Static mixer for fluids and method for mixing fluids

Abstract

Provided is a static mixer for fluids that can more efficiently mix and activate a fluid such as a flammable gas and air, which is used in a pressure welding torch or the like. [Solution] The static mixer A3 for fluids comprises a tubular body 1 having a linear internal space 4 with a fluid supply pipe 90a and a fluid discharge pipe 90b at both ends in the longitudinal direction, and a guide body 3 housed in the internal space 4 of the tubular body 1b, with spiral blades 30a, 30b provided on the outer peripheral surface 39 from the supply pipe 90a to the discharge pipe 90b, and a gap 400 of a predetermined size provided between the tips of the spiral blades 30a, 30b and the inner peripheral surface 19 that forms the internal space 4 of the tubular body 1b.

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, such as flammable gas and air, which are used in pressure welding torches and the like, and which can more efficiently mix and activate the fluids. [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 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 blades made of a perforated plate with edge portions and a plurality of perforations inside a cylindrical passage pipe through which a fluid flows, the blades 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, and the edge portions of the blades have approximately the same shape as the edge portions of the blades, 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 one another at equal intervals in the lateral direction to the axial direction of the passage pipe. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-22967 Summary of the Invention [Problem to be solved by the invention]

[0005] The description of this mixing element claims that it has a simple structure, is easy to manufacture, can be manufactured at low cost, and has high performance. However, in terms of practical performance, the perforated plate structure creates extremely large fluid resistance, making it difficult to achieve high fluid speeds, preventing efficient mixing and resulting in insufficient activation.

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

[0007] [1] In order to achieve the above object, the present invention provides a static mixer for fluids, which is 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 in which a ridge or groove is provided spirally on the inner periphery forming the central flow passage 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 path provided in a tubular body. The fluid is supplied into the central flow path from a fluid supply port at one end of the central flow path in the longitudinal direction, and is discharged to the outside of the central flow path from a fluid discharge port at the other end. A portion of the fluid circulating inside the central flow path from the supply port to the discharge port flows approximately straight through the approximate center of the central flow path.

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

[0010] [2] In the static mixer for fluids of the present invention, in the above [1], in a structure in which the spiral ridge is provided on the inner periphery, 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 on the inner periphery in the longitudinal direction of the tubular body.

[0011] In this case, a spiral ridge is provided on the inner periphery, and notches formed by cutting only the ridge are positioned on a predetermined straight line in the longitudinal direction of the pipe, or the ridge is cut out and grooves overlapping the notches are provided on the inner periphery in the longitudinal direction of the pipe, so that the flowing fluid generates new linear flows that pass through the notches, or new linear flows that pass through the notches and the overlapping grooves. This increases the number of points where the newly generated linear flows collide with the spirally flowing fluid, in addition to the linear flow of fluid passing approximately at the center of the central flow path, thereby more efficiently mixing the fluids.

[0012] [3] In the static mixer for fluids of the present invention, in the above [1], in a structure in which the spiral groove is provided on the inner periphery, a groove intersecting the spiral groove may be provided on the inner periphery in the length direction of the tubular body.

[0013] In this case, a spiral groove is provided on the inner periphery, and grooves that intersect with this spiral groove are provided in the length direction of the pipe, so that a new linear flow is generated in the flowing fluid through the inner periphery groove. As a result, in addition to the linear flow of fluid passing through approximately the center of the central flow path, the newly generated linear flow and the spiral flowing fluid have more points of collision with each other, so that the fluid is 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, having a spiral ridge on the outer periphery extending from the supply section to the discharge section, with a gap of a predetermined size provided 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 that defines the internal space of the tubular body and the tip of the rib of the guide body contained in the internal space, and through a space formed along the rib. The fluid is supplied to the gap and the interior of the space from a fluid supply port at one end of the internal space in the longitudinal direction, and is discharged to the outside of the internal space from a discharge port at the other end.

