Hydraulic superhigh-pressure slow pressure relief device and slow pressure relief method

Abstract

The application discloses a kind of hydraulic superhigh pressure slow pressure relief device and slow pressure relief method, it is related to superhigh pressure pressure relief technical field, slow pressure relief device connects superhigh pressure container, the medium discharge port of superhigh pressure container is communicated with high pressure stop valve, including booster, booster includes high pressure cylinder and low pressure cylinder;High pressure stop valve outlet end is provided with check valve;High pressure cylinder is communicated with the port of one-way valve far away from high pressure stop valve side by pipeline;Control mechanism, control mechanism includes flow control valve, flow control valve is communicated with low pressure cylinder, to be collected to the speed or flow of medium in high pressure cylinder by controlling the oil discharge speed or flow of low pressure cylinder when superhigh pressure container is relieved, to realize slow pressure relief control;Back pressure valve, back pressure valve is communicated with high pressure cylinder by pipeline, to discharge the medium collected in high pressure cylinder when high pressure cylinder pressurizes;The application can realize that superhigh pressure container is effectively slow pressure relief under superhigh pressure condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultra-high pressure pressure relief, in particular to a hydraulic ultra-high pressure slow pressure relief device and a slow pressure relief method. BACKGROUND

[0002] Generally, the working cylinder of the cold isostatic press or other ultra-high pressure container is used for isostatic forming process, and the pressurization or pressure relief speed is relatively fast according to the process requirements and work efficiency. It is easy to realize slow pressurization, and the pressurization speed can be conveniently controlled by controlling the pressurizer pressurization speed or low pressure flow; but it is difficult to realize long-time slow and uniform pressure relief. In order to simulate the pressure process of the object slowly floating from deep water, it is necessary to realize the slow pressure relief of the hydraulic ultra-high pressure container. The existing high pressure or ultra-high pressure relief valve mostly uses needle valve, cone valve or ball valve structure, and the needle valve and cone valve are difficult to control the valve opening degree, and can only be closed or opened very large, so that slow pressure relief cannot be realized. Although the cone valve can control the opening degree, it belongs to gap sealing, and the cross-sectional area of the opening ring gap is large once opened, so that the pressure relief is also fast under the condition of ultra-high pressure, and it is difficult to realize slow pressure relief. At present, there is no general ultra-high pressure servo valve or proportional valve that can realize slow pressure relief, and even the self-made one is quickly damaged by the flushing of the ultra-high pressure relief liquid, and cannot meet the use requirements.

[0003] How to provide a hydraulic ultra-high pressure slow pressure relief device and a slow pressure relief method, which can solve the problem that the traditional pressure relief device cannot effectively perform slow pressure relief under the condition of ultra-high pressure, is a problem that those skilled in the art need to solve. SUMMARY

[0004] Therefore, the present application provides a hydraulic ultra-high pressure slow pressure relief device and a slow pressure relief method, which can realize effective slow pressure relief of the ultra-high pressure container under the condition of ultra-high pressure.

[0005] In order to achieve the above purpose, one aspect of the present application provides a hydraulic ultra-high pressure slow pressure relief device, a hydraulic ultra-high pressure slow pressure relief device connected to an ultra-high pressure container, a medium discharge port of the ultra-high pressure container being communicated with a high pressure stop valve, comprising:

[0006] A pressurizer, the pressurizer being a single-acting reciprocating hydraulic pressurizer, the pressurizer comprising a high pressure cylinder and a low pressure cylinder; a one-way valve is arranged at the outlet end of the high pressure stop valve, which can prevent the medium of the high pressure cylinder from flowing back to the ultra-high pressure container; the high pressure cylinder is communicated with the port away from the one-way valve on the side of the high pressure stop valve through a pipeline;

[0007] A control mechanism comprising a flow control valve, which is in communication with the low-pressure cylinder to control the speed or flow of the medium collected into the high-pressure cylinder from the super-high-pressure container by controlling the oil discharge speed or flow of the low-pressure cylinder when the super-high-pressure container is depressurized;

[0008] A back pressure valve, which is in communication with the high-pressure cylinder through a pipeline to discharge the medium collected inside the high-pressure cylinder when the high-pressure cylinder is pressurized.

[0009] According to the above technical solution, compared with the prior art, the hydraulic super-high-pressure slow depressurization device provided by the present application realizes slow depressurization by reversely using the pressurizer, controls the liquid inlet speed or flow of the high-pressure cylinder of the pressurizer by controlling the oil discharge speed or flow of the low-pressure cylinder of the pressurizer, and converts the flow or flow rate control of the super-high-pressure container into the oil discharge speed control of the low-pressure cylinder of the pressurizer, thereby solving the technical problem of difficult direct depressurization of high-pressure or super-high-pressure medium liquid. The technical solution of the present application realizes controllable slow depressurization by indirectly depressurizing the super-high-pressure in a way that the flow control valve controls the large-flow oil discharge of the low-pressure cylinder of the pressurizer to indirectly control the small-flow liquid inlet of the high-pressure cylinder of the pressurizer. The pressure threshold of the back pressure valve is set to be greater than the initial pressure value of the super-high-pressure container, so that the medium liquid discharged from the super-high-pressure container can be collected in the high-pressure cylinder. When the pressurizer is pressurized in the forward direction, the one-way valve can prevent the medium liquid from flowing back to the super-high-pressure container. When the pressure in the high-pressure cylinder is greater than the pressure threshold of the back pressure valve, the medium liquid can be quickly discharged through the back pressure valve. The above process is repeated to realize continuous slow depressurization.

[0010] As a further improvement of the above technical solution, the low-pressure cylinder and the high-pressure cylinder are coaxially arranged; a piston is sealingly and slidably connected in the low-pressure cylinder; a plunger is sealingly and slidably connected in the high-pressure cylinder; one end of the plunger extends into the low-pressure cylinder and is fixed with the piston; the piston divides the low-pressure cylinder into a first low-pressure cylinder and a second low-pressure cylinder;

[0011] The control mechanism further comprises an electromagnetic reversing valve, a one-way throttle valve, an oil return tank, a first pipeline, a second pipeline, a third pipeline, and an oil pump; the first low-pressure cylinder is in communication with the oil return tank through the first pipeline; the flow control valve is installed on the first pipeline;

[0012] The electromagnetic reversing valve has a first oil outlet, a second oil outlet, an oil inlet, and an oil return port; the first oil outlet is connected to the first low-pressure cylinder through the second pipeline; the second oil outlet is connected to the second low-pressure cylinder through the third pipeline; the outlet of the oil pump is connected to the oil inlet; and the oil return tank is connected to the oil return port;

[0013] The one-way throttle valve is installed on the second pipeline to control the oil return speed of the first low-pressure cylinder.

[0014] When the super-high pressure container is in a super-high pressure or high pressure state, the medium hydraulic pressure discharged into the high pressure cylinder can push the plunger and piston back, and the oil discharge speed or flow of the low pressure cylinder one can be controlled through the control flow control valve to achieve slow pressure relief; when the super-high pressure container is in a medium pressure and low pressure state, the medium hydraulic pressure discharged into the high pressure cylinder cannot push the plunger and piston back, and the low pressure cylinder two can be pressurized through the oil pump to assist in pushing the plunger and piston back, and the oil discharge speed or flow of the low pressure cylinder one can be controlled through the one-way throttling valve to achieve slow pressure relief.

[0015] As a further improvement of the above technical solution, the back pressure valve is an adjustable back pressure valve with adjustable high and low back pressure; the adjustable back pressure valve can adapt to super-high pressure containers in different pressure states for slow pressure relief.

[0016] As a further improvement of the above technical solution, the back pressure valve comprises a valve body one, a valve core one, a connecting seat one, a valve pad one, a top pin, a fastening sleeve body and a pressure adjusting assembly.

[0017] The valve body one is cylindrical, and the valve core one is sealingly and slidingly connected inside the valve body one; the connecting seat one is sealingly fixed at one end of the valve body one and is spaced apart from the valve core one; the valve pad one is located between the connecting seat one and the valve core one and is coaxially arranged with the three, and fluid channels communicating with each other are formed at the corresponding axial centers of the three; one end of the valve pad one is embedded in the end of the valve core one, and the end face of the other end is sealingly abutted against the fluid channel port of the corresponding connecting seat one; the top pin is slidingly sealed inside the valve core one, and the tip of the top pin can abut and block the fluid channel port of the corresponding valve pad one; one end of the fastening sleeve body is threadedly connected inside the other end of the valve body one and abuts against the end of the valve core one away from the connecting seat one; the pressure adjusting assembly is arranged inside the fastening sleeve body, and the end thereof abuts against the tail end of the top pin to adjust the abutting pressure between the top pin and the valve pad one.

[0018] A radial unloading channel one is formed in the circumferential side wall of the valve core one, and the radial unloading channel one communicates with the fluid channel at the axial center of the valve core one.

[0019] A radial unloading channel two that can communicate with the radial unloading channel one is formed in the circumferential side wall of the valve body one at the position corresponding to the radial unloading channel one.

[0020] The fastening sleeve body abuts and presses the valve core one to the side of the connecting seat one, so that the contact force of the valve pad one and the connecting seat one is adjustable, the radial sealing of the contact surface of the valve pad one and the connecting seat one is achieved, and the applicability of the back pressure valve to super-high pressure or high pressure control conditions is achieved; the valve pad one is embedded in the end of the valve core one, which is beneficial to ensuring the coaxial assembly precision with the valve core one and further ensuring the assembly precision of the valve pad one and the top pin.

[0021] As a further improvement of the above technical solution, the pressure regulating assembly comprises a ejector pin seat, a spring, a spring seat and a back pressure adjusting screw.

[0022] The ejector pin seat, the spring and the spring seat are movably arranged inside the fastening sleeve; the two ends of the spring are respectively in abutment with the ejector pin seat and the spring seat; the ejector pin seat is arranged in axial spacing with the valve core; the tail end of the ejector pin extends out of the valve core and penetrates into the inside of the fastening sleeve to be in abutment with the ejector pin seat; the back pressure adjusting screw is threadedly connected at the end of the fastening sleeve away from the valve core and is in abutment with the spring seat to adjust the compression amount of the spring.

[0023] The compression amount of the spring is adjusted by the back pressure adjusting screw, so that the abutting force of the ejector pin and the valve pad is realized, and the effect that the back pressure threshold of the back pressure valve is flexibly adjustable is achieved.

[0024] As a further improvement of the above technical solution, the pipeline assembly further comprises a high-pressure tee, a high-pressure pipe one, a high-pressure pipe two and a high-pressure pipe three; one end of the high-pressure pipe one is fixedly connected and communicated with the outlet of the high-pressure stop valve, and the other end is fixedly connected and communicated with the passage port one of the high-pressure tee; one end of the high-pressure pipe two is fixedly connected and communicated with the high-pressure cylinder, and the other end is fixedly connected and communicated with the passage port two of the high-pressure tee; one end of the high-pressure pipe three is fixedly connected and communicated with the fluid passage inlet of the connecting seat one, and the other end is fixedly connected and communicated with the passage port three of the high-pressure tee; the one-way valve is installed at the end of the high-pressure pipe one corresponding to the high-pressure stop valve.

[0025] The high-pressure tee, the high-pressure pipe one, the high-pressure pipe two and the high-pressure pipe three are used to connect and communicate the supercharger, the high-pressure stop valve and the back pressure valve, which is conducive to the layout design of the overall structure of the slow pressure relief system.

[0026] As a further improvement of the above technical solution, the high-pressure pipe three is provided with a high-pressure pressure gauge and / or a pressure sensor. The high-pressure pressure gauge and / or the pressure sensor are used to monitor the pressure state in the high-pressure cylinder, the back pressure valve and the connected pipeline.

[0027] As a further improvement of the above technical solution, the high-pressure stop valve comprises a valve body two, a connecting seat two, a valve pad two, a ball, a ejector rod assembly;

[0028] The valve body two is provided with a mounting through hole, and the mounting through hole comprises a connecting seat mounting hole, a ball mounting hole and a ejector rod assembly mounting hole which are communicated in sequence; the hole diameter of the ball mounting hole is smaller than the hole diameters of the connecting seat mounting hole and the ejector rod assembly mounting hole;

[0029] The top rod assembly is movably and sealingly arranged in the top rod assembly mounting hole; the ball is movably arranged in the ball mounting hole; the valve pad two is arranged on the bottom of the connecting seat mounting hole; one end of the connecting seat two is threadedly connected in the connecting seat mounting hole, and the valve pad two is pressed against the bottom of the connecting seat mounting hole and blocks the opening of the corresponding ball mounting hole;

[0030] The connecting seat two and the valve pad two are provided with discharge flow through holes corresponding to the ball mounting hole and communicating with each other in the axial direction; one end of the top rod assembly corresponding to the ball can penetrate into the ball mounting hole and abut against the ball, so as to press and block the discharge flow through hole of the valve pad two; the outer wall surface of the valve body two is provided with a discharge flow passage three corresponding to the ball and communicating with the ball mounting hole.

