KR101704256B1 - Device for heat transfer - Google Patents

Abstract

The present invention particularly relates to a heat transfer device (1) for transferring heat between a first fluid and a second fluid. The apparatus 1 comprises a housing 1 having a housing 1 having a housing 1 having a housing 1 having a housing 1 having a housing 1 having a housing 1 having a housing 1 having therein a housing 1 having an inlet 6 and a connecting opening 4 having a discharge opening 7 and a connecting element 13 for a first fluid, And a closed housing (14) having a heat exchanger (2). The two-part housing 14 then comprises a receiving element 15 and a cover element 3, in which case the heat exchanger 2 is arranged in an integrated state within the receiving element 15.
The cover element 3 is tightly connected to the heat exchanger 2 and the connection assembly 4 to form one heat transfer-connection unit 16, in which case the cover element 3 has a rectangular shape And one through hole 11 is formed in each corner area. The cover element 3 also has a receiving opening 12 which is sized such that the connecting element 13 protrudes through the receiving opening 12 and into the opening formed in the heat exchanger 2, Is coincident with the opening formed in the heat exchanger (2) and the connecting element (13) of the connecting assembly (4).

Description

TECHNICAL FIELD [0001] The present invention relates to a heat transfer device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a heat transfer apparatus, particularly for a passenger car. At this time, the heat is preferably transferred between the liquid state fluid and the refrigerant. The apparatus includes a closed housing with a connecting assembly having an inlet and an outlet, a connecting element for the first fluid, and a heat transfer element disposed within the volume completely enclosed by the housing. The housing is formed of two parts, and has a receiving element and a cover element. The heat transfer unit is arranged in an integrated state inside the receiving element.

As the fluid in the liquid state, water or a water-glycol mixture which absorbs heat from the coolant or releases heat into the coolant may be used. As the refrigerant, carbon dioxide, which is also referred to as R744 or CO ₂ , is preferably used.

The prior art discloses an air conditioning system for a passenger car having a refrigerant circulation system and a heat transfer unit integrated in the refrigerant circulation system, in which case the heat transfer unit is used as an evaporator, on the one hand, And on the other hand as a condenser for heating fluid in a liquid state. A heat exchanger, on which refrigerant is on the one hand and liquid on the other hand, for example water or a water-glycol mixture, is also called a chiller.

When the evaporator is perfused, the refrigerant evaporates, and when the condenser is perfused, the refrigerant is liquefied. Thus, the condenser of the refrigerant circulation system is operated in a liquid-cooled state. The heat transfer between the fluid in the liquid state and the refrigerant takes place simultaneously with the phase change of the refrigerant.

In the refrigerant circulation system, conventional refrigerants such as R134a and 1234yf, which have much lower pressure than carbon dioxide, circulate.

Heat exchangers for refrigerants such as R134a and 1234yf, known in the prior art, are formed as plate heat exchangers. In this case, not only the liquid state fluid, which is also referred to as a coolant in the following, but also the refrigerant is guided through the plate. The coolant and the coolant respectively flow inside the plate. At this time, the plates made of thin aluminum plate or steel plate each correspond to the level of strength of the refrigerant at a predetermined pressure. If the heat transfer unit is operated as an evaporator, the internal operating pressure is about 4 bar, in which case the bursting pressure reaches about 31 bar. When the heat exchanger is operated as a condenser, so-called high pressure chiller, the internal operating pressure is about 18 bar and the burst pressure is about 60 bar.

For refrigerant R744, which plays an increasingly important role not only in terms of burst pressure but also in operating pressure and good environmental friendliness, it is about 10 times higher than in refrigerant R134a or 1234yf when the temperature requirements are the same. In the case of R744 application, the rupture pressure is set at about 260 bar for the evaporator and about 340 bar for the gas cooler.

For example, when operation is performed below the threshold using refrigerant R134a or when liquefaction of the refrigerant is achieved in certain ambient conditions using carbon dioxide, the heat transfer unit is termed a condenser. Part of the heat exchange takes place at a constant temperature. If the operation is made above the threshold value in the heat transfer or if the heat is discharged above the threshold, the temperature of the refrigerant is reduced constantly. In this case, the heat transfer unit is also referred to as a gas cooler.

In order to accommodate much higher strength requirements, the walls of the plate sheet may be formed with a much thicker thickness and / or from other materials such as special steels. However, heat exchangers made from thicker walls and / or special steels have very heavy weight and large installation space, and are very cost-intensive during manufacture and maintenance. The requirements for the coolant side are largely independent of the refrigerant used.

A European patent application EP 2 402 694 A1 proposes a heat exchanger for an automotive air conditioning system, which operates as a heat transfer device, in particular as a condenser. The condenser has a tube bundle and a housing for transferring heat between the refrigerant and the coolant, wherein the refrigerant is guided through tubes of the tube bundle, and the coolant is guided through the housing. The coolant flows around the tube from the outer surface. The tubes are in communication with the interior of the element, which is formed with the collector, respectively, at the ends. The heat transfer unit operates within a cross current. The material of the housing is plastic.

As a system known and known in the prior art, a heat exchanger which can operate substantially as a condenser or can operate as a gas cooler when carbon dioxide is present in excess of the threshold is used, in which case Heat is transferred from the refrigerant to the coolant. The heat exchanger is provided with a lamella disposed between the tubes of the tube bundle, which enlarges the heat exchange area at the outer surface of the tube and is in thermal contact with the tubes. Thin films formed from materials with very good thermal conductivity are in thermal contact with the tubes to enable thermal conduction. Thin films consist of metal, especially aluminum or steel, which are likewise preferably placed in contact with tubes made from the same material.

It is an object of the present invention to provide an apparatus for efficiently transferring heat between two fluids, in particular, between a refrigerant and a fluid in a liquid state as a coolant. Depending on the heat transfer, the maximum heat output must be able to be delivered when the size of the structure is minimal or when the space requirement is minimal. The fluids should only have as little pressure loss as possible when passing through the heat transfer unit. The heat transfer unit must be suitable for operation with carbon dioxide. In addition, the heat transfer unit must have a minimum weight and must cause minimal manufacturing and material costs. Leakage risk can be minimized.

At this time, the name "coolant" is not solely related to the heat transfer from the coolant to the coolant, or "cool" Heat transfer from the coolant to the refrigerant must likewise be possible.

This problem is solved by objects having the features of the independent patent claims. Improvements are described in the dependent patent claims.

The above problem is solved by a heat transfer device according to the invention, in particular an apparatus for transferring heat between a first fluid and a second fluid. The apparatus includes a connecting assembly with an inlet and an outlet, a connecting element for the first fluid, and a closed housing. A heat transfer device is disposed within the volume completely enclosed by the housing. The housing is formed of two parts with a receiving element and a cover element. At this time, the heat transfer unit is disposed in a state integrated in the receiving element.

According to the inventive concept, the cover element is tightly connected to the heat exchanger and the connection assembly to form one heat transfer-connection-unit. At this time, the cover elements have a rectangular shape and are formed in a state in which the through openings are provided in the edge regions. In addition, accommodating openings are provided in the cover element, and these accommodating openings are formed in such a manner that the opening formed in the heat exchanger and the connecting element of the connecting assembly, such that the connecting element protrudes into the openings formed in the heat- Lt; / RTI >

At this time, the fixed connection of the heat exchanger and the connection assembly to the cover element can be understood as a technically sealed zero-leakage coupling, resulting in the formation of additional sealing elements between the connecting elements of the connection assembly and the cover element no need. The connecting elements of the connecting assembly are the connections to the heat exchanger, which makes the mechanical connection as well as the fluid connection between the connecting assembly and the heat exchanger. As the first fluid, a refrigerant is used in particular.

The housing seals the heat exchanger in a hermetic sealing manner against the periphery, in which case a sealing element is preferably arranged between the receiving element and the cover element.

According to one refinement of the invention, the cover element is formed from metal, in particular aluminum, and is tightly and liquid-tightly connected to the connecting elements of the heat exchanger and the connecting assembly by soldering.

The cover element is preferably formed as a sheet having a reinforcement curved portion and is formed by a deep drawing process or a hydroforming process. At this time, the sheet is understood as a flat rolling tool finished product made of metal. The hydroforming process, also referred to as high-pressure forming, is considered as a process of deforming the sheet using pressure in a closed forming tool, which is generated, for example, by a water-oil-emulsion in the tool.

In accordance with a preferred embodiment of the present invention, the heat transfer units are formed from flat tubes spaced apart from one another, each of which extends between two collectors. At this time, the heat transfer unit is preferably disposed inside the housing so that heat can be transferred between the fluids in the area of the flat tube and the fluids in the area of the collector.

In another preferred embodiment of the present invention, the receiving element of the housing comprises a rib and a guide element for guiding the fluid to the intended position and for guiding and securing the heat exchanger. The ribs and guide elements are formed integrally with one inner surface of the receiving element.

At this time, the ribs are preferably disposed on the upper surface and the lower surface facing the upper surface, and the guide elements are disposed on the side opposite to each other of the receiving elements.

According to an improvement of the invention, the guide elements are arranged parallel to one another and extend across the length of one side of the receiving element, Are arranged in contact with each other in such a manner that The fluid-tight arrangement of the guide elements is used, among other things, to guide the fluid flowing between the housing and the heat exchanger as intended and to prevent leakage mass flow through the unwanted bypass.

According to yet another preferred embodiment of the present invention, apertures provided in the heat exchanger and coinciding with the connecting elements of the connecting assembly are arranged on one front side of one collector. At this time, the cover element is preferably arranged at the front of the collector, perpendicular to the longitudinal extension of the collector, and aligned in parallel with the flat tube.

Alternatively, the cover element may also be arranged in the heat transfer device in parallel with the longitudinal extension of the collector and perpendicular to the flat tube.

The receiving element of the housing is preferably formed as an integral element with a second fluid, in particular a connecting tube for the coolant. At this time, the receiving element is preferably made of plastics, preferably as an injection molded part, or formed from metal, especially aluminum.

According to another preferred embodiment of the present invention, the receiving element has a rectangular cross-section and an open side. At this time, a fixed receiving portion is formed in the edge region of the open side, and the fixed receiving portion is formed so that the fixing element can be inserted into the fixed receiving portion through the through-hole and the cover element can be firmly connected to the receiving element. Coincides with the through opening of the cover element.

According to an improvement of the present invention, the through openings of the cover element and the fixed receiving portion of the receiving element are the connection between the receiving element of the housing and the cover element, and the connection of the second fluid to the inlet and outlet of the first fluid Are symmetrically formed so that the alignment state of the receiving elements can be changed by rotation of the receiving element with respect to the cover element. The receiving element and the cover element are firmly connected to one another in the assembled state of the device, in which case the receiving element and the cover element are preferably screwed together. In this case, a screw is used as a fixing element.

According to alternative embodiments, the receiving element and the cover element are clamped, glued, welded or crimped together. At this time, the crimping bonding can be understood as a kind of folding-up bonding method, in which case the two components are connected to each other by the Sonic transformation.

A heat transfer device, which may preferably operate in purely cross flow or in countercurrent form or in combination with cross flow and countercurrent flow, may be integrated into the refrigerant circulation system according to one embodiment of the present invention, The transmitter is used to cool or heat the fluid in the cooling circulation system or the heating circulation system. At this time, the heat transfer unit can be used in different applications as a condenser, gas cooler or evaporator, for example as a refrigerant-provided charge air cooler, as an oil cooler or to cool electronic components. At this time, other media as a refrigerant and water, or a water-glycol-mixture such as oil or waste gas may also be used.

In summary, the heat transfer apparatus according to the present invention has the following various advantages:

- efficient transfer of heat between two fluids, in particular liquid refrigerant as coolant, and refrigerant,

- maximum heat output can be delivered if the size of the structure is minimal or if the space requirement is minimal, ie the ratio of deliverable heat output to the refitted volume is optimal,

In order to be particularly suitable for use in automobiles, and to be suitable for operation with carbon dioxide, not only at high pressures but also at low pressures, the use of flat tubes, in particular, fulfills the high level requirements for rupture pressure on the refrigerant side, The compressive strength is reached,

- have the minimum weight,

By using the standard flat tube profile of the R744-gas cooler and the R744-evaporator and by using rotatable housings to change the connection positions - two or more different connection positions when using the same sub-elements - The cost is minimized, the material cost is minimized,

A structure having a thin film for heat transfer on the coolant side and a structure having no such thin film can be used,

- Especially when a housing made of plastic is used, the corrosion resistance is high,

- can be modularly adapted to fluid combinations, and

A minimum number of sealing areas and a minimum sealing area are provided between the cover element and the closing element of the housing.

Other details, features and advantages of embodiments according to the present invention will be apparent from the following detailed description of embodiments with reference to the accompanying drawings. Explanation of drawings:
1 is an exploded view showing a heat exchanger, a cover element and a connection assembly as discrete components of a heat exchanger-connection-unit of a heat transfer apparatus,
2 is an exploded view of a heat exchanger, a cover element and a connection assembly as a heat exchanger-connection-unit of the heat transfer device shown in Fig. 1 in a soldered state and showing a receiving element and a sealing element of the housing,
Figure 3a is a schematic plan view showing a receiving element of a heat transfer device, in particular a housing with ribs and guide elements and a received heat transferer,
Figure 3b is a schematic plan view showing the receiving element of the housing with ribs and guide elements without heat transfer,
4A and 4B are schematic views showing a heat transfer device in a state in which the composition of the housing and the alignment state of the coolant connection tube are changed and assembled; and
Figure 5 is a schematic perspective view showing the receiving element of the housing of the heat transfer device.

1 , an exploded view of a heat exchanger 2, a cover element 3 and a connection assembly 4 as discrete components of a heat exchanger-connection unit 16 of a heat transfer device is shown.

The heat exchanger (2) is formed from a flat tube (9) arranged in parallel with each other. In this case, the flat tubes 9 are aligned with respect to each other by the wide sides, resulting in one flow path for the fluid, in particular one for the coolant, directly between the neighboring flat tubes 9 . The flat tubes 9 each extend between two collectors 8. The inner volume of the flat tube (9) is connected to the inner volume of the collector (8).

In the intermediate space of the adjacently disposed flat tube 9, there is disposed a device 10, for example a thin film, for changing the flow cross-section and / or for enlarging the heat transfer area.

As the element 10 for changing the flow cross-section and / or for enlarging the heat transfer area, a thin film which is known for the condenser or evaporator or a thin film which is optimized for transferring heat with water can be used. Alternatively, a rib may also be used. The device 10 is formed from a material that is highly thermally conductive, such as, for example, aluminum, or plastic or other materials of low density.

In the case of designing the size of the device based on the flow of coolant characterized by the sizeless Reynolds number, the device 10 can be used only to increase the flow rate only or to increase turbulent formation of the coolant .

The coolant is guided through the intermediate space between the flat tubes 9 and around the element 10 to change the flow cross-section of the flow path. The collector 8 of the heat exchanger 2 is also circulated by the coolant so that the collector 8 is also involved in the heat transfer between the coolant and the coolant.

It is not necessary that the element 10 for changing the flow cross-section of the flow path formed between the flat tubes 9 be firmly connected to the flat tube 9, for example by soldering. However, in embodiments with a thin film for increasing the heat transfer area, a rigid and thermally conductive connection of the flat tube 9 and the element 10 may be provided to further increase the output of the heat exchanger 2 . If the shape of the collector 8 in which all of the extruded flat tubes 9 or the flat tube profiles are soldered therein is appropriate, the spacing of the flat tubes 9 can be further reduced and minimized, As a result, such an embodiment is formed without a thin film.

The element 10 may alternatively also be arranged purely as a vortex generator which is preferably made of the same material as the housing 11 surrounding the heat exchanger 2, From the same metal or from other suitable materials of low density.

The vortex generators are used only to improve the flow velocity or the turbulence formation of the coolant and thereby to improve the heat transfer on the coolant side in order to substantially change the flow cross-section or only to flow through the flow path between the flat tubes 9.

The heat exchanger 2 formed as the extruded flat tube heat exchanger from the flat tube 9 is formed in a single row or a plurality of rows depending on the output requirements and is of a size, It is scalable in width. At this time, the use of a known evaporator or condenser / gas cooler for R744 is contemplated.

In a state where the heat exchanger-connection unit 16 is engaged, the cover element 3 is arranged on the narrow side of the heat exchanger 2.

According to an alternative embodiment not shown in the figures, the cover element is arranged on the longitudinal side of the heat exchanger.

The cover element 3 is formed as a deep drawing portion or a hydroforming portion having a reinforcing curved portion in the form of a rectangular sheet made of metal, particularly aluminum. This reinforcement curvature is used to withstand the coolant side pressure in the foreground.

In the edge regions, the cover elements 3 are rounded, and each has one through hole 15. In the edge region, the cover element 3 is also formed in the form of having a receiving opening 12. The receiving opening 12 coincides with the opening provided on the one hand in the collector 8 of the heat exchanger 2 and on the other hand with the connecting element 13 of the connecting assembly 4.

The connecting assembly 4 has an inlet 6 and an outlet 7 for the refrigerant as connections to the collector 8 of the heat exchanger 2 in addition to the connecting elements 13, Flows through the inlet (6) and the outlet (7) to the outlet (5). At this time the connecting element 13 creates a mechanical and refrigerant side connection between the connecting assembly 4 and the heat exchanger 2 in the assembled state of the heat exchanger- The refrigerant is guided from the inlet 6 to the first connecting element 13 through the delivery line and from the second connecting element 13 to the outlet 7 and flows through the outlet 7 at 90 ° Direction.

The inlet 6 and the outlet 7 are connections of a refrigerant circulation system, for example a heat exchanger-connection unit 16 to a refrigerant line of an automotive air conditioning system.

At this time also an inlet 6 and an outlet 7 for the refrigerant are provided in opposite flow directions 5 respectively so that the refrigerant line is connected to the heat exchanger 2 so that the inlet 6 and the outlet 7 are interchanged, Or the flow direction 5 of the refrigerant can be aligned.

Before finally assembling the heat transfer device 1, the heat exchanger 2, the cover element 3 and the connection assembly 4 are connected to the heat transfer-connection-unit 16, .

2 shows the heat exchanger-connection unit 16 of the heat transfer device 1 shown in Fig. 1 connected from the heat exchanger 2, the cover element 3 and the connection assembly 4 in a soldered state And the housing element 15 and the sealing element 17 of the housing 14 in an exploded view.

The cover element 3 is formed as a part of the housing 14 so as to be firmly connected to the heat exchanger 2. At this time, the cover element 3 is soldered, bonded, welded or crimped to the heat exchanger 2. As a result, the connection element 13 and the cover element 3 for the inlet 6 and outlet 7 of the refrigerant can be understood as a fixed-connection, in particular a soldered or welded connection, There is no need to provide additional sealing sites.

The cover element 3 of the housing 14 is preferably made of aluminum and is connected in a liquid-tight manner to the heat exchanger 2 by soldering. This avoids the complicated formation of the seal at the inlet (6) and outlet (7) of the refrigerant, in particular at the connection element (13) for carbon dioxide. The cover element 3 is arranged on the heat exchanger 2 on a narrow side of the collector 8, perpendicular to the collector 8 and aligned parallel to the flat tube 9.

This allows the soldering of the individual components to the heat exchanger-connection unit 16, namely the heat exchanger 2, the cover element 3 and the connection assembly 4, without the additional sealing element, ) Of the refrigerant tube through the housing 14 because the connecting element 13 is soldered to the cover element 3 as a penetrating portion of the refrigerant tube in a sealing manner. Soldering the perforations by a coolant seal method prevents situations where the coolant leaks from the device 1 to the periphery.

The housing 14 formed of two parts has, in addition to the cover element 13, a receiving element 15 in the form of a trough having an open side. The cover element 3 is formed so as to completely surround the volume in combination with the receiving element 15. In a state in which the device 1 is assembled, the receiving element 15 and the cover element 3 coincide with each other. Two elements of the housing 14, that is, the receiving element 15 and the cover element 3 can be simply combined and mounted.

At this time, the receiving element 15 having a substantially rectangular cross section is formed at the open side in the edge region having the fixed receiving portion 19, for example, a screw connection portion. The through hole 11 and the fixed accommodation portion 19 are stacked up and down in the fixed accommodation portion 19 of the accommodation element 15 in the state in which the apparatus 1 is assembled, The cover element 3 and the receiving element 15 can be inserted into the fixed receiving portion 19 through the through opening 11 by means of the shaft so that the cover element 3 and the receiving element 15 can be tightly connected to each other. The through-hole 11 of the second through-hole 11a. The housing 14 is closed by a screw connection. By using a screw for self-grooving as the fastening element 18, additional elements such as, for example, threaded sleeves, which can be made complex, can be omitted, And further reduces costs.

The receiving element 15 and the cover element 3 of the housing 14 can also be closed by crimping instead of the connection of the housing 14 using screws.

The fixing element 18 is arranged on the four corners of the housing 14, that is, on the open side of the receiving element 15, so that it is possible to operate even at the maximum possible pressure and maximum compressive strength.

The receiving element 15 is preferably formed from plastic and is connected to the cover element 3 by screwing or crimping and is sealed to the periphery by a sealing element 17, which is formed as a sealing ring, do. The sealing element 17 is arranged between the cover element 3 and the cover element 3 before the cover element 3 as a component of the heat exchanger-connection unit 16, in particular, And is disposed between the receiving elements 15.

Alternatively, the receiving element 15 may also be formed from a metal, for example aluminum, and may be soldered to the heat exchanger 2. At this time, the sealing groove in the receiving element 15 is adapted as a supporting surface for the cover element 3. The sealing element 17 is omitted. The individual components of the device 1 are joined and fixed, for example by soldering frames, and then subsequently soldered together.

The heat exchanger 2 is disposed within the housing 14, that is, inside the volume surrounded by the housing 14. The housing 14 seals the heat exchanger 2 in a hermetically sealed manner to the periphery. During operation of the device (1), the refrigerant flows inside the heat exchanger (2). The refrigerant flows in the flow direction (5) through the inlet (6) and into the heat exchanger (2) and is discharged through the outlet (7). In addition, the heat exchanger 2 is circulated by a liquid-state fluid, in particular by a coolant, for example water or a water-glycol-mixture. The coolant is directed into the intermediate space at the outer surface of the heat exchanger 2 and between the inner surface 23 of the housing 14 and the heat exchanger 2 in the flow direction 22, Flows through.

Depending on the shape of the housing 14, the coolant is guided along the outer surface of the heat exchanger 2 as intended. The housing 14 defines that the coolant flows through the heat exchanger 2 in the flow direction 22. At this time, the housing 14 guides the coolant through the intermediate space formed between the flat tubes 9 and guides around the element 10 and the collector 8 to change the flow cross-section of the flow path.

The housing 14 has two connection tubes 20 and 21 for introducing and discharging the coolant, which are disposed in the receiving element 15. The connection tubes 20 and 21 can be positioned at any position of the receiving element 15. [ The coolant flows into the apparatus 1 through the inlet 20 and is discharged again from the apparatus 1 through the outlet 21.

At this time an inlet 20 and an outlet 21 for the coolant are provided in opposite flow directions 22 respectively so that the coolant line of the coolant circulation system is connected to the device 1 so that the inlet 20 and the outlet 21 are interchanged. Or the flow direction 22 of the coolant may be aligned.

The receiving element 15 is formed as an integral element together with the connecting tubes 20 and 21, in particular as an injection-molded part. Since the receiving element 15 and the connecting tubes 20 and 21 are integrally formed, the use of another sealing element is avoided.

The connection between the heat exchanger-connection unit 16, in particular the cover element 3 and the receiving element 15 of the housing 14, is symmetrically formed so that the heat exchanger-connection unit 16, And the receiving element 15 relative to each other can also be used for various positions of the connecting pipes 20 and 21 with respect to the inlet 6 and the outlet 7 of the refrigerant without changing the components of the housing 14. [ .

The coolant is guided as a liquid medium, preferably in a countercurrent form, preferably with respect to the direction of flow 5 of the coolant, but alternatively may also pass through the housing 14 in the form of a cross flow to the coolant or in a cross- And may be guided.

The coolant is introduced into the housing 14 and into the flat tubes of the heat exchanger 2 as intended by the guide element 25 and the ribs 24 disposed on the inner surface 23 of the housing 14. [ Is guided through an intermediate space formed between the first and second plates (9).

At this time, the refrigerant flows into the heat exchanger 2 in the refrigerant flow direction 5 through the inlet 6 of the connection assembly 4 and is distributed to the flat tube 9 in the first collector 8 do. The refrigerant then flows through the extruded flat tube 9 to the second collector 8b and is collected and discharged from the heat exchanger 2 through the outlet 7 of the connection assembly 4. [

The flat tubes 9, which have a wide side and are arranged parallel to each other, and which extend between two collectors 8, respectively, are arranged between direct neighboring tubes 9, The paths are arranged to be created. Inside the flow path is formed an element 10 for changing the flow cross-section and / or for enlarging the heat transfer area.

At this time, the refrigerant flows inside the flat tube 9, and the refrigerant flows in a countercurrent manner in a limited flow path by the adjacent flat tube 9. The coolant also circulates through the collector 8 provided with the coolant before it is introduced into the flow path and after it is discharged from the flow path.

Figures 3a and 3b show the receiving element 15 of the housing 14 with the heat transfer device 1, in particular a guide element 25 for guiding the flow of the coolant and a rib 24, With the heat exchanger 2 disposed in the receiving element 15 and with the heat exchanger 2 in the absence of the heat exchanger 2 according to Figure 3b.

After the coolant flows in the flow direction 22 through the inlet 20 and the coolant is distributed to the provided heat exchanger 2, the coolant flows substantially perpendicular to the flat tube 9, Is redirected in the direction of the flat tube 9 in the lower region of the housing 14 before it is newly turned by 90 and is again discharged through the outlet 21 in the direction perpendicular to the flat tube 9, And flows in parallel with the flat tube 9. Thereby, the heat exchanger 2 is operated as a cross-reflux-heat exchanger. The flow guide of the coolant may additionally be influenced through a baffle plate formed between the elements 10 to change the flow cross-section and / or to increase the heat transfer area.

In particular on the upper and lower surfaces of the housing element 15 to separate and redirect coolant flow paths through the housing 14 and bypassing the heat exchanger 2, A plurality of guide elements 25 are formed on the inner surface 23 of the housing 14 in addition to the rib 24 for indicating the intended direction. At this time, the expression 'plural' can be understood as three or more prime number of guide elements 25.

The guide element 25 is configured to receive the heat exchanger 2 when assembling the receiving element 15 and the heat exchanger-connection unit 16, among other things besides influencing the coolant flow through the housing 14. [ Is used to secure the heat exchanger 2 within the receiving element 15 and to stabilize the housing 14 for guidance. At this time the guide elements 25 extending in the direction of the collector 8 from one longitudinal side of the heat exchanger 2 and aligned parallel to one another are in sealing contact with the collector 8 of the heat exchanger 2 . A flow channel for the coolant is formed on the one hand by the guide element 25 in sealing manner on the collector 8 and on the inner surface 23 of the housing 14 and on the other hand the housing 14 The leakage mass flow of the coolant through the undesirable bypass inside the heat exchanger (2), especially the leakage mass flow bypassing the heat exchanger (2), is avoided.

As the guide element 25 is formed in the housing 14, in particular integrated with the receiving element 15, like the rib 24, no additional sealing element or flow guide element is required as a result. When the device 1 is assembled to the ribs 24 and the guide elements 25 in a press fitting manner, the heat exchanger 2 is arranged in the receiving element 15 of the housing 14 And this arrangement allows a very good seal between the guide element 25 and the rib 24 on the heat exchanger 2 side. The ribs 24 and the guide elements 25 are easily deformed during assembly so that the sealing condition is ensured by the ribs 24 and the guide elements 25 under stress or pressure.

When using the heat exchanger 2 provided with the refrigerant at low pressure, the flow direction of the refrigerant and the coolant can be freely selected because it has little or no effect on the output to be delivered.

In particular, in the case of the embodiment in which the housing element 15 is made of plastic, the installation space is reduced by forming a slope for separation from the mold, so that the side guide elements 25 are integrated into the inner surface 23 of the housing 14 do. Here, the 'slope for separating from the mold' can be understood as a constriction of the receiving element 15 for disassembling from the tool after completion. By such a narrowed portion, the receiving element 15 is aligned toward the cover element 3 and has a larger cross-section at the closed end, which is opposed to the open end. The additional volume associated with the larger cross-section is compensated by the guide element 25, in order to avoid that the ribs which enlarge the outer dimensions of the cover element 3 are formed on the outer surface.

The ratio between the width of the transverse section of the receiving element 15 and the height lies in the range of 1.2 to 1.4 on the basis of the maximum cooling power.

4A and 4B show a state in which the composition of the housing 14 and the state of alignment of the coolant connecting pipes 20 and 21 with respect to the coolant inlet port 6 and the coolant outlet port 7 are changed, (1) respectively.

The housing 14 is at least partly symmetrical at least partially in the connecting area of the through opening 11 and the cover element 3 and in the connecting area of the fixed receiving part 19 and the sealing element 17 and the receiving element 15 Respectively. The symmetrical formation of such components is achieved by rotating the heat transfer-connection unit 16 with respect to each other by 90 ° or 180 ° with the cover element 3 and the receiving element 15, respectively, And the outlet 7, the various positions of the connecting pipes 20, 21 are possible. Thus, the connecting tubes 20, 21 and the inlet 6 and outlet 7 of the refrigerant can be arranged differently by merely changing the assembly state in steps of 90 ° relative to each other using the same components Such a situation enables a flexible configuration of the device 1 and a different embodiment of the device 1 with it, while at the same time reducing costs.

In Fig. 5 , the receiving element 15 of the housing 14 of the heat transfer apparatus 1 is shown as a separate element in a perspective view.

The receiving element 15 is preferably an injection molded part in which the connecting tubes 20 and 21 are integrated from plastic, and is formed as an integral element. The provision of the additional sealing element which increases the risk of the leakage of the coolant to the periphery and causes additional cost in the manufacture and management of the device 1 by integrally forming the housing element 15 and the connecting tubes 20, .

The soldering of the individual components, namely the heat exchanger 2, the cover element 3 and the connection assembly 4 to the heat transfer-connection-unit 16 can also be achieved by connecting the connection elements 13 The housing 14 is closed only in the area passing through the sealing element 17 which is disposed between the cover element 3 and the receiving element 15 because it does not require the use of a separate sealing part for sealing the cover element 3 .

The forming of the housing 14, in particular of the receiving element 15 from plastic, also results in a very high corrosion resistance and the minimum weight of the housing 14 and the device 1 with it.

The connecting tubes 20, 21 have a constant circular cross-section in the flow direction 22, in a plane perpendicular to the flow direction 22.

A bead extending along a longitudinal edge from four corners of an open side having a rectangular cross section of the gutter receiving element 15 and being arranged substantially perpendicular to the plane of the rectangular cross section of the open side 26 are used to reinforce the receiving element 15 and to reduce installation space and thereby save space.

5, a holder integrated element 27 formed of a screw dome is arranged on the side having the connecting pipes 20, 21 for the coolant. The holder integrated element 27 is fixed to the receiving element 15 of the housing 14 in order to connect the receiving element 15 of the housing 14 and the fixed portion, And is preferably formed as a direct threaded connection similar to the fixed receiving portion 19. Alternatively, the holder integration element 27 may also have a helical sleeve formed within the plastic.

1: Device
2: Heat transfer
3: Cover element
4: connection assembly
5: direction of refrigerant flow
6: Refrigerant inlet
7: Refrigerant outlet
8: Collector
9: Flat tube
10: Device
11: Through opening
12: receptacle opening
13; Connecting element
14: Housing
15:
16: Heat exchanger - connection-unit
17: housing (14) sealing element
18: Fixed element
19: Fixed reception part
20: connector, refrigerant inlet
21: Connector, refrigerant outlet
22: direction of refrigerant flow
23: the inner surface of the housing 14
24: rib
25: Guide element
26: Bead
27: Holder integrated element

Claims (10)

Having a connecting assembly 4 having an inlet 6 and an outlet 7, a connecting element 13 for a first fluid and a heat exchanger 2 disposed inside the volume completely enclosed by the housing 14 And a cover element (3), said heat exchanger (2) having a housing element (14), wherein said housing (14) is formed in two parts, (1) for transferring heat between a first fluid and a second fluid, the heat transfer device (1)
The cover element 3 is tightly connected to the heat exchanger 2 and the connection assembly 4 to form one heat transfer-connection unit 16,
The cover element (3)
- having a rectangular shape, having through openings (11) formed in corner areas, respectively, and
A receiving opening 12 is defined in the heat exchanger 2 so that the connecting element 13 penetrates the receiving opening 12 and protrudes into the opening formed in the heat exchanger 2. [ (13) of the connecting assembly (4), and an opening formed in the connecting element (4). The method according to claim 1,
Characterized in that the cover element (3) is formed from a metal and is connected in a liquid-tight manner to the connecting element (13) and the heat exchanger (2) of the connecting assembly (4) (1). 3. The method according to claim 1 or 2,
Characterized in that the cover element (3) is formed as a sheet metal with a reinforcement curvature and is formed by deep drawing or hydroforming. 3. The method according to claim 1 or 2,
The heat exchanger (2)
- a flat tube (9) arranged at a distance from each other, said flat tubes (9) each extending between two collectors (8), and
Characterized in that the heat transfer device (1) is arranged to transfer heat between the fluids in the region of the flat tube (9) and in the region of the collector (8). 3. The method according to claim 1 or 2,
The receiving element 15 of the housing 14 has a rib 24 and a guide element 25 for guiding the fluid as intended and for guiding and fixing the heat exchanger 2 Characterized in that the ribs (24) and the guide elements (25) are integrally formed on one inner surface (23) of the receiving element (15). 6. The method of claim 5,
The guide elements 25 are arranged in parallel with respect to each other and extend over a length of one side of the receiving element 15 and are in contact with the collector 8 at one longitudinal side of the heat exchanger 2, And arranged in contact with the collector (8) in fluid sealing manner. 5. The method of claim 4,
The openings corresponding to the connecting elements 13 of the connecting assembly 4 are arranged in one side of the collector 8 in the heat exchanger 2, Characterized in that the heat exchanger (2) is arranged in the heat exchanger (2) at the front of the collector (8), aligned perpendicular to the collector (8) and parallel to the flat tube (1). 3. The method according to claim 1 or 2,
Characterized in that the receiving element (15) of the housing (14) forms an integral element with the connecting tubes (20, 21) for the second fluid. 3. The method according to claim 1 or 2,
The holding element (15) has a rectangular cross section and an open side, and a fixed receiving portion (19) is formed in an edge area of the opened side, The through-hole 11 of the cover element 3 is formed so that it can be inserted into the fixed receiving portion 19 through the opening 11 and the cover element 3 can be firmly connected to the receiving element 15. [ (1). ≪ / RTI > 10. The method of claim 9,
The through-hole 11 of the cover element 3 and the fixed receiving portion 19 of the receiving element 15 are connected to each other by a connection of the second fluid with reference to the inlet 6 and the outlet 7 of the first fluid, The cover element 3 and the receiving element 15 of the housing 14 are arranged so that the alignment state of the tubes 20 and 21 can be changed by rotation of the receiving element 15 with respect to the cover element 3. [ , And the connection part is formed symmetrically as a connecting part between the heat transfer parts (1) and (2).

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