JPH09158882A - Packaged screw compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent temperature rising in a package without increasing a noise value by providing in a compressed air sucking duct, a ventilating opening for preventing temperature rising in the package after the operation of a compressor is stopped by natural ventilation. SOLUTION: In an oilless screw compressor, a gear casing 5 is arranged by being opposed to a motor 6 on the upper part of a motor base 7, and a compressor main body is attached to this casing 5. A filter duct 2 to which an intake duct 1 is connected is attached to the upper part of the compressor main body. The whole compressor is covered with a common base 16 and a package 9, and a ventilating fan 8 for ventilating the inside of the package 9 is attached on the motor base 7. The inside of the intake duct 1 is divided into two passages by a partitioning plate 14, and a ventilating hole 12 is opened to one passage. When the compressor is stopped, air warmed up by radiation of each apparatus is discharged from a ventilating opening 11 to the outside of the package 9 through a ventilating hole 12 so as to prevent the temperature rising in the inside of the package 9.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a packaged screw compressor.

[0002]

2. Description of the Related Art In a conventional package type screw compressor, as disclosed in, for example, Japanese Patent Laid-Open No. 62-85194, a ventilation port for preventing a temperature rise inside the package after the compressor has been stopped is provided. I didn't have it. For this reason,
There is a risk that the temperature inside the package will rise after the compressor is stopped, and the temperature inside the starter board will rise accordingly, adversely affecting the performance and life of the equipment.

[0003]

In the above-mentioned prior art, since there is no ventilation port for preventing the temperature rise inside the package after the compressor is stopped, the temperature rise inside the package after the compressor is stopped and As a result, there was a risk that the temperature in the starting board would rise.

It is an object of the present invention to provide a ventilation port for preventing this at a low cost, and to prevent noise from increasing during operation of the compressor by adding the ventilation port.

[0005]

In order to solve the above-mentioned problems, in the package type screw compressor of the present invention, a partition plate is provided in the intake duct for compressed air attached to the upper part of the package, and the intake duct passage is provided. Is divided into two, and a ventilation port is provided on one side. As a result, after the compressor operation is stopped, the air warmed in the package rises and is naturally discharged through the ventilation port, so that the temperature inside the package can be prevented from rising.

Further, since the ventilation port is provided in the duct,
It is possible to prevent an increase in compressor noise due to the provision of the ventilation port.

In the package, a partition plate was added in the intake duct for sucking the compressed air attached to the upper part, and a ventilation port was provided on one side thereof. Since the warmed air rises, the heat is naturally exhausted through this ventilation port, and the temperature rise inside the package can be prevented. Further, since the ventilation port is provided in the duct, the addition of the ventilation port also prevents an increase in noise during operation of the compressor. By adopting this structure, the ventilation port can be provided at low cost without newly adding a duct. Further, by arranging the position of the ventilation port provided in the intake duct at the upper part of the starter board, it is possible to more effectively prevent the temperature inside the starter board from increasing, which is a problem in particular.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows the structure of an oil-free screw compressor embodying the present invention. In the structure of this compressor, a motor 6 is arranged above a motor base 7, and a gear casing 5 is arranged so as to face the motor 6. A compressor body is attached to the gear casing 5, and a suction throttle valve 3 and a filter duct 2 are attached to the upper part of the compressor body. In addition, the intake duct 1 serves as a passage for the air in order to take in compression air from the outside into the filter duct 2.
Is connected. Also, the entire compressor is common base 1
6. The motor base 7 is covered with a package 9, and a ventilation fan 8 for ventilation of the package 9 is attached to the motor base 7.

When the compressor is started, the package 9
The internal air is warmed by the heat radiation from each device. Therefore, it is necessary to ventilate the air inside the package so that the maximum usable temperature of each device is not exceeded. In the conventional technique, the ventilation fan 8 is operating during the operation of the compressor to provide ventilation, but when the compressor is stopped, the ventilation fan 8 is operated.
Since it also stopped, ventilation could not be performed and the temperature inside the package 9 had risen.

On the other hand, in the present invention, the ventilation port is provided above the package 9 so that the temperature inside the package 9 does not rise even after the compressor is stopped. As a result, the warmed air rises and is naturally discharged from the ventilation port, so that the temperature rise inside the package 9 after the compressor is stopped can be suppressed.

However, if the package 9 itself is provided with a ventilation port, noise during the operation of the compressor increases. To prevent this, it is necessary to attach a duct to the ventilation port, which increases the number of parts and increases the cost. Problems such as ups occur. In order to solve this problem, it is attached to the upper part of the package in the present invention. A structure in which a ventilation port is provided in the intake duct 1 is adopted. Figure 2 shows this intake duct 1
The structure of is shown.

A partition plate 14 divides the inside of the intake duct 1 into two passages. The intake of compressed air during operation of the compressor is taken into the intake duct 1 from the compressed air intake port 10, passes through the filter duct 2 and the suction throttle valve 3 from the compressed air outlet 13, and is sucked into the compressor body 4. It Ventilation inside the package 9 during the operation of the compressor is performed by operating the ventilation fan 8 provided in the motor base 7 so that the outside air is taken into the intake duct 1 through the ventilation port 11 and the inside of the package 9 through the ventilation hole 12. Is taken into.
Further, after the compressor is stopped, the air warmed by the heat radiation of each device rises and the ventilation hole 12 is located at the upper part, so that it naturally passes through this and is discharged from the ventilation port 11 to the outside of the package 9. . Therefore, it is possible to prevent the temperature inside the package 9 from rising after the operation is stopped. In particular, since the ventilation hole 12 is located above the starter plate 15, it is effective in preventing the temperature rise inside the starter plate 15.

Further, since the sound absorbing material is attached to the inner surface of the intake duct 1, the increase of noise during the operation of the compressor is prevented.

[0015]

According to the present invention, without increasing the number of parts and without increasing the noise value due to the addition of the ventilation port, the temperature inside the package can be increased both during the operation of the compressor and after the stop. Can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a compressor to which the present invention is applied.

FIG. 2 is an explanatory view of an intake duct of the present invention.

[Explanation of symbols]

1 ... Intake duct, 2 ... Filter duct, 3 ... Suction throttle valve, 4 ... Compressor body, 5 ... Gear casing, 6 ... Motor, 7 ... Motor base, 8 ... Ventilation fan, 9 ... Package,
10 ... Compressed air intake port, 11 ... Ventilation port, 12 ... Ventilation hole,
13 ... Compressed air outlet, 14 ... Partition plate, 15 ... Starter board,
16 ... Common base.

Claims (1)

[Claims] 1. A package type screw compressor characterized in that a ventilation port for preventing a temperature rise inside the package after the compressor is stopped is provided in a duct for sucking compressed air by natural ventilation. .