A dry nitrogen blowing instrument facilitating liquid level control

Abstract

The utility model discloses a kind of dry nitrogen blower convenient to liquid level control, it is related to nitrogen blower technical field, including the dry nitrogen blower body being equipped with test tube groove, mounting table and the driving device for driving mounting table lifting;Blow needle is connected with mounting table by blow needle mounting structure, and the positioning sleeve of blow needle mounting structure is inserted into the mounting hole opened on mounting table, and its top forms limiting table;Blow needle is passed through in positioning sleeve, and is clamped and limited by the clamping structure of positioning sleeve mounting connection.This utility model's blow needle is detachably mounted on mounting table by the way of clamping and limiting by blow needle mounting structure, each blow needle can be conveniently individually mounted and dismounted, greatly improve the replacement efficiency of blow needle, it is convenient to replace different specifications of blow needle according to needs in test process, improve the flexibility and adaptability of dry nitrogen blower work, simultaneously provide conditions for the individual maintenance of blow needle, avoid long time shutdown caused by blow needle overall maintenance, conducive to the reduction of equipment maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen blowing instruments, specifically to a dry nitrogen blowing instrument for sample concentration. Background Technology

[0002] A dry nitrogen evaporator is a laboratory device used for sample pretreatment, primarily in pharmaceuticals, medical testing, and pesticide residue detection. It works by blowing nitrogen gas onto the surface of a heated sample, causing the solvent in the sample to evaporate and separate rapidly, thus achieving oxygen-free concentration of the sample.

[0003] Traditional dry nitrogen blowing apparatus includes a base, a heating device fixedly installed on the base, and test tube clamps. During sample processing, the test tubes containing the sample are held and fixed by the test tube clamps and heated and concentrated by the heating device.

[0004] Based on existing technology searches, the following known technical solutions exist: Prior Art 1: A Dry Nitrogen Blower for Easy Batch Operation Application number: CN202321485194.X, application date: June 12, 2023, publication (announcement) date: December 19, 2023.

[0005] Prior art 1 discloses a dry nitrogen blowing device that facilitates batch operation, including a base structure. The base structure includes a base, and an operation panel is installed on one inclined surface of the base. A placement groove is opened at the top of the base, and a container structure is installed in the placement groove. The container structure includes a tube container, and the placement groove has a placement circular groove that matches the tube container. The top of the tube container has an integrated tube cap, which facilitates clamping and fixing of the tube container. This utility model, through the provided container structure and clamping structure, can easily clamp and fix up to 50 containers, improving the convenience of container placement and retrieval. At the same time, the provided needle structure, through the installation structure and pressurization structure, can perform overall single-inlet multi-needle blowing at the same pressure, reducing the number of air pressure control devices required, and ensuring that the blowing pressure of each needle is basically the same.

[0006] However, in the prior art 1, the air blowing pipes are fixedly installed on the mounting rack and are not removable. If a certain air blowing pipe has problems such as leakage, damage or blockage, the entire air blowing pipe can only be repaired or replaced, which is not conducive to the control of equipment maintenance costs. At the same time, there is also the problem of long maintenance downtime caused by the long time required for overall repair or replacement.

[0007] Furthermore, when using traditional dry nitrogen blowing apparatus or existing technology 1 for sample concentration, the concentration status needs to be determined by staff removing the test tube from the dry nitrogen blowing apparatus for observation. This operation is cumbersome, inconvenient, and prone to significant errors in visual observation, affecting the accuracy of sample concentration and compromising the accuracy of subsequent experiments. During the concentration of some samples, staff must repeatedly remove the test tube to observe the concentration status, further impacting the concentration efficiency. Utility Model Content

[0008] This invention aims to overcome the shortcomings of the existing technology by providing a dry nitrogen blowing device that facilitates liquid level control.

[0009] The present invention adopts the following technical solution to solve the technical problem: a dry nitrogen blowing device that facilitates liquid level control, wherein the fixed end of the driving device is fixedly installed, and the output end is fixedly installed on the mounting platform. The driving device outputs a movement that drives the mounting platform to rise or fall. The top of the dry nitrogen blowing device body has test tube slots arranged in an array for limiting the placement of test tubes. Blowing needles are arranged one-to-one above the test tube slots and are installed and connected to the mounting platform. A blowing needle mounting structure is provided that corresponds one-to-one with the blowing needles. The blow needle mounting structure includes a positioning sleeve and a clamping structure; the positioning sleeve is a cylindrical sleeve structure, which is inserted into the mounting hole opened on the mounting platform, and the top of the positioning sleeve bulges outward to form a limiting platform pressed against the top of the mounting platform. The blow needle passes through the positioning sleeve and is clamped and limited by the clamping structure that is installed and connected to the positioning sleeve.

[0010] Furthermore, the upper part of the positioning sleeve is provided with an internal thread; The clamping structure includes a clamping plate structure and a clamping sleeve; The bottom of the clamping structure is a positioning plate that is fixed to the bottom of the positioning sleeve. A clearance hole is provided in the middle of the positioning plate. At least two elastic clamping pieces are arranged around the top. The top of each clamping piece forms a frustum-shaped structure with a decreasing diameter from bottom to top. A gap is left between adjacent clamping pieces, and a clearance hole is formed between each clamping piece at the center of the frustum-shaped structure. The clamping sleeve has a cylindrical sleeve structure from the middle to the top, and an external thread is provided at the bottom; a tapered hole with a decreasing diameter from bottom to top is opened in the bottom of the clamping sleeve. The positioning sleeve and the clamping sleeve are installed through the internal thread and the external thread, so that the tapered hole acts on the frustum-shaped structure, causing each of the clamping pieces to press and clamp the blow needle passing through the relief hole.

[0011] Furthermore, inner ear plates are evenly distributed around the lower part of the positioning sleeve, and mounting grooves are correspondingly opened on the outer periphery of the positioning plate. The inner ear plates and the mounting grooves are matched and engaged one-to-one to install and fix the positioning plate and the positioning sleeve.

[0012] Furthermore, it also includes a PLC controller, a display screen connected to the PLC controller, and an ultrasonic liquid level sensor; A pair of ultrasonic liquid level sensors are symmetrically arranged at the bottom of the positioning plate, and the display screen is mounted on the dry nitrogen blowing device body.

[0013] Furthermore, the inner ear plate is press-fitted into the mounting groove.

[0014] Furthermore, an adhesive pad is adhered to the position where the clip contacts the blow needle.

[0015] Furthermore, the positioning sleeve is interference-fitted into the mounting hole.

[0016] Furthermore, the driving device is a CNC linear screw module, and the slider of the CNC linear screw module serves as the output end of the driving device, and is fixedly installed on the mounting platform.

[0017] This invention provides a dry nitrogen blowing device that facilitates liquid level control, and has the following beneficial effects: 1. The blowing needle of this utility model can be detachably installed on the mounting table by means of clamping and limiting through the blowing needle installation structure. Each blowing needle can be easily installed and removed individually, which greatly improves the replacement efficiency of the blowing needle. It is convenient to replace the blowing needle of different specifications as needed during the test, which improves the flexibility and adaptability of the dry nitrogen blowing instrument. At the same time, it provides conditions for the individual maintenance of the blowing needle, avoids long-term downtime caused by the overall maintenance of the blowing needle, and helps to reduce the equipment maintenance cost.

[0018] 2. The ultrasonic liquid level sensor of this invention can monitor the liquid level information in the test tube in real time, which makes it easy for staff to directly determine the concentration of the sample, thus improving experimental efficiency and convenience. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded structural diagram of the blow needle mounting structure of this utility model from a first-view perspective. Figure 3 This is a second-view exploded structural diagram of the blow needle mounting structure of this utility model.

[0020] Numbering on the map: 1. Dry nitrogen blowing device body; 11. Test tube tank; 2. Mounting platform; 3. Blowing needle; 4. Drive device; 5. Blowing needle mounting structure; 51. Positioning sleeve; 511. Limiting platform; 512. Internal thread; 513. Inner ear plate; 52. Clamping plate structure; 521. Positioning plate; 522. Clamping plate; 53. Clamping sleeve; 531. External thread; 532. Conical hole; 6. Ultrasonic liquid level sensor. Detailed Implementation

[0021] 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 in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] like Figures 1-3 As shown, its structural relationship is as follows: a dry nitrogen blowing device that facilitates liquid level control, the fixed end of the drive device 4 is fixedly installed, the output end is fixedly installed with the mounting platform 2, and the drive device 4 outputs to drive the mounting platform 2 to move up or down; the top of the dry nitrogen blowing device body 1 is arranged in an array to limit the placement of test tubes in test tube slots 11, and the blowing needles 3 are arranged one-to-one above the test tube slots 11 and connected to the mounting platform 2, and a blowing needle mounting structure 5 is provided that corresponds one-to-one with the blowing needles 3; The blow needle mounting structure 5 includes a positioning sleeve 51 and a clamping structure; the positioning sleeve 51 is a cylindrical sleeve structure, which is inserted into the mounting hole opened on the mounting platform 2, and the top of the positioning sleeve 51 protrudes radially outward to form a limiting platform 511 pressed on the top of the mounting platform 2. The blow needle 3 passes through the positioning sleeve 51 and is clamped and limited by the clamping structure that is installed and connected to the positioning sleeve 51.

[0023] Preferably, the upper part of the positioning sleeve 51 has an internal thread 512; The clamping structure includes a clamping plate structure 52 and a clamping sleeve 53; The bottom of the clamping structure 52 is a positioning plate 521 that is fixed to the bottom of the positioning sleeve 51. A clearance hole is provided in the middle of the positioning plate 521. At least two elastic clamping pieces 522 are arranged around the top. The top of each clamping piece 522 forms a frustum-shaped structure with a decreasing diameter from bottom to top. A gap is left between adjacent clamping pieces 522, and a clearance hole is formed between each clamping piece 522 at the center of the frustum-shaped structure. The clamping sleeve 53 has a cylindrical sleeve structure from the middle to the top, and an external thread 531 is provided at the bottom; a tapered hole 532 with a decreasing diameter from bottom to top is opened in the bottom of the clamping sleeve 53. The positioning sleeve 51 and the clamping sleeve 53 are installed by the internal thread 512 and the external thread 531, so that the tapered hole 532 acts on the frustum-shaped structure, causing each clamping piece 522 to press and clamp the blow needle 3 that passes through the relief hole.

[0024] The taper angle between the frustum-shaped structure and the conical hole 532 is preferably 10°~30°, so as to balance clamping efficiency and ensure that the force of the conical hole 532 acting on the frustum-shaped structure can reliably clamp the blow needle 3 with a sufficiently large frictional force. The external thread 531 and the internal thread 512 are preferably trapezoidal or cylindrical threads to ensure good thread engagement and force transmission efficiency.

[0025] Preferably, inner ear plates 513 are evenly distributed around the lower part of the positioning sleeve 51, and mounting grooves are correspondingly opened on the outer periphery of the positioning plate 521. The inner ear plates 513 and the mounting grooves are matched and engaged one by one to install and fix the positioning plate 521 and the positioning sleeve 51.

[0026] In actual setup, the number of inner ear plates 513 and mounting slots is preferably four.

[0027] Preferably, it also includes a PLC controller, a display screen connected to the PLC controller, and an ultrasonic liquid level sensor 6; A pair of ultrasonic liquid level sensors 6 are symmetrically arranged at the bottom of the positioning plate 521, and the display screen is installed on the dry nitrogen blowing device body 1.

[0028] The ultrasonic level sensor 6 obtains the liquid level information of the solution by emitting ultrasonic signals into the solution in the test tube and calculating the time difference of the echo signals. The pairing of six ultrasonic level sensors can increase the level monitoring range and help reduce the error that may occur when a single ultrasonic level sensor is used.

[0029] Preferably, the inner ear plate 513 is press-fitted into the mounting groove.

[0030] Preferably, a rubber pad is adhered to the contact position between the clamping plate 522 and the blow needle 3 to increase the friction between the two when the clamping plate 522 clamps the blow needle 3, improve the reliability of the clamping plate 522 in holding the blow needle 3, and at the same time avoid damage to the blow needle 3 when the clamping plate 522 clamps the blow needle 3.

[0031] Preferably, the positioning sleeve 51 is inserted into the mounting hole with an interference fit.

[0032] Preferably, the drive device 4 is a CNC linear screw module, and the slider of the CNC linear screw module serves as the output end of the drive device 4, which is fixedly mounted to the mounting platform 2.

[0033] The concentration of samples using the aforementioned dry nitrogen blowdown apparatus, which facilitates liquid level control, includes the following steps: The test tube containing the sample to be concentrated is positioned in the test tube trough 11. The drive device 4 drives the mounting platform 2 to descend, so that the blow needle 3 reaches the working position (the working position of the blow needle 3 is generally that the bottom of the blow needle 3 is 2~5mm away from the sample liquid surface). Then the ultrasonic liquid level sensor 6 starts to work, keeping the liquid level of the sample in the test tube monitored, and the liquid level monitoring information is displayed on the display screen.

[0034] Subsequently, the nitrogen supplied by the dry nitrogen blowing instrument 1 is blown into the test tube through the blowing needle 3 to concentrate the sample in the test tube; during the concentration process, the staff can observe the weighing monitoring information and liquid level monitoring information displayed on the screen as needed until the sample concentration is completed.

[0035] During the concentration process of the sample, the PLC can also make adaptive adjustments to the height of the blow needle 3 and the blowing speed of the nitrogen gas supplied by the dry nitrogen blower body 1 based on the liquid level monitoring information obtained by the ultrasonic liquid level sensor 6. For example, the blow needle 3 can be lowered accordingly as the liquid level of the sample decreases, so as to ensure the uniformity of the evaporation process of the solution in the sample, avoid the liquid from drying out too quickly or insufficient purging, and prevent sample loss or experimental failure.

[0036] In some cases, such as when the specifications of the blow needle 3 do not meet the test requirements or when the blow needle 3 is damaged, the staff will need to replace or maintain the blow needle 3.

[0037] The specific process of disassembling the blow needle 3 is as follows: rotate the clamping sleeve 53 so that the clamping sleeve 53 moves upward under the guidance of the external thread 531 and the internal thread 512. The tapered hole 532 separates from the frustum-shaped structure and no longer acts on the frustum-shaped structure. Then, each clamping piece 522 expands radially outward under its own elastic force and no longer clamps the blow needle 3. Then the blow needle 3 can be removed.

[0038] The specific process of installing the blow needle 3 is as follows: Pass the blow needle 3 through the positioning sleeve 51, the clamping sleeve 53 and the clearance hole, so that the blow needle 3 is at the target installation height; then rotate the clamping sleeve 53, so that the clamping sleeve 53 moves down under the guidance of the external thread 531 and the internal thread 512 until the tapered hole 532 contacts the frustum-shaped structure and acts on the frustum-shaped structure, overcoming the elasticity of each clamping piece 522 and pressing each clamping piece 522 inward, so that each clamping piece 522 clamps the blow needle 3, thus completing the installation of the blow needle 3.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A dry nitrogen blowing device for easy liquid level control, wherein the fixed end of the driving device (4) is fixedly installed, and the output end is fixedly installed on the mounting platform (2), and the driving device (4) outputs a motion to drive the mounting platform (2) to rise or fall; the top of the dry nitrogen blowing device body (1) is arranged in an array of test tube slots (11) for limiting the placement of test tubes, and blowing needles (3) are arranged one-to-one above the test tube slots (11) and connected to the mounting platform (2), characterized in that: A blow needle mounting structure (5) is provided that corresponds one-to-one with the blow needle (3); The blow needle mounting structure (5) includes a positioning sleeve (51) and a clamping structure; the positioning sleeve (51) is a cylindrical sleeve structure, which is inserted into the mounting hole opened on the mounting platform (2), and the top of the positioning sleeve (51) bulges outward to form a limiting platform (511) pressed against the top of the mounting platform (2). The blow needle (3) passes through the positioning sleeve (51) and is clamped and limited by the clamping structure that is installed and connected to the positioning sleeve (51).

2. The dry nitrogen blowing device for easy liquid level control according to claim 1, characterized in that: The upper part of the positioning sleeve (51) has an internal thread (512). The clamping structure includes a clamping plate structure (52) and a clamping sleeve (53); The bottom of the clamping structure (52) is a positioning plate (521) that is fixed to the bottom of the positioning sleeve (51). The positioning plate (521) has a clearance hole in the middle and at least two elastic clamping pieces (522) are arranged around the top. The top of each clamping piece (522) forms a frustum-shaped structure with a decreasing diameter from bottom to top. A gap is left between adjacent clamping pieces (522), and a clearance hole is formed between each clamping piece (522) at the center of the frustum-shaped structure. The clamping sleeve (53) has a cylindrical sleeve structure from the middle to the upper part, and an external thread (531) is provided at the bottom; a tapered hole (532) with a decreasing diameter from bottom to top is opened in the bottom of the clamping sleeve (53). The positioning sleeve (51) and the clamping sleeve (53) are installed by the internal thread (512) and the external thread (531) thread engagement, so that the tapered hole (532) acts on the frustum-shaped structure, causing each of the clamping pieces (522) to press and clamp the blow needle (3) passing through the relief hole.

3. A dry nitrogen blowing device for easy liquid level control according to claim 2, characterized in that: The lower part of the positioning sleeve (51) is provided with inner ear plates (513) evenly distributed around the periphery. The outer periphery of the positioning plate (521) is provided with corresponding mounting grooves. The inner ear plates (513) and the mounting grooves are matched and engaged one by one to install and fix the positioning plate (521) and the positioning sleeve (51).

4. A dry nitrogen blowing device for easy liquid level control according to claim 2, characterized in that: It also includes a PLC controller, a display screen connected to the PLC controller, and an ultrasonic liquid level sensor (6). A pair of ultrasonic liquid level sensors (6) are symmetrically provided at the bottom of the positioning plate (521), and the display screen is installed on the dry nitrogen blowing device body (1).

5. A dry nitrogen blowing device for easy liquid level control according to claim 3, characterized in that: The inner ear plate (513) is press-fitted into the mounting groove.

6. A dry nitrogen blowing device for easy liquid level control according to claim 2 or 3, characterized in that: A rubber pad is adhered to the position where the clip (522) contacts the blow needle (3).

7. A dry nitrogen blowing device for easy liquid level control according to claim 1, characterized in that: The positioning sleeve (51) is inserted into the mounting hole with an interference fit.

8. A dry nitrogen blowing device for easy liquid level control according to claim 1, characterized in that: The driving device (4) is a CNC linear screw module. The slider of the CNC linear screw module serves as the output end of the driving device (4) and is fixedly installed on the mounting platform (2).

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