CN212721640U

CN212721640U - Liquefied gas temp. difference level meter

Info

Publication number: CN212721640U
Application number: CN202021574989.4U
Authority: CN
Inventors: 蔡延彬; 刘剑桢; 吕浩; 张夏; 朱华强; 冯永康; 李朝; 赖学良; 杨中志
Original assignee: Guangdong Institute Of Special Equipment Inspection And Research Dongguan Branch
Current assignee: Guangdong Institute Of Special Equipment Inspection And Research Dongguan Branch
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-03-16
Anticipated expiration: 2030-07-31

Abstract

The utility model belongs to the technical field of liquid level meters, in particular to a liquefied gas temperature difference liquid level meter, which comprises an installation rod and a plurality of temperature sensors; when in use, one end of the mounting rod positioned in the low-temperature liquid is taken as the lower end, and the other end positioned outside the low-temperature liquid is taken as the upper end; the plurality of temperature sensors are spirally wound on the outer wall of the mounting rod from bottom to top, and the side parts of two adjacent temperature sensors are closely attached or have mounting gaps; therefore, the installation of two adjacent temperature sensors in the longitudinal space of the installation rod cannot interfere, so that the longitudinal distance between the detection ends of the two adjacent temperature sensors can be set between 0mm and 10 mm; the operator can set up the longitudinal distance between two adjacent temperature sensor's the sense terminal into very little numerical value for when the difference in temperature between one of them set of two adjacent temperature sensor exists obvious sudden change, can reachd the liquid level height of liquefied gas more accurately, and then make liquefied gas temperature difference level gauge measuring error is little, and measurement accuracy is high.

Description

Liquefied gas temp. difference level meter

Technical Field

The utility model belongs to the technical field of the level gauge, especially, relate to a liquefied gas difference in temperature level gauge.

Background

The low-temperature liquid level sensor is used for measuring the liquid level height of low-temperature liquid such as liquid nitrogen, plays an important role in low-temperature testing, and is an essential instrument for ensuring normal running of scientific research tests, industrial production and other processes.

At present, there are many methods for measuring the level of cryogenic liquid, mainly including a thermal oscillation method, a super conductor method, a resistance method, a diode method, a capacitance method, and the like. In all the above methods, the purpose of determining the liquid level height is achieved by using the difference between the internal and external electric conductivity or thermal conductivity or resistance and capacitance of the low-temperature liquid, and the defects are as follows: since the above-described characteristic differences on both sides of the liquid critical surface are limited, it is difficult to make a greater breakthrough in the liquid level side measurement accuracy regardless of how the sensor itself is changed. In order to solve the above defects, the chinese patent discloses a low temperature liquid level sensor assembly with application number CN201120352180.1, when in use, one end of the sensor assembly is located inside the low temperature liquid, and the other end is located outside the low temperature liquid, the sensor assembly comprises a support rod, a plurality of temperature sensors and a plurality of signal transmission lines; with when the sensor module used the one end that the bracing piece is located low temperature liquid is the lower extreme, is located the outer one end of low temperature liquid and is the upper end, temperature sensor from bottom to top distribute in proper order in the surface of bracing piece, temperature sensor's signal output part with the one end one-to-one of signal transmission line is connected, signal transmission line's the other end is followed from bottom to top the bracing piece is drawn forth. The temperature sensor can transmit a temperature difference signal indicating whether the liquid is soaked to the central processing unit through the signal transmission line, and the central processing unit can judge the height of the liquid level very accurately according to the position of the temperature sensor. The liquid level height is judged by utilizing the temperature difference of the low-temperature liquid medium in the gas state and the liquid state, so the error is quite small, the precision is very high, and the method is a great progress in the field of low-temperature liquid level measurement.

However, the disclosed low-temperature liquid level sensor assembly has the following defects: the temperature sensor consists of a detection end and a mounting seat, and the detection end is mounted on the mounting seat. The volume of the mounting seat is larger than that of the detection end. Temperature sensor from bottom to top distributes in the mode of setting up in the surface of bracing piece in proper order, even the mount pad of two adjacent temperature sensor is adjacent to set up in the surface of bracing piece, because the mount pad installation can occupy a part space, make still have great longitudinal distance between two adjacent temperature sensor's the sense terminal, and longitudinal distance is littleer between two adjacent temperature sensor's the sense terminal, it is higher that measurement accuracy is high, consequently, the measurement accuracy who leads to current low temperature level sensor subassembly can't further promote, there is certain limitation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a liquefied gas difference in temperature level gauge aims at solving the unable further promotion of measurement accuracy of current low temperature level sensor subassembly among the prior art, has the technical problem of certain limitation.

In order to achieve the above object, an embodiment of the present invention provides a liquefied gas level gauge, which includes a mounting rod and a plurality of temperature sensors; when in use, one end of the mounting rod positioned in the low-temperature liquid is taken as the lower end, and the other end positioned outside the low-temperature liquid is taken as the upper end; the temperature sensors are spirally wound on the outer wall of the mounting rod from bottom to top, and the side parts of the two adjacent temperature sensors are tightly attached to each other or have mounting gaps.

Optionally, the longitudinal distance between the detection ends of two adjacent temperature sensors is 0mm to 10 mm.

Optionally, a data interface is arranged at the top of the mounting rod; the temperature sensor comprises a signal transmission line; the temperature sensors are electrically connected with the data interface through signal transmission lines.

Optionally, the temperature sensor further comprises a mounting plate; the mounting seat of the temperature sensor is fixedly arranged on the mounting plate, and the mounting plate is arranged on the outer wall of the mounting rod, so that the detection end of the temperature sensor is perpendicular to the surface of the outer wall of the mounting rod.

Optionally, the mounting rod is a hollow rod, a plurality of strip-shaped grooves longitudinally distributed are arranged on the outer wall of the mounting rod in a penetrating manner, and each strip-shaped groove is arranged corresponding to one temperature sensor; the liquefied gas temperature difference liquid level meter also comprises an adjusting component; the adjusting assembly comprises a bolt and a nut; the screw rod of the bolt is movably connected with the strip-shaped groove, and the nut of the bolt is limited in the mounting rod by the strip-shaped groove; the mounting plate is provided with a mounting hole in a penetrating manner, and the mounting hole is in fit sleeve joint with a screw rod of the bolt; the nut is in threaded connection with the screw rod of the bolt, and the nut is screwed down so that the mounting plate is fixed to the strip-shaped groove through the bolt.

Optionally, a notch is formed in the outer wall of the mounting rod at the top or the bottom of the strip-shaped groove, and the notch is larger than the nut of the bolt.

Optionally, the signal transmission line passes through the strip-shaped groove and is electrically connected with the data interface along the inside of the mounting rod.

Optionally, the temperature sensor is a platinum resistance temperature sensor.

Optionally, a bottle mouth sealing piece is further arranged at the upper end of the mounting rod, and the bottle mouth sealing piece is located above the temperature sensor.

Optionally, the material of the bottle mouth sealing element is silica gel or rubber.

Compared with the prior art, the utility model discloses a liquefied gas difference in temperature level gauge has one of following technological effect: the temperature sensors are spirally wound on the outer wall of the mounting rod from bottom to top, and the side parts of two adjacent temperature sensors are closely attached or have mounting gaps; therefore, the installation of two adjacent temperature sensors in the longitudinal space of the installation rod cannot interfere, so that the longitudinal distance between the detection ends of two adjacent temperature sensors can be set within the range of 0 mm-10 mm; the operator can be with adjacent two longitudinal distance between temperature sensor's the sense terminal sets up to very little numerical value, receives environmental factor to influence littlely for one of them is a set of adjacent two when there is obvious sudden change in the difference in temperature between the temperature sensor, can reach the liquid level height of liquefied gas more accurately, and then make liquefied gas difference in temperature level meter measuring error is little, and measurement accuracy is high.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is the structure schematic diagram of the liquefied gas temperature difference liquid level meter of the utility model.

Fig. 2 is the partial structure decomposition schematic diagram of the liquefied gas temperature difference liquid level meter of the utility model.

Fig. 3 is the structure schematic diagram of the temperature sensor of the liquefied gas temperature difference liquid level meter of the utility model.

Wherein, in the figures, the respective reference numerals:

the mounting rod 100, the data interface 110, the strip-shaped groove 120, the notch 130, the bottleneck sealing element 140, the temperature sensor 200, the detection end 210, the mounting seat 220, the mounting plate 240, the adjusting assembly 300, the bolt 310, the screw 311, the nut 312 and the nut 320.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary and intended to explain the embodiments of the present invention and are not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which is only for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the present disclosure, referring to fig. 1 and 2, a liquefied gas level gauge is provided, including a mounting rod 100 and a plurality of temperature sensors 200.

In use, referring to fig. 1, 2 and 3, the end of the mounting rod 100 located inside the cryogenic liquid is taken as the lower end, and the end located outside the cryogenic liquid is taken as the upper end. The plurality of temperature sensors 200 are spirally wound on the outer wall of the mounting rod 100 from bottom to top, and the side portions of two adjacent temperature sensors 200 are tightly attached to each other or have a mounting gap. Therefore, the installation of two adjacent temperature sensors 200 in the longitudinal space of the installation rod 100 does not interfere, so that the longitudinal distance between the detection ends 210 of two adjacent temperature sensors 200 can be set within the range of 0mm to 10 mm.

When the liquefied gas temperature difference liquid level meter is used, the mounting rod 100 vertically extends into cryogenic liquid, and the plurality of temperature sensors 200 are electrically connected with a display instrument (not shown) through transmission lines (not shown), so that the temperature of the position where each temperature sensor 200 is detected is transmitted to the display instrument. According to cryogenic liquid medium there is the temperature sudden change at the critical surface of two kinds of states of gas, liquid, cryogenic liquid medium has obvious temperature difference in the critical surface of two kinds of states of gas, liquid promptly, consequently, the utility model discloses a each the temperature that temperature sensor 200 feedbacks back reachs one of them set of adjacent two there is obvious difference in temperature to judge the liquid level position of low temperature liquefied gas between the temperature sensor 200, and the error is little, and the precision is high.

Compared with the prior art, the utility model discloses a liquefied gas difference in temperature level gauge has one of following technological effect: the operator can be with adjacent two longitudinal distance between temperature sensor 200's the sense terminal 210 sets up very little numerical value to make one of them a set of adjacent two when there is obvious sudden change in the difference in temperature between temperature sensor 200, can reach the liquid level height of liquefied gas more accurately, and then make liquefied gas difference in temperature level meter measuring error is little, and measurement accuracy is high.

Referring to fig. 1, 2 and 3, the longitudinal distance between the detection ends 210 of two adjacent temperature sensors 200 is 0mm to 10mm, and in the application, the value of the distance between the detection ends 210 of two adjacent temperature sensors 200 is determined according to the actually required measurement accuracy or according to the difference of the measured low-temperature liquefied gas. The smaller the longitudinal distance between the detection ends 210 of two adjacent temperature sensors 200 is, the smaller the influence of environmental factors is, the smaller the measurement error of the liquefied gas temperature difference liquid level meter is, and the higher the measurement precision is.

Referring to fig. 1, 2 and 3, the top of the mounting bar 100 is provided with a data interface 110. The temperature sensor 200 includes a signal transmission line (not shown). The temperature sensors 200 are all electrically connected with the data interface 110 through signal transmission lines. The data interface 110 is electrically connected with the display instrument through a transmission line to realize data transmission, so that the wiring of workers is convenient.

Wherein, the liquid level of liquefied gas is in adjacent two in the interval between temperature sensor 200's the detection end 210, when the liquid level of liquefied gas is in the different positions in this interval, adjacent two temperature difference numerical value between temperature sensor 200 also can be different, consequently, the staff all can collect numerical value in the test phase, be about to this interval evenly divide into a plurality of points, then the position that makes the liquid level of liquefied gas be in each point time respectively tests, reachs adjacent two that this interval point position corresponds with it temperature difference numerical value distribution table between temperature sensor 200, consequently when liquefied gas temperature difference level gauge uses, according to above-mentioned temperature difference numerical value distribution table, just can accurately reachd the liquid level position of liquefied gas.

Referring to fig. 1, 2 and 3, the temperature sensor 200 further includes a mounting plate 240. The mounting seat 220 of the temperature sensor 200 is fixedly mounted on the mounting plate 240, and the mounting plate 240 is mounted on the outer wall of the mounting rod 100, so that the detection end 210 of the temperature sensor 200 is perpendicular to the outer wall surface of the mounting rod, the mounting is firm, and the test is accurate.

Referring to fig. 1, 2 and 3, the mounting rod 100 is a hollow rod, a plurality of strip-shaped grooves 120 longitudinally distributed are formed in the outer wall of the mounting rod 100 in a penetrating manner, and each strip-shaped groove 120 corresponds to one temperature sensor 200. The liquefied gas temperature difference liquid level meter further comprises an adjusting assembly 300.

Referring to fig. 1, 2 and 3, the adjustment assembly 300 includes a bolt 310 and a nut 320. The screw 311 of the bolt 310 is movably connected to the strip-shaped groove 120, and the nut 312 of the bolt 310 is limited in the mounting rod 100 by the strip-shaped groove 120, that is, the nut 312 of the bolt 310 cannot be pulled out of the strip-shaped groove 120, so that the screw 311 of the bolt 310 can move up and down along the strip-shaped groove 120. The mounting plate 240 is provided with a mounting hole (not shown) through it, and the mounting hole is adapted to be sleeved on the screw 311 of the bolt 310. The nut 320 is screwed to the screw 311 of the bolt 310, and the nut 320 is tightened to fix the mounting plate 240 to the bar groove 120 by the bolt 310. The specific operation is as follows: loosen nut 320, portable mounting panel 240 and bolt 310 follow strip groove 120 shifts up or moves down, adjusts adjacent two when longitudinal distance between temperature sensor 200's the sense terminal 210 is for setting for numerical value, screws up nut 320 makes temperature sensor 200's mount pad 220 and the outer wall butt of installation pole 100, and nut 312 of bolt 310 and the inner wall butt of installation pole 100 can be fixed temperature sensor 200, and it is convenient to adjust, connects stably simultaneously.

Referring to fig. 1, 2 and 3, a notch 130 is formed in the top or bottom of the strip-shaped groove 120 on the outer wall of the mounting rod 100, and the notch 130 is larger than the nut 312 of the bolt 310, so that the nut 312 of the bolt 310 can conveniently penetrate through the notch 130, and the screw 311 of the bolt 310 can be conveniently installed in the strip-shaped groove 120.

Referring to fig. 1, 2 and 3, signal transmission line passes bar groove 120 and follows installation pole 100 is inside with data interface 110 electricity is connected, avoids signal transmission line set up in the outer wall of installation pole 100 appears the confusion phenomenon, and signal transmission line sets up inside installation pole 100 simultaneously, makes liquefied gas temperature difference level gauge's compact structure, succinct.

The temperature sensor 200 is a platinum resistance temperature sensor. The platinum resistance temperature sensor is mature in the prior art, the platinum resistance temperature sensor measures temperature by utilizing the characteristic that the resistance value of metal platinum changes along with the change of the temperature, and a display instrument can indicate the temperature value corresponding to the resistance value of the platinum resistance. Meanwhile, the platinum resistance temperature sensor is the most accurate and stable temperature sensor, and the linearity of the platinum resistance temperature sensor is superior to that of a thermocouple and a thermistor.

