JP4909960B2 - Hydraulic excavator air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning device for a hydraulic shovel capable of obtaining a wide space in a cab and facilitating a layout work for a duct for distributing air into required portions in the cab. <P>SOLUTION: In the air conditioning device 20 installed in a cab 10 of the hydraulic shovel provided with a cab from a center part to a left end of a turning frame 3a, and mounted with a work machine having a boom, an arm, and a bucket at a front end of the turning frame 3a, an air conditioning unit 21 is mounted on a front part of a right side wall face 51 of the cab 10, and the duct 31a for distributing air blown from the air conditioning unit 21 to a front glass 14 of the cab 10 is provided to an interior cover for covering the air conditioning unit 21. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an air conditioner installed in a cab of a hydraulic excavator.

  Some construction machines such as hydraulic excavators are provided with a cab provided with a work implement operating device and a traveling control device in a room surrounded by a door for entrance and exit and a wall surface having a window. In recent years, an air conditioner (hereinafter referred to as an air conditioner) for improving operability (window glass defroster or the like) and comfortability (air conditioning or air conditioning) has been frequently used. Conventionally, this air conditioner has, for example, a space between an operator seat and a rear wall surface of the cab (see, for example, Patent Document 1) for the purpose of ensuring a wide space in the cab and ensuring visibility of the operator. It is installed on the rear wall, the floor surface below the operator seat (for example, see Patent Document 2), or the cab ceiling surface (for example, see Patent Document 3).

JP-A-8-183323 (page 3, FIG. 1) Japanese Patent Laid-Open No. 2001-55760 (page 4, FIGS. 2 and 4) Japanese Utility Model Publication No. 53-52549 (page 3-5, Fig. 1-4)

However, the conventional air conditioner has the following problems.
In order to guide the air blown out from the air conditioner to the air outlet near the operator's feet and face and the air outlet for the defroster near the front and / or side window glass, It is necessary to lay an air duct that connects the mouth. However, when this is installed in the cab, there is a problem that the space in the cab becomes narrower by the amount of the duct space. Moreover, the duct which connects an air conditioner and a specific blower outlet becomes long, and in the example described in Patent Document 1, from the air conditioner at the rear of the cab to the vicinity of the operator's face, the vicinity of the front and side windows. In the example described in Patent Document 2, the duct length to be laid is extended from the air conditioner below the operator seat to the vicinity of the operator's face, the front and side windows, respectively. In the example described in Document 3, since the ducts from the air conditioner on the cab ceiling surface to the feet are long, it takes time to install these ducts, which increases the manufacturing cost.

  The present invention has been made paying attention to the above-mentioned problems, and provides an air conditioner for a hydraulic excavator that can secure a wide space in the cab and can easily install a duct that distributes air to various points in the cab. The purpose is to do.

The present invention provides a hydraulic excavator in which a cab is provided from the front center portion to the left end portion of the swing frame, and a work machine having a boom, an arm, a bucket, and the like is attached to the front end portion of the swing frame. In the air conditioner installed in the cab, an air conditioning unit is attached to the front of the right side wall surface of the cab, and a duct for introducing air blown from the air conditioning unit is integrated with the back surface of the interior cover that covers the air conditioning unit. It is provided by molding, and the duct is provided with a blowing hole for blowing the air to the front glass of the cab.

  According to the present invention, since the air conditioning unit is attached to the front part of the right side wall surface of the cab, which is a position close to both the face part and the foot part of the operator and the front and side window glass, installation of a long duct or the like is possible. Therefore, it is very easy to distribute air to the face portion, the foot portion, and the front glass of the operator. Accordingly, the duct laying operation time is shortened, and the manufacturing cost can be reduced. Further, this reduces the duct space and attaches the air conditioning unit to the wall surface, so that a large space in the cab can be secured.

  In addition, the interior cover that covers the air conditioning unit has a duct that distributes the air blown from the air conditioning unit to the front glass, so there is no need to install a new duct, saving the space for laying the duct A large internal space can be secured. Moreover, since the air conditioning unit and the duct are hidden by this cover, the appearance can be improved.

  In the present invention, the air conditioning unit is preferably attached to the right wall surface so that it can be taken in and out from the inside and outside of the cab.

