KR20010084127A - High efficiency·high press injection head bundle - Google Patents

Abstract

PURPOSE: A mixing head of high efficiency and high pressure by dual angle injection is provided to manufacture polyurethane foam with high quality by improving the mixing efficiency in a mixing chamber by swirl and turbulent flow due to strong impingement force at horizontal and vertical dual-inclination angle of an injection nozzle. CONSTITUTION: A mixing head of high efficiency and high pressure by dual angle injection includes injection nozzles(4) for injecting isocyanate and polyol in a mixing head, wherein the injection nozzles are formed with a dual inclination angle in horizontal and vertical directions, so that polyol and isocyanate injected from the nozzles by a high pressure strongly impinge in a mixing chamber primarily and against an inner wall of the mixing chamber secondarily, forming first and second swirls and turbulent flow to be mixed in the mixing chamber optimally.

Description

High-efficiency, high-pressure mixing head bundle by two-angle spraying method {HIGH EFFICIENCY, HIGH PRESS INJECTION HEAD BUNDLE}

The present invention relates to a mixing head bundle of a polyurethane foaming machine, and to a high pressure spray of polyol and isocyanate, homogeneously mixed by vortex and turbulence in a mixing chamber, and then passing through a throttle. (Outlet Pipe) is a laminar flow to inject a mixture into a mold to produce high quality polyurethane foam.

Polyurethane foam products are classified into low pressure foaming method and high pressure foaming method. Low pressure foaming method supplies raw materials to the mixing chamber at low pressure through a nozzle, rotates the impeller at high speed, and then molds the mold. This method is gradually reduced and replaced by high pressure foaming machine due to economic and environmental factors such as cleaning, loss of raw materials, poor working environment, and poor productivity. On the other hand, the high pressure foaming method is a method of injecting the raw material at a high pressure through the nozzle to be mixed by the impact force (Impingement Force) and injected into the mold. The composition of high pressure foaming machine is composed of raw material tank and pump, mixing head bundle and driving hydraulic system, and electric and electronic control device. Especially, mixing head bundle mixes and injects raw materials to improve the quality of foam products. It's the key to deciding.

Conventionally, the mixing efficiency is decreased by horizontal or vertical unidirectional spraying method, or a separate swirl chamber or an additional device is provided in addition to the mixing chamber to improve the mixing efficiency and laminar flow at the outlet. Difficulties in maintenance and repair due to the complexity of the structure, expensive equipment, and reduced lifespan.

Accordingly, an object of the present invention for solving the problems as described above is to provide a high-efficiency, high-pressure mixing head bundle by a double angle injection method that can always produce a high-quality polyurethane foam.

In order to achieve the above object, in order to improve the mixing efficiency of the polyol and isocyanate at high pressure of the mixing head 1, the injection nozzle 4 of the polyol and the isocyanate was formed at a double inclination angle in the vertical and horizontal directions. .

1 is a longitudinal cross-sectional view of a mixing head bundle of the present invention.

2 is a raw material flow diagram in FIG.

3 is a horizontal sectional view and a raw material flow diagram of the line A-A of FIG.

4 is a vertical cross-sectional view of the line B-B in FIG.

5 is a raw material flow diagram in the vertical and horizontal cross-sectional view of the conventional product.

<Description of the symbols for the main parts of the drawings>

1: body 2: discharge tube

3: mixing chamber piston 4: spray nozzle

5: mixing chamber 6: cleaning piston

7: Throttle Control

8: cylinder cover 9: spacer tube

10: Release lubricant supply flow path 11: Release lubricant supply room

12-1,12-2,12-3: low friction elastomer scraper

A: Nozzle position B: Primary collision of raw material

C: secondary collision of raw materials

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described below are terms defined in consideration of functions in the present invention, and may be changed according to the intention or custom of a user or a designer, and the definitions should be made based on the contents throughout the present specification.

According to the present invention, when the hydraulic tank and the polyol and isocyanate connecting pipes are connected to the mixing head 1 (not shown), when the pump of the hydraulic tank is operated, the cleaning piston 6 is reversed by the hydraulic oil and then mixed. The chamber piston (3) is reversed to form the mixing chamber (5) by the mixing head body (1) and the mixing chamber piston (3), and at the same time the injection nozzle (4) of the double angle is opened, the polyol and isocyanate are high pressure ( 120 to 200 bar).

High pressure sprayed polyols and isocyanates have a strong primary impact in the mixing chamber 5 which in turn causes secondary collisions on the wall of the mixing chamber, forming a primary vortex which is very confused by the collision energy. Secondary vortex formation and turbulent flow are performed while passing through the nozzle hole position, and the best mixing in the mixing chamber 5 is achieved by the narrowing resistance formed by the cleaning piston 6, and the mixed mixture thus becomes Passing through the discharge pipe 2 and passing through) becomes natural laminar flow and injected into the mold. When the required amount is injected into the mold, the mixing chamber piston 3 is advanced and the raw material is circulated to the tank so that the cleaning piston 6 is advanced to cleanly inject the mixing residue inside the mixing head into the mold.

In the present invention, in order to improve the mixing efficiency during high pressure injection of the polyol and isocyanate in the mixing head 1, the injection nozzle 4 of the polyol and isocyanate is formed at a double inclination angle in the vertical and horizontal directions. As a result, the polyol and isocyanate that are injected at a high pressure make vortices and turbulence very smooth by strong first and second stage collisions, and the entire mixing chamber 5 becomes the vortex and turbulent mixing space, resulting in the best homogeneous mixing. It is designed to improve the quality of polyurethane foam. In addition, the throttle adjusting device 7 is attached to the cylinder cover 8 to form a narrow flow (d) by the cleaning piston (6), and vortex and turbulent flow in the mixing chamber (5) due to the resistance caused by the narrowed flow (d). The mixture which became active and passed through the narrow flow (d) was designed to have a laminar flow which is smoother in the discharge pipe (2).

Also, in order to prevent the cleaning piston 6 and the mixing chamber piston 3 from sticking to the body 1, a flow path 10 for supplying release lubricant (DOP, TOTM, etc.) is formed in this area. Low friction elastic scrapers 12-1, 12-2, and 12-3 for preventing the outflow of the mixture, the lubricating oil, and the like into the micro gaps were provided.

As described above, the present invention improves the mixing efficiency in the mixing chamber 5 due to the vortex and turbulence caused by the strong collision force due to the double inclination angle of the horizontal and vertical of the injection nozzle when the polyol and isocyanate in the mixing head bundle are injected under high pressure. In addition, the throttle control device 7 of the cleaning piston 6 improves the mixing efficiency in the mixing chamber, and smooth laminar flow in the discharge pipe 2 can be used to produce high-quality polyurethane foam.

Release lubricant (DOP, TOTM, etc.) filled in the spacer tube (9) passes the flow path (10) by its own weight to form a release lubricant film on the surface of the cleaning piston (6) and the mixing chamber piston (3) of the mixture of the release lubricant film In order to prevent seizure as much as possible, the life of the product is extended, and the low friction elastomer scraper 12-1, 2, 3 performs sealing and bearing at the same time to maintain a clean working environment and prevent the loss of raw materials. Can be.

Claims (3)

In a polyurethane foamer consisting of raw material tanks and pumps, mixing head bundles and driving hydraulics, and electric and electronic controls, High-efficiency, high-pressure mixing head bundle by the double-angle spray method, characterized in that the injection nozzle 4 of the polyol and isocyanate in the mixing head 1 is formed at a double inclination angle in the double vertical and horizontal directions. The method of claim 1, Low friction elastomeric scrapers (12-1, 12-2, 12-3) for installing a lubricating oil supply structure on the mixing chamber piston (3) and the cleaning piston (6) of the mixing head to suppress the outflow of the mixed residue. High efficiency and high pressure mixing head bundle by double angle spraying method The method of claim 1, High efficiency and high pressure mixing head bundle by the double angle spray method, characterized in that the throttle adjusting device 7 is installed in the cylinder cover 8 of the mixing head to change the cross-sectional area of the convection flow path.