JPS596163B2 - Injector for emulsion formation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injector that creates an emulsion by injecting lubricating oil into a dispersion medium.

For example, as a lubricant supplied to rolls for hot rolling, an emulsion type lubricant in which lubricating oil is dispersed in a dispersion medium such as water is commonly used. Using such lubricants,
Since the frictional resistance between the rolling roll and the rolled material is lower, 1
0 rail wear can be suppressed. 20 degrees of rough skin is suppressed.

Many effects can be obtained, such as requiring less rolling power, reducing the number of 40-roll replacements, and improving productivity.

Known methods for forming such emulsions by stirring include the premix method and the injection method. The former method is a batch method in which predetermined amounts of lubricating oil and dispersion medium are poured into a container, forcibly stirred to create an emulsion, and the emulsion is then sent to the supply area via an oil supply device. be. However, with this method, there are problems such as not only is it difficult to maintain and manage the emulsion and cleaning of the container, but also it is not easy to change the concentration of the emulsion, and the apparatus itself becomes large. On the other hand, the latter injection method is a continuous method in which lubricating oil is directly injected into the dispersion medium passage, and an emulsion is created by stirring the two by forcibly creating turbulence within the passage. , since it can be directly fed to the location to be supplied without using a special oil supply device, it does not have the drawbacks of the former method. FIG. 1 is a schematic explanatory diagram showing a known injector used in the above-mentioned injection method. Channel 3
A Vito tube 5 for injecting lubricating oil 6 is located approximately in the center of the
is installed protrudingly. That is, the dispersion medium supplied at a constant flow rate from the direction of arrow A enters the narrowed channel 3 and the flow rate is increased, but after coming into contact with the lubricating oil 6 injected from the dispersed phase injection port 5a, the next stirring The lubricating oil enters the flow path 4 and the flow rate is rapidly reduced to bring the mixture into a turbulent flow state, thereby increasing the diffusion of the lubricating oil at once. However, lubricating oil 6 simply flows into the high-speed flow path.
The conventional method of injecting the liquid does not provide a sufficient stirring effect and does not produce a stable emulsion. Therefore, the present inventors thought that if the lubricating oil 6 was injected against the flow of the dispersion medium, the agitation state between the two would be improved, and the second
We made a prototype injector as shown in the figure and conducted experiments. However, in order to make the dispersed phase oil inlet 5a of the tube 5 face the flow direction of the dispersion medium, the amount of protrusion at the tip of the tube 5 only needs to be made so that the injection port faces the case shown in Fig. 1. Since it becomes extremely large compared to , there is a drawback that the pressure loss within the narrowed flow path 8 becomes large. Therefore, it was not possible to increase the supply flow rate of the dispersion medium so much, and it was also difficult to particularly reduce the cross-sectional area of the narrowed channel 3. Also, the injection port 5a
There was a problem in that even if the lubricating oil that came out of the agitation channel 4 subsequently reached the stirring channel 4, it did not diffuse sufficiently. Therefore, although the particle size of the lubricating oil in the emulsion obtained was smaller than before, the stability of the emulsion was low. The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide an injector capable of creating a stable emulsion by enhancing the stirring effect of the dispersion medium and lubricating oil.

In other words, the configuration of the present invention that achieves the above object is that a throttle channel is provided in the dispersion medium flow channel, a re-opening channel is provided on the rear side of the throttle channel, and a re-opening channel is provided near the frontmost position of the re-opening channel. The gist of this is that a tube is provided protruding from the top of the tank for press-injecting lubricating oil in the direction opposite to the flow of the dispersion medium.

The configuration and effects of the present invention will be specifically explained below based on the drawings which are examples. However, the following example is only one specific example, and the design may be changed in various ways in keeping with the spirit of the preceding and following. All are included within the technical scope of the present invention.

FIG. 3 is a sectional view of a main part of the injector of the present invention, in which a throttle channel 7 is provided behind the dispersion medium channel 2, and a re-opening channel 8 is provided further behind the dispersion medium channel 2. A human tube 5 is provided at the position.

Note that the lubricating oil outlet in the human tube 5 is in the direction opposite to the flow of the dispersion medium, as in FIG. Also, the cross-sectional area of the throttle channel 7 happens to be narrower than that shown in Figure 1, but this is a device to improve the emulsion forming ability, and these can be adjusted as appropriate depending on the supply amount of the dispersion medium itself. However, the present invention is not particularly limited. Now, in this example, the dispersion medium supplied at a constant flow rate is throttled to the flow path 7.
The dispersion medium is changed to an extremely high velocity by changing the velocity to pass through the throttle channel 7, and collides with the dispersed phase inlet 5a of the human tube 5, which is formed in the direction opposite to the flow of the dispersion medium, so that it flows into the dispersion medium. The lubricating oil is vigorously stirred, broken into fine particles, mixed into the dispersion medium, and a stable emulsion is formed. As described above, in the present invention, the dispersion medium is collided with the dispersion medium toward the dispersed phase inlet 5a at an extremely high flow rate, so that the quality and stability of the emulsion are extremely high. FIG. 4 is a sectional view showing an embodiment using the conventional flow path described in FIGS.
The human tube 5 itself is provided to protrude into the narrowed channel 3.

