High-pressure oil source system for large-range high-precision flow control

Abstract

The present application relates to a kind of oil source systems, in particular to a kind of high-pressure oil source systems of large interval high-precision flow control, including multiple pressurizing unit groups, multiple accumulators, multiple through-flow valve groups, proportional flow valve group, output header, each described accumulator is connected with power station for filling hydraulic oil, one described pressurizing unit group is used to pressurize one described accumulator, each described accumulator is respectively connected with the input end of the proportional flow valve group by a first connecting branch pipe, each described first connecting branch pipe is respectively provided with one described through-flow valve group, the output end of the proportional flow valve group is connected the output header, the proportional flow valve group includes multiple branch, each described branch is respectively provided with one proportional flow valve of different flow, each described branch is connected with the output header.The present application can meet the demand of high pressure, large flow oil liquid.

Description

Technical Field

[0001] This invention relates to an oil source system, and more particularly to a high-pressure oil source system with high-precision flow control over a large area. Background Technology

[0002] A certain type of high-speed, ultra-large tonnage hydraulic actuator is a large, multi-hole buffer hydraulic cylinder. According to overall specifications, this model of buffer hydraulic cylinder has a buffering force exceeding 200 tons, corresponding to a maximum flow rate of 4000 L / min, a maximum working pressure of 25 MPa, and a maximum operating speed of no less than 4 m / s. Under these loads and speeds, if an external loading cylinder is used for testing and verification, the loading cylinder and power source would be too large, making the existing testing system insufficient. To address the limitations of the existing testing system, based on the original buffer hydraulic cylinder, the flow capacity of its core buffering force generating element, the damping rod, is tested. The internal piston and piston rod are fixed in different positions using external tooling. Oil ports are opened in both the positive and negative chambers of the cylinder, with the negative chamber connected to the oil source and the positive chamber connected to the return oil. By inputting a large flow rate for a short time and observing the pressure change at the input end, the buffering effect of the buffer hydraulic cylinder in different positions can be determined. However, achieving a hydraulic oil source of 4000 L / min and 25 MPa remains quite challenging for general oil sources. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a high-pressure oil source system that can meet the requirements of high pressure and large flow rate oil with high precision flow control over a large range.

[0004] To address the aforementioned technical problems, this application provides the following technical solution: This invention discloses a high-pressure oil source system for large-area high-precision flow control, comprising multiple booster unit groups, multiple accumulators, multiple flow-passing valve groups, proportional flow valve groups, and an output main pipe. The booster unit groups, accumulators, and flow-passing valve groups are one-to-one. Each accumulator is connected to a power station for charging hydraulic oil. One booster unit group pressurizes one accumulator. Each accumulator is connected to the input end of the proportional flow valve group via a first connecting branch pipe. Each first connecting branch pipe is equipped with a flow-passing valve group, which includes a switching valve. The output end of the proportional flow valve group is connected to the output main pipe. The proportional flow valve group includes multiple branches, each branch equipped with a proportional flow valve with a different flow rate. Each branch is connected to the output main pipe.

[0005] Furthermore, the pressurization unit group includes multiple nitrogen cylinders arranged in parallel, and each nitrogen cylinder is equipped with an inflation valve.

[0006] Furthermore, a displacement sensor is installed inside the energy storage device.

[0007] Furthermore, the flow valve assembly also includes a check valve.

[0008] Furthermore, it also includes a main oil supply pipe and multiple branch oil supply pipes. The switching valve is a two-way cartridge valve. One end of the main oil supply pipe is connected to the power station, and the other end is connected to one end of each of the multiple branch oil supply pipes. The other end of each branch oil supply pipe is connected to one of the aforementioned two-way cartridge valves. The power station supplies oil to the accumulator through the main oil supply pipe, each branch oil supply pipe, each two-way cartridge valve, and each of the first connecting branch pipes.

[0009] Furthermore, it also includes a flow measurement component connected to the output manifold for measuring the hydraulic oil flow rate through the proportional flow valve assembly.

[0010] Furthermore, the flow measurement component includes multiple flow measurement branch pipes, one end of which is connected to the output main pipe and the other end is used to connect to the oil supply component of the high-pressure oil source system. Each flow measurement branch pipe is equipped with a flow meter and a shut-off valve connected in series.

[0011] Furthermore, the flow meter is a turbine flow meter, and the shut-off valve is a manual shut-off valve.

[0012] Furthermore, a switching valve is provided between each nitrogen cylinder and the accumulator corresponding to the nitrogen cylinder.

[0013] Furthermore, it also includes a control system. The displacement sensor, the proportional flow valve, and the flow meter are all connected to the control system. The displacement sensor collects the piston displacement information of the accumulator and transmits it to the control system. The flow meter collects the flow parameters of each flow measurement branch and transmits them to the control system. The control system converts the piston displacement information of the accumulator into instantaneous flow parameters, compares the instantaneous flow parameters and the flow parameters of the flow measurement branches with the preset target flow, and controls the opening and closing of different proportional flow valves according to the comparison results.

[0014] Compared with existing technologies, the high-pressure oil source system with large-area high-precision flow control of the present invention has at least the following beneficial effects: This invention discloses a high-pressure oil source system with high-precision flow control over a large area. It comprises multiple booster units, multiple accumulators, multiple flow valve groups, and proportional flow valve groups. Each proportional flow valve group has multiple branches, each equipped with a proportional flow valve of a different flow rate. Therefore, in practical use, the booster units can pressurize the accumulators. Furthermore, due to significant differences in various test conditions, multiple proportional flow valves with different flow rates are grouped for control. When the flow rate is low, the small-flow proportional flow valve is controlled, while the large-flow proportional flow valve is closed. Conversely, when the flow rate is high, the large-flow proportional flow valve is controlled, while the small-flow proportional flow valve is closed. This achieves the required flow rate, meeting the high-pressure, high-flow requirements of damping characteristic tests for buffer pressure cylinder damping rods or other application scenarios.

[0015] The high-pressure oil source system for large-area high-precision flow control of the present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 A schematic diagram of a large porous buffer pressure cylinder; Figure 2 This is a hydraulic schematic diagram of the high-pressure oil source system for large-area high-precision flow control according to the present invention. Figure 3 This is a block diagram illustrating the principle of using the high-pressure oil source system for high-precision flow control in a large area as an oil source to test the damping characteristics of the damping rod of a buffer pressure cylinder. Detailed Implementation

[0017] A certain type of high-speed, ultra-large tonnage hydraulic actuator is a large, multi-hole buffer hydraulic cylinder, such as... Figure 1 As shown, when an external speed input acts on the connecting plate 921, the piston rod 92 and the inner piston 922 begin to move. The oil in the reverse cavity of the inner cylinder 96 is compressed and flows into the replenishing cavity through the damping holes 961 on the inner cylinder 96. Depending on the operating position of the piston rod 92, the number of damping holes 961 through which the oil in the reverse cavity 99 flows into the replenishing cavity 98 varies. The larger the stroke X, the fewer the number of damping holes 961. Because the external load is buffered and the speed is reduced, a reset device 931 is provided between the outer piston 93 and the outer cylinder 94. Therefore, throughout the entire buffering stroke, the buffering force is stabilized within a small range, achieving a relatively ideal buffering effect.

[0018] like Figure 2As shown, the present invention discloses a high-pressure oil source system for large-area high-precision flow control, comprising multiple booster unit groups 01, multiple accumulators 02, multiple flow valve groups 03, proportional flow valve groups 04, and an output main pipe 05. The booster unit groups 01, accumulators 02, and flow valve groups 03 correspond one-to-one. Each accumulator 02 is connected to a power station 07 for charging hydraulic oil. One booster unit group 01 is used to boost the pressure of one accumulator 02. Each accumulator 02 is connected to the input end of the proportional flow valve group 04 through a first connecting branch pipe 21. Each first connecting branch pipe 21 is provided with a flow valve group 03, which includes a switching valve 31. The output end of the proportional flow valve group 04 is connected to the output main pipe 05. The proportional flow valve group 04 includes multiple branches, each branch being provided with a proportional flow valve 41 with a different flow rate. Each branch is connected to the output main pipe 05. In this embodiment, four pressurization unit groups 01 are provided, each including four nitrogen cylinders 11 with a total volume of 2000L. Before use, the nitrogen cylinders 11 are pre-charged to a pressure of 20MPa by an external air source. Four accumulators 02 are provided with a total volume of 1000L. Three proportional flow valve groups 04 are provided with diameters of 16, 32, and 50 mm, and maximum flow rates of 600 L / min, 1800 L / min, and 5500 L / min, respectively. After the nitrogen cylinders 11 are filled with nitrogen, hydraulic oil is injected into the accumulators 02 through the external power station 07. When the switch valve 31 is closed, the accumulators 02 cannot be connected to the output main pipe 05 through the proportional flow valve group 04. This invention provides a high-pressure oil source system with large-range high-precision flow control, which can be used to provide an oil source for the damping characteristic test of the damping rod of a buffer hydraulic cylinder. In addition to being used for the damping characteristic test of the damping rod of a buffer hydraulic cylinder, it can also be used as an oil source for other short-term high-pressure and high-flow tests. Taking the provision of an oil source for testing the damping characteristics of a buffer pressure cylinder damping rod as an example, such as... Figure 1As shown, the test piece, namely the damping rod 09 of the buffer hydraulic cylinder, is connected to the output main pipe 05. First, the accumulator liquid chamber is filled with oil to the predetermined pressure using a conventional oil source to realize the energy storage of the accumulator 02. During the test, the pressure is increased to the accumulator 02 through the pressure boosting unit group 01 to realize the large flow output of the accumulator 02. After the test, the hydraulic oil returns to the power station 07 through the return oil pipe 91. This invention discloses a high-pressure oil source system with high-precision flow control over a large area. It comprises multiple booster unit groups 01, multiple accumulators 02, multiple flow valve groups 03, and proportional flow valve groups 04. Each proportional flow valve group 04 has multiple branches, each equipped with a proportional flow valve 41 with a different flow rate. Therefore, in practical use, the booster unit groups 01 can boost the pressure of the accumulators 02. Simultaneously, due to significant differences in various test conditions, multiple proportional flow valves with different flow rates are grouped for control. When the flow rate is low, the small-flow proportional flow valve is controlled, while the large-flow proportional flow valve is closed. Conversely, when the flow rate is high, the large-flow proportional flow valve is controlled, while the small-flow proportional flow valve is closed, thereby obtaining the required flow rate to meet the high-pressure, high-flow requirements of damping characteristic tests for buffer pressure cylinder damping rods or other application scenarios.

[0019] Optionally, the pressurization unit group 01 includes multiple nitrogen cylinders 11 arranged in parallel, and each nitrogen cylinder 11 is provided with an inflation valve. Specifically, the inflation valve is located at the bottom of the nitrogen cylinder 11.

[0020] Optionally, a displacement sensor is installed inside the accumulator 02. The displacement of the accumulator 02 can be fed back to the control system in real time through the displacement sensor, which facilitates flow control.

[0021] Optionally, the flow valve assembly 03 also includes a one-way valve 32, which is connected in series with the switching valve 31. By setting the one-way valve 32, it is ensured that there is no oil leakage between the accumulators 02 during the oil discharge process.

[0022] Optionally, it also includes a main oil supply pipe 71 and multiple oil supply branch pipes 72. The switch valve 31 is a two-way cartridge valve. One end of the main oil supply pipe 71 is connected to the power station 07, and the other end is connected to one end of multiple oil supply branch pipes 72 respectively. The other end of each oil supply branch pipe 72 is connected to a two-way cartridge valve. The power station 07 supplies oil to the accumulator 02 through the main oil supply pipe 71, each oil supply branch pipe 72, each two-way cartridge valve, and each first connecting branch pipe 21.

[0023] Optionally, it also includes a flow measurement component 08, which is connected to the output main pipe 05 and is used to measure the hydraulic oil flow through the proportional flow valve group 04 to ensure that the oil flow meets the usage requirements.

[0024] Optionally, the flow measurement component 08 includes multiple flow measurement branch pipes 81. One end of each flow measurement branch pipe 81 is connected to the output main pipe 05, and the other end is used to connect to the damping rod of the buffer pressure cylinder or other high-pressure, high-flow applications. Each flow measurement branch pipe 81 is equipped with a flow meter 82 connected in series and a shut-off valve 83. By switching the state of the shut-off valve 83 for different flow inputs, different numbers of flow meters can be activated to conduct flow tests, confirming that the oil flow meets product requirements and improving flow control accuracy.

[0025] Optionally, the flow meter 82 is a high-precision turbine flow meter, and the shut-off valve 83 is a manual shut-off valve.

[0026] Optionally, during the nitrogen replenishment process, a safety valve group is set up for each group to control the on / off of the accumulator and facilitate the depressurization and oil discharge of the accumulator. A safety shut-off valve is set in front of each group of nitrogen cylinders to facilitate the replacement of nitrogen cylinders and maintenance. A high-pressure large-diameter ball valve is set in front of the valve group to facilitate the replacement and maintenance of the accumulator group.

[0027] Optionally, the system also includes a control system. The displacement sensor, proportional flow valve 41, and flow meter 82 are all connected to the control system. The displacement sensor collects the piston displacement information of the accumulator 02 and transmits it to the control system. The control system obtains the instantaneous flow parameters by calculating the real-time piston displacement. The flow meter 82 transmits the flow parameters of each flow measurement branch pipe 81 to the control system. The control system compares the instantaneous flow parameters and the flow parameters of each flow measurement branch pipe 81 with the preset target flow. Based on the comparison results, it controls the opening and closing of different proportional flow valves 41. When the flow is small, the small flow proportional flow valve is controlled to control the flow, and the large flow proportional flow valve is closed. When the flow is large, the large flow proportional flow valve is controlled to control the flow, and the small flow proportional flow valve is closed. The control system, proportional flow valve, displacement sensor, and flow meter 82 form a closed-loop control, thereby realizing high-precision flow control of the system. A symmetrical pipeline layout is adopted, and the six sets of pipelines are basically the same length, which can realize synchronous oil supply in the pipeline and stable and accurate flow output.

[0028] like Figure 3 As shown, when the high-pressure oil source system with large-area high-precision flow control of the present invention is used to provide oil source for the damping characteristic test of the damping rod of the buffer pressure cylinder, the test process is controlled by the oil source servo control system, and the specific control process is as follows: The oil source servo control system includes a servo control unit, a data acquisition unit, and displacement and flow measurement units. The data acquisition unit acquires pressure data from the pressure sensor of the buffer cylinder and flow data through the buffer cylinder; the acquisition card operates at a frequency of no less than 20kHz. The displacement sensor and flow meter 82 are flow measurement units. The servo control unit achieves continuous and stable constant output of each flow level for more than 5 seconds through servo control, with the error between the measured flow value and the target flow value not exceeding ±5%. A large constant flow output is achieved by setting the test target flow rate on the screen. The entire process is controlled by a program and automatically completes the process control. Simultaneously, the data is transmitted to the signal acquisition system for data storage, curve plotting, and control monitoring. An oil collection tank is reserved at the bottom of the frame for centralized treatment of oil leaks generated during component replacement.

