JPH01285597A - High position working vehicle - Google Patents

Abstract

PURPOSE:To enlarge working space in a working box and improve operational property of an operation lever and switches in an operation panel, by providing a refrigerating cycle unit and a heating medium force feed pump in the chassis side and providing a third heat exchanger within the working box. CONSTITUTION:A compressor 12 is driven with a hydraulic pump mounted in a high position working vehicle, a refrigerating cycle unit 11 provided on its chassis side is actuated, and heating medium of a heating medium circulating unit 17 is cooled or heated with a second heat exchanger 16. This cooled or heated heating medium is forcibly fed with a force feed pump 19 to a third heat exchanger 20 provided in the working box 5 side, hereby the interior of the working box 5 is cooled or heated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an aerial work vehicle, and particularly takes into consideration cooling or heating of a work box.

(Prior Art and Issues) For example, when working on electrical cables using an aerial work vehicle, the worker wears equipment to prevent electric shock.

During the summer, workers have difficulty withstanding the heat due to their equipment, reducing work efficiency.

Conventionally, in order to solve this problem, for example, a refrigerating cycle unit is attached to the inner wall of the work box of an aerial work vehicle. However, in this case, the refrigeration cycle unit becomes large, which makes the narrow work box even narrower and has the disadvantage that it becomes difficult to operate the operating levers and switches attached to the work box. It is also possible to install the refrigeration cycle unit on the chassis side of the aerial work vehicle and blow out the air cooled by the evaporator into the work box via a long pipe, but in this case, Because the piping is long, when the cooled air reaches the work box, it is heated by the outside air and the cooling effect is poor. Therefore, if the piping is wrapped with insulation material, the cooling effect will be improved, but the work box cannot be raised or lowered. For this reason, the piping also needs to be expanded and contracted or curved, which is difficult to do with piping wrapped with a heat insulating material.

(Means and effects for solving the problems) This invention was made in view of the above circumstances, and includes a refrigeration cycle unit including a compressor, a first heat exchanger, an expansion valve, and a second heat exchanger. , a heat medium circulation unit in which a heat medium pressure pump and a third heat exchanger are sequentially piped is added, and the heat medium to be pumped to the third heat exchanger is cooled or heated by the second heat exchanger. Furthermore, the refrigeration cycle unit and the heat medium pressure pump are installed on the chassis side of the aerial work vehicle, and the third heat exchanger is attached to the work box of the aerial work vehicle.

Then, the refrigeration cycle unit is operated by driving the compressor with a hydraulic pump attached to the aerial work vehicle, and the heat medium of the heat medium circulation unit is cooled or heated by the second heat exchanger. Alternatively, the heated heat medium is pumped to the third heat exchanger, thereby cooling or heating the inside of the work box.

(Example) In this example, the work box will be explained as an aerial work vehicle that can cool and heat the inside of the work box, but it may also be an aerial work vehicle that can only be cooled or that can only be heated. However, the present invention is not limited to this embodiment.

1 is an aerial work vehicle. That is, a swivel base 3 is vertically supported 3a on the chassis 2, and a telescoping boom 4 is horizontally supported 4a on the upper end of the swivel base 3 so as to be movable up and down. In addition, a work box 5 is mounted on a horizontal shaft support 5 at the tip of the telescopic boom 4.
a, and this work box 5 is designed to maintain a horizontal posture regardless of changes in the angle of elevation of the telescopic boom 4. Furthermore, an operation panel 6 equipped with operation levers and switches is attached to the upper part of the base end of the work box 5.

11 is a compressor 12, a four-way valve 13, a first heat exchanger 14,
This is a refrigeration cycle unit in which an expansion valve 15 and a second heat exchanger 16 are connected in sequence, and is installed in the chassis 2.

Reference numeral 17 denotes a heat medium circulation unit configured by sequentially piping a closed heat medium storage tank 18, a heat medium pressure pump 19, and a third heat exchanger 20, and a discharge side pipe 21 of the heat medium pressure pump 19 is connected to a second heat medium circulation unit. The heat medium that passes through the heat exchanger 16 and is pumped to the third heat exchanger 20 is cooled or heated by the second heat exchanger 16. Furthermore, the heat medium storage tank 18 and the heat medium pressure pump 19 of the heat medium circulation unit 17 are installed in the chassis 2, and the third heat exchanger 20 is installed in the work box 5. Cool air or warm air is blown into the work box 5 by a fan 22 (driven by a hydraulic motor) provided on the back side of the third heat exchanger 20. Note that the piping 23 leading from the discharge part of the piping 21 to the third heat exchanger 20 and the piping 24 leading from the third heat exchanger 20 to the heat medium storage tank 18 are made of flexible materials, and are made of flexible materials. It is routed via the telescopic boom 4.

Note that the heat medium storage tank 18 may be abolished and the pipe 24 may be connected to the suction side of the heat medium pressure pump 19a (Effects of the Invention) As described above, the present invention
and the heat medium pressure pump 19 are installed on the chassis 2 side, and the third
Since only the heat exchanger 20 is installed in the work box 5, the work space in the work box 5 is wider compared to a conventional refrigeration cycle unit installed in the work box, and the operation panel 6 can be operated easily. It does not interfere with the operation of levers or switches. In addition, compared to a system in which a refrigeration cycle unit is installed on the chassis side and the air cooled by this is sent under pressure to the work box via long piping, the temperature rise or drop caused by outside air while the heat medium is being pumped through the piping is significantly reduced. Therefore, the cooling or heating effect inside the work box 5 is good, and even though a thick insulating material is not wrapped around a long pipe, the cooling or heating efficiency does not decrease much.

BRIEF DESCRIPTION OF THE DRAWINGS The figures all show embodiments of the present invention, with FIG. 1 being an overall explanatory view and FIG. 2 being a side view of the aerial work vehicle. DESCRIPTION OF SYMBOLS 1... Aerial work vehicle, 2... Chassis, 5... Work box, 11... Refrigeration cycle unit, 12...
Compressor, 13... four-way valve, 14... first heat exchanger,
15... Expansion valve, 16... Second heat exchanger, 17...
- Heat medium circulation unit, 18... heat medium storage tank,
19... Heat medium pressure pump, 2o... Third heat exchanger. Applicant: ShinMaywa Kogyo Co., Ltd. Procedural amendment (method) August 2, 1988 1, Indication of case 1988 Patent Application No. 113768 2, Name of invention: aerial work vehicle 3, Person making amendment case Relationship with Patent applicant: 663 Address: 1-5-25 Kozone-cho, Nishinomiya-shi, Hyogo Prefecture, Showa 63
July 26, 2019 (starting gate) 5. Subject of amendment (1) Specification 6. Contents of amendment

Claims (1)

[Claims] A refrigeration cycle unit configured by sequentially piping a compressor, a first heat exchanger, an expansion valve, and a second heat exchanger, a heat medium pressure pump and a third heat exchanger, and the third heat exchanger. a heat medium circulation unit configured to cool or heat a heat medium pumped to the second heat exchanger, and the refrigeration cycle unit and the heat medium pressure pump are installed on the chassis side of the aerial work vehicle. , the above-mentioned aerial work vehicle, wherein the third heat exchanger is attached to a work box of the above-mentioned aerial work vehicle.