Steam heating system for controlling quick temperature change of injection mold

Abstract

The invention relates to a steam generating device, in particular to a steam heating system for controlling quick temperature change of an injection mold, which is particularly used for obtaining a resin polymer injection molding product with high quality appearance by realizing integration of modules such as a steam boiler, a steam reservoir, a steam controller and the like. The steam heating system comprises a water supply tank 9, one or more parallel electric heating steam generators 6 and a steam reservoir 2 which are connected in series by conduits; and each steam generator 6 is connected with the steam reservoir 2 by two conduits, wherein one of the conduits comprising a one-way valve 5 is directly connected with the steam reservoir 2. The steam heating system has the advantages that the water temperature in the water supply tank is improved and the energy consumption can be greatly reduced because the electric heating steam generators in the system can make full use of the heatof condensed water in the steam reservoir and the heat of the return water of the system to heat a heat exchanger in the water supply tank. For example, when a front frame of a 47' liquid crystal television is produced, the production energy consumption can be reduced by 50 percent by the steam heating system and the molding period is properly shortened compared with a steam generator of a large-sized boiler.

Description

technical field [0001] The invention relates to a steam generating device, in particular to a steam heating system for controlling the rapid temperature change of an injection mold. Polymer injection molding products. Background technique [0002] When injection molding plastic products with high-quality appearance, it is a common process method to control the rapid change of mold temperature. Due to the unique thermodynamic characteristics of steam, easy implementation, and stable process control, the use of steam as a heating medium is the most common. For example, the Chinese patent ZL200720075904.6 publicly authorized on December 24, 2008 discloses a device for controlling the temperature change of the injection mold developed to obtain high-quality appearance injection molded parts. It is developed for customers of boilers. The device requires users to have large-scale steam boilers, steam storage devices and steam pipelines. The problems in practice are: First, large...

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Problems solved by technology

For example, the Chinese patent ZL200720075904.6 publicly authorized on December 24, 2008 discloses a device for controlling the temperature change of the injection mold developed to obtain high-quality appearance injection molded parts. It is developed for customers of boilers. The device requires users to have large-scale steam boilers, steam storage devices and steam pipelines. The problems in practice are: First, large and medium-sized oil-fired gas-fired boilers require special boiler rooms. The site is far away, and generally a very long steam pipeline is required to connect the steam to the steam controller, so that the energy consumption caused by the heat dissipation of the pipeline is inevitable; secondly, due to the inevitable heat dissipation of the steam storage device and the Condensed water is formed in the condensed water, and the condensed water can only be regularly removed through the blowdown valve, taking away a large amount of heat, and cannot be recycled; third, when the steam is used for process control, the steam that passes through the mold is not recovered. It is directly drained or mixed with cooling water, resulting in a great waste of energy; Fourth, the steam produced by a large steam boiler can be provided to multiple injection molds through multiple steam controllers

However, if only one pair of injection molds is produced, a large steam boiler must also be turned on, which not only increases the operating cost, but also inevitably increases energy consumption; fifth, the procedures for installing a large steam boiler are complicated and there are many restrictions in use , causing user inconvenience

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