[0031] Another aspect of the present application provides a hydraulic superhigh pressure slow pressure relief method, comprising the above-mentioned hydraulic superhigh pressure slow pressure relief device, comprising the following steps:

[0032] Step 1: set the back pressure threshold of the back pressure valve to be greater than the initial pressure value of the slow pressure relief of the superhigh pressure container;

[0033] Step 2: when the slow pressure relief of the superhigh pressure container is needed, open the high pressure stop valve, so that the medium liquid in the superhigh pressure container enters the high pressure cylinder of the booster through the one-way valve, and the maximum working pressure of the high pressure cylinder can be set through the back pressure valve;

[0034] Step 3: adjust the opening size of the flow control valve to control the oil discharge speed or flow of the low pressure cylinder, and then control the speed or flow of the medium liquid in the superhigh pressure container entering the high pressure cylinder, so as to realize the slow pressure relief control;

[0035] Step 4: the booster pressurizes, and the medium liquid in the high pressure cylinder is pressurized to be greater than the back pressure threshold set by the back pressure valve, so as to discharge the medium liquid.

[0036] As a further improvement of the above technical solution, the low pressure cylinder and the high pressure cylinder are coaxially arranged; the piston is sealingly and slidably connected in the low pressure cylinder; the plunger is sealingly and slidably connected in the high pressure cylinder; one end of the plunger extends into the low pressure cylinder and is fixed with the piston; the piston divides the low pressure cylinder into low pressure cylinder one and low pressure cylinder two;

[0037] The control mechanism further comprises an electromagnetic reversing valve, a one-way throttle valve, an oil return tank, a second pipeline, a third pipeline and an oil pump;

[0038] The electromagnetic reversing valve has a first oil outlet, a second oil outlet, an oil inlet and an oil return port; the first oil outlet is communicated to the low pressure cylinder one through the second pipeline, and the second oil outlet is communicated to the low pressure cylinder two through the third pipeline; the outlet of the oil pump is communicated with the oil inlet, and the oil return tank is communicated with the oil return port.

[0039] The one-way throttle valve is installed on the second pipeline to control the oil return speed of the low-pressure cylinder one;

[0040] When the pressure in the super-high pressure container is reduced to a low pressure state, the medium hydraulic pressure in the high-pressure cylinder of the supercharger cannot push the plunger to drive the piston to retreat, and the active return of the supercharger needs to be controlled, and the specific steps are as follows:

[0041] Step one: adjust the one-way throttle valve, control the electromagnetic reversing valve, make the low-pressure cylinder two communicate with the oil pump, and the low-pressure cylinder one communicate with the oil return tank, pressurize the low-pressure cylinder two through the oil pump, and the oil in the low-pressure cylinder two will push the piston to drive the plunger to retreat; adjust the oil return flow of the one-way throttle valve to control the retreat speed of the piston and the plunger, thereby controlling the medium liquid inflow of the high-pressure cylinder of the supercharger, and achieving slow pressure relief of the super-high pressure container in the low pressure state;

[0042] Step two: when the piston retreats to the bottom, control the electromagnetic reversing valve to make the low-pressure cylinder two communicate with the oil return tank, and the low-pressure cylinder one communicate with the oil pump; make the piston advance quickly and push the plunger to advance, and the low-pressure cylinder two returns oil, and the medium liquid in the high-pressure cylinder is discharged through the back pressure valve; after the piston drives the plunger to advance to the position, repeat step one to slow down the pressure relief of the super-high pressure container.

[0043] Through the above technical solution, compared with the prior art, the present application provides a kind of hydraulic super-high pressure slow pressure relief device and slow pressure relief method, with the following advantages and beneficial effects:

[0044] 1. The present application uses the supercharger reversely to directly convert the medium liquid in the super-high pressure container from super-high pressure or high pressure state to indirect pressure relief, indirectly controls the high pressure small flow of the high-pressure cylinder by controlling the low pressure large flow of the low-pressure cylinder of the supercharger, reduces the control difficulty, improves the control precision, and easily realizes high-precision and stable slow pressure relief.

[0045] 2. The present application uses the passive return of the supercharger to realize controllable slow pressure relief of high pressure, and uses the active return of the supercharger to realize controllable slow pressure relief of low pressure. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creating any creative labor.

[0047] Fig. 1 The present application is a kind of hydraulic super-high pressure slow pressure relief device overall structure schematic diagram;

[0048] Fig. 2 The application is a hydraulic superhigh pressure slow pressure relief device back pressure valve structure schematic diagram;

[0049] Fig. 3 The application is a hydraulic superhigh pressure slow pressure relief device high pressure stop valve schematic diagram;

[0050] Fig. 4 The application is a hydraulic superhigh pressure slow pressure relief device top rod assembly schematic diagram;

[0051] Fig. 5 The application is a hydraulic superhigh pressure slow pressure relief device working principle schematic diagram;

[0052] In the figure: 1, booster; 11, high pressure cylinder; 12, low pressure cylinder; 121, low pressure cylinder one; 122, low pressure cylinder two; 13, piston; 14, plunger; 2, control mechanism; 21, flow control valve; 22, electromagnetic reversing valve; 23, one-way throttle valve; 24, oil return tank; 25, first pipeline; 26, second pipeline; 27, third pipeline; 28, oil pump; 3, back pressure valve; 31, valve body one; 311, radial unloading channel two; 32, connecting seat one; 33, valve core one; 331, radial unloading channel one; 332, annular groove; 333, blind hole; 34, valve pad one; 35, thimble; 36, fastening sleeve body; 37, pressure adjusting assembly; 371, thimble seat; 372, spring; 373, spring seat; 374, back pressure adjusting screw; 4, high pressure stop valve; 41, valve body two; 411, connecting seat mounting hole; 412, ball mounting hole; 413, top rod assembly mounting hole; 4131, top rod head through hole; 4132, sealing element mounting hole; 4133, threaded sleeve mounting hole; 414, unloading channel three; 42, connecting seat two; 43, valve pad two; 44, ball; 45, top rod assembly; 451, top rod; 452, high pressure sealing element; 4521, annular sealing ring; 4522, annular sealing plate; 453, threaded sleeve body; 454, rotary driver; 5, pipeline assembly; 51, high pressure tee; 511, channel port one; 512, channel port two; 513, channel port three; 52, high pressure pipe one; 53, high pressure pipe two; 54, high pressure pipe three; 6, one-way valve; 7, superhigh pressure container; 8, high pressure pressure gauge; 9, pressure sensor. DETAILED DESCRIPTION

[0053] Embodiments of the application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application.

[0054] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] like Figs. 1 to 5 As shown, a hydraulic ultra-high pressure slow depressurization device includes: a booster 1, a control mechanism 2, a back pressure valve 3, and a high pressure shut-off valve 4; the inlet end of the high pressure shut-off valve 4 is connected to the medium discharge port of the ultra-high pressure vessel 7 to block or open the medium discharge port of the ultra-high pressure vessel 7.

[0058] The booster 1 is a single-acting reciprocating hydraulic booster, which includes a high-pressure cylinder 11 and a low-pressure cylinder 12; the outlet end of the high-pressure shut-off valve 4 is equipped with a one-way valve 6 that can prevent the medium of the high-pressure cylinder 11 from flowing back to the ultra-high pressure vessel; the high-pressure cylinder 11 is connected to the port of the one-way valve 6 away from the high-pressure shut-off valve 4 through a pipeline.

[0059] The control mechanism 2 includes a flow control valve 21, which is connected to the low-pressure cylinder 12. When the ultra-high pressure vessel 7 is depressurized, the flow control valve 21 controls the speed or flow rate of the oil discharge from the low-pressure cylinder 12, thereby controlling the speed or flow rate of the medium liquid in the ultra-high pressure vessel 7 being collected into the high-pressure cylinder 11.

[0060] Back pressure valve 3 is connected to high pressure cylinder 11 through a pipeline so that when high pressure cylinder 11 is pressurized, the medium liquid collected inside high pressure cylinder 11 is discharged through back pressure valve 3.

[0061] The application adopts the method of reversely using the supercharger to realize slow pressure relief, controls the liquid inlet speed or liquid inlet flow of the high-pressure cylinder of the supercharger by controlling the oil discharge speed or oil discharge flow of the low-pressure cylinder of the supercharger, and converts the flow or flow speed control at the end of the superhigh-pressure container into the oil discharge speed control of the low-pressure cylinder of the supercharger, so that the technical problem of difficult direct pressure relief of high-pressure or superhigh-pressure medium liquid is solved; the technical scheme of the application realizes controllable slow pressure relief by indirectly relieving the superhigh pressure through the flow control valve 21 to indirectly control the small flow liquid inlet of the high-pressure cylinder of the supercharger; the pressure threshold of the back pressure valve 3 is set to be greater than the initial pressure value of the superhigh-pressure container, so that the medium liquid discharged from the superhigh-pressure container can be collected in the high-pressure cylinder 11; when the supercharger is positively supercharged, the one-way valve 6 can prevent the medium liquid from flowing back to the superhigh-pressure container, and when the pressure in the high-pressure cylinder 11 is greater than the pressure threshold of the back pressure valve 3, the medium liquid can be quickly discharged through the back pressure valve 3; the process is repeated to realize continuous slow pressure relief.

[0062] Preferably, the low-pressure cylinder 12 is coaxially arranged with the high-pressure cylinder 11; the piston 13 is sealingly and slidably connected in the low-pressure cylinder 12; the plunger 14 is sealingly and slidably connected in the high-pressure cylinder 11; one end of the plunger 14 extends into the low-pressure cylinder 12 and is fixed with the piston 13; the piston 13 divides the low-pressure cylinder 12 into the low-pressure cylinder one 121 and the low-pressure cylinder two 122;

[0063] The control mechanism 2 further comprises an electromagnetic reversing valve 22, a one-way throttling valve 23, an oil return tank 24, a first pipeline 25, a second pipeline 26, a third pipeline 27, and an oil pump 28; the low-pressure cylinder one 121 is communicated with the oil return tank 24 through the first pipeline 25; the flow control valve 21 is installed on the first pipeline 25;

[0064] The electromagnetic reversing valve 22 is a two-position four-way electromagnetic reversing valve, which has a first oil outlet, a second oil outlet, an oil inlet, and an oil return; the first oil outlet is communicated to the low-pressure cylinder one 121 through the second pipeline 26, and the second oil outlet is communicated to the low-pressure cylinder two 122 through the third pipeline 27; the outlet of the oil pump 28 is communicated with the oil inlet, and the oil return tank 24 is communicated with the oil return; the inlet of the oil pump 28 is communicated with the oil return tank 24;

[0065] The one-way throttling valve 23 is installed on the second pipeline 26 to control the oil return speed of the low-pressure cylinder one 121.

[0066] When the super-high pressure container is in the super-high pressure or high pressure state, the medium hydraulic pressure discharged into the high pressure cylinder 11 can push the plunger 14 and the piston 13 to retreat, and the discharge speed or flow of the low pressure cylinder one 121 can be controlled by controlling the flow control valve 21, so as to achieve slow pressure relief; when the super-high pressure container is in the medium pressure and low pressure state, the medium hydraulic pressure discharged into the high pressure cylinder 11 cannot push the plunger 14 and the piston 13 to retreat, and the low pressure cylinder two 122 can be pressurized by the oil pump 28 to assist in pushing the plunger 14 and the piston 13 to retreat, and the discharge speed or flow of the low pressure cylinder one 121 can be controlled by the one-way throttling valve 23, so as to achieve slow pressure relief.

[0067] Preferably, the back pressure valve 3 is an adjustable back pressure valve with adjustable high and low back pressure; the adjustable back pressure valve can be adapted to different pressure states of the super-high pressure container for slow pressure relief.

[0068] Preferably, the back pressure valve 3 comprises a valve body one 31, a connecting seat one 32, a valve core one 33, a valve pad one 34, a thimble 35, a fastening sleeve body 36 and a pressure adjusting assembly 37.

[0069] The valve body one 31 is a cylindrical structure, and the valve core one 33 is sealingly and slidably connected in the valve body one 31; one end of the connecting seat one 32 is threadedly connected and sealingly fixed to one end of the valve body one 31, and the connecting seat one 32 is spaced apart from the valve core one 33; the valve pad one 34 is located between the connecting seat one 32 and the valve core one 33 and is coaxially arranged with the three, and fluid passages communicating with each other are formed in the corresponding axial centers; the fluid passage of the valve pad one 34 has a smaller inner diameter than the fluid passage of the connecting seat one 32; the valve core one 33 has a mounting hole adapted to the valve pad one 34 at the end corresponding to one side of the connecting seat one 32; one end of the valve pad one 34 is embedded in the mounting hole of the end of the valve core one 33, and the end face of the other end is sealingly abutted against the fluid passage port of the corresponding connecting seat one 32; the thimble 35 is sealingly and slidably arranged in the valve core one 33, and the sharp end of the thimble 35 can abut and block the fluid passage port of the corresponding valve pad one 34; one end of the fastening sleeve body 36 is threadedly connected to the other end of the valve body one 31 and abuts against the end of the valve core one 33 away from the connecting seat one 32; the pressure adjusting assembly 37 is arranged in the fastening sleeve body 36, and the end thereof abuts against the tail end of the thimble 35 to adjust the abutting pressure between the thimble 35 and the valve pad one 34;

[0070] A radial discharge passage one 331 is formed in the circumferential side wall of the valve core one 33, and the radial discharge passage one 331 communicates with the fluid passage at the axial center of the valve core one 33;

[0071] A radial discharge passage two 311 communicating with the radial discharge passage one 331 is formed in the circumferential side wall of the valve body one 31 at the position corresponding to the radial discharge passage one 331.

[0072] The fastening sleeve body 36 presses the valve core 33 to the side of the connecting seat 32, realizes the adjustable contact force between the valve pad 34 and the connecting seat 32, achieves the radial sealing of the contact surface between the valve pad 34 and the connecting seat 32, realizes the applicability of the back pressure valve 3 to the ultra-high pressure or high pressure control condition, the valve pad 34 is embedded in the end of the valve core 33, which is beneficial to guarantee the coaxial assembly precision of the valve pad 34 and the valve core 33, and further ensures the cooperation precision of the valve pad 34 and the top pin 35, the valve pad 34 and the top pin 35 can be individually disassembled, replaced and maintained, and the valve pad 34 with different fluid passage diameters and the matched top pin 35 can also be selected to realize the opening size requirement of the high pressure back pressure valve, so as to adapt to the high pressure control precision requirement.

[0073] Preferably, the valve core 33 has an annular groove 332 corresponding to the radial flow discharge channel 331 on the circumferential wall surface of the valve core 33; the annular groove 332 further connects the radial flow discharge channel 331 and the radial flow discharge channel 311.

[0074] Preferably, the end face of the valve core 33 close to the side of the connecting seat 32 has a blind hole 333, and the blind hole 333 is connected with the radial flow discharge channel 331. When the fastening sleeve body 36 is loosened, the contact surface between the valve pad 34 and the connecting seat 32 can be separated, the medium liquid can flow through the fluid passage of the axial center of the connecting seat 32 to the blind hole 333, and then discharged to the outside of the back pressure valve 3 through the radial flow discharge channel 331, the annular groove 332 and the radial flow discharge channel 311.

[0075] Preferably, the pressure adjusting assembly 37 comprises a top pin seat 371, a spring 372, a spring seat 373 and a back pressure adjusting screw 374.

[0076] The top pin seat 371, the spring 372 and the spring seat 373 are movably arranged in the fastening sleeve body 36; the two ends of the spring 372 are respectively in abutment with the top pin seat 371 and the spring seat 373; the top pin seat 371 is arranged in axial spacing with the valve core 33; the tail end of the top pin 35 extends to the outside of the valve core 33 and penetrates into the inside of the fastening sleeve body 36 to abut with the top pin seat 371; the back pressure adjusting screw 374 is threadedly connected to the end of the fastening sleeve body 36 away from the valve core 33 and abuts with the spring seat 373 to adjust the compression amount of the spring 372.

[0077] The compression amount of the spring 372 is adjusted by the back pressure adjusting screw 374, so as to realize the abutting force between the top pin 35 and the valve pad 34, and achieve the flexible adjustable effect of the back pressure threshold value of the back pressure valve 3.

[0078] Preferably, the pipeline assembly 5 further comprises a high-pressure tee 51, a high-pressure pipe 1 52, a high-pressure pipe 2 53 and a high-pressure pipe 3 54; one end of the high-pressure pipe 1 52 is fixedly connected and communicated with the outlet of the high-pressure stop valve 4, and the other end is fixedly connected and communicated with a passage port 1 511 of the high-pressure tee 51; one end of the high-pressure pipe 2 53 is fixedly connected and communicated with the high-pressure cylinder 11, and the other end is fixedly connected and communicated with a passage port 2 512 of the high-pressure tee 51; one end of the high-pressure pipe 3 54 is fixedly connected and communicated with the fluid passage inlet of the connecting seat 1 32, and the other end is fixedly connected and communicated with a passage port 3 513 of the high-pressure tee 51; the one-way valve 6 is installed at the end of the high-pressure pipe 1 52 corresponding to the side of the high-pressure stop valve 4.

[0079] The high-pressure tee 51, the high-pressure pipe 1 52, the high-pressure pipe 2 53 and the high-pressure pipe 3 54 are used to connect and communicate the pressure booster 1, the high-pressure stop valve 4 and the back pressure valve 3, which is conducive to the layout design of the overall structure of the slow pressure relief system.

[0080] Preferably, the high-pressure pipe 3 54 is provided with a high-pressure pressure gauge 8 and / or a pressure sensor 9. The high-pressure pressure gauge 8 and / or the pressure sensor 9 are used to monitor the pressure state in the high-pressure cylinder 11, the back pressure valve 3 and the pipeline connected therewith.

[0081] Preferably, the high-pressure stop valve 4 comprises a valve body 2 41, a connecting seat 2 42, a valve pad 2 43, a ball 44 and a top rod assembly 45.

[0082] The valve body 2 41 is provided with a mounting through hole comprising a connecting seat mounting hole 411, a ball mounting hole 412 and a top rod assembly mounting hole 413 communicated in sequence; the hole diameter of the ball mounting hole 412 is smaller than the hole diameters of the connecting seat mounting hole 411 and the top rod assembly mounting hole 413;

[0083] The top rod assembly 45 is movably and sealingly arranged in the top rod assembly mounting hole 413; the ball 44 is movably arranged in the ball mounting hole 412; the valve pad 2 43 is arranged at the bottom of the connecting seat mounting hole 411; one end of the connecting seat 2 42 is threadedly connected in the connecting seat mounting hole 411, and the valve pad 2 43 is pressed against the bottom of the connecting seat mounting hole 411 and seals the hole opening of the corresponding ball mounting hole 412;

[0084] The connecting seat 2 42 and the valve pad 2 43 are both provided with a drainage through hole communicated with each other in the axial direction corresponding to the ball mounting hole 412; one end of the top rod assembly 45 corresponding to the ball 44 can penetrate into the ball mounting hole 412 and abut against the ball 44 to press and seal the drainage through hole of the valve pad 2 43; the outer wall surface of the valve body 2 41 is provided with a drainage passage 3 414 communicated with the ball mounting hole 412 at the position corresponding to the ball 44.

[0085] Specifically, the top rod assembly mounting hole 413 includes a top rod head penetrating hole 4131, a sealing element mounting hole 4132, and a threaded sleeve mounting hole 4133 arranged in sequence and in communication with each other; the hole diameter of the top rod head penetrating hole 4131 is smaller than that of the sealing element mounting hole 4132, and the hole diameter of the sealing element mounting hole 4132 is smaller than that of the threaded sleeve mounting hole 4133.

[0086] The top rod assembly 45 includes a top rod 451, a high-pressure sealing element 452, a threaded sleeve body 453, and a rotary driver 454; the high-pressure sealing element 452 includes an annular sealing ring 4521 and an annular sealing plate 4522; the annular sealing ring 4521 is mounted at the bottom of the sealing element mounting hole 4132, one end of the annular sealing plate 4522 abuts against the side of the annular sealing ring 4521 away from the bottom of the sealing element mounting hole 4132, and the other end of the annular sealing plate 4522 extends to the inside of the threaded sleeve mounting hole 4133;

[0087] The threaded sleeve body 453 has internal and external threads, one end of the threaded sleeve body 453 is threadedly connected in the threaded sleeve mounting hole 4133 and abuts against the annular sealing plate 4522, and the other end of the threaded sleeve body 453 extends to the outside of the valve body two 41. The threaded sleeve body 453 can press the annular sealing plate 4522 and the annular sealing ring 4521 against the bottom of the sealing element mounting hole 4132, thereby achieving liquid sealing of the medium in the high-pressure state.

[0088] One end of the top rod 451 is located in the top rod head penetrating hole 4131 and is slidingly sealed through the annular sealing ring 4521 and the annular sealing plate 4522 and extends to the ball mounting hole 412 to abut against the ball 44; the other end of the top rod 451 is threadedly connected in the threaded sleeve body 453 and extends to the outside of the threaded sleeve body 453; the end of the top rod 451 located outside the threaded sleeve body 453 is fixedly connected with the rotary driver 454; the rotary driver 454 can be a hand wheel or other forms of electric rotary driver.

[0089] A hydraulic super-high-pressure slow pressure relief method includes a hydraulic super-high-pressure slow pressure relief device of the above-mentioned embodiment, and includes the following steps:

[0090] Step 1: Set the back pressure threshold value of the back pressure valve 3 to be greater than the initial slow pressure relief pressure value of the super-high-pressure container; ensure that the back pressure valve 3 can prevent the medium liquid from being discharged when the initial pressure relief of the super-high-pressure container is performed.

[0091] Step 2: When slow pressure relief of the super-high-pressure container is required, open the high-pressure stop valve 4 to make the medium liquid in the super-high-pressure container enter the high-pressure cylinder 11 of the intensifier 1 through the one-way valve 6, and the maximum working pressure of the high-pressure cylinder 11 can be set through the back pressure valve 3.

[0092] Step 3: Adjust the opening of the flow control valve 21 to control the oil discharge speed or flow rate of the low-pressure cylinder 12, thereby controlling the speed or flow rate of the medium liquid entering the high-pressure cylinder 11 of the ultra-high-pressure vessel 7, and realizing slow pressure relief control.

[0093] Specifically, by controlling and adjusting the opening of the flow control valve 21, the medium liquid in the ultra-high pressure container, which is in an ultra-high pressure or high pressure state, will continuously push the plunger 14 in the high-pressure cylinder 11 and drive the piston 13 in the low-pressure cylinder 12 to passively retract. The booster 1 will passively return, so that pressure is generated in the low-pressure cylinder 12 and oil is discharged. By controlling the oil discharge speed or flow rate of the low-pressure cylinder 12, the retraction speed of the piston 13 and the plunger 14 can be controlled, thereby controlling the flow rate of the medium liquid entering the high-pressure cylinder 11, so that the medium liquid in the ultra-high pressure container slowly enters the high-pressure cylinder 11 to achieve slow depressurization.

[0094] Step 4: The booster (1) pressurizes the medium liquid in the high-pressure cylinder (11) to a level greater than the back pressure threshold set by the back pressure valve (3), thereby discharging the medium liquid.

[0095] Specifically, when piston 13 retracts to the bottom, flow control valve 21 is closed, causing piston 13 to advance rapidly and push plunger 14 forward. Check valve 6 prevents the medium liquid from flowing back into the ultra-high pressure vessel, pressurizing the medium liquid in high pressure cylinder 11 to a level greater than the back pressure threshold set by back pressure valve 3, and then discharging the medium liquid. After piston 13 drives plunger 14 to the position, flow control valve 21 is opened again to slowly depressurize the ultra-high pressure vessel, thus achieving continuous slow depressurization according to the depressurization speed requirements.

[0096] Preferably, when the pressure inside the ultra-high pressure vessel drops to a low-pressure state, and the pressure of the medium liquid entering the high-pressure cylinder 11 of the booster 1 is insufficient to push the plunger 14 to drive the piston 13 back, the booster 1 needs to be controlled to actively return. The specific steps are as follows:

[0097] Step 4.1: Adjust the one-way throttle valve 23 and control the solenoid directional valve 22 to connect the low-pressure cylinder 122 to the oil pump 28 and the low-pressure cylinder 121 to the return oil tank 24. The oil pump 28 pressurizes the low-pressure cylinder 122, and the oil in the low-pressure cylinder 122 pushes the piston 13 to drive the plunger 14 to retract. Adjust the one-way throttle valve 23 to control the return oil flow rate and control the retraction speed of the piston 13 and the plunger 14, thereby controlling the speed and flow rate of the medium entering the high-pressure cylinder 11 of the booster 1, and realizing the slow depressurization of the ultra-high pressure vessel.

[0098] Step 4.2: When the piston 13 is retracted to the bottom, the control electromagnetic reversing valve 22 is reversed to make the low-pressure cylinder two 122 communicate with the oil return tank 24 and the low-pressure cylinder one 121 communicate with the oil pump 28; the piston 13 is quickly advanced and pushes the plunger 14 to advance, the low-pressure cylinder two 122 returns oil, and the medium liquid in the high-pressure cylinder 11 is discharged through the back pressure valve 3; after the piston 13 drives the plunger 14 to advance to the position, step 4.1 is repeated to slowly release the pressure of the super-high pressure container.

[0099] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0100] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A hydraulic superhigh pressure slow pressure relief device connected to a superhigh pressure vessel, a medium discharge port of the superhigh pressure vessel being communicated with a high pressure stop valve (4), characterized by, The utility model relates to a kind of high-pressure hydraulic system, comprising: A booster (1), the booster (1) is single-acting reciprocating hydraulic booster, the booster (1) includes high-pressure cylinder (11) and low-pressure cylinder (12);The high-pressure stop valve (4) outlet end is provided with the one-way valve (6) that can prevent the medium of the high-pressure cylinder (11) backflow to the ultrahigh-pressure container;The high-pressure cylinder (11) is communicated with the port of the one-way valve (6) far from the high-pressure stop valve (4) side by pipeline; Control mechanism (2), the control mechanism (2) includes flow control valve (21), the flow control valve (21) is communicated with the low-pressure cylinder (12), to control the speed or flow of the low-pressure cylinder (12) when the ultrahigh-pressure container is decompressed in turn control the speed or flow of the medium of the ultrahigh-pressure container being collected into the high-pressure cylinder (11); Back pressure valve (3), the back pressure valve (3) is communicated with the high-pressure cylinder (11) by pipeline, to discharge the medium collected inside the high-pressure cylinder (11) when the high-pressure cylinder (11) is pressurized; The low-pressure cylinder (12) is coaxially arranged with the high-pressure cylinder (11);Piston (13) is sealingly and slidably connected in the low-pressure cylinder (12);The high-pressure cylinder (11) is sealingly and slidably connected with plunger (14);The plunger (14) extends to the low-pressure cylinder (12) and is fixed with the piston (13) in one end;The piston (13) divides the low-pressure cylinder (12) into low-pressure cylinder one (121) and low-pressure cylinder two (122); The control mechanism (2) further includes electromagnetic reversing valve (22), one-way throttle valve (23), oil return tank (24), first pipeline (25), second pipeline (26), third pipeline (27), oil pump (28);The low-pressure cylinder one (121) is communicated with the oil return tank (24) by the first pipeline (25);The flow control valve (21) is installed on the first pipeline (25); The electromagnetic reversing valve (22) has first oil outlet, second oil outlet, oil inlet and oil return port, the first oil outlet is communicated to the low-pressure cylinder one (121) by the second pipeline (26), the second oil outlet is communicated to the low-pressure cylinder two (122) by the third pipeline (27);The outlet of the oil pump (28) is communicated with the oil inlet, and the oil return tank (24) is communicated with the oil return port; The one-way throttle valve (23) is installed on the second pipeline (26) to control the oil return speed of the low-pressure cylinder one (121).

2. The hydraulic superhigh pressure slow pressure relief device according to claim 1, wherein The back pressure valve (3) is adjustable back pressure high and low adjustable back pressure valve.

3. The hydraulic superhigh pressure slow pressure relief device according to claim 2, characterized in that, The back pressure valve (3) includes valve body one (31), valve core one (33), connecting seat one (32), valve pad one (34), top pin (35), fastening sleeve body (36) and pressure regulating assembly (37); The valve body one (31) is cylindrical; the valve core one (33) is sealingly and slidingly connected inside the valve body one (31); the connecting seat one (32) is sealingly fixed at one end of the valve body one (31) and is arranged in a spaced manner with the valve core one (33); the valve pad one (34) is located between the connecting seat one (32) and the valve core one (33) and is coaxially arranged, and fluid channels communicating with each other are formed at the corresponding axial centers; one end of the valve pad one (34) is embedded in the end of the valve core one (33), and the end face of the other end is sealingly abutted against the fluid channel port of the corresponding connecting seat one (32); the thimble (35) is slidingly sealed inside the valve core one (33), and the thimble (35) can abut against and block the fluid channel port of the corresponding valve pad one (34); one end of the fastening sleeve (36) is threadedly connected inside the other end of the valve body one (31) and abutted against the end of the valve core one (33) away from the connecting seat one (32); the pressure adjusting assembly (37) is arranged inside the fastening sleeve (36), and the end thereof is abutted against the tail end of the thimble (35) to adjust the pressing force between the thimble (35) and the valve pad one (34); The radial unloading channel one (331) is formed on the circumferential side wall of the valve core one (33) and communicates with the fluid channel at the axial center of the valve core one (33); The radial unloading channel two (311) communicating with the radial unloading channel one (331) is formed on the circumferential side wall of the valve body one (31) at the position corresponding to the radial unloading channel one (331).

4. The hydraulic superhigh pressure slow pressure relief device according to claim 3, characterized in that, The pressure adjusting assembly (37) comprises a thimble seat (371), a spring (372), a spring seat (373) and a back pressure adjusting screw (374); The thimble seat (371), the spring (372) and the spring seat (373) are movably arranged inside the fastening sleeve (36); the two ends of the spring (372) are respectively abutted against the thimble seat (371) and the spring seat (373); the thimble seat (371) and the valve core one (33) are arranged in an axial spaced manner; the tail end of the thimble (35) extends out of the valve core one (33) and penetrates into the fastening sleeve (36) to abut against the thimble seat (371); the back pressure adjusting screw (374) is threadedly connected at the end of the fastening sleeve (36) away from the valve core one (33) and abutted against the spring seat (373) to adjust the compression amount of the spring (372).

5. The hydraulic superhigh pressure slow pressure relief device according to claim 4, wherein Also include pipeline components (5), the pipeline components (5) include high pressure tee (51), high pressure pipe one (52), high pressure pipe two (53) and high pressure pipe three (54); One end of the high pressure pipe one (52) is fixedly connected and communicated with the outlet of the high pressure stop valve (4), the other end is fixedly connected and communicated with the channel port one (511) of the high pressure tee (51); One end of the high pressure pipe two (53) is fixedly connected and communicated with the high pressure cylinder (11), the other end is fixedly connected and communicated with the channel port two (512) of the high pressure tee (51); One end of the high pressure pipe three (54) is fixedly connected and communicated with the fluid channel inlet of the connecting seat one (32), the other end is fixedly connected and communicated with the channel port three (513) of the high pressure tee (51); The one-way valve (6) is installed on the end of the high pressure pipe one (52) corresponding to one side of the high pressure stop valve (4).

6. The hydraulic superhigh pressure slow pressure relief device according to claim 5, wherein The high pressure pipe three (54) is provided with a high pressure gauge (8) and / or a pressure sensor (9).

7. The hydraulic superhigh pressure slow pressure relief device according to claim 1, wherein The high pressure stop valve (4) includes a valve body two (41), a connecting seat two (42), a valve pad two (43), a ball (44) and a top rod assembly (45). The valve body two (41) has an installation through hole, the installation through hole includes a connecting seat installation hole (411), a ball installation hole (412) and a top rod assembly installation hole (413) communicated in sequence; The hole diameter of the ball installation hole (412) is smaller than the hole diameters of the connecting seat installation hole (411) and the top rod assembly installation hole (413); The top rod assembly (45) is movably and sealingly arranged in the top rod assembly installation hole (413); The ball (44) is movably arranged in the ball installation hole (412); The valve pad two (43) is arranged at the bottom of the connecting seat installation hole (411); One end of the connecting seat two (42) is threadedly connected in the connecting seat installation hole (411), and the valve pad two (43) is pressed against the bottom of the connecting seat installation hole (411) and blocks the hole of the corresponding ball installation hole (412); The connecting seat two (42) and the valve pad two (43) are provided with flow discharging through holes communicated with each other in the axial direction corresponding to the ball installation hole (412); One end of the top rod assembly (45) corresponding to the ball (44) can penetrate into the ball installation hole (412) and abut against the ball (44), so as to press and block the flow discharging through hole of the valve pad two (43); The valve body two (41) is provided with a flow discharging channel three (414) communicated with the ball installation hole (412) on the outer wall surface corresponding to the ball (44).

8. A hydraulic superhigh pressure slow pressure relief method, characterized by, The hydraulic superhigh pressure slow pressure relief device includes the following steps: Step 1: set the back pressure threshold value of the back pressure valve (3) to be greater than the initial pressure relief pressure value of the superhigh pressure container; Step 2: when slow pressure relief of the super-high pressure container needs to be performed, the high-pressure stop valve (4) is opened, and the medium liquid in the super-high pressure container enters the high-pressure cylinder (11) of the supercharger (1) through the one-way valve (6), and the maximum working pressure of the high-pressure cylinder (11) can be set through the back pressure valve (3); Step 3: the opening size of the flow control valve (21) is adjusted to control the oil discharge speed or flow of the low-pressure cylinder (12), and then the speed or flow of the medium liquid in the super-high pressure container entering the high-pressure cylinder (11) is controlled, so that slow pressure relief control is realized; Step 4: the supercharger (1) is pressurized, and the medium liquid in the high-pressure cylinder (11) is pressurized to be greater than the back pressure threshold set by the back pressure valve (3), so that the medium liquid is discharged.

9. The hydraulic superhigh pressure slow pressure relief method according to claim 8, characterized by, The low-pressure cylinder (12) and the high-pressure cylinder (11) are coaxially arranged; the piston (13) is sealingly and slidably connected in the low-pressure cylinder (12); the plunger (14) is sealingly and slidably connected in the high-pressure cylinder (11); one end of the plunger (14) extends into the low-pressure cylinder (12) and is fixed with the piston (13); the piston (13) divides the low-pressure cylinder (12) into a low-pressure cylinder one (121) and a low-pressure cylinder two (122); The control mechanism (2) further comprises an electromagnetic reversing valve (22), a one-way throttle valve (23), an oil return tank (24), a second pipeline (26), a third pipeline (27), and an oil pump (28); The electromagnetic reversing valve (22) has a first oil outlet, a second oil outlet, an oil inlet, and an oil return port; the first oil outlet is communicated to the low-pressure cylinder one (121) through the second pipeline (26); the second oil outlet is communicated to the low-pressure cylinder two (122) through the third pipeline (27); the outlet of the oil pump (28) is communicated to the oil inlet; and the oil return tank (24) is communicated to the oil return port; The one-way throttle valve (23) is installed on the second pipeline (26) to control the oil return speed of the low-pressure cylinder one (121); When the pressure in the super-high pressure container is reduced to a low pressure state, the medium liquid pressure in the high-pressure cylinder (11) of the supercharger (1) cannot push the plunger (14) to drive the piston (13) to retreat, and the active return of the supercharger (1) needs to be controlled, and the specific steps are as follows: Step 1: adjust the one-way throttle valve (23) and control the electromagnetic reversing valve (22) to make the low-pressure cylinder two (122) communicated with the oil pump (28) and the low-pressure cylinder one (121) communicated with the oil return tank (24); the low-pressure cylinder two (122) is pressurized by the oil pump (28), and the oil liquid in the low-pressure cylinder two (122) pushes the piston (13) to drive the plunger (14) to retreat; the oil return flow of the one-way throttle valve (23) is adjusted to control the retreat speed of the piston (13) and the plunger (14), so that the medium liquid entering flow of the high-pressure cylinder (11) of the supercharger (1) is controlled, and slow pressure relief in the low pressure state of the super-high pressure container is realized. Step two: when the piston (13) back to the bottom, control electromagnetic reversing valve (22), low pressure cylinder two (122) and the oil tank (24) communication, low pressure cylinder one (121) and oil pump (28) communication; make piston (13) fast forward and push the plunger (14) forward, low pressure cylinder two (122) oil return, high pressure cylinder (11) medium liquid through the back pressure valve (3) discharge; piston (13) drive plunger (14) forward to the site, repeat step one for super high pressure vessel slow pressure relief.

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