Therefore, the flow can be improved in a diffusive manner by the vane member 10 without increasing the supply rate of the dispersion medium so much, so that the ability to form an emulsion can be improved with less pressure loss. By the way, various studies were conducted on the properties of the emulsions obtained by these injectors 1, and it was found that they are significantly influenced by the flow rate of the dispersion medium fed toward the dispersed phase injection port. Therefore, for example, an injector 1 as shown in FIG. 5 is designed, and a flow path restricting member 10 that can adjust the opening diameter d, that is, change the flow velocity, is provided in the restricted flow path, and the dispersion medium is supplied at a constant flow rate ( 6.
The following experiment was conducted while feeding at a speed of 61/min).
In addition, the lubricating oil emulsion must be a more stable one [i.e. emulsion stability index (ESI)] in order to uniformly supply the oil.
) #)] is desirable, and on the other hand, in order to increase the amount of adhesion to the roll during lubrication, the particle size should be larger (i.e., the particle size distribution index and representative particle size of the lubricating oil particles constituting the emulsion) are desirable. A large one is preferable. In this experiment, the diameter D of the stirring channel, the diameter E1 of the tube, and the diameter e of the dispersed phase injection port were kept constant (specifically, D = 12 φ, E = 6 φ, e = 2
5uφ), and only the opening diameter d of the throttle channel is 4uφ, 51
1φ, 6111! Changed to φ. The properties of the obtained emulsion are as follows: 1 emulsion stability index (ESI) 2 % particle size distribution index (EDP) of lubricating oil particles constituting the emulsion
I) Three representative particle diameters j (latent [median value: 50% particle diameter of volume]) were evaluated, and the experimental results are shown in Figures 6, 7, and 8.

From these experimental results, the smaller the throttle channel opening diameter d is, the better the emulsion properties are. For example, when the throttle channel diameter d is 4m1Lφ, the emulsion stability index is extremely high, at 90 to 100 (f). In addition to high dispersion, the particle size distribution index of the emulsion constituent particles is approximately 1, and the typical particle size is approximately 20μ, providing stable lubrication while maintaining a certain particle size. I was able to get some oil.

In this way, the stability of the emulsion constituent particles increases as the particle size of the constituent particles becomes smaller, and conversely, the stability decreases as the particle size increases. In general, the adhesion rate of the emulsion constituent particles to the rolling roll indicates the amount of emulsion remaining on the roll surface out of the emulsion sprayed onto the roll, and the emulsion adhesion rate is the particle size of the emulsion constituent particles. The larger the particle size, the higher the value, and conversely, the smaller the particle size, the lower the value. Therefore, in consideration of the above experimental results, if the throttle channel diameter d is formed to be less than 4 mφ, the adhesion rate to the rolling roll will decrease as the particle size distribution index and representative particle size of the emulsion constituent particles become smaller. In addition, fresh industrial water is used as a dispersion medium, but fine impurities and limescale contained in industrial water adhere to the inside of the throttle flow path.
If the diameter d of the throttle channel is set to 4 mφ or less, clogging or the like will easily occur in the throttle channel portion. In addition, in the above experiment, when the dispersed phase inlet was oriented along the flow direction of the dispersion medium, the throttle channel opening diameter d was 4 mI! Even with φ, the emulsion stability index ESI was as low as about 70%, proving the superiority of the present invention. Since the present invention is configured as described above, 1
Emulsion stability and quality can be improved.

2. Even when an oil with poor emulsifying properties is used as the dispersed phase, a good emulsion can be provided.

Since it is a three-continuous method, it is easy to change the brand and concentration of the dispersed phase.

4. The diffusion effect of the dispersed phase is good, and there is no need to provide a stirring device.

Various effects can be obtained.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part showing a known injector, Fig. 2 is a sectional view of the main part showing an injector in the research stage, Fig. 3 is a sectional view of the main part showing the injector of the present invention, and Fig. 4 is a sectional view of the main part showing the injector of the present invention. FIG. 5 is an explanatory view of the main parts of the injector used in the experiment, and FIGS. 6 to 8 are graphs showing the experimental results. 1... Injector, 2... Dispersion medium channel, 5... Human tube, 7... Throttle channel, 8... Re-opening channel, 10... channel restricting member.

Claims (1)

[Claims] 1. An injector that creates an emulsion by causing lubricating oil to flow into a dispersion medium flow path, wherein a throttle flow path is provided in the dispersion medium flow path, and the end of the re-open flow path formed on the rear side of the throttle flow path is provided. An injector for forming an emulsion, comprising a pitot tube protruding near a front position and having a lubricating oil inlet for pressurizing lubricating oil in a direction opposite to the flow of the dispersion medium.