  According to such a configuration, the air conditioning unit is attached so that it can be taken in and out from the inside and outside of the cab, so that it can be attached from the outside to the right wall surface when assembling the cab alone, and removed from the inside of the cab during maintenance after mounting the vehicle. Can be installed. Thereby, workability at the time of assembly and maintenance can be improved.

  In this invention, it is preferable that the said air conditioning unit is set as the structure attached also as a part of right side wall surface.

  According to such a configuration, since the air conditioning unit is attached also as a part of the right wall surface, the amount of protrusion of the air conditioning unit into the cab is reduced, and a large space in the cab can be secured. This also simplifies the structure for attaching the air conditioning unit so that it can be taken in and out from the inside and outside of the cab.

  In this invention, it is preferable to set it as the structure which provided the piping connection part of the said air conditioning unit in the site | part exposed to the cab outer side.

  According to such a configuration, the piping for hot water and refrigerant gas to the air conditioning unit can be connected to the piping connecting portion provided in the portion exposed to the outside of the cab, so that the piping is passed through the side wall surface and floor surface of the cab. Holes and connecting portions are not required, and this reduces the number of pipe seal locations and facilitates sealing, while reducing gas leaks and water leak locations and improving reliability. In addition, since piping between the air conditioning unit and the radiator, gas compressor, and the like can be directly performed substantially linearly, the piping path can be shortened and piping work is facilitated.

  In this invention, it is preferable to set it as the air conditioner which has the shape where the vehicle front side upper part was cut by the inclination of front-down.

  According to such a configuration, the air conditioner (including the air conditioner unit and the interior cover that covers the air conditioner unit) has a shape in which the upper part on the front side of the vehicle is cut with a forward-declining slope. The front view of the right side of the vehicle is not obstructed by the air conditioner, and the right front view of the operator can be sufficiently secured. Further, conventionally, the air conditioner can be installed at the position on the right side of the cab where the air conditioner has not been installed because of fear of lowering the right front visibility, and the above-described excellent effects can be obtained.

  In the present invention, it is preferable that the introduction port for introducing the outside air to the air conditioning unit is provided on the right side wall surface of the cab above the exterior cover.

  According to such a configuration, since the vicinity of the introduction port provided on the right side wall surface of the cab above the exterior cover is located substantially in the center of the vehicle, the air introduced from the introduction port is mixed with dust, the engine Since there is little influence of a temperature rise due to warm air after cooling, air suitable for air conditioning can be introduced. Thereby, the lifetime of the outdoor air filter can be improved, the air conditioning efficiency can be improved, and the like.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  First, with reference to FIGS. 1 to 3, a schematic configuration of a rear ultra-small turning type hydraulic excavator as an example of an application machine of the present invention will be described. FIG. 1 is a side view of a hydraulic excavator as an example of an application machine of the present invention, FIG. 2 is a partial cross-sectional side view of an upper swing body of the hydraulic excavator, and FIG. It is.

  In these drawings, the excavator 1 has an upper swing body 3 mounted on a lower traveling body 2 so that the upper swing body 3 can freely pivot. From the front central portion of the swing frame 3a provided at the lower portion of the upper swing body 3 A cab 10 is provided, and a count weight 4 is attached to the rear end of the revolving frame 3a. The cab 10 is connected to a bracket 15 provided at the front end of the revolving frame 3a via a horizontal pin 16 so as to be swingable in the front-rear direction, and can be tilted around the horizontal pin 16 by a predetermined angle. An engine 7 is provided in front of the counterweight 4 below the operator seat 11 provided slightly rearward of the central portion of the cab 10. A hydraulic oil tank and a fuel tank are installed on the right side of the cab 10 on the right side of the revolving frame 3 a, and these are covered with an exterior cover 8. In addition, a swing bracket 6 to which a work machine 5 having a boom, an arm, a bucket, and the like is swingably mounted in a vertical plane is swingable left and right (hereinafter referred to as swing) at the front end of the swing frame 3a. Is attached. The hydraulic excavator 1 is a rear ultra-small turning type in which the turning trajectory of the rear end portion of the upper turning body 3 is within the width of the left and right crawler tracks of the lower traveling body 2.

