JP2006218908A - Air conditioner for cabin of working machine vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To firstly facilitate maintenance of an outside air filter, to prevent early clogging of an inside air filter caused by sucking of soil dust or the like from a floor surface of an inside air suction part and to further prevent clogging of a drain aperture at water-washing of the inside of a cabin 1. <P>SOLUTION: In the air-conditioning unit 3, inside/outside air introduction switching parts 14a, 14b, 15; a fan 11; an evaporator 12 for cooling air; and a heater core 13 for heating air passing through the evaporator 12 are successively arranged from a rear side of the vehicle in an air-conditioning case 10 toward a front side. Thereby, since the fan 11 becomes layout in the form that it pushes air into the evaporator 12 and the heater core 13, it is not required that throttle is provided on the drain aperture and even if water is intruded from the inside air suction port 14b when the inside of the cabin 1 is washed with water, it can be made to a structure that clogging by mud or the like is hardly generated since air is blown out from the drain aperture. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cabin air conditioner mounted in a cabin (operator's cab) of a vehicle for various work machines for construction, civil engineering, agriculture, and the like. The present invention relates to a cabin air conditioner that can send air-conditioning air that is reasonably temperature-controlled to a driver, can effectively use a narrow installation space, and can comfortably prepare a work environment.

  Conventionally, in cabin air conditioners mounted on vehicles for various work machines such as construction, civil engineering, and agriculture, the space inside the cabin is small, so air conditioning units (air conditioner bodies) are placed behind and below the driver's seat. The air duct is arranged from the air conditioning unit to each outlet in the cabin.

  However, in a work machine vehicle such as a mini excavator with a smaller cabin space, the rear (below) the driver's seat is the engine (E / G) room, and the air conditioning unit is located on the side of the driver's seat in the cabin. It may be mounted on the person's foot side position (see FIG. 3). In addition, examples of this type of cabin air conditioner include those shown in Patent Document 1 and Patent Document 2 below.

  FIG. 3 is a side view showing a configuration example of an air conditioner in the cabin 1 of a recent working machine. 4 is a cross-sectional view showing the structure of the indoor unit 3 in FIG. 3, in which (a) is a side cross-sectional view and (b) is a front cross-sectional view. In recent years, in order to adapt to work in narrow construction sites and roads in urban areas, a vehicle having a smaller vehicle width is required, thereby reducing the width of the cabin 1, and the air conditioning unit 3 shown in FIG. This is an example of being mounted not on the side of the driver but on the side of the driver's feet.

  As shown in FIG. 4, the indoor unit 3 is formed in a vertically placed type, and an evaporator 12 is disposed at a lower position in the air conditioning case 10, a heater core 13 is disposed at an intermediate position, and a blower 11 is disposed at an upper position. The inside air suction port 14 a is provided on the outer side surface of the air conditioning case 10 facing the air filter 12, and the inside air filter 6 is disposed.

  The blower 11 is a double-shaft fan, and the double-shaft motor 11c drives the centrifugal multi-blade fans 11a on both sides, and the rotation shaft is arranged substantially horizontally. Reference numeral 18A denotes a drain portion for draining the condensed water generated in the evaporator 12. 3 is an outside air filter, and 4 is an outside air duct that guides outside air to the indoor unit 3.

A distribution box 9 is provided on the indoor unit 3 (on the outlet side of the blower 11), and the conditioned air is distributed from the distribution box 9 to the front duct 5 and the rear duct 8. The front duct 5 is provided with a face air outlet 5 a that blows out toward the driver's head and a foot defroster air outlet 5 b that blows out toward the driver's feet or the front window glass of the cabin 1. The rear duct 8 is extended to the rear of the cabin 1 and is provided with a rear face outlet 8a that blows out toward the rear of the driver's head.
Japanese Utility Model Publication No. 6-5322 JP 2000-127738 A

  However, the conventional technology has a problem that the inside air suction port is close to the floor surface, so that dust and the like are easily sucked, and the filter is clogged at an early stage. Further, since the blower sucks air with respect to the evaporator, the drain portion has a previously-drawn-type drain hole structure so as not to cause drainage failure due to air inflow due to negative pressure. For this reason, there is a problem that the drain hole is likely to be clogged with mud or the like when water enters from the inside air suction port when washing the cabin.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide an improved cabin air conditioner for a work machine vehicle. One object of the present invention is to facilitate maintenance of the outside air filter section. Another object of the present invention is to prevent early clogging of the inside air filter due to suction of dust or the like from the floor surface of the inside air suction portion. Still another object of the present invention is to prevent drain holes from being clogged during washing in the cabin.

In order to achieve the above object, the present invention employs technical means described in claims 1 to 7. That is, the invention according to claim 1 is an air conditioner that air-conditions the cabin (1) of various work machine vehicles,
Install the air conditioning unit (3) on the side of the driver ’s feet,
The air conditioning unit (3) includes an inside / outside air introduction switching unit (14a, 14b, 15), a blower (11), and a cooling heat exchanger that cools the air from the rear to the front of the vehicle in the air conditioning case (10). (12) The heat exchanger (13) for heating which heats the air which passed the heat exchanger (12) for cooling is arrange | positioned in order.

  According to the first aspect of the present invention, the blower (11) has a layout in which air is pushed into the cooling heat exchanger (12) and the heating heat exchanger (13). Thus, it is not necessary to provide a throttle in the drain hole, and even when water enters the inside air inlet (14b) when washing the cabin (1) with water, mud etc. because air is blown out from the drain hole. It is possible to make the structure difficult to cause clogging.

  According to a second aspect of the present invention, in the cabin air conditioner for a work machine vehicle according to the first aspect, the blower (11) is a double-shaft fan, and the rotation shaft is arranged substantially vertically. Yes. According to the second aspect of the present invention, the cooling heat exchanger (12) and the heating heat exchanger (13) are also formed into a narrow vertically long shape, and the air conditioning unit (3) is made thin. Since it can comprise, habitability can be improved in a narrow cabin (1).

  According to a third aspect of the present invention, in the cabin air conditioner for a work machine vehicle according to the second aspect, an internal air introduction port that constantly introduces internal air on the suction side of the upper fan (11a) of the blower (11). (14a), and a rough air filter (6) is provided.

  According to the third aspect of the invention, the position of the inside air introduction port (14a) is increased with respect to a floor surface with a lot of dust and the inside air filter (6) can be roughened. It is possible to prevent clogging at an early stage. Further, when the cabin (1) is washed with water, it is possible to make it difficult for water to enter from the inside air suction port 14b.

  Even if water enters from the inside air introduction port (14a), the water does not enter the drain pan portion and is discharged from the attachment portion of the outside air filter (7). It has a structure that is difficult to produce. In addition, the air volume can be ensured by disposing a coarse air filter (6) having a small pressure loss at the upper internal air inlet (14a).

  Moreover, in invention of Claim 4, in the cabin air conditioner of the working machine vehicle in any one of Claim 2 or Claim 3, it is inside and outside to the suction side of the lower fan (11b) of a fan (11). An air switching means (15) is provided, and a fine outside air filter (7) is disposed between the lower fan (11b) and the inside / outside air switching means (15).

  According to the fourth aspect of the present invention, the outside air filter (7) can be easily attached and detached from the cabin (1), and maintenance can be improved. Further, since the filter on the side close to the floor surface with a lot of dust and the like is provided with a fine air filter (7), the air for air conditioning can be kept clean.

  According to the fifth aspect of the present invention, in the cabin air conditioner for the work machine vehicle according to the first aspect, the conditioned air that has passed through the cooling heat exchanger (12) and the heating heat exchanger (13). Flows into the front blowing duct (5) and blows out from the front blowing duct (5), and the front blowing duct (5) blows out toward the driver's head and a driver's feet or cabin. A foot defroster outlet (5b) that blows out toward the front window glass of (1) is provided. According to the fifth aspect of the invention, the basic cooling, heating, and anti-fogging functions can be realized with a simple configuration.

  According to a sixth aspect of the present invention, in the cabin air conditioner for the work machine vehicle according to the first aspect, the cooling is performed between the cooling heat exchanger (12) and the heating heat exchanger (13). It is characterized in that a cold air outlet (16) for taking out a part of the air cooled by the heat exchanger (12) is provided. According to the sixth aspect of the present invention, the cold air can be taken out simply by providing an opening in the air conditioning case (10).

  According to a seventh aspect of the present invention, in the cabin air conditioner for a work machine vehicle according to the sixth aspect, a rear face outlet (for blowing cold air toward the rear of the driver's head behind the cabin (1)). 8a) is provided, and the cold air led out from the cold air outlet (16) is guided to the rear face air outlet (8a). According to the seventh aspect of the present invention, it is possible to easily provide a rear face blowing function for blowing cold air toward the rear of the driver's head. 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 side view showing an overall configuration of an air conditioner of the present invention in a cabin 1 of a work machine. 2 is a cross-sectional view showing the structure of the indoor unit 3 in FIG. 1, in which (a) is a plan cross-sectional view and (b) is a front cross-sectional view.

  As shown in FIG. 1, the cabin air conditioner according to the present embodiment is mounted in a cabin (operating cab) 1 of various work machine vehicles (for example, hydraulic mini-excavators) for construction, civil engineering, and agriculture. There is a driver's seat 2 in FIG. This air conditioner is broadly divided into an indoor unit (air conditioner body) 3 that is installed at the driver's foot side position in the cabin 1 and air-conditions and discharges the sucked air, and air conditioned by the indoor unit 3 is divided into various parts. 1 are arranged in the form shown in FIG. 1 with respect to the vertical and longitudinal directions of the vehicle.

  The indoor unit 3 has a flat rectangular parallelepiped shape and is provided along the wall surface on the opposite side to the cabin door. The indoor unit 3 is provided with the main plane along the wall surface. The indoor unit 3 has an air suction port at a portion disposed on the rear side of the vehicle interior, and has an air blowing portion at a portion disposed on the front side of the vehicle interior. And an adjustment unit.

  As shown in FIG. 2, the indoor unit 3 includes an inside air introduction port 14a, an outside air introduction port 14b, and an inside / outside air switching door 15 as an inside / outside air introduction switching unit from the rear of the vehicle in the air conditioning case 10 to the front side. The blower 11, the evaporator 12 that cools the air, and the heater core 13 that heats the air that has passed through the evaporator 12 are built in in order, so that the air blown from the blower 11 flows from the vehicle rear side to the front side. Is arranged.

  First, the air-conditioning case 10 forms a passage for conditioned air that blows into the cabin 1, and is made of a resin molded product that has some elasticity and excellent strength, such as polypropylene. Is divided into a right case and a left case. The divided cases accommodate the blower 11, the evaporator 12, the heater core 13, the inside / outside air switching door 15 and the like, and then are integrally coupled by a fastening means such as a metal spring clip or a screw to constitute the air conditioning case 10.

  The blower 11 blows air for air conditioning. Specifically, the blower 11 is a double-shaft fan, and the double-shaft motor 11c drives the centrifugal multiblade (sirocco) fans 11a and 11b on both sides. The air sucked into the air conditioning case 10 is blown toward the evaporator 12 by the rotational driving of the fans 11a and 11b. In addition, the rotating shaft is arrange | positioned substantially perpendicularly.

  The suction side of the upper fan 11a is an inside air introduction port 14a that always sucks air (inside air) in the cabin 1, and a rough air filter 6 is provided between the upper fan 11a and the upper fan 11a. . Further, an inside / outside air switching section is formed on the suction side of the lower fan 11b, and an inside / outside air switching door 15 as an inside / outside air switching means in the inside / outside air switching section is used as an inside air (cabin inside air) inlet 14a or outside air. (Cabinet outside air) The introduction port 14b is switched and opened to switch between outside air and inside air (see FIG. 2A).

  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 introduction port 4 connected to an outside air intake port on the lower surface of the cabin 1 is provided on the upstream side of the outside air introduction port 14a.

  A fine outside air filter 7 is disposed between the lower fan 11 b and the inside / outside air switching door 15. The inside air and outside air filters 6 and 7 can be detached from the cabin, and maintenance is easy. Although not shown, the air conditioning case 10 below the attachment portion of the outside air filter 7 is provided with a hole for discharging water that has entered from the inside air introduction port 14 a to the outside of the indoor unit 3.

  In this embodiment, the inside air introduction port 14 a is opened on the surface in the vicinity of the seat of the indoor unit 3. The inside air introduction port 14 a is formed as an opening that extends in the vertical direction on the side surface of the indoor unit 3. The inside air introduction port 14a has an opening located on the upper side of the room and an opening located on the lower side.

  The air conditioning case 10 is divided into two parts in the vertical direction on the blower 11 and its upstream side. In the air conditioning case 10, a partition wall that divides the upstream portion of the air conditioning case 10 into two parts in the vertical direction is provided at substantially the center in the vertical direction. The blower 11 includes an upper blower disposed in an air passage above the partition, a lower blower disposed in an air passage below the partition, and one electric motor disposed between these two blowers.

  Each of the upper blower and the lower blower includes a blower shroud and upper and lower suction type sirocco fans 11a and 11b disposed therein. The sirocco fan 11a of the upper blower and the sirocco fan 11b of the lower blower are respectively connected to rotating shafts extending from both upper and lower sides of the electric motor 11c, and are driven to rotate by the electric motor 11c.

  The air passage above the partition is always in communication with the upper opening of the inside air inlet 14a. The air passage below the partition wall selectively communicates with the lower opening or the outside air introduction port 14b of the inside air introduction port 14a as the inside / outside air switching door 15 is switched. This configuration allows a large opening of the inside air introduction port 14a and makes it possible to reduce the rate at which the inside air introduction port 14a opens at a site close to the floor surface in the cabin.

  In addition, since the lower opening of the inside air introduction port 14a is selectively used as the outside air introduction port 14b, the lower opening is relatively open and the opportunity to suck in air is relatively reduced. Opportunities to inhale garbage etc. are reduced. Furthermore, even if the lower opening of the inside air introduction port 14a becomes dirty and clogged or is blocked by an article placed on the floor, the inside air introduction port 14a extends in the vertical direction in the room. Since the inside air is introduced by the upper blower that is open and the upper opening is independent from the lower opening, the operation as the air conditioner can be continued.

  On the downstream side of the blower 11, an evaporator 12 is disposed as a vertically long cooling heat exchanger with a predetermined interval. 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. In addition, a drain hole 18 is formed below the evaporator 12 to discharge condensed water generated when cooled by the evaporator 12 from the bottom of the air conditioning case 10 to the outside of the cabin 1.

  On the downstream side of the evaporator 12, a heater core 13 is disposed as a vertically long heat exchanger with a predetermined interval. High-temperature hot water (engine cooling water) flows from the vehicle engine (not shown) to 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. The supply amount of this hot water is controlled by a water valve (not shown).

  A cold air outlet 16 is provided between the evaporator 12 and the heater core 13 for taking out part of the air cooled by the evaporator 12, and the cold air derived therefrom passes through the rear duct 8 and passes through the cabin. A cool air is blown out mainly as cooling from a rear face air outlet 8a provided at the rear of the vehicle 1 toward the driver's back of the head (see FIG. 1).

  In addition, the conditioned air that has passed through the evaporator 12 and the heater core 13 toward the front of the vehicle flows into the front blowing duct 5 from the cold / hot air outlet 17 and is blown out from there. Is a face outlet 5a that blows out cool air mainly as a cooling air toward the driver's head, and blows warm air mainly as heating toward the driver's feet, or toward the inner surface of the front window glass of the cabin 1. A foot defroster outlet 5b for blowing warm air is provided to prevent fogging. In FIG. 1, C is a console, and E / G is an engine.

  In this configuration, the blower 11 is turned on and off, the air volume is adjusted, and the compressor is turned on and off by a switch provided on an air conditioning operation panel (not shown), and the water valve is directly operated by a lever provided on the air conditioning operation panel (not shown).

  In addition, this configuration includes an electronic control device (not shown) to which sensor signals from various sensors for air conditioning control (not shown) are input, and a compressor (refrigerant compressor) (not shown) is controlled by an output signal of the control device. In this embodiment, the water valve is a direct-acting type using a lever provided on the panel, but an operating method using a servo motor and an operating method via a cable may be implemented.

  In this embodiment, the inside / outside air switching by the inside / outside air switching door 15 is manual, but it may be electric. Moreover, each blower outlet 5a * 5b * 8a becomes a structure which switches a wind direction adjustment and the outflow of a wind by the direction and opening / closing of the louver part of the blowing grill provided in each.

  Next, an outline of the operation of the present embodiment will be described based on the configuration described above. During cooling: The louver portion of each air outlet drives the compressor and the condenser fan with the face air outlet 5a and the rear face air outlet 8a open, the foot defroster air outlet 5b closed, and the water valve closed. As a result, the evaporator 12 is cooled, and the conditioned air cooled by exchanging heat with the evaporator 12 is not heated by the heater core 13 but is blown out from the face air outlet 5a and the rear face air outlet 8a to give the driver a feeling of cooling. give.

  During heating: The louver part of each outlet opens the foot defroster outlet 5b, closes the face outlet 5a and the rear face outlet 8a, opens the water valve without driving the compressor and the condenser fan. . As a result, the conditioned air that has passed through the evaporator 12 and is heated by exchanging heat with the heater core 13 is blown out from the foot defroster outlet 5b to give the driver a feeling of cooling and, if necessary, the front window glass. Stop fogging.

  Next, features and effects of this embodiment will be described. First, the air conditioning unit 3 is installed on the side of the driver's feet, and the air conditioning unit 3 moves from the rear of the vehicle in the air conditioning case 10 to the front side, the inside / outside air introduction switching units 14a, 14b, 15, the blower 11, the air An evaporator 12 that cools the heater and a heater core 13 that heats the air that has passed through the evaporator 12 are arranged in this order.

  According to this, since the blower 11 has a layout in which air is pushed into the evaporator 12 and the heater core 13, there is no need to provide a throttle in the drain hole as in the conventional case, and the interior of the cabin 1 is washed with water. Even when water intrudes from the inside air inlet 14b at times, air is blown out from the drain hole, so that the structure is less likely to be clogged with mud or the like.

  In addition, the blower 11 is a double-axis fan, and the rotation axis is arranged substantially vertically. According to this, since the air conditioner unit 3 can be configured to be thin in combination with the evaporator 12 and the heater core 13 having a narrow vertically long shape, the comfortability in the cabin 1 having a narrow width can be improved.

  In addition, the suction side of the upper fan 11a of the blower 11 is an inside air introduction port 14a that constantly introduces the inside air, and a rough air filter 6 is provided. According to this, the position of the inside air introduction port 14a becomes higher with respect to the floor surface with a lot of dust and the like, and the eyes of the inside air filter 6 can be roughened, so that it is possible to prevent clogging early. it can. Further, when the cabin 1 is washed with water, it is possible to make it difficult for water to enter from the inside air suction port 14b.

  In addition, even if water enters from the inside air introduction port 14a, the water does not enter the drain pan portion and is discharged from the mounting portion of the outside air filter 7, so that the drain hole is not easily clogged. It has become. Further, the air volume can be ensured by disposing the coarse air filter 6 having a small pressure loss at the upper internal air inlet 14a.

  Further, an inside / outside air switching door 15 is provided on the suction side of the lower fan 11 b of the blower 11, and a fine outside air filter 7 is disposed between the lower fan 11 b and the inside / outside air switching door 15. According to this, it becomes possible to easily attach and detach the outside air filter 7 from the cabin 1, and it is possible to improve maintenance. Further, since the filter on the side close to the floor with much dust and the like is provided with the fine air filter 7, the air for air conditioning can be kept clean.

  In addition, the conditioned air that has passed through the evaporator 12 and the heater core 13 flows into the front blowing duct 5 and blows out from the front blowing duct 5, and the face blowing outlet 5a blows out toward the driver's head in the front blowing duct 5. And a foot defroster outlet 5b that blows out toward the driver's feet or the front window glass of the cabin 1 is provided. According to this, basic cooling, heating and anti-fogging functions can be realized with a simple configuration.

  Further, a cold air outlet 16 is provided between the evaporator 12 and the heater core 13 to take out part of the air cooled by the evaporator 12. According to this, it is possible to easily take out cold air simply by providing an opening in the air conditioning case 10. Further, a rear face air outlet 8a that blows out cold air toward the rear of the driver's head is provided behind the cabin 1, and the cool air led out from the cold air outlet 16 is guided to the rear face air outlet 8a. According to these, it is possible to easily provide a rear face blowing function for blowing cold air toward the rear of the driver's head.

(Other embodiments)
In the above-described embodiment, the cold air outlet 16 is normally open. However, the present invention is not limited to the above-described embodiment, and a door interlocked with a water valve may be provided to be opened and closed. In the above-described embodiment, the cold air outlet 16 is used for blowing the rear face, but it may be used for a refrigerator box or the like. Further, the cold air outlet 16 may not be configured.

  In the above-described embodiment, the air conditioning unit 3 is a reheat system using a water valve, but may be an air mix system using an air mix door. Further, in the above-described embodiment, the outside air intake is on the lower surface of the cabin, but may be from another part. The air conditioning unit 3 may be installed on either the left or right side of the vehicle.

It is a side view which shows the whole structure of the air conditioner of this invention in the cabin 1 of a working machine. It is sectional drawing which shows the structure of the indoor unit 3 in FIG. 1, (a) is planar sectional view, (b) is front sectional view. It is a side view which shows the structural example of the air conditioner in the cabin 1 of the working machine of recent years. It is sectional drawing which shows the structure of the indoor unit 3 in FIG. 3, (a) is side sectional view, (b) is front sectional view.

Explanation of symbols

1 ... cabin (cab)
3 ... Indoor unit (air conditioner body)
DESCRIPTION OF SYMBOLS 5 ... Front side outlet duct 5a ... Face outlet 5b ... Foot defroster outlet 6 ... Filter for inside air 7 ... Filter for outside air 8a ... Rear face outlet 10 ... Air-conditioning case 11 ... Blower, both-axis fan 11a ... Upper fan 11b ... Lower fan 12 ... Evaporator (cooling heat exchanger)
13 ... Heater core (heat exchanger for heating)
14a ... Inside air introduction port (inside / outside air introduction switching unit)
14b ... Outside air introduction port (inside / outside air introduction switching unit)
15 .. Inside / outside air switching door (inside / outside air introduction switching unit, inside / outside air switching means)
16 ... Cool air outlet

Claims (7)

An air conditioner that air-conditions the cabin (1) of a vehicle for various work machines,
Install the air conditioning unit (3) on the side of the driver ’s feet,
The air-conditioning unit (3) includes an internal / external air introduction switching unit (14a, 14b, 15), a blower (11), and heat exchange for cooling that cools air from the rear to the front of the vehicle in the air-conditioning case (10). An air conditioner for a cabin of a work machine vehicle, wherein a heat exchanger (13) for heating the air that has passed through the heat exchanger (12) and the cooling heat exchanger (12) are arranged in this order.   The air conditioner for a cabin of a work machine vehicle according to claim 1, wherein the blower (11) is a double-shaft fan, and the rotation shaft thereof is arranged substantially vertically.   The suction side of the upper fan (11a) of the blower (11) is an inside air introduction port (14a) for constantly introducing inside air, and a rough air filter (6) is provided. The cabin air conditioner for a work machine vehicle according to any one of claims 2 and 3.   Inside / outside air switching means (15) is provided on the suction side of the lower fan (11b) of the blower (11), and between the lower fan (11b) and the inside / outside air switching means (15) is fine. The air conditioner for a cabin of a work machine vehicle according to claim 2, further comprising an outdoor air filter (7).   The conditioned air that has passed through the cooling heat exchanger (12) and the heating heat exchanger (13) flows into the front blowing duct (5) and blows out therefrom, and the front blowing duct (5 ) Is provided with a face outlet (5a) that blows out toward the driver's head and a foot defroster outlet (5b) that blows out toward the driver's feet or the front window glass of the cabin (1). The cabin air conditioner for a work machine vehicle according to claim 1.   Between the cooling heat exchanger (12) and the heating heat exchanger (13), a cold air outlet (16) for taking out part of the air cooled by the cooling heat exchanger (12) is provided. The cabin air conditioner for a work machine vehicle according to claim 1, wherein the air conditioner is provided.   A rear face air outlet (8a) that blows out toward the rear of the driver's head is provided behind the cabin (1), and the cool air led out from the cold air outlet (16) is guided to the rear face air outlet (8a). The cabin air conditioner for a work machine vehicle according to claim 6.

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