KR100261895B1 - Liquid level sensing device of fuel tank - Google Patents

Abstract

PURPOSE: A device for detecting liquid level of a fuel tank is provided to exactly measure a flow amount by rotating a shaft and a rotating pin while float attached on a spiral coil moves vertically according to a height of oil level after a shaft on which the spiral coil is wound is rotatably mounted in the fuel tank. CONSTITUTION: A device for detecting liquid level of the fuel tank includes a shaft(32) having a lower end rotatably mounted on a shaft supporting plate(30) attached to a fuel tank(2) and an upper end rotatably supported by a fixing plate(42) by interposing a guide rail(44), a spiral coil(34) having a lower end fixed on the shaft supporting plate and an upper end fixed on the shaft to be adjacent to the lower end of the fixing plate, a float(36) vertically moving along the spiral coil according to a height of oil level, a rotor(60) fixed to the upper end of the shaft, rotating on the fixing plate integrally and having a spiral hole(60a) on which a resistance wire(62) is wound and a first terminal(47) attached to the upper end, and a guide(46) having a second terminal(48) fixed to an end of a contact plate for maintaining a contacted state with the resistance wire and performing a vertically sliding movement along the guide rail.

Description

Liquid level detector for fuel tank

The present invention relates to a liquid level detection device for a fuel tank, and more particularly, to a rotatably mounted shaft in which a spiral coil is wound in a fuel tank, and then the float attached to the spiral coil moves up and down along the height of the oil surface. The present invention relates to a fuel tank liquid level detection device capable of accurately measuring a flow rate by rotating a shaft while rotating a shaft.

The oil tank where water or various fluids are stored is equipped with a measuring device that enables the operation of the mechanical equipment continuously by accurately measuring the remaining amount of fluid remaining to predict the oil replenishment time. Such oil tanks include not only industrial water tanks and various oil tanks, but also fuel tanks for automobiles commonly used in real life, and most of these tanks are provided with a flow rate measuring device for measuring and displaying the current flow rate.

In particular, when driving a car, the fuel in the fuel tank is all exhausted, so it is often difficult to run because it is difficult to install, in order to prevent the vehicle fuel tank to install a liquid level detection device of various types of fuel tank. The liquid level detection device of such a fuel tank includes a coil resistance type that converts a variable variable through contact with a float moving up and down along the oil surface and outputs it in the form of voltage, or a contact pressure is proportional to an energization time flowing through a heating wire. Since the use of a bimetal type using a change, a conventional bimetallic fuel measuring device will be described with reference to the accompanying Figure 1 in order to help the understanding of the present invention.

1 is a block diagram illustrating a flow rate measuring apparatus of an oil tank according to the prior art, in which an upper portion of the fuel tank 2 is mounted with a sensor unit 20, and a lower portion of the sensor unit 20 is fitted with a bracket. The bracket is provided with a lever 8 that rotates around the pin 6, and a float 10 that moves up and down along the oil surface is provided at the end of the lever 8. In addition, the sensor unit 20 is provided with a fixed iron piece on which a heating wire is wound, and a contact point 14 is attached to one end of the fixed iron piece. The contact 14 is always in contact with the contact arm 12 connected with the bracket.

In order to display the fuel amount according to the change in the contact pressure between the contact arm 12 and the contact 14, an armature 28 is provided in the fuel gauge 22, and a hot wire is wound around the armature 28.

Therefore, when the key switch 18 is turned on, electricity is supplied to the armature 28 through the hot wire. In this state, when the oil level in the fuel tank 2 is changed, the float 10 moves up and down, thereby changing the contact pressure between the contact arm 12 and the contact 14. That is, when the fuel is consumed a lot and the remaining amount is small, the float 10 is lowered, so that the contact pressure of the sensor unit 20 becomes weak and the energization time flowing through the hot wire is shortened, so that the voltage flowing to the armature 28 is also reduced. . Therefore, the instructions 24 in the fuel gauge 22 connected with the armature 28 will point to E (Exhausted).

On the contrary, when there is a lot of fuel, the float 10 rises and the contact pressure increases, so that the energization time through the hot wire also becomes long, and the guide 24 in the fuel gauge 22 is F (Full) around the pin 26. ).

In the liquid level detection apparatus of the conventional fuel tank having such a configuration, since the float is lowered in proportion to the consumption of the fuel, the remaining fuel amount is measured by the rotation angle of the contact arm. The disadvantage is that it does not exhibit a constant fuel consumption.

In order to solve this problem, the present invention is rotatably mounted to the shaft is wound spiral coil in the fuel tank, the float attached to the spiral coil is moved up and down according to the height of the oil surface to rotate the shaft It is an object of the present invention to provide a fuel tank liquid level detection device capable of accurately measuring a flow rate by rotating a rotary pin.

1 is a block diagram showing a liquid level detection device of a conventional fuel tank.

2 is a block diagram showing an apparatus for detecting a liquid level in a fuel tank according to the present invention.

3 is a cross-sectional view showing the mounting state of the guide employed in the present invention.

* Explanation of symbols for main parts of the drawings

2: fuel tank 16: battery

18: ignition key switch 22: fuel gauge

24: Instruction 26: Pin

28: amateur 30: shaft support plate

32: shaft 34: spiral coil

36: float 38, 38 ': link

40, 40 ', 40' ': Pin 42: fixed plate

44: guide rail 46: guide

47: first terminal 48: second terminal

50: contact plate 52: contact

54, 56: wire 60: rotor

60a: spiral groove 62: resistance wire

The above object of the present invention is a fuel tank liquid level detection device comprising a fuel tank storing fuel and a fuel gauge indicating a residual amount of fuel in accordance with the liquid level in the fuel tank, the lower end of which is attached to the bottom surface of the fuel tank. A shaft rotatably mounted on the shaft support plate, the upper end of which is rotatably supported by a fixing plate coupled to the upper surface of the fuel tank via a guide rail, and the lower end of which is fixed to the shaft supporting plate and the upper end of the fixing plate adjacent to A spiral coil fixed to the shaft, a float mounted to move up and down in a spiral coil according to the height of the oil through a link, and a fixed wire fixed to the upper end of the shaft to be rotated integrally on a fixed plate. A spiral groove is formed and a rotor having a first terminal attached to an upper end thereof, The second terminal is fixed to one end of the contact plate that is in contact with the resistance wire, and is achieved by the liquid level detection device of the fuel tank, characterized in that consisting of a guide that slides up and down along the guide rail.

Hereinafter, a liquid level detecting apparatus for a fuel tank according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3. (The same components as those of the conventional structure described in FIG. 1 are denoted by the same reference numerals. )

Figure 2 is a block diagram showing a liquid level detection apparatus of the fuel tank according to the present invention, Figure 3 is a cross-sectional view showing the mounting state of the guide employed in the present invention.

In the overall configuration of the liquid level detection device of the fuel tank according to the preferred embodiment of the present invention, the shaft 32 is rotatably mounted in the fuel tank 2, and the spiral coil 34 is wound around the outer circumferential surface thereof, and the fixed plate ( The rotor 36 is rotated with the shaft 32 on the fixed plate 42 and the float 36 which moves up and down by the spiral coil 34 according to the height of the oil surface through a link connected to 42). It consists of 60. The lower end of the shaft 32 is rotated on the center projection (30a) of the shaft support plate (30).

Here, the lower end of the shaft 32 is rotatably mounted on the axial support plate 30 attached to the bottom surface of the fuel tank 2, and the upper end thereof is the fuel tank upper surface 2a via the guide rail 44. The float 36 is fitted to the helical coil 34 fixed to the fixed plate 42 coupled to the lower end, and fixed to the axial support plate 30.

The float 36 is mounted so that it may move up and down on the helix coil 34 according to the height of the oil surface via a link. In addition, the outer circumferential surface of the rotor 60 fixed to the upper end of the shaft 32 and integrally rotated with the shaft 32 is formed with a spiral groove 60a in which a resistance wire 62 is wound. The terminal 47 is attached. The first terminal 47 is grounded to the vehicle body via the wire 56.

The link consists of a first rod 38 and a second rod 38 ', the lower end of the first rod 38 being fixed to the float 36 by a pin 40', and the second rod 38 ' ) Is coupled to the upper end of the first rod 38 by a pin 40, and the upper end is fixed to the fixing plate 42 by a pin 40 ″.

The contact wire 52 is always kept in contact with the resistance wire 62 wound around the spiral groove 60a of the rotor 60, and the contact wire 52 is attached to the bottom surface of the contact plate 50. . The second terminal 48 is fixed to the other end of the contact plate 50. The second terminal 48 is configured to transmit the mask resistance value transmitted through the contact 52 to the armature 28 of the fuel gauge 22.

As shown in FIG. 3, the guide 46 to which the contact plate 50 is fixed is slid up and down along the guide rail 44 while rotating the rotor 60 transmitted through the shaft 32. Accordingly, the contact 52 always maintains contact with the resistance wire 62 wound around the spiral groove 60a of the rotor 60.

Next, the process of measuring the flow rate using the liquid level detection device of the fuel tank having such a configuration will be described.

As the amount of fuel in the fuel tank 2 decreases, the float 36 moves downward by the spiral coil 34 in proportion to the oil level of the fuel tank 2 due to buoyancy. At this time, since the float 36 is coupled to the lower end of the link connected to the fixed plate 42, and descends vertically by the spiral coil 34, the shaft 32 on which the upper end of the spiral coil 34 is fixed. ) Will begin to rotate.

Rotor 60 fixed to the upper end by the rotation of the shaft 32 is rotated on the fixed plate 42. As a result, when one end of the contact plate 50 mounted on the guide rail 44 via the guide 46 descends on the spiral groove 60a formed in the rotor 60, the variable resistance value is changed at this time. Is transmitted to the amateur 28 through the second terminal 48.

Therefore, when the key switch 18 is turned on, the electricity of the battery 16 is supplied to the armature 28 through the hot wire, and the contact pressure change at the contact 52 is generated. At this time, the contact pressure becomes weak when the float 36 falls, and the current flowing through the armature 28 also becomes small because the conduction time flowing through the hot wire is shortened by the weakened contact pressure. Therefore, the instructions 24 in the fuel gauge 22, which are connected to the armature 28, gradually move toward E.

According to the present invention described above, the shaft is wound in the fuel tank is rotatably mounted, then the float attached to the spiral coil is rotated while moving up and down in accordance with the height of the oil surface to rotate the upper rotating plate By measuring the resistance value which is changed by rotating, the fuel remaining amount and the state of the instrument panel are displayed in a one-dimensional straight line, compared to the conventional method of displaying a two-dimensional curve, so that the driver can determine the correct fuel level. .

Claims (3)

In the fuel tank liquid level detection device comprising a fuel tank (2) storing fuel and a fuel gauge (22) indicating a fuel residual amount in accordance with the liquid level in the fuel tank (2), the lower end of the fuel tank (2) Is rotatably mounted on the axial support plate 30 attached to the bottom surface thereof and the upper end is rotatably supported by the fixing plate 42 coupled to the fuel tank upper surface 2a via the guide rail 44. Shaft 32, the lower end is fixed to the axial support plate 30 and the upper end of the spiral coil 34 is fixed to the shaft 32 adjacent to the lower end of the fixing plate 42, and through the link of the oil surface Float 36 mounted on the spiral coil 34 to move up and down in accordance with the height, and is fixed to the upper end of the shaft 32 is rotated integrally on the fixing plate 42, the resistance line ( 62 is wound spiral groove (60a) is formed The upper terminal includes a rotor 60 having a first terminal 47 attached thereto, and a second terminal fixed to one end of a contact plate that maintains contact with the resistance line 62 through a contact 52. 48) is attached, the liquid level detection device of the fuel tank, characterized in that consisting of a guide 46 which is slid up and down along the guide rail (44). 2. The link of claim 1 wherein the link consists of a first lot 38 and a second rod 38 ', the lower end of the first rod 38 being connected to the float 36 by a pin 40'. The lower end of the second rod 38 'is coupled with the upper end of the first rod 38 by the pin 40, and the upper end is fixed to the fixing plate 42 by the pin 40' '. Liquid level detection device of the fuel tank, characterized in that. The fuel gauge of claim 1, wherein the first terminal 47 is grounded to the vehicle body via a wire 56, and the second terminal 48 receives a variable resistance value transmitted through the contact 52. A liquid level detection device for a fuel tank, which is connected to the armature 28 of the tank.

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