CN101116905A - Differential pressure control valve and antigravity casting pressure control method using said valve - Google Patents
Differential pressure control valve and antigravity casting pressure control method using said valve Download PDFInfo
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- CN101116905A CN101116905A CNA2006101044178A CN200610104417A CN101116905A CN 101116905 A CN101116905 A CN 101116905A CN A2006101044178 A CNA2006101044178 A CN A2006101044178A CN 200610104417 A CN200610104417 A CN 200610104417A CN 101116905 A CN101116905 A CN 101116905A
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Abstract
The invention is a pressure difference control valve and a pressure control method of antigravity cast using the differential pressure controlling valve. A threshold regulator of the pressure difference control valve (28) applies pretightening force on one end of a spring (5) through a regulating handle (1) to realize a regulable opening threshold of a preinstall valve. According to the bias between the detected pressure difference and the preset threshold, a pressure difference comparator automatically realizes the control of opening of valve through a diaphragm (9), therefore realizing the effective control of the flow and pressure difference of fluid. The pressure difference control valve (28) and a main pressure control valve (27) are both used in the pressure control system of the antigravity casting machine. The effective control of pressure difference is realized through comparing the pressure difference between the upper and lower press rooms (21, 17) of the antigravity casting host machine with the preset threshold. The invention can distinctly reduce the complexity of the gas circuit and the difficulty of implementation of control, effectively simplify the air circuit and control the differential pressure between upper and lower press rooms of the antigravity cast in an appropriate range. The invention has the characteristics of low running cost, a simple structure and high reliability.
Description
One, technical field
The invention belongs to the fluid pressure regulator valve field, is a kind of differential pressure control valve and the antigravity casting compress control method that uses this valve.
Two, background technology
Diaphragm control valve is a valve mechanism commonly used in a kind of fluid flow and the pressure control.In existing control valve, use a diaphragm or piston structure to accept the control end applied pressure usually, and under pressure control, drive the action of spool in valve body, realize the switching of valve and and then realize the control of valve opening.A kind of compression casting diaphragm valve as patent document ZL02274971.3 proposes comes from the control signal of closed loop feedback system and and then realizes that the spool action that moves up and down and drive of diaphragm obtains different valve openings by acceptance.This diaphragm valve is applied in a plurality of industries, and its shortcoming need to be a closed loop feedback system to its input pressure signal, thereby is difficult to directly realize the feedback and the control of pressure reduction, also is difficult to directly realize the default of valve opening threshold pressure differential.
When using existing control valve to carry out pressure or flow-control,, thereby can only realize the control of single channel pressure or flow usually because it only accepts the input action of one road pressure.For some use occasion that need between two fluid circuits, control certain pressure reduction, then need to use the prime sensing device that pressure reduction numerical value is detected, and then adjust the input pressure of control valve, control different control valve openings, function realizes comparatively complicated.
A kind of automatic regulating valve that utilizes patent document ZL01807958.X to be proposed, can pass through the break-make of the also big or small and then by-pass valve control of judgement two-way pressure, but this valve only is the size of comparison two-way pressure but not the numerical value of pressure reduction, be difficult to realize the adjustment of valve opening pressure reduction, use this valve can not realize high-precision flow-control simultaneously.
Use Differential Pressure Controller also can realize the control of pressure reduction, but the adjustment inconvenience of pressure difference, simultaneously Differential Pressure Controller is used for the less demanding and response speed of accuracy occasion faster more, for the tangible occasion of controlled device response lag and be not suitable for.
As declare a kind of antigravity casting control pressurer system that file 200410029119.8 is addressed for national defence patent, need in control, realize pressing down on the antigravity casting machine control of chamber pressure and set up a certain size pressure reduction betwixt, under controlled pressure reduction condition, finish and fill type and solidify to drive molten metal.In the process of pressure reduction control, press down being controlled in certain limit value that the pressure reduction of chamber can be stable in the requirement, the constant pressure difference is excessive causes casting mold to destroy or fill the type failure thereby avoid pressing down.In this example, use existing diaphragm control valve can cause the gas circuit complex structure, realize that as having used four control valves in the prior art two are pressed the pressure of chamber to control also and then realize certain pressure reduction, the control difficulty is bigger, when system's control characteristic is bad, tangible over control may occur, thereby cause pressure reduction to transfinite and cause the accident.And use existing differential pressure control valve to be difficult to realize that pressure reduction is regulated easily, casting simultaneously presses chamber pressure that the obvious hysteresis of gas circuit pressure is made that also existing differential pressure control valve is difficult to use.
Three, summary of the invention
At existing diaphragm control valve only can by detect single channel pressure and and then control single channel flow or pressure, be difficult to directly realize the problem of adjustable pressure reduction control simultaneously, the present invention proposes a kind of differential pressure control valve and the using method in the control of antigravity casting pressure thereof.
Pressure reduction control device among the present invention comprises threshold pressure differential adjuster, pressure reduction comparator and control valve.The threshold pressure differential adjuster is made of regulating handle and spring, by regulating handle spring one end is applied pretightning force, to realize adjustable default valve opening threshold value.The pressure reduction comparator is the cavity housing that is made of upper film chamber's lid, diaphragm and lower film chamber cover, and diaphragm is positioned in the middle of the film chamber, and its outside is fixed together with upper film chamber's lid and lower film chamber cover, forms two cavitys of isolating mutually of upper film chamber and following film chamber; On upper film chamber's lid and the lower film chamber cover pressure tap is arranged; There is stem through-hole at the center of diaphragm.Pressure-difference valve is made of valve rod, valve gap, valve body, spool, and the spool of del is lifted on the termination of valve rod, places valve gap and valve inner, and the diaphragm that passes in the pressure reduction comparator is connected with the spring other end; Fixedly connected with diaphragm when valve rod penetrates the diaphragm central through hole simultaneously, guarantee the sealing between upper film chamber and the following film chamber simultaneously.
Among the present invention, the motion of spool is driven jointly by pressure reduction and the initial tension of spring that diaphragm receives in the control valve: when presetting the valve opening threshold value by pressure reduction Fujian value adjuster, make valve rod produce downward power, if this moment, diaphragm chamber did not have pressure reduction, then diaphragm produces distortion and moves downward under the drive of valve rod, and the spool that is positioned at the valve rod termination is moved downward, with the valve body sealing, make control valve enter closed condition; When if the pressure difference of upper film chamber and following film chamber is enough to offset the active force of spring, differential pressure control valve enters opening, simultaneously can be according to the deviation size control of realization valve opening automatically that records between pressure reduction and the predetermined threshold value, the aperture of valve depends on the elastic modelling quantity of the size of deviation and spring, diaphragm structure, thereby realizes effective control of fluid flow and pressure reduction.
In the present invention, a kind of antigravity casting compress control method that uses above-mentioned differential pressure control valve has also been proposed.The device connected mode that realizes this control method is: the pressure main control valve is connected in high pressure gas holder and main frame presses down between the chamber, differential pressure control valve is connected on high pressure gas holder and the main frame presses between the chamber, and with on the antigravity casting main frame, press down the chamber by pipeline respectively with differential pressure control valve on, following pressure tap connects, press down the pressure of chamber by pressure main control valve control antigravity casting main frame, detect the pressure reduction that antigravity casting main frame two is pressed between the chamber by above-mentioned differential pressure control valve, press the constant pressure differences and the comparative result control gas of setting threshold to enter the flow of another pressure chamber according to two, with on press down the chamber pressure reduction be controlled within the suitable scope.
