A domestic two-coupling frequency vibration reduction control method, controller and system

Abstract

This invention relates to a frequency-shifting and vibration-damping control method, controller, and system for a household dual-supply system. The method includes: acquiring the current operating frequency of the compressor; acquiring the current rotational speed and number of blades of the axial fan, and calculating its fundamental frequency and harmonics; comparing the compressor's operating frequency with the fan's harmonics to determine if there is a frequency difference less than a preset threshold; if so, adjusting the fan speed and recalculating and comparing until the frequency shift condition is met; and finally controlling the fan to operate at the target speed. This solution can actively shift the vibration frequencies and harmonics of the compressor and axial fan, effectively avoiding flapping vibrations and low-frequency humming sounds.

Description

Technical Field

[0001] This invention relates to the field of heat pump system technology, and in particular to a method, controller and system for frequency reduction and vibration control of a household dual-supply system. Background Technology

[0002] The outdoor unit of a residential dual-source heat pump system (i.e., a residential air source heat pump system that provides both air conditioning cooling and underfloor heating / radiator heating) typically includes a compressor and an axial fan. In actual operation, it has been found that when the compressor's operating frequency is close to or equal to the axial fan's fundamental rotational frequency (or a harmonic thereof), their vibrations will superimpose on the outdoor unit's structure, causing a "beating vibration" phenomenon. This results in a significant low-frequency humming sound and overall unit vibration, affecting the user experience.

[0003] In existing technologies, compressors and axial fans are often controlled independently. For example, the compressor adjusts its frequency based on water temperature or indoor load, while the fan adjusts its speed based on condensing pressure or ambient temperature. There is no coordination mechanism between the two, making it impossible to actively avoid resonance caused by frequency overlap. Although some technologies control the fan by fixing and avoiding certain frequency points, they do not consider the influence of harmonics and cannot dynamically adjust the fan speed according to the real-time operating frequency of the compressor, resulting in unstable vibration reduction and noise reduction effects. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a control method capable of dynamically coordinating the operating frequencies of the compressor and the axial fan, and actively offsetting their fundamental and harmonic frequencies, thereby reducing vibration superposition at its source. Accordingly, the present invention provides a controller applying the above method, and a system incorporating the controller.

[0005] A method for frequency-interlocked vibration reduction control of a residential dual-supply system, applied to the controller of the outdoor unit of a residential dual-supply system, wherein the outdoor unit includes a compressor and an axial flow fan, the method comprising the following steps:

[0006] Step S1: Obtain the current operating frequency of the compressor;

[0007] Step S2: Determine the target rotational speed of the axial flow fan, specifically including:

[0008] Step S2.1: Obtain the current rotational speed of the axial flow fan and the number of blades of the axial flow fan;

[0009] Step S2.2: Calculate the fundamental frequency and its harmonics of the axial flow fan based on the current rotational speed and the number of blades;

[0010] Step S2.3: Compare the current operating frequency of the compressor with the rotary base frequency and its harmonics respectively, and determine whether at least one difference is 0 or within a preset range;

[0011] Step S2.4: If the judgment result of step S2.3 is negative, then the current rotation speed is determined as the target rotation speed;

[0012] Step S2.5: If the judgment result of step S2.3 is yes, then adjust the speed of the axial flow fan, and re-execute steps S2.2 to S2.3 based on the adjusted speed until the judgment result is no, and determine the last adjusted speed as the target speed;

[0013] Step S3: Control the axial flow fan to operate at the target speed.

[0014] Preferably, in step S2.5, adjusting the speed of the axial flow fan specifically includes the controller controlling the speed of the axial flow fan to increase or decrease by a preset step size, and after each adjustment, re-execute steps S2.2 to S2.3.

[0015] Preferably, in step S2.5, if the judgment result of step S2.3 is yes, a prompt message is issued to prompt the user to manually adjust the speed of the axial flow fan; the adjustment of the speed of the axial flow fan specifically includes the controller listening to the externally input adjusted speed of the axial flow fan.

[0016] Preferably, the method further includes the following steps before step S1:

[0017] The compressor's operating frequency is monitored in real time; when a change in the compressor's operating frequency is detected, steps S2 and S3 are triggered.

[0018] Preferably, step S2.2 specifically includes:

[0019] The fundamental frequency and harmonics of the axial flow fan are: frequency f = (n × Z × k) / 60, where n is the fan speed, Z is the number of blades, and k is a positive integer, with the value of k ranging from 1 to a preset value.

[0020] Preferably, step S3, controlling the axial flow fan to operate at the target speed, includes: the controller sending a speed command to the motor driver of the axial flow fan, the speed command including the target speed; and the motor driver adjusting the actual speed of the axial flow fan in response to the speed command.

[0021] A controller for a residential dual-supply outdoor unit includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the frequency-interlocking vibration reduction control method as described above.

[0022] A residential dual-supply system includes: an outdoor unit comprising a compressor and an axial fan; and a residential dual-supply outdoor unit controller as described above.

[0023] This solution acquires the compressor's current operating frequency in real time and calculates its fundamental frequency and harmonics based on the axial fan's current speed and number of blades. It proactively determines whether the compressor frequency and fan frequency (including harmonics) conflict or are too close; if so, resonance is identified. When resonance risk exists, the fan speed is actively adjusted, and this process is iteratively verified until the frequency mismatch condition is met. This method dynamically and accurately avoids the frequency overlap region between the compressor and fan, fundamentally eliminating flapping vibration and low-frequency humming. Compared to traditional independent control strategies, this method requires no changes to the hardware structure; significant vibration and noise reduction effects can be achieved solely through software algorithm and control logic optimization, greatly improving user comfort in residential dual-source heat pump products. Attached Figure Description

[0024] Figure 1 Layout diagram of the axial flow fan and compressor for the outdoor unit of a residential dual-supply system;

[0025] Figure 2 The flowchart illustrates the control method in this embodiment.

[0026] Figure label:

[0027] Compressor 1, axial flow fan 2. Detailed Implementation

[0028] The embodiments of the present invention are described in detail below.

[0029] This solution provides a method, controller, and system for frequency-interlocking vibration reduction control of a residential dual-supply system. The residential dual-supply system refers to a residential air-source heat pump dual-supply system that simultaneously provides air conditioning cooling and underfloor heating / radiator heating functions. Figure 1 As shown, the outdoor unit of a residential dual-supply system mainly includes a compressor, an axial fan, a heat exchanger, and a controller. The compressor and axial fan each generate their own vibration frequencies during operation. When their frequencies or their harmonics are close to or equal, a beat vibration phenomenon occurs, resulting in significant vibration and low-frequency noise from the outdoor unit.

[0030] This solution obtains the compressor's current operating frequency in real time through the controller, calculates its fundamental frequency and harmonics based on the current speed and number of blades of the axial fan, and determines whether there is a frequency conflict (i.e., the absolute value of the difference is less than the preset threshold or is 0). If there is a conflict, the fan speed is adjusted and recalculated until all frequencies are staggered, thereby avoiding resonance.

[0031] Example 1:

[0032] This embodiment discloses a method for frequency-linked vibration reduction control of a household dual-supply system, including the following steps:

[0033] Step S1: Obtain the current operating frequency of the compressor;

[0034] In step S1, the controller reads the compressor's operating frequency in real time through its internal communication interface. Since the compressors in household dual-supply systems are typically inverter-controlled, their operating frequency dynamically adjusts according to the indoor environment or set parameters. The controller monitors the compressor's operating frequency in real time.

[0035] Step S2: Determine the target rotational speed of the axial flow fan, specifically including:

[0036] Step S2.1: Obtain the current rotational speed of the axial flow fan and the number of blades of the axial flow fan;

[0037] Axial flow fans are typically brushless DC motors (BLDC). The controller obtains the current actual speed (in rpm) through Hall sensors or back EMF detection, or it can obtain it through feedback signals from the motor driver. The number of blades is a fixed, known parameter.

[0038] Step S2.2: Calculate the fundamental frequency and its harmonics of the axial flow fan based on the current rotational speed and the number of blades;

[0039] The fundamental frequency and harmonics of an axial flow fan are: frequency f = (n × Z × k) / 60, where n is the fan speed, Z is the number of blades, and k is a positive integer ranging from 1 to a preset value. k represents the harmonic order, k=1 is the fundamental frequency, k=2 is the second harmonic, and so on. For example, k=1 to 8 can cover the main vibration frequency range, which can be set according to actual needs.

[0040] Step S2.3: Compare the current operating frequency of the compressor with the rotary base frequency and its harmonics respectively, and determine whether at least one of the differences is zero or within a preset range;

[0041] This step assesses the risk of resonance conflict between the compressor's operating frequency and the fundamental and harmonic frequencies of the axial fan. The range of this conflict is determined through preliminary experiments to establish the aforementioned preset range.

[0042] Step S2.4: If the judgment result of step S2.3 is negative, then the current rotation speed is determined as the target rotation speed;

[0043] If the judgment result of step S2.3 is negative, it means that there will be no conflict, and the axial flow fan can run directly at the current speed.

[0044] Step S2.5: If the judgment result of step S2.3 is yes, then adjust the speed of the axial flow fan, and re-execute steps S2.2 to S2.3 based on the adjusted speed until the judgment result is no, and determine the last adjusted speed as the target speed;

[0045] There are two ways to adjust the rotation speed:

[0046] Automatic adjustment method: The controller increases or decreases by a preset step size (e.g., ±10 rpm) each time. For example, if the current speed is 450 rpm and higher than the minimum speed, the speed can be reduced. After each adjustment, the frequency is recalculated and judged until the condition is met. For example, the condition is met after adjusting to a speed of 420 rpm. At this time, the fundamental frequency is 21 Hz, and its harmonics are 42 Hz, 63 Hz, 84 Hz, 105 Hz, ... Therefore, the high-frequency rotation frequency of the compressor and the fundamental frequency and harmonics of the axial fan are mismatched. If the condition still cannot be met after traversing all allowable speed ranges, a fault prompt is given to the user.

[0047] Manual adjustment method: The controller issues prompts via a human-machine interface (such as a remote control, APP, or indicator lights and buzzers on the outdoor unit). Users can manually set a new fan speed value via the remote control or APP based on the specific prompts. The controller listens for the externally input speed value, uses it as the adjusted speed, and then re-executes steps 2.2 to 2.3. If a conflict still exists after re-evaluation, a prompt is issued again until the user inputs a speed that meets the requirements.

[0048] Step S3: Control the axial flow fan to operate at the target speed.

[0049] The controller generates speed commands (such as PWM duty cycle or serial digital commands) and sends them to the motor driver of the axial fan. The driver responds to the commands, adjusting the motor voltage / current to bring the actual fan speed to the target value. The controller can monitor the actual speed in a closed loop and make further fine adjustments if there is a deviation.

[0050] In a preferred embodiment, to reduce unnecessary calculations and adjustments, the controller may only execute steps S2 and S3 when the compressor operating frequency changes significantly. Specifically, the controller monitors the compressor's operating frequency changes in real time. When the frequency change exceeds a certain threshold (e.g., ±1 Hz) or the first sample after the frequency stabilizes, a complete frequency misalignment control process is triggered. At other times, the fan maintains the set target speed unless the compressor frequency changes again.

[0051] Example 2:

[0052] This embodiment discloses a controller for a residential dual-supply outdoor unit, including at least one processor and a memory communicatively connected thereto. The memory stores executable instructions, which, when executed by the processor, enable the control method described in Embodiment 1. The controller may also integrate a communication interface for communication with compressor inverters, fan drives, human-machine interface devices, etc.

[0053] Example 3:

[0054] This embodiment discloses a residential dual-supply system, including an outdoor unit, an indoor unit, and the controller described in Embodiment 2. The outdoor unit includes a compressor and an axial fan; the controller is installed in the electrical box of the outdoor unit. When the system is working, the controller performs frequency-shifting linkage control on the fan speed according to the described method to ensure that the vibration frequencies of the compressor and the fan are always staggered.

[0055] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for frequency-interlocked vibration reduction control of a residential dual-supply system, applied to the controller of the outdoor unit of a residential dual-supply system, wherein the outdoor unit includes a compressor and an axial flow fan, characterized in that, The method includes the following steps: Step S1: Obtain the current operating frequency of the compressor; Step S2: Determine the target rotational speed of the axial flow fan, specifically including: Step S2.1: Obtain the current rotational speed of the axial flow fan and the number of blades of the axial flow fan; Step S2.2: Calculate the fundamental frequency and its harmonics of the axial flow fan based on the current rotational speed and the number of blades; Step S2.3: Compare the current operating frequency of the compressor with the rotary base frequency and its harmonics respectively, and determine whether at least one difference is 0 or within a preset range; Step S2.4: If the judgment result of step S2.3 is negative, then the current rotation speed is determined as the target rotation speed; Step S2.5: If the judgment result of step S2.3 is yes, then adjust the speed of the axial flow fan, and re-execute steps S2.2 to S2.3 based on the adjusted speed until the judgment result is no, and determine the last adjusted speed as the target speed; Step S3: Control the axial flow fan to operate at the target speed.

2. The method for frequency-linked vibration reduction control of a household dual-supply system according to claim 1, characterized in that, In step S2.5, adjusting the speed of the axial flow fan specifically includes the controller controlling the speed of the axial flow fan to increase or decrease by a preset step size one time, and after each adjustment, re-execute steps S2.2 to S2.

3.

3. The method for frequency-linked vibration reduction control of a household dual-supply system according to claim 1, characterized in that, In step S2.5, if the judgment result of step S2.3 is yes, a prompt message is issued to prompt the user to manually adjust the speed of the axial flow fan; the adjustment of the speed of the axial flow fan specifically includes the controller listening to the externally input adjusted speed of the axial flow fan.

4. The method for frequency-interlocked vibration reduction control of a household dual-supply system according to claim 1, characterized in that, The procedure preceding step S1 also includes: The compressor's operating frequency is monitored in real time; when a change in the compressor's operating frequency is detected, steps S2 and S3 are triggered.

5. The method for frequency-linked vibration reduction control of a household dual-supply system according to claim 1, characterized in that, Step S2.2 specifically includes: The fundamental frequency and harmonics of the axial flow fan are: frequency f = (n × Z × k) / 60, where n is the fan speed, Z is the number of blades, and k is a positive integer, with the value of k ranging from 1 to a preset value.

6. The method for frequency-linked vibration reduction control of a household dual-supply system according to claim 1, characterized in that, Step S3, controlling the axial flow fan to operate at the target speed, includes: the controller sending a speed command to the motor driver of the axial flow fan, the speed command including the target speed; the motor driver adjusting the actual speed of the axial flow fan in response to the speed command.

7. A controller for a household dual-supply outdoor unit, characterized in that, include: At least one processor; The system includes a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, which are executed by the at least one processor to enable the at least one processor to perform the frequency-restricted vibration reduction control method according to any one of claims 1 to 6.

8. A household dual-supply system, characterized in that, include: The outdoor unit includes a compressor and an axial fan; And the household dual-supply outdoor unit controller as described in claim 7.

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