Combined air conditioner

Abstract

The invention discloses a combined type air conditioner which comprises an air supply section, a heat exchange section and a heat exchange section. The control module is configured to start the static pressure recognition function, and the rotating speed and the power value corresponding to the first set static pressure value are obtained to serve as the current target rotating speed and the current target power value; the fan is controlled to operate at the current target rotating speed; judging whether the absolute value of the difference value between the actual power value and the current target power value meets a preset condition or not; if not, increasing / decreasing the set rotating speed on the basis of the current target rotating speed to serve as a new current target rotating speed, and obtaining a current target power value corresponding to the new current target rotating speed; the rotating speed of the fan is adjusted, the fan is controlled to operate at the new current target rotating speed, and whether the absolute value of the difference value between the actual power value of the fan and the current target power value meets the preset condition or not is judged again; and if yes, the static pressure value corresponding to the current target power value serves as the air conditioner static pressure. According to the combined air conditioner, the technical problem that in the prior art, the static pressure recognition function is not achieved is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and particularly to a modular air conditioner. Background Art

[0002] A modular air conditioning unit is an air handling device assembled from various air handling function sections. The modular air conditioning unit includes a mixing section, a filtering section, a cooling coil section, a hot water / steam coil section, a humidifying section, a spray section, a heat recovery section, a fan section, a flow equalizing section, a sound insulation section, etc. The modular air conditioning unit is a fully air handling product developed to meet the usage requirements of various occasions such as ordinary air conditioning, industrial workshops, exhibition halls, and medical purification.

[0003] Currently, most modular air conditioners are equipped with fixed-frequency motors with corresponding powers according to their rated air volumes and cannot adjust the air volume.

[0004] For modular air conditioners in a few occasions with higher requirements, variable-frequency motors are equipped to adjust the wind speed. When the static pressure inside the modular air conditioner cabinet or in the air supply duct changes, the variable-frequency motor can adjust the frequency to change the wind speed so that the air supply volume reaches the rated value. The basic principle of its adjustment is to default that the size of the air supply outlet is a fixed value and only adjust the wind speed to meet the constant air volume requirement. This way of achieving constant air volume requires the unit to be equipped with an expensive wind speed sensor.

[0005] Currently, there is no modular air conditioning product that realizes constant air volume through automatic static pressure identification. Summary of the Invention

[0006] The present invention provides a modular air conditioner, which solves the technical problem of the lack of static pressure identification function in the prior art.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] The present invention provides a modular air conditioner, including:

[0009] An air supply section, which has a fan inside;

[0010] A control module, which is configured to:

[0011] Start the static pressure identification function, obtain the rotation speed and power value corresponding to the first set static pressure value as the current target rotation speed and the current target power value;

[0012] Control the fan to operate at the current target rotation speed; judge whether the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition;

[0013] If not satisfied, increase or decrease the set speed on the basis of the current target speed as the new current target speed, and obtain the current target power value corresponding to the new current target speed; adjust the fan speed, control the fan to operate at the new current target speed, and re-determine whether the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition;

[0014] If satisfied, the static pressure identification is completed, and the static pressure value corresponding to the current target power value is used as the air conditioner static pressure.

[0015] In some embodiments of the present application, the control module is further configured to:

[0016] Before determining whether the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition, it further includes:

[0017] Determine whether the actual power value exceeds the current target power value;

[0018] If the actual power value exceeds the current target power value, obtain the speed and power value corresponding to the second set static pressure value as the current target speed and the current target power value; control the fan to operate at the current target speed, and then determine whether the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition;

[0019] If the actual power value does not exceed the current target power value, directly determine whether the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition;

[0020] Wherein, the second set static pressure value is greater than the first set static pressure value.

[0021] In some embodiments of the present application, the control module is further configured to:

[0022] Calculate k1×|ΔP|; where k1 is the speed adjustment coefficient; ΔP is the difference between the actual power value and the current target power value;

[0023] When k1×|ΔP| is within the set range, the set speed = k1×|ΔP|;

[0024] When k1×|ΔP| exceeds the upper limit value of the set range, the set speed = the upper limit value of the set range; the upper limit value of the set range is determined according to the number of positive and negative switching times of ΔP;

[0025] When k1×|ΔP| is lower than the lower limit value of the set range, the set speed = the lower limit value of the set range.

[0026] In some embodiments of the present application, the upper limit value of the set range = k2 / (k3×n + k4);

[0027] Wherein, n is the number of positive and negative switches of ΔP; k2, k3, and k4 are all constants greater than 0.

[0028] In some embodiments of the present application, when any of the following conditions is met, it is determined that the preset condition is satisfied:

[0029] (1), |(Pz - Ph) / Ph| does not exceed the first set ratio;

[0030] (2), |(Pz - Ph) / Ph| does not exceed the second set ratio, and the number of speed regulation times m is not less than the first set number;

[0031] (3), |Pz - Ph| does not exceed the set difference;

[0032] Wherein, Pz is the actual power value of the fan, and Ph is the current target power value; the first set ratio is less than the second set ratio.

[0033] In some embodiments of the present application, when any of the following conditions is met, it is determined that the preset condition is satisfied:

[0034] (1), |(Pz - Ph) / Ph| does not exceed the first set ratio;

[0035] (2), |(Pz - Ph) / Ph| does not exceed the second set ratio, and the number of speed regulation times m is not less than the first set number;

[0036] (3), |Pz - Ph| does not exceed the set difference;

[0037] (4), the number of speed regulation times m is not less than the second set number;

[0038] Wherein, Pz is the actual power value of the fan, and Ph is the current target power value; the first set ratio is less than the second set ratio; the first set number is less than the second set number.

[0039] In some embodiments of the present application, the control module is further configured to:

[0040] Preset the corresponding relationship between the static pressure value - fan speed - fan power value under constant air volume;

[0041] According to the corresponding relationship, obtain the speed and power values corresponding to the first set static pressure value.

[0042] In some embodiments of the present application, a remote controller / line controller is used to send a static pressure identification function start signal to the control module, and the identified air conditioner static pressure is displayed after the static pressure identification is completed.

[0043] In some embodiments of the present application, the control module is further configured to:

[0044] Judge whether the inside of the air conditioner or the air supply duct is blocked or damaged according to the identified static pressure of the air conditioner.

[0045] In some embodiments of the present application, the control module is further configured to:

[0046] When the air conditioner is installed and completed, start the static pressure identification function, and the identified static pressure of the air conditioner is P1;

[0047] After a set time period, start the static pressure identification function, and the identified static pressure of the air conditioner is P2;

[0048] If P1 is lower than P2, it is determined that there is a blockage inside the air conditioner or in the air supply duct;

[0049] If P1 is higher than P2, it is determined that there is damage inside the air conditioner or in the air supply duct.

[0050] The technical solution of the present invention has the following technical effects compared with the prior art: The combined air conditioner of the present invention has a static pressure automatic identification function. When the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition, the static pressure identification is completed, and the static pressure value corresponding to the current target power value is the static pressure of the air conditioner; when the absolute value of the difference between the actual power value of the fan and the current target power value does not meet the preset condition, adjust the fan speed and re-judge whether it meets the preset condition. The combined air conditioner of this embodiment has a static pressure automatic identification function, realizes automatic static pressure identification, and can achieve constant air volume control without setting an air speed sensor, solving the technical problems that the combined air conditioner in the prior art does not have a static pressure identification function and cannot automatically identify the static pressure.

[0051] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0053] Figure 1 It is a schematic structural diagram of an embodiment of the combined air conditioner of the present invention;

[0054] Figure 2 It is a schematic diagram of an embodiment of an equal air volume curve, an equal static pressure curve, and an equal air duct curve;

[0055] Figure 3 It is a flowchart of an embodiment of the steps executed by the control module of the combined air conditioner of the present invention;

[0056] Figure 4 Flow chart of another embodiment of the execution steps of the control module of the modular air conditioner of the present invention;

[0057] Figure 5 Flow chart of another embodiment of the execution steps of the control module of the modular air conditioner of the present invention;

[0058] Figure 6 Flow chart of another embodiment of the execution steps of the control module of the modular air conditioner of the present invention;

[0059] Figure 7 Flow chart of another embodiment of the execution steps of the control module of the modular air conditioner of the present invention;

[0060] Figure 8 Flow chart of another embodiment of the execution steps of the control module of the modular air conditioner of the present invention;

[0061] Figure 9 Flow chart of another embodiment of the execution steps of the control module of the modular air conditioner of the present invention;

[0062] Figure 10 Flow chart of another embodiment of the execution steps of the control module of the modular air conditioner of the present invention.

[0063] Reference numerals:

[0064] 11, mixing section; 11-1, fresh air inlet; 11-2, return air inlet;

[0065] 12, filtration section; 13, surface cooling section; 14, humidification section; 15, sound insulation section; 16, maintenance section;

[0066] 17, air supply section; 17-1, air supply outlet; 17-2, fan;

[0067] 20, air supply duct. Detailed implementation manners

[0068] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0069] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 thus should not be construed as a limitation to the present application.

[0070] The terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0071] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0072] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0073] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0074] The air conditioner performs the refrigeration cycle and the heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator, and is controlled by a controller to achieve control of the refrigerant flow direction and the opening degree of the expansion valve, etc. The refrigeration cycle and the heating cycle include a series of processes, involving compression, condensation, expansion, and evaporation, and supplying the refrigerant to the air that has been conditioned and heat-exchanged.

[0075] The compressor compresses the refrigerant gas in a high-temperature and high-pressure state 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 heat is released to the surrounding environment through the condensation process.

[0076] The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant for heat exchange with the material to be cooled. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0077] The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger, the indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in the outdoor unit or the indoor unit of the air conditioner.

[0078] The indoor heat exchanger and the outdoor heat exchanger serve as condensers or evaporators. When the indoor heat exchanger serves as a condenser, the air conditioner serves as a heater in the heating mode, and when the indoor heat exchanger serves as an evaporator, the air conditioner serves as a cooler in the refrigeration mode.

[0079] The combined air conditioner of this embodiment includes a mixing section 11, a surface cooling section 13, a air supply section 17, a control module, etc., as shown in Figure 1 shown.

[0080] The mixing section 11 has a fresh air inlet 11-1 and / or a return air inlet 11-2. Outdoor fresh air enters the mixing section 11 through the fresh air inlet 11-1, and indoor return air enters the mixing section 11 through the return air inlet 11-2. Both the fresh air inlet 11-1 and the return air inlet 11-2 can be opened or closed. When both the fresh air inlet 11-1 and the return air inlet 11-2 are opened, the mixing section 11 mixes the incoming outdoor fresh air and indoor return air.

[0081] The surface cooling section 13 is communicated with the mixing section 11. The surface cooling section 13 is used to cool or heat the flowing air stream.

[0082] The air supply section 17 is connected to the surface cooler section 13. The air supply section 17 has an air supply opening 17-1 for supplying air into the room. There is a fan 17-2 in the air supply section 17. When the fan 17-2 rotates, it drives the air flow to blow into the room through the air supply opening 17-1.

[0083] In some embodiments of the present application, the air supply opening 17-1 of the air supply section 17 is connected to the air supply duct 20. The air flow in the air supply section 17 blows into the air supply duct 20 through the air supply opening 17-1 and is conveyed to the room through the air supply duct 20.

[0084] In some embodiments of the present application, a filter section 12 is further provided between the mixing section 11 and the surface cooler section 13 for filtering the air flow.

[0085] In some embodiments of the present application, a humidifying section 14 is further provided between the surface cooler section 13 and the air supply section 17. The humidifying section 14 is used for humidifying the air flow.

[0086] In some embodiments of the present application, a silencing section 15 is further provided between the humidifying section 14 and the air supply section 17. The silencing section 15 is used for eliminating noise.

[0087] In some embodiments of the present application, a maintenance section 16 is further provided between the silencing section 15 and the air supply section 17. The maintenance section 16 is used for maintaining the packaged air conditioner.

[0088] Therefore, the packaged air conditioner includes a mixing section 11, a filter section 12, a surface cooler section 13, a humidifying section 14, a silencing section 15, a maintenance section 16, and an air supply section 17 arranged in sequence along the air flow direction. Each functional section performs corresponding functional processing on the air.

[0089] Fresh air and return air enter the mixing section 11 for mixing. The mixed gas is filtered by the filter section 12, cooled or heated by the surface cooler section 13, humidified by the humidifying section 14, silenced by the silencing section 15, enters the air supply section 17 through the maintenance section 16, and then is sent into the air supply duct 20 by the fan 17-2 and conveyed into the room through the air supply duct 20.

[0090] For a fixed fan, the five curves of equal air volume curve, equal static pressure curve, equal air duct curve, equal rotation speed curve, and equal power curve are known and clear on a graph with rotation speed as the abscissa and power as the ordinate. Refer to Figure 2 as shown. The above-mentioned fitting curves can be made through experiments.

[0091] Figure 2 Among them, 1-1, 1-2, and 1-3 are three equal static pressure curves; 2-1, 2-2, and 2-3 are three equal air volume curves; 3-1 and 3-2 are two equal air duct curves.

[0092] Through experiments, the equal air volume curve is fitted to identify the corresponding relationship between rotation speed and power at equal air volume.

[0093] A control module for controlling the operation of the entire combined air conditioner.

[0094] The control module is configured to:

[0095] Start the static pressure identification function, obtain the rotational speed and power value corresponding to the first set static pressure value as the current target rotational speed and current target power value;

[0096] Control the fan to rotate at the current target rotational speed; determine whether the absolute value of the difference between the actual power value of the fan and the current target power value meets a preset condition;

[0097] If not, increase / decrease the set rotational speed on the basis of the current target rotational speed as the new current target rotational speed, obtain the current target power value corresponding to the new current target rotational speed; adjust the fan rotational speed, control the fan to rotate at the new current target rotational speed, and re-determine whether the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition;

[0098] If it meets, the static pressure identification is completed, and the static pressure value corresponding to the current target power value is used as the air conditioner static pressure.

[0099] Therefore, the control module executes the following steps, as shown in Figure 3 shown.

[0100] Step S11: Start the static pressure identification function and enter the static pressure automatic identification mode. Obtain the rotational speed and power value corresponding to the first set static pressure value as the current target rotational speed and current target power value.

[0101] Under the same air volume, there is a corresponding relationship among static pressure, fan rotational speed, and fan power.

[0102] Preset the corresponding relationship of static pressure - fan rotational speed - fan power value under constant air volume. This corresponding relationship can be represented by a corresponding table, which is called the constant air volume table.

[0103] Take the rotational speed corresponding to the first set static pressure value as the current target rotational speed;

[0104] Take the power value corresponding to the first set static pressure value as the current target power value.

[0105] Step S12: Control the fan to rotate at the current target rotational speed.

[0106] After controlling the fan to rotate at the current target rotational speed for a set duration, then execute the following step S13.

[0107] Step S13: Obtain the actual power value of the fan.

[0108] Step S14: Calculate the absolute value of the difference between the actual power value of the fan and the current target power value.

[0109] Step S15: Determine whether the absolute value of the difference meets a preset condition (the static pressure self-identification success determination condition).

[0110] If it meets the condition, the static pressure identification is completed, and step S16 is executed: Use the static pressure value corresponding to the current target power value as the air conditioner static pressure. After the static pressure identification is completed, exit the static pressure automatic identification mode and turn off the static pressure identification function. The fan operates at the speed corresponding to the identified air conditioner static pressure.

[0111] If it does not meet the condition, execute step S17: Increase or decrease the set speed based on the current target speed as the new current target speed.

[0112] If the actual power value is greater than the current target power value, decrease the set speed based on the current target speed as the new current target speed. The purpose is to reduce the fan speed.

[0113] If the actual power value is less than the current target power value, increase the set speed based on the current target speed as the new current target speed. The purpose is to increase the fan speed.

[0114] Step S18: Obtain the current target power value corresponding to the new current target speed.

[0115] Query the constant air volume table to obtain the current target power value corresponding to the new current target speed.

[0116] Step S19: Adjust the fan speed to control the fan to operate at the new current target speed, increment the number of speed adjustment times m by 1, obtain the actual power value of the fan, then return to step S14, recalculate the absolute value of the difference between the actual power value and the current target power value of the fan, and determine whether the absolute value of the difference meets the preset condition.

[0117] The modular air conditioner of this embodiment has a static pressure automatic identification function. When the absolute value of the difference between the actual power value and the current target power value of the fan meets the preset condition, the static pressure identification is completed, and the static pressure value corresponding to the current target power value is the air conditioner static pressure; when the absolute value of the difference between the actual power value and the current target power value of the fan does not meet the preset condition, adjust the fan speed and re-determine whether it meets the preset condition. The modular air conditioner of this embodiment realizes static pressure automatic identification, can achieve constant air volume control without setting a wind speed sensor, and solves the technical problem in the prior art that the modular air conditioner does not have a static pressure identification function and cannot automatically identify the static pressure.

[0118] The modular air conditioner of this embodiment is more complex in structure compared with the duct machine. The static pressure identified by using the static pressure automatic identification function is the total static pressure, including the static pressure inside the modular air conditioner box and the static pressure of the air supply duct outside the box.

[0119] In some embodiments of the present application, in order to improve the accuracy of static pressure identification, the control module is further configured to:

[0120] Before determining whether the absolute value of the difference between the actual power value and the current target power value of the fan satisfies a preset condition, it further includes:

[0121] Determine whether the actual power value exceeds the current target power value;

[0122] If the actual power value exceeds the current target power value, obtain the rotational speed and power value corresponding to the second set static pressure value as the current target rotational speed and current target power value; control the fan to operate at the current target rotational speed, and then determine whether the absolute value of the difference between the actual power value and the current target power value of the fan satisfies the preset condition;

[0123] If the actual power value does not exceed the current target power value, directly determine whether the absolute value of the difference between the actual power value and the current target power value of the fan satisfies the preset condition;

[0124] Wherein, the second set static pressure value is greater than the first set static pressure value.

[0125] Therefore, between step S13 and step S14, the following steps are further executed, see Figure 4 as shown.

[0126] Step S21: Determine whether the actual power value exceeds the current target power value.

[0127] If the actual power value does not exceed the current target power value, directly execute step S14.

[0128] If the actual power value exceeds the current target power value, it indicates that the first set static pressure value is small, then execute step S22.

[0129] Step S22: Query the constant air volume table, obtain the rotational speed and power value corresponding to the second set static pressure value as the current target rotational speed and current target power value; control the fan to operate at the current target rotational speed, and obtain the actual power value of the fan. Then execute step S14.

[0130] By designing steps S21 - S22, if the actual power value is greater than the current target power value, it indicates that the first set static pressure value is small, and a larger static pressure value needs to be re - selected, that is, select the second set static pressure value, query the constant air volume table, and use the rotational speed and power value corresponding to the second set static pressure value as the current target rotational speed and current target power value to improve the static pressure identification speed.

[0131] For a DC motor, the electric control can obtain the fan speed and the corresponding power. However, the air duct, static pressure, and air volume are all unknown. By using the equal air volume curve (it is necessary to first make a fitting curve through experiments to identify the corresponding relationship between the speed and power under equal air volume), continuously try with the speed. When the actual power and the target power are gradually less than a certain set deviation, it is determined that the target speed is reached, and the static pressure automatic recognition function can be realized. The constant air volume can be achieved without equipping a wind speed sensor.

[0132] When querying the current target power value corresponding to the current target speed in the constant air volume table, if the current target speed is not found in the constant air volume table, find the speed closest to the current target speed, and then find the power value corresponding to that speed as the current target power value.

[0133] In some embodiments of the present application, the control module is further configured to execute the following steps, see Figure 5 as shown.

[0134] Step S31: Preset the corresponding relationship between the static pressure value - fan speed - fan power value under constant air volume.

[0135] This corresponding relationship is the corresponding relationship between different static pressure values and the fan speed and fan power. This corresponding relationship is a corresponding table, which can be called a constant air volume table.

[0136] Step S32: According to the corresponding relationship, obtain the speed and power value corresponding to the first set static pressure value.

[0137] By presetting the corresponding relationship between the static pressure value, fan speed, and fan power value under constant air volume (a fixed rated air volume), and then querying this corresponding relationship, directly obtain the speed and power value corresponding to the first set static pressure value or the second set static pressure value, which is simple, convenient, accurate, and rapid.

[0138] In some embodiments of the present application, the first set static pressure value is the intermediate static pressure value in the constant air volume table; the second set static pressure value is the maximum static pressure value in the constant air volume table.

[0139] In some embodiments of the present application, the control module is further configured to execute the following steps, see Figure 6 as shown.

[0140] Step S41: Calculate the value of k1×|ΔP|.

[0141] In this step, calculate the product of k1 and |ΔP|.

[0142] Wherein, k1 is the speed adjustment coefficient. K1 is a constant greater than 0. For example, k1 = 1.

[0143] ΔP is the difference between the actual power value Pz and the current target power value Ph. ΔP = Pz - Ph.

[0144] Step S42: Determine the value of the set rotational speed ΔRPM according to the relationship between the value of k1×|ΔP| and the set range.

[0145] (1) When k1×|ΔP| is within the set range, the set rotational speed ΔRPM = k1×|ΔP|.

[0146] The larger |ΔP| is, the larger the value of the set rotational speed ΔRPM is, and the larger the step of rotational speed adjustment is, so as to accelerate the static pressure identification speed.

[0147] (2) When k1×|ΔP| exceeds the upper limit value of the set range, the set rotational speed ΔRPM = the upper limit value of the set range, so as to avoid too large a step of rotational speed adjustment. The upper limit value of the set range is determined according to the number of positive and negative switching times of ΔP.

[0148] (3) When k1×|ΔP| is lower than the lower limit value of the set range, the set rotational speed ΔRPM = the lower limit value of the set range, so as to avoid too small a step of rotational speed adjustment.

[0149] Therefore, first calculate the product of k1 and |ΔP|, then compare the magnitude relationship between k1×|ΔP| and the upper limit value and the lower limit value of the set range, and finally determine the set rotational speed ΔRPM.

[0150] By designing the above steps S41 - S42, the set rotational speed ΔRPM is restricted between the upper limit value and the lower limit value of the set range, ensuring an appropriate step of rotational speed adjustment and avoiding overshoot.

[0151] In some embodiments of the present application, the upper limit value of the set range = k2 / (k3×n + k4).

[0152] Wherein, n is the number of positive and negative switching times of ΔP; k2, k3, and k4 are all constants greater than 0.

[0153] It can be seen from this formula that the larger the number of positive and negative switching times n of ΔP is, the smaller the upper limit value of the set range is, and the smaller the upper limit of the set rotational speed ΔRPM is, so as to avoid too large a step of adjustment after multiple rotational speed adjustments.

[0154] The number of positive and negative switching times n is cleared when the static pressure identification function is started.

[0155] In some embodiments of the present application, k2 = 60, k3 = 2, k4 = 1, that is, the upper limit value of the set range = 60 / (2n + 1).

[0156] In some embodiments of the present application, the lower limit value of the set range = 8.

[0157] For example, the initial value of n is 0;

[0158] When calculating ΔP for the first time, ΔP > 0, and at this time n = 0;

[0159] When calculating ΔP for the second time, ΔP < 0, and at this time n = 1;

[0160] When calculating ΔP for the third time, ΔP > 0, and at this time n = 2;

[0161] When calculating ΔP for the fourth time, ΔP > 0, and at this time n = 2;

[0162] When calculating ΔP for the fifth time, ΔP < 0, and at this time n = 3; and so on.

[0163] By setting the number of positive and negative switches n, the upper limit value of the set range can be changed according to the magnitude relationship between the actual power and the target power, preventing overshoot.

[0164] In some embodiments of the present application, when any of the following conditions is met, it is determined that the preset condition is met.

[0165] (1), |(Pz - Ph) / Ph| does not exceed the first set ratio a%;

[0166] (2), |(Pz - Ph) / Ph| does not exceed the second set ratio b%, and the number of speed regulation times m is not less than the first set number C;

[0167] (3), |Pz - Ph| does not exceed the set difference Po.

[0168] Among them, Pz is the actual power value of the fan, Ph is the current target power value; the first set ratio a% is less than the second set ratio b%.

[0169] If |(Pz - Ph) / Ph| ≤ the first set ratio a%, it means that the ratio of the difference between the actual power value and the current target power value to the current target power value is small, and it can be accurately determined that the preset condition is met, and the static pressure identification is completed.

[0170] If |(Pz - Ph) / Ph| ≤ the second set ratio b%, and the number of speed regulation times m ≥ the first set number C, it means that the ratio of the difference between the actual power value and the current target power value to the current target power value is small, and the number of speed regulation times is large, and it can be accurately determined that the preset condition is met, and the static pressure identification is completed.

[0171] If |Pz - Ph| ≤ the set difference Po, it means that the difference between the actual power value and the current target power value is small, and it can be accurately determined that the preset condition is met, and the static pressure identification is completed.

[0172] The number of speed regulation times m is cleared when the static pressure identification function is started.

[0173] In some other embodiments of the present application, when any of the following conditions is met, it is determined that the preset condition is satisfied.

[0174] (1), |(Pz - Ph) / Ph| does not exceed the first set ratio a%;

[0175] (2), |(Pz - Ph) / Ph| does not exceed the second set ratio b%, and the number of speed regulation times m is not less than the first set number C;

[0176] (3), |Pz - Ph| does not exceed the set difference Po;

[0177] (4), the number of speed regulation times m is not less than the second set number D.

[0178] Wherein, Pz is the actual power value of the fan, and Ph is the current target power value; the first set ratio a% is less than the second set ratio b%; the first set number C is less than the second set number D.

[0179] If |(Pz - Ph) / Ph| ≤ the first set ratio a%, it indicates that the ratio of the difference between the actual power value and the current target power value to the current target power value is small, and thus it can be accurately determined that the preset condition is satisfied and the static pressure identification is completed.

[0180] If |(Pz - Ph) / Ph| ≤ the second set ratio b%, and the number of speed regulation times m ≥ the first set number C, it indicates that the ratio of the difference between the actual power value and the current target power value to the current target power value is small, and the number of speed regulation times is large, and thus it can be accurately determined that the preset condition is satisfied and the static pressure identification is completed.

[0181] If |Pz - Ph| ≤ the set difference Po, it indicates that the difference between the actual power value and the current target power value is small, and thus it can be accurately determined that the preset condition is satisfied and the static pressure identification is completed.

[0182] If the number of speed regulation times m ≥ the second set number D, it indicates that the number of speed regulation times is large, and thus it can be accurately determined that the preset condition is satisfied and the static pressure identification is completed.

[0183] In some embodiments of the present application, the specific values of a, b, C, D, and Po can be set according to the actual situation.

[0184] Therefore, the control module specifically executes the following steps, as shown in Figure 7 shown.

[0185] Step S51: Determine whether any of the conditions |(Pz - Ph) / Ph| ≤ a%, |(Pz - Ph) / Ph| ≤ b% and the number of speed regulation times ≥ C, |Pz - Ph| ≤ Po, the number of speed regulation times ≥ D is satisfied.

[0186] If any of the above conditions is satisfied, step S52 is executed: It is determined that the preset condition is satisfied and the static pressure identification is completed.

[0187] Next, in combination with Figure 8 The specific implementation process of the static pressure self-identification will be specifically described.

[0188] Step S61: Under the condition of the indoor temperature Ti, obtain the corresponding relationship between different static pressure values and the fan speed and fan power at the rated air volume, and make a constant air volume table.

[0189] Step S62: Obtain the speed and power corresponding to the first set static pressure value (the middle static pressure value in the constant air volume table) in the constant air volume table as the current target speed and current target power value; control the fan to run at the current target speed for t1 time, and then measure the actual power value Pz of the motor at this time. Compare this actual power value Pz with the current target power value Ph (that is, the power value Ph corresponding to the first set static pressure value in the constant air volume table).

[0190] If Pz > Ph, it means that the current actual static pressure of the air conditioner is greater than the first set static pressure value, and enter S63; otherwise, enter S64.

[0191] Step S63: Obtain the speed and power corresponding to the second set static pressure value (the maximum static pressure value in the constant air volume table) in the constant air volume table as the current target speed and current target power value; control the fan to run at the current target speed for t2 time, and then measure the actual power value Pz of the motor at this time. Compare this actual power value Pz with the current target power value Ph (that is, the power value Ph corresponding to the second set static pressure value in the constant air volume table), and then execute step S64.

[0192] Step S64: Determine whether the preset condition is satisfied.

[0193] If any of the following conditions is satisfied, that is, it is determined that the preset condition is satisfied, then the static pressure self-identification is completed, that is, it is considered to reach the constant air volume, and the static pressure value corresponding to the current target power value is the identified static pressure of the air conditioner.

[0194] (1), |(Pz - Ph) / Ph| ≤ a%;

[0195] (2), |(Pz - Ph) / Ph| ≤ b%, and the number of speed regulation times ≥ C;

[0196] (3), |Pz - Ph| ≤ Po;

[0197] (4), The number of speed regulation times ≥ D.

[0198] If the preset condition is not satisfied, the fan speed is adjusted, that is, the following step S65 is executed.

[0199] Step S65: If the actual power value > the current target power value, the fan speed decreases by the set speed ΔRPM, i.e., the target speed decreases.

[0200] If the actual power value < the current target power value, the fan speed increases by the set speed ΔRPM, i.e., the target speed increases.

[0201] Step S66: Control the fan to operate at the adjusted target speed, and measure the actual power value of the fan at this time. Obtain the current target power value corresponding to the new current target speed in the constant air volume table. Compare this actual power value with the current target power value in the constant air volume table. Then return to step S64.

[0202] When looking up the current target power value corresponding to the new current target speed in the constant air volume table, if the new current target speed cannot be found in the constant air volume table, then find the speed closest to the new current target speed, and then find the power value corresponding to this speed as the current target power value.

[0203] In some embodiments of the present application, a static pressure identification function start signal is sent to the control module by using a remote controller / line controller, and the identified air conditioner static pressure is displayed after the static pressure identification is completed, so as to facilitate user use.

[0204] The user can select to start the static pressure identification function through the functions of the remote controller / line controller to enter the static pressure automatic identification mode, and the static pressure value is displayed after the static pressure identification is completed. The remote controller / line controller displays the identified air conditioner static pressure value, which can provide convenience for the user.

[0205] For example, the modular air conditioner performs the following steps, as shown in Figure 9 shown.

[0206] Step S71: The user sends a static pressure identification function start signal to the control module through the remote controller / line controller.

[0207] Step S72: After receiving the static pressure identification function start signal, the control module starts the static pressure identification function and begins to perform static pressure identification, that is, executes steps S11 to S19.

[0208] Step S73: After the static pressure identification is completed, the control module sends the identified air conditioner static pressure value to the air conditioner display panel and the remote controller / line controller, and the air conditioner display panel and the remote controller / line controller display the static pressure value for the user to view.

[0209] In some embodiments of the present application, the control module is further configured to: judge whether the inside of the air conditioner or the air supply duct is dirty blocked or damaged according to the identified air conditioner static pressure.

[0210] When there are changes inside the air conditioner or in the air supply duct, the static pressure of the air conditioner will change. Therefore, it is simple and convenient to determine whether there are problems inside the air conditioner or in the air supply duct based on the identified static pressure of the air conditioner.

[0211] In some embodiments of the present application, the control module is further configured to perform the following steps, as shown in Figure 10 shown.

[0212] Step S81: When the air conditioner is installed, start the static pressure identification function, and the identified static pressure of the air conditioner is P1.

[0213] Step S82: After a set time period (such as six months later), start the static pressure identification function, and the identified static pressure of the air conditioner is P2.

[0214] Step S83: According to the magnitude relationship between P1 and P2, determine the specific problems inside the air conditioner or in the air supply duct.

[0215] If P1 is lower than P2, it is determined that there is a blockage due to dirt inside the air conditioner or in the air supply duct;

[0216] If P1 is higher than P2, it is determined that there is damage inside the air conditioner or in the air supply duct;

[0217] If P1 is equal to P2, it is determined that there are no problems inside the air conditioner and in the air supply duct.

[0218] For example, for a newly installed modular air conditioner, the user uses the static pressure self-identification function to identify that the total static pressure of the unit is P1 at this time. Half a year later, the user uses the static pressure self-identification function to identify that the total static pressure of the unit is P2 at this time. If P1 < P2, prompt the user to check whether there is a blockage due to dirt in the air supply duct or inside the unit. If P1 > P2, prompt the user to check whether there is damage to the air supply duct or internal components (such as filters) of the unit.

[0219] By comparing the static pressure of the air conditioner identified at different time periods, it is possible to determine whether there is a blockage due to dirt or damage inside the air conditioner / air supply duct, which is simple and convenient.

[0220] A typical application scenario is that this function can prompt the user of blockage due to dirt in the air duct, blockage due to dirt inside the unit, or damage to components. The user can use the static pressure values identified and displayed by the static pressure self-identification function at different time periods to determine blockage due to dirt or damage to components inside the air duct / unit.

[0221] The present application proposes a modular air conditioner that can achieve a constant air volume through automatic static pressure identification. The modular air conditioner is equipped with a DC variable frequency motor, has a static pressure self-identification function, and can display the identified static pressure on a controller (remote controller or wired controller). The identified static pressure is the total static pressure of the unit.

[0222] For a static pressure system composed of a modular air conditioner and a supply air duct with an unknown static pressure, the static pressure self-identification function can quickly identify the static pressure value of the static pressure system, display the identified static pressure value on the controller (remote controller or wire controller), and make the fan operate at the speed corresponding to the identified static pressure value. That is, in any supply air duct, the modular air conditioner after static pressure self-identification can achieve rated constant air volume operation.

[0223] The modular air conditioner of this embodiment can control the air volume error range within 10% and achieve constant air volume operation.

[0224] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0225] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. Combined air conditioner, characterized in that, Comprising: An air supply section with a fan inside. A control module configured to: Activate the static pressure identification function, obtain the rotational speed and power value corresponding to the first set static pressure value as the current target rotational speed and the current target power value. Control the fan to operate at the current target rotational speed; determine whether the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition. If not, increase / decrease the set rotational speed on the basis of the current target rotational speed as the new current target rotational speed, obtain the current target power value corresponding to the new current target rotational speed; adjust the fan rotational speed, control the fan to operate at the new current target rotational speed, and re-determine whether the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition. If it meets, the static pressure identification is completed, and the static pressure value corresponding to the current target power value is used as the air conditioner static pressure.

2. The combined air conditioner according to claim 1, characterized in that: The control module is further configured to: Before determining whether the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition, it further includes: Determine whether the actual power value exceeds the current target power value. If the actual power value exceeds the current target power value, obtain the rotational speed and power value corresponding to the second set static pressure value as the current target rotational speed and the current target power value; control the fan to operate at the current target rotational speed, and then determine whether the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition. If the actual power value does not exceed the current target power value, directly determine whether the absolute value of the difference between the actual power value of the fan and the current target power value meets the preset condition. Wherein, the second set static pressure value is greater than the first set static pressure value.

3. The combined air conditioner according to claim 1, wherein: The control module is further configured to: Calculate k1×|ΔP|; where k1 is the rotational speed adjustment coefficient; ΔP is the difference between the actual power value and the current target power value. When k1×|ΔP| is within the set range, the set rotational speed = k1×|ΔP|. When k1×|ΔP| exceeds the upper limit value of the set range, the set rotational speed = the upper limit value of the set range; the upper limit value of the set range is determined according to the number of positive and negative switches of ΔP. When k1×|ΔP| is lower than the lower limit value of the set range, the set rotational speed = the lower limit value of the set range.

4. The combined air conditioner according to claim 3, characterized in that: The upper limit value of the set range = k2 / (k3×n + k4); Where n is the number of positive and negative switches of ΔP; k2, k3, and k4 are all constants greater than 0.

5. The combined air conditioner according to claim 1, characterized in that: When any of the following conditions is met, it is determined that the preset condition is met: (1), |(Pz - Ph) / Ph| does not exceed the first set ratio. (2), |(Pz - Ph) / Ph| does not exceed the second set ratio, and the rotational speed adjustment times m are not less than the first set times. (3), |Pz - Ph| does not exceed the set difference. Where Pz is the actual power value of the fan, Ph is the current target power value; the first set ratio is less than the second set ratio.

6. The combined air conditioner according to claim 1, characterized in that: When any of the following conditions is met, it is determined that the preset condition is met: (1) The ratio of |(Pz - Ph) / Ph| does not exceed a first set ratio; (2) The ratio of |(Pz - Ph) / Ph| does not exceed a second set ratio, and the number of times m of speed regulation is not less than a first set number of times; (3) |Pz - Ph| does not exceed a set difference; (4) The number of times m of speed regulation is not less than a second set number of times; Wherein, Pz is the actual power value of the fan, and Ph is the current target power value; the first set ratio is less than the second set ratio; the first set number of times is less than the second set number of times.

7. The combined air conditioner according to claim 1, characterized in that: The control module is further configured to: Preset the corresponding relationship among the static pressure value - fan speed - fan power value under constant air volume; According to the corresponding relationship, obtain the speed and power values corresponding to the first set static pressure value.

8. The combined air conditioner according to claim 1, characterized in that: Send a static pressure identification function start signal to the control module by using a remote controller / line controller, and display the identified air conditioner static pressure after the static pressure identification is completed.

9. The combined air conditioner according to claim 1, wherein: The control module is further configured to: Judge whether the inside of the air conditioner or the air supply duct is dirty blocked or damaged according to the identified air conditioner static pressure.

10. The combined air conditioner according to claim 1, characterized in that: The control module is further configured to: When the air conditioner is installed, start the static pressure identification function, and the identified air conditioner static pressure is P1; After a set time period, start the static pressure identification function, and the identified air conditioner static pressure is P2; If P1 is lower than P2, it is determined that the inside of the air conditioner or the air supply duct is dirty blocked; If P1 is higher than P2, it is determined that the inside of the air conditioner or the air supply duct is damaged.

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