Low-temperature liquid storage tank with pump

Abstract

The utility model discloses a low-temperature liquid storage tank with a pump, and belongs to the technical field of low-temperature liquid storage tanks. The storage tank comprises a tank body, the tank body comprises an outer shell and an inner container arranged in the outer shell, and a first vacuum interlayer is formed between the outer shell and the inner container; a joint is arranged at one end of the tank body, a pump pool is detachably installed at the bottom of the outer shell, and the pump pool is arranged outside the outer shell and located inside the joint; a pump pool flange cover is arranged on the outer side of the bottom of the outer shell, and a pump pool flange assembled on the pump pool flange cover is arranged at the upper end of the pump pool. The pump pool comprises a pump pool inner container and a pump pool shell, a second vacuum interlayer is formed between the pump pool shell and the pump pool inner container, a pump pool cold insulation insulator is arranged on the outer wall of the pump pool inner container, a low-temperature pump is arranged in the pump pool inner container and completely located in the pump pool inner container, and a pump connecting flange is arranged at the liquid outlet end of the low-temperature pump. And the pump connecting flange is assembled on the pump pool flange cover. The low-temperature pump has the advantage that the liquid circulation efficiency between the storage tank and the low-temperature pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cryogenic liquid storage tanks, in particular to a cryogenic liquid storage tank with a pump. Background Art

[0002] The storage and use of cryogenic liquefied gases require special equipment and components, such as liquefied natural gas (LNG), liquid oxygen, liquid nitrogen, liquid argon and other cryogenic liquefied gases. It is necessary to consider both the material and sealing performance to meet the usual low temperature requirements of -196°C, and to ensure stability during operation.

[0003] Due to the stringent cold preservation requirements of cryogenic liquids, double-layer vacuum tanks are usually used for small storage tanks to control their evaporation rate, that is, the inner container stores the liquid, the outer shell and the inner container are evacuated, and filled with expanded perlite, or wrapped with aluminum foil and fiberglass composite materials. The liquid in the tank is effectively transported using a cryogenic submersible pump.

[0004] The conventional solution is to set up a small cryogenic container and cryogenic pump in the external space not far from the storage tank. The cryogenic pump must be used at low temperature, and the pump pool and the long pipeline need to be cooled before starting. Since the pipeline between the tank and the pump pool is long, the pressure of the pump inlet pipe is increased, which reduces the liquid circulation efficiency. This solution takes a long time to precool, the liquid is prone to poor circulation, and the cryogenic pump is prone to cavitation. Utility Model Content

[0005] The utility model aims to provide a low-temperature liquid storage tank with a pump, which can improve the liquid circulation efficiency between the storage tank and the low-temperature pump.

[0006] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions for the low-temperature liquid storage tank with pump:

[0007] A low-temperature liquid storage tank with a pump comprises a tank body, the tank body comprises an outer shell and an inner container arranged inside the outer shell, a first vacuum interlayer is formed between the outer shell and the inner container; a connection place is provided at one end of the tank body, a pump pool is detachably installed on the bottom of the outer shell, the pump pool is arranged on the outside of the outer shell and located inside the connection place; a pump pool flange cover is provided on the outer side of the bottom of the outer shell, and a pump pool flange assembled on the pump pool flange cover is provided on the upper end of the pump pool; the pump pool comprises a pump pool liner and a pump pool shell, a second vacuum interlayer is formed between the pump pool shell and the pump pool liner, the outer wall of the pump pool liner is provided with a pump pool cold insulation, a low-temperature pump is arranged inside the pump pool liner, the low-temperature pump is completely located inside the pump pool liner, a pump connecting flange is provided at the liquid outlet end of the low-temperature pump, and the pump connecting flange is assembled on the pump pool flange cover; the pump pool liner is provided with a pump pool liquid inlet pipe, The pump pool liquid inlet pipe passes through the pump pool shell, and the inner container is provided with a storage tank liquid outlet pipe, which passes through the outer shell and is connected with the pump pool liquid inlet pipe, and the part of the storage tank liquid outlet pipe passing through the outer shell is provided with a first purge discharge pipe, and the first purge discharge pipe is provided with a first purge discharge valve; the liquid outlet end of the low-temperature pump is provided with a pump liquid outlet pipe, which passes through the pump pool flange cover and passes through the outer shell after passing through the first vacuum interlayer, and the part of the pump liquid outlet pipe passing through the outer shell is provided with a second purge discharge pipe, and the second purge discharge pipe is provided with a second purge discharge valve; the pump pool flange cover is provided with a pump return air pipe, one end of the pump return air pipe is connected to the inside of the pump pool liner, and the other end of the pump return air pipe is connected to the inner container, one section of the pump return air pipe passes through the first vacuum interlayer and passes through the outer shell, and the part of the pump return air pipe passing through the outer shell is provided with a third purge discharge pipe, and the third purge discharge pipe is provided with a third purge discharge valve.

[0008] Preferably, a vent pipe is provided in the connection place, the vent pipe is connected to the first purge discharge pipe, the second purge discharge pipe and the third purge discharge pipe respectively, the vent pipe is provided with a ventilation mast passing through the connection place, and a ventilation cap is provided at the end of the ventilation mast.

[0009] Preferably, the first purge exhaust pipe, the second purge exhaust pipe and the third purge exhaust pipe are all located inside the connection location.

[0010] Preferably, the portion of the storage tank liquid outlet pipe passing through the outer shell and the portion of the pump pool liquid inlet pipe passing through the pump pool outer shell are both provided with a first cold-keeping insulation.

[0011] Preferably, the portion of the pump outlet pipe passing through the outer shell is provided with a second cold-keeping insulation.

[0012] Preferably, the cryogenic pump is a cryogenic submersible pump;

[0013] Preferably, the liquid outlet pipe of the storage tank is provided with a first valve.

[0014] Preferably, the pump outlet pipe is provided with a second valve.

[0015] Preferably, the pump air return pipe is provided with a third valve.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The utility model optimizes the installation space of the pump pool to the maximum extent by installing the pump pool at the bottom of one end of the outer shell of the tank, and the pump pool is located inside the connection place, and the connection place is used to install valves, pipelines, etc. attached to the storage tank, thereby shortening the pipeline length between the cryogenic pump and the tank body, further reducing the pipeline pressure between the storage tank and the cryogenic pump, avoiding repeated precooling of the pump pool and the pipeline, and improving the operating efficiency and stability of the cryogenic pump;

[0018] 2. The cryogenic pump of the utility model is completely located inside the inner tank of the pump pool, and the cryogenic pump can be detachably installed on the pump pool flange cover. At the same time, the pump pool is also detachably installed on the pump pool flange cover. Therefore, when maintenance is required, it is only necessary to remove the pump pool from the flange cover. At this time, the cryogenic pump is completely exposed to the outside, which is convenient for maintenance of the cryogenic pump, and the installation and maintenance are convenient without affecting the normal storage work of the storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 for Figure 1 A magnified view of part A;

[0021] Figure 3 for Figure 1 Enlarged view of part B.

[0022] Among them, 1 inner container, 2 outer shell, 3 first vacuum interlayer, 4 storage tank liquid outlet pipe, 5 first valve, 6 first purge discharge valve, 7 first purge discharge pipe, 8 first cold insulation, 9 pump pool liquid inlet pipe, 10 second vacuum interlayer, 11 pump pool outer shell, 12 pump pool cold insulation, 13 pump pool liner, 14 low temperature pump, 15 pump pool flange cover, 16 pump pool flange, 17 pump connecting flange, 18 pump return pipe, 19 pump liquid outlet pipe, 20 second purge discharge valve, 21 second purge discharge pipe, 22 second valve, 23 third purge discharge valve, 24 third purge discharge pipe, 25 third valve, 26 vent pipe, 27 air vent mast, 28 air vent cap, 29 connecting place, 30 second cold insulation. DETAILED DESCRIPTION

[0023] The present invention is further explained below in conjunction with specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0024] like Figure 1-3As shown, a low-temperature liquid storage tank with a pump comprises a tank body, the tank body comprises an outer shell 2 and an inner container 1 arranged inside the outer shell 2, and a first vacuum interlayer 3 is formed between the outer shell 2 and the inner container 1; a connection place 29 is provided at one end of the tank body, and a pump pool is detachably installed at the bottom of the outer shell 2, and the pump pool is arranged outside the outer shell 2 and inside the connection place 29; a pump pool flange cover 15 is provided on the outer side of the bottom of the outer shell 2, and a pump pool flange 16 assembled on the pump pool flange cover 15 is provided at the upper end of the pump pool; the pump pool comprises a pump pool liner 13 and a pump pool shell 11, and a second vacuum interlayer 10 is formed between the pump pool shell 11 and the pump pool liner 13, and the outer wall of the pump pool liner 13 is provided with a pump pool Cold insulation 12, a cryogenic pump 14 is arranged inside the pump pool inner tank 13, the cryogenic pump 14 is completely located inside the pump pool inner tank 13, the cryogenic pump 14 is a cryogenic submersible pump, and a pump connecting flange 17 is arranged at the liquid outlet end of the cryogenic pump 14, and the pump connecting flange 17 is assembled on the pump pool flange cover 15; the pump pool inner tank 13 is provided with a pump pool liquid inlet pipe 9, the pump pool liquid inlet pipe 9 passes through the pump pool outer shell 11, the inner container 1 is provided with a storage tank liquid outlet pipe 4, the storage tank liquid outlet pipe 4 passes through the outer shell 2 and is connected with the pump pool liquid inlet pipe 9, the storage tank liquid outlet pipe 4 passes through the outer shell 2 The portion of the first purge discharge pipe 7 is provided, and the first purge discharge pipe 7 is provided with a first purge discharge valve 6; the portion of the storage tank liquid outlet pipe 4 passing through the outer shell 2, the pump pool The portion of the liquid inlet pipe 9 passing through the pump pool housing 11 is provided with a first cold insulation 8; the storage tank liquid outlet pipe 4 is provided with a first valve 5; the liquid outlet end of the cryogenic pump 14 is provided with a pump liquid outlet pipe 19, the pump liquid outlet pipe 19 passes through the pump pool flange cover 15 and passes through the outer shell 2 after passing through the first vacuum interlayer 3, the portion of the pump liquid outlet pipe 19 passing through the outer shell 2 is provided with a second purge discharge pipe 21, and the second purge discharge pipe 21 is provided with a second purge discharge valve 20; the portion of the pump liquid outlet pipe 19 passing through the outer shell 2 is provided with a second cold insulation 30; the pump liquid outlet pipe 19 is provided with a second valve 22; the pump pool flange cover 15 is provided with a pump return air pipe 18, one end of the pump return air pipe 18 is connected to the inside of the pump pool liner, and the other end of the pump return air pipe 18 is connected to the inside of the pump pool liner. The end is connected to the inner container 1, one section of the pump return air pipe 18 passes through the first vacuum interlayer 3 and goes out of the outer shell 2, the part of the pump return air pipe 18 passing through the outer shell 2 is provided with a third purge discharge pipe 24, the third purge discharge pipe 24 is provided with a third purge discharge valve 23, and the pump return air pipe 18 is provided with a third valve 25; the first purge discharge pipe 7, the second purge discharge pipe 21 and the third purge discharge pipe 24 are all located inside the connecting place 29; the connecting place 29 is provided with a vent pipe 26, the vent pipe 26 is respectively connected to the first purge discharge pipe, the second purge discharge pipe and the third purge discharge pipe, the vent pipe 26 is provided with a vent mast 27 passing through the connecting place 29, and the end of the vent mast 27 is provided with a vent cap 28.

[0025] The specific working process and principle of the utility model are as follows: the pump pool is installed at the bottom of one end of the outer shell 2, and the pump pool is located inside the connection place 29, and the connection place 29 is used to install the equipment, valves, pipelines and instruments attached to the storage tank, so as to optimize the installation space of the pump pool to the greatest extent, and integrate the cryogenic pump 14 with the tank body, greatly shorten the length of the pipeline between the pump pool and the tank body, further reduce the pipeline pressure, avoid repeated precooling of the pump pool and the pipeline, and improve the operation efficiency and stability of the cryogenic pump 14; when the cryogenic pump 14 needs to be repaired, first inject gas through the second purge discharge pipe 21, press the liquid back to the inner container 1 through the storage tank outlet pipe 4 as much as possible, and then open the first purge discharge valve 6, the second purge discharge valve 6, and the second purge discharge valve 6. The second purge discharge valve 20 and the third purge discharge valve 23 further vaporize the residual liquid and discharge it centrally through the connected vent pipe 26; if the medium is flammable, explosive or other dangerous gas (such as LNG), after the discharge is completed, continue to open the first purge discharge valve 6, connect the nitrogen pipe to blow in nitrogen, and at the same time, open the second purge discharge valve 20 and the third purge discharge valve 23 to completely blow out the residual gas and completely replace it with nitrogen; after the replacement is completed, the entire pump pool can be disassembled, and the cryogenic pump 14 is completely exposed, and on-site maintenance can be carried out; if the cryogenic pump 14 needs to be disassembled, the pump connection flange 17 can be removed; when installing, the steps are reversed.

[0026] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0028] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A cryogenic liquid storage tank with a pump, characterized in that: The tank body comprises a tank body, which comprises an outer shell and an inner container arranged inside the outer shell, and a first vacuum interlayer is formed between the outer shell and the inner container; a connection place is provided at one end of the tank body, and a pump pool is detachably installed on the bottom of the outer shell, and the pump pool is arranged on the outside of the outer shell and located inside the connection place; a pump pool flange cover is provided on the outer side of the bottom of the outer shell, and a pump pool flange assembled on the pump pool flange cover is provided on the upper end of the pump pool; the pump pool comprises a pump pool liner and a pump pool outer shell, and a second vacuum interlayer is formed between the pump pool outer shell and the pump pool liner, and a pump pool cold insulation is provided on the outer wall of the pump pool inner shell, a low-temperature pump is provided inside the pump pool inner shell, and the low-temperature pump is completely located inside the pump pool inner shell, and a pump connecting flange is provided at the liquid outlet end of the low-temperature pump, and the pump connecting flange is assembled on the pump pool flange cover; the pump pool inner shell is provided with a pump pool liquid inlet pipe, and the pump pool liquid inlet pipe passes through Out of the pump pool shell, the inner container is provided with a storage tank liquid outlet pipe, the storage tank liquid outlet pipe passes through the outer shell and is connected with the pump pool liquid inlet pipe, the part of the storage tank liquid outlet pipe passing through the outer shell is provided with a first purge discharge pipe, and the first purge discharge pipe is provided with a first purge discharge valve; the liquid outlet end of the low-temperature pump is provided with a pump liquid outlet pipe, the pump liquid outlet pipe passes through the pump pool flange cover and passes through the outer shell after the first vacuum interlayer, the part of the pump liquid outlet pipe passing through the outer shell is provided with a second purge discharge pipe, and the second purge discharge pipe is provided with a second purge discharge valve; the pump pool flange cover is provided with a pump return air pipe, one end of the pump return air pipe is connected to the inside of the pump pool liner, and the other end of the pump return air pipe is connected to the inner container, one section of the pump return air pipe passes through the first vacuum interlayer to pass through the outer shell, and the part of the pump return air pipe passing through the outer shell is provided with a third purge discharge pipe, and the third purge discharge pipe is provided with a third purge discharge valve.

2. The cryogenic liquid storage tank with a pump according to claim 1, characterized in that: A vent pipe is provided in the connection place, and the vent pipe is respectively connected to the first purge discharge pipe, the second purge discharge pipe and the third purge discharge pipe. The vent pipe is provided with a ventilation mast passing through the connection place, and a ventilation cap is provided at the end of the ventilation mast.

3. The cryogenic liquid storage tank with a pump according to claim 1, characterized in that: The first purge exhaust pipe, the second purge exhaust pipe and the third purge exhaust pipe are all located inside the connection location.

4. The cryogenic liquid storage tank with a pump according to claim 1, characterized in that: The portion of the storage tank liquid outlet pipe passing through the outer shell and the portion of the pump pool liquid inlet pipe passing through the pump pool outer shell are both provided with a first cold-keeping insulation.

5. The cryogenic liquid storage tank with a pump according to claim 1, characterized in that: The portion of the pump outlet pipe passing through the outer shell is provided with a second cold-keeping insulation.

6. The cryogenic liquid storage tank with a pump according to claim 1, characterized in that: The cryogenic pump is a cryogenic submersible pump.

7. The cryogenic liquid storage tank with a pump according to claim 1, characterized in that: The liquid outlet pipe of the storage tank is provided with a first valve.

8. The cryogenic liquid storage tank with a pump according to claim 1, characterized in that: The pump liquid outlet pipe is provided with a second valve.

9. The cryogenic liquid storage tank with a pump according to claim 1, characterized in that: The pump air return pipe is provided with a third valve.

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