A noise reduction device for a heating and ventilation duct

Abstract

The utility model discloses a kind of noise reduction equipment for heating ventilation pipe, it is related to heating ventilation pipe noise reduction technical field.The equipment includes fixed plate, fixed plate four corners are equipped with the mounting plate of installation hole, inside recess is equipped with ball screw, ball screw outside is equipped with ball silk cover, left side is connected handle, ball silk cover lower end is connected limit plate through connecting block, limit plate rear end upper surface is connected moving block, outside is clamped with the noise reduction layer of noise reduction plate, lower end front and back side is connected connecting plate, fixed peg with nut and gasket is inserted in connecting plate, limit plate inside is wrapped pipeline body.Adjust the distance between two groups of arc limit plate by rotating handle, adapt to different diameter pipeline, rubber sound-absorbing convex strip in limit plate inside and the noise reduction layer of noise reduction plate synergistic effect, realize sound absorption, sound insulation double noise reduction, and noise reduction plate disassembly and assembly are convenient, and practicality is strong.The equipment compact structure, adjustment is flexible, effectively solve the noise problem in the operation of heating ventilation pipe, and the stable effect of noise reduction.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction technology for heating and ventilation ducts, specifically a noise reduction device for heating and ventilation ducts. Background Technology

[0002] During the operation of a heating, ventilation, and air conditioning system, the ductwork, as the core component for airflow delivery, generates aerodynamic noise due to high-speed airflow turbulence, valve throttling, and elbow vortex. At the same time, the vibration of the fan operation is transmitted through the duct wall, forming mechanical vibration noise. This noise can interfere with the indoor environment and affect people's work, life, and rest.

[0003] Existing noise reduction equipment for HVAC ducts is mostly of fixed size, making it difficult to adapt to ducts of different diameters and resulting in poor versatility. Some noise reduction devices only employ a single sound-absorbing or sound-insulating structure, offering limited noise reduction effects and failing to effectively cover mid-to-high frequency airflow noise and low-frequency vibration noise. Furthermore, most noise reduction devices are inconvenient to install and disassemble, hindering later maintenance and replacement of noise-reducing components. Long-term use can also lead to a decline in noise reduction performance due to component aging. Therefore, there is an urgent need for a noise reduction device for HVAC ducts that is highly adaptable, offers comprehensive noise reduction effects, and is easy to install and disassemble to solve these problems. Utility Model Content

[0004] The purpose of this utility model is to provide a noise reduction device for HVAC ducts, to solve the problems of poor adaptability, limited noise reduction effect, and inconvenient disassembly and assembly of existing HVAC duct noise reduction devices. To achieve the above objective, this utility model provides the following technical solution:

[0005] A noise reduction device for heating and ventilation ducts includes a fixed plate, on which mounting plates are fixedly connected to both the left and right sides. The mounting plates are used to stably install the entire noise reduction device in a designated position. Four mounting plates are distributed at the four corners of the fixed plate, and each mounting plate has mounting holes to facilitate the fixed assembly of the device using bolts or other fasteners.

[0006] The fixed plate has a groove at its front end, providing space for the installation and movement of the ball screw. The ball screw is housed inside the groove, with its right side rotatably connected to the inner wall of the groove on the fixed plate, ensuring stability during rotation. A ball sleeve is fitted onto the outer side of the ball screw, forming a helical transmission structure. Limiting sliders are fixedly connected to both the front and rear sides of the ball sleeve. A groove in the groove of the fixed plate mates with the limiting sliders, restricting the rotation of the ball sleeve to a linear motion only along the axial direction of the ball screw.

[0007] A handle is fixedly connected to the left side of the ball screw, allowing the operator to manually rotate the ball screw for convenient adjustment. A connecting block is fixedly connected to the lower end of the ball sleeve. A movable groove is provided on the fixed plate to cooperate with the connecting block, providing clearance for the movement of the connecting block and avoiding interference. A limit plate is fixedly connected to the lower end of the connecting block. Two sets of limit plates are provided, both with an arc-shaped structure and facing each other. One set of limit plates is fixedly connected to the right side of the lower surface of the fixed plate, while the upper end of the other set of limit plates is movably connected to the fixed plate via a movable block, allowing this set of limit plates to move synchronously with the connecting block.

