WO2000040932A1

WO2000040932A1 - A means for detecting fluid level

Info

Publication number: WO2000040932A1
Application number: PCT/CN1999/000002
Authority: WO
Inventors: Jui Yang Lo
Original assignee: Jui Yang Lo
Priority date: 1999-01-05
Filing date: 1999-01-05
Publication date: 2000-07-13
Also published as: AU1866999A

Abstract

A means for detecting fluid level is comprised of an inner tube (30), coils (35) winding outside of the inner tube, an outer tube (40), a ball float (45), a bottom base (50) and an upper fixed base (55); the ball float is inside the inner tube around which the coils are winding and the inner tube is covered with the outer tube. The upper end of the inner tube is engaged with the upper fixed base by screw thread and the lower end of the inner tube is engaged with the bottom base, the both ends of the outer tube are sealed by gluing to protect the coils winding outer of the inner tube; the position of ball float is changed with the varying of the height of the fluid level when the means detects the fluid level, and inductance is gererated in the coils, then convert the inductance into voltage value through the circuit and display the fluid height by the display apparatus; there is no contact point during the measuring processes of the means according to the invention, therefore, there is no friction. Furthermore, there are other advantages such as simple configuration, lower cost of the material and easy manufacture, and so on.

Description

TECHNICAL FIELD

The present invention relates to a liquid quantity detection device, and more particularly to a liquid quantity detection device in a non-contact point measurement type.

Background technique

The liquid amount detection device currently in common use, as shown in FIG. 1, is a liquid amount detection device composed of a floating ball device, which is mainly composed of: a base body 10, a floating ball 12, a connecting rod 14, a sensor head 16, and a nickel-chromium The coil 18, the rotating shaft 20, and the signal wire 22 are formed; the lower end of the base 10 is a circular shell, and a nickel-chromium coil 18 is placed therein. The nickel-chromium coil 18 is made by winding a nickel-chromium wire on a bakelite chip. There is a rotating shaft 20 at the center of the circular casing. The rotating shaft 20 is connected to a connecting rod 14. One end of the connecting rod 14 extends outwardly to connect to the floating ball 12, and the other end of the connecting rod 14 is connected to the sensor head 16. Its role is in contact with the arc-shaped nickel-chromium coil 18; when the liquid quantity detecting device is assembled in the oil tank or where the liquid quantity needs to be detected, the floating ball 12 floats on the liquid surface, and the sensor head 16 at the other end of the connecting rod 14, Sliding contact on the nickel-chromium coil 18; as the amount of liquid increases or decreases, the position of the floating ball 12 floating on the liquid surface changes accordingly, and the sensor head 16 connected to the connecting rod 14 slides on the nickel-chrome wire 18 Due to the displacement of the sensor head 16, different resistance values are generated, which are transmitted by the signal wire 22, and the resistance signal is upward. The output is read out by the display instrument to display the liquid volume. The main disadvantages of this liquid volume detection device are: First: Because it is composed of float 12, 12, connecting rod 14, sensor 16 and nickel-chromium coil 18, Makes the overall structure complicated and difficult to manufacture; Second: The use of a large number of components results in high material costs; Third: The contact point of the sensor head 16 and the nickel-chromium coil 18 is an induction form. In the case of long-term contact friction, nickel-chromium The coil 18 is easy to break, which causes failure and reduces its durability. Fourth: Because the nickel-chromium coil is placed in the center of the shell, the bakelite chip of the nickel-chromium coil 18 is bent into an arc shape, which cannot make the bakelite chip. The bending radian is uniform and complete, so that when the sensor head 16 and the nichrome wire 圏 18 are in inductive contact, if the gap between the sensor head 16 and the nichrome coil 18 is too large, the resistance value cannot be detected in this area. The gap between the probe 16 and the nickel-chromium coil 18 is too small. When friction occurs between the sensor 16 and the nickel-chromium coil 18, the nickel-chrome coil will break and cause damage. Fifth: When the liquid detection device is used for vibration Environment (e.g., the motor vehicle good detection), in case of a failure or malfunction of internal components often occurs, resulting in the damage detection apparatus, reduce the measurement accuracy. Summary of the invention

The object of the present invention is to provide a non-contact measurement type liquid level detection device with long use time and accurate measurement. Because the float moves with the change of the liquid volume inside the inner tube, it does not actually contact the coil. This type of measurement without contact points prevents the coil from breaking and makes it durable. Make sure that the detection device is not affected by vibration, so that the measurement of the detection device is accurate.

Another object of the present invention is to provide a liquid quantity detection device with high resolution and accurate measurement. The float moves with the change of the liquid volume and moves inside the inner tube. It interacts with the coils outside the inner tube. Different position values generate different inductance values to read the liquid volume data, so that the liquid volume detection device has higher resolution and more accurate detection. Be precise.

Another object of the present invention is to provide a liquid detection device with a simple structure, easy manufacturing, and low cost. The invention has no complicated mechanical structure and few components, which makes the structure simple, easy to manufacture, and low in cost.

Another object of the present invention is to provide a liquid quantity detection device which can be directly used in conjunction with a display meter. The inductive signal generated by the floating ball and the coil of the present invention is internally converted into a voltage signal, which can directly drive a display instrument, or a separate external conversion circuit is provided to convert the signal.

Another object of the present invention is to provide a liquid amount detection device with a wide range of applications. When the present invention meets special needs and uses, its inner tube length and coil winding length can be made according to needs, making its application range wider.

The liquid quantity detection device of the present invention is composed of: an inner tube, a coil wound outside the inner tube, an outer sleeve, a floating ball, a base, and an upper fixing seat; the inner tube of the outer winding coil, which has a floating ball inside, and the floating ball bag Magnetically covered material; an outer tube is sleeved on the outside of the inner tube. The upper end of the inner tube has a plurality of air holes and threads. The threads on the upper end of the inner tube are screwed with the screw holes of the upper holder. The lower end of the inner tube has a base. Water seepage holes; The two ends of the outer sleeve are sealed with a sealant to form a closed space to protect the coils outside the inner tube; the upper end of the upper holder is a round hole, which is used to place the circuit board; At this time, the floating ball inside the inner tube will change its position with the change of liquid volume, the coil generates electromagnetic induction, and it is converted into a voltage value by the circuit board in the upper fixed seat, and the liquid volume is displayed by an external display instrument.

Overview of the drawings

The invention is further described below with reference to the drawings and specific embodiments. FIG. 1 is a side view of a conventional liquid detection device;

FIG. 2 is a perspective view of a liquid amount detecting device according to the present invention; FIG.

FIG. 3 is an exploded schematic view of a liquid quantity detecting device according to the present invention;

FIG. 4 is a schematic diagram of an embodiment of a liquid quantity detection device according to the present invention.

The main part represents the symbol:

