Sample injection device and sample injector

Abstract

The utility model relates to the technical field of sample injection equipment, in particular to a sample injection device and a sample injector. The sample introduction device comprises a sample introduction cavity and a sample introduction rod, the sample introduction rod is rotatably connected to the sample introduction cavity, a sealing structure is arranged between the sample introduction rod and the sample introduction cavity, the sample introduction cavity is provided with a sample introduction channel, and one end of the sample introduction rod extends into the sample introduction channel to seal the sample introduction channel; the sample introduction rod is provided with a sample introduction hole, and when the sample introduction rod rotates until the sample introduction hole directly faces the sample introduction channel, a sample in the sample introduction channel falls out of the sample introduction channel from the sample introduction hole to complete sample introduction. The sample introduction rod of the sample introduction device provided by the utility model is always in a sealed state, pressure relief and other airflow fluctuations do not exist in the whole sample introduction process, and the pressure change is not generated, so that the flow stability in the sample introduction process is ensured, and the stability of a thermal conductivity detector is also ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sample injection equipment, in particular to a sample injection device and a sample injector. Background Art

[0002] The existing Dumas nitrogen analyzer sampler adopts pneumatic injection or injection rod injection. Both of these injection methods will stop the gas and release the pressure to achieve sample injection. It is impossible to maintain the seal during the injection process, which will lead to unstable pressure and flow fluctuations, affecting the stability of the thermal conductivity detector. Utility Model Content

[0003] The utility model aims to provide a sample injection device and a sample injector to alleviate the problem that the existing sample injector cannot maintain sealing during the whole process of sample injection, resulting in unstable pressure, causing flow fluctuation and affecting the stability of the thermal conductivity detector.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0005] In a first aspect, the utility model provides a sampling device, comprising: a sampling cavity and a sampling rod, wherein the sampling rod is rotatably connected to the sampling cavity, a sealing structure is arranged between the sampling rod and the sampling cavity, the sampling cavity is provided with a sampling channel, and one end of the sampling rod extends into the sampling channel to seal the sampling channel;

[0006] The injection rod is provided with an injection hole. When the injection rod is rotated until the injection hole faces the injection channel, the sample in the injection channel falls out of the injection channel from the injection hole to complete the injection.

[0007] Furthermore,

[0008] The top wall of the injection cavity is provided with an injection port, and the injection port penetrates the injection cavity along a first direction to form the injection channel.

[0009] Furthermore,

[0010] The sealing structure comprises a first sealing member arranged at the injection channel, wherein the first sealing member is arranged between the injection cavity and the injection rod along the circumference of the injection channel.

[0011] Furthermore,

[0012] The sealing structure further comprises a plurality of second sealing members, which are arranged between the injection cavity and the injection rod at intervals along the axial direction of the injection rod.

[0013] Furthermore,

[0014] The sample injection device further comprises a rotary motor, which is arranged at one end of the sample injection rod away from the sample injection cavity, and is connected to the sample injection rod via a connecting shaft.

[0015] Furthermore,

[0016] The first side wall of the injection cavity is provided with a cover plate, and each corner of the cover plate is connected to the injection cavity through fasteners.

[0017] Furthermore,

[0018] The second side wall of the injection cavity is provided with an exhaust hole for exhausting the air in the injection channel, and the second side wall is perpendicular to the first side wall.

[0019] Furthermore,

[0020] The second side wall of the injection cavity is also provided with a purge connector and a carrier gas connector.

[0021] Furthermore,

[0022] The bottom of the injection cavity is connected with a combustion tube, the combustion tube is communicated with the injection channel, and a sealing ring is arranged between the combustion tube and the injection cavity.

[0023] In a second aspect, the utility model provides a sample injector, comprising the sample injector device described in the first aspect.

[0024] The utility model brings at least the following beneficial effects:

[0025] The utility model provides an injection device, comprising: an injection cavity and an injection rod, the injection rod is rotatably connected to the injection cavity, a sealing structure is arranged between the injection rod and the injection cavity, the injection cavity is provided with an injection channel, one end of the injection rod extends into the injection channel to seal the injection channel; the injection rod is provided with an injection hole, when the injection rod is rotated to the injection hole facing the injection channel, the sample in the injection channel falls out of the injection hole from the injection channel to complete the injection.

[0026] The sample enters the injection cavity from the injection channel, and then the injection rod starts to rotate. When the injection rod rotates to the injection hole facing the injection channel, the sample falls out of the injection hole, thus completing the injection. Since a sealing structure is provided between the injection rod and the injection cavity, the injection rod is always in a sealed state. There is no pressure relief and other air flow fluctuations during the entire injection process, and no pressure changes occur, thereby ensuring the stability of the flow rate during the injection process, and thus ensuring the stability of the thermal conductivity detector.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 Schematic diagram of the sample injection device provided in Example 1 of the utility model Figure 1 ;

[0030] Figure 2 Schematic diagram of the sample injection device provided in Example 1 of the utility model Figure 2 .

