Pipeline isolation device

Abstract

The utility model provides a pipeline isolating device. The pipeline isolating device comprises a fixed plate and a movable plate which are arranged at an interval, the transmission rod penetrates through the movable plate and the fixed plate, and the transmission rod is rotatably connected with the fixed plate and movably connected with the movable plate; the locking nut is fixedly connected with the movable plate and is in threaded connection with the transmission rod; the flexible sealing element is wound on the transmission rod between the movable plate and the fixed plate; the gas sensor is mounted on the transmission rod on one side, far away from the fixed plate, of the movable plate; the alarm is mounted on the transmission rod on one side, far away from the fixed plate, of the movable plate; the input end of the controller is in communication connection with the output end of the gas sensor, and the output end of the controller is in communication connection with the input end of the alarm. By the adoption of the system, the inert gas replacement time of the system is greatly shortened, energy waste is reduced, and manpower and material resources are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline construction, in particular to a pipeline isolation device. Background Art

[0002] Petrochemical production enterprises, from raw materials to products, including semi-finished products, intermediates, solvents, additives, catalysts, reagents, etc. in the process, most of them are flammable, explosive, toxic and harmful substances. They mostly exist in gas and liquid states and are very easy to leak and volatilize. The production of petrochemical products has many production processes and is complex. With the increasing demand for product variety and quantity, petrochemical enterprises are forced to develop towards large-scale modern joint enterprises to improve the depth of processing.

[0003] The production of petrochemical enterprises is highly continuous, regardless of day or night, holidays, and long-term continuous shift work. Within an enterprise, the pipelines between workshops are interconnected, and the raw materials and products are mutually utilized. It is a tightly organized, interdependent, highly unified and inseparable organic whole. An accident in any workshop or process will affect the overall situation. If there are defects in equipment or pipelines in a certain section, the system must be shut down immediately. Because hot work is required to eliminate defects, the system must be replaced with inert gas to prevent flammable, toxic and harmful gases from exceeding the standard, causing fire, explosion and personal injury accidents.

[0004] At present, when a defect is found in a certain section of pipeline, the system is shut down, the materials in the entire system pipeline are emptied, and then the flammable, toxic and harmful gases in the pipeline are completely replaced with inert gases. After the detected gas composition is completely qualified and meets the safety standard for long-term inhalation by personnel, welding operations and other hot work operations are performed on the defective position. Generally, it takes about 3-4 days to shut down the system for replacement. The long system shutdown time greatly affects the system operation efficiency. Utility Model Content

[0005] In view of this, the utility model provides a pipeline isolation device to solve the above technical problems.

[0006] The pipeline isolation device provided by the utility model comprises:

[0007] Fixed plates and movable plates arranged at intervals;

[0008] A transmission rod, the transmission rod passes through the movable plate and the fixed plate, the transmission rod is rotatably connected to the fixed plate, and is movably connected to the movable plate;

[0009] A locking nut, the locking nut is fixedly connected to the movable plate and is threadedly connected to the transmission rod;

[0010] a flexible seal, the flexible seal being wound around the transmission rod between the movable plate and the fixed plate;

[0011] A gas sensor, wherein the gas sensor is mounted on the transmission rod at a side of the movable plate away from the fixed plate;

[0012] An alarm, the alarm being mounted on the transmission rod on a side of the movable plate away from the fixed plate;

[0013] A controller, wherein an input end of the controller is communicatively connected to an output end of the gas sensor, and an output end of the controller is communicatively connected to an input end of the alarm.

[0014] Optionally, the pipeline isolation device further comprises: an annular airbag, wherein the annular airbag is sleeved with the locking nut.

[0015] Optionally, the pipeline isolation device further includes: an air storage tank, the air storage tank is connected to the annular airbag via an inflation pipeline, and a valve is installed on the inflation pipeline.

[0016] Optionally, the pipeline isolation device also includes: an air pump, which is installed on the inflation pipeline.

[0017] Optionally, a handle is fixed to one end of the transmission rod away from the fixing plate.

[0018] Optionally, the pipeline isolation device further comprises: a driving assembly, wherein the driving assembly is drivingly connected to an end of the transmission rod away from the fixing plate to drive the transmission rod to reciprocate.

[0019] Optionally, a groove is provided on the side wall of the transmission rod, and the alarm is arranged in the groove.

[0020] Optionally, the movable plate, the fixed plate and the transmission rod are coaxially arranged.

[0021] Optionally, the transmission rod is provided with a length scale value.

[0022] Optionally, the flexible sealing element is a graphite packing.

[0023] Compared with the prior art, the above technical solution provided by the utility model has at least the following beneficial effects:

[0024] By adopting the pipeline isolation device of the utility model, when the concentration of flammable, toxic and harmful gases meets the level that will not harm the health of personnel after short-term inhalation, the inert gas replacement of the system pipeline can be stopped, one end of the fixed plate of the device is inserted into the upstream of a section of pipeline where the defective position exists, and the pipeline is sealed by utilizing the extrusion deformation of the flexible sealing member, and then the hot work can be carried out. There is no need to replace the inert gas of the system pipeline until the level that will not cause harm to personnel after long-term inhalation is met, which greatly shortens the inert gas replacement time of the system, reduces the waste of energy, and saves manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of a pipeline isolation device according to an embodiment of the utility model;

[0026] Figure 2 for Figure 1 Schematic diagram showing the pipeline isolation device in use.

[0027] Reference numerals:

[0028] 1: Fixed plate; 2: Movable plate; 3: Transmission rod; 4: Locking nut; 5: Flexible seal; 6: Handle. DETAILED DESCRIPTION

[0029] The embodiments of the utility model will be further described below in conjunction with the accompanying drawings. In the description of the utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only a simplified description for the convenience of describing the utility model, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0030] Figure 1 This is a schematic diagram of a pipeline isolation device according to an embodiment of the utility model; Figure 2 for Figure 1 The schematic diagram of the pipeline isolation device in use is shown in FIG. Figure 1 and Figure 2 As shown, the pipeline isolation device includes a fixed plate 1 and a movable plate 2 arranged at intervals, a transmission rod 3, a locking nut 4, a flexible seal 5, a gas sensor (not shown), an alarm (not shown) and a controller (not shown).

[0031] The transmission rod 3 passes through the movable plate 2 and the fixed plate 1, the transmission rod 3 is rotatably connected to the fixed plate 1, and is movably connected to the movable plate 2; the locking nut 4 is fixedly connected to the movable plate 2, and is threadedly connected to the transmission rod 3; the flexible sealing member 5 is wound around the transmission rod 3 between the movable plate 2 and the fixed plate 1; the gas sensor is mounted on the transmission rod 3 on the side of the movable plate 2 away from the fixed plate 1; the alarm is mounted on the transmission rod 3 on the side of the movable plate 2 away from the fixed plate 1; the input end of the controller is communicatively connected to the output end of the gas sensor, and the output end of the controller is communicatively connected to the input end of the alarm.

[0032] When there is a defective leak in the pipeline of a certain process of a petrochemical enterprise, the device is stopped, and the materials in the pipeline are emptied, and then inert gas replacement is performed. The flammable, toxic and harmful gases in the pipeline do not need to be completely replaced. It is only necessary to detect that the concentration of flammable, toxic and harmful gases reaches the set concentration value to ensure that the health of personnel will not be harmed after a short inhalation. At this time, the end flange of a section of the pipeline with defects is disassembled, and the transmission rod 3 is held by hand, and one end of the fixed plate 1 and the movable plate 2 is extended into the pipeline, and stopped at the upstream material direction of the defective position of the pipeline. The gas sensor monitors the gas concentration of the flammable, toxic and harmful gases in the pipeline in real time, and transmits the monitored gas concentration data to the controller. The controller has a gas concentration threshold pre-stored inside, and the gas concentration threshold is lower than the set concentration value of the flammable, toxic and harmful gases when the inert gas replacement is stopped. Therefore, after one end of the fixed plate 1 is inserted into the pipeline, the gas concentration data monitored by the gas sensor on the transmission rod 3 is greater than the gas concentration threshold pre-stored inside the controller, and the controller controls the alarm to sound an alarm. At this time, the transmission rod 3 is rotated, and the transmission rod 3 rotates relative to the fixed plate 1. Since the locking nut 4 is threadedly connected to the transmission rod 3, the locking nut 4 drives the movable plate 2 fixedly connected thereto to move linearly relative to the transmission rod 3 toward the fixed plate 1. When the movable plate 2 moves toward the fixed plate 1, the distance between the two gradually decreases, thereby squeezing the flexible seal 5 between the two. The flexible seal 5 is squeezed and diffused to the surroundings. When the movable plate 2 moves to a certain position, the flexible seal 5 is squeezed and diffused to tightly abut the circumferential inner wall of the pipeline, and completely fills all gaps between the fixed plate 1, the movable plate 2 and the inner wall of the pipeline, achieving the effect of sealing and isolation. At this time, the defective position is completely isolated from the upstream pipeline and equipment, and the gas in the upstream pipeline no longer continues to flow into the pipeline on the side of the movable plate 2 facing away from the fixed plate 1. The gas concentration data monitored by the gas sensor is less than or equal to the gas concentration threshold. The controller controls the alarm to stop sounding the alarm. At this time, the hot work is started, and welding and other leak repair operations are performed on the defective position of the pipeline. After the hot work is completed, the transmission rod 3 is rotated in the opposite direction, and the locking nut 4 drives the movable plate 2 connected thereto to move along the transmission rod 3 away from the fixed plate 1. After the flexible sealing member 5 loses the squeezing effect of the movable plate 2, it recovers its deformation and no longer tightly abuts against the inner wall of the pipeline. At this time, the transmission rod 3 is pulled outward to make the pipeline isolation device leave the pipeline as a whole.

[0033] By adopting the pipeline isolation device of the utility model, when the concentration of flammable, toxic and harmful gases meets the level that will not harm the health of personnel after short-term inhalation, the inert gas replacement of the system pipeline can be stopped, and one end of the fixed plate 1 of the device is inserted into the upstream of a section of pipeline where the defective position exists, and the pipeline is sealed by the extrusion deformation of the flexible sealing member 5, the hot work can be carried out, and there is no need to replace the inert gas of the system pipeline until the level that will not cause harm to personnel after long-term inhalation is met, which greatly shortens the inert gas replacement time of the system, reduces energy waste, and saves manpower and material resources.

[0034] like Figure 1 and Figure 2 As shown, in this embodiment, the fixed plate 1 and the movable plate 2 are cylindrical plates, the transmission rod 3 is a slender cylinder, which penetrates the fixed plate 1 and the movable plate 2, and the transmission rod 3 is rotatably connected to the fixed plate 1 by means of a bearing. The locking nut 4 is welded to the surface of the movable plate 2 on one side facing away from the fixed plate 1, and the transmission rod 3 is provided with an external thread in the circumferential direction. The locking nut 4 is sleeved with the transmission rod 3 and is threadedly connected to the transmission rod 3. The flexible seal 5 is wrapped around the transmission rod 3 between the movable plate 2 and the fixed plate 1, and deforms and expands in the circumferential direction with the extrusion of the movable plate 2 until it is tightly abutted against the circumferential inner wall of the pipeline. According to the actual application, the specific dimensions of the fixed plate 1 and the movable plate 2 can be adjusted to adapt to the inner diameter of the pipeline of different sizes, and the specific dimensions of the transmission rod 3 can also be adjusted to extend into different defective positions of the pipeline. The flexible seal 5 can be selected from any material that can be deformed under extrusion conditions to achieve a sealing effect. The gas sensor and the alarm can be selected from any commercially available specifications and models, as long as they can accurately monitor the gas concentration of flammable, toxic and harmful gases and can issue a sound alarm. The controller controls the control logic of the alarm to sound an alarm according to the received gas concentration data. This can be achieved according to the existing mature algorithms, and its specific working principle will not be described in detail here.

[0035] Optionally, the pipeline isolation device further includes an annular airbag (not shown), which is sleeved with a locking nut 4. The annular airbag is similar to a life buoy in structure. In this arrangement, during the hot work operation, if the concentration of flammable, toxic and harmful gases exceeds the standard again, the annular airbag is inflated to completely block the pipeline in which it is located, so that the gas in the pipeline cannot continue to flow downstream, and the hot work operation can continue.

[0036] During the hot work process, the gas sensor monitors the concentration of flammable, toxic and harmful gases in the pipeline in real time, and transmits the gas concentration data to the controller. When the gas concentration data received by the controller is greater than the gas concentration threshold, it indicates that there may be a problem with the sealing of the pipeline by the flexible seal 5, and the controller controls the alarm to sound an alarm. At this time, the hot work is stopped, but there is no need to pull one end of the fixed plate 1 out of the pipeline for maintenance. Inflate the annular airbag directly. After the annular airbag is inflated, it expands toward the circumferential inner wall of the pipeline and the locking nut 4 until the pipeline is completely blocked. At this time, the pipeline is blocked again, and the gas concentration data is less than or equal to the gas concentration threshold again. The controller controls the alarm to stop sounding the alarm, and stops inflating the annular airbag, and the hot work can continue.

[0037] Optionally, the pipeline isolation device further includes an air storage tank (not shown), which is connected to the annular airbag via an air charging line, and a valve is installed on the air charging line. By adding an air storage tank, the annular airbag can be inflated at any time when needed without having to temporarily find an air source.

[0038] When it is necessary to inflate the annular airbag, open the valve, and gas with a certain pressure will be discharged from the gas tank and filled into the annular airbag through the inflation pipeline. When the annular airbag completely blocks the circumferential inner wall of the pipeline, close the valve and stop inflating the annular airbag.

[0039] Optionally, the pipeline isolation device further comprises an air pump (not shown), which is installed on the air charging pipeline. The air pump is provided to realize rapid inflation of the annular airbag.

[0040] When it is necessary to inflate the annular airbag, open the valve, start the air pump, and make the air pump move forward, so that the gas in the air tank is quickly injected into the annular airbag through the air filling pipeline. When the annular airbag does not need to be inflated any more, turn off the air pump and close the valve. When the hot work is completed and the device needs to be removed from the pipeline, open the valve, start the air pump, and make the air pump move in the reverse direction, so that the gas in the annular airbag is transported back to the air tank.

[0041] Optionally, a handle 6 is fixed to one end of the transmission rod 3 away from the fixing plate 1. The handle 6 is provided to facilitate the operator to hold it, so as to smoothly rotate the transmission rod 3.

[0042] According to the actual application, the handle 6 can be set to any structural form, as long as it is easy to hold. The handle 6 can also be set to a hexagonal shape so as to be used in conjunction with a hexagonal wrench.

[0043] Optionally, the pipeline isolation device further includes a driving assembly (not shown), which is drivingly connected to one end of the transmission rod 3 away from the fixing plate 1 to drive the transmission rod 3 to reciprocate. The driving assembly is used to drive the transmission rod 3 to rotate, eliminating the need for operators to manually rotate the transmission rod 3, which is conducive to improving work efficiency.

[0044] According to the actual application, the driving assembly can be composed of any structure, as long as it can drive the transmission rod 3 to rotate back and forth. For example, the driving assembly can include a motor, a fixed first gear is sleeved on the output shaft of the motor, a second gear is sleeved on the end of the transmission rod 3 away from the fixed plate 1, and the second gear is meshed with the first gear. When the motor is started, the output shaft of the motor rotates in the first direction, which drives the first gear connected to it to rotate in the same direction, and then drives the second gear meshed with the first gear to rotate, and finally drives the transmission rod 3 connected to the second gear to rotate forward. When the transmission rod 3 needs to rotate in the opposite direction, it only needs to start the motor to rotate the output shaft of the motor in the second direction. The second direction is opposite to the first direction.

[0045] Optionally, a groove (not shown) is provided on the side wall of the transmission rod 3, and the alarm is arranged in the groove. This arrangement prevents the alarm from being exposed to the outer wall of the transmission rod 3 and being damaged by collision.

[0046] According to actual application conditions, the gas sensor and the controller may also be arranged in the groove of the outer wall of the transmission rod 3 .

[0047] Optionally, the movable plate 2, the fixed plate 1 and the transmission rod 3 are coaxially arranged. If the three are coaxially arranged, when the transmission rod 3 is rotated, the three actions are unified, which is convenient for operation.

[0048] like Figure 1 and Figure 2 As shown, the transmission rod 3 passes through the axis of the movable plate 2 and the fixed plate 1.

[0049] Optionally, a length scale value is provided on the transmission rod 3. In this arrangement, one end of the fixing plate 1 of the device can be accurately sent into the depth corresponding to the defect position in the pipeline with reference to the length scale value.

[0050] Optionally, the flexible sealing member 5 is a graphite packing, which has good chemical stability, fatigue resistance, good resilience and self-lubricity, can adapt to high temperature, high pressure and corrosive environment, and has a wide range of applications.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A pipeline isolation device, characterized in that: include: Fixed plates and movable plates arranged at intervals; A transmission rod, the transmission rod passes through the movable plate and the fixed plate, the transmission rod is rotatably connected to the fixed plate, and is movably connected to the movable plate; A locking nut, the locking nut is fixedly connected to the movable plate and is threadedly connected to the transmission rod; a flexible seal, the flexible seal being wound around the transmission rod between the movable plate and the fixed plate; A gas sensor, wherein the gas sensor is mounted on the transmission rod at a side of the movable plate away from the fixed plate; An alarm, the alarm being mounted on the transmission rod on a side of the movable plate away from the fixed plate; A controller, wherein an input end of the controller is communicatively connected to an output end of the gas sensor, and an output end of the controller is communicatively connected to an input end of the alarm.

2. The pipeline isolation device according to claim 1, characterized in that: Also includes: An annular airbag is sleeved with the locking nut.

3. The pipeline isolation device according to claim 2, characterized in that: Also includes: An air storage tank is connected to the annular airbag through an air charging pipeline, and a valve is installed on the air charging pipeline.

4. The pipeline isolation device according to claim 3, characterized in that: Also includes: An air pump is installed on the air charging line.

5. The pipeline isolation device according to any one of claims 1 to 4, characterized in that: A handle is fixed on one end of the transmission rod away from the fixing plate.

6. The pipeline isolation device according to any one of claims 1 to 4, characterized in that: Also includes: A driving assembly is drivingly connected to an end of the transmission rod away from the fixing plate to drive the transmission rod to reciprocate.

7. The pipeline isolation device according to any one of claims 1 to 4, characterized in that: A groove is provided on the side wall of the transmission rod, and the alarm is arranged in the groove.

8. The pipeline isolation device according to any one of claims 1 to 4, characterized in that: The movable plate, the fixed plate and the transmission rod are coaxially arranged.

9. The pipeline isolation device according to any one of claims 1 to 4, characterized in that: The transmission rod is provided with length scale values.

10. The pipeline isolation device according to any one of claims 1 to 4, characterized in that: The flexible sealing element is a graphite packing.

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