Emptying speed reduction flow divider for gas flow standard device

Abstract

The utility model relates to an emptying and speed reducing flow divider for a gas flow standard device, which is integrally of an upward expanding structure and comprises a mounting flange and a concentric different-diameter outer cylinder, the mounting flange is connected with a device outlet flange, an inner cylinder is arranged in the concentric different-diameter outer cylinder, and the lower end of the concentric different-diameter outer cylinder is connected with an elbow. The inner cylinder, the concentric different-diameter outer cylinder and the elbow are filled with sound-absorbing material rock wool; a first-stage screen, a second-stage screen, a third-stage screen, a fourth-stage screen and a fifth-stage screen are sequentially arranged in the concentric reducing outer barrel and the elbow in the airflow direction, a cross partition plate is arranged between the second-stage screen and the third-stage screen, and the top end of the concentric reducing outer barrel is connected with a rain cap through an outer hexagon bolt. Meanwhile, the sound absorbing material is used for absorbing sound energy, so that the noise is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas flow processing technology, specifically to an venting speed reduction and diverter for a gas flow standard device. Background Technology

[0002] When a gas flow standard device operates at high flow rates, the vibration of the vacuum pump, the undulating motion and impact of the gas flow after passing through the vacuum pump, and the parallel operation of multiple vacuum pumps will generate significant aerodynamic noise at the exhaust manifold outlet, harming the surrounding environment. Existing general-purpose silencers cannot meet the device's requirements in terms of performance and installation; therefore, a new, dedicated exhaust speed reducer / diverter needs to be designed. Utility Model Content

[0003] To address the aforementioned problems, this utility model discloses an venting speed reduction diverter for a gas flow standard device.

[0004] The specific technical solution is as follows:

[0005] An exhaust speed reducer for a gas flow standard device has an overall upward expansion structure, including a mounting flange (1) and a concentric reducing outer cylinder (9). The mounting flange (1) is connected to the outlet flange of the device. An inner cylinder (7) is provided inside the concentric reducing outer cylinder (9). An elbow (3) is connected to the lower end of the concentric reducing outer cylinder (9). The inner cylinder (7), the concentric reducing outer cylinder (9), and the elbow (3) are all filled with sound-absorbing rock wool (13). A first-stage screen (2), a second-stage screen (4), a third-stage screen (6), a fourth-stage screen (8), and a fifth-stage screen (11) are arranged sequentially along the airflow direction inside the concentric reducing outer cylinder (9) and the elbow (3). A cross partition (5) is provided between the second-stage screen (4) and the third-stage screen (6). A rain cap (12) is connected to the top of the concentric reducing outer cylinder (9) by an external hexagonal bolt (10).

[0006] The cross-shaped partition (5) is vertically arranged between the secondary screen (4) and the tertiary screen (6).

[0007] The rain cap (12) has an umbrella-shaped structure, and the edge of the rain cap (12) covers the top of the concentric outer cylinder (9) with different diameters.

[0008] The apertures of the first-level screen (2) to the fifth-level screen (11) decrease sequentially according to the airflow direction.

[0009] The elbow (3) is a 90° curved pipe.

[0010] The advantages of this invention are: this device achieves noise reduction by combining multiple methods such as dispersing and diffusing airflow, increasing flow resistance, and absorbing sound to reduce noise, thereby reducing the speed and flow. It effectively solves the problem of excessive noise at the outlet of the vacuum pump exhaust manifold of the gas flow standard device. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 for Figure 1 A schematic diagram of the AA cross-section. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] An exhaust speed reducer for a gas flow standard device, having an overall upward expansion structure, includes a mounting flange 1 and a concentric reducing outer cylinder 9. The mounting flange 1 is connected to the device outlet flange. An inner cylinder 7 is provided inside the concentric reducing outer cylinder 9. An elbow 3 is connected to the lower end of the concentric reducing outer cylinder 9. The inner cylinder 7, the concentric reducing outer cylinder 9, and the elbow 3 are all filled with sound-absorbing rock wool 13. A primary screen 2, a secondary screen 4, a tertiary screen 6, a quaternary screen 8, and a quinary screen 11 are sequentially arranged along the airflow direction inside the concentric reducing outer cylinder 9 and the elbow 3. A cross partition 5 is provided between the secondary screen 4 and the tertiary screen 6. A rain cap 12 is connected to the top of the concentric reducing outer cylinder 9 by an external hexagonal bolt 10.

[0015] The cross-shaped partition 5 is vertically arranged between the secondary screen 4 and the tertiary screen 6.

[0016] The rain cap 12 has an umbrella-shaped structure, and the edge of the rain cap 12 covers the top of the concentric outer cylinder 9 with different diameters.

[0017] The apertures of the primary screen 2 to the fifth screen 11 decrease sequentially according to the airflow direction.

[0018] The elbow 3 is a 90° curved pipe.

[0019] The working principle of this invention is as follows: When the gas flow standard device needs to vent gas, the gas enters the venting speed-reducing distributor through the mounting flange. The mounting flange is tightly connected to the outlet flange of the gas flow standard device, ensuring that the gas can flow smoothly and stably into the distributor. After the gas enters the concentric outer cylinder, its flow area gradually increases. According to the principles of fluid mechanics, under a certain flow rate, an increase in flow area will inevitably reduce the gas velocity. At the same time, the multi-stage screen structure not only reduces the gas velocity but also effectively diverts the gas. When the gas passes through the screen, it is dispersed into multiple small airflows. This diversion process changes the sound propagation path, causing reflection, refraction, and interference phenomena during sound propagation, thereby attenuating the sound energy and achieving the purpose of reducing noise. The elbows, concentric outer cylinder, and inner cylinder of the distributor all adopt a double-layer structure: the outer layer is a 304 stainless steel plate, and the inner layer is a 304 stainless steel screen plate, filled with sound-absorbing rock wool. When sound travels through the double-layer structure, the stainless steel screen plate can initially scatter and reflect the sound, while the porous sound-absorbing materials such as rock wool have a large number of tiny pores. When sound enters these pores, it causes the air molecules to vibrate, converting sound energy into heat energy and consuming it, thus effectively absorbing sound energy and reducing sound transmission. The gas is finally discharged from the five-stage screen, and the rain cap can act as a rain shield, protecting the internal structure of the distributor from rainwater erosion.

Claims

1. A vented flow reducer for a gas flow standard device, which is integrally of upwardly expanding structure, comprising a mounting flange (1) and a concentric reducing outer cylinder (9), characterised in that: The installation flange (1) is connected with the device outlet flange, the concentric reducing outer cylinder (9) is internally provided with an inner cylinder (7), the lower end of the concentric reducing outer cylinder (9) is connected with an elbow (3), the inner cylinder (7) and the concentric reducing outer cylinder (9) and the elbow (3) are internally filled with sound-absorbing material rock wool (13); a first-stage screen (2), a second-stage screen (4), a third-stage screen (6), a fourth-stage screen (8) and a fifth-stage screen (11) are sequentially arranged in the concentric reducing outer cylinder (9) and the elbow (3) along the airflow direction; a cross partition (5) is arranged between the second-stage screen (4) and the third-stage screen (6); the top end of the concentric reducing outer cylinder (9) is connected with a rain cap (12) through an outer hexagonal bolt (10).

2. The emptying downflow separator according to claim 1, characterized in that: The cross partition (5) is vertically arranged between the second-stage screen (4) and the third-stage screen (6).

3. The emptying downflow separator according to claim 1, wherein: The rain cap (12) is an umbrella-shaped structure, and the rain cap (12) edge covers the top end of the concentric reducing outer cylinder (9).

4. The emptying downflow separator according to claim 1, wherein: The pore diameters of the first-stage screen (2) to the fifth-stage screen (11) sequentially decrease along the airflow direction.

5. The emptying downflow separator according to claim 1, wherein: The elbow (3) is a 90° curved pipeline.

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