External control type ultrahigh pressure proportional pressure regulating valve

Abstract

Low-pressure oil enters an inlet of a proportional overflow valve, the pressure of a low-pressure system is controlled by the proportional overflow valve, pressure oil on the low-pressure side acts on a plunger control cavity of the hydraulic control overflow valve through a pressure stabilizing damper and a one-way valve, and hydraulic pushing force generated by a plunger is transmitted to an overflow valve steel ball through a disc spring; when the force obtained by multiplying the ultrahigh pressure of the inlet of the hydraulic control overflow valve by the action area of the steel ball is equal to the pushing force of the plunger, the steel ball of the overflow valve is opened to start overflowing, and the overflow pressure of the ultrahigh pressure system can be controlled by adjusting the pressure of the proportional overflow valve of the low-pressure system. The external control type ultrahigh-pressure proportional pressure regulating valve can be used for pressure regulation of a hydraulic system with the pressure being 200 MPa or above and can be used as a proportional overflow valve of an ultrahigh-pressure hydraulic system. By arranging a hydraulic loop of two auxiliary oil ports of the external control type ultrahigh pressure proportional pressure regulating valve, the pressure rising one-way proportional regulating function, the pressure unloading function and the pressure rising / falling two-way proportional regulating function of an ultrahigh pressure system can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic transmission, and in particular to an externally controlled ultra-high pressure proportional pressure regulating valve. Background Art

[0002] The maximum pressure of the ultra-high pressure hydraulic system can currently reach over 200 MPa. In order to control the pressure of the ultra-high pressure system, a pressure regulating valve needs to be installed to serve as a relief valve or safety valve.

[0003] When using a relief valve in an ultra-high-pressure hydraulic system, the system pressure is as high as 200 MPa, and the force acting on the relief valve ball or needle valve core is over 600 N, which is much greater than the thrust that the proportional solenoid can output. Therefore, ultra-high-pressure pressure regulating valves are all manually adjusted, and thrust is generated by compressing the disc spring through the screw.

[0004] In ultra-high-pressure hydraulic systems, there is a requirement for proportional regulation of system pressure, but the current ultra-high-pressure relief valve only supports manual adjustment to a fixed value, which cannot meet the system requirements. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides an externally controlled ultra-high pressure proportional pressure regulating valve, which can proportionally regulate the pressure of an ultra-high pressure hydraulic system of the 200 MPa level.

[0006] The purpose of the present invention is achieved through the following technical solutions: An externally controlled ultra-high-pressure proportional pressure-regulating valve comprises a proportional relief valve, a pressure-stabilizing damper, a one-way valve, a hydraulically controlled relief valve, an integrated valve block, and a screw plug; the externally controlled ultra-high-pressure proportional pressure-regulating valve is a tubular connection valve, and the oil ports comprise a low-pressure side oil inlet P1, an oil return port T1, a high-pressure side oil inlet P2, an oil return port T2, a first auxiliary oil port C1, and a second auxiliary oil port C2.

[0007] The proportional relief valve is a plug-in valve structure, including a proportional electromagnet, a conical valve core, a circular valve seat, and a proportional valve sealing ring. The proportional electromagnet has a bolt hole, which is fixed to the integrated valve block by bolts and sealed by the proportional valve sealing ring. The conical valve core and the circular valve seat are installed in the internal vertical flow channel of the integrated valve block. The circular valve seat and the flow channel adopt an interference fit. Under the thrust of the proportional electromagnet, the conical valve core is tangentially matched with the inner hole of the circular valve seat. The oil inlet of the proportional relief valve is connected to the low-pressure oil inlet P1, and the oil return port of the conical valve core cavity is connected to the low-pressure oil return port T1. The pressure of the low-pressure side P1 port can be adjusted by adjusting the current of the proportional electromagnet.

[0008] The pressure-stabilizing damper is a threaded fixed damper installed in the third horizontal flow channel of the integrated valve block. The oil ports on both sides of the pressure-stabilizing damper are respectively connected to the low-pressure side oil inlet P1 and the first auxiliary oil port C1. The throttling effect on the pressure-stabilizing damper can stabilize the pressure at the C1 port.

[0009] The one-way valve includes a one-way steel ball, a steel ball base, a return spring, and a spring support. The one-way steel ball is installed in the internal flow channel of the integrated valve block. The steel ball base is used to support the one-way steel ball. The return spring is installed between the steel ball base and the spring support. The spring support is used to compress the return spring to press the steel ball. The one-way valve can allow the oil from the first auxiliary oil port C1 to flow in one direction to the second auxiliary oil port C2.

[0010] The hydraulically controlled relief valve is a cartridge-type structure, comprising a relief valve body, a spring support, a relief steel ball, a relief valve seat, a plunger, a disc spring, and a relief valve seal. The hydraulically controlled relief valve's oil inlet is connected to the high-pressure side oil inlet port P2, its oil return port is connected to the high-pressure side oil return port T2, and the oil in the plunger's operating chamber is connected to port C2.

[0011] Furthermore, the relief valve body has an external thread that is plug-connected to the internal thread on the integrated valve block. The relief valve seat is interference-fitted with the relief valve body, the relief steel ball is installed in the inner hole of the relief valve seat, and is tangentially matched with the tapered hole in the relief valve seat. The spring support is installed in the inner hole of the relief valve seat, and the upper spherical concave surface is pressed against the relief steel ball. The plunger is installed in the bottom inner hole of the relief valve body, and the disc spring is installed between the spring support and the plunger to transmit the force on the plunger to the spring support and the relief steel ball. By tightening the relief valve body, the top conical surface of the relief valve seat is pressed against the tapered inner hole in the integrated valve block to form a conical hard seal, which can ensure that the high-pressure side oil inlet P2 is reliably sealed with the oil return port T2 when the pressure is above 200MPa.

[0012] The integrated valve block is provided with a first horizontal flow channel on the left side and is coaxially connected to the low-pressure oil inlet P1, a second horizontal flow channel on the right side, a third horizontal flow channel and a fourth horizontal flow channel on the left side and are coaxially connected to the second auxiliary oil port C2, a fifth horizontal flow channel on the right side, and a first oblique flow channel on the left side and is connected to the low-pressure oil return port T1.

[0013] Furthermore, the integrated valve block is provided with a first vertical flow channel on the lower side, and a second vertical flow channel is provided on the upper side and is coaxial with the first vertical flow channel.

[0014] Further, the integrated valve block is provided with a first parallel flow channel on the front face and coaxially communicated with the first auxiliary oil port C2, a second parallel flow channel on the front face and coaxially communicated with the high-pressure oil return port T2, a third parallel flow channel on the front face and coaxially communicated with the high-pressure oil inlet port P2, a fourth parallel flow channel on the front face, and a fifth parallel flow channel on the back face and coaxially communicated with the first parallel flow channel.

[0015] Further, the first horizontal flow channel is cross communicated with the first vertical flow channel and the fourth parallel flow channel, the second horizontal flow channel is cross communicated with the second parallel flow channel, the third horizontal flow channel is cross communicated with the first and fourth parallel flow channels, the fourth horizontal flow channel is cross communicated with the fifth parallel flow channel, the fifth parallel flow channel is cross communicated with the fifth parallel flow channel, the first inclined flow channel is cross communicated with the second vertical flow channel, the first vertical flow channel is communicated with the low-pressure oil inlet port P1, and the second vertical flow channel is communicated with the low-pressure oil return port T1.

[0016] The six screw plugs are provided with outer threads matched with inner threads of the first vertical flow channel, the fourth parallel flow channel, the second horizontal flow channel, the fifth parallel flow channel, the third horizontal flow channel, and the fifth parallel flow channel.

[0017] Furthermore, the proportional pressure regulating valve for the ultra-high pressure hydraulic system can realize the one-way proportional regulation function of the pressure rise of the ultra-high pressure system: the first auxiliary oil port C1 and the second auxiliary oil port C2 are blocked by screw plugs, the low-pressure side oil port P1 is connected to the low-pressure pump outlet, the return oil port T1 is connected to the oil tank, the high-pressure side oil port P2 is connected to the ultra-high pressure pump outlet, and the return oil port T2 is connected to the oil tank. The low-pressure pump outlet pressure is regulated by the proportional relief valve, and the low-pressure pump outlet oil enters the end face plunger cavity of the plunger of the hydraulically controlled relief valve through the pressure stabilizing damping and the one-way valve. The disc spring transfers the force on the plunger to the overflow steel ball through the spring support. The pressure at the outlet of the ultra-high pressure pump acts on the opening direction of the overflow steel ball. The pressure at the high-pressure oil inlet P2 port multiplied by the cross-sectional area of ​​the tangent surface between the overflow steel ball and the overflow valve seat is the opening force of the hydraulically controlled overflow valve. The pressure in the plunger cavity multiplied by the plunger end area is the propulsion force of the hydraulically controlled overflow valve. When the opening force is greater than the propulsion force, the overflow steel ball opens and the hydraulically controlled overflow valve starts to overflow, so that the pressure at the high-pressure oil inlet P port remains basically unchanged. The damping effect of the pressure-stabilizing damper can reduce the pressure fluctuations at port C1 when pressure fluctuations occur at port P1. While controlling the pressure rise at port P1, the oil at port P1 can freely pass through the one-way valve into the plunger chamber of the hydraulically controlled relief valve. The relief pressure at port P2 increases as the pressure at port P1 increases. During a pressure drop at port P1, the one-way valve closes to maintain pressure, preventing the pressure in the plunger chamber of the hydraulically controlled relief valve from decreasing. Port P2 remains unchanged by the pressure drop at port P1. When pressure fluctuates at port C1, the one-way pressure transmission characteristic of the one-way valve reduces the amplitude of pressure fluctuations in the plunger chamber. Because the cross-sectional area of ​​the plunger is over 20 times the tangential area of ​​the steel ball, a pressure change within the 0-10 MPa range in the low-pressure pump can control the pressure of the ultrahigh-pressure pump to vary between 0 and 200 MPa. Proportional regulation of the ultrahigh-pressure system pressure rise can be achieved by increasing the current in the proportional relief valve.

[0018] Furthermore, the proportional pressure-regulating valve used in the ultra-high-pressure hydraulic system can realize the pressure unloading function of the ultra-high-pressure system: the first auxiliary oil port C1 is blocked by a screw plug, and the second auxiliary oil port C2 is connected to a normally-off two-position two-way electromagnetic reversing valve. After the electromagnetic reversing valve is energized, the oil in the plunger chamber of the hydraulically controlled relief valve passes through the electromagnetic reversing valve to the oil tank for rapid pressure relief, the steel ball of the hydraulically controlled relief valve opens, and the pressure at the high-pressure inlet P2 port is unloaded.

[0019] Furthermore, the proportional pressure-regulating valve for the ultra-high-pressure hydraulic system can achieve bidirectional proportional regulation of pressure rise and fall in the ultra-high-pressure system: the first auxiliary oil port C1 and the second auxiliary oil port C2 are respectively connected to the two end ports of a normally-off, two-position, two-way solenoid directional control valve. When the solenoid directional control valve is de-energized, proportional regulation can be achieved when the ultra-high-pressure system pressure rises. When the proportional relief valve controls the pressure drop at low-pressure port P1, after the solenoid directional control valve is energized, the oil in the plunger chamber of the hydraulically controlled relief valve is directly connected to port C1 through the solenoid directional control valve, and the one-way valve is deactivated. The plunger chamber pressure decreases as the pressure at port P1 decreases, and the relief pressure at port P2 decreases proportionally with the decrease in pressure at port P1, thereby achieving proportional regulation of the ultra-high-pressure system pressure drop.

[0020] The beneficial effects of the present invention are as follows: 1. The present invention can be used in 200MPa grade ultra-high pressure hydraulic systems to achieve proportional regulation of system pressure; 2. The present invention adopts an integrated design with a compact structure and is easy to install and maintain; 3. The present invention can adjust the high pressure by controlling the low pressure; 4. The external control structure of the present invention has only a single hydraulically controlled relief valve on the high-pressure side, and the leakage on the high-pressure side is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the principle of an externally controlled ultra-high pressure proportional pressure regulating valve according to an embodiment of the present invention.

[0022] Figure 2 It is a front view of an externally controlled ultra-high pressure proportional pressure regulating valve according to an embodiment of the present invention.

[0023] Figure 3 It is a right side view of the externally controlled ultra-high pressure proportional pressure regulating valve according to an embodiment of the present invention.

[0024] Figure 4 yes Figure 2 AA cross-sectional view.

[0025] Figure 5 yes Figure 3 BB cross-sectional view.

[0026] Figure 6 It is a schematic diagram of the ultra-high pressure rise one-way proportional regulation system according to an embodiment of the present invention.

[0027] Figure 7 It is a principle diagram of a pressure-rising one-way proportional regulation system with unloading function according to an embodiment of the present invention.

[0028] Figure 8 It is a schematic diagram of the principle of the ultra-high pressure rise / fall bidirectional proportional regulation system according to an embodiment of the present invention.

[0029] In the figure, 1 is a proportional relief valve, 1.1 is a proportional solenoid, 1.2 is a cone valve core, 1.3 is a circular valve seat, 1.4 is a proportional valve seal ring, 2 is a pressure stabilizing damper, 3 is a one-way valve, 3.1 is a one-way steel ball, 3.2 is a steel ball base, 3.3 is a return spring, 3.4 is a spring support, 4 is a hydraulically controlled relief valve, 4.1 is a relief valve body, 4.2 is a spring support, 4.3 is an overflow steel ball, 4.4 is a relief valve seat, 4.5 is a plunger, 4.6 is a disc spring, 4.7 is a relief valve seal ring, 5 is an integrated valve block, 5.1 is the first horizontal flow channel, 5.2 is the second horizontal flow channel, 5.3 is the hydraulic control relief valve, 4.1 is the relief valve body, 4.2 is the spring support, 4.3 is the overflow steel ball, 4.4 is the relief valve seat, 4.5 is the plunger, 4.6 is the disc spring, 4.7 is the relief valve seal ring, 5 is an integrated valve block, 5.1 is the first horizontal flow channel, 5.2 is the second horizontal flow channel, 5.3 is the hydraulic control relief valve, 5.1 is the hydraulic control relief valve, 5.2 is the hydraulic control relief valve, 5.3 is the hydraulic control relief valve, 5.1 is the hydraulic control relief valve body ... is the third horizontal flow channel, 5.4 is the fourth horizontal flow channel, 5.5 is the fifth horizontal flow channel, 5.6 is the first oblique flow channel, 5.7 is the first vertical flow channel, 5.8 is the second vertical flow channel, 5.9 is the first parallel flow channel, 5.10 is the second parallel flow channel, 5.11 is the third parallel flow channel, 5.12 is the fourth parallel flow channel, 5.13 is the fifth parallel flow channel, 6 is a screw plug, 6.1 is the first screw plug, 6.2 is the second screw plug, 6.3 is the third screw plug, 6.4 is the fourth screw plug, 6.5 is the fifth screw plug, 6.6 is the sixth screw plug, 7 is a low-pressure pump, 8 is an ultra-high-pressure pump, and 9 is an electromagnetic reversing valve. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the purpose and effects of the present invention will become more apparent. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] like Figure 1 、 2 As shown in Figures 3 and 4, the proportional pressure-regulating valve for an ultra-high-pressure hydraulic system of this embodiment comprises a proportional relief valve 1, a pressure-stabilizing damper 2, a check valve 3, a hydraulically-controlled relief valve 4, an integrated valve block 5, and a screw plug 6. The proportional pressure-regulating valve for an ultra-high-pressure hydraulic system of this embodiment is a tubular connection valve comprising a low-pressure side oil inlet port P1 and an oil return port T1, a high-pressure side oil inlet port P2 and an oil return port T2, a first auxiliary oil port C1, and a second auxiliary oil port C2.

