JP2006329362A - Sealing structure and discharging method of infiltrating water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure and a discharging method of infiltrating water capable of extending life of sealing by preventing a solid material from intruding in a sealing sliding face which causes wear. <P>SOLUTION: An impeller 4 is fixed to a rotation shaft 1 and a gutter 4C and a gutter 4D are formed at a soil water side and an oil seal 2B side at right angles to the axial direction of a rotation shaft 22A. When the impeller 4 rotates, flow is generated in the gutter 4C of the soil water side by centrifugal force of the impeller. As static pressure of periphery of the gutter 4C is lowered by the flow, fluid which does not contain solid material of inside of the impeller 4 is sucked out from a clearance 4A of the impeller 4 and a fixing ring 5. When the gutter 4D at the sealing side of the impeller 4 rotates in a mixing chamber 5D of the fixing ring 5, eddy flow is generated in the mixing chamber 5D by centrifugal force of fluid spattering out from the gutter 4D. Thus, because the fluid entering in the mixing chamber 5D from a suction port 5A is discharged into the soil water from a discharging port 5B as its pressure is raised along with rotation of the impeller according to a principle of vortex flow pump, intrusion of the solid material into the sealing sliding face can be prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seal structure and a method for discharging intruded water, and more particularly to a seal structure that prevents leakage of sewage from a rotating shaft that transmits power to a rotating body in sewage in which solid matter is suspended, and the seal wear is reduced. The present invention relates to a seal structure that can be prevented with a simple structure and can be operated without leaking sewage for a long period of time, and a method for discharging intrusion water.

  In a fluid conveyance device such as a screw or a pump, a seal is provided to prevent water leakage from a rotating shaft that transmits power to a rotating body in water. There are many types of seals for rotating bodies, such as labyrinth seals, oil seals, and mechanical seals, but oil seals that are space-saving and easy to replace are generally used. The oil seal fits and fixes the outer peripheral portion to the seal housing, and seals by pressing a contact portion called a lip formed on the inner peripheral portion against the rotating shaft to prevent water leakage.

In Patent Document 1, a rotary shaft is rotatably supported by a radial bearing and a pair of thrust bearings sandwiching the radial bearing, and a herringbone pattern is formed on the inner peripheral surface of the radial bearing. A dynamic pressure bearing unit in which a dynamic pressure generating groove is formed is disclosed. In this hydrodynamic bearing unit, the working fluid does not circulate in the interior and leak out of the bearing. Therefore, even if it is used in a submerged or dry environment, it is smooth with a small torque. The shaft can be rotated.
JP-A-8-42563

  However, among the above-described fluid transfer devices, those used in sewage in which fine solids such as sand are suspended are lipged when the solids enter the seal lip and the sliding surface of the rotary shaft. As a result, the lip is worn out and the lip is damaged.

  In response to this problem, measures were taken to eliminate the solid matter by injecting grease on the sliding surface. However, since the solid matter cannot be completely eliminated, the period until the sewage leaks hardly extends. Furthermore, since it was necessary to inject grease more frequently, there was a problem that maintenance costs increased. In addition, the material has been studied, such as changing the seal material to a highly wear-resistant resin, but there are currently no seals that can provide good wear resistance over a long period of time. is there.

  In addition, the dynamic pressure bearing unit of Patent Document 1 circulates the working fluid inside the dynamic pressure bearing unit to improve the hermeticity of the inside of the bearing so that the rotating shaft can be smoothly rotated with a small torque at the time of starting the rotary shaft. It was made for the purpose, not for the purpose of improving the wear resistance of the seal.

  The present invention has been made in view of such a problem, and a seal structure capable of extending the life of the seal by preventing the solid matter that causes wear from entering the seal sliding surface. The purpose is to provide a method for discharging intrusion water.

In order to achieve the above object, the invention according to the first aspect of the present invention provides a seal box in which a rotating shaft that transmits power to a rotating body in water is disposed, and is fixed to the seal box and is fixed to the seal box. A seal member that prevents water leakage from the periphery of the rotary shaft by abutting the lip portion against the rotary shaft, and is disposed on the water side of the seal, and is fixed to the rotary shaft within the seal box And an impeller having a number of grooves formed in a direction orthogonal to the rotation axis on the water side.

  According to the first aspect of the invention, the suction effect by the radial pump action of the impeller that rotates integrally with the rotating shaft can surely prevent the intrusion of the solid matter that causes the seal wear, It is possible to prevent seal wear and extend the service life.

  In order to achieve the above object, the invention according to claim 2 provides a seal box in which a rotating shaft that transmits power to a rotating body in water is disposed, and is fixed to the seal box and A seal member that prevents water leakage from the periphery of the rotary shaft by abutting the lip portion against the rotary shaft, and is disposed on the water side of the seal, and is fixed to the rotary shaft within the seal box And an impeller in which a number of grooves perpendicular to the rotation axis are formed on the seal side, and a fluid introduction passage for introducing fluid into a space sandwiched between the seal and the impeller It is formed in a seal box.

  According to the invention described in claim 2, it is possible to reliably prevent the intrusion of solid matter that causes the wear of the seal by the pushing effect by the vortex pump action of the impeller that rotates integrally with the rotating shaft, It is possible to prevent seal wear and extend the service life. Further, the solid matter that has entered between the impeller and the seal when the rotation is stopped can be discharged into the water discharge by the vortex pump action.

  In order to achieve the above object, the invention according to claim 3 provides a seal box in which a rotating shaft that transmits power to a rotating body in water is disposed, and is fixed to the seal box and is fixed to the seal box. A seal member that prevents water leakage from the periphery of the rotary shaft by abutting the lip portion against the rotary shaft, and is disposed on the water side of the seal, and is fixed to the rotary shaft within the seal box A plurality of grooves perpendicular to the rotation axis are formed on the water side, and an impeller having a plurality of grooves orthogonal to the rotation axis is formed on the seal side. And a fluid introduction flow path for introducing a fluid into a space sandwiched between the impeller and the impeller.

  According to the third aspect of the present invention, the impregnation effect of the radial pump of the impeller rotating integrally with the rotary shaft and the extrusion effect of the liquid by the vortex pump action prevent the intrusion of the solid matter that causes the seal wear. It can be surely prevented, and the wear of the seal can be prevented and the life can be extended. Further, the solid matter that has entered between the impeller and the seal when the rotation is stopped can be discharged into the water by the vortex pump action.

  According to a fourth aspect of the present invention, in the first or third aspect of the invention, the plurality of grooves formed on the water side of the impeller are inclined with respect to a rotation direction of the rotation shaft. It is characterized by being formed.

  According to the fourth aspect of the present invention, since the groove on the water side of the impeller is formed to be inclined, a large suction effect can be obtained.

  The invention according to claim 5 is the invention according to claim 3 or 4, wherein the fluid introduction flow path is provided with a pump for introducing fluid into a space sandwiched between the seal and the impeller. The pump is ON / OFF controlled based on the rotational speed of the rotary shaft.

  According to the fifth aspect of the present invention, when the rotational speed of the rotary shaft is low, the liquid extrusion effect cannot be sufficiently obtained. In this case, the liquid is forcibly introduced by the pump and the extrusion is performed. Help the effect. The forced introduction by the pump is stopped when the rotational speed of the rotating shaft reaches a rotational speed sufficient to obtain a sufficient extrusion effect, and the liquid is pushed out by the extrusion effect generated only by the rotation of the impeller.

  According to a sixth aspect of the present invention, in the third or fourth aspect of the present invention, the fluid introduction channel is provided with a pump for introducing fluid into a space sandwiched between the seal and the impeller. The pump is ON / OFF controlled based on a pressure in a space sandwiched between the seal and the impeller.

  According to the invention described in claim 6, when the rotational speed of the rotary shaft is low, that is, the pressure in the space between the seal and the impeller measured by the pressure gauge is higher than a predetermined negative pressure. If it is high, the liquid extrusion effect cannot be sufficiently obtained. In this case, the liquid is forcibly introduced by a pump to assist the extrusion effect. Then, when the rotational speed of the rotating shaft reaches a rotational speed sufficient to obtain a sufficient extruding effect, that is, when a predetermined negative pressure at which the extruding effect by negative pressure attraction can be obtained is forcibly introduced by the pump. The liquid is pushed out by the extrusion effect generated only by the rotation of the impeller.

  Invention of Claim 7 uses the impeller as described in any one of Claims 3-6, and the groove | channel on the seal side of this impeller and the groove | channel on the water side are said groove | channels with axial rotation. The mixing chamber through which the pressure passes is boosted by the principle of the vortex pump, and the water on the seal side is discharged to the water side with the impeller interposed therebetween.

  The invention described in claim 8 is characterized in that, in the invention described in claim 7, the discharge of the discharged water is induced by negative pressure by the water-side groove by the rotation of the impeller.

  According to the seal structure and the intruding water discharge method according to the present invention, the suction effect by the radial pump action and / or the push-out effect by the vortex pump action can surely prevent the intrusion of the solid matter that causes the seal wear. Therefore, it is possible to prevent the seal from being worn and to prolong its service life. In addition, since the solid matter that has entered when the rotation is stopped can be discharged into the water by the pumping action, damage and breakage of the seal due to the solid matter that has entered can be prevented.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a sealing structure and a method for discharging intrusion water according to the present invention will be described below in detail with reference to the accompanying drawings.

  First, a rotating flat membrane module to which the seal structure of the embodiment is applied will be described.

  FIG. 1 is an overall perspective view including a partially broken portion of the rotating flat membrane module 10, and FIG. 2 is a perspective view showing a part of the internal configuration. 3 is a plan sectional view showing a part of the internal configuration of the rotary flat membrane module 10, and FIG. 4 is a perspective view showing the configuration of the rotary flat membrane disk.

  As shown in FIG. 1, the rotary flat membrane module 10 has a treatment tank 14, and raw water (sewage in which solids are suspended) flows into the treatment tank 14 from an inflow pipe 16. A large number of rotating flat membrane disks 12, 12,... Are provided inside the processing tank. The rotating flat membrane disk 12 is attached to three rotating shafts 22A, 22B, and 22C arranged in parallel as shown in FIG. 2 at a predetermined interval.

  The rotary shafts 22A to 22C are connected to the output shafts of the motors 20A, 20B, and 20C via seal portions 17A, 17B, and 17C and bearing portions 18A, 18B, and 18C provided outside the processing tank 14 of FIG. ing. Therefore, the rotating shafts 22A to 22C can be rotated by driving the motors 20A to 20C. In addition, each motor 20A-20C rotationally drives the rotating shafts 22A-22C in the same direction. Reducers 21A, 21B, and 21C are provided between the motors 20A to 20C and the couplings 18A to 18C, and the rotational speeds of the motors 20A to 20C are decelerated to a predetermined rotational speed.

  The rotating shafts 22A to 22C are formed in a hollow shape, and the inside thereof communicates with the inside of each of the rotating flat membrane disks 12, 12,. Further, the inside of the rotating shafts 22A to 22C is communicated with the treated water pipe 24, and a suction force is generated inside by driving the pump 26, and the fluid in the rotating shafts 22A to 22C is discharged from the treated water pipe 24. ing. In addition, the code | symbol 27 of FIG. 1 is a flowmeter which measures the flow volume of the treated water which flows through the treated water pipe 24. FIG. Reference numeral 28 denotes a drain pipe for draining concentrated water from the treatment tank 14, and reference numeral 30 denotes a control panel in which a control system of the rotating flat membrane module 10 is accommodated.

  As shown in FIGS. 3 and 4, the rotating flat membrane disk 12 is provided with a circular support plate 32 called a disk, water-permeable spacers 34 provided on both sides of the support plate 32, and further provided on both outer surfaces thereof. The circular filter membrane 36 is formed. The spacer 34 is formed by combining a nonwoven fabric, punching metal, or the like, and has water permeability. As the filtration membrane 36, an ultrafiltration membrane (UF membrane) is used, and as a material thereof, for example, a polymer resin membrane such as polystyrene, polypropylene, polyethylene, or polyolefin is used. The type of the filtration membrane 36 is not limited to an ultrafiltration (UF) membrane, and a microfiltration (MF) membrane, a nanofiltration (NF) membrane, a reverse osmosis (RO), or the like may be used.

  The support plate 32 is made of a hard vinyl chloride resin, is formed in a disc shape, and the outer edge portion 32A is formed wide across the entire circumference. The spacer 34 and the filtration membrane 36 are attached to a portion inside the outer edge portion 32A. The width w1 of the outer edge portion 32A is formed larger than the thickness t1 of the portion where the spacer 34 and the filtration membrane 36 are provided, and the outer edge portion 32A is formed so as to protrude from the membrane surfaces of the filtration membranes 36 and 36.

  The spacer 34 and the filtration membrane 36 are fixed to the support plate 32 by adhesion. The adhesive is applied to the outer edges of the spacer 34 and the filtration membrane 36 over the entire circumference, and the adhesive prevents the liquid from leaking from the outer edges of the spacer 34 and the filtration membrane 36.

  The rotating flat membrane disk 12 is attached to predetermined positions of the rotating shafts 22A to 22C via the liquid ring 38 shown in FIG. As shown in FIG. 3, holes 23A to 23C are formed in the rotating shafts 22A to 22C at the mounting positions of the spacers 34 of the rotating flat membrane disk 12, and the liquid that has passed through the spacers 34 passes through the holes 23A to 23C. It is comprised so that it may flow in-22C. The liquid seal ring 38 prevents leakage to the outside.

  As shown in FIG. 2 or 3, the rotating flat membrane disk 12 configured as described above includes the rotating flat membrane disks 12, 12... Attached to the rotating shaft 22A, and the rotating flat membrane attached to the rotating shaft 22B. The disks 12, 12... Are alternately arranged in the axial direction, and both the rotating flat membrane disks 12, 12 are partially overlapped when viewed from the axial direction. Similarly, the rotating flat membrane disks 12, 12,... Attached to the rotating shaft 12B and the rotating flat membrane disks 12, 12,... Attached to the rotating shaft 12C are alternately arranged in the axial direction and viewed from the axial direction. The two rotating flat membrane disks 12 are arranged so as to partially overlap each other.

  Next, the operation of the rotating flat membrane module 10 will be described.

  First, while the motors 20A to 20C in FIG. 1 are driven to rotate each rotating flat membrane disk 12, the pump 26 is driven to generate a suction force inside each rotating flat membrane disk 12. As a result, the raw water is sucked into the rotary flat membrane disk 12 through the filtration membrane 36 of the rotary flat membrane disk 12, and the raw water is filtered at that time. The treated water after filtration passes through the spacer 34 of the rotating flat membrane disk 12 and is sucked into the rotary shafts 22A to 22C, and is sent to the subsequent equipment through the treated water pipe 24. In such a filtration process, a membrane surface flow velocity is imparted to the membrane surface of the filtration membrane 36 by the rotation of the rotating flat membrane disk 12. Therefore, the filtration membrane 36 is less likely to be clogged, and the filtration process can be continuously performed for a long time.

  FIG. 5 is a cross-sectional view showing the structure of the seal portion 17A and the bearing portion 18A of the rotating shaft 22A, and FIG. 6 is an enlarged cross-sectional view of the seal portion 17A. Note that the structures of the seal portions 17B and 17C and the bearing portions 18B and 18C of the rotary shafts 22B and 22C are the same as the structures of the seal portion 17A and the bearing portion 18A, and thus the description thereof is omitted here.

  The bearing portion 18A shown in FIG. 5 has a structure in which the end portion of the rotating shaft 22A is rotatably supported on the bearing housing 42 via the radial ball bearing 40. A double lip type oil seal 44 is disposed on the radial ball bearing 40 on the motor 20A (see FIG. 1) side, and a single lip type oil seal 46 is disposed on the seal portion 17A side of the radial ball bearing 40. . The oil seals 44 and 46 are fitted and fixed at the outer peripheral portion thereof to the inner peripheral portion of the bearing housing 42, and the lip portion of the inner peripheral portion is pressed and abutted with a predetermined elasticity on the outer peripheral surface of the rotating shaft 22A. . This bearing portion 18A also employs a water leakage prevention structure. The bearing housing 42 is configured by connecting donut-shaped auxiliary parts 42B and 42C to both side surfaces of a ring-shaped main body 42A, an oil seal 44 is provided in the auxiliary part 42B, and an oil seal 46 is provided in the auxiliary part 42C. Each is attached.

  On the other hand, as shown in FIGS. 5 and 6, the seal portion 17A includes a double lip type oil seal 2A, a single lip type oil seal 2B, a seal box 3 in which the outer peripheral surfaces of the oil seals 2A and 2B are fitted and fixed, a rotating shaft An impeller 4 fixed to 22A and a fixing ring 5 fixed to the seal box 3 are included.

  Further, in order to inject a fluid that does not contain solid matter between the oil seal 2B and the fixing ring 5, the seal box 3 is formed with an inlet (fluid introduction channel) 3A. A backflow prevention valve 7 is provided on the upstream side of the inlet 3 </ b> A in order to prevent the fluid from flowing back due to a trouble of a water injection device including the pump 6 and the solid matter entering the seal side. The fluid injected into the inlet 3A passes through the suction port 5A and the discharge port 5B formed in the fixing ring 5 through the through hole 8 of the oil seal 2B, and the clearance 4a between the impeller 4 and the fixing ring 5. To be discharged into sewage.

  The present invention has a mechanism for injecting a fluid containing no solid matter between the oil seal 2B and the impeller 4 so as not to infiltrate the solid matter in the sewage that causes wear and to eliminate it even if it enters. Yes, in order to further improve the reliability of this mechanism, the impeller 4 and the fixing ring 5 are provided so that solid matter in the sewage is not surely infiltrated by the pump action (negative pressure attraction). The biggest feature.

  The pumping action of the embodiment includes a radial pumping action by the impeller 4 and a vortex pumping action by the mixing chamber 5 </ b> D formed in the impeller 4 and the fixing ring 5. Hereinafter, these pump actions will be described in detail.

  First, the radial pump action will be described.

  The impeller 4 is fixed to the rotary shaft 1 with screws 8, and grooves 4C and 4D are formed on the sewage side and the oil seal 2B side in a direction perpendicular to the axial direction of the rotary shaft 22A as shown in FIG. . When the impeller 4 rotates, a flow as indicated by an arrow 4E in FIG. 6 is generated in the sewage-side groove 4C by the centrifugal force. This flow reduces the static pressure on the outer periphery of the groove 4 </ b> C, so that fluid that does not contain solid matter inside the impeller 4 is sucked out from the clearance 4 </ b> A between the impeller 4 and the fixing ring 5. This is a radial pump action, and a large number of grooves 4C are formed at equal intervals on the entire circumference of the impeller 4, so that fluid is evenly sucked from the entire circumference of the rotating shaft 22A to the sewage side. As a result, it is possible to reliably prevent solids from entering from the impeller 4 to the oil seal 2B side.

  Next, the eddy current pump action will be described.

  The fixing ring 5 is fixed to the seal box 3, and a mixing chamber 5D having an elliptical cross section is formed in the inner periphery as shown in FIGS. Further, the mixing chamber 5D is divided by a partition plate (not shown) at only one place so as to escape the impeller 4. A suction port 5A and a discharge port 5B are formed so as to sandwich the partition plate.

  When the groove 4D on the seal side of the impeller 4 rotates inside the mixing chamber 5D, the mixing chamber 5D is pressurized by the centrifugal force of the fluid popping out from the groove 4D, and the mixing chamber 5D is indicated by the arrow 5F in FIG. A vortex flow (circulation flow) is generated. Therefore, the fluid entering the mixing chamber 5D from the suction port 5A is pressurized with the rotation of the impeller 4 and discharged from the discharge port 5B into the sewage according to the principle of a jet pump similar to a known vortex pump. At this time, the fluid entering from the suction port 5A is released from the clearance 4A into the sewage while being pressurized, so that it has the effect of extruding the fluid evenly from the entire circumference together with the radial pump action, and is surely solid. Can be prevented.

  By the radial pump action and the eddy current pump action described above, it is possible to reliably prevent the intrusion of solid matter that causes the oil seal 2B to wear. As a result, it is possible to prevent wear and extend the life of the oil seal 2B. Further, since the solid matter that has entered between the oil seal 2B and the impeller 4 when the rotation is stopped can be discharged into the sewage water by the pumping action, the oil seal 2B is prevented from being damaged or broken due to the solid matter that has entered. be able to.

  In the embodiment, the above-described effect is obtained by both the radial pump action and the vortex pump action. However, the above effect can be obtained by only one of the radial pump action and the vortex pump action. it can.

  Further, according to the impeller 4 of the embodiment, the sewage-side grooves 4C, 4C,... Are inclined with respect to the rotational direction of the impeller 4 indicated by the arrow A in FIG. be able to. Moreover, 15-30 degrees was suitable for the inclination-angle of the groove | channel 4C by experiment.

  Further, the pump 9 shown in FIG. 6 is ON / OFF controlled by the control unit 50 based on the rotational speed from the rotary encoder 9 that detects the rotational speed of the rotary shaft 22A. That is, when the rotational speed of the rotary shaft 22A is low, the fluid pushing effect by the groove 4D of the impeller 4 cannot be sufficiently obtained. In this case, the fluid is forcibly introduced by the pump 6 and pushed out. Help the effect. The forced introduction by the pump 6 is stopped when the rotational speed of the rotating shaft 22A reaches a rotational speed sufficient to obtain a sufficient extrusion effect, and the fluid is pushed out by the extrusion effect generated only by the rotation of the impeller 4.

  In FIG. 6, reference numeral 52 denotes a tank for storing fluid. The fluid stored in the tank 52 may use raw water filtered by the rotating flat membrane module 10. Reference numeral 54 denotes a metal sleeve which is fitted to the rotating shaft 22A and pressed against the lip 2C of the oil seal 2B. Reference numeral 56 denotes a ring spring that presses the lip portion 2C against the outer peripheral surface of the sleeve 54, and reference numeral 58 denotes an O-ring for maintaining the water-tightness between the oil seal 2B and the seal box 3. Further, reference numeral 60 is a ring member that holds the fixing ring 5 between the oil seal 2 </ b> B and 62 is a bolt that fixes the ring member 60 to the seal box 3. Furthermore, reference numeral 64 in FIG. 5 is a rubber tube for flexibly fixing the seal box 3 to the processing tank 14.

  Further, as shown in FIG. 6, a pressure sensor 70 for detecting the pressure in the space between the oil seal 2B and the impeller 4 is provided in the oil seal 2B, and based on the pressure (negative pressure) detected by the pressure sensor 70, The control unit 50 may perform ON / OFF control of the pump 6.

  That is, when the rotational speed of the rotating shaft 22A is low, that is, the pressure in the space between the oil seal 2B and the impeller 4 measured by the pressure sensor 70 is a predetermined negative pressure (for example, about −49). If it is higher than -59 Pa), the liquid extrusion effect cannot be sufficiently obtained. In this case, the liquid is forcibly introduced by the pump 6 to assist the extrusion effect. Then, when the rotational speed of the rotary shaft 22A reaches a rotational speed sufficient to obtain a sufficient pushing effect, that is, when a predetermined negative pressure at which a pushing effect by negative pressure induction can be obtained is reached by the pump 6. The forced introduction is stopped, and the liquid is pushed out by the extrusion effect generated only by the rotation of the impeller 4.

  FIG. 9 is an enlarged view of a main part showing a mounting structure of the pressure sensor 70. In this drawing, a drawing structure of the signal cable 72 of the pressure sensor 70 and a leakage prevention structure associated therewith are shown.

  First, the structure for taking out the signal cable 72 will be described. The oil seal 2B is formed with a through hole 74 that allows the signal cable 72 to pass therethrough. Is formed. With this structure, the signal cable 72 of the pressure sensor 70 provided on the oil seal 2B can be pulled out.

  Next, the leakage prevention structure will be described. The through-hole 76 formed in the seal box 3 is a screw hole, and a bolt-shaped leak-proof plug 78 is screwed into the through-hole 76 of the screw hole. The signal cable 72 is inserted into the cylindrical male screw portion 80 of the plug 78, and then inserted into the through hole 84 of FIG. 10 formed in the metal head portion 82 of the plug 78 and pulled out. The through hole 84 is filled with an elastic resin 86 to prevent leakage from the through hole 84, and the outlet of the through hole 84 is closed with a curable resin 88 shown in FIG. Further, the plug 78 is screwed into the through hole 76 through the washer 90 and the packing 92, and leakage from the through hole 76 is prevented.

  With the above structure, the signal cable 72 of the pressure sensor 70 is drawn out to prevent leakage accompanying the drawing.

Whole perspective view of rotating flat membrane module to which seal structure of embodiment is applied The perspective view which showed a part of internal structure of the rotation flat membrane module of FIG. Plan sectional drawing which showed a part of internal structure of the rotation flat membrane module of FIG. Perspective view showing the configuration of a rotating flat membrane disk Sectional drawing of the seal part and bearing part of the rotating flat membrane module shown in FIG. Enlarged sectional view of the seal portion shown in FIG. The perspective view of the impeller provided in the seal part of FIG. The principal part expansion perspective view which showed the relationship between the impeller and the mixing chamber of a fixed ring Fig. 6 is an enlarged view of the main part showing the mounting structure of the pressure sensor of Fig. 6. Expanded cross-sectional view of the main part showing the mounting structure of the signal cable to the leak-proof plug

Explanation of symbols

  2A, 2B ... Oil seal, 3 ... Seal box, 3A ... Inlet, 4 ... Impeller, 4C, 4D ... Groove, 5 ... Fixed ring, 5D ... Mixing chamber, 6 ... Pump, 7 ... Backflow prevention valve, 10 ... Rotating flat membrane module, 17, 17B, 17C ... Sealing part, 22A, 22B, 22C ... Rotating shaft, 50 ... Control part, 52 ... Tank, 70 ... Pressure sensor, 72 ... Signal cable, 78 ... Plug

Claims (8)

A seal box in which a rotating shaft for transmitting power to a rotating body in water is disposed, and water leakage from the periphery of the rotating shaft by being fixed to the seal box and its lip portion being in contact with the rotating shaft And a sealing member for preventing
An impeller disposed on the water side of the seal and fixed to the rotating shaft in the seal box and having a plurality of grooves formed in a direction orthogonal to the rotating shaft on the water side. Characteristic seal structure. A seal box in which a rotating shaft for transmitting power to a rotating body in water is disposed, and water leakage from the periphery of the rotating shaft by being fixed to the seal box and its lip portion being in contact with the rotating shaft And a sealing member for preventing
An impeller disposed on the water side of the seal and fixed to the rotating shaft in the seal box and having a plurality of grooves formed in a direction orthogonal to the rotating shaft on the seal side; A seal structure, wherein a fluid introduction channel for introducing a fluid into a space between the impeller and the impeller is formed in the seal box. A seal box in which a rotating shaft for transmitting power to a rotating body in water is disposed, and water leakage from the periphery of the rotating shaft by being fixed to the seal box and its lip portion being in contact with the rotating shaft And a sealing member for preventing
It is disposed on the water side of the seal, and is fixed to the rotating shaft in the seal box, and a number of grooves perpendicular to the rotating shaft are formed on the water side. It has an impeller in which a number of grooves perpendicular to the rotation axis are formed, and a fluid introduction channel for introducing a fluid into a space sandwiched between the seal and the impeller is formed in the seal box. Seal structure characterized by   4. The seal structure according to claim 1, wherein a plurality of the grooves formed on the water side of the impeller are formed to be inclined with respect to a rotation direction of the rotation shaft.   The fluid introduction flow path is provided with a pump for introducing a fluid into a space sandwiched between the seal and the impeller, and the pump is ON / OFF controlled based on the number of rotations of the rotating shaft. The seal structure according to claim 3 or 4, wherein the seal structure is provided.   The fluid introduction flow path is provided with a pump for introducing a fluid into a space sandwiched between the seal and the impeller, and the pump has a pressure in a space sandwiched between the seal and the impeller. The seal structure according to claim 3, wherein ON / OFF control is performed based on   The impeller according to any one of claims 3 to 6, wherein the mixing chamber through which the groove passes as the groove on the seal side and the water side of the impeller passes through the shaft rotation is an eddy current pump. A method for discharging intruding water, wherein the pressure is increased by the principle and the water on the seal side is discharged to the water side with the impeller interposed therebetween.   8. The method for discharging intrusion water according to claim 7, wherein the discharge of the discharged water is induced by negative pressure by the water-side groove by the rotation of the impeller.

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