Liquid nitrogen liquid level detection device

Abstract

The utility model discloses a liquid nitrogen liquid level detection device which comprises a liquid level rod, a liquid nitrogen measuring structure and a protection structure, and the liquid level rod comprises a base, a measuring rod fixedly installed on the upper surface of the base and scale marks arranged on the surface of the measuring rod. Compared with the prior art, the first capacitive liquid level sensor and the second capacitive liquid level sensor can be used for directly measuring the lowest level and the highest level of liquid nitrogen in the liquid nitrogen cylinder outside the liquid nitrogen cylinder; the positions of the first capacitive liquid level sensor and the second capacitive liquid level sensor on the measuring rod can be changed by utilizing the fixing assembly, so that the heights of the first capacitive liquid level sensor and the second capacitive liquid level sensor can be changed according to the liquid nitrogen cylinders with different volumes and sizes; on one hand, the problem of inaccurate measurement caused by inclination of a pipe body when the pipe body is put into the liquid nitrogen cylinder in the prior art is avoided, and on the other hand, the device is arranged outside the liquid nitrogen cylinder, so that the device is convenient to measure and take.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid level detection field especially relates to a liquid nitrogen liquid level detection device. BACKGROUND

[0002] The liquid level measurement of liquid nitrogen can help users better manage the use of liquid nitrogen, avoid frequent replenishment of liquid nitrogen due to low liquid level, thereby improving the use efficiency, and the capacity of the liquid nitrogen tank is limited, if the liquid level is too high, liquid nitrogen may overflow, not only wasting resources, but also possibly polluting the environment.

[0003] China authorized announcement number CN221685607U discloses a kind of liquid nitrogen liquid level detection device, including pipe body and display device.The pipe body is separated into several airtight chambers along its length direction inside.The chamber is filled with brine.Display device includes power supply and several indicating lamp connected to power supply.Several indicating lamp is connected in parallel.Each indicating lamp is connected in series in a chamber.When using, pipe body is inserted into the bottom of storage tank.Because each chamber has corresponding connection in one indicating lamp.And pipe body is filled with brine, it itself can conduct electricity, so that indicating lamp can be connected to power supply.Because the lower end of pipe body is immersed in liquid nitrogen, the brine in its interior gradually freezes, so that the brine in these chambers gradually loses the ability to conduct electricity, in turn, the indicating lamp of these chambers corresponding is extinguished.Therefore, the liquid level height in storage tank can be directly judged by the bright situation of indicating lamp of display device placed outside.

[0004] But the device has the following defects when using: although the device can directly judge the liquid level height in storage tank by the cooperation of pipe body and indicating lamp, the height of liquid nitrogen tank has multiple specifications, if the height of liquid nitrogen tank is higher than pipe body, the upper end of pipe body cannot be exposed outside bottle body of liquid nitrogen tank, thereby causing the problems of inaccurate measurement and difficult to take out pipe body caused by pipe body inclination.Aiming at the above-mentioned defects: for this reason, we propose a kind of liquid nitrogen liquid level detection device. Utility model content

[0005] The utility model aims at solving the shortcomings in prior art, and proposes a kind of liquid nitrogen liquid level detection device.

[0006] In order to solve the problems existing in prior art, the utility model adopts the following technical scheme: a kind of liquid nitrogen liquid level detection device, comprising:

[0007] Liquid level rod, the liquid level rod includes base, fixed installation on the upper surface of base measuring rod, and the scale mark of setting on the surface of measuring rod;

[0008] The liquid nitrogen measuring structure comprises a first capacitive liquid level sensor, a second capacitive liquid level sensor and a fixing assembly arranged on the surfaces of the first capacitive liquid level sensor and the second capacitive liquid level sensor respectively.

[0009] The protection structure comprises a protection cover and a limiting assembly fixedly installed on the upper end of the measuring rod and capable of limiting the protection cover, and a guide frame is fixedly installed on the right side surface of the protection cover and communicates with the interior of the protection cover.

