CN206638312U - Capacitive liquid-level detecting device - Google Patents

Capacitive liquid-level detecting device Download PDF

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Publication number
CN206638312U
CN206638312U CN201720429475.1U CN201720429475U CN206638312U CN 206638312 U CN206638312 U CN 206638312U CN 201720429475 U CN201720429475 U CN 201720429475U CN 206638312 U CN206638312 U CN 206638312U
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CN
China
Prior art keywords
sampling probe
becket
coaxial cable
detecting device
level detecting
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Expired - Fee Related
Application number
CN201720429475.1U
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Chinese (zh)
Inventor
王树梅
Original Assignee
王树梅
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Priority to CN201720429475.1U priority Critical patent/CN206638312U/en
Application granted granted Critical
Publication of CN206638312U publication Critical patent/CN206638312U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

It the utility model is related to inspection equipment technical field, more particularly to a kind of capacitive liquid-level detecting device, including detecting circuit, also include stepper motor, the fixed sampling probe in lower end of stepper motor, the outside of sampling probe set becket, fill insulant between becket and sampling probe, detection circuit is connected with becket and sampling probe respectively by coaxial cable, and becket and sampling probe are respectively as two electrodes;The utility model structure is novel, when manufacturing, two electrode size machining accuracies are controllable, position is fixed, it ensure that its consistency, metal ring is connected on the outside of sampling probe, the relative close that two interelectrode spacing can be done, it is easy to be connected with coaxial cable and detection circuit, effectively avoids signal interference, substantially increase the precision and reliability of detection.

Description

Capacitive liquid-level detecting device
Technical field
It the utility model is related to inspection equipment technical field, and in particular to a kind of capacitive liquid-level detecting device.
Background technology
Detecting liquid level technology is various automatic biochemical detections, the important component of analytical instrument.These instrument and equipments exist All have to first carry out sampling work during work, when being sampled, declined rapidly by motor drive mechanism driving sampling probe, progressively connect The liquid level of nearly tested sample, when touching sample liquid level, can be judged rapidly, according to sampling amount control sampling probe probe into by The depth of test sample sheet.With advantages below:1. reduce hang drop to greatest extent.2. detecting sample surplus, during surplus deficiency, accuse in time It is alert, avoid the detection error caused by surplus deficiency.Capacitance level Detection Techniques are because its principle is simple, cost is low, it is real to be easy to The features such as existing, turn into most widely used method.
The making of electric capacity is most important in capacitance level Detection Techniques, at present using most preparation methods such as Fig. 3 institutes Show:It mainly includes detection circuit 7, stepper motor 4, sampling probe 1, metal base plate 11 etc., and sampling probe 1 is used as an electrode, glass Metal base plate 11 below container is used as another electrode, and two electrodes form sampling capacitor 8 with space environment and detection circuit 7, Change by detecting this sampling capacitor 8 realizes level sensing and tracks the tracking of liquid level situation of change.This mode makes letter It is single and easily realize, but the cable length used is longer, have that anti-interference is poor, big, uniformity is influenceed by space environment and can By property it is not strong the problems such as, be not suitable for the high application scenario of accuracy of detection.
Utility model content
In order to solve the above-mentioned technical problem the deficiency in, the purpose of this utility model are:A kind of capacitance level is provided Detection device, strong interference immunity, reliability are high, measurement accuracy is high, uniformity is preferable.
The utility model is that technical scheme is used by solving its technical problem:
The capacitive liquid-level detecting device, including detection circuit, in addition to stepper motor, the lower end of stepper motor are fixed Sampling probe, the outside of sampling probe sets becket, fill insulant between becket and sampling probe, and detection circuit passes through same Shaft cable is connected with becket and sampling probe respectively, and becket and sampling probe are respectively as two electrodes.
Further preferably, coaxial cable includes coaxial cable core wire, and the outside of coaxial cable core wire sets coaxial cable screen Cover layer.
Further preferably, insulating materials is epoxy resin.
Compared with prior art, the utility model has the advantages that:
The utility model structure is novel, and when manufacturing, two electrode size machining accuracies are controllable, position is fixed, and ensure Its consistency, metal ring are connected on the outside of sampling probe, relative close that two interelectrode spacing can be done, it is easy to coaxial Cable is connected with detection circuit, effectively avoids signal interference, substantially increases the precision and reliability of detection.
Brief description of the drawings
Fig. 1 the utility model structure diagrams;
Fig. 2 the utility model sampling needle structural representations;
Fig. 3 the utility model background technology structural representations.
In figure:1st, sampling probe;2nd, insulating materials;3rd, becket;4th, stepper motor;5th, coaxial cable core wire;6th, coaxial electrical Cable screen layer;7th, circuit is detected;8th, sampling capacitor;9th, sample;10th, glass container;11st, metal base plate.
Embodiment
The utility model embodiment is described further below in conjunction with the accompanying drawings:
Embodiment 1
As shown in Figure 1-2, capacitive liquid-level detecting device described in the utility model, including detection circuit 7, in addition to stepping Motor 4, the fixed sampling probe 1 in lower end of stepper motor 4, stepper motor 4 control sampling probe 1 to move up and down, the outside of sampling probe 1 Becket 3, fill insulant 2 between becket 3 and sampling probe 1 are set, and specific becket 3 is nested in the outer of sampling probe 1 Side, to be isolated by insulating materials 2 therebetween, insulating materials 2 is epoxy resin, and epoxy resins insulation is preferable, and With preferable adhesive strength and chemical-resistance, detection circuit 7 by coaxial cable respectively with becket 3 and sampling probe 1 It is connected, respectively as two electrodes, sampling probe 1 is used as an electrode for becket 3 and sampling probe 1, and becket 3 is used as another electricity Pole, two electrodes form the stable sampling capacitor 8 of a medium.
Wherein, coaxial cable includes coaxial cable core wire 5, and the outside of coaxial cable core wire 5 sets coaxial cable shielding layer 6, effectively avoid signal interference.
It is of the present utility model to use process:
In use, by controlling stepper motor 4, becket 3 and sampling probe 1 is set to decline rapidly, close to glass container 10 9 surface of sample when, saltus step occurs for the sampling capacitor 8 that is formed therebetween, then according to the length that sampling probe 1 declines as ginseng Examine, the change by detecting this sampling capacitor 8 realizes level sensing and tracks the tracking of liquid level situation of change.

Claims (3)

1. a kind of capacitive liquid-level detecting device, including detection circuit (7), it is characterised in that also including stepper motor (4), step The fixed sampling probe in lower end (1) of stepper motor (4), the outside of sampling probe (1) set becket (3), becket (3) and sampling probe (1) fill insulant (2) between, detection circuit (7) by coaxial cable respectively with becket (3) and sampling probe (1) phase Connection, becket (3) and sampling probe (1) are respectively as two electrodes.
2. capacitive liquid-level detecting device according to claim 1, it is characterised in that coaxial cable includes coaxial electrical cable core Line (5), the outside of coaxial cable core wire (5) set coaxial cable shielding layer (6).
3. capacitive liquid-level detecting device according to claim 1, it is characterised in that insulating materials (2) is epoxy resin.
CN201720429475.1U 2017-04-21 2017-04-21 Capacitive liquid-level detecting device Expired - Fee Related CN206638312U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720429475.1U CN206638312U (en) 2017-04-21 2017-04-21 Capacitive liquid-level detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201720429475.1U CN206638312U (en) 2017-04-21 2017-04-21 Capacitive liquid-level detecting device

Publications (1)

Publication Number Publication Date
CN206638312U true CN206638312U (en) 2017-11-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201720429475.1U Expired - Fee Related CN206638312U (en) 2017-04-21 2017-04-21 Capacitive liquid-level detecting device

Country Status (1)

Country Link
CN (1) CN206638312U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113324619A (en) * 2021-06-02 2021-08-31 成都瀚辰光翼科技有限责任公司 Liquid level detection method and device based on capacitance detection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113324619A (en) * 2021-06-02 2021-08-31 成都瀚辰光翼科技有限责任公司 Liquid level detection method and device based on capacitance detection

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GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20171114

Termination date: 20180421

CF01 Termination of patent right due to non-payment of annual fee