JPH11158925A - Cooler for backhoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooler suited to a backhoe considering the importance of arranging various types of equipment in a manner that prevents them from obstructing the driver's view because excavation is executed while moving the bucket in many directions including, back and forth, up and down, and sideways. SOLUTION: The first unit (a) that is equipped with a compressor 14, a condenser 15, and a liquid receiver 16 is mounted in an engine room 6, and the second unit (b) that is furnished with an evaporator and an expansion valve is arranged in the rear of the inside of the roof 12 of a driving section, and a blowoff opening that supplies cool air produced by the second unit (b) to the driving section is arranged at the right and left in the front of the inside of the roof 12 in a manner of blowing it downward. The left blowoff opening and the second unit (b) are connected communicatively in a cool air channel along the left edge of the roof 12, and the right blowoff opening and the second unit (b) are connected communicatively in the right cool air channel along the right end of the roof 12.

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 making it easy to operate an excavating work device.

[0002]

2. Description of the Related Art As a spot cooler for a working machine, there is known a spot cooler for a combine as disclosed in Japanese Utility Model Laid-Open No. 6-50915 and a tractor as disclosed in Japanese Patent Laid-Open No. 7-47832. 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, since the position of the bucket is excavated in multiple directions of front and rear and right and left, it is important to arrange each device so as not to disturb the eyes of the pilot, and that point was taken into consideration. It is an object to provide a cooling device suitable for a backhoe.

[0004]

According to a first aspect of the present invention, a first unit having a compressor, a condenser, and a receiver is provided in an engine room, and a first unit having an evaporator and an expansion valve is provided. The two units are arranged on the rear side of the inside of the roof with respect to the operation unit, and an air outlet for supplying the cool air generated in the second unit toward the operation unit is provided to constitute a backhoe cooling device.

According to a second aspect of the present invention, in the first aspect, the air outlet is disposed at the front inside and on the left and right ends of the roof in a state where the cool air from the air blows downward, and a left cool air passage along the left end of the roof. The left outlet communicates with the second unit, and the right outlet communicates with the second unit through a right cool air passage along the right end of the roof.

A third invention is the first or second invention, wherein
A roof cover forming the interior surface of the roof is disposed so as to cover the second unit and the left and right outlet portions from below.

A fourth invention is characterized in that, in the third invention, a heat insulating material is interposed between the roof and the roof cover.

A fifth invention is characterized in that, in the second to fourth inventions, a window is provided on the roof between the front and rear of the air outlet and the second unit so that the upper part of the roof can be visually recognized from the operation unit. .

According to a sixth aspect of the present invention, in the first to fifth aspects, a pillar made of a pipe for supporting a roof is provided, and the inside of the pillar is used as a space for a passage of a refrigerant circulating between the first unit and the second unit. It is characterized by.

According to the structure of the first aspect, the first unit having the compressor which requires relatively large power is arranged in the engine room close to the drive source, so that the transmission unit can be made compact. While taking in engine power. And since the 2nd unit is arrange | positioned at the back part of the roof inside with respect to the driving | running part, the outlet and the 2nd unit equipped so that it may go to a driving | running | working part will be in a mutually close state, and while cooling efficiently, The rear arrangement of the second unit on the roof ensures that the second unit does not obstruct the operator's eyes during the excavation operation.

Further, since the first and second units are located behind the turning center of the swivel base, the rear balance of the body can be strengthened, and the stepping during excavation work can be more effectively performed. This is advantageous in that:

According to the second aspect of the present invention, the outlet is disposed at the front and left and right ends on the inside of the roof in a state where the cool air from the outlet blows downward, and the cool air passages therethrough are provided on the roof. Since it is arranged close to the left and right ends, the front center is high and the left and right are low as the inside surface of the roof. this is,
The bucket is often operated at a high position, such as when digging a slope on the embankment, and the layout is suitable for backhoes that need to secure an upward view, and the visibility during excavation work with the bucket positioned at a high place is good. Can be secured.

According to the third aspect of the present invention, since the roof cover, which is the interior material covering the second unit and the air outlet, is provided, the cooling device parts are hidden and the appearance is improved, and the cooling unit is not covered with the roof. A space is formed between the spaces to form a heat insulating layer, which can block or reduce radiant heat from the roof, and can suppress an increase in the temperature of the operating unit even when the sunshine is strong, such as in the middle of summer.

According to the fourth aspect of the present invention, since the heat insulating material is interposed between the roof and the roof cover, the above-mentioned radiant heat shielding effect can be strengthened, and the temperature rise of the operating section can be more effectively prevented. And a sound absorbing effect of absorbing the driving noise in the second unit also occurs.

According to the fifth aspect of the present invention, the window is provided on the roof between the outlet and the second unit so that the upper part of the roof can be viewed from the operating unit. The state at the time of turning, and the state at the time of the turning posture in the model where the boom can be folded to the offset state,
Anything that can be seen from the roof window and is convenient can be arranged without impairing the function as the cooling device.

According to the sixth aspect of the present invention, the interior of the pipe post supporting the roof is a space for the passage of the refrigerant circulating between the first unit and the second unit. In addition to performing the dual function of supporting function and refrigerant passage, the refrigerant passage is not visible from the outside, and the appearance can be improved. In addition, the strut can be a heat insulating member for the refrigerant, which can contribute to the improvement of the operation efficiency of the cooling device.

[Effect] The cooling device according to any one of the first to sixth aspects is advantageous in terms of the position of the center of gravity of the fuselage and the balance between the front and rear thereof, and is excellent in the excavation work device without obstructing the eyes. It was possible to efficiently supply cold air to the operator while maintaining the maneuverability, thereby improving the working environment.

According to the cooling device of the present invention, the cooling air can be supplied to the driving section from the front left and right sides of the roof, so that a cooling state can be obtained efficiently, and a roof shape can be obtained in which the bucket work at a high place can be visually recognized well. There are advantages.

In the cooling device according to the third aspect, it is possible to improve the appearance of the inside of the roof by the roof cover, and to suppress the temperature rise of the operating unit effectively.

The cooling device according to the fourth aspect has the advantage that the effect of suppressing the rise in temperature of the operating unit is further enhanced by the interposition of the heat insulating material, and the effect of preventing the noise of the second unit is also provided.

In the cooling device according to the fifth aspect, the operating environment is improved by the cooling of the operating unit by the window provided on the roof.
Even when the bucket is lifted up to a high place, the excavation work device can be preferably obtained with good visibility.

In the cooling device according to the sixth aspect, the strut supporting the roof can be rationalized to also serve as the refrigerant passage.
While the first unit and the second unit are separately arranged on the swivel base and the roof, a preferable one can be obtained without impairing the appearance of the support portion.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a backhoe, 1 is a crawler traveling device, 2 is an excavation work device, 3 is a swivel, 4 is a canopy, 5 is an operation unit, and 6 is a driving unit. The driving unit 6 is configured as a small rear turning type including three bonnets: a tank hood 7 on the right side of the driver's seat 10, a rear hood 8 and an auxiliary machine hood 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 includes a pair of right and left columns 11, 11 standing up from the prime mover 6, and a roof 12 for mud and sunshades.
It is composed of The support 11 has a shape in which an upper part thereof is bent slightly forward, and a second unit b in a cooling device A to be described later,
Main air outlets 13, 13 in a state where cold air blows downward are arranged. Next, the cooling device A will be described.

As shown in FIGS. 3 to 7, the cooling device A includes:
A first unit a including a compressor 14, a condenser 15, a liquid receiver 16 and the like is provided in a driving unit 6 which is an engine room,
A second unit b including an evaporator 17, a blower 18, an expansion valve 19, and the like is arranged at a rear portion inside the roof 12 with a slight downward inclination, and the cool air generated in the second unit a is directed to the operation unit 5. It is of a vapor compression type provided with blow-off ports 13 and 13 for supplying air. 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 first unit a will be described. The compressor 14 is driven by the power of the engine E and compresses the gaseous refrigerant. The condenser 15 is arranged so as to be blown and cooled by the cooling fan 21 of the radiator 20, and the vertically long liquid receiver 16 is arranged near the condenser 15. A pair of back and forth refrigerant supply / discharge hoses 22 and 23 circulating between the first unit a and the second unit b penetrate the upper surface of the hood 8 and are formed on the lower side surface of the right support 11. It passes through the inside of the right support 11 from the hole 11a, and
It is taken out from the upper hole portion 11b formed on the inner side surface of the upper portion and arranged in the second unit b.

As shown in FIGS. 4 and 5, the second unit b disposed on the roof 12 includes a pair of left and right outlets 13 and 1.
3. A bifurcated cold air duct 25, an evaporator 17, and a pair of left and right blowers 18, 18 are arranged in this order from front to rear, and the starting end side of the cool air duct 25 and the blowers 18, 1
8 is covered with a cover 26 surrounding the evaporator 17. A heat insulating material (insulator) 27 such as styrene foam is provided on the inner surface of the roof 12, and a roof cover 28 covering the heat insulating material 27 and the second unit b is provided as an interior material.

At the rear end of the roof cover 28, a pair of left and right filters 29, 29 for introducing outside air are laid sideways, and the outside air taken in from there is passed through the inside of the roof cover 28 to the blowers 18, 18. Inhaled. Then, the air blown by the blower 18 is cooled by the evaporator 17 to become cool air.
Will start blowing out. The cool air duct 25 is connected to the left outlet 1
3 and a right cool air passage 25b communicating with the right air outlet 13. The left and right cool air passages 25a and 25b are laterally extended along the left and right ends of the roof 12. It is located close to the edge.

In a 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 part is lowered, and the water generated by the temperature drop at the evaporator 17 site. When the droplets fall on the cover 26 as droplets, they collect on a drain 26a provided at the rear right of the cover 26. Drain hose 3 for drain 26a
The drain hose 30 is connected to the upper and lower holes 11.
b, 11a through the inside of the right support 11
It is routed inside and discharged from outside the aircraft.

The shape of the roof cover 28 is such that the left and right outlets 1
The left and right portions of the portions 13 and 13 and the left and right portions of the pair of left and right duct portions 25a and 25a in the cold air duct 25 are lifted upward, that is, the ceiling is set high in that portion, and When working in a position where the bucket is at a high position, the operator sitting on the driver's seat 10 can easily see upward and forward.

As shown by the imaginary line in FIG. 5, a window 32 is provided between the left and right cold air passages 25a and 25b so that the driving section 5 can visually recognize the roof 12 above the roof. 2a can be seen through the roof, making it easier to maneuver, which is preferable. The roof 12 is mounted and supported by a bolt or the like on a roof frame 24 formed over the right and left columns 11,11.

[Another Embodiment] As shown in FIGS. 8 and 9,
The roof 12 includes a pair of left and right rear struts 11, 11 and a pair of left and right front struts 31, 31, and a four-post canopy 4 in which the second unit b is installed inside the roof 12 in a horizontal state. A backhoe may be used. That is, the evaporator 17, the blower 18, and the cover 26 are horizontally arranged, and the drains 26a formed on the cover 26 are formed at four places in front, rear, left and right, and four drainage hoses 30 connected thereto are provided. It is arranged in the swivel 3 through the inside of all the four pillars 11 and 31.

By providing the drain 26a in the front, rear, left and right directions, the drain can be drained from any of the drains 26a even if the backhoe posture during the excavation operation is inclined in any of the front, rear, left and right directions. The supply / discharge hoses 22 and 23 for connecting the first unit a and the second unit b are connected to the right and left rear columns 11 and 11 respectively.
It is distributed and distributed.

[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 longitudinal 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 the structure of a cooling device.

FIG. 8 is a side view of a turntable showing a cooling device having another structure.

FIG. 9 is a plan view showing a main part of the cooling device of FIG. 8;

[Explanation of symbols]

 5 Operating part 6 Engine room 11 Support 12 Roof 13 Outlet 14 Compressor 15 Condenser 16 Liquid receiver 17 Evaporator 19 Expansion valve 25a Left cool air passage 25b Right cool air passage 27 Insulation material 28 Roof cover a First unit b Second unit

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroo Nakata 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Plant (72) Inventor Yuji Yamashita 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. Inside

Claims (6)

[Claims] 1. A first unit having a compressor, a condenser, and a liquid receiver is provided in an engine room, and a second unit having an evaporator and an expansion valve is disposed at a rear portion inside a roof with respect to an operation unit. A backhoe cooling device provided with an air outlet for supplying cold air generated in the second unit to an operation unit. 2. The air outlet is disposed at the front and left and right ends inside the roof in a state where cool air from the air blows downward, and the air outlet on the left side in a left cool air passage along the left end of the roof. The backhoe cooling device according to claim 1, wherein an outlet communicates with the second unit, and the right outlet and the second unit communicate with each other through a right cool air passage along a right end of the roof. 3. The backhoe cooling device according to claim 1, wherein a roof cover forming an interior surface of the roof is disposed so as to cover the second unit and the left and right outlet portions from below. . 4. The backhoe cooling device according to claim 3, wherein a heat insulating material is interposed between upper and lower portions of the roof and the roof cover. 5. The window according to claim 2, wherein a window is provided on the roof between before and after the outlet and the second unit so that an upper part of the roof can be visually recognized from an operating unit. Backhoe cooling system. 6. A column made of pipe for supporting the roof, and the inside of the column is a space for a passage of a refrigerant circulating between the first unit and the second unit. 2. The cooling device for a backhoe according to claim 1.