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CN-115704656-B - Heat exchanger

CN115704656BCN 115704656 BCN115704656 BCN 115704656BCN-115704656-B

Abstract

The invention relates to a heat exchanger (1) in a disk-type structure, in which disks (2) are stacked on top of one another in a stack (3) and are connected to one another in a sealed manner, wherein fluid channels (4) are formed between the respective adjacently arranged disks (2), wherein the stack (3) of disks (2) is divided into a first stack region (5) and a second stack region (6), wherein the first stack region (5) forms an evaporator (9) together with the first fluid channel (7) and the second fluid channel (8) and the second stack region (6) forms an internal heat exchanger (10) together with the third fluid channel (11) and the fourth fluid channel (12).

Inventors

  • Timo Fieldkeller

Assignees

  • 马勒国际公司

Dates

Publication Date
20260508
Application Date
20220722
Priority Date
20210813

Claims (16)

  1. 1. A heat exchanger (1) of disc-type construction, in which the discs (2) are stacked on top of each other in a stack (3) and sealingly connected to each other, wherein fluid channels (4) are formed between the respective adjacently arranged discs (2), characterized in that the stack (3) of discs (2) is divided into a first stack region (5) and a second stack region (6), wherein the first stack region (5) together with a first fluid channel (7) and a second fluid channel (8) forms an evaporator (9) and the second stack region (6) together with a third fluid channel (11) and a fourth fluid channel (12) forms an internal heat exchanger (10), the first stack region (5) being designed in such a way that the first fluid channel (7) is designed for the flow of refrigerant and the second fluid channel (8) is designed for the flow of coolant, wherein the second stack region (6) is designed in such a way that the third fluid channel (11) is designed for the flow of the first refrigerant in the state and the fourth fluid channel (12) is designed for the flow of the second refrigerant in the state.
  2. 2. Heat exchanger (1) according to claim 1, characterized in that the first stacking zone (5) has a first connection (13) for supplying the refrigerant and a second connection (14) for supplying the refrigerant, and the first stacking zone (5) has a third connection (15) for leading out the refrigerant and a fourth connection (16) for leading out the refrigerant, wherein the second stacking zone (6) has a fifth connection (17) for supplying the refrigerant in the first state and a sixth connection (18) for supplying the refrigerant in the second state, and the second stacking zone (6) has a seventh connection (19) for leading out the refrigerant in the first state and an eighth connection (20) for leading out the refrigerant in the second state.
  3. 3. Heat exchanger (1) according to claim 2, characterized in that an expansion mechanism (21) is further provided for expanding the refrigerant, wherein the expansion mechanism (21) has a ninth connection end (22) for supplying the refrigerant to the expansion mechanism (21) and the expansion mechanism has a tenth connection end (23) for leading the refrigerant out of the expansion mechanism (21).
  4. 4. A heat exchanger (1) according to claim 3, characterized in that the first connection (13) is for supplying the first fluid channel (7) with the refrigerant and the third connection (15) is for deriving the refrigerant from the first fluid channel (7), wherein the second connection (14) is for supplying the second fluid channel (8) with the refrigerant and the fourth connection (16) is for deriving the refrigerant from the second fluid channel (8), wherein the fifth connection (17) is for supplying the third fluid channel (11) with the refrigerant in the first state and the seventh connection (19) is for deriving the refrigerant from the third fluid channel (11) in the first state, wherein the sixth connection (18) is for supplying the fourth fluid channel (12) with the refrigerant in the second state and the eighth connection (20) is for deriving the refrigerant from the fourth fluid channel (12) in the second state.
  5. 5. Heat exchanger (1) according to claim 4, wherein the seventh connection end (19) is in fluid connection with the ninth connection end (22) so that the refrigerant in the first state can flow into the expansion mechanism (21), wherein the tenth connection end (23) is in fluid connection with the first connection end (13) so that the refrigerant in the expansion mechanism (21) can flow into the first fluid channel (7), wherein the third connection end (15) is in fluid connection with the sixth connection end (18) so that the refrigerant in the first fluid channel (7) can flow into the fourth fluid channel (12) as the refrigerant in the second state.
  6. 6. Heat exchanger (1) according to claim 5, characterized in that the first connection end (13) is designed as an opening in a tray (2) in the transition of the first stacking zone (5) to the second stacking zone (6), the third connection end (15) is designed as an opening in a tray (2) in the transition of the first stacking zone (5) to the second stacking zone (6), and the sixth connection end (18) is designed as an opening in a tray (2) in the transition of the first stacking zone (5) to the second stacking zone (6).
  7. 7. Heat exchanger (1) according to claim 2, characterized in that the fifth connection end (17) and/or the eighth connection end (20) and/or the seventh connection end (19) are designed as openings and/or pipe connectors and/or flanges on the second stacking zone (6).
  8. 8. Heat exchanger (1) according to claim 2, characterized in that the second connection end (14) and/or the fourth connection end (16) are designed as openings and/or pipe connectors and/or flanges on the first stacking zone (5).
  9. 9. A heat exchanger (1) according to claim 3, characterized in that the ninth connection end (22) and/or the tenth connection end (23) are designed as openings and/or pipe fittings and/or flanges on the expansion means (21).
  10. 10. A heat exchanger (1) according to claim 3, characterized in that the expansion means (21) are fixedly connected to the stack (3) of discs (2).
  11. 11. Heat exchanger (1) according to claim 10, characterized in that the expansion means (21) are fixedly connected to the second stacking zone (6).
  12. 12. Heat exchanger (1) according to claim 10, characterized in that the seventh connection end (19) is arranged opposite the ninth connection end (22).
  13. 13. A heat exchanger (1) according to claim 3, wherein the tenth connection end (23) is fluidly connected to the first connection end (13) by means of a connection channel (24).
  14. 14. Heat exchanger (1) according to claim 13, characterized in that the connecting channel (24) passes through the second stacking zone (6).
  15. 15. Heat exchanger (1) according to claim 14, characterized in that the connecting channel (24) is designed as a dip tube through the second stacking zone (6).
  16. 16. Heat exchanger (1) according to claim 1 or 2, characterized in that the first fluid channel (7) is designed to be single-flow, double-flow, three-flow or more and/or the second fluid channel (8) is designed to be single-flow, double-flow, three-flow or more and/or the third fluid channel (11) is designed to be single-flow, double-flow, three-flow or more and/or the fourth fluid channel (12) is designed to be single-flow, double-flow, three-flow or more.

Description

Heat exchanger Technical Field The present invention relates to a heat exchanger, in particular for a refrigerant circuit of a motor vehicle. Background Refrigerant circuits in which a condenser, an expansion valve and an evaporator and a compressor are connected to each other to form a circuit are known in motor vehicles. In this case, the liquid refrigerant from the condenser is expanded and cooled in the expansion valve and evaporated in the evaporator, wherein heat transfer between the refrigerant and the coolant takes place in the evaporator, so that the refrigerant is evaporated at the output of the evaporator relative to the input of the evaporator and is in most cases also heated to at least some extent, while the coolant is already cooled at the output of the evaporator. The terms "evaporator" and "refrigerator (Chiller)" are used synonymously herein below. Here, for example, air, water or a mixture of water can be used as the coolant for the evaporator. The condenser again cools the refrigerant compressed and heated by the compressor by heat transfer with another fluid (e.g., also air, water or a mixture of water) and condenses the refrigerant from the compressor, causing the refrigerant to leave the condenser in a liquid state. In particular, in electric vehicles, the efficiency is very important because of the limited range provided by the vehicle battery, and thus the internal heat exchanger is of particular interest. In the refrigerant circuit, such an internal heat exchanger directs the hotter refrigerant from the condenser in heat transfer with the colder refrigerant from the evaporator such that the hotter refrigerant from the condenser is pre-cooled and thus cooled at least to some extent by heat transfer with the colder refrigerant from the evaporator, which is heated at least to some extent by heat transfer. This promotes an increase in the efficiency of the refrigerant circuit, thereby indirectly positively affecting the range of the electric vehicle. The term "electric vehicle" is understood here to mean a motor vehicle which is permitted to run by means of an electric motor. This means not only motor vehicles which run purely electrically, but also motor vehicles which have, for example, a hybrid drive, and in which electric and non-electric drive, for example, by means of an internal combustion engine or the like, can be achieved. However, the costs for assembling the evaporator and the internal heat exchanger in the refrigerant circuit are relatively high, since the two heat exchangers have to be manufactured separately, assembled separately and have to be connected to each other and integrated into the refrigerant circuit by means of lines or hose lines. This increases the assembly and logistical costs and also increases the installation space requirements in the case of internal heat exchangers, so that longer lines or hose lines may be required, which in turn increases the costs. As a result, many vehicle manufacturers forego the use of internal heat exchangers for cost and space reasons. Disclosure of Invention The object of the present invention is to provide a heat exchanger which is improved over the prior art and which allows efficient operation of motor vehicles, in particular electric vehicles. This object is achieved by the following features. Embodiments of the invention relate to a heat exchanger in a disc-type structure, in which the discs are stacked on top of each other and sealingly connected to each other, wherein fluid channels are formed between the respective adjacently arranged discs, wherein the stack of discs is divided into a first stack area and a second stack area, wherein the first stack area forms an evaporator together with the first fluid channel and the second stack area forms an internal heat exchanger together with the third fluid channel and the fourth fluid channel. In this way, a compact heat exchanger is achieved in a small installation space, which forms both the evaporator and the internal heat exchanger, wherein the fluid transition between the evaporator and the internal heat exchanger can be implemented in particular skillfully inside the stack of disks, so that the need for additional pipes or hoses is eliminated. This saves not only manufacturing costs but also logistical and assembly costs. It is also advantageous if the first stacking region is designed in such a way that the first fluid channel is designed for the flow of refrigerant and the second fluid channel is designed for the flow of coolant, wherein the second stacking region is designed in such a way that the third fluid channel is designed for the flow of refrigerant in the first state and the fourth fluid channel is designed for the flow of refrigerant in the second state. Correspondingly, the hydraulic diameter and/or the possible structure of the disc and/or the arrangement of turbulence inserts in the fluid channels may be designed or implemented to be adapted to the fluid