Sound wave directivity smoke exhaust rainproof device for small turbojet engine test room

Abstract

The utility model discloses a sound wave directivity smoke exhaust rain-proof device for a small turbojet engine test room, which comprises a through cover shell, a funnel-shaped rain-proof hopper arranged in the cover shell and a support mechanism for fixing the rain-proof hopper in the cover shell, and the middle upper part of the cover shell is bent outwards to form a break angle of 135 + / -6 degrees. A rain blocking bin and a reflection bin are formed in the upper side and the lower side of the bent position of the cover shell. The cone angle of the rain shielding bucket is 120 + / -6 degrees; the side wall of the rain shielding hopper is perpendicular to the upper inner wall of the housing. The maximum diameter position of the rain shielding hopper is not higher than the plane where the maximum diameter of the housing is located, and the diameter ratio of the rain shielding hopper to the plane is 1: 1.2-1: 1.5. According to the sound wave directivity smoke exhaust rain-proof device for the small turbojet engine test room, on the premise that rain prevention, smoke exhaust and exhaust are achieved, the sound wave transmission and reflection characteristics are utilized, a path beneficial to sound wave transmission and reflection is formed by arranging the cover shell and the rain blocking hopper, and the influence of noise on the test room or factory workers is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke exhaust rain preventer, and more specifically, to a sonic wave directional smoke exhaust rain preventer for a small turbojet engine test room. Background Art

[0002] To protect the tail end of the exhaust or smoke exhaust duct from rain, a smoke exhaust rain screen is required. In a test room or factory with relatively loud noises, a smoke exhaust rain screen at the tail end of the exhaust or smoke exhaust system cannot prevent the noise waves from spreading around while protecting against rain. The noise directly affects the test room or factory staff.

[0003] The utility model patent with patent application number CN205876456U discloses a rainproof exhaust cap, which corresponds to the smoke outlet pipe of the generator set, and includes an exhaust cap installed at the end of the smoke outlet pipe, and a smoke outlet is arranged at the upper end of the exhaust cap; a rain collector is arranged inside the exhaust cap, and the rain collector is installed inside the exhaust cap through a bracket, and the rain collector is connected to a drain pipe, which passes through and is sealed and installed in the exhaust cap. The utility model has a reasonable design, can take into account the exhaust and rain protection of the generator set, and at the same time, the exhaust area and exhaust volume are increased without changing the diameter of the exhaust pipe, thereby improving the exhaust efficiency.

[0004] However, this device does not have a specific directional reflection characteristic for the sound waves of the noise in the exhaust pipe, and cannot effectively reduce the impact of noise on the test room or factory workers. Utility Model Content

[0005] An object of the present invention is to solve the above-mentioned problems and / or disadvantages and to provide advantages which will be described below.

[0006] In order to achieve these purposes and other advantages of the utility model, a sonic wave directional smoke exhaust rain preventer for a small turbojet engine test room is provided, comprising: a through-shaped cover shell, a funnel-shaped rain shield arranged in the cover shell, a supporting mechanism for fixing the rain shield to the inside of the cover shell, a drainage pipe group connecting the bottom of the rain shield and the outside of the cover shell, and a ring-shaped bottom plate arranged below the cover shell, the bottom plate is provided with an inwardly extending folded edge along the inner edge, and the lower end of the cover shell is provided with a drainage hole, characterized in that the upper and middle part of the cover shell is bent outward to form a folded angle of 135±6°, and the upper and lower ends are tightened toward the middle, so that the cover shell forms a rain shield and a reflection chamber on the upper and lower sides of the bending part;

[0007] The cone angle of the rain shield is 120±6°;

[0008] The side wall of the rain shield hopper and the inner wall of the rain shield bin are vertically arranged in space;

[0009] The maximum diameter of the rain shield is not higher than the plane where the maximum diameter of the shell is located, and the ratio of the two diameters is 1:1.2-1:1.5.

[0010] Preferably, the drainage pipe group is configured as three drainage pipes evenly arranged at the bottom of the rain shield;

[0011] The other end of the drain pipe is fixed to the cover shell.

[0012] Preferably, the support mechanism is configured as a plurality of sheet-like support plates arranged vertically on a horizontal plane, and each support plate is provided with a plurality of through holes;

[0013] The support plate is closely connected to the side wall of the rain shield, the upper end is closely connected to the corner of the cover shell, and the lower end is closely connected to the bottom plate and the folded edge.

[0014] Preferably, the bottom plate is provided with a plurality of circular holes;

[0015] A nut matching the position of the circular hole is arranged on the upper side of the circular hole.

[0016] Preferably, a protective net is provided at the opening above the cover shell.

[0017] Preferably, the hole spacing of the protective net is configured to be 25 mm and the hole diameter is configured to be 20 mm.

[0018] The utility model includes at least the following beneficial effects: under the premise of achieving rainproof smoke exhaust, the sound wave transmission and reflection characteristics are utilized, and specific angles and positions are set for the cover shell and the rain shield to form a path conducive to the transmission and reflection of sound waves, so that the sound waves of the noise in the exhaust pipe are reflected by the cover shell and the rain shield and then propagate upward, effectively reducing the impact of noise on the test room or factory staff.

[0019] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a sonic directional smoke exhaust rain preventer for a small turbojet engine test room in one embodiment of the utility model;

[0021] Figure 2 It is a cross-sectional view of a sonic directional smoke exhaust rain preventer for a small turbojet engine test room in one embodiment of the utility model;

[0022] Figure 3 The present invention is a schematic diagram of the sound wave propagation and rainwater path of a sound wave directional smoke exhaust rain preventer for a small turbojet engine test room in one embodiment of the present invention.

[0023] Markings in the figure: 1. cover shell, 11. drainage hole, 12. rain shield chamber, 13. reflection chamber, 14. folded corner, 2. rain shield, 3. support plate, 31. through hole, 4. bottom plate, 41. folded edge, 42. round hole, 43. nut, 5. drain pipe. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0025] It should be understood that terms such as “having”, “including” and “comprising” used herein do not recite the existence or addition of one or more other elements or combinations thereof.

[0026] It should be noted that in the description of the present invention, the orientation or position relationship indicated by the term is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present utility model, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0028] In addition, in the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] Example 1

[0030] A sonic directional smoke exhaust rain preventer for a small turbojet engine test room, the structure of which is as follows Figure 1-3As shown, it comprises: a through-shaped cover shell 1, a funnel-shaped rain shield 2 arranged in the cover shell 1, a supporting mechanism for fixing the rain shield 2 inside the cover shell 1, a drainage pipe group connecting the bottom of the rain shield 2 and the outside of the cover shell 1, and a ring-shaped bottom plate 4 arranged below the cover shell 1, the bottom plate 4 is provided with an inwardly extending folding edge 41 along the inner edge, and a drainage hole 11 is provided at the lower end of the cover shell 1, characterized in that the upper and middle parts of the cover shell 1 are bent outward to form a folding angle 14 of 135±6°, and the upper and lower ends are tightened toward the middle, so that the cover shell forms a rain shield chamber 12 and a reflection chamber 13 on the upper and lower sides of the bending part;

[0031] The cone angle of the rain shield 2 is 120±6°;

[0032] The side wall of the rain shield 2 and the inner wall of the rain shield bin 12 are vertically arranged in space;

[0033] The maximum diameter of the rain shield 2 is not higher than the plane where the maximum diameter of the housing 1 is located, and the ratio of the diameters of the two is 1:1.2-1:1.5.

[0034] In practical applications, the cover 1 and the rain shield 2 are both made of 1 mm 304# stainless steel plate, and the surface roughness is not greater than 0.8.

[0035] Working principle: When it rains, rainwater enters through the opening at the top of the cover 1 and falls into the rain shield 2 or the cover 1. The rainwater in the rain shield 2 is discharged through the bottom drainage pipe group. If the rainwater falls into the cover 1, it will be gathered at the lower end through the annular groove surrounded by the bottom plate 4 and the folded edge 41, and discharged through the drainage hole 11 at the lower end of the cover 1. The folded edge 41 cooperates with the exhaust pipe of the lower device and is used to dock with the exhaust pipe; the smoke or gas discharged from the exhaust pipe is guided by the rain shield 2 and discharged from the opening at the top of the cover 1. The sound waves of the noise in the exhaust pipe are reflected by the cover 1 and the rain shield 2 for many times, and finally propagate upward at the opening of the cover 1 (such as Figure 3 ).

[0036] On the premise of achieving rainproof smoke exhaust, the reflection characteristics of sound wave transmission are utilized, and specific angles and positions are set for the cover 1 and the rain shield 2 to form a path conducive to the transmission and reflection of sound waves. The sound waves of the noise in the exhaust pipe are reflected by the cover 1 and the rain shield 2 and then propagate upwards, effectively reducing the impact of noise on the test room or factory staff.

[0037] Example 2

[0038] This embodiment 2 is a preferred embodiment of the present invention, and its specific structure is as follows Figure 1 As shown, it discloses the following improvements based on the embodiment 1: the drainage pipe group is configured as three drainage pipes 5 evenly arranged at the bottom of the rain shield 2;

[0039] The other end of the drain pipe 5 is fixed to the housing 1 .

[0040] Working principle: three drainage pipes 5 are evenly distributed at the bottom of the rain shield 2 and connected and fixed to the cover 1 to support the rain shield 2 and increase the strength of the structure.

[0041] In actual application, the drainage pipe 5 is composed of three stainless steel pipes with an inner diameter of 23 mm, and three drainage holes with a diameter of 23 mm are provided at the lower end of the housing 1. The entire drainage diameter D is:

[0042] 3.14(23÷2) 2 ×6=2491.6mm2

[0043]

[0044] According to the requirements of heavy rainstorm rainfall: the rainfall per unit area of ​​1 square meter per hour is above 250 mm, the heavy rain flow Q can be calculated 1 :

[0045]

[0046] According to the flow calculation formula for drainage pipes (Formula 1) and the flow velocity calculation formula for drainage pipes under constant flow conditions (Formula 2) in the "Outdoor Drainage Design Standard" GB 50014-2021.

[0047] Flow calculation formula for drainage pipes (Formula 1):

[0048] QUR

[0049] Where: Q is the design flow rate (m 3 / s), A is the effective cross-sectional area of ​​water flow (m 2 ), v is the flow velocity (m / s).

[0050] The flow rate calculation formula of the drainage channel under constant flow conditions (Formula 2):

[0051]

[0052] Where: v is the flow velocity (m / s), R is the hydraulic radius (m), I is the hydraulic gradient, and n is the roughness coefficient.

[0053] According to Formula 1 and Formula 2, when the roughness coefficient n is 0.01 and the hydraulic gradient I is 0.385714, the drainage flow rate Q of the pipe with an inner diameter of 56.3 mm can be calculated. 2 :

[0054]

[0055] Q 2=11.9025×4.6561X10 -4

[0056] Q 2 =0.005542m 3 / S

[0057] By calculating Q 2 >Q 1 , the sum of the drainage flow of the drain pipe and the drain hole Q 2 Greater than the heavy rain flow Q 1 , that is, drainage is no problem.

[0058] Example 3

[0059] This embodiment 3 is a preferred embodiment of the present utility model, and the specific structure is as follows Figure 1-2 As shown, it discloses the following improvement based on the embodiment 1: the support mechanism is configured as a plurality of sheet-like support plates 3 arranged vertically on a horizontal plane, and each support plate 3 is provided with a plurality of through holes 31;

[0060] The support plate 3 is closely connected to the side wall of the rain shield 2 , the upper end is closely connected to the corner 14 of the cover shell 1 , and the lower end is closely connected to the bottom plate 4 and the folded edge 41 .

[0061] In actual applications, three support plates 3 are evenly arranged around the outside of the rain shield 2 to support and fix the rain shield 2. The edges of the support plates 3 are fitted along the shape of the inner wall of the cover shell 1 to make the rain shield 2 more firmly fixed. At the same time, the rain shield bin 12 and the reflection bin 13 are supported and positioned respectively to make the structure of the cover shell 1 more stable. Multiple through holes 31 allow gas and sound waves to pass through them, making their discharge smoother and reducing the support plates' blocking and refraction of noise and sound waves.

[0062] Example 4

[0063] This embodiment 4 is a preferred embodiment of the present utility model, and its specific structure is as follows Figure 1-2 As shown, it discloses the following improvements based on the embodiment 1: a plurality of circular holes 42 are provided on the bottom plate 4;

[0064] A nut 43 is disposed on the upper side of the circular hole 42 and matches the position of the circular hole 42 .

[0065] In actual application, six evenly distributed round holes 42 are provided on the bottom plate 4 , and a nut 43 is welded to each round hole 42 so that the screw hole of the nut 43 corresponds to the position of the round hole 42 .

[0066] Working principle: The position of the smoke exhaust rain preventer is fixed by bolts passing through the circular holes 42 and connecting with the nuts 43.

[0067] Example 5

[0068] This embodiment 5 is a preferred embodiment of the present utility model, which discloses the following improvements based on the embodiment 1: a protective net is provided at the opening above the cover shell.

[0069] The hole spacing of the protective net is configured to be 25 mm, and the hole diameter is configured to be 20 mm.

[0070] Working principle: The protective net can prevent birds and other objects from entering the cover, causing changes in the internal structure and affecting work.

[0071] The steps for making the acoustic wave directional smoke exhaust rain preventer for a small turbojet engine test room are as follows:

[0072] Step 1: Prepare materials, prepare 1mm thick 304# stainless steel;

[0073] Step 2: Laser cutting the bottom plate, cutting the bottom plate to an outer diameter of 841.5 mm and an inner diameter of 678 mm, and welding the nut to the circular hole 42 of the bottom plate 4;

[0074] Step 3: Cut 304# stainless steel drain pipe 5, the inner diameter of the drain pipe 5 is 23mm, the single-side wall thickness is 2mm, and the length is 450;

[0075] Step 4: Cut and weld the folded edge 41, cut and roll the 304# stainless steel tube, with an inner diameter of 678mm and a height of 100, and weld it to the bottom plate 4;

[0076] Step 5: Laser cut the support plate 3 according to the drawing;

[0077] Step 6: Laser cut 304# stainless steel according to the drawing, roll the pipe and weld it into rain shield 2. The weld should not leak.

[0078] Step 7: Laser cut 304# stainless steel according to the drawing, roll the tube and weld it into the reflective bin 13 of the cover 1. The weld must not leak. Weld the support plate 3 and the reflective bin 13 firmly, and weld them to the bottom plate 4 at the same time. There must be no leakage after full welding.

[0079] Step 8: Weld the rain shield 2 and the support plate 3 firmly, and weld the drain pipe 5 to the inner cone and the cover 1;

[0080] Step 9: Laser cut the rain shielding bin 12 of the cover shell 1 according to the drawing, and weld it to the reflective bin 13 of the cover shell 1 after rolling the tube. No water can be leaked after full welding.

[0081] Step 10: Laser cut the stainless steel plug mesh according to the diagram, and fix it on the top of the cover 1 by resistance welding a full circle.

[0082] The above solutions are only an illustration of a preferred example, but are not limited thereto. When implementing the present utility model, appropriate replacement and / or modification can be performed according to user needs.

[0083] The number of devices and processing scales described here are used to simplify the description of the utility model. Applications, modifications and variations of the utility model are obvious to those skilled in the art.

[0084] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A sonic directional smoke exhaust rain preventer for a small turbojet engine test room, comprising: A through-shaped cover shell, a funnel-shaped rain shield arranged inside the cover shell, a supporting mechanism for fixing the rain shield inside the cover shell, a drainage pipe group connecting the bottom of the rain shield and the outside of the cover shell, and a ring-shaped bottom plate arranged below the cover shell, the bottom plate is provided with an inwardly extending folded edge along the inner edge, and a drainage hole is provided at the lower end of the cover shell, characterized in that the upper and middle parts of the cover shell are bent outward to form a folding angle of 135±6°, and the upper and lower ends are tightened toward the middle, so that the cover shell forms a rain shield bin and a reflection bin on the upper and lower sides of the bend; The cone angle of the rain shield is 120±6°; The side wall of the rain shield hopper and the inner wall of the rain shield bin are vertically arranged in space; The maximum diameter of the rain shield is not higher than the plane where the maximum diameter of the shell is located, and the ratio of the two diameters is 1:1.2-1:1.

5.

2. The acoustic wave directional smoke exhaust rain preventer for a small turbojet engine test room as claimed in claim 1, characterized in that: The drainage pipe group is configured as three drainage pipes evenly arranged at the bottom of the rain shield; The other end of the drain pipe is fixed to the cover shell.

3. The acoustic wave directional smoke exhaust rain preventer for a small turbojet engine test room as claimed in claim 1, characterized in that: The support mechanism is configured as a plurality of sheet-like support plates arranged vertically on a horizontal plane, and each support plate is provided with a plurality of through holes; The support plate is closely connected to the side wall of the rain shield, the upper end is closely connected to the corner of the cover shell, and the lower end is closely connected to the bottom plate and the folded edge.

4. The acoustic wave directional smoke exhaust rain preventer for a small turbojet engine test room as claimed in claim 1, characterized in that: The bottom plate is provided with a plurality of circular holes; A nut matching the position of the circular hole is arranged on the upper side of the circular hole.

5. The acoustic wave directional smoke exhaust rain preventer for a small turbojet engine test room as claimed in claim 1, characterized in that: A protective net is arranged at the opening above the cover shell.

6. The acoustic wave directional smoke exhaust rain preventer for a small turbojet engine test room as claimed in claim 5, characterized in that: The hole spacing of the protective net is configured to be 25 mm, and the hole diameter is configured to be 20 mm.

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