Heavy hammer energy accumulator combined type hydraulic system

Abstract

The invention relates to the technical field of valve hydraulic control, and discloses a heavy hammer energy accumulator combined type hydraulic system which solves the problems in the background technology and is characterized in that a pure heavy hammer valve closing loop, an energy accumulator auxiliary valve closing loop and a valve opening and pressure maintaining loop which are mutually independent are arranged. The pure heavy hammer valve closing loop enables the system to safely close the valve only by the potential energy of the heavy hammer when the system is normal or is powered off. And the energy accumulator auxiliary valve closing loop can superpose the pressure energy stored by the energy accumulator and the potential energy of the heavy hammer to jointly drive the valve to be closed when quick or larger closing force is needed. The valve opening and pressure maintaining loop is responsible for providing pressure oil to open the valve and providing stable holding force after the valve reaches a full-open position. According to the system, flexible switching and reliable isolation of three working modes are achieved through specific connection and control of elements such as the electromagnetic valves, the hydraulic control one-way valves and the stop valves, and the safety, reliability and working condition adaptability of valve driving are comprehensively improved.

Description

Technical Field

[0001] This invention relates to the field of valve hydraulic control technology, specifically to a combined hydraulic system with a counterweight accumulator. Background Technology

[0002] In a counterweight valve, the closing force is typically provided by the potential energy of the counterweight. However, after the valve has been running for a long time, the closing torque increases due to increased friction, obstruction by minor foreign objects, or other reasons. Meanwhile, the closing torque provided by the counterweight remains essentially unchanged, which means the valve cannot be closed solely by the counterweight. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides the following technical solution: a weighted accumulator composite hydraulic system, comprising a pure weighted valve closing circuit, an accumulator-assisted valve closing circuit, and a valve opening and pressure holding circuit; the pure weighted valve closing circuit is configured to use only the potential energy of the weighted hammer to drive the piston rod of the main cylinder to retract when the valve is closed; the accumulator-assisted valve closing circuit is configured to use the pressure oil stored in the accumulator and the potential energy of the weighted hammer to jointly drive the piston rod to retract when the valve is closed; the valve opening and pressure holding circuit is configured to drive the piston rod to extend to open the valve and provide holding force at the fully open position, wherein the pure weighted valve closing circuit and the accumulator-assisted valve closing circuit are independent of each other.

[0004] Furthermore, the pure counterweight valve-closing circuit includes a first solenoid valve and a first hydraulically controlled check valve. When the first solenoid valve is energized, it controls the first hydraulically controlled check valve to reverse the flow. The outlet of the first hydraulically controlled check valve is connected to a first branch and a second branch in parallel. The first branch is equipped with a first check valve and leads to the oil tank. The second branch is equipped with a second check valve and leads to the rod chamber of the main cylinder. The opening pressure of the first check valve is greater than the opening pressure of the second check valve.

[0005] Furthermore, a first shut-off valve for isolating the circuit is provided on the node oil line connecting the outlet of the first hydraulic check valve to the first branch and the second branch.

[0006] Furthermore, the accumulator auxiliary valve closing circuit includes a second solenoid valve, a second hydraulically controlled check valve, a third solenoid valve, and a third hydraulically controlled check valve; when the second solenoid valve is energized, it controls the second hydraulically controlled check valve to open in reverse, and at the same time, the first control position of the third solenoid valve is energized, so that the pressure oil of the accumulator enters the rod chamber of the main cylinder through the third hydraulically controlled check valve.

[0007] Furthermore, a second shut-off valve is installed on the main oil line between the accumulator group and the system return oil tank to release pressure or isolate the accumulator.

[0008] Furthermore, the valve opening and pressure holding circuit includes a second solenoid valve, a second hydraulically controlled check valve, a third solenoid valve, a third hydraulically controlled check valve, a one-way throttle valve, a fourth solenoid valve, and a fourth check valve. When opening the valve, the second solenoid valve is energized, causing the second hydraulically controlled check valve to reverse the flow. At the same time, the second control position of the third solenoid valve is energized, and the pressure oil enters the rodless chamber of the main cylinder through the third hydraulically controlled check valve and the one-way throttle valve. When holding the pressure, the fourth solenoid valve is energized, and the pressure oil of the accumulator is connected to the rodless chamber through the fourth check valve.

[0009] Furthermore, the pressure oil source in the valve opening and pressure holding circuit can be selected as an accumulator or an oil pump motor unit.

[0010] Furthermore, the first hydraulically controlled check valve can be replaced by a two-way cartridge valve.

[0011] Furthermore, the hydraulic system also includes an oil tank for supplying oil to each circuit, an oil pump motor unit, an accumulator unit, automated instruments, and auxiliary components.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The system features two modes: pure counterweight closure and accumulator-assisted closure. Under normal operating conditions, the system relies on the potential energy of the counterweight to smoothly close the valve, ensuring energy efficiency and reliability. In emergencies, the accumulator quickly intervenes, providing additional power to achieve rapid valve closure and ensuring system safety. The pure counterweight circuit and the accumulator-assisted circuit are independent of each other and do not interfere with each other. When one circuit fails, the other circuit can still independently complete the valve closure action, significantly improving the system's redundancy safety and overall reliability. After the valve is opened, the system can automatically switch to the accumulator pressure-holding mode to continuously compensate for internal leakage, ensuring that the valve remains stably held in the fully open position for a long period, preventing accidental closure and ensuring process continuity. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the hydraulic control circuit of the composite hydraulic system of the hammer accumulator of the present invention.

[0016] In the diagram: 1. First solenoid valve; 2. First hydraulically controlled check valve; 3. First check valve; 4. Second check valve; 5. First shut-off valve; 6. Second solenoid valve; 7. Second hydraulically controlled check valve; 8. Third solenoid valve; 9. Third hydraulically controlled check valve; 10. Second shut-off valve; 11. One-way throttle valve; 12. Fourth solenoid valve; 13. Fourth check valve; 100. Oil tank; 200. Main cylinder; 300. Accumulator group; 400. Oil pump motor group. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, it includes a pure weight-operated valve closing circuit, an accumulator-assisted valve closing circuit, and a valve opening and pressure holding circuit. The pure weight-operated valve closing circuit is configured to use only the potential energy of the weight to drive the piston rod of the main cylinder 200 back when the valve is closed. The accumulator-assisted valve closing circuit is configured to use the pressure oil stored in the accumulator and the potential energy of the weight to drive the piston rod back when the valve is closed. The valve opening and pressure holding circuit is configured to drive the piston rod to extend to open the valve and provide holding force in the fully open position of the valve. The pure weight-operated valve closing circuit and the accumulator-assisted valve closing circuit are independent of each other.

[0019] The pure counterweight valve closing circuit includes a first solenoid valve 1 and a first hydraulically controlled check valve 2. When the first solenoid valve 1 is energized, it controls the first hydraulically controlled check valve 2 to conduct in the reverse direction. The outlet of the first hydraulically controlled check valve 2 is connected to a first branch and a second branch in parallel. The first branch is equipped with a first check valve 3 and leads to the oil tank 100. The second branch is equipped with a second check valve 4 and leads to the rod chamber of the main cylinder 200. The opening pressure of the first check valve 3 is greater than that of the second check valve 4. Through the parallel design of the first check valve 3 (higher opening pressure) and the second check valve 4 (lower opening pressure), the second check valve 4 provides lower resistance in the initial stage of valve closing, which accelerates the counterweight. In the later stage of valve closing, the first check valve 3 opens, and the return oil needs to overcome a higher back pressure, thus forming a valve closing characteristic of fast at first and slow later, avoiding valve impact.

[0020] On the node oil line connecting the outlet of the first hydraulic check valve 2 to the first branch and the second branch, a first shut-off valve 5 is installed to isolate the circuit. The first shut-off valve 5 can manually isolate the circuit during maintenance or failure, thereby improving the safety of system maintenance.

[0021] The accumulator auxiliary valve closing circuit includes a second solenoid valve 6, a second hydraulically controlled check valve 7, a third solenoid valve 8, and a third hydraulically controlled check valve 9. When the second solenoid valve 6 is energized, it controls the second hydraulically controlled check valve 7 to open in the reverse direction. At the same time, the first control position of the third solenoid valve 8 is energized, so that the pressure oil of the accumulator enters the rod chamber of the main cylinder 200 through the third hydraulically controlled check valve 9. Based on the potential energy of the counterweight, the pressure oil of the accumulator drives the valve. This circuit is suitable for large-diameter or high-pressure differential valves that require greater valve closing force.

[0022] On the main oil line between the accumulator group 300 and the system return oil tank 100, a second shut-off valve 10 is provided for releasing pressure or isolating the accumulator. The second shut-off valve 10 can manually release the accumulator pressure for easy maintenance or emergency isolation.

[0023] The valve opening and pressure holding circuit includes a second solenoid valve 6, a second hydraulically controlled check valve 7, a third solenoid valve 8, a third hydraulically controlled check valve 9, a one-way throttle valve 11, a fourth solenoid valve 12, and a fourth check valve 13. When opening the valve, the second solenoid valve 6 is energized, causing the second hydraulically controlled check valve 7 to reverse the flow. At the same time, the second control position of the third solenoid valve 8 is energized, and the pressure oil enters the rodless chamber of the main cylinder 200 through the third hydraulically controlled check valve 9 and the one-way throttle valve 11. When holding the pressure, the fourth solenoid valve 12 is energized, and the pressure oil from the accumulator is connected to the rodless chamber through the fourth check valve 13. The one-way throttle valve 11 can adjust the flow rate into the rodless chamber to achieve smooth valve opening and avoid water hammer or impact.

[0024] The pressure oil source in the valve opening and pressure holding circuit can be selected as an accumulator or an oil pump motor unit 400 to adapt to different working conditions, such as using an accumulator in emergency situations and an oil pump in normal situations.

[0025] The first hydraulic control check valve 2 can be replaced by a two-way cartridge valve to improve flow capacity and is suitable for high flow conditions; the cartridge valve has a compact structure, good sealing performance, and is easy to integrate and maintain.

[0026] The hydraulic system also includes an oil tank 100 for supplying oil to each circuit, an oil pump motor unit 400, an accumulator unit 300, automated instruments and accessories.

[0027] Working principle:

[0028] The main actuator of this system is the main hydraulic cylinder 200, which drives the valve. Its piston rod extends to open the corresponding valve and retracts to close the corresponding valve. The counterweight is mechanically connected to the piston rod of the hydraulic cylinder or the valve plate to provide a constant potential energy for valve closing.

[0029] Normal operating conditions (purely gravity-based valve closure):

[0030] When the control system issues a normal valve closing command, the first solenoid valve 1 is energized. The control oil pressure opens the first hydraulically controlled check valve 2. Oil in the rodless chamber of the main cylinder 200 flows out under the drive of the falling weight, first passing through the first hydraulically controlled check valve 2. Then, the oil path splits into two branches: due to the lower opening pressure of the second check valve 4, most of the oil preferentially flows through this valve into the rod chamber of the main cylinder 200 to fill the volume gap created by the piston rod retraction; simultaneously, some oil overcomes the higher opening pressure of the first check valve 3 and is discharged back into the oil tank 100. By adjusting the back pressure set by the first check valve 3, the valve closing speed can be controlled. The entire process does not consume accumulator pressure oil, but is completed solely by gravitational potential energy, achieving energy-saving, reliable, and smooth valve closing.

[0031] Emergency Operation (Accumulator-Assisted Rapid Valve Closure):

[0032] When an emergency, rapid valve closure is required, the first control positions (e.g., the first electromagnet) of the second solenoid valve 6 and the third solenoid valve 8 are simultaneously energized. The second solenoid valve 6 activates, causing the second hydraulic check valve 7 to reverse, opening the main passage for pressurized oil to enter the rod chamber of the main cylinder 200. The third solenoid valve 8 switches to the corresponding position, directing the high-pressure oil from the accumulator group 300 to the rod chamber inlet. The high-pressure oil from the accumulator rapidly enters the rod chamber, generating a powerful additional thrust that combines with the potential energy of the counterweight to drive the piston rod to retract rapidly. Simultaneously, the oil in the rodless chamber of the main cylinder 200 is rapidly discharged and flows back to the oil tank 100 via the corresponding circuit, thus achieving rapid and reliable valve closure to handle emergency situations.

[0033] Valve opening and pressure holding conditions:

[0034] When the valve is opened, the second control position (e.g., the second electromagnet) of the second solenoid valve 6 and the third solenoid valve 8 is energized. The second solenoid valve 6 activates, causing the second hydraulically controlled check valve 7 to reverse. The third solenoid valve 8 switches the oil circuit, allowing pressurized oil (which may come from the oil pump motor unit 400 or the accumulator unit 300) to enter the rodless chamber of the main oil cylinder 200 through the third hydraulically controlled check valve 9 and the one-way throttle valve 11, pushing the piston rod to extend and open the valve. The valve opening speed can be adjusted by the one-way throttle valve 11.

[0035] Once the valve reaches and stabilizes in the fully open position, the fourth solenoid valve 12 is energized and conducts. The pressure oil circuit of the accumulator group 300 is connected to the rodless chamber pipeline of the main cylinder 200 through the fourth check valve 13. As a pressure stabilizing source for the system, the accumulator can continuously compensate for the pressure drop in the rodless chamber circuit caused by minor internal leakage of various hydraulic components, thereby ensuring that the valve is stably and reliably held in the fully open position.

[0036] The various shut-off valves in the system are used to isolate different functional circuits or components, facilitating system commissioning and maintenance. Automated instruments are used to monitor key parameters such as system pressure and valve position, and feed the signals back to the control system to achieve automated operation and protection.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A combined hydraulic system with a counterweight accumulator, characterized in that, It includes a pure weight-operated valve closing circuit, an accumulator-assisted valve closing circuit, and a valve opening and pressure holding circuit. The pure weight-operated valve closing circuit is configured to use only the potential energy of the weight to drive the piston rod of the main cylinder (200) to retract when the valve is closed. The accumulator-assisted valve closing circuit is configured to use the pressure oil stored in the accumulator and the potential energy of the weight to jointly drive the piston rod to retract when the valve is closed. The valve opening and pressure holding circuit is configured to drive the piston rod to extend to open the valve and provide holding force in the fully open position of the valve. The pure weight-operated valve closing circuit and the accumulator-assisted valve closing circuit are independent of each other.

2. The combined hydraulic system of the accumulator and counterweight as described in claim 1, characterized in that: The pure weight valve closing circuit includes a first solenoid valve (1) and a first hydraulic check valve (2). When the first solenoid valve (1) is energized, it controls the first hydraulic check valve (2) to conduct in reverse. The outlet of the first hydraulic check valve (2) is connected to a first branch and a second branch in parallel. The first branch is provided with a first check valve (3) and leads to the oil tank (100). The second branch is provided with a second check valve (4) and leads to the rod chamber of the main cylinder (200). The opening pressure of the first check valve (3) is greater than the opening pressure of the second check valve (4).

3. The combined hydraulic system of the accumulator and counterweight as described in claim 2, characterized in that: A first shut-off valve (5) is provided on the node oil line where the outlet of the first hydraulic check valve (2) is connected to the first branch and the second branch to isolate the circuit.

4. The combined hydraulic system with a counterweight accumulator according to claim 1, characterized in that: The accumulator auxiliary valve closing circuit includes a second solenoid valve (6), a second hydraulic control check valve (7), a third solenoid valve (8), and a third hydraulic control check valve (9). When the second solenoid valve (6) is energized, it controls the second hydraulic control check valve (7) to open in reverse. At the same time, the first control position of the third solenoid valve (8) is energized, so that the pressure oil of the accumulator enters the rod chamber of the main cylinder (200) through the third hydraulic control check valve (9).

5. The combined hydraulic system of the counterweight accumulator according to claim 1 or 4, characterized in that: A second shut-off valve (10) is provided on the main oil line between the accumulator group (300) and the system return oil tank (100) for releasing pressure or isolating the accumulator.

6. The combined hydraulic system of the counterweight accumulator according to claim 1, characterized in that: The valve opening and pressure holding circuit includes a second solenoid valve (6), a second hydraulic control check valve (7), a third solenoid valve (8), a third hydraulic control check valve (9), a one-way throttle valve (11), a fourth solenoid valve (12), and a fourth check valve (13). When the valve is opened, the second solenoid valve (6) is energized to reverse the flow of the second hydraulic control check valve (7), and at the same time, the second control position of the third solenoid valve (8) is energized, and the pressure oil enters the rodless chamber of the main cylinder (200) through the third hydraulic control check valve (9) and the one-way throttle valve (11). When the pressure is held, the fourth solenoid valve (12) is energized, and the pressure oil of the accumulator is connected to the rodless chamber through the fourth check valve (13).

7. The combined hydraulic system of the counterweight accumulator according to claim 6, characterized in that: The pressure oil source in the valve opening and pressure holding circuit can be selected as an accumulator or an oil pump motor unit (400).

8. The combined hydraulic system of the accumulator and counterweight as described in claim 2, characterized in that: The first hydraulic control check valve (2) can be replaced by a two-way cartridge valve.

9. The combined hydraulic system of the counterweight accumulator according to claim 1, characterized in that: The hydraulic system also includes an oil tank (100) for supplying oil to each circuit, an oil pump motor unit (400), an accumulator unit (300), automated instruments and accessories.

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