CN216691622U - Ceiling air cabinet capable of reducing low-frequency noise - Google Patents

Abstract

The utility model provides a suspended ceiling wind cabinet capable of reducing low-frequency noise, which comprises a basically closed cabinet body and is characterized in that a first glass wool sound absorption layer is additionally arranged on the inner surface of an inner cavity and is wrapped by porous cloth; the mounting rack is mounted on the bottom frame of the ceiling machine through a spring shock absorber; the ceiling machine chassis is fixedly connected with the mounting table through a fixing screw rod, and a rubber shock pad is additionally arranged at the joint of the ceiling machine chassis and the fixing screw rod. The unit is inside through increasing glass cotton, thickening polyurethane foaming board, and the unit outside increases the glass cotton + outer apron of different thickness. The optimization of the internal structure realizes the effective absorption of low-frequency sound, and the external part ensures that sound waves reduce outward transmission while absorbing sound. The effect of reducing the noise of the unit is achieved.

Description

A ceiling fan cabinet for reducing low frequency noise

technical field

The utility model relates to the field of wind cabinet equipment, in particular to a ceiling wind cabinet for reducing low-frequency noise.

Background technique

Generally, the traditional ceiling wind cabinet adopts polyurethane foam board, and the wind speed on the surface of the surface cooler is about 2.8 ~ 3.0m/S. The wind system is generally realized by the traditional belt drive to drive the fixed frequency motor. The overall structure of the unit is small in size and compact in structure design. Rubber shock-absorbing pads are used to achieve vibration reduction. Figure 1 is a schematic structural diagram of a traditional ceiling-mounted wind cabinet, which mainly includes: a surface cooler 1, a wall plate 2, a fixed-frequency motor 3, a centrifugal fan 4, a rubber shock-absorbing pad 5 and a ceiling-mounted machine chassis 6. The bottom frame 6 of the ceiling machine is an integral installation base, only the top wall is made of polyurethane foam board, and the bottom frame 6 of the ceiling machine forms the outer frame structure of the ceiling fan cabinet, the surface cooler 1, the fixed frequency motor 3, Both the centrifugal fan 4 and the rubber shock-absorbing pad 5 are arranged inside, wherein the surface cooler 1 is arranged on the left side, and on the right side is a mounting frame with a rubber shock-absorbing pad 5 at the bottom, the fixed-frequency motor 3 and the centrifugal fan 4 is fixed on the mounting bracket, and there is a ventilation opening on the right side wall. Due to the insufficient air suction spacing of the wind system and the lack of shock absorbers in the wind system, there is only rubber shock pad 5, and the unit is prone to produce "humming" low-frequency sound and airflow sound when the wind system is running without the internal noise reduction of the unit. cause discomfort to the human body. Reasons for noise: 1. The running noise generated by the operation of the fan and the motor and the low-frequency sound of the motor running; 2. The cross section of the unit causes the wind speed on the surface of the surface cooler to be too high, and the wind passes through the copper tubes and fins of the surface cooler to produce "swish swish". Swish" airflow sound; 3. The air suction process of the fan causes the collision between the airflow inside the ceiling machine and the panel to generate vibration noise; 4. The fan and motor vibrate to generate friction noise. 5. The ceiling machine transmits the vibration of the unit to the floor structure through the boom, thus generating floor vibration.

Utility model content

The technical problem to be solved by the utility model is how to effectively reduce the noise of the wind cabinet during operation.

In order to solve the above problems, the present utility model provides a ceiling fan cabinet for reducing low-frequency noise, which includes a substantially airtight cabinet body, and the cabinet body is provided with a ceiling machine chassis, a centrifugal fan, a surface cooler and a frequency conversion motor. It is arranged on one side of the inner cavity of the cabinet body, and the other side of the inner cavity is provided with a mounting frame, and the centrifugal fan and the variable frequency motor are fixed on the mounting frame. A glass wool sound-absorbing layer, the first glass wool sound-absorbing layer is wrapped with porous cloth; the wall panel of the cabinet is made of a polyurethane foam board with a thickness of 40-70 mm; the mounting frame is installed on the ceiling machine through a spring shock absorber The bottom frame of the ceiling machine is fixedly connected with the installation platform through a fixed screw, and a rubber shock-absorbing pad is installed at the connection between the bottom frame of the ceiling machine and the fixed screw.

The ceiling fan cabinet for reducing low frequency noise is characterized in that a second glass wool sound-absorbing layer and a cover plate are additionally arranged on the outer side of the wall plate of the cabinet body.

The ceiling fan cabinet for reducing low-frequency noise is characterized in that the spring shock absorber is further provided with a T-shaped reinforced support column.

The ceiling fan cabinet for reducing low-frequency noise is characterized in that one wall panel of the ceiling fan cabinet is set to be detachable.

The implementation of the utility model has the following beneficial effects: glass wool is added inside the unit, the panel is changed to a 50mm thick polyurethane foam board, and glass wool of different thicknesses + an outer cover plate are added outside the unit. The optimization of the internal structure achieves effective absorption of low-frequency sound, while the outside ensures that sound waves are reduced from outside transmission while absorbing sound. The effect of reducing the noise of the unit is achieved.

