Silent variable frequency generator set

Abstract

The utility model discloses a mute type frequency conversion generator set, including sound insulation box and internal generator set. Sound insulation box's air inlet is equipped with adjustable air inlet subassembly, and its core is composed of fixed first grating strip and movable second grating strip, both are U-shaped section and inboard pasting sound insulation cotton, and are mutually staggered and nested. Through drive mechanism drive the movable frame of bearing second grating strip moves relative to fixed frame, changes both nested depth, thereby dynamic regulation air inlet passage structure: close when form long and tortuous labyrinth passage to realize high -efficient mute, when far away, form short and unobstructed passage to preferentially guarantee heat dissipation. The utility model still is equipped with control unit, can according to generator set load, internal temperature etc. parameter automatic control drive mechanism action, and the intelligent balance mute and heat dissipation demand, has solved the contradiction of traditional mute generator set two difficult to take into account fundamentally.

Description

Technical Field

[0001] This utility model relates to the field of generator set technology, specifically to a silent variable frequency generator set. Background Technology

[0002] Generator sets, as important backup and mobile power sources, are widely used in industrial production, construction, emergency response, commercial activities, and residential life. However, the strong aerodynamic and mechanical noise generated by traditional generator sets during operation can cause serious noise pollution, affecting the health of operators and disturbing residents. To address this issue, the industry commonly uses soundproof enclosures for generator sets. However, while effectively reducing noise, soundproof enclosures also introduce an inherent technical contradiction: the conflict between heat dissipation requirements and quiet operation requirements. Generator sets generate a large amount of heat during operation, which must be cooled through continuous air intake and exhaust. To ensure quiet operation, the air intake of the soundproof enclosure usually needs to be designed with a complex structure, such as a fixed labyrinthine sound-absorbing channel or a microperforated plate structure, to increase sound wave reflection and absorption. However, these fixed air intake channels inevitably generate significant ventilation resistance, making it difficult to simultaneously meet heat dissipation requirements and quiet operation. Utility Model Content

[0003] The problem solved by this utility model is that it is difficult to balance the heat dissipation requirements and quiet operation of traditional generator sets, and a quiet variable frequency generator set is provided.

[0004] This utility model is achieved through the following technical solution: a silent variable frequency generator set, comprising a soundproof box and an internal generator set.

[0005] The soundproof enclosure is equipped with an air inlet, and an adjustable air inlet assembly is provided at the air inlet.

[0006] The adjustable air intake assembly includes:

[0007] A fixed frame is fixed at the air inlet.

[0008] The first grille strip, consisting of several U-shaped strips, is fixed parallel to each other and spaced apart on a fixed frame. Sound-absorbing cotton is applied to the inner U-shaped surface of the first grille strip, and the U-shaped opening of the first grille strip faces inwards towards the soundproof enclosure.

[0009] The movable frame is movably installed inside the soundproof box and arranged parallel to the fixed frame.

[0010] The drive mechanism is capable of driving the movable frame to move closer to or further away from the fixed frame.

[0011] The second grille strip has several U-shaped sections, which are fixed to the movable frame in parallel and at intervals. The spacing between them is the same as that between the first grille strips. Sound insulation cotton is applied to the inner side of the U-shape of the second grille strip. The U-shaped opening of the second grille strip faces outward from the soundproof box. The U-shaped edges of the second grille strip and the first grille strip extend into each other's U-shaped openings without contacting each other. When the drive mechanism moves the relatively fixed frame closer or further away, it can change the horizontal distance between the first grille strip and the second grille strip.

[0012] Furthermore, it also includes a control unit electrically connected to the drive mechanism, which is used to control the operation of the drive mechanism according to at least one of the following parameters: the output power of the generator set, the operating frequency, the internal temperature of the soundproof enclosure, or the external ambient noise level.

[0013] Furthermore, the control unit is configured to:

[0014] When the generator set is in low load or silent mode, the movable frame is controlled to move closer to the fixed frame to form a long and tortuous air intake channel.

[0015] When the generator set is under high load or the internal temperature of the soundproof box exceeds the threshold, the movable frame is controlled to move away from the fixed frame to form a short and unobstructed air intake channel.

[0016] Furthermore, a temperature sensor is installed inside the soundproof box.

[0017] Furthermore, the movable frame and the fixed frame are hinged by several swing arms of the same length. One end of each swing arm is hinged to the fixed frame and the other end is hinged to the movable frame. The drive mechanism includes an electric push rod. The fixed end of the electric push rod is hinged to the soundproof box and the other end is hinged to the movable box.

