JPH11343636A - Cooler for backhoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration in an appearance due to exposure of a condenser and the like of a cooler or in a field of view of a worker and to cool down an apparatus inside a bonnet in a cooler for a backhoe. SOLUTION: A working fluid tank 15 and a control valve 16 are adjacently arranged in a bonnet 12 of a backhoe, a cooler condenser 25 and a cooling fan 27 are arranged in the bonnet 12 above the working fluid tank 15 and the control valve 16, and exhaust air passing through the cooler condenser 25 is blown toward the working fluid tank 15 and the control valve 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backhoe cooling device.

[0002]

2. Description of the Related Art In a conventional backhoe cooling device, a cooler unit having an evaporator, an expansion valve, an air supply fan and the like is provided in a cabin, while an outdoor unit such as a condenser (condenser) and a cooling fan is provided outside the cabin. On the hood or inside the hood.

[0003]

When the outdoor unit is arranged on the hood of the swivel base or the like as described above, it is possible to prevent inconveniences such as impairing the space in the cabin and increasing the overall height of the cabin. However, there has been a problem that not only the condenser and the like are exposed to the outside and the appearance is impaired, but also the visibility of the driver is obstructed and the workability is impaired.

[0004] Also, even when placed in a hood,
In some cases, exhaust air from a condenser may be blown to a cooling device such as a radiator, which may deteriorate the cooling efficiency of an engine or the like. Therefore, the present invention
By arranging a cooler condenser etc. in the bonnet so as not to impair the worker's view, do not blow the exhaust air from the condenser to the cooling device inside the bonnet. It is an object of the present invention to provide a cooling device for a backhoe that makes it possible to cool equipment in a hood by utilizing the same.

[0005]

The present invention employs the following technical means to achieve the above object. That is,
In the backhoe cooling device according to the present invention, the cooler condenser and a fan for cooling the condenser are arranged in the bonnet so as to blow exhaust air passing through the cooler condenser against high-temperature equipment in the hood. It is characterized by having.

[0006] According to this, the cooler condenser and the fan are arranged in the bonnet to prevent them from obstructing the field of view of the operator, and the exhaust air is blown to the high-temperature equipment in the bonnet. Thus, a cooling effect can be expected. Here, high-temperature equipment refers to equipment that has a higher temperature than the exhaust air from the condenser.For example, oil is cooled by blowing exhaust air to a hydraulic oil tank, control valve, etc. disposed in the bonnet. As a result, good flow performance can be obtained, and the operation of the backhoe becomes smooth.

In this case, if the hydraulic oil tank and the control valve are arranged adjacent to each other in the bonnet and the exhaust air from the condenser is blown at least to the hydraulic oil tank, the oil can be efficiently cooled. In addition, by disposing the cooler condenser and the fan above the hydraulic oil tank and the control valve, the exhaust air having a lower temperature than the hydraulic oil tank and the like flows downward, thereby further improving the cooling efficiency.

It is preferable that an air inlet for sending outside air to the cooler condenser is formed in the bonnet, whereby the condenser can be efficiently cooled even in the bonnet in a high temperature state, thereby impairing the function as a cooling device. Disappears. In addition, the cooler unit having the evaporator is preferably disposed on a roof of a cabin or a canopy that covers an upper part of a driver's seat provided on a swivel base.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, a backhoe 1 is provided with a turntable 3 on a crawler traveling device 2 so as to be rotatable around an up-down axis, and an excavator 4 at a front portion of the turntable 3. A driving unit 7 having a driver's seat 5 and a cabin 6 surrounding the driver's seat 5 is mainly provided on 3.

The backhoe 1 according to the present embodiment is provided with a vertical fulcrum of the excavator 4 on the side of the operating unit 7, and the turning trajectory of the swivel 3 is set within the front-rear and left-right widths of the crawler traveling device 2. It is a so-called ultra-small swiveling type. A hood 1 forming an engine room is provided on the swivel 3.
1 and 12 are provided, and the hood is
It comprises a rear bonnet 11 covering the engine 13 and the radiator 14 disposed at the rear, and a side bonnet 12 covering the hydraulic oil tank 15 and the control valve 16 disposed at the right front side of the swivel 3. ing.

The driver's seat 5, operation lever 17 and the like are disposed on the left front side of the swivel 3 and the cabin 6 is disposed so as to cover them. A mounting portion 18 of the excavator 4 is disposed between the cabin 6 and the side bonnet 12 on the left and right sides. As shown in FIG. 4, the mounting portion 18 includes a pair of left and right brackets 18a and 18b made of plate members opposed to each other at a predetermined interval in the left and right direction. Is erected on the base frame 3a constituting the bottom of the base. Then, the excavator 4 is disposed between the pair of brackets 18a and 18b.
The lower end of the boom 4a is pivotally supported, and the lower end of the boom cylinder 4b is pivotally supported forward of this pivot point.

The hydraulic oil tank 15 is disposed on the base frame 3a on the right side of the right bracket 18a constituting the excavating work machine mounting portion 18, and the control valve 16 is connected to the excavating work machine 4, A valve unit in which a number of control valves for controlling each hydraulic device for driving the table 3, the crawler traveling device 2 and the like are arranged in a vertical direction, and a right bracket is provided adjacent to the front side of the hydraulic oil tank 15. The support member 19 is attached to a wall surface 18a.

The backhoe 1 according to the present invention is provided with a cooling device 8 for cooling the cabin 6. As shown in FIG. 5, the cooling device 8 includes a cooler unit 9 having an evaporator 21, a blower 22, an expansion valve 23, and the like inside a roof 6 a of a cabin 6 and a compressor 2.
4. Cooler condenser (condenser) 25, cooling fan 27, liquid receiver 26, etc. are provided in bonnets 11 and 12, and the air blower 22 from cooler unit 9 is cooled by evaporator 17 to become cool air. , This cold air is blown into cabin 6
It is configured to supply the air into the cabin chamber from an air outlet formed at an appropriate place such as the lower surface of the roof.

The compressor 24 is driven by power from the engine 13 or by an electric motor or the like, and compresses a gaseous refrigerant. The compressed refrigerant is sent to the condenser 25 and is blown and cooled by the fan 27.
The liquid receiver 26 is provided at a position near the condenser 25 or at an appropriate position in the bonnet. Cooler unit 9,
A pair of back-and-forth cooling supply / discharge hoses 28a and 28b circulating between the compressor 24 and the liquid receiver 26 pass from inside the bonnet to the inside of the support column 6b and the like of the cabin 6 and the cooler unit in the roof 6a. 9 is allocated.

The condenser 25 for cooling and the fan 27 are an integrated unit 32 which is disposed in the side hood 12 and above the hydraulic oil tank 15 and the control valve 16. Is supported via a mounting member 29 to a right bracket 18a constituting the mounting portion 18. The hydraulic oil tank 1
An opening 30 is formed in the upper surface of the side bonnet 12 above the control valve 16 and the control valve 16.
Is opened and closed by a cover body 31,
At a portion of the cover body 31 facing the condenser 25 and the fan 27, an intake port 33 communicating with the inside and outside of the hood 12 is formed. And the intake port 33
The outside air is taken in from the
The exhaust gas having passed through the condenser 25 is discharged downward, and is blown to the hydraulic oil tank 15 and the control valve 16.

A flow guide plate 34 for guiding outside air is provided between the intake port 33 and the cooler condenser 25 (fan 27). The air is blown to the cooling device 25 so that cooling can be performed efficiently. Capacitor 2 as above
The exhaust air passing through 5 becomes approximately 50 ° C. to 60 ° C. due to the heat of condensation, while the operating oil tank 15 and the control valve 16 become hotter than the exhaust air. In particular, the temperature of the hydraulic oil tank 15 may rise to about 80 ° C. to nearly 100 ° C. Therefore, the exhaust air from the cooler condenser 25 is blown to the hydraulic oil tank 15 and the control valve 16 so that they can be cooled.

Since the condenser 25 and the fan 27 are disposed in the side bonnet 12, they are not exposed to the outside so as not to impair the appearance and impair the driver's view. In a plan view shown in FIG. 2, a roof 6 of a cabin 6 provided on one of the left and right sides of the swivel 3.
a), the condenser 25 and the fan 27 are disposed in the bonnet 12 on the other side of the left and right sides of the turning axis X, thereby impairing the left-right weight balance of the backhoe 1 as a whole. There is no.

In the above description, the exhaust air from the condenser 25 may be blown only to the hydraulic oil tank 15, which becomes particularly hot. Although the condenser 25 and the fan 27 are shown as an integrated unit,
These may be separately arranged vertically, and the upper and lower positions of the condenser 25 and the fan 27 may be of a spray type in which the fan 27 is disposed above the condenser and blows cool air. The fan 27 may be a suction type in which the fan 27 is provided below the condenser.

The mounting member 29 for supporting the unit 32 such as a condenser is provided with a vent or a notch through which the exhaust air from the condenser 25 passes. In addition, the condenser 25 and the fan 27 can be supported by a bracket or the like directly erected from the base frame 3a, or can be supported from the hydraulic oil tank 15 via a support member or the like.

In the cooling device 8 according to the present invention, not only a backhoe having a cabin specification as described above, but also a backhoe having a canopy in the operation unit 7 and a cooler unit on the roof thereof. Applicable.
6 to 8 show an example in which a spot-type cooler unit 9 is provided for the canopy 37.
Is provided with a roof 37a on a pair of left and right columns 37L and 37R, and the cooler unit 9 includes a pair of left and right outlets 38, a forked duct 39, an evaporator 21, and a pair of left and right blowers 22 in this order. And a space between the start end of the cool air duct 39 and the blower 22 is covered with a cover 40 surrounding the evaporator 21. A heat insulating material (insulator) 41 such as styrene foam is provided on the inner surface of the roof 37a.
A roof cover 42 that covers the air conditioner 1 and the cooler unit 9 is provided as an interior material.

At the rear end of the roof cover 42, a pair of left and right filters 43 for introducing outside air are laid sideways, and the outside air taken in from there is drawn into the pair of blowers 22 through the inside of the roof cover 42. is there. Then, the air blown by the blower 22 is cooled by the evaporator 21 to become cool air, and is blown directly from the air outlet 38 to the operator of the driver's seat 5 through the cool air duct 39. Cold air duct 39
Are branched into a left cool air passage 39L communicating with the left outlet 38L and a right cool air passage 39R communicating with the right outlet 38R.
Are arranged near the lateral end along the left and right ends of the roof 37a.

In the space surrounded by the roof cover 42 and the heat insulating material 41, the cool air duct 39 to the cover 40 and the air outlet 38 of the evaporator 21 is formed so that the cool air duct 39, the cover 40, or the like. A structure in which both are omitted may be adopted. The evaporator 21 and the blower 22 integrated by the cover 40 are arranged in a downwardly inclined state in which the rear portion is lowered, and water generated by a temperature drop in the evaporator 21 becomes a drop and is formed on the cover 40. When falling, cover 40
It is configured to collect on a drain 40a provided on the rear right side of the rear panel. A drain hose 45 is connected to the drain 40a. The drain hose 45 is routed inside the swivel 3 through the inside of the right column 37R through the hole of the right column 37R, and is discharged outside the machine from there. It has become so.

The shape of the roof cover 42 is such that the left and right outlets 3
The left and right sides of the eight sections and the left and right sides of the pair of left and right duct portions 39L and 39R in the cold air duct 39 are set to be lifted upward, that is, the ceiling is set to be high in that part, and a bucket for slope excavation is provided. When the driver is working at a high position, the operator seated on the driver's seat 5 can easily see upward and forward.

In the case of the above-mentioned canopy specification, the support 3
7L and 37R are provided as a pair of right and left, but may be supported by a pair of front and rear columns on one side of the roof. The present invention can be appropriately changed in design without being limited to the above-described embodiment. In the above-described embodiment, the so-called ultra-small turning type backhoe is described. And a so-called small back turning type backhoe in which the turning trajectory drawn by the rear end of the turning table is accommodated within the front-rear and left-right widths of the crawler traveling device.

[0025]

As described in detail above, according to the present invention,
The cooler condenser and fan are placed in the bonnet and the exhaust air that has passed through the condenser is blown to high-temperature equipment such as the hydraulic oil tank and control valve in the bonnet, so that the visibility of the workers is not obstructed. The cooling effect of the equipment in the hood can also be obtained.

[Brief description of the drawings]

FIG. 1 is an overall side view of a backhoe according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a right side sectional view.

FIG. 4 is a front sectional view.

FIG. 5 is a system diagram showing a structure of a cooling device.

FIG. 6 is a longitudinal sectional side view when a cooler unit is provided in a canopy.

FIG. 7 is a sectional plan view of the same.

FIG. 8 is a sectional view of the duct portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Backhoe 8 Cooling device 9 Cooler unit 25 Cooler condenser 27 Fan 15 Hydraulic oil tank 16 Control valve 33 Inlet

Claims (5)

[Claims] 1. A cooling condenser and a fan for cooling the condenser are provided in the bonnet so as to blow exhaust air having passed through the cooling condenser to high-temperature equipment in the bonnet. Backhoe cooling device. 2. A hydraulic oil tank and a control valve are disposed adjacent to each other in a bonnet, and exhaust air passing through a cooler condenser is blown to at least the hydraulic oil tank of the hydraulic oil tank and the control valve. The cooler condenser and the fan for cooling the condenser are disposed in the hood as described above. 3. The backhoe cooling device according to claim 2, wherein the cooler condenser and the fan are disposed above a hydraulic oil tank and a control valve. 4. The backhoe cooling device according to claim 1, wherein an intake port for sending outside air to the cooler condenser is formed in the hood. 5. A driver's seat is provided on a swivel, a cabin or canopy roof is provided above the driver's seat, and a cooler unit having an evaporator is disposed on the roof. The cooling device for a backhoe according to any one of claims 1 to 4.