JP3372211B2 - Two-part mixing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-liquid mixing apparatus for mixing two liquids at a fixed ratio as used in a two-liquid coating method comprising a main liquid and a curing liquid. About. 2. Description of the Related Art In an apparatus for mixing two liquids by flowing them alternately, in order to obtain a stable mixing ratio, the supply amount is accurately controlled by a flow meter and alternately supplied to a mixing chamber of a premixer. The mixture was supplied, changed into a simultaneous parallel flow in the mixing chamber, supplied to the mixer, and mixed at a predetermined mixing ratio. [0003] However, as shown in the schematic diagram of the behavior of the fluid in the premixer in FIG. 3 without the rectifying plate, the B liquid supplied from the hole of the distribution pipe is supplied by the supply of the B liquid. The amount of liquid in the mixing chamber is discharged from the outlet by an amount, and a slight flow is generated. However, the liquid does not have a flow velocity from the inlet of the mixing chamber to the outlet at the time of supply, and stays near the hole of the distribution pipe, and the liquid A and the liquid B The liquid stratifies into the mixing chamber. Then, when the liquid A having a flow velocity in the direction of the outlet is supplied from the inlet of the mixing chamber, the liquid A and the liquid B layered in the mixing chamber are discharged from the outlet in a substantially mixed state. Is done. Therefore, in the structure of the conventional premixer, the mixing ratio of the two liquids supplied from the premixer to the mixer does not become a predetermined mixing ratio.
There has been a problem that an unacceptable level of mixing ratio fluctuation within one cycle occurs in the final mixing state. As means for solving such a problem, a flow straightening plate is provided upstream of a flow path of holes uniformly arranged on the side surface of a distribution pipe in a premixer. A stagnation portion is generated in the flow from above, and the liquid supplied from the distribution pipe does not immediately flow out due to the flow from above, and the mixing ratio of the two liquids is stabilized. An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the overall configuration of the mixing apparatus. In FIG. 1, 1 is a pump for supplying each liquid,
2 is a control device for controlling the opening and closing of a control valve based on a signal from a flow meter, 3 is a control valve for turning on and off the supply of each liquid, and 4 is a device for measuring the supply amount of each liquid. A flow meter, 5 is a premixer, and 6 is a mixer. Next, an outline of the operation will be described. The total supply amount of the two liquids in one cycle is set in advance in consideration of the measurement accuracy of the flow rate and the reduction of waste when changing the liquid. Based on the mixing ratios, the supply amounts of the respective liquids in one cycle are set in the control device 2. Next, the control valve 3 of one liquid is turned on and opened,
Liquid is supplied to the premixer. When the supply amount set in the control device 2 is reached by the measurement signal from the flow meter 4, the control valve 3 is turned off and the supply is stopped, and at the same time, the other control valve 3 is turned on and opened, and Is supplied to the premixer. Similarly, when the supply amount of the other liquid reaches the supply amount set in the control device 2 by the measurement signal of the flow meter 4, the control valve 3 is turned off, the supply is stopped, and one cycle is completed. Thereafter, the above cycle is repeated. In the mixing apparatus that operates as described above, a premixer having a sectional structure as shown in FIG. 2 is used.
In FIG. 2, 7 is a premixer body, 8 is a distribution pipe,
9 is a mixing chamber inlet, 10 is a distribution pipe inlet, 11 is a mixing chamber, 1
Reference numeral 2 denotes a supply hole from the distribution pipe, 13 denotes a straightening plate, and 14 denotes an outlet of the mixing chamber. FIG. 4 is a cross-sectional view taken along the line AA shown in FIG. As shown in FIG. 4, the current plate 13 may be arranged so as to have a uniform phase angle shift other than 90 °. The flow behavior of the fluid in the premixer as shown in FIG. 3 can be obtained by installing the above-described current plate 13 in the supply hole 12 from the distribution pipe of the premixer, upstream of the flow path of the mixing chamber. . First, when the liquid B is supplied from the distribution pipe in a state where the liquid A directly supplied to the mixing chamber is filled in the mixing chamber, when the supply is completed, the point of time when the supply of the liquid B is completed when there is a rectifying plate is provided. As shown in (2), the liquid B stays in the vicinity of the supply hole 12 from the distribution pipe, but since the liquid B is supplied, the liquid in the mixing chamber is discharged from the outlet by the supply amount of the liquid B, As the position gets closer to the outlet, the retention area of the liquid B extends longer. Next, when the liquid A is supplied, the staying liquid B is not swept away by the presence of the current plate, but is dragged by the flow of the liquid A by viscous resistance.
As the A liquid supply start time and the intermediate time elapse,
The distribution becomes longer in the flow direction, and is connected to the B liquid supplied from the supply hole 12 from the downstream distribution pipe, thereby forming a flow close to the target mixing ratio. By the above-described behavior, the fluctuation of the mixing ratio of the liquid A and the liquid B supplied from the premixer to the mixer is reduced, and the fluctuation of the mixing ratio within one cycle is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a mixing apparatus. FIG. 2 is a longitudinal sectional view of a premixer. FIG. 3 is a schematic diagram of a behavior of a fluid in the premixer. FIG. 4 is a cross sectional view of a premixer (A in FIG. 2). -Includes view from arrow A) [Description of symbols] 1: pump, 2: control device, 3: control valve, 4: flow meter, 5: premixer, 6: mixer, 7: premixer body, 8: distribution pipe , 9: mixing chamber inlet, 10: inlet of minute pipe, 11: mixing chamber, 12: supply hole from minute pipe, 13:
Current plate, 14: outlet of mixing chamber

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ identification code FI B05C 5/00 B05C 5/00 A B05D 7/24 301 B05D 7/24 301U (58) Fields surveyed (Int.Cl. ⁷ , (DB name) B05B 7/00-7/32 B01F 3/08 B01F 5/00 B01F 15/04 B05C 5/00 B05D 7/24

Claims (1)

(57) [Claims 1] The respective supply amounts so as to have a set mixing ratio are alternately supplied to the premixer so that the respective liquids are supplied to the mixer at a mixing ratio. In a two-liquid mixing apparatus in which the flow is supplied to the mixer in a uniform flow, a large-diameter mixing chamber is provided with a distribution pipe having holes evenly arranged on the side surface in the center thereof. A two-liquid mixing apparatus, characterized in that a flow straightening plate is provided upstream of a flow passage of a hole uniformly arranged on a side surface of a distribution pipe of a premixer in which kinds of materials are supplied from an inlet of a mixing chamber and a hole of a distribution pipe.