Silencing device for ventilation air conditioner

Abstract

The utility model discloses a silencing device for a ventilation air conditioner, and relates to the technical field of ventilation air conditioner equipment, the silencing device comprises a ventilation pipe and a butt joint silencing pipe, the ventilation pipe and the butt joint silencing pipe are detachably and fixedly connected through a flange, and the inner wall of the butt joint silencing pipe close to one end is provided with a resistant silencing chamber. A resonance silencing assembly is arranged on the inner wall, close to the other end, of the butt joint silencing pipe, a silencing cavity is formed in the inner wall of the resistant silencing chamber, a plurality of through holes are formed in the inner wall of the silencing cavity, and the resonance silencing assembly comprises a first resonance plate and a second resonance plate. The included angle between the first resonance plate and the inner wall of the butt-joint silencing pipe and the included angle between the second resonance plate and the inner wall of the butt-joint silencing pipe can be changed through the power adjusting assembly, so that the acoustic characteristics of the resonance cavity are adjusted, noise of different frequencies can be effectively reduced, the adaptability of the silencing device to noise of a ventilation air conditioning system under different working conditions is improved, and the noise reduction effect is good. And a good silencing effect can be realized in a relatively wide frequency range.

Description

TECHNICAL FIELD

[0001] The utility model relates to a ventilation and air conditioning equipment technical field, specifically related to a ventilation and air conditioning use silencer. BACKGROUND

[0002] In modern building environment, ventilation and air conditioning system is widely used in various places, such as commercial building, hospital, hotel, office building and industrial plant etc. It plays a vital role in providing comfortable air environment, adjusting temperature and humidity and ensuring air quality for indoor space. However, the ventilation and air conditioning system inevitably produces noise in the operation process, which brings many troubles to people's life, work and study, and has serious influence in some high acoustic environment requirement fields.

[0003] The noise source of ventilation and air conditioning system is relatively complex, mainly including fan operation noise, air flow noise and equipment vibration noise etc. The fan as the core power component of ventilation and air conditioning system, the air dynamic noise produced by the high-speed rotation of its blade covers a wide frequency range, from low-frequency hum to high-frequency screech. For example, the low-frequency noise of large centrifugal fan can produce resonance influence on building structure, while the high-frequency noise of small axial fan can cause people's auditory discomfort. At the same time, when air flows in the ventilation duct, due to the friction of duct, airflow disturbance of elbow and variable diameter, etc., noise of different degrees will also be produced. In addition, the mechanical vibration of equipment is transmitted through the duct and connecting piece, further aggravating the noise pollution of the whole system. SUMMARY

[0004] The utility model aims at providing a ventilation and air conditioning use silencer to solve the problems raised in the above background.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of:

[0006] A ventilation and air conditioning use silencer, comprising a ventilation pipe and a butt joint silencer pipe, the ventilation pipe and the butt joint silencer pipe are detachably fixedly connected through flanges;

[0007] The inner wall of the butt joint silencer pipe near one end is provided with a resistance sound absorption chamber, and the inner wall of the butt joint silencer pipe near the other end is provided with a resonance silencing assembly;

[0008] The inner wall of the resistance sound absorption chamber is provided with a sound absorption cavity, the inner wall of the sound absorption cavity is provided with a plurality of through holes, the resonance silencing assembly comprises a first resonance plate and a second resonance plate, and the resonance silencing assembly further comprises a power adjusting assembly for adjusting the included angle degrees of the first resonance plate and the second resonance plate with the inner wall of the butt joint silencer pipe.

[0009] The further improvement in the utility model technical scheme lies in that: the power adjusting assembly comprises an electric push rod and a transmission rod, one end of the transmission rod is fixedly connected with one end of the electric push rod, a rotating arm one is fixedly connected at the top center of the first resonance plate, a rotating arm two is fixedly connected at the top center of the second resonance plate, rotating rods are fixedly connected to the bottom surfaces of the rotating arm one and the rotating arm two, and the bottom end of the rotating rod is rotationally connected with the inner wall bottom of the butt joint sound elimination pipe.

[0010] The further improvement in the utility model technical scheme lies in that: the outer walls of the first resonance plate and the second resonance plate are provided with a plurality of resonance holes.

[0011] The further improvement in the utility model technical scheme lies in that: one end of the transmission rod is rotationally connected with one end of the rotating arm one, a transmission connecting rod is rotationally connected with one end of the rotating arm two, the other end of the rotating arm one is rotationally connected with an auxiliary connecting rod, one end of the auxiliary connecting rod is rotationally connected with one end of the rotating arm two, and the transmission connecting rod and the auxiliary connecting rod are cross-distributed between the rotating arm one and the rotating arm two.

[0012] The further improvement in the utility model technical scheme lies in that: one side of the auxiliary connecting rod is provided with a sliding groove for adapting the transmission connecting rod, and the inner wall of the sliding groove is slidingly connected with the outer wall of the transmission connecting rod.

[0013] The further improvement in the utility model technical scheme lies in that: the inner wall of the butt joint sound elimination pipe is fixedly connected with a sound absorption adhesive layer.

[0014] The further improvement in the utility model technical scheme lies in that: the outer wall of the resistance sound elimination chamber is fixedly connected with a mounting sealing frame.

[0015] Due to the adoption of the above technical scheme, the utility model has the following technical progress compared with the prior art:

[0016] 1. The utility model provides a sound elimination device for ventilating and air conditioning, through the power adjusting assembly, the included angle degrees of the first resonance plate and the second resonance plate with the inner wall of the butt joint sound elimination pipe can be changed, so that the acoustic characteristics of the resonance cavity are adjusted, different frequency noises can be effectively reduced, the adaptability of the sound elimination device to the noise of the ventilating and air conditioning system under different working conditions is improved, and good sound elimination effect can be realized in a wide frequency range.

[0017] 2.The ventilation and air conditioning system noise elimination device provided by the utility model has a multi-level noise elimination system, which can comprehensively reduce the noise generated by the ventilation and air conditioning system, effectively improve the acoustic quality of the surrounding environment, and is suitable for various places with strict noise requirements. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The utility model discloses a structure schematic diagram;

[0019] Figure 2 The utility model discloses a butt joint sound elimination pipe structure schematic diagram;

[0020] Figure 3 The utility model discloses a resonance sound elimination assembly structure schematic diagram;

[0021] Figure 4 The utility model discloses an A place structure amplification schematic diagram.

[0022] In the drawing: 1, ventilation pipe, 2, butt joint sound elimination pipe, 3, install sealed frame, 4, sound elimination cavity, 5, resonance sound elimination assembly, 6, sound absorption coating, 7, first resonance board, 8, second resonance board, 9, electric push rod, 10, transmission rod, 11, rotating rod, 12, rotary arm one, 13, transmission connecting rod, 14, auxiliary connecting rod, 15, rotary arm two. DETAILED DESCRIPTION

[0023] In the description of the utility model, it also needs to be explained that unless there is explicit provision and limitation, the terms "arrangement", "installation", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] The utility model will be further explained in detail in combination with examples as follows: Example 1

[0025] As Figures 1-4 The utility model provides a ventilation and air conditioning system noise elimination device, including ventilation pipe 1 and butt joint sound elimination pipe 2, ventilation pipe 1 and butt joint sound elimination pipe 2 are detachably fixedly connected through flange;

[0026] The inner wall close to one end of butt joint sound elimination pipe 2 is provided with resistance sound elimination chamber, and the inner wall close to the other end of butt joint sound elimination pipe 2 is provided with resonance sound elimination assembly 5;

[0027] The inner wall of the resistant soundproof room is provided with sound absorption cavities 4, the inner wall of the sound absorption cavity 4 is provided with a plurality of through holes, the resonance sound absorption assembly 5 comprises a first resonance plate 7 and a second resonance plate 8, and the resonance sound absorption assembly 5 further comprises a power adjusting assembly for adjusting the included angle between the first resonance plate 7 and the second resonance plate 8 and the inner wall of the butt-joint sound absorption pipe 2.

[0028] The power adjusting assembly comprises an electric push rod 9 and a transmission rod 10, one end of the transmission rod 10 is fixedly connected with one end of the electric push rod 9, the top center of the first resonance plate 7 is fixedly connected with a rotating arm one 12, the top center of the second resonance plate 8 is fixedly connected with a rotating arm two 15, the bottom surfaces of the rotating arm one 12 and the rotating arm two 15 are both fixedly connected with rotating rods 11, and the bottom ends of the rotating rods 11 are rotationally connected with the bottom of the inner wall of the butt-joint sound absorption pipe 2.

[0029] The outer walls of the first resonance plate 7 and the second resonance plate 8 are both provided with a plurality of resonance holes.

[0030] One end of the transmission rod 10 is rotationally connected with one end of the rotating arm one 12, the end, close to the transmission rod 10, of the rotating arm one 12 is rotationally connected with a transmission connecting rod 13, one end of the transmission connecting rod 13 is rotationally connected with one end of the rotating arm two 15, the end, away from the transmission rod 10, of the rotating arm one 12 is rotationally connected with an auxiliary connecting rod 14, the end, away from the rotating arm one 12, of the auxiliary connecting rod 14 is rotationally connected with one end of the rotating arm two 15, and the transmission connecting rod 13 and the auxiliary connecting rod 14 are cross-distributed between the rotating arm one 12 and the rotating arm two 15. Embodiment 2

[0031] As Figures 1-4 shown, on the basis of embodiment 1, the utility model provides a technical scheme: preferably, one side of the auxiliary connecting rod 14 is provided with a sliding groove for adapting the transmission connecting rod 13, and the inner wall of the sliding groove is slidingly connected with the outer wall of the transmission connecting rod 13.

[0032] The inner wall of the butt-joint sound absorption pipe 2 is fixedly connected with a sound absorption coating layer 6.

[0033] The outer wall of the resistant soundproof room is fixedly connected with a mounting sealing frame 3.

[0034] The working principle of the sound absorption device for the ventilation air conditioner will be described below.

[0035] As Figures 1-4As shown, in use, the butt joint muffling pipe 2 is connected with the ventilation pipe 1 through the flange. Then, according to the ventilation volume and air speed requirement of the air conditioning system, the electric push rod 9 is adjusted, the electric push rod 9 pushes the transmission rod 10 to rotate counterclockwise around the rotating rod 11, the rotating arm 1 12 rotates, the rotating arm 1 12 drives the second resonance plate 8 to deflect clockwise. According to the muffling effect, the deflection angle of the first resonance plate 7 and the second resonance plate 8 is adjusted until the best muffling effect is achieved.

[0036] When the frequency of the sound wave matches the natural frequency of the resonance cavity, the sound wave causes strong resonance in the butt joint muffling pipe 2, so that the sound energy is converted into heat energy or other forms of energy and consumed, which can effectively reduce the noise of a specific frequency. In combination with the sound-absorbing coating 6, the sound-absorbing coating 6 can be selected from glass wool, rock wool, polyurethane foam and the like, the sound-absorbing material is installed in the metal mesh frame, and the metal mesh frame is fixed in the inner wall of the shell. The sound-absorbing material absorbs the sound wave through the pore structure inside it, converts the sound energy into heat energy, and has good muffling performance for high-frequency noise.

[0037] The muffling cavity 4 is a small chamber with a partition plate inside, and different shapes and sizes of through holes are formed in the partition plate, such as circular, square, slit and the like. When the sound wave enters the muffling cavity 4, the noise energy is reduced through the reflection and interference of the sound wave between different cavities and through holes, especially for low-frequency noise.

[0038] The resonance muffling assembly 5 has excellent noise reduction effect for low-frequency noise with a frequency of 100-500Hz. This frequency band of noise is common in the ventilation and air conditioning system, for example, the low-frequency humming sound generated by the rotation base frequency and its low-order harmonics of the fan. Taking a large centrifugal fan as an example, the rotation frequency may be about 10-50Hz, and the corresponding blade pass frequency (multiple of the base frequency) may fall within the range of 100-500Hz;

[0039] For medium-frequency noise of 500-1000Hz, the resonance muffling section also plays a role. In this frequency band, the operation noise of the air conditioner compressor may occur;

[0040] Although the resonance muffling section is not mainly for high-frequency noise, it also has certain noise reduction ability in the partial high-frequency range of 1000-2000Hz.

[0041] The above describes the utility model in detail, but some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, the modifications or improvements without departing from the spirit of the utility model are within the protection scope of the utility model.

Claims

1. A sound attenuation device for ventilation ducts, comprising a ventilation duct (1) and a counter-attenuation duct (2), characterized in that: The ventilation pipe (1) and the butt joint sound attenuation pipe (2) are detachably fixedly connected through flanges. The inner wall of the butt joint sound attenuation pipe (2) near one end is provided with a resistance sound attenuation chamber, and the inner wall of the butt joint sound attenuation pipe (2) near the other end is provided with a resonance sound attenuation assembly (5). The inner wall of the resistance sound attenuation chamber is provided with a sound attenuation cavity (4), the inner wall of the sound attenuation cavity (4) is provided with a plurality of through holes, the resonance sound attenuation assembly (5) comprises a first resonance plate (7) and a second resonance plate (8), and the resonance sound attenuation assembly (5) further comprises a power adjusting assembly for adjusting the included angle degrees of the first resonance plate (7) and the second resonance plate (8) with the inner wall of the butt joint sound attenuation pipe (2).

2. The sound attenuation device for use in a ventilation duct according to claim 1, characterized in that: The power adjusting assembly comprises an electric push rod (9) and a transmission rod (10), one end of the transmission rod (10) is fixedly connected with one end of the electric push rod (9), the top center of the first resonance plate (7) is fixedly connected with a rotating arm one (12), the top center of the second resonance plate (8) is fixedly connected with a rotating arm two (15), the bottom surfaces of the rotating arm one (12) and the rotating arm two (15) are fixedly connected with rotating rods (11), and the bottom ends of the rotating rods (11) are rotationally connected with the bottom of the inner wall of the butt joint sound attenuation pipe (2).

3. The sound attenuation device for use in a ventilation duct according to claim 1, characterized in that: The outer walls of the first resonance plate (7) and the second resonance plate (8) are provided with a plurality of resonance holes.

4. The sound attenuation device for use in a ventilation duct according to claim 2, characterized in that: One end of the transmission rod (10) is rotationally connected with one end of the rotating arm one (12), the rotating arm one (12) is rotationally connected with a transmission connecting rod (13) near one end of the transmission rod (10), one end of the transmission connecting rod (13) is rotationally connected with one end of the rotating arm two (15), one end of the rotating arm one (12) away from the transmission rod (10) is rotationally connected with an auxiliary connecting rod (14), one end of the auxiliary connecting rod (14) away from the rotating arm one (12) is rotationally connected with one end of the rotating arm two (15), and the transmission connecting rod (13) and the auxiliary connecting rod (14) are cross-distributed between the rotating arm one (12) and the rotating arm two (15).

5. The sound attenuation device for use in a ventilation duct according to claim 4, characterized in that: One side of the auxiliary connecting rod (14) is provided with a sliding groove for adapting the transmission connecting rod (13), and the inner wall of the sliding groove is slidingly connected with the outer wall of the transmission connecting rod (13).

6. The sound attenuation device for use in a ventilation system according to claim 1, characterized in that: The inner wall of the butt joint sound attenuation pipe (2) is fixedly connected with a sound-absorbing adhesive layer (6).

7. The sound attenuation device for use in a ventilation system according to claim 1, characterized in that: The outer wall of the resistance sound attenuation chamber is fixedly connected with a mounting sealing frame (3).

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