Choke

Abstract

The present invention discloses a flow restrictor, which includes a housing, a lining sleeve, a rotor and a driving assembly. A first groove is provided on the housing, and the lining sleeve is installed in the first groove. A second groove is provided on the lining sleeve, and the inner diameter of the second groove gradually increases along the direction from the groove bottom to the groove opening of the second groove in the axial direction of the second groove. A ball inlet channel and a ball outlet channel communicating with the second groove are provided on the housing and the lining sleeve. One end of the rotor is rotatably fitted in the second groove, a ball receiving groove is provided on the outer peripheral wall of the rotor, and the driving assembly is connected to the other end of the rotor. The flow restrictor according to the embodiment of the present invention realizes self-sealing through the cooperation of the rotor conical surface and the bushing conical surface, thereby enhancing the flow restricting effect of the flow restrictor. Moreover, the flow restricting effect of the flow restrictor will not weaken with the wear of the sealing surface, and there is no need to frequently replace and repair the flow restrictor, which has strong reliability and a long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of reactor engineering, and particularly relates to a flow restrictor. Background Art

[0002] The fuel handling system of a high-temperature gas-cooled reactor performs the function of refueling the reactor without shutting down the reactor, and is a key system to ensure the long-term safe and stable operation of the high-temperature gas-cooled reactor. It mainly performs functions such as loading new fuel into the reactor core, unloading spent fuel from the reactor core, and recycling fuel elements back to the reactor core.

[0003] The fuel handling system of the high-temperature gas-cooled reactor demonstration project adopts the principle of single-column and single-direction ordered transportation in design, and uses gravity and pneumatic methods to transport and load and unload fuel elements. The former uses the favorable geometric shape of spherical fuel elements and relies on gravity to transport them from top to bottom in vertical or inclined pipes; the latter relies on a pneumatic lifting system to achieve the upward transportation of fuel elements. There is a helium gas flow higher than the reactor core pressure in the fuel ball lifting pipe to provide power for the fuel ball lifting. In order to prevent this gas flow from flowing backward into the gravity ball dropping section, resulting in the inability of the fuel balls to drop, or the gas flow entering the reactor core and affecting the flow of the coolant in the reactor core, a flow restrictor is provided in the fuel handling system of the high-temperature gas-cooled reactor. The flow restrictor is mainly used to perform the function of single-direction transportation of spherical elements and the function of gas flow restriction. During normal operation, the main circulation flow restrictor operates 1.095 million times per year. With the long-term high-frequency operation of the equipment, the flow restriction effect of the flow restrictor is greatly weakened due to the wear of the sealing surface, and it needs to be frequently replaced and repaired. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0005] To this end, an embodiment of the present invention provides a flow restrictor with good flow restriction effect and long service life.

[0006] The flow restrictor of the embodiment of the present invention includes a housing, a lining sleeve, a rotor, and a driving component. The housing is provided with a first groove, the lining sleeve is installed in the first groove, the lining sleeve is provided with a second groove, the inner diameter of the second groove gradually increases along the bottom of the second groove to the notch of the second groove in the axial direction of the second groove. The housing and the lining sleeve are provided with a ball inlet channel and a ball outlet channel communicating with the second groove. One end of the rotor is rotatably fitted in the second groove, a ball receiving groove is provided on the outer peripheral wall of the rotor, and the driving component is connected to the other end of the rotor, and the driving component is used to drive the rotor to rotate.

[0007] The baffle of the embodiment of the present invention realizes self-sealing through the cooperation of the rotor conical surface and the bushing conical surface, thereby improving the flow-blocking effect of the baffle. The flow-blocking effect of the baffle will not weaken with the wear of the sealing surface. There is no need to frequently replace and repair the baffle, so the baffle has high reliability and long service life.

[0008] In some embodiments, the rotor includes a rotor body and a first rotor shaft, the rotor body is rotatably fitted in the second groove, the shape of the rotor body matches that of the second groove, one end of the first rotor shaft is connected to the rotor body, and the other end of the first rotor shaft is connected to the drive assembly.

