JP2005205876A - Heating and cooling apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the frequency of apparatus maintenance by swiftly heating and cooling to a temperature required by a load. <P>SOLUTION: A heating and cooling apparatus 2 uses a medium capable of heating to a heating limit temperature of 200°C or higher and cooling to 0°C or lower in a liquid phase state. A heating medium circulation circuit C3 includes a heater 24 for heating the medium to a temperature higher than a heating set temperature required by the load W, supplies a heated medium to the load W through a third supply flow path 26 and returns the medium supplied to the load W through a forth return flow path 37. A cooling medium circulation circuit C2 includes a cooler 14 for cooling the medium to a temperature lower than a cooling set temperature required by the load W, and returns the medium supplied to the load W through a fifth return flow path 38. In response to the requirement of the load W, the circulation circuits C2 and C3 are switched to heat and cool the load W. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heating / cooling device for heating and cooling a load such as a plastic molding die.

  In plastic molding, molten plastic is poured into a mold cavity that is held so that the mold can be opened, and after solidification, the cavity is opened to take out the molded plastic. When the molten plastic is injected into the cavity, the mold is heated to a predetermined temperature, and when the injected plastic is solidified, it is necessary to cool the mold to the predetermined temperature. For this reason, in a plastic molding machine, a heating / cooling device for supplying a heating medium to a mold and further supplying a cooling medium is used.

  As this type of heating and cooling device, for example, the heating and cooling device described in Patent Document 1 is known. This heating / cooling device uses, as loads, a heating medium circulation circuit that supplies and returns a liquid phase medium set at a high temperature to the load, and a cooling medium circulation circuit that supplies and returns a liquid phase medium set at a low temperature to the load. This is switched according to the molding process of the mold, and this is heated and cooled.

JP 2003-145599 A

  Usually, in the plastic molding process, it is necessary to heat the mold to a set temperature of, for example, about 140 ° C. in the injection process of the molten plastic, and to take out the solidified plastic to the set temperature at which the mold becomes room temperature. Need to be cooled. Here, in consideration of the production efficiency of plastic molding, it is desirable that the time to reach the heating set temperature and the cooling set temperature is as short as possible, and the plastic molding process is shortened.

  On the other hand, the heating and cooling apparatus described in Patent Document 1 uses water as a medium, and is merely supplied with hot water and cooling water according to the molding process of the mold. It is not possible to heat up to the heating set temperature (for example, 140 ° C.). Therefore, by using pressurized heated water or hot steam, pressurized heated water or hot steam having a temperature higher than normal hot water temperature (100 ° C.) (for example, 150 ° C.) is supplied to the mold, and the mold requirements The mold is heated until the heating set temperature (for example, 140 ° C.) is reached.

  However, when pressurized heated water or steam is used, a significantly larger compressor and boiler equipment is required than equipment required for plastic mold molding. Advanced maintenance of the pipes leading to is required. In particular, when hot steam is used, the frequency of maintenance for rust generated in the piping becomes significant.

  Furthermore, decisively, even if equipment that requires such a large-scale and high-level maintenance is prepared, the pressurized heated water or hot steam obtained by this is the heating set temperature required by the mold (for example, Only a slightly higher temperature (150 ° C.) than that of 140 ° C.), rapid heating until reaching the mold heating set temperature, and rapid cooling until the mold cooling set temperature is reached. Of the requests, the former request cannot be satisfied.

  Furthermore, depending on the type of plastic molding, when the molten plastic is injected into the cavity, the mold is heated to a temperature exceeding 140 ° C., for example, 140 ° C. to 200 ° C., and the plastic after the injection is solidified. Attempts to shorten the plastic molding process by allowing the solidified plastic to be taken out by, for example, a robot and maintaining the mold at a relatively high temperature while only cooling to a high temperature (up to 150 ° C.) exceeding Has been made.

  Thus, it can be seen that in order to realize a shortened cycle of the plastic molding process, it is essential to rapidly heat the mold at a high set temperature. Moreover, considering the maintenance of the heating / cooling device and the piping, the medium for heating and cooling the mold has the characteristics that it can be heated to a high temperature in the liquid phase and can be cooled to a low temperature in the liquid phase, It is desirable to be able to realize these high and low temperature states.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a heating and cooling device that can rapidly heat and cool to a temperature that requires a load and can reduce the frequency of device maintenance. To do.

  In order to achieve the above object, the present invention provides a heating medium circulation circuit for supplying and returning a medium set at a high temperature to a load, and a cooling medium for supplying and returning a medium set at a low temperature to a load. In a heating / cooling apparatus that heats and cools a load by switching a circulation circuit, the medium can be heated to a heating limit temperature of 200 ° C. or higher in a liquid phase and can be cooled to 0 ° C. or lower. The heating medium circulation circuit includes a heating unit that heats the medium until it reaches a temperature higher than a heating setting temperature required by the load, a supply unit that supplies the heated medium to the load, and a medium that is supplied to the load. The cooling medium circulation circuit has cooling means for cooling the medium until the temperature becomes lower than a cooling set temperature required by the load, and a supply means for supplying the cooled medium to the load. When, and a return means for returning the medium supplied to the load, characterized by heating and cooling the load by switching the heating medium circulation circuit and the cooling medium circulation circuit in response to load demand.

  The heating means heats the medium to near the heating limit temperature, and the heating medium circulation circuit detects the temperature of the medium heated by the heating means, and the temperature detected thereby. When the temperature is equal to or higher than the heating limit temperature, it is preferable to include a mixing unit that mixes the cooled medium with the heated medium and lowers the temperature.

  Moreover, it is preferable that the said cooling means cools the said medium to the temperature which becomes 10 degreeC or more and lower temperature than the cooling preset temperature which a load requires.

  Furthermore, it is preferable that the medium is a perfluoropolyether having the following general formula (2).

  According to the heating and cooling apparatus of the present invention, a medium that heats and cools a load can be heated in a liquid phase to a heating limit temperature of 200 ° C. or higher and can be cooled to 0 ° C. or lower. The heating medium circulation circuit uses a heating means for heating the medium until the heating set temperature required by the load becomes higher, a supply means for supplying the heated medium to the load, and returning the medium supplied to the load. The cooling medium circulation circuit includes a cooling means for cooling the medium until the temperature becomes lower than a cooling set temperature required by the load, a supply means for supplying the cooled medium to the load, and a load. A return means for returning the supplied medium, and heating and cooling the load by switching between the heating medium circulation circuit and the cooling medium circulation circuit according to the demand of the load, so that the temperature is rapidly heated and cooled to the temperature requiring the load. This Can. Therefore, for example, when heating and cooling using a plastic molding die as a load, it is possible to realize a shortened cycle of the plastic molding process. In addition, since the heating and cooling of the load is performed using a single liquid phase medium, advanced maintenance of the heating and cooling device and the piping becomes unnecessary. Furthermore, unlike the case where water is used as a medium, there is no need to install an expensive and large-scale compressor or boiler.

  The heating means heats the medium to near the heating limit temperature, and the heating medium circulation circuit detects the temperature of the medium heated by the heating means, and the temperature detected thereby is the heating limit temperature. In the case of the above, a mixing unit that mixes the cooled medium with the heated medium and lowers the temperature thereof is provided, so even if the heating unit heats exceeding the heating limit temperature of the medium, the medium is removed. It is possible to cool below the heating limit temperature and to prevent gas generation due to thermal decomposition of the medium.

  Further, the cooling means cools the medium to a temperature that is 10 ° C. or higher and lower than the cooling set temperature required by the load, so that condensation does not occur in the heating / cooling device and piping, and rust is generated due to this. Can be prevented and the frequency of maintenance can be reduced.

  Moreover, since the medium is a perfluoropolyether of the general formula 3 below, the medium can be heated in a liquid phase to a high temperature of 200 ° C. to 260 ° C. Moreover, there is no fear of combustion even when heated to such a temperature. Further, the same medium can be cooled in a liquid phase state to a low temperature of, for example, −50 ° C., and rapid heating and cooling to a temperature required by a load can be performed.

  In FIG. 1, a heating / cooling device 2 to which the present invention is applied includes a primary side circuit C1, a cooling medium circulation circuit C2, a heating medium circulation circuit C3, a cooling / heating medium supply circuit C4, and a primary cooling water circulation circuit C5. . The heating / cooling device 2 rapidly heats a load W (for example, a mold of a plastic molding machine) to a heating state of 140 to 200 ° C. and rapidly cools the medium to a cooling state of normal temperature to 150 ° C. It heats to 200-260 degreeC, is supplied to the load W, is cooled to 10-100 degreeC, and is supplied. Here, the broken line in the figure is a flow path through which either a cooled medium (hereinafter referred to as a cooling medium) or a heated medium (hereinafter referred to as a heating medium) passes, and the alternate long and short dash line is a cooling medium. Only the passage through which only the heating medium passes, and the two-dot chain line show the passage through which only the heating medium passes.

  The primary side circuit C1 is provided with a compressor 10, a condenser 11, an expansion valve 12, and a first heat exchanger 13. The refrigerant gas (primary refrigerant) in the primary circuit C1 is compressed by the compressor 10 to be in a high temperature / high pressure state. The primary-side refrigerant that has reached a high temperature / high pressure state is liquefied by the condenser 11 and then gasified by the expansion valve 12, and the cooling medium circulation circuit C <b> 2 and the cooling / heating medium supply circuit via the first heat exchanger 13. The C4 medium is cooled to form a cooling medium. The compressor 10, the condenser 11, the expansion valve 12, and the first heat exchanger 13 constitute a cooler 14.

  The cooling medium circulation circuit C2 includes a main passage 15, a first supply passage 16, a first return passage 17, and a common passage 18 with the heating medium circulation circuit C3. The common flow path 18 is provided with a first circulation pump 19 and first and second three-way valves 20 and 21.

  When the flow path is switched to the direction A by the first and second three-way valves 20, 21 and the first circulation pump 19 is activated, the medium in the main tank 15 becomes the first supply flow path 16, the first three-way valve 20. The first circulation pump 19, the second three-way valve 21, and the first return flow path 17 are circulated in this order, and the first return flow path 17 is lower in temperature than the cooling set temperature required by the load W by the first heat exchanger 13. It is cooled to a temperature of 10 ° C. or higher (for example, 10 to 100 ° C.) and returned to the main tank 15 again. That is, in the cooling medium circulation circuit C2, when the flow path is switched to the direction A, the cooling medium cooled by the first heat exchanger 13 is circulated and held. On the other hand, when the flow path is switched to the direction B by the first and second three-way valves 20 and 21, the medium in the main tank 15 is blocked before the first three-way valve 20, and the cooling medium circulation circuit C2 The circulation of the medium in is stopped. In addition, as a medium stored in the main tank 15, a fluorinated liquid medium (trade name Galden, trade name Fluorinert, etc.) is used.

  As shown in the following equation (4), the basic chemical structure of a fluorine-based liquid medium such as the above-mentioned trade name Galden and trade name Florinart is perfluoropolyether. This perfluoropolyether has a specific heat of 963 J / kgK (0.23 cal / g ° C.) and can be heated and cooled over a wide temperature range (for example, −50 to 260 ° C.). And more characteristically, it can be heated to a high temperature of 200 to 260 ° C. in a liquid phase state, and there is no fear of combustion even if it is heated to such a temperature. Moreover, since it can cool in a liquid phase state to -50 degreeC low temperature, rapid heating and cooling to the temperature which a load requires can be performed.

  Product Name Galden Model Number HT-200 is -75 to 200 ° C, HT-230 is -75 to 230 ° C, HT-270 is -75 to 250 ° C, D40 is -60 to 260 ° C, and JPJ is -50 to 260 ° C. Heating and cooling in a liquid phase state can be performed over the temperature range. Therefore, what is necessary is just to select arbitrarily the heating-cooling medium used for the heating-cooling apparatus of this invention from these.

  In order to rapidly heat a load such as a mold, it is preferable to heat the medium to near the heating limit temperature and supply the load to the load regardless of the temperature required by the load. As will be described later, if the medium is heated beyond the heating limit temperature, there is a risk that gas is generated. Therefore, the circulation circuit has a temperature detecting means for detecting the temperature of the heated medium, and this temperature is the heating set temperature. When it is detected as above, it is preferable to provide a mixing means for mixing the cooling medium with the heating medium to lower the temperature.

  On the other hand, in order to rapidly cool a load such as a mold, it is conceivable that the load is cooled to near the cooling limit temperature of the medium and supplied to the load regardless of the temperature required by the load. In consideration of maintenance of piping and the like, it is preferable that the cooling is performed at a temperature lower than the cooling set temperature required by the load and at a temperature of 10 ° C. or higher because condensation does not occur in the heating / cooling device and piping.

  Furthermore, since the specific heat of the medium is relatively low, when the medium is supplied to the load, the temperature of the heated medium may decrease or the temperature of the cooled medium may increase due to heat exchange between the piping material and the atmosphere. There is. If this effect is expected to be significant, the length of the pipe until the load is shortened, the pipe is insulated, or the heating medium supply channel immediately before the heating medium is supplied to the load A ribbon heater that is turned on in synchronization with the heating cycle may be provided to reheat the heating medium whose temperature has decreased.

  Also, depending on the type of plastic molding, when injecting molten plastic into the cavity, the mold is heated to a temperature exceeding 140 ° C., for example, 140 to 200 ° C., and the plastic after injection is solidified at room temperature. Attempts have been made to shorten the plastic molding process by keeping the mold at a relatively high temperature by taking out the solidified plastic by, for example, a robot while cooling only to a high temperature (up to 150 ° C.) exceeding However, in consideration of the above-described heat loss of the medium used in the present invention, it is possible to provide a heating / cooling apparatus that is most useful for a plastic molding machine that has attempted to shorten the cycle.

  Returning to FIG. 1, the heating medium circulation circuit C <b> 3 includes a mixing tank 22, a first three-way valve 20, a common flow path 18, a first circulation pump 19, a second three-way valve 21, and a second return flow path 23. The mixing tank 22 has a heater 24, and the heater 24 heats the medium to a high temperature setting temperature (for example, 200 to 260 ° C.) much higher than the heating setting temperature required by the load to obtain a heating medium.

  When the flow path is switched to the direction B by the first and second three-way valves 20 and 21, and the first circulation pump 19 is activated, the medium in the mixing tank 22 is changed to the first three-way valve 20, the first circulation pump 19, The second three-way valve 21 and the second return flow path 23 are circulated in this order and returned to the mixing tank 22 again. That is, in the heating medium circulation circuit C3, when the flow path is switched to the direction B, the heating medium heated by the heater 24 is circulated and held. On the other hand, when the flow path is switched to the direction A by the first and second three-way valves 20, 21, the medium in the mixing tank 22 is blocked before the first three-way valve 20, and the heating medium circulation circuit C3. The circulation of the medium in is stopped.

  The main tank 15 and the mixing tank 22 are connected to second and third supply passages 25 and 26 for supplying a cooling medium and a heating medium to the cooling / heating medium supply circuit C4. The second and third supply channels 25 and 26 are connected by a third three-way valve 27. When the flow path is switched to the direction A by the third three-way valve 27, the heating medium circulated and held in the heating medium circulation circuit C3 flows into the cooling / heating medium supply circuit C4. At the same time, the first three-way valve 20 and the second three-way valve 21 are also switched in the direction A to select the cooling medium circulation circuit C2, and the cooling medium circulates through the cooling medium circulation circuit C2.

  On the other hand, when the flow path is switched to the direction B by the third three-way valve 27, the cooling medium circulated and held in the cooling medium circulation circuit C2 flows into the cooling / heating medium supply circuit C4. At the same time, the first three-way valve 20 and the second three-way valve 21 are also switched in the direction B to select the heating medium circulation circuit C3 from the cooling medium circulation circuit C2, and the heating medium circulates through the heating medium circulation circuit C3. It will be.

  The cooling / heating medium supply circuit C <b> 4 includes a third three-way valve 27, a second circulation pump 28, a fourth supply passage 29, a bypass passage 30, and a third return passage 31. The fourth supply flow path 29 is provided with a first control valve 32, to which first and second temperature sensors Tc1 and Tc2 for detecting the temperatures of the cooling medium and the heating medium, respectively, and a pressure gauge P are connected. Yes. The fourth supply channel 29 and the third return channel 31 are provided with control valves 33 and 34, respectively. The cooling medium or heating medium supplied from the cooling medium circulation circuit C2 or the heating medium circulation circuit C3 via the third three-way valve 27 is supplied to the load W via the second circulation pump 28 and the fourth supply flow path 29. Is done.

  A bypass valve 35 is provided in the bypass flow path 30. The medium that has not been supplied to the load W through the first control valve 32 passes through the bypass flow path 30. The medium that has passed through the bypass flow path 30 is returned to the third return flow path 31 via the bypass valve 35.

  The cooling medium or heating medium supplied to the load W via the fourth supply channel 29 is returned to the third return channel 31 after cooling or heating the load W to a desired temperature.

  The opening degree of the first control valve 32 is set to a time desired by the load W by a controller 52 (see FIG. 2) described later according to the outputs of the first and second temperature sensors Tc1, Tc2 and the pressure gauge P. Controlled to be at temperature. Therefore, the first control valve 32 may be fully opened or fully closed. In addition, as the first control valve 32, a needle-type valve capable of highly accurate control from a minute flow rate to a large flow rate, for example, a general-purpose electronic expansion valve PKV type or EKV type manufactured by Kinomiya Seisakusho Co., Ltd. is used.

  The third return channel 31 is branched into a fourth return channel 37 and a fifth return channel 38 by the fourth three-way valve 36. The fourth return flow path 37 is connected to the mixing tank 22. The fifth return flow path 38 is connected to the first return flow path 17 of the coolant circulation circuit C2 before the first heat exchanger 13.

  When the flow path is switched to the direction A by the fourth three-way valve 36, the medium in the third return flow path 31 is returned to the mixing tank 22 via the fourth return flow path 37. On the other hand, when the flow path is switched to the direction B by the fourth three-way valve 36, the medium in the third return flow path 31 passes through the fifth return flow path 38 and the first heat in the first return flow path 17. After being cooled by the exchanger 13, it is returned to the main tank 15.

  The first to fourth three-way valves 20, 21, 27, 36 basically switch the flow paths in the directions of A and B in synchronization. For example, when the flow path is switched to the direction A by the third three-way valve 27 and the heating medium is supplied to the cooling / heating medium supply circuit C4 and the heating medium is returned to the mixing tank 22, the cooling medium is selected. The cooling medium is circulated in the circulation circuit C2, the heating medium circulation circuit C3 through which the heating medium is circulated, and the second supply flow path 25 to which the cooling medium is supplied are stopped. Similarly, for example, when the flow path is switched to the direction B by the third three-way valve 27 and the cooling medium is supplied to the cooling / heating medium supply circuit C4 and the cooling medium is returned to the main tank 15 is selected. The heating medium is circulated in the heating medium circulation circuit C3, the cooling medium circulation circuit C2 through which the cooling medium is circulated, and the third supply flow path 26 to which the heating medium is supplied are stopped.

  The primary coolant circulation circuit C <b> 5 includes an outdoor cooler 39 such as a cooling tower, a second heat exchanger 40, a fifth supply channel 41, and a sixth return channel 42. A branch supply channel 43 and a branch return channel 44 are connected to the fifth supply channel 41 and the sixth return channel 42, respectively, and a second control valve 45 is provided in the branch supply channel 43. ing. The fifth supply channel 41 and the sixth return channel 42 are provided with control valves 46 and 47, respectively.

  The second control valve 45 controls the flow rate of the primary cooling water supplied to the second heat exchanger 40 via the branch supply channel 43. The opening degree of the second control valve 45 is determined by the controller 52 in accordance with the outputs of the third and fourth temperature sensors Tc3 and Tc4 for detecting the temperature of the return medium of the cooling / heating medium supply circuit C4 and the set temperature of the load W. Be controlled.

  For example, when the output of the third temperature sensor Tc3 (return temperature of the cooling medium) is higher than the output of the fifth temperature sensor Tc5 of the main tank 15 or the set temperature of the cooling medium supplied to the load, the controller 52 Then, the second control valve 45 is opened, heat is exchanged between the return cooling medium and the primary cooling water passing through the second heat exchanger 40, and control is performed to remove the coarse heat of the return cooling medium. On the other hand, when the output of the fourth temperature sensor Tc4 (the return temperature of the heating medium) is lower than the set temperature of the heating medium supplied to the load, the controller 52 increases the output of the heater 24 of the mixing tank 22. Control.

  When the flow path is switched from A to B by the fourth three-way valve 36 and the heating medium that has heated the load W until then flows into the fifth return flow path 38, the second control valve 45 is fully opened. The heating medium that has flowed into the fifth return flow path 38 is heat-exchanged with the primary cooling water that passes through the second heat exchanger 40 via the branch supply flow path 43, and the rough heat can be removed. On the other hand, when the flow path is switched from B to A by the fourth three-way valve 36 and the medium does not flow into the fifth return flow path 38, the second control valve 45 is fully closed. By the above operation, the burden on the cooler 14 can be reduced, and energy saving of the apparatus can be promoted. Reference numeral 48 denotes a supply flow path for supplying the medium from the main tank 15 to the mixing tank 22.

  The switching of the flow path to A and B by the first to fourth three-way valves 20, 21, 27, 36 is not limited to the above embodiment, and the first to fourth three-way valves 20, 21 are controlled by the controller 52. , 27 and 36 can be devised to further promote energy saving of the apparatus. That is, the first to fourth three-way valves 20, 21, 27, and 36 basically operate according to the same rule, but the operation timing of each three-way valve can be shifted.

  For example, when the third three-way valve 27 is switched from A to B and the state where the heating medium is supplied to the cooling / heating medium supply circuit C4 is switched to the state where the cooling medium is supplied, the cooling / heating medium is used until then. The switching of the fourth three-way valve 36 from A to B is delayed until the heating medium supplied to the supply circuit C4 is pushed out by the newly supplied cooling medium and passes through the fourth three-way valve 36, and thereafter This switching can be performed. If it does in this way, a heating medium will be collect | recovered by the mixing tank 22 without flowing in into the 5th return flow path 38, and, thereby, the drive amount of the 2nd heat exchanger 40 and the cooler 14 can be minimized.

  Similarly, when the third three-way valve 27 is switched from B to A and the cooling medium is supplied to the cooling / heating medium supply circuit C4 to the state where the heating medium is supplied, the cooling / heating is performed until then. The switching of the fourth three-way valve 36 from B to A is delayed until the cooling medium supplied to the medium supply circuit C4 is pushed out by the newly supplied heating medium and passes through the fourth three-way valve 36. This switching can be done later. Thereby, the cooling medium does not flow into the mixing tank 22 and the driving amount of the heater 24 can be minimized.

  Further, by selecting the switching timing of the first and second three-way valves 20 and 21 according to the switching operation of the third three-way valve 27, the same effect can be obtained. For example, if the first three-way valve 20 is switched and the second three-way valve 21 is switched at the timing when the cooling medium or the heating medium in the common flow path 18 passes through the second three-way valve 21, the heating medium is the first. Since it does not flow into the heat exchanger 13 and the cooling medium does not flow into the mixing tank 22, the driving amounts of the cooler 14 and the heater 24 can be minimized.

  As shown in FIG. 2, the outputs of the first to fifth temperature sensors Tc <b> 1 to Tc <b> 5 are input to the first and second temperature regulators 50 and 51. The first and second temperature controllers 50 and 51 are connected to a controller 52 such as a sequencer. The first and second temperature controllers 50 and 51 are respectively input with the high temperature set temperature and the heating limit temperature of the medium supplied to the load W during cooling and heating, and the first to fifth temperature sensors Tc1. When the output of .about.Tc5 reaches the heating limit temperature, a warning alarm is issued.

  In addition to the first and second temperature controllers 50 and 51, a pressure gauge P is connected to the controller 52. Based on the heating / cooling switching request signal issued by the load device controller 53 and the flow rate information transmitted from the pressure gauge P, the controller 52 cools the heater 14, the heater 24, and the first to fourth three-way valves 20, 21, 27. , 36 and the driving of the first and second control valves 32, 45 are controlled. The controller 52 is also operated to communicate with the load device controller 53 and synchronize with each other.

  When cooling the load W, the controller 52 operates the first to fourth three-way valves 20, 21, 27, and 36 to switch the flow path to the B direction. When the output of the first temperature sensor Tc1 is the set temperature, the first control valve 32 is closed and control is performed so that the load W is not further cooled. On the other hand, when the output of the first temperature sensor Tc1 is equal to or higher than the set temperature, the first control valve 32 is opened and the cooling medium is introduced into the load W. Further, the controller 52 adjusts the opening degree of the second control valve 45 according to the output of the first temperature sensor Tc1, and removes the rough heat of the medium in the fifth return flow path 38. Furthermore, the controller 52 operates the heater 24 of the mixing tank 22 and heats the medium by the heating medium circulation circuit C3 to obtain a heating medium.

  When an instruction to heat the load W is given from the load device controller 53, the controller 52 operates the first to fourth three-way valves 20, 21, 27, and 36 to switch the flow path to the A direction. Then, when the output of the second temperature sensor Tc2 is the set temperature, the first control valve 32 is closed and control is performed so that the load W is not further heated. On the other hand, when the output of the second temperature sensor Tc2 is equal to or lower than the set temperature, the first control valve 32 is opened and the heating medium is introduced into the load W. Further, the controller 52 fully closes the second control valve 45. Further, the controller 52 operates the cooler 14 to cool the medium in the cooling medium circulation circuit C2 to obtain a cooling medium.

  Next, the operation of the heating / cooling device 2 will be described with reference to FIGS. 1 and 2. First, in the initial state, the flow path is A by the first three-way valves 20, 21, 27, and 36, and the cooler 14, the first and second circulation pumps 19 and 28, and the heater 24 are driven by the controller 52. Is done.

  In the cooling medium circulation circuit C2, the medium in the main tank 15 is circulated in the order of the first supply flow path 16, the first three-way valve 20, the first circulation pump 19, the second three-way valve 21, and the first return flow path 17. The medium is cooled by the first heat exchanger 13 to a temperature of 10 ° C. or higher (for example, 10 to 100 ° C.) at a temperature lower than the cooling set temperature required by the load and held as a cooling medium. On the other hand, in the heating medium circulation circuit C3, the medium in the mixing tank 22 is blocked before the first three-way valve 20, and the circulation of the medium in the heating medium circulation circuit C3 is stopped.

  In the cooling / heating medium supply circuit C4, the heating medium in the mixing tank 22 heated to a high temperature setting temperature (for example, 200 to 260 ° C.) that is much higher than the heating setting temperature required by the load by the heater 24 is the third temperature. It is introduced into the load W via the supply channel 26, the third three-way valve 27, the second circulation pump 28, and the fourth supply channel 29. At this time, the temperature of the heating medium is detected by the second temperature sensor Tc2.

  When the output of the second temperature sensor Tc2 is the set temperature, the controller 52 closes the first control valve 32. The heating medium that has not been supplied to the load W is returned to the third return flow path 31 via the bypass flow path 30.

  On the other hand, when the output of the second temperature sensor Tc2 is equal to or lower than the set temperature, a pulse signal corresponding to the detected temperature is output from the controller 52, and the opening degree of the first control valve 32 is adjusted. The heating medium introduced into the load W is returned again to the mixing tank 22 via the third return channel 31 and the fourth return channel 37. In the primary coolant circulation circuit C5, the controller 52 causes the second control valve 45 to be fully closed.

  When an instruction to cool the load W is given from the load device controller 53, the flow path is switched to B by the first to fourth three-way valves 20, 21, 27, 36 by the controller 52. In the heating medium circulation circuit C 3, the medium in the mixing tank 22 is circulated in the order of the first three-way valve 20, the first circulation pump 19, the second three-way valve 21, and the second return flow path 23, and is heated by the heater 24. It is held as a heating medium. On the other hand, in the cooling medium circulation circuit C2, the medium in the main tank 15 is blocked before the first three-way valve 20, and the circulation of the medium in the cooling medium circulation circuit C2 is stopped.

  In the cooling / heating medium supply circuit C4, the cooling medium that has been cooled by the cooler 14 and circulated / held in the cooling medium circulation circuit C2 before switching is supplied to the second supply flow path 25, the third three-way valve 27, the second It is introduced into the load W via the circulation pump 28 and the fourth supply flow path 29. At this time, the temperature of the cooling medium is detected by the first temperature sensor Tc1.

  When the output of the first temperature sensor Tc1 is the set temperature, the controller 52 closes the first control valve 32. The cooling medium that has not been supplied to the load W is returned to the third return flow path 31 via the bypass flow path 30.

  On the other hand, when the output of the first temperature sensor Tc1 is equal to or higher than the set temperature, a pulse signal corresponding to the detected temperature is output from the controller 52, and the opening degree of the first control valve 32 is adjusted. The cooling medium introduced into the load W is cooled by the first heat exchanger 13 in the first return channel 17 via the third return channel 31 and the fifth return channel 38, and then the main tank 15. Returned to

  In the primary cooling water circulation circuit C5, the second control valve 45 is fully opened by the controller 52 immediately after the flow path is switched from A to B. Thereafter, the opening degree of the second control valve 45 is adjusted by the controller 52 in accordance with the output of the first temperature sensor Tc1. In the heating / cooling device 2, the above series of operations is repeatedly performed in response to a switching command from the load device controller 53.

  As described above, while the load W is heated or cooled by the cooling / heating medium supply circuit C4, the cooling medium circulation circuit C2 or the heating medium circulation circuit C3 cools or heats the medium to circulate and hold the load. When a switching command is issued from the device controller 53, the medium held in the cooling medium circulation circuit C2 or the heating medium circulation circuit C3 is immediately introduced into the cooling / heating medium supply circuit C4, so that the temperature state of the load W can be quickly determined. Can be changed.

  Further, the cooling medium circulation circuit C2 and the cooling / heating medium supply circuit C4 constitute a cooler 14, the heating medium circulation circuit C3 and the cooling / heating medium supply circuit C4 constitute a heater 24, and the cooling medium circulation circuit C2 and the heating medium circulation. The circuit C3 shares the first circulation pump 19, and the cooling / heating medium supply circuit C4 cools and heats the load W with the second circulation pump 28, the fourth supply channel 29, and the third return channel 31. Therefore, the entire heating / cooling device 2 can be gathered in a compact manner, and the parts cost can be saved.

  Further, a communication flow path is provided between the cooling medium circulation circuit C2 and the heating medium circulation circuit C3, and when the medium is overheated by the heater 24, the cooling medium circulation circuit C2 and the heating medium circulation circuit are connected via the communication flow path. A cooling medium may be introduced into C3. In this case, the flow rate of the cooling medium is controlled according to the output signal of the second temperature sensor Tc2.

  In the above embodiment, the case where there is one load W has been described as an example, but a plurality of loads, for example, two loads Wa and Wb (for example, a mold cavity and a core of a plastic molding machine) as shown in FIG. The present invention can also be applied to the heating / cooling device 60 that controls the temperature of the heater.

  The heating / cooling device 60 has a basic configuration similar to that of the heating / cooling device 2 shown in FIG. 1, but includes cooling / heating medium supply circuits C4a and C4b for the loads Wa and Wb, respectively. The fourth supply flow path 29b of the cooling / heating medium supply circuit C4b is provided between the first circulation pump 19 and the first control valve 32a of the cooling / heating medium supply circuit C4a. It branches off from the supply flow path 29a. The third return flow path 31b of the cooling / heating medium supply circuit C4b is connected to the third return flow path 31a of the cooling / heating medium supply circuit C4a. The third return flow paths 31a and 31b are provided with auxiliary pumps 61a and 61b for drawing the medium supplied to the loads W1 and W2 into the flow paths 31a and 31b.

  In the heating / cooling device 60, the opening degree of each control valve 32a, 32b is adjusted according to the outputs of the temperature sensors Tc1a to Tc4a, Tc1b to Tc4b and the pressure gauges Pa and Pb of the cooling / heating medium supply circuits C4a and C4b. By doing so, each load W1, W2 is cooled or heated to a desired set temperature. If it does in this way, when molding the complicated product from which thickness and a shape differ partially, for example in plastic molding, it will become possible to perform appropriate temperature control with a cavity and a core, respectively.

  In FIG. 4 showing still another embodiment of the present invention, the heating / cooling device 100 has the first and second three-way valves 20 and 21 omitted, and the third three-way valves 27a and 27b and the fourth three-way valves 36a and 36b. It is provided in the vicinity of the loads Wa and Wb. Further, instead of the first and second three-way valves 20 and 21, the second supply flow passages 25, 25a and 25b, the fifth return flow passages 38, 38a and 38b, and the bypass valves 101 and 102a for connecting them, respectively. , 102b constitutes the coolant circulation circuit C2. Further, instead of the first and second three-way valves 20 and 21, the third supply flow passages 26, 26a and 26b, the fourth return flow passages 37, 37a and 37b, and the bypass valves 103 and 104a for connecting them, respectively. , 104b constitute a heating medium circulation circuit C3. The same parts as those in FIGS. 1, 2, and 3 are designated by the same reference numerals and description thereof is omitted.

  When cooling the loads Wa and Wb, the main tank 15, the pump 105, the second supply flow path 25, and the third three-way valves 27 a and 27 b and the fourth three-way valves 36 a and 36 b are respectively switched to the B direction. 25a, 25b, third three-way valves 27a, 27b, fourth supply flow paths 29a, 29b, loads Wa, Wb, third return flow paths 31a, 31b, fourth three-way valves 36a, 36b, fifth return flow path 38, A cooling medium supply circuit that is cooled by the second heat exchanger 40 and returned to the main tank 15 is formed via 38a and 38b.

  In this embodiment, the cooler 14 is optionally installed. When using the cooler 14, the fifth three-way valve 106 is switched to the direction D, and the cooling medium returned from the fifth return flow path 38 is introduced into the first heat exchanger 13. When the cooler 14 is not used, the fifth three-way valve 106 is switched to the direction C, and the cooling medium is cooled only by the second heat exchanger 40.

  By the way, when the third three-way valves 27a, 27b and the fourth three-way valves 36a, 36b are each set in the direction B in order to cool the loads Wa, Wb, the third supply flow path is supplied from the mixing tank 22 by the pump 107. 26 is blocked by the third three-way valves 27a and 27b, and the fourth return flow paths 37, 37a and 37b are closed by the fourth three-way valves 36a and 36b. As a result, the heating medium circulates in the heating medium circulation circuit C3 that is returned to the mixing tank 22 via a bypass passage that passes through the mixing tank 22, the pump 107, and the bypass valve 103, and part of the heating medium further passes to the bypass valves 104a and 104b. Finally, it circulates through the heating medium circulation circuit C3 returned to the mixing tank 22.

  On the other hand, when the loads Wa and Wb are heated, the third three-way valves 27a and 27b and the fourth three-way valves 36a and 36b are respectively switched in the direction A, so that the mixing tank 22, the pump 107, and the third supply channel are switched. 26, 26a, 26b, third three-way valves 27a, 27b, fourth supply flow paths 29a, 29b, loads Wa, Wb, third return flow paths 31a, 31b, fourth three-way valves 36a, 36b, fourth return flow paths A heating medium supply circuit that is returned to the mixing tank 22 via 37, 37a, and 37b is formed.

  In this embodiment, the fourth return flow path 37 is provided with a third heat exchanger 108 that exchanges heat with the primary cooling water, and overheating of the heating medium returned to the fourth return flow path 37 is detected by the temperature sensor Tc4. When this is detected, the third heat exchanger 108 cools the heating medium.

  By the way, when the third three-way valves 27a and 27b and the fourth three-way valves 36a and 36b are each set to the direction A in order to heat the loads Wa and Wb, the second supply flow path is supplied from the main tank 15 by the pump 105. The cooling medium sent to 25 is blocked by the third three-way valves 27a and 27b, and the fifth return flow paths 38, 38a and 38b are closed by the fourth three-way valves 36a and 36b. As a result, the cooling medium circulates in the cooling medium circulation circuit C2 returned to the main tank 15 via the bypass passage passing through the main tank 15, the pump 105, and the bypass valve 101, and a part thereof further passes to the bypass valves 102a and 102b. The refrigerant is circulated through the cooling medium circulation circuit C2 returned to the main tank 22.

  Control valves 110a, 110b corresponding to the first control valve 32 in FIGS. 1, 2, and 3 are provided in the second supply passages 25a, 25b and the third supply passages 26a, 26b leading to the third three-way valves 27a, 27b. 111a and 111b are provided, and supply amounts of the cooling medium or the heating medium to the loads Wa and Wb are controlled in accordance with the set temperatures of the loads Wa and Wb, respectively. The operation of these control valves is the same as that of the first control valve 32 shown in FIGS.

  Here, instead of the relatively expensive third three-way valves 27a and 27b and the fourth three-way valves 36a and 36b, the control valve 110a is provided in each of the second supply channels 25a and 25b and the third supply channels 26a and 26b. 110b and 111a, 111b, which are driven in synchronization with each other, may be provided with valves for selectively supplying a cooling medium or a heating medium to the loads Wa, Wb, respectively.

  The heating and cooling device 100 is further provided with a heat retaining tank 112. The heat retaining tank 112 serves as a discharge port for replenishing the medium to the mixing tank 22 and discharging superheated gas generated in the mixing tank 22. The heat insulation tank 112 is surrounded by a heat insulation jacket 113, and a fourth heat exchanger 114 for exchanging heat with the medium in the heat insulation tank 112 is provided. Further, a mechanism for detecting the temperature of the medium in the heat retaining tank 112 by the temperature sensor Tc6 and controlling the supply of the primary cooling water by the valve 115 is also provided.

  As schematically shown in the upper right part of FIG. 4, the heating / cooling device 100 stores data such as the first and second temperature controllers 50 and 51 in the controller and the load device controller of the plastic molding machine as the load. The input and control of the cooler 14, the heater 24, each three-way valve and each control valve are the same as those shown in FIGS. Moreover, although only the example which supplies a medium to two load Wa and Wb was shown as a load, it cannot be overemphasized that it is good also as a single load W as shown in FIG.

  The cooling medium circulation circuit C2 and the heating medium circulation circuit C3 are closed circuits, and only the medium in the closed circuit needs to be cooled and heated, so that the cooler 14 and the heater 24 are continuously driven for a long time. If the temperature sensor is provided and the driving of the cooler 14 or the heater 24 is stopped when the temperature reaches the specified temperature, the medium can be cooled and heated in a short time with less energy. Similarly, when the load W is cooled or heated by the cooling / heating medium supply circuit C4, the cooler 14 or the heater 24 need not be continuously driven.

  In FIG. 5 showing still another embodiment of the present invention, the heating / cooling device 150 has the same configuration as that of the heating / cooling device 100 in FIG. 4 in the vicinity of the loads Wa and Wb. The heat-retaining tank 112 for supplying the refrigerant is discharged, and the medium is supplied from one main tank 151 to the cooling medium circulation circuit C2 and the heating medium circulation circuit C3. The mixing tank 153 having the heater 152 is also provided in the cooling medium circulation circuit C2. The seventh and eighth return channels 154 are connected to the bypass channel and the fifth return channel 38 passing through the bypass valve 101 and the bypass channel and the third supply channel 26 passing through the bypass valve 103 by a four-way joint. 155 (corresponding to the bypass cooling medium return flow path and the bypass heating medium return flow path, respectively).

  Third and fourth control valves 156 and 157 are provided in the seventh and eighth return flow paths 154 and 155, respectively. The opening and closing of the third control valve 156 is controlled according to the output of the temperature sensor Tc2 that detects the temperature of the cooling medium flowing through the second supply passage 25. The fourth control valve 157 is controlled to be opened and closed according to the output of the temperature sensor Tc1 that detects the temperature of the heating medium flowing through the third supply flow path 26. The flow resistance when the third and fourth control valves 156 and 157 are opened is set lower than the flow resistance of the bypass valves 101 and 103, and when the third and fourth control valves 156 and 157 are opened. The inflow of each medium to the seventh and eighth return flow paths 154 and 155 becomes more dominant than the bypass flow paths passing through the bypass valves 101 and 103.

  The third control valve 156 is opened when the output of the temperature sensor Tc2 (cooling medium temperature) becomes equal to or higher than a preset temperature. When the third control valve 156 is opened, the cooling medium flowing through the fifth return channel 38 flows into the seventh return channel 154 and is returned to the main tank 151. From the main tank 151, an amount of medium corresponding to the cooling medium returned through the seventh return channel 154 is supplied to the mixing tank 153. Thus, the temperature of the cooling medium in the cooling medium circulation circuit C2 is forcibly lowered by the medium supplied from the main tank 151 to the mixing tank 153. When the output of the temperature sensor Tc2 falls below a preset temperature, the third control valve 156 is closed again. Further, when the temperature is far below the set temperature, the heater 152 is driven.

  Similarly, the fourth control valve 157 is opened when the output (temperature of the heating medium) of the temperature sensor Tc1 is equal to or higher than a preset heating limit temperature. When the fourth control valve 157 is opened, the cooling medium flowing through the third supply channel 26 flows into the eighth return channel 155 and is returned to the main tank 151. From the main tank 151, an amount of medium corresponding to the heating medium returned through the eighth return flow path 155 is supplied to the mixing tank 22. As a result, the temperature of the heating medium in the heating medium circulation circuit C3 is forcibly lowered by the medium supplied from the main tank 151 to the mixing tank 22. When the output of the temperature sensor Tc1 falls below the preset heating limit temperature, the fourth control valve 157 is closed again.

  When temperature control of the mold of the plastic molding machine is performed using the heating / cooling device, the temporal change in the temperature of the medium supplied from the heating / cooling device to the mold and the temperature of the mold itself is shown in FIGS. 7 as shown in FIG. First, when a load device controller of a plastic molding machine requests a heating / cooling device to heat a mold as a load to a temperature of, for example, 140 to 200 ° C. for injection into a mold such as molten plastic. The heater 24 of the mixing tank 22 of the heating medium circulation circuit C3 is fully operated to 100%, and the medium of the heating medium circulation circuit C3 is much higher than the heating set temperature required by the load and near the heating limit temperature. Heated rapidly to 200-260 ° C. And when this heated heating medium is supplied to a metal mold | die and a metal mold | die is heated to the preset temperature of 140-200 degreeC, a molten plastic will be inject | poured in a metal mold | die.

  The heating of the mold by the heating / cooling device is performed in order to improve the fluidity of the molten plastic in the mold, and conditions suitable for filling the molten plastic into the mold, for example, 140 to 200 ° C. As long as an appropriate temperature range is satisfied at the temperature selected from the above, strict temperature control is not required. However, in order to meet the demand for shortening the cycle of the plastic molding process, the temperature of the medium is much higher than the heating set temperature (140 to 200 ° C.) required by the mold, that is, the trade name Galden, the trade name Fluorinert. The heating to the vicinity of the heating limit temperature (200 to 260 ° C.) of a fluorinated liquid medium (for example, the general formula perfluoropolyether represented by the following formula 5) is required.

  The mold cooling by the heating / cooling device is for solidification of the molten plastic in the mold, and the temperature is low enough for the molten plastic to be solidified in the mold, for example, a set temperature at room temperature. The mold is cooled down. Also, depending on the type of plastic molding, when injecting molten plastic into the mold, for example, when the mold is heated to a high set temperature of 140 to 200 ° C. and the plastic after injection is solidified, Attempts to shorten the plastic molding process by keeping the mold at a relatively high temperature by removing the solidified plastic by, for example, a robot while cooling only to a high temperature (up to 150 ° C) exceeding normal temperature. There is also. In any case, rapid cooling of the mold is necessary to reduce the cycle, but considering the maintenance due to condensation of the heating and cooling device and piping, the mold cooling set temperature (~ 150 ° C) It is preferable that the cooling temperature is set to 10 to 100 ° C. at which the dew condensation of the apparatus and the piping does not occur.

  Depending on the type of the machine or the type of plastic molded product, the plastic molding machine detects that the mold has reached the desired temperature and starts pouring molten plastic into the mold, while Some request to stop the supply of the heating medium to the mold. In addition, after detecting that the mold has reached the desired temperature and injecting molten plastic into the mold, the supply of the heating medium to the mold is maintained until a predetermined time has elapsed, and thereafter Some require that the heating / cooling device stop supplying the heating medium to the mold.

  The heating / cooling device receives a request to stop the supply of the heating medium to the mold from the load device controller of the plastic molding machine, stops the supply of the heating medium to the mold, and switches to the supply of the cooling medium, The supply of the cooling medium from the cooling medium circulation circuit C2 to the mold is started to cool the mold, and the molten plastic in the mold is solidified. In the plastic molding machine, the plastic molded product is taken out after the solidification is completed, and a heating medium supply request is made to the heating / cooling device for the next molding. By repeating these series of heating and cooling cycles, continuous plastic molding is performed.

  In the above-described cycle, in the heating medium circulation circuit C3 of the heating / cooling device, the runaway due to the failure of the heater 24 or the supply of the heating medium to the mold after the mold reaches the desired temperature as described above. By maintaining the temperature, the supplied heating medium may receive heat from the molten plastic, and the heating medium may be heated to exceed the heating limit temperature of 200 to 260 ° C.

  As described above, when the heating medium heated to near the heating limit temperature is further heated, it may be evaporated and disappear. If this happens, the medium is very expensive and economically disadvantageous. In addition, if a large amount of the medium evaporates, there is a risk of being harmful to the human body.

  In the heating / cooling device 150, the temperature of the heating medium flowing through the third supply flow path 26 is detected, and when it is detected that the temperature exceeds the heating limit temperature, the fourth control valve 157 is opened, A predetermined amount of the heating medium in the third supply flow path 26 is returned to the main tank 151, and a cooling medium corresponding to the amount of the returned heating medium is supplied from the main tank 151 to the mixing tank 22, so that the inside of the heating medium circulation circuit C3. Since the heating medium is forcibly and rapidly returned to the desired supply temperature, the heating medium heated to the vicinity of the heating limit temperature is further heated, and there is no possibility of evaporating and disappearing.

  Similarly, the temperature of the cooling medium flowing through the second supply flow path 25 is detected, and when it is detected that the temperature is higher than the set temperature, the third control valve 156 is opened to open the fifth return flow. The cooling medium in the path 38 is returned to the main tank 151 by a predetermined amount, and the cooling medium corresponding to the returned cooling medium is supplied from the main tank 151 to the mixing tank 153, and the cooling medium in the cooling medium circulation circuit C2 is supplied. Since the cooling is forcibly performed, the temperature of the cooling medium in the cooling medium circulation circuit C2 can always be kept at an optimum value. However, such a configuration in the cooling medium circulation circuit C2 is not indispensable, and may be configured only by a mechanism that mixes the cooling medium only with the heating medium of the third supply flow path 26.

  When opening / closing the third control valve 156, the output of the temperature sensor Tc3 that detects the temperature of the cooling medium flowing through the fifth return flow path 38 may be referred to instead of the output of the temperature sensor Tc2. Similarly, when opening / closing the fourth control valve 157, the output of the temperature sensor Tc4 that detects the temperature of the heating medium flowing through the fourth return flow path 37 may be referred to instead of the output of the temperature sensor Tc1. The seventh and eighth return channels 154 and 155 are connected to the fifth return channel 38 and the third supply channel 26, respectively, but the second supply channel 25 and the fourth return channel 37 side. The seventh and eighth return flow paths may be connected to each other.

  In the heating / cooling device 150, the cooler 14 is attached as an option, similarly to the heating / cooling device 100. The cooler 14 operates when the temperature of the medium in the main tank 151 is raised by the medium returned through the seventh and eighth return flow paths 154 and 155. In addition, the medium supplied from the main tank 151 to the mixing tank 22 of the heating medium circulation circuit C3 can be cooled by the primary cooling water via the fifth heat exchanger 158. Furthermore, when the cooling medium in the cooling medium circulation circuit C2 is excessively cooled, the heater 152 of the mixing tank 153 can be operated to heat the cooling medium.

It is a circuit diagram which shows schematic structure of the heating-cooling apparatus to which this invention is applied. It is a block diagram which shows the electrical structure of a heating-cooling apparatus. It is a circuit diagram which shows another embodiment of a heating-cooling apparatus. It is a circuit diagram which shows another embodiment of a heating-cooling apparatus. It is a circuit diagram which shows another embodiment of a heating-cooling apparatus. It is a graph which shows the time change of the temperature of the medium supplied to a metal mold | die from a heating / cooling apparatus. It is a graph which shows the time change of the temperature of a metal mold | die.

Explanation of symbols

2, 60, 100, 150 Heating / cooling device 13, 40, 108, 114, 158 1st to 5th heat exchanger 14 Cooler 15, 151 Main tank 16, 25, 26, 29, 41 1st to 5th supply Flow path 17, 23, 31, 37, 38, 42, 154, 155 First to eighth return flow paths 18 Common flow path 19, 28 First and second circulation pumps 20, 21, 27, 36 First to second 4 Three-way valve 22, 153 Mixing tank 24, 152 Heater 30 Bypass flow path 32, 45, 156, 157 First to fourth control valves 50, 51 First, second temperature regulator 52 Controller 53 Load device controller C1 Primary side Circuit C2 Cooling medium circulation circuit C3 Heating medium circulation circuit C4 Cooling / heating medium supply circuit C5 Primary cooling water circulation circuit W Load Tc Temperature sensor P Pressure gauge

Claims (4)

Heating / cooling for heating and cooling the load by switching the heating medium circulation circuit for supplying the medium set at high temperature to the load and returning it, and the cooling medium circulation circuit for supplying the medium set to low temperature and returning it to the load In the device
The medium can be heated in a liquid phase to a heating limit temperature of 200 ° C. or higher and can be cooled to 0 ° C. or lower.
The heating medium circulation circuit heats the medium until it reaches a temperature higher than the heating set temperature required by the load, a supply means for supplying the heated medium to the load, and returns the medium supplied to the load. Return means,
The cooling medium circulation circuit cools the medium until the temperature becomes lower than a cooling set temperature required by the load, a supply means for supplying the cooled medium to the load, and returns the medium supplied to the load. Return means,
A heating and cooling device that heats and cools a load by switching between the heating medium circulation circuit and the cooling medium circulation circuit according to a load request.   The heating unit heats the medium to near the heating limit temperature, and the heating medium circulation circuit detects a temperature of the medium heated by the heating unit, and the temperature detected thereby is heated. The heating / cooling device according to claim 1, further comprising a mixing unit that mixes the cooled medium with the heated medium and lowers the temperature when the temperature is equal to or higher than the limit temperature.   The heating and cooling device according to claim 1 or 2, wherein the cooling means cools the medium to a temperature that is 10 ° C or higher and lower than a cooling set temperature required by a load. The heating / cooling device according to any one of claims 1 to 3, wherein the medium is a perfluoropolyether of the general formula 1 shown below.

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