JP4323307B2 - Vehicle heat exchanger system - Google Patents

Description

  The present invention relates to a vehicle heat exchanger system including a radiator that cools engine coolant, a condenser that cools an air-conditioning refrigerant, and a sub-radiator that cools an electric motor and the like.

2. Description of the Related Art Conventionally, a vehicle heat exchanger system has a structure in which an engine radiator is disposed in front of a vehicle body, an air conditioning condenser is disposed in front of the radiator, and a sub radiator for an electric motor is disposed in front of the radiator (see Patent Document 1). ).
JP 2002-276364 A

  However, in the invention described in Patent Document 1, the above-mentioned radiator, condenser, and sub-radiator perform heat exchange by air cooling with vehicle speed wind or fan wind, and therefore must be disposed in front of the vehicle body in the vicinity of the front grille. However, there was a problem that a large mounting space was required.

  In recent years, a vehicle equipped with a radiator for an air-cooled intercooler has been developed in front of the sub-radiator. The current vehicle heat exchanger system not only cannot meet the cooling specification requirements, but also the heat exchanger has become larger. It is difficult to install on a vehicle.

  Further, in addition to the above-described problems, simply using a water-cooled condenser has a high refrigerant outlet temperature, the efficiency of the air conditioner is deteriorated, and the fuel consumption is greatly deteriorated so that it cannot be actually used.

  The present invention has been made paying attention to the above-mentioned problems, and its object is to lower the outlet temperature of the condenser refrigerant by cooling the condenser with the cooling water of the sub-radiator and the refrigerant at the outlet of the evaporator. An object of the present invention is to provide a vehicle heat exchanger system capable of preventing the deterioration of the efficiency of an air conditioner and at the same time improving the performance of the heat exchanger system, making it more compact, and reducing the cost.

  In order to solve the above-mentioned problems, in the invention according to claim 1, there is provided a radiator for cooling engine cooling water, a sub-radiator for cooling cooling water lower than the cooling water for the radiator, and a condenser for cooling refrigerant for air conditioning. The capacitor is composed of a first capacitor and a second capacitor, and the first capacitor, the second capacitor, the expansion valve, the evaporator, and the compressor are arranged in this order, and the cooling water of the sub-radiator is used for the first. The refrigerant of the condenser is cooled, and the refrigerant of the second condenser is cooled by the refrigerant between the evaporator and the compressor.

  According to a second aspect of the present invention, in the vehicle heat exchanger system according to the first aspect, the radiator and the sub-radiator are disposed in front of a vehicle body, and the condenser is disposed close to the engine. .

  According to a third aspect of the present invention, in the vehicle heat exchanger system according to the first or second aspect, the cooling water of the sub-radiator cools the inverter.

  According to a fourth aspect of the present invention, in the vehicle heat exchanger system according to any one of the first to third aspects, the cooling water of the sub-radiator cools the motor.

  According to a fifth aspect of the present invention, in the vehicle heat exchanger system according to any one of the first to fourth aspects, the cooling water of the sub-radiator cools the intercooler.

  According to a sixth aspect of the present invention, in the vehicle heat exchanger system according to any one of the first to fifth aspects, the sub-radiator cooling water cools the alternator.

  In the first aspect of the invention, the refrigerant of the first condenser can be cooled with the cooling water of the sub-radiator, and at the same time, the refrigerant of the second condenser can be cooled with the refrigerant between the evaporator and the compressor. This enables efficient heat exchange of the condenser, lowering the refrigerant outlet temperature of the condenser to prevent deterioration of the efficiency of the air conditioner and improving fuel efficiency, while reducing the burden on the condenser, evaporator and compressor, The overall size and cost of the vehicle heat exchanger system can be reduced.

  In the invention according to claim 2, since the radiator and the sub-radiator are disposed in front of the vehicle body and the capacitor is disposed close to the engine, a space is secured in the front portion of the vehicle body compared to the conventional invention, and The degree of freedom in design can be expanded, and for example, it is possible to improve performance by increasing the size of the sub-radiator.

