JP7355377B2 - fluid supply device - Google Patents

Description

The present invention relates to a fluid supply device for a fluid supply device, and more particularly to a fluid supply device that imparts predetermined flow characteristics to a fluid flowing inside the fluid supply device. For example, the fluid supply device of the present invention can be applied as a fluid supply pipe to cutting fluid supply devices of various machine tools such as grinders, drills, cutting devices, and the like.

Conventionally, when machining a metal workpiece into a desired shape using a machine tool such as a grinder or drill, machining fluid (e.g. coolant ) to cool down the heat generated during machining and to remove chips (also called chips) from the workpiece from the machining location. Cutting heat generated by high pressure and frictional resistance at the contact area between the workpiece and the cutter wears out the cutting edge or reduces its strength, shortening the life of tools such as the cutter. Furthermore, if chips from the workpiece are not sufficiently removed, they may stick to the cutting edge during machining, reducing machining accuracy.

Machining fluid, also called cutting fluid, reduces the frictional resistance between the tool and the workpiece, removes cutting heat, and at the same time performs a cleaning action to remove chips from the surface of the workpiece. For this reason, it is preferable that the machining fluid has a low coefficient of friction, a high boiling point, and has the characteristics of well penetrating into the contact area between the cutter and the workpiece.

For example, Japanese Patent Application Laid-Open No. 11-254281 discloses that a processing device is equipped with a gas ejection means that ejects gas (for example, air) in order to forcibly infiltrate the processing fluid into the contact area between the working element (cutting tool) and the workpiece. A technique for providing the same is disclosed.

Furthermore, Japanese Patent Laid-Open No. 2004-33962 discloses a fluid discharge pipe having a structure in which a helical blade root body and a flip-flop phenomenon generating shaft body are aligned and then inserted and fixed into a cylinder body.

Japanese Patent Application Publication No. 11-254281 JP2004-33962

According to a conventional technique such as the one disclosed in Patent Document 1, in addition to a means for discharging machining fluid to a machine tool, a means for ejecting gas at high speed and high pressure must be additionally provided, which increases costs. At the same time, there is a problem that the device becomes larger. Further, in a grinding machine, there is a problem in that the machining fluid cannot sufficiently reach the contact portion between the grinding wheel and the workpiece due to air rotating along the outer peripheral surface of the grinding wheel that rotates at high speed. Therefore, simply by jetting air in the same direction as the rotational direction of the grinding wheel, it is difficult to allow the machining fluid to penetrate sufficiently, so there is still the problem that it is difficult to cool the machining heat to a desired level.

In the fluid discharge pipe structure of Patent Document 2, the helical blade root body and the flip-flop phenomenon generating shaft body are separate bodies, so when both members are made of metal, the tip thereof becomes a sharp blade. , Care must be taken in the alignment work process, which reduces work efficiency. There is also the problem that processing accuracy must be high in order to match the dimensions of the two separated members.

The present invention was developed in view of such circumstances. An object of the present invention is to provide a fluid supply device that can impart predetermined flow characteristics to the fluid flowing inside the device to improve the lubricity, permeability, and cooling effect of the fluid, and is easy to manufacture. be.

In order to solve the above problems, the present invention has the following configuration. That is, the fluid supply device includes a storage body and an internal structure housed in the storage body. The internal structure includes a shaft portion and a plurality of protrusions protruding from the outer circumferential surface of the shaft portion, and each of the plurality of protrusions is formed with at least one step.

Moreover, in one embodiment of the present invention, the fluid supply device includes a storage body and an internal structure housed in the storage body. The storage body includes an inlet and an outlet, and the internal structure includes a first portion and a second portion integrally formed on a common shaft having a circular cross section. The first part is located on the upstream side of the storage body when the internal structure is stored in the storage body, and includes a shaft portion and a wing formed in a spiral shape to generate a swirl flow in the fluid. The second portion is located downstream of the first portion and includes a shaft portion and a plurality of protrusions protruding from the outer circumferential surface of the shaft portion, and the second portion includes a shaft portion and a plurality of protrusions protruding from the outer circumferential surface of the shaft portion. The part is formed by intersecting a spiral flow path that is connected in a spiral shape by dividing the circumference of the shaft into a plurality of parts, and a closed flow path that is divided into a plurality of parts in the longitudinal direction of the shaft. At least one step is formed parallel to the circumferential direction of the shaft portion.
Further, an internal structure according to an embodiment of the present invention is an internal structure housed in a storage body of a fluid supply device, and the internal structure includes a shaft portion and a plurality of At least one step is formed in each of the plurality of projections.
Furthermore, an internal structure according to another embodiment of the present invention is an internal structure housed in a housing of a fluid supply device, and the internal structure is integrated on a common shaft portion having a circular cross section. It includes a first portion and a second portion formed by. The first part is located on the upstream side of the storage body when the internal structure is stored in the storage body, and includes a shaft portion and a wing formed in a spiral shape to generate a swirl flow in the fluid. The second portion is located downstream of the first portion and includes a shaft portion and a plurality of protrusions protruding from the outer circumferential surface of the shaft portion, and the second portion includes a shaft portion and a plurality of protrusions protruding from the outer circumferential surface of the shaft portion. The part is formed by intersecting a spiral flow path that is connected in a spiral shape by dividing the circumference of the shaft into a plurality of parts, and a closed flow path that is divided into a plurality of parts in the longitudinal direction of the shaft. At least one step is formed parallel to the circumferential direction of the shaft portion.
Further, a fluid supply device according to another embodiment of the present invention is a fluid supply device, and includes an internal structure and a storage body for housing the internal structure. The storage body includes an inlet and an outlet, and the internal structure includes a first portion, a second portion, and a third portion integrally formed on a common shaft portion having a circular cross section. part and a fourth part. The first part is located on the upstream side of the storage body when the internal structure is stored in the storage body, and includes a shaft portion and a wing formed in a spiral shape to generate a swirl flow in the fluid. The second portion is located downstream of the first portion and includes a shaft portion and a plurality of projections protruding from the outer peripheral surface of the shaft portion, and the third portion is located downstream of the first portion. The fourth part is located downstream from the third part and includes a shaft part and a spirally formed blade to generate a swirl in the fluid.The fourth part is located downstream from the third part. The fourth portion includes a shaft portion and a plurality of protrusions protruding from the outer circumferential surface of the shaft portion, and each of the plurality of protrusions of the fourth portion includes at least one protrusion portion parallel to the circumferential direction of the shaft portion. A step is formed.
Furthermore, in the fluid supply device of one embodiment of the present invention, the first internal structure, the second internal structure, and the storage for storing the first internal structure and the second internal structure are provided. including the body. The storage body includes an inlet and an outlet. The first internal structure includes a head and a body that are integrally formed on a common shaft portion having a circular cross section, and the head is attached to the first internal structure in the storage body. When the body is stored, it is located on the upstream side of the storage body, and includes a shaft part and wings formed in a spiral shape to generate a swirl flow in the fluid, and the body part is located on the downstream side of the head part. The shaft includes a shaft and a plurality of projections protruding from the outer peripheral surface of the shaft. The second internal structure in the form of a hollow shaft includes a head integrally formed on the hollow shaft and a body, and the head is attached to the second internal structure in the storage body. When the body is stored, it is located on the upstream side of the storage body, and includes a shaft part and wings formed in a spiral shape to generate a swirl flow in the fluid, and the body part is located on the downstream side of the head part. The shaft includes a shaft and a plurality of projections protruding from the outer peripheral surface of the shaft. At least a portion of the first internal structure is housed in the hollow part of the second internal structure, and each of the plurality of projections of the body of the second internal structure extends in the circumferential direction of the shaft. At least one step is formed parallel to the surface.
Furthermore, the internal structure of the fluid supply device according to an embodiment of the present invention includes a first portion, a second portion, and a second portion that are integrally formed on a common shaft portion having a circular cross section. 3 and a fourth part, the first part is located on the upstream side of the housing when the internal structure is housed in the housing, and the first part is located on the upstream side of the housing and creates a swirl flow in the fluid. The second part is located downstream of the first part and includes a shaft part and a plurality of protrusions protruding from the outer circumferential surface of the shaft part. The third part is located downstream of the second part and includes a shaft part and a wing formed in a spiral shape so as to generate a swirling flow in the fluid, The fourth portion is located on the downstream side of the third portion and includes a shaft portion and a plurality of protrusions protruding from the outer peripheral surface of the shaft portion, and each of the plurality of protrusions of the fourth portion At least one step is formed in parallel to the circumferential direction of the shaft portion.
In addition, in the combination of the first and second internal structures of the fluid supply device according to still another embodiment of the present invention, the first internal structure is integrally formed on a common shaft portion having a circular cross section. and a body portion, the head portion being located on the upstream side of the storage body when the first internal structure is stored in the storage body, and a shaft portion, The body part includes wings formed in a spiral shape to generate a swirl flow in the fluid, and the body part is located downstream of the head part, and includes a shaft part and a plurality of protrusions protruding from the outer peripheral surface of the shaft part. The second internal structure has a hollow shaft shape and includes a head portion integrally formed on the hollow shaft portion, and a body portion, and the head portion includes a body portion. When the second internal structure is stored in the storage body, the second internal structure is located on the upstream side of the storage body, and includes a shaft portion and a wing formed in a spiral shape to generate a swirl flow in the fluid. The body portion is located downstream of the head portion and includes a shaft portion and a plurality of projections protruding from the outer circumferential surface of the shaft portion. At least a portion of the first internal structure is housed in the hollow part of the second internal structure, and each of the plurality of projections of the body of the second internal structure extends in the circumferential direction of the shaft. At least one step is formed parallel to the surface.

