A screw blower silencer

Abstract

The utility model belongs to the field of sound elimination technology, concretely relates to a screw blower silencer, include: screw blower, the output of screw blower is provided with the muffler, the bottom fixed connection of muffler has the flange air inlet, the flange air inlet with the output of screw blower is detachably installed, the top of muffler is provided with the flange air outlet, the inside of muffler is provided with the conical gas distribution cap, the outside of conical gas distribution cap is provided with the flow guiding layer disc, the rim of flow guiding layer disc is contacted with the inner wall of muffler, and the inside of muffler is filled with glass wool. The utility model can realize, and the inner disc of the multilayer inside conical gas distribution cap makes part of high speed gas form backflow, and diffuses to the step exhaust hole of all around and enters the inside glass wool and carries out deceleration, and another part of high speed airflow will be decelerated and diffused again through the conical hole.

Description

Technical Field

[0001] This utility model belongs to the field of noise reduction technology, specifically relating to a noise reduction device for a screw blower. Background Technology

[0002] The airflow noise of a screw blower primarily originates from the high-speed flow and turbulence of compressed air. The dramatic changes in airflow as gas passes through pipes, valves, and outlets generate noise. This noise is particularly pronounced under high-flow, high-pressure operating conditions. Prolonged exposure to this noise environment can lead to hearing damage, difficulty concentrating, and increased psychological stress. To mitigate these effects, noise can be reduced by optimizing the airflow path, installing silencers, and using sound-absorbing materials.

[0003] Problems with existing technology: Traditional screw blower outlet silencers mostly use round tube-type silencers, which are connected to the outside of the screw blower outlet and communicate with the outlet. The inside is a hollow structure, and the inner wall is filled with materials such as glass wool. Through the fiber structure of glass wool and the cavity structure of the silencer, the impact of high-speed airflow on the air is reduced, thus reducing noise. However, this method still allows some high-speed airflow to reach the outside through the cavity, and the airflow has less contact with the glass wool, resulting in poor noise reduction effect. Utility Model Content

[0004] The purpose of this invention is to provide a screw blower silencing device that can cause some high-speed gas to flow back through the multi-layered inner discs inside the conical air distribution cap and diffuse to the stepped exhaust holes around it to enter the glass wool for deceleration. The other part of the high-speed airflow will be decelerated and diffused again by the subsequent inner discs through the conical holes.

[0005] The specific technical solution adopted by this utility model is as follows: A screw blower silencing device includes: a screw blower, a silencer provided at the output end of the screw blower, a flange air inlet fixedly connected to the bottom of the silencer, the flange air inlet being detachably installed with the output end of the screw blower, and a flange air outlet provided at the top of the silencer; The muffler has a conical air distribution cap inside, and a flow guide plate is sleeved on the outside of the conical air distribution cap. The edge of the flow guide plate contacts the inner wall of the muffler, and the muffler is filled with glass wool.

[0006] The number of flow guide plates is multiple, and the multiple flow guide plates are arranged in a vertical array. The diameter of the silencer is larger than the output end of the screw blower.

[0007] The surfaces of adjacent flow guide disks are respectively provided with small array guide holes and large array guide holes, and the number of small array guide holes and large array guide holes is multiple.

[0008] The multiple small array guide holes and the large array guide holes are arranged in a ring array, and the diameter of the large array guide hole ring array is larger than the diameter of the small array guide hole ring array.

[0009] The conical air distribution cap is conical in shape, and its bottom is fixedly connected to the outer periphery of the output end of the screw blower.

[0010] The surface of the conical gas distribution cap is provided with multiple stepped exhaust holes. The stepped exhaust holes are arranged in a vertical array of multiple layers and are arranged in a ring array at the same height.

[0011] The number of stepped exhaust vents in the ring array decreases as the height increases.

[0012] The stepped exhaust port has multiple inner discs arranged in a vertical array inside. The inner discs are fixedly connected to the conical air distribution cap. Each of the inner discs has a conical hole inside, and the diameter of the conical hole decreases as the height increases.

[0013] The muffler is divided into two parts, an upper shell and a lower shell, in the middle. Connecting ears are fixedly connected to each other on the outer sides of the upper shell and the lower shell, and the two connecting ears are connected through a small array of guide holes.

[0014] Filter screens are fixedly connected to both the upper shell near the flange outlet and the lower shell near the input.

[0015] The technical effects achieved by this utility model are as follows: In this invention, the multi-layered inner discs inside the conical gas distribution cap cause some high-speed gas to flow back and diffuse to the stepped exhaust holes around it, where it enters the glass wool for deceleration. The other part of the high-speed airflow will be decelerated and diffused again by the subsequent inner discs through the conical holes.

[0016] This invention slows down high-speed airflow through glass wool. Under pressure, the high-speed airflow will move laterally within the same layer of glass wool through large and small array guide holes, increasing its contact with the glass wool and thus slowing it down more effectively. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the appearance structure of this utility model; Figure 2 This is a structural cross-sectional view of the muffler in this utility model; Figure 3 This is a schematic diagram of the flow guide plate in this utility model; Figure 4 This is a schematic diagram of the conical gas distribution cap in this utility model; Figure 5 This is a cross-sectional view of the conical gas distribution cap in this utility model.

[0018] The attached diagram lists the components represented by each number as follows: 1. Screw blower; 2. Silencer; 3. Flange inlet; 4. Flange outlet; 5. Filter screen; 201. Conical air distribution cap; 202. Guide plate; 203. Small array guide holes; 204. Large array guide holes; 205. Stepped exhaust port; 206. Inner plate; 207. Conical hole; 210. Upper shell; 220. Lower shell. Detailed Implementation

[0019] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0020] like Figure 1 - Figure 2 As shown, a screw blower silencing device includes: a screw blower 1, a silencer 2 provided at the output end of the screw blower 1, a flange air inlet 3 fixedly connected to the bottom of the silencer 2, the flange air inlet 3 being detachably installed from the output end of the screw blower 1, a flange air outlet 4 provided at the top of the silencer 2; a conical air distribution cap 201 provided inside the silencer 2, a guide plate 202 sleeved on the outer side of the conical air distribution cap 201, the edge of the guide plate 202 contacting the inner wall of the silencer 2, and glass wool filling the inside of the silencer 2.

[0021] The silencer 2 is externally connected to the output end of the screw blower 1. When the screw blower 1 starts to work, the gas first enters the interior of the conical gas distribution cap 201 through the flange inlet 3 at the bottom of the silencer 2. The conical gas distribution cap 201 then guides the high-speed gas to the space between multiple guide plate 202. The dispersed high-speed gas permeates into the glass wool between the guide plate 202. Under the layer-by-layer blocking of the glass wool fibers, the speed of the high-speed gas gradually decreases and is refined, and finally discharged through the flange outlet 4. The flange outlet 4 can be connected to other pipes to guide the airflow. Glass wool is cut and wrapped according to its shape to fit the shape between the flow guide plate 202 and the conical gas distribution cap 201. Glass wool is not placed inside the conical gas distribution cap 201.

[0022] See attached document Figure 2 - Figure 5The conical air distribution cap 201 is conical in shape, and its bottom is fixedly connected to the outer periphery of the output end of the screw blower 1. The surface of the conical air distribution cap 201 is provided with multiple stepped exhaust holes 205. The stepped exhaust holes 205 are arranged in a multi-layer vertical array, and the stepped exhaust holes 205 at the same height are arranged in a ring array. As the height increases, the number of stepped exhaust holes 205 in the ring array decreases. The interior of the stepped exhaust holes 205 is provided with multiple inner plates 206 arranged in a vertical array. The inner plates 206 are fixedly connected to the conical air distribution cap 201. Each of the multiple inner plates 206 has a conical hole 207 inside, and the diameter of the multiple conical holes 207 decreases as the height increases.

[0023] According to the above structure, when high-speed gas passes through the flange inlet 3, it will first enter the interior of the conical gas distribution cap 201. At this time, the airflow speed is the fastest. The airflow will hit the bottom inner plate 206 to form a backflow. It will collide with the subsequent airflow to reduce their kinetic energy. Then, it will quickly enter the glass wool through the surrounding stepped exhaust holes 205 and decelerate again. The airflow in the middle position will continue to move upward along the conical hole 207. Since the diameter of the upper conical hole 207 is smaller, some airflow will still diffuse to the surroundings and be affected by the backflow until it finally enters the glass wool. The flow guide plate 202 is arranged in parallel with the inner plate 206 to achieve rapid exhaust through multiple air holes. The large diameter ensures airflow and prevents air stagnation. At the same time, the stepped deceleration refines the gas, reducing turbulence and thus reducing noise.

[0024] See attached document Figure 2 - Figure 3 There are multiple flow guide plates 202, which are arranged in a vertical array. The diameter of the silencer 2 is larger than the output end of the screw blower 1. Small array guide holes 203 and large array guide holes 204 are respectively opened on the surface of adjacent flow guide plates 202. There are multiple small array guide holes 203 and large array guide holes 204. The multiple small array guide holes 203 and large array guide holes 204 are arranged in a ring array. The diameter of the ring array of large array guide holes 204 is larger than the diameter of the ring array of small array guide holes 203.

[0025] According to the above structure, the airflow entering the glass wool will enter the upper layer through the large array guide hole 204 under the action of pressure, and then need to enter the upper layer through the small array guide hole 203. In this process, since the diameter of the large array guide hole 204 is larger than the diameter of the small array guide hole 203, the high-speed airflow needs to move laterally a certain distance before it can enter the upper layer, so that the high-speed airflow can come into closer contact with the glass wool. The size and shape of the conical hole 207 are adapted to the outer wall of the conical gas distribution cap 201. During installation, the flow guide plate 202 can be sequentially fitted onto the outside of the conical gas distribution cap 201. Glass wool is placed between two adjacent flow guide plates 202 during the fitting process.

