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Heat pump cycle

A heat pump cycle, heat technology, used in heat pumps, lighting and heating equipment, heating/cooling equipment, etc., to solve problems such as reduced vehicle fuel efficiency, heat transfer loss, and the inability of the engine to effectively defrost the evaporator

Active Publication Date: 2013-02-13
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, as in Patent Document 1, the structure for transferring the heat absorbed by the coolant from the engine to the evaporator through the air may dissipate the heat of the air (hot air) heated by the radiator into the surrounding air, thereby cause heat transfer loss
In some cases, waste heat from the engine as an external heat source cannot be effectively used to defrost the evaporator
[0010] As described above, waste heat from the engine cannot be effectively used to defrost the evaporator, making it take a long time to perform the defrost
Additionally, the engine must continue to run during defrost operations, making the vehicle less fuel efficient

Method used

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Examples

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no. 1 example

[0088] refer to Figure 1-5 , the first embodiment of the present invention will be described below. In this embodiment of the invention, the heat pump cycle 10 is applied to the air conditioner 1 of a vehicle called a hybrid vehicle that can obtain power from an internal combustion engine (engine) and an electric motor MG for travel. driving force. figure 1 An overall configuration diagram of the vehicle air conditioner 1 of the present embodiment is shown.

[0089] A hybrid vehicle can travel in a traveling state in which the vehicle obtains driving force from both the engine and the electric motor MG for traveling by running or stopping the engine according to the traveling load on the vehicle, etc. The electric motor MG obtains the driving force to switch between another traveling state of traveling. Therefore, a hybrid vehicle can improve fuel efficiency compared to a general car that only obtains driving force for traveling from an engine.

[0090] The heat pump cycl...

no. 2 example

[0214] Different from the first embodiment, in this embodiment, if Figure 6 As shown in the schematic diagram of the overall structure of , the indoor condenser 12 is removed, and the brine circuit 60 is provided for circulating brine, ie, as an example of a heating fluid. Figure 6 is a schematic diagram showing the overall structure of the refrigerant flow path etc. during the heating operation in this embodiment, where the flow of the refrigerant in the heat pump cycle 10 is indicated by a solid line, and the flow of the coolant in the coolant circulation circuit 40 is indicated by a broken line arrow express.

[0215] exist Figure 6 In , the same or equivalent parts as those of the first embodiment are denoted by the same reference numerals. The same applies to the other drawings below.

[0216] The brine in this embodiment is a heating fluid for transferring heat contained in the refrigerant discharged from the compressor 11 to the air blown into the vehicle interior...

no. 3 example

[0223] Different from the heat pump cycle 10 of the first embodiment, such as Figure 7 As shown in the schematic diagram of the overall structure, in this embodiment, the outdoor unit bypass channel 64 is added to allow the refrigerant flowing from the fixed throttling device 13 for heating or the bypass channel 14 for the fixed throttling device to bypass the outdoor unit. heat exchanger 16. In addition, an opening / closing valve 15c is further added to open and close the outdoor unit bypass passage 64 .

[0224] Figure 7 is a schematic diagram showing the overall structure of the refrigerant flow path during the defrosting operation in this embodiment, in which the flow of the refrigerant in the heat pump cycle 10 is indicated by a solid line, and the flow of the coolant in the coolant circulation circuit 40 is indicated by a dashed arrow express.

[0225] The opening / closing valve 15c has the same basic structure as that of the opening / closing valve 15a provided in the ...

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Abstract

In a heat pump cycle, the same outer fins (50) are connected to refrigerant tubes (16a) of an outdoor heat exchanger (16) which functions as an evaporator which evaporates refrigerant, and to coolant tubes (43a) of a radiator (43) which dissipates the heat of the coolant from a running electric motor (MG) which is an external heat supply. The heat retained by the coolant flowing through the coolant tubes (43a) can transfer heat to the refrigerant tubes (16a) of the outdoor heat exchanger (16) via the outer fins (50). Thus, during defrosting operations, when the coolant is passed through the radiator (43) to defrost the outdoor heat exchanger (16), heat transfer loss is suppressed when heat retained by the coolant is transferred to the outdoor heat exchanger (16), enabling the effective use of heat supplied from the running electric motor (MG) to defrost the outdoor heat exchanger (16).

Description

[0001] This application is based on Japanese Patent Application No. 2010-132891 filed on June 10, 2010 and Japanese Patent Application No. 2011-123199 filed on June 1, 2011, the contents of which are hereby incorporated by reference in their entirety enter. technical field [0002] The present invention relates to a heat pump cycle for performing a defrosting operation to remove frost formed in a heat exchanger serving as an evaporator. More specifically, the present invention relates to a heat pump cycle suitable for a vehicle air conditioner in which it is difficult to obtain a heat source for heating from a driving source for traveling. Background technique [0003] Conventionally, Patent Document 1 discloses a vapor compression refrigeration cycle (heat pump cycle) that performs a defrosting operation to melt and remove frost formed in a heat exchanger serving as an evaporator for evaporating refrigerant. Frost. [0004] The heat pump cycle disclosed in Patent Document...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B47/02
CPCF25B2400/0411F25B47/02B60H2001/00949F25B47/025F25B5/00F25B30/02B60H1/00921B60H1/004B60H2001/00961
Inventor 加藤吉毅伊藤诚司
Owner DENSO CORP
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