CN103196521B - The float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam - Google Patents
The float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam Download PDFInfo
- Publication number
- CN103196521B CN103196521B CN201310079818.2A CN201310079818A CN103196521B CN 103196521 B CN103196521 B CN 103196521B CN 201310079818 A CN201310079818 A CN 201310079818A CN 103196521 B CN103196521 B CN 103196521B
- Authority
- CN
- China
- Prior art keywords
- alarm
- float switch
- power supply
- control loop
- water level
- 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
Landscapes
- Level Indicators Using A Float (AREA)
Abstract
The present invention relates to a kind of float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam.The object of the invention is to provide a kind of float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam, reliably gives the alarm rapidly when there is free dredging flow.Technical scheme of the present invention: include control loop and alarm circuit; Control loop comprises relay, control loop power supply, and be vertically fixed on Overflow Section to be measured or close on monolith upstream dam facing and realize the float switch of break-make according to upper storage reservoir upstream water level, described control loop power supply one end is wherein electrically connected one end with relay coil, is electrically connected after other end series connection float switch with the relay coil other end; Described alarm circuit comprises alarm circuit power supply, and this power supply one end is electrically connected with one of them contact reed of relay, is electrically connected to another contact reed of relay after other end series connection warning device.The present invention is applicable in Hydraulic and Hydro-Power Engineering.
Description
Technical field
The present invention relates to a kind of alarm device for monitoring and prediction hydroenergy storage station upper storage reservoir dam generation free dredging flow, particularly a kind of float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam, is mainly applicable in Hydraulic and Hydro-Power Engineering.
Background technology
The release floodwatering facility of hydroenergy storage station upper storage reservoir dam is usually designed to the overflow weir form controlled without gate, when upper storage reservoir because of super take out cause upstream water level to exceed elevation of weir crest time, storehouse water is namely through overflow weir free dredging flow, not only bring economic loss to power plant, simultaneously also loss is to a certain degree caused to energy dissipater, even form potential safety hazard.If when upper storage reservoir dam occurs or be about to free dredging flow occurs, power plant staff can obtain early warning information in time, just can stop pumping, thus reduces or avoid economic loss.
Though current domestic hydroenergy storage station is provided with all, lower storage reservoir water-level measuring device, but the water level at its monitoring point place not necessarily can represent upstream water level, and the warning function of most water-level measuring device is very imperfect, lack onsite alarming and remote notification function, therefore design one independently monitoring prediction device is necessary, for power plant provides one reliably, obtain the information approach whether dam occurs or be about to occur free dredging flow rapidly, also be that existing normal water level detector and alarm is in power failure simultaneously, means are observed and predicted in the one backup that circuit damage or sensor fault etc. in particular cases provide.
Summary of the invention
The technical problem to be solved in the present invention is: for problems of the prior art, a kind of float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam is provided, reliably can give the alarm rapidly when there is free dredging flow, reduce to reach or avoid economic loss and safeguard the object that dam safety runs.
The technical solution adopted in the present invention is: the float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam, is characterized in that: it includes control loop and alarm circuit; Wherein control loop comprises relay, control loop power supply, and be vertically fixed on Overflow Section to be measured or close on monolith upstream dam facing and realize the float switch of break-make according to upper storage reservoir upstream water level, described control loop power supply one end is wherein electrically connected one end with relay coil, is electrically connected after other end series connection float switch with the relay coil other end; Described alarm circuit comprises alarm circuit power supply, and this power supply one end is electrically connected with one of them contact reed of relay, is electrically connected to another contact reed of relay after other end series connection warning device.
Described float switch comprises the steel water level pipe being vertically fixed on Overflow Section to be measured or closing on monolith upstream dam facing, the triggering telegraph key be fixedly installed in this water level pipe, and can be freely up and down movable thus control the float triggering telegraph key break-make in water level pipe; Wherein trigger telegraph key and be positioned at more than overflow elevation, its two ends are electrically connected with control loop power positive cathode respectively; Float is positioned at and triggers below telegraph key, and water level pipe bottom is provided with the detachable small opening lid for preventing float from dropping in pipe.
Described triggering telegraph key comprises the hollow housing be coaxially fixed on water level pipe inwall, a support is integrally shaped with in this housing, this support is fixed with in cantilever fashion the corresponding shell fragment of upper and lower two panels, and two shell fragments are electrically connected with control loop power positive cathode respectively, housing bottom end face are provided with and can freely up and down slide under float effect, to control the push rod of two shell fragment foldings.
Described push rod comprise coaxially arranged on the end face of housing bottom the body of rod, these body of rod two ends are respectively equipped with and prevent its upper limit dish come off from housing and lower limit dish, and wherein upper limit panel surface is equipped with the striker corresponding with shell fragment.
Described water level pipe bottom is the water inlet segment having one group of boring, and its length is 20cm, and percentage of open area is not less than 20%.
Described water level pipe top exceeds dam crest face 10cm, and mouth of pipe place is provided with conical blast cap.
Described warning device is made up of the sound and light alarm module and SMS module sealing in alarm circuit after parallel with one another.
Described control loop power supply and alarm circuit power supply are by transformer and the rectification circuit composition being connected to its output terminal, and it exports the direct current for being less than or equal to 36V.
Described rectification circuit output end is parallel with lithium battery group.
Described transformer comprises a primary coil and two secondary coils, and wherein primary coil connects 220V alternating current, and two secondary coils are electrically connected with two rectification circuits respectively.
The invention has the beneficial effects as follows: 1, consider from security standpoint, the spring copper sheet triggered in telegraph key directly should not carry the working current of warning device, therefore telegraph key will be triggered and warning device designs in two independent loops (control loop and alarm circuit), two loops are contacted by electromagnetic relay, wherein trigger the loop at telegraph key place as the input circuit (control loop) of electromagnetic relay, the loop at warning device place is as the output loop (alarm circuit) of electromagnetic relay; When hydroenergy storage station upper storage reservoir upstream water level reaches overflow elevation, in water level pipe, float rises with intraluminal fluid face and the push rod of jack-up triggering telegraph key, promote two panels shell fragment to contact with each other, float switch closes, control loop conducting, electromagnetic relay work is conducting alarm circuit then, warning is sent in modes such as sound, light, notes, field personnel or the far-end responsible official that is correlated with is reminded to stop pumping, compared to prior art, its feedback is more rapidly reliable, thus reduces or avoid economic loss and safeguard that dam safety runs.2, when upper storage reservoir upstream water level is down to below overflow elevation, in water level pipe, float declines with intraluminal fluid face, and the push rod triggering telegraph key glides by Gravitative Loads, two panels shell fragment separates immediately, and control loop disconnects, and electromagnetic relay two contact reed are separated, alarm circuit disconnects, and reports to the police and stops; Under this state (non-alarm condition), two loops all disconnect, and therefore power consumption is few.3, two ring current output terminals are all parallel with lithium battery group, as standby power supply, ensure that the normal work of device in non-transformer situation.
Accompanying drawing explanation
Fig. 1 is in-site installation schematic diagram of the present invention.
Fig. 2 triggers telegraph key structural drawing in the present invention.
Fig. 3 is that the A-A of Fig. 1 is to sectional view.
Fig. 4 is that the B-B of Fig. 1 is to sectional view.
Fig. 5 is that the C-C of Fig. 1 is to sectional view.
Fig. 6 is the structural drawing of push rod in the present invention.
Fig. 7 is circuit theory schematic diagram of the present invention.
Embodiment
As shown in Fig. 1-Fig. 7, the present embodiment includes separate control loop and alarm circuit; Wherein control loop comprises relay 1, control loop power supply 2, and be vertically fixed on Overflow Section to be measured or close on monolith upstream dam facing, for monitoring the float switch 3 of upstream water level, described control loop power supply 2 one end is wherein electrically connected one end with relay 1 coil, is electrically connected after other end series connection float switch 3 with the relay 1 coil other end; Described alarm circuit comprises alarm circuit power supply 4, and this power supply one end is electrically connected with one of them contact reed of relay 1, is electrically connected to another contact reed of relay 1 after other end series connection warning device; The output of described control loop power supply 2 and alarm circuit power supply 4 is for being less than or equal to the direct current of 36V.
Described float switch 3 comprises the steel water level pipe 3-1 being vertically fixed on Overflow Section to be measured or closing on monolith upstream dam facing, the triggering telegraph key 3-2 be fixedly installed in this water level pipe, and is placed in the float 3-3 in this water level pipe; Described triggering telegraph key 3-2 is positioned at more than overflow elevation, and its two ends are electrically connected with control loop power supply 2 both positive and negative polarity respectively; Float 3-3 is positioned at and triggers below telegraph key 3-2, can be freely up and down movable according to water level in pipe, to control the break-make triggering telegraph key 3-2.
In this example, described water level pipe 3-1 is standard DN65 coating steel pipe (external diameter 76mm, internal diameter 68mm, wall thickness 4mm), vertically be fixed on Overflow Section to be measured or close on the upstream dam facing of monolith, its bottom is positioned at below overflow elevation about 70cm, and top exceeds dam crest face 10cm; Water level pipe 3-1 top is run, and play and cut down the effect of storehouse water wave on water level impact in pipe, bottom is the water inlet segment having one group of boring, and its length is 20cm, and percentage of open area is not less than 20%(area ratio), be beneficial to into water; Water level pipe 3-1 bottom is provided with detachable small opening lid 3-4, prevents managing interior float 3-3 and drops at the bottom of pipe, simultaneously can silt in vent pipe or dirt.In order to prevent rainwater and foreign material from falling in water level pipe 3-1, mouth of pipe place, top is provided with conical blast cap 5.
Described float 3-3 is stainless steel or plastics shell hollow sealing spheroid, external diameter 60mm, and surfacing is smooth, can be freely up and down movable in water level pipe 3-1.
Described triggering telegraph key 3-2 comprises the hollow housing 3-2-1 be coaxially fixed on by bolt on water level pipe 3-1 inwall, a support 3-2-2 is integrally shaped with in this housing, this support is fixed with in cantilever fashion the shell fragment 3-2-3 that upper and lower two panels is corresponding, and two shell fragment 3-2-3 are electrically connected with control loop power supply 2 both positive and negative polarity respectively, housing 3-2-1 bottom end face is provided with push rod 3-2-4, freely up and down can slide under float 3-3 effect, thus control the folding of two shell fragment 3-2-3, realize the break-make of control loop.Described housing 3-2-1 is plastic material cylindrical cavity structure, external diameter 68mm, cavity inside diameter 60mm, side thickness 4mm; Upper base thickness of slab 5mm, bores 3
air hole 9 and 1
cable outlet hole 10; Go to the bottom thickness of slab 20mm, and corresponding upper plate air hole position bores 3 equally
air hole 9(be used for balance pipe internal gas pressure), separately bore 1 at lower shoe circle centre position
push rod sliding eye 11.Two panels shell fragment 3-2-3 is arranged side by side up and down, and vertical interval is about 3mm, and every sheet shell fragment 3-2-3 welds a cable, draws the both positive and negative polarity being connected to control loop power supply 2 respectively from cable outlet hole 10.
Described push rod 3-2-4 comprises body of rod 3-2-5, upper limit dish 3-2-6, lower limit dish 3-2-7 and striker 3-2-8, and wherein body of rod 3-2-5, upper limit dish 3-2-6, lower limit dish 3-2-7 are plastic material; Wherein body of rod 3-2-5 diameter 10mm, long 27mm, is coaxially installed in the push rod sliding eye 11 on housing 3-2-1 lower shoe, and can be free to slide in this sliding eye; Upper limit dish 3-2-6 diameter 20mm, thick 3mm, lower limit dish 3-2-7 diameter 50mm, thick 3mm, comes off from housing 3-2-1 lower shoe for preventing body of rod 3-2-5; Striker 3-2-8 is copper cone, basal diameter 5mm, high 10mm.
Whole triggering telegraph key 3-2 is fixed in water level pipe 3-1 by two M8 × 20 bolts, and concrete Installation Elevation is calculated as follows: when spheroid float 3-3 floats in water, and its deadweight and buoyant equilibrium, make float quality be m, and it is highly h that float submerges in water, then have
In formula, ρ is the density of water, gets 1.0 × 10
3kg/m
3; G is acceleration of gravity; D is float external diameter, and this example is 60mm.Substitute into data and can solve h.When water level reaches overflow elevation H
overflowtime, float 3-3 end face should give the alarm with closed circuit by complete jack-up push rod 3-2-4 just, therefore triggers telegraph key 3-2 bottom surface elevation H
open closewith float 3-3 end face now with high, namely should have
Described warning device comprises the on-the-spot sound and light alarm of sound and light alarm module 6() and SMS module 7(remote short messages notice), be connected serially in alarm circuit after both parallel connections.
Described control loop power supply 2 and alarm circuit power supply 4 are by transformer and the rectification circuit composition being connected to its output terminal, and it exports the direct current for being less than or equal to 36V.In this example, described transformer comprises a primary coil and two secondary coils, the wherein external 220V alternating current of primary coil, two secondary coils are electrically connected with two rectification circuits of control loop power supply 2 and alarm circuit power supply 4 respectively, and the output terminal of each rectification circuit is all parallel with lithium battery group 8; Now the mode of operation of two ring currents can be divided into external power supply and internal cell (lithium battery group) to power two kinds, wherein external power supply is provided by civil power (AC220V), by exporting the direct current for fixed voltage (≤36V) after transformer and rectification circuit; Internal battery powers utilizes lithium battery group 8 to have repeatedly can to carry out discharge and recharge operation and almost memory-less effect feature, after being connected in parallel on the output terminal of rectification circuit, for control loop and alarm circuit provide interim standby power supply.Two kinds of working mode change are as follows: when external confession electric connection, civil power for whole circuit provides working power, charges to lithium battery group 8 after step-down rectifier simultaneously; When external power supply open circuit, lithium battery group 8 transfers discharge mode to automatically, and bear the effect of powering for whole circuit, storing electricity can make device continue more than warning 2h.Because this device inner two loops when not reporting to the police all are in off state, therefore per day consumption electric energy is few.
This routine detector and alarm also comprises the eminence that an electric box 12(is positioned at more than dam crest, and by the padded 5cm of support), described relay 1, control loop power supply 2, alarm circuit power supply 4 and SMS module 7 are all arranged in this electric box, and it is outside that sound and light alarm module 6 is positioned at this electric box; The both positive and negative polarity cable of control loop power supply 2 extends outside through after this electric box, is electrically connected respectively with two panels shell fragment 3-2-3.
The principle of work of the present embodiment is: when hydroenergy storage station upper storage reservoir upstream water level reaches overflow elevation, in water level pipe 3-1, liquid level synchronously rises, float 3-3 rises with water level simultaneously, the push rod 3-2-4 jack-up of telegraph key will be triggered, promote two panels shell fragment 3-2-3 to contact with each other, float switch 3 closes, control loop conducting, electromagnetic relay 1 works conducting alarm circuit then, sound and light alarm module 6 and SMS module 7 work, send warning in modes such as sound, light, notes, remind field personnel or the far-end responsible official that is correlated with to stop pumping.Otherwise, when hydroenergy storage station upper storage reservoir upstream water level is down to below overflow elevation, float 3-3 declines with water level, the push rod 3-2-4 triggering telegraph key glides under self gravitation effect, two panels shell fragment 3-2-3 separates immediately, and control loop disconnects, and electromagnetic relay 1 two contact reed are separated, alarm circuit disconnects, and reports to the police and stops.
Claims (7)
1. a float switch formula free dredging flow detector and alarm for hydroenergy storage station upper storage reservoir dam, is characterized in that: it includes control loop and alarm circuit; Wherein control loop comprises relay (1), control loop power supply (2), and be vertically fixed on Overflow Section to be measured or close on monolith upstream dam facing and realize the float switch (3) of break-make according to upper storage reservoir upstream water level, described control loop power supply (2) one end is wherein electrically connected one end with relay (1) coil, and other end series connection float switch (3) is electrically connected with relay (1) the coil other end afterwards; Described alarm circuit comprises alarm circuit power supply (4), and this power supply one end is electrically connected with one of them contact reed of relay (1), is electrically connected to another contact reed of relay (1) after other end series connection warning device;
Described float switch (3) comprises the steel water level pipe (3-1) being vertically fixed on Overflow Section to be measured or closing on monolith upstream dam facing, the triggering telegraph key (3-2) be fixedly installed in this water level pipe, and can be freely up and down movable thus control the float (3-3) triggering telegraph key (3-2) break-make in water level pipe (3-1); Wherein trigger telegraph key (3-2) and be positioned at more than overflow elevation, its two ends are electrically connected with control loop power supply (2) both positive and negative polarity respectively; Float (3-3) is positioned at and triggers telegraph key (3-2) below, and water level pipe (3-1) bottom is provided with the detachable small opening lid (3-4) for preventing float (3-3) from dropping in pipe;
Described triggering telegraph key (3-2) comprises the hollow housing (3-2-1) be coaxially fixed on water level pipe (3-1) inwall, a support (3-2-2) is integrally shaped with in this housing, this support is fixed with in cantilever fashion the corresponding shell fragment of upper and lower two panels (3-2-3), and two shell fragments (3-2-3) are electrically connected with control loop power supply (2) both positive and negative polarity respectively, housing (3-2-1) bottom end face are provided with and freely up and down can slide, to control the push rod (3-2-4) of two shell fragments (3-2-3) folding under float (3-3) effect;
Described push rod (3-2-4) comprise coaxially arranged on the end face of housing (3-2-1) bottom the body of rod (3-2-5), these body of rod two ends are respectively equipped with and prevent its upper limit dish (3-2-6) come off from housing (3-2-1) and lower limit dish (3-2-7), and wherein the striker (3-2-8) corresponding with shell fragment (3-2-3) is equipped with on upper limit dish (3-2-6) surface.
2. the float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam according to claim 1, it is characterized in that: described water level pipe (3-1) bottom is the water inlet segment having one group of boring, its length is 20cm, and percentage of open area is not less than 20%.
3. the float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam according to claim 1, it is characterized in that: described water level pipe (3-1) top exceeds dam crest face 10cm, and mouth of pipe place is provided with conical blast cap (5).
4. the float switch formula free dredging flow detector and alarm of the hydroenergy storage station upper storage reservoir dam according to claim 1 or 2 or 3, is characterized in that: described warning device is made up of the sound and light alarm module (6) and SMS module (7) sealing in alarm circuit after parallel with one another.
5. the float switch formula free dredging flow detector and alarm of the hydroenergy storage station upper storage reservoir dam according to claim 1 or 2 or 3, it is characterized in that: described control loop power supply (2) and alarm circuit power supply (4) are by transformer and the rectification circuit composition being connected to its output terminal, and it exports the direct current for being less than or equal to 36V.
6. the float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam according to claim 5, is characterized in that: described rectification circuit output end is parallel with lithium battery group (8).
7. the float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam according to claim 6, it is characterized in that: described transformer comprises a primary coil and two secondary coils, wherein primary coil connects 220V alternating current, and two secondary coils are electrically connected with two rectification circuits respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310079818.2A CN103196521B (en) | 2013-03-13 | 2013-03-13 | The float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310079818.2A CN103196521B (en) | 2013-03-13 | 2013-03-13 | The float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103196521A CN103196521A (en) | 2013-07-10 |
| CN103196521B true CN103196521B (en) | 2015-11-18 |
Family
ID=48719221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310079818.2A Expired - Fee Related CN103196521B (en) | 2013-03-13 | 2013-03-13 | The float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103196521B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318108A (en) * | 2018-02-23 | 2018-07-24 | 朱艳青 | A kind of water level electric controling switch |
| CN111076860B (en) * | 2019-12-26 | 2021-03-12 | 云南农业大学 | Repairable piezometric tube |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200990340Y (en) * | 2005-07-14 | 2007-12-12 | 张晓坤 | Submensible automatic liquid level switch |
| CN201635766U (en) * | 2010-03-05 | 2010-11-17 | 潘如春 | Automatic switch for roadway drainage |
| CN201943078U (en) * | 2010-12-20 | 2011-08-24 | 歌山建设集团有限公司 | Unmanned dewatering pump for tube well |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060208915A1 (en) * | 2005-03-09 | 2006-09-21 | Stuart Oakner | Liquid level sensor switch |
-
2013
- 2013-03-13 CN CN201310079818.2A patent/CN103196521B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200990340Y (en) * | 2005-07-14 | 2007-12-12 | 张晓坤 | Submensible automatic liquid level switch |
| CN201635766U (en) * | 2010-03-05 | 2010-11-17 | 潘如春 | Automatic switch for roadway drainage |
| CN201943078U (en) * | 2010-12-20 | 2011-08-24 | 歌山建设集团有限公司 | Unmanned dewatering pump for tube well |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103196521A (en) | 2013-07-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109900343A (en) | A kind of energy-saving water level monitoring device of hydraulic engineering | |
| CN110207761A (en) | Sponge city intelligent monitors system | |
| CN205861167U (en) | A kind of river level monitoring broadcast alarm device | |
| CN103196521B (en) | The float switch formula free dredging flow detector and alarm of hydroenergy storage station upper storage reservoir dam | |
| CN211121503U (en) | Water level monitoring device for hydraulic engineering | |
| CN202814509U (en) | Water level monitoring device of water tank | |
| CN204241615U (en) | A kind of solar energy charging type fault detector | |
| CN207717192U (en) | The out-of-limit automatic inspection warning device of hydroenergy storage station reservoir | |
| CN203241112U (en) | Electrode switch type free aerial drainage observing and predicting device of reservoir dam on pumped storage power station | |
| CN204988421U (en) | Electronic type water level alarm | |
| CN205787824U (en) | A kind of anti-theft type water resource supervising device | |
| CN206470919U (en) | Mud-rock flow three-level precaution device and debris flow early-warning system | |
| CN104950931A (en) | Water tank liquid level monitoring device | |
| CN204388976U (en) | A kind of flood control alarm | |
| CN211651766U (en) | Water level monitoring device for hydraulic engineering | |
| CN108761007A (en) | A kind of water quality indicator buoy | |
| CN211577381U (en) | Wading electric leakage alarm device for outdoor floor power distribution equipment | |
| CN204740505U (en) | Low -cost detection of water level warning circuit | |
| CN200993593Y (en) | Water level monitor | |
| CN202486260U (en) | Line fault indicator | |
| CN106886062A (en) | Rainfall remote alarming device | |
| CN215064733U (en) | Self-generating remote water level early warning signal transmitting device controlled by floating body | |
| CN104977061A (en) | Electrode type water level alarming system | |
| CN204730911U (en) | Water tank high-low water alarm system | |
| CN213180237U (en) | Water level monitoring alarm device for hydraulic engineering |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |