Reflux device for centrifugal extractor

Abstract

The present invention relates to a reflux device for a centrifugal extractor. The reflux device for a centrifugal extractor comprises: a valve core, which is assembled on the reflux device along a vertical axis and is provided with an overflow channel therein; a rotation drive structure for driving the valve core to rotate; a valve core sleeve, which is sleeved on the outside of the valve core and forms an annular material cavity with the valve core; a reflux device feed port, which is connected to the annular material cavity; an overflow hole is provided on the outer peripheral surface of the valve core, and the overflow hole is connected to the overflow channel; a flow distribution seat, which is provided with an overflow discharge channel and a reflux channel, and the overflow discharge channel and the reflux channel are independent of each other; the lower end of the valve core sleeve is sealed and connected to the flow distribution seat, and the inlet end of the reflux channel is connected to the annular material cavity; a blocking block is provided at the bottom of the valve core; the lower end of the valve core is sealed and matched with the flow distribution seat, and the bottom end opening of the overflow channel remains connected to the overflow discharge channel. The above scheme can conveniently realize the reflux of a small flow system.

Description

Technical Field

[0001] The present invention relates to a reflux device for a centrifugal extractor. Background Art

[0002] Centrifugal extraction is a new, highly efficient separation technology that leverages centrifugal force to achieve rapid liquid-liquid contact, mass transfer, and separation. Compared to other extraction technologies, it offers advantages such as a smaller footprint, higher efficiency, reduced extraction agent usage, improved sealing, a high degree of automation, and the ability to facilitate clean production. It has been widely used in a variety of fields, including hydrometallurgy, wastewater treatment, pharmaceuticals, chemicals, and food.

[0003] Most centrifugal extractors currently on the market have limitations for feed-liquid systems, operating within a light-to-heavy phase volume ratio (also known as the flow ratio range) of 1:30 to 30:1. Within this flow ratio range, centrifugal extractors can achieve high-quality products and extraction efficiency by adjusting the rotational speed, heavy-phase weir, or increasing the number of extraction stages. However, many industrial extraction processes require light-to-heavy phase volume ratios far exceeding this range. For example, in the rare earth extraction industry and wastewater treatment, particularly oil removal from water, the light-to-heavy phase ratio can reach as high as 1:1000. Furthermore, most extraction industries require high purity of the heavy and light phases, often requiring the removal of a small amount of the heavy phase from the organic phase during the stripping process, commonly known as "removing water from the oil." Existing centrifugal extractors, when operating in such systems, suffer from poor contact and equilibrium between the two phases during the liquid-liquid extraction process, resulting in low product concentration, purity, and extraction efficiency. This significantly hinders their application in these applications.

[0004] If the flow ratio of the two phases within a centrifugal extractor could be adjusted significantly, the centrifugal extractor's adaptability could be expanded. To address this issue, a current solution involves using a tee pipe for reflux, returning the low-flow phase (i.e., the smaller flow rate of the light and heavy feeds) to the centrifugal extractor. However, this solution makes it difficult to determine the reflux volume, which affects the flow ratio. Another solution involves using a storage container, pump, and flowmeter for reflux, but this is costly and requires significant floor space. There is also a solution, such as the patent document with publication number CN104771932B, which discloses an external reflux device for a centrifugal extractor. The reflux device includes a closed solution collection chamber, a feed pipe connected to the small flow phase outlet of the centrifugal extractor, a reflux pipe connected to the small flow phase inlet of the centrifugal extractor, and a small flow phase outlet device. For different feed and liquid systems and their required reflux rates, professional technicians are required to perform complex calculations based on the feed and liquid parameters and the shape and size of the solution collection chamber. According to the calculated height, the operator is required to open the closed solution collection chamber and adjust the inlet height position of the small flow phase outlet device with tools such as wrenches to control the reflux rate. The operation is cumbersome and complicated, the working environment is harsh, and there is a risk of contaminating the feed and liquid during the operation. At the same time, due to the existence of the reflux solution collection chamber, the liquid storage volume is large. Summary of the Invention

[0005] The object of the present invention is to provide a reflux device for a centrifugal extractor, which can conveniently realize the reflux of a small flow phase.

