Soluble pipe cleaner capable of realizing heat accelerated dissolution

Abstract

The utility model provides a soluble pipe cleaner with heat accelerated dissolution, which relates to the technical field of pipeline cleaning and comprises a shell and an elastic sealing film, the shell comprises a soluble pressure-bearing layer and a wear-resistant rubber layer, a U-shaped cavity is arranged in the soluble pressure-bearing layer, a water bag is arranged in the U-shaped cavity, and water used for performing hydrolysis reaction with the soluble pressure-bearing layer is arranged in the water bag. A piston rod is arranged in the heat conduction cylinder, an ejector pin matched with the water bag is installed at the front end of the piston rod, the piston rod is connected with a spring, the spring is connected with the elastic sealing film, and a composite film is installed at the front end of the heat conduction cylinder. When the pipe cleaner is blocked, the ejector pin is pushed by the piston rod to pierce the water bag, so that the soluble pressure-bearing layer is quickly dissolved and broken, the pipe cleaner quickly passes through the blocked position, and the problem of complicated pipe cleaning operation caused by blockage of a traditional pipe cleaner in the operation process is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of pipeline cleaning technology, specifically a soluble pipeline cleaning pig that uses thermally accelerated dissolution. Background Technology

[0002] Long-distance natural gas pipelines are prone to accumulating impurities, liquids, and contaminants during operation, leading to reduced transport efficiency, increased frictional losses, internal corrosion, and shortened service life. Therefore, regular pipeline cleaning is essential to ensure operational efficiency, and pipeline pigs are the primary tools used for this purpose. However, existing pipeline pigs are prone to becoming stuck in pipelines when encountering deformations or other situations that make direct penetration difficult. Once stuck, reverse pressure must be applied, or pipeline transport must be stopped, and the pig must be cut to remove it, which significantly hinders the cleaning operation and the long-distance pipeline itself. Therefore, there is an urgent need to develop a pipeline pig that can meet the requirements for pipeline detection during normal cleaning operations and automatically unblock during operation. Utility Model Content

[0003] This invention provides a thermally accelerated dissolving soluble pigging tool that can quickly dissolve and break down into its components to be discharged from the pipeline when it encounters obstruction or blockage during the pigging probe operation.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A thermally accelerated dissolution soluble pig includes a housing and an elastic sealing membrane disposed at the rear end of the housing. The housing includes a soluble pressure-bearing layer and a wear-resistant rubber layer covering the outer layer of the soluble pressure-bearing layer. The wear-resistant rubber layer and the elastic sealing membrane enclose a sealed space, and there is a gap between the elastic sealing membrane and the rear end of the soluble pressure-bearing layer. A U-shaped chamber is provided inside the soluble pressure-bearing layer, and a water bladder is provided inside the U-shaped chamber. The water bladder contains water for hydrolysis reaction with the soluble pressure-bearing layer.

[0006] A heat-conducting cylinder is arranged axially inside the U-shaped cavity. The heat-conducting cylinder has a central chamber and a piston rod that reciprocates along the central chamber. A pin that cooperates with the water bladder is installed at the front end of the piston rod. A spring is connected to the rear end of the piston rod. The other end of the spring is connected to the front side wall of the elastic sealing membrane. A composite membrane is installed at the contact point between the front end of the heat-conducting cylinder and the water bladder.

[0007] Furthermore, a piston head one is installed at the front end of the piston rod, and a piston head two is installed at the rear end of the piston rod. The piston head one, piston head two, and the central chamber enclose a water storage chamber, which stores water. The ejector pin is located in front of the piston head one.

[0008] Furthermore, the heat-conducting cylinder also includes an outer heating pipe, an inner heating pipe, and an annular cavity formed by the outer heating pipe and the inner heating pipe, wherein quicklime is provided in the annular cavity; a water inlet is installed at the front end of the inner heating pipe, and non-woven fabric is installed on the water inlet, and the water inlet is located on the front side of the piston head.

[0009] Furthermore, the rear sidewall of the elastic sealing membrane is connected to a telescopic device, which includes a central fixing block and several telescopic arms mounted on the central fixing block. The telescopic arms are evenly distributed radially along the elastic sealing membrane, and the telescopic ends of the telescopic arms are respectively fixedly connected to the elastic sealing membrane. The end of the telescopic arm is provided with an arc-shaped plate for contacting the inner wall of the natural gas pipeline, and arc-shaped wing plates are respectively connected to both sides of the arc-shaped plate.

[0010] Furthermore, the inner wall of the soluble pressure-bearing layer has a rough and uneven surface.

[0011] Furthermore, the casing is bullet-shaped.

[0012] This utility model has the following beneficial effects:

[0013] 1. In this utility model, when the pipeline pig encounters obstruction, the piston rod pushes the pin to puncture the water bladder. The water in the water bladder undergoes a hydrolytic reaction with the soluble pressure-bearing layer, causing the soluble pressure-bearing layer to dissolve and break down rapidly, losing its rigid support performance. This leads to the collapse of the wear-resistant rubber layer, allowing the pipeline pig to quickly pass through the obstruction. During normal operation, it can perform pipeline exploration and cleaning operations; when encountering obstruction, it can quickly unblock and discharge the pipeline, effectively solving the complicated pipeline cleaning operations caused by blockages in traditional pipeline pigs.

[0014] 2. When the pig encounters obstruction, the piston rod pushes the pin forward to puncture the water bladder. During this process, the piston head moves forward, so that the water inlet is located between the piston head and the piston head. The water in the water storage chamber enters the annular chamber through the water inlet and reacts with quicklime to release heat, which accelerates the dissolution of the soluble pressure-bearing layer, effectively reducing the time of the pig getting stuck and achieving rapid unblocking.

[0015] 3. The telescopic device in this utility model contacts the natural gas pipeline through multiple telescopic arms. When it encounters an obstruction, the telescopic arms are compressed under pressure, and simultaneously cause the elastic sealing membrane to contract, ensuring the airtightness of the telescopic device. The arc-shaped wing plate can work with the telescopic arms to effectively pass through the obstruction point, making it highly practical.

[0016] 4. In this utility model, the inner wall of the soluble pressure-bearing layer is provided with a rough and uneven surface, which can effectively increase the contact area between water and the soluble pressure-bearing layer and accelerate the hydrolysis reaction. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of the internal structure of this utility model embodiment under normal conditions;

[0019] Figure 3 This is a cross-sectional view of the internal structure of this utility model under obstructed conditions according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the heat-conducting cylinder structure in an embodiment of this utility model;

[0021] Figure 5 This is a cross-sectional view of the heat-conducting cylinder structure in an embodiment of this utility model;

[0022] Figure 6 This is a schematic diagram of the telescopic device in an embodiment of this utility model;

[0023] Figure 7 This is a schematic diagram of the internal structure of the telescopic device in an embodiment of this utility model;

[0024] Figure 8 This is an enlarged view of the inner surface of the soluble pressure-bearing layer in an embodiment of this utility model;

[0025] Among them, 1. wear-resistant rubber layer; 2. soluble pressure-bearing layer; 3. water bladder; 4. composite membrane; 5. water inlet; 6. ejector pin; 7. piston rod; 8. heat-conducting cylinder; 9. spring; 10. elastic sealing membrane; 11. telescopic device; 12. telescopic arm; 13. arc plate; 14. arc wing plate. Detailed Implementation

[0026] The present invention will now be described in detail with reference to specific embodiments.

[0027] like Figures 1 to 3 As shown, this embodiment is a thermally accelerated dissolution soluble pigging device, including a housing and an elastic sealing membrane 10 disposed at the rear end of the housing. The rear side wall of the elastic sealing membrane 10 is connected to a telescopic device 11.

[0028] The shell includes a soluble pressure-bearing layer 2 and a wear-resistant rubber layer 1 covering the outer layer of the soluble pressure-bearing layer 2. The wear-resistant rubber layer 1 and the inner sidewall of the elastic sealing membrane 10 enclose a sealed space, and there is a gap between the front sidewall of the elastic sealing membrane 10 and the rear end of the soluble pressure-bearing layer 2. A U-shaped chamber is provided inside the soluble pressure-bearing layer 2, and a water bladder 3 is provided inside the U-shaped chamber. Specifically, the opening end of the U-shaped chamber faces the front sidewall of the elastic sealing membrane 10.

[0029] Furthermore, such as Figure 4 and Figure 5As shown, a heat-conducting cylinder 8 is axially arranged within the U-shaped cavity. The heat-conducting cylinder 8 includes an outer heating tube and an inner heating tube. The inner heating tube is hollow, forming a central chamber. A piston rod 7 is coaxially arranged within the central chamber, and the piston rod 7 can reciprocate along the inner heating tube. A pin 6 that cooperates with the water bladder 3 is installed at the front end of the piston rod 7, and a spring 9 is connected to the rear end of the piston rod 7. The other end of the spring 9 is connected to the front side wall of the elastic sealing membrane 10. A composite membrane 4 is installed at the contact point between the front end of the heat-conducting cylinder 8 and the water bladder 3.

[0030] Specifically, according to the experiment, in this embodiment, the puncture pressure of the needle 6 piercing the composite membrane 4 needs to be no less than 1.0 MPa.

[0031] Furthermore, a piston head 1 is installed at the front end of the piston rod 7, and a piston head 2 is installed at the rear end of the piston rod 7. The piston head 1, piston head 2 and the inner wall of the inner heating tube form a water storage cavity, which stores water.

[0032] The heat-conducting cylinder 8 also includes an annular chamber formed by an outer heating pipe and an inner heating pipe, and quicklime is placed in the annular chamber. A water inlet 5 is installed at the front end of the inner heating pipe, and non-woven fabric is installed at the water inlet 5, which is located in front of the piston head. Specifically, in this embodiment, the non-woven fabric installed at the water inlet 5 is used to prevent quicklime in the annular chamber from entering the central chamber. In the normal state of the pig, the piston head is located behind the water inlet 5, and the water in the storage chamber is separated from the quicklime in the annular chamber. When the pig encounters a blockage, the piston rod 7 pushes the piston head forward until the ejector pin 6 punctures the composite membrane 4, and the piston head is located in front of the water inlet 5. In this state, the water in the storage chamber enters the annular chamber through the non-woven fabric and the water inlet 5, and the quicklime releases heat upon contact with the water.

[0033] Furthermore, such as Figure 6 and Figure 7 As shown, the telescopic device 11 includes a central fixing block and several telescopic arms 12 mounted on the central fixing block. The central fixing block cooperates with the rear end of the spring 9. The telescopic arms 12 are evenly distributed radially along the elastic sealing membrane 10, and the telescopic ends of the telescopic arms 12 are all fixedly connected to the elastic sealing membrane 10, so that the elastic sealing membrane 10 and the telescopic device 11 can extend and retract synchronously. The end of the telescopic arm 12 is provided with an arc-shaped plate 13 for contacting the inner wall of the natural gas pipeline, and arc-shaped wing plates 14 are respectively connected to both sides of the arc-shaped plate 13.

[0034] Specifically, in this embodiment, under normal conditions, the telescopic arm 12 of the pig is in an extended state, and the elastic sealing membrane 10 has a certain tension. When the pig encounters a blockage, the telescopic arm 12 is compressed and retracts, which in turn causes the elastic sealing membrane 10 to contract synchronously, ensuring the airtightness of the telescopic device 11 during the telescopic process, so that the telescopic device 11 can pass through the blockage smoothly.

[0035] Furthermore, such as Figure 8 As shown, the inner wall of the soluble pressure-bearing layer 2 has a rough and uneven surface, which can effectively increase the contact area between water and the soluble pressure-bearing layer 2 and accelerate the hydrolysis reaction.

[0036] Specifically, in this embodiment, the wear-resistant rubber layer 1 is bullet-shaped and wraps around the soluble pressure-bearing layer 2. The soluble pressure-bearing layer 2 is mainly prepared by heating polyvinyl alcohol, esterified starch and glycerin. The soluble pressure-bearing layer 2 begins to dissolve when it comes into contact with water.

[0037] Specifically, the water bladder 3 is U-shaped and fits into the U-shaped chamber.

[0038] Specifically, the method of using a rapidly dissolving soluble pig in this embodiment includes the following steps:

[0039] (a) During operation, a special pig launching and receiving device is used to put the pig into the natural gas pipeline that needs to be cleaned. The size of the pig is slightly larger than the pipeline. The pig is sealed with the pipeline by the interference fit of the pig size. The gas pressure inside the pipeline is used as a power source to drive the pig to run inside the pipeline.

[0040] (ii) Since the pig has a certain interference fit, it forms a closed chamber with the natural gas pipeline. At this time, the telescopic arm 12 is in contact with the natural gas pipeline and is in an extended state. Under the action of gas pressure, the back pressure of the gas in the natural gas pipeline is used as the power for the pig to move, thereby carrying out the pigging operation.

[0041] (III) If the pig encounters obstruction during operation, it can use air pressure or other media as a power source. When the outermost wear-resistant rubber layer 1 is blocked, the telescopic device 11 pushes the spring 9 through the central fixed block and the elastic sealing membrane 10 under the action of air pressure, and then pushes the ejector pin 6 forward through the piston rod 7. When the pressure difference before and after the pig reaches 1.0 MPa, the ejector pin 6 first pushes open the composite membrane 4 at the front end of the heat-conducting cylinder 8, and then punctures the water bladder 3, releasing the water in the water bladder 3 to come into contact with the soluble pressure-bearing layer 2 and undergo a hydrolysis reaction, dissolving the soluble pressure-bearing layer 2. At the same time, piston head one moves to the front of water inlet 5, and piston head two is located behind water inlet 5. Water in the water storage chamber flows into the annular chamber through water inlet 5, reacts with quicklime and releases heat, heating the water in the U-shaped chamber. Temperature can affect the solubility of soluble pressure-bearing layer 2 to a certain extent. Therefore, quicklime releases heat when it comes into contact with water, which can accelerate the dissolution of soluble pressure-bearing layer 2, so that soluble pressure-bearing layer 2 can be quickly dissolved and broken, lose its rigid support performance, and cause the outer wear-resistant rubber layer 1 to collapse.

[0042] (iv) When the wear-resistant rubber layer 1 collapses, the telescopic device 11 installed at the tail of the pig is pushed forward by air pressure or other power source. The telescopic arm 12 and the elastic sealing membrane 10 retract inward synchronously to pass through the blockage and push the dissolved pig out of the pipeline.

[0043] (v) In the pig collection device, we can observe the status of the pig and realize the function of probing the pig.

Claims

1. A thermally accelerated dissolution soluble pig, characterized in that: The device includes a shell and an elastic sealing membrane (10) disposed at the rear end of the shell. The shell includes a soluble pressure-bearing layer (2) and a wear-resistant rubber layer (1) covering the outer layer of the soluble pressure-bearing layer (2). The wear-resistant rubber layer (1) and the elastic sealing membrane (10) enclose a sealed space, and there is a gap between the elastic sealing membrane (10) and the rear end of the soluble pressure-bearing layer (2). The soluble pressure-bearing layer (2) is provided with a U-shaped chamber, and a water bladder (3) is provided in the U-shaped chamber. The water bladder (3) is provided with water for hydrolysis reaction with the soluble pressure-bearing layer (2). A heat-conducting cylinder (8) is provided axially inside the U-shaped cavity. The heat-conducting cylinder (8) has a central cavity and a piston rod (7) that reciprocates along the central cavity. A pin (6) that cooperates with the water bag (3) is installed at the front end of the piston rod (7). A spring (9) is connected to the rear end of the piston rod (7). The other end of the spring (9) is connected to the front side wall of the elastic sealing membrane (10). A composite membrane (4) is installed at the contact point between the front end of the heat-conducting cylinder (8) and the water bag (3).

2. The thermally accelerated dissolution soluble pigging device as described in claim 1, characterized in that: The piston rod (7) is equipped with a piston head 1 at the front end and a piston head 2 at the rear end. The piston head 1, piston head 2 and the central chamber form a water storage chamber, which stores water. The ejector pin (6) is located in front of the piston head 1.

3. The thermally accelerated dissolution soluble pigging device as described in claim 2, characterized in that: The heat-conducting cylinder (8) also includes an outer heating pipe, an inner heating pipe, and an annular cavity formed by the outer heating pipe and the inner heating pipe. Quicklime is provided in the annular cavity. A water inlet (5) is installed at the front end of the inner heating pipe. Non-woven fabric is installed on the water inlet (5), and the water inlet (5) is located on the front side of the piston head.

4. A thermally accelerated dissolution soluble pigging device as described in any one of claims 1 to 3, characterized in that: The rear side wall of the elastic sealing membrane (10) is connected to a telescopic device (11). The telescopic device (11) includes a central fixing block and several telescopic arms (12) installed on the central fixing block. The telescopic arms (12) are evenly distributed radially along the elastic sealing membrane (10), and the telescopic ends of the telescopic arms (12) are fixedly connected to the elastic sealing membrane (10). The end of the telescopic arm (12) is provided with an arc-shaped plate (13) for contacting the inner wall of the natural gas pipeline. Arc-shaped wing plates (14) are connected to both sides of the arc-shaped plate (13).

5. The thermally accelerated dissolution soluble pigging device as described in claim 4, characterized in that: The inner wall of the soluble pressure-bearing layer (2) has a rough and uneven surface.

6. The thermally accelerated dissolution soluble pigging device as described in claim 4, characterized in that: The casing is bullet-shaped.

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