阅读说明：本技术 液氢储罐的排放管上的液氢取样机构 (Liquid hydrogen sampling mechanism on discharge pipe of liquid hydrogen storage tank ) 是由 刘庆洋 陈甲楠 任改红 邱芳 唐健 韩杰 倪中华 严岩 李仕豪 于 2020-06-08 设计创作，主要内容包括：本发明公开了一种液氢储罐的排放管上的液氢取样机构,包括：排放管的内管上开设有取样口,取样口处的内管外壁上设置有内管连接座,排放管的外管上开设有连接通孔,外管上设置有绝缘筒体,绝缘筒体内部为绝缘腔室,绝缘筒体外连接有加热套筒,绝缘座从绝缘腔室延伸至加热套筒内,绝缘座上开设有安装通孔,绝缘座与取样管连接,取样管的管口与安装通孔之间密封隔断,取样管伸出加热套筒,加热套筒上设置有介质输入管和介质输出管；取样口与安装通孔之间设置有毛细管,毛细管的两端分别伸入排放管和取样管内。本发明的优点在于：实现了就近检测,检测周期大大缩短,能有效避免取样过程中外界热量对液氢储罐罐体内的液氢产生影响。(The invention discloses a liquid hydrogen sampling mechanism on a discharge pipe of a liquid hydrogen storage tank, which comprises: the device comprises a discharge pipe, an insulation cylinder, a heating sleeve, an insulation seat, a medium input pipe, a medium output pipe, a sampling pipe, an insulation cavity, a heating sleeve, a medium input pipe, a medium output pipe, a heating sleeve and a heating cavity, wherein the inner pipe of the discharge pipe is provided with a sampling port, the outer wall of the inner pipe at the sampling port is provided with an inner pipe connecting seat, the outer pipe of the discharge pipe is provided with a connecting through hole, the insulation cylinder is internally provided with an insulation cavity, the insulation cylinder is externally connected with the heating sleeve, the; a capillary tube is arranged between the sampling port and the mounting through hole, and two ends of the capillary tube respectively extend into the discharge pipe and the sampling pipe. The invention has the advantages that: the method has the advantages of realizing the nearby detection, greatly shortening the detection period and effectively avoiding the influence of external heat on the liquid hydrogen in the liquid hydrogen storage tank body in the sampling process.)

1. Liquid hydrogen sampling mechanism on the delivery pipe of liquid hydrogen storage tank, the delivery pipe include inner tube and outer tube, form cavity, its characterized in that between inner tube and the outer tube: the sampling device comprises an inner pipe, an insulating cylinder, a sampling tube, a heating sleeve, a sampling tube, a medium input tube, a medium output tube, an insulating cylinder, a heating sleeve, a sampling tube, a medium output tube and a medium output tube, wherein the inner pipe is provided with the sampling port, the outer wall of the inner pipe at the sampling port is provided with the inner pipe connecting seat protruding towards the direction of the outer pipe, the outer wall of the outer pipe is provided with a connecting through hole, the insulating cylinder is fixedly arranged on the outer wall of the outer pipe in a sealing manner, an insulating cavity is formed in the insulating cylinder, the insulating cylinder is connected with the vacuum connecting tube for evacuating the insulating cavity, the insulating cylinder is fixedly connected with the heating sleeve in a sealing manner, the insulating seat extends into the heating sleeve from the insulating cavity, the insulating seat is fixed with the; the sampling device comprises a sampling port, a sampling pipe, an inner pipe connecting seat, a connecting through hole, a capillary pipe, an insulating pipe, a connecting through hole, a sealing insulating filler and a mounting through hole.

2. The liquid hydrogen sampling mechanism on the discharge pipe of the liquid hydrogen storage tank according to claim 1, characterized in that: the connection structure between insulating cylinder and the outer tube includes: the outer tube connecting seat is arranged on the outer wall of the outer tube, the first sealing ring is arranged on the outer tube connecting seat, the insulating cylinder body and the outer tube connecting seat are fixed in a thread sealing mode, and the top of the insulating cylinder body is pressed and blocked on the first sealing ring.

