JPH0118170Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil-water separator, and more particularly, to an apparatus that can efficiently and continuously separate and remove oil from a stock solution.

BACKGROUND ART Conventionally, for example, degreasing liquid containing oil that has been subjected to degreasing treatment in the field of metal surface treatment has been subjected to various oil-water separation treatments and reused. An example of a device used in this case is to let the processing liquid containing oil stay in a tank and let it stand still, heat it to float and separate the oil, and attach the separated oil to a felt-like belt. An example is a device that removes it externally. In a device having such a driving portion, the structure becomes complicated, which is disadvantageous in terms of the device. Furthermore, continuous and efficient treatment cannot be achieved using only the static separation method.

The present invention was devised to solve the above problems, and its gist is that the cross section is concave, and the ceiling of the central concave part slopes upward from one of the rising parts on both sides toward the other. tank, stock solution supply pipe installed in the rising part of one side of the tank,
An open end is installed at a position below the contact point between the inner wall of the rising part and the inclined ceiling in the other rising part of the tank, and is connected to a siphon breaker at a position above and below between the above contact point and the opening part of the separated oil discharge pipe described below. The tank is equipped with an oil separation liquid discharge pipe with an opening part installed above the above-mentioned contact point in the other rising part of the tank, and a heating source installed at the bottom of the tank below the sloping ceiling. The invention resides in an oil-water separator characterized by the following.

Next, the present invention will be specifically explained with reference to the accompanying drawings. Reference numeral 1 is a tank having a concave cross section as shown in the drawings, and the ceiling 2 of the central recessed portion is inclined upward from one side 3 of the rising portions 3 to the other 4 of both sides. Reference numeral 5 denotes a stock solution supply pipe installed in one of the rising portions 3, and the open end thereof is preferably located at the bottom of the rising portion 3. 6 is the rising portion 4 of the other rising portion 4
This is an oil separation liquid discharge pipe installed below the contact point 8 between the inner wall 7 and the inclined ceiling 2. For example, when a discharge pipe 6 structure including a siphon breaker 6' is adopted as shown in the figure, the open end of the pipe 6 rises up at the lower part of the rising part 4, and then bends horizontally at the part where the breaker 6' is connected.
It is sufficient that the horizontal part is located between the contact point 8 and the upper end of the gutter described later, and then curved downward. Reference numeral 9 denotes a separation oil discharge pipe installed above the contact point 8 in the other rising portion 4. The opening part of the tube 9 is formed, for example, in the form of a trough 10, which is located above the contact point 8 in the rising part 4. 11 is a heating source (for example, a steam pipe) installed at the bottom of the tank. It is preferable that the heating body portion be located directly below the ceiling 2.

The tank having the above configuration is attached to, for example, a treatment bath for alkaline degreasing treatment in metal surface treatment. For example, as shown in FIG. 2, a stock solution supply pipe 5 is connected to a pump 22 installed in a bathtub 21, and a discharge pipe 6 is connected to the bathtub 21 as a return pipe for the degreasing liquid from which oil has been removed.

Therefore, the oil-containing degreasing liquid is introduced as a stock solution from the bathtub 21 into one rising portion 3 of the tank 1 via the pipe 5 by the pump 22. The introduced stock solution flows downward through the rising portion 3, and then reaches the passage below the ceiling 2, where it is heated and the oil is separated and floated. Therefore, in order to form a good downward flow in the rising part 3 and to prevent the separated oil from flowing into the part 3, it is advantageous that the passage cross-sectional area of the part 3 is narrow. The oil that separates and floats moves along the slope of the ceiling 2 toward the other rising portion 4, and accumulates in the upper portion of the portion 4 to form an oil layer. On the other hand, the degreasing liquid from which oil has been removed is taken out from the pipe 6 and returned to the bathtub 21. Therefore, the slope of the ceiling 2 needs to be at an angle that allows the oil to move smoothly to the portion 4, and is usually 10 to 20 degrees. If the inclination angle is too small, smooth movement of oil will not be achieved, and if it is too large, the device will become larger, which is disadvantageous. Since the separated oil is guided and moved by the inclination of the ceiling 2 in this way, it is advantageous to position the heating body portion of the heating source 11 directly below the ceiling 2 to separate the oil. The passageway in the tank in the ceiling 2 portion may be long enough to ensure sufficient time for the oil to be separated by heating. For example, when targeting an alkaline degreasing liquid containing oil, the degreasing liquid flows through the passage for a time range of 20 to 30 minutes at a heating temperature of 70 to 80°C at a flow rate of 3 to 5 x 10 ^-2 m/min. The length may be sufficient as long as it can ensure that.

The oil floating and accumulating on the other rising portion 4 overflows the gutter 10 and is discharged to the outside via the pipe 9. In order to efficiently discharge only the oil to the outside, the passage cross-sectional area of the rising portion 4 should be narrowed to increase the thickness of the oil layer even if a small amount of oil floats up and accumulates. is advantageous.

According to the device of the present invention having the above configuration, continuous treatment is possible because the raw solution supplying section and the floating and accumulating section of the separated oil are separated. Also,
Since the structure of the sloping ceiling 2 is adopted, it is possible to guide the separated oil to a predetermined position.
The efficiency of oil separation and removal can be increased.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional perspective view showing an example of the essential parts of the device of the present invention, and FIG. 2 is a simplified cross-sectional view showing an example of the entire device, in which 1 is a tank, 2 is a ceiling, and 3 is one rising portion. , 4 is the other rising part, 5 is the stock solution supply pipe, 6 is the oil separation liquid discharge pipe, 6' is the siphon breaker, 7 is the inner wall of the rising part, 8 is the contact, 9 is the separated oil discharge pipe, 10 is the gutter, 11 indicates a heating source.

Claims (1)

[Scope of utility model registration request] A tank with a concave cross section and a ceiling in the central recessed part that slopes upward from one of the rising parts on both sides to the other, a stock solution supply pipe installed in one rising part of the tank, and the other rising part of the tank An oil separation liquid having an open end installed at a position below the contact point between the inner wall of the rising part and the sloped ceiling, and connected to a siphon breaker at a vertical position between the contact point and the opening part of the separated oil discharge pipe described below. An oily water system comprising: a discharge pipe, a separation oil discharge pipe having an opening portion installed above the contact point in the other rising portion of the tank, and a heating source installed at the bottom of the tank below the sloping ceiling. Separation device.