors are used to limit the charging current of the supercapacitor. Taking the output of the switching power supply 61 as 15V as an example, four series-connected step-down diodes VD1P, VD2P, VD3P and VD4P are used to step down the voltage until it is reduced to +12V, the positive electrode of VD1P is electrically connected to the parallel cement resistor, the negative electrode of VD1P is connected to the positive electrode of VD2P, the negative electrode of VD2P is connected to the positive electrode of VD3P, the negative electrode of VD3P is connected to the positive electrode of VD4P, and VD4P is electrically connected to the power supply terminal VCC of the supercapacitor. A voltage regulator diode ZD10 is provided between the diodes VD2P and VD3P to limit the surge voltage.

[0095] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by technicians familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. Air conditioning system, including: Several indoor units; an outdoor unit in which a compressor is disposed; A cut-off device connected to the refrigerant pipeline between the indoor unit and the outdoor unit; The cut-off device is configured to close or open the refrigerant pipeline; It is characterized by further comprising: A power supply module, comprising: A switching power supply having an input terminal electrically connected to a power supply; and A backup power supply is electrically connected to one output terminal of the switching power supply; the backup power supply is configured to supply power to drive the cutoff device to operate when the power supply is disconnected.

2. The air conditioning system according to claim 1, characterized in that: Also includes: A main control chip, which is electrically connected to another output end of the switching power supply, and the main control chip is electrically connected to the cutoff device; The backup power supply is electrically connected to the main control chip; When the power supply is turned on, the power supply supplies power to the main control chip to drive the cutoff device to operate; When the power supply is disconnected, the backup power supply supplies power to the main control chip to drive the cutoff device to operate.

3. The air conditioning system according to claim 2, characterized in that: The power supply module also includes: A voltage detection unit is configured to detect the real-time voltage of the backup power supply; the voltage detection unit is electrically connected to the main control chip.

4. The air conditioning system according to claim 3, characterized in that: The voltage detection unit comprises: a first resistor, a first end of the first resistor being electrically connected to the backup power supply; and A second resistor, wherein a first end of the second resistor is electrically connected to a second end of the first resistor, and another end of the second resistor is electrically connected to an input pin of the main control chip; and a second end of the second resistor is grounded.

5. The air conditioning system according to claim 2, characterized in that: The power supply module also includes: A step-down unit, wherein the input end of the step-down unit is electrically connected to the output end of the switching power supply, and the output end of the step-down unit is connected to the backup power supply.

6. The air conditioning system according to claim 5, characterized in that: A π-type filter circuit is provided between the switching power supply and the voltage step-down unit.

7. The air conditioning system according to claim 5, characterized in that: The voltage reduction unit comprises: Cement resistors; and A plurality of diodes connected in series; One end of the cement resistor is electrically connected to the output end of the switching power supply, and the other end is electrically connected to the positive electrode of one of the diodes, and the negative electrode of the diode is electrically connected to the backup power supply.

8. The air conditioning system according to any one of claims 1 to 7, characterized in that: The backup power source is a plurality of supercapacitors connected in series.

9. The air conditioning system according to any one of claims 1 to 7, characterized in that: The switching power supply comprises: An AC power input live wire pin, which is electrically connected to the live wire of the power supply; an NTC resistor is provided at the AC power input live wire pin; and An AC power input neutral pin, which is electrically connected to the neutral line of the power supply; A film capacitor is arranged between the AC power input live wire pin and the AC power input neutral wire pin.

10. The air conditioning system according to any one of claims 1 to 7, characterized in that: The cutting device comprises: A first cut-off pipeline, connected to the first refrigerant pipeline between the indoor unit and the outdoor unit, and configured to close or conduct the first refrigerant pipeline; The second cut-off pipeline is connected to the second refrigerant pipeline between the indoor unit and the outdoor unit, and is configured to close or conduct the second refrigerant pipeline.

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