CONNECTOR AND METHOD FOR CONNECTING PIPES FOR TRANSPORTING FLUIDS

Abstract

A connector for connecting pipes for transporting fluids has a tubular casing, which extends around a main axis; an end insert, which can be snap coupled to one end of the tubular casing; a tubular sleeve, which is configured to be fitted around a respective fluid transport pipe and to cooperate with the end insert such that a relative rotation around the main axis of the tubular sleeve within the end insert results in a relative displacement of the tubular sleeve with respect to the end insert in a direction substantially parallel to the main axis; and a clamping element, which is housed within the tubular casing and is configured to retain the respective transport pipe.

Claims

1. A connector for connecting pipes for transporting fluids; the connector (1) comprising: a tubular casing (3), which extends around a main axis (A); an end insert (4), which can be snap coupled to one end (7) of the tubular casing (3); a tubular sleeve (5), which is configured to be fitted around a respective fluid transport pipe (2) and to cooperate with the end insert (4) such that a relative rotation around the main axis (A) of the tubular sleeve (5) within the end insert (4) results in a relative displacement of the tubular sleeve (5) with respect to the end insert (4) in a direction substantially parallel to the main axis (A); and a clamping element (6), which is housed within the tubular casing (3) and is configured to retain the respective transport pipe (2).

2. The connector as claimed in claim 1, wherein the tubular sleeve (5) comprises at least one pin (22); the end insert (4) being provided with at least one internal seat (25), which is shaped to house a respective pin (22) of the tubular sleeve (5) and to guide said pin (22) along a segment of a helical trajectory, which develops around the main axis (A).

3. The connector as claimed in claim 2, wherein the at least one internal seat (25) is shaped so as to allow a relative displacement of the respective pin (22) of the tubular sleeve (5) with respect to the end insert (4) in a direction substantially parallel to the main axis (A).

4. The connector as claimed in claim 2, wherein the tubular sleeve (5) comprises two pins (22) and the end insert (4) is provided with two respective internal seats (25).

5. The connector as claimed in claim 1, wherein the clamping element (6) comprises a toothed washer (12).

6. The connector as claimed in claim 1, and comprising an annular sealing element (14), preferably made of a polymeric material, which is housed within the tubular casing (3) at a distance from the clamping element (6) and is configured to interfere with the fluid transport pipe (2).

7. The connector as claimed in claim 1, and comprising an annular spacer (11), which is placed on an inner shoulder (9) of the tubular casing (3) and is shaped to support the clamping element (6).

8. The connector as claimed in claim 1, wherein the tubular sleeve (5) is provided at one end with a collar (23) shaped so as to allow a fastening tool to be gripped thereon.

9. The connector as claimed in claim 1, wherein the tubular casing (3) comprises a plurality of engaging elements (15), each of which is placed on the outer surface of the tubular casing (3) and is provided with a chamfered portion (16); the end insert (4) comprising a coupling portion (18) provided with a plurality of openings (19), each of which is configured to house a respective engaging element (15) of the tubular casing (3).

10. The connector as claimed in claim 1, wherein the tubular casing (3), the end insert (4) and the tubular sleeve (5) are preferably made of respective polymeric materials.

11. A connector for connecting pipes for transporting fluids; the connector (27) comprising: a tubular casing (28), which extends around a main axis (A); an end insert (29), which can be snap coupled to one end of the tubular casing (28) and comprises an upper wall (30) provided with at least one pin (31); and a tubular sleeve (32), which is configured to be fitted around a respective fluid transport pipe (2) and to cooperate with the end insert (29) so as to be snap engaged/disengaged to the end insert (29) by a force exerted on the tubular sleeve (32) in a direction substantially parallel to the main axis (A); the tubular sleeve (32) comprising at one end a collar (33) provided with at least one opening (34), which is shaped to receive the respective pin (31) during a displacement of the tubular sleeve (32) towards the end insert (29) in a direction substantially parallel to the main axis (A).

12. The connector as claimed in claim 11, wherein the end insert (29) comprises four pins (31), uniformly distributed on the upper wall (30) around the main axis (A); the collar (33) being provided with four openings (34) uniformly distributed around the main axis (A).

13. The connector as claimed in claim 11, wherein each pin (31) extends from the upper wall (30) along a direction substantially parallel to the main axis (A).

14. The connector as claimed in claim 11, wherein the end insert (29) comprises an inner surface (35) provided with an inner shoulder (36); the tubular sleeve (32) comprising an engaging portion (37), which is configured to interfere with the inner shoulder (36) so as to snap engage/disengage with the end insert (29).

15. A method for connecting pipes for transporting fluids; the method comprising the steps of: snap coupling an end insert (4) to an end (7) of a tubular casing (3), which extends around a main axis (A); fitting a tubular sleeve (5) around a respective fluid transport pipe (2); rotating around the main axis (A) the tubular sleeve (5) within the end insert (4) so as to cause a relative displacement of the tubular sleeve (5) with respect to the end insert (4) in a direction substantially parallel to the main axis (A); and retaining the tubular sleeve (5) within the tubular casing (3).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Further characteristics and advantages of the present invention will be apparent from the following description of non-limiting example embodiments, with reference to the accompanying figures, wherein:

[0051] FIG. 1 is a perspective view, with parts removed for clarity, of a connector for connecting pipes for transporting fluids manufactured in accordance with the present invention;

[0052] FIGS. 2 and 3 are sectional views, with parts removed for clarity, of the connector of FIG. 1 in respective operational configurations;

[0053] FIG. 4 is a perspective view of a tubular sleeve of the connector of FIG. 1;

[0054] FIG. 5 is a perspective view of an end insert of the connector of FIG. 1;

[0055] FIG. 6 is a perspective view, with parts removed for clarity, of a connector for connecting pipes for transporting fluids manufactured in accordance with a further embodiment of the present invention; and

[0056] FIG. 7 is a sectional view, with parts removed for clarity, of the connector of FIG. 6.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

[0057] With reference to FIGS. 1-3, reference numeral 1 indicates, as a whole, a connector for connecting ends of two fluid transport pipes 2 (FIG. 3). The connector 1 can also be used for connecting one end of a transport pipe 2 (FIG. 3) to a further hydraulic element, such as for example a pump or a valve or a tank.

[0058] The connector 1 is particularly applicable to hydraulic circuits of household electrical appliances, such as for example ovens, steam machines and coffee machines, without thereby limiting the wide range of possible applications of the present invention.

[0059] The connector 1 comprises a tubular casing 3, which extends around a main axis A; an end insert 4, which can be snap coupled to one end of the tubular casing 3; a tubular sleeve 5, which is configured to be fitted around a respective fluid transport pipe 2 (FIG. 3) and to cooperate with the end insert 4 such that a relative rotation around the main axis A of the tubular sleeve 5 within the end insert 4 results in a relative displacement of the tubular sleeve 5 with respect to the end insert 4 in a direction substantially parallel to the main axis A; and a clamping element 6 (FIGS. 2 and 3), which is housed within the tubular casing 3 and is configured to retain the respective transport pipe 2.

[0060] In particular, the tubular casing 3, the end insert 4 and the tubular sleeve 5 are made of respective polymeric materials.

[0061] With reference to FIGS. 2 and 3, the tubular casing comprises an end 7; an inner shoulder 8; an inner shoulder 9 placed between the end 7 and the inner shoulder 8 at a distance from the inner shoulder 8 along the main axis A; and a narrowing 10 configured to provide an abutment surface for one end of each transport pipe 2 (FIG. 3) so as to clamp the sliding of each transport pipe 2 (FIG. 3) in a direction substantially parallel to the main axis A when said transport pipe 2 (FIG. 3) is inserted within of the tubular casing 3.

[0062] The connector 1 comprises an annular spacer 11, which is placed on the inner shoulder 9 and is shaped to support the clamping element 6.

[0063] In particular, the clamping element 6 comprises a toothed washer 12 provided with a plurality of flexible teeth 13 facing each other. Practically, each flexible tooth 13 is configured to deflect when said flexible tooth 13 enters into contact with the tubular sleeve 5 during the insertion of the tubular sleeve 5 within the tubular casing 3.

[0064] Furthermore, the connector 1 comprises an annular sealing element 14, preferably made of a polymeric material, which is housed within the tubular casing 3 at a distance from the clamping element 6 and is configured to interfere with the fluid transport pipe 2 (FIG. 3).

[0065] In particular, the annular sealing element 14 is an O-ring. The term “O-ring” means a rubber ring used as mechanical gasket. The O-rings are designed to be inserted in suitable housings and to be compressed during the assembly of two or more parts, thus creating a sealing gasket.

[0066] More specifically, the annular sealing element 14 is supported by the inner shoulder 8. In this manner, the annular sealing element 14 is placed at such a distance from the clamping element 6 to allow the deflection of each flexible tooth 13 without said flexible tooth 13 entering into contact with the annular sealing element 14 during the insertion of the tubular sleeve 5 within the tubular casing 3.

[0067] With reference to FIG. 1, the tubular casing 3 comprises a plurality of engaging elements 15, each of which is placed on the outer surface of the tubular casing 3 at the end 7 and is provided with a chamfered portion 16. More specifically, the tubular casing 3 comprises four engaging elements 15 uniformly distributed on the outer surface of the tubular casing 3 and a seat 17 obtained in the outer surface of the tubular casing 3 and placed around the engaging elements 15.

[0068] The end insert 4 comprises a coupling portion 18 provided with a plurality of openings 19, each of which is configured to house a respective engaging element 15 of the tubular casing 3. In particular, the coupling portion 18 is ring-shaped and is configured to be housed within the seat 17 by means of a snap coupling.

[0069] Furthermore, the end insert 4 comprises an upper wall 20, which is substantially flat and is configured to provide an abutment surface for the tubular sleeve 5 so as to clamp the sliding of the tubular sleeve 5 in a direction substantially parallel to the main axis A when the tubular sleeve 5 is inserted within the tubular casing 3.

[0070] In the non-limiting case of the present invention described and illustrated herein, the tubular casing 3 extends symmetrically with respect to a symmetry plane P perpendicular to the main axis A and intersecting the narrowing 10. In accordance with such configuration, the connector 1 comprises a pair of end inserts 4, a pair of tubular sleeves 5, a pair of clamping elements 6, a pair of annular spacers 11 and a pair of annular sealing elements 14.

[0071] In accordance with a further embodiment, not shown in the accompanying figures, the narrowing 10 is placed in the proximity of one end of the tubular casing 3 along the main axis A.

[0072] With reference to FIG. 4, the tubular sleeve 5 comprises a tubular portion 21; two pins 22, each of which is placed on the outer surface of the tubular portion 21; and a collar 23 shaped to allow the fastening tool to be gripped thereon, not shown in the accompanying figures.

[0073] The tubular portion 21 is provided with two notches 24 configured to favour the deformation of the tubular portion 21 during the insertion of the tubular sleeve 5 within the tubular casing 3.

[0074] With reference to FIG. 5, the end insert 4 is provided with two internal seats 25, each of which is obtained in a cylindrical inner wall 26 of the end insert 4.

[0075] Each internal seat 25 is shaped to house a respective pin 22 of the tubular sleeve 5 and to guide said pin 22 along a segment of a helical trajectory, which develops around the main axis A.

[0076] In particular, the segment of helical trajectory defined by each internal seat 25 is shaped to cause a displacement of the tubular sleeve 5 of the order of a few millimetres in a direction substantially parallel to the main axis A.

[0077] Furthermore, each internal seat 25 is shaped to allow the relative displacement of the respective pin 22 of the tubular sleeve 5 with respect to the end insert 4 in a direction substantially parallel to the main axis A.

[0078] With reference to FIGS. 6 and 7, a connector 27 for connecting fluid transport pipes 2 (FIG. 3) is shown manufactured in accordance with a further embodiment of the present invention.

[0079] The connector 27 comprises a tubular casing 28, which extends around a main axis A; an end insert 29, which can be snap coupled to one end of the tubular casing 28 and comprises an upper wall 30 provided with at least one pin 31; a tubular sleeve 32, which is configured to be fitted around a respective fluid transport pipe 2 (FIG. 3) and to cooperate with the end insert 29 so as to be snap engaged/disengaged to the end insert 29 by means of a force exerted on the tubular sleeve 32 in a direction substantially parallel to the main axis A.

[0080] The tubular sleeve 32 comprises at one end a collar 33 provided with at least one opening 34, which is shaped to receive the respective pin 31 during the displacement of the tubular sleeve 32 towards the end insert 29 in a direction substantially parallel to the main axis A.

[0081] In particular, the end insert 29 comprises four pins 31, uniformly distributed on the upper wall 30 around the main axis A. The collar 33 is provided with four openings 34 uniformly distributed around the main axis A.

[0082] More specifically, each pin 31 extends from the upper wall 30 along a direction substantially parallel to the main axis A.

[0083] With reference to FIG. 7, the end insert 29 comprises an inner surface 35 provided with an inner shoulder 36. The tubular sleeve 32 comprises at one end a engaging portion 37, which is provided with a step 38 and is configured to interfere with the inner shoulder 36 so as to snap engage/disengage with the end insert 29.

[0084] Similarly to the connector 1 shown in FIGS. 1-3, the connector 27 comprises the clamping element 6, which is housed within the tubular casing 28 and is configured to retain the fluid transport pipe 2 (FIG. 3); the annular spacer 11, which is shaped to support the clamping element 6; and the annular sealing element 14, preferably made of a polymeric material, which is configured to interfere with the fluid transport pipe 2 (FIG. 3).

[0085] In use and with reference to FIG. 2, the tubular sleeve 5 is inserted in the end insert 4 in a first position, in which each pin 22 is housed in the respective internal seat 25 and the collar 23 is positioned at a distance from the upper wall 20 of the end insert 4.

[0086] With reference to FIG. 3, a fluid transport pipe 2 is inserted within the tubular casing 3 passing through the tubular sleeve 5, the clamping element 6 and the annular sealing element 14 such that the end of the fluid transport pipe 2 enters into contact with the narrowing 10.

[0087] Subsequently, the tubular sleeve 5 is rotated with respect to the end insert 4 around the main axis A, causing the displacement along the main axis A of the tubular sleeve 5 up to a second position, in which the tubular sleeve 5 is clamped within the end insert 4 and the collar 23 is in abutment against the upper wall 20.

[0088] More specifically, the rotation of the tubular sleeve 5 around the main axis A causes the sliding of each pin 22 in the respective internal seat 25, which guides the respective pin 22 along a segment of a helical trajectory causing the displacement of the tubular sleeve 5 between the first and the second positions.

[0089] The rotation of the tubular sleeve 5 can be carried out by means of a fastening tool, not shown in the accompanying figures.

[0090] In the displacement of the tubular sleeve 5 from the first to the second positions, the tubular portion 21 of the tubular sleeve 5 enters into contact with said flexible teeth 13 of the toothed washer 12, causing the deflection of the flexible teeth 13 and the deformation of the tubular portion 21, and consequently clamping the tubular sleeve 5 within the tubular casing 3. In this manner, the fluid transport pipe 2 is compressed within the tubular portion 21 of the tubular sleeve 5, clamping the sliding of the fluid transport pipe 2 in a direction substantially parallel to the main axis A.

[0091] In accordance with an alternative mode of inserting the tubular sleeve 5 within the end insert 4, the collar 23 of the tubular sleeve 5 is pushed by pressure towards the upper wall 20 of the end insert 4 in a direction substantially parallel to the main axis A. In such circumstance, the tubular sleeve 5 slides in a direction substantially parallel to the main axis A, without requiring a relative rotation of the tubular sleeve 5 with respect to the end insert 4 around the main axis A.

[0092] More specifically, the insertion of the tubular sleeve 5 within the end insert 4 causes the sliding in a direction substantially parallel to the main axis A of each pin 22 in the respective internal seat 25.

[0093] It is finally evident that variations can be made to the present invention with respect to the described embodiments without thereby departing from the scope of protection of the appended claims.