CN213148013U - Liquefied gas level detection device - Google Patents

Abstract

The utility model provides a liquid level detection device of liquefied gas, liquid level detection device of liquefied gas includes: the guide rail is arranged in the liquid tank and extends along the vertical direction; the annular magnet is sleeved outside the guide rail and moves up and down along the guide rail; the magnetic poles of the annular magnet are distributed inside and outside; the buoyancy piece is connected with the annular magnet; the magnetic sensor is disposed outside the liquid tank in the up-down direction. The utility model has the advantages of simple structure, accurate detection and the like.

Description

Liquefied gas level detection device

Technical Field

The utility model relates to a liquid level detection, in particular to liquid gas's liquid level detection device.

Background

At present, the liquid nitrogen capacity inspection schemes in a liquid nitrogen tank are divided into the following three types:

1. the method comprises the steps of taking a wooden stick with the length of 80cm, peeling, coating black, then setting a scale every 5cm from one end, inserting a zero scale downwards to the bottom of a liquid nitrogen tank from the opening of the tank during measurement, taking out the wooden stick after 5-10 s, wherein the frosted length is the liquid level of liquid nitrogen in the tank.

2. The weight measurement method comprises the steps of weighing the empty tank, weighing the tank filled with liquid nitrogen, subtracting the empty tank to obtain the total weight of the liquid nitrogen in the tank, and weighing the liquid nitrogen tank every 3-5 days later.

3. And (3) using a liquid level alarm, injecting liquid nitrogen into the liquid nitrogen tank, covering a cover plug as soon as possible, and plugging an ultrasonic liquid level measurement display device of the liquid nitrogen tank on the opening of the liquid nitrogen tank at intervals of 3-5 d later. The liquid level alarm device is started, the ultrasonic transmitter transmits ultrasonic beams to the surface of liquid nitrogen in the liquid nitrogen tank, the sound waves are reflected by the liquid nitrogen surface, partial reflection echoes are received by the ultrasonic receiver and are synchronously transmitted to ultrasonic echo signals in real time through the synchronous receiving circuit, and the single chip microcomputer calculates the propagation speed and time of the ultrasonic waves in the air to measure the liquid level height and displays the liquid level height in real time through the liquid crystal display. The main disadvantages of this approach are: the liquid level can not be obtained in real time, and the structure is complex and the cost is high; the liquid level alarm is determined to not work in real time due to the fact that electronic components cannot work for a long time due to the fact that the temperature in the liquid nitrogen tank is very low.

Disclosure of Invention

For solving not enough among the above-mentioned prior art scheme, the utility model provides a liquid level detection device of liquefied gas of real-time detection, simple structure, detection accuracy, good reliability.

The utility model aims at realizing through the following technical scheme:

a liquid level detection device for liquefied gas, the liquid level detection device for liquefied gas comprising:

the guide rail is arranged in the liquid tank and extends along the vertical direction;

the annular magnet is sleeved outside the guide rail and moves up and down along the guide rail; the magnetic poles of the annular magnet are distributed inside and outside;

the buoyancy piece is connected with the annular magnet;

and a magnetic sensor disposed outside the liquid tank in an up-down direction.

Compared with the prior art, the utility model discloses the beneficial effect who has does:

1. detecting in real time;

the annular magnet moves up and down along with the liquid level, and the height of the liquid level is accurately reflected; the annular magnet moving up and down causes the parameter change of the magnetic sensor outside the liquid tank, so that the position of the annular magnet is obtained in real time, namely the position of the liquid level is obtained in real time;

2. the structure is simple;

a guide rail and an annular magnet are additionally arranged in the liquid tank, and a magnetic sensor is arranged outside the tank;

3. the reliability is good;

electronic components do not need to be installed in the low-temperature tank, and only the guide rail and the annular magnet need to be installed, so that the reliability is obviously improved;

4. the detection result is accurate;

the magnetic force can accurately detect the position of the annular magnet, and the liquid level detection precision is improved.

Drawings

The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. In the figure:

fig. 1 is a schematic view of a liquefied gas level detection apparatus according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a magnet according to an embodiment of the present invention.

Detailed Description

Fig. 1-2 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of teaching the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or substitutions from these embodiments that will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.

Example 1:

fig. 1 schematically shows a schematic structural diagram of a liquefied gas level detection device according to embodiment 1 of the present invention, and as shown in fig. 1, the liquefied gas level detection device includes:

a guide rail 1, the guide rail 1 being disposed in the liquid tank 5 and extending in the up-down direction;

the annular magnet 21 is sleeved outside the guide rail 1, and moves up and down along the guide rail 1; the magnetic poles of the annular magnet 21 are distributed inside and outside;

the buoyancy member 22, the buoyancy member 22 is connected with the annular magnet 21;

the magnetic sensor 3 is arranged outside the liquid tank 5 along the up-down direction, the magnetic sensor is the prior art in the field, and the specific structure and the working mode are not described again.

In order to stably move the ring magnet up and down in position to improve the liquid level detection accuracy, as shown in fig. 2, the liquid level detection apparatus for liquefied gas further includes:

the guide piece 25 is arranged on the guide rail 1 in a sleeved mode, and moves up and down along the guide rail 1; the ring magnet 21 is fixedly connected to the guide 25 and the buoyancy member 22.

Further, as shown in fig. 2, the guide member 25, the buoyant member 22, and the ring magnet 21 are arranged in this order from the inside to the outside for the convenience of assembly and disassembly.

In order to adjust the buoyancy such that the ring magnet floats on the liquid surface to improve the liquid level detection accuracy, as shown in fig. 2, the liquid level detection apparatus for liquefied gas further includes:

and the counter weights 23 are uniformly arranged along the circumferential direction of the annular magnet 21 and are fixedly connected with the buoyancy member 22.

In order to improve the position stability of the ring magnet in the up-and-down movement, further, as shown in fig. 2, the weight 23 is disposed at the periphery of the buoyant member 22 and at the lower side of the ring magnet 21.

In order to improve the position stability of the ring magnet in the up-and-down movement, further, as shown in fig. 2, the buoyancy member 22 is a ring-shaped cavity.

In order to facilitate the up and down movement of the ring magnet and the stability of the neutral position, further, the magnetic force sensor 3 and the guide rail 1 are vertically disposed.

In order to improve the liquid level detection accuracy, further, the outer edge of the annular magnet 21 in the radial direction is an arc surface, and the outer edge of the annular magnet in the circumferential direction is annular.

In order to improve the liquid level detection accuracy, the guide rail 1 and the buoyancy element 22 are further made of non-magnetic materials.

Example 2:

according to the utility model discloses the application example of liquid level detection device of liquefied gas in the liquid nitrogen container.

In the application example, as shown in fig. 1-2, a vertical rod 1 is arranged in a liquid nitrogen tank 5; the inner wall of the guide 25 is matched with the vertical rod 1, sleeved outside the vertical rod 1 and stably moved up and down along the vertical rod 1; the periphery of the guide piece 25 is provided with a ring-shaped hollow buoy 22; the periphery of the annular hollow buoy 22 is provided with an annular magnet 21, and the radial outer edge of the annular magnet 21 is a cambered surface; the counterweight 23 is arranged on the periphery of the annular hollow floating body 22 and is positioned at the lower side of the annular magnet 21; the magnetic sensor 3 is vertically arranged at the outer side of the liquid nitrogen tank 5 and is adjacent to the vertical rod 1; the vertical rod 1, the guide piece 25, the buoy 22 and the counterweight 23 are made of non-magnetic materials.

Claims (10)

1. Liquefied gas's liquid level detection device, its characterized in that: the liquefied gas level detection device includes:

the guide rail is arranged in the liquid tank and extends along the vertical direction;

the annular magnet is sleeved outside the guide rail and moves up and down along the guide rail; the magnetic poles of the annular magnet are distributed inside and outside;

the buoyancy piece is connected with the annular magnet;

and a magnetic sensor disposed outside the liquid tank in an up-down direction.

2. The liquefied gas level detection apparatus according to claim 1, wherein: the liquefied gas level detection device further includes:

the guide piece is arranged on the guide rail in a sleeved mode and moves up and down along the guide rail; the annular magnet is fixedly connected with the guide piece and the buoyancy piece.

3. The liquefied gas level detection apparatus according to claim 2, wherein: from inside to outside, guide piece, buoyancy piece and ring magnet set gradually.

4. The liquefied gas level detection apparatus according to claim 1, wherein: the liquefied gas level detection device further includes:

and the counter weights are uniformly arranged along the circumferential direction of the annular magnet and are fixedly connected with the buoyancy piece.

5. The liquefied gas level detection apparatus according to claim 4, wherein: the counterweight is arranged on the periphery of the buoyancy piece and is positioned on the lower side of the annular magnet.

6. The liquefied gas level detection apparatus according to claim 1, wherein: the buoyancy member is an annular cavity.

7. The liquefied gas level detection apparatus according to claim 1, wherein: the magnetic sensor and the guide rail are vertically arranged.

8. The liquefied gas level detection apparatus according to claim 1, wherein: the liquefied gas is liquid nitrogen or liquid helium or liquid oxygen.

9. The liquefied gas level detection apparatus according to claim 1, wherein: the outer edge of the annular magnet in the radial direction is an arc surface, and the outer edge of the annular magnet in the circumferential direction is annular.

10. The liquefied gas level detection apparatus according to claim 1, wherein: the guide rail and the buoyancy piece are made of non-magnetic materials.

Images