  An air conditioner 20 is provided in front of the right side wall surface of the cab 10. The air conditioner 20 has an air conditioning unit 21 having functions such as cooling and heating, an interior cover that covers the air conditioning unit 21 from the inside of the cab 10, and air that is blown by the air conditioning unit 21 in a predetermined direction. An air conditioning cover 22 that also serves as an air conditioning duct is provided. The air conditioning unit 21 is provided so as to form a part of the right side wall surface, that is, to be fitted into an opening formed through the right side wall plate 51, and a part of the outside of the case of the air conditioning unit 21 is the right side wall plate 51. The pipe connection portion of the air conditioning unit 21 is provided in the case portion that protrudes outward from the cab 10. As shown in FIGS. 1 and 2, at least one of the air conditioning unit 21 and the air conditioning cover 22 (both in the present embodiment) has an upper part on the front side of the vehicle (upper left side when viewed from the inside of the cab) as viewed from the side. It has a slanted shape. Moreover, the substantially triangular window glass 12 is engage | inserted by the cab side wall surface above this inclination part.

Next, the configuration of the air conditioning unit 21 will be described with reference to FIG. FIG. 4 is a side view of the air conditioning unit.
In FIG. 4, the air conditioning unit 21 has a heat exchange chamber 23 on the vehicle front side and an outdoor air introduction chamber 27 on the rear side formed by a partition plate 27 a provided on the rear side (right side in the drawing) in the case 21 a. The heat exchange chamber 23 and the outside air introduction chamber 27 communicate with each other through a through hole (not shown) provided in the lower portion of the partition plate 27a. In the heat exchange chamber 23, an evaporator 24 having a cooling and dehumidifying function and a heater core 25 having a heating function are provided, and a tray having a drain pipe 24a is provided at the bottom. Hot water pipes 61 and 62 for supplying / discharging hot water to / from the heater core 25 and a cooling medium gas to the evaporator 24 are provided on the side of the heat exchange chamber 23 on the vehicle front side and outside the cab that protrudes outward from the right side wall plate 51. Refrigerant gas pipes 63 and 64 for supplying and discharging are provided. Hot water pipes 61 and 62 are connected to hot water pipes branched from the engine 7, and refrigerant gas pipes 63 and 64 are connected to refrigerant gas pipes from the gas compressor and receiver dryer, respectively. Also, an inside air introduction hole 26 is formed on the side surface inside the cab of the heat exchange chamber 23, and the evaporator is configured so that most of the air introduced from the inside air introduction hole 26 passes through the heat exchange part of the evaporator 24. The outer periphery of 24 is sealed with packing such as rubber.

  In addition, a blower (not shown) is provided in the upper part of the heat exchange chamber 23, and blower holes 29 and 29 are formed in the upper surface of the heat exchange chamber 23. An inside / outside air switching valve (not shown) is provided in the vicinity of the entrance of the outside air introduction chamber 27, and this inside / outside air switching valve is provided in an air conditioning operation unit 70 installed beside the air conditioner 20 described later (see FIG. 5). Switching is possible by the provided inside / outside air changeover switch 74. The air conditioning unit 21 introduces inside air or outside air, and blows air adjusted by the evaporator 24 and the heater core 25 upward from the blow holes 29 and 29 by a blower.

Next, the air conditioning cover 22 will be described in detail with reference to FIGS.
FIG. 5 is a perspective view of the air conditioning cover and the air conditioning operation unit. As shown in FIG. 5, the air conditioning cover 22 includes an inside air cover 30 that covers the air conditioning unit 21 from the inside of the cab, and an outside air duct 40 that is attached to the back surface of the inside air cover 30 for introducing outside air. ing. The inside air cover 30 and the outside air duct 40 are manufactured by vacuum molding or press molding of synthetic resin. An air conditioning operation unit 70 for operating the operation of the air conditioning unit 21 is attached to the right side of the right side wall plate 51 of the cab 10 and the air conditioning cover 22. The air conditioning operation unit 70 is provided with a power switch 73, a temperature adjustment unit 71, an air volume adjustment unit 72, and an inside / outside air changeover switch 74.

  6 and 7 are perspective views of the inside air cover as seen from the inside and the outside of the cab 10, respectively. A hollow duct is integrally formed on the back surface portion of the inside air cover 30, and a middle duct 31 a is provided at a position facing the air blowing holes 29, 29 on the upper surface of the air conditioning unit 21, and is approximately on the upper outer peripheral portion of the inside air cover 30. An upper duct 31b that communicates with the middle duct 31a is formed horizontally, and a lower duct 31c that communicates with the middle duct 31a is formed on the lower outer peripheral portion of the inside air cover 30. An introduction port 32 for introducing conditioned air is provided at a position of the middle duct 31a facing the air holes 29, 29 of the air conditioning unit 21.

The middle duct 31a, the upper duct 31b, and the lower duct 31c are respectively formed with middle, upper, and lower blowing holes 33a, 33b, and 33c and communicated with the interior of the cab 10. In these blowing holes 33a, 33b, and 33c, blowing members 39a, 39b, and 39c (see FIG. 5) capable of adjusting the wind direction are respectively inserted.
In addition, an outside air duct mounting portion 34 is formed in a concave shape at a portion surrounded by the middle duct 31a and the upper duct 31b.

  A lower portion of the inside air cover 30 is formed in a convex shape toward the inside of the cab, and an inside air introduction hole (configured by a slit in this embodiment) 35 is formed in the convex portion. Further, a vertically long filter replacement hole 36 that is slightly longer than the vertical length of the inside air introduction hole 35 is formed on the left side of the inside air introduction hole 35 and on the side surface of the convex portion. Filter guide grooves 37 and 37 are formed in the upper and lower portions of the back surface of the introduction hole 35. An inside air filter 38 is inserted from the filter replacement hole 36, guided by the filter guide grooves 37, 37, and attached to the back side of the inside air introduction hole 35.

  A mounting bracket 30a is attached to the lower end portion of the inside air cover 30, and the inside air cover 30 is attached to the floor plate 13 of the cab 10 via the mounting bracket 30a.

Next, the outside air duct 40 will be described in detail with reference to FIGS.
8 and 9 are perspective views of the outside air duct as viewed from the outside and inside of the cab 10, respectively. The outside air duct 40 has a box-shaped filter chamber portion 41 and a duct portion 42 communicating with the filter chamber portion 41. The filter chamber portion 41 has an outside air introduction port 46 opened to the outside of the cab 10 chamber, and a filter contact portion 43 and a filter locking portion 44 are formed inside the left and right side portions. An outside air filter 45 is inserted from the outside air introduction port 46, positioned as abutted against the abutting portion 43, as shown in FIG. 11 described later, and is placed on the left and right ends of the outside air filter 45 by the filter locking portion 44. A provided locking portion (not shown) is locked. Mounting brackets 49 a and 49 b are provided on the left and right outer surface portions of the filter chamber portion 41.

  As shown in FIG. 5, the outside air duct 40 is fitted into the outside air duct mounting portion 34 of the inside air cover 30 with the outside air introduction port 46 facing the outside of the cab 10, and the outside air duct 40. The mounting brackets 49a and 49b are attached to the right wall plate 51. Then, the inside air cover 30 is covered from the front of the air conditioning unit 21 and attached to the floor plate 13 and the right side wall plate 51 of the cab 10. The outside air duct 40 and the inside air cover 30 may be integrated in advance and covered from the front of the air conditioning unit 21.

10 and 11 are a perspective view of the air conditioner 20 as viewed from the outside of the cab, and a YY arrow view of FIG. 10, respectively.
A mounting hole 55 and a vent hole 56 are formed in a portion of the right side wall 51 facing the air conditioning unit 21 and a portion facing the outside air inlet 46 of the outside air duct 40, respectively. The air conditioning unit 21 is inserted into the mounting hole 55 and a bracket having an L-shaped cross section from the outside on the right front side plate 51 in a state in which a part of the outer side of the case 21a protrudes outward from the right wall plate 51. It is attached with bolts 53 and 54 through 52. The attachment hole 55 has a size that allows the air conditioning unit 21 and the pipe connection portion on the side surface thereof to be pulled into the cab when the bracket 52 is removed from the outside of the cab room during maintenance.
An air intake cover 47 having a louver is attached to the right wall plate 51 with bolts 48 so as to cover the vent hole 56 from the outside. The vent hole 56 is formed to be positioned above the exterior cover 8 that covers a hydraulic oil tank, a fuel tank, and the like provided on the right side of the cab 10. When the intake cover 47 is removed, the outside air filter 45 of the outside air duct 40 can be detached from the outside air inlet 46.

Next, referring to FIGS. 4, 5, 7, and 11, the air intake and blowout paths by the air conditioner 20 will be described.
As shown in FIG. 5, the inside air is introduced into the heat exchange chamber 23 of the air conditioning unit 21 via the inside air introduction hole 35 of the inside air cover 30 and the inside air filter 38. As shown in FIG. 11, the outside air passes through the louver of the intake cover 47, the outside air filter 45 of the outside air duct 40, and the duct portion 42, and the outside air introduction chamber 27 and the heat exchange chamber 23 of the air conditioning unit 21. Introduced in. As shown in FIG. 4, the air conditioned in the heat exchange chamber 23 is blown from the blow holes 29 and 29, and passes through the introduction port 32 of the inside air cover 30 as shown in FIGS. 5 and 7. Then, the air is blown to the middle duct 31a, the upper duct 31b, and the lower duct 31c, and further blown out from the blowing members 39a, 39b, and 39c into the cabin of the cab 10.

  As shown in FIGS. 2 and 3, the air blown from the blowing member 39a is blown toward the front glass 14 of the cab 10, and the air blown from the blowing member 39b is blown toward the face of the operator. Air blown from the blowing member 39c is blown toward the operator's feet. The operator manually adjusts the wind direction of these blowing members 39a, 39b, 39c according to the posture at the time of operation.

  In addition, although the said embodiment demonstrated the structural example which attaches an air conditioning unit to the front part of the right side wall surface of a cab, you may install in the right side front part of a floor surface. In this case as well, in order to ensure visibility in the front right side, the upper part of the vehicle front side of the air conditioner (including the air conditioning unit and the air conditioning cover) may be configured to have a shape that is cut by a front-lowering inclined surface. . If the air conditioning unit is installed on the floor so as to fit in the opening on the right side wall surface, the air conditioning unit can be taken in and out of the cab and exposed to the outside of the cab. A pipe connection part can also be provided in a site | part. Furthermore, since it can also serve as a part of the right side wall surface, it is possible to secure a wide space in the cab.

Moreover, although it was set as the structure which blows off the air which blows off from an air conditioner on a front glass, you may provide a blower outlet in the center duct of an air-conditioning cover so that it may blow on at least any one of a front glass and a side glass.
Furthermore, although an example of an application machine of the present invention has been described with a backward ultra-small turning type hydraulic excavator, the present invention is not limited to this and can be applied to other hydraulic excavators.

With the above configuration, the present invention has the following effects.
Since the air conditioning unit is installed on the wall or floor on the right front of the cab, the distance from this air conditioning unit to the operator's feet and face, front and side window glass is close, and air distribution to these is very The duct to the blowout port for blowing air to the operator's foot and face, front and side window glass can be made very short, and in the best case, the duct can be eliminated. Therefore, since the duct laying space is small, a large living space in the cab can be secured. This also shortens the duct laying operation time and can reduce the production cost.

  At this time, by attaching the air conditioning unit to the front part of the right side wall surface of the cab, the amount of protrusion of the air conditioning unit to the inside of the cab becomes very small, so that a wider living space in the cab can be secured. .

  The air conditioning unit is attached so that it can be taken in and out from the inside and outside of the cab. In the above embodiment, the air conditioning unit is fitted into the opening of the right side wall surface from the inside or outside, and this air conditioning unit is attached to the right side wall surface with a bracket having an L-shaped cross section. Therefore, when removing the air conditioning unit, the bracket is removed. So that it can be pulled out from the inside or outside of the cab. For this reason, the air conditioning unit can be fitted into the opening on the right side wall surface from the outside when the vehicle is assembled, and it is difficult to take in and out from the outside during maintenance after assembly. As a result, assembly and maintenance can be improved.

  In addition, the air conditioning unit is fitted in the opening so that it also serves as a part of the right side wall surface, so the amount of protrusion of the air conditioning unit into the cab can be reduced, which increases the space in the cab. Can be secured. This also makes it possible to realize a structure that allows the air conditioning unit to be taken in and out from the inside and the outside with a simple configuration.

  Furthermore, since the pipe connection part is provided in the part of the air conditioning unit exposed to the outside of the cab, holes and connection parts for passing the pipe are not required on the floor surface and the wall surface, and the number of seal points is reduced and sealing becomes easy. At the same time, the number of gas leaks and water leaks is reduced and the reliability can be improved. In addition, since piping between the air conditioning unit and the engine, gas compressor, etc. can be directly performed in a substantially straight line, the piping path can be shortened and piping work is facilitated.

  In addition, an air conditioner (including an air conditioner unit and an air conditioner cover) is provided in the right front part of the cab, but the shape of this air conditioner is such that the upper part on the front side of the vehicle is cut with a downward slope. The field of view of the front right side of the vehicle from the operator is not obstructed by the air conditioner, and the right front view of the operator can be sufficiently secured. In the above embodiment, the shape of the air conditioning unit and the air conditioning cover are both configured as described above. However, the present invention is not limited to this. For example, only the air conditioning cover that covers the air conditioning unit may have the above shape. Alternatively, when the air conditioning cover is not covered, only the air conditioning unit may have the above shape. Further, conventionally, the air conditioner can be installed at the position on the right side of the cab where the air conditioner has not been installed because of fear of lowering the right front visibility, and the excellent effects described above can be obtained.

Furthermore, since the air conditioning cover (interior cover) that covers the air conditioning unit has a duct that distributes the air blown from the air conditioning unit, there is no need to install a new duct, saving the space for laying the duct. Can secure a large space in the cab. Moreover, since the air conditioning unit and the duct are hidden by this cover, the appearance can be improved.
Moreover, since the air-conditioning cover also includes outside air ducts for sucking outside air, it is not necessary to newly install these ducts, and a large space in the cab can be secured.

In addition, an introduction port for introducing outside air to the air conditioning unit was provided on the right side wall surface of the cab above the exterior cover. Since the vicinity of this inlet is located substantially in the center of the vehicle, the air introduced from this inlet is less susceptible to dust contamination and the temperature rise caused by warm air after engine cooling. Can be introduced. Thereby, the lifetime of the outdoor air filter can be improved, the air conditioning efficiency can be improved, and the like.
Furthermore, since the distance between the air conditioning unit and the introduction port for introducing outside air into the air conditioning unit is short, the outside air duct for sucking outside air becomes compact, and the air conditioning cover to which the outside air duct is attached can be made compact. , Space in the cab can be secured widely.

It is a side view of the hydraulic excavator which is an example of an application machine of the present invention. It is a side partial sectional view of the upper revolving unit of the hydraulic excavator. FIG. 3 is an XX arrow view of FIG. 2. It is a side view of an air-conditioning unit. It is a perspective view of an air-conditioning cover and an air-conditioning operation part. It is a perspective view of the cover for inside air seen from the inner side of the cab. It is a perspective view of the cover for inside air seen from the outer side of a cab. It is a perspective view of the duct for external air seen from the outer side of a cab. It is a perspective view of the duct for outside air seen from the inside of a cab. It is the perspective view which looked at the air conditioner from the cab outer side. It is a YY arrow line view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hydraulic excavator, 3a ... Swivel frame, 5 ... Working machine, 8 ... Exterior cover, 10 ... Cab, 14 ... Front glass, 20 ... Air conditioner, 21 ... Air conditioning unit, 30 ... Cover for inside air which is an interior cover, 31a ... a middle duct that is a duct, 51 ... a right side wall plate.

Claims (1)

A cab (10) is provided from the front central portion to the left end of the swing frame (3a), and a working machine (5) having a boom, an arm, a bucket, etc. at the front end of the swing frame (3a). In the air conditioner installed in the cab (10) of the excavator to which
At the front of the right side wall surface (51) of the cab (10), the air conditioning unit (21) is attached,
A duct (31a) for introducing air blown from the air conditioning unit (21 ) is integrally formed on the back surface of the interior cover (30) that covers the air conditioning unit (21) ,
The duct (31a) is provided with a blowing hole (33a) for blowing the air to the front glass (14) of the cab (10).

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