RU2809730C2 - Device and method for forming sealing end from section of flexible tubular product - Google Patents

Abstract

FIELD: connection system for flexible tubes.

SUBSTANCE: device for forming a sealing end from a section of a flexible tubular product (2) contains a holder (10) of the tubular product with a sleeve (12), sized to fit onto the flexible tubular product (2), and a coupling (20), sized to the possibility of fixing the end of a flexible tube (2), bent back over the holder (10) of the tubular product. The coupling (20) and the holder (10) of the tubular product are designed to engage with each other.

EFFECT: invention enables creation of a connection only from the tubes as such, forming a fluid-tight connection and creating a connection essentially without the formation of cracks.

28 cl, 20 dwg

Description

Field of technology to which the invention relates

The present invention relates to a connection system for flexible tubing, typically, but not exclusively, silicone tubing, and includes a method for connecting such tubing, as well as fittings used in the method.

State of the art

The food, medical, pharmaceutical, cosmetics and personal care industries use disposable devices or biodegradable disposable systems to produce certain products in batches. Similar systems are also used in the dairy, brewing and beverage industries, as well as in the home care, electronics and medical industries. Some systems are not intended for small-batch production, but for stationary or semi-permanent installation in the food, medical, cosmetics and personal care industries.

The disposable device contains a flexible tubing that is typically made of silicone, but can also be made of other plastics, such as thermoplastics. Connections required in the manufacturing process to other tubing or parts of the device are typically made using flange connectors that are clamped together with a gasket placed between the flanges to create a seal. Flange connectors include a hollow, usually barbed, sleeve onto which flexible tubing is placed without the possibility of fluid leakage. This standard system is known as a "triclamp" system. The tricamp system was originally developed for connecting reusable components made of metal, usually stainless steel. However, it was later developed for use with disposable biodegradable systems containing plastics or the like, which can be sterilized by radiation, ethylene oxide or steam. In this case, other clamping devices are also used, including those fixed with cable ties, quick connection systems, threaded and other connecting systems.

It is important to note that the fluid passing through such a connection comes into contact not only with the tubing, but also with the flange connectors and gasket. They are typically made from different materials, so the biocompatibility of a given process stream must be tested with each of the three different materials to meet regulatory requirements. If there is a change in the manufacturing process, such as a change in temperature or raw material, it may be necessary to re-run the specified test on all three materials.

In addition, the use of any of these systems entails the creation of significant gaps at or around the joint, which can create dead zones and potentially waste material.

Longer-term systems may contain similar devices connected by flexible tubing connected to each other. At the same time, they also use semi-flexible or even rigid pipe products with the possibility of connecting to each other by butt welding. This technology is difficult to use and very time-consuming. The nature of the liquids, solutions and fluids passing through these tubular products requires the use of high-grade materials and sterility.

Flexible tubing is a tube capable of bending and returning to the shape in which it was formed when the bending, bending or holding force is removed. Thus, elastic deformation occurs with them. It is believed that such tubes have “memory”. Such a tube can be bent around a corner, bent in half, or expanded at one end, and when the corresponding force is removed, the tube usually returns to its original shape and dimensions. In addition, although the tube can be bent, bent and expanded, it exhibits some resistance to these actions, which usually allows it to return to its original shape and size when the force is removed.

The flexible tube is made of flexible material, an important feature of which, as mentioned above, is the ability to elastically deform. It represents the ability to deform under force; the deformation is not constant, but the resistance to deformation is essentially constant. Due to this, flexible materials are able to form a seal, since when force is applied to them, they take the shape of the surface to which they are pressed, and maintain this shape while the force is applied. This way a seal can be created. Two pieces of flexible material pressed against each other form a very good seal.

Two separate tubes are connected to each other for several reasons. These typically involve changing the diameter of the tubing to control flow or creating an appropriate size to fit into another element of the system, such as a faucet or filter.

It is desirable to reduce the amount of materials involved in such a connection to reduce the number of biocompatibility tests required for each process stream. It is also desirable to create a sterile system that is easy to use and can be used in production lines and other industrial processes.

In addition, in the water industry and other industries where liquids, fluids and solutions move, there is a need for joints of pipe products without the formation of cracks.

With this in mind, it is an object of the present invention to provide a joining system for flexible or semi-flexible tubular products that minimizes the number of materials involved in joining. In particular, the object is to create a connection from only the tubes themselves to form a fluid-tight connection and to create a connection that is substantially free of gaps.

The essence of the invention

According to the invention, a device is proposed for forming a sealing end from a section of a flexible tubular product, containing:

a tubular product holder with a sleeve sized to fit onto a flexible tubular product; And

a coupling sized to fix the end of a flexible tube bent back over the tube holder,

wherein the coupling and the tubular product holder are configured to engage with each other.

The sleeve should generally be sized to fit over the flexible tubing, and the coupling should be sized to fit tightly over the end of the flexible tubing folded back over the tubing holder. However, if the tube has a small internal diameter, bending the end can reduce the internal diameter. To avoid this, the tubular product holder can be configured with an inner diameter slightly larger than the outer diameter of the flexible tube, for example 5-20% larger, preferably 5-15% larger, most preferably 5-10% larger.

The tubular product holder will typically also include a collar extending substantially perpendicular to the sleeve. It may provide a stop for the folded-back end, and may also set an approximate distance limit for the length of the folded-back end. The collar may also form a stop for the coupling when it is pressed onto the back-curved end.

For convenience, the connection between the tubular product holder and the coupling may be a connection between the collar and the coupling.

Additionally or alternatively, the coupling may be provided with a collar extending substantially perpendicular to the coupling. The collar of the coupling may be sized to engage behind the folded back end, in this case also serving as a limit on the length of the folded back portion and the position of the coupling relative to the tube holder.

In some optional embodiments, both the tubular product holder and the coupling may be formed with a collar, with both flanges extending substantially perpendicular to the sleeve and coupling. The two beads may be positioned to engage each other to form a connection between the elements. In such embodiments, the coupling collar may be formed as a rim, and the holder collar may be provided with a step at the end distal from the rearward portion, with the rim snapping over the step.

It is also possible to use other forms of coupling between the tubular product holder and the coupling. For example, it is possible to use a screw mechanism, staples, protrusions and reciprocal recesses.

In use, a tubular holder may be placed over a portion of the tubular article, with the tubular article first being inserted into the holder at the collared end (if present) and positioned such that the distal end of the sleeve is a short distance from the end of the tubular portion. The end of the tubular piece may then be folded back onto itself over the tubular piece holder sleeve. Next, a coupling can be placed on top of the back-curved end to secure it. When the coupling and tubular holder are in place, the structures on them are aligned, connecting the elements to each other. The folded-back end defines a sealing end or surface, namely, a surface formed by the folded-back end that can be pressed against another such sealing end or even against another surface to form a fluid-tight seal.

The connection between the coupling and the tubular product holder is designed to prevent inadvertent removal of any of the elements and to ensure the correct positioning of the elements at the end of the fit. In most cases, the connection will be between the coupling and the collar of the holder, however, the connection can also be between the coupling and the bushing, in particular, in the absence of a collar. The coupling may include a protrusion near one end which, in use, will be connected to a collar, and the collar includes a mating groove or recess. The protrusion may be continuous or not continuous. Alternatively, the coupling may be provided with a rim at one end which, when in use, will be in contact with the bead, and the bead may be provided with an edge or step such that, when the coupling is inserted, it snaps over said edge or step and , thereby locking the coupling in place and confirming correct fit. In other alternatives, mating screw threads may be provided on the coupling and collar.

According to the invention, a device is also proposed for forming a sealing end from a section of a flexible tubular product, containing:

a tubular product holder with a sleeve sized to fit onto a flexible tubular product; And

a collar extending substantially perpendicular to the sleeve; And

a coupling sized to fix the end of a flexible tube bent back over the tube holder.

Two tubes with backward curved ends can be connected using a clamping system. Although other clamping systems can be used, the present invention can be used with a tricamp type system. Therefore, according to the second aspect, the device may further comprise:

a flange connector with a grip sized to engage the tubular product holder and/or coupling;

a tubular section, structurally configured to pass parallel to the specified section of the tubular product during use;

And

a flange sized to be fastened to another flange of another flange connector.

For application, the flange connector can be pulled up by the tubular holder until the connector grip rests against the collar of the tubular holder. The backward-curved ends of the tubes form a seal between the tubes, which are held in place by securing the flanges of the flange connectors using a standard disposable biodegradable clamp, namely a tricamp type clamp. The known connection would have to contain a gasket installed between the flanges; in this case the gasket would create a seal. According to the invention, the seal is created by the butt-joined back-curved ends of the tubes, which eliminates the need for gaskets. However, a gasket may be installed because it is traditional. The process flow entering the connection will come into contact with the flexible tube, but due to the fluid-tight butt joint formed by the back-curved ends of the two tubes, the fluid will not come into contact with other materials of the connection.

In an additional embodiment, the coupling may be designed as a flange connector. The flange connector is sized to retain the end of the flexible tube folded back over the tube holder, typically with a tight fit. The distal end of the coupling/flange connector includes means for engaging a tubular holder, typically a collar of the tubular holder. The upper surface of the coupling/flange connector, namely that facing outward from the tube, is shaped like a flange connector and is capable of being connected to other flange connectors, with or without a gasket between it and them.

This arrangement makes it possible to connect two back-curved ends end-to-end to each other to form a seal. Fastening of pairs of couplings/flange connectors can be provided by standard tricamp-type clamps, with or without a gasket between them. As an alternative, the use of a flange connector allows the possibility of connecting (in rare but possible cases) a back-bent tube to a non-bend tube connected to a standard flange connector using a tricamp system.

In a further embodiment, the coupling/flange connector disclosed above may serve to connect the folded back end to another flanged end, such as on a filter or other element in the system. To enable this application, the coupling/flange connector is mounted slightly back from the folded back end so that the folded back end can be pressed tightly against an additional element, such as a filter flange. The flange is made with a protrusion to create a gap to the flange of the specified other element with the possibility of connecting the flanges with a “triclamp” type clamp, with or without a gasket, while the seal is provided by the bent back end, pressed against this other element. In yet another alternative, the connection to the flat surface of another element may also be created by the coupling/flange connector discussed above, with the back-turned end protruding slightly from the set-back coupling/flange end. This allows the back-curved end to be pressed firmly against a flat surface. In a preferred embodiment, a raised ring, which may be solid or non-solid, may be located on the flange surface to align with a corresponding recess in the flat surface for a transition fit. The flange connector can then be connected to a flat surface using a clamping system.

This flat surface may be a flange connector, such as that used in a known standard tricamp system. Consequently, the flange surfaces can be secured using a standard tricamp system clamp. This allows the backward-curved end to be connected to the known standard tricamp system.

Another alternative is proposed for connection to a tricamp type system or to any system containing a flange connector. It includes a free end with a flat surface against which the back-curved end can be pressed tightly, wherein the free end contains a through passage for fluid flow. The free end is sized to be connected to the back-curved end supported by the tube holder and coupling disclosed above. This allows the folded-back end and the free end to be secured together by means of a clamp designed, in particular, to fasten a pair of folded-back ends together to form a seal. Such a clamp is disclosed in the as yet unfiled application of the present inventors. The free end is made with a part that is a continuation of the flange connector. This allows the free end flange connector to be connected to another flange connector, such as a tri-clamp system or any other flange connector.

Alternatively, other clamping systems can be used. For example, clamps designed, in particular, for fastening a pair of backward-curved ends, discussed above.

A preferred embodiment may include tubular holders with different sized bushings for different diameters of tubing. The bushings may preferably be configured with distal ends configured to be butt-jointed with tubular products of smaller or larger diameter. For example, the sleeve may include an externally thickened end for butt connection with another sleeve sized for a larger diameter tubular product. Or the sleeve may include an internally thickened end for butt connection with another sleeve sized for a tubular product of a smaller diameter. The thickening can be in the form of a taper, increasing or decreasing the thickness of the sleeve. The taper may extend the distal end of the bushing towards the center of the bushing or away from the center of the bushing. Alternatively, the sleeve may be thickened along its entire length.

It has been found that when connecting tubes of different diameters, increasing the diameter of the smaller tubes through the use of an expanding sleeve usually provides greater comfort and smoother flow paths than reducing the diameter of the larger tubes, but both or either option can be used. To create smooth flow paths, it is also preferable for the bushing edges to be rounded when using thicker bushings.

The preferred embodiment may also contain couplings of different sizes, i.e. thickness The size of the coupling depends on the diameter and thickness of the pipe product.

Depending on the type of connector used, it is preferable that the outer diameter of the coupling be the same on both tubes being connected, even if the tubes have different diameters. Therefore, it is possible to use couplings of different thicknesses to ensure that two connections with the same outer diameter can be created. The inner diameter of the coupling must ensure that the back-curved end is secured against the tubular product holder.

In some embodiments, the sleeve on the tubular product holder may include a group of protrusions or barbs for securing the folded back end to the sleeve. However, in other embodiments they are absent and are not considered mandatory.

In some embodiments, the coupling may include a small protrusion or bump at the inner end for engaging a recess in the sleeve. It helps prevent the tubular holder and coupling combination from being removed. While providing the advantage of connecting the tubular holder and the coupling to each other, as well as creating a clicking effect to indicate that the two elements are ideally positioned, it is not mandatory.

The length of the back-curved end is typically in the range of 4-16 mm, preferably 6-12 mm, and more preferably 6-10 mm.

Since the tubular product is a flexible tubular product, it will resist bending and, if bent a short distance, will unbend when the bending or holding force is removed. However, if the tube is bent back over a longer distance, the resistance of the tube to deformation will prevent extension, since in this case, at least initially, the deformation would be greater. At the same time, the bent back end is not very stable, since pushing the back bent part towards the end would require a very small force, and the length to which it would straighten out is also small.

Although the tube can only be bent back a small distance, it is generally desirable for it to be bent back a distance at which it is stable, i.e. I wouldn't bend. This distance depends on the diameter of the tube and the material from which it is made. This distance is usually substantially in the range of 75-100% of the outer diameter of the tube. Thus, the preferred length of the folded back portion is 50-125% of the outer diameter of the tube, more preferably 60-115% of the diameter, and most preferably 70-105% of the diameter of the tube. In preferred examples, the length of the folded back portion is 70-90% of the outer diameter of the tube.

Since the tube holder and sleeve are designed to support, support and protect the folded-back end, they must be sized to accommodate the folded-back end. Therefore, the tube holder along the length from the distal end to any structure providing the possibility of connection with the coupling, in particular with the collar, is configured to rest on it the folded back part. The length of the tube holder is slightly longer than the desired length of the folded back part. That is, the length of the tube holder is essentially 73-102% of the outer diameter of the tube. Thus, the preferred length of the folded back portion is 48-127% of the outer diameter of the tube, more preferably 58-117% of the diameter, and most preferably 70-105% of the diameter of the tube. In preferred examples, the length of the tube holder is 68-92% of the outer diameter of the tube.

Since the tubular holder, coupling and flange connector will not come into contact with the flow path, they can be made of any support material, typically one that can be sterilized. Disposable biodegradable systems are typically sterilized by radiation, so suitable materials include those that can be irradiated, including plastics. In most cases, the plastic may be polypropylene or polyvinylidene difluoride (PVDF). If sterilization is to be accomplished by heat treatment, the tubular holder and flange connector may be made of metal, such as stainless steel and/or plastic.

The flexible tubular product can be made of any flexible material. The properties of the flexible tubular product and flexible material are set forth above and are well known in the art.

These tubes are usually made of silicone or thermoplastic. In this case, the flexible tube can also be made of plastic containing a plasticizer to increase flexibility or reinforcement, for example, braid. In further alternatives, the tubular product may be made of latex or polyvinyl chloride (PVC).

In this case, the tubular product can have any diameter usually used in such systems. Such tubular products are usually characterized by their internal diameter. Thus, it is possible to use tubular products with an internal diameter of 1/8 inch ('') (3.175 mm), (6.35 mm), 3/8'' (9.525 mm), (12.7 mm), (19.05 mm), 1'' (25.4 mm) or 2'' (50.8 mm). The internal diameter of the tubular product is preferably 1/8'' (3.175 mm), (6.35 mm), 3/8'' (9.525 mm), (12.7 mm), (19.05 mm), 1'' (25.4 mm) or more preferably 1/8'' (3.175 mm) - (19.05 mm). It is also possible to use larger sizes of tubular products, for example, with an internal diameter of 2-3 inches (50.8 mm - 76.2 mm). The measure of diameter of known standard tubular products is the inch. In this case, it is also possible to use tubular products whose diameter is indicated in millimeters (mm). The size range of such tubular products is usually 2 mm - 20 mm. As stated above, all tubing must be flexible.

Bending the end of a tubular product may not affect the internal diameter of the tube, including the end of the tube. This is true for tubular products with large internal diameters. The size of such tubular products depends on the material from which the tube is made and its flexibility. If the tubing is made of silicone, the inside diameter at which bending does not affect the inside diameter is approximately 5/8" (15.875 mm). In the case of a tubular product with an internal diameter of no more than (12.7 mm), bending the end may result in a slight reduction in the inner diameter of the tube. This reduction in internal diameter is very small and should not cause a significant interruption of flow in the tube.

If bending the end does not affect the inside diameter of the tubing, the tubular holder will generally be sized to transitionally fit the flexible tubing, and the coupling will be sized to tightly fit the folded back end.

However, for smaller diameter tubes where bending the end results in a slight reduction in the internal diameter, it is preferable to avoid any unplanned reduction in the internal diameter of the tube to improve flow and reduce vortex. Thus, if there is a reduction in the internal diameter of smaller tubing, it is possible to use a tubular holder and a coupling with an internal diameter slightly larger than that needed for a transition fit on the flexible tubing and a tight fit on the end of the flexible tubing folded back over the tube holder. This increase in size depends on the size of the tube and the material from which it is made.

For example, for a tube with a diameter (12.7 mm), namely, for 1/2" ID x 0.717" (18.2 mm) OD tubing, the inside diameter of the press fit tubing holder shall be 0.717" (18.2 mm). In this case, in order to avoid any reduction in the internal diameter of the tube, a pipe holder with an internal diameter of 0.756'' (19.2 mm) should be used. Likewise, for a tube size (12.7 mm) folded back over the tube holder with a 0.024" (0.6 mm) bushing, the inside diameter of the sleeve should be 1" (25.4 mm). In this case, in order to avoid reducing the internal diameter of the tube and the use of the tubular product holder disclosed above, it is possible to use a coupling with an internal diameter of 1.04'' (26.4 mm). It is obvious that the internal diameters of both the pipe holder and the coupling are increased by 1 mm.

Likewise, for a tube size (6.35 mm), namely for a tube with an internal diameter and 0.488'' (12.4 mm) outside diameter, the inside diameter of the press fit tubular holder shall be 0.488'' (12.4 mm). In this case, in order to avoid any reduction in the internal diameter of the tube, it is possible to use a pipe holder with an internal diameter of 0.508'' (12.9 mm). Likewise, for a tube size (6.35 mm) folded back over the tube holder with a 0.024" (0.6 mm) bushing, the inside diameter of the sleeve should be 0.74" (18.8 mm). In this case, in order to avoid reducing the internal diameter of the tube and the use of the tubular product holder disclosed above, it is possible to use a coupling with an internal diameter of 0.76'' (19.3 mm). It is obvious that the internal diameters of both the pipe holder and the coupling are increased by mm.

To be clear, for a 1" (25.4 mm) tube (namely a 1" ID tube), the outside diameter would be 1.26" (32 mm). That is, the internal diameter of a suitable tubular product holder will be 1.26'' (32 mm). If the bushing thickness is 0.0236'' (0.6 mm), the inner diameter of the coupling can be 1.57'' (39.8 mm). With this scheme, namely, without increasing the inner diameter of the tubular product holder relative to the outer diameter of the tube, there is no decrease in the inner diameter of the tube when bending its end back.

For tubular products of other sizes, if necessary, it is possible to use a tubular product holder and coupling with correspondingly larger internal diameters, which can be easily determined by a person skilled in the art.

Alternatively, the ends of the tubular holder sleeve and coupling may be designed with a slight flare.

According to a third aspect of the invention, there is provided a method for connecting two sections of flexible tubing, comprising the steps of:

bend the end of each section of the tubular product back onto it; And

The back-curved ends create a fluid-tight connection.

The folded back ends are preferably supported by tubular holders and couplings in the first aspect.

The connection is preferably formed by pressing the folded back ends together by fastening flange connectors in the first aspect engaged with tubular holders and/or couplings in the first and second aspects.

According to another aspect of the invention, there is provided a method of forming a sealing end from a section of flexible tubular product, including the steps of:

slide the tubular product holder along the first aspect onto the end of the tube so that the collar (if any) is located at the greatest distance from the end of the tube, and the sleeve is located at a short distance from the end of the tube;

bend the end of the tube back over the sleeve, while the section of the tube bent back does not pass over the collar (if any) or beyond the end of the sleeve;

slide the coupling along the first aspect over the back-curved end; And

connect the tubular product holder and the coupling using the proposed means.

To form a fluid-tight seal from the two folded back ends, said ends can be secured to each other by a device of the second aspect. Alternatively, it is possible to use other clamping means, for example clamps designed to secure the two backward-curved ends in the sealing position.

It has been found that if the tubular product is made of PVC or other similar material, the back-curved end is less stable. In such cases, it is possible to use a piece of silicone tubing as a shock absorber for the PVC pipe product on the pipe holder. A seal may be formed between two butt-joined, back-curved ends of PVC tubing. The PVC tubing can be folded back over the sleeve according to the invention and placed over a short piece of silicone tubing secured by a coupling. This ensures a stable back-curved end is created when using PVC pipework. This system may provide an advantage, but is not required.

Additionally, depending on the composition and composition of the PVC, PVC tubing may not be flexible or resilient enough to form a seal. In such cases, it is possible to use an internal liner in the form of a silicone tube and then bend this liner over the holder of the tubular product placed on top of the PVC tube. This design can be fixed with the coupling opened above. This solution is also applicable to other tubes of limited flexibility and elasticity, namely semi-flexible or rigid tubes. The semi-flexible or rigid tube may be grooved and protrusions may be provided on the inner surface of the tubular holder sleeve to accommodate and secure the tubular holder to the semi-flexible or rigid tube. It is also possible to use other schemes for connecting the tube holder with a semi-flexible or rigid tube, but this connection is not mandatory.

The sealing folded back end can also serve as a joint and liner in a semi-flexible or even rigid tubular product. A length of silicone or other flexible tubing may be passed through the semi-flexible or rigid tubing to form a connection with another section of semi-flexible or rigid tubing also containing a silicone liner. In such cases, the length of the tube holder sleeve may be shorter. Additionally or alternatively, the sleeve may be configured with projections to align with recesses in the semi-flexible or rigid tubular article for locking. The flexible tubing liner may be folded back over the end of the semi-flexible or rigid tubing and secured by a tubular holder and coupling.

As discussed above, the folded back ends can serve to connect two tubes together, for example, to lengthen the tube or change the diameter of the tube through which liquid will flow. The back-curved ends can also serve to create a seal on other surfaces to which they are pressed. As a result, a production system may be constructed in whole or in part using back-curved ends for all or most of the seals.

Such a system must contain valves, and the valve can be created based on a section of tubular product with two ends bent back and a clamp between them. Thus, according to another aspect of the invention there is provided a valve comprising:

a section of a tubular product, wherein the end of the tubular product is bent back and supported by the device in the first aspect;

a clamp located between the ends of a tube and sized to compress the tube, causing it to collapse and plug, or to leave the tube in its open state to allow flow through the tube or to restrict flow in some way. Alternatively, the folded back portion can be connected to an additional separate flap.

The clamp may be any suitable clamp capable of collapsing to block flow. The clamps typically include rods extending downward from the top of the clamp to a clamp seat on which a tube may be located.

Such a system must also include an end cap, which can be created from a section of tubular product with one end turned back, with the clamp locked in the closed position a short distance from the back end. Thus, according to yet another aspect of the invention, there is provided an end cap comprising:

a portion of a tubular product, one end of which is folded back, the folded portion being supported by the device in the first aspect; And

a clamp that compresses the tube so that it can be crushed and sealed.

Brief description of drawings

To simplify the understanding of the invention, particular variants of its implementation will be disclosed below using examples of the accompanying drawings, where:

Fig. 1 is a cross-sectional view of one end of a flexible tube folded back over a tube holder and secured by a coupling according to the invention to form an abutment surface;

Fig. 2 is a perspective view of the end of the flexible tube in FIG. 1;

Fig. 3 is a cross-sectional view of a connection between two flexible tubes according to the invention;

Fig. 4 is a cross-sectional view of the tube in FIG. 1, further comprising a flange connector;

Fig. 5 is a cross-sectional view of an alternative arrangement comprising a flange connector;

Fig. 6 is a cross-sectional view of an additional alternative connector with a flange connector;

Fig. 7 is a cross-sectional view of a tube holder connected to a flange connector;

Fig. 8 is a cross-sectional view of a back-curved end connected to a plug containing a flange connector;

Fig. 9 is a cross-sectional view of another alternative connection between the back-curved end and the flange connector of the tricamp system;

Fig. 10 is a cross-sectional view of an alternative connection between two folded back ends using a tricamp system;

Fig. 11 is a cross-sectional view of a tube holder for subsequent connection with a tube of larger diameter;

Fig. 12 is a cross-sectional view of a tube holder for subsequent connection with a tube of smaller diameter;

Fig. 13 is a cross-sectional view of a connection between two tubes of different diameters according to the invention;

Fig. 14 is a cross-sectional view of a connection between two different tubes of different diameters according to the invention;

Fig. 15 is a cross-sectional view of a sealing joint according to the invention with a shock absorber;

Fig. 16 is a cross-sectional view of a sealing joint according to the invention formed from a flexible tube liner in a semi-flexible or rigid tube;

Fig. 17 is a cross-sectional view of an alternative seal joint according to the invention formed from a flexible tube liner in a semi-flexible or rigid tube;

Fig. 18 is a cross-sectional view of another alternative sealing joint according to the invention formed from a flexible tube liner in a semi-flexible or rigid tube;

Fig. 19 is a cross-sectional view of a valve based on a section of tube with backward-curved ends according to the invention; And

Fig. 20 is a cross-sectional view of an end cap based on a back-curved end according to the invention.

Carrying out the invention

Consider Fig. 1-3: based on the seal in FIG. 3 lies the joint between the backward-curved ends 4 of two sections of flexible tubular product 2 in FIG. 1 and 2. Bending the end of a section of flexible tube 2 creates an abutment surface, namely a sealing end or sealing surface 6. This surface is large enough, and the material of the flexible tube is sufficiently elastic, soft and pliable, due to which the abutment surface 6 can form an air- and fluid-tight seal being pressed against another sealing surface, for example another abutment surface 6 formed by the backward-curved end of another tube.

Supporting the folded back end and providing a means for pressing the abutment surface 6 formed by the folded back end to form a seal is provided by the tube holder 10. It is sized to allow a tight or transitional fit on the section of the tubular product 2, while the dimensions of the holders 10 of the tubular product can be different within a certain range depending on the flexible tubular product used.

The tube holder 10 includes a sleeve 12 with a collar 14 substantially perpendicular to the sleeve extending away from the tubular product. In use, the tube holder 10 is seated on the end of the tube such that the distal end 16 of the sleeve 12 is positioned slightly behind the distal end of the tubular piece by a distance equal to the intended folded back portion. First, the tubular product is forcefully inserted into the holder from the end with the collar so that it is located at a distance from the end of the tube. The tubular product can then be bent back over the end of the sleeve 12. Back bending can be done manually or using a tool or device (not shown).

In some embodiments, protrusions or small ridges (not shown) on the outer surface of the sleeve may assist in locking the back-curved end of the tube in position.

Folding the end of the tube 2 creates an abutment surface 6 which, when pressed against another abutment surface, forms a fluid-tight seal.

Once the tube holder 10 is positioned on the tube 2 and the end 4 of the tube is folded, there will be an abutment surface 6 formed of flexible material which will form a seal 22 with a corresponding abutment surface or some other sealing surface.

Folding the tube back on itself creates a stable structure once the end is bent back a sufficient length 8. The length 8 of the back bent part depends on the material of the tube, its thickness and diameter. The wall size of a standard tube is usually 1/8'' (3.175 mm). Flexible tubes of this size currently account for 70-80% of those available on the market. Other tubes may have wall sizes of 1/16'' (1.5875 mm) or 3/16'' (4.7625 mm).

For standard tubing used in the food, pharmaceutical, cosmetics and brewing industries, e.g. typically made of silicone and having an internal diameter (12.7 mm), the length of the folded-back portion revealed above is approximately 75-100% of the outer diameter of the tube. So, for a tube with an outer diameter of 1'' (25.4 mm), the part bent back is usually (19.05-25.4 mm). Typically a back-bent portion is used which is substantially 75% of the outer diameter of the tube. The specified length depends in part on the wall thickness of the tubular product and the softness of the tubular product. A more flexible tubular product is easier to install, and therefore is preferred in these industries.

As discussed above, the flexible tubular product can resist bending back, and if it is folded back a short distance, it will unbend when the bending or holding force is removed. Moreover, if the tube is bent over a greater distance, the resistance of the tube to deformation will prevent extension, since in this case the deformation would be greater. In this case, said bent back end is not very stable, since a very small force will be sufficient to push the bent back part towards the end, while the length to which it would straighten out in the absence of additional force is also small. The tube can be bent back a short distance, but it is generally desirable for the tube to be bent back a distance at which it will be stable, i.e. its extension will not occur. This distance will depend on the diameter of the tube and the material from which the tube is made. This distance is usually substantially within the outer diameter of the tube

Moreover, the higher the pressure in the system, the more durable the tubular products must be, which, however, are usually less flexible and less easy to assemble. For high-pressure systems, it is possible to use pipe products with internal braiding. The higher the rigidity of tubular products, the greater their elastic memory and, therefore, the higher the likelihood of detachment from connectors, etc. The presence of braid in tubular products causes a tendency for shrinkage or pull-out at the cut ends. This action can also promote extension of the tubular product. In this case, pressing the folded back end against an abutment surface, for example, another folded end, significantly reduces the possibility of straightening the folded back end. This is particularly the case in the case of tubes with internal braiding, because compression of the braid near the end may promote extension.

For some tubing that is flexible as disclosed above, but still stiffer than standard flexible tubing while maintaining elasticity, it may be beneficial to apply a small amount of heat while bending the end of the tubing.

To enhance stability, the device also includes a sleeve 20 positioned over the back-curved end of the tube. It reduces the ability of the tube to extend. The end of the tube 2 bent back is fixed between the coupling 20 and the sleeve 12 of the holder 10.

Bending the tubes back can be accomplished using a forming device (not shown) that can bend the tube 2 back a sufficient distance over the tube holder 10. Using the same or a different forming device, the sleeve 20 can be inserted.

To reduce the likelihood of removal of the combination of holder 10 and sleeve 20, the two elements may be connected to each other. The collar 14 of the tube holder 10 is shown to be formed with a step 24 near its trailing edge 26. The sleeve 20 is formed with a projecting rim 28 near its end 29. When the tube holder 10 is positioned over the tube 2, the end of the tube is folded back over the tube holder 10 and the sleeve 20 is positioned over the back-turned end 4, the collar rim 28 will snap over the step 24 of the bead 14, locking the coupler 20 in place.

Alternative methods of securing the tube holder 10 and the coupling 20 may be used. In an example not shown, a groove may be provided in the collar 14 and a protruding ring may be provided in the coupling so that the two are aligned when the coupling is properly seated. Alternatively, also not shown, a groove may be provided on the sleeve 20 and a solid or non-solid raised ring may be provided on the holder 10.

This connection can serve as confirmation of the correct fit of the device, since the user can feel or hear how the elements, namely the collar and the ring, fit into each other. However, taking into account the forces acting on the back-curved end and the presence of the tubular product holder and coupling, this connection between the tubular product holder and the coupling is not necessary.

In FIG. 4 shows a flange connector 30 configured to connect to another flange connector. The flange connector 30 includes a grip 32 configured to fit behind (relative to the connection) the collar 14 of the tube holder 10, and a tubular section 34 connecting the grip 32 to a flange 36 extending outward from the connection.

Pairs of flanges 36 may be held together by industry standard clamps (not shown). In prior art designs, flange connectors are provided with a gasket to create a seal, but according to the present invention, a seal is created between the back-folded ends. Therefore, there is no need for a spacer if the two back-curved ends, as in FIG. 3 are used to create a connection. However, the gasket can still be used. These clamps are commonly known in the industry as "triclamp clamps" even though they are made of plastic as disclosed in EP1230505. The use of a flange connector also allows a tube with a bent-back end to be connected to another element of the production system without a bent-back end. In such a case, a gasket will not be needed, since the specified connection forms a seal.

The clamp fastens the flanges 36 to each other, which, in turn, acting through the tubular sections 34, press the grips 32 against the shoulders 14 of the tube holders 10, pressing the holders 10 of the tubular product and, thereby, the abutment surface 6 of the backward-curved ends of the tubes 2, each to each other to form a fluid-tight seal 22.

It is possible to use other types of clamping mechanism with or without flange connectors. For example, flange connectors may be secured by male connectors to corresponding female connectors, clamps, cable ties, quick connect fittings, screw threads, or other form of clamping or locking system. Alternatively, it is possible to use other clamping means specifically designed for use with tube holder 10 and coupling 20.

In the embodiment of FIG. 4 there is no connection between the holder 10 and the coupling 20. In all other respects, these elements 10, 20 are identical to those disclosed in FIG. 1-3. The specified connection can and usually will be created. Therefore, the holder 10 may be provided with a groove, or a group of projections, or a ring, and the sleeve 20 may be provided with a ring, a group of projections, or a groove.

In a further embodiment in FIG. 5, the tubular section of the flange connector 30, in particular the tubular section 34, can function as a coupling.

In FIG. 5 shows that the tube 1002 is folded back over the tube holder 1010, with the tubular holder being formed with a collar 1014 and the collar 1014 being formed with a step 1024. The sleeve 1020 is formed with a rim 1028, in use, snapped over the step 1024, as disclosed above. Most couplings include a flat top surface, such as shown in FIG. 1-4. In this case, coupling 1020 in FIG. 5 is configured as a flange connector, and its top surface 1031 is therefore configured as a flange connector 1036. This allows connection to another flange connector. The flange depth is set so that the two back-turned ends supported by the tubular product holders with the flange connector couplings are butt-joined to form a seal when the flange connectors are fastened to each other. In general, the flange will be sized and shaped to accommodate the use of an industry standard 1038 tri-clamp clamp to secure a pair of said back-curved ends supported by tubular holders and couplings with flange connectors. Alternatively, any other clamping means can be used. When using flange connectors, a gasket is usually installed between them. In the case of connecting two backward folded ends using flange connectors as disclosed above, a gasket is not required but may be present.

This arrangement also allows the backward-curved end to be connected to a flange connector, as illustrated in FIG. 4 or Fig. 5, with the tube seated on another standard flange connector, over the barbed end. In such a scheme, a gasket will be needed.

Equipping the back-bent end with a flange connector allows back-bend connections to be incorporated into industry-known standard tricamp systems and variations thereof.

Fig. 6 depicts yet another design using a flange connector, wherein the flange connector is configured to connect to an industry standard piece of equipment, such as a filter, such as those manufactured by Pall. It is also possible to connect to other filters, clamps, valves, elbows, bends, manifolds, sieves, screens and any other device with a flange connector. Tube 2002 is shown folded back over tubular holder 2010, wherein the tubular holder is formed with collar 2014 and collar 2014 is formed with step 2024. Sleeve 2020 is formed with rim 2028, when in use snapped into step 2024 as disclosed above, securing the tubular product holder 2010 and the coupling 2020 with each other. The coupling 2020 is configured as a flange connector, and its top surface 2031 is therefore configured as a flange connector 2036. The flange 2036 is shown to be configured with a raised ring 2037, which may be solid or non-solid and configured to fit into a corresponding recess in a standard piece of equipment and, thus, the connection of the flange and, accordingly, the tube with it. Flange 2036 is positioned slightly rearward from the folded back end, with a protruding ring 2037 positioned directly behind the folded back end. This allows the back-curved end 2006 to be pressed against a flat surface of standard equipment to form a seal and lock the end in place.

Some standard pieces of equipment, such as filters, are equipped with flange connectors. A flange connector typically contains a flat surface surrounding an opening leading into the equipment. The flat surface is usually surrounded by an annular groove to accommodate and secure the gasket. A connection to such a flange connector is traditionally made by attaching another flange connector to the end of the tube, usually over the barb, placing a gasket between the two flanges and securing them together using a standard tricamp clamp. Flange in Fig. 6 allows the back-curved end to be sealed against the flat surface surrounding the hole in a standard flange. The protruding ring 2037 fits into the annular groove to ensure proper placement of the folded back end. Next, you can connect the two flanges using a standard tricamp type clamp.

Fig. 7 shows a circuit very similar to that in FIG. 6, in which the back-curved end is pressed against a standard triclamp flange connector and secured by a standard triclamp, triple or double clamp, or any other design of clamp used with a standard triclamp. . Tube 3002 is shown to be folded back over a tube holder 3010, with the tube holder being formed with a bead 3014 and the bead 3014 being formed with a step 3024. The sleeve 3020 is formed with a rim 3028, when in use snapped over the step 3024 as disclosed above, securing the tubular product holder 3010 and the coupling 3020 with each other. The coupling 3020 is configured as a flange connector, and its top surface 3031 is therefore configured as a flange connector 3036. The flange 3036 is shown to be configured with a raised ring 2037, which may be solid or non-solid and configured to fit into a corresponding recess in a standard flange connector 3050. It forms a means for placing the back-turned end over the flange connector opening 3052. There is a sealed connection between the sealing end 3006 of the back-curved end and the flat surface 3054 on the front side of the flange connector. This circuit is held together with a standard 3060 tri-clamp clamp as described above. As is typical in tricamp systems, the flange connector 3050 has a barbed end 3056 over which another tube 3002' fits. This circuit allows the backward-curved end to be connected to a standard tricamp-type system.

Fig. 8 shows an alternative arrangement for connecting a back-curved tube to a standard tricamp system. In this design, the back-curved end is connected to a plug, which forms a sealing surface for it and the possibility of subsequent connection to a flange connector for use in all standard tricamp connections.

Tube 4002 is shown folded back over tubular holder 4010, with the tubular holder being formed with collar 4014 and collar 4014 being formed with step 4024. Sleeve 4020 is formed with rim 4028, when in use snapped over step 4024 as disclosed above, securing tubular product holder 4010 and coupling 4020 with each other. The 4020 coupling is in all respects the standard coupling discussed above. The folded-back end sealing surface 4006 is pressed against the free end 4050 with the through hole 4052. The free end is sized to match the size and shape of the folded-back end supported by the tube holder and coupling (eg, as disclosed with respect to 4002, 4010 and 4020). This allows the folded-back end 4006 to be secured, forming a seal, to the free end 4050 by means of a clamp designed to secure the two folded-back ends together and disclosed elsewhere herein. The free end also includes a tubular connector 4056 with a flange connector 4058, the flange connector corresponding to standard triclamp flange connectors. That is, it is designed to be connected to another such flange connector in a “triclamp” type system, i.e. using a tricamp type clamp. This scheme makes it possible to further connect the backward-curved end to a system that uses a standard “triclamp” type system.

Since connections using tri-clamp clamps are standard in the art, the fittings surrounding the folded back ends can be configured for use with tri-clamp clamps. Fig. 9 shows a pair of backward-curved ends held together with a tricamp type clamp. Each of the ends is formed with a tube 5002 supported by a tube holder 5010 and a coupling 5020. A bead 5014 on the tube holder 5010 has a step 5024 over which the rim 5028 of the coupling 5020 snaps, thereby securing these elements to each other. The design also includes a flange connector 5030 with a claw 5032 configured to fit behind the collar 5014 of the tubular product holder. Connector 5030 also includes a tubular section 5034 that fits over coupling 5020 and flange portion 5036. Flange portion 5036 is shaped to engage a tri-clamp clamp 5040 so that the tri-clamp can secure the edges of the flanges to each other, pulling the flanges together, pressing the back-curved ends together to form a 5006 seal.

Fig. 10 shows a diagram similar to that in FIG. 10, except that it allows the back-curved end to be sealed with the flange connector included in the tri-clamp system. As in the previous example, the folded-back end includes a tube 6002, the end of which is folded back and is supported by a tube holder 6010 and a coupling 6020. The collar 6014 on the tube holder 6010 is formed with a step 6024, on top of which the rim 6028 of the coupling 6020 is secured, thereby securing these elements together. together. The design also includes a flange connector 6030 with a jaw 6032 designed to fit behind the collar 6014 of the tubular product holder. Connector 6030 is also configured with a tubular section 6034 to fit over coupling 6020 and flange portion 6036. Flange portion 6036 is shaped to engage with tri-clamp clamp 6040 such that, when attached, the tri-clamp clamp will pull the flange toward to another flange in the clamp. The flange portion 6036 also includes a collar 6037 to provide a gap to the standard tricamp flange connector 6070. Flange connector 6070 includes a flanged end 6072 connected to a tubular section 6074 with a barbed end 6076 over which a second tube 6002' is seated. The design, size and shape of the 6030 flange connector allows the 6006 flange end to be pressed against the 6072 flange end on a standard triclamp system where it is sealed by the triclamp clamp that holds the 6030 flange connectors together. 6070.

An important feature of the invention is that although the connection system can be used to connect two tubes of the same diameter, it is also designed to connect two tubes of different diameters. This is achieved by using structures in the form of protrusions, bulges or conical parts at the distal end 16 of the sleeve 12 of the tube holder 10 or by using a sleeve thickened along the entire length.

When connecting two different sized tubes, it is common to increase the diameter of the smaller tube around the tubular holder, for example by protruding, bulging, tapering or thickening the sleeve. The result is an enlarged or widened back-curved end and thereby increases the size of the sealing surface or abutment surface 6. This ensures contact and sealing between the abutment surface 6 of the smaller diameter tube and the abutment surface 6 of the larger diameter tube. In this case, it is also possible to use similar structures to reduce the diameter of the abutment surface on a larger diameter tube for connection with a smaller diameter tube.

If it is necessary to connect with a tube of a smaller diameter, the inner side of the bushing is made with a protrusion, convexity or expanding taper 40. If it is necessary to connect with a tube of a larger diameter, a protrusion, convexity, expanding taper or thickened end 40 is made on the outer side of the bushing or a bushing is used, thickened along its entire length.

The use of a protrusion, convexity or taper on one bushing makes it possible to increase the size of the abutment surface 6 by inclusive, but usually by 1/16'' or preferably by 1/8''.

The combination of two bushings, one of which is made with a projection, convex or 40 taper for connection with a larger diameter tube, and the other with a projection, convex or 40 taper for connection with a smaller diameter tube, provides the ability to connect tubes with a difference in diameter while maintaining sufficient overlap of the abutment surfaces 6 to be joined end-to-end to form a fluid-tight seal 22. In general, the diameter of the folded-back portion on the smaller diameter tube will be increased to connect to the folded-back portion on the larger diameter tube.

Fig. 11 shows a tube holder 10 sized for use with a tube with a diameter of, for example, 1/4'' (6.35 mm), wherein the tubular holder is configured with a thickening 40 of the sleeve 12 for connection with another tube of a larger diameter, for example 3/ 8'' (9.525 mm). The amount of possible expansion or contraction of the tubular product depends on the flexibility of the tubular product and the overlap that the thickening 40 can create. Typically, expansion or contraction of approximately 1/8" (3.175 mm) per tubular holder can be easily achieved. At the same time, in some cases an expansion by (6.35 mm) or 1/16'' (1.5875 mm). When connecting two tubes end to end, one may have a tube holder 10 for expansion, and the other a tube holder 10 for contraction. Typically a difference can be achieved (6.35 mm). In this case, in some cases a difference can be achieved (12.7 mm) or 1/8'' (3.175 mm). The presence of the projection 40 increases the size of the abutment surface 6 to provide overlap with the abutment surface formed by the larger tube.

Likewise, FIG. 12 shows a tube holder 10 sized to accommodate a tube with a diameter of e.g. (19.05 mm) and containing a tapered sleeve forming a thickened end 40 for connection with another tube of a smaller diameter, for example, 5/8'' (15.875 mm), while the taper is also 1/8'' (3.175 mm). The protrusion increases the size of the abutment surface 6 formed by the back-curved end to provide overlap with the abutment surface formed by the smaller tube.

In FIG. 11 and 12, the connections between the holder 10 and the coupling 20 are not shown, but any of the connection methods discussed above can be used.

Fig. 13 shows a tube 102 with diameter (a), for example (19.05 mm) connected to a tube 202 with diameter (b), for example (12.7 mm). Thus, tubes with a diameter difference of 1/4" (6.35 mm) are connected through tubular product holders 110, 210, similar to those disclosed above in the examples of FIGS. 7 and 8. In this embodiment, the tubular holder 110 is configured with a tapered sleeve 112. The tubular holder 210 is a standard tubular holder as in FIG. 1-3, not expanding or contracting in any way the diameter of the tubular article 202. That is, FIG. 9 depicts a connection between a larger diameter tubular piece (a) and a smaller diameter tubular piece (b), where the tubular piece (a) is narrowed in diameter and the tubular piece (b) is left unchanged. Alternatively, tubular holder 110 may be configured with protrusions or protrusions at its distal end, and tubular holder 210 may be tapered extending outward from the center of the tube, or convex or protruding at its distal end.

The tubular holder 110 that supports the tube 102 is provided with a sleeve 112 with a taper 140 that increases the abutment surface 106 in an inward direction relative to the center of the tube 102.

Thus, despite the difference in diameters (a) and (b) of the tubes 102 and 202, it is possible to form a seal 122 between the abutment surfaces 106, 206.

It can be seen that by increasing the size of the abutment surfaces 6, formed by bending the ends of the tubes over the corresponding sleeves 2, the abutment surfaces can still form a seal 26 between themselves despite the difference in tube diameters, e.g. (6.35 mm).

The possibility of connections between tubular products of other different sizes is also provided.

Fig. 14 depicts a connection between a first tube 1102 of one diameter, in this example 1'', and a second tube 1202 of a different diameter, in this case 1''. The difference in diameters of these tubes, amounting to can be compensated for by the disclosed modifications to the tube holder and represents an approximate limit of expansion that can be easily achieved.

The tube 1102 is provided with a tubular holder 1110 with a standard or somewhat narrow sleeve 1112 and a standard collar 1114. In contrast, the tube 1202 is provided with a significantly thicker tubular holder 1210. In particular, the sleeve 1212 is thickened along its length and is formed with a smooth taper towards its distal end 1216, around which the tube 1202 is folded back. the first tube 1102 around the distal end 1116 of the sleeve 1112.

The tube 1102 is also provided with a standard size coupling 1120. It is connected to the collar 1114 of the tubular product holder 1110, securing the two elements together.

The tube 1202 is also provided with a coupling 1220, however this coupling is thicker than the standard coupling. Accordingly, bead 1214 is longer than standard beads. This allows for abutment and connection between the sleeve 1120 and the collar 1214, as discussed above.

It can be understood that the thickening of the sleeve 1210 and coupling 1220 serves two purposes. First, it allows for a butt connection between the folded back end 1204 of a smaller diameter tube and the folded back end 1104 of a larger diameter tube, using a standard size tube holder 1110 and coupling 1120 to fold the larger diameter tube back and support it, i.e. . without thickening. Thus, thickening the bushing 1212 allows the bend radius of the end of the tube 1202 to increase, and thereby increase the diameter of the abutment surface, relative to what would occur if it were folded back directly onto itself or a standard size bushing was used. Second, by thickening the sleeve 1212 and coupling 1220, the outer surfaces of both couplings 1120 and 1220 can have the same diameter when joined end-to-end. This makes it easier to attach pairs of tubular holders and couplings to each other to form a seal between the two tubes.

In FIG. 15 shows that to provide stability to the folded-back portion in cases where the tube 302 is made of certain materials, such as PVC, an additional shock absorber 330 is preferably provided between the sleeve 312 of the tubular product holder 310 and the tube 302. It has been found to improve stability. when using such tubes.

It is shown that there is no connection between the holder 310 and the coupling 320. This optional element is possible, but not required.

Consider Fig. 16: The connection system with the back-curved end of a flexible tube can be used in systems formed on the basis of a semi-flexible or rigid tubular product, for example, made of PVC (certain compositions). In such cases, flexible tubing 402, for example made of silicone, may be inserted into semi-flexible or rigid tubing 450. To create a sealing surface, the end of flexible tubing 402 is folded back onto itself and the semi-flexible or rigid tubing. The folded back end is supported by a tubular product holder 410 similar to that disclosed in the previous embodiments. In this case, the tubular product holder is shown with a shortened sleeve 412. It is also possible to use a standard length sleeve. The tubular product holder is made with projections 452 with the possibility of alignment with grooves 454 in a semi-flexible or rigid tube. The alignment of the projections 452 and the grooves 454 operates to lock the tubular product holder 410 in place.

As in previous embodiments, the coupling 420 secures the flexible tube 402 in a backward-bent position. The coupling 420 is shown to be attached to the tubular holder 410 by means of a protrusion 426 on the coupling aligned with a groove 424 in the tubular holder. This connection between holder 410 and coupling 420 is optional. It provides additional fastening of the elements to each other and a “click” fit, confirming to the user that the device is seated correctly. However, this connection is optional and will be absent in many embodiments.

As in previous embodiments, the folded back end of the flexible tube 402 defines a sealing surface 406 that can be butt-jointed with another sealing surface to form a sealed connection. One of the advantages of this system is that the semi-flexible or rigid tubing can be made of a lower grade of material since the fluid will flow through the silicone tubing supported within the semi-flexible or rigid tubing.

Fig. 17 depicts a further alternative design for a back-curved flexible tubing connection system in systems formed from semi-flexible or rigid tubular product. As in the embodiment in FIG. 12, flexible tubing 4102 is inserted into semi-flexible or rigid tubing 450. To create a sealing surface, the end of flexible tubing 402 is folded back onto itself and the semi-flexible or rigid tubing.

The folded back end 4106 is supported by a tubular product holder 4110, which has many similarities to the holders of previous embodiments. Here, the tubular product holder is depicted with a sleeve 412 including an inwardly facing protrusion 4115 that forms an abutment for the end of the semi-flexible or rigid tubing 4150.

This embodiment does not have any protrusions on the underside of the bushing present in the embodiment of FIG. 16, as well as the corresponding grooves in the semi-flexible or rigid tube. Such projections and grooves may be present, but are generally not required.

As in previous embodiments, the coupling 4120 secures the flexible tube 4102 in a backward-bent position. The coupling 4120 is shown to be attached to the tubular product holder 4110 by means of a collar 4128 contained on the coupling 4120 snapped over a step 4124 onto a collar 4114 on the tubular product holder 4110. This is disclosed in the embodiment of FIG. 1. It is also possible to use other methods of connecting the coupling 4120 to the tubular product holder 4110, disclosed in other embodiments.

As in previous embodiments, the folded back end of the flexible tube 4102 defines a sealing surface 4106 that can be butt-jointed with another sealing surface to form a sealed connection. One of the advantages of this system is that the semi-flexible or rigid tubing can be made of a lower grade of material since the fluid will flow through the silicone tubing supported within the semi-flexible or rigid tubing.

Fig. 18 depicts an additional embodiment in which a back-curved flexible tubing connection system is used in systems formed from semi-flexible or rigid tubular product.

This embodiment is similar in many ways to that disclosed in FIG. 17, except that the tubular product holder is not configured with an inward facing projection and therefore does not include a stop for semi-flexible or rigid tubing.

Flexible tubing 4202, for example made of silicone, is shown to be inserted into semi-flexible or rigid tubing 4250. To create a sealing surface, the end of flexible tubing 4202 is folded back onto itself and the semi-flexible or rigid tubing. The folded-back end is supported by a tubular holder 4210, much like those disclosed in previous embodiments, with a sleeve 4212 and a collar 4214. The flexible tube 4202 is folded back over the semi-flexible or rigid tube 4250 and the tubular holder 4210.

As in previous embodiments, the coupling 4220 secures the flexible tube 4202 in a backward-bent position. The coupling 4220 is shown to be attached to the tubular product holder 4210 via mating screw threads: a screw thread 4224 on the coupling 4220 and a mating screw thread 4228 on the collar of the tubular product holder 421.

As in previous embodiments, the folded back end of the flexible tube 4202 defines a sealing surface 4206 that can be butt-jointed with another sealing surface to form a sealed connection.

As stated above, the apparatus and method of the present invention may find application in constructing a disposable biodegradable system, such as batch production systems, semi-permanent systems, pilot or test systems.

Such systems usually contain a valve, which can be implemented using the proposed device.

The semi-flexible or rigid tubular product in FIG. 16-18 may be made of PVC, for example, some compositions with insufficient flexibility and elasticity to form a seal, may be plastic tubing with internal braiding, or even metal tubing.

Fig. 19 shows a valve using the device disclosed above. Valve 500 includes a portion of tubular product 502, each end 504 of which is bent back using the device disclosed above. That is, each tube end 504 is folded back over a tubular product holder 510 including a sleeve 512 and a collar 514. Each tube end 504 is folded back is supported by a sleeve 520.

The tubular product holder 510 and the coupling 520 are connected, as disclosed in FIG. 1. The collar 514 of the tube holder 10 is shown to be formed with a recess 524 near its trailing edge 526. The sleeve 520 is formed with a protruding rim 528 near its end 529. When the tubular product holder 510 is positioned over the tube 502, the end of the tube is folded back over the tube holder 510 , and the coupling 520 is positioned over the folded back end 504, the coupling rim 528 will snap over the step 524 of the bead 514, locking the coupling 520 in place.

A clamp 550 is located between the back-curved ends 504 of the tube 502. The clamp may be any type of clamp capable of compressing the tube so that there is no flow along the tube 502 and incrementally limiting the flow along the tube.

The clamp is shown to be configured with a seat 552 on which the tube 502 rests, two vertical members 554 extending from each end of the seat 552, and a compression member 556 movable up and down relative to the vertical members 554 to which it is connected. The clamp also includes a top member 558 rigidly coupled to the tops of the vertical members 554. The clip also includes a screw member 560 coupled to a compression member 556. Along its length, the screw member 560 is formed with a screw thread 562, a mating screw thread in a hole 564 in the top member 558, and with a handle 566 for rotating the screw element 560.

Tube 502 is located in seat 552 and between vertical members 554 and compression member 556. When handle 566 is rotated, compression member 556 moves downward along vertical members 554 toward the seat. As it moves, it restricts the internal volume of the tube 502 and thereby restricts the flow. As the handle continues to rotate, restriction member 556 forces tube 502 against seat 552, pressing opposite sides of the tube together and completely blocking any flow along the tube. Since tube 502 is a flexible tube, it will take the form of a seat and compression member designed to fully compress the tube. Likewise, when the handle is rotated in the other direction, the compression element rises from the seat, allowing flow to flow through the tube. Such clamps are well known, but other types of clamps are also possible.

In many cases, disposable biodegradable systems must contain an end cap, which can also be made using the proposed device. In the end cap 601 in FIG. 20 utilizes the system of tubular product holder 610 and coupling 602 disclosed in previous embodiments. It provides connectivity between two folded-back ends or two sets of holders that support the folded-back ends.

End cap 601 is shown to include a tubular product holder 610 and a sleeve 620 holding a sheet of flexible material 602. That is, the sheet 602 is secured between the tubular product holder and the sleeve 620, as disclosed above. This allows the holder and coupling combination to be connected to another holder and coupling combination as disclosed above. This pattern also forms a closed sealing end 606.

The tubular product holder 610 is provided with a plug 650. The plug 650 may be configured separately from the tubular product holder 610, but is sized to fit tightly therein to form a closed structure. Alternatively, plug 650 may be molded into tubular product holder 610 during manufacturing. Plug 650 includes an end 652 sized to fit into a tubular product holder 610 and another end 654 shaped like a handle. The handle is configured to install the plug in a specific position (if it is configured separately from the tubular product holder 610) and to manipulate the end plug 601 as a whole.

Although plug 650 is depicted as being shaped to be grasped by fingers, including seat end 652 and handle end 655, the shape of handle end 655 may vary. For example, the handle may be an extension of the seat end 565 with parallel sides.

Such an end cap is configured to seal the end of the tube or connection.

These connections between tubes can be used in many situations. The ability to seal the tube by butting the seal further formed by its end reduces the number of materials that any fluid passing through the tube must come into contact with, thereby reducing the risk of contamination and the number of no-flow areas that reduce throughput. tubes and in which contaminants may accumulate.

Claims (29)

1. A device for forming a sealing end from a section of a flexible tubular product, comprising a tubular product holder with a sleeve sized to fit onto the flexible tubular product, and a coupling sized to fix the end of the flexible tube bent back over the tube holder, wherein the coupling and the tubular product holder are configured to engage with each other. 2. The device of claim 1, wherein the sized sleeve is configured to transitionally fit over the flexible tubular article, and the sized coupling is configured to tightly fit over the end of the flexible tube folded back over the tube holder. 3. The device according to claim 1, in which the sleeve is sized to fit freely over the flexible tubular product. 4. Device according to any one of paragraphs. 1-3, wherein the tubular product holder further includes a collar extending substantially perpendicular to the sleeve. 5. Device according to any one of paragraphs. 1-3, wherein the coupling further includes a collar extending substantially perpendicular to the coupling. 6. Device according to any one of paragraphs. 1-3, wherein both the tubular product holder and the coupling are provided with beads that, in use, extend substantially perpendicular to the sleeve and coupling and toward each other. 7. The device according to claim 6, in which the shoulder of the tubular product holder is made with a step, and the collar of the coupling is made in the form of a rim, wherein the step and the rim provide the possibility of connection between the tubular product holder and the coupling. 8. The device according to claim 4, in which the collar is made with a groove, and the coupling is made with one or more protrusions, sized to be aligned with the groove, with the correct placement of the tubular product holder and the coupling connecting them to each other. 9. The device according to claim 4, in which the collar is made with one or more protrusions, and the coupling is made with a groove sized to fit over the protrusions, with the correct placement of the tubular product holder and the coupling connecting them to each other. 10. The device according to any of the previous paragraphs, in which the sleeve includes a distal end configured to be butt-connected to a tubular product of a smaller diameter. 11. Device according to any one of paragraphs. 1-9, in which the sleeve includes a distal end configured to be butt-connected to a tubular product of a larger diameter. 12. The device according to claim 11, in which the sleeve is thickened along its length, which increases the possible radius of bending the tube back. 13. The device according to claim 12, in which the thickened sleeve is conical and rounded. 14. A device as claimed in any one of the preceding claims, wherein the outer surface of the sleeve includes a group of projections or barbs for securing the backward-curved end of the tube. 15. The device according to any of the previous paragraphs, in which the device is made of thermoplastic. 16. The device according to claim 15, wherein the device is made of polyvinylidene difluoride (PVDF). 17. A device for forming a sealing end from a section of a flexible tubular product, comprising a tubular product holder with a sleeve sized to allow a transitional fit over the flexible tubular product, and a collar extending substantially perpendicular to the sleeve, and a coupling sized to fit onto the end of the flexible tubing, bent back over the tube holder. 18. The device according to any of the previous paragraphs, in which the coupling forms a flange connector. 19. The device according to any one of paragraphs. 1-16 or 17, in which the coupling forms a butt connector with a flanged end. 20. The apparatus of claim 19, wherein the flanged end comprises a structure for alignment with a corresponding structure at the butt joint. 21. The device according to claim 4 or 17, further comprising a flange connector with a grip sized to engage with the shoulder of the tubular product holder, a tubular section structurally configured to run parallel to the specified section of the tubular product when in use, and a flange sized configured to be secured to another flange of another flange connector. 22. A method for connecting two sections of a flexible tube, including the steps of: bending the end of each section of the tubular product back onto it, supporting each bent back end using the device according to any one of claims. 1-16 or 17 and press the back-curved ends together to form a fluid-tight joint. 23. The method according to claim 22, in which the fluid-tight connection is fixed using a device according to any one of claims. 18, 19 or 21. 24. A method for forming a sealing end from a section of a flexible tubular product, including the steps of: sliding the tubular product holder according to any one of claims. 4-16 or 17 to the end of the tube so that the collar is located at the greatest distance from the end of the tube, and the sleeve is located at a short distance from the end of the tube, bend the end of the tube back over the sleeve, while the section of the tube bent back does not pass beyond the shoulder or by the end of the sleeve, slide the coupling according to any of paragraphs. 1-16 or 17 over the back-curved end and connect the tubular holder and coupling. 25. The method of forming a fluid-tight seal from two sealing ends according to claim 24, wherein the two back-curved ends are secured to each other to form a fluid-tight seal. 26. The method according to claim 25, in which the backward-curved ends are secured to each other by using a device according to any one of claims. 18, 19 or 21 to form a fluid-tight seal. 27. A method of connecting two sections of a flexible tube, including the steps of: bending the end of each section of the tubular product back onto it; The back-curved ends create a fluid-tight connection. 28. The method of connecting two sections of a flexible tubular product according to claim 27, in which the back-curved ends are supported by a device according to any one of claims. 1-16 or 17.

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