Gas blow-by prevention structure and high-low pressure gas pipeline assembly

Abstract

The utility model discloses an anti-blow-by structure which comprises a connecting pipeline, a first ball valve, a pressure transmitting device, a pressure measuring device, a needle valve and a pressure detecting and alarming device. The connecting pipeline is sequentially connected with a first ball valve, a pressure transmitting device, a pressure measuring device and a needle valve, the first ball valve is close to the low-pressure gas pipeline, and the needle valve is close to the high-pressure gas pipeline; and the pressure change device is connected with a pressure detection alarm device. The utility model further discloses a high and low pressure gas pipeline assembly which comprises a low pressure gas pipeline, a high pressure gas pipeline and an anti-blow-by structure. The utility model has the beneficial effect that the connection safety and the use safety of the high-pressure pipeline and the low-pressure pipeline adjacent to each other are effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of high-pressure gas pipelines, and particularly to an anti-gas leakage structure for adjacent connection of high and low pressure gas pipelines. Background Art

[0002] In the high-pressure gas industry, due to significant differences in the media and pressures of various gases, it is common for high-pressure and low-pressure gas pipelines to be adjacent and connected to each other. For example, it is a common operation to use low-pressure nitrogen for purging in a high-pressure system. However, this operation method usually relies only on a single on-off valve for control, presenting significant safety hazards.

[0003] Gas leakage is likely to occur between high and low pressure gases. Once high-pressure gas invades the low-pressure pipeline through the valve, the low-pressure pipeline may burst due to its inability to withstand the high pressure. Such bursts not only lead to equipment shutdown and production interruption but may also trigger serious safety accidents such as explosions or harmful gas leaks. Especially in industries with extremely high safety requirements such as chemical engineering, petroleum, and natural gas, this risk is even more prominent.

[0004] In addition, gas leakage may also cause damage to other equipment in the system. For example, the sudden intrusion of high-pressure gas may cause an instantaneous impact on low-pressure equipment, resulting in increased equipment wear or direct damage, and increasing the maintenance and repair costs of the system. At the same time, chemical reactions may occur after the gases are mixed, producing harmful by-products, further increasing the safety hazards.

[0005] Therefore, how to effectively prevent gas leakage between high and low pressure gases and ensure the safety and reliability of the gas transmission system has become a technical problem to be solved urgently. This is not only related to the safety of equipment and personnel but also affects production efficiency and economic benefits. It is necessary to develop a reliable anti-gas leakage technology to ensure that when connecting a low-pressure gas pipeline to a high-pressure gas pipeline, the high and low pressure gases can be completely isolated, thus eliminating potential risks.

[0006] The information disclosed in this background art section is only intended to enhance the overall understanding of the utility model and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0007] The technical problem to be solved by the utility model is: how to solve the problem that gas leakage is likely to occur between high and low pressure gases currently, and once high-pressure gas invades the low-pressure pipeline through the valve, the low-pressure pipeline may burst due to its inability to withstand the high pressure.

[0008] The utility model realizes the solution of the above technical problem through the following technical means:

[0009] The anti-cavitation structure includes a connecting pipe, a first ball valve, a pressure transmitter, a pressure measuring device, a needle valve, and a pressure detection and alarm device;

[0010] The first ball valve, the pressure transmitter, the pressure measuring device, and the needle valve are sequentially connected to the connecting pipe. The first ball valve is close to the low-pressure gas pipeline, and the needle valve is close to the high-pressure gas pipeline;

[0011] The pressure change device is connected to the pressure detection and alarm device.

[0012] In the present utility model, before supplying gas from the low-pressure gas to the high-pressure gas pipeline, first observe whether the reading of the pressure measuring device is within the specified range. If the pressure is normal and within the specified range, the low-pressure gas supply operation can be carried out. After the pressure in the high-pressure gas pipeline is released, first open the first ball valve and observe that the pressure indication is equal to the pressure of the low-pressure gas supply source. After confirming that there is no error, open the needle valve, and then the low-pressure gas can be supplied into the high-pressure gas pipeline for purging or protection; if the needle valve leaks after long-term use and the high-pressure gas gradually leaks to the low-pressure side, the value of the pressure measuring device on-site will change at this time, which is convenient for on-site inspection personnel to find problems in time. If the on-site inspection personnel do not find this problem, the pressure transmitter will transmit the pressure to the pressure detection and alarm device. When the pressure detection and alarm device receives the information that the pressure exceeds the set value, it will issue a safety sound and light alarm to remind the on-site and control room operators. The present utility model effectively improves the connection safety and use safety of the high and low pressure pipelines at the adjacent part.

[0013] Preferably, it further includes a check valve, which is connected to the connecting pipe, and the check valve is located between the pressure measuring device and the needle valve.

[0014] When conventional high-pressure gas is in use, the needle valve is in a closed state. When the needle valve leaks or is abnormally damaged, the check valve can effectively prevent the high-pressure gas from surging into the low-pressure gas pipeline, avoiding the problem that the valve failure causes the high-pressure gas to enter the low-pressure side and leads to damage to the pipeline or components; at the same time, the check valve can effectively avoid the problem that the high-pressure gas enters the low-pressure side due to the misoperation of the needle valve not being closed.

[0015] Preferably, it further includes a safety relief valve, which is connected to the connecting pipe, and the safety relief valve is located between the pressure measuring device and the needle valve.

[0016] If the pressure sound and light alarm device also fails, once the pressure in the pipeline exceeds 1.15 times the operating pressure of the low-pressure gas pipeline, the safety relief valve will open to discharge the high-pressure gas to prevent overpressure in the pipeline and further ensure the safety of the pipeline and components.

[0017] Preferably, the pressure measuring device is a pressure gauge.

[0018] Preferably, the pressure transmitter is connected to the pressure detection alarm device via a signal line.

[0019] Preferably, the pressure detection alarm device includes an audible and visual alarm.

[0020] Preferably, the first ball valve is detachably connected to the connecting pipe.

[0021] Since the gas pipeline used at the high-pressure end is thick and difficult to move, and the connection methods of high-pressure components are relatively difficult to disassemble, a valve that is easy to disassemble and assemble is set on the low-pressure gas pipeline side. When the first ball valve 21 needs to be disassembled or tightened in an abnormal situation, it does not need to move the pipeline and can be directly removed from the panel, which can provide sufficient maintenance space and avoid stress caused by bending the pipeline during disassembly, which may cause leakage at other connection points.

[0022] The present invention also discloses a high- and low-pressure gas pipeline assembly, comprising a low-pressure gas pipeline, a high-pressure gas pipeline, and the above-mentioned anti-gas blowby structure, wherein both ends of the connecting pipeline are respectively connected to the low-pressure gas pipeline and the high-pressure gas pipeline.

[0023] The advantages of the utility model are:

[0024] In the utility model, before supplying low-pressure gas to the high-pressure gas pipeline, first observe whether the indication of the pressure measuring device is within the specified range. If the pressure display is normal and within the specified range, the low-pressure gas supply operation can be carried out. After the pressure discharge of the high-pressure gas pipeline is completed, first open the first ball valve to observe whether the pressure indication is equal to the pressure of the low-pressure gas supply source. After confirming that it is correct, open the needle valve, and the low-pressure gas can be supplied to the high-pressure gas pipeline for purging or protection; if the needle valve leaks after long-term use, the high-pressure gas gradually leaks to the low-pressure side. At this time, the value of the pressure measuring device on site will change, which is convenient for the on-site inspection personnel to find the problem in time. If the on-site inspection personnel do not find this problem, the pressure transmitter will transmit the pressure to the pressure detection alarm device. When the pressure detection alarm device receives the information that the pressure exceeds the set value, it will send a safety sound and light alarm to remind the operators on site and in the control room. The utility model effectively improves the connection safety and use safety of high and low pressure pipelines in adjacent places.

[0025] When conventional high-pressure gas is in use, the needle valve is in a closed state. When the needle valve leaks or is abnormally damaged, the one-way valve can effectively prevent the high-pressure gas from flowing into the low-pressure gas pipeline, thereby preventing the high-pressure gas from entering the low-pressure side due to valve failure, causing damage to the pipeline or parts. At the same time, the one-way valve can effectively prevent the problem of high-pressure gas entering the low-pressure side due to the needle valve not being closed due to misoperation.

[0026] If the pressure sound and light alarm device also fails, once the pipeline pressure exceeds 1.15 times the operating pressure of the low-pressure gas pipeline, the safety relief valve will open to discharge the high-pressure gas to prevent overpressure in the pipeline and further ensure the safety of the pipeline and components.

[0027] Since the gas pipeline used at the high-pressure end is thick and difficult to move, and the connection methods of high-pressure parts are relatively difficult to disassemble, a valve that is easy to disassemble and assemble is set on the low-pressure gas pipeline side. When the first ball valve needs to be disassembled or tightened in an abnormal situation, it does not need to move the pipeline and can be directly removed from the panel, which can provide sufficient maintenance space and avoid stress caused by bending the pipeline during the disassembly process, which may cause leakage at other connection points. By setting up easy-to-disassemble parts, the maintenance margin is increased when repairing parts.

[0028] The utility model effectively improves the connection safety and use safety of high and low pressure pipelines in adjacent places by setting reliable non-return measures, safety interlocking protection measures and safety release measures, greatly reduces the possibility of accidents, and improves use safety and maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a high and low pressure gas pipeline assembly according to an embodiment of the utility model;

[0030] Numbers in the figure:

[0031] 1. Low-pressure gas pipeline; 2. Connecting pipeline; 21. First ball valve; 22. Pressure transmitter; 23. Pressure measuring device; 24. Safety pressure relief valve; 25. Check valve; 26. Needle valve; 3. High-pressure gas pipeline; 4. Signal line; 5. Pressure detection alarm device. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Embodiment 1:

[0034] like Figure 1As shown, the anti-gas blowby structure is connected between the low-pressure gas pipeline 1 and the high-pressure gas pipeline 3, including a connecting pipeline 2 connected between the low-pressure gas pipeline 1 and the high-pressure gas pipeline 3, a first ball valve 21, a pressure transmitter 22, a pressure measuring device 23, a safety pressure relief valve 24, a one-way valve 25, and a needle valve 26 arranged in sequence on the connecting pipeline 2; the pressure transmitter 22 is connected to the pressure detection alarm device 5 through a signal line 4.

[0035] The pressure measuring device 23 is a pressure gauge. The pressure transmitting device 22 is a pressure transmitter.

[0036] Gas supply: Before supplying low-pressure gas to the high-pressure gas pipeline 3, first observe whether the indication of the pressure gauge is within the specified range. If the pressure display is normal and within the specified range, the low-pressure gas supply operation can be carried out. After the pressure of the high-pressure gas pipeline 3 is released, first open the first ball valve 21 and observe whether the pressure indication is equal to the pressure of the low-pressure gas supply source. After confirming that it is correct, open the needle valve 26 to supply low-pressure gas to the high-pressure gas pipeline 3 for purging or protection.

[0037] Promote safe use: When conventional high-pressure gas is in use, the needle valve 26 is in a closed state. When the needle valve 26 leaks or is abnormally damaged, the one-way valve 25 can effectively prevent the high-pressure gas from flowing into the low-pressure gas pipeline 1, thereby preventing the high-pressure gas from entering the low-pressure side due to valve failure, causing damage to the pipeline or parts; at the same time, the one-way valve 25 can effectively prevent the high-pressure gas from entering the low-pressure side due to the needle valve 26 not being closed due to misoperation.

[0038] If the needle valve 26 and the one-way valve 25 leak after long-term use, the high-pressure gas will gradually leak to the low-pressure side. At this time, the value of the pressure gauge on site will change, which will facilitate on-site inspection personnel to find the problem in time. If the on-site inspection personnel do not find this problem, the pressure transmitter 22 will transmit the pressure to the pressure detection alarm device 5 through the signal line 4. When the pressure detection alarm device 5 receives the information that the pressure exceeds the set value, it will issue a safety sound and light alarm to remind the operators on site and in the control room. If the pressure sound and light alarm device also fails, once the pipeline pressure exceeds 1.15 times the operating pressure of the low-pressure gas pipeline 1, the safety relief valve 24 will open to discharge the high-pressure gas to prevent overpressure in the pipeline and further ensure the safety of the pipeline and components.

[0039] This embodiment discloses a high- and low-pressure gas pipeline assembly, including a low-pressure gas pipeline 1, a high-pressure gas pipeline 3, and the anti-gas cross-talk structure in the above-mentioned embodiment 1, and the two ends of the connecting pipeline 2 are connected to the low-pressure gas pipeline 1 and the high-pressure gas pipeline 3 respectively.

[0040] In this embodiment, the gas in the low-pressure gas pipeline 1 is 0.8 MPa, and the gas in the high-pressure gas pipeline 3 is 20 MPa.

[0041] In this embodiment, the needle valve 26 can effectively prevent large-scale gas leakage, and the one-way valve 25 can effectively prevent high-pressure gas from leaking into the low-pressure pipeline due to misoperation or valve leakage. The newly added pressure gauge and pressure transmitter can effectively detect the problem of high-pressure gas leakage; the pipeline is added with a safety pressure relief valve, which can automatically leak high-pressure gas through hardware even if a problem is found in place, preventing the pressure in the low-pressure pipeline from causing damage to the pipeline and parts; easy-to-disassemble parts are set on the low-pressure pipeline to increase the space margin during maintenance, effectively reduce the difficulty of maintenance, and improve maintenance efficiency. This embodiment effectively improves the connection safety and use safety of high and low pressure pipelines in adjacent outlets by setting reliable non-return measures, safety interlocking protection measures and safety release measures.

[0042] Embodiment 2:

[0043] In this embodiment, the first ball valve 21 is detachably connected to the connecting pipe 2. The first ball valve 21 is a VCO-type ring sealing ball valve.

[0044] Since the gas pipeline used at the high-pressure end is thick and difficult to move, and the connection methods of high-pressure components are relatively difficult to disassemble, a valve that is easy to disassemble and assemble is set on the side of the low-pressure gas pipeline 1. When the first ball valve 21 needs to be disassembled or tightened in an abnormal situation, it does not need to move the pipeline and can be directly removed from the panel, which can provide sufficient maintenance space and avoid stress caused by bending the pipeline during the disassembly process, causing leakage at other connection points.

[0045] This embodiment increases the maintenance margin when repairing parts by providing easy-to-disassemble parts.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Anti-gas blowby structure, characterized in that: It includes a connecting pipeline, a first ball valve, a pressure transmitter, a pressure measuring device, a needle valve, and a pressure detection alarm device; The connecting pipeline is connected in sequence to a first ball valve, a pressure transmitter, a pressure measuring device, and a needle valve, wherein the first ball valve is close to the low-pressure gas pipeline, and the needle valve is close to the high-pressure gas pipeline; The pressure variation device is connected to the pressure detection alarm device.

2. The anti-gas blowby structure according to claim 1, characterized in that: It also includes a one-way valve, which is connected to the connecting pipeline and is located between the pressure measuring device and the needle valve.

3. The anti-gas blowby structure according to claim 1, characterized in that: It also includes a safety relief valve, which is connected to the connecting pipeline and is located between the pressure measuring device and the needle valve.

4. The anti-gas blowby structure according to claim 1, characterized in that: The pressure measuring device is a pressure gauge.

5. The anti-gas blowby structure according to claim 1, characterized in that: The pressure transmitter is connected to the pressure detection alarm device via a signal line.

6. The anti-gas blowby structure according to claim 1, characterized in that: The pressure detection alarm device includes an audible and visual alarm.

7. The anti-gas blowby structure according to claim 1, characterized in that: The first ball valve is detachably connected to the connecting pipe.

8. High and low pressure gas pipeline assembly, characterized in that: It comprises a low-pressure gas pipeline, a high-pressure gas pipeline, and the anti-gas blowby structure of any one of claims 1 to 7, and the two ends of the connecting pipeline are respectively connected to the low-pressure gas pipeline and the high-pressure gas pipeline.

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