Installation structure of working noise room air duct and wall body and working noise room

Abstract

The utility model relates to a kind of installation structure and working noise room of working noise room air pipe and wall, installation structure includes fixed air pipe being arranged in wall through-hole, the end of the fixed air pipe has the taper port of calibre tapering along air outflow direction, the fixed air pipe is fixed on wall by detachable fixing device along the axial compression of the fixed air pipe, the taper limiting cylinder for forming the limiting support of the taper port of the fixed air pipe is provided on the side of the wall away from working noise room, the taper of this taper limiting cylinder matches with the outer taper surface of the taper port of fixed air pipe.The taper limiting cylinder of wall back side and the taper port of fixed air pipe end precision match.Advantage is that: the taper surface cooperation between the taper limiting cylinder and the port of fixed air pipe not only provides radial support, ensures air pipe concentricity, more can convert part axial tension into radial compression force, forms self-reinforcing effect, greatly improves connection rigidity and sealing property, avoids airflow reflux.

Description

Technical Field

[0001] This utility model relates to the field of noise testing technology for range hoods, and in particular to an installation structure for the air duct and wall of a working noise room and a working noise room. Background Technology

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. Operating noise is the noise generated by the range hood under specified exhaust resistance. Compared to semi-anechoic chamber noise, the testing conditions for operating noise are closer to the actual usage conditions of users, making it an important parameter reflecting the sound performance of the range hood. In the laboratory, staff often use the relevant procedures in GB / T 17713-2022 "Range Hoods and Other Cooking Smoke Extraction Devices" to set up the environment of the operating noise chamber and conduct related tests.

[0003] During testing, a fixed duct needs to be connected after the range hood's exhaust pipe (usually a corrugated pipe). Since the fixed duct's interface is not a fixed size and needs to match the exhaust pipe, the fixed duct must be detachably fixed to the wall. During testing, the fixed duct is replaced based on the range hood's exhaust pipe size. Because the exhaust pipe is corrugated and has a certain degree of elasticity, after installation, it exerts a pulling force on the fixed duct, causing it to be pulled out of the wall. If the fixed duct is not securely fixed to the wall, problems such as airflow backflow and inaccurate noise test values ​​may occur. In actual testing, multiple turns of sealing tape are typically used to secure the fixed duct. However, this tape-based fixing method has drawbacks: disassembly is cumbersome, the tape wrapping varies each time, introducing systematic errors into the noise test. In particular, the fixing strength is relatively low; under the pulling force of the exhaust pipe, the tape bond can easily come loose.

[0004] Therefore, the existing installation structure of air ducts and walls in noise rooms needs further improvement. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to provide an installation structure for working noise room ducts and walls that can effectively improve the portability and reliability of fixed duct disassembly and replacement, in light of the current state of the technology.

[0006] The second technical problem to be solved by this utility model is to provide a working noise room that uses the above-mentioned installation structure of air duct and wall, in view of the current situation of the prior art.

[0007] The technical solution adopted by this utility model to solve the first technical problem is as follows: an installation structure of a duct for a working noise room and a wall, including a fixed duct that passes through a through hole in the wall, the end of the fixed duct having a tapered port with a gradually decreasing diameter along the airflow direction, the fixed duct being pressed and fixed to the wall along the axial direction of the fixed duct by a detachable fixing device, and a tapered limiting cylinder for limiting support of the tapered port of the fixed duct being provided on the side of the wall away from the working noise room, the tapered limiting cylinder matching the outer tapered surface of the tapered port of the fixed duct.

[0008] As an improvement, an annular sealing gasket is embedded in the inner wall of the conical limiting cylinder. The conical end of the fixed air duct passes through the wall through-hole from one side of the working noise room and presses against the annular sealing gasket, causing radial compression deformation of the annular sealing gasket to achieve a seal. This structural design allows for radial compression, ensuring the sealing gasket fits tightly against the conical gap and eliminating sound leakage channels. The sealing gasket automatically fills irregular gaps under the pressure of the conical surface, compensating for manufacturing errors.

[0009] As an improvement, the conical limiting cylinder includes a conical section and an annular mounting portion extending radially outward from the large port of the conical section. The annular mounting portion is fixedly connected to the side of the wall facing away from the working noise room. The design of the annular mounting portion provides a large fixing surface, ensuring that the conical section and the through hole in the wall are concentric, and also allows the duct thrust to be evenly transmitted to the wall, avoiding local stress concentration.

[0010] As an improvement, the annular sealing gasket includes a conical section and an annular section extending radially outward from the large port of the conical section. The annular section of the annular sealing gasket is pressed between the annular mounting portion of the conical limiting cylinder and the sidewall of the wall. The conical section of the annular sealing gasket is pressed between the conical section of the conical limiting cylinder and the outer conical surface of the conical port of the fixed duct. The annular section of the annular sealing gasket provides a basic seal under the pressure of the wall, while the conical section enhances the seal under the thrust of the duct. If either sealing layer fails, the other layer can still maintain basic sound insulation performance.

[0011] To facilitate disassembly and fixing, the detachable fixing device includes a clamping arm assembly that is symmetrically fastened to the outer wall of the fixed air duct. The clamping arm assembly includes an upper clamping arm and a lower clamping arm. The first end of the upper clamping arm and the first end of the lower clamping arm are provided with a first bolt and can be locked by a first tightening nut. The end of the first bolt away from the first tightening nut is abutted against the wall or pre-embedded in the wall.

[0012] To increase the damping between the corresponding clamping arm and the fixed air duct and prevent axial sliding, the detachable fixing device also includes rubber pads embedded in the inner peripheral walls of the upper and lower clamping arms.

[0013] To ensure the secure installation of the rubber pad, the rubber pad has an I-shaped cross-section. The inner sides of the upper and lower clamping arms are provided with mounting grooves for the flange of the I-shaped rubber pad to be embedded in. The main body of the I-shaped rubber pad is in close contact with the outer wall of the fixed air duct.

[0014] Considering that the duct is prone to twisting around the axis when fixed with a single bolt, a second bolt is also provided on the upper or lower clamping arm, and can be locked by a second tightening nut. The end of the second bolt away from the second tightening nut is abutted against the wall or pre-embedded in the wall.

[0015] As an improvement, the detachable fixing device also includes a lateral locking mechanism located on the side of the fixed air duct, the lateral locking mechanism including a locking screw and a matching locking nut passing through the second end of the upper clamping arm and the second end of the lower clamping arm.

[0016] The technical solution adopted by this utility model to solve the second technical problem is: a working noise room, which adopts the above-mentioned installation structure of the working noise room air duct and the wall.

[0017] Compared with existing technologies, the advantages of this utility model are as follows: This utility model uses an axially clamping detachable fixing device to replace tape wrapping. Disassembly only requires loosening the clamping component to quickly separate the fixed duct from the wall, eliminating the tedious process of repeatedly wrapping / removing tape, significantly simplifying the operation process and shortening replacement time. The clamping force applied along the duct axis by the detachable fixing device directly resists the pull-out force generated by the corrugated pipe, with mechanical strength far exceeding the adhesive force of tape, effectively preventing duct loosening. The conical limiting cylinder on the back side of the wall precisely matches the conical port at the end of the fixed duct. The conical surface fit not only provides radial support, ensuring duct concentricity, but also converts part of the axial tension into radial clamping force, forming a self-reinforcing effect, greatly improving connection rigidity and sealing, and preventing airflow backflow. In particular, the standardized design of the conical port and the limiting cylinder, along with reliable axial clamping, ensures that the position, angle, and tightening state are highly consistent each time, eliminating random errors caused by tape wrapping, providing stable and repeatable boundary conditions for noise testing, thereby improving the accuracy and comparability of test data. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the installation structure of the air duct and wall in the working noise room according to an embodiment of this utility model;

[0019] Figure 2 This is a three-dimensional structural diagram of the installation structure of the air duct and wall in the working noise room according to another embodiment of the present utility model.

[0020] Figure 3 This is an exploded view of the installation structure of the air duct and wall in the working noise room according to an embodiment of this utility model;

[0021] Figure 4 This is a sectional perspective view of the installation structure of the working noise room air duct and wall in an embodiment of the present invention, cut along the axial direction of the fixed air duct.

[0022] Figure 5 This is a three-dimensional structural diagram of the detachable fixing device according to an embodiment of the present utility model;

[0023] Figure 6 This is a three-dimensional structural diagram of the detachable fixing device according to an embodiment of the present utility model, with the upper and lower clamping arms opened at a certain angle. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0026] Figures 1-6 This illustration shows a preferred embodiment of the installation structure of the ductwork for a noise-generating room according to the present invention. This embodiment provides an installation structure of the ductwork for a noise-generating room and a wall 10, including a fixed duct 20 passing through a through-hole in the wall 10. The end of the fixed duct 20 is machined into a tapered port 21 (preferably with a tapered angle of 15°-30°) that gradually narrows along the airflow direction. A tapered limiting cylinder 40 is installed on the side of the wall 10 facing away from the noise-generating room, and its tapered angle precisely matches the outer tapered surface of the tapered port 21 of the fixed duct 20. The fixed duct 20 is axially pressed against the wall 10 by a detachable fixing device, so that the tapered port 21 and the tapered limiting cylinder 40 form a tight fit.

[0027] See Figure 3The conical limiting cylinder 40 consists of a conical section 41 and an annular mounting part 42. The annular mounting part 42 can be fixed to the back of the wall 10 by bolts or by adhesive. The annular sealing gasket 50 is made of silicone rubber and includes corresponding conical sections 51 and annular sections 52. Specifically, during installation, the annular section 52 is pressed between the annular mounting part 42 of the conical limiting cylinder 40 and the side wall of the wall 10; the conical section 51 is embedded in the inner wall of the conical section 41 of the conical limiting cylinder 40. When the conical port 21 of the fixed duct 20 is inserted, it compresses the conical section 51 of the annular sealing gasket 50, causing radial compression deformation, automatically filling the conical surface gap, and eliminating the sound leakage channel.

[0028] The conical limiting cylinder 40 helps the operator position the fixed air duct 20 after replacement. This way, the operator only needs to press the fixed air duct 20 forward each time to fix it in a similar position, ensuring consistency of the testing environment. A sealing gasket is placed inside the conical limiting cylinder 40, which serves as a buffer layer to protect the air duct and prevents air leakage between the wall 10, the limiting cylinder, and the air duct.

[0029] See Figure 5 and Figure 6 The detachable fixing device includes a clamping arm assembly 30, which comprises an upper clamping arm 31 and a lower clamping arm 32. The two clamping arms are symmetrically fastened to the outer wall of the fixed duct 20, and I-shaped rubber pads 35 are embedded in the inner sides of the two clamping arms. Specifically, mounting grooves 300 are formed on the inner sides of the two clamping arms, and the flanges 351 of the I-shaped rubber pads 35 are inserted into the grooves for fixation. The main body of the rubber pad 35 is in close contact with the outer wall of the duct, increasing frictional damping and preventing rigid contact between the duct and the clamping arms, thus dispersing stress and preventing damage to the duct. The I-shaped structure ensures the fixation of the rubber pad 35 to the upper and lower clamping arms 32, preventing the rubber pad 35 from falling off with the duct.

[0030] One end of the upper clamping arm 31 is provided with an outwardly protruding first lug 311, and one end of the lower clamping arm 32 is provided with an outwardly protruding second lug 321. The first lug 311 and the second lug 321 can overlap and are connected by a first bolt 331. A first tightening nut 332 is connected to the outer end of the first bolt 331, that is, the first lug 311 and the second lug 321 can be locked by the first tightening nut 332. The end of the first bolt 331 away from the first tightening nut 332 abuts against the wall 10 or is embedded in the wall 10. In a preferred embodiment, the first bolt 331 adopts an expansion bolt structure and is embedded in the wall 10.

[0031] Considering that the duct is prone to twisting around its axis when fixed with a single bolt, a second bolt 341 is also provided on the upper clamping arm 31 or the lower clamping arm 32, and can be locked by a second tightening nut 342. The end of the second bolt 341 away from the second tightening nut 342 abuts against the wall 10 or is pre-embedded in the wall 10. Figure 5 As shown, the upper clamping arm 31 has a third protruding lug 313 protruding outward. The outer end of the second bolt 341 passes through the third protruding lug 313 and is fixed by the second tightening nut 342. The end of the second bolt 341 away from the second tightening nut 342 preferably adopts an expansion bolt structure and is embedded in the wall 10.

[0032] The second end of the upper clamping arm 31 and the second end of the lower clamping arm 32 are respectively provided with a first clamping plate 312 and a second clamping plate 322. After the first clamping plate 312 and the second clamping plate 322 are engaged, they are locked by a lateral locking mechanism. Specifically, the lateral locking mechanism includes a locking screw 361 and a locking nut 362. After the locking screw 361 passes through the first clamping plate 312 and the second clamping plate 322, it is locked by tightening the nut, thereby further tightening and fixing the air duct 20 by the upper and lower clamping arms 32.

[0033] This embodiment also designs a working noise room, which adopts the above-mentioned installation structure of the working noise room duct and the wall 10.

[0034] This embodiment uses a detachable, axially clamped fixing device instead of tape wrapping. Disassembly simply requires loosening the clamping component to quickly separate the fixed duct 20 from the wall 10, eliminating the tedious process of repeatedly wrapping and removing tape, significantly simplifying the operation and shortening replacement time. The clamping force applied along the duct's axial direction by the detachable fixing device directly resists the pull-out force generated by the corrugated pipe, with mechanical strength far exceeding the adhesive force of tape, effectively preventing the duct from loosening. The conical limiting cylinder 40 on the back side of the wall 10 precisely matches the conical port 21 at the end of the fixed duct 20. This conical fit not only provides radial support, ensuring duct concentricity, but also converts some axial tension into radial clamping force, creating a self-reinforcing effect, greatly improving connection rigidity and sealing, and preventing airflow backflow. In particular, the standardized design of the tapered port 21 and the limiting cylinder, along with reliable axial clamping, ensures that the position, angle, and tightening state are highly consistent with each installation, eliminating random errors caused by tape wrapping. This provides stable and repeatable boundary conditions for noise testing, thereby improving the accuracy and comparability of test data.

Claims

1. An installation structure for a working noise room duct and wall, comprising a fixed duct (20) passing through a through hole in the wall (10), characterized in that: The fixed air duct (20) has a tapered port (21) with a gradually decreasing diameter along the airflow direction at its end. The fixed air duct (20) is pressed and fixed to the wall (10) along the axial direction of the fixed air duct (20) by a detachable fixing device. A tapered limiting cylinder (40) is provided on the side of the wall (10) facing away from the working noise room to form a limiting support for the tapered port (21) of the fixed air duct (20). The taper of the tapered limiting cylinder (40) matches the outer tapered surface of the tapered port (21) of the fixed air duct (20).

2. The installation structure of the ventilation duct and wall for a working noise room according to claim 1, characterized in that: The inner wall of the conical limiting cylinder (40) is fitted with an annular sealing gasket (50). The conical port (21) of the fixed air duct (20) passes through the wall (10) through hole from one side of the working noise room and presses the annular sealing gasket (50) to achieve radial compression deformation of the annular sealing gasket (50) to achieve sealing.

3. The installation structure of the ventilation duct and wall for a working noise room according to claim 2, characterized in that: The conical limiting cylinder (40) includes a conical section (41) and an annular mounting part (42) extending radially outward from the large port of the conical section (41). The annular mounting part (42) is fixedly connected to the side of the wall (10) facing away from the working noise room.

4. The installation structure of the ventilation duct and wall for a working noise room according to claim 3, characterized in that: The annular sealing gasket (50) includes a conical segment (51) and an annular segment (52) extending radially outward from the large port of the conical segment (51). The annular segment (52) of the annular sealing gasket (50) is pressed between the annular mounting portion (42) of the conical limiting cylinder (40) and the side wall of the wall (10). The conical segment (51) of the annular sealing gasket (50) is pressed between the conical section (41) of the conical limiting cylinder (40) and the outer conical surface of the conical port (21) of the fixed air duct (20).

5. The installation structure of the ventilation duct and wall for a working noise room according to any one of claims 1 to 4, characterized in that: The detachable fixing device includes a clamping arm assembly (30) symmetrically fastened to the outer wall of the fixed air duct (20). The clamping arm assembly (30) includes an upper clamping arm (31) and a lower clamping arm (32). The first end of the upper clamping arm (31) and the first end of the lower clamping arm (32) are provided with a first bolt (331) and can be locked by a first tightening nut (332). The end of the first bolt (331) away from the first tightening nut (332) abuts against the wall (10) or is embedded in the wall (10).

6. The installation structure of the ventilation duct and wall for a working noise room according to claim 5, characterized in that: The detachable fixing device also includes a rubber pad (35) embedded in the inner peripheral walls of the upper clamping arm (31) and the lower clamping arm (32).

7. The installation structure of the ventilation duct and wall for a working noise room according to claim 6, characterized in that: The cross-section of the rubber pad (35) is an I-shaped cross-section. The inner sides of the upper clamping arm (31) and the lower clamping arm (32) are provided with mounting grooves (300) for the flange (351) of the I-shaped rubber pad (35) to be embedded therein. The main body of the I-shaped rubber pad (35) is in close contact with the outer wall of the fixed air duct (20).

8. The installation structure of the ventilation duct and wall for a working noise room according to claim 5, characterized in that: The upper clamping arm (31) or lower clamping arm (32) is also provided with a second bolt (341) and can be locked by a second tightening nut (342). The end of the second bolt (341) away from the second tightening nut (342) abuts against the wall (10) or is embedded in the wall (10).

9. The installation structure of the ventilation duct and wall for a working noise room according to claim 5, characterized in that: The detachable fixing device also includes a lateral locking mechanism located on the side of the fixed air duct (20). The lateral locking mechanism includes a locking screw (361) passing through the second end of the upper clamping arm (31) and the second end of the lower clamping arm (32) and a matching locking nut (362).

10. A noise-generating workroom, characterized in that: The installation structure of the working noise room duct and wall is adopted according to any one of claims 1 to 9.

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