JP2003248158A - Clean space forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clean space forming apparatus with a simple and robust structure capable of keeping a surface of a surveillance camera lens, etc., clean for a long time even when the surveillance camera is installed under a corrupt environment. <P>SOLUTION: The clean space forming apparatus is provided with a first pillar space 1, a second space 2 disposed around an outer side face of the first space, partitions 3 for dividing the first and the second spaces, an end wall 5 for blocking one of both end openings of the first space, an outer wall 4 for enclosing and blocking the second space, and a gas supply means 6 for supplying gas to the second space blocked by the outer wall. At least a part of the partition is formed from an infiltration part for equally passing the gas from the second space to the first space. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a device for forming a clean space in a polluted environment. More specifically, the present invention relates to a clean space forming device capable of preventing generation of turbulent flow in a space and keeping a surface of a lens of a television camera facing a polluted environment clean for a long period of time.

[0002]

2. Description of the Related Art In a polluted environment facility such as a continuous annealing furnace or a continuous molten zinc plating line (CGL) where a large amount of dust is generated, in order to accurately grasp the internal condition and reflect it in operation management, From the monitoring window provided on the wall surface, while irradiating the illumination toward the inside, using visual observation or a monitoring camera,
It is widely practiced to monitor the internal conditions of polluted environment facilities.

However, since the inside of the polluted environment equipment is in a dusty atmosphere, it takes a relatively short time from the start of observation.
Even if these dusts adhere to the inner surface of the glass of the monitoring window and illuminate the inside, it is not possible to monitor the inside of this polluted environment facility visually or by using a monitoring camera, etc. ) Makes it impossible.

In order to solve such a problem, in Japanese Patent Application Laid-Open No. 2004-242242, an air flow directed obliquely forward from the vicinity of the tip of the camera case and an air flow directed from the periphery of the front surface of the transparent plate provided in the camera case toward the center. Is disclosed to prevent the dust from being entrained by the air due to these air flows and prevent the dust from entering the air purge hood.

Further, in Patent Document 2, air is blown into the camera housing from an opening at the rear of the camera arranged in the camera housing, and this airflow is passed through a hood extending further forward than the opening at the front of the camera to the outside. There is disclosed a method of preventing dust from adhering to a camera lens by a structure that allows the dust to flow out to the camera lens.

In Patent Document 3, a double hood is attached to the ultrasonic sensor, and a purge gas is continuously ejected from the inside of the hood to the center to prevent dust from adhering to the transmitting / receiving surface of the ultrasonic sensor. A structure is disclosed.

In Patent Document 4, the purified gas is fed to the nozzle adjacent to the optical plane by the first gas feed means to generate the first purified gas flow in the nozzle, and the second gas feed means is used. A configuration has been proposed in which the gas in the first purified gas stream is placed on the second purified gas stream and is drawn forward through the nozzle to purge the inside of the monitoring window.

Further, in Patent Document 5, a slit is provided on the side wall of the snout of the plating bath, and a slit through which the first gas is flown is provided inside the snout so as to observe the inside of the snout. A snout for a plating bath with a monitoring window for supplying a second gas between the transparent body and the transparent body has been proposed.

Further, in Patent Document 6, an air passage is formed so as to surround a predetermined surface of a transparent plate, and an air intake for supplying air into the air passage and an air discharge outlet for discharging air in the air passage. The air discharge port is provided so as to surround the predetermined surface at a position close to a plane including the predetermined surface, and the air discharged from the air discharge port has a predetermined surface. An air purge hood has been proposed which is oriented along the center of the hood.

[Patent Document 1] Japanese Patent Laid-Open No. 2001-108880

[Patent Document 2] JP-A-6-167670

[Patent Document 3] JP-A-11-30548

[Patent Document 4] JP-A-8-234134

[Patent Document 5] Japanese Patent Laid-Open No. 11-302808

[Patent Document 6] Japanese Patent Laid-Open No. 7-72541

[0010]

However, in any of the inventions disclosed in Patent Document 4 and Patent Document 5, it is necessary to supply two gases in separate systems. Therefore, the structure of the device becomes complicated, and a vortex is generated unless the pressures of these two gases are properly adjusted, and there is a high possibility that the field of view cannot be sufficiently secured for a long period of time.

On the other hand, in the inventions disclosed in Patent Documents 1 to 3 and 6, although one gas is used, if the shape of the air discharge port is not accurate, a vortex is generated in the hood, and the field of view is also long-term. There is a high possibility that it will not be possible to secure a sufficient amount.

An object of the present invention is to provide a clean space forming device capable of keeping the surface of a surveillance camera lens and the like clean for a long period of time even in a polluted environment with a simple and robust structure.

[0013]

As described above, conventionally, for example, dust, smoke, water vapor and
In order to prevent the Zn fume, etc. from adhering to the surface of the surveillance camera lens, etc., a contaminated atmospheric gas containing dust can be viewed by generating an air flow with a relatively large flow velocity in front of the surface of the surveillance camera lens, etc. The so-called air purge method was used to block the flow into the space.

However, the air purging method cannot reliably and inexpensively secure a sufficient field of view for a long period of time. Therefore, as a result of intensive studies by the inventor of the present application, the airflow generated in the field of view space is used for pollution. Rather than blocking the inflow of atmospheric gas, by supplying the gas extremely gently and uniformly so that turbulence hardly occurs in the visual field space, a gentle gas flow is revealed. The present invention has been completed through further studies, finding that it is possible to solve the above problem. The present invention will be specifically described below. In addition, in order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated forms.

A first aspect of the present invention is a partition wall for partitioning a first space (1) having a columnar shape, a second space (2) arranged around the outer surface of the first space, and the first space and the second space. (3), an end wall (5a) that closes one of both end openings of the first space, and an outer wall (4) that closes the second space so as to wrap it from the outside.
And gas supply means (6) for supplying gas to the second space closed by the outer wall, and at least a part of the partition wall is formed by a permeation part that allows the gas to flow uniformly from the second space to the first space. It is a clean space forming device.

In the apparatus for forming a clean space according to the first aspect, gas is first supplied by the gas supply means to the second space which is a closed space. As a result, the internal pressure of the second space is increased and a differential pressure is generated between the second space and the first space. Then, at least a part of the partition wall that separates the first space and the second space is configured by the permeation part that allows the gas to flow therethrough, so that the gas supplied to the second space is separated from the permeation part to the first space. Is distributed to. Here, since the flow of the gas through the permeation part is uniform, the partial turbulent flow due to the flow of the gas from the second space to the first space hardly occurs. Moreover, since one end surface of the first space is open,
The gas that has flowed from the second space to the first space is discharged slowly and without delay through the entire opening. In this way, the first space is kept slightly higher than the external pressure, and the dust and other pollutants existing in the external space become the first because the phenomenon in which dust and the like are trapped in the first space due to turbulent flow is unlikely to occur. It can be prevented from flowing into one space.

In the above aspect, the shape of the permeation portion may be cylindrical.

In this way, with respect to the circular cross-sectional shape, a uniform gas flow in the diametrical direction is secured over the entire circumference, so that turbulent flow is even less likely to occur. Further, it becomes easy to keep the mechanical strength of the permeation part high.

When the length of the permeating portion is L and the diameter is D in the above structure, L is between L and D.
You may comprise so that the relationship of> D may be materialized.

In the case of such a structure, even if the flow of the external gas becomes strong, contaminants such as dust existing in the external space flow into the first space through the opening of the first space. In that case, the influence can be limited to a part near the opening, and the ratio of the inside of the first space contaminated with the contaminant can be suppressed to be low.

In the above embodiment, the entire partition wall (3) may be composed of the permeation part.

In the case of such a configuration, the area in which the uniform gas flow is performed from the second space to the first space is increased, so that it is possible to further suppress the generation of turbulence.

Further, in the above aspect, the permeation portion may be formed of a porous material.

In this way, the gas is evenly distributed from the second space to the first space through many holes of the permeation part,
Generation of turbulence is suppressed.

Further, in the above embodiment, the permeation part may be formed by the filter material of the filter. The term "filter" as used herein means a filter for filtering a fluid such as a liquid or a gas, and does not include a filter that selectively transmits sound, light, electromagnetic waves and the like.

In the case of such a construction, since the filter medium of the filter available in the market can be used as the material of the permeation part, it is not necessary to prepare the material of the permeation part, and the material can be obtained. Is easy. Further, since the filter medium of the filter is formed porous, the gas is evenly distributed from the second space to the first space through many holes,
Generation of turbulence is suppressed. Furthermore, since the holes inside the filter medium of the filter are oriented in random directions, the directions of the portions where these holes open toward the first space are also random. Therefore, the gas permeated from the second space through the filter medium has random discharge directions from the holes to the first space, which cancel each other out in the diametrical direction and further suppress the generation of turbulence.

In the case of the above structure, the filter medium of the filter may be composed of sintered metal.

According to this structure, it is possible to form an infiltrating portion having high heat resistance and high rigidity. Further, since the sintered metal and other metal can be easily joined, a clean space forming device that is easy to manufacture can be configured. The filter material of the sintered metal filter is obtained by sintering a metal in the form of powder, mesh, fiber or the like, and any of these can be used in the present invention. As the type of metal, stainless steel, bronze and the like can be easily obtained in the market, but the present invention is not limited to these. However, when used in a corrosive atmosphere, it is preferable to use a stainless sintered metal filter.

The filter medium of the filter may be made of ceramic.

With this structure, it is possible to form a permeation part having high corrosion resistance, heat resistance and rigidity. In addition, cylindrical sintered metal filters and ceramic filters of various sizes (inner diameter, outer diameter, length) can be easily obtained in the market, which is advantageous in terms of production.

Furthermore, the filter medium of the filter may be made of paper, non-woven fabric, woven fabric, or glass fiber.

In this way, the permeation part can be made of a material that is relatively easily available, inexpensive, and lightweight.
In addition, when the nonwoven fabric of the filter medium and the woven fabric are composed of synthetic fibers,
When it is composed of the glass fiber and the glass fiber, it is possible to form the permeation part having low reactivity and high corrosion resistance. When these materials are used as a filter medium, it is desirable to stack sheets of each material in order to ensure uniform filtration in the surface direction and to improve filtration accuracy.

In the case where the permeation part is constituted by the filter medium of the filter as described above, further, as a liquid filter of the filter medium,
JIS B 8356-8 (2002) (ISO 16
The average filtration ratio (β value) of 889 (1999) multipass test method may be β50 ≧ 75.

The above-mentioned β value indicates that an object to be filtered having a diameter of 50 μm is filtered by 75% or more by passing through the filter. Therefore, from the second space to the first space through the permeation section composed of a fine porous filter medium having such filtration accuracy.
Since the gas is evenly distributed to the space, turbulence is prevented from occurring in the first space.

When the permeation section is formed of the filter material of the filter as described above, the filtration accuracy of the filter material as a gas filter may be a nominal value of 20 μm or less.

Even with this structure, the gas is evenly circulated from the second space to the first space through the permeation section made of a fine porous filter medium, so that turbulence occurs in the first space. Flow is prevented from occurring.

In the above aspects, the differential pressure ΔP between the first space (1) and the second space (2) separated by the partition wall (3) can be set within the range of ΔP ≦ 1 × 10 ⁵ Pa. Thus, the gas supply means (6) may be provided.

In the case of such a construction, the pressure difference between the two spaces does not become larger than a predetermined value, so that the gas flow rate from the second space to the first space is suppressed to a low level and the gas flows gently. Is ensured and turbulent flow is prevented from occurring in the first space. Such a gas supply means can be realized by, for example, an apparatus equipped with an air compressor and a pressure adjusting valve.

In the above aspects, the hood (4c) may be provided in the opening (11) on the open side of the first space (1).

In this way, even if the flow of the external gas becomes strong and the contaminants such as dust existing in the external space from the opening of the hood may flow into the hood, The effect can be kept in the hood,
It is possible to prevent the inside of the first space from being contaminated with contaminants.

In the above embodiment, the outer wall (4) may be provided with cooling means and / or heating means.

According to this structure, the temperature in the first space can be maintained at an appropriate temperature within a predetermined range even if the outside has a high temperature or a low temperature environment. For example, a sensor or the like is provided in the first space. When such a detector is housed to perform a predetermined measurement, it is possible to suppress the occurrence of a measurement error due to the influence of temperature.

In a second aspect of the present invention, the clean space forming device (10) of the first aspect is provided on the wall surface of the equipment (22, 32, 40, 50) having the polluted environment space (DA) inside.
(Including each modification), the end wall (5a) of the clean space forming device faces the outside of the equipment, and
The visibility securing device (20) is characterized in that the space (1) is arranged so as to communicate with the polluted environment space.

The term "polluted environment space" as used herein means that minute substances such as dust and metal fumes float or settle at a minute speed, and these transmit light to secure a field of view such as a glass surface. When attached to the surface of a member to be heated, it refers to the environmental space of the atmosphere that causes the visibility to deteriorate. Further, the "polluted environment facility" means a facility having the polluted environment space inside or in and around the inside. Furthermore, "attached to the wall surface" means not only the case where it is directly attached to the wall surface, but also the case where it is attached to the wall surface through a flange or the case where it is attached to the wall surface through a flange that is attached protruding from the wall surface. It is a concept that also includes. The clean space forming device prevents such contaminants such as floating from entering the first space, so that the visual field inside the visual field securing device according to the second embodiment is secured.

In the second aspect, as the structure of the visibility securing device attached to the equipment, it is sufficient that the first space and the polluted environment space are continuous spaces, and the vision securing device projects to the inside of the equipment. It may be provided on the contrary, or may be provided so as to project to the outside of the equipment.

Further, the television camera (23) and / or the light source (2) are provided near the outside of the end wall of the visibility securing device.
It is also possible to configure a monitoring device for equipment having a polluted environment space where 5) is arranged.

In this case, the end wall surface of the clean space securing device is formed of a transparent glass or synthetic resin (acryl, polystyrene, polycarbonate, polyethylene terephthalate (PET)) plate. When configured in this manner, the end wall surface of the clean space securing device facing the polluted environment equipment is kept clean, so that the inside of the equipment can be monitored by the TV camera through the end wall surface and the end portion. It is possible to project light into the equipment through the wall surface and monitor it visually. Such a monitoring device is arranged in the vicinity of the snout zinc bath surface and is preferably used for monitoring the zinc bath surface in the continuous molten zinc plating device snout. In this case, since it is possible to prevent dirt from adhering to the end wall surface, the zinc bath surface in the snout can be observed by a television camera for a long time without maintenance. Further, it is arranged near the top of the heating zone furnace and is suitably used for the meandering monitoring of the running zone in the continuous annealing furnace. In this case as well, the position (deviation) of the steel sheet traveling in the continuous annealing furnace for a long period of time can be similarly monitored without polluting the end wall surface.

A third aspect of the present invention is the polluted environment space (D
A first space (1) of the clean space forming device (10) (including each modified example) provided in A) according to the first aspect.
Inside the detector (90, 101a, 101b, 111, 12
1, 131) and a detection device (100,
100a, 100b, 110, 120, 130)). The detection device may be provided in the polluted environment space of the polluted environment facility.

According to the detecting device of the third aspect, since the detector is provided inside the clean space forming device, the entire detecting device can be made compact. Further, since the detector and the clean space forming device are integrated and it is not particularly required to be attached to a specific portion, it is possible to freely move and relocate in the polluted environment space.

In the above embodiment, any one of a television camera, a radiation thermometer, a photo sensor and an ultrasonic sensor may be used as the detector.

In the detection device of the third aspect, the space in which the detector is located and the polluted environment space are continuous spaces, and there is no such thing as a glass plate separating the detector and the polluted environment space. Therefore, it is possible to directly detect the information from the object to be detected by the detector. In addition to TV cameras, if there is a glass plate etc. between non-detected objects, it is impossible to measure or obtain accurate measurement values, radiation thermometer, transmission type and reflection type photo sensor, ultrasonic sensor, etc. Can be placed in the first space to perform predetermined observation and measurement in the polluted environment facility.

As a concrete mode of the detection device according to the third mode, the polluted environment facility is a continuous molten zinc plating device (CGL), and the detector is a continuous molten zinc plating device of the snout zinc bath surface. It may be configured as a surveillance television camera.

By doing so, the snout zinc bath surface of the continuous molten zinc plating apparatus can be observed by the television camera for a long period of time without soiling the camera.

As another specific embodiment of the detecting device according to the third embodiment, the polluted environment facility may be constituted by a continuous annealing furnace, and the detector may be constituted by a steel plate position sensor at the top of the heating zone of the annealing furnace.

By doing so, the positional deviation of the steel sheet at the heating zone furnace top of the continuous annealing furnace can be monitored for a long time without polluting the sensor.

Furthermore, it is also possible to construct equipment incorporating such a detection device. For example, the clean space forming device and the television camera disposed inside the first space of the clean space forming device can be configured as a continuous molten zinc plating device provided near the snout zinc bath surface.

Further, the clean space forming device and the position sensor arranged inside the first space of the clean space forming device may be provided as a continuous annealing furnace provided near the plate running portion.

The operation and gain of the present invention will be apparent from the embodiments described below.

[0059]

1 is a schematic sectional view showing a clean space forming device according to the present invention. As shown in the figure, the clean space forming device 10 includes a columnar first space 1, a second space 2 arranged around the outer surface of the first space, the first space 1 and the second space 2. Partition wall 3 for partitioning the
An end wall 5a that closes one of both end openings of the space 1, a cylindrical outer peripheral wall 4a that shares an axis with the partition wall 3 and is arranged on the outer peripheral side of the second space 2, and an end wall 5a. The first ring portion 5b extending in the outer peripheral direction of the outer peripheral wall 4a to the one end side (the left side in the drawing) of the outer peripheral wall 4a, and the radially inward extending from the other end side (the right side in the drawing) of the outer peripheral wall 4a. Second ring portion 4b
And a gas supply means 6 for supplying a gas to the second space 2. The outer peripheral wall 4a, the first ring portion 5b, and the second ring portion 4b form the outer wall 4 of the second space 2 and close the second space 2 when combined with the partition wall 3.

To be precise, the end wall 5a refers to only a portion that closes the end surface of the first space 1, but the first ring portion 5b extends on the outer peripheral portion of the end wall 5a. In the embodiment, both are integrally formed, and therefore, both will be described as the end wall 5 for convenience in the following description. Although not shown, between the partition wall 3 and the outer wall 4,
A packing or the like is appropriately interposed between the partition wall 3 and the end wall 5 and between the outer wall 4 and the end wall 5 to ensure airtightness. The opening 11 provided on the opposite side of the end wall 5 of the first space 1 is open to the outside. The outer peripheral wall 4a is formed to have substantially the same length as the partition wall 3, and a hood 4c is attached to the opening 11 side.

Each member constituting the clean space forming device 10 will be described below.

(Partition Wall 3) The partition wall 3 has a purpose of allowing the gas supplied from the gas supply means 6 to the second space 2 to flow into the first space 1. A porous filter medium is used so that turbulent flow does not occur in the first space 1 due to the gas flowing therethrough. Specifically, in the following embodiments,
As a sintered metal filter, EB (nominal filtration accuracy: 10 μm, material: bronze) manufactured by SMC Corporation is used.

Fine pores are formed in random directions in the sintered metal filter. Therefore, an infinite number of openings, which can be said to be innumerable, are formed in a random direction from the inside of the sintered metal filter to the inner peripheral surface side of the sintered metal filter.

When a sintered metal is used as the filter material of the filter, the material of the metal is not particularly limited, but in the market, materials made of copper-based metal or stainless steel are relatively easily available. is there. If the gas to be used is reactive or if the environment in which it is used contains corrosive substances, it is desirable to use a filter medium made of a stainless steel-based sintered metal. In any case, if a sintered metal is used as a filter medium for the filter, a partition wall having high rigidity and high heat resistance can be formed.

As the sintered metal, there are a metal powder obtained by sintering at a temperature and a pressure, a sheet processed in advance into a mesh shape and laminated at a pressure. In the present invention, either is used. This type can also be used.

As the filter material of the filter, in addition to sintered metal, a filter material of a ceramic filter can be preferably used from the viewpoint of rigidity, heat resistance and the like. Further, paper, non-woven fabric, woven fabric, glass fiber and the like can be used. Of these, it is desirable to use a ceramic filter for use in high temperature and corrosive environments. Also,
Glass fibers and synthetic resin fibers are recommended for use in highly reactive gases and in corrosive environments. In addition, when paper, non-woven fabric, woven fabric or the like is used as the filter medium, there is an advantage that the weight of the entire clean space forming device 10 can be reduced.

When the permeation part is constituted by the filter material of the filter as described above, JIS as a liquid filter of the filter material is used.
B 8356-8 (2002) (ISO 16889)
(1999) multi-pass test method average filtration ratio (β
The value) is preferably β50 ≧ 75, more preferably β25 ≧ 75. The filtration accuracy of the filter material as a gas filter is preferably 20 μm or less in nominal value.
It is preferably about 0 μm. Since the gas is evenly distributed from the second space to the first space through the permeation part formed of a fine porous filter medium having such filtration accuracy, turbulent flow occurs in the first space. Is prevented.

From the viewpoint of ensuring a uniform gas flow, it is preferable that the entire partition 3 is formed of a filter medium. However, the present invention is not limited to this, and the filter medium may be a part of the partition wall 3 as long as a uniform gas flow can be secured. For example, the filter medium may be formed in a large number of strips and arranged so as to surround the cylinder, or a plurality of ring-shaped ones having a width may be arranged in the length direction of the partition wall 3. The marks may be arranged on the entire surface of the partition wall 3, or may be arranged in a spiral band shape.

From the viewpoint of making the gas flow in the radial direction of the first space 1 uniform, the shape of the partition wall 3 is basically cylindrical. As described above, when a sintered metal filter or a ceramic filter is used as the partition wall 3, cylindrical filters having various sizes (inner diameter, outer diameter, length) and various filtration accuracies can be easily obtained from the market. Therefore, it is preferable in terms of manufacturability. In the case of a cylindrical shape, the length of the partition wall 3 may be set larger than its diameter. By doing so, even if the flow of gas outside the clean space forming device 10 becomes strong, the opening 1 of the first space 1 is
Even if pollutants such as dust existing in the outer space from 1 flow into the first space 1, the effect of the contaminants on the opening 1
Therefore, the inside of the first space 1 is less likely to be contaminated with contaminants. The shape of the partition wall 3 may be a triangular cylinder shape, a square cylinder shape, or a polygonal cylinder shape having 5 or more sides, depending on the environment in which the clean space forming device 10 is arranged. Moreover, the shape of the partition wall 3 may be a semi-conical cylindrical shape. This has the advantage that the change in flow velocity in the length direction can be reduced. Further, the partition wall 3 may be extended forward of the opening 11 side to form the hood 4c.

(Outer Wall 4) The role of the outer wall 4 in the present invention is to close the second space 2 together with the partition wall 3 and to have sufficient strength as an exterior body of the clean space forming device 10. The shape of the outer wall 4 can be freely selected from that of the partition wall 3 within such a range. In the following embodiments, the outer wall 4 is provided with respect to the cylindrical partition wall 3.
Is a cylindrical outer peripheral wall 4a sharing the axis with the cylinder of the partition wall 3
And two ring portions 5b connecting the outer peripheral wall 4a and the partition wall 3,
4b and. The hood 4c may be attached to the opening 11 as described above. Opening 1
By providing the hood on the first unit, the influence of the outside air can be reduced.

In the following embodiments, stainless steel is used as the material of the outer wall 4, but in addition to metals such as titanium, copper, true casting, cast iron, steel and aluminum, the temperature conditions of the environment in which it is used are taken into consideration. It is also possible to use plastic, glass or ceramics. When the environment in which the clean space forming device 10 is placed is at a high temperature, a water jacket is provided on the outer wall 4 to bring the inside of the clean space forming device 10, particularly the first space 1, to a predetermined temperature (range) by water cooling. You may keep it. Further, when the environment in which the clean space forming device 10 is placed has an extremely low temperature and there is a possibility that the functions of the sensor and the like arranged inside the first space may deteriorate, the outer wall 4 is provided with a heating means such as a heating wire. 1 space 1
May be maintained at a predetermined temperature (range).

(End Wall 5) To be exact, as described above, the end wall is a member for closing one opening of the partition wall 3 designated by the reference numeral 5a, but the first ring portion on the outer periphery thereof. 5
It is convenient for manufacturing reasons that it is formed integrally with b and that the first space and the second space are closed by the integrally formed member (end wall 5). Therefore, here, the end wall 5a and the first ring portion 5b are integrally treated as the end wall 5.

The end wall 5 is the clean space forming device 1 of the present invention.
At 0, it has a role of closing the first space 1 and the second space 2 from the end face side. In the following embodiments, since the partition wall 3 and the outer peripheral wall 4a of the outer wall are formed in a cylindrical shape, the end wall 5 is formed in a disc shape.

As will be described in detail in each embodiment, when there is a surveillance television camera, a light source, and an observation point outside the end wall 5, the end wall 5 needs to be observed, so that the end wall 5 is transparent. Such as glass, acrylic, polystyrene, polycarbonate, polyethylene terephthalate (PE
It is made of synthetic resin such as T). On the other hand, when the TV camera and the sensors are arranged inside the first space 1, the material of the end wall 5, like the material of the outer wall 4, is stainless steel, titanium, copper, brass, In addition to metals such as cast iron, steel and aluminum, plastics and ceramics can be used in consideration of the temperature conditions of the environment in which they are used.

When the light source is arranged inside the first space 1, the side of the end wall 5 facing the first space 1 may be a mirror surface in order to enhance the luminous efficiency of the light source. Further, when the internal light source is a point light source, the end wall 5 is formed into a paraboloid, and if the inner surface is a mirror surface and the light source is properly arranged, light with a high degree of straightness can be supplied. Is also possible.

(Gas Supply Means 6) The gas supply means 6 supplies a gas of a predetermined type (air, nitrogen gas (N ₂ ) or the like in the following embodiments) to the second space 2, and the second space 2 Two
The purpose is to generate a predetermined pressure difference between the first space 1 and the first space 1.

The gas supply means 6 is composed of a gas compression means 7 such as a compressor, a pressure adjusting valve 8, a pressure gauge 18, and a pipe 9 connecting these to the clean space forming device 10. Although illustration of the gas supply means 6 may be omitted in the following figures, the clean space forming device 10 is always provided with the gas supply means 6.

(Operation) In this clean space forming device 10, first, the compressor 7 of the gas supply means 6
Compressed air is formed, and the compressed air is adjusted to a predetermined pressure by the pressure adjusting valve 8 and then supplied to the second space 2 which is a closed space. As a result, the internal pressure of the second space is increased to the above-mentioned predetermined pressure, and the differential pressure ΔP is generated between the second space 2 and the first space 1. Then, since the partition wall 3 partitioning the first space 1 and the second space 2 is formed of a sintered metal capable of circulating air, the air supplied to the second space 2 is a sintered metal serving as a filter medium. And then distributed to the first space 1. Here, since the sintered metal has a large number of pores formed therein in a fine and random direction, which can be said to be innumerable, the air flow inside the sintered metal as a filter medium becomes uniform. A myriad of openings, which can be said to be innumerable, are formed in a random direction from the inside of the sintered metal to the inner peripheral surface side of the filter, that is, the first space 1 side.

Therefore, partial turbulence due to the movement of air from the second space 2 to the first space 1 is unlikely to occur. Also the first
Since one end surface of the space 1 is the opening 11, the air circulated from the second space 2 to the first space 1 is discharged gently and without delay through the entire opening 11 to the outside. To be done. In this way, the first space 1 is kept slightly higher than the external pressure, and the phenomenon of dust and the like being caught in the first space 1 due to the occurrence of turbulence is unlikely to occur. Therefore, it is possible to prevent contaminants such as dust existing in the external space from flowing into the first space 1. <First Embodiment> FIG. 2 is a schematic sectional view showing a visual field securing device according to the first embodiment. This visual field securing device 20
Is the wall surface 2 of the facility 22 having the polluted environment space DA inside.
1, the opening 11 side of the clean space forming device 10 is attached. Therefore, the clean space forming device 10
Most of these are arranged so as to project from the wall surface 21 of the equipment 22 to the outside of the equipment. First space 1 of clean space forming device 10
Is communicated with the polluted environment space DA. The end wall 5a of the clean space forming device 10 is made of a transparent material such as glass. A TV camera 23 is arranged further outside the end wall 5a, and a lighting 25 is installed behind it. With such a configuration, the inside of the facility 22 having the dirty space DA can be monitored by the television camera 23. Since the transparent glass wall 5a and the polluted environment space DA are separated by the first space 1 which is a clean space, the glass wall 5a is not contaminated by dust or the like floating in the polluted space, and the TV camera 23 is used. It is possible to carry out monitoring for a long period without maintenance. The same effect can be obtained even when only the light source (illumination) is arranged without arranging the television camera 23 and the inside of the equipment 22 is observed with the naked eye.

FIG. 3 is a schematic sectional view showing another visual field securing device according to the first embodiment. This visual field securing device 30
Is the wall surface 3 of the equipment 32 having the polluted environment space DA inside.
1, the end wall 5a side of the clean space forming device 10 is attached (in FIG. 3, the smudged portion represents the polluted environment space DA). Therefore, most of the clean space forming device 10 is arranged so as to project from the wall surface 31 of the equipment 32 into the equipment. Also in this visual field securing device 30, the first space 1 of the clean space forming device 10 communicates with the polluted environment space DA. The end wall 5a of the clean space forming device 10 is made of a transparent material such as glass. A television camera 23 is arranged further outside the end wall 5a, and the illumination device 2 is provided behind it.
5 are installed. With such a configuration, the inside of the facility 32 having the dirty space DA can be monitored by the television camera 23. Transparent glass wall 5
Since the "a" and the polluted environment space DA are separated by the first space 1 which is a clean space, the glass wall 5a is not contaminated by dust or the like floating in the polluted space and can be monitored by the TV camera 23 for a long time. It will be possible to do maintenance-free. The same effect can be obtained when the interior of the equipment 32 is observed with the naked eye by arranging the lighting device 25 at a position directly facing the end wall 5a without disposing the television camera 23.

(Example 1-1) FIG. 4 is a schematic view showing a visual field securing device according to the first embodiment applied to a snout of a continuous molten zinc plating device. Wall surface 41 of the snout 40
The visual field securing devices 42a, 42b according to the present invention
Is attached. In this embodiment, the end wall 5
5a and 55b are made of transparent glass so that the inside of the snout 40 can be seen. Television cameras 44a and 44b are arranged behind the visual field securing devices 42a and 42b, respectively, and illuminations 43a and 43b are provided behind them. In the snout 40, the steel plate S is driven from above by being driven by the sink roll 49 and the like. A plating tank 45 filled with molten zinc is provided below the snout 40. In the vicinity of the molten zinc liquid level 46 in the plating tank 45, suction ports 4 of suction pipes 47a, 47b for sucking out scum, slag, etc., which adversely affects the surface property of the steel sheet to be plated, to the outside of the system.
8a and 48b are provided.

The television cameras 44a and 44b monitor the molten zinc liquid level 46 and the steel plate S running in the vicinity thereof to prevent scum from adhering to the steel plate surface. The inside of the snout 40 of the continuous molten zinc plating apparatus having such a structure is a polluted space referred to in the present application that is heavily contaminated with zinc fume or the like. However, since the glass surfaces of the end walls 55a and 55b are kept clean by the visual field securing devices 42a and 42b according to the present invention, the television cameras 44a and 44b are not affected by the contaminants in the snout 40 for a long time. It is possible to continue monitoring within the snout 40 by.

In the visual field securing devices 42a and 42b,
Is the differential pressure between the first space 1 and the second space 2 is 2 × 10⁵
It is preferably Pa or less, more preferably 1 ×.
10 ⁵Pa or less.

The pressure measurement values of the respective parts of this embodiment in the actual machine are as follows: Second space: atmospheric pressure + 2.2 × 10 ⁴ Pa First space: atmospheric pressure + 0.6 to 0.7 × 10 ⁴ Pa in snout : Atmospheric pressure + 0.05 × 10 ⁴ Pa.

According to this embodiment, as described above, the first
Since the space 1 can be kept clean, this end wall 5
5a, 55b can be prevented from being soiled for a long time (for example, about 6 months), and the transparent glass surfaces on the inner surfaces of the end walls 55a, 55b can be maintained in a clean state for a long time. The visual fields of 44a and 44b can be secured.

(Embodiment 1-2) FIG. 5 is an explanatory view showing a partially simplified view of a situation in which the visual field securing device 51 is configured by applying the clean space forming device 10 according to the present invention to the continuous annealing furnace 50. Is. FIG. 6 is a vertical cross-sectional view passing through the longitudinal axis of the visual field securing device 51 in FIG. further,
FIG. 7 is an enlarged view of a portion VII indicated by a chain double-dashed line in FIG. In FIGS. 6 and 7, in order to emphasize the flow of clean air, the clean air supplied from the air supply means to the second space and the first space is represented by a large number of “dots”. On the other hand, in Fig. 6, many dust particles in the polluted space are separated into "small pieces".
It is represented by.

As shown in FIGS. 5 to 7, the clean space forming apparatus 10 is attached to the furnace wall of the continuous annealing furnace 50 by a flange. It should be noted that, as shown in detail in FIG. 7, the second ring portion 4b is provided on the tip side (right side in the figure) of the second space 2.
Is provided, and a packing 70 is provided further outside the second ring portion 4b. A flange 71 is provided on the outside of the packing 70. Flange 71
As shown in FIG. 5, is abutted against a flange 72 provided on the furnace wall surface of the continuous annealing furnace 50, and is fixed by a fastening bolt 73.

A flange 74 is provided at the outer surface end of the partition wall 3 on the side of the continuous annealing furnace 50 (on the left side in the figure), and the glass end portion is provided on the inner surface of the partition wall 3 provided with the flange 74. The wall 76 is fixed. As a result, one of the openings of the first space 1 and the second space 2 is closed by the glass end wall 76 in a sealed state.

The outer surface of the flange 74 is shown in FIGS.
As shown in, the flange 75 provided at the front end of the photographing optical system of the optical photographing device 79 such as a camera is fastened and fixed via the end wall 76. An illumination device 78 is arranged behind the optical photographing device 79 such as a camera.

On the outer surface of the outer peripheral wall 4a covering the second space, the air supply hole 7 connected to the pipe 9 of the gas supply means 6 is provided.
7 is provided. The length of each of the outer peripheral wall 4a and the partition wall 3 in the extending direction depends on the size (weight) and amount of dust and the like existing in the continuous annealing furnace 50, the flow velocity of the base gas flowing inside, and the like. It may be set appropriately. For example, when the amount of dust or the like is large, the lengths of the outer peripheral wall 4a and the partition wall 3 in the extending direction may be set appropriately long.

Further, the end wall 76 closes the entrance on one side of the openings of both ends of the partition wall 3 and the outer peripheral wall 4a in a sealed state by interposing the packing 70.

Of the both ends of the partition wall 3, the opening 11 at the end on the side where the end wall 76 is not provided is provided in the continuous annealing furnace 50.
It is configured to point to the inside of and communicate with this inside.

Note that, unlike the present embodiment, the end wall 7
6 is constituted by the lens of the photographing optical system of the optical photographing device, in other words, the lens of the photographing optical system of the optical photographing device is provided at each end of the partition wall 3 and the outer peripheral wall 4a via the packing 70. May be directly fixed.

As described above, by applying the above-mentioned clean space forming apparatus 10 to the continuous annealing furnace 50, the clean first space 1 for externally monitoring the inside of the continuous annealing furnace 50.
Therefore, it is possible to prevent dirt from entering the first space 1 for a long period of time.

Visual field securing device 42 of Examples 1-1 and 1-2
According to a, 42b, 51, the air exuding from the entire inner peripheral surface of the partition wall 3 forms a gentle airflow from the inside of the first space 1 to the polluted environment space DA inside the snout 40 or inside the continuous annealing furnace 50. As a result, it is possible to prevent the entrainment of the airflow that causes dirt attached to the glass end walls 55a, 55b, 76, and thus prevent dirt and dust from entering the end walls 55a, 55b, 76. As a result, it is possible to reliably ensure a clear and cloudless visual field space for a long period of time.

Further, the visual field securing devices 42a, 42b, 51 of Examples 1-1, 1-2 have a simple mechanism, a small number of parts, are inexpensive, and require almost no running cost. Especially, since it has a simple and robust structure, there are few failures. Therefore, it is easy to secure a large-diameter field of view, and the compatibility with industrial instruments is extremely high.

Further, since the visual field securing devices 42a, 42b, 51 of Examples 1-1, 1-2 can be installed outside the snout 40 or the continuous annealing furnace 50, they are used particularly at low and medium temperatures. In this case, it is not necessary to provide a special cooling mechanism. When used in a high-temperature atmosphere, for example, a double-tube structure in which a third side wall member (not shown) is provided outside the outer peripheral wall 4a is sufficient to maintain a simple structure. It is also easy to give good cooling performance.

(Embodiment 1-3) FIG. 8A is a horizontal sectional view showing an example in which three oval observation windows having a small diameter are arranged in parallel to form an oval observation window. In addition, FIG.
It is a schematic perspective view which shows the arrangement of a viewing window. In the examples shown in these drawings, three small-diameter circular partition walls 83 are arranged side by side in the horizontal (or vertical) direction, and the periphery thereof is covered with an outer wall 84. The opening is closed by the end wall 86 in a sealed state. Air is supplied from the air supply hole 87 to the second space in the system. As a result, the small-diameter viewing windows 85a, 85b, 85
By arranging three c side by side, an oval viewing window can be formed and a wider field of view is secured.

<Second Embodiment> FIG. 9 is a schematic sectional view showing a detecting device according to a second embodiment. The detection device 100 is provided in the polluted environment space DA (in FIG. 9, the smudged portion represents the polluted environment space DA). The 1st space 1 of the clean space formation device 10 which comprises a part of detection device 100 is open for free passage to polluted environment space DA. A detector 90 such as a television camera and a sensor is housed inside the clean space forming device 10. Gas compression means outside the polluted environment space DA,
Clean air is supplied to the second space 2 from a pressure adjusting valve (neither is shown) through the pipe 99. With such a configuration, the inside of the polluted space DA can be monitored by the TV camera or a predetermined event can be detected by the sensor. Since the detector 90 is housed in the first space 1 which is a clean space, the surface of the detector 90 is not contaminated by the dust or the like floating in the polluted space (the dust or the like adheres to the surface of the detector 90. Without doing),
It is possible to perform predetermined detection over a long period without maintenance. It is also possible to arrange a light source instead of the detector 90 and configure it as a projector in the polluted environment space. First of all detectors and light sources such as TV cameras
Since the end wall does not need to be transparent when it is housed in a space, the end wall can be made of metal such as stainless steel like the outer wall. It can be easily attached to the part wall. (Example 2-1) FIG. 10 is a schematic diagram showing a case where a transmissive sensor is configured as an object detector as an example of the detection device according to the second embodiment. In this detection device, the detection devices 100a and 100b are installed in the polluted environment space DA.
The respective openings are arranged so as to face each other. A light emitting element 101a is arranged inside the detection device 100a, and a light receiving element 101b is arranged inside the detection device 100b, and these two elements form a transmissive photosensor. The detection object 10 is provided between the detection devices 100a and 100b.
When 2a to 102c cross, the light emitted from the light emitting element 101a and sensed by the light receiving element 101b is blocked, so that passage of the detection objects 102a to 102c can be detected. (Example 2-2) FIG. 11 is a schematic view showing a case where a reflection type sensor is configured as an object detector as another example of the detection apparatus according to the second embodiment. This detector is
In the polluted environment space DA, the opening of the detection device 110 is arranged toward the object to be detected. A reflection type sensor 111 (for example, transmitting light or ultrasonic waves,
The structure of receiving the reflected wave) is housed. When the detected objects 112a to 112c cross the front of the detection device 110, the light emitted from the sensor is detected by the detected object 112a.
It is possible to detect the passage of the objects to be detected 112a to 112c by being reflected by the surfaces of to 112c and reaching the sensor again.

Further, instead of the reflection type sensor 111,
A television camera may be housed inside the detection device 110 and configured as a monitoring device in the polluted environment space DA. Further, instead of the reflection type sensor 111, a radiation type thermometer can be housed inside the detection device 110 and configured as a temperature sensor of a specific portion in the polluted environment space DA.

In any case, since the inside of the detection device is kept in a clean space, the reflection type sensor, the television camera, and the radiation thermometer are not contaminated by dust in the polluted environment space, and maintenance is performed for a long time. It is possible to make free observations. (Example 2-3) FIG. 12 is a schematic view showing an image analysis video detector configured as still another example of the detection apparatus according to the second embodiment. This image analysis video detector
The detection device 120 is arranged downward, and the television camera 121 is housed inside. The television camera 121 is usually composed of a solid-state image sensor (CCD) camera, and takes in the shape of an article placed below as an image for analysis. Such an image analysis video detector is used, for example, for the purpose of capturing an image of the product 122 in a product manufacturing line and inspecting whether a predetermined part is correctly attached to the product at a predetermined position. Further, for example, it is used to image and read a management number or the like printed on the surface of the product, and thereby perform a predetermined process. (Example 2-4) FIG. 13 is a schematic view showing an outdoor monitoring camera configured as still another example of the detection device according to the second embodiment. The present embodiment relates to the case where the open space forms the polluted environment space, not the polluted environment space inside the equipment. A television camera 131 is housed inside the detection device 130 in the open polluted environment space. Examples of such open polluted environment spaces are outdoor parking lots, intersections with heavy traffic, raw material yards in steel mills, coal yards, blast furnaces, converters and rolling mills,
The area around various cargo handling facilities for cement and grain, the area around the crater of a volcano, etc. can be suitably used in these areas for the purpose of monitoring, danger prediction, and the like. Also in this case, it is possible to prevent dust and the like from adhering to the lens surface of the television camera 131, and it is possible to use it for a long period without maintenance.

[0102]

As described above, according to the apparatus for forming a clean space of the present invention, the movement of the gas from the second space to the first space is carried out through the porous permeation section, so that the gas flow. Is performed uniformly and gently. Therefore, it is possible to suppress the generation of turbulence in the first space and prevent dust and the like existing in the polluted environment space from entering the first space. Therefore, maintenance-free monitoring can be performed over a long period of time.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a clean space forming device according to the present invention.

FIG. 2 is a schematic cross-sectional view showing the visual field ensuring device according to the first embodiment.

FIG. 3 is a schematic cross-sectional view showing another visual field ensuring device according to the first embodiment.

FIG. 4 is a schematic view showing a visual field ensuring device according to the first embodiment applied to a snout of a sub-continuous molten zinc plating device.

FIG. 5 is a schematic diagram showing a monitoring device configured by applying the visual field securing device according to the first embodiment to the heating zone furnace top of the continuous annealing furnace.

FIG. 6 is a vertical sectional view through the longitudinal axis of the monitoring device in FIG.

FIG. 7 is an enlarged view of VII indicated by a chain double-dashed line in FIG.

FIG. 8 is a vertical cross-sectional view showing an example in which three oval viewing windows having a small diameter are arranged in parallel to form an oval viewing window.

FIG. 9 is a schematic sectional view showing a detection device according to a second embodiment.

FIG. 10 is a schematic view showing a case where a transmissive sensor is configured as an object detector as an example of the detection device according to the second embodiment.

FIG. 11 is a schematic view showing a case where a reflective sensor is configured as an object detector as another example of the detection device according to the second embodiment.

FIG. 12 is a schematic diagram showing an image analysis video detector configured as still another example of the detection device according to the second embodiment.

FIG. 13 is a schematic diagram showing an outdoor monitoring camera configured as still another example of the detection device according to the second embodiment.

[Explanation of symbols]

DA polluted environment space 1 first space 2 second space 3 partition wall 4 outer wall 4c hood 5 end wall 6 gas supply means 10 clean space forming device 11 openings 20, 30, 51 visual field securing device 23 TV camera 25 lighting device (light source) ) 32, 50 equipment (50: continuous annealing furnace) 90 detectors 100, 100a, 100b, 110, 120, 130
Detection device 101a Light emitting element (detector) 101b Light receiving element (detector) 111 Reflective sensor (detector) 121, 131 TV camera (detector)

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // B01D 39/20 B01D 39/20 D G02B 27/00 A

Claims (18)

[Claims] 1. A columnar first space, a second space arranged around the outer surface of the first space, a partition wall separating the first space and the second space, and openings at both ends of the first space. An end wall that closes one of the parts, an outer wall that closes the second space so as to wrap it from the outside, and a gas supply unit that supplies gas to the second space that is closed by the outer wall, The clean space forming device in which at least a part of the partition wall is formed by a permeation part that allows the gas to uniformly flow from the second space to the first space. 2. The clean space forming device according to claim 1, wherein the permeating portion has a cylindrical shape. 3. The clean space forming device according to claim 2, wherein a relationship of L> D is established between L and D, where L is a length of the permeation portion and D is a diameter thereof. 4. The clean space forming device according to claim 1, wherein the permeation portion constitutes the entire partition wall. 5. The clean space forming device according to claim 1, wherein the permeation portion is made of a porous material. 6. The clean space forming device according to claim 1, wherein the permeation portion is formed of a filter material of a filter. 7. The clean space forming device according to claim 6, wherein the filter medium of the filter is a sintered metal. 8. The clean space forming device according to claim 6, wherein the filter medium of the filter is ceramic. 9. A J filter as a liquid filter for the filter medium.
IS B 8356-8 (2002) (ISO 168
89 (1999) multi-pass test method) The average filtration ratio (β value) is β50 ≧ 75, The clean space forming device according to any one of claims 6 to 8. 10. The clean space forming device according to claim 6, wherein a filtration accuracy of the filter medium as a gas filter is a nominal value of 20 μm or less. 11. The gas supply means is provided so that a pressure difference ΔP between the first space and the second space separated by the partition wall can be set in a range of ΔP ≦ 1 × 10 ⁵ Pa. The clean space forming device according to any one of claims 1 to 10. 12. The clean space forming device according to claim 1, wherein a hood is provided at an opening of the first space on the open side. 13. The clean space forming device according to claim 1 is attached to a wall surface of a facility having a polluted environment space therein, and the end wall of the clean space forming device is the facility. The visibility securing device is arranged so as to face the outside of the vehicle and the first space communicates with the polluted environment space. 14. A device for monitoring equipment of the visibility securing device according to claim 13, which has a polluted environment space in which a television camera and / or a light source is arranged near the outside of the end wall. 15. A continuous molten zinc plating apparatus provided with the monitoring apparatus according to claim 14 near a snout zinc bath surface. 16. A continuous annealing device comprising the monitoring device according to claim 14 near the top of a heating zone furnace. 17. The method according to claim 1, which is provided in a polluted environment space.
The detection device in a polluted environment provided with the detector in the said 1st space of the clean space formation apparatus in any one of. 18. The detection device according to claim 17, wherein the detector is one of a television camera, a radiation thermometer, a photo sensor, and an ultrasonic sensor.