Stationary type mixer for fluid and fluid mixing method

Abstract

To provide a stationary type mixer for a fluid, that more efficiently mixes and activates a fluid, such as flammable gas and air, used in a pressure-welding torch or the like.SOLUTION: A stationary type mixer A3 for a fluid comprises: a pipe body 1 provided with a straight internal space 4 having a supply pipe 90a and a discharge pipe 90b of a fluid at both ends in a length direction; and a guide body 3 which is accommodated in the internal space 4 of the pipe body 1b, is provided with spiral blades 30a, 30b from the supply pipe 90a toward the discharge pipe 90b on an outer peripheral surface 39, and further, which is provided with clearances 400 of a predetermined size in between a tip of the spiral blades 30a, 30b and an internal peripheral surface 19 forming the internal space 4 of the pipe body 1b.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a static mixer for fluids and a method for mixing fluids, and more particularly to a static mixer for fluids and a method for mixing fluids, which can more efficiently mix and activate a fluid such as a flammable gas and air used in, for example, a pressure welding torch. [Background technology]

[0002] By activating a gas by mixing multiple different types of gases or by stirring a single gas, for example, if the gas contains a flammable gas, it is possible to make the combustion more efficient and increase the combustion temperature. An example of a gas mixer used in this case is the mixing element disclosed in Patent Document 1.

[0003] The conventional mixing element of Patent Document 1 has a plurality of fan-shaped, spiral blade bodies made of a perforated plate having edge portions and having a plurality of perforations within a cylindrical passage pipe through which a fluid flows, the blade bodies are arranged at intervals from one another, and openings are formed in the center of the passage pipe over the entire axial length of the passage pipe, the edge portions of the blade bodies have approximately the same shape as the edge portions of the blade bodies, and are arranged in the perforated portions of the passage pipe so as to penetrate the pipe wall of the passage pipe and be parallel to each other at equal intervals laterally to the axial direction of the passage pipe. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-22967 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the description of this mixing element, it is said to have the advantages of being simple in structure, easy to manufacture, inexpensive to manufacture, and high performance. However, in terms of practical performance, there are problems in that the fluid resistance due to the perforated plate is extremely large due to the structure, making it difficult to achieve a high fluid speed, making it difficult to mix efficiently, and insufficient activation.

[0006] The present invention has been made in view of the above points, and has as its object to provide a static mixer for fluids and a method for mixing fluids, which can more efficiently mix and activate fluids such as flammable gas and air used in, for example, pressure welding torches. [Means for solving the problem]

[0007] [1] In order to achieve the above object, the present invention is a static mixer for fluids, comprising a tubular body having a linear central flow passage with a fluid supply section and a fluid discharge section at both ends in the longitudinal direction, and an inner periphery forming the central flow passage is provided with a spiral ridge or groove extending from the supply section to the discharge section.

[0008] The static mixer for fluid of the present invention is capable of circulating a fluid through a linear central flow passage provided in a tubular body. The fluid is supplied to the inside of the central flow passage from a fluid supply portion at one end of the central flow passage in the longitudinal direction, and is discharged to the outside of the central flow passage from a discharge portion at the other end. A portion of the fluid circulating inside the central flow passage from the supply portion to the discharge portion flows approximately straight through approximately the center of the central flow passage.

[0009] Another part of the fluid flows along the inner circumference that forms the central flow path. At this time, the fluid is guided by the ridges or grooves that are provided in a spiral shape on the inner circumference and flows in a spiral. 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 them, becoming turbulent and mixed, and is discharged from the discharge section.

[0010] [2] In the static mixer for fluids of the present invention described above in [1], in a structure in which the inner periphery has a spiral ridge, a notch formed by cutting out only the ridge may be provided on a predetermined straight line in the longitudinal direction of the tubular body, or the ridge may be cut out and a groove overlapping the notch may be provided in the inner periphery in the longitudinal direction of the tubular body.

[0011] In this case, a spiral rib is provided on the inner circumference, and notches formed by cutting only the rib are provided on a predetermined straight line in the longitudinal direction of the tube, or the rib is cut and grooves overlapping with the notches are provided on the inner circumference in the longitudinal direction of the tube, so that the fluid passing through either the rib or the groove is linearly formed. This increases the number of collision points between the spirally flowing fluid and the newly generated linear flows in addition to the linear flow of fluid passing through the approximate center of the central flow passage, thereby more efficiently mixing the fluids.

[0012] [3] The static mixer for fluids of the present invention, in the above-mentioned [1], in a structure in which the spiral groove is provided on the inner periphery, may be configured such that a groove intersecting the spiral groove is provided on the inner periphery in the longitudinal direction of the tubular body.

[0013] In this case, a spiral groove is provided on the inner circumference, and a groove that intersects with this spiral groove is provided in the length direction of the tube, so that a new linear flow is generated in the flowing fluid through the groove on the inner circumference. As a result, in addition to the linear flow of fluid passing through approximately the center of the central flow passage, the newly generated linear flow has more points of collision with the spirally flowing fluid, so that the fluids are mixed more efficiently.

[0014] [4] In order to achieve the above object, the present invention provides a static mixer for fluids, comprising a tubular body having a linear internal space with a fluid supply section and a fluid discharge section at both ends in the longitudinal direction, and a guide body housed in the internal space of the tubular body, the guide body having a spiral ridge on its outer periphery extending from the supply section to the discharge section, and a gap of a predetermined size between the tip of the ridge and the inner periphery forming the internal space of the tubular body.

[0015] The static mixer for fluid of the present invention can circulate a fluid through a gap between the inner periphery forming the internal space of the tube and the tip of the ridge of the guide housed in the internal space, and through a space formed along the ridge. The fluid is supplied from a fluid supply part at one end of the internal space in the length direction to the gap and the space, and is discharged from a discharge part at the other end to the outside of the internal space.

[0016] At this time, part of the fluid flowing through the gap and the space from the supply part to the discharge part flows approximately straight in the gap, while the other part flows spirally in the space. The fluid flowing approximately straight in the gap and the fluid flowing spirally in the space repeatedly collide with each other at the boundary between them, becoming turbulent and mixed, and then discharged from the discharge part.

[0017] [5] The static mixer for fluids of the present invention may be configured as described above in [4], wherein a cutout formed by cutting out only the protrusion is positioned on a predetermined straight line in the longitudinal direction of the guide body, or wherein the protrusion is cut out and a groove overlapping the cutout formed by cutting out the protrusion is provided in the longitudinal direction of the guide body on the outer periphery.

[0018] In this case, the notches formed by cutting out only the protrusions are positioned on a predetermined straight line in the longitudinal direction of the guide body, or the protrusions are cut out and grooves are formed in the longitudinal direction of the guide body on the outer periphery that overlap with the cutouts formed by the protrusions.Therefore, in the flowing fluid, new flows are generated that flow in a straight line through each cutout, or that flow in a straight line through each cutout and the grooves that overlap with them.

[0019] This increases the number of points at which the linear flow of fluid passing through the grooves, in addition to the linear flow of fluid passing through the gaps, collide with the spirally flowing fluid, resulting in more efficient mixing of the fluids.

[0020] [6] The static mixer for fluid of the present invention, in the above-mentioned [4] or [5], may be configured such that the gap between the tip of the protrusion and the inner peripheral part of the tube is formed to have different sizes near the supply part and near the discharge part.

[0021] In this case, the size of the gap between the tip of the protrusion and the inner circumference of the tube differs near the supply part and near the discharge part. Therefore, when fluid is supplied from the supply part at a constant pressure, the difference in the size of the gap will cause the internal pressure to fluctuate, for example, the pressure will be higher where the gap is narrow, and it is expected that more efficient mixing will be achieved.

[0022] [7] In order to achieve the above object, the present invention provides a method for mixing fluids in a central flow path of a tubular body, in which fluids are circulated from a fluid supply section to a fluid discharge section in two ways: a linear flow in the longitudinal direction of the tubular body passing through the central flow path, and a spiral flow along the inner circumference that forms the central flow path.

[0023] The fluid mixing method of the present invention can create and circulate a linear flow of fluid in the length direction of the pipe through the central flow path from the fluid supply section to the fluid discharge section. Also, a spiral flow (which can be called a swirling flow) of fluid can be created and circulated along the inner periphery that forms the central flow path. Then, 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.

