CN105890707A - Annular grounding device of flowmeter - Google Patents
Annular grounding device of flowmeter Download PDFInfo
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- CN105890707A CN105890707A CN201410758418.9A CN201410758418A CN105890707A CN 105890707 A CN105890707 A CN 105890707A CN 201410758418 A CN201410758418 A CN 201410758418A CN 105890707 A CN105890707 A CN 105890707A
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- grounding
- effusion meter
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Abstract
The invention discloses an annular grounding device of a flowmeter. The device comprises a flowmeter instrument box and a flowmeter sensor, a grounding device is arranged near the flowmeter sensor, actually measured grounding resistance of the grounding device is smaller than or equal to 10 ohms, and the flowmeter instrument box is connected with a grounding bus in a building; or a grounding system is additionally arranged below the ground outdoors to serve as multiple grounding of a power supply PE bar, and the grounding system comprises a first horizontal grounding body, a second horizontal grounding body, a metal tube, multiple first vertical grounding bodies connected in parallel and multiple second vertical grounding bodies connected in parallel. According to the annular grounding device of the flowmeter, flowermeter instrument power grounding and signal grounding are arranged separately, one grounding device is arranged near the flowmeter sensor, the sensor has a good separate grounding wire, and it is guaranteed that the flowmeter instrument is high in accuracy and not prone to be interfered by outside parasitic potiential.
Description
Technical field
The present invention relates to grounding device, be specifically related to a kind of effusion meter annular being connected with mounting flange metal tube for flow transducer
Grounding device.
Background technology
Electromagnetic flowmeter normally to work and certainly to want ground connection, but the when of installation on metallic conduit, because metallic conduit all has with the earth
Enough contacts, it is possible to save the way of ground connection, if being necessary for ground connection when installing on plastic conduit and liner pipe.
Electromagnetic flowmeter ground connection must simultaneously meet 2 requirements:
1., from operation principle and signal circuit analysis, the earth terminal of effusion meter must current potential same with measured medium..
2. reliable ground, with the earth as zero-bit, reduces external interference.
For making instrument reliably working, improving certainty of measurement, do not disturbed by extraneous parasitic electromotive force, sensor should have good independent grounding line,
Earth lead is not connected in the common ground of motor or miscellaneous equipment.Earth resistance < 10 Ω.
Generally process pipe is metallic conduit, inherently ground connection, if process pipe inwall scribbles insulating barrier or nonmetal pipeline,
Sensor both sides also should be equipped with ground loop.But big in the extraneous interference of electromagnetic field, when especially on pipeline, the stray electrical current such as power frequency is bigger, should be another
Row arranges grounding device.
Summary of the invention
The present invention is to solve the deficiencies in the prior art, it is provided that a kind of effusion meter ring ground.
The present invention is to realize above-mentioned purpose by following technical solution:
A kind of effusion meter ring ground, including effusion meter instrument box, flow transducer, is provided with one group and connects near described flow transducer
Ground device, the actual measurement earth resistance of described grounding device is less than or equal to 10 ohm, and described effusion meter instrument box is with earth bus in building even
Connect;In effusion meter instrument box, PE row requirement 10mm copper core plastic cord is reliably connected with earth bus in the building of instrument box place.
Or setting up one group of earthed system below outdoor ground, as the multiple grounding of power supply PE row, described earthed system includes the first water
Flush terrain, the second horizontal grounding objects, metal tube, the first Grounding Grids of some parallel connections, the second Grounding Grids of some parallel connections;
First Grounding Grids of described some parallel connections is all connected on the first horizontal grounding objects, and the first horizontal grounding objects connects flowmeter sensor and metal
Pipe, metal tube connects effusion meter instrument box, and effusion meter instrument box connects earth bus, and earth bus connects the second horizontal grounding objects, some parallel connections
Second Grounding Grids is all connected on the second horizontal grounding objects.
As optimization, the resistance of described grounding device is less than 4 ohm.Otherwise, as shown in dotted line in figure, set up one group of grounding device, as
The multiple grounding of power supply PE line in effusion meter instrument box, it is desirable to actual measurement earth resistance is less than or equal to 4 ohm.
As optimization, described metal tube is the zinc-plated cable protection pipe of SC40, and described metal tube two ends tube wall is welded with screw, by gold
The screw belonging to pipe two ends connects wire, is connected with described flowmeter sensor and effusion meter instrument box respectively.The zinc-plated cable of described SC40 is protected
Between pillar by the way of sleeve pipe welds, answering two mouth of pipe alignments, be connected firmly during connection, good seal, the short sleeve length of socket is not
Should be less than 2.2 times of cable tube external diameter, it is ensured that its total length is intact electric path.
As optimization, described flowmeter sensor is arranged in effusion meter well, aboveground manhole and the well lid of being provided with of described effusion meter, described flow
The pipe flange of flowmeter sensor is provided with drilling and tapping, is connected with ground connection mounting line between pipe flange.
As optimization, described first horizontal grounding objects, the second horizontal grounding objects, the first Grounding Grids, the second Grounding Grids are hot dip
Zinc round steel, the degree of depth of described first Grounding Grids and the second Grounding Grids is more than 1m.As flow meter signal ground connection, it is usually relatively
The moist local length of embedment copper rod more than 1m, and with total cross section more than 4mm2The earth terminal that strand copper wire is earth lead and sensor
It is connected.
As optimization, described first Grounding Grids, the second Grounding Grids are galvanizing angle steel, described first horizontal grounding objects, second
Horizontal grounding objects is galvanizing band iron steel.1.5-2.5 times of described galvanizing band iron steel overlap welding a length of galvanizing band iron steel width, preferably
It is 2 times, and the welding of at least three seamed edge, described galvanizing round steel is taken 5.5-6.5 times that weld length is galvanizing round steel diameter, is preferably
6 times.Grounding material all uses galvanizing unit steel, if desired, then Grounding Grids can replace with L50*5 galvanizing angle steel, level connects
Terrain can substitute with 40*4 Hot-dip zinc-coated flat steel sheet.
As optimization, connected by overlap welding between described first horizontal grounding objects and the first Grounding Grids, described second horizontal grounding objects
Connected by overlap welding with the second Grounding Grids.Scribbling preservative in the outer 100mm of joint welding lapping defect, galvanizing steel welding position all should be
Preservative treatment is done in the outer 100mm of welding trace.
Beneficial effect: inventive flow meter instrument power ground connection is provided separately with signal ground, sets one group of ground connection near flowmeter sensor
Device, sensor should have good independent grounding line, it is ensured that effusion meter instrument precision is high, is susceptible to the interference of extraneous parasitic electromotive force.
Ring network can form multiple guiding point over the ground, in engineering reality, be usually when foundation construction with special-purpose metal part by the foundation pile in house or
The basis of other pattern couples together, and Guan Bi advantageously forms parallel circuit.Multiple spot guides to underground, and the evacuation scope of steering current is the most to the greatest extent
May be big, the time that electric current passes through shortens the most relatively, preferably house is implemented protection.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram.
Detailed description of the invention
It is clearly understood to make present disclosure be easier to, below according to specific embodiment and combine accompanying drawing, the present invention is made into one
Step detailed description.
As shown in drawings, a kind of effusion meter ring ground, including effusion meter instrument box 1, flow transducer 2, flowmeter sensor 2
Near set one group of grounding device, as flow meter signal ground connection, it is desirable to actual measurement earth resistance less than or equal to 10 ohm, effusion meter instrument box 1
It is connected by 10mm plastics copper core with earth bus in building 3;Or below outdoor ground, set up one group connect as shown in drawings
Ground system, as the multiple grounding of power supply PE row, it is desirable to actual measurement earth resistance is less than 4 ohm, and earthed system includes the first horizontal grounding objects
4, the second Grounding Grids 8 that the second horizontal grounding objects 5, metal tube 6, two are in parallel the first Grounding Grids 7, three is in parallel;Two
First Grounding Grids 7 of individual parallel connection is all connected on the first horizontal grounding objects 4, the first horizontal grounding objects 4 even flowmeter sensor 2 and gold
Belong to pipe 6, metal tube 6 even effusion meter instrument box 1, effusion meter instrument box 1 even earth bus 3, earth bus 3 even the second horizontal grounding objects
5, three the second Grounding Grids 8 in parallel are all connected on the second horizontal grounding objects 5.
Metal tube 6 is the zinc-plated cable protection pipe of SC40, is welded by sleeve pipe between zinc-plated cable protection pipe, and the short sleeve length of socket is not
Less than 2.2 times of zinc-plated cable protection pipe external diameter, metal tube 6 two ends tube wall is welded with M8 galvanized screw 9, by metal tube 6 two ends
Screw 9 connect 2.5mm plastics copper conductor, be connected with described flowmeter sensor 2 and effusion meter instrument box 1 respectively.
Flowmeter sensor 2 is arranged in effusion meter well 10, and described effusion meter well 10 is provided with manhole and well lid, flowmeter sensor 2
Pipe flange be provided with drilling and tapping 11, be connected with between pipe flange ground connection mounting line 12,2.5mm is full of by flow transducer 2 and moulds
Material copper core.
First horizontal grounding objects the 4, second horizontal grounding objects 5 is the galvanizing round steel of diameter 10mm, and the first Grounding Grids 7, second hangs down
Directly terrain 8 is the galvanizing round steel of diameter 18mm, and the degree of depth of described first Grounding Grids 7 and the second Grounding Grids 8 is about
3.1m;First Grounding Grids the 7, second Grounding Grids 8 is galvanizing angle steel, first horizontal grounding objects the 4, second horizontal grounding objects 5
For 40*4 galvanizing band iron steel;Connected by overlap welding between first horizontal grounding objects 4 and the first Grounding Grids 7, the second horizontal grounding
Body 5 and the second Grounding Grids 8 are connected by overlap welding, scribble preservative in the outer 100mm of joint welding lapping defect.
1.5-2.5 times of galvanizing band iron steel overlap welding a length of galvanizing band iron steel width, at least three seamed edge welds, and galvanizing round steel is taken
Weld length is 5.5-6.5 times of galvanizing round steel diameter.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the present invention patent and modification, all should belong to
The covering scope of the present invention.
Claims (12)
1. an effusion meter ring ground, it is characterized in that: include effusion meter instrument box (1), flow transducer (2), one group of grounding device it is provided with near described flow transducer, the actual measurement earth resistance of described grounding device is less than or equal to 10 ohm, and described effusion meter instrument box (1) is connected with earth bus in building (3).
2. or set up one group of earthed system below outdoor ground, as the multiple grounding of power supply PE row, described earthed system includes second Grounding Grids (8) of the first horizontal grounding objects (4), the second horizontal grounding objects (5), metal tube (6), first Grounding Grids (7) of some parallel connections, some parallel connections.
3. first Grounding Grids (7) of some parallel connections described in is all connected on the first horizontal grounding objects (4), first horizontal grounding objects (4) even flowmeter sensor (2) and metal tube (6), metal tube (6) even effusion meter instrument box (1), effusion meter instrument box (1) even earth bus (3), earth bus (3) even the second horizontal grounding objects (5), second Grounding Grids (8) of some parallel connections is all connected on the second horizontal grounding objects (5).
Effusion meter ring ground the most according to claim 1, it is characterised in that: the resistance of described earthed system is less than 4 ohm.
Effusion meter ring ground the most according to claim 1; it is characterized in that: described metal tube (6) is zinc-plated cable protection pipe; it is welded with screw (9) on the tube wall of described metal tube (6) two ends; connect wire by the screw (9) at metal tube (6) two ends, be connected with described flowmeter sensor (2) and effusion meter instrument box (1) respectively.
Effusion meter ring ground the most according to claim 3, it is characterised in that: being welded by sleeve pipe between described zinc-plated cable protection pipe, the short sleeve length of socket is not less than 2.2 times of described zinc-plated cable protection pipe external diameter.
Effusion meter ring ground the most according to claim 1, it is characterized in that: described flowmeter sensor (2) is arranged in effusion meter well (10), described effusion meter well (10) is provided with manhole and well lid, the pipe flange of described flowmeter sensor (2) is provided with drilling and tapping (11), is connected with ground connection mounting line (12) between pipe flange.
Effusion meter ring ground the most according to claim 1, it is characterized in that: described first horizontal grounding objects (4), the second horizontal grounding objects (5), the first Grounding Grids (7), the second Grounding Grids (8) are galvanizing round steel, the degree of depth of described first Grounding Grids (7) and the second Grounding Grids (8) is more than 1m.
Effusion meter ring ground the most according to claim 1, it is characterized in that: described first Grounding Grids (7), the second Grounding Grids (8) are galvanizing angle steel, described first horizontal grounding objects (4), the second horizontal grounding objects (5) are galvanizing band iron steel.
Effusion meter ring ground the most according to claim 7, it is characterized in that: 1.5-2.5 times of described galvanizing band iron steel overlap welding a length of galvanizing band iron steel width, at least three seamed edge welds, and 5.5-6.5 times that weld length is galvanizing round steel diameter taken by described galvanizing round steel.
11. according to effusion meter ring ground described in any one in claim 1 to 8, it is characterized in that: connected by overlap welding between described first horizontal grounding objects (4) and the first Grounding Grids (7), described second horizontal grounding objects (5) and the second Grounding Grids (8) are connected by overlap welding.
12. effusion meter ring grounds according to claim 9, it is characterised in that: scribble preservative in the outer 100mm of described joint welding lapping defect.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201410758418.9A CN105890707A (en) | 2014-12-09 | 2014-12-09 | Annular grounding device of flowmeter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201410758418.9A CN105890707A (en) | 2014-12-09 | 2014-12-09 | Annular grounding device of flowmeter |
Publications (1)
Publication Number | Publication Date |
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CN105890707A true CN105890707A (en) | 2016-08-24 |
Family
ID=56700835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN201410758418.9A Pending CN105890707A (en) | 2014-12-09 | 2014-12-09 | Annular grounding device of flowmeter |
Country Status (1)
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CN (1) | CN105890707A (en) |
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2014
- 2014-12-09 CN CN201410758418.9A patent/CN105890707A/en active Pending
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Application publication date: 20160824 |