A sample concentration device with adjustable needle position

Abstract

The utility model relates to nitrogen blowing instrument equipment technical field and disclose a kind of sample concentration device of adjustable needle position, including machine body and test tube tray;When control fixed frame makes needle tube move downward, the part of test tube tray with test tube body will push support ring to make needle tube move upward and realize air hole reaches in gas guide groove, nitrogen passes outer tube and enters gas guide groove, air hole, needle tube and test tube body in sequence, while the part of test tube tray without test tube body will not push support ring, nitrogen cannot enter needle tube and discharge, to further realize the accurate discharge of nitrogen, benefit from the connecting relationship of fixed frame and guide base and the shape of guide base, fixed frame moves on guide base and turns, and can be positioned in the front and back two sides of limiting rod under the action of positioning needle, when fixed frame is positioned in the front side of limiting rod, nitrogen blowing operation can be carried out, when fixed frame is positioned in the rear side of limiting rod, the space below needle tube increases, flushing or disassembly replacement of needle tube can be realized.

Description

Technical Field

[0001] This utility model relates to the technical field of nitrogen blowing equipment, specifically a sample concentration device with adjustable needle position. Background Technology

[0002] A nitrogen evaporator is a commonly used laboratory device, primarily used to accelerate the evaporation of solvents in samples by purging high-purity nitrogen gas, thereby achieving rapid sample concentration or purification. Its core principle is to use nitrogen gas to purge the heated sample surface, disrupting the solvent's gas-liquid equilibrium. Combined with temperature control, this promotes solvent evaporation, thus efficiently concentrating the target component. A needle is required to deliver the nitrogen gas.

[0003] Chinese patent CN217605446U discloses a nitrogen evaporator with adjustable needle position, comprising: a sample tray and a nitrogen evaporator body, the nitrogen evaporator body being mounted above the sample tray; and a needle mechanism including a connecting needle support, a connecting hose, and a connecting needle tip, the connecting needle support being connected to the output end of the nitrogen evaporator body. The adjustable needle position nitrogen evaporator provided by this invention features a connecting hose movably mounted on the connecting needle support via a sealing ring, facilitating adaptive adjustment of the needle position and making sample bottle placement more flexible. Furthermore, by adjusting the length of the connecting hose portion of the transmission line, the sample bottle placement is not limited to the sample tray. The detachable connecting hose and connecting needle tip portions can be disassembled and cleaned separately, effectively avoiding cross-contamination between different samples.

[0004] The above-mentioned device has the function of detachable needle tip, but the sample tray may not be filled with test tubes when using the existing device. Therefore, the needle needs to be selectively connected according to the position of the test tubes, which results in low nitrogen blowing efficiency. The sample tray can only move up and down above the nitrogen blowing instrument body, which limits the space under the sample tray and makes it difficult to install and remove the needle. Therefore, a sample concentration device with adjustable needle position is needed. Utility Model Content

[0005] The purpose of this invention is to provide a sample concentration device with adjustable needle position to solve the problems of low efficiency in matching needles with test tubes and difficulty in attaching and detaching needles in existing devices.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sample concentration device with adjustable needle position, comprising a body and a test tube tray, wherein a plurality of test tubes are movably mounted on the test tube tray, and a gas delivery mechanism is provided on the upper side of the plurality of test tubes; the gas delivery mechanism includes a fixed frame, wherein a plurality of outer tubes are fixedly mounted on the fixed frame, and a gas guide groove is opened inside the outer tubes, a needle tube is slidably mounted on the gas guide groove, and air holes are opened on both sides of the needle tube, and a support spring is fixedly installed between the needle tube and the outer tubes, and a support ring is fixedly installed on the outside of the needle tube.

[0007] Preferably, the positions of the test tubes correspond to those of the outer tubes, and the outer tubes are glued together by a small-diameter cap-shaped tube and a large-diameter cylindrical tube.

[0008] Preferably, a gap is left between the inner wall of the air guide groove and the needle tube, and the needle tube is tightly attached to the outer tube.

[0009] Preferably, the upper end of the needle is closed, and the outer diameter of the support ring is larger than the outer diameter of the test tube body opening and smaller than the inner diameter of the circular hole on the test tube tray.

[0010] Preferably, a support mechanism is provided between the machine body and the fixed frame. The support mechanism includes a limiting rod, which is fixedly installed on the machine body. An electric telescopic rod is fixedly installed on one side of the limiting rod. A guide seat is fixedly installed on the output end of the electric telescopic rod. Two rollers are fixedly installed on the guide seat. Two positioning grooves are opened on both sides of the guide seat. A positioning pin is embedded and installed through the two positioning grooves and the fixed frame.

[0011] Preferably, the limiting rod is clamped between two rollers, and one side of the guide seat is composed of two U-shaped rings.

[0012] Preferably, the fixing bracket is slidably mounted on the guide seat, and a small hole is provided on one side of the fixing bracket.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1) In this sample concentration device with adjustable needle position, when the control frame moves the needle downward, the part of the test tube tray containing the test tube body will push the support ring to move the needle upward and allow the gas hole to reach the gas guide groove. At this time, nitrogen gas enters the gas guide groove, gas hole, needle tube and test tube body in sequence through the outer tube. The part of the test tube tray without the test tube body will not be able to push the support ring, so that nitrogen gas cannot enter the needle tube and be discharged, thereby achieving precise nitrogen gas discharge. 2) This sample concentration device with adjustable needle position benefits from the connection between the fixed frame and the guide seat and the shape of the guide seat, allowing the fixed frame to move and turn on the guide seat, and to be positioned on the front and rear sides of the limiting rod under the action of the positioning needle. When the fixed frame is positioned on the front side of the limiting rod, nitrogen blowing can be performed. When the fixed frame is positioned on the rear side of the limiting rod, the space below the needle tube increases, which can realize the flushing or disassembly and replacement of the needle tube. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a sample concentration device with an adjustable needle position according to an embodiment of the present invention.

[0015] Figure 2 This is a three-dimensional structural diagram of the gas delivery mechanism in an embodiment of this utility model.

[0016] Figure 3 This is a cross-sectional view of the outer tube and needle in an embodiment of this utility model.

[0017] Figure 4 This is a cross-sectional view of the gas delivery mechanism in an embodiment of this utility model.

[0018] Figure 5 This is a three-dimensional structural exploded view of the support mechanism in an embodiment of this utility model.

[0019] In the diagram: 1. Main body; 2. Test tube tray; 3. Test tube body; 4. Gas delivery mechanism; 401. Fixing frame; 402. Outer tube; 403. Gas guide groove; 404. Needle tube; 405. Gas hole; 406. Support spring; 407. Support ring; 5. Support mechanism; 501. Limiting rod; 502. Electric telescopic rod; 503. Guide seat; 504. Roller; 505. Positioning groove; 506. Positioning pin. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0021] Combination Figures 1-4A sample concentration device with adjustable needle position includes a body 1 and a test tube tray 2. Several test tubes 3 are movably mounted on the test tube tray 2, and a gas delivery mechanism 4 is provided on the upper side of the test tubes 3. The gas delivery mechanism 4 includes a fixed frame 401, several outer tubes 402 are fixedly mounted on the fixed frame 401, a gas guide groove 403 is opened inside the outer tubes 402, a needle tube 404 is slidably mounted on the gas guide groove 403, air holes 405 are opened on both sides of the needle tube 404, a support spring 406 is fixedly installed between the needle tube 404 and the outer tubes 402, and a support ring 407 is fixedly installed on the outside of the needle tube 404.

[0022] Several test tubes 3 correspond to several outer tubes 402. The outer tube 402 is formed by bonding a small-diameter cap-shaped tube and a large-diameter cylindrical tube. A gap is left between the inner wall of the gas guide groove 403 and the syringe 404 for nitrogen flow. The syringe 404 is tightly fitted to the outer tube 402 to prevent nitrogen leakage between them. The upper end of the syringe 404 is sealed, allowing nitrogen to enter only through two gas holes 405. During use, the outer diameter of the support ring 407 is larger than that of the test tube 3. The outer diameter of the tube opening is smaller than the inner diameter of the circular hole on the test tube tray 2. When the control fixture 401 moves the needle tube 404 downward, the part of the test tube tray 2 containing the test tube body 3 will push the support ring 407 to move the needle tube 404 upward and allow the gas hole 405 to reach the gas guide groove 403. At this time, nitrogen gas enters the gas guide groove 403, gas hole 405, needle tube 404 and test tube body 3 in sequence through the outer tube 402. The part of the test tube tray 2 without the test tube body 3 will not be able to push the support ring 407, so that nitrogen gas cannot enter the needle tube 404 and be discharged. Example 2

[0023] See Figure 5 A support mechanism 5 is provided between the machine body 1 and the fixed frame 401. The support mechanism 5 includes a limiting rod 501, which is fixedly installed on the machine body 1. An electric telescopic rod 502 is fixedly installed on one side of the limiting rod 501. A guide seat 503 is fixedly installed on the output end of the electric telescopic rod 502. Two rollers 504 are fixedly installed on the guide seat 503. Two positioning grooves 505 are opened on both sides of the guide seat 503. A positioning pin 506 is embedded and installed through the two positioning grooves 505 and the fixed frame 401.

[0024] The limiting rod 501 is clamped between two rollers 504. The rollers 504 are used to reduce the friction on the limiting rod 501 and ensure that the guide seat 503 is supported by the electric telescopic rod 502 and moves up and down along the limiting rod 501. One side of the guide seat 503 is composed of two U-shaped rings. The fixing frame 401 is snapped and slidably installed on the guide seat 503. A small hole is opened on one side of the fixing frame 401 so that the fixing frame 401 can move and turn on the guide seat 503. Under the action of the positioning pin 506, it is positioned on the front and rear sides of the limiting rod 501. When the fixing frame 401 is positioned on the front side of the limiting rod 501, nitrogen blowing can be performed. When the fixing frame 401 is positioned on the rear side of the limiting rod 501, the space below the needle tube 404 increases, which can realize the rinsing or disassembly and replacement of the needle tube 404.

[0025] In actual operation, thanks to the fact that the outer diameter of the support ring 407 is larger than the outer diameter of the tube opening of the test tube body 3 and smaller than the inner diameter of the round hole on the test tube tray 2, when the control fixture 401 moves the needle tube 404 downward, the part of the test tube tray 2 containing the test tube body 3 will push the support ring 407 to move the needle tube 404 upward and realize that the gas hole 405 reaches the gas guide groove 403. At this time, nitrogen gas enters the gas guide groove 403, gas hole 405, needle tube 404 and test tube body 3 in sequence through the outer tube 402. The part of the test tube tray 2 without the test tube body 3 will not be able to push the support ring 407, so that nitrogen gas cannot enter the needle tube 404 and be discharged, thereby realizing the precise discharge of nitrogen gas. Benefiting from the connection between the fixing frame 401 and the guide seat 503 and the shape of the guide seat 503, the fixing frame 401 can move and turn on the guide seat 503, and can be positioned on the front and rear sides of the limiting rod 501 under the action of the positioning pin 506. When the fixing frame 401 is positioned on the front side of the limiting rod 501, nitrogen blowing can be performed. When the fixing frame 401 is positioned on the rear side of the limiting rod 501, the space below the needle tube 404 increases, which can realize the rinsing or disassembly and replacement of the needle tube 404.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sample concentration device with adjustable needle position, comprising a body (1) and a test tube tray (2), wherein a plurality of test tubes (3) are movably mounted on the test tube tray (2), characterized in that: A gas delivery mechanism (4) is provided on the upper side of several of the test tubes (3); The gas delivery mechanism (4) includes a fixed frame (401), on which a plurality of outer tubes (402) are fixedly installed. An air guide groove (403) is opened inside the outer tube (402). A needle tube (404) is slidably installed on the air guide groove (403). Air holes (405) are opened on both sides of the needle tube (404). A support spring (406) is fixedly installed between the needle tube (404) and the outer tube (402). A support ring (407) is fixedly installed on the outside of the needle tube (404).

2. The sample concentration device with adjustable needle position according to claim 1, characterized in that: The positions of several test tubes (3) correspond to those of several outer tubes (402), and the outer tubes (402) are glued together by a small-diameter cap-shaped tube and a large-diameter cylindrical tube.

3. The sample concentration device with adjustable needle position according to claim 2, characterized in that: A gap is left between the inner wall of the air guide groove (403) and the needle tube (404), and the needle tube (404) is tightly attached to the outer tube (402).

4. The sample concentration device with adjustable needle position according to claim 3, characterized in that: The upper end of the needle tube (404) is closed, and the outer diameter of the support ring (407) is greater than the outer diameter of the tube opening of the test tube body (3) and smaller than the inner diameter of the round hole on the test tube tray (2).

5. The sample concentration device with adjustable needle position according to claim 1, characterized in that: A support mechanism (5) is provided between the body (1) and the fixed frame (401). The support mechanism (5) includes a limiting rod (501). The limiting rod (501) is fixedly installed on the body (1), and an electric telescopic rod (502) is fixedly installed on one side of the limiting rod (501). A guide seat (503) is fixedly installed on the output end of the electric telescopic rod (502). Two rollers (504) are fixedly installed on the guide seat (503), and two positioning grooves (505) are opened on both sides of the guide seat (503). A positioning pin (506) is embedded and installed through the two positioning grooves (505) and the fixed frame (401).

6. The sample concentration device with adjustable needle position according to claim 5, characterized in that: The limiting rod (501) is clamped between two rollers (504), and one side of the guide seat (503) is composed of two U-shaped rings.

7. A sample concentration device with adjustable needle position according to claim 6, characterized in that: The fixing frame (401) is slidably mounted on the guide seat (503) and a small hole is provided on one side of the fixing frame (401).

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