Pilot end cap, multi-way directional valve and hydraulic system

Abstract

This utility model belongs to the field of hydraulic control technology and discloses a pilot end cover, a multi-way directional valve, and a hydraulic system. The pilot end cover includes an end cover body, several control valves, and several connectors. The end cover body is provided with an oil inlet circuit and an oil return circuit, and after being connected to an external connector, it can form several pilot control chambers. Several control valves are all located on the end cover body and are positioned between the oil inlet circuit and the oil return circuit. Each control valve corresponds to one of the pilot control chambers. The control valves are used to connect the pilot control chambers to the oil inlet circuit or to the oil return circuit. Several connectors are all located on the end cover body and can connect to at least some of the pilot control chambers. This pilot end cover integrates the oil inlet circuit, the oil return circuit, and several pilot control chambers, resulting in low cost, good sealing, and the ability to perform electrical or hydraulic control, thus offering good flexibility and versatility.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, and in particular to a pilot end cap, a multi-way directional valve, and a hydraulic system. Background Technology

[0002] The hydraulic system control unit of construction machinery typically includes a multi-way valve controlled by a hydraulic pilot handle. This multi-way valve integrates the operational control functions of the construction machinery to achieve multiple functions. The hydraulic pilot handle includes a pilot end cap, which is directly bolted to the multi-way valve. However, the pilot end cap is usually a separate design; when the multi-way valve includes multiple valve cores, multiple pilot end caps are required. This separate design requires numerous connecting pipelines, wasting costs, affecting on-site assembly efficiency, reducing aesthetics, and creating too many leakage points, easily leading to oil leakage failures. The increased number of mating surfaces between the multiple pilot end caps and the valve body of the multi-way valve, along with the increased number of sealing positions, increases the risk of leakage under long-term pressure or vibration. Furthermore, the separate design results in more bends or abrupt changes in the internal and external oil passages, causing turbulent oil flow paths, increased local eddies or pressure drops, and thus increased overall system energy loss, which is detrimental to improving economic efficiency.

[0003] To address the aforementioned issues, a pilot-operated integrated multi-way valve assembly is provided in the related technology. This assembly includes a multi-way valve, a multi-way valve control end cap, and a pilot valve. The oil passages of the pilot valve are all located inside the multi-way control end cap, which can reduce the number of pipeline connections. However, this pilot-operated integrated multi-way valve assembly still suffers from low reliability and poor versatility. Utility Model Content

[0004] The purpose of this utility model is to provide a pilot end cap, a multi-way directional valve, and a hydraulic system. The pilot end cap can both supply and return oil to the pilot control chamber through a control valve and through a connector, thereby improving the flexibility and reliability of the pilot end cap.

[0005] On one hand, this utility model provides a pilot end cap, the pilot end cap comprising:

[0006] The end cap body is provided with an oil inlet circuit and an oil return circuit, and the end cap body can form several pilot control chambers after being connected to an external connector.

[0007] A plurality of control valves are provided on the end cover body, and the plurality of control valves are provided between the oil inlet circuit and the oil return circuit, and the plurality of control valves are provided in one-to-one correspondence with the plurality of pilot control chambers; the control valves are used to connect the pilot control chamber to the oil inlet circuit, or to connect the pilot control chamber to the oil return circuit;

[0008] A plurality of connectors are provided on the end cap body, and the plurality of connectors are capable of communicating with at least a portion of the pilot control cavities one by one.

[0009] As an optional technical solution, when the control valve is energized, the oil inlet circuit is connected to the pilot control chamber, and when the control valve is de-energized, the oil return circuit is connected to the pilot control chamber.

[0010] As an optional technical solution, the control valve is an electro-proportional pressure reducing valve.

[0011] As an optional technical solution, the working pressure range of the electro-proportional pressure reducing valve is 0 bar to 50 bar.

[0012] As an optional technical solution, the pilot end cap also includes a plurality of plugs, which can seal the plurality of joints one by one.

[0013] As an optional technical solution, a control valve and a connector corresponding to the same pilot control cavity form a combination, and a number of control valves and a number of connectors form a number of combinations that correspond one-to-one with the pilot control cavity, and the number of combinations are spaced apart along the extension direction of the end cap body.

[0014] As an optional technical solution, all the control valves and the connectors are located on the first end face of the end cover body.

[0015] As an optional technical solution, all the control valves and connectors are located on the first end face of the end cover body. The second end face of the end cover body is provided with an oil inlet and an oil return port. The oil inlet is connected to the oil inlet circuit, and the oil return port is connected to the oil return circuit. Both the oil inlet and the oil return port are used to connect to an oil source. The first end face and the second end face are arranged at an angle.

[0016] On the other hand, this utility model also provides a multi-way reversing valve, which includes a valve body, a plurality of valve cores and the aforementioned pilot end cap. The valve body is provided with an inner cavity, and the plurality of valve cores are slidably disposed in the inner cavity. The plurality of valve cores are arranged in parallel and spaced apart. The pilot end cap is provided at both ends of the valve body along the axial direction of the valve cores. The plurality of pilot control cavities formed between the pilot end caps and the valve body are arranged in a one-to-one correspondence with the plurality of valve cores.

[0017] On the other hand, this utility model also provides a hydraulic system, which includes the above-mentioned multi-way directional valve.

[0018] The pilot end cap provided by this utility model has at least the following beneficial effects:

[0019] The pilot end cap provided by this utility model includes an end cap body, several control valves, and several connectors. The end cap body is provided with an oil inlet circuit and an oil return circuit, and after the end cap body is connected to an external connector, it can form several pilot control chambers. Several control valves are all provided on the end cap body and are all located between the oil inlet circuit and the oil return circuit. Several control valves are provided in a one-to-one correspondence with several pilot control chambers. The control valves are used to connect the pilot control chambers to the oil inlet circuit or to the oil return circuit. Several connectors are all provided on the end cap body and can be connected to at least some of the pilot control chambers in a one-to-one correspondence. This type of pilot end cap connects to the valve body of a multi-way valve, forming several pilot control chambers. It integrates the inlet and return oil circuits with these pilot control chambers, reducing the need for seals and improving sealing reliability and installation efficiency. When electrically controlled, the pilot end cap can connect to the inlet or return oil circuit via a control valve, allowing oil to be supplied to or returned from the pilot control chambers, ensuring its performance. When hydraulically controlled, several connectors can supply oil to or return oil to the corresponding pilot control chambers, again ensuring performance. This pilot end cap offers good flexibility and versatility, allowing for both electrical and hydraulic control depending on the application.

[0020] The multi-way reversing valve provided by this utility model has at least the following beneficial effects:

[0021] The multi-way directional valve provided by this utility model includes a valve body, several valve cores, and the aforementioned pilot end cap. The valve body has an inner cavity, in which the valve cores are slidably disposed, parallel, and spaced apart. Pilot end caps are provided at both ends of the valve cores on the valve body, and several pilot control chambers of the pilot end caps correspond one-to-one with the valve cores. This multi-way directional valve allows for valve core adjustment via electrical or hydraulic control, thus providing good operational flexibility.

[0022] The multi-way reversing valve provided by this utility model has at least the following beneficial effects:

[0023] The hydraulic system provided by this utility model includes the aforementioned multi-way directional valve, which can provide good flexibility of use while ensuring the normal function of the hydraulic system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the pilot end cap of this utility model applied to a multi-way directional valve;

[0025] Figure 2This is a cross-sectional view of the pilot end cap of this utility model applied to a multi-way directional valve.

[0026] In the picture:

[0027] 100. Valve body;

[0028] 10. End cap body; 101. First end face; 102. Second end face; 11. Oil inlet circuit; 12. Oil return circuit; 13. Oil inlet; 14. Oil return port;

[0029] 20. Control valve;

[0030] 30. Connector;

[0031] 40. Plug. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] like Figure 1 and Figure 2 As shown, this embodiment provides a pilot end cap, which includes an end cap body 10, a plurality of control valves 20, and a plurality of connectors 30. The end cap body 10 is provided with an oil inlet circuit 11 and an oil return circuit 12, and the end cap body 10 can form a plurality of pilot control chambers after being connected to an external connector. The plurality of control valves 20 are all disposed on the end cap body 10, and are all disposed between the oil inlet circuit 11 and the oil return circuit 12, and the plurality of control valves 20 are disposed one-to-one with the plurality of pilot control chambers. The control valves 20 are used to connect the pilot control chambers to the oil inlet circuit 11 or to the pilot control chambers to the oil return circuit 12. The plurality of connectors 30 are all disposed on the end cap body 10, and the plurality of connectors 30 can be connected one-to-one with at least some of the pilot control chambers.

[0037] Specifically, in this embodiment, taking the pilot end cap applied to a multi-way valve as an example, after the pilot end cap is connected to the valve body 100 of the multi-way valve, it forms several pilot control chambers with the valve body 100. It can integrate the oil inlet circuit 11, the oil return circuit 12 and several pilot control chambers, which can reduce the setting of seals and effectively reduce costs. When the pilot end cap is electrically controlled, it can supply power to the control valve 20 or de-energize the control valve 20, thereby controlling the working state of the control valve 20. This allows the pilot control chamber to be connected to the oil inlet circuit 11 or the oil return circuit 12 through the corresponding control valve 20, thereby supplying oil to the pilot control chamber or returning oil from the pilot control chamber, ensuring the performance of the pilot end cap. When the pilot end cap is hydraulically controlled, it can supply oil to several pilot control chambers one by one through several connectors 30, or allow several pilot control chambers to return oil one by one through several connectors 30, which can also ensure the performance of the pilot end cap. This type of pilot end cap can be electrically or hydraulically controlled depending on the actual use, thus offering good flexibility and versatility.

[0038] Optionally, in this embodiment, a portion of the pilot control chamber is connected to the oil inlet circuit 11 and the oil return circuit 12 via the control valve 20, and is also connected to the connector 30.

[0039] Optionally, the number of control valves in the pilot end cap in this embodiment can be 1, 2, 3, 4, 5 or even more, as long as the number of control valves and the number of pilot control cavities formed by the pilot end cap and the external connector are set in a one-to-one correspondence. No specific restrictions are imposed here.

[0040] In another embodiment, all pilot control chambers are connected to the oil inlet circuit 11 and the oil return circuit 12 via control valve 20, and are also connected to connector 30, which will not be described in detail here.

[0041] Furthermore, the control valve 20 is a solenoid valve. When the solenoid valve is energized, the oil inlet circuit 11 is connected to the pilot control chamber. When the solenoid valve is de-energized, the oil return circuit 12 is connected to the pilot control chamber. Specifically, in this embodiment, the control valve 20 is a solenoid valve. When the solenoid valve is de-energized, the oil return circuit 12 is connected to the pilot control chamber, thereby ensuring that the oil pressure in the pilot control chamber is in a low-pressure state. When the pilot end cap is applied to a multi-way directional valve, the valve core in the pilot control chamber can be in the initial state, thereby reducing energy loss, improving energy utilization, and optimizing the force on the valve core, which is beneficial to extending the service life of the valve core. When the solenoid valve is energized, the oil inlet circuit 11 is connected to the pilot control chamber, which facilitates the control of the oil pressure in the pilot control chamber and helps to improve control accuracy.

[0042] Furthermore, the control valve 20 is an electro-proportional pressure reducing valve. Specifically, in this embodiment, when the electro-proportional pressure reducing valve is powered on or de-energized, it can switch the connection state between the pilot control chamber and the oil inlet circuit 11 and the oil return circuit 12, thereby supplying oil to or returning oil from the pilot control chamber, thus ensuring the performance of the pilot end cap. The electro-proportional pressure reducing valve can also adjust its opening degree, thereby adjusting the pressure of the oil in the pilot control chamber, thus improving control accuracy and meeting user needs. Electro-proportional pressure reducing valves are existing technology and will not be described in detail here.

[0043] Furthermore, the operating pressure range of the electro-proportional pressure reducing valve is 0 bar to 50 bar. Specifically, in this embodiment, the operating pressure range of the electro-proportional pressure reducing valve is 0 bar to 50 bar, which ensures normal control of the valve core. This value is based on data obtained from actual experience or experiments. In another embodiment, this operating pressure range can be adjusted according to different applications, and no specific limitations are made here.

[0044] Furthermore, such as Figure 1and Figure 2 As shown, the pilot end cap also includes several plugs 40, which seal several connectors 30 one by one. Specifically, in this embodiment, when the plugs 40 are not connected to external pipelines, the plugs 40 can seal the connectors 30, thus isolating the pilot control cavity from the outside world and ensuring the sealing performance of the pilot control cavity.

[0045] Optionally, in this embodiment, the plug 40 is a steel plug to ensure the stability of the connection with the connector 30.

[0046] In another embodiment, the material of the plug 40 can be specifically selected according to the actual use, and no specific limitation is made here.

[0047] Furthermore, such as Figure 1 and Figure 2 As shown, a control valve 20 and a connector 30 corresponding to the same pilot control cavity form a combination. Several control valves 20 and several connectors 30 form several combinations that correspond one-to-one with several pilot control cavities. Several combinations are arranged sequentially along the extension direction of the end cover body 10.

[0048] Specifically, in this embodiment, the sequential arrangement of several combinations along the extension direction of the end cap body 10 can improve space utilization and facilitate identification during assembly, thereby improving assembly efficiency.

[0049] Optionally, the positions of the control valve 20 and the connector 30 located in the same assembly can be specifically set according to actual use, and no specific restrictions are made here.

[0050] Furthermore, such as Figure 1 As shown, all control valves 20 and connectors 30 are located on the first end face 101 of the end cap body 10. Specifically, in this embodiment, this arrangement facilitates identification during assembly and improves assembly efficiency.

[0051] Optionally, in this embodiment, the first end face 101 is one of the side faces of the end cap body 10.

[0052] Furthermore, such as Figure 1As shown, the second end face 102 of the end cap body 10 is provided with an oil inlet 13 and an oil return port 14. The oil inlet 13 is connected to the oil inlet circuit 11, and the oil return port 14 is connected to the oil return circuit 12. Both the oil inlet 13 and the oil return port 14 are used to connect to the oil source. The first end face 101 and the second end face 102 are set at an angle. Specifically, in this embodiment, the oil inlet 13 is connected to the oil source through an oil inlet pipeline, and the oil return port 14 is connected to the oil source through a oil return pipeline. When the control valve 20 is energized, the oil source supplies oil to the pilot control chamber in sequence through the oil inlet pipeline, the oil inlet 13, the oil inlet circuit 11, and the control valve 20. When the control valve 20 is de-energized, the oil in the pilot control chamber returns to the oil source in sequence through the control valve 20, the oil return circuit 12, the oil return port 14, and the oil return pipeline to ensure the control effect of the pilot control chamber.

[0053] Optionally, in this embodiment, the second end face 102 of the end cap body 10 is the end face facing away from the pilot control cavity, thereby avoiding interference from the control valve 20 and connector 30 to the oil inlet 13 and oil return port 14, thereby ensuring that the oil inlet 13 and oil return port 14 can be connected to the oil inlet pipeline and oil return pipeline respectively, thus ensuring the reliability of oil supply.

[0054] This embodiment also provides a multi-way directional valve, which includes a valve body 100, a plurality of valve cores, and the aforementioned pilot end caps. The valve body 100 has an inner cavity, in which the plurality of valve cores are slidably disposed, and are arranged parallel and spaced apart. Pilot end caps are provided at both ends of the valve body 100 along the axial direction of the valve cores, and a plurality of pilot control chambers formed between the pilot end caps and the valve body 100 are correspondingly arranged with the plurality of valve cores. This multi-way directional valve can adjust the valve cores through electronic or hydraulic control, thus having good operational flexibility.

