Active noise elimination exhaust pipeline

Abstract

The utility model discloses an active noise elimination exhaust duct which comprises an exhaust duct body, the inner wall of the exhaust duct body is fixedly connected with sound absorption cotton, the inner wall of the exhaust duct body is fixedly connected with a limiting frame, the left side face of the limiting frame is fixedly connected with a buffer pad, a silencer is arranged in the exhaust duct body, and the inner wall of the exhaust duct body is fixedly connected with the buffer pad. Connecting plates are arranged on the two sides of the silencer, two sliding rods are fixedly connected to the side faces, close to each other, of the two connecting plates, and two sets of sliding holes are formed in the outer surface of the silencer. According to the device, the variable-diameter pipe body with the increased diameter is arranged at the air exhaust end of the air exhaust pipeline, the silencer is arranged in the variable-diameter pipe body, the silencing effect of the air exhaust pipeline can be greatly improved through cooperation of the silencer and the sound absorption cotton, the silencer is matched with the connecting plate through the reset spring and the sliding rod, the connecting plate is clamped in the air exhaust pipe body, and therefore the silencing effect of the air exhaust pipeline is greatly improved. Compared with traditional screw installation, in the exhaust using process, the silencer cannot generate noise due to loosening of screws.

Description

Technical Field

[0001] The utility model relates to the field of exhaust ducts, in particular to an exhaust duct with active noise reduction. Background Art

[0002] Exhaust ducts are pipe systems used to discharge waste gas, smoke, steam or harmful gases generated in buildings, equipment or industrial processes. They are usually connected to the exhaust system, and the exhaust gas is extracted from the room or equipment through a fan or other equipment and discharged to the outdoors or a treatment facility. The exhaust duct can be made of various materials, such as metal, plastic or composite materials. When the gas flows in the air flow channel of the aerodynamic equipment, it will be mixed with the noise of the equipment or form wind noise during the flow process. When the airflow reaches a certain flow rate, it will form a relatively large noise, which will affect the surrounding environment and the normal life of indoor personnel. At present, in order to improve the problem of large noise during the operation of the exhaust duct, an active silencer is usually installed in the exhaust duct to reduce noise.

[0003] According to Chinese patent number CN220470972U, an active silencer exhaust duct is disclosed, including a duct body, one end of the duct body is provided with a reducing section with a gradually increasing inner diameter, an active silencer is provided in the reducing section, and a connecting mechanism is provided on the reducing section. When the reducing section is sleeved on the duct body, the connecting mechanism is used to connect the reducing section with the duct body. In the above patent scheme, when the active silencer is connected, it is still necessary to use screws to fix the silencer. If the screws become loose during use, the noise of the exhaust duct will increase, resulting in inconvenience in use. For this reason, we propose an active silencer exhaust duct to solve the above problem. Utility Model Content

[0004] The purpose of the utility model is to provide an active noise-absorbing exhaust duct to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An active silencer exhaust duct comprises an exhaust duct body, the inner wall of the exhaust duct body is fixedly connected with sound-absorbing cotton, the inner wall of the exhaust duct body is fixedly connected with a limiting frame, the left side of the limiting frame is fixedly connected with a buffer pad, a muffler is arranged inside the exhaust duct body, connecting plates are arranged on both sides of the muffler, two sliding rods are fixedly connected to the side surfaces of the two connecting plates close to each other, two groups of sliding holes are opened on the outer surface of the muffler, the ends of the two groups of sliding rods close to each other pass through the sliding holes and extend to the inside of the muffler, and a return spring is sleeved on the outer surface of each of the sliding rods.

[0007] In a further embodiment, a side surface of the two connecting plates that are away from each other is fixedly connected with an anti-slip pad, and a side surface of the two connecting plates is fixedly connected with a mounting handle.

[0008] In a further embodiment, the ends of the two groups of return springs that are away from each other are connected to the connecting plate, and the ends of the two groups of return springs that are close to each other are connected to the outer surface of the muffler.

[0009] In a further embodiment, a grille is provided on the left end of the exhaust pipe body, and openings arranged at equal distances are provided on one side of the grille.

[0010] In a further embodiment, a fixing hoop is fixedly connected to the outer surface of the exhaust pipe body, and two mounting screw holes are provided on the upper surface and the bottom surface of the fixing hoop.

[0011] In a further embodiment, the right side surface of the muffler is in contact with the buffer pad, and the side surfaces of the two connecting plates that are away from each other are in contact with the sound-absorbing cotton on the inner wall of the exhaust pipe body.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The device arranges sound-absorbing cotton on the inner wall of the exhaust duct, utilizes many small gaps between the sound-absorbing cotton fibers to absorb sound inside the exhaust duct, thereby achieving the effect of silencing the exhaust duct, arranges a reducer body with an increased diameter at the exhaust end of the exhaust duct, and arranges a muffler inside the reducer body, and the cooperation of the muffler and the sound-absorbing cotton can greatly improve the silencing effect of the exhaust duct, and the muffler cooperates with the connecting plate through a reset spring and a sliding rod, so that the connecting plate is stuck in the interior of the exhaust duct body. Compared with the traditional screw installation, the muffler will not generate noise due to the loosening of the screws during the exhaust use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the three-dimensional structure of the exhaust duct with active noise reduction.

[0015] Figure 2 It is a front cross-sectional view of the exhaust pipe body in the exhaust duct with active silencer.

[0016] Figure 3 It is a side cross-sectional view of the exhaust pipe body in the exhaust duct with active silencer.

[0017] Figure 4 A schematic diagram of the three-dimensional structure of a side view of a limit frame in an exhaust duct with active noise reduction.

[0018] In the figure: 1. Exhaust pipe body; 2. Muffler; 3. Grille; 4. Fixing hoop; 5. Sliding hole; 6. Sound-absorbing cotton; 7. Mounting screw hole; 8. Through hole; 9. Reset spring; 10. Connecting plate; 11. Anti-slip pad; 12. Limiting frame; 13. Buffer pad; 14. Sliding rod; 15. Mounting handle. DETAILED DESCRIPTION

[0019] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-4In the utility model, an active sound-absorbing exhaust duct comprises an exhaust pipe body 1, and the inner wall of the exhaust pipe body 1 is fixedly connected with a sound-absorbing cotton 6, and the sound-absorbing cotton 6 is a kind of artificial inorganic fiber, which adopts natural minerals such as quartz sand, limestone, dolomite as the main raw materials, and is melted into glass with some chemical raw materials such as soda ash and borax. In the molten state, it is blown into flocculent fine fibers with the help of external force. The fibers are three-dimensionally crossed and entangled with each other, showing many small gaps. The inner wall of the exhaust pipe body 1 is fixedly connected with a limiting frame 12, and the limiting frame 12 can limit the muffler 2. The left side of the limiting frame 12 is fixedly connected with a buffer pad 13. The interior of the exhaust pipe body 1 is provided with a muffler 2, and the muffler 2 is an existing known technology. The specific muffler principle will not be repeated here. The muffler 2 Connecting plates 10 are provided on both sides, and two sliding rods 14 are fixedly connected to the side surfaces of the two connecting plates 10 that are close to each other. Two groups of sliding holes 5 are opened on the outer surface of the muffler 2, and the ends of the two groups of sliding rods 14 that are close to each other pass through the sliding holes 5 and extend to the inside of the muffler 2. A return spring 9 is sleeved on the outer surface of each sliding rod 14, and the muffler 2 is installed inside the reducing end of the exhaust pipe body 1. The mounting handles 15 on both sides of the muffler 2 are pulled to compress the return spring 9 of the connecting plate 10, and the connecting plate 10 and the muffler 2 are inserted into the exhaust pipe body 1, so that one end of the muffler 2 contacts with the buffer pad 13 on the limit frame 12, and the rebound effect of the return spring 9 is utilized to make the anti-slip pad 11 on the connecting plate 10 contact closely with the inner wall of the exhaust pipe body 1, and then the muffler 2 is installed inside the exhaust pipe body 1.

