JPH01210022A - Reciprocating movement method and device for mixing plate in short tube - Google Patents

Abstract

PURPOSE:To efficiently carry out mixing with a simple mounting structure by alternately reciprocally sliding a mixing plate integrated with a bar-shaped permanent magnet sliding forward and backward along a coaxial line in a short tube by means of changing magnetic poles of an electric magnet mounted on a short tube outer section. CONSTITUTION:A bar-shaped permanent magnet 2 reciprocatingly sliding on the axial line of a short tube 1 and of integral structure with a mixing plate 4 is drawn in one direction by magnetic attraction and repulsion generated by solenoid magnets 7A and 7A mounted on the outer side of said short tube 1 and hits stoppers 8A and 8B. The sliding direction of the bar-shaped permanent magnet 2 is reversed by switching over the direct current direction to the solenoid magnets 7A and 7B through pressure sensors 9A and 9B mounted on said stoppers and subsequently the direction is changed by hitting the following stoppers 8A and 8B. Such actions are repeated to reciprocatingly move the mixture plate 4 integrated with the bar-shaped permanent magnet 2 and mix liquid L.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus for mixing liquids by reciprocating a mixing plate provided in a short pipe on a liquid transfer pipe.

[Prior Art] The so-called static mixing method, in which liquids are mixed by providing a resistance plate against the flow of liquid in a short pipe of a liquid transfer pipe, is well known, and an example thereof is shown in Fig. 14. These methods are very simple and have the great advantage of being able to perform mixing even in the middle of the transfer pipe, and are used for mixing some types of liquids, but in terms of mixing efficiency, they are less effective than dynamic mixing methods. The reality is that it is very low and not widely used.

Originally, static mixing methods differed from dynamic mixing methods, such as rotating stirring excreta in a tank, as mentioned above, there were no mechanically moving parts, and therefore the structure was simple and the equipment was simple. It had the great advantages of low cost and easy maintenance. However, in the same law, the energy required for mixing operation is the 14th
As shown in the figure, it utilizes the kinetic energy of the flow of liquids being mixed, and mixes by providing resistance to the flow, that is, by disturbing the laminar flow and making it turbulent. be. Since the resistance force that causes turbulence is approximately proportional to the square of the flow velocity, it follows that the mixing efficiency also depends exclusively on the flow velocity. Therefore, when the flow rate fluctuates, the mixing efficiency also fluctuates, and there is a fatal problem that the mixing efficiency becomes almost ineffective especially when the flow rate is low. This was a major drawback of conventional static mixing methods.

[Disadvantages to be Solved] As mentioned above, variation in mixing efficiency due to the flow rate of liquid in the pipe in the static mixing method is a major problem in the method. At the same time as solving this problem, the advantage of the static mixing method is that it can be easily installed in the middle of the piping, and the advantage of the dynamic mixing method is that it performs dynamic temperature mixing, but it does not require power transmission from outside the pipe. The motive of the invention was to realize a third mixing device without having to make any through holes in the tube wall for this purpose.

[Means for Solving the Problems] The gist of the present invention is to provide a mixing plate integrated with a rod-shaped permanent magnet that slides back and forth along a coaxial line inside a short pipe on a liquid transfer pipe. This is a method and apparatus for causing an electromagnet installed outside the tube to alternately slide back and forth by switching the direction of current, that is, changing the magnetic pole, thereby mixing the liquid flowing inside the tube.

First, the above method will be explained with reference to the drawings. First, please refer to Fig. 1, there is a rod-shaped permanent magnet (2) that slides back and forth on the axis of the short tube (1) and is integrated with the mixing plate (4).
, a solenoid magnet (7A
, 7B) is pulled in one direction by magnetic attraction and repulsion, hits a stopper (8A or 8B), and the pressure-sensitive sensor (9A or 913
) to switch the direction of the direct current to the solenoid magnet, thereby reversing the sliding direction of the rod-shaped permanent magnet (2), and then striking the next stopper to change the direction, such that By repeating the same operation, the mixing plate (4) integrated with the rod-shaped permanent magnet (2) is reciprocated, thereby causing the liquid (L) to flow into the short tube (1).
This is a method in which the water flows out from the opposite side while mixing.

