JP4149209B2 - Mold heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold heat exchanging apparatus for heating or cooling a heat exchange object, and more particularly to an apparatus that uses a fluid staying in a tank of a suction means as a cooling fluid in a reverse flow.
[0002]
[Prior art]
As a conventional mold heat exchanging apparatus for heating and cooling, for example, the one disclosed in Japanese Patent Application Laid-Open No. 7-276369 has been used. This is a device that molds synthetic resin with a mold. A heating / cooling chamber is formed inside the mold, a heating fluid supply pipe and a cooling fluid supply pipe are connected to the heating / cooling chamber, and heating / cooling is performed. The chamber is connected to the suction means and can be molded with a short molding cycle.
[0003]
[Problems to be solved by the invention]
The conventional mold heat exchange device requires a cooling fluid supply pipe for supplying a cooling fluid to the heating / cooling chamber and a valve means for supplying and stopping the cooling fluid, and the heat exchange device itself. However, there is a problem that the size and size become complicated.
[0004]
Accordingly, an object of the present invention is to obtain a small-sized and simple mold heat exchange device without using a cooling fluid supply pipe and valve means.
[0005]
[Means for Solving the Problems]
Means for solving the above-described problems are that heating steam or cooling water is supplied to the heating / cooling chambers 6, 7 as heat exchange chambers, and the suction means 5 is connected to the heating / cooling chambers 6, 7 via the pipe line 4. The suction means 5 is composed of an ejector 14, a tank 15 and a circulation pump 16. The lower part of the tank 15 and the suction port of the circulation pump 16 are connected, and the discharge port of the circulation pump 16 is connected to the suction of the ejector 14. By connecting to the unit 17, the liquid in the tank 15 is circulated to the ejector 14 side by the circulation pump 16 to generate a suction force by the ejector 14, and the heating / cooling chamber 6 through the pipe line 4 is generated by the suction force. 7 in which the condensed steam of the heating steam generated in 7 or the cooling water is sucked, the branch lines 8 and 9 are attached to the pipe line 4 and the branch line 9 is further branched to the other side. A conduit 18 is provided; Branch pipes path 8, 18 is connected to the heating and cooling chambers 6 and 7, and the branch pipe 9, on the other branch pipe 18 branch line 9 is branched, attach a check valve 25 and 26, the The check valve 25 allows passage of fluid from the heat exchange chamber 7 toward the ejector 14 and prevents passage of fluid in the opposite direction, while the check valve 26 passes from the ejector 14 to the heat exchange chamber 7. It allows passage of fluid in the upper direction and prevents passage of fluid in the opposite direction, and causes the liquid in the tank 15 to flow backward to the heating and cooling chambers 6 and 7 in a vacuum state below atmospheric pressure. .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Since the cooling fluid flows backward from the tank of the suction means and is supplied to the heat exchange chamber, it is not necessary to provide a dedicated cooling fluid supply pipe and valve means.
[0007]
【Example】
In the present embodiment, an example in which molds 1 and 2 are used as a heat exchange device is shown. In FIG. 1, a pair of left and right molds 1, 2, a heating fluid supply pipe 3, and a suction means 5 constitute a heat exchange device.
[0008]
The molds 1 and 2 have hollow portions 6 and 7 formed therein, and the hollow portions 6 and 7 serve as heat exchange chambers. A molding synthetic resin material (not shown) is injected into the central portion 13 of the molds 1 and 2 and molded. A steam supply pipe 3 for supplying steam as a heating fluid is connected to the upper part of the heat exchange chambers 6 and 7. A pressure control valve 10 and an opening / closing valve 11 for controlling the supply steam pressure are attached to the steam supply line 3.
[0009]
The suction means 5 is connected to the lower part of the heat exchange chambers 6 and 7 through the pipe line 4. The suction means 5 includes an ejector 14, a tank 15, and a circulation pump 16. The ejector 14 includes a suction unit 17 that incorporates a nozzle (not shown). The outlet of the ejector 14 is connected to the tank 15, the lower part of the tank 15 is connected to the suction port of the circulation pump 16, and the discharge port of the circulation pump 16 is connected to the suction part 17 of the ejector 14.
[0010]
The ejector 14 circulates the fluid in the tank 15 by the circulation pump 16 and passes it through the suction unit 17, thereby generating a suction force at the built-in nozzle unit. Although not shown, the tank 15 is provided with a liquid level sensor for detecting the internal liquid level and a temperature sensor for detecting the liquid temperature. An excess fluid discharge pipe 29 is connected to the circulation path 27 via an on-off valve 28. A cooling fluid supply pipe 20 for supplying a cooling fluid such as water is connected to the upper portion of the tank 15 via an on-off valve 22.
[0011]
The cooling fluid supply pipe 20 is connected to the cooling fluid pipe 21. Further, the cooling fluid pipe 21 is connected to the heat exchange chambers 6 and 7 via the on-off valve 23. By opening the on-off valve 23, the cooling fluid can be supplied from the cooling fluid pipe 21 to the heat exchange chambers 6 and 7.
[0012]
The pipe line 4 is connected to the respective heat exchange chambers 6 and 7 by branch pipe lines 8 and 9. The branch pipe 9 is further connected to the upper part of the heat exchange chamber 7 by a branch pipe 18. A check valve 25 is attached to the branch pipe 9, and a check valve 26 is attached to the branch pipe 18. The check valve 25 allows passage of fluid from the heat exchange chamber 7 toward the ejector 14 and prevents passage of fluid in the opposite direction, while the check valve 26 passes from the ejector 14 to the heat exchange chamber 7. Allow the passage of fluid in the upper direction and prevent the passage of fluid in the opposite direction.
[0013]
When the molds 1 and 2 are heated, the set pressure value of the pressure control valve 10 provided in the steam supply line 3 is set to a predetermined value, the on-off valve 11 is opened, and the heating supply line 3 is heated from the steam supply line 3. Steam is supplied to the heat exchange chambers 6 and 7. The molds 1 and 2 are heated by steam of a predetermined pressure, that is, temperature, and the steam that has been deprived of heat is condensed and becomes condensed water, and is sucked into the suction part 17 of the suction means 5 through the pipe 4.
[0014]
The heating temperature can be appropriately set by adjusting the set pressure of the pressure control valve 10 and the temperature of the liquid that passes through the suction force of the suction portion 17. For example, when the molds 1 and 2 are heated with relatively low temperature steam of 100 ° C. or lower, the set pressure of the pressure control valve 10 is set to a vacuum pressure of atmospheric pressure or lower, and the suction force of the suction means 5 is set to the pressure control valve. This can be done by slightly lowering the set pressure of 10.
[0015]
On the other hand, when cooling, the on-off valve 11 of the steam supply line 3 is closed to stop the supply of steam and the circulation pump 16 is stopped so that the heat exchange chambers 6 and 7 are in a vacuum pressure state. And the residual steam is condensed due to heat radiation, so that the pressure is further reduced, and the cooling fluid in the tank 15 flows back through the circulation pump 16, the ejector 14, and the pipe 4 into the heat exchange chambers 6 and 7. The molds 1 and 2 are cooled.
[0016]
The cooling fluid that has reached the branch line 9 from the pipe line 4 further flows into the heat exchange chamber 7 from above through the check line 26 from the branch line 18. On the other hand, the cooling fluid reaching the branch pipe 8 from the pipe 4 flows into the heat exchange chamber 6 from below.
[0017]
The cooling fluid that has cooled the molds 1 and 2 in the heat exchange chambers 6 and 7 is sucked into the ejector 14 and flows into the tank 15 again by driving the circulation pump 16.
[0018]
The temperature at which the molds 1 and 2 are cooled can be appropriately controlled by adjusting the temperature of the cooling fluid in the tank 15 by supplying cooling fluid from the cooling fluid supply pipe 20.
[0019]
【The invention's effect】
According to the present invention, the cooling fluid in the tank is caused to flow back to the heat exchange chamber due to the pressure difference, thereby eliminating the need for the cooling fluid supply pipe and the valve means, thereby providing a small and simple mold heat exchange device. be able to.
[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.

Claims (1)

Heating steam or cooling water is supplied to the heating / cooling chambers 6 and 7 serving as heat exchange chambers, and the heating / cooling chambers 6 and 7 are connected to the suction means 5 via the pipe line 4. The suction means 5 is connected to the ejector 14. The tank 15 and the circulation pump 16 are connected to each other, and the lower part of the tank 15 and the suction port of the circulation pump 16 are connected, and the discharge port of the circulation pump 16 is connected to the suction part 17 of the ejector 14 so that the inside of the tank 15 The liquid is circulated to the ejector 14 side by the circulation pump 16 and a suction force is generated by the ejector 14, and the heating steam generated in the heating / cooling chambers 6 and 7 is condensed by the suction force through the pipe line 4. In the case of sucking water or cooling water, branch pipes 8 and 9 are attached to the pipe line 4, and the branch pipe line 9 is further provided with a branch pipe line 18 branched to the other side. 18 heating and cooling chambers 6 and 7 Connected, and the branch pipe 9, the branch line 9 is the other branched branch pipe 18, is attached a check valve 25, the check valve 25 to the ejector 14 direction from the heat exchange chamber 7 The check valve 26 allows the passage of fluid from the ejector 14 to the upper part of the heat exchange chamber 7 and prevents the passage of fluid in the opposite direction. A mold heat exchange device for preventing fluid from passing therethrough and causing the liquid in the tank 15 to flow back to the heating / cooling chambers 6 and 7 in a vacuum state below atmospheric pressure.

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