A kind of gas meter, flow meter seals assay device
(1) technical field
This utility model relates to tap water facility field, seals assay device particularly to a kind of gas meter, flow meter.
(2) background technology
Along with natural gas is widely used in daily life, gas meter, flow meter has come into huge numbers of families.Natural gas is the most inflammable,
If gas meter, flow meter is revealed, consequence is hardly imaginable, and therefore for the accuracy of gas meter, flow meter, its safety is more attached most importance to
The bubble-tight method of instrumentation typically uses pressure method of changing: gas meter, flow meter is snapped in gas meter, flow meter fixture, with one
Small-power air pump, as source of the gas, is used stop valve to close closed loop, uses one piece of digital pressure gauge, pressed by observation
The change in value of power table judges whether gas meter, flow meter leaks, and its principle is off valve, gas meter, flow meter, digital pressure gauge constitute airtight time
Road, source of the gas injects closed loop through the stop valve opened, now observes the numerical value that Pressure gauge shows, reach rapid during predetermined value
Close stop valve, observe digital pressure gauge 3 minutes, whether decline with its indicating value shown and judge whether gas meter, flow meter leaks.Above-mentioned
Precision of method is low, and intelligence degree is low, specifically has the drawback that: first, and the common stop valve of use needs manually to pull
Stop valve control its folding with give detection device pressurization, operate more tired, efficiency is low；Secondly, stop valve is after switch repeatedly
Easily close not in place, cause intrinsic pressure the insisting on of gas circuit to continue rising；3rd, during manual pressure, the bad control of air inflow, is embodied in valve
The size opened and the bad control of time length of unlatching, valve is opened too small, and pressure process is just lost time, and opens excessive,
Often beyond predetermined value, cause overvoltage, easily damage and picked up gas meter, flow meter；4th, digital pressure gauge resolution is low, for gas meter, flow meter
Minute leakage insensitive, easily cause erroneous judgement；5th different manufacturers, different size model gas meter, flow meter is suitable for reading and between end opening away from
From there are differences, to constantly adjust the distance between the hold down gag of fixture and base, calibrating requirement could be met.
(3) summary of the invention
This utility model is in order to make up the defect of prior art, it is provided that the combustion that a kind of automaticity is high, accuracy is high
Gas meter seals assay device.
This utility model is achieved by the following technical solution:
A kind of gas meter, flow meter seals assay device, it is characterized in that, including PLC control system and the pressuring pump that connected by pipeline
With total pneumatic operated valve, described total pneumatic operated valve is provided with gross pressure table transmitter, described total pneumatic operated valve connect respectively left working cell and
Right working cell, described left working cell is identical with right working cell structure, all includes: main pipe rail, and described main pipe rail connects respectively
Connect master meter branch road and some tested table branch roads, be wherein sequentially provided with the first pneumatic operated valve, the first master meter on master meter branch road even
Joint, the second master meter union joint and the second pneumatic operated valve, between described first master meter union joint and the second master meter union joint
Connecting master meter, the pipeline between described first pneumatic operated valve and the first master meter union joint is provided with pressure transmitter；Described quilt
Inspection table branch road includes: connect the first tested table union joint after the 3rd pneumatic operated valve and differential pressure transmitter parallel connection, and the first tested table connects
Head connects the second tested table union joint by tested table, and described second tested table union joint connects the 4th pneumatic operated valve.
The beneficial effects of the utility model are:
This utility model simple in construction, quick detachable, easily carry, and by being accurately obtained with the contrast of master meter
Verification result, can disposably carry out the calibrating of multiple tested table simultaneously, quickly, efficiently.
(4) accompanying drawing explanation
Below in conjunction with the accompanying drawings this utility model is further described:
Fig. 1 is operation principle schematic diagram of the present utility model.
In figure, 1 pressuring pump, 2 always start valve, 3 gross pressure table transmitters, 4 left working cells, 5 right working cells, 6 house stewards
Road, 7 master meter branch roads, 8 tested table branch roads, 9 first pneumatic operated valves, 10 first master meter union joints, 11 second master meter union joints,
12 master meters, 13 second pneumatic operated valves, 14 pressure transmitters, 15 the 3rd pneumatic operated valves, 16 differential pressure transmitters, 17 first tested tables connect
Head, 18 tested tables, 19 second tested table union joints, 20 the 4th pneumatic operated valves.
(5) detailed description of the invention
Accompanying drawing is specific embodiment of the utility model.As it is shown in figure 1, this kind of gas meter, flow meter seals assay device, including PLC
Control system and the pressuring pump 1 connected by pipeline and total pneumatic operated valve 2, total pneumatic operated valve 2 is provided with gross pressure table transmitter 3, always
Pneumatic operated valve 2 connects left working cell 4 and right working cell 5 respectively, and left working cell 4 and right working cell 5 are respectively used to calibrating
Left-handed watch and right table, they structures are identical, all include: main pipe rail 6, and main pipe rail 6 connects master meter branch road 7 and some tested tables respectively
Branch road 8, is wherein sequentially provided with first pneumatic operated valve the 9, first master meter union joint the 10, second master meter and connects on master meter branch road 7
11 and second pneumatic operated valve 13, connect master meter 12 between the first master meter union joint 10 and the second master meter union joint 11, the
Pipeline between one pneumatic operated valve 9 and the first master meter union joint 10 is provided with pressure transmitter 14；Each tested table branch road 8 wraps
Include: after the 3rd pneumatic operated valve 15 and differential pressure transmitter 16 parallel connection, connect the first tested table union joint 17, the first tested table union joint 17
Connecting the second tested table union joint 19 by tested table 18, the second tested table union joint 19 connects the 4th pneumatic operated valve 20, Qi Zhong
One pneumatic operated valve the 9, second pneumatic operated valve the 13, the 3rd pneumatic operated valve 15 and the 4th pneumatic operated valve 20 gas in master meter 12 or tested table 18
The emission control of body, is defaulted as conducting state, and during dry running, system carries out test run of ventilating to all master meters 12 and tested table 18
Row engages the most normal with the core section checking each table with output shaft；After dry running terminates, the second pneumatic operated valve 13 and the 4th gas
Each table is carried out pneumatic compression to authorized pressure and enters equilibrium stage by dynamic valve 20 Close All system, detection pressure transmitter prison
The most normal depending on pressure in table, if normally, at the end of balance, close the first pneumatic operated valve 9 and the 3rd pneumatic operated valve 15 enters and seals
Property detection-phase, differential pressure transmitter 16 detect the pressure reduction situation of change between each tested table 18 and master meter 12 respectively until detection
Time terminates, and detection data show in real time on the LED charactron of each table, and testing result passes through LED light output display；Close
The detection of envelope property i.e. enters exhaust phase after terminating, and the second pneumatic operated valve 13 and the 4th pneumatic operated valve 20 are fully open, by the pressure in each table
Contracting air enters air, subsequently by fully open to the first pneumatic operated valve 9 and the 3rd pneumatic operated valve 15, and system recovery original state.
In addition to technical characteristic described in description, remaining technical characteristic is all known to a person skilled in the art technology.