JP2011116057A - Temperature control system of molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature control system of a molding machine, capable of continuing operation under extremely high energy efficiency. <P>SOLUTION: The temperature control system of the molding machine 1 includes a molding machine with a hopper 2 storing starting materials and a mold 3 in which the starting materials are introduced, a fan introducing air into the hopper 2, a hot air inlet 40 provided at the hopper 2 in which the air is introduced, a waste gas outlet 44 from which the air is discharged, a heat exchanger for cooling the mold 3, a heat pump 4 which heats and supplies the air between the fan and the hot air inlet 40, a heat exchanger 34 for heating cooling water which heats the cooling water by the air from the waste gas outlet 44. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a temperature control system for a molding machine used in a resin molding process or the like.

The resin molding step includes a step of drying the molding material stored in the hopper of the molding machine with warm air and a step of cooling the mold of the molding machine with cold water. Conventionally, the former warm air has been produced by blowing air to an electric heater or a steam heater, and the latter cold water has been produced by a refrigerator. However, electric heaters, boilers and refrigerators are operated separately and are not efficient. In addition, the electric heater and the steam heater cannot be heated more than the input energy, and the amount of CO ₂ emission is large. Furthermore, the warm air after drying the molding material is released into the atmosphere and is not effectively used.

  Therefore, in order to increase the efficiency of the generation of cold water and hot air, a mold temperature control device using an exhaust heat recovery type heat pump (heat pump) that can simultaneously supply cold and hot heat has been proposed (FIG. 3 of Patent Document 1 below). Etc.). In this apparatus, heating of the heat medium that heats the air in the molding material dryer and cooling of the refrigerant body that cools the mold are performed by a heat pump.

Japanese Patent Laid-Open No. 2005-7736

However, in the resin molding step, the molding material is constantly dried, whereas the cooling of the mold is intermittently performed when the mold reaches a predetermined temperature or higher. If the hot air supply related to the drying is followed, surplus in the cold heat is generated and the balance between the cold heat supply and the hot heat supply is not achieved, and the operation of the heat pump cannot be continued. Also, even if efficiency and CO ₂ emissions are emphasized and cooling is followed, heat backup equipment is required separately, and as a result, it becomes unsatisfactory as a whole, or the balance between cooling and heating is not achieved, and the heat pump is operated. Suddenly stops.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a temperature control system for a molding machine that can continue operation with extremely good energy efficiency.

  In order to achieve the above object, the invention described in claim 1 is directed to a hopper that stores raw materials, a molding machine having a mold into which the raw materials are charged, a blower that sends air to the hopper, and a hopper. The heating medium in the provided inlet for receiving the air, the cooling means for cooling the mold, the air between the blower and the inlet, or the heating means for heating the air with a heating medium. A heat pump that heats and supplies the cooling means and supplies a cooling medium to the cooling means, and a cooling medium heating heat exchanger that heats the cooling medium with heat belonging to a factory. It is.

  In the present invention, the heat pump may directly heat the heating medium (supply of hot water or a heating refrigerant, etc.), or heat the heating medium with another heating medium (internal heating medium) that it owns. Also good. In the former case, the heating medium directly reaches the heating means. In the latter case, the internal heating medium is heated in the heat pump, and heat exchange between the internal heating medium and the heating medium is performed. Similarly, in the present invention, the heat pump may directly cool the cooling medium (supply of cold water or a cooling refrigerant, etc.) or cool the cooling medium by another cooling medium (internal cooling medium) held by itself. May be.

  In order to achieve the object of operating the heat pump which can be continued more efficiently and without waste in addition to the above object, the invention described in claim 2 is the above invention, wherein the air is discharged to the hopper. The cooling medium heating heat exchanger is characterized in that the cooling medium is heated by the air from the exhaust port.

  In order to achieve the object of continuing the operation of the heat pump in response to this even if the heating load, the cooling load, etc. fluctuate in addition to the above object, the invention described in claim 3 A heating amount adjusting means for adjusting a heating amount of the cooling medium in the cooling medium heating heat exchanger is provided.

  In order to achieve the object of continuing the efficient operation of the heat pump with a simple configuration in addition to the above object, the invention according to claim 4 is characterized in that, in the above invention, the heating amount adjusting means includes the cooling medium in the cooling medium. It is a heat exchange amount adjusting means for adjusting the amount of branching to the heat exchanger for cooling medium heating.

  In addition to the above-mentioned object, the invention according to claim 5 achieves the object of further improving energy saving by switching the operation state of the heat pump to an efficient state according to the process. The cooling medium supply set temperature in the heat pump is raised when the mold does not need to be cooled by the medium and the air needs to be heated.

  In addition to the above-mentioned object, the invention according to claim 6 makes it possible to pause the heat pump in a process in which existing equipment is effectively used, or backup related to cooling is performed, or a cooling-only machine is installed to perform only cooling. In order to achieve the purpose of further enhancing the energy saving performance, the present invention is characterized in that a cooling device for cooling the cooling medium is provided.

  In order to achieve the object of automatically setting the output of the heat pump appropriately in accordance with the heating load, in addition to the above object, the invention described in claim 7 is the temperature of the air after heating in the above invention, When at least one of the temperature of the hopper or the temperature of the heating medium falls outside a predetermined range, an automatic control device is provided that controls the output of the heat pump until at least one falls within a specific range. Is.

  In order to achieve the object of automatically making the output of the heat pump appropriate according to the cooling load in addition to the above object, the invention according to claim 8 is characterized in that, in the above invention, the temperature of the mold or the cooling When at least one of the temperature of the medium falls outside the predetermined range, an automatic control device is provided that controls the output of the heat pump until at least one of the temperature falls within the specific range.

  In addition to the above-mentioned object, the invention according to claim 9 achieves the object of automatically continuing the operation of the heat pump appropriately corresponding to the heating state and the cooling state. Automatic control for controlling the heating amount of the cooling medium until at least one of the temperature of the cooling medium or the temperature of the heat exchanger for heating the cooling medium is out of a predetermined range until at least one of the temperature is within a specific range. A device is provided.

  In addition to the above-mentioned object, the invention according to claim 10 achieves the object of enabling the operation of the heat pump to be continued by reducing the cooling load simply by controlling to reduce the heating load in the heat pump, thereby preventing overcooling and continuing the operation of the heat pump. In the invention, the automatic control device is characterized in that when the temperature of the cooling medium decreases, the heating amount in the heat pump decreases.

  In addition to the above object, the invention according to claims 11, 12 and 13 achieves the object of more easily reducing the heating amount. In the above invention, the automatic control device reduces the temperature of the cooling medium. Then, a heating medium pump that circulates the heating medium in a state where the amount of air before heating is reduced, the supply set temperature of the heating medium is reduced, or the amount of heat when returning to the heat pump is constant is provided. The automatic control device is characterized in that when the temperature of the cooling medium decreases, the supply set temperature of the heating medium increases.

  In addition to the above-mentioned object, the inventions according to claims 14 and 15 achieve the object of making effective use of existing equipment, performing a backup related to heating, or starting the heat pump easily in a state where continuous operation is possible. In the above-described invention, the apparatus further comprises another heat source for heating the cooling medium. After the cooling medium is heated by the other heat source, the heat pump is started or the cooling medium is heated by the air from the exhaust port. Then, the heat pump is started.

According to the present invention, the heating medium for generating the hot air related to the drying of the raw material and the cooling medium related to the cooling of the mold are collectively performed by the heat pump, and the exhaust air inevitably generated by using the hot air. The cooling medium is appropriately heated by the heat of the factory including the above. Therefore, it is possible to prevent overcooling by the heating and balance the cooling medium with respect to the heating medium, so that the heat pump can be operated in an extremely efficient and stable state and exhausted. Can be effectively utilized, and the power consumption and CO ₂ emission amount of the entire system can be reduced.

It is a block diagram of the temperature control system of the molding machine which concerns on the 1st form of this invention. It is a flowchart which shows the operation | movement which concerns on the warm air side control of the temperature control system of FIG. It is a flowchart which shows the operation | movement which concerns on the cold water side heating control of the temperature control system of FIG. It is a flowchart which shows the operation | movement which concerns on operation switching of the temperature control system of FIG. It is a block diagram of the temperature control system of the molding machine which concerns on the 2nd form of this invention. It is a flowchart which shows operation | movement of the temperature control system of FIG. It is a flowchart which shows operation | movement of the temperature control system of FIG. (A), (b) is a block diagram of the temperature control system of the molding machine which concerns on the 3rd form of this invention, (c) is a block diagram of the temperature control system of the molding machine which concerns on the 4th form of this invention. is there. It is a block diagram of the temperature control system of the molding machine which concerns on the 6th form of this invention. (A) is a block diagram of the temperature control system of the molding machine which concerns on the 8th form of this invention, (b) is a block diagram of the temperature control system of the molding machine which concerns on the 9th form of this invention. It is a flowchart which shows operation | movement of the temperature control system of Fig.10 (a). (A), (b) is a block diagram of the temperature control system of the molding machine which concerns on the 10th form of this invention.

  Hereinafter, an example of an embodiment according to the present invention will be described with reference to the drawings as appropriate. In addition, the said form is not limited to the following example.

[First form]
FIG. 1 is a schematic diagram of a temperature control system 1 for a molding machine according to a first embodiment. The temperature control system 1 is installed in a factory here as a raw material tank for storing molding materials (raw materials, pellets). And a molding machine (not shown) other than the two members and a waste heat recovery type heat pump (heat pump, HP) 4. In the factory, a cooler 6 and a cooling tower 8 connected thereto are installed. The temperature control system 1 may be formed by connecting the heat pump 4 to an existing molding machine having a heater K in the hopper 2.

  The heat pump 4 generates cold heat and simultaneously generates heat by using the exhaust heat generated at that time, and supplies the cold heat to the cooling medium as cold water and the hot heat to the air as hot air. Here, a heat pump type hot air generator capable of simultaneously supplying cold water of about 7 degrees (Celsius, the same applies hereinafter) to about 30 degrees and hot air of about 60 to 120 degrees is used. The heat pump 4 needs to balance these characteristics because hot air and cold water are supplied at the same time. In order to extract a large amount of high-temperature heat, the high-temperature heat is sufficiently absorbed into the air, and a large amount of cold heat is also extracted. It is necessary to get enough heat and return. In addition, as the heat pump 4, you may use what can supply hot water of a maximum of 90 degree | times.

  The heat pump 4 includes a blowing port 10 that supplies the generated warm air and an introduction port 12 that introduces base air to generate the warm air. The base air is heated by passing through the heat exchanger 14 of the heat pump 4 and becomes warm air. The base air that has passed through the heat exchanger 14 is heated by warm heat (heating refrigerant / heating medium) from the heat pump 4 in the heat exchanger 14. Note that a heating refrigerant (heating medium) is supplied to the heat pump 4 through a pipe or the like, and a heat exchanger 14 for heating the base air connected to the pipe or the like is connected to the outside of the heat pump 4 (a ventilation path 42 described later). ) May be installed.

  The heat pump 4 is connected to a chilled water supply pipe 20 for supplying the generated chilled water and a chilled water return pipe 22 for passing the returned chilled water, and these are for cooling (not shown) installed in the mold 3. A heat exchanger (cooling means) is connected. In addition, the cooler 6 is connected to a chilled water pipe 26 that supplies chilled water to the mold 3 and a chilled water receiving pipe 28 that receives chilled water from the mold 3. That is, here, the cold water side and the cooler 6 side of the heat pump 4 have independent mold 3 cooling circuits. Further, the circuit of the cold water supply pipe 20 to the cold water return pipe 22 includes a shortcut from the cold water supply pipe 20 to the cold water return pipe 22 as it is without introducing the cold water to the heat exchanger for cooling the mold 3. A valve (not shown) capable of switching the circuit between the heat exchanger side and the shortcut side is provided.

  Further, a branch water chilled water return pipe 30 is branched from the cold water return pipe 22, and a branch water chilled water return pipe 32 is joined to the cold water return pipe 22, which includes a heat exchanger for heating the cold water. 34 is connected. A control valve 36 as a heating amount adjusting means for adjusting the amount of heat (in this case, the flow rate) of the branching cold water is disposed at the branching portion of the cold water return pipe 22 and the heating branch cold water outgoing pipe 30.

  Further, the temperature control system 1 has a fan (not shown) as a blower that guides warm air to the ventilation path 42 extending from the air blowing port 10 to the warm air introduction port 40 of the hopper 2, and from the exhaust port 44 of the hopper 2. There is an exhaust passage 46 that passes through the heat exchanger 34 for heating cold water and reaches around the molding machine or outside the factory. The air introduced into the hopper 2 and exiting from the exhaust port 44 heats the cold water to the heat pump 4 in the cold water heating heat exchanger 34. The air before passing through the heat exchanger 14 is the base air, the air after passing through the heat exchanger 14 (after heating) is the hot air, and the air exiting from the exhaust port 44 (the air in the exhaust passage 46) is exhausted. Alternatively, exhaust air is used. Further, a dedicated blower (exhaust device) may be provided in the exhaust passage 46.

  The temperature control system 1 includes various devices such as a heat pump 4 and a cooler 6 and an automatic control device (not shown) that controls various valves. The automatic control device includes temperatures of cold water and hot air (not shown). Various sensors for detecting the flow rate (heat amount) are electrically connected. The automatic control device may be a single independent device, may be built in a heat pump or the like, may be distributed in various devices, or may be a device control device. You may also serve.

  Such a temperature control system 1 operates as described below.

  The automatic control device mainly controls the hot air side of the heat pump 4 by the processing shown in FIG. 2 (warm air side control circuit), and mainly controls the heat exchange on the cold water side of the heat pump 4 by the processing shown in FIG. (Chilled water side heat exchange control circuit), the switching between the heat pump 4 side and the cooler 6 side is controlled mainly by the processing shown in FIG. 4 (operation switching circuit). Note that these processes may be executed in parallel or sequentially.

  In the hot air side control circuit shown in FIG. 2, the automatic control device first determines whether or not there is a drying operation command in the hopper 2 (step S1, hereinafter simply referred to as “S1” or the like). YES), the heat pump 4 is activated to generate hot air (S2), and if it does not exist (NO), the process is terminated. Examples of the case where the operation command exists include a case where a material is put into the hopper 2 and a case where the material in the hopper 2 exceeds a predetermined amount.

  After the generation of hot air (S2), the automatic control device determines whether or not a predetermined drying time (for example, 2 to 4 hours with ABS resin) has not been reached, based on the state of the timer that is reset when the drying operation command is generated. (S3). If the drying time has been reached (NO), the automatic control device stops the heat pump 4 and terminates the process (S4). If the drying time has not been reached (YES), the hot air temperature Th1 is the material drying set temperature. It is grasped by a temperature sensor provided in the air passage 42 whether or not it has become lower than a predetermined temperature (for example, 5 degrees) from Th2 (for example, 80 degrees Celsius (hereinafter the same) for ABS resin) (S5).

  If the automatic control device determines YES in S5, the temperature of the hot air generated by the heat pump 4 so that the hot air temperature Th1 is within a specific range including the material drying set temperature Th2 (for example, within 2 degrees each in the vertical direction). Loop 1 relating to the process (S6) for gradually increasing the hot air temperature Th1 is executed, and the process returns to S3. The hot air temperature Th1 is raised by the increase in the output of the heat pump 4. The automatic control device determines whether the hot air temperature in the ventilation path 42, the temperature in the hopper 2 or a combination thereof is within a predetermined range instead of or together with the hot air temperature Th1, or a specific range. You may control so that it may fit in.

  On the other hand, if the automatic control device determines NO in S5, it determines whether or not the hot air temperature Th1 has become higher than the material drying set temperature Th2 by exceeding a predetermined temperature (for example, 5 degrees, which may be an absolute value different from S5). Grasp (S7). If the automatic control device determines YES in S7, the loop 2 relating to S8, which is the same as S6 except that the hot air temperature is not lowered but processed, returns to S3, and if NO is determined in S7, S3 continues. Return to. Note that the specific range for completing the loops 1 and 2 is any range regardless of the above example as long as it is within a predetermined range (S5, S7) for determining whether to execute the loops 1 and 2. It may be. In addition, the specific ranges of the loops 1 and 2 may be different from each other.

  In the cold water side heat exchange control circuit shown in FIG. 3, the automatic controller first determines whether or not there is an operation command (the heat pump 4 is activated) (S11), and if not (NO) When the process is finished and there is (YES), it is determined whether or not the chilled water temperature Tc1 of the heat pump 4 is lower than the chilled water set temperature Tc2 by a predetermined temperature (for example, 3 degrees) (S12). The cold water set temperature Tc2 is, for example, 20 degrees when the mold 3 is cooled and 40 degrees when the mold 3 is not cooled.

  When the automatic control device determines YES in S12, it executes a loop 3 in which the chilled water temperature Tc1 is within a specific temperature (for example, within 1 degree above and below) by gradually increasing the chilled water temperature (S13). After completion, the process returns to S11. The chilled water temperature Tc1 is controlled by the control valve 36 so that the flow rate toward the chilled water heating heat exchanger 34 is increased, and is heated by the exhaust of the hopper 2 (for example, 75 degrees) in the chilled water heating heat exchanger 34. The amount is increased by increasing the amount (the amount of heat exchange between cold water and exhaust).

  On the other hand, if the automatic controller determines NO in S12, it is determined whether or not the chilled water temperature Tc1 of the heat pump 4 is higher than the chilled water set temperature Tc2 by a predetermined temperature (for example, 3 degrees, which may be an absolute value different from S12). Determine (S14). If it is determined YES in S14, the automatic control device executes a loop 4 in which the chilled water temperature Tc1 is within a specific temperature including the chilled water set temperature Tc2 (for example, within 1 degree above and below) by gradually lowering the chilled water temperature (S15). . The chilled water temperature Tc1 is squeezed so that the flow rate to the chilled water heating heat exchanger 34 side of the control valve 36 is reduced, and the amount of chilled water heated by the hopper 2 exhaust (the chilled water and exhaust It is lowered by reducing the amount of heat exchange). If the automatic control device determines NO in S14, it returns to S11 as it is. The automatic control device determines whether the temperature outside or inside the mold 3 or the temperature inside or outside the cold water heating heat exchanger 34 is within a predetermined range instead of or together with the cold water temperature Tc1. It may be determined or controlled so as to be within a specific range. The specific range for completing the loops 3 and 4 is any range as long as it is within a predetermined range (S12, S14) for determining whether to execute the loops 3 and 4 regardless of the above example. The loops 3 and 4 may be different from each other.

  Further, in the operation switching circuit shown in FIG. 4, the automatic control device first determines whether or not the mold 3 needs to be cooled (is a cooling step in the resin molding step) (S21). If cooling is necessary (YES), the presence / absence of a drying operation command is checked (S22).

  If there is an operation command (YES), the automatic control device determines whether or not the heat pump 4 is operating (S23). Only when the heat pump 4 is not in operation (NO), the heat pump 4 and the fan are activated to generate hot air (S24), and in any case, the process proceeds to S25 to set the cold water supply set temperature of the heat pump 4 to the set temperature during mold cooling. Set to Tk1 (for example, 20 degrees). Then, if the cooler 6 is in operation (YES in S26), the automatic control device stops the cooler 6 (S27), and returns to S21 anyway. That is, if there is a drying operation command and cooling of the mold 3 is necessary, the automatic control device sets the cold water supply set temperature to the mold cooling set temperature Tk1 for cooling the mold 3. Switch to the side.

  On the other hand, if there is no drying operation command (NO in S22), the automatic control device determines whether or not the heat pump 4 is in operation (S28). If it is in operation (YES), the heat pump 4 and the fan are stopped. In any case, the process proceeds to S30. In S30, if the cooler 6 is not in operation (NO), the cooler 6 is started (S31), and in any case, the cold water supply set temperature of the cooler 6 is set to the mold cooling set temperature Tk1 (S32). ), Return to S21. That is, if there is no drying command, the automatic controller switches the cold water supply set temperature to the cooler 6 side set to the mold cooling set temperature Tk1 for cooling the mold 3.

  On the other hand, if the cooling of the mold 3 is not required (NO in S21), the automatic control device stops the cooling machine 6 if it is in operation (YES in S33) (S34), and in any case is a drying operation. The presence or absence of a command is checked (S35). If there is no such instruction (NO), the process is terminated, and if there is (YES), the heat pump 4 is activated only when the heat pump 4 is stopped (NO in S36, S37), and the cold water supply set temperature of the heat pump 4 is set to the non-die The cooling set temperature Tk2 (for example, 40 degrees) is set (S38), and the process ends. That is, the automatic control apparatus operates the heat pump 4 for drying when there is a drying operation command but the mold 3 is not cooled, but the cold water supply set temperature is higher than the mold cooling set temperature Tk1. Set to the mold non-cooling set temperature Tk2. The automatic control device switches the cold water circuit so that the cold water is circulated to the heat pump 4 without being led to the heat exchanger for cooling the mold 3.

The temperature control system 1 described above includes a hopper 2 in which raw materials are stored, a molding machine having a mold 3 in which the raw materials are charged, a fan that sends air to the hopper 2, and the air provided in the hopper 2. The hot air inlet 40 to be received, the exhaust port 44 for discharging the air, the cooling heat exchanger for cooling the mold 3, and the air between the fan and the hot air inlet 40 are heated and supplied. In addition, a heat pump 4 that cools and supplies cold water to the cooling heat exchanger and a cold water heating heat exchanger 34 that heats the cold water by the air from the exhaust port 44 are provided. Therefore, the heating for generating the hot air for drying the hopper 2 from the air and the cooling of the cold water for cooling the mold in the molding process can be efficiently performed by the common heat pump 4, and further the cold water is supplied to the hopper. Heating with the exhaust air of 2 does not cause excessive cooling of the chilled water even if it follows the heating load of the air, which is larger than the cooling load of the mold 3, and the heat pump 4 loses the balance between cold and hot heat. Therefore, the operation of the heat pump 4 can be continued and the operation can be continued very efficiently by the effective use of exhaust gas. And by such temperature adjustment with good efficiency and high energy saving, it is possible to effectively suppress power consumption and CO ₂ emission.

  Further, the temperature control system 1 includes a heating amount adjusting means for adjusting the amount of heating of the cold water in the cold water heating heat exchanger 34, and a control valve 36 for adjusting the amount of branching to the cold water heating heat exchanger 34. Have as. Therefore, the heating amount of the cold water can be appropriately controlled by a simple configuration of adjusting the branch amount, and even if the heating load, the cooling load or the like fluctuates, the operation of the heat pump 4 corresponding to this is continued. be able to.

  Furthermore, when the temperature adjustment system 1 does not require cooling of the mold 3 with the cold water and the air needs to be heated (NO in S21, YES in S35), the supply temperature of the cold water in the heat pump 4 is set. It is raised by the automatic control device (S38). Therefore, when only the heating load is generated, the temperature setting on the cold water side of the heat pump 4 is raised from the mold cooling set temperature Tk1 to the mold non-cooling set temperature Tk2, so that the heat pump 4 has a low cold water supply temperature setting. It is possible to provide a temperature control system 1 that can be operated in a more efficient state than the above and that is more efficient.

  Furthermore, since the temperature control system 1 includes the cooler 6 that cools the cold water, when there is no heating load and there is a cooling load, the heat pump 4 is not started and the cooling-only cooler 6 can be used. However, when the cooling load temporarily becomes excessive, the heat pump 4 can be backed up by operating the cooler 6.

  In addition, when the temperature of the hopper 2 falls outside a predetermined range (5 degrees above and below the set temperature), the temperature control system 1 outputs the output of the heat pump 4 until the temperature falls within a specific range (2 degrees above and below the set temperature). Since the automatic control device to control is provided, the output of the heat pump 4 can be automatically made appropriate according to the heating state.

  Moreover, since the temperature control system 1 includes an automatic control device that controls the output of the heat pump 4 until the temperature of the cold water falls outside the predetermined range, the temperature control system 1 outputs the output of the heat pump 4 according to the cooling state. It can be automatically appropriate.

  Further, when the temperature of the cold water falls outside a predetermined range, the temperature adjustment system 1 controls the amount of heating of the cold water (adjusts the amount of branching to the cold water heating heat exchanger 34 until it falls within a specific range. Since the automatic control device that controls the control valve 36) is provided, the heating to the cold water returning to the heat pump 4 can be automatically and appropriately adjusted according to the increase or decrease of the cooling load. The operation of the corresponding heat pump 4 can be automatically continued.

[Second form]
FIG. 5 is a schematic diagram of the temperature control system 51 of the molding machine according to the second embodiment, and the configuration of the temperature control system 51 does not use a cooler (or a cold water feed pipe or a cold water receiving pipe) or a cooling tower. Further, this embodiment is the same as the first embodiment and the modified example except that a damper 52 capable of switching the hot air (ventilation path 42) from the hopper 2 side to the outside of the molding machine (for example, a factory exhaust pipe) is installed.

  Such a temperature control system 51 operates in the same manner as in the first embodiment, and also operates as described below.

That is, as shown in FIG. 6 to FIG. 7, the automatic control device, when a drying signal (drying operation command) is present (YES in S50) and the drying time is not reached (YES in S51), the damper 52 is moved to the hopper. If it is not the 2 side, the hopper 2 side is set (NO in S52, S53), and if the fan is not in operation, it is operated (NO in S54, S55). Then, the fan air volume is set to a predetermined value such as 25 cubic meters per minute (m ³ / min) (S56), and if the operating state of the heat pump 4 is not the hot air control mode, the mode is set (NO in S57, S58), and gold If there is a mold cooling signal, the chilled water supply set temperature Tc2 in the chilled water supply pipe 20 of the heat pump 4 is set to a predetermined value (7 degrees) (YES in S59, S60), and if not, the chilled water supply set temperature Tc2 is set to 30 degrees (S59). NO, S61).

  Next, the automatic control device performs the control of the cold water temperature and the control of the hot air temperature at the same time. That is, if the actual cold water temperature Tc1 in the cold water supply pipe 20 of the heat pump 4 is not within a predetermined range (for example, within 3 degrees above and below) including the cold water supply set temperature Tc2 (NO in S62), FIG. Processing similar to S12-15 (Loop 3, Loop 4) is executed (cold water side heat exchange control circuit), and the hot air temperature Th1 is within a predetermined range (for example, within 5 degrees above and below) including the material drying set temperature Th2. If not (NO in S63), processing similar to S5 to S8 (loop 1, loop 2) in FIG. 2 in the first embodiment is executed (warm air side control circuit).

  If YES in S62, S63, or when processing related to the cold water side heat exchange control circuit or the hot air side control circuit is completed, the process proceeds to S64. In S64, the automatic control device checks whether the chilled water temperature Tc1 and the hot air temperature Th1 are within the predetermined ranges, respectively. If both are within the ranges, the process returns to S51, and either of them must be within the range. For example, S62 and S63 are executed again.

  On the other hand, if the automatic control device determines NO in S50 or S51, the automatic control device proceeds to S70 (FIG. 7). In S70, the presence / absence of a mold cooling signal (necessity of cooling of the mold 3) is checked. If not (NO), it is determined that the hot air for drying is unnecessary in S50 and S51. Confirmation (S71), if it is stopped (YES), the operation of the heat pump 4 and the fan is stopped (S72, S73) and the damper 52 is switched to the hopper 2 side (S74). NO) returns to the beginning of the process.

Further, when it is determined YES in S70, the automatic control device executes processing related to cooling of the mold 3. That is, first, when the heat pump 4 is not in the cold water control mode, the heat pump 4 is set to the mode (NO in S75, S76), and if the direction of the damper 52 is not the atmosphere side (external side), the direction is set to the atmosphere side (NO in S77). , S78), if the fan is not in operation, the fan is operated (NO in S79, S80). Then, the automatic control device sets the fan air volume to a specific amount (for example, 133 m ³ / min) larger than the predetermined amount (S81), and sets the cold water supply set temperature Tc2 of the heat pump 4 to the specific value (7 (S82), and it is confirmed whether the cold water temperature Tc1 is within a predetermined range (within 3 degrees above and below) including the cold water supply set temperature Tc2 (S83). The automatic control device determines whether the temperature inside or outside the mold 3 is within a predetermined range instead of or together with the cold water temperature Tc1, or controls the temperature to be within the predetermined range. good.

  If the automatic control device determines YES in S83, it returns to the beginning and continues processing. On the other hand, when the automatic control device determines NO in S83, the automatic control device performs control to adjust the chilled water temperature Tc1 by increasing or decreasing the output of the heat pump 4 (chilled water temperature adjusting circuit). Since no warm air is generated due to NO in S50 and S51, the heat pump 4 is operated for cooling, and the heat generated by the cooling is taken away by the air through the hot water, and the heat is received by the heat. The winded air is released to the atmosphere via the damper 52.

  That is, when the chilled water temperature Tc1 of the chilled water supply pipe 20 is lower than the chilled water set temperature Tc2 by a predetermined value (3 degrees) or lower (YES in S84), the automatic control device decreases the output of the heat pump 4 to reduce the chilled water temperature. Tc1 is gradually increased so that the cold water temperature Tc1 falls within a specific range (for example, 1 degree above and below the cold water supply set temperature Tc2) (S85, loop 5). If the chilled water temperature Tc1 exceeds the chilled water supply set temperature Tc2 by a predetermined value (3 degrees, may be an absolute value different from S84) (NO in S84, YES in S86), the output of the heat pump 4 is increased. Thus, the chilled water temperature Tc1 is gradually lowered so that the chilled water temperature Tc1 falls within a specific range (may be the same as or different from the loop 5) (S87, loop 6). In either case, the process returns to the beginning. The specific range for completing the loops 5 and 6 is any range regardless of the above example as long as it is within a predetermined range (S84, S86) for determining whether to execute the loops 5 and 6. It may be.

The power consumption and CO ₂ emission amount of such a temperature control system 51 and the conventional method will be described. Here, in the conventional method, only the electric heater is used for drying the hopper, while only the same cooler and cooling tower as in the first embodiment are used for cooling the mold. In any case, the air flow during drying is 25 m ³ / min, and the mold cooling load is 20 kilowatts per hour (kW / h). Furthermore, in any case, regarding the appearance rate of each step, “dry and mold cooling”: “dry only”: “only mold cooling” = 2: 7: 1, and the operating time is 16 hours per day, Also, 250 days per year. In addition, in the conventional method, the capacity of the electric heater for heating 20 degrees air to 80 degrees warm air (exhaust is 75 degrees) is 30 kW, and cooling water is cooled from 12 degrees to 7 degrees The COP (Coefficient of Performance, efficiency) of the cooler is set to 3.0.

On the other hand, in the temperature control system 51, in the case of “dry and mold cooling”, the air of 20 degrees is heated to 80 degrees hot air (the exhaust is 50 degrees) and the cold water is cooled from 12 degrees to 7 degrees. When the heat COP of the heat pump 4 is set to 3.0, the cooling COP is set to 2.1, and “drying only”, air at 20 degrees is heated to warm air at 80 degrees (with this, The heating COP of the heat pump 4 is set to 3.5, and the cooling COP is set to 2.7. The temperature of the return chilled water from 35 degrees to 30 degrees is raised to 35 degrees by heat exchange with the exhaust, and the exhaust is 50 degrees. In the case of “mold cooling only”, the cooling water is cooled from 12 degrees to 7 degrees (with this, 20 degrees air becomes 30 degrees warm air, the warm air is released to the atmosphere side via the damper 52 The cooling COP of the heat pump 4 is 3.0 (no heating COP) That. In any case, the factory temperature is an average of 20 degrees per year, and CO ₂ basic unit (refer to Chubu Electric Power Co., Inc. 2008 CO ₂ emission factor) is 0.455 kilograms (CO ₂ ) per kW (kg-CO ₂ / kW).

First, regarding the process requiring “dry and mold cooling”, in the conventional method, as shown in the following [Table 1], the power consumption on the dry side is 6.0 kWh, 24112 kW, and the annual CO ₂ emission amount is 11.0. ton (ton) is -CO _2, 5333kW year power consumption for cooling side 1.3KWh, an annual CO ₂ emissions 2.4ton-CO _2, total annual power consumption is 29445KW, total CO ₂ emissions the amount is 13.4ton-CO _2. On the other hand, in the temperature control system 51, as shown in the following [Table 2], the power consumption is 2.0 kWh on the dry side and 8037 kW year, the annual CO ₂ emission amount is 3.7 ton-CO ₂ , and the cooling side is The power consumption is 0 kWh, 0 kW year, the annual CO ₂ emission amount is 0 ton-CO ₂ , the annual total power consumption is 8037 kW, and the total CO ₂ emission amount is 3.7 ton-CO ₂ . In addition, about the cooling side, in the heat pump 4, since the exhaust heat (cold heat) in the drying side is utilized, power consumption etc. become zero.

Next, with respect to processes that require “drying only”, in the conventional method, as shown in the following [Table 3], power consumption is generated only on the drying side, power consumption is 21.1 kWh, 84391 kW year, annual CO ₂ emission the amount is 38.4ton-CO _2. On the other hand, in the temperature control system 51, as shown in [Table 4] below, power consumption is generated only on the dry side, the power consumption is 6.1 kWh and 24380 kW year, and the annual CO ₂ emission amount is 11.1 ton-CO. ₂ .

Subsequently, with respect to processes that require “mold cooling only”, in the conventional method, as shown in the following [Table 5], power consumption or the like occurs only on the cooling side, power consumption is 0.7 kWh, 2667 kW, and annual CO 2 ₂ emissions is 1.2 ton-CO _2. On the other hand, in the temperature control system 51, as shown in [Table 6] below, power consumption or the like is generated only on the cooling side, the power consumption is 0.7 kWh, 2667 kW, and the annual CO ₂ emission amount is 1.2 ton-CO. ₂ .

When the above is totaled, as shown in the following [Table 7], in the conventional method, the annual power consumption is 116502 kW and the annual CO ₂ generation amount is 53.0 ton-CO ₂ , whereas the temperature control system 51 , The annual power consumption is 35083 kW and the annual CO ₂ generation amount is 16.0 ton-CO ₂ , both of which are reduced by about 70% compared to the conventional method, reducing 81419 kW of power and 31.0 ton of CO ₂ annually. be able to.

Since the temperature control system 51 of the second embodiment described above is the same as that of the first embodiment, heating and cooling are appropriately executed in a very efficient state and the exhaust gas is effectively used (automatic operation). Ii) can be continued, and the power consumption and CO ₂ emission can be extremely effectively suppressed as described above.

  Moreover, since the temperature control system 51 does not include a cooler and cools the mold 3 only by the heat pump 4, it is not necessary to introduce a cooler at the time of new installation including renewal of the cooler, and the initial introduction cost. And maintenance costs are eliminated. Furthermore, since it has a damper 52 for switching the air that has passed through the heat exchanger 14 to the hopper 2 side and the outside (atmosphere) side, it can be switched to the hopper 2 side to cope with drying in the hopper 2 and to the outside side. When the operation of the heat pump 4 is continued only for cooling by switching, the heat generated from the heat pump 4 can be released.

[Third embodiment]
FIG. 8A is a schematic diagram of the temperature control system 101 of the molding machine according to the third embodiment. The temperature control system 101 includes a blow-by bypass valve 102 instead of a damper, and heat from another heat source N. The second heat source heat exchanger 104 is provided in the ventilation path 42 except for the second embodiment and the modification. The other heat source N is, for example, an electric heater, and the other heat source heat exchanger 104 further heats the warm air in the ventilation path 42 by heat exchange. It should be noted that the exhaust from the hopper 2 may not be heat exchanged with the cooling side (released to the outside).

  Such a temperature control system 101 operates in the same manner as in the second embodiment, and also operates as described below.

  The automatic control device adjusts the discharge hot air temperature by controlling the output of the heat pump 4 based on a signal from a sensor (not shown) that grasps the hot air temperature. In addition, the automatic control device monitors the chilled water temperature by a signal from a sensor (not shown) that grasps the chilled water temperature, and the cold heat changes (the chilled water temperature decreases) due to the fluctuation (reduction) of the cooling load. Monitor the balance of cold water supply.

For example, when the automatic control device determines that the supply of cold water is balanced, as shown in FIG. 8A, the air blow bypass valve 102 is switched to the heat pump 4 side and the base air of 15 degrees is 10 m ^3. / Min is sucked into the heat pump 4, and hot air having the same amount and set temperature (80 degrees) is supplied to the hopper 2 by heating at 13 kW. Here, the heating of the warm air by the other heat source N is 0 kW, that is, no additional heating is performed. In addition, the cold water load at this time is 8.7 kW, the cold water going temperature is 7 degrees, and the cold water return temperature is 17 degrees.

On the other hand, the automatic control device detects the temperature of the return or return chilled water (the temperature has fallen below the predetermined temperature (15 degrees), for example, the chilled water return temperature has changed from 17 degrees to 12.7 degrees), If it is determined that the balance of the cold water load (decreased to 5 kW) with respect to the wind load is lost, as shown in FIG. 8B, a part of the base air is branched to the air passage 42 side by the blower bypass valve 102, and then to the heat pump 4. The air flow rate is reduced (from 10 m ³ / min to 5.7 m ³ / min). In order to maintain the warm air set temperature, the heat pump 4 restricts the output on the hot air side, and accordingly, also restricts the cold side. By reducing the cooling output, it is possible to maintain a balance with the thermal load while corresponding to the reduced cooling load. However, since the heating amount of the base air by the heat pump 4 decreases (the branched base air is mixed with the warm air and the warm air becomes 52 degrees at 10 m ³ / min), the final heat adjustment by the other heat source N (5.6 kW), and the hot air temperature (the amount of heat of the hot air) is maintained at 80 degrees.

  When the cooling load increases after the state shown in FIG. 8B and the chilled water temperature becomes equal to or higher than the specific temperature (20 degrees), the automatic control device gradually narrows the branch side of the blower bypass valve 102. Increase the amount of base air blown to the heat pump 4. Then, the heating amount of the base air that maintains the discharge hot air temperature by the heat pump 4 increases, and the cooling heat also increases as the heating amount increases, so that it is possible to cope with the increased cooling load by adjusting the blowing amount.

Since the temperature control system 101 of the third embodiment described above is the same as the second embodiment, it is not necessary to introduce a cooler, and the operation is continued while appropriately performing heating and cooling in a highly efficient state. As described above, power consumption and CO ₂ emission can be suppressed extremely effectively.

  Further, the temperature adjustment system 101 adjusts the thermal load by adjusting the introduction amount of the base air to the heat pump 4, thereby controlling the cooling load, while reducing the heat amount of the hot air due to the change in the introduction amount of the base air. Since it has the other heat source N to supplement, it can respond to the fluctuation | variation of a cooling load simply and reliably by the simple structure of installing the ventilation bypass valve 102 of base air.

[Fourth form]
FIG. 8C is a schematic diagram of the temperature control system 121 of the molding machine according to the fourth embodiment, and the temperature control system 121 circulates a part of the exhaust from the hopper 2 as (a part of) the base air. The third embodiment and the modified example are the same except that the circulation method is used.

  Even in such a temperature control system 121 of the fourth form, as in the third form, by increasing / decreasing the amount of air blown to the heat pump 4, the supply balance of the heat and cold in the heat pump 4 is maintained and the operation is performed. While allowing continuation, it is possible to easily and appropriately cope with an increase or decrease in cooling load.

[Fifth embodiment]
The temperature control system for a molding machine according to the fifth embodiment is configured by removing the blower bypass valve 102 from the third embodiment. When the automatic control device determines that the cold water temperature has dropped, it instructs the heat pump 4 to lower the discharge hot air temperature. In response to this command, the heat pump 4 decreases the heating amount without changing the introduction amount of the base air, and accordingly, the cooling amount in the heat pump 4 also decreases, corresponding to the decrease in the chilled water temperature resulting from the decrease in the cooling load. It becomes possible.

For example, the base air of 15 degrees is heated at 10 m ³ / min with the heat of 13 kW by the heat pump 4, and warm air is supplied to the hopper 2 without heating the other heat source N at 80 degrees. At this time, if the cold load is 8.7 kW, it is balanced, but if it is lowered to 5 kW, the cold water temperature is changed from 17 degrees to 12.7 degrees, and below 15 degrees. The automatic controller instructs the heat pump 4 to set the discharge hot air temperature to 52 degrees, and the heat pump 4 changes the heating amount from 13 kW to 7.4 kW based on this. The value of the discharge hot air temperature to be changed is determined by the automatic control device depending on the cooling load or the chilled water temperature. Then, the amount of cooling of the heat pump 4 also decreases, and the decreased amount of cooling and the cooling load are balanced so that the operation of the heat pump 4 can be continued. Note that the value of the discharge hot air temperature can be determined by the characteristics of the apparatus such as the degree of the cooling amount that decreases as the discharge hot air temperature decreases. Further, securing the balance of the cooling load by adjusting the discharge hot air temperature can also be adopted in the circulation system as in the fourth embodiment.

  Even in such a temperature control system of the fifth embodiment, as in the third embodiment, while maintaining the supply balance of heat and cold in the heat pump 4 and allowing the operation to continue, the cooling load can be easily increased and decreased. It is possible to respond appropriately, and it is possible to maintain the supply balance between hot and cold by a simple method of changing the setting of the discharge hot air temperature.

[Sixth form]
As shown in FIG. 9, the temperature control system 151 of the molding machine according to the sixth embodiment is provided with a heat pump 154 that heats the return hot water and supplies the hot water instead of the heat pump 4 that sucks the base air and generates the warm air. Except for this, it is the same as the fifth embodiment. The heat pump 154 is connected to a hot water supply pipe 160 and a hot water return pipe 162, and a heat exchanger 164 (heating means) that performs heat exchange between the hot water and the base air is connected to these pipes. The base air is heated by passing through the heat exchanger 164, is appropriately heated by another heat source N, and is supplied to the hopper 2 as hot air. The hot water return pipe 162 is provided with a hot water pump 166 (heating medium pump) that circulates hot water at a constant speed.

The automatic control device, for example, introduces a base air of 15 degrees at 10 m ³ / min into the heat exchanger 164 to obtain a hot air of 70 degrees. The warm air is further heated to 80 degrees by another heat source N (heating load 2 kW). While warm water for heating the base air is 80 degrees and 70 degrees return (heating load 11 kW, COP 2.0), cold water is also generated at 7 degrees and 17 degrees return with this warm water supply, and cooling load 5. Acts in a balanced state (just as cold is used) for 5 kW. The automatic controller monitors the hot air temperature in the ventilation path 42 (immediately after the heat exchanger 164) between the heat exchanger 164 and the other heat source N, and supplies hot water to the heat pump 154 so that the temperature becomes 70 degrees. Control (warm water 80 degrees).

  Then, the automatic control device monitors the cold water temperature, and when the cooling load is reduced to 4.6 kW (COP 2.0) and the cold water temperature becomes a predetermined temperature or lower, the hot water supply set temperature of the heat pump 154 is set to 80. Decrease from 60 degrees to 60 degrees. Then, the heating amount of the heat pump 154 is reduced to 7 kW (COP 3.0), hot air of 50 degrees is generated from the base air, and the cold heat applied to the cold water is reduced, so that the cold water return temperature returns to a predetermined temperature or higher. (15.7 degrees), the balance of heat and cold is maintained. The warm air is heated by another heat source N at a heating amount of 6 kW so that the desired hopper 2 has 80 degrees.

  Note that the heat pump 154 may be operated following the hot water temperature (for example, desired hot air temperature +5 degrees), and even in this case, the amount of cold heat can be reduced by lowering the hot water temperature set value. Further, even if the flow rate of the hot water pump 166 is reduced by an inverter while keeping the hot water supply temperature constant, the heating amount is lowered and the cold heat amount is lowered. In addition, such cooling control of the heat pump 154 can be similarly executed in the hot air circulation system as in the fourth embodiment, and various technologies related to the heat pump according to another application by the present applicant (Japanese Patent Application No. 2009). -261206 “Electrodeposition coating device”, Japanese Patent Application No. 2008-305017 “Paint drying device”, Japanese Patent Application No. 2009-193528 “Air conditioning system”, Japanese Patent Application No. 2009-129380 “Medium temperature control system”). is there. These modified examples can also be employed in other embodiments (seventh to tenth embodiments).

  Even in the sixth embodiment of the temperature control system 151, as in the fifth embodiment, the operation balance can be continued by maintaining the supply balance between the heat and cold in the heat pump 154 by a simple method.

[Seventh form]
The temperature control system of the molding machine according to the seventh embodiment is the same as that of the sixth embodiment. The automatic control device performs a constant heat amount operation having a heat amount for generating a predetermined hot air temperature instead of the constant flow rate operation for the hot water pump 166. The hot water pump 166 automatically adjusts the flow rate of the hot water in order to keep the amount of heat constant.

For example, the basic air of 15 degrees at 10 m ³ / min is heated to 60 degrees by heating 9 kW (COP 2.5, hot water flow 70 degrees) by the heat exchanger 164, and the cooling load is 5.4 kW (COP 1.5). (Cold water going forward 7 degrees, returning 17 degrees). The hot water pump 166 is operated so as to have a hot water heat amount such that the hot air temperature is 60 degrees with respect to the hot water circulation amount.

  Then, when the cooling load is reduced to 4.5 kW and the chilled water temperature becomes 15 degrees or less, the automatic control device raises the hot water supply set temperature of the heat pump 154 to 80 degrees (warm water temperature going back 80 degrees / return 70 degrees). At this time, since the hot water pump 166 continues to operate at a constant amount of heat, the heating COP of the heat pump 154 is changed from 2.5 to 2.0, and the circulating hot water amount is reduced. Therefore, the cold heat generated by the heat pump 154 is also reduced (cold water return temperature 15.3 degrees, COP 1.0), and the operation of the heat pump 154 can be continued while coping with a decrease in cooling load.

[Eighth form]
The temperature control system 201 of the molding machine according to the eighth embodiment shown in FIG. 10A is the same as the sixth embodiment except that a heat pump type water heater 204 is used instead of the heat pump 154. The heat pump type water heater 204 is a water heat source, preferably a CO ₂ refrigerant, but may be an R410A refrigerant or the like. The heat pump type hot water heater 204 can generate hot water having a high temperature of about 90 degrees from a low temperature return warm water (25 degrees), but when the hot water return temperature becomes higher than about 45 degrees, the heat pump cycle Since it does not hold, it becomes impossible to continue the operation or it can be operated only in a state where the efficiency is deteriorated (COP 1.0 to 1.5). Therefore, if the heat pump type hot water heater 204 is used as it is for generating hot air, the hot water temperature of about 90 degrees is required to generate hot air of 80 degrees, the return hot water temperature is 80 degrees, and a good operating condition. Not.

Therefore, as in the sixth embodiment, the hot water pump 166 is automatically adjusted so that the hot air temperature is 80 degrees and the hot water return temperature is not more than a predetermined temperature (35 degrees), so that the heat pump water heater 204 is efficiently operated. To continue. For example, in order to maintain the warm air temperature generated from the base air of 15 degrees at 10 m ³ / min at 80 degrees, the hot water temperature goes to 90 degrees (heating 13 kW, COP 3.0), and the heating of the other heat source N is 0 kW. is there. On the other hand, with respect to the cooling load of 8.7 kW (COP2.0), the cold water generated at the same time as the heat is balanced at a cold water temperature going back 7 degrees and returning 17 degrees. The warm water return temperature becomes 25 degrees by adjusting the flow rate of the warm water pump 166. When the hot water circulation amount is reduced to reduce the warm water return temperature to 35 degrees or less, when the heating amount of the base air is insufficient, reheating is performed by the other heat source N. In addition, in order not to use the other heat source N as much as possible, it is set as the capacity | capacitance which warm water return temperature falls sufficiently about the heat exchanger 164.

  An example of the operation of the automatic control device in such control will be described again based on FIG. 11 and the like. The automatic control device first grasps whether or not the molding machine is in operation (S101). If not in operation (No), the hot water pump 166 and the heat pump water heater 204 are stopped (S102, S103), and the process is terminated.

  On the other hand, if it is Yes in S101, the automatic control device checks whether or not the blower fan is in operation (S104). If not (No), it is only in operation of the hot water pump 166. This is stopped (S105, S106), and the process returns to the beginning (S101). If the answer is Yes in S104, it is activated only when the heat pump water heater 204 is stopped (S107, S108), and it is activated at the minimum number of revolutions only when the hot water pump 166 is not in operation ( (S109, S110), it is confirmed whether the hot water return temperature of the heat pump water heater 204 exceeds a predetermined value (35 degrees) (S111).

  When the hot water return temperature of the heat pump water heater 204 exceeds the set value (Yes), the automatic control device reduces the flow rate in the hot water pump 166 by inverter control (S112). By the inverter control for reducing the return hot water flow rate, the temperature of the hot water returning to the heat pump water heater 204 is kept below a predetermined value. Then, the process returns to the beginning (S101).

  On the other hand, when the hot water return temperature of the heat pump water heater 204 does not exceed the set value (No), the automatic control device determines whether the temperature of the hot air that has passed through the heat exchanger 164 is lower than the set value by more than 5 degrees. (S113), only when the answer is Yes, the flow rate in the hot water pump 166 is increased by inverter control (S114). By the inverter control that increases the return hot water flow rate, the hot water heating amount can be increased when the hot air temperature is low (the hot water heating amount is small) and the hot water temperature is less than or equal to the set value. After this, the process returns to the beginning (S101).

  In such a temperature control system 201 of the eighth embodiment, the hot water pump 166 adjusts the amount of heat of hot water to lower the temperature of the returned hot water, so that the heat pump water heater 204 that performs extremely efficient operation is used to generate hot air. It can be used continuously.

[Ninth embodiment]
The temperature control system 221 of the molding machine according to the ninth embodiment shown in FIG. 10B uses an air heat source heat pump water heater 224 instead of the water heat source heat pump water heater 204, and is similar to the eighth embodiment. Become. Even in the ninth embodiment, control can be performed in the same manner as in the eighth embodiment, and an extremely efficient operation of the heat pump type water heater 204 for generating hot air can be continued.

  Further, when the exhaust from the hopper 2 is introduced into the air heat exchanger of the heat pump type hot water heater 224, the efficiency is further improved (from COP3.0 when the outside air is 6 degrees to COP3.8 when the exhaust introduced air is 25 degrees). ).

[Tenth embodiment]
A temperature control system 251 for a molding machine according to the tenth embodiment shown in FIG. 12 includes a cold water pump 252 for circulating cold water in the cold water return pipe 22 and a branch pipe to the cold water supply pipe 20 to the cold water return pipe 22. A chilled water valve 254 is installed as a cooling heat amount adjusting means connected to 253, and an exhaust chilled water heat exchanger 256 is installed on the side of the heat pump 4 from the branch pipe 253 connecting portion of the chilled water return pipe 22. It becomes the same as 3 forms. The exhaust cold water heat exchanger 256 is also connected to an exhaust passage 46 for exhaust discharged from the exhaust port 44 of the hopper 2 so that heat can be exchanged between the exhaust and cold water.

  In such a temperature control system 251, the heat pump 4 operates in the same manner as in the third embodiment and is activated as follows.

  That is, as shown in FIG. 12 (a), when starting the heat pump 4 that has been stopped before starting, since there is no exhaust to be heat-exchanged on the cold water side, the heat pump 4 is started in a state where continuous operation is possible. Can not do it. Therefore, before starting up the heat pump 4, warm air is first produced by the other heat source N, and after the exhaust is generated, the heat pump 4 is started.

For example, the basic air is introduced at 10 m ³ / min · 15 degrees, passed through the stopped heat pump 4 as it is, heated to 80 degrees with another heat source N (13 kW), introduced into the hopper 2 and exhausted at 10 m ³ / Min · 70 degrees is generated. And about this exhaust_gas | exhaustion, it distribute | circulates so that cold water may be heated in the exhaust cold water heat exchanger 256. FIG. The exhaust after heat exchange is discharged at 35 degrees.

  And if an automatic control device grasps | ascertains that exhaust temperature rose to predetermined value (60 degree | times), as shown in FIG.12 (b), it will start the heat pump 4 and will switch to the driving | operation which uses the other heat source N as an auxiliary heat source. . Note that the operation of the heat pump 4 may be started on the condition that the cold water temperature is equal to or higher than a predetermined value (25 degrees) (firstly operating the cold water pump 252).

For example, for a base air of 10 m ³ / min · 15 degrees, 13 kW is heated by the heat pump 4 to 80 degrees, and hot air is introduced into the hopper 2 without heating of the other heat source N. The exhaust of warm air is 70 degrees, and after passing through the exhaust cold water heat exchanger 256, it is 35 degrees. Since there is no cooling load, the chilled water is sent to the branch pipe 253 by the chilled water valve 254, and the chilled water at the going temperature 20 is returned to the heat pump 4 at 25 degrees by heat exchange with the exhaust.

  In such a temperature control system 251 of the tenth embodiment, since the heat pump 4 is started after exhaust is generated by the other heat source N, the heat pump 4 can be started very smoothly so that extremely efficient operation can be continuously performed. can do.

[Other forms]
In the above embodiment, the hopper exhaust (heat belonging to the factory) is used as the cooling side heating medium applied to the cooling side of the heat pump that performs heating and cooling, but instead of or together with the hopper exhaust. The heat belonging to other factories as shown below can be used. That is, by other exhaust or exhaust heat generated at the factory, heat from the resin molding machine, heat from the hydraulic fluid of the resin molding machine, heat radiation of the work after coating and drying of resin products such as spoilers, and hot water washing The heat transferred to the washing water when the heated resin product is washed in the subsequent washing step, or a combination thereof is used. In addition, various controls and switching by the automatic control device can be performed manually. In addition, for the adjustment of the hopper heating amount (heating amount adjusting means), instead of adjusting the branch amount to the cold water heat exchanger, by adjusting the amount of exhaust gas hitting the cooling medium heating heat exchanger, A combination of these may be used. Furthermore, an inverter pump may be used in adjusting the branch amount of the cold water (heat exchange amount adjusting means). Further, the number of elements may be changed as appropriate, such as a combination of a plurality of heat pumps and coolers.

1,51,101,121,151,201,221,251 (Molding machine) temperature control system 2 Hopper 3 Mold 4 Heat pump (exhaust heat recovery type, hot air supply type)
14 Heat exchanger (for heat pump) 34 Heat exchanger for cooling water (heat exchanger for cooling medium heating)
40 Hot air inlet (inlet)
44 Exhaust port 154 Heat pump (exhaust heat recovery type, hot water supply type)
164 Heat exchanger (Air heating means)
166 Hot water pump (heating medium pump)
204 Heat pump water heater N Other heat sources

Claims (15)

A molding machine having a hopper in which raw materials are stored and a mold into which the raw materials are charged;
A blower for sending air to the hopper;
An inlet provided in the hopper for receiving the air;
Cooling means for cooling the mold;
A heat pump for heating and supplying the heating medium in the heating means for heating the air between the blower and the introduction port, or the air by a heating medium, and supplying the cooling medium to the cooling means by cooling;
A temperature control system for a molding machine, comprising: a cooling medium heating heat exchanger for heating the cooling medium with heat belonging to a factory. The hopper is provided with an exhaust port for discharging the air,
The temperature control system of a molding machine according to claim 1, wherein the cooling medium heating heat exchanger heats the cooling medium with the air from the exhaust port.   The temperature control system for a molding machine according to claim 1 or 2, further comprising heating amount adjusting means for adjusting a heating amount of the cooling medium in the cooling medium heating heat exchanger. The temperature adjustment system for a molding machine according to claim 3, wherein the heating amount adjusting means is a heat exchange amount adjusting means for adjusting a branch amount of the cooling medium to the cooling medium heating heat exchanger. . 5. The supply set temperature of the cooling medium in the heat pump is raised when the cooling of the mold by the cooling medium is not required and the heating of the air is required. The temperature control system of the molding machine in any one of. The temperature control system for a molding machine according to any one of claims 1 to 5, further comprising a cooler for cooling the cooling medium. When at least one of the temperature of the air after heating, the temperature of the hopper, or the temperature of the heating medium falls outside a predetermined range, an automatic control device controls the output of the heat pump until at least one falls within a specific range The temperature control system for a molding machine according to any one of claims 1 to 6, further comprising: When at least one of the temperature of the mold or the temperature of the cooling medium is outside a predetermined range, an automatic control device is provided that controls the output of the heat pump until at least one of the temperature is within a specific range. The temperature control system of the molding machine in any one of Claims 1 thru | or 7. When at least one of the temperature of the mold, the temperature of the cooling medium, or the temperature of the heat exchanger for cooling medium heating is out of a predetermined range, the heating of the cooling medium until at least one of the temperature is within a specific range. The temperature control system for a molding machine according to any one of claims 3 to 8, further comprising an automatic control device for controlling the amount. The temperature control system for a molding machine according to any one of claims 7 to 9, wherein the automatic control device decreases a heating amount in the heat pump when a temperature of the cooling medium decreases. The temperature control system for a molding machine according to claim 10, wherein the automatic control device reduces the amount of the air before heating when the temperature of the cooling medium decreases. The temperature control system for a molding machine according to claim 10 or 11, wherein the automatic control device decreases a supply set temperature of the heating medium when the temperature of the cooling medium decreases. A heating medium pump for circulating the heating medium in a state where the amount of heat when returning to the heat pump is constant,
The temperature control system for a molding machine according to any one of claims 10 to 12, wherein the automatic control device increases a supply set temperature of the heating medium when the temperature of the cooling medium decreases. Another heat source for heating the cooling medium,
The temperature control system for a molding machine according to any one of claims 1 to 13, wherein the heat pump is started after the cooling medium is heated by the other heat source. Other heat sources for heating the air are provided,
The temperature control system for a molding machine according to any one of claims 2 to 13, wherein the heat pump is started after the cooling medium is heated by the air from the exhaust port.

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