JP2020015462A - Cab for construction machine - Google Patents

Abstract

To provide a cab having an air-conditioner that is able to achieve both supply of cooling air to the vicinity of the head of a worker seated in a driver seat in a cab and supply of cooling air for effectively shielding the vicinity of a ceiling against heat.SOLUTION: In a cab 7 for a construction machine, a duct 50A has a head outlet 51 and a ceiling outlet 52 located higher than the head outlet 51. The duct 50A is configured such that some of the cooling air guided by the duct 50A is blown out of one of the head outlet 51 and the ceiling outlet 52 and at least some of the cooling air guided by the duct 50A after passing through this one outlet is blown out of the other of the head outlet 51 and the ceiling outlet 52.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a cab of a construction machine provided with an air conditioner.

  In a cab of a construction machine, an operator sitting in a driver's seat may feel uncomfortable because heat due to solar radiation is transmitted to the cab space of the cab through a cab ceiling or the like. For this purpose, the cab is equipped with an air conditioner. For example, the air conditioner described in Patent Literature 1 has a left outlet provided on a left rear pillar located behind the driver's seat and a right outlet provided on a right rear pillar located right behind the driver's seat. And a ceiling outlet provided on a rear cover located behind the driver's seat. Patent Literature 1 discloses that a rear window and a ceiling window are covered with an air curtain formed by cold air blown from a ceiling outlet, and that a left window and a right window are air curtain formed by cold air blown from a left outlet and a right outlet. Is covered.

JP 2010-195196 A

  By the way, in the air conditioner described in paragraph 0021 of FIG. 2 and FIG. 2, the left outlet and the right outlet are located at a height where air can be blown to the left window portion and the right window portion facing the headrest. The ceiling outlet is provided below the left outlet and the right outlet. In such an arrangement, the distance between the ceiling outlet and the ceiling becomes large, so that the cooling air blown out from the ceiling outlet is easily diffused to the surroundings before reaching the ceiling, so that the heat from the solar radiation can be reduced near the ceiling. In this case, the effect of shielding heat is not always sufficiently obtained.

  The present invention has been made to solve the above-described problems, and is intended to effectively supply cooling air to the vicinity of the head of an operator sitting on the driver's seat of the cab and effectively shield heat near the ceiling. It is an object of the present invention to provide a cab provided with an air conditioner capable of achieving both supply of cooling air.

  Provided by the present invention is a cab of a construction machine, comprising a driver's seat, an air conditioner main body having a function of cooling air, and an air conditioner provided behind the driver's seat and extending vertically. A duct for guiding the cooling air generated in the main body. The duct is a head outlet for blowing out the cooling air toward a height position corresponding to an upper part of the driver's seat, and is located above the head outlet, and is provided on a ceiling of the cab. And a ceiling outlet for blowing the cooling air toward the ceiling. In the duct, a part of the cooling air guided by the duct is blown out from one of the head outlet and the ceiling outlet, and passes through the one outlet. At least a part of the cooling air guided by the duct is blown out from the other of the head outlet and the ceiling outlet.

  In this cab, the head air outlet and the ceiling air outlet are provided in the same duct, and one of the air outlets provided upstream of the flow of the cooling air from one of the air outlets. The part is blown out, and part or all of the remaining cooling air that has passed through the one outlet without being blown out from the one outlet is blown out from the other outlet. Specifically, the cooling air guided by the duct is blown out from the head outlet, so that the cooling air is supplied to the vicinity of the head of an operator sitting on the driver's seat of the cab. The cooling air guided by the duct is blown out from a ceiling outlet located above the head outlet, that is, from a ceiling outlet closer to the ceiling than the head outlet. Thereby, the cooling air is efficiently supplied to the vicinity of the ceiling, and the heat shielding near the ceiling is effectively performed. Furthermore, in the cab of the present invention, the head outlet and the ceiling outlet are provided in the same duct extending in the vertical direction, so that the ceiling outlet is provided separately from the duct in which the head outlet is provided. There is no need to install a dedicated duct for the exit. Therefore, in the present invention, the supply of the cooling air to the vicinity of the head of the worker sitting in the driver's seat of the cab and the supply of the cooling air for effectively performing the heat shielding near the ceiling are performed by a simple structure. Can be compatible.

  In the cab of the construction machine, the ceiling outlet is located downstream of the flow of the cooling air in the duct with respect to the head outlet, and the head outlet and the An intermediate portion between the outlet for the ceiling and the outlet for the ceiling includes a small channel portion, and the cross-sectional area of the channel of the small channel portion is the flow rate of the portion of the duct where the outlet for the head is provided. Preferably, it is smaller than the cross-sectional area of the road. In this aspect, the small flow path portion provided in the intermediate portion has a flow velocity of the cooling air blown out from the ceiling outlet compared with a case where the small flow portion is not provided in the intermediate portion. It is possible to increase. In addition, the small flow path portion increases the resistance when the cooling air passes through the small flow path portion as compared with a case where the small flow path portion is not provided in the intermediate portion. Most of the cooling air guided by is prevented from being blown out from the ceiling outlet downstream of the small flow passage portion, and is blown out from the head outlet upstream of the small flow passage portion. It is possible to secure the air volume of the cooling air.

  In the cab of the construction machine, it is preferable that the small flow passage portion includes a flow passage gradually decreasing portion in which a cross-sectional area of the flow passage gradually decreases as approaching the ceiling outlet. The flow passage gradual decreasing portion in which the cross-sectional area of the flow path is continuously reduced enables the cooling air to flow smoothly toward the ceiling outlet as compared with the case where the cross-sectional area of the flow path changes suddenly. Therefore, this aspect suppresses an increase in pressure loss as compared with a case where the cross-sectional area of the flow path changes suddenly.

  For example, in a case where a portion where the cross-sectional area of the flow path suddenly changes as described above is further formed downstream of the flow path gradually decreasing portion in the intermediate part, stagnation of the air flow occurs in the sudden change part. Therefore, there is a possibility that the effect of increasing the flow velocity of the cooling air by the small flow path portion is reduced due to the stagnation.

  Therefore, in the cab of the construction machine, of the intermediate portion, at least a downstream portion from a central portion between the head outlet and the ceiling outlet to the ceiling outlet is gradually reduced in the flow path. It is preferably constituted by a part. In this aspect, since the flow passage gradual decreasing portion constituting the downstream portion is adjacent to the ceiling outlet, the cooling air guided by the flow passage gradual decreasing portion and having an increased flow velocity is supplied to the ceiling outlet. It is blown out smoothly from. This suppresses a decrease in the effect of increasing the flow rate of the cooling air by the small flow path portion.

  In the case where the small flow path portion as described above is provided, the opening area of the ceiling outlet may be smaller than the opening area of the head outlet. In this aspect, as compared with the case where the opening area of the ceiling outlet is the same as the opening area of the head outlet, the flow velocity of the cooling air is not only increased by the small flow path portion, It can also be increased by making the opening area of the air outlet for the head smaller than the opening area of the air outlet for the head.

  In the cab of the construction machine, the ceiling outlet is preferably provided at a downstream end of the duct. In this aspect, since the cooling air is not distributed downstream of the ceiling outlet in the duct, the flow velocity of the cooling air blown out from the ceiling outlet is more effectively increased.

  It is preferable that the cab of the construction machine further includes an opening / closing member for opening and closing the head outlet. In this aspect, the outlet for the head and the outlet for the ceiling are provided in the same duct, and the opening and closing member is provided. A state in which air is blown directly to the worker's head and cooling air is blown toward the ceiling, and a state in which cooling air is prevented from being blown directly to the worker's head and cooling air is blown toward the ceiling State can be switched.

  In the cab of the construction machine, the ceiling outlet is located on the downstream side of the flow of the cooling air in the duct with respect to the head outlet, and the opening area of the ceiling outlet is It may be smaller than the opening area of the head outlet. In this aspect, compared with the case where the opening area of the ceiling outlet is the same as the opening area of the head outlet, the flow velocity of the cooling air blown out from the ceiling outlet can be increased, and Since the resistance when the cooling air passes through the ceiling outlet increases, most of the cooling air guided by the duct is prevented from being blown out from the ceiling outlet, and from the ceiling outlet. Also, the air volume of the cooling air blown out from the upstream head outlet is ensured.

  As described above, according to the present invention, while suppressing the structure of the air conditioner from becoming complicated, supply of cooling air to the vicinity of the head of an operator sitting on the driver's seat of the cab, and supply of cooling air near the ceiling Supply of cooling air for effectively performing heat shielding can be achieved.

1 is an overall side view of a hydraulic shovel as a construction machine on which a cab according to an embodiment of the present invention is mounted. It is a perspective view showing the outline of the cab concerning an embodiment. FIG. 2 is a schematic front view for explaining a positional relationship among a driver's seat, left and right control boxes, and a plurality of air outlets of the air conditioner in the cab according to the embodiment. It is a perspective view showing an outline of an air conditioner in a cab concerning an embodiment. It is a perspective view showing the duct structure of the air conditioner in the cab concerning an embodiment. FIG. 6 is a front view when the air conditioner body is viewed in a direction of an arrow VI in FIG. 5. FIG. 6 is a plan view when the air conditioner main body is viewed in a direction of an arrow VII in FIG. 5. It is a bottom view showing a central duct of an air conditioner in a cab concerning an embodiment. It is a front view which shows the center duct of the air conditioner in the cab which concerns on embodiment. It is a schematic left side view for explaining the positional relationship of the driver's seat and the left rear duct and the right rear duct in the cab according to the embodiment. It is a schematic plan view for explaining the positional relationship of the driver's seat, the left and right control boxes, and the left and right thigh outlets of the air conditioner in the cab according to the embodiment. It is a right view which shows the left rear duct of the air conditioner in the cab which concerns on embodiment. It is a left view which shows the right rear duct of the air conditioner in the cab which concerns on embodiment. FIG. 5 is a right side view when the upper portion of the left rear cover in FIG. 4 is viewed in the direction of arrow XIV. It is a right view which shows the modification of the left rear duct of the air conditioner in the cab which concerns on embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Overall structure of construction machinery]
FIG. 1 shows a hydraulic shovel as an example of a construction machine on which a cab according to the present invention is mounted. The hydraulic excavator includes a crawler-type lower traveling body 1, an upper revolving body 2 rotatably mounted thereon, and a working device 6 mounted on the upper revolving body 2. The upper swing body 2 has a swing frame 2a connected to the lower traveling structure 1, and a cab 7 mounted on the swing frame 2a. The working device 6 is connected to the front end of the revolving frame 2a (the front right end in the example shown in FIG. 1) so as to be able to undulate, and is rotatably connected to the front end of the boom 3. The vehicle includes an arm 4 and a bucket 5 rotatably connected to a distal end of the arm 4.

  The cab 7 is mounted on a front portion of the turning frame 2a and adjacent to the boom 3 in the width direction of the turning frame 2a (a front left portion in the example shown in FIG. 1). A driver's cab for steering is configured. That is, in the cab 7, operations for causing the traveling of the lower traveling body 1, the turning of the upper rotating body 2, and the work operation of the working device 3 are performed.

[Cab structure]
As shown in FIG. 2, the cab 7 includes a floor plate 10, a cab outer wall 12, a seat stand 14, an intermediate plate 16, a driver's seat 18, left and right traveling pedals 8, 8, and left and right control boxes. 20A and 20B, left and right armrests 27A and 27B, and an air conditioner 30.

  The floor plate 10 is a horizontal plate constituting the floor of the cab 7, and the cab outer wall 12 defines a cab space above the floor plate 10. The seat stand 14 is fixed on the upper surface of the floor plate 10. The intermediate plate 16 is disposed on the seat stand 14 via a pair of left and right first slide rails 15 (see FIGS. 2 and 3) so as to be slidable with respect to the seat stand 14 in the front-rear direction.

  The driver's seat 18 is a seat on which an operator sits. The driver's seat 18 is disposed substantially at the center of the cab 7 in plan view. A window is provided on at least a front side of the cab outer wall 12, and a front view of an operator sitting on the driver's seat 18 is secured through the window. The driver's seat 18 has a seat 18A, a backrest 18B, and a headrest 18C. The seat 18A is a portion where the buttocks of the worker are placed. The backrest 18B is attached to the rear end of the seat 18A and is a part that rises upward and has a function of supporting the torso of the worker. The headrest 18C is a pillow-shaped member attached to the upper end of the backrest 18B, and has a function of supporting the head of the worker. The headrest 18C forms an upper part of the driver's seat 18.

  The left and right traveling pedals 8, 8 are pedals that cause the lower traveling body 1 to travel. The traveling pedals 8 are provided on a floor plate 10. An operator sitting on the driver's seat 18 can run the lower traveling body 1 by depressing the left and right traveling pedals 8 located in front of the driver's seat 18.

  The left and right control boxes 20A and 20B are disposed on the left and right sides of the driver's seat 18, respectively. Each of the left and right control boxes 20A and 20B has an operation lever 22 and a box body 24.

  The operation lever 22 rotates back and forth and right and left in response to an operation by an operator sitting on the driver's seat 18. The operation is an operation for turning the upper turning body 2 or an operation for operating the work device 6.

  The box main body 24 is disposed so as to extend in the front-rear direction on the side of the driver's seat 18. The box main body 24 has a metal frame 25, a cover 26 formed of a resin material, and a plurality of switches 21. The frame 25 supports the operation lever 22 and a pilot valve (not shown) that opens and closes according to the operation of the operation lever 22. The cover 26 is mounted on the frame 25 so as to cover the frame 25, the pilot valve, unillustrated hydraulic piping, electric wiring, and the like. The operation lever 22 is attached to the frame 25 so as to penetrate the cover 26 at the front of the box body 24 and protrude upward from the upper surface 20S of the cover 26 (the respective upper surfaces 20S of the control boxes 20A and 20B). Supported.

  The plurality of switches 21 are provided on respective upper surfaces 20S of the control boxes 20A and 20B. Specifically, the plurality of switches 21 are supported by the frame 25 so as to be exposed upward from the upper surface of the cover 26. The plurality of switches 21 are provided behind the operation lever 22 (specifically, directly behind the operation lever 22).

  As shown in FIGS. 2 and 3, the left and right control boxes 20A and 20B are fixed to left and right ends of the intermediate plate 16 so as to slide integrally with the intermediate plate 16, respectively. It is arranged on the intermediate plate 16 via a pair of left and right second slide rails 17 so as to be slidable in the front-rear direction with respect to the intermediate plate 16. Therefore, the slid operation of the first and second slide rails 15 and 17 causes the cab body including the floor plate 10 and the cab outer wall 12, the driver's seat 18, the left and right control boxes 20A and 20B and the right and left. Relative to the armrests 27A and 27B in the front-rear direction can be adjusted. Specifically, the relative positions of the driver's seat 18, the left and right control boxes 20A and 20B, and the left and right armrests 27A and 27B with respect to the cab body are adjusted by sliding the intermediate plate 16 with respect to the seat stand 14 in the front and rear direction. The relative position of the driver's seat 18 with respect to the left and right control boxes 20A, 20B and the left and right armrests 27A, 27B can be adjusted by sliding the driver's seat 18 with respect to the intermediate plate 16.

  The left and right armrests 27A and 27B are disposed on the left and right sides of the driver's seat 18, respectively. The left and right armrests 27A, 27B support the left and right arms of the worker. As shown in FIG. 3, each of the left and right armrests 27 </ b> A and 27 </ b> B has an armrest main body 28 and a support member 29. The armrest main body 28 is provided to support the forearm of the operator when the operator sitting on the driver's seat 18 operates the operation lever 22, so that the armrest main body 28 is directly above the left and right control boxes 20A and 20B. And has a shape extending in the front-rear direction so that the forearm of the worker can be supported.

  The support member 29 is a member for supporting the armrest main body 28. In the present embodiment, the support member 29 is connected to the rear end of the armrest main body 28, and supports the armrest main body 28 so as to be rotatable around the rear end. One end (lower end) of the support member 29 is attached to the frame 25, and the other end (upper end) of the support member 29 is attached to the armrest main body 28. Thus, the armrest main body 28 is supported by the frame 25 via the support member 29. Therefore, as described above, when the intermediate plate 16 slides in the front-rear direction with respect to the seat stand 14, the left and right armrests 27A, 27B move in the front-rear direction integrally with the left and right control boxes 20A, 20B. Further, the support member 29 has a height adjustment mechanism for adjusting the height of the armrest main body 28.

  Since the valve such as the pilot valve is a member whose temperature easily rises during the operation of the construction machine, the temperature of the control boxes 20A and 20B having the valve such as the pilot valve also easily rises. An operator sitting in the driver's seat 18 located between the left and right control boxes 20A and 20B may feel uncomfortable (feel hot) especially under the thighs due to the influence of the heat of the control boxes 20A and 20B. . Therefore, the cab 7 according to the present embodiment includes the following air conditioner 30. The air-conditioning apparatus 30 controls supply of cooling air to the vicinity of the thighs of the worker sitting on the driver's seat 18 of the cab 7, supply of cooling air to the vicinity of the head of the worker, and heat shielding near the ceiling. Cooling air can be supplied for effective operation.

[Structure of air conditioner]
The air conditioner 30 is for air conditioning the cab space of the cab 7. FIG. 4 is a perspective view illustrating an outline of the air conditioner 30 in the cab 7 according to the present embodiment, and FIG. 5 is a perspective view illustrating a duct structure of the air conditioner 30 in the cab 7 according to the present embodiment. . As shown in FIGS. 4 and 5, the air conditioner 30 includes an air conditioner main body 31, a plurality of ducts 40, 50A, 50B, 60, and a plurality of covers 70, 80A, 80B, 90 covering these ducts. And.

  The air conditioner main body 31 only needs to have at least a cooling function of cooling air in the cab space, and a specific configuration is not particularly limited. The air conditioner main body 31 may further include a heating function, a dehumidifying function, and the like. In the present embodiment, the air conditioner main body 31 is disposed on the floor plate 10 behind the driver's seat 18.

  As shown in FIGS. 6 and 7, the air conditioner main body 31 includes a casing 36, a fan 33, a compressor (not shown), and the like. The casing 36 has an air inlet 32 and air outlets 34 and 35. When the fan 33 rotates, the air in the cab space is sucked into the casing 36 from the air inlet 32 and cooled, and then blown out from the air outlets 34 and 35.

  In the present embodiment, the air conditioner body 31 has a substantially rectangular parallelepiped shape in which the dimension in the left-right direction is larger than the dimension in the front-rear direction. The air suction port 32 and the fan 33 are arranged at one of the left and right sides of the air conditioner main body 31 (the left side in the specific examples of FIGS. 6 and 7). The air conditioner main body 31 is disposed at a position biased to the other side in the left-right direction (the right side in the specific examples of FIGS. 6 and 7). As shown in FIG. 7, the air outlet 34 is provided on the upper surface of the casing 36, and has a substantially rectangular shape in which the dimension in the left-right direction is larger than the dimension in the front-rear direction. The air outlet 35 is provided on a side surface (a right side surface in the specific examples of FIGS. 6 and 7) of the casing 36.

  As shown in FIG. 5, the plurality of ducts include a central duct 40, a pair of rear ducts 50A and 50B (left rear duct 50A and right rear duct 50B), and front duct 60. The center duct 40, the left rear duct 50A, and the right rear duct 50B are arranged behind the driver's seat 18. Specifically, the center duct 40 is disposed immediately behind the driver's seat 18, the left rear duct 50 </ b> A is disposed on the left rear of the driver's seat 18, and the right rear duct 50 </ b> B is disposed on the right rear of the driver's seat 18. ing. The front duct 60 extends in the front-rear direction on the side of the driver's seat 18 (on the right side in the specific example of FIG. 5) from a position behind the driver's seat 18 to a position in front of the driver's seat 18.

[Central duct]
As shown in FIGS. 5, 6 and 8, the central duct 40 receives the cooling air blown from the air outlet 34 provided on the upper surface of the air conditioner main body 31 and distributes the cooling air to the right and left. I will guide you to each. In the present embodiment, the central duct 40 is interposed between the air outlet 34 of the air conditioner main body 31 and the left rear duct 50A and the right rear duct 50B, and supplies the cooling air blown out from the air outlet 34 to the left. It is distributed to each of the rear duct 50A and the right rear duct 50B.

  The central duct 40 has a shape extending in the left-right direction (a shape elongated in the left-right direction). The center duct 40 includes a left outlet 41 (left outlet 41 for the thigh), a right outlet 42 (right outlet 42 for the thigh), a left connecting port 43, a right connecting port 44, and a connecting port 45 (air Inlet).

  In the left-right direction, the connection port 45 is provided between the left outlet 41 and the right outlet 42. In the left-right direction, the connection port 45 is provided between the left connection port 43 and the right connection port 44.

  The connection port 45 is connected to the air outlet 34. As shown in FIG. 8, the connection port 45 has a shape corresponding to the air outlet 34 of the air conditioner main body 31, that is, a substantially rectangular shape whose dimension in the left-right direction is larger than that in the front-rear direction. The cooling air blown out from the air outlet 34 flows into the central duct 40 through the connection port 45.

  As shown in FIG. 9, in the present embodiment, the center position C1 in the left-right direction of the connection port 45, that is, the center position C1 between the left end 45 </ b> A and the right end 45 </ b> B of the connection port 45 is the position of the left outlet 41. It is located on one side in the left-right direction (right side in the specific example shown in FIG. 9) with respect to the center position C2 in the left-right direction between the center and the center of the right outlet 42. That is, the center position C1 of the connection port 45 is located closer to the right outlet 42 than to the left outlet 41. When the connection ports 45 are unevenly distributed in the left-right direction as described above, the amount of air blown from the right outlet 42 is larger than the amount of air blown from the left outlet 41. As shown in FIG. 7, in the present embodiment, in the air conditioner main body 31, the fan 33 is located at a position biased to the other in the left and right direction (left side in the specific example shown in FIG. 7) with respect to the air outlet 34. Are located. In such a case, the air sent to the air outlet 34 by the fan 33 tends to be biased to one side (the right side in the specific example shown in FIG. 7) of the air outlet 34 in the left-right direction.

  In the present embodiment, as shown in FIG. 9, the central duct 40 includes a minimum flow path portion 46 for suppressing the above-described deviation of the left and right airflow. In the left-right direction, the minimum flow path portion 46 is provided at a portion of the center duct 40 that is shifted to one side (right side in the specific example shown in FIG. 9) in the left-right direction from the center position C1 of the connection port 45. ing. Specifically, in the left-right direction, the minimum flow path portion 46 is located at the center position C1 of the connection port 45 and the inner end of one of the outlets (in the specific example shown in FIG. It is provided at a portion between the outlet 42 and the left end 42E).

  The minimum flow path portion 46 is a cross-sectional area of the flow path in a portion between the right end 41E (inside end) of the left outlet 41 and the left end 42E (inside end) of the right outlet 42 in the central duct 40. Is the smallest part. In addition, when comparing the cross-sectional area of the flow path in the portion between the right end 41E and the left end 42E, the cross-sectional area of the flow path is obtained by cutting the central duct 40 along a plane orthogonal to the left-right direction. This is the area (area of the flow passage) of a portion inside the inner side surface of the central duct 40 in the cross section.

  The left outlet 41 and the right outlet 42 are air outlets for supplying cooling air to the vicinity of the thighs of the operator seated in the driver's seat 18 and supplying cooling air to the vicinity of the inner surfaces of the control boxes 20A and 20B. is there. The left outlet 41 and the right outlet 42 are open forward so that the cooling air can be blown forward. The left outlet 41 and the right outlet 42 are arranged at a height position and a left / right position where cooling air can be supplied to the vicinity of the thighs of the worker sitting on the driver's seat 18. In the present embodiment, the left outlet 41 and the right outlet 42 are provided at the left end and the right end of the central duct 40.

  As shown in FIGS. 5 and 8, the left connection port 43 and the right connection port 44 distribute the cooling air guided by the central duct 40 to the left rear duct 50A and the right rear duct 50B. The left connection port 43 and the right connection port 44 open rearward or obliquely rearward. The left connection port 43 is connected to the connection port 55 of the upstream end 50U (lower end 50U) of the left rear duct 50A. The right connection port 44 is connected to a connection port 55 of the upstream end 50U (lower end 50U) of the right rear duct 50B. The left connection port 43 is provided at the left end of the central duct 40, and the right connection port 44 is provided at the right end of the central duct 40. Since the central duct 40 includes the minimum flow path portion 46 as described above, the bias of the left and right air volumes of the cooling air guided by the central duct 40 and distributed to the left rear duct 50A and the right rear duct 50B is suppressed. .

[Left rear duct and right rear duct]
As shown in FIG. 5, each of the left rear duct 50A and the right rear duct 50B guides the cooling air generated in the air conditioner main body 31 upward. The details of the configuration of the left rear duct 50A and the right rear duct 50B are slightly different from each other in terms of irregularities and curved shapes in order to avoid interference with other members constituting the cab 7, but are described below. The basic configuration relating to the features of the embodiment is common.

  Each of the left rear duct 50A and the right rear duct 50B has a shape extending vertically (a shape elongated vertically). Each of the left rear duct 50A and the right rear duct 50B has a head outlet 51 and a ceiling outlet 52. As shown in FIGS. 3 and 10, the head outlet 51 is for blowing the cooling air F1 toward a height position corresponding to the headrest 18C. The ceiling outlet 52 is for blowing the cooling air F2 toward the ceiling 7A of the cab 7.

  In the present embodiment, in each of the left rear duct 50A and the right rear duct 50B, the vertical center position of the head outlet 51 is higher than the vertical center position of the headrest 18C. As shown in FIGS. 3 and 10, the cooling air F <b> 1 is blown obliquely downward and inward in the left-right direction from the head outlet 51. The direction in which the cooling air F1 is blown out can be changed by, for example, a known wind direction adjusting member (not shown) provided in the opening 81 for the head of the duct covers 80A and 80B described later.

  The ceiling outlet 52 is located downstream of the flow of the cooling air in the duct with respect to the head outlet 51. The ceiling outlet 52 is provided at a downstream end 50D of the duct. The ceiling outlet 52 is arranged above the head outlet 51 at an interval above. Accordingly, each of the left rear duct 50A and the right rear duct 50B has an intermediate portion 57 between the head outlet 51 and the ceiling outlet 52. As shown in FIGS. 12 and 13, the intermediate portion 57 has a height corresponding to the upper end 51U of the head outlet 51 and a lower end 52D of the ceiling outlet 52 in the rear duct. It is the part between the position.

  The intermediate portion 57 includes a small channel portion 53. The cross-sectional area of the flow passage of the small flow passage portion 53 is smaller than the cross-sectional area of the flow passage of the portion 56 (large flow passage portion 56) of the rear duct where the head outlet 51 is provided. The large channel portion 56 is a portion of the rear duct between a height position corresponding to the lower end 51D of the head outlet 51 and a height position corresponding to the upper end 51U of the head outlet 51. is there. In the present embodiment, the cross-sectional area of the flow path of the large flow path 56 is substantially constant from the lower end to the upper end of the large flow path 56, but is not limited thereto. May fluctuate between them.

  When comparing the cross-sectional areas of the flow passages of the small flow passage portion 53 and the large flow passage portion 56, the cross-sectional area of the flow passage is the rear duct in a cross section when the rear duct is cut along a plane perpendicular to the vertical direction. Is the area (area of the flow path) of the portion inside the inner side surface of the.

  In the present embodiment, the small flow path portion 53 includes a flow path gradually decreasing portion 54 in which the cross-sectional area of the flow path gradually decreases as approaching the ceiling outlet 52. In the present embodiment, of the intermediate portion 57, at least a downstream portion from the central portion 57 </ b> C between the head outlet 51 and the ceiling outlet 52 to the ceiling outlet 52 is the flow path gradually decreasing portion 54. It is constituted by. The downstream portion is a portion of the rear duct between a height position corresponding to the center position 57C and a height position corresponding to the lower end 52D of the ceiling outlet 52. In addition, the whole of the intermediate portion 57 may be constituted by the flow path gradually decreasing portion 54. In the present embodiment, the flow path gradual decreasing portion 54 has a shape such that the flow path of the cooling air is narrowed as approaching the ceiling outlet 52.

  As shown in FIGS. 5, 12 and 13, the opening area of the ceiling outlet 52 is smaller than the opening area of the head outlet 51. In the present embodiment, the head outlet 51 is constituted by a single opening, and the ceiling outlet 52 is constituted by a single opening, but is not limited to this. The head outlet 51 may be constituted by a plurality of openings, and the ceiling outlet 52 may be constituted by a plurality of openings. When the head outlet 51 is constituted by a plurality of openings, the opening area of the head outlet 51 is the sum of the opening areas of the plurality of openings. When the ceiling outlet 52 is constituted by a plurality of openings, the opening area of the ceiling outlet 52 is the sum of the opening areas of the plurality of openings.

  As shown in FIG. 3, the air conditioner 30 includes an opening / closing member 83 for opening and closing the head outlet 51. The opening / closing member 83 is provided on duct covers 80A and 80B described later. The opening / closing member 83 includes, for example, a frame, and one or more plate-like members that open and close one or more openings formed inside the frame. The plate member is slidably or rotatably attached to the frame.

[Front duct]
As shown in FIG. 5, the front duct 60 extends in the front-rear direction, and guides the cooling air (or warm air) generated in the air conditioner main body 31 forward. At the front end of the front duct 60, a defroster outlet 61, a foot outlet 62 for blowing cooling air or warm air to the feet of the worker, and cooling air or warm air backward toward the upper body of the worker. An outlet 63 for the predecessor for blowing out is provided. When the defroster is used, warm air is blown out from the defroster outlet 61.

[cover]
As shown in FIGS. 4 and 14, the plurality of covers include a central duct cover 70, a left rear duct cover 80A, a right rear duct cover 80B, and a front duct cover 90.

  The central duct cover 70 has a shape capable of covering part or all of the central duct 40 and the air conditioner main body 31 shown in FIG. The center duct cover 70 has a left opening 71 (left thigh opening) and a right opening 72 (right thigh opening). The left opening 71 is provided at a position corresponding to the left outlet 41 of the central duct 40 and is connected to the left outlet 41. The right opening 72 is provided at a position corresponding to the right outlet 42 of the central duct 40 and is connected to the right outlet 42.

  The left rear duct cover 80A has a shape capable of covering part or all of the left rear duct 50A shown in FIG. 5, and the right rear duct cover 80B covers part or all of the right rear duct 50B. Has a possible shape. As shown in FIGS. 4 and 14, each of the left rear duct cover 80A and the right rear duct cover 80B has a head opening 81, a ceiling opening 82, and the above-mentioned opening / closing member 83. The head openings 81 of the left rear duct cover 80A and the right rear duct cover 80B are provided at positions corresponding to the head outlets 51 of the left rear duct 50A and the right rear duct 50B. 51. The ceiling openings 82 of the left rear duct cover 80A and the right rear duct cover 80B are provided at positions corresponding to the ceiling outlets 52 of the left rear duct 50A and the right rear duct 50B, and are connected to the ceiling outlets 52. Have been.

  The front duct cover 90 has a shape capable of covering part or all of the front duct 60 shown in FIG. The front duct cover 90 has a defroster opening 91, a foot opening 92, and a front body opening 93. The defroster opening 91 is provided at a position corresponding to the defroster outlet 61 of the front duct 60 and is connected to the defroster outlet 61. The foot opening 92 is provided at a position corresponding to the foot outlet 62 of the front duct 60 and is connected to the foot outlet 62. The front opening 93 is provided at a position corresponding to the front opening 63 of the front duct 60 and is connected to the front opening 63.

[Summary of Embodiment]
According to the cab 7 described above, the cooling air guided by the left rear duct 50A and the right rear duct 50B is blown out from the head outlet 51 so that the head of the worker sitting on the driver's seat of the cab 7 can be used. Cooling air is supplied near the section. In addition, the cooling air guided by the ducts 50A and 50B allows the ceiling blowout 52 to be located above the head blowout 51, that is, the ceiling blowout closer to the ceiling than the head blowout 51. By being blown out from the outlet 52, the cooling air is efficiently supplied to the vicinity of the ceiling, and heat shielding near the ceiling is effectively performed. Further, in the cab 7, since the head outlet 51 and the ceiling outlet 52 are provided in the same duct, a duct dedicated to the ceiling outlet is provided separately from the duct in which the head outlet is provided. Need not be installed. Further, since the ceiling outlet 52 is provided above the head outlet 51, there is no need to provide an extension duct for bringing the outlet closer to the ceiling. Therefore, the structure of the air conditioner 30 can be prevented from becoming complicated.

  In the cab 7, the ceiling outlet 52 is located downstream of the flow of the cooling air in the rear ducts 50 </ b> A and 50 </ b> B with respect to the head outlet 51. An intermediate portion 57 between the air outlet 51 and the ceiling air outlet 52 includes a small flow path 53, and the cross-sectional area of the flow path of the small flow path 53 is the same as that of the head of the rear duct. It is smaller than the cross-sectional area of the flow path in the portion 56 where the air outlet 51 is provided. The small flow path portion 53 provided in the intermediate portion 57 has a smaller size than the case where the small flow passage portion 53 is not provided in the intermediate portion 57. It allows to increase the flow rate. Moreover, the small flow passage 53 increases the resistance when the cooling air passes through the small flow passage 53 as compared with the case where the small flow passage 53 is not provided in the intermediate portion 57. Therefore, it is possible to secure the amount of cooling air blown out from the head outlet 51 upstream of the small flow passage 53.

  In the cab 7, the small flow path 53 may be formed by providing a step on the inner surface of a duct defining a flow path of the intermediate portion 57, for example. However, when the cooling air flowing through the flow path of the duct collides with the step, the cooling air stagnates at the step, and the pressure loss tends to increase.

  Therefore, in the cab 7 according to the embodiment, the small flow passage portion 53 includes the flow passage gradually decreasing portion 54 in which the cross-sectional area of the flow passage becomes gradually smaller as approaching the ceiling outlet 52. The fact that the flow passage gradual decreasing portion 54 constitutes at least a part of the small flow passage portion 53 reduces the size of the step as compared with the case where the small flow passage portion 53 is constituted only by the step portion. Or the step portion can be omitted, thereby suppressing an increase in pressure loss.

  In the cab 7, at least the downstream portion of the intermediate portion 57 from the central portion 57C between the head outlet 51 and the ceiling outlet 52 to the ceiling outlet 52 is the flow path. It is constituted by a gradually decreasing portion 54. Since the flow passage gradual decreasing portion 54 constituting the downstream portion is adjacent to the ceiling outlet 52, the cooling air guided by the flow passage gradual decreasing portion 54 and having an increased flow velocity is supplied to the ceiling outlet 52. It is blown out smoothly from. This suppresses a decrease in the effect of increasing the flow rate of the cooling air by the small channel portion 53.

  The opening area of the ceiling outlet 52 is smaller than the opening area of the head outlet 51. Therefore, as compared with the case where the opening area of the ceiling outlet 52 is the same as the opening area of the head outlet 51, the flow rate of the cooling air is not only increased by the small flow path portion 53, but also increased. The height can also be increased by making the opening area of the ceiling outlet 52 smaller than the opening area of the head outlet 51.

  In the cab 7, the ceiling outlet 52 is provided at a downstream end 50D of the duct. Since the cooling air is not distributed downstream of the ceiling outlet 52 in each of the ducts 50A and 50B, the flow rate of the cooling air blown out from the ceiling outlet 52 is more effectively increased.

  The cab 7 includes an opening / closing member 83 for opening and closing the head outlet 51. In the above-described embodiment, the head outlet 51 and the ceiling outlet 52 are provided in each of the ducts 50A and 50B, and an opening / closing member 83 for opening and closing each head outlet 51 is provided. The operator can operate the opening / closing member 83 so that the cooling air is directly blown to the head of the worker and the cooling air is blown toward the ceiling. It is possible to switch between a state where cooling air is blown toward the ceiling and a state where cooling air is blown toward the ceiling. Therefore, the operator can cool the cab space as follows, for example. An operator may want to quickly cool his head immediately after entering the cab space of the cab 7 after working outside the cab 7 in summer, for example. On the other hand, after sufficiently cooling the head, the operator may feel uncomfortable rather than blowing the cooling air directly onto the head. Therefore, when the operator wants to quickly cool the head, the operator operates the opening / closing member 83 so that the cooling air is blown out from the outlet 51 for the head. The outlet 51 is opened. Then, after sufficiently cooling the head, the blowing of the cooling air from the outlet 51 for the head is prevented, and the cooling air from the outlet 52 for the ceiling is prevented. By operating the opening / closing member 83 so as to continue the blowing, the head outlet 51 is switched to the closed state. That is, the operator can cool the cab space as described above only by operating the opening / closing member 83.

[Modification]
The present invention is not limited to the embodiment described above. The present invention includes the following embodiments, for example.

  A) In the above embodiment, the head outlets 51 are provided on the respective side surfaces of the left rear duct 50A and the right rear duct 50B, but the invention is not limited to this. For example, as shown in FIG. 15, the left rear duct 50A includes a duct body 50A1 extending in the vertical direction, and a branch portion 50A2 branching from the side surface of the duct body 50A1 and extending laterally, and a head outlet. 51 may be provided in the branch part 50A2. The cab 7 of the present invention also includes a form as shown in FIG. Although not shown, the right rear duct 50B may have a structure according to a modification as shown in FIG.

  B) In the embodiment, the ceiling outlet 52 is located downstream of the flow of the cooling air in each of the ducts 50A and 50B with respect to the head outlet 51. The present invention is not limited to this, and may be located upstream of the flow of the cooling air.

  C) In the above-described embodiment, each of the ducts 50A and 50B includes the small flow path 53, but the small flow path 53 may be omitted.

  D) In the above embodiment, the cab 7 has the left rear duct 50A and the right rear duct 50B, but has only one rear duct having the head outlet 51 and the ceiling outlet 52. It may be something. In such a case, the rear duct may be provided on the left rear of the driver's seat 18, may be provided on the right rear, or may be provided directly behind the driver's seat 18.

  E) In the above embodiment, the driver's seat 18 has the headrest 18C, but is not limited to this. The driver's seat 18 may not have the headrest 18C. In such a case, the upper part of the driver's seat 18 is constituted by the upper part of the backrest 18B.

7 Cab 18 Driver's seat 20A, 20B Control box 30 Air conditioner 31 Air conditioner main body 40 Central duct 41 Left outlet for thigh 42 Right outlet for thigh 43 Left connection port 44 Right connection port 45 Connection port 50A Left rear duct 50B Right rear duct 50D Downstream end of left rear duct and right rear duct 51 Head outlet 52 Ceiling outlet 53 Small flow passage 54 Small flow passage 83 Opening / closing member

Claims (8)

A cab of construction machinery,
Driver's seat,
An air conditioner body having a function of cooling air,
A duct provided in the rear of the driver's seat and extending vertically, and guiding cooling air generated in the air conditioner body,
The duct is a head outlet for blowing out the cooling air toward a height position corresponding to an upper part of the driver's seat, and is located above the head outlet, and is provided on a ceiling of the cab. A ceiling outlet for blowing out the cooling air toward,
In the duct, a part of the cooling air guided by the duct is blown out from one of the head outlet and the ceiling outlet, and passes through the one outlet. A cab for a construction machine, wherein at least a part of the cooling air guided by a duct is blown out from the other of the head outlet and the ceiling outlet. The outlet for the ceiling is located downstream of the flow of the cooling air in the duct with respect to the outlet for the head,
An intermediate portion between the head outlet and the ceiling outlet of the duct includes a small flow path portion,
The cab of a construction machine according to claim 1, wherein a cross-sectional area of the flow path of the small flow path portion is smaller than a cross-sectional area of a flow path of a portion of the duct where the head outlet is provided.   The cab of a construction machine according to claim 2, wherein the small flow passage portion includes a flow passage gradually decreasing portion in which a cross-sectional area of the flow passage gradually decreases as approaching the ceiling outlet.   The downstream part of at least the central part between the outlet for the head and the outlet for the ceiling from the middle part to the outlet for the ceiling is constituted by the passage decreasing part. The cab of the construction machine according to 3.   The cab of a construction machine according to any one of claims 2 to 4, wherein an opening area of the ceiling outlet is smaller than an opening area of the head outlet.   The cab of a construction machine according to any one of claims 2 to 5, wherein the ceiling outlet is provided at a downstream end of the duct.   The cab of a construction machine according to any one of claims 2 to 6, further comprising an opening and closing member for opening and closing the head outlet. The ceiling outlet is located downstream of the flow of the cooling air in the duct with respect to the head outlet.
The cab of a construction machine according to claim 1, wherein an opening area of the ceiling outlet is smaller than an opening area of the head outlet.