Air inlet silencer for mining local fan

Abstract

The utility model discloses an air inlet silencer used for a mining local fan, which comprises a steel shell box, a middle U-shaped silencing cabinet is fixedly arranged in the steel shell box, an inner U-shaped silencing cabinet is arranged in the middle U-shaped silencing cabinet, and an outer U-shaped silencing cabinet is arranged in the inner U-shaped silencing cabinet. A first transverse noise reduction plate and a first longitudinal noise reduction plate which are vertically connected in a staggered mode are arranged in the inner U-shaped noise reduction cabinet, a third longitudinal noise reduction plate is arranged between the steel shell box body and the middle U-shaped noise reduction cabinet at intervals, and a second longitudinal noise reduction plate is arranged between the middle U-shaped noise reduction cabinet and the inner U-shaped noise reduction cabinet at intervals. The lower end of the middle U-shaped silencing cabinet is connected with the first horizontal silencing plate, the lower end of the inner U-shaped silencing cabinet is connected with the second horizontal silencing plate, and an air channel at the lower end of the air inlet silencer is connected with the first-stage silencer through the third air inlet. Therefore, the noise generated by the mining local fan can be reduced and can be reduced to be below 70 decibels.

Description

Technical Field

[0001] The utility model relates to a noise reduction structure for a mining ventilator, in particular to an air inlet noise reduction device for a mining explosion-proof press-in type counter-rotating axial flow local ventilator. Background Art

[0002] The local ventilation fan for mines is an important and indispensable equipment for ventilation and gas emission of mining working faces in mines. It undertakes the important tasks of providing fresh air flow for the working face, exhausting harmful gases and dust, and improving the environmental conditions of the working face. However, since the fan often generates considerable noise due to the excessive inlet and outlet air flow and flow rate during operation, which not only causes noise pollution to the production environment, but also makes the equipment itself susceptible to damage, the fan needs to be equipped with a silencer at its inlet and outlet for noise reduction during operation. Otherwise, the noise emitted by the local ventilation fan for mines will be directly discharged during operation, which will generate a lot of noise (generally more than 100 decibels) in the local working area, and will cause noise pollution underground, affecting the health of workers and mutual communication. Due to the decline in workers' hearing, it is also very easy to cause safety accidents.

[0003] In order to reduce the noise emitted by the local ventilator when it is working, both ends of the existing local ventilator for mining are equipped with silencers formed by silencer plates arranged in a tic-tac-toe or maze-like pattern. Each silencer plate is composed of a plate with sieve holes and silencer cotton filled between the plates. The airflow is adsorbed by the silencer cotton on the plate, and the noise emitted by the ventilator when it is working will decrease. However, since the airflow direction of the existing mining ventilator is always parallel to the plane of the silencer plate arranged in a tic-tac-toe or maze-like pattern, although the airflow and flow rate close to the plane of the silencer plate will decrease, the middle airflow between the silencer plates will still have a large noise. Therefore, the silencer effect of the silencer plates arranged in a tic-tac-toe or maze-like pattern at both ends of the existing local ventilator for mining is not good enough, and the underground noise is still more than 70-80 decibels, which does not meet the requirement of underground noise below 70 decibels. Utility Model Content

[0004] In view of the problems existing in the above-mentioned prior art, the utility model provides an air inlet muffler used for a local ventilation fan in a mine, which not only has a good ventilation effect but also can make the working noise not exceed 70 decibels.

[0005] The technical solution adopted by the utility model to solve the technical problem is: an air inlet silencer used in a local ventilator for a mine, which is connected to a primary silencer at an air inlet of the local ventilator for a mine, the air inlet silencer comprises a steel shell box, an intermediate U-shaped silencer cabinet is fixedly arranged in the steel shell box, an internal U-shaped silencer cabinet is arranged in the intermediate U-shaped silencer cabinet, a first horizontal silencer plate and a first longitudinal silencer plate vertically staggered and connected are arranged in the internal U-shaped silencer cabinet, a third longitudinal silencer plate is arranged between the steel shell box and the intermediate U-shaped silencer cabinet, a second longitudinal silencer plate is arranged between the intermediate U-shaped silencer cabinet and the internal U-shaped silencer cabinet, the upper ends of the intermediate U-shaped silencer cabinet and the internal U-shaped silencer cabinet are open, and the intermediate U-shaped silencer cabinet is provided with a plurality of internal U-shaped silencers. The lower end of the U-shaped silencer cabinet is connected to the first horizontal silencer plate, the lower end of the internal U-shaped silencer cabinet is connected to the second horizontal silencer plate, the lower end of the air inlet silencer forms an L-shaped air duct which is connected to the first-level silencer through the third air inlet, the lower end of the middle U-shaped silencer cabinet forms an L-shaped air duct which is connected to the first-level silencer through the second air inlet, the lower end of the internal U-shaped silencer cabinet forms an L-shaped air duct which is connected to the first-level silencer through the first air inlet, a Z-shaped elastic support lower seat body is provided on the four sides of the steel shell box, a silencer material frame covered with a wire mesh is horizontally provided on the elastic support seat body, a compression grille wire mesh is provided on the upper opening of the steel shell box, and an elastic support upper seat body is provided between the compression grille wire mesh and the upper plane of the silencer material frame.

[0006] The muffler is composed of two sieve plates made of ordinary iron (steel) plates, galvanized steel plates or stainless steel plates by punching and muffler cotton filled between the sieve plates, which are screwed or welded to form the whole muffler. The sum of the sieve hole areas is not less than 70% of the sieve plate area. The sieve hole diameter is 5-10 mm, the hole spacing is 15-20 mm, and the sieve plate thickness is 2-3 mm.

[0007] The utility model is improved on the basis of the existing mine local ventilator, which has both the first-level and second-level silencers formed by silencer plates in a tic-tac-toe or maze-like distribution at both ends of the air inlet and the air outlet. The purpose is to install an air inlet silencer on the first-level silencer on the existing air inlet, so that the incoming airflow firstly contacts the silencer material horizontally arranged in the air inlet silencer for radial silence, that is, the airflow entering the fan vertically contacts the silencer material on the horizontal plane of the air inlet, and through the elastic support upper seat body and the elastic support lower seat body, the silencer material frame can generate pulse-like floating up and down, which can not only improve the durability of the silencer material frame, but also better uniformly absorb the noise on the cross section of the entire airflow vertically and horizontally, so that the airflow noise can be greatly reduced in a short time. After the airflow passes through the 100% surface contact silencer with the silencer material frame and then enters the middle U-shaped silencer cabinet 12 and the internal U-shaped silencer cabinet 21 in the air inlet silencer, its noise will decrease again, and the whole process will not exceed 70 decibels.

[0008] The blower air inlet silencer of the improved technical solution of the utility model can, during the process of performing silencer treatment on the blower air inlet position, use a horizontal silencer material frame so that the supporting connection direction of the silencer material frame is parallel to the air flow direction inside the silencer shell, so that the supporting effect of the sound-absorbing medium layer when the air flow impacts the sound-absorbing medium layer can be significantly improved.

[0009] The utility model is an air duct with an air inlet silencer designed to be both ventilating and silencing. The air inlet silencer first vertically silences the airflow and the silencing material, and then uses a silencing plate to silence the air horizontally, thereby reducing the noise generated by the local ventilator for mining, and the noise can be reduced to below 70 decibels. The utility model is not only compact in structure, easy to manufacture and maintain, but also has a strong silencing function. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a half-section structural schematic diagram of the utility model.

[0011] Figure 2 yes Figure 1 AA cross-sectional structure diagram,

[0012] Figure 3 yes Figure 1 BB cross-sectional structure diagram,

[0013] Figure 4 yes Figure 1 The enlarged cross-sectional view of the YY local structure,

[0014] Figure 5 yes Figure 4 Schematic diagram of the C-direction structure.

[0015] In the figure, 1, the first longitudinal silencer 2, the first-level silencer 3, the local ventilator 4, the second-level silencer 5, the compressed wire mesh plate 6, the internal U-shaped silencer cabinet 7, the upper grille 8, the silencer material 9, the second longitudinal silencer 10, the third longitudinal silencer 11, the first transverse silencer 12, the middle U-shaped silencer cabinet 13, the steel shell box 14, the first horizontal silencer 15, the second horizontal silencer 16, the third air inlet 17, the second air inlet 18, the first air inlet 19, the elastic support lower seat 20, the third transverse silencer 21, the second transverse silencer 22, the elastic support upper seat 23, the screw 24, the opening slot 25, the nut 26, the side grille 27, the lower grille 28, and the lug. DETAILED DESCRIPTION

[0016] In the figure, an air inlet silencer used in a local ventilation fan for a mine is connected to a primary silencer 2 at the air inlet of a local ventilation fan 3 for a mine, and a secondary silencer 4 is provided at the air outlet of the local ventilation fan for a mine. The air inlet silencer comprises a steel shell box 13, in which a middle U-shaped silencer cabinet 12 is fixedly arranged, in which an internal U-shaped silencer cabinet 6 is arranged, in which a first horizontal silencer plate 11 and a first longitudinal silencer plate 1 connected vertically and staggered are arranged, and between the steel shell box and the middle U-shaped silencer cabinet 12, an internal U-shaped silencer cabinet 6 is arranged, and in which a first horizontal silencer plate 11 and a first longitudinal silencer plate 1 connected vertically and staggered are arranged. A third longitudinal sound-absorbing board 10 is arranged between the middle U-shaped sound-absorbing cabinets, and a second longitudinal sound-absorbing board 9 is arranged between the middle U-shaped sound-absorbing cabinet and the inner U-shaped sound-absorbing cabinet. The upper ends of the middle U-shaped sound-absorbing cabinet and the inner U-shaped sound-absorbing cabinet are open, and the middle U-shaped sound-absorbing cabinet is formed with a third transverse sound-absorbing board 20 on both sides and a first horizontal sound-absorbing board 14 on the bottom (the lower end of the middle U-shaped sound-absorbing cabinet is connected to the first horizontal sound-absorbing board 14), and the inner U-shaped sound-absorbing cabinet is formed with a second transverse sound-absorbing board 21 on both sides and a second horizontal sound-absorbing board 15 on the bottom. The lower end of the inner U-shaped silencer cabinet is connected to the second horizontal silencer plate 15, the lower end of the air inlet silencer forms an L-shaped air duct connected to the first-stage silencer through the third air inlet 16, the lower end of the middle U-shaped silencer cabinet forms an L-shaped air duct connected to the first-stage silencer through the second air inlet 17, and the lower end of the inner U-shaped silencer cabinet forms an L-shaped air duct connected to the first-stage silencer through the first air inlet 18. The four sides of the steel shell box are fixed with a Z-shaped elastic support lower seat 19 (the lower end is suspended The wall is welded to the inner arm of the steel shell box, and the upper end is free in the sound-absorbing material frame 8). The elastic support seat body is horizontally provided with a wire mesh covering, and the sound-absorbing material frame is composed of an upper grille 7, a lower grille 27, a side grille 26 and a sound-absorbing material filled in the frame. The elastic support lower seat body is Z-shaped and made of a stainless steel plate with a thickness of 1.5-2 mm. The upper opening of the steel shell box is provided with a compression grille wire mesh 5, and a Z-shaped elastic support upper seat body 22 is provided between the compression grille wire mesh and the upper plane of the sound-absorbing material frame. The upper end of the elastic support upper seat body 22 is welded to the compression grille wire mesh, and the lower end is free (when the fan is working, the lower end surface of the elastic support upper seat body 22 is tightly attached to the upper plane of the sound-absorbing material frame. A lug 28 is provided in the middle of the four sides of the compression grille wire mesh, and an open slot 24 is provided on the lug. One end of the screw passes through the open slot and is fixedly connected to the steel shell box, and the other end is connected to the nut 25.

[0017] The muffler is composed of two sieve plates made of ordinary iron (steel) plates, galvanized steel plates or stainless steel plates by punching and muffler cotton filled between the sieve plates, which are screwed or welded to form the whole muffler. The sum of the sieve hole areas on each sieve plate is not less than 70% of the sieve plate area. The sieve hole diameter is 5-10 mm, the hole spacing is 15-20 mm, and the sieve plate thickness is 2-3 mm.

Claims

1. An air inlet muffler for a local ventilator for a mine, which is connected to a primary muffler (2) at an air inlet of a local ventilator for a mine (3), the air inlet muffler comprising a steel housing box (13), characterized in that: An intermediate U-shaped sound-absorbing cabinet (12) is fixedly arranged in the steel shell box, an internal U-shaped sound-absorbing cabinet (6) is arranged in the intermediate U-shaped sound-absorbing cabinet, a first horizontal sound-absorbing board (11) and a first longitudinal sound-absorbing board (1) which are vertically staggered and connected are arranged in the internal U-shaped sound-absorbing cabinet, a third longitudinal sound-absorbing board (10) is arranged between the steel shell box and the intermediate U-shaped sound-absorbing cabinet, a second longitudinal sound-absorbing board (9) is arranged between the intermediate U-shaped sound-absorbing cabinet and the internal U-shaped sound-absorbing cabinet, the upper ends of the intermediate U-shaped sound-absorbing cabinet and the internal U-shaped sound-absorbing cabinet are open, the lower ends of the intermediate U-shaped sound-absorbing cabinet are connected to the first horizontal sound-absorbing board (14), and the lower ends of the internal U-shaped sound-absorbing cabinet are connected to the second horizontal sound-absorbing board (15), An L-shaped air duct is formed at the lower end of the air inlet silencer and is connected to the first-stage silencer through the third air inlet (16); an L-shaped air duct is formed at the lower end of the intermediate U-shaped silencer cabinet and is connected to the first-stage silencer through the second air inlet (17); an L-shaped air duct is formed at the lower end of the internal U-shaped silencer cabinet (6) and is connected to the first-stage silencer through the first air inlet (18); a Z-shaped elastic support lower seat (19) is provided on the four sides of the steel shell box; a sound-absorbing material frame (8) covered with a wire mesh is horizontally provided on the elastic support seat; a compression grille wire mesh (5) is provided at the upper opening of the steel shell box; and an elastic support upper seat (22) is provided between the compression grille wire mesh and the upper plane of the sound-absorbing material frame.

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