Wind pressure speed measuring device and measuring method for rotating speed of lower shaft of nuclear centrifugal extractor

Abstract

The invention relates to a wind pressure speed measuring device and method for the rotating speed of a lower shaft of a nuclear centrifugal extractor. The nuclear centrifugal extractor comprises an upper shaft, a coupler, a lower shaft, an isolation plate, a power part, a rotary drum module and an isolation wall. A wind pressure speed measuring device for the rotating speed of a lower shaft of a nuclear centrifugal extractor comprises a pressure difference transmitter, a first pipe and a second pipe. According to the wind pressure speed measuring device for the rotating speed of the lower shaft of the nuclear centrifugal extractor, the rotating speed is measured through the pressure difference, so that the pressure difference transmitter can be arranged outside the isolation wall, normal operation of a measuring instrument is guaranteed, and the rotating speed of the lower shaft can be accurately measured due to the fact that the first pipe faces the lower shaft.

Description

Technical Field

[0001] The present application relates to the technical field of rotating shaft speed measurement, and in particular to a wind pressure speed measuring device and a measuring method for the rotation speed of the lower shaft of a nuclear centrifugal extractor. Background Art

[0002] Nuclear centrifugal extractors are important extraction equipment in the nuclear fuel processing industry, and drum speed is a crucial operating parameter. Due to the need to contain alpha radioactivity, nuclear centrifugal extractors utilize a magnetic coupling. The rotating shaft consists of an upper and lower shaft, separated by an alpha seal ring. The transmission between the upper and lower shafts utilizes a magnetic pole-following coupling for synchronous transmission.

[0003] Because the lower shaft is located in a highly radioactive area, the complex electromagnetic environment created by the magnetic coupling during operation, often accompanied by corrosion from acid and oil gases, makes it unsuitable to install sensors near the lower shaft. Current speed measurement methods rely on inferring the lower shaft's speed by detecting the upper shaft. However, in engineering applications requiring long-term stable operation, this inverse measurement method is unreliable if abnormal operating conditions include asynchrony between the upper and lower shafts. Summary of the Invention

[0004] Based on this, it is necessary to address the current speed measurement method, which infers the lower shaft speed by detecting the upper shaft. However, in engineering applications requiring long-term stable operation, if abnormal operating conditions include upper and lower shaft asynchrony, the above-mentioned reverse measurement method is unreliable. Therefore, a wind pressure speed measurement device and method for measuring the lower shaft speed of a nuclear centrifugal extractor are provided.

[0005] A wind pressure speed measuring device for measuring the rotational speed of the lower shaft of a nuclear centrifugal extractor, the nuclear centrifugal extractor comprising: an upper shaft, a coupling, a lower shaft, an isolation plate, a power unit, a drum module, and an isolation wall, wherein the isolation wall is provided with a power through-hole, the isolation plate covers one side of the power through-hole, the upper shaft is passed through the isolation plate, the power unit is located on the side of the isolation plate facing away from the isolation wall, the two ends of the upper shaft are respectively connected to the power unit and the coupling, and the two ends of the lower shaft are respectively connected to the coupling and the drum module. The wind pressure speed measuring device for measuring the rotational speed of the lower shaft of a nuclear centrifugal extractor comprises:

[0006] A differential pressure transmitter is provided on a side of the isolation wall close to the power unit;

[0007] a wind pressure assembly coaxially connected to the lower shaft and located in the power through hole, wherein the wind pressure assembly is capable of generating wind pressure in a horizontal direction and along the circumference of the lower shaft when rotating with the lower shaft;

[0008] a first pipe, the first pipe being passed through the isolation wall, one end of the first pipe being connected to the differential pressure transmitter, and the other end of the first pipe extending into the power through hole and facing the wind pressure assembly; and

[0009] The second pipe is passed through the isolation wall, one end of the second pipe is connected to the pressure differential transmitter, and the other end extends into the power through hole and is located higher than the wind pressure component.

[0010] During actual operation, the wind pressure speed measuring device for the rotation speed of the lower shaft of the nuclear centrifugal extractor in the present application is arranged such that the opening of the first tube passing through the isolation wall faces the lower shaft, the opening of the second tube is arranged in the power through hole, and a differential pressure transmitter is arranged between the first tube and the second tube, so that during the rotation of the lower shaft, the rotation of the lower shaft drives the generation of air pressure around the lower shaft, and the second tube and the first tube are both in the power through hole, and there is no air pressure change at the end of the second tube facing away from the differential pressure transmitter, so that there is a pressure difference between the ends of the first tube and the second tube that are both in the power through hole and facing away from the differential pressure transmitter, thereby realizing the differential pressure data on the differential pressure transmitter side, and installing and debugging the speed meter when the nuclear centrifugal extractor is not performing extraction work, and measuring the rotation speed of the lower shaft by debugging the speed meter, and the lower shaft rotation speed is generally 500-3000rpm. At the same time, the differential pressure data of the differential pressure transmitter is recorded, and the rotational speed measured by the debugging tachometer is compared with the corresponding differential pressure transmitter data to form a comparison curve. Subsequently, when the nuclear centrifugal extractor is performing extraction work, the differential pressure data of the differential pressure transmitter is first obtained. Then, by comparing the corresponding rotational speed of the curve, the real-time rotational speed of the lower shaft during operation can be obtained. The above-mentioned wind pressure speed measuring device for the rotational speed of the lower shaft of the nuclear centrifugal extractor measures the rotational speed through the pressure difference, so that the differential pressure transmitter can be placed outside the isolation wall to ensure the normal operation of the measuring instrument. Moreover, because the first tube faces the lower shaft, the rotational speed of the lower shaft can be accurately measured.

[0011] In one embodiment, the wind pressure assembly includes a plurality of fan blades and a turbine shaft, the turbine shaft is sleeved on the lower shaft and rotates synchronously with the lower shaft, the plurality of fan blades are evenly spaced around the circumference of the turbine shaft and connected to the turbine shaft, and the opening of the end of the first tube away from the pressure differential transmitter faces the wind pressure assembly.

[0012] In one embodiment, the wind pressure speed measuring device for the lower shaft speed of the nuclear centrifugal extractor also includes a support shell and a turbine shell, the support shell is sleeved on the lower shaft and spaced apart from the lower shaft, the outer wall of the support shell is connected to the side wall of the power through hole, the turbine shell is sleeved on the wind pressure assembly, the lower shaft is passed through the turbine shell, the outer wall of the turbine shell is connected to the inner wall of the support shell, and the end of the first tube facing away from the pressure differential transmitter is passed through the turbine shell and the opening faces the wind pressure assembly.

[0013] In one embodiment, the wind pressure speed measuring device for the lower shaft speed of the nuclear centrifugal extractor further includes a first spacer liquid column and a second spacer liquid column;

[0014] The first tube includes a first connecting section, a first horizontal section, and a second connecting section connected in sequence, the first spacer liquid column is located in the first horizontal section, the end of the second connecting section facing away from the first horizontal section is connected to the differential pressure transmitter, and the end of the first connecting section facing away from the first horizontal section extends into the power through hole and opens toward the lower shaft;

[0015] The first tube includes a third connecting section, a second horizontal section and a fourth connecting section connected in sequence. The end of the fourth connecting section facing away from the second horizontal section is connected to the differential pressure transmitter. The end of the third connecting section facing away from the second horizontal section extends into the power through hole.

[0016] In one embodiment, the first tube further includes a first lifting section and a second lifting section, the first connecting section, the first lifting section, the first horizontal section, the second lifting section and the second connecting section are connected in sequence, and the first lifting section and the second lifting section are both arranged at an angle to the horizontal direction;

[0017] The second tube also includes a third lifting section and a fourth lifting section. The third connecting section, the third lifting section, the second horizontal section, the fourth lifting section and the fourth connecting section are connected in sequence. The third lifting section and the fourth lifting section are both arranged at an angle to the horizontal direction.

[0018] In one embodiment, the first lifting section and the second lifting section both extend in a vertical direction;

[0019] The third lifting section and the fourth lifting section both extend in a vertical direction.

[0020] In one embodiment, the first tube further includes a first extension section and a second extension section, the first connecting section, the first extension section, the second extension section, the first lifting section, the first horizontal section, the second lifting section and the second connecting section are connected in sequence, the first connecting section and the second extension section are arranged horizontally, and the first extension section is arranged vertically;

[0021] The second tube also includes a third extension section and a fourth extension section. The third connecting section, the third extension section, the fourth extension section, the third lifting section, the second horizontal section, the fourth lifting section and the fourth connecting section are connected in sequence. The third connecting section and the fourth extension section are horizontally arranged, and the third extension section is vertically arranged.

[0022] In one embodiment, in the wind pressure speed measuring device for the lower shaft speed of the nuclear centrifugal extractor, the first tube and the second tube are integrally formed of stainless steel.

[0023] In one embodiment, the lengths of the first lifting section, the third lifting section, the first horizontal section, and the second horizontal section are all 10-30 cm.

[0024] A method for measuring the rotational speed of the lower shaft of a nuclear centrifugal extractor using a wind pressure speed measuring device is disclosed. The method comprises the following steps:

[0025] Install and debug a tachometer on the lower shaft, and measure the differential pressure transmitter data corresponding to a speed of 500-3000 rpm;

[0026] Form a comparison curve between the speed measured by the debugging tachometer and the corresponding pressure differential transmitter data;

[0027] The speed regulator and tachometer are removed, and the speed of the lower shaft during operation is measured according to the control curve.

[0028] During actual operation, the wind pressure speed measuring device for the rotation speed of the lower shaft of the nuclear centrifugal extractor in the present application is arranged such that the opening of the first tube passing through the isolation wall faces the lower shaft, the opening of the second tube is arranged in the power through hole, and a differential pressure transmitter is arranged between the first tube and the second tube, so that during the rotation of the lower shaft, the rotation of the lower shaft drives the generation of air pressure around the lower shaft, and the second tube and the first tube are both in the power through hole, and there is no air pressure change at the end of the second tube facing away from the differential pressure transmitter, so that there is a pressure difference between the ends of the first tube and the second tube that are both in the power through hole and facing away from the differential pressure transmitter, thereby realizing the differential pressure data on the differential pressure transmitter side, and installing and debugging the speed meter when the nuclear centrifugal extractor is not performing extraction work, and measuring the rotation speed of the lower shaft by debugging the speed meter, and the lower shaft rotation speed is generally 500-3000rpm. At the same time, the differential pressure data of the differential pressure transmitter is recorded, and the rotational speed measured by the debugging tachometer is compared with the corresponding differential pressure transmitter data to form a comparison curve. Subsequently, when the nuclear centrifugal extractor is performing extraction work, the differential pressure data of the differential pressure transmitter is first obtained. Then, by comparing the corresponding rotational speed of the curve, the real-time rotational speed of the lower shaft during operation can be obtained. The above-mentioned wind pressure speed measuring device for the rotational speed of the lower shaft of the nuclear centrifugal extractor measures the rotational speed through the pressure difference, so that the differential pressure transmitter can be placed outside the isolation wall to ensure the normal operation of the measuring instrument. Moreover, because the first tube faces the lower shaft, the rotational speed of the lower shaft can be accurately measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a schematic diagram of a nuclear centrifugal extractor equipped with a wind pressure speed measuring device for measuring the rotation speed of the lower shaft of the nuclear centrifugal extractor according to one embodiment.

[0030] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0031] Description of Figure Numbers:

[0032] 10- Wind pressure speed measuring device for the lower shaft speed of nuclear centrifugal extractor;

[0033] 100-Differential pressure transmitter;

[0034] 200 - first tube; 210 - first spacer liquid column; 220 - first connecting section; 230 - first extension section; 240 - second extension section; 250 - first lifting section; 260 - first horizontal section; 270 - second lifting section; 280 - second connecting section;

[0035] 300 - second tube; 310 - second spacer liquid column; 320 - third connecting section; 330 - third extension section; 340 - fourth extension section; 350 - third lifting section; 360 - second horizontal section; 370 - fourth lifting section; 380 - fourth connecting section;

[0036] 400-wind pressure assembly; 410-fan blades; 420-turbine shaft;

[0037] 500-support shell; 510-support cylinder; 520-clamping ring;

[0038] 600-turbine housing; 610-first fixing portion; 620-second fixing portion;

[0039] 20 - nuclear centrifugal extractor; 21 - upper shaft; 22 - coupling; 23 - lower shaft; 24 - isolation plate; 25 - power unit; 26 - drum module; 27 - isolation wall; 27a - power through hole. DETAILED DESCRIPTION

[0040] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0042] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0043] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0044] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0045] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0046] See Figure 1 , Figure 1 A structural schematic diagram shows a wind pressure speed measuring device 10 for measuring the rotational speed of the lower shaft of a nuclear centrifugal extractor in an embodiment of the present application, which is installed on a nuclear centrifugal extractor 20. The wind pressure speed measuring device 10 for measuring the rotational speed of the lower shaft of a nuclear centrifugal extractor provided in an embodiment of the present application includes: a differential pressure transmitter 100, a first tube 200, a second tube 300 and a wind pressure assembly 400.

[0047] The above-mentioned wind pressure speed measuring device 10 for measuring the rotational speed of the lower shaft of a nuclear centrifugal extractor is installed on a nuclear centrifugal extractor 20, wherein the nuclear centrifugal extractor 20 includes: an upper shaft 21, a coupling 22, a lower shaft 23, an isolation plate 24, a power unit 25, a drum module 26 and an isolation wall 27, wherein the isolation wall is provided with a power through hole 27a, the isolation plate 24 covers one side of the power through hole 27a, the upper shaft 21 is passed through the isolation plate 24, the power unit 25 is located on the side of the isolation plate 24 away from the isolation wall 27, the two ends of the upper shaft 21 are respectively connected to the power unit 25 and the coupling 22, and the two ends of the lower shaft 23 are respectively connected to the coupling 22 and the drum module 26. In the wind pressure speed measuring device 10 for measuring the rotational speed of the lower shaft of a nuclear centrifugal extractor of the present application, the differential pressure transmitter 100 is arranged on the side of the isolation wall 27 close to the power unit 25. The wind pressure assembly 400 is coaxially connected to the lower shaft 23 and located within the power through-hole 27a. When the wind pressure assembly rotates with the lower shaft 23, it generates wind pressure directed horizontally and along the circumference of the lower shaft 23. A first tube 200 is inserted through the partition wall 27. One end of the first tube 200 is connected to the differential pressure transmitter 100, and the other end extends into the power through-hole 27a and faces the wind pressure assembly 400. A second tube 300 is inserted through the partition wall 27. One end of the second tube 300 is connected to the differential pressure transmitter 100, and the other end extends into the power through-hole 27a and is positioned higher than the wind pressure assembly 400.

[0048] During actual operation, the wind pressure speed measuring device 10 for the lower shaft speed of the nuclear centrifugal extractor in the present application is arranged such that the opening of the first tube 200 passing through the isolation wall 27 faces the wind pressure assembly 400 that rotates with the lower shaft 23, and the opening of the second tube 300 is arranged in the power through hole 27a to ensure that the second tube 300 and the end of the first tube 200 away from the pressure differential transmitter 100 are in the same space, and the pressure differential transmitter 100 is arranged between the first tube 200 and the second tube 300, so that during the rotation of the lower shaft 23, the rotation of the lower shaft 23 drives the air pressure around the wind pressure assembly 400. Since the first tube 200 faces the wind pressure assembly 400, the gas flow generated by the rotation of the wind pressure assembly 400 will smoothly enter the first tube 200 along the axial direction of the opening of the first tube 200, and the second tube 300 and the first tube 200 are in the power through hole 27a and are connected to the wind pressure assembly 400 has a height difference, and there is basically no air pressure change at the end of the second tube 300 away from the pressure differential transmitter 100, so that the first tube 200 and the second tube 300 in the power through hole 27a away from the pressure differential transmitter 100 have a pressure difference due to the height difference relative to the wind pressure component 400, thereby realizing the pressure differential data on the pressure differential transmitter 100 side. When the nuclear centrifugal extractor 20 is not performing extraction work, a debugging tachometer is installed and debugged. The rotation speed of the lower shaft 23 is measured by the debugging tachometer, and the pressure differential data of the pressure differential transmitter 100 is recorded at the same time. The rotation speed measured by the debugging tachometer is formed into a comparison curve with the corresponding pressure differential transmitter 100 data. Then, when the nuclear centrifugal extractor 20 is performing extraction work, the pressure differential data of the pressure differential transmitter 100 is first obtained, and then the real-time rotation speed of the lower shaft 23 during operation can be obtained by comparing the corresponding rotation speed of the curve. The above-mentioned wind pressure speed measuring device 10 for the lower shaft speed of the nuclear centrifugal extractor measures the speed through the pressure difference, so that the pressure difference transmitter 100 can be set outside the isolation wall 27 to ensure the normal operation of the measuring instrument, and because the first tube 200 faces the lower shaft 23, the speed of the lower shaft 23 can be accurately measured.

[0049] In one embodiment, the wind pressure velocity measuring device 10 for measuring the lower shaft speed of a nuclear centrifugal extractor further includes a wind pressure assembly 400, which includes a plurality of blades 410 and a turbine shaft 420. The turbine shaft 420 is sleeved on the lower shaft 23 and rotates synchronously with the lower shaft 23. The plurality of blades 410 are evenly spaced around the circumference of the turbine shaft 420 and connected to the turbine shaft 420. The opening of the end of the first tube 200 facing away from the differential pressure transmitter 100 faces the wind pressure assembly 400. In this embodiment, by arranging the turbine shaft 420 to rotate synchronously with the lower shaft 23, and by arranging the plurality of blades 410 evenly spaced around the circumference of the shaft, the blades 410 rotate with the turbine shaft 420, thereby amplifying the gas flow and pressure changes generated by the lower shaft rotation, thereby amplifying the pressure differential data of the differential pressure transmitter 100 and improving measurement accuracy. Moreover, the evenly spaced arrangement of the plurality of blades 410 around the circumference of the turbine shaft 420 ensures that the surrounding air pressure remains stable during the rotation of the lower shaft 23.

[0050] In one embodiment, the wind pressure velocity measuring device 10 for measuring the rotational speed of the lower shaft of a nuclear centrifugal extractor further includes a support housing 500 and a turbine housing 600. The support housing 500 is sleeved on the lower shaft 23 and spaced apart from the lower shaft 23. The outer wall of the support housing 500 is connected to the side wall of the power through hole 27a. The turbine housing 600 is sleeved on the wind pressure assembly 400. The lower shaft 23 is passed through the turbine housing 600. The outer wall of the turbine housing 600 is connected to the inner wall of the support housing 500. The end of the first tube 200 facing away from the differential pressure transmitter 100 is passed through the turbine housing 600 and opens toward the wind pressure assembly 400. In this embodiment, the end of the first tube 200 facing away from the differential pressure transmitter 100 is located inside the worm gear housing, thereby ensuring that the air pressure generated by the rotation of the lower shaft 23 can be stably transmitted to the first tube 200, thereby ensuring accurate measurement data of the differential pressure transmitter 100.

[0051] Specifically, when the turbine housing 600 is not provided, the fan blade 410 is in a sheet shape, and the extension surface of the fan blade 410 is perpendicular to the horizontal direction, thereby generating wind pressure toward the horizontal direction and along the circumference of the lower shaft 23.

[0052] See Figure 1 and Figure 2In one embodiment, the wind pressure velocity measuring device 10 for measuring the lower shaft speed of a nuclear centrifugal extractor further includes a first spacer liquid column 210 and a second spacer liquid column 310. The first tube 200 includes a first connecting section 220, a first horizontal section 260, and a second connecting section 280, which are connected in sequence. The first spacer liquid column 210 is located in the first horizontal section 260. The end of the second connecting section 280 facing away from the first horizontal section 260 is connected to the differential pressure transmitter 100. The end of the first connecting section 220 facing away from the first horizontal section 260 extends into the power through hole 27a and opens toward the lower shaft 23. The first tube 200 includes a third connecting section 320, a second horizontal section 360, and a fourth connecting section 380, which are connected in sequence. The end of the fourth connecting section 380 facing away from the second horizontal section 360 is connected to the differential pressure transmitter 100. The end of the third connecting section 320 facing away from the second horizontal section 360 extends into the power through hole 27a. In this embodiment, by arranging the first isolation liquid column 210 to be located in the first tube 200 and the second isolation liquid column 310 to be located in the second tube 300, the radioactive atmosphere in the power through hole 27a is isolated from the differential pressure transmitter 100, thereby protecting the differential pressure transmitter 100. At the same time, the first isolation liquid column 210 is located in the first horizontal section 260, and the second isolation liquid column 310 is located in the second horizontal section 360. By arranging connecting sections on both sides, the horizontal sections are connected to the differential pressure transmitter 100 and the power through hole 27a respectively. The first horizontal section 260 and the second horizontal section 360 can ensure that no additional pressure difference is generated due to gravity during the movement of the first isolation liquid column 210 and the second isolation liquid column 310, thereby ensuring accurate pressure differential measurement.

[0053] See Figure 1 and Figure 2In one embodiment, the first tube 200 further includes a first lifting section 250 and a second lifting section 270. The first connecting section 220, the first lifting section 250, the first horizontal section 260, the second lifting section 270, and the second connecting section 280 are sequentially connected, and the first lifting section 250 and the second lifting section 270 are both arranged at an angle to the horizontal. The second tube 300 further includes a third lifting section 350 and a fourth lifting section 370. The third connecting section 320, the third lifting section 350, the second horizontal section 360, the fourth lifting section 370, and the fourth connecting section 380 are sequentially connected, and the third lifting section 350 and the fourth lifting section 370 are both arranged at an angle to the horizontal. Since the first spacer liquid column easily enters the differential pressure transmitter 100 and the second spacer liquid column 310 easily escapes from the second tube 300 during the process of generating a pressure difference, the first spacer liquid column 210 easily escapes from the first tube 200 after the nuclear centrifugal extractor 20 stops working. Therefore, in order to ensure that the first spacer liquid column 210 and the second spacer liquid column 310 are stably located in the first tube 200 and the second tube 300, in this embodiment, a first lifting section 250 and a second lifting section 270 are provided at both ends of the first horizontal section 260 at an angle to the horizontal direction, thereby preventing the first spacer liquid column 210 from escaping from the first horizontal section 260. Similarly, a third lifting section 350 and a fourth lifting section 370 are provided at both ends of the second horizontal section 360 at an angle to the horizontal direction, thereby preventing the second spacer liquid column 310 from escaping from the second horizontal section 360.

[0054] See Figure 1 and Figure 2 In one embodiment, the first lifting section 250 and the second lifting section 270 both extend vertically. The third lifting section 350 and the fourth lifting section 370 both extend vertically. This reduces the space occupied and the length of the first tube 200 and the second tube 300, thereby making the wind pressure velocity measuring device 10 for measuring the rotational speed of the lower shaft of a nuclear centrifugal extractor even smaller and more convenient for installation on nuclear centrifugal extractors 20 of various specifications to measure the rotational speed of the lower shaft 23.

[0055] See Figure 1 and Figure 2In one embodiment, the first tube 200 further includes a first extension section 230 and a second extension section 240. The first connecting section 220, the first extension section 230, the second extension section 240, the first lifting section 250, the first horizontal section 260, the second lifting section 270, and the second connecting section 280 are sequentially connected. The first connecting section 220 and the second extension section 240 are arranged horizontally, and the first extension section 230 is arranged vertically. The second tube 300 further includes a third extension section 330 and a fourth extension section 340. The third connecting section 320, the third extension section 330, the fourth extension section 340, the third lifting section 350, the second horizontal section 360, the fourth lifting section 370, and the fourth connecting section 380 are sequentially connected. The third connecting section 320 and the fourth extension section 340 are arranged horizontally, and the third extension section 330 is arranged vertically.

[0056] Typically, the axes of the upper shaft 21 and lower shaft 23 of the nuclear centrifugal extractor 20 extend vertically. Therefore, the first connecting section 220 and the third connecting section 320 are both horizontally arranged. The first lifting section 250 is configured to extend vertically through the first extension section 230 and horizontally through the second extension section 240, connecting the first connecting section 220 and the first lifting section 250. The third lifting section 350 is configured to extend vertically through the third extension section 330 and horizontally through the fourth extension section 340, connecting the third connecting section 320 and the third lifting section 350.

[0057] See Figure 1 and Figure 2 In one embodiment, in the wind pressure speed measuring device 10 for the lower shaft speed of a nuclear centrifugal extractor, the first tube 200 and the second tube 300 are integrally formed of stainless steel, so that the channels for gas circulation in the first tube 200 and the second tube 300 can be fixed and kept unobstructed, avoiding gas blockage caused by the use of hoses, and the integral molding can avoid leakage caused by too many connections.

[0058] In one embodiment, the lengths of the first lifting section 250, the third lifting section 350, the first horizontal section 260, and the second horizontal section 360 are all 10-30 cm. Preferably, the lengths of the first lifting section 250, the third lifting section 350, the first horizontal section 260, and the second horizontal section 360 are all 20 cm.

[0059] Preferably, the wind pressure speed measuring device 10 for the lower shaft speed of a nuclear centrifugal extractor also includes a first fixing part 610 and a second fixing part 620, and the lower shaft 23 is sequentially inserted into the second fixing part 620 and the first fixing part 610, and the lower shaft 23 rotates with the first fixing part 610, and the lower shaft 23 rotates with the second fixing part 620, and the side wall of the first fixing part 610 is connected to the inner wall of the support shell 500, and the second fixing part 620 is connected to the first fixing part 610 at one end along the axial direction of the lower shaft 23, and the other end is connected to the turbine shell 600 for supporting the turbine shell 600.

[0060] Specifically, the spacing of the inner walls of the support shell 500 gradually decreases along the axial direction of the lower shaft 23 approaching the drum module 26, and the first fixing portion 610 is adapted to the inner wall of the support shell 500, so that the first fixing portion 610 is engaged with the inner wall of the support shell 500 through gravity, thereby fixing the first fixing portion 610 relative to the support shell 500. If the first fixing portion 610 needs to be removed, it is only necessary to lift the first fixing portion 610.

[0061] Specifically, the support shell 500 is cylindrical, including a support cylinder 510 and a clamping ring 520. The support cylinder 510 is passed through the power through hole 27a, and the first axis and the second axis are passed through the clamping ring 520 and the support cylinder 510. The inner ring of the clamping ring 520 is connected to the outer wall of the end of the support cylinder 510 close to the power part 25. The clamping ring 520 is abutted against the side of the isolation wall 27 close to the power part 25. The clamping ring 520 is located between the isolation plate 24 and the isolation wall 27, so that the clamping ring 520 is abutted against the isolation wall 27 by gravity, and the first fixing part 610 is lifted and can be taken out of the support shell 500.

[0062] A method for measuring the rotational speed of the lower shaft of a nuclear centrifugal extractor using a wind pressure velocity measuring device 10 is provided. The method uses the wind pressure velocity measuring device 10 to measure the rotational speed of the lower shaft of a nuclear centrifugal extractor. The method comprises the following steps:

[0063] A tachometer is installed and debugged on the lower shaft 23, and the differential pressure transmitter 100 data corresponding to a rotation speed of 500-3000 rpm is measured.

[0064] A comparison curve is formed between the rotation speed measured by the debugging tachometer and the corresponding data of the differential pressure transmitter 100.

[0065] The speed regulator and tachometer are removed, and the speed of the lower shaft 23 during operation is measured according to the control curve.

[0066] During actual operation, the wind pressure speed measuring device 10 for the lower shaft speed of a nuclear centrifugal extractor in the present application is directed toward the wind pressure assembly 400 that rotates with the lower shaft 23 through the opening of the first tube 200 that passes through the isolation wall 27, and the opening of the second tube 300 is set in the power through-hole 27a to ensure that the second tube 300 and the end of the first tube 200 that is away from the pressure differential transmitter 100 are in the same space, and the pressure differential transmitter 100 is set between the first tube 200 and the second tube 300, so that during the rotation of the lower shaft 23, the rotation of the lower shaft 23 drives the air pressure around the wind pressure assembly 400 to be generated. Since the first tube 200 is directed toward the wind pressure assembly 400, the gas flow generated by the rotation of the wind pressure assembly 400 will smoothly enter the first tube 200 along the axial direction of the opening of the first tube 200, and the second tube 300 and the first tube 200 are in the power through-hole 27a and have a height difference with the wind pressure assembly 400. There is basically no air pressure change at the end of the tube 300 that is away from the pressure differential transmitter 100, so that the first tube 200 and the second tube 300 in the power through hole 27a that are away from the pressure differential transmitter 100 have a pressure difference due to the height difference relative to the wind pressure component 400, thereby realizing the pressure differential data on the pressure differential transmitter 100 side. When the nuclear centrifugal extractor 20 is not performing extraction work, a debugging tachometer is installed and debugged, and the rotation speed of the lower shaft 23 is measured by the debugging tachometer. Generally, the rotation speed of the lower shaft 23 is 500-3000rpm. At the same time, the pressure differential data of the pressure differential transmitter 100 is recorded, and the rotation speed measured by the debugging tachometer is formed into a comparison curve with the corresponding pressure differential transmitter 100 data. Then, when the nuclear centrifugal extractor 20 is performing extraction work, the pressure differential data of the pressure differential transmitter 100 is first obtained, and then the real-time rotation speed of the lower shaft 23 during operation can be obtained by comparing the corresponding rotation speed of the curve. The above-mentioned wind pressure speed measuring device 10 for the lower shaft speed of the nuclear centrifugal extractor measures the speed through the pressure difference, so that the pressure difference transmitter 100 can be set outside the isolation wall 27 to ensure the normal operation of the measuring instrument, and because the first tube 200 faces the lower shaft 23, the speed of the lower shaft 23 can be accurately measured.

[0067] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A wind pressure speed measuring device for the lower shaft speed of a nuclear centrifugal extractor, the nuclear centrifugal extractor comprising: An upper shaft, a coupling, a lower shaft, an isolation plate, a power unit, a drum module, and an isolation wall, wherein the isolation wall is provided with a power through hole, the isolation plate covers one side of the power through hole, the upper shaft is passed through the isolation plate, the power unit is located on the side of the isolation plate away from the isolation wall, the two ends of the upper shaft are respectively connected to the power unit and the coupling, and the two ends of the lower shaft are respectively connected to the coupling and the drum module, characterized in that the wind pressure speed measuring device for the lower shaft speed of the nuclear centrifugal extractor includes: A differential pressure transmitter is provided on a side of the isolation wall close to the power unit; a wind pressure assembly coaxially connected to the lower shaft and located in the power through hole, wherein the wind pressure assembly is capable of generating wind pressure in a horizontal direction and along the circumference of the lower shaft when rotating with the lower shaft; a first pipe, the first pipe being passed through the isolation wall, one end of the first pipe being connected to the differential pressure transmitter, and the other end of the first pipe extending into the power through hole and facing the wind pressure assembly; and The second pipe is passed through the isolation wall, one end of the second pipe is connected to the pressure differential transmitter, and the other end extends into the power through hole and is located higher than the wind pressure component.

2. The wind pressure speed measuring device for the lower shaft speed of a nuclear centrifugal extractor according to claim 1, characterized in that: The wind pressure assembly includes a plurality of fan blades and a turbine shaft. The turbine shaft is sleeved on the lower shaft and rotates synchronously with the lower shaft. The plurality of fan blades are evenly spaced around the circumference of the turbine shaft and connected to the turbine shaft. The opening of the end of the first tube away from the pressure differential transmitter faces the wind pressure assembly.

3. The wind pressure speed measuring device for the lower shaft speed of a nuclear centrifugal extractor according to claim 2, characterized in that: The wind pressure speed measuring device for the lower shaft speed of the nuclear centrifugal extractor also includes a support shell and a turbine shell. The support shell is sleeved on the lower shaft and spaced apart from the lower shaft. The outer wall of the support shell is connected to the side wall of the power through hole. The turbine shell is sleeved on the wind pressure component. The lower shaft is passed through the turbine shell. The outer wall of the turbine shell is connected to the inner wall of the support shell. The end of the first tube facing away from the differential pressure transmitter is passed through the turbine shell and the opening faces the wind pressure component.

4. The wind pressure speed measuring device for the lower shaft speed of a nuclear centrifugal extractor according to claim 1, characterized in that: The wind pressure speed measuring device for the lower shaft speed of the nuclear centrifugal extractor further comprises a first spacer liquid column and a second spacer liquid column; The first tube includes a first connecting section, a first horizontal section, and a second connecting section connected in sequence, the first spacer liquid column is located in the first horizontal section, the end of the second connecting section facing away from the first horizontal section is connected to the differential pressure transmitter, and the end of the first connecting section facing away from the first horizontal section extends into the power through hole and opens toward the lower shaft; The first tube includes a third connecting section, a second horizontal section and a fourth connecting section connected in sequence. The end of the fourth connecting section facing away from the second horizontal section is connected to the differential pressure transmitter. The end of the third connecting section facing away from the second horizontal section extends into the power through hole.

5. The wind pressure speed measuring device for the lower shaft speed of a nuclear centrifugal extractor according to claim 4, characterized in that: The first tube further includes a first lifting section and a second lifting section, the first connecting section, the first lifting section, the first horizontal section, the second lifting section and the second connecting section are connected in sequence, and the first lifting section and the second lifting section are both arranged at an angle to the horizontal direction; The second tube also includes a third lifting section and a fourth lifting section. The third connecting section, the third lifting section, the second horizontal section, the fourth lifting section and the fourth connecting section are connected in sequence. The third lifting section and the fourth lifting section are both arranged at an angle to the horizontal direction.

6. The wind pressure speed measuring device for the lower shaft speed of a nuclear centrifugal extractor according to claim 5, characterized in that: The first lifting section and the second lifting section both extend in a vertical direction; The third lifting section and the fourth lifting section both extend in a vertical direction.

7. The wind pressure speed measuring device for the lower shaft speed of a nuclear centrifugal extractor according to claim 6, characterized in that: The first tube further includes a first extension section and a second extension section, the first connecting section, the first extension section, the second extension section, the first lifting section, the first horizontal section, the second lifting section and the second connecting section are connected in sequence, the first connecting section and the second extension section are arranged horizontally, and the first extension section is arranged vertically; The second tube also includes a third extension section and a fourth extension section. The third connecting section, the third extension section, the fourth extension section, the third lifting section, the second horizontal section, the fourth lifting section and the fourth connecting section are connected in sequence. The third connecting section and the fourth extension section are horizontally arranged, and the third extension section is vertically arranged.

8. The wind pressure speed measuring device for the lower shaft speed of a nuclear centrifugal extractor according to claim 7, characterized in that: In the wind pressure speed measuring device for the lower shaft speed of the nuclear centrifugal extractor, the first tube and the second tube are integrally formed of stainless steel.

9. The wind pressure speed measuring device for the lower shaft speed of a nuclear centrifugal extractor according to claim 7, characterized in that: The lengths of the first lifting section, the third lifting section, the first horizontal section, and the second horizontal section are all 10-30 cm.

10. A method for measuring the rotational speed of the lower shaft of a nuclear centrifugal extractor using a wind pressure speed measuring device, wherein the rotational speed of the lower shaft of the nuclear centrifugal extractor is measured using the wind pressure speed measuring device of claims 1 to 9, characterized in that: The method for measuring the wind pressure speed measuring device of the lower shaft speed of the nuclear centrifugal extractor comprises the following steps: Install and debug a tachometer on the lower shaft, and measure the differential pressure transmitter data corresponding to a speed of 500-3000 rpm; Form a comparison curve between the speed measured by the debugging tachometer and the corresponding pressure differential transmitter data; The speed regulator and tachometer are removed, and the speed of the lower shaft during operation is measured according to the control curve.

Images