Composite material Dewar container for containing liquid nitrogen

Abstract

The utility model relates to the technical field of Dewar containers, and discloses a composite material Dewar container containing liquid nitrogen, which comprises a Dewar tank, the Dewar tank comprises an inner layer, a first vacuum layer and an outer layer from inside to outside, an annular groove is arranged in the middle of the upper surface of the Dewar tank, and a sealing ring gasket is fixedly connected with the inner wall of the annular groove. When the Dewar container containing the liquid nitrogen is used, the weight is reduced, the corrosion resistance and the low-temperature resistance are better due to the fact that the composite material glass fiber reinforced plastic is adopted, gas leakage and external pollution are effectively prevented through the design of the blanking cap and the sealing ring gasket, the sealing performance of the container is improved, and the service life of the container is prolonged. Through the design of the double vacuum layers of the first vacuum layer and the second vacuum layer and the cooperation of the gel coat, the effect of sealing tiny holes and defects can be achieved, the heat insulation effect is further enhanced, heat conduction is reduced, the retention time of liquid nitrogen is longer, and energy loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of Dewar containers, in particular to a composite material Dewar container for containing liquid nitrogen. Background Art

[0002] As we all know, liquid nitrogen is a colorless, tasteless, and odorless liquid, mainly formed by the liquefaction of nitrogen gas at extremely low temperatures. Its boiling point is -196°C (77K), and it is highly volatile at room temperature and pressure. Liquid nitrogen has a wide range of applications in industry, medicine, scientific research, and other fields. It is mainly used as a coolant, such as in the rapid freezing of frozen foods, preserving biological samples and organs, providing a low-temperature environment for superconducting magnets, cooling and quenching in metal processing, controlling and cooling chemical reactions, and as a cooling medium for various process steps in industrial production. During storage and transportation, liquid nitrogen requires the use of Dewar containers for effective insulation and protection.

[0003] However, traditional Dewar containers for liquid nitrogen are usually made of metal materials (such as aluminum or stainless steel), which are usually heavy and inconvenient to carry and operate. Although some metals (such as stainless steel) have certain corrosion resistance, they may oxidize or corrode in certain chemical media or under low temperature conditions, affecting their service life. Therefore, technical improvements are urgently needed. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a composite material Dewar container for liquid nitrogen. When the Dewar container for liquid nitrogen is used, the composite material fiberglass is adopted, which not only reduces the weight but also improves the corrosion resistance and low-temperature resistance. The design of the plug cover and the sealing ring gasket effectively prevents gas leakage and external contamination, thereby improving the sealing performance of the container. The double vacuum layer design of the vacuum layer 1 and the vacuum layer 2, combined with the gel coat, can seal small pores and defects, further enhance the thermal insulation effect, reduce heat conduction, prolong the liquid nitrogen retention time, and reduce energy loss.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A composite material Dewar container for liquid nitrogen comprises a Dewar tank, which comprises, from the inside to the outside, an inner layer, a first vacuum layer, and an outer layer. An annular groove is provided in the middle of the upper surface of the Dewar tank, a sealing ring gasket is fixedly connected to the inner wall of the annular groove, and a plugging cover is threadedly connected to the upper end of the Dewar tank via a plurality of fastening bolts, and a second vacuum layer is provided inside the plugging cover.

[0007] Through the above technical solution, compared with the existing Dewar container for liquid nitrogen, the Dewar container for liquid nitrogen, when in use, adopts the composite material fiberglass, which not only reduces the weight but also improves the corrosion resistance and low-temperature resistance. The design of the plug cover and the sealing ring gasket effectively prevents gas leakage and external contamination, and improves the sealing performance of the container. The double vacuum layer design of the vacuum layer 1 and the vacuum layer 2, combined with the gel coat, can seal tiny pores and defects, further enhance the insulation effect, reduce heat conduction, make the liquid nitrogen retention time longer, and reduce energy loss.

[0008] Furthermore, a connecting pipe is provided at the upper end of the outer wall of one side of the Dewar tank, and a pressure vacuum gauge is provided at the upper end of the outer wall of the connecting pipe;

[0009] With the above technical solution, it is convenient to evacuate the vacuum layer through the pipe, and it is convenient to check the internal vacuum effect through the pressure vacuum gauge.

[0010] Furthermore, the inner layer, outer layer and plug cover are all made of glass fiber reinforced plastics;

[0011] Through the above technical solution, the fiberglass material is light in weight and has better corrosion resistance and low temperature resistance.

[0012] Furthermore, the inner and outer walls of the dewar tank and the plug cover are coated with gel coat;

[0013] Through the above technical solution, the epoxy resin material is used in the gel coat to protect the composite material from the influence of the external environment and extend the service life.

[0014] Furthermore, a storage groove is provided in the middle of the upper surface of the Dewar tank;

[0015] Through the above technical solution, liquid nitrogen can be stored conveniently through the storage tank.

[0016] The utility model has the following beneficial effects:

[0017] 1. The present invention proposes a composite material Dewar container for liquid nitrogen. Compared with existing Dewar containers for liquid nitrogen, the composite material fiberglass-reinforced plastic is used in this Dewar container, which not only reduces weight but also improves corrosion resistance and low-temperature resistance. The design of the plug cover and the sealing ring gasket effectively prevents gas leakage and external contamination, thereby improving the sealing performance of the container. The double vacuum layer design of the vacuum layer 1 and the vacuum layer 2, combined with the gel coat, can seal tiny pores and defects, further enhancing the thermal insulation effect, reducing heat conduction, extending the liquid nitrogen retention time, and reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is an axonometric view of a composite material Dewar container for liquid nitrogen proposed in the present invention;

[0019] Figure 2 This is a schematic diagram of the explosion of a plug cover in a composite material Dewar container for liquid nitrogen proposed in the present invention;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0021] Figure 4 This is an axial cross-sectional view of a composite material Dewar container for liquid nitrogen proposed in the present invention;

[0022] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0023] Legend:

[0024] 1. Dewar jar; 11. Storage tank; 12. Inner layer; 13. Vacuum layer 1; 14. Outer layer; 15. Annular groove; 16. Sealing ring gasket; 2. Plug cover; 21. Vacuum layer 2; 3. Connecting pipe; 31. Pressure vacuum gauge. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Reference Figure 1-5 , an embodiment provided by the utility model:

[0027] A composite material Dewar container for liquid nitrogen includes a Dewar tank 1. The Dewar tank 1 includes an inner layer 12, a vacuum layer 13, and an outer layer 14 from the inside to the outside. An annular groove 15 is provided in the middle of the upper surface of the Dewar tank 1. A sealing ring gasket 16 is fixedly connected to the inner wall of the annular groove 15. The upper end of the Dewar tank 1 is threadedly connected to a plug cover 2 via multiple fastening bolts. A vacuum layer 21 is provided inside the plug cover 2.

[0028] Compared with the existing Dewar container for liquid nitrogen, the Dewar container for liquid nitrogen adopts the composite material fiberglass, which not only reduces the weight but also improves the corrosion resistance and low-temperature resistance. The design of the plug cover 2 and the sealing ring gasket 16 effectively prevents gas leakage and external contamination, and improves the sealing performance of the container. The double vacuum layer design of the vacuum layer 13 and the vacuum layer 2 21, as well as the gel coat, can seal tiny pores and defects, further enhance the insulation effect, reduce heat conduction, make the liquid nitrogen retention time longer, and reduce energy loss.

[0029] A connecting pipe 3 is provided at the upper end of the outer wall of one side of the Dewar tank 1, and a pressure vacuum gauge 31 is provided at the upper end of the outer wall of the connecting pipe 3. The connecting pipe 3 is used to facilitate the extraction of vacuum from the vacuum layer 13, and the pressure vacuum gauge 31 is used to facilitate the inspection of the internal vacuum effect. The inner layer 12, the outer layer 14 and the plugging cover 2 are all made of fiberglass. The fiberglass material is lightweight and has better corrosion resistance and low-temperature resistance. The inner and outer walls of the Dewar tank 1 and the plugging cover 2 are coated with gel coat. The use of epoxy resin material in the gel coat can protect the composite material from the influence of the external environment such as moisture and chemicals, thereby extending the service life. A storage groove 11 is provided in the middle of the upper surface of the Dewar tank 1, and the storage groove 11 is used to facilitate the storage of liquid nitrogen.

[0030] Working principle: When in use, liquid nitrogen is poured into the storage tank 11. The vacuum state in the vacuum layer 13 prevents heat from being transferred from the outside to the inner layer 12, thereby maintaining the low temperature state of the liquid nitrogen. The annular groove 15 and the sealing ring gasket 16 ensure the sealing of the Dewar tank 1, preventing external air from entering the vacuum layer 13. The plug cover 2 is sealed at the upper end of the Dewar tank 1, and a vacuum layer 2 21 is also provided inside, which further enhances the insulation effect.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A composite material Dewar container for liquid nitrogen, comprising a Dewar tank (1), characterized in that: The Dewar tank (1) comprises an inner layer (12), a vacuum layer 1 (13) and an outer layer (14) from the inside to the outside. An annular groove (15) is provided in the middle of the upper surface of the Dewar tank (1). A sealing ring gasket (16) is fixedly connected to the inner wall of the annular groove (15). The upper end of the Dewar tank (1) is threadedly connected to a blocking cover (2) via a plurality of fastening bolts. A vacuum layer 2 (21) is provided inside the blocking cover (2).

2. A composite material Dewar container for liquid nitrogen according to claim 1, characterized in that: A connecting pipe (3) is provided at the upper end of the outer wall of one side of the Dewar tank (1), and a pressure vacuum gauge (31) is provided at the upper end of the outer wall of the connecting pipe (3).

3. The composite material Dewar container for liquid nitrogen according to claim 1, characterized in that: The inner layer (12), the outer layer (14) and the plug cover (2) are all made of glass fiber reinforced plastic.

4. The composite material Dewar container for liquid nitrogen according to claim 1, characterized in that: The inner and outer walls of the Dewar jar (1) and the plug cover (2) are both coated with gel coat.

5. The composite material Dewar container for liquid nitrogen according to claim 1, characterized in that: A storage groove (11) is provided in the middle of the upper surface of the Dewar tank (1).

Images