[0055] Specifically, in this embodiment, when the control valve 20 is energized, the oil source sequentially supplies oil to the pilot control chamber through the oil inlet pipe, oil inlet 13, oil inlet circuit 11 and control valve 20 to drive the valve core to move and realize the adjustment function; when the control valve 20 is de-energized, the oil in the pilot control chamber sequentially passes through the control valve 20, return oil circuit 12, return oil inlet 14 and return oil pipe and returns to the oil source, and the valve core resets to ensure the control effect of the multi-way directional valve.

[0056] This utility model also provides a hydraulic system, which includes the aforementioned multi-way directional valve, and can provide good flexibility of use while ensuring the normal function of the hydraulic system.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pilot end cap, characterized in that, The pilot end cap includes: End cap body (10), the end cap body (10) is provided with an oil inlet circuit (11) and an oil return circuit (12), and the end cap body (10) can form several pilot control chambers after being connected to an external connector; A plurality of control valves (20) are provided on the end cap body (10), and the plurality of control valves (20) are provided between the oil inlet circuit (11) and the oil return circuit (12), and the plurality of control valves (20) are provided in a one-to-one correspondence with the plurality of pilot control chambers; the control valves (20) are used to connect the pilot control chamber to the oil inlet circuit (11) or to connect the pilot control chamber to the oil return circuit (12); A plurality of connectors (30) are provided on the end cap body (10), and the plurality of connectors (30) are capable of communicating with at least a portion of the pilot control cavities one by one.

2. The pilot end cap according to claim 1, characterized in that, The control valve (20) is a solenoid valve. When the solenoid valve is energized, the oil inlet circuit (11) is connected to the pilot control chamber. When the solenoid valve is de-energized, the oil return circuit (12) is connected to the pilot control chamber.

3. The pilot end cap according to claim 1, characterized in that, The control valve (20) is an electro-proportional pressure reducing valve.

4. The pilot end cap according to claim 3, characterized in that, The operating pressure range of the electro-proportional pressure reducing valve is 0 bar to 50 bar.

5. The pilot end cap according to claim 1, characterized in that, The pilot end cap also includes a plurality of plugs (40), which can seal the plurality of joints (30) one by one.

6. The pilot end cap according to any one of claims 1-5, characterized in that, A control valve (20) and a connector (30) corresponding to the same pilot control cavity form a combination. A plurality of control valves (20) and a plurality of connectors (30) form a plurality of combinations corresponding one-to-one with the pilot control cavity. The plurality of combinations are spaced apart along the extension direction of the end cap body (10).

7. The pilot end cap according to any one of claims 1-5, characterized in that, All of the control valves (20) and the connectors (30) are located on the first end face (101) of the end cap body (10).

8. The pilot end cap according to claim 7, characterized in that, The second end face (102) of the end cap body (10) is provided with an oil inlet (13) and an oil return port (14). The oil inlet (13) is connected to the oil inlet circuit (11), and the oil return port (14) is connected to the oil return circuit (12). Both the oil inlet (13) and the oil return port (14) are used to connect to the oil source. The first end face (101) and the second end face (102) are set at an angle.

9. A multi-way directional valve, characterized in that, The multi-way directional valve includes a valve body (100), a plurality of valve cores, and a pilot end cap as described in any one of claims 1-8. The valve body (100) is provided with an inner cavity, and the plurality of valve cores are slidably disposed in the inner cavity. The plurality of valve cores are arranged in parallel and spaced apart. The pilot end cap is provided at both ends of the valve body (100) along the axial direction of the valve cores. The plurality of pilot control cavities formed between the pilot end caps and the valve body (100) are arranged in a one-to-one correspondence with the plurality of valve cores.

10. A hydraulic system, characterized in that, The hydraulic system includes the multi-way directional valve as described in claim 9.

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