JPH06199125A - Air conditioner for construction machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the assemblability, simplify the filter replacement work, and improve the maintainability. [Structure] An outside air introducing portion 31 which is separate from the inside / outside air switching portion 26.
And the outside air introduction portion 31 is inserted from the outside into the attachment opening 30 formed in the rear side plate of the cab main body 23 and attached to the inside / outside air switching portion 26 and the outside air via the connection opening 29 and the connection pipe 31C. The air conditioner 24 was assembled by connecting to the inlet 31B. As a result, the inside / outside air switching unit 26 and the cab body 23 are separated from each other, and the air conditioner body 25 and the inside / outside air switching unit 26 can be installed on the floor plate 22 in advance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, a hydraulic excavator,
The present invention relates to an air conditioner for a construction machine provided in a driver's cab of a construction machine such as a hydraulic crane.

[0002]

2. Description of the Related Art FIGS. 3 to 5 show an example in which an air conditioner for a construction machine according to the prior art is provided in a hydraulic excavator.

In the drawing, 1 is an undercarriage, 2 is an upper revolving structure as a working machine main body mounted on the lower traveling structure 1 via a revolving device 3 so as to be revolvable. Includes a revolving frame 4 having a frame structure, a machine room 5 provided on the rear side of the revolving frame 4, and a counterweight 6 provided on the revolving frame 4 located on the rear side of the machine room 5, It is composed of a driver's cab 8 described later, which is located on the front side of the machine room 5 and provided on the revolving frame 4.

Reference numeral 7 denotes a working device provided in the front part of the upper swing body 2. The working device 7 includes a boom 7A, an arm 7B rotatably provided at the tip side of the boom 7A, and The boom 7B and the backhoe type bucket 7C rotatably provided on the tip side of the arm 7B.
A, the arm 7B, and the bucket 7C are operated by a boom cylinder 7D, an arm cylinder 7E, and a bucket cylinder 7F, respectively.

Reference numeral 8 denotes a driver's cab mounted on the revolving frame 4, and the driver's cab 8 is, as shown in FIG.
.. (only two of which are shown) through four buffer supports 9, 9, and a cab main body 11 provided above the floor plate 10 and formed as a cab box. The operator's cab main body 11 includes a floor board 10 through a connecting portion 11A protruding from the lower end side toward the inside.
Connected with. A driver's seat 12 on which a worker is seated, an operation lever device 13 for operating the work device 7 and the lower traveling structure 1, and an air conditioner 14 described later are provided in the cab 8.

Reference numeral 14 denotes an air conditioner provided in the driver's cab 8 at the rear side of the driver's seat 12, and the air conditioner 14 is
As shown in FIG. 5, an air conditioner main body 15 that blows adjusted air such as cold air and warm air into the cab 8 through a duct 15A extending upward, and a switching plate provided adjacent to the air conditioner main body 15. By the switching operation (not shown), the inside air inside the cab 8 and the outside air outside the cab 8 are selectively selected.
To the inside of the cab 8, an inside air inlet 17 formed in the inside and outside air switching portion 16 and an outside air inlet 18 formed in the rear side plate of the cab body 11.
And the cab 8 so as to cover the outside air inlet 18 from the inside.
The air conditioner main body 15 has a filter 19 that is provided inside and that removes dust in the outside air.
The upper side of the inside / outside air switching unit 16 is covered with a rear cover 20.

The air conditioner for a hydraulic excavator according to the prior art has the above-mentioned structure, and when an operator in the operator's cab 8 operates the air conditioner 14, the air conditioner 14 cools the air according to the operator's request. Warm the duct 1 of the air conditioner body 15
Air is blown into the cab 8 through 5A to cool and heat the cab 8.

[0008]

In the air conditioner for a hydraulic excavator according to the above-mentioned prior art, the outside air introduction port 18 is formed directly on the rear side plate of the cab body 11, and the outside air introduction port 18 and the inside / outside air switching unit are formed. 16 is connected via the filter 19, the cab main body 11 cannot be removed after the air conditioner 14 is attached to the floor plate 10.
In other words, the air conditioner 14 can be installed in the driver's cab 8 only after the driver's cab body 11 is mounted on the floor plate 10, and there is a problem that the assemblability of the air conditioner 14 is poor.

