JPH04203384A - oil free screw compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to means effective for preventing rust inside a compressor working chamber in an oil-free screw compressor.

= 1- [Prior Art] Conventional oil-free screw compressors do not take active measures to prevent rust inside the compressor working chamber. This is the main part that makes up the compressor body. Since the pair of male and female rotors and the casing have fairly complex shapes and require high-precision machining, using various types of plating or rust-resistant steel will not be acceptable in the market due to price. The problem is that the conditions are far from being met. As shown in the attached document, the prior art related to the present invention uses a honeycomb dehumidifier to remove moisture from discharged air, but the present technology does not provide any rust prevention inside the compressor working chamber. It has no effect.

[Problem to be solved by the invention]

As in the above-mentioned prior art, the main body of the oil-free screw compressor is very expensive, so no active rust prevention measures are taken.

For this reason, when the compressor is in continuous operation, there are very few conditions for rust to form inside the compressor working chamber, and there is almost no problem, but when the compressor is stopped, rust remains inside the compressor working chamber. Moisture contained in the air condenses on the rotor and casing surfaces, gradually causing rust. When this rust flakes off for some reason, it gets stuck between the rotors rotating at high speed in a minute gap, or between the rotor and the casing, causing many troubles such as locking of the rotor.

An object of the present invention is to provide a highly reliable oil-free screw compressor.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a honeycomb type dehumidifier between the suction filter and the unloader valve of the suction piping system consisting of the suction filter and the unloader valve of an oil-free screw compressor, and removes moisture contained in the suction air. This removes the moisture from the honeycomb dehumidifier and supplies dry air to the compressor to prevent condensation from forming inside the compressor working chamber even when the compressor is stopped. It was designed to be used as a heat source for attachment and detachment.

[Effect]

When the oil-free screw compressor and the honeycomb dehumidifier are operated in the above configuration, atmospheric air passes through the suction filter, dust and other debris are removed, and the air is supplied to the honeycomb dehumidifier. Honeycomb dehumidifiers are rotated at low speed by a motor, and are divided into a passage for adsorbing moisture and a passage for desorbing the adsorbed moisture.
Air sucked in from the atmosphere passes through an adsorption passage, removes most of the moisture, and is supplied to the compressor as dry air.
.

be done. The air supplied to the compressor is compressed in the compressor working chamber, becomes high temperature air, and is discharged. When this high-temperature discharged air is guided into the radiator and a blower is used to send wind, heat exchange occurs with the high-temperature air inside the radiator, so that the air sent by the blower becomes high temperature. If this high-temperature air is guided to the moisture desorption passage of the honeycomb type dehumidifier, the moisture will be adsorbed by the honeycomb type dehumidifier and desorbed, so the oil-free screw compressor will always suck in dry air. Since moisture condensation in the working chamber does not create conditions for rust to occur, as a result, the problems that occurred with the prior art can be solved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In Fig. 1, 1 is an oil-free screw compressor;
2 is an unloader valve, 3 is a suction filter, and 4 is a radiator. The oil-free screw compressor 1 and the radiator 4 are connected by a discharge pipe 5.

6 is a blower. 7 is a honeycomb type dehumidifier, and the honeycomb type dehumidifier 7 is operated at low speed by a motor 9 via a belt 8. The honeycomb dehumidifier 7, the suction filter 3, and the unloader valve 2 are connected through passages 10 and 11 for adsorbing moisture in the suction air. On the other hand, the honeycomb type dehumidifier 7 and the radiator 4 exchange heat with the radiator 4 for the air sent by the blower 6 and guide the high temperature air to a passage 12 for desorbing the moisture adsorbed on the honeycomb type dehumidifier 7. connected with.

With this configuration, when the oil-free screw compressor 1 and the honeycomb dehumidifier 7 are operated, atmospheric air passes through the suction filter 3 and dirt such as dust is removed, and the air passes through the passage 10.
It is supplied to the honeycomb type dehumidifier 7 via. Here, most of the moisture in the suction air is adsorbed and removed, resulting in dry air, which is supplied to the oil-free screw compressor 1 via the passage 11 and the unloader valve 2. Air supplied to the compressor 1 is compressed within the compressor working chamber to a high temperature, and is supplied to the radiator 4 via the discharge pipe 5. The high temperature air supplied to the radiator 4 exchanges heat with the air sent by the blower 6, so the air sent from the blower 6 becomes high temperature and is sent to the honeycomb dehumidifier 7 via the passage 12, where it is adsorbed. The dehumidifier 7 is regenerated by desorbing the moisture contained therein.

In this way, according to this embodiment, the honeycomb dehumidifier 7 can continuously adsorb moisture in the intake air and desorb moisture adsorbed in the dehumidifier 7, so that there is no room in the compressor working chamber. Dry air is always supplied, and as a result, rust due to condensation of moisture in the compressor working chamber can be prevented, so the problems with the prior art can be solved.

〔Effect of the invention〕

According to the present invention, it is possible to constantly supply dry air when operating an oil-free screw compressor, so even when the compressor is stopped, moisture in the compressor operating chamber will condense and rust will occur. Therefore, it is possible to provide a highly reliable oil-free screw compressor.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing one embodiment of the present invention.

Claims (1)

[Claims] 1. In a suction piping system consisting of a suction filter and an unloader valve of an oil-free screw compressor, a honeycomb dehumidifier is provided between the suction filter and the unloader valve, and the honeycomb dehumidifier removes the suction air. The moisture contained in the air is removed to obtain dry air, which is then supplied to the oil-free screw compressor, and the moisture adsorbed by the honeycomb dehumidifier is removed from the high-temperature air compressed by the oil-free screw compressor. An oil-free screw compressor characterized in that it is configured to be attached and detached using a heat source as a heat source.