Sample injector and chromatographic instrument

Abstract

The sample injector comprises a valve stator and a valve rotor, a first stator groove communicated with a third outlet hole is further formed in the second surface of the valve stator, and when the valve rotor is located at a sample injection position, a first outlet hole is communicated with a second connecting hole through a second rotor groove; the first stator groove is staggered with the first connecting hole, the second inlet hole and the first rotor groove; when the valve rotor is located at the waste discharge position, the second rotor groove and the third rotor groove are staggered with the first outlet hole. The utility model provides a sample injector which ensures that residual liquid in a stator groove cannot enter a sample injection ring when a sample injection valve is at a sample injection position by improving a passage structure, so that the accuracy and the reliability of sample injection are ensured. And meanwhile, the connection mode of the waste discharge position and the passage connected with the chromatographic column is adjusted, so that the pollution and damage of liquid or gas residues to the chromatographic column are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sample injectors, and more specifically to a sample injector and a chromatograph. Background Art

[0002] In the authorization announcement number CN 114518426 A, an injection valve is disclosed, which realizes switching between the sample loading state, the injection state and the waste discharge state by rotating the relative angle between the valve rotor and the valve stator. The first rotor position corresponds to the sample loading position, the second rotor position corresponds to the injection position, and the third rotor position corresponds to the waste discharge position.

[0003] In actual use, it is found that the above patent solution has the following defects:

[0004] 1. At the injection position, the first rotor groove, the injection ring and the second rotor groove form an injection passage. At this time, the stator groove is connected to the injection passage through the first connecting hole. The liquid or gas residue in the stator groove will be brought into the injection ring, affecting the accuracy and reliability of the injection. In addition, the residual gas may damage the chromatography column during injection.

[0005] 2. At the waste discharge position, the first outlet hole of the chromatography column is connected to the third rotor slot. Liquid or gas residue may exist in the third rotor slot. The residual liquid may contaminate the chromatography column; the residual gas may damage the chromatography column. Utility Model Content

[0006] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model proposes an injector, which improves the passage structure to ensure that the liquid residue in the stator groove does not enter the injection ring when the injection valve is in the injection position, thereby ensuring the accuracy and reliability of the injection. At the same time, the waste discharge position and the passage connection method connected to the chromatography column are adjusted to effectively avoid the contamination and damage of the chromatography column by liquid or gas residue.

[0007] The utility model also provides a chromatograph with the above-mentioned sample injector.

[0008] The technical solution adopted by the utility model is: to provide a sample injector, including a valve stator and a valve rotor;

[0009] The second surface of the valve stator is also provided with a first stator groove communicating with the third outlet hole.

[0010] When the valve rotor is in the injection position:

[0011] The first stator slot on the valve rotor is staggered with the first connection hole, the second inlet hole and the first rotor slot;

[0012] When the valve rotor is in the waste position:

[0013] The second rotor slot and the third rotor slot on the valve rotor are both staggered with the first outlet hole.

[0014] Compared with the prior art, this application has the following advantages:

[0015] 1. Compared with the prior art, the above scheme optimizes the structure of the valve stator. When the optimized injection valve is in the second rotor position, the injection valve is in the injection state, the second inlet port is used for externally connecting the system pump, the first outlet port is used for externally connecting the chromatography column, the second inlet port, the second inlet hole, the first rotor slot, the first connecting hole, the first connecting port, the injection ring, the second connecting port, the second connecting hole, the second rotor slot, the first outlet hole and the first outlet port sequentially constitute the injection path, and the entire injection path has no side channel, which effectively avoids the liquid residue in the side channel from affecting the injection, and prevents the residual gas from damaging the chromatography column during injection.

[0016] 2. When the optimized injection valve is in the third rotor position, the injection valve is in a waste discharge state, and the first outlet hole directly forms a seal with the first surface of the valve rotor, that is, the first rotor slot, the second rotor slot, and the third rotor slot are all staggered from the first outlet hole. This effectively prevents the liquid residue in the first rotor slot, the second rotor slot, or the third rotor slot from flowing into the chromatography column through the first outlet hole and the first outlet port, thereby preventing the liquid or gas residue from contaminating or damaging the chromatography column.

[0017] 3. At the waste discharge position of the optimized injector, the second inlet port, the second inlet hole, the first rotor slot, the third outlet hole and the third outlet port form a waste discharge channel, and the first stator slot is connected to the waste discharge channel. Part of the mobile phase will flow through the first rotor slot to flush out the sample or dirt that may remain therein, thereby ensuring the accuracy and reliability of the injector in subsequent analysis.

[0018] According to an embodiment of the utility model, the second surface of the valve stator is further provided with a second stator groove communicating with the second outlet hole.

[0019] When the valve rotor is in the fourth rotor position:

[0020] The second stator slot connects the second outlet hole with the first outlet hole through the third rotor slot: when the optimized injector is in the fourth rotor position, the second outlet port is used for an external injection device, such as a syringe or a sample pump, and the second outlet port, the second outlet hole, the second stator slot, the third rotor slot, the first outlet hole and the first outlet port are combined to form a passage, and the injection device can directly pump the sample to be analyzed into the chromatography column through the passage.

[0021] According to an embodiment of the present utility model, when the valve rotor is located at a fourth rotor position, the first rotor groove connects the second inlet hole with the second connecting hole.

[0022] According to one embodiment of the utility model, when the valve rotor is located at the fifth rotor position, the second rotor groove connects the second outlet hole with the third outlet hole; when the optimized injector is in the fifth rotor position, the second outlet port is used for an external injection device, and the second outlet port, the second outlet hole, the second rotor groove, the third outlet hole and the third outlet port are combined to form a waste discharge channel, and the injection device directly pumps the mobile phase through the waste discharge channel, thereby thoroughly cleaning it, increasing the pumping pressure of the injection device, and a part of the mobile phase will flow through the first stator groove and / or the second stator groove, and clean it.

[0023] According to one embodiment of the present utility model, the first rotor slot is a straight slot or an arc slot;

[0024] and / or the second rotor slot is a straight slot or an arc slot;

[0025] And / or the third rotor slot is a straight slot or an arc slot.

[0026] According to one embodiment of the present invention, the first outlet hole, the first connecting hole, the second outlet hole, the third outlet hole, the first inlet hole, the first connecting hole and the second inlet hole are distributed in sequence at equal angles and distances with the axis of the second inlet hole as the center.

[0027] According to an embodiment of the present utility model, the shortest distance between the first outlet hole and the second outlet hole is L1, and the shortest distance between the two ends of the third rotor slot is L2, L2<L1;

[0028] And / or the shortest distance between the first outlet hole and the second outlet hole is L1, the shortest distance between two ends of the first stator slot is L3, and L3<L1.

[0029] According to an embodiment of the present utility model, the first stator slot is a straight slot or an arc slot.

[0030] According to an embodiment of the present invention, the second stator slot is a straight slot or an arc slot.

[0031] A chromatograph comprises any one of the above-mentioned sample injectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model 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 of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic side view of the sample injector in Example 1 of the utility model;

[0034] Figure 2 This is a schematic structural diagram of the first surface of the valve stator in Example 1 of the utility model;

[0035] Figure 3 This is a schematic structural diagram of the second surface of the valve stator in Example 1 of the utility model;

[0036] Figure 4 This is a schematic diagram of the structure of the first surface of the valve rotor in Example 1 of the utility model;

[0037] Figure 5 Schematic diagram of the sample loading position in Example 1 of the present utility model;

[0038] Figure 6 Schematic diagram of the injection position in Example 1 of the utility model;

[0039] Figure 7 This is a schematic diagram of the waste discharge position in Example 1 of the utility model;

[0040] Figure 8 This is a schematic structural diagram of the second surface of the valve stator in Example 2 of the utility model;

[0041] Fig. 9 This is a schematic diagram of the structure of the first surface of the valve rotor in Example 2 of the utility model;

[0042] Fig.10 Schematic diagram of the sample loading position in Example 2 of the present utility model;

[0043] Fig.11 Schematic diagram of the injection position in Example 2 of the utility model;

[0044] Fig.12 This is a schematic diagram of the waste discharge position in Example 2 of the utility model;

[0045] Fig.13 Schematic diagram of the fourth rotor position in Embodiment 2 of the present utility model;

[0046] Fig.14 This is a schematic diagram of the fifth rotor position in Example 2 of the present utility model.

[0047] Description of the numbers in the figure:

[0048] 11. valve stator; 12. valve rotor; 13. rotating shaft; 14. driving unit;

[0049] 1a, first outlet port; 2a, first connection port; 3a, second outlet port; 4a, third outlet port; 5a, first inlet port; 6a, second connection port; 7a, second inlet port;

[0050] 1b, first outlet hole; 2b, first connecting hole; 3b, second outlet hole; 4b, third outlet hole; 5b, first inlet hole; 6b, second connecting hole; 7b, second inlet hole;

[0051] 11a, first surface; 11b, second surface;

[0052] 12a, a first surface;

[0053] 21. First stator slot; 22. First rotor slot; 23. Second rotor slot; 24. Third rotor slot; 25. Injection ring; 26. Second stator slot. DETAILED DESCRIPTION

[0054] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0055] In this embodiment, the technical solution adopted by the sample injector is the same as the main body of the sample injection valve disclosed in the embodiment of CN 114518426 A. The difference is that the setting position of the stator groove of the sample injection valve disclosed in the embodiment of CN 114518426 A is different from the setting position of the first stator groove 21, 21' in this embodiment. On this basis, the solution in Example 2 is derived, that is, a second stator groove 26 connected to the second outlet hole 3b' is added to the second surface 11b of the valve stator 11. The setting of the second stator groove 26 brings the sample injector a function that the existing sample injection valve does not have, that is, the fourth rotor position and the fifth rotor position in this embodiment. When the valve rotor 12 is at the fourth rotor position, the sample or mobile phase is directly injected into the chromatography column through the sample injection device, and the sample injection device is independent of the system pump. When the valve rotor is located at the fifth rotor position, waste is discharged through the sample injection device, and during the waste discharge process, a portion of the mobile phase will flow through the first stator slots 21, 21' and / or the second stator slots 26 and be cleaned.

[0056] Specifically, in the injection valve disclosed in the embodiment of CN 114518426 A, the stator slot is connected to the first connecting hole; while in the present embodiment, the first stator slots 21, 21' are connected to the third outlet holes 4b, 4b'.

[0057] Specifically, the injection valve disclosed in the embodiment of CN 114518426 A has a first rotor position corresponding to the sample loading position in this embodiment, a second rotor position corresponding to the injection position in this embodiment, and a third rotor position corresponding to the waste discharge position in this embodiment. Embodiment 1

[0058] Combination Figure 1-7 As shown, the injector in this embodiment includes a valve stator 11 and a valve rotor 12. The first surface 11a of the valve stator 11 is provided with a first outlet port 1a, a second outlet port 3a, a third outlet port 4a, a first inlet port 5a, a second inlet port 7a, a first connection port 2a, and a second connection port 6a. The second surface 11b of the valve stator 11 is provided with a first outlet hole 1b communicating with the first outlet port 1a, a second outlet hole 3b communicating with the second outlet port 3a, a third outlet hole 4b communicating with the third outlet port 4a, and a first inlet port 5a, a second inlet port 7a, a first connection port 2a, and a second connection port 6a. A first inlet hole 5b connected to an inlet port 5a, a second inlet hole 7b connected to a second inlet port 7a, a first connecting hole 2b connected to a first connecting port 2a, and a second connecting hole 6b connected to a second connecting port 6a, the second inlet hole 7b is positioned at the center of the inner stator surface, and the center of the inner stator surface is located on the rotation axis 13 line of the valve rotor 12, and the first outlet hole 1b, the second outlet hole 3b, the third outlet hole 4b, the first inlet hole 5b, the first connecting hole 2b and the second connecting hole 6b are distributed on a circle with the center of the inner stator surface.

[0059] Furthermore, combined with Figure 1 As shown, in this embodiment, the valve stator 11 and the valve rotor 12 both have opposite first surfaces 11a, 12a and second surfaces 11b, the first surface 11a of the valve stator 11 is located at its outer end, and the second surface 11b of the valve stator 11 faces the first surface 12a of the valve rotor 12. The rotating shaft of the driving unit 14 is connected to one end of the rotating shaft 13, and the other end of the rotating shaft 13 is fixedly connected to the second surface 11b of the valve rotor 12. The driving unit 14 drives the valve rotor 12 to rotate relative to the valve stator 11 through the rotating shaft 13.

[0060] Further, in this embodiment, the first connection port 2a and the second connection port 6a are respectively used to connect one end of the injection loop 25. The first outlet port 1a is used to connect to an external chromatography column, and the third outlet port 4a is used to connect to an external waste liquid container. The first inlet port 5a is connected to an injection device, such as a syringe or a sample pump.

[0061] Combination Figure 2 As shown, in this embodiment, the first outlet hole 1b, the first connection hole 2b, the second outlet hole 3b, the third outlet hole 4b, the first inlet hole 5b and the second connection hole 6b are all distributed in sequence at equal angles and equal distances with the axis of the second inlet hole 7b as the center. Correspondingly, since the first outlet hole 1b and the first outlet port 1a, the first connection hole 2b and the first connection port 2a, the second outlet and the second outlet port 3a, the third outlet hole 4b and the third outlet port 4a, the first inlet hole 5b and the first inlet port 5a, the second connection hole 6b and the second connection port 6a, and the second inlet hole 7b and the second inlet port 7a are all coaxially arranged. Therefore, the first outlet port 1a, the first connection port 2a, the second outlet port 3a, the third outlet port 4a, the first inlet port 5a and the second connection port 6a are all distributed in sequence at equal angles and equal distances with the axis of the second inlet port 7a as the center.

[0062] Furthermore, combined with Figure 2-3 As shown, in the first outlet port 1a, the first connection port 2a, the second outlet port 3a, the third outlet port 4a, the first inlet port 5a, the second connection port 6a and the second inlet port 7a, the distance between each two adjacent ports is R. Similarly, in the first outlet hole 1b, the first connection hole 2b, the second outlet hole 3b, the third outlet hole 4b, the first inlet hole 5b, the second connection hole 6b and the second inlet hole 7b, the distance between each two adjacent holes is R.

[0063] Furthermore, combined with Figure 3-4 As shown, the second surface 11b of the valve stator 11 is further provided with a first stator slot 21 communicating with the third outlet hole 4b, and the first surface 12a of the valve rotor 12 includes a first rotor slot 22, a second rotor slot 23 and a third rotor slot 24, and these three slots are arranged as follows;

[0064] Combination Figure 5 As shown, when the valve rotor 12 is located at the sample loading position: the first rotor groove 22 connects the second inlet hole 7b with the first outlet hole 1b, the second rotor groove 23 connects the first inlet hole 5b with the second connecting hole 6b, and the first stator groove 21 connects the first connecting hole 2b with the third outlet hole 4b through the third rotor groove 24;

[0065] Combination Figure 6 As shown, when the valve rotor 12 is located at the injection position: the first rotor slot 22 connects the second inlet hole 7b with the first connecting hole 2b, the second rotor slot 23 connects the first outlet hole 1b with the second connecting hole 6b, and the first stator slot 21 is staggered with the first connecting hole 2b, the second inlet hole 7b and the first rotor slot 22;

[0066] Combination Figure 7As shown, when the valve rotor 12 is located at the waste discharge position: the first rotor groove 22 connects the second inlet hole 7b with the third outlet hole 4b, and the second rotor groove 23 and the third rotor groove 24 are staggered with the first outlet hole 1b.

[0067] Furthermore, combined with Figure 5 As shown, when the valve rotor 12 is located at the sample loading position, the sample injector is in the sample loading state, and the sample is injected into the first inlet port 5a through the sample injection device, and the sample flows through the first inlet hole 5b, the second rotor groove 23, the second connection hole 6b, the second connection port 6a, the injection ring 25, the first connection port 2a, the first connection hole 2b, the third rotor groove 24, the first stator groove 21 and the third outlet hole 4b in sequence, and finally the excess sample is discharged outward through the third outlet port 4a. After the injection ring 25 is full of the sample, the valve rotor 12 is driven by the driving unit 14 to rotate relative to the valve stator 11, and the valve rotor 12 is switched from the sample loading position to the injection position.

[0068] Combination Figure 6 As shown, when the valve rotor 12 is located at the injection position, the injector is in the injection state, and the system pump connected to the second inlet port 7a sequentially delivers the quantitative sample in the injection loop 25 to the chromatography column through the second inlet hole 7b, the first rotor slot 22, the first connection hole 2b, the first connection port 2a, the injection loop 25, the second connection port 6a, the second connection hole 6b, the second rotor slot 23, the first outlet hole 1b and the first outlet port 1a. Then, the valve rotor 12 is driven by the driving unit 14 to rotate relative to the valve stator 11, and the valve rotor 12 is switched from the injection position to the waste discharge position.

[0069] Combination Figure 7 As shown, when the valve rotor 12 is in the waste discharge position, the injector is in the waste discharge state, the second inlet hole 7b, the first rotor slot 22, the third outlet hole 4b and the third outlet port 4a form a waste discharge channel, the first stator slot 21 is connected to the waste discharge channel, and part of the mobile phase pumped by the system pump connected to the second inlet port 7a will flow through the first rotor slot 22 to flush out the sample or dirt that may remain therein, thereby ensuring the accuracy and reliability of the injector in subsequent analysis.

[0070] Specifically, in this embodiment, the first rotor slot 22, the second rotor slot 23 and the third rotor slot 24 are all straight slots. In other embodiments, any one, any two or all three of the first rotor slot 22, the second rotor slot 23 and the third rotor slot 24 are arcuate slots, and the rest are straight slots. The inner arc of the arcuate slot is located on the side close to the second inlet hole 7b.

[0071] Similarly, in this embodiment, the first stator slot 21 and the second stator slot 26 are both straight slots. In other embodiments, any one or both of the first stator slot 21 and the second stator slot 26 are arc slots, and the rest are straight slots.

[0072] In other embodiments, a chromatograph is disclosed, comprising the injector in Embodiment 1. Embodiment 2

[0073] Combination Figure 8-14 As shown, the injector in this embodiment includes a valve stator 11 and a valve rotor 12. The first surface 11a of the valve stator 11 is provided with a first outlet port 1a, a second outlet port 3a, a third outlet port 4a, a first inlet port 5a, a second inlet port 7a, a first connection port 2a, and a second connection port 6a. The second surface 11b' of the valve stator 11 is provided with a first outlet hole 1b' communicating with the first outlet port 1a, a second outlet hole 3b' communicating with the second outlet port 3a, a third outlet hole 4b' communicating with the third outlet port 4a, and a first inlet port 5a, a second inlet port 7a, a first connection port 2a, and a second connection port 6a. The first inlet hole 5b` connected to the port 5a, the second inlet hole 7b` connected to the second inlet port 7a, the first connecting hole 2b` connected to the first connecting port 2a, and the second connecting hole 6b` connected to the second connecting port 6a, the second inlet hole 7b` is positioned at the center of the inner stator surface, and the center of the inner stator surface is located on the rotation axis 13 line of the valve rotor 12, and the first outlet hole 1b`, the second outlet hole 3b`, the third outlet hole 4b`, the first inlet hole 5b`, the first connecting hole 2b` and the second connecting hole 6b` are distributed on a circle with the center of the inner stator surface.

[0074] Further, in this embodiment, the valve stator 11 and the valve rotor 12 both have a first surface 11a and a second surface 11b' opposite to each other, the first surface 11a of the valve stator 11 is located at its outer end, and the second surface 11b' of the valve stator 11 faces the first surface 12a of the valve rotor 12. The rotating shaft of the driving unit 14 is connected to one end of the rotating shaft 13, and the other end of the rotating shaft 13 is fixedly connected to the second surface 11b' of the valve rotor 12. The driving unit 14 drives the valve rotor 12 to rotate relative to the valve stator 11 through the rotating shaft 13.

[0075] Further, in this embodiment, the first connection port 2a and the second connection port 6a are respectively used to connect one end of the injection loop 25'. The first outlet port 1a is used to connect to an external chromatography column, and the third outlet port 4a is used to connect to an external waste liquid container. The first inlet port 5a is connected to an injection device, such as a syringe or a sample pump.

[0076] Combination Figure 8As shown, in this embodiment, the first outlet hole 1b', the first connection hole 2b', the second outlet hole 3b', the third outlet hole 4b', the first inlet hole 5b' and the second connection hole 6b' are all distributed in sequence at equal angles and equal distances with the axis of the second inlet hole 7b' as the center. Correspondingly, since the first outlet hole 1b' and the first outlet port 1a, the first connection hole 2b' and the first connection port 2a, the second outlet and the second outlet port 3a, the third outlet hole 4b' and the third outlet port 4a, the first inlet hole 5b' and the first inlet port 5a, the second connection hole 6b' and the second connection port 6a, and the second inlet hole 7b' and the second inlet port 7a are all coaxially arranged. Therefore, the first outlet port 1a, the first connection port 2a, the second outlet port 3a, the third outlet port 4a, the first inlet port 5a and the second connection port 6a are all distributed in sequence at equal angles and equal distances with the axis of the second inlet port 7a as the center.

[0077] Furthermore, combined with Figure 8-9 As shown, the second surface 11b' of the valve stator 11 is further provided with a first stator slot 21' communicating with the third outlet hole 4b', and the first surface 12a of the valve rotor 12 includes a first rotor slot 22', a second rotor slot 23' and a third rotor slot 24', and these three slots are arranged as follows:

[0078] Combination Fig.10 As shown, when the valve rotor 12 is located at the sample loading position: the first rotor groove 22' connects the second inlet hole 7b' with the first outlet hole 1b', the second rotor groove 23' connects the first inlet hole 5b' with the second connecting hole 6b', and the first stator groove 21' connects the first connecting hole 2b' with the third outlet hole 4b' through the third rotor groove 24';

[0079] Combination Fig.11 As shown, when the valve rotor 12 is located at the injection position: the first rotor slot 22' connects the second inlet hole 7b' with the first connecting hole 2b', the second rotor slot 23' connects the first outlet hole 1b' with the second connecting hole 6b', and the first stator slot 21' is staggered with the first connecting hole 2b', the second inlet hole 7b' and the first rotor slot 22';

[0080] Combination Fig.12 As shown, when the valve rotor 12 is located at the waste discharge position: the first rotor groove 22' connects the second inlet hole 7b' with the third outlet hole 4b', and the second rotor groove 23' and the third rotor groove 24' are staggered with the first outlet hole 1b'.

[0081] Specifically, the second surface 11b' of the valve stator 11 is also provided with a second stator slot 26 connected to the second outlet hole 3b'. When the valve rotor 12 is in the fourth rotor position: the second stator slot 26 connects the second outlet hole 3b' with the first outlet hole 1b' through the third rotor slot 24'. When the optimized injector is in the fourth rotor position, the second outlet port 3a is used for an external injection device. The second outlet port 3a, the second outlet hole 3b', the second stator slot 26, the third rotor slot 24', the first outlet hole 1b' and the first outlet port 1a are combined to form a passage. The injection device can directly pump the sample to be analyzed into the chromatography column through the passage. Fig.13 As shown, when the valve rotor 12 is located at the fourth rotor position, the first rotor slot 22' connects the second inlet hole 7b' with the second connecting hole 6b'. Fig.14 As shown, when the valve rotor 12 is located at the fifth rotor position, the second rotor slot 23' connects the second outlet hole 3b' with the third outlet hole 4b'. The shortest distance between the first outlet hole 1b' and the second outlet hole 3b' is L1, the shortest distance between the two ends of the third rotor slot 24' is L2, that is, the straight-line distance between the two ends of the third rotor slot 24' is L2, L2<L1, the shortest distance between the first outlet hole 1b' and the second outlet hole 3b' is L1, and the shortest distance between the two ends of the first stator slot 21' is L3, that is, the straight-line distance between the two ends of the first stator slot 21' is L3, L3<L1.

[0082] In other embodiments, a chromatograph is disclosed, comprising the injector of Embodiment 2.

[0083] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0084] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0085] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0086] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A sample injector, comprising a valve stator (11) and a valve rotor (12); Features: The second surface (11b) of the valve stator (11) is further provided with a first stator groove (21, 21') communicating with the third outlet hole (4b, 4b'). When the valve rotor (12) is in the injection position: The first stator slot (21, 21') on the valve rotor (12) is staggered with the first connecting hole (2b, 2b'), the second inlet hole (7b) and the first rotor slot (22, 22'); When the valve rotor (12) is in the exhaust position: The second rotor groove (23, 23') and the third rotor groove (24, 24') on the valve rotor (12) are both staggered with the first outlet hole (1b, 1b').

2. A sample injector according to claim 1, characterized in that: The second surface (11b) of the valve stator (11) is further provided with a second stator groove (26) communicating with the second outlet hole (3b'). When the valve rotor (12) is in the fourth rotor position: The second stator slot (26) connects the second outlet hole (3b') with the first outlet hole (1b, 1b') via the third rotor slot (24').

3. A sample injector according to claim 2, characterized in that: When the valve rotor (12) is located at the fourth rotor position, the first rotor slot (22') connects the second inlet hole (7b') with the second connecting hole (6b').

4. A sample injector according to claim 2, characterized in that: When the valve rotor (12) is located at the fifth rotor position, the second rotor groove (23') connects the second outlet hole (3b') with the third outlet hole (4b').

5. A sample injector according to claim 1, characterized in that: The first rotor slot (22, 22') is a straight slot or an arc slot; and / or the second rotor slot (23, 23') is a straight slot or an arc slot; And / or the third rotor slot (24, 24') is a straight slot or an arc slot.

6. A sample injector according to claim 1, characterized in that: The first outlet hole (1b, 1b`), the first connecting hole (2b, 2b`), the second outlet hole (3b, 3b`), the third outlet hole (4b, 4b`), the first inlet hole (5b, 5b`) and the first connecting hole (2b, 2b`) on the valve stator (11) are all distributed in sequence at equal angles and at equal distances with the axis of the second inlet hole (7b, 7b`) as the center.

7. A sample injector according to claim 6, characterized in that: The shortest distance between the first outlet hole (1b, 1b') and the second outlet hole (3b, 3b') is L1, and the shortest distance between two ends of the third rotor slot (24, 24') is L2, L2<L1; And / or the shortest distance between the first outlet hole (1b, 1b') and the second outlet hole (3b, 3b') is L1, the shortest distance between the two ends of the first stator slot (21, 21') is L3, and L3<L1.

8. The sample injector according to claim 1, characterized in that: The first stator slots (21, 21') are straight slots or arc-shaped slots.

9. A sample injector according to claim 2, characterized in that: The second stator slot (26) is a straight slot or an arc slot.

10. A chromatograph, characterized in that: A sample injector comprising any one of claims 1-9.

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