High-speed neutron chopper

Abstract

The invention relates to the technical field of spallation neutron sources, in particular to a high-speed neutron chopper which comprises a shell, a rotor shaft, a chopping disc assembly, a magnetic suspension bearing assembly and a power part. The shell comprises a disc body and a shaft body, a vacuum cavity is formed in the disc body and the shaft body, a chopping disc assembly is arranged in the vacuum cavity, the shaft body is symmetrically arranged on the two sides of the disc body, a rotor shaft is arranged in the shaft body, the chopping disc assembly is installed on the rotor shaft, and the chopping disc assembly can synchronously rotate along with the rotor shaft; the rotor shaft is symmetrically sleeved with the magnetic suspension bearing assemblies, and the magnetic suspension bearing assemblies can enable the rotor shaft to be always located at the center line position of the shaft body; the output end of the power piece is connected with the rotor shaft, and the power piece is used for driving the rotor shaft to rotate. According to the high-speed neutron chopper provided by the invention, the rotating speed of the rotor shaft can be effectively increased, the service life of the rotor shaft can be effectively prolonged, the chopper disc assembly can be applicable to a higher rotating speed, and the overall high-rotating-speed applicability of the neutron chopper is improved.

Description

Technical Field

[0001] The invention relates to the technical field of spallation neutron sources, and in particular to a high-speed neutron chopper. Background Art

[0002] The spallation neutron source uses an accelerator to drive high-energy protons to bombard heavy metal targets, thereby obtaining a neutron beam with a high neutron flux. The fast neutron beam is generated in time with the proton beam hitting the target, that is, the neutron beam emitted at the zero moment of each pulse cycle of the spallation neutron source. If it is not eliminated, it will affect the subsequent research.

[0003] At present, the existing choppers use mechanical bearings for operation. The speed of neutron choppers mostly does not exceed 6000 rpm, which is too low to meet the new demand for higher speeds in scientific research, and is not applicable when facing the demand for ultra-high speeds. It will also lead to a significant decrease in the service life of mechanical bearings, and the efficiency of equipment use cannot be guaranteed, while also increasing daily maintenance costs. Summary of the invention

[0004] (I) The present invention provides a high-speed neutron chopper, which alleviates the technical problems that the neutron chopper in the prior art cannot be used for ultra-high speed and has a low service life.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a high-speed neutron chopper, including a housing, a rotor shaft, a chopper disk assembly, a magnetic suspension bearing assembly and a power part;

[0007] The housing comprises a disc body and a shaft body, wherein a vacuum chamber is formed inside the disc body and the shaft body, wherein the chopper disc assembly is arranged inside the vacuum chamber, wherein the shaft body is symmetrically arranged on both sides of the disc body, wherein the rotor shaft is arranged inside the shaft body, wherein the chopper disc assembly is mounted on the rotor shaft, and wherein the chopper disc assembly can rotate synchronously with the rotor shaft;

[0008] The magnetic bearing assembly is symmetrically sleeved on the rotor shaft, and the magnetic bearing assembly can make the rotor shaft always be located at the center line position of the shaft body;

[0009] The output end of the power member is connected to the rotor shaft, and the power member is used to drive the rotor shaft to rotate.

[0010] Furthermore, the magnetic bearing assembly includes two magnetic bearing groups, and the two magnetic bearing groups are symmetrically arranged on the rotor shaft in the shaft body at both sides of the disc body.

[0011] Furthermore, each of the magnetic bearing groups includes two radial magnetic bearings and two axial magnetic bearings, the two radial magnetic bearings are spaced apart and sleeved on the rotor shaft, the power component is disposed between the two radial magnetic bearings, and the two axial magnetic bearings are symmetrically disposed at the ends of the rotor shaft and at the connection between the rotor shaft and the chopper disk assembly.

[0012] Furthermore, an eddy current sensor is provided on a side of each radial magnetic bearing facing away from the power component, and the eddy current sensor is used to detect the position of the rotor shaft.

[0013] Furthermore, the high-speed neutron chopper also includes a controller, which is electrically connected to each of the eddy current sensors, the radial magnetic bearing and the power component respectively.

[0014] Furthermore, protective bearings are provided at both ends of the rotor shaft.

[0015] Furthermore, a pressure release device is provided at the bottom of the disk body, and the pressure release device is communicated with the vacuum chamber.

[0016] Furthermore, a negative pressure-resistant sheet is provided at one end of the pressure release device that is connected to the vacuum chamber.

[0017] Furthermore, the chopper disk assembly includes two chopper disks, and the two chopper disks are installed in parallel on the rotor shaft.

[0018] Furthermore, a vacuum generator is installed on the outer wall of the disk body, and the vacuum generator is connected to the vacuum chamber.

[0019] Beneficial effects of the present invention: A high-speed neutron chopper provided by the present invention comprises a shell, a rotor shaft, a chopper disk assembly, a magnetic bearing assembly and a power part, the shell comprises a disk body and a shaft body, a vacuum chamber is formed inside the disk body and the shaft body, the chopper disk assembly is arranged in the vacuum chamber, and then the rotor shaft is arranged inside the shaft body arranged on both sides of the disk body, the chopper disk assembly is directly mounted on the rotor shaft, and can rotate synchronously with the rotor shaft, a magnetic bearing assembly is sleeved on the outer side of the rotor shaft, the magnetic bearing assembly is used to ensure that the rotor shaft is always at the center line position of the shaft body, the rotor shaft is directly driven to rotate by itself through the power part to drive the chopper disk assembly to rotate synchronously, and since the magnetic bearing assembly can be frictionless with the rotor shaft during operation, the rotation speed and service life of the rotor shaft can be effectively improved, the applicability of the chopper disk assembly to higher rotation speeds can be met, and the overall high-speed applicability of the neutron chopper is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the overall appearance of a high-speed neutron chopper provided by an embodiment of the present invention;

[0022] Figure 2 A front view of the overall appearance of a high-speed neutron chopper provided by an embodiment of the present invention;

[0023] Figure 3 A side view of the overall appearance of a high-speed neutron chopper provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the internal structure of a high-speed neutron chopper provided in an embodiment of the present invention.

[0025] Icons: 100-housing; 101-disk; 102-shaft; 103-radial magnetic bearing; 104-axial magnetic bearing; 105-eddy current sensor; 106-protective bearing; 107-pressure release device; 108-base; 109-vertical plate; 110-stator coil; 111-rotor core; 112-exhaust plate;

[0026] 200- rotor shaft;

[0027] 300-Chopping plate;

[0028] 400-power parts;

[0029] 500 - Vacuum generator. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are 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 cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the inside of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] like Figures 1 to 4 As shown, the present invention provides a high-speed neutron chopper, including a housing 100, a rotor shaft 200, a chopper disk assembly, a magnetic suspension bearing assembly and a power piece 400; the housing 100 includes a disk body 101 and a shaft body 102, a vacuum chamber is formed inside the disk body 101 and the shaft body 102, a chopper disk assembly is arranged in the vacuum chamber, the shaft body 102 is symmetrically arranged on both sides of the disk body 101, a rotor shaft 200 is arranged inside the shaft body 102, the chopper disk assembly is installed on the rotor shaft 200, and the chopper disk assembly can rotate synchronously with the rotor shaft 200; the magnetic suspension bearing assembly is symmetrically sleeved on the rotor shaft 200, and the magnetic suspension bearing assembly can make the rotor shaft 200 always be at the center line position of the shaft body 102; the output end of the power piece 400 is connected to the rotor shaft 200, and the power piece 400 is used to drive the rotor shaft 200 to rotate.

[0034] In this embodiment, the high-speed neutron chopper includes a housing 100, a rotor shaft 200, a chopper disk assembly, a magnetic suspension bearing assembly and a power member 400. The housing 100 includes a disk body 101 and a shaft body 102. A vacuum cavity is formed inside the disk body 101 and the shaft body 102, and the chopper disk assembly is arranged in the vacuum cavity. The rotor shaft 200 is then arranged inside the shaft body 102 on both sides of the disk body 101. The chopper disk assembly is directly mounted on the rotor shaft 200 and can rotate synchronously with the rotor shaft 200. 00 is provided with a magnetic bearing assembly on the outer side, through which the rotor shaft 200 is always located at the center line position of the shaft body 102, and the power piece 400 directly drives the rotor shaft 200 to rotate, thereby driving the chopper disk assembly to rotate synchronously. Since the magnetic bearing assembly and the rotor shaft 200 are frictionless during operation, the rotation speed and service life of the rotor shaft 200 can be effectively improved, which can meet the applicability of the chopper disk assembly to higher rotation speeds and improve the overall high-speed applicability of the neutron chopper.

