Pre-cooling and protecting system of cryogenic liquid pump and gas filling system

Abstract

The utility model belongs to the technical field of low-temperature liquid filling, and particularly relates to a pre-cooling and protecting system of a low-temperature liquid pump, which comprises a low-temperature liquid pump, a pre-cooling device and a protection device. The low-temperature liquid storage tank is located on one side of the water collecting tank, the bottom of the low-temperature liquid storage tank is connected with one end of the cavity through a conveying pipe, the top of the low-temperature liquid storage tank is connected with the cavity through a backflow pipe, and a first valve and a temperature detector are arranged on the backflow pipe; the water collecting tank is located under the cavity and located on one side of the low-temperature liquid pump, a water pump is fixedly installed in the water collecting tank, L-shaped pipes are symmetrically arranged on the water pump, and a faucet is installed at one end of each L-shaped pipe and located over the cavity in a threaded mode; the pre-cooling device ensures that the low-temperature liquid pump can be fully pre-cooled, ensures that the low-temperature liquid pump is cooled to a set temperature meeting the starting requirement, and prevents the low-temperature liquid pump from being damaged, the service life of the low-temperature liquid pump from being shortened and the subsequent normal use from being influenced.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-temperature liquid filling, in particular to a pre-cooling and protection system of a low-temperature liquid pump. Background Art

[0002] At present, the temperature of liquid helium is more than 260 degrees below zero. If it is directly connected to a cryogenic liquid pump after coming out of the liquid tank, the entire equipment will be damaged because the cryogenic liquid pump cannot withstand the ultra-low temperature when the liquid helium is discharged from the liquid tank. Because for the filling of liquid helium, it is often necessary to set a vaporizer after the liquid tank, after the liquid is heated and converted into gas, it is connected to the compressor for gas filling.

[0003] For cryogenic liquid gases such as liquid nitrogen, liquid oxygen, liquid argon, and liquid carbon dioxide whose temperatures are not as low as liquid helium, they can be directly connected to a cryogenic liquid pump. The cost of a cryogenic liquid pump is lower than that of a compressor, and the working principle of a cryogenic liquid pump is different from that of a compressor, so no external air or oil will enter the gas to be filled.

[0004] That is, for liquid gases such as liquid nitrogen, liquid oxygen, liquid argon, and liquid carbon dioxide whose temperatures are not as low as those of liquid helium, the filling system is generally: cryogenic liquid storage tank - cryogenic liquid pump - high-pressure vaporizer - filling bottle. However, in actual use, some problems are still found, such as: when the cryogenic liquid pump is turned on, the cryogenic liquid (such as liquid nitrogen) flows from the storage tank through the cavity of the cryogenic liquid pump, and then flows into the vaporizer for vaporization. Since the lowest temperature of liquid nitrogen is -196 degrees Celsius, if the cryogenic liquid pump is not pre-cooled first, it will not only fail to start normally, but also cause certain damage to the cryogenic liquid pump, reducing the life of the cryogenic liquid pump and affecting subsequent normal use. In view of this, we propose a pre-cooling and protection system for the cryogenic liquid pump. Utility Model Content

[0005] The purpose of the utility model is to provide a pre-cooling and protection system for a cryogenic liquid pump to solve the problems raised in the above background technology.

[0006] In view of this, the utility model provides a pre-cooling and protection system for a cryogenic liquid pump, comprising:

[0007] A cryogenic liquid pump, one end of which is fixedly connected to a cavity;

[0008] A cryogenic liquid storage tank, wherein the cryogenic liquid storage tank is located on one side of the water collecting tank, and the bottom of the cryogenic liquid storage tank is connected to one end of the cavity through a delivery pipe, and the top of the cryogenic liquid storage tank is connected to the cavity through a return pipe, and a valve 1 and a temperature detector are provided on the return pipe;

[0009] A control device, wherein the control device is fixedly mounted on one side of the cryogenic liquid pump;

[0010] A water collecting tank is located directly below the cavity and on one side of the cryogenic liquid pump. A water pump is fixedly installed in the water collecting tank. An L-shaped tube is symmetrically arranged on the water pump. A faucet is threadedly installed at one end of the L-shaped tube and located directly above the cavity.