[0008] A movable block is fixedly connected to the upper rear surface of the limiting plate. The movable block has a T-shaped structure and is movably engaged with the lower surface of the fixed plate. The fixed plate has a T-shaped groove that cooperates with the movable block. The T-shaped structure design further improves the stability of the limiting plate during movement and prevents it from shifting or falling off. Both sets of limiting plates have rubber sound-absorbing protrusions evenly distributed on the side near the pipe body. These protrusions are made of elastic rubber. When the two sets of limiting plates wrap around the outer surface of the pipe body, the rubber sound-absorbing protrusions can fit tightly against the outer wall of the pipe body. On the one hand, the elastic properties of the rubber material absorb the vibration energy of the pipe; on the other hand, the protrusion structure increases the contact area with sound waves, improving the sound absorption effect.

[0009] A noise-reducing plate is engaged with the outer side of the limiting plate. This noise-reducing plate also has an arc-shaped structure to match the shape of the limiting plate. The interior of the noise-reducing plate is filled with a noise-reducing layer, which can be made of high-efficiency sound-absorbing materials such as centrifugal glass wool or polyester fiber cotton, effectively absorbing noise transmitted to the outside of the limiting plate. The inner side of the noise-reducing plate is movably engaged with the outer surface of the limiting plate via trapezoidal locking blocks. The limiting plate has slots that mate with the trapezoidal locking blocks. This engaging structure design makes the installation and removal of the noise-reducing plate more convenient, facilitating future maintenance or replacement of the noise-reducing layer.

[0010] The lower end of the limiting plate is fixedly connected to connecting plates on both the front and rear sides. Two fixing bolts are inserted into the connecting plates, and threaded slots that mate with the fixing bolts are formed on the connecting plates. The threaded connection between the fixing bolts and the threaded slots securely locks the lower ends of the two sets of limiting plates. Each fixing bolt is fitted with two washers. One washer abuts against the nut and the limiting plate, and the other abuts against the limiting plate and the fixing bolt. The washers increase the contact area of ​​the connection, distribute pressure, and prevent loosening, thus improving the connection's firmness. A nut is fitted to the left side of each fixing bolt. Tightening the nut further strengthens the connection and prevents loosening during long-term use. A pipe body is located inside the limiting plate. The two sets of limiting plates, through the wrapping effect of the arc-shaped structure, limit and fix the pipe body. This, combined with rubber sound-absorbing strips and noise-reducing plates, forms a dual noise reduction structure.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention utilizes a helical transmission structure consisting of a ball screw and a ball sleeve. With the aid of a handle, the operator can rotate the handle to rotate the ball screw, which in turn drives the ball sleeve to move axially. The ball sleeve, via a connecting block, synchronously moves the limiting plate on the movable side, allowing for flexible adjustment of the distance between the two sets of limiting plates. Simultaneously, the dual guiding mechanism of the moving block and the T-shaped groove, as well as the limiting slider and the groove, ensures the stability and accuracy of the limiting plates during movement. This allows the equipment to adapt to heating and ventilation ducts of different diameters, effectively improving its versatility and solving the problem of poor compatibility in existing noise reduction equipment.

[0013] This invention utilizes the elastic properties of rubber to absorb pipe vibration by setting rubber sound-absorbing protrusions on the inner side of the limiting plate. At the same time, the protrusion structure increases the sound-absorbing area, achieving initial absorption of pipe vibration noise and some airflow noise. In addition, the noise reduction plate that is snapped onto the outer side of the limiting plate has a noise reduction layer inside that can further absorb noise that passes through the limiting plate, forming a dual noise reduction structure of sound absorption and sound insulation. This effectively covers mid-to-high frequency airflow noise and low frequency vibration noise, resulting in a more comprehensive and stable noise reduction effect.

[0014] In this invention, the noise reduction plate engages with the slots on the limiting plate via trapezoidal locking blocks. Compared to traditional bolt fixing methods, this makes disassembly and assembly more convenient, eliminating the need for complex tools. This facilitates later inspection, cleaning, or replacement of the noise reduction layer, reducing maintenance costs. Furthermore, the two sets of limiting plates are locked in place by the cooperation of fixing bolts and nuts, ensuring a secure connection and simple operation, further enhancing the ease of use of the equipment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a bottom sectional view of the fixing plate of this utility model;

[0018] Figure 3 This is an exploded view of the components of the limiting plate and noise reduction plate of this utility model.

[0019] Figure 4 This is an exploded structural diagram of the fixing bolt and nut components of this utility model.

[0020] In the diagram: 1. Fixed plate; 2. Mounting plate; 3. Ball screw; 4. Ball sleeve; 5. Handle; 6. Connecting block; 7. Limiting plate; 8. Moving block; 9. Noise reduction plate; 10. Connecting plate; 11. Fixing bolt; 12. Nut; 13. Pipe body. Detailed Implementation

[0021] 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.

[0022] Please refer to Figures 1-4. This utility model provides a technical solution: a noise reduction device for heating and ventilation ducts, including a fixed plate 1, with mounting plates 2 fixedly connected to both the left and right sides of the fixed plate 1. A groove is provided at the front end of the interior of the fixed plate 1, and a ball screw 3 is provided inside the groove. A ball sleeve 4 is sleeved on the outside of the ball screw 3. A handle 5 is fixedly connected to the left side of the ball screw 3. A connecting block 6 is fixedly connected to the lower end of the ball sleeve 4, and a limiting plate 7 is fixedly connected to the lower end of the connecting block 6. A moving block 8 is fixedly connected to the upper surface of the rear end of the limiting plate 7. A noise reduction plate 9 is engaged on the outside of the limiting plate 7. Connecting plates 10 are fixedly connected to both the front and rear sides of the lower end of the limiting plate 7, and a fixing bolt 11 is inserted into the moving block 8. A nut 12 is sleeved on the left side of the fixing bolt 11. A pipe body 13 is provided inside the limiting plate 7.

[0023] There are four mounting plates 2 in total, which are distributed at the four corners of the fixing plate 1. The mounting plates 2 are provided with mounting holes.

[0024] The right side of the ball screw 3 is rotatably connected to the groove of the fixed plate 1. Limiting sliders are fixedly connected to both the front and rear sides of the ball screw sleeve 4. A sliding groove that cooperates with the limiting slider is opened in the groove of the fixed plate 1. A moving groove that cooperates with the connecting block 6 is opened on the fixed plate 1.

[0025] The movable block 8 is configured in a T-shape and is movably engaged with the lower surface of the fixed plate 1. The fixed plate 1 has a T-shaped groove that cooperates with the movable block 8.

[0026] There are two sets of limiting plates 7. Both sets of limiting plates 7 are arranged in an arc-shaped structure and are distributed opposite each other. One set of limiting plates 7 is fixedly connected to the right side of the lower surface of the fixed plate 1. The upper end of the other set of limiting plates 7 is movably connected to the fixed plate 1 via the moving block 8 and the connecting block 6. Rubber sound-absorbing protrusions are evenly distributed on the side of both sets of limiting plates 7 near the pipe body 13. The two sets of limiting plates 7 wrap around the outer surface of the pipe body 13.

[0027] The noise reduction plate 9 is designed with an arc shape. The interior of the noise reduction plate 9 is filled with a noise reduction layer. The inner side of the noise reduction plate 9 is movably engaged with the outer surface of the limiting plate 7 by a trapezoidal locking block. The limiting plate 7 has a slot that cooperates with the trapezoidal locking block.

[0028] The connecting plate 10 is distributed at the lower end of the limiting plate 7 at both the front and rear ends. Two fixing bolts 11 are inserted into the connecting plate 10. The connecting plate 10 has threaded slots that cooperate with the fixing bolts 11. Each fixing bolt 11 is fitted with two washers. One washer abuts against the nut 12 and the limiting plate 7, and the other washer abuts against the limiting plate 7 and the fixing bolt 11.

[0029] Working principle

[0030] When using this noise reduction device for HVAC ducts, first adjust the distance between the two sets of limiting plates 7 according to the diameter of the duct body 13 to be noise-reduced. The operator rotates the handle 5 to drive the ball screw 3 to rotate in the groove of the fixed plate 1. Because the ball sleeve 4 is helically engaged with the ball screw 3, and the ball sleeve 4 is limited by the limiting sliders on the front and rear sides and the sliding groove in the groove, the ball sleeve 4 cannot rotate with the ball screw 3, but can only move linearly along the axis of the ball screw 3.

[0031] When the ball screw sleeve 4 moves, the connecting block 6 at the lower end drives the movable side limiting plate 7 connected to it to move synchronously. The moving block 8 at the rear end of the limiting plate 7 slides along the T-shaped groove on the lower surface of the fixed plate 1, further ensuring the stability of the movement of the limiting plate 7. After the distance between the two sets of limiting plates 7 is adjusted to match the diameter of the pipe body 13, the pipe body 13 is placed between the two sets of limiting plates 7, so that the rubber sound-absorbing protrusions on the inner side of the two sets of limiting plates 7 are tightly fitted to the outer wall of the pipe body 13.

[0032] Subsequently, align the connecting plates 10 at the lower ends of the two sets of limiting plates 7, pass the fixing bolts 11 through the connecting plates 10 on both sides and screw them into the threaded slots, put the gaskets on the fixing bolts 11 and tighten the nuts 12. The gaskets disperse the pressure and prevent loosening, so that the two sets of limiting plates 7 can firmly wrap and fix the pipe body 13.

[0033] Next, the noise reduction plate 9 is engaged with the inner trapezoidal locking block in the outer slot of the limiting plate 7, completing the installation of the noise reduction plate 9. At this time, the vibration generated by the operation of the pipe body 13 will be transmitted to the rubber sound-absorbing protrusion through the outer wall. The elastic properties of the rubber material can absorb some of the vibration energy and reduce the transmission of vibration noise. At the same time, the airflow noise in the pipe will radiate outward through the pipe wall. Some of the noise is absorbed by the rubber sound-absorbing protrusion, and the remaining noise is transmitted to the limiting plate 7 and further absorbed by the noise reduction layer inside the noise reduction plate 9, thereby achieving a dual noise reduction effect.

[0034] When maintenance or replacement of the noise reduction plate 9 is required, simply pull the noise reduction plate 9 outward to disengage the trapezoidal locking block from the slot of the limiting plate 7, and the noise reduction plate 9 can be removed. The operation is convenient and the maintenance efficiency is high. The entire device can be fixed in a designated position through the mounting holes on the mounting plate 2, ensuring stability during use and effectively solving the noise problem in the operation of the heating and ventilation duct.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended features rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the features be included within this invention. The scope of this invention is defined by its equivalents.

Claims

1. A noise reduction device for heating and ventilation ducts, comprising a fixing plate (1), characterized in that: Mounting plates (2) are fixedly connected to both the left and right sides of the fixing plate (1). A groove is provided at the front end of the interior of the fixing plate (1), and a ball screw (3) is provided inside the groove. A ball sleeve (4) is sleeved on the outside of the ball screw (3). A handle (5) is fixedly connected to the left side of the ball screw (3). A connecting block (6) is fixedly connected to the lower end of the ball sleeve (4), and a limiting plate (7) is fixedly connected to the lower end of the connecting block (6). A moving block (8) is fixedly connected to the upper surface of the rear end of the limiting plate (7). A noise reduction plate (9) is engaged on the outside of the limiting plate (7). A connecting plate (10) is fixedly connected to both the front and rear sides of the lower end of the limiting plate (7), and a fixing bolt (11) is inserted on the moving block (8). A nut (12) is sleeved on the left side of the fixing bolt (11). A pipe body (13) is provided on the inside of the limiting plate (7).

2. The noise reduction device for heating and ventilation ducts according to claim 1, characterized in that: There are four mounting plates (2), and the four mounting plates (2) are distributed at the four corners of the fixing plate (1). The mounting plates (2) are provided with mounting holes.

3. The noise reduction device for heating and ventilation ducts according to claim 1, characterized in that: The right side of the ball screw (3) is rotatably connected to the groove of the fixed plate (1). The front and rear sides of the ball sleeve (4) are fixedly connected to the limit slider. The groove of the fixed plate (1) is provided with a sliding groove that cooperates with the limit slider. The fixed plate (1) is provided with a moving groove that cooperates with the connecting block (6).

4. The noise reduction device for heating and ventilation ducts according to claim 1, characterized in that: The movable block (8) is configured in a T-shape and is movably engaged with the lower surface of the fixed plate (1). The fixed plate (1) has a T-shaped groove that cooperates with the movable block (8).

5. The noise reduction device for heating and ventilation ducts according to claim 1, characterized in that: Two sets of limiting plates (7) are provided. Both sets of limiting plates (7) are arranged in an arc-shaped structure and are distributed opposite each other. One set of limiting plates (7) is fixedly connected to the right side of the lower surface of the fixed plate (1). The upper end of the other set of limiting plates (7) is movably connected to the fixed plate (1) through the moving block (8) and the connecting block (6). Rubber sound-absorbing protrusions are evenly distributed on the side of both sets of limiting plates (7) near the pipe body (13). The two sets of limiting plates (7) are wrapped around the outer surface of the pipe body (13).

6. The noise reduction device for heating and ventilation ducts according to claim 1, characterized in that: The noise reduction plate (9) is arranged in an arc shape. The interior of the noise reduction plate (9) is filled with a noise reduction layer. The inner side of the noise reduction plate (9) is movably engaged with the outer surface of the limiting plate (7) by a trapezoidal card block. The limiting plate (7) has a card slot that cooperates with the trapezoidal card block.

7. The noise reduction device for heating and ventilation ducts according to claim 1, characterized in that: The connecting plate (10) is distributed at the front and rear ends of the lower end of the limiting plate (7). Two fixing bolts (11) are inserted on the connecting plate (10). The connecting plate (10) has a threaded slot that matches the fixing bolt (11). Each fixing bolt (11) is fitted with two washers. One washer abuts against the nut (12) and the limiting plate (7), and the other washer abuts against the limiting plate (7) and the fixing bolt (11).

Images