Double-pump confluence load-sensitive valve group and multi-way valve for engineering machinery

Abstract

The invention discloses a dual-pump confluence load-sensitive valve group and a multi-way valve for engineering machinery, and provides a modular integrated design, the valve group comprises an oil inlet valve plate I, a confluence valve plate, a reversing valve plate and an oil inlet valve plate II, the oil inlet valve plate I is integrated with a priority valve core and an overflow valve, and oil return through a short path of the confluence valve plate during neutral-position unloading of an oil pump I is realized; a three-way flow adjusting valve is arranged in the second oil inlet valve plate and is in linkage with the shuttle valve through an LS2 / LS3 channel, and the oil supply state and the unloading state of the second oil pump are dynamically switched. The converging valve plate controls double-pump converging logic through the reversing valve rod, P1 and P2 converge to a working port A through a logic one-way valve under the lifting working condition, meanwhile, an LS2 channel feeds back load pressure to trigger a three-way valve to be closed and unloaded, and rapid large-flow response is achieved. The unloading oil way structure is optimized, the pressure loss path is shortened, the flow requirement is accurately matched in combination with load sensitive control, the meso-position unloading energy consumption is reduced, the problems of energy waste and response lag of a traditional system are solved, the energy efficiency of equipment is remarkably improved, and the service life of the equipment is remarkably prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-way valves, and particularly to a load-sensitive valve group and a multi-way valve for the confluence of double pumps in construction machinery. Background Art

[0002] Traditional open-center multi-way valve groups have long suffered from problems of redundant structural design and energy waste in hydraulic systems. Their unloading oil circuits usually adopt a single long-path oil return design. For example, during neutral unloading, the oil needs to flow through multiple valve plates and complex oil channels in sequence, resulting in a significant increase in pressure loss. Especially when the double pumps (P1, P2) unload simultaneously, the energy loss is further aggravated. In addition, in order to meet the requirements of different working conditions, traditional valve groups often adopt a configuration of multiple spools in parallel or series. For example, a confluence valve group needs to be additionally added for large-flow operations, while an independent adjustment unit is required for small-flow control. This "one-size-fits-all" design not only occupies the installation space of the main engine but also causes a lag in system response due to poor coordination between spools, making it difficult to meet the requirements of construction machinery for quick start-stop and dynamic load switching. According to statistics, the energy loss of such systems during neutral unloading accounts for up to 15%-20% of the total power, seriously restricting the improvement of equipment energy efficiency.

[0003] The flow and pressure control of traditional multi-way valve groups rely on external regulating valves or fixed throttle designs, lacking dynamic adaptability. For example, when the double pumps are confluent, manual or mechanical linkage switching is required, resulting in oil supply delay and flow fluctuation, and unable to accurately match the instantaneous large-flow demand of the lifting working condition. And load-sensitive control is mostly realized through an external pressure compensation valve, which has a slow response speed, low adjustment accuracy, and is prone to pressure oscillation or underload problems. More critically, in order to take into account different actuators (such as steering and lifting), conventional valve groups often adopt a "full-flow through" design, that is, all actions rely on the same main oil circuit, resulting in a large amount of hydraulic energy being dissipated uselessly during small-flow operations, and the system generating heat seriously. These problems not only reduce the reliability of the equipment but also accelerate the wear of seals and spools due to frequent overload and pressure shock, significantly shortening the service life of hydraulic components. Summary of the Invention

[0004] The purpose of the present invention is to provide a load-sensitive valve group and a multi-way valve for the confluence of double pumps in construction machinery, aiming to overcome the defects of the prior art and solve the problems of long unloading path, high energy loss, insufficient dynamic response, and poor compatibility of traditional multi-way valve groups.

