A water cut analyzer for oil detection

Abstract

The application relates to the technical field of petroleum quality detection equipment, and relates to a water content analyzer for petroleum detection, which comprises a fixing sleeve, the fixing sleeve is fixed at the top of a detection pipe, an upper sealing plate is fixed on the top of the fixing sleeve, a protective sieve plate is fixed on the upper sealing plate, an inner support is fixed on the inner wall of the upper sealing plate, a lower shell body is fixedly arranged on the inner support and penetrates through the inner support, a pressure slow-release mechanism is arranged on the lower shell body, a lower sealing plate is fixed at the bottom of the fixing sleeve, and a reflux port is arranged at the edge of the lower sealing plate; the double-sleeve sealing structure formed by the inner sleeve, the lower shell body and the external fixing sleeve is matched with each other, a top-opening valve core mechanism is matched, and on-off linkage control is realized; in the later maintenance, the oil conveying pipeline does not need to be shut down, the pipeline medium does not need to be depressurized and emptied, online dismounting and maintenance can be realized, the maintenance process is effectively simplified, the maintenance difficulty is reduced, and the convenience of equipment later maintenance is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of petroleum quality testing equipment, specifically relating to a water content analyzer for petroleum testing. Background Technology

[0002] Oil moisture content analyzers are widely used in online moisture content detection of oil pipelines. They can monitor the moisture content parameters of the oil medium inside the pipeline in real time, providing accurate data support for oil extraction, gathering and transportation, and refining process control. They are now widely used in oilfield development, oil and gas transportation, and oil processing. Most existing online oil moisture content analyzers adopt a fixed single-chamber installation structure, with the detection chamber directly connected to the oil pipeline. The inside of the equipment chamber is always in a conductive state with the pipeline medium. During later maintenance, disassembly, and repair, the existing equipment cannot automatically block the inflow of crude oil. The oil pipeline must be shut down in advance and the pipeline must be depressurized and emptied before disassembly and repair can be carried out. This not only interrupts normal oil production and affects the efficiency of continuous pipeline transportation, but also makes the pipeline start-up, shutdown, depressurization, and emptying operations cumbersome, greatly increasing the difficulty and workload of equipment maintenance. The equipment has poor adaptability to operating conditions and poor maintenance convenience, and cannot meet the online maintenance requirements of uninterrupted continuous oil pipeline transportation. Therefore, it is necessary to design an oil moisture content analyzer. Summary of the Invention

[0003] The purpose of this invention is to provide a water content analyzer for petroleum testing that is simple in structure and reasonably designed in order to solve the above-mentioned problems.

[0004] The present invention achieves the above objectives through the following technical solutions: A water content analyzer for petroleum testing includes a fixed sleeve fixed to the top of a detection tube. An upper sealing plate is fixed to the top of the fixed sleeve, and a sealing element is provided at the connection between the upper sealing plate and the fixed sleeve. A protective screen plate is fixed to the upper sealing plate, and an inner support is fixed to the inner wall of the upper sealing plate. A lower housing is fixed through the inner support, and a pressure relief mechanism is provided on the lower housing. A lower sealing plate is fixed to the bottom of the fixed sleeve, and a reflux port is opened at the edge of the lower sealing plate. A guide groove is opened on the side wall of the fixed sleeve. A top-opening valve core mechanism is provided on the lower sealing plate, and an anti-sand-entry mechanism is connected to the top-opening valve core mechanism. An inner sleeve is fixed to the top of the lower housing, and a sensing unit is installed on the top of the lower housing. The probe of the sensing unit is fixedly installed in a through groove on the side wall of the inner sleeve.

[0005] As a further optimization of the present invention, the pressure relief mechanism includes a closed shell fixed on the lower shell, a piston plate slidably connected in the closed shell, the piston plate slidably connected to the inner support, and a venting groove communicating with the closed shell is provided on the lower shell.

[0006] As a further optimization of the present invention, a guide rod is fixed to the top of the piston plate, and a support spring sleeved on the guide rod is provided between the piston plate and the lower housing.

[0007] As a further optimization of the present invention, the top-opening valve core mechanism includes a flow sleeve fixed on the lower sealing plate, a rotating frame rotatably connected to the flow sleeve, a support frame fixed on the rotating frame, and a central sleeve rotatably connected to the support frame.

[0008] As a further optimization of the present invention, a locking spring is fixed at the bottom of the central sleeve, the locking spring is fixed on the lower support plate, the lower support plate is slidably connected to the support frame, the bottom end of the inner support passes through the central sleeve and abuts against the lower support plate, and a sealing sleeve is fixed on the lower support plate.

[0009] As a further optimization of the present invention, the lower support plate is slidably connected to the bottom of the lower sealing plate, and a sealing frame for sealing the return port is fixed on the lower support plate, and the sealing frame is slidably connected to the fixed sleeve.

[0010] As a further optimization of the present invention, the anti-sand trapping mechanism includes a connecting ring rotatably connected to the lower support plate, and support rods are evenly arranged on the connecting ring. The support rods slide through the support frame, and a flexible scraper is fixed on the support rods and abuts against the side wall of the flow sleeve.

[0011] As a further optimization of the present invention, the top of the rotating frame is uniformly provided with anti-slip grooves, and side supports are abutted on the anti-slip grooves. The side supports are uniformly fixed to the bottom of the closed ring. The closed ring is rotatably connected between the upper sealing plate and the inner sleeve. A limit frame is fixed on the inner wall of the closed ring.

[0012] As a further optimization of the present invention, the top end of the guide rod is fixed with a lifting ring through the lower housing, a rotating ring is rotatably connected to the lifting ring, a side support rod is fixed to the rotating ring, the end of the side support rod is slidably connected in the guide groove, the guide groove is evenly opened on the inner wall of the limiting shell, the limiting shell is fixed on the inner sleeve, and the side support rod is slidably connected in the longitudinal sliding groove opened in the limiting frame.

[0013] As a further optimization of the present invention, the detection tube is connected to the oil delivery pipe via a flange, and an external support is provided at the top of the detection tube, with a fixing sleeve fixedly connected to the external support.

[0014] The beneficial effects of this invention are as follows: 1. This invention employs a double-sleeve sealing structure consisting of an inner sleeve and a lower shell, which cooperates with an outer fixed sleeve. Combined with a top-opening valve core mechanism, it achieves on / off linkage control. During normal assembly and tightening, the inner support presses down to open the lower support plate, releasing the sealing sleeve from the flow sleeve and the sealing frame from the return port, allowing the cavity to be open for normal sampling and testing. When the equipment needs maintenance and disassembly, simply loosen the fixing bolts of the upper sealing plate and lift the internal components upwards. The locking spring will then pull the lower support plate back to its original position, causing the sealing sleeve to re-seal the oil inlet of the flow sleeve. Simultaneously, the sealing frame seals the return port, completely blocking the entry of the medium inside the oil delivery pipe into the testing cavity. The entire process requires no shutdown of the oil pipeline or depressurization of the pipeline medium, enabling online disassembly and maintenance. This effectively simplifies the maintenance process, reduces maintenance difficulty, and improves the convenience of subsequent equipment maintenance.

[0015] 2. When the pipeline experiences a sudden high-pressure impact on the cavity, the pressure inside the outer jacket rises sharply. The high-pressure medium acts on the piston plate, pushing it upward and compressing the support spring. This piston displacement allows the cavity space to be cleared, releasing the instantaneous high pressure and buffering the direct impact of the high pressure on the cavity's sealing structure and sensing components. When the pipeline pressure drops, the support spring rebounds, causing the piston plate to reset, and the cavity pressure returns to a stable level. Through continuous adaptive reciprocating pressure stabilization, the impact caused by pipeline pressure fluctuations is effectively offset, avoiding problems such as seal failure, crude oil leakage, and component damage caused by high pressure. This significantly improves the equipment's resistance to pressure fluctuations and its long-term operational reliability.

[0016] 3. When the piston plate moves down to release pressure, the gas inside the sealed shell is squeezed and pushed into the inner sleeve, and discharged outward through the top protective screen plate. When the piston plate moves down to reset, ambient air from outside is fed back into the cavity through the protective screen plate. The intermittent circulation generated by the pressure fluctuation continuously blows the sensor unit installation area, promptly removing the heat accumulated inside the cavity. This avoids the problem of sensor detection parameters drifting and inaccuracy caused by long-term heat accumulation and temperature rise in the sealed cavity. No additional heat dissipation components are needed to ensure that the sensor unit operates in a suitable temperature environment for a long time, thus stabilizing the detection accuracy of the equipment.

[0017] 4. When the pressure relief mechanism of the present invention is working, the guide rod moves up and down with the piston plate, driving the lifting ring and rotating ring to move vertically. Under the trajectory limiting action of the guide groove and the limiting frame, a circumferential rotational force is generated, which sequentially drives the closing ring, rotating frame and support frame to rotate as a whole. Finally, the flexible scraper at the end of the support rod continuously scrapes circumferentially along the sealing and fitting position of the flow sleeve. It can remove oil sand and impurities attached to the sealing end face of the flow sleeve in real time, avoid sand particles getting stuck between the sealing surface of the sealing sleeve and the flow sleeve when the equipment is reset and sealed, eliminate the situation of sand particles squeezing and wearing, cracking the sealing sleeve, and prevent valve core jamming, poor sealing, crude oil leakage and other faults. It effectively extends the service life of the sealing structure and ensures flexible opening and closing of the equipment and long-term sealing reliability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the installation position of the fixing sleeve in this invention; Figure 3 This is a schematic diagram of the top-opening valve core mechanism in this invention; Figure 4 This is an assembly diagram of the top-opening valve core mechanism in this invention; Figure 5 yes Figure 4 A magnified view of a portion of region A in the middle; Figure 6 This is a schematic diagram of the anti-sand-entrapment mechanism in this invention; Figure 7 yes Figure 6 A magnified view of a portion of region B in the middle; Figure 8 This is an assembly diagram of the anti-sand-entrapment mechanism in this invention.

[0019] In the diagram: 1. Fixed sleeve; 2. Detection tube; 3. Upper sealing plate; 4. Inner support; 5. Lower housing; 6. Pressure relief mechanism; 7. Lower sealing plate; 8. Top-opening valve core mechanism; 9. Anti-sand trapping mechanism; 10. Guide channel; 11. Inner sleeve; 12. Sensing unit; 13. Return port; 14. Outer support; 15. Protective screen plate; 16. Oil delivery pipe; 60. Vent channel; 61. Sealing shell; 62. Piston plate; 63. Guide... 64. Rod; 85. Support spring; 86. Flow sleeve; 87. Rotating frame; 88. Support frame; 89. Center sleeve; 80. Locking spring; 81. Lower support plate; 82. Sealing sleeve; 83. Sealing frame; 84. Side support; 95. Guide groove; 96. Connecting ring; 97. Support rod; 98. Flexible scraper; 99. Closing ring; 90. Limiting frame; 91. Lifting ring; 90. Rotating ring; 91. Side support rod; 92. Limiting shell. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example: Please refer to Figures 1-8A water content analyzer for petroleum testing includes a fixing sleeve 1, which is fixed to the top of a detection tube 2. The detection tube 2 is connected to an oil delivery pipe 16 via a flange, allowing direct access to the petroleum medium inside the oil delivery pipe 16. This enables uninterrupted online sampling and testing, adapting to the continuous transportation conditions of oil pipelines without affecting normal oil transport operations, significantly improving testing convenience and operational adaptability. An external support 14 is provided at the top of the detection tube 2, and the fixing sleeve 1 is welded and fixed to the external support 14, effectively improving the overall structural strength and testing stability of the equipment. An upper sealing plate 3 is bolted to the top of the fixing sleeve 1, and the upper sealing plate 3... The connection between the upper sealing plate 3 and the fixed sleeve 1 is equipped with a sealing element. After the upper sealing plate 3 is fixed to the fixed sleeve 1, the top of the fixed sleeve 1 can be sealed, effectively preventing crude oil leakage from the cavity and blocking external dust, debris, and moisture from entering the cavity, ensuring a clean internal testing environment. A protective screen plate 15 is fixed on the upper sealing plate 3, and an inner support 4 is fixed on the inner wall of the upper sealing plate 3. A lower housing 5 is fixed through the inner support 4, and a pressure relief mechanism 6 is provided on the lower housing 5. An inner sleeve 11 is fixed on the top of the lower housing 5, and a sensing unit 12 is installed on the top of the lower housing 5. The sensing unit 12 consists of a capacitive sensor connected to the controller. Composed of a microwave sensor, temperature sensor, and pressure sensor, it can simultaneously perform multi-dimensional detection of petroleum composition and state. (Sensing unit 12 is existing technology and will not be described in detail here.) The probe of sensing unit 12 is fixedly installed in the through groove on the side wall of the inner sleeve 11. The probe surface is treated with a ceramic anti-corrosion coating process, which can effectively resist long-term corrosion and erosion wear of petroleum media, greatly improving the corrosion resistance and service life of the probe, and ensuring long-term stable detection of the equipment. A lower sealing plate 7 is fixed at the bottom of the fixed sleeve 1, and a return port 13 is opened at the edge of the lower sealing plate 7. A guide groove 10 is opened on the side wall of the fixed sleeve 1. The sealing plate 7 is equipped with a top-opening valve core mechanism 8. During installation, the entire upper sealing plate 3, inner support 4, inner sleeve 11 and lower housing 5 are pressed down from the top of the fixed sleeve 1, acting on the top-opening valve core mechanism 8 from above, so that the detection tube 2 is connected to the fixed sleeve 1. Under pressure, oil enters the annular space of the lower housing 5 and the fixed sleeve 1, and then works with the sensing unit 12 to detect and analyze the water content of the oil. At the same time, the return port 13 opened on the edge of the lower sealing plate 7 can cooperate with the guide groove 10 on the side wall of the fixed sleeve 1 to form a closed-loop medium circulation flow path, so as to realize the continuous circulation and renewal of the oil medium. The guide groove 10 can prevent sand particles from accumulating inside the cavity.During real-time monitoring, the pressure relief mechanism 6 is used to balance and alleviate the pressure of the medium inside the cavity. When the pressure of the oil delivery pipe 16 fluctuates or there is a sudden high-pressure impact on the inside of the cavity, the pressure relief mechanism 6 can buffer the high-pressure impact force, preventing the high pressure from directly acting on the sealing parts, thus improving the equipment's resistance to pressure fluctuations and long-term operational reliability. The top-opening valve core mechanism 8 is connected to an anti-sand-entry mechanism 9, which can clean the sealing parts of the top-opening valve core mechanism 8, effectively preventing sand particles from wearing down the sealing surface and causing the valve core to jam. This eliminates problems such as poor sealing, crude oil leakage, and valve core jamming caused by sand inclusions, effectively improving the service life of the sealing structure and ensuring the long-term sealing performance of the equipment.

