Stationary mixer for fluids and method for mixing fluids

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. More specifically, the present invention relates to a static mixer for fluids and a method for mixing fluids, which are used, for example, in pressure welding torches and the like and can more efficiently mix and activate fluids such as combustible gas and air. [Background Art]

[0002] Activating gas by mixing a plurality of different types of gases or stirring a single gas can, for example, if the gas contains combustible gas, improve combustion efficiency and increase the combustion temperature. A mixing element disclosed in Patent Document 1, for example, is known as a gas mixer used in this case.

[0003] The conventional mixing element of Patent Document 1 includes a plurality of fan-shaped spiral blades formed of a porous plate having edge portions and a plurality of perforations, arranged in a cylindrical passage pipe through which a fluid flows, the blades are arranged at intervals from each other, an opening is formed in a central portion of the passage pipe over the entire axial length of the passage pipe, the shape of the opening is substantially the same as that of the edge portions of the blades, and the edge portions of the blades are arranged in perforations of the passage pipe, penetrating the pipe wall portion of the passage pipe such that the edge portions are parallel to each other at equal intervals in the transverse direction relative to the axial direction of the passage pipe. [Prior Art Documents] [Patent Documents]

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

[0005] The specification claims that this mixing element has a simple structure, is easy to manufacture, has low manufacturing costs, and is high-performance. However, in terms of practical performance, the structure results in extremely high fluid resistance due to the perforated plate, making it difficult to achieve high fluid velocity, inefficient mixing, and insufficient activation.

[0006] The present invention was conceived in view of the above points, and aims to provide a stationary fluid mixer and a fluid mixing method that can more efficiently mix and activate a fluid such as a flammable gas and air, which are used in applications such as pressure welding torches. [Means for solving the problem]

[0007] [1] To achieve the above objective, the present invention provides a stationary fluid mixer in which a pipe has a linear central flow path having a fluid supply section and a fluid discharge section at both ends in the longitudinal direction, wherein the inner circumference forming the central flow path is provided with spiral projections or grooves extending from the supply section to the discharge section.

[0008] The stationary fluid mixer of the present invention can circulate fluid through a straight central channel provided in a pipe. The fluid is supplied into the central channel from a fluid supply section located at one end of the central channel in the longitudinal direction, and discharged to the outside of the central channel from a discharge section located at the other end. A portion of the fluid circulating within the central channel from the supply section to the discharge section flows substantially straight through the approximate center of the central channel.

[0009] Furthermore, another portion of the fluid flows along the inner circumference that forms the central channel. At this time, the fluid is guided by spiral-shaped protrusions or grooves on the inner circumference and flows in a spiral pattern. The fluid flowing straight through the central channel and the fluid flowing in a spiral pattern repeatedly collide with each other at their boundary, creating turbulence and mixing, which is then discharged from the discharge section.

[0010] [2] In the static fluid mixer of the present invention, in the structure in which the spiral projection is provided on the inner circumference of the inner circumference of the present invention, a notch is provided on a predetermined straight line in the longitudinal direction of the pipe body, by cutting out only the projection, or a groove overlapping the notch is provided on the inner circumference of the pipe body in the longitudinal direction of the pipe body in addition to cutting out the projection.

[0011] In this case, spiral ridges are provided on the inner circumference, and notches are provided on a predetermined straight line along the length of the pipe, or grooves overlapping the notches are provided on the inner circumference along the length of the pipe, in addition to the notches. As a result, new flows are generated in the circulating fluid: a linear flow through each notch, or a linear flow through each notch and the overlapping groove. 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 through approximately the center of the central channel, thus enabling more efficient fluid mixing.

[0012] [3] In the static fluid mixer of the present invention, in the structure in which the spiral groove is provided on the inner circumference, a groove intersecting the spiral groove may be provided on the inner circumference in the longitudinal direction of the pipe.

[0013] In this case, a spiral groove is provided on the inner circumference, and grooves intersecting this spiral groove are provided along the length of the pipe. As a result, a new linear flow is created in the circulating fluid through the groove on the inner circumference. This increases the number of points where the newly created linear flow collides with the spirally flowing fluid, in addition to the linear flow of fluid passing through approximately the center of the central channel, thus making the fluid mixing more efficient.

[0014] [4] In order to achieve the above objective, the present invention provides a stationary fluid mixer comprising: a pipe 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 pipe, having spiral projections on its outer circumference extending from the supply section to the discharge section, with a predetermined gap provided between the tip of the projection and the inner circumference forming the internal space of the pipe.

[0015] The stationary fluid mixer of the present invention allows fluid to flow through the gap between the inner circumference forming the internal space of the pipe and the tip of the projection of the guide body housed in the internal space, as well as the space formed along the projection, within the linear internal space of the pipe. The fluid is supplied into the gap and the space from a fluid supply section located at one end of the internal space in the longitudinal direction, and discharged to the outside of the internal space from a discharge section located at the other end.

[0016] At this time, a portion of the fluid flowing from the supply section to the discharge section through the gap and the interior space flows almost straight through the gap, while another portion flows in a spiral pattern within the space. The fluid flowing almost straight through the gap and the fluid flowing in a spiral pattern within the space repeatedly collide with each other at their boundary, creating turbulence, which is then mixed and discharged from the discharge section.

[0017] [5] In the static fluid mixer of the present invention, in the above [4], the notched portion in which only the protrusion is cut out is located on a predetermined straight line in the longitudinal direction of the guide body, or the protrusion is cut out and a groove overlapping the notched portion in which the protrusion is cut out is provided on the outer circumference in the longitudinal direction of the guide body.

[0018] In this case, the notches, which are cut out with 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 notches are provided on the outer circumference in the longitudinal direction of the guide body. As a result, new flows are generated in the flowing fluid, either flowing linearly through each notch, or flowing linearly through each notch and the overlapping grooves.

[0019] This increases the number of points where the linear flow of fluid through the grooves collides with the spirally flowing fluid, in addition to the linear flow of fluid through the gaps, resulting in more efficient fluid mixing.

[0020] [6] The stationary fluid mixer of the present invention may be configured such that, in [4] or [5] above, the gap between the tip of the protrusion and the inner circumference of the pipe body is formed to be of different sizes near the supply section and near the discharge section.

[0021] In this case, the gap between the tip of the protrusion and the inner circumference of the pipe body is of different sizes near the supply and discharge sections. Therefore, when fluid is supplied from the supply section at a constant pressure, the internal pressure is more likely to fluctuate due to the difference in gap size, for example, the pressure being higher where the gap is narrower. This is expected to enable more efficient mixing.

[0022] [7] To achieve the above objective, the present invention is a fluid mixing method in which, in the central flow channel of a pipe, the fluid flows from a fluid supply section to a discharge section via both a straight flow in the longitudinal direction of the pipe through the central flow channel and a spiral flow along the inner circumference forming the central flow channel.

[0023] The fluid mixing method of the present invention creates and circulates a straight flow of fluid along the length of the pipe through the central channel, from the fluid supply to the discharge. Furthermore, a spiral flow (or swirling flow) of fluid is created and circulated along the inner circumference that forms the central channel. The fluid flowing straight through the central channel and the fluid flowing in a spiral repeatedly collide with each other at the boundary between the two routes, resulting in turbulence and mixing.

[0024] [8] To achieve the above object, the present invention provides a fluid mixing method, wherein fluid flows from a fluid supply part to a discharge part through two flow routes in a space between an outer circumference of a guide body disposed inside a pipe body and an inner circumference of the pipe body, the two routes being a linear flow along a length direction of the pipe body passing through the space, and a spiral flow passing along the outer circumference.

[0025] In the fluid mixing method of the present invention, a linear flow of fluid along the length direction of the pipe body passing through the space can be generated and caused to flow from the fluid supply part to the discharge part in the space between the outer circumference of the guide body disposed inside the pipe body and the inner circumference of the pipe body. Furthermore, a spiral flow of fluid can be generated and caused to flow along the outer circumference of the guide body.