[0035] Among them, preferably, the high-speed neutron chopper also includes a base 108, on which a vertical plate 109 is arranged, and the vertical plate 109 is vertically fixed on the base 108. The disk body 101 is arranged on one side of the vertical plate 109, and a cantilever structure is formed between the disk body 101, the shaft body 102 and the vertical plate 109, which can effectively facilitate installation and daily maintenance.

[0036] According to an embodiment provided by the present invention, Figure 1 and Figure 4 As shown, the magnetic bearing assembly includes two magnetic bearing groups, and the two magnetic bearing groups are symmetrically arranged on the rotor shaft 200 in the shaft body 102 on both sides of the disc body 101.

[0037] In this embodiment, two magnetic bearing groups are symmetrically arranged on the rotor shaft 200 in the shaft body 102 on both sides of the disc body 101, and the rotor shaft 200 is synchronously adjusted by the two magnetic bearing groups to ensure that the rotor shaft 200 is always at the center line position of the shaft body 102, and there is no friction between the magnetic bearing group and the rotor shaft 200 during operation, which can effectively increase the rotation speed of the rotor shaft 200, so that the chopper provided in this embodiment can be suitable for high speed. Similarly, since the two magnetic bearing groups synchronously adjust the rotor shaft 200 to ensure that the rotor shaft 200 is always at the center line position of the shaft body 102, it can effectively avoid the chopper disc assembly installed on the rotor shaft 200 from vibrating during rotation.

[0038] According to an embodiment provided by the present invention, Figure 1 and Figure 4As shown, each magnetic bearing group includes two radial magnetic bearings 103 and two axial magnetic bearings 104. The two radial magnetic bearings 103 are spaced apart and sleeved on the rotor shaft 200. The power member 400 is disposed between the two radial magnetic bearings 103. The two axial magnetic bearings 104 are symmetrically disposed at the ends of the rotor shaft 200 and at the connection between the rotor shaft 200 and the chopper disk assembly.

[0039] In this embodiment, each magnetic bearing group includes two radial magnetic bearings 103 and two axial magnetic bearings 104. The radial magnetic bearing 103 includes a stator coil 110 and a rotor core 111. The rotor of the power component 400 and the rotor core 111 of the radial magnetic bearing 103 are both connected to the rotor shaft 200 and are synchronously driven by the power component 400. The two axial magnetic bearings 104 are symmetrically arranged at the ends of the rotor shaft 200 and at the connection between the rotor shaft 200 and the chopper disk assembly. The axial magnetic bearings 104 ensure the rotational connectivity between the rotor shaft 200 and the chopper disk assembly. The axial magnetic bearings 104 can ensure that the chopper disk assembly and the rotor shaft 200 are suitable for high-speed operation, thereby improving the overall service life of the high-speed neutron chopper.

[0040] Among them, preferably, the radial magnetic bearing 103 uses an electromagnetic bearing, the axial magnetic bearing 104 uses a permanent magnet bearing, and in combination with the permanent magnet bearing, the power part 400 uses a permanent magnet synchronous motor, and the rotor of the permanent magnet synchronous motor and the rotor core 111 of the electromagnetic bearing are both connected to the rotor shaft 200. Correspondingly, the radial magnetic bearing 103, the axial magnetic bearing 104 and the power part 400 can also be selected according to actual use requirements, and are not limited to the above-mentioned types. Their purpose does not deviate from the design concept of the present invention and should belong to the protection scope of the present invention.

[0041] According to an embodiment provided by the present invention, Figure 1 and Figure 4 As shown, an eddy current sensor 105 is provided on a side of each radial magnetic bearing 103 facing away from the power component 400 , and the eddy current sensor 105 is used to detect the position of the rotor shaft 200 .

[0042] In this embodiment, an eddy current sensor 105 is provided on the side of each radial magnetic bearing 103 facing away from the power part 400. In other words, an eddy current sensor 105 is installed on the outside of each radial magnetic bearing 103. The eddy current sensor 105 monitors the position of the rotor shaft 200 at all times so that the rotor shaft 200 can be adjusted to be at the center line position of the shaft body 102 at all times, thereby preventing the chopper disk assembly from vibrating due to the offset of the rotor shaft 200 when rotating, while ensuring the rotation speed of the rotor shaft 200.

[0043] According to an embodiment provided by the present invention, Figure 1 and Figure 4 As shown, the high-speed neutron chopper further includes a controller, which is electrically connected to each eddy current sensor 105 , the radial magnetic bearing 103 and the power member 400 .

[0044] In this embodiment, the position of the rotor shaft 200 is detected in real time by the eddy current sensor 105, and an electrical signal is generated and transmitted to the controller. After receiving the electrical signal, the controller identifies it. When it is determined that the rotor shaft 200 is offset, the controller sends an electrical signal to the radial magnetic bearing 103 to control the radial magnetic bearing 103 to adjust the position of the rotor shaft 200 so that the rotor shaft 200 is always at the set centerline position, that is, the centerline position of the shaft body 102.

[0045] Preferably, the radial magnetic bearing 103 adjusts the rotor shaft 200 in a manner where the positions of the four degrees of freedom, namely, up, down, left, and right, are detected and controlled by the eddy current sensor 105 .

[0046] According to an embodiment provided by the present invention, Figure 1 and Figure 4 As shown, protective bearings 106 are respectively provided at both ends of the rotor shaft 200 .

[0047] In this embodiment, protective bearings 106 are respectively provided at the ends of the rotor shaft 200. The provision of the protective bearings 106 can effectively prevent the radial magnetic bearing 103, the axial magnetic bearing 104 or the rotor of the power part 400 from being separated from the rotor shaft 200 due to excessively high rotation speed during operation, thus rendering them unusable.

[0048] Optionally, the protective bearing 106 is a ceramic ball bearing.

[0049] According to an embodiment provided by the present invention, Figure 1 and Figure 3 As shown, a pressure release device 107 is provided at the bottom of the disk body 101, and the pressure release device 107 is connected to the vacuum chamber.

[0050] In this embodiment, a pressure releaser 107 is provided at the bottom of the disk body 101, and an exhaust plate 112 is also provided on the base 108. The exhaust plate 112 is connected to the pressure releaser 107. The disk body 101 is installed on the base 108. The pressure releaser 107 will face the base 108. By providing the exhaust plate 112, a number of exhaust holes are evenly provided on the exhaust plate 112 to ensure that the pressure releaser 107 can release pressure when there is an instantaneous positive pressure in the vacuum chamber.

[0051] According to an embodiment provided by the present invention, Figure 1 and Figure 3As shown, one end of the pressure release device 107 connected to the vacuum chamber is provided with a negative pressure-resistant sheet.

[0052] In this embodiment, a negative pressure-resistant sheet is provided at one end of the pressure release device 107 that is connected to the vacuum chamber. Since the vacuum chamber will be under negative pressure when in use, the use of the negative pressure-resistant sheet can keep the pressure release device 107 in a closed state during normal use. When the chopper disk 300 is damaged due to centrifugal force, the instantaneous high temperature generated by the high-speed friction of the fragments or faulty parts of the chopper disk 300 will form an instantaneous positive pressure, which can break through the sheet to achieve rapid pressure release, avoid secondary disasters caused by the explosion, and achieve higher safety.

[0053] According to an embodiment provided by the present invention, Figure 1 and Figure 2 As shown, the chopper disk assembly includes two chopper disks 300 , and the two chopper disks 300 are installed on the rotor shaft 200 in parallel.

[0054] In this embodiment, the chopper disk assembly includes two chopper disks 300 , wherein preferably, the two chopper disks 300 are installed in parallel, and one chopper disk 300 corresponds to the shaft body 102 on one side, and is adjusted by the magnetic bearing group in the shaft body 102 .

[0055] The chopper disk 300 and the rotor shaft 200 are made of T700 carbon fiber impregnated with epoxy resin and are manufactured using a cross-ply method to increase the strength in the direction of centrifugal force. The rotor shaft 200 can be manufactured in a solid shape or a hollow shape.

[0056] Preferably, a slot-shaped photoelectric sensor is installed at the bottom of the inner side of the vacuum chamber to detect the rotation speed and phase angle of the chopper disk 300 .

[0057] According to an embodiment provided by the present invention, Figure 1 and Figure 4 As shown, a vacuum generator 500 is installed on the outer wall of the disk body 101, and the vacuum generator 500 is connected to the vacuum chamber.

[0058] In this embodiment, a vacuum generator 500 is installed on the outer wall of the tray body 101 , and the vacuum generator 500 is used to ensure that a vacuum cavity inside the tray body 101 can form a vacuum.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-speed neutron chopper, characterized in that: It comprises a housing (100), a rotor shaft (200), a chopper disk assembly, a magnetic suspension bearing assembly and a power part (400); The housing (100) comprises a disk body (101) and a shaft body (102); a vacuum chamber is formed inside the disk body (101) and the shaft body (102); the chopper disk assembly is arranged in the vacuum chamber; the shaft body (102) is symmetrically arranged on both sides of the disk body (101); the rotor shaft (200) is arranged inside the shaft body (102); the chopper disk assembly is mounted on the rotor shaft (200); and the chopper disk assembly can rotate synchronously with the rotor shaft (200); The magnetic suspension bearing assembly is symmetrically sleeved on the rotor shaft (200), and the magnetic suspension bearing assembly can ensure that the rotor shaft (200) is always located at the center line position of the shaft body (102); The output end of the power member (400) is connected to the rotor shaft (200), and the power member (400) is used to drive the rotor shaft (200) to rotate.

2. The high-speed neutron chopper according to claim 1, characterized in that: The magnetic suspension bearing assembly comprises two magnetic suspension bearing groups, and the two magnetic suspension bearing groups are symmetrically arranged on the rotor shaft (200) in the shaft body (102) on both sides of the disk body (101).

3. The high-speed neutron chopper according to claim 2, characterized in that: Each of the magnetic suspension bearing groups comprises two radial magnetic suspension bearings (103) and two axial magnetic suspension bearings (104); the two radial magnetic suspension bearings (103) are spaced apart and sleeved on the rotor shaft (200); the power member (400) is arranged between the two radial magnetic suspension bearings (103); and the two axial magnetic suspension bearings (104) are symmetrically arranged at the ends of the rotor shaft (200) and at the connection between the rotor shaft (200) and the chopper disk assembly.

4. The high-speed neutron chopper according to claim 3, characterized in that: An eddy current sensor (105) is provided on a side of each radial magnetic suspension bearing (103) facing away from the power component (400), and the eddy current sensor (105) is used to detect the position of the rotor shaft (200).

5. The high-speed neutron chopper according to claim 4, characterized in that: The high-speed neutron chopper also includes a controller, which is respectively connected to each of the eddy current sensors (105), the radial magnetic suspension bearing (103) and the power component (400).

6. The high-speed neutron chopper according to claim 4, characterized in that: Protection bearings (106) are also provided at both ends of the rotor shaft (200).

7. The high-speed neutron chopper according to claim 1, characterized in that: A pressure release device (107) is provided at the bottom of the disk body (101), and the pressure release device (107) is communicated with the vacuum chamber.

8. The high-speed neutron chopper according to claim 7, characterized in that: One end of the pressure release device (107) communicating with the vacuum chamber is provided with a negative pressure-resistant sheet.

9. The high-speed neutron chopper according to claim 1, characterized in that: The chopper disk assembly comprises two chopper disks (300), and the two chopper disks (300) are installed in parallel on the rotor shaft (200).

10. The high-speed neutron chopper according to any one of claims 1 to 9, characterized in that: A vacuum generator (500) is installed on the outer wall of the disk body (101), and the vacuum generator (500) is connected to the vacuum chamber.

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