A portable solid phase microextraction device

Abstract

The utility model discloses a portable solid phase microextraction device, including the box, the opening of box is fixed with the fixed plate, the inboard bottom of fixed plate and box forms the installation cavity, be provided with heating assembly and stirring subassembly in the installation cavity, the round hole for placing sample bottle is seted up on the fixed plate, heating assembly and stirring subassembly are used for the heating and stirring of volatile organic compound in sample bottle, still movably insert the extraction component for taking out the sample bottle after heating on the fixed plate, heating assembly includes the installation portion of fixed plate bottom side, the inboard of installation portion is provided with resistance wire, the round hole is located the center at installation portion upside, be provided with power in the installation cavity, resistance wire and power electric connection, stirring subassembly includes the stirrer of fixed in the installation cavity, the stirrer is located the bottom of round hole and installation portion.

Description

Technical Field

[0001] This utility model relates to the field of solid phase extraction equipment technology, and in particular to a portable solid phase microextraction device. Background Technology

[0002] Solid-phase extraction is a sample pretreatment technique that has been developed in recent years. It is a combination of liquid-solid extraction and column liquid chromatography. It is mainly used for the separation, purification and concentration of samples. Compared with the traditional liquid-liquid extraction method, it can improve the recovery rate of analytes, more effectively separate analytes from interfering components, reduce the sample pretreatment process, and is simple, time-saving and labor-saving.

[0003] Chinese patent document CN202111441527.4 discloses a portable solid-phase microextraction device, belonging to the technical field of solid-phase extraction equipment. It includes a housing and a belt. The top and bottom sides of the housing's inner cavity are movably connected to threaded rods of opposite directions via bearings. The top and bottom surfaces of the threaded rods are respectively threaded with upper and lower threaded sleeves. A connecting plate is fixedly connected to each opposite side of the two upper threaded sleeves. The inner cavity of the connecting plate has a through hole, and an extraction head is placed inside the through hole. Although this extraction device can also fix the extraction needle, it uses components such as a drive shaft, a driving pulley, a driven pulley, and a handle, all located inside the housing. In case of a problem, it may hinder emergency use outdoors.

[0004] Chinese patent document CN202222632923.1 discloses a portable solid-phase extraction device, including a base. The solid-phase extraction device body is fixedly mounted on the top side of the base, and an electrically operated telescopic rod is fixedly mounted on the bottom side of the inner side of the solid-phase extraction device body. A dust cover helps to prevent dust and other impurities from entering the device, contaminating the internal parts, and affecting the extracted material. This extraction device mainly addresses the problem of outdoor dust prevention. Although its mechanical structure ensures stability for outdoor use, it is heavy and requires specialized operation, making it inconvenient for outdoor workers.

[0005] It is evident that most solid-phase extraction devices currently on the market are not only inconvenient to carry when traveling, but also require staff to perform a series of inconvenient operations when conducting extraction outdoors. Furthermore, the mechanical structure of existing equipment is not conducive to performing the delicate operations of solid-phase micro-extraction.

[0006] In solid-phase extraction, the extraction needle is fragile and expensive. Solid-phase microextraction requires the extraction head to be inserted into the sample vial for more than half an hour. If not careful, the extraction needle will break, resulting in losses. This is a problem that urgently needs to be solved in portable solid-phase extraction devices at present. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a portable solid-phase microextraction device for emergency on-site solid-phase microextraction of VOCs in solids and liquids when there is no power supply outside the laboratory.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] A portable solid-phase microextraction device, characterized in that it comprises:

[0010] The box has a fixed plate at its opening, which forms an installation cavity with the bottom inner side of the box. A heating component and a stirring component are installed in the installation cavity. The fixed plate has a circular hole for placing a sample bottle. The heating component and the stirring component are used to heat and stir the volatile organic compounds in the sample bottle. An extraction component for removing the heated sample bottle is also movably inserted into the fixed plate.

[0011] Furthermore, the heating assembly includes a mounting portion fixed to the bottom side of the fixing plate, a resistance wire is provided on the inner side of the mounting portion, the circular hole is located at the center of the upper side of the mounting portion, a power source is provided in the mounting cavity, and the resistance wire is connected to the power source.

[0012] Furthermore, the stirring assembly includes a stirrer fixed in the mounting cavity, the stirrer being located at the bottom of the circular hole and the mounting part; the mounting part has a circular hole on its lower side, and a stir bar driven by the magnetic field emitted by the stirrer is provided inside the sample bottle.

[0013] Furthermore, the extraction assembly includes a fixing column, and the fixing plate is provided with an insertion hole. The fixing column is inserted into the insertion hole and is limited in position. An extraction plate is slidably disposed on the fixing column. The extension end of the extraction plate is provided with a fixing hole. The fixing hole is used to fix the extraction needle. A first fastening head is screwed onto the outside of the extraction plate. The inner end of the first fastening head is used to abut against the outer wall of the extraction needle.

[0014] Furthermore, a second fastening head is screwed onto the outer side of the other end of the extraction plate. The second fastening head is positioned opposite to the first fastening head, and the inner end of the second fastening head abuts against the fixing post.

[0015] Furthermore, a lid is hinged to the box body, and the lid is fastened to the box body by a snap fastener; the lid has a handle.

[0016] Furthermore, a power switch and a heating switch are embedded in the fixing plate; a stirring control panel, a time control panel, and a temperature control panel are also embedded in the fixing plate.

[0017] The beneficial effects of this utility model are:

[0018] This utility model proposes a portable solid-phase microextraction device. By fitting a fixing hole onto the extraction needle and then screwing on a first fastening head to fix the extraction needle, and then sliding the extraction needle to a certain height and fixing it with a second fastening head, the extraction needle is inserted into the sample vial. Extraction is then performed by maintaining the needle in a stable state. This eliminates the need for prolonged manual handling, keeps the extraction needle stable, frees the user's hands, reduces workload, and minimizes the risk of breaking the extraction needle due to improper operation. Attached Figure Description

[0019] Figure 1 This is a front view of the present invention;

[0020] Figure 2 This is a cross-sectional view of the present invention;

[0021] Figure 3 This is a top view after the box lid is opened;

[0022] Figure 4 This is a schematic diagram of the extraction component. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0024] Example 1

[0025] In this embodiment, as Figures 1 to 4 As shown, a portable solid-phase microextraction device includes a housing 1. A fixing plate 2 is fixed to the opening of the housing 1. After fixing, the fixing plate 2 forms an installation cavity with the inner bottom of the housing 1. A heating component and a stirring component are arranged in the installation cavity for heating and stirring the volatile organic compounds in the sample vial 3. A circular hole is provided on the fixing plate 2 for placing the sample vial 3. An extraction component is also movably inserted into the fixing plate 2 for removing the heated sample vial 3.

[0026] Specifically, in this embodiment, cylinders are fixed at the four corners of the box 1, and screw holes are opened at the upper end of the cylinders. The fixing plate 2 is fixed to the cylinders by bolts.

[0027] Specifically, the fixing plate 2 is made of heat-insulating material. A base is also fixed to the lower side of the fixing plate 2. The base is located below the circular hole and limits the position of the sample bottle 3.

[0028] Example 2

[0029] In this embodiment, the heating assembly includes a mounting part fixed to the bottom side of the fixing plate 2. Specifically, a resistance wire 5 is provided on the inner side of the mounting part. The circular hole is located at the center of the upper side of the mounting part. A power supply 6 is provided in the mounting cavity formed by the fixing plate 2 and the housing 1. The resistance wire 5 is electrically connected to the power supply 6.

[0030] Specifically, a 24V lithium battery is used as the power source, which heats the sample in the sample vial 3 by heating the resistance wire 5.

[0031] like Figure 2 As shown, the mounting part is used to fix the resistance wire 5. The mounting part adopts a bowl-shaped structure to concentrate heat, and the mounting part is made of high temperature resistant material.

[0032] Example 3

[0033] In this embodiment, the stirring assembly includes a stirrer 7 fixed in the mounting cavity, the stirrer 7 being located below the circular hole and the mounting part; the mounting part has a circular hole on its lower side, and the sample bottle 3 is provided with a stir bar driven by the magnetic field emitted by the stirrer 7.

[0034] In this embodiment, the stirrer 7 is a magnetic stirrer, which adopts existing technology (magnetic stirrer model: KJ78-1). Its specific structure will not be described in detail here. The stirrer has a cross-shaped structure.

[0035] During use, the retrieved sample is placed in sample bottle 3. The sample bottle 3 is heated, and a magnetic stirrer 7 at the bottom of the sample bottle 3 stirs the sample to accelerate evaporation. The extraction needle is fixed to the upper part of the sample bottle 3 to complete the extraction.

[0036] In one or more specific embodiments of this utility model, such as Figure 3 and Figure 4As shown, the extraction assembly includes a fixing post 9, and a socket 8 is provided on the fixing plate 2. The fixing post 9 is inserted into the socket and is limited in position. An extraction plate 10 is slidably disposed on the fixing post 9. A fixing hole is provided at the extended end of the extraction plate 10. The fixing hole is used to fix the extraction needle. A first fastening head 11 is screwed onto the extraction plate 10. The inner end of the first fastening head 11 is used to abut against the outer wall of the extraction needle.

[0037] In one or more embodiments of this utility model, a second fastening head 12 is screwed onto the outer side of the other end of the extraction plate 10. The second fastening head 12 is positioned opposite to the first fastening head 11, and the inner end of the second fastening head 12 abuts against the fixing post 9.

[0038] Specifically, in practical applications, for the sake of the stability of the mechanism, a protrusion can be provided on the outside of the fixed column 9 as needed. The protrusion is used to limit the position and avoid the instability of locking the position by relying solely on the friction force between the second fastening head 12 and the surface of the fixed column 9.

[0039] Example 4

[0040] In this embodiment, the extraction needle is positioned appropriately by fitting the fixing hole on the extraction plate 10, and then the extraction needle is fixed by screwing on the first fastening head 11. After sliding the extraction needle to a certain height, it is fixed by the second fastening head 12, allowing the extraction needle to be inserted into the sample vial. Extraction is then performed by maintaining this position, eliminating the need for prolonged manual handling and ensuring that the extraction needle does not easily shake during the process. The installation of the fixing post 9 makes removal more convenient and facilitates the closing of the cover 13 to the box body 1 after the fixing post 9 is removed.

[0041] In one or more embodiments of this utility model, a box cover 13 is hinged to the box body 1. The box cover 13 is hinged to the box body 1 on one side, and the opposite side is fastened by a buckle to realize the opening, closing and locking of the box cover 13.

[0042] In this embodiment, the lid 13 has a handle, which makes it easier for the operator to carry the box.

[0043] In one or more embodiments of this utility model, a power switch 14 and a heating switch 15 are embedded in the fixing plate 2. A stirring control panel 16, a time control panel 17, and a temperature control panel 18 are also embedded in the fixing plate 2.

[0044] In practical applications, the power switch is electrically connected to power supply 6, controlling its on / off state. The heating switch 15 is electrically connected to power supply 6 and resistance wire 5, controlling the energization of resistance wire 5. The stirring control panel 16 is electrically connected to power supply 6 and stirrer 7, setting the stirring intensity of stirrer 7. The time control panel 17 is electrically connected to power supply 6, stirrer 7, and resistance wire 5, setting the heating and stirring time, and providing a timer reminder function; timer model: WJ01. The temperature control panel 18 is electrically connected to power supply 6 and resistance wire 5, setting the heating temperature; temperature control panel model: WK7016C. Electrical connections between panels and components, and between panels themselves, are already disclosed in existing and background technologies and will not be elaborated upon here.

[0045] Example 5

[0046] In this embodiment, depending on actual needs, a portable power supply can be built into the housing 1 and electrically connected to the power supply 6, so that the portable power supply can be conveniently replaced to charge the power supply 6 when there is no power.

[0047] Example 6

[0048] In this embodiment, the power supply 6 inside the housing 1 is designed to be detachable, so that it is convenient to directly replace the power supply 6 to provide power when there is no power.

[0049] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connect" should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A portable solid-phase microextraction device, characterized in that, include: The box (1) has a fixed plate (2) fixed at its opening. The fixed plate (2) and the bottom of the inner side of the box (1) form an installation cavity. A heating component and a stirring component are provided in the installation cavity. A round hole for placing a sample bottle (3) is provided on the fixed plate (2). The heating component and the stirring component are used to heat and stir the volatile organic compounds in the sample bottle (3). An extraction component for removing the heated sample bottle (3) is also movably inserted on the fixed plate (2).

2. The portable solid-phase microextraction device according to claim 1, characterized in that: The heating assembly includes a mounting part fixed to the bottom side of the fixing plate (2), a resistance wire (5) is provided on the inner side of the mounting part, the circular hole is located at the center of the upper side of the mounting part, a power supply (6) is provided in the mounting cavity, and the resistance wire (5) is connected to the power supply (6).

3. The portable solid-phase microextraction device according to claim 2, characterized in that: The stirring assembly includes a stirrer (7) fixed in the mounting cavity, the stirrer (7) being located at the bottom of the round hole and the mounting part; the mounting part has a round hole on its lower side, and the sample bottle (3) is provided with a stir bar driven by the magnetic field emitted by the stirrer (7).

4. The portable solid-phase microextraction device according to claim 1, characterized in that: The extraction assembly includes a fixed column (9), and the fixed plate (2) is also provided with an insertion hole (8). The fixed column (9) is inserted into the insertion hole and is limited. An extraction plate (10) is slidably arranged on the fixed column (9). The extension end of the extraction plate (10) is provided with a fixing hole. The fixing hole is used to fix the extraction needle. The extraction plate (10) is externally screwed with a first fastening head (11). The inner end of the first fastening head (11) is used to abut against the outer wall of the extraction needle.

5. A portable solid-phase microextraction device according to claim 4, characterized in that: The other end of the extraction plate (10) is also screwed with a second fastening head (12). The second fastening head (12) is positioned opposite to the first fastening head (11), and the inner end of the second fastening head (12) abuts against the fixing post (9).

6. The portable solid-phase microextraction device according to claim 1, characterized in that: The box body (1) is hinged with a box cover (13), and the box cover (13) and the box body (1) are fastened together by a buckle; the box cover (13) has a handle.

7. A portable solid-phase microextraction device according to claim 2, characterized in that: The fixing plate (2) is equipped with a power switch (14) and a heating switch (15); the fixing plate (2) is also equipped with a stirring control panel (16), a time control panel (17) and a temperature control panel (18).

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