Next, the mixing effect due to the reciprocating movement of the mixing plate will be explained. As for the mixing board, we will take a disc type, which is the most basic shape. Refer to Figure 2. The mixing plate or disk (4) attached to the outer circumference of the rod-shaped permanent magnet (2) on the axis of the short tube (1) must have its base near the root. A gap (C2) is provided, and a necessary gap (C1) is also provided between the tube and the inner wall surface of the short tube (1).

Next, please refer to Figure 3, the short pipe (1
) The liquid (L) mixed in the liquid flows in (F), and the mixing plate (4) moves against the flow direction (F) of the liquid (D).
When it slides, the flow (F) hits the mixing plate (4) and is divided into two directions (Fl, F2): inside and outside. The outward flow (F□) is caused by the gap (C1) on the outer edge of the mixing plate (4).
(F3), and the liquid widely diffuses into a tube shape along the outer periphery. Also, the inward flow (F2) is caused by the mixing plate (
4) flows into the root gap (C2) (F,), and since the gap is relatively small, the liquid is concentrated.

Then, it flows into the next chamber (R2) and becomes a vortex (F5). Here the liquids are mixed. Then, they hit the next mixing plate again, and again in two directions (Fl, Ft)
As before, the gap at the outer edge (C1) and the gap at the outer edge flow into the gap at the root (C2).
1, F,), it diffuses, aggregates, becomes a vortex, and is remixed. These operations are performed the same number as the number of mixing plates.

Next, a case where the mixing plate (4) moves in the opposite direction (D2) to that described above will be described. Generally, the speed of D2 is greater than the speed of F. Therefore, the direction of flowing into the gap (C,, C,) of the mixing plate (4) is completely opposite to that described above, and the mixing action is performed. If the velocity of D2 is less than the velocity of F, mixing occurs with the same flow behavior as at Dl described above.

When the speeds of D2 and F are the same, mixing occurs in a different behavior than that described above, but since the probability of this is actually extremely low, its explanation will be omitted.

In this manner, the liquid moves through the tube while being effectively mixed by the repeated reciprocating motion of the mixing plate.

Next, the structure of the apparatus of the present invention based on the above method will be explained. Refer to FIG. 4. On the axis of the short tube (11), a rod-shaped permanent magnet (12) is attached to a sleeve (13) of the same length.
9, and on the outer periphery of the sleeve there are a plurality of mixed @
(14) is welded, and the sleeve (13) is supported by two sliding bearings (15A, 15B) at an interval equal to the length of the sleeve (13) minus its stroke (S). Moreover, stoppers (13) for restricting the sliding of the sleeve (13) are placed outwardly on both sides of the two sliding bearings (15A, 15B) at intervals of approximately the above-mentioned stroke.
18A, 18B) are provided, and pressure sensitive sensors (19A) are provided on their inner surfaces.

19B) is attached. The stopper and the sliding bearing (15A, z5n) have a through hole (20A, z5n) in the axial direction.
.

20B and 16A, 16B), these stoppers (18A, 18B) and the sliding bearings (15A, 15
Solenoids (17A, 17B) are installed on the outside of the short pipe (11), which approximately corresponds to the section with B).

These solenoids are the pressure sensitive sensors (19A, 19B)
It is also electrically connected to a DC direction changeover switch (22).

[Function] Also refer to Figure 4. First, as seen in the figure, the position of the rod-shaped permanent magnet (12) is such that its N pole contacts the stopper (18A) on the inflow side of liquid "L". Suppose we did. Due to the contact pressure, the pressure sensor (19A) emits a signal, which is received by the DC direction changeover switch (22), which switches the direction of the power supply DC. ) and the downstream side (hereinafter referred to as B side) the magnetic poles of the solenoids (17A, 17B) are opposite.

In other words, the A side solenoid (17A) has the upstream side connected to Na,
The downstream side is Sal, and also the B side solenoid (17
The upstream side of B) becomes sb□, and the downstream side becomes Nb.Then, the N pole of the rod-shaped permanent magnet (12) repels the above Na Yu, is attracted by Sal, and moves downstream, and the rod-shaped permanent magnet (12) ) is repelled by the above Sb1, and is attracted by Nb, which also moves downstream.In this way, the four forces act simultaneously, and the bar-shaped permanent magnet (12) moves downstream. Hits the side stopper (18B),
Then, the pressure sensor (19B) on that surface sends a message,
The DC direction changeover switch (22) is actuated to reverse the DC direction. Then, the above two solenoids (17A, 17
B) also has those magnetic poles on the A side from the above N a □ to S
a, from Sal to Na2, and on the B side from sb□ to Nb, from Nb to Sb2. Then, the N pole of the rod-shaped permanent magnet (12) is attracted to Sa2 and becomes Na.

and moves upstream, and its S pole is the above Nb
The rod-shaped permanent magnet (12) is attracted by Sb2 and repulsed by Sb2, which also moves upstream. Four forces act simultaneously, and the rod-shaped permanent magnet (12) moves upstream. And also the upstream stopper (18A)
, and repeats the same operation as above and moves downstream again. In this way, the rod-shaped permanent magnet (12) repeats the movement operation alternately in the upstream direction and in the downstream direction.

In the above explanation, the bar-shaped permanent magnet was moved back and forth via a pressure-sensitive sensor mounted on the stopper, but instead of using a pressure-sensitive sensor, a pulse controller ( 25) can be used to generate a certain required cycle signal, thereby causing the bar-shaped permanent magnet to reciprocate.

As mentioned above, since the mixing plate (14) is integrated with the bar-shaped permanent magnet (12) via the sleeve (13), the mixing plate (
14) will also repeat the reciprocating motion. Thereby, the disc-shaped mixing plate (14) mixes the liquid flowing in the Vi pipe (11), as explained in the above section of the method of the present invention.

〔Example〕

Part 1. In the above explanation, solenoids were installed on both sides of the outside of the short tube in order to reciprocate the rod-shaped permanent magnet, but in this example, as shown in FIG. 7, instead of the solenoids, U-shaped solenoid magnets (37A, 37B) + 7)N, S”t are placed at positions corresponding to both magnetic poles.
[M is also (7).

- The magnetic poles at both ends of the U-shaped solenoid magnets must be provided so as to face the magnetic poles of the bar-shaped permanent magnet. It goes without saying that if there is a plurality of U-shaped solenoid magnets, the magnetic force will be greater. One U-shaped solenoid magnet (
47A, 47B) can also be placed.

As mentioned above, the larger the number, the better. Since these operations are the same as those described above, explanations will be omitted.

Part 2. Refer to Fig. 9. The mixing plate (44) in this example has resistance to the flow direction.The mixing plate (44) in this example is made by making the aforementioned mixing plate shaped like a circular plate and attaching it with the top facing upstream. is smaller than the disc-shaped one, and larger for backflow.

Therefore, when the mixing plate (44) is reciprocated, the same resistance, that is, the same mixing efficiency can be obtained in both reciprocations by setting the flow velocity and the inclination angle of the campshade.

In addition, when the viscosity is relatively high, a notch (45) may be provided on the outer periphery of the mixing plate (44) as shown in FIG.

Part 3. Refer to FIGS. 11 and 12, when the viscosity of the liquid is relatively high, and when it is desired to reduce the resistance in both directions, oval mixing plates (54) are provided so as to be tilted alternately.

Part 4. Refer to Figure 13, the front and back of the rectangular plate is 180
Static mixers of the type that are twisted by 90 degrees and connected in series in a straight line are well known.

This method divides the liquid flowing inside the pipe into two, subdivides it the same number of times as the number of twisting plates, and mixes it.

In this method, mixing is performed by fine division within the same cross section, but mixing in the front and back of the flow, that is, in the longitudinal direction, is insufficient.

By giving this back and forth reciprocating motion using the method of the present invention, it is possible to perform mixing before and after the flow.
, 65, . . ), one bar-shaped permanent magnet (67A, 67B) is attached coaxially to the front end and the rear end of the magnets.

[Effects] According to the method and device of the present invention, the device can be installed in a liquid transfer pipe like a conventional static mixing device, and can obtain sufficient mixing effects similar to a conventional dynamic mixing device. Moreover, there is no seal part, which saves the effort of maintenance and management, and greatly contributes to reducing costs.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the method of the present invention Fig. 2 is the same as above “A”
- "A" sectional view Figure 3 is an explanatory diagram of the function of the mixing plate according to the present invention. Figure 4 is a side sectional view of the structure of the device according to the present invention.
Figure 5 is a cross-sectional view taken along lines "B" and "B" as above. Figure 6 is a cross section taken along lines "C" and "Cn" as shown above. Figure 7 is a side sectional view of embodiment 1 of the present invention. Figure 9 is a side cross-sectional view of Example 2.
Figure 0 is an "E"-"E" sectional view of the same figure as above. Figure 11 is Example 3. FIG. 12 is a plan view of the same mixing plate as above. FIG. 13 is a side sectional view of the fourth embodiment. Fig. 14 is a side sectional view of an example of a conventional static mixing device. Explanation of main symbols 1.11... Short tube 2, 12... Bar-shaped permanent magnet 4.14 ,44,54,64.65...
...Mixing board 5A, 5B. 15A, 15B...Sliding bearing 7A, 7B
, 17A. 17B...Solenoid 8A, 8B, 18A
, 18B...stopper 9A, 9B, 19A
, 19B... Pressure sensitive sensor 10, 22...
...DC direction changeover switch CI, C, ...Gap "F, F, F2.F,,F,,F,,FGF. ...Flow of mixed liquid Commissioner of the Patent Office Kunio Ogawa 1. Indication of the incident 1988 Patent Application No. 36630 2. Title of the invention
and its relationship with MFtt3 and the case of the person making the amendment Patent applicant

Claims (1)

[Claims] 1. A mixing plate that is integrated with a rod-shaped permanent magnet that slides back and forth along the axis of a short tube made of a non-magnetic material on a liquid transfer pipe is connected to both magnetic poles of the rod-shaped permanent magnet. A solenoid is provided on the outside of the short tube corresponding to the stroke portion of the magnet, and the magnetic poles of the solenoid are alternately changed by alternately switching the direct current direction to the solenoid, thereby forming an integral structure with the bar-shaped permanent magnet. A method for reciprocating a mixing plate in a short tube, characterized in that the mixing plate is reciprocated within the short tube to mix liquid flowing in the tube. 2. a. A flanged short tube made of a non-magnetic material; b. A rod-shaped permanent magnet of a required length sliding along the axis of the short tube with a required stroke; c. The rod-shaped permanent magnet The magnet is covered with a sleeve of the same length,
a plurality of mixing plates are fixed on the sleeve; d. two sliding slides for the rod-shaped permanent magnets are spaced apart by a length equal to the length of the rod-shaped permanent magnet minus the stroke length; providing a bearing; e. providing a stopper for each of the two sliding bearings at an interval of approximately the above stroke; and f) the two stoppers and a stopper close to them. A solenoid is provided on the outside of each of the short tubes corresponding to the area between the two stoppers, g. A pressure sensor is provided on the inner surface of each of the two stoppers, and h. , on the two stoppers and the sliding bearings, through-holes are provided for liquid passage passing through both sides; i. the pressure-sensitive sensor and the solenoid are each electrically connected to a DC direction changeover switch; A device for reciprocating a mixing plate in a short tube, characterized by: 3. The device for reciprocating the mixing plate in the short tube according to claim 2, characterized in that the pressure sensor is removed and a pulse controller is electrically connected to the solenoid in its place. 4. The device for reciprocating a mixing plate in a short tube according to claim 2, wherein the solenoid is a U-shaped solenoid magnet. 5. The mixing plate is disc-shaped, and a gap hole is provided at the connection part with the sleeve on the inside thereof, and the outer diameter thereof is smaller than the inner diameter of the short tube to provide the necessary gap. An apparatus for reciprocating a mixing plate in a short tube according to claim 2. 6. The mixing plate is in the shape of a canopy, and there is a gap hole at the connection part with the sleeve on the inside, and its outer diameter is smaller than the inner diameter of the short pipe to provide the necessary gap. An apparatus for reciprocating a mixing plate in a short tube according to claim 2. 7. The mixing plates have an elliptical shape, and are arranged so as to be tilted alternately with respect to the axis, and have a gap hole in the inner side of the sleeve and its connection part, and the outer diameter of the mixing plate is the same as the inner diameter of the short tube. A device for reciprocating a mixing plate in a short pipe according to claim 2, wherein the necessary gap is provided smaller than the above. 8. The mixing plate consists of a plurality of rectangular plates twisted alternately 180 degrees connected in series on the same axis, and one bar-shaped permanent magnet is installed on the same axis at each of the front and rear ends of the mixing plate. A device for reciprocating a mixing plate in a short tube according to claim 2.