JP2003301776A - Drain treating device of air compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain treating device for an air compressor where the investment in the equipment is lessened and the running costs is suppressed. <P>SOLUTION: The drain treating device for the air compressor A includes a separator unit 10 to separate the oil component in the drain from the air compressor A, and an evaporator unit 20 is connected with the separator unit 10. The evaporator unit 20 allows the treated drain from the separator unit 10 to evaporate in an exhaust duct M for the cooling air of the compressor A. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain treatment device for an air compressor which can reduce equipment investment and running costs.

[0002]

2. Description of the Related Art An air compressor installed in a factory has a dryer, an air filter, and a receiver tank, for example, on the compressed air sending side, and can stably supply clean compressed air in a dry state. The drain generated by the condensation of water in the compressed air is discarded outside the factory through the drain piping facility.

On the other hand, the oil injection type screw type air compressor which has been popularized in recent years is 150
Drain containing a large amount of oil of about 300 ppm is generated. Therefore, in such a drain, for example, an adsorbent that adsorbs oil must be installed in a drain piping facility to separate the oil and dispose of it outside the factory.

[0004]

According to such a prior art, the drain piping equipment needs to be laid from the air compressor to the outside of the factory, and the adsorbent is frequently renewed and discharged to the outside. There was a problem that the equipment cost and running cost tended to be excessive because the water quality had to be monitored.

Therefore, in view of the above problems of the prior art, the object of the present invention is to provide a separation unit for separating and processing the oil content of the drain and an evaporation unit for evaporating the processed drain into the exhaust duct, thereby providing a facility. An object of the present invention is to provide a drain treatment device for an air compressor that can reduce the investment and the running cost.

[0006]

The structure of the present invention for achieving the above object comprises a separation unit and an evaporation unit connected to the separation unit, and the separation unit comprises an oil content of drain from an air compressor. Is separated by a difference in specific gravity, and the evaporation unit evaporates the processed drain from the separation unit into the exhaust duct for the cooling air of the air compressor.

The separation unit is composed of first and second processing tanks connected in series, and the second processing tank can separate the oil content of the drain into coarse particles through a permeation type filter. .

The second processing tank has a second
A sub-tank that communicates with the first processing tank may be additionally provided, or the sub-tank may be formed integrally with the second processing tank.

Further, the treated drain may be sent to the evaporation unit using the compressed air from the air compressor.

The evaporation unit can be installed in the exhaust duct and can include a fibrous evaporation auxiliary material and a water supply member for supplying treated drain to the evaporation auxiliary material.

[0011]

According to the structure of the present invention, the separation unit separates the oil component of the drain from the air compressor by the difference in specific gravity, and the evaporation unit evaporates the processed drain from the separation unit into the exhaust duct. The piping equipment for the drain is shortened to the length from the air compressor to the exhaust duct, the air compressor can be installed anywhere in the factory, and the cooling air temperature from the exhaust duct can be lowered. it can. Note that the drain from the air compressor refers to a drain discharged from a dryer, a receiver tank, or the like by condensing water in the compressed air from the air compressor. In addition, the treated drain shall have an oil content of about 5 ppm or less removed by a separation unit.

The first processing tank separates the oil component of the drain into the upper portion due to the difference in specific gravity, and the second processing tank coarsens the oil component of the drain from the first processing tank through the filter to obtain the difference in specific gravity. To separate the oil. That is, the separation unit can send the treated drain, from which the oil content has been sufficiently removed through the two-stage separation treatment by the first and second treatment tanks, to the evaporation unit.

The sub-tank attached to the upper part of the second processing tank temporarily stores the oil-rich drainage accumulated in the upper part of the second processing tank and returns it to the first processing tank to re-separate the oil. be able to.

If the sub-tank is formed integrally with the second processing tank, the separation unit can be made more compact.

The separation unit uses the compressed air from the air compressor to send the treated drain to the evaporation unit, so that it is not necessary to use a special pump for water supply.

If the evaporation unit is installed in the exhaust duct, the high temperature cooling air flowing in the exhaust duct is used to
The treated drain can be evaporated in the exhaust duct most efficiently.

In the evaporation unit in which the fibrous evaporation auxiliary material and the water supply member are combined, the processed drain is impregnated into the evaporation auxiliary material through the water supply member, and the high temperature cooling air in the exhaust duct is used as the evaporation auxiliary material. By contacting, the treated drain can be evaporated very efficiently.
As the evaporation aid, for example, an air filter material made of a hydrophilic synthetic fiber non-woven fabric can be used.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

The drain treatment device of the air compressor comprises a separation unit 10 and an evaporation unit 20 (FIG. 1). The drain treatment device is used for an air-cooling type air compressor A having an exhaust duct M for cooling air, and the air compressor A discharges high-temperature cooling air to the outside via the exhaust duct M (see the same figure). Arrow direction).

The separation unit 10 is constructed by cascading first and second processing tanks 11 and 12. An upward baffle plate 11a is provided upright on the bottom of the first processing tank 11, and drain from the air compressor A is supplied downward to a position lower than the baffle plate 11a via a check valve 11b. (Direction of arrow Kd in FIG. 1).

On the upper part of the first processing tank 11, for oil,
The level sensors 11d and 11c for water are mounted above and below, and the on-off valve 1 is provided between the level sensors 11c and 11d.
A discharge pipe 11e with 1e1 is attached. Compressed air for operation from the air compressor A is supplied to the upper end of the first processing tank 11 via an on-off valve 11f (direction of arrow Ka in the figure), and a safety relief valve 11g is attached. ing.

The second processing tank 12 has a smaller cross-sectional area than the first processing tank 11 and is installed at the same height as the first processing tank 11. The second processing tank 12 is internally provided with a permeation-type filter 13 that allows water and oil to permeate therethrough.
Is connected to the lower portion of the processing tank 11. However, in the first processing tank 11, the supply position of the drain from the air compressor A and the connection position of the filter 13 are isolated via the baffle plate 11a. A strainer 12g1 and an opening / closing valve 1 are provided below the second processing tank 12.
The water pipe 12g having 2g2 is connected, and the water pipe 12g
Are connected to the evaporation unit 20.

A sub-tank 14 is integrally formed on the second processing tank 12 with a partition plate 12a interposed therebetween. The partition plate 12a is installed at a height slightly lower than the level sensor 11c for water in the first processing tank 11. The sub-tank 14 communicates with the second processing tank 12 via a check valve 14a flowing from the second processing tank 12 side to the sub-tank 14 side, and communicates with the first processing tank 11 via an opening / closing valve 14b. It is connected. However,
The sub-tank 14 side of the opening / closing valve 14b is sufficiently close to the partition plate 12a, and the first processing tank 11 side is opened downward at a position lower than the level sensor 11c for water. Also,
The upper ends of the sub tank 14 and the first processing tank 11 are substantially at the same height and are connected to each other via an air vent opening / closing valve 14c.

The evaporation unit 20 has a thickness of several mm to several 1
It is configured by combining a 0 mm fibrous evaporation aid 21, a water supply member 22 made of a perforated pipe material, and a fixed frame 23 (FIGS. 1 and 2). Fixed frame 23
Can combine the inwardly facing channel materials in a frame shape and detachably hold the outer periphery of the thick sheet-shaped evaporation auxiliary material 21 of the same shape through the pair of rods 23d, 23d ... On both sides. The water supply member 22 is housed in the upper portion of the fixed frame 23, and the water supply pipe 12g from the separation unit 10 is connected to it. The evaporation unit 20 has a fixed frame 23.
23a, 23a, set screws 23c, 2 on the bottom surface of the
It is installed upright in the exhaust duct M substantially parallel to the flow direction of the cooling air in the exhaust duct M via the 3c.
A drain pipe 23b is attached to the lower surface of the fixed frame 23 and extends below the exhaust duct M.

The drain treatment device of such an air compressor operates as follows.

In the operating state of the air compressor A,
The separation unit 10 opens the on-off valves 14b and 14c and closes the on-off valves 11e1, 11f and 12g2 and stands by (time t ≧ t1 in FIG. 3, hereinafter simply referred to as t ≧ t1). However, in FIGS. 1 and 3, reference symbols Ld1 and Ld
do indicates the liquid level of the drain and oil in the first processing tank 11, and the symbols Ld2 and Ld4 indicate the second level, respectively.
3 shows the liquid level of the drain in the processing tank 12 and the sub tank 14 of FIG. At this time, the internal pressures of the first and second processing tanks 11 and 12 and the sub-tank 14 are controlled by the opening / closing valve 14
b, 14c and the check valve 14a become equal pressure, and the drain from the air compressor A sent through the check valve 11b is stored in the first processing tank 11 and also the check valve 13a and the filter. Second processing tank 1 through 13
It is also stored in 2. Therefore, the first and second processing tanks 1
Nos. 1 and 12 can separate the oil content of the drain stored inside by the difference in specific gravity.

The baffle plate 11 of the first processing tank 11
The a prevents the oil content of the drain from the air compressor A and the foreign matters such as sludge from flowing out to the second processing tank 12 side without being separated. Also, filter 1
3 coarsens fine oil particles in the drain from the first processing tank 11 to improve the efficiency of oil separation processing by the second processing tank 12.

The second treatment tank 12 is filled with water by the drain, and the level sensor 1 for water in the first treatment tank 11 is filled.
When 1c operates (t = t2), the on-off valves 14b and 14c
Is closed to open the on-off valve 11f, and compressed air for operation from the air compressor A is introduced into the first processing tank 11 to pressurize the first processing tank 11. Therefore, drainage in the first processing tank 11 is caused by the check valve 13a and the filter 13
And is pressure-fed into the second processing tank 12 through (t2 <t
<T3), the upper layer portion of the drain in the second processing tank 12 is sent to the sub tank 14 as a drain containing oil through the check valve 14a. Further, the liquid level Ld4 of the drain in the sub tank 14 at this time is smaller than that of the drain in the first processing tank 11 because the cross-sectional area of the second processing tank 12 and the sub tank 14 is smaller than that of the first processing tank 11. It becomes sufficiently higher than the liquid level Ld1.

When the pressurization time of the first processing tank 11 exceeds the set time (t = t3), it is confirmed that the level sensor 11c has stopped operating, and then the on-off valve 11f is closed to open the on-off valve 14.
Open b, 14c and 12g2. Therefore, the lower layer portion of the drain in the second processing tank 12 is supplied to the water supply member 22 of the evaporation unit 20 as a processed drain through the water supply pipe 12g by the internal pressure of the first and second processing tanks 11 and 12. Water is sent (t3 <t <t4) and at the same time, the sub tank 14
The drain inside is returned to the first processing tank 11 via the on-off valve 14b.

The treated drain from the separation unit 10 is supplied from the water supply member 22 to the evaporation auxiliary material 21 and impregnated in the evaporation auxiliary material 21 in the evaporation unit 20.
Therefore, the evaporation assisting material 21 can contact the high temperature cooling air in the exhaust duct M to evaporate the treated drain into the exhaust duct M and discharge it to the outside as low temperature cooling air. The excess drain discharged from the drain pipe 23b may be collected in a suitable container and discarded, or may be returned to either the first or second processing tank 11 or 12.

When the treated drain is sent to the evaporation unit 20 for a set time (t = t4), the on-off valve 12g2
Is closed, the on-off valves 14b and 14c are opened to return to the standby state, and thereafter, the same operation is repeated (t4 <t <t5
). On the other hand, during this period, the liquid level Ldo of the oil in the first processing tank 11 gradually increases as the separation process proceeds, and the level sensor 11d for oil is activated by the returning operation of the drain from the sub tank 14, for example. (T = t5). In that case, the on-off valves 11f, 14b,
14c and 12g2 are closed and the on-off valve 11e1 is opened, and the oil content in the first processing tank 11 is discharged to the outside through the discharge pipe 11e (t5 <t <t6). When the oil is completely discharged (t = t6) due to the elapse of the set time, the on-off valve 11e1
Is closed and the opening / closing valves 14b and 14c are opened to return to the original standby state, and thereafter, the same operation is repeated, and the drain from the air compressor A can be continuously processed.

[0032]

Other Embodiments In the exhaust duct M, two evaporation units 20, 20 may be installed side by side (FIG. 4).
It is preferable that the evaporation units 20 and 20 are arranged in parallel with each other and inclined with respect to the flow of the cooling air in the exhaust duct M (the direction of the arrow in the figure) by an inclination angle θ of about 0 to 20 °. Evaporation auxiliary material 21 of each evaporation unit 20 with inclination angle θ ≠ 0 °
The one surface, which is diagonally opposed to the upstream side of the cooling air, serves as a heating surface and the other surface serves as a vaporization surface, so that the treated drain can be more efficiently evaporated. However, the evaporation units 20 may have two or more surfaces arranged side by side in a direction crossing the flow of the cooling air, or may have two or more surfaces arranged in one or two or more columns in the cooling air flow direction. Good. It should be noted that the plurality of evaporation units 20, 20, ... Have a water supply pipe 12 so that the treated drain from the separation unit 10 is evenly distributed.
shall be properly connected to g.

The evaporation unit 20 is detachably mounted in a box-shaped fixed frame 23 whose upper surface and four side surfaces are open so that a thin sheet-shaped evaporation auxiliary member 21 is folded back from left to right. Can be done (Fig. 5). However,
(A) and (B) are the partially broken perspective view of the evaporation unit 20, and the vertical cross-sectional view of a short side direction.

A water supply member 22 is attached to one upper long side of the upper portion of the fixed frame 23 via an auxiliary frame 23f. On the other hand, the evaporation auxiliary material 21 is the auxiliary frame 23.
The upper end is fixed directly below the water supply member 22 via a holding plate 21a screwed to the lower surface of f, and alternately hung over rods 23e, 23e ... Attached to the left and right of the fixed frame 23, and another holding plate 21a The lower end is fixed to the bottom plate 23g of the fixed frame 23 via. The bottom plate 23g is
It is formed on a shallow plate with a drain pipe 23b. If the long side direction of the fixed frame 23 is installed so as to match the flow of the cooling air in the exhaust duct M (the direction of the arrow in FIG. 5A), the effective area of the evaporation assisting material 21 in contact with the cooling air can be made extremely large. it can.

The evaporation auxiliary material 21 of the evaporation unit 20 can be detachably fixed directly to the inner surface of the exhaust duct M instead of using the fixed frame 23 (FIG. 6). However, FIGS. 6A and 6B show the evaporation unit 2 respectively.
0 is an exploded perspective view of FIG. 0, and is an enlarged cross-sectional view taken along line YY of FIG.

The water supply member 22 includes hook fittings 22a, 22
is fixed to the upper part of the inner surface of the exhaust duct M via a,
The evaporation assisting material 21 is fixed to the inner surface of the exhaust duct M by attaching the pressing members 24a, 24a ... to the needle pins 24b, 24b. Has been done. The evaporation aid 21
Is supported by a stopper plate 24c fixed downward on the top surface of the exhaust duct M, and the lower end of the evaporation assisting material 21 is suspended in a gutter 27 having a drain pipe 23b.

The water supply member 22 shown in FIGS. 2, 5 and 6 may be formed in a gutter shape having notches 22b, 22b ... In place of the perforated pipe material (FIG. 7). However, FIG. 7 illustrates the water supply member 22 of FIG. 5. The processed drain from the water supply pipe 12g overflows through the notches 22b, 22b ... And is supplied to the evaporation auxiliary material 21, so that the water supply member 22 is not clogged.

In the above description, the sub tank 14 is
The second processing tank 1 is provided separately from the second processing tank 12.
2 or the second processing tank 12
It may be higher and may be installed away from the second processing tank 12. In addition, the separation unit 10 performs a water supply operation of supplying the treated drain to the evaporation unit 20, and the sub tank 1
Instead of simultaneously performing the return operation for returning the drain inside the first processing tank 11, the on-off valve 12g2 and the on-off valve 1
4b and 14c may be opened separately, and the water supply operation and the water return operation may be executed in time series.

The drain treatment apparatus according to the present invention can be particularly preferably used for an air-cooling type oil injection type screw type air compressor, and also an air compressor of any type such as a rotary type, a scroll type and a reciprocating type. Can also be used for

[0040]

As described above, according to the present invention, by connecting the evaporating unit to the separation unit for separating the oil content of the drain, the separation unit is completely free of consumables such as oil adsorbent. Since the evaporation unit can evaporate the treated drain into the exhaust duct without the need, it has an excellent effect that the running cost can be suppressed, the piping equipment can be minimized, and the equipment investment can be suppressed.

[Brief description of drawings]

[Fig. 1] Schematic diagram of overall configuration

FIG. 2 is an exploded perspective view of an evaporation unit.

FIG. 3 is an operation explanatory diagram of the separation unit.

FIG. 4 is an enlarged transverse cross-sectional view of a main part showing another embodiment.

FIG. 5 is an enlarged configuration explanatory diagram (1) of a main part showing another embodiment.

FIG. 6 is an enlarged configuration explanatory diagram (2) of a main part showing another embodiment.

FIG. 7 is an enlarged perspective view of an essential part showing another embodiment.

[Explanation of symbols]

A ... Air compressor M ... Exhaust duct 10 ... Separation unit 11 ... First processing tank 12 ... Second processing tank 13 ... Filter 14 ... Sub tank 20 ... Evaporation unit 21 ... Evaporation aid 22 ... Water supply member

Claims (7)

[Claims] 1. A separation unit and an evaporation unit connected to the separation unit, wherein the separation unit separates the oil content of the drain from the air compressor by a difference in specific gravity, and the evaporation unit includes the separation unit. A drain treatment device for an air compressor, characterized in that the treated drain from the unit is evaporated into an exhaust duct for cooling air of the air compressor. 2. The separation unit is formed by cascading first and second processing tanks, and the second processing tank is configured to coarsen and separate the oil content of the drain through a permeation type filter. The drain treatment device of the air compressor according to claim 1. 3. The air according to claim 2, wherein a sub-tank communicating with the second processing tank and connected to the first processing tank is attached to an upper portion of the second processing tank. Drain processing device of compressor. 4. The drain treatment device for an air compressor according to claim 3, wherein the sub-tank is formed integrally with the second treatment tank. 5. The air compressor according to claim 1, wherein the separation unit uses the compressed air from the air compressor to send the treated drain to the evaporation unit. Drain processing equipment. 6. The drain treatment device for an air compressor according to claim 1, wherein the evaporation unit is installed in an exhaust duct. 7. The drain treatment of an air compressor according to claim 6, wherein the evaporation unit includes a fibrous evaporation auxiliary material and a water supply member for supplying a processed drain to the evaporation auxiliary material. apparatus.