阅读说明：本技术 循环回路及包括该循环回路的低温液体运输/充装装置 (Circulation loop and low-temperature liquid transporting/filling device comprising same ) 是由 曾晖 毛海涛 郑尚和 姜星 谢少卿 于 2020-06-22 设计创作，主要内容包括：本发明公开了循环回路及包括该循环回路的低温液体运输/充装装置,涉及低温液体运输/充装技术领域,该循环回路,用于安装在低温液体运输/充装装置上,低温液体运输/充装装置包括低温液体储罐以及与低温液体储罐连接的输送泵；循环回路包括单向阀、回流管以及用于使回流管内的低温液态汽化的汽化装置,回流管与单向阀出口端连接,单向阀的进口端与输送泵的出口端连接,回流管或汽化装置的出口端与低温液体储罐连接。本发明的有益效果是不仅能够使低温液体储罐内部的压力保持稳定,而且还能够实现对低温液体储罐进行增压的作用,从而能够避免输送泵发生汽蚀而停止工作。本发明中的循环回路结构简单,生产成本低,使用方便。(The invention discloses a circulation loop and a low-temperature liquid transporting/filling device comprising the same, and relates to the technical field of low-temperature liquid transporting/filling, wherein the circulation loop is used for being arranged on the low-temperature liquid transporting/filling device, and the low-temperature liquid transporting/filling device comprises a low-temperature liquid storage tank and a delivery pump connected with the low-temperature liquid storage tank; the circulating loop comprises a one-way valve, a return pipe and a vaporizing device for vaporizing the low-temperature liquid in the return pipe, the return pipe is connected with the outlet end of the one-way valve, the inlet end of the one-way valve is connected with the outlet end of the delivery pump, and the outlet end of the return pipe or the vaporizing device is connected with the low-temperature liquid storage tank. The invention has the advantages that the pressure in the low-temperature liquid storage tank can be kept stable, and the function of pressurizing the low-temperature liquid storage tank can be realized, so that the stop of the work of the delivery pump due to cavitation can be avoided. The circulation loop in the invention has simple structure, low production cost and convenient use.)

1. A recirculation loop characterized by: for mounting on a cryogenic liquid transport/filling apparatus comprising a cryogenic liquid storage tank (21) and a transfer pump (22); the circulation loop comprises a one-way valve (11), a return pipe (12) and a vaporizing device used for vaporizing low-temperature liquid in the return pipe (12), the return pipe (12) is connected with the outlet end of the one-way valve (11), the inlet end of the one-way valve (11) is connected with the outlet end of the delivery pump (22), and the outlet end of the return pipe (12) or the vaporizing device is connected with the low-temperature liquid storage tank (21).

2. The recirculation loop of claim 1, wherein: the vaporizing device is a throttle device for throttling, which is arranged in the return pipe (12) in the radial direction.

3. The recirculation loop of claim 2, wherein: the throttling device is a throttling orifice plate (13), and a through throttling hole (14) is formed in the throttling orifice plate (13).

4. The recirculation loop of claim 3, wherein: the throttle orifice (14) is located in the center of the throttle orifice (13).

5. The recirculation loop of claim 3, wherein: the diameter of the throttle hole (14) is 2.5-4.5 mm.

6. The recirculation loop of claim 1, wherein: the outlet end of the return pipe (12) is connected with the top of the low-temperature liquid storage tank (21).

7. A cryogenic liquid transport/filling apparatus, characterized by: comprising a circulation loop according to any one of claims 1 to 6.

8. A cryogenic liquid transport/filling apparatus according to claim 7, wherein: the system comprises a low-temperature liquid storage tank (21), a pump pool (23), a delivery pump (22) and a filling pipeline (24) which are connected in sequence, wherein the delivery pump (22) is arranged in the pump pool (23), and the filling pipeline (24) is provided with a low-temperature liquid outlet (25); the inlet end of the circulation loop is connected with the outlet end of the delivery pump (22), and the outlet end of the circulation loop is connected with the low-temperature liquid storage tank (21).

9. A cryogenic liquid transport/filling apparatus according to claim 7, wherein: and the difference value between the air pressure in the low-temperature liquid storage tank after the circulation loop returns and the initial air pressure is greater than or equal to 68.95 kPa.

10. A cryogenic liquid transport/filling apparatus according to claim 7, wherein: the flow of the low-temperature liquid outlet (25) is less than 7.8m³/h。

Technical Field

The invention relates to the technical field of low-temperature liquid transportation/filling, in particular to a circulation loop and a low-temperature liquid transportation/filling device comprising the circulation loop.

Background

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art and to providing a circulation loop and a cryogenic liquid transport/filling apparatus comprising the same.

The technical solution of the invention is as follows:

a circulation loop for mounting on a cryogenic liquid transport/filling apparatus, the cryogenic liquid transport/filling apparatus comprising a cryogenic liquid storage tank and a transfer pump; the circulating loop comprises a one-way valve, a return pipe and a vaporizing device used for vaporizing low-temperature liquid in the return pipe, the return pipe is connected with the outlet end of the one-way valve, the inlet end of the one-way valve is connected with the outlet end of the delivery pump, and the outlet end of the return pipe or the vaporizing device is connected with the low-temperature liquid storage tank.

Preferably, the vaporizing device is a throttling device for throttling, and the throttling device is arranged in the return pipe along the radial direction.

Preferably, the throttling device is an orifice plate, and the orifice plate is provided with a through throttling hole.

Preferably, the orifice is located in the center of the orifice plate.

Preferably, the diameter of the throttling hole is 2.5-4.5 mm.

Preferably, the outlet end of the return pipe is connected to the top of the cryogenic liquid storage tank.

A low-temperature liquid transporting/filling device comprises the circulating loop.

Preferably, the system comprises a cryogenic liquid storage tank, a pump pool, a delivery pump and a filling pipeline which are connected in sequence, wherein the delivery pump is arranged in the pump pool, and the filling pipeline is provided with a cryogenic liquid outlet; and the inlet end of the circulating loop is connected with the outlet end of the delivery pump, and the outlet end of the circulating loop is connected with the low-temperature liquid storage tank.

Preferably, the difference between the air pressure in the low-temperature liquid storage tank after being refluxed through the circulation loop and the initial air pressure is greater than or equal to 68.95 kPa.

Preferably, the flow rate of the low-temperature liquid outlet is less than 7.8m³/h。

The invention has the beneficial effects that: according to the invention, the circulation loop structure is added on the low-temperature liquid transportation/filling device, so that part of the low-temperature liquid from the delivery pump can return to the circulation loop, part of the low-temperature liquid in the circulation loop is vaporized in the flowing process through the throttling action of the throttling orifice plate in the circulation loop structure, and the low-temperature liquid and the vaporized low-temperature liquid are mixed and return to the inner top of the low-temperature liquid storage tank, so that the pressure in the low-temperature liquid storage tank can be kept stable, the effect of pressurizing the low-temperature liquid storage tank can be realized, and the delivery pump can be prevented from cavitation and stopping working. The circulation loop in the invention has simple structure, low production cost and convenient use.

Drawings

FIG. 1 is a schematic diagram of the structure of a circulation loop in a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view of a portion of a cryogenic liquid transport unit in a preferred embodiment of the invention;

the following are marked in the figure: 11. a one-way valve; 12. a return pipe; 13. a restriction orifice plate; 14; an orifice; 21. a cryogenic liquid storage tank; 22. a delivery pump; 23. a pump pool; 24. filling a pipeline; 25. a cryogenic liquid outlet; 26. a pump outlet valve; 27. an outer cylinder; 28. an interlayer; 29. and (4) an air return pipe.

Detailed Description

The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

As shown in fig. 1-2, the circulation circuit in this embodiment includes a check valve 11, a return pipe 12, and a vaporizing device for vaporizing the low-temperature liquid in the return pipe 12, an inlet end of the return pipe 12 is connected to an outlet end of the check valve 11, in this embodiment, the vaporizing device is a throttling device, the throttling device may be a throttle plate with a slit or an orifice, specifically, in this embodiment, the throttling device is a throttle plate 13, the throttle plate 13 is embedded in the return pipe 12 in a radial direction, the throttle plate 13 has a through throttle hole 14, and the throttle hole 13 throttles the return pipe 12. In practical applications, the vaporizing device may be a vaporizer, which may be determined by those skilled in the art. The throttle hole 14 is located at the center of the throttle orifice 13 so as to facilitate the passage of cryogenic liquid through the throttle hole 14, and in practical applications, the throttle hole 14 may not be located at the center of the throttle orifice 13, which may be determined by those skilled in the art according to practical situations. In this embodiment, the diameter of the orifice 14 is 3.5mm, so that the cryogenic liquid can pass through the orifice 14 at a suitable speed, and in practical application, the diameter of the orifice 14 may also be 2.5mm, 3mm, 4mm or 4.5mm, which may be determined by those skilled in the art according to practical situations.

Fig. 3 is a partial schematic structural view of the cryogenic liquid transportation device in the present embodiment, in which the above-mentioned circulation loop is used to be installed on the cryogenic liquid transportation device, such as a cryogenic liquid transportation vehicle; in practice, the circulation circuit can also be used for mounting on a cryogenic liquid filling apparatus, i.e. for filling the cryogenic liquid in the tank to other storage equipment, as the person skilled in the art will recognize. The cryogenic liquid transportation device comprises a cryogenic liquid storage tank 21, a pump pool 23, a delivery pump 22, a filling pipeline 24 and a circulation loop, wherein the cryogenic liquid storage tank 21 is used for storing cryogenic liquid, such as liquid nitrogen. Still overlap on the outer wall of cryogenic liquids storage tank 21 and be equipped with outer barrel 27, set up intermediate layer 28 between outer barrel 27 and cryogenic liquids storage tank 21 to keep warm cryogenic liquids storage tank 21 through outer barrel 27 and intermediate layer 28. The pump pool 23 is connected with the bottom of the cryogenic liquid storage tank 21 through a pipeline, so that the cryogenic liquid storage tank 21 can be sucked into the pump pool 23, the upper end of the pump pool 23 is also connected with the top of the cryogenic liquid storage tank 21 through a gas return pipe 29, and the vaporized cryogenic liquid in the pump pool 23 returns to the cryogenic liquid storage tank 21 through the gas return pipe 29. The transfer pump 22 is disposed at the bottom of the pump sump 23 and is in contact with the cryogenic liquid in the pump sump 23. The outlet end of the delivery pump 22 is connected with a filling pipeline 24 and a circulation loop through a liquid outlet pipe, and a pump outlet valve 26 for controlling the on-off of the liquid outlet pipe is also arranged on the liquid outlet pipe; the filling pipeline 24 is provided with a low-temperature liquid outlet 25, the low-temperature liquid in the pump pool 23 is pressurized through the delivery pump 22, the pressurized low-temperature liquid is delivered into the filling pipeline 24, and other transportation or storage equipment can be filled with the low-temperature liquid through the low-temperature liquid outlet 25; the inlet end of the circulation loop is connected with the liquid outlet pipe, the outlet end of the circulation loop is connected with the low-temperature liquid storage tank 21, specifically, the inlet end of the one-way valve 11 is connected with the outlet end of the liquid outlet pipe through a pipeline, and the return loopThe outlet end of the flow pipe 12 is connected to the top of the cryogenic liquid storage tank 21 for returning part of the cryogenic liquid in the liquid outlet pipe to the cryogenic liquid storage tank 21. In this embodiment, the difference between the pressure in the low-temperature liquid storage tank 21 after the reflux in the circulation loop and the initial pressure in the low-temperature liquid storage tank 21 is greater than or equal to 68.95kPa, that is, after the reflux in the circulation loop, the pressure in the low-temperature liquid storage tank 21 is at least 68.95kPa greater than the initial pressure, and the initial low-temperature liquid in the low-temperature liquid storage tank 21 is partially vaporized, so that the low-temperature liquid in the liquid phase and the low-temperature liquid in the gas phase exist in the low-temperature liquid storage tank 21 at the same time, at this time, the low-temperature liquid in the liquid phase belongs to a saturated liquid, and the initial pressure in the; when the partially vaporized cryogenic liquid is returned through the circulation circuit, the pressure of the cryogenic liquid storage tank 21 is the sum of the pressure of the initial cryogenic liquid and the pressure of the returned vaporized cryogenic liquid, thereby preventing the feed pump 22 from cavitation during the filling of the cryogenic liquid. In this embodiment, the flow rate of the low-temperature liquid outlet 25 is less than 7.8m³And/h, the circulation circuit can return part of the low-temperature liquid in the liquid outlet pipe to the low-temperature liquid storage tank 21, so that the pressure in the low-temperature liquid storage tank 21 can be kept stable, the low-temperature liquid storage tank 21 can be pressurized, and the cavitation of the delivery pump 22 can be avoided.

This embodiment is through increasing the circulation circuit structure on cryogenic liquids conveyer for in the part cryogenic liquids that come out from delivery pump 22 can get back to the circulation circuit, throttle effect through orifice plate 13 in the circulation circuit structure, make part cryogenic liquids in the circulation circuit vaporize at the flow in-process, cryogenic liquids and the cryogenic liquids after the vaporization mix back to the interior top of cryogenic liquids storage tank 21, not only can make the inside pressure of cryogenic liquids storage tank 21 remain stable, but also can realize carrying out the effect of pressure boost to cryogenic liquids storage tank 21, thereby can avoid delivery pump 22 to take place the cavitation.

The above are merely characteristic embodiments of the present invention, and do not limit the scope of the present invention in any way. All technical solutions formed by equivalent exchanges or equivalent substitutions fall within the protection scope of the present invention.