JPS59190423A - Cooling apparatus for construction machinery and industrial machinery - Google Patents

Abstract

PURPOSE:To reduce the dimension of an apparatus and improve the noise suppressing effect by installing a radiator at the cooling-wind discharge port of a casing and opening a penetration hole onto which a noise suppressing duct is installed in the direction perpendicular to the shaft of the engine. CONSTITUTION:The driving shaft 19 of a centrifugal fan 2' is installed in parallel with the engine shaft, in front of an engine 1 arranged in parallel with a counterweight 3, and a casing 8 in vortex-shaped structure is arranged outside the centrifugal fan 2'. The cooling-wind discharge port 23 of the casing 18 is directed towards the counterweight 13, and a radiator assembly 3 constituted of a radiator 14 and an oil cooler 15 is installed onto the discharge port 23. In the counterweight 3, a penetration hole 20 is opened in the direction perpendicular to the shaft of the engine 1 and at the position opposed to the radiator assembly 3, and a noise suppressing duct 21 is installed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for construction machinery and industrial machinery, such as hydraulic excavators.

BACKGROUND ART Conventionally, in construction machines and industrial machines such as hydraulic excavators, engines are generally arranged side by side with a counterweight. The configuration of a conventional cooling system in any type of machine is as shown in FIG. 1, which is a plan view of a hydraulic excavator with the engine cover removed, and FIG. 2, which is a sectional view taken along line A-A in FIG. An axial fan 2 is attached to an axis parallel to the axis (not shown) of the engine 1 juxtaposed to the counterweight 13, and a radiator 14 for cooling engine cooling water is installed on an extension of the axis 1a. A radiator assembly 3 consisting of an oil cooler 15 for cooling hydraulic fluid is provided. The cooling air sent to the radiator assembly 3 is sucked by the axial fan 2 through an opening (not shown) provided in the cover 4 or the main frame 7, enters the engine room 5, and flows into the engine room 5. After being heated by heat exchange through air chamber 6, it is discharged to the outside of the aircraft from an opening provided in engine cover 7, as shown by the arrow in the figure. (The above may be reversed.) The direction of the air flowing around the engine 1, through the axial fan 2 and the radiator assembly 3 is parallel to the axis of the engine 1. (2) The air chamber 6 provided in series with the radiator assembly 3 has the following problems: Although it is necessary to leave a distance of several tens of millimeters or more between the radiator assembly 3 and the radiator assembly 3, the conventional system cannot provide a sufficiently large air chamber 6 due to design, and therefore the air chamber is narrow. 6, the air discharged from the radiator assembly 3 is bent in a right angle direction and discharged from the opening 8 to the outside of the aircraft, so the discharge air pressure of the axial fan 2 increases and the air volume decreases by that amount. Therefore, in order to obtain a sufficient amount of air, a larger driving force of the axial fan 2 is required.

(2) As mentioned above, since the air chamber 6 has a sufficient volume, the sound absorbing duct for absorbing the noise of the axial fan 2 and the radiator assembly 3 is sufficient in the air chamber G. Since it is not possible to provide an effective size, these noises escape to the outside of the aircraft through the opening 8 provided in the engine cover 7.

(3) Recently, the degree of sealing of the engine room 5 has been increased to prevent noise, so the absolute value of the static pressure within the engine room 5 has become larger. Therefore, the load applied to the axial fan 2 is also increasing.

Since the axial fan 2 is originally designed for low pressure, its efficiency decreases in a high pressure region, and it is driven at an undesirable operating point, consuming more power than necessary.

(4) The axial fan 2 and the shroud (J is circular, whereas the radiator assembly 3 is rectangular, so the cooling air cannot reach every corner of the shroud), Since the fan is an axial flow fan, the air flow velocity at the center of the fan is also low. Therefore, the flow velocity distribution of the cooling air with respect to the radiator assembly 3 becomes non-uniform, resulting in a decrease in cooling efficiency, and as the maximum flow velocity increases, noise also increases.

In addition, in Fig. 1 and Fig. 2 above, ]0 is Dobe rotating structure,
Reference numeral II indicates an undercarriage, 12 a front portion, 13 a counterweight, 16 a bulkhead constituting the engine room 5, and 17 a main frame of the upper revolving structure 1o.

The object of the present invention is to provide a construction machine which eliminates the above-mentioned problems, has a cooling member shaped like a J-shaped member, and has an improved noise reduction effect.
It is used to supply cooling equipment for industrial machinery.

In short, this invention provides a construction machine or an industrial machine in which an engine is juxtaposed to a counterweight, the axis of a centrifugal fan is arranged parallel to the axis of the engine, and the cooling air outlet of the casing of the centrifugal fan is arranged above the axis of the centrifugal fan. A radiator assembly is provided at the cooling air outlet of the casing facing the counterweight, and a through hole is formed in the counterweight at a position perpendicular to the axis of the engine and facing the radiator assembly. It has a structure in which a sound absorbing duct is provided inside the through hole.

The present invention will be explained below based on the drawings. Figure 3 shows
The C-0 sectional view of FIG. 4, which will be described later, is 1 in FIG. 3.
The sectional view taken along line 3-B and FIG. 5 show a view taken along arrow D in FIG.

First, the configuration will be explained. The cooling system in the engine room 5 is configured as follows (i.e., the engine arranged in parallel to the counterweight 13), and is mounted in front of the engine parallel to the axis (not shown) of the engine 1. Fan 2' shaft 19
, a drive belt is provided between the two shafts, a casing 18 with a roll-shaped structure is provided outside the centrifugal fan 2', and the cooling air outlet 23 of the casing 18 is connected to a counterweight. The above casing 1 towards the direction of 13
A radiator assembly 3 consisting of a radiator 14 and an oil cooler 15 is installed in the cooling air outlet 23 of 8.
At the same time, a through hole 20 is formed in the counterweight I3 at a position perpendicular to the axis of the engine 1 and facing the radiator assembly 3.
A sound-absorbing duct 21 is installed inside the duct 22, the outer wall of which is made of steel plate or wood, and the inner wall made of a sound-absorbing material made of excellent glass wool and held down by a perforated plate such as punched metal.
a, 22 b+! Show bell mouth.

Next, the action will be explained as follows.

That is, when the engine 1 is started and the double-sided suction type centrifugal fan 2' is rotated, two cooling air flow paths are created. In the 10th flow path, cooling air taken in from the cover 4 and the opening (not shown) in the main frame B passes through the work/gin room 5, and is connected to the bell mouth 22a and the bell mouth 22a side of the centrifugal fan 2'. Hantani, casing 18,
The radiator assembly 3 and the sound absorbing duct 2 are exhausted to the outside of the aircraft. Further, in the 20th flow path, cooling air taken in from an opening (not shown) provided in the engine cover 7 passes through the air chamber 6, and passes through the bell mouth 22 b and the half of the centrifugal fan 2' on the bell mouth 22 b side. , casing 1
8, the sound is discharged to the outside of the aircraft via the radiator assembly 3 and the sound absorption duct 21. That is, the cooling air is taken in in the axial direction of the engine 1, and the direction of the cooling air is changed by the centrifugal fan 2' in a 1M angle direction with respect to the axis of the engine 1, and is directed to the counterweight 13 in a direction perpendicular to the counterweight 13. The sound is discharged from a sound absorbing duct 21 provided in the opened through hole 20 in the direction of the arrow in the figure.

In addition to the above-mentioned embodiments, regarding the support structure of the fan and the drive method of the fan in this invention, the seventh support structure is supported on one side or both sides by a bearing provided on the casing side,
It is also possible to transmit power from the engine through a flexible shaft, universal coupling, etc., or to drive it by a separately provided motor, hydraulic motor, etc.

Furthermore, instead of providing the double-sided suction type centrifugal fan as described above, it is also possible to use a single-sided suction type centrifugal fan with one bellmouth provided in the casing.

As explained above, according to the present invention, the following effects can be obtained. In other words, (1) Since a centrifugal fan is used, the fan can be operated at a highly efficient operating point in an area with high static pressure, making it possible to make the engine room more sealed than before. can reduce noise.

(2) Since the above-mentioned centrifugal fan is a fan for high pressure, it should be possible to increase the resistance of the cooling air passage.

In other words, the cooling air passages in the cooling air intake (i.e., the above-mentioned openings), the engine room, the air chamber, etc. may be narrow (or the passages may have many bends) without taking into account It is also possible to design a sound absorbing duct that has a large sound damping effect (that is, one that has a large air resistance).

(3) Since the cooling air by the centrifugal fan is uniformly sent to the radiator assembly by the casing, the wind speed of the cooling air σ) hitting the radiator assembly becomes uniform and the cooling efficiency increases. Therefore, it is possible to downsize the fan and radiator assembly, and the cooling system such as the fan and radiator assembly can be designed with a dimensional margin.

(4) Since a sufficiently large sound absorbing duct can be provided in the through hole of the counterweight, the noise at the cooling air outlet can be sufficiently reduced compared to the conventional example.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional hydraulic excavator with the engine cover removed, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line C-C in FIG. 4 is a sectional view taken along the line B--B in FIG. 3, and FIG. 5 is a view taken along arrow D in FIG. 4. Description of symbols: engine, 1a, shaft of axial fan 2, 2', centrifugal fan, 3, radiator assembly, 4
Cover, 5. Engine room, 6. Air chamber, 7.
・・Engine cover, 8・Opening, 9・Shroud, 13・Karancra eight, 14・・Radiator,
15° Oil cooler, 16... bulkhead, 18... casing, 19... shaft of centrifugal fan 2', 20 through hole, 21... sound absorption duct, 22a, 22b... bell mouth,... cooling Air outlet agent patent attorney Junnosuke Nakamura 1 Diagram! Figure 3

Claims (1)

[Claims] In construction machinery or industrial machinery in which an engine is arranged in parallel with a counterweight, the axis of a centrifugal fan is arranged parallel to the axis of the engine, the cooling air outlet of the casing of the centrifugal fan is directed toward the counterweight, and the casing is A radiator assembly is provided at the cooling air outlet of the engine, a through hole is formed in the counterweight at a position perpendicular to the axis of the engine and facing the radiator assembly, and a sound absorbing duct is provided in the through hole. A cooling system for construction machinery and industrial machinery featuring the following.