JP2004243827A - On-vehicle air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materialize air distribution from a front direction of a face of a passenger A, and to downsize an air conditioner unit. <P>SOLUTION: An evaporator 17 and a heater core 18 are disposed by arranging in a vehicular right and left direction, and an air downstream side of the heater core 18 is made to branch off into two. A blowoff duct 16 having a defroster heat blowoff port 29 is coupled to a first branch, and disposed at the forefront portion of a vehicular ceiling portion. An air conditioner unit 14 is disposed behind the blowoff duct 16 in a vehicular interior so as to be adjacent to the blowoff duct 16. The second branch is formed with a face blowoff port 28 blowing off air from a front direction of the face of the passenger A to a vehicular interior inner side, and air passed through a cold air bypass passage 24 flows into an immediate upstream portion of the face blowoff port 28. On a branch portion, a blowoff mode switching door 26 for adjusting an air volume ratio between air flowing out to the blowoff duct 16 and air flowing out to the face blowoff port 28 is rotatably provided. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure of a vehicle-mounted air conditioner mounted on a cabin ceiling of a vehicle such as a construction machine, an industrial machine, an agricultural machine, etc., and particularly to a structure of a vehicle-mounted air conditioner capable of distributing air from the front of a face during cooling. .
[0002]
[Prior art]
As the vehicle-mounted air conditioner of this type, the present applicant has previously filed an application for a vehicle-mounted air conditioner described in Patent Document 1. This conventional device has a structure in which air is distributed from four places on the sides of the occupant during cooling.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 9-249020
[Problems to be solved by the invention]
In order to further enhance the feeling during cooling, it is effective to distribute air from the front of the face. However, in the above-described conventional device, since the cooling face duct is connected to the left and right sides of the air conditioner, the route of the duct becomes long in order to distribute the air from the front of the face, resulting in a wind flow that makes a U-turn with respect to the blower. Therefore, there is a problem that the pressure loss of the blowing system increases and the amount of blown air decreases.
[0005]
In addition, the height of the ceiling interior becomes closer to the face due to the addition of blow-out grills and ducts, which increases the feeling of oppression and reduces the comfort of the ceiling.In addition, it is necessary to route the face duct from the left and right, so control panels for radios and air conditioners, etc. There is also a problem that there is no more mounting place.
[0006]
The present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to realize air distribution from the front of the face with emphasis on a feeling at the time of cooling, and to deteriorate the livability. It is an object of the present invention to provide an in-vehicle air conditioner that can reduce the size of an air conditioning unit so as not to hinder the mounting of a radio / air conditioner panel or the like.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the technical means described in claims 1 to 5. That is, according to the first aspect of the present invention, the cooling heat exchanger (17) and the heating heat exchanger (18) are arranged side by side in the vehicle left-right direction, and the air downstream of the heating heat exchanger (18). One side is connected to an outlet duct (16) having a defroster heat outlet (29) for blowing air downward along the inner surface of the window glass (11) on the front of the vehicle. The air conditioning unit (14) is arranged at the forefront of the ceiling of the passenger compartment, adjacent to the outlet duct (16), and behind the outlet duct (16) in the passenger compartment. A face outlet (28) for blowing air from the front of the face of the occupant (A) toward the inside is formed, and the air that has passed through the cool air bypass passage (24) immediately upstream of the face outlet (28). And the branching section Characterized in that the air and the face air outlet to flow into the air duct (16) of the mode switching door for adjusting the flow proportions of air which flows out to the (28) (26) provided rotatably.
[0008]
Thereby, it is possible to realize the air distribution from the front direction of the face with an emphasis on the feeling at the time of cooling, and the cool air from the cooling heat exchanger (17) blows the face immediately after passing through the cool air bypass passage (24). Since the air is blown out from the outlet (28), the pressure loss in the air blowing system is small, and the amount of blown air can be increased.
[0009]
In addition, since the cooling heat exchanger (17) and the heating heat exchanger (18) are arranged side by side in the vehicle left and right direction, the front and rear dimensions of the air conditioning unit (14) can be suppressed, and the feeling of oppression can be eliminated. it can. In addition, the duct is only the blowout duct (16) which is routed forward from the air conditioning unit (14), and there is no duct on the left and right of the ceiling as in the conventional case, so that the air conditioning unit can be made compact. As a result, not only a sufficient space for mounting the radio (R) and the air conditioner panel (P) can be ensured, but also the livability can be improved.
[0010]
Further, the invention according to claim 2 is characterized in that the hot water inflow portion (18a) of the heating heat exchanger (18) is provided on the side of the outlet duct (16) in the branch. As a result, the temperature of the air flowing out to the side of the air outlet duct (16) having the air outlet for defroster heat (29) becomes relatively high, and the face air outlet (28) that blows air from the front of the face of the occupant (A). Since the temperature of the air flowing out to the side ()) is relatively low, when air is distributed from both outlets (28, 29) in an intermediate period such as spring or autumn, a suitable temperature gradient for head cold foot heat is obtained.
[0011]
According to the third aspect of the present invention, the bank (30) is provided below the cool air bypass passage (24), and the face ventilation from the rear of the heating heat exchanger (18) to the face outlet (28). An air guide means (32) is provided in the path (31).
[0012]
This is an improvement in the temperature distribution of the air distribution from the face outlet (28) during the development of the in-vehicle air conditioner of the present invention by the inventors. FIG. 5 shows the device of the present invention, and FIG. 6 shows the device of the present invention under development, both of which show the interim (bi-level) mode.
[0013]
As described above, when the temperature is adjusted by mixing the cool air that has passed through the cool air bypass passage (24) and the warm air heated by the heating heat exchanger (18), the one under development shown in FIG. In FIG. 6, the warm air flows along the wall and moves to the right of the face outlet (28), and the cool air is pushed by the warm air and moves to the left of the face outlet (28), resulting in one blow. There is a problem that a temperature gradient occurs on the left and right sides of the outlet (C-C plane).
[0014]
On the other hand, in the case of the present invention shown in FIG. 5, the air guide means (32) is provided in the face ventilation path (31) so that the warm air does not follow the wall and the left side of the face outlet (28). In addition to reaching the back, a bank (30) is provided below the cool air bypass passage (24) to draw cool air to the upper side of the face ventilation passage (31) and to the right back of the face outlet (28). As a result, the hot air and the cool air are mixed well at the upstream portion of the face outlet (28), so that the temperature becomes uniform and the air is blown out from the face outlet (28).
[0015]
Note that the reference numerals in parentheses of the respective units are examples showing the correspondence with specific units described in the embodiment described later, and the reference numerals not described in FIG. 6 also correspond to the embodiment described later. is there.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1A is a plan view showing an embodiment of the apparatus of the present invention, and FIG. The present invention relates to an in-vehicle air conditioner mounted on a vehicle such as a construction machine, an industrial machine, an agricultural machine, and the like, and the present embodiment shows an example applied to a cabin of a small special vehicle (for example, an agricultural tractor). is there. FIG. 2 is a schematic plan view of an embodiment of the device of the present invention.
[0017]
Reference numeral 10 denotes a vehicle ceiling outer panel, 11 denotes a vehicle front window glass, 12 denotes a vehicle rear window glass, 13 denotes a vehicle ceiling inner panel, 14 denotes an air conditioning unit, and 15 denotes a case of the unit 14. In this example, It is formed of resin, and can be connected to a blow duct 16 described later. Although not shown, the case 15 is divided into an upper case and a lower case, and devices such as an evaporator (cooling heat exchanger) 17 and a heater core (heating heat exchanger) 18 are provided therein. After being incorporated, the upper case and the lower case are integrally connected by an appropriate fastening means.
[0018]
The evaporator 17 is provided in a refrigeration cycle having a compressor driven by a vehicle engine (not shown), and cools the blown air by the latent heat of evaporation of the refrigerant. Further, the heater core 18 heats the blown air using cooling water (warm water) of the vehicle engine as a heat source. In the ceiling portion of the vehicle, the air outlet duct 16 is arranged at the forefront, and the air conditioning unit 14 is arranged adjacent to the rear side of the air outlet duct 16.
[0019]
And the blower 19 is arrange | positioned in the vehicle left-right direction side of the air conditioning unit 14, In this example, the left side. The blower 19 has a configuration in which a well-known centrifugal multi-blade fan is housed in a scroll casing, and an outlet of the scroll casing is connected to the air upstream side (left side of the vehicle) of the evaporator 17 in the air conditioning unit 14. Thus, the air blown by the fan flows into the air upstream side of the evaporator 17.
[0020]
In addition, a space between the ceiling outer panel 10 and the ceiling inner panel 13 of the vehicle is used to form an air intake passage 20 (see FIG. 1B) of the air conditioning unit 14, and a scroll (not shown) The air suction port of the casing is arranged on the upper surface side and communicates with the air suction channel 20. The air intake passage 20 is entirely formed inside the ceiling outer panel 10, and has an outside air introduction port 21 for introducing outside air and an inside air introduction for introducing inside air at a rearmost portion thereof. The mouth 22 is arranged.
[0021]
The inside and outside air introduction ports 21 and 22 are communicated with and blocked from the air suction passage 20 by the inside and outside air switching door 23. Further, a filter member (not shown) for removing dust and the like in the air is provided at both the inlets 21 and 22 for the inside and outside air. The hot water circuit that circulates hot water through the heater core 18 is provided with a flow control valve 24 that adjusts the flow of hot water to the heater core 18 (see FIG. 2). The hot water inflow portion 18a to the heater core 18 is provided on the side of the outlet duct 16 in a branch described later.
[0022]
Next, the structure of the air conditioning unit 14, which is a main part of the present invention, will be described including a control mechanism for controlling the temperature of the air blown into the vehicle interior and a blowout mode switching mechanism. First, the evaporator 17 and the heater core 18 are arranged side by side in the vehicle left-right direction. A cool air bypass passage 24 for bypassing the cool air cooled by the evaporator 17 is provided on the side of the heater core 18 (in the present embodiment, on the rear side of the vehicle). Further, a cool air bypass door 25 for adjusting the opening of the cool air bypass passage 24 is provided.
[0023]
The air downstream side of the heater core 8 is branched into two. An outlet duct 16 having a defroster / heat outlet 29 for blowing air downward along the inner surface of the window glass 11 on the front of the vehicle is connected to one side of the branch. The blow duct 16 is formed by blow molding of a resin material. A plurality (three in this example) of air outlets 29 are arranged side by side in the vehicle left-right direction, and the air blown out from the air outlets 29 goes downward along the inner surface of the window glass 11 on the front of the vehicle. Therefore, it serves both as a foot outlet for allowing warm air to reach the feet of the driver and as a defroster outlet for preventing fogging of the window glass 11.
[0024]
The outlet 29 is provided with a grill mechanism (see FIG. 1 (b)) that can shut off and adjust the blowing direction by manual operation. The outlet duct 16 is arranged at the forefront of the ceiling of the vehicle compartment, and the air conditioning unit 14 is arranged adjacent to the rear side of the compartment from the outlet duct 16.
[0025]
The other side of the branch is directed toward the vehicle interior through the U-turned face ventilation path 31, and the end is a face outlet 28 that blows air from the front of the occupant A's face. The face outlet 28 is also provided with a grill mechanism (see FIG. 1B) that can shut off the blown air and adjust the blowing direction by manual operation.
[0026]
Further, the air that has passed through the cold air bypass passage 24 flows into the upstream portion of the face outlet 28. A bank 30 is provided below the cool air bypass passage 24 (see A in FIG. 2), and an air guide 32 (32a to 32a in FIG. 32c). In this example, the bank 30 and the air guide 32 are integrally formed of resin on the bottom side of the case 15.
[0027]
Further, a blowing mode switching door 26 is rotatably provided at the branching portion so as to adjust the ratio of the amount of air flowing out to the blowout duct 16 for defroster heat and the amount of air flowing out to the face outlet 28. It has become. The flow rate control valve 24, the cool air bypass door 25, and the blow mode switching door 26 are connected to an air conditioner operation panel P (see FIG. 1A) provided on the ceiling interior. It is connected to a member (manual operation member) and operates in conjunction with manual operation of the temperature / mode adjustment member. Incidentally, R shown in FIG. 1A is a radio or the like similarly mounted on the ceiling interior.
[0028]
Next, the operation in the above configuration will be described. FIG. 3 shows the maximum cooling (face) mode. By operating the compressor and the blower 19 of the refrigeration cycle, the refrigerant circulates through the evaporator 17 and the blast air (inside air or outside air) of the blower 19 is blown to the evaporator 17. Then, the blown air is cooled by the evaporator 17 and becomes cool air. Here, as shown in FIG. 3, when the cool air bypass door 25 is operated to the fully open position of the cool air bypass passage 24, the flow regulating valve 24 is operated to the fully closed position.
[0029]
Further, the outlet mode switching door 26 is operated to a position where the face ventilation passage 31 is fully opened and the flow path to the outlet duct 16 is fully opened. Therefore, the cool air cooled by the evaporator 17 passes through the cool air bypass passage 24 and the heater core 18 and reaches the face outlet 28. Then, cool air is blown out from the face outlet 28 toward the face of the occupant A to cool the passenger compartment.
[0030]
In adjusting the temperature of the blown air in the cooling mode, a small amount of hot water is circulated to the heater core 18 when the flow rate control valve 24 is slightly opened, so that the air passing through the heater core 18 is heated to become hot air. Further, by adjusting the opening of the cool air bypass door 25, the amount of cool air passing through the cool air bypass passage 24 can be adjusted. By mixing the cool air and the warm air that has passed through the heater core 18 in the face ventilation passage 31, the temperature of the cool air blown out from the face outlet 28 into the vehicle compartment can be adjusted. In the maximum cooling mode, the circulation of the hot water to the heater core 18 is stopped by fully closing the flow control valve 24, thereby preventing heat radiation into the cool air.
[0031]
Next, FIG. 4 shows a maximum heating (diff heat) mode. The cool air bypass door 25 is operated to a position where the cool air bypass passage 24 is fully closed. As a result, the entire amount of the air blown by the blower 19 passes through the evaporator 17 and is heated by the heater core 18 to generate hot air, so that a maximum heating state is achieved. At this time, the outlet mode switching door 26 is operated to a position where the side of the face ventilation passage 31 is fully closed and the side of the outlet duct 16 is fully opened, so that all the warm air heated by the heater core 18 is discharged to the foot / defroster outlet. From 29 blows into the cabin.
[0032]
The window glass 11 is prevented from fogging from the foot / defroster outlet 29, and warm air is allowed to reach the feet of the occupant A to cool the passenger compartment. In the heating mode, the compressor of the refrigeration cycle is stopped to stop the circulation of the refrigerant to the evaporator 17 to prevent cooling into the blown air, and to adjust the opening of the flow control valve 24 to adjust the heater core. The amount of hot water circulated to 18 is adjusted, and the temperature of the blown air is adjusted.
[0033]
Next, FIG. 5 shows a state of a bilevel mode used in an intermediate period such as spring or autumn. In the bi-level mode, in contrast to the cooling / heating mode, the cool air bypass door 25 is operated to an intermediate opening position of the cool air bypass passage 24, and the blow mode switching door 26 is also connected to the blow duct 16 and the face ventilation. Operate to an intermediate position with the road 31 side.
[0034]
As a result, a part of the warm air heated through the heater core 18 flows toward the defroster / heat outlet 29, and a part of the heated warm air passed through the heater core 18 passes through the face ventilation passage 31. Then, the air is mixed with the cool air from the cool air bypass passage 24 and blown out from the face outlet 28. Therefore, the temperature of the air blown out from the face blowout port 28 can be made lower than the temperature of the air blown out from the defroster heat blowout port 29, and a comfortable temperature distribution of a head-and-foot type can be formed in the vehicle interior. Also in this mode, the opening degree of the flow control valve 24 is adjusted to adjust the amount of hot water circulated to the heater core 18 to adjust the temperature of the blown air.
[0035]
By the way, with the above-described structure alone, the warm air heated through the heater core 18 flows along the wall and moves to the right of the face outlet 28, and the cool air from the cool air bypass passage 24 is pushed by the warm air. As a result, the temperature is shifted to the left of the face outlet 28, and a temperature gradient occurs on the left and right of one outlet 28. Therefore, an air guide 32 is provided in the face ventilation passage 31. Specifically, the flow of the warm air is reduced by the air guides 32a and 32b, and the narrowed warm air is allowed to reach the inner left side of the face outlet 28 without being made to follow the wall by the air guide 32c.
[0036]
In addition, by providing the bank portion 30 (see A in FIG. 2) below the cool air bypass passage 24, the cool air from the cool air bypass passage 24 is blown out to the upper side in the face ventilation passage 31 to collide with the warm air. Is reduced to reach the right back of the face outlet 28. As a result, the hot air and the cool air are mixed well at the upstream portion of the face outlet 28 to have a uniform temperature and are blown out from the face outlet 28.
[0037]
Next, features of the present embodiment will be described. The evaporator 17 and the heater core 18 are arranged side by side in the vehicle left-right direction, and the downstream side of the air of the heater core 18 is branched into two, and air is blown downward along one side of the window glass 11 on the front of the vehicle. An air duct 16 having a defroster / heat outlet 29 is connected and arranged at the forefront of the ceiling of the cabin, and an air conditioning unit 14 is arranged adjacent to the air duct 16 and on the rear side of the cabin from the air duct 16. On the other side of the branch, a face outlet 28 for blowing air from the front of the face of the occupant A toward the inside of the passenger compartment is formed, and the cold air bypass passage 24 is passed immediately upstream of the face outlet 28. A blow-off mode in which air flows in and further adjusts a flow rate of air flowing out to the blow-out duct 16 and air flowing out to the face blow-out port 28 at the branch portion. It is provided with a replacement for the door 26 to be rotatable.
[0038]
Thereby, it is possible to realize the air distribution from the front direction of the face with an emphasis on the feeling at the time of cooling, and to blow the cool air from the evaporator 17 from the face outlet 28 immediately after passing through the cool air bypass passage 24. Pressure loss is small, and the blowing air volume can be increased.
[0039]
Further, since the evaporator 17 and the heater core 18 are arranged side by side in the vehicle left-right direction, the front-rear dimension of the air conditioning unit 14 can be suppressed, and the feeling of oppression can be eliminated. In addition, the duct is only the blow-out duct 16 that is routed forward from the air conditioning unit 14, and there is no duct on the left and right of the ceiling as in the conventional case, so that the air conditioning unit can be made compact. As a result, not only a sufficient space for mounting the radio R, the air conditioner panel P, etc. can be secured, but also the livability can be improved.
[0040]
The hot water inflow portion 18a of the heater core 18 is provided on the side of the outlet duct 16 in the branch. As a result, the temperature of the air flowing out to the blow-out duct 16 having the defroster heat blow-out port 29 becomes relatively high, and the temperature of the air flowing out to the face blow-out port 28 which blows out air from the front of the occupant A's face is increased. Is relatively low, so that when air is distributed from both outlets 28 and 29 in the middle period such as spring or autumn, a suitable temperature gradient of head cold foot heat is obtained.
[0041]
A bank 30 is provided below the cool air bypass passage 24, and an air guide 32 is provided in a face ventilation passage 31 extending from the rear of the heater core 18 to the face outlet 28. With these arrangements, the warm air is allowed to reach the left back of the face outlet 28 without being along the wall, and the cool air is directed to the upper side of the face ventilation passage 31 to reach the right back of the face outlet 28. In the upstream part of the face outlet 28, the warm air and the cool air are mixed well so that the temperature becomes uniform and is blown out from the face outlet 28.
[0042]
(Other embodiments)
In the above-described embodiment, the blow-out duct 16 is formed as a separate body. However, the blow-out duct 16 may be formed integrally with the resin case 15 of the air conditioning unit 14. Further, the configuration inside the air conditioning unit 14 may have a symmetrical positional relationship with the above-described embodiment. In the above-described embodiment, the door uses a cantilevered fulcrum plate door, but the present invention is not limited to this, and another type of door may be used.
[Brief description of the drawings]
1A is a plan view showing an embodiment of the apparatus of the present invention, and FIG.
FIG. 2 is a schematic plan view of an embodiment of the apparatus of the present invention.
FIG. 3 is a schematic plan view showing a maximum cooling (face) mode of the apparatus of the present invention.
FIG. 4 is a schematic plan view showing the maximum heating (defroster heat) mode of the apparatus of the present invention.
FIG. 5 is a schematic plan view showing an intermediate (bi-level) mode of the apparatus of the present invention.
FIG. 6 is a schematic plan view showing an intermediate (bi-level) mode of the device of the present invention under development.
[Explanation of symbols]
11 Window glass 14 Air conditioning unit 16 Blow-off duct 17 Evaporator (Heat exchanger for cooling)
18 heater core (heat exchanger for heating)
18a Hot water inflow section 24 Cold air bypass passage 25 Cold air bypass door 26 Blow mode switching door 28 Face outlet 29 Defroster / heat outlet 30 Bank 31 Face ventilation path 32 Air guide (air guide means)
A crew

Claims (3)

The air conditioning unit (14) was installed on the ceiling in front of the passenger compartment, and passed through the cooling heat exchanger (17) for cooling the air to the air conditioning unit (14) and the cooling heat exchanger (17). A heating air heat exchanger (18) for heating air is provided, and a cool air bypass passage (17) is provided beside the heating air heat exchanger (18) to bypass the cold air cooled by the cooling heat exchanger (17). 24), wherein the opening degree of the cool air bypass passage (24) is adjusted by the cool air bypass door (25).
The cooling heat exchanger (17) and the heating heat exchanger (18) are arranged side by side in the vehicle left-right direction,
The air downstream side of the heating heat exchanger (18) is branched into two, and one side blows air downward along the inner surface of the window glass (11) on the front of the vehicle. 29) are connected to an outlet duct (16) having a forefront part of a ceiling part of a passenger compartment;
The air conditioning unit (14) is arranged adjacent to the blow duct (16) and behind the blow duct (16) in the rear of the passenger compartment.
The other side of the branch forms a face outlet (28) for blowing air from the front of the face of the occupant (A) toward the inside of the vehicle interior, and the cold air is provided immediately upstream of the face outlet (28). The air that has passed through the bypass passage (24) flows in,
Further, a blow mode switching door (26) is provided at the branch portion so as to be rotatable so as to adjust an air volume ratio of air flowing into the blow duct (16) and air flowing into the face blow port (28). In-vehicle air conditioner, characterized in that: The in-vehicle air conditioner according to claim 1, wherein a hot water inflow portion (18a) of the heating heat exchanger (18) is provided on the side of the outlet duct (16) in the branch. A bank (30) is provided below the cool air bypass passage (24), and an air guide means is provided in a face ventilation path (31) from the rear of the heating heat exchanger (18) to the face outlet (28). The in-vehicle air conditioner according to claim 1 or 2, wherein (32) is provided.

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