air conditioner

Abstract

The present invention relates to an air conditioner, comprising an ambient temperature detection device for detecting the temperature of an indoor space, an outdoor fan and an indoor fan for driving air exchange, and an expansion valve for regulating the flow of refrigerant. The air conditioner adjusts internal control logic to meet the use requirements of the indoor space and is provided with a control strategy for quickly reaching a set temperature and maintaining a constant temperature for a long time. When the indoor space temperature changes to an upward trend, if the air conditioner is in an anti-freeze state, the expansion valve opening and the outdoor fan speed are coordinated and controlled within a short period of time to escape the anti-freeze frequency-limited temperature zone, thereby increasing the operating frequency of the compressor and thereby increasing the cooling input to the indoor space to maintain the temperature required for the mushroom growth environment.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning equipment, and in particular to an air-conditioner. Background Art

[0002] As society develops, people's demands for food variety are becoming increasingly demanding. Edible fungi, among other ingredients, are often subject to seasonal restrictions because their growth conditions are significantly affected by temperature and humidity. With technological advancements, industrialized mushroom production has become a growing trend. This involves using air conditioning and other equipment to rationally control indoor temperature and humidity to simulate the ideal growth environment for edible fungi.

[0003] For example, mushroom greenhouses are a prime example of a growing environment for edible fungi. Currently, the market primarily uses fixed-speed cold storage air conditioners to control the temperature and humidity within the greenhouse, enabling mushrooms to grow year-round, transcending seasonal constraints and filling a market gap. However, these air conditioners are typically custom-made, resulting in high prices, low energy efficiency, and long procurement cycles.

[0004] Existing standard commercial air conditioners can also achieve cooling and moisturizing effects, but because they are developed for human comfort, their temperature control range and air outlet temperature are designed to meet human needs. This significantly differs from the temperature and humidity required for mushroom greenhouses, making them unsuitable for use. However, standard commercial air conditioners are technologically mature and offer significant cost advantages. If they can be simply modified to meet the needs of mushroom greenhouses and introduced to the mushroom greenhouse market, they could bring significant social and economic benefits.

[0005] In view of this, this application is filed. Summary of the Invention

[0006] The present application provides an air conditioner, which optimizes the control logic of key internal components of an ordinary commercial air conditioner so that when the temperature fluctuates after reaching the set temperature, the air conditioner releases the anti-freeze state by adaptively controlling the opening of the electronic expansion valve and the fan speed, thereby maintaining the temperature within an allowable fluctuation range for a long time, so as to meet the use requirements of the indoor space and maintain the mushroom growth environment at a suitable temperature and humidity.

[0007] The present application provides an air conditioner comprising:

[0008] an indoor unit, which is installed in the indoor space;

[0009] A refrigerant circulation circuit in which the refrigerant circulates sequentially through a compressor, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger;

[0010] an indoor fan, configured to drive indoor air to exchange heat with the indoor heat exchanger and then be delivered from an air outlet, wherein the upper limit of the operating speed range of the indoor fan is defined as a first speed;

[0011] an outdoor fan, used to drive outdoor air to perform heat exchange with the outdoor heat exchanger, wherein the upper limit of the operating speed range of the outdoor fan is defined as the second speed;

[0012] The expansion valve is configured to control the flow of refrigerant from the outdoor heat exchanger to the indoor heat exchanger by adjusting its own opening during cooling operation, and the maximum opening of the expansion valve is defined as a first opening;

[0013] The highest permissible operating frequency of the compressor under frequency limit protection is defined as the first frequency;

[0014] An ambient temperature detection device is installed in the indoor space and is used to detect the temperature of the indoor space;

[0015] The controller is configured to: obtain the indoor space temperature, and when the indoor space temperature reaches the set temperature, if the indoor space temperature rises by the first preset temperature within a first preset time range, determine whether the air conditioner is in an anti-freeze state;

[0016] If the air conditioner is in the anti-freeze state, the speed of the outdoor fan is reduced, the indoor fan is operated at the first speed, and the expansion valve is opened to the first opening to release the anti-freeze state;

[0017] After the anti-freeze state is released, the compressor is increased to the first frequency, the outdoor fan is operated at the second speed, the indoor fan is operated at the first speed, and the expansion valve opening is controlled by the exhaust superheat, increasing the cooling input to the indoor space to reduce the increased temperature in the indoor space.

[0018] In some embodiments of the present application, the controller is further configured to:

[0019] After the indoor space temperature reaches the set temperature, within a first preset time range, when the indoor space temperature rises by the first preset temperature, if the air conditioner is not in the anti-freeze state, the compressor operates at a first frequency, the indoor fan operates at a first speed, the outdoor fan operates at a second speed, and the expansion valve opening is controlled by the exhaust gas superheat to directly increase the cooling input to the indoor space to compensate for the increased temperature in the indoor space.

[0020] In some embodiments of the present application, the controller is further configured to:

[0021] After the indoor space temperature reaches the set temperature, if the indoor space temperature drops by the first preset temperature within a first preset time range, the compressor frequency is reduced to a preset compressor frequency range, the indoor fan operates at a first speed, the outdoor fan speed reaches at least the lower speed limit corresponding to the current ambient temperature range, and the expansion valve opening is controlled by the exhaust superheat to reduce the cooling input to the indoor space and increase the lowered temperature in the indoor space.

[0022] In some embodiments of the present application, the controller is further configured to:

[0023] After the indoor space temperature reaches the set temperature, if the indoor space temperature drops by a second preset temperature within a second preset time range, the compressor stops running. After the preset time, when the indoor space temperature reaches at least the difference between the set temperature and the first preset temperature, the compressor is restarted to resume cooling input to the indoor space.

[0024] In some embodiments of the present application, the controller is further configured to:

[0025] After the indoor space temperature reaches the set temperature, within a first preset time range, if the indoor space temperature does not rise or fall by the first preset temperature, the indoor fan operates at a first speed, the speed of the outdoor fan at least reaches the speed lower limit corresponding to the current ambient temperature zone, the compressor operating frequency at least reaches the frequency lower limit corresponding to the current ambient temperature zone, and the expansion valve opening is controlled by the exhaust superheat.

[0026] In some embodiments of the present application, the controller is further configured to:

[0027] If the indoor space temperature does not reach the set temperature, the indoor fan runs at the first speed, the outdoor fan runs at the second speed, the compressor runs at the first frequency, and the expansion valve opening is controlled by the exhaust superheat to increase the cooling / heating load input of the air conditioner to the indoor space.

[0028] In some embodiments of the present application, the controller further comprises:

[0029] When the first signal is received, the evaporator anti-freeze temperature is configured as a first anti-freeze temperature;

[0030] When the second signal is received, the evaporator anti-freeze temperature is configured as a second anti-freeze temperature;

[0031] Among them, the second anti-freezing temperature is lower than the first anti-freezing temperature, so that the lowest temperature that the evaporator can reach under the control of the second signal is lower than the lowest temperature that the evaporator can reach under the control of the first signal, so that the air conditioner can output a lower temperature airflow when receiving the second signal than when the air conditioner receives the first signal.

[0032] In some embodiments of the present application, the controller further comprises:

[0033] When the first signal is received, the evaporator overload prevention temperature is configured as a first overload prevention temperature;

[0034] When the second signal is received, the evaporator overload prevention temperature is configured as a second overload prevention temperature;

[0035] Among them, the second overload protection temperature is greater than the first overload protection temperature, so that the maximum temperature that the evaporator can reach under the control of the second signal is higher than the maximum temperature that the evaporator can reach under the control of the first signal, so that the air conditioner can output a higher temperature airflow when receiving the second signal than when the air conditioner receives the first signal.

[0036] In some embodiments of the present application, further comprising:

[0037] Multiple sensors are installed on the compressor, condenser, evaporator and other connecting pipes of the air conditioner to detect the operation of the corresponding components, the temperature of the corresponding components and the humidity at the corresponding locations;

[0038] A pressure switch is provided at least on the compressor suction line and the exhaust line to control the flow of refrigerant in the circuit;

[0039] The controller is configured to close the pressure switch to disconnect the circuit when the pressure of the refrigeration system exceeds a preset value.

[0040] The present application also provides another air conditioner, including:

[0041] an indoor unit, which is installed in the indoor space;

[0042] A refrigerant circulation circuit in which the refrigerant circulates sequentially through a compressor, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger;

[0043] an indoor fan, configured to drive indoor air to exchange heat with the indoor heat exchanger and then be delivered from an air outlet, wherein the upper limit of the operating speed range of the indoor fan is defined as a first speed;

[0044] an outdoor fan, used to drive outdoor air to perform heat exchange with the outdoor heat exchanger, wherein the upper limit of the operating speed range of the outdoor fan is defined as the second speed;

[0045] The expansion valve is configured to control the flow of refrigerant from the outdoor heat exchanger to the indoor heat exchanger by adjusting its own opening during cooling operation, and the maximum opening of the expansion valve is defined as a first opening;

[0046] The highest permissible operating frequency of the compressor under frequency limit protection is defined as the first frequency;

[0047] An ambient temperature detection device is installed in the indoor space and is used to detect the temperature of the indoor space;

[0048] The controller is configured as:

[0049] Get the indoor space temperature;

[0050] After receiving the first signal, the air outlet temperature of the air conditioner can reach the first air outlet temperature range;

[0051] When the second signal is received, the air outlet temperature of the air conditioner may reach a second air outlet temperature range, wherein at least a lower limit of the second air outlet temperature range is lower than a lower limit of the first air outlet temperature range; and at least the following steps may be performed:

[0052] After receiving the second signal and after the indoor space temperature reaches the set temperature, if the indoor space temperature rises by the first preset temperature within the first preset time range, determining whether the air conditioner is in the anti-freeze state;

[0053] If the air conditioner is in the anti-freeze state, the speed of the outdoor fan is reduced, the indoor fan operates at the first speed, and the expansion valve is opened to the first opening to release the anti-freeze state; after the anti-freeze state is released, the compressor is increased to the first frequency to operate, the outdoor fan operates at the second speed, the indoor fan operates at the first speed, and the expansion valve opening is controlled by the exhaust superheat to increase the cooling input to the indoor space to reduce the increased temperature in the indoor space.

[0054] In the above embodiments, the present application proposes an air conditioner comprising an ambient temperature detection device disposed within an indoor space, an indoor fan and an outdoor fan for driving air heat exchange, and an expansion valve for regulating refrigerant flow. The controller is configured to operate in a normal mode upon receiving a first signal and in an indoor space mode upon receiving a second signal. When controlled by the second signal, the air conditioner's achievable temperature range and air outlet temperature range are both set to accommodate mushroom growth, and under the second signal, at least a temperature range can be reached that is lower than the lower limit of the temperature range achievable under the first signal.

[0055] When the air conditioner is in cooling mode and the long period of low temperature causes it to reach the anti-freeze protection temperature, the anti-freeze state is released by reducing the outdoor fan speed, maintaining the indoor fan speed at the first speed (i.e. the upper limit of the operating speed range), and opening the expansion valve to the first opening (i.e. the maximum opening). This prevents the compressor from running at low frequency due to the evaporation temperature being in the anti-freeze frequency limit range, causing the air conditioner's cold input to the indoor space to be insufficient to maintain a temperature suitable for mushroom growth, so that ordinary commercial air conditioners can meet the use needs of indoor spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0057] Figure 1 is a structural diagram of an air conditioner provided according to an exemplary embodiment;

[0058] Figure 2 is a hardware configuration diagram of an air conditioner according to an exemplary embodiment;

[0059] Figure 3 A hardware configuration block diagram of a controller provided according to an exemplary embodiment;

[0060] Figure 4 The control logic for adapting the air conditioner to the indoor space according to the exemplary embodiment;

[0061] Figure 5 The control logic for maintaining the temperature of the indoor space for a long time according to the air conditioner in the exemplary embodiment;

[0062] Figure 6 A control logic for quickly reaching a set temperature for an air conditioner according to an exemplary embodiment;

[0063] Figure 7 is a circuit schematic diagram of an air-conditioning refrigerant circulation loop according to an exemplary embodiment;

[0064] Figure 8 is a schematic diagram of indoor space temperature according to an exemplary embodiment;

[0065] Figure 9 is a schematic diagram of air-conditioning compressor frequency according to an exemplary embodiment;

[0066] Figure 10 is a schematic diagram of the temperature of the indoor heat exchanger coil of the air conditioner after the indoor space temperature reaches the set temperature according to an exemplary embodiment;

[0067] Figure 11 is a schematic diagram of the frequency of the air-conditioning compressor after the indoor space temperature reaches the set temperature according to an exemplary embodiment;

[0068] Figure 12 is a schematic diagram of the indoor space temperature after the indoor space temperature reaches the set temperature according to an exemplary embodiment;

[0069] Figure 13 The control logic of the air conditioner when the temperature of the indoor space rises according to the exemplary embodiment;

[0070] In the above figures:

[0071] Air conditioner 100; indoor unit 11; outdoor unit 14; control device 200;

[0072] Controller 21; compressor 3; outdoor fan 4; indoor fan 5; expansion valve 6; ambient temperature detection device 7;

[0073] Bus 211; Memory 212; Processor 213; Communication Interface 214;

[0074] Outdoor heat exchanger 701; four-way valve 702; outdoor heat exchanger 703. DETAILED DESCRIPTION

[0075] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0076] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "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 invention and simplifying the description, rather than indicating or implying 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 limiting the present invention.

[0077] The terms "first," "second," and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of the features.

[0078] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections via an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0079] The embodiment of the present application provides an air conditioner 100, referring to Figure 1The air conditioner 100 includes a refrigeration system for exchanging heat with indoor air to meet cooling or heating needs.

[0080] The refrigeration system includes a compressor 3 , a condenser, an expansion valve 6 , and an evaporator. In the present application, the air conditioner 100 performs a refrigeration cycle of the air conditioner 100 by using the compressor 3 , the condenser, the expansion valve 6 , and the evaporator.

[0081] Compressor 3 compresses 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, releasing heat into the surrounding environment through the condensation process. The highest allowable operating frequency of compressor 3 under various frequency-limiting protections is defined as the first frequency.

[0082] The expansion valve 6 expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve 6 and returns the low-temperature, low-pressure refrigerant gas to the compressor 3. During cooling operation, the expansion valve 6 controls the flow of refrigerant from the outdoor heat exchanger to the indoor heat exchanger by adjusting its opening. Its maximum opening is defined as the first opening.

[0083] The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled.

[0084] The outdoor unit of the air conditioner 100 refers to a portion of a refrigeration cycle including the compressor 3 and the outdoor heat exchanger 703 , the indoor unit of the air conditioner 100 includes the indoor heat exchanger 701 , and the expansion valve 6 may be provided in the indoor unit or the outdoor unit.

[0085] The indoor heat exchanger 701 and the outdoor heat exchanger 703 function as a condenser or an evaporator. When the indoor heat exchanger 701 functions as a condenser, the air conditioner 100 functions as a heater in heating mode, and when the indoor heat exchanger 703 functions as an evaporator, the air conditioner 100 functions as a cooler in cooling mode.

[0086] like Figure 7 As shown, during cooling operation, the refrigerant compressed by compressor 3 passes through four-way valve 702 and flows through outdoor heat exchanger 703 (condenser) to condense. The condensed refrigerant then expands by flowing through expansion valve 6. The expanded refrigerant evaporates through indoor heat exchanger 703 (evaporator). The evaporated refrigerant then circulates back to compressor 3.

[0087] During heating operation, the refrigerant compressed by compressor 3 passes through four-way valve 702 and flows through indoor heat exchanger 703 (condenser) to condense. The condensed refrigerant then expands by flowing through expansion valve 6. The expanded refrigerant evaporates through outdoor heat exchanger 703 (evaporator). The evaporated refrigerant then circulates back to compressor 3.

[0088] Currently, air conditioners are generally suitable for scenarios such as home interiors, shopping mall interiors, and office building interiors. Their usage scenarios are mainly people-oriented. The development of various air conditioner performance indicators is also based on meeting people's comfort. Their temperature control range and air outlet temperature are affected by human body temperature.

[0089] However, the cooling and heating performance of current air conditioners cannot meet the cooling and heating needs of other animals and plants due to their own performance limitations.

[0090] In the embodiments of this application, a set of control logic optimizations is proposed for the structural components of existing air conditioners, making existing air conditioners suitable for a wider range of usage scenarios. For example, the air conditioner of this application can be adapted to meet the temperature requirements of an indoor space for growing mushrooms (hereinafter referred to as an indoor space), which can be configured as a greenhouse.

[0091] Specifically, due to its own industrial attributes, the indoor space needs to simulate the mushroom growth environment as the main technical indicator, that is, the temperature control range and air outlet temperature of the selected air conditioner need to meet the temperature and humidity suitable for mushroom growth.

[0092] The air conditioner 100 in this application includes an indoor unit 11 and an outdoor unit 14. The indoor unit 11 and the outdoor unit 14 can be configured as an integrated unit or a split unit. The indoor unit 11 can be configured as a wall-mounted unit, a ceiling unit, a duct unit, a central air conditioner, etc.

[0093] Reference Figure 1 Taking an indoor hanging machine as an example, an indoor hanging machine is usually installed at a location such as an indoor wall. For another example, an indoor cabinet machine (not shown in the figure) is also a form of the indoor machine 11.

[0094] Taking a split unit as an example, the air conditioner 100 includes an indoor unit 11 and an outdoor unit 14, wherein the outdoor unit 14 is usually arranged outdoors and is used to achieve temperature changes in the indoor environment by exchanging heat with outdoor wind.

[0095] The indoor unit 11 of the air conditioner 100 in the embodiment of the present application is arranged in the indoor space. The indoor unit 11 can be used to adjust the temperature and humidity in the indoor space so that the environment in the indoor space reaches a suitable environment for mushroom growth.

[0096] The indoor unit 11 also includes an indoor fan 5, which is used to drive the indoor air to exchange heat with the indoor heat exchanger and then be sent out from the air outlet 2. The indoor fan 5 includes multiple gears, which are used to change the outlet wind speed of the outlet air flow of the air outlet 2. The upper limit of the operating speed range of the indoor fan 5 is defined as the first speed.

[0097] The outdoor unit 14 also includes an outdoor fan 4 for driving outdoor air to exchange heat with the outdoor heat exchanger. It includes multiple speed ranges corresponding to the gears of the indoor fan 5. The upper limit of the working speed range of the outdoor fan 4 is defined as the second speed.

[0098] In addition, if Figure 1 As shown in FIG, air conditioner 100 includes a controller 21 for controlling the operation of various components within air conditioner 100, thereby enabling the various components to operate and achieve various predetermined functions of air conditioner 100. Furthermore, air conditioner 100 is also provided with a control device 200. For example, control device 200 is specifically configured as a remote control that communicates with controller 21 using, for example, infrared or other communication methods. The remote control allows the user to control various aspects of air conditioner 100 and enables interaction between the user and air conditioner 100.

[0099] In some embodiments, the operating frequency of the compressor, the operating speed of the indoor fan, and the operating speed of the outdoor fan can be controlled based on the indoor temperature. Specifically, the indoor temperature can be divided into temperature zones, with each zone having a corresponding operating frequency range for the compressor, indoor fan speed range for the indoor fan, and outdoor fan speed range for the outdoor fan. This implements the temperature control logic of the air conditioner and enables automatic adjustment of the operation of various components based on the indoor temperature.

[0100] In the embodiment shown in this application, the controller 21 is a device that can generate an operation control signal based on a command operation code and a timing signal, thereby instructing the air conditioner 100 to execute the control command. For example, in response to receiving a power-on or power-off command from a user, the controller 21 can execute an operation related to the object selected by the power-on or power-off command.

[0101] The embodiment of the present application also provides a hardware structure diagram of a controller 21, such as Figure 3 As shown, the controller 21 includes a processor 213 and, optionally, a memory 212 and a communication interface 214 connected to the processor 213. The processor 213, the memory 212 and the communication interface 214 are connected via a bus 211.

[0102] The processor 213 may be a central processing unit (CPU), a general-purpose processor (GP) 213, a network processor (NP), a digital signal processor (DSP), a microprocessor (MCU), a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 213 may also be any other device having a processing function, such as a circuit, a device, or a software module. The processor 213 may also include multiple CPUs, and the processor 213 may be a single-core (single-CPU) processor 213 or a multi-core (multi-CPU) processor 213. The processor 213 herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

[0103] The memory 212 can be a read-only memory 212 (ROM) or other types of static storage devices that can store static information and instructions, a random access memory 212 (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory 212 (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer, and the embodiments of the present application do not impose any restrictions on this. The memory 212 can exist independently or be integrated with the processor 213. Among them, the memory 212 can contain computer program code. The processor 213 is used to execute the computer program code stored in the memory 212, thereby implementing the control method of the multi-split air conditioner 100100 system provided in the embodiment of the present application.

[0104] The communication interface 214 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc.). The communication interface 214 can be a module, a circuit, a transceiver or any device that can achieve communication.

[0105] The bus 211 may be a peripheral component interconnect (PCI) bus 211 or an extended industry standard architecture (EISA) bus 211. The bus 211 may be divided into an address bus 211, a data bus 211, a control bus 211, etc. For ease of representation, Figure 3 Although only one thick line is used in the figure, it does not mean that there is only one bus 211 or only one type of bus 211.

[0106] In some implementations of this embodiment, the air conditioner 100 further includes an ambient temperature detection device 7 , which is installed in the indoor space and is used to detect the temperature of the indoor space.

[0107] Exemplarily, the ambient temperature detection device 7 can be configured as a temperature sensor, which detects a temperature value at a certain location at a certain moment and sends the detected temperature value to the controller.

[0108] To make the detection data more accurate, multiple temperature sensors can be set up and installed in different locations inside the indoor space. The temperature value detected by each temperature sensor is sent to the controller and the average value is taken to determine the real-time temperature inside the indoor space.

[0109] It is known that the controller can first reduce the noise of the obtained temperature to remove obviously abnormal values, and then perform algorithm calculation to obtain the temperature in the indoor space. Since this is not the focus of the present invention, it will not be described in detail.

[0110] In order to make the external parameters obtained by the air conditioner more accurate so as to adjust the working state of the air conditioner, in some implementations of this embodiment, the air conditioner 100 also includes a sensing unit, which includes multiple temperature or humidity sensors arranged on the compressor 3, condenser, evaporator and other connecting pipes of the air conditioner 100 to obtain data related to the action and status of the air conditioner.

[0111] For example, a temperature sensor for detecting the coil temperature is installed at the coil position of the indoor heat exchanger; a temperature sensor for temperature compensation is installed at the air outlet 2 and the return air outlet of the air conditioner; multiple humidity sensors connected to the controller are used to detect the humidity at various locations in the indoor space, etc.

[0112] In some implementations of this embodiment, multiple air conditioners 100 can be set according to the air conditioner model, indoor unit type or different needs of different locations in the indoor space. Each air conditioner can adjust the temperature and humidity of its location individually, or it can be integrated into the same control system for unified control.

[0113] In some implementations of this embodiment, the expansion valve 6 uses an electronic expansion valve, which has better response speed and adaptability.

[0114] The electronic expansion valve in this application mainly adopts DSH (Discharge Super Heat) control. Of course, it is known that the electronic expansion valve can also be opened by exhaust temperature control, suction superheat control, etc.

[0115] The algorithms specifically involved in the above control process include proportional control algorithm PID (Proportion Integral Derivative) control algorithm, fuzzy control algorithm, etc. These control methods vary slightly depending on the system. One or more control methods can be selected according to different system characteristics to meet the control requirements of the air conditioner.

[0116] In some implementations of this embodiment, the electronic expansion valve adopts DSH control (Discharge SuperHeat, exhaust superheat). The exhaust superheat is the temperature difference between the temperature of the compressor exhaust pipe or the condenser inlet and the saturation temperature corresponding to the actual condensing pressure, which means that the current actual temperature is a few degrees higher than the saturation temperature corresponding to the actual pressure.

[0117] In semi-hermetic or fully hermetic compressor systems, the electronic expansion valve can be installed not only at the condenser inlet but also at the compressor exhaust pipe. The valve's opening is adjusted based on the rate of change of the superheat. Specifically, when the exhaust superheat falls below the set value, the electronic expansion valve opens wider; when the exhaust superheat rises above the set value, the valve opens narrower.

[0118] To meet the growth needs of mushrooms, the temperature in the indoor space needs to be maintained at a low value for a long time, such as maintaining 10℃ for two to three days.

[0119] However, if an ordinary commercial air conditioner without control logic adjustment runs in low-temperature cooling mode for a long time, it will reach the anti-freeze protection temperature, triggering the anti-freeze protection function, limiting the compressor 3 to operate within a lower frequency range to protect the air conditioner.

[0120] At this time, if it is during the transition between day and night and the sun rises, that is, when the external temperature of the indoor space rises and causes the indoor space temperature to rise accordingly, the ordinary commercial air conditioner will not be able to ensure sufficient cooling input to the indoor space because the evaporation temperature is always within the anti-freezing frequency limit temperature range, and the low-frequency operation of compressor 3 will eventually cause the actual temperature in the indoor space to be higher than the set temperature, and the temperature requirements of the mushroom growth environment cannot be met.

[0121] In this embodiment, when a rise in the indoor space temperature is detected, if the air conditioner is in an anti-freeze state at this time, the speed of the outdoor fan 4 is reduced, and the expansion valve is opened to the first opening to release the anti-freeze state, and then the compressor 3 is allowed to increase the frequency to increase the cooling input to the indoor space, and finally the indoor space temperature is restored to the set temperature range.

[0122] The air conditioner in this application can retain two sets of control logic and select the corresponding control logic to operate according to the received signal. In other words, the air conditioner in this application can meet the temperature range required by the human body and the temperature range required for mushroom growth.

[0123] Specifically, when the air conditioner receives the first signal, it uses its own logic to select a temperature that meets the temperature requirements of the human body; when the air conditioner receives the second signal, it uses its own logic to select a temperature that meets the temperature range for mushroom growth.

[0124] Of course, the air conditioner in this application may also only include a set of control logic for mushroom growth.

[0125] refer to Figure 4 The following uses an air conditioner having two sets of control logic as an example to illustrate the control logic of the air conditioner in the embodiment of the present application.

[0126] Obtaining indoor space temperature and air conditioning set temperature (step S401);

[0127] After step S401, two sets of control logic may be executed, upon receipt of the first signal (step S402) or upon receipt of the second signal (step S403);

[0128] After step S402, step S404 is executed, the speed of the indoor fan 5 and the outdoor fan 4 at least reaches the speed lower limit corresponding to the current ambient temperature zone, and the operating frequency of the compressor 3 at least reaches the frequency lower limit corresponding to the current ambient temperature zone.

[0129] It can be seen that, under the control of the first signal, the air outlet temperature of the air conditioner can reach the first air outlet temperature range, and the temperature of the space where the air conditioner is located can reach the first temperature range;

[0130] It should be noted that the control logic corresponding to the receipt of the first signal is the control logic of a common commercial air conditioner, which is designed primarily for people. The first temperature range and the first air outlet temperature are both based on the satisfaction of human comfort. Its usage scenarios are mainly shopping malls, office buildings, and residences.

[0131] Under the control logic of the first signal, whether the second signal is received (step S405);

[0132] In step S405, if the second signal is not received, step S406 is executed to control the air conditioner to make the indoor space temperature reach the corresponding set temperature;

[0133] In step S405, if the second signal is received, step S407 is executed, the indoor fan operates at the first speed, the outdoor fan operates at the second speed, and the compressor operates at the first frequency to reach the corresponding set temperature as quickly as possible.

[0134] It can be seen that, under the control of the second signal, the air outlet temperature of the air conditioner can reach the second air outlet temperature range, and the temperature of the space where the air conditioner is located can reach the second temperature range;

[0135] Specifically, the control logic executed after receiving the second signal is designed to meet the use requirements of the indoor space, and the second temperature range and the second air outlet temperature are both based on the mushroom growth environment.

[0136] The above temperature ranges satisfy that at least the lower limit of the second temperature range is lower than the lower limit of the first temperature range, and at least the lower limit of the second air outlet temperature range is lower than the lower limit of the first air outlet temperature range;

[0137] For example, the first temperature range is set to 16-32°C, and the second temperature range is set to 9-32°C; when cooling, the first air output range is set to 12-18°C, and the second air output range is set to 5-7°C;

[0138] Similarly, if the first air outlet range is set to 30-45°C during heating, the second air outlet range is set to have at least an upper limit greater than the upper limit of the first air outlet range, specifically, based on the indicator of mushroom growth.

[0139] Under the control logic of the second signal, step S407 is executed, and then the air conditioner is controlled to operate so that the indoor space temperature reaches the set temperature (step S408);

[0140] Within the first preset time range, the indoor space temperature rises by the first preset temperature (step S412), and it is determined whether the air conditioner is in the anti-freeze state (step S409);

[0141] Specifically, the first preset time range and the first preset temperature are set by designers through experiments based on the relationship between the growth situation of mushrooms and temperature, or by indoor space staff based on actual application conditions;

[0142] In step S409, if the air conditioner is in cooling mode and in the anti-freeze state, step S410 is executed to reduce the speed of the outdoor fan 4, operate the indoor fan 5 at the first speed, and open the expansion valve 6 to the first opening degree to release the anti-freeze state;

[0143] After the anti-freeze state is released (step S413), step S414 is executed, the compressor 3 is increased to the first frequency, the outdoor fan 4 is restored to the second speed, the indoor fan 5 is operated at the first speed, and the opening of the expansion valve 6 is controlled by the exhaust superheat; thereby increasing the cooling input to the indoor space to reduce the elevated temperature in the indoor space;

[0144] For example, the outdoor fan 4 is reduced by 50r every minute until the anti-freeze state is released; the expansion valve is opened to the first opening and maintained for 1 minute, and then the exhaust superheat control is restored;

[0145] In step S414, the operating frequency of the compressor 4 and the speed of the indoor fan 4 may be increased simultaneously, or the operating frequency of the compressor 4 may be increased to the first frequency first and then the speed of the indoor fan 4 may be increased.

[0146] When the operating frequency of the compressor 4 is increased first, the cooling capacity of the refrigeration system can be increased first, and then the speed of the outdoor fan 4 is increased to improve the heat exchange efficiency of the outdoor heat exchanger, thereby improving the heat exchange efficiency between the indoor heat exchanger and the air in the indoor space, so that the indoor space can be restored to the set temperature as soon as possible.

[0147] In step S409, if the air conditioner is not in the anti-freeze state, step S411 is executed, the compressor 3 operates at the first frequency, the indoor fan 5 operates at the first speed, the outdoor fan 4 operates at the second speed, and the opening of the expansion valve 6 is controlled by the exhaust superheat.

[0148] By changing the operating frequency of the compressor 3 and controlling the operating speeds of the indoor fan 5 and the outdoor fan 4, when the temperature of the indoor space rises in the warm state, the cooling input to the indoor space is directly increased to compensate for the increased temperature in the indoor space, so that the temperature of the indoor space is reduced to the upper limit of the set temperature range, thereby meeting the external environment required for the growth of mushrooms.

[0149] In the above steps, by collaboratively controlling the outdoor fan 4 and the expansion valve 6 in a short period of time, the evaporation temperature (here refers to the coil temperature of the indoor heat exchanger) is rapidly released from the anti-freezing temperature zone, thereby increasing the frequency of the compressor 3 and ultimately increasing the cooling load input of the air conditioner to the indoor space, thereby maintaining the temperature in the indoor space within the set temperature range and ensuring a good environment for mushroom growth.

[0150] In some implementations of this embodiment, in order to maintain the mushroom growth environment for a long time, after the air conditioner has adjusted the temperature of the indoor space to reach the set temperature range, within the first preset time, when the real-time temperature detected by the ambient temperature detection device 7 changes significantly from the set temperature, a series of control logics are also set to restore the fluctuating temperature inside the indoor space.

[0151] Specifically, the operating frequency of the compressor 3, the speed of the outdoor fan 4 and the indoor fan 5, and the opening of the expansion valve 6 are adjusted according to the temperature change to increase or decrease the cooling load input to the indoor space, thereby restoring the indoor space temperature to the set temperature.

[0152] refer to Figure 5 , illustrating the control logic corresponding to the air conditioner in the embodiment of the present application for maintaining the temperature of the indoor space for a long time.

[0153] Receiving a second signal (step S501);

[0154] The indoor fan is operated at a first speed, the outdoor fan is operated at a second speed, and the compressor is operated at a first frequency (step S502) to reach the corresponding set temperature as quickly as possible;

[0155] Determine whether the indoor space temperature reaches the set temperature (step S503);

[0156] In step S503, if the indoor space temperature does not reach the set temperature, step S502 is executed;

[0157] In step S503, if the indoor space temperature has reached the set temperature, step S504 is executed to determine whether the indoor space temperature is maintained within the first preset temperature range within the first preset time;

[0158] In step S504, if the indoor space temperature is maintained within the first preset temperature range, step S505 is executed, the indoor fan 5 is operated at the first speed, the speed of the outdoor fan 4 reaches at least the lower limit of the speed range corresponding to the current ambient temperature zone, the operating frequency of the compressor 3 reaches at least the lower limit of the frequency range corresponding to the current ambient temperature zone, and the opening of the expansion valve 6 is controlled by the exhaust superheat;

[0159] In step S504, if the indoor space temperature is not maintained within the first preset temperature range, step S506 is executed to determine whether the indoor space temperature has risen by the first preset temperature;

[0160] In step S506, if the indoor space temperature rises to the first preset temperature, step S507 is executed to determine whether the air conditioner is in an anti-freeze state;

[0161] In step S507, if the air conditioner is not in the anti-freeze state, step S508 is executed, the compressor 3 operates at the first frequency, the indoor fan 5 operates at the first speed, the outdoor fan 4 operates at the second speed, and the opening of the expansion valve 6 is controlled by the exhaust superheat;

[0162] In step S507, if the air conditioner is in the anti-freeze state, step S509 is executed to reduce the speed of the outdoor fan 4, operate the indoor fan 5 at the first speed, and open the expansion valve 6 to the first opening degree to release the anti-freeze state;

[0163] After the anti-freeze state is released (step S514), step S515 is executed, the compressor 3 is increased to the first frequency, the outdoor fan 4 is operated at the second speed, the indoor fan 5 is operated at the first speed, and the opening of the expansion valve 6 is controlled by the exhaust superheat;

[0164] While executing step S506, step S510 may be executed to determine whether the temperature drop in the indoor space reaches a second preset temperature;

[0165] In step S510, if the falling temperature reaches the second preset temperature, step S513 is executed, and the compressor 3 stops running;

[0166] After executing step S513, after a preset time has passed, executing step S516, determining whether the indoor space temperature has reached the set temperature;

[0167] In step S516, if the set temperature is reached, step S517 is executed to restart the compressor 3;

[0168] In step S516, if the set temperature has not been reached, step S516 is executed;

[0169] In step S510, if the falling temperature does not reach the second preset temperature, step S512 is executed to determine whether the falling temperature of the indoor space reaches the first preset temperature;

[0170] In step S512, if the falling temperature reaches the first preset temperature, step S511 is executed, the frequency of the compressor 3 is reduced, the indoor fan 5 operates at the first speed, the speed of the outdoor fan 4 at least reaches the lower limit of the speed corresponding to the current ambient temperature zone, the operating frequency of the compressor 3 at least reaches the lower limit of the frequency corresponding to the current ambient temperature zone, and the opening of the expansion valve 6 is controlled by the exhaust superheat; so that the temperature can quickly return to the set temperature range.

[0171] In step S512 , if the falling temperature does not reach the first preset temperature, step S512 is executed.

[0172] It can be known that step S510 can be executed in parallel with step S506, or can have a set execution order with step S506.

[0173] In this embodiment, when the operating frequency of the compressor 3 is at the frequency corresponding to the current ambient temperature zone, the frequency is less than or equal to the first frequency; the first preset temperature and the second preset temperature are set values, which can be adjusted according to actual conditions, and the second preset temperature value is greater than the first preset temperature.

[0174] For example, the first preset temperature is 1°C and the second preset temperature is 2°C. When the indoor temperature drops by less than 1°C, it means that it is maintained in the first preset temperature range. At this time, step S505 can be executed to save air conditioning energy consumption.

[0175] When the indoor space temperature drops by more than 1°C but less than 2°C, it means that the indoor space temperature has dropped by the first preset temperature, and step S511 is executed to reduce the operating frequency of the compressor to reduce the cooling load input to the indoor space;

[0176] When the indoor temperature drops by 2°C, it means that it has dropped by the second preset temperature. Step S513 is executed to stop the refrigeration system from inputting cold energy by controlling the compressor to restore the indoor temperature to the set temperature range.

[0177] The control logic under the first signal control typically uses a gradual approach to the set temperature to minimize human comfort, preventing the potential problems associated with sudden temperature changes. Due to their industrial nature, indoor spaces require rapid simulation of an artificial environment suitable for mushroom growth. This means reaching the set temperature quickly to meet indoor space usage requirements.

[0178] In some implementations of this embodiment, under the control of the second signal, the various components of the air conditioner operate on the premise of quickly reaching the set temperature range. Specifically, the indoor fan 5 operates at a first speed, the outdoor fan 4 operates at a second speed, and the compressor 3 operates at a first frequency. It should be noted that the first speed and the second speed are the upper limits of the corresponding fan operating speed range, and the first frequency is the highest frequency of the compressor 3 under various frequency limiting protections.

[0179] refer to Figure 6 , explaining the control logic corresponding to the rapid temperature reaching of the air conditioner in the embodiment of the present application.

[0180] Receiving a second signal (step S601);

[0181] Determine whether the indoor space temperature reaches the set temperature (step S602);

[0182] In step S602, if the indoor space temperature does not reach the set temperature, step S603 is executed, the indoor fan 5 is operated at the first speed, the outdoor fan 4 is operated at the second speed, the compressor 3 is operated at the first frequency, and the opening of the expansion valve 6 is controlled by the exhaust superheat;

[0183] After step S603, it is determined whether the indoor space temperature reaches the set temperature (step S604);

[0184] In step S602 or in step S604, if the indoor space temperature has reached the set temperature, step S605 is executed to enter the logic control after reaching the set temperature. It can be understood that the control logic after step S605 is Figure 5 The air conditioner shown here is designed to maintain the indoor temperature for a long period of time.

[0185] In some implementations of this embodiment, the controller 21 is configured such that, upon receiving the first signal, the evaporator anti-freezing temperature is configured to be the first anti-freezing temperature;

[0186] When the second signal is received, the evaporator anti-freeze temperature is configured as a second anti-freeze temperature;

[0187] Among them, the second anti-freezing temperature is lower than the first anti-freezing temperature, so that the lowest temperature that the evaporator can reach under the control of the second signal is lower than the lowest temperature that the evaporator can reach under the control of the first signal, so that the air conditioner can output a lower temperature airflow when receiving the second signal than when the air conditioner receives the first signal.

[0188] In some embodiments of this embodiment, when a first signal is received, the evaporator overload protection temperature is configured as a first overload protection temperature; when a second signal is received, the evaporator overload protection temperature is configured as a second overload protection temperature, wherein the second overload protection temperature is greater than the first overload protection temperature, so that the maximum temperature that the evaporator can reach under the control of the second signal is higher than the maximum temperature that the evaporator can reach under the control of the first signal, so that the air conditioner can output a higher temperature airflow when receiving the second signal than when the air conditioner receives the first signal.

[0189] By adjusting the anti-freezing temperature and anti-overload temperature, the cooling air outlet temperature can be further lowered and the heating air outlet temperature can be increased to meet the requirements of rapid temperature reaching of the air conditioner and meet the use needs of the indoor space.

[0190] For example, if the first anti-freezing temperature is 3°C and the first anti-overload temperature is 58°C, the second anti-freezing temperature may be set to 0°C and the second anti-overload temperature may be set to 63°C.

[0191] In some implementations of this embodiment, to save costs, the indoor fan 5 can be set as a single-speed motor, and its factory default speed is the highest speed under the highest static pressure to achieve maximum circulation volume to drive air flow in the indoor space.

[0192] In some embodiments of the present application, the air conditioner 100 further includes:

[0193] A pressure switch, which is provided at least on the suction and discharge pipes of the compressor 3 and is used to control the flow of refrigerant in the circuit;

[0194] The controller is configured to close the pressure switch to disconnect the circuit when the pressure of the refrigeration system exceeds a preset value.

[0195] By timely controlling the pressure switch disconnection and protection system, damage to important equipment is prevented and production accidents are avoided.

[0196] The following takes the physical duct machine as an example, refer to Table 1 and Table 2, as well as Figures 8-12 , a detailed comparison is made between the effects achieved by the air conditioner under the first signal control (i.e., ordinary commercial air conditioner) and the second signal control. The initial temperature inside the indoor space is 47°C and the set temperature is 10°C.

[0197] Table 1

[0198]

[0199] Table 2

[0200]

[0201] Through Table 1, Figure 8 and Figure 9 As shown, when in the first signal control, the compressor operates at a maximum of 80Hz and reduces the frequency as it approaches the set temperature; when in the second signal control, the compressor directly increases the frequency to 100Hz and operates until it detects that the indoor space temperature reaches the set temperature, and then reduces the frequency to 55Hz to save energy.

[0202] In terms of the speed at which the set temperature was reached in both control modes, under the first signal control, it took 9 hours to drop from the indoor temperature of 47°C to the set temperature of 10°C. Under the second signal control, the air conditioner reached the set temperature in just 5 hours. This shows that when in cooling mode, the air conditioner provided by this application, when used in indoor spaces, achieved a 44% (4 hours) increase in cooling speed compared to conventional commercial air conditioners.

[0203] If the indoor space temperature needs to be maintained at a setpoint of 10°C, the evaporation temperature must promptly leave the antifreeze zone to restore cooling to the indoor space. Under the first signal control, the antifreeze temperature is 3°C; under the second signal control, the antifreeze temperature is 0°C. Table 2 shows the evaporation temperature using the indoor heat exchanger coil temperature.

[0204] According to Table 2, Figure 10-12As shown in the figure, when in the first signal control, after the air conditioner adjusts the room temperature to the set temperature, due to low temperature operation, the inner disk temperature is 0℃, reaching the anti-freeze protection temperature, the air conditioner enters the anti-freeze protection state, and the compressor drops to 55Hz low-frequency operation. Within the next 8 hours, the inner disk temperature of the indoor heat exchanger rises from 0℃ to 3℃, and the evaporating temperature is still in the anti-freeze limit temperature range. The compressor maintains a low-frequency operation of 55Hz, and the air conditioner does not input enough cooling energy to the indoor space, causing the temperature in the greenhouse to slowly rise to 14℃.

[0205] When in the second signal control, after determining that the air conditioner has entered the anti-freeze protection state, the speed of the outdoor fan 4 is reduced and the opening of the expansion valve is adjusted, the internal disk temperature rises to 1°C, so that the evaporation temperature quickly leaves the anti-freeze temperature zone, so that the compressor frequency is increased from 55Hz to 65Hz, increasing the cooling input to the indoor space, and ultimately maintaining the indoor space temperature at the set temperature of 10°C for a long time.

[0206] It can be seen from this that the air conditioner provided in this application can be used in indoor spaces, can maintain the mushroom growth environment, and adapt to market demand.

[0207] This application also proposes an air conditioner with control logic specific to indoor spaces. The air conditioner includes a refrigeration system for exchanging heat with the air inside the indoor space. In this embodiment, the refrigeration cycle is implemented using a compressor, a condenser, an expansion valve, and an evaporator.

[0208] If the indoor space temperature detected by the ambient temperature detection device does not reach the set temperature range, the indoor fan 5 of the air conditioner operates at the upper limit of its operating range, the outdoor fan 4 operates at the upper limit of its operating range, the compressor operates at the highest frequency allowed under various frequency limit protections, and the electronic expansion valve increases the cooling input to the indoor space through exhaust superheat control until the indoor space temperature reaches the set temperature.

[0209] When the air conditioner adjusts the indoor space temperature to reach the set temperature range, the compressor and the outdoor fan 4 operate at the frequency and speed corresponding to the temperature zone to reduce energy consumption.

[0210] If the indoor space temperature detected by the ambient temperature detection device fluctuates compared with the previous detection interval and the allowable temperature fluctuation range is a preset value, the temperature is adjusted according to the fluctuation value of the temperature increase or decrease.

[0211] Specifically, if the indoor space temperature rises to exceed the allowable fluctuation range, it is determined whether the air conditioner is in the anti-freeze state. If it is in the anti-freeze state, the speed of the outdoor fan 4 is reduced and the expansion valve is opened to the maximum opening to release the anti-freeze state, so that the compressor frequency can be increased to the maximum frequency allowed under various frequency limit protections to increase the cooling input to the indoor space, thereby reducing the increased temperature and restoring it to the set temperature range.

[0212] The above solution can meet the demand for long-term stable low temperature in indoor space on the basis of existing air conditioners by improving the control logic alone. At the same time, a control logic is set up to reduce the requirements for the air conditioner controller, reduce costs, and make it easier to promote and apply.

[0213] refer to Figure 13 The following uses an air conditioner having two sets of control logic as an example to illustrate the control logic of the air conditioner in the embodiment of the present application.

[0214] Obtaining indoor space temperature and air conditioning set temperature (step S1301);

[0215] Under the control logic of the second signal, the air conditioner is controlled to operate so that the indoor space temperature reaches the set temperature (step S1308);

[0216] Within the first preset time range, the indoor space temperature rises by the first preset temperature (step S1312), and it is determined whether the coil temperature of the indoor heat exchanger reaches the anti-freeze threshold (step S1309);

[0217] In step S1309, if the coil temperature of the indoor heat exchanger reaches the anti-freeze threshold, it is determined that the air conditioner is in the anti-freeze state. Then, step S1310 is executed to reduce the speed of the outdoor fan 4, operate the indoor fan 5 at the first speed, and open the expansion valve 6 to the first opening degree to release the anti-freeze state.

[0218] Determine whether the coil temperature of the internal heat exchanger reaches the anti-freeze threshold (step S1313);

[0219] In step S1313, if the coil temperature of the indoor heat exchanger reaches the anti-freezing threshold, step S1313 or step S1310 is executed;

[0220] In step S1313, if the coil temperature of the indoor heat exchanger does not reach the anti-freeze threshold, step S1314 is executed, where the compressor 3 is increased to the first frequency, the outdoor fan 4 is operated at the second speed, the indoor fan 5 is operated at the first speed, and the opening of the expansion valve 6 is controlled by the exhaust superheat. This increases the cooling input to the indoor space to reduce the elevated temperature in the indoor space.

[0221] For example, the outdoor fan 4 is reduced by 50r every minute until the anti-freeze state is released; the expansion valve is opened to the first opening and maintained for 1 minute, and then the exhaust superheat control is restored;

[0222] In step S1309, if the coil temperature of the indoor heat exchanger does not reach the anti-freeze threshold, step S1311 is executed, the compressor 3 operates at the first frequency, the indoor fan 5 operates at the first speed, the outdoor fan 4 operates at the second speed, and the opening of the expansion valve 6 is controlled by the exhaust superheat.

[0223] By changing the operating frequency of the compressor 3 and controlling the operating speeds of the indoor fan 5 and the outdoor fan 4, when the temperature of the indoor space rises in the warm state, the cooling input to the indoor space is directly increased to compensate for the increased temperature in the indoor space, so that the temperature of the indoor space is reduced to the upper limit of the set temperature range, thereby meeting the external environment required for the growth of mushrooms.

[0224] In the above steps, by collaboratively controlling the outdoor fan 4 and the expansion valve 6 in a short period of time, the evaporation temperature (here refers to the coil temperature of the indoor heat exchanger) is rapidly released from the anti-freezing temperature zone, thereby increasing the frequency of the compressor 3 and ultimately increasing the cooling load input of the air conditioner to the indoor space, thereby maintaining the temperature in the indoor space within the set temperature range and ensuring a good environment for mushroom growth.

[0225] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0226] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to preferred embodiments, persons skilled in the art should understand that the specific implementation methods of the present invention may still be modified or some technical features may be replaced by equivalents without departing from the spirit of the technical solutions of the present invention, and all of these should fall within the scope of the technical solutions claimed for protection by the present invention.

Claims

1. An air conditioner, characterized in that: include: an indoor unit, which is installed in the indoor space; a refrigerant circulation circuit in which refrigerant circulates sequentially through a compressor, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; an indoor fan, configured to drive indoor air to exchange heat with the indoor heat exchanger and then be delivered from an air outlet, wherein the upper limit of the operating speed range of the indoor fan is defined as a first speed; an outdoor fan, configured to drive outdoor air to perform heat exchange with the outdoor heat exchanger, wherein the upper limit of the operating speed range of the outdoor fan is defined as a second speed; The expansion valve is configured to control the flow rate of the refrigerant from the outdoor heat exchanger to the indoor heat exchanger by adjusting its own opening during cooling operation, and the maximum opening of the expansion valve is defined as a first opening; The highest allowable operating frequency of the compressor under frequency limiting protection is defined as a first frequency; An ambient temperature detection device is installed in the indoor space and is used to detect the temperature of the indoor space; The controller is configured to: obtain the indoor space temperature, and when the indoor space temperature reaches a set temperature, if the indoor space temperature rises by a first preset temperature within a first preset time range, determine whether the air conditioner is in an anti-freeze state; If the air conditioner is in an anti-freeze state, the rotation speed of the outdoor fan is reduced, the indoor fan is operated at a first rotation speed, and the expansion valve is opened to a first opening degree to release the anti-freeze state; After the anti-freeze state is released, the compressor is increased to the first frequency, the outdoor fan is operated at the second speed, the indoor fan is operated at the first speed, the opening of the expansion valve is controlled by the exhaust superheat, and the cooling input to the indoor space is increased to reduce the increased temperature in the indoor space.

2. The air conditioner according to claim 1, characterized in that The controller is further configured to: After the indoor space temperature reaches the set temperature, within a first preset time range, when the indoor space temperature rises by the first preset temperature, if the air conditioner is not in an anti-freeze state, the compressor operates at a first frequency, the indoor fan operates at a first speed, the outdoor fan operates at a second speed, and the opening of the expansion valve is controlled by the exhaust gas superheat to directly increase the cooling input to the indoor space to compensate for the increased temperature in the indoor space.

3. The air conditioner according to claim 1, characterized in that The controller is further configured to: After the indoor space temperature reaches the set temperature, within a first preset time range, if the indoor space temperature drops by the first preset temperature, the compressor frequency is reduced to a preset compressor frequency range, the indoor fan operates at a first speed, the speed of the outdoor fan reaches at least a lower speed limit corresponding to the current ambient temperature range, and the opening of the expansion valve is controlled by the exhaust superheat to reduce the cooling input to the indoor space to increase the lowered temperature in the indoor space.

4. The air conditioner according to claim 1, characterized in that The controller is further configured to: After the indoor space temperature reaches the set temperature, if the indoor space temperature drops by a second preset temperature within a second preset time range, the compressor stops running. After a preset time, when the indoor space temperature reaches at least the difference between the set temperature and the first preset temperature, the compressor is restarted to resume cooling input to the indoor space.

5. The air conditioner according to claim 1, characterized in that The controller is further configured to: After the indoor space temperature reaches the set temperature, within a first preset time range, if the indoor space temperature does not rise or fall by the first preset temperature, the indoor fan operates at a first speed, the speed of the outdoor fan at least reaches a speed lower limit corresponding to the current ambient temperature zone, the compressor operating frequency at least reaches a frequency lower limit corresponding to the current ambient temperature zone, and the expansion valve opening is controlled by the exhaust superheat.

6. The air conditioner according to any one of claims 1 to 5, characterized in that: The controller is further configured to: If the indoor space temperature does not reach the set temperature, the indoor fan operates at a first speed, the outdoor fan operates at a second speed, the compressor operates at a first frequency, and the expansion valve opening is controlled by the exhaust superheat to increase the cooling / heating load input of the air conditioner to the indoor space.

7. The air conditioner according to any one of claims 1 to 5, characterized in that: The controller further comprises: When the first signal is received, the evaporator anti-freezing temperature is configured as a first anti-freezing temperature; When the second signal is received, the evaporator anti-freezing temperature is configured as a second anti-freezing temperature; In which, the second anti-freezing temperature is lower than the first anti-freezing temperature, so that the lowest temperature that the evaporator can reach under the control of the second signal is lower than the lowest temperature that the evaporator can reach under the control of the first signal, so that the air conditioner can output a lower temperature airflow when receiving the second signal than when receiving the first signal.

8. The air conditioner according to any one of claims 1 to 5, characterized in that: The controller further comprises: When the first signal is received, the evaporator overload prevention temperature is configured as a first overload prevention temperature; When the second signal is received, the evaporator overload prevention temperature is configured to be a second overload prevention temperature; In which, the second overload prevention temperature is greater than the first overload prevention temperature, so that the maximum temperature that the evaporator can reach under the control of the second signal is higher than the maximum temperature that the evaporator can reach under the control of the first signal, so that the air conditioner can output a higher temperature airflow when receiving the second signal than when the air conditioner receives the first signal.

9. The air conditioner according to any one of claims 1 to 5, characterized in that: Also includes: A plurality of sensors are provided on the compressor, condenser, evaporator and other connecting pipes of the air conditioner to detect the operation of the corresponding components, the temperature of the corresponding components and the humidity at the corresponding positions; A pressure switch, which is provided at least on the suction pipe and the exhaust pipe of the compressor and is used to control the flow of refrigerant in the circuit; The controller is configured to close the pressure switch to disconnect the circuit when the pressure of the refrigeration system exceeds a preset value.

10. An air conditioner, characterized in that: include: an indoor unit, which is installed in the indoor space; a refrigerant circulation circuit in which refrigerant circulates sequentially through a compressor, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; an indoor fan, configured to drive indoor air to exchange heat with the indoor heat exchanger and then be delivered from an air outlet, wherein the upper limit of the operating speed range of the indoor fan is defined as a first speed; an outdoor fan, configured to drive outdoor air to perform heat exchange with the outdoor heat exchanger, wherein the upper limit of the operating speed range of the outdoor fan is defined as a second speed; The expansion valve is configured to control the flow rate of the refrigerant from the outdoor heat exchanger to the indoor heat exchanger by adjusting its own opening during cooling operation, and the maximum opening of the expansion valve is defined as a first opening; The highest allowable operating frequency of the compressor under frequency limiting protection is defined as a first frequency; An ambient temperature detection device is installed in the indoor space and is used to detect the temperature of the indoor space; The controller is configured as: Acquiring the indoor space temperature; After receiving the first signal, the air outlet temperature of the air conditioner can reach the first air outlet temperature range; When the second signal is received, the air outlet temperature of the air conditioner may reach a second air outlet temperature range, wherein at least a lower limit of the second air outlet temperature range is lower than a lower limit of the first air outlet temperature range; and at least the following steps may be performed: After receiving the second signal and after the indoor space temperature reaches the set temperature, if the indoor space temperature rises by a first preset temperature within a first preset time range, determining whether the air conditioner is in an anti-freeze state; If the air conditioner is in an anti-freeze state, the rotation speed of the outdoor fan is reduced, the indoor fan is operated at a first rotation speed, and the expansion valve is opened to a first opening degree to release the anti-freeze state; After the anti-freeze state is released, the compressor is increased to the first frequency, the outdoor fan is operated at the second speed, the indoor fan is operated at the first speed, and the opening of the expansion valve is controlled by the exhaust superheat to increase the cooling input to the indoor space to reduce the increased temperature in the indoor space.

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