Heat exchanger

Abstract

A heat exchanger having a first section, through which a first medium can flow, and a second section, through which a second medium can flow. During operation a heat exchange takes place between the first and the second medium. The first section has an inlet chamber and first tubes connected to the inlet chamber, and an outlet chamber and second tubes connected to the outlet chamber. The first tubes are each closed at the ends facing away from the inlet chamber and each second tube is at least partly arranged inside one of the first tubes, and the end of the second tube that faces away from the outlet chamber is open to the interior of the respective first tube. The second section has an inlet means and an outlet means.

Claims

1. A heat exchanger comprising: a first section through which a first medium can flow, and a second section through which a second medium can flow, wherein during operation a heat exchange takes place between the first and the second medium, wherein the first section comprises an inlet chamber and first tubes connected to the inlet chamber, and an outlet chamber and second tubes connected to the outlet chamber, wherein the first tubes are each closed at the ends facing away from the inlet chamber, and wherein each second tube is at least partly arranged inside one of the first tubes, and the end of each second tube that faces away from the outlet chamber is open to the interior of the respective first tube, wherein the second section comprises an inlet means and an outlet means, wherein the inlet means opens into a heat exchanger chamber and the heat exchanger chamber at least partly surrounds the first tubes of the first section, wherein the heat exchanger chamber is connected to the outlet means, wherein the inlet means comprises a shut-off device for shutting off the fluid flow of the second medium into the heat exchanger chamber, and that a bypass device connects the inlet means and the outlet means to lead the fluid flow of the second medium at least partly past the heat exchanger chamber, wherein the shut-off device is arranged downstream of the bypass device in the flow direction of the second medium.

2. The heat exchanger according to claim 1, wherein the bypass device comprises a control device for control of the fluid flow of the second medium through the bypass device.

3. The heat exchanger according to claim 1, wherein the shut-off device has a control function.

4. The heat exchanger according to claim 1, wherein the heat exchanger chamber is formed by an elongated tube.

5. The heat exchanger according to claim 4, wherein a casing tube surrounds the elongated tube of the heat exchanger chamber and that the casing tube opens into the outlet means, wherein, on the side facing away from the inlet means, the elongated tube is open toward a gap space formed between the casing tube and the elongated tube.

6. The heat exchanger according to claim 1, wherein by a casing in which the inlet chamber, the outlet chamber and the heat exchanger chamber are accommodated.

7. The heat exchanger according to claim 6, wherein the casing forms the casing tube.

8. The heat exchanger according to claim 6, wherein the inlet chamber and the outlet chamber are arranged in a first end section of the casing.

9. The heat exchanger according to claim 6, wherein the inlet means and the outlet means are arranged on a second end section of the casing.

10. The heat exchanger according to claim 6, wherein the heat exchanger chamber is arranged in a central section of the casing.

11. The heat exchanger according to claim 1, wherein the inlet means comprises an inlet tube connector and the outlet means comprises an outlet tube connector, wherein the inlet tube connector and the outlet tube connector are arranged coaxially to each other or their axes are arranged in a horizontal plane.

12. The heat exchanger according to claim 1, wherein the outlet means comprises a second outlet chamber, wherein the inlet means traverses the second outlet chamber and wherein the bypass device comprises a bypass tube connector extending from the inlet means into the second outlet chamber.

13. The heat exchanger according to claim 12, wherein the outlet tube connector opens into the second outlet chamber.

14. The heat exchanger according to claim 1, wherein each second tube is designed as a double-walled tube comprising an inner tube and an outer tube, wherein the inner tube and the outer tube are connected to each other on the end facing away from the outlet chamber or on the end facing toward the outlet chamber.

15. The heat exchanger according to claim 1, wherein in the heat exchanger chamber, flow deflection elements are arranged for deflecting the flow of the second medium.

Description

BRIEF DESCRIPTION

(1) The invention will be explained in greater detail hereunder with reference to the accompanying Figures.

(2) In the Figures

(3) FIG. 1 is a schematic sectional view of a heat exchanger according to the invention,

(4) FIG. 2 is a schematic detailed view of the first end section of the casing of the heat exchanger shown in FIG. 1, and

(5) FIG. 3 is a schematic detailed view of the second end section of the casing of the heat exchanger shown in FIG. 1.

DETAILED DESCRIPTION

(6) In FIGS. 1-3, a heat exchanger 1 according to the invention is schematically shown in sectional view.

(7) The heat exchanger 1 consists of a first section 3 adapted for through flow of a first medium, and a second section 5 adapted for through flow of a second medium.

(8) In operation of heat exchanger 1, a heat exchange occurs between the first and the second medium.

(9) The first section 3 of heat exchanger 1 comprises a an inlet chamber 7 and first tubes 9 connected to the inlet chamber. Via a tube connector 11, the first medium can be conducted into inlet chamber 7. On an end 9a facing away from inlet chamber 7, the tubes 9 are closed. The first tubes 9 are parallel to each other and are arranged as tube bundle.

(10) Further, the first section 3 comprises an outlet chamber 13 connected to a further tube connector 11 through which the first medium can be discharged from the heat exchanger 1.

(11) The outlet chamber 13 is arranged in the inlet chamber 7 and connected to a plurality of second tubes 15. Each second tube 15 is partly arranged within one of the first tubes 9. In other words: A second tube 15 is inserted into a first tube 9. The end 15a of each second tube 15 facing away from outlet chamber 13 is open toward the interior of the respective first tube 9.

(12) Via tube connector 11, the first medium flowing through the first section 3 will enter the inlet chamber 7. From there, the medium will flow in the annular gap 17 formed between the first tube 9 and each second tube 15, until reaching the end 9a of each tube 9 facing away from inlet chamber 7. Since the first tubes 9 are closed on this end, the first medium will flow into the second tube 15 and in the direction of outlet chamber 13. Within the latter, the first medium, which flows back, will be collected and will be discharged via the tube connector 11 connected to outlet chamber 13.

(13) In the illustrated exemplary embodiment, the second tube 15 is configured as a double-walled tube and comprises an inner tube 15b and an outer tube 15c. The annular gap 15d formed between inner tube 15b and outer tube 15c is open toward inlet chamber 7. On the end 15a of second tube 15 facing away from outlet chamber 13, the inner tube 15b is connected to outer tube 15c so that the annular gap 15d is closed at this end. Such a configuration of the second tube 15 serves, on the one hand, as a radiation shield for the inner tube 15b while, on the other hand, first medium flowing into inlet chamber 7 will enter the annular gap between inner tube 15b and outer tube 15c and will remain there. This medium provides for an additional protective insulation effect. Thereby, the heat transfer can be rendered uniform.

(14) The second section 5 of the heat exchanger 1 of the invention comprises an inlet means 19 and an outlet means 21. The inlet means 19 comprises an inlet tube connector 23 via which the second medium is supplied to heat exchanger 1. The outlet means 21 comprises an outlet tube connector 25 via which the second medium can flow out of the heat exchanger. In the exemplary embodiment shown in the Figures, the inlet tube connector 23 and the outlet tube connector 25 are arranged coaxially relative to each other.

(15) The inlet means 19 opens into a heat exchanger chamber 27 which surround the first tubes 9 of first section 3. An elongated tube 27a surrounds the heat exchanger chamber 27. The second medium will flow through the inlet means 19 into the heat exchanger chamber 27 and thus surrounds the first tubes 9. On the surface of the first tubes 9, there is thus generated a heat transfer surface by means of which a heat exchange can be performed between the first and the second medium.

(16) In the heat exchanger chamber 27, flow deflection elements 28 are formed which will effect a deflection of the flow direction of the second medium. In this manner, a heat exchange is enhanced. The flow deflection elements 28 can be designed in the form of ring or disk elements. The flow deflection elements 28 can be plates, e.g. deflection plates, or spiral-shaped deflection elements. By the arrangement of the flow deflection elements 28, the flow direction of the second medium is changed by way of a forced guidance of the second medium. Further, the amount of the pressure loss of the second medium when flowing through the heat exchanger chamber 27 is reduced.

(17) At the end of heat exchanger chamber 27 facing away from the inlet means 19, the elongated tube 27a is open. A casing tube 29 surrounds the elongated tube 27a so that a gap space 31 is formed between the elongated tube 27a and the casing tube 29. Said gap space 31 merges into a second outlet chamber 33 which is a part of outlet means 21 and opens into outlet tube connector 25. At the end of casing tube 29 facing away from outlet means 21, casing tube 29 is connected to a casing separating wall 35 having the first tubes 9 passing through it. The casing separating wall 35 closes off the heat exchanger chamber 27 and the gap space 31 at the end facing away from outlet means 21. Thus, the second medium flowing through the heat exchanger chamber 27 will be deflected, by means of the casing separating wall 35, into the gap space 31 and will flow through the gap space 31 into the second outlet chamber 33.

(18) From the inlet means 19, a bypass device 37 leads to the outlet means 21. In this arrangement, a bypass tube connector 39 is connected to inlet means 19 and extends into second outlet chamber 33. Thus, second medium which is flowing in through inlet means 19 can thus by conducted past the heat exchanger chamber 27 and flow directly to outlet means 21.

(19) Further, the bypass device 37 in the exemplary embodiment shown in the Figures comprises a control device 43. By means of the latter, the pressure loss at the bypass device 37 can be controlled. This allows in a particularly advantageous manner for a control of the flow of the second medium through heat exchanger chamber 27 and bypass device 37. Thereby, control of the mixing temperature of the second medium at the outlet means 21 is rendered possible in an advantageous manner.

(20) The inlet means 19 comprises a shut-off device 41 which, when viewed in the flow direction of the second medium, is arranged downstream of bypass device 37 within the inlet means 19. With the aid of said shut-off device, the fluid flow of the second medium into heat exchanger chamber 27 can be shut off. Thus, in the locking position of shut-off device 41, the second medium will flow completely through bypass device 37 into the outlet means 21. Shut-off device 41 makes it possible to perform an emergency switch-off, thus protecting the component parts within heat exchanger chamber 27.

(21) The shut-off device 41 can also have a control function to the effect that a part of the second medium will flow into heat exchanger chamber 27 and a part will flow through bypass device 37. In this manner, the heat exchanger 1 can be controlled in an advantageous manner. Thus, the shut-off device 41 can perform a shut-off function and a control function, wherein, in some embodiments, the control device 43 can also be omitted.

(22) The shut-off device 41 and the control device 43 can be designed e.g. as controllable flap. For instance, the shut-off device 41 and the control device 43 can comprise rotatingly driven flaps which are operative to delimit the throughflow in dependence on their position. The shut-off device 41 and the bypass device 37 are generally arranged separately from each other and are designed independently.

(23) The heat exchanger 1 comprises a casing 45 accommodating the inlet chamber 7, the outlet chamber 13, the heat exchanger chamber 27, the gap space 31 and the second outlet chamber 33. In this arrangement, the casing 45 forms the casing tube 29 and the casing separating wall 35.

(24) The inlet chamber and the outlet chamber are arranged in a first end section 45a of the casing. This end section can extend e.g. along 10-20% of the length of the entire casing 45.

(25) The inlet means 19 and the outlet means 21 are arranged on a second end section 45b of the casing. As described, parts of inlet means 19 and of outlet means 21 are incorporated in this casing section. Also the second end section 45b of casing 45 extends along about 10-20% of the length of casing 45.

(26) The central section 45c formed between the first and second end sections 45a, 45b accommodates the heat exchanger chamber 27 and forms the gap space 31.