Safe pressure measuring instrument for oil pipeline

Abstract

The utility model discloses a safety pressure measuring instrument for an oil pipeline, which relates to the technical field of oil pipeline pressure monitoring and comprises a pressure transmitter composed of a pressure transmitter main body, a connecting column, a polygonal block, an external thread connecting part and a butt joint cylinder, a mounting part and a sealing element, and the mounting part comprises a fixed cylinder, an internal thread hole groove, a through hole and a first half C-shaped ring groove. And the sealing element is used for realizing the sealing operation of the external thread connecting part, the butt joint cylinder and the fixed cylinder. Good installation and sealing of the pressure transmitter can be achieved by arranging the sealing element, when the pressure transmitter is disassembled, the sealing element can be smoothly taken out of the fixed cylinder so that the sealing element can be conveniently replaced, meanwhile, compared with a traditional integrated annular sealing ring, the combined type structure of the sealing element is more convenient to disassemble and assemble, and the sealing effect is better. And external tools are not needed, the butt joint cylinder is not damaged, and the maintenance convenience of the pressure transmitter is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of oil pipeline pressure monitoring technology, specifically an oil pipeline safety pressure tapping device. Background Technology

[0002] Pipeline pressure is a key factor affecting the safe operation of pipelines. The regulation of normal temperature oil pipelines mainly involves pressure control. Pipeline pressure is controlled by adjusting the start and stop of oil pumps, the speed of variable frequency pumps, and the opening of regulating valves. By keeping the operating pressure at control points and key points within a safe range, the continuity and integrity of pipeline operation can be ensured. However, in the process of controlling the pressure of oil pipelines, it is necessary to monitor the pressure of the oil pipeline in real time.

[0003] Pressure transmitters are commonly used devices for pressure monitoring in oil pipelines. They are devices that convert pressure into pneumatic or electrical signals for control and remote transmission. They transform the physical pressure parameters of gases, liquids, etc., sensed by the pressure sensor into standard electrical signals (such as 4-20mA DC), which are then supplied to secondary instruments such as indicators, recorders, and controllers for measurement, indication, and process regulation. Their basic principle is as follows:

[0004] The electrical component in a pressure transmitter that senses pressure is typically a resistance strain gauge. A resistance strain gauge is a sensitive device that converts the pressure on the measured object into an electrical signal. The most commonly used types of resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. Metal resistance strain gauges come in two types: wire strain gauges and metal foil strain gauges. They are usually tightly bonded to a substrate that generates mechanical strain using a special adhesive. When the substrate is subjected to stress, the resistance strain gauge deforms, causing a change in its resistance, which in turn changes the voltage applied across the resistor.

[0005] Under current technology, when installing a pressure transmitter, a corresponding threaded connecting sleeve is welded to the pipeline, and a connecting rod is connected to the outer wall of the pressure transmitter. The outer wall of the connecting rod is provided with threads that match the threaded connecting sleeve. When connecting the connecting rod to the threaded connecting sleeve, in order to ensure the sealing of the connection, it is usually necessary to wrap multiple turns of tape around the connecting rod before installing the connecting rod into the threaded connecting sleeve. However, this connection method is prone to poor sealing due to incorrect tape wrapping, which not only affects pressure detection but also affects the safety of oil pipeline transportation. Based on this, in order to further improve the sealing performance of the connection between the pressure transmitter and the oil pipeline, a safety pressure tapping device for oil pipelines is provided. Utility Model Content

[0006] The purpose of this invention is to provide a safety pressure tapping device for oil pipelines in order to solve the problems mentioned above.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a safety pressure tapping device for oil pipelines, comprising a pressure transmitter and an installation part consisting of a pressure transmitter body, a connecting column, a polygonal block, an external threaded connection part, and a docking cylinder. The connecting column, polygonal block, external threaded connection part, and docking cylinder are arranged and fixed vertically in sequence, and the connecting column is fixed to the bottom of the pressure transmitter body. The connecting column, polygonal block, external threaded connection part, and docking cylinder have a hollow structure. The installation part includes a fixed cylinder, an internal threaded groove, a through hole, and a first half-C-shaped annular groove.

[0008] The internal threaded groove and the through hole are distributed and opened inside the fixed cylinder from top to bottom and completely penetrate the upper and lower ends of the fixed cylinder. The first half C-shaped annular groove is formed at the junction of the internal threaded groove and the through hole.

[0009] The external threaded connection part is threadedly connected to the internal threaded groove, the docking cylinder is inserted into the inside of the through hole, and a sealing element is provided below the external threaded connection part located inside the internal threaded groove. The sealing element is used to achieve the sealing operation of the external threaded connection part, the docking cylinder and the fixed cylinder.

[0010] The sealing element includes a sealing ring, a second half-C-shaped annular groove, and an annular pressure groove;

[0011] The sealing ring is sleeved on the outside of the docking cylinder, the second half of the C-shaped annular groove is formed on the lower surface of the sealing ring, and a limiting ring is formed on the outside of the docking cylinder. The limiting ring is engaged with the inner side of the annular groove formed by the second half of the C-shaped annular groove and the first half of the C-shaped annular groove.

[0012] The annular groove is formed on the top of the sealing ring, and the lower end face of the external threaded connection is formed with an annular protrusion, which is engaged with the annular groove.

[0013] As a further embodiment of this utility model: the sealing ring is composed of two mating parts, each mating part being composed of small arc-shaped blocks and large arc-shaped blocks distributed vertically, and the vertical directions of the small arc-shaped blocks and large arc-shaped blocks of the two mating parts are opposite, with the small arc-shaped blocks on one mating part and the large arc-shaped blocks on the other mating part combining to form a ring structure.

[0014] As a further improvement of this utility model: the end faces of the two mating parts that fit together are respectively formed with mating grooves and mating protrusions, and several mating grooves and mating protrusions are provided along the horizontal and vertical sides of the splicing end faces.

[0015] As a further improvement of this utility model: multiple annular protrusions are provided with increasing diameters, the multiple annular protrusions are concentrically distributed, and the number and position of the annular pressure grooves correspond one-to-one with the number and position of the annular protrusions.

[0016] As a further embodiment of this utility model: the outer diameter of the sealing ring matches the inner diameter of the internal threaded groove, the inner diameter of the sealing ring matches the inner diameter of the mating cylinder, and the height of the sealing ring is slightly higher than the distance between the lower surface of the external threaded connection and the bottom of the inner wall of the internal threaded groove.

[0017] The outer diameter of the docking cylinder matches the inner diameter of the through hole.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] By setting a sealing element, a good installation seal for the pressure transmitter can be achieved. When disassembling the pressure transmitter, the sealing element can be easily taken out of the fixed cylinder for easy replacement. At the same time, the combined structure of the sealing element makes disassembly and assembly more convenient than the traditional one-piece annular seal ring. No external tools are required, and no damage is caused to the docking cylinder, effectively improving the ease of maintenance of the pressure transmitter. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a sectional view of the mounting part of this utility model;

[0022] Figure 3 This is a cross-sectional view of the installation part and the pressure transmitter of this utility model.

[0023] Figure 4 This is a schematic diagram showing the disassembly of the sealing ring and pressure transmitter of this utility model;

[0024] Figure 5 This is a schematic diagram of the sealing element of this utility model;

[0025] Figure 6 This is a disassembled schematic diagram of the sealing element of this utility model.

[0026] In the diagram: 1. Pressure transmitter; 101. Pressure transmitter body; 102. Connecting column; 103. Polygonal block; 104. External threaded connection; 105. Docking cylinder; 106. Limiting ring; 107. Annular protrusion; 2. Mounting part; 201. Fixed cylinder; 202. Internal threaded groove; 203. Through hole; 204. First half C-shaped annular groove; 3. Seal; 301. Sealing ring; 302. Second half C-shaped annular groove; 303. Annular pressure groove; 3011. Small arc block; 3012. Large arc block; 3013. Docking groove; 3014. Docking protrusion. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-6 In this embodiment of the present invention, a safety pressure tapping device for an oil pipeline includes a pressure transmitter 1 and a mounting part 2, which are composed of a pressure transmitter body 101, a connecting column 102, a polygonal block 103, an external threaded connection part 104, and a docking cylinder 105. The connecting column 102, the polygonal block 103, the external threaded connection part 104, and the docking cylinder 105 are arranged and fixed vertically in sequence, and the connecting column 102 is fixed to the bottom of the pressure transmitter body 101. The connecting column 102, the polygonal block 103, the external threaded connection part 104, and the docking cylinder 105 have a hollow structure. The mounting part 2 includes a fixed cylinder 201, an internal threaded groove 202, a through hole 203, and a first half C-shaped annular groove 204.

[0029] The internal threaded groove 202 and the through hole 203 are sequentially distributed from top to bottom inside the fixed cylinder 201 and completely penetrate the upper and lower ends of the fixed cylinder 201. The first half C-shaped annular groove 204 is formed at the junction of the internal threaded groove 202 and the through hole 203.

[0030] The external threaded connection part 104 is threadedly connected to the internal threaded groove 202, the mating cylinder 105 is inserted into the inside of the through hole 203, and a sealing element 3 is provided below the external threaded connection part 104 and inside the internal threaded groove 202. The sealing element 3 is used to achieve the sealing operation of the external threaded connection part 104, the mating cylinder 105 and the fixed cylinder 201.

[0031] The sealing element 3 includes a sealing ring 301, a second half C-shaped annular groove 302, and an annular pressure groove 303;

[0032] The sealing ring 301 is sleeved on the outside of the docking cylinder 105. The second half of the C-shaped annular groove 302 is formed on the lower surface of the sealing ring 301. The outer side of the docking cylinder 105 is formed with a limiting ring 106. The limiting ring 106 is snapped into the inner side of the annular groove formed by the second half of the C-shaped annular groove 302 and the first half of the C-shaped annular groove 204.

[0033] An annular groove 303 is formed on the top of the sealing ring 301, and an annular protrusion 107 is formed on the lower end face of the external threaded connection 104. The annular protrusion 107 and the annular groove 303 are engaged with each other.

[0034] Multiple annular protrusions 107 are provided with increasing diameters. The multiple annular protrusions 107 are concentrically distributed. The number and position of the annular pressure grooves 303 correspond one-to-one with the number and position of the annular protrusions 107. The depth of the annular pressure grooves 303 is slightly less than the height of the annular protrusions 107.

[0035] The outer diameter of the sealing ring 301 matches the inner diameter of the internal threaded groove 202, the inner diameter of the sealing ring 301 matches the inner diameter of the mating cylinder 105, and the height of the sealing ring 301 is slightly higher than the distance between the lower surface of the external threaded connection part 104 and the bottom of the inner wall of the internal threaded groove 202.

[0036] The outer diameter of the connecting cylinder 105 matches the inner diameter of the through hole 203.

[0037] In this embodiment, it should be noted that the fixed cylinder 201 is pre-welded and fixed to the detection branch of the oil pipeline. When installing the pressure transmitter 1, the sealing ring 301 can be first fitted onto the outside of the docking cylinder 105.

[0038] Then, insert the docking cylinder 105 into the fixed cylinder 201, and the sealing ring 301 simultaneously enters the fixed cylinder 201. After that, when the external threaded connection part 104 contacts the fixed cylinder 201, the polygonal block 103 can be turned by an external tool to make the external threaded connection part 104 threadedly connected to the internal threaded groove 202 and tightened.

[0039] Finally, the docking cylinder 105 is inserted into the through hole 203, and at this time the sealing ring 301 is pressed tightly. The outer side of the sealing ring 301 is tightly fitted with the inner wall of the internal threaded groove 202, and the inner wall of the sealing ring 301 is tightly fitted with the outer wall of the docking cylinder 105. The upper surface of the sealing ring 301 is formed into a corrugated sealing structure by the mutual compression of the annular groove 303 and the annular protrusion 107. At the same time, the lower surface of the sealing ring 301 is pressed with the limiting ring 106 by the second half C-shaped annular groove 302. In this way, a good sealing state can be maintained between the external threaded connection part 104 and the fixed cylinder 201 (it should be noted that the main function of the second half C-shaped annular groove 204 is to provide a storage space for the limiting ring 106).

[0040] When disassembling and repairing the pressure transmitter 1, the polygonal block 103 can be rotated in the opposite direction. During this process, when the docking cylinder 105 moves upward, the sealing ring 301 can be brought out of the fixed cylinder 201 through the limiting ring 106. This makes it easy to replace the aging sealing ring 301, thereby ensuring a good seal during secondary installation.

[0041] Please refer to this carefully. Figures 2-6The sealing ring 301 is composed of two mating parts, which are composed of small arc-shaped blocks 3011 and large arc-shaped blocks 3012 distributed vertically. The small arc-shaped blocks 3011 and large arc-shaped blocks 3012 of the two mating parts are in opposite vertical directions. The small arc-shaped blocks 3011 on one mating part and the large arc-shaped blocks 3012 on the other mating part are combined to form a ring structure.

[0042] The two mating parts have mating grooves 3013 and mating protrusions 3014 respectively formed on their mating end faces, and there are several mating grooves 3013 and mating protrusions 3014 along the horizontal and vertical sides of the splicing end faces.

[0043] In this embodiment, the sealing ring 301 is formed by two mating parts. Compared with the traditional one-piece annular sealing ring, it is easier to disassemble and assemble, does not require external tools, and will not damage the mating cylinder 105.

[0044] In addition, the structure of the docking groove 3013 and the docking protrusion 3014 makes the splice of the two docking parts corrugated. After the pressure transmitter 1 is installed, the two docking parts are squeezed and deformed to fit together completely. The corrugated splice surface can prevent the medium in the oil pipeline from flowing upward through this point, ensuring good sealing performance.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An oil pipeline safety pressure tapping instrument, comprising a pressure transmitter (1) composed of a pressure transmitter body (101), a connecting column (102), a polygonal block (103), an external threaded connecting part (104), and a butt joint cylinder column (105), and a mounting part (2), wherein the connecting column (102), the polygonal block (103), the external threaded connecting part (104), and the butt joint cylinder column (105) are sequentially and fixedly arranged vertically, the connecting column (102) is fixed to the bottom of the pressure transmitter body (101), and the connecting column (102), the polygonal block (103), the external threaded connecting part (104), and the butt joint cylinder column (105) are hollow structures, characterized in that, The mounting part (2) comprises a fixed cylinder (201), an internal threaded hole groove (202), a through hole (203), and a first half C-shaped ring groove (204); The internal threaded hole groove (202) and the through hole (203) are sequentially arranged in the fixed cylinder (201) from top to bottom and completely penetrate the upper and lower ends of the fixed cylinder (201), and the first half C-shaped ring groove (204) is formed at the junction of the internal threaded hole groove (202) and the through hole (203); The external threaded connection part (104) is threadedly connected with the internal threaded hole groove (202), the butt cylinder (105) is inserted into the inside of the through hole (203), and a sealing element (3) is arranged on the inside of the internal threaded hole groove (202) below the external threaded connection part (104), and the sealing element (3) is used for sealing the external threaded connection part (104), the butt cylinder (105), and the fixed cylinder (201); The sealing element (3) comprises a sealing ring (301), a second half C-shaped ring groove (302), and an annular pressing groove (303); The sealing ring (301) is sleeved on the outside of the butt cylinder (105), the second half C-shaped ring groove (302) is formed on the lower surface of the sealing ring (301), the outside of the butt cylinder (105) is formed with a limiting ring (106), and the limiting ring (106) is clamped on the inside of the annular groove formed by the second half C-shaped ring groove (302) and the first half C-shaped ring groove (204); The annular pressing groove (303) is formed on the top of the sealing ring (301), the lower end surface of the external threaded connection part (104) is formed with an annular protrusion (107), and the annular protrusion (107) and the annular pressing groove (303) are clamped with each other.

2. The oil pipeline safety pressure tapping instrument according to claim 1, characterized in that, The sealing ring (301) is composed of two butt joint parts, each butt joint part is composed of a small arc block (3011) and a large arc block (3012) arranged in an up-down manner, the up-down directions of the small arc blocks (3011) and the large arc blocks (3012) of the two butt joint parts are in opposite states, and the small arc block (3011) on one butt joint part and the large arc block (3012) on the other butt joint part are combined to form a ring structure.

3. A safety pressure tapping device for oil pipelines according to claim 2, characterized in that The end surfaces of the two butt joint parts that abut against each other are respectively formed with a butt joint groove (3013) and a butt joint protrusion (3014), and a plurality of butt joint grooves (3013) and butt joint protrusions (3014) are arranged along the horizontal and vertical directions of the abutting end surfaces.

4. The oil pipeline safety pressure tapping instrument according to claim 1, characterized in that, The annular protrusions (107) are arranged in a plurality of concentric arrangements, and the diameters of the annular protrusions (107) increase in sequence, the number and position of the annular pressing grooves (303) correspond to the number and position of the annular protrusions (107) one by one.

5. The oil pipeline safety pressure tapping instrument according to claim 1, characterized in that, The outer diameter of the sealing ring (301) matches the inner diameter of the internal threaded hole groove (202), the inner diameter of the sealing ring (301) matches the inner diameter of the butt cylinder (105), and the height of the sealing ring (301) is slightly higher than the spacing between the lower surface of the external threaded connection part (104) and the inner wall bottom of the internal threaded hole groove (202). The outer diameter of the butt cylinder (105) matches the inner diameter of the through hole (203).

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