Hyperboloid quadrupole rod device, system and manufacturing method thereof

Abstract

The invention provides a double-curved-surface quadrupole rod device, a double-curved-surface quadrupole rod system and a manufacturing method of the double-curved-surface quadrupole rod device. The double-curved-surface quadrupole rod device comprises at least one pole rod and a fixing structure. The fixing structure comprises a fixing seat, a positioning ball, a spring and a fastening screw; one part of one side of the outer surface of the pole rod is a hyperboloid, one part of the other side of the outer surface of the pole rod is a round surface, a pair of parallel planes are arranged between the hyperboloid and the planes, and the four planes jointly form the outer surface of the pole rod; the fixing base is of a three-dimensional columnar structure, the center of the fixing base is hollow, the pole rod is arranged in the fixing base, and the round face of the outer surface of the pole rod is matched with the inner surface of the fixing base. Through the design of the hyperboloid pole rod, a more ideal hyperboloid electric field can be generated, the influence of a high-order field is reduced, the trajectory offset of charged particles is avoided, and the resolution and sensitivity of the mass spectrometer are improved.

Description

Technical Field

[0001] The present application relates to the technical field of structural design of analytical testing instruments, and in particular to a hyperbolic quadrupole device, system and manufacturing method thereof. Background Art

[0002] In a quadrupole mass spectrometer, the four poles manipulate the movement of charged particles by applying a combination of alternating electric fields and direct current electric fields, thereby achieving mass separation of ions. Under ideal conditions, the four poles should be able to generate a hyperbolic electric field (hyperbolic electric field) that can accurately guide and separate ions of different mass-to-charge ratios.

[0003] Most existing quadrupole mass analyzers use cylindrical poles, mainly because this shape is easy to process. However, cylindrical poles will generate high-order fields during the electric field generation process, causing electric field distortion, thereby affecting the resolution and sensitivity of the mass spectrometer. The presence of high-order fields will cause the trajectory of charged particles to deviate from the ideal path, reducing the accuracy of the analysis.

[0004] Compared with cylindrical poles, hyperbolic poles can generate more ideal hyperbolic electric fields and avoid the generation of high-order fields, thereby improving the resolution and sensitivity of mass spectrometers. However, the processing accuracy of hyperbolic poles is very high, especially in terms of length, surface finish and positioning accuracy. The slow-wire precision wire cutting method commonly used in the prior art has some disadvantages, such as limited length, low surface finish, and high processing difficulty.

[0005] Currently, the industry is in urgent need of a hyperbolic quadrupole device that can improve the length, surface smoothness and positioning accuracy of the quadrupole to improve the performance of the mass spectrometer, especially in the application of high-precision mass spectrometry analysis.

[0006] The prior art with patent number CN118366844A discloses a differential quadrupole array and a mass spectrometer having the differential quadrupole array. The differential quadrupole array includes multiple groups of differential quadrupoles, each group of differential quadrupoles includes four metal plates extending on the radial plane of the differential quadrupole array and having the same contour line, and the four metal plates are arranged rotationally symmetrically in the radial plane, and the multiple groups of differential quadrupoles are arranged in sequence and aligned along the axial direction to form an ion transmission channel extending along the axial direction, wherein each group of differential quadrupoles is individually controlled by a digital drive circuit. The differential quadrupole array of the prior art and the mass spectrometer having the differential quadrupole array are easy to manufacture and can realize multiple functions in the same mass spectrometer, including ion acceleration / deceleration, ion convergence / divergence, ion selection, ion collision, linear ion trap and ion mobility separation, and the order of the above functions can be defined as needed. Summary of the invention

[0007] In view of the defects in the prior art, the purpose of the present application is to provide a hyperbolic quadrupole device, system and manufacturing method thereof.

[0008] A hyperbolic quadrupole device provided in the present application includes: at least one pole and a fixing structure;

[0009] The fixing structure comprises: a fixing seat, a positioning ball, a spring and a fastening screw;

[0010] One side of the outer surface of the pole is a hyperbolic surface, and the other side is a circular surface. A pair of mutually parallel planes are arranged between the hyperbolic surface and the plane. The four planes together constitute the outer surface of the pole;

[0011] The fixing seat is a three-dimensional columnar structure, the center of the fixing seat is hollow, the pole is arranged inside the fixing seat, and the circular surface of the outer surface of the pole matches the inner surface of the fixing seat;

[0012] One end of the spring contacts the outer surface of the pole, and the other end contacts the positioning ball.

[0013] The inner wall of the fixing seat is respectively provided with a spherical small groove and a circular large groove, the positioning ball cooperates with the spherical small groove, and the circular outer surface of the pole cooperates with the fixing seat through the circular large groove;

[0014] The fixing seat is connected to the pole via a fastening screw.