[0022] The top-opening valve core mechanism 8 includes a flow sleeve 81 fixed on the lower sealing plate 7. The opening at the center of the flow sleeve 81 serves as a channel for oil inflow. A rotating frame 82 is rotatably connected to the flow sleeve 81. A support frame 83 is fixed on the rotating frame 82. A central sleeve 84 is rotatably connected to the support frame 83. A locking spring 85 is fixed at the bottom of the central sleeve 84. The bottom end of the locking spring 85 is fixed on the lower support plate 86. The lower support plate 86 is slidably connected to the support frame 83 via a support rod set at the top. The bottom end of the inner support 4 passes through the central sleeve 84 and abuts against the lower support plate 86. A sealing sleeve 87 made of high-pressure resistant fluororubber material is fixed on the lower support plate 86. The lower support plate 86 is slidably connected to the bottom of the lower sealing plate 7. A sealing frame 88 for sealing the return port 13 is fixed on the lower support plate 86. The sealing frame 88 is slidably connected to the outer wall of the fixed sleeve 1.

[0023] When the upper sealing plate 3, inner support 4, inner sleeve 11, and lower housing 5 are not installed, under the elastic force of the locking spring 85, the sealing sleeve 87 is inserted from the bottom and blocks the opening at the center of the flow sleeve 81. At the same time, the sealing bracket 88 abuts against the bottom of the lower sealing plate 7, synchronously blocking the return port 13. At this time, the top-opening valve core mechanism 8 is in a closed state, and the oil in the detection tube 2 will not enter the fixed sleeve 1. During installation, the upper sealing plate 3, inner support 4, inner sleeve 11, and lower housing 5 are inserted from above into the fixed sleeve 1. The upper sealing plate 3 is pressed down until the sealing element is fitted into the fixed sleeve 1. At this time, the inner sleeve 11 and the lower housing 5 form a complete inner sleeve, which, together with the outer fixed sleeve 1, forms a sealed double sleeve structure. As the upper sealing plate 3 continues to be pressed down, the bottom end of the inner support 4 passes through the central sleeve 84 and abuts against the lower support plate 86. Then, the locking spring 85 is stretched and drives the lower support plate 86 to move down, so that the sealing sleeve 87 is separated from the flow sleeve 81. At the same time, the sealing bracket 88 is separated from the lower support plate 86. At this time, the top-opening valve core mechanism... When valve 8 is in the open state, after the upper sealing plate 3 is fully pressed onto the fixed sleeve 1, it is locked with bolts. After the top-opening valve core mechanism 8 is opened, the oil in the detection tube 2 will pass through the flow sleeve 81 and enter the outer layer of the double sleeve structure. At this time, the oil will submerge the probe of the sensing unit 12. The sensing unit 12 can be used for detection. During the entire oil transportation process, as the pressure inside the pipeline fluctuates, the anti-sand trapping mechanism 9 can clean the sealing part of the top-opening valve core mechanism 8. During later maintenance, the upper sealing plate 3 is released from the fixed sleeve 1, the upper sealing plate 3 is lifted upward, the locking spring 85 pulls the lower support plate 86 to reset, the sealing sleeve 87 re-seals the flow sleeve 81, and the sealing frame 88 abuts against the bottom of the lower sealing plate 7 to simultaneously seal the return port 13. The top-opening valve core mechanism 8 is closed again. Under the action of the anti-sand trapping mechanism 9, it can effectively prevent sand particles in the oil from adhering to the inner wall of the flow sleeve 81 and getting stuck on the sealing sleeve 87 during sealing.

[0024] Please see Figure 6 and Figure 8The pressure relief mechanism 6 includes a closed shell 61 fixed to the lower shell 5. A piston plate 62 is slidably connected to the closed shell 61, and an inner support 4 slides through the piston plate 62. A venting groove 60 connected to the closed shell 61 is provided on the lower shell 5. The venting groove 60, together with the protective screen plate 15 at the top, allows the closed shell 61 to communicate with the external atmosphere. A guide rod 63 is fixed to the top of the piston plate 62. A support spring 64 is sleeved on the guide rod 63 between the piston plate 62 and the lower shell 5. In the non-pressurized state, the elastic force provided by the support spring 64 keeps the piston plate 62 below the closed shell 61. When the oil delivery pipe 16 experiences pressure fluctuations or instantaneous high-pressure impacts, the internal pressure of the outer jacket of the double-tube structure increases instantaneously. When the medium pressure is greater than the support elastic force of the support spring 64, the high-pressure medium pushes the piston plate 62 to slide upward along the inner seal of the closed shell 61, simultaneously compressing the support spring 64. 4. It stores elastic potential energy, and the piston plate 62 moves upward to make room for the extra space, effectively releasing the instantaneous high pressure inside the cavity, buffering the high pressure impact, and avoiding the high pressure directly acting on the sealing part. When the high pressure impact of the pipeline disappears and the pressure inside the outer jacket gradually drops back to the normal range, the support spring 64 releases the stored elastic potential energy and rebounds and extends, pushing the piston plate 62 to slide downward to reset and restore the initial stable pressure state. After that, it can continuously adapt to the pipeline pressure fluctuation and work in an adaptive manner, stabilizing the cavity pressure for a long time. During the pressure buffering process of the pressure relief mechanism 6, the upward movement of the piston plate 62 will push the gas in the sealed shell 61 into the inner sleeve 11, and then discharge it outward through the protective screen plate 15. At the same time, during the reset process, the external gas passes through the inner sleeve 11 to replenish the sealed shell 61. The intermittent airflow generated during the pressure buffering process can cool the space where the sensing unit 12 is located.

[0025] Please see Figure 6 and Figure 8 The anti-sand-clamping mechanism 9 includes a connecting ring 91 rotatably connected to the lower support plate 86. Support rods 92 are evenly distributed on the connecting ring 91, slidingly penetrating the support frame 83. A flexible scraper 93 is fixed to the support rod 92, abutting against the side wall of the flow sleeve 81. Anti-slip grooves are evenly distributed on the top of the rotating frame 82, with side supports 89 abutting against the anti-slip grooves. The side supports 89 are evenly fixed to the bottom of the closing ring 94. The closing ring 94 is rotatably and sealingly connected to the upper sealing plate 3 and the inner sleeve 11. In the middle, a limit frame 95 is fixed on the inner wall of the closed ring 94. The top end of the guide rod 63 passes through the lower housing 5 and is fixed with a lifting ring 96. A rotating ring 97 is rotatably connected to the lifting ring 96 through a bearing. A side support rod 98 is fixed on the rotating ring 97. The end of the side support rod 98 is slidably connected in the guide groove 90. The guide groove 90 is evenly opened on the inner wall of the limit shell 99. The limit shell 99 is fixed on the inner wall of the inner sleeve 11. The side support rod 98 is slidably connected in the longitudinal groove opened in the limit frame 95.

[0026] During installation, as the upper sealing plate 3 moves downward, the side bracket 89 abuts against the anti-slip groove on the top of the rotating frame 82, allowing the closing ring 94 to drive the rotating frame 82 to rotate synchronously. Simultaneously, as the lower support plate 86 moves downward, the sealing sleeve 87 disengages from the flow sleeve 81. At this time, the flexible scraper 93 is at the contact point between the flow sleeve 81 and the sealing sleeve 87 during sealing. When the pressure relief mechanism 6 is activated, it drives the guide rod 63 to reciprocate up and down. The top of the guide rod 63 synchronously drives the lifting ring 96 to rise and fall as a whole. During the rising and falling process, the lifting ring 96 drives the rotating frame 82 to rotate. The moving ring 97 moves vertically in sync. Simultaneously, under the limiting action of the guide groove 90 and the side support rod 98, the rotating ring 97 on the lifting ring 96 rotates. This, in turn, pulls the limiting frame 95 and the closing ring 94 to rotate via the side support rod 98. Subsequently, the friction between the side bracket 89 and the rotating frame 82 drives the support frame 83 to rotate synchronously. During the rotation of the support frame 83, the flexible scraper 93 on the support rod 92 can be used to reciprocate to scrape the contact area between the flow sleeve 81 and the sealing sleeve 87 during sealing, preventing sand particles from remaining.