[0011] In the above technical solution, further, one end of the cryogenic liquid pump is fixed to the cavity by a plurality of bolts, and the control device is electrically connected to the cryogenic liquid pump and the temperature detector.

[0012] In this technical solution, the stability of the cryogenic liquid pump and the cavity structure is ensured, and the temperature detector detects that the cryogenic liquid in the return pipe has reached a suitable temperature before personnel can operate the control device and start the cryogenic liquid pump.

[0013] In the above technical solution, further, the water pump is fixed to the water collecting tank by a plurality of screws, and the L-shaped pipe is threadedly connected to the water outlet end of the water pump.

[0014] In this technical solution, it is ensured that the water pump can be stably fixed on the water collecting tank, and that the L-shaped pipe can be stably fixed on the water pump. At the same time, it is also convenient to replace the damaged L-shaped pipe.

[0015] In the above technical solution, further, both ends of the delivery pipe are threadedly connected to the bottom of the cryogenic liquid storage tank and one end of the cavity respectively.

[0016] In this technical solution, the structural stability of the delivery pipe is ensured, and when the delivery pipe is damaged, it can be quickly replaced.

[0017] In the above technical solution, further, a valve 2 is rotatably installed on the delivery pipe.

[0018] In the present technical solution, when valve 2 is opened, the cryogenic liquid in the cryogenic liquid storage tank can enter the cavity on the cryogenic liquid pump through the delivery pipe.

[0019] The present application also provides a gas filling system. In the above technical solution, further, a high-pressure gasifier is provided on one side of the water collecting tank, and the high-pressure gasifier is connected to the cavity through a second discharge pipe, and the high-pressure gasifier is connected to a filling bottle through a first discharge pipe to form a complete filling system.

[0020] In the above technical solution, further, both ends of the second discharge pipe are respectively threadedly connected to the high-pressure gasifier and the cavity.

[0021] In this technical solution, the structure of the discharge pipe 2 is ensured to be stable, and after the cryogenic liquid pump is started, valve 1 is closed, so that the cryogenic liquid in the upper cavity of the cryogenic liquid pump enters the high-pressure vaporizer through the discharge pipe 2.

[0022] In the above technical solution, further, both ends of the discharge pipe 1 are respectively threadedly connected to the high-pressure gasifier and the gas filling bottle.

[0023] In this technical solution, it is ensured that after the high-pressure vaporizer is started, the low-temperature liquid in the high-pressure vaporizer vaporizes and enters the gas filling bottle through the discharge pipe 1, and the discharge pipe 1 is also easy to replace if it is damaged.

[0024] The beneficial effects of the utility model are:

[0025] The pre-cooling and protection system of the cryogenic liquid pump starts the cryogenic liquid storage tank, allowing the cryogenic liquid storage tank to transport the cryogenic liquid inside to the cavity through the delivery pipe. At this time, the cryogenic liquid entering the cavity will vaporize and absorb a large amount of heat energy from the outside, so that frost will form on the surface of the cavity, and the outside temperature will also cause the frost on the surface of the cavity to quickly melt into water droplets and fall into the water collecting tank. At the same time, when valve 1 is opened, part of the cryogenic liquid will vaporize and enter the cryogenic liquid storage tank again through the reflux pipe, ensuring that the cryogenic liquid forms a circulation flow in the process of passing through the delivery pipe, the cavity and the reflux pipe, accelerating the The pre-cooling process of the cryogenic liquid pump allows the cryogenic liquid pump to be fully pre-cooled. At the same time, under the detection of the temperature detector, when the set starting temperature is reached, it is guaranteed that there will be no damage to the cryogenic liquid pump. Only then can the control device be manually operated and the cryogenic liquid pump be started. Then, open the faucet first, and then start the water pump. The water pump will suck the concentrated water in the water collection tank and drop it on the cavity through the L-shaped pipe and the faucet, so that the temperature in the cavity of the cryogenic liquid pump is not too low, thereby better protecting the cryogenic liquid pump, because during operation, the water in the faucet falls on the surface of the cavity and forms a heat-cold exchange. Through the above method, the cryogenic liquid pump can be quickly and fully cooled, which plays a good protective role on the performance of the cryogenic liquid pump, prolongs its service life, and better guarantees the subsequent gas filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0027] The symbols in the figure are:

