A hexapole collision reaction cell with axial acceleration function

Abstract

The present invention relates to the field of ultra-trace element analysis instruments, and in particular to a hexapole collision reaction cell with an axial acceleration function, comprising a collision reaction cell body, a first PEEK fixing ring, a hexapole, a reaction cell back cover, a limit bolt, a hexapole wire ring, a hexapole wire column, a hexapole pole piece, a second PEEK fixing ring, a first pole piece fixing ring, a second pole piece fixing ring, an insulating sealing pad, a DC terminal, a pole piece connecting piece, a hexapole wire connecting column, a first fixing bolt, a second fixing bolt, a third fixing bolt, and a fourth fixing bolt. The present invention inserts pole pieces between the hexapole rods, controls the axial velocity of ions passing through by adjusting the pole piece voltage and current, and realizes intelligent tuning of ion transmission. The increase in the axial velocity of ions can greatly reduce the influence of the edge field on the ions to be measured.

Description

Technical Field

[0001] The invention relates to the field of ultra-trace element analysis instruments, and in particular to a hexapole collision reaction cell with an axial acceleration function. Background Art

[0002] CP / MS is an ultra-trace element analysis instrument. The mainstream products on the market today are equipped with collision reaction cells. Most collision reaction cells are located after the ion lens. The collision reaction cells are composed of a barrel-shaped cell body with holes for ion entry and exit at both ends, and holes for collision or reaction gas entry and exit on the barrel wall. The cell is equipped with multipoles, which are currently mainly quadrupole structures, hexapole structures, and octopole structures. The efficiency of the ions to be measured in the instrument transmission process directly affects the final signal strength and sensitivity of the instrument. When in collision or reaction mode, there are a large number of collision or reaction gas molecules in the collision reaction cell. After the ions enter the collision reaction cell, due to multiple collisions with these gas molecules, the kinetic energy of some ions, especially ions of light-weight elements, is greatly reduced, and they cannot fly out of the exit of the collision reaction cell, resulting in a decrease in the ion passing efficiency, that is, a decrease in the sensitivity of the instrument.

[0003] In a conventional hexapole collision reaction cell, ions pass through the ion lens system and then enter the cell body through the small hole at the front end of the collision reaction cell along with the airflow. Due to the collision between the ions and the gas in the cell body and the thermal effect of the ions, the axial velocity of the ions is greatly reduced. The conventional hexapole structure cannot control the axial velocity of the ions, so that the ion signal cannot reach the optimal value. Summary of the invention

[0004] The object of the present invention is to provide a hexapole collision reaction cell with an axial acceleration function.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Provided is a hexapole collision reaction cell with an axial acceleration function, comprising a pre-collision reaction cell body, a first PEEK fixing ring, a hexapole, a reaction cell back cover, a limiting bolt, a hexapole wire ring, a hexapole wire column, a hexapole pole piece, a second PEEK fixing ring, a first pole piece fixing ring, a second pole piece fixing ring, an insulating sealing pad, a DC terminal, a pole piece connecting piece, a hexapole wire connecting column, a first fixing bolt, a second fixing bolt, a third fixing bolt, and a fourth fixing bolt; the first PEEK fixing ring is fixedly arranged through the collision reaction cell body, a second PEEK fixing ring is arranged inside the first PEEK fixing ring, and the hexapole The pole is fixedly arranged in a semicircular groove on the first PEEK fixing ring and the second PEEK fixing ring to form an integrated structure, the hexapole pole piece is embedded in the axial groove of the first PEEK fixing ring and the second PEEK fixing ring and fixed by the first pole piece fixing ring and the second pole piece fixing ring, two hexapole wire rings are arranged on the rear side of the first PEEK fixing ring, the first PEEK fixing ring is closed by the rear cover of the reaction tank, and an insulating sealing gasket is fixedly arranged on the rear cover of the reaction tank, the first PEEK fixing ring is provided with a plurality of through holes, and a DC terminal, a hexapole wire connecting column, and a hexapole wire column are respectively fixedly arranged in the plurality of through holes.

[0007] Furthermore, the hexapole wire column, the hexapole wire ring, the hexapole wire connecting column and the hexapole form three groups of passages.

[0008] Furthermore, the DC terminal forms a passage with the pole piece connecting piece and the hexapole pole piece.

[0009] Furthermore, the DC terminal and the hexapole wire connecting terminal are fixed by a first fixing bolt and a second fixing bolt.

[0010] Furthermore, the first PEEK fixing ring and the second PEEK fixing ring are fixed by a plurality of fourth fixing bolts.

[0011] Furthermore, the first PEEK fixing ring and the collision reaction pool body are fixed by a plurality of limiting bolts.

[0012] Furthermore, the first pole piece fixing ring is provided with a plurality of screw holes, and fourth fixing bolts are matched in the plurality of screw holes.

[0013] Beneficial effects of the present invention:

[0014] In the design of the present invention, a pole piece is inserted between the hexapole rods, and the axial velocity of the ions passing through is controlled by adjusting the voltage and current of the pole piece, thereby realizing intelligent tuning of ion transmission; the increase in the axial velocity of the ions can greatly reduce the influence of the fringe field on the ions to be measured;

[0015] (1) Axial acceleration improves the sensitivity of the reaction mode

[0016] The reaction product ions are relatively large and slow; low velocity can lead to reduced ion transmission due to collision scattering or space charge repulsion; axial acceleration gives these product ions more energy, allowing them to overcome these effects and transmit along the ion axial route, thereby improving sensitivity.

[0017] (2) Suppressing the formation of higher-order product ions

[0018] Since the increased collision energy exceeds the weak bond energy of potential higher-order cluster ions, the additional acceleration energy can also be used to increase sensitivity to lower-order product ions by suppressing the formation of higher-order clusters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments of the present invention are briefly introduced below.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] In the figure:

[0022] 1 collision reaction cell body, 2 first PEEK fixing ring, 3 hexapole, 4 reaction cell back cover, 5 limit bolt, 6 hexapole wire ring, 7 hexapole wire column, 8 hexapole pole piece, 9 second PEEK fixing ring, 10 first pole piece fixing ring, 11 second pole piece fixing ring, 12 insulating sealing pad, 13 DC terminal, 15 hexapole wire connecting column, 16 first fixing bolt, 17 second fixing bolt, 18 third fixing bolt, 19 fourth fixing bolt. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0024] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product.

[0025] Reference Figure 1The hexapole collision reaction cell with axial acceleration function shown in the figure comprises a collision reaction cell body 1, a first PEEK fixing ring 2, a hexapole 3, a reaction cell back cover 4, a limiting bolt 5, a hexapole wire ring 6, a hexapole wire column 7, a hexapole pole piece 8, a second PEEK fixing ring 9, a first pole piece fixing ring 10, a second pole piece fixing ring 11, an insulating sealing pad 12, a DC terminal 13, a pole piece connecting piece, a hexapole wire connecting column 15, a first fixing bolt 16, a second fixing bolt 17, a third fixing bolt 18, and a fourth fixing bolt 19; the first PEEK fixing ring 2 is fixedly arranged through the collision reaction cell body 1, and the second PEEK fixing ring 9 is arranged in the first PEEK fixing ring 2 as the main body of the overall device, and the hexapole 3 is fixedly arranged in the first PEEK fixing ring 2. An integral structure is formed in the semicircular groove on the fixed ring 2 and the second fixed PEEK ring 3. The hexapole pole piece 8 is embedded in the axial groove of the first PEEK fixed ring 2 and the second PEEK fixed ring 9 and fixed by the first pole piece fixing ring 10 and the second pole piece fixing ring 11 to ensure the fixing effect. Two hexapole wire rings 6 are arranged on the rear side of the first PEEK fixed ring 2. The first PEEK fixed ring 2 is closed by the reaction cell rear cover 4, and the reaction cell rear cover 4 is fixedly provided with an insulating sealing gasket 12. The reaction cell rear cover 4 plays a sealing role, and the insulating sealing gasket 12 plays an insulating protection role at the same time. A plurality of through holes are arranged on the first PEEK fixed ring 2, and DC terminals 13, hexapole wire connecting terminals 15, and hexapole wire terminals 7 are respectively fixedly arranged in the plurality of through holes to form different passages.

[0026] The hexapole wire column 7, the hexapole wire ring 6, the hexapole wire connecting column 15 and the hexapole 3 form three groups of passages. The inner side of the hexapole pole piece 8 is tilted relative to the axis to form a front and rear potential difference inside the collision reaction cell 1 to promote the accelerated movement of ions.

[0027] Among them, the DC terminal 13 forms a passage with the pole piece connecting piece and the hexapole pole piece 8, and the precise control of the ion passing speed is achieved by adjusting the positive and negative magnitude of the DC voltage.

[0028] The DC terminal 13 and the hexapole wire connecting terminal 15 are fixed by a first fixing bolt 16 and a second fixing bolt 17 to play a fixing role.

[0029] The first PEEK fixing ring 2 and the second PEEK fixing ring 9 are fixed by a plurality of fourth fixing bolts 19 to ensure the overall fixation and stability.

[0030] The first PEEK fixing ring 2 and the collision reaction pool body 1 are fixed by a plurality of limiting bolts 5 to form the overall device main body structure.

[0031] The first pole piece fixing ring 10 is provided with a plurality of screw holes, in which fourth fixing bolts 19 are matched and arranged, and the second pole piece fixing ring 11 is provided with a plurality of corresponding screw holes.

[0032] The working steps of a hexapole collision reaction cell structure with a pole piece are as follows:

[0033] Three sets of DC voltages are applied to the hexapole through the hexapole wire column, hexapole wire ring, and hexapole wire connection column. One set of DC voltage is applied to the hexapole pole piece through the DC terminal and the pole piece connection piece. Since the inner side of the hexapole pole piece is tilted relative to the axis, the potential difference before and after is formed inside the collision reaction cell, which drives the ions to accelerate. By adjusting the positive and negative magnitude of the DC voltage, the ion passing speed can be precisely controlled.

[0034] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A hexapole collision reaction cell with axial acceleration function, characterized in that: The invention comprises a collision reaction pool body (1), a first PEEK fixing ring (2), a hexapole (3), a reaction pool back cover (4), a limiting bolt (5), a hexapole wire ring (6), a hexapole wire column (7), a hexapole pole piece (8), a second PEEK fixing ring (9), a first pole piece fixing ring (10), a second pole piece fixing ring (11), an insulating sealing pad (12), a DC terminal (13), a pole piece connecting plate, a hexapole wire connecting column (15), a first fixing bolt (16), a second fixing bolt (17), a third fixing bolt (18), and a fourth fixing bolt (19); the first PEEK fixing ring (2) is fixedly arranged to penetrate the collision reaction pool body (1), the first PEEK fixing ring (2) is provided with a second PEEK fixing ring (9), the hexapole (3 ) is fixedly arranged in a semicircular groove on a first PEEK fixing ring (2) and a second PEEK fixing ring (9) to form an integrated structure; the hexapole pole piece (8) is embedded in the axial groove of the first PEEK fixing ring (2) and the second PEEK fixing ring (9) and fixed by a first pole piece fixing ring (10) and a second pole piece fixing ring (11); two hexapole wire rings (6) are arranged on the rear side of the first PEEK fixing ring (2); the first PEEK fixing ring (2) is closed by a reaction cell rear cover (4), and an insulating sealing gasket (12) is fixedly arranged on the reaction cell rear cover (4); a plurality of through holes are provided on the first PEEK fixing ring (2), and a DC terminal (13), a hexapole wire connecting terminal (15), and a hexapole wire terminal (7) are fixedly arranged in the plurality of through holes.

2. A hexapole collision reaction cell with axial acceleration function according to claim 1, characterized in that: The hexapole wire column (7), the hexapole wire ring (6), the hexapole wire connecting column (15) and the hexapole (3) form three groups of passages.

3. The hexapole collision reaction cell with axial acceleration function according to claim 1, characterized in that: The DC terminal (13) forms a passage with the pole piece connecting piece and the hexapole pole piece (8).

4. The hexapole collision reaction cell with axial acceleration function according to claim 1, characterized in that: The DC terminal (13) and the hexapole wire connecting terminal (15) are fixed by a first fixing bolt (16) and a second fixing bolt (17).

5. The hexapole collision reaction cell with axial acceleration function according to claim 1, characterized in that: The first PEEK fixing ring (2) and the second PEEK fixing ring (9) are fixed by a plurality of fourth fixing bolts (19).

6. The hexapole collision reaction cell with axial acceleration function according to claim 1, characterized in that: The first PEEK fixing ring (2) and the collision reaction cell body (1) are fixed by a plurality of limiting bolts (5).

7. The hexapole collision reaction cell with axial acceleration function according to claim 1, characterized in that: The first pole piece fixing ring (10) is provided with a plurality of screw holes, and fourth fixing bolts (19) are matched and arranged in the plurality of screw holes.

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