JP5641740B2 - Electrodeposition coating equipment - Google Patents

Description

  The present invention relates to an electrodeposition coating apparatus used in a pretreatment electrodeposition coating process and the like.

  Pre-treatment for electrodeposition coating involves sequentially immersing the target object in a degreasing tank containing a heated degreasing liquid or a film forming tank (chemical conversion tank) containing a similarly heated film forming liquid, and further painting. It is carried out by immersing and energizing in an undercoat coating tank (electrodeposition tank) containing an undercoat electrodeposition liquid that absorbs heat. Conventionally, in a pretreatment electrodeposition coating apparatus, a degreasing tank, a chemical conversion tank, and an electrodeposition tank are individually heated or cooled with steam (hot water tank) or cold water (cold water chiller). However, the linkage of heating or cooling is not considered, and there is room for improving energy efficiency.

  Therefore, a pretreatment electrodeposition coating apparatus as described in Patent Document 1 below has been proposed in consideration of the linkage between heating and cooling. This pretreatment electrodeposition coating apparatus has a heat pump chiller that heats the degreasing liquid and the film forming liquid, while cooling the electrodeposition liquid for undercoating, and for each liquid heating and cooling independently. It is considered to be excellent in energy efficiency.

JP 2008-56980 A

  However, in this electrodeposition coating apparatus, each liquid is merely heated and cooled by a heat pump chiller, so that the degree of improvement in energy efficiency is limited. In addition, it is assumed that this electrodeposition coating apparatus is equipped with a discharge device that directly releases part of heat into the atmosphere, but there is also a aspect in which the released heat is wasted.

Accordingly, a first aspect of the present invention, the energy efficiency is extremely good, it is intended to provide the operation is smooth electrodeposition coating device.

In order to achieve the above object, the invention described in claim 1 includes a pretreatment tank containing a pretreatment liquid and / or a washing booth after electrodeposition coating using hot water, and an electrodeposition tank containing an electrodeposition liquid. And a heating pump that heats the heating medium that heats the pretreatment liquid and / or the hot water, cools a cooling medium that cools the electrodeposition liquid, and adjusts a heating load amount of the heating medium to the heat pump. A cooling temperature sensor for detecting a heating load amount adjusting means and a cooling supply temperature that is a temperature when the cooling medium is supplied from the heat pump and / or a cooling return temperature that is a temperature when the cooling medium returns to the heat pump. When, and other heat sources to assist the heating by the heating and / or the heating medium to the heating medium, is connected to the cold temperature sensor and the other heat source, the cold feed obtained from the cold temperature sensor And an automatic control device that controls the heating load amount in the heating load amount adjusting means according to the temperature and / or the cold return temperature and adjusts the heating supply amount by the other heat source. is there. Here, in the item “control the heating load amount in the heating load amount adjusting means and adjust the heating supply amount by the other heat source”, the heating load of the heat pump is changed as a result of adjusting the heating supply amount by the other heat source. is is that Ru is included.

In order to achieve the above object, the related invention is to heat a pretreatment tank containing a pretreatment liquid, an electrodeposition tank containing an electrodeposition liquid, and a heating medium for heating the pretreatment liquid. A heat pump for cooling the cooling medium for cooling the electrodeposition liquid, cooling load amount adjusting means for adjusting a cooling load amount of the cooling medium to the heat pump, and a temperature at which the heating medium is supplied from the heat pump A temperature supply temperature and / or a temperature return temperature that is a temperature at which the heating medium returns to the heat pump, another temperature source for assisting cooling of the cooling medium, the temperature temperature sensor, and The cooling load amount in the cooling load amount adjusting means is controlled according to the temperature supply temperature and / or the temperature return temperature obtained from the temperature temperature sensor, connected to the other cooling heat source, and It is characterized in that it comprises an automatic control device for adjusting the cold supply amount of the serial other cold source. Here, the item of “controlling the cooling load amount in the cooling load amount adjusting means and adjusting the cooling heat supply amount by the other cooling heat source” includes the cooling load of the heat pump as a result of adjusting the cooling heat supply amount by the other cooling heat source. Is included.

In addition to the above object, the related invention achieves the object of performing control more effectively in a simple manner. In the above invention, when the temperature of the cooling medium decreases, the automatic control device When the heating amount is decreased or the temperature of the heating medium is increased, the cooling amount in the heat pump is decreased.

In addition to the above object, the related invention achieves the object of performing the control smoothly and accurately while being simpler. In the above invention, when the temperature of the cooling medium decreases, The supply set temperature of the cooling medium is increased or the supply set temperature of the cooling medium is increased when the temperature of the heating medium is increased.

In addition to the above-mentioned object, the related invention is to circulate the heating medium in a state where the amount of heat at the time of returning to the heat pump is constant in order to achieve the object of performing control in a simple yet effective manner. The automatic control device is characterized in that when the temperature of the cooling medium decreases, the supply temperature of the heating medium increases.

The related invention is provided with an air-cooled heat pump that can heat the cooling medium to ensure balance and can also cool the cooling medium when the cooling load is relatively increased. In order to achieve the purpose to be performed in an energy saving state, a pretreatment tank containing a pretreatment liquid, an electrodeposition tank containing an electrodeposition liquid, a heating medium for heating the pretreatment liquid, and a heating medium are heated. A heat pump that cools the cooling medium that cools the landing liquid, and an air-cooled heat pump that heats or cools the cooling medium, and the medium of the air-cooled heat pump is cooled or heated by the cooling medium The heating or cooling for the medium of the air-cooled heat pump is switched.

In addition to the above-mentioned object, the related invention is the above-mentioned invention, in order to achieve the object of more smoothly performing the operation switching, further comprising an auxiliary heat source for heating or cooling the medium, and the cooling medium In accordance with the cooling or heating of the medium, cooling or heating by the other auxiliary heat source is performed.

In order to achieve the object of providing heating and cooling that is extremely energy-saving while appropriately dealing with the load and exhaust heat state at the start-up of the production line, a related invention is provided with a pretreatment tank containing a pretreatment liquid, An electrodeposition bath containing an electrodeposition liquid, and a heat pump for heating a heating medium for heating the pretreatment liquid and a cooling medium for cooling the electrodeposition liquid, the heat pump comprising: The follow-up operation and the cooling medium follow-up operation are possible, the start of the cooling medium follow-up operation is performed at the time of start-up, and when the predetermined condition relating to the sufficient generation of the cooling load in the electrodeposition tank is satisfied, the heating medium follow-up operation is It is a feature.

The related invention is to achieve a purpose of appropriately responding to the load state when the work loading is stopped in the pretreatment process, and a pretreatment tank containing a pretreatment liquid and an electrodeposition tank containing an electrodeposition liquid. And a heat pump that heats the heating medium that heats the pretreatment liquid and cools the cooling medium that cools the electrodeposition liquid, and the heat pump is capable of heating medium following operation and cooling medium following operation. Then, when the state in which no work is carried into the pretreatment tank continues for a specific time during the heating medium following operation, the operation is switched to the cooling medium following operation.

The related invention is to heat a pretreatment tank containing a pretreatment liquid, an electrodeposition tank containing an electrodeposition liquid, and the pretreatment liquid in order to achieve the purpose of quickly preparing for the electrodeposition coating process. A heat pump for heating the heating medium and cooling the cooling medium for cooling the electrodeposition liquid is provided, and the heat pump is operated even when the pretreatment electrodeposition coating process is stopped or started. It is a feature.

The related invention achieves the purpose of continuing the operation of the heat pump in a state where the energy saving performance is extremely good by simple control of switching of the operating state, so that the pretreatment tank containing the pretreatment liquid and the electrodeposition liquid are contained. An electrodeposition bath, a heat pump for heating the heating medium for heating the pretreatment liquid, a cooling pump for cooling the cooling medium for cooling the electrodeposition liquid, another heat source for assisting heating of the heating medium, and the cooling medium. The heat pump is capable of both a heating medium following operation and a cooling medium following operation, and the cooling medium following operation from the heating medium following operation when the cooling medium becomes lower than a predetermined temperature. When the heating medium exceeds a specific temperature, the operation is switched from the cooling medium following operation to the heating medium following operation.

In addition to the above object, the related invention is characterized in that, in order to achieve the object of executing the heating of the cooling medium with energy saving, a cooling medium heater for heating the cooling medium is provided in the above invention. It is what.

In addition to the above object, the related invention is to achieve the object of simply heating the cooling medium. In the above invention, the cooling medium heater is a heat pump for heating. It is.

The related invention achieves the purpose of continuously providing heating or cooling by a heat pump in a simple configuration with low initial cost and running cost and feasible together with heat recovery. A treatment tank, an electrodeposition tank containing an electrodeposition liquid, a heating medium that heats the pretreatment liquid, a heat pump that cools a cooling medium that cools the electrodeposition liquid, and a heating medium that heats the cooling medium A cooling medium heater is provided, and the heat pump is operated in a state of supplying a cooling medium having a cooling heat amount exceeding the cooling load amount of the electrodeposition liquid in the cooling medium following operation.

In addition to the above object, the related invention achieves the object of further heating the cooling medium in an energy saving and simple manner. In the above invention, the cooling medium heater includes the cooling medium and the cooling side heating medium. And the heat exchange is performed to heat the cooling medium with the cooling side heating medium.

In order to achieve the purpose of effectively preventing shortage of heat and overcooling with a simple configuration or operation, the related invention has a pretreatment tank containing a pretreatment liquid, an electrodeposition tank containing an electrodeposition liquid, The heating medium for heating the pretreatment liquid is heated, the heat pump for cooling the cooling medium for cooling the electrodeposition liquid, and the cooling medium and the cooling-side heating medium are introduced and heat exchanged to introduce the cooling medium. A heat exchanger for heating by the cooling side heating medium, the cooling side heating medium is cooling water and / or cold water in a facility requiring cooling, and the cooling water and / or cooling water is cooled to a predetermined temperature and The apparatus further includes a cooler supplied to the cooling medium heater and an equipment coolant temperature adjusting means.

The related invention achieves the purpose of continuing the operation of the heat pump that is energy saving without performing complicated control, in order to achieve the purpose of the pretreatment tank containing the pretreatment liquid, the electrodeposition tank containing the electrodeposition liquid, The heating medium that heats the pretreatment liquid and the heat pump that cools the cooling medium that cools the electrodeposition liquid and the cooling medium and the cooling-side heating medium are introduced and heat-exchanged to thereby remove the cooling medium. A heat exchanger for heating with a cooling side heating medium is provided, and the cooling side heating medium is supplied from an air cooling heat pump, and the air cooling heat pump maintains the cooling side heating medium at a predetermined temperature in the previous period. is there.

In addition to the above-mentioned object, the related invention is the above-mentioned invention, in order to achieve the object corresponding to the cooling load in a simple configuration and control, and in the above-mentioned invention, the cooling-side heating medium heat amount adjustment for adjusting the heat amount of the cooling-side heating medium Means is provided.

In addition to the above object, the related invention is the above invention, in order to further achieve energy saving by utilizing exhaust heat and to achieve the object of simply heating the cooling medium. It includes at least one of waste heat water, make-up water, exhaust water, exhaust gas, equipment heat radiation, work heat radiation, air conditioning exhaust heat or cogeneration cooling water. is there.

In addition to the above object, the related invention achieves the object of simply heating the cooling medium. In the above invention, the cooling side heating medium is supplied from a cooling pump for supplying the cooling side heating medium. It is characterized by this.

In addition to the above-mentioned object, the related invention is the above-mentioned invention, in order to achieve the object of automatically operating under various conditions and continuing the operation with excellent energy saving. The heat pump includes a plurality of automatic control devices that switch the number of operating heat pumps for supplying the plurality of cooling-side heating media according to the state of the heating media and / or the cooling media. .

In addition to the above object, the related invention achieves the object of enabling a smoother automatic operation. In the above invention, the automatic control device has a load related to the cooling medium related to the heating medium. In the case of decreasing with respect to the load, a part of the plurality of cooling-side heating medium supply heat pumps is set in an operation standby state.

In addition to the above-described object, the related invention can cope with various scales at a low cost, and in order to achieve the object of being able to more appropriately introduce an electrodeposition coating using a heat pump excellent in energy efficiency, In the above invention, a plurality of the cooling medium heaters and / or heat exchangers are provided.

In addition to the above-mentioned object, the related invention can automatically and appropriately perform control related to adjustment of the chilled water load and prevention of insufficient supply of chilled water or hot water, and achieves the purpose of ensuring more efficient and stable operation. Therefore, in the above invention, an automatic control device that switches the number of operating and / or operating modes of the plurality of cooling medium heaters according to the state of the heating medium and / or the cooling medium is provided. To do.

In addition to the above object, the related invention is capable of suppressing power consumption and being able to continue the operation of the heat pump, in order to achieve the object of providing an electrodeposition coating that is further excellent in energy saving and operational stability. In the above invention, the operation mode of the heat pump can be switched between a heating mode and a cooling mode.

  According to the present invention, heating of the pretreatment liquid and cooling of the electrodeposition liquid are collectively performed by a heat pump, and waste water from a factory, warm water from a separate heat pump, etc. (cooling side heating medium), and a cooling medium for the electrodeposition liquid Perform heat exchange at. Therefore, it is possible to prevent overcooling according to the amount of heating by applying the cooling side heating medium to the refrigerant, and it is possible to secure an extremely efficient and stable operation of the heat pump. When the warm water is used as the medium, there is an effect that the warm water can be cooled by effectively utilizing the energy of the warm water. In addition, according to the present invention, a heating load amount adjusting means for the heat pump of the heating medium, a cold water temperature sensor for detecting a temperature when the cooling medium returns to the heat pump, another heat source for assisting heating of the heating medium, The cooling medium is provided with an automatic control device that is connected to the cold water temperature sensor and the other heat source and controls the heating load amount in the heating load amount adjusting means according to the return temperature of the cooling medium and adjusts the heating supply amount by the other heat source. Even if the heating or heating load or cooling load changes, it is possible to perform heating or cooling as efficiently as possible while appropriately responding.

It is a block diagram of the electrodeposition coating apparatus which concerns on the 1st form of this invention. It is a block diagram of the electrodeposition coating apparatus which concerns on the 2nd form of this invention. It is a block diagram of the electrodeposition coating apparatus which concerns on the 3rd form of this invention. (A) Block diagram when the cooling load is heavy, (b) Block diagram when the cooling load is light, and (c) Block diagram when the cooling load is small, of the electrodeposition coating apparatus according to the fifth embodiment of the present invention. . 5A is a block diagram when there is no cooling load, and FIG. 5B is a block diagram when the heating load is heavy. (A) Block diagram when the cooling load is heavy, (b) Block diagram when the cooling load is light, (c) Block diagram when the cooling load is small, in the electrodeposition coating apparatus according to the sixth embodiment of the present invention. . (A), (b) is a block diagram when an air cooling heat pump fails in the electrodeposition coating apparatus of FIG. 6, and (c) is a case where the cooling load of the electrodeposition coating apparatus according to the seventh embodiment of the present invention is small. FIG. (A) Block diagram when the cooling load is heavy, (b) Block diagram when the cooling load is light, and (c) Block diagram when the cooling load is small, of the electrodeposition coating apparatus according to the eighth embodiment of the present invention. . (A), (b) is a block diagram when there is no cooling load in the electrodeposition coating apparatus of FIG. 8, (c) is a case where there is no cooling load of the electrodeposition coating apparatus according to the ninth embodiment of the present invention. It is a block diagram. It is a block diagram of the electrodeposition coating apparatus which concerns on the 10th form of this invention. It is a flowchart which concerns on operation | movement of the electrodeposition coating apparatus of FIG. It is a flowchart which concerns on operation | movement of the electrodeposition coating apparatus which concerns on the 11th form of this invention. It is a flowchart which concerns on operation | movement of the electrodeposition coating apparatus which concerns on the 12th form of this invention. It is a block diagram of the electrodeposition coating apparatus which concerns on the 13th form of this invention. It is a flowchart which concerns on operation | movement of the electrodeposition coating apparatus of FIG. It is a block diagram at the time of (a) heating operation of the air-cooling heat pump in the electrodeposition coating apparatus which concerns on 14th form of this invention, (b) At the time of operation switching, (c) At the time of cooling operation. (A) is a block diagram of the electrodeposition coating apparatus which concerns on the 15th form of this invention, (b) is a block diagram of the electrodeposition coating apparatus which concerns on the 16th form of this invention. It is a flowchart which shows operation | movement of the electrodeposition coating apparatus of Fig.17 (a). It is a flowchart which shows operation | movement of the electrodeposition coating apparatus which concerns on a 17th form. It is the flowchart which shows (a) block diagram and (b) operation | movement of the electrodeposition coating apparatus which concerns on an 18th form. It is a block diagram of the electrodeposition coating apparatus which concerns on a 19th form. It is a block diagram of the electrodeposition coating apparatus which concerns on a 20th form. It is a block diagram of the electrodeposition coating apparatus which concerns on a 21st form.

  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 an electrodeposition coating apparatus 1 according to a first embodiment, and the electrodeposition coating apparatus 1 is used here in a pretreatment process when electrodepositing an automobile body. In addition, the parts to be coated by the electrodeposition coating device 1 are automobile parts, construction engineering machinery, special vehicles, steel furniture, steel fittings, vending machines, heavy electrical equipment, agricultural machinery, prefabricated steel frames, hard disk drives, manholes. It can be a lid, an air conditioner or the like.

  In the pretreatment of electrodeposition coating, in order to ensure the quality of the coating, the body is degreased before the electrodeposition coating to form a base film. Accordingly, the electrodeposition coating apparatus 1 includes a degreasing tank 2 containing a degreasing liquid, a chemical conversion tank 4 containing a chemical conversion liquid, and an electrodeposition tank 6 containing an electrodeposition liquid, each of which can be immersed in a body. I have. The degreasing liquid and the chemical conversion liquid are combined as a pretreatment liquid, and the degreasing tank 2 and the chemical conversion tank 4 are combined as a pretreatment tank.

  While the pretreatment liquid degreasing liquid and chemical conversion liquid operate at a higher temperature than normal temperature (room temperature), pretreatment electrodeposition coating needs to suppress heat generation by energization, so the degreasing liquid and chemical conversion liquid are heated, The electrodeposition liquid is cooled. Here, the degreasing liquid is held around 60 degrees Celsius (the same applies hereinafter), the chemical conversion liquid is held around 40 degrees, and the electrodeposition liquid is held around 30 degrees. It should be noted that steps or tanks such as pre-cleaning, pre-degreasing, and surface adjustment may be added as appropriate. If heating is performed together with the pre-cleaning tank and the pre-degreasing tank, the same operation as the degreasing tank 2 or the chemical conversion tank 4 is performed. can do. In this case, the pretreatment liquid includes a preliminary cleaning liquid, a preliminary degreasing liquid, and the like, and the pretreatment tank includes a preliminary cleaning tank, a preliminary degreasing tank, and the like.

  The electrodeposition coating apparatus 1 includes an exhaust heat recovery type heat pump 10 that collectively performs such heating and cooling. The heat pump 10 generates cold water while simultaneously generating hot water using exhaust heat generated at that time, and supplies the hot water to the outside. Here, the cold water is about 7 to 30 degrees and about 40 to 70 degrees. Recently developed (high efficiency high temperature take-out machine HEM150HR manufactured by Kobe Steel) can be used. The heat pump 10 supplies hot water and cold water at the same time, and heat and cold water that has been sufficiently absorbed and exhausted by the use of heat and cold heat is supplied again by heating and cooling. In order to continuously extract a large amount of high-temperature water, it is necessary that the heat of the high-temperature water is sufficiently absorbed by the target and returned, and a large amount of low-temperature water is also taken out and returned with sufficient heat. There is. The heat pump 10 may be one that can supply hot water at a maximum of 90 degrees, or one that can supply warm water at 95 degrees with cold water (waste water) at 30 degrees.

  The heat pump 10 has a pipe 12 for supplying hot water as a heating medium to the degreasing tank 2 to the chemical conversion tank 4 for heating the degreasing liquid and the chemical conversion liquid, and as a cooling medium for the electrodeposition tank 6 for cooling the electrodeposition liquid. A pipe 16 for supplying cold water. In addition, it has a pipe 22 for returning hot water from the degreasing tank 2 to the chemical conversion tank 4 to the heat pump 10, and a pipe 26 for returning cold water from the electrodeposition tank 6 to the heat pump 10. Each pipe may be provided with a heat exchanger or a tank (not shown). Moreover, the pipes 12 and 22 may be separated or branched for the degreasing tank 2 and the chemical conversion tank 4 and connected to the heat pump 10 to appropriately change the arrangement of the pipes.

  The electrodeposition coating apparatus 1 is installed here in a factory that also performs body pressing and welding. Waste water such as compressor cooling water and spot welding machine cooling water is contributed from the factory. That is, the electrodeposition coating apparatus 1 is installed in a factory that generates waste warm water X as a cooling-side heating medium, and the waste warm water X is heat belonging to the factory. In addition, it is a factory where the waste water X where the other equipment is also installed generally performs the electrodeposition coating including the above-described coating targets.

  Furthermore, a heat exchanger 30 for cooling side heating is installed in a pipe 26 from the electrodeposition tank 6 to the heat pump 10 in the electrodeposition coating apparatus 1, and a pipe 32 for introducing the exhausted warm water X into the heat exchanger 30. And a pipe 34 for extracting the exhausted hot water X after heat exchange is connected (cooling medium heater). The pipe 32 is provided with a flow rate adjusting valve 36 as heating amount adjusting means. In addition to the flow rate adjusting valve 36 as the flow rate adjusting means for adjusting the flow rate, a pump or inverter for adjusting the discharge amount, or a combination thereof may be adopted as the heating amount adjusting means.

  The degreasing tank 2 or the chemical conversion tank 4 has other heat source heat exchangers 42 and 44 capable of introducing another heat source Z (here, it is steam but may be an electric heater, an air-cooled heat pump, or a combination thereof). One by one is arranged, and the degreasing liquid or chemical conversion liquid can also be heated by another heat source Z. The pipes 45 and 46 connecting the other heat source Z and the other heat source heat exchangers 42 and 44 are respectively provided with flow rate adjusting valves 47 and 48 as other heat source heating amount adjusting means capable of adjusting the heating amount.

  In addition, pumps 50 and 52 are sequentially installed on the return pipe 22 on the heating side and the return pipe 26 on the cooling side (closer to the heat pump 10 than the heat exchanger 30 for cooling side heating). Further, a cold water temperature sensor 54 is installed as a cold temperature sensor for detecting the temperature (heat quantity) of the return cold water in the pipe 26, and the cold water temperature sensor 54 is an automatic control device (not shown) that controls the electrodeposition coating apparatus 1. Is electrically connected to the heat pump 10. The automatic control apparatus may be common with the control means of the heat pump 10 and the control means of various devices, may be a separate computer, or may be a combination thereof.

  The pumps 50 and 52 are inverter-controlled by an automatic control device, and adjust the flow rate of hot water or cold water (return hot heat amount adjustment means / return hot water flow rate adjustment means, return cold heat amount adjustment means / return cold water flow rate adjustment means).

  Such an electrodeposition coating apparatus 1 operates as described below, for example.

  That is, the automatic control device performs inverter control on the pump 50 in the temperature follow-up operation, so that warm water (60 degrees) corresponding to the heating load (heating load, thermal load) of the degreasing tank 2 and the chemical conversion tank 4 is obtained. The degreasing tank 2 and the chemical conversion layer 4 are supplied through the pipe 12 and returned to the heat pump 10 through the pipe 22. In addition, the automatic control device performs inverter control on the pump 52 in the cooling / following operation, so that cold water (7 degrees) corresponding to the cooling load (cooling load) of the electrodeposition tank 6 is supplied via the pipe 16. It is supplied to the landing tank 6 and returned to the heat pump 10 through the pipe 26.

  The automatic control device adjusts the heat exchange amount of the exhaust heat of the exhaust warm water X to the cold water by adjusting the opening degree of the flow control valve 36 (heating amount adjusting means). By appropriately heating the cold water by exhaust heat, the following situation can be prevented. That is, when the heating load of the degreasing tank 2 and the chemical conversion tank 4 is relatively high, the cold heat generated at the same time by generating the necessary heat becomes excessive with respect to the cooling load. As a result, the balance between the heat and the cold is lost, and the heat pump 10 is stopped in an emergency and the operation is not continued.

  Further, when the automatic control device determines that the exhaust heat of the exhaust hot water X is equal to or less than a predetermined value and the exhaust heat is insufficient, the flow rate of the hot water (the amount of heat returning to the heat pump 10) is recognized by the cold water temperature sensor 54. By adjusting the pump 50 according to the chilled water temperature and adjusting it to reduce the hot water heating amount, the temperature of the returning chilled water is raised while corresponding to the cooling load (thermal follow-up operation, heating load amount adjusting means). While the heat is supplied by the heat pump 10 according to the generation of cold water commensurate with the cooling load, an excessive temperature drop in the cold water returning to the heat pump 10 is prevented, and the operation of the heat pump 10 is continued. In this case, when the amount of heat of the hot water supplied by the heat pump 10 is insufficient with respect to the heating load, the automatic control device controls the flow rate adjusting valves 47 and 48 to control the degreasing tank 2 and the chemical conversion tank 4 to be heated. Steam Z is introduced into the other heat source heat exchangers 42 and 44 to operate the other heat source, and the insufficient heat is backed up. Note that when the exhaust heat of the exhaust hot water X becomes equal to or higher than a specific value (which may be the same as the predetermined value), the automatic control device returns to the heat following operation in which the exhaust heat is applied to the cold water.

  The above-mentioned electrodeposition coating apparatus 1 is installed in a factory that generates waste warm water X, and includes a degreasing tank 2 and a chemical conversion tank 4 containing a degreasing liquid and a chemical conversion liquid, an electrodeposition tank 6 containing an electrodeposition liquid, Heat pump 10 for heating the heating medium (hot water) in pipes 12 and 22 for heating the degreasing liquid and chemical conversion liquid, and for cooling the cooling medium (cold water) in pipes 16 and 26 for cooling the electrodeposition liquid, and the heating medium A pump 50 that adjusts the heating load on the heat pump 10, a cold water temperature sensor 54 that detects a cold return temperature that is a temperature when the cooling medium returns to the heat pump 10, and another heat source Z that assists heating of the heating medium The automatic control device is connected to the chilled water temperature sensor 54 and the other heat source Z and controls the heating load amount in the pump 50 according to the chilled heat return temperature obtained from the chilled water temperature sensor 54 and adjusts the heating supply amount by the other heat source Z. It is equipped with a. Instead of adjusting the amount of heat by adjusting the flow rate of the pump 50, a bypass circuit for returning from the pipe 12 to the pipe 22 (inlet of the pump 50) is installed, and a control valve is provided in the bypass circuit to exchange heat with the pretreatment tank. (By increasing the bypass amount, the amount of heat exchange between the hot water and the pretreatment liquid decreases and the temperature of the hot water returns to the heat pump 10 without lowering), thereby reducing the output of the heat pump 10 and lowering the temperature of the cold water It is also possible to prevent this.

  Therefore, although it is going to operate the heat pump 10 according to a heating load, the cooling load is too light and cooling water is too cold, and the situation where the heat pump 10 stops without being able to balance heating water and cooling water. The heat pump 10 can be avoided and can be operated with extremely high efficiency for heating or cooling, and can be covered with one heat pump 10 that emits less carbon dioxide during the operation. Since the other heat source Z is provided, heating of the heating medium by the heat pump 10 fluctuates or heating of the heating medium is insufficient in order to maintain a balance while the heating of the cooling medium of the heat pump 10 is insufficient. However, it can be backed up by the other heat source Z, the operation can be stabilized, the heating capacity of the heat pump 10 can be suppressed, and the initial introduction cost and the running cost can be reduced. Furthermore, the heating and cooling adapted to the respective loads of the pretreatment tank and the electrodeposition tank 6 can be effectively controlled by a relatively simple operation method of adjusting the heating load amount by the pump 50. ing.

  In addition, since the heat exchanger 30 for heating the cooling medium with the exhaust hot water X is provided, when the cooling load is light with respect to the heating load, the cooling medium is heated by the exhaust heat to ensure the balance of the cooling and heating. And the operation of the heat pump 10 that provides heating or cooling in a more efficient state can be continued.

  Furthermore, a flow rate adjustment valve 36 that adjusts the flow rate of the exhaust water to the heat exchanger 30 and a cold water temperature sensor 54 that detects a cold water return temperature that is a temperature when the cooling medium in the pipe 26 returns to the heat pump 10 are further provided. The automatic control device is connected to the cold water temperature sensor 54 and controls the flow rate in the flow rate adjustment valve 36 by controlling the opening degree of the flow rate adjustment valve 36 according to the cold water return temperature.

  Therefore, the amount of heat exchange with the waste water in the factory can be automatically adjusted so that the return temperature or heat quantity of the cooling medium suitable for the heat pump 10 can be obtained, and efficient heating or cooling can be automatically performed. Can do. In addition, it may replace with what is based on a pump about flow volume adjustment, and it is good also as what provides a flow volume adjustment valve in the exit of a pump. Further, a bypass circuit for returning from the hot water outlet of the heat pump 10 to the inlet of the pump 50 may be provided to adjust the bypass flow rate, thereby adjusting the heating load on the heat pump 10 or from the cold water outlet of the heat pump 10 to the inlet of the pump 52. The cooling load on the heat pump 10 may be adjusted by providing a bypass circuit for returning to the above and adjusting the bypass flow rate.

[Second form]
FIG. 2 is a schematic diagram of an electrodeposition coating apparatus 81 according to the second embodiment. The electrodeposition coating apparatus 81 is the same as the first embodiment and the modified example except for the configuration between the electrodeposition tank and the heat pump.

  The electrodeposition coating apparatus 81 includes a flow control valve 82 in the pipe 26, a pipe 84 that guides the flow-adjusted branch cold water to the heat exchanger 30, and a pipe 86 that returns the cold water that has passed through the heat exchanger 30 to the pipe 26. . The heat exchanger 30 is introduced with heat radiation from the electrodeposition drying furnace 88 installed in the factory and / or the exhaust hot air Y, and the branched cold water is heated.

  The electrodeposition coating apparatus 81 can be changed as follows. The cooling side is heated by guiding the heat radiation of the work that has come out of the electrodeposition drying furnace 88 (for example, about 150 degrees) to the heat exchanger 30. In addition, even if the heat radiation / exhaust of the electrodeposition drying furnace 88 or the heat radiation of the work is applied to the cooling load of the electrodeposition tank 6, the heating load for the cooling load that cannot be heated by the heat pump 10 alone can be provided. If the balance is achieved, the heat may be supplementarily heated by another heat source, but the heat pump 4 may be operated in the cold water follow-up mode, and the flow control valve 82 may be fully opened to the electrodeposition drying furnace 88 side. Thus, when the heat pump 10 is operated to follow the cold water, it is possible to appropriately cope with the cooling load, and the heating medium and other heat sources of the heat pump 4 that are efficiently generated with the generation of the cooling medium with respect to the heating load. Therefore, it is possible to make it easy to operate with low initial cost and no complicated control.

  In addition, the electrodeposition coating apparatus 81 can be changed as follows. That is, when the flow rate control valve 82 is fully open on the electrodeposition drying furnace 88 side and the amount of chilled water supplied by the heat pump 10 is insufficient (the temperature of the chilled water rises), the flow rate control valve 82 is automatically switched to the electrodeposition drying furnace 88 side. It is possible to perform control to close, and to perform more efficient and stable operation. Further, in the cold water follow-up operation of the heat pump 10, in order to set the state where the heating amount is insufficient (warm water temperature is low) and the state where the heating amount is excessive (warm water temperature is high) to an appropriate state (proper temperature), The output of the heat pump 10 may be controlled by controlling the amount of heat exchange with the heat exchanger 30 by controlling the opening degree of the flow control valve 82 by an automatic control device. Further, a pump (and a cold water tank) may be provided instead of the flow rate adjustment valve 82, and the heat exchange amount in the heat exchanger 30 may be controlled by controlling the flow rate of the pump. In addition, when the cooling tower is connected to the cooling side via a heat exchanger, the cooling water of the heat pump 10 can be cooled by exchanging heat between the cooling water of the cooling tower and the cooling water of the heat pump 10 when the amount of heat of the exhaust heat Y is sufficiently large. The heat pump 10 is operated to follow the hot water, the flow control valve 82 is fully opened to the electrodeposition drying furnace 88 side, and the cold water is heated excessively, and the cooling water temperature is controlled by the cooling tower (other cooling heat source) (cooling load) It may be made to correspond to the above. In this case, it is possible to control the heat pump 10 without causing surplus in the hot water by the hot water follow-up operation, and it is possible to avoid the stop of the heat pump 10 due to the low temperature of the cold water easily at low cost.