[0024] [8] In order to achieve the above object, the present invention provides a method for mixing fluids in a space between the outer periphery of a guide body arranged inside a tube and the inner periphery of the tube, in which the fluid flows from the supply section to the discharge section in two ways: a linear flow passing through the space in the longitudinal direction of the tube, and a spiral flow passing along the outer periphery.

[0025] The fluid mixing method of the present invention can create and distribute a linear flow of fluid in the longitudinal direction of the tube from the fluid supply section to the fluid discharge section in the space between the outer periphery of a guide body disposed inside the tube and the inner periphery of the tube, and can also create and distribute a spiral flow of fluid along the outer periphery of the guide body.

[0026] A part of the fluid flowing from the supply part to the discharge part inside the space flows substantially straight in the longitudinal direction of the tube, and another part flows while describing a spiral in the space. The fluid flowing substantially straight inside the space and the fluid flowing in a spiral inside the space repeatedly collide with each other at the boundary between them, becoming turbulent and being mixed.

[0027] [9] In the fluid mixing method of the present invention as described above in [7] or [8], the fluid can also be circulated in a direction intersecting the spiral flow and in the longitudinal direction of the tube.

[0028] In this case, compared to [7] or [8], the number of fluid routes that intersect with the spiral flow is increased, and the number of collision points of the fluid in each route is also increased, making it possible to mix the fluids more efficiently.

[0029]

[10] In the fluid mixing method of the present invention described above in [7] or [8], different types of fluids can also be circulated simultaneously inside the tube.

[0030] In this case, different types of fluids are simultaneously circulated inside the pipe, making it possible to mix any combination of fluids. This makes the device extremely useful as a static mixer for fluids, as it can flexibly meet the mixing requirements in a variety of fields.

[0031] In the present invention, the terms mixer and mixing are used to mean both mixing of a plurality of different types of fluids and stirring of a single fluid. Effect of the Invention

[0032] The present invention can provide a static mixer for fluids and a method for mixing fluids, which can more efficiently mix and activate a fluid such as a combustible gas and air used in, for example, a pressure welding torch. [Brief description of the drawings]

[0033] [Figure 1] FIG. 2 is an explanatory diagram of a pressure welding torch using the static fluid mixer of the present invention. [Diagram 2] FIG. 2 is a vertical cross-sectional view illustrating a static mixer for fluid of the present invention. [Diagram 3] FIG. 1 is an explanatory diagram showing a first embodiment of a static mixer for fluid of the present invention. [Figure 4] FIG. 2 is an explanatory diagram showing a modified example of the first embodiment of the static mixer for fluid of the present invention. [Diagram 5] FIG. 2 is an explanatory diagram showing a second embodiment of the static mixer for fluid of the present invention. [Figure 6] FIG. 2 is an explanatory diagram showing a first modified example of the second embodiment of the static mixer for fluid of the present invention. [Figure 7] FIG. 2 is an explanatory diagram showing a second modified example of the second embodiment of the static mixer for fluid of the present invention. [Figure 8] FIG. 1 is an explanatory diagram showing a variation of the location of use in the pressure welding torch of the static mixer for fluid of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] The embodiment of the present invention will be described in more detail with reference to FIGS. 1 is used to heat the pressure welding portion of steel materials for pressure welding of steel materials, etc. The pressure welding torch 9 has a gas inlet pipe 90. The gas inlet pipe 90 is made up of a base inlet pipe 90a and a tip inlet pipe 90b, and a combustible gas supply pipe 91 and an oxygen supply pipe 92 having valves (reference numbers omitted) are connected to the base inlet pipe 90a so that they can merge.

[0035] A static mixer A for fluid according to the present invention (a static mixer A3 for fluid, which will be described later, is shown in FIG. 2 for convenience) is attached between the base introduction pipe 90a and the front introduction pipe 90b. A U-shaped branch pipe 93 is connected to the front end of the front introduction pipe 90b, and burner tubes 94, 95 are connected to both ends of the branch pipe 93 in opposing positions. A plurality of nozzle tubes 96 are attached to each of the burner tubes 94, 95, facing inward (towards the center on the same plane).

[0036] (Static mixer for fluids A1) 3 shows a static mixer for fluid A1 which is a first embodiment of the static mixer for fluid of the present invention. The static mixer for fluid A1 is equipped with a tubular body 1 made of metal (e.g., brass). The tubular body 1 has a predetermined length and has a hexagonal prism-like outer shape. Inside the tubular body 1, an inner circumferential surface 19 (inner circumferential portion) is formed which forms a central flow passage 2 which is circular in shape and linear in the length direction.

[0037] In the tubular body 1, the insides of the base inlet pipe 90a and the tip inlet pipe 90b connected to the central flow path 2 at both ends in the longitudinal direction form a supply path 901 for supplying a fluid and a discharge path 902 for discharging the fluid. The tip of the base inlet pipe 90a is connected to the supply side of the tubular body 1 via a tapered screw (reference number omitted), and the tip of the tip inlet pipe 90b is connected to the discharge side via the same tapered screw (reference number omitted). As a result, the supply path 901 and the discharge path 902 are connected to the central flow path 2.

[0038] Additionally, helical blades 10a, 10b forming ridges are provided at a predetermined pitch on the inner circumferential surface 19 over the entire length of the central flow passage 2. The helical blades 10a, 10b are double screws, and by making the pitch wider than that of a single screw, the fluid can flow more easily at high speeds with less resistance. Note that it is also possible to adopt a structure in which grooves (not shown) are provided in a similar helical shape without providing the helical blades 10a, 10b.

[0039] In this case, the pitch of the helical blades 10a, 10b and the helical grooves is not particularly limited. In addition, although a double screw is used in this embodiment, a triple, quadruple or other multiple screw may be used.

[0040] Furthermore, the cross-sectional shape of the grooves (or the portion forming the grooves) is not particularly limited and may be, for example, semicircular, U-shaped, V-shaped, etc. Similarly, it goes without saying that the cross-sectional shape of the protrusions is not particularly limited.

[0041] Furthermore, the helical angle of the helical blades 10a, 10b and the helical grooves is not particularly limited. If the helical angle with respect to the axis of the tube body 1 is too large, the fluid flowing inside is less likely to form a helical flow, so the fluid flow speed tends to slow down and the fluid pressure during collisions with other fluids is less likely to increase. This is detrimental to the activation (clustering) of the fluid.

[0042] On the other hand, if the helical angle with respect to the axis of the tube 1 is too small, a helical flow is more likely to occur, the fluid flow speed increases, and the pressure when the fluid collides with itself tends to increase, which is advantageous for activating the fluid. The helical angle is set, for example, within the range of 10 to 60° (in practice, the angle is set appropriately depending on the amount of protrusion of the helical blades 10a, 10b and the depth of the helical grooves), but is not particularly limited.

[0043] (action) The operation of the static mixer for fluid A1 will be described with reference to Fig. 3. Fig. 3(a) is a vertical cross-sectional explanatory diagram of the static mixer for fluid A1, and Fig. 3(b) is an explanatory diagram showing the flow of fluid at the cross-sectional line position in (a) during mixing.

[0044] In the following description of mixing by the static mixers A1 to A5 for fluid, in this embodiment, acetylene gas (C2H2) and oxygen gas (O2) mixed at a predetermined ratio are taken as an example of the fluid to be mixed, but the present invention is not limited to this. Fluids that can be mixed include, for example, various gases, various liquids, and flowable solids such as various powders. In addition, the use of the fluid is not limited to gases used in heating devices such as various industrial torches, and can also be used for mixing various medical gases, for example.

[0045] First, during mixing, the acetylene gas and oxygen gas supplied to the static mixer for fluid A1 may be mixed primarily when they pass through the supply path 901 or upstream of that, or they may be mixed simultaneously after being supplied to the tubular body 1 (the same applies to the static mixers for fluid A2 to A5 described below).

[0046] The fluid, which is a mixture of acetylene gas and oxygen gas, passes through a supply path 901, which is a fluid supply section of the static mixer for fluid A1, and is supplied to a central flow path 2 provided in the center of the tubular body 1. Then, a part (or a large part) of the fluid becomes a substantially straight flow (flow g1 in FIG. 3(b)) along the central flow path 2.

[0047] Another part of the fluid flows along the inner circumferential surface 19 of the tubular body 1 that forms the central flow passage 2 and along the helical blades 10a, 10b, and is guided by the helical blades 10a, 10b to become a helical flow (flow g2 in FIG. 3(b)) that flows in a spiral pattern.

[0048] Then, inside the central flow path 2, the fluid flowing straight in the direction g1 and the fluid flowing in a spiral in the direction g2 cross each other in their flow directions, so they collide with each other repeatedly at the boundary between them, becoming turbulent and mixed. The fluid then passes through the discharge path 902, which is the discharge section, and is discharged to the outside of the static mixer for fluid A1.

[0049] In addition, the flow rate of the fluid during mixing is adjusted to be sufficiently high, so that the acetylene gas and oxygen gas that make up the fluid are efficiently mixed under high pressure and can be sufficiently activated.

[0050] (Static mixer for fluids A2) 4 shows a static mixer A2 for fluids, which is a modified example of the first embodiment of the static mixer for fluids of the present invention. In addition to the configuration of the static mixer A1 for fluids, the static mixer A2 for fluids has a groove 11 of a predetermined width and depth provided in the inner peripheral surface 19 in the longitudinal direction of the tube 1a.

[0051] The grooves 11 are provided in parallel to one another at four positions spaced at 90° intervals in the circumferential direction of the inner peripheral surface 19. Each groove 11 has a notch 13 formed by cutting out the spiral blades 10a, 10b at a position overlapping with the groove 11. The number of grooves 11 is not particularly limited and can be set as appropriate.

[0052] In addition, in this embodiment, each groove 11 is provided by cutting out the inner circumferential surface 19 and the helical blades 10a, 10b, but this is not limited thereto, and for example, the grooves may be provided by cutting out only the helical blades 10a, 10b without providing the grooves on the inner circumferential surface 19. In the case of a structure in which a groove (not shown) is similarly provided in a helical shape without providing the helical blades 10a, 10b, the grooves 11 may be provided so as to intersect with the helical grooves at the same depth.

[0053] (action) The operation of the static mixer for fluid A2 will be described with reference to Fig. 4. Fig. 4(a) is a vertical cross-sectional explanatory diagram of the static mixer for fluid A2, and Fig. 4(b) is an explanatory diagram showing the flow of fluid at the cross-sectional line position in (a) during mixing.

[0054] The static mixer for fluid A2 has the same action as the static mixer for fluid A1, due to the same configuration as the static mixer for fluid A1. That is, the fluid supplied from the supply path 901 and flowing straight through the central flow path 2 in the direction g1 and the fluid flowing in a spiral in the direction g2 cross each other in their flow directions, so they collide with each other repeatedly at the boundary portion, becoming turbulent and mixed, and are discharged to the outside of the static mixer for fluid A2 through the discharge path 902, which is the discharge section.

[0055] In the static mixer for fluid A2, the fluid flowing through the central flow passage 2 newly generates a linear flow passing through each notch 13 of each of the spiral blades 10a, 10b and a linear flow passing through each of the grooves 11 overlapping with each of the notches 13 (flow g3 in FIG. 4(b)). As a result, in addition to the linear flow g1 of the fluid passing through approximately the center of the central flow passage 2, four linear flows g3 are added, and the number of collision points with the spiral flow g2 is further increased. This makes it possible to mix the fluid more efficiently.

[0056] (Static mixer for fluids A3) 5 shows a static mixer for fluid A3 which is a second embodiment of the static mixer for fluid of the present invention. The static mixer for fluid A3 is equipped with a metal tube body 1b. The tube body 1b has a predetermined length and an outer shape of a hexagonal column. Inside the tube body 1b, an inner circumferential surface 19 (inner circumferential portion) is formed which forms an inner space 4 which is a circular hole shape at the center and linear in the length direction.

[0057] In the tube 1b, the insides of the base inlet pipe 90a and the tip inlet pipe 90b, which are connected to the internal space 4 at both ends in the longitudinal direction, form a supply path 901 for supplying a fluid and a discharge path 902 for discharging the fluid. The tip of the base inlet pipe 90a is connected to the supply side of the tube 1b via a tapered screw (symbol omitted), and the tip of the tip inlet pipe 90b is connected to the discharge side via the same tapered screw (symbol omitted). As a result, the supply path 901 and the discharge path 902 communicate with the internal space 4.

[0058] The guide body 3 is accommodated in the center of the internal space 4. The guide body 3 is a linear, approximately round bar shape having a predetermined diameter. The guide body 3 is provided with cone-shaped guide portions 31 and 32 that aid the flow of the fluid at both ends in the longitudinal direction. The guide body 3 is fixed to the base introduction pipe 90a and the tip introduction pipe 90b in a structure that allows the fluid to flow, with the guide portions 31 and 32 accommodated in the supply path 901 and the discharge path 902.

[0059] In addition, helical blades 30a, 30b forming ribs are provided at a predetermined pitch on the outer peripheral surface 39, which is the outer periphery of the guide body 3, over its entire length. The helical blades 30a, 30b are double screws, and by making the pitch wider than that of a single screw, the fluid can flow more easily at high speed with less resistance. Note that it is also possible to adopt a structure in which grooves (not shown) are provided in a similar helical shape without providing the helical blades 30a, 30b.

[0060] As a result, a space 40 is provided between the guide body 3 and the inner circumferential surface 19. The space 40 is composed of a space (reference numeral omitted) between the spiral blades 30a, 30b and a gap 400 provided with a predetermined width between the spiral blades 30a, 30b and the inner circumferential surface 19 that forms the internal space 4 of the tube body 1b over the entire length of the tips of the spiral blades 30a, 30b.

[0061] (action) The operation of the static mixer for fluid A3 will be described with reference to Fig. 5. Fig. 5(a) is a vertical cross-sectional explanatory diagram of the static mixer for fluid A3, and Fig. 5(b) is an explanatory diagram showing the flow of fluid at the cross-sectional line position in (a) during mixing.

[0062] The fluid, which is a mixture of acetylene gas and oxygen gas, passes through a supply path 901, which is a fluid supply section of the static mixer A3 for fluid, and is supplied to the internal space 4 provided in the center of the tube 1b. Then, a part of the fluid becomes a substantially straight flow (flow g5 in FIG. 5(b)) along the inner circumferential surface 19 of the tube 1b and the gap 400.

[0063] Another part of the fluid flows through the space 40 along the helical blades 30a, 30b and the inner circumferential surface 19, and becomes a helical flow (flow g4 in FIG. 5(b)) that is guided by the helical blades 30a, 30b and flows in a spiral pattern.

[0064] The substantially straight flow g5 along the inner peripheral surface 19 of the tubular body 1b and the gap 400 and the fluid flowing in a spiral direction g4 cross each other in the flowing direction, so they collide with each other repeatedly at the boundary portion, becoming turbulent and mixed. The fluid is then discharged to the outside of the static mixer for fluid A3 through the discharge passage 902, which is the discharge section.

[0065] In addition, the flow rate of the fluid during mixing is adjusted to be sufficiently high, so that the acetylene gas and oxygen gas that make up the fluid are efficiently mixed under high pressure and can be sufficiently activated.

[0066] (Static mixer for fluids A4) 6 shows a static mixer A4 for fluid, which is a first modified example of the second embodiment of the static mixer for fluid of the present invention. In addition to the configuration of the static mixer A3 for fluid, the static mixer A4 for fluid has a groove 34 of a predetermined width and depth provided in the length direction on the outer peripheral surface 39 of the guide body 3a.

[0067] The grooves 34 are provided in parallel to one another at four positions spaced 90° apart in the circumferential direction of the outer circumferential surface 39. Each groove 34 has a notch 33 formed by cutting out the spiral blade 30c, 30d at a position overlapping with the groove 34. The number of grooves 34 is not particularly limited and can be set as appropriate.

[0068] In the present embodiment, each groove 34 is provided by cutting out the outer circumferential surface 39 and the helical blades 30c, 30d, but this is not limiting, and for example, grooves 34 may be provided by cutting out only the helical blades 30c, 30d without providing grooves on the inner circumferential surface 39. In the case of a structure in which a groove (not shown) is similarly provided in a helical shape without providing the helical blades 30c, 30d, grooves 34 may be provided so as to intersect with the helical groove at the same depth.

