JPH11310937A - Cooling device for back hoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently cool an operating portion without hindrance of a cooler unit or the like against operator's eye by positioning the cold air outlet of a cooler unit installed inside a roof of the operating portion, at the upper part of the operating portion and providing a filter supplying the outside air to the cooler unit at the outside of the roof. SOLUTION: A cooler unit (a) provided with an evaporator and an expansion valve is installed inside a roof 12 of an operating portion 5 and an air outlet 13 supplying cold air from the cooler unit (a) to the operating portion 5 is positioned at the upper part of the operation portion 5. A cooler filter 31 for supplying the outside air to the cooler unit (a) is installed at the outside of the roof 12. In this way, the cooler unit or the like does not obstructs operator's eye and hence, the operating portion can be efficiently cooled and further, the evaporator, an air blower, and an expansion valve for the cooler unit (a) can be disposed at the rear side of the roof 12, as compared with a structure in which a filter for a cooler is disposed inside the roof 12, and hence, the clearance between an operator in the operating portion and the roof 12 can be made wider.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a backhoe, and more particularly, to a cooling device for supplying cold air in a spot manner while the excavation work device is easily controlled.

[0002]

2. Description of the Related Art As a spot cooler of a working machine, a spot cooler disclosed in Japanese Utility Model Laid-Open No. 6-50915 and a tractor disclosed in Japanese Patent Laid-Open No. 7-47832 are known. But there was no backhoe.

[0003]

Therefore, it has been studied to equip a backhoe with a cooling device for reasons such as obtaining a comfortable habitability and differentiating the product. In the backhoe, it is important to arrange each equipment so as not to disturb the driver's eyes, because the bucket position is excavated in multiple directions, front and rear and up and down and left and right. It is another object of the present invention to provide a cooling device suitable for a backhoe in which a cooler unit or the like can efficiently cool without hindering a driver's eyes in excavation work.

[0004]

The technical means of the present invention for solving this technical problem includes an evaporator 17 and an expansion valve 1.
9 is provided inside the roof 12 with respect to the operating unit 5, and an outlet 13 for supplying cool air generated by the cooler unit a toward the operating unit 5 is provided at an upper part of the operating unit 5, The point is that a cooler filter 31 for supplying outside air to the cooler unit a is provided outside the roof 12.

Therefore, since the cooler unit a is disposed inside the roof 12 with respect to the operating unit 5, the outlet 13 for supplying cool air toward the operating unit 5 and the cooler unit a are close to each other, and the efficiency is improved. Cooling can be performed, and the arrangement of the cooler unit a inside the roof 12 prevents the cooler unit a from obstructing the operator's eyes during excavation work.

Further, since the cooler filter 31 for supplying the outside air to the cooler unit a is provided outside the roof 12, the cooler unit is compared with the cooler filter arranged inside the roof 12. evaporator 1
7. The blower 18 and the expansion valve 19 can be arranged on the rear side of the roof 12, and the rear side of the roof 12 is projected downward, so that the clearance between the operator of the driving unit 5 and the roof 12 is increased. It can be made wider and it is possible to obtain more comfortable livability.

The technical means of the present invention resides in that the cooler filter 31 is provided below the column 11 for supporting the roof 12. Therefore, it is not necessary to dispose the cooler filter 31 inside the roof 12, and the cooler filter 31 does not obstruct the operator's eyes during excavation work.

The technical means of the present invention resides in that the cooler filter 31 is provided between a pair of right and left columns 11 for supporting the roof 12. Therefore, it is not necessary to dispose the cooler filter 31 inside the roof 12, and the cooler filter 31 does not obstruct the operator's eyes during excavation work.

Further, the technical means of the present invention is that a ventilation path for supplying the outside air sucked through the cooler filter 31 to the cooler unit a is formed in the support column 11. Therefore, the pillar 11 supporting the roof 12
Can be effectively used as a ventilation path for supplying the outside air sucked in through the cooler filter 31 to the cooler unit a side, there is no need to provide a special ventilation path, and members can be economically saved. It is.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a backhoe, 1 is a crawler traveling device, 2 is a digging work device, 3 is a swivel, 4 is a canopy, 5 is an operation unit, and 6 is a driving unit (engine room). The driving unit 6 is configured as a small rear turning type including three bonnets: a tank bonnet 7 on the right side of the driver's seat 10, a rear bonnet 8, and an auxiliary machine bonnet 9 on the left side. The small rear turning type is a structure in which the turning center X is set so that only the turning radius at the rear part of the turning table 3 falls within the machine width (the left and right crawler widths).

The canopy 4 is composed of a pair of right and left columns 11 rising from the prime mover 6 and a roof 12 for mud and sunshades. The strut 11 has a shape in which the upper portion is bent slightly forward, and on the inner surface side of the roof 12,
A cooler unit a in a cooling device A, which will be described later, and an outlet 13 in a state where cool air blows downward are arranged. Next, the cooling device A will be described.

As shown in FIG. 3 to FIG.
A compressor 14, a condenser 15, a liquid receiver 16, and the like are provided in a driving unit 6 which is an engine room, and an evaporator 17, a blower 1
8. The cooler unit a having the expansion valve 19
It is configured as a vapor compression type, which is disposed at the inner rear with a slight downward inclination and provided with an air outlet 13 for supplying the cool air generated in the cooler unit a to the operation unit 5.

Although the liquid receiver 16 is provided with a desiccant, a configuration in which a dryer is provided between the liquid receiver 16 without a desiccant and the expansion valve 19 may be used. The compressor 14 is driven by power from the engine E and compresses a gaseous refrigerant. The condenser 15 is disposed so as to be blown and cooled by the cooling fan 21 of the radiator 20.
It is located near.

Also, a compressor 14, a condenser 15, a liquid receiver 16
A pair of back and forth refrigerant supply / discharge hoses 22 and 23 circulating between the cooler unit a and the like penetrate the upper surface of the bonnet 8, pass through the inside of the right support 11, or are arranged along the right support 11 to cooler Connected to unit a. As shown in FIGS. 4 and 5, the cooler unit a arranged on the roof 12 includes a pair of left and right outlets 13, a forked cold air duct 25, an evaporator 17, and a pair of left and right blowers 18 in this order from the front. It is arranged towards the back. The blower 18 and the expansion valve 19 are arranged at the rear end inside the roof 12, and the evaporator 17 is arranged slightly behind the rear end. A space between the start end of the cool air duct 25 and the blower 18 is covered with a cover 26 surrounding the evaporator 17. A heat insulating material (insulator) 27 such as styrene foam is stretched on the inner surface of the roof 12, and a roof cover 28 that covers the heat insulating material 27 and the cooler unit a is provided as an interior material.

A cooler filter 31 for supplying outside air to the cooler unit a is provided with a support 1 outside the roof 12.
1, a ventilation path is provided in the column 11 so as to be located between the pair of left and right columns 11 and to supply outside air sucked in through the cooler filter 31 to the cooler unit a side. I have. The cooler filter a is communicated with a pair of left and right columns 11 via a pair of connecting tubes 32, and the pair of right and left columns 11 is communicated with the inside of the roof cover 28 via a pair of connecting tubes 33.

Accordingly, the outside air sucked by the cooler filter 31 passes through the pair of connecting pipes 32 and the pair of right and left columns 11.
Outside air is passed through the pair of connecting pipes 33 from the column 11, and the outside air taken in from the columns is drawn into the pair of blowers 18 through the inside of the roof cover 28. Then, the air blown by the blower 18 is cooled by the evaporator 17 to become cool air, and is blown from the blower 13 to the operation unit 5 through the cool air duct 25. The cool air duct 25 is shaped to branch into a left cool air passage 25a communicating with the left blow air outlet 13 and a right cool air passage 25b communicating with the right outlet air blow 13. The left and right cool air passages 25a and 25b It is arranged close to the lateral end along the left and right ends.

