CN2738381Y - Liquid level relay - Google Patents
Liquid level relay Download PDFInfo
- Publication number
- CN2738381Y CN2738381Y CN 200420086078 CN200420086078U CN2738381Y CN 2738381 Y CN2738381 Y CN 2738381Y CN 200420086078 CN200420086078 CN 200420086078 CN 200420086078 U CN200420086078 U CN 200420086078U CN 2738381 Y CN2738381 Y CN 2738381Y
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- CN
- China
- Prior art keywords
- liquid level
- relay
- electrode
- driver
- trigger
- 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
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Abstract
The utility model relates to a liquid level relay used for controlling the water level of the hydraulic supply. The liquid level relay is composed of a double signals compare amplifier with a liquid level control electrode, a trigger, a driver and a relay. The output terminal of the double signals compare amplifier is connected with the trigger input terminal of the relay through the trigger and the driver orderly. The liquid level relay has the advantages of reasonable structure, convenient operation, and accurate and stable performance of the water level control. The liquid level relay can effectively prolong the lifetime of the electrode in the water and the length of the outer control lock line is provided with no requirement and no limitation.
Description
Affiliated technical field
The utility model belongs to the electrical apparatus control equipment technical field, relates to a kind of liquid level relay that is used for the control of municipal water supply systematic water level.
Background technology
In the existing water supply installation, the water level signal of controller all is taken from the metal electrode in the pond (water tank), because the voltage that is added in the electrode control is AC signal, Control current is bigger, and the ionization of the natural rust of electrode and alternating current corrosion is quite serious in the pond.In addition, AC signal is also had relatively high expectations to the length (being referred to as line capacitance) of transmission locking wire, generally all be limited within 250 meters, otherwise with ability out of hand.
The utility model content
The purpose of this utility model is to overcome the deficiency that prior art exists, so provide a kind of rational in infrastructure, easy to operate, water level control performance accurately, safety, stable, can effectively prolong useful life and the outer control lock line length no requirement (NR) liquid level relay that limit of electrode in water.
The technical solution that adopts is so for achieving the above object: the liquid level relay that is provided is made up of dual signal comparison amplifier, trigger, driver and the relay of band liquid level control electrode, dual signal comparison amplifier output is connected to the input of driver behind trigger, output end of driver is connected with the triggering input of relay.
The utility model is by above-mentioned solution, change water supply installation into DC control by original interchange control forms, solved because of locking wire long, line capacitance is greatly to the influence of system, reduced the electric current that is added to control electrode and then reduced the degree of ionization of electric current electrode, effectively prolonged the useful life of electrode in water, (alternating current of former technology control electrode is not 1mA in test, the direct current of existing control electrode is 0.1mA), again because working signal adopts IC processing of circuit signal, this liquid level relay reliability is strengthened, control sensitivity improves, stable performance, water level control is more accurate, safety, the corrosion degree of the electrode in the use in the control pond obviously reduces, outer control lock line length no requirement (NR) restriction has reduced maintenance capacity; In addition, this liquid level relay can with the LGYC-1 type liquid level sensor of designer development usefulness mutually, increased the versatility of this product, make performance more reliable and more stable, and then reach the purpose that makes water supply installation water level control system unmanned management.
Description of drawings
Fig. 1 is the operation principle schematic diagram of liquid level relay described in the utility model.
Fig. 2 is the circuit diagram of a specific embodiment of the utility model.
Embodiment
Referring to accompanying drawing, liquid level relay described in the utility model is made up of dual signal comparison amplifier 1, trigger 2, operating state indicating circuit 3, driver 4 and relay J, the input of dual signal comparison amplifier 1 and liquid level control electrode a, b, c UNICOM, dual signal comparison amplifier 1 output is connected to the triggering input of relay J successively behind trigger 2 and driver 4, and then by the output line control load of relay J.In the particular circuit configurations shown in the accompanying drawing 2; it is the device of LM138 that dual signal comparison amplifier 1 adopts model; three liquid level control electrode a, b, c are respectively level electrode, following level electrode and common point electrode; trigger 2 is that the device of NE1555 constitutes by model; driver 4 is made of power switch T; operating state indicating circuit 3 is made of light-emitting diode D, and is corresponding with operating state indicating circuit 3, is provided with " work ", " shutdown " state cue mark on the device panel.
Claims (1)
1, a kind of liquid level relay, it is characterized in that it by the band liquid level control electrode (a, b, c) dual signal comparison amplifier (1), trigger (2), driver (4) and relay (J) form, dual signal comparison amplifier (1) output is connected to the input of driver (4) behind trigger (2), the output of driver (4) is connected with the triggering input of relay (J).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420086078 CN2738381Y (en) | 2004-10-21 | 2004-10-21 | Liquid level relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420086078 CN2738381Y (en) | 2004-10-21 | 2004-10-21 | Liquid level relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2738381Y true CN2738381Y (en) | 2005-11-02 |
Family
ID=35348286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420086078 Expired - Fee Related CN2738381Y (en) | 2004-10-21 | 2004-10-21 | Liquid level relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2738381Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100495619C (en) * | 2006-01-11 | 2009-06-03 | 中国科学院西安光学精密机械研究所 | Water passage protection relay |
-
2004
- 2004-10-21 CN CN 200420086078 patent/CN2738381Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100495619C (en) * | 2006-01-11 | 2009-06-03 | 中国科学院西安光学精密机械研究所 | Water passage protection relay |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |