CN110454470B - Central hydraulic source shared based on multiple hydraulic terminal equipment networking and hydraulic configuration method thereof - Google Patents
Central hydraulic source shared based on multiple hydraulic terminal equipment networking and hydraulic configuration method thereof Download PDFInfo
- Publication number
- CN110454470B CN110454470B CN201910767021.9A CN201910767021A CN110454470B CN 110454470 B CN110454470 B CN 110454470B CN 201910767021 A CN201910767021 A CN 201910767021A CN 110454470 B CN110454470 B CN 110454470B
- Authority
- CN
- China
- Prior art keywords
- terminal equipment
- pump station
- flow
- hydraulic
- centralized
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/62—Cooling or heating means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
A central hydraulic source shared by a plurality of hydraulic terminal equipment networks and a hydraulic configuration method thereof comprise a centralized pump station and a plurality of terminal equipment branches connected in parallel at the output end of the centralized pump station, wherein the output end of each oil supply pump group of the centralized pump station is provided with a flow sensor, each terminal equipment branch comprises a normally closed first electromagnetic valve, a speed regulating valve, a pressure reducing valve, a second electromagnetic valve and terminal equipment which are sequentially connected, the first electromagnetic valve of each terminal equipment branch is connected in parallel at the output end of the centralized pump station, oil return pipelines of each terminal equipment are converged and then directly connected with an oil return port of an oil tank, the total flow of the output end of the centralized pump station is greater than the sum of the rated flows of each terminal equipment, and the pressure of the output end of the centralized pump station is; the control ends of the first electromagnetic valve and the second electromagnetic valve of each terminal equipment branch and the flow sensor are respectively connected with the input end of a pump station PLC, and the output end of the pump station PLC is connected with the variable frequency motor of each oil supply pump group through a frequency converter.
Description
Technical Field
The invention relates to a hydraulic pump station of a hydraulic system, in particular to a central hydraulic source shared by a plurality of hydraulic terminal equipment networks and a hydraulic configuration method thereof.
Background
However, all hydraulic systems need to be equipped with a pump station, and the pump station is used as a power source for providing rated pressure and flow for hydraulic equipment. The hydraulic pump station is generally composed of a hydraulic pump, an oil tank, hydraulic accessories (overflow valves, filters, accumulators, ball valves, etc.), a cooling system, etc.
According to the configuration mode, the hydraulic pump station can be divided into a special pump station and a centralized pump station. The special pump station is a one-to-one configuration mode of one pump station and one hydraulic device, is suitable for the condition of independent work of the hydraulic device, and is most commonly used. Its advantages are no interference of pressure and flow between terminals and stable performance.
The centralized pump station is a configuration mode that one pump station provides oil sources for a plurality of hydraulic terminal devices, is suitable for the condition of networking work of the hydraulic devices, and is applied more under the condition of centralized networking of a plurality of hydraulic devices. Its advantages are high utilization rate of pump station, less investment, less possessed ground and low energy consumption.
The traditional centralized pump station consists of an oil pump set, a control element, a cooling device and the like. As shown in fig. 1, the centralized pump station adopts two oil supply pump groups 3.1-3.2 (the actual number of the oil supply pump groups is combined according to the requirement and is not specific) as power elements, and two paths of pressure oil output by the oil supply pump groups 3.1-3.2 are combined into one path after passing through high-pressure filters 4.1-4.2 and check valves 6.1-6.2; the combined pressure oil is divided into two paths after passing through a high-pressure filter 4.3, and the two paths of pressure oil respectively enter two terminal devices 11.1-11.2 (the number of actual terminals is not specific according to the requirement), so that respective functions are completed. The two oil return paths of the terminal equipment 11.1-11.2 are combined into one path, and the one path returns to the oil tank 1 after passing through the one-way valve, the low-pressure filter 2.3 and the cooler 14. The operation is circulated in such a way. In this system, the accumulator 7 absorbs pressure pulsations of the hydraulic system. The rated pressure of the primary overflow valves 5.1-5.2 is used for setting two oil supply pump sets 3.1-3.2 respectively to be equal, and the secondary overflow valve 5.3 plays a role in safety protection.
Therefore, the traditional centralized pump station has the following disadvantages:
1. the phenomena of coupling and interference among hydraulic systems of the terminal equipment cannot be avoided
According to the prior art, although a plurality of terminal devices 11.1-11.2 are connected to the outside of the centralized pump station, the centralized pump station cannot support the simultaneous operation of the plurality of terminal devices. When the terminal equipment 11.1 is working and the terminal equipment 11.2 is started/stopped, the pressure and flow fluctuation generated instantly is large, the coupling and interference phenomena between the hydraulic systems of the terminal equipment are inevitable, and the whole pump station system cannot work stably. If the terminal equipment applies dynamic/static load, the load fluctuation is large, and the precision is poor.
2. Flow matching can not be carried out in a self-adaptive starting/stopping control mode of a pump station
Traditional centralized pump station adopts artifical matching flow mode, promptly: before the use, an operator judges the demand number of the oil pump sets in advance according to the flow demand, and correspondingly starts/stops the quantity of the oil pump motor sets of the centralized pump station to increase/decrease the flow, so that the total flow provided by the centralized pump station is adaptive to the flow demand of the terminal equipment. The control mode can not carry out the flow matching of the centralized pump station in a self-adaptive mode.
3. The installation mode of the filter and the cooler causes great oil return resistance
The traditional centralized pump station is provided with a low-pressure filter 2.3 on an oil return pipeline, so that the oil return resistance is large; the cooler 14 is also typically mounted on the return line, which further increases the return resistance. The hydraulic system has the disadvantages that the effective work doing efficiency of the hydraulic system is reduced, and the oil return resistance is easy to exceed the standard.
It is known that, at present, no domestic centralized pump station has the function of 'one pump station is started, and a plurality of devices are connected in parallel and shared' no matter in theory or practice. The hydraulic industry has no generally agreed solution to the composition and principle of the central hydraulic source.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a central hydraulic source which is based on a built hydraulic network and is suitable for being connected in parallel and shared by a plurality of hydraulic terminal devices.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a central hydraulic pressure source based on many hydraulic terminal equipment network deployment sharing, includes the parallelly connected concentrated pump station of constituteing of a N fuel feeding pump package, parallelly connected at the M terminal equipment branch road of concentrated pump station output, N, M is for being greater than 1 natural number, the fuel feeding pump package is inverter motor driven constant delivery pump, the output of each fuel feeding pump package of concentrated pump station all sets up flow sensor, and each terminal equipment branch road is respectively including the first solenoid valve, governing valve, relief pressure valve, the second solenoid valve that connect graduallyTwo solenoid valves and terminal equipment, first, two solenoid valves all are the normally closed valve, and the first solenoid valve of each terminal equipment branch road is parallelly connected concentrate the output of pump station, each terminal equipment's oil return pipeline is direct to be connected with the oil return opening of oil tank, concentrate the output total flow of pump station to be Q0Rated flow rate of each terminal equipment is Q1、Q2…Qm，Q0＞Q1+Q2…+QmThe rated pressure of the oil supply pump group is P0Rated pressure of each terminal equipment is P2、P3…Pm+1，P0＞P2、P3…Pm+1(ii) a The control ends of the first electromagnetic valve and the second electromagnetic valve of each terminal equipment branch and each flow sensor are respectively connected with the input end of a pump station PLC, and the output end of the pump station PLC is connected with the variable frequency motor of each oil supply pump group through a frequency converter.
Compared with the prior art, the invention has at least the following three differences:
1. the selection and matching modes of the flow are different
Before entering each terminal device, the pressure oil at the output end of the centralized pump station passes through a normally closed first electromagnetic valve, when the first electromagnetic valve is started/stopped, a start/stop signal of the first electromagnetic valve is sent to a pump station PLC, the flow configuration of each oil supply pump group of the centralized pump station is automatically adjusted by the pump station PLC according to the rated flow of the pre-accessed terminal device, the outlet flow of the output end of the oil supply pump group is monitored in real time by a flow sensor at the output end of each oil supply pump group, and is transmitted to the pump station PLC for accumulation, the total flow of the output end of the centralized pump station is calculated, the pump station PLC compares the total flow of the output end of the centralized pump station with the total required flow, and further automatically adjusts the rotating speed of a variable frequency motor of the oil supply pump group (the number of the oil supply pump groups is increased/decreased when necessary) through. Therefore, the invention automatically configures the output end flow of the centralized pump station according to the total demand of the terminal equipment, so that the flow demand of each terminal equipment is consistent with the oil supply flow of the centralized pump station, and the closed-loop control is automatically realized.
2. The hydraulic systems of the terminal devices are mutually shielded, and the phenomena of coupling and interference are avoided.
In the prior art, although a plurality of terminal devices connected to the outside of the centralized pump station work simultaneously, such as multipoint coordinated loading in static force and fatigue tests, in the prior art, the plurality of terminal devices are all in a servo valve loading mode, and the mode has high requirements on hydraulic element configuration and oil pollution degree of the terminal devices and has no universality.
In the prior art, there is also an implementation mode that a centralized pump station is connected with terminal equipment through a switch type control valve or a digital control valve, but the connection mode does not support simultaneous work of a plurality of terminal equipment, especially when the first terminal equipment is working and the second terminal equipment is started/stopped simultaneously, pressure and flow fluctuation generated instantly is large, coupling and interference phenomena among hydraulic systems of the terminal equipment cannot be avoided, and the whole pump station system cannot work stably.
