CN206638312U - Capacitive liquid-level detecting device - Google Patents
Capacitive liquid-level detecting device Download PDFInfo
- 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
- Authority
- CN
- China
- Prior art keywords
- sampling probe
- becket
- coaxial cable
- detecting device
- level detecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 14
- 238000005070 sampling Methods 0.000 claims abstract description 42
- 239000000523 sample Substances 0.000 claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 239000011810 insulating material Substances 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 239000002184 metal Substances 0.000 abstract description 5
- 238000007689 inspection Methods 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 241000208340 Araliaceae Species 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 208000008425 Protein Deficiency Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 235000005035 ginseng Nutrition 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001429 stepping Effects 0.000 description 1
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
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.
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
ID=60245672
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)
| 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 |
-
2017
- 2017-04-21 CN CN201720429475.1U patent/CN206638312U/en not_active Expired - Fee Related
Cited By (1)
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |