JPH01316221A - Mixing head for polyurethane foam - Google Patents

Abstract

PURPOSE:To enable the mixing property of double liquids to be easily controlled to a most excellent condition without removing lines and without changing parts by equipping with a plurality of nozzles, a needle provided with slant grooves, an external adjusting means connected to the nozzles and an adjusting means for variably controlling the area of conduits from the external part. CONSTITUTION:Double liquids (liquid P, liquid R) are respectively ejected from the inlet 4a of solution under high pressure and facingly ejected from an outlet 5a, and imparted a swirl force up to the vicinity of the tip of a needle 3a through grooves 3d, and then injected in spreading into a centrifugal direction from the liquid outlet 5a, furthermore, continued to be swirled. The liquid continuing to be swirled in this manner collides with the liquid continuing to be facingly injected and swirled, and mixed with each other uniformly. In order to obtain the excellent mixing property in corresponding to the viscosity of liquid and the viscous difference of double liquids, the amount of flow rate and the like, the attaching position of an external adjusting nozzle holder 2 to a head main body 1 is adjusted through angle divisions 2a and length divisions 1a so as to obtain an appropriate collision distance A. And a predetermined discharging pressure can be obtained through adjusting an external adjusting needle 3 by the angle divisions 3c and a pointer 4b.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixing head for a foaming machine that produces polyurethane foam (F) by mixing two liquids by opposing high-pressure jets, and particularly relates to a structure for easily finding conditions for obtaining a good foam.

A conventional mixing head that mixes two liquids by opposing high-pressure jetting has a structure shown in FIG.

1 is a head main body, and 2 is a nozzle holder, which includes an inlet 2a for a stock solution and a sealing napft 2b. 5.3′
is a nozzle, which has built-in blades 3a and 3a', and is fixed to the nozzle holder 2. 4 is a backing, which plays the role of preventing leakage of the stock solution and adjusting the collision distance A between the two solutions. 5 is a discharge port for the mixed liquid. 6 is a piston that moves up and down, and has a notched groove 6a on the facing surface, and moves up and down by hydraulic pressure etc. to discharge liquid,
Switching circulation. To adjust the liquid collision distance A and discharge pressure, which affect the mixability, remove the piping (not shown) connected to the raw liquid inlet 2a and connect it to the backing 4 or nozzle 3.3. ' had to be replaced.

For this reason, handling such as spillage of the two liquids is difficult, and delicate adjustments are difficult, so that the best form may not be obtained.

The purpose of the present invention is to improve the mixing head of a polyurethane foam foaming machine, which mixes two liquids (P liquid and R liquid) by opposing high-pressure injections, without removing piping and replacing parts. The object of the present invention is to provide a mechanism that allows easy adjustment of mixability to the best condition.

The most important factor for obtaining a good polyurethane foam is the mixing property.

In order to obtain good mixing properties, the collision distance between the two liquids and the discharge pressure must be maintained at an appropriate level.

The present invention provides a mixing head that allows adjustment work to be carried out without touching the difficult-to-handle stock solution, that is, without removing the piping. That is, a mixing head is provided which is equipped with a means for measuring relevant dimensions and an external adjustment mechanism.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Reference numeral 1 denotes a head body having a length @ ia. Reference numeral 2 denotes an external adjustment nozzle holder which has a sector for discharging the stock solution nozzle 5.5' and is provided with a circumferential scale 2a. Reference numeral 5 designates an external adjustment needle, which includes a needle portion 3a, an adjustment portion 3b, and a circumference @3c. Further, it is preferable that the needle portion 34 is provided with an m portion 3d that is inclined to near the tip of the needle portion 3a, as shown in FIG. 4 is a needle cap equipped with an undiluted solution population 4α and a pointer 4b. 5.5 is a nozzle, and 5a, 5a are liquid discharge ports. 6 is a discharge port for the mixed liquid, and 7 is a piston, which has a notched groove 7a on its opposing surface, and is moved up and down by hydraulic pressure or the like to switch between discharging and circulating the liquid.

To explain the operation, when two liquids are mixed, the piston 7 moves to the second
The two liquids enter from the inlet 4a of the raw liquid at a high pressure of around 10051 G and are injected oppositely from the outlet 5a of the mixed liquid, and the counterinjected liquid is discharged from the outlet 6 of the mixed liquid. Since the inclined groove 3d is formed up to the vicinity of the tip of the needle portion 3a, the turning force is applied to the vicinity of the tip of the needle portion 3a by the groove 3d. The liquid subjected to this swirling force is transferred to the needle portion 3a.
Since the liquid is immediately ejected from the liquid ejection port 5a adjacent to the tip of the liquid, the liquid is spread in the centrifugal direction from the liquid ejection port 5a due to the large centrifugal force without reducing the swirling force, and continues to swirl. The liquid thus injected and continuing to swirl as it spreads in the centrifugal direction collides with and mixes with the liquid that is similarly injected counter-injected and spreads in the centrifugal direction and continues to swirl. This mixed liquid spreads in the centrifugal direction, so it is mixed in a wide space, and furthermore, it continues to swirl, so that it is uniformly mixed. In addition to this,
In order to obtain good mixing properties in response to changes in conditions such as the viscosity of the liquid, the viscosity difference between the two liquids, and the magnitude of the flow rate per unit time, the mounting position of the external adjustment nozzle holder 2 with respect to the head body IK should be adjusted to the angle scale 2a. and length scale 1a to obtain an appropriate collision distance. In addition, the external adjustment needle 3 is adjusted by AI using the angle scale 3C and the pointer 4b.
A predetermined discharge pressure can be obtained.

Since the optimal values of the collision distance and discharge pressure differ depending on the viscosity of the stock solution, the viscosity difference, the size of the flow cap per unit time, etc., adjustment work is often performed.

According to this embodiment, adjustment can be made without removing the piping, and the effect of finding good mixing properties in a short time is significant. It also has the advantage of being able to easily adjust for abnormal pressure increases due to layers with foreign matter.

According to the present invention, it is possible to obtain the best mixing performance without removing the piping of the mixing head or replacing parts, so there is an effect that adjustments can be made efficiently in a short time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional mixing head, FIG. 2 is a sectional view of a mixing head according to the present invention, and FIG. 3 is a sectional view of a conventional mixing head.
This is an f+ prayer map near Figure 2. Fig. 1 1...Head body, 2...Nozzle holder, 3...
- Nozzle, 4... Backing, 5... Mixed liquid discharge port, 6... Piston. Fig. 2.5 1...Head body, 2...External adjustment nozzle holder, 3...External adjustment needle, 4...Needle cap, 5...Nozzle, 6...Mixed liquid discharge port ,7...
piston. 7th Kuniaki 2nd

Claims (1)

[Claims] 1. A plurality of nozzles having a discharge port for liquid jetting, the discharge ports facing each other and provided at a predetermined distance, and a passage for the liquid to swirl and flow between the nozzle and the nozzle. a needle provided with an inclined groove to form;
A mixing head for polyurethane foam, comprising an external adjustment means connected to a nozzle for adjusting the predetermined distance from the outside, and an adjustment means for variably adjusting the area of the passage from the outside.