CN103511404B - A kind of Automatic high pressure proportional controlling device and regulating method - Google Patents

Abstract

A kind of Automatic high pressure proportional controlling device of the present invention and regulating method, belong to technical field of static pressure measurement calibration.Comprise making and be installed with standby (1), supercharging ratio adjustment portion, oil conservator (6), release proportion adjustment part, oil extraction container (12), pressure transducer (14).Device of the present invention control rate compared with tradition list piston volume changing regulative mode can significantly improve.

Description

A kind of Automatic high pressure proportional controlling device and regulating method

Technical field

A kind of Automatic high pressure proportional controlling device of the present invention and regulating method, belong to technical field of static pressure measurement calibration.

Background technique

Liquid high pressure standard set-up common is at present piston gauge, it is made based on pascal's principle and Interval static analysis, it produces and regulates during pressure needs to load standard test weight, be difficult to realize automatic calibration, when carrying out multiple spot calibration to autoclave appts instrument, calibration efficiency is lower.Although had Self-pressurizing agri abroad, automatically added the full automatic piston pressure meter of counterweight and can realize Full-automatic calibration, the volume of these piston manometers is comparatively large, complex structure, expensive, is not suitable for field calibration.

The product that oil pressure medium controller is sensor technology, computer technology and fluid control technology combine, by the control to fluid, fast, accurately, stably goal pressure is produced, also show by measuring pressure by the Real-time Feedback of pressure transducer again simultaneously, thus realize the accurately control continuously to oil liquid pressure.

The core technology of oil pressure medium controller is exactly accurate Pressure Control Technology, and it is realized by the fine adjustment of convection cell.Its pressure regulating method mainly contains two kinds: flow rate adjusting method and capacity regulating method.Flow rate adjusting method is by increasing or reduce the adjustment realizing oil liquid pressure to the quality of fluid in closed containing cavity, the control pressurer system that this control mode adopts is simpler, but very high to the performance requirement of the valve carrying out flow control, the pressure that realize under high pressure accurately controls more difficult.Capacity regulating method is the movement by relief piston, the volume of the fluid of change closed containing cavity quality decided at the higher level but not officially announced realizes the control to oil liquid pressure, under high pressure have higher control accuracy, this compress control method adopts the pressure regulator based on single piston usually.In order to improve pressure controlled resolution, the diameter of single piston is generally no more than 10mm, for high pressure, when system carries out the adjustment of large-scale pressure, the regulating time of pressure can be made to become very long, can not meet the needs of high pressure measurement calibration.Therefore, based on conventional pressure controlling device and the regulating method of single piston structure, be difficult to the index simultaneously taking into account Stress control speed and this pair mutual restriction of Stress control resolution.

The present invention produces under above-mentioned technical background, and the present invention is in conjunction with the structure of needle-valve, and the mode of adoption rate Flow-rate adjustment, achieves the quick fine adjustment of any pressure spot within the whole pressure range ability from low pressure to high pressure.

Summary of the invention

The present invention seeks to solve capacity Pressure Control Technology in actual use to the problem that Stress control speed and Stress control resolution can not be taken into account simultaneously, a kind of Automatic high pressure proportional controlling device and regulating method are provided, the method control rate is fast, and control accuracy is high.

The object of the invention is to be achieved through the following technical solutions.

A kind of Automatic high pressure proportional controlling device of the present invention, comprises making and is installed with standby 1, supercharging ratio adjustment portion, oil conservator 6, release proportion adjustment part, oil extraction container 12, pressure transducer 14;

Described supercharging ratio adjustment portion, comprises booster electric machine 2, boost retarder 3, supercharging coupling 4, supercharging needle-valve 5;

Described release proportion adjustment part, comprises and unloads Medium-voltage Motor 8, release retarder 9, release coupling 10, release needle-valve 11;

Make to be installed with and be connected by oil circuit with the entrance of supercharging needle-valve 5 for 1, the outlet of supercharging needle-valve 5 is connected by oil circuit with the entrance of oil conservator 6, the outlet of oil conservator 6 is divided into three tunnels, wherein a road is connected by oil circuit with the entrance of release needle-valve 11, one tunnel is connected by oil circuit with pressure transducer 14, last road is connected by pipeline with test outlet 13, test outlet 13 and the autoclave appts Instrument connection be calibrated;

Booster electric machine 2, boost retarder 3, supercharging coupling 4 three coaxially connect, and supercharging coupling 4 is connected with the swingle A of supercharging needle-valve 5, supercharging coupling 4 and the synchronized rotation of swingle A;

Unload Medium-voltage Motor 8, release retarder 9, release coupling 10 three coaxially connect, release coupling 10 is connected with the swingle B of release needle-valve 11, release coupling 10 and the synchronized rotation of swingle B;

The outlet of release needle-valve 11 is connected by oil circuit with the entrance of oil extraction container 12;

Described supercharging needle-valve 5 comprises swingle 15, pilot sleeve 16, spool, connecting bolt 20, locking nut 21, T-shaped sealing shelves post 22, black box 23, oil outlet 25, set screw nut 27, needle valve body 28, limited step 29, fuel-displaced limiting holes 34;

Described spool is one of the forming processing, comprises guide spiro rod 17, spline four directions 19, mitre velve point 24; The top of spool is guide spiro rod 17, and the intermediate portion of spool is spline four directions 19, and the bottom of spool is mitre velve point 24;

Swingle 15 is positioned at pilot sleeve 16, can rotate in pilot sleeve 16 and move up and down;

Guide spiro rod 17 is positioned at swingle 15, and the two is threaded connection;

Connecting bolt 20 top is provided with positioning table 26, spline four directions 19 is limited by positioning table 26, when swingle 15 is rotated, guide spiro rod 17 15 not to rotate in swingle, ensure that whole spool can only move up and down less displacement in the Vertical direction in spline four directions, positioning table 26 and pilot sleeve 16 are fixed by set screw nut 27;

Needle valve body 28 for being threaded the cuboid in hole, limited location step 29 in tapped hole; Connecting bolt 20 is fixed in the tapped hole of needle valve body 28 by locking nut 21;

Mitre velve point 24 is positioned at the tapped hole of needle valve body 28; The upper part of mitre velve point 24 is coated with T-shaped sealing shelves post 22, and the lower part of mitre velve point 24 is coated with black box 23; Black box 23 above undertaken spacing by T-shaped sealing shelves post 22, black box 23 carry out spacing below by limited step 29;

The side of needle valve body 28 is with oil outlet 25, and the surrounding of oil outlet 25 is what seal;

The opposite side of needle valve body 28 is filler opening 30, and the surrounding of filler opening 30 is what seal;

The least significant end of the tapped hole of needle valve body 28 has fuel-displaced limiting holes 34.

The composition of described release needle-valve 11 is consistent with the composition of supercharging needle-valve 5.

The described major function be installed with for 1 of making is: for package unit provides initial pressure;

Described booster electric machine 2, the major function of unloading Medium-voltage Motor 8 are: be respectively two cover proportion adjustment parts and provide transmission;

The major function of described boost retarder 3, release retarder 9 is: reduce motor speed;

The major function of described supercharging coupling 4, release coupling 10 is: connection function, and upper end is connected with reducer output shaft, and lower end is connected with swingle;

The major function of described oil conservator 6 is: splendid attire fluid, pressure buffer;

Described oil circuit major function is: pressure transducer and needle-valve, make be installed with standby etc. between connect;

The major function of described oil extraction container 12 is: the fluid that splendid attire is discharged by release proportion adjustment part;

The major function of described pressure transducer 14 is: be used for measuring the pressure exported, and feedback signal;

The major function of described release needle-valve 11, supercharging needle-valve 5 is: rely on tapered valve point 24 moving up and down in fuel-displaced limiting holes 34 Vertical direction, regulate the fuel-displaced sectional area of fuel-displaced limiting holes 34, thus controls the fluid ratio of the system that enters and the system of discharge.

A kind of Automatic high pressure proportional regulating method of the present invention, increase proportion adjustment part, step is:

The rotating speed of booster electric machine is R, and the reduction speed ratio of boost retarder is N:1, and after slowing down, the rotating speed that can obtain swingle is RN, and Speed unit is r/s; If the swingle minimum rotation time is t, the angle that therefore swingle rotates within the minimum rotation time is the pitch of driving screw is L, so the distance △ l that driving screw advances or retreats in swingle, namely spool follows the rotating speed of motor to have following relation in the displacement that fuel-displaced limiting holes Vertical Square moves up:

$\mathrm{\Δl}=\mathrm{tL}\frac{R}{N}---1$

Oil outlet sectional area is designed to S ₀, set the position of fuel-displaced limiting holes just standard-sized sheet as controlling initial position, the angle of design tapered valve point is θ, and when spool is at the displacement △ l that fuel-displaced limiting holes Vertical direction moves down, the fuel-displaced sectional area S of oil outlet and △ l exists following relation:

$S=S_0-\mathrm{\π}{\left[\mathrm{tg}\left(\frac{\mathrm{\θ}}{2}\right)\mathrm{\Δl}\right]}^2---2$

Now, just reach proportion adjustment and be installed with the standby object entering the fluid flow of oil vessel by making.

Based on the pressure regulating method of Automatic high pressure proportional controlling device, when current pressure is less than target pressure value, operating process is as follows:

Step 1.1: release electric machine rotation, makes release needle-valve be in closed condition, starts to make to be installed with to make pressure for for system, according to current pressure and goal pressure gap, booster electric machine rotates, and regulates the fuel-displaced sectional area of fuel-displaced limiting holes, determine the fluid ratio needing to enter oil vessel, pressure increases;

Step 1.2: Real-time Feedback current pressure, current pressure and goal pressure gap less time, correspondingly reduce fuel-displaced sectional area, Pressure rise rates slows down, until delivery pressure is goal pressure.

Current pressure is greater than target pressure value, and operating process is as follows:

Step 2.1: booster electric machine rotates, supercharging needle-valve is made to be in closed condition, measure current pressure, when finding larger with goal pressure gap, unload Medium-voltage Motor to rotate, regulate release needle-valve, make release needle-valve be in the working position of standard-sized sheet, fluid enters oil extraction container through release needle-valve from oil vessel, and system pressure reduces;

Step 2.2: Real-time Feedback current pressure, current pressure and goal pressure gap very little time, the corresponding fuel-displaced sectional area reducing release needle-valve, pressure reduce speed slow down, until delivery pressure is goal pressure.

Beneficial effect:

1. the flow pressure control technique that current high pressure field adopts is combined, take into account the actual user demand of pressure measurement calibration equipment simultaneously, design needle valve structure, avoids high voltage variable Volume Control Technology to pressure regulation piston machine machining accuracy, problem that motor torque demands is high.

2. utilize flow control mode, obtain wider pressure regulation spectrum, compared with capacity regulative mode, do not need to process longer pressure regulation cavity, device overall volume can reduce 40%, and device is more portable, is more suitable for field calibration.

3., when accurate control ratio controlling device inlet pressure, this device control rate compared with tradition list piston volume changing regulative mode can significantly improve.

Accompanying drawing explanation

Fig. 1 is the structural representation of device of the present invention;

Fig. 2 is needle-valve cross-sectional view in device of the present invention;

Fig. 3 is tapered valve point working position signal in Automatic high pressure proportional controlling device of the present invention: Fig. 3 (a) is fuel-displaced limiting holes full-gear schematic diagram; Fig. 3 (b) is that fuel-displaced limiting holes limits fuel-displaced view; Fig. 3 (c) is fuel-displaced limiting holes full off state schematic diagram.

Embodiment

In order to technological scheme of the present invention is better described, below in conjunction with accompanying drawing 1,2,3, by 1 specific embodiment, the present invention will be further described.

Embodiment

As shown in Figure 1, a kind of Automatic high pressure proportional controlling device, comprises making and is installed with standby 1, supercharging ratio adjustment portion, oil conservator 6, release proportion adjustment part, oil extraction container 12, pressure transducer 14;

Described supercharging ratio adjustment portion, comprises booster electric machine 2, boost retarder 3, supercharging coupling 4, supercharging needle-valve 5;

Described release proportion adjustment part, comprises and unloads Medium-voltage Motor 8, release retarder 9, release coupling 10, release needle-valve 11;

Make to be installed with and be connected by oil circuit with the entrance of supercharging needle-valve 5 for 1, the outlet of supercharging needle-valve 5 is connected by oil circuit with the entrance of oil conservator 6, the outlet of oil conservator 6 is divided into three tunnels, wherein a road is connected by oil circuit with the entrance of release needle-valve 11, one tunnel is connected by oil circuit with pressure transducer 14, last road is connected by pipeline with test outlet 13, test outlet 13 and the autoclave appts Instrument connection be calibrated;

Booster electric machine 2, boost retarder 3, supercharging coupling 4 three coaxially connect, and supercharging coupling 4 is connected with the swingle A of supercharging needle-valve 5, supercharging coupling 4 and the synchronized rotation of swingle A;

Unload Medium-voltage Motor 8, release retarder 9, release coupling 10 three coaxially connect, release coupling 10 is connected with the swingle B of release needle-valve 11, release coupling 10 and the synchronized rotation of swingle B;

The outlet of release needle-valve 11 is connected by oil circuit with the entrance of oil extraction container 12;

As shown in Figure 2, described supercharging needle-valve 5 comprises swingle 15, pilot sleeve 16, spool, connecting bolt 20, locking nut 21, T-shaped sealing shelves post 22, black box 23, oil outlet 25, set screw nut 27, needle valve body 28, limited step 29, fuel-displaced limiting holes 34;

Described spool is one of the forming processing, comprises guide spiro rod 17, spline four directions 19, mitre velve point 24; The top of spool is guide spiro rod 17, and the intermediate portion of spool is spline four directions 19, and the bottom of spool is mitre velve point 24;

Swingle 15 is positioned at pilot sleeve 16, can rotate in pilot sleeve 16 and move up and down;

Guide spiro rod 17 is positioned at swingle 15, and the two is threaded connection;

Connecting bolt 20 top is provided with positioning table 26, spline four directions 19 is limited by positioning table 26, when swingle 15 is rotated, guide spiro rod 17 15 not to rotate in swingle, ensure that whole spool can only move up and down less displacement in the Vertical direction in spline four directions, positioning table 26 and pilot sleeve 16 are fixed by set screw nut 27;

Needle valve body 28 for being threaded the cuboid in hole, limited location step 29 in tapped hole; Connecting bolt 20 is fixed in the tapped hole of needle valve body 28 by locking nut 21;

Mitre velve point 24 is positioned at the tapped hole of needle valve body 28; The upper part of mitre velve point 24 is coated with T-shaped sealing shelves post 22, and the lower part of mitre velve point 24 is coated with black box 23; Black box 23 above undertaken spacing by T-shaped sealing shelves post 22, black box 23 carry out spacing below by limited step 29;

The side of needle valve body 28 is with oil outlet 25, and the surrounding of oil outlet 25 is what seal;

The opposite side of needle valve body 28 is filler opening 30, and the surrounding of filler opening 30 is what seal;

As shown in Figure 3, during the top of mitre velve point 24 relative to fuel-displaced limiting holes 34, fuel-displaced limiting holes 34 is full-gears; Fig. 3 (a) is fuel-displaced limiting holes 34 full-gear schematic diagram;

When mitre velve point 24 is positioned at the neutral position of fuel-displaced limiting holes 34, fuel-displaced limiting holes 34 is limited and makes oil condition; Fig. 3 (b) is that fuel-displaced limiting holes limits fuel-displaced view;

During the bottom of mitre velve point 24 relative to fuel-displaced limiting holes 34, fuel-displaced limiting holes 34 is full-shut positions, and Fig. 3 (c) is fuel-displaced limiting holes full off state schematic diagram.

The least significant end of the tapped hole of needle valve body 28 has fuel-displaced limiting holes 34.

The composition of described release needle-valve 11 is consistent with the composition of supercharging needle-valve 5.

The described major function be installed with for 1 of making is: for package unit provides initial pressure;

Described booster electric machine 2, the major function of unloading Medium-voltage Motor 8 are: be respectively two cover proportion adjustment parts and provide transmission;

The major function of described boost retarder 3, release retarder 9 is: reduce motor speed;

The major function of described supercharging coupling 4, release coupling 10 is: connection function, and upper end is connected with reducer output shaft, and lower end is connected with swingle;

The major function of described oil conservator 6 is: splendid attire fluid, pressure buffer;

Described oil circuit major function is: pressure transducer and needle-valve, make be installed with standby etc. between connect;

The major function of described oil extraction container 12 is: the fluid that splendid attire is discharged by release proportion adjustment part;

The major function of described pressure transducer 14 is: be used for measuring the pressure exported, and feedback signal;

The major function of described release needle-valve 11, supercharging needle-valve 5 is: rely on tapered valve point 24 moving up and down in fuel-displaced limiting holes 34 Vertical direction, regulate the fuel-displaced sectional area of fuel-displaced limiting holes 34, thus controls the fluid ratio of the system that enters and the system of discharge.