[0028] 1. Cryogenic liquid pump; 11. Cavity; 2. Water collecting tank; 3. Water pump; 31. L-shaped pipe; 32. Faucet; 4. High-pressure vaporizer; 41. Discharge pipe 1; 5. Cryogenic liquid storage tank; 51. Delivery pipe; 6. Reflux pipe; 61. Valve 1; 7. Discharge pipe 2; 8. Gas bottle. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0030] In the description of the present application, it should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0032] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0033] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0034] Embodiment 1:

[0035] See also Figure 1 As shown, this embodiment provides a pre-cooling and protection system for a cryogenic liquid pump, comprising:

[0036] A cryogenic liquid pump 1, one end of which is fixedly connected to a cavity 11;

[0037] A cryogenic liquid storage tank 5, the cryogenic liquid storage tank 5 is located at one side of the water collecting tank 2, and the bottom of the cryogenic liquid storage tank 5 is connected to one end of the cavity 11 through a delivery pipe 51, and the top of the cryogenic liquid storage tank 5 is connected to the cavity 11 through a return pipe 6, and a valve 61 and a temperature detector are provided on the return pipe 6;

[0038] A control device, the control device is fixedly installed on one side of the cryogenic liquid pump 1;

[0039] The water collecting tank 2 is located directly below the cavity 11 and on one side of the cryogenic liquid pump 1. A water pump 3 is fixedly installed in the water collecting tank 2. An L-shaped tube 31 is symmetrically provided on the water pump 3. A faucet 32 ​​is threadedly installed at one end of the L-shaped tube 31 and located directly above the cavity 11.

[0040] Among them, the cryogenic liquid storage tank 5 is started, and the cryogenic liquid storage tank 5 is allowed to transport the cryogenic liquid therein to the cavity 11 through the delivery pipe 51. At this time, the cryogenic liquid entering the cavity 11 will vaporize and absorb a large amount of heat energy from the outside, so that frost will form on the surface of the cavity 11, and the outside temperature will also cause the frost on the surface of the cavity 11 to quickly melt and drip into the water collecting tank 2. At the same time, valve 1 61 is opened, and the cryogenic liquid will partially vaporize and enter the cryogenic liquid storage tank 5 again through the reflux pipe 6, ensuring that the cryogenic liquid forms a circulating flow in the process of passing through the delivery pipe 51, the cavity 11 and the reflux pipe 6, thereby accelerating the cryogenic liquid pump. The cooling process allows the cryogenic liquid pump to be fully pre-cooled. At the same time, under the detection of the temperature detector, when the set starting temperature is reached and it is guaranteed that there will be no damage to the cryogenic liquid pump 1, the control device can be manually operated and the cryogenic liquid pump 1 can be started. Then, the faucet 32 ​​is opened first, and then the water pump 3 is started. The water pump 3 will suck the water concentrated in the water collecting tank 2 and fall on the cavity 11 through the L-shaped pipe 31 and the faucet 32, so that the temperature in the cavity 11 of the cryogenic liquid pump 1 is not too low, thereby better protecting the cryogenic liquid pump, because during operation, the water in the faucet 32 ​​falls on the surface of the cavity 11 and forms a heat-cold exchange. Through the above method, the cryogenic liquid pump can be quickly and fully cooled, which plays a good protective role on the performance of the cryogenic liquid pump, prolongs its service life, and better guarantees the subsequent gas filling.

[0041] Embodiment 2:

[0042] This embodiment provides a pre-cooling and protection system for a cryogenic liquid pump. In addition to the technical solutions of the above-mentioned embodiments, it also has the following technical features: one end of the cryogenic liquid pump 1 is fixed to the cavity 11 by a plurality of bolts, and the control device is electrically connected to the cryogenic liquid pump 1 and the temperature detector.

[0043] Among them, the low-temperature liquid pump 1 and the cavity 11 are ensured to be structurally stable, and the temperature detector is ensured to detect that the low-temperature liquid in the return pipe 6 has reached a suitable temperature before personnel can operate the control device and start the low-temperature liquid pump 1.

[0044] Embodiment 3:

[0045] This embodiment provides a pre-cooling and protection system for a cryogenic liquid pump. In addition to the technical solutions of the above-mentioned embodiments, it also has the following technical features: the water pump 3 is fixed to the water collecting tank 2 by a number of screws, and the L-shaped pipe 31 is threadedly connected to the water outlet end of the water pump 3.

[0046] Among them, it is ensured that the water pump 3 can be stably fixed on the water collecting tank 2 and the L-shaped tube 31 can be stably fixed on the water pump 3 . At the same time, it is also convenient to replace the damaged L-shaped tube 31 .

[0047] Embodiment 4:

[0048] This embodiment provides a pre-cooling and protection system for a cryogenic liquid pump. In addition to the technical solutions of the above embodiments, it also has the following technical features: both ends of the delivery pipe 51 are threadedly connected to the bottom of the cryogenic liquid storage tank 5 and one end of the cavity 11 respectively.

[0049] The structure of the delivery pipe 51 is ensured to be stable, and when the delivery pipe 51 is damaged, it can be quickly replaced.

[0050] Embodiment 5:

[0051] This embodiment provides a pre-cooling and protection system for a cryogenic liquid pump. In addition to the technical solutions of the above-mentioned embodiments, it also has the following technical features: a valve 2 is rotatably installed on the delivery pipe 51.

[0052] When the valve 2 is opened, the cryogenic liquid in the cryogenic liquid storage tank 5 can enter the cavity 11 on the cryogenic liquid pump 1 through the delivery pipe 51 .

[0053] Embodiment 6:

[0054] This embodiment provides a gas filling system provided in the present application. In addition to the technical solutions of the above embodiments, it also has the following technical features: a high-pressure gasifier 4 is also arranged on one side of the water collecting tank 2, and the high-pressure gasifier 4 is connected to the cavity 11 through a discharge pipe 7, and the high-pressure gasifier 4 is connected to a filling bottle 8 through a discharge pipe 41 to form a complete filling system.

[0055] Embodiment 7:

[0056] This embodiment provides a gas filling system provided by the present application. In addition to the technical solutions of the above embodiments, it also has the following technical features: both ends of the discharge pipe 7 are threadedly connected to the high-pressure gasifier 4 and the cavity 11 respectively.

[0057] Among them, the structure of the discharge pipe 2 7 is ensured to be stable, and after the cryogenic liquid pump 1 is started, the valve 1 61 is closed, so that the cryogenic liquid in the upper cavity 11 of the cryogenic liquid pump 1 enters the high-pressure vaporizer 4 through the discharge pipe 2 7 .

[0058] Embodiment 8:

[0059] This embodiment provides a gas filling system provided by the present application. In addition to the technical solutions of the above embodiments, it also has the following technical features: both ends of the discharge pipe 41 are threadedly connected to the high-pressure gasifier 4 and the filling bottle 8 respectively.

[0060] Among them, it is ensured that after the high-pressure vaporizer 4 is started, the low-temperature liquid in the high-pressure vaporizer 4 is vaporized and enters the gas filling bottle 8 through the discharge pipe 41, and when the discharge pipe 41 is damaged, it is also convenient to replace it.

[0061] Working principle: Start the cryogenic liquid storage tank 5, and let the cryogenic liquid storage tank 5 transport the cryogenic liquid therein to the cavity 11 through the delivery pipe 51. At this time, the cryogenic liquid entering the cavity 11 will vaporize and absorb a large amount of heat energy from the outside, so that frost will form on the surface of the cavity 11, and the outside temperature will also cause the frost on the surface of the cavity 11 to quickly melt into water droplets and fall into the water collecting tank 2. At the same time, open valve 161, the cryogenic liquid will partially vaporize and enter the cryogenic liquid storage tank 5 again through the reflux pipe 6, ensuring that the cryogenic liquid forms a circulating flow in the process of passing through the delivery pipe 51, the cavity 11 and the reflux pipe 6, thereby accelerating the cooling process of the cryogenic liquid pump and allowing the cryogenic liquid pump to be fully pre-cooled. At the same time, under the detection of the temperature detector, when the set starting temperature is reached, it is guaranteed that there will be no The cryogenic liquid pump 1 must be damaged before the control device can be manually operated and the cryogenic liquid pump 1 can be started. Then, the faucet 32 ​​is opened first, and then the water pump 3 is started. The water pump 3 will suck the water concentrated in the water collecting tank 2 and drop it on the cavity 11 through the L-shaped tube 31 and the faucet 32, so that the temperature in the cavity 11 on the cryogenic liquid pump 1 is not too low, and the cryogenic liquid pump 1 is better protected. Because during operation, the water in the faucet 32 ​​falls on the surface of the cavity 11 and forms a heat-cold exchange; at the same time, turn the valve 1 61, close the reflux pipe 6, and let the cryogenic liquid pump 1 drive the cryogenic liquid in the cavity 11 through the discharge pipe 2 7 into the high-pressure vaporizer 4, and then start the high-pressure vaporizer 4, and the high-pressure vaporizer 4 vaporizes the cryogenic liquid and transports it into the gas bottle 8 through the discharge pipe 1 41 to complete the filling.

[0062] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A precooling and protection system for a cryogenic liquid pump, characterized in that: include: A cryogenic liquid pump (1), one end of the cryogenic liquid pump (1) being fixedly connected to a cavity (11); A cryogenic liquid storage tank (5), the cryogenic liquid storage tank (5) being located on one side of the water collecting tank (2), and the bottom of the cryogenic liquid storage tank (5) being connected to one end of the cavity (11) via a delivery pipe (51), the top of the cryogenic liquid storage tank (5) being connected to the cavity (11) via a return pipe (6), and the return pipe (6) being provided with a valve 1 (61) and a temperature detector; A control device, the control device being fixedly mounted on one side of the cryogenic liquid pump (1); A water collecting tank (2), the water collecting tank (2) being located directly below the cavity (11) and on one side of the cryogenic liquid pump (1), a water pump (3) being fixedly installed in the water collecting tank (2), an L-shaped tube (31) being symmetrically provided on the water pump (3), and a faucet (32) being threadedly installed at one end of the L-shaped tube (31) and located directly above the cavity (11).

2. The cryogenic liquid pump precooling and protection system according to claim 1, characterized in that: One end of the cryogenic liquid pump (1) is fixed to the cavity (11) via a plurality of bolts, and the control device is electrically connected to the cryogenic liquid pump (1) and the temperature detector.

3. The precooling and protection system for a cryogenic liquid pump according to claim 1, characterized in that: The water pump (3) is fixed to the water collecting tank (2) by means of a plurality of screws, and the L-shaped pipe (31) is threadedly connected to the water outlet end of the water pump (3).

4. The precooling and protection system for a cryogenic liquid pump according to claim 1, characterized in that: Both ends of the delivery pipe (51) are threadedly connected to the bottom of the cryogenic liquid storage tank (5) and one end of the cavity (11), respectively.

5. The precooling and protection system for a cryogenic liquid pump according to claim 1, characterized in that: A second valve is rotatably mounted on the delivery pipe (51).

6. A gas filling system, comprising the pre-cooling and protection system for a cryogenic liquid pump according to any one of claims 1 to 5, characterized in that: A high-pressure gasifier (4) is also provided on one side of the water collecting tank. The high-pressure gasifier (4) is connected to the cavity via a second discharge pipe (7), and the high-pressure gasifier is connected to a gas filling bottle (8) via a first discharge pipe.

7. A gas filling system according to claim 6, characterized in that: The two ends of the second discharge pipe (7) are respectively threadedly connected to the high-pressure gasifier (4) and the cavity (11).

8. A gas filling system according to claim 6, characterized in that: The two ends of the discharge pipe 1 (41) are respectively threadedly connected to the high-pressure gasifier (4) and the gas filling bottle (8).

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