JPH0357713A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To uniformalize the temperature distribution of air sent through a ventilation blowoff port by connecting a cold air rectifying duct with a cold air bypass passage outlet for rectifying the cold air to join the air passed through an air mixing chamber. CONSTITUTION:Cold air leaving an evaporator 12 is divided into warm air passing through a heater core 13 and the cold air detouring the core 13 according to the opening of an air mixing damper 15, and then mixed with each other in an air mixing chamber 16a. In this case, the cold air passing through a cold air bypass passage 17 is regulated to a fixed quantity according to the opening of a bypass damper 18, and led into a cold air rectifying duct 22, and then dispersively sent from a cold air blowoff port 23 of the duct 22 into the air mixing chamber 16a. Thus the cold air can be uniformly dispersed in the warm air for their mixing without deviation. The temperature distribution of the air sent through a ventilation blowoff port can thereby be uniformalized.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a vehicle air conditioner. ``Prior Art'' Vehicle air conditioners open and close an air mix damper to split cold air that has passed through an evaporator into warm air that has passed through a heater core and cold air that bypasses the heater core.
The mixing ratio of hot air and cold air in the air mix chamber is then adjusted by the opening degree of the air mix damper, controlling the airflow to provide each user with a conditioned airflow at the desired temperature. Furthermore, a cold air bypass passage is formed that bypasses the main passage of cold air in which such an air mix damper is arranged, and the user opens and closes the cold air bypass passage to directly mix the cold air with the warm air mixed in the main passage. A system has been developed that improves cooling performance by blowing into the conditioned airflow of the air conditioner. Such a vehicle air conditioner is a VENT system that steplessly opens and closes a bypass damper in a cold air bypass passage, adjusts the opening degree of an air mix damper, and blows out conditioned air from a FACE outlet (upper outlet). In the mode, the ventilation outlet temperature can be adjusted within the shaded range shown in Figure 7. In addition, conditioned air can be
In the B/L mode where air is discharged from both the ACE outlet and the FOOT outlet (lower outlet), the ventilator outlet temperature can be adjusted within the shaded range shown in Figure 8. However, in the vehicle air conditioner π, the cold air bypass passage a is connected to the vicinity of the ventilation outlet b, as shown in FIG. A conditioned air flow that mixes cold air and hot air in the chamber and heads toward the ventilation outlet b, and a cold air bypass passage a.
The cold air is not sufficiently mixed with the cold air that is being blown through the air, causing the cold air to be uneven. Therefore, each FA communicating with ventilation outlet b
The temperature distribution of the conditioned air blown out from the CE outlet is not uniform, causing variations. iP to eliminate this variation in temperature distribution! Adjustment is performed by adjusting fixed air guides, etc., with the cold air bypass passage either open or in the leap state. Therefore, when the cold air bypass passage is open, the temperature variation of the conditioned air blown out from each FACE Suita outlet is small, but when the cold air bypass passage is closed, the temperature variation is large. Alternatively, the situation may be the opposite, and there is a problem in that the originally intended improvement in comfort cannot be achieved sufficiently. The present invention is based on this l? This was done to solve the lff problem, and the ventilation is improved by uniformly mixing the cold air sent from the cold air bypass passage with the conditioned air flow that is a mixture of cold air and warm air in the air mix chamber. The purpose of this invention is to provide air conditioning equipment for a vehicle that can reduce variations in the temperature distribution of conditioned air blown out from an outlet. ``1000 steps to solve rHB'' A specific means for achieving the above purpose is to create a main flow passage through which cold air blown by a blower and passed through an evaporator flows, and a cold air bypass passage through which the cold air bypasses the main flow passage. A bypass damper is arranged in the cold air bypass passage to control the passing cold air flow, and a heater core and an air mix damper are arranged in the main passage, and the air mix damper bypasses the flow passing through the heater core and the heater core. an air mix chamber that mixes and harmonizes the warm air that has passed through the heater core and the cold air that has bypassed the heater core; a ventilation outlet that guides the air that bypasses the heater core and passes through the air mix chamber and the cold air that passes through the cold air bypass passage toward the center of the passenger compartment; In a vehicle air conditioner comprising a defroster outlet that guides air toward the front window, and a damper that switches between the respective outlets, the air conditioner is connected to an outlet end of the cold air bypass passage,
It is characterized by comprising a cold air rectifying duct having a plurality of cold air outlets, rectifying the cold air passing through the cold air bypass passage, and causing the cool air to pass through the air mix chamber and merge into the conditioned air. ．． "Operation" According to the specific means, the cold air that has passed through the evaporator is divided into warm air that passes through the heater core and cold air that bypasses the heater core, depending on the opening degree of the air mix damper disposed in the main flow passage. A conditioned air flow is generated by mixing in the air conditioning chamber, and by adjusting the opening degree of the bypass damper in the cold air bypass passage, a predetermined amount of cold air is blown out from the cold air outlet of the cold air rectification duct and mixed with the conditioned air. Join together. Since a plurality of cold air outlets are formed in the cold air rectifying duct, the cold air is uniformly mixed in the conditioned air flow without being biased, and variations in the temperature distribution of the conditioned air flow blown out from the ventilation outlets are prevented. can be resolved. ``Example'' An example of the present invention will be described based on the attached drawings. FIG. 1 is a sectional view showing a schematic configuration of a vehicle air conditioner 1. FIG. Vehicle air conditioning system W. An air inlet 3 is provided at one end of the duct 2 forming the outer shell of the duct 1, and a defroster outlet 4 is provided at the other end. A ventilation outlet 5 and a heat outlet 6 are provided. The defroster outlet 4 has a defroster damper 7. A vent damper 8 is provided at the ventilation outlet 5, and a heat damper 9 is provided at the heat outlet 6, respectively. The defroster outlet 4 is connected to each defroster outlet 4a in the vehicle interior.
The ventilation outlet 5 is connected to each FACE Suita outlet 5a in the vehicle interior, and the heat outlet 6 is connected to each FOOT in the vehicle interior.
Each communicates with the blowhole 6a. Inside duct 2,
The blower 11 is driven by the blower motor 10 in order from the air inlet 3111. A main flow passage 16 in which an evaporator 12, a heater core 13, and air mix dampers 14, 15 are disposed, and a cold air bypass passage 17 through which cold air bypasses the main flow passage 16 are formed into an ellipse. Mainstream passage 1
An air mix chamber 16a is formed downstream of the heater core 13 of No. 6. Furthermore, a bypass damper 18 is arranged in the cold air bypass passage 17 to control the flow of cold air. The air inlet 3 includes an outside air inlet 19 and an inside air inlet 20.
The inside/outside air switching damper 21 is switched to introduce outside air or introduce inside air. In addition, the cold air bypass passage l
The outlet end of No. 7 is branched into two branch outlets 17a and 17b.
Shape. A cold air rectifying duct 22 in which a plurality of cold air outlets 23 are arranged in an arbitrary direction is connected to the branch outlets 17a and 17b as shown in FIG. Let me come. The operation of the vehicle air conditioner 1 having the above configuration will be explained below. When the blower motor 10 is driven, the blower 11 rotates,
Outside air or inside air is introduced from the air inlet 3 and blown to the evaporator 12. The airflow passing through the evaporator 12 is cooled and dehumidified and becomes a cold air flow that heads toward the main flow passage 16 and the cold air bypass passage 17. The cold air flow toward the main flow passage 16 is divided into a cold air flow that passes through the heater core 13 and a cold air flow that bypasses the heater core 13, depending on the opening ratio of the air mix dampers 14 and 15. The cold air flow that passed through the heater core 13 is heated and becomes a warm air flow,
The air flows into an air mix chamber 16a formed downstream of the heater core 13. Since the cold air flow that has bypassed the heater core 13 also flows into the air mix chamber 16a, the warm air flow and the cold air flow are mixed here to generate a conditioned air flow. ! The l# airflow flows through the duct 2 and heads toward the defroster outlet 4, ventilation outlet 5, and heat outlet 6, and the conditioned airflow is generated according to the opening degrees of the defroster outlet 7, vent damper 8, and heat damper 9. Air is blown out from each of the air outlets in a controlled manner. On the other hand, cold air bypass passage 1
7 indicates the opening degree of the bypass damper 18. The flow of cold air is controlled based on this and is blown out from the cold air outlet 23 of the cold air rectifying duct 22 connected to the branch outlets 17a and 17b. The cold air rectifying duct 22 is arranged so as to cross the conditioned air flow heading toward the ventilation outlet 5 at 2fII points, and since the plurality of cold air outlets 23 are arranged in arbitrary directions, the cold air rectifying duct 22 is arranged so as to cross the conditioned air flow toward the ventilation outlet 5, and the plurality of cold air outlets 23 are arranged in arbitrary directions. The cold air flow blown out is uniformly mixed without being concentrated (see Figure 4). Therefore, the temperature distribution in the conditioned air flow becomes uniform without any bulk, and each FA in the vehicle compartment communicating with the ventilation outlet 5
Blows out from the CE outlet 5a. Generally, when the bypass damper of the cold air bypass passage 17 is opened in the B/L mode, the cold air is mixed, the air volume from the ventilation outlet 5 increases, and the temperature is lowered, so that the so-called cold and hot feeling in the legs is avoided. This further improves comfort. Figures 5 and 6 show the results of comparing the temperature control performance of this embodiment and the conventional example in VENT mode and B/L mode.
It is shown in the figure. FIG. 5 shows the case in the VENT mode. In the conventional case, as shown in FIG. As shown in (b), there is almost no temperature variation in the conditioned air blown out from each FACE outlet 5a communicating with the ventilation outlet 5. In addition, Fig. 6 shows the case in B/L mode, and in the conventional case, as shown in Fig. 6 (a>), both the heat outlet and the ventilation outlet are heated toward the 1-10T side. Compared to the large variation in temperature, in the case of this embodiment, as shown in FIG. There is almost no variation, and each F
There is also almost no variation in the temperature of the air blowing out from the OOT outlet 6a. As described above, variations in the temperature distribution of the conditioned air at the ventilation outlet 5 when the cold air bypass passage 17 is opened are eliminated, so from each FACE outlet 5a when the cold air bypass passage 17 is closed. By adjusting the variation in the temperature distribution of the conditioned air to be blown out, conditioned air with a uniform temperature distribution can be blown out from each FACE outlet 5a regardless of whether the cold air bypass passage is open or closed. Although this embodiment has been described using two cold air rectifying ducts 22, it is also possible to arrange l cold air rectifying ducts to cross the center of the conditioned air flow generated in the air mix chamber 16a. You can also do this. Furthermore, the cold air rectifying duct 22 may be placed behind the vent damper 8 within the air mix chamber 16a. The cross-sectional shape of the cold air rectifying duct 22 and the shape of the cold air outlet 23 can be freely changed in design such as circular, triangular, quadrangular, etc. In particular, the formation position, number, and size of the cold air outlet 23 can be changed as appropriate. By doing so, the distribution of the amount of cold air blown can be changed freely. "Effects of the Invention" The present invention provides a method for controlling the conditioned airflow generated in the air mix chamber by adjusting the opening degree of the bypass damper of the cold-air bypass passage, so that a predetermined amount of cold air is delivered to the cold-air outlet of the cold-air rectifying duct. Since a plurality of cold air outlets are formed in the cold air rectifying duct, the cold air is uniformly mixed in the conditioned air stream without being concentrated in the conditioned air stream. This makes it possible to eliminate variations in the temperature distribution of air flow, and provides a comfortable feeling without causing discomfort to the riding equipment due to the difference in temperature of the conditioned air at each FACE outlet that communicates with the ventilation outlet. There are excellent effects that can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a vehicle air conditioner;
Fig. 2 is a schematic cross-sectional view taken along the line A-A in Fig. 1, Fig. 3 is a perspective view of the cold air rectifying duct, Fig. 4 is an explanatory diagram showing the mode of mixing of the conditioned air flow and the cold air flow, and Fig. 5. FIG. 6 is a graph comparing the temperature control performance of the conventional example and the present invention, and FIG. 5 shows the case of VENT mode, and FIG. 6 shows the case of B/L mode. 7 and 8 are graphs showing the temperature adjustable range in relation to the opening degree of the bypass damper and the air mix damper, and FIG. 7 shows the temperature adjustment range in the VENT mode.
Figure 8 shows the case of B/L mode. Figure 9 is an explanatory diagram showing the problems of the conventional device. 1. ．． ．． Vehicle air conditioner, 2. ,,Duct,3,. ．． Air inlet, 5
．． ．． 2 ventilation outlets, 6. ．． , heat outlet, 8. ．． ．． Bent damper 9,. ．． heat damper,
1 1. ．． ．． Blower, 12. ．． ．． Evaporator, 13. ．． ．． Heat Core, 14,15. ．． ．． Air mix damper, 16. ．． ．． Mainstream passageway, 16a. ．．
．． Air mix chamber, 17. ．． ．． Cold air bypass passage, 18. ．． ．． Bypass damper, 22. ．． ．． Cold air rectification duct, 23. ．． ．． Cold air outlet. 1 Figure 1 Figure 5 (a) (b) Figure 4 Figure 6 (a) (Cold air bypass passage half open) (b) (Cold air bypass passage half open) Air mix damper opening Air mix damper opening Figure 9

Claims (1)

[Scope of Claims] A main flow passage through which cold air blown by a blower and passed through an evaporator flows, and a cold air bypass passage through which cold air bypasses the main flow passage, and a cold air flow passing through the cold air bypass passage is controlled. A bypass damper is disposed, and a heater core and an air mix damper are disposed in the mainstream passage, and the air mix damper divides the flow into a flow passing through the heater core and a flow bypassing the heater core, and the warm air passing through the heater core and an air mix chamber that combines and harmonizes the cold air that has bypassed the heater core; a heater outlet that guides the air that has passed through the air mix chamber downward into the passenger compartment; A ventilation outlet that guides the passing air and the cold air that passes through the cold air bypass passage toward the center of the vehicle interior, a defroster outlet that guides the air that passes through the air mix damper toward the front window, and each outlet. A vehicular air conditioner comprising a damper for switching the cold air bypass passage, which is connected to the outlet end of the cold air bypass passage and has a plurality of cold air outlets, and rectifies the cold air passing through the cold air bypass passage; An air conditioner for a vehicle, comprising a cold air rectifying duct that passes through the air mix chamber and joins the conditioned air.