JP2008120251A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the inspection and cleaning of the heat exchanger of an air conditioner for a vehicle. <P>SOLUTION: The air conditioner comprises a case 21 disposed to a space 15 formed in a cabin 10, and the heat exchanger 24 housed in the case 21 to perform heat exchange with air. The case 21 is adjacent to a peripheral wall part 12 of the cabin 10, and a case-side opening part 40 opened/closed by a case-side cover 41 is formed to an area adjacent to the peripheral wall part 12 in the case 21. The case-side opening part 40 is overlapped with a cabin-side opening part 42 formed in the peripheral wall part 12 and opened/closed by a cabin-side cover 43, and a heat exchange core part 24a of the heat exchanger 24 is opposed to the case-side opening part 40. Therefore, the heat exchanger 24 is checked and cleaned from the outside of the cabin 10, with the heat exchanger 24 housed in the case 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner and is suitable for use in a construction machine such as a hydraulic excavator.

  Conventionally, in a vehicle air conditioner, a cooling heat exchanger (evaporator) is housed in a case of a vehicle interior air conditioning unit. When inspecting and cleaning (maintenance) the cooling heat exchanger arranged in such a case, the cooling heat exchanger is taken out from the case of the air conditioning unit in a narrow vehicle interior space and then cooled. The heat exchanger needs to be checked and cleaned. For this reason, a great deal of time has been spent on checking and cleaning the cooling heat exchanger.

  Therefore, Patent Document 1 proposes a vehicle air conditioner that can check and clean the cooling heat exchanger in a short time. In this prior art, for example, in a vehicle such as a truck in which an air conditioning unit is disposed immediately behind the front panel of the vehicle, an opening for taking out a cooling heat exchanger is provided on both the front surface of the case of the air conditioning unit and the front panel of the vehicle. The parts are superposed. Both openings can be opened and closed by a cover.

  As a result, when inspecting and cleaning the cooling heat exchanger, the cover is first operated to open both openings, and then the cooling heat exchanger is passed through the openings from the case of the air conditioning unit to the front of the vehicle (outside the vehicle). Can be taken out.

That is, in this prior art, the cooling heat exchanger can be directly taken out of the vehicle, so that it is not necessary to take out the cooling heat exchanger in a narrow vehicle interior space. For this reason, the time spent for checking and cleaning the cooling heat exchanger can be shortened.
Japanese Utility Model Publication No. 5-56516

  However, in the above prior art, since the cooling heat exchanger is taken out from the case of the air conditioning unit, there is a problem that it takes time and effort to remove the refrigerant pipe from the cooling heat exchanger. There is also a problem that it takes time to remove the refrigerant from the refrigerant circuit of the vehicle air conditioner before removing the refrigerant pipe.

  In particular, construction machines such as hydraulic excavators are used in dusty environments such as sand dust, so dust adheres to the fine fin gaps of the heat exchange core of the cooling heat exchanger, and the heat exchange core Clogging is likely to occur. For this reason, the frequency of inspection and cleaning of the heat exchanger for cooling increases, and the above problem becomes remarkable.

  In addition, the above problem occurs not only in the heat exchanger for cooling but also in the heat exchanger for heating.

  In view of the above points, an object of the present invention is to facilitate inspection and cleaning of a heat exchanger of a vehicle air conditioner.

In order to achieve the above object, the present invention includes a case (21) disposed in a vehicle interior space (15) formed in the cabin (10) and forming an air passage through which air flows.
A heat exchanger (24) that is housed in a case (21) and exchanges heat with air;
A case (21) is disposed adjacent to the peripheral wall (12) of the cabin (10);
A case side opening (40) that is opened and closed by a case side cover (41) is formed in a part of the case (21) adjacent to the peripheral wall portion (12).
The case side opening (40) is superposed on the cabin side opening (42) opened to the peripheral wall (12) and opened and closed by the cabin side cover (43),
The heat exchange core part (24a) of the heat exchanger (24) is arranged to face the case side opening (40).

  According to this, the heat exchange core part (24a) of the heat exchanger (24) can be exposed outside the cabin (10) by opening the case side opening (40) and the cabin side opening (42). it can.

  In other words, the heat exchange core part (24a) of the heat exchanger (24) can be inspected and cleaned from the outside of the cabin (10) while being housed in the case (21).

  For this reason, when inspecting and cleaning the heat exchanger (24), it is not necessary to take out the heat exchanger (24) from the case (21). Moreover, it is not necessary to check and clean the heat exchanger (24) in the narrow cabin (10). As a result, the heat exchanger (24) can be easily inspected and cleaned.

  Since the case side cover (41) and the cabin side cover (43) can close the case side opening (40) and the cabin side opening (42) except when checking and cleaning the heat exchanger (24), The original function (function to form an air passage) of the case (21) is not impaired by the case side opening (40), and the original function (vehicle interior) of the cabin (10) is not affected by the cabin side opening (42). The function of forming the space (15) is not impaired.

  Specifically, in the present invention, since the upstream portion of the air flow in the heat exchange core portion (24a) faces the case side opening (40), the heat exchange core portion (24a) to which dust is more likely to adhere. ) Can be easily inspected and cleaned on the upstream side of the air flow.

Further, in the present invention, specifically, the peripheral wall portion is the rear wall portion (12) of the cabin (10),
The case (21) is arranged on the rear side in the cabin (10),
A heat exchanger (24) is housed on the rear side in the case (21).

  Thereby, a heat exchanger (24) can be inspected and cleaned from the cabin (10) rear side.

Further, in the present invention, specifically, the area of the case side cover (41) is smaller than the area of the cabin side opening (42),
The case side cover (41) is detachably fixed to the case (21),
The case side opening (40) is opened and closed by attaching and detaching the case side cover (41).

  According to this, since the case side opening (40) is opened and closed by attaching and detaching the case side cover (41), the opening and closing structure of the case side opening (40) can be simplified.

  Moreover, since the area of the case side cover (41) is smaller than the area of the cabin side opening (42), the removed case side cover (41) is removed from the case side opening (40) to the cabin (10) outside. Can be taken out. For this reason, the removed case side cover (41) does not interfere with the inspection and cleaning of the heat exchanger (24).

Further, in the present invention, specifically, the area of the case side cover (41) is smaller than the area of the cabin side opening (42),
The case side cover (41) is supported so as to be swingable with respect to the case (21) in a direction perpendicular to the opening direction of the case side opening (40).
The case side opening (40) is opened and closed by swinging the case side cover (41),
Further, when the case-side cover (41) is swung in a direction to open the case-side opening (40), the case-side cover (41) protrudes outside the cabin (10) through the cabin-side opening (42). It may be.

  Thereby, the case side opening (40) can be easily opened and closed by the case side cover (41).

Further, in the present invention, specifically, the case side cover (41) is supported so as to be parallel to the case (21) in a direction perpendicular to the opening direction of the case side opening (40). ,
The case side opening (40) is opened and closed by the parallel movement of the case side cover (41),
Further, the case side cover (41) may be moved in parallel in the vehicle interior space (15).

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
1 to 3 show a first embodiment of the present invention, in which a vehicle air conditioner according to the present invention is applied to a construction machine, specifically, a hydraulic excavator. FIG. 1 is a schematic cross-sectional view of a cabin (operator's cab) of a hydraulic excavator according to the present embodiment, FIG. 2 is a two-side view of an air-conditioning unit section in FIG. 1, and FIG. FIG. The front and rear, top and bottom, left and right arrows in FIGS.

  A cabin 10 of a hydraulic excavator has a peripheral wall portion including a front wall portion 11, a rear wall portion 12, a ceiling wall portion 13, a floor surface wall portion 14, and left and right side wall portions (not shown). A vehicle interior space 15 surrounded by the portion is formed. The upper part of the front wall part 11 is constituted by a front glass 16, and the upper part of the rear wall part 12 is constituted by a rear glass 17. An occupant door (not shown) is disposed on at least one of the left and right side wall portions.

  A seat 18 on which an occupant of a hydraulic excavator sits is disposed substantially at the center of the floor wall portion 14. An air conditioning unit 20 is mounted at the rear and lower part of the seat 18, that is, at the rearmost part and the lowermost part of the vehicle interior space 15. In FIG. 1, for convenience of illustration, the shape of the air conditioning unit 20 is simplified.

  Next, a specific configuration of the air conditioning unit 20 will be described. The air conditioning unit 20 has a case 21 having a box shape, and an air passage through which air flows is formed inside the case 21.

  The case 21 is formed of a resin material having a certain degree of elasticity such as polypropylene and excellent in strength. For convenience of forming, the case 21 is divided into a plurality of divided cases. And case 21 is comprised by fastening a some division | segmentation case integrally using fastening means, such as a screw and a metal spring clip.

  In this example, the blower part 22 is integrally arranged on the side wall part of the case 21. The blower unit 22 includes a centrifugal blower fan 22b that is rotationally driven by a motor 22a, and a scroll casing 22c that houses the blower fan 22b.

  Since the rotating shaft (not shown) of the blower fan 22b is arranged in the vertical direction, the air inlet 22d of the blower unit 22 is arranged on the upper surface of the scroll casing 22c. The air outlet portion 22e of the blower portion 22 opens toward the case 21 side (the right side in FIG. 2A) on the rear side (the lower side in FIG. 2A) of the scroll casing 22c.

  An inside / outside air switching box 23 for switching and introducing inside air and outside air is disposed on the upper surface of the blower unit 22. An outside air introduction port 23a is formed in the rear wall portion of the inside / outside air switching box 23, and the outside air introduction port 23a is opened and closed by an outside air door (plate door) (not shown). Also, an inside air introduction port 23b is formed in the front wall portion of the inside / outside air switching box 23, and the inside air introduction port 23b is opened and closed by an inside air door (plate door) (not shown).

  In this example, an electric actuator (not shown) made of a servo motor is used as a drive mechanism for rotationally driving the outside air door and the inside air door. Further, as a drive mechanism for the outside air door and the inside air door, the manual operation force of an inside / outside air switching operation member (for example, a manual operation lever) provided on an air conditioning operation panel (not shown) is supplied via a cable, a link mechanism, etc. You may use the manual operation mechanism which transmits to the rotating shaft of a door.

  In the outside air introduction mode, the outside air door is operated to the fully open position of the outside air introduction port 23a, and the inside air door is operated to the fully closed position of the inside air introduction port 23b. Thus, outside air is taken into the inside / outside air switching box 23 from the outside air introduction port 23a via an outside air port and an outside air duct (not shown).

  On the other hand, in the inside air introduction mode, the outside air door is operated to the fully closed position of the outside air introduction port, and the inside air door is operated to the fully open position of the inside air introduction port 23b. Thereby, the inside air is taken into the inside / outside air switching box 23 from the inside air introduction port 23b.

  Further, in the inside / outside air introduction mode, both the outside air door and the inside air door are operated to the fully open positions of the outside air introduction port 23a and the inside air introduction port 23b. Thereby, the outside air and the inside air are simultaneously taken into the inside / outside air switching box 23 from the outside air introduction port 23a and the inside air introduction port 23b.

  On the rear side (right side in FIG. 3) inside the case 21, a substantially rectangular cooling heat exchanger 24 is disposed substantially vertically over the entire width of the case 21. Thereby, between the cooling heat exchanger 24 and the rear surface wall portion 21a of the case 21, the air (inside air / outside air) blown from the air outlet portion 22e of the blower portion 22 toward the case 21 flows. A space 25 is formed.

  Thus, the entire amount of air (inside air / outside air) flowing into the case 21 from the air outlet portion 22e of the blower portion 22 passes through the cooling heat exchanger 24 from the inflow space 25 side as indicated by an arrow a.

  The cooling heat exchanger 24 is an evaporator of a refrigeration cycle, and has a heat exchange core portion 24a composed of a plurality of tubes through which a refrigerant passes and fins joined to the outer surface of the tubes as is well known. Yes. Air passes through the gap of the heat exchange core 24a, and the low-temperature low-pressure refrigerant in the refrigeration cycle absorbs heat from the passing air and evaporates to cool the air.

  The cooling heat exchanger 24 in this example has a tank portion 24b that distributes or collects refrigerant to a plurality of tubes at its upper and lower ends.

  In addition, the compressor (not shown) which circulates the refrigerant | coolant of a refrigerating cycle is driven by the engine (not shown) of a hydraulic shovel via an electromagnetic clutch.

  Inside the case 21, a heating heat exchanger 26 having a substantially rectangular shape is disposed on the downstream side (front side of the vehicle) and the lower side of the cooling heat exchanger 24. The heating heat exchanger 26 is disposed over the entire width of the case 21.

  The heating heat exchanger 26 is a hot water type heat exchanger that heats air using the cooling water (hot water) of the engine of a hydraulic excavator as a heat source, and as is well known, a plurality of tubes through which hot water passes and the outer surface of the tubes And a heat exchange core portion 26a composed of fins joined to each other. The air in the heater passage 36 passes through the gap portion of the heat exchange core portion 26a and is heated.

  The heating heat exchanger 26 in this example is a so-called all-pass type having a tank portion 26b for distributing or collecting hot water to a plurality of tubes at the upper and lower ends, and the lower tank portion is a hot water inlet. It constitutes the tank part.

  A plate-shaped air mix door 27 is disposed above the heating heat exchanger 26, and the rotating shaft 27 a of the air mix door 27 is disposed near the upper end of the heating heat exchanger 26.

  The rotary shaft 27a of the air mix door 27 is arranged so as to extend in the direction perpendicular to the plane of the drawing (vehicle width direction) in FIG. 3, and both ends of the rotary shaft 27a are bearing holes (not shown) on the left and right side wall surfaces of the case 21. Is held rotatably. One end of the rotating shaft 27a protrudes outside the case 21 and is connected to a driving mechanism (not shown).

  In the case 21, on the downstream side of the air flow of the cooling heat exchanger 24 and above the heating heat exchanger 26, a cold air bypass that bypasses the heating heat exchanger 26 and flows the cold air as shown by an arrow b. A passage 28 is formed. On the other hand, in the case 21, a hot air passage 29 through which the warm air heated by the heating heat exchanger 26 flows as shown by an arrow c is provided on the downstream side (front side of the vehicle) of the air flow of the heating heat exchanger 26. Is formed.

  A hot air guide wall 31 protruding upward is formed integrally with the case 21 at a vehicle front side portion of the heating heat exchanger 26 in the lower surface 21 b of the case 21. The hot air guide wall 31 defines the vehicle front side of the hot air passage 29 and guides the hot air flow in the hot air passage 29 toward the cold air bypass passage 28 as indicated by an arrow c.

  As a result, an air mixing section 32 is formed on the upper side of the hot air passage 29 and around the tip of the hot air guide wall 31 so that the hot air and the cold air can be mixed well.

  In FIG. 1, the solid line position of the air mix door 27 is the maximum cooling position where the ventilation passage of the heating heat exchanger 26 is fully closed and the cold air bypass passage 28 is fully opened, and the two-dot chain line position is the cold air bypass passage 28. This is the maximum heating position that is fully closed and fully opens the ventilation path of the heat exchanger 26 for heating.

  As is well known, the air mix door 27 has an air volume ratio between the warm air passing through the heating heat exchanger 26 (arrow c) and the cold air passing through the cold air bypass passage 28 bypassing the heating heat exchanger 26 (arrow b). Is a temperature adjusting means for adjusting the temperature of the air blown into the vehicle interior by adjusting. Then, the hot air (arrow c) and the cold air (arrow b) are mixed in the air mixing unit 32 to obtain air at a desired temperature.

  A face / difference passage 33 communicating with the air mixing section 32 is formed in the case 21 above the cold air bypass passage 28. The face / diff passage 33 is formed to extend from the front of the vehicle to the rear of the vehicle. A front face / differential opening 34 is opened in a side wall on the front side of the vehicle in the face / differential passage 33. In addition, a rear face opening 35 is opened in the upper surface of the face / diff passage 33 on the vehicle rear side.

  A front face / differential duct (not shown) extending toward the front side of the vehicle is connected to the front face / differential opening 34, and an occupant is provided from the front face outlet and the differential outlet at the downstream end of the front face / differential duct. The air is blown out toward the face portion and the front glass 16.

  Note that a shut mechanism (not shown) is provided at each of the front face air outlet and the differential air outlet, and the front face air outlet and the differential air outlet can be opened and closed by the shut mechanism. This shut mechanism is opened and closed by a passenger's manual operation.

  A rear face duct (not shown) extending upward is connected to the rear face opening 35, and air is blown out from the rear face outlet at the downstream end of the rear face duct toward the occupant's face. It is like that.

  In the case 21, a foot passage 36 communicating with the air mixing unit 32 is formed on the vehicle front side of the warm air passage 29. The foot passage 36 is formed so as to hang downward from above.

  A foot opening 37 is opened in the front wall portion below the foot passage 36. A foot duct (not shown) extending toward the front side of the vehicle is connected to the foot opening 37, and air is blown out from the foot outlet at the downstream end of the foot duct to the feet of the occupant. Yes.

  A plate-like blowing mode switching door 38 for switching the opening and closing of the face / diff passage 33 and the foot passage 36 is disposed on the vehicle front side of the air mixing unit 32. The rotation shaft 38a of the blow-out mode switching door 38 is disposed so as to extend in the direction perpendicular to the paper surface (vehicle width direction) in FIG. 3, and both end portions of the rotation shaft 38a are bearing holes (not shown) on the left and right side wall surfaces of the case 21. ) Is held rotatably. One end of the rotary shaft 38a protrudes outside the case 21 and is connected to a drive mechanism (not shown).

  In FIG. 1, the solid line position of the blowing mode switching door 38 indicates the position in the face / diff mode where the foot passage 36 is fully closed and the face / diff passage 33 is fully opened. On the other hand, the two-dot chain line position of the blowing mode switching door 38 indicates a foot mode position where the face / diff passage 33 is fully closed and the foot passage 36 is fully opened.

  The plate-like rear face door 39 that opens and closes the rear face opening 35 adjusts the air volume ratio between the air flow rate from the front face air outlet and the differential air outlet and the air volume rate from the rear face air outlet.

  The rotation shaft 39a of the rear face door 39 is arranged so as to extend in the direction perpendicular to the plane of the drawing (vehicle width direction) in FIG. 3, and both ends of the rotation shaft 39a are bearing holes (not shown) on the left and right side wall surfaces of the case 21. Is held rotatably. One end of the rotating shaft 39a protrudes outside the case 21 and is connected to a driving mechanism (not shown).

  In FIG. 1, the solid line position of the rear face door 39 indicates a position where the rear face opening 35 is fully opened. On the other hand, the two-dot chain line position of the rear face door 39 indicates a position where the rear face opening 35 is fully closed.

  In this example, an electric actuator (not shown) composed of a servo motor is used as a drive mechanism for rotationally driving the air mix door 27, the blow mode switching door 38 and the rear face door 39. Further, as a drive mechanism for each of the doors 27, 38, 39, a manual operation force of an operation member (for example, a manual operation lever) provided on an air conditioning operation panel (not shown) is applied via a cable, a link mechanism, or the like. You may use the manual operation mechanism which transmits to rotating shaft 27a, 38a, 39a.

  Although not shown, the air-conditioning operation panel is provided on an instrument panel disposed in a front portion of the vehicle interior space 15, and in addition to a compressor operation switch and an air volume switch of the refrigeration cycle, a temperature setting switch, a blowing mode It has a changeover switch, front / rear air volume adjustment switch, inside / outside air mode changeover switch, and the like.

  When the compressor operation switch on the air conditioning operation panel is turned on, the electromagnetic clutch of the compressor in the refrigeration cycle is energized and the electromagnetic clutch is in a connected state, so that the compressor is driven by the engine. Thereby, in the cooling heat exchanger 24, the low-temperature low-pressure refrigerant in the refrigeration cycle absorbs heat from the air and evaporates to cool the air.

  Then, the air mix door 27 is operated according to the set temperature set by the temperature setting switch, and the temperature of the conditioned air is adjusted.

  Further, the blow mode switching door 38 is operated in accordance with the setting of the blow mode switching switch, the blow mode is switched, and the rear face door 39 is operated in accordance with the setting of the front / rear air volume adjustment switch. The air volume ratio at the rear face outlet is adjusted. Further, the outside air door and the inside air door are operated according to the setting of the inside / outside air mode switching switch, and the inside / outside air mode is switched.

  Incidentally, a case-side opening 40 that opens toward the rear side of the vehicle is formed in the rear wall 21a of the case 21. The case side opening 40 is provided to inspect and clean the heat exchange core 24a of the cooling heat exchanger 24, and is formed in a rectangular shape in this example.

  In this example, since the cooling heat exchanger 24 is arranged substantially vertically, the heat exchange core portion 24 a of the cooling heat exchanger 24 faces the case side opening 40. More specifically, the air flow upstream portion of the heat exchange core portion 24 a of the cooling heat exchanger 24 faces the case side opening 40.

  The case side opening 40 can be opened and closed by a case side cover 41. Similar to the case 21, the case-side cover 41 is formed of a resin material having a certain degree of elasticity, such as polypropylene, and excellent in strength.

  The case side cover 41 is disposed on the outer side (rear side of the vehicle) of the case 21 with respect to the case side opening 40, and can be attached to and detached from the case 21 by fastening means (not shown) such as screws and clips. Yes. The case side opening 40 is opened and closed by attaching and detaching the case side cover 41.

  The area of the case side cover 41 is smaller than the opening area of the cabin side opening 42 that opens in the rear wall 12 of the cabin 10. The cabin side opening 42 opens toward the vehicle rear side and overlaps with the case side opening 40. In this example, the cabin side opening 42 is formed by cutting a vehicle outer plate (in this example, a steel plate) of the rear wall portion 12 into a rectangular shape.

  The cabin side opening 42 can be opened and closed by a cabin side cover 43. In this example, the cabin side cover 43 is formed of a steel plate in the same manner as the vehicle outer plate, but may be formed of a resin material or the like.

  The cabin-side cover 43 is disposed on the outer side (rear side) of the cabin 10 with respect to the cabin-side opening 42 and can be attached to and detached from the rear wall 12 of the cabin 10 by fastening means (not shown) such as screws and clips. It has become. The cabin side opening 42 is opened and closed by attaching and detaching the cabin side cover 43.

  Next, a procedure for inspecting and cleaning the heat exchange core portion 24a of the cooling heat exchanger 24 in the above configuration will be described. First, the cabin side cover 43 is removed from the rear wall 12 of the cabin 10 to the rear side of the cabin 10 to open the cabin side opening 42.

  Here, since the cabin side cover 43 is disposed on the outer side (rear side) of the cabin 10 with respect to the cabin side opening 42, the removal operation of the cabin side cover 43 is performed from the outer side (rear side) of the cabin 10. It can be carried out.

  Next, the case side cover 41 is removed from the case 21 to the case outer side (vehicle rear side) through the cabin side opening 42 to open the case side opening 40.

  Here, the case side opening 40 is overlapped with the cabin side opening 42, and the case side cover 41 is disposed on the outer side (vehicle rear side) of the case 21 with respect to the case side opening 40. The cabin side cover 43 can be removed from the cabin 10 opening side (rear side) through the cabin side opening 42.

  Furthermore, since the area of the case-side cover 41 is smaller than the opening area of the cabin-side opening 42, the removed case-side cover 41 can be taken out of the cabin 10 from the cabin-side opening 42.

  By opening the case side opening 40 and the cabin side opening 42 in this way, the heat exchange core 24a of the cooling heat exchanger 24 is exposed to the outside of the cabin 10, so that the cabin 10 outside (the rear side of the cabin 10) ) Through the cabin side opening 42 and the case side opening 40, the heat exchange core 24a of the cooling heat exchanger 24 can be inspected and cleaned.

  And after completion | finish of inspection and cleaning of the heat exchange core part 24a of the heat exchanger 24 for cooling, the case side cover 41 and the cabin side cover 43 are attached in the reverse procedure to the above-mentioned removal procedure.

  In a construction machine such as a hydraulic excavator, since it is used in a dusty environment such as sand dust, dust adheres to the fine fin gaps of the heat exchange core portion 24a of the heat exchanger 24 for cooling, and the core portion However, according to the present embodiment, the cooling heat exchanger 24 can be inspected and cleaned from the outside of the cabin 10 (the rear side of the cabin 10) while the cooling heat exchanger 24 is housed in the case 21.

  For this reason, it is not necessary to take out the cooling heat exchanger 24 from the case 21 of the air-conditioning unit 20 when inspecting and cleaning the cooling heat exchanger 24 as in the above-mentioned Patent Document 1, and cooling heat in the narrow cabin 10. There is no need to inspect and clean the exchanger 24. As a result, the cooling heat exchanger 24 can be easily inspected and cleaned in a short time.

  Furthermore, in this embodiment, since the upstream part of the air flow of the heat exchange core part 24a is directed to the case side opening 40 side and the cabin side opening 42 side, the heat exchange core part 24a to which dust is more likely to adhere is arranged. It is possible to easily check and clean the upstream portion of the air flow.

  Further, according to the present embodiment, as shown by an arrow a in FIG. 3, the air passing through the cooling heat exchanger 24 flows from the rear of the vehicle toward the front of the vehicle. On the other hand, as shown by the arrow d in FIG. 3, the air flowing through the foot opening 37 also flows from the rear of the vehicle toward the front of the vehicle.

  That is, the air flow direction in the foot opening 37 coincides with the air flow direction passing through the cooling heat exchanger 24. For this reason, it is easy to ensure the air volume of the air flowing through the foot opening 37, and as a result, it is easy to ensure the air volume of the air blown out from the foot outlet.

  Moreover, according to this embodiment, since the air outlet part 22e of the air blower part 22 can be arrange | positioned in the rearmost part of the air conditioning unit 20, as FIG.2 (a) shows, the air outlet part 22e of the air blower part 22 is kept away from a passenger | crew. be able to. For this reason, the ventilation noise which reaches a passenger | crew's ear can be reduced.

  Moreover, according to this embodiment, since the substantially rectangular cooling heat exchanger 24 is disposed substantially vertically inside the case 21, the size of the air conditioning unit 20 in the vehicle front-rear direction can be reduced. As a result, in the vehicle interior space 15, a space that can be used by the passenger can be expanded.

  As a reference example, the air conditioning unit 20 may be configured symmetrically with respect to the present embodiment, and the case side opening 40 may be opened toward the seat 18 side (vehicle front side). As another reference example, the case side opening 40 may be formed in the upper surface portion of the case 21, more specifically, in a portion of the upper surface portion of the case 21 positioned above the inflow space 25.

  In these reference examples, it is not possible to inspect and clean the cabin 10 from the outside (rear side), and it is necessary to inspect and clean the cooling heat exchanger 24 in the cabin 10. 42 and the cabin side cover 43 can be abolished.

(Second Embodiment)
In the first embodiment, the case side opening 41 is opened / closed by attaching / detaching the case side cover 41 to / from the case 21, and the cabin side opening 42 is attached / detached by attaching the cabin side cover 43 to the rear wall 12 of the cabin 10. However, in the second embodiment, as shown in FIG. 4, both covers 41, 43 are orthogonal to the opening direction of both openings 40, 42 (the vehicle longitudinal direction in this example). Both openings 40 and 42 are opened and closed by swinging in the direction.

  More specifically, the upper edge portion of the case side cover 41 is fixed to the case 21 via a hinge mechanism (not shown), and the upper wall portion of the cabin side cover 43 is fixed to the rear wall portion of the cabin 10 via a hinge mechanism (not shown). 12 is fixed. Thereby, since both the covers 41 and 43 are hold | maintained so that rock | fluctuation to an up-down direction, both the opening parts 40 and 42 can be opened and closed easily by both the covers 41 and 43. FIG.

  Further, when the case side cover 41 is swung in a direction in which the case side opening 40 is opened, the case side cover 41 protrudes to the outside of the cabin 10 through the cabin side opening 42. Thereby, the case side opening part 40 can be opened entirely.

  In this example, the hinge mechanism is arranged at the upper edge of both covers 41, 43, but the hinge mechanism may be arranged at the lower edge of both covers 41, 43. Moreover, a hinge mechanism may be arrange | positioned at the right-and-left edge part of both covers 41 and 43, and you may hold | maintain both covers 41 and 43 so that rocking | swiveling in the left-right direction is possible.

(Third embodiment)
In the second embodiment, both the openings 40 and 42 are opened and closed by swinging both the covers 41 and 43. In the third embodiment, as shown in FIG. Both openings 40 and 42 are opened and closed by translating (sliding) 41 and 43 in a direction orthogonal to the opening direction of both openings 40 and 42 (the vehicle longitudinal direction in this example).

  More specifically, the left and right edges of the case side cover 41 are fixed to the case 21 via a slide mechanism (not shown), and the left and right edges of the cabin side cover 43 are fixed to the rear wall of the cabin 10 via a slide mechanism (not shown). 12 is fixed.

  Thereby, both the covers 41 and 43 are held so as to be slidable in the vertical direction. Here, since the lower portion of the rear wall portion 12 of the cabin 10 extends in the vertical direction, the case-side cover 41 can move in parallel in the vehicle interior space 15 without interfering with the rear wall portion 12.

  Thus, both the openings 40 and 42 can be opened and closed by sliding the covers 41 and 43 in the vertical direction.

  In this example, both covers 41 and 43 are held so as to be slidable in the vertical direction, but may be held so as to be slidable in the horizontal direction.

(Other embodiments)
In each of the above embodiments, the air conditioning unit 20 is mounted at the rearmost and lowermost part of the vehicle interior space 15, but the mounting position of the air conditioning unit 20 is not limited to this. For example, the air conditioning unit 20 may be mounted at the center and lowermost portion of the vehicle interior space 15, that is, below the seat 18.

  In this case, the air conditioning unit 20 is mounted in a direction rotated 90 degrees horizontally with respect to each of the above-described embodiments, and the heat exchange core portion 24a of the cooling heat exchanger 24 faces the side wall portion side of the cabin 10. In this manner, the cabin side opening 42 and the cabin side cover 43 may be disposed on the side wall portion of the cabin 10.

  In each of the above embodiments, the heat exchanger 24 for cooling and the heat exchanger 26 for heating are provided as heat exchangers for exchanging heat with air. However, the heat exchanger 24 for cooling is abolished by eliminating the heat exchanger 24 for cooling. Only the exchanger 26 may be included.

  In this case, what is necessary is just to arrange | position the heat exchange core part 24a of the heat exchanger 26 for heating facing the case side opening part 40. FIG. Thereby, inspection and cleaning of the heat exchanger 26 for heating can be performed easily and in a short time.

  Moreover, in each said embodiment, although the air flow upstream part of the heat exchange core part 24a of the heat exchanger 24 for cooling is made to oppose the case side opening part 40, the air flow downstream part of the heat exchange core part 24a May be made to face the case side opening 40.

  In the above embodiments, the vehicle air conditioner according to the present invention is applied to a construction machine such as a hydraulic excavator. However, the application target of the present invention is not limited to a construction machine such as a hydraulic excavator. In addition, the present invention can be applied to other various vehicles. For example, it can be applied to tractors for agricultural machinery.

1 is a schematic cross-sectional view of a cabin of a hydraulic excavator according to a first embodiment of the present invention. It is a two-plane figure of the air-conditioning unit part in FIG. It is AA sectional drawing in FIG. It is typical sectional drawing of the principal part of the cabin of the hydraulic shovel by 2nd Embodiment of this invention. It is a typical principal part sectional view of the cabin of the excavator by a 3rd embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Cabin, 12 ... Rear wall part (peripheral wall part), 15 ... Car interior space, 21 ... Case,
24 ... Cooling heat exchanger (heat exchanger), 24a ... Heat exchange core, 40 ... Case side opening,
41 ... case side cover, 42 ... cabin side opening, 41 ... cabin side cover.

Claims (6)

A case (21) which is disposed in a vehicle interior space (15) formed in the cabin (10) and forms an air passage through which air flows;
A heat exchanger (24) housed in the case (21) and exchanging heat with air;
The case (21) is disposed adjacent to the peripheral wall (12) of the cabin (10);
A portion of the case (21) adjacent to the peripheral wall portion (12) is formed with a case side opening (40) that is opened and closed by a case side cover (41).
The case side opening (40) is superposed on the cabin side opening (42) opened to the peripheral wall (12) and opened and closed by a cabin side cover (43),
The vehicle air conditioner, wherein a heat exchange core portion (24a) of the heat exchanger (24) is disposed to face the case side opening (40). 2. The vehicle air conditioner according to claim 1, wherein an air flow upstream side portion of the heat exchange core portion (24 a) faces the case side opening (40). 3. The peripheral wall portion is a rear wall portion (12) of the cabin (10),
The case (21) is arranged on the rear side in the cabin (10);
The air conditioner for vehicles according to claim 1 or 2, wherein said heat exchanger (24) is stored in the back side in said case (21). The area of the case side cover (41) is smaller than the area of the cabin side opening (42),
The case side cover (41) is detachably fixed to the case (21),
The vehicle air conditioner according to any one of claims 1 to 3, wherein the case side opening (40) is opened and closed by attaching and detaching the case side cover (41). . The area of the case side cover (41) is smaller than the area of the cabin side opening (42),
The case side cover (41) is supported so as to be swingable with respect to the case (21) in a direction orthogonal to the opening direction of the case side opening (40),
The case side opening (40) is opened and closed by swinging the case side cover (41),
Further, when the case-side cover (41) is swung in a direction to open the case-side opening (40), the case-side cover (41) passes through the cabin-side opening (42) and the cabin (10). The vehicle air conditioner according to any one of claims 1 to 3, wherein the vehicle air conditioner protrudes to the outside of the vehicle. The case-side cover (41) is supported so as to be parallel to the case (21) in a direction perpendicular to the opening direction of the case-side opening (40),
The case side opening (40) is opened and closed by the parallel movement of the case side cover (41),
The vehicle air conditioner according to any one of claims 1 to 3, wherein the case side cover (41) is adapted to move in parallel in the vehicle interior space (15).

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