Fan silencing equipment convenient to install for civil ship

Abstract

The utility model discloses a civil ship fan silencing device convenient to install, which comprises a top cover and a threaded connecting piece, the top cover is in the shape of a mushroom head, the threaded connecting piece installs the top cover on a flange of a fan shell, an elastic silencing piece is installed on the inner top wall of the top cover, the elastic silencing piece is in the shape of a bowl, and the elastic silencing piece is connected with the threaded connecting piece. And a closed buffer space is formed between the elastic silencing piece and the inner top wall of the top cover. The elastic silencing piece is equivalent to a pressure buffer, gas pressure change is eliminated, gas stably enters the fan shell, and noise generated in the running process of the fan is eliminated. The elastic silencing piece, the top cover and the fan shell are fixedly connected through the same set of threaded connecting piece, and installation is convenient.

Description

Technical Field

[0001] This utility model relates to ventilation equipment, specifically to ventilation equipment for civilian ships. Background Technology

[0002] Axial flow fans are widely used in ventilation systems for cabins with large air volumes, such as engine rooms, due to their large air volume and ease of installation and maintenance. Compared to centrifugal fans, axial flow fans are noisier. To effectively reduce ventilation system noise, given a selected fan speed, silencers are typically installed on the ductwork to reduce the propagation of axial flow fan noise and achieve noise reduction.

[0003] However, space is limited on ships and offshore platforms, and pipe silencers require a certain flow length to achieve noise reduction, which takes up a lot of space and is difficult to install.

[0004] Patent document CN 212055176 U discloses a combined marine silencing fan system, in which an axial flow fan is housed within a silencing box with an open bottom. The silencing box includes a top plate and side plates; a vertical ventilation channel is formed between the side plates and the fan housing; a horizontal ventilation channel is formed between the top plate and the top surface of the axial flow fan. The bottom end of the fan housing is connected to a silencing damper duct. The silencing box and silencing damper duct effectively reduce the noise generated by the axial flow fan.

[0005] The combined marine silencing fan system in the aforementioned patent document has the fan casing and the silencing air damper duct stacked on top of each other, giving the entire fan system a high height. Utility Model Content

[0006] The technical problem solved by this utility model is that in the existing combined marine silencing fan system, the fan shell and the silencing air damper are stacked on top of each other, which makes the entire fan system quite tall and may not be suitable for the narrow space of ships and offshore platforms.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a fan silencing device that is easy to install on civilian ships, including a top cover and a threaded connector. The top cover is mushroom-shaped and has a first connection hole. The threaded connector fits into the first connection hole and installs the top cover on the flange of the fan housing. The outer diameter of the top cover is larger than the outer diameter of the fan housing. There is an axial gap between the top cover and the air inlet end of the fan housing. An elastic silencing component is installed on the inner top wall of the top cover. The elastic silencing component is bowl-shaped, and a sealed buffer space is formed between the elastic silencing component and the inner top wall of the top cover.

[0008] According to the above technical solution, the bottom end of the fan casing, i.e., the exhaust end, is installed on the flange of the ship's air duct. The fan blades inside the fan casing rotate, and external gas enters the fan casing through the gap between the top cover and the inlet end of the fan casing, and then enters the ship's air duct through the exhaust end. Before the external gas enters the gap between the top cover and the inlet end of the fan casing but before entering the fan casing, the gas is compressed and then released due to changes in the cross-sectional area of ​​the airflow channel, which may generate noise. The elastic silencer of this invention withstands the gas pressure, contracting when the gas pressure increases, thus reducing the buffer space; and expanding when the gas pressure decreases, thus increasing the buffer space. In this way, the elastic silencer acts as a pressure damper, eliminating gas pressure changes and allowing gas to enter the fan casing stably, thereby eliminating the noise generated during fan operation.

[0009] The edge of the flexible silencer component has a second connecting hole, and the flange of the fan housing has a third connecting hole. A threaded connector connects the first, second, and third connecting holes simultaneously, linking the top cover, flexible silencer component, and fan housing together. This eliminates the need for additional connecting holes for the flexible silencer component on the top cover, improving its waterproof and dustproof performance. Furthermore, it facilitates the installation of the fan silencer and the fan housing.

[0010] The threaded connector comes with a first nut, a second nut, and a third nut. The head of the threaded connector clamps the top cover and the elastic silencer with the first nut, while the second and third nuts clamp onto the flange of the fan housing. Loosening the second and third nuts allows adjustment of the relative height of the top cover to the fan housing to accommodate the confined spaces on ships and offshore platforms.

[0011] The top of the top cover has a convex structure on its outer top and a concave structure on its inner top. The convex and concave structures are arranged correspondingly, and the concave structure of the elastic sound-absorbing component is opposite to the concave structure. The corresponding convex and concave structures help to expand the buffer space, improve the range of elastic change of the elastic sound-absorbing component, and also improve the drainage and sewage discharge performance of the top cover.

[0012] The inner wall of the top cover is lined with a sound-absorbing perforated plate, and a layer of sound-absorbing material is filled between the inner wall of the top cover and the sound-absorbing perforated plate. Alternatively, the sound-absorbing perforated plate is made of stainless steel SS316, and the sound-absorbing material layer is made of fine glass wool.

[0013] A motor bracket is welded to the air inlet end of the fan casing, and a motor is mounted on the bracket. The motor shaft is connected to the fan blades. A filter screen is installed at the air inlet end, and the filter screen is mounted on the inner flange of the fan casing. The motor shaft passes through the filter screen and is connected to the fan blades. Alternatively, an electrical control switch is located on the outer top of the top cover or on the outer side wall of the fan casing, and the electrical control switch is connected to the motor via a wire.

[0014] The wind turbine silencing device of this utility model, which is easy to install on civilian ships, has the following technical effects:

[0015] First, the elastic silencer acts as a pressure damper, eliminating gas pressure changes and allowing gas to enter the fan casing stably, thereby eliminating the noise generated during fan operation.

[0016] Secondly, the flexible sound-absorbing component is fixedly connected to the top cover and the fan housing through the same set of threaded connectors, making installation convenient;

[0017] Third, the height of the wind turbine silencing equipment relative to the wind turbine casing is adjustable to accommodate the confined spaces on ships and offshore platforms. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1 A cross-sectional view of a fan silencing device that is easy to install on civilian ships;

[0020] Figure 2 Exploded view of a fan silencing device that is easy to install on civilian ships;

[0021] Figure 3 for Figure 2 A schematic diagram from another perspective of wind turbine silencing equipment that is easy to install on Chinese civilian ships;

[0022] Figure 4 A schematic diagram of a fan noise reduction device installed on a civilian ship for easy installation.

[0023] Figure 5 for Figure 4 The main view;

[0024] Figure 6 for Figure 4 A diagram from another perspective;

[0025] Figure 7 for Figure 4 Exploded view;

[0026] Figure 8 for Figure 5 A sectional view.

[0027] Explanation of symbols in the diagram:

[0028] 10. Top cover; 11. First connecting hole; 12. Upward protruding structure;

[0029] 20. Threaded connector; 21. First nut; 22. Second nut; 23. Third nut;

[0030] 30. Fan casing; 31. Flange; 33. Motor bracket; 34. Motor; 35. Fan blades; 36. Filter screen; 37. Inner flange;

[0031] 40. Elastic sound-absorbing component; 41. Buffer space; 42. Second connection hole. Detailed Implementation

[0032] Combination Figure 1 , Figure 2 , Figure 7 A fan silencing device for easy installation on civilian ships includes a top cover 10 and a threaded connector 20. The top cover is mushroom-shaped and has a first connection hole 11. The threaded connector fits into the first connection hole and installs the top cover on the flange of the fan housing 30. The outer diameter of the top cover is larger than the outer diameter of the fan housing. There is an axial gap between the top cover and the air inlet end of the fan housing. An elastic silencing element 40 is installed on the inner top wall of the top cover. The elastic silencing element is bowl-shaped and forms a sealed buffer space 41 between the elastic silencing element and the inner top wall of the top cover.

[0033] like Figure 2 The edge of the elastic silencing component 40 is provided with a second connection hole 42, and the flange 31 of the fan housing is provided with a third connection hole. The threaded connector 20 connects the first connection hole, the second connection hole and the third connection hole at the same time, connecting the top cover 10, the elastic silencing component and the fan housing 30 together.

[0034] like Figure 7 The threaded connector 20 is equipped with a first nut 21, a second nut 22 and a third nut 23. The head of the threaded connector is clamped with the first nut to the top cover 10 and the elastic sound-absorbing component 40. The second nut and the third nut are clamped on the flange 31 of the fan housing.

[0035] like Figure 1 The top of the top cover 10 has an upward convex structure 12 on its outer top and an upward concave structure on its inner top. The upward convex structure and the upward concave structure are arranged correspondingly, and the concave structure of the elastic sound-absorbing component 40 is opposite to the upward concave structure.

[0036] The inner wall of the top cover 10 is lined with a sound-absorbing perforated plate, and a layer of sound-absorbing material is filled between the inner wall of the top cover and the sound-absorbing perforated plate. Alternatively, the sound-absorbing perforated plate is made of stainless steel SS316, and the sound-absorbing material layer is made of fine glass wool.

[0037] like Figure 7 , Figure 8A motor bracket 33 is welded to the air inlet end of the fan housing 30, and a motor 34 is mounted on the motor bracket. The motor shaft is connected to the fan blade 35. A filter screen 36 is installed at the air inlet end. The filter screen is installed on the inner flange 37 of the fan housing. The motor shaft passes through the filter screen and is connected to the fan blade.

[0038] The bottom end of the fan housing 30, i.e., the exhaust end, is installed on the flange of the ship's air duct. The fan blades 35 inside the fan housing rotate, and external gas enters the fan housing 30 through the gap between the top cover 10 and the air inlet end of the fan housing, and then enters the ship's air duct through the exhaust end. Before the external gas enters the gap between the top cover 10 and the air inlet end of the fan housing 30 and before entering the fan housing itself, the gas is compressed and then released due to changes in the cross-sectional area of ​​the airflow channel, which may generate noise. The elastic silencer 40 of this invention withstands the gas pressure, contracting when the gas pressure increases, thus reducing the buffer space; and expanding when the gas pressure decreases, thus increasing the buffer space 41. In this way, the elastic silencer acts as a pressure damper, eliminating gas pressure changes and allowing gas to enter the fan housing 30 stably, thereby eliminating the noise generated during fan operation.

[0039] Loosening the second nut 22 and the third nut 23 allows adjustment of the relative height of the top cover 10 relative to the fan housing 30 to accommodate the confined spaces on ships and offshore platforms.

[0040] The electric control switch is located on the outer top of the top cover 10 or on the outer side wall of the fan housing 30, and is connected to the motor 34 via a wire.

[0041] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A wind turbine silencing device for easy installation on civilian ships, comprising a top cover (10) and a threaded connector (20), the top cover being mushroom-shaped, having a first connection hole (11), the threaded connector fitting into the first connection hole, the threaded connector mounting the top cover onto the flange of the wind turbine housing (30), characterized in that: The outer diameter of the top cover is larger than the outer diameter of the fan casing. There is an axial gap between the top cover and the air inlet end of the fan casing. An elastic silencing component (40) is installed on the inner top wall of the top cover. The elastic silencing component is bowl-shaped. The elastic silencing component and the inner top wall of the top cover form a sealed buffer space (41).

2. The wind turbine silencing device for easy installation on civilian ships as described in claim 1, characterized in that: The edge of the elastic silencing component (40) is provided with a second connection hole (42), and the flange (31) of the fan housing is provided with a third connection hole. The threaded connector (20) connects the first connection hole, the second connection hole and the third connection hole at the same time, connecting the top cover (10), the elastic silencing component and the fan housing (30) together.

3. The wind turbine silencing device for easy installation on civilian ships as described in claim 1, characterized in that: The threaded connector (20) is equipped with a first nut (21), a second nut (22) and a third nut (23). The head of the threaded connector is clamped with the first nut to the top cover (10) and the elastic silencer (40). The second nut and the third nut are clamped on the flange (31) of the fan housing.

4. The wind turbine silencing device for easy installation on civilian ships as described in claim 1, characterized in that: The top of the top cover (10) is provided with an upward convex structure (12), and the top of the top cover is provided with an upward concave structure. The upward convex structure and the upward concave structure are provided in correspondence. The concave structure of the elastic sound-absorbing component (40) is opposite to the upward concave structure.

5. The wind turbine silencing device for easy installation on civilian ships as described in claim 1, characterized in that: The inner wall of the top cover (10) is covered with a sound-absorbing perforated plate, and a layer of sound-absorbing material is filled between the inner wall of the top cover and the sound-absorbing perforated plate.

6. The wind turbine silencing device for easy installation on civilian ships as described in claim 1, characterized in that: A motor bracket (33) is welded to the air inlet end of the fan housing (30), and a motor (34) is installed on the motor bracket. The motor shaft is connected to the fan blade (35). A filter screen (36) is installed at the air inlet end. The filter screen is installed on the inner flange (37) of the fan housing. The motor shaft passes through the filter screen and is connected to the fan blade.

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