Silencer capable of automatically adjusting silencing amount

Abstract

The invention relates to the field of silencers, in particular to a silencer capable of automatically adjusting the silencing amount, noise data is collected in real time through a sensor and transmitted to a control system, the control system processes the noise data and outputs a control signal to an electric actuator, and the electric actuator drives an adjustable silencing piece to conduct angle adjustment around a hinge point. When the noise in the main power house is increased, the angle of the adjustable noise elimination sheet is adjusted to increase the noise elimination amount; and when the noise is reduced, the angle of the adjustable noise elimination sheet is adjusted to reduce the noise elimination amount and reduce the airflow resistance. The noise reduction amount of the silencer can dynamically change along with the field working condition, and the problem that the noise reduction amount of the thermal power plant main workshop ventilation opening silencer cannot be adjusted according to the field condition is solved.

Description

Technical Field

[0001] This invention relates to the field of silencer technology, and in particular to a silencer that automatically adjusts the amount of noise reduction. Background Technology

[0002] The silencers at the ventilation outlets of the main power plant are mainly used to reduce the noise generated by the equipment inside the main plant during operation, and to prevent it from affecting the surrounding environment of the plant area.

[0003] Currently, these silencers generally adopt a fixed plate structure, and their noise reduction performance is determined during the design phase and cannot be adjusted according to changes in actual operating conditions. Traditional silencers, due to their fixed noise reduction capacity, are often over-designed. Excessive silencer configuration leads to bulky equipment, high costs, and significantly increased energy consumption and operational disruptions in the power plant system due to excessive ventilation resistance. When the noise intensity within the main plant fluctuates due to operating load, equipment start-up and shutdown, the noise transmitted to the outside through ventilation openings also changes accordingly, resulting in unstable noise levels at the plant boundary and posing challenges to the overall noise control and management of the power plant.

[0004] Therefore, there is an urgent need for a silencer with automatic noise reduction that can be applied to the ventilation openings of the main plant of a thermal power plant to reduce the noise transmitted from the main plant to the external environment through the ventilation openings. Summary of the Invention

[0005] To address the issue that the noise reduction capacity of the silencers at the ventilation outlets of the main power plant cannot be adjusted according to the site conditions.

[0006] This invention provides a muffler with automatic noise reduction, comprising a fixed muffler, an adjustable muffler, a sensor, a control system, and an electric actuator; the adjustable muffler and the fixed muffler are hinged; the sensor and the control system are electrically connected for real-time noise data acquisition and transmission of noise data to the control system; the control system receives and processes the noise data and controls the electric actuator; the electric actuator drives the adjustable muffler to adjust its angle.

[0007] Preferably, one side of the adjustable sound-absorbing plate is hinged to the fixed sound-absorbing plate via a rotating shaft.

[0008] Preferably, the sensor is a noise sensor.

[0009] Preferably, the control system includes a signal processing unit, a logic control unit, and a drive output unit; the signal processing unit is used to filter and calculate the noise data to obtain the current noise value; the logic control unit has a pre-stored correspondence between the noise value and the target position of the adjustable noise damper, and the logic control unit is used to calculate the target position of the adjustable noise damper based on the current noise value and the preset external noise limit target; the drive output unit is used to generate a control signal based on the target position to drive the electric actuator.

[0010] Preferably, the electric actuator is a linear electric actuator.

[0011] Preferably, the muffler with automatic noise reduction also includes a connecting shaft, the output end of the electric actuator is fixedly connected to the drive shaft, one end of the connecting shaft is hinged to the drive shaft, and the other end of the connecting shaft is hinged to the movable end of the adjustable noise reduction plate.

[0012] The beneficial effects of this invention are reflected in the fact that noise data is collected in real time by sensors and transmitted to the control system. The control system processes the noise data and outputs a control signal to the electric actuator, which drives the adjustable silencer plate to adjust its angle around the hinge point. When the noise in the main plant increases, the angle of the adjustable silencer plate is adjusted to increase the noise reduction; when the noise decreases, the angle of the adjustable silencer plate is adjusted to reduce the noise reduction and reduce airflow resistance. This enables the silencer's noise reduction to dynamically change with the on-site operating conditions, solving the problem that the noise reduction of the silencer at the ventilation outlet of the main plant of a thermal power plant cannot be adjusted according to the on-site conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the muffler with automatic noise reduction adjustment in Embodiment 1 provided by the present invention.

[0014] Figure 2 The circuit connection diagram of the muffler with automatic noise reduction adjustment in Embodiment 2 of the present invention is shown in the figure.

[0015] Figure 3 This is a schematic diagram of the structure of the muffler with automatic noise reduction adjustment in Embodiment 3 of the present invention.

[0016] In the diagram: 1-Fixed silencer; 2-Adjustable silencer; 3-Sensor; 4-Control system; 41-Signal processing unit; 42-Logic control unit; 43-Drive output unit; 5-Electric actuator; 51-Drive shaft; 6-Rotating shaft; 7-Connecting shaft. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Example 1: Reference Figure 1A muffler with automatic noise reduction adjustment includes a fixed muffler 1, an adjustable muffler 2, a sensor 3, a control system 4, and an electric actuator 5; the adjustable muffler 2 and the fixed muffler 1 are hinged; the sensor 3 and the control system 4 are electrically connected for real-time noise data acquisition and transmission of noise data to the control system 4; the control system 4 receives and processes the noise data and controls the electric actuator 5; the electric actuator 5 drives the adjustable muffler 2 to adjust its angle.

[0019] Noise data is collected in real time by sensor 3 and transmitted to control system 4. Control system 4 processes the noise data and outputs a control signal to electric actuator 5. Electric actuator 5 drives adjustable silencer 2 to adjust its angle around the hinge point. When the noise in the main plant increases, the angle of adjustable silencer 2 is adjusted to increase the noise reduction; when the noise decreases, the angle of adjustable silencer 2 is adjusted to reduce the noise reduction and reduce airflow resistance. This enables the silencer's noise reduction to dynamically change with the on-site operating conditions, solving the problem that the noise reduction of the silencer at the ventilation outlet of the main plant of the thermal power plant cannot be adjusted according to the on-site conditions.

[0020] In some embodiments, one side of the adjustable muffler 2 is hinged to the fixed muffler 1 via a pivot 6.

[0021] By setting the rotating shaft 6, a rotation fulcrum is provided for the adjustable sound-absorbing plate 2, so that it can change the angle around the rotating shaft 6, thereby realizing the automatic adjustment of the sound-absorbing amount.

[0022] In some implementations, sensor 3 is a noise sensor 3.

[0023] Noise sensor 3 collects noise data in real time, providing a direct basis for the control system 4 to adjust the noise reduction amount.

[0024] In some implementations, the electric actuator 5 is a linear electric actuator 5.

[0025] By setting a linear electric actuator 5, the control signal is converted into a precise linear thrust or pull, thereby driving the adjustable silencer 2 to rotate around the axis and complete the angle adjustment.

[0026] Example 2: Reference Figure 2 The difference between this embodiment and Embodiment 1 is that the control system 4 includes a signal processing unit 41, a logic control unit 42, and a drive output unit 43; the signal processing unit 41 is used to filter and calculate the noise data to obtain the current noise value; the logic control unit 42 has a pre-stored correspondence between the noise value and the target position of the adjustable noise damper 2, and the logic control unit 42 is used to calculate the target position of the adjustable noise damper 2 according to the current noise value and the preset external noise limit target; the drive output unit 43 is used to generate a control signal according to the target position to drive the electric actuator 5.

[0027] The signal processing unit 41 converts the analog signal of the raw sound pressure collected by the noise sensor 3, which may contain environmental clutter or transient interference, into a digital signal. It then filters out specific frequency interference and calculates the equivalent continuous A-weighted sound level, converting it into a reliable value that accurately and stably reflects the current noise level. This provides a data basis for the control system 4 to make correct decisions and prevents misjudgments due to signal distortion or interference.

[0028] The logic control unit 42 first compares the current noise value provided by the signal processing unit 41 with the pre-stored external noise limit target, which is set according to the plant boundary emission standard, to determine whether the current noise exceeds the standard, meets the standard, or is too low. Then, based on the comparison result, it calls the pre-stored correspondence between the noise value and the target position to calculate the precise angle or position that the adjustable silencer 2 needs to reach in order to achieve or maintain the target noise level.

[0029] The signal processing unit 41, the logic control unit 42, and the drive output unit 43 work together to form a complete automatic control closed loop.

[0030] Example 3: Reference Figure 3 The difference between this embodiment and embodiment 1 is that the muffler with automatic noise reduction also includes a connecting shaft 7, the output end of the electric actuator 5 is fixedly connected to the drive shaft 51, one end of the connecting shaft 7 is hinged to the drive shaft 51, and the other end of the connecting shaft 7 is hinged to the movable end of the adjustable noise reduction plate 2.

[0031] By setting the connecting shaft 7, the linear motion of the actuator is converted into the rotational motion of the adjustable silencer 2, while automatically compensating for the alignment deviation and angle change generated during the motion, ensuring that the adjustment action is smooth and stable and minimizes mechanical wear.

[0032] Example 4: The difference between this embodiment and Embodiment 2 is that the signal processing unit 41 performs low-pass filtering on the original noise data to remove high-frequency interference noise. ;

[0033] in: This is the filtered noise value; It is the sound pressure level of the i-th frequency band, in Pa. Then the signal processing unit 41 calculates the current noise value: ;

[0034] Logic control unit 42 calculates the required noise reduction: ;

[0035] in: The required noise reduction; N is the current noise level; L is the preset external noise limit. Logic control unit 42 calculates the target angle: ;

[0036] in: From the perspective of the target; The required noise reduction is given by k; k is the muffler characteristic constant, in dB(A) / °, which is determined experimentally. The value of k depends on the structural design and material properties of the muffler. The formula for calculating k is: ;

[0037] in: To compare the sound absorption coefficients of fixed and adjustable sound-absorbing panel materials The relevant noise reduction coefficient typically ranges from 0.8 to 1.2. P is the cross-sectional perimeter of the muffler's airflow channel, typically ranging from 1.5 to 3.0 m. S represents the cross-sectional area of ​​the muffler's airflow channel, typically ranging from 0.1 to 0.3 m². 2 ; l represents the effective length of the muffler, typically ranging from 0.5 to 1.0 m. The actual k value was determined experimentally, with a typical range of 0.5~1.0 dB(A) / °.

[0038] The range of target angles is limited to: ;

[0039] in: , ; The drive output unit 43 generates control signals: ;

[0040] Where: MaxOutput is the maximum output value of electric actuator 5; This is a scaling factor that scales MaxOutput according to the proportion of the target angle to the maximum angle.

[0041]

[0042] Specific workflow: Initial state: N = 65 dB(A), L = 65 dB(A), = 0 dB(A), = 0° The system does not adjust the adjustable silencer 2.

[0043] When the noise is reduced to 50 dB(A): = 50 - 65 = -15 dB(A) < 0, = 0°, the system does not adjust the adjustable silencer 2.

[0044] When the noise increases to 85 dB(A): = 85 - 65 = 20 dB(A), = 20 / 0.5 = 40°, the system will adjust the adjustable silencing plate 2 to 40°.

[0045] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention. It will be clearly understood by those skilled in the art that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A muffler with automatically adjustable noise reduction, characterized in that: It includes a fixed noise-absorbing plate, an adjustable noise-absorbing plate, a sensor, a control system, and an electric actuator; the adjustable noise-absorbing plate and the fixed noise-absorbing plate are hinged; the sensor and the control system are electrically connected to collect noise data in real time and transmit the noise data to the control system; the control system is used to receive and process the noise data and control the electric actuator; the electric actuator is used to drive the adjustable noise-absorbing plate to adjust its angle.

2. The muffler with automatically adjustable noise reduction according to claim 1, characterized in that: One side of the adjustable sound-absorbing plate is hinged to the fixed sound-absorbing plate via a rotating shaft.

3. A muffler with automatically adjustable noise reduction according to claim 1, characterized in that: The sensor is a noise sensor.

4. A muffler with automatically adjustable noise reduction according to claim 1, characterized in that: The control system includes: The signal processing unit is used to filter and calculate the noise data to obtain the current noise value; The logic control unit has a pre-stored correspondence between noise values ​​and target positions of adjustable noise dampers. It is used to calculate the target position of the adjustable noise damper based on the current noise value and the preset external noise limit target. The drive output unit is used to generate control signals based on the target position to drive the electric actuator.

5. A muffler with automatically adjustable noise reduction according to claim 1, characterized in that: The electric actuator is a linear electric actuator.

6. A muffler with automatically adjustable noise reduction according to claim 1, characterized in that: It also includes a connecting shaft. The output end of the electric actuator is fixedly connected to the drive shaft. One end of the connecting shaft is hinged to the drive shaft, and the other end of the connecting shaft is hinged to the movable end of the adjustable silencer.

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