Referring to fig. 1, 2 and 3, a mouthpiece seal 140 is further provided at an upper end of the mounting rod 100, and the mouthpiece seal 140 is located above the temperature sensor 200. Bottleneck sealing member 140's material is silica gel or rubber, through bottleneck sealing member 140 plugs up the bottleneck of low-temperature liquid, realizes that the bottleneck is sealed, convenient operation.

The display apparatus (not shown) is a mature prior art, so the structure and the working principle of the present invention are not repeated herein.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of the ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, its framework form can be nimble changeable, can derive series of products. But merely as a matter of simple deductions or substitutions, should be considered as belonging to the scope of patent protection of the present invention as determined by the claims submitted.

Claims

1. The liquefied gas temperature difference liquid level meter is characterized by comprising a mounting rod and a plurality of temperature sensors; when in use, one end of the mounting rod positioned in the low-temperature liquid is taken as the lower end, and the other end positioned outside the low-temperature liquid is taken as the upper end; the temperature sensors are spirally wound on the outer wall of the mounting rod from bottom to top, and the side parts of the two adjacent temperature sensors are tightly attached to each other or have mounting gaps.

2. The liquefied gas temperature difference level gauge according to claim 1, wherein: the longitudinal distance between the detection ends of two adjacent temperature sensors is 0-10 mm.

3. The liquefied gas temperature difference level gauge according to claim 1, wherein: the top of the mounting rod is provided with a data interface; the temperature sensor comprises a signal transmission line; the temperature sensors are electrically connected with the data interface through signal transmission lines.

4. The liquefied gas temperature difference level gauge according to claim 3, wherein: the temperature sensor also comprises an installation plate; the mounting seat of the temperature sensor is fixedly arranged on the mounting plate, and the mounting plate is arranged on the outer wall of the mounting rod, so that the detection end of the temperature sensor is perpendicular to the surface of the outer wall of the mounting rod.

5. The liquefied gas temperature difference level gauge according to claim 4, wherein: the mounting rod is a hollow rod, a plurality of strip-shaped grooves which are longitudinally distributed penetrate through the outer wall of the mounting rod, and each strip-shaped groove is arranged corresponding to one temperature sensor; the liquefied gas temperature difference liquid level meter also comprises an adjusting component; the adjusting assembly comprises a bolt and a nut; the screw rod of the bolt is movably connected with the strip-shaped groove, and the nut of the bolt is limited in the mounting rod by the strip-shaped groove; the mounting plate is provided with a mounting hole in a penetrating manner, and the mounting hole is in fit sleeve joint with a screw rod of the bolt; the nut is in threaded connection with the screw rod of the bolt, and the nut is screwed down so that the mounting plate is fixed to the strip-shaped groove through the bolt.

6. The liquefied gas temperature difference level gauge according to claim 5, wherein: the outer wall of the mounting rod is provided with a notch at the top or the bottom of the strip-shaped groove, and the notch is larger than the nut of the bolt.

7. The liquefied gas temperature difference level gauge according to claim 5, wherein: the signal transmission line passes through the strip-shaped groove and is electrically connected with the data interface along the inside of the mounting rod.

8. The liquefied gas temperature difference level gauge according to any one of claims 1 to 7, wherein: the temperature sensor is a platinum resistance temperature sensor.

9. The liquefied gas temperature difference level gauge according to any one of claims 1 to 7, wherein: the upper end of the mounting rod is further provided with a bottle mouth sealing piece, and the bottle mouth sealing piece is located above the temperature sensor.

10. The liquefied gas temperature difference level gauge according to claim 9, wherein: the material of bottleneck sealing member is silica gel or rubber.