If the fluid supply device of the present invention is installed in a fluid supply section of a machine tool, etc., a large number of fine bubbles (microbubbles on the order of micrometers and ultra-fine bubbles with a smaller particle size) generated inside the fluid supply device can be installed. The cleaning effect is improved compared to the conventional method due to the vibration and shock generated during the process in which so-called nanobubbles (on the order of nanometers) collide with the tool and workpiece and disappear. This extends the life of tools such as grinding blades and reduces the cost of tool replacement. In addition, the fluid characteristics provided by the fluid supply device of the present invention include the generation of fine bubbles, which lowers the surface tension of the fluid and increases its penetrating power and lubricity. As a result, the effect of cooling the heat generated at the point where the tool and the workpiece come into contact is greatly increased. It is possible to improve fluid permeability, increase the cooling effect, improve lubricity, and improve processing accuracy.

Further, in many embodiments of the present invention, at least one step is formed on each of the plurality of protrusions provided on the shaft of the internal structure of the fluid supply device, thereby complicating the flow of the fluid. Become. In other words, a turbulent flow such as a vortex is generated, which is suitable for dispersing, stirring, or mixing the fluid.Also, a channel with a narrow cross-sectional area is formed, which increases the velocity of the fluid and lowers the static pressure, which will be discussed later. This promotes the induction of cavitation phenomenon in the fluid. Furthermore, increasing the overall flow rate of the flowing fluid is expected to reduce pressure loss in the fluid supply device, which is particularly useful when the fluid has a high viscosity.

The fluid supply device of the present invention can be applied to coolant supply units in various machine tools such as grinders, cutting machines, drills, and the like. In addition, it can be effectively used in devices that mix two or more types of fluids (liquids and liquids, liquids and gases, or gases and gases). The present invention is also applicable to a variety of other fluid supply applications. For example, it can be applied to various uses such as shower nozzles, hydroponic cultivation equipment, and pollutant removal equipment. In the case of a shower nozzle, water or hot water flows into a fluid supply device to impart predetermined flow characteristics to improve the cleaning effect. In particular, fine bubbles reduce the surface tension of the fluid and increase its permeability. In the case of a hydroponic cultivation device, water can flow into the fluid supply device to increase dissolved oxygen and discharge it. In addition, for contaminant removal equipment, specific gases such as air and various other gases (hydrogen, ozone, oxygen, etc.) are dissolved in liquids (e.g. water), and liquids containing gases in fine bubbles ( It can also be applied when supplied as water).

A deeper understanding of the present application can be gained when the following detailed description is considered in conjunction with the following drawings. These drawings are illustrative only and are not intended to limit the scope of the invention.
1 shows an example of a grinding device equipped with a fluid supply section to which the present invention is applied. FIG. 2 is an exploded side view of the fluid supply pipe according to the first embodiment of the present invention. FIG. 2 is a side perspective view of the fluid supply pipe according to the first embodiment of the present invention. FIG. 3 is a three-dimensional perspective view of the internal structure of the fluid supply pipe according to the first embodiment of the present invention. FIG. 2 is an enlarged view of a protrusion formed in the internal structure of the first embodiment of the present invention, in which one step is formed. FIG. 3 is a diagram illustrating an example of a method for forming a flow characteristic providing portion of the internal structure of the tube according to the first embodiment of the present invention. FIG. 7 is a three-dimensional perspective view of a modification of the internal structure of the fluid supply pipe according to the first embodiment of the present invention. It is an enlarged view of the projection part formed in the modification of the internal structure of the 1st Embodiment of this invention, and two steps are formed. It is a figure explaining an example of the method of forming the flow characteristic provision part in the modification of the internal structure of the 1st embodiment pipe|tube of this invention. FIG. 3 is an exploded side view of a fluid supply pipe according to a second embodiment of the present invention. FIG. 7 is a side perspective view of a fluid supply pipe according to a second embodiment of the present invention. FIG. 7 is an exploded side view of a fluid supply pipe according to a third embodiment of the present invention. FIG. 7 is a side perspective view of a fluid supply pipe according to a third embodiment of the present invention. FIG. 7 is an exploded side view of a fluid supply pipe according to a fourth embodiment of the present invention. FIG. 7 is a side perspective view of a fluid supply pipe according to a fourth embodiment of the present invention. FIG. 7 is an exploded side view of a fluid supply pipe according to a fifth embodiment of the present invention. FIG. 7 is a side perspective view of a fluid supply pipe according to a fifth embodiment of the present invention.

In this specification, an embodiment in which the present invention is applied to a machine tool such as a grinding device will be mainly described, but the field of application of the present invention is not limited to this. The present invention is applicable to various applications for supplying fluids, and can be implemented in a wide range of industrial fields including, for example, shower nozzles, fluid mixing devices, hydroponic cultivation devices, contaminant removal devices, and the like.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of a grinding device equipped with a fluid supply section to which the present invention is applied. As illustrated, the grinding device 1 includes a grinding blade (grindstone) 2, a table 3 for moving the workpiece W on a flat surface, and a column (not shown) for moving the workpiece W or the grinding blade 2 up and down. , etc., and a fluid supply section 5 that supplies fluid (i.e., coolant) to the grinding blade 2 and the workpiece W. The fluid is, for example, water. The grinding blade 2 is rotated clockwise in the plane of FIG. 1 by a drive source (not shown), and the workpiece W is rotated by friction between the outer peripheral surface of the grinding blade 2 and the workpiece W at the grinding location G. surface is ground. Although not shown, the fluid supply section 5 includes a tank that stores fluid and a pump that drains the fluid from the tank.

The fluid supply unit 5 includes a nozzle 6 having a discharge port for discharging fluid toward the grinding blade 2 and the workpiece W, a fluid supply pipe P having an internal structure that imparts predetermined flow characteristics to the fluid, and a tank. It includes a pipe 9 into which the stored fluid flows in by a pump. The joint portion 7 connects the outlet side of the fluid supply pipe P and the nozzle 6. The joint portion 8 connects the inlet side of the fluid supply pipe P and the pipe 9. The fluid flowing into the fluid supply pipe P from the pipe 9 has a predetermined flow characteristic due to its internal structure while passing through the fluid supply pipe P, passes through the outlet of the fluid supply pipe P, and passes through the nozzle 6 to the grinding point. Spit out towards G. According to multiple embodiments of the present invention, the fluid that has passed through the fluid supply pipe P includes fine bubbles. Hereinafter, various embodiments of the fluid supply pipe P will be described with reference to the drawings. Note that the fluid supply pipe P is not limited to the pipe shape shown in the embodiments below, and a storage body having an arbitrary external shape can be used. However, it is preferable that the inner surface of the storage body, that is, the surface that comes into contact with the fluid between the storage body and the internal structure, has a tubular structure.

(First embodiment)
FIG. 2 is an exploded side view of the fluid supply pipe 100 according to the first embodiment of the present invention, and FIG. 3 is a side perspective view of the fluid supply pipe 100. FIG. 4 is a three-dimensional perspective view of the internal structure 140 of the fluid supply tube 100. As shown in FIGS. 2 and 3, the fluid supply tube 100 includes a tube body 110 and an internal structure 140. In FIGS. 2 and 3, fluid flows from the inlet 111 to the outlet 112 side.

The tube main body 110 functions as a storage body for storing the internal structure 140 in its internal space. The tube body 110 is composed of an inflow side member 120 and an outflow side member 130. The inflow side member 120 and the outflow side member 130 have the form of hollow cylindrical tubes. The inflow side member 120 has an inflow port 111 with a predetermined diameter at one end, and a female thread formed by threading the inner peripheral surface at the other end for connection with the outflow side member 130. 126. A connecting portion 122 is formed on the side of the inlet 111, and the connecting portion 122 is connected to the joint portion 8 (see FIG. 1). For example, the inflow side member 120 and the joint portion 8 are connected by a screw connection between a female thread formed on the inner peripheral surface of the connecting portion 122 and a male thread formed on the outer peripheral surface of the end portion of the joint portion 8 . In this embodiment, as shown in FIG. 2, the inlet side member 120 has a different inner diameter at both ends, that is, an inner diameter of the inlet 111 and an inner diameter of the female thread 126. smaller than the inner diameter of A tapered portion 124 is formed between the inlet 111 and the female thread 126. The present invention is not limited to this configuration, and the inflow side member 120 may have the same inner diameter at both ends.

The outflow side member 130 has an outflow port 112 with a predetermined diameter at one end, and a male thread 132 formed by threading the outer peripheral surface at the other end for connection with the inflow side member 120. Equipped with The diameter of the outer peripheral surface of the male thread 132 of the outflow side member 130 is the same as the inner diameter of the female thread 126 of the inflow side member 120. A connecting portion 138 is formed on the side of the outlet 112, and the connecting portion 138 is connected to the joint portion 7 (see FIG. 1). For example, the outflow side member 130 and the joint portion 7 are connected by a screw connection between a female thread formed on the inner peripheral surface of the connecting portion 138 and a male thread formed on the outer peripheral surface of the end portion of the joint portion 7 . A cylindrical portion 134 and a tapered portion 136 are formed between the male thread 132 and the connecting portion 138. In this embodiment, the inner diameter of both ends of the outlet member 130, that is, the inner diameter of the outlet 112 and the inner diameter of the male thread 132 are different, and the inner diameter of the outlet 112 is smaller than the inner diameter of the male thread 132. The present invention is not limited to this configuration, and both ends of the outflow side member 130 may have the same inner diameter. The inflow side member 120 and the outflow side member 130 are connected by a screw connection between the female thread 126 on the inner peripheral surface of the one end of the inflow side member 120 and the male thread 132 on the outer peripheral surface of the one end of the outflow side member 130. A tube body 110 is formed.

The above configuration of the tube body 110 is only one embodiment, and the present invention is not limited to the above configuration. For example, the connection between the inflow side member 120 and the outflow side member 130 is not limited to the above-mentioned screw connection, and any method of connecting mechanical parts known to those skilled in the art can be applied. Further, the forms of the inflow side member 120 and the outflow side member 130 are not limited to the forms shown in FIGS. 2 and 3, and may be arbitrarily selected by the designer or changed depending on the use of the fluid supply pipe 100. can. The inflow side member 120 or the outflow side member 130 is made of, for example, metal such as steel, or non-metal such as plastic or resin. 2 and 3 together, after the internal structure 140 is housed in the outflow side member 130, the fluid supply pipe 100 connects the external thread 132 on the outer peripheral surface of the outflow side member 130 and the inner circumference of the inflow side member 120. It is understood that it is constructed by coupling the internal thread 126 of the surface.

The internal structure 140 is formed, for example, by a method of processing a cylindrical member made of metal such as steel, a method of molding plastic (including a method of injection molding, etc.), or the like. As shown in FIGS. 2 and 4, the internal structure 140 of this embodiment is integrally formed on a common shaft portion 141 having a circular cross section from the upstream side to the downstream side. It includes a fluid diffusion section 142 , a vortex generation section 143 , a flow characteristic providing section 145 , and a guiding section 150 . Each of the fluid diffusion section 142, the vortex generation section 143, the flow characteristic providing section 145, and the guiding section 150 may perform processing such as cutting, turning, or grinding on a part of one cylindrical member alone or in combination thereof, for example. formed by. Alternatively, it can also be three-dimensionally printed from metal or resin material using a 3D printer.

The fluid diffusion portion 142 has a conical shape, and is formed by, for example, machining one end of a cylindrical member into a conical shape. The fluid diffusion portion 142 diffuses the fluid flowing into the inflow side member 120 through the inlet 111 from the center of the tube to the outside, that is, in the radial direction. The fluid diffusion portion 142 is located at a position corresponding to the tapered portion 124 of the inflow side member 120 when the internal structure 140 is housed in the tube body 110 (see FIG. 3). In this embodiment, the fluid diffusion section 142 has a conical shape, but the present invention is not limited to this embodiment. In other embodiments, fluid diffuser 142 has the form of a dome. The fluid diffusion portion 142 may take other forms as long as it gradually expands concentrically from one point at the tip. In yet other embodiments, internal structure 140 does not include fluid diffuser 142. These modifications are similarly applicable to other embodiments described below.

The vortex generator 143 is a part or all of the head of the internal structure 140 located on the upstream side of the tube body 110 when the internal structure 140 is housed in the tube body 110, and is shown in FIGS. In embodiment No. 4, it is located downstream of the fluid diffuser 142. As shown in the figure, the swirl generator 143 includes a shaft portion 141 having a circular cross section and a constant diameter along the length, and three spiral blades 143-1, 143-. 2, 143-3. As shown in FIG. 2, the length 11 in the axial direction of the fluid diffusion section 142 (the direction in which the fluid flows as a whole) is longer than the length 12 in the longitudinal direction of the axial section 141 of the vortex generation section 143. The length l2 of the shaft portion 141 of the swirl generating portion 143 in the longitudinal direction is shorter than the length l3 of the shaft portion 141 of the flow characteristic providing portion 145 in the longitudinal direction. That is, the relationship l1<l2<l3 holds between the respective lengths l1, l2, and l3. Note that l1 and l2 can be approximately the same length, or l1 can be longer than l2, but in either case l3 is longer than l1 and l2. The diameter of the portion of the fluid diffusion section 142 having the maximum cross-sectional area is the same as the diameter of the shaft section 141 of the swirl generating section 143 . In other embodiments, the diameter of the portion of the fluid diffusion portion 142 having the largest cross-sectional area may be smaller or larger than the diameter of the shaft portion 141 of the swirl generator 143. In either case, the radius of the portion of the fluid diffusion section 142 where the cross-sectional area is maximum is smaller than the radius of the swirl generation section 143 (the distance from the center of the shaft section 141 of the swirl generation section 143 to the tip of each blade). is preferred. These modifications are similarly applicable to other embodiments described below.

As shown in FIG. 4, the tips of the blades 143-1, 143-2, and 143-3 of the swirl generator 143 are offset from each other by 120° in the circumferential direction of the shaft portion 141, and 141 is formed in a counterclockwise spiral shape at a predetermined interval on the outer circumferential surface of the portion corresponding to the spiral generating portion 143. Although the number of blades is three in this embodiment, the present invention is not limited to this embodiment. For example, one, two, four or more wings may be provided. Further, the form of the blades 143-1, 143-2, and 143-3 of the swirl generator 143 is not particularly limited as long as the form can generate a swirl flow while the fluid passes between the blades. In this embodiment, the vortex generator 143 has an outer diameter that is close to the inner peripheral surface of the cylindrical portion 134 of the outflow side member 130 of the tube body 110 when the internal structure 140 is housed in the tube body 110. . Note that, according to some embodiments, the swirl generator 143 may not be provided. In that case, the shaft member 141 may include only the flow characteristic providing section 145, only the flow characteristic providing section 145 and the guiding section 150, or a portion having other functions on the upstream side or the downstream side. . Such various modifications can be similarly applied to other embodiments described below.

The flow characteristic providing section 145 is formed on the downstream side of the swirl generating section 143 across a predetermined section 144 and corresponds to part or all of the body section of the internal structure 140 . As shown in FIGS. 2 and 4, the flow characteristic providing portion 145 includes a shaft portion 141 having a circular cross section and a constant diameter, and a plurality of mesh-shaped shaft portions protruding from the outer peripheral surface of the shaft portion 141. A protrusion (protrusion) 145p is included. In this embodiment, the diameter of the shaft portion 141 of the flow characteristic providing portion 145 is larger than the diameters of the shaft portions 141 of the swirl generating portion 143 and the predetermined section 144 . Therefore, the flow rate flowing into the swirl generating section 143 is sufficiently secured, and the swirling force of the fluid by the swirl generating section 143 becomes sufficiently large. Then, while the fluid flows from the vortex generating section 143 to the flow characteristic providing section 145 via a predetermined section 144, the cross-sectional area of the flow path decreases rapidly, changing the flow characteristics of the fluid. Furthermore, a step exists between the swirl generating section 143 and the flow characteristic providing section 145 due to the difference in diameter. Therefore, in order to improve fluid flow, the section 144 may be formed into a tapered shape in which the diameter of the shaft body 141 gradually increases, or between the plurality of protrusions 145p of the flow characteristic providing section 145, as necessary. A groove for guiding fluid is formed at least at the inlet of the spiral flow path, which will be described later. Such a configuration can be similarly applied to other embodiments to be described later.

FIG. 5 shows an enlarged view of the shape of one protrusion 145p formed in the flow characteristic providing section 145. When each of the protrusions 145p is formed by processing a cylindrical member by cutting or the like, the top surface (upper surface) is the outer peripheral surface of the original cylindrical member and is approximately rhombic (vertex angle is approximately 30 degrees). be. The bottom surface (lower surface) is the outer peripheral surface of the shaft portion 141, and is approximately parallelogram-shaped. In this embodiment, a step 145p-d1 is provided at approximately 1/3 of the total height from the bottom surface of the protrusion 145p in the height direction (radial direction of the shaft portion 141). The steps are configured. Of course, the height of this step 145p-d1 can be changed as appropriate, such as to 1/2 or 2/3 of the total height. This step 145p-d1 is formed parallel to the circumferential direction of the shaft portion 141. Alternatively, the step 145p-d1 is parallel to the circumferential direction and perpendicular to the radial direction. This step 145p-d1 is formed by performing cutting, turning, and grinding, such as a cutting process using an end mill, or by performing a combination of these processes.

FIG. 6 shows an example of a method for forming the protrusion 145p and the flow path 145r according to this embodiment. As shown in Fig. 6, there are a plurality of lines (for example, 14 annular closed lines flowing in parallel) at regular intervals in the direction of 90 degrees with respect to the length direction of the cylindrical member (left-right direction in the drawing). A line (multiple lines, e.g., 12 spiral channels) at a certain interval inclined at a predetermined angle (e.g., 60 degrees) with respect to the length direction intersects Processing such as cutting is performed by skipping once between the lines in the direction of , and processing such as cutting is performed by skipping once between the inclined lines. In this way, a plurality of protrusions 145p protruding from the outer circumferential surface of the shaft portion 141 are regularly formed one by one vertically (in the circumferential direction) and left and right (in the length direction of the shaft portion 141). At this time, as described above, by forming the step 145p-d1 on the protrusion 145p, in the radial direction of the shaft portion 141, from the side closest to the center, the lower surface (or bottom surface), the second step, and the upper step (top) are formed. It has a three-layer structure (surface or top surface). A flow path 145r is formed between each protrusion 145p. In this embodiment, the flow characteristic providing section 145 has an outer diameter that is close to the inner peripheral surface of the cylindrical portion 134 of the outflow side member 130 of the tube body 110 when the internal structure 140 is housed in the tube body 110. have Note that the shape of the plurality of protrusions 145p can take various shapes, such as triangles, polygons, and other shapes (in this case, each protrusion has at least one step on the bottom surface). (provided at a certain height from the top), the arrangement can be changed as appropriate (angle, width, etc.) from FIG. This modification is similarly applicable to other embodiments described below.

In this embodiment, as shown in FIG. 2, the diameter of the shaft portion 141 of the flow characteristic providing portion 145 and the section 144 is larger than the diameter 141 of the shaft portion of the swirl generating portion 143, but may be the same. . In this embodiment, a dome-shaped guiding section 150 is provided downstream of the flow characteristic providing section 145. The fluid guided toward the center by the guiding part 150 passes through the tapered part 136 and is discharged through the outlet 112.

The flow of the fluid while it passes through the fluid supply pipe 100 will be described below. The fluid that flows in through the inlet 111 via the pipe 9 (see FIG. 1) by an electric pump whose impeller turns right or left passes through the center of the pipe while passing between the tapered part 124 and the fluid diffusion part 142. diffused from the outside to the outside. The fluid then passes between the three spirally formed blades 143-1 to 143-3 of the swirl generator 143. As a result, the fluid becomes a strong swirling flow by each blade of the swirl generating section 143 and is sent to the flow characteristic providing section 145.

The fluid flows through a plurality of narrow flow paths 145r (specifically, for example, 12 spiral flow paths and 14 annular closed flow paths It passes through a cross-flow path consisting of a When the fluid passes through the plurality of narrow channels formed by the plurality of protrusions 145p, turbulent flow is generated and a large number of minute vortices are generated. This phenomenon induces mixing and diffusion of fluids. The above structure of the flow characteristic providing section 145 is also useful when mixing two or more fluids having different properties.

Further, in the internal structure 140, the fluid flows from the upstream side having a large cross-sectional area (vortex generating part 143) to the downstream side having a small cross-sectional area (flow path formed between the plurality of protrusions 145p of the flow characteristic providing part 145). 145r). This structure changes the static pressure of the fluid as explained below. The relationship between pressure, velocity, and potential energy in a state where no external energy is applied to the fluid is expressed as the Bernoulli equation below.

Here, p is the pressure at a point within the streamline, ρ is the density of the fluid, υ is the velocity of the flow at that point, g is the gravitational acceleration, h is the height of that point relative to the reference plane, and k is a constant. be. The Bernoulli theorem, expressed as the above equation, is an application of the law of conservation of energy to fluids, and explains that for a flowing fluid, the sum of all forms of energy on a streamline is always constant. According to Bernoulli's theorem, upstream where the cross-sectional area is large, the velocity of the fluid is low and the static pressure is high. On the other hand, downstream, where the cross-sectional area is small, the velocity of the fluid is high and the static pressure is low.

When the fluid is a liquid, vaporization of the liquid begins when the reduced static pressure reaches the saturated vapor pressure of the liquid. This phenomenon in which the static pressure becomes lower than the saturated vapor pressure (3000-4000 Pa in the case of water) within a very short period of time at approximately the same temperature and the liquid rapidly vaporizes is called cavitation. The internal structure of the fluid supply pipe 100 of the present invention induces such a cavitation phenomenon. Due to the cavitation phenomenon, the liquid boils using minute bubble nuclei of 100 microns or less existing in the liquid as nuclei, and many small bubbles are generated due to the liberation of dissolved gas. That is, a large number of fine bubbles are generated while the fluid passes through the flow characteristic providing unit 145. In particular, in this embodiment, since the diameter of the shaft section 141 of the flow characteristic providing section 145 is larger than the diameter of the shaft section 141 of the swirl generating section 143, the fluid flows while flowing from the swirl generating section 143 to the flow characteristic providing section 145. The channel narrows rapidly, and as a result, the above-mentioned cavitation phenomenon is further amplified. Furthermore, since the plurality of protrusions 145p of the flow characteristic providing section 145 are provided with steps 145p-d1, the flow path becomes more complicated, turbulent flow (for example, vortices) occurs, and the cross-sectional area decreases. The narrow channels are formed in a complicated manner, and in the narrow channels, the speed of the fluid increases and the static pressure decreases, which promotes the induction of the cavitation phenomenon of the fluid, which will be described later, and effectively generates fine bubbles.

In the case of water, one water molecule can form hydrogen bonds with four other water molecules, and it is not easy to break this hydrogen bond network. For this reason, water has a much higher boiling point and melting point than other liquids that do not form hydrogen bonds, and exhibits a high viscosity. The high boiling point of water has an excellent cooling effect, so it is often used as cooling water for processing equipment that performs grinding, etc. However, the water molecules are large, so it has good permeability and lubricity to the processing area. The problem is that there is no. Therefore, special lubricating oil (i.e., cutting oil), which is not normally water, is often used alone or in combination with water. By the way, when the fluid supply pipe of the present invention is used, water vaporization occurs due to the cavitation phenomenon described above, and as a result, the hydrogen bond network of water is destroyed and the viscosity becomes low. Furthermore, fine bubbles generated by vaporization improve permeability and lubricity. Increased permeability results in increased cooling efficiency. Therefore, according to the present invention, the machining quality, ie, the performance of the machine tool, can be improved using only water without using special lubricating oil.

The fluid that has passed through the flow characteristic providing section 145 flows toward the end of the internal structure 140 via the guiding section 150 . When flowing from the plurality of narrow channels of the flow characteristic providing section 145 to the tapered section 136 of the outflow side member 130, the channels suddenly become wider. The fluid exits through the outlet 112 and is discharged through the nozzle 6 towards the grinding location G. When the fluid is discharged through the nozzle 6, a large number of fine bubbles generated in the flow characteristic providing part 145 are exposed to atmospheric pressure, collide with the grinding blade 2 and the workpiece W, and the bubbles break or explode and disappear. . The vibrations and shocks generated during the bubble disappearance process effectively remove sludge and chips generated at the grinding location G. In other words, the cleaning effect around the grinding location G is improved while the fine bubbles disappear.

The fluid supply pipe 100 of the present invention can be applied to machining fluid supply sections in various machine tools such as grinding devices, cutting devices, drills, and the like. By installing it in the fluid supply section of machine tools, etc., it is possible to cool down the heat generated between the grinding blade and the workpiece more effectively than before, and the permeability and lubricity are improved, improving machining accuracy. can be improved. In addition, by effectively removing chips from the workpiece from the machining location, the life of tools such as cutting blades can be extended, and the cost of tool replacement can be reduced. Furthermore, by providing the step 145p-d1 in the protrusion 145p, a part of the side surface of the protrusion 145p is cut out, and the cross-sectional area of the flow path between the protrusions 145p becomes larger as a result, providing flow characteristics. It is expected that the cross-sectional area of the flow path of the section 145 will be increased and the flow rate of the fluid flowing through the flow path will be increased, thereby reducing the pressure loss of the fluid supply device. Useful.

In this embodiment, since the fluid diffusion part 142, the vortex generation part 143, the flow characteristic providing part 145, and the guiding part 150 of the internal structure 140 are integrally formed by processing one cylindrical member, the internal structure 140 is Manufactured as one integrated part. Therefore, after the internal structure 140 is housed inside the outflow side member 130, the outflow side member 130 and the inflow side member 120 are connected (for example, the male thread 132 of the outflow side member 130 and the female thread 126 of the inflow side member 120 are connected). The fluid supply pipe 100 can be manufactured by a simple process (by screw connection). Further, since it is not necessary to pay much attention to alignment and dimension matching between the swirl generating section 143 and the flow characteristic providing section 145, the time and cost required for processing and assembly can be reduced.

The fluid supply pipe of one embodiment of the present invention can also be effectively used in a device that mixes two or more fluids (liquid and liquid, liquid and gas, gas and gas, etc.). In particular, the protrusion 145p of the flow characteristic providing section 145 is provided with one step 145p-d1, which causes turbulence in the fluid and improves the mixing efficiency of the fluid. For example, if this fluid supply pipe is applied to a combustion engine, combustion efficiency will be improved by sufficiently mixing fuel and air. Moreover, if this fluid supply pipe is applied to a cleaning device, the cleaning effect can be further improved compared to a normal cleaning device. Furthermore, this fluid supply pipe can be used in a hydroponic cultivation apparatus to increase dissolved oxygen in the supplied water, thereby maintaining or increasing the amount of oxygen in the water (dissolved oxygen concentration).

(Modified example of the first embodiment)
Next, a modification of the first embodiment will be described with reference to FIGS. 7 to 9. This modification differs from the first embodiment in that two steps are provided in the protrusion. Since the other points are the same as those in the first embodiment, the same parts are given the same reference numerals and the explanation will be omitted. FIG. 7 is a three-dimensional perspective view of the internal structure 1140, and FIG. 8 is an enlarged view of the protrusion 1145p on the shaft body 141 provided in a net shape of the flow characteristic providing portion 1145. In this modification, a step 1145p-d1 is provided at approximately 1/3 of the total height from the bottom surface of the protrusion 1145p in the height direction (radial direction of the shaft portion 141), and a step 1145p is located at approximately 2/3. -d2 are respectively provided to form an upper stage, a second stage, and a third stage. The steps 1145p-d1 and 1145p-p2 are formed parallel to the circumferential direction of the shaft portion 141. Alternatively, the steps 1145p-d1 and 1145p-d2 are parallel to the circumferential direction and perpendicular to the radial direction. Of course, the heights of the steps 1145p-d1 and 1145p-d2 can be changed as appropriate. Furthermore, the number of steps may be three or more. The steps 1145p-d1 and 1145-d2 are formed by cutting, turning, and grinding, such as a cutting process using an end mill, either singly or in combination.

FIG. 9 shows an example of a method for forming the protrusion 1145p and the flow path 1145r according to this modification. Similar to the first embodiment shown in FIG. 6, a protrusion 1145p and a flow path 1145r are formed. At this time, by forming steps 1145p-d1 and 1145p-d2 on the protrusion 1145p, in the radial direction of the shaft portion 141, from the side closest to the center, the lower surface (or bottom surface), the third step, the second step, and the upper step. It has a four-layer configuration (top or top surface). A flow path 1145r is formed between each protrusion 1145p. Similarly to the first embodiment, this flow path 1145r also has a plurality of lines (for example, 14 lines flowing in parallel) having a constant interval in a direction of 90 degrees with respect to the length direction of the columnar member (left-right direction in the drawing). An annular closed flow path) and lines (a plurality of lines, for example 12 spiral flow paths) inclined at a predetermined angle (e.g. 60 degrees) at regular intervals with respect to the length direction. It will be crossed. Note that the shape of the plurality of protrusions 1145p can take various shapes in addition to those with a cross section of approximately rhombus or parallelogram (or approximately quadrilateral), and may be modified to a triangular, polygonal, or other shape, for example. (At this time, each protrusion is provided with at least two steps at a certain height from the bottom surface.) The arrangement thereof can also be changed (angle, width, etc.) from FIG. 9 as appropriate.

Therefore, by forming at least two steps 1145p-d1 and 1145p-d2 on the protrusion 1145p of the flow characteristic providing section 1145, turbulent flow is more likely to occur in the fluid, and diffusion, stirring, or mixing of the fluid is prevented. Efficiency increases. In addition, in a channel with a small cross-sectional area, the velocity of the fluid increases and the static pressure decreases, promoting the occurrence of cavitation phenomenon, which is effective in generating fine bubbles. In addition, the steps 1145p-d1 and 1145p-d2 cut out a part of the side surface of the protrusion 1145p, and the cross-sectional area of the flow path between the protrusions 1145p increases as a result, so that the overall flow rate of the flowing fluid increases. It is expected to increase the viscosity of the fluid and reduce the pressure loss of the fluid supply device, making it more useful when the fluid has a high viscosity.

(Second embodiment)
10A and 10B show an exploded side view and a side perspective view of a fluid supply tube 200 according to a second embodiment of the present invention. This embodiment is different from the first embodiment in that a predetermined section between the swirl generating part and the fluid characteristic providing part of the internal structure is tapered, and the fluid is guided to the outflow part. The difference is that there is no longer a section. Since the other points are the same as those in the first embodiment, the same parts are given the same reference numerals and the explanation will be omitted.

In this embodiment, a predetermined section 244 between the swirl generating section 143 and the fluid characteristic providing section 145 of the internal structure 240 installed in the fluid supply pipe 200 is tapered. In other words, since the diameter of the shaft in the swirl generating section 143 is smaller than the diameter of the shaft in the swirl generating section 145, the diameter of the shaft increases gradually in order to make the change in size gentle. ing. In addition, the internal structure 240 has a fluid diffusion section 142, a vortex generation section 143, a predetermined section 244, and a flow characteristic providing section 145 integrally formed on one shaft from upstream, and a guide section on the most downstream side. The configuration is such that there is no provision for.

Also in this embodiment, the projection 145P of the flow characteristic providing section 145 is provided with one step 145p-d1 (see FIG. 5), as in the first embodiment. Alternatively, the protrusion 145p may be provided with two steps (see FIG. 8) or more as in a modification of the first embodiment. By providing one or more such steps on the protrusion, turbulence is more likely to occur in the fluid, and the efficiency of diffusion, stirring, or mixing of the fluid is increased. In addition, the flow path with a small cross-sectional area increases the velocity of the fluid, reduces static pressure, promotes the occurrence of cavitation phenomenon, and becomes effective in generating fine bubbles. In addition, the overall increase in the flow rate of the flowing fluid is expected to reduce pressure loss in the fluid supply device, which is more useful when the fluid has a high viscosity.

(Third embodiment)
11A and 11B show an exploded side view and a side perspective view of a fluid supply tube 300 according to a third embodiment of the present invention. This embodiment differs from the second embodiment in that a conical guiding section is provided at the fluid outflow section. Since other points are the same as in the second embodiment, the same parts are given the same reference numerals and the explanation will be omitted.

In this embodiment, the internal structure 340 includes a fluid diffusion section 142, a vortex generation section 143, a predetermined section 244, a flow characteristic providing section 145, and a guiding section 350 integrally formed on one shaft body from upstream, The guide portion 350 on the most downstream side has a conical shape. The fluid is guided along the conical guide portion 350 while a portion thereof rotates, and flows out from the outlet 112 of the fluid supply pipe 300.

Also in this embodiment, the projection 145P of the flow characteristic providing section 145 is provided with one step 145p-d1 (see FIG. 5), as in the first embodiment. Alternatively, the protrusion 145p may be provided with two steps (see FIG. 8) or more as in a modification of the first embodiment. By providing one or more such steps on the protrusion, turbulence is more likely to occur in the fluid, and the efficiency of diffusion, stirring, or mixing of the fluid is increased. In addition, a flow path with a narrow cross-sectional area is formed, the velocity of the fluid increases, and the static pressure decreases, promoting the occurrence of cavitation phenomenon, which is effective in generating fine bubbles. In addition, the overall increase in the flow rate of the flowing fluid is expected to reduce pressure loss in the fluid supply device, which is more useful when the fluid has a high viscosity.

(Fourth embodiment)
Next, a fluid supply pipe 400 according to a fourth embodiment of the present invention will be described with reference to FIGS. 12A and 12B. Components that are the same as those in the first embodiment will be designated by the same reference numerals, and their descriptions will be omitted, and differences will be described in detail. FIG. 12A is an exploded side view of a fluid supply pipe 400 according to the fourth embodiment, and FIG. 14B is a side perspective view of the fluid supply pipe 400. In FIGS. 14 and 15, fluid flows from the inlet 111 to the outlet 112 side.

The fluid supply pipe 400 includes a hollow shaft type second internal structure 460 housed in the pipe body 110 and a first internal structure 440 housed in the hollow part of the second internal structure 460. . The fluid supply pipe 400 inserts the first internal structure 440 into the hollow part of the second internal structure 460, stores them in the outflow side member 130 in that state, and then inserts the first internal structure 440 into the hollow part of the second internal structure 460. It is understood that it is constructed by connecting the male thread 132 on the outer peripheral surface of the outflow side member 130 and the female thread 126 on the inner peripheral surface of the inflow side member 120 with the presser plate 480 placed at the top. The fluid flowing in through the inflow port 111 flows into the hollow part of the second internal structure 460 and the inside of the outflow side member 130 .

The first internal structure 440 is formed, for example, by a method of processing a cylindrical member made of metal such as steel, a method of molding plastic (including a method of injection molding, etc.), or the like. In addition, three-dimensional printing can also be performed using a 3D printer from metal or resin materials. The first internal structure 440 includes, from the upstream side to the downstream side, a fluid diffusion section 442 that is integrally formed on a common shaft section 441 having a circular cross section, and a first swirl generation section 443. , a tapered predetermined section 444 , a first flow characteristic providing section 445 , and a first guiding section 450 . The first swirl generating section 443 corresponds to part or all of the head of the first internal structure 440, and the first flow characteristic providing section 445 corresponds to a part of the body of the first internal structure 440. Corresponds to part or all. The head portion is located on the upstream side of the tube body 110 when the first internal structure 440 is housed in the tube body 110, and the body portion is positioned on the downstream side of the head portion. When manufacturing the first internal structure 440 by processing a cylindrical member, the fluid diffusion part 442 can be formed by processing one end of the cylindrical member into a conical shape. The fluid diffusion part 442 diffuses the fluid flowing into the inflow side member 120 through the inlet 111 from the center of the tube to the outside, that is, in the radial direction. In this embodiment, the fluid diffusion part 442 has a conical shape, but the present invention is not limited to this embodiment, and the fluid diffusion part 442 can also have other shapes. In one embodiment, fluid diffuser 442 has the form of a dome.

The first swirl generating section 443 of the first internal structure 440 has a similar structure to the swirl generating section 143 of the first embodiment, and can be formed by a similar method. The first swirl generator 443 has a circular cross section and includes a shaft portion 441 having a constant diameter along the entire fluid flow direction, and three spirally formed blades. In this embodiment, the length l2 of the first swirl generating part 443 is longer than the length l1 of the fluid diffusion part 442, but shorter than the length l3 of the first flow characteristic providing part 445. Further, the radius of the portion of the fluid diffusion section 442 having the maximum cross-sectional area is the same as the radius of the shaft section 441 of the first swirl generation section 443. On the other hand, the radius of the portion of the fluid diffusion section 442 having the maximum cross-sectional area is preferably smaller than the distance from the center of the shaft section of the first swirl generation section 443 to the tip of the blade. The tips of each of the blades of the first swirl generator 443 are offset from each other by 120° in the circumferential direction of the shaft portion, and are spaced at a predetermined interval on the outer peripheral surface from one end of the corresponding shaft portion to the other end. It is formed in a counterclockwise spiral. Although the number of blades is three in this embodiment, the present invention is not limited to this embodiment. Further, the shape of the blades of the first swirl generating section 443 is such that the fluid diffused by the fluid diffusion section 442 and entering the first swirl generating section 443 causes a swirl flow while passing between the respective wings. There is no particular restriction as long as it is possible to do so. On the other hand, in this embodiment, when the first internal structure 440 is housed in the hollow part of the second internal structure 460, the first swirl generator 443 It has an outer diameter close to .

The first flow characteristic providing section 445 of the first internal structure 440 is formed downstream of the fluid diffusion section 442 and the first swirl generating section 443 . The first flow characteristic providing portion 445 includes a shaft portion 441 having a circular cross section and a constant diameter along the length direction, and a plurality of protrusions 445p protruding from the outer peripheral surface of the shaft portion. Each protrusion has a columnar shape with a substantially rhombic cross section, and a plurality of protrusions 445p are formed in a net shape. Each protrusion 445p is formed by, for example, a helical flow formed by dividing the outer circumferential surface of a cylindrical member (shaft) into a plurality of parts so as to protrude radially outward from the surface of the shaft. It is formed by cutting or grinding so that the passage and the annular closed flow passage divided into a plurality of parts in the longitudinal direction of the shaft part intersect with each other. At this time, the protrusion 445p is formed with one or more steps (see FIGS. 5 and 8), making the flow path complicated, as in the first embodiment and its modifications. The diameter of the shaft portion of the first flow characteristic providing portion 445 is larger than the diameter of the shaft portion of the first swirl generating portion 443 . Therefore, a tapered predetermined section 444 is provided so that fluid can flow smoothly between the two. In another embodiment, the diameter of the shaft portion 441 of the first flow characteristic providing portion 445 is the same as the diameter of the shaft portion 441 of the first swirl generating portion 443 . In the present embodiment, the first flow characteristic providing section 445 is arranged on the inner circumferential surface of the second internal structure 460 when the first internal structure 440 is housed in the hollow part of the second internal structure 460. The outer diameters are close to each other. The cross-sectional shape of the protrusion is not limited to a substantially rhombic shape, but may be triangular or other polygonal.

The first guide portion 450 of the first internal structure 440 is formed, for example, by processing the downstream end of a cylindrical member into a dome shape. The shaft portion 441 of the first flow characteristic providing portion 445 extends between the first flow characteristic providing portion 445 and the first guiding portion 450 . In this embodiment, the length l4 of this shaft extension 446 is the length l4 of the first internal structure 440 when the first internal structure 440 is housed in the hollow part of the second internal structure 460. The guide portion 450 is configured to protrude outside the second internal structure 460. In one example, the length l4 of the axial extension 446 is the same as the length l5 of the second guide portion 470 of the second internal structure 460. In this embodiment, the first guide part 450 has a dome shape, but the present invention is not limited to this embodiment, and the first guide part 450 can also have another shape (for example, a conical shape). It is. Alternatively, first internal structure 440 may not include a guide.

The second internal structure 460 has the form of a hollow shaft, and is formed by, for example, a method of processing a cylindrical member made of metal such as steel, or a method of molding plastic (for example, injection molding). In addition, three-dimensional printing can also be performed using a 3D printer from metal or resin materials. The second internal structure 460 includes, from the upstream side to the downstream side, a second swirl generating section 463 that is integrally formed on a common hollow shaft member 461, and a predetermined tapered section 464. , a second flow characteristic providing section 465, and a second guiding section 470. The second swirl generating section 463 corresponds to part or all of the head of the second internal structure 460, and the second flow characteristic providing section 465 corresponds to a part of the body of the second internal structure 30. Corresponds to part or all. The head portion is located on the upstream side of the tube body 110 when the second internal structure 460 is housed in the tube body 110, and the body portion is positioned on the downstream side of the head portion. In this embodiment, the inner diameter (that is, the diameter of the hollow part) of the second internal structure 460 is larger on the inlet side than on the outlet side. The first internal structure 440 is inserted through the inlet 471 of the hollow part of the second internal structure 460, and the first internal structure 440 of the first internal structure 440 is inserted through the outlet 472 of the hollow part of the second internal structure 460. One guide portion 450 protrudes.

The second swirl generating section 463 of the second internal structure 460 has a similar structure to the swirl generating section 143 of the first embodiment, and can be formed by a similar method. The second swirl generator 463 includes a shaft portion 461 having a circular cross section and a constant diameter along its length, and three spirally formed blades. When manufacturing the second internal structure 460 by processing a cylindrical member, the second swirl generating portion 463 is formed by processing one end of the cylindrical member. The tips of each of the blades of the second swirl generating section 463 are offset from each other by 120° in the circumferential direction of the shaft, and are spaced apart from one end of the shaft at a predetermined interval on the outer peripheral surface. It is formed in a clockwise spiral. Although the number of blades is three in this embodiment, the present invention is not limited to this embodiment. Further, the shape of the wings of the second swirl generating section 463 is such that the fluid that has been diffused by the fluid diffusion section 442 of the first internal structure 440 and enters the second swirl generating section 463 passes between each wing. There is no particular restriction as long as it can generate a swirling flow during the process. In this embodiment, the second swirl generating section 463 is located close to the inner circumferential surface of the cylindrical portion 134 of the outflow side member 130 of the tube body 110 when the second internal structure 460 is housed in the tube body 110. It has an outer diameter of approximately

The second flow characteristic providing section 465 of the second internal structure 460 has a similar structure to the flow characteristic providing section 145 of the first embodiment, and can be formed by a similar method. Specifically, the second flow characteristic providing portion 465 is formed of a shaft portion having a circular cross section and a constant diameter along the length direction of the shaft portion 461, and a shaft portion protruding from the outer circumferential surface of the shaft portion. and a plurality of protrusions 465p. Each of the protrusions 465p has a columnar shape with a substantially rhombic cross section, and the plurality of protrusions 465p are formed in a net shape. Each of the protrusions is formed by, for example, a helical channel formed by dividing the outer circumferential surface of the cylindrical member (shaft) into a plurality of parts so as to protrude radially outward from the surface of the shaft 461. It is formed by cutting, grinding, etc. so that the annular closed flow path divided into a plurality of parts in the longitudinal direction of the shaft intersect with each other. At this time, the protrusion 465p is formed with one or more steps (see FIGS. 5 and 8), complicating the flow path, as in the first embodiment and its modifications. The diameter of the shaft portion of the second flow characteristic providing portion 465 is larger than the diameter of the shaft portion of the second swirl generating portion 463, and a predetermined tapered section 464 is provided to allow fluid to flow smoothly between the two. . In this embodiment, when the second internal structure 460 is housed in the tube body 110, the second flow characteristic providing section 465 is provided on the inner circumferential surface of the cylindrical portion 134 of the outflow side member 130 of the tube body 110. The outer diameters are close to each other.

The second guide portion 470 of the second internal structure 460 is formed, for example, by processing the downstream end portion of a cylindrical member into a truncated dome shape (a dome with a cut-off head). As illustrated, the shaft portion 461 of the second flow characteristic providing portion 465 extends between the second flow characteristic providing portion 465 and the second guiding portion 470 . The length of the shaft extension 466 is determined based on, for example, processing convenience and the dimensions of the first internal structure 440. Note that the second guide portion 470 is not limited to the shape of a truncated dome, and may have other shapes. In other embodiments, the second guiding portion 470 is formed into a frusto-conical shape.

It is preferable that the inner diameter of the hollow portion of the second internal structure 460 on the inflow port 471 side is larger than the inner diameter on the outflow port 472 side. In this embodiment, the second internal structure 460 has the same inner diameter from the inlet 471 to the axial extension 466 of the second flow characteristic providing section 465, and has a smaller inner diameter at the second guiding section 470. It has an inner diameter. Therefore, a step 468 exists at the boundary between the shaft extension portion 466 and the second guiding portion 470 in the hollow portion of the second internal structure 460 . As a result, the first internal structure 440 can be stored in the hollow part of the second internal structure 460 through the inlet 471 of the second internal structure 460, and the first internal structure 440 can be It is possible to prevent the liquid from escaping to the outside through the outlet 472. The inner diameter of the second guiding portion 470 is larger than the outer diameter of the first guiding portion 450 of the first internal structure 440 .

As shown in FIG. 12A, the fluid supply pipe 400 includes a holding plate 480, and the holding plate 480 is made of, for example, metal such as steel or plastic. In this embodiment, as shown in the drawings, the retaining plate 480 prevents the first internal structure 440 from coming off through the inlet 111 of the tube body 110. Specifically, after putting the first internal structure 440 into the hollow part of the second internal structure 460, they are stored in the outflow side member 130 in that state, and the first internal structure 440 is With the presser plate 480 placed at the top of the second internal structure 460 so that the fluid diffusion portion 442 protrudes through the presser plate 480, the external thread 132 on the outer peripheral surface of the outflow side member 130 and the inner surface of the inflow side member 120 are connected. The fluid supply pipe 400 is configured by threaded connection with the female thread 126 on the circumferential surface. In the above assembled state, the first internal structure 440 cannot be removed from the inlet 111 of the tube body 110 by the presser plate 480, and at the same time, the radius of the outlet 472 of the second internal structure 460 is larger than the inlet 471. Because the radius is smaller than the radius of , it cannot be removed from the outlet 472 of the second internal structure 460 . The holding plate 480 serves to restrain the first internal structure 440 in the hollow part of the second internal structure 460.

The flow of the fluid while it passes through the fluid supply pipe 400 will be described below. While passing through the space of the tapered part 124 of the inflow side member 120, the fluid hits the fluid diffusion part 442 of the protruding first internal structure 440, and moves outward from the center of the fluid supply pipe 400 (i.e., from the radius). direction). A part of the inflowed fluid flows into the hollow part of the second internal structure 460 in which the first internal structure 440 is housed, and the rest flows into the hollow part of the second internal structure 460 in which the second internal structure 460 is housed. It flows into the space inside the outflow side member 130.

The fluid flowing through the hollow part of the second internal structure 460 in which the first internal structure 440 is housed flows through the three wings spirally formed in the counterclockwise direction of the first swirl generator 443. pass through the space. The fluid diffusion unit 442 functions to guide the fluid so that the fluid flowing through the pipe 9 effectively enters the first swirl generation unit 443 . The fluid is turned into a strong swirl by each blade of the first swirl generating section 443 and sent to the first flow characteristic providing section 445 .

Then, the fluid passes between a plurality of protrusions 445p regularly formed on the outer circumferential surface of the shaft portion of the first flow characteristic providing portion 445. These plurality of protrusions form a plurality of narrow channels 445r. When the fluid passes through the plurality of narrow channels 445r formed by the plurality of protrusions 445p, a large number of minute vortices are generated and a cavitation phenomenon occurs, resulting in the generation of fine bubbles. The above structure of the first flow characteristic providing section 445 is also useful when mixing two or more fluids having different properties.

In other words, the first internal structure 440 is formed from upstream with a large cross-sectional area (the first swirl generating part 443) to downstream with a small cross-sectional area (formed between the plurality of protrusions 445p of the first flow characteristic providing part 445). It has a structure that allows fluid to flow into the flow path. The first internal structure 440 of the fluid supply pipe 400 according to the present embodiment induces the above cavitation phenomenon, and a large number of fine bubbles are generated while the fluid passes through the first flow characteristic providing part 445. Fine bubbles improve fluid permeability and lubricity, and improved permeability results in increased cooling efficiency.

Fluid flows past the first flow characteristic providing portion 445 toward the end of the first internal structure 440 . The fluid flows from the plurality of narrow channels 445r formed by the plurality of protrusions 445p of the first flow characteristic providing part 445 toward the first guide part 25 formed at the end of the first internal structure 440. When the fluid flows, the flow path widens rapidly. At this time, the fluid is guided to flow along the surface of the first guide part 450 by the curved surface of the dome-shaped first guide part 25 of the first internal structure 440, and the fluid is guided to flow along the surface of the first guide part 450. The fluid guided toward the center by the portion 450 passes through the tapered portion 136 of the outlet member 130 and flows out through the outlet 112.

The fluid flowing through the internal space of the outflow side member 130 in which the second internal structure 460 is housed flows between the three wings spirally formed in the counterclockwise direction of the second swirl generator 463. go through. The fluid is turned into a strong swirl by each blade of the second swirl generating section 463 and sent to the second flow characteristic providing section 465 . Then, the fluid passes between a plurality of protrusions 465p regularly formed on the outer peripheral surface of the shaft portion of the second flow characteristic providing portion 465. Similar to the first internal structure 440, the second internal structure 460 is arranged from upstream having a large cross-sectional area (second swirl generating part 463) to downstream having a small cross-sectional area (second flow characteristic providing part 465). It has a structure that allows fluid to flow into a flow path 465r) formed between a plurality of protrusions 465p. Due to the above-described structure of the second flow characteristic providing section 465, a large number of minute vortices are generated in the fluid, and a cavitation phenomenon occurs, resulting in the generation of fine bubbles in the fluid.

Fluid flows past the second flow characteristic providing portion 465 toward the end of the second internal structure 460 . The fluid flows from the plurality of narrow channels formed by the plurality of protrusions of the second flow characteristic providing part 465 toward the second guide part 470 formed at the end of the second internal structure 460. Then, the flow path suddenly becomes wider, and the fluid is guided to flow along the surface of the second guide portion 470. The fluid guided toward the center by the truncated dome-shaped second guide portion 470 passes through the tapered portion 136 of the outlet member 130 and flows out through the outlet 112 .

The fluid that has flowed through the hollow part of the second internal structure 460 and the fluid that has flowed through the internal space of the outflow side member 130 are merged at the tapered part 136 and then flowed out through the outflow port 112.

In this embodiment, one member is processed to form the fluid diffusion section 442 of the first internal structure 440, the first swirl generation section 443, the first flow characteristic providing section 445, and the first guide. 450, the first internal structure 440 is manufactured as one integrated component. Furthermore, since the second swirl generating section 463, the second flow characteristic providing section 465, and the second guiding section 470 of the second internal structure 460 are formed by processing one member, the second The internal structure 460 is manufactured as one integrated part. The above structure and dimensional relationship allows self-alignment of the first internal structure 440, the second internal structure 460, and the presser plate 480. Therefore, with the first internal structure 440 placed in the hollow part of the second internal structure 460, the second internal structure 460 is placed inside the outflow side member 130, and the presser plate 480 is placed inside the first internal structure 460. After being placed at the top of the internal structure 440, the fluid supply pipe 400 can be manufactured by a simple process of connecting the male thread 132 of the outflow side member 130 and the female thread 126 of the inflow side member 120. That is, it is easy to assemble the parts of the fluid supply pipe 400, and the time required to manufacture the fluid supply pipe 400 is shortened.

Although in the fourth embodiment two internal structures are housed in the tube body, embodiments providing a multilayer fluid supply tube including three or more internal structures are also possible. Each internal structure includes a flow characteristic providing section, thereby generating a large amount of fine bubbles in the fluid flowing into the fluid supply pipe. By providing one or more steps on the protrusion of the fluid characteristic providing portion of at least one of the plurality of internal structures, turbulence is more likely to occur in the fluid, and the diffusion and agitation of the fluid are increased. Alternatively, the efficiency of mixing is increased. In addition, a flow path with a narrow cross-sectional area is formed, the velocity of the fluid increases, and the static pressure decreases, promoting the occurrence of cavitation phenomenon, which is effective in generating fine bubbles. In addition, the overall increase in the flow rate of the flowing fluid is expected to reduce pressure loss in the fluid supply device, which is more useful when the fluid has a high viscosity.

(Fifth embodiment)
Next, a fluid supply pipe 500 according to a fifth embodiment of the present invention will be described with reference to FIGS. 13A and 13B. Descriptions of the same configurations as those in the first embodiment will be omitted, and differences will be described in detail. The same drawing symbols are used for the same components as those in the first embodiment. FIG. 13A is an exploded side view of a fluid supply pipe 500 according to the fifth embodiment, and FIG. 13B is a side perspective view of the fluid supply pipe 500.

As shown, the fluid supply tube 500 includes a tube body 110 and an internal structure 540. The internal structure 540 includes, from the upstream side to the downstream side, a fluid diffusion section 542 integrally formed on a common shaft section 541 having a circular cross section, a first swirl generation section 543, and a first swirl generation section 543. The flow characteristic providing section 545 includes a first flow characteristic providing section 545, a second swirl generating section 547, a second flow characteristic providing section 549, and a dome-shaped guiding section 550. The internal structure 540 is formed, for example, by a method of processing a cylindrical member made of metal such as steel, a method of molding plastic (including a method of injection molding, etc.), or the like. In addition, three-dimensional printing can also be performed using a 3D printer from metal or resin materials.

The fluid diffusion section 542 has a similar structure to the fluid diffusion section 142 of the first embodiment, and can be formed by a similar method. The first swirl generator 543 corresponds to part or all of the head of the internal structure 340 located upstream of the tube body 110 when the internal structure 540 is housed in the tube body 110. Each of the first swirl generating section 543 and the second swirl generating section 547 has the same structure as the swirl generating section 143 of the first embodiment, and can be formed by the same method. Each of the first flow characteristic providing section 545 and the second flow characteristic providing section 549 has a similar structure to the flow characteristic providing section 145 of the first embodiment, and can be formed by a similar method.

The guide portion 550 is formed, for example, by processing the downstream end of a cylindrical member into a dome shape. The guiding part 550 guides the fluid flowing inside the fluid supply pipe 500 toward the center of the pipe, so that the fluid can be smoothly discharged through the outlet 112.

In at least one of the plurality of protrusions 545p and 549p arranged in a net shape of the first and second flow characteristic providing parts 545 and 549, there is a step, as in the first embodiment or its modification. One or more are formed. Therefore, turbulence is more likely to occur in the fluid, and the efficiency of diffusion, stirring, or mixing of the fluid increases. In addition, a flow path with a narrow cross-sectional area is formed, the velocity of the fluid increases, and the static pressure decreases, promoting the occurrence of cavitation phenomenon, which is effective in generating fine bubbles. In addition, the overall increase in the flow rate of the flowing fluid is expected to reduce pressure loss in the fluid supply device, which is more useful when the fluid has a high viscosity.

In the present embodiment, the guide portion 550 of the internal structure 540 is formed by processing the downstream end of the cylindrical member into a dome shape, but it may have a conical shape or other shape. Alternatively, the guide portion may be omitted as in the second embodiment. Furthermore, the diameter of the circular cross section of the shaft 541 of the internal structure 540 is the same in each part in FIGS. 13A and 13B, but the diameter of the shaft of the first swirl generating section 543 is the same. , the diameter of the shaft of the first flow characteristic providing section 545 is smaller than the diameter of the shaft of the second swirl generating section 547, and the diameter of the shaft of the second flow characteristic providing section 549 is smaller than the diameter of the shaft of the second flow characteristic providing section 549. It is also possible to make it smaller than the size of . In addition, the number of spiral channels and the number of annular closed channels in the first flow characteristic providing section 545 are the number of spiral channels and the number of annular closed channels in the second flow characteristic providing section 549. (As a result, the size of the protrusion 545p of the first flow characteristic providing part 545 becomes larger than the size of the protrusion 549p of the second flow characteristic providing part 549, It is also possible to change the cross-sectional area of the flow path 545r of the characteristic providing section 545 to be larger than the cross-sectional area of the flow path 549r of the second flow characteristic providing section 549.

In the above description of each embodiment, an example was mainly described in which the fluid supply device of the present invention is applied to a machine tool to discharge coolant, but the present invention is applicable to various applications for supplying fluid. For example, it is applicable to shower nozzles. In this case, if water or hot water at a predetermined temperature flows into the fluid supply device, the internal structure imparts the above-described flow characteristics to the water and then discharges it, thereby improving the cleaning effect. Alternatively, the present invention is also applicable to fluid mixing devices. In this case, when a plurality of types of fluids having different characteristics flow into the fluid supply device, the internal structure imparts the above-described flow characteristics to the plurality of types of fluids, and the fluids are mixed and discharged. Furthermore, the present invention can be used in a hydroponic cultivation apparatus to increase dissolved oxygen in supplied water to maintain or increase the amount of oxygen in water (dissolved oxygen concentration). In addition, for contaminant removal equipment, specific gases such as air and various gases (hydrogen, ozone, oxygen, etc.) are dissolved in liquids (e.g. water), and liquids containing fine bubbles of gases are also used. It can also be applied when it is supplied as (water).

Although the present invention has been described above using a plurality of embodiments, the present invention is not limited to these embodiments. Those skilled in the art to which the present invention pertains will be able to derive many variations and other embodiments of the present invention from the above description and associated drawings. Although specific terms are used herein, they are used in a general sense for purposes of explanation only and not for purposes of limitation. Various modifications may be made without departing from the general inventive concept and spirit as defined by the appended claims and their equivalents.

1 Grinding device 2 Grinding blade (grindstone)
4 Grinding part W Workpiece G Grinding part 5 Fluid supply part 6 Nozzle 7, 8 Joint part 9 Piping P, 100, 200, 300, 400, 500 Fluid supply pipe 110 Pipe body 120 Inflow side member 130 Outflow side member 140, 1140, 240, 340, 540 Internal structure 141, 441, 461, 541 Shaft 145p, 1145p, 445p, 465p, 545p, 549p Projection 145r, 1145r, 445r, 465r, 545r, 549r Channel 145p-d1, 1145 -d1, 1145-d2 Step 440 First internal structure 460 Second internal structure 142, 442, 542 Fluid diffusion section 143, 443, 463, 543, 547 Swirl generation section 145, 1145, 445, 465, 545 , 549 flow characteristic providing section 150, 350, 450, 470, 550 guiding section

Claims (22)

A fluid supply device, comprising:
A storage body,
an internal structure stored in the storage body;
has
The internal structure includes a shaft portion and a plurality of projections protruding from an outer peripheral surface of the shaft portion,
The plurality of protrusions are each formed with at least one step,
Fluid supply device. The shaft portion of the internal structure has a circular cross section,
The plurality of protrusions are formed by intersecting a spiral flow path that is connected in a spiral shape by dividing the circumference of the shaft into a plurality of parts, and a closed flow path that is divided into a plurality of parts in the longitudinal direction of the shaft. 2. The fluid supply device according to claim 1, wherein the protrusion has at least one step formed in parallel to the circumferential direction of the shaft. 3. The fluid supply device according to claim 2, wherein each of the plurality of projections has two or more steps formed in parallel to the circumferential direction of the shaft. A fluid supply device, comprising:
A storage body,
an internal structure stored in the storage body;
has
The storage body includes an inlet and an outlet,
The internal structure includes a first portion and a second portion integrally formed on a common shaft portion having a circular cross section,
The first part is located on the upstream side of the storage body when the internal structure is stored in the storage body, and includes a shaft portion and a wing formed in a spiral shape to generate a swirl flow in the fluid. It's here,
The second portion is located downstream of the first portion and includes a shaft portion and a plurality of projections protruding from the outer peripheral surface of the shaft portion,
The plurality of protrusions of the second portion are formed by intersecting a spiral flow path that is connected in a spiral shape by dividing the circumference of the shaft into a plurality of parts, and a closed flow path that is divided into a plurality of parts in the longitudinal direction of the shaft. characterized in that each of the plurality of projections is formed with at least one step parallel to the circumferential direction of the shaft,
Fluid supply device. The internal structure further includes a fluid diffusion part located upstream of the first part, which diffuses the fluid flowing in through the inlet of the storage body in a radial direction from the center and supplies the fluid to the first part. The fluid supply device according to claim 4, characterized in that: The plurality of protrusions of the second portion of the internal structure are formed in a net shape, and each protrusion has a columnar shape with a substantially rhombic cross section, and extends parallel to the circumferential direction of the shaft. The fluid supply device according to claim 4, wherein at least one step is formed. 5. The fluid supply device according to claim 4, wherein the internal structure further includes a guide portion at a downstream end that guides the fluid toward the center. An internal structure housed in a housing of a fluid supply device,
The internal structure includes a shaft portion and a plurality of projections protruding from an outer peripheral surface of the shaft portion,
The plurality of protrusions are each formed with at least one step,
Internal structure. The shaft portion of the internal structure has a circular cross section,
The plurality of protrusions are formed by intersecting a spiral flow path that is connected in a spiral shape by dividing the circumference of the shaft into a plurality of parts, and a closed flow path that is divided into a plurality of parts in the longitudinal direction of the shaft. 9. The internal structure according to claim 8, wherein the protrusion has at least one step formed in parallel to the circumferential direction of the shaft. 10. The internal structure according to claim 9, wherein each of the plurality of projections has two or more steps formed in parallel to the circumferential direction of the shaft. An internal structure housed in a housing of a fluid supply device,
The internal structure includes a first portion and a second portion integrally formed on a common shaft portion having a circular cross section,
The first part is located on the upstream side of the storage body when the internal structure is stored in the storage body, and includes a shaft portion and a wing formed in a spiral shape to generate a swirl flow in the fluid. It's here,
The second portion is located downstream of the first portion and includes a shaft portion and a plurality of projections protruding from the outer peripheral surface of the shaft portion,
The plurality of protrusions of the second portion are formed by intersecting a spiral flow path that is connected in a spiral shape by dividing the circumference of the shaft into a plurality of parts, and a closed flow path that is divided into a plurality of parts in the longitudinal direction of the shaft. characterized in that each of the plurality of projections is formed with at least one step parallel to the circumferential direction of the shaft,
Internal structure. A fluid supply device, comprising:
internal structure and
a storage body for storing the internal structure;
including;
The storage body includes an inlet and an outlet,
The internal structure includes a first portion, a second portion, a third portion, and a fourth portion integrally formed on a common shaft portion having a circular cross section,
The first part is located on the upstream side of the storage body when the internal structure is stored in the storage body, and includes a shaft portion and a wing formed in a spiral shape to generate a swirl flow in the fluid. It's here,
The second portion is located downstream of the first portion and includes a shaft portion and a plurality of projections protruding from the outer peripheral surface of the shaft portion,
The third portion is located downstream of the second portion and includes a shaft portion and a blade formed in a spiral shape to generate a swirl flow in the fluid,
The fourth portion is located downstream of the third portion and includes a shaft portion and a plurality of projections protruding from the outer circumferential surface of the shaft portion,
The plurality of protrusions of the fourth portion are each formed with at least one step parallel to the circumferential direction of the shaft portion,
Fluid supply device. 13. The fluid supply device according to claim 12, wherein each of the plurality of projections of the second portion has at least one step formed in parallel to the circumferential direction of the shaft. A fluid supply device, comprising:
a first internal structure;
a second internal structure;
a storage body for storing the first internal structure and the second internal structure;
including;
The storage body includes an inlet and an outlet,
The first internal structure includes a head portion integrally formed on a common shaft portion having a circular cross section, and a body portion,
The head is located on the upstream side of the storage body when the first internal structure is stored in the storage body, and includes a shaft portion and wings formed in a spiral shape to generate a swirl flow in the fluid. contains,
The body portion is located downstream from the head and includes a shaft portion and a plurality of projections protruding from the outer peripheral surface of the shaft portion,
The second internal structure in the form of a hollow shaft includes a head integrally formed on the hollow shaft and a body,
The head is located on the upstream side of the storage body when the second internal structure is stored in the storage body, and includes a shaft portion and wings formed in a spiral shape to generate a swirl flow in the fluid. contains,
The body portion is located downstream from the head and includes a shaft portion and a plurality of projections protruding from the outer peripheral surface of the shaft portion,
At least a portion of the first internal structure is housed in the hollow part of the second internal structure,
Each of the plurality of protrusions of the body portion of the second internal structure is characterized in that at least one step is formed in parallel to the circumferential direction of the shaft portion.
Fluid supply device. The fluid according to claim 14, wherein each of the plurality of protrusions of the body portion of the first internal structure has at least one step formed in parallel to the circumferential direction of the shaft portion. Feeding device. An internal structure of a fluid supply device,
It includes a first part, a second part, a third part, and a fourth part integrally formed on a common shaft part having a circular cross section,
The first part is located on the upstream side of the storage body when the internal structure is stored in the storage body, and includes a shaft portion and a wing formed in a spiral shape to generate a swirl flow in the fluid. It's here,
The second portion is located downstream of the first portion and includes a shaft portion and a plurality of projections protruding from the outer peripheral surface of the shaft portion,
The third portion is located downstream of the second portion and includes a shaft portion and a blade formed in a spiral shape to generate a swirl flow in the fluid,
The fourth portion is located downstream of the third portion and includes a shaft portion and a plurality of projections protruding from the outer circumferential surface of the shaft portion,
Each of the plurality of protrusions of the fourth portion is characterized in that at least one step is formed in parallel to the circumferential direction of the shaft portion.
Internal structure. A combination of first and second internal structures of a fluid supply device, the combination comprising:
The first internal structure includes a head portion integrally formed on a common shaft portion having a circular cross section, and a body portion,
The head is located on the upstream side of the storage body when the first internal structure is stored in the storage body, and includes a shaft portion and wings formed in a spiral shape to generate a swirl flow in the fluid. contains,
The body portion is located downstream from the head and includes a shaft portion and a plurality of projections protruding from the outer peripheral surface of the shaft portion,
The second internal structure is in the form of a hollow shaft and includes a head integrally formed on the hollow shaft and a body,
The head is located on the upstream side of the storage body when the second internal structure is stored in the storage body, and includes a shaft portion and wings formed in a spiral shape to generate a swirl flow in the fluid. contains,
The body portion is located downstream from the head and includes a shaft portion and a plurality of projections protruding from the outer peripheral surface of the shaft portion,
At least a portion of the first internal structure is housed in the hollow part of the second internal structure,
Each of the plurality of protrusions of the body portion of the second internal structure is characterized in that at least one step is formed in parallel to the circumferential direction of the shaft portion.
A combination of the first and second internal structures. A machine tool that cools a tool or a workpiece by flowing a cooling liquid into the fluid supply device including the internal structure according to any one of claims 1 to 17, imparting predetermined flow characteristics, and then discharging it to a tool or workpiece. . 18. A shower nozzle in which water or hot water flows into a fluid supply device including the internal structure according to any one of claims 1 to 17, gives predetermined flow characteristics, and then discharges the water or hot water to enhance the cleaning effect. A plurality of fluids having different characteristics are introduced into the fluid supply device including the internal structure according to any one of claims 1 to 17, and predetermined flow characteristics are imparted to the fluid supply device, and the plurality of fluids are mixed and then discharged. Fluid mixing device. 18. A hydroponic cultivation apparatus, wherein water flows into the fluid supply apparatus including the internal structure according to claim 1, increases dissolved oxygen, and then discharges the water. A contaminant removal device, wherein water in which a specific gas is dissolved flows into a fluid supply device including the internal structure according to any one of claims 1 to 17, and the specific gas in the form of fine bubbles is discharged.