DE102016214086A1 - Heat exchanger - Google Patents

Abstract

The present invention relates to a heat exchanger (1), in particular a charge air cooler (7), having a tube bundle (11) which has a plurality of tubes (12) through which a first fluid can flow, which are spaced apart, wherein between the adjacent tubes (12). flow-through channels (15) of a channel system (16) are formed for a second fluid. It is essential to the invention that a covering device (23) is provided on the tube bundle (11) on the inlet side and / or outlet side, which is translationally adjustable in a translational direction (26) between a first position (24) and a second position (25) Covering device (23) in the first position (24) covers a smaller part of an associated flow cross-section (21, 22, 48, 49) than in the second position (25). As a result, in particular the formation of condensate in the heat exchanger (1) can be simplified and / or at least reduced in space.

Description

The present invention relates to a heat exchanger, in particular a charge air cooler, with a tube bundle having a plurality of spaced-apart tubes, according to the preamble of claim 1.

Heat exchangers are used to control the temperature of fluids. Generic heat exchangers in this case have a tube bundle which has a plurality of tubes through which a first fluid can flow and which are spaced apart from one another. The spaced arrangement of the tubes are formed between these flow-through channels of a channel system for a second fluid. During operation of the heat exchanger, the first fluid flows through the tubes, while the second fluid flows through the channel system. This leads to a heat exchange between the fluids and thus to a temperature control of the fluids.

During the temperature control of the fluids, condensate can be produced in one of the fluids due to thermodynamic changes. In particular, when the heat exchanger is designed as a charge air cooler for cooling charge air to be supplied by an internal combustion engine, water contained therein can condense during the cooling of the charge air. It is important to avoid that the condensate exceeds a predetermined concentration and / or leaves the heat exchanger in order to avoid damage and / or damage to a subsequent application. In the case of the intercooler condensate, which reaches the associated internal combustion engine, lead to misfires and / or damage to the internal combustion engine, in particular to a water hammer. In addition, deposits of the condensate in the heat exchanger, especially at low temperatures, freeze and damage the heat exchanger, especially the pipes, lead and / or adversely affect the pressure conditions within the heat exchanger.

To avoid the formation of condensate, it is, for example, from the DE 10 2014 105 059 A1 known to regulate and reduce a cooling capacity of the heat exchanger.

The DE 10 2012 2004 431 A1 proposes for this purpose to provide within the heat exchanger a shutter with swiveling shutter elements, which vary depending on the pivot position, a flow of the heat exchanger and thus lead to a variation of the cooling capacity of the heat exchanger and consequently to the impairment of condensate formation within the heat exchanger. The disadvantage here is that such a blind requires a relatively large space, so that the heat exchanger is large overall.

Also known is the use of flaps inside and outside the heat exchanger to vary a flow through the heat exchanger. From the DE 20 2014 101 948 U1 For example, the use of such a flap within the heat exchanger is known. However, the provision of the heat exchanger with flaps is costly, especially since this requires additional seals of the heat exchanger and corresponding actuators.

It is also conceivable to provide the heat exchanger with a bypass, which bypasses the tube bundle and thus prevents condensation within the heat exchanger. The disadvantage here is that when using such a bypass flowing through the bypass fluid is not tempered, in particular not cooled, is.

It is also conceivable to provide the heat exchanger with a drain for discharging condensate arising in the heat exchanger. The disadvantage here is that the discharge of condensate, in particular due to the constituents contained in the condensate, must comply with a wide variety of environmental laws.

The present invention is therefore concerned with the task of providing a heat exchanger of the type mentioned an improved or at least alternative embodiment, which is characterized in particular by a simplified avoidance of condensation and / or a compact design of the heat exchanger.

This object is achieved by the subject of independent claim 1. Advantageous embodiments are the subject of the dependent claims.

