CN107387360B - Plunger pump water supply system and control method thereof - Google Patents

Plunger pump water supply system and control method thereof Download PDF

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Publication number
CN107387360B
CN107387360B CN201710451432.8A CN201710451432A CN107387360B CN 107387360 B CN107387360 B CN 107387360B CN 201710451432 A CN201710451432 A CN 201710451432A CN 107387360 B CN107387360 B CN 107387360B
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China
Prior art keywords
plunger
plunger pump
time interval
pump
pumps
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CN107387360A (en
Inventor
钟辉平
魏志魁
陈城
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Sany Automobile Manufacturing Co Ltd
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Sany Automobile Manufacturing Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00Pumping installations or systems
    • F04B23/04Combinations of two or more pumps
    • F04B23/06Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, 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
    • F04B49/06Control using electricity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, 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
    • F04B49/22Control, 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 means of valves

Abstract

The invention provides a plunger pump water supply system and a control method thereof, wherein the plunger pump water supply system comprises N plunger pumps, an oil pump, a reversing valve and a controller, wherein each plunger pump comprises an oil cylinder and a water cylinder which are connected through a piston rod; the controller is used for controlling the starting time sequence and the reversing time interval of the N plunger pumps through the reversing valve according to signals of the position sensor, and is used for adjusting the running speed of at least one plunger pump when the reversing time interval of one or more plunger pumps exceeds a preset reversing time interval by a certain deviation. The plunger pump water supply system and the control method thereof adopt closed-loop control, can ensure that N plunger pumps act according to the designed starting time sequence and the reversing time interval, and can be adjusted in time when the reversing time interval has deviation, and have good water supply continuity and small flow pulsation.

Description

Plunger pump water supply system and control method thereof
Technical Field
The invention relates to the technical field of plunger pump water supply, in particular to a plunger pump water supply system and a control method thereof.
Background
With the rapid development of domestic economy, people gather in cities more and more quickly, the height of commercial and civil super high-rise buildings is continuously increased, and the high-rise buildings are fiercely and rapidly spread during fire due to high height, multiple layers, complex structure and centralized personnel concentration, so that three-dimensional combustion is easily formed, and great difficulty is brought to fire extinguishment. The fire fighting device can put out high-rise building fire, can supply water to a fire scene timely and uninterruptedly, meets the water quantity and water pressure required by fire extinguishing, and is directly related to success or failure of fire extinguishing and rescue. Obviously, the fire fighting equipment with powerful functions is needed for fighting the fire of the super high-rise building.
When a fire disaster happens to the existing super high-rise building, three fire extinguishing schemes are generally available.
(1) The water is directly supplied by utilizing the mobile fire-fighting equipment. When fixed fire-fighting equipment in a building can not meet normal use or can not meet the requirement of fire-fighting water, a fire fighter can only directly supply water by utilizing a fire fighting truck organization by laying a water hose vertically. (2) The water supply is realized by combining the movable fire-fighting equipment with the fixed fire-fighting equipment. When the fixed fire pump can not normally operate or the indoor fire-fighting water supply can not meet the fire-fighting requirement, the fire engine is used for supplying water to a fire-fighting pipe network of a building through the water pump adapter, but the pressure of the water supply needs to be reduced. (3) The water is supplied by fixed fire-fighting facilities. The super high-rise building takes place the conflagration, and when the fire fighter arrived at the scene, if the external observation intensity of a fire is not big, should carry hosepipe, squirt and interface immediately, utilize the fire elevator to ascend a height rapidly to the layer of catching fire, directly use indoor fire hydrant to put out a fire, start fire pump simultaneously and supply water to indoor fire control pipe network.
The three modes are limited by the water supply pressure and flow of fire-fighting equipment (the maximum water supply pressure of a fire truck is about 2.0MPa generally, the maximum water supply pressure of an indoor fire hydrant is about 2.5MPa generally, and the water supply flow is 40L/s), and the water supply height is below 250 meters generally in consideration of the on-way loss of a pipeline, so that the requirement of fire fighting of a super high-rise building with the height of more than 250 meters cannot be met.
In order to meet the requirements of fire fighting and extinguishing of super high-rise buildings, the Chinese patent application with the patent number of 201110273188.3 discloses a fixed fire fighting system for high-rise buildings, which comprises a pump room and a fire fighting vertical pipe arranged in the high-rise buildings, wherein a plunger pump is arranged in the pump room, and the flow and pressure requirements of super high-rise water supply are met through the alternate work of the plunger pump. However, due to the limitation of reversing time, the pump has low pumping continuity and often has a phenomenon of 'flow interruption', so that the fire extinguishing effect on high-rise buildings or super high-rise buildings is not ideal.
In the prior art, there is also a plunger pump set (for example, the chinese patent application with application number 201110348257.2) which alternately reverses, each of the plunger pumps alternately reverses, when one plunger pump reaches a reversing position, there is a plunger pump which starts to pump a medium, and at this time, the other remaining plunger pumps are all in the middle of the operation of pumping the medium, so that n-1 plunger pumps are in operation of pumping the medium at any time; the structural design of the pumping system can improve the continuity of medium pumping on the basis of ensuring the flow and the pressure, and further prevent the occurrence of a cutoff phenomenon. Two problems remain:
(1) due to the fact that a plurality of plunger pumps have certain individual differences or oil cylinder internal leakage and the like, the speed of the plunger pumps changes, and the common plunger pumps adopt proximity switches for reversing or are difficult to coordinate multi-cylinder reversing time through oil pressure reversing.
(2) The hydraulic system is controlled in an open loop mode, the speed of the oil cylinder cannot be monitored and adjusted in time, and the flow of the oil pump in actual work cannot be evenly distributed to each plunger pump according to an ideal state, so that the problem that 2 or more than 2 oil cylinders are reversed at the same time in continuous operation of equipment is necessarily caused, and the water supply continuity of the equipment is greatly reduced.
Disclosure of Invention
In view of the above, the present invention is directed to a plunger pump water supply system and a control method thereof, so as to improve at least one of continuity and reliability of water supply.
On one hand, the invention provides a plunger pump water supply system which comprises N plunger pumps, an oil pump for driving the N plunger pumps to supply water, a reversing valve for independently controlling each plunger pump and a controller, wherein N is an integer greater than or equal to 2, and each plunger pump comprises an oil cylinder (10-2) and a water cylinder (10-3) which are connected through a piston rod; the plunger pump control system is characterized by further comprising position sensors, wherein the position sensors are used for acquiring the moving positions of piston rods of the plunger pumps, the signal output ends of the position sensors are connected with the controller, the signal output end of the controller is connected with the reversing valve and the oil pump, the controller is used for controlling N starting time sequences and reversing time intervals of the plunger pumps through the reversing valve according to signals of the position sensors, and the controller is used for adjusting the running speed of at least one plunger pump when one or more reversing time intervals of the plunger pumps exceed a preset reversing time interval by a certain deviation.
In the above plunger pump water supply system, preferably, the plunger pump includes at least one standard plunger pump, and the controller is configured to control a start timing sequence and a reversing time interval of other plunger pumps except the standard plunger pump with respect to the standard plunger pump, and adjust an operation speed of the standard plunger pump and/or adjust an operation speed of the plunger pump whose reversing time interval exceeds a preset reversing time interval by a certain deviation when the reversing time interval of one or more of the plunger pumps with respect to the standard plunger pump exceeds the preset reversing time interval by a certain deviation.
In the plunger pump water supply system, the controller is preferably further configured to control the starting sequence of the N plunger pumps through the reversing valve according to the signal of the position sensor; and/or the controller is also used for controlling the moving speed of the piston rods of the N plunger pumps according to the signals of the position sensors, so as to control the running speed of the plunger pumps; and/or the controller is also used for controlling each plunger pump to change direction according to the signal of the position sensor and the preset change-over time interval; and/or the controller is used for judging whether each plunger pump and the driving oil circuit thereof have faults or not according to the signals of the position sensors and adjusting the starting time sequence and the reversing time interval of the plurality of plunger pumps.
In the plunger pump water supply system, preferably, the number of the oil pumps is N, the N oil pumps are driven by a plurality of power devices, the number of the reversing valves is multiple, and an outlet of one oil pump is communicated with a rod cavity and a rodless cavity of an oil cylinder of the plunger pump through at least one reversing valve; a water cylinder rod cavity and/or a water cylinder rodless cavity of the plunger pump are/is communicated with the water tank through a water inlet one-way valve and communicated with a water supply port through a water outlet one-way valve; each power device is at least in driving connection with one oil pump, and the signal output end of the controller is also connected with a plurality of power devices and used for controlling the output power of the power devices according to the number of the oil pumps driven by each power device.
On the other hand, the invention also provides a control method of the plunger pump water supply system, the plunger pump water supply system comprises N plunger pumps, an oil pump for driving the N plunger pumps to supply water, a reversing valve for independently controlling each plunger pump and a controller connected with the reversing valve and the oil pump, N is an integer larger than or equal to 2, each plunger pump comprises an oil cylinder (10-2) and a water cylinder (10-3) which are connected through a piston rod, the controller controls the starting time sequence and the reversing time interval of the N plunger pumps through the reversing valve, and the running speed of at least one plunger pump is adjusted when the reversing time interval of one or more plunger pumps exceeds a preset reversing time interval by a certain deviation.
In the above control method, preferably, at least one of the plunger pumps is selected as a standard plunger pump, the controller controls the starting timing sequence and the reversing time interval of the plunger pumps other than the standard plunger pump relative to the standard plunger pump, and when the reversing time interval of one or more of the plunger pumps relative to the standard plunger pump exceeds a preset reversing time interval by a certain deviation, the operating speed of the standard plunger pump is adjusted, and/or the operating speed of the plunger pump whose reversing time interval exceeds the preset reversing time interval by a certain deviation is adjusted.
In the control method, preferably, when the reversing time interval of one or more plunger pumps relative to the standard plunger pump is greater than a preset reversing time interval by a certain deviation, the controller controls the operation speed of the standard plunger pump to increase by controlling the displacement increase of the oil pump, and/or controls the operation speed of the plunger pump with the reversing time interval exceeding the preset reversing time interval by a certain deviation by controlling the displacement increase of the oil pump; or the like, or, alternatively,
when the reversing time interval of one or more plunger pumps relative to the standard plunger pump is smaller than a preset reversing time interval by a certain deviation, the controller controls the running speed of the standard plunger pump to be reduced by controlling the displacement reduction of the oil pump, and/or the controller controls the running speed of the plunger pump with the reversing time interval exceeding the preset reversing time interval by a certain deviation by controlling the displacement reduction of the oil pump.
In the control method, it is preferable that the controller controls the single-trip operation time T of each plunger pump according to the water supply flow rate of the plunger pump water supply system, and controls the start time interval of the N plunger pumps operating in the start timing to be T/N; and/or; controlling the preset reversing time interval of the N plunger pumps to be T/N; or the like, or, alternatively,
and the controller controls the one-way operation time T of the standard plunger pump according to the water supply flow of the plunger pump water supply system, controls the starting time intervals of other plunger pumps except the standard plunger pump to act according to the starting time sequence to be T/N, and controls the preset reversing time intervals of other plunger pumps except the standard plunger pump to be T/N.
In the control method, preferably, the moving position of the piston rod of each plunger pump is acquired, and the controller controls the starting sequence of a plurality of plunger pumps through the reversing valve; and/or the controller controls the movement speed of the piston rod of each plunger pump according to the movement position of the piston rod, so as to control the running speed of the plunger pumps; and/or the controller controls each plunger pump to change direction according to the preset change-over time interval according to the moving position of the piston rod.
In the control method, preferably, the controller determines whether each plunger pump and the driving oil path thereof have a fault according to the moving position of the piston rod, and adjusts the starting timing sequence and the reversing time interval of the plurality of plunger pumps; or the like, or, alternatively,
detecting the water supply flow of each plunger pump, judging whether each plunger pump and a driving oil circuit thereof have faults or not by the controller according to the water supply flow of each plunger pump, and adjusting the starting time sequence and the reversing time interval of the plurality of plunger pumps; or the like, or, alternatively,
the method comprises the steps of obtaining the displacement of the oil pump, calculating the moving speed of the piston rod according to the moving position of the piston rod, judging whether each plunger pump and a driving oil circuit of the plunger pump are in fault or not by the controller according to the displacement of the oil pump and the moving speed of the piston rod, and adjusting the starting time sequence and the reversing time interval of the plunger pumps.
The invention provides a plunger pump water supply system and a control method thereof, wherein the plunger pump water supply system comprises N plunger pumps, an oil pump for driving the N plunger pumps to supply water, a reversing valve for independently controlling each plunger pump and a controller, N is an integer more than or equal to 2, and each plunger pump comprises an oil cylinder (10-2) and a water cylinder (10-3) which are connected through a piston rod; the device comprises a controller, a reversing valve, a reversing time interval and a position sensor, wherein the controller is used for controlling the starting time sequence and the reversing time interval of the N plunger pumps according to signals of the position sensor, and the controller is used for adjusting the running speed of at least one plunger pump when the reversing time interval of one or more plunger pumps exceeds a preset reversing time interval by a certain deviation. The plunger pump water supply system and the control method thereof adopt closed-loop control, and meanwhile, when the reversing time interval of one or more plunger pumps exceeds a preset reversing time interval by a certain deviation (the deviation can be set according to control precision), the controller is used for adjusting the running speed of at least one plunger pump, so that the plurality of plunger pumps can be ensured to act according to a preset sequence and a preset reversing time interval for a long time, the pumping continuity is good, and the flow pulsation is small. Meanwhile, through the position sensor, the running speed (reflected as the moving speed of the piston rod) of the plunger pump can be monitored and timely adjusted, and the flow of the oil pump can be distributed to each plunger pump according to the requirement in actual work, so that the problem that 2 or more than 2 plunger pumps are reversed simultaneously in the continuous running of the system is solved, and the continuity and flow fluctuation of water supply of the system are greatly improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a water supply system for a plunger pump according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a plunger pump water supply system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a plunger pump water supply system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing the relationship between the moving position of the piston (cylinder piston) of the plunger pump and the moving speed of the piston;
FIG. 5 is a schematic diagram of preset reversing time intervals of oil cylinders of a plurality of plunger pumps;
FIG. 6 is a diagram illustrating the relationship between the displacement of the oil pump and the speed of the oil cylinder;
fig. 7 is a schematic diagram of the cylinder piston start timing sequence and reversing of four plunger pumps.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that, the first, second, third and fourth components mentioned herein are only used for distinguishing different components with the same or similar features, and are not limited to the components themselves, and there is no precedence or dependency between the components; in addition, "and/or" herein includes both "and" or "cases.
On one hand, referring to fig. 1-3, a plunger pump water supply system provided in an embodiment of the present invention includes N plunger pumps 10 for supplying water for fire fighting, rescue, life, etc., an oil pump 20 for driving the N plunger pumps 10 to supply water, a reversing valve 30 for individually controlling each plunger pump 10, and a controller 40, each plunger pump 10 includes an oil cylinder 10-2 and a water cylinder 10-3 connected by a piston rod 10-1, specifically, as shown in fig. 3, an oil cylinder piston is disposed in the oil cylinder 10-2, a water cylinder piston is disposed in the water cylinder 10-3, two ends of the piston rod 10-1 are respectively connected to the oil cylinder piston and the water cylinder piston, when hydraulic oil enters the oil cylinder 10-2, the oil cylinder piston is driven to move, thereby driving the piston rod 10-1 to move, thereby driving the water cylinder piston to move, and the water cylinder piston to complete water supply operation, reference may be made in particular to the prior art; meanwhile, as shown in fig. 1 and 2, the plunger pump water supply system of the present invention further includes a position sensor 50, where the position sensor 50 is configured to obtain a moving position of the piston rod 10-1 of each plunger pump 10, and since the piston rod 10-1 of the plunger pump 10 is connected to the cylinder piston and the water cylinder piston, the position sensor 50 may also obtain the moving position of the piston rod 10-1 by first obtaining the moving position of the cylinder piston and/or the water cylinder piston, where the foregoing moving position may be specifically understood as a position of the piston rod relative to the cylinder and/or the water cylinder (in operation, positions of the cylinder 10-2 and the water cylinder 10-3 are relatively fixed). And the signal output end of the position sensor 50 is connected with the controller 40, the signal output end of the controller 40 is connected with the reversing valve 30 and the oil pump 20, and the controller 40 is used for controlling the starting timing sequence and the reversing time interval of the N plunger pumps 10 through the reversing valve 30 according to the signal of the position sensor 50 and adjusting the running speed of at least one plunger pump 10 when the reversing time interval of one or more plunger pumps 10 exceeds a preset reversing time interval by a certain deviation.
In this scheme, the start sequence may be understood as a start sequence and a start time interval of each plunger pump 10, the reversing time interval may be understood as a time difference of reversing of each plunger pump 10, at this time, the reversing time intervals of each plunger pump 10 may be the same (the reversing time of each plunger pump 10 forms an arithmetic progression), or may be different, and during specific control, one standard plunger pump 100 (refer to fig. 5) may be disposed in the N plunger pumps 10, and the reversing time interval may also be understood as a reversing time interval of another plunger pump 10 other than the standard plunger pump 100 and the standard plunger pump 100. The preset reversing time interval is a reversing time interval of each plunger pump 10 preset according to a reversing strategy, and because the plunger pump needs to realize water supply operation through reciprocating motion of a piston, reversing is necessary for the plunger pump, as shown in fig. 4, taking a piston of an oil cylinder as an example (or a water cylinder piston), when the piston moves from the leftmost end to the right end, reversing is needed at a reversing point, and when the piston moves from the rightmost end to the leftmost end, reversing is also needed, correspondingly, the reversing time interval may be an interval of reversing time points of the piston at two ends of the oil cylinder, or an interval of reversing time points at one end of the oil cylinder, and considering a difference of reciprocating stroke acting forces of the piston, the interval of the reversing time points at one end of the oil cylinder, that is, the interval of reversing time when the piston once reciprocates, is preferable.
In addition, in the present embodiment, the operation speed of the plunger pump 10 refers to the moving speed of the cylinder piston and the water cylinder piston of the plunger pump 10, which directly affects the water supply flow rate of the plunger pump 10, and since the piston rod 10-1 of the plunger pump 10 is connected to the cylinder piston and the water cylinder piston, it can also be understood as the moving speed of the piston rod 10-1, such as the average moving speed of each stroke, or the moving speed of the piston rod 10-1 relative to each position of the cylinder or the water cylinder, the former is easy to control, and the latter is high in control accuracy, which can be specifically determined according to the requirement. Meanwhile, in order to further reduce the pulsation of the supplied water, the reciprocating stroke of the piston rod can be further considered in the moving speed, as shown in fig. 3, when the piston rod 10-1 moves upwards, the water supply amount of the piston rod 10-1 per unit moving length is large due to the rodless cavity of the water cylinder, and the average moving speed of the piston rod 10-1 can be controlled to be slow; on the contrary, when the piston rod 10-1 moves downwards, the rod cavity of the water cylinder supplies water, and the average moving speed of the piston rod 10-1 is high. Through this scheme, be favorable to plunger pump 10 to supply water mouthful pressure and flow in positive and negative stroke equal to need not to design plunger pump 10's volume very big, thereby be convenient for plunger pump 10's installation and arrange and maintenance.
It should be noted that the position sensor 50 may be any sensor capable of acquiring the position of the piston rod 10-1, such as a proximity switch, a linear displacement sensor, a pull-cord type displacement sensor, and the like.
In the scheme, the plunger pump water supply system adopts closed-loop control, and meanwhile, when the reversing time interval of one or more plunger pumps 10 exceeds a preset reversing time interval certain deviation (the deviation can be set according to control precision, such as 50% and 30% of the preset reversing time interval), the controller 40 is used for adjusting the running speed of at least one plunger pump 10, so that the plurality of plunger pumps 30 can be ensured to act according to a preset sequence and a preset reversing time interval for a long time, the pumping continuity is good, and the flow pulsation is small. Meanwhile, through the position sensor 50, the running speed of the plunger pump 30 (reflected as the moving speed of the piston rod 10-1) can be monitored and timely adjusted, and in actual work, the flow of the oil pump can be distributed to each plunger pump 10 according to needs, so that the problem that 2 or more than 2 plunger pumps 10 are reversed simultaneously in the continuous running of the system is solved, and the continuity and flow fluctuation of water supply of the system are greatly improved.
In the above scheme, the start timing and the reversing time interval of each plunger pump 10 may be preset, and each plunger pump 10 starts and reverses according to a predetermined rule, as shown in fig. 5, preferably, the plunger pump 10 includes at least one standard plunger pump 100, and the controller 40 is configured to control the start timing and the reversing time interval of other plunger pumps 10 (following plunger pumps) than the standard plunger pump 100 with respect to the standard plunger pump 100, and adjust the operation speed of the standard plunger pump 100 when the reversing time interval of one or more plunger pumps 10 with respect to the standard plunger pump 100 exceeds a predetermined reversing time interval by a certain deviation (i.e., exceeds an allowable deviation), and/or adjust the operation speed of the plunger pump 10 when the reversing time interval exceeds the predetermined reversing time interval by a certain deviation.
In the specific adjustment, whether the standard plunger pump 100 or the plunger pump 10 with the deviation is adjusted, the reason of the deviation can be considered, if the running speed of the standard plunger pump 100 does not meet the requirement, the standard plunger pump 100 can be adjusted, otherwise, the plunger pump 10 with the deviation is adjusted, and of course, the adjustment can be carried out simultaneously, and the requirement is met as soon as possible. When the reversing time interval of one or more plunger pumps 10 relative to the standard plunger pump 100 is larger than the preset reversing time interval by a certain deviation, the controller 40 controls the running speed of the standard plunger pump 100 to increase by controlling the displacement of the oil pump 20 to increase, and/or the controller 40 controls the running speed of the plunger pump 10 of which the reversing time interval exceeds the preset reversing time interval by a certain deviation by controlling the displacement of the oil pump 20 to increase; when the reversing time interval of one or more plunger pumps 10 relative to the standard plunger pump 100 is smaller than the preset reversing time interval by a certain deviation, the controller 40 controls the running speed of the standard plunger pump 100 to be reduced by controlling the displacement of the oil pump 20 to be reduced, and/or the controller 40 controls the running speed of the plunger pump 10 of which the reversing time interval exceeds the preset reversing time interval by a certain deviation by controlling the displacement of the oil pump 20 to be reduced. By this arrangement, the reversing time of each plunger pump 10 can be controlled within a certain range.
Fig. 6 shows the relationship between the displacement of the oil pump and the speed of the oil cylinder, the greater the displacement of the oil pump, the more pleasant the speed of the oil cylinder, and therefore, the displacement of the oil pump can be controlled according to the relationship between the displacement of the oil pump and the speed of the oil cylinder, so that the effect of controlling the operation speed of the plunger pump can be achieved.
Preferably, the controller 40 is configured to control the start timing of the N plunger pumps 10 through the direction changing valve 30 according to the signal of the position sensor 50; the controller 40 is used for controlling the moving speed of the piston rods 10-1 of the N plunger pumps 10 according to the signals of the position sensor 50, thereby controlling the running speed of the plunger pumps 10; in addition, the controller 40 is also used for controlling each plunger pump 10 to change direction according to the signal of the position sensor 50 according to the preset change-over time interval; and/or, the controller 40 is used for determining whether each plunger pump 10 and the driving oil circuit thereof have faults according to the signals of the position sensor 50, and adjusting the starting sequence and the reversing time interval of a plurality of plunger pumps 10. The determination of the failure may be based on the determination of the movement position of the piston rod 10-1, the calculation of the movement speed of the piston rod 10-1 from the movement position of the piston rod 10-1 (the movement speed v is the movement distance ds per unit time/dt per unit time), the determination of the movement speed of the piston rod 10-1 and the displacement of the oil pump 20, the determination of the water supply flow rate per plunger pump 10 (specifically, an oil amount sensor may be provided at the water outlet of the water cylinder 10-3 of the plunger pump 10), or the like. Specifically, when the position information detected by the position sensor 50 has a certain deviation from the position information of the standard or preset piston rod 10 (for example, the piston rod 10-1 does not move for a long time, the movement speed of the piston rod 10-1 is significantly slowed down, etc.), when the water supply flow rate value is significantly lower than the preset value or the standard value, it can be determined that the plunger pump 10 and the driving oil circuit thereof may have a fault, at this time, the start timing and the reversing time interval of other plunger pumps 10 without a fault can be adjusted, the control method is similar to the above, of course, a standard plunger pump can be selected again, and the control can be performed according to the above control method, so as to ensure the continuity and the flow rate of water supply, and of course, an alarm signal can be sent to remind the operator.
In the above solution, the position sensor 50 may be disposed in various manners and positions, for example, the position sensor 50 is disposed on the oil cylinder 10-2 or the water cylinder 10-3 for measuring the moving position of the oil cylinder piston or the water cylinder piston, and may also be disposed between the oil cylinder and the water cylinder for directly measuring the moving position of the piston rod 10-1. Specifically, as shown in fig. 3, the position sensor includes a measuring rod extending into a rodless cavity of the oil cylinder 10-2, an axial hole is formed in the piston of the oil cylinder 10-2 and the piston rod 10-1, the measuring rod further extends into the axial hole, and the moving position of the piston rod 10-1 can be obtained through the measuring rod. In this way, any position signal of the piston rod 10-1 can be obtained.
In the plunger pump water supply system, the number of the oil pumps 20 may be one or more, preferably, the number of the oil pumps 20 also includes N, and correspondingly, the number of the reversing valves 30 also includes a plurality, and an outlet of one oil pump 20 is communicated with a rod cavity and a rodless cavity of an oil cylinder of one plunger pump 10 through at least one reversing valve 30 (the reversing valve 30 may be an electrically controlled reversing valve, or an electrically controlled reversing valve + a hydraulically controlled reversing valve, or an electrically controlled reversing valve + a plurality of cartridge valves, etc.); the rod and/or rodless chambers of the cylinder of one plunger pump 10 are in communication with the water tank 70 through the inlet check valve 61 and with the water supply port 80 through the outlet check valve 62. The water inlet check valve 61 and the water outlet check valve 62 are both check valves, but the connection mode between the check valves and the water tank is different, specifically, the outlet of the water inlet check valve 61 is connected with the water tank 10-3, and the inlet of the water outlet check valve 62 is connected with the water tank 10-3, which can be referred to fig. 2 specifically. Meanwhile, as one plunger pump 10 is supplied with oil by one oil pump 20 and is controlled by at least one reversing valve 30, the driving oil path of each plunger pump 10 is independent, when one plunger pump 10 and the driving oil path of the plunger pump 10 are in failure, other plunger pumps 10 are not affected, the controller 40 can control other plunger pumps 10 to continue to work after the action time sequence is changed, the influence on the continuity of water supply is small, and the system has strong capability of coping with the failure.
The plunger pump water supply system preferably further comprises a plurality of power devices 90 for driving the N oil pumps 20, each power device 90 is in driving connection with at least one oil pump 20, and the signal output end of the controller 40 is further connected with the plurality of power devices 90 for controlling the output power of the power devices 90 according to the number of the oil pumps 20 driven by each power device 90. The power device can be a fuel engine, a motor and the like, when a certain oil pump 20 driven by a certain power device 90 breaks down, the total power requirement of other oil pumps 20 driven by the power device 90 is reduced, if the output power of the power device 90 is unchanged, energy waste is easily caused, and parts such as the oil pump and a plunger pump are easily damaged.
In order to facilitate the control of the moving speed of the piston rod 10-1 of the plunger pump 10 (directly reflecting the fire fighting water supply speed), the above-mentioned plunger pump water supply system, preferably, the reversing valve 30 is an electromagnetic proportional reversing valve, and the controller 40 is configured to control the moving speed of the piston rod 10-1 of each plunger pump 10 through the electromagnetic proportional reversing valve according to the signal of the position sensor 50; or, the oil pump 20 is a variable displacement pump, the signal output terminal of the controller 40 is further connected to the control terminal of the variable displacement pump, and the controller 40 is configured to control the moving speed of the piston rod 10-1 of each plunger pump 10 through the variable displacement pump according to the signal of the position sensor 50. The moving speed is adjusted through the electromagnetic proportional reversing valve or the variable pump, the control is convenient, and the electromagnetic proportional reversing valve and the variable pump can be adjusted at the same time.
In the above plunger pump water supply system, preferably, as shown in fig. 2, the plurality of plunger pumps 10 includes a first plunger pump 11 and a second plunger pump 12, the oil pump 20 includes a first oil pump 21 and a second oil pump 22, the direction change valve 30 includes a first direction change valve 31 and a second direction change valve 32, the position sensor 50 includes a first position sensor 51 and a second position sensor 52, an outlet of the first oil pump 21 communicates with the cylinder rod chamber and the cylinder rodless chamber of the first plunger pump 11 through the first direction change valve 31, an outlet of the second oil pump 22 communicates with the cylinder rod chamber and the cylinder rodless chamber of the second plunger pump 12 through the second direction change valve 32, the cylinder rod chamber and the cylinder rodless chamber of the first plunger pump 11 and the second plunger pump 12 communicate with the water tank 70 through the water inlet check valve 61, respectively, the cylinder rod chamber and the cylinder rodless chamber of the first plunger pump 11 and the second plunger pump 12 further communicate with the water supply port 80 through the water outlet check valve 62, the signal output end of the controller 40 is connected with the first direction valve 31 and the second direction valve 32, the first position sensor 51 is used for acquiring the moving position of the piston rod 10-1 of the first plunger pump 11, the second position sensor 52 is used for acquiring the moving position of the piston rod 10-1 of the second plunger pump 12, the controller 40 is used for controlling the action timing of the first plunger pump 11 and the second plunger pump 12 through the first direction valve 31 and the second direction valve 32 according to the signals of the first position sensor 51 and the second position sensor 52, and/or the controller 40 is used for controlling the moving speed of the piston rod 10-1 of the first plunger pump 11 and the second plunger pump 12 according to the signals of the first position sensor 51 and the second position sensor 52.
Further, the plurality of plunger pumps 10 further include a third plunger pump 13, a fourth plunger pump 14, the oil pump 20 further includes a third oil pump 23, a fourth oil pump 24, the direction-changing valve 30 further includes a third direction-changing valve 33, a fourth direction-changing valve 34, the position sensor 50 includes a third position sensor 53, a fourth position sensor 54, an outlet of the third oil pump 23 is communicated with the cylinder rod chamber and the cylinder rodless chamber of the third plunger pump 13 through the third direction-changing valve 33, an outlet of the fourth oil pump 24 is communicated with the cylinder rod chamber and the cylinder rodless chamber of the fourth plunger pump 14 through the fourth direction-changing valve 34, a cylinder rod chamber and a cylinder rodless chamber of the third plunger pump 13 and the fourth plunger pump 14 are respectively communicated with the water tank 70 through the water inlet check valve 61, a cylinder rod chamber and a cylinder rodless chamber of the third plunger pump 13 and the fourth plunger pump 14 are respectively communicated with the water outlet port 80 through the water outlet check valve 62, and the signal output end of the water supply valve 33 of the controller 40 is also communicated with the water supply valve 33, The fourth direction changing valve 34 is connected, the third position sensor 53 is used for acquiring the moving position of the piston rod 10-1 of the third plunger pump 13, the fourth position sensor 54 is used for acquiring the moving position of the piston rod 10-1 of the fourth plunger pump 14, the controller 40 is used for controlling the action time sequence of the third plunger pump 13 and the fourth plunger pump 14 through the third direction changing valve 33 and the fourth direction changing valve 34 according to the signals of the third position sensor 53 and the fourth position sensor 54, and/or the controller 40 is used for controlling the moving speed of the piston rod 10-1 of the third plunger pump 13 and the fourth plunger pump 14 according to the signals of the first position sensor 51 and the second position sensor 52.
Furthermore, the first oil pump 21 and the second oil pump 22 are connected with the first power unit 91 in a driving manner, the third oil pump 23 and the fourth oil pump 24 are connected with the second power unit 92 in a driving manner, the reversing valve 30 is a three-position four-way electromagnetic reversing valve 30, and the reversing valve 30 has an M-type middle position function. As shown in fig. 2, in the M-type middle position function reversing valve 30, when the valve is in the middle position, the pressure oil inlet is communicated with the oil return port, and the two working oil ports are blocked, so that each plunger pump 10 is independently controlled.
The plunger pump water supply system can also comprise six oil pumps, six reversing valves, six plunger pumps, eight oil pumps, eight reversing valves, eight plunger pumps, ten oil pumps, ten reversing valves, ten plunger pumps and the like besides the four oil pumps, four reversing valves and four plunger pumps; the power plant may comprise three, four, five, etc. in addition to two, in the arrangement according to fig. 2.
The plunger pump water supply system can be applied to fire fighting equipment such as a high-spraying fire fighting truck and a climbing platform fire fighting truck, and can also be fixedly arranged in a high-rise building to be used as a special fire fighting facility of the building.
On the other hand, the invention also provides a control method of the plunger pump water supply system, the plunger pump water supply system comprises N plunger pumps 10, an oil pump 20 for driving the N plunger pumps 10 to supply water, a reversing valve 30 for individually controlling each plunger pump 10 and a controller 40 connected with the reversing valve 30 and the oil pump 20, N is an integer greater than or equal to 2, each plunger pump 10 comprises an oil cylinder 10-2 and a water cylinder 10-3 which are connected through a piston rod 10-1, and of course, the plunger pump water supply system can also be the plunger pump water supply system. The control method comprises the steps that the controller 40 controls the starting time sequence and the reversing time interval of the N plunger pumps 10 through the reversing valve 30, and when the reversing time interval of one or more plunger pumps 10 exceeds a preset reversing time interval by a certain deviation, the running speed of at least one plunger pump 10 is adjusted.
In this scheme, plunger pump water supply system's adoption closed-loop control, simultaneously, when the switching-over time interval of a certain or more plunger pumps 10 surpassed predetermineeing switching-over time interval certain deviation (the deviation can be set up according to control accuracy), controller 40 adjusted the operating speed of at least one plunger pump 10 to, can guarantee that a plurality of plunger pumps 30 move according to predetermined order, predetermineeing switching-over time interval for a long time, the pumping continuity is good, and flow pulsation is little. Meanwhile, through the position sensor 50, the running speed of the plunger pump 30 (reflected as the moving speed of the piston rod 10-1) can be monitored and timely adjusted, and in actual work, the flow of the oil pump can be distributed to each plunger pump 10 according to needs, so that the problem that 2 or more than 2 plunger pumps 10 are reversed simultaneously in the continuous running of the system is solved, and the continuity and flow fluctuation of water supply of the system are greatly improved.
In the above control method, referring to fig. 5, preferably, at least one plunger pump 10 is selected as a standard plunger pump 100, the start timing and the reversing time interval of other plunger pumps 10 except the standard plunger pump 100 relative to the standard plunger pump 100 are controlled by the controller 40, and when the reversing time interval of one or more plunger pumps 10 relative to the standard plunger pump 100 exceeds a preset reversing time interval by a certain deviation, the operation speed of the standard plunger pump 100 is adjusted, and/or the operation speed of the plunger pump 10 whose reversing time interval exceeds the preset reversing time interval by a certain deviation is adjusted. Specifically, when the reversing time interval of one or more plunger pumps 10 relative to the standard plunger pump 100 is greater than the preset reversing time interval by a certain deviation, the controller 40 controls the operation speed of the standard plunger pump 100 to increase by controlling the displacement of the oil pump 20 to increase, and/or the controller 40 controls the operation speed of the plunger pump 10 of which the reversing time interval exceeds the preset reversing time interval by a certain deviation by controlling the displacement of the oil pump 20 to increase; or, when the reversing time interval of one or more plunger pumps 10 relative to the standard plunger pump 100 is smaller than the preset reversing time interval by a certain deviation, the controller 40 controls the running speed of the standard plunger pump 100 to be reduced by controlling the displacement of the oil pump 20 to be reduced, and/or the controller 40 controls the running speed of the plunger pump 10, of which the reversing time interval exceeds the preset reversing time interval by a certain deviation, to be reduced by controlling the displacement of the oil pump 20 to be reduced. By this arrangement, the reversing time of each plunger pump 10 can be controlled within a certain range.
In the control method described above, the controller 40 preferably controls the single-trip operation time T of each plunger pump 10 according to the water supply flow rate of the plunger pump water supply system, and controls the start time interval of the N plunger pumps 10 to be T/N in accordance with the start timing; and/or; controlling the preset reversing time interval of the N plunger pumps 10 to be T/N; or the controller 40 controls the one-way operation time T of the standard plunger pump 100 according to the water supply flow rate of the plunger pump water supply system, the controller 40 controls the starting time interval of the plunger pumps 10 except the standard plunger pump 100 to be T/N according to the starting sequence, and controls the preset reversing time interval of the plunger pumps 10 except the standard plunger pump 100 to be T/N. Referring to fig. 4, taking the cylinder as an example, the one-way operation time T may be a time required for the piston of the cylinder to move from the leftmost end to the right end, or a time required for the piston to move from the rightmost end to the leftmost end, or may be a time required for the piston of the cylinder to move to the right end after reversing from the right end to the left end. In this way, it is advantageous to avoid repetition of the reversing time of each plunger pump 10 due to operational deviation during operation of the plunger pump 10.
As shown in fig. 7, taking 4 plunger pumps as an example (i.e., N is 4), each plunger pump has 1 cylinder, at time T0, the piston of cylinder i starts to start, assuming that the one-way operation time of the piston of cylinder i from the left end to the right end is T according to the required flow requirement, the start time interval is set to T/4, at time T1 (T0+ T/4), the piston of cylinder i continues to move, the piston of cylinder ii starts to start, at time T2 (T0+ T/2), the pistons of cylinders i and ii continue to move, the piston of cylinder iii starts to start, at time T3 (T0+3T/4), the piston of cylinder i, cylinder ii and cylinder iii continues to move, the piston of cylinder vi continues to move, at time T4 (T0+ T), the piston of cylinder ii, cylinder iii and cylinder vi continues to move, and the piston of cylinder i starts to change direction, at the time of T5 (T0+5T/4), the pistons of the oil cylinder I, the oil cylinder III and the oil cylinder VI continue to move, the piston of the oil cylinder II starts to change direction, and the change-over time interval is also T/4.
In the control method, preferably, the moving position of the piston rod 10-1 of each plunger pump 10 can be acquired, and the controller 40 controls the starting sequence of the plurality of plunger pumps 10 through the reversing valve 30; and/or the controller 40 controls the moving speed of the piston rod 10-1 of each plunger pump 10 according to the moving position of the piston rod 10-1, thereby controlling the running speed of the plunger pump 10; and/or the controller 40 controls each plunger pump 10 to be reversed at preset reversing time intervals according to the moving position of the piston rod 10-1.
In the above control method, in order to automatically diagnose whether the N plunger pumps 10 and the driving oil paths thereof have faults so as to perform adjustment in time and avoid large flow fluctuation, preferably, the controller 40 determines whether each plunger pump 10 and the driving oil paths thereof have faults according to the moving position of the piston rod 10-1, and adjusts the starting timing sequence and the reversing time interval of the plurality of plunger pumps 10; or, the water supply flow of each plunger pump 10 is detected, the controller 40 determines whether each plunger pump 10 and the driving oil circuit thereof have a fault according to the water supply flow of each plunger pump 10, and adjusts the start timing sequence and the reversing time interval of the plurality of plunger pumps 10; or, the displacement of the oil pump 20 is acquired, the moving speed of the piston rod 10-1 is calculated according to the moving position of the piston rod 10-1, and the controller 40 determines whether each plunger pump 10 and the driving oil circuit thereof have faults or not according to the displacement of the oil pump 20 and the moving speed of the piston rod 10-1, and adjusts the starting time sequence and the reversing time interval of the plurality of plunger pumps 10.
Specifically, when the moving position of the piston rod 10-1 has a certain deviation from the standard or preset moving position information of the piston rod 10 (for example, the piston rod 10-1 does not move for a long time, the moving speed of the piston rod 10-1 is significantly slowed, etc.), or when the water supply flow rate value is significantly lower than the preset value or the standard value, or the displacement of the oil pump 20 is significantly not corresponding to the moving speed of the piston rod 10-1, it can be determined that the plunger pump 10 and the driving oil path thereof have a fault, such as an oil pump fault, a pipeline oil leakage, a reversing valve fault, a plunger pump 10 fault, etc., at this time, the plunger pump 10 can be adjusted, for example, the flow rate required by each other plunger pump 10 (the plunger pump 10 has no fault and the driving oil path thereof has no fault) can be calculated again according to the water supply requirement, the start timing, of course, a standard plunger pump can be reselected and controlled according to the control method, so that the continuity and the flow of water supply are ensured, and an alarm signal can be sent out to remind an operator to process in time.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A plunger pump water supply system comprises N plunger pumps (10), an oil pump (20) for driving the N plunger pumps (10) to supply water, a reversing valve (30) for individually controlling each plunger pump (10) and a controller (40), wherein N is an integer greater than or equal to 2, and each plunger pump (10) comprises an oil cylinder (10-2) and a water cylinder (10-3) which are connected through a piston rod (10-1); the device is characterized by further comprising a position sensor (50), wherein the position sensor (50) is used for acquiring the moving position of a piston rod (10-1) of each plunger pump (10), the signal output end of the position sensor (50) is connected with the controller (40), the signal output end of the controller (40) is connected with the reversing valve (30) and the oil pump (20), the controller (40) is used for controlling the starting sequence and the reversing time interval of N plunger pumps (10) through the reversing valve (30) according to the signal of the position sensor (50), calculating the moving speed of the piston rod (10-1) according to the signal of the position sensor (50), and controlling the moving speed of the piston rods (10-1) of N plunger pumps (10) when the reversing time interval of one or more plunger pumps (10) exceeds a preset reversing time interval by a certain deviation, thereby adjusting the operating speed of at least one of the plunger pumps (10).
2. Plunger pump water supply system according to claim 1, characterised in that the plunger pumps (10) comprise at least one standard plunger pump (100), and that the controller (40) is adapted to control the start-up timing and the reversing time interval of other plunger pumps (10) than the standard plunger pump (100) in relation to the standard plunger pump (100) and to adjust the operating speed of the standard plunger pump (100) and/or of the plunger pumps (10) with a reversing time interval exceeding the deviation of a preset reversing time interval when the reversing time interval of one or more of the plunger pumps (10) in relation to the standard plunger pump (100) exceeds the deviation of a preset reversing time interval.
3. Plunger pump water supply system according to claim 1 or 2, characterized in that the controller (40) is further adapted to control the activation sequence of the N plunger pumps (10) by means of the reversing valve (30) depending on the signal of the position sensor (50); and/or the controller (40) is also used for controlling each plunger pump (10) to switch according to the signal of the position sensor (50) according to the preset switching time interval; and/or the controller (40) is used for judging whether each plunger pump (10) and a driving oil circuit thereof have faults or not according to signals of the position sensor (50) and adjusting the starting sequence and the reversing time interval of a plurality of plunger pumps (10).
4. Plunger pump water supply system according to claim 1 or 2, characterized in that the oil pump (20) comprises N, N of the oil pumps (20) are driven by a plurality of power means (90), the reversing valve (30) comprises a plurality, the outlet of one of the oil pumps (20) is in communication with the cylinder rod chamber and the cylinder rodless chamber of one of the plunger pumps (10) through at least one reversing valve (30); a water cylinder rod cavity and/or a water cylinder rodless cavity of the plunger pump (10) are/is communicated with the water tank (70) through the water inlet one-way valve (61) and communicated with the water supply port (80) through the water outlet one-way valve (62); each power device (90) is at least in driving connection with one oil pump (20), and the signal output end of the controller (40) is also connected with a plurality of power devices (90) and used for controlling the output power of the power devices (90) according to the number of the oil pumps (20) driven by each power device (90).
5. A control method of a plunger pump water supply system, the plunger pump water supply system comprises N plunger pumps (10), an oil pump (20) for driving the N plunger pumps (10) to supply water, a reversing valve (30) for individually controlling each plunger pump (10) and a controller (40) connected with the reversing valve (30) and the oil pump (20), N is an integer greater than or equal to 2, each plunger pump (10) comprises an oil cylinder (10-2) and a water cylinder (10-3) which are connected through a piston rod (10-1), the method is characterized in that the moving position of the piston rod (10-1) of each plunger pump (10) is obtained, the moving speed of the piston rod (10-1) is calculated according to the moving position, and the controller (40) controls the starting sequence and the reversing time interval of the N plunger pumps (10) through the reversing valve (30), and when the reversing time interval of one or more plunger pumps (10) exceeds a preset reversing time interval by a certain deviation, controlling the moving speed of the piston rods (10-1) of the N plunger pumps (10), thereby adjusting the running speed of at least one plunger pump (10).
6. The control method according to claim 5, characterized in that at least one of the plunger pumps (10) is selected as a standard plunger pump (100), the starting sequence and the reversing time interval of the plunger pumps (10) other than the standard plunger pump (100) relative to the standard plunger pump (100) are controlled by the controller (40), and the operating speed of the standard plunger pump (100) is adjusted when the reversing time interval of one or more of the plunger pumps (10) relative to the standard plunger pump (100) exceeds a preset reversing time interval by a certain deviation, and/or the operating speed of the plunger pump (10) whose reversing time interval exceeds a preset reversing time interval by a certain deviation is adjusted.
7. The control method according to claim 6, characterized in that, when the reversing time interval of one or more of the plunger pumps (10) relative to the standard plunger pump (100) is greater than a preset reversing time interval by a certain deviation, the controller (40) controls the operating speed of the standard plunger pump (100) to increase by controlling the displacement of the oil pump (20) to increase, and/or the controller (40) controls the operating speed of the plunger pump (10) whose reversing time interval exceeds the preset reversing time interval by a certain deviation by controlling the displacement of the oil pump (20) to increase; or the like, or, alternatively,
when the reversing time interval of one or more plunger pumps (10) relative to the standard plunger pump (100) is smaller than a preset reversing time interval by a certain deviation, the controller (40) controls the running speed of the standard plunger pump (100) to be reduced by controlling the displacement reduction of the oil pump (20), and/or the controller (40) controls the running speed of the plunger pump (10) with the reversing time interval exceeding the preset reversing time interval by a certain deviation by controlling the displacement reduction of the oil pump (20).
8. The control method according to claim 6, wherein the controller (40) controls a one-way operation time T of each plunger pump (10) in accordance with a water supply flow rate of the plunger pump water supply system, and controls a start time interval of the N plunger pumps (10) to be T/N in a start timing; and/or; controlling the preset reversing time interval of the N plunger pumps (10) to be T/N; or the like, or, alternatively,
the controller (40) controls the one-way operation time T of the standard plunger pump (100) according to the water supply flow of the plunger pump water supply system, the controller (40) controls the starting time interval of the other plunger pumps (10) except the standard plunger pump (100) to act according to the starting sequence to be T/N, and controls the preset reversing time interval of the other plunger pumps (10) except the standard plunger pump (100) to be T/N.
9. The control method according to any one of claims 5 to 8, characterized in that a movement position of a piston rod (10-1) of each of the plunger pumps (10) is acquired, and the controller (40) controls a start timing of a plurality of the plunger pumps (10) through the direction change valve (30); and/or the controller (40) controls each plunger pump (10) to change direction according to the preset change-over time interval according to the moving position of the piston rod (10-1).
10. The control method according to claim 9, wherein the controller (40) determines whether each of the plunger pumps (10) and its drive oil circuit are malfunctioning according to the moving position of the piston rod (10-1), and adjusts the start timing and the reversal time interval of the plurality of plunger pumps (10); or the like, or, alternatively,
detecting the water supply flow of each plunger pump (10), and the controller (40) judges whether each plunger pump (10) and a driving oil circuit thereof have faults or not according to the water supply flow of each plunger pump (10) and adjusts the starting time sequence and the reversing time interval of the plurality of plunger pumps (10); or the like, or, alternatively,
the method comprises the steps of obtaining the displacement of the oil pump (20), calculating the moving speed of the piston rod (10-1) according to the moving position of the piston rod (10-1), judging whether each plunger pump (10) and a driving oil circuit thereof have faults or not by the controller (40) according to the displacement of the oil pump (20) and the moving speed of the piston rod (10-1), and adjusting the starting time sequence and the reversing time interval of the plunger pumps (10).
CN201710451432.8A 2017-06-15 2017-06-15 Plunger pump water supply system and control method thereof Active CN107387360B (en)

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CN100523524C (en) * 2006-05-30 2009-08-05 中国国际海运集装箱(集团)股份有限公司 Liquid controlled reversing buffering mechanism and method
RU2399793C1 (en) * 2009-02-02 2010-09-20 Общество с ограниченной ответственностью "ГАРАНТ-Экологические Технологии Энергоснабжения" ООО "ГАРАНТ-ЭТЭ" Facility for pumping burning gases under high pressure
CN102562510B (en) * 2011-11-07 2015-04-01 三一重工股份有限公司 Pumping system and control method thereof and firefighting equipment with same
CN102536725B (en) * 2011-11-07 2014-05-21 北京市三一重机有限公司 Pumping system, control method thereof, and fire fighting equipment
CN102937074B (en) * 2012-11-12 2015-06-10 三一汽车制造有限公司 Continuous material feeding system and control method and elevating platform fire truck thereof
CN203702476U (en) * 2014-01-06 2014-07-09 西安昆仑液压传动机械厂 Water injection pump
CN104832412A (en) * 2014-12-19 2015-08-12 北汽福田汽车股份有限公司 Pumping displacement control method, apparatus and system

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