Pilot oil source valve group

Abstract

The utility model provides a kind of pilot oil source valve group, including valve body, shuttle valve, speed regulating valve and pressure reducing valve;The valve body is provided with P1 oil inlet, P2 oil inlet, the P1 oil inlet is communicated with MP1 pressure gauge interface, the P2 oil inlet is communicated with MP2 pressure gauge interface;The utility model is by setting P1 and P2 double oil inlet and integrating shuttle valve, can simultaneously connect two-way oil pump, automatically select one-way higher pressure to system oil supply by shuttle valve, realizes the reliable backup and seamless switching of double pump source, to perfect adaptation modern multi-pump hydraulic system;Meanwhile, by setting speed regulating valve before pressure reducing valve, the oil entering is guided flow regulation, so that the flow reaching pressure reducing valve is stabilized in the set small flow range, effectively reduces the requirement to pressure reducing valve specification, so that it can be selected smaller size component, saves installation space and reduces cost.

Description

Technical Field

[0001] This utility model relates to a pilot oil source valve assembly, belonging to the field of control valve technology. Background Technology

[0002] In hydraulic equipment such as construction machinery, providing a stable and reliable low-pressure oil source for the pilot control system is crucial. Traditional pilot oil source acquisition methods typically use a single pressure reducing valve to directly reduce pressure from the main system's pressure circuit. This approach has two significant drawbacks: First, when the main system's input flow is large, the required pressure reducing valve size and specifications must be increased accordingly to handle the large flow, resulting in excessive installation space occupied by the entire valve assembly and increased costs. Second, with the development of hydraulic systems, equipping a single device with multiple hydraulic pump sets has become a common solution to improve operational efficiency and reliability. However, a single inlet design cannot simultaneously connect multiple pump sources, or requires complex external valve circuits, leading to poor system compatibility and integration. Therefore, a pilot oil source valve assembly is proposed. Summary of the Invention

[0003] In view of this, the present invention provides a pilot oil source valve assembly to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial option.

[0004] The technical solution of this utility model is achieved as follows: a pilot oil source valve group, including a valve body, a shuttle valve, a speed regulating valve and a pressure reducing valve; The valve body is provided with an oil inlet P1 and an oil inlet P2. The oil inlet P1 is connected to an MP1 pressure gauge interface, and the oil inlet P2 is connected to an MP2 pressure gauge interface. The two input channels of the shuttle valve are respectively connected to the oil channels of the oil inlet P1 and the oil inlet P2. The output channel of the shuttle valve is connected to the inlet channel of the speed control valve, and the outlet channel of the speed control valve is connected to the inlet channel of the pressure reducing valve. The outlet channel of the pressure reducing valve is provided with an MA pressure gauge interface, an A1 oil outlet, an A2 oil outlet, and a return oil port.

[0005] More preferably, the shuttle valve is configured to automatically compare the oil pressure at the P1 inlet and the P2 inlet, and always guide the oil at the higher pressure end to its output channel while blocking the oil at the lower pressure end.

[0006] More preferably, the speed control valve is configured to regulate the flow rate of the oil in its inlet channel to ensure that the flow rate into the pressure reducing valve remains constant at the required value set for pilot control.

[0007] More preferably, the pressure reducing valve is configured to reduce and stabilize the oil pressure from the speed control valve at the set pressure required by the pilot control system.

[0008] More preferably, the A1 and A2 oil outlets are used to connect the hydraulic pilot control handle of the construction machinery to provide a stable, low-pressure, low-flow pilot control oil source.

[0009] More preferably, the oil return port is connected to the pressure relief channel of the pressure reducing valve. When the outlet pressure of the pressure reducing valve exceeds its set pressure, some oil can be released through the oil return port to prevent the system from overpressure.

[0010] More preferably, the valve body is provided with a plurality of mounting holes, which are used to install the valve assembly onto the hydraulic system or actuator of the engineering machinery.

[0011] The present invention has the following advantages due to the adoption of the above technical solution: This invention, by setting up dual oil inlets P1 and P2 and integrating a shuttle valve, can simultaneously connect two oil pumps. The shuttle valve automatically selects the pump with the higher pressure to supply oil to the system, achieving reliable backup and seamless switching between the two pump sources, thus perfectly adapting to modern multi-pump hydraulic systems. At the same time, by setting a speed regulating valve before the pressure reducing valve, the pilot flow of the incoming oil is regulated, ensuring that the flow reaching the pressure reducing valve is stabilized within a set small flow range. This effectively reduces the requirements for the pressure reducing valve specifications, allowing for the use of smaller components, saving installation space and reducing costs.

[0012] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a structural diagram of the present invention.

[0014] Figure 2 This is a structural diagram of the P1 oil inlet and the P2 oil inlet in this utility model.

[0015] Figure 3 This is a structural diagram of the oil outlet A1 and oil outlet A2 in this utility model.

[0016] Figure 4 This is a schematic diagram of the pilot oil source valve group in this utility model.

[0017] in: 1-Valve body; 10-P; 1-Inlet; 11-P; 2-Inlet; 12-MP; 1-Pressure gauge interface; 13-MP; 2-Pressure gauge interface; 14-MA pressure gauge interface; 15-Return port; 16-A; 1-Outlet; 17-A; 2-Outlet; 18-Mounting hole; 2-Shuttle valve; 3-Speed ​​control valve; 4-Pressure reducing valve. Detailed Implementation To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 of the present utility model and are not intended to limit its scope. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0018] In the description of this utility model, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0019] In the description of this utility model, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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.

[0021] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0022] like Figure 1-4 As shown, this utility model embodiment provides a pilot oil source valve assembly, including a valve body 1, a shuttle valve 2, a speed regulating valve 3, and a pressure reducing valve 4; In one embodiment, valve body 1 is provided with oil inlet P1 10 and oil inlet P2 11. Oil inlet P1 10 is connected to pressure gauge interface MP1 12, and oil inlet P2 11 is connected to pressure gauge interface MP2 13. The two input channels of shuttle valve 2 are respectively connected to the oil channels of oil inlet P1 10 and oil inlet P2 11. The output channel of shuttle valve 2 is connected to the inlet channel of speed control valve 3. The outlet channel of speed control valve 3 is connected to the inlet channel of pressure reducing valve 4. The outlet channel of pressure reducing valve 4 is provided with pressure gauge interface MA 14, oil outlet A1 16, oil outlet A2 17, and return port 15.

[0023] In one embodiment, shuttle valve 2 is configured to automatically compare the oil pressures at inlet P1 10 and inlet P2 11, and always guide the oil with the higher pressure end to its output channel while blocking the oil with the lower pressure end; speed control valve 3 is configured to regulate the flow rate of the oil in its inlet channel to ensure that the flow rate into pressure reducing valve 4 is constant at the required value set for pilot control; pressure reducing valve 4 is configured to reduce the oil pressure from speed control valve 3 and stabilize it at the set pressure required by the pilot control system. Outlet A1 16 and outlet A2 17 are used to connect to the hydraulic pilot control handle of the construction machinery to provide a stable low-pressure, low-flow pilot control oil source; return port 15 is connected to the pressure relief channel of pressure reducing valve 4, and when the outlet pressure of pressure reducing valve 4 exceeds its set pressure, part of the oil can be released through return port 15 to prevent system overpressure; valve body 1 is provided with multiple mounting holes 18 for mounting the valve assembly to the hydraulic system or actuator of the construction machinery.

[0024] In one embodiment, the valve assembly is designed with a maximum working pressure of 350 bar, a maximum output flow rate of 30 L / min, and a maximum output pressure of 40 bar. MP1 pressure gauge interface 12 and MP2 pressure gauge interface 13 are used to install pressure gauges to monitor the pressure at both inlet ports in real time. MA pressure gauge interface 14 is used to install a pressure gauge to display the output pressure after pressure reduction by the pressure reducing valve 4 in real time, facilitating system debugging and monitoring. An S0.6 damping orifice is provided in the outlet channel of the pressure reducing valve 4. The function of this damping orifice is to prevent the pressure reducing valve from experiencing internal leakage and pressure buildup in the valve core chamber during prolonged standby or extremely low flow conditions, ensuring the sensitivity and reliability of the pressure reducing valve 4. The hydraulic interface on the valve body uses a G1 / 4 standard thread, which has good versatility and sealing properties, facilitating connection with various hydraulic components.

[0025] When this utility model is in operation: hydraulic oil can enter the valve group from either the P1 inlet (10) or the P2 inlet (11) or from both inlets at the same time. The shuttle valve (2) compares the two inlet pressures in real time and automatically connects the oil path of the higher pressure side to the downstream side, while blocking the oil path of the lower pressure side, so as to realize the automatic selection of oil supply from the dual pump sources. The selected oil then enters the speed regulating valve (3), which precisely regulates and stabilizes the flow rate at the set value required by the pilot system. After the flow is stabilized, the oil enters the pressure reducing valve (4) and is reduced to the stable low pressure required by the pilot system. Finally, the low-pressure oil that meets the requirements is supplied to the pilot control handle through the A1 outlet (16) and the A2 outlet (17). When the outlet pressure exceeds the set value of the pressure reducing valve (4), its internal pressure relief channel is opened, and part of the oil flows back to the oil tank through the return port (15) to realize the system overpressure protection.

[0026] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A pilot oil source valve group characterized by: It includes a valve body (1), a shuttle valve (2), a speed control valve (3), and a pressure reducing valve (4); The valve body (1) is provided with an oil inlet (10) of P1 and an oil inlet (11) of P2. The oil inlet (10) of P1 is connected to an MP1 pressure gauge interface (12), and the oil inlet (11) of P2 is connected to an MP2 pressure gauge interface (13). The two input channels of the shuttle valve (2) are respectively connected to the oil channels of the oil inlet (10) of P1 and the oil inlet (11) of P2. The output channel of the shuttle valve (2) is connected to the inlet channel of the speed regulating valve (3). The outlet channel of the speed regulating valve (3) is connected to the inlet channel of the pressure reducing valve (4). The outlet channel of the pressure reducing valve (4) is provided with an MA pressure gauge interface (14), an A1 oil outlet (16), an A2 oil outlet (17), and a return oil port (15).

2. A pilot fluid source valve group according to claim 1, characterized in that: The shuttle valve (2) is configured to automatically compare the oil pressure at the P1 inlet (10) and the P2 inlet (11), and always guide the oil at the higher pressure end to its output channel, while blocking the oil at the lower pressure end.

3. A pilot operated valve group according to claim 1, characterized in that: The speed control valve (3) is configured to regulate the flow rate of the oil in its inlet channel to ensure that the flow rate into the pressure reducing valve (4) is constant at the required value set for pilot control.

4. A pilot oil source valve assembly according to claim 3, characterized in that: The pressure reducing valve (4) is configured to reduce and stabilize the oil pressure from the speed control valve (3) at the set pressure required by the pilot control system.

5. A pilot fluid source valve group according to claim 1, characterized in that: The A1 oil outlet (16) and A2 oil outlet (17) are used to connect the hydraulic pilot control handle of the engineering machinery to provide a stable low-pressure, low-flow pilot control oil source.

6. A pilot fluid source valve group according to claim 1, characterized in that: The return port (15) is connected to the pressure relief channel of the pressure reducing valve (4). When the outlet pressure of the pressure reducing valve (4) exceeds its set pressure, some oil can be released through the return port (15) to prevent the system from overpressure.

7. The pilot oil source valve assembly according to claim 1, characterized in that: The valve body (1) is provided with a plurality of mounting holes (18), which are used to install the valve assembly on the hydraulic system or actuator of the engineering machinery.

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