JP-7854797-B2 - Vehicle air conditioning system

Inventors

• 金子 智
• 中村 優一郎

Assignees

• サンデン株式会社

Dates

Publication Date

20260507

Application Date

20211216

Claims (5)

1. A vehicle air conditioning system comprising an air conditioning case equipped with multiple heat exchangers, a heat transfer medium circuit that circulates heated or cooled heat transfer medium through the heat exchangers, and heating or cooling the air that is blown into the air conditioning case and passes through the heat exchangers, The heat transfer medium circuit flows the heat transfer medium in series or in parallel between a first heat exchanger located on the upwind side and a second heat exchanger located on the downwind side within the air conditioning case. The air conditioning case includes a main airflow channel through which air flows continuously between the first heat exchanger and the second heat exchanger, and a bypass airflow channel through which air that has passed through the first heat exchanger flows, bypassing the second heat exchanger. The bypass airflow channel is provided with an airflow control damper to adjust the amount of air blown through the bypass airflow channel . The airflow adjustment damper is characterized by flowing air through the bypass airflow channel when a low-temperature heat transfer medium is flowed through the first heat exchanger and the second heat exchanger during maximum cooling, or when a high-temperature heat transfer medium is flowed through the first heat exchanger and the second heat exchanger during maximum heating .
2. The vehicle air conditioning system according to claim 1, characterized in that the first heat exchanger and the second heat exchanger have equal core thicknesses along the direction of airflow.
3. The vehicle air conditioning system according to claim 1 or 2 , characterized in that the core thickness of the first heat exchanger and the second heat exchanger along the airflow direction is 30 mm or less.
4. The vehicle air conditioning system according to any one of claims 1 to 3 , characterized in that the fin pitch of the heat exchange fins of the first heat exchanger and the second heat exchanger are equal.
5. The vehicle air conditioning system according to any one of claims 1 to 4 , characterized in that the first heat exchanger and the second heat exchanger have a fin pitch of 2.4 to 3 mm, which is the distance between the peaks of the heat exchange fins.

Description

This invention relates to an air conditioning system for vehicles. Vehicle air conditioning systems are equipped with a unit called HVAC (Heating, Ventilation, and Air Conditioning), which integrates a blower unit and an air conditioning case. Inside the air conditioning case of this vehicle air conditioning system are heat exchangers (coolers and heaters) that cool or heat the air introduced into the vehicle's interior or exterior by the blower. Conventional vehicle air conditioning systems have an evaporator (cooler) positioned on the upwind side and a heater core (heater) positioned on the downwind side inside the air conditioning case. Between the evaporator and the heater core, there is an air mix damper that switches between either allowing air that has passed through the evaporator to bypass the heater core, or mixing the air that has passed through the evaporator with the air passing through the heater core in a predetermined ratio (see, for example, Patent Document 1 below). Japanese Patent Publication No. 2016-88290 An explanatory diagram of a vehicle air conditioning system according to an embodiment of the present invention (at maximum cooling).An explanatory diagram of a vehicle air conditioning system according to an embodiment of the present invention (at maximum heating).This diagram illustrates the airflow conditions inside the air conditioning case ((a) is the low-temperature mode during maximum cooling (high-temperature mode during maximum heating), and (b) is the increased airflow mode during maximum cooling (increased airflow mode during maximum heating)).Diagram illustrating the control device that controls the airflow adjustment damper.An explanatory diagram showing the core thickness and fin pitch of the first and second heat exchangers inside the air conditioning case. The embodiments of the present invention will be described below with reference to the drawings. In the following description, the same reference numerals in different figures indicate parts with the same function, and redundant explanations in each figure will be omitted as appropriate. In Figure 1 or Figure 2, the vehicle air conditioning system 1 comprises an air conditioning case 10. The air conditioning case 10 includes multiple heat exchangers; in the illustrated example, a first heat exchanger 11 is located on the windward side, and a second heat exchanger 12 is located on the leeward side. The air conditioning case 10 has an airflow channel through which air from inside or outside the vehicle, supplied by a fan (not shown), flows. The first heat exchanger 11 and the second heat exchanger 12 are positioned to intersect this airflow channel. The airflow channels formed in the air conditioning case 10 include a main airflow channel 10A through which air supplied from a fan (not shown) flows continuously to the first heat exchanger 11 on the windward side and the second heat exchanger 12 on the leeward side, and a bypass airflow channel 10B through which air that has passed the first heat exchanger 11 bypasses the second heat exchanger 12. In the illustrated example, the main airflow channel 10A and the bypass airflow channel 10B are separated by a partition 14. The bypass airflow channel 10B is equipped with an airflow control damper 13 that adjusts the amount of air flowing through the bypass airflow channel 10B. By fully closing the airflow control damper 13 and blocking the bypass airflow channel 10B, all the air that has passed through the first heat exchanger 11 passes through the second heat exchanger 12. By opening the airflow control damper 13 and allowing air to flow through the bypass airflow channel 10B, a portion of the air that has passed through the first heat exchanger 11 passes through the second heat exchanger 12, while the remaining air flows through the bypass airflow channel 10B. The air flowing through the main airflow channel 10A, or the combined air from the main airflow channel 10A and the bypass airflow channel 10B, is sent to appropriate outlets in the air conditioning case 10 (e.g., defroster outlets, vent outlets, foot outlets, etc.), which are not shown in the illustration. In Figure 1 or Figure 2, the vehicle air conditioning system 1 includes a heat transfer medium circuit 30. The heat transfer medium circuit 30 circulates a heat transfer medium (such as water or LLC), heated or cooled by the heat pump 20, which is the heat source of the thermal management system, through multiple heat exchangers (first heat exchanger 11 and second heat exchanger 12) within the air conditioning case 10. The heat pump 20 includes a compressor 21 for compressing the refrigerant, a condenser 22 for condensing the compressed refrigerant, a pressure reducing unit (expansion valve) 23 for reducing the pressure of the condensed refrigerant, and an evaporator 24 for evaporating the reduced pressure refrigerant. The heat transfer medium circulating in the heat transfer medium circuit 30 forms two independent