Air conditioner

Abstract

The air conditioner comprises an outdoor unit, and the outdoor unit comprises a compressor, a low-voltage direct-current power source, a drive control module, a pressure switch, a signal acquisition module and a control module; the driving control module is connected with the compressor and controls the compressor to operate according to a given rotating speed; the low-voltage direct-current power supply is connected with the driving control module through the pressure switch; when the pressure switch is closed, the low-voltage direct-current power supply supplies power to the driving control module; when the pressure switch is switched off, the low-voltage direct-current power supply is disconnected from the driving control module; the signal acquisition module is connected with the pressure switch and is used for acquiring an opening signal or a closing signal of the pressure switch; the control module is in communication connection with the driving control module, is connected with the signal acquisition module, receives the disconnection signal or the connection signal, and outputs a shutdown signal to the driving control module when receiving the disconnection signal; and the driving control module controls the compressor to stop according to the stop signal. The compressor can stop reliably in real time when high pressure is abnormal, and the damage probability of parts is reduced.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically to an air conditioner. Background Technology

[0002] Commercial multi-split air conditioning systems have complex piping, and the unpredictable load changes of indoor units can easily lead to unstable or uneven refrigerant pressure. Therefore, protecting the system pressure is crucial for commercial multi-split air conditioning systems, requiring not only high timeliness and reliability but also high effectiveness.

[0003] In commercial multi-split air conditioning systems, pressure switches are used to detect refrigerant line pressure and protect the refrigerant system from damage due to excessive refrigerant pressure. The existing solution involves connecting the pressure switch to the main control circuit; when the pressure switch activates, a signal is transmitted to the main control module; the main control module then issues a shutdown command, stopping the compressor and thus halting the pressure rise.

[0004] However, the high pressure in commercial multi-split air conditioning systems rises rapidly. Using the main control module to control the compressor shutdown takes a long time, resulting in a slow pressure source cutoff and potential damage to components due to delayed protection. Furthermore, when the main control module sends control signals based on pressure switch signals to shut down the compressor and protect against high pressure, there are numerous intermediate components involved in signal acquisition and control signal transmission, leading to a high cumulative failure rate and poor reliability.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0006] To address the issue of low timeliness and reliability in the main control module's control of the compressor to stop and protect against high pressure based on the action of the pressure switch, as mentioned in the background technology, this invention proposes an air conditioner in which the pressure switch directly controls the compressor to stop via hardware, thereby improving the timeliness and reliability of high pressure protection and reducing the probability of damage to system components.

[0007] To achieve the above-mentioned objectives, the present invention employs the following technical solution: An air conditioner includes an outdoor unit, which includes a compressor, a low-voltage DC power supply, a drive control module, a pressure switch, a signal acquisition module, and a first control module. The compressor drives the refrigerant circulation system; The low-voltage DC power supply is used to output low-voltage DC power; The drive control module is connected to the compressor and controls the compressor to operate at a given speed. The pressure switch is installed on the high-pressure pipeline of the refrigerant circulation system, and its two ends are respectively connected to the low-voltage DC power supply and the drive control module. It opens when the pressure exceeds the preset value and closes when the pressure is lower than the preset value. When the pressure switch is closed, the low-voltage DC power supply supplies power to the drive control module. When the pressure switch is open, the low-voltage DC power supply is disconnected from the drive control module. The signal acquisition module is connected to the pressure switch and is used to acquire the open or closed signal of the pressure switch. The first control module is communicatively connected to the drive control module and the signal acquisition module, respectively, receives the disconnect signal or the closed signal, and outputs a stop signal to the drive control module when the disconnect signal is received; the drive control module controls the compressor to stop according to the stop signal.

[0008] In some specific embodiments, at least one indoor unit is also included; The first control module is the main control module, which is communicatively connected to the indoor unit and outputs the given speed to the drive control module according to the operating load of the indoor unit.

[0009] In some specific embodiments, the first control module has a preset first duration and a preset second duration; The first control module is configured to start timing when it receives the disconnect signal; if it receives the closure signal when the timing time is within the first set duration, it continues timing, and outputs a start signal to the drive control module when the timing time reaches the second set duration; after receiving the start signal, the drive control module controls the compressor to retry starting.

[0010] Limiting the voltage reduction time and delaying the retry startup time ensures system security while extending runtime and improving user experience.

[0011] In some specific embodiments, the first control module has a preset third set duration and a loop count threshold, and is configured to start timing after outputting the start signal to the drive control module; if the disconnect signal is received again within the third set duration, the timing is restarted and the start is retried after the timing reaches the second set duration; if the number of retry starts reaches the loop count threshold, the retry start is stopped and the retry start is marked as failed.

[0012] While increasing the operating time of the air conditioner during high-pressure abnormalities, it also ensures the safety of the system's operation and prevents false alarms.

[0013] In some specific embodiments, the first control module is configured to trigger a high-pressure alarm when it receives the disconnection signal, and is also configured to trigger a pressure switch fault alarm if it does not receive the closing signal within a first set time period after receiving the disconnection signal, and to trigger a system fault alarm if the retry start fails.

[0014] By issuing different types of alarms for different situations, users and maintenance personnel can understand the operating status of the air conditioner and locate the fault, thereby improving maintenance efficiency.

[0015] In some specific embodiments, the first control module is further configured to continue outputting the shutdown signal when the timing time reaches the second set duration after receiving shutdown signals, temperature-limited shutdown signals, or fault signals from all the indoor units before the timing time reaches the second set duration.

[0016] An air conditioner includes an outdoor unit, which includes a compressor, a low-voltage DC power supply, a drive module, a pressure switch, a signal acquisition module, and a second control module. The compressor drives the refrigerant circulation system; The low-voltage DC power supply is used to output low-voltage DC power; The drive module is connected to the compressor and is used to output compressor drive power. The pressure switch is installed on the high-pressure pipeline of the refrigerant circulation system, and its two ends are respectively connected to the low-voltage DC power supply and the drive control module. It opens when the pressure exceeds the preset value and closes when the pressure is lower than the preset value. When the pressure switch is closed, the low-voltage DC power supply supplies power to the drive control module. When the pressure switch is open, the low-voltage DC power supply is disconnected from the drive control module. The signal acquisition module is connected to the pressure switch and is used to detect the open or closed signal of the pressure switch. The second control module is connected to the drive module and the signal acquisition module respectively, receives the disconnect signal or the closed signal, and outputs a stop signal to the drive module when the disconnect signal is received; the drive module controls the compressor to stop according to the stop signal.

[0017] In some specific embodiments, the second control module is preset with a first set duration and a second set duration; The second control module is configured to start timing when the disconnect signal is received; if the closing signal is received within the first set time period, timing continues; and when the timing period reaches the second set time period, a start signal is output to the drive module to control the compressor to retry starting.

[0018] Limiting the voltage reduction time and delaying the retry startup time ensures system security while extending runtime and improving user experience.

[0019] In some specific embodiments, the second control module has a preset third set duration and a loop count threshold, and is configured to start timing when outputting the start signal to the drive module; if the disconnect signal is received again within the third set duration, the timing is restarted and the start is retried after the timing reaches the second set duration; if the number of retry starts reaches the loop count threshold, the retry start is stopped and the retry start is marked as failed.

[0020] Increase the operating time of the air conditioner when a high-pressure abnormality occurs; ensure system safety while preventing false alarms.

[0021] In some specific embodiments, at least one indoor unit is also included; the outdoor unit further includes a main control module, which is communicatively connected to the indoor unit and to the second control module, and outputs a given speed to the second control module according to the starting load of each indoor unit; the second control module controls the drive module to output compressor drive power according to the given speed. The second control module is configured to output a high-voltage alarm signal and a system fault alarm signal to the main control module when it receives the disconnection signal and the retry startup fails; the main control module then performs the high-voltage alarm and system fault alarm.

[0022] By issuing different types of alarms for different situations, users and maintenance personnel can understand the operating status of the air conditioner and locate the fault, thereby improving maintenance efficiency.

[0023] The air conditioner of this invention directly controls the power supply or de-energization of the drive control module or drive module by opening and closing a pressure switch. The opening and closing of the pressure switch is synchronized with whether the system high pressure value reaches a preset threshold. That is, as long as the system high pressure exceeds the preset threshold, or the preset threshold approaches the dangerous value of the system high pressure, the pressure switch opens, and the drive control module or drive module is de-energized. The drive control module or drive module cannot operate, causing the compressor to stop. When the system high pressure reaches the preset threshold, it is linked to the opening of the pressure switch. The opening of the pressure switch directly controls the power supply or de-energization of the drive control module or drive module without transmission delay, so that the system high pressure reaches the preset threshold and the compressor stops operating without delay. This timely and rapid action prevents the system high pressure from continuing to rise, improves system safety, reduces the probability of component damage, and reduces the maintenance and repair costs of the air conditioner.

[0024] In addition, when the signal acquisition module transmits the acquired disconnection signal to the first control module or the second control module, the first control module or the second control module determines that the system high pressure has exceeded the preset threshold and is in a dangerous range based on the disconnection signal. Then, it outputs a shutdown signal to the drive control module or the drive module, and the software controls the compressor to shut down. Combined with the above hardware implementation, when the system high pressure reaches the preset threshold, the compressor is controlled to shut down by both hardware and software paths, which improves the timeliness, reliability and effectiveness of shutdown, reduces the probability of component damage, and thus reduces the maintenance and repair costs of the air conditioner.

[0025] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the control connection structure according to an embodiment; Figure 2 This is a schematic diagram of the control connection structure according to an embodiment; Figure 3 This is a schematic diagram of the control connection structure according to an embodiment; Figure 4 This is a schematic diagram of the control connection structure according to an embodiment; Figure 5 This is a schematic diagram of the control connection structure according to an embodiment; Figure 6 This is a schematic diagram of the control flow according to an embodiment; Figure 7 This is a schematic diagram of the control flow according to an embodiment; Figure 8 This is a schematic diagram of the control flow according to an embodiment; Figure 9 This is a schematic diagram of the control flow according to an embodiment; Figure 10 This is a schematic diagram of the control flow according to an embodiment.

[0028] Figure label, 1. Compressor; 2. Low-voltage DC power supply; 3. Drive control module; 4. Signal acquisition module; 5. First control module; 6. Indoor unit; 7. Main control module; 8. Second rectifier module; 9. Ripple module; 10. Wired controller; 21. First rectifier module; 22. Switching power supply module; 31. Drive module; 32. Second control module; K. Pressure switch. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0035] Air Conditioner Working Principle Air conditioners execute a refrigeration cycle using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle involves a series of processes, including compression, condensation, expansion, and evaporation, to cool or heat an indoor space.

[0036] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, 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.

[0037] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0038] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0039] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0040] [This Invention] Reference Figure 1 , Figure 6 The present invention discloses an air conditioner, which includes an outdoor unit; the outdoor unit includes a compressor 1, which is a variable frequency compressor 1 with controllable operating speed.

[0041] The outdoor unit also includes a low-voltage DC power supply 2, which is used to output low-voltage DC power to power low-voltage electrical components. It can obtain AC power through the first rectifier module 21 and the switching power supply module 22.

[0042] The outdoor unit also includes a drive control module 3, which is connected to the compressor 1 and controls the compressor 1 to operate at a given speed. Specifically, the drive control module 3 is connected to the DC bus and controls the timing of the connection between the DC bus and the compressor 1 based on the received speed signal, thereby controlling the voltage and current supplied to the compressor 1 and thus controlling the speed of the compressor 1. The drive control module 3 includes a microcontroller containing a central processing unit, an inverter circuit, and a drive circuit for driving the inverter circuit.

[0043] The outdoor unit also includes a pressure switch K; the low-voltage DC power supply 2 is connected to the drive control module 3 via the pressure switch K. The opening or closing of the pressure switch K either de-energizes or supplies power to the drive control module 3. The pressure switch K is installed on the system's high-pressure pipeline to detect the system's high pressure. It opens when the system high pressure exceeds its preset threshold and closes when it falls below the preset threshold. Specifically, when the system high pressure is lower than the preset threshold, the pressure switch K closes, and the low-voltage DC power supply 2 supplies power to the drive control module 3; when the system high pressure is higher than the preset threshold, the pressure switch K opens, and the low-voltage DC power supply 2 disconnects from the drive control module 3; that is, the drive control module 3 is de-energized and cannot provide drive power to the compressor 1, so the compressor 1 stops.

[0044] The outdoor unit also includes a signal acquisition module 4, which is connected to the pressure switch K and is used to acquire the open or closed signal of the pressure switch K.

[0045] The open or closed signal of pressure switch K can be obtained by the signal acquisition module 4 by detecting the voltage or current signal of the resistor connected in series with pressure switch K.

[0046] Specifically, when pressure switch K is closed, there is a supply current in the power supply lines of low-voltage DC power supply 2, pressure switch K, and drive control module 3, so the closing signal is a relatively strong voltage signal or a relatively strong current signal; when pressure switch K is open, the supply current in the power supply lines of low-voltage DC power supply 2, pressure switch K, and drive control module 3 is zero or close to zero, so the opening signal is a relatively weak voltage signal or a relatively weak current signal.

[0047] The outdoor unit also includes a first control module 5, which is connected to the drive control module 3 and the signal acquisition module 4 respectively. It receives the disconnection signal or the closing signal acquired by the signal acquisition module 4, and outputs a stop signal to the drive control module 3 when it receives the disconnection signal. The drive control module 3 controls the compressor 1 to stop according to the stop signal.

[0048] The air conditioner of this invention directly controls the power supply or de-energization of the drive control module 3 by opening and closing the pressure switch K. The opening and closing of the pressure switch K is synchronized with whether the system high pressure value reaches a preset threshold. That is, as long as the system high pressure exceeds the preset threshold, and the preset threshold is close to the dangerous value of the system high pressure, the pressure switch K will open, and the drive control module 3 will be de-energized. The drive control module 3 will be unable to operate, causing the compressor 1 to stop. When the system high pressure reaches the preset threshold, it will be linked to the disconnection of the pressure switch K. The opening of the pressure switch K directly controls the power supply or de-energization of the drive control module 3 without any transmission delay. This ensures that the system high pressure reaches the preset threshold and the compressor 1 stops operating without any delay, thus promptly and quickly preventing the system high pressure from continuing to rise, improving system safety, reducing the probability of component damage, and reducing the maintenance and repair costs of the air conditioner.

[0049] In addition, when the signal acquisition module 4 transmits the acquired disconnection signal to the first control module 5, the first control module 5 determines that the system high pressure has exceeded the preset threshold and is in a dangerous range based on the disconnection signal. Then, it outputs a shutdown signal to the drive control module 3, and the software controls the compressor 1 to shut down. Combined with the above hardware implementation, when the system high pressure reaches the preset threshold, the compressor 1 is controlled to shut down by both hardware and software paths, which improves the timeliness, reliability and effectiveness of shutdown, reduces the probability of component damage, and thus reduces the maintenance and repair costs of the air conditioner.

[0050] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 5 The first control module 5 is the outdoor main control module 7, which includes a microcontroller, such as a single-chip microcomputer.

[0051] The air conditioner also includes at least one indoor unit 6; the first control module 5 is communicatively connected to the indoor unit 6, and obtains the operating frequency or speed of the compressor 1 based on the total operating load of the indoor unit 6 and transmits it to the drive control module 3; the drive control module 3 controls the timing of the connection between the DC bus and the compressor 1 based on the received operating frequency or speed of the compressor 1, thereby controlling the voltage and current of the compressor 1. The DC bus is AC power obtained through the second rectifier module 8 and the ripple module 9.

[0052] That is, when the air conditioner includes multiple indoor units 6, some indoor units 6 are turned on and some indoor units 6 are turned off; the required cooling capacity is obtained based on the total capacity of the indoor units 6 that are turned on and the difference between their set temperature and the indoor temperature; the operating frequency or operating speed of the compressor 1 is calculated based on the required cooling capacity.

[0053] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 The first control module 5 is preset with a first set duration and a second set duration S1; the first set duration is less than the second set duration.

[0054] The first control module 5 is configured to receive signals collected by the signal acquisition module 4, and when the received signal is a disconnect signal, it outputs a stop signal to the drive control module 3 and starts timing S3; it continues to receive signals collected by the signal acquisition module 4; if a closing signal is received before the timing duration reaches the first set duration, it executes to continue timing S5; when the timing duration reaches the second set duration, it executes to output a start signal to the drive control module 3; when the drive control module 3 receives the start signal, it controls the compressor 1 to retry starting S7.

[0055] That is, when a system high pressure abnormality occurs, timing begins; when the first control module 5 receives a closing signal within the first set time period, that is, when the system high pressure returns to normal within the first set time period, timing continues, and when the timing reaches the second set time period, that is, when the compressor 1 stops for the second set time period, a start signal is output to the drive control module 3; when the drive control module 3 receives the start signal, it controls the compressor 1 to restart.

[0056] In this embodiment, when the system high pressure reaches an abnormally high point, the air conditioner stops and reduces the pressure; when the system high pressure returns to normal after the stop and pressure reduction, the compressor 1 is restarted, shortening the alarm duration, increasing the operating time, and improving the user experience.

[0057] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The first control module 5 is preset with a third set duration and a cycle number threshold S11, and is configured to re-time S71 when the system stops for more than a second set duration due to the high pressure of the system exceeding the set threshold and outputs a start signal; if the re-time period receives a disconnection signal S8 again within the third set duration, the compressor 1 is controlled to restart after the first set duration of shutdown and pressure reduction and the second set duration of delay.

[0058] If the retry start-up duration does not exceed the third set duration and the number of retry start-up / shutdown cycles reaches or exceeds the cycle count threshold S9, then the retry start of compressor 1 is stopped, and it is marked as a retry start failure S10. That is, when the number of retry start-up / shutdown cycles exceeds the cycle count threshold, the system is considered to be experiencing a high-pressure abnormality caused by abnormal factors, and troubleshooting is required.

[0059] In this embodiment, when the system high pressure reaches an abnormally high point, the air conditioner shuts down and reduces the pressure. Once the system high pressure recovers, the compressor 1 restarts. Furthermore, the system repeatedly attempts to restart when the system high pressure reaches an abnormally high point, increasing operating time and improving user experience. If a restart attempt fails, the system stops attempting to restart, protecting the system, reducing the probability of damage to system components, and thus lowering the maintenance and repair costs of the air conditioner.

[0060] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 10 The first control module 5 is also configured to stop the compressor 1 when the system high pressure is abnormally high and the compressor 1 stops and receives a disconnection signal again within the first set time period, and if it receives the shutdown signal, temperature stop signal or other fault signal S20 of all indoor units 6 within the second set time period, then stop the retry start S30 and continue to output the shutdown signal to the drive control module 3.

[0061] The air conditioner in this embodiment prevents abnormal restarts when the unit is normally shut down, thus improving the user experience.

[0062] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 The first control module 5 is also configured to trigger a high-voltage alarm S40 when a disconnection signal is received, and transmit the high-voltage alarm signal to the indoor unit 6; the indoor unit 6 triggers a high-voltage alarm based on the received high-voltage alarm signal.

[0063] The indoor unit 6 can trigger a high-voltage alarm via its display module, or it can transmit a high-voltage alarm signal to the wired controller 10 connected to it for high-voltage alarm activation. Alternatively, both the indoor unit 6 and the wired controller 10 connected to it can trigger a high-voltage alarm simultaneously.

[0064] The first control module 5 is also configured to perform a pressure switch K fault alarm S70 when it receives a disconnection signal and does not receive a closing signal within a first set time period, and transmit the pressure switch K fault alarm signal to the indoor unit 6; the indoor unit 6 then performs a pressure switch K fault alarm based on the received pressure switch K fault alarm signal.

[0065] Indoor unit 6 can trigger a pressure switch K fault alarm via its display module, or it can transmit the pressure switch K fault alarm signal to the wired controller 10, which is connected to it, to trigger a pressure switch K fault alarm. Alternatively, both indoor unit 6 and wired controller 10 can trigger a pressure switch K fault alarm simultaneously.

[0066] The first control module 5 is also configured to execute high-voltage alarm release S50 when it receives a disconnection signal and a closing signal within a first set time period (S4).

[0067] The first control module 5 is also configured to perform a system fault alarm S60 when the retry startup fails, i.e., when the number of retry startup cycles reaches the cycle count threshold, and transmit the system fault alarm signal to the indoor unit 6; the indoor unit 6 then performs a system fault alarm based on the received system fault alarm signal.

[0068] Indoor unit 6 can trigger a system fault alarm via its display module, or it can transmit a system fault alarm signal to the wired controller 10, which is connected to it, to trigger a system fault alarm. Alternatively, both indoor unit 6 and wired controller 10 can trigger system fault alarms simultaneously.

[0069] In this embodiment, the air conditioner will issue different alarms based on the different signals and system status received by the first control module 5 at different times, so that users, maintenance and repair personnel can clearly understand the status of the system and the location of the fault, thereby improving maintenance and repair efficiency.

[0070] Reference Figure 3 , Figure 4 , Figure 6 The present invention also discloses an air conditioner, which includes an outdoor unit; the outdoor unit includes a compressor 1, which is a variable frequency compressor 1 with adjustable operating speed.

[0071] The outdoor unit also includes a low-voltage DC power supply 2, which is used to output low-voltage DC power to power low-voltage electrical components. It can obtain AC power through the first rectifier module 21 and the switching power supply module 22.

[0072] The outdoor unit also includes a drive module 31, which is connected to the compressor 1 and is used to output the drive power of the compressor 1 to the compressor 1 according to the received control signal; the compressor 1 is driven to operate by the drive power provided by it.

[0073] The outdoor unit also includes a pressure switch K, which is installed on the high-pressure refrigerant pipe of the system. It is used to detect the system high pressure and disconnect when the system high pressure exceeds a preset threshold; and close when the system high pressure is lower than the preset threshold.

[0074] The low-voltage DC power supply 2 is connected to the drive module 31 through the pressure switch K. That is, the low-voltage DC power supply 2 is connected to one end of the two-position switch of the pressure switch K, and the other end of the two-position switch of the pressure switch K is connected to the power interface of the drive module 31.

[0075] When the system high voltage exceeds the preset threshold, the pressure switch K opens, and the low-voltage DC power supply 2 cannot supply power to the drive module 31, so the drive module 31 loses power and cannot work; when the system high voltage is lower than the preset threshold, the pressure switch K closes, the low-voltage DC power supply 2 supplies power to the drive module 31, and the drive module 31 is powered and works normally.

[0076] The outdoor unit also includes a signal acquisition module 4, which is connected to the pressure switch K and is used to acquire the open or closed signal of the pressure switch K.

[0077] The open or closed signal of pressure switch K can be obtained by the signal acquisition module 4 by detecting the voltage or current signal of the resistor connected in series with the two-position switch of pressure switch K.

[0078] Specifically, when the pressure switch K is closed, there is a supply current in the power supply lines of the low-voltage DC power supply 2, the pressure switch K, and the drive module 31, so the closing signal is a relatively strong voltage signal or a relatively strong current signal; when the pressure switch K is open, the supply current in the power supply lines of the low-voltage DC power supply 2, the pressure switch K, and the drive module 31 is zero or close to zero, so the opening signal is a relatively weak voltage signal or a relatively weak current signal.

[0079] The outdoor unit also includes a second control module 32, which includes a microcontroller connected to the drive module 31 and the signal acquisition module 4 respectively. It receives the disconnection signal or the closing signal acquired by the signal acquisition module 4, and outputs a stop signal to the drive module 31 when it receives the disconnection signal. The drive module 31 controls the compressor 1 to stop according to the stop signal.

[0080] The air conditioner of this invention directly de-energizes or supplies power to the drive module 31 by opening and closing the pressure switch K. The opening and closing of the pressure switch K is synchronized with whether the system high pressure value reaches a preset threshold. That is, as long as the system high pressure exceeds the preset threshold, and the preset threshold is close to the dangerous value of the system high pressure, the pressure switch K opens, and the drive module 31 is de-energized. The drive module 31 cannot operate, causing the compressor 1 to stop. The system high pressure reaching the preset threshold is linked to the opening of the pressure switch K. The opening of the pressure switch K directly de-energizes the drive module 31 without transmission delay, so that the compressor 1 stops operating without delay when the system high pressure reaches the preset threshold. This timely and rapid prevention of the system high pressure from continuing to rise improves system safety, reduces the probability of component damage, and reduces the maintenance and repair costs of the air conditioner.

[0081] In addition, when the signal acquisition module 4 transmits the acquired disconnection signal to the second control module 32, the second control module 32 determines that the system high pressure has reached the preset threshold and is within the dangerous range based on the disconnection signal. Then, it outputs a shutdown signal to the drive module 31, and the software controls the compressor 1 to stop. By combining the above hardware control of the compressor 1 to stop, the system high pressure reaches the preset threshold, and the hardware and software control the compressor 1 to stop separately. This improves the timeliness, reliability and effectiveness of the shutdown, and reduces the maintenance and repair costs of the air conditioner.

[0082] In some specific embodiments, refer to Figure 3 , Figure 4 , Figure 6 , Figure 7 The second control module 32 is preset with a first set duration and a second set duration S1; the first set duration is less than the second set duration.

[0083] The second control module 32 is configured to, upon receiving the disconnect signal S2 from the signal acquisition module 4, output a stop signal to start timing S3 and continue to receive signals acquired by the signal acquisition module 4; if a closing signal S4 is received within the first set duration of timing, timing continues S5, and when the timing reaches the second set duration S6, a start signal is output to the drive module 31 to control the compressor 1 to retry starting S7.

[0084] In some specific embodiments, refer to Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 The second control module 32 has a preset third set duration and cycle number threshold S11, and is configured to output a start signal to the drive module 31 to control the compressor 1 to start again when it restarts S71. If the timing time is within the range of the third set duration and a disconnect signal S8 is received from the signal acquisition module 4, a second restart S7 is performed.

[0085] If the number of consecutive retries reaches or exceeds the loop count threshold S9, then the retries will stop and the retries will be marked as failed S10.

[0086] Among them, continuous retry start means that the second control module 32 receives the disconnection signal from the signal acquisition module 4 within the third set time after each retry start of the compressor 1.

[0087] In this embodiment, when the system high pressure reaches an abnormally high point, the air conditioner shuts down and reduces the pressure. Once the system high pressure recovers, the compressor 1 restarts. Furthermore, the system repeatedly attempts to restart when the system high pressure reaches an abnormally high point, increasing operating time and improving user experience. If a restart attempt fails, the system stops attempting to restart, protecting the system, reducing the probability of damage to system components, and thus lowering the maintenance and repair costs of the air conditioner.

[0088] In some specific embodiments, refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 The air conditioner also includes at least one indoor unit 6; the outdoor unit also includes a main control module 7, which includes a microcontroller, and is connected to the indoor unit 6 and the second control module 32 respectively; the main control module 7 outputs the compressor 1 operating frequency or operating speed to the second control module 32 according to the start-up load of the indoor unit 6; the second control module 32 outputs the compressor 1 drive power according to the received compressor 1 operating frequency or operating speed, so that the compressor 1 operates according to the compressor 1 operating frequency or operating speed.

[0089] The second control module 32 is configured to output a high-voltage alarm signal to the main control module 7 when a disconnection signal is received; the main control module 7 performs a high-voltage alarm based on the received high-voltage alarm signal; the main control module 7 sends a high-voltage alarm signal to the indoor unit 6; the indoor unit 6 performs a high-voltage alarm on itself and / or on the wired controller 10 connected to it based on the received high-voltage alarm signal.

[0090] The second control module 32 is configured to output a system fault alarm signal to the main control module 7 when the retry start is determined to be a failure; the main control module 7 performs a system fault alarm based on the received system fault alarm signal; the main control module 7 sends a system fault alarm signal to the indoor unit 6; the indoor unit 6 performs a system fault alarm on itself and / or on the wired controller 10 connected to it based on the received system fault alarm signal.

[0091] In this embodiment, the air conditioner uses the main control module 7, indoor unit 6, and wired controller 10 to issue alarms for different situations, making it convenient for users and maintenance personnel to obtain system status and improving maintenance efficiency.

[0092] In some specific embodiments, refer to Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Figure 9 The second control module 32 is configured to send a cancel high-voltage alarm signal to the main control module 7 when it receives a closing signal within a first set time after receiving a disconnection signal; the main control module 7 cancels the high-voltage alarm according to the received cancel high-voltage alarm signal and sends a cancel high-voltage alarm signal to the indoor unit 6; the indoor unit 6 cancels the high-voltage alarm of itself and / or the wired controller 10 connected to it according to the received cancel high-voltage alarm signal.

[0093] The second control module 32 is configured to send a pressure switch K fault alarm signal to the main control module 7 if it does not receive a closing signal within a first set time after receiving the disconnection signal; the main control module 7 performs a pressure switch K fault alarm based on the received pressure switch K fault alarm signal and sends a pressure switch K fault alarm signal to the indoor unit 6; the indoor unit 6 performs a pressure switch K fault alarm for itself and the wired controller 10 connected to it based on the received pressure switch K fault alarm signal.

[0094] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0095] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioner, comprising an outdoor unit, which includes: The compressor drives the refrigerant circulation system; Low-voltage DC power supply, used to output low-voltage DC power; A drive control module, which is connected to the compressor, controls the compressor to operate at a given speed; The outdoor unit is characterized in that it further includes: A pressure switch is installed on the high-pressure pipeline of the refrigerant circulation system, with its two ends connected to the low-voltage DC power supply and the drive control module, respectively. It opens when the pressure exceeds a preset value and closes when the pressure is below the preset value. When the pressure switch is closed, the low-voltage DC power supply supplies power to the drive control module. When the pressure switch is open, the low-voltage DC power supply is disconnected from the drive control module. A signal acquisition module, which is connected to the pressure switch, is used to acquire the open or closed signal of the pressure switch; The first control module is communicatively connected to the drive control module and the signal acquisition module, respectively. It receives the disconnect signal or the closed signal, and outputs a stop signal to the drive control module when it receives the disconnect signal. The drive control module controls the compressor to stop according to the stop signal.

2. The air conditioner according to claim 1, characterized in that, It also includes at least one indoor unit; The first control module is the main control module, which is communicatively connected to the indoor unit and outputs the given speed to the drive control module according to the operating load of the indoor unit.

3. The air conditioner according to claim 2, characterized in that, The first control module has a first preset duration and a second preset duration that is longer than the first preset duration; The first control module is configured to start timing when it receives the disconnect signal; if it receives the closure signal when the timing time is within the first set duration, it continues timing, and outputs a start signal to the drive control module when the timing time reaches the second set duration. After receiving the start signal, the drive control module controls the compressor to retry starting.

4. The air conditioner according to claim 3, characterized in that, The first control module has a preset third set duration and a loop count threshold, and is configured to start timing after outputting the start signal to the drive control module; if the disconnect signal is received again within the third set duration, the timing is restarted and the start is retried after the timing reaches the second set duration; if the number of retry starts reaches the loop count threshold, the retry start is stopped and the retry start is marked as failed.

5. The air conditioner according to claim 4, characterized in that, The first control module is configured to trigger a high-pressure alarm when it receives the disconnect signal, and is also configured to trigger a pressure switch fault alarm if it does not receive the closing signal within the first set time period after receiving the disconnect signal, and to trigger a system fault alarm if the retry start fails.

6. The air conditioner according to any one of claims 3 to 5, characterized in that, The first control module is further configured to continue outputting the shutdown signal when the timing time reaches the second set duration after receiving shutdown signals, temperature-limited shutdown signals, or fault signals from all the indoor units before the timing time reaches the second set duration.

7. An air conditioner, comprising an outdoor unit, which includes: The compressor drives the refrigerant circulation system; Low-voltage DC power supply, used to output low-voltage DC power; A drive module, which is connected to the compressor, is used to output compressor drive power; The outdoor unit is characterized in that it further includes: A pressure switch is installed on the high-pressure pipeline of the refrigerant circulation system, with its two ends connected to the low-voltage DC power supply and the drive control module, respectively. It opens when the pressure exceeds a preset value and closes when the pressure is below the preset value. When the pressure switch is closed, the low-voltage DC power supply supplies power to the drive control module. When the pressure switch is open, the low-voltage DC power supply is disconnected from the drive control module. A signal acquisition module, which is connected to the pressure switch, is used to detect the open or closed signal of the pressure switch; The second control module is connected to the drive module and the signal acquisition module respectively, receives the disconnect signal or the close signal, and outputs a stop signal to the drive module when the disconnect signal is received; the drive module controls the compressor to stop according to the stop signal.

8. The air conditioner according to claim 7, characterized in that, The second control module has a first preset duration and a second preset duration that is longer than the first preset duration. The second control module is configured to start timing when the disconnect signal is received; if the closing signal is received within the first set time period, timing continues; and when the timing period reaches the second set time period, a start signal is output to the drive module to control the compressor to retry starting.

9. The air conditioner according to claim 8, characterized in that, The second control module has a preset third set duration and a cycle count threshold, and is configured to start timing when the start signal is output to the drive module; if the disconnect signal is received again within the third set duration, the timing is restarted and the start is retried after the timing reaches the second set duration; if the number of retry starts reaches the cycle count threshold, the retry start is stopped and the retry start is marked as failed.

10. The air conditioner according to claim 9, characterized in that, It also includes at least one indoor unit; the outdoor unit further includes a main control module, which is communicatively connected to the indoor unit and to the second control module, and outputs a given speed to the second control module according to the starting load of each indoor unit; the second control module controls the drive module to output compressor drive power according to the given speed; The second control module is configured to output a high-voltage alarm signal and a system fault alarm signal to the main control module when it receives the disconnection signal and the retry start fails; the main control module then performs the high-voltage alarm and system fault alarm.

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