A split sampling device and sampling system

Abstract

This application discloses a diversion sampling device and sampling system, comprising: a valve body having a valve cavity inside, the valve body having an inflow channel, a first outflow channel, and a second outflow channel communicating with the valve cavity; a valve core movably disposed within the valve cavity, the valve core including a diversion part facing the inflow channel to divide the port connecting the inflow channel and the valve cavity into a first port and a second port; and a driving device, drivenly connected to the valve core to adjust the flow cross-sectional area of ​​the first port and the flow cross-sectional area of ​​the second port. By setting the valve core within the valve cavity and using the diversion part of the valve core to divide the port of the inflow channel into a first port and a second port, the diversion part diverts the medium in the inflow channel and flows it into the corresponding channel to achieve diversion sampling. Furthermore, the driving device drives the valve core to move, simultaneously adjusting the opening degree of the first port and the second port, enabling stable and continuous proportional sampling of the medium according to sampling requirements.

Description

Technical Field

[0001] This application relates to the field of process pipeline sampling technology, and in particular to a diversion sampling device and sampling system. Background Technology

[0002] In industries such as alumina and mining metallurgy, it is necessary to accurately detect the solid content (concentration) and particle size distribution (particle size ratio) of slurry in high-temperature and high-pressure pipelines during the production process in order to guide production control.

[0003] In related technologies, the valves used during sampling are difficult to distribute the sampling flow rate stably and continuously, resulting in large sampling deviations and poor sample representativeness. Moreover, under high temperature and high pressure environments, ordinary valve bodies are prone to thermal deformation, and the sealing structure is at high risk of failure, posing safety hazards. Summary of the Invention

[0004] This application aims to solve one of the technical problems existing in the prior art. To this end, this application proposes a diversion sampling device and sampling system.

[0005] In a first aspect, this application proposes a shunt sampling device, comprising: The valve body has a valve cavity inside, and the valve body is provided with an inflow channel, a first outflow channel and a second outflow channel that communicate with the valve cavity; The valve core is movably disposed within the valve cavity. The valve core includes a flow divider portion, which is disposed toward the inflow channel to divide the port connecting the inflow channel and the valve cavity into a first port near the first outflow channel and a second port near the second outflow channel. The drive unit is connected to the valve core drive and drives the valve core to move relative to the valve body, so as to simultaneously adjust the flow cross-sectional area of ​​the first port and the flow cross-sectional area of ​​the second port.

[0006] In some embodiments, the valve core is rotatable, and the driving device drives the valve core to rotate.

[0007] In some embodiments, the valve cavity is cylindrical, and the inflow channel, the first outflow channel and the second outflow channel all extend radially along the valve cavity, and the valve core rotates about the axis of the valve cavity. The flow divider has two guide surfaces that correspond to the first outflow channel and the second outflow channel, respectively.

[0008] In some embodiments, the two guide surfaces are angled together, and along the axial direction of the valve cavity, the cross-sectional width of the diversion section increases from the end closer to the inflow channel to the end farther from the inflow channel.

[0009] In some embodiments, two guide surfaces are spaced apart near one end of the inflow channel, and a flow-facing surface is connected between the two guide surfaces near one end of the inflow channel. The flow-facing surface is an arc-shaped curved surface coaxial with the inner wall of the valve cavity.

[0010] In some embodiments, along the valve cavity axial direction, the length of the diversion portion is greater than the diameter of the port; and / or, The axial length of the valve cavity is greater than the diameter of the port, and the valve core also includes assembly parts distributed axially at both ends of the flow divider. The assembly part is cylindrical, and its axis is collinear with the valve cavity axis. The diameter of the assembly part is adapted to the inner diameter of the valve cavity so that the assembly part fits in close contact with the inner wall of the valve cavity.

[0011] In some embodiments, the valve core includes: The backflow surface is positioned opposite to the flow divider. The surface of the backflow surface that faces away from the flow divider is an arc-shaped curved surface coaxial with the inner wall of the valve cavity, used to fit and contact the inner wall of the valve cavity.

[0012] In some embodiments, the axis of the inflow channel is perpendicular to the axis of the first outflow channel when projected axially along the valve cavity, and the axis of the first outflow channel is collinear with the axis of the second outflow channel.

[0013] Secondly, this application proposes a sampling system, including the diversion sampling device proposed in the first aspect; The sampling tube is connected at one end to the slurry pipeline and at the other end to the diversion sampling device. A sampling container is provided corresponding to the first outflow channel and is used to collect slurry.

[0014] In some embodiments, the sampling tube includes: a regulating valve disposed on the sampling tube; and a liquid level sensor disposed on the sampling container. The control unit is electrically connected to the level sensor, the drive unit, and the regulating valve. The control unit is used to control the operation of the drive unit and the regulating valve based on the level signal from the level sensor.

[0015] Compared to existing technologies, the diversion sampling device proposed in this disclosure has an inflow channel, a first outflow channel, and a second outflow channel connected to the valve cavity on the valve body; and a valve core is installed in the valve cavity. The diversion part of the valve core divides the port of the inflow channel into a first port and a second port, with the first port and the second port corresponding to the first outflow channel and the second outflow channel, respectively. The diversion part automatically diverts the medium in the inflow channel and flows it into the corresponding channel, so that the flow distribution ratio depends only on the ratio of the flow cross-sectional areas of the two ports, and is independent of the resistance difference between the downstream sampling pipeline and the discharge pipeline. This avoids the problem of unstable flow or even backflow in the sampling pipe due to the low resistance of the discharge pipe in the traditional three-way structure, so as to achieve proportional diversion sampling. When the valve core is driven by the driving device, the flow cross-sectional areas of the first port and the second port are adjusted simultaneously. Since the movement of the valve core can achieve stepless displacement, the ratio of the cross-sectional areas of the two ports also changes continuously. The operator can accurately set the ratio of sampling flow rate to discharge flow rate by controlling the position of the valve core, so as to perform stable and continuous proportional sampling of the medium according to the sampling requirements. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the shunt sampling device provided in the embodiments of this application; Figure 2 This is a schematic AA cross-sectional view of the shunt sampling device provided in the embodiments of this application.

[0017] Figure label: 10. Valve body; 11. Inflow channel; 12. First outflow channel; 13. Second outflow channel; 14. Housing; 15. First end cap; 16. Second end cap 20. Valve core; 21. Flow divider; 211. Guide surface; 212. Flow-facing surface; 22. Assembly part; 23. Flow-returning surface; 24. First rotating end; 25. Second rotating end; 26. Seal; 27. Wear-resistant bushing; 30. First port; 40. Second port; 50. Drive unit; 51. Limit adjusting bolt; 60. Support sleeve. Detailed Implementation

[0018] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0019] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0020] In industries such as alumina and mining metallurgy, it is necessary to accurately detect the solid content (concentration) and particle size distribution (particle size ratio) of slurry in transportation pipelines to guide production control. Since the medium transported in pipelines is a high-temperature, high-pressure, and highly abrasive solid-liquid mixture, the sampling devices installed on the pipelines need to be wear-resistant and erosion-resistant, and also capable of precise adjustment of the sampling flow rate.

[0021] The ball valves or gate valves used in existing sampling devices are prone to internal leakage due to rapid wear of the sealing surface and flow channel under long-term scouring and erosion of high-speed slurry. Most valves with adjustable functions are still limited to multi-stage operation, making it difficult to achieve continuous and stable proportional distribution of sampling flow rate. This results in large sampling deviation and poor sample representativeness, which cannot support the precise detection of indicators such as solid content and particle size distribution in fine process control.

[0022] To address at least one of the aforementioned problems, this disclosure proposes a diversion sampling device and sampling system.

[0023] like Figure 1 and Figure 2 As shown, in a first aspect, this application proposes a shunt sampling device, comprising: The valve body 10 has a valve cavity inside, and the valve body 10 is respectively provided with an inflow channel 11, a first outflow channel 12 and a second outflow channel 13 communicating with the valve cavity; The valve core 20 is movably disposed in the valve cavity. The valve core 20 includes a diversion part 21, which is disposed toward the inflow channel 11 to divide the port connecting the inflow channel 11 and the valve cavity into a first port 30 near the first outflow channel 12 and a second port 40 near the second outflow channel 13. The drive device 50 is connected to the valve core 20 and drives the valve core 20 to move relative to the valve body 10, so as to simultaneously adjust the flow cross-sectional area of ​​the first port 30 and the flow cross-sectional area of ​​the second port 40.

[0024] Understandably, the shunt sampling device is installed in the sampling branch pipeline of the main pipeline; The valve body 10 has a valve cavity, which serves as a space for media diversion and regulation. The valve body 10 has three channels communicating with the valve cavity: an inflow channel 11, a first outflow channel 12, and a second outflow channel 13. The inflow channel 11 is used to connect to the upstream branch pipeline, so that the solid-liquid mixed medium in the main pipeline flows into the valve chamber; the first outflow channel 12 can be used to connect to the sampling pipeline, so that the diverted medium is introduced into the sampling container; the second outflow channel 13 can be used to connect to the discharge pipeline, so that the remaining diverted medium is introduced into the return system or the low-pressure discharge area.

[0025] In this design, the inflow channel 11 and the second outflow channel 13 have the same diameter, both larger than the first outflow channel 12. In this case, the first outflow channel 12 serves as a sampling channel, and the second outflow channel 13 serves as a discharge channel. For example, the inflow channel 11 can have a diameter of DN40, the first outflow channel 12 can have a diameter of DN15, and the second outflow channel 13 can have a diameter of DN40.

[0026] The medium enters the valve chamber through the inflow channel 11. When no sampling is performed, the medium flows out through the second outflow channel 13 when the first inflow channel 11 (sampling channel) is closed. The inflow channel 11 and the second outflow channel 13 have the same diameter, which can prevent the medium from being blocked in the solid-liquid two-phase flow.

[0027] The sampling channel diameter is much smaller than the inflow and outflow channels. The sampling channel diameter limits the maximum sampling flow rate, preventing a large amount of medium from rushing into the sampling container during sampling, causing splashing or overfilling. Even when the valve core 20 is fully open, the flow capacity of the sampling channel is much smaller than that of the outflow channel, ensuring that most of the medium still flows away from the outflow channel, and the sampling volume is controllable.

[0028] Furthermore, when the medium enters the sampling channel with a smaller diameter from the inflow channel 11 through the valve cavity, the flow channel suddenly contracts, which can produce a significant throttling effect, thereby further reducing the pressure. The smaller sampling diameter, combined with the precise adjustment of the valve core 20, can match the sampling flow rate with the main pipeline flow rate, achieving isokinetic sampling and avoiding the sedimentation or segregation of solid particles caused by excessively low sampling flow rate, thus ensuring that the sample composition is consistent with the medium in the pipeline.

[0029] The valve core 20 is movably disposed within the valve cavity. The valve core 20 includes a flow divider 21, which is correspondingly disposed with respect to the inflow channel 11. Projected along the direction in which the medium enters the inflow channel 11, the valve core 20 divides the port connecting the inflow channel and the valve cavity into two independent ports: a first port 30 and a second port 40. The first port 30 is located near the first outflow channel 12, and the medium flowing through the first port 30 enters the first outflow channel 12 (sampling channel). The second port 40 is located near the second outflow channel 13, and the medium flowing through this port enters the second outflow channel 13 (discharge channel).