That is, according to the prior art, first, the air conditioner main body 15 is attached to the floor board 10, and then the cab body 11 is mounted and fixed on the upper side of the floor board 10, and then the volume in the narrow cab 8 is reduced. It is necessary to assemble the air conditioner 14 in two stages by bringing in the inside / outside air switching unit 16, the filter 19 and the like, which are large in size, and attaching it to the air conditioner main body 15. Therefore, work efficiency and assemblability are significantly reduced. There's a problem.

In particular, in the case of a small-sized hydraulic excavator, there is a problem that the assembling property of the air conditioner 14 is greatly reduced because the indoor space of the driver's cab 8, that is, the space for assembling the air conditioner 14 is small.

On the other hand, in the prior art, the rear cover 20 is provided to cover the upper sides of the air conditioner body 15 and the inside / outside air switching portion 16 in order to improve the appearance of the air conditioner 14, so the rear cover 20 must be removed. The filter 19 cannot be replaced.

Therefore, according to the above-mentioned conventional technique, when the filter 19 is clogged, the rear cover 20 is removed in a narrow space between the driver's seat 12 and the rear side plate of the cab body 11 to remove the filter 19. There is a problem that the air conditioner 14 has low maintainability because it must be replaced.

Further, since the maintainability is low, there is a problem that the replacement of the filter 19 by the operator is likely to be delayed, the introduction of outside air becomes difficult, and the air conditioning efficiency of the air conditioner 14 is significantly lowered.

Furthermore, in order to replace the filter 19 in a narrow space, dust adhering to the filter 19 is removed from the operator's cab 8.
It is easily scattered inside, and there is a risk that the inside of the cab 8 will be contaminated and the working environment will be reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and can be easily installed in the operator's cab to simplify the filter replacement work and improve the maintainability. The purpose is to provide.

[0016]

In order to solve the above-mentioned problems, an air conditioner for a construction machine adopted by the present invention has a structure of a working machine body, a working machine body, a driver's cab body, and a floor board. In a construction machine having a driver's cab, the air conditioner main body is provided in the driver's cab and blows regulated air, and the inside air inside the driver's cab and the outside air outside the driver's cab are provided in the air conditioner main body. An internal / external air switching portion that is supplied to the air conditioner main body, a connection port provided in the internal / external air switching portion, a mounting port provided in the operator cab body corresponding to the connection port, and the mounting port. An outside air introduction part attached to the outside of the cab main body, the base end side of which serves as an outside air introduction port that opens outside the cab body, and the tip end side of which is connected to the connection port, and an outside air introduction port of the outside air introduction part. Fill that is detachably provided so as to cover Characterized by being composed of a.

Further, it is preferable that a seal member for airtightly holding the tip side of the outside air introducing portion is provided at the connection port.

[0018]

When the air conditioner is assembled, after the air conditioner body and the inside / outside air switching section are provided on the floor plate, the outside air introducing section is attached to the attachment port from the outside of the cab body, and the tip end side of the outside air introducing section serves as the connection port. By inserting and connecting, the outside air introduction port of the outside air introduction unit and the inside / outside air switching unit are connected. Then, by the operation of the operator, adjusted air such as cool air and warm air is blown from the air conditioner main body into the operation room, and the operation room is cooled and heated.
Further, when the filter is clogged due to the intake of the outside air, the operator replaces the filter provided in the outside air introduction part with a new filter from the outside of the cab.

Further, if a seal member is provided at the connection port for airtightly holding the tip end side of the outside air introducing portion, the airtightness of the inside / outside air switching portion is maintained by the sealing member.

[0020]

Embodiments of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those of the conventional technique shown in FIGS. 3 to 5 are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 21 denotes a driver's cab of the hydraulic excavator applied to this embodiment. The driver's cab 21 is almost the same as the driver's cab 8 described in the prior art, and the buffer support 9, 9 is provided on the revolving frame 4. Floor plate 22 provided via 9, ...
Driver's cab main body 23 mounted on the upper part via a connecting portion 23A
, Etc., the rear side plate of the cab main body 23 is provided with a mounting port 30 described later.

Reference numeral 24 denotes an air conditioner according to this embodiment provided in the operator's cab 21, and the air conditioner 24 is similar to the air conditioner 14 described in the prior art, as shown in FIG.
An air conditioner main body 25 that blows adjusted air such as cold air and warm air through the duct 25A, and an air conditioner main body 25 that is provided adjacent to the air conditioner main body 25 and is operated by a switching operation of a switching plate (not shown). , An inside / outside air switching section 26 for selectively supplying outside air, and an inside / outside air switching section 26 opened in the cab 21.
The air-conditioner body 25 and the inside / outside air switching section 26 are covered with a rear cover 28. It is being appreciated.

However, the air conditioner 24 according to this embodiment is
A connection port 29 is formed on the rear side of the inside / outside air switching unit 26, and is connected to the separately formed outside air introduction unit 31 via the connection port 29, which is different from the air conditioner 14 according to the related art.

Reference numeral 30 corresponds to the connection port 29, and the operator cab main body 2
3 is a mounting port formed in the rear side plate of the rear plate 3, and 31 is the mounting port 30
In the figure, the outside air introducing portions installed by being inserted from the outside (machine room 5 side) of the operator's cab body 23 are respectively shown.
1 is a filter box 31A formed outside the cab body 23 and formed in a rectangular shape, and the filter box 3A.
Outside air inlet 31B formed by communicating the inside of 1A with the outside
And a connecting pipe 31C that extends from the filter box 31A into the cab main body 23 and has its tip end side inserted into and connected to the connection port 29.

The outside air introducing portion 31 is installed from the outside of the cab body 23 from the outside of the cab body 23 when the air conditioner 24 is assembled.
By being inserted into the inside and being pushed in until the filter box 31A comes into contact with the rear side plate of the cab main body 23,
The tip end side of the connection pipe 31C is inserted into the connection port 29 to be connected, and in this state, it is detachably attached to the cab main body 23 by a plurality of bolts 32, 32, ... (Only two are shown). The air outside 21 is supplied to the air conditioner body 25 through the inside / outside air switching unit 26.

Reference numeral 33 denotes an outside air introducing port 31B of the outside air introducing portion 31.
The filter provided detachably in the filter box 31A so as to cover the inside of the filter box 31A.
The reference numeral 3 is adapted to be attached and detached from a direction perpendicular to the paper surface of FIG.

Reference numeral 34 denotes a seal member provided on the inner peripheral side of the connection port 29 and formed in a tubular shape from an airtight elastic material such as rubber. The seal member 34 has an inner diameter dimension outside air introduction portion 31. The diameter of the connecting pipe 31C is slightly smaller than the outer size of the connecting pipe 31C. When the connecting pipe 31C of the outside air introducing portion 31 is inserted into the connecting port 29, the sealing member 34 elastically deforms and comes into close contact with the outer peripheral side of the connecting pipe 31C, whereby the air inside the inside / outside air switching portion 26 is closed. Is prevented from leaking into the cab 21.

The air conditioner for a hydraulic excavator according to the present embodiment has the above-described structure. First, the air conditioner body 25 and the inside / outside air switching unit 26 are installed on the floor plate 22,
When the cab main body 23 is mounted on the floor plate 22 from above,
The axes of the connection port 29 and the mounting port 30 substantially coincide with each other. Next, the connection pipe 31C of the outside air introducing portion 31 is inserted into the attachment port 30 from the outside of the cab body 23, and the outside air is introduced until the filter box 31A of the outside air introducing portion 31 contacts the rear side plate of the cab body 23. When the portion 31 is pushed in, the distal end side of the connection pipe 31C elastically deforms the seal member 34 and the connection port 29C.
The air enters into the inside and is airtightly connected, so that the outside air introduction port 31B of the outside air introduction portion 31 and the inside / outside air switching portion 26 are connected. Finally, the outside air introducing portion 31 is fixed to the rear side plate of the cab main body 23 via the bolts 32, 32, ... Thus, the air conditioner 24 is completed.

The hydraulic shovel air conditioner according to the present embodiment is assembled in this manner, and the basic operation thereof is not different from that of the prior art.

However, in this embodiment, the outside air is supplied to the inside / outside air switching portion 26, which is separate from the outside air introducing portion 31, via the outside air introducing portion 31 mounted from the outside of the cab body 23. The inside / outside air switching unit 26 that connects the outside air introduction port 31B of the outside air introduction unit 31 and the air conditioner body 25 can be physically separated from the cab body 23.

As a result, the air conditioner main body 25 and the inside / outside air switching unit 26 can be installed on the floor plate 22 before the driver's cab main body 23 is mounted on the floor plate 22. Air conditioner body 25 with a large
The inside / outside air switching unit 26 can be assembled, and finally, the air conditioner 24 can be easily assembled only by inserting and attaching the outside air introducing unit 31 from the outside of the operator's cab body 23. Assemblability is greatly improved.

Further, since the filter 33 is detachably provided in the filter box 31A of the outside air introduction portion 31 located outside the operator's cab 21, the filter 33 is provided outside the operator's cab main body 23 without removing the rear cover 28. Can be easily replaced, the replacement work can be simplified, and the maintainability can be greatly improved. As a result, the replacement of the filter 33 can be effectively prevented from being delayed, and the air conditioning efficiency of the air conditioner 24 can be maintained.
It is possible to prevent dust from scattering into the cab 21 during the replacement, and to obtain a comfortable working environment.

Furthermore, since the seal member 34 made of an airtight elastic material is provided on the inner peripheral side of the connection port 29,
Even if the formation positions of the connection ports 29 and the mounting ports 30 and the dimensions of the connection pipe 31C of the outside air introduction part 31 are slightly changed, the seal member 34 is closely attached to the periphery of the connection pipe 31C and the inside / outside air switching part 26 is airtight. It can retain sex.

In the above-mentioned embodiment, the case of using it in a hydraulic excavator has been described as an example, but it can also be used in other construction machines such as a hydraulic crane.

[0035]

As described in detail above, according to the present invention, in the construction machine including the working machine main body and the operator's cab provided on the working machine main body and including the operator's cab main body and the floor board, An air conditioner main body that is provided indoors and blows regulated air, and an inside / outside air switching unit that is provided in the air conditioner main body and selectively supplies the inside air inside the operating room and the outside air outside the operating room to the air conditioning device main body, A connection port provided in the inside / outside air switching unit, a mounting port provided in the driver's cab main body corresponding to the connection port, and attached to the mounting port from the outside of the driver's cab main body,
A base end side is an outside air introduction port that opens outside the cab body, and a distal end side is an outside air introduction part connected to the connection port, and a filter detachably provided so as to cover the outside air introduction port of the outside air introduction part. With this configuration, the inside / outside air switching unit that connects the air conditioner body and the outside air introduction port can be physically separated from the cab body.

As a result, before the driver's cab body is mounted on the floor plate, the air conditioner body and the inside / outside air switching unit can be installed on the floor plate, and finally the outside air introduction unit is inserted from the outside of the driver's cab body and mounted. Since the air conditioner can be assembled by means of the above, the air conditioner main body and the inside / outside air switching unit having a large volume can be assembled in a large work space, and the work efficiency and the assemblability can be improved. Further, since the outside air inlet is provided outside the driver's cab main body and the filter is detachably attached to the outside air inlet, the filter can be easily replaced outside the operator's cab, simplifying the replacement work and improving maintainability. Can be improved.

Further, since the connecting port is provided with the seal member for airtightly holding the front end side of the outside air introducing portion, even if the forming position or the size of the connecting port or the mounting port is slightly changed, the sealing member The airtightness of the inside / outside air switching section is maintained by closely adhering to the tip side of the outside air introduction section.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an air conditioner for a construction machine according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part in FIG.

FIG. 3 is a side view showing a hydraulic excavator on which an air conditioner for a construction machine according to a conventional technique is mounted.

FIG. 4 is a vertical sectional view showing an air conditioner for a construction machine according to a conventional technique.

5 is a perspective view showing a main part in FIG. 4 with a rear cover removed. FIG.

[Explanation of symbols]

 2 Upper revolving structure (work machine main body) 21 Driver's cab 22 Floor board 23 Driver's cab main body 24 Air conditioner 25 Air conditioner main body 26 Inside / outside air switching unit 29 Connection port 30 Mounting port 31 Outside air introduction unit 31A Filter box 31B Outside air introduction port 31C Connection pipe 33 filter 34 sealing member

Claims (2)

[Claims] 1. A construction machine comprising a working machine main body and a driver's cab provided on the working machine main body and comprising a driver's cab main body and a floorboard, and an air conditioner provided in the operator's cab for sending adjusted air. A main body, an inside / outside air switching section provided in the main body of the air conditioner for selectively supplying the inside air inside the driver's cabin and the outside air outside the driver's cabin to the main body of the air conditioner, and a connection port provided in the inside / outside air switching section A mounting port provided in the cab body corresponding to the connection port, and an outside air introduction port that is mounted to the mounting port from the outside of the cab body and has a base end side that opens outside the cab body. An air conditioner for a construction machine, comprising: an outside air introduction portion whose tip side is connected to the connection port; and a filter detachably provided so as to cover the outside air introduction port of the outside air introduction portion. 2. The air conditioner for a construction machine according to claim 1, wherein the connection port is provided with a seal member that airtightly holds the front end side of the outside air introduction portion.