Fluid stirring device

Abstract

The present invention provides a fluid stirring device that can increase the turbulence formation ratio and reduce resistance in the flow path. [Solution] Fluid flows in through a fluid inlet pipe 4 provided in one cover plate 2 that closes one opening of a cylindrical tube 1, is stirred by a plurality of agitators 7 provided inside the tube 1, and reaches a cover plate 3 that closes the other opening of the tube 1, where it reverses direction. A conduit 6 is provided in the center of the tube 1, and the reversed fluid flows into the conduit 6 while being stirred by each agitator 7, and flows out through a fluid outlet pipe 5 provided in the other cover plate 3 while communicating with the conduit 6. Each agitator 7 is coil spring-shaped with a mostly circular arc 71 portion along the inner wall surface of the tube 1 and a transverse portion 73 that extends in a direction traversing the inside of the tube 1, and when the fluid reverses direction and flows, it collides with the transverse portion 73 and becomes turbulent.

Description

【Technical Field】 【0001】 The invention of this application relates to a fluid stirring technology in an air conditioning system or the like. 【Background Art】 【0002】 In various fields of industry, there are many cases where it is necessary to stir a fluid for purposes such as mixing and subdivision. For example, in an air conditioning system, the fluid circulated for heat exchange may be stirred from the viewpoint of improving energy efficiency, and a fluid stirring device is used. More specifically, in an air conditioning system, various refrigeration facilities, freezing facilities, etc., a compressor is used to utilize adiabatic compression and adiabatic expansion of the fluid. Lubricating oil (refrigeration machine oil) is mixed with the fluid (refrigerant) passed through the compressor. At this time, although fluorocarbons and the like used as refrigerants have a small molecular structure and little resistance in the flow path, refrigeration machine oil has a large molecular structure and the molecules are easily bonded. For this reason, a large resistance occurs in the flow path, resulting in an increase in the load of the compressor. An increase in the load of the compressor means that a large amount of power (electric power) is consumed in the compressor, which means a deterioration in energy efficiency in air conditioning and the like. If the refrigeration machine oil can be finely crushed and circulated together with the refrigerant, the load of the compressor will decrease, and an improvement in energy efficiency can be expected. For this reason, conventionally, a fluid stirring device used for this kind of purpose has been proposed, and an example thereof is shown in Patent Document 1. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent No. 6300339 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 Using a fluid agitator like the one shown in Patent Document 1 allows the refrigerant oil to be broken down and sent into the flow path, thereby reducing the compressor load and improving energy efficiency. However, the fluid agitator shown in Patent Document 1 does not have a high turbulence formation ratio and cannot fully meet the recent demands for energy saving and reduced power consumption. The present invention was made to solve the above-mentioned problems and aims to provide a fluid stirring device that can increase the turbulence formation ratio and reduce resistance in the flow path. [Means for solving the problem] 【0005】 To solve the above problems, an invention of a fluid stirring device is disclosed in this specification. The disclosed fluid stirring device comprises a cylindrical tube, a pair of caps that close the openings at both ends of the tube, a conduit fixed inside the tube, and a plurality of stirring bodies. One of the pair of lids is provided with a fluid inlet pipe, and the other lid is provided with a fluid outlet pipe. The conduit is positioned in the center of the pipe so that its length aligns with the central axis of the pipe, with one end facing the space inside the pipe and the other end communicating with the fluid outlet pipe. Multiple stirring bodies are coil spring-shaped, spirally formed around an axis located off-center from the central axis of the tube, and have a mostly arc-shaped portion that extends in a partially arc shape along the inner wall surface of the tube when viewed in a plan view from a plane perpendicular to the central axis of the tube, and a transverse portion that extends in a direction that traverses the inside of the tube. Furthermore, the transverse sections of the pipes face each other, separated by a line that passes through the central axis of the pipe and is perpendicular to the central axis. Furthermore, in order to solve the above problems, the fluid stirring device may have a configuration in which each stirred body has a small partial arc portion that partially surrounds the conduit in a plan view taken from a plane perpendicular to the central axis of the pipe, and the transverse portion is the part that connects the large part and the small part. Furthermore, in