CA1104380A - Diaphragm of elastic material and arrangement using the same - Google Patents
Diaphragm of elastic material and arrangement using the sameInfo
- Publication number
- CA1104380A CA1104380A CA326,953A CA326953A CA1104380A CA 1104380 A CA1104380 A CA 1104380A CA 326953 A CA326953 A CA 326953A CA 1104380 A CA1104380 A CA 1104380A
- Authority
- CA
- Canada
- Prior art keywords
- diaphragm
- convex
- concave
- central
- flange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2261—Shaping or arrangements of the sealing the sealing being arranged on the valve member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J3/00—Diaphragms; Bellows; Bellows pistons
- F16J3/02—Diaphragms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
- F16K7/14—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat
- F16K7/16—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat the diaphragm being mechanically actuated, e.g. by screw-spindle or cam
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reciprocating Pumps (AREA)
- Diaphragms And Bellows (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Sealing Devices (AREA)
- Safety Valves (AREA)
Abstract
Abstract of the Disclosure:
The diaphragm of a flexible elastic material has a rotary symmetrical configuration defining a peripheral flange adapted for being fixed to a housing in an at-tachment plane, an annular marginal region adjoining the flange and a central region, the marginal region forming an annular vault increasing progressively in thickness in the direction from the flange toward the central region so that the latter forms a concave bulge which is mov-able between two limit positions along the axis of sym-metry of the diaphragm.
The diaphragm of a flexible elastic material has a rotary symmetrical configuration defining a peripheral flange adapted for being fixed to a housing in an at-tachment plane, an annular marginal region adjoining the flange and a central region, the marginal region forming an annular vault increasing progressively in thickness in the direction from the flange toward the central region so that the latter forms a concave bulge which is mov-able between two limit positions along the axis of sym-metry of the diaphragm.
Description
11043~0 USING THE SAME
Background of the Invention:
This invention relates generally to elastic diaphragms and more particularly it relates to a shaped diaphragm of elastic or flexible metal material and to its arrange-ment and application in different devices.
Conventional diaphragms of this type have different shapes and fields of applications. In operation, the known diaphragms are subject to excessive changes in shape and consequently are prone to premature wear and damage.
Summary of the Invention:
.
It is, therefore, a general object of the present invention to overcome the aforementioned disadvantages.
.
More particularly, it is an object of this invention to provide a diaphragm of the above-described type which is suitable for opening or closing hydraulic circuits or for various controlling applications, for condensing fluid materials~ and for lifting or compressing objects, and which has a uniform basic form.
~ 1104380 1 A further object of this invention is to provide such an improved diaphragm which can be manufactured of different elastic materials such as, for example, of natural or synthetic rubber, elastic plastic material or of a flexible metal.
. Another object of this invention is to provide a diaphragm which in any of its operative posltions exhib-its minimum volumetric changes and is exposed exclusively to compressive tensions.
An additional object of the invention is to provide such an impr~ved diaphragm having a thickness which is adjustable to any pressure conditions and which has, therefore, an increased internal rigidity so that it seals without the aid of additional structural elements.
In keeping with these objects, and others which will become apparent hereafter, one feature of the invention resides, in a diaphragm of an elastic material, in the provision of a rotary symmetrical diaphragm body which is shaped to form a peripheral flange arranged in an at-tachment plane, an annular conve~ vault extending between the flange and a concave central region of the diaphragm, the thickness of the vault-shaped portion of the diaphragm body increasing from the flange toward the central por-tion, the central portion being movable between two limit . .
1104~38~
1 positions and the space between the vault-shaped portion and the attachment ~lane having a substantially uniform cross-section in any position of the central portion.
The diaphragm characterized by the aforementioned S features finds many applications. For example, it can be employed as a stabilizer for lifting, stamping or compressing devices. It is also applicable as a diaphragm in a control drive or as a diaphragm in a shut-off or check valve where it can be operated either mechanically or hy-draulically. Finally, the diaphragm of this invention is also applicable as a shut-off flap.
Another advantage of the diaphragm of this invention is in the fact that it is operable from either side and two opposite parts of the concave central region can be employed as sealing surfaces. In another application, the outer marginal portion of the diaphragm can be used as the sealing surface. Furthermore, it is also pos-sible to use on diaphragm of this invention to act as a control diaphragm for adtuating another diaphragm connect-ed thereto and employed as a sealing diaphragm.
The diaphragm of the invention has basically the shape of a semispherical shell with an inwardly depressed apex portion. This configuration has an additional ad-vantage in that it permits to make the diaphragm of great . 11~4380 1 variety of elastic materials such as an elastomer or plastic, that means not only of materials which have rubber~like qualities but also of elastically bendable metal alloys. The reason for such an extended application is the fact that during the movement of the diaphragm there results only minute changes in shape. Consequently, it is sufficient to move the diaphragm with a relatively small stroke to obtain a sufficient throughflow cross-section when applied, for example, in a ~alve.
The novel features which are considered as character-istic for the invention are sçt forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specif-ic embodiments when read in connection with the accompany--ing drawings.
. Brief Description of the Drawin~s:
Figs. la-lc is an axial section of the diaphragm of this invention shown in different working positions;
Fig. 2 is an axial section of the diaphragm of Fiq. 1 shown in a reversed positlon;
Fig. 3 is a sectional view of a lifting cushion using two juxtaposed diaphragms of this invention;
11(~4;~
1 Fig. 4 is an axial section of a thrust drive using the diaphragm of this invention;
Fig. 5 is a sectional view of a gate valve using the diaphragm of this invention;
Fig. 6 is a sectional view of another gate valve in combination with a control device using diaphragms of this invention;
Fig. 7 shows in a sectional view a housing of a gate valve using the diaphragm of this invention;
Fig. 8 is a cross-sectional view of another embodi-ment of a gate valve using an obliquely arranged dia-phragm of this invention as a shutting element;
Fig. 9 is still another embodiment of the gate valve using the diaphragm of this invention;
Fig. 10 shows in a sectional view a non-return valve using the diaphragm of this invention;
Fig. 11 shows a sectional view of a diaphrag~ pump of this invention;
Fig. 12 is a sectional view of a sealing flap using the diaphragm of this invention as a sealing element; and Fig. 13 is a modification of a sealing flap of Fig~
12.
Description of the Preferred Embodiments:
Figs. la-lc show respectively an axial section of a .
~ 3 ~ 0 1 diaphragm 10 made o elastomer or of an elastic plastic material or also of a flexible metal, in a rest position, in an intermediate actuated position and in a limit ac-tuated position. The shape of the diaphragm 10 as shown in its rest position corresponds to the shape of its man-ufacturing or vulcanization mold;
The diaphragm 10 has a shaped rotation s~vmmetrical ~ody provided on its circumference with a flange 12 de-fining a clamping or attachment plane 12a. In the fol-lowing description, the surface of the diaphragm facing the attachment plane 12a will be designated as the inner side 11, whereas the opposite surface is designated as the outer side 13 of the diaphragm. As shown in Figs.
la-lc, the diaph~agm body 10 is shaped such as to form at its marginal portion adjoining the clamping flange 12 an annular vault defined by the outwardly curved margin-al annulus 15r and 14r bounded by the inner side 11 and the outer side 13. The radius of curvature of the inner i marginal side portion 15 is smaller than the radius of curvature of the outer marginal side portion 14, so tha~
the thickness of the diaphragm body 10 uniformly increases I from the flange 12 toward the central region M of the diaphragm. As seen from Figs. la-lc the diaphragm 10 undergoes during the displacement of its bulged central portion M from its normal position to its limit position 110~:38~
1 only a minute change and particularly any s~eezing and rolling motions thereof are eliminated. The Figures also make evident the fact that despite of minute deformation of the diaphragm a relatively large stroke of the latter can be achieved.
The convex curves l5L and 15R (relative to the at-tachment plane 12 and the annular space R~ transit in the central area M into a concave hulge which at the lower side 11 of the diaphragm has a base of a diameter X.
Similarly, the curved marginal portion 14L and 14R on the upper side 13 of the diaphragm 10 transit in the cen-tral region M of the upper side into a concave depression 17 having a base of the diameter Y. Accordingly, the marginal part Z is convex, whereas the central part Y is concave.
As indicated by dot lines, the outline of the convex annular part 14L and 14R intersect at an acute angle in a center point MC on the center axis of the diaphragm body. In the cross-section, the area between the outer marginal surface portion 14 and the inner marginal surface portion 15 of the a-nular wall has the configuration of a helical section. As a consequence, the convex marginal portions 14 and lS of the diaphragm body has in its rest position the shape of a substantially circular section, whereby by displacing the bulging central portion M towards 1~4L38(1 1 its limit position the circular section in the proximity of the flange 12 changes its shape only negligibly. Thls configuration of the diaphragm which corresponds to an ideal form of a surface acted upon by a pressure both from above as well as from helow is made possible by the great-er elasticity of the outer range.
The intersection point MC in the center of the di-aphragm is in the normal position according to Fig. 1 about 2/3 of its maximum stroke above the upper clamping plane of the flange 12, whereas in the limit working po-sition as shown in Fig. lc the point MC is about 1/3 of the stroke below this plane. From the intermediate po-sition as shown in Fig. lb the center of the membrane moves about 2/3 of the stroke upwardly and 1/3 of the stroke downwardly.
As seen from Fig. 1, the central portion of the outer side 13 of the diaphragm has a smaller concave region Y than the central convex region X at the lower side 11 of the diaphragm. Both central regions Y and X are also smaller in diameter than the width of the annular region Z. It can also be seen from the drawings that more than 70 to 90~ of the upper side 13 of the diaphragm has the CQnVeX vault. The reverse relation is on the inner side 11 of the diaphragm where the convex surface 15 is 110~3RU
substantially larger than the central region Y having a concave configuration.
The diaphragm 10, as seen from Fig. 1, does not have any rigid central region. Conventional diaphragms of this type have a distinct rigid center area, and conse-quently the central region cannot participate in the var-iation of form defining the stroke of the diaphragm. The changes of the form of such prior-art diaphragms take place exclusively in the smaller annular marginal part of the diaphragm body. In the diaphragm according to this in-vention, the entire circular surface Fl of the diaphragm body is its working surface. .In other words, each change of the working position of the diaphragm results in a simultaneous change of the form of the entire diaphragm body. The largest stroke is made by the central point MC
of the diaphragm body, whereas toward the periphery the stroke continuously decreases. The shape of the diaphragm of this invention enables, therefore, a large stroke of the : center region of the diaphragm whereby the change of the 20 , annular volume below the lateral vaulted region is rela-tively small. This particular feature of the diaphragm i according to this invention enables many-sided applica-tions.
As seen from Fig. 2, the convex section 14 of the 11~ 80 l outer side of the diaphragm body extends over a radius R
of more than 90, whereas the concave central region re-versely bulged into the form of a semispherical shell has in the center of the diaphragm a radius R2 of less than 90. Figs. l and 2 further illustrate that the ratio of the diameter D of the diaphragm body to its height H is larger than 2.5 and smaller than 3.5.
The diaphragm of Fig. 2 has an inwardly projecting flange 18 provided if desired with a reinforcement or armoring l9 and with a smaller outwardly projecting flange 20. The arcuate or vaulted walls 14 and 15 start at the flange 12.
Fig. 3 illustrates the arrangement of two diaphragms 10 having juxtaposed inner sides. The flanges of the both 151 diaphragms are clamped between a correspondingly shaped ring 21 and outer tubular clamps 22 and 23 which hold the whole unit together. The space between the two diaphragms is filled with a pressure medium through the filling port 24. The arrangement according to Fig. 3 can be used, for example, for lifting an object 25 supported on the upper diaphragm lO or for damping its vibrations. The lower diaphragm is supported on a cup-shaped support 26 attached by means of a flat iron plate 27 to a foundation 28.
-11- _ ll~ V
1 Fig. 4 shows an application of the diaphragm of this invention in an adjustable drive. In this embodiment, the bulging center portion at the inner side of the diaphragm is extended to form a reinforcement 29 having an elliptical cross-section, the periphery 30 of which lies below the attachment flange 12. The surface of the elliptical re-inforcement 29 transits into the convex vault of the in-ner surface in a streamlined fashion so that the periphery 30 projects into the annular space R below the convex marg-inal part of the diaphragm. A disk-shaped head 31 of a metal rod 32 is emhedded in the elliptical central rein-forcement 29 of the diaphragm. The clamping of the attach-ment flange 12 is effected by means of clamping rims of two housing parts 33 and 34. The diaphragm separates two pressure chambers 35 and 36 in the housing and drives al-ternately a pressure medium admitted through ports 37 and 38. Fig. 5 shows a gate valve including the diaphragm 10 of this invention in which the outer convex surface portions 14R and 14L intersect at a center point MC. The ; 20 downwardly bulging central reinforcement 29 at the inner side of the diaphragm acts as a shutting member which in this embodiment, extends obliquely to the attachment plane of the flange 12 and is provided with a metal reinforcement 31 embedded therein. The outer side has at the central region a concave surface 17 si~ilarly as in the preceding embodiment. The clamping flange 12 is clamped between a - 11~80 1 lower housing part 39 and an upper housing part 40, the latter containing a control device for the valve. The two housing parts are screwed one to another and the fluid flows through the main line in the valve in the direction of arrow 41. A control liquid 43 is provided between the upper side of the diaphragm and the inner wall 42 of the upper housing part 40. A hand wheel 44 with a threaded spindle 45 engaging a threaded hole in . the lid of the upper housing part 40 controls the movement of plunger 46 projecting into the interspace filled with the control liquid 43 and being sealed against leakage by sealing rings 47, 48 and 49.
. When the plunger 46 is moved downwardly, it exerts a pressure against the liquid 43 which acts against the entire upper surface of the diaphragm 10 and forces the same downwardly. As soon as the pressure acting on the upper surface of the diaphragm via the plunger and the liquid 43 exceeds the counterpressure of the medium flow-ing through the main line in the lower housing part, the vaulted part at the lower surface of the diaphragm closes .
the seat 61. When the plunger 17 is moved by the hand wheel 44 upwardly, the pressure of the streaming medium :
acting against the lower surface of the diaphragm 10 exceeds the pressure of the control liquid 43 and the . .
11~38~
1 bulging central part of the diaphraym is automatically liftcd from the seat 61 and opens the passage. Due to the fact that the diaphragm can be exposed to hydraulic pressure on both sides thereof, the closing and opening position of the valve can be very simply adjusted, The diaphragm of this invention is applicable for pressures up to 25 bars.
The diaphragms 10 and lOa used in the valve accord-ing to Fig. 6 are provided similarly as the diaphragm in Fig. 2 with pins 50 embedded in the bulging central part thereof and projecting in the dîrection of the axis of symmetry of each diaphragm beyond the clamping plane of the flange 12. Instead of the pin which is provided with outer threads 51 there can be used a sleeve embedded in the bulging central part of the diaphragm and provided with inner threads. This sleeve, similarly as in the example of Fig. 2, can be embedded in the diaphragm by means of a reinforcing head 52. The convex central section 16 of the inner side of the diaphragm cooperates with a 2Q matching abutment piece 53 one face of which is provided with a complementary concave or cup-shaped recess in con-tact with the diaphragm section 16. The radius of curva-ture of the concave recess on the abutment piece 53 is slightly larger than the radius of curvature of the convex bulging central portion of the diaphragm. This difference ~..,._ ~
., 11~ 0 1 in size contributes to a reduced friction since upon com-pressing the diaphragm the concave vault of its central section 16 becomes somewhat flattened. A connecting shaft 55 rests on the flat side of the a~utment piece 53 and is screwed to the central pin 52 of the diaphragm. The shaft 55 connects the shutting diaphragm 10 to the con-trol diaphragm lOa of a control device. The control di-aphragm lOa is arranged in the same manner as the shutting diaphragm 10 in the lower housing part 39 but is slightly larger in diameter. The control diaphragm lOa is clamped between the upper housing part 56 and a cover 57 by means of a ring 58. The pin 50a of the control diaphragm lOa is screwed to the other end of the connecting shaft 55 and cooperates with similar abutment piece 53a. The upper side 13a of the control diaphragm lOa is exposed to a pressure of a control fluid fed through an intake port 69 in the cover 57. Another pressure fluid is introduced into the space between the inner wall of the housing part 56 and the inner surface of the control diaphragm lOa to regulate the compression of the control diaphragm.
Fig. 7 shows a valve having a housing 39 covered with a cover 40 fastened to the housing 39 by screws. The surface of cover 40 facing the diaphragm is shaped simi-larly as the abu~nent piece 53 in Fig~ 6 to have a concave recess 54. The diaphragm is controlled by a pressure . _ ~_ _~
~ 80 1 ¦ fluid such as a pressure air or pressure water intro-¦ duced against the upper surface of the diaphragm through ¦ the intake port 59 and the diaphragm is inverted to close ¦ the central passage in the housing 39.
¦ In the valve as illustrated in Fig. 8, the diaphragm ¦ according to Fig. 2 is arranged obliquely to the axis of ¦ the main passage o~ the valve housing 39 and moves per-¦ pendicularly to an oblique valve seat 61. In this ar-¦ rangement, the diaphragm abuts against the valve seat 61 ¦ along the apex line 62 of the outer convex marginal por-¦ tion 14 acting as the sealing surface, This apex line ¦ can be reinforced by pro~ections 63. The diaphragm is ¦ moved by means of a hand wheel 44 and a threaded spindle ¦ 45 which at its free lcwer end has a threaded boring 64 ¦ engaging the thread of the pin 50 embedded in the diaphragm I
¦ Fig. 9 il~ustrates a valve having the diaphragm 10 i ¦ arranged in a valve housing 65 made of a teflon block which ¦ is shaped, for example, by mechanical machining. This teflon block is surrounded by two metallic half shells ' 20 I connected one to another by bolts 66 and 67. The abutment ¦ piece 53 cooperating with the bulging central portion of ¦ the diaphragm is also assembled of two halves screwed together by bolts 68 and 68a. The apex of its bulging central part on the inner side 13 has an extension 69 11(?~
1 ¦ provided with an undercut 70. A connection pin 71 is em-¦ bedded in the extension 69 and is connected to a spindle ¦ 72. In addition, the abutment piece 53 engages the under-¦ cut 70 so as to insure a reliable connection of the con-¦ trol spindle 72 to the diaphragm. The adjustment of the¦ working position of the diaphragm is carried out by means ¦ of the hand-operated wheel 44.
¦ Fig. 10 illustrates the diaphragm 10 used as the shutting element of a non-return valve having a housing 39 defining a main passage with an obliquely arranged seat similarly as the valves in Fig. 8. The vaulted lat-eral walls of the diaphragm are provided with juxtaposed openings 73 and 14. The sealing contact line of the diaphragm of Fig. 10 is similar to the apex sealing line as described in connection with Fig. 8. A reinforcing disk 31 is embedded in the bulging central portion of the diaphragm. This reinforcing member may have a star-like configuration projecting with its tips into the vaulted portion of the diaphragm body.
Fig. 11 shows a diaphragm pump in which the Clange of the diaphragm is clamped between the lower housing part 39 and the upper housing part 40. The flange 12 is sur-¦ rounded by tching recesses in the housing part, whereas .
I
11~
1 the bulging central pa~t projects into the interior of the upper housing part 40 and is provided with an embedded threaded pin passing through the recessed abutment member and threaded to a fork 75 provided with a pivot pin 76.
The pin 76 supports a crank lever 77 linked at the other end to an eccentric pivot pin 78 on a driving wheel 79.
The intake of the fluid takes place at the intake port . of a non-return valve in a direction indicated by arrow 80, whereas the discharge of the fluid is affected through another non-return valve in the ~irection of arrow 81.
The passage between the two non-return valves communicates with the variable space between the bottom of the housing part 39 and the lower side of the diaphragm 10. The di-aphragm pump can handle relatively large pressures such as, for example, 10 bars.
.
Fig. 12 shows the application of the diaphragm of this invention as a sealing element of a shut-off flap 82 supported in a housing 84 eccentrically by a rotary shaft 83. Due to this eccentric arrangement the shut-off . 20 flap defines a continuous sealing surface along its whole periphery and reliably seals in both directions of flow.
For this purpose the flap 82 is provided along its peri-phery with a groove 85 into which the flange 18 of the diaphragm 10 snugly fits, whereby the outer periphery 20 of the flan acts as a sealing surface. The bulging -~8-- ~ . .
1~4~8~) central portion of the diaphragm is connected to the center of the disk-shaped shut-off flap 82 by the connect-ing pin 50.
Fig. 13 shows a modification of a shut~off flap in which the shut-off disk 82 has an increased diameter with respect to the disk of Fig. 12 and the diaphragm lOa of this invention has a ring-shaped configuration with an opening in its center and is secured to the marginal sec-tion of the disk 82 to perform merely its sealing func-tion. In the reinforced inner margin of the diaphragm lOa there are embedded connecting pins 50 and 50a similar to the pin 50 in Fig. 12 and are secured by nuts 86 and 86a to the disk 82. As long as no pressure fluid is sup-plied into the main conduit, the outer rim 20 of the diaphragm is only as a loose contact with the inclined sur-face of the valve seat 81 and the flap can be easily op-erated. If a pressure fluid is admitted into a conduit in the direction of arrows 8~, the outer rim 20 sealingly engages the surface 88.
20 ¦ It will be understood that each of the elements de-scribed above, or two or more together, may also find a useful application in other types of constructions differ-ing from the types described above.
.
1~ 80 1 While the invention has been illustrated and described a~ embodied in a diaphragm, it is not intended to be lim-ited to the details shown, since various modifications and structural changes may be made without departing in S any way from the spirit of the present invention. .
Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can . by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential char-acteristics of the generic or specific aspects of this invention.
What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims.
Background of the Invention:
This invention relates generally to elastic diaphragms and more particularly it relates to a shaped diaphragm of elastic or flexible metal material and to its arrange-ment and application in different devices.
Conventional diaphragms of this type have different shapes and fields of applications. In operation, the known diaphragms are subject to excessive changes in shape and consequently are prone to premature wear and damage.
Summary of the Invention:
.
It is, therefore, a general object of the present invention to overcome the aforementioned disadvantages.
.
More particularly, it is an object of this invention to provide a diaphragm of the above-described type which is suitable for opening or closing hydraulic circuits or for various controlling applications, for condensing fluid materials~ and for lifting or compressing objects, and which has a uniform basic form.
~ 1104380 1 A further object of this invention is to provide such an improved diaphragm which can be manufactured of different elastic materials such as, for example, of natural or synthetic rubber, elastic plastic material or of a flexible metal.
. Another object of this invention is to provide a diaphragm which in any of its operative posltions exhib-its minimum volumetric changes and is exposed exclusively to compressive tensions.
An additional object of the invention is to provide such an impr~ved diaphragm having a thickness which is adjustable to any pressure conditions and which has, therefore, an increased internal rigidity so that it seals without the aid of additional structural elements.
In keeping with these objects, and others which will become apparent hereafter, one feature of the invention resides, in a diaphragm of an elastic material, in the provision of a rotary symmetrical diaphragm body which is shaped to form a peripheral flange arranged in an at-tachment plane, an annular conve~ vault extending between the flange and a concave central region of the diaphragm, the thickness of the vault-shaped portion of the diaphragm body increasing from the flange toward the central por-tion, the central portion being movable between two limit . .
1104~38~
1 positions and the space between the vault-shaped portion and the attachment ~lane having a substantially uniform cross-section in any position of the central portion.
The diaphragm characterized by the aforementioned S features finds many applications. For example, it can be employed as a stabilizer for lifting, stamping or compressing devices. It is also applicable as a diaphragm in a control drive or as a diaphragm in a shut-off or check valve where it can be operated either mechanically or hy-draulically. Finally, the diaphragm of this invention is also applicable as a shut-off flap.
Another advantage of the diaphragm of this invention is in the fact that it is operable from either side and two opposite parts of the concave central region can be employed as sealing surfaces. In another application, the outer marginal portion of the diaphragm can be used as the sealing surface. Furthermore, it is also pos-sible to use on diaphragm of this invention to act as a control diaphragm for adtuating another diaphragm connect-ed thereto and employed as a sealing diaphragm.
The diaphragm of the invention has basically the shape of a semispherical shell with an inwardly depressed apex portion. This configuration has an additional ad-vantage in that it permits to make the diaphragm of great . 11~4380 1 variety of elastic materials such as an elastomer or plastic, that means not only of materials which have rubber~like qualities but also of elastically bendable metal alloys. The reason for such an extended application is the fact that during the movement of the diaphragm there results only minute changes in shape. Consequently, it is sufficient to move the diaphragm with a relatively small stroke to obtain a sufficient throughflow cross-section when applied, for example, in a ~alve.
The novel features which are considered as character-istic for the invention are sçt forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specif-ic embodiments when read in connection with the accompany--ing drawings.
. Brief Description of the Drawin~s:
Figs. la-lc is an axial section of the diaphragm of this invention shown in different working positions;
Fig. 2 is an axial section of the diaphragm of Fiq. 1 shown in a reversed positlon;
Fig. 3 is a sectional view of a lifting cushion using two juxtaposed diaphragms of this invention;
11(~4;~
1 Fig. 4 is an axial section of a thrust drive using the diaphragm of this invention;
Fig. 5 is a sectional view of a gate valve using the diaphragm of this invention;
Fig. 6 is a sectional view of another gate valve in combination with a control device using diaphragms of this invention;
Fig. 7 shows in a sectional view a housing of a gate valve using the diaphragm of this invention;
Fig. 8 is a cross-sectional view of another embodi-ment of a gate valve using an obliquely arranged dia-phragm of this invention as a shutting element;
Fig. 9 is still another embodiment of the gate valve using the diaphragm of this invention;
Fig. 10 shows in a sectional view a non-return valve using the diaphragm of this invention;
Fig. 11 shows a sectional view of a diaphrag~ pump of this invention;
Fig. 12 is a sectional view of a sealing flap using the diaphragm of this invention as a sealing element; and Fig. 13 is a modification of a sealing flap of Fig~
12.
Description of the Preferred Embodiments:
Figs. la-lc show respectively an axial section of a .
~ 3 ~ 0 1 diaphragm 10 made o elastomer or of an elastic plastic material or also of a flexible metal, in a rest position, in an intermediate actuated position and in a limit ac-tuated position. The shape of the diaphragm 10 as shown in its rest position corresponds to the shape of its man-ufacturing or vulcanization mold;
The diaphragm 10 has a shaped rotation s~vmmetrical ~ody provided on its circumference with a flange 12 de-fining a clamping or attachment plane 12a. In the fol-lowing description, the surface of the diaphragm facing the attachment plane 12a will be designated as the inner side 11, whereas the opposite surface is designated as the outer side 13 of the diaphragm. As shown in Figs.
la-lc, the diaph~agm body 10 is shaped such as to form at its marginal portion adjoining the clamping flange 12 an annular vault defined by the outwardly curved margin-al annulus 15r and 14r bounded by the inner side 11 and the outer side 13. The radius of curvature of the inner i marginal side portion 15 is smaller than the radius of curvature of the outer marginal side portion 14, so tha~
the thickness of the diaphragm body 10 uniformly increases I from the flange 12 toward the central region M of the diaphragm. As seen from Figs. la-lc the diaphragm 10 undergoes during the displacement of its bulged central portion M from its normal position to its limit position 110~:38~
1 only a minute change and particularly any s~eezing and rolling motions thereof are eliminated. The Figures also make evident the fact that despite of minute deformation of the diaphragm a relatively large stroke of the latter can be achieved.
The convex curves l5L and 15R (relative to the at-tachment plane 12 and the annular space R~ transit in the central area M into a concave hulge which at the lower side 11 of the diaphragm has a base of a diameter X.
Similarly, the curved marginal portion 14L and 14R on the upper side 13 of the diaphragm 10 transit in the cen-tral region M of the upper side into a concave depression 17 having a base of the diameter Y. Accordingly, the marginal part Z is convex, whereas the central part Y is concave.
As indicated by dot lines, the outline of the convex annular part 14L and 14R intersect at an acute angle in a center point MC on the center axis of the diaphragm body. In the cross-section, the area between the outer marginal surface portion 14 and the inner marginal surface portion 15 of the a-nular wall has the configuration of a helical section. As a consequence, the convex marginal portions 14 and lS of the diaphragm body has in its rest position the shape of a substantially circular section, whereby by displacing the bulging central portion M towards 1~4L38(1 1 its limit position the circular section in the proximity of the flange 12 changes its shape only negligibly. Thls configuration of the diaphragm which corresponds to an ideal form of a surface acted upon by a pressure both from above as well as from helow is made possible by the great-er elasticity of the outer range.
The intersection point MC in the center of the di-aphragm is in the normal position according to Fig. 1 about 2/3 of its maximum stroke above the upper clamping plane of the flange 12, whereas in the limit working po-sition as shown in Fig. lc the point MC is about 1/3 of the stroke below this plane. From the intermediate po-sition as shown in Fig. lb the center of the membrane moves about 2/3 of the stroke upwardly and 1/3 of the stroke downwardly.
As seen from Fig. 1, the central portion of the outer side 13 of the diaphragm has a smaller concave region Y than the central convex region X at the lower side 11 of the diaphragm. Both central regions Y and X are also smaller in diameter than the width of the annular region Z. It can also be seen from the drawings that more than 70 to 90~ of the upper side 13 of the diaphragm has the CQnVeX vault. The reverse relation is on the inner side 11 of the diaphragm where the convex surface 15 is 110~3RU
substantially larger than the central region Y having a concave configuration.
The diaphragm 10, as seen from Fig. 1, does not have any rigid central region. Conventional diaphragms of this type have a distinct rigid center area, and conse-quently the central region cannot participate in the var-iation of form defining the stroke of the diaphragm. The changes of the form of such prior-art diaphragms take place exclusively in the smaller annular marginal part of the diaphragm body. In the diaphragm according to this in-vention, the entire circular surface Fl of the diaphragm body is its working surface. .In other words, each change of the working position of the diaphragm results in a simultaneous change of the form of the entire diaphragm body. The largest stroke is made by the central point MC
of the diaphragm body, whereas toward the periphery the stroke continuously decreases. The shape of the diaphragm of this invention enables, therefore, a large stroke of the : center region of the diaphragm whereby the change of the 20 , annular volume below the lateral vaulted region is rela-tively small. This particular feature of the diaphragm i according to this invention enables many-sided applica-tions.
As seen from Fig. 2, the convex section 14 of the 11~ 80 l outer side of the diaphragm body extends over a radius R
of more than 90, whereas the concave central region re-versely bulged into the form of a semispherical shell has in the center of the diaphragm a radius R2 of less than 90. Figs. l and 2 further illustrate that the ratio of the diameter D of the diaphragm body to its height H is larger than 2.5 and smaller than 3.5.
The diaphragm of Fig. 2 has an inwardly projecting flange 18 provided if desired with a reinforcement or armoring l9 and with a smaller outwardly projecting flange 20. The arcuate or vaulted walls 14 and 15 start at the flange 12.
Fig. 3 illustrates the arrangement of two diaphragms 10 having juxtaposed inner sides. The flanges of the both 151 diaphragms are clamped between a correspondingly shaped ring 21 and outer tubular clamps 22 and 23 which hold the whole unit together. The space between the two diaphragms is filled with a pressure medium through the filling port 24. The arrangement according to Fig. 3 can be used, for example, for lifting an object 25 supported on the upper diaphragm lO or for damping its vibrations. The lower diaphragm is supported on a cup-shaped support 26 attached by means of a flat iron plate 27 to a foundation 28.
-11- _ ll~ V
1 Fig. 4 shows an application of the diaphragm of this invention in an adjustable drive. In this embodiment, the bulging center portion at the inner side of the diaphragm is extended to form a reinforcement 29 having an elliptical cross-section, the periphery 30 of which lies below the attachment flange 12. The surface of the elliptical re-inforcement 29 transits into the convex vault of the in-ner surface in a streamlined fashion so that the periphery 30 projects into the annular space R below the convex marg-inal part of the diaphragm. A disk-shaped head 31 of a metal rod 32 is emhedded in the elliptical central rein-forcement 29 of the diaphragm. The clamping of the attach-ment flange 12 is effected by means of clamping rims of two housing parts 33 and 34. The diaphragm separates two pressure chambers 35 and 36 in the housing and drives al-ternately a pressure medium admitted through ports 37 and 38. Fig. 5 shows a gate valve including the diaphragm 10 of this invention in which the outer convex surface portions 14R and 14L intersect at a center point MC. The ; 20 downwardly bulging central reinforcement 29 at the inner side of the diaphragm acts as a shutting member which in this embodiment, extends obliquely to the attachment plane of the flange 12 and is provided with a metal reinforcement 31 embedded therein. The outer side has at the central region a concave surface 17 si~ilarly as in the preceding embodiment. The clamping flange 12 is clamped between a - 11~80 1 lower housing part 39 and an upper housing part 40, the latter containing a control device for the valve. The two housing parts are screwed one to another and the fluid flows through the main line in the valve in the direction of arrow 41. A control liquid 43 is provided between the upper side of the diaphragm and the inner wall 42 of the upper housing part 40. A hand wheel 44 with a threaded spindle 45 engaging a threaded hole in . the lid of the upper housing part 40 controls the movement of plunger 46 projecting into the interspace filled with the control liquid 43 and being sealed against leakage by sealing rings 47, 48 and 49.
. When the plunger 46 is moved downwardly, it exerts a pressure against the liquid 43 which acts against the entire upper surface of the diaphragm 10 and forces the same downwardly. As soon as the pressure acting on the upper surface of the diaphragm via the plunger and the liquid 43 exceeds the counterpressure of the medium flow-ing through the main line in the lower housing part, the vaulted part at the lower surface of the diaphragm closes .
the seat 61. When the plunger 17 is moved by the hand wheel 44 upwardly, the pressure of the streaming medium :
acting against the lower surface of the diaphragm 10 exceeds the pressure of the control liquid 43 and the . .
11~38~
1 bulging central part of the diaphraym is automatically liftcd from the seat 61 and opens the passage. Due to the fact that the diaphragm can be exposed to hydraulic pressure on both sides thereof, the closing and opening position of the valve can be very simply adjusted, The diaphragm of this invention is applicable for pressures up to 25 bars.
The diaphragms 10 and lOa used in the valve accord-ing to Fig. 6 are provided similarly as the diaphragm in Fig. 2 with pins 50 embedded in the bulging central part thereof and projecting in the dîrection of the axis of symmetry of each diaphragm beyond the clamping plane of the flange 12. Instead of the pin which is provided with outer threads 51 there can be used a sleeve embedded in the bulging central part of the diaphragm and provided with inner threads. This sleeve, similarly as in the example of Fig. 2, can be embedded in the diaphragm by means of a reinforcing head 52. The convex central section 16 of the inner side of the diaphragm cooperates with a 2Q matching abutment piece 53 one face of which is provided with a complementary concave or cup-shaped recess in con-tact with the diaphragm section 16. The radius of curva-ture of the concave recess on the abutment piece 53 is slightly larger than the radius of curvature of the convex bulging central portion of the diaphragm. This difference ~..,._ ~
., 11~ 0 1 in size contributes to a reduced friction since upon com-pressing the diaphragm the concave vault of its central section 16 becomes somewhat flattened. A connecting shaft 55 rests on the flat side of the a~utment piece 53 and is screwed to the central pin 52 of the diaphragm. The shaft 55 connects the shutting diaphragm 10 to the con-trol diaphragm lOa of a control device. The control di-aphragm lOa is arranged in the same manner as the shutting diaphragm 10 in the lower housing part 39 but is slightly larger in diameter. The control diaphragm lOa is clamped between the upper housing part 56 and a cover 57 by means of a ring 58. The pin 50a of the control diaphragm lOa is screwed to the other end of the connecting shaft 55 and cooperates with similar abutment piece 53a. The upper side 13a of the control diaphragm lOa is exposed to a pressure of a control fluid fed through an intake port 69 in the cover 57. Another pressure fluid is introduced into the space between the inner wall of the housing part 56 and the inner surface of the control diaphragm lOa to regulate the compression of the control diaphragm.
Fig. 7 shows a valve having a housing 39 covered with a cover 40 fastened to the housing 39 by screws. The surface of cover 40 facing the diaphragm is shaped simi-larly as the abu~nent piece 53 in Fig~ 6 to have a concave recess 54. The diaphragm is controlled by a pressure . _ ~_ _~
~ 80 1 ¦ fluid such as a pressure air or pressure water intro-¦ duced against the upper surface of the diaphragm through ¦ the intake port 59 and the diaphragm is inverted to close ¦ the central passage in the housing 39.
¦ In the valve as illustrated in Fig. 8, the diaphragm ¦ according to Fig. 2 is arranged obliquely to the axis of ¦ the main passage o~ the valve housing 39 and moves per-¦ pendicularly to an oblique valve seat 61. In this ar-¦ rangement, the diaphragm abuts against the valve seat 61 ¦ along the apex line 62 of the outer convex marginal por-¦ tion 14 acting as the sealing surface, This apex line ¦ can be reinforced by pro~ections 63. The diaphragm is ¦ moved by means of a hand wheel 44 and a threaded spindle ¦ 45 which at its free lcwer end has a threaded boring 64 ¦ engaging the thread of the pin 50 embedded in the diaphragm I
¦ Fig. 9 il~ustrates a valve having the diaphragm 10 i ¦ arranged in a valve housing 65 made of a teflon block which ¦ is shaped, for example, by mechanical machining. This teflon block is surrounded by two metallic half shells ' 20 I connected one to another by bolts 66 and 67. The abutment ¦ piece 53 cooperating with the bulging central portion of ¦ the diaphragm is also assembled of two halves screwed together by bolts 68 and 68a. The apex of its bulging central part on the inner side 13 has an extension 69 11(?~
1 ¦ provided with an undercut 70. A connection pin 71 is em-¦ bedded in the extension 69 and is connected to a spindle ¦ 72. In addition, the abutment piece 53 engages the under-¦ cut 70 so as to insure a reliable connection of the con-¦ trol spindle 72 to the diaphragm. The adjustment of the¦ working position of the diaphragm is carried out by means ¦ of the hand-operated wheel 44.
¦ Fig. 10 illustrates the diaphragm 10 used as the shutting element of a non-return valve having a housing 39 defining a main passage with an obliquely arranged seat similarly as the valves in Fig. 8. The vaulted lat-eral walls of the diaphragm are provided with juxtaposed openings 73 and 14. The sealing contact line of the diaphragm of Fig. 10 is similar to the apex sealing line as described in connection with Fig. 8. A reinforcing disk 31 is embedded in the bulging central portion of the diaphragm. This reinforcing member may have a star-like configuration projecting with its tips into the vaulted portion of the diaphragm body.
Fig. 11 shows a diaphragm pump in which the Clange of the diaphragm is clamped between the lower housing part 39 and the upper housing part 40. The flange 12 is sur-¦ rounded by tching recesses in the housing part, whereas .
I
11~
1 the bulging central pa~t projects into the interior of the upper housing part 40 and is provided with an embedded threaded pin passing through the recessed abutment member and threaded to a fork 75 provided with a pivot pin 76.
The pin 76 supports a crank lever 77 linked at the other end to an eccentric pivot pin 78 on a driving wheel 79.
The intake of the fluid takes place at the intake port . of a non-return valve in a direction indicated by arrow 80, whereas the discharge of the fluid is affected through another non-return valve in the ~irection of arrow 81.
The passage between the two non-return valves communicates with the variable space between the bottom of the housing part 39 and the lower side of the diaphragm 10. The di-aphragm pump can handle relatively large pressures such as, for example, 10 bars.
.
Fig. 12 shows the application of the diaphragm of this invention as a sealing element of a shut-off flap 82 supported in a housing 84 eccentrically by a rotary shaft 83. Due to this eccentric arrangement the shut-off . 20 flap defines a continuous sealing surface along its whole periphery and reliably seals in both directions of flow.
For this purpose the flap 82 is provided along its peri-phery with a groove 85 into which the flange 18 of the diaphragm 10 snugly fits, whereby the outer periphery 20 of the flan acts as a sealing surface. The bulging -~8-- ~ . .
1~4~8~) central portion of the diaphragm is connected to the center of the disk-shaped shut-off flap 82 by the connect-ing pin 50.
Fig. 13 shows a modification of a shut~off flap in which the shut-off disk 82 has an increased diameter with respect to the disk of Fig. 12 and the diaphragm lOa of this invention has a ring-shaped configuration with an opening in its center and is secured to the marginal sec-tion of the disk 82 to perform merely its sealing func-tion. In the reinforced inner margin of the diaphragm lOa there are embedded connecting pins 50 and 50a similar to the pin 50 in Fig. 12 and are secured by nuts 86 and 86a to the disk 82. As long as no pressure fluid is sup-plied into the main conduit, the outer rim 20 of the diaphragm is only as a loose contact with the inclined sur-face of the valve seat 81 and the flap can be easily op-erated. If a pressure fluid is admitted into a conduit in the direction of arrows 8~, the outer rim 20 sealingly engages the surface 88.
20 ¦ It will be understood that each of the elements de-scribed above, or two or more together, may also find a useful application in other types of constructions differ-ing from the types described above.
.
1~ 80 1 While the invention has been illustrated and described a~ embodied in a diaphragm, it is not intended to be lim-ited to the details shown, since various modifications and structural changes may be made without departing in S any way from the spirit of the present invention. .
Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can . by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential char-acteristics of the generic or specific aspects of this invention.
What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims.
Claims (22)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A diaphragm of flexible material, comprising a shaped body symmetrical about a central axis, a peripheral flange extending in an attachment plane, an annular region adjoining said flange and having a convex shape with re-spect to said attachment plane, a central region having a concave configuration with respect to said attachment plane, the thickness of said convex annular region and of said center region increasing progressively from said flange toward said central axis.
2. The diaphragm as defined in claim 1, wherein the surfaces of said concave central region form a stream-lined transition with the surfaces of said convex annular region.
3. The diaphragm as defined in claim 1, wherein the upper surface of said annular region intersects at one point in the center of said concave central region.
4. The diaphragm as defined in claim 2, wherein the inner side facing said attachment plane forms a con-cave bulge having a larger base than the concave de-pression at the opposite outer surface.
5. The diaphragm as defined in claim 1, wherein the ratio of its diameter to the height of its convex por-tion is between 2.5 and 3.5.
6. The diaphragm as defined in claim 1, wherein the radial dimension of said annular convex portion on the upper surface of the diaphragm body (z) is larger than the diameter of the concave portion (Y) and the radial dimension of the convex annular portion on the lower side of the diaphragm body is smaller than the diameter of the base of the concave central portion of the lower side of the diaphragm body.
7. The diaphragm as defined in claim 6, wherein the annular convex upper surface portion is between 70 and 90% of the entire upper surface area.
8. The diaphragm as defined in claim 6, wherein the radian of the axial section of the annular convex portion of the inner side of the diaphragm facing the attachment plane is at least 45° and the radian of the corresponding outer convex section is at least 70°.
9. The diaphragm as defined in claim 1, wherein said flange projects inwardly toward said concave central portion.
10. The diaphragm as defined in claim 9, wherein the entire outer surface of said diaphragm is its work-ing surface.
11. The diaphragm as defined in claim 9, wherein a small portion of said flange projects outwardly.
12. The diaphragm as defined in claim 1, wherein said concave central portion is extended to form a pro-jection having an elliptical cross-section the periphery of which is situated below said attachment plane and projects partially into the space bounded by said an-nular convex portion.
13. The diaphragm as defined in claim 12, wherein said elliptical extension of said central portion extends at an oblique angle relative to said attachment plane to act as a shut-off element of a diaphragm valve.
14. The diaphragm as defined in claim 1, further including a connection pin embedded in said concave central portion of the diaphragm body and projecting outwardly from the inner side of said diaphragm body.
15. The diaphragm as defined in claim 1, further including an abutment member cooperating with the inner side of the concave central portion of the diaphragm and having one side provided with a corresponding concave recess.
16. The diaphragm as defined in claim 1, in combina-tion with a valve housing defining a main passage with a valve seat and a cover member arranged opposite said valve seat, said diaphragm being clamped between said valve housing and said cover member, said cover member facing the inwardly bulging part of said central portion of the diaphragm being provided with a corresponding recess to accommodate said bulging part.
17. The diaphragm as defined in claim 1, in com-bination with a shut-off valve housing defining a main passage and a valve seat arranged obliquely to said main passage, wherein the apex line of said convex annular portion of said diaphragm body cooperates with said valve seat to shut off said central passage.
18. The diaphragm as defined in claim 14, wherein said apex line is reinforced by a corresponding ring-shaped projection.
19. The diaphragm as defined in claim 1, in combination with a valve housing defining a main pas-sage and a straight valve seat in said passage, wherein said diaphragm is arranged for movement against said valve seat transversely to said passage so that juxta-posed portions of the outer surface of said convex an-nular part close and open said passage.
20. The diaphragm as defined in claim 1, in combination with a housing of a non-return valve wherein said diaphragm has two diametrically opposed openings formed in said convex annular portion.
21. The diaphragm as defined in claim 1, in combination with a shut-off flap comprising a shut-off disk having a peripheral groove adapted for engaging said peripheral flange and a central concave recess for accommodating the bulging central portion of said di-aphragm and fastening means embedded in said central por-tion and secured to said disk.
22. The diaphragm as defined in claim 17, wherein said central portion of the diaphragm defines an axial passage bridged by said disk.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2821167.8 | 1978-05-13 | ||
| DE2821167A DE2821167C3 (en) | 1978-05-13 | 1978-05-13 | Membrane to keep two neighboring rooms separate |
| DE19782848737 DE2848737C2 (en) | 1978-11-10 | 1978-11-10 | Membrane to keep two neighboring rooms separate |
| DEP2848737.8 | 1978-11-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1104380A true CA1104380A (en) | 1981-07-07 |
Family
ID=25774476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA326,953A Expired CA1104380A (en) | 1978-05-13 | 1979-05-04 | Diaphragm of elastic material and arrangement using the same |
Country Status (20)
| Country | Link |
|---|---|
| AR (1) | AR216228A1 (en) |
| AT (1) | ATA270879A (en) |
| AU (1) | AU526663B2 (en) |
| BR (1) | BR7902923A (en) |
| CA (1) | CA1104380A (en) |
| CH (1) | CH649609A5 (en) |
| CS (1) | CS324979A2 (en) |
| DK (1) | DK193779A (en) |
| ES (1) | ES252859Y (en) |
| FI (1) | FI791304A (en) |
| FR (1) | FR2425588A1 (en) |
| GB (1) | GB2021734B (en) |
| HU (1) | HU184708B (en) |
| IL (1) | IL57209A (en) |
| IT (1) | IT1124066B (en) |
| MX (1) | MX149475A (en) |
| NL (1) | NL7903791A (en) |
| PL (1) | PL129656B1 (en) |
| SE (1) | SE7904119L (en) |
| YU (1) | YU108279A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2128253A (en) * | 1982-09-25 | 1984-04-26 | Ti Interlock Ltd | Diaphragm actuator |
| GB2280713A (en) * | 1993-08-04 | 1995-02-08 | Richard Gardiner | A pneumatic ejector |
| GB9316126D0 (en) * | 1993-08-04 | 1993-09-22 | Gardiner Richard | A pneumatic ejector |
| US6179406B1 (en) | 1997-09-19 | 2001-01-30 | Toshiba Tec Kabushiki Kaisha | Ink-jet printer with ink nozzle purging device |
| JP5964140B2 (en) * | 2012-05-30 | 2016-08-03 | 株式会社フジキン | Diaphragm and diaphragm valve |
| DE102018102062A1 (en) * | 2018-01-30 | 2019-08-01 | Protechna S.A. | Removal fitting for liquid containers |
| WO2020002966A1 (en) * | 2018-06-25 | 2020-01-02 | Capitanio Airpumps S.R.L. | Shutter device preferable for multi-way valves and multi-way valve comprising one or more of the aforementioned shutter devices. |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2701118A (en) * | 1949-09-03 | 1955-02-01 | White S Dental Mfg Co | High-pressure valve |
| GB901183A (en) * | 1957-11-08 | 1962-07-18 | Saunders Valve Co Ltd | Improvements in and relating to diaphragm valves |
| FR1211043A (en) * | 1958-09-30 | 1960-03-11 | Diaphragm valve | |
| FR1308069A (en) * | 1961-09-29 | 1962-11-03 | Cheltenham Auto Controls Ltd | Improvement in diaphragm valves |
| US3310279A (en) * | 1964-05-14 | 1967-03-21 | Grinnell Corp | Diaphragm valve and diaphragm therefor |
| GB1090868A (en) * | 1965-07-26 | 1967-11-15 | Saunders Valve Co Ltd | Diaphragm valves and diaphragms therefor |
| GB1164497A (en) * | 1965-11-16 | 1969-09-17 | Grinnell Corp | Diaphragm Valve |
| AT356989B (en) * | 1975-03-11 | 1980-06-10 | Wurzer Lothar | DEVICE FOR SEPARATING TWO NEIGHBORING SPACES OF THE SAME OR DIFFERENT PRESSURE BY MEANS OF A MEMBRANE |
-
1979
- 1979-04-11 AT AT0270879A patent/ATA270879A/en not_active Application Discontinuation
- 1979-04-19 FR FR7909918A patent/FR2425588A1/en active Granted
- 1979-04-19 GB GB7913727A patent/GB2021734B/en not_active Expired
- 1979-04-23 FI FI791304A patent/FI791304A/en not_active Application Discontinuation
- 1979-04-24 AR AR276283A patent/AR216228A1/en active
- 1979-04-27 CH CH3999/79A patent/CH649609A5/en not_active IP Right Cessation
- 1979-05-02 MX MX177499A patent/MX149475A/en unknown
- 1979-05-04 CA CA326,953A patent/CA1104380A/en not_active Expired
- 1979-05-04 IL IL57209A patent/IL57209A/en unknown
- 1979-05-09 YU YU01082/79A patent/YU108279A/en unknown
- 1979-05-09 IT IT12588/79A patent/IT1124066B/en active
- 1979-05-10 DK DK193779A patent/DK193779A/en unknown
- 1979-05-10 SE SE7904119A patent/SE7904119L/en not_active Application Discontinuation
- 1979-05-10 AU AU46939/79A patent/AU526663B2/en not_active Ceased
- 1979-05-11 BR BR7902923A patent/BR7902923A/en unknown
- 1979-05-11 HU HU79WU29A patent/HU184708B/en unknown
- 1979-05-11 ES ES1979252859U patent/ES252859Y/en not_active Expired
- 1979-05-11 PL PL1979215509A patent/PL129656B1/en unknown
- 1979-05-12 CS CS793249A patent/CS324979A2/en unknown
- 1979-05-14 NL NL7903791A patent/NL7903791A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| PL215509A1 (en) | 1980-01-28 |
| FR2425588A1 (en) | 1979-12-07 |
| AR216228A1 (en) | 1979-11-30 |
| AU4693979A (en) | 1979-11-15 |
| IT1124066B (en) | 1986-05-07 |
| NL7903791A (en) | 1979-11-15 |
| IT7912588A0 (en) | 1979-05-09 |
| SE7904119L (en) | 1979-11-14 |
| IL57209A (en) | 1985-01-31 |
| FR2425588B1 (en) | 1984-01-27 |
| MX149475A (en) | 1983-11-10 |
| CH649609A5 (en) | 1985-05-31 |
| GB2021734B (en) | 1982-09-15 |
| ATA270879A (en) | 1985-06-15 |
| YU108279A (en) | 1983-10-31 |
| ES252859Y (en) | 1984-02-16 |
| IL57209A0 (en) | 1979-09-30 |
| ES252859U (en) | 1983-08-01 |
| PL129656B1 (en) | 1984-05-31 |
| FI791304A (en) | 1979-11-14 |
| BR7902923A (en) | 1979-12-04 |
| HU184708B (en) | 1984-10-29 |
| AU526663B2 (en) | 1983-01-27 |
| CS324979A2 (en) | 1985-05-15 |
| DK193779A (en) | 1979-11-14 |
| GB2021734A (en) | 1979-12-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |