Valve device for controlling carrier gas to cross purge soil sample

Abstract

The invention discloses a valve device for controlling carrier gas to cross purge a soil sample, and particularly relates to the field of gas valves, which comprises a nitrogen gas inlet valve mechanism and a helium gas inlet valve mechanism, the helium gas inlet valve mechanism comprises a gas inlet cylinder, a gas sealing plate, a fixed cylinder, a sleeve plate and a helium gas sealing assembly for driving the gas sealing plate to rotate; the nitrogen inlet valve mechanism comprises a ventilation cylinder, a nitrogen sealing assembly and a rotating wheel; the gas sealing plate is fixed to the side end of the fixed cylinder, the sleeve plate is provided with a sliding groove matched with the gas sealing plate to be slidably arranged in, and the sleeve plate is fixed to the inner side end of the gas inlet cylinder; meshing teeth are arranged on the side edge of the upper end of the fixed cylinder and are in meshing transmission connection with the rotating wheel, and transmission teeth meshed with the rotating wheel are arranged on the side edge of the upper end of the ventilation cylinder. The valve device has the advantages that helium or nitrogen is selectively introduced, and when the helium channel is opened, the nitrogen channel is correspondingly closed at the same time.

Description

Technical Field

[0001] The present application relates to the field of gas valves, and in particular to a valve device for controlling carrier gas cross-purge of soil samples. Background Art

[0002] Chinese invention patent CN202010204188.7 discloses a volatile analyte enricher that can be cross-purged with nitrogen and helium and its application in soil sample detection. In this scheme, a switching device is used to control the introduction of nitrogen and helium, thereby purging volatile analytes in the sample.

[0003] However, mixing nitrogen and helium for a short time has no effect, but if they are mixed for a long time, it is easy to cause peak broadening or tailing (more obvious in polar columns). In the above patent solution, the helium is controlled by the pressure change of the gas inside the container. This will cause helium and nitrogen to be used for a long time during the purging of volatiles in soil samples, which will not only damage the instrument, but also inaccurate test results. Summary of the invention

[0004] The invention provides a valve device for controlling carrier gas cross-purge of soil samples. The valve device has the advantages of selectively introducing helium or nitrogen, and when the helium channel is opened, the nitrogen channel is correspondingly closed at the same time.

[0005] The objective of the present invention is achieved through the following technical solutions: A valve device for controlling carrier gas cross-purge of soil samples, comprising a nitrogen inlet valve mechanism and a helium inlet valve mechanism; The helium inlet valve mechanism includes an inlet cylinder, a sealing plate, a fixed cylinder, a sleeve plate and a helium sealing assembly that drives the sealing plate to rotate; the nitrogen inlet valve mechanism includes a ventilation cylinder, a nitrogen sealing assembly and a rotating wheel; the sealing plate is fixed to the side end of the fixed cylinder, the sleeve plate is provided with a slide groove adapted to the sliding insertion of the sealing plate, and the sleeve plate is fixed to the inner end of the inlet cylinder; the upper end side edge of the fixed cylinder is provided with meshing teeth, the meshing teeth and the rotating wheel are meshed and driven, and the upper end side edge of the ventilation cylinder is provided with transmission teeth that mesh with the rotating wheel.

[0006] Among them, the mechanical interlocking of the helium / nitrogen channels is achieved through gear meshing, ensuring that the nitrogen channel is forced to close when the helium channel is opened, completely avoiding the risk of long-term gas mixing.

[0007] Preferably, the helium sealing assembly comprises a slide rail, a slide block, a connecting rod, a slide end and a slide column; The slide rail is provided with a slide groove adapted to the sliding of the sliding block, one end of the connecting rod is rotatably connected to the sliding block, and the other end is rotatably connected to the sliding end head, a sliding column is fixed on the slide rail, and the sliding end head is slidably connected to the sliding column.

[0008] Among them, by controlling the sliding block to press against the inner wall of the fixed cylinder, the sealing plate is rotated and placed in the sliding groove on the sleeve plate, thereby realizing the opening and closing control of helium.

[0009] Preferably, the helium sealing assembly further comprises a rotating handle, a connecting block and an elastic member; The connecting block is rotatably connected to the sliding end, and the rotating handle is fixed to the connecting block; one end of the elastic member is fixed to the sliding end, and the other end is fixed to the upper end of the sliding column.

[0010] Preferably, a side end of the sliding end is provided with an annular sliding groove, and the connecting block is provided with a protrusion sliding in the annular sliding groove.

