JP2005095877A - Fine bubble generator and water mixer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make fine bubbles containing air, oxygen or ozone acting efficiently on water to be treated with regard to a fine bubble generator and a water mixer. <P>SOLUTION: A pressurizing pump 18, a water mixer 20 and a pressure regulation valve 22 are arranged at water charging piping to a storage tank for water to be treated. Ozone gas from an ozone generator 24 is introduced into an injection water pipe 12 and is dissipated as fine bubbles to water to be treated from the pressure regulation valve 22 via the water mixer 20 after pressurizing with the pressurizing pump 18. The pressure regulation valve 22 is connected to an electric motor 26, and when it detects that the flow rate is insufficient (clogging with foreign matters) by a flowmeter 16, the pressure regulation valve 22 is totally opened by the electric motor 26. A part of the injection water pipe 12 from the pressure regulation valve 22 and the electric motor 26 and from a water surface to the pressure regulation valve 22 is covered liquid-tightly with a case 40. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fine bubble generating device and a water flow mixer, and is for causing fine bubbles containing air, oxygen or ozone to act on treated water, reducing sewage sludge, disinfection of sewage treated water, and combined sewerage. It is particularly suitable for sterilization of Escherichia coli in rainy weather overflowing water (CSO) and Cryptosporidium in water purification plants.

  Water treatment using air, oxygen, or ozone, particularly bubbles containing ozone, is used in aeration tanks and pressurized levitation devices in sewage, sterilization in water purification plants, and the like. In this case, the finer the bubble, the smaller the diameter, the lower the flying speed. Therefore, the finer the bubble, the better the efficiency of water treatment. Conventional microbubble generators include those using a pressure regulating valve and those using a water flow mixer.

  In those using a pressure regulating valve (see Patent Document 1), a pressure regulating valve is provided on the downstream side of the pressurizing pump, and the flow path is normally throttled by the pressure regulating valve. It has become. For this reason, the pressure drops sharply when passing through the pressure regulating valve, so that the solubility is lowered and the excess is separated as bubbles containing ozone, and decomposes by contacting with bacteria such as Escherichia coli in the treated water while the bubbles are rising. Let me. In the pressure levitation method, the larger the pressure drop (the larger the flow velocity), the larger the amount of bubbles that can be obtained, but the pressure drop is about 0.4 to 0.5 MPa for normal sewage treatment.

  An apparatus using a water flow mixer is disclosed in Patent Document 2 and the like, and in this type of water flow mixer, a plurality of baffle plates are provided at intervals in the longitudinal direction in a flow path through which injected water passes, By narrowing the flow path, a pressure drop is caused to increase the flow velocity, and the baffle plate causes flow disturbance to generate fine bubbles. Even if a water flow mixer is used instead of the pressure control valve in the pressurized flotation device, the required amount of fine bubbles remains unchanged, so the water flow mixer also has a pressure of 0.4 to 0.5 MPa (4 as the flow rate). It is necessary to design the water flow mixer so that a pressure drop of ˜7 m / s) occurs.

Japanese Patent Laid-Open No. 7-171585 Japanese Patent No. 2923402

  In a fine bubble generator using a conventional pressure regulating valve, air, oxygen or ozone is dissolved in the injected water under pressure, and the excess dissolved portion due to the pressure drop after passing through the pressure regulating valve is treated as fine bubbles in the treatment tank. It is generated. Undissolved air or oxygen or ozone on the upstream side of the pressure regulating valve becomes coarse bubbles and passes through the pressure regulating valve as it is, so that the undissolved air, oxygen or ozone is released upstream of the pressure regulating valve. Therefore, it is necessary to provide a means for this, and as a result, the equipment cost increases. In particular, when ozone is used, expensive equipment for waste ozone treatment is essential for air pollution countermeasures.

  In addition, in the fine bubble generating device, in order to increase the floating distance of the fine bubbles, it is necessary to open the injection pipe for the injection water into the treatment tank at a deep portion thereof. On the other hand, since the pressure regulating valve is provided in the injection water piping, opening the pressure regulating valve directly into the water to be treated is to install the pressure regulating valve on the side wall when standing upright from the ground like a pressurized flotation tank It is not a big problem because it is easy to design, but it is difficult if it is buried underground in an aeration tank. That is, in the case of the aeration tank, the structure is such that the injection water piping from the pressure regulating valve installed on the ground is guided to the vicinity of the bottom surface in the aeration tank. In this case, the part from the pressure regulating valve to the opening end of the injection water pipe becomes long. As the injected water passes through the pressure regulating valve, the pressure immediately drops, so the surplus gas that could not be dissolved becomes bubbles, and this bubble is the longest part of the injected water piping from the pressure regulating valve until it is diffused into the water to be treated There is a possibility that the bubbles come into contact with each other and become coarse while passing through the long portion of the narrow injection water pipe, and the desired effect cannot be obtained.

  On the other hand, in a processing apparatus using a water flow mixer, even if there are bubbles of undissolved air or oxygen or ozone, they are crushed in the water flow mixer, so that they are not introduced into the treatment tank as coarse bubbles. . In other words, unlike the method using a pressure control valve, there is no need for excess air or oxygen or ozone discharge equipment, and the apparent amount of ozone dissolved in the injected water can be increased, generating more fine bubbles. It can be shown. However, even in the case of a water flow mixer, in order to obtain a desired amount of fine bubbles, it is necessary to generate a pressure drop of 0.4 to 0.5 MPa (the flow rate is 4 to 7 m / s) as in the case of the pressure regulating valve. . The flow path diameter that causes such a pressure drop is too narrow in the case of sewage that always contains foreign matter, and the problem of blockage by foreign matter is inevitable. In other words, in the case of a pressure regulating valve, when the blockage due to foreign matter occurs, the pressure regulating valve is forcibly fully opened to temporarily increase the flow path diameter, thereby eliminating the blockage state due to the foreign matter. Countermeasures are easy, but in the case of a water flow mixer, since the flow path diameter is fixed, once clogging with foreign matter occurs, it is necessary to stop and dismantle the equipment, so it is practically used for sewage treatment. It was impossible.

  Further, even if the structure of the water mixer itself is seen, in the structure of Patent Document 2, the baffle plates are alternately arranged 180 degrees symmetrically in the longitudinal direction, and the baffle plate has a convex shape with the front end of the baffle plate as the center. For this reason, when sewage is treated, there is a problem that foreign matters such as hair contained in the sewage are easily entangled with the baffle plate.

  The present invention has been made to solve the above problems. In addition, the present invention suppresses costs and efficiently generates fine bubbles regardless of the installation mode of the water tank to be treated, and makes it difficult for clogging due to foreign matters contained in the sewage, particularly entanglement of hair and the like. For the purpose.

  According to invention of Claim 1, the injection water piping opened to the to-be-processed part in a water treatment system, the oxygen-containing gas introduction means which introduce | transduces oxygen-containing gas in the water flow in an injection water piping, The said injection | pouring A pressure pump installed in the water pipe for pressurizing the water flow introduced with the oxygen-containing gas, a water flow mixer disposed in the injection water pipe, a pressure regulating valve located in the injection water pipe, and a pressure There is provided a microbubble generator characterized by comprising driving means for driving the regulating valve to open.

  Here, the oxygen-containing gas refers to a gas containing oxygen, such as air or oxygen or ozone.

  According to a second aspect of the present invention, in the first aspect of the present invention, the value of the pressure drop at the pressure regulating valve is larger than the value of the pressure drop in the water flow mixer. Is provided.

  According to a third aspect of the present invention, in the first aspect of the present invention, the driving means is installed in an electric driving means for opening and closing the pressure regulating valve, and an injection water pipe upstream of the pressure regulating valve. And detecting means for detecting whether or not the injection water pipe is blocked, and controlling the electric drive means to open the pressure adjusting valve to eliminate the blockage when the detection means detects that the injection water pipe is blocked. There is provided a fine bubble generating device characterized by comprising control means for controlling.

