JP2743235B2 - Arrangement structure of outdoor unit for air conditioning in work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for arranging an outdoor unit for air conditioning in a working vehicle such as a hydraulic shovel.

[0002]

2. Description of the Related Art In general,
Some types of working vehicles such as hydraulic shovels allow the user to select between a normal specification with an open control section and a cabin specification with a control section covered by a cabin. It is desirable to prepare an air conditioner as option equipment or standard equipment. Conventionally, however, the outdoor unit that constitutes the air conditioner is
Because it was arranged in the internal space such as the engine room, it is necessary to secure an empty space in advance inside the turning part regardless of the specifications, and as a result, the aircraft may become larger. On the other hand, when the air conditioner is not provided, there is a problem in that an empty space is left inside the revolving portion, which causes a problem.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has as its object to provide a structure for arranging an outdoor unit for air conditioning in a work vehicle which can eliminate these disadvantages. The standard specifications allow the passenger to get on and off from the step on the left and right ends of the aircraft, and the cabin specification restricts the passenger from getting on and off from one step on the cabin that covers the control unit. In the work vehicle that can be selected, when the outdoor unit for air conditioning is arranged on the work vehicle of the cabin specification, the outdoor unit for air conditioning is arranged on a stepping-on / off step that is used only in the normal specification. It is characterized by having been provided. According to the present invention,
This eliminates the need for space for the outdoor unit for air conditioning that was secured inside the swivel unit, thereby contributing to the downsizing of the aircraft, and eliminating the waste of having an empty space inside the swivel unit without an air conditioner. It is something that can be done.

[0004]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a hydraulic shovel, and the hydraulic shovel 1 includes a crawler-type traveling unit 2 and the traveling unit 2.
And a working part 4 connected to the front end of the turning part 3 and the like, and each part is powered by an engine 5 mounted on the rear part of the turning part 3. Hydraulic operation is performed, but all of these basic configurations are conventional.

The turning section 3 has a normal specification in which a control section 3a provided at a position in front of the engine 5 and offset to the left is opened, and a cabin specification in which the entire control section 3a is covered with a cabin 6. In the normal specification, it is permissible to get in and out of the step portions 3b and 3c formed at the left and right ends of the turning portion 3, but in the cabin specification, the left and right sides of the cabin 6 are provided. Since only the opening / closing door 6a is provided, getting in and out of the right step 3c is restricted.

In the above-mentioned cabinet specification, the air conditioner can be equipped with an option, and the air conditioner equipped with the option is provided with a compressor 7 for pumping a refrigerant in a gaseous state, and a gas state for a refrigerant fed from the compressor 7. 9 for liquefying the refrigerant by forced cooling of the fan 8, a receiver 10 for temporarily storing the refrigerant liquefied by the condenser 9, and expansion for expanding the liquid refrigerant supplied from the receiver 10 into a low-temperature and low-pressure mist state. The compressor comprises a valve 11, an evaporator 12 for removing heat from the air supplied by the fan based on the vaporization of the refrigerant supplied from the expansion valve 11, a hydraulic motor 13 for driving the compressor 7, and the like. Is provided with an electromagnetic clutch 14 for interrupting driving, while the receiver 10 is Pressure detection switch 15 for detecting the pressure in is provided.

Reference numeral 16 denotes an indoor unit in which the expansion valve 11, the evaporator 12 and the like are integrally unitized. The indoor unit 16 is provided on a front surface of an indoor unit case 17 in which the expansion valve 11 and the evaporator 12 are installed. It is constructed by assembling a blow-out louver 18 that can be opened and closed and an air filter 19 that is detachable, but this is not the inside of the cabin 6 as in the prior art.
It is arranged in the upper end part of the window frame 6b formed on the rear surface so as to protrude rearward. That is, the indoor unit 16 is arranged using a dead space that does not interfere with the open / close area of the engine hood 20 that covers the engine 5.
The indoor unit 16 arranged in this manner is fixed to the window frame 6b with screws on the left and right side plates of the indoor unit case 17 and the front end of the top plate.
The air filter 8 and the air filter 19 are fixedly attached to the outside of the cabin 6 so as to face the inside of the cabin 6. A flange piece 17a projecting downward is integrally formed at the front end of the bottom plate of the indoor unit case 17. Therefore, the upper edge of the window glass 22 can be supported via the H-shaped rubber 21.

Reference numeral 23 denotes a pair of left and right support stays formed in a hollow shape. The lower end of the support stay 23 is fixed to the lower end of the rear surface of the cabin 6, while the upper end is upward and rearward. It projects in an inclined manner to support the bottom surface of the tip of the indoor unit 16 in a cheek stick shape. In the hollow portion of the right support stay 23, a high-pressure hose 24 for supplying a refrigerant to the indoor unit 16 and the refrigerant to the compressor 7 A low-pressure hose 25 for returning and a drain hose 26 for draining dew condensation of the evaporator 12 are inserted in a pipe.
Furthermore, in the present embodiment, the drain hose 2
6 is bifurcated, and the two drain hoses 26 are inserted into the left and right support stays 23, respectively, so that even if the body is tilted right and left, the discharge of dew condensation is not interrupted. , Left or right drain hose 26
Can be reliably discharged.

On the other hand, reference numeral 27 denotes an outdoor unit of the air conditioner, and the outdoor unit 27 is an outdoor unit case 28.
Inside the compressor 7, the capacitor 9, the receiver 1
0, the hydraulic motor 13 and the like are built in, but this is not an internal space such as an engine room as in the prior art, but a right step 3c formed at the right front end of the turning section 3. It is arranged in the outside space of.
That is, the outdoor unit 28 is arranged in a dead space on the right step 3c, which cannot be used in a cabinet specification equipped with an air conditioner.

Meanwhile, in the outdoor unit 27, the compressor 7 and the hydraulic motor 13 are arranged in the left and right parallel arrangement below the interior of the outdoor unit case 28, and the condenser 9 is arranged above the compressor 7 and the hydraulic motor 13. Since the parts generate vibrations, in the present embodiment, anti-vibration measures are taken at the time of installation. That is, the compressor 7 and the hydraulic motor 13 interlockingly connected via the belt 29 are mounted on a single base plate 31 supported on the bottom plate of the outdoor unit case 28 via the vibration isolating rubber 30 while the fan is mounted. The four corners of the condenser 7 integrated with the condenser 8 are mounted on the inner surface of the front plate of the outdoor unit case 28 via the vibration isolating rubber 32.

A hydraulic circuit 33 is incorporated in the hydraulic shovel 1. The hydraulic circuit 33 includes a pump unit 34 having a plurality of hydraulic pumps driven by the power of the engine 5, an arm cylinder 35, and a boom cylinder. 36,
A main control valve 43 for controlling a frequently used hydraulic actuator such as a bucket cylinder 37, a swing cylinder 38, a swing motor 39, left and right running motors 41 and 42, and a less frequently used blade cylinder 44;
The hydraulic circuit 33 is constructed by hydraulically connecting a sub-control valve 45 for controlling the operation of the motor and shifting the pilots of the traveling motors 41 and 42 and an oil tank 46 for storing hydraulic oil. Incorporates a hydraulic motor 13 for driving the compressor 7.
That is, the return oil path 47 of the sub-control valve 45 that is used less frequently is branched, the hydraulic motor 13 is connected to the branch oil path 48, and the return oil path 47 is intermittently located at a position below the branch point of the return oil path 47. An electromagnetic valve 49 is provided. Therefore, when the electromagnetic valve 49 is in the ON state, the return oil is supplied to the branch oil path 48 based on the interruption of the return oil path 47 to drive the hydraulic motor 13, while when the electromagnetic valve 49 is in the OFF state, the hydraulic motor 13 is driven. Has come to a halt.

The solenoid portion of the electromagnetic valve 49 is turned on and off based on a drive command from a temperature controller 50 disposed in the cabin 6, and based on pressure detection of the pressure detection switch 15. In order to perform the OFF operation, it is connected to the temperature controller 50 via the pressure detection switch 15, and furthermore, the ON-OF of the electromagnetic valve 49 is turned on.
F is connected to the electromagnetic clutch 14 in order to synchronize the drive of the compressor 7 with F. A delay timer relay 51 is interposed between the electromagnetic valve 49 and the electromagnetic clutch 14. That is, without turning on the electromagnetic clutch 14 simultaneously with the turning on of the electromagnetic valve 49, the turning on of the electromagnetic clutch 14 is delayed until the hydraulic motor 13 obtains the inertia force of the flywheel and the rotation is stabilized. .

In the embodiment of the present invention constructed as described above, the outdoor unit 27 of the air conditioner is not a conventional internal space such as an engine room, but a right-hand step formed at the right front end of the revolving unit 3. It is arranged in an external space on the part 3c. Therefore, it is possible to reduce the size of the body by eliminating the need for the space for arranging the outdoor unit 27 secured inside the swivel unit 3, or to determine the space for other members provided inside the swivel unit 3. It is also easy to secure, and it is possible to eliminate waste such as having an empty space inside the turning section 3 in the case where the air conditioner is not equipped.

In addition, the right-hand step portion 3c in which the outdoor unit 27 is provided is a dead space that cannot be used in a cabin specification equipped with an air conditioner, so that the effective use of the dead space can be measured. In addition, there is no inconvenience of pressing down the space for disposing other members disposed in the external space.

Further, in the embodiment, the compressor 7 and the hydraulic motor
Is mounted on a single base plate 31 supported on a bottom plate of the outdoor unit case 28 via a vibration isolating rubber 30, while the capacitor 7 integrated with the fan 8 is attached to the vibration isolating rubber 3.
2, the vibration generated by the compressor 7, the hydraulic motor 13 and the condenser 7 (fan 8) is prevented as much as possible, so that the quietness of the outdoor unit is improved. Can be significantly improved.

[0016]

[Effects] In summary, the present invention is constructed as described above. Therefore, the normal specification that allows the passenger to get on and off from the getting-on / off steps at the left and right ends of the aircraft, and one of the getting on and off by the cabin that covers the control unit. Although a cabin specification that restricts getting in and out of the cabin step is prepared, but when a cabin-specific work vehicle is equipped with an air conditioner, the cabin Since the outdoor unit for air conditioning is disposed by effectively using the dead space of the above, it is not necessary to secure a space for disposing the outdoor unit inside the turning portion as in the related art. Therefore, if it is possible to contribute to the miniaturization of the aircraft, the space where the outdoor unit is installed does not press down the space where other members are installed, and if the air conditioner is not equipped, the empty space inside the turning section It is also possible to eliminate the waste of having.

[Brief description of the drawings]

FIG. 1 is a plan view of a hydraulic shovel.

FIG. 2 is a side view of the same.

FIG. 3 is a plan sectional view of the indoor unit.

FIG. 4 is a sectional side view of the same.

FIG. 5 is a rear sectional view of the same.

FIG. 6 is a front view of the same.

FIG. 7 is a sectional view of a support stay.

FIG. 8 is an internal front view of the outdoor unit.

FIG. 9 is an internal side view of the same.

FIG. 10 is a hydraulic circuit diagram of the hydraulic shovel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic shovel 2 Running part 3 Revolving part 3a Control part 3b Left step part 3c Right step part 4 Work part 5 Engine 6 Cabin 7 Compressor 13 Hydraulic motor 16 Indoor unit 23 Support stay 24 High pressure hose 25 Low pressure hose 26 Drain hose 27 Outdoor unit 33 Hydraulic circuit 43 Main control valve 45 Sub-control valve 49 Electromagnetic valve

Claims (1)

(57) [Claims] 1. A specification selection between a normal specification capable of getting on and off from the stepping steps at both right and left ends of the fuselage and a cabin specification in which getting on and off from one stepping step is restricted by a cabin covering the control unit. When the outdoor unit for air conditioning is installed on the work vehicle of the above-mentioned cabin specification, the outdoor unit for air conditioning is installed on the stepping-on / off step used only in the normal specification. A structure for arranging an outdoor unit for air conditioning in a working vehicle, comprising: