Liquid nitrogen sampler

Abstract

The utility model discloses a liquid nitrogen sampler which comprises a tank body, a liquid nitrogen inlet connector is arranged at the upper end of the tank body, and a liquid nitrogen outlet connector is arranged at the lower end of the tank body; valves are arranged on the liquid nitrogen inflow joint and the liquid nitrogen discharge joint; the annular mounting plate is mounted on the inner wall of the tank body, and a through hole which is through up and down is formed in the annular mounting plate; the conical flow guide cover is mounted on the annular mounting plate, and the upper end of the conical flow guide cover is located under the liquid nitrogen inflow connector; and the pressure relief mechanism is arranged on the side wall of the tank body. The conical flow guide cover is arranged in the tank body, during sampling, liquid nitrogen entering the tank body falls on the conical flow guide cover and flows to the bottom of the tank body along the conical flow guide cover, shaking caused by mutual collision between the liquid nitrogen and liquid nitrogen stored in the tank body when the liquid nitrogen falls is reduced, and the volatilization speed of the liquid nitrogen is reduced.

Description

Technical Field

[0001] This utility model relates to the field of liquid nitrogen storage technology, specifically to a liquid nitrogen sampler. Background Technology

[0002] In laboratory experiments such as freeze-drying and cryogenic pulverization, liquid nitrogen is required. In these cases, a liquid nitrogen sampling container is typically used to extract a portion of liquid nitrogen from a large liquid nitrogen storage tank and add it to the corresponding experimental apparatus. During sampling, the liquid nitrogen sampling container is connected to the sampling port of the liquid nitrogen storage tank via a metal hose. After opening the valve on the sampling port of the liquid nitrogen storage tank, the liquid nitrogen in the storage tank falls into the liquid nitrogen sampling container. Due to the mutual impact of the liquid nitrogen particles, the liquid nitrogen in the sampling container experiences violent shaking. This shaking accelerates the evaporation of the liquid nitrogen and causes splashing, posing a significant safety hazard to personnel. Utility Model Content

[0003] To address the aforementioned issues, this application provides a liquid nitrogen sampler that reduces the shaking amplitude during liquid nitrogen sampling, preventing the liquid nitrogen from evaporating and splashing more rapidly.

[0004] The objective of this utility model is achieved through the following technical solution: a liquid nitrogen sampler, comprising:

[0005] The tank body has a liquid nitrogen inlet connector at the upper end and a liquid nitrogen outlet connector at the lower end; both the liquid nitrogen inlet connector and the liquid nitrogen outlet connector are equipped with valves.

[0006] A ring-shaped mounting plate is installed on the inner wall of the tank, and a through hole is provided on it.

[0007] A conical flow deflector is mounted on the annular mounting plate, with its upper end located directly below the liquid nitrogen inlet connector;

[0008] A pressure relief mechanism is installed on the side wall of the tank.

[0009] This invention features a conical guide shroud inside the tank. During sampling, the liquid nitrogen entering the tank falls onto the conical guide shroud and flows along it to the bottom of the tank, reducing the shaking caused by the liquid nitrogen falling and colliding with the liquid nitrogen already stored in the tank, thus slowing down the evaporation rate of the liquid nitrogen.

[0010] The upper circumferential part of the conical guide shroud has several vent holes. The gas formed by the evaporation of liquid nitrogen inside the conical guide shroud can be discharged from the top of the conical guide shroud through the vent holes so that it can be discharged from the pressure relief mechanism.

[0011] The pressure relief mechanism includes a pressure relief port formed on the side wall of the tank, a valve seat disposed within the pressure relief port, and a valve plate assembly disposed on the valve seat for opening or closing the valve seat.

[0012] The valve plate assembly includes a shaft with one end fixed to a valve seat and a limiting plate at the other end, a valve plate mounted on the shaft, and a spring sleeved on the shaft and located between the limiting plate and the valve plate; the valve plate can move along the shaft to open or close the valve seat.

[0013] When the pressure inside the tank reaches a certain value, the pressure relief mechanism is pushed open to release the pressure and prevent the tank from bursting due to excessive internal pressure.

[0014] The pressure relief mechanism also includes a protective cover; the protective cover is disposed on the outer wall of the tank and forms a buffer cavity between the protective cover and the outer wall of the tank, and the pressure relief port is located in the buffer cavity; a downward discharge port is also provided between the protective cover and the side wall of the tank.

[0015] The nitrogen gas discharged by the pressure relief mechanism is still at a very low temperature, and the protective cover can prevent the discharged gas from being ejected and causing safety hazards.

[0016] The liquid nitrogen discharge connector is also equipped with a splash guard, which can prevent liquid nitrogen from splashing when adding liquid nitrogen from the tank to the corresponding experimental device.

[0017] The outer wall of the tank is provided with a handle, which is located on the side away from the discharge port, so that the low-temperature gas discharged from the discharge port will not spray onto the user's hands.

[0018] Compared with the prior art, this application has the following beneficial effects:

[0019] (1) By setting a conical guide hood inside the tank, when sampling, the liquid nitrogen entering the tank falls on the conical guide hood and flows along the conical guide hood to the bottom of the tank, reducing the shaking caused by the liquid nitrogen falling and colliding with the liquid nitrogen already stored in the tank, and reducing the evaporation rate of liquid nitrogen.

[0020] (2) This utility model can prevent liquid nitrogen from splashing when it is added to the experimental device by means of a splash shield.

[0021] Some of the additional features of this application will be described in the following description. These additional features will become apparent to those skilled in the art upon examination of the following description and the accompanying drawings, or upon understanding the production or operation of the embodiments. The features disclosed in this application can be implemented and achieved through the practice or use of various methods, means, and combinations thereof with respect to the specific embodiments described below. Attached Figure Description

[0022] The accompanying drawings, which are provided to further illustrate this application and constitute a part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute a limitation thereof. In the drawings, the same reference numerals denote the same components.

[0023] Figure 1 This is a cross-sectional view of the present invention.

[0024] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0025] Figure 3 for Figure 1 Enlarged diagram of point B in the middle.

[0026] The reference numerals in the above figures are as follows: 1-tank body, 2-conical guide shield, 3-annular mounting plate, 4-vent, 5-handle, 6-splash shield, 7-liquid nitrogen discharge connector, 8-liquid nitrogen inflow connector, 9-pressure relief port, 10-valve seat, 11-valve plate, 12-spring, 13-shaft, 14-protective cover, 15-discharge port, 16-through hole, 17-buffer chamber. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments.

[0028] Example

[0029] like Figure 1 As shown, this embodiment discloses a liquid nitrogen sampler, including a tank 1. The tank 1 has a double-layer insulation structure, consisting of an inner tank and an outer tank located outside the inner tank. A vacuum is formed between the inner and outer tanks, thereby providing insulation for the tank 1. A liquid nitrogen inlet connector 8 is provided at the upper end of the tank 1, and a liquid nitrogen outlet connector 7 is provided at the lower end. Both the liquid nitrogen inlet connector 8 and the liquid nitrogen outlet connector 7 are equipped with valves. In use, the liquid nitrogen inlet connector 8 is connected to a liquid nitrogen storage tank via a metal hose, allowing liquid nitrogen from the storage tank to enter the tank 1 through the liquid nitrogen inlet connector 8. After the liquid nitrogen is transferred to the laboratory, the liquid nitrogen from the tank 1 is added to the corresponding experimental apparatus through the liquid nitrogen outlet connector 7.

[0030] An annular mounting plate 3 is installed inside the tank body 1. Specifically, the annular mounting plate 3 is circumferentially connected to the lower inner wall of the tank body 1. The annular mounting plate 3 has several through holes 16 extending vertically, thereby connecting the lower and upper spaces of the annular mounting plate 3 through the through holes 16. Figure 1 , 3 As shown.

[0031] In addition, a conical flow guide 2 is provided inside the tank body 1. The conical flow guide 2 is installed on the upper surface of the annular mounting plate 3, and the upper tip of the conical flow guide 2 is located directly below the liquid nitrogen inlet connector 8.

[0032] With the above structure, during sampling, the liquid nitrogen entering the tank 1 falls onto the conical guide shroud 2 and flows downwards along it, thereby reducing the shaking caused by the liquid nitrogen falling and colliding with the liquid nitrogen already stored in the tank 1, and reducing the evaporation rate of the liquid nitrogen. In addition, the conical guide shroud 2 also acts as a barrier, which can reduce the amplitude of the shaking of the liquid nitrogen in the tank 1 during the transfer of liquid nitrogen.

[0033] In addition, the liquid nitrogen inside the tank 1 will inevitably evaporate. Therefore, the tank in this embodiment is also equipped with a pressure relief mechanism, which is used to relieve pressure when the pressure inside the tank 1 is too high.

[0034] like Figure 1 As shown, the upper sidewall of the conical flow guide 2 is provided with several vent holes 4. In this embodiment, two vent holes 4 are provided, and the two vent holes 4 are symmetrically arranged. The gas formed by the evaporation of liquid nitrogen inside the conical flow guide 2 can be discharged from the vent holes 4 to the outside of the conical flow guide 2 so that it can be discharged from the pressure relief mechanism.

[0035] like Figure 2 As shown, the pressure relief mechanism includes a pressure relief port 9 formed on the side wall of the tank 1, a valve seat 10 disposed within the pressure relief port 9, and a valve plate assembly disposed on the valve seat 10 for opening or closing the valve seat 10. Specifically, the valve plate assembly includes a shaft 13 with one end fixed to the valve seat 10 and a limiting plate disposed at the other end, a valve plate 11 mounted on the shaft 13, and a spring 12 sleeved on the shaft 13 and located between the limiting plate and the valve plate 11; the valve plate 11 can move along the shaft 13 to open or close the valve seat 10.

[0036] The valve seat 10 has an air hole, and the valve plate 11 has a plug. The plug can block the air hole on the valve seat 10 to prevent external gas from entering the tank 1. Two shafts 13 are provided, symmetrically arranged on both sides of the air hole. Both shafts 13 are equipped with springs, and the installation method is the same. Figure 2 As shown.

[0037] When the pressure inside tank 1 reaches a certain value, the pressure inside tank 1 will push up valve plate 11, at which point valve plate 11 will separate from valve seat 10, spring 12 will be compressed, and gas inside tank 1 can be discharged from tank 1. When the pressure inside tank 1 returns to normal, under the thrust of spring 12, valve plate 11 will re-seal valve seat 10, thus preventing tank 1 from bursting due to excessive internal pressure.

[0038] Since the nitrogen gas discharged from the pressure relief mechanism is still very cold, it may still cause injury if sprayed directly onto the skin. Therefore, the pressure relief mechanism in this embodiment also includes a protective cover 14.

[0039] like Figure 2 As shown, the protective cover 14 is disposed on the outer wall of the tank body 1, and a buffer cavity 17 is formed between the protective cover 14 and the outer wall of the tank body 1. The pressure relief port 9 is located within the buffer cavity 17. In addition, a downward-facing discharge port 15 is also provided between the protective cover 14 and the side wall of the tank body 1.

[0040] The nitrogen gas ejected from the pressure relief mechanism is blocked by the protective cover 14 and first stays in the buffer chamber 17 to prevent the nitrogen gas from being sprayed directly onto human skin. The temperature of the nitrogen gas will rise to a certain extent in the buffer chamber 17, and after being buffered by the buffer chamber 17, it will be discharged from the discharge port 15 at a slower speed. This can reduce the safety hazards caused by gas ejection.

[0041] The outer wall of the tank 1 is provided with a handle 5, which allows for easy movement of the liquid nitrogen sampler. The handle 5 is located on the side away from the discharge port 15, so the cryogenic gas discharged from the discharge port 15 will not directly contact the user's hand.

[0042] In addition, such as Figure 1 As shown, the liquid nitrogen discharge connector 7 is also equipped with a splash guard 6, which is generally conical in shape, with its lower end resting on the lower end of the liquid nitrogen discharge connector 7. When liquid nitrogen from the tank 1 is added to the corresponding experimental device, the liquid nitrogen discharge connector 7 is connected to the inlet of the experimental device, and the splash guard 6 surrounds the outside of the connection position, which can prevent the added liquid nitrogen from splashing.

[0043] When placing the liquid nitrogen sampler, the splash guard 6 can also be used as a support foot. Of course, the liquid nitrogen sampler can also be placed on a mounting rack.

[0044] It should be noted that all features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any way, except for mutually exclusive features and / or steps.

[0045] Furthermore, the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this utility model, and these solutions all fall within the scope of this utility model and its protection. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and not intended to limit the scope of the claims. The scope of protection of this utility model is defined by the claims and their equivalents.

Claims

1. A liquid nitrogen sampler characterized by, The application relates to a liquid nitrogen tank. The tank body (1) is provided with a liquid nitrogen inflow joint (8) at the upper end and a liquid nitrogen discharge joint (7) at the lower end; the liquid nitrogen inflow joint (8) and the liquid nitrogen discharge joint (7) are both provided with valves; A ring-shaped mounting plate (3) is mounted on the inner wall of the tank body (1) and is provided with a through hole (16) penetrating from top to bottom; A conical fairing (2) is mounted on the ring-shaped mounting plate (3) and the upper end of the conical fairing (2) is located directly below the liquid nitrogen inflow joint (8); A pressure relief mechanism is arranged on the side wall of the tank body (1).

2. The liquid nitrogen sampler of claim 1, wherein, The upper end of the conical fairing (2) is provided with a plurality of air outlet holes (4) in the circumferential direction.

3. The liquid nitrogen sampler of claim 1, wherein, The pressure relief mechanism comprises a pressure relief port (9) arranged on the side wall of the tank body (1), a valve seat (10) arranged in the pressure relief port (9) and a valve plate assembly arranged on the valve seat (10) and used for opening or closing the valve seat (10).

4. The liquid nitrogen sampler of claim 3, wherein, The valve plate assembly comprises a shaft (13) with one end fixed on the valve seat (10) and the other end provided with a limiting plate, a valve plate (11) mounted on the shaft (13) and a spring (12) sleeved on the shaft (13) and located between the limiting plate and the valve plate (11); the valve plate (11) can move along the shaft (13) to open or close the valve seat (10).

5. The liquid nitrogen sampler of claim 3, wherein, The pressure relief mechanism further comprises a protective cover (14); the protective cover (14) is arranged on the outer wall of the tank body (1) and forms a buffer cavity (17) with the outer wall of the tank body (1), the pressure relief port (9) is located in the buffer cavity (17) and a downward discharge port (15) is further arranged between the protective cover (14) and the side wall of the tank body (1).

6. The liquid nitrogen sampler of claim 1, wherein, The liquid nitrogen discharge joint (7) is further provided with a splash-proof cover (6).

7. The liquid nitrogen sampler of claim 5, wherein, The outer wall of the tank body (1) is provided with a handle (5) located on the side away from the discharge port (15).

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