WO2019058809A1

WO2019058809A1 - Heat exchange system

Info

Publication number: WO2019058809A1
Application number: PCT/JP2018/030089
Authority: WO
Inventors: 佐藤　剛
Original assignee: 株式会社デンソー
Priority date: 2017-09-19
Filing date: 2018-08-10
Publication date: 2019-03-28
Also published as: JP6819522B2; JP2019051899A

Abstract

A heat exchange system (10) is installed in a vehicle (VC) and is provided with: a heat exchanger (100) for exchanging heat between air and a heating medium; a fan (300) for blowing out air so as to pass through the heat exchanger; an opening/closing mechanism (400) for switching between a state where air flows into a closed-off section, which is a part of the heat exchanger, and a state where air does not flow into the closed-off section; and a control device (700) for controlling the operation of the fan and the opening/closing mechanism. The fan is able to perform both a forward rotation operation where air is blown out toward the rear side of the vehicle and a reverse rotation operation where air is blown out toward the front side of the vehicle. The control device causes the opening/closing mechanism to operate so as to enter the state where air does not flow into the closed-off section when the fan is performing the reverse rotation operation.

Description

Heat exchange system

Cross-reference to related applications

This application is based on Japanese Patent Application No. 2017-178922 filed on September 19, 2017, and claims the benefit of its priority, and the entire contents of the patent application are: Incorporated herein by reference.

The present disclosure relates to a heat exchange system mounted on a vehicle.

A heat exchange system is mounted in an engine room provided on the front side of the vehicle. The heat exchange system is for exchanging heat between air and a heat medium (for example, a refrigerant for air conditioning). The heat exchange system is configured, for example, as a modularized combination of a single or a plurality of heat exchangers and a fan or the like for sending out air.

The fan of the heat exchange system described in Patent Document 1 below has a first operation mode in which outside air is discharged from the outside air opening in front of the vehicle toward the rear engine side, and from the rear engine side to outside air opening in the front It is possible to carry out a second operation mode of delivering air.

In the second mode of operation, air that is hotter and dry than ambient air is supplied from the engine side to the heat exchanger. For this reason, it is possible to efficiently recover the heat from the air without freezing the heat exchanger.

JP, 2015-101333, A

The fans of the heat exchange system are generally designed such that the flow rate of the delivered air is optimal when rotating in a direction to deliver the air from the front side to the aft side of the vehicle. For this reason, when the fan rotates in such a direction as to send out air from the rear side to the front side as in the second operation mode described above, the flow rate of air passing through the heat exchanger becomes small. As a result, heat recovery from air in the heat exchanger is not efficiently performed, and the load on the compressor for circulating the heat medium may be increased.

The present disclosure is a heat exchange system that can prevent the flow rate of air passing through the heat exchanger from being reduced when the fan operates to deliver the air from the rear side to the front side of the vehicle. , Aims to provide.

A heat exchange system according to the present disclosure is a heat exchange system mounted on a vehicle, comprising: a heat exchanger that exchanges heat between air and a heat medium; and a fan that sends out the air to pass through the heat exchanger. A control unit for controlling the operation of the fan and the opening / closing mechanism, and switching the state in which the air flows into the closed portion which is a part of the heat exchanger and the state in which the air does not flow into the closed portion; And. The fan is capable of performing both of a forward rotation operation for delivering air toward the rear side of the vehicle and a reverse rotation operation for delivering air toward the front side of the vehicle. The control device operates the open / close mechanism so that air does not flow into the closed portion when the fan performs reverse rotation operation.

In the heat exchange system of such a configuration, when the fan performs the reverse rotation operation, the control device operates the open / close mechanism so that the air does not flow into the closed portion. In this state, the flow rate of the air passing through the closed portion of the heat exchanger is zero, but the flow rate of the air passing through the portion other than the closed portion is increased accordingly. For this reason, even if the flow rate of the air sent out from the fan is reduced, the air of the sufficient flow rate is supplied to the portion other than the closed portion of the heat exchanger.