[0029] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A high-pressure oil source system with high-precision flow control over a large area, characterized in that, It includes multiple booster unit groups (01), multiple accumulators (02), multiple flow valve groups (03), proportional flow valve groups (04), and an output manifold (05). The booster unit groups (01), the accumulators (02), and the flow valve groups (03) correspond one-to-one. Each accumulator (02) is connected to a power station (07) for charging hydraulic oil. One booster unit group (01) is used to boost the pressure of one accumulator (02). Each accumulator (02) is connected to a first connecting branch. Pipe (21) is connected to the input end of the proportional flow valve group (04). Each of the first connecting branch pipes (21) is provided with a flow valve group (03). The flow valve group (03) includes a switching valve (31). The output end of the proportional flow valve group (04) is connected to the output main pipe (05). The proportional flow valve group (04) includes multiple branches. Each branch is provided with a proportional flow valve (41) with a different flow rate. Each branch is connected to the output main pipe (05).

2. The high-pressure oil source system for large-area high-precision flow control according to claim 1, characterized in that, The pressurization unit group (01) includes multiple nitrogen cylinders (11) arranged in parallel, and each nitrogen cylinder (11) is provided with an inflation valve.

3. The high-pressure oil source system for large-area high-precision flow control according to claim 2, characterized in that, The energy storage device (02) is equipped with a displacement sensor.

4. The high-pressure oil source system for large-area high-precision flow control according to claim 3, characterized in that, The flow valve assembly (03) also includes a check valve (32).

5. The high-pressure oil source system for large-area high-precision flow control according to claim 4, characterized in that, It also includes a main oil supply pipe (71) and multiple oil supply branch pipes (72). The switch valve (31) is a two-way cartridge valve. One end of the main oil supply pipe (71) is connected to the power station (07), and the other end is connected to one end of multiple oil supply branch pipes (72). The other end of each oil supply branch pipe (72) is connected to one of the two-way cartridge valves mentioned above. The power station (07) supplies oil to the accumulator (02) through the main oil supply pipe (71), each oil supply branch pipe (72), each two-way cartridge valve, and each first connecting branch pipe (21).

6. The high-pressure oil source system for large-area high-precision flow control according to claim 5, characterized in that, It also includes a flow measurement component (08), which is connected to the output manifold (05) and is used to measure the flow rate of hydraulic oil through the proportional flow valve group (04).

7. The high-pressure oil source system for large-area high-precision flow control according to claim 6, characterized in that, The flow measurement component (08) includes multiple flow measurement branch pipes (81). One end of each flow measurement branch pipe (81) is connected to the output main pipe (05), and the other end is used to connect to the oil supply component of the high-pressure oil source system. Each flow measurement branch pipe (81) is equipped with a flow meter (82) and a shut-off valve (83) connected in series.

8. The high-pressure oil source system for large-area high-precision flow control according to claim 7, characterized in that, The flow meter (82) is a turbine flow meter, and the shut-off valve (83) is a manual shut-off valve.

9. The high-pressure oil source system for large-area high-precision flow control according to claim 8, characterized in that, A switching valve is provided between each of the nitrogen cylinders (11) and the accumulator (02) corresponding to the nitrogen cylinder (11).

10. The high-pressure oil source system for large-area high-precision flow control according to claim 9, characterized in that, It also includes a control system. The displacement sensor, the proportional flow valve (41), and the flow meter (82) are all connected to the control system. The displacement sensor collects the piston displacement information of the accumulator (02) and transmits it to the control system. The flow meter (82) collects the flow parameters of each flow measurement branch (81) and transmits them to the control system. The control system converts the piston displacement information of the accumulator (02) into instantaneous flow parameters, compares the instantaneous flow parameters and the flow parameters of the flow measurement branch (81) with the preset target flow, and controls the opening and closing of different proportional flow valves (41) according to the comparison results.

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