CN114396398B - Active load shedding gear pump and hydraulic system - Google Patents
Active load shedding gear pump and hydraulic system Download PDFInfo
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- CN114396398B CN114396398B CN202111443324.9A CN202111443324A CN114396398B CN 114396398 B CN114396398 B CN 114396398B CN 202111443324 A CN202111443324 A CN 202111443324A CN 114396398 B CN114396398 B CN 114396398B
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- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C15/064—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston machines or pumps
- F04C15/066—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston machines or pumps of the non-return type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
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- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Rotary Pumps (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses an active load-shedding gear pump and a hydraulic system, which mainly relate to the technical field of hydraulic systems, and comprise a main oil way and an auxiliary oil way, so that the application condition of the load oil way is not unique, the main oil way and the auxiliary oil way are communicated with a load on-off slide valve component, the gap between the different loads on flow and pressure is huge, the load requirements of the hydraulic system can not be met simultaneously to work with variable flow, the problem that the load change in a pump set obviously causes resource waste due to the remarkable increase of the flow of the system load can not be solved simultaneously, and a safety oil way is arranged between the auxiliary oil way and an inlet of the main oil way, so that the requirement of the system on the highest safety working pressure is met; the initiative load shedding gear pump adopts integrated design, and under the prerequisite that satisfies the different operating mode requirements of export, safety voltage limiting requirement, export pressure boost requirement, designs into the speed governing variable gear pump structure of integral type, can satisfy large-traffic work, has increased system reliability, stability, the cost is reduced.
Description
Technical Field
The invention relates to the technical field of hydraulic systems, in particular to an active load-shedding gear pump and a hydraulic system.
Background
In the existing hydraulic system technology, the conditions that a load oil way is not unique and the difference between different loads and flow pressure demands is huge cannot be met in the same hydraulic system, the hydraulic system load demands are variable flow work, the maximum and minimum flow supply span proportion can reach 10:1, in addition, when the flow is increased, the load of the system is increased, the load change in a pump set is obvious, so that the condition of resource waste caused by the increase of the system energy is caused, and the requirement of the system on the highest safe working pressure cannot be met at the same time.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides an active load-shedding gear pump and a hydraulic system, which solve the problems that the requirements of different working conditions of multiple outlets, the requirements of safety pressure limiting, the requirements of outlet pressurization and the energy waste cannot be met simultaneously in the prior art.
The technical scheme of the invention is realized as follows: the utility model provides an initiative load shedding hydraulic system, includes the main oil circuit, main oil circuit one end is linked together with the oil inlet, main oil circuit other end intercommunication main oil circuit load, auxiliary oil circuit one end setting is on the main oil circuit, auxiliary oil circuit other end intercommunication auxiliary oil circuit load, safety oil circuit one end setting is on the auxiliary oil circuit, the safety oil circuit other end is linked together with the oil inlet, the main oil circuit is connected with load break-make sliding valve assembly, load break-make sliding valve assembly is linked together with oil return circuit one end, load break-make sliding valve assembly still is linked together with auxiliary oil circuit through the main oil circuit, the oil return circuit other end is linked together with the oil inlet.
Preferably, an inlet of the main oil way is communicated with the oil inlet, a gear pump assembly, an outlet supercharging valve assembly and a main oil way load are sequentially connected to the main oil way along the flow direction, an A channel is arranged between the gear pump assembly and the outlet supercharging valve assembly, a B channel and a differential pressure channel are arranged between the outlet supercharging valve assembly and the main oil way load, and the main oil way is connected with the load on-off slide valve assembly through the A channel, the B channel and the differential pressure channel; the inlet of the auxiliary oil way is arranged between the gear pump assembly and the outlet supercharging valve assembly and is communicated with the channel A, and the outlet of the auxiliary oil way is connected with an auxiliary oil way load; the inlet of the safety oil way is connected to the auxiliary oil way, the safety oil way is provided with a safety valve, and the outlet of the safety oil way is communicated with the oil inlet.
Preferably, the load on-off sliding valve component comprises a valve core, the valve core is connected with a valve sleeve in a sliding fit manner, a load space is arranged on the valve core, the load space is connected with an A channel and a B channel in a matching manner, the oil return channel comprises an oil return channel arranged in the valve core, one end of the oil return channel is connected with the oil return channel, a spring is arranged between the valve core and the valve sleeve, the other end of the oil return channel is communicated with a valve body low-pressure cavity formed by the valve core and the valve sleeve, and a valve body high-pressure cavity formed by the valve core and the valve sleeve is connected between the B channel of the main oil way and a main oil way load through a pressure difference channel.
An active load shedding gear pump applying the principle of an active load shedding hydraulic system comprises a gear pump assembly, wherein the gear pump assembly is connected with an outlet supercharging valve assembly and a load on-off slide valve assembly which are communicated with each other, the gear pump assembly is connected with an auxiliary oil way assembly, and a safety oil way is further communicated between the gear pump assembly and the auxiliary oil way assembly.
Preferably, the gear pump assembly comprises a pump body, one end of the pump body is provided with an oil inlet, the oil inlet is communicated with one end of a main oil way I inside the pump body, a first channel, a pressurizing gear pair and a second channel are sequentially communicated on the main oil way I, the other end of the main oil way I is communicated with an outlet pressurizing valve assembly, one end of the first channel is communicated with an auxiliary oil way assembly, the other end of the first channel is communicated with a load on-off sliding valve assembly, the second channel is communicated with the auxiliary oil way assembly, a driving motor is fixedly arranged on the pump body, and the driving motor penetrates through the pump body and is in transmission connection with the pressurizing gear pair.