[0031] icon:

[0032] 100-injection chamber; 110-injection port; 200-injection rod; 210-injection hole; 300-first seal; 400-second seal; 500-rotating motor; 510-connecting shaft; 600-cover plate; 610-fastener; 700-exhaust hole; 810-purge connector; 820-carrier gas connector; 900-combustion tube. DETAILED DESCRIPTION

[0033] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, if not separately marked, should be understood as basic quantities of the basic units of the International System of Units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0036] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The following is a detailed description of some embodiments of the present invention in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Figure 1 Schematic diagram of the sample injection device provided in Example 1 of the utility model Figure 1 ; Figure 2 Schematic diagram of the sample injection device provided in Example 1 of the utility model Figure 2 .

[0039] Embodiment 1

[0040] Existing samplers use pneumatic injection or injection rod injection. Both of these injection methods require gas stop and pressure relief to achieve sample injection. They cannot maintain a seal throughout the injection process, which will lead to unstable pressure and flow fluctuations, affecting the stability of the thermal conductivity detector.

[0041] In view of this, an embodiment of the utility model provides an injection device, comprising: an injection chamber 100 and an injection rod 200, the injection rod 200 is rotatably connected to the injection chamber 100, a sealing structure is arranged between the injection rod 200 and the injection chamber 100, the injection chamber 100 is provided with an injection channel, one end of the injection rod 200 extends into the injection channel to seal the injection channel; the injection rod 200 is provided with an injection hole 210, when the injection rod 200 rotates until the injection hole 210 is facing the injection channel, the sample in the injection channel falls out of the injection channel from the injection hole 210 to complete the injection.

[0042] The sample enters the injection cavity 100 from the injection channel, and then the injection rod 200 starts to rotate. When the injection rod 200 rotates to the injection hole 210 facing the injection channel, the sample falls out of the injection channel from the injection hole 210, thereby completing the injection. Since a sealing structure is provided between the injection rod 200 and the injection cavity 100, the injection rod 200 is always in a sealed state, and there is no pressure relief and other air flow fluctuations during the entire injection process, and no pressure changes will occur, thereby ensuring the stability of the flow rate during the injection process, and also ensuring the stability of the thermal conductivity detector.

[0043] It should be noted that the structure of the injection rod 200 can be cylindrical, spherical, elliptical, etc., and this embodiment is described by taking a cylindrical injection rod 200 as an example.

[0044] In an optional manner of this embodiment, a top wall of the injection chamber 100 is provided with an injection port 110 , and the injection port 110 penetrates the injection chamber 100 along a first direction to form an injection channel.

[0045] See also Figure 1 The first direction is the height direction of the injection chamber 100 , and the injection port 110 penetrates from the top to the bottom along the height direction of the injection chamber 100 , thereby forming an injection channel.

[0046] In an optional manner of this embodiment, the sealing structure includes a first sealing member 300 disposed at the injection channel. The first sealing member 300 is disposed between the injection cavity 100 and the injection rod 200 along the circumference of the injection channel.

[0047] See also Figure 1 The first sealing member 300 seals the injection rod 200 and the injection chamber 100 from the circumference of the injection channel. The first sealing member 300 is preferably a square sealing member.

[0048] In an optional manner of this embodiment, the sealing structure further includes a plurality of second sealing members 400 , and the second sealing members 400 are arranged between the injection cavity 100 and the injection rod 200 at intervals along the axial direction of the injection rod 200 .

[0049] Please continue to see Figure 1The second sealing member 400 seals the injection rod 200 and the injection chamber 100 from the circumferential direction of the injection rod 200. The second sealing member 400 is preferably an O-ring. A plurality of O-rings are arranged at intervals along the axial direction of the injection rod 200 to achieve a better sealing effect.

[0050] The structure of the first sealing member 300 and the plurality of second sealing members 400 ensures that the injection rod 200 is always in a sealed state during the injection process, and does not generate pressure changes, thereby ensuring the stability of the flow rate during the injection process.

[0051] In an optional manner of this embodiment, the injection device further includes a rotary motor 500 , which is disposed at one end of the injection rod 200 away from the injection chamber 100 , and is connected to the injection rod 200 via a connecting shaft 510 .

[0052] See also Figure 1 The rotary motor 500 is connected to the connecting shaft 510 through a flat key, and the connecting shaft 510 is connected to the injection rod 200 through a concave-convex groove structure. During the injection process, the rotation of the rotary motor 500 drives the connecting shaft 510 to start rotating, and the connecting shaft 510 further drives the injection rod 200 to rotate.

[0053] In an optional manner of this embodiment, a cover plate 600 is disposed on the first side wall of the injection chamber 100 , and the cover plate 600 is connected to the injection chamber 100 at each corner via a fastener 610 .

[0054] See also Figure 1 The injection chamber 100 and the cover plate 600 are connected and fixed by countersunk screws at four corners, and the injection rod 200 can rotate smoothly in the injection chamber 100 by adjusting the tightness of the four countersunk screws.

[0055] In an optional manner of this embodiment, the second side wall of the injection chamber 100 is provided with an exhaust hole 700 for exhausting the air in the injection channel, and the second side wall is perpendicular to the first side wall.

[0056] See also Figure 2 The exhaust hole 700 is disposed at the top of the second side wall of the injection chamber 100 , and the exhaust hole 700 can exhaust the air in the injection channel to the outside of the injection chamber 100 .

[0057] Furthermore, a purge connector 810 and a carrier gas connector 820 are also provided on the second side wall of the injection chamber 100 .

[0058] Please continue to see Figure 2 During the injection process, the gas in the injection channel is purged through the purge connector 810, and then the impurity gas is discharged through the exhaust hole 700. The carrier gas connector 820 is connected to the injection chamber 100 through threads, and a sealing gasket is used in the middle to achieve sealing.

[0059] In an optional manner of this embodiment, a combustion tube 900 is connected to the bottom of the injection chamber 100 , the combustion tube 900 is communicated with the injection channel, and a sealing ring is provided between the combustion tube 900 and the injection chamber 100 .

[0060] See also Figure 1 The injection cavity 100 is connected to the combustion tube 900 by threads, and a sealing ring is used to seal the two. The sample in the injection channel falls out of the injection channel from the injection hole 210 and enters the combustion tube 900.

[0061] The injection process of the injection device provided in this embodiment is as follows:

[0062] The sample falls from the injection port 110 into the injection channel in the injection chamber 100, and the rotary motor 500 starts to rotate, driving the connecting shaft 510 to start rotating, and the connecting shaft 510 then drives the injection rod 200 to rotate. When the injection rod 200 rotates 90°, the rotary motor 500 stops rotating, and the exhaust hole 700 starts exhausting, exhausting the air in the injection channel, and the time lasts for about 10 seconds. After 10 seconds, the rotary motor 500 continues to rotate, and after the injection rod 200 continues to rotate 90°, the sample falls out of the injection channel through the injection hole 210 and enters the combustion tube 900. At this time, one injection cycle is completed, and there is no pressure relief or other air flow fluctuations in the whole process.

[0063] The sample injection device drives the sample injection rod 200 to rotate by the rotating motor 500, and sends the sample into the test system. The structure is reliable and the subsequent maintenance cost is low. During the rotation of the sample injection rod 200, since the sample injection rod 200 is always in a sealed state, there will be no pressure fluctuation during the entire sample injection process, and the baseline of the instrument detector will not be changed.

[0064] Embodiment 2

[0065] The embodiment of the utility model provides a sample injector, including the sample injecting device of embodiment 1. Since the sample injector includes all the structures of the sample injecting device, it has all the beneficial effects of embodiment 1, which will not be described in detail here.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A sample injection device, characterized in that: include: An injection cavity and an injection rod, wherein the injection rod is rotatably connected to the injection cavity, a sealing structure is provided between the injection rod and the injection cavity, the injection cavity is provided with an injection channel, and one end of the injection rod extends into the injection channel to seal the injection channel; The injection rod is provided with an injection hole. When the injection rod is rotated until the injection hole faces the injection channel, the sample in the injection channel falls out of the injection channel from the injection hole to complete the injection.

2. The sample injection device according to claim 1, characterized in that: The top wall of the injection cavity is provided with an injection port, and the injection port penetrates the injection cavity along a first direction to form the injection channel.

3. The sample injection device according to claim 2, characterized in that: The sealing structure comprises a first sealing member arranged at the injection channel, wherein the first sealing member is arranged between the injection cavity and the injection rod along the circumference of the injection channel.

4. The sample injection device according to claim 3, characterized in that: The sealing structure further comprises a plurality of second sealing members, which are arranged between the injection cavity and the injection rod at intervals along the axial direction of the injection rod.

5. The sample injection device according to claim 1, characterized in that: The sample injection device further comprises a rotary motor, which is arranged at one end of the sample injection rod away from the sample injection cavity, and is connected to the sample injection rod via a connecting shaft.

6. The sample injection device according to claim 1, characterized in that: The first side wall of the injection cavity is provided with a cover plate, and each corner of the cover plate is connected to the injection cavity through fasteners.

7. The sample injection device according to claim 6, characterized in that: The second side wall of the injection cavity is provided with an exhaust hole for exhausting the air in the injection channel, and the second side wall is perpendicular to the first side wall.

8. The sample injection device according to claim 7, characterized in that: The second side wall of the injection cavity is also provided with a purge connector and a carrier gas connector.

9. The sample injection device according to claim 1, characterized in that: The bottom of the injection cavity is connected with a combustion tube, the combustion tube is communicated with the injection channel, and a sealing ring is arranged between the combustion tube and the injection cavity.

10. A sample injector, characterized in that: Comprising the sampling device as described in any one of claims 1-9.

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