Silencer and fan

Abstract

The silencer comprises panels, four panels used for being assembled into a rectangular air pipe section in total, a connecting flange is arranged at the end, used for being connected with the other panels, of one panel, and the end, used for being connected with the other panels, of one panel is connected with the other panels through detachable connecting pieces; the plurality of positioning assemblies are positioned on the pair of panels which are parallel and opposite to each other; and the noise reduction units correspond to the positioning assemblies one to one and are fixedly installed on the positioning assemblies, and the noise reduction units and the positioning assemblies are detachably fixed or fixed through detachable connection structures or non-detachable connection structures after arriving at the site. The silencer is convenient to disassemble, so that the storage and transportation space can be saved.

Description

Technical Field

[0001] The utility model relates to a silencer for a large-scale fan. The fan is generally measured by the impeller diameter, and a fan with an impeller diameter greater than or equal to 3m is called a large-scale fan. The utility model also relates to a fan equipped with the silencer. Background Art

[0002] Anyone with a little life experience knows that fans often generate very loud noise when in operation. Even small industrial blowers with an impeller diameter of 20cm often produce noise levels exceeding 80 decibels without a muffler. Large fans typically have impeller diameters greater than or equal to 300cm, and their outlet duct dimensions are typically greater than or equal to 300×300 (mm, for rectangular outlet ducts, referring to cross-sectional dimensions) or 150mm (mm, for circular outlet ducts, referring to cross-sectional dimensions). Without a muffler installed on the outlet duct, the resulting noise environment is undoubtedly unsuitable for workers.

[0003] There are four main types of fan noise, namely mechanical noise, electromagnetic noise, resonance noise and aerodynamic noise. Among them, aerodynamic noise is the main noise. Aerodynamic noise includes rotation noise and eddy current noise. Both noises are generated inside the fan casing. Therefore, the fan noise can be effectively reduced by installing a silencer at the air outlet pipe (outlet).

[0004] Because large fans are relatively large, their installation dimensions are often positively correlated with their impeller size. Fans are often manufactured and assembled in a fan workshop before being shipped complete to their intended location. However, fans, and especially mufflers, are largely hollow within. In other words, the space they occupy is determined by their outer contours rather than the volume of their physical components. Therefore, even when assembled, a muffler takes up a relatively large amount of space during storage and transportation. Utility Model Content

[0005] The purpose of the utility model is to provide a muffler which is easy to disassemble and can save storage and transportation space; the utility model also provides a fan equipped with the muffler.

[0006] According to a first aspect of an embodiment of the present utility model, a muffler is provided, adapted for a fan having a rectangular air outlet duct, the muffler comprising:

[0007] There are four panels in total for assembling into a rectangular duct section, and one panel has a connecting flange at its end for connecting with other panels so as to be connected using a detachable connector;

[0008] There are a plurality of positioning components, which are located on a pair of parallel and opposite panels; and

[0009] The silencer unit corresponds to the positioning assembly one by one and is fixedly installed on the positioning assembly. The fixing method between the silencer unit and the positioning assembly is detachable fixing or fixing using a detachable connection or a non-detachable connection structure after arriving at the site.

[0010] Optionally, a positioning assembly includes two positioning units to be fixed on corresponding panels respectively;

[0011] Each positioning unit includes:

[0012] A guide portion, used to guide the muffler unit inserted by plug-in after the rectangular duct section is formed;

[0013] The supporting portion is located at the end of the positioning unit in the insertion direction to support the corresponding silencer unit.

[0014] Optionally, the guide portion of each positioning unit has at least one guide portion;

[0015] The guiding portion includes a pair of baffle bodies arranged in parallel.

[0016] Optionally, the support portion has an arc-shaped or conical bottom;

[0017] Correspondingly, the portion of the muffler unit used to cooperate with the support portion has an arc-shaped head or a conical head.

[0018] Optionally, the support portion further includes a positioning baffle located on each side of the arc-shaped or conical bottom.

[0019] Optionally, the arc-shaped head is an arc-shaped head with a chord plate, and the conical head is correspondingly a conical head with a bottom plate; or

[0020] The arc-shaped head is an arc-shaped head with an open chord side, and the conical head is correspondingly a conical head with an open bottom.

[0021] Optionally, the muffler unit includes a frame and a pair of structural plates fixed to the frame and arranged parallel to each other to form a third cavity;

[0022] Correspondingly, a third sound-absorbing medium layer is provided in the third cavity;

[0023] The structural plate is a mesh or a porous plate.

[0024] Optionally, the panel is a sound-absorbing panel, and the sound-absorbing panel is constructed as follows:

[0025] An inner plate, used for mounting the positioning assembly, and the inner plate is a porous plate;

[0026] an outer side plate, and an outer side plate, arranged parallel to the inner side plate to form an inter-plate space;

[0027] Flange plates are sealed around the space between the plates to form a sound-absorbing space;

[0028] The sound-absorbing medium layer is located in the sound-absorbing space.

[0029] Optionally, the outer surface of the outer plate is provided with crisscross ribs.

[0030] According to a second aspect of an embodiment of the present utility model, a fan is provided, wherein an air outlet pipe of the fan is installed with the silencer described in the first aspect of the embodiment of the present utility model.

[0031] In an embodiment of the present invention, a silencer is provided, in which connecting flanges are provided between the panels used to construct a rectangular air duct section at the interconnected ends, and a detachable connection structure is constructed by, for example, bolt connection. The silencer unit located in the rectangular air duct section is positioned and installed using a positioning assembly, and the silencer unit and the positioning assembly are connected using a detachable connector or fixed using a detachable or non-detachable structure after arriving at the site, so that under storage and transportation conditions, the silencer is stored and transported in loose parts, and the main body is a plate structure, which greatly reduces the storage and transportation space. And because flange connection is mainly adopted, even for traditional silencers, the silencer unit is easy to disassemble and assemble with the corresponding rectangular air duct section, which is convenient for maintenance. In other words, even if the traditional fixing method of the silencer unit is adopted, it is easy to disassemble and assemble as a whole, so that the overall disassembly is relatively convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of a muffler in one embodiment.

[0033] Figure 2 Schematic diagram of the three-dimensional structure of a sound-absorbing panel (second sound-absorbing panel) provided with a positioning unit in one embodiment.

[0034] Figure 3 This is a schematic diagram of the left-side cross-section structure of the second sound-absorbing panel in one embodiment.

[0035] Figure 4 Schematic diagram of the back structure of a sound-absorbing panel (first sound-absorbing panel) without a positioning unit in one embodiment.

[0036] Figure 5 This is a schematic diagram of the left-side cross-section structure of the first sound-absorbing panel in one embodiment.

[0037] Figure 6 Schematic diagram of the frame structure of the silencer unit in one embodiment.

[0038] Figure 7 This is a schematic diagram of the left-side cross-section structure of a muffler unit in one embodiment.

[0039] Figure 8 for Figure 7Enlarged view of part I.

[0040] Figure 9 This is a schematic diagram of the left-side cross-section structure of a silencer unit in another embodiment.

[0041] In the figure: 1. Interface flange, 2. First silencer panel, 3. First flange, 4. Baffle, 5. Silencer unit, 6. Second silencer panel, 7. Positioning support plate.

[0042] 21. Second connecting flange, 22. Second transverse rib, 23. Second outer plate, 24. Second flange unit, 25. Second longitudinal rib, 26. Second sound-absorbing medium layer, 27. Second inner plate, 28. Second reinforcing partition.

[0043] 51. Triangular support cone, 52. Horizontal brace, 53. Vertical brace, 54. Third connecting flange, 55. First structural plate, 56. Third sound-absorbing medium layer, 57. Second structural plate, 58. Cavity, 59. Bent support cone.

[0044] 61. First connecting flange, 62. First flange unit, 63. First inner plate, 64. First sound-absorbing medium layer, 66. First longitudinal rib, 67. First transverse rib, 68. First outer plate. DETAILED DESCRIPTION

[0045] In an embodiment of the present invention, there is a definite inside and outside, and in an embodiment of the present invention, the silencer provided is suitable for a fan with a rectangular air outlet duct. As an adaptive installation, the outer contour of the silencer is a rectangular parallelepiped structure with four panels. The four panels are arranged in two pairs, and the two inner panels are parallel to each other, and the two pairs of panels are perpendicular to each other.

[0046] In the embodiments of the present invention, the panels used are mainly sound-absorbing panels, and the following description will mainly focus on the sound-absorbing panels.

[0047] exist Figure 1 In the illustrated structure, the interface flange 1 is the flange for assembling the muffler on the air duct of the fan. Accordingly, the air duct is a rectangular air duct.

[0048] exist Figure 1 In the illustrated structure, for the convenience of description, the pipe shell assembled by four sound-absorbing panels is called a rectangular air duct segment, indicating that it constitutes a section of the rectangular air duct.

[0049] At the same time, in order to facilitate the distinction, Figure 1 The pair of sound-absorbing panels shown in the figure is called the first sound-absorbing panels 2, and the other pair of sound-absorbing panels is called the second sound-absorbing panels 6. The two pairs of sound-absorbing panels are different in size and shape. Among them, the second sound-absorbing panels 6 in the figure are relatively wide, while the first sound-absorbing panels 2 are relatively narrow.

[0050] Furthermore, a positioning assembly for assembling the silencer unit 5 is provided on the inner surface of the second silencer panel 6. The first silencer panel 2 is arranged parallel to the silencer unit 5.

[0051] Figure 2 In the embodiment, the second sound-absorbing panel 6 has first connecting flanges 61 at both ends. Figure 4 In the illustrated structure, second connection flanges 21 are provided at both ends of the first sound-absorbing panel 2 .

[0052] In addition, since the sound-absorbing panels are generally provided with a sound-absorbing medium layer, the part used for sound-absorbing is often thicker, while the connecting flange used for connecting the sound-absorbing panels can be relatively thin. Figure 2 In the illustrated structure, the portion where the first connecting flange 62 is provided is relatively thinner than the plate portion of the second sound-absorbing panel 6 , thereby forming a positioning step.

[0053] Accordingly, the first sound-absorbing panel 2 is positioned at the end of the second sound-absorbing panel 6 via the positioning step.

[0054] In addition, from Figure 2 In the illustrated structure, a first hole is formed on the first connecting flange 61, and Figure 4 In the illustrated structure, a second hole is opened on the second connecting flange 21, and the first hole and the second hole are aligned one by one. After the silencer in the form of loose parts is transported to the site, it is fixed by, for example, using bolts to penetrate the first hole and the second hole in sequence.

[0055] In the state of disassembled parts, the panels and the 5 silencer units can be stacked, thereby saving storage and transportation space.

[0056] As for the silencer unit 5, both ends thereof are positioned on the two second silencer panels 6. Accordingly, the two second silencer panels 6 are symmetrically arranged on the rectangular air duct section.

[0057] Figure 2 The figure shows the structure of one of the second sound-absorbing panels 6 , and the other one is symmetrical to the second sound-absorbing panel 6 .

[0058] exist Figure 2 In the illustrated structure, a baffle 4 and a positioning support plate 7 are provided on the inner surface of the second sound-absorbing panel 6. The baffle 4 forms a groove structure in the figure, and the positioning support plate 7 forms a groove structure with a sealed lower end. Figure 2 In the illustrated structure, there is a one-to-one correspondence between the positioning support plates 7 and alignment in the up and down directions. For the convenience of description, the unit used to position a silencer unit 5 located on the two second silencer panels 6 is called a positioning component, so that the silencer unit 5 can be inserted into the positioning component in a plug-in manner.

[0059] What is shown in the figure is only an example. In some embodiments, the baffle 4 can extend up and down with the positioning support plate 7 to form a whole.

[0060] In other embodiments, a positioning unit in Figure 2 There can be multiple baffles 4 arranged in the upper and lower directions.

[0061] exist Figure 2 In the illustrated structure, each positioning unit on each side has only one baffle 4 to minimize the impact on the flow capacity of the airflow.

[0062] exist Figure 2 In the illustrated structure, as mentioned above, the baffle 4 is essentially a pair of plates and Figure 2 The first inner plate 63 shown in FIG is formed by cooperation, which is roughly a U-shaped structure, and can also be understood as a groove structure. The groove structure can be composed of a single U-shaped structural member. When the silencer unit 5 is inserted, the groove structure plays a guiding role and also plays a role in Figure 2 The second sound-absorbing panel 6 has a limiting effect in the width direction. After the sound-absorbing unit 5 is inserted into place, the groove structure plays the aforementioned limiting role for the sound-absorbing unit 5. However, for fixing the sound-absorbing unit 5, screw holes can be opened on the baffle 4, so that the sound-absorbing unit 5 can be assembled on the rectangular air duct section using screws on site.

[0063] In some embodiments, a non-detachable connection method can also be used. After arriving at the site, the silencer unit 5 is fixed to the baffle 4 by, for example, riveting.

[0064] Considering the flexibility of the overall assembly, the positioning support plate 7 and the silencer unit 5 can also be fixed in a detachable or non-detachable connection manner.

[0065] Regarding riveting, rivet holes can be pre-opened on the support plate 7, and on site, auxiliary holes aligned with the rivet holes are opened on the silencer panel using the rivet holes as positioning references, and then riveting is performed using, for example, rivets.

[0066] In some embodiments, the baffle 4 can be made of non-metallic parts, such as plastic parts, and can be assembled on site using, for example, self-tapping screws.

[0067] If the silencing medium is made of non-combustible (combustion grade A) material, since the first structural plate 55 on the silencing unit 5 is usually made of a metal mesh plate, the silencing unit 5 and the baffle 4 can be connected by welding.

[0068] In a simpler application, for example, the rivet holes can be configured as rope holes, and the silencer unit can be tied and fixed on site using, for example, cable ties. In this case, the silencer unit does not need to be drilled with holes, and can be tied directly using, for example, holes in a porous plate or mesh.

[0069] exist Figure 1 In the illustrated structure, there are nine silencer units 5 and nine corresponding positioning components, and there is a one-to-one correspondence between the silencer units 5 and the positioning components.

[0070] Assembly based on plug-in method is relatively efficient.

[0071] In summary, the silencer unit 5 corresponds to the positioning assembly in a one-to-one manner, and the silencer unit 5 is fixedly mounted on the positioning assembly. Both a detachable connection and a non-detachable connection can be used for fixing.

[0072] It is pointed out in the previous article that a positioning assembly includes two positioning units. One positioning unit included in a positioning assembly is fixed on a second sound-absorbing panel 6, and the other positioning unit is fixed on another second sound-absorbing panel 6. Obviously, the two positioning units included in the same positioning assembly are arranged symmetrically with each other, and the two positioning units included in the same positioning assembly are aligned based on the parallelism between the sound-absorbing unit 5 and the first sound-absorbing panel 2.

[0073] In terms of assembly, the muffler unit 5 needs to be formed after the rectangular air duct section is formed, and the guide portion provided by the positioning unit is used to guide the muffler unit 5 inserted by plug-in. As for the guide portion, it is shown in the above examples that it can be as follows Figure 2 The overall U-shaped baffle 4 shown in the figure may also be a through slot arranged upward.

[0074] The positioning unit also provides a support portion, such as Figure 2 The positioning support plate 7 shown in FIG is used to define the position for inserting the muffler unit 5 into place. Obviously, the support portion is located at the end of the positioning unit in the insertion direction to support the corresponding muffler unit 5.

[0075] In order to improve relatively reliable support, the support portion has an arc-shaped or conical bottom; the wrapping support presented by the arc-shaped or conical bottom can make the support more stable and the positioning accuracy is relatively high.

[0076] Correspondingly, the portion of the silencer unit 5 used to cooperate with the support portion has an arc-shaped head or a conical head, and the insertion end of the silencer unit 5 is supported in, for example, the positioning support plate 7 in a substantially matching manner.

[0077] As mentioned above, in order to improve the reliability of the fixation, the muffler unit 5 and the positioning support plate 7 can also be fixed, and further, the support portion further includes a positioning baffle on each side of the arc or cone bottom, and the structure is as follows: Figure 2 The positioning support plate 7 shown in the figure, wherein the positioning baffle is used to be fixedly connected to the muffler unit 5.

[0078] Figure 8 and Figure 9 Two structural parts of the muffler unit 5 are shown for engaging with, for example, a positioning support plate 7, wherein Figure 8 The illustrated structure is a triangular support cone 51, the construction of which is Figure 6 In the illustrated structure, the skeleton portion of the silencer unit 5 has a number of longitudinal braces 53 and transverse braces 52, wherein the transverse braces 52 are made of channel steel components, and the web of the transverse brace 52 located at the bottom of the figure is docked with the mouth of a V-shaped plate bent into a roughly equilateral angle steel shape, and then welded.

[0079] Figure 8 The first structural plate 55 and the second structural plate 57 are also fixed to the cross brace 52 by welding, which has a relatively good structural reliability, but the welding amount is relatively large.

[0080] in addition, Figure 8 The triangular support cone 51 in the figure can be expressed as a conical head or an arc-shaped head, and the part bent into a V-shaped plate can be replaced by an arc-shaped plate.

[0081] Figure 9 In the illustrated structure, this is equivalent to adding a 135° bend to the end of a V-shaped plate, such as an equilateral angle steel, to form parallel sections, known as parallel plates. Furthermore, the first structural plate 55 and the second structural plate 57 are welded between the two parallel plates, thereby reducing the overall welding effort.

[0082] In addition, Figure 8 In the illustrated structure, a cavity 58 is formed, and in Figure 9 In the illustrated structure, there is no cavity 58, which is convenient for filling with the sound-absorbing medium.

[0083] As for the sound-absorbing medium, sound-absorbing cotton is mainly used.

[0084] exist Figure 7 In the illustrated structure, the silencer unit 5 includes a frame and a pair of structural plates fixed on the frame and arranged parallel to each other, such as the frame including the cross brace 52 as shown in the figure, and the structural plates including the first structural plate 55 and the second structural plate 57, thereby forming a third cavity with the frame as the skeleton and the structural plates as the side panels.

[0085] Correspondingly, the third cavity has a third sound-absorbing medium layer 56. The structural plate is a mesh or a porous plate.

[0086] Regarding the framework, Figure 6 The structure shown in FIG. 5 is relatively clear, and mainly includes a frame structure composed of a transverse brace 52 and a longitudinal brace 53 , and the whole adopts a welded frame.

[0087] Regarding the first sound-absorbing panel 2 and the second sound-absorbing panel 6, except for slight differences in the corresponding connecting flange structures, the rest of the basic structure is the same. The plate body located on the inner side is generally made of porous plate, mesh plate or mesh sheet, while the plate body located on the outer side is mainly made of solid plate.

[0088] In addition, the inner side plate of the second sound-absorbing panel 6, such as Figure 3 The first inner plate 63 shown in the figure also serves as a base for mounting the positioning assembly.

[0089] For example, the space between the first inner plate 63 and the first outer plate 68 is filled with the first sound-absorbing medium layer 64 .

[0090] Regarding the first sound-absorbing panel 2 , reference is made to the relevant drawings and the aforementioned structure of the second sound-absorbing panel 6 , which shall apply accordingly.

[0091] In order to improve the overall strength, the outer surfaces of the first outer plate 68 and the second outer plate 23 are provided with crisscross ribs.

[0092] In addition, Figure 3 In the illustrated structure, a first reinforcing partition 65 is further provided between the first inner plate 63 and the first outer plate 68; Figure 5 In the illustrated structure, a second reinforcing partition plate 28 is further provided between the second outer plate 23 and the second inner plate 27 , so that the corresponding sound-absorbing panel has relatively better rigidity.

Claims

1. A muffler adapted for a fan with a rectangular air outlet duct, characterized in that: The muffler comprises: There are four panels in total for assembling into a rectangular duct section, and one panel has a connecting flange at its end for connecting with other panels so as to be connected using a detachable connector; There are a plurality of positioning components, which are located on a pair of parallel and opposite panels; and The silencer unit corresponds to the positioning assembly one by one and is fixedly installed on the positioning assembly. The fixing method between the silencer unit and the positioning assembly is detachable fixing or fixed using a detachable connection or a non-detachable connection structure after arriving at the site.

2. The muffler according to claim 1, characterized in that A positioning assembly includes two positioning units, which are respectively fixed on corresponding panels; Each positioning unit includes: A guide portion, used to guide the muffler unit inserted by plug-in after the rectangular duct section is formed; The supporting portion is located at the end of the positioning unit in the insertion direction to support the corresponding silencer unit.

3. The muffler according to claim 2, characterized in that The guide portion of each positioning unit has at least one guide portion; The guiding portion includes a pair of baffle bodies arranged in parallel.

4. The muffler according to claim 2 or 3, characterized in that: The support portion has an arc-shaped or conical bottom; Correspondingly, the portion of the muffler unit used to cooperate with the support portion has an arc-shaped head or a conical head.

5. The muffler according to claim 4, characterized in that The support portion further includes a positioning baffle located on each side of the arc-shaped or conical bottom.

6. The muffler according to claim 4, characterized in that The arc-shaped head is an arc-shaped head with a chord plate, and the conical head is correspondingly a conical head with a bottom plate; or The arc-shaped head is an arc-shaped head with an open chord side, and the conical head is correspondingly a conical head with an open bottom.

7. The muffler according to claim 1, wherein: The muffler unit includes a frame and a pair of structural plates fixed to the frame and arranged parallel to each other to form a third cavity; Correspondingly, a third sound-absorbing medium layer is provided in the third cavity; The structural plate is a mesh or a porous plate.

8. The muffler according to claim 1, wherein: The panel is a sound-absorbing panel, and the sound-absorbing panel is constructed as follows: An inner plate, used for mounting the positioning assembly, and the inner plate is a porous plate; an outer side plate, and an outer side plate, arranged parallel to the inner side plate to form an inter-plate space; Flange plates are sealed around the space between the plates to form a sound-absorbing space; The sound-absorbing medium layer is located in the sound-absorbing space.

9. The muffler according to claim 8, characterized in that The outer surface of the outer plate is provided with crisscross ribs.

10. A fan, characterized in that: The air outlet pipe of the fan is installed with the silencer according to any one of claims 1 to 9.

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