An exhaust silencing tower for a test stand

Abstract

The utility model provides a kind of exhaust muffling tower of test bed, including tower body, gas flow passage is provided in tower body, gas flow passage has air inlet and exhaust port;Gas flow passage is by multiple horizontal flow passage and multiple vertical flow passage and is sequentially staggered connection and constitutes meandering zigzag channel;Adjacent horizontal flow passage and vertical flow passage are connected by curved section transition;Each vertical flow passage completely located inside tower body is provided with sound-absorbing structure.The utility model passes through the gas flow passage in tower body and is designed as by multiple horizontal flow passage and vertical flow passage and is sequentially staggered connection and constitutes meandering zigzag channel, can in limited tower body space, extend the total path length of waste gas flowing through gas flow passage, to provide more sufficient space and time for sound-absorbing, it is favorable to improve sound-absorbing effect.Moreover, when waste gas flows through meandering zigzag gas flow passage, the flow velocity of waste gas can be reduced by multiple steering of waste gas.

Description

Technical Field

[0001] This utility model relates to the field of test bench exhaust gas treatment technology, and more specifically, to an exhaust silencer tower for a test bench. Background Technology

[0002] The content in this section only provides background information related to this utility model and may not constitute prior art.

[0003] Engines such as aircraft engines generate high-pressure, high-speed exhaust gases during testing. The aerodynamic noise generated during exhaust emissions is the primary noise source on test benches, severely polluting the workplace and surrounding environment. To control this noise, exhaust silencers have become an indispensable key piece of equipment for test benches.

[0004] Currently, common exhaust silencers typically employ a completely vertical gas flow channel inside the tower body. A silencer is installed within this vertical gas flow channel. Exhaust gas enters the tower body and flows along the gas flow channel, passing through the silencer before being discharged, thus achieving noise reduction.

[0005] However, in practical applications, it has been found that the effective silencing path length of this completely vertical gas flow channel depends entirely on the physical height of the tower. To obtain a longer silencing path and improve the noise reduction effect, it is necessary to increase the construction height of the tower, which not only leads to a sharp increase in engineering costs, but is also difficult to implement in many height-restricted sites. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide an exhaust muffler tower for a test bench, so as to overcome at least the above-mentioned drawbacks caused by the use of a completely vertical gas flow channel in existing exhaust mufflers.

[0007] The objective of this utility model is achieved through the following technical solution: This utility model provides an exhaust silencer tower for a test bench, including a tower body, wherein a gas flow channel is provided in the tower body, and the gas flow channel has an air inlet and an exhaust outlet. The gas flow channel is a meandering channel formed by multiple horizontal flow channels and multiple vertical flow channels connected in an alternating manner; The adjacent horizontal flow channels and the vertical flow channels are connected by a curved section. Each of the vertical DC channels, which are entirely located inside the tower body, is equipped with a sound-absorbing structure.

[0008] Optionally, two adjacent vertical straight channels are symmetrically distributed with the central axis of the tower body as the center.

[0009] Optionally, the first section of the gas flow channel is a horizontal flow channel, and the last section of the gas flow channel is a vertical flow channel. One end of the first flow channel serves as the air inlet and extends outside the tower body; One end of the final flow channel serves as the exhaust port and extends outside the tower body.

[0010] Optionally, the first flow channel is located at the bottom of the gas flow channel, and the last flow channel is located at the top of the gas flow channel.

[0011] Optionally, the tower body is provided with a rain cap located directly above the exhaust port.

[0012] Optionally, the length of the horizontal flow channel, which is entirely located inside the tower body, is less than the length of the vertical flow channel.

[0013] Optionally, the tower body is provided with a sound-absorbing cavity that corresponds one-to-one with each of the vertical direct current channels located entirely inside the tower body; the sound-absorbing cavity is filled with sound-absorbing material; Each of the vertical direct current channels, which are entirely located inside the tower body, is housed within its corresponding silencing cavity.

[0014] Optionally, the sound-absorbing material is sound-absorbing cotton.

