Rotary mute air outlet device

Abstract

The invention discloses a rotary type mute air outlet device which comprises a butt joint pipe installed at an air outlet of a fresh air system, a limiting buffer mechanism located on one side of the butt joint pipe, a noise reduction channel installed at one end of the butt joint pipe and arranged between the butt joint pipe and the noise reduction channel, and an exhaust mechanism. The exhaust mechanism is arranged on one side of the noise reduction channel, and the flow dividing pipe is arranged in the noise reduction channel and used for guiding out part of airflow; compared with the prior art, when airflow enters the interior of the noise reduction channel, under the blocking effect of the air blocking ring, the airflow can be guided into a gap of the air blocking ring in cooperation with a buffer plate, part of the airflow is guided out along an exhaust hole, and the airflow can be exhausted from the sub airflow channels; the noise generated by airflow speed change due to the fact that internal airflow enters a narrow pipeline can be reduced, and therefore it is guaranteed that the decibel of the air outlet device is low in the using process.

Description

Technical Field

[0001] The invention relates to the technical field of fresh air, and in particular to a rotary silent air outlet device. Background Art

[0002] The air outlet is a commonly used structure in fresh air systems and air-conditioning systems, and is usually installed on the ceiling or wall.

[0003] The existing air outlet structure is usually simple in structure and only serves to disperse the air without other functions. Moreover, after the air is discharged from the air outlet and passes through the fan, the circulation speed of the air is accelerated. This part of the air will rub against each other during circulation and produce certain noise. The flow channel of the air circulation will also cause noise under the action of high-speed airflow, and at the same time, it will be transmitted to the air outlet device and cause it to vibrate. Noise is also a kind of environmental pollution, which seriously affects people's lives. For this reason, we propose a rotary silent air outlet device to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a rotary silent air outlet device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a rotary silent air outlet device, comprising:

[0006] A butt joint pipe, which is installed at the air outlet of the fresh air system;

[0007] A limit buffer mechanism, which is located on one side of the butt joint and plays a role in assisting installation and reducing noise;

[0008] A noise reduction channel, wherein the noise reduction channel is installed at one end of the butt joint pipe, and the limit buffer mechanism is arranged between the butt joint pipe and the noise reduction channel, which can reduce the occurrence of air leakage and the like;

[0009] An exhaust mechanism is arranged on one side of the noise reduction channel, and the exhaust mechanism can block dust and reduce the internal dust from being discharged into the room through the air outlet during long-term use;

[0010] A shunt pipe is arranged inside the noise reduction channel. The shunt pipe is used to guide out part of the airflow to reduce the noise during operation. When the air outlet device is needed, it can be installed at the air outlet of the fresh air system. As the airflow enters the equipment, it can be separated and discharged inside the noise reduction channel under the action of the shunt pipe to reduce the noise caused by the excessive flow rate of the internal airflow. Under the action of the exhaust mechanism, it can play a screening role. Since the maintenance time of the fresh air duct is relatively long, the dust inside it can be reduced from entering the room along the airflow, and the limit buffer mechanism can play a sealing role to avoid air leakage at the connection of the air outlet device, and can also increase the stability of the air outlet device itself to avoid vibration.

[0011] Preferably, the position-limiting buffer mechanism is clamped on one side of the noise reduction channel, and the position-limiting buffer mechanism comprises a plurality of positioning plates, the positioning plates are arranged in a ring array on one side of the noise reduction channel which is conical, and the positioning plates are clamped with a plurality of docking grooves;

[0012] A guide pipe is installed at one end of the butt joint pipe. The guide pipe is in a truncated cone shape. A plurality of welding plates are installed on the arc-shaped outer wall of the guide pipe. The positioning plate is installed on the welding plate. The positioning plates are arranged in a uniform array between the noise reduction channel and the guide pipe.

[0013] Preferably, a pair of elastic rings are installed between the positioning plates, and the pair of elastic rings are respectively installed on the inside of the two ends of the positioning plates. A plurality of buffer blocks are clamped between the elastic rings. After the elastic rings are installed, the buffer blocks can be squeezed, and the buffer blocks can fit at the connection between the guide pipe and the noise reduction channel.

[0014] Preferably, a plurality of arcuate grooves are provided on the surface of the noise reduction channel, and the arcuate grooves are arranged in a uniform array on the outer wall of the noise reduction channel. A plurality of sub-airflow channels are installed on the noise reduction channel, and the sub-airflow channels are arc-shaped and communicate with the arcuate grooves.

[0015] Preferably, the exhaust mechanism comprises a sealing cover and a clamping ring, the sealing cover is installed at one end of the noise reduction channel, a plurality of annular guide plates are arranged inside the sealing cover, and the sealing cover is used to assist in guiding the flow;

[0016] The clamping ring is arranged at the top of the inner wall of the noise reduction channel, a dust shield is installed on the clamping ring, the dust shield is annular, a fixed shaft is installed on the inner wall of the clamping ring, and a rotating ring is rotatably arranged on the fixed shaft.

[0017] Preferably, a plurality of fixed blades are installed on the surface of the rotating ring, a rubber ring is installed between the fixed blades, the rubber ring is elastic, a connecting plate is clamped at one end of the fixed blade, a dust collecting groove is provided on the connecting plate, a plurality of inclined grooves are opened on the connecting plate, and the inclined grooves are connected with the dust collecting groove, and a buffer ball is installed on the top of the connecting plate.

[0018] Preferably, a plurality of wind shielding rings are installed inside the diverter pipe, the wind shielding rings are arranged obliquely, a plurality of exhaust holes are opened on the diverter pipe, and the exhaust holes are located between the wind shielding rings, and the positions of the wind shielding holes on the surface of the diverter pipe correspond to the sub-airflow channels.

[0019] Preferably, a support ring is provided on one side of the diverter pipe, and the support ring is clamped inside the noise reduction channel. A buffer baffle ring is installed on the inner wall of the support ring, and the buffer baffle ring is elastic. A plurality of positioning plates are installed on the buffer baffle ring, and a silencer shaft is installed on the positioning plate. A buffer plate is installed on one side of the silencer shaft, and the buffer plate has an arc. A plurality of arc grooves are opened on the wind shield ring, and the buffer plate is inserted inside the arc groove for guiding airflow, so as to discharge part of the airflow to reduce the noise caused by the accelerated circulation speed.

[0020] Preferably, a plurality of mounting plates are installed on the side walls of the butt-jointed tubes, gaps are provided inside the mounting plates, and sound insulation cotton is inserted in the gaps.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. When the airflow enters the noise reduction channel through the present invention, under the blocking effect of the wind shield ring, the buffer plate can be used to guide the airflow into the gap of the wind shield ring, and part of the airflow can be guided out along the exhaust hole, so that it can be discharged from the sub-airflow channel, which can reduce the noise generated by the change of airflow speed caused by the internal airflow entering the narrow pipe, thereby ensuring that the decibel of the air outlet device is low during use, and will not affect normal life and rest;

[0023] 2. After the installation is completed through the limit buffer mechanism of the present invention, the buffer block can be staggered and squeezed under the action of the elastic ring, so that it can deform itself and fit at the connection of the butt pipe and the noise reduction channel, which can reduce the noise generated by the vibration of the connection, ensure the stability of the equipment itself, and avoid the loosening of the installation parts after long-term use;

[0024] 3. The outlet position of the sub-airflow channel of the present invention can also be adjusted to deliver air from different directions, thereby rapidly cooling the room, and avoiding the situation where the airflow is delivered in a single direction when there is only a single air outlet;

[0025] 4. The present invention can make the rotating ring rotate under the action of airflow. As the fixed fan blades move in a circular motion, the airflow can pass through the inclined grooves on the surface of the connecting plate, and can accumulate part of the dust and impurities in the collecting groove, which can adsorb dust and prevent it from entering the room along the airflow. As the airflow passes through the dust shield, the dust and impurities can be further separated, reducing the flying of indoor dust and reducing the impact on personnel health. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the butt-joint connection of the present invention;

[0028] Figure 3 It is a schematic diagram of the local structure of the limit buffer mechanism of the present invention;

[0029] Figure 4 This is a schematic diagram of the internal structure of the noise reduction channel of the present invention;

[0030] Figure 5 It is a schematic diagram of the local structure of the rotating ring of the present invention;

[0031] Figure 6 It is a schematic diagram of the local structure of the support ring of the present invention;

[0032] Figure 7 This is a schematic diagram of the shunt pipe structure of the present invention;

[0033] In the figure: 1. butt joint; 2. limit buffer mechanism; 3. noise reduction channel; 4. exhaust mechanism; 5. shunt pipe; 11. mounting plate; 12. guide pipe; 21. positioning plate; 22. elastic ring; 23. buffer block; 31. sub-air flow channel; 41. sealing cover; 42. snap ring; 421. dust shield plate; 43. rotating ring; 44. fixed fan blade; 441. rubber ring; 45. connecting plug plate; 451. buffer ball; 51. support ring; 52. wind shield ring; 53. silencer shaft; 531. positioning plate; 54. buffer plate; 55. buffer baffle ring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 7The present invention provides a technical solution: a rotary silent air outlet device, comprising:

[0036] Butt joint pipe 1, which is installed at the air outlet of the fresh air system;

[0037] The limit buffer mechanism 2 is located at one side of the butt joint 1, and plays a role in assisting installation and reducing noise;

[0038] The noise reduction channel 3 is installed at one end of the butt joint pipe 1, and the limit buffer mechanism 2 is arranged between the butt joint pipe 1 and the noise reduction channel 3, which can reduce the occurrence of air leakage and the like;

[0039] The exhaust mechanism 4 is arranged on one side of the noise reduction channel 3. The exhaust mechanism 4 can block dust and reduce the internal dust from being discharged into the room through the air outlet after long-term use.

[0040] The shunt pipe 5 is arranged inside the noise reduction channel 3. The shunt pipe 5 is used to guide out part of the airflow to reduce the noise during operation. When the air outlet device is needed, it can be installed at the air outlet of the fresh air system. As the airflow enters the interior of the equipment, it can be separated and discharged in part inside the noise reduction channel 3 under the action of the shunt pipe 5, so as to reduce the noise caused by the excessive internal airflow velocity. Under the action of the exhaust mechanism 4, it can play a screening role. Since the maintenance time of the fresh air duct is relatively long, the dust inside it can be reduced from entering the room along the airflow, and the limit buffer mechanism 2 can play a sealing role to avoid air leakage at the connection of the air outlet device, and can also increase the stability of the air outlet device itself to avoid vibration.

[0041] like Figure 2 As shown, in order to ensure the stability of the installation, the limit buffer mechanism 2 is clamped on one side of the noise reduction channel 3, and the limit buffer mechanism 2 includes a plurality of positioning plates 21, which are arranged in a ring array on one side of the noise reduction channel 3 in a conical shape, and a plurality of docking grooves are clamped on the positioning plates 21;

[0042] A guide pipe 12 is installed at one end of the docking pipe 1. The guide pipe 12 is in a truncated cone shape. A plurality of welding plates are installed on the arc-shaped outer wall of the guide pipe 12. The positioning plate 21 is installed on the welding plate. The positioning plates 21 are arranged in a uniform array between the noise reduction channel 3 and the guide pipe 12. The positioning plates 21 can be clamped on the welding plate. At the same time, the noise reduction channel 3 can be inserted into the guide pipe 12, and the installation and positioning are performed from both the inside and the outside to avoid unstable vibration during subsequent use.

[0043] like Figure 3As shown, in order to ensure the stability of the air outlet device itself and avoid noise due to vibration during use, a pair of elastic rings 22 are installed between the positioning plates 21. The pair of elastic rings 22 are respectively installed on the inside of the two ends of the positioning plates 21, and a plurality of buffer blocks 23 are clamped between the elastic rings 22. After the elastic rings 22 are installed, they can squeeze the buffer blocks 23, and the buffer blocks 23 can fit in the connection between the guide pipe 12 and the noise reduction channel 3. After the installation is completed, the elastic rings 22 can squeeze the buffer blocks 23 from both sides, so that they can be evenly laid at the connection between the guide pipe 12 and the noise reduction channel 3. While assisting in limiting, it can play a sealing role, which can reduce air leakage or dripping, and reduce the rust and premature aging of the connecting parts at the connection due to water seepage.

[0044] In order to reduce the noise generated by excessive flow rate during air flow transmission, a plurality of arc grooves are opened on the surface of the noise reduction channel 3, and the arc grooves are arranged in a uniform array on the outer wall of the noise reduction channel 3. A plurality of sub-air flow channels 31 are installed on the noise reduction channel 3. The sub-air flow channels 31 are arc-shaped and connected with the arc grooves. During air flow transmission, a part of the sub-air flow channels 31 can be discharged along the arc grooves under the action of the wind shield ring 52, which can effectively slow down the flow of air flow inside the noise reduction channel 3 and reduce the noise during the use of the air outlet device. The position of the sub-air flow channel 31 can be adjusted according to different rooms, so that the air flow can quickly cool down the room from multiple directions, and the situation that the air flow has a single direction when there is only a single air outlet, resulting in poor cooling effect, can be avoided.

[0045] like Figure 4 As shown, in order to increase the temperature reduction range, the exhaust mechanism 4 includes a sealing cover 41 and a clamping ring 42. The sealing cover 41 is installed at one end of the noise reduction channel 3. A plurality of annular guide plates are arranged inside the sealing cover 41. The sealing cover 41 is used to assist in guiding the flow.

[0046] A clamping ring 42 is arranged at the top of the inner wall of the noise reduction channel 3, and a dust shield plate 421 is installed on the clamping ring 42. The dust shield plate 421 is annular, and a fixed shaft is installed on the inner wall of the clamping ring 42. A rotating ring 43 is rotatably provided on the fixed shaft, which can quickly transport the airflow into the room under the action of the annular guide plate, thereby improving the cooling efficiency of the equipment.

[0047] like Figure 5As shown, in order to reduce the impact of heavy dust from the fresh air system entering the room and causing harm to human health, a plurality of fixed blades 44 are installed on the surface of the rotating ring 43, and a rubber ring 441 is installed between the fixed blades 44. The rubber ring 441 is elastic, and a connecting plug plate 45 is clamped at one end of the fixed blade 44, and a dust collecting groove is provided on the connecting plug plate 45. A plurality of inclined grooves are opened on the connecting plug plate 45, and the inclined grooves are connected with the dust collecting groove. A buffer ball 451 is installed on the top of the connecting plug plate 45. In order to play a dust reduction role, the fixed blades 44 can make the airflow pass through the inclined grooves during the circular motion, leaving part of the dust and impurities inside in the dust collecting grooves, so as to facilitate subsequent unified treatment. At the same time, under the action of the dust shield 421, the dust and impurities are further separated, and the dust can be screened multiple times to prevent dust and impurities from entering the room along the airflow and affecting people's health.

[0048] like Figure 6 As shown, in order to reduce the noise of the equipment during use, a plurality of wind shield rings 52 are installed inside the diverter pipe 5, and the wind shield rings 52 are arranged at an angle. A plurality of exhaust holes are opened on the diverter pipe 5, and the exhaust holes are located between the wind shield rings 52. The positions of the wind shield holes on the surface of the diverter pipe 5 correspond to the sub-airflow channels 31. The airflow entering the noise reduction channel 3 can be gradually diverted along the wind shield rings 52, and a part of the airflow can be guided out under the action of the diverter pipe 5, which can reduce the flow rate of the airflow inside the diverter pipe 5 and effectively reduce the noise of the air outlet device.

[0049] like Figure 7 As shown, a support ring 51 is provided on one side of the diverter pipe 5, and the support ring 51 is clamped in the noise reduction channel 3. A buffer baffle ring 55 is installed on the inner wall of the support ring 51. The buffer baffle ring 55 is elastic. A plurality of positioning plates 531 are installed on the buffer baffle ring 55. A silencer shaft 53 is installed on the positioning plate 531. A buffer plate 54 is installed on one side of the silencer shaft 53. The buffer plate 54 has an arc. A plurality of arc grooves are opened on the wind shield ring 52. The buffer plate 54 is inserted in the arc groove for airflow guidance. The exhaust part of the airflow reduces the noise caused by the accelerated circulation speed. Under the guiding effect of the buffer plate 54, more airflow can be guided out and discharged along the sub-airflow channel 31, so as to play a noise reduction role. In addition, the support ring 51 can be against one side of the clamping ring 42 under the action of the silencer shaft 53, so as to play a buffering role, reduce the vibration of the exhaust mechanism 4 caused by the airflow during use, and control the noise during the exhaust process.

[0050] In order to reduce the impact on rest, multiple mounting plates 11 are installed on the side wall of the butt pipe 1. A gap is provided inside the mounting plate 11, and sound insulation cotton is inserted in the gap. The sound insulation cotton can reduce noise and reduce the noise generated by the vibration of the equipment during operation.

[0051] Working principle: first, when the air outlet device is needed, it can be installed at the air outlet of the fresh air system. As the airflow enters the interior of the device, it can be partially discharged under the action of the diverter pipe 5 inside the noise reduction channel 3, thereby reducing the noise caused by the excessive internal airflow velocity. Under the action of the exhaust mechanism 4, it can play a screening role. Since the maintenance time of the fresh air duct is relatively long, the dust inside it can be reduced from entering the room along the airflow. The position-limiting buffer mechanism 2 can play a sealing role to avoid air leakage at the connection of the air outlet device, and can also increase the stability of the air outlet device itself to avoid vibration. After the position-limiting buffer mechanism 2 is installed, the buffer block 23 can be staggered and squeezed under the action of the elastic ring 22, so that it can deform itself and fit at the connection of the butt pipe 1 and the noise reduction channel 3, thereby reducing the noise caused by its own vibration at the connection.

[0052] Then, when the airflow enters the noise reduction channel 3, the airflow can be blocked by the wind shield ring 52 and cooperate with the buffer plate 54 to lead part of the airflow through the gap of the wind shield ring 52, so that it can be discharged from the sub-airflow channel 31, thereby reducing the noise generated by the change of airflow velocity caused by the internal airflow entering the narrow pipe, and the air outlet position of the sub-airflow channel 31 can also be adjusted to transport air from different directions, so as to quickly cool the room and reduce the situation where the airflow is transported in a single direction;

[0053] Finally, under the action of the airflow, the rotating ring 43 can rotate. As the fixed fan blades 44 move in a circular motion, the airflow can pass through the inclined groove on the surface of the connecting plate 45, and some dust and impurities can be accumulated in the collecting groove, which can adsorb dust and prevent them from entering the room along the airflow. As the airflow can pass through the dust shield 421, the dust and impurities can be further separated, reducing the flying of dust in the room and reducing the impact on personnel health. The silent shaft 53 can be against one side of the buffer baffle ring 55, so that the support ring 51 and the clamping ring 42 are against each other, playing a buffering role, which can reduce the noise caused by vibration generated during the exhaust process.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotary silent air outlet device, characterized in that: include, A butt joint pipe (1), wherein the butt joint pipe (1) is installed at the air outlet of the fresh air system; A position limiting buffer mechanism (2), the position limiting buffer mechanism (2) being located on one side of the butt joint (1), and the position limiting buffer mechanism (2) plays a role in assisting installation and reducing noise; A noise reduction channel (3), wherein the noise reduction channel (3) is installed at one end of the butt joint pipe (1), and the position limiting buffer mechanism (2) is arranged between the butt joint pipe (1) and the noise reduction channel (3), so as to reduce the occurrence of air leakage and the like; An exhaust mechanism (4), the exhaust mechanism (4) being arranged on one side of the noise reduction channel (3), the exhaust mechanism (4) being able to block dust and reduce the amount of internal dust discharged into the room through the air outlet during long-term use; A shunt pipe (5), wherein the shunt pipe (5) is arranged inside the noise reduction channel (3), and the shunt pipe (5) is used to guide part of the airflow to reduce noise during operation.