In the space surrounded by the roof cover 28 and the heat insulating material 27, a cool air duct to the cover of the evaporator 17 and the air outlet 13 is formed so that the cool air duct 25, the cover 26, or both of them. May be omitted. As shown in FIG. 4, the evaporator 17 and the blower 18 integrated by the cover 26 are arranged in a rearwardly inclined state in which the rear portion is lowered, and water generated by a temperature drop at the evaporator 17 site becomes a drop. And fall on the cover 26,
The cover 26 is configured to collect on a drain 26a provided on the rear right side of the cover 26. A drain hose 30 is connected to the drain 26 a, and the drain hose 30 is connected to the hole 11 of the right support 11.
It is arranged inside the swivel 3 through the inside of the right support column 11 through b, and is discharged out of the machine from there.

The shape of the roof cover 28 is the left and right
The left and right portions of the three portions and the left and right portions of the pair of left and right duct portions 25a and 25b in the cold air duct 25 are set to be lifted upward, that is, the ceiling is set to be high in that portion. When the bucket 2a is operated at a high position, the operator seated on the driver's seat 10 can easily look upward and forward.

As shown by phantom lines in FIG. 5, if a window 32A is provided between the left and right cold air passages 25a and 25b so that the driver 5 can view the upper part of the roof 12, the bucket raised high. 2a can be seen through the roof 12, making it easier to maneuver, which is preferable. The roof 12
Are mounted and supported by bolts or the like on a roof frame 24 formed over the left and right columns 11.

FIG. 8 shows another embodiment, in which a cooler unit a disposed on a roof 12 is provided with three outlets 13 at both ends in the left-right direction and a center part in the left-right direction. Are formed so as to be divided into three corresponding to the three outlets 13, and the evaporator 17 to the pair of left and right blowers 18
Is guided to the three air outlets 13. A first shutter 41 and a second shutter 42 are provided in the cool air duct 25, and by switching between the first shutter 41 and the second shutter 42, the cool air from the evaporator 17 is supplied to the central portion of the three outlets 13. A first switching position in which only the air outlets 13 are blown, and air outlets 1 at both ends in the left-right direction of the three air outlets 13 for supplying the cool air from the evaporator 17.
It is configured to switch to a second switching position where air is blown only to the third switching position. That is, the shutter switching wire 43
For example, by pulling the first shutter 41 and the second shutter 42 around the fulcrums 45 and 46,
The outlets 13 at both ends in the left-right direction are closed by the first shutter 41 and the second shutter 42, and the shutter switching wire 43 is pressed, for example, to rotate the first shutter 41 and the second shutter 42 around the fulcrums 45 and 46. Let me move
The air outlet 13 at the center in the left-right direction is configured to be closed by the first shutter 41 and the second shutter 42.

Therefore, normally, the outlets 1 at both ends in the left-right direction.
The operator can receive the cool air from the position 3, but if the operator wants to receive the cool air quickly, the operator can easily switch the first shutter 41 and the second shutter 42 by the push / pull operation of the shutter switching wire 43, and move the first shutter 41 and the second shutter 42 at the center in the left-right direction. Cold air can be received from the three outlets 13. FIG. 9 shows a structure of a canopy portion as a comparative example with the present invention. As shown in FIG.
As in the case of the above embodiment, a pair of left and right outlets 1
3. The bifurcated cold air duct 25, the evaporator 17, and a pair of left and right blowers 18 are arranged in this order from the front to the rear, and the space between the start end side of the cool air duct 25 and the blower 18 is:
It is covered with a cover 26 surrounding the evaporator 17.
A heat insulating material (insulator) 27 such as styrene foam is stretched on the inner surface of the roof 12, and a roof cover 28 that covers the heat insulating material 27 and the cooler unit a is provided as an interior material.

At the rear end of the roof cover 28, a pair of left and right filters 29 for introducing outside air are arranged.
The outside air taken in from here is sucked into the blower 18 through the inside of the roof cover 28, and the blown air of the blower 18 is cooled by the evaporator 17 to become cool air, and is blown out from the blower 13 to the operation unit 5 through the cool air duct 25. It has become.

The evaporator 17 and the blower 18 integrated by the cover 26 are arranged in a downwardly inclined state in which the rear part is lowered, and water generated by a temperature drop at the evaporator 17 becomes a drop to form the cover 26. When it falls upward, it is configured to gather at a drain 26a provided at the rear right of the cover 26. A drain hose 30 is connected to the drain 26a. The drain hose 30 is routed inside the swivel 3 through, for example, the inside of the right support column 11, and is discharged outside the machine.

Therefore, in this case, since the pair of left and right outside air introduction filters 29 is located at the rear end of the roof cover 28,
As a result, it becomes necessary to dispose the blower 18 and the evaporator 17 on the front side of the roof cover 28, so that the front side of the roof cover 28 projects downward as compared with the case of the embodiment shown in FIG. In addition, the clearance between the roof of the operator sitting on the driver's seat 10 and the roof cover 28 is reduced, which causes a problem that the habitability deteriorates. That is, in the case of the above-described embodiment shown in FIG.
Protrudes downward, so that a larger clearance is generated between the head of the operator sitting on the driver's seat 10 and the roof cover 28 than in the case of FIG. become.

[0025]

According to the present invention, the air outlet 13 for supplying the cool air to the operation unit 5 and the cooler unit a are in a state close to each other, and the cooling can be performed efficiently. Cooler unit a
Is not in the way of the operator's eyes during excavation work. Further, since the cooler filter 31 for supplying outside air to the cooler unit a is provided outside the roof 12,
The clearance between the operator of the driving unit 5 and the roof 12 can be made larger than that in which the cooler filter is arranged inside the roof 12, so that a comfortable livability can be obtained. Become.

[Brief description of the drawings]

FIG. 1 is a side view of a backhoe.

FIG. 2 is a plan view of a backhoe.

FIG. 3 is a rear view of the backhoe.

FIG. 4 is a vertical sectional side view showing a structure of a canopy portion.

FIG. 5 is a plan view showing an arrangement structure of a cooling device in a canopy.

FIG. 6 is a sectional view of a duct portion.

FIG. 7 is a system diagram showing a structure of a cooling device.

FIG. 8 is a configuration diagram illustrating an arrangement structure of a cooling device according to another embodiment.

FIG. 9 is a longitudinal sectional side view of a canopy portion showing a comparative example with the present invention.

[Explanation of symbols]

 Reference Signs List 5 operation part 11 prop 12 roof 13 outlet 17 evaporator 19 expansion valve 31 cooler filter a cooler unit

Claims (4)

[Claims] A cooler unit (a) provided with an evaporator (17) and an expansion valve (19) is provided inside a roof (12) with respect to an operation unit (5), and cool air generated in the cooler unit (a) is provided. Outlet (1) for supplying air to the operation unit (5).
A cooler filter (3) is provided above the operating section (5) to supply outside air to the cooler unit (a).
Backhoe cooling device characterized in that 1) is provided outside the roof (12). 2. The backhoe cooling device according to claim 1, wherein the cooler filter (31) is provided at a lower portion of a column (11) supporting a roof (12). 3. The backhoe cooling device according to claim 1, wherein the cooler filter (31) is provided between a pair of right and left columns (11) supporting the roof (12). 4. An air passage for supplying outside air drawn through the cooler filter (31) to the cooler unit (a) side is formed in the column (11). The cooling device for a backhoe according to any one of claims 1 to 3.