JP2508130Y2 - Air conditioner for aerial work platforms - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cooling device for an aerial work vehicle, and more particularly to a cooling device in a bucket of an aerial work vehicle.

(Prior art) An aerial work vehicle in which a bracket that stands vertically on one side of a bucket is attached to a vertical shaft pivotally supported at the tip of a boom so that it can swing horizontally or directly or through an arm that can swing horizontally It is widely used for When performing work on electric wires with this type of aerial work vehicle, the work vehicle is equipped with equipment to prevent electric shock, so the workability in summer is severely reduced and workability is reduced.

Therefore, as shown in Japanese Utility Model Laid-Open No. 62-92299, a cooling device having a compressor, a condenser, an evaporator, and the like integrally incorporated therein is detachably attached to the outside of the bucket, and the cool air cooled by the cooling device is placed in the bucket. An air conditioner for an aerial work vehicle, which is configured to be supplied to an air conditioner to cool the bucket portion, has been put into practical use.

(Problems of the prior art) However, in the cooling device for an aerial work vehicle configured as described above, the cooling device in which a compressor, a condenser, an evaporator, and the like are integrally incorporated is large, and a protrusion amount to the outside of the bucket is large. Therefore, there is a problem that the bucket cannot be brought sufficiently close to the work object during the construction in a narrow space where the electric wires are mixed, and the worker is forced to work in an unnatural posture.

Further, since the intake hole of the evaporator is provided in the vicinity of the exhaust hole of the condenser, there is a problem that the cooling efficiency decreases due to the exhaust heat of the condenser.

The present invention has been made in view of the above problems, and makes the cooling device into a unit to reduce the size of each unit, and optimizes the arrangement of each unit to reduce the amount of protrusion to the outer portion of the bucket, and An object is to provide a cooling device for an aerial work vehicle in which a decrease in cooling efficiency is reduced.

(Means for Solving the Problems) In order to achieve the above-mentioned object, an air conditioner for an aerial work vehicle according to the present invention includes a heat dissipation unit including a compressor, a condenser, a cooling fan, and a hydraulic motor for driving the compressor, The heat absorption unit is composed of an evaporator and a blower fan, and the heat dissipation unit is installed in the space between the bucket and the bracket, and the heat absorption unit is installed in the bucket.

(Operation) An air conditioner for an aerial work vehicle according to the present invention configured as described above includes a heat radiating unit including a compressor, a condenser, a cooling fan, and a hydraulic motor driving the compressor, and a heat absorbing unit including an evaporator and a blower fan. It is possible to reduce the size of each unit because the two units are separately configured. This allows the heat dissipation unit to be installed inside the bucket and the bracket, and the heat absorption unit to be installed inside the bucket in a compact manner.Therefore, the amount of protrusion to the outside of the bucket is reduced, and in a narrow space where electric wires are intermixed. Even during construction, the bucket can be brought sufficiently close to the work target and the workability can be improved.

Also, because the heat absorption unit is separated from the heat dissipation unit,
Since the heat absorbing unit does not suck the thick exhaust gas of the heat radiating unit, the cooling efficiency can be prevented from lowering.

(Embodiment) An embodiment of the cooling apparatus for an aerial work vehicle of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 1, A is an aerial work vehicle, and the aerial work vehicle A includes a swivel base 2 mounted on a vehicle 1 so as to freely swivel,
A telescopic boom 3 pivotally supported on the swivel base 2 so as to be adjustable up and down, a vertical shaft 4 attached to the tip of the boom 3, and a bracket 5 which is externally fitted to the vertical shaft 4 and is horizontally rotatable. And a bucket 6. The boom 3a on the tip side of the telescopic boom 3 is in the case of this embodiment.
It is an insulating boom made of FRP.

The bucket 6 is made of a highly insulating material such as FRP, and an inner case 7 made of polyethylene is inserted inside the bucket 6 to enhance insulation and prevent electric shock accidents for workers. It is supposed to do. Further, an operation box 9 provided with an operation lever 8 and a switch for controlling the extension / contraction drive of the telescopic boom 3 and the swing drive of the bucket 6 is attached to the upper surface of one end side of the bucket 6. The inner case 7 is formed with a recess on the side wall thereof, and the outer surface of the side wall of the inner case 7 and the bucket 6 are
A space 24 for accommodating a heat absorption unit, which will be described later, is formed between the inner surface of the side wall 6a.

Reference numeral 10 denotes a lower portion of the operation box 9 and a sidewall 6a of the bucket 6.
And a heat dissipation unit mounted in the space 11 between the vertical shaft 4 and the vertical shaft 4. The heat dissipation unit 10 includes a compressor 12 that compresses a refrigerant, a condenser 14 that cools the refrigerant compressed by the compressor 12 and has a high temperature by a wind from a cooling fan 13 to liquefy the refrigerant, a receiver 15, and the compressor 12.
And a generator 17 driven by the hydraulic motor 16 to generate electric power for driving the fan.

Reference numeral 18 is a heat absorption unit mounted in the bucket 6. The heat absorption unit 18 is an expansion valve 21 that vaporizes the refrigerant supplied from the heat dissipation unit 10.
And an evaporator 19 for exchanging heat between the refrigerant that has been vaporized by the expansion valve 21 and has become low temperature and the surrounding air, and the cool air cooled by the evaporator 19
It is composed of a blower fan 20 that blows air inside.

22 is the heat receiving unit and the latter stage of the receiver 15 of the heat dissipation unit 10.
Reference numeral 18 is a flexible hose for refrigerant that connects the upstream of the expansion valve 21 of 18, and 23 is a flexible hose for refrigerant that connects the downstream of the evaporator 19 of the heat absorption unit 18 and the upstream of the compressor 12 of the heat dissipation unit 10. These hose 2
2, 23 are connected to each other through a through hole or a notch formed in the side wall 6a of the bucket 6.

Reference numerals 25 and 26 respectively denote an intake hole of the heat absorbing unit 18 provided by being provided at a position corresponding to the heat absorbing unit 18 on the side wall of the inner case 7, and a blower hole for sending the air cooled by the evaporator 19 into the bucket 6. is there.

27 and 28 are hydraulic pipes for supplying and discharging pressure oil to and from the hydraulic motor 16 of the heat dissipation unit 10. The hydraulic piping is connected to the hydraulic switching valve 29 in the operation box 9, and the hydraulic oil from the hydraulic pump (not shown) provided on the vehicle 1 side is supplied to the hydraulic motor 16 by the switching control of the hydraulic switching valve 29. It is designed to supply and drive the compressor 12 and the generator 17.

Reference numeral 30 is a cover that covers one side of the bucket 6 and the operation box 9 attached to the one side, the heat dissipation unit 10, and the like.

 Next, the operation will be described.

To cool the inside of the bucket 6 for performing electric wire construction,
The hydraulic pressure switching valve 29 may be switched to supply pressure oil to the hydraulic motor 16 to drive the hydraulic motor 16.

As a result, the compressor 12 is driven, so that the refrigerant is compressed by the compressor 12 and then supplied to the condenser 14. The condenser 14 cools and liquefies the high temperature refrigerant compressed by the compressor 12 by the cooling fan 13. The liquefied refrigerant is supplied to the heat absorbing unit 18 via the flexible hose 22. The refrigerant supplied to the heat absorbing unit 18 is vaporized by the expansion valve 21 and then supplied to the evaporator 19. Evaporator
The refrigerant passing through the evaporator 19 removes heat of vaporization from the air passing through the evaporator 19, that is, the air taken in by the blower fan 20 through the intake hole 25, and is cooled as low-temperature air from the blower hole 26 through the bucket 6.
The inside of the bucket 6 is cooled by blowing air inside.
The refrigerant flowing out from the evaporator 19 is the flexible hose 23.
The gas flows into the compressor 12 of the heat radiating unit 10 again via, and the above cycle is repeated.

The cooling device of the present invention includes a heat radiating unit 10 and a heat absorbing unit.
Since 18 are separated and each unit is connected with a flexible hose, each unit can be downsized, and it is possible to distribute it in the empty space of the bucket of an aerial work vehicle and reasonably incorporate it. It is possible. As a result, the bucket 6 is
Since it is possible to eliminate large protrusions on the outer surface, the bucket can be brought close enough to the work object even when working in a narrow space where electric wires intersect, and it is possible to work in a comfortable position Is.

Further, since the heat absorbing unit is arranged separately from the heat radiating unit, the hot exhaust gas of the heat radiating unit does not flow into the heat absorbing unit, and the cooling efficiency can be improved.

In the above description, the embodiment in which the cooling device of the present invention is applied to the aerial work vehicle in which the bucket 6 is attached to the vertical shaft 4 pivotally supported at the tip of the boom 3 so that the bucket 6 can be horizontally swiveled. As shown in the figure, an arm 31 is attached to the vertical shaft 4 pivotally supported at the tip of the boom 3 so that the arm 31 can horizontally swivel.
Needless to say, it may be applied to a so-called articulated work platform with a bucket 6 attached to the tip of the bucket 6 so as to be horizontally rotatable.

Further, it goes without saying that the inner case 7 may not be inserted in the bucket 6 and may be adopted in a work vehicle of an aerial work type other than the withstand voltage specification. In this case, set the heat absorption unit 18 to the bucket 6
It can be attached directly to the side wall of the and the cover can be attached to the mechanism section.

Further, it goes without saying that the hydraulic motor 16 that drives the compressor 12 may be an electric motor. In this case, if the motor for driving the fan is also configured to supply electric power from below, the generator 17 of the heat dissipation unit 10 can be omitted.

(Effect) Since the cooling device for an aerial work vehicle according to the present invention can eliminate a large protrusion on the outer surface of the bucket, the bucket can be sufficiently operated even in the case of construction in a narrow space where electric wires intersect. In addition to being able to approach the work target and working in a comfortable posture, it is possible to improve the cooling efficiency without the hot exhaust air of the heat dissipation unit flowing into the heat absorption unit. It does not have an excellent effect.

[Brief description of drawings]

FIG. 1 is a side view of an aerial work vehicle equipped with the cooling device of the present invention, FIG. 2 is an overall explanatory view of the cooling device of the present invention, and FIG. 3 is an explanation of a cooling cycle of the cooling device of the present invention. FIG. 4 is an explanatory view of another embodiment of the present invention. Boom …… 3, Vertical axis …… 4 Bucket …… 6, Bracket …… 5 Heat dissipation unit …… 10 Condenser …… 14, Compressor …… 12 Cooling fan …… 13, Hydraulic motor …… 16 Heat absorption unit …… 18 Evaporator ...... 19, blower fan …… 20 inner case …… 7, intake hole …… 25 blower hole …… 26

Claims (2)

(57) [Scope of utility model registration request] 1. A cooling system for an aerial work vehicle comprising a vertical shaft pivotally supported at the tip of a boom, and a bracket standing upright on one side of the bucket so as to be horizontally rotatable, either directly or through an arm capable of horizontally rotating. The cooling device includes a heat dissipation unit including a compressor, a condenser, a cooling fan, and a hydraulic motor that drives the compressor, and a heat absorption unit including an evaporator and a blower fan, and the heat dissipation unit includes the bucket. An air conditioner for an aerial work vehicle, wherein the heat absorbing unit is mounted in a bucket in a space between the bracket and the bracket. 2. The bucket has an inner case inserted inside the bucket, the heat absorbing unit is arranged in a space formed between an inner surface of the bucket side wall and an outer surface of the inner case side wall, and the heat absorbing unit of the inner case side wall is disposed. An air conditioner for an aerial work vehicle according to claim 1, characterized in that an intake hole and a ventilation hole are provided at a position corresponding to the unit.