Efficient and stable helium liquefying device

Abstract

The utility model provides an efficient and stable helium liquefying device which comprises a primary cooling mechanism, a gas inlet pipe, an intermediate cooling mechanism, a liquefying mechanism, supporting legs and a liquid discharging pipe, the gas inlet pipe is fixed at the input end of the primary cooling mechanism, and the other end of the gas inlet pipe is connected with an external helium conveying mechanism; the input end of the intermediate cooling mechanism is connected with the output end of the primary cooling mechanism; the output end of the intermediate cooling mechanism is connected with the input end of the liquefying mechanism; supporting legs are fixed to the lower end of the liquefying mechanism, and a liquid discharging pipe is fixed to the output end of the liquefying mechanism. The backflow end of the liquefying mechanism is connected with the air inlet pipe through a backflow pipe, and a one-way valve is fixed to the middle of the backflow pipe. According to the arrangement of the helium liquefying device, helium can be cooled twice before being liquefied, so that the helium is stably transited to the liquefying temperature, and then the unliquefied helium can flow back through the backflow pipe.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gas liquefaction technical field especially relates to a helium high -efficient stable liquefying device. BACKGROUND

[0002] Helium is a kind of special gas that is widely used in scientific research, medical treatment, industry and many other fields, and its liquefaction process is crucial. Helium liquefying device is the key equipment for converting gaseous helium into liquid helium, and liquid helium plays an indispensable role in superconducting technology, magnetic resonance imaging (MRI) and other aspects due to its extremely low boiling point (about 4.2K).

[0003] In the structure of the existing helium liquefying device, a relatively simple single-stage cooling method is commonly used. This device usually only has one cooling mechanism, and helium is directly introduced into the cooling chamber to be cooled by the cooling liquid in the chamber once. The cooling liquid is usually a low-temperature medium such as liquid nitrogen, and a straight cylindrical heat exchange tube is arranged in the cooling chamber. Helium flows into the heat exchange tube from one end, exchanges heat with the cooling liquid during flowing through the heat exchange tube, and then flows out of the cooling chamber into the liquefaction link.

[0004] However, the existing helium liquefying device has the following disadvantages when used in practice:

[0005] Firstly, the existing helium liquefying device cannot continuously and stage-by-stage efficiently cool helium, and it is difficult to stably reach the ideal temperature for liquefaction, resulting in low liquefaction efficiency. Secondly, in the existing helium liquefying device, the contact area of the straight cylindrical heat exchange tube with the cooling liquid is limited, and the heat exchange is not sufficient. In addition, the existing helium liquefying device lacks an effective recovery mechanism for unliquefied helium, and the unliquefied helium is directly discharged, causing waste of resources.

[0006] Therefore, it is necessary to invent a helium high-efficiency stable liquefying device. UTILITY MODEL CONTENT

[0007] To solve the above problems, the utility model provides a helium high-efficiency stable liquefying device, and the technical scheme used is:

[0008] The utility model provides a kind of helium high-efficiency stable liquefying device, including primary cooling mechanism, intake pipe, middle cooling mechanism, liquefying mechanism, support leg and drain pipe, the input end of the primary cooling mechanism is fixed with intake pipe by joint, wherein the other end of intake pipe is connected with external helium conveying mechanism by joint;The primary cooling mechanism is fixed on the upper end of middle cooling mechanism by bolt, wherein the input end of middle cooling mechanism is connected with the output end of primary cooling mechanism;The middle cooling mechanism is fixed on the upper end of liquefying mechanism by bolt, and the output end of middle cooling mechanism is connected with the input end of liquefying mechanism;The lower end of the liquefying mechanism is fixed with several support legs by bolt, and the output end of liquefying mechanism is fixed with drain pipe.

[0009] Further, the primary cooling mechanism includes a first shell, a first heat exchange pipe, a gas delivery pipe and air holes, the first shell is fixed on the upper end of the middle cooling mechanism by bolt, and the inside of the first shell is fixed with the first heat exchange pipe;One end of the first heat exchange pipe is connected with the intake pipe by joint, and the other end of the first heat exchange pipe is fixed with the gas delivery pipe by joint, the other end of the gas delivery pipe is connected with the input end of the middle cooling mechanism by joint;The lower end of the first shell is provided with a plurality of air holes, and the air holes are communicated with the inside of the middle cooling mechanism, which can use the gas generated by the evaporation of the cooling liquid to preliminarily cool the helium.

[0010] Further, the middle cooling mechanism includes a second shell, an inner cavity, a second heat exchange pipe and an exhaust pipe, the second shell is fixed on the upper end of the liquefying mechanism by bolt, and the upper end of the second shell is fixed with the primary cooling mechanism by bolt;The outer side of the second shell is respectively fixed with a liquid inlet pipe and a liquid exchange pipe by hand valve, and the inside of the second shell is fixed with the second heat exchange pipe;The upper end of the second heat exchange pipe is connected with the output end of the primary cooling mechanism by joint, and the lower end of the second heat exchange pipe is fixed with the exhaust pipe by joint, wherein the other end of the exhaust pipe is connected with the input end of the liquefying mechanism;The inner cavity is communicated with the inside of the primary cooling mechanism, which can cool the helium again.

[0011] Further, the second heat exchange pipe is spirally arranged, and the outer side of the second heat exchange pipe is fixed with a spiral fin, which can improve the heat exchange efficiency of helium and cooling liquid.

[0012] Further, the liquefying mechanism includes a third shell, a liquid storage cavity, a throttle valve and a drain valve, the lower end of the third shell is fixed with several support legs by bolt, and the upper end of the third shell is fixed with the middle cooling mechanism by bolt;The inside of the third shell is provided with a liquid storage cavity, and the upper end of the inner wall of the third shell is fixed with a throttle valve, wherein the upper end of the throttle valve is fixed with the output end of the middle cooling mechanism;The lower end of the third shell is fixed with the drain pipe through the drain valve, which can liquefy the helium.

[0013] Further, the upper end outer side of the third shell is fixed with a backflow pipe, wherein the other end of the backflow pipe is fixed with the air inlet pipe through a joint, and the middle part of the backflow pipe is fixed with a one-way valve, so that the helium not liquefied by the throttle valve can flow back to the air inlet pipe.

[0014] Compared with the prior art, the helium liquefying device has the following beneficial effects:

[0015] The primary cooling mechanism and the intermediate cooling mechanism are matched, the gas volatilized by the cooling liquid and the cooling liquid body can continuously cool the helium twice, so that the helium can stably reach a temperature close to liquefaction, the second heat exchange pipe and the fins are arranged, the helium can be fully heat-exchanged with the cooling liquid, then the helium is cooled again through the liquefaction mechanism, and then the helium is liquefied and discharged, and in addition, the helium not liquefied can flow back through the backflow pipe. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0017] Figure 1 is a structural schematic view of the helium liquefying device.

[0018] Figure 2 is a structural schematic view of the primary cooling mechanism of the helium liquefying device.

[0019] Figure 3 is a structural schematic view of the intermediate cooling mechanism of the helium liquefying device.

[0020] Figure 4 is a structural schematic view of the second heat exchange pipe and the fins of the helium liquefying device.

[0021] Figure 5 is a structural schematic view of the liquefaction mechanism of the helium liquefying device.

[0022] In the drawings:

[0023] 1 - primary cooling mechanism, 11 - first shell, 12 - first heat exchange pipe, 13 - gas conveying pipe, 14 - air hole, 2 - gas inlet pipe, 3 - secondary cooling mechanism, 31 - second shell, 32 - inner cavity, 33 - second heat exchange pipe, 34 - gas outlet pipe, 35 - fin, 4 - liquid inlet pipe, 5 - liquid exchange pipe, 6 - liquefaction mechanism, 61 - third shell, 62 - liquid storage cavity, 63 - throttle valve, 64 - liquid discharge valve, 7 - supporting leg, 8 - liquid discharge pipe, 9 - return pipe, 10 - one-way valve. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] In the description of the present application, it should be understood that the terms "upper", "middle", "outer", "inner", "periphery" and the like indicate the orientation or positional relationship, which are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the indicated components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0026] Please refer to Figures 1 to 5 As shown in the drawings, the present application is a kind of helium high-efficiency stable liquefying device, including primary cooling mechanism 1, gas inlet pipe 2, secondary cooling mechanism 3, liquefaction mechanism 6, supporting leg 7 and liquid discharge pipe 8, the input end of primary cooling mechanism 1 is fixed with gas inlet pipe 2 by joint, wherein the other end of gas inlet pipe 2 is connected with external helium gas conveying mechanism by joint;Primary cooling mechanism 1 is fixed on the upper end of secondary cooling mechanism 3 by bolt, wherein the input end of secondary cooling mechanism 3 is connected with the output end of primary cooling mechanism 1;Secondary cooling mechanism 3 is fixed on the upper end of liquefaction mechanism 6 by bolt, and the output end of secondary cooling mechanism 3 is connected with the input end of liquefaction mechanism 6;The lower end of liquefaction mechanism 6 is fixed with a plurality of supporting legs 7 by bolt, and the output end of liquefaction mechanism 6 is fixed with liquid discharge pipe 8.

[0027] Specifically, the primary cooling mechanism 1 comprises a first shell 11, a first heat exchange pipe 12, a gas conveying pipe 13 and air holes 14, the first shell 11 is fixed on the upper end of the secondary cooling mechanism 3 by bolts, and the inside of the first shell 11 is fixed with the first heat exchange pipe 12; one end of the first heat exchange pipe 12 is connected with the gas inlet pipe 2 through a joint, and the other end of the first heat exchange pipe 12 is fixed with the gas conveying pipe 13 through a joint, and the other end of the gas conveying pipe 13 is connected with the input end of the secondary cooling mechanism 3 through a joint; a plurality of air holes 14 are provided on the lower end of the first shell 11, and the air holes 14 are communicated with the inside of the secondary cooling mechanism 3; when in use, the gas volatilized from the cooling liquid (liquid nitrogen) in the secondary cooling mechanism 3 can enter the inside of the first shell 11 through the air holes 14, and the first heat exchange pipe 12 can receive the helium gas discharged from the external helium gas conveying mechanism, the helium gas can exchange heat with the gas in the first shell 11, so that the helium gas is cooled, and finally the helium gas enters the inside of the secondary cooling mechanism 3 through the gas conveying pipe 13.

[0028] Specifically, the secondary cooling mechanism 3 comprises a second shell 31, an inner cavity 32, a second heat exchange pipe 33 and an exhaust pipe 34, the second shell 31 is fixed on the upper end of the liquefaction mechanism 6 by bolts, and the upper end of the second shell 31 is fixed with the primary cooling mechanism 1 by bolts; the outer side of the second shell 31 is fixed with the liquid inlet pipe 4 and the liquid exchange pipe 5 through manual valves respectively, and the inside of the second shell 31 is fixed with the second heat exchange pipe 33; the upper end of the second heat exchange pipe 33 is connected with the output end of the primary cooling mechanism 1 through a joint, and the lower end of the second heat exchange pipe 33 is fixed with the exhaust pipe 34 through a joint, and the other end of the exhaust pipe 34 is connected with the input end of the liquefaction mechanism 6; the inner cavity 32 is communicated with the inside of the primary cooling mechanism 1, and when in use, the inner cavity can be filled with cooling liquid (liquid nitrogen) through the liquid inlet pipe 4, and the gas volatilized from the cooling liquid (liquid nitrogen) can enter the inside of the first shell 11, and the second heat exchange pipe 33 can receive the helium gas discharged from the primary cooling mechanism 1, and the helium gas in the second heat exchange pipe 33 can exchange heat with the cooling liquid (liquid nitrogen), so that the helium gas is cooled again, and finally the helium gas is discharged into the liquefaction mechanism 6 through the gas conveying pipe 34, and in addition, the cooling liquid (liquid nitrogen) in the inner cavity 32 can be discharged through the liquid exchange pipe 5.

[0029] Specifically, the second heat exchange pipe 33 is spirally arranged, and the outer side of the second heat exchange pipe 33 is fixed with spiral fins 35, and when in use, the spiral second heat exchange pipe 33 can make the helium gas fully exchange heat with the cooling liquid (liquid nitrogen), and in addition, the spiral fins 35 can improve the heat exchange efficiency of the helium gas and the cooling liquid (liquid nitrogen) compared with the conventional array fins (compared with the conventional array fins, the spiral fins 35 have larger surface area, so that the cooling liquid (liquid nitrogen) has larger contact area with the fins 35, thereby improving the heat exchange efficiency).

[0030] Specifically, the liquefaction mechanism 6 comprises a third shell 61, a liquid storage cavity 62, a throttle valve 63 and a liquid discharge valve 64, the lower end of the third shell 61 is fixed with a plurality of supporting legs 7 through bolts, and the upper end of the third shell 61 is fixed with the intermediate cooling mechanism 3 through bolts; the inside of the third shell 61 is provided with the liquid storage cavity 62, and the inner wall of the third shell 61 is fixed with the throttle valve 63 at the upper end, wherein the upper end of the throttle valve 63 is fixed with the output end of the intermediate cooling mechanism 3; the lower end of the third shell 61 is fixed with a liquid discharge pipe 8 through the liquid discharge valve 64, when in use, the throttle valve 63 can receive the helium gas discharged by the intermediate cooling mechanism 3, then under the action of the throttle valve 63, the pressure of the helium gas is suddenly reduced, thereby causing the temperature of the helium gas to be further reduced, so as to realize liquefaction, and the helium liquid is discharged through the liquid discharge pipe 8 and the liquid discharge valve 64.

[0031] Specifically, the upper end of the third shell 61 is fixed with a return pipe 9 on the outer side, wherein the other end of the return pipe 9 is fixed with the gas inlet pipe 2 through a joint, and the middle part of the return pipe 9 is fixed with a one-way valve 10, when in use, the helium gas not liquefied by the throttle valve 63 will flow back to the gas inlet pipe 2 through the return pipe 9, and secondly, the one-way valve 10 can prevent the helium gas from directly entering the third shell 61 from the gas inlet pipe 2.

[0032] Please refer to Figures 1-5 The working principle of the helium efficient and stable liquefaction device is as follows: when in use, first, the cooling liquid (liquid nitrogen) is filled into the inner cavity 32 through the liquid inlet pipe 4, then the helium gas is sent into the primary cooling mechanism 1 through the gas inlet pipe 2, so that the helium gas passes through the primary cooling mechanism 1, the intermediate cooling mechanism 3 and the liquefaction mechanism 6 in turn, wherein the helium gas is cooled twice by the primary cooling mechanism 1 and the intermediate cooling mechanism 3, then the helium gas is liquefied by the liquefaction mechanism 6, and finally discharged through the liquid discharge pipe 8.

[0033] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0034] The preferred embodiments disclosed above are only used to help describe the utility model. The preferred embodiments do not describe all the details and do not limit the utility model to the specific embodiments. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that the persons skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the entire scope and equivalents thereof.

Claims

1. A high-efficiency and stable helium liquefaction device, comprising a primary cooling mechanism (1), an inlet pipe (2), a secondary cooling mechanism (3), a liquefaction mechanism (6), a support leg (7), and a drain pipe (8), characterized in that: The primary cooling mechanism (1) has an air inlet pipe (2) fixed at its input end, and the other end of the air inlet pipe (2) is connected to an external helium delivery mechanism; the primary cooling mechanism (1) is fixed at the upper end of the intermediate cooling mechanism (3), and the input end of the intermediate cooling mechanism (3) is connected to the output end of the primary cooling mechanism (1); the intermediate cooling mechanism (3) is fixed at the upper end of the liquefaction mechanism (6), and the output end of the intermediate cooling mechanism (3) is connected to the input end of the liquefaction mechanism (6); the lower end of the liquefaction mechanism (6) is fixed with several support legs (7), and the output end of the liquefaction mechanism (6) is fixed with a drain pipe (8).

2. The helium high-efficiency and stable liquefaction device as described in claim 1, characterized in that: The primary cooling mechanism (1) includes a first outer shell (11), a first heat exchange tube (12), a gas supply pipe (13), and a vent (14). The first outer shell (11) is fixed to the upper end of the intermediate cooling mechanism (3), and the first heat exchange tube (12) is fixed inside the first outer shell (11). One end of the first heat exchange tube (12) is connected to the air inlet pipe (2), and the other end of the first heat exchange tube (12) is fixed to the gas supply pipe (13). The other end of the gas supply pipe (13) is connected to the input end of the intermediate cooling mechanism (3). A plurality of vents (14) are opened through the lower end of the first outer shell (11), wherein the vents (14) communicate with the interior of the intermediate cooling mechanism (3).

3. The helium high-efficiency and stable liquefaction device as described in claim 1, characterized in that: The intermediate cooling mechanism (3) includes a second outer shell (31), an inner cavity (32), a second heat exchange tube (33), and an exhaust pipe (34). The second outer shell (31) is fixed to the upper end of the liquefaction mechanism (6), and the primary cooling mechanism (1) is fixed to the upper end of the second outer shell (31). The outer side of the second outer shell (31) is fixed with an inlet pipe (4) and a liquid exchange pipe (5) through manual valves, and the second heat exchange tube (33) is fixed inside the second outer shell (31). The upper end of the second heat exchange tube (33) is connected to the output end of the primary cooling mechanism (1), and the lower end of the second heat exchange tube (33) is fixed with an exhaust pipe (34), wherein the other end of the exhaust pipe (34) is connected to the input end of the liquefaction mechanism (6). The inner cavity (32) is connected to the interior of the primary cooling mechanism (1).

4. The helium gas high-efficiency and stable liquefaction device as described in claim 3, characterized in that: The second heat exchange tube (33) is arranged in a spiral shape, and spiral fins (35) are fixed on the outer side of the second heat exchange tube (33).

5. The helium high-efficiency and stable liquefaction device as described in claim 1, characterized in that: The liquefaction mechanism (6) includes a third housing (61), a liquid storage chamber (62), a throttle valve (63), and a drain valve (64). The lower end of the third housing (61) is fixed with several support legs (7), and the upper end of the third housing (61) is fixed with an intermediate cooling mechanism (3). The liquid storage chamber (62) is opened inside the third housing (61), and the upper end of the inner wall of the third housing (61) is fixed with a throttle valve (63), wherein the upper end of the throttle valve (63) is fixed with the output end of the intermediate cooling mechanism (3). The lower end of the third housing (61) is fixed with a drain pipe (8) through the drain valve (64).

6. The helium high-efficiency and stable liquefaction device as described in claim 5, characterized in that: The upper outer side of the third housing (61) is fixed with a return pipe (9), the other end of which is fixed to the air inlet pipe (2), and a one-way valve (10) is fixed in the middle of the return pipe (9).

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