An octagonal pole

Abstract

This utility model discloses an eight-pole electrode, belonging to the technical field of ion optical components for mass spectrometers. It includes eight poles and connecting brackets. The connecting brackets are located on both sides of the poles and are used to connect them. The connecting brackets include welding brackets, a middle bracket, and screws. Two welding brackets are connected to both sides of the middle bracket. The middle bracket has a circular ring structure. The welding bracket includes a base and a mounting base. The base has a circular ring structure and is connected to the middle bracket by screws. Four mounting platforms are evenly spaced along the circumferential direction on the inner side of the mounting base. Placement slots are provided on the mounting platforms, and the poles are placed in the placement slots and welded to the mounting platforms. The welding brackets on both sides of the middle bracket are staggered, each connecting four poles, ensuring that the eight poles are evenly spaced along the circumference of the middle bracket. This structure uses an integrally machined welding bracket with placement slots to limit the poles, replacing adhesive fixation and improving positioning accuracy and welding consistency.

Description

Technical Field

[0001] This invention belongs to the field of ion optical components technology for mass spectrometers, specifically an octupole. Background Technology

[0002] Octuple mass analyzers are core components of mass spectrometers used for ion transport and mass analysis, widely applied in inductively coupled plasma mass spectrometry (ICP-MS), triple quadrupole mass spectrometry (TQMS), and various cascade mass spectrometry systems. An octuple mass analyzer consists of eight parallel cylindrical poles evenly distributed circumferentially along a central axis. By applying a specific radio frequency voltage to the poles, a higher-order electric field (octuple field) is generated within the channel formed by the poles. This higher-order electric field radially confines and focuses ions, effectively reducing mass discrimination and achieving efficient ion capture and transport under relatively high operating pressures. Therefore, the manufacturing and assembly precision of the octuple directly determines the ion transport efficiency and analytical stability of the mass spectrometer. However, as a multi-pole system, the core performance of the octuple is highly dependent on the spatial positional accuracy of the eight poles, including circumferential uniformity, parallelism of each pole to the central axis, and coplanarity of the pole ends. Any deviation in the position of any pole will disrupt the symmetry of the electric field, leading to decreased ion transport efficiency and reduced mass resolution.

[0003] Existing octupole assembly processes generally suffer from poor positioning accuracy and difficulty in ensuring welding consistency. In current technologies, octupole assembly typically relies on manual alignment and pre-fixation with adhesive. This involves operators visually placing each of the eight poles into its corresponding position on a support frame using a simple clamp, then pre-fixing them with adhesive before welding. This manual alignment method has several insurmountable drawbacks: firstly, it lacks precise physical positioning mechanisms, and the angular position of the poles in the circumferential direction depends entirely on the operator's visual judgment, resulting in significant errors in the equal division of the eight poles, directly affecting the symmetry of the electric field; secondly, the adhesive pre-fixation process easily introduces additional offsets during dispensing. The surface tension of the adhesive causes uncontrollable micro-displacements in the poles, and the shrinkage during adhesive curing also causes positional drift, leading to a significant deviation between the actual and theoretical positions of the poles after pre-fixation. The aforementioned deviations, due to the lack of effective positioning constraints, further exacerbated the positional drift during subsequent welding processes, ultimately resulting in uneven circumferential distribution of the eight poles and inconsistent parallelism between each pole and the central axis. This severely restricted the performance indicators of the octupole quality analyzer and also led to poor product consistency and low yield during mass production.

[0004] To address the aforementioned technical problems, utility model patent CN220324407U discloses a multipole fixing assembly and analyzer device. This technical solution involves setting a multipole fixing base and a multipole upper pressure cover, with a first groove and a second groove respectively formed on the fixing base and the upper pressure cover. The two grooves together form a fixing groove, and a fixing sleeve is disposed within the fixing groove. The fixing base and the upper pressure cover are detachably connected via a connector. This technical solution, to a certain extent, achieves the detachability and consistency adjustment function of the multipole fixing assembly, solving the problems of inability to quickly disassemble and assemble the entire assembly and difficulty in consistency adjustment in existing positioning methods. However, this technical solution still has the following drawbacks: First, the final fixation of the pole still requires the application of clamping force through fasteners. During the fastening process, the pole may still experience slight displacement. The lack of a positioning structure for precise physical restraint of the pole before welding makes it difficult to guarantee positional accuracy during the pre-fixation stage. Second, in this solution, the pole and the fixing component still rely on the clamping force of the connector to maintain their relative position. The absence of a placement groove structure for precise pre-welding positioning of the pole makes it impossible to continuously constrain the pole's position during welding. During welding, the pole is prone to thermal deformation and displacement, causing the actual position of the pole after welding to deviate from the theoretical design position. Furthermore, the circumferential division and axial parallelism of each pole are insufficient to meet the requirements of high-precision mass spectrometry analysis. Therefore, there is an urgent need to provide an eight-pole structure that can precisely position the pole throughout the assembly and welding process, eliminates the need for adhesive pre-fixation, and has good detachability, in order to solve the problems of poor positioning accuracy and welding consistency in existing technologies. Utility Model Content

[0005] The purpose of this utility model is to provide an eight-pole lever to solve the following technical problems mentioned in the background art:

[0006] The current pole assembly relies on manual alignment and adhesive pre-fixation, resulting in poor positioning accuracy and welding consistency.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] An eight-pole rod includes poles and connecting brackets. Eight poles are provided, and connecting brackets are located on both sides of the poles for connecting them. Each connecting bracket includes a welding bracket, a middle bracket, and screws. Two welding brackets are connected to both sides of the middle bracket. The middle bracket is a circular ring structure. The welding bracket includes a base and a mounting base. The base is a circular ring structure and is connected to the middle bracket by screws. The mounting base is a ring structure, with four mounting platforms evenly spaced along the circumferential direction on its inner side. Each mounting platform has a placement groove, and the poles are placed in the placement grooves and welded to the mounting platforms. The welding brackets on both sides of the middle bracket are staggered, each connecting four poles and ensuring that the eight poles are evenly spaced along the circumference of the middle bracket.

[0009] Furthermore, the intermediate support is made of ceramic material.

[0010] Furthermore, a relief groove is provided on the outer side of the mounting base to accommodate screws.

[0011] Furthermore, a through groove is formed between the mounting platforms on the inner side of the mounting base, and the four pole rods connected to the welding bracket on one side pass through the through groove of the welding bracket on the other side.

[0012] Furthermore, the placement slot has an arc-shaped structure, and the curvature is adapted to the pole rod.

[0013] Furthermore, a connector is provided on one side of the mounting base for connecting electrode leads.

[0014] Furthermore, the pole is a cylindrical metal rod.

[0015] Furthermore, the outer edge of the intermediate support is chamfered.

[0016] Furthermore, the depth of the placement groove is less than the radius of the pole, and the depth of the placement groove is greater than half the radius of the pole.

[0017] Furthermore, after the pole is welded to the mounting platform, the end face of the pole is higher than the end face of the mounting base.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This utility model integrates a welding bracket with a placement groove and limit rod, replacing manual alignment and adhesive fixing, thus improving positioning accuracy and welding consistency.

[0020] The pole is welded and fixed, which ensures a reliable connection, high temperature resistance, and avoids the risks of colloid aging and vacuum release.

[0021] The bracket adopts a screw assembly structure, which is convenient for disassembly and maintenance. The pole can be replaced individually, reducing maintenance costs. Attached Figure Description

[0022] Figure 1 This is a front view schematic diagram of the present utility model;

[0023] Figure 2 This is an exploded view of the present invention;

[0024] Figure 3 This is a schematic diagram of the welding bracket structure of this utility model.

[0025] The markings in the diagram are: 1-welding bracket, 2-intermediate bracket, 3-pole rod, 4-connector, 5-screw, 6-base, 7-mounting seat, 8-placement slot, 9-mounting platform, 10-through slot, 11-giveaway slot. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example:

[0028] An octagonal lever, such as Figure 1 As shown, it includes poles 3 and connecting brackets. Eight poles 3 are provided, and the connecting brackets are located on both sides of the poles 3 and are used to connect the poles 3; as shown... Figure 2 As shown, the connecting bracket includes a welding bracket 1, an intermediate bracket 2, and screws 5; the two welding brackets 1 are connected to both sides of the intermediate bracket 2; wherein, the intermediate bracket 2 is a circular ring structure; the welding bracket 1 includes a base 6 and a mounting base 7, the base 6 is a circular ring structure, and the base 6 is connected to the intermediate bracket 2 by screws 5; the mounting base 7 is a ring structure, and four mounting platforms 9 are evenly spaced along the circumferential direction on the inner side of the mounting base 7, and a placement groove 8 is provided on the mounting platform 9, and the pole rod 3 is placed on the placement groove 8 and welded to the mounting platform 9; the welding brackets 1 on both sides of the intermediate bracket 2 are staggered, and the welding brackets 1 on both sides are respectively connected to four pole rods 3, so that the eight pole rods 3 are evenly spaced along the circumference of the intermediate bracket 2.

[0029] The system comprises eight poles 3, forming a multi-pole electric field channel. Connecting brackets are positioned on both sides of the poles 3 to fix them and maintain their relative positions. The connecting brackets include a welding bracket 1, an intermediate bracket 2, and screws 5. The intermediate bracket 2 is a circular ring structure, serving as the mounting base for the welding brackets 1 on both sides. The welding bracket 1 consists of a base 6 and a mounting seat 7. The base 6 is a circular ring structure, detachably connected to the intermediate bracket 2 by screws 5. Using screws 5 instead of the original adhesive fixing method ensures connection strength while facilitating assembly and maintenance. The mounting seat 7 is a ring-shaped structure with four mounting platforms 9 evenly spaced circumferentially on its inner side. Each mounting platform 9 has a placement groove 8. The poles 3 are placed in the placement groove 8 and welded to the mounting platform 9. The placement groove 8 positions the poles 3 during welding, preventing them from shifting. The welding brackets 1 on both sides of the intermediate bracket 2 are staggered in the circumferential direction, so that the pole rods 3 corresponding to the four mounting platforms 9 on each side are alternated in the circumferential direction, and finally the eight pole rods 3 are evenly distributed along the circumferential direction of the intermediate bracket 2, which satisfies the symmetry requirements of the multi-pole system.

[0030] By directly machining placement grooves 8 into the mounting platform 9 of the welding bracket 1, the pole rods 3 are physically positioned, replacing manual alignment or adhesive pre-fixation, significantly improving the circumferential positioning accuracy and welding consistency of the pole rods 3. The pole rods 3 and mounting platform 9 are connected by welding, resulting in high connection strength and good temperature resistance, avoiding performance risks caused by adhesive aging or venting. The two side welding brackets 1 are connected to the middle bracket 2 by screws 5, rather than being integrally molded or permanently bonded, facilitating disassembly, replacement of pole rods 3, or maintenance, reducing maintenance costs. The staggered arrangement of the two side welding brackets 1, combined with the annular structure of the middle bracket 2, allows the eight pole rods 3 to naturally form a uniform circumferential distribution, eliminating the need for additional complex positioning structures and simplifying the overall design.

[0031] In a preferred embodiment, the intermediate support 2 is made of ceramic material. The high insulation of ceramic prevents electrical short circuits between the eight poles 3. At the same time, ceramic has good high temperature resistance and extremely low vacuum outgassing rate, making it suitable for mass spectrometry analysis systems in high vacuum environments. In addition, the high hardness and dimensional stability of ceramic ensure that the intermediate support 2 does not creep or deform during screw fastening and long-term use, thereby maintaining the misalignment and positioning accuracy of the welded supports 1 on both sides.

[0032] In a preferred embodiment, such as Figure 3 As shown, a clearance groove 11 is provided on the outer side of the mounting base 7, which is used to accommodate the screw 5. The clearance groove 11 is provided on the outer side of the mounting base 7 to accommodate the screw 5 connecting the base 6 and the intermediate bracket 2. Its function is to provide clearance space for the head of the screw 5 without increasing the overall radial dimension, so as to avoid interference between the screw 5 and adjacent parts or the inner wall of the cavity, and at the same time facilitate the tightening operation using tools.

[0033] In a preferred embodiment, such as Figure 3 As shown, a through groove 10 is formed between the mounting platforms 9 on the inner side of the mounting base 7. The four pole rods 3 connected to the welding bracket 1 on one side pass through the through groove 10 of the welding bracket 1 on the other side. The through groove 10 is set between adjacent mounting platforms 9 on the inner side of the mounting base 7. Its function is to provide a through channel for the pole rods 3 on the welding bracket 1 on the other side, so that the four pole rods 3 on one side can pass through the mounting base 7 of the welding bracket 1 on the opposite side without interference. This achieves that after the welding brackets 1 on both sides are staggered and assembled, the eight pole rods 3 are evenly distributed in the circumferential direction, avoiding collision or obstruction between the pole rods 3 and the mounting base 7.

[0034] In a preferred embodiment, the placement groove 8 has an arc-shaped structure, the curvature of which matches that of the pole rod 3. The purpose of this design is to radially limit the pole rod 3 before welding, increase the contact area to reduce positioning stress, and at the same time ensure the parallelism between the axis of the pole rod 3 and the reference plane of the mounting platform 9, thereby improving the positional accuracy and consistency of the pole rod 3 after welding.

[0035] In a preferred embodiment, a connector 4 is provided on one side of the mounting base 7 for connecting electrode leads. The function of the electrode leads is to reliably introduce the voltage signal of the external power supply to the electrode rod 3, avoiding stress concentration or solder joint detachment caused by directly welding the leads to the mounting base 7 body, and facilitating disassembly and maintenance.

[0036] In a preferred embodiment, the pole 3 is a cylindrical metal pole. The cylindrical metal pole is easy to machine with precision to control diameter tolerance and surface finish, which is beneficial for forming a uniform radial electric field distribution. At the same time, the metal material has good conductivity, which can reliably apply radio frequency voltage and reduce transmission loss.

[0037] In a preferred embodiment, the outer edge of the intermediate bracket 2 is chamfered. The chamfer serves to eliminate sharp edges to reduce the risk of scratches during assembly or maintenance, while also preventing stress concentration, improving the impact resistance of the ceramic material, and facilitating the smooth insertion of the bracket into the mounting slot of the vacuum chamber.

[0038] In a preferred embodiment, the depth of the placement groove 8 is less than the radius of the pole rod 3, and the depth of the placement groove 8 is greater than half the radius of the pole rod 3. This design provides a sufficiently deep groove for radial restraint of the pole rod 3 to prevent tipping, while more than half of the pole rod 3 is exposed outside the groove, facilitating welding tool operation and solder filling, thus achieving a balance between positioning stability and welding process convenience.

[0039] In a preferred embodiment, after the pole 3 is welded to the mounting base 9, the end face of the pole 3 is higher than the end face of the mounting base 7. This design ensures that the effective electric field area of ​​the pole 3 is not obstructed by the end face of the mounting base 7, while providing sufficient operating space for subsequent connection with electrode leads or contact with external circuits, avoiding poor contact or signal interference caused by flush or recessed end faces.

[0040] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An octagonal lever, characterized in that: The system includes poles (3) and connecting brackets. There are eight poles (3). The connecting brackets are set on both sides of the poles (3) and are used to connect the poles (3). The connecting brackets include welding brackets (1), intermediate brackets (2) and screws (5). The welding brackets (1) are connected to both sides of the intermediate brackets (2). The intermediate brackets (2) are circular ring structures. The welding brackets (1) include a base (6) and a mounting base (7). The base (6) is a circular ring structure. The base (6) is connected to the intermediate brackets (2) by screws (5). The mounting base (7) is a ring structure. Four mounting platforms (9) are evenly spaced along the circumferential direction on the inner side of the mounting base (7). The mounting platforms (9) are provided with placement grooves (8). The poles (3) are placed on the placement grooves (8) and welded to the mounting platforms (9). The welding brackets (1) on both sides of the intermediate brackets (2) are staggered. The welding brackets (1) on both sides are connected to four poles (3) respectively, so that the eight poles (3) are evenly spaced along the circumference of the intermediate brackets (2).

2. An eight-pole rod according to claim 1, characterized in that: The intermediate support (2) is made of ceramic material.

3. An eight-pole rod according to claim 1, characterized in that: The mounting base (7) has a relief groove (11) on its outer side, which is used to accommodate screws (5).

4. An eight-pole rod according to claim 1, characterized in that: A through groove (10) is formed between the mounting platform (9) inside the mounting base (7), and the four pole rods (3) connected to the welding bracket (1) on one side pass through the through groove (10) of the welding bracket (1) on the other side.

5. An eight-pole rod according to claim 1, characterized in that: The placement slot (8) has an arc-shaped structure, and the curvature is adapted to the pole (3).

6. An eight-pole rod according to claim 1, characterized in that: A connector (4) is provided on one side of the mounting base (7), which is used to connect the electrode lead wire.

7. An eight-pole rod according to claim 1, characterized in that: The pole (3) is a cylindrical metal rod.

8. An eight-pole rod according to claim 1, characterized in that: The outer edge of the intermediate support (2) is chamfered.

9. An eight-pole rod according to claim 1, characterized in that: The depth of the placement groove (8) is less than the radius of the pole (3), and the depth of the placement groove (8) is greater than half the radius of the pole (3).

10. An eight-pole rod according to claim 1, characterized in that: After the pole (3) is welded to the mounting base (9), the end face of the pole (3) is higher than the end face of the mounting base (7).

Images