JP2011052640A - Fluid dispersion pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid dispersion pump capable of carrying dispersed fluid while dispersing two fluids. <P>SOLUTION: The pump includes a stator frame 25 enclosing a cylindrical stator 24, a rotor 13 inserted into the stator frame 25 containing rotary shaft 15 having both end sides respectively connected to the first impeller 40 and second impeller 50, first casings 35, 22 fixed to the stator frame 25 so as to accommodate the first impeller 40 and equipped with a first fluid supply port 38 and first fluid outflow port 39, second casings 45, 23 fixed to the stator frame 25 so as to accommodate the second impeller 50 and equipped with a second fluid supply port 48 and second fluid outflow port 49, and a dispersion part 51 which is provided inside the second casing and which disperses the second fluid supplied through the second fluid supply port 48 and a part of the first fluid supplied into the second casing through a can clearance 34 in the stator frame 25. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fluid dispersion pump for distributing two fluids, for example, delivering these fluids while dispersing fine bubbles in the liquid.

  In the industrial field, operations for dispersing two fluids and further transporting the dispersed fluid are widely performed.

  In particular, in recent years, for example, in the field of dispersing a gas in a liquid, with the diversification of processes, and in order to increase the efficiency and speed of the reaction, it is required to make the gas fine and disperse in the liquid. A lot is happening.

  Various types of microbubble generators for miniaturizing bubbles have been proposed in Non-Patent Document 1 and the like. For example, (a) channel expansion method using a Venturi tube or the like (see Non-Patent Document 2 and Patent Document 1), (b) Supersaturated precipitation method of pressurized dissolved gas (pressurized dissolution method), (c) Swivel There are a bubble bubble shearing method (swirl flow method), (d) a high-pressure opening method using an orifice or the like, (e) a gas discharging method from a fine hole, and (f) a bubble breaking method using ultrasonic waves or a machine.

  Both methods devise various methods for generating bubbles and destroying generated bubbles. In particular, the methods (a) to (d) are based on pressure fluctuations and water flow, the method (e) is by reducing the diameter of the gas discharge hole, and the method (f) is a power other than water flow (medium This is due to vibration or mechanical shearing.

JP2003-230824

Hirofumi Taisei, “Basics of Microbubbles”, Foam Engineering, 2005, pp. 423-429 Reiko Fujiwara, “Microbubble generation method using Venturi tube”, Eco-Industry, 2006, Vol. 11, no. 3, 27-30

  Each of these various methods has advantages and disadvantages, but a particular problem is the need for a pump to generate pressure. For example, in the method (a), the gas-liquid mixed fluid is conveyed to the venturi tube, in the methods (b) and (d), for pressurization, in the method (e), the fluid is passed through the fine holes, etc. Each requires a pump for pressurizing the fluid.

  Furthermore, in the various methods described above, a separate pump is required for flowing the gas-liquid dispersion fluid in which bubbles are refined and dispersed into a reaction vessel or the like according to the purpose of use. That is, a pump is required to create the fine bubbles and to transport the gas-liquid mixed flow in which the fine bubbles are created. As a result, there has been a problem that the apparatus is enlarged as a whole.

  Therefore, the technical problem to be solved by the present invention is to provide a fluid dispersion pump capable of conveying a dispersed fluid while dispersing two fluids.

  In order to solve the above technical problem, the present invention provides a fluid dispersion pump having the following configuration.

According to the first aspect of the present invention, a stator frame containing a cylindrical stator,
A rotor inserted into the stator frame having a rotation shaft connected to the first impeller and the second impeller on both ends, respectively;
A first casing fixed to the stator frame so as to accommodate the first impeller and the rotating shaft, and having a first fluid supply port and a first fluid outlet;
A second casing fixed to the stator frame so as to accommodate the second impeller and the rotating shaft, and having a second fluid supply port and a second fluid outlet;
A part of the first fluid provided in the second casing and supplied from the second fluid supply port through the can gap in the stator frame and the second fluid supplied from the second fluid supply port. A dispersion unit to be dispersed;
A fluid dispersion pump is provided.

  According to the second aspect of the present invention, the first fluid is a liquid, the second fluid is a gas, and the dispersion unit is a fine bubble generating mechanism that disperses the gas as fine bubbles in the liquid. An aspect of the fluid dispersion pump is provided.

According to a third aspect of the present invention, the dispersing unit is
A dispersion unit body configured in an annular shape;
A flow path reducing portion configured to gradually reduce a cross-sectional area; a flow path expanding portion configured to gradually increase a cross-sectional area of the flow path; and the flow path reducing portion and the flow path expanding portion. A dispersion pump according to a second aspect is provided, characterized in that a dispersion flow path having a minimum gap portion is provided at a boundary portion between the first and second embodiments.

  According to a fourth aspect of the present invention, there is provided the fluid dispersion pump according to the third aspect, wherein the dispersion flow path is configured as a pipe line penetrating the dispersion portion main body.

According to a fifth aspect of the present invention, it comprises a bearing provided in the stator frame for supporting the rotor in the stator frame, and a bearing support portion for holding the bearing,
Any one of the fluids according to any one of the first to fourth aspects, characterized in that a flow passage that communicates the inside of the first casing and the second casing and the inside of the stator frame is provided in the bearing support portion. A dispersion pump is provided.

According to a sixth aspect of the present invention, the first impeller includes a disc-shaped impeller body portion and a centrifugal blade that sends out the first fluid,
The impeller body includes a through hole that communicates the front and back sides of the impeller body. The fluid dispersion pump according to any one of the first to fifth aspects is provided.

  According to a seventh aspect of the present invention, any one of the first to fifth aspects is characterized in that the second fluid outlet is in communication with a dispersion flow pipe that is in communication with the first fluid outlet. One fluid dispersion pump.

  According to the present invention, for example, the impellers can be provided at both ends of the rotating shaft, respectively, so that the first fluid and the second fluid can flow out. In addition, a canned motor is used as a pump-driven motor, the first fluid is supplied into the second casing through the can gap, and the two fluids are dispersed by a dispersing portion provided in the second casing. According to the present invention, since the first and second fluids are dispersed by separate impellers, the efficiency of the dispersion can be improved, and not only the fluid transfer but also the two fluids in the back side region. Since it is configured to perform the dispersion, the fluid can be dispersed and transported simultaneously.

  According to the second aspect of the present invention, the first fluid may be a liquid, the second fluid may be a gas, and the dispersion unit is a fine bubble generating mechanism that disperses the gas as fine bubbles in the liquid. Preferably there is. According to this configuration, since the liquid passing through the can gap does not include bubbles, the cooling efficiency of the stator and the rotor can be increased, and there is no problem that the efficiency of the can motor is reduced.

  According to the third aspect of the present invention, the dispersion flow path of the dispersion part provided in the second casing exhibits the same effect as the venturi tube, and the bubbles in the gas-liquid mixed fluid are refined in the second casing. be able to. An impeller is provided in the second casing and can pass through the dispersion portion under high pressure conditions, so that microbubbles having a microbubble level can be generated. The specific configuration of the dispersion channel may be an annular slit or a simple pipe.

  According to the fifth aspect of the present invention, the flow path can increase the amount of the first fluid that is supplied into the second casing through the can gap without causing a decrease in the performance of the canned motor pump. The amount of dispersion can be increased. Further, since the first fluid is supplied to the bearing supported by the bearing support portion, the first fluid can be used as a lubricating / cooling liquid.

  According to the sixth aspect of the present invention, the inside of the stator frame through which the rotation shaft is inserted communicates with the inside of the first casing through the through hole provided in the impeller body, and the first fluid is placed in the stator frame. It becomes easy to be supplied. Therefore, the amount of the first fluid supplied to the second casing through the can gap can be increased.

It is sectional drawing which shows the structure of the fluid dispersion pump concerning embodiment of this invention. It is the elements on larger scale of the fluid dispersion | distribution pump of FIG. It is sectional drawing which shows the structure of the dispersion | distribution part used for the fluid dispersion pump of FIG. It is a figure which shows the modification of the dispersion | distribution part used for the fluid dispersion | distribution pump of FIG. It is the elements on larger scale of the fluid dispersion pump concerning the modification of the fluid dispersion pump of FIG.

  Hereinafter, a fluid dispersion pump according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a fluid dispersion pump according to an embodiment of the present invention. In the following, each embodiment describes a gas-liquid dispersion pump that uses liquid as the first fluid and gas as the second fluid and disperses the gas in the form of fine bubbles in the liquid and flows out. The dispersion pump is not limited to the gas-liquid dispersion pump, and includes a pump for dispersing the liquid in the liquid.

  In FIG. 1, a fluid dispersion pump 1 uses a liquid as a first fluid and a gas as a second fluid, rotates an impeller in a casing to flow out both fluids, and disperses the gas supplied into the liquid as fine bubbles. be able to. The fluid dispersion pump 1 includes a canned motor 10, a liquid feeding unit 11, and a fine bubble generating unit 12.

  The canned motor 10 includes a rotor 13 and a stator 24. The rotor 13 includes a rotor core 14 and a rotary shaft 15 that is press-fitted and fixed to the rotor core 14. Sleeves 16 and 17 and thrust collars 18 and 19 are attached to the front and rear portions of the rotary shaft 15, respectively. The rotary shaft 15 is rotatably supported by the front and rear bearings 20 and 21 via the sleeves 16 and 17 and the thrust collars 18 and 19. These bearings 20 and 21 are inserted and fixed in a front bearing box 22 and a rear bearing box 23, respectively.

  The front bearing box 22 is fastened and fixed to the surface of the front flange 26 of the stator frame 25 to which the stator 24 is inserted and fixed. The rear bearing box 23 is fastened and fixed in a liquid-tight manner to the rear end face 29 of the stator frame 25 via a gasket 28.

  The rotor 13 includes a rotor core 14 and is sealed by liquid-tight welding of a non-magnetic thin cylindrical rotor can 31 and a side plate 32. The stator 24 is hermetically sealed in a liquid-tight weld of an end portion of the stator frame 25 and a non-magnetic thin cylindrical stator can 33. The rotor 13 and the stator 24 are disposed to face each other with a can gap 34 interposed therebetween.

  The front casing 35 provided in the liquid feeding section 11 is fastened and fixed in a liquid-tight manner to the front flange 26 via a gasket. The front casing 35 and the front flange 26 as a configuration example of the first casing define a storage chamber 37.

  The front casing 35 is provided with a liquid supply port 38 and a fluid outlet 39. The liquid supply port 38 is provided at the extended position of the rotary shaft 15 of the rotor 13, and the fluid outlet 39 is provided on a surface located in a direction intersecting the rotary shaft 15 of the casing 35.

  A first impeller 40 is stored in the storage chamber 37. The first impeller 40 is fixed to the tip of the rotating shaft 15 of the canned motor 10. As shown in FIG. 1, the 1st impeller 40 is comprised with the closed type centrifugal impeller, and the structure provided with the centrifugal blade 42 for liquid feeding inside the impeller main-body part 41 provided with the disk-shaped impeller rear surface. It has become.

  A through hole 40 a is provided on the rear surface of the impeller main body 41 so as to communicate the front and back surfaces of the rear surface of the impeller. The through holes 40a are for promoting the flow of fluid between the front and back surfaces of the rear surface of the impeller, and the number of installed holes is not particularly limited.

  When the first impeller 40 rotates, the liquid is supplied from the liquid supply port 38 into the storage chamber 37, and the liquid to which the centrifugal force is applied by the rotation of the first impeller 40 flows out from the fluid outlet 39.

  In the storage chamber 37, a part of the liquid supplied from the liquid supply port 38 into the storage chamber 37 through the gap 43 formed between the impeller body 41 of the front bearing box 22 and the first impeller 40 is It is supplied to the partial bearing 20, the can clearance 34, and the rear bearing 21 and functions as a lubricating / cooling liquid for the canned motor 10.

  The front bearing box 22 and the rear bearing box 23 are provided with through holes 22a and 23a, respectively, in order to facilitate fluid flow through the can gap 34. The fluid that has passed through the can gap 34 moves to the rear end side of the rotary shaft 15 and moves to the inside of the rear casing 45.

  The rear casing 45 provided in the fine bubble generating unit 12 is fastened and fixed to the rear bearing box 23 in a liquid-tight manner. The rear casing 45 and the rear bearing box 23 as a configuration example of the second casing define a dispersion chamber 47.

  The rear bearing box 23 constituting a part of the second casing is provided with a gas supply port 48 and a dispersion liquid outlet 49. The gas supply port 48 is provided on a surface located in a direction intersecting the rotation axis 15 of the rotor 13 and supplies gas (air) to the vicinity of the rotation axis 15. Further, the dispersion liquid outlet 49 is provided at an extension position of the rotating shaft 15 of the rear casing 45.

  In addition to the second impeller 50, the dispersion unit 51 is accommodated in the dispersion chamber 47. The second impeller 50 is fixed to the rear end of the rotating shaft 15 of the canned motor 10. As shown in FIG. 1, the second impeller 50 has a configuration in which a centrifugal blade 53 for liquid feeding is provided on the surface of a disc-shaped impeller main body 52.

  The dispersion part 51 provided in the dispersion chamber 47 is fixed to the rear bearing box 23. As shown in FIGS. 2 and 3, the dispersing unit 51 includes a dispersing unit body composed of two fixed disks 56 and 57, and a disk is disposed on the opposing surface of these disks 56 and 57. A dispersion channel 58 is formed over the entire circumference of 56 and 57.

  As shown in FIG. 3, the circular plate 56 is configured to have a different thickness so that the central portion 60 is thin and the outer portion 61 is thick. The boundary between the outer portion and the inner portion is an inclined tapered surface, and the tapered surface functions as a flow path reducing portion 65 described later.

  As shown in FIG. 3, the disk 57 is an annular disk having an opening 62 at the center and a sleeve 64 at the outer edge. The central portion 63 of the disc 57 is configured to be thin, and the outer portion is configured to be thick. The disc 57 has an outer diameter larger than that of the disc 56 and is configured such that the disc 56 can be inserted into an inner portion of the sleeve 64. The inner side surface of the sleeve 64 is a tapered surface formed obliquely, and the tapered surface functions as a flow path expanding portion 67 described later. In addition, the boundary between the outer portion and the inner portion is an inclined tapered surface, and the tapered surface functions as a flow path reducing portion 65 described later.

  The dispersion flow path 58 formed on the facing surface on the side where the two disks 56 and 57 face each other includes a flow path reduction portion 65 configured to gradually reduce the cross-sectional area, and a flow path cut-off. A flow path enlargement portion 67 configured to gradually increase the area, and a gap minimum portion 66 where the gap of the dispersion flow path 58 becomes the smallest at the connection portion between the flow path reduction portion 65 and the flow path enlargement portion 67 are provided. .

  As shown in FIG. 2, the centrifugal blade 53 of the second impeller 50 is located in the thin portion of the disc of the dispersion portion 51. As the second impeller 50 rotates, the liquid supplied into the dispersion chamber 47 through the can gap 34 is pressurized by the rotational centrifugal force of the first impeller 40 and passes through the dispersion flow path 58 of the dispersion unit 51. pass.

  In the dispersion chamber 47, gas and liquid taken in from the gas supply port 48 exist. At this time, as the second impeller 50 rotates, the mixture of the gas and the liquid moves through the flow path reducing section 65 and the flow path expanding section 67 provided in the dispersion flow path 58 of the dispersion section 51 in order. Then, when the mixture of gas and liquid passes through the flow path expansion section 67 via the flow path reduction section 65, the flow rate of the mixture of gas and liquid changes due to the change in the flow path gap, and the pressure changes. A finely divided fine bubble dispersion is produced.

  The refinement of the gas is mainly determined by the flow rate of the liquid, the amount of gas, the gap size of the gap minimum portion 66 and the flow path expanding portion 67, and the like. For example, when the flow rate of the liquid is below a certain threshold value, the bubble diameter is not reduced, and sufficient miniaturization is not performed. In this case, the diameter of the bubbles to be refined can be adjusted mainly by the gap size of the gap minimum portion 66 and the flow path enlargement portion 67. On the other hand, when the flow velocity of the liquid is equal to or higher than the threshold value, the bubble diameter is reduced and sufficient miniaturization is performed. The channel expanding portion 67 provided in the dispersion channel 58 exhibits the same effect as the Venturi tube, and the liquid accompanying the gas passes through the dispersion channel 58 of the dispersion unit 51, thereby miniaturizing the gas. Can do.

  The fine bubble dispersion liquid that has passed through the dispersion flow path 58 moves between the dispersion part 51 and the rear casing 45 and flows out from the dispersion liquid outlet 49. The dispersion outlet 49 communicates with the fluid outlet 39 by the dispersion flow pipe 68, and the fine bubble dispersion is mixed with the liquid and flows out.

  Next, the operation of the fluid dispersion pump 1 will be described with reference to FIGS. Hereinafter, the fluid supplied from the liquid supply port 38 will be described as liquid, and the fluid supplied from the gas supply port 48 and dispersed in the liquid at the dispersion unit will be described as air.

  As a premise of the operation of the canned motor 10, it is necessary that the storage chamber 37 and the dispersion chamber 47 are filled with fluid. At this time, the air present in the fluid dispersion pump 1 is extracted from the air vent unit 69 and the fluid dispersion pump 1 is filled with liquid.

  When the rotating shaft 15 of the canned motor 10 rotates, the first impeller 40 and the second impeller 50 also rotate together, and the liquid is taken into the storage chamber 37 from the liquid supply port 38. As the first impeller 40 rotates, the liquid is sent in the centrifugal direction from the rotating shaft, and a part flows out from the fluid outlet 39.

  A part of the fluid that has not flowed out from the fluid outlet 39 is supplied to the front bearing 20, the can gap 34, and the rear bearing 21 and functions as a lubricating / cooling liquid for the canned motor 10. The fluid moves through the through hole 22a provided in the front bearing box 22 and into the stator frame on the rear end side of the rotary shaft 15, and the through hole 23a of the rear bearing box 23, the bearing 21 and the sleeve 17 are moved. And move into the dispersion chamber 47.

  The second impeller 50 provided in the dispersion chamber 47 moves the gas-liquid dispersion fluid in the dispersion chamber 47 in the centrifugal direction from the rotating shaft 15 side. As described above, since the gas supplied from the gas supply port 48 and the liquid moved through the can gap 34 are mixed in the dispersion chamber 47, the dispersion chamber 51 passes through the dispersion portion 51 by the rotation of the second impeller. Bubbles are refined.

  The fine bubble dispersion liquid that has passed through the dispersion flow path 58 moves between the dispersion part 51 and the rear casing 45 and flows out from the dispersion liquid outlet 49. The dispersion outlet 49 communicates with the fluid outlet 39 by the dispersion flow pipe 68, and the fine bubble dispersion is mixed with the liquid and flows out.

  The fluid dispersion pump according to the present embodiment is provided in the dispersion chamber 47 by causing the first impeller 40 to cause the liquid to flow out in the storage chamber 37 and passing through the can gap 34 using a part of the liquid as lubricating / cooling liquid. The second impeller 50 and the dispersion part 51 have a mechanism for generating fine bubbles. For this reason, bubbles are not included in the liquid as the lubricating / cooling liquid of the canned motor 10, and the cooling efficiency of the rotor and the stator is excellent. In addition, since the storage chamber 37 and the dispersion chamber 47 are independent of each other, the efficiency of the pumping function for fluid transfer and the efficiency of the fine bubble generation function can be improved, and the fine bubble dispersion can be efficiently generated.

  Even in the dispersion portion having the configuration shown in FIG. 4, the flow channel expanding portion 67 provided in the dispersion flow channel 58 exhibits the same effect as the Venturi tube, and the liquid accompanied by the gas is the dispersion flow channel 58 of the dispersion portion 51. The gas can be refined by passing through the inside.

  As described above, according to the dispersion pump according to the embodiment of the present invention, the second impeller for refining the air bubbles is provided coaxially with the centrifugal blade of the pump having the fluid conveyance function, and is configured separately from the storage chamber. The gas dispersed in the fluid can be refined and dispersed by the dispersion part provided in the dispersion chamber. In addition, since the refined bubbles can be returned to the front side region and allowed to flow out from the fluid outlet, the fine bubble dispersion can be efficiently generated only by the dispersion pump according to the present embodiment, and the fine bubbles can be dispersed. Dispersed fluid can be discharged.

  The size of the bubbles dispersed by the dispersion unit is determined by the flow rate of the liquid, the amount of gas, the configuration of the dispersion unit, and the like, and can be miniaturized to the microbubble level.

  In addition, this invention is not limited to the said embodiment, It can implement in another various aspect. For example, the configuration of the dispersion unit is not the one shown in FIG. 1. For example, as shown in FIG. 5, the dispersion channel having a channel reduction unit, a channel expansion unit, and a gap minimum unit that function as a Venturi tube Can be widely used. Further, the dispersion flow path is not limited to the slit formed between the two disks, and may be configured by a pipe line or the like.

  The dispersion pump according to the present invention can be suitably used in various plants such as a chemical plant because two fluids, in particular, gas can be refined to the level of fine bubbles, dispersed in a liquid, and further discharged. be able to.

DESCRIPTION OF SYMBOLS 1 Fluid dispersion | distribution pump 10 Canned motor 11 Liquid supply part 12 Fine bubble generation | occurrence | production part 13 Rotor 14 Rotor core 15 Rotating shaft 16, 17 Sleeve 18, 19 Thrust collar 20, 21 Bearing 22 Front bearing box 23 Rear bearing box 22a, 23a Through hole 24 Stator 25 Stator frame 26 Front flange 28 Gasket 29 Rear end face 31 Rotor can 32 Side plate 33 Stator can 34 Can clearance 35 Front casing 37 Storage chamber 38 Liquid supply port 39 Fluid outlet 40 First Impeller 40a Through hole 41 Impeller main body 42 Centrifugal blade 43 Clearance 45 Rear casing 47 Dispersion chamber 48 Gas supply port 49 Dispersion liquid outlet 50 Second impeller 51 Dispersion unit 53 Centrifugal blades 56 and 57 Disc 58 Dispersion channel 65 Channel Reduction part 66 Minimum gap part 67 Flow path enlargement part

Claims (7)

A stator frame containing a cylindrical stator;
A rotor inserted into the stator frame having a rotation shaft connected to the first impeller and the second impeller on both ends, respectively;
A first casing fixed to the stator frame so as to accommodate the first impeller and the rotating shaft, and having a first fluid supply port and a first fluid outlet;
A second casing fixed to the stator frame so as to accommodate the second impeller and the rotating shaft, and having a second fluid supply port and a second fluid outlet;
A part of the first fluid provided in the second casing and supplied from the second fluid supply port through the can gap in the stator frame and the second fluid supplied from the second fluid supply port. A dispersion unit to be dispersed;
A fluid dispersion pump comprising:   2. The fluid dispersion pump according to claim 1, wherein the first fluid is a liquid, the second fluid is a gas, and the dispersion unit is a fine bubble generating mechanism that disperses the gas as fine bubbles in the liquid. The dispersion unit is
A dispersion unit body configured in an annular shape;
A flow path reducing portion configured to gradually reduce a cross-sectional area; a flow path expanding portion configured to gradually increase a cross-sectional area of the flow path; and the flow path reducing portion and the flow path expanding portion. The fluid dispersion pump according to claim 2, further comprising a dispersion flow path having a minimum gap portion at a boundary portion between the fluid dispersion pump and the fluid.   The fluid dispersion pump according to claim 3, wherein the dispersion flow path is configured as an annular slit provided in an annular shape in the dispersion portion main body. A bearing provided in the stator frame for supporting the rotor in the stator frame;
A bearing support for holding the bearing;
The flow path which connects the inside of the said 1st casing and 2nd casing, and the said stator frame is provided in the said bearing support part, The any one of Claim 1 to 4 characterized by the above-mentioned. Fluid dispersion pump. The first impeller includes a disc-shaped impeller main body and a centrifugal blade that sends out the first fluid,
The fluid dispersion pump according to any one of claims 1 to 5, wherein the impeller main body includes a through hole that communicates the front and back sides of the impeller main body.   The fluid dispersion pump according to any one of claims 1 to 6, wherein the second fluid outlet is in communication with a dispersion flow pipe that is in communication with the first fluid outlet.

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