JPS61223278A - 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 path of exhaust heat medium through which the exhaust gas of an engine passes, in a package type compressor not provided with a refrigerating cycle. CONSTITUTION:A package type oil-cooled compressor 1 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 which cools the compressed gas is juxtaposed. In the above, an after-warmer 6 is installed in the exhaust muffler 13 provided in the exhaust system of an engine 2, 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, and the compressed air is heated by exchanging heat with exhaust gas, which is a heated waste heat medium, that passes through the exhaust passage of the engine. The present invention relates to a dehumidifying device for compressed air without a refrigeration cycle in an engine-driven compressor that can supply air that is sufficiently dry to the extent that moisture condensation does not occur in a practical range of low relative humidity.

[Prior art and problems]

Conventionally, this type of compressed air dehumidification device is configured to cool the discharged air with an aftercooler provided on the discharge side of the compressor, and after separating the drain, dust and oil mist are separated and sent to the dryer. This dryer includes - a fire heat exchanger;
It consists of a secondary heat exchanger (refrigerator). In the secondary heat exchanger, the compressed gas is heat exchanged with low-temperature refrigerant gas to become a low-temperature, dehumidified, saturated 1-pressure m* body, and then introduced into the primary heat exchanger again. be done. In this secondary heat exchange story, we will obtain the high-temperature compressed gas introduced into the dryer 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. It is something that is. 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 secondary heat exchanger. 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, inevitably making it expensive and complicated to maintain, and furthermore, running costs become expensive. It had drawbacks. In addition, the compressed air to be used should be heated to a usable limit and have a low relative humidity, but the heat medium in the above-mentioned primary heat exchanger is the cooled discharge air after passing through the aftercooler. The temperature was so low that a sufficient dehumidifying effect by heating could not be obtained. Therefore, the above-mentioned primary heat exchanger in the dryer is provided on the discharge side of the compressor, and the discharged air is cooled by a secondary heat exchanger consisting of a refrigerator in the dryer, and then reheated by the secondary heat exchanger. According to this proposal, it is possible to reheat at a high temperature with a fire heat exchanger, but since a dryer with a secondary heat exchanger consisting of a refrigerator is essential, the equipment The problems of costs, maintenance, running costs, and equipment space remain unsolved, and it is difficult to create a portable package type, and there remains the disadvantage that the burden on the refrigerator increases. In addition, as in Utility Model Application No. 55-154387, there is a method in which the compressed air dehumidified in the refrigeration cycle is heated by the air introduced by the cooling fan of the condenser in the refrigeration cycle, using a heater installed near the condenser. However, since a refrigeration cycle is used, the configuration consisting of the refrigerator has disadvantages, and the temperature of the atmosphere is low enough to be used as a heating medium for compressed air, and heating widens the difference from the dew point temperature. Sufficient cooling is required to
The load on the refrigerator increases and it cannot be made more compact.
First, there remain problems such as the inability to apply the pressure WJmt of a so-called package type.

【the purpose】

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology. We focused on heating and drying compressed air by making effective use of the waste heat emitted from the engine that drives the compressor, which had previously been simply discarded.We lowered the relative humidity and widened the difference with the dew point temperature, making it easier to use in practical piping. In addition, the present invention provides a dehumidifying device for a compressor that can prevent moisture condensation in an air tool, and at the same time provides a unit in which this dehumidifying device is housed in one package together with the engine-driven compressor, etc. The purpose of this invention is to provide an innovative dry air supply compressor unit that is movable regardless of the installation location.

【composition】

The structure of the present invention for achieving the above object will be explained based on the illustrated embodiment. The receiver tank 3 communicates with the discharge port of the compressor 1, and the air-cooled receiver tank 3 communicates with the compressed air outlet of the receiver tank 3. A packaged compressor without a refrigeration cycle, which has an aftercooler 4 consisting of a heat exchanger, and a compressor directly connected to and driven by the engine 2 and related equipment housed in a box body having outside air intake and exhaust holes. The compressed air after passing through the aftercooler is passed through the pipe line 6 into the path 13 of the waste heat medium, which is the high-temperature exhaust gas passing through the exhaust passage of the engine, to the waste heat)
It is characterized by heating and drying compressed air by exchanging heat with a heat medium consisting of: Therefore, the compressed air is introduced into the air-cooled heat exchanger 4, where it is cooled at the core and brought to a saturated state. Next, the air is fed to the pipe ls6, where it exchanges heat with the high-temperature exhaust gas of the engine 2, is heated and dried, and is discharged as service air.

[*Example]

Hereinafter, details of the present invention will be explained based on illustrated embodiments. In addition, in the diagram, the value is air piping, ÷ is lubricating oil piping,
◆ indicates cooling water piping, ÷ indicates engine exhaust piping and flow direction. The figure shows a so-called package type (soundproof type) oil-cooled compressor housed in a box body having air intake holes and exhaust holes. Reference numeral 1 denotes an oil-cooled compressor, which is directly connected to and driven by a water-cooled engine 2. includes a muffler 13 and a radiator 8, and is cooled by cooling water that circulates between the radiator 8 and the engine 2 by a fan 9. - Ten thousand, pressure! A receiver tank 3 is connected to the outlet of the mail, and a separator (not shown) installed in the receiver tank 3 discharges the lubricating oil together with the pressure m gas. The oil is sent to the oil cooler 7 via a pipe, cooled in the core, and then injected and supplied again to the pressure chamber 111 in the compressor 1. After lubricating, sealing, and cooling that part, it is sent to the receiver tank together with the discharged gas again. 3 and used for circulation. The oil cooler 7 is arranged in parallel with the radiator 8, and an aftercooler 4 is arranged in parallel with the oil cooler 7, which communicates with the compressed gas outlet of the receiver tank 3 via a pipe. Like the radiator 8, the oil cooler 7 and the aftercooler 4 are air-cooled by a fan 9. The above-mentioned compressor 1 and related equipment such as the engine are housed in a box body (not shown) that has an intake hole and an exhaust hole for outside air, and outside air is introduced through the intake hole by a fan 9 of the radiator 8 or a ventilation fan (not shown), and then exhausted. The air is discharged from the hole to ventilate the inside of the box to prevent the temperature inside the box from rising due to heat generated from equipment such as the engine 2 or compressor 1. The aftercooler 6, which constitutes a heat exchanger that communicates with the compressed gas outlet of the receiver tank 3 via the aftercooler 4, which is an air-cooled heat exchanger, is provided in the exhaust muffler 13, which is the exhaust passage of the engine 2. ing. It goes without saying that the above embodiment can also be applied to a water-type engine-driven compressor having a radiator 8. In addition, 15 indicates a fuel tank, and 5 is a drain trap, which is provided by branching the pipe line between the inlets of the flow paths of the aftercooler 4 and the aftercooler 6, and the condensed moisture in the compressed air after passing through the aftercooler 4 is separated. be done. Further, 14 is an air cleaner provided at the suction port of the compressor. Next, the operation will be described. The compressed air is separated from the lubricating oil by a separator in the receiver tank 3, and introduced into the aftercooler 4, which is an air-cooled heat exchanger, where it is cooled at the core and becomes saturated. Next, the saturated compressed air is separated from condensed moisture by a drain trap 5, and then passed to an after-warmer 6 provided in an exhaust muffler 13, which is an exhaust passage of the engine 2.
When the compressed gas passes through the muffler 13, it exchanges heat with the exhaust gas of the engine at a temperature of approximately 400°C to 550°C, is heated and dried, and is sent to the flow path of the after-heater 6 as service air. be ejected from the exit.

【effect】

As described in detail above, the compressed air dehumidification device according to the present invention includes a receiver tank that communicates with the discharge port of the compressor, and an aftercooler that includes an air-cooled heat exchange device that communicates with the compressed air outlet of the receiver tank. In a package-type compressor without a refrigeration cycle in which a compressor and related equipment directly connected to the engine and related equipment are housed in a box with intake and exhaust holes for outside air, the air passes through the exhaust passage of the engine. The compressed air after passing through the aftercooler is passed through a pipe line in the path of the high-temperature waste heat medium, and the compressed air is heated and dried by exchanging heat with the heat medium made of the waste heat, The aftercooler exchanges heat with saturated compressed air with the high-temperature waste heat medium, or exhaust gas, and heats and dries it, so a special heat exchanger is used to obtain the heating medium without the need for a special heat source or large heat exchange board. By effectively utilizing the waste heat emitted from the compressor and the engine, which is the drive source, and reducing the relative humidity of the compressed air and widening the difference between the dew point and the It is possible to prevent moisture from condensing in the middle of piping and in air tools. In addition, since the waste heat medium itself is high temperature, the compressed air heating means itself can be small, so it is possible to obtain extremely dry compressed air with a compact and inexpensive structure together with the aftercooler consisting of an air-cooled heat exchange device. In addition, the above dehumidifier is housed in one package along with other equipment such as an engine-driven compressor, creating a revolutionary dry air supply compressor unit that can be moved regardless of the installation location. can be provided, and its practical effects are great.

[Brief explanation of the drawing]

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 packaged compressor without a refrigeration cycle in which the compressor and related equipment are housed in a box having outside air intake holes and exhaust holes, the path of the waste heat medium passing through the exhaust passage of the engine includes:
A dehumidifying device for compressed air, characterized in that the compressed air after passing through the aftercooler is passed through a conduit to exchange heat with a heat medium made of the waste heat, thereby heating and drying the compressed air.