CN107725523B - Load-sensitive multiway valve and engineering machinery with same - Google Patents
Load-sensitive multiway valve and engineering machinery with same Download PDFInfo
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- CN107725523B CN107725523B CN201711121123.0A CN201711121123A CN107725523B CN 107725523 B CN107725523 B CN 107725523B CN 201711121123 A CN201711121123 A CN 201711121123A CN 107725523 B CN107725523 B CN 107725523B
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- 239000012530 fluid Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 203
- 239000010720 hydraulic oil Substances 0.000 description 16
- 238000009434 installation Methods 0.000 description 14
- 238000005265 energy consumption Methods 0.000 description 11
- 238000013016 damping Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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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
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
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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
- 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
- F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
- F15B13/0417—Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
- F16K11/0716—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides with fluid passages through the valve member
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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
- F15B2013/0412—Valve members; Fluid interconnections therefor with three positions
Abstract
The invention provides a load-sensitive multi-way valve and engineering machinery with the same, wherein the load-sensitive multi-way valve comprises: an oil tank; the valve body is internally limited with a cavity communicated with the oil tank and is provided with an oil inlet, a feedback oil port, an oil return port and a working oil port which are communicated with the cavity, wherein the feedback oil port, the oil return port and the working oil port are respectively two and are symmetrically arranged at two sides of the oil inlet; the main valve core is movably arranged in the cavity to switch different oil ports; the pump signal feedback device is communicated with the cavity to feed back oil pressure information in the cavity; and the compensation valve is connected with the chamber and the pump signal feedback device to control the oil quantity entering the chamber according to the oil pressure information fed back by the pump signal feedback device. According to the load-sensitive multiway valve provided by the embodiment of the invention, the valve body adopts a symmetrical distribution structure, so that the valve is smaller in volume, lower in pressure loss, energy-saving, sensitive in reaction and high in universality under the condition of ensuring flow.
Description
Technical Field
The invention relates to the technical field of hydraulic machinery, in particular to a load-sensitive multi-way valve and engineering machinery with the same.
Background
At present, in heavy equipment such as various engineering machinery, walking machinery and the like, a hydraulic transmission technology is widely applied, a hydraulic multi-way valve set, particularly a load-sensitive multi-way valve set is widely applied to various heavy equipment, the universality is strong, the hydraulic multi-way valve set can control the running speed and the running direction of various actuating mechanisms such as an oil cylinder, a motor and the like, has good precise control and inching characteristics, and the load-sensitive multi-way valve basically can meet the characteristics of energy conservation, precise and stable operation, multi-actuating mechanism compound action and the like of a hydraulic system, but along with the improvement of the requirements on the hydraulic control system, the existing load-sensitive multi-way valve still has the defects in the aspects of mechanical control accuracy, energy consumption conservation and structural rationality, the pressure loss is large, the universality is not high, and the problem to be solved.
The utility model aims at solving the problems existing in the prior art, and provides a load-sensitive multiway valve with better performance, wherein the valve body is designed into a symmetrical distributed structure, the axial dimension can be fully utilized, the valve is smaller in volume and lower in pressure loss on the premise of ensuring enough flow, a plurality of expansion modules are arranged, the selection and the application of customers are facilitated, and the valve has strong universality.
Disclosure of Invention
In view of this, the present invention provides a load-sensitive multiway valve.
The invention also provides engineering machinery with the load-sensitive multiway valve.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to an embodiment of the first aspect of the present invention, a load-sensitive multiway valve comprises: an oil tank; the valve body is internally provided with a cavity communicated with the oil tank, the valve body is provided with an oil inlet, a feedback oil port, an oil return port and a working oil port which are communicated with the cavity, and the feedback oil port, the oil return port and the working oil port are respectively two and symmetrically arranged at two sides of the oil inlet; the main valve core is movably arranged in the cavity to switch different oil ports; the pump signal feedback device is communicated with the cavity to feed back oil pressure information in the cavity; and the compensation valve is connected with the cavity and the pump signal feedback device to control the oil quantity entering the cavity according to the oil pressure information fed back by the pump signal feedback device.
Further, the chamber extends in the axial direction of the valve body, and the feedback port, the oil return port, and the working port are respectively formed as grooves provided on the inner wall surface of the chamber.
Further, the oil inlet is arranged in the middle of the valve body, and the feedback oil port, the oil return port and the working oil port are sequentially and symmetrically arranged on two sides of the oil inlet from outside to inside along the axial direction of the cavity.
Further, the oil tank is respectively with two through first oil circuit and second oil circuit feed back the hydraulic fluid port intercommunication, first oil circuit with be equipped with the intercommunication between the second oil circuit first oil circuit with the third oil circuit of second oil circuit, the sensitive multiple unit valve of load still includes: and the feedback signal shuttle valve is arranged on the third oil path and is connected with the pump signal feedback device and the compensation valve so as to control the oil pressure entering different feedback oil ports according to the oil pressure signals fed back by the pump signal feedback device.
Further, an installation cavity is formed in the valve body, and the feedback signal shuttle valve and the compensation valve are respectively installed in the installation cavity.
Further, the installation cavity is formed in a columnar shape, and the feedback signal shuttle valve and the compensation valve are coaxially arranged in the installation cavity.
Further, the mounting cavity is disposed parallel to the chamber.
Further, the compensation valve includes: the compensating valve core is arranged in the mounting cavity, the inner wall surface of the mounting cavity is provided with spring cavity grooves, oil outlet grooves and high-pressure oil grooves which are axially and alternately distributed along the mounting cavity, the spring cavity grooves are connected with the feedback oil port, and the oil outlet grooves are respectively connected with the oil inlet and the high-pressure oil groove; and the compensation spring is arranged in the mounting cavity and is positioned between the feedback signal shuttle valve and the compensation valve core, and two ends of the compensation spring are respectively abutted against the feedback signal shuttle valve and the compensation valve core.
Further, the load-sensitive multiway valve further comprises:
the first overflow valve and the second overflow valve are respectively arranged on the first oil path and the second oil path.
The working machine according to an embodiment of the second aspect of the present invention comprises a load-sensitive multiway valve according to the above-described embodiments.
The technical scheme of the invention has the following beneficial effects:
according to the load-sensitive multiway valve disclosed by the embodiment of the invention, through reasonable design of the load-sensitive multiway valve, the valve body adopts a symmetrical distribution structure, so that the volume of the valve is smaller, the pressure loss is lower, the energy consumption is saved, the compensation effect of the valve group is improved through arranging the feedback signal shuttle valve and the compensation valve, the stability of the flow of the valve body is ensured, the sensitivity is high, the reaction is fast, the valve is provided with a plurality of expansion modules, the selection and the application are convenient, the universality is very strong, and the valve is simple in structure and easy to realize.
Drawings
FIG. 1 is a schematic diagram of a system control of a load-sensitive multiway valve according to an embodiment of the invention;
FIG. 2 is a cross-sectional view of a load-sensitive multiway valve according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a load-sensitive multiway valve according to an embodiment of the present invention, wherein the main spool is in neutral position;
FIG. 4 is a schematic diagram of the structure of the main spool of the load-sensitive multiway valve of the present invention on the left side;
fig. 5 is a schematic diagram of the structure of the main spool of the load-sensitive multiway valve according to an embodiment of the invention on the right side.
Reference numerals:
load sensitive multiplex valve 100;
an oil tank 10; a first oil passage 11; a second oil passage 12; a third oil passage 13;
a valve body 20; a chamber 21; an oil inlet 22; a feedback oil port 23;
an oil return port 24; a working oil port 25; a mounting cavity 26;
a main spool 30; a main oil passage 31; a damping hole 32; an oil drain hole 33; a pressure taking hole 34;
pump signal feedback means 40;
a compensation valve 50; a compensating spool 51; a compensation spring 52;
a spring cavity groove 53; an oil outlet groove 54; a high-pressure oil groove 55;
a feedback signal shuttle valve 60;
a first relief valve 70; a second relief valve 71;
a variable displacement pump 80; an oil cylinder 81; a balancing valve 82; port relief valve 83.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
A load sensitive multiway valve 100 according to an embodiment of the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 5, the load sensitive multiplex valve 100 according to the embodiment of the invention includes a tank 10, a valve body 20, a main spool 30, a pump signal feedback device 40, and a compensation valve 50.
Specifically, a chamber 21 communicating with the oil tank 10 is defined in the valve body 20, the valve body 20 is provided with an oil inlet 22, a feedback oil port 23, an oil return port 24 and a working oil port 25 which are communicated with the chamber 21, the feedback oil port 23, the oil return port 24 and the working oil port 25 are respectively two and symmetrically arranged at two sides of the oil inlet 22, the main valve core 30 is movably arranged in the chamber 21 to switch different oil ports, the pump signal feedback device 40 is communicated with the chamber 21 to feed back oil pressure information in the chamber 21, and the compensation valve 50 is connected with the chamber 21 and the pump signal feedback device 40 to control the oil quantity entering the chamber 21 according to the oil pressure information fed back by the pump signal feedback device 40.
That is, the load sensitive multiplex valve 100 is mainly composed of the tank 10, the valve body 20, the main spool 30, the pump signal feedback device 40, and the compensation valve 50. The valve body 20 can be internally provided with a cavity 21 communicated with the oil tank 10, the oil tank 10 and the cavity 21 can be communicated through an oil way, hydraulic oil in the cavity 21 can flow into the oil tank 10 through the oil way, the cavity 21 can extend along the axial direction of the valve body 20, the valve body 20 can be respectively provided with an oil inlet 22, a feedback oil port 23, an oil return port 24 and a working oil port 25 which are communicated with the cavity 21, the feedback oil port 23, the oil return port 24 and the working oil port 25 can be respectively two and symmetrically distributed on two sides of the oil inlet 22, the symmetrical distributed structure can fully utilize the axial dimension, the volume of the valve body 20 is smaller on the premise of ensuring enough flow, the pressure loss is reduced, the energy consumption is saved, and the multi-way valve is provided with a plurality of expansion modules, so that the multi-way valve is convenient to select and apply in use, has strong universality and increases the application range.
The main valve core 30 is movably arranged in the cavity 21, and different oil ports can be switched by moving the main valve core 30, so that the cavity 21 is disconnected or communicated with an oil way, the cavity 21 on the valve body 20 is matched with the main valve core 30, different main valve cores 30 can be selected according to the difference of the flow of hydraulic oil and the middle position function, so that the requirements of the flow of hydraulic oil and the middle position function are met, the main valve core 30 can be controlled to move in a mechanical and pilot hydraulic oil mode, the flow of hydraulic oil output at an opening of the main valve core 30 can be directly proportional to the displacement of the main valve core 30, return springs can be respectively arranged at two ends of the main valve core 30, and the main valve core 30 can be pushed by the return force generated by the return springs when returning to the middle position, so that the power energy consumption is saved.
The pump signal feedback device 40 can be communicated with the cavity 21 to feed back oil pressure information in the cavity 21, the compensation valve 50 can be respectively connected with the cavity 21 and the pump signal feedback device 40, oil quantity entering the cavity 21 can be controlled according to the oil pressure information fed back by the pump signal feedback device 40, the oil quantity entering the cavity 21 can be regulated through the variable pump 80, the variable pump 80 can be respectively connected with the pump signal feedback device 40 and the compensation valve 50, the pump signal feedback device 40 can enable the hydraulic pressure of a pump port of the variable pump 80 to be always higher than a certain pressure value of a load, the pressure difference between the front and rear of the main valve 30 is approximately unchanged by the compensation valve 50, the oil pressure information in the cavity 21 can be fed back to the variable pump 80 through the pump signal feedback device 40, and the oil quantity entering the cavity 21 through the compensation valve 50 can be regulated according to the oil pressure information, so that the stability of the oil quantity of the hydraulic oil in the cavity 21 is guaranteed, the oil quantity in the cavity 21 can be regulated in time when the load is changed, and the multi-way valve is flexible and stable when in use.
Therefore, according to the load-sensitive multiway valve 100 of the embodiment of the invention, through reasonable design, the valve body 20 adopts a symmetrical distribution structure, so that the volume of the valve body 20 is smaller, the pressure loss is lower, the energy consumption is reduced, the compensation effect of the valve group is improved, the stability of the hydraulic oil flow in the valve body 20 is ensured, the multiway valve has high sensitivity and quick response when the load changes, and the multiway valve is provided with a plurality of expansion modules, so that the multiway valve is convenient to select and apply, has strong universality, and is simple in structure and easy to realize.
According to an embodiment of the present invention, the chamber 21 may extend in the axial direction of the valve body 20, the chamber 21 is matched with the main valve core 30 so as to better cooperate, so that hydraulic oil in the chamber 21 can smoothly flow out, or so that hydraulic oil can smoothly flow into the chamber 21, so that the hydraulic oil flow in the chamber 21 can be timely and stably regulated according to the load, thereby ensuring the flexibility and stability of the multiway valve, saving energy consumption, the feedback oil port 23, the oil return port 24 and the working oil port 25 may be respectively formed as grooves provided on the inner wall surface of the chamber 21, the grooves may be annular extending along the circumferential direction of the chamber 21, and the specific size may be reasonably selected according to practical needs.
In some embodiments of the present invention, the oil inlet 22 may be disposed in the middle of the valve body 20, and the feedback oil port 23, the oil return port 24 and the working oil port 25 may be sequentially and symmetrically disposed on two sides of the oil inlet 22 from outside to inside along the axial direction of the chamber 21, so as to facilitate arrangement of the oil paths in the multiway valve, make full use of axial dimensions, make the volume of the valve body 20 smaller, reduce pressure loss, and save energy consumption on the premise of ensuring sufficient flow, and make the multiway valve have numerous expansion modules, so that the multiway valve is convenient for selection and application, and increases versatility.
In other embodiments of the present invention, the oil tank 10 may be respectively communicated with the two feedback ports 23 on both sides of the oil inlet 22 through the first oil passage 11 and the second oil passage 12, the hydraulic oil in the chamber 21 may flow out from the feedback ports 23 and flow into the oil tank 10 through the first oil passage 11 and the second oil passage 12, and a third oil passage 13 communicating the first oil passage 11 and the second oil passage 12 may be provided between the first oil passage 11 and the second oil passage 12. The load sensitive multiplex valve 100 may further include a feedback signal shuttle valve 60, the feedback signal shuttle valve 60 may be disposed on the third oil path 13, the feedback signal shuttle valve 60 may be connected to the pump signal feedback device 40 and the compensation valve 50, respectively, and the two feedback oil ports 23 may feed back the oil pressure information in the chamber 21 to the feedback signal shuttle valve 60, respectively.
The feedback signal shuttle valve 60 can select the feedback oil port 23 with higher oil pressure and feed back the high oil pressure information at the oil port to the pump signal feedback device 40 and the compensation valve 50 respectively, so that the oil pressure information in the chamber 21 can be fed back to the pump signal feedback device 40 and the compensation valve 50 through the feedback signal shuttle valve 60, the pump signal feedback device 40 can feed back the high oil pressure information to the variable pump 80, the variable pump 80 can adjust the oil quantity entering the chamber 21 through the compensation valve 50, and the oil pressure entering different feedback oil ports can be controlled according to the oil pressure signals fed back by the pump signal feedback device 40. The oil pressure in the chamber 21 can be fed back more sensitively through the feedback signal shuttle valve 60, so that the flow of hydraulic oil entering the chamber 21 can be adjusted timely, the stability of the multi-way valve is ensured, and the energy consumption is saved.
In one embodiment of the present invention, a mounting cavity 26 may be provided in the valve body 20, the feedback signal shuttle valve 60 and the compensation valve 50 may be respectively mounted in the mounting cavity 26, the mounting cavity 26 should be matched with the feedback signal shuttle valve 60 and the compensation valve 50, and the mounting cavity 26 may be located at the lower portion of the cavity 21, so as to facilitate arrangement and installation of the multi-way valve oil path.
In other embodiments of the present invention, the installation cavity 26 may be formed in a column shape, the feedback signal shuttle valve 60 and the compensation valve 50 may be coaxially disposed in the installation cavity 26, the feedback signal shuttle valve 60 may be positioned at the left side of the compensation valve 50, and the feedback signal shuttle valve 60 may be capable of rapidly and timely acquiring oil pressure information in the cavity 21 and timely and effectively feeding back to the compensation valve 50 and the pump signal feedback device 40 so as to timely adjust the flow rate of hydraulic oil entering the cavity 21.
In another embodiment of the present invention, the installation cavity 26 and the chamber 21 may be disposed in parallel, and the installation cavity 26 may extend along the axial direction of the valve body 20, so that the structural arrangement of the multiway valve is more reasonable, and the volume is reduced.
According to some embodiments of the present invention, the compensating valve 50 may include a compensating valve core 51 and a compensating spring 52, the compensating valve core 51 may be disposed in the installation cavity 26, the inner wall surface of the installation cavity 26 may be respectively provided with a spring cavity groove 53, an oil outlet groove 54 and a high pressure oil groove 55, the spring cavity groove 53, the oil outlet groove 54 and the high pressure oil groove 55 may be respectively and sequentially spaced from left to right along the axial direction of the installation cavity 26, the spacing distance is reasonably selected, the spring cavity groove 53 may be connected with the feedback oil port 23, and the oil outlet groove 54 may be respectively connected with the oil inlet 22 and the high pressure oil groove 55; the compensation spring 52 may be disposed in the installation cavity 26 and located between the feedback signal shuttle valve 60 and the compensation valve core 51, that is, the feedback signal shuttle valve 60, the compensation spring 52 and the compensation valve core 51 are sequentially installed in the installation cavity 26 from left to right, the plug may be installed on the right side of the compensation valve core 51, and two ends of the compensation spring 52 may respectively stop against the feedback signal shuttle valve 60 and the compensation valve core 51.
When the main valve core 30 is in the middle position, the symmetrically distributed oil return ports 24 in the valve body 20 can be respectively connected with the feedback oil ports 23, when the main valve core 30 is subjected to the action of pilot force and moves to one side, the working oil port 25 on one side is communicated with the oil inlet 22, the working oil port 25 is also connected with the feedback oil port 23 on the same side through the main valve core 30, at the moment, the pressure oil of the working oil port 25 is fed back to the feedback signal shuttle valve 60 coaxially arranged with the compensating valve core 51 through the feedback oil port 23 on the same side, the feedback signal shuttle valve 60 is fed back to the spring cavity groove 53, and the working oil port 25 on the other side is communicated with the oil return port 24, so that the return oil of the executing mechanism quickly flows back into the oil tank 10.
When the high-pressure oil groove 55 is filled with pressure oil and the main valve core 30 is in the middle position, the compensating valve core 51 compresses the compensating spring 52, and at this time, the compensating valve core 51 is close to the leftmost side, so that the connection between the oil port of the high-pressure oil groove 55 and the oil outlet groove 54 of the compensating valve core 51 can be cut off, the leakage and the energy consumption of the pressure oil can be reduced, and the energy-saving effect is achieved.
When the main valve core 30 moves, hydraulic oil can flow out from the working oil port 25, at this time, the compensating valve core 51 can stay at a pressure balance position according to the load pressure of the spring cavity groove 53, and the compensating valve core 51 can consume redundant pressure and energy.
The working oil ports 25 can be respectively connected with the oil cylinders 81, when the load pressure suddenly increases in the movement process of the oil cylinders 81, the feedback signal shuttle valve 60 can select high oil pressure information and feed the high oil pressure information back to the spring cavity groove 53, at the moment, one side of the compensation valve core 51, which is close to the spring cavity groove 53, can receive a pressure signal fed back to the spring cavity groove 53 by the feedback signal shuttle valve 60, and push the compensation valve core 51 to the rightmost side, so that the compensation valve core 51 forms a one-way valve function, the connection between the oil port of the high-pressure oil groove 55 and the oil outlet groove 54 of the compensation valve core 51 is cut off, pump side pressure oil of the variable pump 80 is kept stable, and a certain protection effect is achieved for the variable pump 80 and a hydraulic system.
In some embodiments of the present invention, a main valve core 30 may be installed in the valve body 20, two main oil channels 31, two damping holes 32, two oil drain holes 33, and two pressure taking holes 34 may be respectively provided on the main valve core 30, and the main oil channels 31, the damping holes 32, the oil drain holes 33, and the pressure taking holes 34 may be respectively symmetrically distributed on two sides of the middle of the valve body 20.
As shown in fig. 3, when the main valve core 30 is in the middle position, the oil in the left feedback oil port 23 can pass through the left damping hole 32 and then pass through the left oil drain hole 33 to drain the pressure oil to the left oil return port 24; the oil in the feedback oil port 23 on the right can pass through the damping hole 32 on the right and then pass through the oil drain hole 33 on the right to drain the pressure oil to the oil return port 24 on the right.
As shown in fig. 4, when the main valve element 30 moves to the left, the left working oil port 25 is a low-pressure oil return cavity, and can be connected with the left oil return port 24 through the main valve element 30; the working oil port 25 on the right side is a high-pressure oil inlet cavity, and can be connected with the oil inlet 22 through the main valve core 30, a load pressure signal of the working oil port 25 on the right side can enter the feedback signal shuttle valve 60 through the pressure taking hole 34, the main oil duct 31 and the damping hole 32 on the right side and then enter the spring cavity groove 53, at this time, the compensating valve core 51 can stay at a pressure balance position according to the load pressure of the spring cavity groove 53, and the compensating valve core 51 can consume redundant pressure and energy.
As shown in fig. 5, when main spool 30 moves to the right, the same principle of operation as when main spool 30 moves to the left can be connected together with right oil return port 24 by main spool 30; the working oil port 25 on the right side is a low-pressure oil inlet cavity, the working oil port 25 on the left side is a high-pressure oil return cavity, the working oil port 25 on the left side can be connected with the oil inlet 22 through the main valve core 30, a load pressure signal of the working oil port 25 on the left side can enter the feedback signal shuttle valve 60 through the pressure taking hole 34 on the left side, the main oil duct 31 and the damping hole 32 and then enter the spring cavity groove 53, at the moment, the compensating valve core 51 can stay at a pressure balance position according to the load pressure of the spring cavity groove 53, and the compensating valve core 51 can consume redundant pressure and energy.
According to some embodiments of the present invention, the load-sensitive multiway valve 100 may further include a first relief valve 70 and a second relief valve 71, the first relief valve 70 and the second relief valve 71 may be provided on the first oil path 11 and the second oil path 12, respectively, the first relief valve 70 and the second relief valve 71 may be provided on the valve body 20, respectively, the first relief valve 70 and the second relief valve 71 may be screw-blocked, and hydraulic oil in the chamber 21 may flow into the tank 10 through the first relief valve 70 and the second relief valve 71, respectively.
In some embodiments of the present invention, the load-sensitive multiplex valve 100 may further include a balance valve 82, and the balance valve 82 may be connected between one port of the oil cylinder 81 and the working port 25, and the relative balance of the pressures on both sides of the balance valve 82 may be adjusted.
In other embodiments of the present invention, the load-sensitive multiway valve 100 may further comprise a port relief valve 83, the port relief valve 83 may be installed inside the valve body 20, and the port relief valve 83 may be replaced with a plug, and the port relief valve 83 may be connected to another oil port of the oil cylinder 81, the balance valve 82, the right working oil port 25, and the right oil return port 24, respectively.
According to the load-sensitive multiway valve 100 disclosed by the embodiment of the invention, through reasonable design of the load-sensitive multiway valve, the valve body 20 adopts a symmetrical distribution structure, the volume of the multiway valve is smaller, the pressure loss is lower, the energy consumption is reduced under the condition of ensuring the flow, the compensation effect of the valve group is improved through arranging the feedback signal shuttle valve 60 and the compensation valve 50, the stability of the flow of hydraulic oil in the cavity 21 of the valve body 20 is ensured, and when the hydraulic pressure in the cavity 21 changes, the multiway valve can respond sensitively and timely, has a plurality of expansion modules, is convenient to select and apply, has strong universality, and has a simple structure and is easy to realize.
The engineering machine according to the embodiment of the invention comprises the load-sensitive multiway valve 100 according to the embodiment of the invention, and the load-sensitive multiway valve 100 according to the embodiment of the invention has the technical effects, so that the engineering machine according to the embodiment of the invention also has the corresponding technical effects, namely the multiway valve has smaller volume, lower pressure loss and reduced energy consumption under the condition of ensuring flow, is sensitive and timely in response, has a plurality of expansion modules, is convenient to select and apply, and has strong universality.
Other structures and operations of the work machine according to embodiments of the present invention will be understood and readily implemented by those skilled in the art, and thus will not be described in detail.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (7)
1. A load-sensitive multiway valve, comprising:
an oil tank;
the valve body is internally provided with a cavity communicated with the oil tank, the valve body is provided with an oil inlet, a feedback oil port, an oil return port and a working oil port which are communicated with the cavity, and the feedback oil port, the oil return port and the working oil port are respectively two and symmetrically arranged at two sides of the oil inlet;
the main valve core is movably arranged in the cavity to switch different oil ports;
the pump signal feedback device is communicated with the cavity to feed back oil pressure information in the cavity;
the compensation valve is connected with the cavity and the pump signal feedback device to control the oil quantity entering the cavity according to the oil pressure information fed back by the pump signal feedback device;
the cavity extends along the axial direction of the valve body, and the feedback oil port, the oil return port and the working oil port are respectively formed into grooves formed on the inner wall surface of the cavity;
the oil inlet is arranged in the middle of the valve body, and the feedback oil port, the oil return port and the working oil port are sequentially and symmetrically arranged at two sides of the oil inlet from outside to inside along the axial direction of the cavity;
the oil tank is through first oil circuit and second oil circuit respectively with two the feed back hydraulic fluid port intercommunication, first oil circuit with be equipped with the intercommunication between the second oil circuit first oil circuit with the third oil circuit of second oil circuit, the sensitive multiple unit valve of load still includes:
and the feedback signal shuttle valve is arranged on the third oil path and is connected with the pump signal feedback device and the compensation valve so as to control the oil pressure entering different feedback oil ports according to the oil pressure signals fed back by the pump signal feedback device.
2. The load sensitive multiway valve of claim 1, wherein a mounting cavity is provided in the valve body, and the feedback signal shuttle valve and the compensation valve are mounted in the mounting cavity, respectively.
3. The load sensitive multiway valve of claim 2, wherein the mounting cavity is formed as a cylinder, and the feedback signal shuttle valve and the compensating valve are coaxially disposed within the mounting cavity.
4. A load sensitive multiway valve according to claim 3, wherein the mounting cavity is arranged parallel to the chamber.
5. The load sensitive multiway valve of claim 4, wherein the compensation valve comprises:
the compensating valve core is arranged in the mounting cavity, the inner wall surface of the mounting cavity is provided with spring cavity grooves, oil outlet grooves and high-pressure oil grooves which are axially and alternately distributed along the mounting cavity, the spring cavity grooves are connected with the feedback oil port, and the oil outlet grooves are respectively connected with the oil inlet and the high-pressure oil groove;
and the compensation spring is arranged in the mounting cavity and is positioned between the feedback signal shuttle valve and the compensation valve core, and two ends of the compensation spring are respectively abutted against the feedback signal shuttle valve and the compensation valve core.
6. The load sensitive multiway valve of claim 5, further comprising:
the first overflow valve and the second overflow valve are respectively arranged on the first oil path and the second oil path.
7. A construction machine comprising a load sensitive multiplex valve according to any one of claims 1-6.
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| CN201711121123.0A CN107725523B (en) | 2017-11-14 | 2017-11-14 | Load-sensitive multiway valve and engineering machinery with same |
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| CN201711121123.0A CN107725523B (en) | 2017-11-14 | 2017-11-14 | Load-sensitive multiway valve and engineering machinery with same |
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| CN107725523B true CN107725523B (en) | 2023-12-15 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018204642A1 (en) * | 2018-03-27 | 2019-10-02 | Robert Bosch Gmbh | Valve assembly with load holding in the spool valve |
| CN110848190A (en) * | 2019-09-25 | 2020-02-28 | 张家口凯航液压科技有限公司 | Integrated load sensitive flow divider valve |
| CN115405576A (en) * | 2022-10-31 | 2022-11-29 | 索特传动设备有限公司 | Variable differential pressure valve, load sensitive hydraulic system and engineering machinery |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201786797U (en) * | 2010-09-30 | 2011-04-06 | 李金海 | Excavator load sensitive pressure compensation multi-way valve |
| CN102444636A (en) * | 2010-09-30 | 2012-05-09 | 李金海 | Load sensitive pressure compensation multiway valve for excavator |
| CN203716836U (en) * | 2013-12-31 | 2014-07-16 | 山河智能装备股份有限公司 | Impact pressure remote-control hydraulic circuit of jackdrill |
| CN103925254A (en) * | 2014-04-24 | 2014-07-16 | 徐工集团工程机械股份有限公司 | Pressure compensation valve and load sensory system |
| CN104047931A (en) * | 2014-06-23 | 2014-09-17 | 柳州柳工液压件有限公司 | Three-way pressure compensator assembly |
| CN204164076U (en) * | 2014-10-28 | 2015-02-18 | 徐工集团工程机械股份有限公司 | A kind of load-sensitive duty valve and multi-way valve, hydraulic system, mini-excavator |
| CN204344992U (en) * | 2014-10-17 | 2015-05-20 | 徐工集团工程机械股份有限公司 | Load sensing multi-way valve, load sensitive system and excavator |
| CN204553385U (en) * | 2015-02-11 | 2015-08-12 | 徐工集团工程机械股份有限公司 | Valve core of multiway valve, load sensing multi-way valve and excavator |
| CN105221506A (en) * | 2015-09-18 | 2016-01-06 | 徐州工业职业技术学院 | A kind of load-sensitive valve and load-sensitive hydraulic system |
| CN105570491A (en) * | 2014-10-17 | 2016-05-11 | 徐工集团工程机械股份有限公司 | Load-sensitive multiway valve, load-sensitive system and excavator |
| CN105626615A (en) * | 2016-02-29 | 2016-06-01 | 浙江高宇液压机电有限公司 | Steering feedback type flow amplification valve |
| CN105840572A (en) * | 2015-01-16 | 2016-08-10 | 徐工集团工程机械股份有限公司 | Reversing link for load-sensitive multi-way valve, load-sensitive multi-way valve and engineering machinery hydraulic system |
| CN105840571A (en) * | 2015-01-16 | 2016-08-10 | 徐工集团工程机械股份有限公司 | Valve body of load-sensitive multi-way valve reversing link and load-sensitive multi-way valve reversing link |
| CN207437487U (en) * | 2017-11-14 | 2018-06-01 | 江苏恒立液压科技有限公司 | Load sensing multi-way valve and with its engineering machinery |
-
2017
- 2017-11-14 CN CN201711121123.0A patent/CN107725523B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201786797U (en) * | 2010-09-30 | 2011-04-06 | 李金海 | Excavator load sensitive pressure compensation multi-way valve |
| CN102444636A (en) * | 2010-09-30 | 2012-05-09 | 李金海 | Load sensitive pressure compensation multiway valve for excavator |
| CN203716836U (en) * | 2013-12-31 | 2014-07-16 | 山河智能装备股份有限公司 | Impact pressure remote-control hydraulic circuit of jackdrill |
| CN103925254A (en) * | 2014-04-24 | 2014-07-16 | 徐工集团工程机械股份有限公司 | Pressure compensation valve and load sensory system |
| CN104047931A (en) * | 2014-06-23 | 2014-09-17 | 柳州柳工液压件有限公司 | Three-way pressure compensator assembly |
| CN204344992U (en) * | 2014-10-17 | 2015-05-20 | 徐工集团工程机械股份有限公司 | Load sensing multi-way valve, load sensitive system and excavator |
| CN105570491A (en) * | 2014-10-17 | 2016-05-11 | 徐工集团工程机械股份有限公司 | Load-sensitive multiway valve, load-sensitive system and excavator |
| CN204164076U (en) * | 2014-10-28 | 2015-02-18 | 徐工集团工程机械股份有限公司 | A kind of load-sensitive duty valve and multi-way valve, hydraulic system, mini-excavator |
| CN105840572A (en) * | 2015-01-16 | 2016-08-10 | 徐工集团工程机械股份有限公司 | Reversing link for load-sensitive multi-way valve, load-sensitive multi-way valve and engineering machinery hydraulic system |
| CN105840571A (en) * | 2015-01-16 | 2016-08-10 | 徐工集团工程机械股份有限公司 | Valve body of load-sensitive multi-way valve reversing link and load-sensitive multi-way valve reversing link |
| CN204553385U (en) * | 2015-02-11 | 2015-08-12 | 徐工集团工程机械股份有限公司 | Valve core of multiway valve, load sensing multi-way valve and excavator |
| CN105221506A (en) * | 2015-09-18 | 2016-01-06 | 徐州工业职业技术学院 | A kind of load-sensitive valve and load-sensitive hydraulic system |
| CN105626615A (en) * | 2016-02-29 | 2016-06-01 | 浙江高宇液压机电有限公司 | Steering feedback type flow amplification valve |
| CN207437487U (en) * | 2017-11-14 | 2018-06-01 | 江苏恒立液压科技有限公司 | Load sensing multi-way valve and with its engineering machinery |
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| CN107725523A (en) | 2018-02-23 |
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