10 Seat 12 Float

14 connecting rod 16 sensor head

18 Nichrome coil 20 shaft

22 Signal wire 30 Inner tube

32 air holes 34 threads

35 coil 40 outer sleeve

45 float 50 base

52 Seepage hole 55 Upper mount

57 tapped holes 60 round holes

65 circuit board 70 signal line

80 display instrument

Best Mode of the Invention

As shown in Figs. 2 and 3, the liquid quantity detection device of the present invention is mainly composed of: an inner tube 30, a coil 35 wound outside the inner tube, an outer sleeve 40, a floating ball 45, a base 50, and an upper fixing seat 55; The inner tube 30 of the outer winding coil 35 is a hollow tube, and a floating ball 45 is placed inside the floating tube. The shape of the floating ball may be a circle, a square, or the like, and the floating ball 45 covers the magnetically sensitive material. The inner tube 30 The outer tube 40 is sheathed externally. The upper end of the inner tube 30 has a plurality of air holes 32 and threads 34. The upper thread 34 of the inner tube 30 is screwed with the screw hole 57 of the upper fixing seat 55. The lower end of the inner tube 30 is combined with a base 50. 50 has a plurality of water seepage holes 52; the two ends of the outer sleeve 40 are sealed with a sealant to protect the coil 35; the upper end of the upper fixing seat 55 has a round hole 60, which is used to place the circuit board 65, and this circuit board It can also be placed outside the liquid detection device. There is another signal line 70. One end of the signal line 70 is connected to the coil 35. The other end of the signal line 70 passes upward through the upper fixing seat 55 and is connected to the circuit board 65. The inner wall of the upper fixing seat has Round hole for signal line.

As shown in FIG. 4, which is an embodiment of the liquid quantity detection device with the above structure, the upper end of the inner tube 30 has a plurality of air holes 32, so that liquid can enter the inner tube 30 through the water seepage hole 52 of the base 50. Internally, the float 45 inside the inner tube 30 changes its position as the fluid volume changes, and interacts with the coil 35 outside the inner tube 30 to generate different inductance values. The signal is transmitted to the circuit board 65 by the signal line 70 The circuit board 65 is converted into a voltage value> The external display meter 80 is used to display the liquid volume.

Industrial applicability

Compared with the prior art, the liquid quantity detection device of the present invention has the following advantages: ''

1. The liquid amount detection device of the present invention, because the float moves with the change of the liquid amount, does not substantially contact the coil directly. This type of induction without contact points makes the detection device free from vibration and ensures that The detection device has accurate measurement, complete structure and good durability.

2. The liquid quantity detecting device of the present invention, because the float moves with the change of the liquid quantity inside the inner tube

It is mutually inductive with the coil outside the inner tube, and different inductance values are generated at different positions to read the liquid volume data, with high resolution and more accurate detection.

3. The liquid quantity detection device of the present invention has many advantages such as simple structure, easy manufacture, and low cost because there is no complicated mechanical structure.

4. The liquid quantity detection device of the present invention, as the inductance value obtained by the floating ball and the coil of the present invention is converted into a voltage value by the circuit board in the upper fixed seat, which can be directly used to promote the display instrument; The circuit converts signals so that the invention can be manipulated and used according to the actual environment.

5. When the liquid quantity detection device of the present invention meets special needs and uses, the length of its inner tube and coil can be made according to needs, and its practicality is strong.

The above are only the preferred embodiments of the present invention, and any equivalent transformation that does not depart from the technical content of the present invention falls within the protection scope of the present invention.

Claims

O 00/40932 Claim

What is claimed is: 1. A liquid quantity detection device, comprising: an inner tube, a coil wound outside the inner tube, an outer sleeve, a floating ball, a base, and an upper fixing seat; characterized in that: the inner tube of the outer wound coil, wherein There is a floating ball inside, the floating ball is covered with magnetically sensitive material; the outer tube is sheathed with an outer tube; the upper end of the inner tube is provided with a plurality of air holes and is threaded; the upper end of the inner tube is screwed with the screw hole of the upper fixing seat; The lower end of the tube is combined with a base, and the base has a plurality of water seepage holes; the two ends of the outer tube are sealed with a sealant to protect the coil;

The liquid quantity detection device according to claim 1, wherein the inner tube is a hollow tube.

The liquid amount detecting device according to claim 1, wherein the diameter of the outer tube is larger than the diameter of the inner tube.

The liquid quantity detection device according to claim 1, wherein the floating ball is covered with a magnetically sensitive material, and the shape of the floating ball can be circular, square, or the like.

The liquid quantity detecting device according to claim 1, characterized in that: the inner wall of the upper fixing seat is provided with a circular hole for the signal line to pass through.

6. The liquid amount detection device according to claim 1, wherein the conversion circuit can be placed outside the liquid amount detection device.