JPS62227608A - Mold temperature controlling apparatus - Google Patents

Abstract

PURPOSE:To allow the direct use of cooling water without running a refrigerator when refrigerant temperature is high by a constitution wherein refrigerant to cool a condenser belonging to the refrigerator is allowed to mix with the refrigerant heat- exchanged at a mold. CONSTITUTION:A refrigerator is normally run in the state that valves 18 and 19 are closed and valves 4 and 16 are opened and cooling water comes from an inlet pipe 15 through a valve 16 into a condenser and escapes from an outlet pipe 29. Next, when high refrigerant temperature is allowed and the cooling water is directly used as refrigerant, the valves 18 and 19 are opened and the valves 4 and 16 are closed and then the running of the refrigerator is stopped. Thus, the cooling water flows not to the condenser but to a tank 1 through a cooling water bypass pipe 17 and a bypass pipe 6 so as to be sent by means of a pump 2 through a discharge line 3 to a mold 11 in order to be back through a return line 22 to the tank 1 after cooling the mold. In addition, the cooling water flowing through a bypass pipe 20 branched off from the discharge line 3 passes through the valve 19 so as to be discharged through the outlet pipe 29. In case that high refrigerant temperature is allowed as described above, temperature control is enabled by mixing the cooling water of the condenser in the refrigerant course.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a mold temperature equipment for controlling the temperature of a mold for molding synthetic resin or the like within a predetermined range, and relates to a cooling refrigerant. If a high temperature is acceptable, the cooling water from the refrigerator can be used directly as a refrigerant for the mold without using the refrigerator.

BACKGROUND ART In order to control the temperature of a mold for molding synthetic resin or the like within a predetermined range, a mold temperature control device for cooling the mold is required.

Figure 4 shows the system of a conventional mold temperature control device, in which the refrigerant goes from the storage tank 1 to the mold 1) via the pipe 3 by the pump 2, and the refrigerant whose temperature has risen by cooling the mold returns to the pipe. 2
2, the flow returns to the storage tank 1 in the main system, but part of the refrigerant from the pipe 3 enters the bypass pipe 26, is cooled by the evaporator 5 of the refrigerator, passes through the flow rate control valve 7, and joins the return pipe 22. be done. The refrigerator includes a compressor 23, a condenser 24,
It has an expansion valve 25, a cooling water inlet pipe 15, a valve 16, an outlet pipe 29, and the like. The refrigerant flowing from the evaporator 5 into the return pipe 22 flows through the bypass pipe 8 before the control valve 7.
A portion of the water flows into the pump 2, passes through the flow control valve 9, and is connected to the suction port of the pump 2. This flow rate control valve 9 corrects minute fluctuations in refrigerant temperature that the flow rate control valve 7 could not cope with. The valve 14 of the flow path 12 that passes through the mold is normally closed, and the valve 10.13 is open. At the start of operation of the device, open valve 14 until the set moderation is reached, and then open valve 1 ().
, 13 are closed, and there is no need for valves 14, 10, 13, etc. during normal operation (tank l is provided with heating means, although not shown). be.

Generally, the refrigerant of the mold temperature control device is used in a wide range of temperatures from low to high temperatures depending on the type of synthetic resin to be molded. In the case of a low-temperature refrigerant that is lower than the cooling water temperature, it is necessary to control the refrigerant temperature using a refrigerator, but if the required refrigerant temperature is higher than the cooling water temperature of the refrigerator, it is uneconomical to operate the refrigerator. Therefore, it is better to use the cooling water as it is as a refrigerant for adjusting the island degree of the mold.

Means for Solving the Problems In this invention, in order to solve the conventional drawbacks, the cooling water piping to the condenser is branched, and one is connected to the condenser and the other is connected to the return piping from the mold. If the temperature of the refrigerant used to cool the mold can be high, the operation of the refrigerator is stopped, and the cooling water is not led to the condenser, but directly fed into the refrigerant circuit of the mold and used as a refrigerant.

Embodiment FIG. 1 shows a first embodiment of the present invention, the main parts of which are the same as those of FIG. 4, and the same reference numerals as in FIG. 4 represent the same parts. In this invention, the cooling water inlet pipe 15 is branched, and one side enters the condenser 24 through the valve 16 as in the conventional case, and the other side becomes the cooling water bypass "J17" and joins the refrigerant bypass pipe 6 through the valve 18. are doing.

Also, a refrigerant bypass pipe 26 from the discharge pipe 3 from the pump 2
A valve 4 is provided upstream of the evaporator.

Further, the cooling water discharge W29 and the discharge pipe 3 are connected to each other via a valve 19 by a bypass pipe 20. This valve 19 is a limit switch 27 that controls the water level of the tank 1.
This is to prevent oats from flowing into the tank. Acupuncture lines indicate signal lines.

What about Figure 1? Figure 4 shows the state of the system when the refrigerator is operating, and the valves 18 and 19 painted in black are closed. (As mentioned above, valve 14 is normally closed.) Also, valve 4.16 is left open. The refrigerator then operates normally, with cooling water passing from the inlet pipe 15 through the valve 16 into the condenser and out through the outlet pipe. The operation of the refrigerant for cooling the mold is also as explained in Fig. 4.

Next, if the refrigerant temperature is high and the cooling water is used directly as a refrigerant, as shown in Figure 2,
is opened, valve 4.16 is closed, and operation of the refrigerator is stopped. In this case, the cooling water does not go from the pipe 15 to the condenser, but from the cooling water bypass pipe 17 to the bi/miss pipe 6, goes to the tank 1, and is then discharged from the discharge pipe 3 by the pump 2 to the mold 1).
After cooling the mold, it passes through the return pipe 22 to the tank 1.
Return to Further, the cooling water is discharged through a bypass pipe 20 branched from the discharge pipe 3 to an outlet pipe 29 via a valve 19t. The tank 1 is provided with a level switch γ, which detects the upper and lower limits of the water level in the tank and opens and closes the valve 19 to prevent the tank 1 from overflowing.

In this way, when the refrigerant does not need to be at a high temperature, temperature control is possible by mixing the cooling water of the condenser into the refrigerant path.

FIG. 3 is basically the same as FIG. 2, but is a second embodiment in which an outflow pipe 21 and a valve 28 are provided on the side of the upper limit water level W in the tank 1 to prevent overflow of the tank 1. It is clear that the level switch 27, valve 19, and pass pipe 20 are omitted when compared with FIG.

Effect This invention has such a configuration, and the cooling water of the condenser of the refrigerator can be used as a refrigerant for mold cooling.When the refrigerant temperature is high, the cooling water is used directly and the refrigerator This is an extremely economical device since there is no need to drive the machine.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the cooling system of the device of the present invention,
Figure 2 shows the case where the refrigerator is running and 7-C is on, Figure 2 shows the case where the refrigerator is actually stopped, and Figure 3 shows another example in which an overflow valve is installed in the tank. FIG. 4 is a diagram showing a conventional cooling system. Explanation of symbols 1...Tank 2...Pump 3...1 discharge tube 4...Valve 5...Evaporator
6... Refrigerant bypass 7... Valve
8... Refrigerant bypass 9... Valve 10
... Valve 1), ... Gold q 12 ... Bypass piping 13 ... Valve 14 ... Valve 1
5... Cooling water inlet pipe 16... Valve 17... Cooling water bypass 18... Valve 19... Valve
20... Cooling water return pipe 21... Outflow pipe
22...Return tube 23...Compressor
24... Condenser 25... Expansion valve 2
6... Refrigerant pi/g stuff... Limit switch
28... Valve 29... Cooling water outlet pipe

Claims (3)

[Claims] (1) A pump for pumping refrigerant installed on the upstream side of a mold used for molding synthetic resin, etc., a refrigerant storage tank installed on the suction side of the pump, and a cooling piping branched from the discharge side of the pump. , is equipped with a refrigerator composed of a compressor, a condenser, an expansion valve, an evaporator, etc., and adjusts the refrigerant temperature by mixing the refrigerant cooled by the refrigerator with the refrigerant heat-exchanged in the mold. A mold temperature control device, characterized in that the mold is configured such that a refrigerant for cooling a condenser attached to the refrigerator can be mixed with the refrigerant heat-exchanged in the mold. Temperature control device. (2) The above-mentioned patent claim is characterized in that the cooling water inlet pipe of the condenser is branched, one of which is connected to the condenser inlet, and the other connected to the return pipe to the tank and/or the pump suction side. The mold temperature control device according to item 1. (3) A valve is provided immediately before the cooling water inlet for cooling the condenser, immediately before the mold refrigerant inlet of the evaporator, and in a pipe branched from the cooling water inlet pipe of the condenser. A mold temperature control device according to claim 2.