JP2006076490A - Vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular air-conditioner having a structure in which conditioned air is supplied to both feet, and capable of ensuring the temperature difference between face outlets 6a/7a and a foot outlet 25 in the bi-level mode, and eliminating the temperature distribution within the outlet in other modes. <P>SOLUTION: A mixing unit of hot air and cold air is constituted in an air-conditioning unit 3 with a flow passage of a lead-out stream of an evaporator 12 as a three-layered flow of a hot air passage 19 and main/sub cold air bypass passages 16/21, and the temperature distribution between outlets in each mode and within each outlet can be eliminated. By respectively adjusting a maximum hot door 20/an air-mix door 17/a cold air bypass door 22 provided on the respective passages 19/16/21, the temperature difference between the face outlets 6a/7a and the foot outlet 25 can be freely adjusted in the bi-level mode. By providing the foot outlet 25 on a forward side of a vehicle of the air-conditioning unit 3, conditioned air is supplied to both feet. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle air conditioner mounted on various work machine vehicles such as construction machine vehicles and agricultural machine vehicles.

  Conventionally, in vehicle air conditioners mounted on various work machine vehicles such as construction machinery vehicles and agricultural machinery vehicles, the space inside the cabin is small, so an air conditioning unit is arranged below the driver's seat, and this air conditioning A ventilation duct is arranged from the unit to each outlet in the cabin. Examples of this type of vehicle air conditioner include those shown in Patent Document 1 and Patent Document 2 below.

  For example, in Patent Document 1, as shown in FIG. 11, an air conditioning unit 3 in which an evaporator, a heater core, a blower, and the like (not shown) are installed is installed below a driver's seat 2 in a cabin 1 of a construction machine such as a hydraulic excavator. ing. A rear duct 4 and a front duct 5 that extend upward along the back surface of the cabin 1 are connected to the air conditioning unit 3.

  At the upper end of the rear duct 4, a pair of rear outlets 6 that are opened behind the driver's seat 2 are formed. The front duct 5 includes a first duct 7 connected to the side surface of the air conditioning unit 3 so as to extend forward along the right side surface of the cabin 1, a second duct 9 formed with a foot outlet 8, and a face. A third duct 12 (shown by a two-dot chain line in the figure) in which the blowout port 10 and the defroster blowout port 11 are formed is sequentially connected.

  Moreover, in patent document 2, as shown in FIG. 12, the vehicle air conditioner 1 is roughly divided into an air conditioning unit 5 that air-conditions air to be blown and a blower duct 7 through which air conditioned by the air conditioning unit 5 flows. Has been. The air conditioning unit 5 is disposed below the driver's seat 9 of the cabin 3 and adjusts the amount of air passing through the bypass passage portion and bypass passage portion that bypasses the blower, the evaporator, the heater core, and the heater core in a case (not shown). A guide door is provided on the downstream side of the door / heater core.

Further, as shown in FIG. 12, the air duct 7 is provided with a face duct 33 and a foot duct 35, and the air duct 7 sends air blown from the air conditioning unit 5 to the face duct 33 and the foot duct 35. To guide you. The face duct 33 blows out wind toward the upper body of the occupant in the cabin 3, and the foot duct 35 blows out wind toward the lower body of the occupant.
JP 2000-168342 A JP 2001-97021 A

  However, in each of the prior arts shown in the above patent documents, an opening for allowing the conditioned air to flow out is provided only on the side surface of the air conditioning unit in the left-right direction of the vehicle. For this reason, especially in the foot blower outlet which blows air-conditioning wind toward a driver | operator's step, in patent document 1, since it blows off from both sides with respect to both feet, there exists a problem that feeling is not good. Further, in Patent Document 2, the conditioned air supplied from the side is blown from the back of both feet using the foot duct 35, but this is a problem in reducing space and cost.

  Moreover, in patent document 2, in order to ensure the temperature difference of a face blower outlet and a foot blower outlet at the time of the bi-level blowout mode which aims at cold head heat, only the upper part has the cold air bypass passage in an air-conditioning unit, and a guide or partition in an air duct There are plates, etc., but the temperature is divided up and down in the air conditioning unit and the air duct when adjusting the temperature, and the mixing of hot air and cold air is not enough, so the temperature distribution in the outlet in other blowing modes There is a problem of being able to.

  The present invention has been made in view of the above-described problems of the prior art, and a first object is to provide a structure in which air-conditioned air can be applied to both feet while suppressing space and cost. The object is to provide a vehicle air conditioner that can secure a temperature difference between the face outlet and the foot outlet in the bi-level outlet mode and can eliminate temperature distribution in the outlet in other outlet modes. It is in.

  In order to achieve the above object, the present invention employs technical means described in claims 1 to 3. That is, according to the first aspect of the present invention, the air conditioner is configured to air-condition the cabin (1) of the vehicle for various work machines, and the air conditioning unit (3) is installed below the driver seat (2) in the cabin (1). The air conditioning unit (3) includes a cooling heat exchanger (12) for cooling the air in the air conditioning case (10) and a heating heat exchanger (for heating the air that has passed through the cooling heat exchanger (12) ( 13), the heat exchangers (12, 13) are arranged in the vehicle left-right direction so that the air blown from the blower means (11) flows in the vehicle left-right direction, and the heat exchanger (13) for heating Arranged at the upstream side of the main cold air bypass passage (16) that flows by bypassing the heating heat exchanger (13) on the vehicle rear side, and the heating heat exchanger (13) and the main cold air bypass passage (16). The air passing through the heating heat exchanger (13) and the main cold air An air volume ratio adjusting means (17) for adjusting an air volume ratio with the air passing through the passage (16), and bypassing the heating heat exchanger (13) on the vehicle front side of the heating heat exchanger (13). The sub-cold air bypass passage (21) flowing, the bypass air volume adjusting means (22) for adjusting the opening degree of the sub-cold air bypass passage (21), and the hot air passage (19) downstream of the heating heat exchanger (13) On the air-conditioning wind provided for the warm air variable door means (20) and the air-conditioning unit (3) in the lateral direction of the vehicle and blown out toward the driver's head, or on the front window glass of the cabin (1) A face / defroster opening (24) through which the conditioned air for blowing out flows out, and a foot outlet (25) provided on the vehicle front side of the air conditioning unit (3) for blowing the conditioned air toward the driver's feet. And face Furosuta opening is characterized by comprising an aperture ratio adjusting means (26) for adjusting the opening rate of the (24) and the foot outlet (25).

  According to the first aspect of the present invention, the flow path downstream of the cooling heat exchanger (12) is a three-layer flow of the hot air passage (19) and the main and auxiliary cold air bypass passages (16, 21). The mixing of hot air and cold air in the air conditioning unit (3) enables temperature adjustment in each blowing mode of the face, bi-level and foot, and between each outlet in each blowing mode. , And the temperature distribution in each outlet can be eliminated.

  Also, the hot air variable door means (20), the air volume ratio adjusting means (17), and the bypass air volume adjusting means (22) provided in the hot air passage (19) and the cold air passages (16, 21), respectively, are adjusted. Thus, it becomes possible to freely adjust the temperature difference between the front and rear face outlets (6a, 7a) and the foot outlet (25) in the bi-level outlet mode.

  In addition, since the foot outlet (25) is provided on the vehicle front side of the air conditioning unit (3), the conditioned air is blown from the lower side of the driver seat toward the vehicle front side, and air conditioning is performed on both feet without taking up space or cost. It can be set as the structure where a wind is hit. Moreover, the amount of blowing air from the foot outlet (25) can be increased.

  Further, in the invention according to claim 2, from the rear side of the vehicle to the front side with a predetermined interval between the heating heat exchanger (13) and the heating heat exchanger (13) on the downstream side of the air flow. And a wall (18) protruding to form a hot air passage (19), and a part of the hot air in the hot air passage (19) is mixed with the cold air flowing through the main cold air bypass passage (16). A hot air outflow part (18a) is provided in a part of the wall part (18).

  According to the second aspect of the present invention, it is possible to eliminate the temperature distribution between the front face outlet (6a) and the rear face outlet (7a) when adjusting the temperature in the face blowing mode.

  The invention according to claim 3 is characterized in that the opening ratio adjusting means (26) is a plane sliding door means. This is because the board portion of the plate door or the like is protruded as much as possible in the ventilation path which is the mixing portion of the warm air and the cold air upstream of the face defroster opening (24) and the foot outlet (25), An opening ratio adjustment is performed in the vicinity of the face defroster opening (24) and the foot outlet (25) as much as possible by securing a mixing portion of warm air and cold air.

  According to the third aspect of the present invention, it is possible to prevent the hot air and the cold air from being distributed at the board portion of the plate door before the hot air and the cold air are sufficiently mixed. And the temperature distribution in each blower outlet can be eliminated. The surface slide door means is not limited to a rotary door, and may be a slide door or a film door. Incidentally, the reference numerals in parentheses of the above means are examples showing the correspondence with the specific means described in the embodiments described later.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing the overall configuration of a vehicle air conditioner according to the present invention in a cabin (chamber) 1 of a working machine. 2A is a plan sectional view showing the structure of the air conditioning unit (air conditioner main body) 3 in FIG. 1, and FIG. 2B is a sectional view taken along line AA in FIG.

  As shown in FIG. 1, the vehicle air conditioner according to the present embodiment is mounted in the cabin 1 of various work machine vehicles (for example, a hydraulic excavator, a tractor, etc.) such as a construction machine vehicle and an agricultural machine vehicle. It is. The air conditioner is roughly divided into an air conditioner unit 3 that is installed under the driver's seat 2 and air-conditions and discharges the sucked air, and each air duct that guides air conditioned by the air conditioner unit 3 to the outlet of each part. 1 and is arranged in the form shown in FIG. 1 with respect to the vertical, front-rear and left-right directions of the vehicle.

  As shown in FIG. 2, the air conditioning unit 3 includes a blower 11, an evaporator (cooling heat exchanger) 12, a heater core (heating heat exchanger) 13, and the like, which will be described later, in an air conditioning case 10. 12 and the heater core 13 are arranged side by side in the vehicle left-right direction so that the air blown from the blower 11 flows in the vehicle left-right direction (from left to right in FIG. 2). The air conditioning case 10 forms a passage for conditioned air to be blown into the cabin 1 and is made of a resin molded product having a certain degree of elasticity and excellent strength, such as polypropylene. It is divided into a lower case and formed.

  The divided case is integrally joined by fastening means such as a metal spring clip or a screw after housing the evaporator 12, the heater core 13, and the flow path switching doors 15, 17, 20, 22, 26 described later. The air conditioning case 10 is configured. The blower 11 blows air for air conditioning, and the centrifugal multiblade fan 11b is rotationally driven by a drive motor 11a. By the rotational drive of the centrifugal multiblade fan 11b, the inside of the air conditioning case 10 is driven. The air sucked into the air is blown toward the evaporator 12.

  An inside / outside air switching unit 14 is configured on the suction side of the centrifugal multiblade fan 11b, and the outside / inside air switching door 15 in the inside / outside air switching unit 14 is used to introduce the outside air (vehicle compartment outside air) inlet 14a or the inside air (vehicle interior air). The introduction port 14b is switched and opened and switched between outside air and inside air. The inside / outside air switching door 15 is a flat door, and is integrally coupled to a shaft (rotating shaft) arranged in the vertical direction, and can be rotated rearward and leftward of the vehicle together with the shaft. As shown in FIG. 1, an outside air duct 4 connected to an outside air inlet (not shown) of the cabin 1 is provided on the upstream side of the outside air inlet 14a.

  In the air conditioning case 10, an evaporator (refrigerant evaporator) 12 serving as a heat exchanger for cooling is disposed on the downstream side of the air flow of the blower 11. Inside the evaporator 12, a low-pressure refrigerant of a well-known refrigeration cycle (not shown) flows, and the latent heat of evaporation is absorbed by the refrigerant from the blown air passing through the evaporator 12, and the blown air is cooled.

  A heater core 13 as a heat exchanger for heating is arranged in a posture shown in FIG. 2 at a predetermined interval on the downstream side of the air flow of the evaporator 12. Hot water (engine cooling water) flows from the vehicle engine (not shown) through the heater core 13, and the cold air that has passed through the evaporator 12 is heated using this hot water as a heat source.

  In the air conditioning case 10, a main cold air bypass passage 16 that bypasses the heater core 13 and flows air (cold air) is formed in a side portion of the heater core 13 on the vehicle rear side. And in the upstream part of the vehicle rear side end of the heater core 13 and the main cold air bypass passage 16, air that is heated through the heater core 13 to become hot air and air (cold air) that passes through the main cold air bypass passage 16 are provided. An air mix door 17 is arranged as air volume ratio adjusting means for adjusting the air volume ratio.

  The air mix door 17 is a flat door, and is integrally coupled with a shaft arranged in the vertical direction, and can be rotated in the vehicle longitudinal direction together with the shaft. Further, the cool air from the main cool air bypass passage 16 and the warm air from the heater core 13 are merged into the downstream side of the main cool air bypass passage 16 (on the right side of the vehicle in FIG. 2). A main cold / hot air mixing space 23a is formed.

  Further, in the air conditioning case 10, a sub cold air bypass passage 21 through which air (cold air) flows by bypassing the heater core 13 is formed in a side portion of the heater core 13 on the vehicle front side. The sub cold air bypass passage 21 is provided with a cold air bypass door 22 as a bypass air volume adjusting means for adjusting the opening degree of the sub cold air bypass passage 21 between the heater core 13 and the vehicle front side end.

  The cold air bypass door 22 is a flat door, and is integrally coupled with a shaft arranged in the vertical direction, and can be rotated in the vehicle front-rear direction together with the shaft. The cold air from the auxiliary cold air bypass passage 21 and the hot air from the heater core 13 are merged in the downstream side of the auxiliary cold air bypass passage 21 (the vehicle right side in FIG. 2) to mix the cold air and the hot air. An auxiliary cold / warm air mixing space 23b is formed.

  Further, on the downstream side of the air flow of the heater core 13 (on the right side of the vehicle in FIG. 2), there is provided a wall portion 18 extending from the vehicle rear side to the front side with a predetermined interval between the heater core 13. The wall portion 18 forms a warm air passage 19 that directs the warm air toward the vehicle front side immediately after the heater core 13.

  The hot air passage 19 is provided with a max hot door 20 as hot air variable door means. The max hot door 20 is a flat door, and is a butterfly door in which a shaft arranged in a vertical direction is integrally coupled to a substantial center of the plate portion, and can be pivoted in the vehicle lateral direction about the shaft. It has become. In addition, it arrange | positions so that the end of this Max hot door 20 and the front-end | tip part of the wall part 18 may contact | abut. A part of the wall 18 is provided with a hot air bypass hole 18a serving as a hot air outflow part so that a part of the hot air in the hot air passage 19 is mixed with the cold air flowing through the main cold air bypass passage 16.

  Further, on the right front wall surface of the air conditioning unit 3 is a face that allows air-conditioning air to blow toward the driver's head or air-conditioning air to blow toward the inner surface of the front window glass of the cabin 1. A defroster opening 24 is open. Further, a foot outlet 25 is opened in the wall surface of the air conditioning unit 3 on the vehicle front side, and as shown in FIG. 1, hot air is mainly blown out as heating toward the driver's feet. Yes.