[0018] Furthermore, the length of the first grille bar at least covers the height of the air intake, and the length of the second grille bar is longer than the length of the first grille bar.

[0019] Furthermore, the electric actuator has position feedback.

[0020] The beneficial effects of this utility model are:

[0021] 1. The core improvement of this utility model lies in the adjustable air intake assembly of the air inlet. This assembly consists of a fixed first grille bar and a movable second grille bar nested in an alternating pattern. When strong noise reduction is required: the drive mechanism pushes the movable frame closer to the fixed frame. At this time, the depth to which the first and second grille bars extend into each other's U-shaped openings increases, forming a longer and more tortuous labyrinthine air intake channel. When air passes through this channel, sound waves need to undergo multiple reflections and absorptions, and their energy is significantly attenuated, thus achieving efficient noise reduction. When strong heat dissipation is required: the drive mechanism pulls the movable frame away from the fixed frame. At this time, the nesting portion of the first and second grille bars is reduced, and the ventilation channel formed between them becomes shorter and straighter, significantly reducing ventilation resistance, thereby allowing more cooling air to quickly enter the soundproof box and provide sufficient cooling for the generator set. Sound-absorbing cotton is applied to the inner U-shaped sides of both the first and second grille bars, further enhancing the sound wave absorption effect within the channel. The U-shaped openings, with their opposite directions, ensure that the airflow channel is always encased in sound insulation material, regardless of the position of the movable frame. This fundamentally solves the contradiction between quiet operation and heat dissipation in traditional silent generator sets.

[0022] 2. This utility model includes a control unit electrically connected to the drive mechanism. The control unit controls the drive mechanism's operation based on at least one parameter selected from the generator set's output power, operating frequency, internal temperature of the soundproof enclosure, or external ambient noise level. The drive mechanism pushes the movable frame according to instructions, causing it to move relative to the fixed frame. The control unit analyzes these parameters according to a preset algorithm and automatically sends instructions to the drive mechanism to adjust the position of the movable frame. This achieves unattended automatic adjustment of the intake system, requiring no manual intervention, thus improving the product's intelligence level and user experience.

[0023] 3. The movable frame and fixed frame of this utility model are hinged together by several swing arms of equal length. One end of each swing arm is hinged to the fixed frame, and the other end is hinged to the movable frame. The driving mechanism includes an electric push rod, the fixed end of which is hinged to the soundproof box, and the other end to the movable box. This design uses a set of swing arms of equal length to hinge the movable frame to the fixed frame, forming a parallelogram-shaped motion mechanism. This ensures the stability and accuracy of the movable frame's translation, preventing it from jamming or tilting. An electric push rod is used as the power source. One end of the electric push rod is hinged to the soundproof box, and the other end is hinged to the movable frame. When the push rod extends or retracts, it pushes the movable frame, ensuring that it maintains a parallel posture to the fixed frame during translational movement under the constraint of the swing arms. The mechanical structure is simple, robust, and durable, suitable for long-term operation in the vibration environment of generator sets. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the structure of a silent variable frequency generator set according to the present invention;

[0025] Figure 2 This is a front view of the adjustable air intake assembly described in this utility model;

[0026] Figure 3 This is a rear view of the adjustable air intake assembly described in this utility model;

[0027] Figure 4 This is a top view of the adjustable air intake assembly described in this utility model;

[0028] Figure 5 This is a left view of the adjustable air intake assembly described in this utility model.

[0029] In the diagram: 1. Soundproof box; 101. Air inlet; 2. Fixed frame; 3. First grille bar; 4. Movable frame; 5. Second grille bar; 6. Swing arm; 7. Drive mechanism. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figure 1-5 As shown, a silent variable frequency generator set includes a soundproof enclosure 1 and an internal generator set.

[0032] The soundproof enclosure 1 is provided with an air inlet 101, and an adjustable air inlet assembly is provided at the air inlet 101.

[0033] The adjustable air intake assembly includes:

[0034] Fixed frame 2, the fixed frame 2 is fixed at the air inlet 101,

[0035] The first grille strip 3, consisting of several U-shaped strips, is fixed parallel to each other and spaced apart on the fixed frame 2. Sound-absorbing cotton is applied to the inner U-shaped surface of the first grille strip 3, and the U-shaped opening of the first grille strip 3 faces inwards towards the soundproof box 1.

[0036] The movable frame 4 is movably installed inside the soundproof box 1 and arranged parallel to the fixed frame 2.

[0037] Drive mechanism 7, which can drive the movable frame 4 to move closer to or further away from the fixed frame 2.

[0038] The second grille strip 5 has several U-shaped sections, which are fixed to the movable frame 4 in parallel and at intervals. The spacing between them is the same as that between the first grille strips 3. The inner side of the U-shape of the second grille strip 5 is covered with sound insulation cotton. The U-shaped opening of the second grille strip 5 faces outward from the sound insulation box 1. The U-shaped edges of the second grille strip 5 and the first grille strip 3 extend into each other's U-shaped openings without contacting each other. When the driving mechanism 7 drives the relatively fixed frame 2 to move closer or further away, it can change the horizontal distance between the first grille strip 3 and the second grille strip 5.

[0039] The core improvement of this invention lies in the adjustable air intake assembly of the air intake 101. This assembly consists of a fixed first grille bar 3 and a movable second grille bar 5 nested in an alternating pattern. When strong noise reduction is required: the drive mechanism 7 pushes the movable frame 4 closer to the fixed frame 2. At this time, the depth to which the first and second grille bars 5 extend into each other's U-shaped openings increases, forming a longer and more tortuous labyrinthine air intake channel. When air passes through this channel, sound waves need to undergo multiple reflections and absorptions, and their energy is significantly attenuated, thus achieving efficient noise reduction. When strong heat dissipation is required: the drive mechanism 7 pulls the movable frame 4 away from the fixed frame 2. At this time, the nesting portion of the first and second grille bars 5 is reduced, and the ventilation channel formed between them becomes shorter and straighter, significantly reducing ventilation resistance, thereby allowing more cooling air to quickly enter the soundproof box 1, providing sufficient cooling for the generator set. The inner sides of the U-shapes of both the first grille bar 3 and the second grille bar 5 are lined with sound-absorbing cotton, further enhancing the sound wave absorption effect within the channel. The design of the U-shaped openings facing opposite directions ensures that the airflow channel is always wrapped with sound-absorbing material regardless of the position of the movable frame 4. This fundamentally solves the contradiction between quiet operation and heat dissipation in traditional silent generator sets.

[0040] In practical applications, a control unit is also included. This control unit is electrically connected to the drive mechanism 7 and controls the operation of the drive mechanism 7 based on at least one parameter: the generator set's output power, operating frequency, the internal temperature of the soundproof enclosure 1, or the external ambient noise level. The drive mechanism 7 pushes the movable frame 4 according to instructions, causing it to move relative to the fixed frame 2. The control unit analyzes these parameters according to a preset algorithm and automatically sends instructions to the drive mechanism 7 to adjust the position of the movable frame 4. This achieves unattended automatic adjustment of the intake system, requiring no manual intervention, thus improving the product's intelligence level and user experience.

[0041] In practical applications, the control unit is configured as follows:

[0042] When the generator set is in low load or silent mode, the movable frame 4 is controlled to move to a position close to the fixed frame 2 to form a long and tortuous air intake channel.

[0043] When the generator set is under high load or the internal temperature of the soundproof box 1 exceeds the threshold, the movable frame 4 is controlled to move away from the fixed frame 2 to form a short and unobstructed air intake channel.

[0044] This solution provides clear and executable control logic, making the design of the automatic control system based on sound principles. It ensures that the generator set can operate under optimal "quiet-heat dissipation" configuration under any operating conditions, making it both environmentally friendly and efficient.

[0045] In practical applications, a temperature sensor is installed inside the soundproof enclosure 1. This sensor continuously monitors the ambient temperature inside the generator compartment or the temperature of key components (such as the engine block and generator windings), and transmits the signal to the control unit in real time. Based on direct temperature feedback control, the response is rapid, and it can most effectively prevent the equipment from overheating.

[0046] In practical applications, the movable frame 4 and the fixed frame 2 are hinged together by several swing arms 6 of equal length. One end of each swing arm 6 is hinged to the fixed frame 2, and the other end is hinged to the movable frame 4. The drive mechanism 7 includes an electric push rod, the fixed end of which is hinged to the soundproof box 1, and the other end to the movable box. This design uses a set of swing arms 6 of equal length to hinge the movable frame 4 to the fixed frame 2, forming a parallelogram-shaped motion mechanism that ensures the stability and accuracy of the movable frame 4's translation, preventing it from jamming or tilting. An electric push rod is used as the power source. One end of the electric push rod is hinged to the soundproof box 1, and the other end is hinged to the movable frame 4. When the push rod extends or retracts, it pushes the movable frame 4, ensuring that it maintains a parallel orientation to the fixed frame 2 during translational movement under the constraint of the swing arms 6. The mechanical structure is simple, robust, and durable, suitable for long-term operation in generator set vibration environments.

[0047] In practical applications, the length of the first grille strip 3 at least covers the height of the air inlet 101, and the length of the second grille strip 5 is longer than the length of the first grille strip 3. The first grille strip 3 covers the height of the air inlet 101, ensuring that the entire air intake area is effectively treated. The second grille strip 5 is longer so that even when the movable frame 4 is away, a portion of it can still remain nested with the first grille strip 3, maintaining the basic structure of the channel and preventing complete loss of sound insulation or the formation of a straight path in the maximum ventilation mode.

[0048] In practical applications, the electric actuator features position feedback. It can transmit the extension / retraction length of the actuator (i.e., the position of the movable frame 4) to the control unit in real time. This enables precise closed-loop control of the movable frame 4's position, allowing the control unit to accurately determine whether it is in "fully open," "fully closed," or any intermediate position. This facilitates fault diagnosis and precise position memory (such as storing multiple preset positions), enhancing the system's intelligence and reliability.

[0049] In summary, the silent variable frequency generator set described in this utility model fundamentally solves the contradiction between quiet operation and heat dissipation in traditional silent generator sets through the adjustable air intake component of the air intake 101.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments are only for illustrating the technical concept and characteristics of this utility model, and are intended to enable those skilled in the art to understand and implement the content of this utility model. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A silent variable frequency generator set, characterized in that: Includes a soundproof enclosure (1) and an internal generator set, The soundproof box (1) is provided with an air inlet (101), and an adjustable air inlet component is provided at the air inlet (101). The adjustable air intake assembly includes: A fixed frame (2) is fixed at the air inlet (101). The first grille strip (3) has several U-shaped sections, which are fixed to the fixed frame (2) in parallel and at intervals. The inner side of the U-shape of the first grille strip (3) is covered with sound insulation cotton, and the U-shaped opening of the first grille strip (3) faces into the sound insulation box (1). The movable frame (4) is movably installed inside the soundproof box (1) and arranged parallel to the fixed frame (2). The drive mechanism (7) is capable of driving the movable frame (4) to move closer to or further away from the fixed frame (2). The second grille strip (5) has several U-shaped sections, which are fixed to the movable frame (4) in parallel and at intervals. The spacing is the same as that between the first grille strip (3). The inner side of the U-shape of the second grille strip (5) is covered with sound insulation cotton. The U-shaped opening of the second grille strip (5) faces outward from the soundproof box (1). The U-shaped sides of the second grille strip (5) and the first grille strip (3) extend into each other's U-shaped openings and do not contact each other. When the driving mechanism (7) drives the relatively fixed frame (2) to move closer or further away, it can change the horizontal distance between the first grille strip (3) and the second grille strip (5).

2. The silent variable frequency generator set according to claim 1, characterized in that: It also includes a control unit, which is electrically connected to the drive mechanism (7) and is used to control the operation of the drive mechanism (7) according to at least one of the following parameters: the output power of the generator set, the operating frequency, the internal temperature of the soundproof box (1) or the external ambient noise level.

3. A silent variable frequency generator set according to claim 2, characterized in that: The control unit is configured to: When the generator set is in low load or silent mode, the movable frame (4) is controlled to move to a position close to the fixed frame (2) to form a long and tortuous air intake channel; When the generator set is under high load or the internal temperature of the soundproof box (1) exceeds the threshold, the movable frame (4) is controlled to move to a position away from the fixed frame (2) to form a short and unobstructed air intake channel.

4. A silent variable frequency generator set according to claim 2, characterized in that: A temperature sensor is installed inside the soundproof box (1).

5. A silent variable frequency generator set according to claim 1, characterized in that: The movable frame (4) and the fixed frame (2) are hinged by several swing arms (6) of the same length. One end of the swing arm (6) is hinged to the fixed frame (2) and the other end is hinged to the movable frame (4). The drive mechanism (7) includes an electric push rod. The fixed end of the electric push rod is hinged to the soundproof box (1) and the other end is hinged to the movable box.

6. A silent variable frequency generator set according to claim 1, characterized in that: The length of the first grille bar (3) covers at least the height of the air inlet (101), and the length of the second grille bar (5) is longer than the length of the first grille bar (3).

7. A silent variable frequency generator set according to claim 5, characterized in that: The electric actuator has position feedback.

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