Nuclear magnetic resonance detection system for railway engineering frozen soil detection

Abstract

The utility model relates to the technical field of rail transit, in particular to a nuclear magnetic resonance detection system for railway engineering frozen soil detection, which can improve the recycling efficiency of materials, and comprises a nuclear magnetic resonance device, the constant temperature system comprises or is connected to the heating system; the volumetric flask is used for containing volatile liquid, is arranged in the constant temperature system and comprises a bottle cap, and the bottle cap is provided with a circulation liquid inlet, a recovery liquid inlet, a liquid outlet and a gas outlet; the sample holder is arranged in the nuclear magnetic resonance device and comprises an inner space for accommodating a nuclear magnetic resonance detection sample, a holder inlet communicated with the inner space, and a holder outlet communicated with the inner space and connected with the circulating liquid inlet; the circulating pump comprises a pump inlet connected with the liquid outlet and a pump outlet connected with the clamp holder inlet; and the steam condensation liquid collection bottle comprises a recovery inlet connected with the gas outlet and a recovery outlet connected with the recovery liquid inlet.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transportation, in particular to a nuclear magnetic resonance detection system for frozen soil detection in railway engineering. Background Art

[0002] Numerous railways are built in permafrost regions in the northwest and northeast. Frost heave and thaw settlement in seasonally frozen areas is a major foundational hazard for railway construction and operation in these regions. Frost heave of the roadbed is primarily caused by the migration of unfrozen water under the influence of temperature gradients. In winter, the ground temperature is low, causing the roadbed soil to freeze. Meanwhile, the underground temperature is high, causing groundwater to migrate upward through unfrozen water channels along the soil. Once it reaches the roadbed, it freezes, causing frost heave. During high summer temperatures, the frozen soil thaws, rapidly reducing its strength and leading to thaw settlement damage.

[0003] The migration of water in soil driven by temperature gradients is directly related to the soil's pore structure (pore size, distribution, and interconnectedness). In nuclear magnetic resonance (NMR) technology, hydrogen protons in water molecules are used as probes to detect the size and distribution of soil pores. Therefore, to avoid detecting hydrogen protons from water bath heating when using NMR technology to detect water molecules in soil, a fluorinated liquid (which has no NMR signal) is used to conduct heat to the sample during the test. However, fluorinated liquids are expensive and volatile, so a solution is needed to recover and recycle these volatile liquids. Utility Model Content

[0004] An embodiment of the present utility model provides a nuclear magnetic resonance detection system for frozen soil detection in railway engineering, which can improve the recycling efficiency of materials.

[0005] According to one embodiment of the present invention, a nuclear magnetic resonance detection system for frozen soil detection in railway engineering is provided, comprising:

[0006] Nuclear magnetic resonance imaging equipment;

[0007] a thermostatic system including or connected to a heating system;

[0008] A volumetric flask for containing volatile liquids, which is placed in the constant temperature system and includes a bottle cap, wherein the bottle cap is provided with a liquid circulation inlet, a liquid recovery inlet, a liquid outlet, and a gas outlet;

[0009] A sample holder is placed in the nuclear magnetic resonance apparatus and comprises: an inner space for accommodating a nuclear magnetic resonance detection sample, a holder inlet connected to the inner space, and a holder outlet connected to the inner space and connected to the liquid flow inlet;

[0010] a circulation pump comprising: a pump inlet connected to the liquid outlet, and a pump outlet connected to the holder inlet;

[0011] The steam condensation liquid collecting bottle comprises: a recovery inlet connected to the gas outlet, and a recovery outlet connected to the recovery liquid inlet.

[0012] Preferably, in any embodiment,

[0013] The constant temperature system includes a constant temperature water bath system.

[0014] Preferably, in any embodiment,

[0015] A horizontally extending steam condensation plate is provided in the volumetric flask.

[0016] Preferably, in any embodiment,

[0017] The steam condensation liquid collecting bottle is located above the volumetric flask.

[0018] Preferably, in any embodiment,

[0019] The recovery inlet of the steam condensation liquid collection bottle is arranged at the top of the steam condensation liquid collection bottle.

[0020] Preferably, in any embodiment,

[0021] The recovery outlet of the steam condensation liquid collection bottle is arranged at the bottom of the steam condensation liquid collection bottle.

[0022] Preferably, in any embodiment,

[0023] The recovery outlet of the steam condensation liquid collection bottle is higher than the recovery liquid inlet.

[0024] The nuclear magnetic resonance detection system for frozen soil detection in railway projects provided by the embodiment of the present utility model can improve the recycling efficiency of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the drawings are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments and their drawings can be obtained based on the embodiments shown in these drawings without paying any creative work.

[0026] Figure 1 The figure is a schematic structural diagram of a nuclear magnetic resonance detection system for frozen soil detection in railway engineering according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions of various embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments described in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The embodiment of the utility model provides a nuclear magnetic resonance detection system for frozen soil detection in railway engineering, which can improve the recycling efficiency of materials.

[0029] According to one embodiment of the present invention, a nuclear magnetic resonance detection system for frozen soil detection in railway engineering is provided, comprising:

[0030] Nuclear magnetic resonance imaging equipment;

[0031] a thermostatic system including or connected to a heating system;

[0032] A volumetric flask for containing volatile liquids, which is placed in the constant temperature system and includes a bottle cap, wherein the bottle cap is provided with a liquid circulation inlet, a liquid recovery inlet, a liquid outlet, and a gas outlet;

[0033] A sample holder is placed in the nuclear magnetic resonance apparatus and comprises: an inner space for accommodating a nuclear magnetic resonance detection sample, a holder inlet connected to the inner space, and a holder outlet connected to the inner space and connected to the liquid flow inlet;

[0034] a circulation pump comprising: a pump inlet connected to the liquid outlet, and a pump outlet connected to the holder inlet;

[0035] The steam condensation liquid collecting bottle comprises: a recovery inlet connected to the gas outlet, and a recovery outlet connected to the recovery liquid inlet.

[0036] In this way, when using the volatile liquid contained in the volumetric flask (for example, a fluorinated liquid that can achieve good heat conduction and does not affect nuclear magnetic resonance detection) to conduct heat to the sample contained in the sample holder, on the one hand, a circulation pump is used to extract the volatile liquid in the volumetric flask through the liquid outlet of the volumetric flask and transport it to the inner space of the sample holder to conduct heat to the sample (heating or cooling), and the volatile liquid can be further made to flow back into the volumetric flask through the circulation inlet of the volumetric flask after leaving the sample holder, thereby realizing the circulation of the volatile liquid and heat conduction to the sample in the sample holder; on the other hand, the steam condensation liquid collection bottle is used to recover the volatile liquid (gaseous) evaporated through the gas outlet of the volumetric flask and the liquefied volatile liquid can be returned to the volumetric flask through the recovery inlet of the volumetric flask, thereby realizing the recovery and recycling of the volatile liquid.

[0037] Among them, the use of a circulation pump can speed up the rapid circulation of volatile liquids, which not only improves work efficiency but also reduces heat loss in the circulation process.

[0038] In addition, by setting up multiple inlets and outlets (such as the circulating liquid inlet, recovery liquid inlet, liquid outlet, and air outlet) of the volumetric flask, the air pressure inside and outside the bottle can be balanced (for example, the pressure inside the volumetric flask can be consistent with the atmospheric pressure) to ensure safe operation.

[0039] In the nuclear magnetic resonance detection system for frozen soil detection of railway engineering as described in the present application, the frozen soil sample in the sample holder is detected by a nuclear magnetic resonance device to accurately measure the information (such as unfrozen water content, soil state, etc.) of frozen soil in the railway roadbed in high-altitude cold areas. Wherein, a volatile liquid (such as fluorinated liquid) without nuclear magnetic signal is particularly used as a good heat transfer medium to the frozen soil sample. On the one hand, it will not affect the measurement accuracy of the nuclear magnetic resonance device, and on the other hand, the temperature of the sample can also be efficiently controlled to facilitate nuclear magnetic resonance detection. In addition, by providing a heat conduction system (such as the constant temperature system, volumetric flask, circulating pump, steam condensation liquid collection bottle, etc.) that can recycle volatile liquid, the efficient recycling of volatile liquid (such as fluorinated liquid) can be achieved, reducing the consumption of volatile liquid as heat transfer medium, so as to reduce maintenance cost, and is a kind of efficient and environmentally friendly use method.

[0040] It can be seen that the nuclear magnetic resonance detection system for frozen soil detection in railway engineering provided by the embodiment of the present utility model can improve the efficiency of material recycling.

[0041] Preferably, in any embodiment, the constant temperature system comprises a constant temperature water bath system.

[0042] Optionally, in any embodiment, the heating system comprises: a heating tube surrounding the volumetric flask.

[0043] Optionally, in any embodiment, the heating tube extends in a spiral around the volumetric flask.

[0044] Preferably, in any embodiment, a horizontally extending vapor condensation plate is provided in the volumetric flask. In this case, the vapor condensation plate (e.g., a metal plate) can help condense the escaping vapor of the volatile liquid into liquid for heat conduction with the sample, thereby improving operating efficiency.

[0045] Preferably, in any embodiment, the steam condensation liquid collecting bottle is located above the volumetric flask. Like this, the vapor of volatile liquid (such as low density vapor) can be more easily moved upwards and recovered in the steam condensation liquid collecting bottle.

[0046] Preferably, in any embodiment, the recovery inlet of the vapor condensate collection bottle is arranged at the top of the vapor condensate collection bottle. In this way, the vapor of the volatile liquid (e.g., low-density vapor) can more easily move upward and enter the vapor condensate collection bottle from the recovery inlet at the top.

[0047] Preferably, in any embodiment, the recovery outlet of the vapor condensate collecting bottle is arranged at the bottom of the vapor condensate collecting bottle. In this way, the volatile liquid deposited at the bottom can more easily leave the vapor condensate collecting bottle through the recovery outlet at the bottom and return to the volumetric flask.

[0048] Preferably, in any embodiment, the recovery outlet of the vapor condensation liquid collection bottle is higher than the recovery liquid inlet. In this way, gravity can be used to move the recovered liquefied volatile liquid downward from the recovery liquid inlet back to the volumetric flask.

[0049] Optionally, in any embodiment, the vapor condensate collecting bottle is provided with or connected to a cooling system. In this way, the vapor of the volatile liquid recovered in the vapor condensate collecting bottle can be liquefied at a cooling temperature and converted back into a liquid state, which is conducive to returning the volatile liquid to the volumetric flask through the recovery liquid inlet.

[0050] Optionally, in any embodiment, an air outlet pipe including the air outlet is provided on the bottle cap.

[0051] Optionally, in any embodiment, the outlet of the gas outlet pipe in the volumetric flask is a predetermined distance above the liquid level.

[0052] Optionally, in any embodiment, the air outlet tube is adjustably mounted to the bottle cap.

[0053] Optionally, in any embodiment, a recovery liquid inlet pipe including the recovery liquid inlet is provided on the bottle cap.

[0054] Optionally, in any embodiment, the recovery liquid inlet of the recovery liquid inlet tube in the volumetric flask is higher than the liquid level.

[0055] Optionally, in any embodiment, the recovery liquid inlet of the recovery liquid inlet tube in the volumetric flask is lower than the gas outlet of the gas outlet tube in the volumetric flask.

[0056] Figure 1 The figure is a schematic structural diagram of a nuclear magnetic resonance detection system for frozen soil detection in railway engineering according to an embodiment of the present utility model.

[0057] exist Figure 1 In the embodiment shown, a nuclear magnetic resonance detection system for frozen soil detection in railway engineering can be seen, which includes:

[0058] Nuclear magnetic resonance imaging equipment;

[0059] A constant temperature system 100 , which includes or is connected to a heating system 110 ;

[0060] A volumetric flask 300 for containing volatile liquids, which is placed in the constant temperature system and includes a bottle cap, wherein the bottle cap is provided with a liquid circulation inlet, a liquid recovery inlet, a liquid outlet, and a gas outlet;

[0061] A sample holder 500 is placed in the NMR apparatus and comprises: an inner space for accommodating a sample for NMR detection, a holder inlet connected to the inner space, and a holder outlet connected to the inner space and connected to the liquid flow inlet;

[0062] a circulation pump 600 comprising: a pump inlet connected to the liquid outlet, and a pump outlet connected to the holder inlet;

[0063] The steam condensation liquid collecting bottle 800 comprises: a recovery inlet connected to the gas outlet, and a recovery outlet connected to the recovery liquid inlet.

[0064] The nuclear magnetic resonance detection system for frozen soil detection in railway projects provided by the embodiment of the present utility model can improve the recycling efficiency of materials.

[0065] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements not only includes these elements, but also includes other elements not clearly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements limited by the sentence "comprising a..." do not exclude the presence of other identical factors in the process, method, article or equipment comprising the elements.

[0066] In the description of multiple elements herein, multiple parallel features connected by "and / or" refer to one or more (or one or more) of these parallel features. For example, "a first element and / or a second element" means: one or more of the first element and the second element, that is, only the first element, or only the second element, or both the first element and the second element.

[0067] The various embodiments provided in the present invention can be combined with each other as needed. For example, the features of any two, three or more embodiments can be combined with each other to form a new embodiment of the present invention. This is also within the scope of protection of the present invention, unless otherwise stated or technically inconsistent and cannot be implemented.

[0068] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A nuclear magnetic resonance detection system for frozen soil detection in railway engineering, characterized in that: include: Nuclear magnetic resonance imaging equipment; a thermostatic system including or connected to a heating system; A volumetric flask for containing volatile liquids, which is placed in the constant temperature system and includes a bottle cap, wherein the bottle cap is provided with a liquid circulation inlet, a liquid recovery inlet, a liquid outlet, and a gas outlet; A sample holder is placed in the nuclear magnetic resonance apparatus and comprises: an inner space for accommodating a nuclear magnetic resonance detection sample, a holder inlet connected to the inner space, and a holder outlet connected to the inner space and connected to the liquid flow inlet; a circulation pump comprising: a pump inlet connected to the liquid outlet, and a pump outlet connected to the holder inlet; The steam condensation liquid collecting bottle comprises: a recovery inlet connected to the gas outlet, and a recovery outlet connected to the recovery liquid inlet.

2. The nuclear magnetic resonance detection system for frozen soil detection in railway engineering according to claim 1, characterized in that: The constant temperature system includes a constant temperature water bath system.

3. The nuclear magnetic resonance detection system for frozen soil detection in railway engineering according to claim 1, characterized in that: A horizontally extending steam condensation plate is provided in the volumetric flask.

4. The nuclear magnetic resonance detection system for frozen soil detection in railway engineering according to claim 1, characterized in that: The steam condensation liquid collecting bottle is located above the volumetric flask.

5. The nuclear magnetic resonance detection system for frozen soil detection in railway engineering according to claim 1, characterized in that: The recovery inlet of the steam condensation liquid collection bottle is arranged at the top of the steam condensation liquid collection bottle.

6. The nuclear magnetic resonance detection system for frozen soil detection in railway engineering according to claim 1, characterized in that: The recovery outlet of the steam condensation liquid collection bottle is arranged at the bottom of the steam condensation liquid collection bottle.

7. The nuclear magnetic resonance detection system for frozen soil detection in railway engineering according to claim 1, characterized in that: The recovery outlet of the steam condensation liquid collection bottle is higher than the recovery liquid inlet.

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