JPH10146839A - Heat exchanger device for mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger device for a mold in which the sufficiently high heat exchange efficiency can be retained. SOLUTION: Heat exchange chambers 8 and 9 are formed inside molds 1 and 2. Double pipes 5 and 6 are installed in the heat exchange chambers 8 and 9. Heat exchange medium feed lines 3 and 4 are connected with outer pipe sections 11 and 12 of the double pipes 5 and 6, and a plurality of openings 15 are opened in the heat exchange chambers 8 and 9. Lower end openings 24 and 25 of inner pipe sections 13 and 14 of the double pipes 5 and 6 are opened on the lower end of the heat exchange chambers 8 and 9, while the upper ends are connected with a suction means 7 through a communicating pipe 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for molding a resin by heating or cooling a mold. Usually, when molding a thermoplastic synthetic resin in a mold, the mold is heated or cooled as necessary during a cycle from injection of the raw material into the mold to molding and release. .

[0002]

2. Description of the Related Art As a conventional mold heat exchanger, there is one described in, for example, Japanese Patent Application Laid-Open No. 8-52742. In this method, a cooling fluid reservoir made of metal is provided inside the heat exchange chamber to promote the convection of vaporized vapor in the heat exchange chamber, thereby improving the cooling efficiency.

[0003]

In the above-mentioned conventional mold heat exchanger, there is a problem that the supplied cooling fluid cannot be immediately vaporized and a sufficiently high cooling efficiency cannot be obtained yet. Was. That is, when the temperature of the cooling fluid supplied to the heat exchange chamber is low, the supplied cooling fluid does not immediately evaporate, but evaporates only when the temperature reaches a predetermined temperature corresponding to the pressure of the heat exchange chamber. Until the temperature reaches the predetermined temperature, evaporative cooling is not performed, and thus a sufficiently high cooling efficiency cannot be obtained.

[0004] It is therefore an object of the present invention to provide a mold heat exchange device having a sufficiently high heat exchange efficiency, in which the supplied heat exchange medium is immediately vaporized.

[0005]

According to the present invention, there is provided a heat exchange apparatus for a mold, comprising: a mold having a heat exchange chamber and a molding section; a supply path for supplying a heat exchange medium to the heat exchange chamber; Provided with a valve means for controlling the passage of the medium provided in the heat exchange chamber, and a suction means for sucking the medium in the heat exchange chamber. A plurality of openings for supplying a heat exchange medium to the heat exchange chamber by connecting a supply path to the heat exchange chamber, and connecting the suction means to the inner pipe part of the double pipe to communicate the heat exchange chamber and the suction means. It is.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A heat exchange medium supplied from an outer tube portion of a double tube via a supply passage is supplied to a heat exchange chamber from a plurality of openings to remove heat from a heat exchange target. Cools the heat exchanged material. Steam that takes away heat and heats up and evaporates,
The residual heat exchange medium that has not been completely vaporized is sucked from the inner tube portion of the double tube to the suction means.

[0007] The temperature of the vaporized vapor and the residual heat exchange medium sucked from the inner tube is increased, and the temperature of the heat exchange medium supplied from the outer tube of the double tube is increased while being sucked by the suction means. . Therefore, the heated heat exchange medium is supplied to the heat exchange chamber from the plurality of openings of the outer pipe portion, and the supplied heat exchange medium is immediately vaporized, thereby increasing the heat exchange efficiency. it can.

[0008]

In FIG. 1, a pair of left and right molds 1 and 2, supply paths 3 and 4 for a heat exchange medium, double pipes 5 and 6 mounted in the respective molds 1 and 2, and suction The means 7 constitutes a mold heat exchange device.

The molds 1 and 2 have hollow portions 8 and 9 formed therein, and the hollow portions 8 and 9 are used as heat exchange chambers. The central part of the molds 1 and 2 is used as a molding part 10, and a molding raw material (not shown) is injected and molded in the molding part 10. The double tubes 5 and 6 are attached inside the heat exchange chambers 8 and 9. The double tubes 5 and 6 are respectively composed of the outer tube portions 11 and 12 and the inner tube portion 1.
3 and 14, connecting the supply passages 3 and 4 for the heat exchange medium to the upper ends of the outer pipe portions 11 and 12, and connecting the heat exchange chambers 8 and
A plurality of apertures 15 are provided that open in the interior 9.

In the heat exchange medium supply paths 3 and 4, refrigerant supply pipes 16 and 17 for cooling water and the like, and heat medium supply pipes 18 and 19 for heating steam and the like are respectively connected to valve means 20 for controlling passage of the medium.
21, 22 and 23. The heat exchange medium supplied from the supply passages 3 and 4 is supplied to the outer tube portions 1 of the double tubes 5 and 6.
These are supplied into the heat exchange chambers 8 and 9 from the openings 1 and 12 and the plurality of openings 15.

The inner tubes 13, 14 of the double tubes 5, 6 penetrate the upper and lower ends of the outer tubes 11, 12, and open their lower end openings 24, 25 in the heat exchange chambers 8, 9. It is opened below, and upper ends 26 and 27 are flexible pipes 28 and 29.
And the suction means 7 through the communication pipe 30. The inner pipe portions 13 and 14 are connected to the heat exchange chambers 8 and
The suction means 7 sucks the fluid in the suction pipe 9 through the communication pipe 30.

The suction means 7 comprises an ejector 31 and a tank 32
And a circulation pump 33 and a circulation path 34. The tank 32 is connected to a cooling fluid replenishing pipe 35 for replenishing the inside of the tank 32 with a cooling fluid, and is connected to an atmosphere communicating pipe 37 communicating with the atmosphere via a valve means 36. The fluid in the tank 32 is circulated by the circulation pump 33 to eject the ejector 31.
By causing the ejector 31 to flow down, a suction force corresponding to the fluid temperature is generated in the ejector 31 portion.

When heating the dies 1, 2, the valve means 22,
The valve 23 is opened to supply a heat medium, for example, a heating steam, from the heat medium supply pipes 18 and 19 through the supply paths 3 and 4, the outer pipes 11 and 12 of the double pipes 5 and 6, and the plurality of apertures 15. The heat is supplied to the heat exchange chambers 8 and 9. The supplied steam heats the molds 1 and 2, and the steam condenses and becomes condensed water, and accumulates at the bottoms of the heat exchange chambers 8 and 9. The condensed condensate is supplied to the lower end openings 24, 25 of the inner pipe portions 13, 14.
Is sucked by the ejector 31 of the suction means 7 from the tank 32
Leads to.

Next, in the case of cooling, instead of supplying steam, refrigerant, for example, cooling water is supplied from the refrigerant supply pipes 16 and 17 through the outer pipes 11 and 12 and the plurality of openings 15 to the heat exchange chambers 8 and
9. The supplied cooling water vaporizes and cools the molds 1 and 2 by removing heat from the molds 1 and 2 and vaporizing. In this case, the inside of the heat exchange chambers 8 and 9 is
The cooling water is sucked by the suction means 7 via the inner pipe portions 13 and 14 to be in a reduced pressure state, and the supplied cooling water is vaporized more quickly to vaporize and cool the dies 1 and 2.

The vapors vaporized in the heat exchange chambers 8 and 9 and the residual cooling water not vaporized are also sucked into the ejectors 31 of the suction means 7 from the lower end openings 24 and 25 and the inner pipes 13 and 14. . The vaporized steam and the residual cooling water that have been heated to cool the molds 1 and 2 raise the temperature of the cooling water that flows down in the outer pipe portions 11 and 12 from the openings 24 and 25 to the communication pipe 30. Let it. Therefore, the heated cooling water supplied from the plurality of openings 15 is immediately vaporized, so that the efficiency of vaporizing cooling can be increased.

[0016]

The heat exchange medium supplied from the outer tube portion of the double tube is heated by the vaporized steam and the residual heat exchange medium in the inner tube portion, so that the heat exchange medium is supplied to the heat exchange chamber. Can be vaporized immediately without the need for time to raise the temperature, and high heat exchange efficiency can be maintained.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional configuration diagram showing an embodiment of a mold heat exchange device of the present invention.

[Explanation of symbols]

 1, 2 Mold 3, 4 Heat exchange medium supply path 5, 6 Double pipe 7 Suction means 8, 9 Heat exchange chamber 11, 12 Outer pipe 13, 14 Inner pipe 15 Plural openings 31 Ejector 32 Tank 33 circulation pump

Claims (1)

[Claims] 1. A mold having a heat exchange chamber and a molding section, a supply path for supplying a heat exchange medium to the heat exchange chamber, and valve means for controlling passage of the medium provided in the supply path. In the apparatus provided with suction means for sucking the medium in the heat exchange chamber, a double pipe is mounted in the heat exchange chamber, and a supply path is connected to an outer pipe section of the double pipe to transfer the heat exchange medium to the heat exchange chamber. A heat exchange device for a mold, comprising a plurality of apertures to be supplied, and a suction means connected to an inner pipe part of the double pipe to communicate the heat exchange chamber with the suction means.