This invention relates to a fluid mixer used for fluid transport piping in a variety of industries such as chemical plants or in the field of semiconductor production, in the field of foods, in the field of medicine, in the field of biotechnology, etc. Specifically, the invention relates to an in-line-type fluid mixer capable of mixing and homogeneously stirring a plurality of fluids in a pipeline.
In order to mix a plurality of fluids together in-line, there has heretofore been employed a method by making use of a Venturi tube which, as shown in
In the above fluid mixer, however, the fluid to be sucked joins the flow from a direction deviated in the circumferential direction from the suction channel 102 communicated with the inner circumference of the throat portion 105. Therefore, the fluids tend to be inhomogeneously mixed together in the channel. In order to avoid inhomogeneous mixing and to more homogeneously mix and stir the fluids, it is necessary to install a stationary mixer or the like in the downstream of the in-line fluid mixer. To solve the above problem, a liquid mixer using a jet nozzle as shown in
By using the above ejector 109, the chemical solution flowing in from the introduction communication passage 115 is mixed into the raw water from the entire circumferential directions along an outer wall 116 of the nozzle member 111. Therefore, the chemical solution can be mixed more homogeneously than when it is mixed by the mixing method using the conventional Venturi tube.
In the above-mentioned conventional liquid mixer, however, the flow of the chemical solution flowing in through the introduction communication passage 115 tends to deviate to the negative pressure-generating space 113 through a path forming the shortest route in the outer circumference of the outer wall 116 of the nozzle member 111. Namely, the chemical solution tends not to flow into the negative pressure-generating space 113 from the lower side in
It is, on the other hand, possible to enhance the mixing effect by further decreasing the sectional area of the jet 112 of the nozzle member 111 and increasing the velocity of raw water injection. However, as the velocity of flow of the raw water reaches a predetermined value, cavitation may occur, causing damages to the inner wall of the pipe in the downstream of the ejector 109.
The object of the present invention is to provide an in-line-type fluid mixer which is capable of homogeneously mixing a plurality of fluids together and of preventing the inner wall of the pipe from being damaged even in the conditions where the cavitation may occur.
In order to achieve the above object according to the present invention, an in-line-type fluid mixer is provided, the fluid mixer comprising: a first channel-forming part having a first inlet portion and a first passage portion extending in a lengthwise direction, the first channel-forming part defining a first inlet channel from the first inlet portion and over the first passage portion; a second channel-forming part having a second inlet portion and a second passage portion extending along a tapered surface that surrounds a periphery of the first passage portion, the second channel-forming part defining a second inlet channel from the second inlet portion and over the second passage portion; a third channel-forming part having a narrower portion, a flaring portion and an outlet portion, the third channel-forming part defining an outlet channel having a sectional area that increases from the narrower portion through the flaring portion to the outlet portion and being communicated with the first inlet channel and the second inlet channel, respectively, at an end of the narrower portion; and a whirling stream-generating part for generating a whirling stream in at least one of the first inlet channel and the second inlet channel.
a is a lengthwise sectional view showing a main body of an in-line-type fluid mixer according to a third embodiment of the invention;
b is a view showing a modified example of
a is a sectional view showing an in-line-type fluid mixer according to a fifth embodiment of the invention;
b is a perspective view showing the nozzle of
An in-line-type fluid mixer according to a first embodiment of the invention will be described below with reference to
The main body 1 is provided, in its one end surface, with a receiving portion 6 into which the nozzle member 2 is fitted and is provided, in its other end surface, with an outlet port 22 that forms an outlet channel 5. The receiving portion 6 has an internally threaded portion 11 formed in the inner circumferential surface thereof at the side of the port. The receiving portion 6 has an circular ring groove portion 10 formed on the bottom surface 23 thereof, and the outer circumferential surface of the circular ring groove portion 10 is positioned substantially on line extending from the internally threaded portion 11. The main body 1 includes, in the inside thereof, a contracting portion 7 formed at the center of the bottom surface of the receiving portion 6 and decreasing in diameter into a circular truncated cone shape toward the outlet port 22, a throat portion (narrower portion) 8 continuously provided to the contracting portion 7 and forming a cylindrical surface, and a flaring portion 9 continuously provided to the throat portion 8 and increasing in diameter into a circular truncated cone shape toward the outlet port 22, all of which are concentric with the central axis (a central axis of a cylinder) of the main body 1. By the contracting portion 7, the throat portion 8 and the flaring portion 9, the outlet channel 5 is defined for producing a Venturi effect from the contracting portion 7 to the outlet port 22. A channel is formed by a cylindrical surface from the end of the flaring portion 9 to the outlet port 22.
As shown in
The externally threaded portion 15 of the nozzle member 2 is screwed into the internally threaded portion 11 of the receiving portion 6 of the main body 1 in a sealing manner until the end surface 24 of the cylindrical portion 13 comes in contact with the bottom surface 23 of the receiving portion 6 of the main body 1 and, thus, the nozzle member 2 is fitted into the receiving portion 6 of the main body 1. In this state, the protruding portion (convex portion) 14 is accommodated in the contracting portion (concave portion) 7 of the main body 1, and a communication channel 18 is formed by the groove portions 12 formed on the bottom surface 23 of the receiving portion 6 of the main body 1 and by the end surface 24 of the nozzle member 2 at the side of the protruding portion 14. Further, a clearance is maintained between the inner circumferential surface (tapered surface) of the contracting portion 7 of the main body 1 and the outer circumferential surface (tapered surface) of the protruding portion 14 of the nozzle member 2, and an annular channel 19 is formed by the clearance so as to extend along these tapered surfaces.
Thus, there is a second inlet channel 4 that is communicated with the throat portion 8 of the main body 1 from the second inlet port 21 through the circular ring groove portion 10, the communication channel 18 and the annular channel 19, and becomes narrower at the outlet side. The bottom surface 23 of the receiving portion 6 of the main body 1 may not be in contact with the end surface 24 of the nozzle member 2 at the side of the protruding portion 14, thereby forming a suitable clearance between them. When the clearance is maintained, the communication channel 18 is defined by the clearance and by the groove portions 12 to communicate the circular ring groove portion 10 and the annular channel 19 with each other.
The shape of the groove portions 12 is not limited to the one shown in
Namely, the groove portions 12b may be formed along a straight line extending outward in the radial direction without intersecting the central axis of the channel in the nozzle member 2. Therefore, the shape of the groove portion 12 is not limited to any particular shape, provided that it is in communication tangentially in relation to the circumference of the circumferential edge of the contracting portion 7 so as to generate a whirling stream. The sectional shape and the number of the groove portion 12 is not limited to any particular sectional shape or any particular number of the groove portions 12, either.
The material of the main body 1 and the nozzle member 2 is not limited to any particular material, provided that the material does not erode under influence of the fluids that are used. Any material such as polyvinyl chloride, polypropylene, and polyethylene may be used. If corrosive fluids are used, it is preferable to use a fluorine-containing resin such as polytetrafluoroethylene, polyvinylidene fluoride, and tetrafluoroethylene/perfluoroalkylvinyl ether copolymer resin. The fluorine-containing resin is preferable, since it can be used with corrosive fluids and, in addition, there is no risk of the piping member eroding in the case where corrosive gases flow therethrough. The material constituting the main body 1 or the nozzle member 2 may be transparent or semitransparent. This is preferable since the state of the fluids being mixed together can be visually observed. Depending upon a substance flowing to the fluid mixer, the materials of each part may be a metal such as iron, copper, copper alloy, brass, aluminum, stainless steel or titanium, or alloys thereof. In particular, if the fluid is a food product, it is preferable to use stainless steel which is sanitary and has a long life. The main body and the nozzle can be assembled together by any method that maintains sealing of the inner fluids, such as screwing, welding, melt-adhesion, adhesion, anchoring by pin or fitting. Pipes (not shown) are connected to the first inlet port 20, the second inlet port 21 and the outlet port 22, respectively, in order to introduce and discharge the fluids. However, the connecting manner is not limited to any particular manner.
An operation of the first embodiment of the invention will be described below. In the in-line-type fluid mixer according to the first embodiment of the invention, there are options either to suck a secondary fluid from the second inlet port 21 by the negative pressure, which is generated, as a primary fluid is introduced from the first inlet port 20 or to suck the secondary fluid from the first inlet port 20 by the negative pressure, which is generated in the narrowing channel, as the primary fluid is introduced from the second inlet port 21.
First, the option to introduce the primary fluid from the second inlet port 21, which results in more effective mixing of the two fluids together, will be described below.
In
The primary fluid flowing from the second inlet port 21 into the throat portion 8 through the annular channel 19 further flows through the contracting portion 7 which is the narrowing channel, the throat portion 8 and the flaring portion 9 successively, and, as a result, a negative pressure is generated in the throat portion 8 due to the Venturi effect. As the negative pressure is generated in the throat portion 8, the secondary fluid is sucked into the throat portion 8 via the first inlet port 20 and the first inlet channel 3 of the nozzle member 2 and the discharge port 16 at a tip of the protruding portion 14, and joins the primary fluid at the throat portion 8. The primary fluid in a whirling stream flows into the throat portion 8 through the annular channel 19 over the entire circumference thereof without deviation. Due to a stirring effect of the primary fluid in a whirling stream, the primary fluid and the secondary fluid are mixed together evenly and homogeneously.
As the velocity of flow of the mixed fluid increases, cavitation occurs when the fluid flows from the throat portion 8 to the flaring portion 9. In this embodiment, however, the primary fluid flowing from the annular channel 19 into the throat portion 8 flows in a whirling stream along the inner circumferential surface of the flaring portion 9. Therefore, air bubbles produced due to the cavitation are gathered near the axis of the pipe channel. Accordingly, the pipe walls are prevented from being damaged by the cavitation. In addition, due to the cavitation, the primary fluid and the secondary fluid are further stirred and mixed together even more evenly and homogeneously.
In general, a static pressure of a fluid decreases with an increase in the velocity of flow of the fluid flowing in a piping. However, in the case of the fluids flowing through the pipe, there is an additional flow of a whirling stream. Therefore, an absolute velocity of the flow increases more than that of an ordinary axial flow, even when the flow rate remains unchanged, and the static pressure decreases more. Therefore, in the case where the secondary fluid introduced via the first inlet channel 3 is sucked by generating a negative pressure in the narrowing channel by the primary fluid flowing into the throat portion 8 from the annular channel 19 as in this embodiment, the more secondary fluid can be sucked from the first inlet channel 3 by the greater negative pressure resulting from the whirling stream. This increases a capacity of sucking the secondary fluid and widens an adjustable range of the mixing ratio between the primary fluid and the secondary fluid. With the whirling stream generated as described above, the in-line-type fluid mixer capable of adjusting the mixing ratio within a wider range can be provided.
Test results of flow rate-measuring will be described in the case where the primary fluid in a whirling stream flows in from the annular channel 19 (Example 1) and in the case where the primary fluid in a non-whirling stream flows in (Comparative Example 1). The throat portion 8 of the in-line-type fluid mixer used in the flow rate-measuring tests has an inner diameter of 6 mm, and the discharge port 16 of the nozzle member 2 has an inner diameter of 3 mm. The primary fluid (water) was introduced by a pump into the second inlet port 21 of the apparatus used for the tests, and the secondary fluid (water) was introduced into the first inlet port 20 without using a pressurized feeding part. Flow rates were measured by means of flow meters installed near the ports 20 and 21.
In Example 1, an apparatus was configured such that the groove portions 12 of the main body 1 were formed in a radially curved manner as shown in
In Comparative Example 1, the apparatus is configured such that the groove portions 25 of the main body 1 were radially formed from the central axis as shown in
Next, the case where the primary fluid is introduced from the first inlet port 20 will be described.
The primary fluid introduced by the pressurized feeding part such as a pump from the first inlet port 20 flows through the first inlet channel 3. Namely, the primary fluid flows into the throat portion 8 from the discharge port 16 via the tapered portion 17. The channel becomes narrower at the tapered portion 17, and thus, the velocity of flow of the primary fluid increases. The primary fluid flowing at an increased velocity flows from the discharge port 16 into the throat portion 8, producing a negative pressure in the throat portion 8. Due to the negative pressure generated in the throat portion 8, the secondary fluid is sucked from the second inlet port 21 through the annular channel 19. The sucked secondary fluid flows in a whirling stream, as it passes through the radially curved communication channel 18, and flows into the throat portion 8. The effect of mixing the primary fluid and the secondary fluid together is the same as in the case of the primary fluid introduced from the second inlet port 21, and thus, will not be described.
According to the in-line-type fluid mixer of the embodiment described above, the secondary fluid can be sucked in due to the negative pressure generated in the throat portion 8 either in the case where the primary fluid is introduced from the first inlet port 20 or in the case where the primary fluid is introduced from the second inlet port 21. Therefore, there is no need to provide a pressurized feeding part such as a pump at the side of the channel through which the secondary fluid flows, and the number of parts can be reduced. In addition, the stirring effect can be achieved by generating the whirling stream, and more secondary fluid can be sucked in.
In the above embodiment, the primary fluid is introduced either from the first inlet port 20 or the second inlet port 21, generating a negative pressure in the channel so as to suck the secondary fluid from either of the other inlet channel. However, it may also be possible to introduce the secondary fluid into the in-line-type fluid mixer with the aid of a pressurized feeding part such as a pump. In this case, a favorable effect of mixing the fluids can be achieved, even when the discharge pressure of the pressurized feeding part is low. Also in this case, the stirring effect by the whirling stream and the effect of preventing the inner walls of pipes from being damaged due to the cavitation can be achieved.
In the above embodiment, the protruding portion 14 of the nozzle member 2 has a circular truncated cone shape, but may also have a cylindrical shape. It is preferable that the protruding portion 14 has a length which is substantially equal to or slightly shorter than the length of the contracting portion 7 in the axial direction. It is preferable that the discharge port 16 of the nozzle member 2 has an inner diameter smaller than the inner diameter of the throat portion 8 of the main body 1 and that a ratio a of the inner diameter of the discharge port 16 in relation to the inner diameter of the throat portion 8 is within a range of 0.5 to 0.9, for example. That is, in order to enhance the mixing of fluids at the throat portion 8 by decreasing the inner diameter of the discharge port 16 so to be smaller than the inner diameter of the throat portion 8, it is preferable that the fluid flows from the discharge port 16 into the throat portion 8 at an increased velocity and that the ratio a is 0.9 or smaller. In addition, in order to maintain the flow rate of the fluid flowing through the discharge port 16, it is preferable that a is 0.5 or greater. On the other hand, it is preferable that the outer diameter on the circumferential edge of the end surface of the protruding portion 14 at the side of the outlet port 22 is slightly smaller than the inner diameter of the throat portion 8, and that the ratio β of the outer diameter in relation to the inner diameter of the throat portion 8 is within a range of 0.7 to 0.95.
Thus, in order to facilitate the whirling stream flowing from the annular channel 19 into the throat portion 8 along the inner circumferential surface of the throat portion 8 by decreasing the outer diameter of the circumferential edge portion so as to be smaller than the inner diameter of the throat portion 8, it is preferable that β is 0.7 or greater. Further, in order to form the annular channel 19 by maintaining a clearance relative to the inner circumferential surface of the contracting portion 7, it is preferable that β is 0.95 or smaller. Different types of the fluids to be mixed together by the in-line-type fluid mixer may be different fluids of different phases such as gas and liquid, etc., fluids having different temperature, different concentration or different viscosity, or different fluids of different substances. For instance, the invention may be even applied to a case where the one of the fluids is liquid and the other is gas, and the gas is mixed into and dissolved in the liquid. In this case, if the fluid is introduced from one channel into the fluid mixer under a condition where the cavitation occurs, the gas dissolved in the liquid turns into bubbles due to the cavitation phenomenon and is deaerated from the liquid, allowing other gas (e.g., ozone gas) introduced from the other channel to be effectively dissolved in the liquid.
A second embodiment of the invention will be described with reference to
Referring to
The groove portions 26 are not limited to the radially curved ones as shown in
By providing the nozzle member 2 with the groove portions 26 according to this embodiment, the groove portions 26 can be easily cleaned when disassembled. Further, the nozzle member 2 can be replaced with other nozzle member 2 having groove portions 26 of a different configuration, facilitating modification of the conditions for introducing the primary fluid or for sucking the secondary fluid.
A third embodiment of the invention will be described with reference to
Referring to
An operation of the third embodiment will be described next. The primary fluid that has flown from the second inlet port 21 into the annular channel 19 through the communication channel 18 flows through the annular channel having a spiral shape formed by the spiral groove portion 28 into the throat portion 8 while whirling in the annular channel 19. The primary fluid that has flown into the throat portion 8 passes through the flaring portion 9 in the outlet channel 5 in a whirling manner, and flows toward the outlet port 22. The other operations of this embodiment are the same as those of the first embodiment and thus, the description thereon is omitted.
The number and the sectional shape of the spiral groove portions 28 are not limited to any particular type. The inner circumferential surface of the contracting portion 7 and the outer circumferential surface of the protruding portion 14 of the nozzle member 2 may be in contact with each other, or a suitable clearance may be maintained between them. By bringing the inner circumferential surface of the contracting portion 7 and the outer circumferential surface of the protruding portion 14 into contact with each other, the channel axis of the contracting portion 7 and that of the protruding portion 14 can be brought into alignment. The alignment between the channel axis of the contracting portion 7 and that of the protruding portion 14 is important particularly in the case where the channels have small diameters. By adjusting the clearance between the inner circumferential surface of the contracting portion 7 and the outer circumferential surface of the protruding portion 14, the conditions for introducing the primary fluid or for sucking the secondary fluid can be modified.
As shown in
A fourth embodiment of the invention will be described with reference to
As shown in
A fifth embodiment of the invention will be described with reference to
Referring to
The channel portion 36 has a smaller-diameter portion 36a having a substantially cylindrical outer shape at one end side thereof, and a larger-diameter portion 36b having a substantially cylindrical outer shape at the other end side thereof and having a diameter larger than that of the smaller-diameter portion 36a. An externally threaded portion 35a is formed on the outer circumferential surface of the larger-diameter portion 36b at an end thereof. The externally threaded portion 35a is screwed into the internally threaded portion 33 of the casing portion 34, and the channel portion 36 is fitted to the casing portion 34. In the fitted state, the circular ring groove portion 10 is formed between the casing portion 34 and the smaller-diameter portion 36a. The circular ring groove portion 10 is communicated with the channel in the connecting portion 32a. In the interior of the channel portion 34, the contracting portion 7, the throat portion 8 and the flaring portion 9 are provided in a continuing manner and the outlet channel 5 is also formed.
Between the cylindrical portion 13 and the protruding portion 14, the nozzle member 2 has the intermediate portion 31 having a substantially cylindrical outer shape concentric with the central axis of the nozzle member 2. The outer diameter of the intermediate portion 31 is smaller than the outer diameter of the cylindrical portion 13 and the outer diameter of the protruding portion 14, which are adjacent to the intermediate portion 31. A recess is formed by the intermediate portion 31 on the outer circumferential surface of the nozzle member 2. As shown in
In the fitted state, the outer circumferential surface of the spiral groove portions 29a of the protruding portion 14 come in contact with the inner circumferential surface of the contracting portion 7 of the channel portion 36. The annular channel 19 consisting of the whirling portion 37 and the flat portion 38 is formed in the peripheries of the spiral groove portion 29a and the conical surface 29b, respectively. In the periphery of the intermediate portion 31, the communication channel 18 is formed by the upstream end surface of the channel portion 36, the downstream end surface of the cylindrical portion 13, the outer circumferential surface of the intermediate portion 31 and by the upstream end surface of the protruding portion 14. In this way, the second inlet channel 4 is formed so as to be communicated with the throat portion 8 from the second inlet port 21 through the circular ring groove portion 10, the communication channel 18 and the annular channel 19. With such a configuration, the primary fluid that has been introduced via the second inlet port 21 flows through the communication channel 18, and flows into the whirling portion 37 from the upstream end surface of the protruding portion 14. The primary fluid that has flown into the whirling portion 37 turns into a whirling stream and, thereafter, flows through the flat portion 38 and uniformly flows into the throat portion 8 from the entire circumference of the annular channel 19.
In this embodiment, it is preferable that the flat portion 37 of the annular channel 19 has substantially the same sectional channel area both at the upstream side and the downstream side thereof. This allows a preferable flow to be maintained, since the flow of the primary fluid is prevented from changing in its velocity, flow rates, or whirling stream, as the primary fluid flows through the flat portion 37. Therefore, the secondary fluid can be stably and efficiently sucked into the throat portion 8 by the primary fluid flowing from the second inlet channel 4.
In this embodiment, it is preferable that the downstream end surface of the protruding portion 14 and the downstream edge portion of the contracting portion 8 (i.e., connecting portion between the contracting portion 7 and the throat portion 8) are positioned on the same plane perpendicular to the central axis of the nozzle member 2, or that the end surface of the protruding portion 14 is positioned slightly in the upstream of the edge portion of the contracting portion 7. Namely, it is desired that the downstream edge portion of the concave portion (i.e., the contracting portion 7) and the downstream end surface of the convex portion (i.e., the protruding portion 14) are provided substantially on the same plane. In this case, it is conceivable that cavitation occurs in the vicinity of the outlet of the annular channel 19 due to the increasing sectional area of the channel, when the primary fluid flows through the annular channel 19. With the primary fluid and the secondary fluid being mixed at points where the cavitation tends to occur, the primary fluid and the secondary fluid can be mixed together more homogeneously.
Concerning the relationship between the position of the downstream edge portion of the contracting portion 7 and the position of the downstream end surface of the protruding portion 14, even in the case where it is intended to position them on the same plane, the position of the end surface of the protruding portion 14 might deviate in the upstream or the downstream of the edge portion of the contracting portion 7 due to dimensional tolerance of the parts or due to errors in the assembling. Even in case where the end surface of the protruding portion 14 and the edge portion of the contracting portion 7 are not exactly on the same plane, but either one deviates in the upstream or downstream of the other, it should be understood that they are substantially on the same plane, and thus, such a case is also referred to as being on the same plane in this specification. Namely, the same plane is not limited to exactly the same plane, but also includes substantially the same plane.
In this embodiment, the main body 1 is configured by the casing portion 34 and the channel portion 36, and the channel portion 36 and the nozzle member 2 are screwed into the casing portion 34. Such a configuration facilitates an easy modification of the shapes of the communication channel 18 or the annular channel 19, and allows the flow of the primary fluid and the secondary fluid to be changed as necessary. The other configurations and operations of this embodiment are the same as those of the fourth embodiment, and thus, the description thereon is omitted. The whirling portion 37 and the flat portion 38 may be provided at the contracting portion 7 instead of the protruding portion 14.
A sixth embodiment of the invention will be described with reference to
Next, an operation of the sixth embodiment will be described. In
In contrast, in the case where the primary fluid is introduced from the second inlet port 21 by means of the pressurized feeding part such as a pump, the primary fluid that flows from the second inlet port 21 into the throat portion 8 through the annular channel 19 flows through the contracting portion 7 which is the contracting channel, the throat portion 8 and the flaring portion 9, so as to generate a negative pressure due to the Venturi effect. In this manner, the secondary fluid is sucked into the first inlet channel 3 from the first inlet port 20 through the discharge port 16 provided at the tip of the protruding portion of the nozzle member 2. The sucked secondary fluid turns into a whirling stream as it passes through the whirler 30, and flows into the throat portion 8. The action of mixing the primary fluid and the secondary fluid together is the same as in the case where the primary fluid is introduced from the first inlet port 20, and thus, the description thereon is omitted.
In the above first to fifth embodiments, the fluid flowing in from the second inlet port 21 turns into a whirling stream, and in the above sixth embodiment, the fluid flowing in from the first inlet port 20 turns into a whirling stream. However, both of the fluids flowing in from the first inlet port 20 and from the second inlet port 21 may turn into a whirling stream. Namely, an in-line-type fluid mixer may be configured by any combination of the first to sixth embodiments. In the case where the fluids flowing in from the first inlet port 20 and the second inlet port 21 both turn into a whirling stream, the whirling stream flowing into the throat portion 8 from the discharge port 16 and the whirling stream flowing into the throat portion 8 from the annular channel 19 interfere with each other so as to provide mixing by an increased stirring effect. In order to further increase the stirring effect, it is preferable that the respective whirling streams whirl in the directions opposite to each other.
In the above embodiments, the first inlet port 20 (first inlet portion) is formed in the nozzle body 2, and the tapered portion 17 and the discharge port 16 (first passage portion) are provided so as to extend in a lengthwise direction, so that the first inlet channel 3 extends from the first inlet port 20 to the discharge port 16. However, the configuration of the first channel-forming part is not limited to the above-mentioned one. The second inlet port 21 (second inlet portion) is formed in the main body 1, and the communication channel 18 and the annular channel 19 are formed on the opposed surfaces (second passage portion) of the main body 1 and the nozzle member 9, so that the second inlet channel 4 extend from the second inlet port 21 to the annular channel 19. However, the configuration of the second channel-forming part is not limited to the above-mentioned one, provided that the passage is formed at least along the tapering surface which surrounds the circumference of the discharge port 16. The contracting portion 7, the throat portion 8 (narrower portion), the flaring portion 9 and the outlet port 22 (outlet portion) are formed in the main body 1, so that the outlet channel 5 extends from the contracting portion 7 to the outlet port 22. However, the third channel-forming part is not limited to the above-mentioned one. Namely, although the first inlet channel 3, the second inlet channel 4 and the outlet channel 5 are formed by the main body 1 and the nozzle member 2, these channels 3 to 5 may also be formed by other members. The contracting portion 7 contracting in a tapered manner is formed in the main body 1, the protruding portion 14 protruding in a tapered manner is formed on the nozzle member 2, and these two are fitted with each other. However, the configurations of the main body 1 and the nozzle member 2 are not limited to the above-mentioned ones.
In the above embodiments, a plurality of groove portions 12, 25 to 29, 12b and 26b are formed on the opposed surfaces of the main body 1 and the nozzle member 2 in the circumferential direction, or the whirler 30 is provided in the first inlet channel 3 of the nozzle member 2 in order to generate a whirling stream. However, a whirling stream-generating part is not limited to the above-mentioned types. The groove portions may be provided on both of the inner circumferential surface of the contracting portion 7 (concave portion) of the main body 1 and the outer circumferential surface of the protruding portion 14 (convex portion) of the nozzle member 2, and a plurality of groove portions may be provided on both of the end surface 23 of the main body 1 and the end surface 24 of the nozzle member 2. Further, a plurality of groove portions may be formed on both of the inner circumferential surface of the contracting portion 7 and the outer circumferential surface of the protruding portion 14, and on both of the end surfaces 23 and 24. Namely, the present invention is not limited to the in-line-type fluid mixers according to the embodiments, provided that the features and functions of the invention can be realized.
According to the in-line-type fluid mixer of the present invention, the following effects are provided.
(1) Since the fluid introduced through either the first inlet channel or the second inlet channel turns into a whirling stream, the fluids that have joined together are effectively mixed and stirred. Therefore, there is no need to provide a separate stationary mixer in the downstream side, and the configuration of a compact size and at low cost can be realized.
(2) The whirling stream flows along the inner wall surface of the Venturi tube and the inner wall of piping in the downstream side of the Venturi tube. The flow serves as a protection layer under a condition where cavitation occurs and, at the same time, bubbles produced by the cavitation phenomenon are gathered to the vicinity of the center of the piping. Therefore, the inner wall of the piping is prevented from being damaged.
Number | Date | Country | Kind |
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2010-037593 | Feb 2010 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2011/054428 | 2/22/2011 | WO | 00 | 8/16/2012 |