CN203312253U

CN203312253U - Quadrupole mass spectrometer

Info

Publication number: CN203312253U
Application number: CN2011204611805U
Authority: CN
Inventors: 葛景蔚
Original assignee: NINGBO JINTAI RUBBER AND PLASTIC CO Ltd
Current assignee: NINGBO JINTAI RUBBER AND PLASTIC CO Ltd
Priority date: 2011-11-15
Filing date: 2011-11-15
Publication date: 2013-11-27
Anticipated expiration: 2021-11-15

Abstract

The utility model discloses a quadrupole mass spectrometer. The quadrupole mass spectrometer comprises four poles evenly distributed on the circumference and a shrink-ring, wherein the internal surface of the pole is a hyperboloid, and the external surface is completely contacted with the internal surface of the shrink-ring. Compared with the prior art, the quadrupole mass spectrometer has the advantages that as the external surfaces of four hyperboloid poles are completely contacted with the internal surface of the shrink-ring which fixes the poles, the accurate relative positions of the four poles can be guaranteed; as the above contacts are face contacts, the structure is more stable; and improved hyperbolic fields can be substantially provided in a utilization process, thus resolution ratio and sensitivity of the mass spectrometer are ensured. The utility model further discloses a mass spectrometer pole, and the mass spectrometer pole is provided with one hyperboloid and an arc projection face relative to the hyperboloid. The mass spectrometer pole has lower difficulty in processing.

Description

Quadrupole mass spectrometer

Technical field

The utility model relates to mass spectrometer, relates in particular to a kind of quadrupole mass spectrometer and mass spectrometer utmost point bar, belongs to the analytical and testing instrument technical field.

Background technology

Mass spectrometer is the different isotopic instruments of a kind of separation and detection, namely according to charged particle can deflection in gas magnetic field principle, by the mass discrepancy of material atom, molecule or molecular fragment, carry out a quasi-instrument of separation and detection material composition.In prior art, mass spectrometer has the various ways such as the rotatable mass spectrometer of magnetic biasing, ion trap (ORBITRAP) and level Four bar mass spectrometer (Q-MS), and wherein, quadrupole mass spectrometer is the most ripe and most widely used a kind of at present.

Quadrupole mass spectrometer produces the level Four field by incoming radio frequency signal on the hyperboloid quadrupole rod, and ion is subject to strong focussing force and axle focusing wherein in the level Four field.With reference to shown in Figure 1, with schematic diagram, from visible this figure, four utmost point bar circumference array in quadrupole mass spectrometer are uniform for quadrupole mass spectrometer principle of the prior art, and in the course of the work, two utmost point bars at diagonal angle are connected into one group.One group adds positive direct-current voltages (anodal bar); Another group adds negative DC voltage (negative pole bar).Two groups of magnitudes of voltage are equal, and polarity is opposite.And simultaneously, on the quadrupole rod of place, all add simultaneously radio-frequency voltage.In quadrupole mass spectrometer, can describe by the solution of second order linear differential equation Mathieu equation on mathematics from ionogenic ion motion, utilize ion in the characteristic that Mathieu equation stability of solution has on the way, can realize the scanning of the mass spectrum of ion.

Yet, for above-mentioned quadrupole mass spectrometer, in order to obtain analysis result preferably, should be able to produce perfect hyperbolic field between lower four utmost point bars of perfect condition, this has just proposed very high requirement to the relative position between four utmost point bars.In prior art, in order to reach this purpose, simplify installation procedure, usually with cylindrical utmost point bar, replace hyperboloid utmost point bar, this obviously can not produce perfect hyperbolic field, and the manufacture process of the unitary, injection-molded mode abroad occurred, because cost is high, often can not be most of producers and user's acceptance.

Summary of the invention

A kind of quadrupole mass spectrometer and mass spectrometer utmost point bar are provided during the technical problems to be solved in the utility model, make the hyperboloid utmost point bar in this mass spectrometer easily keep strict dimensional requirement, produce perfect hyperbolic field with this.

In order to solve the problems of the technologies described above, the utility model provides a kind of quadrupole mass spectrometer, comprising: four utmost point bars of circumference uniform distribution, and the collar, the inner surface of described utmost point bar is hyperboloid, and its outer surface contacts fully with the inner surface of the described collar.

Further, the outer surface of the described collar is periphery.

Further, the outer surface of the described collar is the POLYHEDRAL COMBINATORICS body.

Further, described utmost point bar and the described collar are bolted connection.

Further, the inner surface of the described collar is periphery.

Further, the inner surface of the described collar has four uniform microprotrusion, and each described microprotrusion is arranged between the termination of two adjacent described utmost point bars.

Further, the described collar is a plurality of, and is spaced apart and arranged in the outside of four described utmost point bars.

Further, the uniform outside that is spaced apart and arranged in four described utmost point bars of described a plurality of collar.

The utility model also provides a kind of mass spectrometer utmost point bar, and it has a hyperboloid, also has the circular arc crowning relative with hyperboloid.

Further, the radius of described circular arc crowning is determined according to the preset external member radius in outside.

Compared with prior art, the utlity model has following advantage: in mass spectrometer provided by the utility model, the outer surface of four hyperboloid utmost point bars all contacts fully with the inner surface of the collar of fixing described utmost point bar, can guarantee the accurate relative position of four utmost point bars, and because above-mentioned contact is the face contact, so structure is more stable, in practical process, obviously can carries that perfect hyperboloid, thereby guarantee mass spectrometric resolution and sensitivity.

The accompanying drawing explanation

Fig. 1 is the principle schematic of quadrupole mass spectrometer of the prior art.

Fig. 2 is the structure of quadrupole schematic diagram of the quadrupole mass spectrometer of the utility model embodiment.

Embodiment

Below in conjunction with drawings and the specific embodiments, the utility model is described further, but not as to restriction of the present utility model.

With reference to shown in Figure 2, quadrupole rod structural scheme of mechanism for quadrupole mass spectrometer of the present utility model, as can be seen from the figure: this quadrupole mass spectrometer comprises: the utmost point bar 1 of four circumference array and several (in figure, schematically illustrated position is 3) collars 2, the inner surface of described utmost point bar 1 is hyperboloid 11, its outer surface is the arc surface 12 that hyperboloid 11 is relative, the described collar 2 is convex structure, its outer surface is periphery, and contact fully with the inner surface of the described collar 2 as the arc surface 12 of utmost point rod outer surface, that is: arc surface 12 has identical radius value with the inner surface place with its collar contacted fully 2.Described utmost point bar 1 is mutually permanently connected with the described collar 2, and this can be by fastening realization of bolt (in order to simplify view, in figure for illustrating), or in other specific occasion, also can realize by bonding mode by force.

In said structure, the quantity of the described collar can be determined according to the length of utmost point bar, and when being provided with a plurality of collar, a plurality of collars can be spaced apart and arranged in the outside of described utmost point bar, because now the axial dimension of the collar can be less, simplify and manufacture and assemble to obtain difficulty so can be easy to.Preferably, a plurality of collars can uniformly be spaced apart and arranged in the outside of described utmost point bar.Certainly, also can be only at collar of arranged outside of described utmost point bar, now, for more steadily, forms and firmly be connected exactly with between utmost point bar, desired collar axial dimension is larger, the difficulty that this will certainly increase manufacture and assemble.

The quadrupole mass spectrometer provided when the present embodiment is when work, similar with quadrupole mass spectrometer working method in prior art, and two utmost point bars at diagonal angle are connected into to one group.One group adds positive direct-current voltages (anodal bar); Another group adds negative DC voltage (negative pole bar).Two groups of magnitudes of voltage are equal, and polarity is opposite.And simultaneously, on all quadrupole rods, all add simultaneously radio-frequency voltage.In quadrupole mass spectrometer, can describe by the solution of second order linear differential equation Mathieu equation on mathematics from ionogenic ion motion, the characteristic of utilizing ion to have in the stability diagram of Mathieu solution of equation, can realize the scanning of the mass spectrum of ion.

Therefore, the present embodiment has following advantage: because the outer surface of four hyperboloid utmost point bars all contacts fully with the inner surface of the collar of fixing described utmost point bar, this can guarantee the accurate relative position of four utmost point bars, and because above-mentioned contact is the face contact, so structure is more stable, in practical process, obviously can provide perfect hyperbolic field, thereby guarantee mass spectrometric resolution and sensitivity.

In addition, in other embodiments, the outer surface of the described collar 2 can not be periphery, but the assembly on a plurality of planes, or other given shapes, its shape that will process can according to the time the expection external environment condition determine.

In addition, in other embodiments, the inner surface of the described collar 2 can further have four uniform microprotrusion, and each described microprotrusion is arranged between the termination of two adjacent described utmost point bars, can further be easy to thus the accurate location between the described collar 2 and described utmost point bar 1.

In addition, the utility model also provides a kind of mass spectrometer utmost point bar, and it has a hyperboloid and the relative circular arc crowning of hyperboloid, and the radius of described circular arc crowning is determined according to the preset external member radius in outside.

Visible, this mass spectrometer utmost point bar only forms hyperboloid at a face, and another face circle of position cambered surface, reduced its difficulty in the course of processing thus, reduced processing cost.

Also it should be noted that; the above is only preferred implementation of the present utility model; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be protection range of the present utility model.In addition, accompanying drawing is schematically fully, and draws not in scale.Especially, for the purpose of clarity, some size is exaggerated.Similar parts in figure are meaned by identical Reference numeral.

Claims

1. quadrupole mass spectrometer comprises: four utmost point bars of circumference uniform distribution, it is characterized in that, and this quadrupole mass spectrometer also comprises: the collar, the inner surface of described utmost point bar are hyperboloid, and its outer surface contacts fully with the inner surface of the described collar.

2. quadrupole mass spectrometer as claimed in claim 1, is characterized in that, the outer surface of the described collar is periphery.

3. quadrupole mass spectrometer as claimed in claim 2, is characterized in that, the outer surface of the described collar is many set of planes zoarium.

4. quadrupole mass spectrometer as claimed in claim 3, is characterized in that, described utmost point bar and the described collar are bolted connection.

5. quadrupole mass spectrometer as claimed in claim 4, is characterized in that, described cover ring inner surface is periphery.

6. quadrupole mass spectrometer as described as claim 1 to 5 any one, is characterized in that, described cover ring inner surface has four uniform micro-protuberances, and each described micro-protuberance is arranged between the termination of four adjacent described utmost point bars.

7. quadrupole mass spectrometer as claimed in claim 6, is characterized in that, the described collar is a plurality of, and be spaced apart and arranged in the outside of four described utmost point bars.

8. quadrupole mass spectrometer as claimed in claim 7, is characterized in that, the uniform outside that is spaced apart and arranged in four described utmost point bars of described a plurality of collars.