JP2002058941A - Oil mist capturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil mist capturing apparatus capable of capturing oil mist on a downstream side after separating high-temperature solid on an upstream side, preventing the separated mist from ignition, and extinguishing fire with a simple constitution even when a filter is ignited. SOLUTION: This oil mist capturing apparatus is provided with a blowing route 1, a blower 2, a filter 3 for capturing oil mist, a high-temperature solid separator 5 provided on the upwind side of the filter 3 of the route 1 for separating high-temperature solid such as high-temperature chips, dust, etc., and a fire extinguishing nozzle 4 for clogging the filter 3 by discharging fire extinguisher at a place on the upwind side of the filter 3 and on the downwind side of the device 5. The device 5 consists of a separation part 14a existing in the main flow area of exhaust for separating the high-temperature chip and the high-temperature dust in the exhaust and an accumulating part 14b existing at a position away from the main flow area of the exhaust for depositing the separated chip and dust.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil that captures oil mist from exhaust gas containing oil mist by passing the exhaust gas containing oil mist generated from a machine tool performing metal working through a filter. It relates to a mist capturing device.

[0002]

2. Description of the Related Art Conventionally, oil mist generated from a machine tool that performs metal working deteriorates the environment in a factory.
Exhaust gas containing oil mist is introduced into the ventilation path containing the filter for trapping oil mist, and the oil mist is trapped by the filter for trapping oil mist provided in the middle of the ventilation path to prevent the environment from deteriorating. .

[0003] Oil mist in the exhaust gas adheres or accumulates inside the filter or the air passage.

[0004] In recent years, so-called dry cutting that does not use an oil agent at the time of cutting has begun to be employed, but in this dry cutting, extremely high-temperature chips are discharged. When the high-temperature chips and high-temperature dust come into contact with the oil mist capturing filter, the oil mist captured by the filter may ignite and cause a fire.

[0005] Further, as a result of pursuing higher efficiency than dry cutting, ultra-high-speed cutting has begun to be adopted. In this case, the chips become hotter than dry cutting, and the risk of fire is further increased. .

Therefore, in dry cutting or ultra high speed cutting, it is indispensable to take a fire prevention measure for the oil mist catching device.

[0007] Therefore, high-temperature chips and high-temperature dust in the exhaust gas are separated on the upstream side of the oil mist trapping filter in the ventilation path, so that high-temperature swarf and high temperature dust are located on the downstream oil mist trapping filter side. It is conceivable to prevent dust from flowing in. Japanese Patent Application Laid-Open No. H11-285610 is provided as a conventional example in which such measures are taken.

In this conventional example, a fire type removing section, a fire prevention damper, a fire extinguishing nozzle for discharging a fire extinguishing agent, and a filter are provided in order from the upstream side to the downstream side in the ventilation passage. However, in this conventional example, the fire type removing unit is configured by incorporating a unit having a baffle plate such as an armor plate or a plate-like body having a small hole so as to shut off the ventilation path in the ventilation path. When the exhaust collides with the plate with the armor plate or small holes and passes through the armor plate or small holes, it separates the hot chips and hot dust, and the separated chips and dust collect in the unit It has become. In other words, in the above-described conventional example, the high-temperature chips and high-temperature dust are separated from the exhaust gas by the fire removal unit so that the high-temperature chips and high-temperature dust do not flow into the downstream filter. ,
The hot swarf and high-temperature dust do not come into contact with the oil mist trapping filter to ignite the oil mist trapped in the filter. Powder and dust accumulate.

In the conventional example, a unit having a baffle plate, such as an armor plate or a plate-like body having a small hole formed therein, as described above, is incorporated in the ventilation path so as to cut off the ventilation path. Due to the structure, chips and dust deposits containing the separated oil mist accumulate where the main flow of the exhaust in the ventilation path comes into contact. However, since the separated chips and dust contain oil mist, if the high-temperature chips or high-temperature dust in the exhaust gas comes into direct contact with the chips and dust deposits containing this oil mist,
The oil mist adhering to the swarf and dust deposits may easily ignite and cause a fire from the deposits in the fire removal unit.

As described above, in the above-described conventional example, a fire type removing unit is provided to separate high-temperature chips and dust in the exhaust gas so that the high-temperature chips do not flow to the downstream filter. Nevertheless, chips and dust containing oil mist accumulate in the main stream of exhaust in the ventilation path, and the high-temperature chips and dust contained in the main stream of exhaust directly contained oil mist. There is a danger of fire due to ignition upon contact with the sediment.If a fire occurs due to the separated chips and dust deposits at the igniter, the downstream oil mist trapping filter will ignite and become larger. There is a problem that a fire occurs.

For this reason, in the above-mentioned conventional example, it is necessary to provide a fire damper downstream of the fire removal unit so as to mechanically cut off the flow of exhaust gas so that the fire generated in the fire removal unit does not fly downstream. . However, the provision of such a fire damper complicates the structure and causes a problem of increased cost.In addition, in an oil mist or dusty atmosphere, the fire damper has an oil mist or Dust and chips may be clogged and hardened, and the fire damper may not function in the event of a fire without closing. There is a problem that it is easy to ignite and a fire easily occurs.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and reliably separates high-temperature solids such as high-temperature chips and high-temperature dust in exhaust gas with a simple configuration on the upstream side. In addition, oil mist in the exhaust gas can be reliably captured on the downstream side with a simple configuration, and the sediment such as chips and dust separated on the upstream side does not accumulate in the main area of the exhaust gas. A simple configuration can be achieved even if high-temperature chips or high-temperature dust passes through the high-temperature solids separation device and ignites the oil mist adhering to the downstream filter in the event that a fire occurs due to ignition of the oil. It is an object of the present invention to provide an oil mist catching device capable of reliably extinguishing a fire and preventing a fire of the oil mist catching device.

[0013]

In order to solve the above-mentioned problems, an oil mist catching device according to the present invention comprises: a ventilation path 1 into which exhaust gas containing oil mist is introduced;
A blower 2 provided inside the air blower 1 for introducing exhaust gas into the blower passage 1, a filter 3 provided in the blower passage 1 for catching oil mist, and a wind of the filter 3 for catching oil mist in the blower passage 1. A high-temperature solid separator 5 for separating high-temperature solids, such as high-temperature chips and dust, contained in the exhaust containing oil mist from the exhaust provided on the upper side; A fire extinguishing nozzle 4 for discharging the fire extinguishing agent on the leeward side and clogging the filter 3 with the discharged fire extinguishing agent. And a separating section 14a for separating high-temperature dust,
And a reservoir 14b for accumulating separated chips and dust at a position distant from the main exhaust gas basin.

With such a structure, the exhaust containing oil mist is introduced into the blowing path 1 by the blower 2, and the high-temperature solid separation device 5 provided on the upstream side of the blowing path 1 cuts off the high temperature from the exhaust. Separates powder and high-temperature dust, and blows air 1
The oil mist contained in the exhaust gas can be captured not only by the oil mist capturing filter 3 provided on the downstream side of the high temperature solid separation device 5 but also in the high temperature solid separation device 5. Separation section 14a
The high-temperature chips and dust contained in the exhaust gas are separated from each other, and the separated chips and dust are deposited in a reservoir 14b located at a position away from the main flow area of the exhaust gas. Does not come into contact with the chips and dust deposits deposited in the lower reservoir 14b, and therefore the high-temperature chips and dust contained in the main stream of the exhaust gas are directly separated by the high-temperature solid separation device 5. There is no danger of igniting the deposited chips and dust deposits to cause a fire, and the fire flame of the chips and dust deposits separated by the high-temperature solid separator 5 is used to catch oil mist provided on the downstream side. Oil mist adhering to the filter 3 does not ignite,
As a result, it is not necessary to provide a fire damper for preventing the flame when the deposit is ignited as in the related art from igniting on the downstream filter 3 for catching oil mist.

In the unlikely event that high-temperature chips or high-temperature dust passes through the high-temperature solid separation device 5 and goes deep in the high-temperature state, it adheres to the oil mist trapping filter 3 provided in the ventilation path 1. Even if oil mist or oil is ignited, a fire extinguishing agent is discharged from a fire extinguishing nozzle 4 arranged on the windward side of the oil mist trapping filter 3 to extinguish the fire, and the oil mist trapping filter 3 is extinguished by the fire extinguishing agent. By clogging, the inside of the ventilation path 1 is made a closed space so that oxygen is not supplied, so that fire can be surely extinguished in the oil mist trapping device and fire spread can be prevented.

Further, a separation box 10 having a rectangular cross section is used.
The high-temperature solid separation device 5 is used as a separating part 14a for separating high-temperature chips and dust from the exhaust gas, and as a storage part 14b for storing the separated chips and dust from the lower part of the separation box 10. The separation section 14a is configured such that an exhaust pipe 11 that communicates the inside of the separation box 10 with the downstream filter 3 is inserted into the separation box 10, and an exhaust inlet 12 is provided on the side wall 10a of the separation box 10 and the exhaust inlet 12 is connected to the separation section 14a. Exhaust flowing from the exhaust inlet 12 between the periphery of the exhaust tube 11 and the upper side wall 10a of the separation box 10 having a rectangular cross section is positioned above the lower end opening 11a of the exhaust tube 11, and the lower end opening of the exhaust tube 11 The exhaust gas flowing from the exhaust inlet 12 is disposed around the exhaust pipe 11 and above the separation box 10 because the separation flow path 13 for flowing to the separation box 13 is formed. Separation channel between the side walls 10a of 1
In the process of flowing into the lower end opening 11a of the exhaust pipe 11 and colliding with the upper inner surface of the side wall 10a of the separation box 10 having a rectangular cross section, the hot chips and hot dust are separated from the exhaust gas. While being cooled, it falls down and accumulates in the lower reservoir 14b in the separation box 10, but the main flow of the exhaust gas is from the exhaust inlet 12 to the periphery of the exhaust pipe 11 and the upper side wall 10a of the separation box 10. Flows through a path from the separation channel 13 to the lower end opening 11a of the exhaust pipe 11, and the storage part 14 at the lower part of the separation box 10.
Since b is out of the main flow area of the exhaust gas, the main flow of the exhaust gas does not directly come into contact with the swarf or dust deposits deposited in the lower reservoir 14b of the separation box 10, and therefore, the main flow of the exhaust gas The contained high-temperature chips and high-temperature dust are sequentially deposited in the reservoir 14b of the high-temperature solid separation device 5,
There is no supply of fresh oxygen due to the air flow phenomena that cause ignition, because there is no supply of fresh oxygen.
There is no danger of igniting the swarf or dust deposits separated in the reservoir 14b and accumulating in the reservoir 14b to cause a fire, and the fire caused by the swarf or dust deposits separated in the high-temperature solid separation device 5 Of the oil mist adhering to the oil mist trapping filter 3 provided on the downstream side does not ignite, and as a result, with a simple configuration, the high temperature of the exhaust A high-temperature solid separation device 5 comprising a separation unit 14a for separating chips and high-temperature dust, and a storage unit 14b for depositing the separated chips and dust at a position away from the main stream of exhaust gas. Can be formed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings.

An oil mist catching device 6 for catching oil mist generated from a machine tool for performing metal working is as shown in FIG.
A high-temperature solids separation device 5 for separating high-temperature solids such as high-temperature chips and dust contained in the exhaust gas from the exhaust gas; a filter 3 for catching oil mist; And a fire extinguishing nozzle 4 for clogging. In the embodiment shown in the accompanying drawings, an oil mist trapping device 6 is connected to an upstream side of a main body device 6a having a blower 2, an oil mist trapping filter 3, and a fire extinguishing nozzle 4. Is configured.

The high-temperature solid separation device 5 includes a separation portion 14a for separating high-temperature chips and high-temperature dust in the exhaust gas in the main flow area of the exhaust gas, and a separation section 14a in a position remote from the main flow area of the exhaust gas. Reservoir 14 for accumulating collected chips and dust
b.

In the embodiment shown in the figure, a separation box 10 having a rectangular cross section and constituting the outer shell of a high-temperature solid separation device 5 is shown.
The upper part of the inside is a separation part 14a through which the main flow of the exhaust flows, and the lower part inside the separation box 10 is a reservoir part 14b separated from the main flow area of the exhaust.

