JP7238289B2 - Construction machine cab - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cab of a construction machine equipped with an air conditioner.

In a cab of a construction machine, heat due to solar radiation is transferred to the cab space of the cab through the ceiling of the cab and the like, so that an operator sitting in the driver's seat may feel uncomfortable. For this reason, the cab is equipped with an air conditioner. For example, the air conditioner described in Patent Document 1 includes a left outlet provided on a left rear pillar located on the left rear of the driver's seat and a right outlet provided on the right rear pillar located on the right rear of the driver's seat. and a ceiling outlet provided in a rear cover located behind the driver's seat. In Patent Document 1, the rear window and the ceiling window are covered with an air curtain by cold air blown out from the ceiling outlet, and the left window and the right window are covered with an air curtain by cold air blown out from the left side outlet and the right side outlet. to be covered with

JP 2010-195196 A

By the way, in the air conditioner described in paragraph 0021 and FIG. 2 of Patent Document 1, the left outlet and the right outlet are positioned at a height at which air can be blown out to the left window portion and the right window portion facing the headrest. , and the ceiling outlet is provided below the left outlet and the right outlet. In such an arrangement, the distance between the ceiling air outlet and the ceiling is large, so the cooling air blown out from the ceiling air outlet can be easily diffused to the surroundings before reaching the ceiling, and the heat from the sun can be transferred to the vicinity of the ceiling. A sufficient heat shielding effect cannot always be obtained.

The present invention has been made to solve the above-mentioned problems. An object of the present invention is to provide a cab equipped with an air conditioner capable of simultaneously supplying cooling air to a vehicle.

SUMMARY OF THE INVENTION The present invention provides a cab for a construction machine comprising an undercarriage and an upper slewing body pivotably mounted on the undercarriage , the cab having a driver's seat and an air cooling function. An air conditioner main body and a plurality of ducts for guiding cooling air generated in the air conditioner main body are provided. The plurality of ducts include a left rear duct extending vertically at a position not overlapping the driver's seat in front view and at the left rear of the driver's seat, and a left rear duct extending vertically at a position not overlapping the driver's seat when viewed from the front, and a left rear duct extending vertically at a position at the rear left of the driver's seat and overlapping the driver's seat when viewed from the front. and a right rear duct extending vertically at a position where it does not. Each of the left rear duct and the right rear duct has a head air outlet for blowing the cooling air toward a height position corresponding to an upper portion of the driver's seat, and an air outlet above the head air outlet. and a ceiling outlet for blowing the cooling air toward the ceiling of the cab. In each of the left rear duct and the right rear duct , part of the cooling air guided by the duct is blown out from one of the head outlet and the ceiling outlet. At least part of the cooling air guided by the duct without being blown out from one of the air outlets passes through the one air outlet and is guided by the duct to the other of the head air outlet and the ceiling air outlet. It is configured to be blown out from the outlet. The ceiling outlet is provided in front of the duct so that the cooling air is blown forward from a position behind the driver's seat toward the ceiling of the cab.

In this cab, the head air outlet and the ceiling air outlet are provided in the same duct, and one of the air outlets of these air outlets provided upstream of the flow of the cooling air is supplied with the cooling air. Some or all of the remaining cooling air that has passed through the one air outlet without being blown out from the one air outlet is blown out from the other air outlet. Specifically, the cooling air guided by the duct is blown out from the head outlet, thereby supplying the cooling air to the vicinity of the head of the operator sitting in the driver's seat of the cab. Then, the cooling air guided by the duct is blown out from a ceiling blower outlet located above the head blower outlet, that is, from a ceiling blower outlet closer to the ceiling than the head blower outlet. Thus, the cooling air is efficiently supplied to the vicinity of the ceiling, and heat shielding in the vicinity of 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. There is no need to install a dedicated outlet duct. Therefore, in the present invention, the supply of cooling air to the vicinity of the head of the operator sitting in the driver's seat of the cab and the supply of cooling air for effectively shielding heat in the vicinity of the ceiling can be performed with a simple structure. can be made compatible.

In the cab of the construction machine, the ceiling outlet is positioned downstream of the head outlet in the flow of the cooling air in the duct, and the head outlet and the An intermediate portion between the ceiling outlet includes a small flow path, and the cross-sectional area of the flow path of the small flow path is the same as that of the portion of the duct where the head outlet is provided. It is preferably smaller than the cross-sectional area of the channel. In this aspect, the small flow passage provided in the intermediate portion has a flow rate of the cooling air blown out from the ceiling outlet compared to the case where the small flow passage is not provided in the intermediate portion. allow to increase Moreover, since the small flow passage portion increases the resistance when the cooling air passes through the small flow passage portion compared to the case where the small flow passage portion is not provided in the intermediate portion, the duct Prevents most of the cooling air guided by from being blown out from the ceiling outlet downstream of the small flow path, and is blown out from the head outlet upstream of the small flow path To make it possible to secure the air volume of cooling air.

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

For example, in the case where a portion where the cross-sectional area of the flow passage changes abruptly as described above is further formed downstream of the gradually decreasing portion of the flow passage in the intermediate portion, stagnation of the air flow may occur at the sudden change portion. 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, the cab of another construction machine according to the present invention includes a driver's seat, an air conditioner main body having a function of cooling air, and an air conditioner main body provided behind the driver's seat and extending in the vertical direction. a duct for guiding the cooling air, wherein the duct includes a head outlet for blowing the cooling air toward a height position corresponding to the upper part of the driver's seat; and the head outlet. a ceiling outlet for blowing the cooling air toward the ceiling of the cab; of the cooling air that is blown out from one of the outlet and the ceiling outlet, passes through the one outlet without being blown out from the one outlet, and is guided by the duct At least a part of the air is blown out from the other one of the head outlet and the ceiling outlet. An intermediate portion of the duct located downstream of the flow of the cooling air in the duct and between the head outlet and the ceiling outlet includes a small flow path section, and the small flow path section includes: The cross-sectional area of the flow path is smaller than the cross-sectional area of the flow path of the portion of the duct where the head air outlet is provided, and the small flow path portion gradually increases the flow rate as it approaches the ceiling air outlet. A flow passage tapering portion in which the cross-sectional area of the passage gradually decreases is included, and in the intermediate portion, the downstream side from at least a central portion between the head outlet and the ceiling outlet to the ceiling outlet. A portion is constituted by the channel taper . In this aspect, since the gradually decreasing flow path portion forming the downstream portion is adjacent to the ceiling air outlet, the cooling air guided by the gradually decreasing flow path portion and having an increased flow rate is supplied to the ceiling air outlet. It blows out smoothly from. This suppresses deterioration of the effect of increasing the flow velocity 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, compared to the case where the opening area of the ceiling blower outlet is the same as the opening area of the head blower outlet, the flow velocity of the cooling air is not only increased by the small flow path section but also the ceiling It can also be increased by making the opening area of the head outlet smaller than the opening area of the head outlet.

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

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

In the cab of the construction machine, the ceiling outlet is located downstream of the head outlet in the flow of the cooling air in the duct, 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 to the case where the opening area of the ceiling blower outlet is the same as the opening area of the head blower outlet, the flow velocity of the cooling air blown out from the ceiling blower outlet can be increased. 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. Also, the air volume of the cooling air blown out from the upstream air outlet for the head is ensured.

As described above, according to the present invention, while suppressing the structure of the air conditioner from becoming complicated, cooling air is supplied to the vicinity of the head of the operator sitting in the driver's seat of the cab, and the cooling air is supplied to the vicinity of the ceiling. It is possible to achieve both supply of cooling air for effective heat shielding.

1 is an overall side view of a hydraulic excavator that is a construction machine equipped with a cab according to an embodiment of the present invention; FIG. 1 is a perspective view showing an outline of a cab according to an embodiment; FIG. 1 is a schematic front view for explaining the positional relationship between a driver's seat, left and right control boxes, and a plurality of outlets of an air conditioner in a cab according to an embodiment; FIG. 1 is a perspective view showing an overview of an air conditioner in a cab according to an embodiment; FIG. 1 is a perspective view showing a duct structure of an air conditioner in a cab according to an embodiment; FIG. Fig. 6 is a front view of the air conditioner main body when viewed in the direction of arrow VI in Fig. 5; FIG. 6 is a plan view of the air conditioner body viewed in the direction of arrow VII in FIG. 5 ; Fig. 4 is a bottom view showing the central duct of the air conditioner in the cab according to the embodiment; Fig. 3 is a front view showing the central duct of the air conditioner in the cab according to the embodiment; Fig. 4 is a schematic left side view for explaining the positional relationship between the driver's seat and the left rear duct and right rear duct in the cab according to the embodiment; Fig. 2 is a schematic plan view for explaining the positional relationship among a driver's seat, left and right control boxes, and left and right thigh outlets of an air conditioner in the cab according to the embodiment; Fig. 4 is a right side view showing the left rear duct of the air conditioner in the cab according to the embodiment; Fig. 4 is a left side view showing a right rear duct of the air conditioner in the cab according to the embodiment; FIG. 5 is a right side view when the upper part of the left rear cover in FIG. 4 is viewed in the direction of arrow XIV; Fig. 10 is a right side view showing a modification of the left rear duct of the air conditioner in the cab according to the embodiment;

Preferred embodiments of the present invention will be described below with reference to the drawings.

[Overall structure of construction machinery]
FIG. 1 shows a hydraulic excavator, which is 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 work device 6 mounted on the upper revolving body 2 . The upper revolving body 2 has a revolving frame 2a connected to the lower traveling body 1, and a cab 7 mounted on the revolving frame 2a. The work device 6 includes a boom 3 that is connected to the front end of the revolving frame 2a (right front end in the example shown in FIG. 1) so as to be able to rise and fall, and a tip of the boom 3 that is turnably connected. It includes an arm 4 and a bucket 5 rotatably connected to the tip of the arm 4 .

The cab 7 is mounted on the front portion of the revolving frame 2a and adjacent to the boom 3 in the width direction of the revolving frame 2a (left front portion in the example shown in FIG. 1). Construct a cab for maneuvering. That is, in the cab 7, operations are performed to cause the lower traveling body 1 to travel, the upper revolving body 2 to revolve, and the work device 3 to perform work operations.

[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 travel pedals 8, 8, and left and right control boxes. 20A, 20B, left and right armrests 27A, 27B, and an air conditioner 30.

The floor plate 10 is a horizontal plate forming the floor of the cab 7, and the cab outer wall 12 defines a cab space above the floor plate 10. As shown in FIG. The seat stand 14 is fixed on the upper surface of the floor plate 10 . The intermediate plate 16 is arranged 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 in the longitudinal direction with respect to the seat stand 14 .

The driver's seat 18 is a seat on which an operator sits. The driver's seat 18 is arranged substantially in the center of the cab 7 in plan view. A window is provided at least on the front side of the cab outer wall 12, and a front view of the operator seated on the driver's seat 18 is ensured through this window. The driver's seat 18 has a seat portion 18A, a backrest portion 18B, and a headrest 18C. The seat portion 18A is a portion on which the worker's buttocks are placed. The backrest portion 18B is attached to the rear end portion of the seat portion 18A, is a portion that stands upward, and has a function of supporting the torso of the operator. The headrest 18C is a pillow-like member attached to the upper end of the backrest 18B and has a function of supporting the head of the operator. A headrest 18</b>C forms an upper portion of the driver's seat 18 .

The left and right traveling pedals 8, 8 are pedals for causing the lower traveling body 1 to travel. Travel pedals 8 , 8 are provided on a floor plate 10 . A worker sitting on the driver's seat 18 can make the lower traveling body 1 travel by stepping on the left and right traveling pedals 8, 8 located in front of the driver's seat 18.例文帳に追加

The left and right control boxes 20A and 20B are arranged 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 main body 24 .

The operation lever 22 is operated by an operator sitting on the driver's seat 18 and pivots forward, backward, leftward, and rightward. The operation is an operation for rotating the upper rotating body 2 or an operation for operating the work device 6 .

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

The plurality of switches 21 are provided on the upper surface 20S of each 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 . A plurality of switches 21 are provided behind the operating lever 22 (specifically, directly behind the operating lever 22).

As shown in FIGS. 2 and 3, the left and right control boxes 20A and 20B are fixed to the left and right ends of the intermediate plate 16 so as to slide integrally with the intermediate plate 16, and the driver's seat 18 is , 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 cab main 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 left and right control boxes 20A and 20B and the left and right control boxes 20A and 20B and the left and right control boxes 20A and 20B and the left and right control boxes 20A and 20B, respectively. It is possible to adjust the relative positional relationship in the front-rear direction with the armrests 27A and 27B. Specifically, in the longitudinal direction, 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. Further, by sliding the driver's seat 18 with respect to the intermediate plate 16, it is possible to adjust the relative position of the driver's seat 18 with respect to the left and right control boxes 20A and 20B and the left and right armrests 27A and 27B.

The left and right armrests 27A and 27B are arranged on the left and right sides of the driver's seat 18, respectively. The left and right armrests 27A and 27B are for supporting the left and right arms of the operator. As shown in FIG. 3 , each of the left and right armrests 27A and 27B has an armrest body 28 and a support member 29 . The armrest main body 28 is for supporting the operator's forearms when the operator sitting on the driver's seat 18 operates the operation lever 22, so that the armrest main body 28 is positioned directly above the left and right control boxes 20A and 20B. and has a shape extending in the front-rear direction so as to support the forearm of the operator.

The support member 29 is a member for supporting the armrest body 28 . In this embodiment, the support member 29 is connected to the rear end portion of the armrest body 28 and supports the armrest body 28 so as to be rotatable about the rear end portion. 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 body 28 . Thereby, the armrest main body 28 is supported by the frame 25 via the support member 29 . Therefore, when the intermediate plate 16 slides in the longitudinal direction with respect to the seat stand 14 as described above, the left and right armrests 27A and 27B move in the longitudinal direction integrally with the left and right control boxes 20A and 20B. The support member 29 also has a height adjustment mechanism for adjusting the height of the armrest body 28 .

Since the valves such as the pilot valves are members whose temperature is likely to rise during operation of the construction machine, the temperature of the control boxes 20A and 20B having the valves such as the pilot valves is also likely to rise. A worker sitting in the driver's seat 18 located between the left and right control boxes 20A, 20B may feel uncomfortable (feel hot) especially around the thighs due to the heat of the control boxes 20A, 20B. . Therefore, the cab 7 according to this embodiment includes an air conditioner 30 as described below. The air conditioner 30 supplies cooling air to the vicinity of the thighs of the operator sitting in the driver's seat 18 of the cab 7, supplies cooling air to the vicinity of the operator's head, and provides heat shielding in the vicinity of the ceiling. Cooling air can be supplied for effective cooling.

[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 showing an overview of the air conditioner 30 in the cab 7 according to this embodiment, and FIG. 5 is a perspective view showing the duct structure of the air conditioner 30 in the cab 7 according to this embodiment. . As shown in FIGS. 4 and 5, the air conditioner 30 includes an air conditioner body 31, a plurality of ducts 40, 50A, 50B and 60, and a plurality of covers 70, 80A, 80B and 90 covering these ducts. And prepare.

The air conditioner main body 31 is not particularly limited as long as it has a cooling function for cooling at least the air in the cab space. The air conditioner body 31 may further have a heating function, a dehumidification function, and the like. In this embodiment, the air conditioner main body 31 is arranged on the floor plate 10 behind the driver's seat 18 .

As shown in FIGS. 6 and 7, the air conditioner main body 31 has 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 through the air suction port 32 and cooled, and then blown out from the air outlets 34 and 35 .

In this embodiment, the air conditioner main body 31 has a substantially rectangular parallelepiped shape with a lateral dimension larger than a longitudinal dimension. The air suction port 32 and the fan 33 are arranged at a position biased to one side of the air conditioner main body 31 in the horizontal direction (the left side in the specific examples of FIGS. 6 and 7), and the air outlets 34 and 35 are , the other side of the air conditioner main body 31 in the horizontal direction (the right side in the specific examples of FIGS. 6 and 7). Further, 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 with a lateral dimension larger than a longitudinal dimension. The air outlet 35 is provided on the side surface of the casing 36 (the right side surface in the specific examples of FIGS. 6 and 7).

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

[Central duct]
As shown in FIGS. 5, 6 and 8, the central duct 40 receives cooling air blown out from an air outlet 34 provided on the upper surface of the air conditioner main body 31 and directs the cooling air to the right and left. to each of the Further, in this embodiment, the central duct 40 is interposed between the air outlet 34 of the air conditioner body 31 and the left rear duct 50A and the right rear duct 50B, and directs 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 (an elongated shape in the left-right direction). The central duct 40 includes a left outlet 41 (left thigh outlet 41), a right outlet 42 (right thigh outlet 42), a left connection port 43, a right connection port 44, and a connection port 45 (air inlet) and

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 in the left-right direction.

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 horizontal dimension is larger than its longitudinal dimension. 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 45A and the right end 45B of the connection port 45 is the same as the left outlet 41. It is in a position biased to one side in the left-right direction (to the right 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 central position C1 of the connection port 45 is closer to the right outlet 42 than to the left outlet 41 . When the connection ports 45 are unevenly distributed in the horizontal direction as described above, the amount of air blown out from the right air outlet 42 is larger than the air amount blown out from the left air outlet 41 . Further, as shown in FIG. 7, in the present embodiment, in the air conditioner body 31, the fan 33 is located at a position biased to the other side in the horizontal direction (to the left side in the specific example shown in FIG. 7) with respect to the air outlet 34. are placed. In such a case, the air sent to the air outlet 34 by the fan 33 is likely to be biased toward one side of the air outlet 34 in the horizontal direction (to the right in the specific example shown in FIG. 7).

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

The minimum flow path portion 46 is defined as the cross-sectional area of the flow path in the portion between the right end 41E (inner end) of the left outlet 41 and the left end 42E (inner end) of the right outlet 42 in the central duct 40. is the smallest part. When comparing the cross-sectional area of the flow channel in the portion between the right end 41E and the left end 42E, the cross-sectional area of the flow channel is the cross-sectional area of the central duct 40 cut along a plane perpendicular to the left-right direction. It is the area (area of the flow path) of the portion inside the inner surface of the central duct 40 in the cross section.

The left air outlet 41 and the right air 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. be. The left blower outlet 41 and the right blower outlet 42 are open forward so that the cooling air can be blown forward. The left air outlet 41 and the right air outlet 42 are arranged at a height position and a left and right position capable of supplying cooling air to the vicinity of the thighs of the operator seated in the driver's seat 18 . In this embodiment, the left outlet 41 and the right outlet 42 are provided at the left end and 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 are for distributing 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 are opened rearward or obliquely rearward. The left connection port 43 is connected to the connection port 55 of the upstream end portion 50U (lower end portion 50U) of the left rear duct 50A. The right connection port 44 is connected to the connection port 55 of the upstream end portion 50U (lower end portion 50U) of the right rear duct 50B. The left connecting port 43 is provided at the left end of the central duct 40 and the right connecting 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 cooling air guided by the central duct 40 and distributed to the left rear duct 50A and the right rear duct 50B is suppressed from being uneven in the left and right air volume. .

[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 upward the cooling air generated in the air conditioner body 31 . The detailed configurations of the left rear duct 50A and the right rear duct 50B are slightly different in terms of concave and convex shapes and curved shapes in order to avoid interference with other members constituting the cab 7. The basic configurations regarding the features of the embodiments are common.

Each of the left rear duct 50A and the right rear duct 50B has a shape extending in the vertical direction (a shape elongated in the vertical direction). 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 the 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. As shown in FIG.

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 above the vertical center position of the headrest 18C. As shown in FIGS. 3 and 10 , the cooling air F1 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, for example, by a known wind direction adjusting member (not shown) provided in the head openings 81 of the duct covers 80A and 80B, which will be described later.

The ceiling outlet 52 is located downstream of the head outlet 51 in the flow of the cooling air in the duct. The ceiling outlet 52 is provided at the downstream end 50D of the duct. The ceiling outlet 52 is arranged above the head outlet 51 with a space therebetween. Therefore, 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 position corresponding to the upper end 51U of the head outlet 51 and a height corresponding to the lower end 52D of the ceiling outlet 52 in the rear duct. It is the part between the positions.

The intermediate portion 57 includes a small channel portion 53 . The cross-sectional area of the channel of the small channel portion 53 is smaller than the cross-sectional area of the channel of the portion 56 (large channel portion 56) of the rear duct where the head outlet 51 is provided. The large flow path 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. be. In the present embodiment, the cross-sectional area of the passage of the large passage portion 56 is substantially constant from the lower end to the upper end of the large passage portion 56, but is not limited to this. It may vary in between.

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 the cross section when the rear duct is cut along a plane orthogonal to the vertical direction. is the area of the portion inside the inner surface of the (area of the flow path).

In the present embodiment, the small channel portion 53 includes a gradually decreasing channel portion 54 in which the cross-sectional area of the channel gradually decreases as the ceiling outlet 52 is approached. In the present embodiment, in the intermediate portion 57, at least the downstream portion from the central portion 57C between the head outlet 51 and the ceiling outlet 52 to the ceiling outlet 52 is the flow passage gradually decreasing portion 54. It is composed by The downstream portion is a portion of the rear duct between the height position corresponding to the central position 57C and the height position corresponding to the lower end 52D of the ceiling outlet 52 . In addition, the entire intermediate portion 57 may be configured by the flow passage gradually decreasing portion 54 . In the present embodiment, the flow path gradually decreasing portion 54 has a shape such that the flow path of the cooling air is narrowed as it approaches 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 this embodiment, the head outlet 51 is configured by a single opening, and the ceiling outlet 52 is configured by a single opening, but this is not the only option. The head outlet 51 may be configured with a plurality of openings, and the ceiling outlet 52 may be configured with a plurality of openings. When the air outlet 51 for the head is composed of a plurality of openings, the opening area of the air outlet 51 for the head is the sum of the opening areas of the plurality of openings. When the ceiling outlet 52 is composed of 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/closing the head outlet 51 . The opening/closing member 83 is provided on duct covers 80A and 80B, which will be described later. The opening/closing member 83 has, 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 forward the cooling air (or warm air) generated in the air conditioner body 31 . At the front end of the front duct 60, there are 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. A blowout port 63 for blowing out is provided. When a defroster is used, warm air is blown out from the defroster outlet 61 .

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

The central duct cover 70 has a shape capable of covering part or all of the central duct 40 and the air conditioner body 31 shown in FIG. The central 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 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 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 shape that allows 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 opening/closing member 83 described above. 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. It is

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 opening 93 . The defroster opening 91 is provided at a position corresponding to the defroster outlet 61 of the front duct 60 and 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 body opening 93 is provided at a position corresponding to the front body air outlet 63 of the front duct 60 and is connected to the front body air outlet 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 air outlet 51, so that the head of the operator sitting in the driver's seat of the cab 7 is cooled. Cooling air is supplied to the vicinity of the part. In addition, the cooling air guided by the ducts 50A and 50B passes through the ceiling air outlet 52 located above the head air outlet 51, that is, the ceiling air outlet closer to the ceiling than the head air outlet 51. By blowing out from the outlet 52, the cooling air is efficiently supplied to the vicinity of the ceiling, and heat shielding in the vicinity of the ceiling is effectively performed. Furthermore, in the cab 7, since the head outlet 51 and the ceiling outlet 52 are provided in the same duct, the duct dedicated to the ceiling outlet is separate from the duct provided with the head outlet. does not need to be installed. Further, since the ceiling outlet 52 is provided above the head outlet 51, there is no need to install an extension duct for bringing the outlet closer to the ceiling. Therefore, it is possible to prevent the structure of the air conditioner 30 from becoming complicated.

In the cab 7, the ceiling air outlet 52 is located downstream of the head air outlet 51 in the flow of the cooling air in the rear ducts 50A and 50B. An intermediate portion 57 between the air outlet 51 and the air outlet 52 for the ceiling includes a small flow passage portion 53, and the cross-sectional area of the flow passage of the small flow passage portion 53 is the same as that of the head portion of the rear duct. It is smaller than the cross-sectional area of the passage of the portion 56 where the air outlet 51 is provided. The small flow passage portion 53 provided in the intermediate portion 57 reduces the amount of cooling air blown out from the ceiling outlet 52 compared to the case where the small flow passage portion 53 is not provided in the intermediate portion 57. Allows for increased flow velocity. Moreover, the small flow passage portion 53 increases the resistance when the cooling air passes through the small flow passage portion 53, compared to the case where the small flow passage portion 53 is not provided in the intermediate portion 57. Therefore, it is possible to ensure the air volume of the cooling air blown out from the head outlet 51 upstream of the small flow path portion 53 .

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

Therefore, in the cab 7 according to the embodiment, the small flow path portion 53 includes the gradually decreasing flow path portion 54 in which the cross-sectional area of the flow path gradually decreases as the ceiling outlet 52 is approached. Forming at least part of the small flow channel portion 53 with the flow channel gradually decreasing portion 54 reduces the size of the step compared to the case where the small flow channel portion 53 is configured only by the stepped portion. Alternatively, it is possible to omit the stepped portion, thereby suppressing an increase in pressure loss.

In the cab 7, in the intermediate portion 57, at least the downstream portion 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 composed of a gradually decreasing portion 54 . Since the flow path gradually decreasing portion 54 that constitutes the downstream portion is adjacent to the ceiling outlet 52 , the cooling air guided by the flow path gradually decreasing portion 54 and having an increased flow velocity flows through the ceiling outlet 52 . It blows out smoothly from. This suppresses the reduction in the effect of increasing the flow velocity of the cooling air by the small flow path portion 53 .

The opening area of the ceiling outlet 52 is smaller than the opening area of the head outlet 51 . Therefore, compared to 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 velocity of the cooling air is not only increased by the small flow path portion 53, but also It is also enhanced 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 the downstream end 50D of the duct. Since the cooling air is not distributed downstream of the ceiling blower outlet 52 in each of the ducts 50A and 50B, the flow velocity of the cooling air blown out from the ceiling blower outlet 52 is further effectively increased.

The cab 7 includes an opening/closing member 83 for opening/closing the head outlet 51 . In the above-described embodiment, each of the duct 50A and the duct 50B is provided with the head outlet 51 and the ceiling outlet 52, and an opening/closing member 83 for opening and closing each head outlet 51 is provided. Therefore, the operator can operate the opening/closing member 83 only by operating the opening/closing member 83 so that the cooling air is blown directly to the operator's head and the cooling air is blown toward the ceiling. It is possible to switch between a state in which the cooling air is prevented from being blown directly to the head of the head and the cooling air is blown toward the ceiling. Therefore, the operator can cool the cab space as follows, for example. A worker may want to quickly cool the head immediately after entering the cab space of the cab 7 after performing work outside the cab 7 in the summer, for example. On the other hand, after the head has been sufficiently cooled, the worker may rather feel uncomfortable with the cooling air blowing directly onto the head. Therefore, when the operator wants to cool the head quickly, the operator operates the opening/closing member 83 so that the cooling air is blown out from the head outlet 51 to cool the head. The outlet 51 is opened. After the head is sufficiently cooled, the operator prevents the blowing of the cooling air from the head outlet 51 and the cooling air from the ceiling outlet 52. The opening/closing member 83 is operated to switch the head outlet 51 to the closed state so as to continue blowing. 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 embodiments described above. The present invention includes, for example, the following aspects.

A) In the above-described embodiment, the head outlet 51 is provided on each side surface of the left rear duct 50A and the right rear duct 50B, but this is not the only option. For example, as shown in FIG. 15, the left rear duct 50A includes a vertically extending duct body 50A1 and a laterally extending branch portion 50A2 branched from the side surface of the duct body 50A1. 51 may be provided at the branch portion 50A2. The cab 7 of the present invention also includes a form as shown in FIG. Although illustration is omitted, the right rear duct 50B may have a structure according to a modification as shown in FIG.

B) In the above embodiment, the ceiling outlet 52 is located downstream of the head outlet 51 in the flow of the cooling air in each of the ducts 50A and 50B. It is not limited and may be located upstream of the flow of the cooling air.

C) In the above embodiment, each of the ducts 50A and 50B has the small flow passage portion 53, but the small flow passage portion 53 may be omitted.

D) In the above embodiment, the cab 7 has a left rear duct 50A and a right rear duct 50B, but has only one rear duct with a head outlet 51 and a ceiling outlet 52. can be anything. In such a case, the rear duct may be provided to the left rear of the driver's seat 18 , may be provided to 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 this is not the only option. The driver's seat 18 may not have the headrest 18C, and in such a case, the upper portion of the driver's seat 18 is formed by the upper portion of the backrest portion 18B.

7 Cab 18 Driver's Seat 20A, 20B Control Box 30 Air Conditioner 31 Air Conditioner Body 40 Central Duct 41 Left Thigh Outlet 42 Right Thigh Outlet 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 channel portion 54 gradually decreasing channel portion 83 opening/closing member

Claims (8)

A cab for a construction machine comprising a lower traveling body and an upper revolving body rotatably mounted on the lower traveling body ,
driver's seat and
an air conditioner body having a function of cooling air;
a plurality of ducts for guiding cooling air generated in the air conditioner main body,
The plurality of ducts include a left rear duct extending vertically at a position not overlapping the driver's seat in front view and at the left rear of the driver's seat, and a left rear duct extending vertically at a position not overlapping the driver's seat when viewed from the front, and a left rear duct extending vertically at a position at the rear left of the driver's seat and overlapping the driver's seat when viewed from the front. a right rear duct extending vertically at a position where
Each of the left rear duct and the right rear duct has a head air outlet for blowing the cooling air toward a height position corresponding to an upper portion of the driver's seat, and an air outlet above the head air outlet. and a ceiling outlet for blowing the cooling air toward the ceiling of the cab,
In each of the left rear duct and the right rear duct , part of the cooling air guided by the duct is blown out from one of the head outlet and the ceiling outlet. At least part of the cooling air guided by the duct without being blown out from one of the air outlets passes through the one air outlet and is guided by the duct to the other of the head air outlet and the ceiling air outlet. configured to be blown out from the outlet,
The cab of the construction machine, wherein the ceiling outlet is provided in front of the duct so that the cooling air is blown forward from a position behind the driver's seat toward the ceiling of the cab. The ceiling outlet is located downstream of the head outlet in the flow of the cooling air in the duct,
an intermediate portion of the duct between the head outlet and the ceiling outlet includes a small flow path,
2. The cab of the construction machine according to claim 1, wherein the cross-sectional area of the flow path of said small flow path portion is smaller than the cross-sectional area of the flow path of a portion of said duct provided with said outlet for head portion. 3. The cab of the construction machine according to claim 2, wherein said small flow path portion includes a gradually decreasing flow path portion in which the cross-sectional area of said flow path gradually decreases as it approaches said ceiling outlet. A cab for a construction machine,
driver's seat and
an air conditioner body having a function of cooling air;
a duct provided behind the driver's seat and extending in the vertical direction to guide cooling air generated in the air conditioner main body,
The duct includes a head air outlet for blowing out the cooling air toward a height position corresponding to an upper portion of the driver's seat, and a head air outlet positioned above the head air outlet and on the ceiling of the cab. a ceiling outlet for blowing the cooling air toward the
In the duct, part of the cooling air guided by the duct is blown out from one of the head air outlet and the ceiling air outlet, and is not blown out from the one air outlet. At least part of the cooling air that passes through the one outlet and is guided by the duct is blown out from the other of the head outlet and the ceiling outlet. ,
The ceiling outlet is located downstream of the head outlet in the flow of the cooling air in the duct,
an intermediate portion of the duct between the head outlet and the ceiling outlet includes a small flow path,
The cross-sectional area of the flow path of the small flow path portion is smaller than the cross-sectional area of the flow path of the portion of the duct where the head outlet is provided,
The small channel portion includes a channel gradually decreasing portion in which the cross-sectional area of the channel gradually decreases as the ceiling outlet is approached,
In 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 constituted by the flow passage gradually decreasing portion . machine cab. The cab of the construction machine according to any one of claims 2 to 4, wherein an opening area of said ceiling outlet is smaller than an opening area of said head outlet. The cab of the 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 construction machine cab according to any one of claims 2 to 6, further comprising an opening/closing member for opening/closing the head outlet. The ceiling outlet is positioned downstream of the head outlet in the flow of the cooling air in the duct,
2. The cab of the construction machine according to claim 1, wherein an opening area of said ceiling outlet is smaller than an opening area of said head outlet.

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