EP2291245A1 - Joint pour dispositif de dosage de liquides - Google Patents
Joint pour dispositif de dosage de liquidesInfo
- Publication number
- EP2291245A1 EP2291245A1 EP09729290A EP09729290A EP2291245A1 EP 2291245 A1 EP2291245 A1 EP 2291245A1 EP 09729290 A EP09729290 A EP 09729290A EP 09729290 A EP09729290 A EP 09729290A EP 2291245 A1 EP2291245 A1 EP 2291245A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- seal
- piston
- cylinder
- contact
- wall
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
- B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
-
- 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
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/06—Fluid handling related problems
- B01L2200/0605—Metering of fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0475—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure
- B01L2400/0478—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure pistons
Definitions
- the present invention relates to a device for dosing liquids, particularly in a laboratory. It therefore relates more particularly to the dosing of liquids in relatively small quantities but exact, for example of the order of ⁇ l up to 100 ml. More particularly, the invention relates to a pipette, a bottle dispenser or a syringe.
- Document US 2002/0012613 may be cited as an example for an approach which concerns the ergonomics of the dosing instrument consisting of a pipette. This approach aims to adapt the shape of the pipette to the hand of the user, so that it fits more easily in the hand and can be manipulated more easily.
- the suction of the liquid is carried out by means of a vacuum, which is created when the piston housed inside the pipette, pressed through the metering knob, goes up inside the body of the the pipette to its high stop position.
- a gasket is generally used, which forms a seal between the inner wall of the pipette cylinder and the piston.
- the seal is arranged to exert a normal bearing force N to the piston, or, if it is housed on the piston, on the inner wall of the cylinder.
- the spring which is used to push the piston back to its original high stop position, must be strong enough to overcome the friction exerted by the seal on the piston.
- an annular rubber or elastomer seal called O-ring or o-ring is often used to seal the piston. and the wall of the cylinder.
- US 6926867 may be cited as an example.
- O-ring seal With a full-section O-ring seal, the resulting friction is relatively high on plastics, even in the presence of lubrication.
- the seal tolerances are proportionately larger as the dimensions are smaller. This is manifested by a variable and sometimes high compression ratio and contact pressure to guarantee watertightness. Reduced tolerances on the O-ring seal and its housing are possible, but lead to increases in manufacturing and control costs.
- control of the resulting friction force F is difficult. A minimum and constant value, by reducing the contact pressure remains difficult to achieve without increasing the probability of leakage.
- the present invention aims to reduce the friction force exerted by a seal for sealing between the piston and the inner wall of the cylinder of the device.
- the present invention also aims a seal that maintains a seal comparable to that of the devices of the prior art while decreasing the friction force.
- the invention aims to reduce the fatigue experienced by the user during the repetitive dosing of liquids.
- the invention also aims to implement a solution that can be performed on devices of different sizes.
- the present invention aims to implement a sealing system for small dosing devices, adapted to small diameter pistons, decreasing the friction force while maintaining a good seal.
- the state of the art often proposes seals housed on the piston. These seals have the disadvantage of being difficult to produce and mount in the device when the piston has a small diameter, which is the case of small volume pipettes, for example pipettes for dosing volumes of the order of one to 200 microliters.
- the present invention also aims to implement a solution that is used not only in the field of manual dosing devices, but also in the field of electronic devices.
- a reduced friction force would allow to use a lower power engine and therefore more economical and therefore to increase the battery life as the total number of pipetting.
- the present invention also aims to implement a solution that can be used with pipettes single-channel or advantageously multi-channel to reduce the resulting total activation force.
- the present invention relates to a manual dosing device for liquids, comprising a cylinder and a piston housed inside the cylinder, the device being arranged so that, during dosing, the piston moves along its axis to perform suction or ejection of the liquid, the device further comprising a seal housed in the cylinder and arranged to provide a seal between the cylinder and the piston.
- the seal remains fixed with respect to the displacement of the piston and comprises at least two parts formed of material portions specifically shaped to locally optimize the sliding and sealing functions. on the piston, as sealing against the cylinder.
- the seal comprises a first portion which cooperates with the inner wall of the cylinder and performs the sealing functions against the inner surface of the cylinder and fixing to the latter, and a second part which is in contact with the piston, and which ensures the sealing functions between the seal and the piston and sliding between these two parts.
- the invention relates to a manual dosing device for liquids, comprising a cylinder, a piston sliding in the cylinder to meet and under the effect of the force of a spring, and a seal housed between an inner wall of the cylinder and an outer wall of the piston, characterized in that the seal is an annular piece shaped with respective peripheral and inner annular portions.
- peripheral portion is arranged for a fixed attachment to said inner wall of the cylinder and said inner portion is arranged for continuous sliding and sealed against the outer wall of the piston, the latter being cylindrical.
- FIG. 1 represents a seal for the metering device according to a first embodiment of the invention, this seal being shown in perspective.
- Figure 2 shows the seal of Figure 1 in axial section.
- Figure 3 shows a seal of Figure 1 in vertical elevation.
- Figure 4 shows in axial section a cylinder, a piston and a seal of a device according to the invention.
- FIG. 5 is an enlarged view of detail C of FIG. 4.
- Figure 6 shows schematically, on a larger scale and in axial section a detail of the joint shown in Figures 4 and 5.
- Figure 7 is a perspective view of a seal according to a second embodiment of the invention.
- FIG. 8 is a view in axial section of the seal of FIG. 7.
- Figure 9 is a vertical elevational view of the seal of Figure 7.
- FIG. 10 is an enlarged view of detail C of FIG. 8.
- Figure 11 is a partial axial section of a third embodiment of the device of the invention.
- Figure 12 is an enlarged view of detail C of the device shown in Figure 11.
- Figure 13 is an axial section of a fourth embodiment of the device of the invention.
- FIG. 14 is an enlarged view of detail C of the device of FIG. 13.
- Figure 15 is an axial section of a fourth embodiment of the device of the invention.
- FIG. 16 is an enlarged view of the detail C of the device of FIG. 15.
- Figure 17 is an axial section of a fifth embodiment of the device of the invention.
- FIG. 18 is an enlarged view of detail C of the device of FIG. 17.
- Figure 19 is an axial section of a sixth embodiment of the device of the invention.
- FIG. 20 is an enlarged view of the detail C of the device of FIG. 19.
- Figure 21 is an axial section of a seventh embodiment of the device of the invention.
- FIG. 22 is an enlarged view of the detail C of the device of FIG. 21.
- Figure 23 is an axial section of a first embodiment of a second embodiment of the device of the invention.
- FIG. 24 is an enlarged view of the detail C of the device of FIG. 23.
- Figure 25 is an axial section of a second embodiment of the second embodiment of the device of the invention.
- FIG. 26 is an enlarged view of detail C of the device of FIG. 25.
- Figure 27 is an axial section of a third embodiment of the second embodiment of the device of the invention.
- FIG. 28 is an enlarged view of the detail C of the device of FIG. 27.
- Figure 29 is an axial section of a fourth embodiment of the second embodiment of the device of the invention.
- FIG. 30 is an enlarged view of the detail C of the device of FIG. 29.
- Figure 31 is an axial section of a fifth embodiment of the second embodiment of the device of the invention.
- Figure 32 is an enlarged view of the detail C of the device of Figure 31.
- Figure 33 is an axial section of a sixth embodiment of the second embodiment of the device of the invention.
- Figure 34 is an enlarged view of detail C of the device of Figure 33.
- Figures 1 -3 show a seal provided for a pipette according to a first embodiment of the device of the invention, this seal being respectively shown in perspective, in axial section and in vertical elevation in FIGS. 1, 2 and 3.
- the seal 1 comprises several parts 2, 3, 4, 5, 6, 7, of different shapes each fulfilling a specific function as explained below.
- Part 2 the largest, forms a rigid annular body profile and constant around its periphery. It functions as a support for the other parts and allows the seal 1 to be firmly anchored inside the cylinder of a pipette. It includes a slightly enlarged lip 5 towards the bottom and the outside of its periphery, intended to create a sealed contact with the inner wall of the pipette cylinder, as will be described in connection with the second embodiment.
- the parts 3, 4, 7 are surrounded by the body 2.
- the part 4 forms a horizontal annular connection between the inner edge 9 of the body 2 and two lips 3 and 7 of reduced thickness intended to slide in contact with the outer cylindrical face a piston forming the active element of the pipette.
- the upper lip 3 is angled upward, while the lower lip 7 is angled downwardly.
- the extreme edges of the two annular lips 3 and 7 define the size of an opening 8 in the center of the seal 1, this opening having a circular shape if we look at the seal from above.
- the seal 1 of FIGS. 1 to 3 is intended to be housed and engaged inside the cylinder and a piston passing through the seal will also be housed in the cylinder of a pipette.
- the profile of this seal in diametral section according to FIG. 2, has an axis of symmetry 15 which will coincide with the axis of symmetry of the pipette and comprises two symmetrical halves a and b each with a solid zone 2.5 fixed to the cylinder and a flexible zone 4, 3, 7 shaped for a sliding contact with the outer face of the pipette piston.
- a suitable elastomer will preferably be chosen which allows precise shaping by molding.
- Figure 4 shows in axial section the elements of a pipette to be operated by hand.
- This pipette comprises a piston 23 which is slidably housed in a cylinder 20 consisting of a lower portion 22 separated by a seal 21 of an upper portion 24.