[0011] Preferably, a limiting rib is provided on the side end of the sliding column, and correspondingly, a limiting groove is provided on the inner side of the sliding end head.

[0012] Preferably, a rotation groove adapted to the rotation of a rotating handle is provided at the side end of the air intake cylinder.

[0013] Preferably, a sealing plate is provided inside the air inlet cylinder, and the helium channel is connected to the sealing plate.

[0014] Preferably, the nitrogen sealing assembly comprises a slide rail and a sealing block; The air-blocking block is arranged in the slide rail; the upper end of the ventilator is provided with an arc-shaped sliding groove and a nitrogen channel; the air-blocking block is provided with a sliding block, and the sliding block is slidably arranged in the arc-shaped sliding groove.

[0015] The vent cylinder is rotated by the transmission of the rotating wheel, so that the air-blocking block and the arc-shaped sliding groove move, thereby closing the nitrogen passage.

[0016] Preferably, a nitrogen pipe is threadedly connected to the lower end of the nitrogen passage.

[0017] Preferably, the valve device further comprises an outer shell, and the nitrogen intake valve mechanism and the helium intake valve mechanism are fixedly mounted inside the outer shell.

[0018] Compared with the prior art, the advantages or beneficial effects of the technical solution of the present application include: 1. The helium inlet valve mechanism is used to control the on and off of helium, and the nitrogen inlet valve mechanism is used to control the on and off of nitrogen. The gear meshing between the two realizes the mechanical interlocking of the helium / nitrogen channels, physically isolates the two gas channels, and ensures that the nitrogen channel is forced to close when the helium channel is opened, completely avoiding the risk of long-term gas mixing.

[0019] 2. By switching between nitrogen and helium for single use, the present application avoids the chromatographic peak broadening and tailing caused by the mixing of the two gases (experimental data show that the peak tailing rate is reduced by >80%); and the polar / non-polar chromatographic columns are adapted to avoid the mixed gas from damaging the surface coating of the chromatographic column, thereby extending the life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional structural diagram of a valve device for controlling carrier gas cross-purge of soil samples; Figure 2 It is a three-dimensional structural diagram of a nitrogen intake valve mechanism and a helium intake valve mechanism; Figure 3 It is a three-dimensional structural diagram of the helium intake valve mechanism; Figure 4 for Figure 3 A magnified view of part A in FIG. Figure 5 It is a back structural diagram of a nitrogen intake valve mechanism and a helium intake valve mechanism; Figure 6 A cross-sectional view of the nitrogen intake valve mechanism.

[0021] In the figure: 1. rotating handle, 2. helium channel, 4. sealing plate, 5. air inlet cylinder, 6. slide groove, 7. sealing plate, 8. rotating groove, 11. elastic member, 12. sliding column, 13. connecting block, 15. sliding end, 16. connecting rod, 17. sliding block, 18. slide rail, 19. sleeve plate, 20. meshing teeth, 21. fixed cylinder, 22. rotating wheel, 23. slide rail, 24. nitrogen pipe, 25. transmission teeth, 27. outer shell, 28. air sealing block, 29. arc-shaped sliding groove, 30. slider, 31. ventilator. DETAILED DESCRIPTION

[0022] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present application applies technical means to solve technical problems and achieve corresponding technical effects can be fully understood and implemented accordingly. The embodiments of the present application and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the protection scope of the present application.

[0023] It should be clear that the embodiments described below are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by technicians in the relevant field without making creative work are within the scope of protection of the present application. Example 1

[0024] This embodiment describes the valve device in detail: like Figure 1-Figure 6 As shown, a valve device for controlling carrier gas cross-purge of soil samples is characterized by comprising a nitrogen inlet valve mechanism and a helium inlet valve mechanism; The helium inlet valve mechanism includes an inlet cylinder 5, a sealing plate 4, a fixed cylinder 21, a sleeve plate 19 and a helium sealing assembly that drives the sealing plate 4 to rotate; the nitrogen inlet valve mechanism includes a ventilation cylinder 31, a nitrogen sealing assembly and a rotating wheel 22; the sealing plate 4 is fixed to the side end of the fixed cylinder 21, the sleeve plate 19 is provided with a slide groove 6 adapted to the sliding insertion of the sealing plate 4, and the sleeve plate 19 is fixed to the inner end of the inlet cylinder 5; the upper end side edge of the fixed cylinder 21 is provided with meshing teeth 20, the meshing teeth 20 and the rotating wheel 22 are meshed and driven, and the upper end side edge of the ventilation cylinder 31 is provided with transmission teeth 25 that mesh with the rotating wheel 22.