[0015] Preferably, the pole is made of molybdenum-rhenium alloy material, and the fixing seat and positioning ball are made of ceramic material.

[0016] Preferably, the vertex of the hyperboloid and the central axis of the pole form a pole central symmetry plane, and the pole threaded hole is arranged at the intersection of the pole central symmetry plane and the circular surface of the pole.

[0017] Preferably, the ceramic material is specifically 99 alumina ceramic.

[0018] Preferably, the diameter of the circular large groove is the same as the circular diameter of the outer surface of the pole.

[0019] Preferably, the positioning ball has micron-level accuracy.

[0020] The hyperbolic quadrupole device provided in the present application comprises four poles, each of which is arranged inside a fixing seat at an interval of 90 degrees.

[0021] Preferably, the centers of the inner circles of the relatively arranged spherical small groove, circular large groove and fixing seat are all collinear.

[0022] The present application also provides a method for manufacturing a hyperbolic quadrupole. The hyperbolic quadrupole device described above can be manufactured using the method, which includes the following steps:

[0023] Step 1: prepare a molybdenum-rhenium alloy bar stock, and process a through hole in the center of the bar stock, wherein the diameter of the through hole is approximately 1 / 3 to 2 / 5 of the outer diameter of the pole;

[0024] Step 2: Use grinding technology to process the rod material so that one side of the pole is circular and the other side is hyperbolic, and two parallel planes are processed between the circular surface and the hyperbolic surface;

[0025] Step 3: Prepare 99% alumina ceramic material, make a three-dimensional annular fixing seat, evenly process a number of large-diameter grooves on the inner ring of the fixing seat, and then further process small-diameter grooves on the basis of the already processed large-diameter grooves, the diameter of the large-diameter groove is the same as the circular diameter of the pole, and the diameter of the small-diameter groove is the same as the diameter of the positioning ball;

[0026] Step 4: machining a spherical positioning hole on the circular surface of each pole, wherein the diameter of the positioning hole is the same as the diameter of the positioning ball;

[0027] Step 5: Install the compression spring in the positioning hole, and install the prepared spring and positioning ball into the circular positioning hole of the pole in sequence;

[0028] Step 6: Assemble the pole equipped with the positioning ball and the spring onto the fixing seat;

[0029] Step 7: Use the machined fastening screws to securely fasten the pole to the mounting.

[0030] The present application also provides a hyperbolic quadrupole system, comprising the hyperbolic quadrupole device described above.

[0031] Compared with the prior art, this application has the following beneficial effects:

[0032] 1. The present application can generate a more ideal hyperbolic electric field through the design of the hyperbolic pole, reduce the influence of the high-order field, avoid the deviation of the trajectory of the charged particles, and improve the resolution and sensitivity of the mass spectrometer.

[0033] 2. This application uses precise positioning ceramic balls and ceramic fixing seats, and applies pressure through springs to ensure the relative position of the quadrupole rods is accurate, thus avoiding angle changes of the rods during use. The precise positioning system improves the stability of the electric field and ensures the consistency of instrument performance.

[0034] 3. The present application uses grinding technology to make the surface finish of the pole reach 0.4 microns. This not only improves the processing quality of the pole, but also greatly reduces the impact of surface roughness on the uniformity of the electric field, further improving the performance of the mass spectrometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0036] Figure 1 This application mainly embodies the schematic cross-sectional structure of a hyperbolic quadrupole device;

[0037] Figure 2 This application mainly embodies the right side schematic diagram of the hyperbolic quadrupole device.

[0038] 1. Pole; 2. Fixed seat; 3. Fastening screw; 4. Positioning ball; 5. Spring; 6. Small spherical groove; 7. Large circular groove; 8. Pole plane; 9. Pole center through hole. DETAILED DESCRIPTION

[0039] The present application is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present application. These all belong to the protection scope of the present application.

[0040] The hyperbolic quadrupole 1 device provided by the present application comprises: at least one pole 1 and a fixing structure; the fixing structure comprises: a fixing seat 2, a positioning ball 4, a spring 5 and a fastening screw 3; a part of one side of the outer surface of the pole 1 is a hyperbolic surface, and a part of the other side is a circular surface, and a pair of mutually parallel planes are arranged between the hyperbolic surface and the plane, and the four planes together constitute the outer surface of the pole 1;

[0041] The fixing seat 2 is a three-dimensional columnar structure, the center of the fixing seat 2 is hollow, the pole 1 is arranged inside the fixing seat 2, and the circular surface of the outer surface of the pole 1 cooperates with the inner surface of the fixing seat 2; one end of the spring 5 contacts the outer surface of the pole 1; the other end contacts the positioning ball 4; the inner wall of the fixing seat 2 is respectively provided with a spherical small groove 6 and a circular large groove 7, the positioning ball 4 cooperates with the spherical small groove 6, and the circular outer surface of the pole 1 cooperates with the fixing seat 2 through the circular large groove 7;

[0042] The fixing seat 2 is connected to the pole 1 through the fastening screw 3. The pole 1 is made of molybdenum-rhenium alloy material, and the fixing seat 2 and the positioning ball 4 are made of ceramic material. The vertex of the hyperboloid and the central axis of the pole 1 form the central symmetry plane of the pole 1, and the threaded hole of the pole 1 is set at the intersection of the central symmetry plane of the pole 1 and the circular surface of the pole 1.

