JPS6311047B2 - - Google Patents

Description

[Detailed Description of the Invention] a. Industrial Application Field The present invention is a device that has a stirring element for stirring inside a pipe, and is capable of handling a fluid containing a mixture of two or three types of gas, liquid, and granular material. This invention relates to a flow mixer that mixes while flowing in a pipe.

b. Prior Art As a device for mixing a fluid containing a mixture of two or three types of gas, liquid, and granular material, it is common to use a device in which stirring blades or the like are disposed within a container. However, in such a device, since the fluid is stirred in batches, continuous stirring processing is not possible, and the mixing efficiency is not good because the fluid tends to be mixed unevenly as the processing time passes. Particularly in the case of liquid-vapor mixture, there is a drawback that a large amount of gas is wasted. Furthermore, since the device is large, its manufacturing cost is high, and it also has drawbacks such as requiring a large installation space.

Therefore, a flow mixer has been developed to overcome these drawbacks. This flow mixer has a stirring element disposed in a pipe, and mixes the fluid by the stirring element while allowing the fluid to flow through the pipe. However, the velocity of the fluid flowing inside the pipe is not uniform at each position in the pipe cross section, and the stirring element cannot freely adjust the stirring effect at each position, so it is not possible to maintain a good mixing state over the entire cross section, and the entire flow mixer The stirring effect is not sufficient.

In addition, conventional flow mixers have a large pressure loss, so the pumping energy must be increased, and depending on the model, there are many contact points between the stirring elements and the pipe bodies, and the presence of these overlapping parts A low flow velocity portion occurs, making it easy for dust and chemical reaction products to adhere. Furthermore, conventional flow mixers are generally difficult to apply to curved pipes, are not easy to assemble or disassemble, and are relatively expensive to manufacture.

Note that, as shown in FIGS. 6 and 7, flow mixers 12 and 13 each have one or more coiled stirring elements 11 disposed in a spiral shape within a tube 10.
is publicly known (Japanese Utility Model Application Publication No. 58-91431,
53-109178).

However, since both of these flow mixers 12 and 13 have stirring elements 11 arranged in a spiral shape, there is a problem in terms of the fluid stirring effect. That is, the velocity distribution of the fluid within the tube 10 is maximum at the center of the tube 10 and becomes slower as it approaches the tube wall. In order to obtain the optimal stirring effect for the velocity distribution that changes in the radial direction, it is necessary to calculate the ratio (actual (referred to as the filling ratio in connection with Japanese Patent Publication No. 58-109178) must be varied in the radial direction of the tube 10.

However, the mixing element 11 arranged in a spiral manner
No matter how much the pitch or the like is changed, it is impossible to change the sufficiency ratio in the radial direction, and therefore, there is room for improvement in the conventional flow mixers 12 and 13 in terms of the stirring effect.

c. Purpose of the Invention The present invention was developed to effectively solve the above-mentioned problems, and its purpose is to provide a flow mixer with good mixing efficiency and low pressure loss.

d. Structure of the Invention The gist of the present invention is to provide a flow mixer that mixes two or three types of fluids consisting of gas, liquid, and powder while flowing them through a tube.
A single stirring element made of a single wire material formed into a coil shape is disposed inside the tube, and the diameter of the stirring element is continuously changed along its longitudinal direction to form a large diameter portion. A flow mixer is characterized in that a small diameter portion is formed.

e Examples Examples of the present invention will be described below based on the drawings. As shown in FIG. 1, the flow mixer 1 according to the present invention includes a pipe body 2, a stirring element 3 disposed inside the pipe body 2, and a stirring element 3 disposed inside the pipe body 2.
It is composed of a support fitting (not shown) for fixing to. The tubular body 2 may be made of various materials such as a straight pipe, a bent pipe, a flexible hose or a tube, and may be made of metal, rubber, or the like. The stirring element 3 is made by winding a wire material made of metal or resin into a coil to give it appropriate elasticity, and its shape has a radius of curvature of the stirring element 3 as shown in Fig. 3. Each pitch P is changed continuously from large to small and from small to large to form a conical shape. The axes of the stirring element 3 are normally arranged so as to coincide with the axis of the tube 2, but the axes may not be made to coincide if necessary, such as in the case of a curved tube. Note that the maximum radius R of the stirring element 3 is made slightly smaller than the inner diameter of the tube 2 so that the stirring element 3 can be smoothly inserted into the tube 2. The total number of pitches required by the stirring element 3 is determined by the use of the flow mixer 1 for stirring.

Since this type of stirring element 3 has flexibility, it can be used in any of straight pipes, curved pipes, and tubes. The end of the stirring element 3 is supported at a flange joint portion of the tube body 2 by a fixture (not shown).

Cross section A of the large diameter portion 4 of the stirring element 3 in Fig. 1
- Fig. 2 shows a projection of the small diameter portion 5 with respect to A. As is clear from the figure, the constituent material 3a of the stirring element 3 changes from one pitch of the stirring element 3 (the constituent material 3a of the stirring element 3 changes from large to small and from small to large; The material 3a of the stirring element is distributed throughout the cross section of the tube body 2, and is located between half pitches on the cross section perpendicular to the center axis of the tube body. The proportion of the constituent material 3a in the unit area at any position in the projection diagram (hereinafter referred to as the solidity ratio) is the radius of curvature of the stirring element 3 at that position and the radius of curvature of one roll having a radius of curvature close to that of the stirring element 3 at that position. It is determined by the number of constituent members 3a existing in one pitch. In other words, if the change in the radius of curvature of the stirring element 3, which changes from large to small and from small to large, is made smaller, the filling ratio in the A-A cross section of the constituent material 3a of the element 3 between one pitch becomes larger, On the contrary, if the change in the radius of curvature is increased, the filling ratio of the element constituent material 3a will be decreased. Also, if the change in the radius of curvature is small only in the vicinity of a certain radius of curvature,
The solidity ratio in the AA cross section of the component 3a with that specific radius of curvature is large. Furthermore, the stirring intensity can also be adjusted by appropriately selecting the ratio of the cross-sectional area of the constituent material 3a of the stirring element 3 to the cross-sectional area of the tube body 2. In addition, although the cross-sectional shape of the component 3a is illustrated as circular, it may be a modified shape other than circular or square.

Needless to say, the stirring elements 3 constituting one flow mixer 1 do not need to be made of one continuous material, and may be connected by welding, sleeves, or other means. Furthermore, if necessary, a plurality of stirring elements 3 having a certain number of pitches may be arranged in series. Furthermore, the increase or decrease in the radius of curvature between one pitch is not limited to monotonous changes from large to small and small to large, but for example, changes from large to small, small to medium, medium to small, and small to large. There is no harm in letting it happen.

The flow mixer 1 of the present invention has the structure as described above, and the stirring element 3 covers the entire cross section of the fluid so as to produce an optimal stirring action in each part of the entire fluid cross section as shown in FIG. Since the fluids to be mixed passing through the flow mixer 1 are forcibly turned into vortices and turbulence by the stirring element 3, they are subjected to a strong and efficient mixing and stirring action in a short period of time. The mixing effect is illustrated in FIG. In the figure, the symbol ///// indicates the mixing density, and indicates that as the fluid to be mixed progresses, it is sequentially stirred and mixed, and eventually a satisfactory mixing state is reached over the entire cross section.

Next, an embodiment in which the present invention is applied to a heat exchanger will be described based on the drawings.

Fig. 5 shows an embodiment used in a U-shaped multi-tube cylindrical heat exchanger, which includes a tube body 2 serving as a heat transfer tube, a tube plate 6, a shell 7, a heated (or cooled) fluid inlet 8, and an outlet thereof. 9, partition wall 10, heating (or cooling) fluid inlet 11,
It is composed of the outlet 12, a stirring element 3 inserted into a tube body 2 serving as a heat transfer tube, a baffle plate 14, and a support metal fitting 15.

The fluid to be heated (cooling will not be described hereinafter) flows in through the inlet 8, passes through the pipe body 2, and flows out through the outlet 9. The heating fluid flows in through the inlet 11 and flows out through the outlet 12. The tube body 2 is fixed to a tube sheet 6 by welding or a tube expansion method, and the tube sheet 6 also separates the heating fluid and the fluid to be heated. The partition wall 10 is a tube body 2 which is a heat transfer tube.
The baffle plate 14 provides a zigzag path for the heating fluid to pass through and supports the tube body 2. As shown, the stirring element 3 is inserted into the tube body 2 and supported by a support metal fitting 15 at the tube end.

In the heat exchanger of the present invention, when the fluid to be heated flows in the pipe, the stirring element 3 applies a stirring action to both the inner wall of the pipe and other parts, and the local flow velocity increases due to the vortex generated near the inner wall, and the inner wall of the pipe increases. The heat transfer coefficient increases, and the heat transfer of the heated fluid due to the stirring action also becomes rapid in the central portion, and these actions improve the heat transfer rate. The shape of the stirring element 3 is determined to be suitable for the above-mentioned functions.

According to the above heat exchanger, the following effects can be obtained.

(1) By inserting a coil-shaped stirring element into the heat transfer tube, the heat transfer rate can be improved, making it a low-cost heat exchanger with a large heat transfer effect.
Alternatively, a compact heat exchanger can be obtained.

(2) Capacity of existing tube heat exchangers can be improved with almost no modification required.

(3) It can also be applied to coil-type heat exchangers that use curved pipes as heat transfer tubes.

(4) Easy to disassemble and clean.

(5) The increase in pipe resistance is small and a great heat transfer effect can be obtained.

f. Effects of the Invention The effects of the flow mixer of the present invention are listed as follows: (1) Good mixing efficiency, large mixing effect can be obtained within a short distance flow path, and there is little mixing unevenness.

(2) There is little pressure loss because the stirring elements do not overlap, and there is little adhesion of mixed substances, especially reaction products when chemical reactions are involved, to the mixing elements, so there is little increase in pressure loss or decrease in mixing capacity due to clogging. .

(3) In addition to straight pipes, curved pipes and flexible hoses can be used as the pipe body, and the material of the pipe body may be metal, rubber, etc.
Any material such as vinyl can be used, and its structure consists of a tube body and a stirring element, and there are no restrictions on the location of the stirring element within the tube, and no special accessories are required, making the structure extremely simple. Therefore, the manufacturing cost is low, and assembly, disassembly, installation, and maintenance are extremely easy.

(4) Due to the features mentioned in the previous section, the general pipe line between devices (not only straight pipes but also curved pipes) can be used as the pipe body of the flow mixer, reducing installation space and installation costs for the mixing device. Can be omitted.

(5) By installing a stirring element inside the general fluid transport pipe, the transport pipe itself can be used as a flow mixer during the transport process.

[Brief explanation of the drawing]

1 to 5 show examples of the present invention, in which FIG. 1 is a longitudinal cross-sectional view of a flow mixer, and FIG. 2 is a cross-sectional view of a stirring element taken along line A--A in FIG. 3 is an enlarged vertical cross-sectional view of the flow mixer, FIG. 4 is an explanatory view for explaining the stirring state of the fluid, and FIG. 5 is a vertical cross-sectional view of the heat exchanger. Further, FIGS. 6 and 7 are vertical cross-sectional views of a conventional flow mixer. DESCRIPTION OF SYMBOLS 1... Flow mixer, 2... Pipe body, 3... Stirring element, 4... Large diameter part of stirring element, 5... Small diameter part of stirring element.

Claims (1)

[Claims] 1. In a flow mixer that mixes a mixture of two or three types of fluids consisting of gas, liquid, and powder or granules while flowing through a tube, the tube contains:
A single stirring element made of a single wire material formed into a coil shape is provided, and the diameter of the stirring element is continuously changed along its longitudinal direction to form a large diameter part and a small diameter part. A flow mixer that is characterized by: