Exhaust system differential pressure anti-pollution device

Abstract

This invention provides a differential pressure pollution prevention device for an exhaust system, including a manifold. A discharge pipe is fixedly connected to one side of the manifold near its top. A high-pressure pipe and a low-pressure pipe are connected through the bottom of the manifold, located to one side of the high-pressure pipe. A coaxial conical cap with its smaller end facing downwards is slidably connected above the low-pressure pipe. The diameter of the low-pressure pipe is larger than the outer diameter of the smaller end of the conical cap but smaller than the outer diameter of the larger end of the conical cap. In this invention, a conical cap is provided at the opening of the low-pressure pipe inside the manifold. The conical cap and the low-pressure pipe slide in cooperation. After the conical cap moves towards the low-pressure pipe, it can seal the low-pressure pipe. Therefore, when the high-pressure pipe discharges high-pressure exhaust gas into the manifold, this high-pressure exhaust gas will push the conical cap to seal the low-pressure pipe, thereby preventing high-pressure exhaust gas from entering the low-pressure pipe and effectively preventing pollutants (impurities) from contaminating the materials inside the low-pressure equipment.

Description

Technical Field

[0001] This utility model relates to the field of exhaust technology in chemical engineering, specifically to an exhaust system differential pressure pollution prevention device. Background Technology

[0002] In the field of chemical engineering, chemical equipment needs to exhaust gases during the production process. This is mainly to control and eliminate residual heat, moisture, toxic and harmful gases, and flammable and explosive substances generated during production, to ensure production safety, improve the working environment, and meet environmental protection requirements. The equipment for exhausting chemical equipment mainly includes low-pressure exhaust equipment and high-pressure exhaust equipment. The gases discharged by these two types of equipment have different pressures, that is, there is a pressure difference. When laying exhaust pipelines, low-pressure exhaust pipes and high-pressure exhaust pipes are usually merged into the same pipeline and then discharged to the tail gas treatment system.

[0003] However, the above-mentioned exhaust structure still has shortcomings in use: when high-pressure and low-pressure exhaust are performed simultaneously, the high-pressure gas cannot enter the exhaust gas transmission pipe quickly due to excessive pressure. As a result, some of the high-pressure gas will enter the low-pressure equipment connected to it through the low-pressure exhaust pipe. If this part of the high-pressure gas contains impurities (particulate matter, scale, etc.), these impurities will contaminate the materials in the low-pressure equipment, which will lead to the subsequent production of substandard products.

[0004] Therefore, this utility model provides a differential pressure anti-pollution device for exhaust systems. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a differential pressure pollution prevention device for exhaust systems to solve the problems mentioned in the background technology. This utility model has the function of blocking high-pressure gas from entering the low-pressure gas pipeline when high-pressure and low-pressure gas are discharged, and can effectively prevent pollutants from entering the low-pressure equipment.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a differential pressure pollution prevention device for an exhaust system, comprising a manifold, a discharge pipe fixedly connected to one side of the manifold near the top, a high-pressure pipe and a low-pressure pipe located on one side of the high-pressure pipe passing through the bottom of the manifold, a coaxial conical cap with its small end facing downwards slidably connected above the low-pressure pipe, the diameter of the low-pressure pipe being larger than the outer diameter of the small end of the conical cap and smaller than the outer diameter of the large end of the conical cap, and a sealing sleeve adapted to the low-pressure pipe being fixedly fitted on the outside of the conical cap.

[0007] Furthermore, a guide post is fixedly connected inside the low-pressure pipe. The top of the guide post extends above the low-pressure pipe and is provided as a through-conical cap. The conical cap and the guide post are slidably connected.

[0008] Furthermore, a nut is screwed onto the top of the guide post, and a support spring is fitted onto the guide post between the nut and the conical cap.

[0009] Furthermore, a guide sleeve is welded to the middle of the conical cap and fitted onto the outside of the guide post, and a sealing rubber sleeve is fixedly fitted inside the guide sleeve.

[0010] Furthermore, the large end of the conical cap is fixedly connected to a coaxial support ring, and a guide pipe is fitted on the outside of the support ring and fixedly connected to the bottom wall of the manifold. The guide pipe and the support ring are slidably connected. Several vent holes are opened on the conical wall of the conical cap near the large end and distributed in a circumferential manner. A filter screen is provided on the upper end face of the support ring.

[0011] Furthermore, the outer diameter of the filter screen is larger than the inner diameter of the support ring but smaller than the outer diameter of the support ring. The filter screen and the support ring are slidably connected vertically. A sealing ring that matches the top wall of the support ring is bonded to the lower end face of the filter screen.

[0012] Furthermore, the manifold includes an upper cover and a bottom plate, and the bottom of the upper cover is fixedly fitted with a connecting flange that is bolted to the bottom plate.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. In this utility model, a conical cap is provided at the opening of the low-pressure pipe in the manifold. The conical cap and the low-pressure pipe are slidably fitted. After the conical cap moves toward the low-pressure pipe, it can block the low-pressure pipe. Thus, when the high-pressure pipe discharges high-pressure exhaust gas into the manifold, this part of the high-pressure exhaust gas will push the conical cap to block the low-pressure pipe, thereby preventing high-pressure exhaust gas from entering the low-pressure pipe. This can effectively prevent pollutants (impurities) from contaminating the materials in the low-pressure equipment.

[0015] 2. In this utility model, by setting a guide pipe, a support ring, a filter screen and a vent hole, when the conical cover cannot reliably seal the outlet of the low-pressure pipe due to obstruction by debris, the filter screen can filter the exhaust gas entering the low-pressure pipe and effectively prevent pollutants from entering the low-pressure equipment, thereby improving the reliability of the device in preventing pollution emissions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a differential pressure pollution prevention device for an exhaust system according to the present invention;

[0017] Figure 2 for Figure 1 The main view;

[0018] Figure 3 for Figure 1 A diagram showing the effect after removing the top cover;

[0019] Figure 4 for Figure 3 A diagram showing the unfolding after the explosion;

[0020] Figure 5 This is a schematic diagram of the bottom of the filter screen of a differential pressure anti-pollution device for an exhaust system according to this utility model.

[0021] In the diagram: 1. Manifold; 11. Upper cover; 12. Base plate; 2. High-pressure pipe; 3. Low-pressure pipe; 31. Guide post; 4. Conical cover; 41. Guide sleeve; 42. Vent hole; 5. Nut; 6. Support spring; 7. Sealing sleeve one; 8. Sealing sleeve two; 9. Support ring; 101. Drainage pipe; 111. Connecting flange; 102. Filter screen; 103. Sealing ring; 104. Discharge pipe. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Please see Figures 1 to 5 This utility model provides a technical solution: a differential pressure pollution prevention device for an exhaust system, including a manifold 1. A discharge pipe 104 is fixedly connected to one side of the manifold 1 near the top. In use, the discharge pipe 104 is connected to the exhaust gas transmission pipeline. The manifold 1 is used to combine low-pressure and high-pressure gases. The gas in the manifold 1 enters the exhaust gas transmission pipeline through the discharge pipe 104. A high-pressure pipe 2 and a low-pressure pipe 3 are installed through the bottom of the manifold 1. The high-pressure pipe 2 and the low-pressure pipe 3 are respectively connected to high-pressure equipment and low-pressure equipment via pipelines, and control valves are installed on these pipelines.

[0024] In this technical solution, a coaxial conical cap 4 with its small end facing downwards is slidably connected above the low-pressure pipe 3. Specifically, a guide post 31 is fixedly connected inside the low-pressure pipe 3. In practice, a horizontal plate is welded to the inner wall of the low-pressure pipe 3, and the bottom of the guide post 31 is welded to the horizontal plate. The top of the guide post 31 extends above the low-pressure pipe 3 and penetrates the conical cap 4. The conical cap 4 and the guide post 31 are slidably connected. The diameter of the low-pressure pipe 3 is larger than the outer diameter of the small end of the conical cap 4 but smaller than the outer diameter of the large end of the conical cap 4. When the outer conical wall of the conical cap 4 fits against the low-pressure pipe 3, it can seal the low-pressure pipe 3. A sealing sleeve 7 adapted to the low-pressure pipe 3 is fixedly fitted on the outside of the conical cap 4. The sealing sleeve 7 can improve the sealing degree after the conical cap 4 and the low-pressure pipe 3 are connected.

[0025] Among them, the conical cover 4 has a guide sleeve 41 welded to the middle of the guide post 31. The guide sleeve 41 slides along the guide post 31. A sealing rubber sleeve 2 8 is fixedly fitted inside the guide sleeve 41. The function of the sealing rubber sleeve 2 8 is to eliminate the gap between the guide sleeve 41 and the guide post 31.

[0026] In this embodiment, a nut 5 is screwed onto the top of the guide post 31, and a support spring 6 is sleeved on the guide post 31 between the nut 5 and the conical cover 4. The function of the support spring 6 is to apply an elastic thrust to the conical cover 4, so that the low-pressure pipe 3 will be blocked by the conical cover 4 when it is not venting. When the low-pressure pipe 3 vents, the gas will overcome the elastic force of the support spring 6 and push open the conical cover 4.

[0027] Furthermore, the large end of the conical cover 4 is fixedly connected to a coaxial support ring 9. The outer side of the support ring 9 is fitted with a guide pipe 101 that is fixedly connected to the bottom of the manifold 1. The guide pipe 101 and the support ring 9 are slidably connected. In specific implementation, a sealing sleeve 3 is fixedly fitted inside the guide pipe 101. The sealing sleeve 3 is used to eliminate the gap between the support ring 9 and the guide pipe 101. Several vent holes 42 are opened on the conical wall of the conical cover 4 near the large end and distributed in a circumferential manner. A filter screen 102 is provided on the upper end face of the support ring 9. When the conical cover 4 cannot be closed, the high-pressure airflow in the manifold 1 will pass through the filter screen 102 and the vent holes 42 in sequence, and then enter the low-pressure pipe 3. Due to the filtering effect of the filter screen 102, impurities are blocked and cannot enter the low-pressure equipment, thereby further improving the reliability of pollution prevention.

[0028] In this embodiment, the outer diameter of the filter screen 102 is larger than the inner diameter of the support ring 9 but smaller than the outer diameter of the support ring 9. The filter screen 102 and the support ring 9 are slidably connected. Specifically, three guide shafts are welded to the bottom wall of the frame of the filter screen 102, and three ear plates are welded to the inner peripheral wall of the support ring 9. Guide holes are provided on the ear plates and fitted outside the guide shafts. The guide shafts and guide holes are slidably connected. A sealing ring 103 that matches the top wall of the support ring 9 is bonded to the lower end face of the filter screen 102. The sealing ring 103 eliminates the gap between the contact surfaces of the filter screen 102 and the support ring 9. The movable setting of the filter screen 102 allows the low-pressure gas to push the filter screen 102 upward when the conical cover 4 is opened, so that the low-pressure gas can be discharged through the space between the filter screen 102 and the guide pipe 101, thereby effectively discharging the low-pressure gas containing impurities.

[0029] In this embodiment, the manifold 1 includes an upper cover 11 and a bottom plate 12. The bottom of the upper cover 11 is fixedly fitted with a connecting flange 111 that is bolted to the bottom plate 12. When in use, a gasket is placed between the top of the connecting flange 111 and the bottom plate 12. After removing the upper cover 11, the structure inside the manifold 1 will be exposed, which is convenient for maintaining the structure inside the manifold 1.

[0030] Working principle: When high-pressure pipe 2 and low-pressure pipe 3 exhaust gas simultaneously, the gas in high-pressure pipe 2 and low-pressure pipe 3 will enter manifold 1 and then enter the exhaust gas pipeline through exhaust pipe 104. When the pressure of the gas discharged from high-pressure pipe 2 is too high, some gas in manifold 1 will flow into low-pressure pipe 3. At this time, the conical cover 4 will move towards low-pressure pipe 3 under the pressure of the gas. When the opening of low-pressure pipe 3 is blocked, high-pressure gas cannot enter low-pressure pipe 3. When the opening of low-pressure pipe 3 cannot be blocked by conical cover 4, the filter screen 102 will filter the exhaust gas entering the guide pipe 101, so that this part of the exhaust gas does not contain impurities. When the high-pressure pipe 2 is closed by controlling the valve, the gas in the low-pressure pipe 3 will push open the conical cover 4 and then discharge the gas. The gas enters the guide pipe 101, then passes through the vent 42, pushes the filter screen 102 upward, and then enters the manifold 1. Finally, it enters the exhaust pipe through the discharge pipe 104 to achieve the discharge of low-pressure air.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A differential pressure pollution prevention device for an exhaust system, comprising a manifold (1), wherein a discharge pipe (104) is fixedly connected to one side of the manifold (1) near the top, and a high-pressure pipe (2) and a low-pressure pipe (3) located on one side of the high-pressure pipe (2) are provided through the bottom of the manifold (1), characterized in that, The low-pressure pipe (3) is slidably connected to a coaxial conical cap (4) with its small end facing down. The diameter of the low-pressure pipe (3) is larger than the outer diameter of the small end of the conical cap (4) and smaller than the outer diameter of the large end of the conical cap (4). The conical cap (4) is fixedly fitted with a sealing sleeve (7) that is compatible with the low-pressure pipe (3).

2. The differential pressure pollution prevention device for an exhaust system according to claim 1, characterized in that: A guide post (31) is fixedly connected inside the low-pressure pipe (3). The top of the guide post (31) extends above the low-pressure pipe (3) and is set to penetrate the conical cap (4). The conical cap (4) and the guide post (31) are slidably connected.

3. The exhaust system differential pressure pollution prevention device according to claim 2, characterized in that: The top of the guide post (31) is screwed with a nut (5), and a support spring (6) is sleeved on the guide post (31) between the nut (5) and the conical cap (4).

4. The exhaust system differential pressure pollution prevention device according to claim 2, characterized in that: The conical cap (4) has a guide sleeve (41) welded to the middle part and sleeved on the outside of the guide post (31). A sealing rubber sleeve (8) is fixedly sleeved inside the guide sleeve (41).

5. The differential pressure pollution prevention device for an exhaust system according to claim 1, characterized in that: The conical cap (4) is fixedly connected to a coaxial support ring (9) at its large end. The support ring (9) is fitted with a guide pipe (101) that is fixedly connected to the bottom of the manifold (1). The guide pipe (101) and the support ring (9) are slidably connected. The conical cap (4) has several vent holes (42) that are close to the large end and arranged in a circumferential pattern. The upper end face of the support ring (9) is provided with a filter screen (102).

6. The differential pressure pollution prevention device for an exhaust system according to claim 5, characterized in that: The outer diameter of the filter screen (102) is larger than the inner diameter of the support ring (9) and smaller than the outer diameter of the support ring (9). The filter screen (102) and the support ring (9) are slidably connected. A sealing ring (103) that matches the top wall of the support ring (9) is bonded to the lower end face of the filter screen (102).

7. The differential pressure pollution prevention device for an exhaust system according to claim 1, characterized in that: The manifold (1) includes an upper cover (11) and a bottom plate (12). The bottom of the upper cover (11) is fixedly fitted with a connecting flange (111) that is bolted to the bottom plate (12).

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