CN207030441U - A kind of pneumatic ash conveying plant of thermal power plant's Level control - Google Patents
A kind of pneumatic ash conveying plant of thermal power plant's Level control Download PDFInfo
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- CN207030441U CN207030441U CN201720745932.8U CN201720745932U CN207030441U CN 207030441 U CN207030441 U CN 207030441U CN 201720745932 U CN201720745932 U CN 201720745932U CN 207030441 U CN207030441 U CN 207030441U
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Abstract
It the utility model is related to a kind of pneumatic ash conveying plant of thermal power plant's Level control, belong to energy saving for power plants technical field, ultrasonic material level detection unit or radar level gauge are installed in electric precipitation ash bucket, and material position alarm signal is set according to the ash quantity of depositing in ash bucket, the dust carried in flue gas is ionized absorption on positive plate when passing through electric precipitation electric field, anode rapping taps positive plate, ash on positive plate is fallen in ash bucket, ash bucket internal memory ash quantity is measured by ash bucket charge level indicator, when the high I values alarm of ash bucket material position, defeated grey unit starts defeated ash where the ash bucket, after high I values alarm signal disappears, defeated ash terminates.The utility model can deposit how much carry out Pneumatic ash conveyings of ash quantity according to ash bucket, prevent the defeated grey situation of pneumatic ash transmitting system blank pipe, reduce waste and the loading working time of defeated grey air compressor machine of compressed air, effectively reduce defeated grey power consumption.
Description
Technical field
Energy saving for power plants technical field is the utility model is related to, more particularly to a kind of pneumatic transporting of thermal power plant's Level control
Apparatus for ash.
Background technology
Lower heat value and ash of the design rating of thermal power plant's pneumatic ash transmitting system generally according to design coal under peak load
Divide and calculate total defeated ash quantity, and 150% or so allowance can be left, when ash-transmission system is run, each defeated grey unit corresponds to a defeated ash
Pipeline, a plurality of ash conveying pipe interlocked by pipeline, continuous defeated grey mode is run one by one in turn, even in operating mode at full capacity, because
It is less than design flow for ash quantity, pipeline no-load running can be caused, causes the waste of compressed air and defeated grey air compressor machine power consumption；When multiple
When ash bucket high charge level occurs simultaneously, defeated ash handing system carries out defeated ash automatically into latching mode, can cause ash pipeline again
Road blocks, ash-transmission system paralysis.When carrying out defeated grey by the way of Level control, the feelings of ash conveying pipe blank pipe operation can be prevented
Condition, when multiple ash bucket high charge levels are alarmed, according to the priority of alarm defeated ash, or controlled defeated ash manually one by one, both may be used
To reduce defeated grey air compressor machine power consumption, can effectively solve the problems, such as ash conveying pipe blocking again.
Utility model content
The purpose of this utility model is to overcome above shortcomings in the prior art, and provides a kind of structure design and close
The pneumatic ash conveying plant of thermal power plant's Level control of reason, to solve the problems, such as that defeated grey unit blank pipe is defeated grey, reduce the defeated ash of thermal power plant
Power consumption, improve unit economy.
