CN215486640U - Service frequency electric water feed pump mechanical seal life-prolonging structure - Google Patents
Service frequency electric water feed pump mechanical seal life-prolonging structure Download PDFInfo
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- CN215486640U CN215486640U CN202121427371.XU CN202121427371U CN215486640U CN 215486640 U CN215486640 U CN 215486640U CN 202121427371 U CN202121427371 U CN 202121427371U CN 215486640 U CN215486640 U CN 215486640U
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Abstract
The utility model relates to a mechanical seal life-prolonging structure of a power frequency electric water-feeding pump, which comprises an inlet pipeline and an outlet pipeline of the electric water pump; an inlet electric door of a water feed pump, a power frequency electric water feed pump booster pump and a variable frequency main water feed pump are sequentially arranged on the inlet pipeline of the electric water pump according to the water flow direction; the power frequency electric feed pump booster pump is connected in parallel with a pneumatic regulating valve for regulating the power frequency condensate pump outlet hydraulic head and a system flow regulating system; the system comprises a pneumatic regulating valve, a booster pump recirculation valve rear water drain valve and a booster pump recirculation valve rear manual gate, wherein the pneumatic regulating valve regulates a power frequency condensate outlet water pressure head and the system flow regulating system sequentially comprise the booster pump recirculation valve front manual gate, the booster pump recirculation valve rear water drain gate and the booster pump recirculation valve rear manual gate which are arranged on a regulating system pipeline according to the water flow direction. The utility model can obviously improve the vibration of the electric feed pump by reducing the water level pressure head, and prolong the service life of precision parts such as mechanical seal, bearings and the like.
Description
Technical Field
The utility model relates to the technical field of mechanical seals of water pumps, in particular to a service life prolonging structure of a mechanical seal of a power frequency electric water feed pump.
Background
The conventional design and model selection of the electric feed pump of the power plant are carried out according to the rated load of the unit, the new energy development trend is rapid along with the trend of coal power saturation, and the traditional thermal power plant is converted from a main power generator set to a basic generator set. The new energy industry has strong time-interval property in power generation, especially solar photovoltaic power generation is greatly influenced by illumination, the change rate of grid power load is high, higher requirements are provided for thermal power peak regulation, each parameter of deep peak regulation is seriously deviated from the designed operation mode of original equipment, and the operation condition of the equipment is unstable.
The electric water-feeding pump of the power plant is generally driven by a power frequency motor, the shaft end uses a mechanical seal, when the unit depth peak regulation is carried out, the unit load is deeply regulated to 30 percent or even lower, the output of the electric water-feeding pump is not adjustable under the drive of the motor, the vibration of the water pump is obviously increased, the axial float exists, the vibration of the bearing is obviously increased, the service life of each easily damaged spare part such as the bearing, the mechanical seal and the like is obviously reduced, and the overhaul and maintenance cost of the equipment is greatly increased. The cost for adding a frequency converter to the motor is high, and the implementation will not be strong.
SUMMERY OF THE UTILITY MODEL
The utility model provides a simple, reliable and low-investment transformation structure which can obviously reduce the pressure head of the outlet of the electric feed pump, the reduction of the water level pressure head can obviously improve the vibration of the electric feed pump, prolong the service life of mechanical seal, bearings and other precision parts, and reduce the maintenance cost of equipment.
The technical scheme of the utility model is as follows:
a mechanical seal life-prolonging structure of a power frequency electric water-feeding pump comprises an inlet pipeline and an outlet pipeline of the electric water pump;
an inlet electric door of a water feed pump, a power frequency electric water feed pump booster pump and a variable frequency main water feed pump are sequentially arranged on the inlet pipeline of the electric water pump according to the water flow direction;
the power frequency electric feed pump booster pump is connected in parallel with a pneumatic regulating valve for regulating the power frequency condensate pump outlet hydraulic head and a system flow regulating system;
the system comprises a pneumatic regulating valve, a booster pump recirculation valve rear water drain valve and a booster pump recirculation valve rear manual gate, wherein the pneumatic regulating valve regulates a power frequency condensate outlet water pressure head and the system flow regulating system sequentially comprise the booster pump recirculation valve front manual gate, the booster pump recirculation valve rear water drain gate and the booster pump recirculation valve rear manual gate which are arranged on a regulating system pipeline according to the water flow direction.
Preferably, a main pump inlet pressure measuring point and a water supply flowmeter are arranged between the power frequency electric water supply pump booster pump and the variable frequency main water supply pump.
Preferably, an electric door of an outlet of the water feed pump set is arranged between the variable-frequency main water feed pump and the manual door in front of the minimum flow valve.
Preferably, according to the water flow direction, a front manual door of the minimum flow valve, a rear water drain door of the minimum flow valve and a rear manual door of the minimum flow valve are sequentially arranged on an outlet pipeline of the electric water pump.
Preferably, the electric water pump inlet pipeline is connected with the outlet of the deaerator, and the electric water pump outlet pipeline is connected with the inlet of the deaerator.
The utility model has the beneficial effects that:
the utility model is simple and reliable, has less investment, can obviously reduce the modification mode of the outlet pressure head of the electric feed pump, can obviously improve the vibration of the electric feed pump by reducing the water level pressure head, prolongs the service life of mechanical seal, bearings and other precise parts, and reduces the maintenance cost of equipment.
1. In the utility model, the single-action pneumatic regulating valve is used for regulating the outlet hydraulic head of the power frequency condensate pump and the flow of the system, thereby ensuring the stable operation of the system.
2. The utility model can greatly reduce the service life of the precise and expensive parts such as the mechanical seal, the bearing and the like of the electric water pump, and save the maintenance cost.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
11-a water feed pump inlet electric door, 12-power frequency electric water feed pump booster pump, 13-variable frequency main water feed pump, 14-a main pump inlet pressure measuring point and 15-a water feed flowmeter;
21-a front manual door of the minimum flow valve, 22-the minimum flow valve, 23-a rear water drain door of the minimum flow valve, and 24-a rear manual door of the minimum flow valve;
a 31-booster pump recirculation valve front manual door, a 32-booster pump recirculation valve, a 33-booster pump recirculation valve rear water drain door and a 34-booster pump recirculation valve rear manual door;
4-an electric door at the outlet of the water feed pump set.
Detailed Description
As shown in fig. 1, a mechanical seal life-prolonging structure of a power frequency electric water-feeding pump comprises an inlet pipeline and an outlet pipeline of the electric water pump;
a water feed pump inlet electric door 11, a power frequency electric water feed pump booster pump 12 and a variable frequency main water feed pump 13 are sequentially arranged on the electric water pump inlet pipeline according to the water flow direction;
the power frequency electric feed pump booster pump 12 is connected in parallel with a pneumatic regulating valve for regulating the power frequency condensate pump outlet hydraulic head and a system flow regulating system;
the system for adjusting the power frequency condensate outlet water pressure head by the pneumatic adjusting valve and adjusting the system flow sequentially comprises a booster pump recirculation valve front manual door 31, a booster pump recirculation valve 32, a booster pump recirculation valve rear water drain door 33 and a booster pump recirculation valve rear manual door 34 which are arranged on an adjusting system pipeline according to the water flow direction.
Preferably, a main pump inlet pressure measuring point 14 and a feed water flowmeter 15 are arranged between the power frequency electric feed water pump booster pump and the variable frequency main feed water pump.
Preferably, a front manual valve 21 of the minimum flow valve, a minimum flow valve 22, a rear water drain valve 23 of the minimum flow valve and a rear manual valve 24 of the minimum flow valve are sequentially arranged on an outlet pipeline of the water feed pump set according to the water flow direction.
Preferably, a feed pump set outlet electric door 4 is arranged between the variable-frequency main feed water pump 13 and the front manual door 21 of the minimum flow valve.
Preferably, the electric water pump inlet pipeline is connected with the outlet of the deaerator, and the electric water pump outlet pipeline is connected with the inlet of the deaerator.
The utility model can reduce the outlet pressure head of the electric water feed pump, increase the opening degree of the recirculation valve of the power frequency electric water pump as much as possible on the premise of meeting the outlet pressure of the power frequency electric water pump and the required parameters of the system flow, reduce the water level pressure head of the system to the maximum extent, solve the problem of parameter matching of the system and improve the safety of the electric water pump.
The utility model discloses a high-pressure water of the electronic water pump inlet pipeline of power frequency is drawn forth all the way from the electronic water pump outlet pipeline of power frequency of mechanical seal form, through the preceding manual door 31 of booster pump recirculation valve of additional installation, booster pump recirculation valve 32, booster pump recirculation valve back drain 33 and booster pump recirculation valve back manual door 34 regulation power frequency electronic water pump booster pump 12 outlet pressure, under the prerequisite of guaranteeing power frequency electronic water pump booster pump 12 outlet pressure head and system flow demand, furthest reduces power frequency pump outlet water pressure head, increase flow through opening booster pump recirculation valve 32, make partial feedwater at power frequency electronic water pump booster pump 12 extrinsic cycle, make power frequency water pump rotational speed and feedwater total flow phase-match, prevent power frequency condensate pump axial float by a wide margin, reduce the water pump vibration, extension mechanical seal life.
The booster pump recirculation valve 32 is an air-open spring-closed control valve, when a control air source (or a control power source) is lost, the valve can be closed reliably and quickly by means of the mechanical thrust of a spring, a large differential pressure ratio control mechanism can ensure that the leakage rate is 0 when the booster pump recirculation valve 32 is closed, a front booster pump recirculation valve manual valve 31 and a rear booster pump recirculation valve manual valve 34 are respectively arranged at the front and the rear of the booster pump recirculation valve 32, a rear booster pump recirculation valve water drain valve 33 is arranged at the rear of the booster pump recirculation valve 32, and the booster pump recirculation valve water drain valve is convenient to use during system maintenance.
The steam pump recirculation system is arranged on an outlet pipeline of the steam-driven water supply main pump and is used for ensuring the minimum flow of the water supply pump set, the system is automatically put into use when the flow of the system is lower than the minimum flow fixed value of the water supply pump set, the water supply pump set is prevented from serious cavitation and even tripping the pump, and the steam pump recirculation pipeline returns water to the inside of the deaerator. The minimum flow valve 22 is an air-closed spring quick-opening valve and is quickly opened when a control air source (or a control power supply) is lost. The minimum flow valve 22 is a labyrinth pilot type pressure reducing valve, which can reduce the pressure of high-pressure water to a pressure close to the deaerator, and because the front and rear differential pressure of the valve bank is large, the flushing of the valve internals is quick, the service life is short, and the maintenance cost is high. The front manual door 21 of the minimum flow valve and the rear manual door 24 of the minimum flow valve are used for turning off when the minimum flow valve is overhauled or debugged, and the rear waterproof door 23 of the minimum flow valve is used for system overhaul.
By attempting to open use, the frequency of use of the minimum flow valve 22 can be reduced by maximizing the opening of the booster pump recirculation valve 32.
The newly-added spare water distribution point and the water collection point are both positioned in front and rear isolating valves of the water supply pump set, and the water supply pump set can be isolated when the system is abnormal and the isolating points are not newly added.
Claims (5)
1. A mechanical seal life-prolonging structure of a power frequency electric water-feeding pump is characterized by comprising an inlet pipeline and an outlet pipeline of the electric water pump;
an inlet electric door of a water feed pump, a power frequency electric water feed pump booster pump and a variable frequency main water feed pump are sequentially arranged on the inlet pipeline of the electric water pump according to the water flow direction;
the power frequency electric feed pump booster pump is connected in parallel with a pneumatic regulating valve for regulating the power frequency condensate pump outlet hydraulic head and a system flow regulating system;
the system comprises a pneumatic regulating valve, a booster pump recirculation valve rear water drain valve and a booster pump recirculation valve rear manual gate, wherein the pneumatic regulating valve regulates a power frequency condensate outlet water pressure head and the system flow regulating system sequentially comprise the booster pump recirculation valve front manual gate, the booster pump recirculation valve rear water drain gate and the booster pump recirculation valve rear manual gate which are arranged on a regulating system pipeline according to the water flow direction.
2. The mechanical seal life-prolonging structure of the power-frequency electric water-feeding pump as claimed in claim 1, wherein a main pump inlet pressure measuring point and a water-feeding flow meter are arranged between the power-frequency electric water-feeding pump booster pump and the variable-frequency main water-feeding pump.
3. The mechanical seal life-prolonging structure of the power frequency electric water-feeding pump according to claim 1,
and according to the water flow direction, a front manual door of the minimum flow valve, a rear water drain door of the minimum flow valve and a rear manual door of the minimum flow valve are sequentially arranged on an outlet pipeline of the electric water pump.
4. The mechanical seal service life prolonging structure of the power frequency electric water feed pump according to claim 3, wherein an electric outlet door of the water feed pump group is arranged between the variable frequency main water feed pump and the manual door in front of the minimum flow valve.
5. The mechanical seal life-prolonging structure of the power-frequency electric water-feeding pump according to any one of claims 1 to 4, wherein an inlet pipeline of the electric water pump is connected with an outlet of a deaerator, and an outlet pipeline of the electric water pump is connected with an inlet of the deaerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121427371.XU CN215486640U (en) | 2021-06-25 | 2021-06-25 | Service frequency electric water feed pump mechanical seal life-prolonging structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121427371.XU CN215486640U (en) | 2021-06-25 | 2021-06-25 | Service frequency electric water feed pump mechanical seal life-prolonging structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215486640U true CN215486640U (en) | 2022-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121427371.XU Active CN215486640U (en) | 2021-06-25 | 2021-06-25 | Service frequency electric water feed pump mechanical seal life-prolonging structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215486640U (en) |
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2021
- 2021-06-25 CN CN202121427371.XU patent/CN215486640U/en active Active
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