A small flow oil supply device based on a load sensing system

Abstract

The utility model discloses a small flow oil supply device based on load sensing system includes load sensing pump, load sensing valve, actuating mechanism and water pump motor still includes adjustable flow valve, solenoid valve group and check valve, the output of load sensing pump is connected with the input of load sensing valve, and the first output of load sensing valve is connected with actuating mechanism, and the second output of load sensing valve is connected with adjustable flow valve, the input of solenoid valve group in proper order, and solenoid valve group is connected with water pump motor, and the output of water pump motor is connected with the inside passage of load sensing valve through check valve, and the inside passage is connected with the x mouth of load sensing pump, the utility model discloses through the adjustable flow valve, solenoid valve group and check valve of additional formation oil supply path and control, adjustable flow valve accurate regulation small flow, and solenoid valve group realizes the on-off control of oil supply, and check valve cooperation maintains constant flow oil supply, and it is easy to arrange in the existing load sensing system.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic system technology, specifically relating to a low-flow oil supply device based on a load-sensitive system. Background Technology

[0002] See Figure 1 Existing load-sensitive systems typically include a load-sensitive pump, a load-sensitive valve, a pump motor, and an actuator. However, the original load-sensitive valve has an excessively large bore (standard flow rate 90L / Min). When the pump motor needs to be supplied with oil at a rate of 1-2L / Min, the corresponding valve core has a large oil supply accuracy error, making it difficult to meet the requirements for low-flow oil supply accuracy in practical applications.

[0003] To address this, a low-flow oil supply device based on a load-sensitive system is proposed. Utility Model Content

[0004] To address the aforementioned technical problems, the purpose of this utility model is to provide a low-flow oil supply device based on a load-sensitive system, thereby solving the technical problem of large accuracy errors when the existing load-sensitive system supplies oil to the water pump motor at a low flow rate.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A low-flow oil supply device based on a load-sensitive system includes a load-sensitive pump, a load-sensitive valve, an actuator, and a water pump motor. It also includes an adjustable flow valve, a solenoid valve assembly, and a check valve. The output end of the load-sensitive pump is connected to the input end of the load-sensitive valve. The first output end of the load-sensitive valve is connected to the actuator. The second output end of the load-sensitive valve is sequentially connected to the input ends of the adjustable flow valve and the solenoid valve assembly. The solenoid valve assembly is connected to the water pump motor. The output end of the water pump motor is connected to the internal channel of the load-sensitive valve via the check valve, and the internal channel is connected to the x-port of the load-sensitive pump.

[0007] As a preferred embodiment of this utility model, the adjustable flow valve has an adjustment stroke of 0-6L / Min to meet the needs of small flow rate adjustment.

[0008] As a preferred embodiment of this utility model, the solenoid valve assembly has a de-energized state and an energized state. When the solenoid valve assembly is in the de-energized state, the output pressure of the load-sensitive pump acts on port A of the solenoid valve assembly, and port A of the solenoid valve assembly is blocked, stopping the oil supply to the water pump motor. At the same time, port P of the water pump motor is connected to the return oil, and there is no pressure at port P of the water pump motor, so the water pump motor stops working. When the solenoid valve assembly is in the energized state, the output pressure of the load-sensitive pump acts on port A of the adjustable flow valve, and the adjustable flow valve outputs flow from port B according to the calibrated flow rate. The flow rate supplies oil to the water pump motor through ports P and B of the solenoid valve assembly, thereby realizing the oil supply control of the water pump motor.

[0009] As a further embodiment of this utility model, the one-way valve transmits the load pressure of the water pump motor during operation to the internal channel of the load-sensitive valve, and acts on the x port of the load-sensitive pump, so that the load-sensitive pump is in a loaded state, maintaining a constant flow of oil supply from the load-sensitive pump to the water pump motor, and ensuring the stability of the oil supply.

[0010] As a preferred embodiment of this utility model, there are multiple actuators, and each actuator is connected to the output end of the load-sensitive valve, which can meet the working requirements of multiple actuators.

[0011] Compared with existing technologies, the low-flow oil supply device based on a load-sensitive system provided by this utility model has the following advantages:

[0012] This invention adds an adjustable flow valve, a solenoid valve assembly, and a check valve to form a new oil supply path. The adjustable flow valve precisely regulates the small flow rate, the solenoid valve assembly realizes the on / off control of the oil supply, and the check valve works together to maintain a constant flow rate, thereby solving the problem of poor accuracy of small flow rate oil supply in existing systems. This invention has a simple structure and is easy to deploy on existing load-sensitive systems to achieve adjustable small flow rate oil supply. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of an existing load-sensitive system;

[0015] Figure 2 This is a structural schematic diagram of an embodiment of the present utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0017] In the description of the embodiments of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and 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 embodiments of this utility model.

[0018] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0019] See appendix Figure 2 As shown in the figure, an embodiment of this utility model discloses a small-flow oil supply device based on a load-sensitive system, including a load-sensitive pump, a load-sensitive valve, multiple actuators, a water pump motor, an adjustable flow valve, a solenoid valve assembly, and a check valve. The output end of the load-sensitive pump is connected to the input end of the load-sensitive valve. The first output end of the load-sensitive valve is connected to multiple actuators to control their operation. The second output end of the load-sensitive valve is sequentially connected to the input ends of the adjustable flow valve and the solenoid valve assembly. The output end of the solenoid valve assembly is connected to the water pump motor. The output end of the water pump motor is connected to the internal channel of the load-sensitive valve through a check valve, and this internal channel is connected to the x-port of the load-sensitive pump.

[0020] When the solenoid valve assembly loses power, the pressure at the load-sensitive pump port acts on port A of the solenoid valve assembly, blocking port A and stopping the oil supply to the water pump motor. At the same time, port P of the water pump motor is connected to the return oil, and there is no pressure at port P of the water pump motor, so the water pump motor stops supplying oil.

[0021] When the solenoid valve assembly is energized, the output pressure of the load-sensitive pump acts on port A of the adjustable flow valve. The adjustable flow valve outputs from port B according to the calibrated flow rate, and supplies oil to the water pump motor through ports P and B of the solenoid valve assembly. At this time, the motor is working. The load pressure of the water pump motor when it is working acts on port x of the load-sensitive pump through the check valve and the internal channel of the load-sensitive valve, so that the water pump motor is in a loaded state and maintains a constant flow of oil supply to the water pump motor.

[0022] The above technical solution, which combines an adjustable flow valve, a solenoid valve assembly, and a check valve, enables adjustable low-flow oil supply to the water pump motor in a load-sensitive system, improving oil supply accuracy and meeting practical application requirements. Its structure is simple and easy to install on existing load-sensitive systems.

[0023] The oil circuit control process in the above-described utility model embodiment under power-off and power-on states is as follows:

[0024] I. Solenoid valve power failure and power supply interruption status:

[0025] 1. Oil circuit blockage:

[0026] The pressure oil output by the load-sensitive pump flows through the main oil circuit of the load-sensitive valve to the actuator (such as a hydraulic cylinder) to drive it to work.

[0027] At this time, the solenoid valve assembly is de-energized. The load-sensitive pump port pressure acts on port A of the solenoid valve assembly, but port A of the solenoid valve assembly is blocked, cutting off the oil supply path to the adjustable flow valve and the water pump motor.

[0028] 2. Unloading the water pump motor:

[0029] The P port of the water pump motor is connected to the oil tank (isolated from the main oil circuit) through an independent return oil channel. The water pump motor stops running when there is no pressure inside.

[0030] The load-sensitive pump maintains its normal operating state through load feedback from the main oil circuit (such as the pressure of the actuator) and only supplies oil to the actuator.

[0031] II. Electromagnetic valve energized and supplying oil:

[0032] 1. Activation of low-flow fuel supply path:

[0033] After the solenoid valve assembly is energized, the pressure oil output by the load-sensitive pump is divided into two paths:

[0034] Main oil circuit: Continues to supply oil to the actuators to drive their operation.

[0035] Low-flow branch: The output pressure of the load-sensitive pump acts on port A of the adjustable flow valve.

[0036] The adjustable flow valve outputs a precise small flow rate of oil (target flow rate 1-2L / Min) from the adjustable flow port B according to the set adjustment stroke (0-6L / Min). The flow rate supplies oil to the water pump motor through the P port and the B port of the solenoid valve group, driving the motor to work.

[0037] 2. Load feedback closed-loop control:

[0038] The load pressure generated when the water pump motor is working is applied to the x port of the load-sensitive pump through the internal channels of the check valve and the load-sensitive valve.

[0039] The x port serves as a load feedback interface, enabling the load-sensitive pump to enter a "load state" and maintain a constant flow of oil supply from the load-sensitive pump to the water pump motor (to offset the effects of system pressure fluctuations).

[0040] 4. Accuracy Guarantee Mechanism:

[0041] The independent adjustment function of the adjustable flow valve avoids the valve core adjustment error caused by the original load-sensitive valve having an excessively large orifice diameter (90L / Min).

[0042] The check valve ensures that the load pressure is transmitted to port X in only one direction, preventing oil backflow from interfering with the main oil circuit, and at the same time, it achieves stable control of small flow rates through closed-loop feedback.

[0043] This utility model embodiment features parallel independent branches: the small-flow oil supply branch is connected in parallel with the main oil circuit, and the on / off state is switched by a solenoid valve group, so that they do not interfere with each other.

[0044] This utility model embodiment adopts a dedicated load feedback path: the load pressure of the water pump motor is received independently through the x port to achieve precise closed-loop control in low flow scenarios, which is different from the conventional load feedback of the main oil circuit.

[0045] In this embodiment of the invention, the components work together: the adjustable flow valve (precision control), the solenoid valve group (on / off control), the check valve (pressure transmission), and the x-port (feedback regulation) work together to solve the problem of poor accuracy of low-flow oil supply in the original system.

[0046] The foregoing has shown and described the basic principles of the present invention. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-flow oil supply device based on a load-sensitive system, comprising a load-sensitive pump, a load-sensitive valve, an actuator, and a water pump motor, characterized in that: It also includes an adjustable flow valve, a solenoid valve assembly, and a check valve; the output end of the load-sensitive pump is connected to the input end of the load-sensitive valve, the first output end of the load-sensitive valve is connected to the actuator, the second output end of the load-sensitive valve is sequentially connected to the input ends of the adjustable flow valve and the solenoid valve assembly, the solenoid valve assembly is connected to the water pump motor, the output end of the water pump motor is connected to the internal channel of the load-sensitive valve through the check valve, and the internal channel is connected to the x-port of the load-sensitive pump.

2. The low-flow oil supply device based on a load-sensitive system according to claim 1, characterized in that: The adjustable flow valve has an adjustment stroke of 0-6 L / min.

3. The low-flow oil supply device based on a load-sensitive system according to claim 1, characterized in that: The solenoid valve assembly has a de-energized state and an energized state. In the de-energized state, the output pressure of the load-sensitive pump acts on port A of the solenoid valve assembly, blocking port A and stopping the oil supply to the water pump motor. Simultaneously, port P of the water pump motor is connected to the return oil, and the water pump motor stops working due to the lack of pressure at port P. In the energized state, the output pressure of the load-sensitive pump acts on port A of the adjustable flow valve, and the adjustable flow valve outputs flow from port B according to the calibrated flow rate. The flow rate supplies oil to the water pump motor through ports P and B of the solenoid valve assembly.

4. A low-flow oil supply device based on a load-sensitive system according to claim 3, characterized in that: The one-way valve transmits the load pressure of the water pump motor during operation to the internal channel of the load-sensitive valve, and acts on the x port of the load-sensitive pump. The load-sensitive pump is in a loaded state and supplies oil to the water pump motor at a constant flow rate.

5. A low-flow oil supply device based on a load-sensitive system according to claim 1, characterized in that: There are several actuators, and each actuator is connected to the first output terminal of the load-sensitive valve.

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