CN111486133A - Damping device and low-noise fan - Google Patents

Abstract

The invention belongs to the field of machinery, and particularly relates to a damping device and a low-noise fan. The invention relates to a damping device which comprises a damping frame arranged on a base through a rubber damper, a bearing frame arranged above the damping frame through a spring damper, wherein the spring damper comprises a damping spring arranged between the damping frame and the bearing frame, a return spring which is arranged on the bearing frame and corresponds to the damping spring up and down, and a spring guide rod which vertically penetrates through the damping frame and the bearing frame correspondingly and positions the return spring and the damping spring. In the damping device provided by the invention, the spring damper mainly consumes the energy of impact sound generated by equipment, and the damping rubber device is used for cutting off a metal acoustic bridge formed by the vibration of the equipment by arranging the rubber damper between the base of the damping foundation and the damping frame, so that the noise reduction effect is improved.

Description

Shock Absorber and Low Noise Fan

technical field

The invention belongs to the field of machinery, and in particular relates to a damping device and a low-noise fan.

Background technique

In the face of the noise of the fan, despite the long-term efforts of human beings, various measures have been taken to reduce the noise of the fan, such as adding a rubber shock absorber at the bottom of the fan assembly. ZL201821962626.0 discloses an axial flow fan with a noise interference device, which is provided with an axial flow fan body and a noise interference device for reducing multi-frequency noise, and the noise interference device is assembled on the axial flow fan body. The invention achieves noise reduction of specific multi-frequency noise by adjusting the area of the two openings of the noise interference device, the overall length of the noise interference device or the shortest distance between the two openings. ZL201220247079.4 discloses a low-noise axial flow fan, including a motor, a belt, an air collector, a bearing box, an air duct and an impeller, the motor and the fan air duct are separately arranged, the belt connects the drive motor wheel and the fan wheel, and the fan wheel passes through The bearing box transmits the transmission to the impeller, the main shaft of the fan wheel, the main shaft of the bearing box and the main shaft of the impeller are at the same level, and a current collector is installed on the air inlet near the side of the fan wheel. The invention separates the motor and the fan air duct, transmits it through the belt, and sets the current collector at the air inlet to achieve the purpose of reducing noise.

However, the noise of the fan has not been completely solved. This means that no matter how different the fan models are, the common problem is that the noise improvement of the fan is not obvious. The main reason is that the low-frequency noise of the fan has not been solved well. Although different types of mufflers are configured for the fan, although the noise has been improved, the low-frequency noise of the fan has never been improved. For example, the inventor has tested the noise of a 0.8Kw axial flow fan in a research institute, and the results are shown in Table 1 below:

Table 1. Noise detection data of 0.8Kw axial fan in a research institute

Frequency (Hz) 16 31.5 63 125 250 500 1000 2000 4000 8000 16000 A-weighted 1# Axial fan 81 91.8 84 69.1 64.4 60.3 56.5 56.8 61.5 53.5 51 66.5 2# Axial flow fan 72.7 77.5 82.7 79.1 75.4 77 68.9 58.2 49.7 38.7 35.7 75.8

As can be seen from Table 1, the power of the 0.8Kw axial flow fan is not large, the A sound level reaches 66.5/75.8dB, but the low-frequency noise reaches 91.8/82.7dB at 31.5Hz/63H, respectively. By reducing the low-frequency noise, the noise emission is relatively low. If the low frequency cannot be controlled, the air sound pressure level cannot be improved.

At the same time, the inventor also detected the centrifugal fan noise of a tempered glass production line in a glass processing plant, and the results are shown in Table 2 below:

Table 2. Noise detection data of centrifugal fan in tempered glass production line of a glass processing plant

frequency Hz 16 31.5 63 125 250 500 1k 2k 4k A-weighted Fan noise dB 99.5 108.8 106.1 102.2 115.1 104.9 100.9 96.7 88.6 108.9

It can be seen from Table 2 that the noise of the centrifugal fan of the tempering furnace in the glass processing plant is relatively bad, the A sound level reaches 108.9dB, of which the low frequency 250Hz reaches 115.1dB.

To sum up, various types of fans will produce serious low-frequency noise, and how to control such high low-frequency noise is helpless.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a shock absorption device, which effectively disconnects the sound bridge connection, consumes the energy of the impact sound generated by vibration, and isolates the generation of low-frequency noise.

At the same time, the present invention also provides a low-noise fan with the damping device.

To achieve the above object, the present invention adopts the following technical solutions:

A shock absorbing device is characterized in that it comprises a shock absorbing frame arranged above a base through a rubber shock absorber, a bearing frame arranged above the shock absorbing frame through a spring shock absorber,

The spring shock absorber includes a shock-absorbing spring arranged between the shock-absorbing frame and the bearing frame, a return spring located on the bearing frame and correspondingly arranged up and down with the shock-absorbing spring, and a corresponding vertical penetrating shock-absorbing frame and a return spring. The spring guide that carries the bracket and positions the return and shock springs.

As a preferred solution, the rubber shock absorber includes a rubber shock absorbing seat, a positioning and shock absorbing rubber pad and a positioning rod. The top of the rubber shock absorbing seat is constructed with a cylindrical positioning platform to match the shock absorber embedded in the shock mount. In the connecting hole, the positioning and vibration-damping rubber pad is arranged on the upper part of the connecting hole, and the positioning rod vertically penetrates the rubber shock-absorbing seat and the center of the positioning and vibration-damping rubber pad and is fixed relative to the base and the shock-absorbing frame.

As a preferred solution, there are a plurality of the spring shock absorbers and the rubber shock absorbers, respectively.

As a preferred solution, the spring shock absorber and the rubber shock absorber are staggered up and down and are arranged in a one-to-one correspondence.

As a preferred solution, the bearing frame includes a shock-absorbing structure plate, the shock-absorbing mechanism plate includes a first sound insulation unit; a second sound insulation unit and a first damping layer, the first damping layer is provided on the between the first sound insulation unit and the second sound insulation unit.

As a preferred solution, a linear bearing is provided between the spring guide rod and the perforation of the carrier.

A low-noise fan, comprising a motor and a fan, is characterized in that the motor is fixedly arranged on the bearing frame of the shock absorbing device.

As a preferred solution, the motor and the fan are respectively fixed on the bearing frames of the two shock absorbing devices, and the two bearing frames are fixedly connected.

As a preferred solution, the fan is also provided with a muffler.

As a preferred solution, the air inlet of the fan is provided with an impedance muffler.

Compared with the prior art, the present invention has the following advantages:

(1) The spring guide rod fixes the damping spring and the return spring on the upper and lower sides of the carrier through the nuts at both ends. At the same time, by adjusting the nuts on the top of the spring guide rod, the upper and lower springs of the damping steel structure can be changed after being compressed. The change of the length of the spring makes the elastic force of the spring adapt to the consumption of the energy consumption of the impact sound of the equipment and the stroke of the best vibration damping, and another form of vibration damping through the rubber shock absorber is used to construct an overall suspension design. It is to consume the energy of the impact sound produced by the equipment, and the function of the vibration-damping rubber device is to install the rubber shock absorber between the base of the vibration-damping foundation and the shock-absorbing frame to cut off the metal sound bridge formed by the vibration of the equipment. , to increase the noise reduction effect. The cut surface of the positioning rod and the steel structure of the shock mount retain a sufficient rubber insulating layer, which is used to disconnect the sound bridge connection between the screw and the steel structure of the vibration damping base, and the rubber vibration damping seat can become the vibration damping foundation.

(2) In the present invention, a vibration-damping and sound-insulating structure is arranged at the bottom of the motor and the fan casing, so that the connection between the fan casing and the bearing frame can be completely disconnected, so that the vibration of the fan casing is effectively restrained, thereby making the Impact sound is attenuated and isolated, reducing low-frequency noise.

(3) The present invention adopts the vibration-damping and sound-insulating structure in all the structures of the motor installation base and the fan case, so as to eliminate the structural sound transmission of the fan's own structure caused by the structure generated during the operation of the motor and the fan. Through the test, the tempered glass cooling fan can improve the sound transmission of the fan at 250Hz by 18.1dB through this structure, so that the A sound level can be improved by 11.9dB, which plays an important role in improving the noise of the fan.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention. In the attached image:

1 is a schematic structural diagram of a shock absorbing device of the present invention;

Fig. 2 is the enlarged schematic diagram of the spring damper shown in A part in Fig. 1;

3 is an enlarged schematic view of the rubber shock absorber shown in part B in 1;

4 is a schematic structural diagram of a shock absorbing structural plate of the present invention;

Fig. 5 is the structural representation of the low-noise blower of the present invention;

Among them, the names of the parts in the figure are as follows:

1--base, 2--rubber shock absorber, 21--rubber shock-absorbing seat, 22--positioning shock-absorbing rubber pad, 23--positioning rod, 3--shock mount, 4--spring shock absorber , 41 - damping spring, 42 - return spring, 43 - spring guide rod, 5 - carrying frame, 51 - damping structural plate, 511 - first sound insulation unit, 512 - first Damping layer, 513 - second sound insulation unit, 6 - motor, 7 - fan, 8 - muffler.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

As shown in FIG. 1 , this embodiment provides a shock absorbing device, including a shock absorbing frame 3 arranged above the base 1 through a plurality of rubber shock absorbers 2 , and a shock absorbing frame 3 arranged on the shock absorbing frame 3 through a plurality of spring shock absorbers 4 The upper carrier frame 5 can be installed and deployed on the carrier frame 5 to generate vibration, especially low-frequency vibration devices, such as motors, fans, and the like.

Wherein, the spring shock absorber 4 includes a shock-absorbing spring 41 arranged between the shock-absorbing frame 3 and the bearing frame 5, a return spring 42 located on the bearing frame 5 and correspondingly arranged up and down with the shock-absorbing spring 41, And correspondingly, the spring guide rod 43 vertically penetrates the shock absorber frame 3 and the carrier frame 5 and positions the return spring 42 and the shock absorber spring 41 , as shown in FIG. 2 .

In order to effectively consume the impact sound energy generated by the vibration of the equipment, the vibration damping device of the present invention includes two different vibration damping modes: a spring damper and a rubber damper. The spring shock absorber is arranged between the carrier frame and the shock absorber frame. The shock absorber spring includes a shock absorber spring and a return spring, which are respectively installed under and above the carrier frame. In order to prevent the displacement of the spring, a spring is provided. Guide rod, the diameter of the spring guide rod is Ф20 optical axis, the spring guide rod is fixed on the shock mount, the fixing method is: process the diameter Ф16*35mm screw rod at the bottom end of the spring guide rod, and insert the screw rod into the shock mount In the spring guide rod installation hole of the steel structure, the bottom is positioned on the steel structure of the shock absorber through the nut, and the damping spring is passed through the spring guide rod, and the guide rod is passed through the reserved hole of the carrier frame. , set the return spring on the upper end of the spring guide rod, and thread the top of the spring guide rod, and fix the spring through the spring positioning flat washer (Ф60*6mm), the spring washer M20 and the double nut. Pressure = the sum of the upper and lower springs * the number of groups of damping springs, which is equal to less than the load of the equipment. The spring pressure can be adjusted by adjusting the installation length of the damping springs, that is, adjusting the spacing of the nuts to adjust the pre-applied force, and the entire Horizontal adjustment of the carrier frame. By adjusting the length of the spring shock absorber, the impact sound energy generated in the operation of the equipment is consumed, and the amplitude of the equipment vibration is controlled to an appropriate range.

The spring guide rod fixes the damping spring and the return spring on the upper and lower sides of the carrier through the nuts at both ends. At the same time, by adjusting the nuts on the top of the spring guide rod, the length change of the upper and lower springs of the damping steel structure after being compressed can be changed. , so that the elastic force of the spring is adapted to the consumption of the energy consumption of the impact sound of the equipment and the stroke of the best vibration reduction, and another form of vibration damping through the rubber shock absorber is used to build an overall suspension design. The energy of the generated impact sound is consumed, and the function of the vibration-damping rubber device is that the rubber shock absorber is installed between the base of the vibration-damping foundation and the shock-absorbing frame to cut off the metal sound bridge formed by the vibration of the equipment and increase the vibration reduction. noise effect.

Among them, in order to avoid friction noise or wear caused by the upward and downward movement of the spring guide rod relative to the bearing frame, the bearing frame is provided with a linear bearing matching the spring guide rod. Of course, the through hole of the shock absorber is also Linear bearings can be matched.

Embodiment 2

On the basis of the above embodiment, as a specific implementation, as shown in FIG. 3 , the rubber shock absorber 2 includes a rubber shock absorbing seat 21 , a positioning shock absorbing rubber pad 22 and a positioning rod 23 . The top of the shock-absorbing seat 21 is constructed with a cylindrical positioning platform to match and fit into the connecting hole of the shock-absorbing frame 3, the positioning and vibration-absorbing rubber pad 22 is arranged on the upper part of the connecting hole, and the positioning rod 23 vertically penetrates the The rubber shock-absorbing seat 21 and the center of the positioning shock-absorbing rubber pad 22 are fixed relative to the base 1 and the shock-absorbing frame 3, wherein, the bottom of the rubber seat is also provided with a positioning flange to be fixedly connected to the base through bolts to ensure that The location does not change.

The rubber shock absorber is made of natural rubber, and its specifications must be designed according to the load of the equipment. The hardness selection and specifications of the rubber are designed according to the load of the equipment. In order to completely disconnect the sound bridge, the rubber shock absorber includes rubber The shock-absorbing seat and the positioning shock-absorbing rubber pad, the rubber shock-absorbing seat needs to be designed as a special-shaped rubber block raised in the middle. The height of the raised part, that is, the height of the cylindrical positioning platform is the same as the thickness of the connecting hole of the steel structure. A mounting hole must be reserved in the center of the shock mount for fixing the rubber damping block, the positioning and damping rubber pad, and the metal washer on the installation foundation or the base through the positioning rod, that is, embedding the cylindrical positioning platform of the vibration damping rubber seat. In the opening of the steel structure of the shock-absorbing frame, locate the vibration-damping rubber pad on the top pad of the steel structure, and add a metal pad on the flat rubber vibration-damping pad. The specification of the metal pad is the same as that of the positioning vibration-damping rubber pad. The nut fixes the shock absorber and the base into one body, wherein the cut surface of the positioning rod and the steel structure of the shock absorber retain a sufficient rubber insulation layer, which is used to disconnect the sound bridge connection between the screw and the shock absorber basic steel structure, and the rubber reduces the vibration. Vibration mounts can be the basis for vibration reduction and can be in the shape of cubes or cylinders.

Among them, there are a plurality of the spring shock absorbers 4 and the rubber shock absorbers 2 respectively, which can be flexibly configured according to the center of gravity and the size of the load. Preferably, the spring shock absorbers 4 and the rubber shock absorbers are 2 Stagger the corresponding settings up and down one by one.

Among them, the bearing frame and the suspension frame are generally steel structures, which are made of channel steel. The connection points of the spring shock absorber and the rubber shock absorber can be correspondingly arranged on the side wall or bottom plate of the channel steel. Of course, they can also be separately To install a structure such as a hanging plate, it only needs to ensure the overall strength. For example, a reinforcing plate can be installed in the channel steel.

Moreover, in order to further improve the shock absorption effect, as shown in FIG. 4 , the bearing frame 5 includes a shock absorbing structural plate 51 , and the shock absorbing structural plate 51 includes a first sound insulating unit 511 and a second sound insulating unit 513 and a first damping layer 512, the first damping layer 512 is arranged between the first sound insulation unit 511 and the second sound insulation unit 513; wherein the first sound insulation unit is connected to the Between the first damping layers, and between the first damping layer and the second sound insulation unit due to mechanical force, are closely attached. In one embodiment, the first sound insulation unit is a steel plate with a thickness of 3 mm; the first damping layer can be made of pure natural rubber sheet or damping material such as soft polyvinyl chloride pvc or polyurethane, and its thickness needs to be the same as The overall thickness of the vibration-damping and sound-insulating structure matches, specifically, 4 mm; the second sound-insulating unit is a steel plate, which has a thickness of 2 mm; further, a third sound-insulating unit steel plate and a second damping layer may be included. The three sound insulation unit steel plates have a thickness of 3 mm; the second damping layer can be made of pure natural rubber sheet or soft PVC or polyurethane and other damping materials, and its thickness needs to be integrated with the vibration and sound insulation structure. The thickness should be matched, and the specific thickness can be 4mm. Of course, more layers of shock absorption mechanisms can be used.

The design of the added vibration and sound insulation structure can be designed according to the size of the sound transmission of the structure and the requirements that need to be controlled. The thickness of the steel plate should not be too thick, 2-5mm. 3/5mm is suitable, and the number of layers of the vibration and sound insulation structure needs to be increased to meet the requirements of structural sound transmission control. For example, a tempered glass cooling fan is 250Hz 118.5dB, and the A sound level is 108.5dB. The noise control standard in the workshop needs to meet the other requirements. The background noise of the workshop is ≤85dB, so the structure is designed with two layers of 5mm damping layer, and two layers of 3mm steel plates are added to the original fan structure to make the 250Hz reach 97dB, and the A sound level reaches 97dB. After adding the muffler, the 250Hz reaches 85.5dB and the improvement reaches 29.6dB, making the A sound level reach 87dB.

The spring composite shock absorber is used to fix the equipment and the structure to cause the structural sound transmission of the structure (to solve the low-frequency noise of the structure and widely spread the vibration noise through the building structure), but the vibration reduction of the equipment cannot control the structural sound transmission of the fan itself (the fan itself). Therefore, the present invention can be used in combination with a vibration and sound insulation structure. The vibration and sound insulation structure is a multi-layer steel plate structure. The steel plate and the steel plate are bonded together by rubber elastic materials, so that the vibration of the structure can be multi-layered. The damping of the equipment suppresses its vibration, so that the impact sound energy is attenuated layer by layer, that is, the traditional vibration reduction process cannot control the structural vibration of the equipment itself, resulting in the low frequency noise of the equipment, because the steel plate structure used by the current fan is a single layer The steel plate and the thickness of the steel plate are limited, not only the structure of the fan itself cannot control the sound transmission of its structure, but also the air sound insulation is seriously insufficient, so that the air noise and structure noise inside and outside the fan cannot be effectively controlled, although it can be . Adding a muffler to the exhaust port can only consume the air noise in the fan. However, the low-frequency noise generated by the vibration of the air noise directly transmitted through the chassis structure will not be discharged through the muffler. Therefore, the muffler cannot make the fan All noise can be reduced. For the noise of the fan, some add a sound insulation screen or a sound insulation cover for the fan. Because the noise of the fan has serious low-frequency noise, it belongs to the structural sound transmission. The structure of the fan itself can produce structural sound transmission. The structure causes the sound transmission of the sound insulation cover, especially after the addition of the sound insulation cover, the noise of the fan itself is changed from the open release noise to the noise enclosed in a limited space, forming the sound field and increasing the noise. The intensity is superimposed and the noise pollution is increased. In order to increase the air sound insulation of the structure, the inventor has done a lot of experiments. For example, compared with single glass, the laminated glass has a higher air sound insulation, but the laminated glass 8 The air sound insulation Rw of +0.76pvb+8 can reach 38dB, but increasing the thickness of the glass changes the glass structure to 10+0.76pvb+12 and keeps the thickness of pvb unchanged. Although the thickness of the glass increases by 6mm, its air sound insulation decreases. 2dB, while reaching Rw36dB. However, the thickness of the 22mm glass is retained, and the structure of the glass is changed to 8+0.76pvb+6+0.76pvb+8, the air sound insulation is increased by 13dB, and Rw=49dB. Applying this technology to the structure of the fan can effectively control the sound transmission of the structure of the fan itself, and at the same time increase the air sound insulation of the fan structure, so that the air noise of the fan can only pass through the intake and exhaust mufflers of the fan, so that Fan air noise can also be better controlled.

Embodiment 3

This embodiment discloses a low-noise fan. As shown in FIG. 5 , the low-noise fan includes a motor 6 and a fan 7, wherein the motor 6 alone or both the motor 6 and the fan 7 are fixedly arranged on the carrier 5. Of course, for Large-scale fans, motors and fans can also be installed on different bearing frames of the two shock-absorbing devices. For coupling-driven fans, when shock-absorbing devices are installed separately, the bearing frames can be fixedly connected, such as The flange is fixedly connected to ensure that the relative position of the motor and the fan does not change, and the overall structure is guaranteed to run smoothly.

The following test case proves the effect of adopting the damping device for reducing fan noise of the present invention in terms of noise control. In a test, as shown in Table 3, it can be found that all frequencies have been improved before and after the transformation, and the 250Hz low-frequency noise is particularly improved, and the noise at this frequency is reduced to 85.5dB after the transformation of 115.1dB before the transformation, an improvement of 29.6dB. The vibration reduction and sound insulation structure has not been completed, it is only the effect after the stage transformation, so it can fully demonstrate that this method is feasible to control low-frequency noise, and at the same time, due to the improvement of 250Hz noise, each frequency and its A sound level are improved. After the transformation, the sound level of the fan A reaches 87.8dB, so that the noise of the fan after the transformation reaches the workshop background noise standard.

table 3

frequency Hz 31.5 63 125 250 500 1k 2k 4k A-weighted Fan noise dB before renovation 108.8 106.1 102.2 115.1 104.9 100.9 96.7 88.6 108.9 Fan noise dB after renovation 87 86.7 91 85.5 85.4 80.7 79.8 74.5 87.8 Noise improvement dB after renovation 21.8 19.4 11.2 29.6 19.5 20.2 16.9 14.1 21.1

The process change of the vibration damping device will directly affect the working condition of the fan. It has a structure to realize the attenuation of impact sound energy. Through laboratory experiments, it can ideally suppress the structural vibration generated by the power device, and meet the needs of structural sound transmission control.

Further, on the basis of the low-noise fan, a vibration-damping and sound-insulating structure is further provided at the bottom of the fan and the motor. The shock-absorbing and sound-insulating structure is the above-mentioned shock-absorbing structural plate, and the multi-layer design will directly affect the working condition of the fan. It can effectively reduce the low-frequency noise of the fan itself caused by the structure of the fan. It has the function of attenuating the energy of the impact sound, and at the same time, it has the effect of attenuating the energy of the impact sound. The structural vibration generated by the power plant is effectively suppressed, and the need for structural sound transmission control is met.

In the prior art, since the motor base or the fan casing is directly fixed on the bracket, and the rubber shock absorber is installed under the motor installation base structure and the fan casing structure, the fan motor and the motor are installed on the base foundation. It forms an integral structure with the fan casing structure, and the vibration generated by the motor operation is not separated from the vibration of the motor by the rubber shock absorber, so that the vibration of the motor directly causes the vibration of the fan itself to generate structural sound transmission, especially the structural sound transmission. The resulting low-frequency noise not only causes low-frequency noise on the inside of the fan case, but also the sound transmission of the internal structure can consume the air noise in the fan by installing a muffler at the air inlet or exhaust end of the fan, but the vibration of the fan case also makes low-frequency noise. The noise is directly discharged into the space outside the fan through the fan's own structure, rather than propagating the noise through the pipeline. The noise of the fan is controlled by the vibration of the muffler, which causes the fan to vibrate the structure of the fan itself to form structural sound transmission, thereby generating low-frequency noise. Although a rubber shock absorber is installed under the base structure of the original fan, this set of shock absorbers can only isolate the vibration of the base structure of the fan and the ground steel-concrete structure, but it cannot isolate the vibration of the shock absorber, including the motor installation structure. With the vibration of the fan casing structure, the fan's own structure is not disconnected from the vibration of the motor through the rubber vibration isolator, resulting in the fan by increasing the vibration isolation. The sound insulation structure is fixed with the bearing frame, so that the connection between the motor or fan and the bearing frame can be completely disconnected, so that the vibration is strongly restrained, and the impact sound is attenuated and isolated, thereby reducing the low frequency. noise generation.

The difference from the traditional fan noise reduction is that in order to control the noise of the fan and transmit noise through the air inlet, a muffler 8 should be installed at the air inlet of the fan. In order to increase the control of low-frequency noise, the muffler needs to use an impedance muffler. The sound structure has the design of impact sound insulation to prevent the muffler from causing new structural sound transmission through wind noise and its structure. For steel plate, structural adhesive, cement pressure plate, structural adhesive and steel plate, such as steel plate 3mm + structural adhesive 5mm + 12mm cement pressure plate + 5mm structural adhesive + 3mm steel plate, when the air inlet of the fan is added with an air inlet muffler, the noise of the air inlet will be reduced from 105dB The reduction reaches 85dB.

The structure of the fan itself can transmit low-frequency noise and its wind noise. The fan can make the noise of the fan meet the required noise control standard by adopting the vibration-damping and sound-insulating structure and impedance muffler. To increase the noise control requirements, the vibration-absorbing steel plate can be added. and the number of damping layers, while the standard fan vibration and sound insulation structure that reaches Rw87dB adopts 3 layers of steel plates and 2 layers of damping layers.

Experiments show that the present invention has changed the traditional concept of equipment noise control, so that the low-frequency noise of the fan itself due to structural sound transmission has been significantly improved. The sound room encloses the noise of the equipment in the hood or room, but since the noise of the equipment is low-frequency noise exceeding 100dB, the structure of the equipment is radiated by the air sound pressure level to the structure, especially the air whose sound pressure level exceeds the structure. The amount of sound insulation, the structure itself will cause vibration to produce structural sound transmission, resulting in low-frequency noise of the equipment. In this state, the equipment structure can generate structural sound transmission, and at the same time, it can also cause structural sound transmission of the sound insulation structure. A new sound field is generated in the sound cover, causing the reverberation of equipment noise and further aggravating noise pollution. The impact will cause the structural sound transmission of the building structure. Since the addition of the sound insulation cover will cause the noise in the sound insulation cover to reverberate, which will increase its noise pollution, and the structural sound transmission caused by equipment vibration will also cause the sound insulation cover body. The sound transmission of the structure will increase the noise pollution of the equipment. The shock absorber used in general engineering cases is a socially purchased rubber shock absorber. The impact of the rubber material by the instantaneous impact sound energy is not like a spring that can be instantly compressed so that the impact sound energy can be released in time. Although the multi-layer composite sound insulation structure has good restraint and suppression on the impact sound formed by itself, it is obviously insufficient for the release of the instantaneously generated impact sound energy. Both have different advantages and can be used under different conditions. Make the most of its own advantages. The concept of controlling the sound transmission of a structure has been verified through engineering practice, and it has also laid a foundation for the design concept of low-noise equipment.

Finally, it should be noted that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the The technical solutions described in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A shock absorbing device, characterized in that it comprises a shock absorbing frame (3) arranged above the base (1) through a rubber shock absorber (2), and is arranged on the shock absorbing frame (4) through a spring shock absorber (4). 3) the carrier frame (5) above, The spring shock absorber (4) includes a shock-absorbing spring (41) arranged between the shock-absorbing frame (3) and the bearing frame (5), which is located on the bearing frame (5) and is connected with the shock-absorbing spring (41). ) A return spring (42) correspondingly arranged up and down, and a corresponding spring guide rod ( 43). 2 . The shock absorbing device according to claim 1 , wherein the rubber shock absorber ( 2 ) comprises a rubber shock absorbing seat ( 21 ), a positioning shock absorbing rubber pad ( 22 ) and a positioning rod ( 23 ). 3 . The top of the rubber shock-absorbing seat (21) is constructed with a cylindrical positioning table to match and fit into the connecting hole of the shock-absorbing frame (3), and the positioning and vibration-absorbing rubber pad (22) is arranged on the upper part of the connecting hole, so The positioning rod (23) vertically penetrates the rubber shock-absorbing seat (21) and the center of the positioning and shock-absorbing rubber pad (22) and is fixed relative to the base (1) and the shock-absorbing frame (3). 3. The shock absorbing device according to claim 2, characterized in that there are multiple spring shock absorbers (4) and rubber shock absorbers (2). 4 . The shock absorbing device according to claim 3 , wherein the spring shock absorber ( 4 ) and the rubber shock absorber ( 2 ) are staggered up and down and arranged in a one-to-one correspondence. 5 . 5. The shock absorbing device according to claim 1, wherein the bearing frame (5) comprises a shock absorbing structural plate (51), and the shock absorbing structural board comprises a first sound insulation unit (511) , a second sound insulation unit (513) and a first damping layer (512), the first damping layer (512) is arranged on the first sound insulation unit (511) and the second sound insulation unit (513) between. 6 . The shock absorbing device according to claim 1 , wherein a linear bearing is arranged between the spring guide rod ( 43 ) and the through hole of the carrier frame ( 5 ). 7 . 7. A low-noise fan, comprising a motor (6) and a fan (7), wherein the motor (6) is fixedly arranged on the bearing of the shock absorbing device according to any one of claims 1-5 on the shelf (5). 8 . The low-noise fan according to claim 7 , wherein the motor ( 6 ) and the fan ( 7 ) are respectively fixed on the bearing frames of the two shock absorbing devices, and the two bearing frames are fixedly connected. 9 . 9. The low-noise fan according to claim 7, characterized in that, the fan is further provided with a muffler (8). 10 . The low-noise fan according to claim 9 , wherein an impedance muffler is provided at the air inlet of the fan. 11 .

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