The present invention is based on the general idea, at least partially cover a flow cross-section flow through a tube bundle of a heat exchanger by means of a cover, wherein the covering is this translationally adjusted. The translational movement of the cover means that a simple variation of the covered area of the flow cross-section can take place, in particular bearings and the like can be omitted, so that the heat exchanger can be designed and / or assembled as a whole simpler. In addition, it is possible by the translational movement of the cover, to realize short variation paths for varying the cover of the flow cross-section, so that in turn a simplified embodiment of the heat exchanger and / or an improved reaction time is given by the cover. Furthermore, the heat exchanger is thereby made more compact and consequently requires less space. According to the idea of the invention, the heat exchanger has the tube bundle which has a plurality of tubes through which a first fluid can flow and which are spaced apart from one another. Through-flow channels of a second fluid channel system are formed between the adjacent tubes. During operation of the heat exchanger, therefore, the first fluid flows through the tubes, while the second fluid flows through the channel system, so that during operation of the heat exchanger heat exchange occurs between the fluids and thus a temperature control of the fluids. In this case, the channel system on the tube bundle on an inlet-side flow cross-section, which is composed of inlet-side channel cross sections of the channels. In addition, the channel system on the tube bundle on an outlet-side flow cross-section, which is composed of outlet-side channel cross sections of the channels. Analogously, the tube bundle has an inlet-side flow cross-section of the tubes, which is composed of inlet-side tube cross-sections of the tubes, and an outlet-side flow cross-section of the tubes, which is composed of outlet-side tube cross sections of the tubes. According to the invention, the covering device is provided in the region of at least one of the flow cross-sections, which serves to cover at least part of the associated flow cross-section. If the covering device is thus arranged in the region of the inlet-side flow cross section, it serves to cover at least part of the inlet-side flow cross section. The same applies if the covering device is arranged in the region of the outlet-side flow cross-section. According to the invention, the covering device is translationally adjustable in a direction of translation between a first position and a second position, the covering device, in the first position, covering a smaller part of the associated flow cross-section than in the second position. In the first position, the associated fluid can thus flow through a larger area into the tube bundle or flow out of the tube bundle than in the second position of the covering device. That is, when the cover means is provided in the region of one of the flow cross sections of the tubes, the first fluid in the first position can flow through a larger area into the tube bundle or flow out of the tube bundle than in the second position of the cover device. The same applies if the covering is provided in the region of one of the flow cross sections of the channel system. In this case, the covering device can also be arranged in the region of at least two of the flow cross sections. Consequently, in the second position, reduced heat exchange occurs between the first fluid and the second fluid. The reduced heat exchange is due in particular by a reduction of the heat-transferring surface of the heat exchanger in the second position of the cover. In particular, when the cover device is arranged on the inlet side of the tube bundle, it can also lead to an increase in the flow velocity of the associated fluid in the second position. The increased flow rate is advantageous because it leads to a discharge of possible resulting in the heat exchanger condensate or at least improves this discharge. The covering device can therefore be used in particular to prevent or at least to increase the formation of condensate in the fluid cooled in the heat exchanger, for example in the second fluid, by a corresponding regulation of the heat exchange between the fluids and thus by a corresponding adaptation of the cooling capacity of the heat exchanger to reduce.

The heat exchanger can in principle be configured as desired and used for controlling the temperature of any two fluids.

The heat exchanger is preferably designed as a charge air cooler for cooling a charge air for an internal combustion engine. Accordingly, it is possible with the heat exchanger according to the invention to prevent or at least reduce the formation of condensate in the charge air. As a result, it is thus possible in particular to prevent or at least reduce condensation and / or damage to the associated internal combustion engine associated with condensation. The charge air can in principle be the first fluid or the second fluid. Preferably, the charge air is the second fluid, while the first fluid is a coolant for cooling the charge air, for example, cooling air.

In a preferred embodiment, the covering device has at least one covering part which, in the second position, covers at least two of the assigned channel cross sections or tube cross sections. That is, when the covering device is provided in the region of one of the flow cross sections of the tubes, such a covering part covers at least two of the associated tube cross sections in the second position. Similarly, such a cover in the second position covers at least two of the associated channel cross sections, when the cover is provided in the region of one of the flow cross sections of the channel system. For this purpose, the cover is dimensioned in relation to the associated channel cross sections and / or the pipe cross sections accordingly.

It is conceivable, in particular, to design the cover part such that an increasing part of the flow cross section, in particular by covering an increasing number of channel cross sections, is covered by the translational adjustment of the cover part.

It is preferred if the covering device is adjacent to the associated flow cross section and guided along an upper side of the tube bundle adjoining the flow cross section. This means that the covering device can be guided in particular in an L-shaped manner, wherein the translatory movement of the covering device takes place in the region adjacent to the associated flow cross section. This allows a particularly compact design of the heat exchanger can be achieved.

In a further preferred embodiment, the covering device has at least two covering elements, which are spaced apart in the direction of translation and extend along the associated channel cross-sections or tube cross-sections. In this case, the respective cover element can be assigned to such a channel cross section or pipe cross section.

According to advantageous variants, the translational adjustment of the cover elements takes place between the first and the second position such that at least one such cover element, preferably all cover elements, in the second position at least partially covers an associated such channel cross section or an associated such tube cross section, which covers the cover element in FIG the first position in the translation direction adjacent, in particular immediately adjacent, is arranged. As a result, very short adjustment paths and reaction times are realized for adjusting the covering device between the first and the second position. In addition, the heat exchanger can thus be designed to save space.

It is particularly preferred for the respective cover element to have an element height extending in the direction of translation which corresponds at most to a pipe height of the respective pipe, in particular an associated pipe, extending in the direction of translation. This applies in particular if the covering device is provided in the region of at least one of the flow cross sections of the channel system. At the same time, at least one such cover element in the first position is aligned in the direction of translation with such a tube, which can be regarded as the associated tube of this cover element. In the second position, this cover element also covers, at least in regions, the channel cross-section which is adjacent in the direction of translation and which can be regarded as an assigned channel cross-section. The corresponding cover elements and thus the cover device thus function in the manner of a shadow mask, the at least one cover element completely releasing the associated channel cross-section in the first position by the aligned arrangement with the associated tube. The first position can be regarded as a "parking position" of the cover or the cover. Since the enlargement of the covered flow cross-section in the second position is carried out by a corresponding covering of the adjacent channel cross-section, further very short displacement paths of the covering device are realized in order to realize an adjustment of the covering device between the first position and the second position. This leads in particular to a correspondingly simplified adjustment of the covering device and / or to fast reaction times of the covering device.

An analogous embodiment is also preferred if the covering device is provided in the region of at least one of the flow cross sections of the tubes. In this embodiment, the element height extending in the direction of translation corresponds at most to a channel height of the respective channel, in particular an associated channel, which extends in the direction of translation. At least one such cover element in the first position is aligned in the direction of translation with such a channel, which can be regarded as the associated channel of this cover element. This cover also covers in the second position the adjacent in translation direction pipe cross-section, which can be considered as an associated pipe cross section, at least partially from. The corresponding cover elements and consequently the covering device thus also function in the manner of a shadow mask in this embodiment, the at least one covering element completely releasing the associated tube cross-section in the first position by the aligned arrangement with the associated channel. The first position can therefore be considered as a "parking position" of the cover or the cover. Since the enlargement of the covered flow cross section in the second position is carried out by a corresponding covering of the adjacent, associated pipe cross section, further very short displacement paths of the covering device are realized in order to realize an adjustment of the covering device between the first position and the second position. This leads in particular to a correspondingly simplified adjustment of the covering device and / or to fast reaction times of the covering device.

In principle, it is possible that the Covering the associated flow cross-section in the first position does not cover or completely releases. It is also conceivable that the cover completely covers the associated flow cross section in the second position.

In this case, the cover can be adjusted only in the first position and in the second position. It is also conceivable that the covering occupies any position between the first position and the second position.

It is conceivable to adjust all cover elements and / or cover parts of the cover together. This can be done in particular by a corresponding mechanical coupling or connection of all cover or cover.

Preferred embodiments provide that at least two of the cover elements are independently adjustable. Thus, an improved variation of the coverage of the associated flow cross section can be achieved.

The cover device may be formed in two parts and have a first part and a second part. It is conceivable that the first part is mechanically coupled to the second part of the cover. In this case, the covering device can be designed such that the second part of the covering device is not adjusted until the first part of the covering device strikes against a stop.

It is to be thought of embodiments in which at least two of the cover are mechanically connected or coupled to each other by at least one connecting element of the cover. The connecting element preferably extends inclined or transversely to the cover elements and in particular serves to stabilize the covering device. In addition, the connecting element can be used to adjust the cover elements thus connected together. Preferably, the connecting elements are arranged outside the associated flow cross-section or at the edge of the tube bundle. This results in that the connecting elements lead to no or at least a small coverage of the associated flow cross-section.

The element height of at least one cover element may be smaller than the channel height of the associated channel cross section. As a result, the associated channel cross-section is not completely covered even in the second position of the cover, so that the second fluid can flow through this channel cross-section also in the second position.

Analogously, the element height of at least one cover element may be smaller than the pipe height of the associated pipe cross section, whereby the associated pipe cross section is not completely covered even in the second position of the cover.

Also conceivable are embodiments in which the element height of at least one such cover element corresponds at least to the channel height of the associated channel cross section. This makes it possible in particular to completely cover the associated channel cross-section in the second position in the height or in the translation direction.

The element height of at least one such cover element can also correspond at least to the pipe height of the associated pipe cross section. Thus, it is possible to completely cover the associated pipe cross-section in the second position in the height or in the translation direction.

Embodiments in which a distance between two adjacent cover elements corresponds at least to the channel height of the assigned channel cross section are preferred. Thus, the covering device can be adjusted in a translational manner such that in the first position the distance between the adjacent covering elements leads to a complete release of the associated channel cross section.

The same applies to the channel height in relation to the pipe height of the associated pipe cross-section. This means that the distance between two adjacent cover elements preferably corresponds at least to the pipe height of the associated pipe cross-section

According to advantageous variants, the heat exchanger has a housing in which the tube bundle and the covering device are arranged. That is, the tube bundle and the cover device are arranged in a common housing. Thus, the required space of the heat exchanger can be further reduced and / or the structure of the heat exchanger can be further simplified.

In principle, it is conceivable to arrange the covering device on the inlet side and / or outlet side of the tube bundle.

The covering device is preferably arranged in the region of the outlet-side flow cross-section of the channel system. As a result, in particular the thermodynamic load of the cover, in particular a temperature load of the cover, is reduced.

Advantageously, the covering device is provided in the region of the inlet-side flow cross-section of the tubes. This allows the Covering, in particular the cover and / or the at least one cover, reduced weight and / or be formed thinner.

The adjustment of the covering device in the translation direction can in principle be arbitrary. It is conceivable, in particular, to guide the covering device for this purpose in a corresponding guide device.

It is advantageous if on the inside of the housing two translationally extending and mutually opposite guide grooves are provided, in which the cover is guided. The guide grooves can be molded into the housing. It is also conceivable to form the guide grooves separately and to connect to the housing. For this purpose, the respective guide groove can be fastened, in particular clipped, to corresponding fastening devices of the housing, for example tabs. It is also conceivable to rivet the respective guide groove with the housing and / or to screw.

In preferred embodiments, two protruding strips are arranged on at least one of the guide grooves. The guide groove is therefore designed in particular as a guide strip. The provision of the strips leads in particular to the fact that a displacement of the covering device inclined or transversely to the direction of translation and / or tilting of the cover, in particular the cover and / or the at least one cover, prevents or at least reduced. This measure thus leads in particular to a stabilization of the covering device.

The solution according to the invention is preferably used to prevent or at least reduce condensate formation in the heat exchanger, in particular in the intercooler. By adjusting the cover in the second position while the cross section through which the corresponding fluid flow into the tube bundle or can flow out of the tube bundle is reduced. This leads to a reduced heat exchange between the first fluid and the second fluid, so that in particular a reduced cooling of the fluid to be cooled, in particular the second fluid takes place. As a result, if external circumstances or boundary conditions are present, condensate formation in the heat exchanger is prevented or at least reduced.

The adjustment of the covering device between the first position and the second position thus takes place, in particular, depending on whether the formation of condensate threatens or is possible under the given thermodynamic conditions. Corresponding measures can be carried out depending on the inlet temperature and / or outlet temperature of the second fluid from the tube bundle or the heat exchanger. Likewise, it is conceivable to take into account the outside temperature and thus the temperature outside the heat exchanger. Also, for this purpose, the temperature of the first fluid, on the inlet side and / or outlet side of the heat exchanger can be taken into account.

For adjusting the covering device between the first position and the second position, the heat exchanger preferably has a control device.

In preferred embodiments, the control device has at least one temperature-dependent expansion element, which is arranged such that it adjusts the cover device depending on the temperature of at least one of the fluids. It is preferred if the expansion element is arranged on the outlet side of the tube bundle, so that an adjustment of the cover, in particular automatically, depending on the outlet temperature of the corresponding fluid from the tube bundle. It is particularly preferred if the covering device is also arranged on the outlet side of the tube bundle.

Also conceivable are embodiments in which the control device has at least one actuator for the mechanical adjustment of the covering device, for example an electric actuator, in particular a servomotor. Such an actuator makes it possible to adjust the cover more flexible, especially independent of temperatures and pressures.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

It show, each schematically

1 a highly simplified representation of a heat exchanger,

2 a greatly simplified, schematic diagram of a motor vehicle with such a heat exchanger,

3 a detail of a longitudinal view of the heat exchanger with a cover in a first position,

4 a cross section through the heat exchanger in another embodiment with the cover in the first position,

5 the view 3 in a second position of the cover of the heat exchanger 3 .

6 the view 4 in the second position of the cover of the heat exchanger 4 .

7 the view 4 in another embodiment of the heat exchanger in the first position of the cover,

8th the view 7 in the second position of the cover of the heat exchanger in a further embodiment,

9 a detailed view of the heat exchanger from the 3 - 7 in a cut,

10 the view 9 at the heat exchanger 8th .

11 a section through the heat exchanger in the first position of the cover device in a further embodiment,

12 the view 11 in the second position of the covering device of the heat exchanger,

13 the view 11 in a further embodiment of the heat exchanger,

14 the heat exchanger 15 in longitudinal section.

In 1 is a heat exchanger 1 shown in simplified form. The heat exchanger 1 has a housing 2 as well as two inlets 3 . 4 and two outlets 5 . 6 on. About a first inlet 3 a first fluid enters the heat exchanger 1 and flows from a first outlet 5 from the heat exchanger 1 , Via a second inlet 4 a second fluid enters the heat exchanger 1 and flows out of a second outlet 6 from the heat exchanger 1 , Thus it comes within the heat exchanger 1 for a heat exchange between the first fluid and the second fluid. The heat exchanger 1 can act as a charge air cooler 7 be educated.

2 shows the use of such, as intercooler 7 trained heat exchanger 1 , The heat exchanger 1 is in a fresh air plant 8th for supplying fresh air to an internal combustion engine 9 of a motor vehicle 44 arranged. In the fresh air system 8th is upstream of the heat exchanger 1 a compressor 10 provided for compressing the fresh air, so through the compressor 10 generated charge air to the heat exchanger 1 passes and is cooled there. The charge air may in particular be the second fluid which is cooled with the aid of the first fluid. The first fluid may be a coolant, in particular cooling air.

3 shows a section of a longitudinal section through the heat exchanger 1 , while 4 a cross section through the heat exchanger 1 in another embodiment shows. The heat exchanger 1 has a tube bundle 11 on that in 4 can be seen in a rear view. The tube bundle 11 has several tubes 12 on, extending in a longitudinal direction 13 extend and in the longitudinal direction 13 opposite floors 14 are included. The pipes 12 are flowed through by the first fluid. The pipes 12 are transverse to the longitudinal direction 13 spaced apart. Thus, between the neighboring pipes 12 flow-through channels 15 a channel system 16 formed for the second fluid, wherein the channels 15 in a direction transverse to the longitudinal direction 13 extending flow direction 17 can be flowed through. The tube bundle 11 thus has an inlet side for the second fluid 18 and an outlet side 19 on. In this case, channel cross sections form 20 of the channels 15 corresponding flow cross sections on the inlet side and outlet side 21 . 22 of the canal system 16 , That is, the channel system 16 at the tube bundle 11 inlet side an inlet-side flow cross-section 21 comprising, arising from the inlet-side channel cross-sections 20 of the channels 15 composed. Accordingly, the channel system 16 at the tube bundle 11 an outlet-side flow cross-section 22 arising from the outlet side channel cross sections 20 of the channels 15 composed. The tube bundle 11 also has an inlet side for the first fluid 45 and an outlet side 46 on that in 4 left or right of the tube bundle 11 are arranged, whereby a reverse arrangement is conceivable. In this case, inlet-side tube cross-sections form 47 the pipes 12 an inlet-side flow cross-section 48 the pipes 12 , while outlet-side pipe cross-sections 47 the pipes 12 an outlet-side flow cross-section 49 the pipes 12 form.

In the case 2 of the heat exchanger 1 is the outlet side 19 of the canal system 16 of tube bundle 11 adjacent a cover 23 arranged. The cover 23 can the assigned, adjacent flow cross section 22 of the canal system 16 cover at least partially. It is in the 3 and 4 a first position 24 the cover device shown.

5 corresponds to the representation of 3 , while 6 the representation of 4 equivalent. The difference between 5 and 3 respectively. 6 and 4 is that the covering 23 in a second position 25 you can see. It can be seen that the covering 23 in the first position 24 a smaller part of the associated, outlet-side flow cross-section 22 covering than in the second position 25 ,

The cover 23 is used to adjust between the first position 24 and the second position 25 translational in a translational direction 26 emotional. In the examples shown, the direction of translation runs 26 transverse to the longitudinal direction 13 the pipes 12 as well as across the flow direction 17 of the second fluid or in the direction of spacing of the tubes 12 ,

From the 3 to 6 shows that the cover 23 several of each other in the translation direction 26 spaced cover elements 27 which extends along the associated channel cross-sections 20 , In the example shown along the longitudinal direction 13 the pipes 12 , extend. The cover elements 27 are in the longitudinal direction 13 at the edge by connecting elements 28 connected with each other. Thus, the cover elements 27 together in translation direction 26 be moved or adjusted.

From the 3 to 6 also shows that the cover 27 in the first position 24 in translation direction 26 each with such a tube 12 while they are in the second position 25 at least partially overlapping with the associated pipe 12 in translation direction 26 adjacent channel cross-section 20 are arranged. This is to adjust the cover 23 between the first position 24 and the second position 25 only a short adjustment necessary, so that the covering 23 can be adjusted quickly or with short reaction times.