  According to a fourth aspect of the invention, in the third aspect of the invention, the electric drive means is disposed below the surface of the water to be treated in the treated portion, and the electric drive means and the pressure regulating valve. And a casing for fluidly accommodating the pipe to the pressure regulating valve, and the casing is provided with a fine bubble generator characterized in that the upper end extends beyond the water surface.

  According to a fifth aspect of the present invention, in the third aspect of the present invention, the apparatus according to the third aspect further comprises failure determination means for determining a failure when the closed state is not resolved regardless of the opening of the pressure regulating valve by the control means. A fine bubble generating device is provided.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the failure determination means performs a predetermined number of times of opening the pressure regulating valve and closes regardless of the predetermined number of times of opening of the pressure regulating valve. There is provided a fine bubble generating device characterized in that a failure is determined when the state cannot be resolved.

  According to the seventh aspect of the present invention, in the first aspect of the present invention, the discharge port of the pressure regulating valve is arranged to open substantially directly to the portion to be treated in the water treatment system. A fine bubble generating device is provided. Here, “substantially directly” means a state in which the discharge port of the pressure regulating valve is opened to the processing target as it is or with an extremely short pipe (maximum 1.5 m).

  According to an eighth aspect of the present invention, in the first aspect of the present invention, the water flow mixer includes a cylindrical main body through which a water flow into which an oxygen-containing gas has been introduced, and each is fixed to the cylindrical main body side. Microbubble generation characterized by comprising a plurality of baffle plates extending substantially in the radial direction to the middle of the flow path of the injected water and arranged at intervals along the longitudinal direction of the cylindrical body An apparatus is provided.

  According to the invention described in claim 9, in the invention described in claim 8, the free edge of the baffle plate is linear or has a shape recessed toward the center of the flow path. A microbubble generator is provided.

  According to invention of Claim 10, an oxygen-containing gas is introduce | transduced in the water flow in the to-be-processed water storage tank, the injection water piping connected near the bottom part of the said to-be-processed water storage tank, and the injection water piping. An oxygen-containing gas introduction means, a pressure pump that is installed in the injection water pipe and pressurizes the water flow into which the oxygen-containing gas has been introduced, and is positioned downstream of the pressure pump to normally restrict the water flow to the injection water pipe. A pressure regulating valve and a drive means for driving the pressure regulating valve to be opened when necessary, and the flow of the squeezed injected water from the pressure regulating valve is substantially directly in the treated water storage tank. There is provided a microbubble generator characterized in that it is disposed so as to be discharged into the air.

  According to invention of Claim 11, an oxygen-containing gas is introduce | transduced in the water flow in the to-be-processed water storage tank, the injection water piping connected near the bottom part of the said to-be-processed water storage tank, and the injection water piping. An oxygen-containing gas introduction means, a pressure pump that is installed in the injection water pipe and pressurizes the water flow into which the oxygen-containing gas has been introduced, and is positioned downstream of the pressure pump to normally restrict the water flow to the injection water pipe. And a driving means for driving the pressure regulating valve to open when necessary, the pressure regulating valve being located at a predetermined depth from the water surface of the treated water storage tank. A microbubble generator is provided.

  According to the invention described in claim 12, in the invention described in claim 11, the driving means for driving the pressure regulating valve is configured to be electrically operated, and the pressure regulating valve and the electric driving means accommodate treated water. There is provided a microbubble generator characterized in that it includes a casing that is positioned so as to be immersed in the water to be treated in a tank and that tightly surrounds at least the pressure regulating valve and the electric drive means.

  According to a thirteenth aspect of the present invention, in the twelfth aspect of the present invention, the injection water pipe extends from above the water surface in the treated water storage tank to the pressure regulating valve, and the casing includes the pressure regulating valve and In addition to the electric drive means, there is provided a fine bubble generator characterized in that it surrounds the liquid surface in the injection water pipe and a portion extending from slightly above to the pressure regulating valve.

  According to the invention described in claim 14, in the invention described in any one of claims 1 to 13, there is provided a microbubble generator characterized in that the oxygen-containing gas contains ozone. The

  According to invention of Claim 15, it is a water flow mixer used in the injection water piping opened to the to-be-processed part in a water treatment system, and disturbs the pressurized flowing water, Comprising: Pressurized flowing water And a plurality of baffle plates arranged at intervals along the longitudinal direction of the cylindrical main body, each baffle plate extending substantially radially from the fixing portion on the cylindrical main body side. The free end extends to the middle of the flow path and extends over substantially the entire width of the flow path, and the free edge of each baffle plate is linear in its entire length or is recessed toward the center of the flow path A water flow mixer is provided.

  According to the invention of claim 16, in the invention of claim 15, each of the plurality of baffle plates is directed toward the downstream side in the flow direction on the front surface in the flow direction of the pressurized flowing water in the cylindrical main body. A water flow mixer is provided which is characterized by some inclination.

  According to a seventeenth aspect of the present invention, in the invention according to the fifteenth or sixteenth aspect, the baffle plate has a plurality of grooves formed on the front surface or the rear surface in the flow direction of the pressurized flowing water. A vessel is provided.

  According to the invention described in claim 18, in the invention described in any one of claims 15 to 17, each baffle plate is fixed to a cylindrical member inserted into the cylindrical main body and is adjacent to the longitudinal direction. The tubular body is provided with an end abutting structure in the tubular body, and a water flow mixer is provided.

  According to the invention described in claim 19, in the invention described in claim 18, one of the opposing end faces of the adjacent cylindrical members is provided with a protrusion, and the other is provided with a groove spaced in the circumferential direction. Are provided that are interdigitated.

  According to the invention of claim 20, an injection water pipe that is opened in a portion to be treated in a water treatment system, an oxygen-containing gas introduction means that introduces an oxygen-containing gas into a water flow in the injection water pipe, and the injection A pressurization pump that is installed in the water pipe and pressurizes the water flow into which the oxygen-containing gas is introduced, and is disposed downstream of the pressurization pump, along the longitudinal direction of the cylindrical main body through which the pressurized flow water passes. There is provided a water flow mixer comprising a plurality of baffle plates arranged at intervals, wherein the water flow mixer is substantially directly open to the treated portion. The

  According to the invention described in claim 21, in the invention described in claims 15-20, the cylindrical main body is composed of a plurality of cylindrical members connected in series in the longitudinal direction, and the most upstream and the most downstream cylindrical members. There is provided a fine bubble generating device characterized in that

  The operation and effect of the invention of claim 1 will be described. The oxygen-containing gas is introduced into the water flow in the injection water pipe and pressurized by a pressure pump. If the amount of gas injection exceeds the solubility determined by the pressure of the injected water, excess gas will be introduced into the treated part in the form of coarse bubbles, but the coarse bubbles can be finely crushed by installing a water flow mixer. it can. Then, the water flow containing fine bubbles passes through the pressure regulating valve and receives a second-stage pressure drop, and fine bubbles are generated by the excessive dissolution at that time, and are diffused to the processing target portion. In this invention, by using the water flow mixer and the pressure regulating valve in combination, the excess gas is made into fine bubbles by the disturbance effect of the water flow mixer, so that the amount of fine bubbles can be increased and the excess gas can be discharged. Costly equipment (exhaust ozone treatment equipment when ozone is used) is not necessary, and the water flow mixer can be used with a low pressure drop. Can be eliminated.

  The operation and effect of the invention of claim 2 will be explained. By increasing the pressure drop applied by the pressure regulating valve compared to the pressure drop applied to the water flow in the water flow mixer, it is caused by the foreign matter on the water flow mixer side. The risk of blockage can be reduced as much as possible, and blockage caused by foreign matter in the pressure regulating valve can be easily dealt with by opening the pressure regulating valve.

  The operation / effect of the invention of claim 3 will be described. The presence or absence of a blockage state of the injection water pipe is detected, and when the blockage is present, the pressure adjustment valve can be opened by the electric drive means. Since the passage resistance is reduced, the blocked foreign matter can be circulated and the blocked state can be automatically resolved.

  The operation and effect of the invention of claim 4 will be described. The pressure adjusting valve, the electric drive means, and the injection water piping to the pressure adjusting valve are flow-tightly accommodated in the casing, and the casing extends beyond the water surface. . Therefore, the pressure regulating valve and the electric drive means accommodated in the housing can be installed in the processing target in a so-called throwing type, and even if the processing target is installed in the ground like an aeration tank, It becomes possible to install simply and at low cost.

  The operation and effect of the invention of claim 5 will be described. By detecting that the closed state is not resolved regardless of the opening of the pressure regulating valve, the closed state can be detected quickly and necessary action can be promoted.

  The operation and effect of the invention of claim 6 will be explained. By repeating the opening operation of the pressure regulating valve a predetermined number of times and nevertheless the closed state is not resolved, it is determined that a failure has occurred, so that the temporary blockage is detected from the detection target. Detachable and reliable judgment can be made.

  The operation and effect of the invention of claim 7 will be described. The outlet of the pressure regulating valve is opened to the processing target as it is or through a short pipe having a maximum length of 1.5 m. Therefore, the fine bubbles generated in the injected water due to the pressure drop when passing through the pressure regulating valve are substantially diffused as they are in the treated portion. Therefore, since the bubble does not become coarse, the ascending time can be made as long as possible to achieve the maximum effect.

  The action and effect of the invention of claim 8 will be described. By forming the water flow mixer from a plurality of baffle plates each extending in the radial direction and spaced in the longitudinal direction of the cylindrical main body, the number of baffle plates or By setting the length of each baffle plate in the radial direction optimally, it is possible to obtain a desired stirring effect while setting the desired passage resistance, and to prevent clogging while efficiently generating fine bubbles. And the treatment of sewage can be optimized.

  The action / effect of the invention of claim 9 will be described. By making the free edge of the baffle plate of the water flow mixer straight or recessed toward the center of the flow path, hair etc. often contained in sewage Entanglement becomes difficult to occur and can be adapted to the treatment of sewage.

  The operation and effect of the invention of claim 10 will be described. The oxygen-containing gas is introduced into the water flow in the injection water pipe and pressurized by a pressure pump. Since the water flow in which the oxygen-containing gas is injected is pressurized by the pressurizing pump, the solubility is increased and a large amount of gas can be dissolved. When the pressure regulating valve passes, the pressure of the injected water drops, so that the solubility decreases, and excess air, oxygen, or ozone corresponding to the differential pressure is generated as fine bubbles. Since the flow of the throttled injection water from the pressure regulating valve is dissipated substantially directly to the water tank to be treated, the bubbles remain in a fine state without coagulating and coarsening each other. The ascending speed becomes slow, and the effects such as sterilization by air bubbles and volume reduction of activated sludge can be utilized to the maximum.

  The operation and effect of the invention of claim 11 will be described. The oxygen-containing gas is introduced into the water flow in the injection water pipe and pressurized by the pressure pump. Since the water flow in which the oxygen-containing gas is injected is pressurized by the pressurizing pump, the solubility is increased and a large amount of gas can be dissolved. Since the pressure regulating valve is normally positioned so as to restrict the water flow, the pressure of the injected water drops when passing through the pressure regulating valve, so that the solubility decreases, and excess air, oxygen or ozone is generated as fine bubbles by the differential pressure. Is done. And since the said pressure regulation valve is located in the predetermined depth from the liquid level of a to-be-processed water storage tank, the flow of the injection water restrict | squeezed from a pressure control valve is substantially directly processed water storage tank Therefore, the bubbles remain in a fine state without coagulating and coarsening each other, so that the rising speed in the treated water storage tank becomes slow, and the bubble effect can be used to the maximum.

  The action and effect of the invention of claim 12 will be described. Since the pressure regulating valve is submerged in the treated water storage tank, the injected water is directly discharged from the pressure regulating valve into the treated water storage tank. The fine bubbles generated by the pressure drop are dissipated into the water to be treated without any coarsening, and the maximum effect of the bubbles can be obtained. However, since the pressure regulating valve and the electric drive means are surrounded in a fluid-tight manner by the casing, a stable operation can be expected without fear of failure due to leakage.

  The operation and effect of the invention of claim 13 will be explained. Since the pressure control valve, the electric drive means, and the portion up to the water surface of the pipe to the pressure control valve are surrounded by a casing, the pressure control valve In addition, the piping to the electric drive means and the pressure regulating valve can be conveniently used as a throw-in type assembly, and since it is dug from the ground, it can also be conveniently used in a water tank or a water channel having no side wall.

  The action and effect of the invention of claim 14 will be explained. Ozone is contained in the gas by containing ozone in the gas, and since the air bubbles are fine, the effect of sterilization by ozone is utilized to the maximum. be able to.

  The action and effect of the invention of claim 15 will be described. The water flow mixer is composed of a plurality of longitudinally spaced baffle plates each extending substantially in the radial direction to the middle of the flow path, and the free ends of the baffle plates are Since it is configured to be separated in the longitudinal direction, a predetermined stirring effect can be obtained by appropriately arranging the extension length and number of baffle plates in the radial direction, and the baffle plate has a free edge. Since the entire length is linear or concave toward the center of the flow path, no convex part is formed over the entire passage width, and foreign matters such as hair are hardly entangled, which is convenient for use in sewage treatment.

  The operation and effect of the invention of claim 16 will be described. A smooth flow of the water to be treated can be obtained by slightly inclining the front surface of the baffle plate toward the downstream side in the flow direction.

  The operation and effect of the invention of claim 17 will be described. By forming grooves on the front and rear surfaces of the baffle plate, disturbance can be caused and contribute to the generation of fine bubbles.

  The action and effect of the invention of claim 18 will be described. Each baffle plate can be formed into an assembly with a cylindrical member having a thickness larger than the thickness in the longitudinal direction of the baffle plate to which the baffle plate is fixed. By inserting it into the cylindrical main body, it is possible to easily obtain an arrangement in which a number of baffle plates are separated in the longitudinal direction.

  The operation and effect of the invention of claim 19 will be described. A pair of adjacent cylindrical members is provided with a circumferentially spaced groove on one opposing end surface, and a projection on the other, and the projection is arranged in a plurality of circumferential directions. By fitting in one groove in the direction groove, the relative angle between adjacent baffle plates can be easily changed according to the number of grooves installed, although it is a jumping angle, and assembly is facilitated. This makes it easy to adjust the baffle angle.

  The operation and effect of the invention of claim 20 will be explained. The oxygen-containing gas pressurized by the pressurizing pump is introduced into the water flow in the injection water pipe, pressurized by the pressurizing pump, and introduced into the water flow mixer. Is done. In the water flow mixer, stirring is carried out by passing through a number of baffle plates, and by setting a suitable number of baffle plates of appropriate height, a predetermined fine bubble diameter can be obtained, and the water flow mixer is covered. Since the processing portion is substantially directly opened, it is possible to avoid agglomeration and coarsening of the fine bubbles, and to perform effective sterilization / disinfection with the fine bubbles.

  The operation and effect of the invention of claim 21 will be described. Since the cylindrical member 260 is connected in series to form an assembly with bolts and nuts, the clogging and the like can be prevented by loosening the bolts and nuts. The decomposition can be easily performed, which is extremely advantageous for maintenance of the water flow mixer.

