Online sampling mechanism applicable to tank storage and pipeline transportation oil

Abstract

The invention relates to the technical field of oil sampling, and particularly discloses an on-line sampling mechanism suitable for tank storage and pipeline transportation oil, which comprises an oil pipe, a sampling cylinder communicated with the oil pipe, a piston connected in the sampling cylinder in a sliding and sealing manner, and a driving assembly for driving the piston to slide in the sampling cylinder in a sealing manner, a detection pool communicated with the oil pipe is formed between the piston and the end, close to the oil pipe, of the sampling cylinder, a trapezoidal cavity communicated with the detection pool is formed in the side wall of the sampling cylinder, the width of the side, close to the interior of the sampling cylinder, of the trapezoidal cavity is smaller than the length of the piston, and a Raman laser probe communicated with the detection pool is arranged on the side wall of the trapezoidal cavity; an observation window assembly capable of observing the state in the sampling cylinder is arranged on the side wall of the sampling cylinder, so that on-line monitoring on key physical and chemical indexes of the oil product under the conditions of storage and non-interference on normal transportation of a pipeline can be met, and a new means and approach are provided for guaranteeing the quality of the oil product; and the ever-increasing automatic, unmanned and rapid oil product detection requirements can be met.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of oil sampling, and particularly discloses an online sampling mechanism applicable to tank-stored and pipe-transported oil. BACKGROUND

[0002] Oil Raman spectrum detection is an analysis technology based on Raman scattering effect, which reveals molecular structure and component information through light and matter interaction, and has the characteristics of rapidity, non-destructiveness and high sensitivity. Through Raman spectrum detection of oil, vibration information of oil molecules can be analyzed, rapid non-destructive detection of oil type, components and quality is realized, and the online sampling mechanism has important value in the fields of petrochemical industry, quality control and industrial monitoring. At present, Raman spectrum-based detection of tank-stored and pipe-transported oil is mainly offline, and usually needs full-time personnel to be responsible for oil sample collection and transfer to a specific detection container for detection. The process is complex, and sample spilling or contamination is easy to occur. Meanwhile, the method has high personnel cost, high labor intensity and long detection time, and cannot meet the increasing requirements of automation, unmanned and rapidity for oil detection. Therefore, the application provides an online sampling mechanism applicable to tank-stored and pipe-transported oil to solve the above problems. SUMMARY

[0003] The application aims to solve the problems that in traditional Raman spectrum detection of tank-stored and pipe-transported oil, full-time personnel are needed to collect oil samples and transfer them to a specific detection container, and the process is complex and sample spilling or contamination is easy to occur.

[0004] In order to achieve the above purpose, the basic scheme of the application provides an online sampling mechanism applicable to tank-stored and pipe-transported oil, which comprises an oil pipe, a sampling cylinder in communication with the oil pipe, a piston slidingly and sealingly connected in the sampling cylinder and a driving assembly for driving the piston to sealingly slide in the sampling cylinder, a detection pool in communication with the oil pipe is formed between the piston and the sampling cylinder close to the oil pipe, a trapezoidal cavity in communication with the detection pool is arranged on the side wall of the sampling cylinder, the width of the trapezoidal cavity close to the inside of the sampling cylinder is smaller than the length of the piston, a Raman laser probe in communication with the detection pool is arranged on the side wall of the trapezoidal cavity, and an observation window assembly for observing the state in the sampling cylinder is arranged on the side wall of the sampling cylinder.

[0005] Further, an exhaust passage is arranged on the piston to guide the end of the sampling cylinder close to the oil pipe to the end of the sampling cylinder away from the oil pipe, a one-way valve is arranged in the exhaust passage to control the gas to flow only from the end of the sampling cylinder close to the oil pipe to the end of the sampling cylinder away from the oil pipe, and a bypass branch pipe in communication with the oil pipe is arranged on the side wall of the end of the sampling cylinder away from the oil pipe.

[0006] Further, a pagoda joint is arranged on the sampling cylinder to extend into the oil pipe and be in communication with the bypass branch pipe.

[0007] Further, the driving assembly comprises a motor and a ball screw pair driven by the motor, and the piston is connected with a piston rod connected with a sliding block in the ball screw pair and reciprocating linearly.

[0008] Further, the sampling cylinder comprises a lower cylinder body communicated with the oil pipe and an upper cylinder body arranged at the end of the lower cylinder body away from the oil pipe, and the top and bottom of the upper cylinder body are provided with oil seals and clamping springs matched with the piston rod.

[0009] Further, a blind plate connected with the oil pipe and a flange detachably connected with the blind plate are arranged between the lower cylinder body and the oil pipe, and the bottom of the lower cylinder body is connected with the flange.

[0010] Further, a filter screen is arranged inside the end of the blind plate close to the oil pipe.

[0011] Further, a gasket and a sealing ring are arranged between the flange and the blind plate.

[0012] Further, the observation window assembly is located at the same horizontal height as the trapezoidal cavity.

[0013] Further, the observation window assembly comprises a fixed sleeve arranged at the lateral wall of the sampling cylinder and at the same horizontal height as the trapezoidal cavity, a nylon holding column arranged at the outer wall of the fixed sleeve and connected with the lateral wall of the sampling cylinder, a lens arranged in the fixed sleeve, and a sealing ring arranged between the lens and the sampling cylinder.

[0014] The principle and effect of the scheme are that: The trapezoidal cavity arranged on the lateral wall of the sampling cavity can not only sample and detect the oil on line, but also avoid the accumulation of old oil and protect the detection accuracy, and the piston can be moved to the vicinity of the trapezoidal cavity through the driving assembly, so that the trapezoidal cavity is completely sealed by the piston, thereby providing conditions for taking out the lens for cleaning or replacement, realizing on-line replacement of the lens under pressure, and further improving the overall use convenience of the device.

[0015] The present application fully considers the influence of bubble accumulation in oil on the Raman detection accuracy, and an exhaust passage is arranged in the piston, and a one-way valve is designed on the exhaust passage to discharge the bubbles generated at the lower end surface of the piston upward, thereby effectively avoiding the influence of bubble accumulation at the front end of the Raman laser probe on the detection accuracy.

[0016] The present application is arranged between the sampling cylinder and the oil pipe, and a bypass branch pipe is arranged to form a pressure balance loop, which can balance the gas pressure at the upper and lower end surfaces of the piston, avoid the piston movement being blocked due to excessive pressure difference in the cylinder body, directly return the oil and gas generated by the reciprocating movement of the piston to the oil pipeline, avoid leakage hazards, and significantly improve the adaptability and reliability of the device under different working pressure conditions of the pipeline.

[0017] In order to ensure that the oil gas in the pressure balance circuit can be further discharged into the oil pipeline, a lotus joint in communication with the bypass branch pipe is arranged on the sampling cylinder, so that the oil gas can be further effectively discharged to avoid the risk of leakage.

[0018] The filter screen device is arranged at the inlet of the oil, and the particulate impurities in the oil can be filtered out through the device, so that the detection accuracy of the oil can be further ensured.

[0019] The modular design is adopted, the flange in detachable connection can be flexibly adapted to the installation requirement of the tee pipe with different pipe diameters, and the installation process does not need to be fired, so that the adaptation cost and operation risk can be greatly reduced.

[0020] In summary, the online monitoring of the key physical and chemical indexes of the oil under the conditions of storage and non-interference with the normal transportation of the pipeline can be realized, so that a new means and approach for ensuring the quality of the oil is provided, and the problems that in the Raman spectrum detection of the traditional tank storage and pipeline transportation oil, the oil sample needs to be collected by the full-time personnel and transferred to the specific detection container, the process is complex and easy to cause sample spilling or pollution can be solved, and the increasing demand for automatic, unmanned and rapid oil detection can be met. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating labor.

[0022] Figure 1 A schematic diagram of an online sampling mechanism suitable for tank storage and pipeline transportation oil is shown; Figure 2 A partial structure explosion diagram of an online sampling mechanism suitable for tank storage and pipeline transportation oil is shown; Figure 3 A schematic diagram of an upper sampling cylinder assembly of an online sampling mechanism suitable for tank storage and pipeline transportation oil is shown; Figure 4 A schematic diagram of a lower sampling cylinder assembly of an online sampling mechanism suitable for tank storage and pipeline transportation oil is shown; Figure 5 A piston connection schematic diagram of an online sampling mechanism suitable for tank storage and pipeline transportation oil is shown; Figure 6 A schematic diagram of a viewing window assembly of an online sampling mechanism suitable for tank storage and pipeline transportation oil is shown; Figure 7 Fig. 1 shows a schematic diagram of one sampling state of an online sampling mechanism for tank storage and pipeline oil according to an embodiment of the present application; Figure 8 Fig. 2 shows a schematic diagram of another sampling state of an online sampling mechanism for tank storage and pipeline oil according to an embodiment of the present application; Figure 9 Fig. 3 shows a schematic diagram of a lens replacement state of an online sampling mechanism for tank storage and pipeline oil according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0024] The reference signs in the drawings of the specification include: oil pipe 1, sampling cylinder 2, upper sampling cylinder assembly 3, upper cylinder body 301, first oil seal 302, second oil seal 303, first snap spring 304, second snap spring 305, lower sampling cylinder assembly 4, lower cylinder body 401, piston rod 402, piston 403, one-way valve 404, bypass branch pipe 405, Raman laser probe 406, third sealing ring 407, fourth sealing ring 408, first sealing ring 5, observation window assembly 6, second sealing ring 7, blind plate 8, piston rod assembly 9, gasket 10, flange 11, motor 12, mounting seat 13, shaft coupling 14, lead screw 15, trapezoidal cavity 16, explosion-proof shell 17, filter screen 18.

[0025] An online sampling mechanism for tank storage and pipeline oil, as shown in Figure 1 The online sampling mechanism includes oil pipe 1 and sampling cylinder 2 in communication with oil pipe 1, wherein oil pipe 1 is a pipeline or oil pipeline in communication with a storage tank to sample oil stored in the tank or being pumped into the tank.

[0026] As shown in Figure 2 The sampling cylinder 2 includes upper sampling cylinder assembly 3 and lower sampling cylinder assembly 4 connected to each other, wherein Figure 3As shown, the up-sampling cylinder assembly 3 includes an upper cylinder body 301, a first oil seal 302 and a second oil seal 303 respectively arranged at the top and bottom of the upper cylinder body 301, a first snap spring 304 and a second snap spring 305 respectively arranged at the top and bottom of the upper cylinder body 301; as shown by the push 4, the down-sampling cylinder assembly 4 includes a lower cylinder body 401, a piston rod group 9 connected with the lower cylinder body 401, the piston rod group 9 includes a piston 403 in sliding sealing connection with the lower cylinder body 401 and a piston rod 402 connected with the piston 403, the piston rod 402 cooperates with the first oil seal 302, the second oil seal 303, the first snap spring 304 and the second snap spring 305 of the upper cylinder body 301, the piston 403 divides the lower cylinder body 401 into an upper chamber and a lower chamber, the lower chamber is in communication with the oil pipe 1, the top side wall of the upper chamber is provided with a bypass branch pipe 405 in communication with the oil pipe 1, and the bottom of the lower cylinder body 401 is provided with a pagoda joint extending into the oil pipe 1 and in communication with the bypass branch pipe 405, the upper chamber is filled with air and is provided with an air nozzle; the piston 403 is provided with an exhaust passage between the upper surface and the lower surface of the piston 403, and the exhaust passage is provided with a one-way valve 404 for controlling the gas to flow from the lower chamber to the upper chamber.

[0027] As shown in Figure 2 , the top of the lower cylinder body 401 is provided with a first sealing ring 5 matched with the upper cylinder body 301, the lower cylinder body 401 and the oil pipe 1 are provided with a blind plate 8 connected with the oil pipe 1 and a flange 11 detachably connected with the blind plate 8, and the bottom of the lower cylinder body 401 is connected with the flange 11 through a gasket and a second sealing ring 7. Figure 5 As shown in , the top and bottom outer walls of the piston 403 are provided with sealing grooves, and the sealing grooves are respectively provided with a third sealing ring 407 and a fourth sealing ring 408.

[0028] Figure 2 As shown in Figure 6 , the side wall of the lower cylinder body 401 is provided with an observation window assembly 6, the observation window assembly 6 includes a fixed sleeve arranged on the side wall of the lower cylinder body 401, a nylon holding column arranged on the outer wall of the fixed sleeve and connected with the side wall of the lower cylinder body 401, a lens arranged in the fixed sleeve, and a fifth sealing ring arranged between the lens and the lower cylinder body 401. Figure 4 , Figure 7 , Figure 8As shown, in this embodiment, the lower chamber of the lower cylinder body 401 is a detection pool, the side wall of the lower cylinder body 401 is outwardly convex to form a trapezoidal cavity 16 in communication with the detection pool, the observation window assembly 6 and the trapezoidal cavity 16 are located at the same horizontal height, the width of the side of the trapezoidal cavity 16 close to the detection pool is smaller than the length of the piston 403, the side wall of the trapezoidal cavity 16 is provided with a Raman laser probe 406 in communication with the detection pool, and the inside of the end of the blind plate 8 close to the oil pipe 1 is provided with a filter screen; the movement of the piston 403 is driven by a driving assembly, the driving assembly includes a motor 12, a mounting seat 13 for fixing the motor 12, a shaft coupling 14 arranged at the output end of the motor 12, a ball screw pair 15 connected with the output end of the motor 12 through the shaft coupling 14, a screw 15 in the ball screw pair 15 is connected with the output end of the motor 12 through the shaft coupling 14, a sliding seat in the ball screw pair 15 is matched with the screw 15 and connected with the piston rod 402, and guide rods in the ball screw pair 15 position and guide the sliding seat. An explosion-proof shell 17 is arranged outside the sampling cylinder 2 and the driving assembly for protection.

[0029] As shown in Figure 7 and Figure 8 , the ball screw pair 15 is driven by the motor 12 to operate, so that the piston 403 performs multiple reciprocating movements. On the one hand, this process can realize the rinsing of the trapezoidal cavity 16 and the detection pool, and on the other hand, it can further discharge the gas in the sampling cylinder 2; after the rinsing is completed, the piston 403 is slowly moved upward by the motor 12 to collect the oil sample, the oil is filtered by the bottom filter screen during this process, and the motor 12 stops driving when the piston 403 reaches the top dead center, at which time the oil fills the trapezoidal cavity 16 and the detection pool, and the Raman laser can be controlled to be turned on for oil detection. When the Raman detection is completed, the motor 12 is started to drive the ball screw pair 15 to push the piston 403 to the bottom end, and then the motor 12 is turned off. At this time, the oil in the sampling mechanism is pushed back into the oil pipe 1. During the downward movement of the piston 403, due to airflow disturbance, part of the gas may enter the trapezoidal detection pool. When the piston 403 reaches the bottom, the detection pool is in communication with the space above the body of the sampling cylinder 2. At this time, the residual gas in the detection pool can flow into the upper space and be discharged into the oil pipe 1 through the bypass branch pipe 405 during the next upward movement of the piston 403.

[0030] As shown in Figure 9 , when the lens is replaced, the motor 12 is started to drive the ball screw pair 15 to control the piston 403 to advance to the middle position of the sampler, and to ensure that the upper and lower end faces of the piston 403 seal the trapezoidal detection pool area, and then the motor 12 is turned off. At this time, the pressure of the upper and lower ends of the piston 403 is balanced, and the piston 403 is in a stationary state. Since the volume of the trapezoidal detection pool is small, the laser probe can be slowly rotated out at this time, and a small amount of oil leaking out can be absorbed by the oil absorption paper at the same time, so that the cleaning and replacement of the Raman detection unit can be realized without interfering with the oil delivery.

[0031] In conclusion, the embodiment can meet the online monitoring of key physical and chemical indexes of oil products under the condition of storage and without interfering with the normal transportation of pipelines, thereby providing a new means and approach for guaranteeing the quality of oil products, and effectively solving the problems of complex process, sample spilling or contamination caused by the need for full-time personnel to collect oil samples and transfer them to specific detection containers in the traditional Raman spectrum detection of tank storage and pipeline transportation oil, and meeting the growing demand for automated, unmanned and rapid oil detection.

[0032] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make slight changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any indirect modification, equivalent change and modification of the above embodiments made in accordance with the technical essence of the present application still fall within the scope of the technical solution of the present application.

Claims

1. An online sampling mechanism applicable to tank storage and pipeline oil, characterized by: The utility model comprises an oil pipe, a sampling cylinder connected to the oil pipe, a piston slidably and sealably connected to the sampling cylinder, and a driving assembly driving the piston to slide sealably in the sampling cylinder. A detection pool connected to the oil pipe is formed between the piston and the sampling cylinder near one end of the oil pipe. A trapezoidal cavity connected to the detection pool is provided on the side wall of the sampling cylinder. The width of the side of the trapezoidal cavity close to the sampling cylinder is smaller than the length of the piston. A Raman laser probe connected to the detection pool is provided on the side wall of the trapezoidal cavity. An observation window assembly for observing the state inside the sampling cylinder is provided on the side wall of the sampling cylinder.

2. The online sampling mechanism applicable to tank storage and pipeline oil according to claim 1, characterized in that: The piston is also provided with an exhaust passage connecting the end of the sampling cylinder close to the oil pipe with the end of the sampling cylinder away from the oil pipe. A one-way valve is provided in the exhaust passage to control the gas to flow only from the end of the sampling cylinder close to the oil pipe to the end of the sampling cylinder away from the oil pipe. A bypass branch pipe connected to the oil pipe is provided on the side wall of the end of the sampling cylinder away from the oil pipe.

3. The online sampling mechanism applicable to tank storage and pipeline oil according to claim 2, characterized in that: The sampling cylinder is provided with a pagoda joint which extends into the oil pipe and is connected with the bypass branch pipe.

4. The online sampling mechanism applicable to tank storage and pipeline oil according to claim 1, characterized in that: The driving assembly includes a motor and a ball screw pair driven by the motor. The piston is connected to a piston rod connected to a slider in the ball screw pair and capable of reciprocating linear motion.

5. The online sampling mechanism applicable to tank storage and pipeline oil according to claim 4, characterized in that: The sampling cylinder includes a lower cylinder body connected to the oil pipe and an upper cylinder body arranged at an end of the lower cylinder body away from the oil pipe. The top and bottom of the upper cylinder body are both provided with oil seals and retaining springs that cooperate with the piston rod.

6. The online sampling mechanism applicable to tank storage and pipeline oil according to claim 5, characterized in that: A blind plate connected to the oil pipe and a flange detachably connected to the blind plate are provided between the lower cylinder body and the oil pipe, and the bottom of the lower cylinder body is connected to the flange.

7. The online sampling mechanism applicable to tank storage and pipeline oil according to claim 6, characterized in that: A filter is provided inside the blind plate at one end close to the oil pipe.

8. The online sampling mechanism applicable to tank storage and pipeline oil according to claim 6, characterized in that: A gasket and a sealing ring are provided between the flange and the blind plate.

9. The online sampling mechanism applicable to tank storage and pipeline oil according to claim 1, characterized in that: The observation window assembly and the trapezoidal cavity are located at the same level.

10. The online sampling mechanism applicable to tank storage and pipeline oil according to claim 9, characterized in that: The observation window assembly includes a fixing sleeve arranged on the side wall of the sampling cylinder and at the same level as the trapezoidal cavity, a nylon holding column arranged on the outer wall of the fixing sleeve and connected to the side wall of the sampling cylinder, a lens arranged in the fixing sleeve, and a sealing ring arranged between the lens and the sampling cylinder.

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