JP5232198B2 - Gas supply device that intermittently supplies gas into the liquid - Google Patents

Description

  The invention is a gas supply device for intermittently supplying a gas into a liquid according to the superordinate concept part of claims 1 and 6, wherein the gas supply device is arranged in the axial direction for the longitudinal distribution of the gas to be introduced. A perforated region with a perforation slit for introducing gas into the liquid, and at least one region that is not perforated. The present invention relates to a gas supply device for intermittently supplying gas into a liquid, comprising a diaphragm made of an elastic material.

  The gas supply device described in the high-order concept part of claims 1 and 6 is already known in EP1129768B1 and is the starting point of the present invention.

  Known gas supply devices have a tubular introducer with a lower groove extending axially for the longitudinal distribution of the gas to be introduced. The introducer is surrounded by a diaphragm made of an elastic material. The diaphragm has a perforated region with a perforation slit for introducing gas into the liquid. Further, the diaphragm has a non-perforated region in the lower part where the axial groove of the introduction body is provided. The purpose of not providing perforation in the axial groove region is to prevent direct outflow of gas supplied over the groove through the covering diaphragm in the groove region. Rather, an overpressure that lifts the diaphragm from the introducer while forming an annular chamber for annular gas distribution, thereby allowing gas to reach the perforation slit and thus outflow through a relatively large surface. Want to form.

  Generally, a gas supply device is used in a purification facility to supply gas to sewage. The gas supply device is operated continuously rather than continuously. The reason for intermittent gas introduction is the treatment concept in the purification plant for certain types of sewage. The treatment concept takes advantage of the action of bacteria, especially aerobic bacteria, to break down organic substances, that is, to transfer organic substances to low molecular weight compounds, ultimately carbon dioxide, water, nitrates and sulfates. Is based on that. A prerequisite for that in a system that works aerobic bacteria is sufficient aeration of the activated sludge in the sewage. The aeration is then interrupted and the importance of biological sewage purification by anaerobic bacteria, ie bacteria that are exploited and reductively degraded by chemically bound oxygen increases.

  In practice, due to intermittent operation, no gas is introduced into the liquid or sewage, and the diaphragm no longer swells between the inner surface of the diaphragm and the outer surface of the introducer due to the gas cushion, and During rest, when there is no longer an annular chamber in between, diaphragm wrinkling occurs in the upper region.

  When the gas supply device is shut off, i.e. when no gas is introduced into the liquid, a static pressure of the liquid is provided so that the diaphragm is pressed against the inlet. Since this does not always occur evenly, uncontrolled diaphragm formation of the diaphragm is particularly advantageously effected in the region of the perforation slit. This region is therefore slightly less rigid than the unperforated region of the diaphragm.

  The wrinkle formation is also promoted by the fact that the diaphragm has an expansion margin compared to the outer periphery of the introducer, that is, the diaphragm is larger than the outer periphery of the introducer in the relaxed state. Since the diaphragm can be easily pushed and moved on the introduction body without resistance, the assembly of the gas supply device is simplified due to the expansion of the diaphragm.

  The diaphragm has a so-called “extra material” that inevitably leads to wrinkle formation due to the expansion allowance. When the gas supply device is shut off, excess material is accommodated by wrinkles.

  Diaphragm wrinkle formation can be viewed as a fundamental drawback because the wrinkles cause the diaphragm material to bend and create internal stresses in the diaphragm material. As a result, the material becomes brittle at the wrinkles. This leads to the diaphragm tearing or breaking at the wrinkle after a long period of operation due to repeated on / off of the gas supply switch. The gas supply unit is no longer usable, and it is necessary to remove the gas supply unit from the liquid and replace the damaged diaphragm with a new diaphragm.

  In known gas supply systems, the lifetime of the diaphragm is extended by reducing the tendency to crack by forcing controlled wrinkling in the area of the diaphragm that is hardly weakened by the absence of perforation slits. For this purpose, in the known gas supply device, the following means are provided in the region facing the groove extending in the axial direction, that is, wrinkles of the diaphragm when the gas supply is interrupted, in the axial direction. Means is provided for forcing the region that is opposed to the groove extending to the region where no perforation slit is provided.

  Certainly, the gas supply device constructed in this way was able to achieve a substantial extension of the life of the diaphragm, but basically the diaphragm is also made of material at the wrinkle site by controlled wrinkling. It is inevitable that it will tear after a relatively long time due to the weakening of. As a result, each repeated wrinkle formation leads to crack formation and weakening of the material.

EP1129768B1

  An object of the present invention is to provide a gas supply device that can effectively release the diaphragm of the gas supply device from cracking tendency and weakening in spite of intermittent operation, and can clearly extend the operation period of the gas supply device. Is to provide.

  In order to achieve the above object, a gas supply apparatus according to the present invention is a gas supply apparatus for intermittently supplying gas into a liquid, and is arranged in an axial direction for longitudinal distribution of the gas to be introduced. Having at least one tubular introducer with a lower groove extending and having a perforated region with a perforation slit for introducing gas into the liquid and at least one region not perforated In the gas supply device for intermittently supplying gas into the liquid, comprising a diaphragm made of an elastic material, the groove is formed as a concave depression having no angular edge, On the surface of the introduction body, the outer circumference of the introduction body is different from the circular shape, and the outer circumference of the introduction body is the same as the inner circumference of the diaphragm. Device to increase is provided in so that, the full inner periphery of the diaphragm when the gas supply is cut off so that the can be completely in contact with the introducer.

  Preferably, the means are formed by providing at least one convex protrusion and / or at least one concave depression on the surface of the introducer.

  Preferably, the convex protrusion is provided in a portion on the upper side of the introduction body on the diameter with respect to the groove, and extends in the axial direction.

  Preferably, the concave depression is provided in the upper part of the introduction body on the diameter with respect to the groove, and extends in the axial direction.

  Preferably, the diaphragm has a non-perforated region where the convex protrusion or concave depression is provided.

  In order to achieve the above object, a gas supply apparatus according to the present invention is a gas supply apparatus for intermittently supplying gas into a liquid, and is axially distributed in the longitudinal direction of the gas to be introduced. A perforated region with a perforation slit for introducing gas into the liquid and at least one region that is not perforated. In a gas supply device for supplying gas into a liquid intermittently having a diaphragm made of an elastic material, the outer periphery of the introduction body is made different from a circular shape on the surface of the introduction body, and introduced. Means are provided for enlarging the outer periphery of the introduction body so that the outer periphery of the body has the same size as the inner periphery of the diaphragm when the outer periphery of the body does not have a groove.

  Preferably, the means is formed by a convex protrusion, and the convex protrusion is provided facing the lower groove in the upper portion of the introduction body and extends in the axial direction. ing.

  Preferably, the means is formed by the concave depression, and the concave depression is provided in the upper part of the introduction body so as to face the lower groove and extends in the axial direction. Yes.

  In the first aspect of the present invention, the groove extending in the axial direction is configured as a concave depression so as not to have an acute angled edge. Furthermore, on the surface of the introduction body, there is provided means for making the outer periphery of the introduction body different from the circular shape, and thereby expanding the outer circumference of the introduction body. Is the same size as the inner circumference of the diaphragm, and the diaphragm can come into full contact with the introducer by the entire inner circumference of the diaphragm when the gas supply is shut off.

  The invention newly achieves that the diaphragm no longer forms wrinkles when the gas supply device is shut off or when the gas supply is interrupted. Since the outer circumference of the introducer coincides with the inner circumference of the diaphragm, the entire diaphragm, including excess material, can make full contact with the introducer based on static pressure, especially in the region of the groove, Wrinkles are not brought. This avoids inconvenient crack formation or weakening of the diaphragm. This decisively extends the useful life of the diaphragm and thus the gas supply device.

  According to an advantageous configuration of the invention, the means for enlarging the outer periphery of the introducer is formed by providing at least one convex protrusion and / or at least one concave depression on the surface of the introducer. Has been.

  Under the action of static pressure, the extra material of the diaphragm gains enough space in the convex protrusions and / or concave depressions to contact the surface of the introducer without wrinkling. Further, in the present invention, since the groove is formed not to have an acute angled edge but to have a concave shape, the diaphragm is completely in contact with the introduction body even in the groove region. Wrinkles will not occur. Eventually, the excess material of the diaphragm is completely accommodated by the grooves and convex protrusions and / or concave depressions when the gas supply is shut off, and the diaphragm is not wrinkled on the surface of the diaphragm at all points of the introducer. Contact.

  According to an advantageous configuration of the invention, the convex protrusions are arranged on the diameter relative to the grooves in the upper part of the introducer and extend in the axial direction.

  The idea that the static pressure is slightly higher in the lower region of the introducer after the gas supply is cut off than in the upper region is the basis of the arrangement of the convex protrusions on the upper side of the introducer. Thus, after shutting off the gas supply, the diaphragm first contacts the introducer on the lower side and then gradually contacts further upward. Since the diaphragm hits just a convex protrusion in the upper region, a reliable and uniform contact of the diaphragm in the introducer is provided without any wrinkling. Since the lower axial groove is constructed based on the form of a concave depression, the diaphragm first contacts the surface of the groove and then contacts the convex protrusion.

  Another advantageous configuration of the invention is such that a concave depression is provided on the diameter of the groove in the upper part of the introducer and extends in the axial direction. The above considerations are similarly the basis of this arrangement.

  According to yet another advantageous configuration of the invention, the diaphragm has an unperforated region where a convex protrusion or a concave depression is provided.

  In the present invention, the diaphragm is completely wrinkled after the gas supply is shut off, so that the diaphragm (except for the lower axial groove region) is completely perforated and a perforation slit is provided in the diaphragm. There is a possibility. Thereby, the supply of gas into the liquid can be enhanced.

  Further, the object of the present invention is that, according to claim 6, when the outer periphery of the introducer is made different from a circular shape on the surface of the introducer and the outer periphery of the introducer has no groove, This is achieved by providing means for enlarging the outer periphery of the introducer so as to be the same size as the inner periphery.

  This solution has the advantage that the known, sharp edges and corners extending in the axial direction can be kept unchanged. In other words, when the gas supply is shut off, the diaphragm is not pressed into the groove in spite of static pressure, and the circular shape of the diaphragm is maintained even in the groove region. Is maintained as if it further extends circularly at the groove.

  When the outer circumference of the introduction body provided in the present invention has no groove on the outer periphery of the introduction body, the means for expanding the outer circumference of the introduction body to the same size as the inner circumference of the diaphragm, When the supply is shut off, there is no diaphragm extra material so the diaphragm is not pushed into the groove.

  As in the first solution, in the advantageous refinement of the invention, the already-described means are formed by convex protrusions. The convex protrusion is provided in the upper part of the introduction body relative to the lower groove, and extends in the axial direction.

It is a cross-sectional view of a gas supply device for intermittent supply of gas according to the first embodiment of the present invention when gas is supplied. FIG. 2 is a cross-sectional view of FIG. 1 in which gas supply is interrupted. It is a cross-sectional view of a gas supply device for intermittent supply of gas according to a second embodiment of the present invention when gas is supplied. It is a cross-sectional view of FIG. 3 with which gas supply is interrupted | blocked. It is a cross-sectional view of a gas supply device for intermittent supply of gas according to still another embodiment of the present invention when gas is supplied. It is a cross-sectional view of FIG. 5 with which gas supply is interrupted | blocked.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a gas supply device 10 including an introduction body 12 and a diaphragm 16 surrounding the introduction body 12. Diaphragm 16 has laterally perforated areas 18 and 20 with perforation slits 22 and other areas 24 that are not perforated and do not have perforation slits 22.

  The lower region 24 covers the groove 14 extending in the axial direction in the introduction body 12. The groove 14 serves for the longitudinal distribution of the gas to be introduced. The reason there is no perforation in the lower region 24 is that the covering diaphragm 16 prevents direct outflow of gas supplied through the groove 14 in the lower region of the groove 14. Rather, in order to allow outflow of gas through the relatively large surface of the diaphragm 16, the diaphragm 16 is lifted from the introducer 12 while forming an annular chamber for annular gas distribution, thereby providing a full perforation slit 22. I want to create an overpressure that allows the gas to reach

  As shown in FIG. 1, the groove 14 is configured not to have an acute angled edge. Rather, the groove 14 is a kind of concave depression on the surface 26 of the introducer 12 with roundness.

  A convex protrusion 28 is provided on the upper side of the surface 26 of the introduction body 12 so as to face the lower groove 14. As a result, the outer periphery of the introduction body 12 differs from the circular shape at this point. Considering the grooves 14 formed as the convex protrusions 28 and the concave depressions 14, the outer periphery of the introduction body 12 is enlarged compared to a normal circular shape. The so-called developed circumferential length of the introducer 12 different from the circular shape is exactly the same as the inner circumference of the diaphragm 16.

  The operation of the convex protrusion 28 and the concave groove 14 can be seen from FIG. FIG. 2 shows the gas supply device 10 when the gas supply is shut off. The diaphragm 16 is pressed against the introduction body 12 based on the static pressure of a liquid (not shown) surrounding the gas supply device 10. The outer circumference of the introduction body 12 is intended to be the same size as the inner circumference of the diaphragm 16 due to the convex protrusion 28 on the outer periphery and the outer circumference or the developed circumferential length of the introduction body in consideration of the concave depression 14. Since the diaphragm 16 is enlarged, the diaphragm 16 is completely in contact with the introduction body 12 so that wrinkles are not formed in all regions and wrinkles are not formed. When the diaphragm 16 is in contact with the introduction body 12, the perforation slit 22 is closed.

  The "extra material" of the diaphragm mentioned at the beginning is advantageously accommodated by the concave groove 14 and the convex protrusion 28, unlike known gas supply devices in which the extra material is accommodated by wrinkles. . In the present invention, the diaphragm 16 no longer forms wrinkles all around the diaphragm 16 so that the material of the diaphragm does not refract anywhere. Thereby, the lifetime of the diaphragm 16 is decisively extended.

  In the embodiment shown in FIG. 3, the means for enlarging the outer periphery of the introduction body 12 is formed by a concave depression 30. The concave recess 30 is provided on the upper side of the introduction body 12 with respect to the lower concave groove 14. When the perforation slit 22 is closed, the circumferential length of the introduction body 12 due to the concave depression 30 is expanded to the same size as the inner circumference of the diaphragm 16. Therefore, according to the description of FIG. 4, when the gas supply is cut off, the diaphragm 16 completely contacts the introduction body 12 without forming wrinkles.

  In another embodiment of the invention as shown in FIG. 5, the groove 14 is configured as a well-known introducer, with an angular edge, not as a concave depression. A convex protrusion 32 is provided in a region above the introduction body with respect to the groove 14. Due to the convex protrusion 32, the outer periphery of the introduction body 12 is displaced from the circular shape at this point, and the outer periphery of the introduction body is enlarged. In this enlargement, the perforation slit is closed on the assumption that the outer periphery of the introduction body 12 does not have the groove 14 and that the introduction body 12 in the region of the groove 14 maintains a circular shape. This is done in the dimension of the same size as the inner periphery of the diaphragm.

  FIG. 6 shows the gas supply device 10 when the gas supply is shut off. As can be seen, the diaphragm 16 is in contact with the introducer 12 without wrinkles, particularly in the region of the lower region 14. If the gas supply is interrupted, the diaphragm 16 will not be pushed into the groove 14 because the diaphragm 16 does not have excess material.

  According to the embodiment described in FIGS. 3 and 4, a concave recess can be provided instead of the convex protrusion 32 in FIGS.

  Unlike known gas supply devices, in the present invention, all measures are limited to the configuration and configuration of the introducer 12. There is no need to change the diaphragm 16.

  10 Gas supply device, 12 Introducer, 14 Groove, 16 Diaphragm, 18 area (perforated), 20 area (perforated), 22 perforation slit, 24 area (not perforated), 26 surface, 28 Convex protrusion, 30 concave depression, 32 convex protrusion

Claims (5)

A gas supply device (10) for intermittently supplying gas into a liquid, comprising at least a lower groove (14) extending axially for the longitudinal distribution of the gas to be introduced Perforated areas (18, 20) with one tubular introducer (12) and with perforation slits (22) for introducing gas into the liquid and at least one unperforated area (24 A gas supply device for intermittently supplying gas into the liquid, comprising a diaphragm (16) made of an elastic material,
The groove (14) is formed as a concave depression having no angular edge, and the outer surface of the introduction body (12) is made different from the circular shape on the surface (26) of the introduction body (12). In addition, the circumferential length of the introduced body (12), which is different from the circular shape, is the same size as the inner circumference of the diaphragm (16) when the gas supply is shut off . Protruding portions (28) or depressions (30) that expand the outer periphery are provided, and when the gas supply is shut off, the entire inner periphery of the diaphragm (16) may be in complete contact with the introducer (12). A gas supply device for intermittently supplying a gas into a liquid, characterized in that the gas can be supplied.   The protrusion (28) and the depression (30) are respectively formed on the surface (26) of the introduction body (12) as at least one convex protrusion (28) and at least one concave depression (30). The gas supply device according to claim 1, wherein the gas supply device is formed.   The convex protrusion (28) is provided in the upper part of the introduction body (12) on the diameter with respect to the groove (14) and extends in the axial direction. The gas supply device according to claim 2.   The concave depression (30) is provided in the upper part of the introduction body (12) on the diameter with respect to the groove (14) and extends in the axial direction. Item 3. The gas supply device according to Item 2.   The diaphragm (16) is characterized in that it has a non-perforated region (24) where the convex protrusion (28) or the concave depression (30) is provided. 2. The gas supply device according to 2.

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