The front end of the branch of the terminal equipment is provided with a first electromagnetic valve, and then a speed regulating valve is arranged for regulating flow and pressure. The speed regulating valve is selected instead of the throttle valve, and the speed regulating valve has the advantages that the speed regulating valve can regulate flow and pressure, so that the terminal is not influenced by load change, and the working speed of the terminal equipment is kept stable. After the speed regulating valve, pressure oil enters the pressure reducing valve, the pressure reducing valve further adjusts the hydraulic oil to the rated pressure of the terminal equipment, the pressure and the flow are configured for the terminal equipment according to needs after the pressure of the hydraulic oil is further stabilized by the energy accumulator connected with the second electromagnetic valve in parallel through the one-way valve, necessary working conditions are provided, and finally the second electromagnetic valve which is normally closed is opened to supply the hydraulic oil for the terminal equipment. The opening of the first electromagnetic valve is used for providing necessary working conditions for the terminal equipment, the upstream operation of the second electromagnetic valve is realized, and the first electromagnetic valve is started to indicate that the centralized pump station is ready for the terminal equipment; and the first electromagnetic valve is closed, and the shutdown of the centralized pump station to the terminal equipment is finished. The second solenoid valve is the direct start/stop operation of the terminal equipment, is the downstream operation of the first solenoid valve, and represents that the terminal equipment is in a working or closed state. The first electromagnetic valve and the second electromagnetic valve jointly complete the electro-hydraulic control of the terminal equipment.
3. The invention carries out the integration design and the integrated arrangement of the centralized pump station and each terminal device in the aspects of principle and composition.
The invention takes the requirement of the terminal equipment as the guide, and simplifies the terminal equipment into a functional module by configuring the terminal equipment with comprehensive measures such as rated pressure, flow, start/stop protection level arrangement, oil cooling and filtering integrated configuration and the like through a centralized pump station. For the terminal equipment, only necessary subsystems are configured according to the functions of the terminal equipment, and peripheral working systems such as pressure, flow, oil temperature, oil filtration and the like do not need to be considered, so that the integrated design and the integrated arrangement of the centralized pump station and the terminal equipment are achieved.
4. The oil supply pump set of the invention is a combination mode of a fixed displacement pump (an inclined shaft type high-pressure plunger pump) and a variable frequency motor. The flow regulation mode is as follows: the flow of the oil pump set is controlled by adjusting the rotating speed of the variable frequency motor. Compare with the compound mode of variable pump plus constant speed motor, its advantage lies in: the flow of the pump set is adjusted by the variable frequency motor under the condition that the pressure of the hydraulic system is constant, and the influence of pressure fluctuation on terminal equipment cannot be caused. While flow regulation between variable displacement pumps is accompanied by pressure fluctuations, affecting pressure constancy.
Furthermore, oil cooling and filtering devices are arranged at the peripheries of the centralized pump station and the terminal equipment branches. The oil liquid cooling and filtering device comprises a cooling oil pump set, wherein the hydraulic input end of the cooling oil pump set is connected with the oil tank, and the hydraulic output end of the cooling oil pump set is connected with the oil tank through a coarse filter, a fine filter and a cooler. Therefore, the oil filtering and oil temperature cooling functions are integrated, when the oil cooling system works, the cooling oil pump set is started, hydraulic oil sequentially passes through the coarse filter and the fine filter and then enters the cooler, and external normal-temperature cooling water circularly flows in the cooler to exchange heat with high-temperature oil in the oil tank, so that high-temperature heat is taken away, and the temperature reduction function is achieved. Compared with the traditional mode that the oil liquid is filtered and the oil temperature is cooled by the centralized pump station on the main pipeline, the hydraulic energy working system has the advantages that the oil return resistance of the central hydraulic source is reduced, and the working efficiency of the hydraulic energy is improved.
Further, the output end of the oil supply pump group is provided with a first-level overflow valve, and the output end of the centralized pump station is provided with a second-level overflow valveThe pressure set value of the first-level overflow valve is the rated pressure P of the oil supply pump group0The pressure set value of the secondary overflow valve is P1，P1－P00.5 to 1 MPa. The first-level overflow valve is a proportional overflow valve, and the pressure setting end of the proportional overflow valve is connected with the output end of the pump station PLC. This has two implications:
the first layer means: the primary overflow valve is used for setting the rated pressure P of the oil supply pump set0(ii) a The secondary overflow valve is used for safety protection. Rated pressure P of outlet of each oil supply pump group in centralized pump station0Constant and equal in value, rated pressure P of each terminal equipment2、P3…Pm+1Are all less than the rated pressure P of the pump station0Namely: p0＞P2、P3…Pm+1。
The second layer means: the one-level overflow valve adopts a proportional overflow valve, and when the oil pump set is started/stopped, the pressure setting of the proportional overflow valve is controlled by the pump station PLC, so that the oil pump can be started/stopped under zero pressure, and the oil pump is prevented from being damaged by pressure impact.
Further, the output end of the centralized pump station and the input end of the second electromagnetic valve are respectively connected with an energy accumulator so as to further stabilize the pressure of the hydraulic oil.
Based on the same inventive concept, the invention provides a hydraulic configuration method of the central hydraulic source shared by a plurality of hydraulic terminal equipment networks, which comprises the following steps:
the rated pressure and rated flow of each terminal device are prestored in the pump station PLC;
when the first terminal equipment works under the action of the hydraulic oil with rated flow and rated pressure provided by the first oil supply pump set and the second terminal equipment needs to work simultaneously, the pump station PLC detects a starting signal of the second terminal equipment, and controls the variable frequency motor of the first oil supply pump group to increase the rotating speed, so that the output flow of the centralized pump station is greater than the sum of the rated flows of the first terminal equipment and the second terminal equipment, meanwhile, each flow sensor detects the output flow of each oil supply pump group in real time and transmits the output flow to the pump station PLC for accumulation to calculate the total output flow of the centralized pump station, if the rotating speed of the variable frequency motor of the first oil supply pump group reaches the maximum value, the total output flow of the centralized pump station still cannot be larger than the sum of the rated flows of the first terminal equipment and the second terminal equipment, starting a second oil supply pump group until the total flow of the output end of the centralized pump station is greater than the sum of the rated flows of the first terminal equipment and the second terminal equipment; continuously adjusting and starting a new oil supply pump set until the total flow of the output end of the centralized pump station is greater than the sum of rated flows of terminal equipment to be started;
when the first terminal equipment works and the second terminal equipment needs to be shut down, the pump station PLC detects a stop signal of the second terminal equipment and controls the variable frequency motor of the first oil supply pump group to reduce the rotating speed, so that the total output flow of the centralized pump station is greater than the rated flow of the first terminal equipment, meanwhile, each flow sensor detects the output flow of each oil supply pump group in real time and transmits the output flow to the pump station PLC for accumulation, the total output flow of the centralized pump station is calculated, and if the rotating speed of the variable frequency motor of the first oil supply pump group is reduced and still cannot reach the rated flow of the first terminal equipment, the pump station PLC controls the variable frequency motor of the second oil supply pump group to stop working until the total output flow of the centralized pump station is greater than the rated flow of the first terminal equipment; and continuously adjusting and closing the new oil supply pump set until the total flow of the output end of the centralized pump station is greater than the sum of rated flows of the terminal equipment to be started.
Further, when the oil supply pump set is started/stopped, the pressure of the corresponding proportional overflow valve is gradually reduced to 0 from a rated value, so that the oil pump is prevented from being damaged by sudden pressure difference impact.
Further, when the terminal equipment is started, the first electromagnetic valve on the corresponding terminal equipment branch is started firstly, the flow is adjusted to be equal to the rated flow of the terminal equipment through the speed regulating valve, then the pressure is adjusted to be equal to the rated pressure of the terminal equipment through the pressure reducing valve, and finally the second electromagnetic valve is started. Therefore, the starting of each terminal device under the action of the hydraulic oil with rated flow and rated pressure is ensured, the instantaneous pressure and flow fluctuation caused by the starting of other terminal devices is avoided, and the coupling and interference phenomena among hydraulic systems of each terminal device are avoided.
Compared with the prior art, the invention has the advantages that:
the invention carries out technical innovation on the traditional centralized pump station, mainly adopts the technologies of adaptive pump station flow matching technology, constant flow constant pressure control on terminal equipment and the like, forms the integrated networking of each terminal equipment and the centralized pump station under the condition of multi-factor coupling, forms the central hydraulic source technology, and has the advantages that: the centralized pump station not only provides rated pressure flow for the terminal equipment, but also performs function fusion on the pump station and the terminal equipment of each branch, embeds the modularized terminal equipment into the centralized pump station to form a central hydraulic source network with multiple terminals, which is in parallel connection and shared, has crosstalk resistance and strong shielding, and has the capability of adaptively matching the flow of the pump station, so that the invention plays an active role in the aspects of improving the reliability of the hydraulic pump station, expanding the equipment capability, improving the use performance and improving the use efficiency.
Drawings
Fig. 1 is a hydraulic schematic diagram of a typical centralized pump station in the prior art.
Fig. 2 is a hydraulic schematic diagram of an embodiment of a central hydraulic source shared by a plurality of hydraulic terminal equipment networks according to the invention.
FIG. 3 is a schematic diagram of the control system of the present invention (arrows in the diagram indicate the input and output relationship between the PLC and each part of the pump station).
In the figure: 1. an oil tank; 2.1-2.3, a low-pressure filter; 3.1-3.2. an oil pump set; 3.3 cooling oil pump group; 4.1-4.2. a high-pressure filter; 4.4. a coarse filter; 4.5. a fine filter; 5.1-5.2, a primary overflow valve; 5.3. a secondary overflow valve; 5.4-5.5. a proportional overflow valve; 6.1-6.4, a one-way valve; 7. an accumulator; 7.1-7.3. an energy accumulator; 8.1-8.2. a first electromagnetic valve; 8.3-8.4. a second electromagnetic valve; 9.1-9.2. a speed regulating valve; 10.1-10.2, a pressure reducing valve; 11.1-11.2. terminal equipment; 12.1-12.2. a flow sensor; 13. an oil liquid cooling and filtering device; 14. a cooler.
Detailed Description
The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.
For convenience of description, the description of the relative position of the components (e.g., up, down, left, right, etc.) is described with reference to the layout direction of the drawings, and does not limit the structure of the patent.
Example 1:
as shown in fig. 2, the embodiment of the present invention based on a hydraulic system shared by a plurality of hydraulic terminal device networks includes a centralized pump station connected to an oil tank, a plurality of terminal device branches connected in parallel to an output end of the centralized pump station, and an oil cooling and filtering device 13 disposed at the periphery of the centralized pump station and the plurality of terminal device branches.
Two oil supply pump sets 3.1-3.2 are adopted as power elements of the centralized pump station (the actual number of the oil supply pump sets is combined according to needs and is not specific), oil is absorbed from the oil tank 1 through the low-pressure filters 2.1-2.2, and two paths of pressure oil output by the oil supply pump sets 3.1-3.2 are combined into the output end of the centralized pump station through the high-pressure filters 4.1-4.2, the flow sensors 12.1-12.2 and the one-way valves 6.1-6.2. The output end of the high-pressure filter 4.1-4.2 is provided with a proportional overflow valve 5.4-5.5 as a primary overflow valve, the output end of the centralized pump station is connected with an energy accumulator 7.1, and a secondary overflow valve 5.3 is arranged between the output end of the centralized pump station and the oil tank 1. In the process, the proportional overflow valves 5.4-5.5 are respectively provided with rated pressure P of two oil supply pump sets 3.1-3.20Pressure set value P of secondary overflow valve 5.31Ratio P0The height is 0.5-1 MPa, and the safety protection effect is achieved; the energy accumulator 7.1 absorbs the pressure pulsation at the output end of the centralized pump station; the flow sensors 12.1-12.2 measure actual flow of the output ends of the oil supply pump units 3.1-3.2 in real time, and the actual flow is transmitted to the pump station PLC to be accumulated, and the total flow of the output ends of the centralized pump station is calculated. The oil supply pump groups 3.1-3.2 respectively adopt a combination mode of a fixed displacement pump (an inclined shaft type high-pressure plunger pump) and a variable frequency motor, and the flow regulation mode is as follows: the flow of the oil supply pump group is adjusted by changing the rotating speed of the variable frequency motor.
The terminal equipment branch comprises first electromagnetic valves 8.1-8.2 (the actual number is combined according to the requirement and is not specific), speed regulating valves 9.1-9.2, pressure reducing valves 10.1-10.2, second electromagnetic valves 8.3-8.4 and terminal equipment 11.1-11.2 which are connected in sequence. The pressure oil at the output end of the centralized pump station respectively passes through the first electromagnetic valves 8.1-8.2, the speed regulating valves 9.1-9.2, the pressure reducing valves 10.1-10.2, the one-way valves 6.3-6.4 and the second electromagnetic valves 8.3-8.4 and then enters the terminal equipment 11.1-11.2. Two oil return paths of the terminal equipment 11.1-11.2 are combined into a total oil return path and are connected with the oil tank 1 through a one-way valve. The cycle work is performed in this way.
The oil liquid cooling and filtering device 13 is provided with a cooling oil pump group 3.3 connected with the oil tank 1, the output end of the cooling oil pump group 3.3 is sequentially provided with a coarse filter 4.4, a fine filter 4.5 and a cooler 14, and oil liquid pumped out by the cooling oil pump group 3.3 enters the cooler 14 for oil liquid cooling after being filtered by the coarse filter 4.4 and the fine filter 4.5 in two stages. Such advantages are: 1. the equipment composition is simplified, the occupied space of the equipment is reduced, and the oil liquid cooling and filtering efficiency is improved; 2. and a filter on the main oil return path is omitted, so that the oil return resistance is reduced.
As shown in figure 3, the control ends and the flow sensors of the first electromagnetic valve and the second electromagnetic valve are respectively connected with the input end of a pump station PLC through an Ethernet, the output end of the pump station PLC is connected with a variable frequency motor of each oil supply pump group through a frequency converter, and each terminal device 11.1-11.2 exchanges data with the pump station PLC through an industrial switch. The pump station PLC is a Siemens PLC with the model number S7-1515. The PLC of the pump station collects the start/stop of each oil supply pump set 3.1-3.2, the blockage of the low-pressure filter 2.1-2.3, the blockage of the high-pressure filter 4.1-4.2, the blockage of the coarse filter 4.4 and the blockage of the fine filter 4.5, the liquid level overrun, the oil temperature overrun and the like, and uploads signals of pressure, flow and oil temperature to the upper computer of each terminal device 11.1-11.2 for display. The pump station PLC communicates with the frequency converter, and the rotating speed of a variable frequency motor of the oil supply pump set is adjusted by changing the frequency of the frequency converter, so that the flow of each oil supply pump set 3.1-3.2 is adjusted.
When the oil pressure control system is used, pressure oil at the output end of the centralized pump station firstly passes through the normally closed first electromagnetic valves 8.1-8.2 before entering each terminal device. When the first electromagnetic valves 8.1-8.2 are started/stopped, starting/stopping signals of the first electromagnetic valves 8.1-8.2 are sent to the pump station PLC, meanwhile, flow sensors 12.1-12.2 monitor the flow of the output ends of the two oil supply pump groups 3.1-3.2 in real time, and the pump station PLC automatically adjusts the oil supply pump groups 3.1-3.2 according to the rated flow of the terminal equipment 11.1-11.2And (4) flow configuration. The PLC of the pump station accumulates the actually measured flow of the flow sensors 12.1-12.2 to calculate the total flow Q of the output end of the centralized pump station0And comparing the sum of the preset rated flow of the terminal equipment 11.1-11.2, and feeding the sum back to a pump station PLC (programmable logic controller), wherein the pump station PLC sends an instruction to a frequency converter according to a comparison result, and the rotating speed of a variable frequency motor of an oil supply pump group 3.1-3.2 (the number of oil supply pump groups is increased/decreased if necessary) is automatically adjusted through the frequency converter so as to adapt to the total flow requirement of each terminal equipment.
Such as: in fig. 2 the terminal equipment 11.1 is in operation and the demanded flow is a litres/minute, which is supplied by the feed pump package 3.1. When the terminal equipment 11.2 needs to work simultaneously, the first electromagnetic valve 8.2 is started, a starting signal of the first electromagnetic valve 8.2 is sent to a pump station PLC, the rotating speed of a variable frequency motor of an oil supply pump group 3.1 is increased instantly, the flow on a total output oil path is larger than (A + B) liter/minute (note that the rated flow of the terminal equipment 11.1 is A and the rated flow of the terminal equipment 11.2 is B), the output flow of each oil supply pump group is detected by flow sensors 12.1-12.2 at the output end of each oil supply pump group in real time and is transmitted to the pump station PLC for accumulation, and the total flow Q at the output end of a centralized pump station is calculated0And the PLC of the pump station concentrates the total flow Q of the output end of the pump station0And comparing the sum of the rated flow of the terminal equipment 11.1-11.2, and adjusting in real time according to the situation. When the rotating speed of the variable frequency motor of the oil supply pump unit 3.1 is increased and still not enough reaches the flow of (A + B) liter/minute, the pump station PLC starts the oil supply pump unit 3.2 to supplement the flow, so that the total flow of the output ends of the centralized pump station is greater than (A + B) liter/minute, and the closed-loop control of the flow is realized. When the variable frequency motor is started, the pressure of a proportional overflow valve 5.2 at the outlet of an oil supply pump group 3.2 is firstly adjusted to 0, and after the variable frequency motor normally operates, the pressure is gradually increased to a rated pressure P0. The oil supply pump group 3.2 is started under zero pressure, so that the purpose of protecting the oil pump is achieved, and the phenomenon that the instantaneous pressure difference is overlarge is avoided.
When the terminal equipment 11.1 still works and the terminal equipment 11.2 needs to be shut down, the first electromagnetic valve 8.2 is closed, a start/stop signal of the first electromagnetic valve is sent to the pump station PLC, the frequency converter of the oil supply pump unit 3.1 is instantaneously reduced in rotating speed, the flow rate is reduced to A liter/minute, and the flow sensors 12.1-12.2 at the output end of each oil supply pump unit detect in real timeMeasure the flow Q1、Q2And then transmitted to the PLC of the pump station for accumulation to calculate the total flow Q of the output end of the centralized pump station0And the PLC of the pump station concentrates the total flow Q of the output end of the pump station0The flow A liter/minute is compared with the flow A liter/minute required by the terminal equipment 11.1, and the flow is adjusted in real time; when the frequency converter reduces the rotating speed of the motor and still cannot reach the flow of A liter/minute, the PLC of the pump station stops the oil supply pump set 3.2 to further reduce the flow, so that the total flow of the output ends of the centralized pump station meets the requirement, and the closed-loop control of the flow is realized. When the engine is stopped, the pressure of a proportional overflow valve 5.2 at the outlet of an oil supply pump group 3.2 is gradually reduced to 0, and then the engine is stopped. The oil feed pump group 3.2 is shut down at zero pressure, the purpose of which is also to protect the oil pump.
In the specific implementation of the invention, the following adjustments can be made:
1. in the combination method, two fuel feed pump groups and two terminal devices are shown in fig. 2, but the present invention is not limited to this, and 2 or N fuel feed pump groups may be provided for 2 or M terminal devices (N, M is a natural number greater than 1), and the combination method may be as shown in fig. 2.
2. Regarding the flow setting, the total flow at the output end of the centralized pump station is set to be Q0The flow rate of each terminal equipment is Q1、Q2…QnThen, Q0The flow rate of each terminal device is greater than the sum of the flow rates of the terminal devices, namely: q0＞Q1+Q2…+Qm。
3. Regarding the pressure setting, the rated pressure at the output end of the centralized pump station is set to be P0Rated pressure of each terminal equipment is P2、P3…Pm+1Then, P0Should be greater than the rated pressure of each terminal device, i.e.: p0＞P2、P3…Pm+1。
The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.
Claims (7)
1. The utility model provides a central hydraulic pressure source based on many hydraulic terminal equipment network deployment sharing, includes the concentrated pump station of parallelly connected constitution of N fuel feeding pump package (3.1 ~ 3.2), parallelly connected M terminal equipment branch road at concentrated pump station output, N, M is for being greater than 1 natural number, a serial communication port, the fuel feeding pump package is inverter motor driven constant delivery pump, the output of fuel feeding pump package (3.1 ~ 3.2) sets gradually flow sensor (12.1 ~ 12.2), one-level overflow valve (5.4 ~ 5.5) respectively, the output of concentrated pump station sets up second grade overflow valve (5.3), and the pressure setting value of one-level overflow valve is the rated pressure P of fuel feeding pump package0The pressure set value of the secondary overflow valve is P1，P1－P00.5-1 MPa; each terminal equipment branch comprises a first electromagnetic valve (8.1-8.2), a speed regulating valve (9.1-9.2), a pressure reducing valve (10.1-10.2), a second electromagnetic valve (8.3-8.4) and terminal equipment which are sequentially connected, the first electromagnetic valve and the second electromagnetic valve are normally closed valves, the first electromagnetic valve of each terminal equipment branch is connected with the output end of the centralized pump station in parallel, and the oil return pipelines of each terminal equipment branch are directly connected with the oil return port of the oil tank after converging; the output end of the centralized pump station and the input end of the second electromagnetic valve are respectively connected with an energy accumulator (7.1-7.3); the total flow of the output end of the centralized pump station is Q0Rated flow rate of each terminal equipment is Q1、Q2…Qm，Q0＞Q1+Q2…+QmThe rated pressure of the oil supply pump group is P0Rated pressure of each terminal equipment is P2、P3…Pm+1，P0＞P2、P3…Pm+1(ii) a The control ends of the first electromagnetic valve and the second electromagnetic valve of each terminal equipment branch and each flow sensor are respectively connected with the input end of a pump station PLC, and the output end of the pump station PLC is connected with the variable frequency motor of each oil supply pump group through a frequency converter.
2. The central hydraulic source based on networking sharing of multiple hydraulic terminal equipment according to claim 1, characterized in that an oil cooling and filtering device (13) is arranged at the periphery of the centralized pump station and the terminal equipment branch.
3. The central hydraulic source based on multiple hydraulic terminal equipment networking sharing of claim 2, characterized in that the oil cooling and filtering device comprises a cooling oil pump set (3.3) with a hydraulic input end connected with the oil tank, and a hydraulic output end of the cooling oil pump set is connected with the oil tank through a coarse filter (4.4), a fine filter (4.5) and a cooler (14).
4. The central hydraulic source shared by a plurality of hydraulic terminal equipment networks according to claim 1, wherein the primary overflow valve is a proportional overflow valve, and the pressure setting end of the proportional overflow valve is connected with the output end of the pump station PLC.
5. A hydraulic configuration method based on a central hydraulic pressure source shared by a plurality of hydraulic terminal equipment networks according to any one of claims 1 to 4, characterized by comprising the following steps:
the rated pressure and rated flow of each terminal device are prestored in the pump station PLC;
when the first terminal equipment works under the action of the hydraulic oil with rated flow and rated pressure provided by the first oil supply pump set and the second terminal equipment needs to work simultaneously, the pump station PLC detects a starting signal of the second terminal equipment, and controls the variable frequency motor of the first oil supply pump group to increase the rotating speed, so that the output flow of the centralized pump station is greater than the sum of the rated flows of the first terminal equipment and the second terminal equipment, meanwhile, each flow sensor detects the output flow of each oil supply pump group in real time and transmits the output flow to the pump station PLC for accumulation to calculate the total output flow of the centralized pump station, if the rotating speed of the variable frequency motor of the first oil supply pump group reaches the maximum value, the total output flow of the centralized pump station still cannot be larger than the sum of the rated flows of the first terminal equipment and the second terminal equipment, starting a second oil supply pump group until the total flow of the output end of the centralized pump station is greater than the sum of the rated flows of the first terminal equipment and the second terminal equipment; continuously adjusting and starting a new oil supply pump set until the total flow of the output end of the centralized pump station is greater than the sum of rated flows of terminal equipment to be started;
when the first terminal equipment works and the second terminal equipment needs to be shut down, the pump station PLC detects a stop signal of the second terminal equipment and controls the variable frequency motor of the first oil supply pump group to reduce the rotating speed, so that the total output flow of the centralized pump station is greater than the rated flow of the first terminal equipment, meanwhile, each flow sensor detects the output flow of each oil supply pump group in real time and transmits the output flow to the pump station PLC for accumulation, the total output flow of the centralized pump station is calculated, and if the rotating speed of the variable frequency motor of the first oil supply pump group is reduced and still cannot reach the rated flow of the first terminal equipment, the pump station PLC controls the variable frequency motor of the second oil supply pump group to stop working until the total output flow of the centralized pump station is greater than the rated flow of the first terminal equipment; and continuously adjusting and closing the new oil supply pump set until the total flow of the output end of the centralized pump station is greater than the sum of rated flows of the terminal equipment to be started.
6. The hydraulic configuration method based on the central hydraulic source shared by a plurality of hydraulic terminal equipment networks according to claim 5, characterized in that when the oil supply pump group is started/stopped, the pressure of the corresponding proportional overflow valve is gradually reduced to 0 from a rated value.
7. The hydraulic configuration method based on the central hydraulic source shared by the plurality of hydraulic terminal equipment in the networking manner according to claim 5, wherein when the terminal equipment is started, the first electromagnetic valve on the branch of the corresponding terminal equipment is started, the flow rate of the terminal equipment is adjusted to be equal to the rated flow rate of the terminal equipment through the speed regulating valve, then the pressure of the terminal equipment is adjusted to be equal to the rated pressure of the terminal equipment through the pressure reducing valve, and finally the second electromagnetic valve is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910767021.9A CN110454470B (en) | 2019-08-20 | 2019-08-20 | Central hydraulic source shared based on multiple hydraulic terminal equipment networking and hydraulic configuration method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910767021.9A CN110454470B (en) | 2019-08-20 | 2019-08-20 | Central hydraulic source shared based on multiple hydraulic terminal equipment networking and hydraulic configuration method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110454470A CN110454470A (en) | 2019-11-15 |
| CN110454470B true CN110454470B (en) | 2021-01-01 |
Family
ID=68487767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910767021.9A Active CN110454470B (en) | 2019-08-20 | 2019-08-20 | Central hydraulic source shared based on multiple hydraulic terminal equipment networking and hydraulic configuration method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110454470B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112727813B (en) * | 2020-11-19 | 2022-07-22 | 宣化钢铁集团有限责任公司 | Parallel operation pump set and use method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3948048B2 (en) * | 1997-02-28 | 2007-07-25 | アイシン精機株式会社 | Vehicle hydraulic control device |
| CN202013270U (en) * | 2010-12-24 | 2011-10-19 | 重庆青山工业有限责任公司 | Hydraulic control circuit of automatic transmission valve body high and low temperature testing stand |
| CN204099315U (en) * | 2014-08-28 | 2015-01-14 | 佛山市恒力泰机械有限公司 | A kind of hydraulic power energy-saving servo control gear |
| CN105443471B (en) * | 2015-12-04 | 2017-09-15 | 湖南三一快而居住宅工业有限公司 | The flow-compensated control system and method for a kind of banked direction control valves and banked direction control valves |
| CN207195334U (en) * | 2017-09-04 | 2018-04-06 | 上海意称液压系统有限公司 | A kind of hydraulic means of track board assembly line |
| CN208634508U (en) * | 2018-08-08 | 2019-03-22 | 安徽唐兴机械装备有限公司 | A kind of main top hydraulic system of jacking construction |
-
2019
- 2019-08-20 CN CN201910767021.9A patent/CN110454470B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110454470A (en) | 2019-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101855442B (en) | Method and device for controlling a fuel supply system | |
| CN102194534B (en) | High-precision pressing and depressing process for pre-service hydraulic pressure test of steam generator secondary side | |
| CN205938521U (en) | Supply nitrogen system in succession | |
| CN110454470B (en) | Central hydraulic source shared based on multiple hydraulic terminal equipment networking and hydraulic configuration method thereof | |
| CN105698242A (en) | High-rise direct-connected heating cycle system | |
| CN109442817B (en) | Water power balance system of plant chilled water supply network | |
| CN103104453B (en) | The controlling method of cooling system and device | |
| CN113090596B (en) | Servomotor system with thermal redundancy backup oil supply and control method thereof | |
| CN214247874U (en) | Energy-saving servo drive hydraulic power source system | |
| CN219974677U (en) | Pipeline pressure control and power generation system | |
| CN203586393U (en) | Heat balancing unit and control device thereof | |
| CN103452958A (en) | Pressure valve debugging system | |
| US20130098468A1 (en) | Hydraulic distribution system employing a dual pump | |
| CN110985218B (en) | Method and system for adjusting pressure of supercharger of gas turbine | |
| CN202948744U (en) | Water supply system adopting once-through steam generator reactor | |
| CN214944453U (en) | Cooling water flow control system of gas turbine cooler | |
| CN110159362B (en) | Steam turbine bypass control system | |
| CN103778984A (en) | Water supply system adopting once-through steam generator reactor | |
| CN100370115C (en) | Servomotor oil circuit regulating valve assembly of steam turbine regulating system | |
| CN202851092U (en) | Circulating water start-up system of steam turbine | |
| CN215949663U (en) | Fuel pressure dynamic adjusting device for engine development and performance test | |
| CN214887387U (en) | Cooling water system for cooling air of turbine of gas turbine | |
| CN204238990U (en) | A kind of energy gradient utilization system of back pressure turbine heat supply | |
| CN112377312B (en) | Self-repairing parallel fuel control system and fault judgment and repair method | |
| CN211202188U (en) | Integrated mechanical hydraulic control device for main distributing valve of super-huge type water turbine speed regulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |