CN203376025U

CN203376025U - LNG gas cylinder double-cable double-capacitor self-adaption sensor

Info

Publication number: CN203376025U
Application number: CN201320313432.9U
Authority: CN
Inventors: 应林爱; 徐雪峰
Original assignee: YONGKANG LANXUELONG INTELLIGENT SCIENCE & TECHNOLOGY Co Ltd
Current assignee: YONGKANG LANXUELONG INTELLIGENT SCIENCE & TECHNOLOGY Co Ltd
Priority date: 2013-05-31
Filing date: 2013-05-31
Publication date: 2014-01-01
Anticipated expiration: 2023-05-31

Abstract

An LNG gas cylinder double-cable double-capacitor self-adaption sensor comprises an outer tube and an inner tube installed in the outer tube, and the inner tube comprises an upper inner tube and a lower inner tube. The upper inner tube is connected with the lower inner tube through an insulating part which is concentric with the outer tube. The lower inner tube and the outer tube form a comparison capacitor and the upper inner tube and the outer tube form a measurement capacitor. The upper inner tube and the lower inner tube are respectively connected with a coaxial shield cable, and shielding layers of the coaxial shield cables are connected to the outer tube. The LNG gas cylinder double-cable double-capacitor self-adaption sensor has the advantages that manual zero scale calibration and full scale calibration are not needed, and working efficiency is improved. Due to the fact that the zero scale calibration and full scale calibration of the liquid level are automatically achieved, changes of a liquid dielectric constant are not correlated with a measurement result, and measurement precision is improved. The LNG gas cylinder double-cable double-capacitor self-adaption sensor is easier to use and operate for a user and beneficial to promoting LNG clean energy to be popularized and applied widely.

Description

A kind of LNG gas cylinder two-wire double-capacitance self-adapted sensor

Technical field

The utility model relates to a kind of LNG gas cylinder two-wire double-capacitance self-adapted sensor.

Background technology

According to the direction of international energy development, adapt to the development strategy of China's clean energy resource, liquefied natural gas (LNG) (LNG) will become first-selected New-type fuel, vehicle-mounted LNG gas cylinder by spread to replace traditional gasoline or diesel tank.Similar with fuel tanks of automobile, the LNG gas cylinder also needs the amount of liquefied gas in a content gauge indication gas cylinder.For measuring the capacitance level gauge of LNG liquid level, be all the single-capacitor type sensor adopted at present.The liquid level gauge that this single-capacitor type sensor forms need to manually carry out zero graduation and full scale calibration, thereby also just needs zero graduation and the full scale capacitance of manual measurement LNG gas cylinder in advance, and to gas cylinder, production brings great inconvenience for this.On the other hand, find in practice that rock gas constituent and the place of production are closely related, and this single-capacitor type sensor can not be eliminated the measuring error that this kind brings due to LNG liquid source difference.

Summary of the invention

The purpose of this utility model is to provide the automatic calibration of level gauging in a kind of LNG of realization gas cylinder and the LNG gas cylinder two-wire double-capacitance self-adapted sensor of the different change in dielectric constant that cause in self-adaptation LNG liquid source.

For reaching the goal of the invention the technical solution adopted in the utility model, be:

A kind of LNG gas cylinder two-wire double-capacitance self-adapted sensor, comprise urceolus and inner core within it is installed, it is characterized in that: described inner core comprises inner core and lower inner core, between described upper inner core and lower inner core, by the insulating part concentric with urceolus, be connected, described lower inner core and urceolus form the contrast capacitor, described upper inner core and urceolus form measures capacitor, on described upper and lower inner core, is connected with respectively coaxial shielded cable, and the screen layer of described coaxial shielded cable is connected on urceolus.

Further, the two ends of described urceolus are provided with support member, are equipped with the insulation tetrafluoro part that inner core and urceolus is insulated and support inner core between described support member and upper inner core, lower inner core, and described insulation tetrafluoro part is concentric with urceolus.