A kind of automatic ratio regulates the method for the fuel-displaced sectional area of fuel-displaced limiting holes:

To increase proportion adjustment part, the rotating speed of booster electric machine is R, and the reduction speed ratio of boost retarder is N:1, and after slowing down, the rotating speed that can obtain swingle is RN, and Speed unit is r/s; If the swingle minimum rotation time is t, the angle that therefore swingle rotates within the minimum rotation time is the pitch of driving screw is L, so the distance △ l that driving screw advances or retreats in swingle, namely spool follows the rotating speed of motor to have following relation in the displacement that fuel-displaced limiting holes Vertical Square moves up:

$\mathrm{\Δl}=\mathrm{tL}\frac{R}{N}---1$

Oil outlet sectional area is designed to S ₀, set the position of fuel-displaced limiting holes just standard-sized sheet as controlling initial position, the angle of design tapered valve point is θ, and when spool is at the displacement △ l that fuel-displaced limiting holes Vertical direction moves down, the fuel-displaced sectional area S of oil outlet and △ l exists following relation:

$S=S_0-\mathrm{\π}{\left[\mathrm{tg}\left(\frac{\mathrm{\θ}}{2}\right)\mathrm{\Δl}\right]}^2---2$

Now, just reach proportion adjustment and be installed with the standby object entering the fluid flow of oil vessel by making.

Based on the pressure regulating method of Automatic high pressure proportional controlling device, when current pressure is less than target pressure value, operating process is as follows:

Step 1.1: release electric machine rotation, makes release needle-valve be in closed condition, starts to make to be installed with to make pressure for for system, according to current pressure and goal pressure gap, booster electric machine rotates, and regulates the fuel-displaced sectional area of fuel-displaced limiting holes, determine the fluid ratio needing to enter oil vessel, pressure increases;

Step 1.2: Real-time Feedback current pressure, current pressure and goal pressure gap less time, correspondingly reduce fuel-displaced sectional area, Pressure rise rates slows down, until delivery pressure is goal pressure.

Current pressure is greater than target pressure value, and operating process is as follows:

Step 2.1: booster electric machine rotates, supercharging needle-valve is made to be in closed condition, measure current pressure, when finding larger with goal pressure gap, unload Medium-voltage Motor to rotate, regulate release needle-valve, make release needle-valve be in the working position of standard-sized sheet, fluid enters oil extraction container through release needle-valve from oil vessel, and system pressure reduces;

Step 2.2: Real-time Feedback current pressure, current pressure and goal pressure gap very little time, the corresponding fuel-displaced sectional area reducing release needle-valve, pressure reduce speed slow down, until delivery pressure is goal pressure.

Claims (2)

1. an Automatic high pressure proportional controlling device, comprises making and is installed with standby (1), supercharging ratio adjustment portion, oil conservator (6), release proportion adjustment part, oil extraction container (12), pressure transducer (14);

Described supercharging ratio adjustment portion, comprises booster electric machine (2), boost retarder (3), supercharging coupling (4), supercharging needle-valve (5);

Described release proportion adjustment part, comprises and unloads Medium-voltage Motor (8), release retarder (9), release coupling (10), release needle-valve (11);

Make to be installed with and be connected by oil circuit with the entrance of supercharging needle-valve (5) for (1), the outlet of supercharging needle-valve (5) is connected by oil circuit with the entrance of oil conservator (6), the outlet of oil conservator (6) is divided into three tunnels, wherein a road is connected by oil circuit with the entrance of release needle-valve (11), one tunnel is connected by oil circuit with pressure transducer (14), last road is exported (13) with test and is connected by pipeline, test outlet (13) and the autoclave appts Instrument connection be calibrated;

Booster electric machine (2), boost retarder (3), supercharging coupling (4) three coaxially connect, supercharging coupling (4) is connected with the swingle of supercharging needle-valve (5), supercharging coupling (4) and the synchronized rotation of swingle;

Unload Medium-voltage Motor (8), release retarder (9), release coupling (10) three coaxially connect, release coupling (10) is connected with the swingle of release needle-valve (11), release coupling (10) and the synchronized rotation of swingle;

The outlet of release needle-valve (11) is connected by oil circuit with the entrance of oil extraction container (12);

Described supercharging needle-valve (5) comprises swingle (15), pilot sleeve (16), spool, connecting bolt (20), locking nut (21), T-shaped sealing shelves post (22), black box (23), oil outlet (25), set screw nut (27), needle valve body (28), limited step (29), fuel-displaced limiting holes (34);

Described spool is one of the forming processing, comprises guide spiro rod (17), spline four directions (19), mitre velve point (24); The top of spool is guide spiro rod (17), and the intermediate portion of spool is spline four directions (19), and the bottom of spool is mitre velve point (24);

Swingle (15) is positioned at pilot sleeve (16), can rotate in pilot sleeve (16) and move up and down;

Guide spiro rod (17) is positioned at swingle (15), and the two is threaded connection;

Connecting bolt (20) top is provided with positioning table (26), spline four directions (19) limit by positioning table (26), when swingle (15) is rotated, guide spiro rod (17) does not rotate in swingle (15), and positioning table (26) and pilot sleeve (16) are fixed by set screw nut (27);

Needle valve body (28) for being threaded the cuboid in hole, limited location step (29) in tapped hole; Connecting bolt (20) is fixed in the tapped hole of needle valve body (28) by locking nut (21);

Mitre velve point (24) is positioned at the tapped hole of needle valve body (28); The upper part of mitre velve point (24) is coated with T-shaped sealing shelves post (22), and the lower part of mitre velve point (24) is coated with black box (23); Black box (23) above undertaken spacing by T-shaped sealing shelves post (22), black box (23) carry out spacing below by limited step (29);

The side of needle valve body (28) is with oil outlet (25), and the surrounding of oil outlet (25) is what seal;

The opposite side of needle valve body (28) is filler opening (30), and the surrounding of filler opening (30) is what seal;

The least significant end of the tapped hole of needle valve body (28) has fuel-displaced limiting holes (34);

The composition of described release needle-valve (11) is consistent with the composition of supercharging needle-valve (5).

2. the regulating method of a kind of Automatic high pressure proportional controlling device according to claim 1, is characterized in that: step is:

The rotating speed of booster electric machine is R, and the reduction speed ratio of boost retarder is N:1, and after slowing down, the rotating speed that can obtain swingle is R/N, and Speed unit is r/s; If the swingle minimum rotation time is t, the angle that therefore swingle rotates within the minimum rotation time is the pitch of guide spiro rod is L, so the distance, delta l that guide spiro rod advances or retreats in swingle, namely spool follows the rotating speed of motor to have following relation in the displacement that fuel-displaced limiting holes Vertical Square moves up:

$\mathrm{\Δl}=\mathrm{tL}\frac{R}{N}---\left(1\right)$

Fuel-displaced limiting holes sectional area is designed to S ₀, set the position of fuel-displaced limiting holes just standard-sized sheet as controlling initial position, the angle of design mitre velve point is θ, and when spool moves down displacement l in fuel-displaced limiting holes Vertical direction, the fuel-displaced sectional area S of fuel-displaced limiting holes and Δ l exists following relation:

$S=S_0-\mathrm{\π}{\left[\mathrm{tg}\left(\frac{\mathrm{\θ}}{2}\mathrm{\Δl}\right)\right]}^2---\left(2\right)$

Now, just reach proportion adjustment and be installed with the standby object entering the fluid flow of oil vessel by making;

Based on the pressure regulating method of Automatic high pressure proportional controlling device, when current pressure is less than target pressure value, operating process is as follows:

Step 1.1: release electric machine rotation, makes release needle-valve be in closed condition, starts to make to be installed with to make pressure for for system, according to current pressure and goal pressure gap, booster electric machine rotates, and regulates the fuel-displaced sectional area of fuel-displaced limiting holes, determine the fluid ratio needing to enter oil vessel, pressure increases;

Step 1.2: Real-time Feedback current pressure, current pressure and goal pressure gap less time, correspondingly reduce fuel-displaced sectional area, Pressure rise rates slows down, until delivery pressure is goal pressure;

Current pressure is greater than target pressure value, and operating process is as follows:

Step 2.1: booster electric machine rotates, supercharging needle-valve is made to be in closed condition, measure current pressure, when finding larger with goal pressure gap, unload Medium-voltage Motor to rotate, regulate release needle-valve, make release needle-valve be in the working position of standard-sized sheet, fluid enters oil extraction container through release needle-valve from oil vessel, and system pressure reduces;

Step 2.2: Real-time Feedback current pressure, current pressure and goal pressure gap very little time, the corresponding fuel-displaced sectional area reducing release needle-valve, pressure reduce speed slow down, until delivery pressure is goal pressure.