CN203132628U - Annular grounding device for flow meter - Google Patents
Annular grounding device for flow meter Download PDFInfo
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- CN203132628U CN203132628U CN 201220694035 CN201220694035U CN203132628U CN 203132628 U CN203132628 U CN 203132628U CN 201220694035 CN201220694035 CN 201220694035 CN 201220694035 U CN201220694035 U CN 201220694035U CN 203132628 U CN203132628 U CN 203132628U
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- flowmeter
- ground
- grounding
- grounding body
- vertical junction
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Abstract
The utility model discloses an annular grounding device for a flow meter. The annular grounding device comprises a flow meter instrument box and a flow sensor, wherein a group of grounding device bodies is arranged near the flow sensor, measured grounding resistance of each grounding device body is less than or equal to 10 ohms, and the flow meter instrument box is connected with a grounding bus in a building; or a group of grounding systems is additionally arranged under the ground outdoors to serve as iterative earth of a power supply PE row. Each grounding system comprises a first horizontal grounding body, a second horizontal grounding body, a metal pipe, a plurality of first vertical grounding bodies which are in parallel connection, and a plurality of second vertical grounding bodies which are in parallel connection. Flow meter instrument power supply grounding and signal grounding are separately arranged, one group of the grounding device bodies is arranged near the flow sensor, and the sensor is provided with a good individual grounding line. Therefore high precision of a flow meter instrument is guaranteed, and the grounding device is not prone to being interfered by outside parasitic potential.
Description
Technical field
The utility model relates to earthing device, be specifically related to a kind of for flow sensor with have the flowmeter ring ground that the mounting flange metal tube is connected.
Background technology
Electromagnetic flowmeter wants operate as normal to want ground connection certainly, but when metallic conduit is installed, because metallic conduit all has enough contacting with the earth, thus the way of ground connection can be saved, if when plastic conduit and liner pipe installation, just ground connection must be arranged.
Electromagnetic flowmeter ground connection must be satisfied 2 requirements simultaneously:
(1) from principle of work and signal circuit analysis, the earth terminal of flowmeter must be idiostatic with measured medium.
(2) reliable ground is zero-bit with the earth, reduces external interference.
For making the instrument reliably working, improve measuring accuracy, be not subjected to the interference of extraneous parasitic electromotive force, sensor should have good independent grounding line, ground wire is not connected on the common ground of motor or miscellaneous equipment.Stake resistance＜10 Ω.
Process pipe is metallic conduit generally speaking, and itself is with regard to ground connection, and when scribbling insulation course or nonmetal pipeline as if the process pipe inwall, ground loop also should be equipped with in the sensor both sides.But big in the extraneous interference of electromagnetic field, when especially stray current such as power frequency is big on the pipeline, earthing device should be set separately.
The utility model content
The utility model purpose: the utility model provides a kind of flowmeter ring ground in order to solve the deficiencies in the prior art.
Technical scheme: a kind of flowmeter ring ground, comprise flowmeter instrument box, flow sensor, be provided with winding ground device near the described flow sensor, the actual measurement stake resistance of described earthing device is smaller or equal to 10 ohm, and described flowmeter instrument box is connected with ground strap in the buildings; PE row requires reliably to be connected with the interior ground strap of 10mm copper core plastic cord and instrument box place buildings in the flowmeter instrument box.
Perhaps below outdoor ground, set up winding ground system, as power supply PE row's multiple grounding, described earthed system comprises the second vertical junction terrain of the first horizontal grounding body, the second horizontal grounding body, metal tube, the first vertical junction terrain of some parallel connections, some parallel connections; The first vertical junction terrain of described some parallel connections all is connected on the first horizontal grounding body, the first horizontal grounding body connects flowmeter sensor and metal tube, metal tube connects the flowmeter instrument box, the flowmeter instrument box connects the ground bus, ground strap connects the second horizontal grounding body, and the second vertical junction terrain of some parallel connections all is connected on the second horizontal grounding body.
As optimization, the resistance of described earthing device is less than 4 ohm.Otherwise, by setting up winding ground device among the figure shown in the dotted line, as the multiple grounding of power supply PE line in the flowmeter instrument box, require the actual measurement stake resistance smaller or equal to 4 ohm.
As optimization, described metal tube is the zinc-plated cable protection pipe of SC40, is welded with screw on the tube wall of described metal tube two ends, and the screw connection lead by the metal tube two ends links to each other with the flowmeter instrument box with described flowmeter sensor respectively.By the mode of sleeve pipe welding, answer two mouths of pipe to aim at, be connected firmly during connection between the zinc-plated cable protection pipe of described SC40, good seal, the short sleeve length of socket should not guarantee that its total length is intact electric path less than 2.2 times of cable tube external diameter.
As optimization, described flowmeter sensor is installed in the flowmeter well, aboveground manhole and the well lid of being provided with of described flowmeter, and the pipe flange of described flowmeter sensor is provided with drilling and tapping, is connected with ground connection between the pipe flange and articulates line.
As optimization, the described first horizontal grounding body, the second horizontal grounding body, the first vertical junction terrain, the second vertical junction terrain are the galvanizing round steel, and the degree of depth of the described first vertical junction terrain and the second vertical junction terrain is greater than 1m.As flow meter signal ground connection, generally be at the copper rod of moist local length of embedment greater than 1m, and with gross section greater than 4mm
2The multiply copper cash be that ground wire links to each other with the earth terminal of sensor.
As optimization, the described first vertical junction terrain, the second vertical junction terrain are the galvanizing angle steel, and the described first horizontal grounding body, the second horizontal grounding body are galvanizing band iron steel.The 1.5-2.5 that described galvanizing band iron steel end lap weld length is galvanizing band iron steel width doubly is preferably 2 times, and at least three seamed edge welding, and the 5.5-6.5 that described galvanizing round steel joint welding spreading degree is galvanizing round steel diameter doubly is preferably 6 times.Grounding material all adopts galvanizing unit steel, and as needs, then the vertical junction terrain can replace with L50*5 galvanizing angle steel, and the horizontal grounding body can substitute with the 40*4 Hot-dip zinc-coated flat steel sheet.
As optimization, connect by end lap weld between the described first horizontal grounding body and the first vertical junction terrain, the described second horizontal grounding body is connected by end lap weld with the second vertical junction terrain.Scribble antiseptic in the outer 100mm of joint welding lapping defect, preservative treatment all should be done in the 100mm in galvanizing steel welding position outside the weldering trace.
Beneficial effect: the utility model flowmeter instrument power ground connection and signal ground branch are arranged, near flowmeter sensor, establish winding ground device, sensor should have good independent grounding line, has guaranteed flowmeter instrument precision height, is not subject to the interference of extraneous parasitic electromotive force.Ring network can form a plurality of guiding point over the ground, in the engineering reality, generally is with special-purpose metal spare the foundation pile in house or the basis of other pattern to be coupled together when foundation construction, and closure is conducive to form parallel circuit.Multiple spot is to underground guiding, and the evacuation scope of guiding electric current is just big as far as possible, and the time that electric current passes through just shortens relatively, better protection is implemented in the house.
Description of drawings
Accompanying drawing is the utility model structural representation.
Embodiment
As shown in drawings, a kind of flowmeter ring ground, comprise flowmeter instrument box 1, flow sensor 2, establish winding ground device near the flowmeter sensor 2, as flow meter signal ground connection, require the actual measurement stake resistance smaller or equal to 10 ohm, flowmeter instrument box 1 is connected by 10mm plastics copper core with the interior ground strap 3 of buildings; Perhaps below outdoor ground, set up one group of earthed system as shown in drawings, multiple grounding as power supply PE row, require the actual measurement stake resistance less than 4 ohm, earthed system comprises the second vertical junction terrain 8 of the first horizontal grounding body 4, the second horizontal grounding body 5, metal tube 6, the first vertical junction terrain 7 of two parallel connections, three parallel connections; The first vertical junction terrain 7 of two parallel connections all is connected on the first horizontal grounding body 4, the first horizontal grounding body 4 connects flowmeter sensor 2 and metal tube 6, metal tube 6 connects flowmeter instrument box 1, flowmeter instrument box 1 connects ground bus 3, the second vertical junction terrain 8 that ground strap 3 connects 5, three parallel connections of the second horizontal grounding body all is connected on the second horizontal grounding body 5.
Metal tube 6 is the zinc-plated cable protection pipe of SC40; weld by sleeve pipe between the zinc-plated cable protection pipe; the short sleeve length of socket is not less than 2.2 times of zinc-plated cable protection external diameter of pipe; be welded with M8 galvanized screw 9 on the metal tube 6 two ends tube walls; screw 9 by metal tube 6 two ends connects 2.5mm plastics copper conductor, links to each other with flowmeter instrument box 1 with described flowmeter sensor 2 respectively.
The first horizontal grounding body 4, the second horizontal grounding body 5 are the galvanizing round steel of diameter 10mm, the first vertical junction terrain 7, the second vertical junction terrain 8 are the galvanizing round steel of diameter 18mm, and the degree of depth of the described first vertical junction terrain 7 and the second vertical junction terrain 8 is about 3.1m; The first vertical junction terrain 7, the second vertical junction terrain 8 are the galvanizing angle steel, and the first horizontal grounding body 4, the second horizontal grounding body 5 are 40*4 galvanizing band iron steel; Connect by end lap weld between the first horizontal grounding body 4 and the first vertical junction terrain 7, the second horizontal grounding body 5 is connected by end lap weld with the second vertical junction terrain 8, and the joint welding lapping defect scribbles antiseptic in the 100mm outward.
Galvanizing band iron steel end lap weld length is 1.5-2.5 times of galvanizing band iron steel width, at least three seamed edges welding, and galvanizing round steel joint welding spreading degree is 5.5-6.5 times of galvanizing round steel diameter.
Claims (10)
1. flowmeter ring ground, it is characterized in that: comprise flowmeter instrument box (1), flow sensor (2), be provided with winding ground device near the described flow sensor, the actual measurement stake resistance of described earthing device is smaller or equal to 10 ohm, and described flowmeter instrument box (1) is connected with ground strap (3) in the buildings;
Perhaps below outdoor ground, set up winding ground system, as power supply PE row's multiple grounding, described earthed system comprises the second vertical junction terrain (8) of the first horizontal grounding body (4), the second horizontal grounding body (5), metal tube (6), the first vertical junction terrain (7) of some parallel connections, some parallel connections;
The first vertical junction terrain (7) of described some parallel connections all is connected on the first horizontal grounding body (4), the first horizontal grounding body (4) connects flowmeter sensor (2) and metal tube (6), metal tube (6) connects flowmeter instrument box (1), flowmeter instrument box (1) connects ground bus (3), ground strap (3) connects the second horizontal grounding body (5), and the second vertical junction terrain (8) of some parallel connections all is connected on the second horizontal grounding body (5).
2. according to the described flowmeter ring ground of claim 1, it is characterized in that: the resistance of described earthed system is less than 4 ohm.
3. according to the described flowmeter ring ground of claim 1; it is characterized in that: described metal tube (6) is zinc-plated cable protection pipe; be welded with screw (9) on the tube wall of described metal tube (6) two ends; screw (9) by metal tube (6) two ends connects lead, links to each other with flowmeter instrument box (1) with described flowmeter sensor (2) respectively.
4. according to the described flowmeter ring ground of claim 3, it is characterized in that: by the sleeve pipe welding, the short sleeve length of socket is not less than 2.2 times of described zinc-plated cable protection external diameter of pipe between the described zinc-plated cable protection pipe.
5. according to the described flowmeter ring ground of claim 1, it is characterized in that: described flowmeter sensor (2) is installed in the flowmeter well (10), described flowmeter 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 between the pipe flange and articulates line (12).
6. according to the described flowmeter ring ground of claim 1, it is characterized in that: the described first horizontal grounding body (4), the second horizontal grounding body (5), the first vertical junction terrain (7), the second vertical junction terrain (8) are the galvanizing round steel, and the degree of depth of the described first vertical junction terrain (7) and the second vertical junction terrain (8) is greater than 1m.
7. according to the described flowmeter ring ground of claim 1, it is characterized in that: the described first vertical junction terrain (7), the second vertical junction terrain (8) are the galvanizing angle steel, and the described first horizontal grounding body (4), the second horizontal grounding body (5) are galvanizing band iron steel.
8. according to the described flowmeter ring ground of claim 7, it is characterized in that: the 1.5-2.5 that described galvanizing band iron steel end lap weld length is galvanizing band iron steel width doubly, at least three seamed edge welding, the 5.5-6.5 that described galvanizing round steel joint welding spreading degree is galvanizing round steel diameter doubly.
9. according to any described flowmeter ring ground in the claim 1 to 8, it is characterized in that: connect by end lap weld between the described first horizontal grounding body (4) and the first vertical junction terrain (7), the described second horizontal grounding body (5) is connected by end lap weld with the second vertical junction terrain (8).
10. according to the described flowmeter ring ground of claim 9, it is characterized in that: scribble antiseptic in the outer 100mm of described joint welding lapping defect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220694035 CN203132628U (en) | 2012-12-11 | 2012-12-11 | Annular grounding device for flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220694035 CN203132628U (en) | 2012-12-11 | 2012-12-11 | Annular grounding device for flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203132628U true CN203132628U (en) | 2013-08-14 |
Family
ID=48940600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220694035 Expired - Fee Related CN203132628U (en) | 2012-12-11 | 2012-12-11 | Annular grounding device for flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203132628U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048118A (en) * | 2015-05-25 | 2015-11-11 | 平顶山电子衡器制造有限公司 | Grounding device for stabilizing electronic weighing instrument |
| CN106384896A (en) * | 2016-11-15 | 2017-02-08 | 高环 | Grounding device for electric instrument |
-
2012
- 2012-12-11 CN CN 201220694035 patent/CN203132628U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048118A (en) * | 2015-05-25 | 2015-11-11 | 平顶山电子衡器制造有限公司 | Grounding device for stabilizing electronic weighing instrument |
| CN106384896A (en) * | 2016-11-15 | 2017-02-08 | 高环 | Grounding device for electric instrument |
| CN106384896B (en) * | 2016-11-15 | 2018-11-30 | 石家庄安邦世通自动化设备有限公司 | A kind of electric meter earthing or grounding means |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130814 Termination date: 20151211 |
|
| EXPY | Termination of patent right or utility model |