KR101606893B1 - Device for adjusting temperature of molding die - Google Patents

Abstract

In order to provide a mold temperature control device for a mold capable of stably using the mold temperature from the low temperature region to the high temperature region by using the waste heat of the mold and the cooling by the cooling device, A cooling liquid circulating flow path 11 and a branch flow path 12 branched from the circulation flow path 11 to the cooling tank 1 and a control valve 13 provided in the branch flow path 12 A temperature sensor 15 for detecting the temperature of the cooling liquid in the adjusting tank 2 or the circulating flow path 11 and a heater 17 provided in the adjusting tank 2 or in the circulating flow path 11, The control valve 13 is opened to return the high temperature cooling liquid of the circulation flow path 11 to the cooling bath 1 and the cooling bath 1 is returned to the cooling bath 1 by the amount of liquid returned to the cooling bath 1, (1) so that a low-temperature cooling liquid flows into the adjustment tank (2).

Description

TECHNICAL FIELD [0001] The present invention relates to a temperature adjusting device for a molding die,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a temperature control device for controlling a mold for molding a synthetic resin to a desired set temperature. In particular, the present invention relates to a mold temperature control apparatus for molding a mold, which can use a desired mold temperature over a wider temperature range by utilizing the waste heat of the mold and the cold heat generated by the cooling apparatus.

Conventionally, in plastic molding, a molten resin injected from a molding machine into a mold is cooled and solidified in a mold, cooled sufficiently before being taken out of the mold to produce a plastic molded article.

As means for cooling the mold, a method of circulating the cooling liquid cooled by the cooling device to the mold is employed. A temperature control is generally performed so that a circulating flow path for passing a cooling liquid through the inside of the mold is provided and the cooling temperature is maintained at a constant temperature so that the temperature of the mold is adapted to the molding temperature. The mold temperature is generally controlled within a range of 10 占 폚 to 30 占 폚 (hereinafter also referred to as "low temperature range") according to the heat distortion temperature of the resin to be molded.

However, in the case of a resin having a high heat distortion temperature, it is desired to keep the mold temperature at a temperature of room temperature or higher, for example, 40 to 60 占 폚 (hereinafter also referred to as "middle temperature range") as in EVA resin or ABS resin have. In this case, it is impossible to cope with the cooling system by only the cooling liquid circulation circuit as described above.

Therefore, the applicant of the present invention proposed a temperature control system for a mold for molding as shown in Patent Document 1. According to the present invention, by using the waste heat of the mold and the cooling by the cooling device, it is possible to save the energy of the desired mold temperature from 10 deg. C in the low temperature range to 60 deg.

Japanese Patent Publication No. 4755677

However, like polycarbonate resin, there is a case where it is desired to keep the mold temperature at a high temperature range of about 90 캜. In this case, it is difficult to keep the cooling liquid at 90 DEG C only by using the waste heat of the mold as described above.

Therefore, by using the waste heat of the metal mold and the cooling by the cooling device, it is possible to use a desired mold temperature from a low temperature region to a middle temperature region and also to use it stably over a high temperature range The present invention has as its main object to provide a temperature adjusting device for a molding die having a simple structure.

In addition, when the cooling device is used, electric power is consumed, and the electric power charge is set to be lower at nighttime in which the electric power consumption amount is smaller than the daytime in which the electric power usage amount becomes a peak. Therefore, there is a demand for a temperature adjusting device capable of regulating the temperature while conserving cold heat by generating cooling water by operating the cooling device at a low electric power charge at night, melting the ice at the peak of the power consumption during the day, , Researches have been made so far that it is easy to change the mode of use of the apparatus to the mode of generating ice efficiently or to change the mode to the power saving mode by efficiently using the generated ice in the conventional temperature adjusting apparatus . An object of the present invention is to provide a temperature adjusting device which can actively generate ice or actively melt ice while performing a temperature adjusting operation simply and efficiently.

In order to attain the above object, the present invention provides a temperature regulating apparatus for a mold for molding according to the present invention, comprising: a cooling tank for storing a cooling liquid cooled by a cooling device; a regulating tank for storing a cooling liquid from the cooling tank; A control valve provided in the middle of the branch flow path and a control valve provided in the middle of the branch flow path to control the temperature of the cooling liquid in the adjustment tank or the cooling liquid circulating flow path And a control unit that is provided in the control tank or in the cooling liquid circulating flow path and that performs ON / OFF operation by comparing the detected temperature of the first temperature sensor with a preset heating start set temperature And the heater is turned ON when the temperature is lower than the heating start set temperature And when the detected temperature of the first temperature sensor becomes equal to or higher than a predetermined cooling start set temperature, the control valve is opened so that a part of the high-temperature coolant in the coolant circulation channel is cooled And the low-temperature cooling liquid is introduced into the adjustment tank from the cooling tank by an amount of liquid returned to the cooling tank.

When the mold is cooled by the circulation of the cooling fluid in the adjustment tank separated from the cooling tank and the circulating cooling fluid rises above the predetermined cooling start set temperature according to the mold temperature according to the present invention, A part of the cooling liquid is returned to the cooling bath and the cooling liquid in the cooling bath is supplied to the adjusting bath from the cooling bath by the amount of the returned liquid so that the circulating cooling liquid in the adjusting bath can be automatically adjusted to the set temperature, And by cooling by the cooling device, the temperature of the mold cooling liquid can be obtained while saving energy from a low temperature range of about 10 ° C to a middle temperature range of about 60 ° C.

When resin molding at a temperature higher than 60 deg. C, specifically, about 90 deg. C, such as polycarbonate resin is required, a heater added to the system is used. This makes it possible to raise the temperature of the mold cooling liquid in the adjustment tank to a high temperature of, for example, 90 DEG C, and to use it even when resin molding is performed at a high temperature such as a polycarbonate resin. Further, since the heater only has to be attached in the middle of the adjusting tank or the circulating flow path, the heater is simple in structure, and the cost can be reduced.

In the above invention, the cooling tank and the adjusting tank are integrally formed by partition walls. The cooling tank is provided with a second temperature sensor for detecting the temperature of the cooling liquid in the cooling tank. The cooling device is controlled by the detected temperature , And the temperature of the cooling liquid in the cooling bath is kept constant.

By this two-tiered structure, the whole tank can be made compact and the installation space can be reduced, and the temperature of the cooling liquid in the cooling bath can be kept constant by the second temperature sensor, have.

In the above invention, it is preferable that an evaporator of a cooling device for cooling the cooling liquid is disposed in the cooling bath, and ice is generated in the cooling bath by the evaporator.

As a result, the evaporator is hidden to make the appearance image smarter, and the ice generated in the cooling bath can heat a large amount of cold heat, thereby improving the heat efficiency.

Here, in the above invention wherein the evaporator is disposed inside the cooling bath, the cooling bath has an upstream side as a closed end and communicates with the cooling space in which the evaporator is disposed and the downstream side of the cooling space, And a plurality of cooling bath connecting flow paths are formed, and one of the cooling bath connecting flow paths is connected to a freezing connection port provided in the cooling space And one of the cooling bath connecting channels is connected to an ice making connection port provided in a cooling space in the vicinity of the liquid-feeding space or the liquid-feeding space, and the cooling channel connecting channel for sending a high-temperature cooling liquid from the cooling- A flow path switching mechanism may be provided.

According to the present invention, the ice is produced in the cooling space in which the evaporator of the cooling bath is disposed, or the generated ice is melted. The position where the high-temperature cooling liquid from the branch passage is introduced into the cooling bath is defined as ice- A flow path switching mechanism is provided so as to be able to be changed at a time.

That is, at the time of ice melting, a high-temperature cooling liquid is introduced toward the ice generated from the connection port (ice-melting connection port) provided in the cooling space itself in order to easily melt the generated ice in the cooling space.

In order to accelerate the cooling due to the addition of a cooling liquid at a low temperature as near as possible to the evaporator of the cooling space during ice generation, the cooling water is supplied from a connection port (ice generating connection port) provided in a cooling space in the vicinity of the liquid- Coolant is introduced.

In the above-described invention, the control valve may be provided on each of the flow paths after the branch flow path is divided into the cooling bath connection flow paths, and the control valve may also function as the flow path switching mechanism.

In addition, the control valve may be provided on the upstream side of the branched flow path branched to each cooling flow connecting flow path, and a flow path switching mechanism for switching the flow path on the cooling flow connecting flow path may be provided separately from the control valve do.

1 is an explanatory view showing a first embodiment of a mold temperature adjusting apparatus according to the present invention;
2 is a block diagram of the first embodiment shown in Fig.
3 is an explanatory view showing a second embodiment of a mold temperature adjusting apparatus according to the present invention.
4 is an explanatory view showing a third embodiment of a mold temperature adjusting device according to the present invention.
5 is an explanatory view showing a fourth embodiment of the mold temperature adjusting device according to the present invention.
6 is an explanatory view showing a fifth embodiment of a mold temperature adjusting apparatus according to the present invention.

(Embodiment 1)

Hereinafter, a temperature adjusting apparatus for a molding die according to the present invention will be described on the basis of embodiments shown in the drawings.

Fig. 1 is an explanatory diagram showing a first embodiment of a temperature regulating apparatus for a molding die according to the present invention, and Fig. 2 is a block diagram thereof. This temperature adjusting device is provided with a cooling tank 1 for storing a cooling liquid and an adjusting tank 2 for storing a cooling liquid from the cooling tank 1. The cooling tank 1 comprises a cooling space 1a on the upstream side and a liquid-feeding space 1b on the downstream side. The upstream side of the cooling space 1a is closed by the wall, and the evaporator 8 of the cooling device 5, which will be described later, is arranged in the space. The liquid delivery space 1b communicates with the downstream side of the cooling space 1a and the cooling liquid cooled in the cooling space 1a is sent to the regulation tank 2 through the liquid delivery space 1b.

The cooling tank 1 and the adjustment tank 2 are formed in a two-unit structure separated from each other by a partition wall 3 so that the liquid level in the liquid delivery space 1b of the cooling tank 1 is higher than the liquid level of the adjustment tank 2 And the upper edge of the partition 3 of the cooling tank 1 is cut off to form an overflow port 4. The overflow port 4 is provided so as to flow into the control tank 2 as much as it overflows from the overflow port 4. [ .

Further, in the temperature adjusting apparatus of the present invention, a cooling device 5 for cooling the cooling liquid is provided. The cooling device 5 includes a compressor 6 for compressing refrigerant such as Freon, a condenser 7 for condensing the compressed refrigerant from the compressor 6, an evaporator evaporator (heat exchanger) 8, The evaporator 8 is disposed inside the cooling space 1a of the cooling bath 1 and is used for exchanging the cooling liquid in the cooling bath 1 by heat exchange As shown in Fig.

The cooling device 5 is a heat pump-type cooling device that uses the heat of evaporation of the refrigerant. This is configured so as not only to generate cold and hot water in the peripheral portion of the pipe of the evaporator 8 in the cooling bath 1 but also to set a temperature at which ice can be generated.

As a result, it is possible to store a large amount of cold heat by using latent heat (heat of fusion) of ice, that is, to enable ice storage heat. As a result, the temperature of the cooling liquid in the cooling bath 1 can be kept stable at approximately 0 占 폚, and the heat efficiency can be increased. The cooling liquid in the cooling tank 1 is controlled by the cooling device 5 by the detected temperature by the second temperature sensor 18 provided in the cooling tank 1 so that the temperature of the cooling liquid in the cooling tank 1 is kept constant Respectively.

It is preferable that the second temperature sensor 18 mounted on the cooling bath 1 is located at a position close to the bare tube surface of the evaporator 8 and the temperature sensitive portion does not contact the bare tube. More specifically, it is preferable to provide a temperature sensing portion of the temperature sensor at a position that is not in contact with the cooling bath wall surface at a position of 1 cm to 10 cm, preferably 3 cm away from the bare tube surface of the evaporator 8. The attachment position of the second temperature sensor 18 in the cooling space 1 is preferably provided in the vicinity of the boundary between the cooling space 1a and the liquid supply space 1b. By securing such an attaching position, while the ice is generated on the bare tube surface, the second temperature sensor detects and displays the freezing point temperature (0 ° C) while the sensor is warmed around the warming portion, . Ice grows to increase the thickness, and when it comes into contact with the sensor, it detects low temperature below freezing point. As a result, ice production and its growth can be monitored from the display temperature of the second temperature sensor.

The coolant circulating flow path 11 which passes from the adjustment tank 2 through the pump P and the metal mold 10 of the plastic molding machine and returns to the regulating tank 2 and the coolant circulating flow path 11 returning to the mold 10 of the circulating flow path 11 A branching flow path 12 branched from the flow path to the cooling tank 1 and a first temperature sensor 15 for detecting the temperature of the cooling liquid in the adjustment tank 2 are provided. A bypass flow path 14 branched from the middle of the circulation flow path 11 from the pump P to the mold 10 and returning to the adjustment tank 2 is provided. (16).

The control valve 13 provided on the branch flow path 12 is normally closed. When the temperature detected by the first temperature sensor 15 is equal to or higher than a preset desired cooling start set temperature, the control valve 13 is opened to cool the cooling bath 1 of the branch passage 12, A part of the cooling liquid of the circulating flow path 11 is returned to the cooling bath 1 through the branch flow path 12 and the control valve 13 And is closed so that the branching flow path 12 to the cooling bath 1 is closed. The means for controlling such setting can be easily performed by the computer incorporating the control program. It can also be implemented by a combination of electronic control units.

The bypass flow passage 14 is for returning the cooling fluid of the circulation flow passage 11 to the adjustment tank 2 when a trouble occurs in the flow passage in the mold 10 for some reason, The flow rate is appropriately adjusted by the valve 16, and when the bypass is not required, the valve 16 is closed. The bypass passage 14 may be omitted from the present system.

In the adjusting tank 2, a heater 17 for heating the cooling liquid in the adjusting tank 2 and the cooling liquid circulating flow path 11 is provided at the time of use at a high temperature. The heater 17 operates when the mold 10 needs to be cooled by a cooling liquid at a high temperature of 50 to 90 DEG C and is operated when the detected temperature of the first temperature sensor 15 reaches a predetermined heating start It is ON when it is below the set temperature and OFF when it is above the set temperature.

In order to adjust the water level in the regulating tank 2 to a constant level, the cooling liquid supply passage 19 from the cold water column 23 provided outside is communicated with the float valve 20, The float float 20a moves downward to open the float valve 20 and replenishes the cooling liquid from the cold water column 23 to maintain the water level at a constant value.

A reducing flow path 21 for returning the cooling liquid in the system to the cold water column 23 is provided from the midpoint of the branch flow path 12 to the cold water tower 23 for cleaning the cooling system 1 and the adjustment tank 2, And a valve 22 for opening and closing the reducing flow path 21 is provided in the middle of the reducing flow path 21.

As the cooling liquid used in the present system, water is usually used, but it is possible to use an antifreeze liquid in which an antifreezing agent such as ethylene glycol is mixed in water or a liquid having equivalent physical properties.

When the detection set temperature (cooling start set temperature) of the cooling liquid circulating through the metal mold 10 is driven to be set at, for example, 40 DEG C, the cooling liquid in the adjustment tank 2 is supplied to the pump P Circulates the circulating flow path 11 and cools the metal mold 10. [ At this stage, the cooling liquid in the cooling tank 1 is not introduced into the adjustment tank 2. [ In addition, the heater 17 in the adjustment tank 2 is turned off.

The temperature is detected by the first temperature sensor 15 when the cooling liquid in the adjustment tank 2 that is refluxed from the circulating flow path 11 absorbs the heat of the mold 10 and exceeds 40 占 폚 The branching flow path 12 leading to the cooling bath 1 is opened and part of the cooling fluid having a high temperature of the circulation flow path 11 is returned to the cooling bath 1. The amount of the liquid in the cooling bath 1 increases by the amount of the returned liquid so that the liquid surface rises and overflows from the overflow port 4 and flows into the adjustment tank 2 to lower the liquid temperature in the adjustment tank 2. [ When the temperature of the cooling liquid in the adjusting tank 2 becomes 40 DEG C or lower, the first temperature sensor 15 detects the closing of the branching flow path 12 reaching the cooling tank 1 by the control valve 13. [ By repeating this operation, the temperature of the cooling liquid flowing through the mold 10 can be automatically adjusted to 40 ° C, which is always the set temperature (cooling start set temperature).

The control valve 13 suppresses the inflow of the high-temperature reflux liquid from the mold 10 into the cooling bath 1, thereby suppressing an increase in the temperature of the cooling liquid in the adjustment tank 2, The generation and melting of ice in the ice making chamber 1 can be continued. Since the second temperature sensor 18 is disposed at a position away from the bare tube surface of the evaporator 8 and does not contact the wall surface of the cooling vessel, as long as the periphery of the warm- The temperature of the cooling water in the cooling bath 1 can be accurately detected.

In order to generate ice continuously in the cooling bath 1, the attachment position of the warmed portion of the second temperature sensor 18 and the flow rate control of the cooling liquid flowing into the cooling bath 1 from the branch flow channel 12 It becomes an important factor.

According to the experiment of the inventor of the present invention, the control valve 13 is not closed completely even when the cooling liquid in the adjustment tank 2 is 40 ° C or lower, but a small amount of cooling liquid is set to flow, It is preferable that the cooling water temperature is set to be about 10 캜 or more, preferably 5 캜 or more, to be ON at a position about 3 cm from the bore surface of the baffle 8, The temperature of the cooling water in the cooling bath 1 can be kept stable at the set temperature.

Next, a description will be given of a case where the mold 10 is cooled by, for example, a cooling liquid at a high temperature of 85 占 폚, such as a polycarbonate resin.

First, the power supply of the heater 17 is turned on and the temperature (heating start set temperature) at which the heater 17 is turned ON is set to 85 DEG C and the control valve (not shown) (Cooling start set temperature) for performing the opening operation of the cooling fluid 13 is set to 85 deg. C or more, for example, 90 deg.

Thus, the cooling liquid in the regulation tank 2, which is refluxed from the circulating flow path 11, is heated to 90 占 폚 by the heater 17. When the temperature exceeds 90 占 폚, the temperature is detected by the first temperature sensor 15, (17) is turned OFF, and the cooling liquid is maintained at approximately 90 deg. The control valve 13 is opened to open the flow path leading to the cooling bath 1 and the temperature of the circulation flow path 11 is raised to the temperature A part of the cooling liquid having a high temperature is returned to the cooling bath 1. The amount of the liquid in the cooling bath 1 increases by the amount of the returned liquid so that the liquid surface rises and overflows from the overflow port 4 and flows into the adjustment tank 2 to lower the liquid temperature in the adjustment tank 2. [ The first temperature sensor 15 detects the temperature of the cooling liquid in the adjusting tank 2 and the branching flow path 12 reaching the cooling tank 1 by the control valve 13 is closed. This makes it possible to reliably prevent the temperature of the cooling liquid passing through the mold 10 from deviating from the set temperature range.

As described above, in the present invention, by effectively utilizing the waste heat of the mold 10 and by cooling the mold 5 by cooling, the temperature of the mold cooling liquid is reduced from a low temperature range of about 10 DEG C to a middle temperature range of about 50 DEG C to 60 DEG C Can be obtained by saving energy up to. Further, by using the heater 17 added to the system, the temperature of the mold cooling liquid can be raised to a high temperature of, for example, 90 DEG C, and resin molding can be performed at a high temperature such as a polycarbonate resin. As a result, it is possible to cover the mold cooling temperature from the low temperature region to the high temperature region in a wide range, thereby coping with various demands. In addition, since the heater 17 only needs to be attached in the middle of the adjusting tank 2 or the circulating flow path 11, the configuration is simple and the cost can be reduced.

In this embodiment, since the cooling liquid is directly cooled by arranging the tubular evaporator 8 of the cooling device 5 inside the cooling space 1a of the cooling bath 1, the evaporator 8 The evaporator 8 and the cooling bath 1 are provided with a pipe line for circulating the cooling liquid to the outside of the cooling bath 1 The pump can be omitted, and the configuration can be simplified. In addition, by generating ice in the evaporator 8 in the cooling tank 1, a large amount of cold heat can be stored, and heat efficiency can be increased. In addition, by providing the cooling device 5 with a timer function for cooling at the reserved time, it is possible to generate ice in the middle of the night when the electric bill is cheap.

Fig. 3 is an explanatory view showing a second embodiment of the temperature adjusting device for a molding die according to the present invention. In the second embodiment, the heater 17 is installed in the middle of the cooling liquid circulating flow path 11 from the mold 10 to the adjustment tank 2. [ In this case, since the heater 17 is outside the adjustment tank 2, the maintenance of the heater 17 is facilitated.

(Experiment 1)

Table 1 below shows the test results of the cooling efficiency by the product of the present invention and the comparative article 1, the comparative article 2 and the comparative article 3.

The comparative article 1 is a mold cooling apparatus for cooling the mold cooling water only by a freezer. The comparative article 2 is a mold cooling apparatus having a mechanism of the patent document 1. The comparative article 3 includes a freezer and a heater, It is a mold cooling device that generates cold and hot water in a temperature range of 5 ° C to 90 ° C in the circulation path of the atmosphere.

The water level in the table represents the COP simple value measured in accordance with the cooling capacity test method of Annex 1 of JIS B 8613 "Water chiller unit", and the COP value is obtained by the following calculation formula.

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

In the test, the power required to generate cooling water at a predetermined set temperature was measured by operating the mold cooling apparatus for 1 hour in terms of 1 kWh = 860 kcal, and calculated by the above formula. The larger the COP value, the higher the conversion efficiency of power → heat quantity. According to this test, as shown in the following Table 1, it can be seen that the embodiment of the present invention has higher conversion efficiency than any of the comparative products.

[Table 1]

Note: × temperature is not adjustable (does not reach high temperature range)

? Indicates unstable temperature regulation (difficult to maintain high temperature)

(Embodiment 2)

Next, a temperature adjusting apparatus according to another embodiment of the present invention will be described. In Embodiment 2 described here, it is possible to easily switch between the " ice generation mode " for positively generating ice and the " ice melting mode " for aggressively melting ice for power saving, A large amount of ice is produced in the " ice generation mode " in the cooling bath in the time zone, and the ice is melted in the " ice melting mode " , So that the ice storage heat can be used more efficiently than in the first embodiment.

4 is an explanatory diagram showing a third embodiment of a temperature adjusting apparatus for a molding die according to the present invention. The same components as those of the temperature adjusting device shown in Fig. 1 are denoted by the same reference numerals, and a description thereof will be omitted.

The branched flow path 12 that branches from the flow path leading to the mold 10 of the coolant circulation flow path 11 to the cooling bath 1 is further branched from the end side of the branch flow path 12 to the first And is branched into the cooling bath connecting flow path 31 and the second cooling bath connecting flow path 32. The first cooling bath connection flow path 31 is connected to the ice-making connection port 33 provided in the cooling space 1a of the cooling bath 1. It is preferable that the ice-making connection port 33 is provided on the upstream side of the cooling space 1a as much as possible. The second cooling bath connection flow path 32 is connected to the ice making connection port 34 provided in the cooling space 1a (or the liquid supply space 1b) in the vicinity of the liquid supply space 1b. In this way, the ice-making connection port 33 is provided on the upstream side of the ice-making connection port 34.

A first control valve 35 for performing opening and closing control is provided in the middle of the first cooling bath connection flow path 31 after branching from the branch flow path 12 and similarly a second control valve 35 for branching from the branch flow path 12 And a second control valve 36 for performing opening and closing control is provided in the middle of the coarse connecting flow path 32 as well.

In the adjustment tank 2, a first temperature sensor 15 for detecting the temperature of the cooling liquid is provided.

The first control valve 35 and the second control valve 36 provided on the branch flow path 12 are normally closed. The first control valve 35 or the second control valve 36 (or the second control valve 36) is opened when the detection temperature of the cooling liquid in the adjustment tank 2 by the first temperature sensor 15 is equal to or higher than a predetermined cooling start set temperature The flow path from the branching flow path 12 to the cooling tank 1 is opened from the first cooling bath connecting flow path 31 or the second cooling bath connecting flow path 32, A part of the cooling liquid in the cooling chamber 11 is returned to the cooling tank 1 via the branch flow path 12. The first control valve 35 or the second control valve 36 which has been opened is closed and the branched flow path 12 to the cooling tank 1 is closed Is closed. The means for controlling such setting can be easily performed by the computer incorporating the control program. It can also be implemented by a combination of electronic control units.

In the cooling space 1a of the cooling bath 1, the evaporator 8 is disposed inside the cooling bath 1 to directly cool the cooling liquid in the cooling bath 1 by heat exchange, So that the temperature can be maintained.

In this embodiment, in order to easily switch between a state (ice generation mode) in which ice is generated in the cooling tank 1 to accelerate the ice storage heat and a state in which the accumulated ice is melted (ice melting mode) A plurality of flow paths for returning the high-temperature cooling fluid from the flow path 11 to the cooling bath 1 from the branch flow path 12 are branched so that the introduction position of the cooling fluid into the cooling bath can be switched. More specifically, by selecting the " ice generating mode " by an input from an input device (not shown) attached to a control means such as a computer or an electronic control unit incorporating the control program described above, (The first control valve 35 is closed) by selecting the " ice melting mode ", the second control valve 36 is controlled to open and close to function as the control valve 1 control valve 35 is controlled to open and close to function as a control valve (the second control valve 36 is closed). That is, the first control valve 35 and the second control valve 36 function as a flow path switching mechanism for switching the first cooling bath connecting flow path 31 and the second cooling bath connecting flow path 32, And the like.

Next, the operation in each mode will be described. When the temperature detected by the first temperature sensor 15 is equal to or higher than a predetermined cooling start set temperature in the state in which the "ice producing mode" is selected, the second control valve 36, The flow path from the second cooling bath connecting flow path 32 to the cooling bath 1 is opened and a part of the cooling liquid in the circulating flow path 11 is returned from the ice producing connection port 34 to the cooling bath 1 . When the detected temperature becomes the cooling start set temperature or lower, the second control valve 36 is closed and the branch flow path 12 to the cooling bath 1 is closed.

In this case, the high-temperature cooling liquid that has entered the cooling bath 1 through the ice-producing connection port 34 contacts only the vicinity of the downstream side of the cooling space 1a and is heat-exchanged and sent to the liquid-feeding space 1b. The cooling liquid in the liquid feed space 1b flows into the adjustment tank 2 and the second control valve 36 is controlled so that the temperature of the cooling liquid in the adjustment tank 2 becomes the cooling start set temperature. A large amount of cooling liquid present in the cooling space 1a at this time is hardly influenced by the high temperature cooling liquid which has entered from the ice producing connection port 34 and is continuously cooled by the evaporator 8 in a state of being in a dead state, It is cooled down to 0 ° C or lower and ice is generated. At this time, the electric power consumed in the cooling device 5 becomes latent heat of the ice and is accumulated as the cold energy.

When the detection temperature of the cooling liquid in the control tank 2 by the first temperature sensor 15 becomes equal to or higher than a predetermined cooling start set temperature in the state where the " ice melting mode " is selected, The flow path from the first cooling bath connecting flow path 31 to the cooling bath 1 is opened and a part of the cooling fluid in the circulating flow path 11 is returned from the ice fusing connection port 33 to the cooling bath 1 . When the detected temperature becomes equal to or lower than the cooling start set temperature, the first control valve 35 is closed and the branch flow path 12 to the cooling tank 1 is closed.

In this case, the high-temperature cooling liquid entering the cooling bath 1 is heat-exchanged while melting the ice accumulated in the cooling space 1a (since the ice storage heat is already formed in the cooling space 1a). It is possible to cool by using the latent heat (heat of fusion) when the ice melts, so that it is not necessary to cool it by the cooling device 5, and power consumption can be suppressed. The first control valve 35 is opened and closed so that the temperature of the cooling liquid in the adjustment tank 2 becomes the cooling start set temperature since the cooling liquid in the liquid feed space 1b flows into the adjustment tank 2. [ Then, the cooling liquid can be sent to the regulating tank 2 while saving power until the accumulated ice melts.

Therefore, it is possible to reduce the electric power cost by generating ice in the " ice generation mode " at a time when the electricity charge at night is cheap and by cooling while conserving electricity in the " ice melting mode " It is possible to realize power saving at peak usage amount.

Next, a modified example will be described. 5 is an explanatory view showing the fourth embodiment. The same constituent parts of the temperature adjusting device shown in Fig. 4 are denoted by the same reference numerals, and a part of the explanation will be omitted.

The branching flow path 12 that branches from the flow path leading to the mold 10 of the coolant circulating flow path 11 to the cooling bath 1 is branched from the end side of the branch flow path 12 to the first cooling flow path 12, And branches to the connection flow path 41 and the second cooling bath connection flow path 42. 4, the first cooling bath connection passage 41 is connected to the ice-making connection port 43 provided on the upstream side of the cooling space 1a of the cooling bath 1. The second cooling bath connection flow path 42 is connected to the ice making connection port 44 provided on the downstream side of the cooling space 1a.

A control valve 13 is provided in the middle of the branch flow path 12 and branches to the first cooling bath connection flow path 41 and the second cooling bath connection flow path 42 on the downstream side of the control valve 13. [ In the middle of the first cooling bath connection flow passage 41, there is provided a first switching valve 45 for switching the flow passage, and a second switching valve 45 for switching the flow passage in the middle of the second cooling bath connection flow passage 42 And a control valve 46 are respectively installed. That is, in the present embodiment, the first switch valve 45 and the second switch valve 46, which serve as a flow path switching mechanism, are separately provided at the rear end of the control valve 13.

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 melting 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. (The second switching valve 46 is opened), the detection temperature of the cooling liquid in the adjustment tank 2 by the first temperature sensor 15 is set to the predetermined desired cooling start The control valve 13 is opened to open the flow path from the second cooling bath connection flow path 42 to the cooling bath 1 and a part of the cooling fluid in the circulation flow path 11 is supplied to the ice producing connection port 44 to the cooling bath 1. When the detected temperature becomes the cooling start set temperature or lower, the control valve 13 is closed and the branch flow path 12 to the cooling bath 1 is closed.

(The first switching valve 45 is opened), the detection temperature of the cooling liquid in the control tank 2 by the first temperature sensor 15 is set to the predetermined cooling start setting The control valve 13 is opened to open the flow path from the first cooling bath connecting flow path 41 to the cooling bath 1 and a part of the cooling liquid in the circulating flow path 11 is connected to the ice fusing connection port 43 ) To the cooling bath (1). When the detected temperature becomes the cooling start set temperature or lower, the control valve 13 is closed and the branch flow path 12 to the cooling bath 1 is closed.

In this way, even if the control valve 13 and the flow path switching mechanisms (the first switching valve 45 and the second switching valve 46) are provided separately, the same control can be realized.

In the above-described embodiment, the flow path for returning to the cooling bath 1 is set to the first cooling bath connecting flow path 41 and the second cooling bath connecting flow path 42 by the "ice generating mode" and the " The opening of the first cooling bath connecting flow path 41 and the opening of the second cooling bath connecting flow path 42 are alternately switched so that the ratio of the high temperature cooling liquid returned to the two flow paths is changed to . For example, in the "ice producing mode", the flow rate ratio of the first cooling bath connecting flow path 41 and the second cooling bath connecting flow path 42 may be set to 9: 1 and 1: 9 in the "ice melting mode".

In each of the above-described embodiments, the branching flow path is branched into two cooling connection flow paths, but branched into three or more, for example, at three positions upstream, downstream, and the center of the cooling space 1a. . This makes it easy to adjust the amount of ice produced by the ice storage heat.

(Experiment 2)

Next, a verification experiment of ice storage heat in the temperature adjusting device of the second embodiment was performed. That is, while the cold and hot fresh water set at the predetermined temperature was circulated to the mold, ice production (ice storage heat) was performed in parallel, and then the cooling device 5 was stopped to adjust the mold temperature using the ice storage heat. The experimental and experimental results at that time will be described.

6 is an explanatory diagram showing a fifth embodiment of the mold temperature adjusting apparatus according to the present invention used in Experiment 2. The same functional parts as those shown in Figs. 4 and 5 are denoted by the same reference numerals, and a part of the explanation is omitted.

In the fifth embodiment, the control valve 13 is provided in the middle of the branch flow path 12 to the cooling tank 1 and the distal end side of the branch flow path 12 is connected to the first cooling bath connection flow path 51, The third cooling bath connecting flow passage 53 and the fourth cooling bath connecting flow passage 54. The first switching valve 55 and the second switching valve 56 A third switching valve 57, and a fourth switching valve 58 are provided.

The first cooling bath connecting flow passage 51 is connected to the ice making connection port 51a provided on the downstream side in the cooling space 1a of the cooling tank 1. [ The fourth cooling bath connection flow passage 54 is connected to the ice-making connection port 54 provided on the upstream side in the cooling space 1a of the cooling tank 1. The second cooling bath connection passage 52 and the third cooling bath connection passage 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 for a connection port for ice generation and a connection port for ice melting depending on whether the intermediate connection ports 52a and 53a are used at the time of ice generation or at the time of ice fusion.

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 cooling of the cooling bath 1 So that the flow rate in the space 1a can be adjusted. Each of the connection ports 51a to 54a can be attached to any part of the side surface or the bottom surface of the cooling bath 1 and is attached to the side surface from the ease of maintenance and attachment work.

In Experiment 2, ice cooling heat is performed in the cooling bath while the predetermined cold / hot fresh water is sent out to the mold according to the set temperature of the adjustment tank 2, and then the ice produced in the cooling bath 1 is melted to extract cold heat , While the cooling apparatus was stopped, suitable conditions for realizing the mold temperature control with a predetermined cold and hot fresh water were confirmed.

In the ice production and the ice melting process, the selection condition of the connection port for refluxing the cooling water heated by the cooling tank 1 is important. In Experiment 2, therefore, a suitable method of using a mold as a mold temperature adjusting device by adjusting a switch valve was examined.

The second temperature sensor 18 provided in the cooling bath 1 determines the temperature of the cooling liquid to be sent to the mold 10 at the set temperature of the first temperature sensor 15 provided in the adjustment tank 2, The refrigeration cycle of the cooling device 5 was activated.

In the " ice producing operation " for ice-cooling heat while operating as a normal mold temperature adjusting device, the first switch valve 51 is opened after the branch flow passage 12, and the other switch valves 52 to 54 are closed.

In the " sea ice operation " where the ice is melted and the cold is taken out, the switching valves 52 to 54 are opened and the switching valve 51 is closed. In some comparative experiments (Experiment No. 3), the switching valves 54 and 51 were opened.

Further, a flow meter was provided in the mold flow path 11 (coolant circulation flow path) for monitoring the operation status and monitoring each part of the present system configuration. The liquid temperature at the liquid inlet to the mold 10 and the liquid delivery port from the mold to the adjustment tank 2 side was measured at the thermocouple. By monitoring the liquid temperature of the mold inlet and the delivery port, it was possible to determine whether the mold temperature adjustment was realized under predetermined conditions or whether the control was disabled. The monitoring results in Experiment 2 are collectively shown in Table 2 shown below.

In Table 2, in the condition of Experiment No. 2, the ice storage heat was realized in parallel under normal operation in a little over 1 hour (67 minutes), and the mold temperature was adjusted normally even after stopping the cooling device for 51 minutes . Thus, it was confirmed that the ice storage temperature in the mold temperature adjusting apparatus of the present embodiment was effective.

Even under the condition of Experiment No. 1, the ice storage heat could be realized under the normal operation for 180 minutes, and the mold temperature was regulated normally even if the cooling device was stopped for 49 minutes thereafter.

On the other hand, in Experiment No. 3 as a comparative experiment, the cold heat of ice-cooling was not sufficiently extracted. In No.3, all ice was not melted during the sea ice process, which was determined to be inadequate for the choice of channel for the coolant (opening throttling valve (51) during thawing).

[Table 2]

Summary Table of Embodiments

Adjustment temperature: Adjusting tank (2) Setting temperature (second temperature sensor setting temperature)

Cooling condition: Cooling device (5) Setting temperature (first temperature sensor setting temperature)

Operation time: Time in which the cooling water was supplied in accordance with the set temperature of the second temperature sensor after stopping the cooling device of the refrigeration cycle and the time in which the ice storage heat and the mold temperature control were simultaneously operated was divided.

The longer the effective use of ice cold heat is, the more effective it is.

Connection opening and closing: It shows the opening and closing states of the connection ports 51, 52, 53 and 54.

O: Open, X: Closed

The amount of heat recovered: the amount of heat that was consumed in the mold was calculated from the temperature of the mold transfer fluid and the quantity of water transferred.

Calories kcal = Mold inflow cooling fluid flow rate × (Mold transfer fluid temperature - Mold inflow fluid temperature)

The amount of heat of movement for each hour was calculated, and the operating time period was integrated.

Ratio of recovered heat quantity: It was judged that the larger the ratio of the amount of the heat of the cold that was available for controlling the mold temperature by the thawing of the amount of the cold in the ice storage heat operation (the normal mold temperature control process), the better the ice storage capacity.

While the present invention has been described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the specific embodiments thereof, but may be modified and changed without departing from the scope of the present invention. It is possible. The cooling device shown in the block diagram of each embodiment shows the connection with the external cold water column, but a cooling device provided with an air-cooled heat exchange unit may be arranged instead of the cooling device using the external cold water column. The cooling device may include a cold water column as well as an air-cooled heat exchange unit.

In each of the embodiments, the liquid flow in the space is controlled by selecting the flow path connected to the cooling space 1a in the cooling tank 1. As a liquid flow control means, for example, It is also effective to drill a small hole in the surface and let it pass through the cooling bath. Particularly, it is convenient to make both chambers have a communication structure at the time of water supply and drainage when maintenance of the cooling water of the everyday mold temperature adjusting device is performed.

Further, the adjustment tank 2 may be configured such that the partition with the cooling tank 1 is divided into a partition plate and a bottom plate, and the position of the partition plate is adjusted with respect to the bottom plate. This makes it possible to arbitrarily change the volume ratio between the adjustment tank and the cooling tank and the area of the partition wall adjacent to both tanks.

(Industrial applicability)

INDUSTRIAL APPLICABILITY The present invention can be applied as a temperature regulating device for a molding die in a plastic injection molding machine and as a temperature regulating device for a residential environment, for example, as an apparatus for generating air conditioning water for conditioning.

One… Cooling tank
1a ... The upstream side space
1b ... The downstream side space
2… Control tank
3 ... septum
4… Overflow
5 ... Cooling device
8… Evaporator
10 ... mold
11 ... The coolant circulation flow path
12 ... Branch euro
13 ... Control valve
14 ... Bypass Euro
15 ... The first temperature sensor
17 ... Heater
18 ... The second temperature sensor
31 ... The first cooling-
32 ... The second cooling bath connection flow path
33 ... Connection port for ice melting
34 ... Connection port for ice production
35 ... The first control valve
36 ... The second control valve
P ... Pump

Claims (7)

A cooling device having an evaporator capable of cooling a cooling liquid containing water and cooling the cooling liquid to generate ice,
A cooler provided so as to communicate between a cooling space on an upstream side and a liquid delivery space on the downstream side and in which the evaporator of the cooling device is disposed in the cooling space and accommodates the cooling liquid cooled by the evaporator,
An adjusting tank for storing a cooling liquid sent from the liquid-feeding space of the cooling bath,
A cooling liquid circulating flow path for returning the liquid from the adjusting tank to the adjusting tank via the mold,
A branching flow path branching from the middle of the cooling liquid circulating flow path and reaching the cooling space of the cooling bath,
A control valve provided in the middle of the branch passage,
A first temperature sensor for detecting the temperature of the cooling liquid in the adjusting tank or the cooling liquid circulating flow path,
And a heater provided in the regulating tank or in the cooling liquid circulating flow passage and having a control function for ON / OFF operation by comparing the detected temperature of the first temperature sensor with a preset heating start set temperature,
Wherein the heater is turned ON when the detected temperature of the first temperature sensor is lower than the heating start set temperature and is turned OFF when the detected temperature is the heating start set temperature or more, The control valve is opened so that a part of the high-temperature cooling liquid in the cooling liquid circulating flow path is returned to the cooling space of the cooling bath, and the amount of liquid returned to the cooling space of the cooling bath The cooling liquid is introduced into the adjustment tank from a low-temperature side,
Wherein the cooling bath and the conditioning bath are integrally formed by partition walls,
A second temperature sensor for detecting the temperature of the cooling liquid in the cooling bath is provided in the vicinity of the boundary between the cooling space and the liquid supply space of the cooling bath and the cooling device is controlled by the detected temperature of the second temperature sensor, Wherein the temperature control means controls the temperature of the cooling liquid in the cooling bath and controls the generation of ice in the cooling space. The apparatus according to claim 1, wherein the second temperature sensor is disposed at a position of 1 cm to 10 cm away from the bore surface of the bipolar plate so as not to contact the wall surface of the cooling bath. The refrigeration apparatus according to any one of claims 1 to 4, wherein a distal end portion of the branch passage is branched into at least two to form a plurality of cooling bath connection channels, and one of the cooling bath connection channels is connected to an ice One of the cooling bath connecting flow paths is connected to an ice making connection port provided in a cooling space in the vicinity of the liquid delivery space or the liquid delivery space,
Wherein the branch flow path is provided with a flow path switching mechanism for switching the cooling bath connection flow path for sending the high temperature cooling liquid from the cooling liquid circulation flow path. 4. The molding die according to claim 3, wherein the control valve is provided on each of the flow paths after the branching flow path is divided into the cooling bath connection flow paths, and the control valve also functions as the flow path switching mechanism Temperature control unit. The control valve according to claim 3, characterized in that the control valve is provided on the upstream side of the branching flow path branching into each cooling bath connection flow path, And a temperature adjusting device for adjusting the temperature of the molding die. delete delete

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