[0026] Part of the fluid flowing inside the space from the supply part to the discharge part flows substantially straight in the length direction of the pipe body, while another part flows while forming a spiral in the space. Then, the fluid flowing substantially straight inside the space and the fluid flowing while forming a spiral inside the space repeatedly collide with each other at their boundary portions, form turbulent flow, and are mixed.

[0027] [9] In the fluid mixing method of the present invention, in the above [7] or [8], fluid can be caused to flow in a direction intersecting the spiral flow and in the length direction of the pipe body.

[0028] In this case, compared with [7] or [8], more fluid routes intersecting the spiral flow are provided, so that the number of collision sites between fluids in each route also increases, and fluid mixing can be performed more efficiently.

[0029]

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

[0030] In this case, since different types of fluids are caused to flow simultaneously inside the pipe body, mixing of fluids in all combinations is achieved. Accordingly, the present invention can flexibly respond to mixing requirements in various fields, and is extremely useful as a static mixer for fluids.

[0031] In this invention, the terms mixer and mixing are used to encompass both the meaning of mixing multiple fluids of different types and the meaning of stirring a single fluid. [Effects of the Invention]

[0032] The present invention provides a stationary fluid mixer and a fluid mixing method that can more efficiently mix and activate a fluid such as a flammable gas and air, for use in applications such as pressure welding torches. [Brief explanation of the drawing]

[0033] [Figure 1] This is an explanatory diagram of a pressure welding torch that uses the fluid-operated stationary mixer of the present invention. [Figure 2] This is a longitudinal cross-sectional diagram illustrating the static fluid mixer of the present invention. [Figure 3] This is an explanatory diagram showing a first embodiment of the static fluid mixer of the present invention. [Figure 4] This is an explanatory diagram showing a modified example of the first embodiment of the static fluid mixer of the present invention. [Figure 5] This is an explanatory diagram showing a second embodiment of the static fluid mixer of the present invention. [Figure 6] This is an explanatory diagram showing a first modified example of a second embodiment of the static fluid mixer of the present invention. [Figure 7] This is an explanatory diagram showing a second modified example of a second embodiment of the static fluid mixer of the present invention. [Figure 8] This is an explanatory diagram showing variations in the application location of the pressure welding torch for the static fluid mixer of the present invention. [Modes for carrying out the invention]

[0034] Embodiments of the present invention will be described in more detail with reference to Figures 1 to 8. The welding torch 9 shown in Figure 1 is used to heat the welding area of ​​steel materials for welding purposes. The 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, both having valves (not shown), are connected to the base inlet pipe 90a so that they can be joined together.

[0035] A stationary fluid mixer A according to the present invention (shown in Figure 2 as stationary fluid mixer A3, which will be explained later) is installed between the base inlet pipe 90a and the tip inlet pipe 90b. A U-shaped branch pipe 93 is connected to the tip of the tip inlet pipe 90b, and burner pipes 94 and 95 are connected to opposite ends of the branch pipe 93. Multiple nozzles 96 are attached to the burner pipes 94 and 95, respectively, facing inward (towards the center on the same plane).

[0036] (Stationary mixer for fluids A1) Figure 3 shows a first embodiment of the static fluid mixer of the present invention, which is a static fluid mixer A1. The static fluid mixer A1 comprises a metal (for example, brass) tube 1. The tube 1 has a predetermined length and an outer shape of a hexagonal prism. Inside the tube 1, an inner circumferential surface 19 (inner circumference) is formed, which forms a central flow path 2 that is circular in shape and linear in the longitudinal direction at the center.

[0037] In the pipe body 1, the interiors 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 passage 901 for supplying fluid and a discharge passage 902 for discharging fluid. The tip of the base inlet pipe 90a is connected to the supply side of the pipe body 1 via a tapered screw (not shown), and the tip of the tip inlet pipe 90b is connected to the discharge side via a tapered screw (not shown). As a result, the supply passage 901 and the discharge passage 902 are in communication with the central flow path 2.

