Suction device for a textile machine, textile machine with a suction device, use of two cyclone elements, and method for suctioning yarns

Abstract

A suction device (100) for a textile machine comprising a mouthpiece (2) for introducing at least one yarn, a suction pipe (3) for guiding the yarn and a suction element (5) for generating a suction pressure. The suction element (5) comprises at least two cyclone elements (1a, 1b) for generating a vortex flow of compressed air. The cyclone elements (1a, 1b) are arranged one behind the other in the suction direction (A), so that a yarn can be passed first through a first cyclone element (1a) and then through a second cyclone element (1b). Each cyclone element (1a, 1b) comprises a cyclone axis, the cyclone axes being aligned in particular coaxially. Each cyclone element (1a, 1b) comprises at least one opening (31a, 31b) at the periphery, which is connected to a preferably common air delivery system (12), in particular in such a way that vortexes in both cyclone elements (1a, 1b) have the same direction of rotation. The suction device (100) comprises in particular a Laval nozzle (13).

Claims

1. A suction device for a textile machine, wherein the suction device comprises two cyclone elements for generating a vortex flow of compressed air arranged one behind the other in a suction direction, so that the yarn can be guided through a first cyclone element and then through a second cyclone element, wherein each cyclone element comprises a cyclone axis and the cyclone axes are aligned coaxially, a suction pipe for guiding the yarn and a suction element for generating a suction pressure, a mouthpiece for introducing at least one yarn, the mouthpiece comprising at least one opening on a circumference of the mouthpiece on an inner side of the mouthpiece, and an air delivery system constructed and arranged such that the air delivery system serves as an air supply to the mouthpiece and at least one of the cyclone elements, wherein air flow can be introduced into the mouthpiece through the at least one opening, wherein the at least one opening is aligned in the suction direction so that the air flow introduced through the at least one opening flows in the suction direction.

2. The suction device according to claim 1, wherein the suction pipe comprises a first tube channel for transporting yarns along a pipe axis of the suction pipe and a second tube channel for transporting an air flow.

3. The suction device according to claim 1, wherein the air supply from the air delivery system to the cyclone elements can be closed, and/or the air supply to the mouthpiece can be closed independently thereof.

4. The suction device according to claim 3, wherein the suction device comprises an operating element for closing and/or opening the air supply to at least one of the cyclone elements and/or to the mouthpiece by a user.

5. A textile machine comprising a suction device according to claim 1.

6. A method for sucking yarns in a textile machine with a suction device, according to claim 1, comprising the steps of: aligning a mouthpiece with yarn ends; sucking the yarn ends through the mouthpiece into a suction pipe; and passing a yarn through a first and a second cyclone element.

7. The method according to claim 6, wherein the method comprises the steps of operating an operating element to close the air supply to at least one cyclone element operating the operating element to close the air supply to the mouthpiece and simultaneously opening the air supply to at least one cyclone element.

8. The suction device according to claim 1, wherein the air delivery system is a common air delivery system for the cyclone elements.

9. The suction device according to claim 8, wherein the at least one opening at the periphery is connected to a common air supply in such a way that vortexes in both cyclone elements have the same direction of rotation.

10. The suction device according to claim 1, wherein the suction device comprises a Laval nozzle.

11. The suction device according to claim 1, wherein a vortex volume of a second cyclone element comprises at least 120% of a vortex volume of the first cyclone element.

12. The suction device according to claim 1, wherein the suction device comprises a first suction diameter upstream of the first cyclone element, a second suction diameter upstream of the second cyclone element and a third suction diameter downstream of the second cyclone element, the first suction diameter being smaller than the second and third suction diameters and the second suction diameter being smaller than the third suction diameter.

13. The suction device according to claim 1, wherein the air delivery system serves as an air supply to the mouthpiece via a second tube channel.

14. The suction device according to claim 3, wherein the air supply from the air delivery system to at least one of the cyclone elements can be closed, and/or the air supply to the mouthpiece can be closed independently thereof by means of a switch-over valve for switching an air flow between the second tube channel and at least one cyclone element.

15. The method according to claim 6, wherein the suction device is a suction device according to claim 1.

Description

(1) Embodiments of preferred suction devices are explained by way of example with reference to the following figures.

(2) They show:

(3) FIG. 1: Cross-section through a first embodiment of a suction device

(4) FIG. 2: Cyclone elements of the suction device shown in FIG. 1

(5) FIG. 3: Air flow through the cyclone elements of the suction device shown in FIG. 2

(6) FIG. 4: Cross-section through a second embodiment of the suction device

(7) FIG. 1 shows a cross-section through a suction device 100. The suction device 100 comprises a mouthpiece 2 at a first end of a suction pipe 3 in suction direction A, a suction pipe 3 and a suction element 5 with two cyclone elements 1a and 1b and a Laval nozzle 13, the walls of which open with a pitch between 2?-10?.

(8) The suction pipe 3 comprises an outer shell 4 for protection against damage to a textile machine. At a first end 11a the mouthpiece 2 is attached to the suction pipe 3. At the opposite second end 11b a handle 8 is arranged. With this second end 11b the suction pipe 3 is connected to a housing 7 of the suction element 5.

(9) The suction element 5 comprises this housing 7, the two cyclone elements 1a, 1b and a connection 14 to a compressed air line.

(10) The housing 7 comprises an air chamber 6 and an air supply 12. The two cyclone elements 1a and 1b are arranged in the housing 7. The housing 7 comprises an interior 15 which surrounds the two cyclone elements 1a and 1b and supplies them with compressed air.

(11) When using the suction device 100, the mouthpiece 2 is aligned with one end of the yarn. A stream of air is introduced into the cyclone elements 1a and 1b via the port 14 through the air supply 12. This creates a negative pressure, whereby a yarn is fed through the mouthpiece 2, the suction pipe 3, the first cyclone element 1a, the second cyclone element 1b into the Laval nozzle 13.

(12) FIG. 2 shows in detail the cyclone elements 1a and 1b of the suction device 100 in cross-section.

(13) Along the suction direction A, a pipe section 21 with a first suction diameter 26 of 4 mm is arranged first; in other embodiments (not shown here), the first suction diameter 26 can be up to 20 mm. This is followed by the first cyclone element 1a. The cross-section of the tube therefore opens in the first inlet section 31a of the first cyclone element 1a with a pitch of 60? to the first maximum cyclone diameter 27 of 6 mm, which is maintained for 1 mm. In other embodiments (not shown here), the first inlet section 31a may open with a pitch of up to 120? to the first maximum cyclone diameter 27 of up to 32 mm, which is maintained for up to 4 mm. Thereafter, the cyclone element 1a narrows in the first exit section 25a with a pitch of 30? to the second suction diameter 28 of 5 mm. In other embodiments (not shown here), the diameter in the first exit section 25a may be narrowed with a pitch of up to 60? to a second suction diameter 28 of up to 30 mm. The second suction diameter 28 is maintained in an intermediate section 22. The intermediate section 22 is 4 mm long. In other embodiments (not shown here), the intermediate section 22 may be up to 12 mm long. The second cyclone element 1b follows. Here, the tube opens with a 60? pitch in a second inlet section 24b to the second maximum cyclone diameter 29 of 8 mm. In other embodiments (not shown here), the second inlet section 24b may open with a pitch up to 120? to the second maximum cyclone diameter 29 of up to 48 mm, maintaining this diameter up to 4 mm. Thereafter, the second cyclone element 1b narrows with a pitch of 30? in an exit section 25b to the third suction diameter 30 of 6 mm in the transition section 23. In other embodiments (not shown here), the diameter in the second exit section 25b may narrow with a pitch of up to 60? to a third suction diameter 30 of up to 37 mm. The third suction diameter 30 is maintained for 4 mm.

(14) Peripheral openings 31a and 31b are provided in the first and second inlet sections 24a and 24b, respectively, through which air flows are directed into the cyclone elements 1a and 1b.

(15) The cyclone elements 1a and 1b are formed by three successive plug-on sections 32a, 32b and 32c in the suction direction. The first plug-on element 32a comprises the pipe section 21 and the inlet section 24a. The second push-on element 32b comprises the area with the first maximum cyclone diameter 27, the first outlet section 25a, the intermediate section 22 and the second inlet section 24b. The third push-out element 32c comprises the region with the second maximum cyclone diameter 29, the outlet section 25b and the transition section 23.

(16) The first push-on element 32a is pushed onto the second push-on element 32b and the second push-on element 32c is pushed onto the third push-on element 32c.

(17) FIG. 3 shows the air flow through the cyclone elements 1a and 1b of the suction device 100. The air flow through the suction pipe 3 is substantially parallel to the inner walls of the suction pipe 3. The vortex volume in the first cyclone element 1a comprises almost the entire volume of the cyclone element 1a. The vortex volume of the second cyclone element 1b is larger than that of the first. The vortex volume is the volume consisting of the average diameter of the vortex flow and the length in suction direction within a cyclone element.

(18) FIG. 4 shows a cross-section of a further embodiment of the suction device 100. Only the differences from the first embodiment of the suction device 100 are explained here.

(19) The suction device 100 comprises an attachment element 52 which is placed on the suction pipe 3. The suction pipe 3 of this embodiment is shorter than in the previous embodiment. This suction pipe 3 also comprises an air duct 55 which guides an air flow from the air supply 54 to the attachment element 52.

(20) The mouthpiece 50 of this embodiment is part of the attachment element 52. The attachment element 52 further comprises an air channel 51 which is connected to the air channel 55 of the suction pipe 3. The air channel 51 guides the air flow from the suction pipe 3 to openings 53 at the periphery in the mouthpiece 50. This allows a suction flow to be generated already at the entrance to the suction device 100. In conventional suction devices 100, the suction is generated at the other end 11b of the suction pipe 3, which requires a greater suction force.

(21) The embodiment of FIG. 4 can also be executed without a double cyclone.

(22) FIG. 4 further shows an operating element formed by a switch-over valve 56 which is adapted for closing and opening the air supply 54 to the cyclone elements and closing and opening the air supply 54 to the mouthpiece by a user. While closing the air supply 54 to the mouthpiece, the air supply to the cyclone element may be simultaneously opened. Alternatively, the air supply 54 to the cyclone elements can be closed and/or the air supply 54 to the mouthpiece 50 can be closed independently thereof by means of the switch-over valve 56 for switching an air flow between the air channel 55 and the cyclone elements.