CN202583903U - Capacitive liquid level controller - Google Patents
Capacitive liquid level controller Download PDFInfo
- Publication number
- CN202583903U CN202583903U CN 201220224355 CN201220224355U CN202583903U CN 202583903 U CN202583903 U CN 202583903U CN 201220224355 CN201220224355 CN 201220224355 CN 201220224355 U CN201220224355 U CN 201220224355U CN 202583903 U CN202583903 U CN 202583903U
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- CN
- China
- Prior art keywords
- liquid level
- level controller
- capacitive liquid
- capacitance
- outer tube
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- Expired - Lifetime
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Abstract
The utility model relates to a capacitive liquid level controller. The capacitive liquid level controller comprises a capacitive liquid level sensor and a control instrument, wherein the control instrument internally comprises a casing, the casing is internally provided with a control circuit, an audible and visual alarm and a relay switch, the control circuit comprises a resonator, a frequency comparator and a power driver which are in direct coupling connection successively, the capacitive liquid level sensor is connected with the resonator through coaxial cable, and the audible and visual alarm and the relay switch are respectively connected with the power driver through wire. According to the capacitive liquid level controller, a resistance capacity resonance digital frequency comparison circuit mode is employed; a digital integrated circuit and signal processing principles are employed; an auxiliary analog power drive circuit structure is utilized; and signal drift is generated because of influence of temperature on transmission cable, so temperature compensating elements are arranged for compensation to make the detection device stable and reliable and be not influenced easily. The capacitive liquid level controller is reasonable in structure and convenient in usage, has high measuring precision, does not cause false trigger or missed trigger and greatly improves reliability of the whole system.
Description
Technical field
The utility model relates to a kind of fluid level controller, particularly a kind of capacitance type liquid level controller.
Background technology
The capacitance type liquid level controller generally is to utilize air (specific inductive capacity approximates 1) different with the specific inductive capacity of measured medium (specific inductive capacity is generally greater than 1), thus make probe when placing air neutralising fluid medium its electric capacity will change perception probe position whether liquid is arranged.According to the capacitor principle, two blocks of electric capacity that the mutually insulated pole plate constitutes, its electric capacity is proportional to the pole plate relative area, is proportional to specific inductive capacity, is inversely proportional to the phase mutual edge distance.If, generally be that electric capacity increases so probe is that medium becomes when being medium with other liquid from air, detect this variable quantity by back-end circuit again, driving execution element, output switching value and sound and light signal wait and detect and control liquid level.The capacitance type liquid level controller generally is usually used in preventing liquid level Control work such as overflow in the conveying, loading and unloading of liquid.
Existing capacitance type liquid level controller mainly utilizes bridge type and these two kinds of simulation circuit structures of width formula to make the capacitance type liquid level control circuit; There is following shortcoming in the two structure; 1, performance is subject to such environmental effects; Like temperature, the variation of electromagnetic field etc. all can influence the reliability of its observing and controlling easily; 2, telemetry circuit requires height to the probe part processing precision, and consistance is difficult for guaranteeing; 3, sensitivity is difficult for adjustment, and mimic channel oneself drift value is big, causes false triggering to trigger with leaking easily, and the reliability of complete machine work is reduced greatly.
Summary of the invention
The utility model technical matters to be solved is the deficiency to prior art, provides a kind of reasonable in design, easy to use, strengthens the capacitance type liquid level controller of measuring stability reliability.
The utility model technical matters to be solved is to realize through following technical scheme; The utility model is a kind of capacitance type liquid level controller; Comprise capacitance level transducer and controller; Comprise housing in the controller, be provided with control circuit, audible-visual annunciator and relay switch in the housing, be characterized in: described control circuit comprises resonator, frequency comparator and the analog line driver that directly is of coupled connections successively; Described capacitance level transducer joins through coaxial wire and resonator, and described audible-visual annunciator and relay switch join through electric wire and analog line driver respectively.
The utility model technical matters to be solved can also further realize through following technical scheme; Described capacitance level transducer comprises electrode and wiring end cap; End at electrode is provided with insulation sleeve, is connected with inner sleeve on the insulation sleeve, and above-mentioned electrode is located in the inner sleeve; Be provided with insulated terminal in the described wiring end cap, connect through connecting link between insulated terminal and the insulation sleeve, inner sleeve is provided with outer tube outward, and outer tube one end links to each other with the wiring end cap, is respectively equipped with bleeder vent on described inner sleeve and the outer tube.
The utility model technical matters to be solved can also realize that further described outer tube is provided with the rain cover that covers bleeder vent through following technical scheme.
Compared with prior art, the utility model constitutes capacitance-resistance resonance together through capacitance level transducer, resonator and frequency comparator--and digitization frequencies comparator circuit pattern, adopt digital integrated circuit and signal Processing principle; Be aided with the simulated power driving circuit structure, temperature compensating element be set, make detecting devices reliable and stable for compensation transmission cable temperature influence produces signal drift; Be not easy affected by environment; It is rational in infrastructure, and is easy to use, and measuring accuracy is high; Can not cause false triggering to trigger, improve the reliability of complete machine greatly with leaking.
Description of drawings
Fig. 1 is a kind of theory diagram of the utility model.
Fig. 2 is a kind of structural representation of capacitance level transducer.
Embodiment
Following with reference to accompanying drawing, further describe the concrete technical scheme of the utility model, so that those skilled in the art understands the utility model further, and do not constitute restriction to its right.
Embodiment 1, with reference to Fig. 1, and a kind of capacitance type liquid level controller; Comprise capacitance level transducer and controller; Comprise housing in the controller, be provided with control circuit, audible-visual annunciator and relay switch in the housing, described control circuit comprises resonator, frequency comparator and the analog line driver that directly is of coupled connections successively; Described capacitance level transducer joins through coaxial wire and resonator, and described audible-visual annunciator and relay switch join through electric wire and analog line driver respectively.
Described resonator and frequency comparator have used digital integrated circuit (HA17555 HEF4013BP HCF4098BE).
Capacitance level transducer is placed in the liquid during use; Give control circuit with the capacitance variations data transmission; Control circuit detects this variable quantity, drives audible-visual annunciator and relay switch through analog line driver, comes to detect intuitively and control liquid level through audible-visual annunciator and relay switch.
This controller uses its output only relevant with electric capacity; And irrelevant with other factors, and circuit do not have transient state basically, is output as two kinds of typicalnesses 0 and 1 of digital circuit; Circuit re-uses multilayer coaxial capacitance formula liquid level sensor; Constitute a kind of brand-new capacitance type liquid level detecting devices, it is stable and reliable for performance, is a kind of economical and practical liquid level detector; Through according to the specific inductive capacity of survey liquid and suitably revise size sensor and structure, can be used for the liquid level controlling of most liquid.
Embodiment 3, and in the embodiment 2 described capacitance type liquid level controllers, described outer tube 6 is provided with the rain cover 4 that covers bleeder vent, prevents that rainwater from entering on the electrode 8 from bleeder vent, influences measuring accuracy.
Claims (3)
1. capacitance type liquid level controller; Comprise capacitance level transducer and controller; Comprise housing in the controller, be provided with control circuit, audible-visual annunciator and relay switch in the housing, it is characterized in that: described control circuit comprises resonator, frequency comparator and the analog line driver that directly is of coupled connections successively; Described capacitance level transducer joins through coaxial wire and resonator, and described audible-visual annunciator and relay switch join through electric wire and analog line driver respectively.
2. capacitance type liquid level controller according to claim 1 is characterized in that: described capacitance level transducer comprises electrode and wiring end cap, is provided with insulation sleeve at an end of electrode, is connected with inner sleeve on the insulation sleeve, and above-mentioned electrode is located in the inner sleeve; Be provided with insulated terminal in the described wiring end cap, connect through connecting link between insulated terminal and the insulation sleeve, inner sleeve is provided with outer tube outward, and outer tube one end links to each other with the wiring end cap, is respectively equipped with bleeder vent on described inner sleeve and the outer tube.
3. capacitance type liquid level controller according to claim 2 is characterized in that: described outer tube is provided with the rain cover that covers bleeder vent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220224355 CN202583903U (en) | 2012-05-18 | 2012-05-18 | Capacitive liquid level controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220224355 CN202583903U (en) | 2012-05-18 | 2012-05-18 | Capacitive liquid level controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202583903U true CN202583903U (en) | 2012-12-05 |
Family
ID=47253295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220224355 Expired - Lifetime CN202583903U (en) | 2012-05-18 | 2012-05-18 | Capacitive liquid level controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202583903U (en) |
-
2012
- 2012-05-18 CN CN 201220224355 patent/CN202583903U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121205 |