Overflow device for liquid nitrogen cold trap

Abstract

The utility model discloses an overflow discharge device for a liquid nitrogen cold trap, comprising a cover body, an inner cylinder, a filling pipe, and an overflow prevention cover. The cover body is provided with a filling pipe, one end of the filling pipe extends to the inner cylinder and is provided with an overflow prevention cover, the bottom of the cover body is provided with an outer cylinder, one side of the outer cylinder is provided with a vacuum pump interface, the inner cylinder is provided with an inner cylinder, the outer surface of the inner cylinder is connected with a flow guide cover, and the outer side of the inner cylinder is provided with a flow guide hole. The utility model reduces the storage amount of liquid nitrogen in the inner cylinder by using the flow guide hole in conjunction with the outer cylinder, avoids the accumulation of liquid nitrogen in the inner cylinder, thereby causing overflow, reduces the impact force of the liquid nitrogen flow, and avoids the generation of liquid nitrogen gas. When the liquid nitrogen in the inner cylinder overflows, the liquid nitrogen is received by the flow guide cover on the outer cylinder, reducing the impact of the liquid nitrogen on the liquid nitrogen cold trap when it falls, thereby improving the safety of use.

Description

Technical Field

[0001] The utility model relates to the relevant field of liquid nitrogen cold traps, in particular to an overflow discharge device of a liquid nitrogen cold trap. Background Art

[0002] Nitrogen cold traps can use the low temperature characteristics of liquid nitrogen to quickly lower the gas temperature, thereby achieving efficient cooling. Liquid nitrogen cold traps can select appropriate condensation temperatures and pressures according to the boiling points and characteristics of different gases, so they have strong flexibility. Liquid nitrogen cold traps can be used for cooling and liquefying a variety of gases, so they are suitable for a variety of fields, such as scientific experiments, industrial production, etc.

[0003] After searching, Chinese utility model patent CN210751366U is a discharge device applied to liquid nitrogen cold trap, the discharge device has a double-layer structure, including a cup-shaped body and an antifreeze protection layer, the antifreeze protection layer is arranged on the outer surface of the cup-shaped body, the inner diameter of the cup-shaped body is larger than the outer diameter of the liquid nitrogen cold trap, and the bottom of the inner cavity of the cup-shaped body is connected to the bottom of the liquid nitrogen cold trap. Since the liquid nitrogen cold trap is accommodated in the discharge device, when the staff adds liquid nitrogen, once liquid nitrogen overflows from the liquid nitrogen cold trap, it can be contained by the discharge device, thereby avoiding the overflowed liquid nitrogen from causing harm to equipment or personnel.

[0004] The existing device may have the following problems when in use: when liquid nitrogen is transported to the liquid nitrogen cold trap, the liquid nitrogen generates gas during transportation, causing the gas pressure of the liquid nitrogen cold trap to be unstable. At this time, the overflowing liquid nitrogen falls and impacts the liquid nitrogen cold trap to accelerate the flow of gas, thereby causing a safety hazard to the liquid nitrogen cold trap. Utility Model Content

[0005] The utility model aims to provide an overflow discharge device for a liquid nitrogen cold trap to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an overflow discharge device for a liquid nitrogen cold trap comprises a cover body, an inner cylinder, a filling pipe and an overflow prevention cover, wherein the cover body is provided with a filling pipe, one end of the filling pipe extends to the inner cylinder and is provided with an overflow prevention cover, the rising liquid nitrogen is dispersed through the overflow prevention cover on the bottom end of the filling pipe, so that the liquid nitrogen overflows the inner cylinder and enters the inner cylinder, and the liquid nitrogen flows downward through the cover body, the bottom of the cover body is provided with an outer cylinder, one side of the outer cylinder is provided with a vacuum pump interface, the inner cylinder is provided inside the outer cylinder, the outer surface of the inner cylinder is connected with a flow guide cover, the liquid nitrogen at the bottom of the outer cylinder is blocked by the flow guide cover when it rises, so as to prevent the liquid nitrogen from overflowing, a flow guide hole is provided on the outer side of the inner cylinder, the liquid nitrogen is poured into the inner cylinder through the filling pipe, and the liquid nitrogen is dispersed between the inner cylinder and the outer cylinder through the flow guide hole provided on the inner cylinder.

[0007] In a further embodiment, a discharge pipe is installed on the side of the outer cylinder away from the vacuum pump interface, and control valves are provided on the filling pipe and the discharge pipe to prevent liquid nitrogen leakage.

[0008] In a further embodiment, the overflow prevention cover and the flow guide cover are both configured to be conical, and the material of the overflow prevention cover and the flow guide cover are both configured to be stainless steel.

[0009] In a further embodiment, an interlayer is provided inside the outer tube, a heat preservation layer is provided inside the interlayer, and the material of the heat preservation layer is set to EPS heat preservation board to improve the heat preservation performance.

[0010] In a further embodiment, the angle between the inner wall of the deflector and the outer surface of the inner cylinder is set to 60° to prevent the liquid nitrogen from rising and leaking.

[0011] In a further embodiment, a valve is provided on the vacuum pump interface, and the pressure inside the liquid nitrogen cold trap can be increased or decreased by the vacuum pump, thereby improving the safety of use.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. By using the guide hole in conjunction with the outer cylinder, the storage amount of liquid nitrogen in the inner cylinder will be reduced, and the liquid nitrogen will not accumulate inside the inner cylinder, which will cause overflow, reduce the impact force of liquid nitrogen flow, and avoid the generation of liquid nitrogen gas. When the liquid nitrogen in the inner cylinder overflows, the liquid nitrogen will be received by the guide cover on the outer cylinder, reducing the impact of the liquid nitrogen on the liquid nitrogen cold trap when it falls, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the cover structure of the utility model;

[0017] Figure 4 It is a schematic diagram of the inner cylinder structure of the utility model.

[0018] In the figure: 1. cover body; 2. outer tube; 3. filling pipe; 4. overflow cover; 5. inner tube; 6. flow guide hole; 7. discharge pipe; 8. insulation layer; 9. vacuum pump interface; 10. flow guide cover. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] See also Figure 1-4 The utility model provides an embodiment: an overflow discharge device for a liquid nitrogen cold trap, comprising a cover body 1, an inner tube 5, a filling pipe 3, and an overflow prevention cover 4. An outer tube 2 is provided at the bottom of the cover body 1, a vacuum pump interface 9 is provided on one side of the outer tube 2, and a discharge pipe 7 is installed on the side of the outer tube 2 away from the vacuum pump interface 9. The vacuum pump interface 9 is connected to a vacuum pump to facilitate increasing or decreasing the pressure in the outer tube 2. Control valves are provided on the filling pipe 3 and the discharge pipe 7 to discharge liquid nitrogen through the discharge pipe 7. The vacuum pump interface 9 is provided with a control valve. A valve is provided, an interlayer is provided inside the outer cylinder 2, an insulation layer 8 is provided inside the interlayer, the insulation layer 8 is made of an EPS insulation board to improve the insulation performance of the liquid nitrogen cold trap, the angle between the inner wall of the flow guide 10 and the outer surface of the inner cylinder 5 is set to 60°, the outer surface of the inner cylinder 5 is connected with the flow guide 10, the liquid nitrogen overflows the inner cylinder 5 into the inner part of the outer cylinder 2, so that the flow guide 10 on the outer cylinder 2 receives the liquid nitrogen, reduces the impact of the liquid nitrogen on the liquid nitrogen cold trap when it falls, and improves the safety of use.

[0021] See also Figure 1-2 The cover body 1 is provided with a filling pipe 3 inside, one end of the filling pipe 3 extends to the inner tube 5 and an anti-overflow cover 4 is provided inside, the rising liquid nitrogen gas is dispersed by the anti-overflow cover 4 on the bottom end of the filling pipe 3 to avoid accumulation in the inner tube 5, which causes the filling pipe 3 to fail to work normally, the outer tube 2 is provided with an inner tube 5, the outer side of the inner tube 5 is provided with a guide hole 6, the liquid nitrogen is poured into the inner tube 5 through the filling pipe 3, and the liquid nitrogen is dispersed between the inner tube 5 and the outer tube 2 through the guide hole 6 provided on the inner tube 5, the anti-overflow cover 4 and the guide cover 10 are both set to be conical, and the material of the anti-overflow cover 4 and the guide cover 10 are both set to be stainless steel.

[0022] Working principle: liquid nitrogen is poured into the inner cylinder 5 through the filling pipe 3, and the liquid nitrogen is dispersed between the inner cylinder 5 and the outer cylinder 2 through the guide hole 6 opened on the inner cylinder 5. The rising liquid nitrogen gas is dispersed through the overflow prevention cover 4 on the bottom end of the filling pipe 3 to avoid accumulation in the inner cylinder 5, which causes the filling pipe 3 to fail to work normally, and the liquid nitrogen overflows the inner cylinder 5 into the outer cylinder 2, so that the guide cover 10 on the outer cylinder 2 receives the liquid nitrogen, reduces the impact of the liquid nitrogen on the liquid nitrogen cold trap when it falls, and improves the safety of use. By connecting the vacuum pump interface 9 to the vacuum pump, it is convenient to increase or reduce the pressure in the outer cylinder 2, and discharge the liquid nitrogen through the discharge pipe 7.

[0023] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A liquid nitrogen cold trap overflow device, comprising a cover body (1), an inner cylinder (5), a filling pipe (3), and an overflow prevention cover (4), characterized in that: The cover body (1) is provided with an infusion pipe (3) inside, one end of the infusion pipe (3) extends to the inside of the inner tube (5) and is provided with an overflow prevention cover (4), the bottom of the cover body (1) is provided with an outer tube (2), one side of the outer tube (2) is provided with a vacuum pump interface (9), the inner tube (5) is provided inside the outer tube (2), the outer surface of the inner tube (5) is connected with a flow guide cover (10), and the outer side of the inner tube (5) is provided with a flow guide hole (6).

2. The overflow device of the liquid nitrogen cold trap according to claim 1, characterized in that: A discharge pipe (7) is installed on the side of the outer cylinder (2) away from the vacuum pump interface (9), and control valves are provided on the filling pipe (3) and the discharge pipe (7).

3. The overflow device of the liquid nitrogen cold trap according to claim 1, characterized in that: The anti-overflow cover (4) and the flow guide cover (10) are both configured to be conical, and the anti-overflow cover (4) and the flow guide cover (10) are both configured to be made of stainless steel.

4. The overflow device of the liquid nitrogen cold trap according to claim 1, characterized in that: An interlayer is provided inside the outer tube (2), a heat-insulating layer (8) is provided inside the interlayer, and the material of the heat-insulating layer (8) is set to be an EPS heat-insulating board.

5. The overflow device of the liquid nitrogen cold trap according to claim 1, characterized in that: The included angle between the inner wall of the deflector (10) and the outer surface of the inner cylinder (5) is set to 60°.

6. The overflow device of the liquid nitrogen cold trap according to claim 1, characterized in that: The vacuum pump interface (9) is provided with a valve.

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