Preferably, the load on-off slide valve assembly comprises a valve core, the valve core is arranged in a valve sleeve in a sliding fit manner, the valve sleeve is fixedly arranged in a valve body, one end of the valve core is communicated with the first channel through an oil return channel arranged on the valve body, a spring is arranged between one end of the valve core and the valve body, a valve cover is arranged on the valve body at the other end of the valve core, and load channels which are communicated with the valve sleeve and the outlet supercharging valve assembly are formed in the valve sleeve and the valve body.
Preferably, one end of the valve sleeve is provided with a sealing ring, the other end of the valve sleeve is provided with a tail fin type fixing structure, and a secondary revolving body slideway is arranged in the valve sleeve; the second-level revolving body slideway comprises a first-level slideway and a second-level slideway, and the diameter of the first-level slideway is smaller than that of the second-level slideway; the load channel comprises a grid-type flow channel, an A channel, a B channel and a pressure difference channel, wherein the grid-type flow channel is arranged on the first-stage slideway, the A channel is arranged on the valve body and is communicated with one end of the valve sleeve, the B channel is arranged on the valve body and is communicated with the grid-type flow channel, and the pressure difference channel is arranged on the valve body and is communicated with the other end of the valve sleeve; the valve core is of a five-section type revolving body structure and comprises two sections of core bodies, two sections of connecting bodies and a core plug, wherein the core bodies are connected with the core bodies through the connecting bodies, the diameter of the core bodies is larger than that of the connecting bodies and is in sliding fit connection with a first-stage slideway on the valve sleeve, the core plug is in sliding fit connection with a second-stage slideway on the valve sleeve, the core body at one end of the valve core is connected with the valve body through a spring, the connecting bodies between the core bodies and the valve sleeve form a load space together, and the load space is in fit connection with an outlet pressurizing valve assembly through a channel A, a grid type flow passage and a channel B; the connecting body between the core body and the core plug and the valve sleeve jointly form a valve body low-pressure cavity, and the valve body low-pressure cavity is communicated with an oil return channel on the valve body through an oil return channel arranged at the axis of the connecting body and the valve core; a valve body high-pressure cavity is formed between the core plug and the valve cover and between the core plug and the valve sleeve, and the valve body high-pressure cavity is communicated with the pressure difference channel; the valve cover is provided with an annular groove, an opening is formed in the baffle plate in the annular groove, and the pressure difference channel is communicated with the high-pressure cavity of the valve body through the opening. Preferably, the outlet supercharging valve component comprises a main oil way II, wherein the main oil way II is arranged in the outlet supercharging valve body, one end of the main oil way II is connected with the main oil way I, the main oil way II is sequentially communicated with an A channel, a plug-in type outlet supercharging valve, a B channel and a differential pressure channel, the other end of the main oil way II is arranged in a main oil way load, the main oil way load is arranged at one end of the outlet supercharging valve body, the other end of the outlet supercharging valve body is connected with the pump body, and the outlet supercharging valve body and the valve body are integrally formed.
Preferably, the plug-in type outlet booster valve comprises a booster valve sleeve, a booster valve core is connected in the booster valve sleeve through a spring, one end of the booster valve core is connected with a sealing ring in a matched mode to control the on-off of a main oil way II and the communication between a channel A and a channel B, the sealing ring is fixedly arranged on an outlet booster valve body, the other end of the booster valve sleeve is fixedly connected with the outlet booster valve body, and a differential pressure channel is formed in the outlet booster valve body.
Preferably, the auxiliary oil way assembly comprises an auxiliary oil way valve body, one end of the auxiliary oil way valve body is fixedly connected with the pump body, an auxiliary oil way is arranged in the auxiliary oil way valve body, one end of the auxiliary oil way is communicated with one end of the second channel, the other end of the auxiliary oil way is communicated with an auxiliary oil way load on the auxiliary oil way valve body, the auxiliary oil way is communicated with the first channel through a safety oil way, and a safety valve is arranged on the safety oil way; the safety valve comprises a safety valve body, the safety valve body is fixedly arranged on the auxiliary oil way valve body, an adjusting shaft is adjustably arranged in the safety valve body, the adjusting shaft is connected with a safety valve core in a sliding fit manner, a safety spring matched with the safety valve core is arranged on the adjusting shaft, and the safety valve core closes the safety oil way under the action of the safety spring.
The invention has the beneficial effects that: the integrated active load-shedding gear pump comprises a main oil way and an auxiliary oil way, the application condition that a load oil way is not unique is met, the main oil way and the auxiliary oil way are communicated with a load on-off slide valve component, the requirements of different loads on flow and pressure are huge, the requirements of the hydraulic system on variable flow cannot be met at the same time, the problem that the load change in a pump set obviously causes resource waste due to the fact that the flow of the system load is obviously increased cannot be solved at the same time, and a safety oil way is arranged between the auxiliary oil way and an inlet of the main oil way, so that the requirements of the system on the highest safety working pressure are met; the active load-shedding gear pump adopts an integrated design, and is designed into an integrated speed-regulating variable gear pump structure on the premise of meeting the requirements of different working conditions of multiple outlets, safety pressure limiting requirements and outlet pressurization requirements, so that the reliability of the system is improved, the cost is reduced, and the design of the outlet pressurization valve assembly realizes large-flow work in a limited space, and the stability is good and the flow is large.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required for the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic illustration of the principle of an active load shedding hydraulic system of the present invention;
FIG. 2 is a schematic diagram of a first system state when the auxiliary oil circuit load is on;
FIG. 3 is a schematic diagram of a second system state when the auxiliary oil circuit load is on;
FIG. 4 is a schematic diagram of a third system state when the auxiliary oil circuit load is on;
FIG. 5 is a schematic diagram of a fourth system state when the auxiliary oil circuit load is on;
FIG. 6 is a schematic diagram of a fifth system state when the auxiliary oil circuit load is off;
FIG. 7 is a schematic diagram of a first system state when the auxiliary oil circuit load is off;
FIG. 8 is a schematic diagram of a second system state when the auxiliary oil circuit load is off;
FIG. 9 is a schematic diagram of a third system state when the auxiliary oil circuit load is off;
FIG. 10 is a schematic diagram of a fourth system state when the auxiliary oil circuit load is off;
FIG. 11 is a schematic perspective view of an active load shedding gear pump according to the present invention;
FIG. 12 is a schematic view of the cross-sectional structure of A-A of FIG. 11 in accordance with the present invention;
FIG. 13 is a schematic view of the cross-sectional structure B-B of FIG. 12 in accordance with the present invention;
FIG. 14 is a schematic view of the gear pump assembly, auxiliary oil circuit assembly, and safety oil circuit configuration of the present invention;
fig. 15 is a schematic view of the valve housing structure of the present invention.
In the figure: 1: oil inlet, 2: main oil line, 3: main oil line load, 4: auxiliary oil line, 5: auxiliary oil circuit load, 6: safety oil circuit, 7: load on-off spool valve assembly, 8: oil return path, 9: gear pump assembly, 10: outlet pressurization valve assembly, 11: a channel, 12: b channel, 13: differential pressure channel, 14: safety valve, 15: valve core, 16: valve body, 17: load space, 18: oil return passage, 19: spring, 20: valve body low pressure cavity, 21: valve body high pressure cavity, 22: auxiliary oil circuit subassembly, 23: pump body, 24: first channel, 25: pressurizing gear pair, 26: second channel, 27: drive motor, 28: valve housing, 29: valve cover, 30: grid-type flow channel, 31: outlet pressurization valve body, 32: cartridge outlet boost valve, 33: pressurized valve sleeve, 34: pressurizing valve core, 35: sealing ring, 36: auxiliary oil line valve body, 37: safety valve body, 38: adjusting shaft, 39: safety valve core, 40: and a safety spring.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 10, embodiment 1, an active load shedding hydraulic system includes an oil inlet 1, a main oil path 2 is disposed behind the oil inlet 1 along a flow direction, one end of the main oil path 2 is communicated with the oil inlet 1, the other end of the main oil path 2 is communicated with a main oil path load 3, one end of an auxiliary oil path 4 is disposed on the main oil path 2, the other end of the auxiliary oil path 4 is communicated with an auxiliary oil path load 5, one end of a safety oil path 6 is disposed on the auxiliary oil path 4, the other end of the safety oil path 6 is communicated with the oil inlet 1, the main oil path 2 is connected with a load on-off slide valve assembly 7, the load on-off slide valve assembly 7 is communicated with one end of an oil return path 8, the load on-off slide valve assembly 7 is also communicated with the auxiliary oil path 4 through the main oil path 2, and the other end of the oil return path 8 is communicated with the oil inlet 1; the design of main oil circuit and auxiliary oil circuit can satisfy the application condition that the load oil circuit is not unique, and main oil circuit and auxiliary oil circuit intercommunication have load break-make sliding valve assembly, satisfy that different loads are huge to flow pressure demand gap, can't satisfy simultaneously for variable flow work to hydraulic system load demand and can't solve simultaneously that the system load is showing and is leading to the obvious problem of bringing the wasting of resources of load variation in the pump package in the flow increase, be provided with safe oil circuit between auxiliary oil circuit and the main oil circuit entry, satisfied the demand of system to the highest safe operating pressure.
In the embodiment 2, on the basis of the embodiment 1, an inlet of a main oil way 2 is communicated with an oil inlet 1, a gear pump assembly 9, an outlet pressurizing valve assembly 10 and a main oil way load 3 are sequentially connected to the main oil way 2 along the flow direction, the gear pump assembly 9 is used for providing the required flow medium pressure for the system, the outlet pressurizing valve assembly 10 is used for limiting the minimum outlet pressure, an A channel 11 is arranged between the gear pump assembly 9 and the outlet pressurizing valve assembly 10, a B channel 12 and a differential pressure channel 13 are arranged between the outlet pressurizing valve assembly 10 and the main oil way load 3, and the main oil way 2 is connected with a load on-off slide valve assembly 7 through the A channel 11, the B channel 12 and the differential pressure channel 13; the inlet of the auxiliary oil way 4 is arranged between the gear pump assembly 9 and the outlet supercharging valve assembly 10 and is communicated with the A channel 11, and the outlet of the auxiliary oil way 4 is connected with the auxiliary oil way load 5; the inlet of the safety oil way 6 is connected to the auxiliary oil way 4, the safety oil way 6 is provided with a safety valve 14, the safety valve 14 is used for limiting the highest output pressure of the gear pump, and the outlet of the safety oil way 6 is communicated with the oil inlet 1; the load on-off sliding valve assembly 7 comprises a valve core 15, the valve core 15 is connected with a valve sleeve 28 in a sliding fit manner, a load space 17 is arranged on the valve core 15, the load space 17 is connected with an A channel 11 and a B channel 12 in a matching manner, an oil return channel 8 comprises an oil return channel 18 arranged in the valve core 15, one end of the oil return channel 18 is connected with the oil return channel 8, a spring 19 is arranged between the valve core 15 and the valve sleeve 28, the spring 19 is used for setting the pressure for opening and closing the load space 17, the other end of the oil return channel 18 is communicated with a valve body low-pressure cavity 20 formed by the valve core 15 and the valve sleeve 28, and a valve body high-pressure cavity 21 formed by the valve core 15 and the valve sleeve 28 is connected between the B channel 12 of the main oil way 2 and the main oil way load 3 through a differential pressure channel 13.
When the embodiment is applied, when the auxiliary oil way load 5 is opened and the total load flow is smaller, as shown in fig. 2, the gear pump assembly 9 operates, the outlet pressurizing valve assembly 10 on the main oil way 2 limits the pressure, the main oil way 2 after the outlet pressurizing valve assembly 10 along the flow direction is closed, the working pressure of the auxiliary oil way 4 is ensured to be a required value, at the moment, the pressure difference between the high-pressure cavity 21 of the valve body and the low-pressure cavity 20 of the valve body does not reach the requirement of the communication pressure, the valve core 15 is close to the right side under the action of the oil pressure of the spring 19 and the oil return way 8, and at the moment, the channel A11 and the channel B12 are not communicated; as shown in fig. 3, as the gear pump assembly 9 operates to drive the total flow of load to increase, the power consumption of the gear pump assembly 9 increases, the outlet pressurizing valve assembly 10 is gradually opened, the flow of the main oil path 2 starts to increase, and the total flow of the system starts to increase, but at this time, the pressure difference between the high-pressure cavity 21 of the valve body and the low-pressure cavity 20 of the valve body does not reach the requirement of communication pressure, and the valve core 15 is close to the right side under the action of the spring and the oil pressure of the oil return path 8; as shown in fig. 4 and 5, as the total load flow continues to increase, the gear pump assembly is pressurized, the pressure of the main oil path 2 increases, the pressure difference between the high-pressure cavity 21 of the valve body and the low-pressure cavity 20 of the valve body reaches the requirement of communication pressure, the valve core 15 moves the compression spring 19 leftwards, the liquid in the low-pressure cavity 20 of the valve body is pressed into the oil return channel 18 so as to enter the oil return channel 8, the load space 17 is communicated with the channel a 11 and the channel B12, the outlet pressurizing valve assembly 10 is short-circuited, the outlet of the gear pump assembly 9 is directly communicated with the load 3 of the main oil path, the load of the gear pump assembly 9 is reduced, and the power consumption of the gear pump assembly 9 is reduced; when the highest pressure output by the gear pump assembly 9 is greater than the highest defined pressure of the system, as shown in fig. 6, the relief valve 14 in the relief oil passage 6 is opened and the output end of the gear pump communicates with the oil inlet 1 through the relief oil passage 6, thereby maintaining the entire system within the relief pressure range.
When the auxiliary oil way load 5 is closed, as shown in fig. 7, the auxiliary oil way 4 is closed, the main oil way 2 is in a working state under the condition of small total load flow, the pressure difference between the valve body high-pressure cavity 21 and the valve body low-pressure cavity 20 does not reach the requirement of communication pressure, and the valve core 15 is close to the right side under the action of the spring 19 and the oil pressure of the oil return way 8; as shown in fig. 8 and 9, the main oil path load 3 is gradually boosted due to the increase of the medium flow, the system load is increased, the outlet load of the gear pump assembly is also gradually boosted, when the main oil path load 3 is increased to the opening setting value of the load on-off sliding valve, the pressure difference between the valve body high-pressure cavity 21 connected with the main oil path 2 and the valve body low-pressure cavity 20 reaches the requirement of communication pressure, the valve core 15 moves to the left side under the action of the right side pressure, the A channel 11 is communicated with the B channel 12, the outlet boosting valve assembly 10 is short-circuited, the outlet boosting valve assembly 10 is closed, the outlet of the gear pump assembly 9 is directly communicated with the main oil path load 3, the load of the gear pump assembly 9 is reduced, and the power consumption is reduced; as shown in fig. 10, when the highest pressure output by the gear pump is greater than the highest limiting pressure of the system, the safety valve 14 in the safety oil path 6 is opened, and the output end of the gear pump is communicated with the oil inlet 1 through the safety oil path 6, so that the whole system is maintained within the safety pressure range; when the system load flow is reduced, the pressure difference between the valve body high-pressure cavity 21 and the valve body low-pressure cavity 20 is lower than the communication pressure requirement, the valve core moves right, the A channel 11 is disconnected with the B channel 12, the outlet supercharging valve component 10 is opened, and the system is restored.
When the auxiliary oil circuit load 5 is opened, the auxiliary oil circuit load 5 is manually closed along with the gradual opening of the outlet pressurizing valve assembly 10, and the main oil circuit continues to work, wherein the working state is consistent with the state when the main oil circuit load is closed.
As shown in fig. 11, embodiment 3, based on embodiment 2, an active load-reducing gear pump applying the principle of the active load-reducing hydraulic system described above, comprising a gear pump assembly 9, wherein the gear pump assembly 9 is used for providing a desired flow medium pressure to the system, the gear pump assembly 9 is connected with an outlet pressurizing valve assembly 10 and a load-on-off slide valve assembly 7 which are communicated, a secondary oil path assembly 22 is connected to the gear pump assembly 9, and a safety oil path 6 is also communicated between the gear pump assembly 9 and the secondary oil path assembly 22; the scheme is based on the principle of the active load shedding hydraulic system, and on the premise of meeting the requirements of different working conditions of multiple outlets, safety pressure limiting requirements and outlet pressurization requirements, an integrated design is adopted, and the integrated speed-regulating variable gear pump structure is designed, so that the reliability of the system is improved, the cost is reduced, and the design of the outlet pressurization valve assembly 10 realizes large-flow work in a limited space, and has good stability and large flow.
As shown in fig. 12-14, in embodiment 4, on the basis of embodiment 3, the gear pump assembly 9 includes a pump body 23, one end of the pump body 23 is provided with an oil inlet 1, the oil inlet 1 is communicated with one end of a main oil path I inside the pump body 23, the main oil path I is sequentially communicated with a first channel 24, a pressurizing gear pair 25 and a second channel 26, the other end of the main oil path I is communicated with the outlet pressurizing valve assembly 10, one end of the first channel 24 is communicated with a secondary oil path assembly 22, the other end of the first channel is communicated with the load on-off slide valve assembly 12, the second channel 26 is communicated with the secondary oil path assembly 22, a driving motor 27 is fixedly arranged on the pump body 23, and the driving motor 27 penetrates the pump body 23 to be in transmission connection with the pressurizing gear pair 25.
Embodiment 5, on the basis of embodiment 4, the load on-off slide valve assembly 7 comprises a valve core 15, the valve core 15 is arranged in a valve sleeve 28 in a sliding fit manner, the valve sleeve 28 is fixedly arranged in a valve body 16, one end of the valve core 15 is communicated with a first channel 24 through an oil return channel 8 arranged on the valve body 16, a spring 19 is arranged between one end of the valve core 15 and the valve body 16, a valve cover 29 is arranged on the valve body 16 at the other end of the valve core 15, and load channels which are communicated with the inner space of the valve sleeve 28 and the outlet supercharging valve assembly 10 are arranged on the valve sleeve 28 and the valve body 16.
As shown in fig. 15, in embodiment 6, on the basis of embodiment 5, a sealing ring is disposed at one end of the valve sleeve 28, a tail fin type fixing structure is disposed at the other end of the valve sleeve 28, and a secondary revolving body slideway is disposed inside the valve sleeve 28; the second-level revolving body slideway comprises a first-level slideway and a second-level slideway, and the diameter of the first-level slideway is smaller than that of the second-level slideway; the load channel comprises a grid-type flow channel 30, an A channel 11, a B channel 12 and a pressure difference channel 13, wherein the grid-type flow channel 30 is arranged on a first-stage slideway, the A channel 11 is arranged on the valve body 16 and is communicated with one end of the valve sleeve 28, the B channel 12 is arranged on the valve body 16 and is communicated with the grid-type flow channel 30, and the pressure difference channel 13 is arranged on the valve body 16 and is communicated with the other end of the valve sleeve 28; the valve core 15 is a five-section type revolving body structure and comprises two sections of core bodies, two sections of connecting bodies and a core plug, wherein the core bodies are connected with the core bodies through the connecting bodies, the diameter of the core bodies is larger than that of the connecting bodies and is in sliding fit connection with a first-stage slideway on the valve sleeve 28, the core plug is in sliding fit connection with a second-stage slideway on the valve sleeve 28, the core body at one end of the valve core 15 is connected with the valve body 16 through a spring 19, the connecting bodies between the core bodies and the valve sleeve 28 jointly form a load space 17, and the load space 17 is in fit connection with the outlet pressurizing valve assembly 10 through the A channel 11, the grid type flow channel 30 and the B channel 12; the connecting body between the core body and the core plug and the valve sleeve 28 jointly form a valve body low-pressure cavity 20, and the valve body low-pressure cavity 20 is communicated with an oil return channel 8 on the valve body 16 through an oil return channel 18 arranged at the axis of the connecting body and the valve core; a valve body high-pressure cavity 21 is formed between the core plug and the valve cover 29 and between the core plug and the valve sleeve 28, and the valve body high-pressure cavity 21 is communicated with the pressure difference channel 13; the valve cover 29 is provided with an annular groove, an opening is formed in a baffle plate in the annular groove, and the pressure difference channel 13 is communicated with the valve body high-pressure cavity 21 through the opening.
When the valve sleeve is used, the grid-type runner and the tail wing type fixing structure are adopted, the minimum installation stability of the structure is ensured, the medium runner is also in a straight-through type, the flow resistance is small, the installation of a product system is also facilitated, the valve core and the valve sleeve opening part are subjected to linear sealing, and meanwhile, after the valve core outer circle and the valve sleeve are subjected to clearance fit processing, secondary sealing can be performed, so that the sealing performance is ensured; the right end of the valve sleeve is slotted and communicated with the main oil way system, medium enters the annular groove of the valve cover and enters the right end of the valve core through the opening, so that the valve core can timely sense load change, and meanwhile, the annular groove flow channel performs certain flow restriction on the medium, so that the valve core is prevented from moving too frequently and severely, and the working stability is ensured.