[0069] (action) The operation of the static mixer for fluid A4 will be described with reference to Fig. 6. Fig. 6(a) is a vertical cross-sectional explanatory diagram of the static mixer for fluid A4, and Fig. 6(b) is an explanatory diagram showing the flow of fluid at the cross-sectional line position in (a) during mixing.

[0070] The static mixer for fluid A4 has the same action as the static mixer for fluid A3, due to the same configuration as the static mixer for fluid A3. That is, the fluid supplied from the supply path 901 and flowing straight through the gap 400 in the direction g5 and the fluid flowing in a spiral in the direction g4 cross each other in their flow directions, so they collide with each other repeatedly at the boundary portion, becoming turbulent and mixed, and are discharged to the outside of the static mixer for fluid A4 through the discharge path 902, which is the discharge section.

[0071] In the static mixer for fluid A4, the fluid flowing through the space 40 newly generates a linear flow passing through each notch 33 of each of the spiral blades 30c, 30d, and a linear flow passing through each of the grooves 34 overlapping with each of the notches 33 (flow g6 in FIG. 6(b)). As a result, in addition to the linear flow g5 of the fluid passing through the gap 400, four linear flows g6 are added, and the number of collision points with the spiral flow g4 is further increased. This makes it possible to mix the fluid more efficiently.

[0072] (Static mixer for fluids A5) 7 shows a static mixer A5 for fluid, which is a second modified example of the second embodiment of the static mixer for fluid of the present invention. The static mixer A5 for fluid has a tube body 1b having a structure similar to that of the static mixer A3 for fluid.

[0073] The guide body 3b is accommodated in the center of the internal space 4a of the tube body 1b. The guide body 3b is formed in a partial cone shape, and is fixed to the base introduction tube 90a and the tip introduction tube 90b in a structure that allows fluid to flow therethrough, with the thicker end positioned on the supply path 901 side.

[0074] In addition, helical blades 30e, 30f are provided at a predetermined pitch on the outer peripheral surface 39a of the guide body 3b over its entire length. The helical blades 30e, 30f are double screws, and by making the pitch wider than that of a single screw, the fluid can flow more easily at high speeds without resistance. It is also possible to use a structure in which a groove (not shown) is provided in a similar helical shape without providing the helical blades 30e, 30f.

[0075] A space 40a is provided between the guide body 3b and the inner peripheral surface 19 of the tube body 1b. The space 40a is composed of a space (reference numeral omitted) between the spiral blades 30e, 30f and a gap 400a provided with a predetermined width between the spiral blades 30e, 30f and the inner peripheral surface 19 that forms the internal space 4a of the tube body 1b over the entire length of the tips of the spiral blades 30e, 30f. As a result, the space 41 near the supply path 901 of the space 40a and the space 42 near the discharge path 902 are different in size, with the space 42 being larger.

[0076] (action) The operation of the static fluid mixer A5 will be described with reference to FIG. The static mixer for fluid A5 has a configuration substantially similar to that of the static mixer for fluid A3, and hence the action thereof is similar to that of the static mixer for fluid A3.

[0077] In other words, the fluid supplied from the supply passage 901 and flowing in a substantially straight line through the gap 400a along the inner circumferential surface 19 in the direction g5 in space 40a, and the fluid guided by the helical blades 30e, 30f and flowing in a spiral in the direction g4 cross each other in their flow directions, so they collide with each other repeatedly at the boundary portion, becoming turbulent and mixed, and are discharged to the outside of the static mixer for fluid A5 through the discharge passage 902, which is the discharge section.

[0078] In addition, the space 41 near the supply path 901 and the space 42 near the discharge path 902 in the space 40a between the tips of the spiral blades 30e, 30f and the inner circumferential surface 19 of the tube body 1b have different sizes, with the space 42 being larger. As a result, when a fluid is supplied from the supply path 901 at a constant pressure, the difference in size between the space 41 and the space 42 makes it easier for the internal pressure to fluctuate, for example, the pressure in the narrow gap (space 41) to become higher, and it is expected that more efficient mixing can be achieved.

[0079] Variations in the location of the static mixer for fluid A3 in a pressure welding torch will be described with reference to Fig. 8. For convenience, the static mixer for fluid A3 will be described as an example, but other static mixers for fluid A1, A2, and A4 can also be used in the same way.

[0080] The type shown in Fig. 8(a) is one in which acetylene gas and oxygen gas are separately supplied to the static mixer for fluid A3 and mixed inside the static mixer for fluid A3. The type shown in Fig. 8(b) is one in which only oxygen gas is mixed in the static mixer for fluid A3 and then mixed with acetylene gas in the base introduction pipe 90a.

[0081] 8(c) shows a type in which only acetylene gas is mixed in the static mixer A3 for fluid and then mixed with oxygen gas in the base inlet pipe 90a. In both types, an activated mixture of acetylene gas and oxygen gas is finally supplied from the front inlet pipe 90b.

[0082] The static fluid mixers A1 to A4 are not limited to use in the pressure welding torches described above, but can also be used as gas mixers arranged in the vicinity of the upstream side of the nozzle of other heating appliances, such as a gas burner used for welding, etc.

[0083] The terms and expressions used in the present specification and claims are merely for explanatory purposes and are not limiting in any way, and are not intended to exclude terms and expressions equivalent to the features described in the present specification and claims and parts thereof. In addition, it goes without saying that various modifications are possible within the scope of the technical idea of ​​the present invention. [Explanation of symbols]

[0084] A1 Static mixer for fluids 1. Body 2. Central Channel 90a Base introduction tube 901 Supply route 90b Tip introduction tube 902 Exhaust channel 10a, 10b Spiral blade A2 Static mixer for fluids 1a Body 11 Groove 13 Notch A3 Static mixer for fluids 1b Body 3 conductor 30a, 30b Spiral blade 39 Outer surface 4. Interior space 40 space 400 Gap A4 Static mixer for fluids 3a conductor 34 Groove 30c, 30d spiral blade 33 Notch A5 Static mixer for fluids 3b conductor 40a space 400a gap 41 Space section 42 Space section

Claims

1. In a tube having a linear central flow passage with a fluid supply section and a fluid discharge section at both ends in the length direction, a protrusion or groove is provided in a spiral shape from the supply section to the discharge section on the inner periphery forming the central flow passage. Static mixer for fluids.

2. In a structure in which the spiral ridge is provided on the inner circumference, a notch formed by cutting only the ridge is provided on a predetermined straight line in the longitudinal direction of the tube, or the ridge is cut and a groove overlapping the notch is provided on the inner circumference in the longitudinal direction of the tube.

2. A static mixer for fluids according to claim 1.

3. In the structure in which the spiral groove is provided on the inner periphery, a groove intersecting the spiral groove is provided on the inner periphery in the length direction of the tube.

2. A static mixer for fluids according to claim 1.

4. A tube having a linear internal space having a fluid supply portion and a fluid discharge portion at both ends in a longitudinal direction; a guide body that is accommodated in the internal space of the tube body, has a spiral protrusion on its outer periphery extending from the supply portion to the discharge portion, and has a gap of a predetermined size between the tip of the protrusion and an inner periphery that defines the internal space of the tube body. Static mixer for fluids.

5. A cutout portion obtained by cutting out only the protrusion is provided on a predetermined straight line in the length direction of the guide body, or the protrusion is cut out and a groove overlapping the cutout portion of the protrusion is provided on the outer periphery in the length direction of the guide body.

5. A static mixer for fluids according to claim 4.

6. The gap between the tip of the protrusion and the inner periphery of the pipe is formed to have different sizes near the supply portion and near the discharge portion.

6. A static mixer for fluids according to claim 4 or 5.

7. In the central flow path of the pipe, the fluid flows from the supply portion to the discharge portion 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 circumference that forms the central flow path. A method for mixing fluids.

8. In the space between the outer periphery of a guide disposed inside a tube and the inner periphery of the tube, the fluid flows from the supply section to the discharge section in two ways: a linear flow in the length direction of the tube passing through the space, and a spiral flow along the outer periphery. A method for mixing fluids.

9. The fluid is caused to flow in a direction intersecting the spiral flow and in the longitudinal direction of the tube.

9. The method for mixing fluids according to claim 7 or 8.

10. Different types of fluids are simultaneously circulated inside the tube.

9. The method for mixing fluids according to claim 7 or 8.

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