[0005] To this end, the present invention proposes a load-sensitive valve group and a multi-way valve for double-pump confluence in construction machinery, including an oil inlet valve plate 1, a confluence valve plate, multiple reversing valve plates, and an oil inlet valve plate 2 connected in sequence; the oil inlet valve plate 1 integrates a priority spool, a main relief valve, and a steering relief valve, and its internal P1 channel is directly connected to the oil return port T of the unloading oil circuit of the confluence valve plate. The oil inlet valve plate 2 is internally provided with a three-way flow regulating valve, and its unloading oil circuit is directly connected to the T1 oil return port through the three-way flow regulating valve; the confluence valve plate is provided with a reversing valve rod, a logic check valve, and an LS2 channel;

[0006] The reversing valve plate is linked with the confluence valve plate to control the confluence or independent oil supply of oil pump 1 and oil pump 2 through the reversing valve rod. During the lifting operation, oil pump 1 and oil pump 2 are confluent to the working port A through the logic check valve; the LS2 channel is linked with the three-way flow regulating valve to achieve load-sensitive control.

[0007] As a preferred technical solution of the present application, the neutral unloading path of oil pump 1 is: P1 oil inlet → priority spool → P1 oil passage of the confluence valve plate → oil return port T.

[0008] As a preferred technical solution of the present application, the oil inlet valve plate 2 is provided with an LS2 channel and an LS3 channel. The shuttle valve is used to select the actuator pressure and transmit it to the spring chamber of the three-way flow regulating valve to dynamically adjust the oil supply and unloading switching of oil pump 2.

[0009] As a preferred technical solution of the present application, a relief valve 1 and a relief valve 2 are respectively installed corresponding to the LS2 channel and the LS3 channel; at the same time, the LS2 channel and the LS3 channel are connected through a shuttle valve.

[0010] As a preferred technical solution of the present application, the unloading oil circuit of the confluence valve plate includes independently provided P1 oil passage and P2 oil passage. During neutral unloading, oil pump 1 and oil pump 2 return oil through the P1 oil passage and the three-way flow regulating valve respectively, and the length of the unloading path is shorter than that of the traditional valve group.

[0011] As a preferred technical solution of the present application, the logic check valve connects the P1 oil passage and the working port A during the lifting operation. At the same time, the LS2 channel feeds back the load pressure to the three-way flow regulating valve, triggering oil pump 2 to stop unloading and confluent with oil pump 1 for oil supply.

[0012] As a preferred technical solution of the present application, the confluence valve plate is provided with an electromagnetic valve to control the opening and closing of the logic check valve. During the lowering operation, the electromagnetic valve is opened to connect the working port A to the oil return port T. At the same time, oil pump 1 unloads through the P1 oil passage, and oil pump 2 unloads through the three-way flow regulating valve.

[0013] As a preferred technical solution of the present application, the confluence valve plate is provided with an electromagnetic valve oil passage, and the electromagnetic valve oil passage and the oil return port T are controlled to be opened and closed by the reversing valve rod.

[0014] As a preferred technical solution of the present application, when the reversing valve stem is in the lifting position, the solenoid valve is energized and opened, the oil passages of oil pump one and oil pump two are merged through the logic check valve to the working port A, and the pressure of the LS2 passage drives the three-way flow regulating valve to close and unload.

[0015] As a preferred technical solution of the present application, when the reversing valve stem is in the lowering position, the solenoid valve is energized and opened, the working port A is communicated with the oil return port T, oil pump one is unloaded through the reversing valve plate, and oil pump two is unloaded through the three-way flow regulating valve.

[0016] The load sensing valve group and the multi-way valve for double pump merging of the present invention for construction machinery have the following beneficial effects:

[0017] 1) High efficiency and energy saving: Optimize the design of the unloading oil circuit, shorten the oil circuit path, significantly reduce the pressure loss, and the energy consumption of the neutral unloading is reduced from 15%-20% of the traditional system to 5%-8% of the total power, reducing the dissipation of ineffective energy.

[0018] 2) Fast dynamic response: Integrate the three-way flow regulating valve and the load sensing control, and through the LS passage, the load pressure is fed back in real time to achieve dynamic flow matching, accurately meet the instantaneous large flow demand of the lifting and lowering conditions, and avoid oil supply delay and fluctuation.

[0019] 3) Compact structure: Modularly integrate the inlet valve plate, the merging valve plate and the reversing valve plate, separate the large / small flow oil supply paths, reduce redundant spools and oil passages, save the installation space of the main engine, and reduce the manufacturing cost.

[0020] 4) Intelligent cooperation of double pumps: Control the double pump merging logic through the reversing valve stem and the logic check valve, quickly merge and supply oil in the lifting condition, and supply oil independently in the non-merging condition, taking into account the large flow operation and the small flow fine control requirements.

[0021] 5) Improvement of system reliability: The load sensing control reduces the pressure oscillation and impact, combined with the short path unloading to reduce the system heat generation, delay the wear of the seals and spools, and extend the service life of the hydraulic components.

[0022] 6) Multi-functional adaptability: The inlet valve plate one integrates the steering priority function, and the inlet valve plate two supports the dynamic unloading switching, meeting the complex working condition requirements of multiple actuators (steering, lifting, lowering) of construction machinery, and significantly enhancing the operation stability.

[0023] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The following will refer to the drawings to make a further detailed description of the present application. Description of the Drawings

[0024] The accompanying drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0025] Figures 1a to 1c are the front view, left side view and right side view of the load sensing valve group and multi-way valve for double pump confluence of construction machinery according to the present invention;

[0026] Figure 2 is the schematic diagram of the load sensing valve group and multi-way valve for double pump confluence of construction machinery according to the present invention;

[0027] Figure 3 is the structural schematic diagram of the first oil inlet valve plate in the load sensing valve group and multi-way valve for double pump confluence of construction machinery according to the present invention;

[0028] Figure 4 is the structural schematic diagram of the second oil inlet valve plate in the load sensing valve group and multi-way valve for double pump confluence of construction machinery according to the present invention;

[0029] Figure 5 is the structural schematic diagram of the confluence valve plate in the neutral state in the load sensing valve group and multi-way valve for double pump confluence of construction machinery according to the present invention;

[0030] Figure 6 is the structural schematic diagram of the confluence valve plate in the lifting station in the load sensing valve group and multi-way valve for double pump confluence of construction machinery according to the present invention;

[0031] Figure 7 is the structural schematic diagram of the confluence valve plate in the lowering station in the load sensing valve group and multi-way valve for double pump confluence of construction machinery according to the present invention;

[0032] Explanation of reference numerals: 1. The first oil inlet valve plate; 2. The second oil inlet valve plate; 3. Three-way flow regulating valve; 4. Priority spool; 5. Confluence valve plate; 6. Directional valve plate; 7. Directional valve rod; 8. Solenoid valve oil passage; 9. Logic check valve; 10. Solenoid valve; 11. P1 oil passage; 12. P2 oil passage; 13. LS2 channel; 14. Main relief valve; 15. Steering relief valve; 16. Relief valve 1; 17. Relief valve 2. Detailed implementation manners

[0033] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine with the embodiments to detail this application.

[0034] Such as Figures 1a to 1c and Figures 2 to 7As shown in the figure, the load-sensitive valve group and multi-way valve for dual-pump confluence of construction machinery of the present invention include an oil inlet valve plate 1, a confluence valve plate 5, multiple reversing valve plates 6, and an oil inlet valve plate 2 connected in sequence from left to right; the reversing valve plate 6 is linked with the confluence valve plate 5 to control the confluence or independent oil supply of oil pump P1 and oil pump P2 through a reversing valve rod 7, wherein in the lifting working condition, oil pump P1 and oil pump P2 are confluent to the working port A through a logic check valve 9; the confluence valve plate 5 is provided with an LS2 channel 13 for linking the opening and closing of the three-way flow regulating valve 3 to achieve load-sensitive control.

[0035] The oil inlet valve plate 2 integrates a three-way flow regulating valve 3, and the spring chamber of the three-way flow regulating valve 3 is communicated with the working port A or the oil return port T through the LS2 channel or the LS3 channel for dynamically adjusting the unloading and oil supply switching of the oil pump P2.

[0036] Specifically, as Figure 3 shown, the oil inlet valve plate 1 integrates a priority spool 4, a steering overflow valve 15 and a main overflow valve 14, and has a steering priority function. The oil inlet valve plate 1 also has a P1 oil passage communicated with the confluence valve plate 5 and a P1 oil inlet communicated with the oil pump P1. The oil of the oil inlet valve plate 1 is directly communicated with the oil return port T through the unloading oil passage of the confluence valve plate 5 for the neutral unloading of the oil pump P1.

[0037] The oil of the oil pump P1 passes through the oil inlet P1 of the oil inlet valve plate 1, opens the priority spool 4, and then flows from the P1 oil passage of the oil inlet valve plate 1 through the P1 oil passage 11 of the confluence valve plate 5 to the oil return port T to achieve unloading.

[0038] As Figure 4 shown, the oil inlet valve plate 2 is internally provided with a three-way flow regulating valve 3, and the oil inlet valve plate 2 is also provided with a P2 oil inlet, a T1 oil return port, an LS2 channel and an LS3 channel; the P2 oil inlet is communicated with the oil pump P2; the T1 oil return port is communicated with the fuel tank; an overflow valve 16 and an overflow valve 17 are correspondingly installed at the LS2 channel and the LS3 channel; at the same time, the LS2 channel and the LS3 channel are connected through a shuttle valve.

[0039] The unloading oil passage of the oil inlet valve plate 2 is directly communicated with the T1 oil return port through the three-way flow regulating valve 3 for the neutral unloading of the oil pump P2.

[0040] When the mechanical equipment is not working, the oil inlet valve plate 2 is in the neutral state. The oil pump P2 passes through the P2 oil port of the oil inlet valve plate 2, opens the three-way flow regulating valve 3, and the oil flows from the oil return passage T, through the oil return port T of the confluence valve plate 5 back to the fuel tank.

[0041] When the mechanical equipment is working, the second oil inlet valve plate is in the working position. The pressure is selected by the shuttle valve through the LS2 channel or the LS3 channel and transmitted to the three-way flow regulating valve 3. At this time, the three-way flow regulating valve 3 adjusts the required flow according to the actuator pressure by itself, and the excess oil fluid returns to the oil tank through the oil return passage T.

[0042] As Figure 5 shown, a reversing valve rod 7, a solenoid valve 10 and a logic check valve 9 are installed on the confluence valve plate 5; an oil passage 8 for the solenoid valve, a P1 oil passage 11, a P2 oil passage 12, an LS2 channel 13, an oil return port T and a working port A are also provided inside; the working port A is communicated with the P1 oil passage 11 through the logic check valve 9 and the on-off is controlled; the oil passage 8 for the solenoid valve is controlled to be on and off with the oil return port T through the reversing valve rod); the LS2 channel 13 of the confluence valve plate 5 is located inside the P1 oil passage 11 and is communicated with the LS2 channel of the second oil inlet valve plate 2, and is used to link the opening and closing of the three-way flow regulating valve 3 to realize load sensing control.

[0043] The working principle and working process of the load sensing valve group and the multi-way valve for double pump confluence of the present invention for construction machinery are briefly described below.

[0044] As Figure 5 shown, the reversing valve rod 7 is in the middle position: when the machine is not working, the solenoid valve 10 is not energized and is in the normally closed state, and the oil passage for the solenoid valve is closed. The first oil pump P1 passes through the first oil inlet valve plate 1, the priority spool 4 to the P1 oil passage 11 of the confluence valve plate 5 and is unloaded through the oil return port T; the second oil pump P2 passes through the second oil inlet valve plate 2 to the reversing valve plate 6 and then to the P2 oil passage 12 of the confluence valve plate 5. At this time, the P2 oil passage of the confluence valve plate 5 is closed. Since the LS2 channel of the second oil inlet valve plate 2 is communicated with the oil return port T, the second oil pump P2 is unloaded by the three-way flow regulating valve 3 in the second oil inlet valve plate 2 and returns to the oil tank through the T port of the confluence valve plate 5. At this time, the first oil pump P1 and the second oil pump P2 complete the middle position unloading. Compared with the conventional open center multi-way valve group, the unloading oil circuit is shorter, the pressure loss is lower, and more energy is saved.

[0045] As Figure 6 shown, the reversing valve rod 7 is in the lifting position: when the machine is in the lifting working condition, the solenoid valve is energized at this time and changes from the normally closed state to the normally open state; the first oil pump P1 passes through the first oil inlet valve plate 1, the priority spool 4 to the P1 oil passage 11 of the confluence valve plate. At this time, the oil return passage T is closed, and the P1 oil fluid is controlled by the reversing valve rod 7 to pass through the internal oil passage of the confluence valve plate, pass through the logic check valve 9 to reach the working port A, and then is supplied to the lifting actuator through the pipeline. At this time, the LS2 channel 13 in the confluence valve plate is communicated with the working port A, and the pressure is the load pressure, and it passes through the internal oil passage of the reversing valve plate in the valve group to the spring chamber of the three-way flow regulating valve 3 in the second oil inlet valve plate 2. At this time, the three-way flow regulating valve 3 stops unloading.

[0046] The P2 oil passage 12 of the second oil pump P2 goes from the second oil inlet valve plate 2 to the reversing valve plate and then to the confluence valve plate. It is controlled by the reversing valve rod to merge with the P1 oil fluid into the same oil passage, completing the double-pump confluence function and achieving the purpose of rapid lifting.

[0047] As Figure 7 shown, the reversing valve rod is in the lowered position: When the machine is in the lowering working condition, at this time the solenoid valve is energized and changes from normally closed to normally open. The solenoid valve passage is connected to the oil return passage, and the logic check valve 9 opens. At this time, the oil of the actuator passes through the working port A and is connected to the oil return passage, and the actuator starts to lower.

[0048] The first oil pump P1 is controlled by the reversing valve rod to communicate with the oil return port T through the internal oil passage of the confluence valve plate and continues to unload; the second oil pump P2 goes from the second oil inlet valve plate 2 to the reversing valve plate 6 and then to the P2 oil passage 12 of the confluence valve plate 5. At this time, the P2 oil passage is closed, the LS2 oil passage is connected to the oil return passage T, and the second oil pump P2 is unloaded by the three-way flow regulating valve 3 in the second oil inlet valve plate 2 and returns to the fuel tank through the T port of the confluence valve plate.

[0049] The first oil inlet valve plate and the confluence valve plate of the first stage are integrated with steering priority, and the second oil inlet valve plate is integrated with a three-way flow regulating valve, using two kinds of valve cores to control two variables respectively. Compared with the conventional open-center multi-way valve group, the left oil inlet valve plate unloads from the confluence valve plate of the first stage, and the right oil inlet valve plate unloads directly from the oil inlet side. The unloading oil circuit is shorter, the pressure loss is lower, and more energy is saved, which can effectively reduce energy waste.

[0050] The confluence valve plate of the first stage requires a large flow rate during the lifting working condition. After commutation, the left and right oil inlets are confluent in the first stage to supply the lifting actuator; the flow rates required by the remaining actuators are relatively small, and the right oil inlet can meet the requirements. Combining the large-flow valve and the small-flow valve can meet different working conditions respectively, saving the installation volume of the main engine and the cost of the whole valve.

[0051] The three-way flow regulating valve built into the second oil inlet valve plate can adjust the flow rate and pressure in real time according to the system requirements, maintain the pressure stability, achieve precise load control, ensure the stable operation of the equipment under various working conditions, and avoid the occurrence of overloading or underloading. By precisely controlling the load, the load-sensitive valve helps to reduce the wear and pressure fluctuation of the equipment, thereby extending the service life of the equipment.

[0052] This solution solves the problems of high energy consumption, slow response, and poor compatibility of traditional multi-way valve groups through oil circuit optimization, confluence logic innovation, and intelligent flow regulation. It has significant application value in the fields of construction machinery, lifting equipment, etc., especially suitable for scenarios that require frequent start-stop and high-precision load control, with improved comprehensive energy efficiency.

[0053] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A load sensing valve group and a multi-way valve for double pump confluence of construction machinery, characterized in that, It includes an oil inlet valve plate 1, a confluence valve plate 5, multiple reversing valve plates 6, and an oil inlet valve plate 2 connected in sequence. The oil inlet valve plate 1 integrates a priority spool 4, a main overflow valve 14, and a steering overflow valve 15. Its internal P1 passage is directly connected to the unloading oil passage of the confluence valve plate 5 and returns oil to the oil port T. The oil inlet valve plate 2 is internally provided with a three-way flow regulating valve 3, and its unloading oil passage is directly connected to the T1 oil return port through the three-way flow regulating valve 3. The confluence valve plate 5 is provided with a reversing valve rod 7, a logic check valve 9, and an LS2 passage 13. The reversing valve plate 6 is linked with the confluence valve plate 5, and controls the confluence or independent oil supply of oil pump 1 (P1) and oil pump 2 (P2) through the reversing valve rod 7. During the lifting operation, oil pump 1 (P1) and oil pump 2 (P2) are confluent to the working port A through the logic check valve 9. The LS2 passage 13 is linked with the three-way flow regulating valve 3 to achieve load sensing control.

2. The load sensing valve block and multi-way valve for double pump confluence used in construction machinery according to claim 1, characterized in that, The neutral unloading path of oil pump 1 (P1) is: P1 oil inlet → priority spool 4 → P1 oil passage 11 of the confluence valve plate 5 → oil port T.

3. The load sensing valve bank and multi-way valve for double pump confluence used in construction machinery according to claim 1, characterized in that, The oil inlet valve plate 2 is provided with an LS2 passage and an LS3 passage. The shuttle valve selects the actuator pressure and transmits it to the spring chamber of the three-way flow regulating valve 3 to dynamically adjust the oil supply and unloading switching of oil pump 2 (P2).

4. The load sensing valve bank and multi-way valve for the double-pump confluence used in construction machinery according to claim 1, characterized in that, An overflow valve 1 and an overflow valve 2 are respectively installed at the corresponding positions of the LS2 passage and the LS3 passage; at the same time, the LS2 passage and the LS3 passage are connected through a shuttle valve.

5. The load sensing valve block and multi-way valve for double pump confluence used in construction machinery according to claim 1, characterized in that, The unloading oil passage of the confluence valve plate 5 includes an independently provided P1 oil passage 11 and a P2 oil passage 12. During neutral unloading, oil pump 1 (P1) and oil pump 2 (P2) return oil through the P1 oil passage 11 and the three-way flow regulating valve 3 respectively, and the unloading path length is shortened compared with the traditional valve group.

6. The load sensing valve bank and multi-way valve for double pump confluence used in construction machinery according to claim 1, characterized in that, The logic check valve 9 connects the P1 oil passage 11 and the working port A during the lifting operation. At the same time, the LS2 passage 13 feeds back the load pressure to the three-way flow regulating valve 3, triggering oil pump 2 (P2) to stop unloading and confluent oil supply with oil pump 1 (P1).

7. The load sensing valve bank and multi-way valve for double pump confluence used in construction machinery according to claim 1, wherein The confluence valve plate 5 is provided with an electromagnetic valve 10 to control the opening and closing of the logic check valve 9. During the lowering operation, the electromagnetic valve 10 is opened to connect the working port A to the oil return port T. At the same time, oil pump 1 (P1) unloads through the P1 oil passage 11, and oil pump 2 (P2) unloads through the three-way flow regulating valve 3.

8. The load sensing valve group and multi-way valve for double pump confluence used in construction machinery according to claim 1, characterized in that, The confluence valve plate 5 is provided with an electromagnetic valve oil passage 8, and the electromagnetic valve oil passage 8 and the oil return port T are controlled to be opened and closed by the reversing valve rod 7.

9. The load sensing valve block and multi-way valve for double pump confluence used in construction machinery according to claim 1, characterized in that, When the reversing valve rod is in the lifting position, the electromagnetic valve is energized and opened. The oil passages of oil pump 1 (P1) and oil pump 2 (P2) are confluent to the working port (A) through the logic check valve, and the pressure of the LS2 passage drives the three-way flow regulating valve to close and unload.

10. The load sensing valve bank and multi-way valve for double pump confluence used in construction machinery according to claim 1, characterized in that, When the reversing valve rod is in the lowering position, the electromagnetic valve is energized and opened. The working port (A) is connected to the oil return port (T). Oil pump 1 (P1) unloads through the reversing valve plate, and oil pump 2 (P2) unloads through the three-way flow regulating valve.

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