[0026] See attached document Figure 2 The silencer 2 is divided into two parts, an upper shell 210 and a lower shell 220, from the middle position. Connecting ears are fixedly connected to each other on the outer side of the upper shell 210 and the lower shell 220, and the two connecting ears are connected by bolts. Filter screens 5 are fixedly connected to the upper shell 210 near the flange outlet 4 and the lower shell 220 near the input.

[0027] According to the above structure, the outer shell of the muffler 2 consists of two parts, which are connected by connecting ears and then fixed by bolts. When it is necessary to replace the glass wool inside, the upper shell 210 and the lower shell 220 can be separated by loosening the bolts for replacement. The filter screen 5 plays a filtering role to prevent the glass fiber cotton from spreading.

[0028] The working principle of this utility model is as follows: The silencer 2 is externally connected to the output end of the screw blower 1. When the screw blower 1 starts working, the gas first enters the interior of the conical air distribution cap 201 through the flange air inlet 3 at the bottom of the silencer 2. The airflow will hit the inner plate 206 at the bottom to form a backflow, and collide with the subsequent airflow to reduce their kinetic energy. Then, it quickly enters the interior of the glass wool through the surrounding stepped exhaust holes 205, where it is decelerated again. The airflow in the middle position will continue to move upward along the conical hole 207. Due to the upper conical hole 207, the airflow continues to move upward. 07 has a relatively small diameter, so some airflow will still diffuse to the surroundings. Affected by backflow, the conical gas distribution cap 201 guides the high-speed gas to the space between multiple guide plate 202. The dispersed high-speed gas permeates into the glass wool between the guide plate 202. Under the layered obstruction of the glass wool fibers, the speed of the high-speed gas gradually decreases and is refined, and finally discharged through the flange outlet 4. This achieves rapid exhaust through multiple pores, and the large diameter can ensure the airflow and prevent air stagnation. At the same time, the step-like deceleration refines the gas, reduces turbulence, and thus reduces noise.

[0029] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A blower silencing device, comprising a screw blower (1), characterized in that: The output end of the screw blower (1) is provided with a silencer (2), and the bottom of the silencer (2) is fixedly connected with a flange air inlet (3). The flange air inlet (3) and the output end of the screw blower (1) are detachably installed. The top of the silencer (2) is provided with a flange air outlet (4). The muffler (2) is provided with a conical air distribution cap (201) inside. A flow guide plate (202) is sleeved on the outside of the conical air distribution cap (201). The edge of the flow guide plate (202) is in contact with the inner wall of the muffler (2). The muffler (2) is filled with glass wool.

2. The silencing device according to claim 1, characterized in that: The number of the flow guide plate (202) is multiple, and the multiple flow guide plate (202) are arranged in a vertical array. The diameter of the silencer (2) is larger than the output end of the screw blower (1).

3. The silencing device according to claim 1, characterized in that: The surfaces of adjacent flow guide disks (202) are respectively provided with small array guide holes (203) and large array guide holes (204), and the number of small array guide holes (203) and large array guide holes (204) is multiple.

4. The silencing device according to claim 3, characterized in that: The multiple small array guide holes (203) and large array guide holes (204) are arranged in a ring array, and the diameter of the ring array of the large array guide holes (204) is larger than the diameter of the ring array of the small array guide holes (203).

5. The silencing device according to claim 1, characterized in that: The conical air distribution cap (201) is conical in shape, and the bottom of the conical air distribution cap (201) is fixedly connected to the outer periphery of the output end of the screw blower (1).

6. The silencing device according to claim 1, characterized in that: The surface of the conical air distribution cap (201) is provided with multiple stepped exhaust holes (205). The stepped exhaust holes (205) are arranged in a vertical array of multiple layers, and the stepped exhaust holes (205) at the same height are arranged in a ring array.

7. The silencing device according to claim 6, characterized in that: The number of ring arrays of the stepped exhaust holes (205) decreases as the height increases.

8. The silencing device according to claim 6, characterized in that: The stepped exhaust port (205) has a vertical array of multiple inner discs (206) inside. The inner discs (206) are fixedly connected to the conical air distribution cap (201). Each of the multiple inner discs (206) has a conical hole (207) inside. The diameter of the multiple conical holes (207) decreases as the height increases.

9. The silencing device according to claim 1, characterized in that: The silencer (2) is divided into two parts, an upper shell (210) and a lower shell (220), from the middle position. The upper shell (210) and the lower shell (220) are fixedly connected with connecting ears at positions close to each other on the outer side. The two connecting ears are connected through small array guide holes (203).

10. The silencing device according to claim 9, characterized in that: The upper shell (210) near the flange outlet (4) and the lower shell (220) near the input are both fixedly connected with filter screens (5).

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