CN211203645U - Liquefied petroleum gas steel cylinder liquid level measuring device based on thermal principle - Google Patents

Abstract

The utility model discloses a liquid level measuring device for a liquefied petroleum gas cylinder based on a thermal principle, which relates to the technical field of liquefied petroleum gas devices, and comprises a cylinder, a control device, a plurality of thermistors, a packaging device, an LED lamp, an electric heating element and a PCB circuit board, thermistor, electric heating element, PCB circuit board and LED lamp are packaged in the packaging device, the packaging device can be detachably fixed on the surface of the cylinder; the control device includes a housing, a battery and a microprocessor, the microprocessor and the battery It is fixed in the housing; the microprocessor is electrically connected with the PCB circuit board, and there are multiple resistors on the PCB circuit board. The battery is electrically connected, and the microprocessor is electrically connected to the battery; a plurality of thermistors are distributed at intervals along the vertical direction of the cylinder, and the electric heating element is parallel to the straight line where the plurality of thermistors are located. The utility model can visually see the liquid level height of the liquefied petroleum gas in the steel cylinder.

Description

A liquid level measuring device for liquefied petroleum gas cylinders based on thermal principles

technical field

The utility model relates to the technical field of liquefied petroleum gas devices, in particular to a liquid level measuring device of a liquefied petroleum gas cylinder based on thermal principles.

Background technique

As a clean energy, LPG is used as an important fuel in residential, commercial and industrial places. LPG is generally carried in special steel cylinders. Since the cylinders are non-transparent materials, the gas remaining in the cylinders cannot be directly observed. It was discovered that the liquefied petroleum gas was exhausted when it could not be ignited, and the gas volume could not be known in advance, thus affecting the user's use.

In the prior art, a scale is usually installed at the bottom to measure the weight of the cylinder, and the remaining gas in the cylinder is calculated. This method increases the height and floor space of the cylinder, which causes a lot of inconvenience to users.

Therefore, a new liquid level measuring device for LPG cylinders is urgently needed in the market to solve the above problems.

Utility model content

The purpose of this utility model is to provide a liquid level measuring device of LPG cylinder based on thermal principle, which is used to solve the technical problems existing in the above-mentioned prior art, and can intuitively see the remaining amount of LPG in the cylinder.

For achieving the above object, the utility model provides the following scheme:

The utility model discloses a liquid level measuring device for a liquefied petroleum gas cylinder based on a thermal principle, comprising a cylinder, a control device, a plurality of thermistors, a packaging device, a plurality of LED lamps, an electric heating element and a PCB circuit board. The thermistor, the electric heating element, the PCB circuit board and the LED lamp are packaged in the package device, the control device is fixed on the package device, and the package device is detachably fixed to the package device cylinder surface;

The control device includes a casing, a battery and a microprocessor, and the microprocessor and the battery are fixed in the casing;

The microprocessor is electrically connected to the PCB circuit board, and there are a plurality of resistors on the PCB circuit board. The LED lamp is electrically connected, the electric heating element is electrically connected with the battery, and the microprocessor is electrically connected with the battery;

A plurality of the thermistors are distributed at intervals along the vertical direction of the cylinder, the number of the LED lights and the thermistors are the same, and the plurality of the LED lights and the thermistors are in one-to-one correspondence in the horizontal direction , the electric heating element is parallel to the straight line where the plurality of thermistors are located.

Preferably, it also includes two soft magnetic sheets, the two soft magnetic sheets are packaged in the packaging device, and the two soft magnetic sheets are located on both sides of the packaging device.

Preferably, it also includes a chip, and the chip is electrically connected to the microprocessor.

Preferably, the electric heating element includes a heating box body and an electric heating wire, the electric heating wire is located in the heating box body, one end of the electric heating wire is electrically connected to the battery, and the electric heating wire is connected to a plurality of the heating elements. The lines on which the varistor is located are parallel.

Preferably, the encapsulation means are two films.

Preferably, the thermistor is a negative temperature coefficient thermistor.

The utility model has achieved the following technical effects with respect to the prior art:

The utility model judges the liquid level height of the liquefied petroleum gas in the steel cylinder through the difference of the temperature of the gas and the liquid in the steel cylinder and the temperature change rate. In addition, the device of the utility model has a small volume and saves space.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only of the present invention. For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the structural schematic diagram of the liquid level measuring device of the liquefied petroleum gas cylinder based on the thermal principle of the present embodiment;

In the figure: 1-chip; 2-microprocessor; 3-electric heating element; 4-battery; 5-film; 6-LED lamp; 7-thermistor; 8-soft magnetic sheet.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The purpose of this utility model is to provide a liquid level measuring device of LPG cylinder based on thermal principle, which is used to solve the technical problems existing in the above-mentioned prior art, and can intuitively see the remaining amount of LPG in the cylinder.

In order to make the above objects, features and advantages of the present utility model more clearly understood, the present utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1 , this embodiment provides a liquid level measurement device for LPG cylinders based on thermal principles, including a cylinder, a control device, a plurality of thermistors 7 , a packaging device 5 , an LED lamp 6 , and an electric heating element 3 and the PCB circuit board. The thermistor 7 , the electric heating element 3 , the PCB circuit board and the LED lamp 6 are encapsulated in the encapsulation device 5 , and the encapsulation device is made of transparent material, which is convenient for observation. The control device is glued to the outer surface of the encapsulation device 5 by means of glue. The packaging device 5 is detachably fixed on the surface of the steel cylinder, and can be easily disassembled as required.

The control device includes a casing, a battery 4 and a microprocessor 2, and the microprocessor 2 and the battery 4 are fixed in the casing.

The microprocessor 2 is electrically connected to the PCB circuit board. There are multiple resistors on the PCB circuit board. The multiple resistors are electrically connected to the multiple thermistors 7 respectively. After the thermistor 7 is connected in series with the resistors on the PCB circuit board, The electrical signal is passed to the microprocessor 2 . The resistor on the PCB is used to read the voltage value, and the microprocessor 2 is used to convert the electrical signal into a digital signal and process it. The microprocessor 2 is electrically connected to the LED lamp 6, and the resistance exclusion in the microprocessor 2 is connected in series with the LED lamp 6 to effectively avoid the problem of burning the LED lamp 6 due to excessive current. The electric heating element 3 is electrically connected with the battery 4, and the electric heating element 3 can heat the liquefied petroleum gas in the cylinder. The microprocessor 2 is electrically connected with the battery 4 , and the microprocessor 2 controls the battery 4 to heat the electric heating element 3 .

A plurality of thermistors 7 are distributed at intervals along the vertical direction of the cylinder. The height of the thermistors 7 represents the height of the liquid level in the cylinder. The specific number of thermistors 7 is set according to actual needs. The number of LED lights 6 and thermistors 7 are the same, and the plurality of LED lights 6 correspond to the plurality of thermistors 7 in a one-to-one horizontal direction. The purpose of the LED lights 6 is to facilitate the user to intuitively see the current liquid level height. The electric heating element 3 is parallel to the straight line where the plurality of thermistors 7 are located, and the purpose of this setting is to uniformly heat the steel cylinder.

During use, when the cylinder has been used continuously for a period of time, the liquid temperature is lower than that of the gas in the cylinder due to the vaporization and heat absorption of the liquid in the cylinder. The current liquid level can be known by reading the voltage value on the thermistor 7. If the cylinder has been out of use for a period of time at this time, and the temperature of the gas and liquid in the cylinder is the same, the electric heating element 3 is activated to uniformly heat the outer wall of the cylinder. In the process of heat conduction to the thermistor 7, part of the heat is taken away by the liquefied petroleum gas in the cylinder by thermal convection. Compared with the LPG in the gas phase, the LPG in the liquid phase conducts heat faster and takes more heat, so the LPG in the gas phase takes away less heat from the cylinder, and the thermistor 7 measures the cylinder. Therefore, the temperature of the thermistor 7 located in the gas phase part rises faster. The microprocessor 2 calculates the resistance change rate of each thermistor 7 by continuously measuring the voltage value on the thermistor 7 . Then, by comparing the resistance change rate of each thermistor 7, the current liquid level in the cylinder can be obtained by interpolation calculation. After the liquid level is obtained, the microcontroller turns on the LED light 6 on the liquid level, so that the setting can intuitively prompt the user the current gas volume.

