CN2463808Y

CN2463808Y - Level detecting device

Info

Publication number: CN2463808Y
Application number: CN 01213358
Authority: CN
Inventors: 罗瑞杨
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-02-07
Filing date: 2001-02-07
Publication date: 2001-12-05
Anticipated expiration: 2011-02-07

Abstract

The utility model relates to a liquid level detection device. The primary structure of the utility model is that the upper end of an inner tube (30) is provided with an upper fixing base (55), and the lower end is provided with a base (50); the outer wall of the inner tube (30) is wound with a coil (35) which has two wire leading out ends (70); the inner tube (30) wound with the coil (35) is arranged in an outer sleeve pipe (40) sheathed with a magnetic floater (45) which can axially slide along the outer sleeve pipe. The device is of a non-contact induction type, has the advantages of reliable detection performance, good shock resistance, high durability, low cost, etc., and is suitable for detecting the liquid quantity of various detected liquids.

Description

Liquid level detection device

The utility model relates to a kind of induction type liquid level pick-up unit.

The liquid level detection device of prior art as shown in Figure 1.Its primary structure is, pedestal (10) lower end the has been provided with setting-in circular shell of nichrome coils (18), the jointed shaft of its circle centre position (20) is hinged connecting rod (14), and an end of connecting rod (14) is equipped with ball float (12) and in addition end be sensing head (16); Described sensing head (16) is subjected to the spring force effect and keeps in touch with arc nichrome coils (18).When this device places fuel tank or other testing liquid, ball float (12) can swim on the liquid level, this ball float (12) changes corresponding height and position along with the upper-lower position variation of liquid level, sensing head (16) sliding contact that makes other end of connecting rod (14) thus is in corresponding nichrome coils (18), its displacement produces different resistance values and delivers to the respective detection circuit by Communication signal wire (22), and can show reading by instrument.The shortcoming of read apparatus has: more complex structure, the cost height of making of member; Sensing head (16) and nichrome coils (18) can make the latter that fracture takes place in long-term rubbing contact process and cause fault, and this two contact gap can produce the problem ineffective or that abrasion is excessive that detects respectively when excessive or too small, and functional reliability is descended; Device is used in internals fault or misoperation also often takes place in the vibration environment such as motor vehicle oil tank, and device is damaged or flase drop.

The purpose of this utility model is, designs a kind of liquid level detection device, is contactless induction type, has the dependable performance of detection, durable in use, simple in structure, advantage such as cost of manufacture is low.

The technical solution of the utility model is, it has interior pipe, should in the upper end of pipe upper fixed seat is housed and base is equipped with in the lower end, its design feature is, the outer wall of described interior pipe is wound with coil and this coil has two to draw line end, in the described interior pipe unit outer tube that is wound with coil, being set with on the outer tube can be along outer tube magnetic buoyancy aid in axial sliding.

Make below in conjunction with accompanying drawing and to further specify.

Description of drawings:

Fig. 1 is the one type of prior art syringe structural drawing;

Fig. 2 is a kind of example structure of the present utility model;

Fig. 3 is that bulking block shown in Figure 2 is the structural drawing of released state;

Fig. 4 is the prior art circuits figure of embodiment;

Structural representation when Fig. 5 is practical application;

Fig. 6 and Fig. 7 are respectively that the syndeton of interior pipe and outer tube and holder is given an example.

In the drawings:

The 10-pedestal, 31-L type elongated slot,

The 12-ball float, the 34-threaded portion,

The 14-connecting rod, the 35-coil,

16-sensing head 40-outer tube,

18-nichrome coils 41-L type draw-in groove,

The 20-jointed shaft, the 45-ball float,

The 22-Communication signal wire, the 50-base,

Pipe in the 30-, the 55-upper fixed seat,

551-trip, 68-frequency be to electric pressure converter,

The 60-circular hole, the 69-driving circuit,

The 65-circuit board, 70-draws line end,

The 66-fixed capacity, the 80-Displaying Meter,

67-LC oscillator 81-voltage stabilizer.

By Fig. 2 and Fig. 3 as can be known, the utility model has interior pipe (30), should in upper end of pipe (30) upper fixed seat (55) is housed and there is base (50) lower end, its design feature is, interior pipe (30) outer wall is wound with coil (35) and this coil (35) has two to draw line end (70) (referring to Fig. 3), the interior pipe (30) that is wound with coil (35) places outer tube (40), and being set with on this outer tube (40) can be along outer tube magnetic buoyancy aid (45) in axial sliding.This magnetic buoyancy aid (45) can be that the floated thing that inside is embedded with magnetic material is made.Can threaded portion (34) be set in the end of interior pipe (30) and realize its two ends respectively with being threaded of upper fixed seat (55) and base (50), also can adopt Fig. 6 to be connected with tenon shape shown in Figure 7.Described coil (35) draw line end (70) in order to link to each other with control circuit, this control circuit can be located at the position (being made of one as Displaying Meter) beyond this device, also can be located on the upper fixed seat (55) as shown in Figure 2, control circuit can adopt the prior art structure, and a kind of side circuit as shown in Figure 4.

Principle of work of the present utility model is (referring to Fig. 5), device is put into fluid to be measured, draw coil (70) and be connected to relevant control circuit as signal output end, then the inductance value of coil (35) will change along with the upper-lower position of magnetic buoyancy aid (45) and change, and being the position, magnetic buoyancy aid (45) changes along with the liquid level of fluid to be measured just changes, make the inductance value variation of coil (35) change and change thus corresponding to the fluid to be measured liquid level position, and control circuit is delivered in the variation of this inductance value can draw reading by Displaying Meter (80) after treatment, thereby realizes the amount of liquid of fluid to be measured is detected.

As known from the above, the utility model is a liquid level detection device, is contactless magnetoelectric induction, and its detecting reliability is good, and is durable in use, and vibration resistance is simple in structure, and low cost of manufacture is suitable for motor vehicle oil tank and various fluid to be measured and uses.

Embodiment: as the utility model device of Fig. 2, Fig. 4, Fig. 6, shown in Figure 7 and said structure, whole height 300～500mm, driver produces 5 volts of voltages of ¨ or 0～30 milliampere of electric current uses for Displaying Meter (80).

Claims

1, a kind of liquid level detection device, interior pipe (30) is arranged, should in upper end of pipe (30) upper fixed seat (55) is housed and there is base (50) lower end, it is characterized in that, interior pipe (30) outer wall is wound with coil (35) and this coil (35) has two to draw line end (70), the interior pipe (30) that is wound with coil (35) places outer tube (40), and being set with on the outer tube (40) can be along outer tube magnetic buoyancy aid (45) in axial sliding.