JPS61223277A - Dehumidifier device for compressed air - Google Patents

Abstract

PURPOSE:To carry out the heating and drying of compressed air efficiently by passing the compressed air which has passed an after-cooler through the passageway of exhaust air after cooling the inside of housing in which a compressor is contained, in a package type compressor not provided with a refrigerating cycle. CONSTITUTION:A package type oil-cooled compressor 1 including a housing 10 is driven by an engine 2, and discharges compressed gas containing lubricating oil into a receiver tank 3. In this tank 3 lubricating oil is separated from the compressed gas, and is taken out from the bottom of the receiver tank 3, and then is supplied to the compressor 1 via an oil-cooler 7. To the oil-cooler 7 a radiator 8 is juxtaposed, and also an after-cooler 4 is juxtaposed. In the above, in the vicinity of the exhaust port 11 of the housing 10, an after-warmer 6 is installed in the passageway of exhaust air after cooling the inside of housing 10, and the inlet is communicated to the outlet of compressed gas of the receiver tank 3 via the after-cooler 4.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a dehumidifying device for compressed air in an engine-driven compressor, and more specifically to a package type compressor without a refrigeration cycle, in which the compressor, engine, and other related equipment are housed in a box having outside air intake and exhaust holes. After passing through the aftercooler, which is an air-cooled heat exchanger, the compressed air is saturated and the condensed water is removed. Relating to a dehumidifying device for compressed air without a refrigeration cycle in an engine-driven compressor that can heat the air by exchanging heat with wind and supply air that is sufficiently dry to the extent that no moisture condensation occurs in a practical range of low relative humidity. .

[Prior art and problems]

Conventionally, this type of compressed air dehumidification equipment is configured to separate dust and oil mist after separating the condensate from the compressor and send it to a dryer, which includes: - a fire heat exchanger, a secondary heat exchanger; In the secondary heat exchanger, the compressed gas is heat exchanged with a low-temperature refrigerant gas to become a low-temperature, dehumidified, saturated compressed gas, which is then introduced into the primary heat exchanger again. In this fire heat exchanger, the high-temperature compressed gas introduced into the dryer is obtained by heat exchange between the high-temperature compressed gas introduced into the dryer and the low-temperature compressed gas cooled by the secondary heat exchanger consisting of the above-mentioned refrigerator. This is what we are trying to do. As mentioned above, such conventional equipment requires a secondary heat exchanger consisting of an aftercooler, a drain separator, and a refrigerator, and a dryer having a fire heat exchanger, etc. It becomes complicated and large, and as a result, the compressor unit itself becomes large as a whole, making it impossible to downsize the entire device, which inevitably results in an expensive and complicated middle pipe ring, which also results in high running costs, etc. It had the following drawbacks. In addition, the compressed air used for toilet purposes should be heated to a usable limit specific temperature and have a low relative humidity, but the heat medium in the above primary heat exchange term is the cooled discharge air after passing through the aftercooler. The temperature was inevitably low, making it impossible to obtain a sufficient dehumidifying effect through heating. Therefore, a method has been proposed in which the primary heat exchanger in the dryer is provided on the discharge side of the compressor, the discharged air is cooled by a secondary heat converter consisting of a refrigerator in the dryer, and then reheated by the fire heat exchanger. According to this, it is possible to reheat at a high temperature using a fire heat exchanger, but since a dryer with a secondary heat exchanger consisting of a refrigerator is essential, equipment costs, The problems of maintenance, running costs and equipment space were not solved, it was difficult to make it into a portable package type, and there remained the disadvantage that the burden on the refrigerator increased. In addition, as in Utility Model Application No. 55-154387, the compressed air dehumidified by the refrigeration cycle is condensed by the atmosphere introduced by the cooling fan of the condenser in the refrigeration cycle.
There is also a method of heating the book with a heater installed near the book, but it has the drawback of using a refrigeration cycle, and the above-mentioned atmosphere is too hot to be used as a heating medium for compressed air. In order to widen the difference from the dew point temperature by heating, sufficient cooling is required, which increases the load on the refrigerator and cannot be made compact, leaving problems such as being unable to be applied to so-called package-type compressors. Met.

【the purpose】

The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and it does not require special means to obtain a package type without a refrigeration cycle (the engine as a drive source for the compressor, which was conventionally simply discarded). We focus on heating and drying compressed air by effectively utilizing the waste heat discharged from the air, thereby reducing the relative humidity and widening the difference from the dew point temperature to prevent condensation of moisture in the pipes and air tools in practical use. At the same time, we provide compressor dehumidification equipment that can
This dehumidifier is housed in a single package together with other equipment such as the engine-driven compressor, as a unit.
The purpose of this invention is to provide an innovative dry air supply compressor unit that is movable regardless of the installation location.

[Structure] The structure of the present invention for achieving the above object will be explained based on the illustrated embodiment. Air-cooled heat exchange number r> G, heat exchange rate -
A box body 1 with external air intake and exhaust holes for a compressor and related equipment that are directly connected to and driven by the engine 2.
In a package compressor not equipped with a refrigeration cycle stored in a box body, the compressed air after passing through the aftercooler 4 is passed through a pipe line 6 to the passage path of the exhaust air after cooling inside the box body, and the exhaust air is combined with the exhaust air. It is characterized by exchanging heat and heating and drying compressed air. Therefore, the compressed air is introduced into the aftercooler 4, which is an air-cooled heat exchanger, and is cooled at the core to reach a saturated state. Next, the Ir! ! : The compressor 1, engine 2, and other related equipment inside the box 10 were cooled. It exchanges heat with the heated exhaust air of t&, is heated and dried, and is discharged as service air. [Example] The details of the present invention will be explained below based on the illustrated example. In the diagram, `` is air piping, ÷ is lubricating oil piping,
÷ indicates the direction of cooling water piping and flow. The diagram also shows a so-called package type (soundproof type) oil-cooled compressor in which an engine-driven oil-cooled compressor and related equipment are housed in a box body having outside air intake and exhaust holes. This compressor is directly connected to a water-cooled engine 2, and this engine 2 is equipped with a radiator 8 and a fan 9.
As a result, the engine is cooled by the cooling water circulating between the radiator 8 and the engine 2. On the other hand, a receiver tank 3 is connected to the discharge port of the compressor 1, and the lubricating oil discharged together with the compressed gas is separated by a separator (not shown) provided in the receiver tank 3, and the lubricating oil is released from the bottom of the receiver tank 3. The gas is sent to the oil cooler 7 via a pipe, cooled by the oil cooler 7, and then injected and supplied again to the compression chamber in the compressor 1. After being lubricated, sealed, and cooled in the compression chamber, the discharged gas is again discharged. Together with this, it is discharged to the receiver tank 3 and used for circulation. This oil cooler 7 is installed in parallel with the radiator 8, and
An aftercooler 4 that communicates with the compressed gas outlet of the receiver tank 3 via a conduit is arranged in parallel with the oil cooler. Oil cooler 7, aftercooler 4 is radiator 8
Similarly, it is air-cooled by a fan 9. The compressor 1 and related equipment such as the engine are housed in a box 10 having an intake hole 12 and an exhaust hole 11 for outside air. Then, near the exhaust hole 11 of the box body 10, an after-warmer 6 is provided in the passage path of the exhaust air after cooling inside the box body 10,
The flow path inlet of this after-heater 6 communicates with the compressed gas outlet of the receiver tank 3 via a pipe through an after-cooler 4 consisting of an air-cooled heat exchanger. In the embodiment of the present invention, only a negative flow path is formed in the aftertuber 6. Outside air is introduced from the intake hole 12 of the box body 10 by the fan 9 of the radiator 8 or a ventilation fan (not shown), and is discharged from the exhaust hole 11 to ventilate the inside of the box body.
This is designed to prevent the temperature inside the box from rising due to heat generated from equipment such as the engine 2 or the compressor 1. In addition, 15 indicates a fuel tank, and 5 is a drain trap, which is provided by branching the pipe between the inlet of the secondary flow path of the aftercooler 4 and the oil absorber 6, and the water condensed in the compressed air after passing through the aftercooler 4 is removed. are separated. Note that 14 is an air cleaner provided at the suction port of the compressor. Next, the operation will be described. Compressed air is separated from lubricating oil by a separator in the receiver tank 3, introduced into an aftercooler 4 consisting of an air-cooled heat exchanger, and cooled at the core to reach a saturated state. Next, the saturated compressed air is separated from condensed water by the drain trap 5, and is then sent to the entrance of the primary flow path of the absorber heater 6, which is provided in the passage of the exhaust air, near the exhaust hole 11. Ventilate the inside of the body to approximately 60℃ to 80℃
It converts heat into the high-temperature exhaust air, heats and dries it, and discharges it from the outlet of the next flow path as service air.

【effect】

As detailed above, the compressed air dehumidifier according to the present invention has an aftercooler consisting of a receiver tank that communicates with the discharge port of the compressor and an air-cooled heat exchanger that communicates with the compressed air outlet of the receiver tank. In a compressor without a refrigeration cycle, in which a compressor directly connected to the engine and related equipment are housed in a box body having outside air intake holes and exhaust holes, after cooling inside the box body, The compressed air after passing through the aftercooler is passed through a pipe in the exhaust air path, exchanging heat with the exhaust air, and heating and drying the compressed air. The high-temperature waste heat medium, that is, the exhaust heat generated from the compressor, engine, and other related equipment inside the box, is cooled and exchanged with the exhaust air when discharged outside the box, and is heated and dried, so a special heat source is used. Or, without using special means to obtain a heating medium without requiring a large-scale heat exchange system, waste heat emitted from compressors, engines as drive sources, and other related equipment, which were previously simply discarded, can be used. By using it effectively, it is possible to lower the relative humidity of compressed air and widen the difference between it and the dew point temperature, thereby preventing moisture from condensing in practical pipes and in air tools. In addition, since the waste heat medium itself is high temperature, the means for heating the compressed air itself can be small, so together with the aftercooler consisting of an air-cooled heat exchanger, it has a compact and inexpensive configuration.This allows extremely dry compressed air to be obtained. Furthermore, the dehumidifier is housed in a single package with other equipment such as an engine-driven compressor, making it a revolutionary dry air supply compressor that can be moved regardless of the installation location. unit can be provided, and its practical effects are great.

[Brief explanation of drawings]

The figure is a schematic diagram showing an embodiment of the invention.

Claims (1)

[Claims] It has an aftercooler consisting of a receiver tank communicating with the discharge port of the compressor and an air-cooled heat exchanger communicating with the compressed air outlet of the receiver tank, and is directly connected and driven by the engine. In a package compressor without a refrigeration cycle in which a compressor and related equipment are housed in a box body having outside air intake holes and exhaust holes, the compressor after passing through the aftercooler is provided in the passage path of the exhaust air after cooling inside the box body. A compressed air dehumidification device characterized in that air is passed through a pipe to exchange heat with the exhaust air and heat and dry the compressed air.