KR102301284B1 - Level gauge sensor structure of fuel storage device - Google Patents

Abstract

The present invention relates to a level gauge sensor structure of a fuel storage device, which more precisely and accurately not only measures a capacity of fuel such as LNG by blocking electromagnetic waves introduced to the outside but also safely protects the sensor structure from vibration and an impact.

Description

Level gauge sensor structure of fuel storage device

The present invention relates to a level gauge sensor structure of a fuel storage device, which can measure the capacity of fuel such as LNG more precisely and accurately by blocking electromagnetic waves, etc. flowing to the outside, and can safely protect against vibration and shock It relates to a level gauge sensor structure of a fuel storage device.

Buses and trucks use diesel as the main fuel, and there are many old diesel vehicles, and the mileage and operation time are high, which causes high pollutant emissions, which adversely affects the air environment.

In addition to the supply of CNG (Compressed Natural Gas) vehicles, which started with low pollution and policies for buses and trucks to improve the atmospheric environment, LNG (Liquefied Natural Gas) vehicles that dramatically increase the mileage per charge This was developed.

Because LNG vehicles are charged in a liquid state, they have a greater fuel storage capacity than CNG vehicles, so the supply of long-distance express buses and trucks is expanding.

With the increase in the electronicization of automobiles and the increase in the use of various electric, electronic, and information communication products, measures against EMC (ElectroMagnetic Compatibility) have become necessary. EMC stands for EMS (EM Susceptibility/Immunity) that can operate normally even if it is affected by electromagnetic interference from the outside, with less EMI (ElectroMagnetic Interference/Emission) occurring to other devices by emitting at least unnecessary electromagnetic waves to the outside. /tolerance) is low or strong resistance.

Meanwhile, Patent Document 0001 (KR10-0917761B1, hereinafter referred to as 'Patent Document 0001') has been proposed in relation to a level gauge of an LNG fuel storage device.

The overcharge prevention device for an LNG fuel container of Patent Document 0001 includes a level gauge sensor installed obliquely along the radial direction on the circular cross-section of the main body to detect the level of fuel charged inside the cylindrical body in which the fuel is filled, A float that maintains the same level as the LNG level of the body and moves along the longitudinal direction of the level gauge sensor according to the level of the LNG is inserted inside the level gauge sensor, and when the float is in contact, a detection signal is generated to the control unit A terminal is coupled to an end of the level gauge sensor to transmit, and the level gauge sensor is installed at an angle such that both ends thereof are positioned between the lower limit level and the upper limit level of the LNG in the body.

The advantage of overcharging prevention device for LNG fuel container in Patent Document 0001 is to prevent overcharge of fuel without installing a separate tank to form a reduction space, thereby reducing the weight of the fuel container, reducing cost, and increasing the reliability of the overcharge prevention device There is this.

However, since the level gauge sensor is coupled to the LNG fuel storage device, there is a limitation in accurately measuring the level when amplifying and detecting a minute signal for a fuel level change from an electromagnetic wave coming from the outside.

KR10-0917761B1 (2009.09.09)

The present invention for solving such conventional problems is a fuel storage device that can not only measure the capacity of fuel such as LNG more precisely and accurately, but also safely protect it from vibration and shock by blocking electromagnetic waves, etc. flowing to the outside. The purpose is to provide a level gauge sensor structure of

The present invention for achieving the above object,

A conductive inner tube that is installed with an upper end and a lower end insulated inside a fuel storage device in which fuel including LNG is charged, and a state that the upper end and lower end are insulated inside the fuel storage device in a state where the inner tube is accommodated A sensor body including a spiral cable installed as a; a capacitance detecting unit for detecting a capacitance between the inner tube and the spiral cable; It provides a level gauge sensor structure of the fuel storage device comprising a; a level calculation unit for calculating the level of the fuel charged in the fuel storage device based on the detected value detected by the capacitance detection unit.

Here, an overcharge contact electrically connected to the spiral cable and disposed in the upper space of the inner tube body; an over-discharge contact electrically connected to the spiral cable and disposed in a lower space of the inner tube body; It is preferable that a conductive float accommodated in the inner tube body to move upward when fuel is overcharged to contact the overcharge contact and move downward to contact the overdischarge contact when fuel is overdischarged.

In addition, it is preferable that the level calculating unit determines an overcharge or overdischarge state based on a detection value detected by the capacitance detecting unit in which the conductive float changes in contact with the overcharge or overdischarge contact.

Furthermore, a lower insulating finish provided at the lower end of the inner tube body; It is preferable that an upper insulating finish portion provided at the upper end of the inner tube body is provided.

In addition, the overcharge contact is electrically connected to the spiral cable, and is disposed to be exposed at a predetermined height into the upper space of the inner tube through a through hole formed in the upper insulating closure part, and the overdischarge contact is the spiral cable It is preferable that the upper end portion is exposed at a predetermined height into the lower space of the inner tube body through a through hole formed in the lower insulating finishing portion.

In addition, it is preferable that the overcharge contact and the overdischarge contact have a tubular structure penetrating up and down.

In addition, it is preferable that the sensor body be provided with a conductive shielding tube that is installed in a state electrically connected to the inside of the fuel storage device in a state of accommodating the spiral cable to shield electromagnetic waves.

Here, an overcharge contact electrically connected to the spiral cable and disposed in the upper space of the inner tube body; an overdischarge contact electrically connected to the conductive shielding tube and disposed in a lower space of the inner tube; It is preferable that a conductive float accommodated in the inner tube body to move upward when fuel is overcharged to contact the overcharge contact and move downward to contact the overdischarge contact when fuel is overdischarged.

The level gauge sensor structure of the fuel storage device of the present invention detects the capacitance according to the level of the fuel introduced into the space between the inner tube of the sensor body and the spiral cable by the capacitance detection unit, and determines the level of the fuel by the level operation unit. Since it can be accurately calculated and measured, there is an effect of accurately measuring the capacity of fuel such as LNG.

Furthermore, the amount of change in capacitance can be increased through the long spiral cable in the vertical direction, so that the capacitance according to the fuel level can be more precisely detected by the capacitance detection unit, and the internal tube body from vibration and shock It has the effect of safely protecting and shielding the tube body.

In addition, as the sensor body is provided with a conductive shielding tube installed in a state of being electrically connected to the inside of the fuel storage device in a state that accommodates the spiral cable, it is possible to effectively shield electromagnetic waves flowing to the outside, so that the capacity of fuel such as LNG can be accurately measured.

1 is a cross-sectional view schematically showing an installation state of a level gauge sensor structure of a fuel storage device according to an embodiment of the present invention;
2 is a perspective view schematically showing a level gauge sensor structure of a fuel storage device according to an embodiment of the present invention;
Figure 3 is an exploded perspective view of Figure 2,
4 is a cross-sectional view taken along line A - A of FIG. 2,
5 is a cross-sectional view taken along line B - B of FIG. 2,
Figure 6 is an exploded cross-sectional view of Figure 5,
7 is a plan view schematically showing another example of the upper insulating finish,
8 is a plan view schematically showing another example of the upper insulating finishing part,
9 is a bottom view schematically showing another example of the lower insulating finishing part,
10 is a cross-sectional view schematically illustrating a state in which a conductive float is in contact with an overcharge contact;
11 is a cross-sectional view schematically showing a state in which a conductive float is in contact with an overdischarge contact;
12 is a block diagram schematically showing a control state of a control unit;
13 is a flowchart schematically illustrating a level calculation process of fuel charged in a fuel storage device;
14 is a perspective view schematically showing a level gauge sensor structure of a fuel storage device according to another embodiment of the present invention;
15 is an exploded perspective view of FIG. 14;
16 is a cross-sectional view taken along line C - C of FIG. 14 .

Hereinafter, an embodiment of the level gauge sensor structure of the fuel storage device of the present invention will be described in detail with reference to the drawings, and the scope of the present invention is not limited to the following embodiments.

1 is a cross-sectional view schematically showing an installation state of a level gauge sensor structure of a fuel storage device according to an embodiment of the present invention.

The structure of the level gauge sensor of the fuel storage device according to an embodiment of the present invention largely includes a sensor body 10 , a capacitance detecting unit 20 , and a level calculating unit 30 .

First, as shown in FIG. 1 , the sensor body 10 may be vertically installed inside the fuel storage device 3 in which various types of fuels including LNG are filled.

The fuel storage device 3 may be electrically connected to a vehicle battery and the like through a wire cable.

Figure 2 is a perspective view schematically showing a level gauge sensor structure of a fuel storage device according to an embodiment of the present invention, Figure 3 is an exploded perspective view of Figure 2, Figure 4 is a cross-sectional view taken along line A - A of Figure 2, Figure 5 is a cross-sectional view taken along line B - B of FIG. 2 , and FIG. 6 is an exploded cross-sectional view of FIG. 5 .

As shown in FIGS. 2 to 6 , the sensor body 10 is configured to include a conductive inner tube body 110 and a spiral cable 120 .

The conductive inner tube 110 may be vertically installed inside the fuel storage device 3 while the upper end and the lower end of the conductive inner tube 110 are insulated.

The conductive inner tube body 110 may be accommodated inside the spiral cable 120 .

The spiral cable 120 may be vertically installed inside the fuel storage device 3 with the upper end and the lower end of the spiral cable 120 insulated.

The conductive inner tube 110 may be connected to an electrode.

As the water level of various types of fuel including LNG charged in the fuel storage device 3 increases, the capacitance between the conductive inner tube 110 and the spiral cable 120 may gradually increase.

As the water level of various types of fuel including LNG charged in the fuel storage device 3 decreases, the capacitance between the conductive inner tube 110 and the spiral cable 120 may gradually decrease. .

Next, the capacitance detection unit may detect the capacitance between the conductive inner tube body 110 and the spiral cable 120 .

The capacitance detection unit is not shown in the drawings, but for example, various types such as a capacitance sensor IC that can be electrically connected to the conductive inner tube body 110 and the spiral cable 120 by various methods such as wire cables, etc. can be made with

Next, the level calculator may calculate the level of the fuel charged in the fuel storage device 3 , that is, the fuel level, based on the detection value detected by the capacitance detector.

For example, when the capacitance detection value detected by the capacitance detection unit is equal to or less than the reference capacitance detection value preset in the control unit, the level calculation unit under the control of the control unit includes the LNG inside the fuel storage device 3 . It can be calculated that the level of various types of fuel is low.

When the capacitance detection value detected by the capacitance detection unit exceeds the reference capacitance detection value preset in the control unit, the level calculation unit under the control of the control unit includes various types of LNG inside the fuel storage device 3 . It can be calculated that the fuel level of

Although not shown in the drawing, a notification unit for notifying the amount of fuel stored in the fuel storage device 3 to a vehicle driver or the like based on the calculated value of the level calculation unit may be further provided.

The notification unit may be formed of various types such as any one or both of a light emitting member such as an LED that emits light and an alarm sound output member such as a speaker that outputs an alarm sound.

When the level calculation unit calculates that the fuel level is low, the light emitting member and the alarm sound output member of the notification unit may each receive power from the power supply unit to emit light and output an alarm sound under the control of the control unit. .

When the level calculation unit calculates that the fuel level is high, the notification unit may be stopped under the control of the control unit.

Next, as another example, the capacitance between the conductive inner tube body 110 and the spiral cable 120 can be detected through the overcharge contact 40 , the overdischarge contact 50 and the conductive float 60 . have.

The overcharge contact 40 , the overdischarge contact 50 , and the conductive float 60 may be made of various materials such as metal.

The overcharging contact 40 and the overdischarging contact 50 may have a vertical penetrating tubular structure.

In order for the overcharge contact 40 to be electrically connected to the spiral cable 120, the upper portion of the overcharge contact 40 of the tubular structure penetrating up and down is connected to the upper end of the spiral cable 120 The upper connecting plate 410 may be vertically eccentric around the center of the upper connecting plate 410 made of various materials such as metal.

A groove 411 that is horizontally depressed to a predetermined depth may be formed on one side, the other side, the front side, and the rear side of the upper connection plate 410 .

For example, the overcharge contact 40 of a tube structure in which each corner of the upper connection plate 410 is connected and fixed in various ways such as soldering and fixing to the conductor of the upper part of the spiral cable 120 vertically through the top and bottom. may be vertically disposed in the upper space of the conductive inner tube body 110 .

In order for the over-discharge contact 50 to be electrically connected to the spiral cable 120, the lower end of the spiral cable 120 is located on the outer surface of the lower end of the over-discharge contact 50 of the tube structure that penetrates up and down. The lower connection plate 510 of various materials, such as a metal material connected to the , may be formed horizontally.

At one side, the other side, the front side, and the rear side of the lower connecting plate 510 , a groove 511 that is horizontally depressed to a predetermined depth may be formed inside the lower connecting plate 510 .

As an example, the over-discharge contact point of a tube structure in which each upper corner of the lower connection plate 510 is connected and fixed in various ways such as soldering and fixing to the conductor of the lower part of the spiral cable 120 and penetrating up and down ( 50) may be vertically disposed in the lower space of the conductive inner tube body 110 .

The conductive float 60 is vertically accommodated inside the conductive inner tube 110 and moves upwards of the conductive inner tube 110 when the fuel is overcharged, and may be in contact with the lower portion of the overcharge contact 40 .

The conductive float 60 may move to a lower side of the conductive inner tube 110 when the fuel is over-discharged and may come into contact with an upper portion of the over-discharge contact 50 .

In order to keep the conductive float 60 easily in contact with the inner surface of the conductive inner tube 110 during the elevating process of the conductive float 60, the conductive float 60 has an outer peripheral surface in the middle of the conductive surface. An annular protrusion member 601 may be formed that horizontally protrudes in the direction of the inner surface of the inner tube 110 by a predetermined length and contacts the inner surface of the conductive inner tube 110 .

Next, a lower insulating closing part 70 and an upper insulating closing part 80 may be provided.

The lower insulating closure part 70 and the upper insulating closure part 80 may be formed of various types, for example, the conductive inner tube body 110 and the spiral cable inside the fuel storage device 3 . Polytetrafluoroethylene (PTFE), a non-flammable fluororesin, in order to allow the 120 to be vertically disposed in an insulated state and to normally detect the level of fuel inside the fuel storage device 3 even at cryogenic temperatures. can be made with

The lower insulating closing part 70 may be provided between the lower end of the conductive inner tube 110 and the lower end of the spiral cable 120 .

The lower insulating closing part 70, for example, may be configured to include, for example, a lower insertion fixed body 701 having an annular shape, and a lower closing fixed body 702 having an annular shape.

The lower insertion fixed body 701 may be inserted and fixed in various ways, such as forcing and fixing the lower inner side of the conductive inner tube body 110 .

The lower closing fixed body 702 may be formed in the lower portion of the lower insertion fixed body 701, and the outer diameter size of the lower closing fixed body 702 is larger than the outer diameter size of the lower insert fixed body 701. can be formed.

A through hole 710 may be vertically formed in the middle portion of the lower insulating finishing portion 70 .

A plurality of auxiliary through-holes 711 may be formed at regular intervals in a radial shape in the portion of the lower insulating closing portion 70 around the through-hole 710 of the lower insulating finishing portion 70 .

The upper insulating closing part 80 may be provided between the upper end of the conductive inner tube 110 and the upper end of the spiral cable 120 .

The upper insulating closure part 80, for example, may be configured to include, for example, an upper insertion fixed body 801 having an annular shape and an upper closure fixed body 802 having an annular shape.

The upper insertion fixed body 801 may be inserted and fixed in various ways, such as forcing and fixing the upper inner side of the conductive inner tube body 110 .

The upper closing fixed body 802 may be formed on the upper part of the upper inserting fixed body 801, and the outer diameter of the upper closing fixed body 802 is greater than the outer diameter of the upper inserted and fixed body 801. can be formed.

A through hole 810 may be vertically formed in an eccentric state in the upper finished insulating portion 80 having an annular shape.

And, as an example, as shown in FIG. 5 , a plurality of auxiliary through-holes 820 may be formed at regular intervals in a radial shape at the edge portion of the upper finished fixing body 802 of the upper finished insulating part 80 .

The gas inside the conductive inner tube body 110 may pass through the inside of the overcharge contact 40 of the tube structure having a vertical penetration, and may be discharged into the fuel storage device 3 .

The overcharge contact 40 of the tubular structure penetrating up and down is inserted and fixed in various ways, such as forcibly and fixed in the through hole 810 vertically formed eccentrically on the upper insulating closure part 80, and the overcharge contact 40 ) may be drawn into the upper space of the conductive inner tube 110 by a predetermined length, and thereby the lower portion of the overcharge contact 40 is exposed at a predetermined height in the upper space of the conductive inner tube 110 state can be placed.

The over-discharge contact 50 of the tube structure penetrating up and down is inserted and fixed in various ways, such as press fit and fixed to the through-hole 710 of the lower insulating closure part 70, and the upper portion of the over-discharge contact 50 may be introduced into the lower space of the conductive inner tube 110 by a predetermined length, and thereby the upper portion of the over-discharge contact 50 is exposed at a predetermined height in the lower space of the conductive inner tube 110 . can be placed.

7 is a plan view schematically showing another example of an upper insulating finishing part.

As another example, the through-hole 810 of the upper insulating finishing part 80 may include a first through-hole 811 and a second through-hole 812 as shown in FIG. 7 .

The first through hole 811 may be formed in the form of a groove horizontally recessed to a predetermined depth inward of the upper insulating closing part 80 from one side, the other side, the front side, and the rear side of the upper insulating closing part 80 . .

The second through hole 811 may be eccentrically formed in a circular shape in a portion of the upper insulating closing part 80 around the center of the upper insulating closing part 80 .

The overcharge contact 40 of the tube structure that penetrates vertically may vertically penetrate the second through hole 811 of the through hole 810 of the upper insulating closure part 80 of another example.

8 is a plan view schematically showing another example of the upper insulating finishing part.

As another example, on one side, the other side, the front side, and the rear side of the upper insulating closing part 80, as shown in FIG. 810 may be formed respectively.

The overcharge contact 40 of the tube structure that penetrates vertically may penetrate vertically through any one of the groove-shaped through holes 810 of the upper insulating closure part 80 of another example.

9 is a bottom view schematically showing another example of the lower insulating finishing part.

As another example, on one side, the other side, the front side, and the rear side of the lower insulating closing part 70, as shown in FIG. 711 may be formed respectively.

10 is a cross-sectional view schematically illustrating a state in which a conductive float is in contact with an overcharge contact.

The fuel 2 charged in the fuel storage device 3 includes the groove 511 of the lower connection plate 510 horizontally formed on the outer surface of the lower end of the over-discharge contact 50 of the tubular structure penetrating up and down and the It may sequentially pass through the auxiliary through-holes 711 of the lower insulating finishing part 70 and flow into the inside of the conductive inner tube 110, and thereby, the conductive float 60 as shown in FIG. It may gradually rise upwards of the conductive inner tube 110 .

11 is a cross-sectional view schematically illustrating a state in which a conductive float is in contact with an overdischarge contact.

When the level of the fuel 2 gradually decreases due to the consumption of the fuel 2 inside the fuel storage device 3, the conductive float 60 forms the conductive inner tube body ( 10) can be gradually descended to the lower side.

12 is a block diagram schematically showing a control state of a control unit.

The level calculation unit 30 controls the conductive float 60 on the basis of the detection value detected by the capacitance detection unit 20 in which the conductive float 60 is changed in contact with the overcharge contact 40 or the overdischarge contact 50. 31), it is possible to determine an overcharge or overdischarge state by receiving power from the power supply unit 31 .

13 is a flowchart schematically illustrating a level calculation process of fuel charged in a fuel storage device.

For example, as shown in FIG. 10 , when the conductive float 60 rises and comes into contact with the lower end of the overcharge contact 40, a short occurs and a change in the increasing capacitance value occurs and the capacitance detection unit 20 ) can detect this.

At this time, as shown in FIG. 13 , the level calculator 30 may determine that the fuel 2 is overcharged in the fuel storage device 3 due to a short circuit in a state where the capacitance value is equal to or greater than the upper limit.

In addition, under the control of the control unit 31, the light emitting member of the notification unit may flicker or the alarm sound output member of the notification unit may output an overcharge notification such as 'overcharge'.

And, as shown in FIG. 11 , when the conductive float 60 descends and comes into contact with the upper end of the over-discharge contact 50, a short occurs and a change in the decreasing capacitance value occurs and the capacitance detecting unit 20 ) can detect this.

At this time, as shown in FIG. 12 , the level calculator 30 may determine that the fuel 2 is overdischarged in the fuel storage device 3 due to a short circuit in a state where the capacitance value is below the lower limit.

In addition, under the control of the control unit 31, the light emitting member of the notification unit may be turned on or the alarm sound output member of the notification unit may output an over-discharge notification message such as 'over-discharge'.

As described above, the capacitance detecting unit 20 measures the capacitance according to the level of the fuel 2 introduced into the space between the conductive inner tube 110 of the sensor body 10 and the spiral cable 120 . ) and can accurately calculate and measure the level of the fuel 2 by the level calculating unit 30, there is an advantage in that the capacity of fuel such as LNG can be accurately measured.

Furthermore, the amount of change in capacitance can be increased through the long spiral cable 120 in the vertical direction, so that the capacitance according to the level of the fuel 2 can be more precisely detected by the capacitance detecting unit 20 . Not only that, there is an effect of safely protecting the conductive inner tube 110 and the conductive shielding tube 130 to be described later from vibration and shock.

14 is a perspective view schematically illustrating a level gauge sensor structure of a fuel storage device according to another embodiment of the present invention, FIG. 15 is an exploded perspective view of FIG. 14 , and FIG. 16 is a cross-sectional view taken along line C - C of FIG. 14 .

Next, as shown in FIGS. 14 to 16 , the sensor body 10 may further include a conductive shielding tube 130 .

In a state where the spiral cable 120 is accommodated inside the conductive shielding tube 130, the conductive shielding tube 130 is electrically connected to the inside of the fuel storage device 3 to shield electromagnetic waves and block noise. can

The upper portion of the conductive shielding tube body 130 may be electrically connected and fixed to the upper inner surface of the fuel storage device 3 in various ways such as welding and fixing.

The lower portion of the conductive shielding tube body 130 may be electrically connected and fixed to the lower outer surface of the fuel storage device 3 in various ways such as welding and fixing.

In order for the overdischarge contact 50 to be electrically connected to the conductive shielding tube body 130 , each corner portion of the lower connection plate 510 of the overdischarge contact 50 is the conductive shielding tube body 130 . It can be connected to the lower inner surface in various ways, such as welding and fixing.

One inlet 131 or a plurality of inlet 131 may be radially formed at regular intervals on the lower outer surface of the conductive shielding tube body 130 .

The fuel 2 inside the fuel storage device 3 includes the inlet 131 of the conductive shielding tube 130 , the groove 511 of the lower connection plate 510 of the overdischarge contact 50 , and the lower portion of the fuel storage device 3 . It may sequentially pass through the auxiliary through-holes 711 of the insulating closure part 70 and flow into the interior of the conductive inner tube body 110 .

One outlet 132 or a plurality of outlets 132 may be radially formed at regular intervals on the upper outer surface of the conductive shielding tube body 130 .

The gas inside the conductive inner tube 110 is the inside of the overcharge contact 40 of the tube structure that penetrates up and down, the auxiliary through hole 820 of the upper finished insulating part 80, and the conductive shielding tube 130 It may be discharged into the interior of the fuel storage device 3 through the outlet 132 of the.

Since electromagnetic waves and noise can be effectively shielded through the conductive shielding tube 130 , there is an advantage in that the capacity of the fuel 2 such as LNG can be measured more accurately.

3; fuel storage system, 10; sensor body,
110; conductive inner tube body, 120; cable,
20; capacitance detection unit, 30; level calculator.

Claims (8)

A conductive inner tube that is installed with an upper end and a lower end insulated inside a fuel storage device in which fuel including LNG is charged, and a state that the upper end and lower end are insulated inside the fuel storage device in a state where the inner tube is accommodated A sensor body including a spiral cable installed as a;
a capacitance detecting unit for detecting a capacitance between the inner tube and the spiral cable;
and a level calculator for calculating the level of the fuel charged in the fuel storage device based on the detection value detected by the capacitance detector.
The method of claim 1,
an overcharge contact electrically connected to the spiral cable and disposed in an upper space of the inner tube body; an over-discharge contact electrically connected to the spiral cable and disposed in a lower space of the inner tube body; A conductive float accommodated in the inner tube and moved upwards to contact the overcharge contact when the fuel is overcharged, and moves downward to contact the overdischarge contact when the fuel is overdischarged; sensor structure.
3. The method of claim 2,
The level calculation unit determines the overcharge or overdischarge state based on the detection value detected by the capacitance detection unit in which the conductive float is changed in contact with the overcharge contact or the overdischarge contact Level of the fuel storage device, characterized in that The sensor structure of the gauge.
3. The method of claim 2,
a lower insulating finish provided at the lower end of the inner tube; The level gauge sensor structure of the fuel storage device, characterized in that;;
5. The method of claim 4,
The overcharge contact is electrically connected to the spiral cable, and is disposed to be exposed at a predetermined height into the upper space of the inner tube body through a through hole formed in the upper insulating closure part,
The overdischarge contact is electrically connected to the spiral cable, and the upper end is exposed at a predetermined height into the lower space of the inner tube through a through hole formed in the lower insulating closure level. Gauge sensor structure.
6. The method of claim 5,
The level gauge sensor structure of the fuel storage device, characterized in that the overcharge contact and the overdischarge contact are formed of a tube structure penetrating up and down.
The method of claim 1,
The level gauge sensor structure of the fuel storage device, characterized in that the sensor body is provided with a conductive shielding tube that is installed in a state electrically connected to the inside of the fuel storage device in a state of accommodating the spiral cable to shield electromagnetic waves.
8. The method of claim 7,
an overcharge contact electrically connected to the spiral cable and disposed in an upper space of the inner tube body; an overdischarge contact electrically connected to the conductive shielding tube and disposed in a lower space of the inner tube; A conductive float accommodated in the inner tube and moved upwards to contact the overcharge contact when the fuel is overcharged, and moves downward to contact the overdischarge contact when the fuel is overdischarged; sensor structure.

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