Further, described urceolus lower end is provided with a plurality of inlet openings, and described upper inner core upper end is provided with venthole a plurality of and inlet opening formation convection current.Inlet opening and venthole form convection current and can make can not produce pressure between sensor urceolus and inner core, prevent that impurity from being entered between urceolus and inner core by upper end simultaneously.

During the utility model work, owing to measuring capacitor and contrast capacitor, and the effect of coaxial shielded cable, the learning process that liquid level gauge can change by a liquid level easily, realize zero graduation and the full scale calibration of liquid level automatically.After this calibration process completes, measurement result can be irrelevant with the specific inductive capacity of liquid medium, eliminated LNG liquid source and changed the impact on measurement result.

The beneficial effects of the utility model are: do not need manually to carry out zero graduation and full scale calibration, improved work efficiency.Due to the zero graduation of automatically realizing liquid level and full scale calibration, liquid dielectric is changed with measurement result irrelevant, therefore improved measuring accuracy.The user uses and operates simplyr, is conducive to promote the on a large scale universal and application of LNG clean energy resource.

The accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Fig. 2 is that the utility model is along A-A in Fig. 1 to cut-open view.

Embodiment

Below in conjunction with specific embodiment, the utility model is further described, but the utility model is not confined to these embodiments.One skilled in the art would recognize that the utility model contained all alternativess, improvement project and the equivalents that may comprise in claims scope.

With reference to Fig. 1, Fig. 2, a kind of LNG gas cylinder two-wire double-capacitance self-adapted sensor, comprise urceolus 1 and inner core within it is installed, described inner core comprises inner core 2 and lower inner core 3, between described upper inner core 2 and lower inner core 3, by the insulating part 4 concentric with urceolus 1, be connected, described lower inner core 3 forms the contrast capacitor with urceolus 1, described upper inner core 2 forms and measures capacitor with urceolus 1, be connected with respectively coaxial shielded cable on described upper inner core 2, lower inner core 3, the screen layer of described coaxial shielded cable is connected on urceolus 1.

The two ends of described urceolus 1 are provided with support member 5, are equipped with the insulation tetrafluoro part 6 that inner core and urceolus 1 is insulated and support inner core between described support member 5 and upper inner core 2, lower inner core 3, and described insulation tetrafluoro part 6 is concentric with urceolus 1.

Described urceolus 1 lower end is provided with a plurality of inlet openings, and described upper inner core 2 upper ends are provided with venthole a plurality of and inlet opening formation convection current.Inlet opening and venthole form convection current and can make can not produce pressure between sensor urceolus 1 and inner core, prevent that impurity from being entered between urceolus 1 and inner core by upper end simultaneously.

Claims

1. a LNG gas cylinder two-wire double-capacitance self-adapted sensor, comprise urceolus and inner core within it is installed, it is characterized in that: described inner core comprises inner core and lower inner core, between described upper inner core and lower inner core, by the insulating part concentric with urceolus, be connected, described lower inner core and urceolus form the contrast capacitor, described upper inner core and urceolus form measures capacitor, on described upper and lower inner core, is connected with respectively coaxial shielded cable, and the screen layer of described coaxial shielded cable is connected on urceolus.

2. a kind of LNG gas cylinder two-wire double-capacitance self-adapted sensor according to claim 1, it is characterized in that: the two ends of described urceolus are provided with support member, be equipped with the insulation tetrafluoro part that inner core and urceolus is insulated and support inner core between described support member and upper inner core, lower inner core, described insulation tetrafluoro part is concentric with urceolus.

3. a kind of LNG gas cylinder two-wire double-capacitance self-adapted sensor according to claim 1 and 2, it is characterized in that: described urceolus lower end is provided with a plurality of inlet openings, and described upper inner core upper end is provided with the venthole that a plurality of and inlet opening form convection current.