A double-layer assembled liquid nuclear magnetic resonance rotor based on 3D printing

Abstract

The present invention relates to the technical field of nuclear magnetic resonance spectrometers and discloses a double-layer assemblable liquid nuclear magnetic resonance rotor based on 3D printing, comprising: a rotor body which is a hollow tubular structure, wherein a plurality of longitudinal through grooves are evenly arranged in the inner cavity of the rotor body; an inner tube which is a flexible tube, wherein the inner tube is arranged inside the rotor body, and a plurality of connecting strips embedded in the longitudinal through grooves are provided on the outer wall of the inner tube, wherein the longitudinal through grooves and the connecting strips are interference fit; a plurality of annular cavities are distributed on the inner tube along the length direction of the tube body, and a plurality of annular protrusions are provided at the plurality of annular cavities on the inner side wall of the inner tube; the annular cavities are used to provide an escape space for the annular protrusions, and the annular protrusions are used to clamp sample tubes; the double-layer assemblable liquid nuclear magnetic resonance rotor has a good fixing effect on the sample tube, and the fixing parts can be conveniently and quickly replaced and cleaned in the event of aging or contamination, and the rotor has better compatibility with nuclear magnetic tubes of different brands and models.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear magnetic resonance spectrometers, and in particular to a double-layer assemblable liquid nuclear magnetic resonance rotor based on 3D printing. Background Art

[0002] In the field of liquid NMR, the NMR rotor is a key component. It secures the NMR sample tube. When testing a sample in an NMR spectrometer, the sample is loaded into the sample tube and, after passing through the rotor, ensures it falls vertically into the magnet's probe's detection coil while maintaining a certain height. Objectively, the NMR sample tube must not move up and down or left and right within the rotor.

[0003] Existing liquid nuclear magnetic resonance rotors often use O-rings to secure sample tubes. This is achieved by providing multiple circular grooves on the rotor's inner sidewalls, within which O-rings with an inner diameter smaller than the outer diameter of the sample tube are installed. The sample tube is secured by the elastic force generated by the deformation of the O-rings. However, in actual use, the O-rings often age due to repeated insertion and removal of the sample tubes, necessitating replacement of the aged O-rings. Alternatively, the O-rings may become contaminated due to frequent use, necessitating cleaning. Both replacement and cleaning operations require disassembly and assembly of the O-rings, which are extremely inconvenient because they are embedded in the rotor's inner wall. Summary of the Invention

[0004] The present invention proposes a double-layered, assemblable liquid nuclear magnetic resonance rotor based on 3D printing to address the shortcomings of the above-mentioned prior art. The double-layered, assemblable liquid nuclear magnetic resonance rotor has an excellent fixation effect on sample tubes, and the fixings can be easily and quickly replaced and cleaned in the event of rotor aging or contamination.

[0005] The technical solution of the present invention is: a double-layer assemblable liquid nuclear magnetic resonance rotor based on 3D printing, comprising:

[0006] The rotor body is a hollow tubular structure, and a plurality of longitudinal through grooves are evenly arranged in the inner cavity of the rotor body.

[0007] The inner tube is a flexible tube, which is arranged inside the rotor body. The outer wall of the inner tube is provided with multiple connecting strips embedded in the longitudinal through grooves. The longitudinal through grooves and the connecting strips are interference fit. The inner tube is provided with multiple annular cavities distributed along the length of the tube body. The inner wall of the inner tube is provided with multiple annular protrusions at multiple annular cavities; the annular cavities are used to provide avoidance space for the annular protrusions, and the annular protrusions are used to clamp the sample tube.

[0008] In at least one embodiment of the present invention, the cross-sections of the plurality of annular protrusions are all trapezoidal.

[0009] In at least one embodiment of the present invention, the rotor body is made of ABS, PETG, PLA or photocurable resin, and the inner tube is made of TPU, where:

[0010] The full English name of ABS is: Acrylonitrile Butadiene Styrene plastic, and the Chinese name is: ternary copolymer of acrylonitrile (A)-butadiene (B)-styrene (S).

[0011] The full English name of PETG is: polyethylene terephthalate-I,4-cyclohexanedimethyleneterephthalate, and the Chinese name is: amorphous copolyester.

[0012] The full English name of PLA is: polylactic acid, and the Chinese name is: polylactic acid.

[0013] The full English name of TPU is: Thermoplastic polyurethanes, and the Chinese name is: thermoplastic polyurethane elastomer.

[0014] In at least one embodiment of the present invention, both the rotor body and the inner tube are integrally formed.

[0015] In at least one embodiment of the present invention, both the rotor body and the inner tube are integrally formed by 3D technology.

[0016] In at least one embodiment of the present invention, the number of the longitudinal through grooves and the connecting strips is three each; the number of the annular cavities and the annular protrusions is three each; the three annular cavities and the three annular protrusions are evenly distributed on the inner tube.

[0017] In at least one embodiment of the present invention, the height of the plurality of annular cavities is greater than the height of the plurality of annular protrusions.

[0018] In at least one embodiment of the present invention, the plurality of longitudinal through grooves are all arc-shaped grooves, and the cross-sections of the plurality of connecting strips are all arcs adapted to the longitudinal through grooves.

[0019] In at least one embodiment of the present invention, the length of the inner tube is greater than the length of the inner cavity of the rotor body.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The present invention designs the liquid nuclear magnetic resonance rotor as a double-layer assembled structure of a rotor body and an inner tube, abandoning the traditional fixed design concept of the O-ring. It relies on multiple annular protrusions provided on the inner wall of the inner tube to clamp and fix the sample tube. Moreover, an annular cavity for the annular protrusions to avoid is provided on the inner tube, so that the clamping force of the annular protrusions on the sample tube is moderate. When the assembled liquid nuclear magnetic resonance rotor ages or gets soiled during daily use, since the entire rotor is a double-layer assembled structure composed of a rotor body and an inner tube, and longitudinal through grooves are provided on the inner wall of the rotor body, and connection strips are provided on the outer wall of the inner tube, and the longitudinal through grooves and the connection strips are in interference fit, only the rotor body needs to be fixed and the inner tube is pulled out, and the inner tube can be quickly disassembled from the rotor body for replacement or cleaning, making the maintenance of the nuclear magnetic resonance rotor more convenient.

[0022] 2. When the present invention is used in non-rotating liquid nuclear magnetic resonance experiments, due to the strong impact resistance of the material of the rotor body itself, it generally will not be damaged in case of accidental situations such as dropping. Compared with the nuclear magnetic resonance rotors in the prior art, it has a longer service life. Even if it breaks, since the inner tube is flexible and the inner tube is frictionally connected to the rotor body, the inner tube can also connect the broken rotor body into a whole, thus facilitating the cleaning of the broken rotor body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the front view structural schematic diagram of the rotor body of the present invention;

[0024] Figure 2 is the three-dimensional structural schematic diagram of the rotor body of the present invention;

[0025] Figure 3 is the front view sectional structural schematic diagram of the rotor body of the present invention;

[0026] Figure 4 is the front view structural schematic diagram of the inner tube of the present invention;

[0027] Figure 5 is the front view sectional structural schematic diagram of the inner tube of the present invention;

[0028] Figure 6 is of the present invention Figure 5 detailed structural schematic diagram.

[0029] DESCRIPTION OF THE REFERENCE NUMERALS:

[0030] 1. Rotor body; 11. Longitudinal through groove; 2. Inner tube; 21. Connection strip; 22. Annular cavity; 23. Annular protrusion. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The attached drawings in the present invention are not strictly drawn according to actual proportions, and the specific sizes and quantities of each structure can be determined according to actual needs. The attached drawings described in the present invention are only schematic structural diagrams.

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the attached drawings of the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0033] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. "Inside", "outside", "above", "below", "far", "near", "front", "rear", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0034] When the existing liquid nuclear magnetic resonance rotor fixes the sample tube, the commonly used fixing part is an O-ring. By setting a plurality of circular grooves on the inner cavity side wall of the rotor and installing an O-ring with an inner diameter smaller than that of the sample tube in the circular grooves, the sample tube is fixed by the elastic force generated by the deformation of the O-ring. However, in the actual use process, the O-ring often ages due to the repeated insertion and extraction of the sample tube, or is soiled due to frequent use. But because the O-ring is embedded in the inner wall of the rotor, when replacing or cleaning the O-ring, it is extremely inconvenient to disassemble and assemble the O-ring, and special disassembly tools are often required. Moreover, in order to have good coaxiality during rotation, the liquid nuclear magnetic resonance rotor uses a plastic material with strong rigidity, resulting in poor toughness. And during the daily experimental process, the liquid nuclear magnetic resonance rotor often drops. The existing liquid nuclear magnetic resonance rotor can often be broken by the impact force when falling from a height of less than 1 meter.

[0035] In view of this, the present invention proposes a double-layer assemblable liquid nuclear magnetic resonance rotor based on 3D printing. The double-layer assemblable liquid nuclear magnetic resonance rotor does not have the aging and elastic fatigue problems of traditional rubber rings, has a good fixing effect on the sample tube, and the inner tube not only tightens the sample tube but is also easy to replace, avoiding the problems of broken tubes being difficult to clean and dirty rotors being difficult to clean.

[0036] Combine Figures 1 to 6 As shown, a double-layer assemblable liquid nuclear magnetic resonance rotor based on 3D printing includes:

[0037] The rotor body 1 is a hollow tubular structure, and a plurality of longitudinal through grooves 11 are evenly arranged in the inner cavity of the rotor body 1 .

[0038] The inner tube 2 is a flexible tube. The inner tube 2 is arranged inside the rotor body 1. The outer wall of the inner tube 2 is provided with multiple connecting strips 21 embedded in the longitudinal through grooves 11. The longitudinal through grooves 11 and the connecting strips 21 are interference fit. A plurality of annular cavities 22 are distributed on the inner tube 2 along the length of the tube body. A plurality of annular protrusions 23 are provided at the multiple annular cavities 22 on the inner wall of the inner tube 2; the annular cavities 22 are used to provide avoidance space for the annular protrusions 23, and the annular protrusions 23 are used to clamp the sample tube; compared with ordinary O-rings, the annular protrusions 23 have a higher wrapping degree for the sample tube and a stronger fixed friction force. The annular cavities 22 can increase the recovery range of the annular protrusions 23; the inner tube 2 utilizes the good toughness of the material, so that the liquid nuclear magnetic resonance rotor does not have the aging and elastic fatigue problems of traditional rubber rings.

[0039] As an alternative embodiment, the cross-sections of the multiple annular protrusions 23 are all trapezoidal, and the trapezoids are isosceles trapezoids. The trapezoidal design of the cross-section of the annular protrusions 23 prevents the annular protrusions 23 from blocking the sample tube when the sample tube passes into the inner tube 2. In addition to the trapezoidal shape given in this embodiment, the cross-sectional shape of the annular protrusions 23 can also be designed as an arc shape.

[0040] As an alternative embodiment, the rotor body 1 is made of a hard material such as ABS, PETG, PLA or light-curable resin, and the inner tube 2 is made of a flexible material such as TPU, wherein:

[0041] The full English name of ABS is: Acrylonitrile Butadiene Styrene plastic, and its Chinese name is: terpolymer of acrylonitrile (A)-butadiene (B)-styrene (S).

[0042] The full English name of PETG is: polyethylene terephthalate-I, 4-cyclohexanedimethyleneterephthalate, and its Chinese name is: non-crystalline copolyester.

[0043] The full English name of PLA is: polylactic acid, and the Chinese name is: polylactic acid.

[0044] The full English name of TPU is: Thermoplastic polyurethanes, and the Chinese name is: thermoplastic polyurethane elastomer.

[0045] Specifically, the TPU material has the following advantages:

[0046] 1. High mechanical strength, with outstanding load-bearing capacity, impact resistance and shock absorption performance of the product.

[0047] 2. Outstanding cold resistance: The glass transition temperature of TPU is relatively low, and it still maintains good elasticity, flexibility and other physical properties at -35 degrees Celsius. TPU is flexible within a very wide temperature range, such as -40°C to 120°C, without the need for plasticizers. Compared with traditional O-ring rubber, it is generally difficult to withstand the high or low temperature changes of the nuclear magnetic resonance, and it usually becomes brittle and easy to break at low temperatures. The TPU material is more suitable as the inner tube 2.

[0048] 3. The wear resistance, tear resistance and flexural strength of the TPU material are excellent; high tensile strength, large elongation at break, and low long-term compression set rate are all significant advantages of TPU.

[0049] The above advantages make the TPU material more suitable for producing the inner tube 2. In actual production, since the materials of the rotor body 1 and the inner tube 2 are diverse, in order to ensure the tight connection between the rotor body 1 and the inner tube 2, when using different materials to make the rotor body 1, only the inner diameter of the rotor body 1 needs to be slightly adjusted.

[0050] As an alternative embodiment, the rotor body 1 and the inner tube 2 are both integrally formed. The integrally formed method can make the rotor body 1 and the inner tube 2 generate fewer or no manufacturing joints, thereby making the structure of this rotor more stable and the rotor itself more durable.

[0051] As an alternative embodiment, the rotor body 1 and the inner tube 2 are both integrally formed by 3D technology; using 3D technology to produce this product, compared with other integrally formed methods, such as injection molding, etc., the produced product, while ensuring the annular cavity 22, has no manufacturing joints at all, and the structural performance of the rotor is better.

[0052] As an alternative embodiment, the number of longitudinal through grooves 11 and connecting strips 21 is three each; the number of annular cavities 22 and annular protrusions 23 is three each; the three annular cavities 22 and the three annular protrusions 23 are evenly distributed on the inner tube 2.

[0053] As an alternative embodiment, the heights of the plurality of annular cavities 22 are all greater than the heights of the plurality of annular protrusions 23; because the principle is that the sample tube squeezes the annular protrusions 23 to obtain sufficient clamping force. The annular cavities 22 provide sufficient deformation space for the annular protrusions 23 to avoid excessive clamping force and damaging the sample tube. Therefore, the clamping force is determined by the inner diameter of the annular protrusions 23. The smaller the inner diameter, the greater the clamping force. As long as the annular cavities 22 have enough space to ensure that the annular protrusions 23 have enough space to deform.

[0054] As an alternative embodiment, the plurality of longitudinal through grooves 11 are all arc-shaped grooves, and the cross-sections of the plurality of connecting strips 21 are all arcs adapted to the longitudinal through grooves 11. The design of the arcs of the cross-sections of the connecting strips 21 and the longitudinal through grooves 11 facilitates the rapid assembly of the inner tube 2 and the rotor body 1.

[0055] As an alternative embodiment, the length of the inner tube 2 is greater than the length of the inner cavity of the rotor body 1. During the assembly process of the inner tube 2 and the rotor body 1, when the inner tube 2 is inserted into the inner cavity of the rotor body 1, by pressing the protruding top of the inner tube 2, the inner tube 2 can be deformed and expanded, so that the rotor body 1 and the inner tube 2 are tightly assembled into one body.

[0056] The working principle and usage method of this embodiment:

[0057] The present invention provides a double-layer assembled liquid nuclear magnetic resonance rotor based on 3D printing. When using this double-layer assembled liquid nuclear magnetic resonance rotor, first align the plurality of connecting strips 21 on the inner tube 2 with the longitudinal through grooves 11 in the inner cavity of the rotor body 1, install the inner tube 2 in the rotor body 1, and then press the top of the inner tube 2 to cause the outer diameter of the inner tube 2 and the connecting strips 21 to expand and deform, so that the inner tube 2 and the rotor body 1 are tightly assembled into one body.

