Static mixer for fluids and method of mixing fluids

Abstract

Provided is a static mixer for fluids that can more efficiently mix and activate fluids such as combustible gas and air used in a torch for crimping or the like. 【Means for solving the problem】 The static mixer A4 for fluids includes a pipe body 1 provided with a linear internal space 4 having a fluid supply pipe 90a and a discharge pipe 90b at both ends in the length direction, and is housed in the internal space 4 of the pipe body 1b. Spiral blades 30a and 30b are provided on the outer peripheral surface 39 from the supply pipe 90a toward the discharge pipe 90b, and a guide body 3b provided with a gap 400 of a predetermined size between the tip portions of the spiral blades 30a and 30b and the inner peripheral surface 19 forming the internal space 4 of the pipe body 1b.

Description

Technical Field

[0001] The present invention relates to a static mixer for fluids and a method for mixing fluids. More specifically, the present invention relates to a static mixer for fluids and a method for mixing fluids that can more efficiently mix and activate fluids such as combustible gas and air, for example, those used in torches for pressure welding.

Background Art

[0002] By mixing a plurality of different types of gases or stirring a single gas to activate the gas, for example, if the gas contains a combustible gas, the combustion efficiency can be improved or the combustion temperature can be increased. As a gas mixer used in this case, for example, there is a mixing element disclosed in Patent Document 1.

[0003] The conventional mixing element of Patent Document 1 has a plurality of fan-shaped and spiral blade bodies made of a perforated plate having an edge portion in a cylindrical passage pipe through which a fluid flows. The blade bodies are arranged at intervals from each other, and an opening is formed at the center of the passage pipe over the entire axial length of the passage pipe. The edge portion of the blade body has substantially the same shape as the edge portion of the blade body, and the edge portion of the blade body is arranged in the perforated portion of the passage pipe so as to penetrate the pipe wall portion of the passage pipe at equal intervals in the lateral direction with respect to the axial direction of the passage pipe and be parallel to each other.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the description of this mixing element, it is claimed that it has a simple structure, is easy to manufacture, can reduce the manufacturing cost, and has high performance. However, in terms of practical performance, due to the extremely large fluid resistance caused by the perforated plate structurally, it is difficult to generate the fluid velocity, and efficient mixing cannot be achieved, resulting in the problem of insufficient activation.

[0006] In view of the above points, the present invention was conceived, and an object thereof is to provide a stationary mixer for fluids and a method for mixing fluids that can more efficiently mix and activate fluids such as combustible gas and air used in a torch for pressure welding or the like.

Means for Solving the Problems

[0007] 〔1〕To achieve the above object, the present invention provides a stationary mixer for fluids, comprising: a tubular body provided with a linear internal space having a fluid supply part and a discharge part at both ends in the longitudinal direction; and a guiding body accommodated in the internal space of the tubular body, having a flow passage penetrating in the longitudinal direction, and a gap of a predetermined size is provided between the outer peripheral part and the inner peripheral part forming the internal space of the tubular body.

[0008] In the stationary mixer for fluids of the present invention, fluids can flow through the linear internal space provided in the tubular body. The fluid is supplied into the internal space from the fluid supply part at one end in the longitudinal direction of the internal space of the tubular body, and discharged from the discharge part at the other end to the outside of the internal space.

[0009] The fluid supplied into the internal space is also supplied into the flow passage of the guiding body accommodated in the internal space of the tubular body, and flows through the flow passage in the longitudinal direction of the guiding body. In addition, the fluid also flows in the longitudinal direction of the tubular body through the gap of a predetermined size between the outer peripheral part of the guiding body and the inner peripheral part forming the internal space of the tubular body.

[0010] In this way, the fluid supplied from the supply unit flows separately through the flow path inside the guide body and the gap outside the guide body on the supply unit side, and merges on the discharge unit side. As a result, fluids such as combustible gas and air that have passed through both routes can be efficiently mixed and activated.

[0011] 〔2〕The static mixer for fluid of the present invention, in the static mixer for fluid of 〔1〕 above, the guide body may have a nut block formed by connecting a required number of nuts in the thickness direction, and the flow path may be formed by the screw holes of each of the nuts.

[0012] In this case, since the guide body has a nut block formed by connecting a required number of nuts in the thickness direction and the flow path is formed by the screw holes of each nut, the fluid passing through the flow path is guided in a substantially spiral shape along the helix of the thread by the thread forming the screw hole and flows. As a result, the fluid becomes a turbulent flow even inside the flow path, and mixing at the discharge part can be performed more efficiently.

[0013] 〔3〕The static mixer for fluid of the present invention, in the static mixer for fluid of 〔2〕 above, the guide body may be configured by arranging a plurality of the nut blocks in parallel.

[0014] In this case, since the guide body is formed by arranging a plurality of nut blocks in parallel, the flow path can be divided into a plurality to allow the fluid to flow, and mixing of the fluid when they merge can be performed more efficiently.

[0015] 〔4〕The static mixer for fluid of the present invention, in the static mixer for fluid of 〔3〕 above, the guide body may be configured such that a plurality of the nut blocks are integrally twisted in the circumferential direction of the axis.

[0016] In this case, since the guiding body has a plurality of nut blocks twisted integrally in the axial circumferential direction, the outer peripheral portion and the flow passage form a gently spirally curved flow passage. As a result, the fluid flowing at high pressure is guided along the spirally curved outer peripheral portion and the flow passage, and becomes a turbulent flow while receiving stronger resistance than when it goes straight, so the mixing efficiency when they merge is further enhanced.

[0017] 〔5〕The stationary mixer for fluids of the present invention may be configured such that, in the stationary mixer for fluids of 〔1〕 above, the guiding body is formed by rolling a metal plate into a cylindrical shape and having the flow passage provided therein.

[0018] In this case, since the guiding body is formed by rolling a metal plate into a cylindrical shape and has a flow passage provided therein, the fluid supplied from the supply portion can be made to flow through the flow passage formed in the metal cylindrical body. Further, by rolling the metal plate into a cylindrical shape, the diameter of the cylindrical body can be appropriately adjusted, and in addition, a shape with a higher mixing effect can be obtained, such as forming a spiral shape in the cross-sectional shape.

[0019] 〔6〕The stationary mixer for fluids of the present invention may be configured such that, in the stationary mixer for fluids of 〔5〕 above, through holes penetrating the front and back are provided at predetermined positions of the metal plate.

[0020] In this case, since through holes penetrating the front and back are provided at predetermined positions of the metal plate, the fluid flowing through both routes of the flow passage inside the guiding body and the gap outside the guiding body will mutually enter and exit through the through holes into the flow passage and the gap. As a result, the fluid entering and exiting becomes a turbulent flow by colliding with the fluid passing through the flow passage and the gap, and the mixing efficiency is further enhanced.

[0021] 〔7〕The stationary mixer for fluids of the present invention may be configured such that, in the stationary mixer for fluids of 〔6〕 above, rising portions protruding from the front surface, the back surface, or both the front and back surfaces are provided along the edge portions of the through holes.

[0022] Here, when the rising portion is provided on the "front surface", "back surface" or "front and back surfaces", the fluid collides with the rising portion to form a turbulent flow, and the mixing efficiency is further enhanced. Further, when the rising portion is provided on the "front surface (excluding the region corresponding to the outer peripheral surface of the cylindrical body)", "back surface" or "front and back surfaces", when the cylindrical body is formed in a spiral cross-sectional shape, the rising portion serves as a spacer to ensure the formation of the interval between the layers of the spiral. Furthermore, when the rising portion is provided on the "front surface (limited to the region corresponding to the outer peripheral surface of the cylindrical body)", the rising portion serves as a spacer to ensure the formation of a gap between the inner peripheral portion of the pipe body.

[0023] 〔8〕The static mixer for fluids of the present invention may be configured such that, in the static mixer for fluids of the above 〔1〕, ridges or grooves are provided spirally on the inner peripheral wall of the pipe body from the supply portion toward the discharge portion.

[0024] In this case, since ridges or grooves are provided spirally on the inner peripheral wall of the pipe body from the supply portion toward the discharge portion, the fluid passing through the gap can be guided spirally along the ridges or grooves. Further, the fluid guided by the spiral ridges or grooves becomes a turbulent flow by contact with the ridges or grooves, and the mixing efficiency is further enhanced.

[0025] 〔9〕The static mixer for fluids of the present invention may be configured such that, in the static mixer for fluids of the above 〔1〕, grooves are provided linearly in the longitudinal direction on the inner peripheral wall of the pipe body from the supply portion toward the discharge portion.

[0026] In this case, since grooves are provided linearly in the longitudinal direction on the inner peripheral wall of the pipe body from the supply portion toward the discharge portion, the fluid passing through the gap can be guided linearly along the linear grooves. Further, this linear flow of the fluid can create a turbulent flow by contact with a fluid whose flow direction intersects, such as a spiral flow, and can further enhance the mixing efficiency.

[0027] 〔10〕To achieve the above object, the present invention provides a method for mixing a fluid, which includes a gap between the inner peripheral portion of a tubular body having a linear internal space with fluid supply and discharge portions at both ends in the length direction and the outer peripheral portion of a guiding body disposed inside the tubular body, and a flow path provided inside the guiding body. The fluid is caused to flow from the supply portion to the discharge portion in the length direction of the tubular body through the gap and the flow path, and is circulated through both routes of the in-and-out flow that enters and exits between the gap and the flow path.

[0028] The fluid mixing method of the present invention can create a flow in the length direction of the tubular body passing through the gap and the flow path from the fluid supply portion to the discharge portion between the inner peripheral portion of the tubular body having a linear internal space with fluid supply and discharge portions at both ends in the length direction and the outer peripheral portion of the guiding body disposed inside the tubular body. At the same time, an in-and-out flow that enters and exits between the gap and the flow path can be created.

[0029] In this way, by circulating through both the flow in the length direction of the tubular body passing through the gap and the flow path and the in-and-out flow that enters and exits between the gap and the flow path, on the supply portion side, the fluid separates and flows into the flow path inside the guiding body and the gap outside the guiding body, and then, while creating an in-and-out flow between the gap and the flow path, it merges on the discharge portion side. As a result, fluids such as combustible gas and air that have passed through both routes can be efficiently mixed and activated.

[0030] 〔11〕To achieve the above object, the present invention provides a stationary mixer for fluids in a tubular body having a linear central flow path with fluid supply and discharge portions at both ends in the length direction, wherein spiral ridges or grooves are provided in a spiral shape from the supply portion to the discharge portion on the inner peripheral portion forming the central flow path.

[0031] The static mixer for fluids of the present invention can allow a fluid to flow through a linear central flow path provided in a pipe body. The fluid is supplied into the central flow path from a fluid supply portion provided at one end in the length direction of the central flow path, and is discharged from a discharge portion provided at the other end to the outside of the central flow path. A part of the fluid flowing through the inside of the central flow path from the supply portion toward the discharge portion flows straight through substantially the central portion of the central flow path.

[0032] Also, another part of the fluid flows along the inner peripheral portion forming the central flow path. At this time, the fluid is guided to ridges or grooves spirally provided on the inner peripheral portion and flows in a spiral. Then, the fluid flowing straight through the inside of the central flow path and the fluid flowing in a spiral collide with each other repeatedly at the boundary portion therebetween to become a turbulent flow and are mixed, and are discharged from the discharge portion.

[0033] 〔12〕In the static mixer for fluids of the present invention, in the static mixer for fluids of the above 〔11〕, in the structure in which the spiral ridges are provided on the inner peripheral portion, a notch portion obtained by only notching the ridges may be provided on a predetermined straight line in the length direction of the pipe body, or a groove overlapping the notch portion may be provided in the length direction of the pipe body while notching the ridges and the inner peripheral portion.

[0034] In this case, since spiral ridges are provided on the inner peripheral portion, and a notch portion obtained by only notching the ridges is provided on a predetermined straight line in the length direction of the pipe body, or a groove overlapping the notch portion is provided in the length direction of the pipe body while notching the ridges and the inner peripheral portion, a flow that flows straight through each notch portion or a flow that flows straight through each notch portion and through the groove overlapping therewith newly occurs in the flowing fluid. As a result, in addition to the linear flow of the fluid passing through substantially the center of the central flow path, the newly generated linear flows further increase the number of collision locations with the fluid flowing in a spiral, so that the mixing of the fluid is performed more efficiently.

[0035] 〔13〕In the static mixer for fluids of the present invention, in the static mixer for fluids of the above 〔11〕, in the structure in which the spiral groove is provided in the inner peripheral portion, a groove intersecting the spiral groove may be provided in the longitudinal direction of the tube body.

[0036] In this case, since a spiral groove is provided in the inner peripheral portion and a groove intersecting the spiral groove is provided in the longitudinal direction of the tube body, a new flow that flows linearly through the groove in the inner peripheral portion is generated in the flowing fluid. As a result, in addition to the linear flow of the fluid passing through substantially the center of the central flow path, the newly generated linear flow further increases the locations where the linear flow collides with the fluid flowing in a spiral, so that the mixing of the fluid is performed more efficiently.

[0037] 〔14〕To achieve the above object, the present invention provides a tube body having a linear internal space with a fluid supply portion and a discharge portion at both ends in the longitudinal direction, and a guiding body accommodated in the internal space of the tube body, having ridges spirally provided on the outer peripheral portion from the supply portion toward the discharge portion, and a gap of a predetermined size being provided between the tip of the ridge and the inner peripheral portion forming the internal space of the tube body.

[0038] In the static mixer for fluids of the present invention, in the linear internal space provided in the tube body, fluid can flow through the gap between the inner peripheral portion forming the internal space of the tube body and the tip of the ridge of the guiding body accommodated in the internal space, and the space formed along the ridge. The fluid is supplied from the fluid supply portion at one end in the longitudinal direction of the internal space to the gap and the space, and discharged from the discharge portion at the other end to the outside of the internal space.

[0039] At this time, a part of the fluid flowing through the gap and the space from the supply portion to the discharge portion flows substantially straight in the gap, and the other part flows while drawing a spiral in the space. Then, the fluid flowing substantially straight through the gap and the fluid flowing in a spiral in the space repeatedly collide with each other at the boundary portion to become a turbulent flow and are mixed, and are discharged from the discharge portion.

[0040] 〔15〕In the static mixer for fluids of the present invention, in the static mixer for fluids of the above 〔14〕, a notch portion formed by only notching the protrusion is provided at a position on a predetermined straight line in the longitudinal direction of the guide body, or a groove overlapping the notch portion formed by notching the protrusion is provided in the longitudinal direction of the guide body while notching the protrusion.

[0041] In this case, since a notch portion formed by only notching the protrusion is provided at a position on a predetermined straight line in the longitudinal direction of the guide body, or a groove overlapping the notch portion formed by notching the protrusion is provided in the longitudinal direction of the guide body while notching the protrusion, in the flowing fluid, a flow that flows linearly through each notch portion, or a flow that flows linearly through each notch portion and through the groove overlapping therewith is newly generated.

[0042] Thereby, in addition to the linear flow of the fluid passing through the gap, the linear flow passing through the groove further increases the locations where the flows collide with each other with respect to the fluid flowing in a spiral, so that the mixing of the fluid is performed more efficiently.

[0043] 〔16〕In the static mixer for fluids of the present invention, in the static mixer for fluids of the above 〔14〕 or 〔15〕, the gap between the tip of the protrusion and the inner peripheral portion of the tubular body may be formed so as to have different sizes near the supply portion and near the discharge portion.

[0044] In this case, since the gap between the tip of the protrusion and the inner peripheral portion of the tubular body has different sizes near the supply portion and near the discharge portion, when the fluid is supplied from the supply portion at a constant pressure, due to the difference in the size of the gap, for example, the pressure becomes high at a place where the gap is narrow, etc., the internal pressure is likely to fluctuate, and it can be expected that more efficient mixing can be achieved.

[0045]

[17] In order to achieve the above object, the present invention provides a method for mixing fluids in a pipe having a linear central flow path with a fluid supply section and a fluid discharge section at both ends in the longitudinal direction, in which the fluid is circulated in the central flow path from the supply section to the discharge section in two ways: a linear flow in the longitudinal direction of the pipe through the central flow path, and a spiral flow along the inner periphery that forms the central flow path.

[0046] The fluid mixing method of the present invention can create and circulate a linear flow of fluid in the central flow path of a pipe, from the fluid supply section to the fluid discharge section, in the longitudinal direction of the pipe through the central flow path. Additionally, a spiral flow (which can also be called a swirling flow) of fluid can be created and circulated along the inner periphery that forms the central flow path. The fluid flowing straight inside the central flow path and the fluid flowing in a spiral repeatedly collide with each other at the boundary between the two routes, resulting in turbulent mixing.

[0047]

[18] In order to achieve the above object, the present invention provides a method for mixing fluids in a space between the inner periphery of a tube having a linear central flow path with fluid supply and discharge sections at both ends in the longitudinal direction, and the outer periphery of a guide body arranged inside the tube, and circulating the fluid from the supply section to the discharge section in two ways: a linear flow in the longitudinal direction of the tube through the gap, and a spiral flow along the outer periphery.

[0048] The fluid mixing method of the present invention can create and circulate a linear flow of fluid in the longitudinal direction of the pipe from the fluid supply section to the fluid discharge section in the space between the outer periphery of a guide body disposed inside the pipe and the inner periphery of the pipe, and can also create and circulate a spiral flow of fluid along the outer periphery of the guide body.

[0049] In this way, part of the fluid flowing through the space from the supply part to the discharge part flows in a substantially straight line along the length of the pipe, while the other part flows in a spiral pattern in the space. The fluid flowing in a substantially straight line and the fluid flowing in a spiral pattern in the space repeatedly collide with each other at the boundary between them, resulting in turbulent mixing.

[0050] 〔19〕The fluid mixing method of the present invention can also cause the fluid to flow in a direction intersecting the spiral flow and in the longitudinal direction of the tubular body in the static mixer for fluids described in the above

[17] or

[18] .

[0051] In this case, compared with the static mixer for fluids described in

[17] or

[18] , the routes of the fluid intersecting the spiral flow further increase, so the locations where the fluids collide in each route also increase, and the mixing of the fluids can be performed more efficiently.

[0052] 〔20〕The fluid mixing method of the present invention can also cause different types of fluids to flow simultaneously inside the tubular body in the static mixer for fluids described in the above

[17] or

[18] .

[0053] In this case, since different types of fluids flow simultaneously inside the tubular body, mixing of the fluids in all combinations becomes possible. Therefore, it is possible to flexibly respond to the mixing requirements in various fields and is extremely useful as a static mixer for fluids.

[0054] In the present invention, the terms "mixer" and "mixing" are used to include both the meaning of mixing a plurality of different types of fluids and stirring a single fluid.

Advantages of the Invention

[0055] The present invention can provide a static mixer for fluids and a fluid mixing method that can more efficiently mix and activate fluids such as combustible gas and air used in, for example, a torch for pressure welding.

Brief Description of the Drawings

[0056]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Embodiments for Carrying Out the Invention

[0057] With reference to FIGS. 1 to 14, the embodiments of the present invention will be described in more detail. First, the welding torch 9 shown in Fig. 1 is for heating the welded portion of steel materials for welding steel materials or the like. The welding torch 9 has a gas introduction pipe 90. The gas introduction pipe 90 is composed of a base introduction pipe 90a and a tip introduction pipe 90b. A combustible gas supply pipe 91 having a valve (reference numeral omitted) and an oxygen supply pipe 92 are connected to the base introduction pipe 90a so as to be mergeable.

[0058] A static mixer A for fluid according to the present invention is attached between the base introduction pipe 90a and the tip introduction pipe 90b. And, a U-shaped branch pipe 93 is connected to the tip of the tip introduction pipe 90b, and burner pipes 94 and 95 are connected to both tips of the branch pipe 93 so as to face each other. A plurality of burner ports 96 are attached to the burner pipes 94 and 95 so as to face inward (the central direction on the same plane).

[0059] (Static mixer A1 for fluid) Figs. 2, 3, and 4 show a static mixer A1 for fluid which is a first embodiment of the static mixer for fluid of the present invention. The static mixer A1 for fluid includes a pipe body 1 made of metal (brass in this embodiment). The pipe body 1 has a predetermined length and an outer shape of a hexagonal prism. Inside the pipe body 1, an inner peripheral surface 19 is formed which forms an internal space 4 having a circular hole shape in the central portion and linear in the longitudinal direction.

[0060] In the pipe body 1, the inside of the base introduction pipe 90a and the tip introduction pipe 90b which are connected to the internal space 4 at both ends in the longitudinal direction thereof serve as a supply path 901 for supplying fluid and a discharge path 902 for discharging. Note that the tip of the base introduction pipe 90a is connected to the supply portion side (the right side in Fig. 2(a)) of the pipe body 1 via a tapered thread (reference numeral omitted), and the tip of the tip introduction pipe 90b is similarly connected to the discharge side (the left side in Fig. 2(a)) via a tapered thread (reference numeral omitted). Thereby, the supply path 901 and the discharge path 902 communicate with the internal space 4.

[0061] In addition, on the inner peripheral surface 19, spiral blades 10a and 10b that form ridges over the entire length of the internal space 4 are provided at a predetermined pitch. The spiral blades 10a and 10b are double screws, and by widening the pitch compared to a single screw, the fluid can flow more smoothly and at high speed with less resistance. Note that, instead of providing the spiral blades 10a and 10b, a structure in which spiral grooves (not shown) are provided at the same position can also be adopted.

[0062] Note that the pitch of the spiral blades 10a and 10b and the spiral grooves in this case is not particularly limited. Also, in this embodiment, double screws are employed, but triple, quadruple, or even more multiple screws may be used. Further, the cross-sectional shape of the groove (or the portion forming the groove) is not particularly limited and may be, for example, semi-circular, U-shaped, V-shaped, or the like. Similarly, it goes without saying that the cross-sectional shape of the ridge is not particularly limited.

[0063] Furthermore, the spiral angle of the spiral blades 10a and 10b and the spiral grooves is not particularly limited. If the spiral angle with respect to the axis of the pipe body 1 is too large, the spiral flow of the fluid flowing inside is less likely to occur, so the flow velocity of the fluid is likely to be slow, and the pressure of the fluid during the collision of the fluids is also less likely to increase. Therefore, it will act disadvantageously in the activation (clustering) of the fluid.

[0064] Conversely, if the spiral angle with respect to the axis of the pipe body 1 is too small, the spiral flow is likely to occur, so the flow velocity of the fluid is high, and the pressure during the collision of the fluids is also likely to increase, so it will act advantageously in the activation of the fluid. Note that the spiral angle is set, for example, within the range of 10 to 60° (actually, it becomes an appropriate angle because it is also related to the protrusion amount of the spiral blades 10a and 10b and the depth of the spiral grooves), but it is not particularly limited.

[0065] Further, on the inner peripheral surface 19, together with the spiral blades 10a and 10b, grooves 11 having a predetermined width and depth in the length direction of the pipe body 1 are provided. The grooves 11 are provided at three locations in the circumferential direction of the inner peripheral surface 19, parallel to each other at 120° intervals (see FIG. 3). Further, each groove 11 forms a notch portion 13 by notching the spiral blades 10a and 10b located at positions overlapping the groove 11. Note that the number of the grooves 11 is not particularly limited and can be set as appropriate.

[0066] Also, in the present embodiment, each groove 11 is provided by notching the inner peripheral surface 19 and the spiral blades 10a and 10b, but the present invention is not limited thereto. For example, only the spiral blades 10a and 10b may be notched without providing them on the inner peripheral surface 19. In addition, when a structure is adopted in which grooves (not shown) are provided in a spiral shape without providing the spiral blades 10a and 10b, the groove 11 may be provided so as to intersect with the spiral groove at the same depth.

[0067] In the central portion of the internal space 4 (inside the spiral blades 10a and 10b), a guiding body 3 is accommodated. The guiding body 3 is formed by connecting a required number of nuts 35 (hexagonal nuts) in the thickness direction through a wire 36 passing through screw holes 350 (see FIG. 4) and arranging three nut blocks 300 formed to have a predetermined length in parallel. As a result, each nut block 300 is formed with a flow passage 37 (see FIG. 4) having the same length as the nut block 300 and composed of the screw holes 350.

[0068] Further, the three nut blocks 300 are integrally twisted in the axial circumferential direction. As a result, a gently spiral groove-shaped recess (reference numeral omitted) is formed on the outer peripheral portion of the guiding body 3, and the space between each nut 35 is slightly loosened, and an irregular gap (reference numeral omitted) is formed between each nut 35. Note that the thickness of the guiding body 3 is made to generally fit within the inner diameter of the blade tip portions of the spiral blades 10a and 10b, and is substantially fixed by the frictional force with the spiral blades 10a and 10b after being accommodated (see FIG. 4).

[0069] Also, when accommodating the guide body 3 in the central part of the internal space 4, first, insert the surplus part 360 of the wire 36 into the internal space 4 from the fluid supply side of the pipe body 1, slightly push in the nut block 300, and then pull the surplus part 360 that has come out from the discharge side to accommodate it at an appropriate position in the internal space 4. In the present embodiment, for the sake of illustration, the guide body 3 is arranged in a right-packed manner in the internal space 4, but actually it is arranged throughout the entire internal space 4.

[0070] Thereby, a gap 40 is formed between the guide body 3 and the inner peripheral surface 19. The gap 40 is composed of a space (reference numeral omitted) formed between the inner peripheral surface 19 and the outer peripheral part of the guide body 3 between the spiral blades 10a and 10b.

[0071] (Operation) Referring to FIGS. 2 to 4, the operation of the static mixer A1 for fluids will be described. FIG. 2(a) is a cross-sectional explanatory view of the static mixer A1 for fluids, and FIG. 2(b) is an explanatory view showing the flow of the fluid at the cross-sectional line position in FIG. 2(a) during mixing.

[0072] In the following description of mixing by the static mixer A1 for fluids, acetylene gas (C2H2) and oxygen gas (O2) mixed at a predetermined ratio will be taken as an example of the fluid to be mixed, but it is not limited thereto. Examples of fluids that can be mixed include various gases, various liquids, or fluid solids such as various powders. Also, the use of the fluid is not limited to gases used in heating equipment such as various industrial torches, and it can also be used, for example, for mixing various medical gases.

[0073] And during mixing, the acetylene gas and oxygen gas supplied to the static mixer A1 for fluids may be primarily mixed when passing through the supply path 901 or upstream thereof, or may be mixed simultaneously with mixing after being supplied to the pipe body 1. The same applies to the cases of the static mixers A2, A3, A3-1, A4, A4-1, and A4-2 for fluids described below.

[0074] In the static mixer A1 for fluids, the fluid, which is a mixture of acetylene gas and oxygen gas, passes through the supply passage 901, which is the fluid supply section, and is supplied to each flow passage 37 of the guiding body 3 provided at the center of the pipe body 1. Also, a part (or many parts) of the fluid is supplied to the gap 40.

[0075] The flow of the fluid passing through each flow passage 37 is guided to the thread by passing through the screw hole 350 and becomes a spiral flow g1 (the pitch of the spiral does not necessarily match the pitch of the thread). This spiral flow g1 occurs in each of the three flow passages 37 and is sent from the discharge side of each flow passage 37 to the discharge passage 902 while being mixed (see FIGS. 2(a) and (b)).

[0076] Also, the fluid supplied to the gap 40 becomes a spiral flow g2 in which the spiral flow along the concave portion of the outer peripheral part due to the twist of the nut mass 300 and the spiral flow along the spiral vanes 10a and 10b are combined, and a straight flow g3 along the groove 11. Since their flow directions intersect, they repeatedly collide with each other at the boundary portion and become a turbulent flow and are sent to the discharge passage 902 while being mixed.

[0077] Furthermore, due to the pressure of the spiral flow g1 passing through the flow passage 37, the spiral flow g2 passing through the gap 40, and the straight flow g3, a large number of inflow and outflow flows g4 that enter and exit between the gap 40 and the flow passage 37 are sent to the discharge passage 902 while being mixed together with the spiral flows g1, g2, and the straight flow g3. In the enlarged view of FIG. 2(b), the nut mass 300 having the flow passage 37 formed by the screw hole 350 inside each nut 35 is represented by a double dotted line (chain line).

[0078] Then, the spiral flows g1, g2, the straight flow g3, and the inflow and outflow flows g4 also merge and are efficiently mixed when entering the discharge passage 902, and pass through the discharge passage 902, which is the discharge section, and are discharged to the outside of the static mixer A1 for fluids (see FIGS. 2(a) and (b)).

[0079] Note that since the flow rate of the fluid during mixing is adjusted to be sufficiently high, the acetylene gas and oxygen gas that make up the fluid can be efficiently mixed and sufficiently activated under high pressure. The same applies to the stationary mixers A2, A3, A3-1, A4, A4-1, and A4-2 for fluids, which will be described below.

[0080] (Stationary mixer A2 for fluid) Figures 5 to 8 show a stationary mixer A2 for fluid, which is a second embodiment of the stationary mixer for fluid of the present invention. The stationary mixer A2 for fluid includes a metal pipe body 1. Since the pipe body 1 of the stationary mixer A2 for fluid has the same structure as the pipe body 1 of the stationary mixer A1 for fluid, the description thereof is incorporated herein, and detailed description here is omitted. In FIG. 5, the same portions as the pipe body 1 in FIG. 2 are denoted by the same reference numerals.

[0081] A guide body 3a is accommodated in the central portion (inside the spiral vanes 10a and 10b) of the internal space 4 of the stationary mixer A2 for fluid. The guide body 3a is formed by processing a plate body 38 made of metal (copper in this embodiment). That is, the plate body 38 has a substantially trapezoidal shape in plan view, with the upper side slightly longer than the lower side, and the upper side and the lower side are slightly curved in the same direction (see FIG. 7).

[0082] The plate body 38 is provided with a required number of through holes 39a and 39b that penetrate the front and back surfaces. Each through hole 39a is a through hole punched from the front surface side (the surface visible in FIG. 7) to the back surface side, and each through hole 39b is a through hole punched from the back surface side to the front surface side. As a result, a large number of through holes 39a and 39b are formed in the plate body 38 at regular intervals in the vertical and horizontal directions alternately.

[0083] As a result, rising portions 390 protruding toward the back surface side are formed along the edges of the through holes 39a, and rising portions 390 protruding toward the front surface side are formed along the edges of the through holes 39b (see FIGS. 7 and 8 and FIG. 5(a) described later). In the present embodiment, the rising portions 390 protrude toward both the front surface side and the back surface side. However, it is also possible to provide only the through holes 39a having the rising portions 390 protruding toward the back surface side, or only the through holes 39b having the rising portions 390 protruding toward the front surface side.

[0084] Then, the guide body 3a is formed by appropriately rounding the plate body 38 with a diameter so as to form round openings on the long side and the short side. As a result, the plate body 38 becomes a cylindrical body, a supply port 301 with a slightly larger diameter is formed on the long side, a discharge port 302 with a smaller diameter is formed on the short side, and a substantially straight flow path 30 is formed inside in the length direction.

[0085] The guide body 3a is accommodated in the central portion of the internal space 4 of the static mixer A2 for fluid, with the supply port 301 on the base introduction pipe 90a side and the discharge port 302 on the tip introduction pipe 90b side, and is substantially fixed by the frictional force with the spiral blades 10a and 10b after accommodation. Further, the guide body 3a is accommodated so that the thickness narrows toward the discharge side, and the pressure on the discharge side in the flow path 30 is increased. Note that the guide body 3a can also be formed with the same thickness throughout.

[0086] Note that the guide body 3a has a spiral cross-sectional shape, and both rising portions 390 protruding from the front and back surface sides of the outer peripheral surface side and the inner peripheral surface side cooperate to ensure the formation of the intervals between the layers of the spiral (see FIG. 8). Further, when the guide body 3a is accommodated in the internal space 4, the rising portions 390 protruding from the outer peripheral surface side (front surface side) contact the spiral blades 10a and 10b and the inner peripheral surface 19, so that the rising portions 390 serve as spacers and ensure the formation of the gap 40 between the inner peripheral portion 19 of the pipe body 1.

[0087] (Operation) Referring to FIGS. 5 to 8, the operation of the static mixer A2 for fluids will be described. Note that FIG. 5(a) is a cross-sectional explanatory view of the static mixer A2 for fluids, and FIG. 5(b) is an explanatory view showing the flow of the fluid at the cross-sectional line position in FIG. 5(a) during mixing.

[0088] In the static mixer A2 for fluids, the fluid, which is a mixture of acetylene gas and oxygen gas, passes through the supply passage 901, which is the fluid supply section, and is supplied through the supply port 301 to the flow passage 30 of the guiding body 3a provided at the center of the pipe body 1. Also, a part (or a large part) of the fluid is supplied to the gap 40.

[0089] The flow of the fluid flowing through the flow passage 30 becomes a substantially straight flow g5 while being partially mixed by contact with the inner wall (reference numerals omitted) and the rising portion 390 that are in a spiral and layered shape, and is discharged from the discharge port 302 and sent to the discharge passage 902 (see FIGS. 5(a) and 5(b)).

[0090] Also, the fluid supplied to the gap 40 becomes a straight flow g7 along the groove 11 and a spiral flow g6 flowing along the spiral vanes 10a and 10b. Since their flow directions intersect, they repeatedly collide with each other at the boundary portion and become a turbulent flow and are mixed while being sent to the discharge passage 902 (see FIG. 5(b)).

[0091] Furthermore, due to the pressure of the substantially straight flow g5 flowing through the flow passage 30, the spiral flow g6 and the straight flow g7 flowing through the gap 40, a large number of in-and-out flows g8 that enter and exit between the gap 40 and the flow passage 30 pass through the respective through holes 39a and 39b of the guiding body 3a and are sent to the discharge passage 902 while being mixed together with the substantially straight flow g5, the spiral flow g6, and the straight flow g7 (see the enlarged view of FIG. 5(b)).

[0092] Then, the approximate straight flow g5, spiral flow g6, straight flow g7, and inflow / outflow flow g8 also merge and are efficiently mixed when entering the discharge path 902, and are discharged to the outside of the static mixer A2 for fluid through the discharge path 902 which is the discharge part (see FIGS. 5(a) and 5(b)). In the enlarged view of FIG. 5(b), the guide body 3a having a large number of through holes 39a and 39b in the peripheral wall is represented by a dotted line (chain line).

[0093] (Static mixer A3 for fluid) FIG. 9 shows a static mixer A3 for fluid which is a third embodiment of the static mixer for fluid of the present invention. The static mixer A3 for fluid includes a tubular body 1c made of metal (for example, brass). The tubular body 1c has a predetermined length and an outer shape that is a hexagonal prism. Inside the tubular body 1c, an inner peripheral surface 19 (inner peripheral part) that forms a central flow path 100 having a circular hole shape and linear in the length direction is formed at the center part.

[0094] In the tubular body 1c, the interiors of the base introduction pipe 90a and the tip introduction pipe 90b that are connected to the central flow path 100 at both ends in the length direction thereof serve as a supply path 901 for supplying fluid and a discharge path 902 for discharging fluid. Note that the tip of the base introduction pipe 90a is connected to the supply part side of the tubular body 1c via a taper neck (reference numeral omitted), and the tip of the tip introduction pipe 90b is similarly connected to the discharge side via a taper neck (reference numeral omitted). Thereby, the supply path 901 and the discharge path 902 communicate with the central flow path 100.

[0095] Also, on the inner peripheral surface 19, spiral blades 10a and 10b that constitute ridges over the entire length of the central flow path 100 are provided at a predetermined pitch. The spiral blades 10a and 10b are double screws, and by widening the pitch compared to a single screw, the fluid can flow more smoothly at high speed with less resistance. Note that a structure in which grooves (not shown) are similarly provided in a spiral shape can also be adopted instead of providing the spiral blades 10a and 10b.

[0096] Note that the pitches of the spiral blades 10a and 10b and the spiral grooves in this case are not particularly limited. In this embodiment, a double screw is employed, but a triple, quadruple, or even more multi-screw may be used.

[0097] Also, the cross-sectional shape of the groove (or the portion forming the groove) is not particularly limited, and may be, for example, semi-circular, U-shaped, V-shaped, or the like. Similarly, it goes without saying that the cross-sectional shape of the protrusion is not particularly limited.

[0098] Furthermore, the spiral angles of the spiral blades 10a and 10b and the spiral grooves are not particularly limited. If the spiral angle with respect to the axis of the pipe body 1c is too large, the spiral flow of the fluid flowing inside is less likely to occur, so the flow velocity of the fluid is likely to be slow, and the pressure of the fluid during the collision of the fluids is also less likely to increase. Therefore, it will work disadvantageously in the activation (clustering) of the fluid.

[0099] Conversely, if the spiral angle with respect to the axis of the pipe body 1c is too small, the spiral flow is likely to occur, so the flow velocity of the fluid will be fast, and the pressure during the collision of the fluids is also likely to increase, so it will work advantageously in the activation of the fluid. Note that the spiral angle is set, for example, within the range of 10 to 60° (actually, it becomes an appropriate angle because the protrusion amount of the spiral blades 10a and 10b and the depth of the spiral grooves are also related), but it is not particularly limited.

[0100] (Function) Referring to FIG. 9, the function of the static mixer A3 for fluids will be described. Note that FIG. 9(a) is a cross-sectional explanatory view of the static mixer A3 for fluids, and FIG. 9(b) is an explanatory view showing the flow of the fluid at the cross-sectional line position in (a) during mixing.

[0101] The fluid, which is a mixture of acetylene gas and oxygen gas, passes through the supply passage 901, which is the fluid supply part of the static mixer A3 for fluids, and is supplied to the central flow passage 100 provided at the center of the pipe body 1c. Then, a part (or many parts) of the fluid becomes a substantially straight flow (flow g9 in FIG. 9(b)) along the central flow passage 100.

[0102] Also, another part of the fluid flows along the inner peripheral surface 19 of the tubular body 1c forming the central flow path 100 and the spiral blades 10a, 10b, and is guided by the spiral blades 10a, 10b to form a spiral flow (in FIG. 9(b), the flow g10) that flows in a spiral pattern.

[0103] Then, the fluid flowing straight in the central flow path 100 in the flow g9 direction and the fluid flowing in the flow g10 direction in a spiral pattern collide with each other repeatedly at the boundary portion due to the intersecting flow directions, resulting in a turbulent flow and being mixed, and then are discharged to the outside of the static mixer A3 for fluid through the discharge path 902 which is the discharge portion.

[0104] Also, since the flow velocity of the fluid during mixing is adjusted to be sufficiently high, the acetylene gas and oxygen gas constituting the fluid can be efficiently mixed under high pressure and fully activated.

[0105] (Static mixer A3-1 for fluid) FIG. 10 shows a static mixer A3-1 for fluid which is a modified example of the static mixer A3 for fluid of the present invention. The static mixer A3-1 for fluid is provided with grooves 11 having a predetermined width and depth in the length direction of the tubular body 1a on the inner peripheral surface 19 in addition to the configuration of the static mixer A3 for fluid described above.

[0106] The grooves 11 are provided at four locations on the inner peripheral surface 19 in parallel with each other at 90° intervals in the circumferential direction. Also, each groove 11 forms a notch portion 13 by notching the spiral blades 10a, 10b located at positions overlapping the groove 11. Note that the number of the grooves 11 is not particularly limited and can be set as appropriate.

[0107] Also, in the present embodiment, each groove 11 is provided by notching the inner peripheral surface 19 and the spiral blades 10a, 10b, but the present invention is not limited thereto. For example, only the spiral blades 10a, 10b may be notched without providing them on the inner peripheral surface 19. In the case where a groove (not shown) is provided in a spiral shape without providing the spiral blades 10a, 10b, the groove 11 may be provided so as to intersect with the spiral groove at the same depth.

[0108] (Function) Referring to Fig. 10, the function of the static mixer A3-1 for fluids will be described. Note that Fig. 10(a) is a longitudinal sectional explanatory view of the static mixer A3-1 for fluids, and Fig. 10(b) is an explanatory view showing the flow of the fluid at the cross-sectional line position in (a) during mixing.

[0109] For the static mixer A3-1 for fluids, the functions resulting from the same configuration as the above-described static mixer A3 for fluids are the same as those of the static mixer A3 for fluids. That is, the fluid supplied from the supply passage 901 and flowing straight through the inside of the central flow passage 100 in the g9 direction and the fluid flowing in the g10 direction in a spiral pattern collide repeatedly at their boundary portions due to the intersecting flow directions, becoming turbulent and being mixed, and are discharged to the outside of the static mixer A3-1 for fluids through the discharge passage 902 which is the discharge portion.

[0110] In addition, in the static mixer A3-1 for fluids, in the fluid flowing through the central flow passage 100, there newly occur a flow flowing linearly through each notch portion 13 of each spiral blade 10a, 10b and a flow flowing linearly through each groove 11 which passes through each notch portion 13 and overlaps with it (flow g11 in Fig. 10(b)). As a result, in addition to the linear flow g9 of the fluid passing through the approximate center of the central flow passage 100, four linear flows g11 increase, so that the number of collision locations with the flow g10 flowing in a spiral pattern further increases. Thereby, the mixing of the fluid is performed more efficiently.

[0111] (Static mixer A4 for fluids) Fig. 11 shows a static mixer A4 for fluids which is a fourth embodiment of the static mixer for fluids of the present invention. The static mixer A4 for fluids includes a metal tube 1b. The tube 1b has a predetermined length and an outer shape of a hexagonal prism. Inside the tube 1b, an inner peripheral surface 19 (inner peripheral portion) forming an internal space 4 having a circular hole shape and linear in the longitudinal direction is formed at the center.

[0112] In the pipe body 1b, the interiors of the base introduction pipe 90a and the tip introduction pipe 90b, which are connected to the internal space 4 at both ends in the length direction thereof, form a supply path 901 for supplying fluid and a discharge path 902 for discharging fluid. Note that the tip of the base introduction pipe 90a is connected to the supply side of the pipe body 1b via a taper thread (reference sign omitted), and the tip of the tip introduction pipe 90b is similarly connected to the discharge side via a taper thread (reference sign omitted). Thereby, the supply path 901 and the discharge path 902 communicate with the internal space 4.

[0113] In the central portion of the internal space 4, a guiding body 3b is accommodated. The guiding body 3b has a linear substantially round bar shape with a predetermined diameter. The guiding body 3b is provided with conical guiding portions 31, 32 at both ends in the length direction to assist the flow of fluid flowing therethrough. Further, the guiding body 3b is fixed to the base introduction pipe 90a and the tip introduction pipe 90b in a structure allowing fluid to flow therethrough in such a manner that the guiding portions 31, 32 are accommodated in the supply path 901 and the discharge path 902.

[0114] In addition, on the outer peripheral surface 39, which is the outer peripheral portion of the guiding body 3b, spiral blades 30a, 30b constituting ridges are provided at a predetermined pitch over the entire length thereof. The spiral blades 30a, 30b are double screws, and by widening the pitch compared to single screws, the fluid can flow more smoothly and at high speed with less resistance. Note that instead of providing the spiral blades 30a, 30b, a structure in which grooves (not shown) are also provided in a spiral shape can also be adopted.

[0115] Thereby, a space 40 is provided between the guiding body 3b and the inner peripheral surface 19. The space 40 is constituted by a space (reference sign omitted) between the spiral blades 30a, 30b and a gap 400 provided with a predetermined width between the inner peripheral surface 19 forming the internal space 4 of the pipe body 1b over the entire length of the tips of the spiral blades 30a, 30b.

[0116] (Operation) With reference to FIG. 11, the operation of the static mixer A4 for fluid will be described. Note that FIG. 11(a) is a cross-sectional explanatory view of the static mixer A4 for fluid, and FIG. 11(b) is an explanatory view showing the flow of fluid at the cross-sectional line position in (a) during mixing.

[0117] A fluid that is a mixture of acetylene gas and oxygen gas passes through a supply passage 901, which is a fluid supply section of a stationary mixer A4 for fluids, and is supplied to an internal space 4 provided at the center of a pipe body 1b. Then, a part of the fluid becomes a substantially straight flow (flow g13 in FIG. 11(b)) along the inner peripheral surface 19 of the pipe body 1b and a gap 400.

[0118] Also, another part of the fluid flows through a space 40 along the spiral blades 30a and 30b and the inner peripheral surface 19, and is guided by the spiral blades 30a and 30b to form a spiral flow (flow g12 in FIG. 11(b)).

[0119] Then, since the substantially straight flow g13 along the inner peripheral surface 19 of the pipe body 1b and the fluid flowing in the direction of the spiral flow g12 intersect in the flowing direction, they repeatedly collide with each other at the boundary portion to become a turbulent flow and are mixed, and are discharged to the outside of the stationary mixer A4 for fluids through a discharge passage 902, which is a discharge section.

[0120] Also, since the flow velocity of the fluid during mixing is adjusted to be sufficiently high, the acetylene gas and oxygen gas constituting the fluid can be efficiently mixed and sufficiently activated under high pressure.

[0121] (Stationary mixer A4-1 for fluids) FIG. 12 shows a stationary mixer A4-1 for fluids, which is a first modified example of the stationary mixer A4 for fluids of the present invention. In addition to the configuration of the stationary mixer A4 for fluids, grooves 34 having a predetermined width and depth in the length direction are provided on the outer peripheral surface 39 of a guiding body 3c.

[0122] The grooves 34 are provided at four locations in the circumferential direction of the outer peripheral surface 39 in parallel with each other at 90° intervals. Also, each groove 34 forms a notch 33 by cutting notches in the spiral blades 30c and 30d located at positions overlapping the groove 34. Note that the number of grooves 34 is not particularly limited and can be set as appropriate.

[0123] In addition, in the present embodiment, each groove 34 is provided by cutting notches in the outer peripheral surface 39 and the spiral blades 30c and 30d. However, the present invention is not limited to this. For example, the spiral blades 30c and 30d may be provided by cutting notches without providing them on the inner peripheral surface 19. In addition, when the structure is such that grooves (not shown) are provided in a spiral shape without providing the spiral blades 30c and 30d, the groove 34 may be provided so as to intersect with the spiral groove at the same depth.

[0124] (Function) Referring to FIG. 12, the function of the static mixer A4-1 for fluids will be described. Note that FIG. 12(a) is a cross-sectional explanatory view of the static mixer A4-1 for fluids, and FIG. 12(b) is an explanatory view showing the flow of the fluid at the cross-sectional line position in (a) during mixing.

[0125] The static mixer A4-1 for fluids has the same function as that of the static mixer A4 for fluids with respect to the function resulting from the same configuration as the above-described static mixer A4 for fluids. That is, the fluid supplied from the supply passage 901 and flowing straight through the gap 400 in the direction g13 and the fluid flowing in the direction g12 along a spiral cross each other in the flowing direction. Therefore, at the boundary portion, they repeatedly collide with each other to become a turbulent flow and are mixed, and then are discharged to the outside of the static mixer A4-1 for fluids through the discharge passage 902 which is the discharge portion.

[0126] In addition, in the static mixer A4-1 for fluids, in the fluid flowing through the space 40, a flow that flows linearly through each notch portion 33 of each of the spiral blades 30c and 30d and a flow that flows linearly through each groove 34 that passes through each notch portion 33 and overlaps with it (flow g14 in FIG. 12(b)) newly occur. As a result, in addition to the linear flow g13 of the fluid passing through the gap 400, four linear flows g14 increase, so that the number of portions where the flows collide with each other with respect to the flow g12 flowing in a spiral further increases. Thereby, the mixing of the fluid is performed more efficiently.

[0127] (Static mixer A4-2 for fluids) Figure 13 shows a static mixer A4-2 for fluids, which is a second modification of the static mixer A4 for fluids of the present invention. The static mixer A4-2 for fluids includes a pipe body 1b having the same structure as the above-described static mixer A4 for fluids.

[0128] A guiding body 3d is accommodated in the central part of the internal space 4 of the pipe body 1b. The guiding body 3d is formed in a partial conical shape and is fixed to the base introduction pipe 90a and the tip introduction pipe 90b in a structure allowing fluid to flow through so that the thicker side is located on the supply path 901 side.

[0129] In addition, spiral blades 30e and 30f are provided at a predetermined pitch over the entire outer peripheral surface 39a of the guiding body 3d. The spiral blades 30e and 30f are double screws, and by widening the pitch compared to a single screw, the fluid can flow more smoothly at high speed with less resistance. Note that, instead of providing the spiral blades 30e and 30f, a structure in which grooves (not shown) are also provided spirally can also be adopted.

[0130] In addition, a space 40a is provided between the guiding body 3d and the inner peripheral surface 19 of the pipe body 1b. The space 40a is constituted by a gap 400a provided with a predetermined width between the inner peripheral surface 19 forming the internal space 4 of the pipe body 1b and the space (reference numeral omitted) between the spiral blades 30e and 30f and over the entire length of the tips of the spiral blades 30e and 30f. As a result, the sizes of the space part 41 near the supply path 901 and the space part 42 near the discharge path 902 of the space 40a are different, and the space part 42 is larger.

[0131] (Operation) Referring to Figure 13, the operation of the static mixer A4-2 for fluids will be described. Regarding the operation resulting from the substantially same configuration as the above-described static mixer A4 for fluids, the static mixer A4-2 for fluids is the same as the operation of the static mixer A4 for fluids.

[0132] That is, the fluid supplied from the supply passage 901 and flowing linearly along the inner peripheral surface 19 through the gap 400a in the g13 direction, and the fluid induced by the spiral vanes 30e and 30f and flowing in the g12 direction in a spiral, collide with each other repeatedly at their boundary due to the intersecting flow directions, becoming turbulent and being mixed, and are discharged to the outside of the static mixer A4-2 for fluid through the discharge passage 902 which is the discharge part.

[0133] Also, in the space part 41 near the supply passage 901 and the space part 42 near the discharge passage 902 of the space 40a between the tip parts of the spiral vanes 30e and 30f and the inner peripheral surface 19 of the pipe body 1b, the sizes are different, and the space part 42 is larger. Thus, when the fluid is supplied from the supply passage 901 at a constant pressure, due to the difference in size between the space part 41 and the space part 42, for example, the place where the gap is narrow (space part 41) has a higher pressure and the like, and the internal pressure fluctuates easily, and it can be expected that more efficient mixing can be achieved.

[0134] With reference to FIG. 14, a variation (variation) in the usage location of the pressure contact torch in the static mixer A4 for fluid will be described. Here, for convenience, the static mixer A4 for fluid is taken as an example for explanation, but it is also possible to similarly adopt other static mixers A1, A2, A3, A3-1, A4-1, A4-2 for fluid.

[0135] What is shown in FIG. 14(a) is a type in which acetylene gas and oxygen gas are respectively supplied to the static mixer A4 for fluid, and mixed inside the static mixer A4 for fluid for mixing. Also, what is shown in FIG. 14(b) is a type in which only oxygen gas is mixed by the static mixer A4 for fluid and mixed with acetylene gas through the base introduction pipe 90a.

[0136] Also, what is shown in FIG. 14(c) is a type in which only acetylene gas is mixed by the static mixer A4 for fluid and mixed with oxygen gas through the base introduction pipe 90a. In any of the above types, finally, the activated mixture of acetylene gas and oxygen gas is supplied from the tip introduction pipe 90b.

[0137] Note that the static mixers A1 to A4-2 for fluids are not limited to being used only with the above-mentioned welding torch, and can also be adopted as gas mixers arranged in the vicinity of the upstream side of the burner port of other heating appliances, such as gas burners used for welding.

[0138] The terms and expressions used in this specification and the claims are for explanatory purposes only and are not restrictive at all. There is no intention to exclude terms and expressions equivalent to the features described in this specification and the claims and parts thereof. Needless to say, various modifications are possible within the scope of the technical idea of the present invention.

Explanation of Reference Numerals

[0139] A1 Static mixer for fluids 1 Pipe body 4 Internal space 40 Gap 10a, 10b Helical blades 11 Groove 13 Notch 3 Guide 300 Nut block 35 Nut 350 Threaded hole 36 Wire 360 Excess length part 37 Flow passage A2 Static mixer for fluids 1 Pipe body 4 Internal space 40 Gap 10a, 10b Helical blades 11 Groove 13 Notch 3a Guide 38 Plate body 39a Through hole 39b Through hole 390 Uplift part 301 Supply port 302 Discharge port A3 Static mixer for fluids 1c Pipe body 100 Central flow path Supply path 901 Discharge path 902 Helical blades 10a, 10b Static mixer A3-1 for fluid Pipe body 1a Groove 11 Notch 13 Static mixer A4 for fluid Pipe body 1b Guide 3b Helical blades 30a, 30b Outer peripheral surface 39 Internal space 4 Space 40 Gap 400 Static mixer A4-1 for fluid Guide 3c Groove 34 Helical blades 30c, 30d Notch 33 Static mixer A4―2 for fluid Guide 3d Internal space 4 Space 40a Gap 400a Space part 41 Space part 42 Welding torch 9 Gas introduction pipe 90 Base introduction pipe 90a Supply path 901 Tip introduction pipe 90b Discharge path 902 Combustible gas supply pipe 91 Oxygen supply pipe 92

Claims

1. A tubular body having a linear internal space with a fluid supply portion and a discharge portion at both ends in the length direction, a guiding body accommodated in the internal space of the tubular body, having a flow passage penetrating in the longitudinal direction, and having a predetermined size gap provided between an outer peripheral portion and an inner peripheral portion forming the internal space of the tubular body, wherein the guiding body has a nut block formed by connecting a required number of nuts in the thickness direction, and the flow passage is formed by screw holes of the respective nuts A static mixer for fluids.

2. The guiding body is formed by arranging a plurality of the nut blocks in parallel The static mixer for fluids according to Claim 1.

3. The guiding body has a plurality of the nut blocks twisted integrally in the circumferential direction around the axis The static mixer for fluids according to Claim 2.

4. A tubular body having a linear internal space with a fluid supply portion and a discharge portion at both ends in the length direction, a guiding body accommodated in the internal space of the tubular body, having a flow passage penetrating in the longitudinal direction, and having a predetermined size gap provided between an outer peripheral portion and an inner peripheral portion forming the internal space of the tubular body, wherein the guiding body is formed by rolling a metal plate into a cylindrical shape and having the flow passage provided therein A static mixer for fluids.

5. Through holes penetrating the front and back are provided at predetermined positions of the metal plate The static mixer for fluids according to Claim 4.

6. Rising portions protruding from the front surface, the back surface, or both the front and back surfaces are provided along the edge of the through hole The static mixer for fluids according to Claim 5.

7. A spiral protrusion or groove is provided on the inner peripheral wall of the tubular body from the supply portion toward the discharge portion The static mixer for fluids according to Claim 1 or Claim 4.

8. A straight groove is provided in the length direction on the inner peripheral wall of the tubular body from the supply portion toward the discharge portion The static mixer for fluids according to Claim 1 or Claim 4.

9. Between the inner peripheral portion of a tubular body having a linear internal space with a fluid supply portion and a discharge portion at both ends in the length direction and the outer peripheral portion of the guiding body arranged inside the tubular body, the guiding body having a nut block formed by connecting a required number of nuts in the thickness direction, and in the gap and the flow passage formed by screw holes of the respective nuts, a fluid is directed from the supply portion toward the discharge portion, and is circulated through both routes of the flow in the length direction of the tubular body passing through the gap and the flow passage and the in-and-out flow that enters and exits between the gap and the flow passage A method for mixing fluids.

10. A method for mixing fluids, comprising: an inner peripheral portion of a tubular body having a linear internal space with fluid supply and discharge portions at both ends in the longitudinal direction; a guiding body disposed inside the tubular body, wherein a gap is formed between the guiding body, which is formed by rolling a metal plate into a cylindrical shape and has a flow passage provided therein, and an outer peripheral portion of the guiding body; and a flow in the longitudinal direction of the tubular body, which passes through the gap and the flow passage, and a reciprocating flow that enters and exits between the gap and the flow passage, for guiding the fluid from the supply portion to the discharge portion. A method for mixing fluids.

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