CN113864173B - Novel water supply pump speed regulation device - Google Patents
Novel water supply pump speed regulation device Download PDFInfo
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- CN113864173B CN113864173B CN202110997607.1A CN202110997607A CN113864173B CN 113864173 B CN113864173 B CN 113864173B CN 202110997607 A CN202110997607 A CN 202110997607A CN 113864173 B CN113864173 B CN 113864173B
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- end cover
- rotating shaft
- water supply
- pump
- speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
Abstract
The invention provides a novel water feed pump speed regulating device, which comprises a water feed pump assembly, a water feed pump and a small turbine, wherein the water feed pump assembly comprises a water feed pump and the small turbine controls the rotating speed of the water feed pump; and the water supply pump assembly is arranged on the upper surface of the fixed table. The invention provides a high-speed motor for a small steam turbine, the high-speed motor can also be used as a generator under the action of a converter, when the small steam turbine is initially operated, when no steam source exists (other auxiliary steam of the unit can not meet the starting requirement of the unit, the generator is used as a motor), when the unit is stable in operation, the high-speed motor is used as a generator under the action of the converter, and throttling loss generated by controlling the rotating speed of a main throttle of the steam inlet can be converted into electric energy for plant power.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a novel water supply pump speed regulating device.
Background
At present, the feed water of the once-through boiler is sequentially passed through a heating zone, an evaporation zone and a superheating zone under the action of a feed water pump pressure head, and the feed water is completely converted into superheated steam at one time, and the circulation rate is equal to 1. In once-through boilers, the conversion of feedwater into superheated steam is accomplished in one pass. Thus, the evaporation amount of the boiler depends not only on the combustion rate but also on the feed water flow rate. Therefore, to meet the load change demand, feedwater flow control is one of the most basic means of controlling the main steam temperature at the boiler outlet. Because the supercritical unit adopts the direct-current boiler, fluctuation of water supply flow rate can have great influence on unit load, main steam pressure, main steam temperature and other important unit operation process parameters, and once the water supply pump is poor in speed regulation control, dynamic imbalance of the coal-water ratio can be caused. The feedwater flow regulation serves to control the overall energy balance of the boiler and maintain the separator outlet steam temperature to vary over a range. Large generator sets typically control the feedwater flow by varying the feedwater pump speed.
In the prior art, a unit set of a large-scale power plant is widely adopted to change the rotation speed of a water supply pump to adjust the water supply flow. The power of the steam feed pump is a small turbine, and the change of the rotating speed of the feed pump is realized by changing the inflow of the small turbine. The rotation speed of the small turbine is controlled by an electrohydraulic control system of an independent feed pump turbine. After receiving the boiler water supply flow or rotating speed signal, the conventional water supply pump set adjusts the rotating speed of the water supply pump set by controlling the opening of the steam inlet valve of the water supply pump turbine.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
Therefore, the technical problem to be solved by the invention is to overcome the defect of throttling loss in the prior art, thereby providing a novel water supply pump speed regulating device.
In order to solve the technical problems, the invention provides the following technical scheme: the novel water feed pump speed regulating device comprises a small steam turbine, wherein the small steam turbine is used for controlling the rotating speed of a water feed pump; the starting assembly is connected with the small steam turbine through the connecting assembly; and the connecting component is arranged at one end of the small steam turbine and comprises an end cover mechanism, a transmission mechanism and a disconnecting mechanism, a cavity is formed in the end cover mechanism, and the transmission mechanism and the disconnecting mechanism are positioned in the cavity.
As a preferable scheme of the novel water supply pump speed regulating device, the invention comprises the following steps: the starting assembly comprises a high-speed motor, a converter and a first rotating shaft, wherein the converter is electrically connected with the high-speed motor, and an output shaft of the high-speed motor is fixedly connected with the first rotating shaft.
As a preferable scheme of the novel water supply pump speed regulating device, the invention comprises the following steps: the small steam turbine is provided with a second rotating shaft on one side close to the starting assembly, and two ends of the connecting assembly are respectively connected with the first rotating shaft and the second rotating shaft.
As a preferable scheme of the novel water supply pump speed regulating device, the invention comprises the following steps: the end cover mechanism is characterized in that through holes are formed in two ends of the end cover mechanism, the first rotating shaft and the second rotating shaft extend into the end cover mechanism from the through holes, the transmission mechanism is connected with the first rotating shaft at one end inside the end cover mechanism, the transmission mechanism is far away from one end of the first rotating shaft and connected with the second rotating shaft, and the disconnecting mechanism is arranged on the transmission mechanism.
As a preferable scheme of the novel water supply pump speed regulating device, the invention comprises the following steps: the end cover mechanism comprises a first end cover and a second end cover, wherein a limiting clamping groove is formed in the first end cover, the limiting clamping groove is connected with the first end cover through bolts, and limiting protrusions are arranged at positions, close to the first end cover, of the second end cover in the circumferential direction.
As a preferable scheme of the novel water supply pump speed regulating device, the invention comprises the following steps: the transmission mechanism comprises a first friction block, a second friction block and a plurality of springs, wherein a circular sleeve is arranged on the first friction block, a plurality of grooves are radially formed in the inner wall of the circular sleeve along the circular sleeve, a limiting block is arranged at one end, far away from the high-speed motor, of the first rotating shaft and is matched with the grooves, one end of each spring is fixedly connected with one end of the first friction block, the other end of each spring is fixedly connected with the inner surface of the first end cover, and one end of each second friction block is fixedly connected with the second rotating shaft.
As a preferable scheme of the novel water supply pump speed regulating device, the invention comprises the following steps: the disconnecting mechanism comprises a connecting rod, a lever, a fixed block and a telescopic rod, wherein the fixed block is fixedly connected to the inner surface of the first end cover, the central position of the lever is movably connected to the fixed block, one end of the connecting rod is movably connected with one end of the lever, the other end of the connecting rod is fixedly connected with the first friction block, one end of the lever, which is far away from one end of the connecting rod, is movably connected with one end of the telescopic rod, and the telescopic rod is fixedly connected to the first end cover.
As a preferable scheme of the novel water supply pump speed regulating device, the invention comprises the following steps: one side of the feed pump is provided with a front-mounted pump assembly.
As a preferable scheme of the novel water supply pump speed regulating device, the invention comprises the following steps: the preposed pump assembly comprises a deaerator, a high-pressure feed water heater and a preposed pump, wherein a water inlet of the preposed pump is connected with the deaerator through a pipeline, one end of the feed water pump is fixedly connected with the preposed pump, and a water outlet of the feed water pump is connected with the high-pressure feed water heater.
As a preferable scheme of the novel water supply pump speed regulating device, the invention comprises the following steps: a reduction gear box is arranged between the front pump and the water supply pump.
The invention has the beneficial effects that: the invention provides a high-speed motor for a small steam turbine, the high-speed motor can also be used as a generator under the action of a converter, when the small steam turbine is initially operated, when no steam source exists (other auxiliary steam of the unit can not meet the starting requirement of the unit, the generator is used as a motor), when the unit is stable in operation, the high-speed motor is used as a generator under the action of the converter, and throttling loss generated by controlling the rotating speed of a main throttle of the steam inlet can be converted into electric energy for plant power.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic overall structure of embodiment 1;
FIG. 2 is a schematic structural diagram of embodiment 2;
FIG. 3 is a schematic cross-sectional view of the structure of the connecting assembly in embodiment 3;
FIG. 4 is an exploded view of the connecting assembly of example 3;
FIG. 5 is a schematic diagram of an interrupt mechanism according to embodiment 3;
FIG. 6 is a detailed view of the first shaft and first end cap of embodiment 3;
fig. 7 is a diagram showing the cooperation between the limiting slot and the limiting protrusion in embodiment 3.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Example 1
This embodiment provides a novel feed pump speed regulating device, as shown in fig. 1, comprising,
a feed pump 101 and a small turbine 102, the small turbine 102 controlling the rotational speed of the feed pump 101. The small turbine 102 changes the rotation speed of the feed pump 101 by changing the air intake flow of the small turbine 102, and the feed pump 101 adjusts the rotation speed of the feed pump 101 by controlling the opening of the steam intake valve of the small turbine 102 after receiving the boiler feed water flow or rotation speed signal. The small turbine 102 is provided with an air inlet pipeline, an air inlet valve is arranged in the air inlet pipeline, and the air inlet valve is controlled by an electrohydraulic control system of the turbine of the feed pump 101.
In the conventional engineering, auxiliary steam generated by other units is started by the small steam turbine 102 and is led into the small steam turbine 102 through an air inlet pipeline, and the steam enters the small steam turbine 102 to drive a rotor to rotate, so that the small steam turbine 102 starts to operate, and the small steam turbine 102 drives the water feed pump 101 to rotate.
A pre-pump assembly 400 is provided on one side of the feed pump 101.
The pre-pump assembly 400 comprises a deaerator 401, a high-pressure feed water heater 402 and a pre-pump 403, wherein a water inlet of the pre-pump 403 is connected with the deaerator 401 through a pipeline, one end of the feed water pump 101 is fixedly connected with the pre-pump 403, and a water outlet of the feed water pump 101 is connected with the high-pressure feed water heater 402. A reduction gear box 500 is provided between the pre-pump 403 and the feed pump 101.
The main function of the pre-pump 403 is to increase the pressure at the inlet of the feed pump 101, and prevent cavitation of the feed pump 101, and since the rotation speed of the pre-pump 403 is low, a double suction structure is generally adopted, so that the pump has good cavitation resistance. Deaerator 401 is a device for heating the feed water to a saturation temperature corresponding to the working pressure of deaerator 401, removing oxygen and other gases dissolved in the feed water, and preventing and reducing corrosion of boiler feed water pipes, economizers and other auxiliary equipment; the high-pressure feedwater heater 402 comprises a shell and a pipe system, wherein a steam condensing section is arranged at the upper part of an inner cavity of the shell, a hydrophobic cooling section is arranged at the lower part of the inner cavity of the shell, and a feedwater inlet and a feedwater outlet are arranged at the top ends of a water inlet pipe and a water outlet pipe. When the superheated steam enters the shell from the inlet, the water supply in the upper main spiral tube can be heated, after the steam is condensed into water, the condensed hot water can heat part of the water supply in the lower cooling spiral tube, and the utilized condensed water flows out of the body through the water drain outlet. The high pressure feedwater heater 402 has significant advantages of low energy consumption, compact structure, small footprint, low material consumption, and the like, and is capable of more tightly controlling the water drainage level, drainage flow rate, and reducing the water drainage end difference.
The prepositive pump 403 and the water feeding pump 101 are coaxially arranged, so that the transmission efficiency can be effectively improved, and meanwhile, the reduction gear box 500 is arranged between the prepositive pump 403 and the water feeding pump 101, so that the rotation speed ratio of the water feeding pump 101 to the prepositive pump 403 can be adjusted as required.
Example 2
The present embodiment provides a novel water pump speed regulating device, as shown in fig. 2, which is based on embodiment 1 but differs from embodiment 1 in that:
in the invention, a starting assembly 200 is arranged on one side of a feed pump 101, and the starting assembly 200 is fixedly connected with a small steam turbine 102. A connecting component 300 is arranged between the starting component 200 and the small turbine 102, a second rotating shaft 103 is arranged on one side of the small turbine 102 close to the starting component 200, and two ends of the connecting component 300 are respectively connected with the first rotating shaft 203 and the second rotating shaft 103.
Unlike embodiment 1, where the small turbine 102 is started by using auxiliary steam of other units, the starting assembly 200 is provided in this embodiment to directly start the small turbine 102, which is convenient and fast, and improves efficiency.
The starting assembly 200 comprises a high-speed motor 201, a current transformer 202 and a first rotating shaft 203, wherein the current transformer 202 is electrically connected with the high-speed motor 201, and an output shaft of the high-speed motor 201 is fixedly connected with the first rotating shaft 203. When the high-speed motor 201 is started initially, the high-speed motor 201 starts to rotate under the action of the converter 202, the small steam turbine 102 is driven to rotate through the connecting mechanism, the small steam turbine 102 is enabled to be started to the target rotating speed directly, when the small steam turbine 102 drives the water feeding pump 101 to rotate to a certain rotating speed to supply water for a boiler, when the boiler reaches a certain power, the converter 202 switches a circuit to enable the high-speed motor 201 to become a generator, at the moment, a rotor of the small steam turbine 102 drives the second rotating shaft 103 to rotate, the second rotating shaft 103 drives the first rotating shaft 203 to rotate through the connecting assembly 300, the first rotating shaft 203 drives the generator rotor to do cutting magnetic induction line movement inside the high-speed motor 201, and then power is supplied to a plant under the action of the converter 202. Wherein the converter 202 performs torque closed-loop control on the generator, and adjusts the braking torque of the generator. Under closed-loop control, the rotating speed of the feed pump 101 is combined with the calculation of the feedback rotating speed by the converter 202 (or through a speed sensor) and the comprehensive calculation by combining the system DCS torque, so that the rotating speed of the motor is adjusted by giving a torque set to the converter 202, and the rotating speed of the system tends to the speed set of the system. In the control mode, the system speed always follows the system setting, so that the function of system speed adjustment is achieved. Meanwhile, the braking power of the generator counteracts the residual power between the small steam turbine 102 and the water feeding pump 101, and the current in the converter 202 reversely flows to the input end of the converter 202 due to the reverse torque generated by the converter 202, so that the function of energy feedback is realized.
The invention is in actual operation: step one: when the unit is started, the converter 202 drives the high-speed motor 201 to start working, the output frequency of the high-speed motor is gradually increased from zero to the rated frequency, and the rotating speed is increased to the rated rotating speed; step two: when the small turbine 102 is started, the converter 202 does not run yet, the electrohydraulic control system of the turbine of the water feeding pump 101 sets the warm-up rotating speed of 800rpm as a target rotating speed, and the main regulating gate of the small turbine 102 is used for rotating speed control; step three: after the warm-up is completed, the electrohydraulic control system of the steam turbine of the feed pump 101 sets the lowest working rotation speed of the feed pump 101 as the target rotation speed; step four: when the feed pump 101 operates at the lowest working rotation speed, the electrohydraulic control system of the steam turbine of the feed pump 101 switches the rotation speed control of the small steam turbine 102 to an automatic control mode, at the moment, the boiler is still in wet state operation, the boiler feed water flow is controlled through the boiler feed water bypass regulating valve, and the rotation speed of the feed pump 101 is maintained at 3000rpm through the regulation of the main regulating valve of the small steam turbine 102; step five: when the unit load rises to 330MW, the boiler water supply bypass exits, the boiler water supply is switched to main pipe operation, namely, the rotation speed of the water supply pump 101 is used for adjusting, the converter 202 is put into, and the main regulating valve of the large and small turbines 102 is gradually opened at a given rising speed (200 rpm/min) until the main regulating valve of the small turbines 102 reaches the maximum opening.
The small turbine 102 is provided with a high-speed motor 201 and a converter 202, which are used for balancing redundant power between the small turbine 102 and the water feeding pump 101 group, according to the heat balance calculation of a main machine plant, the scheme of controlling the rotation speed of the water feeding pump 101 by the high-speed motor 201 and the converter 202 is adopted, the high-speed motor 201 has output under the working condition of 30% THA-VWO, the residual power reaches the maximum value of 16.58MW under the working condition of 75% THA, and the generator can be connected with the power supply of the plant to reduce the power consumption of the plant and improve the efficiency of the plant.
Example 3
The present embodiment provides a novel water pump speed regulating device, as shown in fig. 3-6, which is based on embodiments 1-2 but differs from the above embodiments in that:
the connecting assembly 300 comprises an end cover mechanism 301, a transmission mechanism 302 and a disconnecting mechanism 303, wherein a cavity is formed in the end cover mechanism 301, the transmission mechanism 302 and the disconnecting mechanism 303 are located in the cavity, one end of the transmission mechanism 302 is connected with the first rotating shaft 203, one end, far away from the first rotating shaft 203, of the transmission mechanism 302 is connected with the second rotating shaft 103, and the disconnecting mechanism 303 is arranged on the transmission mechanism 302.
The end cover mechanism 301 includes a first end cover 301a and a second end cover 301b, wherein the first end cover 301a is provided with a limit clamping groove 301a-1, the limit clamping groove 301a-1 is connected with the first end cover 301a by a bolt, and the position of the second end cover 301b close to the first end cover 301a is provided with a limit protrusion 301b-1 along the circumferential direction. In actual operation, the first end cap 301a is attached to the opening of the second end cap 301b, and then the limiting clamping groove 301a-1 is fixed, at this time, the limiting protrusion 301b-1 is just located in the groove 302a-11 of the limiting clamping groove 301a-1, and the edge of the limiting protrusion 301b-1 is attached to the side edge of the limiting clamping groove 301a-1 to limit the rotation of the first end cap 301a along the axial direction and the radial direction, but not limited to rotate along the center of a circle.
The transmission mechanism 302 comprises a first friction block 302a, a second friction block 302b and a plurality of springs 302c, wherein a circular sleeve 302a-1 is arranged on the first friction block 302a, a plurality of grooves 302a-11 are formed in the inner wall of the circular sleeve 302a-1 along the radial direction of the circular sleeve, a limiting block 203a is arranged at one end, far away from the high-speed motor 201, of the first rotating shaft 203, the limiting block 203a is matched with the grooves 302a-11, one end of each spring 302c is fixedly connected with one end of the first friction block 302a, the other end is fixedly connected with the inner surface of the first end cover 301a, and one end of each second friction block 302b is fixedly connected with the second rotating shaft 103. One end of the first rotating shaft 203 is provided with a limiting block 203a, the limiting block 203a is matched with the groove 302a-11 on the inner wall of the circular sleeve 302a-1, the side edge of the limiting block 203a is attached to the inner wall of the groove 302a-11, and further relative rotation between the first rotating shaft 203 and the first friction block 302a can not occur, but the first rotating shaft 203 is not influenced to move in the circular sleeve 302a-1 along the axial direction of the first rotating shaft. Since the distance between the first end cover 301a and the second end cover 301b is fixed, one end of the spring 302c is fixed on the inner wall of the first end cover 301a, and the other end of the spring 302c is fixed on the first friction block 302a, so that under the action of the spring 302c, the first friction block 302a is always tightly contacted with the second friction block 302b, and since the end surfaces of the first friction block 302a contacted with the second friction block 302b are all provided with materials with larger friction coefficients, for example: asbestos-based friction materials having a high coefficient of friction and capable of producing high friction. So when the second rotating shaft 103 rotates, the first rotating shaft 203 rotates together with the second rotating shaft 103 under the action of friction force; when the first rotation shaft 203 rotates, the second rotation shaft 103 rotates together with the first rotation shaft 203 by friction force. Therefore, the high-speed motor 201 can drive the small turbine 102 to rotate through the connecting mechanism, and the small turbine 102 can also drive the high-speed motor 201 to rotate.
The disconnecting mechanism 303 comprises a connecting rod 303a, a lever 303b, a fixed block 303c and a telescopic rod 303d, wherein the fixed block 303c is fixedly connected to the inner surface of the first end cover 301a, the center position of the lever 303b is movably connected to the fixed block 303c and can be in pin shaft connection, one end of the connecting rod 303a is movably connected with one end of the lever 303b, one end of the connecting rod 303a is connected to the lever 303b through a pin shaft, the other end of the connecting rod 303a is fixedly connected with the first friction block 302a, one end of the lever 303b, far away from the connecting rod 303a, is movably connected with one end of the telescopic rod 303d, the telescopic rod 303d is fixedly connected to the first end cover 301a, and one end of the telescopic rod 303d is connected with an electric control hydraulic cylinder through a hydraulic pipeline. One end of the connecting rod 303a is fixedly connected with the first friction block 302a, the other end of the connecting rod 303a is connected with the lever 303b, meanwhile, the lever 303b uses the fixed block 303c as a fulcrum, the other end of the lever 303b is connected with the telescopic rod 303d, the telescopic rod 303d is controlled by the electric control hydraulic cylinder 303e, so when the telescopic rod 303d stretches out, one end of the lever 303b connected with the telescopic rod 303d is forced to move in a direction away from the first end cover 301a, the other end of the lever 303b moves in a direction approaching the first end cover 301a, the connecting rod 303a is driven to move in a direction approaching the first end cover 301a, one end of the connecting rod 303a is connected with the first friction block 302a, the first friction block 302a moves in a direction approaching the first end cover 301a, the first friction block 302a is separated from the second friction block 302b, and power transmission between the starting assembly 200 and the water feeding pump 101 assembly 100 is cut off.
When the small turbine 102 runs at a high speed, the high-speed motor 201 is driven to generate power for a factory, when an emergency happens, the rotating speed of the small turbine 102 is unstable, so that huge vibration is caused to the high-speed motor 201, damage is caused to the high-speed motor 201, an operator only needs to start an electric control hydraulic cylinder switch, the electric control hydraulic cylinder drives a telescopic rod 303d to extend through a hydraulic pipe, the telescopic rod 303d pushes one end of a lever 303b to move towards a direction close to a first friction block 302a, the other end of the lever 303b drives a connecting rod 303a to move towards a direction far away from the first friction block 302a, at the moment, the connecting rod 303a drives the first friction block 302a to be separated from a second friction block 302b, power is cut off, the high-speed motor 201 is connected with the small turbine 102 and is disconnected, the high-speed motor 201 is not gradually stopped in vibration, and when the small turbine 102 runs normally, the electric control hydraulic cylinder is started to reset, so that the first friction block 302a is continuously contacted with the second friction block 302b, and power transmission between the high-speed motor 201 and the small turbine 102 is restored.
It is important to note that the construction and arrangement of the present application as shown in a variety of different exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the invention, or those not associated with practicing the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a novel feed pump speed governing device which characterized in that: comprising the steps of (a) a step of,
a small turbine (102), the small turbine (102) being used for controlling the rotational speed of the feed pump (101);
a start-up assembly (200), the start-up assembly (200) being connected to the small steam turbine (102) by a connection assembly (300); the method comprises the steps of,
the connecting assembly (300) is arranged at one end of the small steam turbine (102), the connecting assembly (300) comprises an end cover mechanism (301), a transmission mechanism (302) and a disconnecting mechanism (303), a cavity is formed in the end cover mechanism (301), and the transmission mechanism (302) and the disconnecting mechanism (303) are located in the cavity;
the end cover mechanism (301) is provided with through holes at two ends, the first rotating shaft (203) and the second rotating shaft (103) extend into the end cover mechanism (301) from the through holes, the transmission mechanism (302) is connected with the first rotating shaft (203) at one end inside the end cover mechanism (301), one end of the transmission mechanism (302) far away from the first rotating shaft (203) is connected with the second rotating shaft (103), and the disconnection mechanism (303) is arranged on the transmission mechanism (302);
the end cover mechanism (301) comprises a first end cover (301 a) and a second end cover (301 b), wherein a limiting clamping groove (301 a-1) is formed in the first end cover (301 a), the limiting clamping groove (301 a-1) is connected with the first end cover (301 a) through bolts, and a limiting protrusion (301 b-1) is arranged at a position, close to the first end cover (301 a), of the second end cover (301 b) along the circumferential direction;
the transmission mechanism (302) comprises a first friction block (302 a), a second friction block (302 b) and a plurality of springs (302 c), wherein a circular sleeve (302 a-1) is arranged on the first friction block (302 a), a plurality of grooves (302 a-11) are formed in the inner wall of the circular sleeve (302 a-1) along the radial direction of the circular sleeve, a limiting block (203 a) is arranged at one end, far away from the high-speed motor (201), of the first rotating shaft (203), the limiting block (203 a) is matched with the grooves (302 a-11), one end of each spring (302 c) is fixedly connected with one end of the first friction block (302 a), the other end of each spring is fixedly connected with the inner surface of the first end cover (301 a), and one end of each second friction block (302 b) is fixedly connected with the second rotating shaft (103);
the disconnecting mechanism (303) comprises a connecting rod (303 a), a lever (303 b), a fixed block (303 c) and a telescopic rod (303 d), wherein the fixed block (303 c) is fixedly connected to the inner surface of the first end cover (301 a), the central position of the lever (303 b) is movably connected to the fixed block (303 c), one end of the connecting rod (303 a) is movably connected with one end of the lever (303 b), the other end of the connecting rod (303 a) is fixedly connected with the first friction block (302 a), one end of the lever (303 b) is far away from one end of the connecting rod (303 a) and is movably connected with one end of the telescopic rod (303 d), and the telescopic rod (303 d) is fixedly connected to the first end cover (301 a).
2. The novel water supply pump speed regulating device according to claim 1, wherein the starting assembly (200) comprises a high-speed motor (201), a current transformer (202) and a first rotating shaft (203), the current transformer (202) is connected with the high-speed motor (201), and an output shaft of the high-speed motor (201) is fixedly connected with the first rotating shaft (203).
3. The novel water supply pump speed regulating device according to claim 2, wherein a second rotating shaft (103) is arranged on one side of the small steam turbine (102) close to the starting assembly (200), and two ends of the connecting assembly (300) are respectively connected with the first rotating shaft (203) and the second rotating shaft (103).
4. The novel water supply pump speed regulating device according to claim 1, wherein a pre-pump assembly (400) is arranged on one side of the water supply pump (101).
5. The novel water supply pump speed regulating device according to claim 4, wherein the pre-pump assembly (400) comprises a deaerator (401), a high-pressure water supply heater (402) and a pre-pump (403), a water inlet of the pre-pump (403) is connected with the deaerator (401) through a pipeline, one end of the water supply pump (101) is fixedly connected with the pre-pump (403), and a water outlet of the water supply pump (101) is connected with the high-pressure water supply heater (402).
6. The novel water supply pump speed regulating device according to claim 5, wherein a reduction gear box (500) is arranged between the pre-pump (403) and the water supply pump (101).
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| CA2885533A1 (en) * | 2012-09-21 | 2014-03-27 | Energy Recovery, Inc. | Hydraulic system with modular inserts |
| CN103398005B (en) * | 2013-08-13 | 2016-08-10 | 中国电力工程顾问集团华东电力设计院有限公司 | The pure condensate formula small turbine drive feed-water pump of frequency conversion generator speed governing and method |
| US9957828B2 (en) * | 2013-10-10 | 2018-05-01 | Weir Slurry Group, Inc. | Shaft seal assembly with contaminant detection system |
| CN205260334U (en) * | 2015-12-18 | 2016-05-25 | 广东粤电大埔发电有限公司 | Water pump system is given to 100% capacity steam -operating in large unit of power plant boiler |
| DE102017122549A1 (en) * | 2017-09-28 | 2019-03-28 | Voith Patent Gmbh | Drive device for driving a work machine |
| CN110397603B (en) * | 2019-08-03 | 2020-09-15 | 绍兴柯桥春生水务科技有限公司 | Water pump |
| CN110939576B (en) * | 2019-12-05 | 2020-10-20 | 新沂市利源机械有限公司 | Wear-resistant efficient horizontal centrifugal sand pump and working method thereof |
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