JPS5957714A - Apparatus for cooling mold for molding synthetic resin, etc. - Google Patents

Abstract

PURPOSE:To provide the titled apparatus that can keep a mold at an optimum temperature and can provide a good molded item and whose heat consumption and production cost are low, by providing a pump for delivering a refrigerant, a detector for detecting the temperature of the refrigerant, and an adjusting valve for adjusting the mixing ratio of refrigerants based upon a detected temperature signal. CONSTITUTION:Hot water having a temperature of T1 discharged from a mold 1 is sucked into an inlet S1 of the mixing valve 10, while cold water 3 from a low-temperature refrigerant source 14 is sucked into another inlet S2, the hot water and the cold water are mixed to obtain a mixture having a temperature of T3, and the mixture is discharged from the valve 10, is energized by the circulation pump 11, is passed to the temperature detector 9, and is returned to the mold 1 so that the mold 1 is cooled. This circulation is repeated. In this case, the temperature detector 9 is set at a prescribed temperature T0, and when the detected temperature value T4 is different from the set value, its signal is sent to an actuator of the mixing valve 10 to change the opening of the hot water inlet S1 or the cold water inlet S2 so that the mold is heated to the optimum temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an improvement in a device for maintaining an appropriate temperature of a refrigerant for cooling a mold for molding synthetic Japanese resin or the like.

The mold used to mold all the parts of the Akai Tsukuda Carp depends on the characteristics of the resin used and the appropriate temperature for each part of the mold. do.

Therefore, in the conventional device, as shown in Fig. 1,
The refrigerant that has undergone heat exchange in the mold 1 usually has increased humidity and is discharged, flows in the direction of the arrow by the action of the pump 5, first enters the cooler 2, and is sufficiently cooled. 3 is cooling water, and 4 is a heat exchanger. Next, the temperature of the refrigerant flowing out from the heater 6 is measured by the detector 9, and the value is fed back to the power supply 8 as shown by the dotted line arrow to adjust the voltage, and the 96 calorific value of the heating element 7 is adjusted. The mold 1 is cooled to a predetermined temperature. In this device, there is a cooler 2 in a series of refrigerant circulation paths, and after the refrigerant temperature is lowered below a predetermined humidity, the heater 6 corrects the temperature by the amount that has dropped too much. , It takes time to reach a predetermined temperature, and heat consumption is large, so a cooler 2 and a heater 6 are installed.

Since the entire space is required, the device rt becomes large and the dedicated IJ production cost becomes high. In addition, since the temperature gradient between the temperature of the refrigerant and the cooling water 3 needs to be 10°C or more, there has been an inconvenience that the lower limit of the controllable range for all types of temperature bars is 10°C or more higher than the temperature of the cooling water.

The present invention eliminates the above-mentioned partial consumption of mold cooling equipment (for synthetic resins, etc.), downsizes the device 7i, reduces its manufacturing cost, and controls the temperature of the refrigerant using the cooling water temperature. Control of the lower limit of the range 1)

To explain the h'6 configuration of the present invention with reference to an embodiment, Fig. 2 shows the case where water is used as the refrigerant, and the mixing valve 1
0 sucks the temperature T1 discharged from the mold 1 from the input OS 2, completely mixes both, and discharges the mixture at a temperature T3. The water that has exited the mixing valve 10 is energized by the circulation pump 11, passes through the temperature detector 9, and enters the mold 1, where the water temperature rises in accordance with the heat load and becomes hot water at a temperature T1. Refill mixing valve 1
0 and repeats the same cycle. In the water temperature sensor 9, the difference between the detected value T4 and the setting I1α is as follows.
The signal is sent to the actuator of the mixing valve 10.

12 is a hot water tank, and 13 is surplus hot water that has entered the hot water tank.

To explain the effects of the present invention having the above configuration, when a predetermined temperature To is set in the temperature detector 9, if the actual water temperature is T4, it will be T. A signal corresponding to the difference between and T4 is transmitted to the actuator of the mixing valve 10,
By changing the degree of opening of the hot water inlet sl or the cold water inlet S2, the mixing ratio of hot water and cold water is corrected so that the temperature T4 becomes a predetermined value To. Since the total amount of water in the cooling water circulation system increases by the amount of cold water hl that enters from the inlet S2 of the mixing valve 10, the water in the circulation system becomes redundant by that claw, and is circulated as hot water at temperature T1 that comes out of the mold 1. Enter hot water tank 12 outside the prefecture. The hot water 13 in the hot water tank is discarded if it has no other use. In the cooling device for a mold for molding synthetic resin or the like according to the present invention, by disposing the mixing valve 10, the refrigerant (water in the embodiment) is not cooled with a separate cooling and heating temperature, and
There is no need to reheat the refrigerant once it has been cooled. Therefore,
What does it take to heat? Since there is no energy consumption such as heat, and there is no need for coolers, heaters, or the space required for them, the manufacturing cost of the equipment can be reduced to a large amount, and the equipment can be made smaller. can. In addition, since the cold water outside the threads is directly mixed with water as a refrigerant, if 9.5 is required in the summer, etc., the amount of wet water that enters from the inlet S1 of the mixing valve is set to zero, and the amount of cold water that enters from the inlet S2 is set to 100%. At this time, the temperature of the water flowing inside the mold is the same as the temperature of the cold water outside the system, and the required temperature gradient in conventional equipment is 0°C.
Restrictions on the lower limit of the temperature control range due to can be avoided.

Note that it is equally effective to install the temperature detector 9 in this study by setting one location on the outlet side of the cooling water of the mold 1 and transmitting the signal at the IK to the actuator of the mixing valve 10 at that location. Further, it is also possible to use a refrigerant that uses something other than water as a refrigerant, to make the hot water tank 13 and the link 14 of the cooling water 3 a closed type, and to cool the refrigerant using a cooler (not shown). It is valid as [F11 effect is also obtained when the detector 9 is built into the mixing valve 10, 1~<fd', Sz, or the outlet 83 hemorrhoid.

[Brief explanation of drawings]

Figure 1 shows the 116 configurations of the conventional device.
FIG. 2 is a layout diagram showing the structure of the apparatus according to the present invention. l...Mold, 2...Cooler, 3...Cooling water, 6...
・Heater, 9...Detector, 10...Mixing valve, 11.
...One person fishing from the circulation pump Isao Kaneoka Agent Goho - Keiji Figure 1 Figure 2

Claims (1)

[Claims] A pump that sends a refrigerant that exchanges heat with a mold for molding synthetic resin, etc., a detector that measures the temperature of the refrigerant flowing into the mold, and a refrigerant that flows out of the mold based on the temperature signal detected by the detector. and a refrigerant supplied from another low-temperature refrigerant source.