Disc type sample injector

Abstract

The utility model discloses a disc type sample injector which comprises a shell body, a sample disc, a sampling needle, a first driving unit and a second driving unit are arranged in the shell body, and the sample disc is provided with a plurality of groove positions used for containing reagent cups and can rotate under the action of the first driving unit. The sampling needle can act under the action of the second driving unit so as to extract the reagent in the reagent cup at a set position, and is characterized in that the tail end of the sampling needle comprises a spine part, and at least one liquid passing hole is formed in the conical surface forming the spine part, so that a sample or cleaning liquid can flow through the liquid passing hole. The cleaning device is reasonable in structure, convenient to clean and favorable for improving the cleaning efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of sample preparation, in particular to a disc type sample injector. Background Art

[0002] An injector is a device used to introduce samples into analytical instruments or reaction systems. It is a crucial component in sample testing and is widely used in chromatography (e.g., gas chromatography (GC) and liquid chromatography (HPLC)), mass spectrometry (MS), and other analytical techniques. It typically consists of a sample tray and a sampling needle. To ensure accurate test results, the sampling needle must be cleaned after sampling. In existing technology, sampling needles typically have a small hole at the bottom, resulting in poor cleaning effectiveness. Multiple cleanings are often required to meet experimental requirements, hindering analytical efficiency. Utility Model Content

[0003] The utility model discloses a disc-type sample injector, which solves the technical problem of poor cleaning effect of the sampling needle of the prior art sample injector, which is not conducive to improving analysis efficiency. It has a reasonable structure, is easy to clean, and is conducive to improving the cleaning efficiency. The technical solution adopted is as follows:

[0004] A disc-type sampler includes a shell body, in which a sample disc, a sampling needle, a first drive unit and a second drive unit are arranged. The sample disc is provided with a plurality of slots for accommodating reagent cups and can be rotated under the action of the first drive unit. The sampling needle can be moved under the action of the second drive unit to extract the reagent in the reagent cup at a set position. The end of the sampling needle includes a sharp portion, and at least one liquid hole is provided on the conical surface forming the sharp portion for sample or cleaning liquid to flow through.

[0005] Based on the above technical solution, there are multiple liquid holes and they are evenly arranged in the circumferential direction.

[0006] On the basis of the above technical solution, it also includes a needle washing trough and a cleaning bottle. The needle washing trough includes a vertically extending needle washing chamber. The bottom of the needle washing chamber is connected to the bottom of the cleaning bottle through a connecting tube, and a valve is provided on the connecting tube. When the sampling needle is inserted into the needle washing chamber, the cleaning liquid in the needle washing chamber can surround the sampling needle to clean the inside and outside of the sampling needle.

[0007] Based on the above technical solution, the shell body includes a partition, which includes a vertical plate and a horizontal plate to divide the inner cavity of the shell body into multiple relatively independent chambers, so that the chamber where the sample disk is located is relatively separated from the chamber where the sampling needle and the second drive unit are located, and a long hole for avoiding the sampling needle is provided on the horizontal plate.

[0008] Based on the above technical solution, the long hole extends along the radial direction of the sample disk.

[0009] On the basis of the above technical solution, the needle washing tank and the sample tray are arranged in the same chamber, and the needle washing tank and the cleaning bottle are arranged in different chambers.

[0010] On the basis of the above technical solution, the chamber accommodating the sample tray is provided with an upper opening, and a flip cover is hinged at the opening to facilitate taking and placing the reagent cup.

[0011] On the basis of the above technical solution, the side wall of the chamber accommodating the sample tray includes a curved transparent plate to facilitate viewing of the sampling situation.

[0012] Based on the above technical solution, the sample tray includes an upper orifice plate and a lower orifice plate, the lower orifice plate and the upper orifice plate are fixedly connected by a number of pillars, and the hole positions on the upper orifice plate and the lower orifice plate are arranged one by one to jointly form a slot for accommodating a reagent cup, and a baffle is provided on the upper orifice plate or the lower orifice plate, and an optical coupler is fixed in the chamber where the sample tray is located, and the optical coupler can recognize the baffle and send a signal to the controller.

[0013] On the basis of the above technical solution, it also includes a liquid leakage alarm device and a liquid receiving box. The second driving unit includes a peristaltic pump, which can be connected to the sampling needle through a selection valve. The liquid receiving box is arranged below the inlet and outlet of the peristaltic pump and the selection valve to receive leaked liquid. The probe of the liquid leakage alarm device is close to the inner bottom surface of the liquid receiving box and can send a signal to the controller.

[0014] Beneficial effects

[0015] The utility model has a reasonable structure, and the conical surface of the sharp thorn part at the end of the cleaning needle is provided with multiple liquid holes, which can effectively increase the diameter of the liquid hole, so that the cleaning liquid can quickly enter the sampling needle; when the sampling needle is extended from top to bottom into the needle washing cavity, the inner wall surface and the outer wall surface of the sampling needle are in contact and friction with the cleaning liquid, which can quickly and efficiently complete the cleaning of the inside and outside of the sampling needle, and the cleaning is more thorough and efficient.

[0016] In the utility model, the needle washing trough is vertically arranged and the bottom is connected with the bottom of the cleaning bottle through a connecting pipe, which is roughly U-shaped. In this way, the liquid level in the needle washing trough is level with the liquid level in the cleaning bottle under the action of hydraulic pressure. In addition, a valve is provided on the connecting pipe, with the help of which the connection between the needle washing trough and the cleaning bottle can be cut off, and the waste liquid in the needle washing trough can be discharged outward, and then the needle washing trough and the cleaning bottle are connected again, so that the liquid changing operation is realized simply and easily.

[0017] The utility model's central partition divides the inner chamber of the chassis into multiple relatively independent chambers and separates the sample tray from other components, thus preventing the impact of sample volatilization on other components, which helps to improve the service life and accuracy of analysis results. In addition, the chamber where the sample tray is placed is equipped with a flip cover and a transparent plate, making it easy for workers to remove and place reagent cups and to check the working status at any time, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only one embodiment of the present invention. For those skilled in the art, other implementation drawings can be derived from the provided drawings without inventive effort.

[0019] Figure 1 : Schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 : Schematic diagram of the three-dimensional structure of the utility model after removing part of the shell body;

[0021] Figure 3 : A schematic cross-sectional view of the main view of the sampling needle in the present invention;

[0022] Figure 4 : Schematic diagram of the three-dimensional structure of the needle washing tank and the cleaning bottle after assembly in the utility model; DETAILED DESCRIPTION

[0023] The following description and accompanying drawings sufficiently illustrate the specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for portions and features of other embodiments. The scope of the embodiments herein includes the entire scope of the claims, including all available equivalents thereof. Herein, the terms "first," "second," and the like are used solely to distinguish one element from another and do not require or imply any actual relationship or order between these elements. In practice, the first element can also be referred to as the second element, and vice versa. Furthermore, the terms "comprise," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a structure, device, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such structure, device, or apparatus. Without further limitation, an element defined by the phrase "comprising a..." does not preclude the presence of other identical elements in the structure, device, or apparatus comprising the element. The various embodiments herein are described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. Similar or identical parts between the various embodiments can be referenced to each other.

[0024] The terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used herein to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are intended only to facilitate the description of this document and simplify the description, and are not intended to 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 should not be construed as a limitation on the present invention. In the description herein, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, they can be mechanical or electrical connections, or they can be internal connections between two elements, they can be directly connected, or they can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0025] As used herein, unless otherwise specified, the term "plurality" means two or more.

[0026] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0027] In this article, the term "and / or" is used to describe the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0028] like Figures 1 to 4The disc-type sample injector shown includes a shell body 1, in which a sample tray 2, a sampling needle 3, a first drive unit and a second drive unit 4 are arranged; wherein, a partition 8 is provided in the shell body 1. In this embodiment, the partition 8 includes a plurality of vertical plates and a horizontal plate. The partition 8 divides the inner cavity of the shell body 1 into a plurality of relatively independent chambers, so that the chamber where the sample tray 2 is located is relatively separated from the chamber where the sampling needle 3 and the second drive unit 5 are located, thereby preventing the volatile sample from corroding or damaging the sampling needle 3, the second drive unit 5 or other components; wherein, the chamber accommodating the sample tray 2 is provided with an upper opening, and a flip cover 11 is hinged at the opening to facilitate the staff to take and place the reagent cup. In addition, the side wall of the chamber accommodating the sample tray 2 includes a curved transparent plate 12 to facilitate the staff to check the sampling status of the sampling needle 3 at any time.

[0029] like Figure 2 As shown, the sample tray 2 is provided with a plurality of slots for accommodating reagent cups. Specifically, the sample tray 2 includes an upper orifice plate 21 and a lower orifice plate 22. The upper orifice plate 21 is provided with a plurality of upper through holes, and the lower orifice plate 22 is provided with a plurality of lower through holes, wherein the outer diameter of the reagent cup is smaller than the diameter of the upper through hole and larger than the diameter of the lower through hole. The lower orifice plate 22 is fixed to the upper orifice plate 21 by a plurality of pillars, and the hole positions on the upper orifice plate 21 and the lower orifice plate 22 are arranged one by one to jointly form slots for accommodating reagent cups. As shown in the figure, the plurality of slots are arranged in layers and evenly in the circumferential direction.

[0030] In addition, a baffle 4 is provided in the chamber accommodating the sample tray 2. The baffle 4 is arranged horizontally and fixed to the inner wall of the chamber. The baffle 4 is arranged around the lower hole plate 22 to prevent the reagent cup from falling to the bottom of the chamber in the event of a failure.

[0031] The first driving unit comprises a toothed disc, a gear and a first stepper motor. The first stepper motor is fixed in the shell body 1 and can transmit the rotational motion to the gear. The gear is engaged with the toothed disc. The toothed disc is arranged below the baffle 4 and is coaxially fixed upward with the lower hole plate 22, so that the rotational motion can be transmitted to the sample plate 2.

[0032] In this embodiment, a baffle is provided on the lower orifice plate 22 , and an optical coupler is fixed in the chamber where the sample tray 2 is located. The optical coupler can identify the baffle and send a signal to the controller, so that the rotation of the sample tray 2 can be monitored.

[0033] The sampling needle 3 can be moved under the action of the second driving unit 5 to extract the reagent in the reagent cup at the set position. The second driving unit 5 includes a column 51, a first slide 52, a second motor, a cross bar 53, a second slide 54 and a third motor, wherein the column 51 is fixed in the shell body 1, the first slide 52 is slidably connected to the column 51 up and down and can slide up and down under the action of the second motor, the cross bar 53 is fixed to the first slide 52, the second slide 54 is slidably connected to the cross bar 53 axially and can slide axially under the action of the third motor, the sampling needle 3 is fixed on the second slide 54, and a long hole for avoiding the sampling needle 3 is provided on the horizontal plate facing the end of the sampling needle 3, and the long hole extends radially along the sample disk 2.

[0034] like Figure 3 As shown, the distal end of the sampling needle 3 includes a spike portion, and the conical surface forming the spike portion is provided with at least one liquid passage 31 for passage of sample or cleaning fluid. In this embodiment, a single liquid passage 31 is provided and extends radially. In other embodiments of the present invention, two or more liquid passages 31 may be provided, with the multiple liquid passages 31 evenly spaced around the circumference.

[0035] Also includes a needle washing tank 6 and a cleaning bottle 7, such as Figure 4 As shown, the needle washing tank 6 includes a vertically extending needle washing chamber, the bottom of the needle washing chamber is connected to the bottom of the cleaning bottle 7 through a connecting tube (not shown), and a valve is provided on the connecting tube. Under normal working conditions, the valve connects the cleaning tank 6 and the cleaning bottle 7, so that the liquid level heights in the cleaning tank 6 and the cleaning bottle 7 are consistent. When the cleaning liquid in the needle washing tank 6 needs to be replaced, the valve disconnects the needle washing tank 6 and the cleaning bottle 7, and the waste liquid in the needle washing tank 6 can be discharged outward through the valve.

[0036] During operation, when the sampling needle 3 is inserted into the needle washing cavity, the cleaning liquid in the needle washing cavity can surround the inner and outer wall surfaces of the sampling needle 3, so that the inside and outside of the sampling needle 3 can be cleaned.

[0037] In this embodiment, the needle washing trough 6 and the sample tray 2 are arranged in the same chamber, and the needle washing trough 6 and the cleaning bottle 7 are arranged in different chambers, which can better utilize the space in the shell body 1. In addition, the side wall of the chamber for accommodating the cleaning bottle 7 is provided with an opening, and the opening is hinged with a door panel 13. The door panel 13 can be opened to replenish the cleaning liquid to the cleaning bottle 7.

[0038] like Figure 2 As shown, it also includes a liquid leakage alarm device 9 and a liquid receiving box 10. The liquid leakage alarm device 9 is a prior art and can be selected by those skilled in the art according to their needs. In addition, the second driving unit 5 also includes a peristaltic pump, which can be connected to the sampling needle 3 through a selection valve to complete the sampling operation. The liquid receiving box 10 is arranged below the inlet and outlet of the peristaltic pump and the selection valve to receive leaked liquid. The probe of the liquid leakage alarm device 9 is close to the inner bottom surface of the liquid receiving box 10 and can send a signal to the controller.

[0039] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments. Any changes or modifications based on the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A disc-type sample injector, comprising a shell body (1), wherein a sample disc (2), a sampling needle (3), a first drive unit and a second drive unit (5) are provided in the shell body (1), wherein the sample disc (2) is provided with a plurality of slots for accommodating reagent cups and can be rotated under the action of the first drive unit, and the sampling needle (3) can be moved under the action of the second drive unit (5) to extract the reagent in the reagent cup at a set position, characterized in that: The end of the sampling needle (3) includes a spike portion, and at least one liquid hole (31) is provided on the conical surface forming the spike portion for allowing the sample or cleaning liquid to flow through.

2. The disc-type sample injector according to claim 1, characterized in that: There are multiple liquid holes (31) and they are evenly arranged in the circumferential direction.

3. The disc sampler according to claim 1, characterized in that It also includes a needle washing tank (6) and a cleaning bottle (7), wherein the needle washing tank (6) includes a vertically extending needle washing chamber, the bottom of the needle washing chamber is connected to the bottom of the cleaning bottle (7) through a connecting pipe, and a valve is provided on the connecting pipe. When the sampling needle (3) is inserted into the needle washing chamber, the cleaning liquid in the needle washing chamber can surround the sampling needle (3) to clean the inside and outside of the sampling needle (3).

4. The disc-type sample injector according to claim 3, characterized in that: The shell body (1) includes a partition (8), and the partition (8) includes a vertical plate and a horizontal plate to divide the inner cavity of the shell body (1) into a plurality of relatively independent chambers, so that the chamber where the sample disk (2) is located is relatively separated from the chamber where the sampling needle (3) and the second drive unit (5) are located, and the horizontal plate is provided with a long hole for avoiding the sampling needle (3).

5. The disc-type sample injector according to claim 4, characterized in that: The long hole extends along the radial direction of the sample disk (2).

6. The disc-type sample injector according to claim 4, characterized in that: The needle washing tank (6) and the sample tray (2) are arranged in the same chamber, and the needle washing tank (6) and the cleaning bottle (7) are arranged in different chambers.

7. The disc-type sample injector according to any one of claims 4 to 6, characterized in that: The chamber for accommodating the sample tray (2) is provided with an upper opening, and a flip cover (11) is hinged at the opening to facilitate taking and placing the reagent cup.

8. The disc-type sample injector according to claim 7, characterized in that: The side wall of the chamber accommodating the sample tray (2) includes a curved transparent plate (12) to facilitate viewing of the sampling situation.

9. The disc-type sample injector according to claim 7, characterized in that: The sample tray (2) comprises an upper orifice plate (21) and a lower orifice plate (22), wherein the lower orifice plate (22) is fixedly connected to the upper orifice plate (21) via a plurality of pillars, and the hole positions on the upper orifice plate (21) and the lower orifice plate (22) are arranged in a one-to-one correspondence to form a slot for accommodating a reagent cup, and a baffle is provided on the upper orifice plate (21) or the lower orifice plate (22), and an optical coupler is fixedly provided in the chamber where the sample tray (2) is located, and the optical coupler can identify the baffle and send a signal to a controller.

10. The disc-type sample injector according to claim 8 or 9, characterized in that: It also includes a liquid leakage alarm device (9) and a liquid receiving box (10), the second driving unit (5) includes a peristaltic pump, the peristaltic pump can be connected to the sampling needle (3) through a selection valve, the liquid receiving box (10) is arranged below the inlet and outlet of the peristaltic pump and the selection valve to receive leaked liquid, and the probe of the liquid leakage alarm device (9) is close to the inner bottom surface of the liquid receiving box (10) and can send a signal to the controller.

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