DRYER FOR A TEXTILE WEB, WITH IMPROVED HOT-AIR SUPPLY

Abstract

A dryer for a textile web includes a drying chamber having at least one air-permeable drum arranged in the drying chamber to rotate, wherein the drum includes an end face constituting an axially arranged suction side, the textile web is wrapable at least partially around the drum and heated drying air is flowable through the textile web. A hot gas source provides heated gas. A ventilator forms a suction draft via the suction side of the drum with drying air from inside of the drum and drying air that recirculates back into the drying chamber. At least one hot gas feeding ring encloses the suction draft and is configured to permit the hot gas from the hot gas source to flow essentially completely into the suction draft.

Claims

1. A dryer for a textile web, comprising: a drying chamber having at least one air-permeable drum arranged in the drying chamber to rotate, wherein the drum includes an end face constituting an axially arranged suction side, the textile web is wrapable at least partially around the drum and heated drying air is flowable through the textile web; a hot gas source to produce heated gas; a ventilator to form a suction draft via the suction side of the drum with drying air from inside of the drum and drying air that recirculates back into the drying chamber, and at least one hot gas feeding ring enclosing the suction draft configured to permit the hot gas from the hot gas source to flow essentially completely into the suction draft.

2. The dryer according to claim 1, wherein the hot gas feeding ring has a circumference and includes in at least one region of the circumference a heating channel that is tapered toward a ring center of the hot gas feeding ring via which the hot gas is conducted in the hot gas feeding ring.

3. The dryer according to claim 1, wherein the hot gas feeding ring includes a first side that adjoins the end face of the drum and a second side, and further including a ventilator arranged on the second side of the hot gas feeding ring.

4. The dryer according to claim 1, wherein the hot gas source comprises a gas blower burner and a combustion tube coupled to the gas blower burner.

5. The dryer according to claim 4, further including a ventilation chamber in which the ventilator is arranged, wherein the combustion tube extends at least in some sections through the ventilation chamber to allow convection heating of the drying air on an outside of the hot combustion tube.

6. The dryer according to claim 1, wherein the at least one air permeable drum comprises two air permeable drums, the hot gas source comprises a first hot source and a second hot gas source, and the at least one hot gas feeding ring comprises a first hot gas feeding ring connected to the first hot gas source and a second hot gas feeding ring connected to the second hot gas source, wherein both hot gas feeding rings are arranged adjacent to each other to enclose the suction draft of a respective one of the drums.

7. The dryer according to claim 6, wherein the second hot gas source comprises a peripheral heating source.

8. The dryer according to claim 6, wherein the hot gas feeding rings each have a circular U-shaped box profile and one exit opening arranged to point radially toward an inside of the hot gas feeding ring.

9. The dryer according to claim 1, wherein the dryer includes a plurality of drums and the at least one hot gas feeding ring includes at least one hot gas feeding ring associated with each of the drums.

10. The dryer according to claim 9, wherein the hot gas source constitutes a joint hot gas source and the at least one hot gas feeding ring comprise first and second hot gas feeding rings connected to the joint hot gas source.

11. The dryer according to claim 10, wherein the hot gas source comprises a combustion burner adjoined by a housing comprising a first connection outlet to attach the first hot gas channel and a second connection outlet spaced from the first connection outlet to attach the second hot gas channel that extends from the housing at an angle with respect to the first hot gas channel.

12. The dryer according to claim 5, further including an intermediate chamber between the drying chamber and the ventilation chamber, wherein the intermediate chamber includes at least one of an inlet to receive a stream of fresh air and an outlet from which exhaust air can be released, and wherein the at least one hot gas feeding ring is arranged in the intermediate chamber.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Further measures that improve the invention are explained in the following together with the description of a preferred embodiment and with the aid of the Figures, in which:

[0020] FIG. 1 is a cross-sectional view through a dryer, showing a drum and the arrangement of a hot gas feeding ring according to the invention;

[0021] FIG. 2 is another view of the arrangement of the hot gas feeding ring;

[0022] FIG. 3 is a perspective view of the hot gas feeding ring;

[0023] FIG. 4 is a view from the side of the hot gas feeding ring;

[0024] FIG. 5 is an arrangement of two hot gas feeding rings which are respectively assigned to a separate drum and are supplied with hot gas from a joint hot gas source;

[0025] FIG. 6 is a perspective view of two drums with respectively two hot gas feeding rings positioned in front of the drum end faces, wherein respectively two hot gas feeding rings of adjacent drums are supplied with hot gas from a joint hot gas source.

DETAILED DESCRIPTION OF THE INVENTION

[0026] The cross-sectional view in FIG. 1 shows a dryer 100 for a textile web 1 with a drying chamber 10 in which an air-permeable drum 11 is arranged to rotate and the textile web 1 is wrapped around the drum 11. Also provided is a ventilator 12 which can function to form via a suction side 13, embodied axial to the drum 11, a suction draft 14 of air coming from the drum 11 inside and to recirculate drying air 15 back into the drying chamber 10, and wherein heating gas can be supplied to the recirculating drying air 15 with the aid of a hot gas source 16. The drying air flows from a ventilation room 26, in which the ventilator 12 is position, initially into an antechamber 28. The antechamber 28 is separated from the dryer room 10 by a screening cover 31, wherein antechambers 28 with screening covers 31, which separate the antechambers 28 from the drying chamber 10, are embodied on the top as well as the bottom side of the drum 11. The screening covers 31 result in further uniformity in the heated drying air 15 which enters the antechambers 28 and flows evenly via the screening covers 31 into the drying chamber 10.

[0027] The invention provides a hot gas feeding ring 17 for feeding hot gas into the drying air 15, wherein this ring encloses the suction draft 14, so that the hot gas can essentially flow completely into the suction draft. In the process, the drying air 15 in the form of the suction draft 14 from the inside of the drum 11 mixes with the hot gas before reaching the ventilator 12. Owing to the turbulence in the ventilator 12, the moist drying air 15 from the drum 11 mixes homogeneously with the hot gas from the hot gas source 16. Finally, the well mixed drying air 15 can flow from the ventilation chamber 26 into the antechamber 28.

[0028] According to the embodiment shown, the hot gas source 16 is a gas blower burner 21 with adjoining combustion tube 22. The combustion tube 22 extends at least partially into the ventilation chamber 26, to allow convection heating of the drying air 15 on the outside of the combustion tube 22, thereby further heating up the drying air 15, as represented by the arrows extending in a radial direction from the combustion tube 22.

[0029] The arrangement of the drum 11 shows that the end face 19 essentially adjoins the hot gas feeding ring 17 and that the ventilator 12 is provided with a suction side 13 which is adjoined by the hot gas feeding ring 17 on the side opposite the end face 19 of the drum 11. The hot gas feeding ring 17 thus forms a transition from the end face side 19 of the drum 11 to the suction side 13 of the ventilator 12.

[0030] FIG. 2 shows a detailed view of the ventilation chamber 26 which is arranged adjacent to the drying chamber 10, not shown in further detail herein. The suction draft 14, suctioned in via its suction intake 20 and through the hot gas feeding ring 17, is shown with a number of arrows. The suction draft 14 is drawn from the inside of a drum, wherein the non-depicted drum has a suction side 13 that adjoins a separating wall 32 which separates the drying chamber 10 from the ventilation chamber 26. To guide the suction draft 14 through, the separating wall 32 has an opening 34 which is made to coincide with the suction side 13 of the drum.

[0031] The drying air 15 leaves the ventilator 12 and flows into the ventilation chamber 26, wherein the drying air 15 is shown with an additional number of arrows. Hot gas is generated with the aid of the hot gas source 16, which comprises a gas blower burner 21 and a combustion tube 22. The hot gas is supplied via a hot gas channel 18 and the following hot gas feeding ring 17 to the suction draft 14. The hot gas mixes with the suction draft 14 and meanders through the ventilator 12. The temperature of the drying air 15 is thus higher than the temperature of the drying air in the suction draft 14. On the back of the ventilator 12, a motor 29 is shown which is located outside of the ventilation chamber 26, in the same way as the gas blower burner 21.

[0032] FIG. 3 shows a perspective view of a hot gas feeding ring 17 provided with a channel connection 30, wherein the channel connection 30 can be connected to the hot gas channel 18 (see FIG. 2). The hot gas feeding ring 17 has a U-shaped box profile which forms an outlet opening 23 in a radial direction toward the inside through which the hot gas can be fed into the suction draft 14.

[0033] FIG. 4 shows a view from the side of the hot gas feeding ring 17. Also shown are guide sheets 33 which function to mostly even out the hot gas discharge over the circumference of the outlet opening 23.

[0034] The hot gas feeding ring 17 is furthermore designed such that the through opening 34 is formed off-center, with reference to the U-shaped box profile, so that the U-shaped box profile has a greater profile depth in the direction toward the channel connection 30 while the U-shaped box profile is tapered toward the point opposite the channel connection 30. Owing to the cross section becoming smaller, the flow of hot gas thus is evened out within the hot gas feeding ring 17, such that the hot gas essentially exits the outlet opening 23 uniformly distributed over the circumference.

[0035] FIG. 5 shows another exemplary embodiment of an arrangement of two hot gas feeding rings 17, respectively arranged upstream of a respective drum 11, wherein the hot gas feeding rings 17 are supplied via a joint hot gas source 16. An angular housing 24, which is provided with separate connecting outlets 25 for connecting hot gas channels 18, functions to divide the hot gas coming from the hot gas source 16. As a result, respectively one hot gas channel 18 connects the hot gas feeding rings 17 with the hot gas source 16. The hot gas channels 18 consequently are arranged at an angle to each other, wherein the hot gas source 16 between the two hot gas feeding rings 17 is arranged off-center. If hot gas is supplied via the hot gas source 16 and the hot gas channels 18 extend to the hot gas feeding rings 17, the hot gas can flow as previously described via the respective exit openings 23 of the hot gas feeding rings 17 into the suction draft 14 on the respective sides of the drums 11.

[0036] FIG. 6 shows a perspective view of two drums 11 inside a drying chamber 10, not shown further herein. The exemplary embodiment shows an intermediate chamber 27, wherein this intermediate chamber 27 is separated from the drying chamber 10 by the separating wall 32. Located in front of the intermediate chamber 27 is the ventilation chamber 26 which is separated via a different separating wall 35 from the intermediate chamber 27.

[0037] A first pair of hot gas feeding rings 17 is connected to a first hot gas source 16, and a second pair of hot gas feeding rings 17′ is connected to a second hot gas source 16′. The pairs of hot gas feeding rings 17 and 17′ are arranged such that a hot gas feeding ring from the first pair 17 is located in front of an end face 19 of the drum 11 and, adjacent thereto, a further hot gas feeding ring of the second pair 17′ is arranged in an adjacent arrangement.

[0038] For this, the first hot gas source 16 can be a gas blower burner with a combustion tube and the second hot gas source 16′ can be an external heat source, for example a peripherally arranged cogeneration plant. The two hot gas sources 16 and 16′ are thus provided via respective hot gas feeding rings 17 and 17′ for each suction draft which is generated via the end faces 19 from the drums 11.

[0039] The embodiment of the invention is not restricted to the above-mentioned, preferred embodiment. Rather, a number of variants are conceivable which use the solution shown, even with basically very differently designed embodiments.

[0040] It will be understood that the above description of the present invention is susceptible to various modifications, changes and adaptations, and that the same are intended to be comprehended within the meaning and range of equivalents of the appended claims.