The separating section 14 formed in the upper part of the high-temperature solid separating apparatus 5 has the following configuration. That is, the exhaust pipe 11 is inserted into the upper portion of the separation box 10 having a rectangular cross section, and the lower end of the exhaust pipe 11 is located at a substantially middle portion in the vertical direction of the separation box 10 or at a position higher than the substantially middle portion. ing. Side wall 10a of separation box 10
The exhaust inlet 12 is provided in the exhaust pipe 1
1 is located above the lower end opening 11a. In the embodiment shown in the accompanying drawings, the exhaust pipe 11 is inserted into the separation box 10 from the center of the upper surface of the separation box 10, and the lower end opening 11a of the exhaust pipe 11 is
0, but if at least the lower end opening 11a of the exhaust tube 11 is located above the substantially intermediate portion or approximately the intermediate portion of the separation box 10 in the vertical direction, the exhaust tube 11 To the side wall 10a of the separation box 10.
May be inserted into the separation box 10. As shown in FIG. 3A, the exhaust inlet 12 is shifted to the side end of the side wall 10a of the separation box 10 in a plan view, and the exhaust flow from the exhaust inlet 12 is positioned on the side wall 10a facing the exhaust box. 3 (a), the exhaust flow colliding as shown by the arrow a in FIG. 3 (a), and the exhaust flow which collided because the exhaust inlet 12 is shifted to the side end side of the side wall 10a.
While flowing in one direction through the separation channel 13 around the exhaust pipe 11 as indicated by an arrow b, the air flows as indicated by an arrow c in FIG. 3B. The main flow of the exhaust gas flowing from the exhaust inlet 12 flows between the periphery of the exhaust pipe 11 formed in the high-temperature solid separation device 5 and the upper side wall 10 a of the separation box 10 to the lower end opening 11 a of the exhaust pipe 11. Of the separation channel 13.
Is a flow path 1a that constitutes a main flow area of exhaust gas on the upstream side of the blowing path 1. The flow path 1a, which is the main flow area of the exhaust gas configured as described above, is located at the upper separation section 1 in the high-temperature solid separation apparatus 5.
4a.

In the present invention, the separation box 10 has a rectangular cross section for the following reason. That is, the exhaust gas flowing into the separation box 10 from the exhaust port 12 collides with the upper inner surface of the side wall 10a of the separation box 10 facing the exhaust port 12 and changes its direction to flow.
As shown in FIG. 3, the collision flow sequentially flows through the separation flow path 13 and into the lower end opening 11a of the exhaust pipe 11 while colliding with the upper inner surface of each side wall 10a of the separation box 10 having a rectangular cross section. By flowing while successively colliding with the upper inner surface of each side wall 10a of the separation box 10 having the rectangular cross-section as described above, high-temperature chips and high-temperature dust are separated from the exhaust gas, cooled and cooled, as shown in FIG. As shown in b), it falls down and is deposited in the lower reservoir 14b in the separation box 10. However, the separation box 10
Has a circular cross section, the exhaust flow is
Flows along the inner wall of the circular cross section of the cylinder, and high-temperature chips and high-temperature dust adhering to the oil contained in the exhaust keep rotating around the inner wall of the cylinder for a long time due to centrifugal force and swirling flow. This is undesirable because it ignites itself upon receiving a supply of air.

As described above, the separation box 10 has a rectangular cross section as a component of the upper separation section 14a in the high temperature solid separation apparatus 5.

Although the exhaust tube 11 is shown as a cylinder in the attached drawings, it may be a square tube.

The main unit 6a has a flow path 1b that forms the downstream side of the air flow path 1 for introducing exhaust containing oil mist into a case 7 that forms an outer shell. One end of the flow path 1b formed in the case 7 is a suction port 8 opened on the outer surface of the case 7, and the other end is a blowout port 9 opened on the outer surface of the case 7. A blower 2, a fire-extinguishing nozzle 4 for discharging a fire-extinguishing agent, and an oil mist in the exhaust gas are sequentially taken from a suction port 8 side which is an inlet of the flow path 1 b formed in the case 7 to an outlet 9 side which is an outlet. The filter 3 for catching the oil mist is disposed.

The suction port 8 provided in the case 7 is connected to the exhaust pipe 11 of the high-temperature solid separation device 5. In the embodiment shown in the accompanying drawings, the exhaust stack 11 is
However, the exhaust pipe 11 and the suction port 8 may be connected to each other by a separate duct.

The blower 2 comprises a motor 2a and a fan 2b. A fire extinguisher arrangement chamber 15a is formed in the case 7 and is separated from the ventilation path 1. The fire extinguisher 15 is housed in the fire extinguisher arrangement chamber 15a. Fire extinguisher 15
The fire extinguishing nozzle 4 is connected to the fire extinguishing nozzle 4 by a pipe 16, and the fire extinguishing nozzle 4 is disposed between the blower 2 in the air blowing path 1 and the filter 3 for catching oil mist.

A sensor 26 such as a temperature sensor is provided in the air blowing path 1. When the temperature in the air blowing path 1 exceeds a certain temperature, the sensor 26 detects the temperature and the fire is extinguished from the fire extinguishing nozzle 4 connected to the fire extinguishing nozzle 4. The agent is discharged into the blowing path 1. As the fire extinguisher 15, there are a type that discharges a foam or liquid fire extinguisher and a type that discharges a powder fire extinguisher, and in this embodiment, any type may be used. It is.

FIG. 4 shows a schematic configuration of the fire extinguisher. A sensor signal of a sensor 26 such as a temperature sensor is sent to a control unit 27 and compared with a preset temperature. When the temperature exceeds a preset temperature, the control unit sends a fire extinguisher emission signal to the fire extinguisher starting device 28 provided in the fire extinguisher 15 so that the fire extinguisher is emitted. The container of the fire extinguisher 15 is pressurized in advance to a pressure required for extinguishing the extinguisher, and the extinguisher is emitted by the applied pressure when the extinguisher starting device 28 is operated. The sensor signal control unit 27 may include a normal power supply 29a and a backup power supply 29b so that the backup power supply 29b is turned on at the time of a power failure.

The filter 3 for catching oil mist is obtained by sewing a fiber mat such as glass fiber or non-woven filter material into a bag shape and attaching a plurality of them to a frame serving as an air inlet, or a filter paper as shown in FIG. The filter medium 16 made of
0, and a corrugated separator 17 is inserted between the filter media 16, but is not limited to this, and may be of any other form as long as it can catch oil mist.

In the figure, 25 is a stand for installing the oil mist catching device of the present invention, but the stand 25 may not be provided in some cases.

However, when metal working is performed by a machine tool, oil mist is generated when cutting oil is used, and oil adhering to metal becomes metal mist even in metal processing without using cutting oil. Although generated, by operating the blower 2, exhaust containing oil mist generated when performing metal working with the machine tool is introduced into the air blast path 1 of the oil mist capturing device 6. In this case, high-temperature chips and high-temperature dust generated at the time of metal processing by the machine tool are introduced into the air blowing path 1 together with the exhaust including oil mist.

When the exhaust gas introduced into the blowing path 1 contains high-temperature chips and high-temperature dust therein, the exhaust box 12 of the high-temperature solid separation device 5 passes through the separation box 10 having a rectangular cross section. High-temperature chips and high-temperature dust in the exhaust gas are separated at the upper separating section 14 in the high-temperature solids separator 5 which is the main flow area of the exhaust gas in the high-temperature solids separator 5. That is, the exhaust gas flowing from the exhaust inlet 12 into the upper part of the separation box 10 collides with the upper inner surface of the side wall 10a of the separation box 10 facing the exhaust inlet 12 and changes its direction to flow. In the process of flowing through the separation flow path 13 between the periphery of the exhaust pipe 11 and the upper side wall 10a of the separation box 10 and flowing into the lower end opening 11a of the exhaust pipe 11, As shown in FIG. 3, the water flows while colliding with the upper inner surface of each side wall 10 a of the box 10 one after another, whereby hot chips and hot dust are separated from the exhaust gas and cooled.
As shown by the arrow d in FIG.
It will be deposited in the lower reservoir 14b in the area 0.

At this time, the main flow of the exhaust gas flowing through the separation box 10 is: the exhaust inlet 12 → the separation channel 13 between the periphery of the exhaust pipe 11 and the upper side wall 10 a of the separation box 10 → the lower end opening of the exhaust pipe 11. 11a (that is, the flow along the arrows a, b, and c in FIGS. 3 (a) and 3 (b)), and the reservoir 14b at the lower part of the separation box 10 is the main flow area of the exhaust gas (FIG. 3 (a)). (B) deviates from the path of the arrows a, b, and c), so that the main flow of the exhaust gas directly contacts the deposits e of the chips and dust accumulated in the reservoir 14b at the lower part of the separation box 10. It does not. For this reason,
High-temperature chips and high-temperature dust contained in the main stream of exhaust gas do not directly contact the sediment e. Even if they do, there is no supply of fresh air, so there is no danger of ignition. It is.

As described above, the high-temperature solids such as high-temperature chips and high-temperature dust contained in the exhaust gas are separated by the high-temperature solid separation device 5 and cooled, and the high-temperature solids are separated from the reservoir 14b outside the main flow area of the exhaust gas. Since the sediment is deposited, there is no danger of igniting the sediment e of the separated swarf or dust and causing a fire. Therefore, it is possible to prevent the high temperature solid separation device 5 from spilling over to the filter 3 for catching the oil mist. No fire damper is needed.

As described above, the high-temperature solid chips and dust are separated from the exhaust gas by the high-temperature solid separation device 5 and accumulate in the reservoir portion 14b deviating from the main flow area of the exhaust gas. Exhausted exhaust gas will flow.

Exhaust gas containing oil mist from which high-temperature solids such as chips and dust have been separated through the high-temperature solid separation device 5 flows from the lower end opening 11a of the exhaust pipe 11 through the exhaust pipe 11 through the suction port 8 to the flow path. 1b, the oil mist is captured by the filter 3 for capturing the oil mist, and is discharged from the outlet 9 as clean exhaust.

Accordingly, the oil mist adheres to the oil mist trapping filter 3.
Oil mist adheres to the inner wall and the like of the blowing path 1 and the fan 2b.

Here, if chips and dusts, which are high-temperature solids, pass through without being separated by the high-temperature solids separation device 5 and flow into the blowing path 1 downstream of the high-temperature solids separation device 5, high-temperature cutting There is a possibility that the oil mist or the oil may ignite when the powder or the high-temperature dust comes into contact with the oil mist or the oil attached to the filter 3 for capturing the oil mist or the air passage 1. However, in the present invention, when oil mist or oil is ignited and a flame is generated, the sensor 26 detects the flame and discharges the fire extinguishing agent from the fire extinguishing nozzle 4 disposed on the windward side of the oil mist capturing filter 3. To extinguish the fire and clog the filter 3 for catching the oil mist with a fire extinguishing agent. As described above, when the filter 3 for catching oil mist is clogged with the fire extinguishing agent, the inside of the ventilation path 1 becomes a closed space and oxygen is not supplied, and the fire is surely extinguished in the oil mist catching device 6 and fire spread. That can be prevented.

When the fire extinguishing agent discharged from the fire extinguishing nozzle 4 is a powder fire extinguishing agent, it is preferable to use a powder extinguishing agent having a particle size larger than the fine ventilation gap of the filter 3 for catching oil mist, but not necessarily. It is not necessary to use a filter in which the particle size of the powder fire extinguisher is larger than the fine ventilation gap of the filter 3 for catching oil mist. That is, if the filter 3 for catching oil mist is a mesh filter, the flow velocity that can be classified is determined from the mesh wire diameter according to Stokes' law. When the fire extinguishing agent collides with the oil mist trapping filter 3 at this flow rate, the powdered fire extinguishing agent is successively trapped on the upstream surface of the oil mist trapping filter 3, aggregates and expands, and the oil mist trapping filter is formed. No. 3 can be clogged.

When the fire extinguishing agent discharged from the fire extinguishing nozzle 4 is a foam fire extinguishing agent or a liquid fire extinguishing agent, when the foam extinguishing agent or the liquid fire extinguishing agent is radiated from the fire extinguishing nozzle 4, the fire extinguishing agent is exhausted by the blower 2. The flow forcibly adheres to the upstream surface of the oil mist trapping filter 3 located downstream. In this case, a fire extinguishing nozzle 4 is selected in which the particle size of the fire extinguishing agent discharged from the fire extinguishing nozzle 4 is larger than the minimum diameter of the filter 3 for catching oil mist. Although the exhaust flow of the blower 2 flows through the filter 3 for catching oil mist, the ventilation resistance of the surface on the upstream side of the filter 3 for catching oil mist is not always uniform, and the surface of the exhaust flow has a small ventilation resistance. There is the property of flowing. As a result, the fire extinguishing agent that is forcibly attached to the surface of the filter 3 for catching oil mist by the pressure of the exhaust stream of the blower 2 adheres to the surface of the filter 3 for catching oil mist from the surface with a small ventilation resistance, and the surface is removed. Then, the filter 3 is clogged, and then the surface of the filter 3 for catching oil mist having high ventilation resistance is clogged. The order of the clogging is shown in FIGS.
5 and 6, the arrow A indicates the flow direction of the exhaust flow, and the arrow B indicates the direction in which the clogged portion is formed by the fire extinguishing agent in the surface direction of the filter 3 for catching the oil mist. Reference numeral 19 indicates a fire extinguisher. Also,
The foam for extinguishing the foam on the upstream side of the filter 3 for catching the oil mist is pushed into the filter 3 for catching the oil mist by the pressing of the blower 2 (that is, the wind pressure by the blower 2), and the clogging state is reduced. Be strong. Foam fire extinguishing agent that has clogged the filter 3 for catching oil mist may reduce foam to liquid at the contact surface with the filter 3 for catching oil mist. A water film is formed by the surface tension between the bubbles, and the surface tension between the filter 3 for capturing the oil mist and the bubbles increases to make the clogged state more firm. Even after the filter 3 for catching the oil mist is clogged, the pressure from the blower 2 is applied to the surface of the filter 3 for catching the oil mist, and the fire extinguishing agent that has clogged the filter 3 for catching the oil mist also has foam or It is possible to maintain the clogged state without dripping irrespective of the arrangement direction of the filter 3 for catching oil mist.

Therefore, the filter 3 for catching the oil mist can be uniformly and firmly clogged with the fire extinguishing agent radiated from the fire extinguishing nozzle 4 when pressed by the blower 2, and at the same time, can be maintained for a long time. The effect of suffocation can be enhanced.

The same applies to the liquid fire extinguishing agent.
A water film is formed on the surface on the upstream side of the oil mist trapping filter 3 by the fire extinguishing agent injected from the oil mist, and the same effect as described above can be obtained.

Here, if the material of the filter 3 for trapping oil mist is made to have water absorption and water retention, the holding effect of the fire extinguishing agent is further improved, and the filter 3 for trapping oil mist is improved.
Has a higher clogging effect.

Incidentally, when a medium-performance and high-performance oil mist trapping filter 3 is used as the oil mist trapping filter 3, the fire extinguishing agent 4 is discharged from the fire extinguishing nozzle 4 and the oil mist trapping filter 3 takes a few seconds. And reaches a final pressure loss (200 Ps to 250 Ps), and is in a clogged state, and the clogging is maintained even after 30 minutes have passed.

[0046]

As described above, according to the first aspect of the present invention, the air flow path through which the exhaust gas including the oil mist is introduced is provided, and the exhaust gas is provided in the air flow path so that the exhaust gas flows through the air flow path. High temperature contained in the exhaust containing the oil mist provided on the windward side of the oil mist trapping filter provided in the blower path and the oil mist trapping filter provided in the blower path. A high-temperature solids separator that separates high-temperature solids such as chips and dust from exhaust gas;
A fire extinguishing nozzle for discharging the fire extinguishing agent on the leeward side of the filter and on the leeward side of the high-temperature solid separation device and clogging the filter with the discharged extinguishing agent is provided. High-temperature solids separation device on the upstream side of the ventilation path to separate hot chips and high-temperature dust generated during metalworking, and a downstream filter for capturing oil mist. In addition to being able to purify the exhaust by capturing the oil mist contained in the exhaust, a high-temperature solids separator is located in the main stream of the exhaust to separate hot chips and hot dust in the exhaust. And a reservoir for accumulating separated chips and dust at a position away from the main exhaust flow area. Directly contacts the chips and dust deposits containing oil mist deposited in the reservoir at the bottom of the separation box, and the high-temperature chips and high-temperature dust contained in the mainstream of the exhaust directly remove the oil mist. The sediment containing oil mist separated and deposited by the high-temperature solid separation device may cause a fire due to the danger of fire upon contact with the deposited sediment and igniting. ,
The flame does not ignite on the downstream side of the filter for catching oil mist, and as a result, the flame when igniting the sediment as in the related art scatters on the downstream filter for catching oil mist. This eliminates the need for a fire damper to prevent spills, simplifies the structure and reduces costs. In addition, high-temperature chips and dust pass through the high-temperature solids separation device and trap oil mist. Even if the oil mist or oil ignites in contact with the oil mist or oil attached to the filter for fire, the fire extinguishing agent is discharged from the fire extinguishing nozzle arranged on the windward side of the filter for catching the oil mist, and the fire is extinguished. The filter for catching oil mist is clogged with fire extinguishing agent, and the inside of the ventilation path is closed so that oxygen is not supplied to the oil mist catching device. There can be prevented and flame spread perform reliably extinguish, simple and cost extinguishing structures are those that can be reduced.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, the upper portion of the separation box having a rectangular cross section is used to separate hot chips and dust from exhaust air. A high-temperature solid separation device is configured as a separation unit for the separation and a lower part of the separation box as a storage unit for storing separated chips and dust, and the separation unit is installed in the separation box and a filter in the downstream of the separation box. And an exhaust port is provided at the side wall of the separation box, the exhaust port is positioned above the lower end opening of the exhaust cylinder, and the upper side wall of the separation box has a rectangular cross section with the periphery of the exhaust cylinder. Between the exhaust gas inlet and the exhaust gas flow through the lower end opening of the exhaust pipe as a separation flow path. Chips and A high-temperature solids separator consisting of a separator for separating warm dust and a reservoir for depositing separated chips and dust away from the main exhaust area can be constructed. Is simplified, and the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 shows an oil mist catching device of the present invention, wherein (a)
Is a plan view, (b) is a front view, and (c) is a side view.

FIGS. 2A and 2B show an oil mist trapping filter used in the first embodiment; FIG. 2A is a perspective view, and FIG.

FIG. 3 shows a high-temperature solid separation apparatus used in the same as above, and (a)
1 is a schematic plan sectional view, and FIG. 1B is a schematic front sectional view.

FIG. 4 is a schematic configuration diagram of the fire extinguisher according to the first embodiment.

FIG. 5 is a schematic perspective view for illustrating an order in which the fire extinguishing agent adheres to the filter for catching oil mist and is clogged.

FIG. 6 is a schematic cross-sectional view for illustrating an order in which the fire extinguishing agent is attached to the filter for catching oil mist and clogged.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blowing path 2 Blower 3 Filter for catching oil mist 4 Fire extinguishing nozzle 5 High temperature solid separation device 10 Separation box 10a Side wall 11 Exhaust cylinder 11a Lower end opening 12 Exhaust inlet 13 Separation flow path 14 Reservoir

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Echiichi Kawakami 1-20-19 Shimanouchi, Chuo-ku, Osaka-shi Inside Craco Co., Ltd. (72) Inventor Akira Yamada 1-20-19 Shimanouchi, Chuo-ku, Osaka-shi F-term in Craco Co., Ltd. 4D053 AA03 AB01 BA01 BB06 BC01 BD04 CB01 DA03 4D058 JA12 QA01 QA07 QA09 QA21 SA15 UA11

Claims (2)

[Claims] 1. An air blast path through which exhaust gas containing oil mist is introduced, a blower provided in the air blast path for introducing exhaust gas into the air blast path, and an oil mist trap provided in the air blast path High-temperature solids separation device that separates high-temperature solids, such as high-temperature chips and dust, contained in the exhaust containing oil mist provided on the windward side of the filter for capturing oil mist in the ventilation path from the exhaust When,
A fire extinguishing nozzle for discharging a fire extinguishing agent on the leeward side of the filter and on the leeward side of the high-temperature solids separation device and clogging the filter with the discharged fire-extinguishing agent, wherein the high-temperature solids separation device is located in the main flow area of the exhaust gas. A separate section for separating hot chips and high-temperature dust in the exhaust air, and a reservoir for depositing the separated chips and dust at a position away from the main exhaust area. An oil mist capturing device characterized by the following. 2. An upper part of a separation box having a rectangular cross section is used as a separation part for separating high-temperature chips and dust from exhaust gas, and a lower part of the separation box is used for collecting the separated chips and dust. A high-temperature solids separator is configured as a reservoir, and an exhaust pipe that communicates the inside of the separation box with a downstream filter is inserted into the separation box, an exhaust inlet is provided on a side wall of the separation box, and the exhaust inlet is exhausted. A separation flow path through which the exhaust gas flowing from the exhaust inlet flows between the periphery of the exhaust cylinder and the upper side wall of the separation box having a rectangular cross section and located above the lower end opening of the cylinder, and flows to the lower end opening of the exhaust cylinder. An oil mist trapping device characterized by comprising: