Electrostatic field orbitrap and mass spectrometer with same

Abstract

The invention discloses an electrostatic field orbitrap and a mass spectrometer with the same, and the orbitrap comprises an inner electrode, two ends of which are respectively provided with a first thread part and a second thread part; the first external electrode assembly comprises a first external electrode and a first ceramic joint which are of an integrated structure; the second external electrode assembly comprises a second external electrode and a second ceramic joint which are of an integrated structure; positioning the substrate; the middle part of the inner electrode is accommodated in a cavity formed by oppositely buckling the first outer electrode and the second outer electrode; the first threaded part sequentially penetrates through the first outer electrode assembly and the positioning substrate and is in threaded connection with the first nut; the second threaded portion passes through the second external electrode assembly and is in threaded connection with the second nut. The ceramic-metal sealing technology is utilized to seal the outer electrode and the ceramic joint into an integrated structure, the axial / radial tolerance is eliminated or reduced through precision machining, the axial and radial assembly errors do not need to be considered manually in the assembly process, the assembly difficulty is simplified, and the overall precision is improved.

Description

Technical Field

[0001] The present invention relates to the field of analytical instruments, and in particular to an electrostatic field orbital trap and a mass spectrometer having the same. Background Art

[0002] Orbitrap is a high-resolution ion trap mass analyzer. It is a device that uses electrostatic fields to capture and analyze ions. In mass spectrometry, its main function is to accurately determine the mass-to-charge ratio (m / z) of ions, thereby studying the molecular composition and structure of substances.

[0003] The structure of the orbital trap is relatively complex and delicate. It is mainly composed of an outer electrode, an inner electrode, and a detection electrode. The outer electrode and the inner electrode are usually concentric cylindrical structures, which can generate a suitable electrostatic field to capture and confine ions.

[0004] The orbital trap has high sensitivity and can detect the presence of ions at low ion signal levels even when the sample amount is small.

[0005] The assembly accuracy of the orbital trap electrodes will have a great impact on the sensitivity of the orbital trap. Figure 1 As shown, from left to right, it is a left ceramic joint-left outer electrode-right outer electrode-right ceramic joint, which is coaxially assembled with the inner electrode, and the orbital trap is fixed on the substrate by a fixing nut and a radial positioning member 700. When the tolerance between the radial assembly length and the assembly requirement is too large, a quartz ring 600 can be added between the two outer electrodes to compensate.

[0006] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present application. It does not necessarily belong to the prior art of the present application, nor does it necessarily provide technical guidance. In the absence of clear evidence that the above content has been disclosed before the filing date of the present application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0007] The purpose of the present invention is to provide a track trap which reduces the number of assembly parts, reduces the difficulty of assembly, and improves the overall accuracy.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows: An electrostatic field orbital trap, comprising: An inner electrode, having a first threaded portion and a second threaded portion at both ends thereof; A first outer electrode assembly, comprising a first outer electrode and a first ceramic joint of an integral structure, and having a first through hole matched with the first threaded portion; A second outer electrode assembly, comprising a second outer electrode of an integral structure and a second ceramic joint, having a second through hole matched with the second threaded portion; A positioning substrate, which is planar and has a third through hole that matches the first threaded portion; The middle portion of the inner electrode is accommodated in a cavity formed by the relative buckling of the first outer electrode and the second outer electrode; The first threaded portion passes through the first through hole and the third through hole in sequence and is threadedly connected to the first nut; the second threaded portion passes through the second through hole and is threadedly connected to the second nut; and the end face of the first ceramic joint abuts against a side plane of the positioning substrate, the end face of the first nut abuts against the other side plane of the positioning substrate, and the end face of the second nut abuts against an end face of the second ceramic joint.

[0009] Further, based on any one of the technical solutions or a combination of multiple technical solutions described above, the first external electrode and the first ceramic joint are sealed as an integral component through an active metal brazing process, and the second external electrode and the second ceramic joint are sealed as an integral component through an active metal brazing process.

[0010] Further, based on any one of the above technical solutions or a combination of multiple technical solutions, the first outer electrode assembly and / or the second outer electrode assembly is obtained by processing in the following manner: A metallization layer is formed on the surface of the ceramic joint by a Mo-Mn method and then sintered; A brazing material foil is placed between the outer electrode and the sintered ceramic joint, and the outer electrode and the ceramic joint are coaxially clamped together; The coaxially clamped outer electrode and the ceramic joint are placed in a vacuum of no more than 5×10 -3 Pa, the temperature is within the range of 850±10℃, and the brazing sealing is completed; The sealing body is subjected to CNC grinding so that the tolerance of the axial length of the outer electrode and the ceramic joint is controlled to ±0.005 mm, thereby obtaining an outer electrode assembly.

[0011] Further, based on any one of the above technical solutions or a combination of multiple technical solutions, the ceramic joint is a high-alumina ceramic, the thickness of the metallized layer on its surface ranges from 20 μm to 50 μm, and the sintering temperature is between 1300° C. and 1500° C.; The solder foil is an Ag-Cu-Ti foil with a thickness of 0.1±0.02 mm, and the proportion of Ti is less than 3%. The clamping coaxiality tolerance of the outer electrode and the ceramic joint is less than or equal to 0.03 mm; The CNC grinding process ensures that the coaxiality tolerance between the outer electrode and the ceramic joint does not exceed 0.005 mm.

[0012] Further, based on any one of the above technical solutions or a combination of multiple technical solutions, the inner electrode includes an electrode body and a first extension piece and a second extension piece located at two ends of the electrode body, the first extension piece, the electrode body and the second extension piece are an integrated structure, and the axes of the three coincide; The first threaded portion is disposed on the first extension member, and the second threaded portion is disposed on the second extension member; The tolerance between the first extension piece and the first through hole is less than 0.05 mm, and the tolerance between the second extension piece and the second through hole is less than 0.05 mm.

[0013] Further, based on any one of the above technical solutions or a combination of multiple technical solutions, the first extension member is further provided with a first limiting portion, and the second extension member is further provided with a second limiting portion; The first limiting portion abuts against the inner wall of the first outer electrode or the first ceramic joint, and the second limiting portion abuts against the inner wall of the second outer electrode or the second ceramic joint.

[0014] Further, based on any one of the above technical solutions or a combination of multiple technical solutions, the first extension member and the first outer electrode assembly are provided with mutually matching locking structures to prevent the inner electrode from rotating relative to the first outer electrode assembly; And / or, the second extension member and the second outer electrode assembly are provided with mutually matching locking structures to prevent the inner electrode from rotating relative to the second outer electrode assembly.

[0015] Further, based on any one of the above-mentioned technical solutions or a combination of multiple technical solutions, the inner electrode is a stainless steel mallet-shaped electrode, and the electrode body has a structure in which the outer diameter narrows from the middle to both sides; The coaxiality tolerance of the first extension member and the second extension member is less than or equal to 0.03 mm.

[0016] Further, based on any one of the above technical solutions or a combination of multiple technical solutions, five six-divided points on the virtual axis of the electrode body of the inner electrode are defined as a first position, a second position, a third position, a fourth position and a fifth position, wherein the third position is the center point of the electrode body; The outer diameter of the inner electrode at the third position is 40% to 45% of the inner diameter of the outer electrode at that position; The outer diameter of the inner electrode at the second position and the fourth position is 50% to 55% of the inner diameter of the outer electrode at that position; The outer diameter of the inner electrode at the first position and the fifth position is 54% to 60% of the inner diameter of the outer electrode at that position.

[0017] Further, based on any one of the technical solutions or a combination of multiple technical solutions mentioned above, no ceramic ring or quartz ring is provided between the first outer electrode of the first outer electrode assembly and the second outer electrode of the second outer electrode assembly.

[0018] Further, based on any one of the technical solutions or a combination of multiple technical solutions mentioned above, the orbital trap is not provided with a positioning component in a direction intersecting with the axial direction of the inner electrode.

[0019] According to another aspect of the present invention, the present invention provides a mass spectrometer, comprising the electrostatic field orbital trap as described above.

[0020] The beneficial effects brought by the technical solution provided by the present invention are as follows: a. Fewer assembly parts simplify assembly difficulty and improve assembly efficiency; b. The outer electrode and the ceramic joint are sealed into an integrated structure using a ceramic-metal sealing process, and the axial tolerance and radial tolerance are eliminated or reduced through precision machining; c. Combined with the precise control of the coaxiality of both ends of the inner electrode, the axial and radial assembly errors do not need to be considered manually during the assembly process, and there is no need to use ceramic rings or quartz rings to control the gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the assembly of an orbital trap in the prior art; Figure 2 A schematic diagram of the assembly of an orbital trap provided by an exemplary embodiment of the present invention at a first viewing angle; Figure 3 for Figure 2 Schematic diagram of the corresponding explosion structure of the orbital trap; Figure 4 A schematic diagram of the assembly of an orbital trap provided by an exemplary embodiment of the present invention at a first viewing angle; Figure 5 for Figure 4 Schematic diagram of the corresponding explosion structure of the orbital trap; Figure 6 A front view of an orbital trap provided for an exemplary embodiment of the present invention; Figure 7 for Figure 6 A cross-sectional view of the corresponding orbital trap; Figure 8 for Figure 6 Schematic diagram of the corresponding explosion structure of the orbital trap; Fig. 9 for Figure 8 Cross-sectional view of the corresponding orbital trap.

[0023] Among them, the figure marks include: 100-inner electrode, 110-first threaded portion, 120-second threaded portion, 130-first extension piece, 140-second extension piece, 150-electrode body, 170-second limiting portion, 210-first outer electrode, 220-second outer electrode, 310-first ceramic joint, 320-second ceramic joint, 400-positioning substrate, 510-first nut, 520-second nut, 600-quartz ring, 700-radial positioning piece. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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 should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0026] In one embodiment of the present invention, an electrostatic field orbital trap is provided, such as Figure 3 , Figure 5 , Figures 7 to 9 As shown, the orbital trap includes: The inner electrode 100 has a first threaded portion 110 and a second threaded portion 120 at both ends thereof; A first outer electrode assembly, comprising a first outer electrode 210 and a first ceramic joint 310 of an integral structure, and having a first through hole matched with the first threaded portion 110; A second outer electrode assembly, comprising a second outer electrode 220 and a second ceramic joint 320 of an integral structure, and having a second through hole matched with the second threaded portion 120; A positioning substrate 400, which is planar and has a third through hole that matches the first threaded portion 110; The middle portion of the inner electrode 100 is accommodated in a cavity formed by the first outer electrode 210 and the second outer electrode 220 being buckled relative to each other; The first threaded portion 110 passes through the first through hole and the third through hole in sequence and is threadedly connected to the first nut 510; the second threaded portion 120 passes through the second through hole and is threadedly connected to the second nut 520; and the end face of the first ceramic joint 310 abuts against a side plane of the positioning substrate 400, the end face of the first nut 510 abuts against the other side plane of the positioning substrate 400, and the end face of the second nut 520 abuts against the end face of the second ceramic joint 320.

[0027] An important concept of the embodiment of the present invention is to seal the first outer electrode 210 and the first ceramic joint 310 as an integral component through an active metal brazing process, and to seal the second outer electrode 220 and the second ceramic joint 320 as an integral component through an active metal brazing process, and to perform precision machining in axial direction and coaxiality, so that the axial tolerance and coaxiality tolerance of the outer electrode assembly sealed as an integral structure are controlled within a strict range; at the same time, the inner electrode 100 is precisely machined to control its overall coaxiality tolerance within a very small range; in this way, during the assembly of the outer electrode assembly and the inner electrode 100, the assembler does not need to consider the axial tolerance and coaxiality tolerance, and the assembly operation is simplified to passing the two ends of the inner electrode 100 through the two outer electrode assemblies respectively, and then fixing them at both ends with nuts.

[0028] In a specific embodiment of the present invention, the first outer electrode assembly and / or the second outer electrode assembly is obtained by processing in the following manner: The first step is to form a metallization layer on the surface of the ceramic joint by the Mo-Mn method, preferably with a thickness range of 20μm to 50μm, and sinter at a high temperature in the temperature range of 1300℃-1500℃ to achieve chemical bonding between the W / Mo layer and the ceramic: the Mo (molybdenum) particles are bonded to the glass phase (SiO 2 , CaO, etc.) react to form a chemical bond. In this embodiment, the ceramic joint material can be a high-alumina ceramic (such as 99% alumina), which has a high bonding strength with Mo-Mn.

[0029] The second step is to place a brazing foil between the outer electrode and the sintered ceramic joint. It is preferred to use an Ag-Cu-Ti foil with a thickness of 0.1±0.02mm and a Ti content of less than 3%, such as an Ag72Cu28Ti1 (wt.%) foil. Use a graphite clamp to coaxially clamp the outer electrode and the ceramic joint together to ensure that the coaxiality tolerance of the clamping is less than or equal to 0.03mm. Ag72Cu28 is a eutectic composition with excellent liquid phase fluidity, which can fill the gaps in complex interfaces. The active elements Ti and Al 2 O 3 The reaction generates TiO / Ti 3 Al reduces the interface energy; strictly control the proportion of Ti to less than 3% to avoid the formation of brittle Ti-Cu intermetallic compounds; foil with a thickness of about 0.1mm can avoid the formation of residual stress and cracks, while reducing the use of precious metals and reducing material costs.

[0030] Step 3: Place the coaxially clamped outer electrode and the ceramic joint in a vacuum no greater than 5×10 -3 The brazing sealing is completed in an environment with a temperature of 850±10℃ and a heat preservation period of about 10 minutes. The Mo layer serves as an intermediate transition layer and has a gradient transition of thermal expansion coefficient with the stainless steel outer electrode to relieve the interfacial thermal stress. The metallization layer with a thickness of 20μm to 50μm allows the solder to fully spread on the surface of the metallization layer. The metallization layer of this thickness can provide sufficient roughness and active surface to promote the flow of the solder, while also avoiding the introduction of residual stress due to excessive thickness of the metallization layer.

[0031] The fourth step is to perform CNC grinding on the sealing body so that the tolerance of the axial length of the outer electrode and the ceramic joint is controlled to ±0.005 mm, and the coaxiality tolerance does not exceed 0.005 mm, thereby obtaining an outer electrode assembly.

[0032] like Figures 7 to 9 As shown, the inner electrode 100 includes an electrode body 150 and a first extension piece 130 and a second extension piece 140 located at both ends of the electrode body. The first extension piece 130, the electrode body 150 and the second extension piece 140 are an integrated structure, and the axes of the three coincide. The coincidence mentioned here means roughly coincidence, and the standard is that the coaxiality tolerance of the first extension piece 130, the electrode body 150 and the second extension piece 140 is less than or equal to 0.03mm; The first threaded portion 110 is arranged on the first extension member 130, and the second threaded portion 120 is arranged on the second extension member 140; the tolerance between the first extension member 130 and the first through hole is less than 0.05mm, and the tolerance between the second extension member 140 and the second through hole is less than 0.05mm, so that when the first extension member 130 is located in the first through hole and the second extension member 140 is located in the second through hole, the radial offset of the inner electrode 100 relative to the outer electrode assembly is less than 0.05mm.

[0033] In one embodiment, the second extension member 140 is further provided with a second limiting portion 170, that is, the second threaded portion 120 has an extreme position passing through the second through hole, and this extreme position is determined by the second limiting portion 170. In the assembled state, the second nut 520 is locked with the second threaded portion 120, and at this time, the second limiting portion 170 is against the inner wall of the second external electrode 220 or the second ceramic joint 320; although not shown in the figure, it can be understood that the first limiting portion can also be set on the first extension member 130, and the first threaded portion 110 has an extreme position passing through the first through hole, which is determined by the first limiting portion. In the assembled state, the first nut 510 is locked with the first threaded portion 110, and at this time, the first limiting portion is against the inner wall of the first external electrode 210 or the first ceramic joint 310.

[0034] In addition to providing a limiting portion to prevent axial movement between the inner electrode 100 and the outer electrode assembly, the present embodiment also provides a structure for preventing the inner electrode 100 and the outer electrode assembly from rotating around the axis: the first extension member 130 and the first outer electrode assembly are provided with a mutually cooperating locking structure to prevent the inner electrode 100 from rotating relative to the first outer electrode assembly; or, the second extension member 140 and the second outer electrode assembly are provided with a mutually cooperating locking structure to prevent the inner electrode 100 from rotating relative to the second outer electrode assembly.

[0035] In the above embodiments, the inner electrode 100 is a stainless steel mallet-shaped electrode, and the electrode body 150 has a structure in which the outer diameter narrows from the middle to both sides; Figure 7For example, five six-equal points on the virtual axis of the electrode body 150 of the inner electrode 100 are defined as the first position, the second position, the third position, the fourth position and the fifth position, wherein the third position is the center point of the electrode body 150; in this embodiment, the outer diameter of the inner electrode at the third position is 40% to 45% of the inner diameter of the outer electrode at that position; the outer diameter of the inner electrode at the second position and the fourth position is 50% to 55% of the inner diameter of the outer electrode at that position; the outer diameter of the inner electrode at the first position and the fifth position is 54% to 60% of the inner diameter of the outer electrode at that position. In other words, the position with the largest inner diameter of the outer electrode has the largest distance from the inner electrode 100, and the position with the smallest inner diameter of the outer electrode has the smallest distance from the inner electrode 100, and the corresponding inner diameter of the outer electrode narrows rapidly from the second position to the first position, which is reflected in the definition Figure 7 The gap value between the inner wall surface of the outer electrode and the outer wall of the inner electrode corresponding to the first position in the cross-section is gap1, the gap value between the inner wall surface of the outer electrode and the outer wall of the inner electrode corresponding to the second position is defined as gap2, and the gap value between the inner wall surface of the outer electrode and the outer wall of the inner electrode corresponding to the third position is defined as gap3, then gap1: gap2<gap2: gap3; similarly, from the fourth position toward the fifth position, the corresponding inner diameter of the outer electrode narrows rapidly.

[0036] Compared to Figure 1 , in this embodiment, Figures 2 to 8 In the orbital trap shown in FIG. 1 , no ceramic ring or quartz ring is provided between the first outer electrode 210 of the first outer electrode assembly and the second outer electrode 220 of the second outer electrode assembly, because the integrated structure of the outer electrode and the ceramic joint can greatly reduce the axial tolerance. Figure 1 A radial positioning piece 700 is provided in the middle orbital trap. The orbital trap in this embodiment is not provided with a positioning component in a direction intersecting with the axial direction of the inner electrode 100, because the coaxiality of the inner electrode combined with the coaxiality of the integrated structure of the outer electrode and the ceramic joint can ensure that the assembled orbital trap has a qualified radial tolerance without the need for radial positioning pieces.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An electrostatic field orbital trap, characterized in that: include: An inner electrode (100) having a first threaded portion (110) and a second threaded portion (120) respectively disposed at two ends thereof; A first outer electrode assembly comprising a first outer electrode (210) and a first ceramic joint (310) of an integral structure, the first outer electrode assembly having a first through hole matched with the first threaded portion (110); A second outer electrode assembly, comprising a second outer electrode (220) and a second ceramic joint (320) of an integral structure, and having a second through hole that matches the second threaded portion (120); A positioning substrate (400) which is planar and has a third through hole that cooperates with the first threaded portion (110); The middle portion of the inner electrode (100) is accommodated in a cavity formed by the relative buckling of the first outer electrode (210) and the second outer electrode (220); The first threaded portion (110) passes through the first through hole and the third through hole in sequence and is threadedly connected to the first nut (510); the second threaded portion (120) passes through the second through hole and is threadedly connected to the second nut (520); and the end face of the first ceramic joint (310) abuts against a plane on one side of the positioning substrate (400), the end face of the first nut (510) abuts against a plane on the other side of the positioning substrate (400), and the end face of the second nut (520) abuts against an end face of the second ceramic joint (320).

2. The electrostatic field orbital trap according to claim 1, characterized in that: The first external electrode (210) and the first ceramic joint (310) are sealed as an integral component by an active metal brazing process, and the second external electrode (220) and the second ceramic joint (320) are sealed as an integral component by an active metal brazing process.

3. The electrostatic field orbital trap according to claim 1, characterized in that: The first outer electrode assembly and / or the second outer electrode assembly are obtained by processing in the following manner: A metallization layer is formed on the surface of the ceramic joint by a Mo-Mn method and then sintered; A brazing material foil is placed between the outer electrode and the sintered ceramic joint, and the outer electrode and the ceramic joint are coaxially clamped together; The coaxially clamped outer electrode and the ceramic joint are placed in a vacuum of no more than 5×10 -3 Pa, the temperature is within the range of 850±10℃, and the brazing sealing is completed; The sealing body is subjected to CNC grinding so that the tolerance of the axial length of the outer electrode and the ceramic joint is controlled to ±0.005 mm, thereby obtaining an outer electrode assembly.

4. The electrostatic field orbital trap according to claim 3, characterized in that: The ceramic joint is a high-alumina ceramic, the thickness of the metallized layer on its surface ranges from 20 μm to 50 μm, and the sintering temperature is between 1300° C. and 1500° C.; The solder foil is an Ag-Cu-Ti foil with a thickness of 0.1±0.02 mm, and the proportion of Ti is less than 3%. The clamping coaxiality tolerance of the outer electrode and the ceramic joint is less than or equal to 0.03 mm; The CNC grinding process ensures that the coaxiality tolerance between the outer electrode and the ceramic joint does not exceed 0.005 mm.

5. The electrostatic field orbital trap according to claim 1, characterized in that: The inner electrode (100) comprises an electrode body (150) and a first extension piece (130) and a second extension piece (140) located at two ends of the electrode body, the first extension piece (130), the electrode body (150) and the second extension piece (140) being an integral structure, and the axes of the three coincide with each other; The first threaded portion (110) is arranged on the first extending member (130), and the second threaded portion (120) is arranged on the second extending member (140); The tolerance between the first extension piece (130) and the first through hole is less than 0.05 mm, and the tolerance between the second extension piece (140) and the second through hole is less than 0.05 mm.

6. The electrostatic field orbital trap according to claim 5, characterized in that: The first extension member (130) is further provided with a first limiting portion, and / or the second extension member (140) is further provided with a second limiting portion (170); The first limiting portion abuts against an inner wall of the first outer electrode (210) or the first ceramic joint (310), and / or the second limiting portion (170) abuts against an inner wall of the second outer electrode (220) or the second ceramic joint (320).

7. The electrostatic field orbital trap according to claim 5, characterized in that: The first extension piece (130) and the first outer electrode assembly are provided with mutually matching locking structures to prevent the inner electrode (100) from rotating relative to the first outer electrode assembly; And / or, the second extension piece (140) and the second outer electrode assembly are provided with mutually matching locking structures to prevent the inner electrode (100) from rotating relative to the second outer electrode assembly.

8. The electrostatic field orbital trap according to claim 5, characterized in that: The inner electrode (100) is a stainless steel mallet-shaped electrode, and the electrode body (150) has a structure in which the outer diameter narrows from the middle to both sides; The coaxiality tolerance of the first extension piece (130) and the second extension piece (140) is less than or equal to 0.03 mm.

9. The electrostatic field orbital trap according to claim 8, characterized in that: Five six equally divided points on a virtual axis of an electrode body (150) of the inner electrode (100) are defined as a first position, a second position, a third position, a fourth position and a fifth position, wherein the third position is the center point of the electrode body (150); The outer diameter of the inner electrode at the third position is 40% to 45% of the inner diameter of the outer electrode at that position; The outer diameter of the inner electrode at the second position and the fourth position is 50% to 55% of the inner diameter of the outer electrode at that position; The outer diameter of the inner electrode at the first position and the fifth position is 54% to 60% of the inner diameter of the outer electrode at that position.

10. The electrostatic field orbital trap according to any one of claims 1 to 9, characterized in that: No ceramic ring or quartz ring is provided between the first outer electrode (210) of the first outer electrode assembly and the second outer electrode (220) of the second outer electrode assembly.

11. The electrostatic field orbital trap according to any one of claims 1 to 9, characterized in that: The orbital trap is not provided with a positioning component in a direction intersecting with the axial direction of the inner electrode (100).

12. A mass spectrometer, characterized in that: Comprising the electrostatic field orbital trap as claimed in any one of claims 1 to 11.

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