[0032] like Figure 4As shown, the proportional relief valve 1 is a cartridge valve structure, comprising a proportional solenoid 1.1, a cone valve core 1.2, a circular valve seat 1.3, and a proportional valve seal 1.4. The proportional solenoid 1.1 has a bolt port, which is secured to the integrated valve block via bolts and sealed by a proportional valve seal (.4). The cone valve core 1.2 is installed in the second vertical flow channel 5.8 of the integrated valve block 5, and the circular valve seat 1.3 is installed in the first vertical flow channel 5.7. An interference fit is employed, so that the cone valve core 1.2 engages tangentially with the inner bore of the circular valve seat 1.3 under the thrust of the proportional solenoid. The oil inlet of the proportional relief valve 1 communicates with the low-pressure oil inlet P1, and the oil return port of the cone valve core chamber communicates with the low-pressure oil return port T1. The pressure at the low-pressure side port P1 can be adjusted by adjusting the current flowing through the proportional solenoid 1.1.

[0033] like Figure 5 As shown, the pressure-stabilizing damper 2 is a threaded fixed damper installed in the third horizontal flow channel 5.3 of the integrated valve block 5. The oil ports on both sides of the pressure-stabilizing damper 2 are respectively connected to the low-pressure side oil inlet P1 and the first auxiliary oil port C. The throttling effect on the pressure-stabilizing damper 2 can stabilize the pressure at the C1 port.

[0034] like Figure 5 As shown, the one-way valve 3 includes a one-way steel ball 3.1, a steel ball base 3.2, a return spring 3.3, and a spring support 3.4. The one-way steel ball 3.1 is installed in the fifth parallel flow channel 5.13 of the integrated valve block 5, tangent to the first parallel flow channel 5.3. The steel ball base 3.2 is used to support the one-way steel ball 3.1. The return spring 3.3 is installed between the steel ball base 3.2 and the spring support 3.4. The spring support 3.4 is used to compress the return spring to press the steel ball 3.1. The one-way valve 3 can allow oil from the first auxiliary oil port C1 to flow unidirectionally to the second auxiliary oil port C2, and can also play a role in maintaining the pressure of port C2.

[0035] like Figure 5As shown, the hydraulically controlled relief valve 4 is a cartridge-type structure, comprising a relief valve body 4.1, a spring support 4.2, a relief steel ball 4.3, a relief valve seat 4.4, a plunger 4.5, a disc spring 4.6, and a relief valve seal 4.7. The hydraulically controlled relief valve 3's oil inlet is connected to the high-pressure side oil inlet port P2, its oil return port is connected to the high-pressure side oil return port T2, and the plunger's operating chamber is connected to port C2. The relief valve body 4.1 has external threads that connect to the internal threads on the integrated valve block 5 for cartridge connection. Relief valve seat 4.4 is an interference fit with relief valve body 4.1. Relief steel ball 4.3 is installed in the inner bore of relief valve seat 4.4, tangentially engaging the tapered bore within. Spring support 4.2 is installed within the inner bore of relief valve seat 4.4, with its upper spherical concave surface pressing against relief steel ball 4.3. Plunger 4.5 is installed in the bottom inner bore of relief valve body 4.1. Disc spring 4.6 is installed between spring support 4.2 and plunger 4.5, transmitting the force acting on plunger 4.5 to spring support 4.2 and relief steel ball 4.3. Tightening relief valve body 4.1 compresses the top conical surface of relief valve seat 4.4 against the tapered inner bore of integrated valve block 5, creating a conical hard seal. This ensures a reliable seal between the high-pressure side oil inlet P2 and the oil return port T2 at pressures above 200 MPa.

[0036] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 As shown, 13 flow channels are opened on the integrated valve block 5. The first horizontal flow channel 5.1 is punched at the bottom of the low-pressure oil inlet P1; the second horizontal flow channel 5.2 is punched on the right side of the integrated valve block 5 and is a process hole; the third horizontal flow channel 5.3 is punched on the left side of the integrated valve block 5 and is a process hole; the fourth horizontal flow channel 5.4 is punched at the bottom of the second auxiliary oil port C2; the fifth horizontal flow channel 5.5 is punched on the right side of the integrated valve block 5 and is a process hole; the first oblique flow channel 5.6 is punched at the bottom of the low-pressure oil return port T1; the first vertical flow channel 5.7 is punched at the bottom of the integrated valve block A hole is punched on the lower side of the integrated valve block 5 as a process hole; a second vertical flow channel 5.8 is punched on the upper side of the integrated valve block 5 as the oil return hole for the proportional relief valve 1; a first parallel flow channel 5.9 is punched at the bottom of the first auxiliary oil port C1; a second parallel flow channel 5.10 is punched at the bottom of the high-pressure return oil port T2; a third parallel flow channel 5.11 is punched at the bottom of the insertion hole for the hydraulically controlled relief valve 4; a fourth parallel flow channel 5.12 is punched on the front of the integrated valve block 5 as a process hole; and a fifth parallel flow channel 5.13 is punched on the back of the integrated valve block 5 as the mounting hole for the check valve 3.

[0037] The low pressure oil inlet P1 is communicated with the first horizontal flow channel 5.1, the first vertical flow channel 5.7, the fourth parallel flow channel 5.12 and the pressure stabilizing damper 2 in the third horizontal flow channel 5.3, the low pressure oil return port T1 is communicated with the first inclined flow channel 5.6 and the second vertical flow channel 5.8, the first auxiliary oil port C1 is communicated with the first parallel flow channel 5.9 and the pressure stabilizing damper 2 outlet in the third horizontal flow channel 5.3, the second auxiliary oil port C2 is communicated with the fourth horizontal flow channel 5.4, the fifth parallel flow channel 5.13 and the fifth horizontal flow channel 5.5, the high pressure oil inlet P2 is communicated with the third parallel flow channel 5.11, and the high pressure oil return port T2 is communicated with the second parallel flow channel 5.10 and the second horizontal flow channel 5.2.

[0038] The first screw plug 6.1 is installed on the threads of the first vertical flow channel 5.7 to seal the oil, the second screw plug 6.2 is installed on the threads of the fourth parallel flow channel 5.12 to seal the oil, the third screw plug 6.3 is installed in the threads of the third horizontal flow channel 5.3 to seal the oil, the fourth screw plug 6.4 is installed in the threads of the fifth horizontal flow channel 5.5 to seal the oil, the fifth screw plug 6.5 is installed on the threads of the third horizontal flow channel 5.3 to seal the oil, and the sixth screw plug 6.6 is installed on the threads of the fifth parallel flow channel 5.13 to seal the oil.

[0039] As Figure 6As shown, the proportional pressure regulating valve used in the ultra-high pressure hydraulic system can realize the one-way proportional regulation function of the pressure rise of the ultra-high pressure system: the first auxiliary oil port C1 and the second auxiliary oil port C2 are blocked by screw plugs, the low-pressure side oil port P1 is connected to the outlet of the low-pressure pump 7, and the return oil port T1 is connected to the oil tank, the high-pressure side oil port P2 is connected to the outlet of the ultra-high pressure pump 8, and the return oil port T2 is connected to the oil tank, and the outlet pressure of the low-pressure pump 7 is regulated by the proportional relief valve 1. The oil at the outlet of the low-pressure pump 7 enters the end face plunger cavity of the plunger 4.5 of the hydraulic control relief valve 4 through the pressure stabilizing damper 2 and the one-way valve 3, generating a thrust on the plunger 4.5 to compress the disc spring 4.6. When the force of the pressure at the P2 port acting on the overflow steel ball 4.3 is greater than the force on the plunger 4.5, the overflow steel ball 4.3 opens, and the hydraulic control relief valve 4 starts to overflow, so that the pressure at the high-pressure oil inlet P2 port remains basically unchanged. The damping effect of the pressure-stabilizing damper 2 reduces pressure fluctuations at port C1 when pressure at port P1 fluctuates. While controlling the pressure at port P1 to rise, the oil at port P1 can freely flow through the check valve 3 into the plunger chamber of the hydraulically controlled relief valve 4. The relief pressure at port P2 increases as the pressure at port P1 rises. However, as the pressure at port P1 decreases, the check valve 3 closes to maintain pressure, preventing the pressure in the plunger chamber of the hydraulically controlled relief valve 4 from decreasing. Consequently, the pressure at port P2 remains unchanged due to the pressure drop at port P1. When pressure at port C1 fluctuates, the one-way pressure transmission characteristic of the check valve 3 reduces the amplitude of pressure fluctuations in the plunger chamber. Because the cross-sectional area of ​​the plunger 4.5 is over 20 times the tangential area of ​​the relief ball 4.3, a pressure fluctuation between 0 and 10 MPa at the outlet of the low-pressure pump 7 can control the pressure of the ultra-high-pressure pump 8 between 0 and 200 MPa. Proportional regulation of the ultra-high-pressure system pressure rise can be achieved by increasing the current flowing through the proportional relief valve 1.

[0040] like Figure 7 As shown, the proportional pressure regulating valve used in the ultra-high pressure hydraulic system can realize the pressure unloading function of the ultra-high pressure system: the low-pressure side oil port P1 is connected to the outlet of the low-pressure pump 7, and the return oil port T1 is connected to the oil tank. The high-pressure side oil port P2 is connected to the outlet of the ultra-high pressure pump 8, and the return oil port T2 is connected to the oil tank. The first auxiliary oil port C1 is blocked by a screw plug, and the second auxiliary oil port C2 is connected to the normally-off two-position two-way solenoid reversing valve 9. After the solenoid reversing valve 9 is energized, the oil in the plunger chamber of the hydraulically controlled relief valve 4 is quickly depressurized through the solenoid reversing valve 9 to the oil tank, the hydraulically controlled relief valve steel ball 4.3 opens, and the outlet pressure of the ultra-high pressure pump 8 is unloaded.

[0041] like Figure 8As shown, the proportional pressure regulating valve for super-high pressure hydraulic system can realize the proportional regulating function of pressure rising and falling of super-high pressure system: the low pressure side oil port P1 is connected with the outlet of low pressure pump 7, the return oil port T1 is connected with the oil tank, the high pressure side oil port P2 is connected with the outlet of super-high pressure pump 8, the return oil port T2 is connected with the oil tank, the first auxiliary oil port C1 and the second auxiliary oil port C2 are respectively connected with the two end oil ports of the normally-off two-position two-way electromagnetic reversing valve 9, and the proportional regulating during the pressure rising of super-high pressure system can be realized when the electromagnetic reversing valve 9 is not electrified. When the proportional relief valve 1 controls the pressure falling of low pressure port P1, the oil in the plunger cavity of hydraulic control relief valve 4 can be directly connected with C1 port through the electromagnetic reversing valve 9 after the electromagnetic reversing valve 9 is electrified, the one-way valve 3 does not work, and the plunger cavity pressure will be reduced with the pressure reduction of P1 port, and the relief pressure of P2 port will be reduced in proportion with the pressure reduction of P1 port, so as to realize the proportional regulation during the pressure falling of super-high pressure pump 8 outlet.

[0042] Those skilled in the art can understand that the above description is only preferred examples of the application and is not used to limit the application, although the application is described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions recorded in the foregoing examples or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, etc. within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An externally controlled ultra-high pressure proportional pressure regulating valve, characterized in that: The externally controlled ultra-high pressure proportional pressure regulating valve comprises a proportional relief valve (1), a pressure stabilizing damper (2), a one-way valve (3), a hydraulically controlled relief valve (4), an integrated valve block (5), and a screw plug (6); the externally controlled ultra-high pressure proportional pressure regulating valve is a pipe-type connection valve, and the oil ports comprise a low-pressure side oil inlet port P1, an oil return port T1, a high-pressure side oil inlet port P2, an oil return port T2, a first auxiliary oil port C1, and a second auxiliary oil port C2.

2. The externally controlled ultra-high pressure proportional pressure regulating valve according to claim 1, characterized in that: The proportional relief valve (1) is a plug-in valve structure, comprising a proportional electromagnet (1.1), a cone valve core (1.2), a circular valve seat (1.3), and a proportional valve sealing ring (1.4). The proportional electromagnet (1.1) is provided with a bolt hole, which is fixed to the integrated valve block (5) by bolts and is sealed by the proportional valve sealing ring (1.4). The cone valve core (1.2) is installed in the second vertical flow channel (5.8) of the integrated valve block (5). The circular valve The seat (1.3) is installed in the first vertical flow channel (5.7) of the integrated valve block (5) in an interference fit manner. The cone valve core (1.2) is tangentially matched with the inner hole of the circular valve seat (1.3) under the thrust of the proportional electromagnet. The oil inlet of the proportional relief valve (1) is connected to the low-pressure oil inlet P1, and the oil return port of the cone valve core cavity is connected to the low-pressure oil return port T1. The pressure at the low-pressure side P1 port can be adjusted by adjusting the current of the proportional electromagnet (1.1).

3. The externally controlled ultra-high pressure proportional pressure regulating valve according to claim 2, characterized in that: The pressure stabilizing damper (2) is a threaded fixed damper installed in the third horizontal flow channel (5.3) of the integrated valve block (5). The oil ports on both sides of the pressure stabilizing damper (2) are respectively connected to the low-pressure side oil inlet port P1 and the first auxiliary oil port C1. The throttling effect on the pressure stabilizing damper (2) can stabilize the pressure at the C1 port.

4. The externally controlled ultra-high pressure proportional pressure regulating valve according to claim 3, characterized in that: The one-way valve (3) comprises a one-way steel ball (3.1), a steel ball base (3.2), a return spring (3.3), and a spring support (3.4); the one-way steel ball (3.1) is installed in the fifth parallel flow channel (5.13) of the integrated valve block (5) and is tangent to the first parallel flow channel (5.3); the steel ball base (3.2) is used to support the one-way steel ball (3.1); the return spring (3.3) is installed between the steel ball base (3.2) and the spring support (3.4); the spring support (3.4) is used to compress the return spring to press the steel ball (3.1); and the one-way valve (3) can allow oil from the first auxiliary oil port C1 to flow in one direction to the second auxiliary oil port C2.

5. The externally controlled ultra-high pressure proportional pressure regulating valve according to claim 4, characterized in that: The hydraulically controlled relief valve (4) is a plug-in structure, comprising a relief valve body (4.1), a spring support (4.2), an overflow steel ball (4.3), a relief valve seat (4.4), a plunger (4.5), a disc spring (4.6), and a relief valve sealing ring (4.7). The oil inlet of the hydraulically controlled relief valve (3) is connected to the high-pressure side oil inlet port P2, and the oil return port is connected to the high-pressure side oil return port T2. The oil in the plunger action chamber is connected to the C2 port. The relief valve body (4.1) is provided with an external thread, which is plug-in connected to the internal thread on the integrated valve block (5). The relief valve seat (4.4) and the relief valve body (4.1) are interference-fitted. The overflow steel ball (4.3) is installed in the inner hole of the relief valve seat (4.4) and is aligned with the tapered hole in the relief valve seat (4.4). The spring support (4.2) is installed in the inner hole of the overflow valve seat (4.4), and the upper spherical concave surface is pressed against the overflow steel ball (4.3). The plunger (4.5) is installed in the bottom inner hole of the overflow valve body (4.1). The disc spring (4.6) is installed between the spring support (4.2) and the plunger (4.5) and is used to transmit the force on the plunger (4.5) to the spring support (4.2) and the overflow steel ball (4.3). By tightening the overflow valve body (4.1), the top conical surface of the overflow valve seat (4.4) and the conical inner hole in the integrated valve block (5) are pressed to perform a conical hard seal, thereby ensuring that the high-pressure side oil inlet P2 is reliably sealed with the oil return port T2 when the pressure is above 200 MPa.

6. The externally controlled ultra-high pressure proportional pressure regulating valve according to claim 5, characterized in that: The integrated valve block (5) is provided with a first horizontal flow channel (5.1) on the left side and is coaxially connected to the low-pressure oil inlet port P1, a second horizontal flow channel (5.2) on the right side, a third horizontal flow channel (5.3) and a fourth horizontal flow channel (5.4) on the left side and are coaxially connected to the second auxiliary oil port C2, a fifth horizontal flow channel (5.5) on the right side, and a first oblique flow channel (5.6) on the left side and is connected to the low-pressure oil return port T1; The integrated valve block (5) is provided with a first vertical flow channel (5.7) on the lower side, and a second vertical flow channel (5.8) is provided on the upper side and is coaxial with the first vertical flow channel (5.7); The integrated valve block (5) is provided with a first parallel flow channel (5.9) on the front side and is coaxially connected to the first auxiliary oil port C2, a second parallel flow channel (5.10) on the front side and is coaxially connected to the high-pressure oil return port T2, a third parallel flow channel (5.11) on the front side and is coaxially connected to the high-pressure oil inlet port P2, a fourth parallel flow channel (5.12) on the front side, and a fifth parallel flow channel (5.13) on the back side and is coaxial with the first parallel flow channel (5.9); The first horizontal flow channel (5.1) is cross-connected with the first vertical flow channel (5.7) and the fourth parallel flow channel (5.12); the second horizontal flow channel (5.2) is cross-connected with the second parallel flow channel (5.10); the third horizontal flow channel (5.3) is cross-connected with the first parallel flow channel (5.9) and the fourth parallel flow channel (5.12); the fourth horizontal flow channel (5.4) is cross-connected with the fifth parallel flow channel (5.13); the fifth parallel flow channel (5.5) is cross-connected with the fifth parallel flow channel (5.13); the first oblique flow channel (5.6) is cross-connected with the second vertical flow channel (5.8); the first vertical flow channel (5.7) is connected to the low-pressure oil inlet port P1; and the second vertical flow channel (5.8) is connected to the low-pressure oil return port T1.

7. The externally controlled ultra-high pressure proportional pressure regulating valve according to claim 6, characterized in that: There are 6 screw plugs in total. The external thread of the first screw plug (6.1) is matched with the internal thread of the first vertical flow channel (5.7) for installation. The external thread of the second screw plug (6.2) is matched with the internal thread of the fourth parallel flow channel (5.12) for installation. The external thread of the third screw plug (6.3) is matched with the internal thread of the second horizontal flow channel (5.2) for installation. The external thread of the fourth screw plug (6.4) is matched with the internal thread of the fifth parallel flow channel (5.5) for installation. The external thread of the fifth screw plug (6.5) is matched with the internal thread of the third horizontal flow channel (5.3) for installation. The external thread of the sixth screw plug (6.6) is matched with the internal thread of the fifth parallel flow channel (5.13) for installation.

8. The externally controlled ultra-high pressure proportional pressure regulating valve according to claim 7, characterized in that: The proportional pressure regulating valve for the ultra-high pressure hydraulic system can realize the pressure rising one-way proportional regulation function of the ultra-high pressure system: the first auxiliary oil port C1 and the second auxiliary oil port C2 are blocked by screw plugs, the low-pressure side oil port P1 is connected to the low-pressure pump outlet, the return oil port T1 is connected to the oil tank, the high-pressure side oil port P2 is connected to the ultra-high pressure pump outlet, and the return oil port T2 is connected to the oil tank, the low-pressure pump outlet pressure is regulated by the proportional relief valve (1), and the low-pressure pump outlet oil enters the end face plunger cavity of the plunger (4.5) of the hydraulic control relief valve (4) through the pressure stabilizing damper (2) and the one-way valve (3). The disc spring (4.6) transmits the force on the plunger to the overflow steel ball (4.3) through the spring support (4.2). The pressure at the outlet of the ultra-high pressure pump acts on the opening direction of the overflow steel ball (4.3). The pressure at the high-pressure oil inlet P2 multiplied by the cross-sectional area of ​​the tangent surface between the overflow steel ball (4.3) and the overflow valve seat (4.4) is the opening force of the hydraulically controlled overflow valve (4). The pressure in the plunger cavity multiplied by the end area of ​​the plunger (4.5) is the propulsion force of the hydraulically controlled overflow valve (4). When the opening force is greater than the propulsion force, the overflow steel ball ( 4.3) is opened, the hydraulically controlled overflow valve (4) begins to overflow, so that the pressure of the high-pressure oil inlet port P remains basically unchanged. The damping effect of the pressure stabilizing damper (2) can reduce the pressure fluctuation value of the C1 port when the pressure fluctuation occurs at the P1 port. In the process of controlling the pressure rise of the P1 port, the oil at the P1 port can freely pass through the one-way valve (3) into the plunger cavity of the hydraulically controlled overflow valve (4). The overflow pressure of the P2 port will increase as the pressure of the P1 port increases. In the process of the pressure drop of the P1 port, since the one-way valve (3) will close in the reverse direction to maintain the pressure, the hydraulically controlled overflow The pressure in the plunger cavity of the valve (4) will not drop, and the P2 port will not change due to the pressure drop at the P1 port. When the pressure at the C1 port fluctuates, the one-way pressure transmission characteristic of the one-way valve (3) will reduce the pressure fluctuation amplitude of the plunger cavity. Since the cross-sectional area of ​​the plunger (4.5) is more than 20 times the tangential area of ​​the steel ball (4.3), the low-pressure pump can control the ultra-high pressure pump pressure to change within 0-200 MPa by changing within 0-10 MPa. By adjusting the current on the proportional relief valve (1) to increase, proportional regulation can be achieved when the ultra-high pressure system pressure rises.

9. The externally controlled ultra-high pressure proportional pressure regulating valve according to claim 8, characterized in that: The proportional pressure regulating valve used in the ultra-high pressure hydraulic system can realize the pressure unloading function of the ultra-high pressure system: the first auxiliary oil port C1 is blocked by a screw plug, and the second auxiliary oil port C2 is connected to a normally-off two-position two-way electromagnetic reversing valve. After the electromagnetic reversing valve is energized, the oil in the plunger cavity of the hydraulically controlled relief valve (4) is quickly depressurized to the oil tank through the electromagnetic reversing valve, and the steel ball (4.3) of the hydraulically controlled relief valve opens, and the pressure at the high-pressure inlet P2 is unloaded.

10. The externally controlled ultra-high pressure proportional pressure regulating valve according to claim 9, characterized in that: The proportional pressure regulating valve for the ultra-high pressure hydraulic system can realize the bidirectional proportional regulation function of the pressure rise / fall of the ultra-high pressure system: the first auxiliary oil port C1 and the second auxiliary oil port C2 are respectively connected to the two end oil ports of the normally-off two-position two-way electromagnetic reversing valve, so that when the electromagnetic reversing valve is not energized, the proportional regulation of the ultra-high pressure system pressure rise can be realized. When the proportional relief valve (1) controls the pressure drop of the low pressure port P1, after the electromagnetic reversing valve is energized, the oil in the plunger cavity of the hydraulically controlled relief valve (4) can be directly connected to the C1 port through the electromagnetic reversing valve, and the one-way valve (3) does not work. The plunger cavity pressure will decrease as the pressure of the P1 port decreases, and the overflow pressure of the P2 port decreases proportionally with the pressure decrease of the P1 port, thereby realizing the proportional regulation of the ultra-high pressure system pressure drop.

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