  FIG. 1 schematically shows an apparatus for generating fine bubbles according to an embodiment of the present invention. This embodiment is directed to application to a treated water storage tank 10 (treated portion in the present invention) in a sludge treatment system. It is a thing. Examples of the treated water storage tank 10 include an aeration tank and a pressurized levitation tank in sewage treatment, and the present invention can also be used for sterilization of Cryptosporidium in a water purification plant. Ozone-containing microbubbles are generated in the water tank 10 to be treated, and sludge is adhered to the microbubbles while the microbubbles are floating on the surface, and sterilization / disinfection is achieved by ozone contained in the bubbles. The gas (oxygen + ozone) is dissolved in the injected water, and when the injected water is discharged into the treated water storage tank 10, the pressure drops, and the solubility decreases accordingly. It can generate | occur | produce in the to-be-processed water accommodation tank 10 as a microbubble of a diameter of 10 micrometers. Reference numeral 12 denotes a pipe for injection water, and the upstream end is connected to an injection water tank 14 for collecting water from an appropriate water intake site in the sewage treatment system (for example, downstream of the final sedimentation basin in the case of sewage treatment). The downstream end is opened near the bottom of the treated water storage tank 10. A flow meter 16 (detecting means of the present invention), a pressurizing pump 18, a water flow mixer 20, and a pressure adjusting valve 22 are sequentially arranged in the injection water pipe 12 from the upstream side. An ozone generator 24 (oxygen-containing gas introducing means of the present invention) is disposed on the suction side of the pressure pump 18.

  The configuration of the present invention is different from that of an ordinary fine bubble generator of the pressure floating type in that it is adapted to sewage by using a water flow mixer 20 and a pressure regulating valve 22 in combination. In a microbubble generator using a water flow mixer, microbubbles are generated by pressure loss and disturbance. In other words, by passing through a water flow mixer at high speed, undissolved bubbles in the injected water can be crushed, and since it does not become coarse, there is an advantage that there is no need to discharge gaseous excess air, and apparent solubility The amount of fine bubbles generated in the water tank 10 to be treated can be increased, but the generation of fine bubbles at such a high pressure loss and high flow rate can block the water flow mixer if foreign matter is present. It was thought to be easy to use and not suitable for use in sewage containing a large amount of foreign matter. Therefore, in the present invention, the water flow mixer 20 does not have a high pressure loss, and is designed to have a low flow rate, so that the bubbles are insufficient in the water flow mixer while the water flow mixer is microbubbled without fear of clogging by foreign matter. Is replenished by generating bubbles with a high pressure loss and high flow rate pressure regulating valve so that efficient generation of fine bubbles can be achieved as a whole. For the problem of foreign matter blockage at the high pressure loss pressure regulating valve, the pressure regulating valve is an automatic valve, and when there is a foreign matter blockage, the pressure regulating valve is forcibly opened to remove the foreign matter. It is dealt with by encouraging distribution. That is, it is said that a pressure loss of about 0.5 MPa (≈ discharge pressure of the pressurizing pump 18) is required to obtain a desired amount of fine bubbles by the water flow mixer alone. Use a low pressure drop of about 0.1 MPa and share the remaining pressure loss of 0.4 MPa in the pressure regulating valve 22 to contradict demands for increasing the amount of fine bubbles and easy countermeasures against foreign matter blockage. Is addressed.

  In the ozone generator 24, air containing ozone at a predetermined ratio is introduced into the injection water pipe 12 upstream of the pressure pump 18. As the ozone generator 24, high-purity oxygen gas is obtained by repeating the pressurization and depressurization by PSA (Pressure Swing Adsorption) using an adsorbent such as zeolite for the raw material air, and the oxygen gas is a discharge type ozonizer. A system that generates ozone / oxygen mixed gas containing high-concentration ozone by generating ozone can be employed. The ozone / oxygen mixed gas under pressure is taken out from the ozone generator 24 and mixed into the injected water on the suction side of the pressure pump 18.

  The pressure regulating valve 22 is automatically driven by an electric motor 26 (electric drive means of the present invention) as shown in FIG. 1, and is configured as a ball valve as schematically shown in FIG. That is, the pressure regulating valve 22 includes a valve housing 28, a spherical valve body 30 that is rotatably accommodated in a spherical cavity inside the valve housing 28, and a rotary shaft 32 that is connected to the spherical valve body 30. The rotating shaft 32 is connected to the output shaft of the electric motor 26, and the electric motor 26 is controlled by a control circuit (control means of the present invention) having a microcomputer (not shown). The spherical valve body 30 is rotated within a predetermined angle range by the rotational movement of the output shaft of the electric motor 26, and the flow rate can be controlled. That is, the spherical valve body 30 forms a valve passage 34 extending in the radial direction, while the valve housing 28 is connected to the inlet 36 connected to the injection water pipe 12 side in FIG. And an open discharge port 38. The valve passage 34, the suction port 36, and the discharge port 38 have almost the same diameter, but in a normal state where no blockage due to foreign matter occurs, the valve passage 34 is located at the rotational position of the spherical valve body 30 as shown in FIG. Is squeezed. This state of the spherical valve body 30 is referred to as the throttle position of the pressure regulating valve 22, and FIG. 3 shows the positional relationship of the valve passage 34 with respect to the inlet and outlet ports 36, 38 at this throttle position of the pressure regulating valve 22 (III in FIG. 2). FIG. 3 shows that the valve passage 34 is throttled by the rotation of the spherical valve body 30. At the throttle position of the pressure regulating valve 22, the injected water undergoes a large pressure drop when passing through the pressure regulating valve 22, and fine bubbles can be generated in the treated water storage tank 10 as described above. When the blockage by the foreign matter occurs, the spherical valve body 30 is rotated counterclockwise as indicated by an arrow f from the position of FIG. 2, and the valve passage 34 is inhaled as shown by a two-dot chain line 34A. The discharge ports 36 and 38 can be aligned with each other (this state of the spherical valve body 30 is referred to as the open position of the pressure regulating valve 22). Since the valve passage 34 is not throttled in this open position, the foreign matter is forcibly discharged, the closed state is eliminated, the spherical valve body 30 is rotated in the direction opposite to the arrow f in FIG. 2, and the pressure regulating valve 22 is closed. It is possible to return to the original operation state in which the fine pressure bubbles are generated in the treated water storage tank 10 by causing the original pressure drop by the pressure adjusting valve 22 again to the position (throttle state).

  As shown in FIG. 1, in this embodiment, the pressure regulating valve 22 and the electric motor 26 for driving the pressure regulating valve 22 are installed in a so-called throwing type from above the liquid level W of the treated water storage tank 10. And the electric motor 26 for the drive is located so that it may be immersed in the to-be-processed water storage tank 10. FIG. The electric motor 26 is completely covered with the housing 40 including the pressure regulating valve 22 and the piping portion to the pressure regulating valve 22, so that the electric motor 26 and the electric motor are provided regardless of the throwing structure. The connection part from 26 to the pressure regulating valve 22 is waterproofed. Referring to FIGS. 4 and 5, this throw-in waterproof structure (the flow-tight structure of the present invention) will be described. A plurality of pipes 42, 42 ′, 42 ″ connected by flanges are connected to the water flow mixer 20 of FIG. It constitutes a part of the injection water pipe and is introduced from above the liquid level into the treated water storage tank 10. The inlet 36 of the pressure regulating valve 22 shown in Fig. 2 is the end of the lower pipe 42 '. The end of the pipe 42 ′ is slightly bent so as to loosen the angle with the bottom surface of the treated water storage tank 10, and the outlet 38 of the pressure regulating valve 22 is connected via the outlet horn 44. It opens to the water tank 10 to be treated, and the opening portion of the outlet horn 44 is a portion having a depth of D from the liquid surface. The flange is connected to the pipe. The housing 40 is connected to the lower end portion 40-6 from the upper end portion 40-1 via the upper transition portion 40-2, the intermediate portions 40-3 and 40-4, and the lower transition portion 40-5. -1, 40-2, 40-3, 40-4, 40-5, 40-6 are connected to each other by a series of flanges, and the cavity is sealed (sealed) inside. And the pipe 42, the pressure regulating valve 22 and the electric motor 26 can be accommodated in the cavity. In FIG. 4, the vertical column 46 has an upper end fixed to an overhanging portion 10-1 from the upper end of the side wall of the treated water storage tank 10, and a lower end of the vertical column 46 is located on the bottom surface 10-2 of the treated water storage tank 10. The casing 40 is fixed to the vertical column 46 by the bracket 50 at the lower transition portion 40-5 on the lower end side. Therefore, it is possible to ensure a stable posture of the casing 40 in the treated water storage tank 10 and the pressure regulating valve 22 and the electric motor 26 accommodated in the internal cavity regardless of the throwing structure. As shown in FIG. 4, the outlet horn 44 slightly protrudes into the treated water storage tank 10 via the lower end portion 40-6 of the housing 40. The distance from the spherical valve body 30 (FIG. 2) of the pressure regulating valve 22 to the opening end of the outlet horn 44 is short, and bubbles formed at the moment when the pressure regulating valve 22 flows out from the throttle portion of the flow path diameter are from this throttle portion. It is diffused directly to the treated water storage tank 10 substantially directly. For this reason, bubbles are prevented from agglomerating and coarsening that can occur when the pipe from the throttle part of the flow path diameter of the pressure regulating valve 22 to the treated water storage tank 10 is connected by a long pipe, and the treated water is accommodated in the form of fine bubbles. The inside of the tank 10 can be levitated.

  In this embodiment, the pressure regulating valve 22, the electric motor 26, and the piping portion of the pressure regulating valve 22 from the water surface have a throwing structure in which the casing is flow-tightly held, and this throwing structure is covered by an aeration tank, a pressurized floating tank, or the like. The example installed in the treated water storage tank 10 is demonstrated. However, the present invention is not limited to this, and the present invention can be applied to installing the throwing structure in a water channel and sterilizing with ozone gas. In the embodiment described above, the throwing structure is used in combination with the water mixer 20, but an arrangement without the water mixer 20 is also included in the present invention. In other words, the pressurized injected water from the pressurizing pump is directly introduced into the pressure regulating valve 22, and the fine bubbles are diffused into the treated water storage tank 10.

  In the present invention, as shown in FIG. 1, a water flow mixer 20 is provided in the injection water pipe 12 in addition to the pressure regulating valve 22, so that fine bubbles can be generated efficiently. That is, since the ozone / air mixed gas from the ozone generator is pressurized by the pressurizing pump 18, a large amount of gas can be dissolved as compared with that under atmospheric pressure. However, since the excess is not dissolved, it becomes coarse bubbles as it is. Therefore, it has been conventionally known that bubbles are crushed and made into fine bubbles under a high pressure loss and a high flow rate by a water flow mixer. However, since the conventional structure has a high pressure loss and a high flow velocity, the effective diameter has to be reduced in the case of a water flow mixer, and when used in the treatment of sewage, it cannot cope with the problem of obstruction caused by foreign matters. Therefore, in the present invention, the water flow mixer 20 is provided in addition to the pressure control valve 22, and the water flow mixer 20 has a structure capable of crushing bubbles with a low pressure drop and a low flow rate. By supplementing with 22, it is possible to cope with the blockage by the foreign matter although the generation efficiency of the fine bubbles is high. The structure of the water flow mixer will be described with reference to FIGS. 6 to 8. The water flow mixer 20 has a cylindrical main body 60 through which pressurized flowing water passes, and each extends from the inner peripheral surface of the cylindrical main body to the middle of the flow path. And a plurality of baffle plates 62 arranged at intervals along the longitudinal direction of the cylindrical main body. The end of the cylindrical main body 60 is provided with a flange 64, and is joined to flanges 66 'and 68' of the pipes 66 and 68 constituting the injection water pipe 12 of FIG. As shown in FIGS. 6 and 7, each baffle plate 62 constitutes a baffle plate assembly 72 by being welded and fixed to the inner peripheral surface of the corresponding cylindrical member 70. The cylindrical members 70 in the baffle plate assembly 72 are sequentially inserted into the cylindrical main body 60, whereby the plurality of baffle plates 62 can be arranged at intervals in the longitudinal direction. As shown in FIG. 9, the baffle plate 62 extends from the inner peripheral surface of the cylindrical member 70 to a free end edge 62 </ b> A that slightly exceeds the center line, and the distance L between the opposing surface of the cylindrical body 60 is this. The effective diameter of the cylindrical body. The free edge 62A extends linearly in this embodiment (see FIG. 10). As shown in FIG. 9, the front surface of the baffle plate 62 is inclined downstream in the flow direction of the injected water (arrow a), and a smooth flow of injected water in the cylindrical main body 60 can be obtained. Accumulation of foreign matter can be prevented. In addition, a large number of grooves 62-1 and 62-2 are formed on the front surface and the rear surface of the baffle plate 62, respectively, and the injected water collides with these grooves 62-1 and 62-2 so that the flow of the injected water is increased. Can be disturbed and contribute to the crushing of bubbles. In the embodiment of FIG. 6, the plurality of baffle plates 62 are arranged with their phases alternately turned 180 degrees in the adjacent longitudinal direction. However, the present invention is not necessarily limited to this arrangement, and any arrangement is possible. In this embodiment, each baffle plate 62 can take four types of angular positions of 0, 90, 180, and 270 degrees. That is, the cylindrical member 70 in the baffle plate assembly 72 has a positioning projection 73 (see also FIG. 12) having a triangular cross section as shown in FIG. The other end face has four cutouts 74 (see also FIG. 13) that are spaced 90 degrees apart from each other in the circumferential direction as shown in FIG. 11, and these positioning projections 73 and the cutouts 74 are mutually connected. The dimensions are such that they can be fitted substantially without play. Therefore, in the pair of baffle plate assemblies 72 adjacent to each other in the longitudinal direction, the end surface on which the projection 73 of one cylindrical member 70 is formed and the end surface on which the notch 74 is formed are opposed to each other, and the positioning projection 73 is formed on the opposing surface. By fitting an appropriate one of the four cutouts 74, the relative angular position of the pair of baffle plates 62 adjacent in the longitudinal direction is set to four relative angles of 0, 90, 180, and 270 degrees. Any relative angular position of the position can be taken. For example, FIG. 14 shows a water flow mixer 120 according to another embodiment, and a plurality of baffle plates 62 are arranged in the longitudinal direction of the cylindrical main body 60 at intervals in the same manner as in FIG. A plurality of baffle plates composed of two baffle plates 62 adjacent to each other are arranged at 180 ° symmetrical positions. Such a configuration can also be applied in the same manner, and a plurality of baffle plates can be arranged at arbitrary angular positions in the longitudinal direction in addition to FIGS. 6 and 14.

  The water flow mixer 20 perturbs the ozone-containing injected water from the pressure pump 18 and achieves the function of crushing the ozone-containing bubbles in the injected water. That is, injection water having a pressure of, for example, 0.5 MPa is obtained by the pressurizing pump 18 (FIG. 1), and at this time, the solubility is increased compared with the atmospheric pressure (0.0 MPa), so that a larger amount of ozone can be dissolved. it can. However, since there is an excess amount, the excess amount becomes an ozone-containing bubble. When the ozone-containing bubbles pass through the water flow mixer 20, the baffle plate 62 becomes a resistance, the flow is disturbed, and the bubbles can be crushed. In the case of a normal pressure flotation device using a water flow mixer, the water flow mixer is connected to a pressure flotation tank via a pipe, and in the case of generating an injection water of 0.5 MPa with a pressure pump, The pressure drop is 0.5 MPa. In this case, the flow path resistance of the baffle plate is increased to obtain a high pressure loss and a high flow velocity when passing through the baffle plate. However, in the conventional configuration in which the generation of fine bubbles is based only on the water flow mixer, the opening area of the baffle plate is reduced in order to obtain a high pressure loss in the water flow mixer. The foreign matter was caught on the baffle plate, and the blockage was likely to occur, which was difficult to put into practical use. In the present invention, the water mixer 20 has a small pressure drop, and the water mixer 20 has a pressure drop of, for example, about 0.1 MPa. That is, the dimension L of the flow passage gap is designed so as to obtain this set pressure drop of 0.1 MPa at the portion of the baffle plate 62 that determines the effective diameter of the water flow mixer. The pressure drop of the remaining 0.5 MPa-0.1 MPa = 0.4 MPa that cannot be covered by the water flow mixer 20 should be covered by the pressure adjustment valve 22, in other words, the restriction of the pressure adjustment valve 22 shown in FIG. The effective area of the valve passage 34 at the position is such that the pressure drop of 0.4 MPa is obtained. Therefore, the throttle opening degree by the pressure regulating valve 22 at the normal time may be clogged by foreign matter in sewage in the case of sewage treatment, but when the pressure regulating valve 22 is clogged by foreign matter, the pressure regulating valve 22 is fully opened. By eliminating the throttle state, the flow of foreign matter is promoted, and the blockage by the foreign matter is eliminated. In the embodiment of the present invention, the water mixer 20 is used to form ozone-containing fine bubbles in the pressurized flotation tank in the sewage treatment system. Although the opening area of the baffle plate 62 is designed so that the flow rate is low with a low pressure drop of about 0.1 MPa, the structure of the water flow mixer 20 of the present invention can be used for the treatment of purified water other than sewage, for example. In this case, it is not necessary to consider the possibility of clogging by foreign matter, so that it can be designed to have a high pressure loss and a high flow rate.

  In the present invention, the water flow mixer 20 has a small pressure drop of about 0.1 MPa, and even if sewage is circulated, it is difficult for the foreign matter contained therein to be clogged. There is a concern that clogging of foreign matters such as As a countermeasure, in the embodiment shown in FIG. 7, the free end edge 62A of the baffle plate 62 is formed linearly from end to end, and is used for sewage treatment by forming a straight free end edge 62A. Even if there is a foreign matter that is often included in the sewage and tends to get entangled, it can pass smoothly without stagnation, so that the blockage can be made difficult to occur. As the structure of the baffle plate 62, instead of the straight free end edge 62A that is linear from end to end as shown in FIG. 7, another free end shape that can reduce the entanglement of foreign matter such as hair is used. A thing as shown in FIG. 15 can be adopted. In the embodiment shown in FIG. 15 (a), the baffle plate 162 has the same structure in which one end is welded to the inner peripheral surface of the cylindrical member 70 and extends in the radial direction. 162A is substantially V-shaped recessed toward the center. With this shape of the free edge 162A of the baffle plate 162, it is possible to prevent the hair in the sewage from getting tangled with the baffle plate 162. FIG. 15 (b) shows a baffle plate 262 of another embodiment. In this embodiment, the free end edge 262A of the baffle plate 262 has a shape recessed in an arch shape toward the center. In addition, in another embodiment shown in FIG. 15C, the free end edge 362A of the baffle plate 362 is linear at the center, but both ends are bent linearly. In this embodiment, the baffle plate 362 is also bent. The free edge 362A has a concave shape at the center.

  Hereinafter, the operation of the ozone-containing fine bubble generator of the present invention will be described. That is, the outline of the basic operation of the present invention is as follows. In the normal operation, the opening of the pressure regulating valve 22 is set to an opening (throttle state) that causes a large pressure drop such as 0.4 MPa, Therefore, the crushing of the bubbles in the water flow mixer 20 at a low pressure drop of 0.1 MPa and the substantially direct injection water outflow from the pressure regulating valve 22 with a high pressure loss make it efficient in the treated water storage tank 10. A fine bubble forming action can be obtained. The foreign matter in the sewage can be blocked by the throttle portion of the pressure adjustment valve 22 having a large pressure drop. By detecting this when the blockage occurs, the pressure adjustment valve 22 is automatically fully opened by avoiding the blockage. When the foreign matter is allowed to flow out and the closed state is avoided, the pressure adjustment valve 22 is set to the original throttle opening. On the other hand, if the blocked state cannot be resolved, each device is stopped to prompt the necessary response. Such device control is performed by a control circuit (not shown) having a microcomputer or the like. Hereinafter, the operation of the ozone-containing fine bubble generating apparatus according to the embodiment of the present invention will be described in detail with reference to the flowchart of FIG. 16. When the apparatus is activated, the setting of the number of valve blockage detections N is performed by the processing of block 100. Done. That is, in this embodiment, when the blockage of the foreign matter to the throttle part of the pressure regulating valve 22 is detected, the opening / closing of the pressure regulating valve 22 is repeated the number of times of valve closing detection (N). In the case where the closed state is not resolved regardless of the repeated opening and closing of 22, the operation is stopped by determining that it is a failure. In this embodiment, the valve blockage detection count N is set to 3 times. In the processing of the next block 102, the opening degree of the pressure regulating valve 22 for starting steady operation is set. That is, when the apparatus is stopped, the pressure adjustment valve 22 is in a fully closed state and the valve passage 34 (FIG. 2) is in a fully closed position, but a drive signal is sent to the electric motor 26 to start steady operation, and the pressure adjustment valve The 22 spherical valve bodies 30 are rotated to a predetermined opening position (a throttle state) indicated by a solid line in FIG. The position of the spherical valve body 30 at the predetermined opening position is shown in FIG. 3, and the opening area of the valve passage 34 throttled by the spherical valve body 30 is 0.4 MPa when passing through the pressure regulating valve 22 in the above example. It was set to trigger a descent. In the processing of the next block 104, it is determined whether or not the measured value of the flow rate in the injection water pipe 12 by the flow meter 16 is smaller than a predetermined value L. That is, during steady operation, the pressure regulating valve 22 is throttled to the above predetermined opening, and the flow rate of sewage in the injection water pipe 12 is in accordance with this predetermined opening as long as no foreign matter is blocked. . Therefore, as long as there is no blockage due to foreign matter, the determination result of flow rate ≧ L is obtained, the determination result of the processing block 104 is No, the process returns to block 102, the pressure adjustment valve 22 is maintained at the set opening degree, and the steady operation is continued. The

  As long as it is determined in the process block 104 that the flow rate value of the injection water pipe 12 is ≧ L and the pressure control valve 22 is not blocked, the pressure control valve 22 is kept at the predetermined opening obtained by the process of the block 102. The degree position (the pressure adjusting valve 22 is in the throttle state) is held. In this steady operation, the oxygen containing ozone from the ozone generator 24 is introduced into the injection water pipe 12 and pressurized by the pressurizing pump 18, and the gas within the solubility range is dissolved in the injection water, and excess The gas becomes bubbles, but the bubbles are crushed by the disturbing action of the baffle plate 62. Then, the injected water containing fine bubbles crushed by the water flow mixer 20 passes through the pressure regulating valve 22 and is discharged to the treated water storage tank 10. The surplus gas is dissolved in the injected water due to the pressure drop when passing through the pressure regulating valve 22 to become bubbles. The bubbles released into the water-to-be-treated storage tank 10 include a mixture of what was originally contained in the injection water pipe 12 as an excess and what was generated when the pressure regulating valve 22 passed. And the bubble discharge | released to the to-be-processed water accommodation tank 10 is a fine thing. That is, bubbles originally contained in the injection water pipe 12 are crushed by passing through the water flow mixer 20, and the pressure regulating valve 22 has an outlet horn 44 whose discharge port 38 is extremely shortened in length. Therefore, the bubbles generated by passing through the throttle portion of the pressure regulating valve 22 do not substantially remain in the narrow pipe and are directly treated. Therefore, there is no room for air bubbles to aggregate, and the state of fine bubbles is maintained. For this reason, the mixed bubbles of ozone and oxygen do not substantially pass through the piping, but are directly discharged into the treated water storage tank 10 as they are, and the state of fine bubbles is maintained. Therefore, a large amount of fine bubbles (diameter of several to several tens of μm) having a low floating speed are generated in the treated water storage tank 10 and the floating speed of the fine bubbles is slow. Since sufficient contact time with various germs can be obtained, a desired bactericidal effect can be obtained. Further, since the ozone can be substantially exhausted while the bubbles rise in the treated water storage tank 10, the ozone is not discharged into the atmosphere or the discharge amount is reduced, and the exhaust ozone facility is omitted or The exhaust ozone treatment apparatus can be completed with a small amount, and the cost can be reduced.

  Due to the continuation of the steady operation, the pressure regulating valve 22 (the part of the spherical valve body 30 that restricts the valve passage 34), which is the most restricted part in the injection water pipe 12, may be clogged with foreign matter in the sewage. When it occurs, the injected water flow rate in the injected water pipe 12 measured by the flow meter 16 decreases, and the injected water flow rate <the predetermined value L. In this case, the determination in block 104 of FIG. 16 is Yes, and the process proceeds to processing block 106 where the closed state is stored, a necessary display is displayed, and an alarm is sounded in some cases. In the next block 108, it is determined whether or not the number of valve occlusion detections N <1, and since N = 3 is set by the block 100 at the beginning of the occurrence of the occlusion, the determination in block 108 is No. The control is performed so that the opening degree of the pressure regulating valve 22 is fully opened. That is, a signal for rotating the spherical valve body 30 in the direction of the arrow f in FIG. 2 is sent to the electric motor 26, and the valve passage 34 of the spherical valve body 30 is fully opened as indicated by a two-dot chain line 34A. The effective opening area of the passage 34 is the opening of the inlet / outlet 36, 38. In block 112, a value obtained by subtracting 1 from the current value of the valve blockage detection count N is set as a new value of the valve blockage detection count N. In block 114, 1 second is set in the time waiting timer, and the pressure adjustment valve to the electric motor 26 is set. The supply of the 22 fully open signal is continued. In the next block 116, it is determined whether or not the injected water flow rate is smaller than the predetermined value L. If the determination in block 116 is No, the flow rate increases by fully opening the pressure regulating valve 22, in other words, the blocked state is eliminated. Means that In this case, the timer waits for 20 seconds by the timer in block 118, and then it is confirmed in block 120 whether or not the predetermined flow rate is secured (that is, flow rate ≧ L). At block 122, the occlusion detection memory is reset, the necessary display is made on the display, and if an alarm is issued, it is canceled. Then, in block 124, the valve closing detection count N is set to an initial value 3, and in block 126, a return is made during steady operation. That is, at this time, the spherical valve body 30 of the pressure regulating valve 22 is in the fully open position (the valve opening is in the state of the two-dot chain line 34A), but the electric motor 26 places the spherical valve body 30 in the direction opposite to the arrow f in FIG. A signal for rotating to a predetermined opening position indicated by a solid line is sent. As a result, the pressure regulating valve 22 that causes the desired pressure drop is returned to the normal operation by narrowing the injection water pipe 12.

  If the determination in block 116 is NO, 1 second has passed since the signal was output to the electric motor 26 to fully open the pressure regulating valve 22, but the injected water flow rate did not reach the predetermined value, in other words, the pressure This means that the regulating valve 22 is not opened and the closed state of the pressure regulating valve has not yet been resolved. At this time, the process returns to the block 108 to form a drive signal to the electric motor 26 for fully opening the pressure regulating valve 22. When the flow rate increases to the predetermined value L by this processing, the determination of block 116 becomes NO, so the process passes through the above-described blocks 118, 120, 122 and returns to the steady operation. To do.

  If the flow rate does not return and the closed state is not resolved despite the third operation for fully opening the pressure regulating valve 22, N = 0, so the determination at block 108 is YES and the process proceeds to block 128. Then, it is determined that the flow rate is low, a necessary display or warning is given, the interlock operation is canceled in block 130, and a stop signal is output to each device in block 132. Blocks 108 to 120 and block 128 in the flowchart constitute failure determination means of the present invention.

  17 and 18 show another embodiment of the present invention. In this embodiment, the pressure regulating valve 22 in the first embodiment is omitted, and instead of the injection water pipe 212 from the injection water tank 214, FIG. Two water flow mixers 220 are provided in series at the ends, and the downstream water flow mixers 220 of the two water flow mixers 220 are covered directly or through a relatively short outlet pipe 221, that is, substantially directly. The treated water storage tank 210 is opened. The structure of the water flow mixer 220 is basically the same as that described with reference to FIG. 6 or FIG. 14, and FIG. 18 will be described focusing on the differences. 8 provided with a plate 262 (the shape of the free edge of the baffle plate itself is linear or recessed toward the center of the flow path as in FIGS. 7, 10, 11 and 15). Each of the eight cylindrical members 260 is connected in series (in series) by a through bolt 280 and a nut 282, and the cylindrical member 260 is fixed from the most upstream to the most downstream. It has become. Further, the water flow mixer 220 is provided with a leg portion 283 for fixing to the treated water storage tank 210 at the bottom, and is provided with a connecting pipe 284 for mutual connection at one end and connected to the end of the connecting pipe 284. A flange 286 is provided. That is, the two water flow mixers 220 in this embodiment are connected in series by the bolts 288 and the nuts 290 between the connecting flanges 286. Therefore, the injection water from the injection water tank 214 mixed with ozone from the ozone generator 224 is pressurized by the pressure pump 218 and then passes through a series of two water flow mixers 220 and then into the treated water storage tank 210. Erupted.

  In the embodiment of FIGS. 17 and 18, the pressurized injected water containing ozone passes through 8 × 2 = 16 baffle plates 262 of a series of two water flow mixers 220. As already described in connection with FIG. 6 in the first embodiment, the pressure loss itself in the water flow mixer 220 is relatively small. However, by providing the desired number of baffle plates 262 by the serial arrangement of the two water mixers 220, the desired refinement of the ozone-containing bubbles can be performed, and the water mixer 220 is substantially directly treated. By opening the water storage tank 210, without causing mutual aggregation of bubbles that may occur if a long outlet pipe is used, the water storage tank 210 can be ejected to the treated water storage tank 210 in the state of fine bubbles. The expected sterilization / disinfection performance can be obtained.

  The connection structure of FIG. 18 in which the cylindrical members 260 each incorporating the baffle plate 262 are connected in series and assembled integrally with the bolts 280 and nuts 282 allows the bolts 280 and nuts 282 to be relaxed when foreign matter is clogged. The water flow mixer 220 can be easily disassembled, which is advantageous in terms of maintenance of the water flow mixer.

  Note that the number of water flow mixers 220 is not limited to two, and a desired number of water flow mixers 220 can be arranged in series, and one water flow mixer 220 is provided, and a baffle plate 262 built therein is intended. By increasing the number of the bubbles to 8 (in the above example, 8) that can realize the bubble miniaturization, the same effect can be obtained.

FIG. 1 is a schematic configuration diagram of a microbubble generator according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a pressure regulating valve in the fine bubble generator of FIG. FIG. 3 is an arrow view seen from the direction III in FIG. 2 and explains the positional relationship between the spherical valve element and the valve passage when the injection water pipe is throttled. FIG. 4 is a side view of a throwing type assembly including a pressure regulating valve, an electric motor for driving, and a water surface to a piping portion of the pressure regulating valve in the fine bubble generating device. FIG. 5 is a front view of the throwing type assembly of FIG. FIG. 6 is a cross-sectional view along the longitudinal direction of the water flow mixer in FIG. FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. FIG. 8 is a view taken along the line VIII-VIII in FIG. FIG. 9 is a longitudinal cross-sectional view (a cross-sectional view taken along the line IX-IX in FIG. 10) of an assembly including a baffle plate and a cylindrical member for fixing the baffle plate. FIG. 10 is a left side view of the assembly of FIG. FIG. 11 is a right side view of the assembly of FIG. 12 is a cross-sectional view taken along the line XII-XII in FIG. 13 is a cross-sectional view taken along the line XIII-XIII in FIG. FIG. 14 is a cross-sectional view along the longitudinal direction of a water flow mixer in another embodiment. FIGS. 15A, 15B and 15C are views showing the free edge shape of the baffle plate in different embodiments. FIG. 16 is a flowchart showing the operation of the fine bubble generator of the present invention. FIG. 17 is a schematic configuration diagram of a microbubble generator according to another embodiment of the present invention. FIG. 18 is a detailed side view of the water flow mixer in FIG.

Explanation of symbols

10, 210 ... treated water storage tank (treated part)
12, 212 ... Injection water piping
14, 214 ... Injection water tank 16 ... Flow meter (detection means)
18, 218… Pressure pump
20, 220 ... Water flow mixer 22 ... Pressure regulating valve
24, 224 ... Ozone generator (oxygen-containing gas introduction means)
26: Electric motor (electric drive means)
28 ... Valve housing 30 ... Spherical valve body 32 ... Rotating shaft 34 ... Valve passage 36 ... Suction port 38 ... Discharge port 40 ... Housing 44 ... Outlet horn 46 ... Vertical support 60 ... Cylindrical body
62, 262 ... baffle plate 62A ... free edge of baffle plate
70, 260 ... cylindrical member 72 ... baffle plate assembly 73 ... projection 74 ... notch W ... liquid level

Claims (21)

  An injection water pipe that is opened to a treated part in the water treatment system, an oxygen-containing gas introduction means that introduces an oxygen-containing gas into a water flow in the injection water pipe, and the oxygen-containing gas is installed in the injection water pipe. A pressure pump for pressurizing the introduced water stream, a water flow mixer disposed in the injection water pipe, a pressure regulating valve located in the injection water pipe, and a driving means for driving the pressure regulating valve to be opened; A fine bubble generator characterized by comprising:   2. The fine bubble generating device according to claim 1, wherein the pressure drop value at the pressure regulating valve is larger than the pressure drop value at the water flow mixer.   In the invention according to claim 1, the drive means is installed in an electric drive means for opening and closing the pressure regulating valve and an injection water pipe upstream of the pressure adjustment valve, and the presence or absence of a blockage state of the injection water pipe is determined. It comprises detection means for detecting, and control means for controlling the electric drive means to open the pressure regulating valve to eliminate the blockage state upon detection that the injection water pipe is blocked by the detection means. Fine bubble generator.   According to a third aspect of the present invention, the electric drive means is positioned below the surface of the water to be treated in the portion to be treated, and the electric drive means, the pressure adjustment valve, and the piping to the pressure adjustment valve are flow-tightly accommodated. A fine bubble generating device characterized in that the housing has an upper end extending beyond the water surface.   4. The fine bubble generating apparatus according to claim 3, further comprising a failure determination unit that determines that a failure occurs when the closed state is not resolved regardless of the opening of the pressure regulating valve by the control unit.   In the invention according to claim 5, the failure determination means performs a predetermined number of times of opening the pressure regulating valve, and determines that a failure has occurred when the closed state is not resolved regardless of the number of times of opening the pressure regulating valve. A microbubble generator characterized by the above.   2. The fine bubble generator according to claim 1, wherein the discharge port of the pressure regulating valve is arranged to directly open to the portion to be treated in the water treatment system.   In the invention according to claim 1, the water flow mixer has a cylindrical main body through which a water flow into which an oxygen-containing gas has been introduced, and each is fixed to the cylindrical main body side, and substantially in the middle of the flow path of the injected water. A microbubble generator characterized by comprising a plurality of baffle plates extending in the radial direction and arranged at intervals along the longitudinal direction of the cylindrical main body.   9. The microbubble generator according to claim 8, wherein the free end edge of the baffle plate has a straight shape or a shape recessed toward the center of the flow path.   To-be-treated water storage tank, injection water pipe connected near the bottom of the to-be-treated water storage tank, oxygen-containing gas introduction means for introducing oxygen-containing gas into the water flow in the injection water pipe, and the injection water pipe A pressure pump that pressurizes the water stream with the oxygen-containing gas introduced therein, a pressure regulating valve that is normally positioned in the injection water piping downstream of the pressure pump to throttle the water stream, and a pressure regulating valve when necessary. Drive means for driving to release the water, and the flow of the squeezed injected water from the pressure regulating valve is disposed so as to be discharged substantially directly into the treated water storage tank. A feature of a fine bubble generator.   To-be-treated water storage part, injection water pipe connected near the bottom of the to-be-treated water storage part, oxygen-containing gas introduction means for introducing oxygen-containing gas into the water flow in the injection water pipe, and the injection water pipe A pressure pump that pressurizes the water stream with the oxygen-containing gas introduced therein, a pressure regulating valve that is normally positioned in the injection water piping downstream of the pressure pump to throttle the water stream, and a pressure regulating valve when necessary. And a driving means for driving to open the gas, wherein the pressure regulating valve is located at a predetermined depth from the water surface of the treated water storage tank.   In the invention according to claim 11, the driving means for driving the pressure regulating valve is configured to be electrically operated, and the pressure regulating valve and the electric driving means are positioned so as to be submerged in the treated water in the treated water storage section. A fine bubble generating apparatus comprising a housing that tightly surrounds at least the pressure regulating valve and the electric driving means.   In the invention described in claim 12, the injection water pipe extends from above the water surface in the treated water storage section to the pressure adjustment valve, and the casing is liquid in the injection water pipe in addition to the pressure adjustment valve and the electric drive means. A microbubble generator characterized in that it surrounds a portion extending from a slightly upper surface to a pressure regulating valve.   14. The fine bubble generating device according to claim 1, wherein the oxygen-containing gas contains ozone.   A water flow mixer that is used in an injection water pipe that is opened in a portion to be treated in a water treatment system and disturbs pressurized flowing water, and a cylindrical main body through which the pressurized flowing water passes, and a cylindrical main body A plurality of baffle plates arranged at intervals along the longitudinal direction of each of the baffle plates, and each baffle plate extends substantially radially from the fixing portion on the cylindrical body side to the middle of the flow path to substantially A water flow mixer characterized in that a free edge extending over the entire width is formed, and the free edge of each baffle plate is linear in its entire length or recessed toward the center of the flow path.   The invention according to claim 15 is characterized in that each of the plurality of baffle plates is somewhat inclined toward the downstream side in the flow direction on the front surface in the flow direction of the pressurized flowing water in the cylindrical main body. Water flow mixer.   The water flow mixer according to claim 15 or 16, wherein the baffle plate has a plurality of grooves formed on a front surface or a rear surface in a flow direction of the pressurized flowing water.   The invention according to any one of claims 15 to 17, wherein each baffle plate is fixed to a cylindrical member inserted into the cylindrical main body, and the cylindrical main body adjacent in the longitudinal direction is an end in the cylindrical main body. A water flow mixer characterized by having a partial contact structure.   The invention according to claim 18 is characterized in that the opposing end faces of the adjacent cylindrical members are provided with a groove on one side and the other in the circumferential direction, and the protrusion and the groove are fitted to each other. A water flow mixer.   An injection water pipe that is opened to a treated part in the water treatment system, an oxygen-containing gas introduction means that introduces an oxygen-containing gas into a water flow in the injection water pipe, and the oxygen-containing gas is installed in the injection water pipe. A pressurizing pump for pressurizing the introduced water flow, and a plurality of baffle plates arranged downstream from the pressurizing pump and spaced along the longitudinal direction of the cylindrical main body through which the pressurized flowing water passes A microbubble generator characterized by comprising: a water flow mixer comprising: a water flow mixer, wherein the water flow mixer opens substantially directly into the portion to be treated. The invention according to any one of claims 15 to 20, wherein the cylindrical main body is composed of a plurality of cylindrical members connected in series in the longitudinal direction, and the most upstream and the most downstream cylindrical members are fixed. Bubble generator.

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