- the seal 21 creates a seal between the lower portion 22 and the upper portion 24 of the cylinder 20.
- Figure 4 shows the piston 23 in one piece, as one
- the cylinder 20 may be made of two different pieces 22, 24 which can be connected by means of a thread.
- the purpose of the free space at the base of the cylinder 20 is to allow air to be drawn through the opening 25 of the liquid in which a nozzle attached to the base of the cylinder 20 is immersed when the piston 23 rises back into the cylinder.
- the suction force is maintained through the seal provided by the seal 21, as explained at the beginning.
- Fig. 5 shows on an enlarged scale and in axial section similar to FIG. 4 the arrangement of the seal 21 between the two upper and lower parts 22 and 24 of the cylinder 20.
- the seal 21 is housed inside the cylinder 20, just at the passage between the lower portion 22 and upper 24. If these two parts are made in two separate parts, the seal could be housed in the lower part 22 or in the upper part 24, the condition for the latter possibility being that the connection (possibly by threading) between the two parts 22, 24 is itself waterproof .
- FIG. 4 illustrates the housing of the seal 21 in the cylinder 20.
- the axial sectional view shows, as in FIG. 2, the profiles of the two symmetrical sections (a) and (b). of the annular seal, and we can see a certain relationship with the seal 1 of Figures 1 -3, the corresponding parts bearing the same reference signs.
- the seal 21 of FIGS. 4 and 5 thus comprises the body 2, the plane connection 4 and the circular lips 3 and 7, in which the smooth cylindrical face of the piston 23 slides by deforming them elastically.
- the flat annular part 4 is here, unlike FIGS. 1 -3, provided with a cylindrical rib 11 extending in the lower part of the body 2 of the seal. It accommodates recesses and improves the functional separation between the fixing of the gasket to the cylinder 20 and the flexible sealing zone against the piston 23.
- a recess (or air pocket) is a recess and / or a bulge, which creates areas of reduced thickness, these areas defining the transitions between different parts, especially between the parts fulfilling different functions.
- the lower portion 22 of the cylinder 20 has at its upper end a flat-bottomed housing 26 which receives the seal 21 and prevents any vertical displacement of the latter towards the bottom of the cylinder 20.
- a vertical upward movement is prevented mainly by the fins 6, 6 'in the form of ring sections projecting from the body 2. These fins are engaged in openings 27, 27' which through the walls of the cylinder 20.
- the body 2 is rigid enough to prevent movement of the seal 21 when a vertically oriented force upward is applied thereto.
- the flange 5 of the seal defining a perimeter slightly greater than that of the body 2 exerts a pressure on the inner wall of the cylinder 20.
- the force at the origin of this pressure can be relatively high, because no relative displacement between the seal and the cylinder is provided during operation of the metering device.
- the force exerted by it on the inner wall of the cylinder 20 is decoupled from the bearing force exerted by the same seal on the piston 23. The latter is much lower.
- Figure 5 also shows that the lips 3 and 7 surround the piston 23 and thus create a sealing contact with the piston. Thanks to the reduced thickness of the lips 3 and 7 with respect to the rigid part 2 of the seal, and thanks to the orientation of the lips, which has a vertical part, the skilled person will appreciate that the pressure exerted on the piston is lower, even substantially less than the pressure and force exerted by the seal 21 on the inner wall of the cylinder 20.
- the seal 21 has a plurality of recesses 31, 32, which decouple its different parts and thus make it possible to obtain the advantages of the invention. In particular, it is possible to reduce the friction force exerted by the seal on the piston 23.
- the lips 3 and 7 of the seal shown in Figure 5 form a closed space 30, which can serve as a reservoir for a lubricant.
- a lubricant at this point makes it possible to reduce the friction force at startup by breaking the adhesion between the seal 21 and the piston 23 following a prolonged rest period, in which the device would not have been used.
- the flexibility of the lips to the areas of contact with the piston generates micro-deformations which also make it possible to quickly recreate the interlayer lubricant film.
- the closed space 30 is shown on a larger scale in Figure 6, where the presence of a lubricant 33 is visible.
- the lubricant 33 is in particular in the area of contact between a lip 3 and 7 of the seal 21 and the piston 23.
- the lubricating film prevents / reports over time the creation of the adhesion forces and decreases the friction between the seal and the piston 23 which results in the necessary force to move the piston 23 in a vertical direction is comparatively smaller.
- the thicknesses c, c 'of the lips 3, 7 of the joint 21 are indicated. Each of these thicknesses is measured at a point of contact between the lip and the piston in a direction perpendicular to the axis of the piston. .
- This thickness (or distance) is small compared to the dimensions of the seal or the body 2 of the seal (visible in Figures 1, 2, 5).
- the distance c (and / or c ') is less than 1 mm, preferably less than 0.7 mm, less than 0.5 mm and / or even 0.5 mm. This thickness preferably applies to all or a major portion of the surface of the contact area between the seal and the piston.
- it is a connection zone between the part filling the function of anchoring the seal in its seat and / or sealing against the wall of the cylinder and the part which fulfills the sealing function with the piston which has a reduced thickness as indicated above.
- it is not necessarily the same lip that realizes the decoupling functions, but the structure that connects the parts that perform the different functions.
- this may be the annular connection 4 which is characterized by a thickness as defined in relation to the letter c and / or c 'above. It should be noted that in this case the measured thickness is the minimum thickness between two parts, in particular between the anchoring part and sealing against the cylinder (for example, part 2 of FIG.
- Figures 7 to 9 show, in perspective, in axial section and in vertical elevation and in enlarged partial section in Figure 10, a seal 40 which differs from the seal 1 shown in Figures 1 -3, in that it further comprises two transverse and parallel incisions 35, 35 'which pass through the joint in vertical directions from above to approximately the middle of the seal 40, stopping at the level of the internal connection 4 between the body 2 and the lips 3 and 7.
- the incisions 35, 35 ' are vertical slots which pass at equal distances from the central axis of symmetry 15 of the seal 40.
- the seal must be inserted through an upper opening of the cylinder 20 and through a passage having a diameter. inside which is almost identical to the diameter of the seal 40, in particular to the diameter defined by the upper edge of the body 2.
- the internal plane connection 4 and n therefore do not arrive at the rim 5, the incisions 35, 35 'do not interfere with the sealing function against the inner wall of the cylinder 20.
- the part of the seal 40 which is higher than the internal connection 4 then fulfills, in addition to the function of anchoring the seal in its housing with the fins 6, 6 ', a function of flexibility or flexibility facilitating the insertion of the seal during assembly of the pipette.
- Fig. 10 is an enlarged partial sectional view of Fig. 8, indicated therewith with a circle. The features highlighted in the figure
- a contact zone 41 formed by a portion of the upper lip 3, whose surface, of low height is in the form of a hollow cylinder, is then recognized in FIG.
- this contact surface 41 means that the whole of this contact surface is reduced.
- the reduction of the contact surface between the seal 40 and the piston 23 is equivalent to a reduction in the friction force by adhesion at rest and during a relative displacement between these two elements.
- an asymmetric profile segment 43 of the lip 3, which is curved so as both to determine and to minimize the contact surface 41, is particularly recognizable.
- Figure 10 also shows a contact zone 42 of the lower lip 7 with the piston 23 (not shown).
- the profile of this lip 7 does not have the asymmetrical concave shape 43 of the upper lip 3, but the contact zone 42 is nevertheless clearly defined and delimited with respect to the remainder of the lip 7.
- Figures 11 and 12 show in general axial section and in partial and enlarged axial section an embodiment of the invention comprising a seal 50.
- the seal 50 is simpler than the joints 1, 40, discussed above, but includes also two lips which are in contact with the piston 23. If we consider (fig.12) the profile of the seal in an axial section limited to one half of the assembly relative to the axis of the piston we realize because the seal 50 is less asymmetrical than the previous joints 1, 40. It is obvious that the seal 50 has in fact a plane of symmetry perpendicular to the axis of the pipette and in the plane of FIG. 12 is reduced to an axis of symmetry d particular to the profile shown in this figure.
- the seal 50 comprises two body segments 56 and 57.
- the two segments are not symmetrical with respect to the axis d because of the presence of the rim 5 on the segment of body 53 and a slightly deviating structure on the opposite body segment 57.
- the cylindrical outer face of the body segments 56 and 57 is in contact with the cylinder 20.
- the seal Internally, that is to say in contact with the piston 23, the seal has two lips that are equally symmetrical with respect to the axis d. Between the support elements 56 and 57 extends a recess 53 which delimits two junctions or flexible connections 58 and 59. If we ignore the few small differences in the parts 56 and 57, responsible for anchoring the seal in its housing, we identify a single axis of symmetry d.
- the hollow support 2, present in the joints 1 and 40, is transformed into two support portions 56 and 57, arranged one vertically above the other and separated by a recess 53.
- This recess 53 creates two junctions 58 Approximately 59, which join the support portions 56 and 57 to the lips.
- the fineness of the junctions 58, 59 determines the mechanical decoupling between the stiffness of support portions 56 and 57 at relatively large volume and flexible lips.
- seals 1, 40 and 50 are made in one piece and made of a single material, usually an elastomer.
- the differences in stiffness and / or flexibility of the different parts of the joints are due to the different thicknesses of these parts or to the volume occupied by the material by and in these parts.
- the seal 50 is retained in its housing by means of a retaining ring 55, which is placed in a notch 54 of the pipette body 20.
- the seal 50 is inserted through an upper opening in the cylinder 20 and engaged to the inner flange 26. Then, the retaining ring 55 is inserted and stopped at the notch 54.
- the relatively rigid support members 56 and 57 realize the fixed and stationary placement of the seal 50 inside its housing in the cylinder 20.
- FIGS. 13 and 14 also respectively show, in enlarged general and partial axial section respectively, an embodiment of the invention comprising a single lip seal 7 produced in the image of a lower lip of the preceding embodiments (FIG. joints 1, 40 and 50).
- the general structure of this seal 60 has several parts in common with the embodiment shown in FIGS. 11 and 12, and the corresponding parts are indicated with the same reference numerals.
- the half-section of the seal 60 shown in FIG. 14 has no axis of symmetry.
- the seal comprises a single lip, similar to the situation shown in FIGS. 13 and 14, with the difference that the single lip is oriented upwards, in correspondence with an upper lip of one of the embodiments described above.
- This embodiment also has its advantages, since the upwardly facing single lip has a high sealing function when returning the piston, which is important. During the aspiration of the liquid, the reduction of the friction obtained by eliminating the upper lip is an advantage.
- FIGS. 15 and 16 show an embodiment according to the invention, comprising a seal 70 whose supporting portion 72 in the form of a hollow cylinder comprises and largely surrounds a rigid stabilizing element 78 made of a different and stiffer material than the rest of the seal 70, for example a metal core.
- the latter is therefore made of two different materials.
- the lower lip 77 and the upper lip 73 of the gasket 70 are symmetrical ( Figure 16: half section of an axial section).
- the outer portion of the solid half-section 72 has a sealing flange 5, operating as discussed above, and contains the stabilizing element 78 of asymmetrical shape.
- This element comprises several parts which, in the radial sectional view of FIG. 16, appear in the form of arms 79, 71, 78, but which, in consideration of the three-dimensional shape of this element 75, constitute a short tubular element 79, and two extensions in the form of flat rings 71, 78 of different diameters, respectively connected to the center and the upper end of the tube 79, and oriented one towards the inside and the other towards the outside of the cylinder.
- the outer ring 78 passes through the body of less rigid material of the seal 70 to engage a groove 74 in the inner wall of the cylinder 20, thereby anchoring the seal 70 in the hollow cylinder 20.
- the extension upper 78 operates in a similar manner to the holding washer 55 of FIG. 12.
- this "holding washer 55" constituted by the extension 78 is an integral part of the seal 70.
- the use of an element 78 in a second material, more rigid than the base material in which the lips are formed allows both (a) to obtain a more rigid support function, performed by the support cylinder. 72, and (b), at least in part, anchoring the seal 70 within the cylinder using the interaction between the elements 78 of the seal and 74 of the wall of the cylinder 20
- the present invention also relates to seals made in one piece of several materials of different stiffnesses. These different rigidities allow the formation of parts of the seal which reinforce its anchoring in the cylinder, for example by their interaction with stop points, such as a groove or openings, present in the cylinder 20.
- FIGS. 17 and 18 show another embodiment of the subject of the invention, according to which, as for the embodiment shown in FIGS. 15 and 16, the seal 80 is constituted of a single piece but includes parts made of different materials. As in Figures 15 and 16, one of the materials is stiffer than the other. In FIGS. 17 and 18 is the tube 85, which is surrounded or largely embedded and supports an elastic material providing the sealing functions against the piston 23 and the cylinder 20.
- the rigid element 85 comprises an upper bulge 88, which projects beyond the less rigid material of which the lips are constituted.
- This upper bulge 85 is formed so as to engage in a groove
- seals shown in Figures 15 and 16 or 17 and 18 may be manufactured, for example by overmolding, bi-injection or other composite process.
- the two elements may be manufactured separately, and the less rigid portion may be engaged on the rigid portion, for example.
- other manufacturing possibilities exist and can be chosen by those skilled in the art.
- Figures 19 and 20 show another embodiment of the present invention.
- the seal 90 has a tubular support piece 92 with a more elongated shape than the previous embodiments.
- the connecting element 4 starts from a region close to the base of the support tube 92 and opens into the two lips 93 and 97, which, in the embodiment shown in FIGS. 19 and 20, are shaped differently, the lip lower 97 being a little more elongated than the lip 93.
- the support tube 92 is thinner than in the previous embodiments. This type of embodiment allows attachment without openings in the cylinder wall. It is advantageous, for example, for small seals placed in "deep" seats of cylinders, for example for multichannel pipettes.
- the support cylinder 92 Towards its upper end, the support cylinder 92 has an outer rim 98, which cooperates with a groove 94 in the cylinder so as to reinforce the anchoring of the gasket 90 in the cylinder 20 of the metering device.
- connection area 4 in the form of an internal flange starts from the support tube 92, firstly describes a downward curve and relies on the internal flange 26 of the cylinder 20. Then the flange 4 is divided into two lips 93 and 97, as described above. Thus, a recess 95 is formed between the flange 4 and the lower end of the support tube 92, ideally separating the support and sealing functions with the wall of the cylinder 20 from the seal on the rim 5 with the piston 23.
- Figures 21 and 22 show an embodiment with a seal 100 similar to that of Figures 19 and 20, but differing in that the inner flange 4 of the seal 100 from the lower end of the support tube 102.
- the seal 100 has a plurality of sealing ribs 103, 104 and 105 on the outer surface of the support tube 102. These compressive sealing ribs replace the widened flange 5 of the previous embodiments and assume the function of sealing against the inner wall of the cylinder 20.
- Figures 23 and 24, as well as the following figures, relate to embodiments which differ from the previous embodiments by the absence of lips such as the lips 93 and 97, for example.
- the sealing function against the piston 23 is accomplished by a part which, according to the half-profile shown in FIG. 24, for example, has the shape of a curved line 112, 114 oriented towards the axis of the piston and whose the enlarged proximal zone 114 is in contact with the piston. Seen in three dimensions, this type of seals is a tubular element whose central part has a sinuous shape similar to a bellows.
- the shape and arrangement of the seal 110 in its housing of the cylinder 20 are such that a large air pocket 115 is present, filling a very large part of the annular volume between the cylinder and the seal opposite the piston .
- the skilled person will appreciate that with this recess, the pressure and therefore the friction force exerted on the piston is greatly reduced compared to a rigid body of polymer material, as with O-rings, while keeping good seal.
- FIGS. 23 and 24 shows a seal 110, whose central portion 112, 114 is curved towards the center, and the middle 114 of the curve slightly touches the piston 23 thus making a tight connection with low friction force. or at low pressure.
- the lower part and the upper part 13 and 111 of the tubular element are arranged to fulfill the other functions of the joint as described below.
- the lower part of the seal 110 is arranged to form a sealed connection with the inner wall of the cylinder 20.
- a rigid ring 116 of rigid metal or polymer for example, pushes the lower part 113 towards the cylinder wall 20.
- a groove or recess 117 is in the wall of the cylinder 20, stopping or blocking the rigid ring 116. In this way, the seal 110, and in particular its lower portion 113, are immobilized in the cylinder.
- the upper end 111 of the seal 110 is straightened to a cylindrical shape and is stopped by a retaining ring 119, locked like the retaining washers described above.
- the profile of the inner face of the cylinder 20 has a narrowing 118 decreasing its internal diameter at the seal housing.
- the extent of this rim 118 makes it possible to control, for example to bring closer, the position of the lower part 113 and the ring 116 relative to the piston 23. In this way, the friction force and the sliding exerted by the seal on the piston can be better adjusted.
- Figures 25 and 26 show a seal 120 based on the same concept as that of Figures 23 and 24, with, however, some differences in embodiment.
- the holding washer 119 intended to block the upward vertical movement of the seal 110 of FIGS. 23 and 24 is not present in FIGS. 25 and 26.
- an enlarged structure 121 of the upper end of the seal 120 characterizes this embodiment giving it a high rigidity so that it can then assume the function of anchoring the seal 120 upwards.
- the enlarged structure 121 is engaged in a groove 123 of the inner wall of the cylinder 20, blocking any vertical displacement of the upper part of the gasket 120.
- the lower portion 112 of the seal also includes a widening 122, which cooperates with a groove 117, as described in the previous paragraph for the upper end of the seal 120.
- a rigid ring 116 is provided for pressing the lower part 122 of the seal towards the inner face of the cylinder 20.
- Figures 27 and 28 show other variants of the seal according to the concept described with respect to Figures 23-26.
- the sealing of the seal 130 against the piston 23 is carried out according to FIGS. 23-26, but the anchoring in the housing of the cylinder 20 is modified, by modifying the ends of the seal 130.
- Figures 31 and 32 show a variant of the concepts of Figures 23-30, in that the curved shape oriented towards the axis of the piston and whose proximal zone is in contact with the piston, in the view of the half profile of FIG. 32, two vertices forming contact points 153 and 157 rounded and creating a closed space 154 limited by the seal 150 and the piston 23.
- the contact points 153 and 157 are indeed rings or hollow contact cylinders, coaxial with the piston 23 and located in planes parallel to one another.
- the closed space 154 has the three-dimensional shape of a ring.
- the closed space 154 of the seal 150 has the same function as the closed space 30 shown, for example, in Figure 5 or in more detail in Figure 6. This space therefore serves as a lubricant reservoir and thus contributes good sliding during the vertical displacement of the piston 23 along its axis during dosing.
- Figures 33 and 34 show an extension of the principle shown in Figures 31 and 32, with a seal 160 comprising, in the half-profile of Figure 34, three contact points 161, 162, 163 rounded with the piston 23 enclosing two spaces 164 and 165.
- the contact points are in a central zone of the seal limited upwards and downwards by portions of the seal 160 in the form of conical walls 155 and 156 inverted.
- the whole of the seal 160 is relatively rigid, including in the curved zone, but that this fact is partly compensated by the rounded contact areas 161, 162, 163 which are small and easily deformable at the start of the piston, which allows regeneration of the lubricating interface film and reduces the friction force by contact zone.
- molded elastomers of the FPM type preferably for temperature resistance of 15 to 150 ° C., which constitutes the usual range of use / sterilization for laboratory instruments.
- elastomers are silicone, "butyl rubber", copolymers of ethylene and propylene, vinylidene fluoride and hexachloropropylene copolymer, among others.
- complementary processes are envisaged to further reduce the frictional forces of an elastomer, in particular those of adhesion at rest (surface creation of reactive repulsion groups).
- Peripheral treatment of the seal and / or the addition of internal lubricants are techniques according to the invention. These include the creation of micro-reservoirs of lubricant by "sandblasting / cryogenization", halogenation or surface molecular structural transformation by plasma spraying as well as the incorporation of "alloy” elements in the matrix, these elements being chosen, for example, from fluorinated powders and / or lubricants. If a lubricant is used, it can intervene in simple addition or be grafted.
- the seal comprises an elastomer including, in its matrix, an alloying element
- the volume proportion of said alloying element will be chosen less than or equal to 30%, preferably less than or equal to 25%, of the volume. total elastomer.
- At least a portion of the seal is made of a material having a hardness of less than 75 Shore A.
- the Shore A hardness of the material will be between 30-75, or else 40 to 70.
- any portion in sealing contact with the piston will be characterized by the Shore hardness values indicated above.
- the lips shown in Figures 2, 4-6, 8, 10 and 11 -22, or the contact areas 114 of Figures 23-30, and 153, 157, 161, 162, 163 of Figures 31 -34 shall be made of a material having the characteristics of Shore indicated above.
- the device according to the invention is characterized by the use of a seal comprising parts with different geometric characteristics and / or different volumes. Due to the characteristics of the seal it is possible to reduce the frictional force exerted by the seal on the piston.
- the friction force must be "Fressort, which pushes the piston and whose level is adjusted to ensure accuracy of contact against the mechanical stops determining good volumetric performance.
- the friction force can be reduced to about 1 N.
- the friction force is ⁇ 0.6 N preferably ⁇ 0.5 N, ⁇ 0.4 N and even ⁇ 0.35 N.
- the devices of the invention make it possible to dose volumes between 1 .mu.l to 200 ml.
- the device of the invention may be a pipette or a doser for the assay of volumes of 1 to 1000 .mu.l, 0.1 or 0.2 to 2 ml, 0.1 or 0.5 to 5 ml, and / or 1 to 10 ml.
- the device of the invention may be an adjustable micropipette covering a volume chosen in the ranges of 50-1000 .mu.l, 10-200 .mu.l, 1-100 .mu.l, 1-50 .mu.l, and 0.5-10 .mu.l.
- the material is sterilizable at temperatures of about 121 to about 134 ° C.
- the diameter of the piston of the device may be, for example, 1.5 to 10 mm.
- the piston of the device has a diameter of less than 6 mm, preferably ⁇ 5 mm, even ⁇ 4 mm, even ⁇ 3.5 mm, or even ⁇ 3 mm.
- the pressure variations around the working pressure do not generally exceed about ⁇ 0.2 bar, preferably 0.1 bar, or even 0.05 bar, depending on the volume.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09729290A EP2291245A1 (fr) | 2008-04-08 | 2009-04-07 | Joint pour dispositif de dosage de liquides |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08154213 | 2008-04-08 | ||
EP08154368A EP2108450A1 (fr) | 2008-04-11 | 2008-04-11 | Joint pour dispositif de dosage de liquides |
PCT/IB2009/051451 WO2009125337A1 (fr) | 2008-04-08 | 2009-04-07 | Joint pour dispositif de dosage de liquides |
EP09729290A EP2291245A1 (fr) | 2008-04-08 | 2009-04-07 | Joint pour dispositif de dosage de liquides |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2291245A1 true EP2291245A1 (fr) | 2011-03-09 |
Family
ID=40872273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09729290A Pending EP2291245A1 (fr) | 2008-04-08 | 2009-04-07 | Joint pour dispositif de dosage de liquides |
Country Status (3)
Country | Link |
---|---|
US (2) | US8900526B2 (fr) |
EP (1) | EP2291245A1 (fr) |
WO (1) | WO2009125337A1 (fr) |
Families Citing this family (16)
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FR2852250B1 (fr) * | 2003-03-11 | 2009-07-24 | Jean Luc Jouvin | Fourreau de protection pour canule, un ensemble d'injection comportant un tel fourreau et aiguille equipee d'un tel fourreau |
WO2009125337A1 (fr) * | 2008-04-08 | 2009-10-15 | Socorex Isba S.A. | Joint pour dispositif de dosage de liquides |
US8557197B2 (en) * | 2008-11-05 | 2013-10-15 | Hamilton Bonaduz Ag | Radial sliding seal component for metering devices and metering device having such a radial sliding seal component |
JP5194146B2 (ja) * | 2010-12-28 | 2013-05-08 | ジルトロニック アクチエンゲゼルシャフト | シリコン単結晶の製造方法、シリコン単結晶、およびウエハ |
WO2014089082A1 (fr) * | 2012-12-04 | 2014-06-12 | Aptargroup, Inc. | Emballage distributeur de produit fluide et pompe à membrane destinée à être utilisée dans ledit emballage |
CA2906001C (fr) * | 2013-03-15 | 2020-06-30 | Douglas Scientific, LLC | Lavage par pipettes |
US10416046B2 (en) | 2013-04-11 | 2019-09-17 | Rarecyte, Inc. | Device, system, and method for selecting a target analyte |
US9044750B2 (en) * | 2013-08-01 | 2015-06-02 | Ome Technology Co., Ltd. | Pipette and a nucleic acid purification apparatus |
EP3202447A4 (fr) * | 2014-10-02 | 2018-06-13 | Terumo Kabushiki Kaisha | Ensemble de seringue, seringue préremplie, capuchon d'étanchéité pour gaine avec aiguille de ponction, et emballage d'ensemble de seringue |
US10016755B2 (en) | 2015-01-08 | 2018-07-10 | Integra Biosciences Ag | Manual pipette with selectable plunger force |
US9625936B2 (en) * | 2015-03-05 | 2017-04-18 | Snap-On Incorporated | Integrated seal for control button |
KR101874278B1 (ko) | 2015-04-16 | 2018-07-03 | 인테그라 바이오사이언시즈 아게 | 수동 피펫을 위한 체적 조정 |
GB201611185D0 (en) | 2016-06-28 | 2016-08-10 | Provensis Ltd | Reduced sputtering syringe |
DE102020113090B4 (de) * | 2020-05-14 | 2022-02-03 | Carl Freudenberg Kg | Dichtring und Dichtungsanordnung, die den Dichtring umfasst |
DE102021005172A1 (de) * | 2020-10-29 | 2022-05-05 | Carl Freudenberg Kg | Wellendichtring mit Lippen, Getriebe mit Wellendichtring und Verfahren zur Schmierung eines Wellendichtrings |
EP4296546A1 (fr) * | 2022-06-22 | 2023-12-27 | Wagner International Ag | Joint d'étanchéité permettant de rendre 'étanche une plaque suiveuse par rapport à un récipient, ainsi que plaque suiveuse et dispositif de transport doté du joint d'étanchéité |
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US3935734A (en) * | 1975-02-26 | 1976-02-03 | Keegan William P | Pipettes |
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DE2651333C3 (de) * | 1976-11-10 | 1980-10-16 | Walter Sarstedt Kunststoff-Spritzgusswerk, 5223 Nuembrecht | Saugpipette |
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JP3699749B2 (ja) * | 1995-06-09 | 2005-09-28 | セーラー万年筆株式会社 | ピペット |
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DE102005033378B4 (de) * | 2005-07-16 | 2012-05-31 | Eppendorf Ag | Kolbenhubpipette |
WO2008076817A1 (fr) | 2006-12-18 | 2008-06-26 | Parker-Hannifin Corporation | Joint de pipette |
WO2009125337A1 (fr) * | 2008-04-08 | 2009-10-15 | Socorex Isba S.A. | Joint pour dispositif de dosage de liquides |
-
2009
- 2009-04-07 WO PCT/IB2009/051451 patent/WO2009125337A1/fr active Application Filing
- 2009-04-07 US US12/736,465 patent/US8900526B2/en active Active
- 2009-04-07 EP EP09729290A patent/EP2291245A1/fr active Pending
-
2014
- 2014-10-30 US US14/528,691 patent/US20150086448A1/en not_active Abandoned
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2009125337A1 * |
Also Published As
Publication number | Publication date |
---|---|
US8900526B2 (en) | 2014-12-02 |
WO2009125337A1 (fr) | 2009-10-15 |
US20150086448A1 (en) | 2015-03-26 |
US20110027149A1 (en) | 2011-02-03 |
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