JPS58180214A - Separating device of oil or the like contained in waste gas - Google Patents

Abstract

PURPOSE:To catch and separate oil, etc. contained in waste gas surely, by arranging impellers for collecting oil by sticking and baffle plates for collecting the oil by collision organically in an exhaust duct so that its oil collecting efficiency is maximum. CONSTITUTION:When a waste gas containing oil mist passes through a grease filter 2 and a device in sequence by the suction of an exhaust fan 8, massive oil particles in the waste gas firstly caught by the grease filter 2 and are gathered in an oil receiver 4. The oil included in the waste gas which has passed through the filter 2 is firstly caught by sticking by the vanes of an impeller 11 and is made to stick to the inner surface of an attached duct 9 by a centrifugal force, and simultaneously, the oil is caught by collision by a baffle plate 14 at the 1st stage, and both of the caught oil fall down along the inner surface of the duct 9 to an oil receiver 17. The remaining oil in the gas is caught by sticking by the vanes of an impeller 12 at the 2nd stage, and is made to stick to the inner surface of the duct 9 by a centrifugal force, and simultaneously the oil is caught by collision by a baffle plate 14 of the 2nd stage, and both of the caught oil fall down along the inner surface of the duct 9 to an oil receiver 17 through an oil discharging port 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for separating oil mist, ink mist, etc. generated in a printing letterpress recycling process from exhaust gas.

Oil in the exhaust gas coming out of the cooking room of a restaurant tends to adhere to the inner surface of the exhaust duct, and this adherent layer can propagate flames and cause a fire. Furthermore, if the oil in the exhaust gas is not separated and removed reliably, a portion of it will adhere to the exhaust fan, and the remainder will be discharged to the outside as is. In this case, the oil discharged to the outside pollutes the environment around the duct outlet. For kitchen exhaust systems in restaurants, etc., some metropolitan areas, prefectures, and prefectures have regulations that require the installation of grease filters or other oil removal devices in the air, especially from the perspective of preventing fires caused by flame transmission within the ducts. It is mandatory.

However, the conventional grease fill 9 has a baffle plate inside a thin box-like body, and when exhaust gas passes through the box-like body, oil particles in the exhaust collide with the baffle plate and are collected. Although it is effective in collecting large amounts of oil particles,
This method was not perfect as an oil separation means in that some of the oil particles or small-mass oil particles flowed into the exhaust duct along with the exhaust flow. Conventionally, the part where oil particles are collided and separated is made larger and the exhaust flow is made to collide with the exhaust stream multiple times to increase the ability to capture oil and fat, and the captured oil and fat are removed using detergent, etc. What you configured (
This method is called a grease extractor), and a method in which a rotating body is installed in the exhaust flow, oil is attached to it, and oil is separated by centrifugal force (Japanese Patent Laid-Open No. 55
10942 and Japanese Utility Model Application No. 56-115612) have been proposed.

However, while the former method has an excellent ability to separate oil from the exhaust, it is inevitably large-scale, requiring a washing water system, and the air resistance of the exhaust passage is large, so a powerful exhaust fan is required. There was a drawback to that. In addition, in the latter case, the area of the blades and rods that play the main role in collision separation is small, and because they are simply rotated in one direction, oil particles that have passed through the gaps between the blades and rods are captured. Therefore, the ability to capture and separate oil is insufficient, and it is not possible to prevent oil from adhering to the inner surface of the exhaust duct or the exhaust fan, necessitating periodic maintenance and inspection of the exhaust duct from the standpoint of disaster prevention.

In addition, the ink mist generated when printing letterpress is melted for recycling pollutes the atmosphere if discharged directly to the outside. Conventionally, the exhaust gas containing this ink mist is passed through a copper air filter, a grease filter, and an activated carbon filter in sequence. However, most of the ink mist still passes through the filter, and the ink mist in the exhaust gas cannot be reliably collected.

The present invention has been devised to solve the above-mentioned conventional problems, and includes one or more pairs of two types of impellers in which the inclination directions of the blades are opposite to the direction of the rotation axis are alternately arranged in the exhaust direction in the exhaust duct. At least one baffle plate is provided on the downstream side of the impeller and has an opening in the center and extends from the inner surface of the duct, so that the blades of the impeller can freely rotate. This method collects the oil, etc. attached and splashes it to the inner surface of the duct, and also causes the flow of the exhaust to collide with the baffle plate. It is characterized in that it is ensured that it is collected by the plate and the inner surface of the duct on the upstream side thereof.

The present invention will be described below with reference to FIGS. 1 and 2 showing an example of an oil separation device.
To explain with reference to the drawings, reference numeral 1 in the drawing is a canopy of a kitchen exhaust hood, and a grease filter 2 is installed inside the canopy 1 via a hanging frame 3.

Reference numeral 4 denotes an oil receiver that collects oil collided and collected within the grease filter 2 and flows down, and is supported at the lower part of the hanging frame 3. Reference numeral 5 denotes an exhaust duct, which is connected to the upper opening of the canopy l, rises continuously with the opening, bends (3) degrees and extends laterally, and is connected to a window hole 7 provided in the building frame 6. There is.

Reference numeral 8 denotes an exhaust fan, which is installed inside the window hole 7 of the building frame 6. Reference numeral 9 denotes a mounting duct which is fitted into the entrance of the exhaust duct 5 through the upper opening of the canopy l and fixed together with the hanging frame 3 to the periphery of the upper opening of the canopy 1. A shaft 10 passing through the center is supported, and on the shaft 10, as shown in FIG. In the case of the embodiment, they are attached in pairs (one pair, two in total) at appropriate intervals. Furthermore,
On the downstream side of each impeller 11, 12, a baffle plate 14 is provided which gradually narrows from the inner surface of the duct in the exhaust direction and has an opening 13 formed in the projecting center. At the lower end of each baffle plate 14, oil drain ports 16 are provided, which are notched here and there and allow vertical communication between the inner surface of the mounting duct 9. Further, an oil receiver 17 is continuously provided on the inner periphery of the lower end of the mounting duct 9, and the oil receiver 17 is a groove-shaped or tubular drain provided on the side plate of the hanging frame 3 to which the grease filter 2 is not attached. It communicates with the oil pan 4 via an oil passage (not shown).

In the above configuration, when the exhaust gas containing oil mist is suctioned by the exhaust fan 8 and passes through the grease filter 2 and this device in sequence, the large mass of oil particles in the exhaust gas are first collected by the grease filter 2 and then the oil pan 4. The large-mass oil particles and small-mass oil particles that were not collected by the grease filter 2 are then reliably collected by the functions of this device, which will be described in detail below, and are sent to the oil pan via the oil pan 16. The exhaust gas from which the oil has been separated and removed passes through the exhaust duct 5 and is discharged to the outside.

The functions of this device are as follows.

The flow of exhaust gas that passes through the grease filter 2 and rises first hits the blades of the impeller 11 in the first stage and turns the impeller 11, at which time it is rotated somewhat in the opposite direction to the rotation direction of the impeller 11. , and is narrowed down by the first stage baffle plate 14 and passes through the central opening 13 thereof. The flow of exhaust gas that has passed through the opening 13 of the baffle plate 14 in the first stage spreads rapidly and uses the blades of the impeller 12 in the second stage to turn the impeller 12 in the opposite direction to the impeller 11. At this time, it is rotated somewhat in the opposite direction to the rotational direction of the impeller 12, and is narrowed by the second-stage baffle plate 14 and passes through the central opening 13 thereof.

Therefore, the oil in the exhaust gas that has passed through the grease filter 2 is first collected by the blades of the impeller 11 in the first stage, and then is splashed toward the inner surface of the duct by centrifugal force and is deposited on the inner surface of the mounting duct 9. At the same time as it adheres, it is collided and collected by the first stage baffle plate 14, and both are transferred to the oil pan 17 through the installation duct 9.
It flows down the inside of the body.

The oil in the exhaust that has not been collected is adhering to and collected by the blades of the second stage impeller 12, and is then blown off to the inner surface of the duct by centrifugal force and adheres to the inner surface of the mounting duct 9. It is collided and collected by the second stage baffle plate 14,
In both cases, the installation duct 9 passes through the oil drain port 16 and connects to the oil receiver 17.
It flows down the inside of the body. The oil accumulated in the oil pan 17 is collected into the oil pan 4 via an oil drain path (not shown).

In this way, the above embodiment has two impellers 11
, 12 are configured to rotate in different directions, so the second
The oil particles in the exhaust gas collide with the stage impeller at an angle close to perpendicular to improve the collection effect of oil adhering to the impeller and colliding with the impeller.
The action of 2 and the collision collection action of the baffle plate 14 work together to dramatically improve the effect of separating and collecting oil in the exhaust gas. Furthermore, as will be described in detail later, by slightly modifying the structure of the baffle plates, etc., this device can be placed in either the vertical or horizontal position without any problem.

Note that if the impeller is not forcibly driven to rotate by a motor, etc., the exhaust capacity will be reduced by the impeller and baffle plate, so there will naturally be restrictions on the number of stages to install the impeller, but as shown in the figure, the impeller and baffle plate will reduce the exhaust capacity. Even if two baffle plates (two stages) are provided, no problem will occur. However, for example, if the first stage impeller 11 located on the most upstream side is actively rotated by the motor 18 as in the second embodiment shown in FIG. 4, the exhaust capacity can be improved. In this case, it is also possible to use three or more baffle plates 14 in combination with the impellers 11 and 12, since it is possible to improve the function of the device.

Further, the present device may not be provided at the rising portion of the exhaust duct 5, but may be provided at the horizontal portion of the duct as in the embodiments shown in FIGS. 5 and 6.

This third embodiment differs from the first embodiment shown in FIGS.
The mounting duct 19 corresponding to the baffle plate 14 can be inserted from the side and connected from the flange joint side, and the baffle plate 21 corresponding to the baffle plate 14 is extended straight inward from the inner surface of the duct, and the opening n The first point is that the peripheral edge protrudes toward the upstream side, and the other is that an oil pan is provided at the bottom of the mounting duct 19, but the first point is that it can be easily removed for cleaning etc. as in the first embodiment. This is for the purpose of the second. The third point is to securely discharge the oil separated from the exhaust gas to the outside as in the first embodiment, and the function of separating the oil from the exhaust gas is similar to that of the third embodiment.

The fourth embodiment shown in FIG. 7, which differs from the third embodiment in that the impeller 11 is rotated by a motor 18, corresponds to the second embodiment shown in FIG. It is second in that it can enhance the oil separation function.
The embodiments have the same effect.

Of course, various applications can be made without changing the gist of this invention. .

For example, in the above embodiment, the oil mist in the kitchen exhaust passage was separated from the exhaust gas, but for example, ink mist generated in the printing letterpress recycling process, or cutting oil in the metal cutting and polishing process that is incompletely burned. Oil mist generated by
It can also be applied to separate paint mist from paint factories from exhaust gas.

As described above, according to the present invention, the impeller for collecting adhesion and the baffle plate for collecting collisions are organically arranged in the exhaust duct so as to obtain the best collection efficiency. etc. can be reliably collected and separated.

[Brief explanation of drawings]

FIGS. 1 and 2 are a schematic diagram showing the configuration of a device according to a first embodiment of the present invention, and a front view enlarging the main parts of the same figure, and FIG. 3 shows how the blades of the impeller are attached to the boss. FIG. 4 is a front view showing the device configuration of a second embodiment of the present invention, and FIGS. 5 and 6 are a schematic diagram and a schematic diagram showing the device configuration of a third embodiment of the present invention, respectively. FIG. 7 is a front view showing the configuration of a device according to a fourth embodiment of the present invention. 5...Exhaust duct, 8...Exhaust fan, 9.19...Mounting duct, 10...
...Shaft, 11, 12... Impeller, 13,
22...Opening, 14, 21...Baffle plate, 15, 17, 23...Oil pan, 16.
...Oil drain port, 18...Motor, addition.
...Flange joint. Figure 1 Figure 2 75 Figure 3 Figure 4 Figure 5! pH Figure 6 Figure 7

Claims (1)

[Claims] In the exhaust duct, one or more pairs of 2 m impellers having blades with the inclination direction opposite to the rotational axis direction are rotatably arranged at alternating intervals in the exhaust direction, and on the downstream side of the impellers. A device for separating oil, etc. from exhaust gas, characterized in that at least one baffle plate is provided that extends from the inner surface of a duct and has an opening formed in the center.