For example, in the case where a part of the heat exchanger is configured as a so-called "subcooler", when the heat exchanger functions as a condenser, the refrigerant flows through the subcooler while the heat exchanger is an evaporator. The refrigerant does not flow through the subcool section when functioning as Therefore, if the subcooling portion is configured to be included in the above-described closed portion, the flow rate of air can be sufficiently secured without sacrificing the heat exchange performance.

According to the present disclosure, heat that can prevent the flow rate of air passing through the heat exchanger from being reduced when the fan operates to deliver air from the rear side to the front side of the vehicle A switching system is provided.

FIG. 1 is a view schematically showing the heat exchange system according to the present embodiment mounted on a vehicle. FIG. 2: is a figure which shows typically the state by which the heat exchange system which concerns on this embodiment is mounted in the vehicle. FIG. 3 is a flow chart showing the flow of processing performed by the control device of the heat exchange system.

Hereinafter, the present embodiment will be described with reference to the attached drawings. In order to facilitate understanding of the description, the same constituent elements in the drawings are denoted by the same reference numerals as much as possible, and redundant description will be omitted.

The configuration of the heat exchange system 10 according to the present embodiment will be described with reference to FIGS. The heat exchange system 10 is mounted at a position on the front side of the engine EG in an engine room provided on the front side portion (left side portion in FIG. 1) of the vehicle VC. In the present embodiment, the vehicle VC is configured as a hybrid vehicle that can travel by the respective driving forces of the engine EG and the rotary electric machine (not shown).

The heat exchange system 10 includes a heat exchanger 100, a radiator 200, a fan 300, an opening / closing mechanism 400, a shutter device 600, and a control device 700, which are all configured as one module. It has become The control device 700 may be disposed at a position apart from the module.

The heat exchanger 100 is a heat exchanger for performing heat exchange between the air flowing outside and the air conditioning refrigerant (heat medium) flowing inside. The heat exchanger 100 is part of an air conditioner (the whole is not shown) provided in the vehicle VC. The air conditioner is configured as a heat pump system. When cooling the passenger compartment is performed, the heat exchanger 100 functions as a condenser for condensing the refrigerant. When heating of the passenger compartment is performed, the heat exchanger 100 functions as an evaporator for evaporating the refrigerant. Thus, the heat exchange system 10 according to the present embodiment functions as an "outdoor unit" of the heat pump system.

The heat exchanger 100 has a configuration in which a plurality of tubes (not shown) through which the refrigerant passes are vertically stacked with fins (not shown) interposed therebetween. The direction in which the air passes between the tubes is along the front-rear direction of the vehicle VC. In addition, since a well-known thing can be employ | adopted as a structure of such a heat exchanger, it abbreviate | omits about the specific illustration and description.

The tubes in the lower part of the heat exchanger 100 are used as a subcooler to further cool the refrigerant that has become a liquid phase by heat exchange with air when the heat exchanger 100 functions as a condenser. . The corresponding part is also described as “sub-cool unit 120” below. Moreover, the part above the subcool part 120 among the heat exchangers 100 is also described below as the "heat exchange core part 110."

When the heat exchanger 100 functions as a condenser, the refrigerant flows through the tubes in both the heat exchange core portion 110 and the subcooling portion 120. In the heat exchange core portion 110, the refrigerant is cooled and condensed by heat exchange with air, and changes from the gas phase to the liquid phase. Thereby, heat is released from the refrigerant to the air. In the subcooling unit 120, the refrigerant that has become a liquid phase through the heat exchange core unit 110 is further cooled by heat exchange with air. Thereby, the subcooling of the refrigerant is performed.

When the heat exchanger 100 functions as an evaporator, the refrigerant flows through the tubes of the heat exchange core portion 110 while the refrigerant does not flow through the tubes of the subcooling portion 120. Such switching of the refrigerant flow path is realized by the operation of a valve (not shown). In the heat exchange core portion 110, the refrigerant is heated and evaporated by heat exchange with air, and changes from the liquid phase to the gas phase. Thereby, heat is recovered from the air to the refrigerant.

The radiator 200 is a heat exchanger for cooling the cooling water circulating through the engine EG and the like by heat exchange with air. Radiator 200 is disposed at a position on the rear side of vehicle VC relative to heat exchanger 100. The radiator 200 has a first radiator 210 and a second radiator 220.

The first radiator 210 is a heat exchanger for cooling the cooling water supplied to the engine EG. The second radiator 220 is a heat exchanger for cooling cooling water supplied to accessories such as an inverter (not shown). The first radiator 210 and the second radiator 220 are arranged vertically as shown in FIG. 1.

The fan 300 is a blower that sends out air so as to pass through each of the heat exchanger 100 and the radiator 200. Fan 300 is provided at a position on the rear side of vehicle VC relative to radiator 200. The fan 300 can perform both of a forward rotation operation of delivering air toward the rear side engine EG and a reverse rotation operation of delivering air toward the front side heat exchanger 100 etc. There is. Note that FIG. 1 shows a state in which the fan 300 is rotating in the forward direction, and FIG. 2 shows a state in which the fan 300 is rotating in the reverse direction. The operation of the fan 300 is controlled by a control device 700 described later.

The opening and closing mechanism 400 is a mechanism provided to temporarily suppress the inflow of air to a part of the heat exchanger 100 as needed. The opening / closing mechanism 400 is disposed at a position on the front side of the heat exchanger 100 and includes a plate portion 410 and a rotating shaft 420. The plate-like portion 410 is a rectangular plate-like member, the end of which is fixed to the rotation shaft 420. The rotation shaft 420 is a rod-like member extending in the left-right direction of the vehicle VC (in the depth direction of the drawing in FIG. 1). The height of the position where the rotating shaft 420 is disposed is approximately equal to the height of the lower end of the heat exchanger 100.

The rotating shaft 420 is rotated about its central axis by an actuator (not shown). Thereby, a state in which a portion of the heat exchanger 100 is covered by the plate portion 410 from the front side (FIG. 2) and a state in which the portion of the heat exchanger 100 is not covered by the plate portion 410 (FIG. It is possible to switch between 1) and.

The part of the heat exchanger 100 which is covered (closed) by the opening / closing mechanism 400 in the state of FIG. 2 is hereinafter also referred to as a “closed part”. In the present embodiment, the height of the upper end of the plate-like portion 410 in the state of FIG. 2 is equal to the height of the upper end of the subcool portion 120. For this reason, in the present embodiment, the entire subcool portion 120 is included in the above-described closed portion. Instead of such an aspect, only a part of the subcool part 120 may be included in the above-mentioned closed part.

As shown in FIG. 1, in the state where the plate-like portion 410 is parallel to the horizontal plane, air flows into the closed portion. On the other hand, as shown in FIG. 2, when the plate portion 410 is perpendicular to the horizontal plane, air is blocked by the plate portion 410 and does not flow into the closed portion. Thus, the open / close mechanism 400 is a mechanism for switching between the state in which air flows into the closed portion which is a part of the heat exchanger 100 and the state in which air does not flow into the closed portion. The operation of the opening and closing mechanism 400 is controlled by the controller 700.

Shutter device 600 is a path through which air flows from the outside of vehicle VC toward heat exchanger 100, specifically, a path through which air passing through opening OP formed in the front grill reaches heat exchanger 100, It is an apparatus which switches opening and closing of. The shutter device 600 in the present embodiment is provided at a position on the front side of the heat exchanger 100.

The shutter device 600 has a plurality of blades 610 which are plate-like members, and these are aligned along the vertical direction. Each blade 610 can be rotated about a rotation axis along the left-right direction (in FIG. 1, the depth direction in the drawing) by a driving force from an actuator (not shown). As a result, it is possible to switch between the state in which the shutter device 600 is opened as shown in FIG. 1 and the state in which the shutter device 600 is closed as shown in FIG. The operation of the shutter device 600 is controlled by the controller 700.

When the shutter device 600 is open (FIG. 1), the blades 610 are separated from each other, and a gap is formed between the blades 610. At this time, air from the opening OP passes through the gap between the blades 610 and reaches the heat exchanger 100.

When the shutter device 600 is closed (FIG. 2), the blades 610 are in contact with each other, and no gap is formed between the blades 610. At this time, the air from the opening OP is blocked by the blades 610 and therefore does not reach the heat exchanger 100.

Control device 700 is a device for controlling the overall operation of heat exchange system 10. The control device 700 is configured as a computer system having a CPU, a ROM, a RAM, and the like. As described above, the control device 700 controls the operations of the fan 300, the opening / closing mechanism 400, and the shutter device 600.

Control device 700 controls the operation of each part of heat exchange system 10 based on a control signal transmitted from an air conditioning ECU (not shown) that controls the air conditioning device. Instead of such an aspect, the control device 700 may be configured as a part of the air conditioning ECU.

Other configurations will be described. An under duct 500 is provided at a position below the heat exchanger 100 in the interior of the vehicle VC. The underduct 500 is provided as a flow path connecting the space in which the heat exchanger 100 is disposed and the space on the rear side of the engine EG. An opening 510 is formed at the front end of the underduct 500, and an opening 520 is formed at the rear end. The underduct 500 is a part of the heat exchange system 10.

As shown in FIG. 1, in the state where the plate-like portion 410 is parallel to the horizontal plane, the opening 510 side of the underduct 500 is blocked by the partition wall WL1 and the plate-like portion 410 rising from the bottom of the engine room. It will be On the other hand, when the plate portion 410 is perpendicular to the horizontal surface as shown in FIG. 2, the air of the heat exchanger 100 can flow into the underduct 500 through the opening 510.

The operation of the heat exchange system 10 will be described. When cooling the passenger compartment is performed, the heat exchanger 100 functions as a condenser as described above. FIG. 1 shows a state in which the heat exchanger 100 functions as a condenser. In this state, the shutter device 600 is in the open state, and the fan 300 performs the forward rotation operation. For this reason, the air which flowed in from opening OP is supplied to heat exchanger 100 and radiator 200 from the front side. Such an air flow is shown by a plurality of arrows in FIG.

The fan 300 is designed so that the flow rate of the delivered air is optimal when rotating in a direction to deliver the air from the front side to the rear side of the vehicle, that is, when performing a forward rotation operation There is. Therefore, in the state shown in FIG. 1, a sufficient flow rate of air is supplied to each of the heat exchange core portion 110 and the subcooling portion 120.

Further, when air flows into the closed portion (the subcool portion 120 in the present embodiment) as shown in FIG. 1, the opening 510 of the underduct 500 is closed by the opening / closing mechanism 400. There is. For this reason, the air which has flowed in from the opening OP is all supplied to the heat exchanger 100 for heat exchange without flowing into the underduct 500.

When heating the passenger compartment, as described above, the heat exchanger 100 functions as an evaporator. FIG. 2 shows a state in which the heat exchanger 100 functions as an evaporator. In this state, the shutter device 600 is in the closed state, and the fan 300 performs the reverse rotation operation. For this reason, the air flowing toward the front is supplied to the heat exchanger 100 and the radiator 200 from the periphery of the rear engine EG.

Further, when the fan 300 performs the reverse rotation operation as shown in FIG. 2, the control device 700 operates the opening / closing mechanism 400 so that the plate-like portion 410 is perpendicular to the horizontal surface. Therefore, air does not flow into the closed portion of the heat exchanger 100.

In this state, the flow rate of the air passing through the closed portion in the heat exchanger 100 is 0, but the flow passes through the portion other than the closed portion (the heat exchange core portion 110 in this embodiment) Flow of air increases. Therefore, although the flow rate of the air delivered from the fan 300 is reduced by the reverse rotation operation, the heat exchange core portion 110 is supplied with air having a sufficient flow rate. As a result, sufficient heat exchange is performed in heat exchanger 100, and the operating load of a compressor (not shown) for circulating the refrigerant in the air conditioner is reduced, so that the fuel consumption performance of vehicle VC can be improved. .

As described above, when the heat exchanger 100 functions as an evaporator as shown in FIG. 2, the refrigerant does not flow in the tube of the subcooling unit 120. Therefore, although the subcooling portion 120 is closed by the opening / closing mechanism 400, this does not compromise the heat exchange performance of the heat exchanger 100.

The air that has passed through the heat exchange core portion 110 of the heat exchanger 100 flows downward along the shutter device 600 in the closed state. Thereafter, the gas flows from the opening 510 into the inside of the underduct 500 and is guided by the underduct 500 to a space on the rear side of the engine EG. After the air is heated by the engine EG, the air is again supplied to the heat exchanger 100 and subjected to heat exchange with the refrigerant. In FIG. 2, the flow of air as described above is indicated by a plurality of arrows.

As described above, the underduct 500 functions to guide the air that has passed through the heat exchanger 100 to the engine EG side when the fan 300 performs the reverse rotation operation.

The open / close mechanism 400 may be configured to cover the closed portion at a position forward of the heat exchanger 100 as described above, but the closed portion may be closed at a position rearward of the heat exchanger 100. It may be covered. However, in order to make the dimension in the front-rear direction of the heat exchange system 10 compact, the configuration in which the open / close mechanism 400 is disposed on the front side of the heat exchanger 100 as in this embodiment is preferable.

A flow of processing executed by the control device 700 will be described with reference to FIG. The series of processes shown in FIG. 3 are repeatedly executed by the control device 700 each time a predetermined control cycle elapses while the air conditioner is in operation.

In the first step S01, it is determined whether or not cooling of the vehicle compartment is being performed by the air conditioner. If cooling is being performed, the process proceeds to step S02. In step S02, processing for opening the shutter device 600 as shown in FIG. 1 is performed. In step S03 following step S02, a process of causing fan 300 to perform a forward rotation operation is performed. In step S04 following step S03, the opening / closing mechanism 400 performs a process of opening the closed portion as shown in FIG. The processes from step S02 to step S04 may be performed in an order different from that described above.

If it is determined in step S01 that cooling of the passenger compartment is not being performed, that is, if heating of the passenger compartment is being performed, the process proceeds to step S05. In step S05, the shutter device 600 is closed as shown in FIG. In step S06 following step S05, processing is performed to cause the fan 300 to perform the reverse rotation operation. In step S07 following step S06, the opening / closing mechanism 400 performs a process of closing the portion to be closed as shown in FIG. The processes from step S05 to step S07 may be performed in an order different from that described above.

The present embodiment has been described above with reference to the specific example. However, the present disclosure is not limited to these specific examples. Those appropriately modified in design by those skilled in the art are also included in the scope of the present disclosure as long as the features of the present disclosure are included. The elements included in the above-described specific examples, and the arrangement, conditions, and shapes thereof are not limited to those illustrated, but can be appropriately modified. The elements included in the above-described specific examples can be appropriately changed in combination as long as no technical contradiction arises.

Claims

A heat exchange system (10) mounted on a vehicle (VC),
A heat exchanger (100) for exchanging heat between air and a heat carrier;
A fan (300) for delivering air to pass through the heat exchanger;
An open / close mechanism (400) for switching between a state in which air flows into a closed portion which is a part of the heat exchanger, and a state in which air does not flow into the closed portion;
A controller (700) for controlling the operation of the fan and the opening / closing mechanism;
The fan can perform both of a forward rotation operation of delivering air toward the rear side of the vehicle and a reverse rotation operation of delivering air toward the front side of the vehicle.
The controller is
The heat exchange system operates the open / close mechanism such that air does not flow into the closed portion when the fan performs the reverse rotation operation.
In the heat exchanger,
A subcool section (120) is provided to further cool the refrigerant that has become a liquid phase by heat exchange with air,
The heat exchange system according to claim 1, wherein at least a part of the subcooling portion is included in the closed portion.
The opening and closing mechanism is
The heat exchange system according to claim 1 or 2, wherein air does not flow into the closed portion by covering the closed portion at a position closer to the front side of the vehicle than the heat exchanger.
At a position below the heat exchanger,
The under duct (500) for guiding the air having passed through the heat exchanger to the side of the engine (EG) when the fan is performing the reverse rotation operation is provided. The heat exchange system according to claim 1 or 2.
The heat exchange system according to claim 4, wherein when the air is in a state of flowing into the closed portion, the under duct is closed by the opening / closing mechanism.
The shutter apparatus (600) which switches opening and closing of the path | route which air reaches the said heat exchanger is provided in the position which becomes the front side of the said vehicle rather than the said heat exchanger. Heat exchange system according to claim 1.
The controller is
The heat exchange system according to claim 6, wherein when the fan performs the reverse rotation operation, the shutter device is operated such that air does not reach the heat exchanger.