CN2921795Y

CN2921795Y - Capacitive liquid level liquid temperature sensing device

Info

Publication number: CN2921795Y
Application number: CN200620096042.0U
Authority: CN
Inventors: 张文忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-04-05
Filing date: 2006-04-05
Publication date: 2007-07-11
Anticipated expiration: 2016-04-05

Abstract

The utility model provides a capacitive liquid level liquid temperature sensing device which is characterized in that: the device has a metal tube and an inner electrode as a capacitor, wherein, the lower end of the metal tube is sealed and the metal tube is provided inside with a temperature sensor having a lead wire leading out of the metal tube; the outerwall of the metal tube is coated with a layer of insulation material as the medium of the capacitor and is also provided with an outer electrode connection. The utility model solves the problem that traditional dot-type liquid level sensing device is unable to realize continuous measurement and control of liquid level depth, and has the advantages of simple structure, low cost, long life-span, reliable working and being particularly suitable for measuring depth and temperature of liquid with electrical conductivity.

Description

Capacitance type liquid level liquid temperature sensing device

The ㈠ technical field: the utility model relates to sensing technology, is a kind of brand-new capacitance type liquid level liquid temperature sensing device.

The ㈡ background technology: traditional level gauging and control adopt the point type liquid level sensor to come control water level usually, this sensor can not carry out continuous measurement and control to the depth of liquid level, can only segmentation control and segmentation multi-line and structure are complicated more more, process difficult more, production cost is high more, and long-term use also can cause faulty sensor or damage because of its fouling and seepage.

The ㈢ summary of the invention: the purpose of this utility model is exactly to overcome the problem that traditional liquid level sensor can not carry out continuous coverage and control to the depth of liquid level, provides a kind of simple in structure, reliable operation, the capacitance type liquid level liquid temperature sensing device of long service life.

Design philosophy of the present utility model is: the principle that adopts Measurement of capacitor, sensor is made a size that changes its capacitance with the liquid level height, and will change corresponding electric signal output into the capacitance that the liquid level height changes, again temperature sensor is placed in the liquid level sensor, in measuring liquid level, the liquid temperature be can measure again, the measurement that it can be continuous and the degree of depth and the temperature of controlling liquid made.

Concrete scheme of the present utility model is: get the interior electrode of a metal tube as capacitor, the sealing of metal tube lower end, temperature sensor is housed in the metal tube, temperature sensor is leaded draws outside the metal tube, be coated with the medium of one deck insulating material at the metal tube outer wall, and be provided with the wiring of capacitor external electrode as capacitor.With the external electrode of fluid to be measured as capacitor.

For the convenience of the user, enhance product performance, dissolved in signal processing circuit (also can divide and be arranged) in the utility model, promptly one signal Processing box is arranged in the design of the upper end of metal tube, interior dress signal processing circuit, capacitor and temperature sensor that its input end connection metal tube and fluid to be measured are formed, the signal after output terminal will be handled adopts signal wire to draw outside the metal tube.

Structure of the present utility model is ingenious, and cost is low and simple, long service life, reliable operation, measurement that can be continuous and the degree of depth of controlling liquid and temperature.

(4) description of drawings:

Fig. 1 is the structural representation that the utility model adds signal processing circuit;

Fig. 2 is a basic structure synoptic diagram of the present utility model.

Among the figure: the 1-insulation course, the 2-iron pipe, the 3-external electrode connects piece, 4-temperature sensor, 5-signal processing circuit, 6-output signal line, 7-signal Processing box, 8-signal wire, 9-signal link, the wiring of 10-external electrode.

The ㈤ embodiment:

Example 1, referring to Fig. 1, this is one of preferred embodiment of the utility model, get 2 (or aluminium-alloy pipes of iron pipe of φ 8mm, metal tubes such as copper pipe) as the interior electrode of capacitor, its length is greater than the fluid to be measured degree of depth, and with the lower end closed of iron pipe 2, the temperature sensor 4 of packing into is in iron pipe 2 bottoms (temperature sensor 4 also can independently be provided with or not be provided with when need not to measure temperature).Be provided with signal Processing box 7 in the upper end of iron pipe 2, interior dress signal processing circuit 5.Be coated with insulation course 1 (or suit plastic tube, heat-shrink tube) as the medium of capacitor and make iron pipe and fluid to be measured forms and isolates at the outer wall of iron pipe 2, in the bottom of iron pipe 2, insulation course is equipped with the capacitor external electrode outward and connects piece 3 (any conducting metal piece all can).The input end of signal processing circuit 5 by signal wire 8,9, and external electrode wiring 10 connect iron pipe 2 respectively, temperature sensor 4, external electrode connects piece 3, and the output terminal of signal processing circuit 5 is drawn the outer connection control system of signal Processing box by output signal line 6 with electric signal.In the use, fluid to be measured is the external electrode as capacitor.

Example 2, referring to Fig. 2, this is one of the utility model basic structure, get 2 one of φ 10 steel pipes, its length is greater than the fluid to be measured degree of depth, on steel pipe 2, following closed at both ends, and the temperature sensor 4 of packing into before sealing is in the bottom of steel pipe 2, applies the medium of a layer insulating 1 as capacitor at the outer wall of steel pipe 2, in the bottom of steel pipe 2, outside the insulation course 1 the capacitor external electrode is housed and connects piece 3, adopt signal wire 8,9, reach external electrode wiring 10 and connect steel pipe 2 respectively, temperature sensor 4, external electrode connect piece 3, draw and the outer signal treatment circuit, the signal processing circuit in the present embodiment is independent external.Above-mentioned capacitor external electrode connect piece 3 also shouldn't, directly connect by external electrode wiring 10 and fluid to be measured, fluid to be measured is the external electrode as capacitor.

Claims

1. capacitance type liquid level liquid temperature sensing device, include temperature sensor, it is characterized in that: have a metal tube, interior electrode as capacitor, temperature sensor is equipped with in the sealing of metal tube lower end in the metal tube, temperature sensor is leaded draws outside the metal tube, be coated with the medium of one deck insulating material at the metal tube outer wall, and be provided with the wiring of capacitor external electrode as capacitor.

2. a kind of capacitance type liquid level liquid temperature sensing device according to claim 1, it is characterized in that: one signal Processing box is arranged in the design of the upper end of metal tube, interior dress signal processing circuit, its input end connects electrode and external electrode and temperature sensor in the metal tube respectively, and output terminal has output signal line to draw outside the metal tube.