[0025] The internal component connection relationship and working principle of the helium intake valve mechanism are as follows: Among them, Figure 3 and Figure 4 As shown, the function of the helium sealing assembly is to control the rotation of the fixed cylinder 21, thereby driving the sealing plate 4 fixed thereto to rotate, and thus rotating into the slide groove 6 on the sleeve plate 19. At this time, the helium connected below the air inlet cylinder 5 will flow out from the gap between the fixed cylinder 21 and the air inlet cylinder 5 until it enters the helium channel 2, thereby purging the soil sample. Example 2

[0026] This embodiment describes the structure of the helium gas sealing assembly in detail based on the embodiment 1: The helium sealing assembly includes a slide rail 18, a sliding block 17, a connecting rod 16, a sliding end 15, a sliding column 12, a rotating handle 1, a connecting block 13 and an elastic member 11; the slide rail 18 is provided with a slide groove adapted to the sliding of the sliding block 17, one end of the connecting rod 16 is rotatably connected to the sliding block 17, and the other end is rotatably connected to the sliding end 15, the slide rail 18 is fixed with a sliding column 12, and the sliding end 15 is slidably connected to the sliding column 12. The connecting block 13 is rotatably connected to the sliding end 15, and the rotating handle 1 is fixed to the connecting block 13; one end of the elastic member 11 is fixed to the sliding end 15, and the other end is fixed to the upper end of the sliding column 12.

[0027] The side end of the sliding end 15 is provided with an annular groove, and the connecting block 13 is provided with a convex block sliding in the annular groove. The side end of the sliding column 12 is provided with a limiting rib, and correspondingly, the inner side of the sliding end 15 is provided with a corresponding limiting groove. The side end of the air inlet cylinder 5 is provided with a rotating groove 8 adapted to the rotation of the rotating handle 1. The interior of the air inlet cylinder 5 is provided with a sealing plate 7, and the helium channel 2 is connected to the sealing plate 7.

[0028] like Figure 3 and Figure 4As shown, when the rotating handle 1 drives the sliding end 15 to move downward, it will drive one end of the connecting rod 16 to move downward, so that the other end of the connecting rod 16 will laterally push the sliding block 17 to slide along the slide rail 18 until the sliding block 17 and the inner side wall of the fixed cylinder 21 are tightly fixed, so that when the rotating handle 1 is rotated, the fixed cylinder 21 can rotate synchronously (the fixed cylinder 21 and the sleeve plate 19 are rotationally connected, and the fixed cylinder 21 and the sealing plate 7 are rotationally connected). Therefore, as long as the rotating handle 1 is embedded in the rotating groove 8 and the rotating handle 1 is rotated, the fixed cylinder 21 can be driven to rotate, thereby controlling the gas to enter the helium channel 2. Example 3

[0029] This embodiment describes the specific structure of the nitrogen gas sealing assembly based on Embodiment 1 and Embodiment 2: The nitrogen sealing assembly includes a slide rail 23 and a gas-blocking block 28; the gas-blocking block 28 is arranged in the slide rail 23; the upper end of the ventilator 31 is provided with an arc-shaped sliding groove 29 and a nitrogen passage, the gas-blocking block 28 is provided with a slider 29, and the slider 29 is slidably arranged in the arc-shaped sliding groove 29. The lower end of the nitrogen passage is screwed with a nitrogen pipe 24.

[0030] This embodiment further includes an outer shell 27 , and a nitrogen intake valve mechanism and a helium intake valve mechanism are fixedly installed inside the outer shell 27 .

[0031] The internal connection relationship and working principle of the nitrogen sealing assembly are as follows: like Figure 5 and Figure 6 As shown, when the fixed cylinder 21 rotates, the meshing transmission between the meshing teeth 20 and the rotating wheel 22 drives the upper end portion of the breather cylinder 31 to rotate. In this embodiment, the slide rail 23 and the upper side of the breather cylinder 31 are rotationally connected, that is, when the breather cylinder 31 rotates, the slide rail 23 does not rotate synchronously therewith. The purpose of the above arrangement is that when the arc-shaped sliding groove 29 provided at the inner side end of the breather cylinder rotates, the slider 30 can be driven to slide out of or into the slide rail 23. When the sliders 30 on both sides slide out, they can block the air holes (nitrogen channels) on the breather cylinder. Please refer to the above content. Figure 5 shown.

[0032] In order to achieve the purpose described in the present invention, Figure 5 In the figure, although the breather cylinder 31 is described as a whole, in fact, the breather cylinder 31 is split into two ends, and the upper end of the slide rail 23 is rotatably connected to the upper side of the breather cylinder 31. The main purpose is that when the arc-shaped sliding groove 29 on the inner side of the breather cylinder 31 rotates, the slider 30 fixed to the upper end of the air-blocking block 28 is driven to slide along the arc-shaped sliding groove 29, so that the air-blocking block 28 slides out of the slide rail groove in the slide rail 23, thereby achieving the purpose of blocking the nitrogen channel.

Claims

1. A valve device for controlling carrier gas cross-purge of soil samples, characterized in that: including a nitrogen intake valve mechanism and a helium intake valve mechanism; The helium inlet valve mechanism comprises an inlet cylinder (5), a sealing plate (4), a fixed cylinder (21), a sleeve plate (19) and a helium sealing assembly for driving the sealing plate (4) to rotate; the nitrogen inlet valve mechanism comprises a vent cylinder (31), a nitrogen sealing assembly and a rotating wheel (22); the sealing plate (4) is fixed to the side end of the fixed cylinder (21); the sleeve plate (19) is provided with a slide groove (6) adapted for the sealing plate (4) to slide into; the sleeve plate (19) is fixed to the inner side end of the inlet cylinder (5); the upper side edge of the fixed cylinder (21) is provided with meshing teeth (20), the meshing teeth (20) and the rotating wheel (22) are meshed and transmission-connected; the upper side edge of the vent cylinder (31) is provided with transmission teeth (25) meshed with the rotating wheel (22).

2. A valve device for controlling carrier gas cross-purge of soil samples according to claim 1, characterized in that: The helium sealing assembly comprises a slide rail (18), a sliding stop block (17), a connecting rod (16), a sliding end (15) and a sliding column (12); The slide rail (18) is provided with a slide groove adapted to slide the slide block (17); one end of the connecting rod (16) is rotatably connected to the slide block (17), and the other end is rotatably connected to the slide end (15); a slide column (12) is fixed to the slide rail (18), and the slide end (15) is slidably connected to the slide column (12).

3. A valve device for controlling carrier gas cross-purge of soil samples according to claim 2, characterized in that: The helium sealing assembly also includes a rotating handle (1), a connecting block (13) and an elastic member (11); The connecting block (13) and the sliding end (15) are rotatably connected, and the rotating handle (1) and the connecting block (13) are fixed; One end of the elastic member (11) is fixed to the sliding end (15), and the other end is fixed to the upper end of the sliding column (12).

4. A valve device for controlling carrier gas cross-purge of soil samples according to claim 3, characterized in that: The side end of the sliding end (15) is provided with an annular sliding groove, and the connecting block (13) is provided with a protrusion that slides in the annular sliding groove.

5. A valve device for controlling carrier gas cross-purge of soil samples according to claim 2, characterized in that: The side end of the sliding column (12) is provided with a limiting rib, and correspondingly, the inner side of the sliding end head (15) is provided with a limiting groove.

6. A valve device for controlling carrier gas cross-purge of soil samples according to claim 3, characterized in that: The side end of the air inlet cylinder (5) is provided with a rotation groove (8) adapted to rotate the rotating handle (1).

7. A valve device for controlling carrier gas cross-purge of soil samples according to claim 3, characterized in that: A sealing plate (7) is provided inside the air inlet cylinder (5), and the helium passage (2) is in communication with the sealing plate (7).

8. A valve device for controlling carrier gas cross-purge of soil samples according to claim 3, characterized in that: The nitrogen gas sealing assembly comprises a slide rail (23) and a gas sealing block (28); The air-blocking block (28) is arranged in the slide rail (23); The upper end of the vent cylinder (31) is provided with an arc-shaped sliding groove (29) and a nitrogen passage, and the air-blocking block (28) is provided with a sliding block (30), which is slidably disposed in the arc-shaped sliding groove (29).

9. A valve device for controlling carrier gas cross-purge of soil samples according to claim 8, characterized in that: The lower end of the nitrogen passage is threadedly connected with a nitrogen pipe (24).

10. A valve device for controlling carrier gas cross-purge of soil samples according to claim 1, characterized in that: It also includes an outer shell (27), wherein a nitrogen intake valve mechanism and a helium intake valve mechanism are fixedly mounted inside the outer shell (27).

Images