[0058] During liquid nuclear magnetic resonance, insert the sample tube into the inner tube 2. During the insertion process of the sample tube, squeeze the annular protrusions 23. The annular protrusions 23 are displaced towards the annular cavities 22 under the squeezing force, so that the plurality of annular protrusions 23 clamp and fix the sample tube.

[0059] During daily use, if the rotor body or the inner tube is damaged or soiled, the inner tube 2 can be quickly and conveniently detached from the rotor body 1 for cleaning; if the rotor body 1 falls, since the rotor body 1 has strong impact resistance, the whole device will not break. Even if it breaks, because the inner tube 2 is flexible and the connection between the inner tube 2 and the rotor body 1 is a friction connection, the inner tube 2 can still connect the broken rotor body 1 into a whole, which is convenient for cleaning the broken rotor body 1.

[0060] The above embodiments are only specific implementation manners of the present invention patent, which are used to illustrate the technical solutions of the present invention patent, rather than limiting it. The protection scope of the present invention patent is not limited thereto. Although the present invention patent has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or make equivalent replacements for some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions implemented by the present invention patent, and should all be covered within the protection scope of the present invention.

Claims

1. A double-layer assembled liquid nuclear magnetic resonance rotor based on 3D printing, characterized in that include: The rotor body (1) is a hollow tubular structure, and a plurality of longitudinal through grooves (11) are evenly arranged in the inner cavity of the rotor body (1); The inner tube (2) is a flexible tube. The length of the inner tube (2) is greater than the length of the inner cavity of the rotor body (1). The inner tube (2) is arranged inside the rotor body (1). The outer wall of the inner tube (2) is provided with a plurality of connecting strips (21) embedded in the longitudinal grooves (11). The longitudinal grooves (11) and the connecting strips (21) are interference fit. The inner tube (2) is provided with a plurality of annular cavities (22) along the length direction of the tube body. A plurality of annular protrusions (23) are provided at the plurality of annular cavities (22) on the inner wall of the inner tube (2). The cross sections of the plurality of annular protrusions (23) are all trapezoidal. The heights of the plurality of annular cavities (22) are all greater than the heights of the plurality of annular protrusions (23). The annular cavities (22) are used to provide an escape space for the annular protrusions (23), and the annular protrusions (23) are used to clamp the sample tube. The number of the longitudinal through grooves (11) and the connecting strips (21) is three; the number of the annular cavities (22) and the annular protrusions (23) is three; the three annular cavities (22) and the three annular protrusions (23) are evenly distributed on the inner tube (2); The plurality of longitudinal through grooves (11) are all arc-shaped grooves, and the cross sections of the plurality of connecting strips (21) are all arc-shaped to match the longitudinal through grooves (11); The assembling method of the double-layer assemblable liquid nuclear magnetic resonance rotor based on 3D printing comprises the following steps: The plurality of connecting strips (21) on the inner tube (2) are aligned with the longitudinal through slots (11) in the inner cavity of the rotor body (1), and the inner tube (2) is pushed into the rotor body (1); the top of the inner tube (2) is then pressed to cause the outer diameter of the inner tube (2) and the connecting strips (21) to expand and deform, thereby tightly assembling the inner tube (2) and the rotor body (1) into one.

2. The double-layer assembled liquid nuclear magnetic resonance rotor based on 3D printing according to claim 1, characterized in that, The material of the rotor body (1) is ABS, PETG, PLA or light-curing resin, and the material of the inner tube (2) is TPU.

3. The double-layer assembled liquid nuclear magnetic resonance rotor based on 3D printing according to claim 1, wherein The rotor body (1) and the inner tube (2) are both integrally formed.

4. The double-layer assembled liquid nuclear magnetic resonance rotor based on 3D printing according to claim 3, characterized in that, The rotor body (1) and the inner tube (2) are both integrally formed using 3D technology.

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