Description of drawings

Figure 1 is a schematic structural diagram of a traditional ceiling-mounted wind cabinet;

Figure 2 is a schematic structural diagram of the ceiling-mounted wind cabinet after noise reduction;

Fig. 3 is a partial enlarged connection diagram of the boom part.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Fig. 2 is a schematic structural diagram of a ceiling-mounted wind cabinet after noise reduction; Fig. 3 is a partially enlarged connection diagram of the boom portion. Mainly include: surface cooler 1, wall plate 2, fixed frequency motor 3, centrifugal fan 4, ceiling machine chassis 6, top cover plate 7; bottom cover plate 8, right cover plate 9, left cover plate 10, Two glass wool sound absorbing layers 11 , spring shock absorbers 12 , variable frequency motors 13 and a first glass wool sound absorbing layer 14 .

The centrifugal fan and the variable frequency motor are fixed on the mounting frame, and a first glass wool sound-absorbing layer 14 is added on the inner surface of the inner cavity. The impact of the internal airflow organization on the panel is based on the structural design principle of the anechoic laboratory to disperse the airflow organization and reduce the impact of the airflow on the panel, and increase the glass wool wrapped with porous cloth. Because the glass wool structure is flocculent and viscous Through the process of thermal conductivity and molecular relaxation, the regular sound motion energy is irreversibly transformed into the random geothermal motion energy, and the sound is absorbed by the glass wool to achieve the noise reduction effect. The wall panels of the cabinet are made of polyurethane foam boards with a thickness of 50 mm; the outer sides of the wall panels of the cabinet are additionally provided with a second glass wool sound-absorbing layer 11 and a cover plate. The front cover includes a top cover 7 ; a bottom cover 8 , a right cover 9 and a left cover 10 . Added multiple muffler settings to further reduce noise.

The mounting frame is installed on the bottom frame of the ceiling machine through the spring shock absorber, and the T-shaped reinforcing support column of the bottom frame is added; the original bottom frame has four fixed beams, and there is no reinforcing beam in the middle. Optimized chassis: On the basis of the existing design, a T-shaped reinforced support column is added under the fan shock pad to increase the support of the ceiling machine chassis to the bottom panel. Reduce the operating vibration of the wind system and transmit the noise through the low panel of the unit. The bottom frame of the ceiling machine is fixedly connected to the installation station through the fixed screw 16, and the rubber shock pad 15 is installed at the connection between the bottom frame of the ceiling machine and the fixed screw 16 to reduce the vibration of the unit through the screw and cause the vibration of the floor concrete layer structure.

In order to facilitate maintenance, an access door is generally provided, but there must be certain gaps between the access door and the door frame, so internal noise may be transmitted from these gaps. The utility model removes the design of the inspection door, and sets one wall panel of the ceiling fan cabinet to be detachable, thus avoiding the problem of a certain gap between the inspection door and the door frame. Make sure that internal noise and low frequency sounds are not transmitted.

Taking a 5000m3/h wind cabinet as an example, the total static pressure of the unit is within 500Pa, and the noise of the unit is allowed to be 65dB(A). According to the traditional structural design time in Figure 1, the measured noise of the unit is 62.5dB(A). The unit designed with a technical structure that eliminates low-frequency sound and reduces noise was tested in the silencing laboratory of the laboratory. Under the same equipment, the same air volume, the same pressure head, and the same motor current, the noise value of the unit can reach 48dB. (A). Noise can be reduced by 14.5 to 16.5 decibels.

What is disclosed above is only one embodiment of the present invention, of course, it cannot limit the scope of rights of the present invention. Those of ordinary skill in the art can understand that all or part of the flow of the above-mentioned embodiment can be realized, and according to the present invention The equivalent changes made by the new claims still belong to the scope covered by the utility model.

Claims (4)

1. A suspended ceiling air cabinet capable of reducing low-frequency noise comprises a basically closed cabinet body, wherein a suspended ceiling chassis, a centrifugal fan, a surface cooler and a variable frequency motor are arranged in the cabinet body, the surface cooler is arranged on one side of an inner cavity of the cabinet body, a mounting frame is arranged on the other side of the inner cavity, and the centrifugal fan and the variable frequency motor are fixed on the mounting frame; the wall plate of the cabinet body is a polyurethane foam plate with the thickness of 40-70 mm; the mounting rack is mounted on the bottom frame of the ceiling machine through a spring shock absorber; the ceiling machine chassis is fixedly connected with the mounting table through a fixing screw rod, and a rubber shock pad is additionally arranged at the joint of the ceiling machine chassis and the fixing screw rod.

2. A suspended ceiling wind cabinet capable of reducing low frequency noise according to claim 1, wherein a second glass wool sound absorbing layer and a cover plate are additionally arranged on the outer side of the wall plate of the cabinet body.

3. A suspended ceiling wind cabinet for reducing low frequency noise according to claim 1, wherein the spring damper is further provided with a T-shaped reinforcing support post.

4. A suspended ceiling wind cabinet for reducing low frequency noise according to claim 1, wherein a wall panel of the suspended ceiling wind cabinet is removably disposed.

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