Anti-backflow device for bulk gas mixing

Abstract

The utility model provides a kind of bulk gas mixing uses anti-backflow device, it is related to anti-backflow device technical field, the bulk gas mixing uses anti-backflow device, including device body, the device body top is equipped with two installation grooves, the device body one side is equipped with the flow guide duct that penetrates two installation grooves, the installation groove is adapted to have check plate body, the device body top and the corresponding position of each installation groove relative is fixedly connected with outer thread ring, the outer thread ring outside is threadedly equipped with threaded sleeve, the threaded sleeve bottom and check plate body between be provided with sealing plate, the sealing plate is located in outer thread ring inside;The bulk gas mixing uses anti-backflow device, by setting detachable mounting structure's check plate body, by threaded sleeve and outer thread ring cooperation, realize quick disassembly, it is convenient to maintain or replace check plate body, reduce maintenance cost, prolong device overall service life.

Description

Technical Field

[0001] This utility model relates to an anti-backflow device for bulk gas mixing, specifically an anti-backflow device for bulk gas mixing, belonging to the technical field of anti-backflow devices. Background Technology

[0002] Bulk gases generally refer to basic gases used in large quantities, with wide applications, and relatively low prices in industry. In industrial gas transportation systems, especially in the mixing of bulk gases (such as nitrogen, oxygen, hydrogen, carbon dioxide, etc.), multiple gases are usually mixed and transported to downstream process equipment through pipelines. To prevent backflow of gases in pipelines, check valves are typically installed in the pipeline system.

[0003] In the prior art, a gas pipeline check valve is disclosed in the patent announcement number CN103388692A, which includes a valve body and a valve disc. The valve disc is tightly fitted with the sealing surface inside the valve body. A rotating shaft is fixedly connected to the valve disc. The rotating shaft is hinged to the valve body and its other end extends out of the valve body and is connected to a rocker arm for opening or closing the valve disc. The hinge joint between the rotating shaft and the valve body is sealed.

[0004] Currently, most common gas check devices employ a valve-type structure. Their working principle relies on airflow to open the valve disc, and when the airflow stops or reverses, the valve disc automatically closes via a spring or gravity, thus achieving backflow prevention. However, in practical applications, bulk gases may contain trace impurities or corrosive components. After prolonged use, the valve disc surface is prone to corrosion and wear, leading to decreased sealing performance and weakened backflow prevention. Therefore, regular maintenance and replacement are necessary. However, in existing structures, the valve disc is usually integrated with the valve body or fixed using welding / clamping methods, making disassembly difficult and maintenance costs high. Once the valve disc fails, the entire check device often needs to be replaced, resulting in wasted resources. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] The purpose of this invention is to provide a backflow prevention device for bulk gas mixing in order to solve the above-mentioned problems, thereby solving the problem of cumbersome valve replacement in existing backflow prevention devices for bulk gas mixing.

[0007] (II) Technical Solution

[0008] This utility model is achieved through the following technical solution: a backflow prevention device for bulk gas mixing, comprising a device body, two mounting slots on the top of the device body, a guide pipe penetrating the two mounting slots on one side of the device body, a check plate adapted in the mounting slot, and an external threaded ring fixedly connected to the top of the device body at a corresponding position relative to each mounting slot, a threaded sleeve threadedly fitted on the outer side of the external threaded ring, and a sealing plate provided between the bottom of the threaded sleeve and the check plate, the sealing plate being located inside the external threaded ring.

[0009] Preferably, the check plate body includes a mounting plate, a check groove is provided on one side of the mounting plate, a through-hole is formed on the inner wall of the check groove, and a valve body is rotatably connected to the inner wall of the check groove, the valve body cooperating with the inner wall of the check groove.

[0010] Preferably, the check groove is inclined on one side of the inner wall of the through-hole, and a gravity block is fixedly provided on the movable end of the valve body, the gravity block being located on the side of the valve body away from the through-hole.

[0011] Preferably, a sealing ring is fixedly provided on the side of the valve body away from the gravity block, and an annular groove is formed at the corresponding position of the check groove relative to the sealing ring, the annular groove being located on the outside of the opening.

[0012] Preferably, a second sealing ring is fixedly sleeved on the outer side of the mounting plate, and a second sealing groove is formed at the corresponding position of the mounting groove relative to the second sealing ring.

[0013] Preferably, a circular plate is provided inside the external threaded ring, the circular plate is located below the sealing plate, a top plate is fixedly connected to the bottom of the circular plate, and a groove is opened on the top plate at the corresponding position of the sealing ring, the top plate is adapted to the top opening of the mounting groove.

[0014] Preferably, the threaded sleeve has an internal threaded groove at its bottom, and a stop block is fixedly connected to the top wall inside the internal threaded groove. The stop block contacts the top of the sealing plate, and a handle distributed in a circumferential array is fixedly connected to the outside of the threaded sleeve.

[0015] Preferably, a switching valve is installed at both ends of the device body.

[0016] This utility model provides a backflow prevention device for bulk gas mixing, which has the following beneficial effects:

[0017] 1. This anti-backflow device for bulk gas mixing features a check plate with a detachable installation structure. The check plate is quickly disassembled and installed via a threaded sleeve and an external threaded ring, facilitating maintenance or replacement of the check plate, reducing maintenance costs, and extending the overall service life of the device.

[0018] 2. This anti-backflow device for bulk gas mixing uses a gravity block in conjunction with an inclined inner wall to quickly reset the valve when the airflow stops or reverses, closing the opening. It has a fast response speed and reliable anti-backflow effect.

[0019] 3. This anti-backflow device for bulk gas mixing uses a plate-shaped valve disc (check valve body). This structure is easy to disassemble, clean, and maintain, abandoning the traditional integrated design of valve disc and valve body. Therefore, during maintenance, only the check valve body needs to be replaced or repaired, thus effectively reducing the use and maintenance cost of the entire anti-backflow device.

[0020] 4. This anti-backflow device for bulk gas mixing is equipped with two rows of installation slots, two sets of check plates, and two sets of switching valves. The switching valves shut off the gas supply, making it easy to disassemble and assemble the check plates. The two sets of check plates can be disassembled and used separately to increase the working efficiency of the anti-backflow device, or they can be used together to increase the anti-backflow effect of the device. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0022] Figure 2 This is a three-dimensional cross-sectional view of the entire utility model;

[0023] Figure 3 This is a three-dimensional schematic diagram of the threaded sleeve of this utility model;

[0024] Figure 4 This is a three-dimensional schematic diagram of the check plate of this utility model.

[0025] [Explanation of Key Component Symbols]

[0026] 1. Device body; 2. Mounting groove; 3. Guide pipe; 4. Check plate; 401. Mounting plate; 402. Check groove; 403. Port; 404. Valve; 5. External threaded ring; 6. Threaded sleeve; 7. Sealing plate; 8. Gravity block; 9. Sealing ring one; 10. Annular groove one; 11. Sealing ring two; 12. Sealing groove two; 13. Circular plate; 14. Top plate; 15. Abutment block; 16. Handle; 17. Switch valve. Detailed Implementation

[0027] This utility model provides a backflow prevention device for bulk gas mixing.

[0028] Example 1, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4The device includes a main body 1, with two mounting slots 2 on the top of the main body 1. A guide pipe 3 is provided on one side of the main body 1, passing through the two mounting slots 2. A check plate 4 is fitted inside the mounting slot 2. An external threaded ring 5 is fixedly connected to the top of the main body 1 and at the corresponding position of each mounting slot 2. A threaded sleeve 6 is threaded on the outside of the external threaded ring 5. A sealing plate 7 is provided between the bottom of the threaded sleeve 6 and the check plate 4. The sealing plate 7 is located inside the external threaded ring 5.

[0029] Specifically, one end of the device body 1 needs to be connected to a gas booster pump to increase the amount of exhaust gas, making it easier to open the valve body 404. Since the gas booster pump is an existing technology, its specific form, usage and installation are all existing technologies, and this application will not elaborate on them. The guide pipe 3 is used to transport the mixed bulk gas. The bulk gas will pass through each installation slot 2. The two sets of check plates 4 are used together. They can be used separately or together to increase the gas check effect.

[0030] Please see Figure 2 and Figure 4 The check plate body 4 includes a mounting plate 401. A check groove 402 is provided on one side of the mounting plate 401. A through-hole 403 is formed on the inner wall of the check groove 402. A valve body 404 is rotatably connected to the inner wall of the check groove 402. The valve body 404 cooperates with the inner wall of the check groove 402.

[0031] Please see Figure 2 and Figure 4 The check groove 402 is inclined on one side of the inner wall of the opening 403, and a gravity block 8 is fixedly installed at the movable end of the valve body 404. The gravity block 8 is located on the side of the valve body 404 away from the opening 403.

[0032] Please see Figure 2 and Figure 4 A sealing ring 9 is fixedly provided on the side of the valve body 404 away from the gravity block 8. An annular groove 10 is formed in the check groove 402 at the corresponding position of the sealing ring 9. The annular groove 10 is located on the outside of the opening 403.

[0033] Specifically, when the valve body 404 is closed, a line contact seal is formed between the sealing ring-9 and the annular groove-10; the sealing ring-9 is made of FKM fluororubber.

[0034] Please see Figure 2 and Figure 4 A sealing ring 11 is fixedly sleeved on the outer side of the mounting plate 401, and a sealing groove 12 is formed at the corresponding position of the mounting groove 2 relative to the sealing ring 11.

[0035] Specifically, the sealing ring 11 and the sealing groove 12 are interference-fitted to form a 360° continuous sealing band; at the end face: a flexible graphite gasket can be added between the lower surface of the sealing plate 7 and the upper surface of the circular plate 13. After the threaded sleeve 6 is tightened, a compression is generated to achieve a secondary seal at the end face and prevent minor leakage.

[0036] Please see Figure 2 and Figure 4 The external threaded ring 5 has a circular plate 13 inside, which is located below the sealing plate 7. The bottom of the circular plate 13 is fixedly connected to a top plate 14. The top plate 14 has a groove at the corresponding position of the sealing ring 11, and the top plate 14 is adapted to the top opening of the mounting groove 2.

[0037] Please see Figure 1 , Figure 2 and Figure 3 The threaded sleeve 6 has an internal threaded groove at its bottom. A stop block 15 is fixedly connected to the top wall inside the internal threaded groove. The stop block 15 contacts the top of the sealing plate 7. A handle 16 distributed in a circular array is fixedly connected to the outside of the threaded sleeve 6.

[0038] Please see Figure 1 and Figure 2 Switch valves 17 are installed at both ends of the device body 1.

[0039] Working principle: When gas flows in from one end of the device body 1, the airflow pushes the valve 404 to open towards the port 403. The valve 404 overcomes the gravity of the gravity block 8 and opens the port 403, allowing the gas to pass smoothly through the check plate 4 and enter the downstream pipeline.

[0040] When the airflow stops or reverses, the gravity block 8 causes the valve 404 to fall rapidly under the action of gravity. The valve 404 fits against the inner wall of the check groove 402, and the sealing ring 9 is embedded in the annular groove 10 to form the first sealing barrier.

[0041] Meanwhile, the sealing ring 11 on the outer side of the mounting plate 401 and the sealing groove 12 in the mounting groove 2 fit together tightly to form a second sealing barrier, further enhancing the sealing effect and preventing gas backflow.

[0042] The threaded sleeve 6 is tightened by the internal thread and the external threaded ring 5. The abutment block 15 presses against the sealing plate 7. The sealing plate 7 further presses against the circular plate 13 and the top plate 14 to ensure that the check plate body 4 remains stable under the action of high pressure airflow, preventing loosening or displacement, and preventing gas leakage.

[0043] When maintenance or replacement of the check plate body 4 is required, simply loosen the threaded sleeve 6 and remove the sealing plate 7 and check plate body 4. The operation is simple and does not require disassembling the entire device, which greatly improves maintenance efficiency.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A backflow prevention device for bulk gas mixing, comprising a device body (1), characterized in that: The device body (1) has two mounting slots (2) on its top. A guide pipe (3) is provided on one side of the device body (1) through the two mounting slots (2). A check plate (4) is fitted inside the mounting slot (2). An external threaded ring (5) is fixedly connected to the top of the device body (1) at the corresponding position of each mounting slot (2). A threaded sleeve (6) is threaded on the outside of the external threaded ring (5). A sealing plate (7) is provided between the bottom of the threaded sleeve (6) and the check plate (4). The sealing plate (7) is located inside the external threaded ring (5).

2. The backflow prevention device for bulk gas mixing according to claim 1, characterized in that: The check plate body (4) includes a mounting plate (401), a check groove (402) is provided on one side of the mounting plate (401), a through opening (403) is formed on the inner wall of the check groove (402), and a valve body (404) is rotatably connected to the inner wall of the check groove (402), and the valve body (404) cooperates with the inner wall of the check groove (402).

3. The backflow prevention device for bulk gas mixing according to claim 2, characterized in that: The check groove (402) is inclined on one side of the inner wall of the opening (403), and a gravity block (8) is fixedly installed on the movable end of the valve body (404). The gravity block (8) is located on the side of the valve body (404) away from the opening (403).

4. The backflow prevention device for bulk gas mixing according to claim 3, characterized in that: A sealing ring (9) is fixedly provided on the side of the valve body (404) away from the gravity block (8). An annular groove (10) is formed at the corresponding position of the check groove (402) relative to the sealing ring (9). The annular groove (10) is located outside the opening (403).

5. A backflow prevention device for bulk gas mixing according to claim 4, characterized in that: A sealing ring 2 (11) is fixedly sleeved on the outside of the mounting plate (401), and a sealing groove 2 (12) is formed at the corresponding position of the mounting groove (2) relative to the sealing ring 2 (11).

6. The backflow prevention device for bulk gas mixing according to claim 1, characterized in that: The external threaded ring (5) has a circular plate (13) inside. The circular plate (13) is located below the sealing plate (7). A top plate (14) is fixedly connected to the bottom of the circular plate (13). The top plate (14) has a groove at the corresponding position of the sealing ring (11). The top plate (14) is adapted to the top opening of the mounting groove (2).

7. A backflow prevention device for bulk gas mixing according to claim 1, characterized in that: The threaded sleeve (6) has an internal threaded groove at its bottom. A stop block (15) is fixedly connected to the top wall inside the internal threaded groove. The stop block (15) is in contact with the top of the sealing plate (7). A handle (16) arranged in a circular array is fixedly connected to the outside of the threaded sleeve (6).

8. A backflow prevention device for bulk gas mixing according to claim 1, characterized in that: Switch valves (17) are installed at both ends of the device body (1).

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