CN105490616A - Circuit structure for boiler blower capable of automatically switching to power frequency from variable frequency - Google Patents
Circuit structure for boiler blower capable of automatically switching to power frequency from variable frequency Download PDFInfo
- Publication number
- CN105490616A CN105490616A CN201610013801.0A CN201610013801A CN105490616A CN 105490616 A CN105490616 A CN 105490616A CN 201610013801 A CN201610013801 A CN 201610013801A CN 105490616 A CN105490616 A CN 105490616A
- Authority
- CN
- China
- Prior art keywords
- frequency
- power frequency
- boiler
- circuit structure
- frequency converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention relates to the field of electrical technology, in particular to a circuit structure for a boiler blower capable of automatically switching to a power frequency from a variable frequency. The circuit structure is short in flow and easy to control, and can automatically switch to the power frequency for operation when the boiler blower is in a variable frequency fault jump, so that continuous operation of the boiler blower is ensured. According to the technical scheme, the circuit structure for the boiler blower capable of automatically switching to the power frequency from the variable frequency comprises a user switch, a frequency converter, the boiler blower and an automatic power frequency bypass, wherein the user switch, the frequency converter and the boiler blower are electrically connected; the automatic power frequency bypass is electrically connected to two ends of the frequency converter; and the automatic power frequency bypass and the frequency converter are connected with a control system for a boiler.
Description
Technical field
The present invention relates to technical field of electricity, specifically a kind of boiler fan is converted to the circuit structure that power frequency automatically switches.
Background technology
High voltage converter is not only energy-conservation but also can reduce the wearing and tearing of equipment, simultaneously easy to adjust, be widely used in the middle of boiler fan operation, but existing domestic high voltage AC converter technology also imperfection, failure rate is higher, has badly influenced the reliable and stable row that boiler runs continuously.
Summary of the invention
The object of the invention is the deficiency overcome in background technology, the circuit structure of a kind of boiler fan from being converted to power frequency automatic switchover is provided, this circuit structure short flow, easily to control, can power frequency operation be automatically switched to when boiler fan frequency conversion fault jumps car, ensure that boiler fan runs continuously.
The technical solution used in the present invention is as follows: a kind of boiler fan is converted to the circuit structure that power frequency automatically switches, comprise the subscriber switch of electrical connection, frequency converter and boiler fan, it is characterized in that: also comprise the Auto power frequency bypass being connected electrically in frequency converter two ends, this Auto power frequency bypass and being all connected with the control system of described boiler with frequency converter.
Described Auto power frequency bypass is by No. one that is connected with described control system, No. two isolating switches, and No. one, No. two vacuum circuit-breakers and vacuum contactor form; Wherein subscriber switch, a vacuum circuit-breaker, an isolating switch are connected electrically in the front end of frequency converter successively, No. two isolating switches, vacuum contactor and boiler fans are connected electrically in the rear end of frequency converter successively, and No. two vacuum circuit-breakers are connected electrically in the front end of a vacuum circuit-breaker and the rear end of vacuum contactor.
The beneficial effect that the present invention has is: the present invention adopts Auto power frequency bypass, after boiler fan converting operation, produce fault automatically switch to power frequency operation, prior art contrasts, structure of the present invention is simple, short flow, easily to control, can power frequency operation be automatically switched to when boiler fan frequency conversion fault jumps car, thus ensure that boiler fan runs continuously.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention.
Embodiment
Below in conjunction with Figure of description, the invention will be further described, but the present invention is not limited to following examples.
As shown in Figure 1, a kind of boiler fan is converted to the circuit structure that power frequency automatically switches, and comprises the subscriber switch QF of electrical connection, frequency converter 1 and boiler fan 2.Also comprise the Auto power frequency bypass being connected electrically in frequency converter two ends, this Auto power frequency bypass and being all connected with the control system of described boiler with frequency converter, can power frequency operation be automatically switched to when boiler fan frequency conversion fault jumps car.
Described Auto power frequency bypass is by No. one that is connected with described control system, No. two isolating switches QS1, QS2, and No. one, No. two vacuum circuit-breakers QF1, QF2 and vacuum contactor KM1 form; Wherein subscriber switch, a vacuum circuit-breaker, an isolating switch are connected electrically in the front end of frequency converter successively, No. two isolating switches, vacuum contactor and boiler fans are connected electrically in the rear end of frequency converter successively, and No. two vacuum circuit-breakers are connected electrically in the front end of a vacuum circuit-breaker and the rear end of vacuum contactor.
In described Auto power frequency bypass, when isolating switch QS1, QS2 and vacuum circuit-breaker QF1, QF2 disconnect, vacuum circuit-breaker QF1, vacuum contactor KM1 do not close; Vacuum circuit-breaker QF2 and vacuum contactor KM1 interlocks, and vacuum circuit-breaker QF2 and vacuum circuit-breaker QF1 does not interlock.
Operation principle of the present invention is: frequency conversion switches in power frequency process, first disconnected vacuum circuit-breaker QF1, more disconnected vacuum contactor KM1; Then vacuum circuit-breaker QF2 is closed, motor power frequency operation;
Failover is only limitted to switch power frequency when frequency converter failure is shut down; when frequency converter failure trip signal is sent in DCS system; DCS system starts power frequency automatically, and in power frequency startup process, DCS system closes baffle door automatically, in the baffle door process of pass, maintain combustion chamber draft within the limits prescribed.
The foregoing is only the preferred embodiments of the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a boiler fan is converted to the circuit structure that power frequency automatically switches, comprise the subscriber switch (QF) of electrical connection, frequency converter (1) and boiler fan (2), it is characterized in that: also comprise the Auto power frequency bypass being connected electrically in frequency converter two ends, this Auto power frequency bypass and being all connected with the control system of described boiler with frequency converter.
2. a kind of boiler fan according to claim 1 is converted to the circuit structure that power frequency automatically switches, it is characterized in that: described Auto power frequency bypass is by No. one that is connected with described control system, No. two isolating switches (QS1, QS2), and No. one, No. two vacuum circuit-breakers (QF1, QF2) and vacuum contactor (KM1) form;
Wherein subscriber switch (QF), a vacuum circuit-breaker (QF1), an isolating switch (QS1) are connected electrically in the front end of frequency converter successively, No. two isolating switches (QS2), vacuum contactor (KM1) and boiler fans are connected electrically in the rear end of frequency converter successively, and No. two vacuum circuit-breakers (QF2) are connected electrically in the front end of a vacuum circuit-breaker (QF1) and the rear end of vacuum contactor (KM1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610013801.0A CN105490616A (en) | 2016-01-11 | 2016-01-11 | Circuit structure for boiler blower capable of automatically switching to power frequency from variable frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610013801.0A CN105490616A (en) | 2016-01-11 | 2016-01-11 | Circuit structure for boiler blower capable of automatically switching to power frequency from variable frequency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105490616A true CN105490616A (en) | 2016-04-13 |
Family
ID=55677398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610013801.0A Pending CN105490616A (en) | 2016-01-11 | 2016-01-11 | Circuit structure for boiler blower capable of automatically switching to power frequency from variable frequency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105490616A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111490538A (en) * | 2020-04-23 | 2020-08-04 | 西安热工研究院有限公司 | Accident switching method suitable for primary air fan frequency conversion/power frequency switching system |
| CN112615571A (en) * | 2020-12-08 | 2021-04-06 | 西安热工研究院有限公司 | Frequency conversion and power frequency switching control method for induced draft fan of garbage power plant |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5705904A (en) * | 1996-03-28 | 1998-01-06 | Mitsubishi Denki Kabushiki Kaisha | Frequency converter device which adaptively responds to a power failure |
| CN202260450U (en) * | 2011-09-30 | 2012-05-30 | 中国石油化工股份有限公司 | Thermal-electric plant boiler high-pressure fan online power frequency/frequency conversion operation switch device |
| CN103051282A (en) * | 2012-08-23 | 2013-04-17 | 上海外高桥第二发电有限责任公司 | Variable-frequency and industrial frequency switching device and switching method of Variable-frequency and industrial frequency switching device |
| CN205265586U (en) * | 2016-01-11 | 2016-05-25 | 宁波中金石化有限公司 | Circuit structure of power frequency automatic switch -over is arrived in frequency conversion of boiler fan |
-
2016
- 2016-01-11 CN CN201610013801.0A patent/CN105490616A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5705904A (en) * | 1996-03-28 | 1998-01-06 | Mitsubishi Denki Kabushiki Kaisha | Frequency converter device which adaptively responds to a power failure |
| CN202260450U (en) * | 2011-09-30 | 2012-05-30 | 中国石油化工股份有限公司 | Thermal-electric plant boiler high-pressure fan online power frequency/frequency conversion operation switch device |
| CN103051282A (en) * | 2012-08-23 | 2013-04-17 | 上海外高桥第二发电有限责任公司 | Variable-frequency and industrial frequency switching device and switching method of Variable-frequency and industrial frequency switching device |
| CN205265586U (en) * | 2016-01-11 | 2016-05-25 | 宁波中金石化有限公司 | Circuit structure of power frequency automatic switch -over is arrived in frequency conversion of boiler fan |
Non-Patent Citations (1)
| Title |
|---|
| 张文海等: ""东方日立变频器和工频自动旁路在引风机调速中的设计和应用"", 《变频器世界》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111490538A (en) * | 2020-04-23 | 2020-08-04 | 西安热工研究院有限公司 | Accident switching method suitable for primary air fan frequency conversion/power frequency switching system |
| CN112615571A (en) * | 2020-12-08 | 2021-04-06 | 西安热工研究院有限公司 | Frequency conversion and power frequency switching control method for induced draft fan of garbage power plant |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160413 |
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| WD01 | Invention patent application deemed withdrawn after publication |