[0023] The side surfaces of the two connecting plates 10 that are away from each other are fixedly connected with anti-slip pads 11, and the side surfaces of the two connecting plates 10 are fixedly connected with mounting handles 15, which facilitate the installation of the muffler 2. The ends of the two sets of return springs 9 that are away from each other are connected to the connecting plate 10, and the ends of the two sets of return springs 9 that are close to each other are connected to the outer surface of the muffler 2. Through the rebound effect of the return springs 9, the muffler 2 can be limited inside the exhaust duct. The left end of the exhaust pipe body 1 is provided with a grille 3, and one side surface of the grille 3 is provided with openings 8 arranged at equal distances. The grille 3 protects the end of the exhaust pipe body 1 to prevent foreign matter from entering the muffler 2.

[0024] A fixing hoop 4 is fixedly connected to the outer surface of the exhaust pipe body 1, and two mounting screw holes 7 are provided on the upper surface and the bottom surface of the fixing hoop 4. By arranging the fixing hoop 4 on the outside of the exhaust pipe body 1, the mounting screw holes 7 on the fixing hoop 4 can be conveniently connected to the mounting bracket by screws. The right side of the muffler 2 is in contact with the buffer pad 13, and the side surfaces of the two connecting plates 10 that are away from each other are in contact with the sound-absorbing cotton 6 on the inner wall of the exhaust pipe body 1, and the exhaust pipe is silenced by the cooperation of the muffler 2 and the sound-absorbing cotton 6.

[0025] The working principle of the utility model is:

[0026] When in use, first connect the exhaust duct to the duct bracket through the fixing hoop 4 on the outside of the exhaust duct body 1, then install the muffler 2 inside the reducing end of the exhaust duct body 1, pull the installation handles 15 on both sides of the muffler 2 to make the connecting plate 10 compress the reset spring 9, insert the connecting plate 10 and the muffler 2 into the exhaust duct body 1, make one end of the muffler 2 contact with the buffer pad 13 on the limit frame 12, utilize the rebound effect of the reset spring 9 to make the anti-slip pad 11 on the connecting plate 10 closely contact with the inner wall of the exhaust duct body 1, and then install the muffler 2 inside the exhaust duct body 1, and the muffler 2 and the sound-absorbing cotton 6 cooperate to silence the exhaust duct.

[0027] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0028] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An active noise-reducing exhaust duct, characterized in that: The invention comprises an exhaust pipe body (1), the inner wall of which is fixedly connected with a sound-absorbing cotton (6), the inner wall of which is fixedly connected with a limiting frame (12), the left side of which is fixedly connected with a buffer pad (13), a muffler (2) is arranged inside the exhaust pipe body (1), connecting plates (10) are arranged on both sides of the muffler (2), two sliding rods (14) are fixedly connected to the sides of the two connecting plates (10) close to each other, two groups of sliding holes (5) are opened on the outer surface of the muffler (2), the ends of the two groups of sliding rods (14) close to each other pass through the sliding holes (5) and extend to the inside of the muffler (2), and the outer surface of each sliding rod (14) is sleeved with a return spring (9).

2. The active noise-reducing exhaust duct according to claim 1, characterized in that: The side surfaces of the two connecting plates (10) that are away from each other are both fixedly connected with anti-skid pads (11), and the side surfaces of the two connecting plates (10) are both fixedly connected with mounting handles (15).

3. The active noise-reducing exhaust duct according to claim 1, characterized in that: The ends of the two groups of return springs (9) that are away from each other are connected to the connecting plate (10), and the ends of the two groups of return springs (9) that are close to each other are connected to the outer surface of the muffler (2).

4. The active noise-reducing exhaust duct according to claim 1, characterized in that: The left end of the exhaust pipe body (1) is sleeved with a grille (3), and one side of the grille (3) is provided with openings (8) arranged at equal distances.

5. The active noise-reducing exhaust duct according to claim 1, characterized in that: A fixing hoop (4) is fixedly connected to the outer surface of the exhaust pipe body (1), and two mounting screw holes (7) are provided on the upper surface and the bottom surface of the fixing hoop (4).

6. The active noise-reducing exhaust duct according to claim 1, characterized in that: The right side surface of the muffler (2) is in contact with the buffer pad (13), and the side surfaces of the two connecting plates (10) that are away from each other are in contact with the sound-absorbing cotton (6) on the inner wall of the exhaust pipe body (1).

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