The main difference between those in the 3 and 5 or the 4 and 6 shown embodiments is that an element height 29 the cover elements 27 in translation direction 26 in the in the 3 and 5 shown embodiment is at least the same size as a translation direction 26 running channel height 30 of the assigned channel cross-section 20 , Accordingly, the assigned channel cross section 20 in the second position 25 in height entirely from the cover 27 covered. In addition, the element height corresponds 29 essentially one in the translation direction 26 running pipe height 31 of the associated pipe 21 , Thus, the respective cover element 27 in the first position 23 in translation direction 26 in overlap with the associated pipe 12 be brought, so aligned with the associated pipe 12 , In this embodiment, all pipes have 12 the same pipe height 31 while all assigned channel heights 30 also correspond to each other. In addition, the channel heights correspond 30 essentially the tube heights 31 ,

In the in the 4 and 6 embodiment shown is the element height 29 In contrast, smaller than the channel height 30 and as the pipe height 31 , Accordingly, the respective cover element 27 the assigned channel cross section 20 also in the first position 24 not completely cover in height. In this embodiment, the channel heights are 30 identical while the pipe heights 31 are also identical, with the channel heights 30 are larger than the pipe heights 31 ,

In the embodiments shown is in each channel 15 also a corrugated rib 32 arranged, leading to an enlargement of the heat exchanging surface of the heat exchanger 1 and / or turbulence generation in the second fluid. In addition, in the pipes 12 purely optional turbolators 50 arranged to generate turbulence in the first fluid and / or the heat exchanging surface of the heat exchanger 1 to enlarge.

In 7 is another embodiment of the heat exchanger 1 in the first position 24 shown. This embodiment differs from that in the 4 and 6 embodiment shown in particular in that the covering 23 not just two in the longitudinal direction 13 edge arranged connecting elements 28 , but also three between these marginally arranged connecting elements 28 other connecting elements 28 having, wherein the connecting elements 28 longitudinal 13 are arranged substantially equidistant. As a result, the stability of the cover 23 improved.

In 8th is another embodiment of the heat exchanger 1 in the second position 25 shown. This embodiment differs from that in the 4 and 6 embodiment shown in particular in that the covering 23 a first part 33 and a second part 34 having, wherein the parts 33 . 34 independently in translation direction 26 are adjustable. The respective part 33 . 34 of the cover 23 has two such cover elements 27 on, with the cover elements 27 of the respective part 33 . 34 with the help of two connecting elements 28 connected to each other. While the fasteners 28 of the second part 34 longitudinal 13 at the edge of the cover 23 are arranged, the connecting elements 28 of the first part 33 longitudinal 13 between the connecting elements 28 of the second part 34 arranged. Thus, the parts can 33 . 34 and consequently the associated cover elements 27 independently in translation direction 26 be translated translationally. This allows the associated flow cross section 22 variable cover. It can be the first part 33 and the second part 34 the covering device 23 transverse to the translation direction 26 , in particular in the flow direction 17 , offset from one another.

9 shows a section of the heat exchanger 1 according to the in the 3 to 7 shown embodiments. It can be seen that within the housing 2 (not shown) one of the ground 14 longitudinal 13 adjacent a guide groove 35 is arranged, in the longitudinal direction 13 is open. At the bottom shown 14 opposite ground 14 is an analogue guide groove 35 arranged (not shown). Here is the cover 23 in these opposite guide grooves 35 guided. It can also be seen that the guide groove 35 two in the longitudinal direction 13 protruding last 36 having. The strips 36 stabilize the cover 23 , in particular with respect to the flow of the second fluid.

In 10 the view is off 9 for the embodiment of the heat exchanger 1 out 8th shown. It can be seen that the ground shown 14 adjacent two such grooves 35 are arranged, in the flow direction 17 are spaced. It is one of the parts 33 the covering device 23 in one of the guide grooves 35 and the other part 34 in the other guide groove 35 guided.

In the embodiments shown above, the respective channel cross-section 20 the associated flow cross-section 22 such a cover 27 assigned.

In the 11 and 12 is another embodiment of the heat exchanger 1 shown. In this embodiment, the cover is 23 compared to those in the 3 to 6 shown embodiments in the region of the inlet-side flow cross-section 48 the pipes 12 provided, the 11 and 12 a side view of the tube bundle 11 on the inlet-side flow cross-section 48 the pipes 12 demonstrate. In this embodiment, therefore, by means of the cover 23 in the in 12 shown second position 25 a larger part of the inlet-side flow cross-section 48 covered as in the 11 shown first position 24 , Here is the cover 23 with such cover elements 27 provided in the translation direction 26 are spaced. The cover 23 and thus the cover elements 27 are for adjusting between the first position 24 and the second position 25 translational in translation direction 26 adjustable. The pipe cross sections 47 are essentially identical and thus each have the same pipe height 31 in translation direction 26 on. The channels 15 are essentially identical and thus each have the same channel height 30 on. The element height 29 the cover elements 27 corresponds at least to the pipe height 31 the assigned pipe cross-section 47 , In addition, the element height 29 the cover elements 27 maximum as high as the channel height 30 of the assigned channel 15 , where the element height 29 in this case, the channel height 30 of the assigned channel 15 equivalent. Analogous to in the 3 and 5 embodiment shown covers the respective cover 27 the assigned pipe cross-section 47 in the second position 25 while off in the first position 24 in translation direction 26 with the assigned, in translation direction 26 adjacent channel 15 Aligns and the associated pipe cross-section 47 completely releases.

In this embodiment, moreover, the number of cover elements 27 less than the number of tube cross sections 47 .. Due to the smaller number of cover elements 27 In this embodiment, at least one of the tube cross sections 47 also in the second position 25 the covering device 23 Approved.

In the exemplary embodiments shown so far, one is in the direction of translation 26 running distance 37 between in the translation direction 26 adjacent cover elements 27 at least the channel height 30 of the assigned channel cross-section 20 in the 3 to 8th or the pipe height 31 the assigned pipe cross-section 47 in the 11 and 12 , As a result, in the first position 24 the total associated flow cross section 22 be released.

In the 13 and 14 is another embodiment of the heat exchanger 1 shown. In this embodiment, the cover is 23 in the region of the inlet-side flow cross-section 48 the pipes 12 intended. In addition, the covering device 23 no single cover elements 27 on, which by a rigid connecting element 28 are connected to each other, but a cover 38 that in the in the 13 and 14 shown second position 25 at least two assigned pipe cross sections 47 covers. For better clarity, the cover is 38 in 13 hatched and transparent. The cover part 38 can thereby by a further translational adjustment in the translation direction 26 another number of tube cross sections 20 cover.

Especially 14 it can be seen that the cover 38 a plurality of hinged cover pieces 39 having, wherein the cover pieces 39 form a substantially closed surface.

Out 14 It is also apparent that the covering device 23 or the cover 38 the associated flow cross-section 48 adjacent and at one at the flow cross-section 48 subsequent top 40 of the tube bundle 11 is guided along. Thus, the heat exchanger 1 be made very compact. A corresponding guide the cover 23 can of course be synonymous with the in the 3 to 12 realize embodiments shown.

The cover 23 is used in particular to avoid the formation of condensate in the second fluid, in particular in the charge air. In this case, the covering 23 in the second position 25 adjusted if condensation is imminent. This threat can be based on thermodynamic parameters, such as the outlet temperature of the second fluid as the tube bundle 11 and / or the outside temperature outside the heat exchanger 1 and / or pressure conditions within the heat exchanger 1 to be determined.

To adjust the cover 23 preferably comes a control device 41 for use. The control device 41 can, as in 14 shown an actuator 42 , which is in particular electrically operated, having the covering device 23 between the first position 24 and the second position 25 adjusted.

It is also conceivable, the control device 41 with a temperature-dependent expansion element 43 , as in 7 indicated to provide that the covering 23 Temperature dependent, in particular depending on the outlet temperature of the second fluid from the tube bundle 11 , disguised.

In the embodiments shown, the tubes 12 and the channels 15 designed purely by way of example parallelepiped, so that the tube height 31 of the respective tube 12 is essentially constant while the channel height 30 of the respective channel 15 is essentially constant.

In the in the 3 to 8th The embodiments shown are the covering device 23 on the outlet side 18 of the tube bundle 11 and thus in the region of the outlet-side flow cross section 22 of the canal system 16 arranged. In the in the 11 to 14 The embodiments shown are the covering device 23 on the inlet side 45 of the tube bundle 11 and thus in the region of the inlet-side flow cross-section 48 the pipes 12 arranged. Of course it is also possible, the covering 23 or another similar covering device 23 also in the region of the inlet-side flow cross-section 21 of the canal system 16 and / or the outlet-side flow cross-section 49 the pipes 12 to arrange.

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• DE 102014105059 A1 [0004]
• DE 1020122004431 A1 [0005]
• DE 202014101948 U1 [0006]

Claims (15)

Heat exchanger ( 1 ), in particular a charge air cooler ( 7 ), with a tube bundle ( 11 ) comprising a plurality of tubes (A) through which a first fluid can flow ( 12 ), which are spaced from each other, wherein - the tubes ( 12 ) on the tube bundle ( 11 ) an inlet-side flow cross-section ( 48 ), which consists of inlet-side tube cross-sections ( 47 ) of the pipes ( 12 ), and an outlet-side flow cross-section ( 49 ), which consists of outlet-side tube cross sections ( 47 ) of the raw ( 12 ), - between the adjacent tubes ( 12 ) through-flow channels ( 15 ) of a channel system ( 16 ) are designed for a second fluid, - the channel system ( 16 ) on the tube bundle ( 11 ) an inlet-side flow cross-section ( 21 ), which consist of inlet-side channel cross-sections ( 20 ) of the channels ( 15 ), and an outlet-side flow cross-section ( 22 ), which consists of outlet-side channel cross-sections ( 20 ) of the channels ( 15 ), characterized in that - the heat exchanger ( 1 ) in the region of at least one of the flow cross sections ( 21 . 22 . 48 . 49 ) a covering device ( 23 ) for covering at least part of the at least one associated flow cross-section ( 21 . 22 . 48 . 49 ), - that the covering device ( 23 ) in a translation direction ( 26 ) translationally between a first position ( 24 ) and a second position ( 25 ) is adjustable and in the first position ( 24 ) a smaller part of the at least one associated flow cross-section ( 21 . 22 . 48 . 49 ) than in the second position ( 25 ). Heat exchanger according to claim 1, characterized in that the covering device ( 23 ) at least one cover part ( 38 ), which in the second position ( 25 ) at least two channel cross sections ( 20 ) and / or tube cross sections ( 47 ) covers. Heat exchanger according to claim 1 or 2, characterized in that the covering device ( 23 ) the at least one associated flow cross-section ( 21 . 22 . 48 . 49 ) adjacent and at one of the flow cross-section ( 21 . 22 . 48 . 49 ) subsequent top ( 40 ) of the tube bundle ( 11 ) is guided along. Heat exchanger according to one of claims 1 to 3, characterized in that the covering device ( 23 ) At least two of each other in the translation direction ( 26 ) spaced cover elements ( 27 ), which extend along the channel cross sections ( 20 ) and / or tube cross sections ( 47 ). Heat exchanger according to claim 4, characterized in that - the respective tube ( 12 ) one in the translation direction ( 26 ) running pipe height ( 31 ), - that the respective cover element ( 27 ) one in the translation direction ( 26 ) element height ( 29 ), the maximum of the pipe height ( 31 ), - that at least one such cover element ( 27 ) in the first position ( 24 ) in the translation direction ( 26 ) with such a pipe ( 12 ) is aligned, - that this at least one cover element ( 27 ) in the second position ( 25 ) in the translation direction ( 26 ) adjacent channel cross-section ( 20 ) at least partially covers. Heat exchanger according to claim 4 or 5, characterized in that - the respective channel ( 15 ) one in the translation direction ( 26 ) running channel height ( 30 ), - that the respective cover element ( 27 ) one in the translation direction ( 26 ) element height ( 29 ), the maximum of the channel height ( 30 ), - that at least one such cover element ( 27 ) in the first position ( 24 ) in the translation direction ( 26 ) with such a channel ( 15 ) is aligned, - that this at least one cover element ( 27 ) in the second position ( 25 ) in the translation direction ( 26 ) adjacent pipe cross-section ( 47 ) at least partially covers. Heat exchanger according to one of claims 4 to 6, characterized in that at least two such cover elements ( 27 ) are independently adjustable. Heat exchanger according to one of claims 4 to 7, characterized in that at least two such cover elements ( 27 ) by at least one connecting element ( 28 ) are interconnected. Heat exchanger according to one of claims 4 to 8, characterized in that the respective channel cross-section ( 20 ) one in the translation direction ( 26 ) running channel height ( 30 ) and at least one distance ( 37 ) between two adjacent cover elements ( 27 ) at least the channel height ( 30 ) corresponds. Heat exchanger according to one of claims 1 to 9, characterized in that the tube bundle ( 11 ) and the covering device ( 23 ) in a common housing ( 2 ) of the heat exchanger ( 1 ) are arranged. Heat exchanger according to claim 10, characterized in that the inside of the housing ( 2 ) two in the translation direction ( 26 ) extending and opposite guide grooves ( 35 ) are provided, in which the covering device ( 23 ) is guided. Heat exchanger according to claim 11, characterized in that on at least one of the guide grooves ( 35 ) two protruding strips ( 36 ) are arranged. Heat exchanger according to one of claims 1 to 12, characterized by a control device ( 41 ) for adjusting the covering device ( 23 ) between the first position ( 24 ) and the second position ( 25 ). Heat exchanger according to claim 13, characterized in that the control device ( 41 ) at least one temperature-dependent expansion element ( 43 ) which is arranged such that it covers the covering device ( 23 ) is adjusted depending on the temperature of the second fluid. Heat exchanger according to claim 13 or 14, characterized in that the control device ( 41 ) at least one, in particular electrical, actuator ( 42 ) for the mechanical adjustment of the covering device ( 23 ) having.

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