In order to facilitate the fixing of the encapsulation device 5 on the outer wall of the steel cylinder, the present embodiment also includes two soft magnetic sheets 8 . side. In this way, both sides of the packaging device 5 can be adsorbed on the outer wall of the steel cylinder, thereby realizing the fixing and removal of the packaging device 5 .

In this embodiment, a chip 1 is also included, and the chip 1 is electrically connected with the microprocessor 2 . In this way, the data in the microprocessor 2 can be transferred to the server. The chip 1 is the NB-IoT chip 1, and those skilled in the art can also use other chips 1 according to actual needs, as long as the data of the microprocessor 2 can be transmitted to the server.

The conventional electric heating element 3 is an electric heating wire. When the electric heating wire is in direct contact with the packaging device 5, an accident is likely to occur. In order to solve this problem, in this embodiment, the electric heating element 3 includes a heating box and an electric heating wire, the electric heating wire is located in the heating box, the heating box is a copper container, one end of the electric heating wire is electrically connected to the battery 4, and the electric heating wire is The lines on which the thermistors 7 are located are parallel. When in use, the negative pressure steam is poured into the heating box, and the negative pressure steam in the heating box is heated by the electric heating wire, and then the heat of the negative pressure steam is transferred to the heating box by thermal convection, so as to be transferred into the cylinder. This can effectively avoid accidents.

Further, in this embodiment, the packaging device 5 is two films. The film on the side close to the cylinder is a thermally conductive film, and the film on the side away from the cylinder is a plastic film, which can quickly transfer the external heat to the thermistor 7 .

The thermistor 7 in this embodiment is a negative temperature coefficient thermistor 7 . Those skilled in the art can also use the positive temperature coefficient thermistor 7 or other thermistors 7, as long as the resistance value can change with the regularity according to the temperature change.

In this specification, specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention; meanwhile, for those of ordinary skill in the art, According to the idea of the present invention, there will be changes in the specific implementation and application scope. In conclusion, the content of this specification should not be construed as a limitation on the present invention.

Claims (6)

1. a liquefied petroleum gas cylinder liquid level measuring device based on thermal principle, is characterized in that: comprise cylinder, control device, a plurality of thermistors, packaging device, LED lamp, electric heating element and PCB circuit board, described thermal The varistor, the electric heating element, the PCB circuit board and the LED lamp are encapsulated in the encapsulation device, the control device is fixed on the encapsulation device, and the encapsulation device is detachably fixed on the steel cylinder surface; The control device includes a casing, a battery and a microprocessor, and the microprocessor and the battery are fixed in the casing; The microprocessor is electrically connected to the PCB circuit board, and there are a plurality of resistors on the PCB circuit board. The LED lamp is electrically connected, the electric heating element is electrically connected with the battery, and the microprocessor is electrically connected with the battery; A plurality of the thermistors are distributed at intervals along the vertical direction of the cylinder, the number of the LED lights and the thermistors are the same, and the plurality of the LED lights and the thermistors are in one-to-one correspondence in the horizontal direction , the electric heating element is parallel to the straight line where the plurality of thermistors are located. 2. The liquefied petroleum gas cylinder liquid level measuring device based on thermal principle according to claim 1, characterized in that: it also comprises two soft magnetic sheets, and the two soft magnetic sheets are packaged in the packaging device, and the two Each of the soft magnetic sheets is located on both sides of the packaging device. 3 . The liquid level measuring device for LPG cylinders based on thermal principles according to claim 1 , further comprising a chip, which is electrically connected to the microprocessor. 4 . 4. The LPG cylinder liquid level measuring device based on thermal principle according to claim 1, wherein the electric heating element comprises a heating box body and an electric heating wire, and the electric heating wire is located in the heating box body, One end of the heating wire is electrically connected to the battery, and the heating wire is parallel to the straight line where the plurality of thermistors are located. 5 . The liquid level measuring device for LPG cylinders based on thermal principles according to claim 1 , wherein the packaging device is two thin films. 6 . 6 . The LPG cylinder liquid level measuring device based on the thermal principle according to claim 1 , wherein the thermistor is a negative temperature coefficient thermistor. 7 .

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