Concrete control procedure is:
At first,, fill type, compression solidification, removal pressure four processes design antigravity casting pressure control aim curve by decompression operation, differential pressure with reference to the form of accompanying drawing 3 according to casting dimension, alloy species and the requirement of filling the type process of setting;
The unlatching threshold value of differential pressure controller is arranged on the maximum differential pressure of being controlled, promptly when on when pressing down the constant pressure difference less than required maximum differential pressure, differential pressure control valve is closed, when on when pressing down the constant pressure difference more than or equal to required maximum differential pressure, differential pressure control valve is opened; The pressure of lower pressure tanks is arranged on is lower than default level of pressing the chamber minimum pressure, the pressure of high pressure gas holder is arranged on is higher than default level of pressing the chamber maximum pressure;
In the decompression operation stage, the closing presure main control valve, open the intercommunication valve, on press the chamber air bleeding valve and press down the chamber air bleeding valve, press the chamber pressure chamber minimum pressure extremely default on the removal with the pressure that presses down the chamber, pressing down chamber pressure during this period equates with last pressure chamber pressure, differential pressure control valve is closed, on the chamber of pressing down finish decompression operation synchronously;
Fill the type stage in differential pressure, close the intercommunication valve and last pressure chamber presses down the chamber air bleeding valve, open the pressure main control valve gases at high pressure importing is pressed down the chamber, make press down that chamber pressure rises and last press down to form between the chamber fill type pressure reduction, the difference that presses down chamber pressure and last pressure chamber pressure during this period is less than the maximum differential pressure of being controlled, differential pressure control valve is closed, on press chamber pressure to remain unchanged;
Fill the type stage in differential pressure, continue to close the intercommunication valve and last pressure chamber presses down the chamber air bleeding valve, open the pressure main control valve gases at high pressure importing is pressed down the chamber, make and press down chamber pressure and rise to the pressure chamber maximum pressure of setting and keep: if on press down the constant pressure difference and raise, when its during greater than the maximum differential pressure controlled, differential pressure control valve is opened, and gas enters presses the chamber to make its pressure rising, makes to press down the constant pressure difference and reduce; When on when pressing down the constant pressure difference less than the maximum differential pressure controlled, differential pressure control valve is closed, and makes to press down the constant pressure difference and increase; In the process of differential pressure control valve action, can on press down the constant pressure difference and maintain the level that approaches the maximum differential pressure of controlling;
In the removal pressure stage, the closing presure main control valve is opened the intercommunication valve and last pressure chamber presses down the chamber air bleeding valve, with on press down the synchronous removal of indoor gas to lower pressure tanks, make its pressure be reduced to normal pressure; Press down the constant pressure difference during this period less than the maximum differential pressure of being controlled, thus differential pressure control valve close, on the chamber of pressing down finish synchronously and unload press operation.
Use the adjustable differential pressure control valve of unlatching threshold value provided by the invention can adjust the valve opening threshold value easily, and close automatically or open according to magnitude of pressure differential between a position and another position and the deviation of setting threshold pressure differential, and can realize effective control of pressure reduction according to the aperture of amount of deflection by-pass valve control.When being applied to this differential pressure control valve in the antigravity control pressurer system, can significantly reduce the complexity of gas circuit and the enforcement difficulty of control, can effectively simplify gas circuit, be controlled within the suitable scope pressing down the constant pressure difference on the antigravity casting, it is low to have operating cost, simple in structure, reliable high characteristics.
Four, description of drawings:
Accompanying drawing 1 is the structural representation of differential pressure control valve;
Accompanying drawing 2 is the antigravity casting pressure control device structure charts with above-mentioned differential pressure control valve door;
Accompanying drawing 3 is pressue-graphs that the antigravity casting pressure control device need be realized.
Wherein:
1. regulating handle 2. is regulated screw 3. adjusting screw(rod)s 4. top tray 5. springs
6. play on the pallet 7. pressure tap 8. upper film chamber to cover 9. diaphragms, 10. lower film chamber covers
11. following pressure tap 12. supporters 13. valve rods 14. valve gaps 15. valve bodies
16. spool 17. presses down chamber 18. crucibles, 19. stalks, 20. casting molds
21. press chamber air bleeding valve 25. to press down the chamber air bleeding valve on 22. lower pressure tanks, 23. Pressure gauges 24. of last pressure chamber
26. intercommunication valve 27. pressure main control valves 28. differential pressure control valves 29. Pressure gauges 30. high pressure gas holders
Five, the specific embodiment:
Describe the invention process process below with reference to accompanying drawings in detail.
Embodiment one
Present embodiment is a kind of adjustable differential pressure control valve of threshold value of opening, and comprises threshold pressure differential adjuster, pressure reduction comparator, control valve.
The threshold pressure differential adjuster comprises regulating handle 1, adjusting screw(rod) 3, spring 5, spring tray 4 and 6, supporter 12.Supporter 12 is a frame structure, and framework upper has the screw 2 of adjusting, and adjusting screw(rod) 3 passes this screw, and two ends are connected with spring top tray 4 with regulating handle 1 respectively.
The diaphragm chamber of pressure reduction comparator comprises upper film chamber's lid 8, lower film chamber cover 10 and diaphragm 9, the cavity housing that constitutes by upper film chamber's lid, diaphragm and lower film chamber cover, diaphragm is positioned in the middle of the film chamber, its outside fastens between upper film chamber's lid and following film chamber by bolt clip, and the upper film chamber and the following film chamber of airtight formation sealing; On upper film chamber's lid and the lower film chamber cover pressure tap is arranged; There is stem through-hole at the center of diaphragm.
Pressure-difference valve is made of valve rod 13, valve gap 14, valve body 15 and spool 16, and valve body is divided into valve chamber and lower valve chamber, and there is dividing plate the centre, and this dividing plate centre has the cross section to be down trapezoidal perforate; Valve rod 13 runs through valve body 15 and film chamber, and an end is connected with pallet 6 under the spring, and the other end is positioned at valve body; The trapezoidal spool that falls is lifted on the termination of valve rod, and its profile is consistent with dividing plate perforate profile, but tight closure between the two.
The mounting means of present embodiment is as follows: spool 16 is connected with valve rod 13 by screw thread, places in the valve body 15, cover valve gap 14 and with bolted, with its assemblage gap of washer sealing; On valve gap 14, supporter 12 is installed with bolt, falling film chamber cover 10 is installed on the supporter 12 with bolt, valve rod 13 enters the film chamber via the through hole on supporter 12 and the lower film chamber cover 10, and fixes to clamp the realization interlock by screw thread on nut and the valve rod and diaphragm 9; Valve rod 13 stretches out the film chamber via upper film chamber's lid 8; Upper film chamber's lid 8, diaphragm 9, lower film chamber cover 10 are by the film chamber of bolt in the fastening and airtight formation sealing of edge; Valve rod 13 upper ends are fastening by pallet 6 under screw thread and the reed, connect spring 5 under the reed on the pallet 6, and spring 5 upper ends are connected with the reed top tray; Screw in adjusting screw(rod) 3 at supporter screw socket 2 places, adjusting screw(rod) 3 lower ends are fastening by screw thread and reed top tray 4, and adjusting screw(rod) 3 upper ends are fastening by screw thread and regulating handle 1; Cover 8 positions of fitting with packing seal at valve rod 13 with valve gap 14, lower film chamber cover 10, upper film chamber, prevent that fluid from leaking; Valve opening corresponding on the profile of spool 16 and the valve body 15 is in full accord, and spool 16 leaks with the valve body 15 closely knit fluids that prevent when guaranteeing valve closing.
For describing the manner of execution of valve, the fluid pressure that last pressure measurement mouth 7 places are recorded is designated as P1, also is the pressure value that diaphragm upper surface bears; The fluid pressure that following pressure measurement mouth 11 places record is designated as P2, also is the pressure value that the diaphragm lower surface bears.
When spring 5 was in compressive state, note spring preload pressure was F, and the spring modulus is k, and diaphragm area is A, and said apparatus operating principle in use is:
When P1＞P2-F/A, valve rod 13 does not promote under the effect of the pressure reduction of film chamber 810 up and down and spring 5 pressure, and spool 16 keeps sealing states with valve body 15, and fluid can not pass through valve flow;
When P1≤P2-F/A, valve rod 13 overcomes spring 5 under the differential pressure action of film chamber 810 up and down pressure moves upward, the slit appears between spool 16 and the valve body 15, fluid begins to pass through valve flow, the height h of spool 16 rises simultaneously is relevant with the deviation size of actual pressure differential and setting pressure reduction, its expression formula is h=(P2-P1) * A/k-F/k, thereby realizes different valve openings, realizes different fluid flows.
The unlatching threshold value of said apparatus is given by the ratio of preload pressure F and diaphragm area A, and the pressure reduction response characteristic then ratio with diaphragm area A and spring modulus k is relevant.
Equally, when spring 5 was in extended state, note spring prefastening force was F, and the spring modulus is k, and diaphragm area is A, and said apparatus operating principle in use is:
When P1＞P2+F/A, valve rod 13 does not promote under the effect of the pressure reduction of film chamber 810 up and down and spring 5 pressure, and spool 16 keeps sealing states with valve body 15, and fluid can not pass through valve flow;
When P1≤P2+F/A, valve rod 13 overcomes spring 5 under the differential pressure action of film chamber 810 up and down pulling force moves upward, the slit appears between spool 16 and the valve body 15, fluid begins to pass through valve flow, the height h of spool 16 rises simultaneously is relevant with the deviation size of actual pressure differential and setting pressure reduction, its expression formula is h=(P2-P1) * A/k+F/k, thereby realizes different valve openings.
The unlatching threshold value of said apparatus is given by the ratio of prefastening force F and diaphragm area A, and the pressure reduction response characteristic then ratio with diaphragm area A and spring modulus k is relevant.
Embodiment two
Present embodiment is a kind of antigravity casting compress control method based on embodiment one described differential pressure control valve 28.Differential pressure control valve 28 is applied to the antigravity casting control device, and this device also comprises pressure chamber 21, presses down chamber 17, crucible 18, casting mold 20, stalk 19; Control pressurer system comprise lower pressure tanks 22, high pressure gas holder 30, pressure main control valve 27, differential pressure control valve 28, on press chamber air bleeding valve 24, press down chamber air bleeding valve 25, intercommunication valve 26, Pressure gauge 23 and 29.
The connected mode of antigravity casting control device is: on press chamber 21 and press down between the chamber 17 and separate with dividing plate, form the space of sealing respectively; The crucible 18 that fills molten metal placed press down chamber 17, with casting mold 20 place on the dividing plate, on press within the chamber 21, the stalk 19 lower ends molten metal that submerges, the upper end is passed dividing plate and is docked with casting mold 20 cast gates; Press down chamber 17 and be connected with an end that presses down chamber air bleeding valve 25 with pressure main control valve 27 respectively, press down chamber 17 simultaneously and also be connected with an end of intercommunication valve 26; Last pressure chamber 21 is connected with the end of differential pressure control valve 28 with last pressure chamber air bleeding valve 24 respectively, goes up simultaneously and presses chamber 21 also to be connected with the other end of intercommunication valve 26; The other end of pressure main control valve 27 and pressure reduction main control valve 28 all is connected with the outlet of high pressure gas holder 30, on press chamber air bleeding valve 24 all to be connected with the outlet of lower pressure tanks 22 with the other end that presses down chamber air bleeding valve 25; Insert the following pressure measurement end that presses down chamber pressure table 29 and differential pressure control valve 28 respectively via the pressure dispatch tube by pressing down the gas pressure of obtaining chamber 17; The gas pressure of being obtained by last pressure chamber 21 inserts the last pressure measurement end of pressing chamber pressure table 23 and differential pressure control valve 28 respectively via the pressure dispatch tube.
Present embodiment need be realized the pressure control aim curve shown in accompanying drawing three, and P1 is for pressing down chamber pressure, and P2 is last pressure chamber pressure, Δ P be required realization on to press down constant pressure poor.Main function is, at first t1 in the time will on press down chamber pressure and be reduced to the p5 under the low pressure condition synchronously and remain to time t2, with gas and the moisture in abundant removal molten metal and the casting mold, set up pressure reduction p3 between the chamber and drive molten metal and rise along stalk and enter casting mold and finish and fill type last pressing down in time t2～t3 interval, then rapidly on the chamber of pressing down pressurize synchronously, make and press down chamber pressure and be elevated to p1 in time t3～t4 interval, press down simultaneously between the chamber and to keep the pressure reduction p3 and the time t5 of being maintained to that molten metal is under stress finished solidifying, press down chamber pressure to normal pressure on reducing at last, so that take out foundry goods.
As seen following relation is arranged between the force value among the figure:
p4-p5＝p1-p2＝p3
In the present embodiment, antigravity casting compress control method based on differential pressure control valve is, by the control of pressure main control valve press down the chamber pressure, go up the pressure of pressing the chamber by using differential pressure control valve according to default threshold pressure differential control, thereby the pressure reduction between the two-way fluid is controlled at proper level, realizes the control of liquid metal filling and compression solidification.
For finishing above-mentioned control method, at first the unlatching threshold value of differential pressure controller 28 is arranged on the maximum p3 of Δ P, promptly when P1-P2＜p3, differential pressure control valve is closed, and when P1-P2 〉=p3, differential pressure control valve is opened; The pressure of lower pressure tanks 22 is arranged on the level that is lower than p5, the pressure of high pressure gas holder 30 is arranged on the level that is higher than p1.
At time interval 0～t2, closing presure main control valve 27, open intercommunication valve 26 and on press down chamber air bleeding valve 23,24, will on press down the synchronous removal of chamber pressure to lower pressure tanks 22, make P1, P2 be reduced to p5 and be maintained to time t2, press down chamber pressure P1 during this period and equate with last pressure chamber pressure P2, thus differential pressure control valve 28 close, on the chamber of pressing down finish decompression operation synchronously.
At time interval t2～t3, close intercommunication valve 26 and on press down chamber air bleeding valve 23,24, open pressure main control valve 27 and the gas in the high pressure gas holder 30 is imported press down chamber 17, make to press down chamber pressure P1 and rise to p4 along curve.The difference that presses down chamber pressure P1 and last pressure chamber pressure P2 during this period is less than p3, the gas pressure that acts on the diaphragm upper and lower surface is not enough to offset the pressure of spring 5, and valve rod 13 does not promote, and spool 16 keeps sealing state with valve body 15, so differential pressure control valve 28 closes, on press chamber pressure to remain unchanged.
At time interval t3～t5, continue to close intercommunication valve 26 and on press down chamber air bleeding valve 23,24, open pressure main control valve 27 and the gas in the high pressure gas holder 30 is imported press down chamber 17, make to press down chamber pressure P1 and rise to p1 and keep along curve.During this period, if pressing down the difference of chamber pressure P1 and last pressure chamber pressure P2 raises, when its during greater than p3, the gas pressure that acts on the diaphragm upper and lower surface is enough to offset the pressure of spring 5, valve rod 13 promotes, and the slit occurs between spool 16 and the valve body 15, and differential pressure control valve 28 is opened, last pressure chamber 21 air inlet P2 raise, and the difference that presses down chamber pressure P1 and last pressure chamber pressure P2 is reduced; When the difference that presses down chamber pressure P1 and last pressure chamber pressure P2 during less than p3, the gas pressure that acts on the diaphragm upper and lower surface is not enough to offset the pressure of spring 5, valve rod 13 does not promote, spool 16 keeps sealing state with valve body 15, so differential pressure control valve 28 is closed, the difference that presses down chamber pressure P1 and last pressure chamber pressure P2 is increased; In the process of differential pressure control valve 28 action, can on press down the constant pressure difference and maintain the level that approaches p3.
At time interval t5～t6, closing presure main control valve 27, open intercommunication valve 26 and on press down chamber air bleeding valve 23,24, will on press down the synchronous removal of chamber pressure to lower pressure tanks 22, make P1, P2 be reduced to 0.The difference that presses down chamber pressure P1 and last pressure chamber pressure P2 during this period is less than p3, thus differential pressure control valve 28 close, on the chamber of pressing down finish synchronously and unload press operation.
Claims (4)
1. a differential pressure control valve comprises threshold pressure differential adjuster, pressure reduction comparator and control valve, it is characterized in that:
A. the threshold pressure differential adjuster is made of regulating handle (1), adjusting screw(rod) (3), supporter (12) and spring (5), regulating handle (1) is fixedlyed connected with adjusting screw(rod) (3), adjusting screw(rod) (3) is connected with supporter (12) by regulating screw (2), adjusting screw(rod) (3) other end is connected with spring (5), and supporter (12) is fixedlyed connected with regulation valve body (15) with pressure reduction comparator shell;
B. the pressure reduction comparator is made of upper film chamber lid (8), diaphragm (9), lower film chamber cover (10), on upper film chamber's lid (8) and the lower film chamber cover (10) pressure tap (7), (11) is arranged respectively, and there is stem through-hole at upper film chamber's lid (8) and lower film chamber cover (10) center; Diaphragm (9) outer is separately fixed between upper film chamber's lid (8) and the lower film chamber cover (10); There is stem through-hole at the diaphragm center, and diaphragm (9) is fixedlyed connected with valve rod (13);
C. control valve is made of valve rod (13), valve gap (14), valve body (15), spool (16), valve rod (13) passes the film chamber of upper film chamber's lid (8) and lower film chamber cover (10) formation, one end is connected with spring (5), and other end lifting spool (16) places in the valve body (15).
2. differential pressure control valve according to claim 1, its feature also is the position packing seal that valve rod (13) and upper film chamber lid (8), lower film chamber cover (10), valve gap (14) combine.
3. antigravity casting control device with the described control valve of claim 1, comprise and press chamber (21), press down chamber (17), crucible (18), casting mold (20), stalk (19), gas tank (22,30), pressure main control valve (27), differential pressure control valve (28), last pressure chamber air bleeding valve (24), press down chamber air bleeding valve (25), intercommunication valve (26), Pressure gauge (23,29), it is characterized in that the pressure main control valve is connected in high pressure gas holder and main frame presses down between the chamber, differential pressure control valve is connected on high pressure gas holder and the main frame presses between the chamber, and with on the antigravity casting main frame, press down the chamber by pipeline respectively with differential pressure control valve on, following pressure tap connects.
4. one kind based on claim 1 and 3 described antigravity casting compress control methods, it is characterized in that working pressure main control valve (27) control antigravity casting main frame presses down the pressure of chamber, use differential pressure control valve (28) to detect to press chamber (21) on the antigravity casting main frame and press down the pressure reduction between the chamber (17), press the comparative result control gas of constant pressure difference and setting threshold to enter the flow that another presses the chamber according to two, with on press down the chamber pressure reduction be controlled within the suitable scope, concrete control procedure is:
According to casting dimension, alloy species and the requirement design antigravity casting pressure control aim curve that fills the type process of setting;
The unlatching threshold value of differential pressure controller is arranged on the maximum differential pressure of being controlled; The pressure of lower pressure tanks is arranged on is lower than default level of pressing the chamber minimum pressure, the pressure of high pressure gas holder is arranged on is higher than default level of pressing the chamber maximum pressure;
The closing presure main control valve, open the intercommunication valve, on press the chamber air bleeding valve and press down the chamber air bleeding valve, the pressure of pressing the chamber on the removal and pressing down the chamber is to preset pressure, on the chamber of pressing down finish decompression operation synchronously;
Close the intercommunication valve and last pressure chamber presses down the chamber air bleeding valve, open the pressure main control valve and gases at high pressure are imported press down the chamber, make press down that chamber pressure rises and last press down to form between the chamber fill type pressure reduction;
Continue to close the intercommunication valve and last pressure chamber presses down the chamber air bleeding valve, open the pressure main control valve gases at high pressure importing is pressed down the chamber, make to press down chamber pressure and rise to setting pressure and keep, differential pressure control valve according on press down the constant pressure difference and open or close, with on press down the level that the constant pressure difference maintains setting;
The closing presure main control valve is opened the intercommunication valve and last pressure chamber presses down the chamber air bleeding valve, with on press down the synchronous removal of indoor gas to lower pressure tanks, make its pressure be reduced to normal pressure.
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| EP0911714A1 (en) * | 1997-10-20 | 1999-04-28 | Electrowatt Technology Innovation AG | Flow control valve with integrated pressure controller |
| US6354319B1 (en) * | 2000-04-13 | 2002-03-12 | Dresser, Inc. | Low differential, pilot operated fluid pressure regulation apparatus and method |
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| CN104863696A (en) * | 2014-02-26 | 2015-08-26 | 爱三工业株式会社 | Supercharging Apparatus For Engine |
| WO2017139678A1 (en) * | 2016-02-12 | 2017-08-17 | Nitto Denko Corporation | Pressure sensitive graphene-based valve element |
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| CN113333715A (en) * | 2021-05-28 | 2021-09-03 | 重庆长安汽车股份有限公司 | Low-pressure casting mold-filling pressure curve design method based on back pressure |
| CN113333715B (en) * | 2021-05-28 | 2022-11-04 | 重庆长安汽车股份有限公司 | Low-pressure casting mold-filling pressure curve design method based on back pressure |
| CN114061307A (en) * | 2021-11-29 | 2022-02-18 | 沈阳真空技术研究所有限公司 | Cold crucible antigravity precision casting equipment |
| CN114061307B (en) * | 2021-11-29 | 2022-07-01 | 沈阳真空技术研究所有限公司 | Cold crucible antigravity precision casting equipment |
| CN116379363A (en) * | 2023-04-10 | 2023-07-04 | 广州研测安全技术有限公司 | Remote valve closing device for gas leakage alarm |
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| CN101116905B (en) | 2010-05-12 |
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