[0038] Furthermore, spiral blades 10a and 10b, which form protrusions along the entire length of the central flow path 2, are provided on the inner circumferential surface 19 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 is made to flow more easily and at higher speed with less resistance. Alternatively, instead of providing the spiral blades 10a and 10b, a structure with spiral grooves (not shown) can also be used.

[0039] The pitch of the helical blades 10a, 10b and the helical grooves in this case is not particularly limited. Furthermore, although a double screw is used in this embodiment, triple, quadruple, or other multi-layered screws may also be used.

[0040] Furthermore, the cross-sectional shape of the groove (or the part forming the groove) is not particularly limited and can be, for example, semi-circular, U-shaped, V-shaped, etc. Similarly, it goes without saying that the cross-sectional shape of the ridge is also not particularly limited.

[0041] Furthermore, the angle of the spiral in the spiral vanes 10a, 10b and the spiral groove is not particularly limited. If the spiral angle with respect to the axis of the pipe 1 is too large, spiral flow of the fluid circulating inside becomes difficult, so the fluid flow velocity tends to slow down, and the fluid pressure does not increase easily during collisions between fluids. This is therefore unfavorable for fluid activation (clustering).

[0042] Conversely, if the helical angle with respect to the axis of the pipe 1 is too small, helical flow is more likely to occur, resulting in a faster fluid flow velocity and higher pressure during collisions between fluids, which is advantageous for fluid activation. The helical angle is set within a range of, for example, 10 to 60° (in reality, the angle will be adjusted as appropriate, as the protrusion amount of the helical vanes 10a and 10b and the depth of the helical grooves also play a role), but it is not particularly limited.

[0043] (action) The operation of the stationary fluid mixer A1 will be explained with reference to Figure 3. Figure 3(a) is a cross-sectional diagram of the stationary fluid mixer A1, and Figure 3(b) is a diagram illustrating the fluid flow at the cross-sectional line position in (a) during mixing.

[0044] In the following description of mixing using the static fluid mixers A1 to A5, this embodiment uses acetylene gas (C2H2) and oxygen gas (O2) mixed in a predetermined ratio as an example of the fluid to be mixed, but is not limited to this. Examples of fluids that can be mixed include various gases, various liquids, and fluid solids such as various powders. Furthermore, the applications of the fluid are not limited to gases used in heating equipment such as various industrial torches, but can also be used for mixing various gases for medical purposes, for example.

[0045] First, during mixing, the acetylene gas and oxygen gas supplied to the static fluid mixer A1 may undergo primary mixing when passing through the supply passage 901, or upstream thereof, or they may be mixed simultaneously with the mixing process after being supplied to the pipe 1 (the same applies to the static fluid mixers A2 to A5 described below).

[0046] The fluid, a mixture of acetylene gas and oxygen gas, is supplied through the supply channel 901, which is the fluid supply section of the static fluid mixer A1, to the central flow channel 2 located in the center of the pipe 1. Then, a portion (or a large portion) of the fluid flows in a nearly straight line along the central flow channel 2 (flow g1 in Figure 3(b)).

[0047] Furthermore, another portion of the fluid flows along the inner circumferential surface 19 of the pipe 1 that forms the central flow path 2 and along the helical vanes 10a and 10b, and is guided by the helical vanes 10a and 10b to flow in a spiral pattern, becoming a helical flow (flow g2 in Figure 3(b)).

[0048] Then, the fluid flowing straight through the central channel 2 in the direction g1 and the fluid flowing in a spiral in the direction g2 intersect in their flow directions. As a result, they repeatedly collide at the boundary between them, creating turbulence and mixing, which is then discharged to the outside of the static fluid mixer A1 through the discharge channel 902, which is the discharge section.

[0049] Furthermore, since the fluid velocity during mixing is adjusted to be sufficiently high, the acetylene gas and oxygen gas that make up the fluid can be efficiently mixed under high pressure and fully activated.

[0050] (Stationary mixer for fluids A2) Figure 4 shows a modified example of the first embodiment of the static fluid mixer of the present invention, namely a static fluid mixer A2. In addition to the configuration of the static fluid mixer A1 described above, the static fluid mixer A2 has grooves 11 of a predetermined width and depth provided on the inner circumferential surface 19 in the longitudinal direction of the pipe 1a.

[0051] The grooves 11 are provided in four locations on the inner circumferential surface 19, parallel to each other and spaced at 90° intervals. In addition, each groove 11 is formed by cutting out the helical vanes 10a and 10b located at the position overlapping the groove 11 to create a notch 13. The number of grooves 11 is not particularly limited and can be set as appropriate.

[0052] Furthermore, in this embodiment, each groove 11 is provided by cutting out the inner circumferential surface 19 and the helical blades 10a and 10b, but this is not the only way to go. For example, the groove may be provided by cutting out only the helical blades 10a and 10b without providing a groove in the inner circumferential surface 19. If the structure is designed with grooves (not shown) arranged in a spiral shape instead of providing the helical blades 10a and 10b, the grooves 11 may be provided so as to intersect the spiral grooves at the same depth.

[0053] (action) The operation of the stationary fluid mixer A2 will be explained with reference to Figure 4. Figure 4(a) is a cross-sectional diagram of the stationary fluid mixer A2, and Figure 4(b) is a diagram illustrating the fluid flow at the cross-sectional line position in (a) during mixing.

[0054] The static fluid mixer A2 operates similarly to the static fluid mixer A1 in terms of its configuration and function. Specifically, the fluid supplied from the supply channel 901 flows straight through the central channel 2 in the direction g1, and the fluid flows in a spiral in the direction g2. Because their flow directions intersect, they repeatedly collide at the boundary, creating turbulence which is then mixed. The mixture is then discharged to the outside of the static fluid mixer A2 through the discharge channel 902.

[0055] Furthermore, in the stationary fluid mixer A2, the fluid flowing through the central channel 2 generates new flows: a linear flow through each notch 13 of each helical blade 10a and 10b, and a linear flow through each notch 13 and overlapping groove 11 (flow g3 in Figure 4(b)). As a result, in addition to the linear flow g1 of the fluid flowing approximately through the center of the central channel 2, four linear flows g3 are added, further increasing the number of collision points with the spiral flow g2. This allows for more efficient fluid mixing.

[0056] (Stationary mixer for fluids A3) Figure 5 shows a second embodiment of the static fluid mixer of the present invention, which is a static fluid mixer A3. The static fluid mixer A3 comprises 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 circumferential surface 19 (inner circumference) is formed, which forms an internal space 4 in the longitudinal direction with a circular hole shape at the center.

[0057] In the pipe body 1b, the interiors 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 passage 901 for supplying fluid and a discharge passage 902 for discharging fluid. The tip of the base inlet pipe 90a is connected to the supply side of the pipe body 1b via a tapered screw (not shown), and the tip of the tip inlet pipe 90b is connected to the discharge side via a tapered screw (not shown). As a result, the supply passage 901 and the discharge passage 902 are in communication with the internal space 4.

[0058] A guide body 3 is housed in the center of the internal space 4. The guide body 3 is a linear, approximately round rod shape with a predetermined diameter. The guide body 3 has conical guide sections 31 and 32 at both ends in the longitudinal direction to assist the flow of the 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 passage 901 and the discharge passage 902.

[0059] Furthermore, the outer surface 39 of the guide body 3 is provided with helical blades 30a and 30b forming protrusions along its entire length at a predetermined pitch. The helical blades 30a and 30b are double screws, and by widening the pitch compared to a single screw, the fluid is made to flow more easily and at higher speed with less resistance. Alternatively, instead of providing the helical blades 30a and 30b, a structure with helical grooves (not shown) can be provided.

[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 the space between the helical vanes 30a and 30b (reference numeral omitted) and a gap 400 of a predetermined width provided between the inner circumferential surface 19 that forms the internal space 4 of the tube body 1b, along the entire length of the tips of the helical vanes 30a and 30b.

[0061] (action) The operation of the stationary fluid mixer A3 will be explained with reference to Figure 5. Figure 5(a) is a cross-sectional diagram of the stationary fluid mixer A3, and Figure 5(b) is a diagram illustrating the fluid flow at the cross-sectional line position in (a) during mixing.

[0062] The fluid, a mixture of acetylene gas and oxygen gas, is supplied through the supply channel 901, which is the fluid supply section of the static fluid mixer A3, to the internal space 4 located in the center of the pipe 1b. A portion of the fluid then flows in a nearly straight line along the inner circumferential surface 19 of the pipe 1b and the gap 400 (flow g5 in Figure 5(b)).

[0063] Furthermore, another portion of the fluid flows through the space 40 along the helical vanes 30a and 30b and the inner circumferential surface 19, and is guided by the helical vanes 30a and 30b to flow in a spiral pattern, becoming a helical flow (flow g4 in Figure 5(b)).

[0064] Then, the fluid flowing in a nearly straight line along the inner circumferential surface 19 of the pipe body 1b and the gap 400, and the fluid flowing in a spiral direction g4, have intersecting flow directions. As a result, they repeatedly collide with each other at the boundary, creating turbulence and mixing, which is then discharged to the outside of the stationary fluid mixer A3 through the discharge passage 902, which is the discharge section.

[0065] Furthermore, since the fluid velocity during mixing is adjusted to be sufficiently high, the acetylene gas and oxygen gas that make up the fluid can be efficiently mixed under high pressure and fully activated.

[0066] (Stationary mixer for fluids A4) Figure 6 shows a stationary fluid mixer A4, which is a first modification of the second embodiment of the stationary fluid mixer of the present invention. In addition to the configuration of the stationary fluid mixer A3 described above, the stationary fluid mixer A4 has grooves 34 of a predetermined width and depth in the longitudinal direction on the outer circumferential surface 39 of the guide body 3a.

[0067] The grooves 34 are provided in four locations on the outer surface 39 in the circumferential direction, parallel to each other and spaced at 90° intervals. In addition, each groove 34 is formed by cutting out the helical vanes 30c and 30d located at the position overlapping with the groove 34 to form a notch 33. The number of grooves 34 is not particularly limited and can be set as appropriate.

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

[0069] (action) The operation of the stationary fluid mixer A4 will be explained with reference to Figure 6. Figure 6(a) is a cross-sectional diagram of the stationary fluid mixer A4, and Figure 6(b) is a diagram illustrating the fluid flow at the cross-sectional line position in (a) during mixing.

[0070] The static fluid mixer A4 has the same configuration as the static fluid mixer A3 described above, and therefore operates in the same way as the static fluid mixer A3. In other words, the fluid supplied from the supply passage 901, which flows straight through the gap 400 in the direction of g5, and the fluid which flows in a spiral in the direction of g4, have their flow directions intersecting. As a result, they repeatedly collide with each other at the boundary, creating turbulence, which is then mixed, and discharged to the outside of the static fluid mixer A4 through the discharge passage 902, which is the discharge section.

[0071] Furthermore, in the stationary fluid mixer A4, new flows are generated in the fluid circulating in space 40: a linear flow passing through each notch 33 of each helical blade 30c, 30d, and a linear flow passing through each notch 33 and overlapping groove 34 (flow g6 in Figure 6(b)). As a result, in addition to the linear flow g5 of the fluid passing through the gap 400, four more linear flows g6 are added, further increasing the number of collision points with the spiral flow g4. This allows for more efficient fluid mixing.

[0072] (Stationary mixer for fluids A5) Figure 7 shows a stationary fluid mixer A5, which is a second modified example of the second embodiment of the stationary fluid mixer of the present invention. The stationary fluid mixer A5 is equipped with a pipe 1b having the same structure as the stationary fluid mixer A3 described above.

[0073] A guide body 3b is housed in the center of the internal space 4a of the pipe body 1b. The guide body 3b is formed in a partially conical shape and is fixed to the base inlet pipe 90a and the tip inlet pipe 90b in a structure that allows fluid to flow, with the wider end facing the supply passage 901.

[0074] Furthermore, spiral blades 30e and 30f are provided at a predetermined pitch along the entire length of the outer surface 39a of the guide body 3b. The spiral blades 30e and 30f are double screws, and by widening the pitch compared to a single screw, the fluid is made to flow more easily and at higher speed with less resistance. Alternatively, instead of providing the spiral blades 30e and 30f, a structure with spiral grooves (not shown) can be provided.

[0075] Furthermore, a space 40a is provided between the guide body 3b and the inner circumferential surface 19 of the pipe body 1b. The space 40a is composed of the space between the helical vanes 30e and 30f (reference numeral omitted) and a gap 400a of a predetermined width provided between the space between the space 41 near the supply passage 901 and the space 42 near the discharge passage 902 of the space 40a, with space 42 being larger.

[0076] (action) Referring to Figure 7, the operation of the static fluid mixer A5 will be explained. The static fluid mixer A5 has a configuration that is substantially the same as that of the static fluid mixer A3, and therefore its operation is the same as that of the static fluid mixer A3.

[0077] In other words, the fluid supplied from the supply channel 901 flows almost straight through the gap 400a along the inner circumferential surface 19 in the direction of g5, and the fluid guided by the helical blades 30e and 30f flows in a spiral in the direction of g4. Because their flow directions intersect, they repeatedly collide with each other at the boundary, creating turbulence which is mixed together, and then discharged to the outside of the stationary fluid mixer A5 through the discharge channel 902, which is the discharge section.

[0078] Furthermore, the space 40a between the tips of the spiral blades 30e and 30f and the inner circumferential surface 19 of the pipe body 1b has different sizes in the space 41 near the supply passage 901 and the space 42 near the discharge passage 902, with space 42 being larger. As a result, when fluid is supplied from the supply passage 901 at a constant pressure, the difference in size between space 41 and space 42 causes the internal pressure to fluctuate easily, for example, the pressure to be higher where the gap is narrower (space 41), which is expected to enable more efficient mixing.

[0079] Referring to Figure 8, variations in the application of the pressure welding torch for the static fluid mixer A3 are explained. For convenience, the static fluid mixer A3 is used as an example here, but the other static fluid mixers A1, A2, and A4 can also be used in a similar manner.

[0080] Figure 8(a) shows a type in which acetylene gas and oxygen gas are supplied to separate static fluid mixers A3, and the two are mixed inside the static fluid mixer A3. Figure 8(b) shows a type 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] Furthermore, the system shown in Figure 8(c) is a type in which only acetylene gas is mixed in a static fluid mixer A3 and then mixed with oxygen gas in the base inlet pipe 90a. In all of the above types, the activated mixture of acetylene gas and oxygen gas is ultimately supplied from the tip inlet pipe 90b.

[0082] Furthermore, the stationary fluid mixers A1 to A4 are not limited to use with the above-mentioned pressure welding torches, but can also be used as gas mixers positioned near the upstream side of the nozzle of other heating devices, such as gas burners used for welding.

[0083] The terms and expressions used in this specification and claims are for illustrative purposes only and are not limiting in any way, and there is no intention to exclude terms or expressions equivalent to the features and parts thereof described herein and in the claims. Furthermore, it goes without saying that various modifications are possible within the scope of the technical concept 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 blades 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 Stationary Mixer for Fluids 3a conductor 34 Groove 30c, 30d spiral feather 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 straight central flow path with a fluid supply section and a fluid discharge section at both ends in the longitudinal direction, On the inner circumferential surface forming the central flow path, a spiral vane is provided, which is spirally arranged so that its inner circumferential edge protrudes from the inner circumferential surface at a predetermined height, from the supply section toward the discharge section. The inner surface is provided with a plurality of grooves at predetermined locations in the circumferential direction, which intersect the helical vanes and are provided linearly in the longitudinal direction of the tube, The groove is provided by cutting out the inner circumferential surface to a predetermined width and depth. The helical blade is provided such that the inner space of the inner peripheral edge is completely open along its entire length, and a notch is formed in each of the grooves. A stationary mixer for fluids.

2. The helical blades are provided to rotate in the same direction along their entire length, from the supply section to the discharge section. A stationary mixer for fluids according to claim 1.

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