Embodiment 7, on the basis of embodiment 6, the outlet pressurization valve assembly 10 includes a main oil path II, wherein the main oil path II is disposed in the outlet pressurization valve body 31, one end of the main oil path II is connected with the main oil path I, the main oil path II is sequentially connected with the a channel 11, the cartridge outlet pressurization valve 32, the B channel 12 and the differential pressure channel 13, the other end of the main oil path II is disposed in the main oil path load 3, the main oil path load 3 is disposed at one end of the outlet pressurization valve body 31, the other end of the outlet pressurization valve body 31 is connected with the pump body 23, and the outlet pressurization valve body 31 and the valve body 16 are integrally formed.
In embodiment 8, based on embodiment 7, the plug-in outlet booster valve 32 includes a booster valve sleeve 33, a booster valve core 34 is connected in the booster valve sleeve 33 through a spring 19, one end of the booster valve core 34 is connected with a sealing ring 35 in a matching manner to control on-off of a main oil path II and communication between the channel a 11 and the channel B12, the sealing ring 35 is fixedly arranged on an outlet booster valve body 31, the other end of the booster valve sleeve 33 is fixedly connected with the outlet booster valve body 31, and the outlet booster valve body 31 is communicated with a differential pressure channel 13 behind the booster valve sleeve 33 along the flow direction of the main oil path II.
In embodiment 9, on the basis of embodiment 8, the auxiliary oil circuit assembly 22 includes an auxiliary oil circuit valve body 36, one end of the auxiliary oil circuit valve body 36 is fixedly connected with the pump body 23, an auxiliary oil circuit 4 is disposed in the auxiliary oil circuit valve body 36, one end of the auxiliary oil circuit 4 is communicated with one end of the second channel 26, the other end of the auxiliary oil circuit 4 is communicated with the auxiliary oil circuit load 5 on the auxiliary oil circuit valve body 36, the auxiliary oil circuit 4 is communicated with the first channel 24 through the safety oil circuit 6, and the safety valve 14 is disposed on the safety oil circuit 6.
In embodiment 10, based on embodiment 9, the relief valve 14 includes a relief valve body 37, the relief valve body 37 is fixedly disposed on the auxiliary oil way valve body 36, an adjusting shaft 38 is adjustably disposed in the relief valve body 37, the adjusting shaft 38 is slidably connected with a relief valve core 39, a relief spring 40 matched with the relief valve core 39 is disposed on the adjusting shaft 38, the relief valve core 39 closes the relief oil way 6 under the action of the relief spring 40, when the pressure in the system reaches a safety critical value, the relief valve core 39 is pushed open, and the relief oil way 6 is opened.
When the embodiment is applied, when the auxiliary oil way load 5 is opened and the total flow of the load is smaller, the driving motor 27 of the gear pump assembly 9 drives the pressurizing gear 25 to operate, the pressurizing valve core 34 is used for limiting the pressure under the action of the spring 19, the pressurizing valve core 34 is not communicated with the main oil way load 3, the pressure at the auxiliary oil way load 5 is a normal value, at the moment, the pressure difference between the valve body high-pressure cavity 21 communicated with the main oil way II through the pressure difference channel 13 and the valve body low-pressure cavity 20 does not reach the requirement of communicating pressure, the valve core 15 is connected with the valve cover 29 under the action of the spring 19 and the oil return channel 8, and at the moment, the channels A and B are not communicated; as the driving motor 27 drives the pressurizing gear pair 25 to operate so as to drive the total load flow to increase, the power consumption of the driving motor 27 is increased, the pressurizing valve core 34 is gradually opened, the total system flow starts to increase, but at the moment, the pressure difference between the high-pressure cavity 21 of the valve body and the low-pressure cavity 20 of the valve body does not reach the requirement of the communication pressure, the valve core 15 is still connected with the valve cover 29 under the action of the spring 19 and the oil return channel 8, as the total load flow continues to increase, the pressure difference between the high-pressure cavity 21 of the valve body and the low-pressure cavity 20 of the valve body reaches the requirement of the communication pressure, the valve core 15 moves axially away from the valve cover 29, the liquid in the low-pressure cavity 20 of the valve body is pressed into the oil return channel 18 so as to enter the oil return channel 8, the load space 17 is communicated with the A channel 11 and the B channel 12, at the moment, the outlet pressurizing valve assembly 10 is short-circuited, the outlet of the gear pump assembly 9 is directly communicated with the load 3 of the main oil channel, the load of the gear pump assembly 9 is reduced, and the power consumption of the gear pump assembly 9 is reduced; when the highest pressure output by the gear pump assembly 9 is greater than the highest defined pressure of the system, the relief valve 14 in the relief oil passage 6 is opened, in particular the relief spring 40 is compressed by the relief valve element 39, the relief valve element 39 opens the relief oil passage 6, and the output end of the gear pump communicates with the oil inlet 1 through the relief oil passage 6, thereby maintaining the whole system within a relief pressure range.
When the auxiliary oil way load 5 is closed, under the condition of small total load flow, the driving motor 27 of the gear pump assembly 9 drives the pressurizing gear 25 to operate, the pressurizing valve core 34 limits pressure under the action of the spring 19, but due to small total flow, at the moment, the pressure difference between the valve body high-pressure cavity 21 communicated with the main oil way II through the pressure difference channel 13 and the valve body low-pressure cavity 20 does not reach the requirement of communication pressure, the valve core 15 is still connected with the valve cover 29 under the action of the spring 19 and the oil return channel 8, as the total load flow continues to increase, the pressure of the main oil way II continues to increase, the pressure difference between the valve body high-pressure cavity 21 and the valve body low-pressure cavity 20 reaches the requirement of communication pressure, the valve core 15 axially moves away from the valve cover 29, liquid in the valve body low-pressure cavity 20 is pressed into the oil return channel 18 to enter the oil return channel 8, the load space 17 is communicated with the A channel 11 and the B channel 12, at the moment, the outlet pressurizing valve assembly 10 is shorted, the outlet of the gear pump assembly 9 is directly communicated with the main oil way load 3, the load of the gear pump assembly 9 is lowered, and the power consumption of the gear pump assembly 9 is lowered; when the highest pressure output by the gear pump assembly 9 is greater than the highest limiting pressure of the system, the safety valve 14 in the safety oil path 6 is opened, specifically the safety spring 40 is compressed by the safety valve core 39, the safety valve core 39 opens the safety oil path 6, and the output end of the gear pump is communicated with the oil inlet 1 through the safety oil path 6, so that the whole system is maintained within the safety pressure range; when the system load flow is reduced, the pressure difference between the valve body high-pressure cavity 21 and the valve body low-pressure cavity 20 is lower than the communication pressure requirement, the valve core 15 is reset under the action of the spring 19, the A channel 11 is disconnected from the B channel 12, the outlet supercharging valve component 10 is opened, and the system is restored.
When the auxiliary oil circuit load 5 is opened, the auxiliary oil circuit load 5 is manually closed along with the gradual opening of the outlet pressurizing valve assembly 10, and the main oil circuit continues to work, wherein the working state is consistent with the state when the main oil circuit load is closed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. An active load shedding hydraulic system, characterized in that: the oil return device comprises a main oil way (2), one end of the main oil way (2) is communicated with an oil inlet (1), the other end of the main oil way (2) is communicated with a main oil way load (3), one end of an auxiliary oil way (4) is arranged on the main oil way (2), the other end of the auxiliary oil way (4) is communicated with an auxiliary oil way load (5), one end of a safety oil way (6) is arranged on the auxiliary oil way (4), the other end of the safety oil way (6) is communicated with the oil inlet (1), the main oil way (2) is connected with a load on-off sliding valve assembly (7), the load on-off sliding valve assembly (7) is communicated with one end of an oil return way (8), the load on-off sliding valve assembly (7) is also communicated with the auxiliary oil way (4) through the main oil way (2), and the other end of the oil return way (8) is communicated with the oil inlet (1).
An inlet of the main oil way (2) is communicated with the oil inlet (1), a gear pump assembly (9), an outlet supercharging valve assembly (10) and a main oil way load (3) are sequentially connected to the main oil way (2) along the flow direction, an A channel (11) is arranged between the gear pump assembly (9) and the outlet supercharging valve assembly (10), a B channel (12) and a differential pressure channel (13) are arranged between the outlet supercharging valve assembly (10) and the main oil way load (3), and the main oil way (2) is connected with a load on-off slide valve assembly (7) through the A channel (11), the B channel (12) and the differential pressure channel (13); the inlet of the auxiliary oil way (4) is arranged between the gear pump assembly (9) and the outlet supercharging valve assembly (10) and is communicated with the A channel (11), and the outlet of the auxiliary oil way (4) is connected with an auxiliary oil way load (5); an inlet of the safety oil way (6) is connected to the auxiliary oil way (4), a safety valve (14) is arranged on the safety oil way (6), and an outlet of the safety oil way (6) is communicated with the oil inlet (1);
the on-off sliding valve assembly (7) comprises a valve core (15), the valve core (15) is connected with a valve sleeve (28) in a sliding fit mode, a load space (17) is arranged on the valve core (15), the load space (17) is connected with an A channel (11) and a B channel (12) in a matching mode, an oil return channel (8) comprises an oil return channel (18) arranged in the valve core (15), one end of the oil return channel (18) is connected with the oil return channel (8), a spring (19) is arranged between the valve core (15) and the valve sleeve (28), the other end of the oil return channel (18) is communicated with a valve body low-pressure cavity (20) formed by the valve core (15) and the valve sleeve (28), and a valve body high-pressure cavity (21) formed by the valve core (15) and the valve sleeve (28) is connected between the B channel (12) of a main oil way (2) and the main oil way load (3) through a differential pressure channel (13).
2. An active load shedding gear pump having an active load shedding hydraulic system according to claim 1, characterized in that: the hydraulic pump comprises a gear pump assembly (9), wherein the gear pump assembly (9) is connected with an outlet supercharging valve assembly (10) and a load on-off slide valve assembly (7) which are communicated with each other, the gear pump assembly (9) is connected with a secondary oil way assembly (22), and a safety oil way (6) is further communicated between the gear pump assembly (9) and the secondary oil way assembly (22).
3. The active load shedding gear pump of claim 2, wherein: the gear pump assembly (9) comprises a pump body (23), one end of the pump body (23) is provided with an oil inlet (1), the oil inlet (1) is communicated with one end of a main oil way inside the pump body (23), a first channel (24), a pressurizing gear pair (25) and a second channel (26) are sequentially communicated on the main oil way, the other end of the main oil way is communicated with an outlet pressurizing valve assembly (10), one end of the first channel (24) is communicated with an auxiliary oil way assembly (22), the other end of the first channel is communicated with a load on-off sliding valve assembly (12), the second channel (26) is communicated with the auxiliary oil way assembly (22), a driving motor (27) is fixedly arranged on the pump body (23), and the driving motor (27) penetrates through the pump body (23) to be in transmission connection with the pressurizing gear pair (25).
4. The active load shedding gear pump of claim 3, wherein: the on-off sliding valve assembly (7) comprises a valve core (15), the valve core (15) is arranged in a valve sleeve (28) in a sliding fit mode, the valve sleeve (28) is fixedly arranged in a valve body (16), one end of the valve core (15) is communicated with a first channel (24) through an oil return channel (8) arranged on the valve body (16), a spring (19) is arranged between one end of the valve core (15) and the valve body (16), a valve cover (29) is arranged on the valve body (16) at the other end of the valve core (15), and load channels which are communicated with the valve sleeve (28) and an outlet supercharging valve assembly (10) are formed in the valve sleeve (28) and the valve body (16).
5. The active load shedding gear pump of claim 4, wherein: one end of the valve sleeve (28) is provided with a sealing ring, the other end of the valve sleeve (28) is provided with a tail fin type fixing structure, and a secondary revolving body slideway is arranged inside the valve sleeve (28); the second-level revolving body slideway comprises a first-level slideway and a second-level slideway, and the diameter of the first-level slideway is smaller than that of the second-level slideway; the load channel comprises a grid type flow channel (30), an A channel (11), a B channel (12) and a pressure difference channel (13), wherein the grid type flow channel (30) is arranged on the first-stage slideway, the A channel (11) is arranged on the valve body (16) and is communicated with one end of the valve sleeve (28), the B channel (12) is arranged on the valve body (16) and the B channel (12) is communicated with the grid type flow channel (30), and the pressure difference channel (13) is arranged on the valve body (16) and is communicated with the other end of the valve sleeve (28); the valve core (15) is of a five-section type revolving body structure and comprises two sections of core bodies, two sections of connecting bodies and a core plug, the core bodies are connected with the core body, the core body and the core plug through the connecting bodies, the diameter of the core body is larger than that of the connecting bodies and is in sliding fit connection with a first-stage slideway on the valve sleeve (28), the core plug is in sliding fit connection with a second-stage slideway on the valve sleeve (28), the core body at one end of the valve core (15) is connected with the valve body (16) through a spring (19), the connecting bodies between the core bodies and the valve sleeve (28) jointly form a load space (17), and the load space (17) is in fit connection with the outlet pressurizing valve assembly (10) through an A channel (11), a grid type flow channel (30) and a B channel (12); the connecting body between the core body and the core plug and the valve sleeve (28) form a valve body low-pressure cavity (20), and the valve body low-pressure cavity (20) is communicated with an oil return channel (8) on the valve body (16) through an oil return channel (18) arranged at the axis of the connecting body and the valve core; a valve body high-pressure cavity (21) is formed between the core plug and the valve cover (29) and between the core plug and the valve sleeve (28), and the valve body high-pressure cavity (21) is communicated with the pressure difference channel (13); an annular groove is arranged on the valve cover (29), an opening is arranged on the baffle plate in the annular groove, and the pressure difference channel (13) is communicated with the high-pressure cavity (21) of the valve body through the opening.
6. The active load shedding gear pump of claim 5, wherein: the outlet supercharging valve assembly (10) comprises a main oil way, the main oil way is arranged in an outlet supercharging valve body (31), one end of the main oil way II is connected with the main oil way, an A channel (11), a plug-in type outlet supercharging valve (32), a B channel (12) and a differential pressure channel (13) are sequentially communicated on the main oil way II, the other end of the main oil way II is arranged in a main oil way load (3), the main oil way load (3) is arranged at one end of the outlet supercharging valve body (31), the other end of the outlet supercharging valve body (31) is connected with a pump body (23), and the outlet supercharging valve body (31) and the valve body (16) are integrally formed.
7. The active load shedding gear pump of claim 6, wherein: the plug-in type outlet booster valve (32) comprises a booster valve sleeve (33), a booster valve core (34) is connected in the booster valve sleeve (33) through a spring (19), one end of the booster valve core (34) is connected with a sealing ring (35) in a matched mode to control the on-off of a main oil way II and the communication between an A channel (11) and a B channel (12), the sealing ring (35) is fixedly arranged on an outlet booster valve body (31), the other end of the booster valve sleeve (33) is fixedly connected with the outlet booster valve body (31), and a pressure difference channel (13) is formed in the outlet booster valve body (31).
8. The active load shedding gear pump of claim 7, wherein: the auxiliary oil way assembly (22) comprises an auxiliary oil way valve body (36), one end of the auxiliary oil way valve body (36) is fixedly connected with the pump body (23), an auxiliary oil way (4) is arranged in the auxiliary oil way valve body (36), one end of the auxiliary oil way (4) is communicated with one end of the second channel (26), the other end of the auxiliary oil way (4) is communicated with an auxiliary oil way load (5) on the auxiliary oil way valve body (36), the auxiliary oil way (4) is communicated with the first channel (24) through a safety oil way (6), and a safety valve (14) is arranged on the safety oil way (6); the safety valve (14) comprises a safety valve body (37), the safety valve body (37) is fixedly arranged on the auxiliary oil way valve body (36), an adjusting shaft (38) is arranged in the safety valve body (37) in an adjustable mode, the adjusting shaft (38) is connected with a safety valve core (39) in a sliding fit mode, a safety spring (40) matched with the safety valve core (39) is arranged on the adjusting shaft (38), and the safety valve core (39) closes the safety oil way (6) under the action of the safety spring (40).
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