Liquid crystal and the two remote transmitting water meters that show of machinery
The utility model relates to a kind of device of measuring water flow.
It is small-bore that (15~40mm) rotor water gauges are widely used in covil construction and the water supply project, whether be immersed in the tested water by its counter and can be divided into wet type, dry type and liquid-seal type, although its inner structure is updated, technical feature improves constantly, and fundamental mode table to 7 bit pointer that adds combined vane wheel type comprising 7 bit pointers adds the A type table of integral wheel formula; 8 bit pointers add the Type B table of combined vane wheel type, and 8 bit pointers add the C type table of integral wheel formula, and pointer adds the E type table of character wheel formula etc., but all belong to mechanical drive mode, and its technical feature can not satisfy customer requirements.For wet-type meter, though simple in structure, sensitivity is higher, because counter is under water, dial plate is easily piled up the sediment in the water, influences reading, and gear and character wheel are easily blocked by foreign matter, the influence metering.For dry-type meter, because seal shaft friction force is big, poor sensitivity, leakiness water erosion dial, and complex structure and passed water meter by magnetic and eliminate.Magnetic passes water meter and is made up of upper and lower two magnet steel, because it is asynchronous to occur rotation when the flow cataclysm, and top magnet steel (magnetic central gear) be subject to the external magnetic field in disturbing, the influence metering, therefore E type table continue C type table after and dry type magnetic pass that water meter is whole fails to replace C type table because of inadequate natural endowment.
Japan is contained in permanent magnet on the impeller shaft with the gear and the simulated pointer of novel Magnetic Sensor MP element replacement mechanical water meter, constitutes the electronic water meter that volume is little, reliability is high (seeing yellow just " electronics Leader ", on June 9th, 1992).Electronic water meter is made up of mechanical part and circuit part.Mechanical part comprises housing, impeller, impeller box and magnet steel.Circuit part comprises Magnetic Sensor, amplifier and counting display circuit etc.The power consumption of above-mentioned electronic water meter is bigger than normal, and sensitivity is lower, has the impeller jitter phenomenon.
The CN93201747.9 patent provides a kind of circuit voltage low, the power consumptive province, and sensitivity is higher, and the impeller shake is little, adopts the liquid crystal display electron water meter of Hall element as sensor.But be not easy to the monitoring of user to meter reading.
The purpose of this utility model is to provide a kind of liquid crystal and the two remote transmitting water meters that show of machinery that has mechanical indicator demonstration and teletransmission liquid crystal display dual-use function simultaneously.
Basic technical scheme of the present utility model is the sensing meter that improves water meter, and it is by forming through improved traditional mechanical water meter turbine gear transmission structure, mechanical display structure and contactless sensing probe etc.Transform original structure in traditional LXS series and LXSG series water meter, set up the magnetic sensing element, the magnetic sensing element is installed on water meter and is on the service part of static state, and magnet steel then is installed on water meter and is on the dynamic metering unit.The signal wire of sensing element is along above-mentioned work, metering unit, O-ring seal, lead-in wire cover and watch glass outer rim drawing-off water watch glasses.Water meter when work, through wheel rotation, driven gear work and produce mechanical indicator and show reading and teletransmission liquid crystal display reading.
The utility model comprises watchcase, gearcase, supporting plate, train wheel bridge assembly, dial, watch glass, table lid, gear set, lower plate, impeller box, impeller, current adjustable plate, screen pack, pointer and the sealing O circle etc. of existing water meter, the both sides of watchcase are pipe adapter, gearcase is positioned at watchcase, gear set is between train wheel bridge assembly and lower plate, supporting plate is connected to the bottom surface of lower plate, and gear set, train wheel bridge assembly, lower plate and supporting plate place in the gearcase.Dial places the train wheel bridge upper surface, pointer on the dial is connected with gear set, and impeller passes the main drive gear bridle joint of impeller box bottom centre hole and gear set, and impeller is positioned at impeller box, the current adjustable plate is located at impeller box bottom outer bottom, and filtering screen is in the impeller box bottom.Watch glass places the dial top, and the table lid places the watch glass top.