  In addition, by disposing the condenser close to the engine, it is possible to shorten the expensive refrigerant piping connecting the condenser, the expansion valve, the evaporator and the compressor, thereby reducing the cost and reducing the heat loss. Heat exchange is possible.

  In the invention according to claim 3, since the cooling water of the sub radiator cools the inverter, the inverter which is a problem as a heat countermeasure for the electric motor can be efficiently cooled.

  In the invention according to claim 4, since the cooling water of the sub-radiator cools the motor, the motor which is a problem particularly as a heat countermeasure for the hybrid vehicle can be efficiently cooled.

  In the invention according to claim 5, since the cooling water of the sub-radiator cools the intercooler, the intercooler that is a problem as a heat countermeasure for the turbo vehicle including the supercharger can be efficiently cooled. .

  In the invention described in claim 6, since the cooling water of the sub-radiator cools the alternator, the alternator which is a problem as a heat countermeasure for general vehicles including hybrid vehicles and turbo vehicles is efficiently cooled. Can do.

  Hereinafter, the Example of the heat exchanger system for vehicles of this invention is described.

  In the embodiment of the present invention, a hybrid vehicle in which a drive assist motor is combined with an engine will be described as an example of a vehicle in which the vehicle heat exchanger system is adopted. However, the vehicle heat exchanger system of the present invention is described below. The applied vehicle is not limited to a hybrid vehicle, and can be applied to a general vehicle.

Embodiment 1 of the present invention will be described below.
FIG. 1 is an overall view of a vehicle heat exchanger system according to a first embodiment of the present invention, and FIG. 2 is a diagram illustrating an example of a capacitor according to the first embodiment.

  As shown in FIG. 1, the vehicle heat exchanger system according to the first embodiment includes an engine 1, a radiator 2, a sub-radiator 3, and a condenser 4 as main components.

  The radiator 2 and the sub-radiator 3 are disposed in front of the engine 1, in other words, in the vicinity of a front grill (not shown) in front of the vehicle body, while the condenser 4 is disposed in the vicinity of the engine 1. Yes.

  The radiator 2 is for cooling the cooling water of the engine 1 by air cooling with vehicle running wind or fan wind. The radiator 2 includes an inlet port 2a and an outlet port 2b, and is 105 ° C. discharged from the engine 1. The front and rear cooling water flows into the radiator 2 from the inlet port 2a and is cooled to around 90 ° C., and then the electric refrigeration cycle is recirculated from the outlet port 2b to the engine 1 by the electric pump P1.

  The sub-radiator 3 is for cooling the power circuit 7 such as the inverter 5 and the motor 6, and is provided with an inlet port 3 a and an outlet port 3 b, and is cooled to around 70 ° C. discharged from the power circuit 7. After water flows into the sub-radiator 3 from the inlet port 3a and is cooled to around 50 ° C., the refrigerant of the condenser 4 described later is cooled by the electric pump P2 from the outlet port 3b, and the power circuit 7 is cooled at around 65 ° C. Thus, an electric motor refrigeration cycle that recirculates to the sub-radiator 3 is configured.

  The condenser 4 is for cooling a refrigerant for air conditioning, and includes a first condenser 8 and a second condenser 9, and the first condenser 8, the second condenser 9, the expansion valve 10, the evaporator 11, The flow rate adjusting valve 12 and the compressor 13 are connected to form an air conditioning refrigeration cycle.

  The first condenser 8 and the second condenser 9 are communicated with each other by a communication path 14, and the refrigerant passing through the communication path 14 of the first condenser 8 is cooled by the cooling water of the sub radiator 3.

  The second condenser 9 is connected to the bypass passage 15 via the flow rate adjusting valve 12, and the refrigerant passing through the communication passage 14 of the second condenser 9 is cooled by the refrigerant in the bypass passage 15. .

  That is, the condenser 4 according to the first embodiment is configured such that the refrigerant circulating in the air-conditioning refrigeration cycle is not air-cooled by the vehicle speed wind or fan wind as in the conventional invention, but is cooled by the cooling water of the sub-ragitator 3 and the outlet of the evaporator 11. Since it cools by the air cooling by the side refrigerant | coolant, a heat exchange rate is very high, and size reduction of the capacitor | condenser 4 itself can be achieved.

  As shown in FIG. 2, the capacitor 4 according to the first embodiment has a structure in which the first capacitor 8 and the second capacitor 9 each have two common oil cooler structures for a transmission.

Specifically, while the refrigerant flowing in from the inlet port 8a of the first condenser circulates in the shell body 8b through the communication path 14, the refrigerant flows into the shell body 8b from the cooling water inlet port 8c. Cooling is performed by exchanging heat with the cooling water of the sub radiator 3 filled around the passage 14.
The cooling water of the sub-radiator 3 that has exchanged heat with the first condenser 8 flows into the power circuit 7 from the cooling water outlet port 8d.

The communication path 14 is connected to the second condenser 9, and the refrigerant flowing into the second condenser 9 flows into the shell body 9a from the refrigerant inlet port 9b while circulating inside the shell body 9a. Then, the refrigerant is cooled by exchanging heat with the refrigerant in the bypass passage 15 filled around the communication passage 14, and then discharged from the outlet port 9e.
The refrigerant in the bypass passage 15 that has exchanged heat with the second condenser flows into the compressor 13 from the refrigerant outlet port 9c.

  In the condenser 4 configured in this way, the refrigerant gas around 90 ° C. compressed by the compressor 13 flows into the first condenser 8 from the inlet port 8a and is cooled by the cooling water of the sub-radiator 3 around 50 ° C., Next, after being cooled by the refrigerant gas in the bypass passage 15 at around 5 ° C. in the second condenser 9, it becomes around 50 ° C. and is discharged from the outlet port 9e to condense.

  Therefore, the capacitor 4 of the first embodiment can be formed with a simple and small configuration, and can be mounted close to the engine in a small space.

  Note that the structure of the capacitor 4 of this embodiment is an example, and other structures can be adopted, and the shell portion body 8b of the first capacitor 8 and the shell portion body 9a of the second capacitor 9 are integrally formed. It may be structured.

  The expansion valve 10 feeds the evaporator 11 while adjusting the flow rate of the liquid refrigerant discharged from the outlet port 9e.

  The evaporator 11 is for heat exchange by evaporating the liquid refrigerant. A part of the evaporated refrigerant gas is adjusted at a flow rate of about 7 ° C. via the bypass pipe 15 while the flow rate is adjusted by the flow rate adjusting valve 12. Sent to.

  Although supplementary, the flow rate adjustment of the flow rate adjustment valve 12 is appropriately determined according to the temperature of the refrigerant in the condenser 4 and the cooling water in the sub-radiator 3.

  Therefore, in the vehicle heat exchanger system of the first embodiment, the refrigerant in the first condenser 8 can be cooled using the cooling water of the sub-radiator 3 and at the same time, the refrigerant between the evaporator 11 and the compressor 13. Thus, the refrigerant of the second condenser 9 can be cooled, thereby lowering the outlet temperature of the refrigerant of the condenser 4 to prevent the deterioration of the efficiency of the air conditioner and improving the fuel efficiency. At the same time, the condenser 4, the evaporator 11, and the compressor 13 The required performance can be lowered, and the overall size and cost of the vehicle heat exchanger system can be reduced.

  Further, since the radiator 2 and the sub radiator 3 are disposed in front of the vehicle body, and the condenser 4 is disposed in the vicinity of the engine 1, the degree of freedom in designing the front portion of the vehicle body is broader than that of the conventional invention. The cooling performance of the power circuit 7 can be improved by increasing the size.

  In addition, by disposing the condenser 4 close to the engine, the expensive refrigerant piping connecting the condenser 4, the expansion valve 10, the evaporator 11, and the compressor 13 can be shortened, and the cost can be reduced and heat loss can be reduced. This makes it possible to efficiently exchange heat.

Embodiment 2 of the present invention will be described below.
FIG. 3 is an overall view of a vehicle heat exchanger system according to a second embodiment of the present invention.
In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted, and only differences will be described.

  The vehicle heat exchanger system according to the second embodiment is the same as the sub-radiator in the electric motor refrigeration cycle described in the first embodiment, after the cooling water is supplied from the electric pump P2 to the power circuit 7 and then again through the first condenser 8. 3 is different from the first embodiment in that it is refluxed to the inlet port 3a.

  That is, most of the inverters 5 or motors 6 in the current hybrid vehicle temporarily assist the drive of the engine 1 and are not always in full operation. The coolant (90 ° C.) of the first condenser 9 can be sufficiently cooled with cooling water around 70 ° C. to cope with it.

Although the embodiments of the present invention have been described above, the specific configuration of the present invention is not limited to the embodiments, and the present invention includes any design changes that do not depart from the gist of the invention. It is.
For example, in this embodiment, the sub-radiator 3 cools the power circuit 7 and configures the motor refrigeration cycle. However, the sub-radiator 3 cools cooling water having a temperature lower than that of the cooling water of the radiator 2. If there are, the cooling water can be cooled in various ways other than the power circuit 7. For example, as shown in FIG. 4, a water cooling intercooler 20, a water cooling alternator 21, a converter circuit 22, etc. are interposed in an electric motor refrigeration cycle. May be cooled.

1 is an overall view of a vehicle heat exchanger system according to a first embodiment of the present invention. 6 is a diagram illustrating a capacitor according to Example 1. FIG. It is a general view of the heat exchanger system for vehicles of Example 2 of the present invention. It is a general view of the heat exchanger system for vehicles of other Examples.

Explanation of symbols

P1, P2 Electric pump 1 Engine 2 Radiators 2a, 3a, 8a Inlet ports 2b, 3b, 9e Outlet port 3 Sub-radiator 4 Capacitor 5 Inverter 6 Motor 7 Power circuit 8 First capacitor 8b, 9a Shell body 8c Cooling water inlet port 8d Cooling water outlet port 9 Second condenser 9b Refrigerant inlet port 9c Refrigerant outlet port 10 Expansion valve 11 Evaporator 12 Flow rate adjusting valve 13 Compressor 14 Communication path 15 Bypass path

Claims (6)

A radiator for cooling the engine coolant,
A sub-radiator that cools cooling water lower than the cooling water of the radiator;
It has a condenser that cools the refrigerant for air conditioning,
The capacitor is composed of a first capacitor and a second capacitor, and the first capacitor, the second capacitor, an expansion valve, an evaporator, and a compressor are connected in this order.
Cooling the refrigerant of the first condenser with the cooling water of the sub-radiator;
The vehicle heat exchanger system, wherein the refrigerant in the second condenser is cooled by the refrigerant between the evaporator and the compressor. The vehicle heat exchanger system according to claim 1,
The radiator and the sub-radiator are disposed in front of the vehicle body,
A vehicle heat exchanger system, wherein the condenser is disposed close to an engine. The vehicle heat exchanger system according to claim 1 or 2,
A vehicular heat exchanger system, wherein the cooling water of the sub-radiator cools the inverter. In the vehicle heat exchanger system according to any one of claims 1 to 3,
A vehicular heat exchanger system, wherein the sub-radiator cooling water cools the motor. In the vehicle heat exchanger system according to any one of claims 1 to 4,
The vehicle heat exchanger system, wherein the cooling water of the sub-radiator cools the intercooler. In the vehicle heat exchanger system according to any one of claims 1 to 5,
The vehicle heat exchanger system, wherein the sub-radiator cooling water cools the alternator.

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