Oxygen feeding pipe with double-isolation emptying valve

Abstract

The utility model discloses an oxygen feeding pipe with double isolation emptying valves, and relates to the technical field of chemical safety valves and pipeline assemblies. The double-isolation emptying valve comprises a double-isolation emptying valve body, connecting pipes are connected to the two sides of the double-isolation emptying valve body, oxygen pipes are arranged at the two ends of each connecting pipe respectively, and connecting pieces are arranged between the connecting pipes and the oxygen pipes. A first elastic plugging piece is arranged in the connecting pipe, a second elastic plugging piece is arranged in the oxygen pipe, and an extrusion rod corresponding to the first elastic plugging piece is arranged on the second elastic plugging piece. The double-isolation emptying valve body is arranged on the oxygen pipe, so that double isolation and emptying control in the oxygen feeding process can be realized, and when oxygen needs to be conveyed, the double-isolation emptying valve body can ensure that the oxygen stably flows from the oxygen pipe on one side to the oxygen pipe on the other side through the connecting pipe.

Description

Technical Field

[0001] This utility model belongs to the field of chemical safety valves and pipeline components, specifically, it relates to an oxygen feed pipe with a double isolation vent valve. Background Technology

[0002] Polyphenylene oxide (PPO) is typically produced by oxidative coupling polymerization of 2,6-dimethylphenol in the presence of oxygen using a copper / amine complex catalytic system. The process medium often contains organic solvents (such as toluene). Oxygen is introduced into the stirred reactor continuously or intermittently. Published patents describe the hardware arrangement of the gas and liquid inlets. Toluene is a highly flammable liquid; its vapor can form an explosive mixture with air. NIOSH and OSHA data list the explosive limits of toluene as approximately 1.1% LEL and 7.1% UEL. In this scenario, preventing backflow of reactor-side media (toluene vapor, liquid, or catalyst-containing mixtures) into the oxygen pipeline network is an intrinsically safe measure. Industry guidelines specify dedicated design and backflow prevention engineering requirements for oxygen pipelines and systems, including the installation of check valves and backflow prevention devices in cases of shared or mixed purging lines, and the use of materials and cleaning standards suitable for oxygen services. However, in chemical intrinsically safe management systems, oxygen pipelines are considered high-risk control targets. If organic matter (such as toluene) flows back into the high-pressure oxygen pipeline network, it can easily create an oxygen-rich combustion environment inside the pipeline. Under the friction of high-speed airflow or static electricity, it can trigger a flash explosion or even a detonation inside the pipeline. Such accidents are often characterized by their suddenness and great destructive power. They can not only cause pipeline rupture and material leakage, but may also affect the reactor and surrounding equipment, posing a catastrophic threat to the overall safe production of the chemical plant.

[0003] However, existing backflow prevention devices still have some shortcomings in practical applications. Some check valves and backflow prevention devices have a single protection level and lack fault tolerance mechanisms. Conventional designs often rely excessively on a single check valve or one-way flame arrestor structure. However, during long-term operation, the check valve sealing surface is prone to internal leakage due to carbon buildup, wear, or foreign object blockage, leading to increased maintenance costs and reduced reliability. In addition, under different operating conditions, such as large changes in temperature and pressure, the performance of existing backflow prevention devices may be affected, failing to meet the requirements for backflow prevention. Moreover, accidents in chemical plants often occur under abnormal operating conditions, especially during shutdown maintenance or equipment upkeep. During maintenance, reactors and pipelines often need to be disassembled or removed. At this time, the original pressure balance system is broken. If there is a lack of reliable physical isolation measures, residual flammable vapors or liquids can easily diffuse and overflow during maintenance, causing secondary accidents.

[0004] In view of this, this utility model is hereby proposed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an oxygen feeding pipe with a double isolation vent valve, which solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] An oxygen feed pipe with a double isolation vent valve includes: a double isolation vent valve body, with connecting pipes connected to both sides of the double isolation vent valve body, oxygen pipes respectively provided at both ends of the connecting pipes, and a connector provided between the connecting pipes and the oxygen pipes;

[0008] The connecting pipe is provided with a first elastic sealing element, and the oxygen pipe is provided with a second elastic sealing element. The second elastic sealing element is provided with a compression rod corresponding to the first elastic sealing element.

[0009] Optionally, the connector includes a first connecting flange disposed at the end of the connecting pipe and a second connecting flange disposed inside the oxygen pipe and corresponding to the first connecting flange.

[0010] Optionally, the first elastic sealing member includes a first blocking ring disposed inside the connecting pipe, a first sealing head located inside the connecting pipe and abutting against the first blocking ring, a first fixing plate disposed at the opening of the connecting pipe, and a first tension spring disposed between the first fixing plate and the first sealing head.

[0011] Optionally, the second elastic sealing member includes a second blocking ring disposed inside the oxygen tube, a second sealing head located inside the oxygen tube and abutting against the second blocking ring, a second fixing plate disposed inside the oxygen tube, a second tension spring disposed between the second fixing plate and the second blocking ring, and the compression rod disposed on one side of the second fixing plate.

[0012] Optionally, both the first sealing head and the second sealing head have a chamfer on one side that abuts against the first blocking ring and the second blocking ring.

[0013] Optionally, a through hole corresponding to the extrusion rod is provided on one side of the first fixing plate.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0015] By installing a double-isolation vent valve on the oxygen pipe, dual isolation and venting control of the oxygen feeding process can be achieved. When oxygen needs to be delivered, the double-isolation vent valve ensures that oxygen flows stably from one oxygen pipe to the other through the connecting pipe. The first and second elastic sealing elements are in the appropriate positions during normal delivery to ensure smooth oxygen flow. When venting is required, the double-isolation vent valve can quickly cut off the oxygen delivery path, safely releasing excess oxygen and avoiding safety hazards caused by excessive pressure in the pipeline. Simultaneously, the corresponding arrangement of the squeeze rod and the first elastic sealing element ensures that oxygen... During gas delivery and venting, the two processes work together to further enhance the effect of double-isolation venting. When the pressure inside the pipeline changes, the squeezing rod exerts a corresponding force on the first elastic sealing element, prompting it to make adaptive adjustments. This precisely controls the flow rate and direction of oxygen, improving the stability and reliability of the entire oxygen feeding pipeline system. This double-isolation venting design also effectively prevents oxygen leakage and reduces the risk of residual flammable vapors or liquids easily diffusing and overflowing during maintenance, which could lead to secondary accidents. It provides a safer guarantee for the oxygen feeding process and is suitable for various industrial scenarios with high requirements for oxygen delivery.

[0016] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0018] Fig. 1 This is a schematic diagram of a dual-isolation vent valve structure.

[0019] Fig. 2 This is a schematic diagram of the sealing head structure;

[0020] Fig. 3 This is a schematic diagram of an oxygen tube structure.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] The system includes a double-isolation vent valve body 1, a connecting pipe 2, an oxygen pipe 3, a connector 6, a first connecting flange 601, a second connecting flange 602, a first elastic sealing element 7, a first blocking ring 701, a first sealing head 702, a first fixing plate 703, a first tension spring 704, a second elastic sealing element 8, a second blocking ring 801, a second sealing head 802, a second fixing plate 803, a second tension spring 804, a compression rod 9, and a through hole 10.

[0023] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings.

[0025] Please see Figs. 1-3 As shown, this embodiment provides an oxygen feeding pipe with a double isolation vent valve, including: a double isolation vent valve body 1, connecting pipes 2 connected to both sides of the double isolation vent valve body 1, oxygen pipes 3 respectively provided at both ends of the connecting pipes 2, and a connector 6 provided between the connecting pipes 2 and the oxygen pipes 3.

[0026] A first elastic sealing element 7 is provided inside the connecting pipe 2, and a second elastic sealing element 8 is provided inside the oxygen pipe 3. A compression rod 9 corresponding to the first elastic sealing element 7 is provided on the second elastic sealing element 8.

[0027] By installing a double-isolation vent valve 1 on the oxygen pipe 3, dual isolation and venting control of the oxygen feeding process can be achieved. When oxygen needs to be delivered, the double-isolation vent valve 1 ensures that oxygen flows stably from one side of the oxygen pipe 3 through the connecting pipe 2 to the other side of the oxygen pipe 3. The first elastic sealing element 7 and the second elastic sealing element 8 are in the appropriate positions during normal delivery to ensure smooth oxygen flow. When venting is required, the double-isolation vent valve 1 can quickly cut off the oxygen delivery path and safely release excess oxygen, avoiding safety hazards caused by excessive pressure in the pipeline. At the same time, the corresponding arrangement of the squeeze rod 9 and the first elastic sealing element 7... This design allows for coordinated operation between the oxygen supply and venting processes, further enhancing the effectiveness of the dual-isolation venting system. When the pressure inside the pipeline changes, the extrusion rod 9 exerts a corresponding force on the first elastic sealing element 7, prompting it to make adaptive adjustments. This precisely controls the oxygen flow rate and direction, improving the stability and reliability of the entire oxygen supply pipeline system. This dual-isolation venting design also effectively prevents oxygen leakage and reduces the risk of residual flammable vapors or liquids easily diffusing and overflowing during maintenance, thus preventing secondary accidents. It provides a safer guarantee for the oxygen supply process and is suitable for various industrial scenarios with high oxygen supply requirements.

[0028] like Fig. 1 As shown, the connector 6 in this embodiment includes a first connecting flange 601 disposed at the end of the connecting pipe 2 and a second connecting flange 602 disposed inside the oxygen pipe 3 and corresponding to the first connecting flange 601.

[0029] The first connecting flange 601 and the second connecting flange 602 are connected by multiple evenly distributed bolts. These bolts provide a stable and reliable tightening force, ensuring a tight and seamless connection between the connecting pipe 2 and the oxygen pipe 3. A sealing gasket is also provided between the mating surfaces of the first connecting flange 601 and the second connecting flange 602. The sealing gasket is made of high-pressure resistant and corrosion-resistant rubber material, which can effectively prevent oxygen leakage at the connection point, further improving the sealing performance and safety of the entire oxygen feeding pipe system.

[0030] like Figs. 2-3 As shown, the first elastic sealing member 7 in this embodiment includes a first blocking ring 701 disposed inside the connecting pipe 2, a first sealing head 702 located inside the connecting pipe 2 and abutting against the first blocking ring 701, a first fixing plate 703 disposed at the opening of the connecting pipe 2, and a first tension spring 704 disposed between the first fixing plate 703 and the first sealing head 702; the second elastic sealing member 8 includes a second blocking ring 801 disposed inside the oxygen pipe 3, a second sealing head 802 located inside the oxygen pipe 3 and abutting against the second blocking ring 801, a second fixing plate 803 disposed inside the oxygen pipe 3, and a second tension spring 804 disposed between the second fixing plate 803 and the second blocking ring 801; a compression rod 9 is disposed on one side of the second fixing plate 803; both the first sealing head 702 and the second sealing head 802 have chamfers on one side that abut against the first blocking ring 701 and the second blocking ring 801; a through hole 10 corresponding to the compression rod 9 is opened on one side of the first fixing plate 703.

[0031] When oxygen enters from oxygen pipe 3, due to the pressure, the oxygen will push the second sealing head 802 to overcome the tension of the second tension spring 804 and separate it from the second blocking ring 801. At this time, the oxygen can pass smoothly through oxygen pipe 3. At the same time, as the second sealing head 802 moves, the extrusion rod 9 set on one side of the second fixed plate 803 will pass through the through hole 10 opened on the first fixed plate 703, thereby pushing the first sealing head 702 to overcome the tension of the first tension spring 704 and separate it from the first blocking ring 701. In this way, oxygen can continue to be delivered through connecting pipe 2.

[0032] When oxygen supply stops, the first tension spring 704 and the second tension spring 804 will function. The first tension spring 704 will pull the first sealing head 702 to re-engage with the first blocking ring 701, and the second tension spring 804 will pull the second sealing head 802 to re-engage with the second blocking ring 801. Since both the first sealing head 702 and the second sealing head 802 have chamfers on one side that abut against the first blocking ring 701 and the second blocking ring 801, this design makes the sealing tighter, effectively preventing oxygen leakage and providing good isolation. Moreover, this structure of the double isolation vent valve makes oxygen supply safer and more reliable. In case of abnormality, the two elastic sealing elements can cut off the oxygen supply path in time to avoid danger. In addition, this structure is relatively simple, easy to install and maintain, reduces the cost of use and maintenance difficulty, and has high practicality and promotion value in practical applications.

[0033] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. An oxygen feed pipe with dual isolation vent valves, characterized in that, include: A double-isolation vent valve body (1) is provided with connecting pipes (2) on both sides of the double-isolation vent valve body (1), and oxygen pipes (3) are respectively provided at both ends of the connecting pipes (2). A connector (6) is provided between the connecting pipes (2) and the oxygen pipes (3). The connecting pipe (2) is provided with a first elastic sealing element (7), and the oxygen pipe (3) is provided with a second elastic sealing element (8). The second elastic sealing element (8) is provided with a compression rod (9) corresponding to the first elastic sealing element (7).

2. An oxygen feed pipe with a double isolation vent valve according to claim 1, characterized in that, The connector (6) includes a first connecting flange (601) disposed at the end of the connecting pipe (2) and a second connecting flange (602) disposed inside the oxygen pipe (3) and corresponding to the first connecting flange (601).

3. An oxygen feed pipe with dual isolation vent valves according to claim 1, characterized in that, The first elastic sealing member (7) includes a first blocking ring (701) disposed inside the connecting pipe (2), a first sealing head (702) located inside the connecting pipe (2) and abutting against the first blocking ring (701), a first fixing plate (703) disposed at the opening of the connecting pipe (2), and a first tension spring (704) disposed between the first fixing plate (703) and the first sealing head (702).

4. An oxygen feed pipe with a double isolation vent valve according to claim 3, characterized in that, The second elastic sealing member (8) includes a second blocking ring (801) disposed inside the oxygen pipe (3), a second sealing head (802) located inside the oxygen pipe (3) and abutting against the second blocking ring (801), a second fixing plate (803) disposed inside the oxygen pipe (3), a second tension spring (804) disposed between the second fixing plate (803) and the second blocking ring (801), and the compression rod (9) disposed on one side of the second fixing plate (803).

5. An oxygen feed pipe with dual isolation vent valves according to claim 4, characterized in that, Both the first sealing head (702) and the second sealing head (802) have a chamfer on one side that abuts against the first blocking ring (701) and the second blocking ring (801).

6. An oxygen feed pipe with dual isolation vent valves according to claim 3, characterized in that, The first fixing plate (703) has a through hole (10) on one side corresponding to the extrusion rod (9).

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