Liquid nitrogen storage tank

Abstract

The utility model relates to the technical field of liquid nitrogen storage equipment, and discloses a liquid nitrogen storage tank which comprises a tank body, a vehicle filling pump and an analysis sampling pipe, and the vehicle filling pump is connected with the tank body; the analysis sampling tube comprises a connecting piece, an instrument valve, a tube body and a joint; the pipe body is connected with the connecting piece, the instrument valve is arranged on the pipe body, and the connector is connected with the end, away from the connecting piece, of the pipe body and used for being connected with an analyzer. According to the technical scheme of the utility model, the analysis sampling pipe is connected with the vehicle filling pump, so that liquid nitrogen in the tank body can flow into the analysis sampling pipe through the vehicle filling pump, and further, external air is prevented from entering the tank body through the analysis sampling pipe to change the pressure of the positive pressure side of the liquid nitrogen storage tank during sampling; therefore, the influence of positive pressure side change of the liquid nitrogen storage tank on liquid level measurement of the liquid nitrogen storage tank is eliminated, and the accuracy of liquid level measurement of the liquid nitrogen storage tank is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid nitrogen storage equipment, in particular to a liquid nitrogen storage tank. Background Art

[0002] In the existing liquid nitrogen tank product purity analysis technology, the selection of analytical sampling points and the measurement method are key factors affecting the accuracy of product purity assessment in the tank. The traditional method usually performs sampling with a handheld analyzer on the positive pressure side of the tank level gauge and collects samples through a three-way connection.

[0003] However, during the measurement process, sampling on the positive pressure side of the tank will cause the pressure on the positive pressure side to change. Since the liquid level of the tank is calculated by the pressure difference between the positive pressure side and the negative pressure side of the differential pressure transmitter, when the pressure on the positive pressure side of the tank changes, the pressure difference between the positive pressure side and the negative pressure side of the differential pressure transmitter will change, which will affect the accuracy of the liquid nitrogen tank level measurement. Utility Model Content

[0004] The main purpose of the utility model is to provide a liquid nitrogen storage tank, aiming to improve the accuracy of liquid level measurement of the liquid nitrogen storage tank.

[0005] In order to achieve the above-mentioned purpose, the liquid nitrogen storage tank proposed by the utility model comprises:

[0006] Tank;

[0007] A vehicle charging pump, the vehicle charging pump being connected to the tank body;

[0008] An analysis sampling tube, the analysis sampling tube comprises a connector, an instrument valve, a tube body and a joint; the connector is connected to the end of the vehicle filling pump away from the tank body, the tube body is connected to the connector, the instrument valve is arranged on the tube body, the joint is connected to the end of the tube body away from the connector, and the joint is used to connect to an analyzer.

[0009] Optionally, the analysis sampling tube further comprises a flow regulating valve, wherein the flow regulating valve is arranged on the tube body and located between the instrument valve and the joint.

[0010] Optionally, the analysis sampling tube further comprises a flow meter, which is disposed on the tube body and located between the instrument valve and the flow regulating valve.

[0011] Optionally, the analysis sampling tube further comprises a pressure gauge, which is disposed on the tube body and located between the flow meter and the flow regulating valve.

[0012] Optionally, the analysis sampling tube further comprises a heating layer, wherein the heating layer is sleeved on the outer wall of the tube body and is used to heat the tube body.

[0013] Optionally, the analysis sampling tube further includes a temperature sensor, which is disposed on the inner wall of the tube body and is electrically connected to the heating layer.

[0014] Optionally, the analysis sampling tube further comprises a protective sleeve, wherein the protective sleeve is sleeved on a side of the heating layer away from the tube body.

[0015] Optionally, the tube body is arranged in a spiral shape.

[0016] Optionally, the tube body is made of stainless steel.

[0017] Optionally, the connection between the connecting piece and the tube body, and between the tube body and the joint are both welded.

[0018] In the technical solution of the utility model, the liquid nitrogen storage tank includes a tank body, a filling pump and an analysis sampling tube, the filling pump is connected to the tank body; the analysis sampling tube includes a connector, an instrument valve, a tube body and a joint; the connector is connected to the end of the filling pump away from the tank body, the tube body is connected to the connector, the instrument valve is arranged on the tube body, the joint is connected to the end of the tube body away from the connector, and the joint is used to connect to an analyzer. In the technical solution of the utility model, the analysis sampling tube is connected to the filling pump, and such an arrangement enables the liquid nitrogen in the tank body to flow into the analysis sampling tube through the filling pump, thereby avoiding the outside air from entering the tank body through the analysis sampling tube during sampling and changing the pressure on the positive pressure side of the liquid nitrogen storage tank, thereby eliminating the influence of the change on the positive pressure side of the liquid nitrogen storage tank on the liquid level measurement of the liquid nitrogen storage tank, and improving the accuracy of the liquid level measurement of the liquid nitrogen storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a structural schematic diagram of an embodiment of a liquid nitrogen storage tank provided by the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the analysis sampling tube in the liquid nitrogen storage tank of the utility model;

[0022] Figure 3 It is a cross-sectional view of the analysis sampling tube in the liquid nitrogen storage tank of the utility model.

[0023] Description of Figure Numbers:

[0024] Label name Label name 1000 Liquid nitrogen storage tank 35 Flow Control Valve 1 Tank 36 Flow Meter 2 Car filling pump 37 Pressure gauge 3 Analysis sampling tube 38 Heating layer 31 Connectors 39 Temperature Sensor 32 Instrument valve 310 Protective sleeve 33 tube body a Analyzer 34 Connectors

[0025] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0029] Please refer to Figure 1 and Figure 2 In order to solve the problem of inaccurate liquid level measurement of a liquid nitrogen storage tank 1000, the utility model proposes a liquid nitrogen storage tank 1000, comprising:

[0030] A tank body 1, a filling pump 2 and an analysis sampling tube 3, wherein the filling pump 2 is connected to the tank body 1; the analysis sampling tube 3 comprises a connector 31, an instrument valve 32, a tube body 33 and a joint 34; the connector 31 is connected to an end of the filling pump 2 away from the tank body 1, the tube body 33 is connected to the connector 31, the instrument valve 32 is arranged on the tube body 33, the joint 34 is connected to an end of the tube body 33 away from the connector 31, and the joint 34 is used to connect to an analyzer a.

[0031] In the technical solution of the utility model, the analysis sampling tube 3 is connected to the filling pump 2. Such an arrangement enables the liquid nitrogen in the tank body 1 to flow into the analysis sampling tube 3 through the filling pump 2, thereby preventing the outside air from entering the tank body 1 through the analysis sampling tube 3 during sampling and changing the pressure on the positive pressure side of the liquid nitrogen storage tank 1000, thereby eliminating the influence of the change on the positive pressure side of the liquid nitrogen storage tank 1000 on the liquid level measurement of the liquid nitrogen storage tank 1000, and improving the accuracy of the liquid level measurement of the liquid nitrogen storage tank 1000.

[0032] During the liquid nitrogen output process, if the flow rate of liquid nitrogen is too small, the pipeline will freeze and cause pipeline blockage, and if the flow rate of liquid nitrogen is too large, it may cause pipeline rupture and equipment damage. To solve this problem, in one embodiment, the analysis sampling tube 3 also includes a flow regulating valve 35, which is arranged in the tube body 33 and located between the instrument valve 32 and the connector 34. The flow regulating valve 35 enables the user to select the flow rate according to the sampling needs, so that the flow rate of liquid nitrogen in the analysis sampling tube can be controlled, thereby avoiding pipeline blockage or equipment damage, so as to extend the service life of the analysis sampling tube 3.

[0033] Furthermore, in one embodiment, the analysis sampling tube 3 further includes a flow meter 36, which is disposed in the tube body 33 and between the instrument valve 32 and the flow regulating valve 35. The user can use the flow meter 36 to monitor the flow of liquid nitrogen in the analysis sampling tube 3 in real time, and can adjust the opening of the flow regulating valve 35 according to the acquired data, so as to ensure that the flow in the pipeline is always within a safe delivery range to extend the service life of the analysis sampling tube 3.

[0034] In one embodiment, the analysis sampling tube 3 further includes a pressure gauge 37, which is disposed in the tube body 33 and between the flow meter 36 and the flow regulating valve 35. The pressure gauge 37 is used to monitor the pressure in the tube body 33 in real time to prevent the tube body 33 from being broken due to excessive pressure, thereby extending the service life of the analysis sampling tube 3.

[0035] Liquid nitrogen has a low temperature. If unheated liquid nitrogen flows directly into analyzer a, it will damage analyzer a. Figure 3 In order to solve this problem, in one embodiment, the analysis sampling tube 3 further includes a heating layer 38, which is sleeved on the outer wall of the tube body 33 and used to heat the tube body 33. The heating layer 38 heats the tube body 33 to transfer heat to the liquid nitrogen, thereby heating the liquid nitrogen to increase its temperature, thereby preventing the liquid nitrogen temperature from freezing the analyzer a and causing damage to the instrument, and facilitating use by users.

[0036] Furthermore, the analysis sampling tube 3 also includes a temperature sensor 39, which is arranged on the inner wall of the tube body 33 and is electrically connected to the heating layer 38. The temperature sensor 39 is used to detect the temperature of the liquid nitrogen in the tube body 33; the temperature sensor 39 is electrically connected to the heating layer 38 through the single chip microcomputer, and a set temperature is set on the single chip microcomputer. After the temperature sensor 39 obtains the temperature data, it sends a signal to the single chip microcomputer, and the single chip microcomputer obtains the temperature data and compares it with the set temperature; if the temperature data is lower than the set temperature, the single chip microcomputer controls the heating layer 38 to operate to heat the tube body 33, and after the temperature data reaches the set temperature after heating, the single chip microcomputer controls the heating layer 38 to stop. In this way, the automatic heating function of the analysis sampling tube 3 is realized, which is convenient for users to use.

[0037] In one embodiment, the analysis sampling tube 3 further includes a protective sleeve 310, which is sleeved on the side of the heating layer 38 away from the tube body 33. In actual operation, the user may touch the tube body 33, and the liquid nitrogen in the tube body 33 will transfer the temperature to the outer wall of the tube body 33. Therefore, in order to prevent the user from touching the outer wall and getting frostbite, the protective sleeve 310 is provided on the side of the heating layer 38 away from the tube body 33 to protect the user; at the same time, the protective sleeve 310 can protect the heating layer 38 from external damage, thereby extending the service life of the heating layer 38.

[0038] In one embodiment, the tube body 33 is arranged in a spiral shape. The tube body 33 is arranged in a spiral shape so that the tube body 33 can extend longer under the condition of occupying the same space. The longer tube body 33 makes the liquid nitrogen flow longer in the tube body 33, so that the liquid nitrogen flows longer in the tube body 33 under the condition of the liquid nitrogen flow speed remains unchanged, so that the liquid nitrogen can exchange heat with the outside more fully when flowing in the tube body 33, so that the liquid nitrogen can reach the ideal temperature before flowing to the analyzer a.

[0039] The material of the tube body 33 can be rubber or stainless steel. In one embodiment, the material of the tube body 33 is stainless steel. Stainless steel has higher material strength and is not easily damaged. Since the temperature of liquid nitrogen is relatively low, and the deformation amplitude of stainless steel due to thermal expansion and contraction is smaller, stainless steel is used as the material of the tube body 33 so that the liquid nitrogen flowing in the tube body 33 has less impact on the tube body 33. In summary, stainless steel is preferably used as the material of the tube body 33.

[0040] The connection between the connector 31 and the tube body 33 and the tube body 33 and the joint 34 may be threaded or welded. In one embodiment, the connection between the connector 31 and the tube body 33 and the tube body 33 and the joint 34 is welded. Using welding as the connection method between the connector 31 and the tube body 33 and the tube body 33 and the joint 34 can effectively ensure the sealing between the connector 31 and the tube body 33 and the tube body 33 and the joint 34, and reduce the probability of liquid nitrogen leakage.

[0041] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A liquid nitrogen storage tank (1000), characterized in that: include: Tank body (1); A vehicle charging pump (2), wherein the vehicle charging pump (2) is connected to the tank body (1); An analysis sampling tube (3), the analysis sampling tube (3) comprising a connecting piece (31), an instrument valve (32), a tube body (33) and a joint (34); the connecting piece (31) is connected to an end of the vehicle filling pump (2) away from the tank body (1), the tube body (33) is connected to the connecting piece (31), the instrument valve (32) is arranged on the tube body (33), the joint (34) is connected to an end of the tube body (33) away from the connecting piece (31), and the joint (34) is used to connect to an analyzer (a).

2. The liquid nitrogen storage tank (1000) according to claim 1, characterized in that: The analysis sampling tube (3) further comprises a flow regulating valve (35), wherein the flow regulating valve (35) is arranged on the tube body (33) and is located between the instrument valve (32) and the joint (34).

3. The liquid nitrogen storage tank (1000) according to claim 2, characterized in that: The analysis sampling tube (3) further comprises a flow meter (36), wherein the flow meter (36) is arranged on the tube body (33) and is located between the instrument valve (32) and the flow regulating valve (35).

4. The liquid nitrogen storage tank (1000) according to claim 3, characterized in that: The analysis sampling tube (3) further comprises a pressure gauge (37), wherein the pressure gauge (37) is arranged on the tube body (33) and is located between the flow meter (36) and the flow regulating valve (35).

5. The liquid nitrogen storage tank (1000) according to any one of claims 1 to 4, characterized in that: The analysis sampling tube (3) further comprises a heating layer (38), wherein the heating layer (38) is sleeved on the outer wall of the tube body (33) and is used to heat the tube body (33).

6. The liquid nitrogen storage tank (1000) according to claim 5, characterized in that: The analysis sampling tube (3) further comprises a temperature sensor (39), wherein the temperature sensor (39) is arranged on the inner wall of the tube body (33), and the temperature sensor (39) is electrically connected to the heating layer (38).

7. The liquid nitrogen storage tank (1000) according to claim 5, characterized in that: The analysis sampling tube (3) further comprises a protective sleeve (310), wherein the protective sleeve (310) is sleeved on a side of the heating layer (38) facing away from the tube body (33).

8. The liquid nitrogen storage tank (1000) according to any one of claims 1 to 4, characterized in that: The tube body (33) is arranged in a spiral shape.

9. The liquid nitrogen storage tank (1000) according to claim 8, characterized in that: The material of the tube body (33) is stainless steel.

10. The liquid nitrogen storage tank (1000) according to any one of claims 1 to 4, characterized in that: The connecting piece (31) and the tube body (33) as well as the tube body (33) and the joint (34) are both connected by welding.

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