  The face / defroster opening 24 and the foot outlet 25 are supplied with air whose temperature has been adjusted in the mixed air 23a and 23b. The outlet 25 is provided with a first mode door 26 as an opening ratio adjusting means for adjusting the opening ratio. The opening ratio adjusting means is a plane sliding door means. Specifically, the first mode door 26 is a rotary door, and a rotating shaft arranged in a vertical direction and an arc-shaped plate portion 26a are integrated. It can be connected to the front and right sides of the vehicle together with the rotating shaft.

  An outlet switching box 5 is connected to the face / defroster opening 24, and a front face opening 5 a and a defroster opening are provided by a second mode door 51 provided on the vehicle front side in the outlet switching box 5. 5b is opened and closed. Further, the rear face opening / closing door 52 is opened / closed by a rear face opening / closing door 52 provided on the vehicle rear side in the outlet switching box 5.

  As shown in FIG. 1, a front face duct 6 is connected to the front face opening 5a, and cool air is blown out mainly as cooling from the front face outlet 6a on the right front side of the cabin 1 toward the driver's head. It is like that. Further, a defroster duct 7 is connected to the defroster opening 5b so that warm air is blown out from the defroster outlet 7a on the front right side of the cabin 1 toward the inner surface of the front window glass of the cabin 1 as fogging prevention. In addition, a rear face duct 8 is connected to the rear face opening 5c, and cool air is blown out mainly as cooling from the rear face air outlet 8a behind the cabin 1 toward the driver's head. .

  Next, the operation of the present embodiment will be described based on the configuration described above. As is well known, a vehicle air conditioner includes an electronic control device (not shown) to which operation signals from various operation units provided on an air conditioning operation panel and sensor signals from various sensors for air conditioning control are input. The air volume of the blower and the position of each door are controlled by the output signal of this control device.

  First, FIG. 2 shows a face (max cool) blowing mode state. The air mix door 17 fully opens the main cold air bypass passage 16 and the heater core 13 side is fully closed, and the cold air bypass door 22 opens the sub cold air bypass passage 21. The max hot door 20 is fully closed. The first mode door 26 has the face / defroster opening 24 fully open and the foot outlet 25 side fully closed. In the second mode door 51, the front face opening 5a is fully opened and the defroster opening 5b is fully closed. The rear face opening / closing door 52 fully opens the rear face opening 5c.

  The blown air from the blower 11 is cooled by the evaporator 12, passes through the face / defroster opening 24 and the front / rear face ducts 6, 8 from the main / sub cold air bypass passages 16, 21 to the passenger's head from the front / rear face outlets 6 a, 8 a. The air is blown out to cool the cabin 1.

  FIG. 3 is a plan sectional view showing a face (temperature adjustment) blowing mode state in the air conditioner. The air mix door 17, the max hot door 20, and the cold air bypass door 22 are adjusted to an intermediate position from the face (max cool) blowing mode of FIG. As a result, the cold air flowing through the main cold air bypass passage 16 and the hot air passing through the hot air bypass hole 18a from the hot air passage 19 and the cold air flowing through the auxiliary cold air bypass passage 21 and the hot air from the hot air passage 19 are mixed together. Then, the conditioned air whose temperature is equally adjusted is blown out from the front face air outlet 6a and the rear face air outlet 8a, and the temperature in the cabin 1 is adjusted.

  FIG. 4 is a plan sectional view showing a bi-level blowing mode state in the air conditioner. The conditioned air whose temperature has been adjusted is blown out from both the face / defroster opening 24 and the foot outlet 25 with the first mode door 26 in an intermediate position from the face (temperature adjustment) blowing mode of FIG. At this time, conditioned air in which the cold air flowing through the main cold air bypass passage 16 and the hot air passing through the hot air bypass hole 18a from the hot air passage 19 is mixed flows on the face side, and the sub cold air bypass passage is on the foot side. The conditioned air in which the cool air flowing through 21 and the warm air from the warm air passage 19 are mixed flows.