2. The rotary silent air outlet device according to claim 1, characterized in that: The position-limiting buffer mechanism (2) is clamped on one side of the noise reduction channel (3), and the position-limiting buffer mechanism (2) comprises a plurality of positioning plates (21). The positioning plates (21) are arranged in a ring array on one side of the noise reduction channel (3) in a conical shape, and the positioning plates (21) are clamped with a plurality of docking grooves; A flow guide pipe (12) is installed at one end of the butt joint pipe (1), the flow guide pipe (12) is in a truncated cone shape, a plurality of welding plates are installed on the arc-shaped outer wall of the flow guide pipe (12), the positioning plate (21) is installed on the welding plate, and the positioning plates (21) are arranged in a uniform array between the noise reduction channel (3) and the flow guide pipe (12).

3. The rotary silent air outlet device according to claim 2, characterized in that: A pair of elastic rings (22) are installed between the positioning plates (21), and the pair of elastic rings (22) are respectively installed on the inside of the two ends of the positioning plates (21). A plurality of buffer blocks (23) are clamped between the elastic rings (22). After the elastic rings (22) are installed, they can press the buffer blocks (23), and the buffer blocks (23) can fit at the connection between the guide pipe (12) and the noise reduction channel (3).

4. The rotary silent air outlet device according to claim 1, characterized in that: A plurality of arcuate grooves are provided on the surface of the noise reduction channel (3), and the arcuate grooves are arranged in a uniform array on the outer wall of the noise reduction channel (3). A plurality of sub-airflow channels (31) are installed on the noise reduction channel (3), and the sub-airflow channels (31) are arcuate and communicate with the arcuate grooves.

5. The rotary silent air outlet device according to claim 1, characterized in that: The exhaust mechanism (4) comprises a sealing cover (41) and a clamping ring (42); the sealing cover (41) is installed at one end of the noise reduction channel (3); a plurality of annular guide plates are arranged inside the sealing cover (41); and the sealing cover (41) is used to assist in guiding the flow; The clamping ring (42) is arranged at the top end of the inner wall of the noise reduction channel (3); a dust shield (421) is mounted on the clamping ring (42); the dust shield (421) is annular; a fixed shaft is mounted on the inner wall of the clamping ring (42); and a rotating ring (43) is rotatably mounted on the fixed shaft.

6. The rotary silent air outlet device according to claim 5, characterized in that: A plurality of fixed blades (44) are mounted on the surface of the rotating ring (43), a rubber ring (441) is mounted between the fixed blades (44), and the rubber ring (441) is elastic; a connecting plug plate (45) is clamped at one end of the fixed blade (44), a dust collecting groove is provided on the connecting plug plate (45), a plurality of inclined grooves are opened on the connecting plug plate (45), and the inclined grooves are connected with the dust collecting grooves, and a buffer ball (451) is mounted on the top of the connecting plug plate (45).

7. The rotary silent air outlet device according to claim 4, characterized in that: A plurality of wind shielding rings (52) are installed inside the diverter pipe (5), and the wind shielding rings (52) are arranged in an inclined manner. A plurality of exhaust holes are opened on the diverter pipe (5), and the exhaust holes are located between the wind shielding rings (52). The positions of the wind shielding holes on the surface of the diverter pipe (5) correspond to the sub-airflow channels (31).

8. The rotary silent air outlet device according to claim 7, characterized in that: A support ring (51) is provided on one side of the shunt pipe (5), and the support ring (51) is clamped inside the noise reduction channel (3). A buffer baffle ring (55) is installed on the inner wall of the support ring (51), and the buffer baffle ring (55) is elastic. A plurality of positioning plates (531) are installed on the buffer baffle ring (55), and a silencer shaft (53) is installed on the positioning plate (531). A buffer plate (54) is installed on one side of the silencer shaft (53), and the buffer plate (54) has an arc. A plurality of arc grooves are opened on the wind shield ring (52), and the buffer plate (54) is inserted inside the arc grooves for guiding airflow, so that the noise caused by the accelerated circulation speed of the discharged part of the airflow is reduced.

9. The rotary silent air outlet device according to claim 1, characterized in that: A plurality of mounting plates (11) are mounted on the side wall of the butt-jointed pipe (1), a gap is provided inside the mounting plate (11), and sound insulation cotton is inserted into the gap.

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