Intake and exhaust silencer for high-speed fan

Abstract

The utility model provides an intake and exhaust silencer for a high-speed fan. The intake and exhaust silencer comprises an outer steel plate, four sides of the outer steel plate are encircled and spliced into a rectangular square tube, a fixed shutter is mounted at an air inlet end of the rectangular square tube, a movable shutter is mounted at an air outlet end of the rectangular square tube, and a plurality of inclined sound insulation plates are fixed in the rectangular square tube in parallel; and on the projection of the end part of the rectangular square tube, the sound insulation plate completely covers the inner cavity space of the rectangular square tube. The structure that the inclined sound insulation plates are fixed side by side is adopted, the airflow shearing capacity is greatly reduced and the multi-stage noise reduction effect is achieved based on the flow guiding and bending effects of the sound insulation plates in a very small space, and therefore the noise reduction effect of a small-size silencer is greatly improved, and structural redundancy is effectively avoided; the noise reduction device is especially suitable for industrial production scenes with limited volume and high requirements on noise reduction effect.

Description

Technical Field

[0001] This utility model relates to a high-speed fan intake and exhaust silencer, belonging to the technical field of high-speed fan accessories. Background Technology

[0002] High-speed fans generate aerodynamic noise during operation. The internal noise can generally be solved by replacing the outer shell with a sound-absorbing shell (filled with materials such as sponge). However, the noise from the intake and exhaust jets cannot generally be silenced by directly modifying the structure of the high-speed fan. The basic principle of this noise is that the high-speed exhaust and the shearing of the still air generate a high-frequency whistling sound of 2-8kHz. Therefore, it is necessary to install silencers at the intake and exhaust ports.

[0003] Existing intake and exhaust mufflers generally consist of a simple external, relatively enclosed cavity. Examples include the integrated exhaust muffler cavity and refrigeration compressor disclosed in Chinese Patent Application No. CN201621192806.6, and a twin-screw blower exhaust muffler with a heat insulation layer disclosed in Chinese Patent Application No. CN201821413450.3. While this simple enclosed structure can reduce noise to some extent, it falls far short of the desired silencing effect, at most reducing noise levels above 100 decibels by 40 decibels. Therefore, to achieve better silencing in practice, the same muffler must be installed in multiple stages to achieve multi-stage noise reduction, resulting in an extremely large and redundant structure. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a high-speed fan intake and exhaust silencer. The high-speed fan intake and exhaust silencer adopts a structure of multiple inclined sound insulation plates fixed in parallel. In a very small space, the airflow shearing capacity is greatly reduced by the air insulation plate's guiding and bending effect, and a multi-stage noise reduction effect is achieved. This greatly improves the noise reduction effect of the small-volume silencer and effectively avoids structural redundancy.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a high-speed fan intake and exhaust silencer, including an outer steel plate; the outer steel plate is assembled into a rectangular tube on all four sides, a fixed louver is installed at the air intake end of the rectangular tube and a movable louver is installed at the air outlet end, and multiple inclined sound insulation panels are fixed in parallel inside the rectangular tube; on the projection of the end of the rectangular tube, the sound insulation panels completely cover the inner cavity space of the rectangular tube.

[0007] The inclination angle of the sound insulation board relative to the end face of the rectangular square tube is no greater than 50°.

[0008] The sound insulation panel consists of three parallel fixed pieces.

[0009] The tilt direction of the sound insulation panel is symmetrical to the tilt direction of the fixed louver blades.

[0010] The tilt direction of the sound insulation panel is the same as the tilt direction of the movable louver blades.

[0011] The sound insulation board has a perforated mesh frame and is filled with rock wool.

[0012] Each of the outer steel plates is a hollow structure, filled with rock wool.

[0013] The sound insulation panel is fixed to the outer steel plate by welding on both sides.

[0014] The included angle between the sound insulation panel and the fixed louver blades is 40° to 130°.

[0015] The beneficial effects of this utility model are as follows: by adopting a structure of multiple inclined sound insulation panels fixed in parallel, the airflow shearing capacity is greatly reduced and multi-stage noise reduction is achieved in a very small space based on the airflow guiding and bending effect of the sound insulation panels, thereby greatly improving the noise reduction effect of small volume silencers and effectively avoiding structural redundancy; it is especially suitable for industrial production scenarios where volume is limited and high requirements for noise reduction effect are required. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of at least one embodiment of the present invention;

[0017] Figure 2 yes Figure 1 Sectional view of plane AA;

[0018] Figure 3 yes Figure 1 BB section view.

[0019] In the diagram: 11-Fixed louvers, 12-Modible louvers, 13-Outer steel plate, 14-Outer rock wool, 21-Sound insulation board, 22-Perforated mesh plate, 23-Inner rock wool. Detailed Implementation

[0020] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0021] The first embodiment of the present invention relates to, for example Figures 1 to 3 The high-speed fan intake and exhaust silencer shown includes an outer steel plate 13; the outer steel plate 13 is assembled into a rectangular tube on all four sides, and a fixed louver 11 is installed at the air intake end of the rectangular tube and a movable louver 12 is installed at the air outlet end. Multiple inclined sound insulation panels 21 are fixed in parallel inside the rectangular tube; on the projection of the end of the rectangular tube, the sound insulation panels 21 completely cover the inner cavity space of the rectangular tube.

[0022] Therefore, the fixed louver 11 is used to adjust the air intake direction and prevent rainwater and debris from entering, the movable louver 12 is used to adjust the airflow intensity, and the sound insulation panel 21 is used to greatly increase the airflow bending. Part of the airflow is guided and bent through the sound insulation panel 21, and another part of the airflow passes through the sound insulation panel 21 to reduce speed, thereby achieving noise reduction.

[0023] The second embodiment of the present invention is largely the same as the first embodiment, except that the inclination angle of the sound insulation plate 21 relative to the end face of the rectangular square tube is no greater than 50°.

[0024] Furthermore, the tilt direction of the sound insulation panel 21 is symmetrical to the tilt direction of the blades of the fixed louver 11. This causes the airflow to be guided and bent by the sound insulation panel 21 as it enters from the fixed louver 11, thereby maximizing the noise reduction efficiency.

[0025] Furthermore, the tilt direction of the sound insulation panel 21 is consistent with the tilt direction of the blades of the movable louver 12. The airflow has already achieved noise reduction after being guided by the sound insulation panel 21, so the consistent tilt direction of the sound insulation panel 21 and the blades of the movable louver 12 can ensure smooth airflow.

[0026] Furthermore, the included angle between the sound insulation panel 21 and the blades of the fixed louver 11 is 40° to 130°. Actual testing showed that this angle range yielded the best results; angles less than 40° or greater than 130° easily resulted in a significant reduction in sound absorption, the underlying principle of which is not yet clear.

[0027] The third embodiment of the present invention is largely the same as the first embodiment, except that the sound insulation board 21 is fixed in three parallel pieces.

[0028] Furthermore, the sound insulation panel 21 has a perforated mesh panel 22 forming an outer frame, which is filled with inner rock wool 23.

[0029] Furthermore, each of the outer steel plates 13 is a hollow structure, filled with outer rock wool 14.

[0030] Furthermore, the sound insulation panel 21 is fixed to the outer steel plate 13 by welding on both sides.

[0031] This embodiment mainly optimizes specific details. It is easy to understand that a fully rigid structure is obviously not conducive to noise reduction. Therefore, both the sound insulation panel 21 and the outer steel plate 13 adopt a structure filled with rock wool, while the outer frame of the sound insulation panel 21 adopts a perforated mesh plate 22, which is conducive to airflow. This allows some high-speed airflow to pass through the three sound insulation panels 21 to achieve noise reduction, while the other part of low-speed airflow achieves noise reduction based on the bending effect of the sound insulation panel 21.

Claims

1. A high-speed fan intake and exhaust silencer, comprising an outer steel plate (13), characterized in that: The outer steel plate (13) is assembled into a rectangular tube on all four sides. The air inlet end of the rectangular tube is fitted with a fixed louver (11), and the air outlet end is fitted with a movable louver (12). Several inclined sound insulation plates (21) are fixed in parallel inside the rectangular tube. On the projection of the end of the rectangular tube, the sound insulation plate (21) completely covers the inner cavity space of the rectangular tube.

2. The high-speed fan intake and exhaust silencer as described in claim 1, characterized in that: The inclination angle of the sound insulation board (21) relative to the end face of the rectangular square tube is no greater than 50°.

3. The high-speed fan intake and exhaust silencer as described in claim 1, characterized in that: The sound insulation panel (21) consists of three parallel fixed panels.

4. The high-speed fan intake and exhaust silencer as described in claim 1, characterized in that: The tilt direction of the sound insulation panel (21) is symmetrical to the tilt direction of the blades of the fixed louver (11).

5. The high-speed fan intake and exhaust silencer as described in claim 1, characterized in that: The tilt direction of the sound insulation panel (21) is consistent with the tilt direction of the blades of the movable louver (12).

6. The high-speed fan intake and exhaust silencer as described in claim 1, characterized in that: The sound insulation board (21) is a perforated mesh board (22) forming an outer frame, and is filled with inner rock wool (23).

7. The high-speed fan intake and exhaust silencer as described in claim 1, characterized in that: Each of the outer steel plates (13) is a hollow structure, and its interior is filled with outer rock wool (14).

8. The high-speed fan intake and exhaust silencer as described in claim 1, characterized in that: The sound insulation panel (21) is fixed to the outer steel plate (13) by welding on both sides.

9. The high-speed fan intake and exhaust silencer as described in claim 1, characterized in that: The included angle between the sound insulation panel (21) and the blades of the fixed louver (11) is 40° to 130°.

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