  Since the opening 24 on the face side and the opening 25 on the foot side are formed at positions separated by the rotary door 26, a low air conditioning is provided in the opening 24 on the face side near the mainstream main cold air bypass passage 16. Air is blown out, and since a large amount of hot air from the hot air passage 19 is supplied to the foot-side opening 25 by the Max hot door 20, warm air-conditioned air is blown out. As a result, the face blowing temperature blown to the driver's head becomes lower than the foot blowing temperature blown to the driver's feet, and a comfortable temperature distribution of the head cold foot heat type is obtained as the bi-level blowing mode.

  FIG. 10 is a plan sectional view showing the structure of the air conditioner and the bi-level blowing mode state during the development of the present invention. For example, when the first mode door is a single-axis plate door 28 as shown in FIG. 10, the warm air flowing into the opening 24 on the face side increases due to the board portion of the plate door, and the face blowing temperature rises, and vice versa. In addition, there is a problem that the amount of warm air to the foot-side opening 25 is reduced, the foot blowing temperature is lowered, and the temperature difference of head cold foot heat is reduced.

  FIG. 5 is a plan sectional view showing a foot (temperature adjustment) blowing mode state in the air conditioner. The first mode door 26 is further rotated from the bi-level blow mode shown in FIG. 4 so that the face / defroster opening 24 is fully closed, and the temperature-controlled conditioned air is blown out from the foot blower outlet 25 and the cabin 1 The temperature is adjusted.

  FIG. 6 is a plan sectional view showing a foot (max hot) blowing mode state in the air conditioner. From the foot (temperature control) blowing mode of FIG. 5, the air mix door 17 fully closes the main cold air bypass passage 16 and fully opens the heater core 13 side, and the cold air bypass door 22 fully closes the sub cold air bypass passage 21 and Max Hot The door 20 is fully open. As a result, all the blown air is heated through the heater core 13 and blown out from the foot outlet 25 to heat the cabin 1.

  FIG. 7 is a plan sectional view showing a foot / defroster blowing mode state in the air conditioner. The hot air whose temperature is adjusted is blown out from both the face / defroster opening 24 and the foot outlet 25 from the foot (max hot) blowing mode of FIG.

  In the air outlet switching box 5 in which warm air flows from the face / defroster opening 24, the second mode door 51 fully closes the front face opening 5a, fully opens the defroster opening 5b, and the rear face opening / closing door 52 The side face opening 5c is fully closed. As a result, warm air is blown out from the defroster air outlet 7a through the defroster duct 7 to the inner surface of the front window glass of the cabin 1 and from the foot air outlet 25 to the driver's feet. Are performed simultaneously.

  Finally, FIG. 8 is a plan sectional view showing a defroster blowing mode state in the air conditioner. The first mode door 26 is further rotated from the foot / defroster blowing mode of FIG. 7 to fully close the foot outlet 25, and all the warm air is supplied from the face / defroster opening 24 to the defroster opening 5b. It blows off from the exit 7a to the inner surface of the front window glass of the cabin 1 to prevent fogging of the front window glass.

  Next, features and effects of this embodiment will be described. First, an air conditioner that air-conditions the cabin 1 of various work machine vehicles, the air-conditioning unit 3 is installed below the driver's seat 2 in the cabin 1, and the air-conditioning unit 3 cools the air in the air-conditioning case 10. 12 and a heater core 13 that heats the air that has passed through the evaporator 12. The heat exchangers 12 and 13 are arranged in the vehicle left-right direction so that the air blown from the blower 11 flows in the vehicle left-right direction. A main cold air bypass passage 16 that flows by bypassing the heater core 13 on the rear side of the vehicle and an upstream side position of the heater core 13 and the main cold air bypass passage 16 pass through the heater core 13 and the main cold air bypass passage 16. The air mix door 17 that adjusts the air volume ratio with the air, and the heater core 13 is bypassed on the vehicle front side of the heater core 13 Sub-cooling air bypass passage 21, a cold air bypass door 22 for adjusting the opening degree of the sub-cooling air bypass passage 21, a max hot door 20 provided in the hot air passage 19 on the downstream side of the heater core 13, and the vehicle left and right of the air conditioning unit 3 A face / defroster opening 24 that is provided on the direction side surface and flows out conditioned air for blowing toward the driver's head or conditioned air for blowing toward the front window glass of the cabin 1; A foot air outlet 25 provided on the front side of the vehicle and that blows conditioned air toward the driver's feet, and a first mode door 26 that adjusts the opening ratio of the face defroster opening 24 and the foot air outlet 25 are provided. ing.

  According to this, the mixing section of warm air and cold air is configured in the air conditioning unit 3 as a three-layer flow of the warm air passage 19 and the main and auxiliary cold air bypass passages 16 and 21 in the flow path downstream of the evaporator 12. Accordingly, it is possible to adjust the temperature in each blowing mode of the face-by-level foot, and to eliminate the temperature distribution between the blowing outlets and in each blowing outlet in each blowing mode.

  Further, by adjusting the max hot door 20, air mix door 17 and cold air bypass door 22 provided in the hot air passage 19 and the cold air passages 16 and 21, respectively, the front and rear face outlets 6a It is also possible to freely adjust the temperature difference between 7a and the foot outlet 25.

  Further, since the foot air outlet 25 is provided on the vehicle front side of the air conditioning unit 3, the air conditioned air is blown from the lower side of the driver seat toward the vehicle front side, and the air conditioned air can be applied to both feet without taking up space or cost. It can be a structure. Further, the amount of air blown from the foot outlet 25 can be increased.

  Further, a wall portion 18 is provided on the downstream side of the air flow of the heater core 13 so as to protrude from the vehicle rear side to the front side with a predetermined interval between the heater core 13 and the hot air passage 19 is formed. A warm air outflow portion 18 a is provided in a part of the wall portion 18 so that a part of the warm air in the passage 19 is mixed with the cold air flowing through the main cold air bypass passage 16. According to this, the temperature distribution between the front face outlet 6a and the rear face outlet 7a can be eliminated during temperature adjustment in the face blowing mode.

  Further, the first mode door 26 is a plane sliding door means. This is because hot air and cold air can be produced without causing the board portion of the plate door to protrude as much as possible into the air passage that is the mixing portion of hot air and cold air upstream of the face defroster opening 24 and the foot outlet 25. The opening ratio is adjusted in the vicinity of the face / defroster opening 24 and the foot outlet 25 as much as possible.

  According to this, it is possible to prevent the hot air and the cold air from being mixed at the substrate portion of the plate door before the air is sufficiently mixed, between the air outlets in each air blowing mode, and in each air outlet. The temperature distribution can be eliminated. The surface slide door means is not limited to a rotary door, and may be a slide door or a film door.

(Other embodiments)
FIG. 9 is a cross-sectional plan view illustrating an example of the structure of an air conditioner according to another embodiment of the present invention. In the above-described embodiment, a rotary door is used as the first mode door 26, but the present invention is not limited to the above-described embodiment, and as shown in FIG. As long as the opening 25 can be formed at a position away from the opening 25, the opening / closing door means may be offensive provided separately in the openings 24 and 25, respectively.

  The open / close door means in this case may be a surface slide type or a butterfly type in which the axis is substantially at the center of the plate portion because the substrate portion that protrudes into the ventilation path that is a mixing portion of hot air and cold air can be made small Alternatively, a single-shaft plate-type door may be opened from the far side.

  The cold air bypass door 22 may also be a butterfly type. In the above-described embodiment, the blower 11 is a single-axis fan, but may be a double-axis fan. Further, the inside / outside air switching unit 14 may not be provided, and the blower 11 may be provided separately. Moreover, the blowing mode which can be selected does not necessarily have to be as described above.

It is a perspective view which shows the whole structure of the vehicle air conditioner of this invention in the cabin 1 of a working machine. The structure of the air-conditioning unit 3 in FIG. 1 and a face (max cool) blowing mode state are shown, (a) is a plane sectional view, and (b) is an AA sectional view in (a). It is plane sectional drawing which shows the face (temperature adjustment) blowing mode state in this air conditioner. It is a plane sectional view showing the bilevel blowing mode state in the present air conditioner. It is a plane sectional view showing a foot (temperature adjustment) blowing mode state in the present air conditioner. It is a plane sectional view showing a foot (max hot) blowing mode state in the present air conditioner. It is a plane sectional view showing the foot defroster blowing mode state in this air conditioner. It is a plane sectional view showing a defroster blowing mode state in the present air conditioner. It is a plane sectional view showing an example of the structure of the air-conditioner in other embodiments of the present invention. It is a plane sectional view showing the structure of an air-conditioning device in the middle of development of the present invention, and a bilevel blowing mode state. The structure of the air conditioner in the cabin of the conventional construction machine is shown, (a) is a front view, (b) is a top view. It is a perspective view which shows the structure of the air conditioner in the cabin of the conventional construction machine.

Explanation of symbols

1 ... cabin (cabin)
2 ... Driver's seat 3 ... Air conditioning unit (air conditioner body)
10 ... Air-conditioning case 11 ... Blower (blower means)
12 ... Evaporator (cooling heat exchanger)
13 ... Heater core (heat exchanger for heating)
16 ... Main cold air bypass passage 17 ... Air mix door (air volume ratio adjusting means)
18 ... wall 18a ... warm air bypass hole (warm air outlet)
19 ... Warm air passage 20 ... Max hot door (warm air variable door means)
21 ... Sub cold air bypass passage 22 ... Cool air bypass door (bypass air volume adjusting means)
24 ... Face defroster opening 25 ... Foot outlet 26 ... First mode door (opening ratio adjusting means)

Claims (3)

An air conditioner that air-conditions the cabin (1) of a vehicle for various work machines,
The air conditioning unit (3) is installed below the driver seat (2) in the cabin (1),
The air conditioning unit (3) includes a cooling heat exchanger (12) that cools the air in the air conditioning case (10) and a heating heat exchanger that heats the air that has passed through the cooling heat exchanger (12). 13)
The heat exchangers (12, 13) are arranged in the vehicle left-right direction so that the air blown from the air blowing means (11) flows in the vehicle left-right direction,
A main cold air bypass passage (16) that flows by bypassing the heating heat exchanger (13) on the vehicle rear side of the heating heat exchanger (13);
Air that is disposed upstream of the heating heat exchanger (13) and the main cold air bypass passage (16) and passes through the heating heat exchanger (13) and the main cold air bypass passage (16) An air volume ratio adjusting means (17) for adjusting an air volume ratio with the passing air;
A sub cold air bypass passage (21) that flows by bypassing the heating heat exchanger (13) on the vehicle front side of the heating heat exchanger (13);
Bypass air volume adjusting means (22) for adjusting the opening degree of the auxiliary cold air bypass passage (17);
A hot air variable door means (20) provided in the hot air passage (19) downstream of the heating heat exchanger (13);
Air-conditioning air that is provided on the side surface of the air-conditioning unit (3) in the left-right direction of the vehicle and blows out toward the driver's head or air-conditioning air that blows out toward the front window glass of the cabin (1) is discharged. A face defroster opening (24);
A foot outlet (25) that is provided on the vehicle front side of the air conditioning unit (3) and that blows conditioned air toward the driver's feet;
An air conditioner for vehicles, comprising: an opening ratio adjusting means (26) for adjusting an opening ratio between the face defroster opening (24) and the foot outlet (25). A wall portion (18) projecting from the vehicle rear side to the front side at a predetermined interval from the heating heat exchanger (13) on the downstream side of the air flow of the heating heat exchanger (13). To form a warm air passage (19),
A warm air outlet (18a) is provided in a part of the wall (18) so that a part of the warm air in the warm air passage (19) is mixed with the cold air flowing through the main cold air bypass passage (16). The vehicle air conditioner according to claim 1.   The vehicle air conditioner according to claim 1 or 2, wherein the opening ratio adjusting means (26) is a plane sliding door means.

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