A load-sensitive multi-way valve with double-pump combined flow control and priority function

Abstract

The application discloses a load-sensitive multi-way valve with double-pump confluence control and priority function, characterized in that the load-sensitive multi-way valve comprises an oil inlet assembly, a plurality of working assemblies, a confluence assembly, a tail assembly and a connecting piece, the connecting piece is used for mounting the oil inlet assembly, the plurality of working assemblies, the confluence assembly and the tail assembly together, the working assemblies have priority levels, the working assembly with a high priority level is arranged in front of the working assembly with a low priority level, and the problem that the working assembly with the high priority level can only be supplied with oil from a single side when the priority level is realized through the confluence assembly to solve the mixed oil circuit in series-parallel connection is solved, the load-sensitive multi-way valve has a simple structure and strong processing process, and the number of the working assemblies can be set according to actual requirements of a host machine.

Description

TECHNICAL FIELD

[0001] The present application belongs to load sensitive multi-way valve, and particularly relates to a load sensitive multi-way valve with double-pump combined flow control and priority function. BACKGROUND

[0002] The slice multi-way valve is widely applied to the engineering machinery and other industries due to its compact structure, good processing technology and strong versatility. The valve rear compensation type load sensitive multi-way valve can also distribute the flow to each actuator in proportion when the main pump flow is less than the required flow of the hydraulic system composite action, and the coordination of each actuator is better compared with other systems. However, the excavator and other engineering machinery have multiple composite actions, and the maximum number of composite actions of the upper vehicle and the lower vehicle is five. When the flow is saturated, the small load flow is too small due to the shunt of the multiple actuator composite actions, and the speed is obviously reduced. In order to solve this problem, the series-parallel oil circuit is introduced to realize the priority, and the working link assembly with priority requirement is placed in front of the working link without priority requirement, so that the system flow is preferentially distributed to the working link with priority requirement. In this case, the oil entering the multi-way valve can only pass through one inlet, and the above-mentioned technology cannot realize the priority function when multiple priority functions are required and the oil is supplied from both sides of the main valve or double pumps.

[0003] The existing patent with the name of a valve group and multi-way valve for high-low pressure pump series-parallel work, the application number CN201811096001.5, is recorded as follows: the valve group includes a five-position six-way valve body, a back oil bridge body and a one-way valve bridge body fixedly arranged on the left and right sides of the five-position six-way valve body, wherein the first oil inlet P1 and the second oil inlet P2 return to the T1 port and the T2 port to unload when the valve rod is in the middle position; when the valve rod is forwardly reversed by one position, the first oil inlet P1 supplies oil to the actuator alone and the second oil inlet P2 returns to the T1 port to unload; when the valve rod is forwardly reversed by two positions, the second oil inlet P2 and the first oil inlet P1 supply oil to the actuator after the oil inlets are combined in the third oil inlet, which can adapt to the high-low pressure pump series-parallel work, and the double pumps are combined in the light load, and the single pump supplies oil in the heavy load; the technology can be used in the forging machine, the press machine, the injection molding machine or the truck-mounted crane, and is not suitable for the engineering machinery such as the excavator with high composite action requirement; moreover, the technology is only the traditional double-pump combined flow technology, and does not reflect the advantage of the flow priority distribution of the series-parallel mixed oil circuit in the multiple action composite. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a load-sensitive multi-way valve with double-pump confluence control and priority function, which is a piece-type multi-way valve structure and comprises an oil inlet assembly, a plurality of working assemblies, a confluence assembly, a tail assembly and a connecting piece.The oil inlet assembly comprises a center unloading valve and a large-pump oil inlet P1, etc.The working assemblies comprise series priority oil supply channels and parallel oil supply channels.The confluence assembly comprises a main overflow valve, an Ls overflow valve, a distribution valve, a confluence check valve and a pressure reducing valve, etc.The multi-way valve can reasonably arrange the working assemblies according to the priority requirements of the system and solve the problem that the series-parallel mixed oil circuit can only be supplied with oil from one side through the confluence assembly.

[0005] Load sensitivity: a technology that matches the pressure and flow required by the load with the pressure and flow of the pump through load feedback technology to eliminate energy loss and reduce energy consumption so as to maximize the system efficiency.

[0006] Double-pump confluence: two hydraulic systems A and B have their own main pumps, and when system A does not need to be supplied with oil, both main pumps supply oil to system B.

[0007] Series-parallel mixed oil circuit: the oil inlet cavity of each working assembly is communicated with the center oil passage of the previous working assembly, i.e., the oil inlet circuit is in series, and the oil return cavity of each working assembly is directly communicated with the total oil return cavity, i.e., the oil return circuit is in parallel, so it is called a series-parallel mixed oil circuit.

[0008] To achieve the above object, the technical scheme adopted by the present application is as follows: a load-sensitive multi-way valve with double-pump confluence control and priority function, which is a piece-type multi-way valve structure and comprises an oil inlet assembly, a plurality of working assemblies, a confluence assembly, a tail assembly and a connecting piece.The connecting piece connects the oil inlet assembly, the plurality of working assemblies, the confluence assembly and the tail assembly together, the working assemblies have priority levels, and the working assemblies with high priority levels are placed in front of the working assemblies with low priority levels.

[0009] Further, the connecting piece comprises connecting wires and connecting nuts, the plurality of working assemblies comprise working assembly A, working assembly B, working assembly C, working assembly D and working assembly E, and the oil inlet assembly, working assembly A, working assembly B, working assembly C, working assembly D, the confluence assembly, working assembly E and the tail assembly are connected together through the corresponding functional oil passages arranged inside and are fixed together through the connecting wires and the connecting nuts outside.

[0010] Further, the oil inlet subassembly comprises an oil inlet valve body and a neutral unloading valve and a pressure compensation throttle valve installed on the oil inlet valve body, an oil channel is arranged in the oil inlet valve body for communication with the working subassembly A, a large pump oil inlet port P1, a first oil return port T1, a main valve pressure measuring port MP and a feedback port Ls connected with the main pump are further arranged on the oil inlet valve body, the large pump oil inlet port P1, the first oil return port T1, the main valve pressure measuring port MP and the feedback port Ls are communicated with the oil channel inside the oil inlet valve body, the neutral unloading valve and the pressure compensation throttle valve are arranged on the oil channel inside the oil inlet valve body, and a filter screen is arranged on the oil channel inside the oil inlet valve body.

[0011] Further, the working subassembly A, the working subassembly B, the working subassembly C, the working subassembly D and the working subassembly E are working subassemblies with priority, according to the priority, the working subassembly with high priority is placed in front of the working subassembly with low priority, the working subassembly A and the working subassembly D adopt the A-type working subassembly, and the working subassembly B, the working subassembly C and the working subassembly E adopt the B-type working subassembly.

[0012] Further, the A-type working subassembly comprises an A-type working valve body and a valve core, a working check valve and a pilot electromagnetic valve installed on the A-type working valve body, an oil channel is arranged in the A-type working valve body for communication with the oil inlet subassembly, the B-type working valve body and the confluence subassembly, the valve core, the working check valve and the pilot electromagnetic valve are arranged on the oil channel of the A-type working valve body.

[0013] Further, the B-type working subassembly comprises a B-type working valve body and a valve core, a compensator, a working check valve and a pilot electromagnetic valve installed on the A-type working valve body, an oil channel is arranged in the B-type working valve body for communication with the A-type working valve body, the B-type working valve body, the confluence subassembly and the tail subassembly, the valve core, the compensator, the working check valve and the pilot electromagnetic valve are arranged on the oil channel of the A-type working valve body.

[0014] Further, the tail subassembly comprises a tail valve body, an oil channel is arranged in the tail valve body for communication with the working subassembly E, a second oil return port T2 and a third oil return port T3 are further arranged on the tail valve body, and the second oil return port T2 and the third oil return port T3 are communicated with the oil channel inside the tail valve body.

[0015] Further, the confluence subassembly comprises a confluence valve body and a distribution valve, a pressure reducing valve, a pressure compensation throttle valve, a confluence check valve, an overflow valve A, an overflow valve B and an overflow valve C installed on the confluence valve body, an oil channel is arranged in the confluence valve body for communication with the working subassembly D and the working subassembly E, a small pump oil inlet port P2 and a pilot oil inlet port L are further arranged on the confluence valve body, and the small pump oil inlet port P2 and the pilot oil inlet port L are communicated with the oil channel inside the confluence valve body.