[0027] It should be noted that, when the equipment of this petroleum testing water content analyzer is not fully assembled, the upper sealing plate 3, inner support 4, inner sleeve 11 and lower housing 5 are not pressed down and installed, and the top-opening valve core mechanism 8 is in a closed state. Under the elastic force of the locking spring 85, the high-pressure resistant fluororubber sealing sleeve 87 is inserted from the bottom to block the oil inlet channel in the center of the flow sleeve 81. At the same time, the sealing frame 88 on the lower support plate 86 simultaneously abuts against the bottom of the lower sealing plate 7, and simultaneously blocks the return port 13 at the edge of the lower sealing plate 7, completely blocking the communication channel between the detection tube 2 and the internal cavity of the fixed sleeve 1. At this time, the petroleum medium inside the petroleum delivery pipe 16 cannot enter the cavity of the fixed sleeve 1, and the equipment is in a closed standby state. During equipment installation, the upper sealing plate 3, inner support 4, inner sleeve 11, and lower housing 5 are pressed down from the top of the fixed sleeve 1 for assembly. A sealing element is fitted at the connection between the upper sealing plate 3 and the fixed sleeve 1. After pressing down, the top of the fixed sleeve 1 is sealed, which can effectively prevent crude oil from leaking out of the cavity and block external dust, debris, and moisture from entering the cavity, ensuring a clean and sealed internal testing environment. During the pressing process, the inner sleeve 11 and the lower housing 5 combine to form a complete inner sleeve structure, which, together with the outer fixed sleeve 1, constitutes a sealed double sleeve structure. As the components continue to press down, the bottom end of the inner support 4 passes through the central sleeve 84 and abuts against the lower support plate 86, overcoming the elastic force of the locking spring 85 and stretching the locking spring 85, causing the lower support plate 86 to slide down along the bottom of the lower sealing plate 7, so that the sealing sleeve 87 is separated from the central opening of the flow sleeve 81. At the same time, the sealing frame 88 moves down and separates from the lower sealing plate 7, releasing the blockage of the return port 13. The top-opening valve core mechanism 8 is fully opened. After the upper sealing plate 3 is fully pressed against the top of the fixed sleeve 1, it is locked and fixed by bolts, completing the overall sealing assembly of the equipment. At the same time, during the downward movement of the upper sealing plate 3, its bottom side support 89 abuts against the anti-slip groove on the top of the rotating frame 82, providing a friction transmission basis for the subsequent rotation and scraping operation of the anti-sand clamping mechanism 9. After the top-opening valve core mechanism 8 is opened, the petroleum medium inside the petroleum delivery pipe 16 passes through the detection pipe 2 through the central channel of the flow sleeve 81 and enters the outer annular space of the double-sleeve structure, completely immersing the sensor unit 12 probe installed in the through groove on the side wall of the inner sleeve 11. The equipment enters the normal online detection condition. The sensor unit 12 is composed of a controller connected to a capacitive sensor, a microwave sensor, a temperature sensor, and a pressure sensor. It can simultaneously perform multi-dimensional detection and analysis of the petroleum medium composition, water content, temperature, and pressure status. The surface of the sensor probe adopts a ceramic anti-corrosion coating process, which can effectively resist the long-term corrosion and erosion wear of the petroleum medium, greatly improve the corrosion resistance and service life of the probe, and ensure the long-term stable detection of the equipment. At the same time, the guide groove 10 on the side wall of the fixed sleeve 1 and the return port 13 on the edge of the lower sealing plate 7 cooperate with each other to form a closed-loop medium circulation flow path, realize the continuous circulation and renewal of the petroleum medium inside the cavity, and the guide groove 10 can regulate the flow of the medium, effectively avoid the accumulation of sand particles inside the cavity, stabilize the detection condition, and improve the detection accuracy. During online equipment testing, the pressure relief mechanism 6 adaptively balances the internal medium pressure in real time. Initially, in a non-pressurized state, the support spring 64 supports the piston plate 62 with its own elasticity, keeping the piston plate 62 stably positioned below the sealed shell 61. When pressure fluctuations occur in the oil delivery pipe 16, generating instantaneous high-pressure impacts, the internal pressure of the double-walled outer jacket instantly increases. When the medium pressure exceeds the supporting elasticity of the support spring 64, the high-pressure medium acts on the piston plate 62, pushing it to slide upwards along the inner wall of the sealed shell 61, simultaneously compressing the support spring 64 and storing elastic potential energy. The upward displacement of the piston plate 62 frees up excess cavity space, rapidly releasing the instantaneous high pressure, buffering the high-pressure impact, and preventing direct high-pressure... Acting on the sealing parts of the equipment, it significantly improves the equipment's resistance to pressure fluctuations and long-term operational reliability. During the pressure relief process, the piston plate 62 moves upward and pushes the gas inside the sealed shell 61 from the venting groove 60 into the inner sleeve 11, and finally discharges it outward through the protective screen plate 15 at the top of the upper sealing plate 3. When the high pressure impact in the pipeline disappears and the internal pressure of the outer jacket gradually drops back to the normal range, the support spring 64 rebounds and extends, pushing the piston plate 62 to slide downward and reset. At the same time, external air passes through the protective screen plate 15, the inner sleeve 11 and the venting groove 60 to replenish the inside of the sealed shell 61, completing one pressure relief cycle. The intermittent airflow generated by this reciprocating motion can continuously cool the detection space where the sensing unit 12 is located, avoiding the impact of heat accumulation in the cavity on the detection stability. During the entire equipment testing process, the reciprocating motion of the pressure relief mechanism 6, linked to the continuous operation of the anti-sand-clamping mechanism 9, enables automatic sand removal and anti-clamping functions at the sealing parts. During the process, after the equipment is pressed down for assembly and the lower support plate 86 moves down to release the seal, the flexible scraper 93 aligns with the sealing contact between the flow sleeve 81 and the sealing sleeve 87. When the pressure relief mechanism 6 is working, the piston plate 62 drives the guide rod 63 to vertically reciprocate, and the lifting ring 96 at the top of the guide rod 63 moves up and down synchronously, driving the rotating ring 97 and the side support rod 98 to move vertically synchronously. The guide groove 90 on the inner wall of the limiting shell 99 and the limiting frame 95... Under the limiting and guiding action of the longitudinal slide groove, the side support rod 98 generates circumferential torque while sliding vertically, pulling the limiting frame 95 and the rotating ring 97 to rotate, thereby driving the closing ring 94 to rotate synchronously. The closing ring 94 abuts against the anti-slip groove at the top of the rotating frame 82 through the side supports 89 evenly arranged at the bottom, and drives the rotating frame 82 to rotate circumferentially as a whole by friction. The rotating frame 82 drives the support frame 83 and the connecting ring 91 to rotate synchronously, so that the flexible scraper 93 at the end of the support rod 92 continuously scrapes circumferentially along the sealing position of the side wall of the flow sleeve 81, and removes the oil sand and impurities attached to the sealing part in real time. During later maintenance and repair of the equipment, the bolts fixing the upper sealing plate 3 and the fixed sleeve 1 are released, and the upper sealing plate 3 and the internal components are lifted upwards. The inner support 4 releases its pressure limit on the lower support plate 86. At this time, the locking spring 85 retracts and resets, pulling the lower support plate 86 upwards and resetting, causing the sealing sleeve 87 to re-seal the central oil inlet of the flow sleeve 81 from the bottom. At the same time, the sealing bracket 88 on the lower support plate 86 re-abuts against the bottom of the lower sealing plate 7, synchronously sealing the return port 13. The top-opening valve core mechanism 8 returns to a completely closed state, completely cutting off the channel for the petroleum medium to enter the detection chamber. Under the continuous scraping action of the anti-sand-entrapment mechanism 9, there are no sand particles or impurities remaining on the inner wall and sealing contact surface of the flow sleeve 81, which can effectively prevent sand particles from getting trapped between the sealing sleeve 87 and the flow sleeve 81 and damaging the sealing sleeve 87. This ensures the sealing reliability and operational stability of the equipment after repeated assembly from the source.

[0028] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A water content analyzer for petroleum testing, comprising a fixing sleeve (1), characterized in that: The fixing sleeve (1) is fixed to the top of the detection tube (2). The top of the fixing sleeve (1) is fixed with an upper sealing plate (3). A sealing element is provided at the connection between the upper sealing plate (3) and the fixing sleeve (1). A protective screen plate (15) is fixed on the upper sealing plate (3). An inner support (4) is fixed on the inner wall of the upper sealing plate (3). A lower housing (5) is fixed through the inner support (4). A pressure relief mechanism (6) is provided on the lower housing (5). A lower sealing plate (7) is fixed at the bottom of the fixing sleeve (1). A return port (13) is provided at the edge of the lower sealing plate (7), a guide groove (10) is provided on the side wall of the fixed sleeve (1), a top-opening valve core mechanism (8) is provided on the lower sealing plate (7), an anti-sand trapping mechanism (9) is connected to the top-opening valve core mechanism (8), an inner sleeve (11) is fixed on the top of the lower housing (5), a sensing unit (12) is installed on the top of the lower housing (5), and the probe of the sensing unit (12) is fixedly installed in the through groove on the side wall of the inner sleeve (11).

2. The water content analyzer for petroleum testing according to claim 1, characterized in that: The pressure relief mechanism (6) includes a closed shell (61) fixed on the lower shell (5), a piston plate (62) is slidably connected in the closed shell (61), the piston plate (62) is slidably connected on the inner support (4), and a venting groove (60) connected to the closed shell (61) is provided on the lower shell (5).

3. The water content analyzer for petroleum testing according to claim 2, characterized in that: A guide rod (63) is fixed to the top of the piston plate (62), and a support spring (64) sleeved on the guide rod (63) is provided between the piston plate (62) and the lower housing (5).

4. A water content analyzer for petroleum testing according to claim 3, characterized in that: The top-opening valve core mechanism (8) includes a flow sleeve (81) fixed on the lower sealing plate (7), a rotating frame (82) rotatably connected to the flow sleeve (81), a support frame (83) fixed on the rotating frame (82), and a center sleeve (84) rotatably connected to the support frame (83).

5. A water content analyzer for petroleum testing according to claim 4, characterized in that: A locking spring (85) is fixed at the bottom of the central sleeve (84). The locking spring (85) is fixed on the lower support plate (86). The lower support plate (86) is slidably connected to the support frame (83). The bottom end of the inner support (4) passes through the central sleeve (84) and abuts against the lower support plate (86). A sealing sleeve (87) is fixed on the lower support plate (86).

6. A water content analyzer for petroleum testing according to claim 5, characterized in that: The lower support plate (86) is slidably connected to the bottom of the lower sealing plate (7), and a sealing frame (88) for sealing the return port (13) is fixed on the lower support plate (86). The sealing frame (88) is slidably connected to the fixed sleeve (1).

7. A water content analyzer for petroleum testing according to claim 4, characterized in that: The anti-sand trapping mechanism (9) includes a connecting ring (91) rotatably connected to the lower support plate (86), and a support rod (92) is evenly arranged on the connecting ring (91). The support rod (92) slides through the support frame (83), and a flexible scraper (93) is fixed on the support rod (92) and abuts against the side wall of the flow sleeve (81).

8. A water content analyzer for petroleum testing according to claim 7, characterized in that: The top of the rotating frame (82) is uniformly provided with anti-slip grooves, and a side bracket (89) is abutted on the anti-slip groove. The side bracket (89) is uniformly fixed at the bottom of the closing ring (94). The closing ring (94) is sealed and rotatably connected between the upper sealing plate (3) and the inner sleeve (11). A limit frame (95) is fixed on the inner wall of the closing ring (94).

9. A water content analyzer for petroleum testing according to claim 8, characterized in that: The top end of the guide rod (63) passes through the lower housing (5) and is fixed with a lifting ring (96). A rotating ring (97) is rotatably connected to the lifting ring (96). A side support rod (98) is fixed to the rotating ring (97). The end of the side support rod (98) is slidably connected in the guide groove (90). The guide groove (90) is evenly opened on the inner wall of the limiting shell (99). The limiting shell (99) is fixed on the inner sleeve (11). The side support rod (98) is slidably connected in the longitudinal groove opened in the limiting frame (95).

10. A water content analyzer for petroleum testing according to claim 1, characterized in that: The detection tube (2) is connected to the oil delivery pipe (16) via a flange. An external support (14) is provided on the top of the detection tube (2), and a fixing sleeve (1) is fixedly connected to the external support (14).

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