TWI594864B - Molding temperature control system - Google Patents

Description

Temperature adjustment system for forming mold

The present invention relates to a temperature adjustment system for controlling a mold for molding a synthetic resin to a desired set temperature. In particular, the present invention can use a temperature adjustment system for forming a mold having a desired mold temperature in a temperature range of a wider range by using the waste heat of the mold and the cooling of the cooler.

Conventionally, in the plastic molding, the molten resin which is ejected from the molding machine into the mold is cooled and solidified in the mold, and after sufficiently cooled, it is taken out to the outside of the mold to produce a plastic molded article.

As means for cooling the mold, a method of circulating a cooling liquid cooled by a cooling device in a mold is employed. Generally, a circulation flow path through which a coolant passes is provided inside the mold, and by maintaining the coolant at a constant temperature, temperature control is performed to adapt the mold temperature to the molding temperature. In general, the mold temperature corresponds to the heat distortion temperature of the resin to be formed, and is controlled within the range of 10 ° C to 30 ° C (hereinafter, also referred to as "low temperature region").

However, in the case of a resin having a high heat distortion temperature, the mold temperature is maintained at a temperature higher than normal temperature, for example, EVA resin or ABS resin, 40 ° C to 60 ° C (hereinafter, also referred to as "medium temperature range"). situation. In this case, only the cooling system constituted by the above cooling circulation circuit cannot correspond.

Therefore, the applicant of the present invention has proposed a temperature adjustment system for a molding die shown in Patent Document 1. According to the invention, waste heat can be utilized by using a mold The cooling with the chiller saves the desired mold temperature energy-efficiently and efficiently in the vicinity of 60 ° C in the low temperature range of 10 ° C to the intermediate temperature range.

Patent Document 1: Japanese Patent No. 4755677

However, there is a case where the mold temperature is maintained at a high temperature of about 90 ° C like a polycarbonate resin. In this case, only the waste heat utilization of the above mold is difficult to maintain the coolant at 90 °C.

Therefore, the main object of the present invention is to provide a simple structure that can use the mold temperature of the mold in the low temperature range to the medium temperature range by using the waste heat of the mold and the cooling of the cooler, and can be further stably used in the high temperature range. (that is, 10 ° C ~ 90 ° C) temperature adjustment system for forming molds.

Moreover, although the power consumption is used when the cooler is used, the electricity rate is set to be less during the day when the amount of power used is smaller than when the amount of power used is peaked. Therefore, it is expected that a tempering system that can operate the chiller at night when the electricity bill is cheap to generate ice to preheat heat and dissolve the ice at the peak of the daytime power usage to save power and simultaneously adjust the temperature, has been expected. The temperature adjustment system has not been designed to easily change the state of use of the device to a mode in which ice is efficiently generated or to a mode in which the generated ice is efficiently used to save power. An object of the present invention is to provide a temperature control system capable of performing a temperature adjustment operation while simultaneously actively and efficiently generating ice or actively dissolving ice.

In order to achieve the above object, a temperature adjustment system for a molding die of the present invention is composed of a member that can cool a frozen liquid while cooling the same The cooling liquid generates an evaporator for ice; the cooling tank is provided by the cooling space on the upstream side and the liquid supply space on the downstream side, and the evaporator of the cooling device is disposed in the cooling space, and the evaporator is cooled. a cooling liquid; an adjustment tank for accommodating the coolant supplied from the liquid supply space of the cooling tank; a coolant circulation flow path, returning from the adjustment tank to the adjustment tank via the mold; and a branching flow path from the coolant circulation flow path a cooling space that reaches the cooling tank after branching; a control valve is disposed on the way of the branching flow path; and a first temperature sensor detects a temperature of the cooling liquid in the adjusting tank or the coolant circulating flow path; The heater is provided in the adjustment tank or in the coolant circulation flow path, and has a function of controlling the on/off operation by comparing the detected temperature of the first temperature sensor with a preset heating start set temperature; The heater is formed to be turned on when the detected temperature of the first temperature sensor is equal to or lower than the heating start set temperature, and is set to be equal to or higher than the heating start set temperature. a disconnection operation; when the detected temperature of the first temperature sensor is equal to or higher than a preset cooling start set temperature, the control valve is opened to return a portion of the high temperature coolant of the coolant circulation flow path to the cooling tank Cooling space; corresponding to the amount of liquid returning to the cooling space of the cooling tank, the low-temperature coolant flows into the adjusting tank from the liquid feeding space of the cooling tank, and the cooling tank and the adjusting tank are separated by a partition wall a second temperature sensor for detecting the temperature of the coolant in the cooling tank is provided in the vicinity of the boundary between the cooling space of the cooling tank and the liquid supply space, and the temperature is detected by the second temperature sensor. The cooling device is controlled to control the temperature of the coolant in the cooling tank while controlling the formation of ice in the cooling space.

According to the present invention, the mold is cooled by the circulation of the cooling liquid in the adjustment tank which is separated from the cooling tank, and if the coolant temperature is increased by the mold temperature to a predetermined cooling start set temperature or higher, the coolant circulation One part of the high-temperature coolant of the flow path is returned to the cooling tank, and the low-temperature coolant flows into the adjustment tank from the cooling tank according to the amount of the returned liquid, and the circulating coolant in the adjustment tank can be automatically adjusted to the set temperature. Thus, by the effective use of the waste heat of the mold and the cooling by the cooling device, the temperature of the mold coolant in the temperature range from about 10 ° C to about 60 ° C can be obtained with energy saving.

Further, in the case where a resin such as a polycarbonate resin is required to be formed at a high temperature of 60 ° C, specifically, a temperature of about 90 ° C, a heater attached to the system is used. Thereby, the temperature of the mold coolant in the adjustment tank can be raised to a high temperature of, for example, 90 ° C, and it can be used in the case of resin molding in a polycarbonate-like high temperature range. Further, since the heater can be installed only in the middle of the adjustment tank or the circulation flow path, the configuration is simple and the cost can be reduced.

In the present invention, the cooling groove and the adjustment groove are formed in a single body structure by a partition wall. By the two-slot integrated structure, the entire groove can be miniaturized and the installation space can be reduced. Further, the temperature of the coolant in the cooling bath is maintained constant by the second temperature sensor, and the mold can be cooled constantly.

Further, an evaporator for cooling the cooling liquid is disposed inside the cooling tank, and the evaporator generates ice in the cooling tank.

Thereby, the hidden evaporator makes the appearance impression compact, and the heat efficiency can be improved by the large amount of heat accumulated in the ice generated in the cooling tank.

Then, the cooling tank and the adjustment tank are formed in a single body structure by a partition wall, and a second portion for detecting the temperature of the coolant in the cooling tank is provided in the vicinity of the boundary between the cooling space of the cooling tank and the liquid supply space. The temperature sensor controls the cooling device by the detected temperature of the second temperature sensor to control the temperature of the coolant in the cooling tank while controlling the formation of ice in the cooling space.

Thereby, the second temperature sensor that detects the temperature of the coolant in the cooling tank is provided in the cooling tank, and the temperature of the coolant in the cooler is maintained constant by detecting the temperature control cooler.

Further, by providing the second temperature sensor in the vicinity of the boundary between the cooling space and the liquid supply space, the second temperature sensor is maintained between the water phase around the sensor temperature sensing portion even if ice is generated on the surface of the solenoid. The approximate freezing point temperature (0 ° C) is detected and displayed, so that ice can be continuously generated. After the ice growth thickness is increased and the temperature sensing portion of the sensor is touched, the low temperature below the freezing point is detected. As a result, ice generation and growth can be monitored from the display temperature of the second temperature sensor.

In the above invention, in the invention in which the evaporator is disposed inside the cooling tank, the cooling tank has a cooling space in which the evaporator is disposed on the upstream side and a cooling space in which the evaporator is disposed, and a coolant is connected to the downstream side of the cooling space. The liquid feeding space is sent to the flow path of the adjusting tank; the end portion of the branching flow path is at least divided into two to form a plurality of cooling tank connecting flow paths, and one of the cooling tank connecting flow paths is connected to the cooling space provided a connection port for ice dissolution, one of which is connected to an ice generation connection port provided in a cooling space provided near the liquid supply space or the liquid supply space; and the switching flow is provided in the branch flow path from the coolant circulation Cooling tank connection of high temperature coolant The flow path switching mechanism of the flow path.

According to the present invention, the cooling space in which the evaporator is disposed in the cooling tank generates ice or the ice generated by the dissolution, but the cooling liquid which is heated from the branching flow path is introduced into the cooling tank when the ice is dissolved and the ice is dissolved. In the position, a flow path switching mechanism is provided.

In other words, when the ice is dissolved, the ice generated in the cooling space is easily dissolved, so that the high-temperature coolant is introduced toward the ice generated from the connection port (the ice-dissolving connection port) provided in the cooling space itself.

Further, when ice is generated, the low-temperature coolant is concentrated as much as possible in the vicinity of the evaporator in the cooling space to promote the cooling, so that the connection port for the cooling space provided in the liquid supply space or the liquid supply space (the connection port for ice generation) ) Introduce the coolant.

In the above invention, the control valves are respectively disposed on the flow paths after the branch flow paths are branched into the respective cooling groove connection flow paths, and the control valves have the function of the flow path switching mechanism.

Further, the control valve is provided on the side of the branch flow path which is branched before the respective cooling groove connecting flow paths, and a flow path switching mechanism for switching the flow paths is provided on each of the cooling groove connecting flow paths independently of the control valve.

(Embodiment 1)

Hereinafter, the temperature adjustment system of the molding die of the present invention will be described based on the examples shown in the drawings.

Figure 1 is a view showing the first temperature adjustment system of the molding die of the present invention. 2 is a block diagram of an embodiment. This temperature adjustment system includes a cooling tank 1 for accommodating a coolant and an adjustment tank 2 for accommodating a coolant from the cooling tank 1. The cooling tank 1 is composed of a cooling space 1a on the upstream side and a liquid supply space 1b on the downstream side. The upstream side of the cooling space 1a is closed by a wall, and the evaporator 8 of the cooling device 5 to be described later is disposed in the space. The liquid supply space 1b communicates with the downstream side of the cooling space 1a, and the cooling liquid cooled by the cooling space 1a is sent to the adjustment tank 2 through the liquid supply space 1b.

The cooling tank 1 and the adjustment tank 2 are integrally formed by two grooves divided by the partition wall 3, and the liquid level of the liquid supply space 1b of the cooling tank 1 is disposed above the liquid level of the adjustment tank 2, and the partition wall 3 of the cooling tank 1 is disposed. The upper edge is cut away to form an overflow port 4, and the component overflowing from the overflow port 4 flows into the adjustment tank 2.

Further, the temperature adjustment system of the present invention is provided with a cooling device 5 for cooling the coolant. This cooling device 5 is composed of a compressor 6 that compresses a refrigerant such as a chlorofluorocarbon, a condenser 7 that condenses the compressed refrigerant from the compressor 6, a solenoid evaporator (heat exchanger) 8, and a refrigerant circulating medium. The circuit 9 is configured such that the evaporator 8 is disposed inside the cooling space 1a of the cooling tank 1, and the coolant in the cooling tank 1 is directly cooled by heat exchange.

Further, the cooling device 5 is a heat pump type cooling device that uses the heat of evaporation of the refrigerant. This not only generates cold warm water in the peripheral portion of the coil of the evaporator 8 in the cooling bath 1, but can also be set to generate ice temperature.

Thereby, the latent heat of ice (dissolved heat) can be utilized to store a large amount of heat, that is, ice heat storage. As a result, the temperature of the coolant in the cooling bath 1 can be stably maintained at about 0 ° C, and the thermal efficiency can be improved. The cooling liquid in the cooling tank 1 is controlled by the temperature detected by the second temperature sensor 18 provided in the cooling tank 1, and the cooling device is controlled. 5 to maintain the temperature of the coolant in the cooling bath 1 constant.

The second temperature sensor 18 attached to the cooling tank 1 is preferably disposed at a position close to the surface of the solenoid of the evaporator 8 and the temperature sensing portion does not contact the solenoid. Specifically, it is preferable to provide the temperature sensing portion of the second temperature sensor 18 at a position away from the groove wall surface at a position of 1 cm to 10 cm, preferably 3 cm, from the surface of the solenoid of the evaporator 8. Moreover, it is preferable that the attachment position of the second temperature sensor 18 in the cooling space 1a is provided in the vicinity of the boundary between the cooling space 1a and the liquid supply space 1b. By ensuring the above-described mounting position, even if ice is generated on the surface of the solenoid of the evaporator 8 to maintain the water phase between the sensor temperature sensing portions, the second temperature sensor 18 detects the approximate freezing point temperature (0 ° C) and displays Therefore, ice can be continuously produced. The thickness of the ice grows, and after touching the temperature sensing portion of the sensor, the low temperature below the freezing point is detected. As a result, ice generation and growth can be monitored from the display temperature of the second temperature sensor 18.

Further, a cooling liquid circulation flow path 11 is returned from the adjustment tank 2 to the adjustment tank 2 through the pump 10 and the mold 10 of the plastic molding machine, and is branched from the circulation flow path 11 to the flow path of the mold 10, and then reaches the cooling tank 1 The split flow path 12 detects the first temperature sensor 15 that adjusts the temperature of the coolant in the tank 2. Further, a bypass flow path 14 that returns to the adjustment tank 2 after the pump P reaches the circulation flow path 11 of the mold 10 is provided, and a valve 16 is provided in the middle of the bypass flow path 14.

The control valve 13 provided in the branching flow path 12 is normally closed. When the detected temperature of the coolant in the adjustment tank 2 by the first temperature sensor 15 is equal to or higher than a predetermined cooling start set temperature set in advance, the control valve 13 is opened to cause the branching flow path 12 to reach the cooling tank 1 Open road, circulating flow path One of the coolants of 11 is returned to the cooling tank 1 via the branching flow path 12, and when the detected temperature is equal to or lower than the cooling start set temperature, the control valve 13 is closed to close the branching flow path 12 to the cooling tank 1. The means for controlling such settings can be easily performed by a computer equipped with a control program. Furthermore, it can also be implemented by a combination of electronic control units.

Further, the bypass flow path 14 is caused by a failure of the flow path of the mold 10 for some reason, and the coolant of the circulation flow path 11 is also flown to the adjustment tank 2, and the flow rate in the bypass flow path 14 is controlled by the valve 16. With proper adjustment, the valve 16 is closed without bypassing the flow path 14. Further, this bypass flow path 14 can also be omitted from the present system.

Further, the adjustment tank 2 is provided with a heater 17 that heats the adjustment tank 2 and the coolant in the coolant circulation flow path 11 when used in a high temperature range. When the heater 17 is required to cool the mold 10 with a coolant in a high temperature range of 50 ° C to 90 ° C, the heater 17 is set so that the detected temperature of the first temperature sensor 15 becomes a predetermined heating start set temperature. In the following, the conduction operation is performed, and when the temperature is equal to or higher than the set temperature, the opening operation is performed.

Further, in order to adjust the water level in the adjustment tank 2 to be constant, the coolant supply flow path 19 from the external cold water tower 23 is communicated through the float valve 20, and if the water level drops from the set value, the buoy 20a moves downward to float The valve 20 is opened to replenish the coolant from the cold water tower 23 to maintain the water level at a constant value.

Further, for the maintenance of the system and the cleaning of the cooling tank 1 or the adjustment tank 2, the return flow of the coolant in the system to the cold water tower 23 is connected to the cold water tower 23 from the way of the branch flow path 12, A valve 22 that opens and closes the return flow path 21 is provided in the middle of the flow path 21.

As the coolant used in the system, water is generally used, but an antifreeze or a liquid having the same physical properties in which an antifreeze such as ethylene glycol is mixed in water can be used.

In the above configuration, when the detection set temperature (cooling start set temperature) of the coolant circulating in the mold 10 is set to, for example, 40° C., the coolant in the adjustment tank 2 is circulated in the circulation flow path 11 by the pump P, and is cooled. Mold 10. At this stage, the coolant in the cooling bath 1 does not flow into the adjustment tank 2. Further, the heater 17 in the adjustment tank 2 is previously cut off from the power source.

When the coolant in the adjustment tank 2 that has flowed from the circulation flow path 11 absorbs the heat of the mold 10 and exceeds 40 ° C (cooling start set temperature), the temperature is detected by the first temperature sensor 15, and the control valve 13 is opened and reaches. The branching flow path 12 of the cooling tank 1 is opened, and one of the coolants having a high temperature of the circulating flow path 11 is returned to the cooling tank 1. Corresponding to the amount of liquid returned, the amount of liquid in the cooling tank 1 increases to raise the liquid level, overflows from the overflow port 4, and flows into the adjustment tank 2, thereby lowering the liquid temperature in the adjustment tank 2. When the coolant in the adjustment tank 2 becomes 40 ° C or lower, the first temperature sensor 15 detects that the branching flow path 12 reaching the cooling tank 1 is closed by the control valve 13. By repeating this operation, the temperature of the coolant flowing to the mold 10 can be automatically and automatically adjusted to 40 ° C of the set temperature (cooling start set temperature).

Further, the control valve 13 suppresses the inflow of the high-temperature circulating liquid from the mold 10 into the cooling bath 1, thereby suppressing an increase in the temperature of the coolant in the adjusting tank 2, and continuing the generation of ice in the cooling tank 1. With dissolved. Furthermore, the second temperature sensor 18 is disposed at a position away from the surface of the solenoid of the evaporator 8 and does not contact the wall surface of the groove, so as described above, in the second temperature sensor The temperature between the temperature sensing portions of the 18 is maintained below the freezing point, and the temperature of the cooling water in the cooling bath 1 can be accurately detected.

Further, in order to continuously generate ice in the cooling bath 1, the flow rate control of the temperature sensing portion of the second temperature sensor 18 and the flow rate of the coolant flowing into the cooling bath 1 from the branch flow path 12 are important factors.

According to the experiment of the present inventors, even if the coolant in the adjustment tank 2 becomes 40 ° C or lower, the control valve 13 is not completely closed, a small amount of coolant is set to flow, and the second temperature sensor 18 is set to evaporate. The surface of the solenoid of the device 8 is separated by about 3 cm, and is set to be turned on at a temperature of about 10 ° C or higher, preferably 5 ° C or higher, to maintain the generation of ice on the surface of the screw of the evaporator 8 . Moreover, the temperature of the cooling water inside the cooling bath 1 can be stably maintained at the set temperature.

Next, a case where the mold 10 is cooled by a coolant such as a polycarbonate resin in a high temperature range of, for example, 85 ° C will be described.

First, the power of the heater 17 is turned on, and the temperature at which the heater 17 is turned on (heating start set temperature) is set to 85 ° C, and the control valve 13 connected to the branch flow path 12 of the cooling bath 1 is opened. The temperature of the coolant (cooling start set temperature) is set to 85 ° C or higher, for example, 90 ° C.

Thereby, the coolant in the adjustment tank 2 that has flowed from the circulation flow path 11 is heated by the heater 17 to 90 ° C. When the temperature exceeds 90 ° C, the temperature is detected by the first temperature sensor 15, and the heater 17 switches. In the open state, the coolant is maintained at approximately 90 °C. When the coolant absorbs the heat from the mold 10 abnormally and rises more than 90 ° C (cooling start set temperature), the control valve 13 is opened, the flow path to the cooling tank 1 is opened, and one of the coolants having a high temperature of the circulation flow path 11 is returned. Return to the cooling tank 1. Corresponding to the amount of liquid returned, the amount of liquid in the cooling bath 1 increases to raise the liquid level, and overflows from the overflow port 4 into the adjustment tank 2 to lower the liquid temperature in the adjustment tank 2. When the temperature of the coolant in the adjustment tank 2 drops, the first temperature sensor detects that the branch flow path 12 reaching the cooling tank 1 is closed by the control valve 13. Thereby, it is possible to surely prevent the temperature of the coolant passing through the mold 10 from being separated from the temperature setting range.

As described above, in the present invention, by effectively utilizing the waste heat of the mold 10 and cooling by the cooling device 5, the temperature of the mold coolant can be energy-savingly in the low temperature range of about 10 ° C to about 50 ° C to 60 ° C. Domain acquired. Further, by using the heater 17 attached to the system, the temperature of the mold coolant can be raised to a high temperature of, for example, 90 ° C, and resin molding in a high temperature range like a polycarbonate resin can be performed. Thereby, the mold cooling temperature can be widely covered from the low temperature range to the high temperature range, and corresponds to various needs. Further, since the heater 17 is only required to be installed in the middle of the adjustment tank 2 or the circulation flow path 11, the configuration is simple and the cost can be reduced.

Further, in the present embodiment, the solenoid evaporator 8 of the cooling device 5 is disposed inside the cooling space 1a of the cooling tank 1 to directly cool the coolant, so that the evaporator 8 is hidden, and the appearance impression becomes fine, and compared with When the evaporator 8 is disposed outside the cooling tank 1, the line or pump for circulating the coolant can be omitted in the evaporator 8 and the cooling tank 1, and the configuration can be simplified. Further, by generating ice in the evaporator 8 in the cooling bath 1, a large amount of heat can be stored, and the thermal efficiency can be improved. Further, with respect to the cooling device 5, by setting a timer function for cooling at a predetermined time, ice can be generated in advance in the middle of the night when the electricity rate is low.

Figure 3 is a diagram showing the second temperature adjustment system of the molding die of the present invention. An illustration of an embodiment. In the second embodiment, the heater 17 is provided on the way from the mold 10 to the coolant circulation flow path 11 of the adjustment tank 2. In this case, since the heater 17 is outside the adjustment tank 2, maintenance of the heater 17 becomes easy.

(Experiment 1)

Table 1 below shows the test results of the cooling efficiency of the articles of the present invention, Comparative Products 1, Comparative Products 2, and Comparative Products 3.

Comparative product 1 is a commercially available mold cooling device that cools mold cooling water only by a refrigerator, Comparative product 2 is a mold cooling device having a mechanism of Patent Document 1, and Comparative product 3 is provided with a refrigerator and a heater and only uses cooling tank 1 The circulation path generates a mold cooling device for cold and warm water in a temperature range of 5 ° C to 90 ° C.

The numerical values in the table show the COP simple values measured based on the cooling capacity test method of JIS B 8613 "Ice Water Unit", which is obtained by the following formula.

COP value = cooling capacity (kcal) / power consumption (kWh)

In the test, the conversion was performed at 1 kWh = 860 kcal, and the mold cooling device was operated for about one hour, and the electric power required to generate the cooling water having a predetermined set temperature was measured and calculated by the above formula. It shows that the higher the COP value becomes, the higher the conversion efficiency of electric power → heat. According to the test, as shown in the following Table 1, it is understood that the product of the present invention is superior in conversion efficiency to any of the comparative products.

[Table 1]

(Embodiment 2)

Next, a temperature adjustment system according to another embodiment of the present invention will be described. In the second embodiment, the "ice generation mode" for actively generating ice and the "ice dissolution mode" for actively dissolving ice for power saving can be easily switched, for example, when the electricity rate is low, the cooling tank is used. In the ice generation mode, a large amount of ice is prepared in advance, and when the amount of electric power usage is peaked, the ice is dissolved in the "ice dissolution mode", whereby the amount of electric power used in the time zone can be easily suppressed, which is comparable to the first embodiment. Use ice heat storage more efficiently.

Fig. 4 is an explanatory view showing a third embodiment of the temperature adjustment system for the molding die of the present invention. In addition, the same components as those of the temperature adjustment system shown in FIG. 1 are denoted by the same reference numerals to omit one part of the description.

In the present embodiment, the branching flow path 12 that has branched from the cooling circuit flow path 11 to the flow path of the mold 10 and reaches the cooling groove 1 is further branched into the first cooling groove connecting flow path 31 at the end side of the branching flow path 12. The flow path 32 is connected to the second cooling bath. The first cooling tank connection flow path 31 is connected to the ice dissolution connection port 33 provided in the cooling space 1a of the cooling bath 1. It is preferable that the ice-dissolving connection port 33 is provided on the upstream side of the cooling space 1a as much as possible. In addition, the second cooling tank connection flow path 32 is connected to the ice generation connection port 34 provided in the cooling space 1a (or the liquid supply space 1b) provided in the vicinity of the liquid supply space 1b. In the above manner, the ice dissolution connection port 33 is provided on the upstream side of the ice generation connection port 34.

In the middle of the first cooling tank connecting flow path 31 branched from the branching flow path 12, the first control valve 35 for opening and closing control is provided, and similarly, the second cooling tank connecting flow after branching from the branching flow path 12 is provided. In the middle of the road 32, a second control valve 36 for opening and closing control is also provided.

A first temperature sensor 15 that detects the temperature of the coolant is provided in the adjustment tank 2.

The first control valve 35 and the second control valve 36 provided in the branch flow path 12 are normally closed. When the detected temperature of the coolant in the adjustment tank 2 by the first temperature sensor 15 is equal to or higher than a preset cooling start set temperature, the first control valve 35 or the second control valve 36 (or both) may be turned on. The flow path from the branching flow path 12 (through the first cooling tank connection flow path 31 or the second cooling tank connection flow path 32) to the cooling tank 1 is opened, and a part of the coolant of the circulation flow path 11 is returned through the branching flow path 12. Cooling tank 1. After the detected temperature of the first temperature sensor 15 is equal to or lower than the cooling start set temperature, it is turned on. The first control valve 35 or the second control valve 36 is closed, and the branching flow path 12 to the cooling tank 1 is closed. The means for controlling such settings can be easily performed by a computer equipped with a control program. Furthermore, it can also be implemented by a combination of electronic control units.

In the cooling space 1a of the cooling tank 1, the evaporator 8 is disposed inside the cooling tank 1, and the coolant in the cooling tank 1 is directly cooled by heat exchange, and the temperature at which ice can be generated can be maintained.

Further, in the present embodiment, in order to easily switch between the state in which ice is generated in the cooling bath 1 to promote ice heat storage (ice generation mode) and the state in which ice is accumulated (ice dissolution mode), the flow path will be from the circulation flow path. The flow rate of the high-temperature coolant of 11 from the branch flow path 12 to the cooling tank 1 is divided into a plurality of branches, and the introduction position of the coolant to the cooling tank 1 can be switched.

Specifically, the "ice generation mode" is selected by an input device (not shown) attached to a control means such as a computer or an electronic control unit to which the control program is attached, or the second control is simply controlled by manual operation. The opening and closing of the valve 36 acts as a control valve (the control valve 13 of Fig. 1) (the first control valve 35 is closed), and the "ice dissolution mode" is selected to control the opening and closing of the first control valve 35 as a control valve (second Control valve 36 is closed). In other words, the functions of the flow path switching mechanism of the first cooling tank connection flow path 31 and the second cooling water supply flow path 32 and the function of the control valve are switched by the first control valve 35 and the second control valve 36.

Next, the operation in each mode will be described. In the state in which the "ice generation mode" is selected, the detection temperature of the coolant in the adjustment tank 2 by the first temperature sensor 15 is equal to or higher than the preset cooling start setting temperature, and the second The control valve 36 is opened, and the flow path from the second cooling tank connection flow path 32 to the cooling water tank 1 is opened, and one of the coolant liquids in the circulation flow path 11 is returned to the cooling water tank 1 from the ice generation connection port 34. When the detected temperature is equal to or lower than the cooling start set temperature, the second control valve 36 is closed, and the branching flow path 12 to the cooling tank 1 is closed.

In this case, the coolant which has entered the cooling tank 1 at a high temperature from the ice generation connection port 34 contacts only the vicinity of the downstream side of the cooling space 1a, and is exchanged for heat to be sent to the liquid supply space 1b. Then, the coolant in the liquid supply space 1b flows into the adjustment tank 2, and the opening and closing of the second control valve 36 is controlled so that the temperature of the coolant in the adjustment tank 2 becomes the cooling start set temperature. At this time, a large amount of the coolant existing in the cooling space 1a is hardly affected by the high-temperature coolant entering from the ice generation connection port 34, and is continuously cooled by the evaporator 8 in a concentrated state, and is efficiently cooled to 0 ° C. The following to produce ice. At this time, the electric power consumed by the cooling device 5 becomes latent heat of ice, and is accumulated as cold heat energy.

In the state in which the "ice dissolution mode" is selected, the first control valve 35 is opened after the detection temperature of the coolant in the adjustment tank 2 by the first temperature sensor 15 is equal to or higher than the preset cooling start setting temperature. The flow path of the cooling tank connection flow path 31 to the cooling water tank 1 is opened, and one part of the coolant of the circulation flow path 11 is returned to the cooling tank 1 from the ice dissolution connection port 33. When the detected temperature is equal to or lower than the cooling start set temperature, the first control valve 35 is closed, and the branching flow path 12 to the cooling tank 1 is closed.

