Vacuum liquid barrier and cryogenic multi-user system

Abstract

The present invention discloses a vacuum liquid barrier and a cryogenic multi-user system, comprising a barrier shell, a liquid inlet inner tube and a liquid outlet inner tube arranged in sections, the barrier shell has a cavity for accommodating cryogenic liquid inside, the bottom end of the liquid inlet inner tube and the top end of the liquid outlet inner tube are sealed in the cavity, the internal space of the cavity, the liquid inlet inner tube portion accommodated in the cavity and the liquid outlet inner tube portion accommodated in the cavity together form a barrier capable of blocking heat transfer; the vacuum insulated pipe of the cryogenic multi-user system is provided with the above-mentioned vacuum liquid barrier. In the above manner, the vacuum liquid barrier and the cryogenic multi-user system of the present invention arrange the vacuum liquid barrier inside the vacuum pipe, which does not affect the external dimensions, has a compact structure, does not occupy the user's on-site space, has low cost, can cut off the upper and lower cold and heat exchange paths, thereby effectively avoiding frost or ice formation in the non-vacuum pipe section at the end of the front-end use point.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic liquids, and in particular to a vacuum liquid barrier and a cryogenic multi-user system. Background Art

[0002] When using vacuum insulated pipes to transport cryogenic liquid to the user end, there are often multiple user use points. In a multi-user use system, the demand time for cryogenic liquid at each user point is different: when the front-end user does not use liquid and the back-end user uses liquid, the cryogenic liquid will first pass through the branch tee at the front-end user point and then flow to the back-end user use point.

[0003] In a vacuum insulated piping system, the main pipeline is often set relatively high, and each use point is at a lower position. In this way, when the cryogenic liquid flows from the front end to the rear end, the front use point is at a low position, and the liquid flowing through is heavier than the gas. As a result, the branch pipeline descending from the front use point is filled with cryogenic liquid and forms a heat exchange (convection), causing frost or even ice to form on the non-vacuum pipe section at the end of the front use point, increasing the heat input of the cryogenic liquid.

[0004] like Figure 1 As shown, when all devices do not use liquid, the entire vacuum pipeline system is filled with room temperature gas; when user 7 or user 8 in the system uses liquid and other branches do not use liquid, when the cryogenic liquid flows through the front ABC branch, because the density of the cryogenic liquid is greater than that of the room temperature gas, there is a cold and hot convection exchange in each pipeline branch, that is, the cold liquid or cold air will be transmitted to the bottom non-vacuum insulation end.

[0005] Since the temperature of the cold liquid or cold air is generally lower than -120℃, the temperature of the outer surface of the steel pipe at the non-vacuum insulation end at the bottom is often -20℃~-40℃. The surrounding water vapor outside the pipe will frost and freeze when it is cooled, and the ice ball will become larger and larger.

[0006] The prior art generally adopts a vacuum valve and a vacuum hose at the use end, or directly adopts a U-shaped elbow structure to avoid the problem of frost and ice.

[0007] When using vacuum valves and vacuum hoses, there are still problems of hot and cold convection and heat exchange in the branches. Only by making the vacuum hose longer and forming a U-shaped or S-shaped bend when connected to the equipment can it play the role of a barrier. However, because the required vacuum hose is relatively long, on the one hand, the cost is high, and on the other hand, the bending shape affects the aesthetics. Third, it is difficult to maintain the vacuum degree of the vacuum hose for a long time. After the vacuum drops, frost will form on the surface, and the maintenance cost is very high, resulting in a very high overall cost of the solution.

[0008] like Figure 2As shown, when the U-shaped vacuum elbow structure is adopted, a "liquid seal" effect is achieved, but the U-shaped vacuum elbow will occupy a large installation space. In some occasions where space is tight, it is impossible to add a U-shaped elbow, and the appearance structure is not simple, and the general user acceptance is not high. Summary of the invention

[0009] The main technical problem solved by the present invention is to provide a vacuum liquid barrier and a deep-cold multi-user system. The vacuum liquid barrier is arranged inside the vacuum pipeline, which does not affect the external dimensions, has a compact structure, does not occupy the user's on-site space, has low cost, and can cut off the upper and lower cold and heat exchange paths, thereby effectively avoiding frost or ice on the non-vacuum pipe section at the end of the front-end use point.

[0010] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a vacuum liquid barrier, which is arranged in a vacuum insulation pipeline, comprising: a barrier shell, the barrier shell has a cavity for accommodating cryogenic liquid, and the top and bottom ends of the cavity are respectively provided with a first opening and a second opening,

[0011] The device also includes a liquid inlet inner tube and a liquid outlet inner tube which are arranged in sections, wherein the bottom end of the liquid inlet inner tube is inserted into the lower end of the cavity through the first opening, the upper end of the liquid outlet inner tube is arranged at the upper end of the cavity, and the liquid outlet inner tube extends downward through the second opening.

[0012] The inner space of the cavity, the liquid inlet inner tube portion accommodated in the cavity, and the liquid outlet inner tube portion accommodated in the cavity together form a barrier capable of blocking heat transfer.

[0013] In a preferred embodiment of the present invention, the first opening of the cavity is sealed by the liquid inlet inner tube, and the second opening of the cavity is sealed by the liquid outlet inner tube.

[0014] In a preferred embodiment of the present invention, the liquid inlet inner tube portion accommodated in the cavity includes a vertical liquid inlet section extending vertically downward from the first opening and an inclined liquid inlet section extending obliquely downward from the bottom end of the vertical liquid inlet section, and the bottom position of the inclined liquid inlet section is the cryogenic liquid outlet point;

[0015] The inner liquid outlet tube portion accommodated in the cavity includes an inclined liquid outlet section and a vertical liquid outlet section extending vertically downward from the bottom of the inclined liquid outlet section toward the second opening direction, and the top position of the inclined liquid outlet section is the inlet point of the cryogenic liquid.

[0016] In a preferred embodiment of the present invention, the lengths of the inclined liquid inlet section and the inclined liquid outlet section are matched and the two are arranged in parallel, and there is a gap between the inclined liquid inlet section and the inclined liquid outlet section.

[0017] In a preferred embodiment of the present invention, the height of the cryogenic liquid outlet point is lower than the height of the cryogenic liquid inlet point.

[0018] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a cryogenic multi-user system, including: a storage tank, a vacuum insulation pipeline and at least two use points,

[0019] The vacuum insulation pipeline includes a vacuum shell, a main pipeline, at least one branch pipeline arranged downward from the tee of the main pipeline, and at least one liquid outlet inner pipe arranged toward the corresponding end use point.

[0020] The vacuum liquid barrier is arranged at the junction of the branch pipeline inside the vacuum shell and the inner liquid outlet pipe.

[0021] In a preferred embodiment of the present invention, the branch pipeline of the vacuum insulation pipeline is inserted into the lower end portion of the cavity inside the barrier shell through the first opening to form a liquid inlet inner tube, and the liquid outlet inner tube is arranged at the upper end portion of the cavity and extends toward the end use point through the second opening.

[0022] In a preferred embodiment of the present invention, the main pipeline, the branch pipeline and part of the upper liquid outlet inner tube are all arranged in the vacuum shell to form a vacuum section, the bottom end portion of the liquid outlet inner tube extends out of the vacuum shell to form a non-vacuum section, and the vacuum liquid barrier is located in the vacuum section.

[0023] In a preferred embodiment of the present invention, at least two user points are arranged at each usage point.

[0024] In a preferred embodiment of the present invention, the cryogenic liquid in the storage tank is transported to the corresponding user point through the main pipeline and the branch pipeline. When the cryogenic liquid flows to the user point at the rear end, the cryogenic liquid or cold gas flowing through the front branch pipeline will be blocked in the vacuum liquid barrier.

[0025] The beneficial effects of the present invention are as follows: the vacuum liquid barrier and the deep-cold multi-user system of the present invention arrange the vacuum liquid barrier inside the vacuum pipeline, which does not affect the external dimensions, has a compact structure, does not occupy the user's on-site space, has low cost, and can cut off the upper and lower cold and heat exchange paths, thereby effectively avoiding frost or ice formation in the non-vacuum pipe section at the end of the front-end use point. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0027] Figure 1 It is a structural schematic diagram of a preferred embodiment of a cryogenic multi-user system of the prior art;

[0028] Figure 2 It is a structural schematic diagram of a preferred embodiment of a double elbow combiner in a cryogenic multi-user system of the prior art;

[0029] Figure 3 It is a structural schematic diagram of a preferred embodiment of the vacuum liquid barrier of the present invention;

[0030] Figure 4 It is a structural schematic diagram of a preferred embodiment of a cryogenic multi-user system with a vacuum liquid barrier of the present invention;

[0031] The components in the accompanying drawings are marked as follows: 100, vacuum liquid barrier, 110, barrier housing, 120, liquid inlet inner tube, 121, vertical liquid inlet section, 122, inclined liquid inlet section, 130, liquid outlet inner tube, 131, inclined liquid outlet section, 132, vertical liquid outlet section, 140, cavity, 150, first opening, 160, second opening, 170, cryogenic liquid outlet point, 180, cryogenic liquid inlet point,

[0032] 200, storage tank, 300, vacuum insulation pipeline, 310, vacuum shell, 320, main pipeline, 330, branch pipeline, 3301, first branch pipeline, 3302, second branch pipeline, 3303, third branch pipeline, 3304, fourth branch pipeline, 340, vacuum section, 350, non-vacuum section,

[0033] 410, first usage point, 411, user one, 412, user two, 420, second usage point, 421, user three, 422, user four, 430, third usage point, 431, user five, 432, user six, 440, fourth usage point, 441, user seven, 442, user eight,

[0034] 500. Cryogenic liquid or cold gas, 600. Hot gas. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of 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.

[0036] See also Figure 3 to Figure 4 , the embodiment of the present invention includes: Example

[0037] A vacuum liquid barrier 100, such as Figure 3As shown, it is arranged in a vacuum insulation pipeline, including: a barrier shell 110, a liquid inlet inner tube 120 and a liquid outlet inner tube 130 arranged in sections, the barrier shell 110 has a cavity 140 for accommodating cryogenic liquid inside, and the top and bottom ends of the cavity 140 are respectively provided with a first opening 150 and a second opening 160,

[0038] The bottom end of the liquid inlet inner tube 120 is inserted into the lower end portion of the cavity 140 through the first opening 150, the upper end portion of the liquid outlet inner tube 130 is arranged at the upper end portion of the cavity 140, and the liquid outlet inner tube 130 extends downward to 160 through the second opening. The first opening 150 of the cavity 140 is sealed by the liquid inlet inner tube 120, and the second opening 160 of the cavity 140 is sealed by the liquid outlet inner tube 130, so that a sealed space is formed inside the entire cavity 140.

[0039] The inner space of the cavity 140 , the portion of the liquid inlet inner tube 120 accommodated in the cavity 140 , and the portion of the liquid outlet inner tube 130 accommodated in the cavity 140 together form a barrier capable of blocking heat transfer.

[0040] Specifically, the liquid inlet inner tube 120 portion accommodated in the cavity 140 includes a vertical liquid inlet section 121 extending vertically downward from the first opening 150 and an inclined liquid inlet section 122 extending obliquely downward from the bottom end of the vertical liquid inlet section 121. The liquid outlet inner tube 130 portion accommodated in the cavity 140 includes an inclined liquid outlet section 131 and a vertical liquid outlet section 132 extending vertically downward from the bottom of the inclined liquid outlet section 131 toward the second opening 160. The lengths of the inclined liquid inlet section 122 and the inclined liquid outlet section 131 are adapted and the two are arranged in parallel, and there is a gap between the inclined liquid inlet section 122 and the inclined liquid outlet section 131.

[0041] Furthermore, the bottom position of the inclined liquid inlet section 122 is the cryogenic liquid outlet point 170 , the top position of the inclined liquid outlet section 131 is the cryogenic liquid inlet point 180 , and the height of the cryogenic liquid outlet point 170 is lower than the height of the cryogenic liquid inlet point 180 .

[0042] Because the entrance from the vacuum liquid barrier 100 to the end use point is higher than the inlet, the density of the gas in the cold state is heavier than that of the hot gas. The upper part of the vacuum liquid barrier 100 is hot gas 600, and the lower part is cryogenic liquid or cold gas 500, so the cold cannot be transferred to the pipeline below the vacuum liquid barrier 100. In this way, the heat transfer is effectively terminated in the barrier, achieving the effect of "liquid seal". Example

[0043] A cryogenic multi-user system comprises: a storage tank 200, a vacuum insulation pipeline 300 and at least two use points, each of which is provided with at least two user points.

[0044] The vacuum insulated pipeline 300 includes a vacuum shell 310, a main pipeline 320, at least one branch pipeline 330 arranged downward from the tee of the main pipeline 320, and at least one liquid outlet inner tube 130 arranged toward the corresponding end use point. The vacuum liquid barrier 100 of Example 1 is arranged at the connection between the corresponding branch pipeline 330 and the liquid outlet inner tube 130 inside the vacuum shell 310.

[0045] In this embodiment, the upper ends of the main line 320, the branch line 330 and the liquid outlet inner tube 130 are all arranged in the vacuum shell 310 to form a vacuum section 340, the bottom end of the liquid outlet inner tube 130 extends out of the vacuum shell 310 to form a non-vacuum section 350, and the vacuum liquid barrier 100 is located in the vacuum section 340.