3. The liquid hydrogen sampling mechanism on the discharge pipe of the liquid hydrogen storage tank according to claim 2, characterized in that: the inner wall of the heating sleeve is provided with a first sealing inclined plane, the inner wall of the heating sleeve above the first sealing inclined plane is provided with an internal thread, the outer wall of the insulating cylinder body is provided with a second sealing inclined plane matched with the first sealing inclined plane, the outer wall of the insulating cylinder body above the second sealing inclined plane is provided with an external thread, the heating sleeve and the insulating cylinder body are in threaded sealing connection, and the first sealing inclined plane on the inner wall of the heating sleeve is sealed and blocked on the second sealing inclined plane on the outer wall of the insulating cylinder body.

4. The liquid hydrogen sampling mechanism on the discharge pipe of the liquid hydrogen storage tank according to claim 1, 2 or 3, characterized in that: the connection structure between insulating seat and the sampling tube includes: the upper port of the sampling tube comprises an inner port and an outer port which are arranged inside and outside, a connecting groove is formed between the inner port and the outer port, a second sealing ring is arranged in the connecting groove, and a supporting part is arranged on the top end surface of the inner port; the bottom of the installation through hole of the insulating seat is provided with a third sealing ring, the third sealing ring is sleeved outside the capillary, the lower end of the insulating seat extends into the connecting groove and presses and blocks on the second sealing ring, the insulating seat and the connecting groove are fixed in a thread sealing manner, and the supporting part of the port in the sampling tube supports and presses and blocks the bottom of the third sealing ring.

5. The liquid hydrogen sampling mechanism on the discharge pipe of the liquid hydrogen storage tank of claim 4, wherein: and a sealing insulating filler is arranged in the inner pipe connecting seat outside the capillary, and the insulating pipe is sealed and pressed on the sealing insulating filler.

6. The liquid hydrogen sampling mechanism on the discharge pipe of the liquid hydrogen storage tank of claim 5, wherein: the sealing insulating filler is made of polychlorotrifluoroethylene.

Technical Field

The invention relates to the technical field of liquid hydrogen storage tanks, in particular to a liquid hydrogen sampling mechanism on a liquid hydrogen storage tank.

Background

The liquid hydrogen has the characteristics of high density, high safety performance, small pressure and the like. Currently, although the total demand for hydrogen in China is relatively small, the demand for ultra-pure hydrogen is short-supply. The domestic outbreak period of hydrogen energy use and the rapid growth period of hydrogen-related equipment are already in step. The proliferation of hydrogen energy vehicles, hydrogen stations, and the electronic semiconductor industry has further led to the expansion of the demand gap for ultra-pure hydrogen.

To ensure that ultra-pure hydrogen is provided that meets the purity requirements, the ultra-pure hydrogen in the liquid hydrogen storage tank needs to be sampled. Convenient, safe and reliable sampling is an effective guarantee for obtaining an accurate detection result. The traditional detection mode is as follows: liquid hydrogen or low-temperature gas hydrogen is collected on a discharge pipe and then sent to a laboratory for detection. The detection period required by the sampling detection mode is long, the amount of the extracted liquid hydrogen is relatively large, and the sample is easy to pollute in the transportation and storage processes. In addition, the liquid hydrogen is collected by the discharge pipe, so that external heat is easily brought into the liquid hydrogen storage tank, and the liquid hydrogen storage is influenced. The traditional detection mode cannot meet the increasing use requirement of the ultra-pure hydrogen.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the utility model provides a liquid hydrogen sampling mechanism on the delivery pipe of liquid hydrogen storage tank, can realize detecting nearby through this sampling mechanism to the influence to liquid hydrogen storage tank is inside little.

In order to solve the problems, the invention adopts the technical scheme that: a liquid hydrogen sampling mechanism on a discharge pipe of a liquid hydrogen storage tank, wherein the discharge pipe comprises an inner pipe and an outer pipe, a cavity is formed between the inner pipe and the outer pipe, a sampling opening is formed in the inner pipe, an inner pipe connecting seat protruding towards the outer pipe is arranged on the outer wall of the inner pipe at the sampling opening, a connecting through hole is formed in the outer pipe, an insulating cylinder is fixedly arranged on the outer wall of the outer pipe in a sealing manner, an insulating cavity is formed in the insulating cylinder, a vacuum connecting pipe used for evacuating the insulating cavity is connected to the insulating cylinder, a heating sleeve is fixedly connected to the outside of the insulating cylinder in a sealing manner, the insulating seat extends into the heating sleeve from the insulating cavity, the insulating seat is fixed with the insulating cylinder, a mounting through hole is formed in the insulating seat in an axial penetrating manner, a sampling pipe is fixedly connected to the bottom of the insulating seat, the heating sleeve is provided with a medium input pipe and a medium output pipe; the capillary tube is arranged between the sampling port and the mounting through hole, two ends of the capillary tube respectively extend into the discharge tube and the sampling tube, an insulating tube with an internal vacuum is fixedly and hermetically arranged outside the capillary tube, one end of the insulating tube is fixed with the inner tube connecting seat in a thread sealing manner, a sealing insulating filler is arranged between the insulating tube and the connecting through hole, the other end of the insulating tube extends into the upper end part in the mounting through hole, and a sealing insulating filler is arranged in the mounting through hole outside the capillary tube.

Further, the aforesaid liquid hydrogen sampling mechanism on the discharge pipe of liquid hydrogen storage tank, wherein, the connection structure between insulating barrel and the outer tube includes: the outer tube connecting seat is arranged on the outer wall of the outer tube, the first sealing ring is arranged on the outer tube connecting seat, the insulating cylinder body and the outer tube connecting seat are fixed in a thread sealing mode, and the top of the insulating cylinder body is pressed and blocked on the first sealing ring.

Further, liquid hydrogen sampling mechanism on the delivery pipe of aforementioned liquid hydrogen storage tank, wherein, be provided with first sealed inclined plane on the heating sleeve's the inner wall, be provided with the internal thread on the heating sleeve's of first sealed inclined plane top inner wall, be provided with the sealed inclined plane of second with first sealed inclined plane matched with on the outer wall of insulating barrel, be provided with the external screw thread on the outer wall of the insulating barrel of the sealed inclined plane top of second, thread sealing connects between heating sleeve and the insulating barrel, and the sealed card of the first sealed inclined plane on the heating sleeve inner wall keeps off on the sealed inclined plane of second on the insulating barrel outer wall.

Further, the aforesaid liquid hydrogen sampling mechanism on the discharge pipe of liquid hydrogen storage tank, wherein, the connection structure between insulator seat and the sampling tube includes: the upper port of the sampling tube comprises an inner port and an outer port which are arranged inside and outside, a connecting groove is formed between the inner port and the outer port, a second sealing ring is arranged in the connecting groove, and a supporting part is arranged on the top end surface of the inner port; the bottom of the installation through hole of the insulating seat is provided with a third sealing ring, the third sealing ring is sleeved outside the capillary, the lower end of the insulating seat extends into the connecting groove and presses and blocks on the second sealing ring, the insulating seat and the connecting groove are fixed in a thread sealing manner, and the supporting part of the port in the sampling tube supports and presses and blocks the bottom of the third sealing ring.

Further, according to the liquid hydrogen sampling mechanism on the discharge pipe of the liquid hydrogen storage tank, the inner pipe connecting seat outside the capillary is internally provided with the sealing insulating filler, and the insulating pipe is sealed and pressed on the sealing insulating filler.

Further, in the liquid hydrogen sampling mechanism on the discharge pipe of the liquid hydrogen storage tank, the sealing insulating filler is made of polychlorotrifluoroethylene.

The invention has the advantages that: the method has the advantages of realizing the near detection, greatly shortening the detection period, ensuring that the sampled product is not polluted, and effectively avoiding the influence of external heat on the liquid hydrogen in the liquid hydrogen storage tank body in the sampling process. And secondly, the sampling flow of the capillary tube is stable, and the influence on the detection result caused by overlarge flow or unstable flow can be effectively avoided. And thirdly, the heating medium heats the low-temperature hydrogen, so that the influence on the detection result of the instrument or the damage to the detection instrument caused by too low temperature is effectively avoided. And fourthly, the whole sampling mechanism adopts a detachable connection structure, so that the installation and the maintenance are greatly facilitated.

Drawings

Fig. 1 is a schematic structural diagram of a liquid hydrogen sampling mechanism on a discharge pipe of a liquid hydrogen storage tank according to the present invention.

Fig. 2 is an enlarged schematic view of a portion a of fig. 1.

Detailed Description

The invention is described in further detail below with reference to the figures and preferred embodiments.

As shown in fig. 1 and 2, the liquid hydrogen sampling mechanism on the discharge pipe of the liquid hydrogen storage tank, the discharge pipe 1 comprises an inner pipe 11 and an outer pipe 12, and a cavity is formed between the inner pipe 11 and the outer pipe 12. A sampling opening 2 is formed in the inner pipe 11, an inner pipe connecting seat 3 protruding towards the direction of the outer pipe 12 is arranged on the outer wall of the inner pipe 11 at the sampling opening 2, and a connecting through hole 121 is formed in the outer pipe 12. The outer wall of the outer tube 12 is fixedly provided with an insulating cylinder 4 in a sealing manner, an insulating cavity 41 is formed inside the insulating cylinder 4, and the insulating cylinder 4 is connected with a vacuum connecting tube 42 for evacuating the insulating cavity 41. When the vacuum is pumped, the vacuum connection tube 42 is connected to a negative pressure device, so that the inside of the insulation chamber 41 can be pumped.

The outer sealing fixedly connected with heating sleeve 5 of insulating barrel 4, insulating seat 6 extends to heating sleeve 5 in from insulating cavity 41, and insulating seat 6 is fixed mutually with insulating barrel 4. The insulating seat 6 axially runs through and is provided with an installation through hole 61, the bottom of the insulating seat 6 is fixedly connected with a sampling tube 7, and a pipe opening at the upper end of the sampling tube 7 is hermetically separated from the installation through hole 61. The sampling tube 7 is fixed with the heating sleeve 5 in a sealing way and extends out of the heating sleeve 5, and a medium input tube 51 and a medium output tube 52 are arranged on the heating sleeve 5. The heating medium for heating the liquid hydrogen enters the heating jacket 5 from the medium inlet pipe 51, and the heating medium having absorbed heat is discharged from the medium outlet pipe 52. Be provided with capillary 8 between sample connection 2 and the installation through-hole 61, in the both ends of capillary 8 stretched into delivery pipe 1 and sampling tube 7 respectively, the outer fixed seal of capillary 8 was provided with inside vacuum insulating tube 81, the one end and the 3 thread seal of inner tube connecting seat of insulating tube 81 are fixed, be provided with sealed insulating filler in the outer connect through-hole 121 of insulating tube 81, the other end of insulating tube 81 stretches into the upper end to the installation through-hole 61 in, also be provided with sealed insulating filler 9 in the outer installation through-hole 61 of capillary 8. And a sealing insulating filler is arranged in the inner pipe connecting seat 3 outside the capillary tube 8, and the insulating pipe 81 is sealed and pressed on the sealing insulating filler. In order to improve the sealing effect, all the sealing insulating fillers are made of polychlorotrifluoroethylene materials.

Specifically, the connection structure between the insulating cylinder 4 and the outer tube 12 in this embodiment includes: an outer tube connecting seat 122 is arranged on the outer wall of the outer tube 12, a first sealing ring 101 is arranged outside the outer tube connecting seat 122, the insulating cylinder 4 and the outer tube connecting seat 122 are fixed in a thread sealing mode, and the top of the insulating cylinder 4 is pressed and blocked on the first sealing ring 101. And due to the double sealing structure of the thread and the sealing ring, the reliability of sealing connection between the insulating cylinder 4 and the outer pipe connecting seat 122 is greatly improved.

Specifically, the sealing and fixing structure between the heating sleeve 5 and the insulating cylinder 4 in this embodiment includes: be provided with first sealed inclined plane 51 on the inner wall of heating sleeve 5, be provided with the internal thread on the inner wall of heating sleeve 5 above first sealed inclined plane 51, be provided with the sealed inclined plane 42 of second with first sealed inclined plane 51 matched with on the outer wall of insulating barrel 4, be provided with the external screw thread on the outer wall of insulating barrel 4 above the sealed inclined plane 42 of second, screw thread sealing connection between heating sleeve 5 and the insulating barrel 4, the sealed card of first sealed inclined plane 51 on the heating sleeve 5 inner wall blocks on the sealed inclined plane 42 of second on the outer wall of insulating barrel 4. Double sealing effectively ensures the sealing effect between the heating sleeve 5 and the insulating cylinder 4.

Specifically, the connection structure between the insulating base 6 and the sampling tube 7 in this embodiment includes: the upper port of the sampling tube 7 comprises an inner port 71 and an outer port 72 which are arranged inside and outside, a connecting groove 701 is formed between the inner port 71 and the outer port 72, a second sealing ring 102 is arranged in the connecting groove 701, and a supporting part 711 is arranged on the top end surface of the inner port 71; the bottom of the installation through hole 61 of the insulating base 6 is provided with a third sealing ring 103, the third sealing ring 103 is sleeved outside the capillary tube 8, the lower end of the insulating base 6 extends into the connecting groove 701 and presses and blocks on the second sealing ring 102, the insulating base 6 and the connecting groove 701 are fixed in a thread sealing manner, and a supporting part 711 of an inner port 71 of the sampling tube 7 supports and presses and blocks at the bottom of the third sealing ring 103.

The working principle is as follows: vacuum is maintained in the insulating chamber 41 and the heating medium enters the heating jacket 5 from the medium inlet pipe 51. Generally, heated nitrogen gas can be used as the heating medium. When liquid hydrogen detection is required, liquid hydrogen in the liquid hydrogen storage tank enters the discharge pipe 1 and then enters the capillary 8. The liquid hydrogen in the capillary 8 is vaporized into low temperature hydrogen gas which enters the sampling tube 7. Because the vacuum insulating tube 81 is arranged outside the capillary tube 8, and the insulating cavity 41 is arranged outside the insulating tube 81, the double-layer insulation can play a good heat insulation role, and the influence of external heat on the inside of the liquid hydrogen storage tank is effectively prevented. The insulating base 6 and the sealing insulating filler 9 in the installation through hole 61 of the insulating base 6 further play a role in heat insulation, and further reduce the influence of external heat on the inside of the liquid hydrogen storage tank. In addition, the insulation chamber 41 and the insulation seat 6 prolong the sampling path, and the influence of the external temperature on the inside of the liquid hydrogen storage tank is effectively reduced. The heating medium in the heating sleeve 5 heats the low-temperature hydrogen entering the sampling tube 7, and the heat-exchanged heating medium is output from the medium output tube 52. The heated hydrogen is conveyed from the sampling pipe 7 to a detection instrument for detection. The capillary tube 8 effectively ensures that the hydrogen flow is stable during sampling, thereby effectively avoiding influencing the detection result due to overlarge flow or unstable flow. In addition, the heating medium heats the low-temperature hydrogen, so that the influence on the detection result of the instrument or the damage to the detection instrument caused by too low temperature is effectively avoided.

In addition, because between insulating tube 81 and the inner tube connecting seat 3, between the outer tube connecting seat 122 of the insulating cylinder 4, between heating sleeve 5 and the insulating cylinder 4, all adopt the threaded fixation between insulating seat 6 and the sampling tube 7, the connection structure can be dismantled in whole sampling mechanism adoption promptly, this installation and the maintenance that has made things convenient for the sampling test mechanism greatly.