The technical scheme in the invention for solving the above technical problem is：The Pneumatic ash conveying dress of thermal power plant's Level control
Put, its design feature is：Including No.1 ash bucket, No. two ash buckets, No. three ash buckets, No. four ash buckets, No.1 level-sensing device, No. two material positions
Meter, No. three level-sensing devices, No. four level-sensing devices, No.1 discharge valve, No. two discharge valves, No. three discharge valves, No. four discharge valves, No.1 storehouse
Pump, No. two storehouse pumps, No. three storehouse pumps, No. four storehouse pumps, ash conveying pipe, intake valves；The No.1 level-sensing device is arranged in No.1 ash bucket,
The No.1 discharge valve be arranged on No.1 ash bucket bottom, No.1 storehouse pump be arranged on No.1 discharge valve bottom, described two
Number level-sensing device is arranged in No. two ash buckets, and No. two discharge valves are arranged on the bottom of No. two ash buckets, the installation of No. two storehouses pump
In the bottom of No. three discharge valves, No. three level-sensing devices are arranged in No. three ash buckets, and No. three discharge valves are arranged on No. three ashes
The bottom of bucket, No. three storehouse pumps are arranged on the bottom of No. three discharge valves, and No. four level-sensing devices are arranged in No. four ash buckets, institute
State No. four discharge valves and be arranged on the bottom of No. four discharge valves, the No.1 installed in the bottom of No. four ash buckets, No. four storehouse pumps
The bottom of storehouse pump is connected by ash conveying pipe with the bottom of No. two storehouse pumps, and the bottom of No. two storehouse pumps passes through ash conveying pipe and three
The bottom connection of number storehouse pump, the bottom of No. three storehouse pumps are connected by ash conveying pipe with the bottom of No. four storehouse pumps, the air inlet
Valve is arranged on ash conveying pipe；
When the No.1 discharge valve is opened, the ash in the No.1 ash bucket is fallen into the pump of No.1 storehouse, and compressed air is by one
Ash in number storehouse pump is delivered to grey storehouse by ash conveying pipe；When No. two discharge valves are opened, the ash in No. two ash buckets
Fall into No. two storehouse pumps, the ash in No. two storehouse pumps is delivered to grey storehouse by compressed air by ash conveying pipe；When No. three blankings
When valve is opened, the ash in No. three ash buckets is fallen into No. three storehouse pumps, and the ash in No. three storehouse pumps is passed through ash pipeline by compressed air
Road is delivered to grey storehouse；When No. four discharge valves are opened, the ash in No. four ash buckets is fallen into No. four storehouse pumps, compressed air
Ash in No. four storehouse pumps is delivered to grey storehouse by ash conveying pipe.
Further, the No.1 material position is calculated as ultrasonic material level detection unit or radar level gauge, and No. two material positions are calculated as surpassing
Sound wave level-sensing device or radar level gauge, No. three material positions are calculated as ultrasonic material level detection unit or radar level gauge, No. four material positions
It is calculated as ultrasonic material level detection unit or radar level gauge；When two points depositing ash quantity and highly reaching No.1 bin length of the No.1 ash bucket
One of, and the half deposited ash quantity and highly reach No. two bin lengths of No. two ash buckets, and No. three ash buckets deposit ash quantity height
Reach the half of No. three bin lengths, and the half deposited ash quantity and highly reach No. four bin lengths of No. four ash buckets
When, high I values alarm is sent, and the defeated grey unit starts defeated ash.
Further, grey storehouse is connected with the ash conveying pipe；When the No.1 discharge valve, No. two discharge valves, No. three fall
When material valve and No. four discharge valves are opened, No.1 storehouse pump, No. two storehouse pumps, No. three storehouse pumps and No. four storehouse pumps start dress ash；3s-
No.1 discharge valve, No. two discharge valves, No. three discharge valves and No. four discharge valves are turned off after 5s, No.1 storehouse pump, No. two storehouse pumps,
No. three storehouse pumps and No. four storehouse pumps dress ashes terminate, the inlet open, the ash in the pump of the No.1 storehouse, the ash in No. two storehouse pumps,
The ash in ash and No. four storehouse pumps in No. three storehouse pumps is delivered to grey storehouse under the carrying of compressed air；According in the ash conveying pipe
The pressure of compressed air judges No.1 storehouse pump, No. two storehouse pumps, No. three storehouse pumps and No. four storehouse pump internal memory ash delivery situations；The air inlet
Valve is closed, and the No.1 discharge valve of the defeated grey unit, No. two discharge valves, No. three discharge valves and No. four discharge valves continue on, 3s-5s
No.1 discharge valve, No. two discharge valves, No. three discharge valves and No. four discharge valves are turned off afterwards, and electric precipitation continues defeated grey program；
When deposit ash quantity and highly drop to No.1 bin length less than 1/3rd of the No.1 ash bucket, and No. two ash buckets deposit ash quantity
Less than/3rd of No. two bin lengths are highly dropped to, and the ash quantity of depositing of No. three ash buckets highly drops to No. three bin lengths
Less than 1/3rd, and when depositing ash quantity and highly dropping to less than 1/3rd of No. four bin lengths of No. four ash buckets, high I values
Blackout, the defeated grey unit terminate defeated ash；When multiple defeated grey unit alarms, carried out one by one according to the priority of alarm defeated
Ash, multiple defeated grey units defeated ash simultaneously is avoided, causes ash conveying pipe to block.
Compared with prior art, the utility model has advantages below：
1st, effectively prevent the situation of ash conveying pipe blank pipe operation, reduce defeated grey air compressor machine Load and execution time and pneumatics
The number of units of machine operation, reduces the defeated grey power consumption of defeated grey air compressor machine, saves resource.
2nd, can effectively solve the problems, such as ash conveying pipe blocking.
Brief description of the drawings
Fig. 1 is the connection relationship diagram of the pneumatic ash conveying plant of thermal power plant's Level control of the utility model embodiment.
Fig. 2 is the flow chart of the Pneumatic ash conveying method of thermal power plant's Level control of the embodiment of the present invention.
Label declaration：11- No.1s ash bucket, No. bis- ash buckets of 21-, No. tri- ash buckets of 31-, No. tetra- ash buckets of 41-, 12- No.1 material positions
Meter, No. bis- level-sensing devices of 22-, No. tri- level-sensing devices of 32-, No. tetra- level-sensing devices of 42-, 13- No.1s discharge valve, 23- No. bis- discharge valves, 33-
No. tetra- No. three discharge valves, No. tetra- discharge valves of 43-, 14- No.1s storehouse pump, No. bis- storehouse pumps of 24-, No. tri- storehouse pumps of 34-, 44- storehouse pumps, 5- are defeated
Grey pipeline, 6- intake valves.
Embodiment
Below in conjunction with the accompanying drawings and the utility model is described in further detail by embodiment, and following examples are pair
It is of the present utility model explanation and the utility model is not limited to following examples.
Embodiment.
Referring to shown in Fig. 1 to Fig. 2, it should however be clear that structure, ratio, size depicted in this specification institute accompanying drawings etc., only use
To coordinate the content disclosed in specification, so that those skilled in the art understands and reads, it is new to be not limited to this practicality
The enforceable qualifications of type, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or size
Adjustment, in the case where not influenceing the effect of the utility model can be generated and the purpose that can reach, all should still fall new in this practicality
In the range of technology contents disclosed in type can be covered.Meanwhile if in this specification with quote as " on ", " under ", " left side ",
The term on " right side ", " centre " and " one " etc., understanding for narration is merely convenient to, and it is enforceable to be not used to restriction the utility model
Scope, its relativeness are altered or modified, enforceable when being also considered as the utility model in the case where changing technology contents without essence
Category.
In the present embodiment, the pneumatic ash conveying plant of thermal power plant's Level control：
The device includes 31, No. four ash buckets 41 of the ash bucket of ash bucket 21, three of No.1 ash bucket 11, two, No.1 level-sensing device 12, two
Number level-sensing device 32, four of level-sensing device 22, three level-sensing device 42, the discharge valve 23, three of No.1 discharge valve 13, two discharge valve 33,
No. four discharge valves 43, No.1 storehouse pump 14, two storehouse pump 24, three storehouse pump 34, No. four storehouse pumps 44, ash conveying pipe 5, intake valves 6；One
Number level-sensing device 12 is arranged in No.1 ash bucket 11, and No.1 discharge valve 13 is arranged on the bottom of No.1 ash bucket 11, and No.1 storehouse pump 14 is pacified
Mounted in the bottom of No.1 discharge valve 13, No. two level-sensing devices 22 are arranged in No. two ash buckets 21, and No. two discharge valves 23 are arranged on No. two
The bottom of ash bucket 21, No. two storehouse pumps 24 are arranged on the bottom of No. three discharge valves 33, and No. three level-sensing devices 32 are arranged on No. three ash buckets 31
Interior, No. three discharge valves 33 are arranged on the bottom of No. three ash buckets 31, and No. three storehouse pumps 34 are arranged on the bottom of No. three discharge valves 33, No. four
Level-sensing device 42 is arranged in No. four ash buckets 41, and No. four discharge valves 43 are arranged on the bottom of No. four ash buckets 41, and No. four storehouse pumps 44 are installed
In the bottom of No. four discharge valves 43, the bottom of No.1 storehouse pump 14 is connected by ash conveying pipe 5 with the bottom of No. two storehouse pumps 24, No. two
The bottom of storehouse pump 24 is connected by ash conveying pipe 5 with the bottom of No. three storehouse pumps 34, and the bottom of No. three storehouse pumps 34 passes through ash conveying pipe 5
It is connected with the bottom of No. four storehouse pumps 44, intake valve 6 is arranged on ash conveying pipe 5.
In the present embodiment, No.1 level-sensing device 12 is ultrasonic material level detection unit or radar level gauge, and No. two level-sensing devices 22 are ultrasound
Ripple level-sensing device or radar level gauge, No. three level-sensing devices 32 are ultrasonic material level detection unit or radar level gauge, and No. four level-sensing devices 42 are super
Sound wave level-sensing device or radar level gauge.
In the present embodiment, grey storehouse is connected with ash conveying pipe 5.
In the present embodiment, the Pneumatic ash conveying method of thermal power plant's Level control, step is as follows：
The defeated grey unit of electric precipitation has the ash bucket 31 of ash bucket 21, three of No.1 ash bucket 11, two and No. four ash buckets 41, by No.1
Storehouse pump 14 is arranged on the bottom of No.1 ash bucket 11, No. two storehouse pumps 24 is arranged on to the bottom of No. two ash buckets 21, by No. three storehouse pumps 34
Installed in the bottom of No. three ash buckets 31, by No. four storehouse pumps 44 installed in the bottom of No. four ash buckets 41, the bottom of No.1 storehouse pump 14
Portion is connected with the bottom of No. two storehouse pumps 24 by ash conveying pipe 5, and the bottom of No. two storehouse pumps 24 and the bottom of No. three storehouse pumps 34 pass through
Ash conveying pipe 5 is connected, and the bottom of No. three storehouse pumps 34 is connected with the bottom of No. four storehouse pumps 44 by ash conveying pipe 5, No.1 ash bucket 11
No.1 discharge valve 13 is installed between No.1 storehouse pump 14, No. two discharge valves are installed between No. two ash buckets 21 and No. two storehouse pumps 24
23, No. three discharge valves 33 are installed between No. three ash buckets 31 and No. three storehouse pumps 34, pacified between No. four ash buckets 41 and No. four storehouse pumps 44
Equipped with No. four discharge valves 43；
When No.1 discharge valve 13 is opened, the ash in No.1 ash bucket 11 is fallen into No.1 storehouse pump 14, and compressed air is by No.1
Ash in storehouse pump 14 is delivered to grey storehouse by ash conveying pipe 5；When No. two discharge valves 23 are opened, the ash in No. two ash buckets 21 is fallen into
In No. two storehouse pumps 24, the ash in No. two storehouse pumps 24 is delivered to grey storehouse by compressed air by ash conveying pipe 5；When No. three discharge valves 33
During unlatching, the ash in No. three ash buckets 31 is fallen into No. three storehouse pumps 34, and the ash in No. three storehouse pumps 34 is passed through ash pipeline by compressed air
Road 5 is delivered to grey storehouse；When No. four discharge valves 43 are opened, the ash in No. four ash buckets 41 is fallen into No. four storehouse pumps 44, compressed air
Ash in No. four storehouse pumps 44 is delivered to grey storehouse by ash conveying pipe 5.
In the present embodiment, the installation No.1 level-sensing device 12 in No.1 ash bucket 11, No. two material positions of installation in No. two ash buckets 21
Meter 22, No. three level-sensing devices 32 of installation in No. three ash buckets 31, No. four level-sensing devices 42 of installation in No. four ash buckets 41, when No.1 ash bucket
11 half deposited ash quantity and highly reach the height of No.1 ash bucket 11, and the ash quantity of depositing of No. two ash buckets 21 highly reaches No. two ashes
The half for 21 height that struggle against, and the half deposited ash quantity and highly reach No. three height of ash bucket 31 of No. three ash buckets 31, and four
When depositing ash quantity and highly reaching the half of No. four height of ash bucket 41 of number ash bucket 41, high I values alarm is sent, and the defeated grey unit is opened
Begin defeated ash.