[0016] Further, the shunt valve in the combined flow joint valve body is used to control the flow when the working joint assembly E works, and the excess flow is combined with the large pump inlet P1 through the combined flow check valve. When the working joint assembly E does not work, the oil in the small pump inlet P2 is combined with P1 through the combined flow check valve. The pressure reducing valve is an internal pilot oil source, which provides a pilot force. The overflow valve A is used to limit the pressure of the small pump inlet P2. The overflow valve B is used to limit the maximum pressure of the Ls oil way. The pressure compensation throttle valve is used to filter the Ls pressure, so that it is more stable. The overflow valve C is used to limit the P1 pressure.

[0017] The beneficial effects of the present application are:

[0018] (1) By adding the combined flow joint assembly in the series-parallel hybrid load-sensitive multi-way valve, the problem that the traditional series-parallel hybrid oil way can only enter oil from one side inlet when realizing priority control is solved, the application occasions of the series-parallel hybrid oil way are improved, and the difficulty of main valve debugging is reduced.

[0019] (2) By setting the shunt check valve and the combined flow check valve on the combined flow joint assembly, when the working joint assembly E does not work, the double pump oil is supplied to the front working joint through the combined flow check valve, and the energy consumption of the hydraulic system is reduced.

[0020] (3) By setting the overflow valve on the combined flow joint assembly to limit the system pressure of the whole machine, the P1 and P2 are separately provided with the main overflow valve, and the individualized demand of the main machine is met.

[0021] (4) The present application is a sheet type multi-way valve structure, which is simple in structure, strong in processing technology, and can set the number of working joint assemblies according to the actual demand of the main machine. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a three-dimensional structure schematic diagram of the present application;

[0023] Figure 2 is a cross-sectional structure schematic diagram of the present application;

[0024] Figure 3 is an explosion structure schematic diagram of the combined flow joint assembly;

[0025] Figure 4 is a system structure schematic diagram;

[0026] Figure 5 is a working joint assembly cross-sectional structure schematic diagram;

[0027] Figure 6 is Figure 5 is a local structure schematic diagram;

[0028] In the diagram: 1. Inlet assembly; 11. Neutral unloading valve; 12. Pressure-compensated throttle valve; 13. Filter screen; 2. Working assembly A; 21. Port relief valve; 22. Pilot solenoid valve; 3. Working assembly B; 31. Compensator; 4. Working assembly C; 5. Working assembly D; 51. Cavity; 52. Cavity; 53. Valve core; 531. Throttling groove; 54 / 55 - Return port; 56. Cavity; 6. Merging assembly; 61. Merging valve body; 62. Diverter valve core; 63. Pressure reducing valve; 64. Relief valve A; 65. Relief valve B; 66. Pressure-compensated throttle valve; 67. Relief valve C; 68. Merging check valve; 69. Check valve; 7. Working assembly E; 8. Tail assembly; 9. Connecting thread pair; 10. Connecting nut. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0031] like Figures 1-2 As shown, a load-sensitive multi-way valve with dual-pump confluence control and priority function is a plate-type multi-way valve structure, including: an oil inlet assembly 1, a working assembly A2, a working assembly B3, a working assembly C4, a working assembly D5, a confluence assembly 6, a working assembly E7, a tail assembly 8, a pair of connecting threads 9, and a connecting nut 10. The oil inlet assembly 1, working assembly A2, working assembly B3, working assembly C4, working assembly D5, confluence assembly 6, working assembly E7, and tail assembly 8 are connected together through internally provided oil passages with corresponding functions, and are externally fixed together by the connecting threads 9 and the connecting nut 10.

[0032] like Figures 1-2As shown in Figure 4, the oil inlet assembly 1 includes: an oil inlet valve body and a neutral unloading valve 11 and a pressure compensation throttle valve 6612 installed on the oil inlet valve body. The oil inlet valve body is provided with an oil passage for communication with the working assembly A2. The oil inlet valve body is also provided with a large pump inlet P1, a first return oil port T1, a main valve pressure test port MP, and a feedback port Ls connected to the main pump. The large pump inlet P1, the first return oil port T1, the main valve pressure test port MP, and the feedback port Ls are connected to the oil passage inside the oil inlet valve body. The neutral unloading valve 11 and the pressure compensation throttle valve 6612 are arranged on the oil passage inside the oil inlet valve body. A filter screen 13 is provided on the oil passage inside the oil inlet valve body.

[0033] like Figures 1-2 As shown in Figure 4, working assembly A2, working assembly B3, working assembly C4, working assembly D5, and working assembly E7 are working assembly assemblies with priority. The working assembly assemblies with priority functions have valve bodies and valve cores with priority steps, forming a series priority oil supply channel and a parallel oil supply channel. According to the different priorities, the working assembly with higher priority is placed in front of the working assembly with lower priority. Working assembly A2 and working assembly D5 adopt type A working assembly, while working assembly B3, working assembly C4, and working assembly E7 adopt type B working assembly.

[0034] Furthermore, the type A working assembly includes: a type A working valve body and a valve core, a working check valve 69 and a pilot solenoid valve 22 installed on the type A working valve body. The type A working valve body is provided with an oil passage for communicating with the oil inlet assembly 1, the type B working valve body and the confluence assembly 6. The valve core, the working check valve 69 and the pilot solenoid valve 22 are arranged in the oil passage of the type A working valve body.

[0035] Furthermore, the type B working assembly includes: a type B working valve body and a valve core, compensator 31, working check valve 69 and pilot solenoid valve 22 installed on the type A working valve body. The type B working valve body is provided with an oil passage for communicating with the type A working valve body, the type B working valve body, the confluence assembly 6 and the tail assembly 8. The valve core, compensator 31, working check valve 69 and pilot solenoid valve 22 are arranged in the oil passage of the type A working valve body.

[0036] Working assembly A2, working assembly B3, working assembly C4, working assembly D5, and working assembly E7 are all equipped with two port oil ports. Both port oil ports in working assembly A2 and working assembly C4 are equipped with port overflow valves 21; only one port oil port in working assembly B3 and working assembly E7 is equipped with a port overflow valve 21.

[0037] like Figure 5As shown, when the spool is in the neutral position, the oil from the main pump goes to the next working link through the cavity 51, the cavity 56, and the cavity 52. Figure 6 As shown, when the spool is in the neutral position, the oil from the main pump goes to the next working link through the cavity 51, the cavity 56, and the cavity 52.

[0038] As shown in FIGS. 1, 2, 3, 4, the tail link assembly 8 includes a tail link valve body, which is internally provided with an oil passage for communication with the working link assembly E7, and is further provided with a second return port T2 and a third return port T3, which are in communication with the oil passage in the tail link valve body. Figures 1-2 As shown in FIGS. 1, 2, 3, 4, the tail link assembly 8 includes a tail link valve body, which is internally provided with an oil passage for communication with the working link assembly E7, and is further provided with a second return port T2 and a third return port T3, which are in communication with the oil passage in the tail link valve body.

[0039] Figures 1-4 As shown in FIGS. 1, 2, 3, 4, the tail link assembly 8 includes a tail link valve body, which is internally provided with an oil passage for communication with the working link assembly E7, and is further provided with a second return port T2 and a third return port T3, which are in communication with the oil passage in the tail link valve body.

[0040] As shown in FIGS. 1, 2, 3, 4, the tail link assembly 8 includes a tail link valve body, which is internally provided with an oil passage for communication with the working link assembly E7, and is further provided with a second return port T2 and a third return port T3, which are in communication with the oil passage in the tail link valve body. Figure 4 As shown in FIGS. 1, 2, 3, 4, the tail link assembly 8 includes a tail link valve body, which is internally provided with an oil passage for communication with the working link assembly E7, and is further provided with a second return port T2 and a third return port T3, which are in communication with the oil passage in the tail link valve body.

[0041] ​The above merely provides the preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement or improvement made in the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A load-sensitive multi-way valve with dual-pump confluence control and priority function, characterized in that: Includes: oil inlet assembly, several working assembly assemblies, confluence assembly, tail assembly and connectors. The connectors install the oil inlet assembly, several working assembly assemblies, confluence assembly and tail assembly together. The working assembly assemblies have priorities, and according to the different priorities, the working assembly with higher priority is placed in front of the working assembly with lower priority. Several working connection components include: working connection component A, working connection component B, working connection component C, working connection component D, and working connection component E. The oil inlet connection component, working connection component A, working connection component B, working connection component C, working connection component D, confluence connection component, working connection component E, and tail connection component are connected together through corresponding internal oil passages. Work link components A, B, C, D, and E are work link components with priorities. According to their priorities, the work link components with higher priorities are placed in front of the work link components with lower priorities. Work link components A and D are type A work link components, while work link components B, C, and E are type B work link components.

2. The load-sensitive multi-way valve with dual-pump confluence control and priority function according to claim 1, characterized in that: The oil inlet assembly includes an oil inlet valve body and a neutral unloading valve and a pressure compensation throttle valve installed on the oil inlet valve body. The oil inlet valve body has an oil passage for communicating with the working assembly A. The oil inlet valve body also has a large pump inlet P1, a first return port T1, a main valve pressure test port MP, and a feedback port Ls connected to the main pump. The large pump inlet P1, the first return port T1, the main valve pressure test port MP, and the feedback port Ls are connected to the oil passage inside the oil inlet valve body. The neutral unloading valve and the pressure compensation throttle valve are installed on the oil passage inside the oil inlet valve body. A filter screen is installed on the oil passage inside the oil inlet valve body.

3. The load-sensitive multi-way valve with dual-pump confluence control and priority function according to claim 1, characterized in that: The type A working assembly includes: a type A working valve body and a valve core, a working check valve, and a pilot solenoid valve installed on the type A working valve body. The type A working valve body is provided with an oil passage for communicating with the oil inlet assembly, the type B working valve body, and the confluence assembly. The valve core, the working check valve, and the pilot solenoid valve are arranged in the oil passage of the type A working valve body.

4. A load-sensitive multi-way valve with dual-pump confluence control and priority function according to claim 1, characterized in that: The type B working assembly includes: a type B working valve body and a valve core, compensator, working check valve and pilot solenoid valve installed on the type A working valve body. The type B working valve body is provided with an oil passage for connecting with the type A working valve body, the type B working valve body, the confluence assembly and the tail assembly. The valve core, compensator, working check valve and pilot solenoid valve are arranged in the oil passage of the type A working valve body.

5. A load-sensitive multi-way valve with dual-pump confluence control and priority function according to claim 1, characterized in that: The tail assembly includes: a tail valve body, which has an oil passage inside for connecting with the working assembly E, and a second oil return port T2 and a third oil return port T3 on the tail valve body, which are connected to the oil passage inside the tail valve body.

6. A load-sensitive multi-way valve with dual-pump confluence control and priority function according to claim 2, characterized in that: The combined flow assembly includes: a combined flow valve body and a diverter valve, a pressure reducing valve, a pressure compensating throttle valve, a combined flow check valve, a relief valve A, a relief valve B, and a relief valve C installed on the combined flow valve body. The combined flow valve body has an internal oil passage for communication with the working assembly D and the working assembly E. The combined flow valve body also has a small pump inlet P2 and a pilot inlet L, which are connected to the oil passage inside the combined flow valve body.

7. A load-sensitive multi-way valve with dual-pump confluence control and priority function according to claim 6, characterized in that: The diverter valve in the confluence valve body controls the flow rate when the working assembly E is working. Excess flow is combined with the main pump inlet P1 through the confluence check valve. When the working assembly E is not in operation, all the oil at the small pump inlet P2 is combined with P1 through the confluence check valve. The pressure reducing valve is an internal pilot oil source that provides pilot force. The relief valve A is used to limit the pressure at the small pump inlet P2. The relief valve B is used to limit the maximum pressure in the Ls oil circuit. The pressure compensation throttle valve is used to filter the Ls pressure to make it more stable. The relief valve C is used to limit the P1 pressure.

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