Establish a grooving of placing the sensing element lining at the bottom surface of gearcase lower plate, establish sensing element lead-in wire groove from grooving one end along the bottom surface of lower plate, establish notch in the bottom surface junction of lead-in wire groove and lower plate.Establish the feet wire casing in the train wheel bridge bottom of train wheel bridge assembly and the feet outside between the lower plate, establish the impeller box wire casing, on the sealing O circle between impeller box port and train wheel bridge assembly and the watch glass, also establish wire casing in impeller box upper port inboard.On watch glass, establish ring-type lead-in wire cover, be positioned at impeller box wire casing place in lead-in wire collar side and establish fairlead, the sensing element signal wire passes sensing element lead-in wire groove and the feet wire casing between notch, train wheel bridge bottom and the lower plate, impeller box wire casing, sealing O astragal groove and the lead-in wire cover fairlead of lower plate bottom surface.Outer cover covers in the outer rim side of lead-in wire cover, and utilizes internal thread and watchcase to fix, and table is covered on the top of lead-in wire cover.At the magnet steel of establishing on gear wheel face or the impeller more than 2 or 2.Sensing element adopts Hall element.
Feet wire casing, impeller box wire casing between sensing element lead-in wire notch, train wheel bridge bottom and the lower plate of lower plate bottom surface preferably are made as 3 wire casings, so that embed 3 signal line of sensing element.Magnet steel preferably is arranged near on the gear wheel face of lower plate, and the magnetic field intensity of magnet steel is elected 800~1500 Gausses as, is good with 1200~1500 Gausses.
The external teletransmission liquid crystal display circuit of sensing element signal wire parts.Usually, teletransmission circuit and the parts circuit that can be adopted as above-mentioned CN93201749.9 patent " liquid crystal display electron water meter "; It comprises testing circuit, counting display circuit and power supply.Testing circuit is by oscillatory circuit, the waveform transformation circuit, the shaping buffer circuit, phase inverter, the sensor output signal filtering circuit, shaping circuit, pulse width modulation circuit, demodulation trigger circuit and 2 frequency dividing circuits are formed, the square-wave signal of oscillatory circuit output 80~130Hz is through the waveform transformation circuit, shaping buffer circuit output pulse duration ratio is sent phase inverter and hall sensor respectively greater than 800 burst pulse, the output pulse signal of hall sensor device is through the sensor output signal filtering circuit, square wave behind shaping circuit and the pulse width modulation circuit and the output signal of phase inverter input demodulation trigger circuit export the counting display circuit to through 2 frequency dividing circuits again.Belong to counting display circuit commonly used and comprise the capable decade counter of 8 bit serials, high 4 with low 4 digit selectors, latch, decoding, LCD driver radix point driver, the clear circuit that powers on, 2 frequency dividing circuits, LCDs and button.
The utility model in conjunction with the teletransmission characteristic of liquid crystal display electron water meter, improves structure on the basis of existing mechanical type water meter, and sensing element is installed on the bottom surface of the service part lower plate that is static in the water meter, by supporting plate fixed support in addition, difficult drop-off; Magnet steel then is installed on and is in the water meter on the dynamic metering unit gear wheel face, and designed dexterously the sensing element signal wire the position, move towards and draw way.Like this, during water meter work, mechanical indicator on the dial and teletransmission liquid crystal show its reading simultaneously, are convenient to the user's inspection and the person of checking meter and check meter.Compare with existing water meter and also to have following advantage:
1. the magnetic sensing element is away from the water meter surface, and diamagnetic strong in the power of disturbing.
2. do not change watch glass physical dimension and intensity.
3. the outward appearance of the total indicator reading of water meter, water meter is similar to existing water meter, and the reading sight line is not obstructed, and inspection is convenient, holds susceptible to user acceptance than simple teletransmission liquid crystal display electron water meter.
4. various components and parts good concealment, signal lead is fixed, sealing, the fastening lead-in wire that is positioned at puts, and is solid and reliable, is not easy to be broken.Signal lead encloses three wire casings in the sealing of watch glass direct draught along the lower plate outside three wire casings, gearcase and sealing O, through the test down of 2MPa pressure, favorable sealing property.
5. show to cover positioning and fixing and put, do not change the position, overcome existing Water meter cover with any drop point of outer cover and the loosening defective that covers generation with copper outer cover rotation at lead-in wire.
6. the product line applicability is good, pressing water meter nominal bore divides, small-bore 15,20,25,40 and the two apparent water meters of 5 kinds of models such as heavy caliber 50, can adopt parts in addition such as indicating mechanism's (comprising lower plate, supporting plate, gear, pointer, dial), the watch glass O RunddichtringO of same dimensions, the cover that goes between, outer cover liner, table lid, highly versatile.For the two tables that show of models such as heavy caliber 80,100,150, magnet steel is selected on the 4th the major axis gear teeth face, and sensor still places the lower plate bottom surface.If the teletransmission liquid crystal display circuit adopts Single Chip Microcomputer (SCM) system, then can carry out the management of water meter counting cost by gas meter unified calculation machine simultaneously.
Fig. 1 is a structural drawing of the present utility model.
Fig. 2 is a lower plate bottom surface structural drawing.
Fig. 3 is the train wheel bridge bottom of train wheel bridge assembly and the feet wire casing synoptic diagram between the lower plate.
Fig. 4 is lead-in wire cover fairlead synoptic diagram.
Fig. 5 is a water meter teletransmission display circuit part block scheme.
Fig. 6 is a water meter teletransmission display circuit part schematic diagram.
Embodiment: as shown in Figure 1, the utility model comprises watchcase (1), gearcase (2), supporting plate (3), embedding formula sensing element lining (4), train wheel bridge assembly (5), dial (6), watch glass (7), impeller box (8), sensing element signal wire (9), lead-in wire cover (10), table lid (11), magnet steel (12), sensing element (13), gear set (14), outer cover (15), lower plate (16), impeller (17), screen pack (18), pointer (19), sealing O circle (20) and current adjustable plate etc.The both sides of watchcase (1) are pipe adapter, gearcase (2) etc. is positioned at watchcase, the structure of gearcase (2), supporting plate (3), train wheel bridge assembly (5), dial (6), watch glass (7), impeller box (8), gear set (14), impeller (17), screen pack (18), pointer (19) and current adjustable plate etc. be connected similar or identical to existing mechanical type water meter.Referring to Fig. 2, establish the grooving (162) of a placement sensing element lining at the bottom surface (161) of lower plate (16), bottom surface (161) from grooving (162) one ends along lower plate is established sensing element lead-in wire groove (163), establishes notch (164) in the lead-in wire groove (163) and bottom surface (161) junction of lower plate.Referring to Fig. 3, establish feet wire casing (53) in train wheel bridge (51) bottom of train wheel bridge assembly (5) and feet (52) outside between the lower plate (16).Establish the impeller box wire casing in impeller box (8) upper port inboard, on the circle of the sealing O between impeller box (8) port and train wheel bridge assembly (5) and the watch glass (7) (20), also establish wire casing.Referring to Fig. 4, ring-type lead-in wire cover (10) places on the watch glass (7), establishes fairlead (101,102) at lead-in wire cover (10) ring side position in impeller box wire casing place.The fairlead (101 that overlaps from lead-in wire behind feet wire casing (53), sealing O astragal groove and the impeller box wire casing between the sensing element lead-in wire groove (163) that sensing element signal wire (9) passes the lower plate bottom surface and notch (164), train wheel bridge bottom and the lower plate, 102) draw, and the testing circuit of external teletransmission display circuit part.Outer cover (15) covers in the outer rim side of lead-in wire cover (10), and utilizes its internal thread and watchcase to fix.Table lid (11) is positioned at the top of lead-in wire cover (10), table lid (11) is connected in joining on the Gai Zhu (103) of lead-in wire cover (10) outer shroud upper end, join and establish tip hole (104) on the Gai Zhu (103), establish table lid location clamping slot (105) in the lead-in wire cover outer shroud upper end on opposite, tip hole (104).2 blocks of magnet steel (12) place arbitrary position gear or impeller on, on the wheel face of first excellent No. 5 or No. 155 major axis gears, its magnetic field intensity is 1200~1500 Gausses.Sensing element adopts Hall element, places embedding formula sensing element lining (4).
Notch (164), feet wire casing (53), sealing O astragal groove and impeller box wire casing all are set to 3 wire casings.
As shown in Figure 5, circuit part comprises testing circuit, counting display circuit and power supply.Testing circuit comprises oscillatory circuit (21), waveform transformation circuit (22), shaping buffer circuit (23), sensor output signal filtering circuit (24), shaping circuit (25), phase inverter (26), pulse width modulation circuit (27), demodulation trigger circuit (28) and 2 frequency dividing circuits (29).The counting display circuit comprise the capable decade counter of 8 bit serials (30), high 4 latch with seven sections of low 4 digit selectors (31), selector button (32), 4 BCD-, decoding, LCD driver (33), demonstration and blanking selector button (34), the clear circuit that powers on (39), radix point driver (40), 2 frequency dividing circuits (41) and 4 LCDs (42).
The effect of testing circuit is that to produce a succession of frequency be 80~130Hz, and pulse duration ratio is greater than 800 the burst pulse power supply at intermittence as Hall switch.As shown in Figure 6,12 of Schmidt trigger MC 14584,13 pin and R
1, C
1Form pierce circuit, 3~6 pin and R
2, C
2Form the waveform transformation circuit, the burst pulse of generation is through the intermittence power supply of buffering as Hall switch CS3020.Under the effect of magnet steel, the output terminal of Hall switch has, does not have the consecutive pulse.This pulse is through filtering circuit (R
3, R
4, C
3), shaping circuit (11,10 pin of six schmitt inverter MC14584) and pulse width modulation circuit (R
5, C
4, D and MC14584 9,8 pin), separate through d type flip flop again and be in harmonious proportion behind 2 frequency dividing circuits (two D flip-flop MC14013), draw the magnet steel d type flip flop Q end that circles and change once, promptly export an electric pulse.When like this, just original Hall switch directly being added the 3V power supply working current 4mA reduce to add testing circuit (comprising Hall switch) behind the power supply intermittently working current less than 5uA.Be to strengthen driving force, the Schmidt circuit shown in the shaping buffer circuit is by 33 schmitt inverters be formed in parallel (MC14584).
The counting display circuit is done the accumulation that magnet steel rotates the number of turns by 8 decimal system serial counters (two BCD add counter MC14518 * 4), by selected on-off circuit (four with selector switch MC14019 * 4), select high 4 or low 4 to latch, decipher, drive 4 liquid crystal displays demonstrations then.Display screen blanking at ordinary times when the needs video data, is just pressed demonstration and blanking selector button K
1, K among the figure
2Be high 4 and low 4 digit selector selector buttons, MC14543 * 4 are formed 4 BCD-and are latched/decipher/LCD driver for seven sections.The radix point driver is with 42 input end rejection gate MC14001 and four XOR gate MC14070.The clear circuit that powers on is made up of the RC charge-discharge circuit.
The technical parameter of foregoing circuit is as follows:
1. circuit voltage scope: V
DD=2.4~3.5V
2. circuit working electric current: I≤10uA; Work as V
DDDuring=3V, I≤10uA; Work as V
DDDuring=3.5V, I≤15uA.
3. oscillatory circuit frequency of operation: f
1=80~130Hz; The frequency of tested vibration magnet steel: f
2=0~40Hz.
4. Gui Ding normal value: V
DH〉=(V
DD-0.05V); V
OL≤ (V
SS+ 0.05V).
Liquid crystal is that 2.4V~3.5V can normally show at voltage, and the liquid crystal drive mode is static scanning output.
During work, after water flows into water meter, utilize water speed to promote the impeller rotation, produce the rectangle electric pulse through contactless magnetic sensor elements and be input to circuit, LCDs accumulative total demonstrates the volume total amount of the water of the water meter of flowing through.