Unit noise centralized adjustment method and system, frequency conversion unit and air conditioner

Abstract

The invention provides a unit noise centralized adjustment method and system, a frequency conversion unit and an air conditioner, and the method comprises the steps that the current area temperature and unit noise data are obtained in real time, and the unit load needed by the current area is calculated according to the current area temperature and the area target temperature; according to the capacity and the accumulated operation time of each unit, under the condition that the unit load is met, the number of the units needing to be started is determined, and then frequency modulation is conducted step by step to avoid the resonant frequency; whether the current unit noise data is larger than a preset environment noise threshold value or not is judged, if yes, frequency modulation is carried out on the basis that the unit load needed by the current area is met, and the current unit noise data is made to be smaller than or equal to the preset environment noise threshold value. The technical problem that modular scheduling cannot be carried out in the prior art is solved, noise and energy efficiency in the whole system are kept balanced and efficient by searching a balance point between noise reduction and unit capacity, and the effects of noise reduction and energy saving are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of centralized noise regulation of a machine set, and in particular to a method and system for centralized noise regulation of a machine set, a variable frequency machine set, and an air conditioner. Background Art

[0002] Hospitals, hotels, convention centers and other large and medium-sized buildings often use a combination of various types of commercial units to meet their specific needs. These specific areas have concentrated crowds and require not only precise temperature and humidity, but also relatively high environmental noise. Due to the vibration of the unit itself and the resonance between units, and the actual installation environment and operating load are different from the single test conditions in the factory, the actual noise is likely to exceed the standard. The same type of units can use modular scheduling to adjust the control capacity and unit switching to reduce noise, while the combination of different types of units cannot eliminate the noise pollution caused by factors such as unit resonance and self-vibration through the unit's own scheduling.

[0003] For variable frequency units that do not have modular functions, the resonance between the units themselves and between units will affect the actual noise. They cannot perform modular scheduling by themselves, nor can they find a dynamic balance point in the contradiction between noise reduction and unit capacity, so as to maintain a balanced and efficient noise and energy efficiency in the entire system and achieve the best effect of noise reduction and energy saving.

[0004] Therefore, the prior art needs to be further developed. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and provide a method and system for centralized regulation of unit noise, a variable frequency unit, and an air conditioner to solve the technical problem in the related art that a variable frequency unit that does not have a modular function cannot be modularly scheduled by itself, nor can it find a dynamic balance point in the contradiction between noise reduction and unit capacity, so as to maintain a balance between noise and energy efficiency in the entire system.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: According to a first aspect of the present invention, the present invention provides a method for centralized noise regulation of a unit, comprising:

[0007] S100, obtaining the current regional temperature and unit noise data in real time, setting the regional target temperature, and calculating the unit load required for the current region based on the current regional temperature and the regional target temperature;

[0008] S200, according to the capacity and cumulative operating time of each unit, while satisfying the load of the unit, determining the number of units that need to be started, and then adjusting the frequency step by step, and avoiding the resonant frequency;

[0009] S300, determining whether the current unit noise data is greater than a preset environmental noise threshold, and if so, performing frequency adjustment on the basis of satisfying the unit load required in the current area, so that the current unit noise data is less than or equal to the preset environmental noise threshold.

[0010] Specifically, the method of determining the number of units to be started based on the capacity and operating time of each unit and under the condition that the load of the units is met includes:

[0011] Sort the units by capacity from large to small, and start the units with large capacity first;

[0012] Sort the units according to their cumulative running time from large to small, and determine in turn whether the difference between the cumulative running time of the unit that is turned on first and the running time of the unit with the shortest cumulative running time is greater than the first preset time. If so, turn off the currently turned on unit and turn on the unit with the shortest cumulative running time;

[0013] If not, the currently turned-on unit will not be shut down, and the operating time difference will continue to be monitored.

[0014] Specifically, if yes, then shut down the currently turned on unit and turn on the unit with the shortest cumulative running time, including:

[0015] Determine whether the current running time difference is less than the second preset time length, if so, shut down the current unit and continue to start the unit with larger capacity;

[0016] If not, continue to monitor the running time difference.

[0017] Specifically, the method of determining the number of units to be turned on, and then adjusting the frequency step by step, and avoiding the resonance frequency, includes:

[0018] After determining the number of units to be turned on, the frequency is gradually increased, and based on the current noise data monitored in real time, it is determined whether the current frequency is the resonant frequency. If so, it is determined whether the resonant frequency is the highest frequency of the unit, and whether to continue to increase the frequency based on the judgment result;

[0019] If not, continue with frequency modulation.

[0020] Specifically, the method for determining whether the current frequency is the resonant frequency based on the current noise data monitored in real time includes:

[0021] Determine whether the change in noise data within a preset frequency band is greater than a first preset value, and if so, the frequency is a resonant frequency;

[0022] If not, then the frequency is not the resonant frequency.

[0023] Specifically, the method of judging whether the resonance frequency is the highest frequency of the unit and judging whether to continue to increase the frequency according to the judgment result includes:

[0024] If the resonant frequency is the highest frequency of the unit, the frequency will not be further increased;

[0025] If the resonant frequency is not the highest frequency of the unit, continue to increase the frequency until it reaches the highest frequency of the unit.

[0026] Specifically, the S300 includes:

[0027] After determining the resonant frequency of the unit at the target temperature of the current area, determine whether the noise data of the current unit is greater than the preset environmental noise threshold. If so, give priority to selecting the unit with the largest capacity and lowering the frequency, while increasing the frequencies of other units that have been turned on, so that the noise data of the current unit is less than or equal to the preset environmental noise threshold;

[0028] If not, continue to monitor the current unit noise.

[0029] Specifically, the method of preferentially selecting the unit with the largest capacity, lowering the frequency, and increasing the frequencies of other units that have been turned on, so that the noise data of the current unit is less than or equal to the preset environmental noise threshold, includes:

[0030] Determine whether the frequency-adjusted unit can meet the unit load required in the current area. If so, operate according to the current frequency;

[0031] If not, add new units.

[0032] Specifically, the method for adding a new unit includes:

[0033] Start the units that are not adjacent to each other and have the shortest cumulative running time, add new units, and judge whether the unit load required by the current area is met and whether the current unit noise data is less than the preset environmental noise threshold. If so, do not continue to add units;

[0034] If not, continue to add units that are not adjacent and have a short operating time until the unit load required for the current area is met and the current unit noise data is less than the preset environmental noise threshold.

[0035] Specifically, the method further includes:

[0036] If the frequency is lowered, the lowest frequency of the frequency reduction is the middle value of the unit's standard frequency;

[0037] If the frequency is increased, the highest frequency of the increase will be the middle value between the standard frequency and the maximum frequency of the unit.

[0038] Specifically, the method further includes:

[0039] The frequency and noise data of each unit are stored in the current regional target temperature to meet the unit load required in the current region and to ensure that the current unit noise data is less than the preset environmental noise threshold. This forms a historical record. When the same or similar regional target temperature is set again, the corresponding frequency is searched as the initial frequency adjustment point.

[0040] According to a second aspect of the present invention, a system for centralized noise regulation of a unit is provided, using the above-mentioned method for centralized noise regulation of a unit, and the system for centralized noise regulation of a unit comprises:

[0041] Acquisition module: used to obtain the current regional temperature and unit noise data in real time;

[0042] Control module: used to set the regional target temperature, calculate the unit load required for the current area according to the current regional temperature and the regional target temperature; determine the number of units to be turned on according to the unit load, and then adjust the frequency step by step to avoid the resonant frequency; determine whether the current unit noise data is greater than the preset environmental noise threshold. If so, adjust the frequency on the basis of meeting the unit load required for the current area, so that the current unit noise data is less than or equal to the preset environmental noise threshold.

[0043] According to a third aspect of the present invention, there is provided a variable frequency unit, comprising:

[0044] The above-mentioned system for centralized noise regulation of the unit.

[0045] Specifically, the frequency conversion unit is provided with an external communication interface, and the frequency conversion unit is connected to the system for centralized noise regulation of the unit through the external communication interface.

[0046] According to a fourth aspect of the present invention, there is provided an air conditioner comprising at least one of the above-mentioned variable frequency units.

[0047] Beneficial effects:

[0048] The present invention obtains the current regional temperature and unit noise data in real time, calculates the unit load required for the current region according to the current regional temperature and the regional target temperature; determines the number of units that need to be turned on according to the capacity and cumulative operating time of each unit while meeting the unit load, and then adjusts the frequency step by step to avoid the resonant frequency; if the current unit noise data is greater than the preset environmental noise threshold, the frequency is adjusted on the basis of meeting the unit load required for the current region, so that the current unit noise data is less than or equal to the preset environmental noise threshold, thereby solving the technical problem that the variable frequency units without modular functions cannot be modularly scheduled by themselves, and cannot find a dynamic balance point in the contradiction between noise reduction and unit capacity, so as to maintain a balance between noise and energy efficiency in the whole system. The present invention can maintain a balance and high efficiency between noise and energy efficiency in the whole system by finding a dynamic balance point between noise reduction and unit capacity, thereby achieving the effect of noise reduction and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a flow chart of a method for centralized noise regulation of a unit provided in a specific embodiment of the present invention;

[0050] Figure 2 is a flow chart of a noise centralized regulation process provided in a specific embodiment of the present invention;

[0051] Figure 3 is a schematic diagram of unit distribution provided in a specific embodiment of the present invention;

[0052] Figure 4 It is a schematic diagram of the composition of a system for centralized noise regulation of a unit provided in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0054] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments.

[0055] Embodiment 1

[0056] According to an embodiment of the present invention, a method for centralized unit noise regulation is provided, comprising: obtaining the current regional temperature and unit noise data in real time, setting the regional target temperature, and calculating the unit load required for the current region according to the current regional temperature and the regional target temperature; determining the number of units that need to be turned on while satisfying the unit load according to the capacity and cumulative operating time of each unit, and then adjusting the frequency step by step while avoiding the resonant frequency; judging whether the current unit noise data is greater than a preset environmental noise threshold, and if so, adjusting the frequency on the basis of satisfying the unit load required for the current region so that the current unit noise data is less than or equal to the preset environmental noise threshold.

[0057] Specifically, the method for centralized regulation of unit noise in this embodiment solves the technical problem that the variable frequency units that do not have modular functions are currently unable to perform modular scheduling by themselves, and are unable to find a dynamic balance point in the contradiction between noise reduction and unit capacity, so as to maintain a balance between noise and energy efficiency in the entire system. The present invention can maintain a balance and high efficiency between noise and energy efficiency in the entire system by finding a dynamic balance point between noise reduction and unit capacity, thereby achieving the effect of noise reduction and energy saving.

[0058] See also Figures 1 to 3 In the method for centralized noise regulation of the unit in this embodiment, the method specifically includes:

[0059] S100, obtaining the current regional temperature and unit noise data in real time, setting the regional target temperature, and calculating the unit load required for the current region based on the current regional temperature and the regional target temperature;

[0060] It is understandable that the unit is first equipped with a sound collector or decibel meter or other related instruments to collect the unit noise data, and the real-time noise data of each unit is fed back to the control module for adjustment. The sound collector can be installed on each unit, or between each unit, for example, one is installed between two or four adjacent units, and the two or four units are treated as a noise source as a whole, which can save costs.

[0061] Furthermore, the regional target temperature can be pre-set by the user according to actual needs, or the regional standard value can be automatically obtained from the server. When setting, the user can set it independently according to his or her own body temperature perception. The air-conditioning unit calculates the conduction heat transfer, convection heat transfer, radiation heat transfer, and ventilation load according to the formula based on the set regional target temperature, the current actual ambient temperature, outdoor temperature, air density, specific heat capacity, indoor heat source, ventilation volume and other parameter values. These are added together to calculate the total load, that is, the unit load required for the current area. If the total load is negative, it means that the current ambient temperature is higher than the regional target temperature, and the air conditioner needs to be cooled. The cooling capacity of the air-conditioning unit is adjusted according to the total load to achieve the target temperature. The specific calculation process is as follows:

[0062] To calculate the total load of the air conditioning unit, multiple factors need to be considered, including conduction heat transfer, convection heat transfer, radiation heat transfer and ventilation load. These loads can be calculated using the corresponding physical formulas. The following are the detailed calculation steps and formulas:

[0063] (1) Conduction heat transfer

[0064] Conduction heat transfer usually transfers heat through solid materials such as walls and windows. The specific formula is as follows:

[0065] Qconduction=U*A*(Tout-Tin);

[0066] Where Qconduction is the conduction heat transfer load, in W; U is the heat transfer coefficient, in W / m 2 K; A is the heat transfer area, unit: m 2 ; Tout is the outdoor temperature, unit is ℃; Tin is the indoor temperature, unit is ℃.

[0067] (2) Convective heat transfer

[0068] Convective heat transfer usually transfers heat through air flow, and the specific formula is as follows:

[0069] Qconvection=h*A*(Tout-Tin);

[0070] Where Qconvection is the convective heat transfer load, in W; h is the convective heat transfer coefficient, in W / m 2 K; A is the heat transfer area, unit: m 2 ; Tout is the outdoor temperature, unit is ℃; Tin is the indoor temperature, unit is ℃.

[0071] (3) Radiative heat transfer

[0072] Radiative heat transfer usually transfers heat through electromagnetic waves. The specific formula is as follows:

[0073] Qradiation=ε*σ*A*(Tout−Tin);

[0074] Where Qradiation is the radiation heat transfer load, in W; ε is the emissivity, dimensionless, ranging from 0 to 1; σ is the Stefan-Boltzmann constant (5.67×10 -8 W / m 2 ·K 4 ); A is the heat transfer area, unit: m 2 ; Tout is the outdoor temperature, unit K; Tin is the indoor temperature, unit K;

[0075] (4) Ventilation load

[0076] The ventilation load is the heat change caused by the fresh air entering the room. The specific formula is as follows:

[0077] Qventilation=V*ρ*cp*(Tout-Tin);

[0078] Where Qventilation is the ventilation load, in W; V is the ventilation volume (m 3 / s; ρ is air density (kg / m 3 );cp is the specific heat capacity of air (J / kg·K);Tout is the outdoor temperature (℃);

[0079] Tin is the indoor temperature (℃)

[0080] (5) Indoor heat source

[0081] Indoor heat sources include heat generated by human body, electrical equipment, etc. It is assumed that the total heat source is Qinternal.

[0082] (6) Total Load

[0083] Add the above loads together to get the total load Qtotal:

[0084] Qtotal=Qconduction+Qconvection+Qradiation+Qventilation+Qinternal;

[0085] If the total load Qtotal is a negative value, it means that the current ambient temperature is higher than the target temperature and the air conditioner needs to cool.

[0086] S200, according to the capacity and cumulative operating time of each unit, while satisfying the load of the unit, determining the number of units that need to be started, and then adjusting the frequency step by step, and avoiding the resonant frequency;

[0087] In the method of this embodiment, the number of units to be turned on is determined based on the capacity and cumulative operating time of each unit, which can achieve efficient use of energy, ensure that energy supply is accurately matched to actual demand, and further improve the reliability of the present invention.

[0088] Specifically, the method of determining the number of units to be started based on the capacity and operating time of each unit and under the condition that the load of the units is met includes:

[0089] Sort the units by capacity from large to small, and start the units with large capacity first;

[0090] Sort the units according to their cumulative running time from large to small, and determine in turn whether the difference between the cumulative running time of the unit that is turned on first and the running time of the unit with the shortest cumulative running time is greater than the first preset time. If so, turn off the currently turned on unit and turn on the unit with the shortest cumulative running time;

[0091] If not, the currently turned-on unit will not be shut down, and the operating time difference will continue to be monitored.

[0092] In the method of this embodiment, the capacity of the unit refers to the cooling or heating capacity of the unit, that is, the amount of heat that the unit can remove or add from a space per unit time, and this capacity is usually measured in kilowatts (kW) or British thermal units (BTU) per hour. The capacity of the variable frequency unit can be adjusted by changing the speed of the compressor. When more cooling or heating is required, the compressor can run at a higher speed to increase the capacity of the unit. When the demand decreases, the compressor can reduce the speed to reduce the capacity of the unit. When the variable frequency unit is running at partial load, the speed of the compressor can be adjusted to match the actual demand, thereby improving energy efficiency.

[0093] Preferably, the specific value of the first preset time may vary depending on different system settings, but in general, it will be set between a few hours and a day, such as 8 hours, 12 hours, 24 hours, etc. In this embodiment, the first preset time is set to 24 hours, that is, when the difference between the cumulative running time of the unit that is turned on first and the running time of the unit with the shortest cumulative running time is greater than 24 hours, the currently turned on unit is turned off and the unit with the shortest cumulative running time is turned on.

[0094] Furthermore, sorting the units in descending order of capacity and giving priority to starting the units with large capacities can make full use of the capacity resources of the units. Units with large capacities are often more efficient in meeting load demands and can bear larger loads with fewer units, thereby improving the resource utilization efficiency of the entire system. Sorting by cumulative operating time and deciding on the opening and closing of units based on the difference with the unit with the shortest operating time can help achieve balanced wear of each unit, avoid long-term continuous operation of some units, extend the overall service life of the entire unit group, and effectively ensure the stable operation of the system.

[0095] Specifically, if yes, then shut down the currently turned on unit and turn on the unit with the shortest cumulative running time, including:

[0096] Determine whether the current running time difference is less than the second preset time length, if so, shut down the current unit and continue to start the unit with larger capacity;

[0097] If not, continue to monitor the running time difference.

[0098] Furthermore, when the operating time difference is less than the second preset time, the current unit is shut down and the unit with larger capacity is continuously turned on, which can reduce unnecessary frequent switching, thereby extending the service life of the unit and more reasonably allocating the operating time of each unit. While ensuring that the unit with larger capacity operates first, the balance of the operating time of each unit is also taken into account, which is beneficial to the stable operation and long-term use of the entire unit group.

[0099] Preferably, in this embodiment, the second preset time is set to 12 hours, that is, when the current operating time difference is reduced to 12 hours, the current unit is turned off and the unit with large capacity continues to be turned on to ensure the heating or cooling efficiency of the air-conditioning unit.

[0100] Specifically, the method of determining the number of units to be turned on, and then adjusting the frequency step by step, and avoiding the resonance frequency, includes:

[0101] After determining the number of units to be turned on, the frequency is gradually increased, and based on the current noise data monitored in real time, it is determined whether the current frequency is the resonant frequency. If so, it is determined whether the resonant frequency is the highest frequency of the unit, and whether to continue to increase the frequency based on the judgment result;

[0102] If not, continue with frequency modulation.

[0103] In the method of this embodiment, certain components of the unit will resonate at specific frequencies. The resonance will significantly increase the vibration amplitude of the components. This violent vibration will be converted into sharply increased noise. The resonance will significantly increase the noise level. If the frequency approaches or exceeds these resonant frequencies, the noise may increase sharply. By adjusting the operating frequency to avoid the resonant frequency and thus reduce the noise, the noise level of the air-conditioning unit can be significantly reduced.

[0104] Furthermore, the unit load requirements must be met while avoiding the resonant frequency. Therefore, when adjusting the frequency, the unit load required in the current area must be guaranteed.

[0105] Specifically, the method for determining whether the current frequency is the resonant frequency based on the current noise data monitored in real time includes:

[0106] Determine whether the change in noise data within a preset frequency band is greater than a first preset value, and if so, the frequency is a resonant frequency;

[0107] If not, then the frequency is not the resonant frequency.

[0108] It should be further explained that the resonant frequency of the unit has multiple sections and is not constant. The resonant frequency can be avoided by frequency modulation, but the capacity of the unit will also be affected, generally decreasing. At this time, more units need to be turned on to meet the unit load in the current area. According to the required load, the unit capacity is taken as the first priority to adjust the number of units turned on.

[0109] Furthermore, in this embodiment, the preset frequency band is preferably 5 Hz, and the first preset value is preferably 10 dB. The resonant frequency is determined by judging whether the change in noise data within 5 Hz is greater than 10 dB, which can effectively prevent the unit from being damaged due to resonance. When the unit operates at the resonant frequency, the vibration amplitude will increase sharply, which may cause the various components of the unit to be subjected to excessive stress, greatly extending the service life of the equipment and reducing the cost of equipment maintenance and replacement. Accurately determining the resonant frequency helps to ensure the stable operation of the equipment and effectively reduce the noise level.

[0110] Specifically, the method of judging whether the resonance frequency is the highest frequency of the unit and judging whether to continue to increase the frequency according to the judgment result includes:

[0111] If the resonant frequency is the highest frequency of the unit, the frequency will not be further increased;

[0112] If the resonant frequency is not the highest frequency of the unit, continue to increase the frequency until it reaches the highest frequency of the unit.

[0113] It should be noted here that the maximum frequency of the unit refers to the maximum frequency at which the unit can operate safely. The frequency of the current resonance point is lower than the maximum frequency of the compressor. In order to avoid the resonance point, the compressor frequency can be adjusted upward to 1.5 times the frequency of the current resonance point. If the 1.5 times frequency exceeds the maximum frequency of the compressor, the frequency is reduced by 0.7 times. When the resonance frequency is the maximum frequency of the unit, the frequency is not increased further, which effectively avoids the unit from operating in an abnormal state. Because at the resonance frequency, the vibration amplitude of the unit is already large. If the frequency is increased further, the vibration of the unit may become more severe. It avoids working at a resonance frequency that may cause greater vibration, thereby maintaining the stability of the unit equipment operation.

[0114] S300, determining whether the current unit noise data is greater than a preset environmental noise threshold, and if so, performing frequency adjustment on the basis of satisfying the unit load required in the current area, so that the current unit noise data is less than or equal to the preset environmental noise threshold.

[0115] Specifically, the S300 includes:

[0116] After determining the resonant frequency of the unit at the target temperature of the current area, determine whether the noise data of the current unit is greater than the preset environmental noise threshold. If so, give priority to selecting the unit with the largest capacity and lowering the frequency, while increasing the frequencies of other units that have been turned on, so that the noise data of the current unit is less than or equal to the preset environmental noise threshold;

[0117] If not, continue to monitor the current unit noise.

[0118] It is understandable that the noise standard range of the unit is generally between 65dBA and 75dBA, and the actual use may exceed the standard. The noise of the unit should be limited to the required noise limit of the actual indoor or use area. The user can set or select the appropriate noise threshold according to the use area, which is used as the standard basis for adjusting the unit noise. For example, in the convention and exhibition center, the noise requirements in different areas are different. The background noise should not exceed 45dBA to 50dBA to ensure the comfort of the environment. The noise level in the exhibition, conference and communication area should be controlled between 55dBA and 65dBA, and the rest and office area usually does not exceed 45dBA to 50dBA.

[0119] Furthermore, when the unit noise data is greater than the preset environmental noise threshold, the unit with the largest capacity is preferentially selected to lower the frequency, and the frequencies of other turned-on units are increased at the same time, so that the current unit noise data is less than or equal to the preset environmental noise threshold, thereby reducing noise pollution in the environment. In the process of adjusting the unit frequency, it is also necessary to avoid the resonant frequency. After determining the resonant frequency, frequency adjustment is performed to help maintain the stable operation of the unit. At the same time, by reasonably adjusting the frequencies of different units, it is ensured that the units can continue to work stably while reducing noise, and there will be no problems such as insufficient cooling or heating capacity due to frequency adjustment. The unit with the largest capacity is preferentially selected to lower the frequency. This targeted operation helps to optimize energy consumption and improve overall energy efficiency.

[0120] Specifically, the method of preferentially selecting the unit with the largest capacity, lowering the frequency, and increasing the frequencies of other units that have been turned on, so that the noise data of the current unit is less than or equal to the preset environmental noise threshold, includes:

[0121] Determine whether the frequency-adjusted unit can meet the unit load required in the current area. If so, operate according to the current frequency;

[0122] If not, add new units.

[0123] Furthermore, after frequency modulation, it is determined again whether the unit load required in the current area is met, thereby ensuring the load demand in the current area, thereby maintaining a comfortable temperature environment in the area and meeting the needs of users.

[0124] Specifically, the method for adding a new unit includes:

[0125] Select units that are not adjacent to each other and have a short cumulative running time to start, add new units, and determine whether the unit load required by the current area is met and whether the current unit noise data is less than the preset environmental noise threshold. If so, do not continue to add units;

[0126] If not, continue to add units that are not adjacent and have a short operating time until the unit load required for the current area is met and the current unit noise data is less than the preset environmental noise threshold.

[0127] In the method of this embodiment, the load status of the unit will be fed back to the control module, and the control module will record the operating time of each unit. Each unit is provided with an external communication interface, and the location distribution of the unit is consistent with the address code of the external communication interface. From the numbering, it can be known whether the unit locations are adjacent, which helps to balance the usage time of each unit and meet the load requirements for the units in the area, thereby ensuring the stable operation of the system.

[0128] Specifically, the method further includes:

[0129] If the frequency is lowered, the lowest frequency of the frequency reduction is the middle value of the unit's standard frequency;

[0130] If the frequency is increased, the highest frequency of the increase will be the middle value between the standard frequency and the maximum frequency of the unit.

[0131] It should be noted here that the standard frequency is the factory default load (compressor, fan) frequency of the unit, and the maximum frequency is the maximum frequency at which the unit can operate safely. Generally, the frequency increase is based on the standard frequency of the unit and increases upward, but the unit is generally not allowed to run at full load for a long time. Therefore, the standard frequency of the unit is used as the benchmark to half of the maximum frequency to avoid the unit running at full load for a long time. The frequency reduction is also based on half of the standard frequency of the unit. The lowest can be reduced to half of the standard frequency, which helps to maintain the basic operating state of the unit and greatly improves the safety and reliability of the unit.

[0132] Specifically, the method further includes:

[0133] The frequency and noise data of each unit are stored in the current regional target temperature to meet the unit load required in the current region and to ensure that the current unit noise data is less than the preset environmental noise threshold. This forms a historical record. When the same or similar regional target temperature is set again, the corresponding frequency is searched as the initial frequency adjustment point.

[0134] Furthermore, due to the large number of priority factors, in order to facilitate rapid scheduling, the control module records the compressor fan operating frequency and noise value of each unit corresponding to the actual set target temperature. When the user's target temperature setting is the same, these data are used as the target temperature of each unit first, and then adjusted and approximated one by one to make the system enter stability as quickly as possible, which saves time to a great extent and improves the unit's operating efficiency.

[0135] See also Figure 2 , the working process of the present invention is described below by means of specific examples:

[0136] Step 1: First, configure the unit with a sound collector or decibel meter and other related instruments to collect the noise value of the unit, and feed back the real-time noise value of each unit to the control module. This sound collector can be installed on each unit or between units to save costs;

[0137] Step 2: Preset the environmental noise threshold. This preset value can be modified manually, and the system can also obtain the regional standard value from the server;

[0138] Step 3: The user sets the target temperature for the area and calculates the unit load required for the area;

[0139] Because some parts of the unit may resonate at certain frequencies, this resonance will significantly increase the noise level. If the frequency approaches or exceeds these resonant frequencies, the noise may increase sharply. While avoiding the resonant frequencies, the unit load requirements must also be met.

[0140] Step 4: The resonant frequency of the unit has multiple sections and is not constant. By adjusting the frequency to avoid the resonant frequency, the capacity of the unit will also be affected, generally decreasing. At this time, more units need to be turned on to meet the load. According to the required load, the unit performance is the first priority to determine the number of units to be turned on;

[0141] Regarding determining the number of units to be turned on, for example:

[0142] Choose an operating frequency far away from the resonant frequency. It is usually recommended to adjust the operating frequency to more than 1.4 times or less than 0.7 times the resonant frequency to avoid resonance. After adjustment, re-measure the vibration of the unit to confirm whether the resonant frequency band is effectively avoided. Observe the operating status of the unit to ensure that no other abnormal conditions occur. If the initial adjustment fails to completely solve the problem, the operating frequency can be gradually fine-tuned until the optimal operating frequency point is found. Record the results of each adjustment for subsequent reference and optimization. If the operating frequency cannot be adjusted to more than 1.4 times (may involve the upper limit of frequency modulation), it needs to be adjusted to less than 0.7 times. At this time, the cooling capacity is generally insufficient. To compensate for the cooling capacity, additional units need to be opened:

[0143] (1) Calculate the total cooling demand: Calculate the total cooling capacity required based on the actual application;

[0144] (2) Consider peak demand: Take into account load fluctuations to ensure that cooling demand can be met during peak hours;

[0145] (3) Check the technical specifications of each unit to understand its cooling capacity at different operating frequencies;

[0146] (4) Calculate the number of units required:

[0147] Determine the cooling capacity of a single unit at 0.7 times the frequency: Assuming that the cooling capacity of a single unit at 100% frequency is Q, then the cooling capacity at 0.7 times the frequency is approximately 0.7Q.

[0148] Calculate the ratio of total cooling demand to the cooling capacity of a single unit: divide the total cooling demand by the cooling capacity of a single unit at 0.7 times the frequency to get the number of units required.

[0149] The number of units required = total cooling demand / cooling capacity of a single unit at 0.7 times the frequency;

[0150] Since some units cannot be turned on, the calculation results need to be rounded up to ensure sufficient total cooling capacity in consideration of redundancy and flexibility.

[0151] Step 5: After selecting the unit that meets the required load, start step-by-step frequency adjustment and monitor the unit noise in real time. If the noise suddenly increases, mark this frequency band as the resonant frequency band:

[0152] (1) Use a noise meter or sound collector to measure the noise level of the unit at different operating frequencies and record the noise value at each frequency point.

[0153] (2) Create a data table: Record the noise level at each operating frequency to form a data table, as shown in Table 1:

[0154] Table 1 Noise level records at different operating frequencies

[0155]

[0156]

[0157] Observe the noise level in the data table and look for the frequency point where the noise suddenly increases. For example, in the table above, the noise level increases significantly from 50Hz to a maximum of 95dB. Therefore, it can be preliminarily determined that 50Hz is the resonant frequency. To avoid this frequency, the operating frequency can be adjusted to more than 1.4 times (about 70Hz) or less than 0.7 times (about 35Hz) of 50Hz.

[0158] If this frequency band is not the highest frequency, continue to adjust the frequency upwards, otherwise, no further frequency up-conversion will be performed.

[0159] After the operation is stable, if the capacity is insufficient due to avoiding the resonance frequency, continue to add unselected units to meet the capacity;

[0160] Step 6: Compare the real-time noise value and the regional noise threshold after stable operation. If the real-time noise value is detected to exceed the preset noise threshold, the frequency of the unit with larger capacity will be limited first, the frequency will be reduced, the noise will be reduced, and the frequency of the small units added in the system will be increased or other units will be added. The specific method is as follows:

[0161] In order to ensure that the noise level is still greater than the current environmental noise threshold after avoiding the resonance frequency, adjusting the frequency and adding units, the operating frequency and load of the unit can be automatically adjusted according to the actual load demand. The PID control algorithm is used to automatically adjust the operating frequency and load of the unit according to the load demand. The specific control logic is as follows:

[0162] Data collection: collect data such as ambient temperature, system load, unit operating frequency, etc.

[0163] Set threshold: Set the ambient noise threshold to 60dB;

[0164] Set the target load to Ltarget;

[0165] Calculate the error: Calculate the error E between the current load Lcurrent and the target load Ltarget = Ltarget - Lcurrent.

[0166] PID control: proportional term: P = Kp*E;

[0167] Integral term: I = Ki*∫E dt;

[0168] Differential term: D = Kd*dE / dt;

[0169] Control output: U=P+I+D;

[0170] Adjust frequency: adjust the operating frequency of the unit according to the control output U;

[0171] If the noise level is still above 60dB, continue to adjust until it meets the requirements.

[0172] Step 7: Through the unit's external communication interface, send the unit an instruction to adjust the target temperature and limit the operating frequency in order to reduce the compressor and fan frequency of the unit to achieve the purpose of noise reduction;

[0173] Because lowering the unit target temperature and frequency will reduce the unit capacity and fail to reach the target temperature expected by the user, in order to meet the demand, it is necessary to increase the target temperature and frequency of other units or add other units to be turned on. At this time, the set target temperature and frequency of the units in the system are adjusted according to the ambient temperature and the actual target temperature set by the user and the actual noise;

[0174] The unit frequency cannot be reduced continuously, and must be at least the middle value of the standard frequency;

[0175] The highest frequency of the unit frequency increase is the middle value between the standard frequency and the maximum frequency;

[0176] If it still cannot be met, then add other units to meet the load demand;

[0177] Step 8: The selection of target units to be added should follow the principle of opening first those that are not adjacent and have the shortest cumulative running time of loads (compressors). If the user adjusts the target temperature and two units cannot meet the requirement, then a third unit will be added and dynamically adjusted until both the noise threshold and the capacity are met.

[0178] Step 9: The cumulative running time of the unit is taken as the second priority, and the unit with the shortest cumulative running time is started first;

[0179] Because capacity is the first priority, the cumulative running time of units with large capacity is always greater than that of units with small capacity. Over a long period of time, the time gap becomes larger and larger. When the running time difference is greater than the first preset time, a priority reversal will occur. The cumulative running time is the first priority, and the capacity is the second priority. The unit with the shorter cumulative running time will be started first to shorten the gap between the two. When the gap is reduced to the second preset time, the normal priority will be restored.

[0180] Step 10: Due to the large number of priority factors, in order to facilitate rapid scheduling, the compressor fan operating frequency and noise value corresponding to the actual set target temperature of each unit are stored, generally with each degree Celsius as a record. After the operation of each unit is stable, the noise values ​​of different unit combinations are recorded to form a historical record. When the user's target temperature setting is the same, these data are used as the target temperature of each unit first, and then adjusted and approximated one by one to make the system enter stability as quickly as possible. The corresponding relationship between load target and noise is recorded, and the balance point is found quickly, and adjusted from the close balance point up or down. For example, as shown in Table 2, the noise of the three units at different loads and different operating frequencies is different:

[0181] If the A1 load is 12KW, the operating frequency is 55Hz, and the noise is 62dB, and the noise level needs to be maintained below 60, the operating frequency can be reduced to 45, and an additional A3 unit can be added to meet the load. The operating frequency is adjusted to 45, which means that there is no need to make any further adjustments. The stored records can be used as a basis for adjustment.

[0182] Table 2 Noise data of the three units at different loads and operating frequencies

[0183] Unit No. Current load (kW) Operating frequency (Hz) Noise level (dB) Ambient temperature (℃) A1 10 50 60 22 A1 12 55 62 22 A1 8 45 58 22 A2 15 60 65 22 A2 10 50 60 22 A2 18 65 68 22 A3 12 55 62 22 A3 10 50 60 22 A3 8 45 58 22

[0184] It should be noted here that the present embodiment provides a method for centralized regulation of unit noise, by obtaining the current area temperature and unit noise data in real time, and calculating the unit load required for the current area according to the current area temperature and the area target temperature; according to the unit load, determining the number of units to be turned on, and then adjusting the frequency step by step, and avoiding the resonant frequency; if the current unit noise data is greater than the preset environmental noise threshold, then on the basis of meeting the unit load required for the current area, frequency adjustment is performed so that the current unit noise data is less than or equal to the preset environmental noise threshold, which solves the current technical problem that the variable frequency units that do not have modular functions cannot be modularly scheduled by themselves, and cannot find a dynamic balance point in the contradiction between noise reduction and unit capacity, so that the noise and energy efficiency in the whole system are balanced. The present invention can maintain a balance and high efficiency between noise and energy efficiency in the whole system by finding a dynamic balance point between noise reduction and unit capacity, thereby achieving the effect of noise reduction and energy saving.

[0185] Embodiment 2

[0186] See also Figure 4 This embodiment provides a system for centralized noise regulation of a unit, the system comprising:

[0187] Acquisition module 100: used to obtain the current regional temperature and unit noise data in real time;

[0188] Control module 200: used to set the regional target temperature, calculate the unit load required for the current region according to the current regional temperature and the regional target temperature; determine the number of units that need to be turned on based on the capacity and cumulative operating time of each unit while meeting the unit load, and then adjust the frequency step by step to avoid the resonant frequency; determine whether the current unit noise data is greater than the preset environmental noise threshold, and if so, adjust the frequency on the basis of meeting the unit load required for the current region so that the current unit noise data is less than or equal to the preset environmental noise threshold.

[0189] It should be noted that this embodiment provides a system for centralized noise regulation of the unit, and this embodiment realizes the search for a dynamic balance point between noise reduction and unit capacity, so that the noise and energy efficiency in the entire system can be balanced and efficient, which helps to reasonably arrange the operation of the unit. At the same time, through real-time monitoring and control of unit noise data, it is ensured that the noise is controlled within a reasonable range on the basis of meeting the load demand.

[0190] Embodiment 3

[0191] See also Figure 3 This embodiment provides a variable frequency unit. The variable frequency unit of this embodiment is suitable for the system for centralized noise regulation of the unit in the above-mentioned embodiment 2.

[0192] Specifically, the frequency conversion unit is provided with an external communication interface, and the frequency conversion unit is connected to the system for centralized noise regulation of the unit through the external communication interface.

[0193] See also Figure 3 Commercial variable frequency units are basically equipped with an external communication interface for remote monitoring. Each unit is connected to the system for centralized noise regulation of the unit through the external communication interface. Through this interface, users can easily read the load operation status of the unit, set the function mode, the maximum frequency and the target temperature and humidity, etc. on the computer or mobile terminal, without having to specially set up the controllers of the units scattered in various places. It is flexible and convenient, and can also be centrally managed. This embodiment utilizes the external communication interface to communicate with the system for centralized noise regulation of the unit, and connects the variable frequency units that do not have modularity to the system for centralized noise regulation of the unit through their respective interfaces for centralized processing and scheduling, which further balances the unit capacity and noise.

[0194] It should be noted here that the present embodiment provides a variable frequency unit. Under the framework of the centralized noise regulation system of the unit, the performance of the variable frequency unit is optimized. It can better follow the frequency regulation strategy of the system, and effectively control its own noise level while meeting the regional target temperature requirements. The number of start-ups and the frequency regulation method are determined according to the load requirements of the variable frequency unit. The variable frequency unit can perform reasonable frequency adjustments according to the corresponding instructions, which greatly reduces energy waste, improves the energy utilization efficiency of the variable frequency unit, enhances operating stability, and greatly improves the operating reliability of the variable frequency unit and extends its service life.

[0195] Embodiment 4

[0196] See also Figure 3 This embodiment provides an air conditioner, comprising at least one variable frequency unit in the third embodiment.

[0197] It should be noted here that the present embodiment provides an air conditioner, which includes the above-mentioned variable frequency unit, and can perform variable frequency adjustment according to actual needs, so that the air conditioner can achieve more precise temperature control. At the same time, it can perform comprehensive processing according to the target temperature and humidity, the preset noise value of the environment and the characteristics of the unit itself, and dynamically balance the mutual influence between the units to find the optimal state of noise and energy efficiency, thereby achieving the effect of noise reduction and energy saving, and providing a more stable indoor temperature environment. The smooth operation of the variable frequency unit helps to reduce the wear of the air-conditioning equipment. The variable frequency unit can reduce noise by adjusting the frequency during operation, thereby improving the comfort of the indoor environment.

[0198] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0199] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0200] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0201] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0202] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for centralized noise regulation of a unit, characterized in that: include: S100, obtaining the current regional temperature and unit noise data in real time, setting the regional target temperature, and calculating the unit load required for the current region based on the current regional temperature and the regional target temperature; S200, according to the capacity and cumulative operating time of each unit, while satisfying the load of the unit, determining the number of units that need to be started, and then adjusting the frequency step by step, and avoiding the resonant frequency; S300, determining whether the current unit noise data is greater than a preset environmental noise threshold, and if so, performing frequency adjustment on the basis of satisfying the unit load required in the current area, so that the current unit noise data is less than or equal to the preset environmental noise threshold.

2. The method for centralized noise regulation of a unit according to claim 1, characterized in that: The method of determining the number of units to be started based on the capacity and operating time of each unit and under the condition that the load of the units is met includes: Sort the units by capacity from large to small, and start the units with large capacity first; Sort the units according to their cumulative running time from large to small, and determine in turn whether the difference between the cumulative running time of the unit that is turned on first and the running time of the unit with the shortest cumulative running time is greater than the first preset time. If so, turn off the currently turned on unit and turn on the unit with the shortest cumulative running time; If not, the currently turned-on unit will not be shut down, and the operating time difference will continue to be monitored.

3. The method for centralized noise regulation of a unit according to claim 2, characterized in that: If so, the currently turned on unit is turned off, and the unit with the shortest cumulative running time is turned on, including: Determine whether the current running time difference is less than the second preset time length, if so, shut down the current unit and continue to start the unit with larger capacity; If not, continue to monitor the running time difference.

4. The method for centralized noise regulation of a unit according to claim 1, characterized in that: The method of determining the number of units to be turned on, then adjusting the frequency step by step, and avoiding the resonance frequency includes: After determining the number of units to be turned on, the frequency is gradually increased, and based on the current noise data monitored in real time, it is determined whether the current frequency is the resonant frequency. If so, it is determined whether the resonant frequency is the highest frequency of the unit, and whether to continue to increase the frequency based on the judgment result; If not, continue with frequency modulation.

5. The method for centralized noise regulation of a unit according to claim 4, characterized in that: The method for determining whether the current frequency is a resonant frequency based on the current noise data monitored in real time includes: Determine whether the change in noise data within a preset frequency band is greater than a first preset value, and if so, the frequency is a resonant frequency; If not, then the frequency is not the resonant frequency.

6. The method for centralized noise regulation of a unit according to claim 5, characterized in that: The method of judging whether the resonance frequency is the highest frequency of the unit and judging whether to continue to increase the frequency according to the judgment result includes: If the resonant frequency is the highest frequency of the unit, the frequency will not be further increased; If the resonant frequency is not the highest frequency of the unit, continue to increase the frequency until it reaches the highest frequency of the unit.

7. The method for centralized noise regulation of a unit according to claim 6, characterized in that: The S300 includes: After determining the resonant frequency of the unit at the target temperature of the current area, determine whether the noise data of the current unit is greater than the preset environmental noise threshold. If so, give priority to selecting the unit with the largest capacity and lowering the frequency, while increasing the frequencies of other units that have been turned on, so that the noise data of the current unit is less than or equal to the preset environmental noise threshold; If not, continue to monitor the current unit noise.

8. The method for centralized noise regulation of a unit according to claim 7, characterized in that: The method of preferentially selecting the unit with the largest capacity, lowering the frequency, and raising the frequencies of other units that have been turned on, so that the noise data of the current unit is less than or equal to the preset environmental noise threshold, includes: Determine whether the frequency-adjusted unit can meet the unit load required in the current area. If so, operate according to the current frequency; If not, add new units.

9. The method for centralized noise regulation of a unit according to claim 8, characterized in that: The method for adding a new unit comprises: Select units that are not adjacent to each other and have a short cumulative running time to start, and determine whether the currently turned-on units meet the unit load required in the current area and whether the current unit noise data is less than the preset environmental noise threshold. If so, do not continue to add units; If not, continue to add units that are not adjacent and have short operating times until the unit load required for the current area is met and the current unit noise data is less than the preset environmental noise threshold.

10. The method for centralized noise regulation of a unit according to claim 8, characterized in that: The method further comprises: If the frequency is lowered, the lowest frequency of the frequency reduction is the middle value of the unit's standard frequency; If the frequency is increased, the highest frequency of the increase will be the middle value between the standard frequency and the maximum frequency of the unit.

11. The method for centralized noise regulation of a unit according to claim 8, characterized in that: The method further comprises: The frequency and noise data of each unit are stored under the current regional target temperature to meet the unit load required for the current area and to meet the current unit noise data less than the preset environmental noise threshold. This forms a historical record. When the same or similar regional target temperature is set again, the corresponding frequency is searched as the initial frequency adjustment point.

12. A system for centralized noise regulation of a unit, characterized in that: The method for centralized noise regulation of a unit according to any one of claims 1 to 11 is adopted, wherein the system for centralized noise regulation of a unit comprises: Acquisition module: used to obtain the current regional temperature and unit noise data in real time; Control module: used to set the regional target temperature, calculate the unit load required for the current area based on the current regional temperature and the regional target temperature; determine the number of units that need to be turned on based on the capacity and cumulative operating time of each unit while meeting the unit load, and then adjust the frequency step by step to avoid the resonant frequency; determine whether the current unit noise data is greater than the preset environmental noise threshold. If so, adjust the frequency on the basis of meeting the unit load required for the current area so that the current unit noise data is less than or equal to the preset environmental noise threshold.

13. A frequency conversion unit, characterized in that: include: The system for centralized noise regulation of a machine unit as claimed in claim 12.

14. The frequency conversion unit according to claim 13, characterized in that: The frequency conversion unit is provided with an external communication interface, and the frequency conversion unit is connected to the system for centralized noise regulation of the unit through the external communication interface.

15. An air conditioner, characterized in that: At least one frequency conversion unit as claimed in claim 13 or 14 is included.

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