[0010] Preferably, the fixing assembly comprises two sleeves and two conical spring sleeves respectively sleeved on the surface of the measuring rod, a conical groove formed in the inner wall of the sleeve and a locking nut threadedly connected to the upper surface of the sleeve.

[0011] Preferably, the inner wall of the conical spring sleeve is matched with the surface of the measuring rod.

[0012] Preferably, the surfaces of the two sleeves are fixedly connected with the left ends of the first capacitive liquid level sensor and the second capacitive liquid level sensor respectively.

[0013] Preferably, the inner portion of the base is provided with a cavity, and a control unit is fixedly installed in the inner portion of the cavity and electrically connected with the first capacitive liquid level sensor and the second capacitive liquid level sensor through wires, and the surface of the measuring rod is provided with a strip-shaped groove for the wires to move.

[0014] Preferably, the upper surfaces of the first capacitive liquid level sensor and the second capacitive liquid level sensor are provided with a buzzer.

[0015] Preferably, the limiting assembly comprises a guide block fixedly installed on the upper end of the measuring rod, a groove formed in the surface of the guide block, a limiting pin slidingly installed in the inner wall of the groove and a limiting groove formed in the surface of the protection cover.

[0016] Preferably, the inner wall of the groove is provided with a compression spring capable of driving the limiting pin to be inserted into the inner wall of the limiting groove.

[0017] Compared with the prior art, the liquid nitrogen measuring structure has the following beneficial effects:

[0018] 1. By setting the liquid nitrogen measuring structure and the liquid level rod, placing the liquid level rod outside the liquid nitrogen cylinder, then placing the base on the ground, and moving the first capacitive liquid level sensor and the second capacitive liquid level sensor to the lowest and highest liquid levels of the liquid nitrogen cylinder respectively by using the fixing assembly, the lowest liquid level in the liquid nitrogen cylinder can be measured by the second capacitive liquid level sensor, so that it can be judged whether the liquid nitrogen in the liquid nitrogen cylinder is sufficient. Compared with the prior art, the device can directly measure the lowest and highest liquid levels of the liquid nitrogen in the liquid nitrogen cylinder outside the liquid nitrogen cylinder by using the first capacitive liquid level sensor and the second capacitive liquid level sensor, and the position of the first capacitive liquid level sensor and the second capacitive liquid level sensor on the measuring rod can be changed by using the fixing assembly, so that the height of the first capacitive liquid level sensor and the second capacitive liquid level sensor can be changed according to liquid nitrogen cylinders of different volumes and sizes. On the one hand, the problem of inaccurate measurement caused by the inclination of the pipe body due to the use of the pipe body in the liquid nitrogen cylinder in the prior art is avoided. On the other hand, the device is arranged outside the liquid nitrogen cylinder, so that the measurement and taking of the device are facilitated.

[0019] 2. By setting the protection structure, when the device is finished, the protection cover can be sleeved on the measuring rod at this time, the first capacitive liquid level sensor and the second capacitive liquid level sensor will enter the guide frame, the measuring rod will enter the protection cover, and the protection cover will be fixed by using the limiting assembly, so that the first capacitive liquid level sensor and the second capacitive liquid level sensor can be protected. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings described herein are used to provide further understanding of the present application, and the schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations. In the drawings:

[0021] Figure 1 It is a three-dimensional schematic view of the present application;

[0022] Figure 2 It is a three-dimensional schematic view of the protection cover of the present application;

[0023] Figure 3 It is a front sectional view of the base of the present application;

[0024] Figure 4 It is a front sectional view of the fixing assembly of the present application;

[0025] Figure 5 It is a front sectional view of the guide block of the present application.

[0026] The figure serial number: 10 base, 11 measuring rod, 12 scale mark, 20 first capacitive liquid level sensor, 21 second capacitive liquid level sensor, 22 buzzer, 30 protective cover, 31 guide frame, 40 sleeve, 41 conical spring sleeve, 42 locking nut, 50 control unit, 51 wire, 52 strip-shaped groove, 60 guide block, 61 limit pin, 62 limit groove, 63 compression spring. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model.

[0028] Please refer to Figures 1-5 The utility model provides a technical scheme: a liquid nitrogen liquid level detection device, include: liquid level rod, liquid nitrogen measurement structure and protection structure.

[0029] Refer to Figure 1 The liquid level rod includes a base 10, a measuring rod 11 fixedly installed on the upper surface of the base 10, and a scale mark 12 arranged on the surface of the measuring rod 11.

[0030] The liquid nitrogen measurement structure includes a first capacitive liquid level sensor 20, a second capacitive liquid level sensor 21, and a fixing assembly arranged on the surface of the first capacitive liquid level sensor 20 and the second capacitive liquid level sensor 21 respectively.

[0031] Refer to Figure 4 The fixing assembly includes two sleeves 40 and two conical spring sleeves 41 respectively sleeved on the surface of the measuring rod 11, a conical groove opened in the inner wall of the sleeve 40, and a locking nut 42 threadedly connected on the upper surface of the sleeve 40, the inner wall of the conical spring sleeve 41 is matched with the surface of the measuring rod 11, the conical spring sleeve 41 is put into the conical groove, and then the locking nut 42 is tightened, so that the conical spring sleeve 41 can be driven to shrink and clamp the measuring rod 11, and then the first capacitive liquid level sensor 20 and the second capacitive liquid level sensor 21 can be fixed on the surface of the measuring rod 11.

[0032] The surfaces of the two sleeves 40 are fixedly connected with the left ends of the first capacitive liquid level sensor 20 and the second capacitive liquid level sensor 21 respectively, and the upper surfaces of the first capacitive liquid level sensor 20 and the second capacitive liquid level sensor 21 are provided with a buzzer 22

[0033] Refer to Figure 3The inside of the base 10 is provided with a cavity, and a control unit 50 is fixedly installed in the cavity. The control unit 50 is electrically connected with the first capacitive liquid level sensor 20 and the second capacitive liquid level sensor 21 through wires 51. A strip-shaped groove 52 is formed in the surface of the measuring rod 11 for the wires 51 to move in. When the sliding sleeve 40 is moved, the wires 51 will slide along the inner wall of the strip-shaped groove 52.

[0034] After the first capacitive liquid level sensor 20 and the second capacitive liquid level sensor 21 are fixed on the surface of the measuring rod 11, the liquid level rod is placed outside the liquid nitrogen cylinder, and the base 10 is placed on the ground. At this time, the highest liquid level in the liquid nitrogen cylinder can be measured by the first capacitive liquid level sensor 20, and the lowest liquid level in the liquid nitrogen cylinder can be measured by the second capacitive liquid level sensor 21. When the first capacitive liquid level sensor 20 or the second capacitive liquid level sensor 21 senses that there is liquid nitrogen in the same plane of the liquid nitrogen cylinder, the buzzer 22 will alarm at this time, so that whether the liquid nitrogen cylinder is at the lowest liquid level can be determined by the first capacitive liquid level sensor 20, and overfilling of the liquid nitrogen can be avoided by the second capacitive liquid level sensor 21.

[0035] Compared with the prior art, the device can directly measure the lowest and highest positions of the liquid nitrogen in the liquid nitrogen cylinder outside the liquid nitrogen cylinder by using the first capacitive liquid level sensor 20 and the second capacitive liquid level sensor 21. The position of the first capacitive liquid level sensor 20 and the second capacitive liquid level sensor 21 on the measuring rod 11 can be changed by using the fixing assembly, so that the height of the first capacitive liquid level sensor 20 and the second capacitive liquid level sensor 21 can be changed according to liquid nitrogen cylinders of different volumes and sizes. On the one hand, the problem of inaccurate measurement caused by tilting of the pipe body in the prior art is avoided, and on the other hand, the device is arranged outside the liquid nitrogen cylinder, so that the measurement and taking of the device are facilitated.

[0036] Referring to Figure 2 and Figure 4 The protective structure comprises a protective cover 30 and a limiting assembly fixedly installed on the upper end of the measuring rod 11 and capable of limiting the protective cover 30. A guide frame 31 is fixedly installed on the right side of the protective cover 30, and the guide frame 31 and the inside of the protective cover 30 are in communication with each other.

[0037] The limiting assembly comprises a guide block 60 fixedly installed on the upper end of the measuring rod 11, a groove formed in the surface of the guide block 60, a limiting pin 61 slidingly installed in the inner wall of the groove, and a limiting groove 62 formed in the surface of the protective cover 30. The inner wall of the groove is provided with a compression spring 63 capable of driving the limiting pin 61 to insert into the inner wall of the limiting groove 62. When the limiting pin 61 is inserted into the limiting groove 62, the protective cover 30 is fixed on the guide block 60.

[0038] When the device is used, the protective cover 30 can be sleeved on the measuring rod 11, the first capacitive liquid level sensor 20 and the second capacitive liquid level sensor 21 can enter the guide frame 31, the measuring rod 11 can enter the protective cover 30, and the limiting assembly is used for fixing the protective cover 30, so that the first capacitive liquid level sensor 20 and the second capacitive liquid level sensor 21 can be protected.

[0039] The above merely provides the preferred embodiments of the present application, and the protection scope of the present application is not limited to this. Any person skilled in the art should be covered in the protection scope of the present application according to the technical scheme and the conception of the present application, which is equivalent to replacement or change.

Claims

1. A liquid nitrogen level detecting device, characterized by, The utility model relates to a liquid level measuring device for liquid nitrogen, which comprises a liquid level rod, a liquid nitrogen measuring structure and a protection structure. The liquid level rod comprises a base (10), a measuring rod (11) fixedly installed on the upper surface of the base (10), and scale marks (12) arranged on the surface of the measuring rod (11). The liquid nitrogen measuring structure comprises a first capacitive liquid level sensor (20), a second capacitive liquid level sensor (21), and a fixed assembly arranged on the surface of the first capacitive liquid level sensor (20) and the second capacitive liquid level sensor (21) respectively. The protection structure comprises a protective cover (30) and a limiting assembly fixedly installed on the upper end of the measuring rod (11) to limit the protective cover (30), and a guide frame (31) fixedly installed on the right side of the protective cover (30) and in communication with the interior of the protective cover (30).

2. The liquid nitrogen level detection device according to claim 1, characterized in that: The fixed assembly comprises two sleeves (40) and two conical spring sleeves (41) respectively sleeved on the surface of the measuring rod (11), a conical groove formed in the inner wall of the sleeve (40), and a locking nut (42) threadedly connected to the upper surface of the sleeve (40).

3. The liquid nitrogen level detection device of claim 2, wherein: The inner wall of the conical spring sleeve (41) is matched with the surface of the measuring rod (11).

4. The liquid nitrogen level detection device of claim 2, wherein: The surfaces of the two sleeves (40) are fixedly connected with the left ends of the first capacitive liquid level sensor (20) and the second capacitive liquid level sensor (21) respectively.

5. The liquid nitrogen level detection device of claim 1, wherein: The base (10) is internally provided with a cavity, and a control unit (50) is fixedly installed in the cavity.

6. The liquid nitrogen level detection device of claim 1, wherein: The upper surfaces of the first capacitive liquid level sensor (20) and the second capacitive liquid level sensor (21) are provided with a buzzer (22) respectively.

7. The liquid nitrogen level detection device of claim 1, wherein: The limiting assembly comprises a guide block (60) fixedly installed on the upper end of the measuring rod (11), a groove formed in the surface of the guide block (60), a limiting pin (61) slidingly installed in the inner wall of the groove, and a limiting groove (62) formed in the surface of the protective cover (30).

8. The liquid nitrogen level detection device of claim 7, wherein: The inner wall of the groove is provided with a compression spring (63) capable of driving the limiting pin (61) to be inserted into the inner wall of the limiting groove (62).

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