JPS62132634A - Vacuum cooling apparatus of foamed styrol forming machine - Google Patents

Abstract

PURPOSE:To increase a rate of vacuum rise in a die steam chamber and obtain a high vacuum rate by connecting a drain pipe with an airtight water storage tank, attaching in a body a condenser to the storage tank and connecting a drain pipe with the water storage tank. CONSTITUTION:A drain pipe 2 with a drain valve 3 connecting with a die steam chamber 1 is connected with an airtight water storage tank 4. A condenser 5 with a nozzle 6 for spraying cooled water is connected with the upper part of the airtight water storage tank 4. A vacuum pipe 7 to which a vacuum pump 8 is installed is connected with the condenser 5 and a drain pipe 9 is connected with the water storage tank. In this way, the structure can be simplified by using the drain pipe 2 for a vacuum suction pipe and by integrally attaching the condenser 5 to the storage tank 4. Steam evaporated again by pressure reduction in the condenser 5 can be surely and efficiently excluded before the gas is sucked by the vacuum pump 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a vacuum cooling device for a polystyrene foam molding machine that combines drain discharge from a mold steam chamber and cooling of the steam chamber.

(Prior Art) Conventionally, a foamed polystyrene molding machine equipped with a vacuum device, as shown in FIG. Vacuum piping equipped with a vacuum pump tel with dl (f
After the molded product is heated with steam, the drain valve fb) is opened to drain the moisture in the steam chamber fat, and then the mold steam chamber +8) +8) is vacuum cooled. This is done either directly by operating the pump (e), or by condensing the water vapor generated in the mold steam chamber (a) using an indirect condenser installed in the vacuum piping (fl).

(Problems to be Solved by the Invention) However, according to such a configuration, since the drain piping (C1 and the vacuum piping) are arranged separately,
Not only does the entire device become more complex, but indirect capacitors (
Even if GL is used, the efficiency of condensing the steam generated in the mold steam chamber (AL) is extremely low, and in addition, it is difficult to secure a sufficient cooling area. Another problem is that it takes time to reach a predetermined degree of vacuum and the degree of vacuum is also low.

The present invention was made in view of these problems, and
The present invention provides a vacuum cooling device for a polystyrene foam molding machine that can improve the rate of increase in the degree of vacuum in a mold vapor chamber and obtain a high degree of vacuum with a simple structure.

(Means for Solving the Problems) As shown in FIG. The piping (2) is connected to the airtight water storage tank (4), and the airtight water storage tank (4) is connected to the airtight water storage tank (4).
) is communicated with a condenser part (5) having a cooling water spray nozzle (6), and a vacuum pipe (7) equipped with a vacuum pump (8) is connected to this condenser (5) part;
Furthermore, it is characterized in that a drain pipe (9) is connected to the water storage tank (4).

(Function) After the steam heating process of the molded product in the mold, the drain valve (3) is opened and the water is passed through the drain pipe (2) to the water storage tank (4).
A drain is sent into the water storage tank (4) and the water is discharged through the drain pipe (9).

Afterwards, with the drain valve (3) open, the vacuum pump (8) is operated and cooling water is sprayed from the spray nozzle (6), causing the drain pipe (2) to be sprayed by the vacuum suction force.
Through this, the pressure inside the mold steam chamber (11) is reduced, residual water adhering to the chamber and the molded product evaporates, and the mold surface and molded product are cooled by the heat of vaporization at that time.

The water vapor generated at that time is introduced into the water storage tank (4) through the drain pipe (2), is condensed by cooling water from the spray nozzle (6), and the condensed water is stored in the water storage tank (4). The gas from which moisture has been removed is transferred to vacuum piping (
7) It is discharged to the side.

(Example) To explain the example of the present invention with reference to the drawings, (1) (1)
) is the steam chamber of male and female molds (A) (A), and the drain pipe (21 (2+) is equipped with a drain valve (3) at its lower end).
Furthermore, these drain pipes (21 (21) are connected to an appropriate position at the upper end of the water storage tank (4) which is configured to be airtight.

(5) is a condenser unit that is integrated with the upper end of the water storage tank (4) with its lower end opening communicating with the upper end of the water storage tank (4), and a cooling water spray nozzle (6) is installed on the upper wall of the water storage tank (4) toward the lower part of the condenser unit. is arranged so that cooling water can be supplied from the outside to the nozzle (6) through a cooling water pipe (11) having a valve (10).

(7) is a vacuum pipe connected and communicating with the upper end of the condenser section (5), and a vacuum valve (12) and a vacuum pump (8) are arranged in this order.

(9) is a drain pipe connected and communicating with the lower end of the water storage tank (4), and is provided with a drain valve (13).

A cooling water supply pipe (14) and an air pipe (15) are connected to the mold steam chamber (11fi+).
4) has a number of nozzles (16) introduced into the steam chamber +11 and directed toward the molded product.

With this configuration, the Styrofoam in the mold cavity is heated and foamed with steam to form the molded product (B), and then cooling water is sprayed into the steam chamber (1) to form the molded product (B).
and a steam chamber (to cool 11).

The cooling water that remains in the steam room (1) is removed from the drain valve (3).
By opening the drain pipe (2), the water is introduced into the water storage tank (4), and by opening the drain valve (13), the water is discharged to the outside through the drain pipe (9).

Next, after closing the drain valve (13), the vacuum valve (12) is closed.
) and the cooling water valve (12) and the vacuum pump (
8), the vacuum suction force of the pump (8) reduces the pressure inside the mold steam chamber (11 (11) from the water storage tank (4) having the condenser part (5) through the drain pipe (2). This depressurization action occurs rapidly as shown by the solid line in Figure 3, and the degree of vacuum is 600 mmHg.
It can be raised up close.

When the inside of the steam chamber (1) starts vacuum cooling, the internal temperature is 80 to 90°C, but when the pressure is reduced by the vacuum pump (8), it adheres to the inside of the steam chamber +11 and the molded product (B). The remaining water evaporates, and the heat of vaporization directly cools the mold surface and molded product.

The mixed gas of water vapor and air thus generated in the mold steam chamber (1) passes through the drain pipe (2) to the water storage tank (
4) While passing through the condenser part (5), the mixed gas comes into contact with the cooling water spouted from the spray nozzle (6) and the water vapor is condensed, and the condensed water is transferred to the water storage tank (4). While dripping, the air from which water vapor has been removed is passed through vacuum piping (7
) is exhausted to the outside.

In this way, water vapor is removed before the gas enters the vacuum piping (7), so the same effect as increasing the exhaust capacity of the vacuum pump (8) occurs, and therefore the mold vapor chamber (
The degree of vacuum inside the vacuum pump (8) can be rapidly increased, and the temperature of the gas sucked into the vacuum pump (8) decreases, preventing the temperature of the vacuum pump (8) from rising. The degree of vacuum can be increased compared to the case where the capacitor section (5) is not provided.

The cooling water spouted from the spray nozzle (6) is sent to the water storage tank (
4), and is discharged by opening the drain valve (13) after vacuum cooling.

In the above embodiment, the capacitor part (5) is disposed above the water storage tank (4), and the two are connected and communicated with each other, but as shown in FIG. The capacitor portion (5) may be integrally formed with the water storage tank (4).

(Effects of the Invention) As described above, according to the vacuum cooling device for the foam molding machine of the present invention, the drain pipe having the drain valve connected to the mold steam chamber is communicated with the airtight water storage tank. A condenser section with a cooling water spray nozzle is communicated with the condenser section, and a vacuum pipe equipped with a vacuum pump is connected to this condenser section.Furthermore, the drain pipe is connected to the water storage tank, so the drain pipe can be used as a vacuum suction pipe. Not only can the structure be simplified by integrating the condenser part into the water storage tank, but also it is possible to re-evaporate the gas by reducing the pressure inside the mold in the condenser part before it is sucked into the vacuum pump. Water vapor can be removed reliably and efficiently, and the degree of vacuum in the mold steam chamber can be increased to a high level in a short time.

[Brief explanation of drawings]

FIG. 1 is a simplified overall configuration diagram showing an embodiment of the present invention, and FIG.
The figure is a diagram showing the operating order of each valve, etc., Figure 3 is a comparison diagram of the degree of vacuum, Figure 4 is a simplified configuration diagram showing the main parts of another embodiment of the present invention, and Figure 5 is a diagram of the conventional FIG. 2 is a simplified configuration diagram of the device. +11 (11...mold steam chamber, (2)...drain piping, (3)...drain valve, (4)...water storage tank, (5)...condenser part, (6) ... Cooling water spray nozzle, (7) ... Vacuum piping, (8) ... Vacuum pump, (9) ... Drain pipe.

Claims (3)

[Claims] (1) A drain pipe with a drain valve connected to the mold steam chamber is connected to an airtight water storage tank, and a condenser section having a cooling water spray nozzle is connected to the airtight water storage tank, and a vacuum pump is installed in this condenser section. A vacuum cooling device for a polystyrene foam molding machine, characterized in that a vacuum pipe is connected to the water storage tank, and a drain pipe is further connected to the water storage tank. (2) A vacuum cooling device for a polystyrene foam molding machine according to claim 1, characterized in that a condenser portion is integrally formed within an airtight water storage tank. (3) Connect the capacitor part to the upper part of the airtight water storage tank,
A vacuum cooling device for a foam molding machine according to claim 1, wherein the vacuum cooling device is in communication with the foam molding machine.