Search

JP-7855576-B2 - Vehicle air conditioning system

JP7855576B2JP 7855576 B2JP7855576 B2JP 7855576B2JP-7855576-B2

Inventors

  • 長野 秀樹
  • 吉崎 久善

Assignees

  • 株式会社ヴァレオジャパン

Dates

Publication Date
20260508
Application Date
20220330
Priority Date
20210419

Claims (9)

  1. An air conditioning case 2 in which an air passage 3 is formed inside, A heating heat exchanger 7 is disposed within the air conditioning case 2 and heats the conditioned air introduced into the air passage 3, A hot air main passage 8 guides the conditioned air through the heating heat exchanger 7 and downstream as hot air, A cold air main passage 9 guides the conditioned air downstream as cold air, bypassing the heating heat exchanger 7 . An air mix door 10 adjusts the ratio of warm air flowing through the warm air main passage 8 to cold air flowing through the cold air main passage 9. An air mix chamber 11 mixes the cold air that has passed through the cold air main passage 9 with the warm air that has passed through the warm air main passage 8 to create harmonious air. A front air outlet 15 connected to the main cold air passage 9 of the front air mix chamber 11, The rear air outlet 16 is connected to the opposite side of the main cold air passage 9 of the air mix chamber 11, In a vehicle air conditioning system comprising: an air conditioning case 2 extending from the main cold air passage 9 and a cold air volume adjustment guide 20 that limits the amount of cold air flowing into the air mix chamber 11 when the air mix door 10 is near the full hot position, The system includes a cold air bypass guide 30 that takes in the cold air flowing through the main cold air passage 9 from the cold air inlet 31 and guides it to the rear outlet 16 while reducing mixing with the warm air flowing through the main warm air passage 8. The aforementioned cold air volume adjustment guide 20 has a notch 21 which is a part of the guide 20 that has been cut out. The vehicle air conditioning system is characterized in that the cold air inlet 31 faces the notch 21.
  2. The vehicle air conditioning system according to claim 1, characterized in that the cold air bypass guide 30 is provided on a baffle plate 33 provided in the air mix chamber 11.
  3. The vehicle air conditioning system according to claim 1, characterized in that the cold air bypass guide 30 is provided on both sides of the partition wall 40 that divides the air passage 3 into left and right sections.
  4. The vehicle air conditioning system according to claim 1, characterized in that the cold air bypass guide 30 is provided on the side walls 2a and 2b of the air conditioning case 2.
  5. The vehicle air conditioning system according to any one of claims 1 to 4, wherein the cold air bypass guide 30 guides cold air to the multiple rear air outlets 16.
  6. The vehicle air conditioning system according to any one of claims 1 to 5, characterized in that the cold air bypass guide 30 is formed in a cylindrical shape.
  7. The vehicle air conditioning system according to any one of claims 1 to 5, characterized in that the cold air bypass guide 30 is composed of guide plates 341, 342, 351, and 352 arranged substantially parallel to each other vertically.
  8. The vehicle air conditioning system according to any one of claims 1 to 7, wherein the front air outlet 15 is at least one of a defrost air outlet 151 and a side vent air outlet 152, and the rear air outlet 16 is at least one of a center vent air outlet 161 and a foot air outlet 162.
  9. The vehicle air conditioning system according to any one of claims 1 to 7, wherein the front air outlet 15 is a defrost air outlet 153, and the rear air outlet 16 is at least one of vent air outlets 164, 165 and foot air outlets 166, 167.

Description

The present invention relates to a vehicle air conditioning system that ensures the linearity of the conditioned air temperature when the air mix door is displaced from the full hot position, and also prevents the cool differential phenomenon. The vehicle air conditioning system comprises an air conditioning case with an air passage formed inside; a cooling heat exchanger located inside the air conditioning case for cooling the conditioned air introduced into the air passage; a heating heat exchanger for heating the conditioned air; a warm air main passage that guides the conditioned air downstream as warm air by passing it through the heating heat exchanger; a cold air main passage that guides the conditioned air downstream as cold air by bypassing the heating heat exchanger; an air mix door that adjusts the ratio of warm air flowing through the warm air main passage to cold air flowing through the cold air main passage; and an air mix chamber that mixes the cold air that has passed through the cold air main passage with the warm air that has passed through the warm air main passage to produce conditioned air. The air mix chamber is connected to a defrost vent for blowing conditioned air toward the windshield (not shown), a vent for blowing air toward the occupants' chests, and a foot vent for blowing air toward the occupants' feet. The air conditioning case is also provided with a mode door that adjusts the amount of conditioned air supplied to the defrost vent, vent vent, and foot vent to adjust the blowing mode. The air mix door is movable between a full-hot position, which eliminates the cold air flowing through the main cold air passage and allows all conditioned air to pass through the main warm air passage, and a full-cool position, which eliminates the warm air flowing through the main warm air passage and allows all conditioned air to pass through the main cold air passage. In particular, when the door is slightly opened, shifting from the full-hot position towards the full-cool position, the conditioned air that has passed through the cooling heat exchanger flows rapidly into the low-pressure gap (the gap between the air mix door and the seat portion that the air mix door seals when it is in the full-hot position), causing a phenomenon in which an amount of air exceeding the expected airflow volume for the small opening of the air mix door flows out from the main cold air passage into the air mix chamber. Therefore, the linearity of the conditioned air temperature in the air mix chamber (the proportional relationship between the amount of movement of the air mix door from the full-hot position and the rate of decrease in the conditioned air temperature in the air mix chamber) is impaired. In particular, at the defrost outlet connected to the main cold air passage in the air mix chamber, the cold air from the main cold air passage reaches the defrost outlet without being sufficiently mixed with the warm air in the air mix chamber. This can cause a "cool deflation" phenomenon where a large amount of cold air is discharged from the defrost outlet, potentially leading to problems such as fogging of the windshield. Therefore, in order to adjust the linearity of the conditioned air temperature by reducing the amount of cold air supplied from the main cold air passage to the air mix chamber when the door is at a small opening, it is desirable to provide a cold air flow rate adjustment guide that limits the amount of cold air flowing into the air mix chamber when the air mix door is near the full hot position. For example, in Patent Document 1 described below, an air mix door is provided as a cantilever door with a rotating shaft integrally provided at the end of a flat door body, and an arc-shaped guide plate is disclosed that is positioned at a predetermined distance from the tip of the air mix door along the rotational trajectory of the tip of the air mix door from the full hot position to a predetermined rotational angle range. This guide plate is thought to function as a cold air flow rate adjustment guide that limits the amount of cold air flowing into the air mix chamber when the air mix door is near the full hot position. Therefore, by providing such a cold air volume adjustment guide, the amount of cold air flowing into the air mix chamber when the air mix door is near the full-hot position can be suppressed, making it possible to adjust the linearity of the conditioned air temperature and avoid the cool-diff phenomenon. On the other hand, in order to obtain the desired temperature performance, there is a need to create a temperature difference in the conditioned air blown out from each outlet. Therefore, a configuration is required that guides the cold air flowing through the main cold air passage to the vent outlet, etc., without mixing it with the warm air as much as possible in the air mix chamber. Therefore, Patent Document 2 below proposes a configuration in which a cold air bypass guide (