[0043] The ceramic material is specifically 99 alumina ceramic. The diameter of the circular large groove 7 is the same as the circular diameter of the outer surface of the pole 1. The positioning ball 4 has micron-level accuracy.

[0044] The hyperbolic quadrupole 1 device provided in the present application comprises four poles 1, each of which is arranged at 90 degrees inside the fixing seat 2. The centers of the relatively arranged spherical small grooves 6, circular large grooves 7 and the inner circles of the fixing seat 2 are all collinear.

[0045] The present application also provides a method for manufacturing a hyperbolic quadrupole 1. The method for manufacturing a hyperbolic quadrupole 1 can be used to manufacture the hyperbolic quadrupole 1 device, which includes the following steps:

[0046] Step 1: prepare a molybdenum-rhenium alloy bar, and process a through hole in the center of the bar, the diameter of the through hole is about 1 / 3 to 2 / 5 of the outer diameter of the pole 1;

[0047] Step 2: Use grinding technology to process the rod material so that one side of the pole 1 is circular and the other side is hyperbolic, and two parallel planes are processed between the circular surface and the hyperbolic surface;

[0048] Step 3: Prepare 99% alumina ceramic material, make a three-dimensional annular fixing seat 2, evenly process a number of large-diameter grooves on the inner ring of the fixing seat 2, and then further process small-diameter grooves on the basis of the already processed large-diameter grooves, the diameter of the large-diameter groove is the same as the circular diameter of the pole 1, and the diameter of the small-diameter groove is the same as the diameter of the positioning ball 4;

[0049] Step 4: a spherical positioning hole is machined on the circular surface of each pole 1, and the diameter of the positioning hole is the same as the diameter of the positioning ball 4;

[0050] Step 5: Install the compression spring 5 in the positioning hole, and install the prepared spring 5 and positioning ball 4 into the circular positioning hole of the pole 1 in sequence;

[0051] Step 6: Assemble the pole 1 equipped with the positioning ball 4 and the spring 5 onto the fixing seat 2;

[0052] Step 7: Use the machined fastening screws 3 to securely fix the pole 1 to the fixing seat 2.

[0053] The present application also provides a hyperbolic quadrupole 1 system, comprising the hyperbolic quadrupole 1 device described above.

[0054] A feasible embodiment of the present application is provided below.

[0055] A hyperbolic quadrupole device comprises a pole 1, a fixing seat 2, a fastening screw 3, a positioning ball 4 and a spring 5.

[0056] There are 4 poles 1, each of which is exactly the same. The pole material is molybdenum-rhenium alloy, and the blank is a bar with a through hole 9 in the center. After processing, the pole 1 is circular on one side and hyperbolic on the other side, and the cross section of the pole is an axisymmetric structure, and the symmetry plane is the plane where the vertex of the hyperbolic surface and the center axis of the pole are located. There is also a pair of pole planes 8 between the circular surface and the hyperbolic surface of the pole 1, and each pole plane 8 is parallel to the pole symmetry plane. The pole plane 8 is used as the positioning reference during the grinding of the pole 1, and is also the positioning reference for the threaded hole and the positioning hole on the pole 1.

[0057] There are two fixing seats 2, each of which is exactly the same. The fixing seat 2 is a circular ring structure, and the material is 99 alumina ceramic. On the inner ring, four large diameter grooves 7 and four small diameter grooves 6 are evenly distributed at 90 degree intervals. The small diameter grooves 6, the large diameter grooves 7 and the center of the ceramic fixing seat 2 are all collinear. The diameter of the large diameter groove 7 is the same as the circular diameter of the pole 1, and is used to install the pole 1; the diameter of the small diameter groove 6 is the same as the diameter of the ceramic positioning ball 4, and is used to install the ceramic positioning ball 4.

[0058] The positioning ball 4 has micron-level accuracy and is installed in the circular positioning hole of the pole 1. A spring 5 is installed in the positioning hole to provide elastic force for the positioning ball 4 to fit the small diameter groove 6 on the fixing seat 2, thereby limiting the rotation angle of the pole 1 relative to the ceramic fixing seat 2.

[0059] The fastening screw 3 is a machined screw, the thread teeth of which have a higher precision level than that of ordinary screws, and form a precise meshing with the threaded hole of the pole 1 .

[0060] When assembling the hyperbolic quadrupole of the present invention, a spring 5 and a positioning ball 4 are installed on the pole 1, and the size of the spring 5 is controlled to provide sufficient ejection force for the positioning ball 4. The positioning ball 4 is pressed into the round hole of the pole 1, and then the pole 1 is assembled with the fixing seat 2, the positioning ball 4 slides into the small diameter groove 6 of the fixing seat 2, and the fastening screw 3 is screwed on to complete the assembly.

[0061] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0062] The above describes the specific embodiments of the present application. It should be understood that the present application is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the substantive content of the present application. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A hyperbolic quadrupole device, characterized in that: include: At least one pole (1) and a fixing structure; The fixing structure comprises: a fixing seat (2), a positioning ball (4), a spring (5) and a fastening screw (3); One side of the outer surface of the pole (1) is a hyperbolic surface, and the other side is a circular surface. A pair of mutually parallel planes are provided between the hyperbolic surface and the plane. The four planes together constitute the outer surface of the pole (1); The fixing seat (2) is a three-dimensional columnar structure, the center of the fixing seat (2) is hollow, the pole (1) is arranged inside the fixing seat (2), and the circular surface of the outer surface of the pole (1) matches the inner surface of the fixing seat (2); One end of the spring (5) contacts the outer surface of the pole (1); the other end contacts the positioning ball (4); The inner wall of the fixing seat (2) is respectively provided with a spherical small groove (6) and a circular large groove (7), the positioning ball (4) cooperates with the spherical small groove (6), and the circular outer surface of the pole (1) cooperates with the fixing seat (2) through the circular large groove (7); The fixing seat (2) is connected to the pole (1) via a fastening screw (3).

2. The hyperbolic quadrupole device according to claim 1, characterized in that: The pole (1) is made of a molybdenum-rhenium alloy material, and the fixing seat (2) and the positioning ball (4) are made of a ceramic material.

3. The hyperbolic quadrupole device according to claim 1, characterized in that: The apex of the hyperboloid and the central axis of the pole (1) form a central symmetry plane of the pole (1), and the threaded hole of the pole (1) is arranged at the intersection of the central symmetry plane of the pole (1) and the circular surface of the pole (1).

4. The hyperbolic quadrupole device according to claim 2, characterized in that: The ceramic material is specifically 99 alumina ceramic.

5. The hyperbolic quadrupole device according to claim 1, characterized in that: The diameter of the circular large groove (7) is the same as the circular diameter of the outer surface of the pole (1).

6. The hyperbolic quadrupole device according to claim 1, characterized in that: The positioning ball (4) has micron-level accuracy.

7. The hyperbolic quadrupole device according to claim 1, characterized in that: It comprises four poles (1), each of which is arranged inside a fixing seat (2) at an interval of 90 degrees.

8. The hyperbolic quadrupole device according to claim 7, characterized in that: The inner circles of the relatively arranged spherical small groove (6), the circular large groove (7) and the fixing seat (2) are all collinear in center.

9. A method for manufacturing a hyperbolic quadrupole, characterized in that: The method for manufacturing the hyperbolic quadrupole (1) can be used to manufacture a hyperbolic quadrupole device as claimed in any one of claims 1 to 8, comprising the following steps: Step 1: prepare a molybdenum-rhenium alloy rod, and process a through hole in the center of the rod, wherein the diameter of the through hole is approximately 1 / 3 to 2 / 5 of the outer diameter of the pole (1); Step 2: using a grinding process to process the rod material, so that one side of the pole (1) is circular and the other side is hyperbolic, and two mutually parallel planes are processed between the circular surface and the hyperbolic surface; Step 3: Prepare 99% alumina ceramic material, make a three-dimensional annular fixing seat (2), evenly process a plurality of large-diameter grooves on the inner ring of the fixing seat (2), and then further process small-diameter grooves on the basis of the already processed large-diameter grooves, wherein the diameter of the large-diameter groove is the same as the circular diameter of the pole (1), and the diameter of the small-diameter groove is the same as the diameter of the positioning ball (4); Step 4: machining a spherical positioning hole on the circular surface of each pole (1), wherein the diameter of the positioning hole is the same as the diameter of the positioning ball (4); Step 5: Install the compression spring (5) in the positioning hole, and install the prepared spring (5) and positioning ball (4) into the circular positioning hole of the pole (1) in sequence; Step 6: Assemble the pole (1) equipped with the positioning ball (4) and the spring (5) onto the fixing seat (2); Step 7: Use the machined fastening screws (3) to firmly fix the pole (1) to the fixing seat (2).

10. A hyperbolic quadrupole system, characterized in that: The invention comprises a hyperbolic quadrupole device as described in any one of claims 1 to 8.

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