Device for attenuating an exhaust-gas noise, system comprising a device of said type, sorption dryer having a device of said type, and method for attenuating an exhaust-gas noise

Abstract

The invention relates to a device for attenuating an exhaust-gas noise, comprising a hollow chamber, which has an inlet for the exhaust gas, and comprising an absorber section, wherein the hollow chamber is closed form at the end spaced apart from the inlet, and the hollow chamber has, between the closed end and the inlet, a passage to the absorber section.

Claims

1. A device for attenuating noise of an exhaust gas, comprising a hollow chamber having an inlet for the exhaust gas and an absorber section, wherein the hollow chamber includes an inlet and a closed, wherein the hollow chamber has, between the closed end and the inlet, at least one passage to the absorber section, wherein the passage is arranged in a region of the hollow chamber which is at a distance from the closed end of between and of the distance between the inlet and the closed end, and wherein all passages are formed in the region of the hollow chamber.

2. The device according to claim 1, wherein the passage has a smaller cross-sectional area than the hollow chamber.

3. The device according to claim 1, wherein the absorber section at least partially surrounds the hollow chamber.

4. The device according to claim 1, wherein the absorber section comprises a porous material.

5. The device according to claim 1, wherein the passage is formed in the region of the hollow chamber which is at a distance from the closed end of between and of the distance between the inlet and the closed end.

6. The device according to claim 1, wherein a diameter of the passage is smaller than a width of the absorber section.

7. The device according to claim 6, wherein there are formed two passages to the absorber section, and wherein the two formed passages are arranged at about the same distance from the inlet.

8. The device according to claim 1, wherein the absorber section extends transversely with respect to the passage in such a manner that the exhaust gas downstream of the passage is deflected through 90 and is guided, at least partially, longitudinally with respect to the hollow chamber.

9. The device according to claim 1, further comprising outlets facing in two different directions.

10. The device according to claim 1, wherein the hollow chamber is extendable in its longitudinal extent in a modular manner.

11. The device according to claim 10, wherein the end of the hollow chamber that is spaced apart from the inlet has an automatically-opening valve which opens automatically when connecting the closed end of the hollow chamber that is spaced apart from the inlet to a further hollow chamber.

12. A system comprising a device according to claim 1, wherein two devices are connectable to one another in an end-to-end manner.

13. A sorption dryer having a device according to claim 1, wherein the device is arranged, in a flow path, downstream of a container with sorbent.

14. The device according to claim 1, wherein the absorber section comprises an open-cell melamine resin foam.

15. The device according to claim 1, wherein the passage is formed in a region of the hollow chamber which is at a distance from the closed end of between 0.4 and 0.6 of the distance between the inlet and the closed end.

Description

(1) The invention will be described in more detail below on the basis of the exemplary embodiments illustrated in the drawings.

(2) In the drawings:

(3) FIG. 1 shows a diagrammatic illustration of a sorption dryer having devices for attenuating noise of an exhaust gas;

(4) FIG. 2 shows in a sectional illustration a device for attenuating noise of an exhaust gas;

(5) FIG. 3 shows in a sectional illustration two devices connected to one another for attenuating noise of an exhaust gas;

(6) FIG. 4 shows a perspective view of a first embodiment of a hollow chamber for the device according to the invention;

(7) FIG. 5 shows a perspective view of a second embodiment of a hollow chamber for the device according to the invention; and

(8) FIG. 6 shows a perspective view of a third embodiment of a hollow chamber for the device according to the invention.

(9) FIG. 1 shows an exemplary embodiment of a sorption dryer for a fluid. The device has a housing 1 in which a flow path for the pressurized fluid is formed. A pre-filter 2 for extracting particles and condensate from the fluid is arranged after an inlet. Downstream, a changeover valve 3 following the pre-filter 2 is provided. Following the changeover valve 3 downstream there are containers 4, one in each of two mutually parallel flow paths in the tube lines. A device 10, designed as a cartridge, for holding a drying agent can be respectively inserted into the container 4. Also after the changeover valve 3 there is a solenoid valve 8 with which a connection to the surroundings via a device 9 for attenuating noise can be established.

(10) A changeover valve 5 follows the container 4. Following the changeover valve 5 downstream there is a post-filter 6 in which abraded material of the drying agent can be retained. After the post-filter 6 there is the outlet of the sorption dryer from which the pressurized fluid can reach a fluid supply network in a dry and clean state and be used.

(11) According to the exemplary embodiment shown in FIG. 1, the sorption dryer has a control unit 7 which has signal inputs and signal outputs. The control unit 7 controls the solenoid valves 8. Furthermore, the signal of a sensor which is arranged, in the flow direction, between the changeover valve 5 and the post-filter 6 and which serves for determining the moisture content of the fluid can be detected. The control unit 7 can detect, monitor and/or control states of the sorption dryer.

(12) FIG. 2 diagrammatically shows an embodiment of a device 9 for attenuating noise of an exhaust gas.

(13) The exhaust gas 10 can enter the device 9 via an inlet 10, and reaches a hollow chamber 11 which substantially has no filling. Highly pressurized exhaust gas is reflected at the end 12 of the device 9 that is spaced apart from the inlet 10 at the closed end 13 of the hollow chamber 11, and is deflected to the newly flowing exhaust gas flowing in through the inlet 10. Consequently, a reflection noise-attenuation section is formed. The exhaust gas which is then slowed down enters an absorber section 15, which is filled with an open-cell melamine resin foam, through a passage 14 of annular form. The passage 14 is formed annularly around the hollow chamber 11. The passage 14 is substantially at a distance from the closed end 13 of the hollow chamber 11 that corresponds approximately to 0.5 of the distance between the inlet 10 and the closed end 13.

(14) Following the entry of the exhaust gas into the absorber section 15, the exhaust gas is deflected through 90 and, by means of the open-cell melamine resin foam, the sound energy of the exhaust gas is converted into heat.

(15) The absorber section 15 surrounds the hollow chamber 11 around the full circumference, wherein the absorber section 15 is shorter than the length of the hollow chamber 11. On the end side, the hollow chamber 11 is opposite the absorber section 15; the hollow chamber 11 is longer than the absorber section 15. At the adjacent end of the hollow chamber in the vicinity of the inlet 10 and in the vicinity of the closed end 13 of the hollow chamber 11, the absorber section 15 respectively has an outlet 16 which is formed annularly around the hollow chamber.

(16) In the embodiment of a device 9 for attenuating noise of an exhaust gas according to FIG. 2, exhaust gas which is pressurized to a relatively low pressure can enter the device 9 via the inlet 10. The exhaust gas which undergoes only low pressurization can flow into the absorber section 15 via the passage 14.

(17) FIG. 3 diagrammatically shows in a sectional illustration two devices 9 which are connected to one another in an end-to-end manner in order to form a hollow chamber of a larger length. The devices 9 are connectable to one another by means of the ends of the hollow chamber 11 which project with respect to the absorber section 15 and on which fastening means can be formed. FIG. 3 shows two devices 9 connected to one another, wherein a larger number of devices 9 connectable to one another can also be formed, for example by attaching a further device 9 to the device 9 shown on the right in FIG. 3 in an end-to-end manner. A sleeve 17 with an inner thread is shown as a fastening or connecting means, into which are screwed the end-side walls of the hollow chamber 11 of the two devices 9 with corresponding outer threads. The previously closed end 13 of the device 9 illustrated in FIG. 2 is connected to an inlet 10 of a further device 9, and the two devices 9 are fluidically connected by means of their hollow chambers 11. The closed end 13 of the second device 9 then represents the closed end of the two hollow chambers 11 of the device 9. When exhaust gas enters via the inlet 10 of the device 9 on the left-hand side, which gas is highly pressurized, the exhaust gas initially flows through the hollow chambers 11 and is reflected at the closed end 13. The previously highly-pressurized exhaust gas passes through the passage 14 of the left one of the two devices 9 in FIG. 3 from the hollow chamber 11 into the absorber section 15, and flows through the latter.

(18) Exhaust gas at low pressure in the two devices 9 of FIG. 3 passes through the passages 14 of the two devices 9 without any significant reflection at the closed end 13 of the hollow chamber 11, and flows through the absorber section 15.

(19) FIG. 4 shows in a perspective view a first design of a hollow chamber 11, as can be used for the device according to the invention. The hollow chamber 11 has an inlet 10 (not shown in further detail with regard to its joint geometry). The hollow chamber 11 further has a closed end 13. A plurality of passages 14 in the form of circular openings are provided in a region of the hollow chamber which is at a distance from that the end 13 that is spaced apart from the inlet 10 of between and of the distance between the inlet 10 and the spaced-apart end 13

(20) FIG. 5 shows a design of a hollow chamber 11 which is comparable with the design shown in FIG. 4, as can be used for the device according to the invention. However, in the hollow chamber in FIG. 5, a plurality of passages in the form of circular passages 14 are provided in a region of the hollow chamber which is at a distance from the end 13 that is spaced apart from the inlet 10 of between and of the distance between the inlet 10 and the spaced-apart end 13.

(21) Whereas the hollow chambers 11 of FIGS. 4 and 5 are each formed with one tube, in the circumferential surface of which the passages 14 are introduced as holes, FIG. 6 shows an embodiment of a design of a hollow chamber 11 which is formed with two tubes 20, 21.

(22) The tubes 20, 21 are arranged in line with one another. At one end of the first tube 20, the elements required for the inlet 10 (not shown in more detail in FIG. 6) are formed. At the end 13 that is spaced furthest apart from the inlet, the second tube 21 is formed in a closed manner, for example by way of a closure element provided there (not shown in more detail in FIG. 6) or, for example, by way of a valve. The first tube 20 and the second tube 21 are connected at their remaining ends via a connecting piece 22. The connecting piece 22 connecting the two tubes 20, 21 has projections 23 which extend between the annular end surfaces, facing one another, of the tubes 20, 21. As a result, an encircling gap initially formed between the annular end surfaces, facing one another, of the tubes 20, 21 is subdivided into circular segments. The respective passage 14 is then delimited by the oppositely-positioned edges of two adjacent projections 23 and the segment sections, situated between the adjacent projections 23, of the annular end surfaces of the tubes 20 and 21. A number of passages 14, which corresponds to the number of projections 23 of the connecting piece 22, are provided around the circumference of the hollow body.