CN203655588U - Feed pump isolation system - Google Patents
Feed pump isolation system Download PDFInfo
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- CN203655588U CN203655588U CN201320817861.XU CN201320817861U CN203655588U CN 203655588 U CN203655588 U CN 203655588U CN 201320817861 U CN201320817861 U CN 201320817861U CN 203655588 U CN203655588 U CN 203655588U
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- Prior art keywords
- feed water
- water pump
- pump
- pressure
- temperature
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- 238000002955 isolation Methods 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 230000036760 body temperature Effects 0.000 claims description 42
- 230000015556 catabolic process Effects 0.000 claims description 12
- 238000006731 degradation reaction Methods 0.000 claims description 12
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
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- Control Of Positive-Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The utility model discloses a feed pump isolation system. The feed pump isolation system comprises a pressure sensor, a temperature sensor and a control device, wherein the pressure sensor is installed at an outlet of a feed pump and used for detecting the pressure of the outlet of the feed pump; the temperature sensor is installed on a pump body of the feed pump and used for detecting the temperature of the pump body of the feed pump; the control device is connected with the pressure sensor and the temperature sensor and used for controlling an inlet electric door of the feed pump and a sealing water switch according to the pressure of the outlet of the feed pump and the temperature of the pump body when an outlet electric door of the feed pump is closed. According to the feed pump isolation system, the reason for the rise of the pressure of the outlet of the feed pump can be judged more accurately by means of detection of the pressure of the outlet of the feed pump and the temperature of the pump body, and the situation that retreating time is prolonged due to judgment errors is prevented.
Description
Technical field
The utility model relates to the isolation technology of feed water pump, particularly, relates to a kind of feed water pump isolated system.
Background technique
Feed water pump is as one of thermal power plant Important Auxiliary equipment, longer if the standby time is moved back in maintenance, can directly affect the safe and stable operation of unit, if can isolate as quickly as possible feed water pump, can allow service work more successfully carry out, and makes unit stable operation more.At present feed water pump is moved back standby, while doing safety measure, general is all to take to isolate while the mode of lowering the temperature, until the pressure of the delivery side of pump power door operation that feeds water is zero and the pump body temperature of feed water pump while reaching the temperature that people can contact, staff just can keep in repair feed water pump.At present conventional electrically driven feedpump isolation comprises the following steps:
1) after electrically driven feedpump is stopped transport, make immediately electrically driven feedpump have a power failure, to prevent that electrically driven feedpump from starting suddenly, open afterwards pump housing discharging valve and discharge water;
2) close electrically driven feedpump outlet power door operation, make afterwards this outlet power door operation have a power failure, close afterwards entrance power door operation.When closing after entrance power door operation, observe electrically driven feedpump outlet pressure and whether raise, if do not raise, judge that electrically driven feedpump entrance and exit power door operation is tight, electrically driven feedpump entrance power door operation is had a power failure.
There is following shortcoming in the isolated system of the feed water pump of prior art:
1) in isolation feed water pump standard operation in the situation that closing entrance of water-supplying pump door, only notice whether feed water pump outlet pressure raises, and do not note the variation of feed water pump pump body temperature;
2) can not guarantee the time that feed water pump has been isolated.
Model utility content
The purpose of this utility model is to provide a kind of feed water pump isolated system, and this system is for solving the accurate problem that whether power door operation is tight and isolation time is long that judges feed water pump.
To achieve these goals, the utility model provides a kind of feed water pump isolated system, and this system comprises: pressure transducer, is installed on described feed water pump outlet port, for detection of described feed water pump outlet pressure; Temperature transducer, is installed on the pump housing of described feed water pump, for detection of the pump body temperature of described feed water pump; And control gear, be connected with described pressure transducer and described temperature transducer, for closing after described feedwater delivery side of pump power door operation, according to the entrance power door operation of feed water pump described in described feed water pump outlet pressure and described pump body temperature control and sealing water switch.
Preferably, described control gear comprises: pressure comparator, was connected with described pressure transducer, for the currency of described feed water pump outlet pressure and the value in a upper moment are compared; Temperature degradation detecting device, is connected with described temperature transducer, for detection of the rate of descent of described pump body temperature, and described rate of descent and predefined threshold speed is compared; Controller, be connected with described pressure comparator and described temperature degradation detecting device, be used for: be greater than the value in a moment and the rate of descent of described pump body temperature is greater than described threshold speed at the currency of the outlet pressure of described feed water pump, control and close described sealing water switch; The currency that records the outlet pressure of described feed water pump at described pressure comparator is greater than the value in a moment and the rate of descent of described pump body temperature is less than or equal to described threshold speed, controls described entrance power door operation and again closes; And the currency that records the outlet pressure of described feed water pump at described pressure comparator is less than or equal to the value in a moment, controls described entrance power door operation and have a power failure, and be to close sealing water switch at 1 o'clock at described outlet pressure.
By technique scheme, the utility model, by the detection of feed water pump outlet pressure and pump body temperature having been realized to the reason that judges that more exactly feed water pump outlet pressure raises, prevents from moving back the standby time because misjudgment increases.
Other feature and advantage of the present utility model are described in detail the embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 is the block diagram of the feed water pump isolated system that provides of the utility model; And
Fig. 2 is the block diagram of the feed water pump isolated system that provides of the utility model mode of execution.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the utility model, is not limited to the utility model.
Fig. 1 is the block diagram of the feed water pump isolated system that provides of the utility model, as shown in Figure 1, this system comprises pressure transducer, temperature transducer and control gear, wherein, pressure transducer is installed on the outlet port of feed water pump, for detecting feed water pump outlet pressure, temperature transducer is installed on the pump housing of feed water pump, for detecting the pump body temperature of feed water pump, control gear is connected with pressure transducer and temperature transducer simultaneously, closing after feedwater delivery side of pump power door operation, control the entrance power door operation of feed water pump and seal water switch according to feed water pump outlet pressure and pump body temperature.
Specifically, control gear receives pressure transducer and detects the feed water pump outlet pressure that obtains and temperature transducer and detect the pump body temperature of the feed water pump obtaining, in the case of the entrance power door operation of closing feed water pump, control gear judges whether feed water pump outlet pressure raises, if feed water pump outlet pressure does not raise, illustrate that entrance of water-supplying pump power door operation is tight, the entrance power door operation of control gear control feed water pump has a power failure, to prevent that entrance power door operation from opening by mistake.Be to close sealing water switch zero at the outlet pressure that moves back the feed water pump that after standby completing, pressure transducer records in this case.
On the other hand, in the case of the entrance power door operation of closing feed water pump, raise if control gear judgement obtains feed water pump outlet pressure, control gear continues the rate of descent of the pump body temperature that judges feed water pump.
Here can preset the threshold speed that pump body temperature declines, by the rate of descent of pump body temperature and the pump body temperature that relatively obtains of this threshold speed, whether rate of descent is too fast, if the rate of descent of pump body temperature is greater than this threshold speed, can determine that pump body temperature rate of descent is too fast, raise and pump body temperature rate of descent too fast in the situation that at feed water pump outlet pressure, sealing water switch is closed in control gear control, with prevent the pump housing because of temperature decrease impaired, the reason that this thing happens be the sealing water cooling feed water pump pump housing of feed water pump and cause feed water pump pump body temperature decline too fast, the feed water pump that is for example 180MW for power, its sealing coolant-temperature gage is generally 30 ℃, the temperature that can find out sealing water is lower, so the rate of descent in the situation lower pump body temperature that has sealing water to bleed will be very fast.If feed water pump outlet pressure raises and the rate of descent of pump body temperature is less than or equal to this threshold speed, illustrate that entrance power door operation is not closed completely close, this time-control apparatus control entrance power door operation is closed again.
In this, can also preset the threshold speed that different pump body temperature declines for different time sections, because in the time lowering the temperature for feed water pump, the in the situation that of the normal cooling of feed water pump, move back the residual higher water of temperature in a large number in the standby initial stage feed water pump pump housing, so emitted the higher water of these temperature and relatively moved back the standby later stage owing to moving back the standby initial stage, moving back standby initial stage pump body temperature declines very fast, therefore, in different time sections, the speed that pump body temperature declines is different, in order to make control more accurate, two or more threshold speeds can be set, for the different time periods.
Fig. 2 is the block diagram of the feed water pump isolated system that provides of the utility model mode of execution, and as shown in Figure 2, the control gear in this system comprises pressure comparator, temperature degradation detecting device and controller.
Wherein, pressure comparator is connected with pressure transducer, for the currency of feed water pump outlet pressure and the value in a upper moment are compared, thereby can judge whether obtain feed water pump outlet pressure raises.The currency that relatively obtains the outlet pressure of feed water pump at pressure comparator is greater than the value in a moment, the outlet pressure that can obtain feed water pump raises, thereby this pressure comparator is exported corresponding signal, for example, in the case of the outlet pressure of feed water pump raises, pressure comparator output high level, in the case of the outlet pressure of feed water pump does not raise, pressure comparator output low level.
Temperature degradation detecting device is connected with temperature transducer, for detection of the rate of descent of feed water pump pump body temperature, and rate of descent and predefined threshold speed is compared, and judges whether pump body temperature declines too fast.If the rate of descent of pump body temperature is greater than predefined threshold speed, the rate of descent that can obtain feed water pump pump body temperature is too fast, thereby this temperature degradation detecting device is exported corresponding signal, for example, in the case of the rate of descent of feed water pump pump body temperature is too fast, temperature degradation detecting device output high level, in the normal situation of rate of descent of feed water pump pump body temperature, temperature degradation detecting device output low level.
Controller is connected with pressure comparator and temperature degradation detecting device, controls entrance power door operation and the sealing water switch of feed water pump according to the comparative result of pressure comparator and temperature degradation detecting device.Specifically, in the case of the entrance power door operation of closing feed water pump, if obtaining feed water pump outlet pressure, pressure comparator do not raise, illustrate that entrance of water-supplying pump power door operation is tight, the entrance power door operation of the controlled feed water pump processed of this time-control apparatus has a power failure, to prevent that entrance power door operation from opening by mistake.On the other hand, in the case of the entrance power door operation of closing feed water pump, if obtaining the rate of descent that feed water pump outlet pressure raises and temperature degradation detecting device obtains pump body temperature, pressure comparator is greater than predefined threshold speed, sealing water switch is closed in controller control, the reason that this thing happens be the sealing water cooling feed water pump pump housing of feed water pump and cause feed water pump pump body temperature decline too fast.If feed water pump outlet pressure raises and the rate of descent of pump body temperature is less than or equal to this threshold speed, that is to say that the decline of pump body temperature is normal, illustrate that entrance power door operation is not closed completely close, this Time Controller control entrance power door operation is closed again.
In this, can preset the threshold speed that different pump body temperature declines for different time sections, because in the time lowering the temperature for feed water pump, the in the situation that of the normal cooling of feed water pump, in different time sections, the speed that pump body temperature declines is different, in order to make control more accurate, two or more threshold speeds can be set, for the different time periods.
It should be noted that, the utility model is mainly used in the isolation of thermal power plant electrically driven feedpump, and if only relate to the maintenance of feed water pump oil system, need the feed water pump auxiliary oil pump of stopping transport, then have a power failure.The above-mentioned situation that two or more threshold speeds can be set, it will be understood by those skilled in the art that these threshold speeds can arrange according to the experience of oneself.
Below describe by reference to the accompanying drawings preferred implementation of the present utility model in detail; but; the utility model is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
By the disclosed technological scheme of the utility model, in the time that needs confirm that whether feed water pump outlet power door operation is tight, not only whether feed water pump outlet pressure is raise and judged, also the rate of descent of the pump body temperature to feed water pump judges, has guaranteed to do the time of safety measure and moving back the standby time of feed water pump for feed water pump.
It should be noted that in addition each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible compound modes.
In addition, also can carry out combination in any between various mode of execution of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (2)
1. a feed water pump isolated system, is characterized in that, this system comprises:
Pressure transducer, is installed on described feed water pump outlet port, for detection of described feed water pump outlet pressure;
Temperature transducer, is installed on the pump housing of described feed water pump, for detection of the pump body temperature of described feed water pump; And
Control gear, is connected with described pressure transducer and described temperature transducer, for closing after described feedwater delivery side of pump power door operation, according to the entrance power door operation of feed water pump described in described feed water pump outlet pressure and described pump body temperature control and sealing water switch.
2. system according to claim 1, is characterized in that, described control gear comprises:
Pressure comparator, is connected with described pressure transducer, for the currency of described feed water pump outlet pressure and the value in a upper moment are compared;
Temperature degradation detecting device, is connected with described temperature transducer, for detection of the rate of descent of described pump body temperature, and described rate of descent and predefined threshold speed is compared;
Controller, is connected with described pressure comparator and described temperature degradation detecting device, for:
Be greater than the value in a moment and the rate of descent of described pump body temperature is greater than described threshold speed at the currency of the outlet pressure of described feed water pump, control and close described sealing water switch;
The currency that records the outlet pressure of described feed water pump at described pressure comparator is greater than the value in a moment and the rate of descent of described pump body temperature is less than or equal to described threshold speed, controls described entrance power door operation and again closes; And
The currency that records the outlet pressure of described feed water pump at described pressure comparator is less than or equal to the value in a moment, controls described entrance power door operation and has a power failure, and be to close sealing water switch at 1 o'clock at described outlet pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320817861.XU CN203655588U (en) | 2013-12-11 | 2013-12-11 | Feed pump isolation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320817861.XU CN203655588U (en) | 2013-12-11 | 2013-12-11 | Feed pump isolation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203655588U true CN203655588U (en) | 2014-06-18 |
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ID=50921981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320817861.XU Expired - Lifetime CN203655588U (en) | 2013-12-11 | 2013-12-11 | Feed pump isolation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203655588U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832419A (en) * | 2015-05-14 | 2015-08-12 | 苏州工业职业技术学院 | Water pump testing system |
| CN110285041A (en) * | 2019-06-24 | 2019-09-27 | 珠海思特自动化系统工程有限公司 | A kind of water supply pump house operation monitoring system and method |
| CN110542073A (en) * | 2019-07-25 | 2019-12-06 | 彩虹集团（邵阳）特种玻璃有限公司 | Method for determining standby time of standby steam boiler |
-
2013
- 2013-12-11 CN CN201320817861.XU patent/CN203655588U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104832419A (en) * | 2015-05-14 | 2015-08-12 | 苏州工业职业技术学院 | Water pump testing system |
| CN110285041A (en) * | 2019-06-24 | 2019-09-27 | 珠海思特自动化系统工程有限公司 | A kind of water supply pump house operation monitoring system and method |
| CN110542073A (en) * | 2019-07-25 | 2019-12-06 | 彩虹集团（邵阳）特种玻璃有限公司 | Method for determining standby time of standby steam boiler |
| CN110542073B (en) * | 2019-07-25 | 2021-05-18 | 彩虹集团（邵阳）特种玻璃有限公司 | Method for determining standby time of standby steam boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140618 |
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| CX01 | Expiry of patent term |