Noise reduction device for roof unit

Abstract

The utility model discloses a noise reduction device for a roof unit, and relates to the technical field of roof units, the noise reduction device comprises fan shell noise elimination plates, a noise elimination cover and a rain cover, the fan shell noise elimination plates are installed on the periphery of the unit, and the fan shell noise elimination plates are fixed; an integral silencing cover is mounted at an air outlet of the unit, silencing flow guide columns are arranged in the silencing cover, and an anti-vortex flow guide plate is arranged at the top of the silencing cover, so that airflow can be discharged smoothly; rainproof covers are installed on the two sides of an outlet of the silencing cover, after installation, the unit can reduce noise generated in the gas conveying process to a certain degree, the use requirement for noise reduction under the working conditions of large air volume and high rotating speed is met, and the applicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rooftop units, in particular to a noise reduction device for rooftop units. Background Art

[0002] Existing vertical rooftop units are generally used in various types of industrial plants, warehouses, buildings, etc., which are mechanically supplied and exhausted by concrete or steel frame roofs. However, some areas of vertical rooftop units arranged outdoors are adjacent to commercial or residential areas, which are more sensitive to the noise generated by the operation of the units. Existing vertical units generally do not take noise reduction measures. When the unit motor drives the impeller to run, the casing will produce slight vibrations, and the casing will transmit the noise of the motor and impeller when they are running. In addition, the unit is installed vertically, and only a rain cap is set at the outlet to prevent rain; when the outlet airflow continuously hits the inner wall of the hood, it will cause the fan vibration to increase and the outlet noise to increase, resulting in an impact on the surrounding environment.

[0003] Some companies use frequency conversion to reduce the speed to reduce noise, which is only suitable for high-speed motors, but the overall air volume will be reduced after frequency conversion. If the project requires high air volume and low speed, frequency conversion is no longer applicable. Therefore, it is necessary to design a noise reduction device at the outlet to reduce the noise value to solve the above problems in the existing technology. Utility Model Content

[0004] The purpose of the utility model is to provide a noise reduction device for a rooftop unit to solve the problems existing in the above-mentioned prior art, to reduce noise, to meet the noise reduction requirements under the operating conditions of the unit, and to improve applicability.

[0005] To achieve the above purpose, the utility model provides the following solution: The utility model provides a noise reduction device for a rooftop unit, comprising:

[0006] The fan casing silencer plate is arranged on the periphery of the unit.

[0007] A muffler cover, the air outlet of the unit is equipped with the muffler cover, a plurality of muffler guide columns are arranged inside the muffler cover along the airflow direction, and an anti-vortex guide plate is arranged on the top of the muffler cover;

[0008] A rain cover is provided on the outer circumferential edge of the air outlet of the unit.

[0009] Preferably, the bottom of the fan housing silencer plate is fixed to the fan base with bolts.

[0010] Preferably, the fan housing muffler plate comprises an outer plate, an inner plate and an intermediate layer, the outer plate is a 2 mm thick galvanized plate, the inner plate is a 1 mm thick galvanized perforated plate, the intermediate layer is centrifugal glass wool, and the bulk density of the centrifugal glass wool is 48 kg / m 3 .

[0011] Preferably, a plurality of the noise-reducing guide columns are evenly arranged inside the noise-reducing hood, and the noise-reducing guide columns are fixed to the internal frame of the noise-reducing hood by bolts.

[0012] Preferably, the cylindrical sound-absorbing guide column is made of a 0.8 mm thick galvanized perforated plate, and the inner wall of the sound-absorbing guide column is provided with an intermediate layer, which is centrifugal glass wool, and the bulk density of the centrifugal glass wool is 48 kg / m 3 .

[0013] Preferably, the anti-vortex guide plate is mounted on the top of the air outlet of the unit, and the bottom surface of the anti-vortex guide plate is an arc-shaped surface that bulges in the middle and smoothly transitions to the surrounding areas; the circumference of the anti-vortex guide plate is close to the edge of the air outlet of the unit, and a gap is left between the circumference of the anti-vortex guide plate and the edge of the air outlet of the unit.

[0014] Preferably, the anti-eddy current guide plate is made of 1 mm thick galvanized sheet.

[0015] Preferably, the rain cover is made of 2 mm thick galvanized sheet.

[0016] Compared with the prior art, the utility model has achieved the following beneficial technical effects:

[0017] The noise reduction device for a rooftop unit in the utility model comprises a fan casing silencer plate, a silencer cover and a rain cover, wherein the fan casing silencer plate is installed around the unit and fixed; an integral silencer cover is installed at the air outlet of the unit, a silencer guide column is arranged inside the silencer cover, and an anti-vortex guide plate is arranged on the top to facilitate the smooth discharge of airflow; rain covers are installed on both sides of the outlet of the silencer cover, and after installation, the unit can achieve a certain reduction in the noise generated during gas transportation, meet the use requirements of noise reduction under high air volume and high speed conditions, and improve applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1This is the overall structural distribution diagram of the noise reduction device for the rooftop unit;

[0020] Among them, 1. Fan casing silencer plate; 2. Silencer guide column; 3. Anti-vortex guide plate; 4. Rain cover. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The purpose of the utility model is to provide a noise reduction device for a rooftop unit to solve the problems existing in the above-mentioned prior art, to reduce noise, to meet the noise reduction requirements under the operating conditions of the unit, and to improve applicability.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] like Figure 1 As shown, the utility model provides a noise reduction device for a rooftop unit, comprising:

[0025] The fan casing silencer plate 1 is provided on the periphery of the unit.

[0026] A muffler cover is installed at the air outlet of the unit, and a plurality of muffler guide columns 2 are arranged inside the muffler cover along the airflow direction, and an anti-vortex guide plate 3 is arranged on the top of the muffler cover;

[0027] A rain cover 4 is provided on the outer peripheral edge of the air outlet of the unit.

[0028] In one of the embodiments, the bottom of the fan housing muffler plate 1 is fixed to the fan base by bolts.

[0029] In one embodiment, the fan housing muffler plate 1 includes an outer plate, an inner plate and an intermediate layer, the outer plate is a 2 mm thick galvanized plate, the inner plate is a 1 mm thick galvanized perforated plate, and the intermediate layer is centrifugal glass wool, the bulk density of the centrifugal glass wool is 48 kg / m 3 The function of the fan housing muffler plate 1 is to prevent the noise from the impeller and motor from being transmitted when the unit is running.

[0030] In one of the embodiments, a plurality of sound-absorbing guide columns 2 are evenly arranged inside the sound-absorbing hood, and the sound-absorbing guide columns 2 are fixed to the internal frame of the sound-absorbing hood by bolts.

[0031] In one embodiment, the cylindrical muffler guide column 2 is made of a 0.8 mm thick galvanized perforated plate, and the inner wall of the muffler guide column 2 is provided with an intermediate layer, which is centrifugal glass wool, and the bulk density of the centrifugal glass wool is 48 kg / m 3 The function of the muffler guide column 2 is to guide the outlet airflow of the unit and reduce the outlet noise.

[0032] In one embodiment, the anti-vortex deflector 3 is mounted on the top of the air outlet of the unit, and the bottom surface of the anti-vortex deflector 3 is an arc-shaped surface that is convex in the middle and smoothly transitions to the surroundings; the circumference of the anti-vortex deflector 3 is close to the edge of the air outlet of the unit, and a gap is left between the circumference of the anti-vortex deflector 3 and the edge of the air outlet of the unit. The function of the anti-vortex deflector 3 is to reduce the impact of the airflow on the top plate of the unit and make the change of the airflow direction more gentle.

[0033] In one of the embodiments, the anti-vortex guide plate 3 is made of 1 mm thick galvanized sheet.

[0034] In one of the embodiments, the rain cover 4 is made of 2 mm thick galvanized sheet; the function of the rain cover 4 is to prevent rainwater from flowing back into the interior of the unit.

[0035] The installation method of the noise reduction device for rooftop units is as follows:

[0036] The fan casing silencer plate 1 is installed around the unit and fixed to the fan base with bolts, the silencer cover is installed to the top of the air outlet of the unit, the silencer guide column 2 is vertically installed inside the silencer cover and fixed to the internal frame of the silencer cover with bolts; the anti-vortex guide plate 3 is installed on the top of the silencer cover, and the airflow can flow in the direction after passing through, reducing the impact of the airflow on the top plate and making the change of the airflow direction smoother; a rain cover 4 is set at the outlet of the silencer cover to prevent rainwater from entering the unit.

[0037] The noise reduction device for rooftop units in the utility model is compared with the original vertical fan, the original vertical fan casing has no noise reduction measures, the outlet only meets the rain protection with a rain cap, and is installed at the outlet, which makes the airflow run unsmooth and the outlet noise increases. After improvement in the utility model, the shell of the unit is silenced at the outlet, and measures such as airflow diversion and rain protection are considered, so that the outlet noise is reduced.

[0038] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0039] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A noise reduction device for a rooftop unit, characterized in that: include: The fan casing silencer plate is arranged on the periphery of the unit. A muffler cover, the air outlet of the unit is equipped with the muffler cover, a plurality of muffler guide columns are arranged inside the muffler cover along the airflow direction, and an anti-vortex guide plate is arranged on the top of the muffler cover; A rain cover is provided on the outer circumferential edge of the air outlet of the unit.

2. The noise reduction device for a rooftop unit according to claim 1, characterized in that: The bottom of the fan housing silencer plate is fixed to the fan base by bolts.

3. The noise reduction device for a rooftop unit according to claim 1, characterized in that: The fan housing muffler plate includes an outer plate, an inner plate and an intermediate layer. The outer plate is a 2mm thick galvanized plate, the inner plate is a 1mm thick galvanized perforated plate, and the intermediate layer is centrifugal glass wool. The bulk density of the centrifugal glass wool is 48kg / m 3 .

4. The noise reduction device for a rooftop unit according to claim 1, characterized in that: A plurality of the noise-reducing guide columns are evenly arranged inside the noise-reducing cover, and the noise-reducing guide columns are fixed to the internal frame of the noise-reducing cover by bolts.

5. The noise reduction device for a rooftop unit according to claim 1, characterized in that: The cylindrical muffler guide column is made of 0.8 mm thick galvanized perforated plate. The inner wall of the muffler guide column is provided with an intermediate layer, which is centrifugal glass wool. The bulk density of the centrifugal glass wool is 48 kg / m 3 .

6. The noise reduction device for a rooftop unit according to claim 1, characterized in that: The anti-vortex guide plate is mounted on the top of the air outlet of the unit, and the bottom surface of the anti-vortex guide plate is an arc-shaped surface that bulges in the middle and smoothly transitions to the surrounding areas; the circumference of the anti-vortex guide plate is close to the edge of the air outlet of the unit, and a gap is left between the circumference of the anti-vortex guide plate and the edge of the air outlet of the unit.

7. The noise reduction device for a rooftop unit according to claim 1, characterized in that: The anti-eddy current guide plate is made of 1 mm thick galvanized sheet.

8. The noise reduction device for a rooftop unit according to claim 1, characterized in that: The rain cover is made of 2mm thick galvanized sheet.

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