[0016] At this time, part of the fluid flowing through the gap and the space from the supply part to the discharge part flows in a substantially straight line in the gap, while the other part flows in a spiral in the space. The fluid flowing in a substantially straight line in the gap and the fluid flowing in a spiral 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], such that the notch formed by cutting out only the ridges is located on a predetermined straight line in the longitudinal direction of the guide body, or the ridges are notched and grooves overlapping the notches formed by cutting out the ridges are provided on the outer periphery in the longitudinal direction of the guide body.

[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 overlapping the cutouts formed by cutting out the protrusions are formed on the outer periphery in the longitudinal direction of the guide body, so that the circulating fluid generates new flows that flow linearly through each notch, or that flow linearly through each notch and the grooves that overlap them.

[0019] This increases the number of points at which the linear flow of fluid passing through the gap and the linear flow passing through the groove collide with the spirally flowing fluid, thereby making the fluids mix more efficiently.

[0020] [6] The static mixer for fluid of the present invention may be configured as described above in [4] or [5], wherein the gap between the tip of the ridge and the inner periphery of the tubular body 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 section and near the discharge section. Therefore, when fluid is supplied from the supply section at a constant pressure, the difference in size of the gap makes it easier for the internal pressure to fluctuate, for example, with the pressure being higher where the gap is narrower, and it is expected that more efficient mixing will be possible.

[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 pipe, in which the fluid flows from a fluid supply section to a fluid discharge section in two ways: a linear flow in the length direction of the pipe through the central flow path, and a spiral flow along the inner periphery 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 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.

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

[0025] 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.

[0026] A part of the fluid flowing through the space from the supply part to the discharge part flows in a substantially straight line in the longitudinal direction of the pipe, while another 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.

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

[0028] In this case, compared to [7] or [8], the number of fluid routes that intersect with the spiral flow increases, and the number of collision points of the fluid in each route also increases, allowing for more efficient mixing of the fluid.

[0029]

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

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

[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. [Effects 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 flammable gas and air used in, for example, a pressure welding torch. [Brief explanation of the drawings]

[0033] [Figure 1] FIG. 1 is an explanatory diagram of a pressure welding torch using the static fluid mixer of the present invention. [Figure 2] 1 is an explanatory vertical cross-sectional view of a static mixer for fluids according to the present invention. [Figure 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. [Figure 5] FIG. 2 is an explanatory view 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 view showing a second modified example of the second embodiment of the static mixer for fluid of the present invention. [Figure 8] 10 is an explanatory diagram showing a variation of the use position of the pressure welding torch of the static mixer for fluid of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[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. The pressure welding torch 9 has a gas inlet pipe 90. The gas inlet pipe 90 consists 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, each having a valve (reference numeral omitted), are connected to the base inlet pipe 90a so that they can merge.

[0035] A static fluid mixer A according to the present invention (a static fluid mixer A3, 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 tip of the front introduction pipe 90b, and burner tubes 94 and 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 and 95, facing inward (towards the center on the same plane).

[0036] (Static mixer for fluids A1) Fig. 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 includes a tubular body 1 made of metal (e.g., brass). The tubular body 1 has a predetermined length and an outer shape of a hexagonal prism. Inside the tubular body 1, an inner circumferential surface 19 (inner circumferential portion) is formed that forms a central flow path 2 that 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, which are 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 and 10b forming ridges are provided at a predetermined pitch on the inner peripheral surface 19 over the entire length of the central flow path 2. The helical blades 10a and 10b are double screws, and by having a wider pitch than a single screw, the fluid can flow more easily at high speeds without resistance. Note that it is also possible to use a structure in which spiral grooves (not shown) are provided in the same way, without providing the helical blades 10a and 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 more multiple screw may also be used.

[0040] Furthermore, the cross-sectional shape of the grooves (or the portions 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 ridges is not particularly limited.

[0041] Furthermore, the helical angles of the helical blades 10a, 10b and the helical grooves are not particularly limited. If the helical angle relative to the axis of the tubular body 1 is too large, the fluid flowing inside will not easily form a spiral flow, the fluid flow speed will tend to slow down, and the fluid pressure will not easily increase when fluid assemblies collide with each other. This will have a negative effect on fluid activation (clustering).

[0042] On the other hand, if the helical angle with respect to the axis of the tubular body 1 is too small, a helical flow is more likely to occur, the fluid flow speed increases, and the pressure when fluids collide 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 will be 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 longitudinal cross-sectional explanatory view of the static mixer for fluid A1, and Fig. 3(b) is an explanatory view showing the flow of fluid at the cross-sectional line position in (a) during mixing.

[0044] In the following description of mixing using static fluid mixers A1 to A5, the fluid to be mixed is described using, as an example, acetylene gas (C2H2) and oxygen gas (O2) mixed at a predetermined ratio in this embodiment, 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. Furthermore, the use of fluids is not limited to gases used in heating equipment such as various industrial torches, and the mixer can also be used to mix 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 further upstream, 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 most 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 surface 19 of the tubular body 1 that forms the central flow path 2 and along the helical blades 10a and 10b, and is guided by the helical blades 10a and 10b to become a spiral flow (flow g2 in Figure 3(b)) that flows in a spiral pattern.

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

[0049] Furthermore, 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 has grooves 11 of a predetermined width and depth provided in the inner circumferential surface 19 of the tubular body 1a in the longitudinal direction.

[0051] The grooves 11 are provided parallel to one another at four 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 blade 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] Furthermore, in this embodiment, each groove 11 is formed by cutting out the inner circumferential surface 19 and the helical blades 10a, 10b, but this is not limiting, and for example, grooves 11 may be formed by cutting out only the helical blades 10a, 10b without forming grooves on the inner circumferential surface 19. Note that in a structure in which helical blades 10a, 10b are not provided but similar helical grooves (not shown) are provided, grooves 11 may be formed 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 longitudinal cross-sectional explanatory view of the static mixer for fluid A2, and Fig. 4(b) is an explanatory view 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 spirally in the direction g2 cross each other in their flow directions, so they collide repeatedly at the boundary between them, 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 path 2 newly generates two types of flows: a linear flow that passes through the notches 13 of each of the spiral blades 10a and 10b, and a linear flow that passes through each of the notches 13 and overlaps with the grooves 11 (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 path 2, four linear flows g3 are added, further increasing the number of points at which the flows collide with the spiral flow g2. This makes the fluid mixing more efficient.

[0056] (Static mixer for fluids A3) Fig. 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 tubular body 1b. The tubular body 1b has a predetermined length and an outer shape of a hexagonal prism. Inside the tubular body 1b, an inner circumferential surface 19 (inner circumferential portion) is formed that forms an inner space 4 that is circular in the center and linear in the length direction.

[0057] In the tubular body 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 tubular body 1b 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 communicate with the internal space 4.

[0058] The guide body 3 is housed in the center of the internal space 4. The guide body 3 is a linear, approximately round rod with a predetermined diameter. The guide body 3 is provided with conical guide sections 31 and 32 at both ends in the longitudinal direction to assist the flow of fluid. The guide body 3 is fixed to the base inlet pipe 90a and the tip inlet pipe 90b in a structure that allows fluid to flow, with the guide sections 31 and 32 housed in the supply path 901 and the discharge path 902.

[0059] Additionally, helical blades 30a, 30b forming ridges are provided at a predetermined pitch along the entire length of the outer peripheral surface 39 of the guide body 3. The helical blades 30a, 30b are double screws, and by having a wider pitch than a single screw, the fluid can flow more easily at high speeds without resistance. Note that instead of providing the helical blades 30a, 30b, a structure can also be used in which grooves (not shown) are provided in a similar spiral shape.

[0060] As a result, a space 40 is provided between the guide body 3 and the inner peripheral surface 19. The space 40 is composed of a space (reference numeral omitted) between the spiral blades 30a and 30b and a gap 400 of a predetermined width provided between the spiral blades 30a and 30b and the inner peripheral 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 and 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 longitudinal cross-sectional explanatory view of the static mixer for fluid A3, and Fig. 5(b) is an explanatory view 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 for fluid A3, and is supplied to the internal space 4 provided in the center of the tubular body 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 tubular body 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 is guided by the helical blades 30a, 30b to become a helical flow (flow g4 in Figure 5(b)) that flows in a spiral pattern.

[0064] The fluid flows in a substantially straight line g5 along the inner peripheral surface 19 of the tubular body 1b and the gap 400, and in a spiral direction g4. The two fluids then collide with each other repeatedly at the boundary between them, resulting in turbulent mixing. 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 A3.

[0065] Furthermore, 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) Fig. 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 has grooves 34 of a predetermined width and depth provided in the longitudinal direction on the outer peripheral surface 39 of the guide body 3a.

[0067] The grooves 34 are provided parallel to one another at 90° intervals in four locations around 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] Furthermore, in this embodiment, each groove 34 is formed by cutting out the outer peripheral surface 39 and the helical blades 30c, 30d, but this is not limiting, and for example, grooves 34 may be formed by cutting out only the helical blades 30c, 30d without forming grooves on the inner peripheral surface 39. Note that in a structure in which helical blades 30c, 30d are not provided but similar helical grooves (not shown) are provided, grooves 34 may be formed so as to intersect with the helical grooves 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 longitudinal cross-sectional explanatory view of the static mixer for fluid A4, and Fig. 6(b) is an explanatory view 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. 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 spirally in the direction g4 cross each other in their flow directions, so they collide repeatedly at the boundary between them, 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] Furthermore, in the static mixer for fluid A4, new flows (flow g6 in FIG. 6(b)) occur in the fluid flowing through the space 40, including a linear flow that passes through each notch 33 of each of the spiral blades 30c, 30d and a linear flow that passes through each notch 33 and overlaps with each groove 34. As a result, four linear flows g6 are added in addition to the linear flow g5 of the fluid passing through the gap 400, and the number of collision points between the flows g6 and the spiral flow g4 is further increased. This allows for more efficient mixing of the fluid.

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

[0073] The guide body 3b is housed 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 through them, with the thicker end positioned on the supply path 901 side.

[0074] Additionally, spiral blades 30e and 30f are provided at a predetermined pitch along the entire length of the outer peripheral surface 39a of the guide body 3b. The spiral blades 30e and 30f are double screws, and by having a wider pitch than a single screw, the fluid can flow more easily at high speeds without resistance. Note that instead of providing the spiral blades 30e and 30f, a structure can also be used in which spiral grooves (not shown) are provided.

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

[0076] (action) The operation of the static mixer for fluid 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 therefore its actions are similar to those of the static mixer for fluid A3.

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

[0078] Furthermore, the space 41 near the supply path 901 in the space 40a between the tips of the spiral blades 30e, 30f and the inner circumferential surface 19 of the tubular body 1b and the space 42 near the discharge path 902 is different in size, 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 to be higher in the narrow gap (space 41), and more efficient mixing can be expected.

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

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

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

[0082] The static fluid mixers A1 to A4 are not limited to use only in the pressure welding torches, but can also be used as gas mixers placed near the upstream side of the nozzle of other heating appliances, such as gas burners used for welding.

[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. 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 blades 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 pipe having a linear central flow passage with a fluid supply section and a fluid discharge section at both ends in the longitudinal direction, a ridge or groove is provided spirally 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 periphery, 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 out and a groove overlapping the notch is provided on the inner periphery in the longitudinal direction of the tube.

2. The 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 that intersects with the spiral groove is provided on the inner periphery in the length direction of the tube.

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

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

5. The notch formed 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 notch formed by cutting out the protrusion is provided on the outer periphery in the length direction of the guide body.

5. The 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. The 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 length direction of the pipe through the central flow path, and a spiral flow along the inner periphery that forms the central flow path. Fluid mixing methods.

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

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

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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