DE1428001A1 - Automatic control for hydraulically driven membrane compressors or pumps for very high pressure - Google Patents

Description

Dipl.-Ing. W. PAAP «| / j η « m « MÖNCHEN 22, d. _n ..J 5 ..... EehX! uar .... lSl63

pi.-ing. H. Mf TSCH E R L! CH flÜÜ, / ** »ί

^{r β} Taiefoits 29 66 84

ipl.-litg. K. GUKSCHMANN

PATENT AGENCIES! "All 31

Maschinenfabrik Burckhardt A.Gr.

Basel (Switzerland) Dornacherstraße 192 - -.

Patent application

Automatic control for hydraulically driven membrane compressors or pumps for very high pressure

Diaphragm compressors or diaphragm pumps are known which allow liquids or gases to be pumped without any contamination by smears and without leaks.

The invention aims to provide such compressors or pumps for use at extremely high pressures of to make several thousand atm usable.

Before explaining the essence of the invention, that becomes solving problem explained.

In Fig. 1 of the drawing, such a diaphragm compressor is in section shown. 1 designates the membrane, which on its outer circumference between the valve head 2 and the cylinder 3 is clamped. in the valve head 2 are holes 4 and 5 provided for suction and pressure valves, not shown.

The tree 6 above the membrane serves as a compression space, while the tree 7 of the membrane with a suitable liquid

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BATH ORIGINAL

is filled, which is displaced by the movement of the plunger 8 and thereby deflects the membrane. The plunger is sealed off from the outside by seals 9 and 10. the Displacement fluid in the seam Y is through the membrane I. completely separated from the delivery liquid xm hem €.

Plunger 8 is generally a normal one Crank drive moved back and forth «To realize the Invention, it is useful to him by a hydraulic Drive to move. This is done draroh a drive piston 11, by alternately filling the spaces above and below the drive piston with hydraulic fluid. The required for this Device is irrelevant to the invention and, since it is known per se, not shown in the drawing »You can for example consist of a control slide, which by known and customary means in the upper and lower end of the Hubes is reversed »

To explain the problems that one of the like machine occur, it is necessary to first consider the pressure changes that occur when operating such a machine !

The diagrams that appear are shown in Ug ₀ 2, where 12 means the lower end and 15 the upper end of the stroke of the plunger »The distance between lines 12 and 13 thus corresponds to the volume displaced by the plunger« »

The start of the pressure stroke is in the conveying space 6 and therefore also in the displacement space T the suction pressure 14 *

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BATH ORIGINAL

During the Druokhubes, the one in tree 6 is first Gas is compressed to pressure 15 and then through the pressure valve pushed out. It is now necessary, for various reasons, to increase the stroke volume of the plunger 8 to make than the stroke volume of the "diaphragm 6, which is only between the two arched boundary surfaces in the cylinder and can move in the valve head 2. That in displacement space 7 The displacement medium located is also compressible, the walls of the cylinder 3 expand under high pressure and sohliesslioh can not with a complete tightness of the Seal 9 can be expected. Since the stroke volume of the plunger 8 is greater than that to compensate for these influences Stroke volume of - "" embran 1, the diaphragm is attached to the upper Already create the boundary surface in the valve head 2 at point 16 before the end of the plunger stroke 13 is reached. Since the Plunger 8, on the other hand, wants to move on to the end of the stroke, there will now be an extraordinarily rapid increase in pressure in tree 7 enter.

During the compression stroke, the membrane 1 is not very heavily stressed because the pressures in the spaces 6 and 7 are practically the same «, However, after the membrane has attached itself to the has placed the upper surface area and after a If a very strong increase in pressure has occurred, the membrane can be endangered, as this increase in pressure tries to affect the membrane to drive into the openings of the suction and pressure channels and to a certain extent dance through BUS. The pressure increase must therefore be limited to a value which still applies to the J ^ embran

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If the breasts are well removed, atm. this is © device jeäooli niaht m hr If the Hasehin © with a lower Eniäruek 18 at lower Enüöruok "operated e _s it @ mbran already Frisier 's" B · Iu iunkt würäe request as "in oil © upper Begreiieungsflioli" koaaaeii _s because you Compressibility ä®3 oils »You. elaeti-Au8 \ since «ng ose cylinder» una oils Unitöhtigk «it ä © r 9 no * s © groBee £ © 11® spielia * lsi der wtiterea as» plunger »B wür & s then ^ i ^ t ^ iia sine very bridal« igerung follow ül® erat bteafiat "mirae ₉ f $ tm Üb'fs> AERU @ kvQntll, ^ Eloh" if ^one Uok on i®n Bs "infMttll / t ias üb $ rflustige Terir &^{Bguiagsmittel.?."} T & flituien can "Bi "Bruokdlffffsag!? R3.-ieoh" n & · η Drüeksa 17 uml 19 ^ "aa j" dooh easily several thousand atm "are> m £ 1st aaher for oils no longer permissible ·

Älänlioht Terhaltniss «t? Geb @ n see $ @ in the EU« kgmng dta Plunger «8, Das in the hilly Eftua above the Meabran tiBgeeelilosetas Gtas «ira aux-äohec? oa Bruftk l £ Ui a« f dan Battgdruek 20 · £ ρβηβleren, welohtr glettii 41 «Beginners is · When working «it is less than 19 years old

sun Itinkt Sl i * kei »Xa * etitn'fäUlen * tH el ** äas AneauitäruokY * iatil ^: « ff *** tt * i »tu 6 ü§rd« r ÄiKbran lurckßpfüiirt · Da Druokhub öfe ^ eii Unätelgkeit öar Paakuae 9 * t »* fc

9 ^ 9606/0111

has been lost by the displacement means, the membrane will come into contact wide at point 22 on the lower curved surface in cylinder 3, and as the plunger 8 continues downward, a rapid pressure drop will occur. If high suction pressures are used, as occurs in particular with so-called circulation pumps, the diaphragm can again be damaged by the pressure difference that occurs.

The invention has only the purpose of addressing these difficulties Avoid by creating ways and means to reduce the possible overpressures at the end of the pressure stroke and at the end of the Limit the suction stroke to a harmless level, whereby. this limitation automatically corresponds to the suction and Final pressures is adjusted.

The invention consists essentially in the fact that means are provided which are dependent on the exceeding of the operating ™ pressure End the pressure stroke in the compressor cylinder by a certain, harmless amount.

For this purpose, a device is proposed which registers the prevailing suction and end pressures and, as it were, retains the memory baw. Stored, xm they mm 'luböirrJs to compare with the occurring over "or underpressures. xma <d" .nn to initiate the necessary measures in order to reduce the pressure to the desired harmless measure xu ls ; icliränk * n.

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ORIGINAL BATHROOM

.6-1

Since the pressures in the compression room 6 ai are high, which is why they can only be measured with complicated and recommended devices, the propellant pressures under the piston 11 are instead measured according to the invention. These pressures are in relation to the cross-sectional area of the plunger 8 and of the piston 11, however, run exactly the same as the diagrams shown in FIG. 2.

In order to limit the overpressure at the end of the compression stroke, information is required according to the above about how big the 'blowing agent oil' is that the gas pressure 15 and 16 corresponds to »This is done by a controlled extraction valve, which during the short time

23 to 24 the measuring device with the cylinder interior in Connection brings »

In Fig. 1, this extraction valve is labeled 25, * "and a cam track 26 is controlled ₉ which is connected to the * piston rod ©. This cam track has a depression corresponding to" the distance 23 to 24 "and the extraction valve 25 opens as a result under the influence of the spring 27 when running Duroh these Streoke »

head it is nah. It is necessary to store this information about the level of normal pressure up to the end of the stroke · This is done in a hydraulic accumulator 28j which öursli ä ± & tessohrieMn © device exactly to. ^ aaigesa pressure filled up to the "eährsiiä d & r.Se & t 23 bia

24 is SfIiBG®i ^re geiierrgoiit hat ©

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During the downward movement of the piston, the extraction valve 25 is also opened when it traverses the distance 23 to 24 » During this time, however, a smaller one moves in the drive cylinder Pressure To prevent the accumulator 28 from being emptied, a gate valve 29 is provided, which releases the connection only during the upward stroke β β of the machine, during the downward stroke however, sioh spanking. The control of this gate valve 29 eats not shown in FIG. 1, since it is irrelevant to the invention. You can become dependent in a very simple way from the position of the control spool, which is also not shown

According to the above explanation of the principle of the invention, the stored information about the pressure must now be used to end the pressure stroke, with the membrane 1 resting against the upper boundary surface The pressure prevailing under the driving piston II is applied, on the other area of equal size 32, however, from the pressure prevailing in the peiofaer 26 and from a spring 33 As long as the HtM Diagram «runs between the sparks 1 $ and 16, it comes from both the area 31 the same pressure as on the surface 32, so that the piston must move to the left, drawn position under the action of the spring 39 a rapid pressure increase begins under the piston 11, which immediately acts on the fläohe 91 the control piston SO «The surface 32 is however still below the «in-

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U28001

effect of the stored pressure 28. As soon as the pressure increase from point 16 to 17 the force of leather 33 exceeds, as a result, the control piston 30 goes into the reohte end position «,

This movement of the control piston can be used to effect the reversal of the piston 11 and thus to end the Druokhub »The means required for this are known and irrelevant to the invention and are therefore not shown in Hg. The one also not shown Main control valve »that controls the oil distribution to the causes both sides of the piston 11 could e.g. duroh mechanical Medium or through a well-known hydraulic slave control? - or by a combination of electrical contacts and solenoid valves

It is readily understood that this device operates in exactly the same way when the final printout of the Machine is changed. -

If, for example, you are working with the final printout 18/19, this pressure is stored in memory 28 during the short withdrawal period 34/35. After the point 19 has been exceeded, the control slide 30 is again pushed into the right position by the overpressure that occurs. It is also evident that the overpressure 36 to 19 that occurs must be the same as the overpressure 17 to 16 that occurred earlier, namely again in accordance with the tension of the spring 35.During the selection of the tension of the spring 33 accordingly, this overpressure can easily be applied limit a value eu, which is harmless for the membrane »So dt · goal is, die

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ORIGINAL -

To protect the membrane against overload at the end of the pressure stroke, regardless of changing pressure levels, achieved »

Should it become necessary due to the great difference in the diagrams, the timing of the sampling period 23/24 or 34/35 (as shown in the diagram in a deliberately exaggerated manner), this can also be temporal Change can easily be achieved by turning the cam piece 26 can be moved relative to the piston rod.

in a similar way that securing the membrane against overload reached at the end of the suction stroke.

A further removal slide 36 is provided for this purpose, which is controlled in a similar way as before by a cam 37 and which is under the load of the spring 38 opens briefly to take a pressure test from the cylinder. This cam is arranged so that the removal of the Pressure test between points 39 and 40 takes place.

In a similar way as before, the pressure thus withdrawn is again stored in a memory 41. In a similar manner as before a closure slide 42 is provided, which opens the connection to memory 41 only when .Ansaugehub, _when: the pressure stroke, however, they absohliesst and can be controlled accordingly by means not shown · The Jierratohende in the accumulator 41 pressure acts on a multiplier whose grp, sser _v , piston, 43 and, small piston 44 in. similar. . _r ratio., Jiie is the largest piston 11 and the. Plunger, £ j_ :. , ...,.

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H28001

Since the pressure on the large piston 43 is counteracted by the force of the spring 45, the pressure generated by the small coil 44 will be slightly lower than the suction pressure 22 of the machine _{: 5>} .,

As soon as at point 22 the membrane 1 is on the lower boundary surface applies, the pressure of the displacement begins. means to sink rapidly »As soon as this pressure has dropped to level 46, the pressure is above the spring-loaded packing lower than the pressure below. The pack 9 will therefore lift SiQh from its base and will be from the Multiplier 44 pumped propellants enter the cylinder permit. The pressure in the cylinder can therefore not fall below the pressure 46.

As can be seen from the above, the amount of pressure difference from 22 to 46 depends on the strength of the spring 45 away. By appropriately dimensioning this spring it is therefore possible to keep the pressure difference 22 to 46 as small as possible ensure that the membrane is not endangered.

The multiplier 44 is not required during the print stroke. Therefore, the connection between the piston 43 of the multiplier and the memory 41 are interrupted during the pressure stroke by a slide 47, which instead creates a connection to the open air. ”Under the action of spring 45, piston 43 will therefore recede, and so will the multiplier can be filled fresh again. The slide 47 can easily be controlled so that it is during the suction stroke the connection to the accumulator 41 »during the Druokhubes die

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Connection ine free represents. The means to control this to bring about are known and irrelevant for the invention, which is why they are not shown in Fig. 1 * This control can e.g. be accompanied in a simple way by the movement of the main valve, which distributes the oil to both sides of the Piston 11 regulates

Anaprüohe t

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Claims (1)

f 1 i Automatic control for hydraulically driven © membrane compressors or pumps down for very high. Pressure, characterized in that means are provided which, depending on the exceeding of the operating pressure ± m compressor cylinder by a certain, harmless amount, end the Brtaek stroke, 2, control of claim 1, characterized in that means are provided _ä »which depends on the excess of the operating pressure * in the driving cylinder by a certain, the harmless level. End print stroke. 3 »Control according to claims 1 and 2, characterized in that that means are provided to the respective driving pressure to be recorded at a certain point and to be saved for comparison with the maximum pressure h » Control according to Claims 1 to 3, characterized in that after the diaphragm has been placed at the end of the Sfcughubea oil under one Pressure is refilled, which the suction pressure of the compressor »by one falls below a certain level 5 * Control according to claims 1 to k, characterized in that means are provided to extract and store uk the pressure Iu drive cylinder at a certain point during the suction tube β su 6. Control according to claims 1 to 5 »thereby marked» «rejects, that the pressure la memory through a multiplier 909806 / 0ia2 - 13 - with the same piston ratio as the piston ratio of the compressor itself is increased _o 7 Automatic control according to claims 1 to 6, daduroh marked that the withdrawal point during the Druokhubes is adjustable » By patent attorney 909806/0182