In the present embodiment, intake valve 6 is arranged on ash conveying pipe 5, when 13, No. two discharge valves 23, three of No.1 discharge valve
When number discharge valve 33 and No. four discharge valves 43 are opened, the storehouse pump 34 of storehouse pump 24, three of No.1 storehouse pump 14, two and No. four storehouse pumps 44
Start dress ash；The discharge valve 33 of discharge valve 23, three of No.1 discharge valve 13, two and No. four discharge valves 43 are turned off after 3s-5s, and one
Number storehouse pump 34 of storehouse pump 24, three of storehouse pump 14, two and No. four storehouse pumps 44 fill ash and terminated, and intake valve 6 is opened, in No.1 storehouse pump 14
Ash, the ash in No. two storehouse pumps 24, the ash in ash and No. four storehouse pumps 44 in No. three storehouse pumps 34 convey under the carrying of compressed air
To grey storehouse.
In the present embodiment, pump 14, No. two storehouse pumps 24, three in No.1 storehouse are judged according to the pressure of the compressed air of ash conveying pipe 5
Number storehouse pump 34 and No. four internal memory ash delivery situations of storehouse pump 44, when the pressure of ash conveying pipe 5 drops to 60% of pressure when defeated ash starts
Above and after stabilization, illustrate the ash in No.1 storehouse pump 14, the ash in No. two storehouse pumps 24, the ash in No. three storehouse pumps 34, No. four storehouse pumps
Ash conveying in ash and ash conveying pipe 5 in 44 is finished, and intake valve 6 is closed.
In the present embodiment, intake valve 6 is closed, the blanking of discharge valve 23, three of No.1 discharge valve 13, two of the defeated grey unit
Valve 33 and No. four discharge valves 43 continue on, the discharge valve 23, three of No.1 discharge valve 13, two discharge valve 33 and four after 3s-5s
Number discharge valve 43 is turned off, and electric precipitation continues defeated grey program.
In the present embodiment, when No.1 ash bucket 11 deposit ash quantity highly drop to 1/3rd of the height of No.1 ash bucket 11 with
Under, and deposit ash quantity and highly drop to No. two height of ash bucket 21 less than 1/3rd of No. two ash buckets 21, and No. three ash buckets 31
Ash quantity highly drops to No. three height of ash bucket 31 less than 1/3rd are deposited, and the ash quantity of depositing of No. four ash buckets 41 highly drops to four
Number height of ash bucket 41 less than 1/3rd when, high I value signals disappear, and the defeated grey unit terminates defeated ash.
In the present embodiment, if deposit ash quantity and rise to the height of No.1 ash bucket 11 2/3rds of No.1 ash bucket 11, and two
Deposit ash quantity and rise to No. two height of ash bucket 21 2/3rds of number ash bucket 21, and the ash quantity of depositing of No. three ash buckets 31 rises to No. three
2/3rds of the height of ash bucket 31, and when depositing ash quantity and rising to 2/3rds of No. four height of ash bucket 41 of No. four ash buckets 41, touch
Alarm of sending out II values high, then preferentially to the defeated grey defeated ash of unit, until alarm disappears.
In the present embodiment, when multiple defeated grey unit alarms, defeated ash is carried out according to the priority of alarm one by one, avoided more
Individual defeated grey unit while defeated ash, cause ash conveying pipe 5 to block.
In the present embodiment, " defeated ash is abnormal " alarm signal if defeated grey unit does not carry out defeated ash in 30min, is triggered,
The defeated grey unit performs defeated grey program, and after defeated grey program finishes execution, " defeated ash is abnormal " alarm signal disappears.
In the present embodiment, each defeated grey unit sets " Level control " mode switching button, when No.1 level-sensing device 12,
When any one level-sensing device breaks down or indicates abnormal in 22, No. three level-sensing devices 32 of No. two level-sensing devices and No. four level-sensing devices 42,
" Level control " defeated grey mode is exited, defeated grey program can return to each unit, and continuous defeated grey mode is run in turn.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to the utility model structure example explanation.
The equivalence changes or simple change that all construction, feature and the principle described according to the utility model patent design are done, are wrapped
Include in the protection domain of the utility model patent.The utility model person of ordinary skill in the field can be to described
Specific embodiment is made various modifications or supplement or substituted using similar mode, without departing from knot of the present utility model
Structure surmounts scope defined in the claims, all should belong to the scope of protection of the utility model.
Claims (3)
- A kind of 1. pneumatic ash conveying plant of thermal power plant's Level control, it is characterised in that：Including No.1 ash bucket, No. two ash buckets, No. three Ash bucket, No. four ash buckets, No.1 level-sensing device, No. two level-sensing devices, No. three level-sensing devices, No. four level-sensing devices, No.1 discharge valve, No. two blankings Valve, No. three discharge valves, No. four discharge valves, No.1 storehouse pump, No. two storehouse pumps, No. three storehouse pumps, No. four storehouse pumps, ash conveying pipe, intake valves； The No.1 level-sensing device is arranged in No.1 ash bucket, and the No.1 discharge valve is arranged on the bottom of No.1 ash bucket, the No.1 storehouse Pump is arranged on the bottom of No.1 discharge valve, and No. two level-sensing devices are arranged in No. two ash buckets, and No. two discharge valves are arranged on The bottom of No. two ash buckets, No. two storehouse pumps are arranged on the bottom of No. three discharge valves, and No. three level-sensing devices are arranged on No. three ashes In bucket, No. three discharge valves are arranged on the bottom of No. three ash buckets, and No. three storehouse pumps are arranged on the bottom of No. three discharge valves, institute No. four level-sensing devices are stated in No. four ash buckets, No. four discharge valves are arranged on the bottom of No. four ash buckets, No. four storehouse pumps Installed in the bottom of No. four discharge valves, the bottom of No.1 storehouse pump is connected by ash conveying pipe with the bottom of No. two storehouse pumps, institute The bottom for stating No. two storehouse pumps is connected by ash conveying pipe with the bottom of No. three storehouse pumps, and the bottom of No. three storehouse pumps passes through ash pipeline Road is connected with the bottom of No. four storehouse pumps, and the intake valve is arranged on ash conveying pipe.
- 2. the pneumatic ash conveying plant of thermal power plant's Level control according to claim 1, it is characterised in that：The No.1 material position It is calculated as ultrasonic material level detection unit or radar level gauge, No. two material positions are calculated as ultrasonic material level detection unit or radar level gauge, and described three Number material position is calculated as ultrasonic material level detection unit or radar level gauge, and No. four material positions are calculated as ultrasonic material level detection unit or radar level gauge.
- 3. the pneumatic ash conveying plant of thermal power plant's Level control according to claim 1, it is characterised in that：The ash conveying pipe On be connected with grey storehouse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720745932.8U CN207030441U (en) | 2017-06-26 | 2017-06-26 | A kind of pneumatic ash conveying plant of thermal power plant's Level control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720745932.8U CN207030441U (en) | 2017-06-26 | 2017-06-26 | A kind of pneumatic ash conveying plant of thermal power plant's Level control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207030441U true CN207030441U (en) | 2018-02-23 |
Family
ID=61469038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720745932.8U Active CN207030441U (en) | 2017-06-26 | 2017-06-26 | A kind of pneumatic ash conveying plant of thermal power plant's Level control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207030441U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110371680A (en) * | 2019-08-02 | 2019-10-25 | 江苏红光仪表厂有限公司 | A kind of defeated grey on-line measuring device of coal electric force and its logic control power-economizing method |
| CN114414873A (en) * | 2021-12-14 | 2022-04-29 | 中南仪表有限公司 | Single-phase remote cost control intelligent electric energy meter |
-
2017
- 2017-06-26 CN CN201720745932.8U patent/CN207030441U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110371680A (en) * | 2019-08-02 | 2019-10-25 | 江苏红光仪表厂有限公司 | A kind of defeated grey on-line measuring device of coal electric force and its logic control power-economizing method |
| CN114414873A (en) * | 2021-12-14 | 2022-04-29 | 中南仪表有限公司 | Single-phase remote cost control intelligent electric energy meter |
| CN114414873B (en) * | 2021-12-14 | 2023-05-05 | 中南仪表有限公司 | Single-phase remote fee-control intelligent electric energy meter |
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