order to solve the above problems, in a fluid stirring device, the inlet pipe may be provided at a position that is not adjacent to the point where the transverse portions face each other when viewed in the circumferential direction around the central axis of the pipe body. Furthermore, in order to solve the above problems, the transverse portion of the fluid stirring device may be a straight portion extending parallel to the radial direction. [Effects of the Invention] 【0006】 As explained below, since each agitator has a transverse section, a large turbulent flow effect is exerted in the return flow that reverses at the outlet side cover and returns to the outlet side cover, increasing the overall turbulence formation ratio and significantly improving the agitation function. Furthermore, if each agitator has a small arc-shaped section that surrounds almost half of the conduit on the central side of the conduit, and the transverse section is the part that connects the large arc-shaped section and the small arc-shaped section, then it is possible to use conduits of an appropriate thickness while reducing the spacing between opposing transverse sections, thereby achieving the effect that the turbulence effect in the transverse section is not impaired. If the inlet pipe is positioned so that, when viewed in the circumferential direction around the central axis of the pipe body, it is not possible to prevent a decrease in fluid stirring action that occurs when using the transverse section. [Brief explanation of the drawing] 【0007】 [Figure 1] This is a schematic front view of a fluid stirring device according to an embodiment of the device. [Figure 2] This is a schematic plan cross-sectional view of a fluid stirring device according to an embodiment. [Figure 3] This is a schematic perspective view of the agitator. [Figure 4] This is a schematic perspective view of the agitator. [Figure 5] This is a schematic front cross-sectional view illustrating the operation of the fluid stirring device according to the embodiment. [Figure 6] This is a schematic plan cross-sectional view illustrating the operation of the fluid stirring device according to the embodiment. [Figure 7] This is a schematic perspective cross-sectional view illustrating the operation of the fluid stirring device according to the embodiment. [Figure 8] This is a schematic plan view showing another embodiment. [Figure 9] This is a schematic plan view showing another embodiment. [Modes for carrying out the invention] 【0008】 Next, embodiments for carrying out the invention of this application will be described. Figures 1 and 2 are schematic diagrams of a fluid stirring device according to an embodiment, where Figure 1 is a schematic front cross-sectional view and Figure 2 is a schematic plan cross-sectional view. The fluid agitator shown in Figure 1 is a device installed in piping that circulates refrigerant in air conditioning systems, various refrigeration equipment, or various freezing equipment. This fluid agitator comprises a cylindrical pipe 1. 【0009】 The pipe body 1 is designed to allow fluid to flow into it for agitation, and has a pair of lids 2 and 3 that close the openings at both ends. One lid 2 is on the inlet side, and the other lid 3 is on the outlet side. For the sake of explanation, one lid 2 will be referred to as the inlet side lid, and the other lid 3 as the outlet side lid. In the example in Figure 1, the upper side is the inlet side, with the upper part being the inlet side cover 2 and the lower part being the outlet side cover 3. This is just one example; the upper side may be the outlet side and the lower side the inlet side, and the inlet and outlet sides may be arranged in a left-right direction. 【0010】 The inlet-side cover 2 and the outlet-side cover 3 are hemispherical or bowl-shaped, and the circular opening is approximately the same size as the opening of the pipe body 1. In this embodiment, the pipe body 1, the inlet-side cover 2, and the outlet-side cover 3 are made of metal, for example, stainless steel, and are manufactured by forming methods such as bending. They may also be made of metals other than stainless steel, for example, iron formed by casting. In this embodiment, the inlet-side cover 2 and the outlet-side cover 3 are fixed to the pipe body 1 by welding, but they may also be fixed by screwing or bonding. 【0011】 As shown in Fig. 1, an inflow pipe 4 is provided in the inflow side lid portion 2, and an outflow pipe 5 is provided in the outflow side lid portion 3. The inflow pipe 4 is fixed to the inflow side lid portion 2 in a posture extending parallel to the central axis of the pipe body 1. As shown in Figs. 1 and 2, the fixed position of the inflow pipe 4 is a position (eccentric) deviated from the central axis of the pipe body 1. As shown in Fig. 1, the tip surface of the inflow pipe 4 is an inclined surface with respect to the length direction of the pipe. The inclined direction extends most at the central side of the pipe body 1 and becomes the front side direction as it goes to the outside. The configuration of making the tip surface inclined like this is for directing the inflowing fluid to the inner wall surface (inner peripheral surface) of the pipe body 1. 【0012】 On the other hand, the outflow pipe 5 is fixed at a position coaxial with the central axis of the pipe body 1 and extends coaxially. A hole for fitting the inflow pipe 4 is provided in the inflow side lid portion 2, and the inflow pipe 4 is fitted into this hole and sealed. The same applies to the outflow pipe 5. The inflow pipe 4 and the outflow pipe 5 are made of metal such as hard steel, copper, or stainless steel. In addition, as shown in Fig. 1, an inflow side connecting pipe 41 is connected to the inflow pipe 4, and an outflow side connecting pipe 51 is connected to the outflow pipe 5. These connecting pipes 41 and 51 are pipes for relay for attachment to piping and are often made of copper. 【0013】 As shown in Fig. 1, a conduit 6 is provided at the center inside the pipe body 1. The conduit 6 is a pipe for guiding the stirred fluid to the outflow pipe 5. In this embodiment, the conduit 6 is provided at a position coaxial with the pipe body 1 in the same manner as the outflow pipe 5. One end (the lower end in this example) of the conduit 6 is connected and fixed to the outflow pipe 5, and the conduit 6 communicates with the outflow pipe 5. The other end (the upper end in this example) of the conduit 6 reaches near the inflow side lid portion 2 but does not contact the inflow side lid portion 2. The conduit 1 is also made of metal such as hard steel, copper, or stainless steel. 【0014】 In such a fluid stirring device, as a member responsible for the stirring function, a plurality of stirring bodies 7 in the form of coil springs are provided in the pipe body 1. Each stirring body 7 will be described with reference to Figs. 1 to 4. Figs. 3 and 4 are perspective schematic views of the stirring body. Each agitator 7 is coil spring-shaped so that it expands and contracts (compresses and expands) in response to the pressure of the fluid flowing into the pipe 1, thereby agitating the fluid. Furthermore, although the coil spring-shaped agitator 7 is fixed at both ends, it is not otherwise secured, allowing it to vibrate like a string. In other words, the coil spring-shaped agitator 7 exerts its agitation effect by expanding, contracting, and vibrating in response to the fluid pressure. 【0015】 In this embodiment, the stirring body 7 is not a simple circumferential coil spring as shown in Patent Document 1, but rather a non-circumferential coil spring. Circumferential means a spring in which the wire extends in a 360-degree circular shape when viewed from above, while non-circumferential means that it does not have such a shape. More specifically, as shown in Figure 2, one stirring body 7 in the embodiment has a shape in plan view consisting of two partial arc-shaped portions 71 and 72 and two transverse portions 73 connecting the partial arc-shaped portions 71 and 72. A partial arc does not mean a complete 360-degree arc, but rather a portion of a complete 360-degree arc. 【0016】 The two partial arc-shaped portions 71 and 72 have different radii of curvature: one has a large radius of curvature, and the other has a small radius of curvature. Hereinafter, the partial arc-shaped portion 71 with the larger radius of curvature will be referred to as the large partial arc portion, and the partial arc-shaped portion 72 with the smaller radius of curvature will be referred to as the small partial arc portion. In this embodiment, the arc length of each partial arc portion 71 and 72 is approximately 180 degrees, or slightly shorter. The transverse portion 73 is a part that extends in a direction that crosses the inside of the pipe 1. The transverse direction is the direction from one point on the inner wall surface of the pipe 1 to another point on the inner wall surface in a plan view. It can also be described as a direction parallel to the radial direction. In this embodiment, the transverse portion is a linearly extending portion (straight portion). 【0017】 The stirring body 7 of this embodiment is formed by spirally winding a wire, which has the shape described above in plan view, around a circumferential axis. In Figure 3, the circumferential axis is shown by the dashed line A. In this context, a plan view can be defined as a view from a plane perpendicular to the circumferential axis A. Note that the pitch of the wire is not uniform in the direction of the circumferential axis A, but varies in density. That is, it is dense on the inflow side and becomes coarser towards the outflow side. In this example, the upper side is the inflow side, so it is dense on the upper side and becomes coarser towards the lower side. The density can be switched between, for example, three stages: dense pitch, medium pitch, and coarse pitch. If the medium pitch is set to 1, the dense pitch is about 0.5 to 0.8 times, and the coarse pitch is about 1.2 to 2 times. Note that it is preferable for the wire to be thinner than that wound in a 360-degree arc. This is because there are many bends and the cross-sectional area of ​​the circumference is small, so making the wire thinner makes it easier to induce expansion, contraction, and vibration. Specifically, the wire diameter (outer diameter) is preferably around 2 mm to 4 mm. 【0018】 As shown in Figures 2 and 4, two such stirring bodies 7 are provided. The two stirring bodies 7 are arranged symmetrically with respect to a center line. The center line is the line passing through the central axis of the pipe 1, as shown by the dashed line L in Figure 2. It is desirable that the two stirring bodies 7 be symmetrical with respect to the center line, but they do not necessarily need to be axially symmetrical (centrally symmetrical) with respect to the central axis of the pipe 1. 【0019】 The two agitators 7 are positioned with their transverse portions 73 close together. The spacing between the transverse portions 73 (indicated as d1 in Figure 2) is preferably 2 mm to 10 mm. If the spacing is wider than 10 mm, the effect of forming turbulence weakens, and the effectiveness of providing the transverse portions 73 decreases beyond a certain limit. If the spacing is narrower than 2 mm, the vibrating agitators 7 are more likely to come into contact with each other, hindering the operation of the agitators 7 and actually reducing the agitation effect. Similarly, the spacing between the conduit 6 and the small partial arc portion 72 (indicated as d2 in Figure 2) is preferably 0.5 mm to 4 mm. If the spacing is wider than 4 mm, the effect of forming turbulence weakens, and if the spacing is narrower than 0.5 mm, the vibrating agitators 7 are more likely to come into contact with the conduit 6, reducing the agitation effect. As shown in Figure 2, each large arc section 71 extends along the inner wall surface of the pipe 1. Each small arc section 72 surrounds the conduit 6 in an opposing manner. However, since each transverse section 73 does not take up the conduit where it faces another section, it does not surround it 360 degrees. The distance between each large arc section 71 and the inner wall surface of the pipe 1 (shown as d3 in Figure 2) is preferably 0.2 mm to 0.8 mm. If the distance is this narrow, the vibrating agitator 7 is more likely to collide with the inner wall surface of the pipe 1, but it is more important to prevent the fluid from passing straight through this section. However, if the distance is shorter than 0.2 mm, the vibration of the agitator 7 will be inhibited beyond a limit due to the collision with the inner wall surface, so it is preferable to keep it at 0.2 mm or more. 【0020】 Each of these stirring bodies 7 is fixed at both ends in the axial direction. The fixing point may be the pipe body 1 or the lids 2 and 3, but in this example it is near both ends of the pipe body 1. As shown in Figure 1, each stirring body 7 has a short beam section 74 fixed to the outermost circumferential section. As shown in Figure 2, in this example there are four beam sections 74 (at 90-degree intervals) in one circumferential section. One end of each beam section 74 is fixed to the circumferential section by welding, and the other end is fixed to the inner wall surface near the end of the pipe body 1 by welding. Since there are four beam sections 74 on both sides, one stirring body 7 is fixed at four points on each side, for a total of eight points on both sides. Preferably there are two or more fixing points by each beam section 74 on each side (at 180-degree intervals) and four or more in total on both sides, and more preferably three or more on each side (at 120-degree intervals) and six or more in total on both sides. Furthermore, the inner walls of the pipe body 1, the inner surfaces of each lid, and the surfaces of each stirring element 7 and conduit 6 are plated as needed to provide corrosion resistance. This is because the fluid may be corrosive. 【0021】 The method of use and operation of the fluid agitator according to this embodiment will be described below with reference to Figures 5 to 7. Figures 5 to 7 are schematic diagrams showing the operation of the fluid agitator according to this embodiment, with Figure 5 being a schematic front cross-sectional view, Figure 6 being a schematic plan cross-sectional view, and Figure 7 being a schematic perspective view. In the following description, an example will be given of the device being used when attached to the piping of an air conditioning system. 【0022】 For example, when installing on existing piping, the fluid flow is stopped and the fluid is temporarily recovered in a reservoir, etc., and then the piping is cut at an appropriate point. Then, the inlet connecting pipe 41 is connected to the upstream end of the cut piping, and the outlet connecting pipe 51 is connected to the downstream end. The connection points are properly sealed to prevent fluid leakage. The fluid agitator is fixed to a wall or board as appropriate. For example, brackets are provided on the outer surface of both ends of the pipe body 1 by welding, etc., and a structure is adopted in which the brackets are fixed to the wall or board by screws or welding, etc. When installing the fluid agitator during the construction of an air conditioning system, it is installed at the same time as the piping system is constructed. 【0023】 After the installation of the device is complete, the refrigerant is returned from the reservoir, etc., and the compressor, etc. is activated to restart the operation of the air conditioning system. As shown by arrow F1 in Figure 5, in the fluid agitator, fluid flows into the pipe body 1 from the inlet pipe 4. The fluid flows vigorously towards the outlet side (downward in this example), spreading circumferentially from the inlet point. At this time, the fluid flows along the inner wall surface of the pipe body 1, but since there are mostly arc-shaped portions 71 of each agitator 7 near the inner wall surface, the fluid flows turbulently due to each of the mostly arc-shaped portions 71. 【0024】 The fluid that reaches the outlet side cover 3 then reverses direction at the outlet side cover 3 and flows towards the inlet side (upward in this example). When flowing towards the inlet side, the fluid flows closer to the center of the pipe body 1, as shown by arrow F2 in Figure 5. When it returns to the position of the inlet side cover 2, the fluid reverses direction again at the inlet side cover 2 before entering the conduit 6. Guided by the conduit 6, it reaches the outlet pipe 5, and from the outlet pipe 5, it flows through the outlet side connecting pipe 51 to the downstream piping. In the fluid flow described above, as the fluid flows along the inner wall surface of the pipe 1, the fluid pushes against the majority of the arc portion 71 of each agitator 7 as it flows. As a result, each agitator 7 is compressed toward the outlet side, and then expands due to the reaction (due to the restoring force acting as a spring). In other words, each agitator 7 expands and contracts due to the pressure of the flowing fluid. 【0025】 Furthermore, when fluid is discharged from the slanted tip surface 41 of the inlet pipe 4, the fluid flows while spreading along the inner wall surface of the pipe body 1, but as shown by F1 in Figure 6, it also collides with the inner wall surface and bounces back towards the center. This bounce towards the center acts to push each agitator 7 in a direction perpendicular to its axis, causing vibration of each agitator 7. In other words, each agitator 7 performs a complex motion that involves both expansion and contraction and vibration, which promotes turbulence of the fluid and exerts a stirring function. Furthermore, in this embodiment, as shown by F3 in Figure 7, when the fluid reverses direction from the outlet side cover 3 and returns to the inlet side, it flows while colliding with the transverse portions 73 of each agitator 7. This collision increases turbulence in the flow when it returns to the inlet side, further enhancing the agitation function. 【0026】 Furthermore, when the fluid returns to the inflow side, some of it flows along the outer surface of the conduit 6, and this fluid collides with each small arc section 72, causing turbulence in these sections as well, thus exerting a stirring function. The collision of fluid in the transverse section 73 and the small arc sections 72 pushes the wires of each agitator 7 on the inside, causing each agitator 7 to expand, contract, and vibrate. As a result, in addition to the action in each large arc section 71, each agitator 7 undergoes more complex expansion, contraction, and vibration, further enhancing the stirring function. 【0027】 Thus, according to the fluid agitator of this embodiment, as the fluid reverses direction at the outlet side cover 3 and moves toward the inlet side cover 2, turbulence is created by each transverse section 73 and each small partial arc section 72, increasing the turbulence formation ratio, and as a result, the agitation function is significantly improved. Therefore, in piping to which this fluid agitator is installed, the resistance of the flow path is reduced, and energy efficiency is greatly increased. 【0028】 The effectiveness of the fluid agitator in this embodiment largely depends on each transverse section 73 and each small arc section 72. If a simple spring-shaped device with a large diameter and a 360-degree circumferential shape in plan view is used, turbulence is generated in the forward flow along the inner wall surface of the pipe 1, but in the return flow that reverses at the outlet side cover section 3 and heads towards the outlet side cover section 3, there is no obstruction on the central side and the flow simply flows along the conduit 6, so the turbulence effect is low. In this embodiment, a large turbulence effect is generated in this return flow, so the overall turbulence formation ratio is increased and the agitation function is dramatically improved. 【0029】 Furthermore, in the configuration of the above embodiment, the small arc portion 72 is not necessarily an essential element. That is, the transverse portion 73 may be provided so as to connect the ends of the majority arc portion 71. However, since the conduit 6 is present, the distance between the opposing transverse portions 73 must be greater than the outer diameter of the conduit 6, which widens the spacing between the transverse portions 73. As a result, there is a drawback that a large proportion of the fluid passes through the space between the transverse portions 73 in a laminar flow state. This problem can be solved by making the conduit 6 narrower, but if the conduit 6 is narrowed, the conductance to the outlet pipe 5 decreases, which may reduce the overall efficiency. Conversely, the small arc portion 72 is significant in that it allows the use of a conduit 6 of an appropriate diameter while ensuring that the turbulent flow effect in the transverse portion 73 is not impaired. 【0030】 In the above embodiment, it is preferable that the inlet pipe 4 is not located near the point where the transverse sections 73 face each other. This is because, at the point where the transverse sections 73 face each other, there are no circumferentially extending wires (mostly the wires of the arc section 71), so if fluid is introduced from that vicinity, the effect of pressing the arc section 71 tends to decrease, and a larger proportion of the fluid tends to proceed axially along the inner wall surface of the pipe body 1 (proceeding in a laminar flow state). In other words, it is preferable that the inlet pipe 4 be located away from the point where the transverse sections 73 are facing each other at a distance d in a plan view. This prevents a decrease in the fluid stirring effect. In the example in Figure 2, it is located at an angle exactly in the center of the mostly arc section 71. 【0031】 Next, other embodiments besides those described above will be explained. Figures 8 and 9 are schematic plan cross-sectional views showing other embodiments. First, in the above embodiment, two stirring bodies 7 were provided, but in implementing the present invention, more stirring bodies can be provided. One example of this is shown in Figure 8, where three stirring bodies 7 can be provided. Each stirring body 7 is formed in a coil spring shape, having, in a plan view, large and small partial arc sections 71 and 72 with arc lengths of approximately 120 degrees (1 / 3 arc) or slightly shorter, and a transverse section 73 connecting the large partial arc section 71 and the small partial arc section 72. Similarly, the transverse section 73 of each stirring body 7 faces the transverse section 73 of the adjacent stirring body 7. According to the embodiment in Figure 8, the transverse sections 73 extend facing each other at three locations around the central conduit 6, thereby further enhancing the turbulence effect of the transverse sections 73. 【0032】 Furthermore, although not shown in the diagram, it is also possible to provide up to four stirring bodies. In this case, each stirring body is formed in a coil spring shape, having a large and small arc section with an arc length of approximately 90 degrees (1 / 4 arc) or slightly shorter, and a transverse section connecting the large and small arc sections. Similarly, the transverse section of each stirring body faces the transverse section of the adjacent stirring body. In this example, since the transverse sections extend facing each other at four points around the conduit, the turbulence effect caused by the transverse sections is further enhanced. Increasing the number of agitators increases the number of transverse sections, which is desirable because it enhances the turbulent flow effect caused by these sections. However, it also makes the structure more complex and slightly more expensive. On the other hand, a configuration with only two agitators 7 is preferable because it does not increase the structure as much and keeps costs down. 【0033】 Furthermore, as shown in Figure 9, when implementing the present invention, instead of a portion extending in a partially circular arc shape, a portion extending linearly and then bending, 75 may be used as the portion connecting each transverse portion 73. In Figure 9, it is "く" shaped (the diagonal shape of an isosceles triangle), but it may also be "コ" shaped (the three sides of a square). Furthermore, in the above embodiment, each transverse portion 73 was a linearly extending portion (straight portion), but other shapes can also be adopted. For example, it may be a wavy-shaped portion or a zigzag-shaped portion. If a complex shape other than a straight portion is used, the turbulence effect will be further improved. However, in the case of a straight portion, there are fewer bending points, so residual stress during molding is reduced, which is preferable in terms of durability. 【0034】 Furthermore, in the configuration of the above embodiment, the fact that the tip surface of the inlet pipe 4 is angled has significance in that it allows the fluid to collide with the inner wall surface of the pipe body 1 and utilize the rebound, as described above. For this purpose, the inclination angle of the tip surface (angle with respect to the plane perpendicular to the longitudinal direction of the inlet pipe 4, shown as θ in Figure 1) is preferably around 25 to 60 degrees. If it is less than 25 degrees, the effect of utilizing the rebound becomes too small, and the vibration effect of each agitator 7 due to the rebound of the fluid cannot be expected. Also, if it exceeds 60 degrees, the flow component in the lateral direction (direction perpendicular to the axis) becomes too large, hindering the formation of fluid flow toward the outlet side cover 3, and reducing overall efficiency. For this reason, θ is preferably around 25 to 60 degrees. Furthermore, the significance obtained by configuring the tip of the inlet pipe 4 as described above can be obtained independently of the significance obtained by employing multiple agitators 7 having transverse sections 73. In other words, even when using a stirring body other than the multiple stirring bodies 7 having transverse portions 73 (for example, a stirring body with a 360-degree arc shape in plan view, as in Patent Document 1), the above significance can be obtained by setting θ to approximately 25 to 60 degrees. 【0035】 In the above description of the embodiment, an air conditioning system was used as an example of its application. However, the fluid agitator of the embodiment can be used for agitating fluids in various refrigeration and freezing equipment, and is also suitable for use in large-scale cooling equipment such as data center cooling systems. In addition, the fluid agitator of the embodiment can also be used in heat pump systems. The same applies to air conditioning systems; cooling and heating use the same principle of compressing fluids by a compressor, only the cycle is reversed. For this reason, the fluid agitator of the embodiment is suitable for use. When the fluid agitator of the embodiment is used in heating piping, the fluid is a heat transfer medium. [Explanation of Symbols] 【0036】 1. Body 2 Inlet side lid 3 Outlet side cover 4 Inflow pipe 5 Outflow pipe 6 Conduit 7 Stirring body 71 Mostly arc section 72 Small partial arc section 73 Transverse section 74 Beam section

Claims

[Claim 1] A fluid stirring device for stirring a fluid, A cylindrical tube, A pair of caps that close the openings at both ends of the tube, A conduit fixed inside the tube and two stirring bodies It is equipped with, One of the pair of lids is provided with a fluid inlet pipe, and the other lid is provided with a fluid outlet pipe. The conduit is located in the center of the tube so that its length aligns with the central axis of the tube, with one end facing the space inside the tube and the other end communicating with the fluid outlet pipe. The fluid stirring device is characterized in that the two stirring bodies are coil spring-shaped, spirally formed around an axis located off-center from the central axis of the tube, and have a mostly arc-shaped portion that extends in a partially arc shape along the inner wall surface of the tube and a transverse portion that extends in a direction traversing the inside of the tube when viewed in a plan view from a plane perpendicular to the central axis of the tube, and that the transverse portions of each are opposite each other with a line passing through the central axis of the tube and perpendicular to the central axis. [Claim 2] A fluid stirring device for stirring a fluid, A cylindrical tube, A pair of caps that close the openings at both ends of the tube, A conduit fixed inside the tube and multiple stirring bodies It is equipped with, One of the pair of lids is provided with a fluid inlet pipe, and the other lid is provided with a fluid outlet pipe. The conduit is located in the center of the tube so that its length aligns with the central axis of the tube, with one end facing the space inside the tube and the other end communicating with the fluid outlet pipe. Multiple stirring bodies are coil spring-shaped, spirally formed around an axis located off-center from the central axis of the tube, and in a plan view taken from a plane perpendicular to the central axis of the tube, they have a mostly arc-shaped portion extending along the inner wall surface of the tube and a transverse portion extending in a direction traversing the interior of the tube, with the transverse portions facing each other across a line passing through and perpendicular to the central axis of the tube. A fluid stirring device characterized in that each stirring element has a portion that connects each transverse direction portion inside each of its predominantly arc-shaped portions. [Claim 3] The fluid stirring device according to claim 2, characterized in that each agitator has a small partial arc portion that partially surrounds the conduit in a plan view taken from a plane perpendicular to the central axis of the pipe, and the portion connecting each of the transverse portions is a small partial arc portion. [Claim 4] The fluid stirring device according to claim 1, characterized in that the fluid inlet pipe is provided at a position that is not adjacent to the point where the transverse portions face each other when viewed in the circumferential direction around the central axis of the pipe body. [Claim 5] The fluid stirring device according to claim 2, characterized in that the fluid inlet pipe is provided at a position that is not adjacent to the point where the transverse portions face each other when viewed in the circumferential direction around the central axis of the pipe body. [Claim 6] The fluid stirring apparatus according to any one of claims 1 to 5, characterized in that the transverse portion is a straight portion extending parallel to the radial direction.

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