[0015] Optionally, the curved section is a smooth arc-shaped bend; the ratio of the radius of curvature R of the centerline of the arc-shaped bend to the pipe diameter D satisfies: 0.8≤R / D≤1.5.

[0016] Optionally, a primary filter structure is provided in the gas flow channel near the air inlet; a secondary filter structure is provided in the gas flow channel near the exhaust port.

[0017] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects: The exhaust silencer tower provided by this utility model designs the gas flow channel inside the tower as a meandering channel composed of multiple horizontal and vertical flow channels connected in a staggered manner. This design extends the total path length of the exhaust gas flow within the limited tower space, providing more space and time for silencing and thus improving the silencing effect. Furthermore, the multiple turns of the exhaust gas as it flows through the meandering gas flow channel reduce its velocity. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of an exhaust silencer tower provided for an embodiment of this utility model; Figure 2 for Figure 1 A sectional view; Figure 3 A schematic diagram of the gas flow channel provided for an embodiment of this utility model; Figure 4 for Figure 2 Enlarged view of the local structure at point A in the middle.

[0019] Icons: 10-Tower body, 11-Silencer chamber, 20-Base, 30-Gas flow channel, 31-Horizontal flow channel, 32-Vertical flow channel, 33-Bend section, 40-Air inlet, 50-Exhaust port, 60-Silencer structure, 70-Rain cap, 80-Primary filter structure, 90-Secondary filter structure. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments. The same reference numerals in the accompanying drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of protection of this utility model may have fewer components, have other components not shown in the drawings, different components, components with different arrangements, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0022] An embodiment of this utility model provides an exhaust muffler tower for a test bench. Figure 1 The schematic diagram illustrates the structure of the exhaust muffler tower provided by this utility model. Figure 2 for Figure 1 A sectional view.

[0023] like Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, the exhaust silencer tower may include a tower body 10. The tower body 10 may be cylindrical and extend vertically, and a base 20 may be provided at the bottom of the tower body 10 to provide stable support for the tower body 10. At the same time, a gas flow channel 30 is provided inside the tower body 10, and the gas flow channel 30 has an air inlet 40 and an exhaust outlet 50.

[0024] The air inlet 40 is used to receive the noisy exhaust gas generated during engine testing, such as that of an aircraft engine. The exhaust gas can flow through the gas flow channel 30 and then be discharged from the exhaust port 50. Specifically, the air inlet 40 can be connected to the perforated diffuser of a test stand known in the prior art, so that the exhaust gas can be decelerated by the perforated diffuser before entering the gas flow channel 30.

[0025] Unlike the completely vertical gas flow channel 30 used in existing exhaust silencers, referring to Figure 2 and Figure 3 As shown, the exhaust muffler tower provided in this embodiment of the present invention has a gas flow channel 30 that is a meandering channel formed by multiple horizontal flow channels 31 and multiple vertical flow channels 32 connected in a staggered manner. Adjacent horizontal flow channels 31 and vertical flow channels 32 are connected by a bend 33. Each vertical flow channel 32, which is completely located inside the tower body 10, is provided with a silencing structure 60. During the process of exhaust gas flowing through the gas flow channel 30, the silencing structure 60 in each vertical flow channel 32 can reduce noise. The silencing structure 60 can be, but is not limited to, honeycomb silencers or array silencers used in existing exhaust muffler towers.

[0026] According to an embodiment of this utility model, by designing the gas flow channel 30 within the tower body 10 as a meandering channel composed of multiple horizontal flow channels 31 and vertical straight channels 32 connected in a staggered manner, the technical constraint that the silencing path length in existing exhaust silencing towers depends on the vertical height of the tower body 10 is broken. This structural design can extend the total path length of the exhaust gas flow through the gas flow channel 30 within the limited space of the tower body 10, thereby providing more space and time for silencing and improving the silencing effect. Furthermore, when the exhaust gas flows through the meandering gas flow channel 30, the flow velocity of the exhaust gas can be reduced through multiple turns of the exhaust gas.

[0027] In some possible embodiments, refer to Figure 2 As shown, two adjacent vertical straight channels 32 are symmetrically distributed with the central axis of the tower body 10 as the center. It can also be understood that the multiple vertical straight channels 32 are divided into two groups, and the two groups of vertical straight channels 32 are symmetrically distributed with the central axis of the tower body 10 as the center.

[0028] This symmetrical structure makes the arrangement of each flow channel in the horizontal direction of the tower body 10 more compact and regular, which can minimize the lateral space occupied by the gas flow channel 30. This allows for a significant reduction in the volume of the tower body 10 in the horizontal direction while ensuring the same effective noise reduction path length, which is conducive to further reducing the manufacturing cost and floor space of the tower body 10.

[0029] In some possible embodiments, the first section of the gas flow channel 30 is a horizontal flow channel 31, and the last section of the gas flow channel 30 is a vertical straight flow channel 32. The first section of the flow channel refers to the first section of the gas flow channel 30 along the direction of exhaust gas flow, and the last section of the flow channel refers to the last section of the gas flow channel 30 along the direction of exhaust gas flow.

[0030] One end of the first flow channel serves as an air inlet 40, extending beyond the circumferential sidewall of the tower body 10 to allow the air inlet 40 to communicate with the aforementioned test bench's opening expander. One end of the last flow channel serves as an exhaust outlet 50, extending beyond the top of the tower body 10 to allow the exhaust outlet 50 to discharge the treated exhaust gas to the outside.

[0031] This structural design makes it easier to connect the air inlet 40 to the opening expander, while the upward setting of the exhaust port 50 is conducive to the high-altitude diffusion of exhaust gas.

[0032] In some possible embodiments, the first flow channel is located at the bottom of the gas flow channel 30, and the last flow channel is located at the top of the gas flow channel 30. With this configuration, after the exhaust gas enters the gas flow channel 30 through the inlet 40, the exhaust gas will flow upward through the gas flow channel 30 and then be discharged through the outlet 50.

[0033] In some possible embodiments, a rain cap 70 may also be provided on the top of the tower body 10, located directly above the exhaust port 50. The rain cap 70 can protect the exhaust port 50, so as to prevent external objects such as rainwater and foreign objects from flowing back into the gas flow channel 30 through the exhaust port 50.

[0034] In some possible embodiments, refer to Figure 2 or Figure 3 As shown, the length of the horizontal flow channel 31, which is entirely located inside the tower body 10, is less than the length of the vertical flow channel 32. This design allows more lateral space inside the tower body 10 to be allocated to the vertical flow channel 32. While ensuring the meandering of the gas flow channel 30 to extend the exhaust gas flow path, it can maximize the diameter of the vertical flow channel 32, thereby making it possible to arrange a larger silencing structure 60 within the vertical flow channel 32 to improve the silencing effect of each section of the vertical flow channel 32.

[0035] In some possible embodiments, the tower body 10 may also be provided with silencing cavities 11 corresponding one-to-one with the vertical direct current channels 32 located entirely inside the tower body 10. Each silencing cavity 11 is filled with silencing material (not shown in the figure).

[0036] Each vertical direct current channel 32, which is entirely located inside the tower body 10, is housed within its corresponding silencing cavity 11.

[0037] By setting an independent silencing cavity 11 for each vertical direct current channel 32 and filling it with silencing material, when noise follows the exhaust gas through the vertical direct current channel 32, not only can the silencing structure 60 in the vertical direct current channel 32 reduce the noise, but some of the noise that passes through the pipe wall of the vertical direct current channel 32 can also be absorbed by the silencing material in the silencing cavity 11, which significantly improves the overall silencing effect.

[0038] For example, the sound-absorbing material can be low-cost and easy-to-fill sound-absorbing cotton.

[0039] In some possible embodiments, refer to Figure 4 As shown, the curved section 33 used to connect adjacent horizontal flow channels 31 and vertical flow channels 32 can specifically be a smooth arc-shaped bend. Furthermore, the ratio of the radius of curvature R of the centerline of this arc-shaped bend to the pipe diameter D satisfies: 0.8 ≤ R / D ≤ 1.5.

[0040] By using an arc-shaped bend as the bending section 33 and further limiting the ratio of the centerline curvature radius R of the arc-shaped bend to the pipe diameter D, it is beneficial for the bending section 33 to smoothly guide the exhaust gas to change direction. At the same time, it is beneficial to reduce the regeneration noise generated by the exhaust gas impacting the pipe wall of the bending section 33 when it flows through the bending section 33, which helps to achieve efficient diversion with low noise and low resistance.

[0041] In some possible embodiments, refer to Figure 2 As shown, a primary filter structure 80 can be installed in the gas flow channel 30 near the air inlet 40, specifically in the first section of the flow channel; a secondary filter structure 90 can be installed in the gas flow channel 30 near the exhaust outlet 50, specifically in the last section of the flow channel. The primary filter structure 80 is mainly used to remove large particulate impurities and oil mist from the exhaust gas, to minimize pollution and blockage of the silencer structure 60 when the exhaust gas flows through the vertical flow channel 32. The secondary filter structure 90 is mainly used to further purify the exhaust gas after noise reduction treatment, to effectively remove fine particulate matter remaining in the exhaust gas, ultimately achieving synergistic treatment of noise and pollutants.

[0042] For example, the primary filtration structure 80 may be a pre-filter plate, and the secondary filtration structure 90 may be an activated carbon filter.

[0043] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An exhaust silencer tower for a test bench, comprising a tower body, wherein a gas flow channel is provided within the tower body, the gas flow channel having an inlet and an outlet; characterized in that, The gas flow channel is a meandering channel formed by multiple horizontal flow channels and multiple vertical flow channels connected in an alternating manner; The adjacent horizontal flow channels and the vertical flow channels are connected by a curved section. Each of the vertical DC channels, which are entirely located inside the tower body, is equipped with a sound-absorbing structure.

2. The exhaust silencer tower of the test bench according to claim 1, characterized in that, The two adjacent vertical straight channels are symmetrically distributed with the central axis of the tower as the center.

3. The exhaust silencer tower of the test bench according to claim 1, characterized in that, The first section of the gas flow channel is a horizontal flow channel, and the last section of the gas flow channel is a vertical flow channel. One end of the first flow channel serves as the air inlet and extends outside the tower body; One end of the final flow channel serves as the exhaust port and extends outside the tower body.

4. The exhaust silencer tower of the test bench according to claim 3, characterized in that, The first flow channel is located at the bottom of the gas flow channel, and the last flow channel is located at the top of the gas flow channel.

5. The exhaust silencer tower of the test bench according to claim 3, characterized in that, The tower body is equipped with a rain cap located directly above the exhaust port.

6. The exhaust silencer tower of the test bench according to claim 1, characterized in that, The length of the horizontal flow channel, which is entirely located inside the tower body, is less than the length of the vertical flow channel.

7. The exhaust silencer tower of the test bench according to claim 1, characterized in that, The tower body has a sound-absorbing cavity inside, which corresponds one-to-one with the vertical direct current channel located entirely inside the tower body; the sound-absorbing cavity is filled with sound-absorbing material; Each of the vertical direct current channels, which are entirely located inside the tower body, is housed within its corresponding silencing cavity.

8. The exhaust silencer tower of the test bench according to claim 7, characterized in that, The sound-absorbing material is sound-absorbing cotton.

9. The exhaust silencer tower of the test bench according to claim 1, characterized in that, The curved section is a smooth arc-shaped bend; the ratio of the radius of curvature R of the centerline of the arc-shaped bend to the pipe diameter D satisfies: 0.8≤R / D≤1.

5.

10. The exhaust silencer tower of the test bench according to claim 1, characterized in that, A primary filtration structure is provided in the gas flow channel near the air inlet; a secondary filtration structure is provided in the gas flow channel near the exhaust outlet.

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