In this case, the high-temperature coolant that has entered the cooling tank 1 (which has been subjected to ice heat storage in the cooling space 1a) dissolves the ice accumulated in the cooling space 1a and simultaneously exchanges heat. Cooling with latent heat (dissolved heat) when ice is dissolved, so there is no need for a cooling device 5 Cooling can suppress power consumption. Then, since the coolant in the liquid supply space 1b flows into the cooling tank 2, the opening and closing of the first control valve 35 is controlled so that the temperature of the coolant in the adjustment tank 2 becomes the cooling start set temperature. Further, it is possible to save power while the accumulated ice is dissolved and simultaneously send the coolant to the adjustment tank 2.

Therefore, in the "ice generation mode", ice is generated in advance during the nighttime when the electricity cost is low, and the "ice dissolution mode" is used to save power and cool at the peak time of the daytime power usage, thereby reducing the power cost and realizing the power use. The power consumption of the peak time of the quantity.

Next, a modification will be described. Fig. 5 is an explanatory view showing a fourth embodiment. In addition, the same components as those of the temperature adjustment system shown in FIG. 4 are denoted by the same reference numerals to omit one part of the description.

In the present embodiment, the branching flow path 12 that has branched from the cooling circulation flow path 11 to the flow path of the mold 10 and reaches the cooling groove 1 is branched into the first cooling groove connecting flow path 41 at the end side of the branching flow path 12 and The second cooling bath is connected to the flow path 42. In the same manner as in the embodiment of FIG. 4, the first cooling-tank connection flow path 41 is connected to the ice-dissolving connection port 43 provided on the upstream side of the cooling space 1a of the cooling bath 1. The second cooling tank connection flow path 42 is connected to the ice generation connection port 44 provided on the downstream side of the cooling space 1a.

The control valve 13 is provided in the middle of the branching flow path 12, and the first cooling tank connecting flow path 41 and the second cooling water connecting flow path 42 are branched on the downstream side of the control valve 13. Further, a first switching valve 45 for switching the flow path is provided in the middle of the first cooling tank connection flow path 41, and a second switching for switching the flow path is also provided in the middle of the second cooling tank connection flow path 42. Valve 46. That is, in the present embodiment, the flow path switching machine is independently provided after the control valve 13 The first switching valve 45 and the second switching valve 46 are configured.

Next, when the "ice generation mode" is selected, the second switching valve 46 is opened, and the first switching valve 45 is closed. When the "ice dissolution mode" is selected, the first switching valve 45 is opened and the second switching valve 46 is closed.

Next, the operation in each mode will be described. When the "ice generation mode" is selected (the second switching valve 46 is in the open state), the detected temperature of the coolant in the adjustment tank 2 by the first temperature sensor 15 becomes a predetermined cooling start set temperature. After that, the control valve 13 is opened, and the flow path from the second cooling tank connection flow path 42 to the cooling tank 1 is opened, and one of the coolants of the circulation flow path 11 is returned to the cooling tank 1 from the ice generation connection port 44. When the detected temperature is equal to or lower than the cooling start set temperature, the control valve 13 is closed, and the branching flow path 12 to the cooling tank 1 is closed.

When the "ice dissolution mode" is selected (the first switching valve 45 is in the open state), the detection temperature of the coolant in the adjustment tank 2 by the first temperature sensor 15 becomes a predetermined cooling start set temperature. After that, the control valve 13 is opened, and the flow path from the first cooling tank connection passage 41 to the cooling tank 1 is opened, and one of the coolants of the circulation flow path 11 is returned to the cooling tank 1 from the ice dissolution connection port 43. When the detected temperature is equal to or lower than the cooling start set temperature, the control valve 13 is closed, and the branching flow path 12 to the cooling tank 1 is closed.

According to the above formula, even if the control valve 13 and the flow path switching mechanism (the first switching valve 45 and the second switching valve 46) are independently provided, the same control can be realized.

In the above embodiment, the flow path returning to the cooling tank 1 is completely switched to the first cooling tank connection flow path 41 and the second cooling groove connection flow path 42 by the "ice generation mode" and the "ice dissolution mode". But instead of this, pay The opening and closing of the first cooling tank connection flow path 41 and the second cooling water supply flow path 42 are switched between each other, and the ratio of the high-temperature coolant returning to the two flow paths may be changed. For example, in the "ice generation mode", the flow ratio of the first cooling tank connection passage 41 to the second cooling tank connection passage 42 is set to 9:1, and the "ice dissolution mode" is set to 1:9.

Further, in the above-described embodiments, the branch flow path is divided into two cooling groove connection flow paths, but the difference may be three or more. For example, three or more of the cooling space 1a are provided on the upstream side, the downstream side, and the center. The connection port is also available. Thereby, the amount of ice generated by the ice heat storage can be simply adjusted.

(Experiment 2)

Next, a verification experiment of ice heat storage in the temperature adjustment system of the second embodiment was carried out. In other words, the cold warm water set to a predetermined temperature is circulated in the mold while ice generation (ice heat storage) is performed, and then the cooling device 5 is stopped, and the mold temperature is adjusted by the ice heat storage. Explain the experimental and experimental results at this time.

Fig. 6 is an explanatory view showing a fifth embodiment of the mold temperature adjusting system of the present invention used in Experiment 2. The same components as those shown in FIGS. 4 and 5 are denoted by the same reference numerals to omit one part of the description.

In the fifth embodiment, the control valve 13 is provided in the middle of the branch flow path 12 of the cooling tank 1, and the end side of the branch flow path 12 is branched into the first cooling tank connection flow path 51 and the second cooling tank connection flow path 52. The four flow paths of the third cooling tank connection flow path 53 and the fourth cooling water supply flow path 54 are provided with a first switching valve 55, a second switching valve 56, a third switching valve 57, and a fourth switching valve 58, respectively. .

The first cooling tank connection flow path 51 is connected to the ice generation connection port 51a provided on the downstream side of the cooling space 1a of the cooling tank 1. 4th cooling tank connection The flow path 54 is connected to the ice dissolution connection port 54a provided on the upstream side of the cooling space 1a of the cooling bath 1. Further, the second cooling tank connection flow path 52 and the third cooling groove connection flow path 53 are connected to the intermediate connection ports 52a and 53a provided near the center of the cooling space 1a. The intermediate connection ports 52a and 53a are used when either ice is generated or ice is dissolved, and are also used for the connection port for ice generation and the connection port for ice dissolution.

As described above, the four switching valves of the first switching valve 55, the second switching valve 56, the third switching valve 57, and the fourth switching valve 58 are provided, and the flow velocity in the cooling space 1a of the cooling tank 1 can be adjusted. Further, each of the connection ports 51a to 54a may be attached to any portion of the side surface or the bottom surface of the cooling tank 1, but is attached to the side surface from the viewpoint of ease of maintenance and installation work.

In the experiment 2, the predetermined cold and warm water is sent to the mold 10 by adjusting the set temperature of the tank 2, and at the same time, the ice heat is stored in the cooling tank 1, and then the ice generated in the cooling tank 1 is dissolved and the energy is taken out. It is confirmed that the mold temperature adjustment is performed with a predetermined cold and warm water in a state where the cooling device 5 is continuously stopped.

In the ice generation and ice dissolution steps, the selection conditions for the warm cooling water to flow to the cooling tank 1 are important. Therefore, in the second experiment, a preferred method of using the utility mold temperature adjustment system for adjusting the switching valve is discussed.

In the second experiment, the temperature of the coolant sent to the mold 10 is determined by the set temperature of the first temperature sensor 15 provided in the adjustment tank 2, and the second temperature sensor 18 provided in the cooling tank 1 is used. The refrigeration cycle of the cooling device 5 is operated.

Operated as a general mold temperature adjustment system and simultaneously stored in ice The "ice generation operation" is performed after the flow path 12 is branched, and the first switching valve 55 is opened to close the other switching valves 56 to 58.

In the "icing operation" in which the ice is dissolved and the energy is taken out, the switching valves 56 to 58 are turned on to close the switching valve 55. Further, in a part of the comparative experimental example (Experiment No. 3), the switching valves 55, 58 were opened.

Further, for monitoring the operation state and monitoring of each part of the system configuration, a flow meter is provided in the mold flow path (cooling circulation flow path 11). Further, the liquid temperature of the coolant inlet to the mold 10 and the liquid return port from the mold to the adjustment tank 2 side were measured by a thermocouple. By monitoring the liquid temperature of the liquid inlet and the liquid return port of the mold 10, it is possible to determine the mold temperature adjustment or the uncontrollable condition under predetermined conditions. The results of the monitoring in Experiment 2 are shown once in Table 2 shown below.

In Table 2, under the conditions of Experiment No. 2, ice heat storage was simultaneously performed under normal operation of one hour (67 minutes), and after 51 minutes, the mold temperature adjustment was normally performed even if the cooling device was stopped. Thereby, it was confirmed that the ice heat storage in the mold temperature adjustment system of the present embodiment is effective.

Even under the conditions of Experiment No. 1, the ice heat storage can be realized under the normal operation of 180 minutes, and after 49 minutes, the mold temperature adjustment is normally performed even if the cooling device is stopped.

On the other hand, in Experiment No. 3, which was a comparative experiment, the energy of ice heat storage could not be sufficiently taken out. In No. 3, all of the ice could not be dissolved in the ice-dissolving process, but the reason was judged to be that the flow path of the cooling liquid was selected (the first switching valve 55 was opened when the ice was released).

Adjust the temperature: adjust the setting temperature of the tank 2 (the second temperature sensor setting temperature)

Cooling condition: Cooling machine 5 set temperature (1st temperature sensor set temperature)

Operation time: the time during which the ice heat storage is parallel to the mold temperature adjustment is separated from the time when the cooling machine of the refrigeration cycle is stopped and the cooling water is supplied according to the set temperature of the second temperature sensor. The longer the energy that can effectively use the energy of ice heat storage, the higher the effectiveness

Opening and closing of the connection port: indicating the opening and closing state of the connection ports 51, 52, 53, 54

○: open the bolt, ×: close

The amount of energy recovered: the amount of energy consumed by the mold is calculated from the temperature of the water supplied from the mold and the amount of water supplied.

Heat kcal=calculate the heat of movement for each hour by the flow rate of the mold into the coolant (mold return liquid temperature - mold inlet liquid temperature), and calculate the running time domain

Recycling heat ratio: The ratio of the amount of energy in the ice heat storage operation (general mold temperature control process) to the amount of energy used for temperature adjustment of the mold by thawing, the greater the ice storage capacity

The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and may be appropriately modified or changed without departing from the scope of the invention. Alternatively, instead of using a cooling machine of an external cold water tower, the cooling device shown in the explanatory diagram of each of the embodiments having the air-cooling type may be a cooling machine connected to the heat exchange unit of the external cold water tower 23. In the cooling machine, there is not only a cold water tower but also an air-cooled heat exchange unit Also appropriate.

Further, in each of the embodiments, the flow in the space is controlled by the selection of the flow path connected to the cooling space 1a in the cooling bath 1, but as a means for controlling the flow, for example, a small hole is formed in the bottom surface of the adjustment groove 2. The method of passing through the cooling bath 1 is also effective. In particular, it is convenient to make the two grooves into a communication structure during the water supply and the drainage at the time of maintenance of the cooling water for the daily mold temperature adjustment system.

Moreover, the configuration of the adjustment groove 2 is such that the partition wall 3 of the cooling tank 1 is divided into a partition plate and a bottom plate, and the position of the partition plate can be moved relative to the bottom plate. Thereby, the volume ratio of the adjustment tank 2 and the cooling tank 1 and the area of the partition wall 3 adjacent to the two grooves can be arbitrarily changed.

The present invention can be applied to a temperature adjustment system for a molding die of a plastic injection molding machine, and can be used as a temperature-regulating water generating device for air conditioning, for example, as a temperature adjustment for a living environment.

1‧‧‧Cooling trough

1a‧‧‧Upstream space

1b‧‧‧downside space

2‧‧‧Adjustment slot

3‧‧‧ partition wall

4‧‧‧Overflow

5‧‧‧Cooling device

8‧‧‧Evaporator

10‧‧‧Mold

11‧‧‧ Coolant circulation flow path

12‧‧‧Club flow path

13‧‧‧Control valve

14‧‧‧ bypass flow path

15‧‧‧1st temperature sensor

17‧‧‧heater

18‧‧‧2nd temperature sensor

31‧‧‧1st cooling tank connection flow path

32‧‧‧2nd cooling tank connection flow path

33‧‧‧Connecting port for ice dissolution

34‧‧‧Connecting port for ice generation

35‧‧‧1st control valve

36‧‧‧2nd control valve

P‧‧‧ pump

Fig. 1 is an explanatory view showing a first embodiment of a mold temperature adjusting system of the present invention.

Figure 2 is a block diagram of the first embodiment shown in Figure 1.

Fig. 3 is an explanatory view showing a second embodiment of the mold temperature adjusting system of the present invention.

Fig. 4 is an explanatory view showing a third embodiment of the mold temperature adjusting system of the present invention.

Figure 5 is a view showing a fourth embodiment of the mold temperature adjusting system of the present invention Description of the figure.

Fig. 6 is an explanatory view showing a fifth embodiment of the mold temperature adjusting system of the present invention.

1‧‧‧Cooling trough

1a‧‧‧Upstream space

1b‧‧‧downside space

2‧‧‧Adjustment slot

3‧‧‧ partition wall

4‧‧‧Overflow

5‧‧‧Cooling device

6‧‧‧Compressor

7‧‧‧Condenser

8‧‧‧Evaporator

9‧‧‧Refrigerant circulation loop

10‧‧‧Mold

11‧‧‧ Coolant circulation flow path

12‧‧‧Club flow path

13‧‧‧Control valve

14‧‧‧ bypass flow path

15‧‧‧1st temperature sensor

16‧‧‧ valve

17‧‧‧heater

18‧‧‧2nd temperature sensor

19‧‧‧ Coolant supply flow path

20‧‧‧Floating valve

20a‧‧‧ buoy

21‧‧‧Yuanyuan Road

22‧‧‧ Valve

23‧‧‧ Cold Water Tower

P‧‧‧ pump

Claims (5)

A temperature adjustment system for a molding die is composed of a cooling device having an evaporator capable of cooling a cooling liquid while cooling the cooling liquid to generate ice, and a cooling tank for conveying the cooling space on the upstream side and the downstream side The liquid space is connected to the space, the evaporator of the cooling device is disposed in the cooling space, and the coolant cooled by the evaporator is accommodated; the tank is adjusted to receive the coolant supplied from the liquid supply space of the cooling tank; The liquid circulation flow path is returned from the adjustment tank to the adjustment tank via the mold; the branch flow path is branched from the coolant circulation flow path and reaches the cooling space of the cooling tank; and the control valve is disposed on the way of the branch flow path a first temperature sensor for detecting a temperature of the coolant in the adjustment tank or the coolant circulation flow path; and a heater disposed in the adjustment tank or in the coolant circulation flow path, having a comparison 1 detecting temperature of the temperature sensor and a preset heating start setting temperature to control the function of the on/off action; the heater is detecting the temperature of the first temperature sensor to be heated When the first set temperature is equal to or lower than the set start temperature, the open operation is performed. When the detected temperature of the first temperature sensor reaches the preset cooling start set temperature or higher, the control valve is turned on to enable the control valve to be turned on. One part of the coolant of the high temperature of the coolant circulation flow path is returned to the cooling space of the cooling tank, and is equivalent to the cooling space returning to the cooling tank. a low-temperature coolant flows into the adjustment tank from the liquid supply space of the cooling tank; the cooling tank and the adjustment tank are formed by a partition body structure, and a boundary between a cooling space of the cooling tank and the liquid supply space a second temperature sensor for detecting the temperature of the coolant in the cooling tank is provided nearby, and the cooling device is controlled by the detected temperature of the second temperature sensor to control the temperature of the coolant in the cooling tank while Control the generation of ice within the cooling space. The temperature adjustment system of the molding die according to the first aspect of the invention, wherein the second temperature sensor provided in the cooling bath is disposed at a distance of 1 cm to 10 cm from the surface of the solenoid of the evaporator without contacting the groove wall surface. The location. The temperature adjustment system for forming a mold according to claim 1 or 2, wherein the end portion of the branch flow path is at least divided into two to form a plurality of cooling tank connection flow paths, and the cooling groove is connected to one of the flow paths. a connection port for ice dissolution provided in the cooling space, wherein one of the cooling channel connection flow paths is connected to an ice generation connection port provided in a cooling space in the vicinity of the liquid supply space or the liquid supply space; and the branch flow path is provided There is a flow path switching mechanism that switches the cooling tank connection flow path for conveying the high temperature coolant from the coolant circulation flow path. The temperature adjustment system for a molding die according to claim 3, wherein the control valve is respectively disposed on a flow path after the branch flow path is branched into a cooling groove connection flow path, and the control valve has the flow path switching The function of the institution. The temperature adjustment system for a molding die according to the third aspect of the invention, wherein the control valve is disposed on a side of the branch flow path before the cooling channel connection flow path, and is provided on each of the cooling groove connection flow paths. The flow path switching mechanism that switches the flow path differently from the control valve.