[0009] In some embodiments, the ball scoring channel and the ball outlet channel are arranged opposite to each other in the radial direction of the second groove, there are two ball receiving grooves, and the two ball receiving grooves are arranged opposite to each other in the radial direction of the rotor.

[0010] In some embodiments, a boss is provided at the center of the bottom of the ball receiving groove, the height of the boss is 3-5 mm, and the distance between the upper surface of the boss and the outer peripheral wall of the rotor body is 62-65 mm.

[0011] In some embodiments, the baffle further includes a cover plate, a first step is provided at the notch of the first groove, the cover plate is detachably mounted at the first step by bolts, the first rotor shaft passes through the cover plate, and the cover plate is pressed onto the end face of one end of the rotor body.

[0012] In some embodiments, a second step is further provided at the notch of the first groove, the second step is located on the side of the first step away from the bottom of the first groove, a double sealing groove is opened on the second step, and a sealing ring is provided in the sealing groove.

[0013] In some embodiments, the baffle also includes an end cover, and a third step is further provided at the notch of the first groove, the third step is located on the side of the second step away from the bottom of the first groove, the end cover is detachably mounted on the third step by bolts, the first rotor shaft passes through the end cover, and the end cover presses the cover plate through the sealing ring.

[0014] In some embodiments, the spoiler further includes an upper bearing, a surface of the end cover is provided with a first bearing groove, the first bearing sleeve is arranged on the first rotor shaft and installed in the first bearing installation groove.

[0015] In some embodiments, the baffle also includes a lower bearing, a second bearing groove is provided at the bottom of the second groove, a third groove is provided on the end surface of the rotor body facing away from the first rotor shaft, a second rotor shaft is provided at the bottom of the third groove, and the lower bearing is sleeved on the second rotor shaft and installed in the second bearing groove.

[0016] In some embodiments, the drive assembly includes a motor, a reducer, a coupling and a magnetic transmission, the output shaft of the motor is connected to the input shaft of the reducer, the output end of the reducer is connected to the magnetic transmission through the coupling, and the magnetic transmission is connected to the first rotor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a spoiler according to an embodiment of the present invention.

[0018] Figure 2 is an exploded view of a spoiler according to an embodiment of the present invention.

[0019] Figure 3 is a cross-sectional view of a spoiler according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] 1. Shell; 11. First groove; 12. Goal channel; 13. Ball outlet channel; 14. First step; 15. Second step; 16. Third step; 2. Inner sleeve; 21. Second groove; 3. Rotor; 31. Rotor body; 311. Ball receiving groove; 312. Boss; 32. First rotor shaft; 33. Second rotor shaft; 4. Drive assembly; 41. Motor; 42. Reducer; 43. Coupling; 44. Magnetic actuator; 5. Cover plate; 6. End cover; 7. Upper bearing; 8. Lower bearing; 9. Sealing ring; DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0023] like Figures 1 - 3As shown in the figure, the choke of the embodiment of the present invention includes a housing 1, a lining sleeve 2, a rotor 3 and a driving assembly 4. Among them, the housing 1 is a container with a stepped flange. A first groove 11 is provided on one end face of the housing 1. The lining sleeve 2 is installed in the first groove 11. A second groove 21 is provided on the lining sleeve 2. One end of the rotor 3 is rotatably fitted in the second groove 21. The material of the lining sleeve 2 is preferably a wear-resistant material. A ball receiving groove 311 is provided on the outer peripheral wall of the rotor 3. The housing 1 and the lining sleeve 2 are provided with a ball inlet channel 12 and a ball outlet channel 13 that communicate with the second groove 21. The ball inlet channel 12 is located above the ball outlet channel 13. The driving assembly 4 is connected to the other end of the rotor 3. The driving assembly 4 is used to drive the rotor 3 to rotate.

[0024] It should be noted that the inner diameter of the second groove 21 of the choke of the embodiment of the present invention gradually increases in the axial direction of the second groove 21 from the groove bottom to the groove opening of the second groove 21. In other words, the inner peripheral surface of the second groove 21 is a conical surface, and the cone angle is 3° to 8°. The outer peripheral surface of the rotor 3 is also a conical surface, and its shape corresponds to that of the second groove 21. One end of the rotor 3 is rotatably fitted in the second groove 21.

[0025] When using the choke of the embodiment of the present invention, first, the driving assembly 4 is used to drive the rotor 3 to rotate, align the ball receiving groove 311 with the ball inlet channel 12, and the fuel balls fall into the ball receiving groove 311 through the ball inlet channel 12. Then, the driving assembly 4 drives the rotor 3 to rotate again, rotate the ball receiving groove 311 to the position of the ball outlet channel 13, and under the action of gravity, the fuel balls roll out of the choke through the ball outlet channel 13.

[0026] The conical surface of the rotor 3 cooperating with the conical surface of the lining sleeve 2 can achieve self-sealing, thus achieving the effect of flow resistance. Under the action of high-pressure helium gas downstream, the rotor 3 can be suspended, reducing the wear between the rotor 3 and the lining sleeve 2. When the pressure difference is small, complete sealing can be achieved, improving the flow resistance efficiency of the choke.

[0027] In addition, during operation, the conical sealing surface of the rotor 3 and the conical sealing surface of the lining sleeve 2 will wear. After the wear increases, the rotor 3 sinks downward under the action of the pre-tightening force and its own weight, so that the two conical sealing surfaces always remain in contact, thus enabling the choke to always have a good flow resistance effect.

[0028] The choke of the embodiment of the present invention realizes self-sealing through the cooperation of the conical surface of the rotor 3 and the conical surface of the lining sleeve, thereby enhancing the flow resistance function of the choke. And the flow resistance effect of the choke will not weaken with the wear of the sealing surface, eliminating the need for frequent replacement and maintenance of the choke, with strong reliability and long service life.

[0029] In some embodiments, the rotor 3 includes a rotor body 31 and a first rotor shaft 32. The shape of the rotor body 31 matches that of the second groove 21. The rotor body 31 is frustum-shaped, and the outer peripheral surface of the rotor 3 is a conical surface. The rotor body 31 is rotatably fitted in the second groove 21, and the self-sealing is achieved by the cooperation of the outer peripheral surface of the rotor body 31 and the conical surface of the second groove 21. One end of the first rotor shaft 32 is connected to the rotor body 31, and the other end of the first rotor shaft 32 is connected to the drive assembly 4. The drive assembly 4 can drive the rotor body 31 to rotate through the first rotor shaft 32.

[0030] In some embodiments, the goal channel 12 and the ball outlet channel 13 are arranged opposite to each other along the radial direction of the second groove 21. There are two receiving grooves 311, and the two receiving grooves 311 are arranged opposite to each other along the radial direction of the rotor 3. In other words, the goal channel 12 and the ball outlet channel 13 are coaxially arranged, and the two receiving grooves 311 are coaxially arranged.

[0031] Define the two receiving grooves 311 as the first receiving groove 311 and the second receiving groove 311 respectively. When transporting the fuel balls, the goal channel 12 and the ball outlet channel 13 are arranged opposite to each other in the vertical direction. The drive assembly 4 drives the rotor 3 to rotate to the first working position, and the first receiving groove 311 is coaxially opposite to the goal channel 12. The fuel balls enter the receiving groove 311 under the action of gravity. The drive assembly 4 drives the rotor 3 to rotate 180°. The rotor 3 rotates to the second working position, and the first receiving groove 311 is coaxially opposite to the ball outlet channel 13. The fuel balls roll out of the flow restrictor through the ball outlet channel 13 under the action of gravity. At this time, the second receiving groove 311 is coaxially opposite to the goal channel 12, and another fuel ball enters the second receiving groove 311. The drive assembly 4 drives the rotor 3 to rotate 180° again, and the rotor 3 returns to the first working position again. By repeating the above steps, the fuel balls can be continuously rolled out of the flow restrictor.

[0032] In some embodiments, a boss 312 is provided at the center of the bottom of the receiving groove 311. The height of the boss 312 is 3 - 5 mm, and the distance between the upper surface of the boss 312 and the outer peripheral wall of the rotor body 31 is 62 - 65 mm.

[0033] After the fuel balls enter the receiving groove 311, some dust will fall and accumulate in the receiving groove 311. When the dust accumulates together, it will damage the fuel balls and destroy the fuel balls. After the fuel balls fall into the receiving groove 311, they contact the boss 312. The area of the boss 312 is small. During the rotation of the rotor 3, the dust will fall on the bottom of the receiving groove 311 and will not accumulate on the boss 312, thus avoiding the damage to the fuel balls caused by the accumulated dust.

[0034] In some embodiments, the spoiler also includes a cover plate 5 and an end cover 6, and the notch of the first groove 11 is provided with a first step 14, a second step 15 and a third step 16 from the inside to the outside, wherein the step surfaces of the first step 14 and the third step 16 are provided with threaded holes, the first step 14 is used to assemble the cover plate 5, the third step 16 is used to assemble the end cover 6, and the second step 15 is used to assemble the sealing ring 9.

[0035] Specifically, the cover plate 5 is a flange with a through hole, which is located in the center of the cover plate 5 and is sleeved on the shoulder of the rotor 3. A mounting hole is provided on the outer ring of the cover plate 5, which can be fixed to the first step 14 by bolts. The end face of the cover plate 5 is pressed on the end face of the rotor body 31. A protrusion is provided on one side of the cover plate 5 adjacent to the rotor body 31. By adjusting the height of the protrusion, the preload force applied to the rotor body 31 can be changed, thereby adjusting the flow resistance effect.

[0036] Similarly, the end cover 6 is a pressure-bearing flange with a through hole, the first rotor shaft 32 passes through the through hole on the end cover 6, and a mounting hole is also provided on the outer ring of the end cover 6. The end cover 6 can be fixed on the third step 16 by bolts, and a double sealing groove is provided on the second step 15. A sealing ring 9 is provided in the sealing groove. One end face of the end cover 6 is pressed above the sealing ring 9, thereby tightening the cover plate 5. A circle of bolt holes and sealing grooves are provided on the other end face of the end cover 6 for connecting the end cover 6 to the drive assembly 4.

[0037] Furthermore, the spoiler further includes an upper bearing 7 and a lower bearing 8 , and the rotor 3 is circumferentially positioned by the upper bearing 7 and the lower bearing 8 .

[0038] Specifically, the upper bearing 7 is an angular contact bearing, a first bearing groove is provided on the surface of the end cover 6, and the first bearing sleeve is arranged on the first rotor shaft 32 and installed in the first bearing installation groove.

[0039] The lower bearing 8 is a deep groove ball bearing, the bottom of the second groove 21 is provided with a second bearing groove, the end surface of the rotor body 31 away from the first rotor shaft 32 is provided with a third groove, the bottom of the third groove is provided with a second rotor shaft 33, and the lower bearing 8 is sleeved on the second rotor shaft 33 and installed in the second bearing groove. In this way, the lower bearing 8 is installed in the second bearing groove and the third groove in an embedded manner, which can effectively prevent the tiny graphite dust in the pipeline from entering the bearing and affecting the movement of the bearing, thereby improving the operating reliability of the baffle.

[0040] In some embodiments, the driving assembly 4 includes a motor 41, a speed reducer 42, a coupling 43, and a magnetic drive 44. The motor 41 is a high-speed precision radiation-resistant servo motor. The speed reducer 42 is a high-reduction-ratio speed reducer, which can be a planetary gear speed reducer or a harmonic speed reducer, etc. The output shaft of the motor 41 is connected to the input shaft of the speed reducer 42. The coupling 43 is a flexible coupling, which can be a diaphragm coupling or an elastic pin coupling 43. The magnetic drive 44 is a permanent magnet type transmission device, which transfers power from outside the pressure boundary to inside the pressure boundary through two permanent magnet rotors arranged inside and outside the isolation sleeve. The output end of the speed reducer 42 is connected to the magnetic drive 44 through the coupling 43. The magnetic drive 44 is connected to the first rotor shaft 32. The torque output by the motor 41 is sequentially transmitted to the rotor 3 through the speed reducer 42, the coupling 43, and the magnetic drive 44, thereby driving the rotor 3 to rotate.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0043] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified or limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact via an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0045] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0046] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A choke, characterized in that, Comprising: A housing, on which a first groove is provided; A lining sleeve, which is installed in the first groove. A second groove is provided on the lining sleeve. The inner diameter of the second groove gradually increases along the axial direction of the second groove from the groove bottom to the groove opening. A goal ball channel and a ball outlet channel communicating with the second groove are provided on the housing and the lining sleeve; A rotor, one end of which is rotatably fitted in the second groove. A ball receiving groove is provided on the outer peripheral wall of the rotor. The rotor includes a rotor body and a first rotor shaft. The rotor body is rotatably fitted in the second groove. The shape of the rotor body matches that of the second groove to achieve self-sealing, thereby playing a role in blocking the flow. Under the action of high-pressure helium gas downstream, the rotor is suspended, reducing the wear between the rotor and the lining sleeve; A driving assembly, which is connected to the other end of the rotor and is used to drive the rotor to rotate.

2. The flow restrictor according to claim 1, wherein, One end of the first rotor shaft is connected to the rotor body, and the other end of the first rotor shaft is connected to the driving assembly.

3. The flow restrictor according to claim 2, wherein The goal ball channel and the ball outlet channel are arranged opposite to each other along the radial direction of the second groove. There are two ball receiving grooves, and the two ball receiving grooves are arranged opposite to each other along the radial direction of the rotor.

4. The flow restrictor according to claim 2, characterized in that, A boss is provided at the center of the groove bottom of the ball receiving groove. The height of the boss is 3-5 mm, and the distance between the upper surface of the boss and the outer peripheral wall of the rotor body is 62-65 mm.

5. The flow restrictor according to claim 2, characterized in that, It further includes a cover plate. A first step is provided at the groove opening of the first groove. The cover plate is detachably installed at the first step through bolts. The first rotor shaft penetrates through the cover plate, and the cover plate presses on the end face of one end of the rotor body.

6. The flow restrictor according to claim 5, wherein A second step is further provided at the groove opening of the first groove. The second step is located on the side of the first step away from the groove bottom of the first groove. A double-channel sealing groove is provided on the second step, and a sealing ring is provided in the sealing groove.

7. The flow restrictor according to claim 6, wherein It further includes an end cover. A third step is further provided at the groove opening of the first groove. The third step is located on the side of the second step away from the groove bottom of the first groove. The end cover is detachably installed at the third step through bolts. The first rotor shaft penetrates through the end cover, and the end cover presses the cover plate tightly through the sealing ring.

8. The flow restrictor according to claim 7, wherein, It further includes an upper bearing. A first bearing groove is provided on the surface of the end cover. The first bearing is sleeved on the first rotor shaft and installed in the first bearing installation groove.

9. The flow restrictor according to claim 2, wherein It further includes a lower bearing. A second bearing groove is provided at the groove bottom of the second groove. A third groove is provided on the end face of the rotor body away from the first rotor shaft. A second rotor shaft is provided at the groove bottom of the third groove. The lower bearing is sleeved on the second rotor shaft and installed in the second bearing groove.

10. The flow restrictor according to claim 2, characterized in that, The driving assembly includes a motor, a reducer, a coupling and a magnetic transmission device. The output shaft of the motor is connected to the input shaft of the reducer. The output end of the reducer is connected to the magnetic transmission device through the coupling, and the magnetic transmission device is connected to the first rotor shaft.

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