[0006] The present invention adopts the following technical solutions:

[0007] The reflux device of the centrifugal extractor comprises:

[0008] The valve core is assembled on the return flow device in a rotational manner along the vertical axis and has an overflow channel therein;

[0009] A rotation drive structure, used for driving the valve core to rotate;

[0010] The valve core sleeve is sleeved on the outside of the valve core and forms an annular material cavity with the valve core;

[0011] The reflux feed port is connected to the annular material chamber and is used to connect to the small flow phase outlet of the centrifugal extractor;

[0012] An overflow hole is provided on the outer peripheral surface of the valve core, which is connected to the overflow channel, so that the liquid in the annular cavity rises to the height of the overflow hole and flows into the overflow channel;

[0013] The reflux device also includes a flow distribution seat, on which an overflow discharge channel and a reflux channel are provided, and the overflow discharge channel and the reflux channel are independent of each other;

[0014] The lower end of the valve core sleeve is sealed and connected to the flow distribution seat, and the inlet end of the reflux channel is connected to the annular material cavity;

[0015] A blocking block is provided at the bottom of the valve core, which is used to adjust the opening size of the inlet end of the reflux channel when the valve core rotates;

[0016] The lower end of the valve core is sealed with the flow distribution seat, and the bottom opening of the overflow channel is connected with the overflow discharge channel to discharge part of the small flow phase liquid from the centrifugal extractor of this stage.

[0017] Beneficial effect: With the above technical solution, the sealing block at the bottom of the valve core can form a valve structure with the inlet end of the reflux channel, and the opening size of the inlet end of the reflux channel can be adjusted when the valve core rotates, thereby changing the reflux amount; at the same time, through the overflow hole and overflow channel on the valve core, a part of the overflow discharge of the small flow phase system can be realized, thereby realizing the reflux adjustment function through the independent overflow discharge channel and reflux channel. Compared with the existing technology, it avoids the need to disassemble the existing reflux device, and the cumbersome operation and harsh working environment caused by adjusting the insertion height of the small phase system reflux pipe in the solution collection chamber by a wrench, etc., and it is also easy to cause the problem of liquid contamination. It is easy to use.

[0018] As a preferred technical solution: the valve core is provided with a downward annular step surface, the reflux feed port is arranged above the annular step surface, and the overflow hole is located below the annular step surface. The annular step surface is used to prevent the liquid flowing into the annular material cavity from the reflux feed port from flowing into the overflow hole from above.

[0019] Beneficial Effects: By adopting the above technical solution, the annular step surface can guide the liquid flowing downward from above, preventing the liquid from flowing directly into the overflow hole from above, thereby better ensuring the accuracy of the reflux amount. Of course, in other embodiments, the feed from the reflux device feed port can also flow downward along the inner wall of the valve core sleeve, which can also prevent the liquid from flowing into the overflow hole from above.

[0020] As a preferred technical solution: the valve core has a thickened section, and the annular step surface is formed by the annular bottom end surface of the thickened section; a groove is provided on the annular bottom end surface of the thickened section, and the groove wall on the side close to the outer peripheral surface of the thickened section is an inclined groove wall, which is used to prevent the liquid from flowing toward the overflow hole.

[0021] Beneficial effects: The above technical solution can conveniently realize the drainage of the liquid flow facing the annular step, with a simple structure and easy processing.

[0022] As a preferred technical solution: there is a height difference between the inclined trough wall and the overflow hole, and the height difference is used to apply pressure to the feed liquid on the inclined trough wall to assist it to enter the overflow hole.

[0023] Beneficial Effect: The above technical solution facilitates the smooth flow of liquid from the overflow hole into the overflow channel on the valve core. Before overflow occurs, the thickened section can still prevent the liquid from flowing directly into the overflow hole. After overflow occurs, the liquid can submerge the lower end surface of the thickened section without affecting the normal operation of the reflux device.

[0024] As a preferred technical solution: a rotary seat is fixed to the upper end of the valve core sleeve, and the valve core is rotatably assembled on the rotary seat.

[0025] Beneficial effect: The above technical solution facilitates the installation and maintenance of the valve core.

[0026] As a preferred technical solution: a feed hole is provided on the rotary seat, the valve core passes through the feed hole, and a feed cavity is formed between the outer peripheral surface of the valve core and the hole wall of the corresponding part of the feed hole;

[0027] The feed cavity is communicated with the annular cavity, and the feed port of the reflux device is arranged on the side wall of the feed cavity.

[0028] Beneficial effect: The above technical solution facilitates the setting of the reflux feed port.

[0029] As a preferred technical solution: an adjusting knob is provided on the rotary seat, and the adjusting knob is connected to the valve core to form the rotation drive structure;

[0030] The swivel seat is also provided with an indicating scale, which corresponds to the adjusting knob and is used to indicate the rotation position of the valve core.

[0031] Beneficial effect: The above technical solution can intuitively and conveniently adjust the reflux volume.

[0032] As a preferred technical solution: the inlet end of the reflux channel is an arc-shaped long hole, and the blocking block is a fan-shaped block, which is used to achieve linear adjustment.

[0033] Beneficial effect: The adoption of the above technical solution is conducive to making the reflux flow rate regulation satisfy a linear relationship, which is convenient for the calibration of the indicating scale.

[0034] As a preferred technical solution: the flow distribution seat is also provided with a small phase system external feed port and a small phase system total feed port; the small phase system external feed port is used to replenish the small flow phase system liquid supplied from the outside of the reflux device to the reflux channel, and the small phase system total feed port is used to communicate with the small flow phase system inlet of the centrifugal extractor.

[0035] Beneficial effects: The above technical solution can avoid the need to set up a three-way structure on the centrifugal extractor, without changing the original structure of the centrifugal extractor, and is easy to use and compact in structure.

[0036] As a preferred technical solution: the inlet ends of the overflow discharge channel and the reflux channel are both arranged on the top surface of the flow distribution seat, the lower end surface of the valve core is sealed against the top surface of the flow distribution seat, and the overflow channel passes downward through the lower end surface of the valve core and docks with the inlet of the overflow discharge channel.

[0037] Beneficial effect: The above technical solution is adopted to facilitate the assembly and processing of the valve core.

[0038] As a preferred technical solution: the reflux channel on the flow distribution seat is a U-shaped structure, and the bottom of the U-shaped structure forms a liquid accumulation groove, which is used to collect liquid when the reflux device is working to keep the inlet end of the reflux channel in a liquid-infiltrated state.

[0039] Beneficial effect: By adopting the above technical solution, the inlet end of the reflux channel can maintain a liquid-infiltrated state when the reflux device is working, thereby eliminating the problem that the liquid cannot enter the tiny reflux channel due to the existence of surface tension when the reflux volume is small, eliminating the instability of liquid reflux, and better meeting the demand for small reflux volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a perspective view of Example 1 of a reflux device of a centrifugal extractor of the present invention;

[0041] Figure 2 yes Figure 1 Main view in section state;

[0042] Figure 3 yes Figure 2 A three-dimensional view of the middle valve core;

[0043] Figure 4 yes Figure 1 A three-dimensional view of the middle and bottom seat;

[0044] Figure 5 yes Figure 4 Right side view of the middle bottom seat;

[0045] Figure 6 It is a cross-sectional view of Example 2 of the reflux device of the centrifugal extractor in the invention.

[0046] The names of the components corresponding to the corresponding reference numerals in the figure are: 11. flow distribution seat; 12. sleeve connection port; 13. overflow discharge port; 14. valve port; 15. total feed port of small phase system; 16. external feed port of small phase system; 17. overflow discharge channel; 18. reflux channel; 19. liquid accumulation tank; 110. exhaust hole; 21. valve core; 22. overflow hole; 23. overflow channel; 24. small diameter section; 25. thickened section; 26. groove; 27. blocking block; 28. annular material cavity; 31. valve core sleeve; 41. swivel seat; 42. feed hole; 43. feed cavity; 44. reflux device dial; 45. reflux device formula dial; 46. reflux device feed port; 51. set screw; 52. adjusting knob; 53. connecting stud. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0049] It should be noted that the relational terms such as "first" and "second" that may appear in the specific embodiments of the present invention are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or device. In the absence of further restrictions, the phrase "includes a..." that defines an element does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0050] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] In the description of the present invention, unless otherwise expressly specified or limited, the terms "provided with" and "provided with" should be understood broadly. For example, the object "provided with" may be a part of the main body, or may be arranged separately from the main body and connected to the main body. The connection may be detachable or non-detachable. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0052] The present invention is described in further detail below with reference to the examples.

[0053] Example 1 of the reflux device of the centrifugal extractor of the present invention:

[0054] like Figure 1 and Figure 2 As shown, the reflux device of the centrifugal extractor comprises, from bottom to top, a flow distribution seat 11, a valve core 21 and a valve core sleeve 31, a rotary seat 41, and an adjusting knob 52. The valve core sleeve 31 is fixedly connected between the flow distribution seat 11 and the rotary seat 41. The valve core 21 is rotatably assembled on the rotary seat 41 and coaxially inserted into the valve core sleeve 31. The adjusting knob 52 forms a rotation drive structure for driving the valve core 21 to rotate.

[0055] Specifically, the flow distribution seat 11 is a four-way valve seat, which is a rectangular parallelepiped as a whole, and is provided with an overflow discharge channel 17 and a return channel 18 inside. The overflow discharge channel 17 and the return channel 18 are both L-shaped structures, and are independently provided and isolated from each other. Figure 4 The inlet ends of the overflow discharge channel 17 and the reflux channel 18 are both arranged on the top surface of the flow distribution seat 11.

[0056] like Figure 2 、 Figure 4 and Figure 5A sleeve connection port 12 is provided on the top surface of one end of the flow distribution seat 11 in the longitudinal direction, and an overflow discharge port 13 is provided on the side. The sleeve connection port 12 is a plug-in hole for the valve core sleeve 31 to be plugged in, fixed and sealed; the valve core sleeve 31 can be connected to the flow distribution seat 11 in any possible way, such as threaded connection, clamping, bonding, welding, etc., and a sealing ring can be provided to ensure the sealing effect. The inlet ends of the overflow discharge channel 17 and the reflux channel 18 are both provided on the bottom wall of the plug-in hole. The inlet end of the reflux channel 18 forms a valve port 14, which is an arc-shaped long hole, which can make the reflux volume adjustment meet the linear relationship; the inlet end of the reflux channel 18 is provided at the axis of the sleeve connection port 12, which is a circular hole. The overflow discharge port 13 is connected to the outlet end of the overflow discharge channel 17 for a part of the small flow phase to be discharged from the centrifugal extractor of this stage.

[0057] A small phase system total feed port 15 is provided on the end surface of the other end in the longitudinal direction of the flow distribution seat 11, and a small phase system external feed port 16 is provided on the side. The small phase system total feed port 15 is used to communicate with the small flow phase system inlet of the centrifugal extractor, and the small phase system external feed port 16 is used to replenish the external small flow phase liquid to the reflux channel 18. Figure 2 The small phase system total feed port 15, the small phase system external feed port 16 and the outlet end of the reflux channel 18 form a three-way structure.

[0058] like Figure 2 The valve core 21 and the valve core sleeve 31 are both rotating body structures. The valve core sleeve 31 is coaxially sleeved outside the valve core 21 and forms an annular material cavity 28 with the valve core 21. Figure 2 and Figure 3The outer circumferential surface of the valve core 21 is provided with overflow holes 22. The overflow holes 22 are evenly distributed along the circumference in a cross-shaped structure. They are connected to an overflow channel 23 that is provided vertically and through the axis of the valve core 21. When the liquid in the annular cavity 28 rises to the height of the overflow holes 22, it flows into the overflow channel 23. In this embodiment, the overflow holes 22 are circular holes. In other embodiments, the overflow holes 22 can also be other shapes, such as square, oval, etc., as long as the overflow channel 23 can be connected to the annular cavity 28. The lower end face of the valve core 21 is sealed against the top surface of the flow distribution seat 11. The overflow channel 23 extends downward through the lower end face of the valve core 21 and connects to the inlet of the overflow discharge channel 17. A downward-facing annular step surface is provided in the axial middle portion of the valve core 21 above the overflow hole 22. The annular step surface is formed by the annular bottom end surface of the thickened section 25. A groove 26 is provided on the annular step surface. The side wall of the groove 26 close to the axis of the valve core 21 is a vertical groove wall, and the groove wall close to the outer peripheral surface of the thickened section 25 is an inclined groove wall, forming an eaves structure that can guide the liquid flow to fall from the area close to the outer peripheral surface of the thickened section 25, thereby preventing the liquid flowing into the annular cavity 28 from flowing into the overflow hole 22 from above. There is a height difference between the annular bottom end surface of the thickened section 25 and the overflow hole 22. After the liquid submerges the lower end surface of the thickened section, this height difference is used to cause the inclined groove wall to apply pressure to the liquid, assisting it in entering the overflow hole 22, which is more suitable for situations with large liquid flow rates. A sealing block 27 is provided at the bottom of the valve core 21. This fan-shaped block protrudes from the outer circumference of the bottom end of the valve core 21 and is used to linearly change the degree of sealing of the inlet end of the reflux channel 18 as the valve core 21 rotates, thereby linearly adjusting the opening size of the inlet end of the reflux channel 18. A small-diameter section 24 is provided at the lower end of the valve core 21. The annular cavity 28 corresponding to the small-diameter section 24 has a larger radial dimension than the adjacent section.

[0059] like Figure 2 The rotary seat 41 is provided with a feed hole 42. The upper end of the valve core 21 passes through the feed hole 42 and rotates with the small diameter portion at the top of the feed hole 42. The inner wall of the middle and lower sections of the feed hole 42 and the outer peripheral surface of the valve core 21 form a feed cavity 43. The feed cavity 43 is connected to the annular cavity 28. The side wall of the feed cavity 43 is provided with a reflux feed port 46. The reflux feed port 46 is connected to the annular cavity 28 and is used to connect to the small flow phase outlet of the centrifugal extractor. Figure 1 and Figure 2The top of the valve core 21 is fixedly connected to the adjusting knob 52 via a set screw 51, and the adjusting knob 52 has a dial scale pointer. A return flow meter dial 44 is also fixed to the top surface of the swivel seat 41 via screws. The return flow meter dial 44 has an indicator scale that corresponds to the adjusting knob 52 and is used to indicate the rotational position of the valve core 21. The indicator scale and the opening of the inlet end of the return flow channel 18 are simulated and calibrated using CFD (computational fluid dynamics) methods and verified by experiments. This method is more suitable for complex flow channels and has higher accuracy than traditional calculation formulas. The set screw 51 forms a positioning device that can determine the relative position of the dial scale pointer, the return flow meter dial 44, the valve core 21, and the inlet end of the return flow channel 18 in the flow distribution seat 11. The portion of the upper end of the valve core 21 that passes through the rotary seat 41 has a smaller diameter, and an upward annular step is formed on the valve core 21. A pressure plate is provided on the rotary seat 41, and the pressure plate presses on the annular step to make the valve core 21 fit tightly with the flow distribution seat 11, ensuring that the sealing block 27 seals the valve port 14 and the overflow channel 23 and the overflow discharge channel 17 are closed.

[0060] A reflux flow meter formula disk 45 is mounted on the side of the rotatable base 41. This disk displays universal reflux flow rate calculation formulas tailored to different feed and liquid parameters. To accommodate changes in the flow ratio of different feed and liquid systems, the required flow rate can be accurately calculated directly using the fitting formula on the reflux flow meter formula disk 45. This calculation can be performed manually or intelligently, eliminating the need for complex flow ratio conversion calculations based on the solution collection chamber dimensions and feed and liquid parameters required by existing technologies when switching between different feed and liquid systems. This calculation can be performed manually or integrated into an automated calculation system for intelligent calculation.

[0061] During use, the reflux feed port 46 on the swivel seat 41 is directly connected to the outlet of the small flow phase system of the centrifugal extractor, the small phase system external feed port 16 on the flow distribution seat 11 is connected to the external material supply device, and the small phase system total feed port 15 is directly connected to the small flow phase system feed port of the centrifugal extractor. There is no need to change the structure of the centrifugal extractor, nor is there a need to add a three-way pipe to the small flow phase system feed port of the centrifugal extractor. The pipe connection is simple and beautiful, and the integration with the centrifugal extractor is high. During use, the reflux volume can be accurately controlled by adjusting the knob 52 and the indicator scale. Compared with the prior art, there is no need to disassemble the solution collection chamber, and the operation is simple and easy to understand. This avoids the need for disassembly of the existing reflux device and the cumbersome operation caused by adjusting the insertion height of the small phase system reflux pipe in the solution collection chamber by a wrench, etc., and the poor working environment. It is also easy to cause the problem of liquid contamination. In addition, the reflux device in the present invention does not need to be provided with a large solution collection chamber. The valve core sleeve 31 is in the form of a pipe, which is overall small and beautiful, with a small liquid storage volume, high stability, and a simple structure.

[0062] Example 2 of the reflux device of the centrifugal extractor of the present invention:

[0063] One difference between this embodiment and embodiment 1 is that Figure 6 The reflux channel 18 in the flow distribution seat 11 is a U-shaped structure, and a liquid accumulation groove 19 is formed at the bottom of the U-shaped structure. The liquid accumulation groove 19 is used to collect liquid when the reflux device is working so that the inlet end of the reflux channel 18 remains in a liquid-soaked state. In order to facilitate the processing of the reflux channel 18, the flow distribution seat 11 adopts a left-right split structure. The two split parts are fixedly connected by screws passing through the left split part and are sealed by a sealing ring at the split interface. In this embodiment, the inlet end of the reflux channel 18 is at a height equivalent to the outlet end so that the inlet end of the reflux channel 18 remains in a liquid-soaked state. In other embodiments, the height of the outlet end of the reflux channel 18 can also be appropriately adjusted. However, preferably, the height of the outlet end is not lower than the height of the bottom opening of the vertical channel part corresponding to the inlet end in the reflux channel 18 so that the inlet end of the reflux channel 18 remains in a liquid-soaked state stably.

[0064] Another difference between this embodiment and Example 1 is that, to prevent pressure buildup due to temperature fluctuations within the chamber of flow distribution block 11 connected to the small-phase system main feed port 16, a vent is provided on the top surface of flow distribution block 11. In other embodiments, the vent may also be provided on the connecting pipe to the small-phase system main feed port 15, or on a vertical side surface of flow distribution block 11.

[0065] Another difference between this embodiment and embodiment 1 is that four connecting studs are provided between the swivel seat 41 and the flow distribution seat 11. The upper end of the connecting stud 53 passes through the swivel seat 41 upward, and the lower end passes through the flow distribution seat 11 downward, and is locked with a nut, so that the swivel seat 41, the valve core sleeve 31, and the flow distribution seat 11 are crimped and fixed together, with high connection strength and good structural stability.

[0066] Another difference between this embodiment and embodiment 1 is that in this embodiment, according to the overflow requirement, the distance between the thickened section 25 on the valve core 21 and the overflow hole 22 is larger. The thickened section is only used to prevent liquid from flowing directly into the overflow hole 22 from above, and is not used to assist liquid in entering the overflow hole 22.

[0067] Any of the above differences in the above embodiment 2 can be adopted separately in other embodiments.

[0068] Example 3 of the reflux device of the centrifugal extractor of the present invention:

[0069] This embodiment differs from Example 1 in that, whereas in Example 1, the rotational drive structure connected to the valve core 21 is an adjustment knob 52, in this embodiment, the rotational drive structure is an electric drive device that automatically drives the valve core 21 to rotate according to program settings. Of course, in other embodiments, the rotational drive structure may also be a torque transmission structure, such as a square head provided at the top of the valve core, which is temporarily assembled with an adjustment knob when adjusting the flow ratio.

[0070] Example 4 of the reflux device of the centrifugal extractor of the present invention:

[0071] The difference between this embodiment and embodiment 1 is that in embodiment 1, the reflow feed port 46 is arranged on the rotary seat 41 at the top of the valve core sleeve 31, while in this embodiment, the reflow feed port 46 is arranged on the side wall of the valve core sleeve 31.

[0072] Example 5 of the reflux device of the centrifugal extractor of the present invention:

[0073] The difference between this embodiment and embodiment 1 is that, in embodiment 1, the flow distribution seat 11 is provided with an overflow discharge channel 17 and a reflux channel 18, and is also provided with a small phase system external feed port 16 and a small phase system total feed port 15; while in this embodiment, the flow distribution seat 11 is only provided with an overflow discharge channel 17 and a reflux channel 18. When in use, a tee can be provided on the inlet of the small flow phase system of the centrifugal extractor, which is connected to the external feed device and the reflux channel 18 of the reflux device through the tee.

[0074] Example 6 of the reflux device of the centrifugal extractor of the present invention:

[0075] The difference between this embodiment and embodiment 1 is that in embodiment 1, the reflux feed port 46 is arranged above the overflow hole 22, while in this embodiment, the reflux feed port 46 is arranged below the overflow hole 22, and at this time, the valve core 21 is not provided with an annular step surface for preventing liquid from flowing into the overflow hole 22 from above.

[0076] Example 7 of the reflux device of the centrifugal extractor of the present invention:

[0077] The difference between this embodiment and embodiment 1 is that, in embodiment 1, the valve core 21 has a thickened section 25, and the annular step surface is formed by the annular bottom end surface of the thickened section 25, while in this embodiment, the diameter of the part of the valve core 21 located above the overflow hole 22 is larger than the diameter of the lower part, and the annular step is formed by the transition structure of the large and small diameter parts of the valve core 21.

[0078] Example 8 of the reflux device of the centrifugal extractor of the present invention:

[0079] This embodiment differs from Embodiment 1 in that, whereas in Embodiment 1, the reflux device includes a swivel seat 41 on which the valve core 21 rotates, in this embodiment, the valve core 21 rotates on the valve core sleeve 31. Of course, in other embodiments, the valve core 21 may also be assembled in other rotatable manners, such as being rotatably assembled on the flow distribution seat 11.

[0080] Example 9 of the reflux device of the centrifugal extractor of the present invention:

[0081] The difference between this embodiment and embodiment 1 is that, in embodiment 1, the lower end of the valve core 21 is sealed against the flow distribution seat 11, while in this embodiment, the lower end of the valve core 21 is provided with a plug-in section, which is sealably inserted into the inlet end of the return channel 18 on the flow distribution seat 11, and the sealing block 27 on the valve core 21 is arranged above the plug-in section.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A reflux device for a centrifugal extractor, characterized in that: include: A valve core (21) is rotatably mounted on the return flow device along a vertical axis and has an overflow channel (23) therein; A rotation drive structure for driving the valve core (21) to rotate; A valve core sleeve (31) is sleeved on the outside of the valve core (21) and forms an annular material cavity (28) with the valve core (21); A reflux feed port (46) is connected to the annular material chamber (28) and is used to connect to the small flow phase outlet of the centrifugal extractor; An overflow hole (22) is provided on the outer peripheral surface of the valve core (21), and the overflow hole (22) is communicated with the overflow channel (23) so that the liquid in the annular cavity (28) flows into the overflow channel (23) when it rises to the height of the overflow hole (22); The reflux device further comprises a flow distribution seat (11) on which an overflow discharge channel (17) and a reflux channel (18) are provided, wherein the overflow discharge channel (17) and the reflux channel (18) are independent of each other; The lower end of the valve core sleeve (31) is sealed and connected to the flow distribution seat (11), and the inlet end of the return channel (18) is connected to the annular material cavity (28); A blocking block (27) is provided at the bottom of the valve core (21), and the blocking block (27) is used to adjust the opening size of the inlet end of the reflux channel (18) when the valve core (21) rotates; The lower end of the valve core (21) is sealed with the flow distribution seat (11), and the bottom opening of the overflow channel (23) is connected with the overflow discharge channel (17) to discharge part of the small flow phase liquid from the centrifugal extractor of this stage.

2. The reflux device according to claim 1, characterized in that: The valve core (21) is provided with a downward annular step surface, the recirculator feed port (46) is arranged above the annular step surface, and the overflow hole (22) is located below the annular step surface. The annular step surface is used to prevent the liquid flowing into the annular material cavity (28) from the recirculator feed port (46) from flowing into the overflow hole (22) from above.

3. The reflux device according to claim 2, characterized in that: The valve core (21) has a thickened section (25), and the annular step surface is formed by the annular bottom end surface of the thickened section (25); a groove (26) is provided on the annular bottom end surface of the thickened section (25), and the groove wall of the groove (26) on the side close to the outer peripheral surface of the thickened section (25) is an inclined groove wall, which is used to prevent liquid from flowing toward the overflow hole (22).

4. The reflux device according to claim 3, characterized in that: There is a height difference between the annular bottom end surface of the thickened section (25) and the overflow hole (22), and this height difference is used to enable the inclined groove wall to apply pressure to the overflow liquid, thereby assisting it to enter the overflow hole (22).

5. The reflux device according to claim 1, 2, 3 or 4, characterized in that: A rotary seat (41) is fixed to the upper end of the valve core sleeve (31), and the valve core (21) is rotatably assembled on the rotary seat (41).

6. The reflux device according to claim 5, characterized in that: The rotary seat (41) is provided with a feed hole (42), the valve core (21) passes through the feed hole (42), and a feed cavity (43) is formed between the outer peripheral surface of the valve core (21) and the hole wall of the corresponding part of the feed hole (42); the feed cavity (43) is communicated with the annular cavity (28), and the reflux feed port (46) is provided on the side wall of the feed cavity (43).

7. The reflux device according to claim 5, characterized in that: The rotary seat (41) is provided with an adjusting knob (52), and the adjusting knob (52) is connected to the valve core (21) to form the rotation drive structure; The rotary seat (41) is also provided with an indicating scale, which corresponds to the adjusting knob (52) and is used to indicate the rotation position of the valve core (21).

8. The reflux device according to claim 1, 2, 3 or 4, characterized in that: The inlet end of the reflux channel (18) is an arc-shaped long hole, and the blocking block (27) is a fan-shaped block for achieving linear adjustment.

9. The reflux device according to claim 1, 2, 3 or 4, characterized in that: The flow distribution seat (11) is further provided with a small phase system external feed port (16) and a small phase system total feed port (15); the small phase system external feed port (16) is used to supplement the small flow phase system liquid supplied from the outside of the reflux device to the reflux channel (18), and the small phase system total feed port (15) is used to communicate with the small flow phase system inlet of the centrifugal extractor.

10. The reflux device according to claim 1, 2, 3 or 4, characterized in that: The inlet ends of the overflow discharge channel (17) and the return channel (18) are both arranged on the top surface of the flow distribution seat (11), the lower end surface of the valve core (21) is sealed against the top surface of the flow distribution seat (11), and the overflow channel (23) passes through the lower end surface of the valve core (21) downward and docks with the inlet of the overflow discharge channel (17).

11. The reflux device according to claim 1, 2, 3 or 4, characterized in that: The reflux channel (18) on the flow distribution seat (11) is a U-shaped structure, and a liquid accumulation groove (19) is formed at the bottom of the U-shaped structure. The liquid accumulation groove (19) is used to collect liquid when the reflux device is working so that the inlet end of the reflux channel (18) remains in a liquid-infiltrated state.

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