[0030] The shape of the flow divider 21 can be wedge-shaped or cone-shaped. The flow divider 21 can smoothly divide the medium at the moment it enters the valve cavity, avoiding turbulence or deposition of the medium in the valve cavity.

[0031] The drive device 50 is connected to the valve core 20 for driving the valve core 20 to rotate or move linearly relative to the valve body 10. The drive device 50 can be a manually operated handwheel or handle, or an electric, pneumatic or hydraulic actuator. A pneumatic actuator is preferred to meet the automation control requirements under different working conditions.

[0032] The outer wall of the valve core 20 and the inner wall of the valve cavity are coated with a wear-resistant and corrosion-resistant layer. The material can be tungsten carbide, alumina ceramic, or silicon carbide ceramic coating to resist the erosion and corrosion of the medium (high temperature and high pressure slurry, etc.). The thickness of the wear-resistant and corrosion-resistant layer can be 0.3 mm. The bonding strength between the wear-resistant and corrosion-resistant layer and the substrate is >70 MPa, and the porosity is <1%.

[0033] The valve body 10 can be machined from 316L stainless steel forgings, and the valve core 20 can be made of high-strength precipitation hardening stainless steel.

[0034] Work process: Before sampling, the drive device 50 adjusts the valve core 20 to the position where the first port 30 is completely closed, so that the medium in the branch pipeline flows into the valve chamber from the second port 40 and then flows out from the second outflow channel 13 (discharge channel). At this time, the branch pipeline maintains continuous flow to prevent sedimentation and blockage.

[0035] During sampling, the drive unit 50 moves the valve core 20 to open the first port 30. At the same time, the second port 40 is partially closed but remains connected to the second outflow channel 13. The medium can be diverted to the first outflow channel 12 (sampling channel) according to a set ratio and enter the sampling container. The operator can adjust the position of the valve core 20 as needed to control the sampling flow rate.

[0036] After sampling, the drive device 50 resets the valve core 20 to the position where the first port 30 is completely closed, cuts off the first outflow channel 12 (sampling channel), and completes the sampling.

[0037] During the sampling process, since the valve core 20 includes a diversion section 21, the medium is diverted the moment it enters the valve cavity and is directed to the first outflow channel 12 and the second outflow channel 13 respectively.

[0038] The flow ratio of the medium is determined by the size of the flow cross-sectional area when the first port 30 and the second port 40 are simultaneously connected to the valve cavity.

[0039] When the drive device 50 drives the valve core 20 to move in the direction of the first outflow channel 12, the flow cross-sectional area of ​​the first port 30 decreases, the second port 40 increases accordingly, the flow rate entering the first outflow channel 12 (sampling channel) decreases, and the flow rate entering the second outflow channel 13 (emission channel) increases.

[0040] When the drive device 50 drives the valve core 20 to move towards the second outflow channel 13, the flow cross-sectional area of ​​the first port 30 increases, the second port 40 decreases accordingly, the flow rate entering the first outflow channel 12 (sampling channel) increases, and the flow rate entering the second outflow channel 13 (emission channel) decreases.

[0041] Since the cross-sectional areas of the first port 30 and the second port 40 change continuously and in tandem, the operator can steplessly adjust the ratio of sampling flow rate to discharge flow rate through the drive device 50 to achieve precise control of the sampling amount.

[0042] The diversion sampling device disclosed herein comprises an inflow channel 11, a first outflow channel 12, and a second outflow channel 13 communicating with the valve cavity on a valve body 10; a valve core 20 is disposed within the valve cavity, and a diversion section 21 of the valve core 20 divides the port of the inflow channel 11 into a first port 30 and a second port 40, with the first port 30 and the second port 40 corresponding to the first outflow channel 12 and the second outflow channel 13, respectively. The diversion section 21 automatically diverts the medium within the inflow channel 11 into the corresponding channels, ensuring that the flow distribution ratio depends only on the ratio of the cross-sectional areas of the two ports. It is independent of the resistance difference between the downstream sampling pipeline and the discharge pipeline, thus avoiding the problem of unstable flow or even backflow in the sampling pipeline caused by the low resistance of the discharge pipeline in the traditional three-way structure. This enables proportional flow splitting sampling. When the valve core 20 is driven by the drive device 50, the flow cross-sectional area of ​​the first port 30 and the second port 40 is adjusted simultaneously. Since the movement of the valve core 20 can achieve stepless displacement, the ratio of the cross-sectional areas of the two ports also changes continuously. The operator can accurately set the ratio of sampling flow rate to discharge flow rate by controlling the position of the valve core 20, so as to achieve stable and continuous proportional distribution sampling of the medium according to the sampling requirements.

[0043] In some embodiments, the valve core 20 is rotatable, and the driving device 50 drives the valve core 20 to rotate.

[0044] Understandably, the valve core 20 is rotatably mounted in the valve cavity, and the driving device 50 drives the valve core 20 to rotate so as to simultaneously adjust the flow cross-sectional area of ​​the first port 30 and the second opening.

[0045] The output end of the drive device 50 is rotatably connected to the valve core 20 so that the valve core 20 rotates under the drive of the drive device 50. The diversion part 21 can be wedge-shaped with its tip facing the inflow channel 11 when projected along the axial direction of the output end of the drive device 50. When the drive device 50 drives the valve core 20 to rotate around the axis of the output end, when the flow divider 21 is biased towards the first outflow channel 12, the flow cross-sectional area of ​​the first port 30 decreases and the flow cross-sectional area of ​​the second port 40 increases. When the diversion section 21 is biased towards the second outflow channel 13, the cross-sectional area of ​​the first port 30 increases and the cross-sectional area of ​​the second port 40 decreases. The operator can accurately set the distribution ratio of the sampling flow rate and the discharge flow rate by controlling the rotation angle of the valve core 20.

[0046] During rotation, the diversion section 21 forms a shearing action with the edge of the port, which can prevent particles in the medium from accumulating or getting stuck at the port.

[0047] In some embodiments, the valve cavity is cylindrical, and the inflow channel 11, the first outflow channel 12 and the second outflow channel 13 all extend radially along the valve cavity, and the valve core 20 rotates about the axis of the valve cavity; the diversion section 21 has two guide surfaces 211 corresponding to the first outflow channel 12 and the second outflow channel 13 respectively.

[0048] Understandably, the valve body 10 is machined into a cylindrical valve cavity, with the axial direction of the valve cavity being the rotation axis of the valve core 20. Furthermore, the inflow channel 11, the first outflow channel 12, and the second outflow channel 13 all extend radially along the valve cavity, such that the connection ports of the three channels with the valve cavity are all located on the cylindrical surface of the valve cavity. The shape of the ports connecting the three channels 11, 12, and 13 with the valve cavity can be circular or elliptical.

[0049] The valve core 20 is assembled inside the valve cavity, and part of the valve core 20 is adapted to the cylindrical valve cavity, so that the valve core 20 can rotate around the axis of the valve cavity to drive the flow divider 21 to rotate. The flow divider 21 has two guide surfaces 211, one of which corresponds to the first outflow channel 12 and is used to guide the medium into the first outflow channel 12, and the other guide surface 211 corresponds to the second outflow channel 13 and is used to guide the medium into the second outflow channel 13.

[0050] The flow divider 21 is located between the two guide surfaces 211, and the portion facing the inflow channel 11 is the flow-facing portion, which is used to divide the medium flow stream. The guide surface 211 can be a plane or an arc surface. The guide surface 211 is used to make the medium flow smoothly when it flows through the guide surface 211, to gently change direction, and to reduce eddies or local high-speed scouring.

[0051] The medium flows from the inflow channel 11 into the valve cavity and impacts the flow-facing portion at the upper end of the diversion portion 21 of the valve core 20, so as to divide the medium flow into two independent medium branches, which flow along the two guide surfaces 211 to the first outflow channel 12 and the second outflow channel 13 respectively.

[0052] In some embodiments, the axis of the inflow channel 11 is perpendicular to the axis of the first outflow channel 12 when projected axially along the valve cavity, and the axis of the first outflow channel 12 is collinear with the axis of the second outflow channel 13.

[0053] Understandably, when viewed axially along the valve cavity, the inflow channel 11, the first outflow channel 12, and the second outflow channel 13 are positioned perpendicularly to each other on the projection plane, meaning the angle between them is 90°. The axis of the first outflow channel 12 is collinear with the axis of the second outflow channel 13. Circumferentially, the first outflow channel 12 and the second outflow channel 13 are spaced 180° apart. Furthermore, on the valve body 10, the first outflow channel 12 and the second outflow channel 13 are also positioned opposite each other.

[0054] The above-described layout of the three flow channels minimizes the flow path and turning angle of the medium within the valve cavity. It also reduces the number of impacts and residence time of solid particles in the medium within the valve cavity, thereby reducing wear on the valve body 10 and valve core 20 and extending the service life of the device.

[0055] In some embodiments, the two guide surfaces 211 are angled, and along the axial direction of the valve cavity, the cross-sectional width of the diversion portion 21 tends to increase from the end closer to the inflow channel 11 to the end farther away from the inflow channel 11.

[0056] Understandably, the two guide surfaces 211 are set at an angle, and this included angle forms an arc surface or a sharp diversion ridge at the flow-facing end, so that the medium is instantly divided into two streams when it impacts the diversion section 21, and flows along the guide surface 211 to the first outflow channel 12 and the second outflow channel 13 respectively.

[0057] At the end of the flow divider 21 closest to the inflow channel 11, i.e., the upper end (the flow-facing part), the cross-sectional width is smaller, forming a sharp or arc-shaped upper end. At the end furthest from the inflow channel 11, i.e., the lower end of the flow divider 21, the cross-sectional width gradually increases to form a wider base. Viewed from the axial projection of the valve cavity, the flow divider 21 is wedge-shaped, narrower at the top and wider at the bottom, so that the medium can be smoothly diverted and diffused to the port of the entire flow channel after being divided. This allows the impact angle of solid particles in the medium on the guide surface 211 to gradually change, thereby dispersing the impact energy, reducing concentrated wear on specific areas of the guide surface 211, and evenly distributing the wear area to extend the service life of the flow divider 21.

[0058] Furthermore, the lower end of the diversion section 21 is wider, increasing the contact area with the inner wall of the valve body 10, and transferring the impact force of the medium to the valve body 10 through the wider lower end, thereby improving the stability of the valve core 20 under high pressure impact conditions.

[0059] After the medium enters radially from the inflow channel 11, it directly impacts the flow-facing section at the upper end of the diversion section 21 and is diverted. After smoothly turning 90° along the angled guide surface 211, it enters the first outflow channel 12 and the second outflow channel 13 that flow radially out.

[0060] In some embodiments, two guide surfaces 211 are spaced apart near one end of the inflow channel 11, and a flow-facing surface 212 is connected between the two guide surfaces 211 near one end of the inflow channel 11. The flow-facing surface 212 is an arc-shaped curved surface coaxial with the inner wall of the valve cavity.

[0061] Understandably, a flow-facing surface 212 is provided at the interval between the two flow-guiding surfaces 211. The flow-facing surface 212 is the surface of the flow-facing part facing the inflow channel 11. The flow-facing surface 212 smoothly connects the two flow-guiding surfaces 211, and the flow-facing surface 212 is an arc-shaped curved surface and is coaxially set with the cylindrical surface of the valve cavity.

[0062] When the medium flows into the valve cavity, it first contacts the flow-facing surface 212, and then is evenly distributed along the arc-shaped surface to the guide surfaces 211 on both sides of the flow-facing surface 212. The flow-facing surface 212 can distribute the impact load to the entire arc-shaped area, thereby reducing the local wear of the medium on the diversion part 21 and extending the effective service life of the diversion part 21.

[0063] When sampling is completed and the first outflow channel 12 used for sampling needs to be closed, the drive device 50 drives the valve core 20 to rotate the diversion section 21 toward the first outflow channel 12 until the flow-facing surface 212 of the diversion section 21 rotates from an open state toward the inflow channel 11 to the inner wall of the valve cavity between the open state of the first outflow channel 12 and the open state of the inflow channel 11, and comes into contact with the inner wall, so that the first outflow channel 12 and the inflow channel 11 are closed. At this time, the medium flows entirely toward the second outflow channel 13 via the guide surface 211 toward the second outflow channel 13.

[0064] In some embodiments, the length of the diversion portion 21 along the valve cavity axial direction is greater than the diameter of the port; and / or, the axial length of the valve cavity is greater than the diameter of the port, and the valve core 20 further includes assembly portions 22 distributed axially at both ends of the diversion portion 21. The assembly part 22 is cylindrical, and its axis is collinear with the valve cavity axis. The diameter of the assembly part 22 is adapted to the inner diameter of the valve cavity so that the assembly part 22 fits into contact with the inner wall of the valve cavity.

[0065] Understandably, along the axial direction of the valve cavity, the extension dimension of the diverter 21 in the axial direction of the valve cavity is greater than the diameter of the inflow channel 11 port. The diameter of the inflow channel 11 port refers to the size of the circular or near-circular opening at the connection with the valve cavity. The diverter 21 completely covers the inflow channel 11 port in the axial direction of the valve cavity, effectively diverting the medium after it enters the valve cavity from the inflow channel 11.

[0066] Furthermore, the axial extension dimension of the diversion section 21 in the valve cavity is also larger than the diameter of the port where the first outflow channel 12 and the second outflow channel 13 connect to the valve cavity. For example, the size of the circular or near-circular opening at the connection between the first outflow channel 12 and the second outflow channel 13 and the valve cavity, so that the diverted medium is completely guided into the corresponding outflow channel through the guide surfaces 211 on both sides of the diversion section 21, avoiding turbulence or accumulation.

[0067] The axial length of the valve cavity is greater than the port diameter, providing axial mounting space for the valve core 20. At both ends of the flow divider 21, the valve core 20 has mounting portions 22 along the axial direction of the valve cavity. The mounting portions 22 are cylindrical, and their axes are collinear with the valve cavity axis. The outer diameter of the mounting portions 22 matches the inner diameter of the valve cavity, allowing them to fit snugly against the inner wall of the valve cavity. This snug contact can be a precise clearance fit or a slight interference fit, enabling the valve core 20 to be stably assembled with the valve body 10 while also allowing relative rotation.

[0068] The cylindrical assembly part 22 forms a shaft-hole mating structure with the cylindrical valve cavity, ensuring that the valve core 20 rotates around a fixed axis within the valve cavity. This results in high radial positioning accuracy between the valve core 20 and the valve cavity, and smooth rotation. Furthermore, the assembly parts 22 located at both ends of the flow divider 21 form a double-support structure, ensuring that the valve core 20 is subjected to uniform axial force, preventing the valve core 20 from wobbling or jamming.

[0069] In some embodiments, the valve core 20 includes a backflow surface 23, which is disposed opposite to the flow divider 21. The surface of the backflow surface 23 facing away from the flow divider 21 is an arc-shaped curved surface coaxial with the inner wall of the valve cavity, for contacting the inner wall of the valve cavity.

[0070] Understandably, the backflow surface 23 faces the back side of the valve cavity, that is, the direction opposite to or away from the inflow channel 11. The surface of the backflow surface 23 away from the diversion part 21 is processed into an arc-shaped surface. This arc-shaped surface has the same radius of curvature and axis as the inner wall of the valve cavity, that is, it is coaxial with the cylindrical valve cavity.

[0071] The arc-shaped surface of the backflow surface 23 forms a close contact with the inner wall of the valve cavity. The close contact can be a precise clearance fit or a slight interference fit. When the valve core 20 is assembled in the valve cavity, a large arc-shaped contact area is formed between the backflow surface 23 and the inner wall of the valve cavity.

[0072] When the flow divider 21 is subjected to the impact of the medium, the back flow surface 23 and the inner wall of the valve cavity form a stable radial support point. Together with the two end assembly parts 22, they form a continuous support structure, which enables the valve core 20 to maintain a stable axis of rotation under high pressure and high flow rate conditions, avoiding rotation jamming or sealing failure caused by force sway.

[0073] In some embodiments, the valve body 10 includes: a housing 14, a valve cavity formed inside the housing 14, and an inflow channel 11, a first outflow channel 12, and a second outflow channel 13 all passing through the housing 14 and communicating with the valve cavity; The first end cap 15 is disposed at one end of the housing 14 along the axial direction of the valve cavity; The second end cap 16 is disposed at the other end of the housing 14 along the axial direction of the valve cavity. Both the first end cap 15 and the second end cap 16 are sealed to the housing 14. The valve core 20 is disposed inside the housing 14, and along the axial direction of the valve cavity, the two ends of the valve core 20 are respectively provided with a first rotating end 24 and a second rotating end 25; The first rotating end 24 and the second rotating end 25 are respectively disposed at the assembly parts 22 at both ends of the diversion part 21, and the first rotating end 24 and the second rotating end 25 extend in opposite directions. The first rotating end 24 extends through the first end cover 15 to the outside of the valve body 10 for connection with the drive device 50; The second rotating end 25 is located on the second end cap 16 and is rotatably connected to the valve body 10.

[0074] Understandably, the housing 14, as the main body of the valve body 10, forms a cylindrical valve cavity inside, the valve core 20 is assembled in the valve cavity, and the assembly part 22 is in close contact with the inner wall of the housing 14. The first end cap 15 and the second end cap 16 are respectively disposed at both ends of the housing 14 along the valve cavity axis and are fixedly connected to the housing 14 by bolts, threads or clamps, etc., and static sealing is achieved by using sealing elements 26 (such as O-rings or metal gaskets). An annular groove is provided at the end of the first end rod and the second end cap 16 facing the valve cavity for assembling the annular sealing element 26. The first rotating end 24 and the second rotating end 25 respectively pass through the annular sealing element 26 to seal the gap between the first rotating end 24 and the second rotating end 25 and the first end cap 15 and the second end cap 16. The first end cap 15 and the second end cap 16 can not only seal the two ends of the valve cavity to form a complete inner cavity, but also provide support and positioning for the first rotating end 24 and the second rotating end 25 of the valve core 20.

[0075] Furthermore, the first rotating end 24 and the second rotating end 25 are disposed on the assembly portions 22 at both ends of the diversion portion 21 and extend axially away from the diversion portion 21.

[0076] Both the first end cap 15 and the second end cap 16 are fitted with wear-resistant bushings 27. The wear-resistant bushings 27 are fixed in the mounting holes opened in the first end cap 15 and the second end cap 16 by interference fit, serving as wear-resistant and friction-reducing rotating support surfaces. The wear-resistant bushings 27 can be made of tin bronze, aluminum bronze or oil-containing self-lubricating copper alloy, and have good wear resistance.

[0077] The first rotating end 24 extends through the first end cap 15, which is fitted with a wear-resistant bushing 27, and extends to the outside of the valve body 10. A precise sliding fit clearance is formed between the wear-resistant bushing 27 and the first rotating end 24, which not only ensures the free rotation of the valve core 20, but also plays a role in radial support and sealing. The extended part of the first rotating end 24 is used to connect with the drive device 50 (handwheel, electric actuator, pneumatic actuator, etc.) to transmit rotational power.

[0078] The second rotating end 25 passes through the wear-resistant bushing 27 in the second end cover 16 and forms a sliding fit with the wear-resistant bushing 27 embedded in the mounting hole of the second end cover 16, but does not penetrate the end cover.

[0079] Annular grooves are formed on the end faces of the first end cover 15 and the second end cover 16 facing the valve cavity. Annular seals 26 are embedded in the annular grooves to achieve static sealing between the first end cover 15 and the second end cover 16 and the two ends of the housing 14. Mounting holes are provided on the side of the annular groove away from the valve cavity, and the axial direction of the mounting holes is consistent with the axial direction of the valve cavity. Wear-resistant bushings 27 are embedded in the mounting holes so that the first rotating end 24 and the second rotating end 25 of the valve core 20 form a friction pair with the wear-resistant bushings 27, which can reduce the frictional resistance when the valve core 20 rotates, so that the valve core 20 can rotate smoothly under the driving action of the driving device 50.

[0080] The drive unit 50 can be a pneumatic actuator, using compressed air as a power source. The pneumatic actuator responds quickly, typically requiring only a fraction of a second to a few seconds from receiving the control signal to the valve core 20 completing its action, meeting the requirements for rapid sampling and achieving high-precision proportional control of the sampling flow rate.

[0081] The rotational connection between the output end (rotary shaft or coupling) of the pneumatic actuator and the first rotating end 24 of the valve core 20 can be a key connection, spline connection, etc.

[0082] After the pneumatic actuator is connected to the industrial control system (PLC, DCS), the operator can remotely control the rotation angle of the valve core 20 from the control room to achieve precise control of the sampling flow. For process steps that require timed and quantitative sampling, a fully automated sampling process can be implemented through programming, eliminating the need for manual on-site operation.

[0083] In some embodiments, the driving device includes: The output end is connected to the valve core drive to drive the valve core to rotate within the valve body; A limiting component is movably connected to the output end to adjust the rotation angle of the output end.

[0084] Understandably, the driving device can be a pneumatic actuator, and its output end can be a rotating shaft. The rotating shaft is connected to the first rotating end 24 of the valve core 20. Limit adjustment bolts 51 are respectively set at both ends of the pneumatic actuator. The limit adjustment bolts 51 act as limiting elements and can move relative to the pneumatic actuator. The limit adjustment bolts 51 at both ends of the pneumatic actuator correspond to the forward and reverse rotation limits of the output end, respectively. The length of the limit adjustment bolts 51 screwed into the pneumatic actuator directly determines the position of the mechanical stop. When the output end (i.e., the rotating shaft) drives the valve core 20 to rotate to a set angle, the limit stop inside the pneumatic actuator will press against the end face of the limit adjustment bolts 51, restricting the output end from continuing to rotate, thereby precisely limiting the maximum rotation angle of the output end.

[0085] Since the output end of the pneumatic actuator is connected to the first rotating end 24 of the valve core 20, the rotation angle of the pneumatic actuator is also the rotation angle of the valve core 20, so that the flow cross-sectional area of ​​the first opening and the second opening changes, and the flow cross-sectional area of ​​the first outflow channel 12 (sampling channel) and the second outflow channel 13 (emission channel) are proportionally allocated accordingly.

[0086] By turning the limiting adjustment bolt 51, the rotation range of the valve core 20 is limited, thereby adjusting the upper and lower limits of the ratio of the opening areas of the first outflow channel 12 and the second outflow channel 13.

[0087] For example, when the forward limit adjusting bolt 51 is adjusted to the position of the valve core 20 at its maximum opening of 45°, the rotation of the valve core 20 connects the first outflow channel 12 with the inflow channel 11. When the reverse limit adjusting bolt 51 is adjusted to the position of 0°, the rotation of the valve core 20 causes the diversion part 21 to rotate toward the first outflow channel 12 and completely closes the first inflow channel 11 (sampling channel), ensuring no leakage after sampling. At this time, the arc-shaped flow-facing surface 212 of the diversion part 21 is in close contact with the inner wall of the valve cavity, achieving a seal, and the medium is completely introduced into the second outflow channel 13 through the guide surface 211 of the valve core 20 toward the second outflow channel 13.

[0088] It should be noted that pneumatic actuators are existing technology well known to those skilled in the art, and their mechanisms will not be elaborated upon further.

[0089] In some embodiments, a support sleeve 60 is further included, which is sleeved on the output end and the first transmission end of the drive device 50, and one end of the support sleeve 60 is connected to the drive device 50 and the other end is connected to the valve body 10.

[0090] Understandably, the support sleeve 60 is a hollow cylindrical component with an inner diameter larger than the outer diameter of the output end of the drive device 50 and the first rotating end 24 of the valve core 20, forming a space to accommodate the connection structure of the two.

[0091] The two ends of the support sleeve 60 are fixedly connected to the housing or mounting flange of the drive device 50, and the other end is fixedly connected to the valve body 10 (which can be the first end cover 15 or the mounting seat of the housing 14). The connection method can be flange bolt connection.

[0092] The output end of the drive device 50 and the first rotating end 24 of the valve core 20 are connected in a transmission manner inside the support sleeve 60. The support sleeve 60 can protect the transmission connection components from the influence of the external environment and provide structural support for the entire transmission system.

[0093] Secondly, this application proposes a sampling system, including the diversion sampling device proposed in the first aspect; The sampling tube is connected at one end to the slurry pipeline and at the other end to the diversion sampling device. A sampling container is provided corresponding to the first outflow channel 12 and is used to collect slurry.

[0094] Understandably, the sampling system integrates the first-party diversion sampling device, along with sampling tubes and sampling containers.

[0095] One end of the sampling tube is connected to the slurry pipeline (main pipeline), and the other end is connected to the inflow channel 11 of the diversion sampling device.

[0096] The sampling container is correspondingly arranged with the first outflow channel 12 (sampling channel) of the diversion sampling device for collecting the sampling medium. The sampling container can be an open sampling bottle or a closed sampling bottle. The sampling container and the first outflow channel 12 can be connected by a flexible tube or a rigid tube to facilitate the placement and replacement of the sampling container.

[0097] In some embodiments, the sampling tube includes: a regulating valve disposed on the sampling tube; and a liquid level sensor disposed on the sampling container. The control unit is electrically connected to the level sensor, the drive device 50, and the regulating valve. The control unit is used to control the drive device 50 and the regulating valve to operate according to the level signal from the level sensor.

[0098] Understandably, the regulating valve, installed on the sampling pipe and located between the slurry pipeline and the diversion sampling device, can be an electric or pneumatic ball valve, butterfly valve, or needle valve. The opening of the regulating valve can be adjusted by the control unit, allowing for adjustment of the total sampling flow rate as needed during the sampling process, forming a two-stage control system with the internal proportional adjustment of the diversion sampling device.

[0099] A liquid level sensor is installed on the sampling container to detect the liquid level of the sample in the container in real time. The output signal of the liquid level sensor reflects the change in liquid level in the sampling container in real time and is transmitted to the control unit.

[0100] The control unit (such as a PLC, single-chip microcomputer, or industrial controller) is electrically connected to the liquid level sensor, the drive device 50 (pneumatic actuator or electric actuator), and the regulating valve, respectively. The control unit receives the signal from the liquid level sensor and automatically outputs commands according to the preset control logic (such as upper limit of liquid level, sampling time, sampling amount, etc.) to control the drive device 50 to adjust the rotation angle of the valve core 20, and at the same time control the opening of the regulating valve, so as to realize the automated closed-loop control of the sampling process.

[0101] It can keep the regulating valve in a constantly open state, and the sampling tube always has a medium flowing (even if the sampling channel is closed, the medium still flows back through the discharge channel of the diversion sampling device). The tube is kept in a flowing state, and solid particles cannot be deposited, which can significantly reduce the probability of sampling tube blockage.

[0102] Since the sampling tube is always in a conductive state, there is no need to wait for the regulating valve to open during sampling; the medium has already filled the sampling tube and the inlet of the diversion sampling device. When the valve core 20 rotates to open the sampling channel, the medium immediately enters the sampling container. It should be noted that the first outflow channel 12 can be a sampling channel, and the second outflow channel 13 can be a discharge channel.

[0103] The sampling process is as follows: Before sampling, valve core 20 is in the initial position, the sampling channel is completely closed, the medium flows back through the discharge channel, and the branch pipeline maintains a continuous flow state to prevent sedimentation and blockage.

[0104] At the start of sampling, the control unit issues a command, and the drive device 50 rotates the valve core 20, gradually opening the sampling channel. As the rotation angle of the valve core 20 increases, the opening areas of the sampling channel and the discharge channel change proportionally. The medium is actively divided by the flow divider 21 of the valve core 20 and enters the sampling container and the discharge channel respectively according to a set ratio. During sampling, a liquid level sensor inside the sampling container monitors the liquid level in real time. The control unit dynamically adjusts the valve core opening based on the liquid level signal to control the sampling flow rate, ensuring accurate sampling and preventing overflow. For quantitative sampling, the system automatically enters the stop phase when the liquid level reaches the preset value. When sampling stops, the control unit instructs the drive device 50 to reset the valve core 20 to its initial position, completely closing the sampling channel and isolating the sampling container from the system. The medium is then completely returned through the discharge channel, and the system returns to standby mode, awaiting the next sampling command.

[0105] The regulating valve is installed on the sampling pipe and kept partially open. Its opening degree is set according to the main pipeline pressure and the allowable inlet pressure of the diversion sampling device. After the high-pressure medium enters the sampling pipe from the slurry pipeline, its flow velocity increases as it flows through the throttling orifice of the regulating valve, partially converting pressure energy into kinetic energy, resulting in a significant pressure reduction. The smaller the opening degree of the regulating valve, the stronger the throttling effect and the more obvious the pressure reduction effect. By reasonably setting the opening degree of the regulating valve, the inlet pressure of the diversion sampling device can be reduced from the high pressure of the main pipeline to a relatively low and stable level.

[0106] During sampling, the valve core 20 of the diversion sampling device is partially open, with the sampling channel and discharge channel simultaneously connected, forming a diversion flow path. When the medium enters the sampling channel from the diversion section 21 of the valve core 20, it must pass through the throttling gap between the valve core 20 and the valve seat, resulting in a second throttling and pressure reduction. The smaller the opening degree of the valve core 20, the smaller the opening area of ​​the sampling channel, the stronger the throttling effect, and the lower the pressure of the medium entering the sampling container. By precisely controlling the opening degree of the valve core 20, the sampling pressure can be further reduced to atmospheric pressure or close to atmospheric pressure, allowing the medium to enter the sampling container at a stable flow rate and avoiding high-pressure jetting or splashing.

[0107] The regulating valve bears the main pressure drop, reducing the high pressure in the main pipeline to a medium-to-low pressure range that the shunt sampling device can withstand. This reduces the differential pressure load on the sealing surface of valve core 20 and extends its service life. Valve core 20 bears the remaining pressure drop, enabling fine regulation from the device inlet pressure to atmospheric pressure during sampling. Both valves have clearly defined functions, each operating within a reasonable differential pressure range, avoiding wear, cavitation, or control instability caused by excessive differential pressure on a single valve.

[0108] The control unit dynamically adjusts the opening of the regulating valve based on pressure sensor signals to maintain a stable inlet pressure for the diversion sampling device. The valve core 20 opening is synchronously adjusted in real time according to the sampling flow rate requirements. These two stages of adjustment work together to ensure consistently stable sampling pressure. This dynamic matching capability provides excellent adaptability to fluctuations in operating conditions, such as slurry pump start-up and shutdown, and changes in pipeline resistance.

[0109] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0110] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0111] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0112] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A diversion sampling device, characterized in that, include: The valve body has a valve cavity inside, and the valve body is respectively provided with an inflow channel, a first outflow channel and a second outflow channel communicating with the valve cavity; A valve core is movably disposed within the valve cavity. The valve core includes a flow divider portion, which is disposed toward the inflow channel to divide the port where the inflow channel connects to the valve cavity into a first port near the first outflow channel and a second port near the second outflow channel. A driving device is connected to the valve core and drives the valve core to move relative to the valve body, so as to simultaneously adjust the flow cross-sectional area of ​​the first port and the flow cross-sectional area of ​​the second port.

2. The diversion sampling device according to claim 1, characterized in that, The valve core is rotatable, and the driving device drives the valve core to rotate.

3. The diversion sampling device according to claim 1, characterized in that, include: The valve cavity is cylindrical, and the inflow channel, the first outflow channel, and the second outflow channel all extend radially along the valve cavity. The valve core rotates about the axis of the valve cavity. The diversion section has two guide surfaces that correspond to the first outflow channel and the second outflow channel, respectively.

4. The diversion sampling device according to claim 3, characterized in that, The two guide surfaces are set at an angle, and along the axial direction of the valve cavity, the cross-sectional width of the diversion section increases from the end closer to the inflow channel to the end farther away from the inflow channel.

5. The diversion sampling device according to claim 3, characterized in that, The two guide surfaces are spaced apart at one end near the inflow channel, and a flow-facing surface is connected between the two guide surfaces at one end near the inflow channel. The flow-facing surface is an arc-shaped curved surface coaxial with the inner wall of the valve cavity.

6. The diversion sampling device according to claim 3, characterized in that, Along the axial direction of the valve cavity, the length of the diversion section is greater than the diameter of the port; and / or, The axial length of the valve cavity is greater than the diameter of the port, and the valve core also includes assembly parts distributed axially at both ends of the flow divider. The assembly part is cylindrical, and its axis is collinear with the axis of the valve cavity. The diameter of the assembly part is adapted to the inner diameter of the valve cavity so that the assembly part fits and contacts the inner wall of the valve cavity.

7. The diversion sampling device according to claim 3, characterized in that, The valve core includes: The backflow surface is disposed opposite to the flow divider. The surface of the backflow surface that is away from the flow divider is an arc-shaped curved surface coaxial with the inner wall of the valve cavity, which is used to fit and contact the inner wall of the valve cavity.

8. The diversion sampling device according to claim 3, characterized in that, Projected along the axial direction of the valve cavity, the axis of the inflow channel is perpendicular to the axis of the first outflow channel, and the axis of the first outflow channel is collinear with the axis of the second outflow channel.

9. A sampling system, characterized in that, include: The shunt sampling device as described in any one of claims 1-8; The sampling tube is connected at one end to the slurry pipeline and at the other end to the diversion sampling device; A sampling container is provided corresponding to the first outflow channel and is used to collect slurry.

10. The sampling system according to claim 9, characterized in that, include: A regulating valve is provided in the sampling tube; A liquid level sensor is installed in the sampling container; The control unit is electrically connected to the liquid level sensor, the drive device, and the regulating valve. The control unit is used to control the drive device and the regulating valve to operate according to the liquid level signal from the liquid level sensor.

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