JP2001334822A - Condenser cooling device for construction machine air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling system having balanced heat distribution by cooling with air a rotating motor and a control valve and other units. SOLUTION: A construction machine having a rotary body on its upper section is provided with a condenser for an air conditioner separated from an oil cooler and a radiator, wherein an air flow cooling the condenser passes through an area where the rotary motor and the control valve are positioned, so that both of them can be cooled with air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a cooling system for a condenser for an air conditioner mounted on a construction machine.

[0002]

2. Description of the Related Art A construction machine such as a hydraulic shovel is equipped with a radiator for cooling an engine, an oil cooler for suppressing a rise in temperature of hydraulic oil, and a condenser for an air conditioner provided in a cab. Conventionally, a cooling device for cooling them has been provided in construction machines. In a conventional device, a device is used in which a radiator, an oil cooler, and a condenser are arranged in parallel, and a fan is arranged before or after these to cool the radiator, the oil cooler, and the condenser.

A conventional cooling device is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-270444. The conventional apparatus will be described below with reference to FIGS. FIG. 2 is a perspective view of the entire machine room of a conventional construction machine as viewed from above, and FIG. 3 is a cross-sectional view as viewed from arrows BB. In these figures, a counterweight 51 is provided at the rearmost part of the upper revolving unit 50, and a machine room 52
Is provided, and a cab 53 is provided at a front portion. An engine 55 is disposed substantially at the center of the machine room 52, and an engine cover 56 is provided above the engine 55. A hydraulic pump 57 is connected to the output shaft of the engine 55, and a cooling fan 58 is attached to the opposite output shaft.
A radiator 59 for cooling the engine, an oil cooler 60 for cooling the working oil, and a condenser 61 of the air conditioner are installed in front of the fan 58 (to the right). Further, an air hole 63 is provided at an appropriate position on the side plate 62 a of the machine room, and an air hole 64 is provided between the side plate 62 a and the engine cover 56. Further, the engine cover 56 is provided with a plurality of exhaust ports 65 and 66.

When the engine 55 is driven, the fan 58 is driven, whereby unheated air in the atmosphere is sucked from the air holes 63, 64 and the like, and the condenser 61,
The oil cooler 60, the radiator 59, and the engine 55 are sequentially cooled and are discharged from the exhaust ports 65 and 66 into the atmosphere.
A part of the air heated by cooling the engine 55 flows into the pump chamber and cools the pump 57 and the like.
It is emitted from an opening provided in 2b.

FIG. 4 is an explanatory view of the arrangement of the above-mentioned conventional device viewed from above. As shown in FIG. 4, the swing motor 70 is arranged substantially at the center of the upper swing body 50, and a device 71 such as a control valve is arranged adjacent to the side, for example, rearward. Device 71 such as swing motor 70 and control valve
Is surrounded by a house cover 72 and is partitioned by a revolving frame (not shown). On the other hand, as described above, the cooling air only passes through the rear part from left to right as shown by the dotted arrow in the figure.

[0006]

As described above, in the conventional apparatus, the condenser 61, the oil cooler 60, and the radiator 59 are arranged in parallel. Therefore, in order to sufficiently cool them, the blowing capacity of the fan 58 is required. Or the size of the condenser 61, the oil cooler 60, and the radiator 59 needs to be increased to increase the cooling capacity. Further, since the turning motor 70 and the control valve 71 are not cooled and are installed in an enclosed place, heat generated by the turning motor 70 and the control valve 71 is confined, and the temperature of the hydraulic oil rises. There was a heat balance problem.

SUMMARY OF THE INVENTION The present invention has been made under the above-mentioned background, and has as its object to provide a cooling system in which a condenser is separately arranged and a swing motor and the like are also air-cooled, and a heat balance is achieved.

[0008]

The present invention employs the following means to solve the above-mentioned problems. That is, claim 1
According to the invention described above, in a construction machine having an upper revolving unit, an air conditioner condenser is arranged separately from an oil cooler and a radiator, and an air flow that cools the condenser passes through a space in which a swing motor and a control valve are arranged. The swing motor and the control valve are also air-cooled.

According to a second aspect of the present invention, in the first aspect, the condenser for the air conditioner is a condenser with an electric fan.

[0010]

FIG. 1 is a diagram showing an embodiment of the present invention. Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the same components as those described in the conventional device (FIG. 7) are denoted by the same reference numerals, and detailed description thereof will be omitted. In FIG. 1, a proper position of the house cover 72, a position where the air in the atmosphere is easily taken in and a space where the device 71 such as the swing motor 70 and the control valve is disposed and the devices are easily cooled, for example,
The electric fan 1 is placed in an open place behind the cab 52.
The capacitor 11 with 0 is arranged. The house cover 72 in which the condenser 11 is disposed has an opening 12 for air suction, and an exhaust port 13 is provided in the house cover 72 so that the air cooled by the turning motor and the like can easily flow into the atmosphere.

According to the above configuration, in this embodiment, since the condenser 11 is arranged at a separate place, the cooling air is not heated by the condenser 11 and the air resistance of the cooling air passage is reduced. , The oil cooler 60, the radiator 59, and the engine 55 can be sufficiently cooled. Alternatively, the oil cooler 60 and the radiator 59 can be reduced in capacity and size by that much. On the other hand, since the air that has cooled the condenser 11 passes through the space in which the device 71 such as the swing motor 70 and the control valve is disposed and is released into the atmosphere, the device 71 such as the swing motor 70 and the control valve is also sufficiently cooled. Therefore, the temperature of the hydraulic oil does not rise abnormally due to the heat generation.
Therefore, a cooling system with good heat balance can be realized. Further, the use of a condenser with an electric fan as the condenser 11 makes the condenser 11 compact.

Although the above embodiment shows the case where the electric fan 10 is provided downstream of the condenser 11, it may be provided upstream. As described above, the embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the examples, and there are design changes and the like that do not depart from the gist of the present invention. Is also included in the present invention.

[0013]

As described above, according to the configuration of the present invention, the air cooled in the condenser is cooled by passing through the space in which the swing motor and the control valve device are arranged. This has the effect of preventing an abnormal rise in temperature of the hydraulic oil due to the heat generated by the device. Further, it is possible to sufficiently cool the oil cooler, the radiator, and the engine, thereby obtaining an effect of improving the heat balance as a whole.

[Brief description of the drawings]

FIG. 1 shows an arrangement configuration of an embodiment according to the present invention.

FIG. 2 shows a rear perspective view of a construction machine using a conventional apparatus.

FIG. 3 shows a sectional view from the arrow BB in FIG. 2;

FIG. 4 shows an arrangement configuration of a conventional apparatus.

[Explanation of symbols]

 Reference Signs List 10 electric fan 11, 61 condenser 12 suction opening 58 cooling fan 59 radiator 60 oil cooler 70 swing motor 71 control valve set

Claims (2)

[Claims] In a construction machine having an upper revolving structure, a condenser for an air conditioner is arranged separately from an oil cooler and a radiator, and an air flow cooling the condenser passes through a space in which a swing motor and a control valve are arranged. A condenser cooling device for an air conditioner of a construction machine, wherein the swing motor and the control valve are also air-coolable. 2. The condenser for an air conditioner according to claim 1, wherein a condenser with an electric fan is used.
3. A condenser cooling device for an air conditioner of a construction machine according to item 1.