[0046] The vacuum liquid barrier 100 in the cryogenic multi-user system is arranged in the vacuum pipe of the vacuum section 340, and its appearance is exactly the same as that without this structural design. Moreover, the vacuum liquid barrier 100 has a compact structure, low cost, and does not affect the external dimensions. It can effectively solve the frost and ice problems caused by the heat exchange in the pipe in the multi-user system.

[0047] The branch pipeline 330 of the vacuum insulation pipeline 300 is inserted into the lower end of the cavity 140 of the barrier shell 110 through the first opening 150 to form a liquid inlet inner tube, and the liquid outlet inner tube 130 is arranged at the upper end of the cavity 140 and extends toward the end use point through the second opening 160.

[0048] The position of the cryogenic liquid outlet point 170 in the interior of the barrier housing 110, which descends from the branch line 330, is lower than the position of the cryogenic liquid inlet point 180 which descends from the interior of the barrier housing 110 to the point of use.

[0049] A vacuum liquid barrier 100 is provided at each branch pipeline 330, but does not include the branch pipeline at the current use point, so that the cryogenic liquid or cold gas can be blocked in the vacuum liquid barrier 100, thereby blocking the cold energy in the vacuum liquid barrier 100 and preventing it from being transmitted to the bottom non-vacuum section 350, thereby effectively avoiding the bottom icing phenomenon.

[0050] Specifically, in a vacuum pipeline system for transporting cryogenic liquids, users often have multiple devices, multiple branch pipelines 330, and multiple use points:

[0051] In the case of no liquid in the vacuum insulated pipeline of the cryogenic multi-user system, the pipeline from the branch pipeline 330 at the tee of the main pipeline 320 to the vacuum liquid barrier 100, and then from the vacuum liquid barrier 100 to the end use point is filled with nitrogen;

[0052] In this way, when the user point at the rear end uses liquid, the cryogenic liquid flows through the main line 320 to the branch line 330 at the front end three-way drop, and the cryogenic liquid forms a cold and hot convection exchange with the nitrogen between the branch line 330 at the three-way in the main line 320 and the vacuum liquid barrier 100.

[0053] Because the inlet from the vacuum liquid barrier 100 to the end use point is higher than the inlet, the density of the cryogenic liquid or cold gas 500 is heavier than that of the hot gas 600, and the "low in and high out" structure is set, so that the cryogenic liquid or cold gas 500 originally sealed between the vacuum liquid barrier 100 and the bottom use point can be blocked at the bottom of the vacuum liquid barrier.

[0054] The upper part of the vacuum liquid barrier is hot gas 600, and the lower part is cryogenic liquid or cold gas 500, thereby avoiding the heat and cold convection exchange, so that the cold inside the vacuum liquid barrier 100 cannot be transferred to the pipeline below the vacuum liquid barrier, and cannot be transferred to the non-vacuum section at the bottom, so that the heat transfer is effectively terminated in the barrier. Example

[0055] A deep-cold multi-user system, such as Figure 4 As shown, it includes a storage tank 200 and a vacuum insulated pipeline 300, and the vacuum insulated pipeline 300 includes a main pipeline 320 and a first branch pipeline 3301, a second branch pipeline 3302, a third branch pipeline 3303 and a fourth branch pipeline 3304 which are arranged downward from the tee of the main pipeline 320, a first use point 410 is arranged at the end of the first branch pipeline 3301, a second use point 420 is arranged at the end of the second branch pipeline 3302, a third use point 430 is arranged at the end of the third branch pipeline 3303; and a fourth use point 440 is arranged at the end of the fourth branch pipeline 3304.

[0056] The first branch pipeline 3301, the second branch pipeline 3302, the third branch pipeline 3303 and the fourth branch pipeline 3304 are all provided with vacuum liquid barriers 100, and the position of the cryogenic liquid outlet point 170 descending from the branch pipeline in the inner cavity of the barrier shell 110 is lower than the position of the cryogenic liquid inlet point 180 descending from the inner cavity of the barrier shell 110 to the use point.

[0057] The first usage point 410 is provided with user one 411 and user two 412 , the second usage point 420 is provided with user three 421 and user four 422 , the third usage point 430 is provided with user five 431 and user six 432 , and the fourth usage point 440 is provided with user seven 441 and user eight 442 .

[0058] When user seven 441 or user eight 442 in the system needs to use cryogenic liquid, and the first use point 410, the second use point 420 and the third use point 430 do not use liquid, when the cryogenic liquid flows through the first branch pipeline 3301, the second branch pipeline 3302 and the third branch pipeline 3303 at the front end, because the density of the cryogenic liquid or cold air is greater than that of the normal temperature gas, there is a cold and hot convection exchange in the first branch pipeline 3301, the second branch pipeline 3302 and the third branch pipeline 3303, that is, the cryogenic liquid or cold air will be transmitted down to the bottom non-vacuum insulation end.

[0059] Since a vacuum liquid barrier 100 is provided at each branch pipeline, and the vacuum liquid barrier 100 is provided with a "low-in and high-out" structure, the cryogenic liquid or cold gas originally sealed between the vacuum liquid barrier 100 and the bottom use point can be blocked at the bottom of the vacuum liquid barrier 100, thereby blocking the cold energy in the vacuum liquid barrier 100 and not transmitting downward to the bottom non-vacuum section 350, thereby effectively avoiding the bottom icing phenomenon.

[0060] The beneficial effects of the vacuum liquid barrier and the cryogenic multi-user system of the present invention are:

[0061] A vacuum liquid barrier is set inside the vacuum pipe, which is hidden inside the structure, does not affect the external dimensions, has a compact structure, does not occupy the user's on-site space, and has low cost;

[0062] The deep-cold liquid flowing through the front branch pipeline can be effectively blocked by gas, cutting off the upper and lower cold and heat exchange paths, thereby effectively avoiding frost or ice formation in the non-vacuum pipe section at the end of the front use point.

[0063] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vacuum liquid barrier, characterized in that: The device is arranged in a vacuum insulation pipe and comprises: a barrier shell, wherein the barrier shell has a cavity for accommodating a cryogenic liquid, and the top and bottom ends of the cavity are respectively provided with a first opening and a second opening, The device also includes a liquid inlet inner tube and a liquid outlet inner tube which are arranged in sections, wherein the bottom end of the liquid inlet inner tube is inserted into the lower end of the cavity through the first opening, the upper end of the liquid outlet inner tube is arranged at the upper end of the cavity, and the liquid outlet inner tube extends downward through the second opening. The first opening of the cavity is sealed by the liquid inlet inner tube, and the second opening of the cavity is sealed by the liquid outlet inner tube. The liquid inlet inner tube portion accommodated in the cavity includes a vertical liquid inlet section extending vertically downward from the first opening and an inclined liquid inlet section extending downwardly from the bottom end of the vertical liquid inlet section. The bottom position of the inclined liquid inlet section is the outlet point of the cryogenic liquid. The liquid outlet inner tube portion accommodated in the cavity includes an inclined liquid outlet section and a vertical liquid outlet section extending vertically downward from the bottom of the inclined liquid outlet section toward the second opening, and the top position of the inclined liquid outlet section is the inlet point of the cryogenic liquid; The height of the cryogenic liquid outlet point is lower than the height of the cryogenic liquid inlet point; The inner space of the cavity, the liquid inlet inner tube portion accommodated in the cavity, and the liquid outlet inner tube portion accommodated in the cavity together form a barrier capable of blocking heat transfer.

2. The vacuum liquid barrier according to claim 1, characterized in that: The lengths of the inclined liquid inlet section and the inclined liquid outlet section are matched and the two are arranged in parallel, and there is a gap between the inclined liquid inlet section and the inclined liquid outlet section.

3. A cryogenic multi-user system, characterized in that: include: Storage tanks, vacuum insulated piping and at least two points of use, The vacuum insulation pipeline includes a vacuum shell, a main pipeline, at least one branch pipeline arranged downward from the tee of the main pipeline, and at least one liquid outlet inner pipe arranged toward the corresponding end use point. A vacuum liquid barrier as claimed in any one of claims 1 to 2 is arranged at the junction of the branch pipeline inside the vacuum shell and the liquid outlet inner pipe.

4. The cryogenic multi-user system according to claim 3, characterized in that: The branch pipeline of the vacuum insulation pipeline is inserted into the lower end of the cavity of the barrier shell through the first opening to form a liquid inlet inner tube, and the liquid outlet inner tube is arranged at the upper end of the cavity and extends toward the end use point through the second opening.

5. The cryogenic multi-user system according to claim 4, characterized in that: The main pipeline, branch pipeline and part of the upper end liquid outlet inner pipe are all arranged in the vacuum shell to form a vacuum section, the bottom end of the liquid outlet inner pipe extends out of the vacuum shell to form a non-vacuum section, and the vacuum liquid barrier is located in the vacuum section.

6. The cryogenic multi-user system according to claim 4, characterized in that: At least two user points are arranged at each use point.

7. The cryogenic multi-user system according to claim 6, characterized in that: The cryogenic liquid in the storage tank is transported to the corresponding user point through the main pipeline and branch pipeline. When the cryogenic liquid flows to the user point at the rear end, the cryogenic liquid or cold gas flowing through the front branch pipeline will be blocked in the vacuum liquid barrier.

Images