  Even in the above-described electrodeposition coating apparatus 81 and the like, by applying the exhaust heat belonging to the factory to the cold water side, the balance of cold against hot heat can be maintained, and the operation of the heat pump 10 can be continued.

[Third embodiment]
As shown in FIG. 3, the electrodeposition coating apparatus 1151 according to the third embodiment is the same as the first embodiment except for the points described below. The heat pump 10 is connected to a hot water supply pipe 1160 and a hot water return pipe 1162, and a heat exchanger 1164 (heating means) that performs heat exchange between the hot water and the heating medium is connected to these pipes. A heating medium supply pipe 1112 and a heating medium return pipe 1113 are also connected to the heat exchanger 1164, another heat source heat exchanger 1104 is disposed in the heating medium supply pipe 1112, and the heating medium return pipe 1113 is used for heating medium circulation. The pump 1115 is arranged. The heating medium is heated by passing through the heat exchanger 1164, appropriately supplied with additional heat from another heat source Z, and supplied to the degreasing tank 2 and the chemical conversion tank 4. A hot water pump 1166 that circulates hot water at a constant speed is attached to the hot water return pipe 1162.

  For example, the automatic control device introduces a heating medium of 55 degrees into the heat exchanger 1164 and heats it to 58 degrees (374 kW). This heating medium is further heated to 60 degrees by another heat source Z (heating load 249 kW). Warm water for heating medium heating is 70 degrees and 60 degrees return (heating load 374 kW, COP 2.9), while cold water is also generated at 7 degrees and 17 degrees return with this warm water supply, resulting in a cooling load of 245 kW On the other hand, it works in a balanced state (just when cold is used). The automatic controller monitors the heating medium temperature in the heating medium supply pipe 1112 (immediately after the heat exchanger 1164) between the heat exchanger 1164 and the other heat source Z and supplies hot water to the heat pump 10 so that the temperature becomes 60 degrees. Control (warm water 70 degrees).

  Then, the automatic control device monitors the cold water temperature, and when the cooling load decreases to 129 kW and the cold water temperature falls below a predetermined temperature, the hot water supply set temperature of the heat pump 10 is lowered from 70 degrees to 65 degrees. Then, the heating amount of the heat pump 10 is reduced to 187 kW (heating side COP3.2), the heating medium is heated to 56.5 degrees, the cooling heat applied to the cooling water is also reduced, and the cooling water return temperature becomes a predetermined temperature or higher. After returning (12 degrees), the balance of heat and cold is maintained. In addition, a heating medium is heated by the amount of heating 436 kW with the other heat source Z, and it is set as 60 degree | times which the degreasing tank 2 and the chemical conversion tank 4 desire.

  The heat pump 10 may be operated following the warm water temperature (for example, desired heating medium temperature +5 degrees), and even in this case, the amount of cold heat can be lowered by lowering the warm water temperature set value. Alternatively, by increasing the heating amount of the other heat source (lowering the heating temperature set value), it is possible to reduce the heating load of the heat pump 10 and thus reduce the amount of cold heat. Moreover, even if the flow rate of the hot water pump 1166 is reduced by an inverter while keeping the hot water supply temperature constant, the heating amount is lowered and thus the cold heat amount is lowered.

  Even in the third embodiment of the electrodeposition coating apparatus 1151, as in the first embodiment, the operation balance can be continued by maintaining the supply balance between the heat and cold in the heat pump by a simple method.

[Fourth form]
The electrodeposition coating apparatus according to the fourth embodiment is the same as that of the third embodiment. The automatic control device performs a constant heat amount operation having a heat amount for generating a predetermined heating medium temperature instead of the constant flow rate operation for the hot water pump 1166. The hot water pump 1166 automatically adjusts the flow rate of the hot water in order to keep the amount of heat constant.

  For example, a heating medium of 45 degrees is heated to 300 degrees by a heat exchanger 1164 (COP 3.6, 60 degrees of warm water flow) to 50 degrees, and the cooling load 217 kW (COP 2.6) is balanced (cold water movement). 7 degrees and 17 degrees returned). The hot water pump 1166 is operated so as to have a hot water heat amount such that the heating medium temperature is 50 degrees with respect to the hot water circulation amount.

  Then, when the cooling load is reduced to 196 kW and the cold water return temperature becomes 16 degrees or lower, the automatic control device raises the hot water supply set temperature of the heat pump 10 to 70 degrees (warm water temperature going back 70 degrees / return 60 degrees). At this time, since the hot water pump 1166 continues the constant heat amount operation, the heating COP of the heat pump 10 is changed from 3.6 to 2.9, and the circulating hot water amount is reduced. By raising the hot water supply temperature, the cold heat generated by the heat pump 10 is also reduced (cold water return temperature 17 degrees, COP 1.9), and the operation of the heat pump 10 can be continued while corresponding to a decrease in cooling load.

[Fifth embodiment]
FIG. 4A is a schematic diagram when the cooling load of the electrodeposition coating apparatus 2861 according to the fifth embodiment is heavy, and FIG. 4B is a schematic view when the cooling load of the electrodeposition coating apparatus 2861 is relatively light. 4 (c) is a schematic diagram when the thermal load of the electrodeposition coating apparatus 2861 exceeds the cooling load, FIG. 5 (a) is a schematic diagram when there is no cooling load of the electrodeposition coating apparatus 2861, and FIG. The electrodeposition coating apparatus 2861 is a schematic diagram when there is no cooling load and the heating load is relatively large (such as when the production line is started up). The electrodeposition coating apparatus 2861 uses a heat pump 2004 equivalent to the heat pump 10 and so on. Although it becomes the same as that of 1 form, several heat pumps 2004p, 2004q, 2004r etc. are used, and the air compressor 2840 is provided. The electrodeposition coating apparatus 2861 includes a heat exchanger 2862 for heating hot water in the heating-side supply pipe 2034 of the heat pump 2004, a boiler (not shown) capable of supplying steam (hot water) ST to the heat exchanger 2862, and the steam ST A heat supply amount adjustment valve 2864 capable of adjusting the supply amount is provided (see FIG. 5B). The electrodeposition coating apparatus 2861 also includes a cooling tower 2832a for cooling the cooling water of the air compressor 2840, and a cold supply control valve 2866 for adjusting the cooling amount.

  A cooling tower 2832p or the like is connected to the heating side of the heat pump 2004p or the like via a supply-side motor valve 2047p or the like, a return-side motor valve 2049p or the like. In addition, the heating supply pipe 2034p such as the heat pump 2004p can be switched (or adjusted in flow rate) to the heating side supply pipe 2034 side of the heat pump 2004 by the motor valve 2047p. The heating return pipe 2036p such as the heat pump 2004p The valve 2049p can be switched to the heating side return pipe 2036 side of the heat pump 2004 (or the flow rate can be adjusted). Note that any one of the cooling towers 2832p and the like and the cooling tower 2832a may be common. Moreover, instead of switching to the cooling tower 2832a side, or together with this, the cooling water of the cooling tower 2832a and the hot water of the heat pump 10 may be subjected to heat exchange.

  Further, the cooling side motor valves 2043p, 2045p and the like of the heat pump 2004p and the like can be switched (or the flow rate can be adjusted) between the cooling side of the heat pump 2004 and the air compressor 2840 side in the cooling side circuit. When switched to the air compressor 2840 side, heat exchange with the cooling water of the air compressor 2840 is possible. In addition, motor valves 2043 and 2045 are also installed in order on the cooling side supply pipe 2030 and the cooling side return pipe 2032 of the heat pump 2004, and similarly switched between the electrodeposition tank 6 side and the air compressor 2840 side (or flow rate adjustment). ) It is possible. 4A and 4B, the circuit of the heat pump 2004p is omitted, and in FIG. 4C and FIG. 5A, the heating side circuit of the heat pump 2004p is omitted. These heating side circuits are actually connected to the degreasing tank 2 and the chemical conversion tank 4. The heat pump 2004p and the like can be heated by directly introducing the cold water of the heat pump 2004, and can operate as a heating heat pump for directly heating the cold water. On the other hand, a heat pump that heats a medium different from the chilled water of the heat recovery type heat pump and heats the chilled water through a heat exchanger operates as a cooling side heating medium supply heat pump (for example, FIG. An air-cooled heat pump 3102) for heating operation in a).

  Such an electrodeposition coating apparatus 2861 operates in the same manner as in the first embodiment, for example, as follows.

  That is, in the case of FIG. 4A at the time of cold heavy load or the like, the heat pump 2004 is performing the heat recovery operation in the hot water follow-up mode, but it is necessary to further supply cold heat to the electrodeposition tank 6, The cooling operation of the heat pump 2004p or the like is performed in a number corresponding to the number. At this time, the cooling side of the heat pump 2004p or the like is switched to the cooling side of the heat pump 2004, and the heating side of the heat pump 2004p or the like is switched to the cooling tower 2832p or the like side. If a plurality of heat pumps 2004p and the like are in cooling operation, all the heat pumps 2004p and the like are in a cooling operation state or a standby state for cooling operation. However, if there is a sufficient cooling capacity as a whole, one unit is set in a heating standby state.

  For example, cold water is supplied to the electrodeposition tank 6 at 7 degrees by a heat pump 2004, 2004p or the like, and returns to the heat pump 2004 at 12 degrees. At this time, the hot water supply temperature of the heat pump 2004 is 60 degrees, and the warm water return temperature is 55 degrees. The hot water supply temperature of the heat pump 2004p and the like is 35 degrees, and the warm water return temperature is 30 degrees by cooling of the cooling tower 2832p and the like. With the cooling, the heat pump 2004p and the like can continue the cooling operation.

  Further, in the case of FIG. 4B in the case of light and cold load, etc., when there is one heat pump 2004p or the like that performs cooling operation according to the load, the other one is put on standby for cooling, and the remaining heat pump 2004p or the like is warm water Wait for follow-up operation (heating operation). The heating side of the heat pump 2004p or the like in the warm water follow-up standby mode is switched from the cooling tower 2832p or the like side to the heating side of the heat pump 2004, and the cooling side is switched from the cooling side of the heat pump 2004 to the air compressor 2840 side. When the automatic control device detects a lack of heat, such as when the warm water return temperature or the warm water outlet temperature of the heat pump 2004 becomes equal to or lower than a predetermined value, the automatic control device operates the heat pump 2004p or the like waiting for warm water tracking. When the hot water follow-up operation is started even in one of the heat pumps 2004p or the like, the heat pump 2004p or the like that is in the cooling standby state is switched to the hot water follow-up standby state.

  For example, cold water is supplied to the electrodeposition tank 6 at 7 degrees by a heat pump 2004, a heat pump 2004p that performs cooling operation, or the like, and returns to the heat pump 2004 at 12 degrees. Here, although the hot water supply temperature of the heat pump 2004 is 60 degrees, when the warm water return temperature falls from 55 degrees to 53 degrees or less, the heat pump 2004p or the like waiting for warm water follow-up is operated, and the cold water is cooled to 30 degrees. 2840 and returned at 35 degrees by heat exchange with cooling water. Further, the heat pump 2004p or the like during the hot water follow-up operation heats the hot water returning to the heat pump 2004 to 60 degrees and returns it to the heating side supply pipe 2034 of the heat pump 2004. By applying the exhaust heat of the air compressor 2840 to the heat pump 2004p or the like during the hot water follow-up operation, the heat pump 2004p or the like can continue the heating operation.

  Furthermore, when the cooling load is small and the cooling pump output is less than the minimum cooling output (or a predetermined output exceeding this), the cooling side of the heat pump 2004 is switched to the air compressor 2840 side as shown in FIG. Then, the cold heat supply to the electrodeposition tank 6 by the heat pump 2004 is stopped. The cooling supply is performed by one heat pump 2004p or the like that performs cooling operation.

  For example, cold water is supplied to the electrodeposition tank 6 at 7 degrees by a heat pump 2004p or the like that performs cooling operation, and returns to the heat pump 2004 at 12 degrees. The heating side such as the heat pump 2004p that performs cooling operation is cooled by the cooling tower 2832p or the like so that the operation can be continued. The cold water supply temperature of the heat pump 2004 is 30 degrees, and the cold water return temperature is set to 35 degrees by heat exchange with the cooling water of the air compressor 2840, so that the hot water supply by the heat pump 2004 can be continued. On the other hand, the hot water side of the heat pump 2004 is appropriately heated by the heat pump 2004p or the like during the hot water follow-up operation, and the supply temperature is maintained at 60 degrees (the return temperature is around 55 degrees).

  In addition, when cooling is not required at the time of starting up the production line or the like, as shown in FIG. 5A, the heat pump 2004p or the like is placed in a hot water follow-up operation or in a standby state according to the thermal load, and the heat pump 2004 is also cooled. The side is switched to the air compressor 2840 side. However, when the automatic control device determines that cold water is likely to be required in the electrodeposition tank 6 from the temperature on the cooling side, the opening degree of various motor valves or the production status or the relationship thereof, the automatic control device includes the heat pump 2004p. One unit is in a cooling standby state.

  For example, the heating side of the heat pump 2004, 2004p, etc. returns at 55 degrees and is supplied at 60 degrees. The cooling side of the heat pump 2004, 2004p, etc. is heated from 30 degrees to 35 degrees with the cooling water of the air compressor 2840, and the operation of the heat pump 2004, 2004p, etc. is continued using the exhaust heat of the air compressor 2840. can do.

  In addition, when the production line is started up in the winter, when cooling is not required and the thermal load is large, as shown in FIG. 5B, the heat pump 2004p or the like is operated following hot water, and the cooling side including the heat pump 2004 is air-cooled. It is switched to the compressor 2840 side. Also, steam ST and the like are supplied from the boiler after adjustment by the heat supply amount adjustment valve 2864 by the heat load, and the hot water is heated through the heat exchanger 2862.

  Furthermore, when the amount of exhaust heat from the air compressor 2840 decreases due to a decrease in the air consumption of the factory and the heating on the cooling side such as the heat pumps 2004 and 2004p cannot be sufficiently performed, the cold water such as the heat pumps 2004 and 2004p is left as it is. The return temperature is lowered, and the heat pump 2004, 2004p and the like are stopped (for example, 5 degrees). Therefore, when the chilled water becomes a predetermined temperature (for example, 20 degrees) or less, the automatic control device stops the heat pumps 2004p and the like one by one to enter the warm water follow-up standby state, and maintains the cooling water temperature of the air compressor 2840. The decrease in the heating amount due to the stoppage of the heat pump 2004p or the like is compensated by the heating by the heat exchanger 2862. The output of the heat pump 2004, 2004p, etc. may be reduced by an inverter or the like to prevent the cooling water temperature of the air compressor 2840 from decreasing, or the flow rate of the hot water may be reduced by the inverter of the hot water pump, etc. The output of 2004p or the like may be reduced to prevent the cooling water temperature of the air compressor 2840 from decreasing, and the amount of heat in the heat exchanger 2862 may be increased to reduce the burden on the heat pumps 2004 and 2004p, etc. The amount of cold water heated may be reduced to prevent the cooling water temperature of the air compressor 2840 from decreasing, or the hot water supply temperature setting value of the heat pump 2004, 2004p, etc. may be lowered to reduce the output of the heat pump 2004, 2004p, etc. You may prevent the cooling water temperature of the air compressor 2840 from decreasing.

  In addition, when the amount of exhaust heat from the air compressor 2840 increases due to an increase in factory air consumption, etc., and the heating on the cooling side of the heat pumps 2004, 2004p, etc. becomes excessive, the cold water return from the heat pumps 2004, 2004p, etc. remains unchanged. The temperature rises and becomes a temperature at which the heat pumps 2004, 2004p and the like stop. In view of this, the automatic control device is configured such that when the chilled water is equal to or higher than a predetermined temperature or the cooling water temperature of the air compressor 2840 is equal to or higher than a predetermined temperature (for example, 35 degrees), If there is 2004p or the like, the heat pump 2004p or the like is operated to cool the cooling water, or the cooling tower 2832a is operated to keep the cooling water temperature from rising.

  For example, the cooling side of the heat pumps 2004, 2004p, etc. is supplied at 30 degrees and returns at 35 degrees. Further, the heating side of the heat pumps 2004, 2004p, etc. is supplied from 58 degrees to 60 degrees by the heat of the heat exchanger 2862, and returns at 53 degrees.

  In the electrodeposition coating apparatus 2861 described above, the cooling side of the heat pumps 2004 and 2004p and the like is automatically switched to the air compressor 2840 side according to the heating load and the cooling load, and the heat pump 2004 is exchanged with the cooling water of the air compressor 2840. , 2004p, etc., the cooling water can be used to continue the operation of the heat pumps 2004, 2004p, etc., and can be operated in a highly energy-saving state.

[Sixth form]
FIG. 6A is a schematic diagram of the electrodeposition coating apparatus 2871 according to the sixth embodiment when the cooling load is extremely large with respect to the heating load (for example, summer or production line stoppage process), and FIG. 6B is the electrodeposition. FIG. 6C is a schematic diagram in the case where the cooling load is larger than the heating load in the coating apparatus 2871 (for example, low tact time in summer), and FIG. 6C is a case where the heating load is larger than the cooling load in the electrodeposition coating apparatus 2871 ( For example, FIG. 7A and FIG. 7B are schematic diagrams in the case where an air-cooled heat pump fails in the electrodeposition coating apparatus 2871. The electrodeposition coating apparatus 2871 is the same as that in the fifth embodiment. It becomes.

  In addition, circuits such as the air cooling heat pump 2154a can be switched between the heating side and the cooling side of the heat pump 2004 by the motor valve 2043a and the motor valve 2045a and the like. 6 and 7, a part of the circuit between the electrodeposition tank 6 and the heat pump 2004 is omitted.

  In the electrodeposition coating apparatus 2871, cooling by the air cooling heat pump 2154a is anticipated, and the maximum cooling output of the heat pump 2004 is made smaller than the minimum cooling load.

  Such an electrodeposition coating apparatus 2871 operates in the same manner as in the fifth embodiment, for example, as follows.

  That is, in the case of FIG. 6A at the time of cold heavy heat load in summer, it is necessary to supply cold heat to the electrodeposition tank 6, and the cooling operation of the air-cooled heat pumps 2154a and the like is performed in the number corresponding to the cold load. At this time, the cooling side of the air cooling heat pump 2154a or the like is switched to the cooling side of the heat pump 2004. If a plurality of air-cooling heat pumps 2154a and the like are in cooling operation, all the air-cooling heat pumps 2154a and the like are placed in a cooling operation or cooling operation standby state. However, if there is a sufficient cooling capacity as a whole, one unit is set in a heating standby state.

  For example, cold water is supplied to the electrodeposition tank 6 at 7 degrees by the heat pump 2004, the air-cooled heat pump 2154a, etc., and returns to the heat pump 2004, the air-cooled heat pump 2154a, etc. at 12 degrees. At this time, the hot water supply temperature of the heat pump 2004 is 55 degrees, and the warm water return temperature is 50 degrees. Further, the cooling water temperature or the amount of cooling heat is controlled by cooling the returning cold water by the air cooling heat pump 2154a or the like or supplying it to the cooling side supply pipe 2030. For hot water, the temperature of the hot water or the amount of heating is controlled by operating the heat pump 2004 in the hot water follow-up mode (heat recovery operation).

  In the case of FIG. 6B at the time of light and cold load, etc., when the number of air-cooling heat pumps 2154a and the like that perform cooling operation according to the load is less than a predetermined number (one), cooling standby is performed for the other predetermined units (one). The remaining air-cooled heat pump 2154a and the like are put on standby for heating operation. The heating side of the air-cooled heat pump 2154a or the like that is waiting for heating is switched from the cooling side of the heat pump 2004 to the heating side. When the automatic control device detects a lack of isothermal heat at which the hot water return temperature of the heat pump 2004 is equal to or lower than a predetermined value, the automatic control device operates the air-cooled heat pump 2154a and the like that are on standby for heating. When the heating operation is started on a predetermined unit (one unit) or more of the air cooling heat pump 2154a and the like, the air cooling heat pump 2154a and the like that are on standby for cooling are switched to a heating standby state.

  For example, cold water is supplied to the heat exchanger of the electrodeposition tank 6 at 7 degrees by the heat pump 2004 or the air-cooled heat pump 2154a that performs cooling operation, and returns to the heat pump 2004, the air-cooled heat pump 2154a, etc. at 12 degrees. Here, although the hot water supply temperature of the heat pump 2004 is 55 degrees, when the warm water return temperature falls from 50 degrees to 48 degrees or less, the air-cooled heat pump 2154a or the like waiting for heating is operated, and the warm water returning to the heat pump 2004 is cooled with the air-cooled heat pump. Heat to 55 degrees with 2154a or the like, and return to the heating side supply pipe 2034 of the heat pump 2004 to eliminate the lack of heat.

  Further, when the cooling load is reduced due to winter or production conditions, as shown in FIG. 6C, the cooling by the heat pump 2004 is continued, and the air cooling heat pump 2154a or the like (one of them) is cooled and cooled. Adjust the load. Further, when the air-cooled heat pump 2154a or the like that is on standby for heating is operated according to the thermal load and the air-cooled heat pump 2154a or the like that is on standby for heating is operated, the air-cooled heat pump 2154a or the like that is on standby for cooling is switched to a standby state for heating. In the air cooling heat pump 2154a and the like, a cooling standby unit (one unit) may be provided.

  For example, cold water is supplied to the electrodeposition tank 6 at 7 degrees by the heat pump 2004 or an air-cooled heat pump 2154a that performs cooling operation, and returns to the heat pump 2004 at 12 degrees. The hot water supply temperature by the heat pump 2004 or the air-cooled heat pump 2154a during heating operation is 55 degrees, the warm water return temperature is 50 degrees, and the supply of hot water or cold water by the heat pump 2004 can be continued.

  In addition, when the air-cooling heat pump 2154a or the like during the cooling operation fails due to a trip or the like, as shown in FIG. 7A, the air-cooling heat pump 2154a or the like that is in the heating standby mode is switched to the cooling mode to prevent the cooling from being insufficient. To do.

  In the above electrodeposition coating apparatus 2871, the state of the air-cooled heat pump 2154a and the like is switched according to the heating load and the cooling load, and the heating and cooling by the heat pump 2004 is assisted, so the degreasing tank 2, the chemical conversion tank 4 and the electrodeposition tank 6 Heating or cooling can be performed accurately throughout the year, and the operation of the heat pump 2004 can be continued to operate the electrodeposition coating apparatus 2871 in a state of high energy saving.

[Seventh form]
FIG.7 (c) is a schematic diagram in the case where the thermal load is larger than the cold load in the electrodeposition coating apparatus 2881 according to the seventh embodiment, and the electrodeposition coating apparatus 2881 is similar to the fifth embodiment. The difference is that the maximum cooling output of the heat pump 2004 is set to be equal to or higher than the minimum cooling load.

  In the electrodeposition coating apparatus 2881, in the heat pump 2004 in the hot water follow-up operation, the cold load is returned because the cold load is not sufficiently utilized since the cold load is not sufficiently utilized. In such a case, the hot water of the (one) air-cooled heat pump 2154a during the heating operation is switched to the heat exchanger 2040 side, the cold water of the heat pump 2004 is heated by heat exchange, and the cold water of the heat pump 2004 is taken away. The balance with warm heat is maintained and the operation of the heat pump 2004 is continued. The circuit on the heating side of the heat pump 2004 may be branched to the heat exchanger 2040 side, and the cold water side of the heat pump 2004 may be heated by the branch circuit or the heat exchanger 2040.

  Even in such an electrodeposition coating apparatus 2881, the balance between cold and hot heat of the heat pump 2004 can be maintained and the operation of the heat pump 2004 can be continued, and the electrodeposition coating apparatus 2881 is appropriately used in an energy-saving state. Can drive to.

[Eighth form]
FIG. 8A is a schematic diagram in the case where the cooling load is very large with respect to the thermal load in the electrodeposition coating apparatus 2901 according to the eighth embodiment, and FIG. 8B is the cooling load in the electrodeposition coating apparatus 2901 which is the thermal load. FIG. 8C is a schematic diagram in the case where the thermal load is larger than the cold load in the electrodeposition coating apparatus 2901, and FIG. 9A is the cold heat in the electrodeposition coating apparatus 2901. FIG. 9B is a schematic diagram when there is no cooling load in the electrodeposition coating apparatus 2901 and the thermal load is relatively large. The electrodeposition coating apparatus 2901 is a fifth example. It becomes the same as the form. Note that some of the circuits are also omitted in FIGS.

  Similarly to the fifth embodiment, the electrodeposition coating apparatus 2901 includes an air compressor 2840 and a motor valve 2043 that switches the cooling side of the heat pump 2004 to the cooling water (waste water) side of the air compressor 2840. 2045 or a circuit.

  Such an electrodeposition coating apparatus 2901 operates in the same manner as in the fifth embodiment, for example, as follows.

  That is, in the case of FIG. 8A at the time of cold heavy load (for example, summer high tact time), it is necessary to supply cold heat to the electrodeposition tank 6, and the cooling operation of the air-cooled heat pumps 2154a and the like in the number corresponding to the cold load I do. At this time, the cooling side of the air cooling heat pump 2154a or the like is switched to the cooling side of the heat pump 2004. If a plurality of air-cooling heat pumps 2154a are in cooling operation, all the air-cooling heat pumps 2154a and the like are placed in a cooling operation or cooling operation standby state. However, if there is a sufficient cooling capacity as a whole, one unit is set in a heating standby state.

  For example, cold water is supplied to the heat exchanger of the electrodeposition tank 6 at 7 degrees by the heat pump 2004, the air-cooled heat pump 2154a, and the like, and returns to the heat pump 2004, the air-cooled heat pump 2154a, etc. at 12 degrees. At this time, the hot water supply temperature of the heat pump 2004 is 65 degrees, and the warm water return temperature is 60 degrees. In addition, the cooling load of the heat pump 2004 is reduced by cooling the return chilled water by the air cooling heat pump 2154a or the like or supplying it to the cooling side supply pipe 2030, and the heat pump 2004 can continue the cooling operation.

  Further, in the case of FIG. 8B at the time of light and cold load (for example, summer low tact time), when one air-cooling heat pump 2154a or the like that performs cooling operation according to the load becomes one unit, the other unit is put on cooling standby. The remaining air-cooled heat pump 2154a and the like are on standby for heating operation. The heating side of the air-cooled heat pump 2154a or the like that is waiting for heating is switched from the cooling side of the heat pump 2004 to the heating side. When the automatic control device detects a lack of isothermal heat at which the hot water return temperature of the heat pump 2004 is equal to or lower than a predetermined value, the automatic control device operates the air-cooled heat pump 2154a and the like that are on standby for heating. When heating operation is started even with one of the air cooling heat pumps 2154a and the like, the air cooling heat pump 2154a and the like that are on standby for cooling are switched to a heating standby state.

  For example, cold water is supplied to the heat exchanger of the electrodeposition tank 6 at 7 degrees by the heat pump 2004 or the air-cooled heat pump 2154a that performs cooling operation, and returns to the heat pump 2004, the air-cooled heat pump 2154a, etc. at 12 degrees. Here, although the hot water supply temperature of the heat pump 2004 is 55 degrees, when the warm water return temperature falls from 50 degrees to 48 degrees or less, the air-cooled heat pump 2154a or the like that is on standby for heating is operated and the warm water returning to the heat pump 2004 is 55 degrees. To the heating side supply pipe 2034 of the heat pump 2004 to solve the shortage of hot water.

  Furthermore, in the winter season, the cooling load is reduced, and the output of the air cooling heat pump 2154a or the like during the cooling operation is equal to or less than a predetermined value (a value corresponding to a predetermined ratio (25%) of the maximum output), or the cold water return temperature is predetermined. When the value is 10 degrees or less, as shown in FIG. 8C, the cooling side of the heat pump 2004 is switched to the air compressor 2840 side, and one unit such as the air cooling heat pump 2154a is cooled and electrodepositioned. Corresponds to the cooling load of the tank 6. Further, when the air-cooled heat pump 2154a or the like that is on standby for heating is operated according to the thermal load and the air-cooled heat pump 2154a or the like that is on standby for heating is operated, the air-cooled heat pump 2154a or the like that is on standby for cooling is switched to a standby state for heating. In the air cooling heat pump 2154a and the like, a cooling standby unit (one unit) may be provided.

  For example, the heat pump 2004 supplies hot water of 55 degrees to receive 50 degrees of return warm water, while supplying cold water of 30 degrees to the air compressor 2840 side and receives 35 degrees of return cold water by heat exchange with the cooling water. . Heating of the degreasing tank 2 and the chemical conversion tank 4 is performed by a heat pump 2004, and cooling of the electrodeposition tank 6 is performed by an air-cooled heat pump 2154a or the like during cooling operation (supply 7 degrees, return 12 degrees). The operation of the heat pump 2004 is continued by applying the waste water from the air compressor 2840 to the cooling side of the heat pump 2004.

  On the other hand, the output of the air-cooling heat pump 2154a or the like during the cooling operation becomes a predetermined value (a value corresponding to a predetermined ratio (85%) of the maximum output) or the cold water return temperature becomes a predetermined value (15 degrees) or more. In this case, the heat pump 2004 is temporarily stopped, the cold water side is switched to the cooling water side of the air compressor 2840, the hot water in the degreasing tank 2 and the chemical conversion tank 4 is covered with the air cooling heat pump 2154a, etc., and the heat pump 2004 is operated following the hot water. Supply cold and hot water.

  In addition, when there is no cooling load at the time of starting up the production line, etc., as shown in FIG. 9A, the air cooling heat pumps 2154a and the like are heated by the number corresponding to the heating load, and the rest is set in a heating standby state. In addition, when the opening degree of the cold heat supply amount adjustment valve 2048 exceeds a predetermined value or the production state becomes a predetermined value, the air cooling heat pump 2154a and the like are cooled down in order to cope with the resumption of cold water supply. Switch to standby mode.

  In the case where the thermal load is large, such as when the production line is started up in the winter, as shown in FIG. 9B, if the amount of heat of the hot water is small relative to the heating load, the heating side of the heat pump 2004 is connected to the steam ST from the boiler. It is heated by heat exchange to prevent insufficient heating. For example, when the hot water return temperature of the heat pump 2004 is 48 degrees and the hot water supply temperature is raised only to 53 degrees even by the air-cooled heat pump 2154a or the like during heating operation, the automatic control device grasps this case by using a temperature sensor or the like. The supply amount adjustment valve 2864 is operated, and warm water supplied by the steam ST is heated to 55 degrees.

  In the electrodeposition coating apparatus 2901 described above, the state of the air-cooled heat pump 2154a and the like is switched according to the heating load and the cooling load, and the heating and cooling by the heat pump 2004 are assisted, and when there is no cooling load, the cooling side of the heat pump 2004 is changed. In order to switch to the waste water side and to make the air cooling heat pump 2154a and the like stand by for cooling as necessary, the heat pump 2004 is continuously operated while heating or cooling the degreasing tank 2, the chemical conversion tank 4 and the electrodeposition tank 6 accurately, The electrodeposition coating apparatus 2901 can be operated in a state of high energy saving.

[Ninth embodiment]
FIG. 9C is a schematic diagram in the case where there is no cooling load in the electrodeposition coating apparatus 2911 according to the ninth embodiment. The electrodeposition coating apparatus 2911 is the same as in the eighth embodiment, but the cooling side circuit The switching is not performed by the motor valves 2043 and 2045, but is performed by the flow rate adjusting valve 2046 while exchanging heat with the cooling water of the air compressor 2840 by the heat exchanger 2040.

  Even in such an electrodeposition coating apparatus 2911, for example, the cooling water of 40 degrees of the air compressor 2840 can raise the temperature of 25 degrees of cold water of the heat pump 2004 to 30 degrees (the cooling water of the air compressor 2840 is 35 degrees). Therefore, it is possible to continue the operation of the heat pump 2004 that maintains a balance between heat and cold and is excellent in energy saving.

[Tenth embodiment]
FIG. 10 is a schematic view of an electrodeposition coating apparatus 3001 according to the tenth embodiment. The electrodeposition coating apparatus 3001 is the same as that of the fifth embodiment, but the hot water boiler 2506 and the hot water tank 2508 are on the heating side return pipe 2036 side. The chilled water pumps 3002a to 3002d or the hot water pumps 3006a to 3006d are installed in the cooling side return pipes 2032a to 2032d or the heating side return pipes 2036a to 2036d, respectively. Moreover, the heat pump 2004a is positioned as a cooling / heating load adjuster. In addition, although the cooling / heating load adjustment machine is one here, you may arrange | position several.

  The automatic control device of the electrodeposition coating apparatus 3001 controls, for example, the heat pump 2004b or the like based on its own hot water supply temperature, and controls the heat pump 2004a as a cold load adjuster based on its own hot water supply temperature and cold water supply temperature. The hot water boiler 2506 is controlled based on the temperature of the hot water tank 2508 or the hot water return temperature of the heating side return pipe 2036, and the flow rate adjusting valve 2046 for adjusting the cold water return temperature is controlled based on the cold water return temperature. The second hot heat supply amount adjusting valve 2109 for adjusting the hot water supply amount to the chemical conversion tank 4 or the cold heat supply amount adjusting valve 2048 for adjusting the cold water supply amount to the electrodeposition tank 6 is controlled based on the hot water temperature. These temperatures are detected by the respective temperature sensors and grasped by the automatic control device. The hot water not supplied to the degreasing tank 2 and the chemical conversion tank 4 is passed through the branch pipe 2110 from the second hot heat supply amount adjustment valve 2109.

  Such an electrodeposition coating apparatus 3001 operates in the same manner as in the fifth embodiment, for example, as follows.

  That is, as shown in FIG. 11, if there is a stop command for the degreasing tank 2 and the chemical conversion tank 4 (NO in step S1001), the automatic control device stops the heat pump 2004a and the like and the hot water boiler 2506 (steps S1002, 1003). ), The process is terminated.

  On the other hand, if there is no stop command (YES in step S1001), it is determined whether the opening degree of the flow control valve 2046 is 60% or less (step S1004). Since there is a surplus in the amount of heat, if the hot water boiler 2506 is not in operation, the process returns to the beginning (NO in step S1005). In the initial state, the heat pump 2004a is operating and the heat pump 2004b and the like are stopped.

  On the other hand, if hot water boiler 2506 is in operation (YES in step S1005), the process proceeds to loop 1 for increasing the opening degree of flow control valve 2046. That is, first, the flow rate in the hot water pump 3006a of the heat pump 2004a as the cold load adjusting machine is increased (step S1006). Then, since the hot water supply temperature of the heat pump 2004a is temporarily lowered, the heat pump 2004a automatically increases the output so that the hot water becomes the set temperature (60 degrees) (thermal follow-up operation, inverter output increase).

  As the hot water output increases, the chilled water output also increases accordingly, and the chilled water temperature decreases as it is, so that the automatic control device increases the opening of the flow control valve 2046 to a predetermined value (70%), The heat pump 2004a and the hot water boiler 2506 are set as follows so that the amount of heat exchange with the waste water X (35 degrees) is increased and the cold water return temperature (17 degrees, supply temperature 10 degrees) is maintained. Control.

  That is, the automatic control device checks whether or not the load of the heat pump 2004a is equal to or less than a predetermined ratio (95%) with respect to the maximum load (step S1007). If the load of the heat pump 2004a is not less than or equal to a predetermined ratio (NO), one of the heat pumps 2004b or the like that is not operating is activated (step S1008), and the process proceeds to step S1009. If the load of the heat pump 2004a is equal to or less than the predetermined ratio (YES in step S1007), the process proceeds to step S1009 without executing step S1008.

  Further, when the flow rate of the return warm water of the heat pump 2004a is increased, the flow rate of warm water to the degreasing tank 2 and the chemical conversion tank 4 is also increased, and the return temperature of the warm water rises. Therefore, by narrowing the output of the hot water boiler 2506 as another heat source, An appropriate temperature difference (at the time of maximum output of the heat pump 2004a, difference of 5 degrees) is ensured for the warm water return temperature.

  That is, in step S1009, the automatic control apparatus monitors whether or not the warm water return temperature has reached a predetermined value (56 degrees) or more. If the warm water return temperature is equal to or higher than the predetermined value, the loop 2 for lowering the warm water return temperature to the predetermined value (55 degrees) is executed. Otherwise, the head of the loop 1 (step S1007) or the head of the process (flow rate control valve) When the opening of 46 reaches a predetermined value, the process returns to step S1001). In the loop 2, the output of the hot water boiler 2506 is decreased (step S1010).

  For example, when a thermal load of 450 kW is provided, the heat pump 4a having a temperature difference of 5 degrees at a hot water flow rate of 43 tons provides 250 kW (43 × 5 divided by 860 kW / kcal), and the hot water boiler 2506 provides 200 kW. When the hot water flow rate is increased to 60.2 tons per hour from the existing state, the hot water supply temperature of the heat pump 2004a is temporarily lowered, and the inverter is restored to 350 kW (60.2 × 5/860) in order to recover the temperature to the set value. Although the hot water return temperature from the degreasing tank 2 and the chemical conversion tank 4 is increased, the output of the hot water boiler 2506 is reduced to 100 kW according to this, so that while maintaining the difference between the hot water supply and return temperature in the heat pump 2004a, 450 kW It can cope with thermal load.

  In contrast to the above, if the hot water return temperature is not adjusted by the hot water boiler 2506, the hot water supply temperature of the heat pump 2004a temporarily decreases even if the flow rate of the return hot water is increased. Increase the hot water supply temperature to the set value (70 degrees). Then, although the flow rate of the hot water at the set temperature temporarily increases and the amount of heat increases, since the heat consumption in the degreasing tank 2 and the chemical conversion tank 4 has not changed, the warm water return temperature increases and the supply temperature And the output of the heat pump 2004a is reduced by the hot water follow-up operation, so that it can be assumed that the heating output of the heat pump 2004a remains unchanged, and thus the cooling output does not increase.

  For example, when a heat load of 450 kW is covered, the temperature difference is 3 degrees even if the flow rate is increased to 129 tons per hour when the flow rate is increased to 129 tons per hour when the temperature difference is 5 degrees with the heat pump flow rate of 77.4 tons per hour, and the heating output changes at 450 kW. Absent. That is, when the flow rate is increased, the hot water supply temperature is temporarily lowered to 58 degrees, but the inverter output is increased because the warm water temperature is set to 60 degrees by the hot water follow-up operation, and the output is temporarily increased to 750 kW. However, since the load in the degreasing tank 2 and the chemical conversion tank 4 is 450 kW, warm heat is not used and the warm water return temperature rises, the temperature difference from the warm water supply temperature is reduced, and the warm water output of the heat pump 2004a is eventually reduced. And the load in the chemical conversion tank 4 is met.

  On the other hand, if the opening degree of the flow control valve 2046 is not equal to or less than the predetermined value (60%) (NO in step S1004), it is further checked whether the opening degree is equal to or greater than a specific value (80%) (step S1004). S1011), if not, return to the beginning of the process (step S1001), and if so, assume that the amount of heat of the waste water X is insufficient, and set the opening of the flow rate control valve 2046 between the predetermined value and the specific value. Execute loop 3 to reduce the value to 70% (70%).

  In the loop 3, the flow rate in the hot water pump 3006a of the heat pump 2004a is reduced (step S1012), and it is confirmed whether the load of the heat pump 2004a is equal to or greater than a predetermined ratio (50%) with respect to the maximum load (step S1013). If the load of the heat pump 2004a is not equal to or greater than the predetermined ratio, the automatic control device stops one of the heat pumps 2004b and the like that is in operation (step S1014), and proceeds to step S1015. Further, if the load of the heat pump 2004a is equal to or greater than the predetermined ratio, the automatic control device proceeds to step S1015 without executing step S1014.

  In step S1015, the automatic control apparatus monitors whether the warm water return temperature has become equal to or lower than a predetermined value (54 degrees). If the hot water return temperature is equal to or lower than the predetermined value, the loop 4 for raising the hot water return temperature to the predetermined value (55 degrees) is executed. Otherwise, the head of the loop 3 (step S1012) or the head of the process (flow rate control valve) When the opening of 2046 reaches a predetermined value, the process returns to step S1001). In loop 4, if the hot water boiler 2506 is not in the automatic operation mode, the mode is set (step S1016, S1017), and the output of the hot water boiler 2506 is increased (step S1018).

  By executing the loop 3 or the like, the flow rate of the hot water pump 3006a is reduced and the heating amount by the hot water boiler 2506 as another heat source is adjusted to appropriately maintain the temperature difference on the hot water side in the heat pump 2004a, and the cooling load Can respond appropriately.

  For example, when supplying a thermal load of 350 kW, if the heat pump 2004a, which has a temperature difference of 5 degrees at a hot water flow rate of 60.2 tons per hour, reduces the hot water flow rate to 43 tons per hour from a state where 350 kW is covered, the heat pump 2004a In order to lower the temperature to a set value, the temperature is reduced to 250 kW by an inverter, and the warm water return temperature from the degreasing tank 2 and the chemical conversion tank 4 is lowered. Accordingly, 100 kW heating by the hot water boiler 2506 is performed. Since it starts, it is possible to cope with a 350 kW thermal load while maintaining the difference between the hot water supply and return temperature in the heat pump 2004a at a difference of 5 degrees.

  In contrast, if the warm water return temperature is not adjusted by the warm water boiler 2506, for example, even if the flow rate of the warm water is reduced from 60.2 tons per hour to 43 tons per hour, the temperature difference eventually increases to 7 degrees and the heating output becomes 350 kW. Will not change.

  In the electrodeposition coating apparatus 3001 described above, when the opening degree of the flow control valve 2046 is equal to or greater than a predetermined value, the amount of heat of the exhaust hot water X is insufficient, and the heat pump 2004 is likely to stop because the heat balance is not balanced with the heat load. A part of the heat pump 2004 is stopped, the output of the hot water boiler 2506 is increased, and the opening of the flow rate control valve 2046 is less than a predetermined value (and the hot water boiler 2506 is operating), so that there is a margin in the amount of heat of the waste water X When the operation by the heat pump 2004 is possible, since the operation of the heat pump 2004 is started sequentially, the maximum number of heat pumps 2004 can be operated in a state in which the operation can be continued while appropriately responding to the thermal load, Improve the operation ratio of the heat pump 2004 to other heat sources as much as possible within the range that does not affect the operation. There can be subjected to electrodeposition coating in a state high energy saving property fluctuates.

  In addition, the electrodeposition coating apparatus 3001 is provided with other heat sources such as the exhaust hot water X and the hot water boiler 2506 and adjusts the flow rate of the medium with respect to the heat pump 2004 by the cold water pump 3002a and the hot water pump 3006a. The medium temperature or medium heat quantity can be controlled.

  Furthermore, in the electrodeposition coating apparatus 3001, a part of the plurality of heat pumps 2004 is used as a cold water load adjuster, and other heat pumps 2004 are additionally activated or stopped according to the load. It is possible to operate in a high load and efficient state within a range where the load is not excessive, and such an appropriate operation can be easily executed based on a simple index of the load of the cooling / heating load regulator. .

[Eleventh form]
FIG. 12 is a flowchart showing the operation of the electrodeposition coating apparatus according to the eleventh embodiment. The electrodeposition coating apparatus is the same as that of the tenth embodiment, but the cooling side return pipe 2032 (branch to the cooling side return pipe 32a). A cold water tank is provided on the upstream and upstream sides. Moreover, the cold water chiller which is not shown in figure is connected to the cooling side similarly to the 13th form (refer FIG. 14) mentioned later.

  Such an electrodeposition coating apparatus operates in the same manner as in the tenth embodiment, but the number of operating heat pumps 2004 can be changed based on the cold water return temperature in the cold water tank or the like instead of the opening degree of the flow rate control valve 2046. Increase or decrease the output of other heat sources.

  That is, if the cold water return temperature is equal to or higher than the specific value (17 degrees) (YES in step S1021) and the hot water boiler 2506 is in operation (YES in step S1005), the cold water return temperature is set to a predetermined value (15 degrees). Run loop 1 to lower. If hot water boiler 2506 is not in operation (NO in step S1005), the cold water chiller is operated (step S1022).

  If the chilled water return temperature is equal to or lower than the specific value (13 degrees) (YES in step S1023), the loop 3 is used to raise the chilled water return temperature to a predetermined value (15 degrees, which may be different from the predetermined value when lowered). Execute. Before step S1012, it is confirmed whether or not the chilled water chiller is in operation (step S1024). If it is in operation (YES), one chilled water chiller is stopped (step S1025) at the end of loop 3. If it shifts and it is not in operation (NO), Step S1012 is executed.

  Also in the electrodeposition coating apparatus according to the eleventh embodiment, as in the electrodeposition coating apparatus 3001 according to the tenth embodiment, the maximum number of heat pumps 2004 are operated in a state where operation can be continued while appropriately responding to the thermal load. It is possible to improve the operation ratio of the heat pump 2004 to the other heat source as much as possible without affecting the operation, and to perform the electrodeposition coating in a state of high energy saving even if the thermal load fluctuates.

[Twelfth embodiment]
FIG. 13 is a flowchart showing the operation of the electrodeposition coating apparatus according to the twelfth embodiment. The electrodeposition coating apparatus is the same as in the eleventh embodiment, but the hot water tank connected to the hot water boiler 2506 is connected to the heating side. It is interposed in both the supply pipe 2034 and the heating side return pipe 2036 (between the junction branch and the second warm heat supply amount adjustment valve 2109), and the heating side between the warm water tank and the degreasing tank 2 and the chemical conversion tank 4 The supply pipe 2034 is provided with a pump for supplying hot water from the hot water tank to the degreasing tank 2 and the chemical conversion tank 4 (second heat supply amount adjustment valve 2109).

  In the twelfth electrodeposition coating apparatus, one or more cold water chillers for directly cooling cold water or cooling a medium for cooling the cold water are installed. The cold water side of the cold water chiller is connected in the same manner as the heat pump 2004. The cooling chiller is connected to a cooling tower that is independent from the hot water circuit of the heat pump 2004 in order to cool the heat generated during cooling, but it may be an air cooling type that does not require a cooling tower. An exhaust heat recovery type heat pump (preliminary machine) may be used as a cold water chiller.

  Such an electrodeposition coating apparatus operates in the same manner as in the eleventh embodiment, but the chilled water temperature can be controlled by the chilled water chiller in addition to (increase or decrease) the number of heat pumps 2004.

  That is, if the cold water return temperature is equal to or higher than the specific value (17 degrees) (YES in step S1021) and the hot water boiler 2506 is not in operation (NO in step S1005), the cold water chiller is operated (step S1031). If hot water boiler 2506 is in operation (YES in step S1005), loop 1 is executed to lower the cold water return temperature to a predetermined value (15 degrees). In loop 1, the hot water in the hot water tank is When the temperature is equal to or higher than a predetermined value (60 degrees), loop 2 is executed (step S1032). Also in the loop 3, when the temperature of the hot water tank is equal to or lower than a predetermined value (57 degrees), the loop 4 is executed (step S1033).

  In addition, the process which concerns on the electrodeposition coating apparatus of 12th form can be changed as follows. That is, in step S1006, the hot water temperature set value of the heat pump 2004a as the chilled water load adjuster is increased (upper limit can be set, 60 degrees). As a result, the output of the heat pump 2004a and the like automatically increases (inverter output increase) and the chilled water output also increases accordingly, so that the chilled water temperature is maintained while temporarily decreasing. Further, since the temperature of the warm water going to the warm water tank 2508 rises and the temperature of the warm water in the warm water tank 2508 rises, the output of the other heat source (warm water boiler 2506) is reduced to balance the heat load and the heat supply amount. The hot water temperature is maintained at a predetermined temperature (60 degrees) by the heat supply adjustment by another heat source, the hot water return temperature of the heat pump 2004a or the like does not change, and the difference between the hot water return temperature and the hot water return temperature changes. For example, suppose that when the thermal load of 450 kW is provided by the output of 250 kW of the heat pump 2004a and the like that covers a temperature difference of 5 degrees at 43 tons / hour and the output of another heat source covers a thermal load of 450 kW, the hot water flow rate is the same and the temperature difference becomes 7 degrees. The output of the heat pump 2004a etc. is increased to 350 kW, and the output of the other heat source is automatically reduced to 100 kW. In the case where the hot water temperature in the hot water tank 2508 is not controlled without using another heat source, the output of the heat pump 2004a or the like does not change even if the hot water temperature is increased.

  On the other hand, in step S1012, the hot water temperature set value of the heat pump 2004a as the chilled water load adjuster is lowered (lower limit can be set, 55 degrees). As a result, the hot water output of the heat pump 2004a or the like automatically decreases (inverter output decrease), and the chilled water output also decreases accordingly, so the chilled water temperature temporarily rises. Further, since the temperature of returning to the hot water tank 2508 is lowered and the temperature of the hot water in the hot water tank 2508 is lowered, the output of the other heat source (hot water boiler 2506) is increased to cover a temporary shortage of the amount of heat supplied to the heat load. The warm water temperature in the warm water tank 2508 is maintained at a predetermined temperature (60 degrees) by adjusting the warm heat supply by another heat source, the warm water return temperature of the heat pump 2004a or the like does not change, and the difference between the warm water return temperature and the warm water return temperature varies. For example, if the temperature of the hot water flow rate is 43 tons per hour and the temperature difference is 5 degrees with the output 350 kW of the heat pump 2004a, etc., which covers a temperature difference of 350 kW, and the temperature difference is 5 degrees, the output of the heat pump 2004a, etc. Decreases to 250 kW and the output of the other heat source is automatically increased to 100 kW. Note that when the hot water temperature in the hot water tank 2508 is not controlled without using another heat source, the output of the heat pump 2004a and the like does not change even if the hot water flow rate is reduced.

On the other hand, in step S1006, the hot water temperature setting value of the hot water boiler 2506 as another heat source can be lowered by a predetermined value (1 degree, 62 degrees to 61 degrees) (lower limit can be set, 55 degrees). As a result, the hot water supply temperature temporarily decreases and the hot water return temperature also decreases (57 degrees to 56 degrees). In addition, since the heat pump 2004a and the like control the hot water supply temperature to a set value (60 degrees), the output is automatically increased by decreasing the hot water return temperature (by increasing the temperature difference from 3 degrees to 4 degrees ). Further, when the output of the heat pump 2004a or the like is increased in order to respond to the increased heating load, the chilled water output increases accordingly, so that the chilled water temperature is lowered and the chilled water temperature is maintained. For example, suppose that when the thermal load is 350 kW with the output 150 kW of the heat pump 2004a etc. that covers a temperature difference of 3 degrees at 43 tons / hour of hot water flow and the output of 200 kW of other heat sources, the hot water flow rate is the same and the temperature difference becomes 4 degrees. The output of the heat pump 2004a etc. is increased to 200 kW, and the output of other heat sources is automatically reduced to 150 kW.

  On the other hand, in step S1012, the hot water temperature setting value of the hot water boiler 2506 as another heat source can be increased by a predetermined value (1 degree) (lower limit can be set, 55 degrees). Thereby, warm water output of heat pump 2004a etc. falls temporarily, and cold water output also falls. In addition, when the hot water supply temperature to the pretreatment tank rises and the hot water return temperature also rises (55 degrees to 56 degrees), the heat pump 2004a and the like control the hot water supply temperature to the set value (60 degrees). The output is automatically reduced by the increase (because the temperature difference decreases from 5 degrees to 4 degrees). For example, in the case where the output of 350 kW such as the heat pump 2004a that covers a temperature difference of 7 tons at a flow rate of 43 tons per hour is covered, and the temperature difference of the heat source becomes 5 degrees by raising the set temperature of the other heat source, If the output of the heat pump 2004a, etc. is reduced to 250 kW, the output of the other heat source is 100 kW, and if the set temperature of the other heat source is further increased, the flow rate of the hot water becomes the same, but the temperature difference becomes 4 degrees, the output of the heat pump 2004a, etc. The power is reduced to 200 kW, and the output of the other heat source is 150 kW.

  In the electrodeposition coating apparatus according to the twelfth embodiment, as in the electrodeposition coating apparatus according to the eleventh embodiment, the maximum number of heat pumps 2004 are operated in a state where operation can be continued while appropriately responding to the thermal load. The cold water temperature can be adjusted before the number of heat pumps 4 is reduced by installing a cold water chiller, and the operation ratio of the heat pump 2004 to other heat sources is improved more finely as much as possible without affecting the operation. Even if the thermal load fluctuates, the electrodeposition coating can be executed in a state of high energy saving.

[13th form]
FIG. 14 is a schematic diagram of an electrodeposition coating apparatus 3051 according to the thirteenth embodiment. The electrodeposition coating apparatus 3051 is the same as the tenth embodiment, but is similar to the chilled water chillers 3052a and 3052b of the twelfth embodiment. Are installed. The cold water chiller 3052a and the like are connected to the cooling tower 2504c and the like through a hot heat transfer pipe 3054a and the hot return pipe 3056a and the like. A pump 3057a and the like are disposed on the warm return pipe 3056a and the like. A single cold water chiller may be used. The electrodeposition coating apparatus 3051 has a hot water tank 3058 similar to that in the tenth embodiment.

  Furthermore, the heat pumps 2004a and 2004b can perform a cold water follow-up operation in which the temperature of the cold water or the cold heat is constant, and the heat pumps 2004a and 2004b are positioned as thermal load regulators. The number of heat pumps 2004 may be one or three or more.

  The automatic control device of the electrodeposition coating apparatus 3051 controls the heat pumps 2004a and 2004b serving as the thermal load regulators based on their own cold water supply temperature and hot water supply temperature, for example, the temperature of the hot water tank 3058 or the heating side for the hot water boiler 2506. Control based on the hot water supply temperature of the supply pipe 2034 and adjust the cold water supply amount to the second hot water supply amount adjustment valve 2109 or the electrodeposition tank 6 to adjust the hot water supply amount to the degreasing tank 2 and the chemical conversion tank 4 The supply amount adjusting valve 2048 is controlled based on the hot water temperature. These temperatures are detected by the respective temperature sensors and grasped by the automatic control device.

  Such an electrodeposition coating apparatus 3051 operates in the same manner as the tenth and twelfth embodiments, for example, as follows.

  That is, as shown in FIG. 15, if the hot water supply temperature of the heat pump 2004 is 58 degrees or less (YES in step S1051), the automatic control device loops 1 to raise the hot water supply temperature to a predetermined temperature (60 degrees). If the hot water supply temperature of the heat pump 4 is equal to or higher than the specific temperature (62 degrees) and the hot water boiler 2506 is stopped (NO in step S1051, YES in both steps S1060 and S1061), the hot water supply temperature is set to a predetermined value. Execute loop 3 to lower the temperature (60 degrees). If NO in step S1061, the output of hot water boiler 506 is reduced (step S1062), and the process returns to the beginning.

  In the loop 1, the automatic control device increases the flow rate of the chilled water pump 3002a of the heat pumps 2004a and 2004b as the thermal load adjuster (step S1052), and if the chilled water supply temperature is equal to or lower than the specific temperature (7 degrees) (in step S1053). YES), the output of the chilled water chillers 3052a and 3052b is decreased to include the chilled water supply temperature at a predetermined temperature (10 degrees) (including reducing the number of units, step S1054), and the loop 2 is executed to execute the hot water supply temperature of the heat pump 2004 Is determined to fall within a predetermined temperature range from the predetermined temperature (60 degrees) (step S1055). On the other hand, if “NO” in the step S1053, the process proceeds to the step S1055 without executing the loop 2.

  If “YES” in the step S1055, the output of the hot water boiler 2506 is reduced (step S1056), and the process returns to the beginning of the loop 1. On the other hand, if “NO” in the step S1055, it is confirmed whether or not the load of the heat pump 2004a is equal to or less than a predetermined value (95% of the maximum load) (step S1057). The output of hot water boiler 2506 is increased (step S1058), and the process returns to the beginning.

  That is, in the loop 1, when the flow rate of the chilled water pump 3002a of the heat pumps 2004a and 2004b as the thermal load regulator is increased, the chilled water supply temperature of the heat pumps 2004a and 2004b temporarily rises, and the chilled water supply temperature of the heat pumps 2004a and 2004b is increased. The heat pumps 2004a and 2004b automatically increase the output so as to reach a predetermined temperature (10 degrees) (inverter output increase). If the cold water output of the heat pumps 2004a and 2004b increases, the hot water output also increases, so the hot water temperature is maintained at a predetermined value.

  On the other hand, in the loop 3, the automatic control device reduces the flow rate of the chilled water pump 3002a of the heat pumps 2004a and 2004b (step S1063), and determines whether or not the chilled water supply temperature is equal to or higher than the specific temperature (13 degrees) (step S1064). . If YES, the loop 4 for lowering the cold water supply temperature to a predetermined temperature (10 degrees) is executed, and if NO, the loop 4 is not executed and the process returns to the beginning of the loop 3. In the loop 4, the output of the chilled water chillers 3052a and 3052b is increased or the number is increased (step S1065).

  That is, in the loop 3, when the flow rate of the chilled water pump 3002a of the heat pumps 2004a and 2004b as the thermal load adjuster is decreased, the chilled water supply temperature of the heat pump 2004a is temporarily lowered, and the chilled water supply temperature of the heat pumps 2004a and 2004b is set to a predetermined temperature ( 10 degrees), the heat pumps 2004a and 2004b automatically reduce the output (decrease in inverter output). If the chilled water output of the heat pumps 2004a and 2004b decreases, the hot water output also decreases, so the chilled water chillers 3052a and 3052b compensate for the lack of cold heat.

  In addition, the process in the electrodeposition coating apparatus 3051 can be changed as follows. That is, in step S1052, the cold water temperature set value of the heat pump 2004a, which is a hot water load adjuster, is lowered. As a result, the output of the heat pump 2004a or the like automatically increases (inverter output increase), and the hot water output also increases accordingly, so the hot water temperature rises and the hot water temperature is maintained. Further, since the chilled water going temperature is lowered and the chilled water return temperature is temporarily lowered, the output of the chilled water chiller is reduced (step S1054) and balanced with the cooling load. On the other hand, in step S1063, the cold water temperature set value of the heat pump 2004a or the like that is a hot water load adjuster is increased. As a result, the output of the heat pump 2004a and the like is automatically throttled (inverter output decreased), and the hot water output is also reduced, so that the amount of supplied hot heat is reduced and the hot water temperature is lowered. Moreover, since the chilled water going temperature rises and the chilled water return temperature rises temporarily, the output of the chilled water chiller is increased (step S1065) to balance the cooling load.

  Since the above-described electrodeposition coating apparatus 3051 includes the heat pump 2004 that performs the cold water follow-up operation and the cold water chillers 3052a and 3052b, the cold water follow-up operation can be performed while appropriately responding to the thermal load in the electrodeposition coating with the cold heat load throughout the year. Electrodeposition coating can be carried out in a state of extremely high energy saving.

  Further, in the electrodeposition coating apparatus 3051, the flow rate of the medium with respect to the heat pump 2004 is adjusted by the cold water pump 3002a or the like, so that the medium temperature or the heat quantity of the medium can be controlled by adjusting the flow rate.

  Furthermore, in the electrodeposition coating apparatus 3051, the plurality of heat pumps 2004 are used as a thermal load adjuster, and the hot water boiler 2506 and the like are started and stopped in accordance with the load, and thus the hot water boiler 2506 and the like are operated in an efficient state. In addition, such an appropriate operation can be easily executed based on a simple index of the load of the cold load regulator.

[14th form]
FIG. 16 is a schematic diagram of an electrodeposition coating apparatus 3101 according to the fourteenth embodiment, and the electrodeposition coating apparatus 3101 is the same as the first embodiment, but the single electrode on the cooling side or the chilled water chiller of the thirteenth embodiment A plurality of air-cooled heat pumps 3102 are provided. In the air cooling heat pump 3102, heating operation or cooling operation is possible. On the cooling side, a cold water tank 3104 connected to the pipes 16 and 26 is installed.

  Pipes 3116 and 3126 for the electrodeposition tank 6 are further connected to the cold water tank 3104, a pump 3152 is interposed in the pipe 3116, and a heat exchanger 3130 is interposed in the pipe 3126. A medium supply pipe 3160 for supplying a medium to the heat exchanger 3130 and a medium return pipe 3162 for receiving the medium from the heat exchanger 3130 are connected to the air cooling heat pump 3102. A second heat exchanger 3164 is interposed in the medium supply pipe 3160, and a pump 3166 is interposed in the medium return pipe 3162. Another auxiliary heat source (steam here) H is introduced into the second heat exchanger 3164 via the auxiliary flow rate adjustment valve 3180.

  The heat exchanger 3130 may be installed in the pipe 26 or the cold water tank 3104. Alternatively, the air cooling heat pump 3102 and the tank 3104 may be connected to each other via a dedicated pump, and the air cooling heat pump 3102 may directly exchange heat. Further, the air cooling heat pump 3102 may be directly connected to the pipe 3126 to control the return temperature of the medium at the time of mode switching. In addition, the other auxiliary heat source H can be a cooler or a coolable / warmable machine.

  The electrodeposition coating apparatus 3101 according to the fourteenth embodiment operates as follows, for example, in order to smoothly perform heating / cooling operation switching.

  That is, as shown in FIG. 16 (a), when the heating load (350 kW) is heavier than the cooling load (170 kW), the heat pump 10 supplies hot water corresponding to the heating load, and the accompanying cold water is generated. (220 kW). In order to balance the cold water with respect to the hot water, the air-cooled heat pump 3102 is heated to supply a medium (from 30 degrees to 35 degrees) to the heat exchanger 3130 for warm water heating (50 kW). The chilled water temperature (cold water temperature in the pipes 16 and 3116) is 20 degrees, the chilled water temperature in the pipe 3126 immediately after returning from the electrodeposition tank 6 is 24 degrees, and the chilled water temperature after passing through the heat exchanger 3130. The cold water return temperature to the heat pump 10 is 25 degrees, and the operation of the heat pump 10 is continued.

  On the other hand, as shown in FIG. 16B, when the thermal load is reduced (becomes 254 kW) or the like, and the balance between the cold heat and the warm heat becomes unbalanced, the automatic control device sets the cold water going-out temperature to a predetermined value (22 degrees). ) This case is grasped by detecting the above, and the air cooling heat pump 3102 is temporarily stopped for operation switching, while the pump 3166 of the medium return pipe 3162 is continuously operated. Switching between the heating mode and the cooling mode in the air-cooling heat pump 3102 is not immediately executable, and needs to be restarted in a different mode after being stopped (device interlock) for a predetermined time (3 minutes). Due to the continuous operation of the pump 3166, heat exchange in the heat exchanger 3130 between the medium and cold water is continued, and the heated medium is cooled with cold water (medium 35 to 28 degrees, cold water return temperature 26 degrees). By cooling the medium when switching the operation, it is possible to more smoothly switch from the heating mode to the cooling mode as compared with the case where the medium is not cooled, so that the cooling operation can be started smoothly.

  That is, in order for the air-cooled heat pump 3102 to start operation in the cooling mode, the chilled water outlet temperature must be, for example, 20 degrees or less in order to establish the heat pump cycle, and if the medium is 35 degrees, first, for example, up to 30 degrees The temperature must be lowered from 30 degrees to 20 degrees in the mode for switching the operation of the air cooling heat pump 3102 by an external cooler or the like (it takes about 30 minutes). Without having to rely on the heat, the temperature can be quickly lowered to 30 degrees by heat exchange between the medium and the cold water, and the transition to the warming operation can be made unnecessary, and the time required for result switching can be greatly shortened. it can. If the medium is cooled by using another auxiliary heat source that can be cooled, switching can be performed more quickly.

  And as shown in FIG.16 (c), when a cooling load (170 kW) is heavy with respect to a heating load (250 kW), the air-cooling heat pump 3102 performs a cooling operation and supplies the medium 13 kW cooled by 18 degree | times. On the other hand, the heat pump 10 supplies 157 kW of 20 degrees cold water to the cold water tank 3104, and the cold water tank 3104 supplies cold water of 20 degrees to the electrodeposition tank 6 via the pump 3152 according to the cooling load. The cold water of 24 degrees returned from the electrodeposition tank 6 becomes 23.6 degrees by the medium (cold heat 13 kW) from the air-cooled heat pump 3102 and returns to the heat pump 10 through the cold water tank 3104. Thus, the cold load 170 kW of the electrodeposition tank 6 is covered by cold water (157 kW) and cooling by the medium (13 kW). On the other hand, the heat pump 10 supplies a heat of 250 kW commensurate with the cooling load 157 kW related to the cold water supply, and corresponds to the heat load.

  In this case, when the thermal load is relatively increased or when switching from cooling to heating, an operation just opposite to the switching from heating to cooling described above is performed. That is, when the air-cooled heat pump 3102 is switched from the cooling operation to the heating operation in order to prevent the operation stop due to the chilled water temperature drop of the heat pump 10, it takes time to restart due to the device interlock, and the medium temperature is equal to or lower than the predetermined temperature (25 degrees). In order to establish the heat pump cycle, it is necessary to operate in the warming mode before switching the heating mode to 25 degrees (approximately 30 minutes is required). However, in the electrodeposition coating apparatus 3101, the medium and the cold water First, it can be quickly raised to about 20 degrees by heat exchange, and the heating in the warming mode can be omitted by heating the medium using another auxiliary heat source H to raise the temperature from 20 degrees to 25 degrees. The time required for switching can be greatly reduced. The medium can be heated to 25 degrees only by heating the other auxiliary heat source H, and the cold water of the heat pump 10 is heated by the other heat source H during the mode switching of the air-cooled heat pump 3102 (about 3 minutes). Thus, it is possible to prevent the heat pump 10 from stopping.

  In the electrodeposition coating apparatus 3101 described above, the medium of the air-cooled heat pump 3102 is circulated even during the operation switching of the air-cooled heat pump 3102 on the cooling side of the heat pump 10, so that the medium is cooled by the cold water of the heat pump 10 at the time of cooling switching. In some cases, the temperature of the medium can be positively adjusted to a state suitable for the mode after switching as compared with the case where the temperature is not changed because nothing is applied to the medium by being heated by the cold water. Switching and operation after switching can be made extremely smooth.

  Further, in the electrodeposition coating apparatus 3101, the medium is heated (cooled) when the heating (cooling) is switched by the other auxiliary heat source H, so that the operation can be switched more quickly.

[15th form]
The electrodeposition coating apparatus 3201 according to the fifteenth embodiment shown in FIG. 17A uses a heat pump type hot water heater 3204 instead of the heat pump 10, and after coating instead of a heating medium for heating the degreasing tank 2 or the chemical conversion tank 4. This is the same as in the third embodiment except for heating the makeup water to the washing booth (here, a hot water washing booth with pure water, but it may be a washing booth or the like). The heat pump type water heater 3204 is a water heat source, preferably a CO ₂ refrigerant, but may be an R410A refrigerant or the like. The heat pump hot water heater 3204 can generate hot water having a high temperature of about 90 degrees from a low temperature return hot water (25 degrees), but if the hot water return temperature becomes higher than about 45 degrees, the heat pump cycle is 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 hot water heater 3204 is used as it is for hot water generation, the hot water temperature of about 65 degrees is required to generate hot water of 60 degrees, the return hot water temperature is 55 degrees, and a good operation state is not achieved. .

  Therefore, as in the third embodiment, the hot water pump 1166 is automatically adjusted so that the hot water temperature is 70 degrees and the hot water return temperature is equal to or lower than a predetermined temperature (35 degrees), so that the heat pump water heater 3204 is operated efficiently. Let it continue. For example, in order to maintain the warm water temperature at 70 degrees, the warm water temperature goes to 70 degrees (heating 13 kW, COP 3.0), and the heating of the other heat source Z is 0 kW. 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 1166. When the hot water circulation amount is reduced in order to make the warm water return temperature 35 ° C. or less, when the heating amount of the makeup water is insufficient, reheating is performed by the other heat source Z. In addition, in order not to use the other heat source Z as much as possible, it is set as the capacity | capacitance which warm water return temperature falls sufficiently about the heat exchanger 1164. FIG.

  An example of the operation of the automatic control device in such control will be described again based on FIG. 18 and the like. First, the automatic control device grasps whether or not the electrodeposition coating device 3201 is in operation (step S1101). If not in operation (No), the hot water pump 1166 and the heat pump water heater 3204 are stopped (steps S1102 and S1103), and the process is terminated.

  On the other hand, if it is Yes in step S1101, the automatic control device checks whether or not the pump 1115 is in operation (step S1104), and if not in operation (No), the hot water pump 1166 is in operation. This is stopped only at times (steps S1105 and S1106), and the process returns to the beginning (step S1101). If YES in step S1104, the heat pump type hot water heater 3204 is activated only when it is stopped (steps S1107 and S1108), and is activated only at the minimum number of revolutions when the hot water pump 1166 is not in operation. (Steps S1109 and S1110), it is checked whether the hot water return temperature of the heat pump hot water heater 3204 exceeds a predetermined value (35 degrees) (Step S1111).

  When the hot water return temperature of the heat pump hot water heater 3204 exceeds the set value (Yes), the automatic control device reduces the flow rate in the hot water pump 1166 by inverter control (step S1112). By the inverter control for reducing the return hot water flow rate, the temperature of the hot water returning to the heat pump type water heater 3204 is maintained at a predetermined value or less. Then, the process returns to the beginning (step S1101).

  On the other hand, if the hot water return temperature of the heat pump hot water heater 3204 does not exceed the set value (No), the automatic control device determines whether the temperature of the makeup water that has passed through the heat exchanger 1164 is lower than the set value by more than 5 degrees. (Step S1113), and if only Yes, the flow rate in the hot water pump 1166 is increased by inverter control (step S1114). By the inverter control that increases the return hot water flow rate, the warm water heating amount can be increased when the warm water temperature is low (the warm water heating amount is small) and the warm water temperature has a margin below the set value. After this, the process returns to the beginning (step S1101).

  In such an electrodeposition coating apparatus 3201 of the fifteenth embodiment, the hot water pump 1166 adjusts the amount of heat of hot water to lower the temperature of the returned hot water, so that the heat pump water heater 3204 that performs extremely efficient operation is used to generate hot water. It can be used continuously.

[16th form]
The electrodeposition coating apparatus 3221 according to the sixteenth embodiment shown in FIG. 17 (b) is the same as the fifteenth embodiment except that a heat pump water heater 3224 as an air heat source is used instead of the heat pump water heater 3204 as a water heat source. Even in the sixteenth embodiment, control can be performed in the same manner as in the fifteenth embodiment, and an extremely efficient operation of the heat pump hot water heater 3204 for generating hot water can be continued.

  In addition, when the exhaust belonging to the factory is introduced into the air heat exchanger of the heat pump hot water heater 3224, the efficiency is further improved (from COP3.0 when the outside air is 6 degrees to COP3.8 when the exhaust air is 25 degrees). .

[17th form]
The electrodeposition coating apparatus according to the seventeenth embodiment showing an example of the operation in FIG. 19 is the same as the first embodiment. This electrodeposition coating apparatus operates in the same manner as in the first embodiment, and also starts, stops, and switches as shown below.

  That is, when the automatic control device of the pretreatment electrodeposition coating apparatus receives an activation command by pressing the activation button (activation PB “ON”) or the like, first, loop 1 and steps S1201 and loop 2 are executed in parallel.

  When the temperature of the electrodeposition liquid is lower than the set value (28 degrees) in step S1201 (YES in step S1201), the automatic control device executes loop 2 for raising the electrodeposition liquid to the set temperature, Heating is performed by (an electrodeposition tank warming device for supplying the feed) (step S1202).

  At the same time, in the loop 1, the automatic controller raises the temperature of the pretreatment liquid by steam heating until it reaches a predetermined temperature (57 degrees of degreasing liquid and 42 degrees of chemical conversion liquid) (step S1203). Next, the automatic control device confirms that the pretreatment liquid has reached the predetermined temperature (YES in step S1204), and starts sequential work input to the pretreatment process (step S1205).

  Then, when the automatic control device grasps that energization has occurred in the electrodeposition tank 6 and the work has been put into the electrodeposition tank 6 (YES in step S1206), the heat pump 10 is operated in the cold water follow-up mode (step S1206). S1207) After confirming whether or not a predetermined time (30 minutes) has elapsed (whether the predetermined condition regarding sufficient cooling load has been satisfied) has elapsed (YES in step S1208), the heat pump 10 is switched to the hot water follow-up mode ( Step S1209). It should be noted that, regarding step S1208 or the predetermined condition, the cold energy adjustment amount (opening degree of the cooling medium adjustment valve) in the cold heat adjusting means for switching the cold heat amount of the cooling medium to the electrodeposition tank 6 may be a predetermined amount or more. The cooling load may be a predetermined value or more.

  Thus, by starting the heat pump 10 in the cold water follow-up mode and switching to the hot water follow-up mode after the electrodeposition tank 6 starts operating in earnest, the cooling load at the start-up of the production line is small and the heating load is relatively low. A large state can be accommodated by cooling operation, and in a state where the factory exhaust heat is low at the start-up of the production line, the heat follow-up operation is performed with insufficient heating due to exhaust heat on the cooling side of the heat pump 10. It is possible to prevent an inefficient operation or a situation where the operation is stopped, and a timing at which sufficient exhaust heat is present and the continuation of the heat follow-up operation of the heat pump 10 is sufficiently possible or cooling in the electrodeposition tank 6 is performed. It becomes possible to start the thermal follow-up operation which is energy saving at the timing when the required state is reached.

  Further, when the automatic control device grasps that the state in which no workpiece is carried into the pretreatment tank has continued for a specific time (10 minutes) (YES in step S1210), the heat pump 10 is switched to the cold water tracking mode (step S1211), and further After the state in which no workpiece is carried into the electrodeposition tank 6 continues for a specified time (5 minutes) (YES in step S1212), it is confirmed whether or not an operation stop command for the pretreatment electrodeposition coating apparatus has been issued (step S1213). . If a stop command has not been issued (NO), the process returns to step S1208. If a stop command has been issued (YES), the apparatus is stopped to stop steam heating (step S1214), and a heat pump 10 stop command has been issued. If so (YES in step S1215), the heat pump 10 is stopped and the operation is terminated (step S1216). If no stop command for the heat pump 10 is issued (NO in step S1215), the heat pump 10 is set in the cooling mode (NO in step S1217). , Step S1218) The operation is terminated. Even if YES in step S1210 and the workpiece loading is stopped, if there is a workpiece remaining in the electrodeposition tank 6, the operation is continued until the workpiece is electrodeposited. Further, regarding step S1215, when the liquid temperature rises due to the heat generated by the electrodeposition liquid agitation pump (not shown), the heat pump 10 is not stopped.

  Further, when the heat pump 10 is not in the cooling mode (step S1217), the pretreatment tank is heated with the hot water of the heat pump 10, and the production line (pretreatment electrodeposition coating process) is stopped (workpiece continuous carry-in stop) or is started. It is possible to keep the temperature of the pretreatment liquid and prevent the temperature from falling due to (when the production line is started up and when the continuous loading of workpieces is started). In addition, in the case where factory exhaust heat exists, by further warming the cold water of the heat pump 10 with the factory exhaust heat, it is possible to keep the pretreatment liquid warm or prevent temperature drop even in winter, The start-up time at the time of re-operation such as the end of holidays (continuous holidays) can be shortened, and the energy consumption of other heat sources can be reduced when the pretreatment liquid is heated by other heat sources at the time of equipment startup. . In addition, when the amount of factory exhaust heat exists when the production line is set up, the cold water is heated by the factory exhaust heat for a predetermined time using a timer, thereby increasing the chilled water load of the heat pump 10 and thereby supplying hot water. Can be increased, and the pretreatment process can be started up efficiently.

  When the heat pump 10 is operated to follow the hot water, when a state in which no work is carried into the pretreatment tank occurs, the heating load is reduced and the output of the heat pump 10 is reduced, while the work from the pretreatment process remains in the electrodeposition tank 6. If it is energized, cooling is still necessary. Therefore, if the heat pump 10 continues to be operated as it is, the amount of cold supply decreases and cooling becomes insufficient. In steps S1210 and S1211, in order to detect a state in which no work is carried into the pretreatment tank and switch the heat pump to the cold water tracking mode, It becomes possible to avoid insufficient cooling. In addition, if the heat generated at the time of the cold water follow-up operation is left due to a decrease in the heating load in the pretreatment tank, the heat is radiated by a cooling tower or the like, and the operation of the heat pump 10 is continued. Further, instead of switching to the cold water tracking mode, switching to the cooling mode may be performed.

  According to the electrodeposition coating apparatus of the seventeenth embodiment, it starts in the cold water follow-up mode and switches to the hot water follow-up mode when a cooling load is generated, thus appropriately dealing with the load and exhaust heat state at the start-up of the production line However, it is possible to provide heating and cooling by the hot water following operation of the heat pump 10 that is extremely energy saving.

  In addition, according to the electrodeposition coating apparatus of the seventeenth embodiment, the load state when the work loading is stopped in the pretreatment process (reduction of heating load, etc.) is switched to the cold water tracking mode when the work carrying into the pretreatment tank is stopped. It is also possible to respond appropriately.

[18th form]
The electrodeposition coating apparatus 3251 according to the eighteenth embodiment shown in FIG. 20 (a) is the same as the first embodiment, but includes a hot water tank 3058 and a cold water tank 3104, and steam as another heat source in the hot water tank 3058. Z (may be an electric heater) is introduced, and an air cooling heat pump 2154 (cooling tower, exhaust heat, heating air cooling heat pump or the like may be used) is further connected to the cold water tank 3104. The electrodeposition coating apparatus operates in the same manner as in the first embodiment, and also operates as shown in FIG. 20B, for example.

  That is, the heat pump 10 is operated to supply cold water at the cold water supply temperature set value (12 degrees) in the cold water follow-up mode, and is operated with priority over the air-cooled heat pump 2154. The heat pump 10 is operated so as to supply hot water at the hot water supply temperature set value (60 degrees) in the hot water follow-up mode, and is operated with priority over the introduction of the steam Z. On the other hand, the air-cooled heat pump 2154 supplies cold water having a first specified temperature (15 degrees, a value higher than the heat pump 10 cold water supply temperature set value) to the cold water tank 3104, and the steam Z is supplied from the hot water tank 3058 to the second specified temperature (50 degrees, The heat pump 10 is supplied when the temperature is lower than the warm water supply temperature set value). Hot water returns to the heat pump 10 at 55 degrees, for example, and cold water returns to the heat pump 10 and the air-cooled heat pump 2154 at 17 degrees, for example.

  Then, the automatic control device first activates the heat pump 10 in the hot water follow-up mode (step S1301), and only when the monitored cold water supply temperature is lower than a predetermined temperature (7 degrees) (YES in step S1302). Is changed to the cold water follow-up mode (step S1303). Further, the automatic control device changes from the cold water tracking mode to the hot water tracking mode for the heat pump 10 only when the monitored hot water supply temperature exceeds the specific temperature (62 degrees) (YES in step S1304) (step S1305). The automatic control device repeats the processing from step S1302 unless there is a stop command for the auto pump 10 by pressing the stop button or the like (NO in step S1306), and if there is a stop command (YES in step S1306), the heat pump 10 is turned on. Stop (step S1307).

  In step S1302, the mode may be switched when the state where the cold water supply temperature is lower than the predetermined temperature continues for a predetermined time (ascertained by a timer connected to the automatic control device). Further, step S1304 can be similarly changed.

  In such an electrodeposition coating apparatus 3251 according to the eighteenth embodiment, supply cold heat becomes excessive with respect to the cooling load due to switching of the operation mode of the heat pump 10 or other heat source (steam Z) / other cold heat source (air-cooled heat pump 2154). When the cooling water follow-up mode is appropriate, the cooling load is appropriately handled, and the heating load is supported by hot water and other heat sources, and when the supply heat is excessive with respect to the heating load, the hot water follow-up mode is appropriately handled. Correspond to the cooling load with cold water and other cold heat sources. Therefore, it is possible to continue the operation of the heat pump 10 with a very good energy saving performance.

[19th form]
The electrodeposition coating apparatus 3301 according to the nineteenth embodiment shown in FIG. 21 is the same as the first embodiment except for the circuit according to the heat exchanger 30. In the electrodeposition coating apparatus 3301, the pipe 32 to the heat exchanger 30 serves as a supply pipe for a cooling tower 3302 as a cooler, and the pipe 34 from the heat exchanger 30 requires cooling that requires cooling of a compressor belonging to the factory. It is a pipe to the equipment 3304 requiring cooling as equipment. A pipe 3306 for guiding the medium from the former to the latter is passed between the cooling required apparatus 3304 and the cooling tower 3302, and the medium flow rate adjusting valve 3308 as medium heat amount adjusting means (equipment cooling water temperature adjusting means) is passed to the pipe 3306. And the branch side of the medium flow rate adjustment valve 3308 is connected to the pipe 32. A plurality of cooling towers 3302 may be installed, or a refrigerator or an air cooling heat pump may be installed instead of or together with the cooling tower 3302. Further, the cooling required equipment 3304 may be replaced with air conditioning equipment that is cooling equipment or equipment that requires temperature adjustment (such as a molding machine or a stock solution such as urethane).

  This electrodeposition coating apparatus 3301 operates in the same manner as in the first embodiment, for example, as shown below.

  That is, when the temperature of the chilled water is relatively low (the amount of chilled water is large), the heat pump 10 follows the warm water, supplies 7 degrees of chilled water to the electrodeposition tank 6, and 10 degrees of chilled water from the electrodeposition tank 6 Is issued. A coolant having a predetermined temperature (15 degrees) is supplied from the cooling tower 3302 to the heat exchanger 30, and the cold water temperature is raised to 12 degrees by heat exchange. The temperature of the medium after the heat exchange is lowered to 13 degrees, introduced as cooling water into the cooling required equipment 3304, heated to 31 degrees by heat exchange during cooling, and introduced into the cooling tower 3302 as appropriate. The coolant (medium) is adjusted by the medium flow rate adjustment valve 3308 so as to reach a predetermined temperature in the pipe 32.

  On the other hand, when the temperature of the cold water is relatively high (the amount of cold water in the cold water is small), the heat pump 10 follows the warm water, supplies 18 degrees of cold water to the electrodeposition tank 6, and the cold water of 21 degrees from the electrodeposition tank 6 Is issued. A coolant having a predetermined temperature is supplied from the cooling tower 3302 to the heat exchanger 30, and the cold water temperature is lowered to 19 degrees by heat exchange. The temperature of the medium after the heat exchange rises to 17 degrees, is introduced as cooling water into the required cooling equipment 3304, is heated to 25 degrees by heat exchange during cooling, and is appropriately introduced into the cooling tower 3302. The coolant (medium) is adjusted by the medium flow rate adjustment valve 3308 so as to reach a predetermined temperature in the pipe 32.

  In the electrodeposition coating apparatus 3301, heat is exchanged between the cooling side of the heat pump 10 and the cooling water (medium) before cooling of the cooling equipment 3304 belonging to the factory, and the cooling water before cooling is used as a medium flow rate adjustment valve 3308 (or cooling tower 3302). ), The cold water is heated by heat exchange when the cold water is colder than the medium at the predetermined temperature, and the cold water is cooled by heat exchange when the cold water is warmer than the medium at the predetermined temperature. In any case, the chilled water can be brought close to a predetermined temperature, there is no need to monitor the chilled water return temperature of the heat pump 10, and there is no need to provide a control valve on the chilled water side of the heat pump 10. It is possible to effectively prevent the cooling heat shortage and the supercooling effectively by the configuration or operation, and to naturally stabilize the cold water temperature of the heat pump 10.

  Note that the nineteenth embodiment may be modified as follows. That is, only the air cooling heat pump is connected to the heat exchanger 30 so that the cooling side heating medium is supplied from the air cooling heat pump. The air-cooled heat pump is operated so as to maintain the cooling side heating medium at a predetermined temperature (20 degrees) (a heating operation is performed if the temperature is lower than the predetermined temperature, and a cooling operation is performed if the temperature is equal to or higher than the predetermined temperature). Therefore, the cold water of the heat pump 10 is brought close to a predetermined temperature by heat exchange with the cooling side heating medium, that is, the cold water is heated by the cooling side heating medium (cooling side medium) if the temperature falls below the predetermined temperature, and the cooling side if it exceeds the predetermined temperature. It is cooled by the heating medium (cooling side medium), and it is possible to continue the operation of the heat pump, which is energy-saving, without performing complicated control only by the automatic operation that keeps the medium of the air-cooled heat pump at a predetermined temperature. In combination with the fourteenth embodiment, more stable temperature control can be performed.

[20th form]
The electrodeposition coating apparatus 3351 according to the twentieth embodiment shown in FIG. 22 is the same as the first embodiment except for the circuit according to the heat exchanger 30. In the electrodeposition coating apparatus 3351, the pipe 32 to the heat exchanger 30 extends from the washing tank 3356 and includes a pump 3352, and the pipe 34 to the heat exchanger 30 reaches the washing tank 3356. The cooling side of the heat pump 10 is heated via the heat exchanger 30 by a medium that collects exhaust heat from the washing tank 3356 and distributes it through the pipes 32 and 34. Even in this electrodeposition coating apparatus 3351, as in the first embodiment, it is possible to continue the operation of the heat pump 10 with extremely high energy saving performance. Note that the heat exchanger 30 may be attached after the shower pump in the washing tank 3356. Further, not only in the hot water follow-up mode but also in the cold water follow-up mode, the exhaust heat of the cleaning tank 3356 can be effectively used for the warming of the pretreatment.

Furthermore, the twentieth embodiment can be changed as follows. That is, a heat exchanger is provided in one of the pipes 12 and 22, and a cooling tower is connected to the heat exchanger, and a circuit for radiating warm water on the pretreatment side is installed. Then, when the heat pump 10 is operated in the cold water follow-up mode, and the hot water generated at the same time has insufficient heat and steam Z (other heat source) is introduced (in winter, etc.), heat exchange with the cold water by the heat exchanger 30 is performed. By increasing the amount, the cooling load is increased, and accordingly, the heating supply amount is also increased, so that the amount of steam Z used to cope with the heating load is reduced and the energy used is saved. In addition, a cold water tank can be interposed. Furthermore, the heat exchange with the cold water in the heat exchanger 30 may be performed by the heat belonging to the factory instead of by the exhaust heat of the washing tank 3356 or together with the exhaust heat. Further, the pump connected to the pipe 32 is provided on the condition that the heating by the heat pump 10 is excessive and the heat radiation from the cooling tower is radiated or the temperature of the hot water exceeds a set value (for example, 65 degrees). 3352 is stopped or the flow rate is adjusted by inverter control (cooling side heating medium heat amount adjusting means using the flow rate adjusting means) to adjust the amount of heat of the cooling side heating medium or the amount of heat exchange with the cold water. Adjust the cooling load. In addition, when the return temperature of the cold water (pipe 26) or the going-out temperature (pipe 16) rises and exceeds a set value (for example, 22 degrees), the pump 3352 is stopped or the flow rate is adjusted by inverter control. Good. Further, the adjustment of the heat exchange amount with the factory exhaust heat may be performed by a flow rate adjusting valve instead of or together with the inverter-controlled pump.

[21st form]
The electrodeposition coating apparatus 3401 according to the 21st form shown in FIG. 23 is the same as the 18th form, but is further connected to the cold water tank 3104 via a factory waste heat source and a heat exchanger to exchange factory waste heat XX. 3402 and 3404 are connected, a pump 3406 is interposed in a pipe 3402 to a factory waste heat source, a cooling tower 3302 (other cooling heat source) is installed instead of an air cooling heat pump, and a cooling tower 3302 and a cold water tank 3104 are further provided. Between the pipe 34, a pump 3408 and a flow rate adjusting valve 3410 as a cooling heat amount adjusting means are interposed.

  For example, the electrodeposition coating apparatus 3401 operates as follows. That is, the heat pump 10 is operated in the chilled water follow-up mode, and by creating a condition for supplying 350 kW of (excessive) chilled water exceeding the cooling load 200 kW, hot water 500 kW is supplied from the heat pump 10 and corresponds to the heating load 600 kW. . The heating load of 100 kW that cannot be covered with hot water is adjusted by supplying steam Z (100 kW) as another heat source.

  In order to supply 350 kW of chilled water by the automatic control device, the pump 3406 is operated at a maximum flow rate, and maximum heat exchange is performed with the factory exhaust heat XX (chilled water heating 300 kW, chilled water heating from 17 degrees to 20 degrees) . If it remains as it is, the heat of 150 kW is excessive due to the correspondence with the cooling load of the electrodeposition tank 6 and the heat exchange with the factory exhaust heat XX, and the chilled water temperature continues to rise, so the chilled water is cooled by the cooling tower 3302 ( 150 kW cooling, temperature drop from 17 degrees to 15 degrees cold water). The automatic control device controls the cooling tower 3302, the pump 3408, and the flow rate adjustment valve 3410 so that the temperature of the chilled water in the chilled water tank 3104 becomes a predetermined temperature (17 degrees) (so that the amount of chilled water becomes a predetermined amount). To do. Note that the amount of heat of the medium related to the factory exhaust heat XX (the amount of heat exchange with the factory exhaust heat XX) may be adjusted by inverter control of the pump 3406 or a flow rate adjustment valve installed instead.

  And an automatic control apparatus respond | corresponds as follows to the factory waste heat XX from which calorie | heat amount fluctuates. That is, if the factory waste heat XX increases, the cooling amount in the cooling tower 3302 increases accordingly. On the other hand, if the factory exhaust heat XX decreases, the cooling amount in the cooling tower 3302 is reduced accordingly. In addition, it can respond to the cooling load of the electrodeposition tank 6 similarly.

  The electrodeposition coating apparatus 3401 includes a heat exchanger that heats the cold water by introducing the cold water of the heat pump 10 and the factory exhaust heat XX and exchanging heat, and the heat pump 10 has a cold heat amount that exceeds the cooling load amount of the electrodeposition liquid. The cooling medium following operation is performed in a state where a certain cooling medium is supplied. The excess amount of cooling heat is applied to the factory exhaust heat XX, and when the factory exhaust heat XX is large and the cooling by the cold water is insufficient, it is adjusted by the cooling tower 3302 that is another cooling heat source that assists the cooling by the cooling medium. In addition, the fluctuation | variation etc. of a heating load respond | correspond with the vapor | steam Z as another heat source.

  Therefore, heating or cooling by the heat pump 10 is continuously provided in a simple configuration with low initial costs (expenses for connecting the existing heating and cooling devices with the heat pump 10 and providing a circuit for the factory exhaust heat XX) and running costs. In addition, the heat recovery of the factory exhaust heat XX can be performed simply to provide an electrodeposition coating apparatus 3401 excellent in energy saving.

[Other forms]
In the above embodiment, various types of heat (factory exhaust heat, etc.) 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. Or in conjunction with this, heat from other types of factories can be used, such as: In other words, other exhaust and exhaust heat generated in the factory, heat from various equipment, heat from hydraulic oil, heat from the work after painting and drying, and products heated by hot water washing are washed in the subsequent process. The heat transferred to the washing water in the case of washing with water, waste heat generated from factory air conditioning (cool water return), waste heat including cogeneration cooling water, or a combination thereof is used. Further, instead of or together with the various heats, the heat of hot water generated by a separate heat pump (cooling side heating medium supply heat pump) may be used. In this case, the energy used for the operation of the cooling-side heating medium supply heat pump increases, but the increase is less than the energy required when the heat from the heating / cooling heat pump is discarded. It is possible to make a good electrodeposition coating apparatus. Furthermore, the hot water of the cooling side heating medium supply heat pump and the exhaust heat of the factory and the cold water of the heat pump for heating and cooling are introduced into the heat exchanger, and the hot water and the exhaust heat are combined and applied to the cold water of the heat pump for heating and cooling. good. Still further, as the cooling-side heating medium, steam of the boiler or the like, or a combination of this with exhaust hot water or hot water of the cooling-side heating medium supply heat pump can be used. In addition, various controls and switching by the automatic control device can be performed manually. In addition, regarding the adjustment of the heating amount of the cold water (heating amount adjusting means), instead of the adjustment of the branch amount to the heat exchanger, the adjustment of the amount of exhaust gas hitting the cooling medium heating heat exchanger, these A combination 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.

  Further, a separate heat pump (heating heat pump) may be provided which directly takes in and heats the refrigerant of the heat pump that heats the pretreatment tank and cools the electrodeposition tank and returns it to the heat pump. In addition to this, the above-described various heat exchangers for heating the refrigerant of the heat pump can also be installed. Also, on the cold water side of the heat pump that heats the pretreatment tank and cools the electrodeposition tank, the cold water from the heat pump is treated at the factory in the same manner as the exhaust hot water, and the exhaust hot water higher than the cold water (after being appropriately treated) ) It is possible to directly return to the heat pump or to arrange the pipe of the waste water so that the waste water enters the heat pump so that the flow path can be switched.

  In addition, the same effect as described above can be obtained by using an air-cooled heat recovery type heat pump (air-cooled heat pump type / cold / warm water simultaneous extraction type) instead of (or with) the exhaust heat recovery type heat pump. . In other words, the air-cooled heat recovery heat pump automatically balances the air (air) as the heat source when the heat balance between cold water and hot water is lost (heat is removed from the atmosphere when the heat is insufficient, and heat is returned to the air when the cold is insufficient. However, there is a limitation in efficiency because of the heat exchange with the atmosphere. Therefore, if the cooling side of the air-cooled heat recovery type heat pump is heated by factory exhaust heat or the like, the above-described effects such as continuing efficient operation in the air-cooled heat recovery type heat pump can be achieved. In particular, in winter when the outside air temperature is low (5 degrees), when the cooling side is not heated, the efficiency of extracting hot water of 70 degrees using air as a heat source is about COP2.1. The efficiency can be improved to about COP 3.8 by heating up to a degree.

  In addition, arrangement | positioning, control, etc. of said heat pump are the coating-drying apparatus (refer Japanese Patent Application No. 2008-305017 etc. by this applicant), an air-conditioning system (refer the same Japanese Patent Application No. 2009-21768 etc.), a shaping | molding which respectively utilized heat pump. The present invention can also be applied to a temperature control system for a machine (see Japanese Patent Application No. 2009-276713, etc.).

1,81,1151,2861,2871,2881,2901,2911,3001,3051,3101,3201,3221,3251,3301,3351,3401 Electrodeposition coating apparatus 2 Degreasing tank (pretreatment tank)
4 Chemical conversion tank (pretreatment tank)
6 Electrodeposition bath 10,2004 Heat pump (exhaust heat recovery type)
30, 2040, 3130 Heat exchanger (cooling medium heater)
54 Chilled water temperature sensor
2154, 3102 Air-cooled heat pump 3052 Chilled water chiller 2504, 2832, 3302 Cooling tower

Claims (1)

A pre-treatment tank containing a pre-treatment liquid and / or a washing booth after electrodeposition coating using warm water;
An electrodeposition tank containing an electrodeposition solution;
A heat pump that heats the heating medium that heats the pretreatment liquid and / or the hot water, and that cools a cooling medium that cools the electrodeposition liquid;
A heating load amount adjusting means for adjusting a heating load amount of the heating medium to the heat pump;
A cold temperature sensor that detects a cold supply temperature that is a temperature when the cooling medium is supplied from the heat pump and / or a cold return temperature that is a temperature when the cooling medium returns to the heat pump; and
And other heat sources to assist the heating by the heating and / or the heating medium to the heating medium,
The cooling load is connected to the cooling temperature sensor and the other heat source, and controls the heating load amount in the heating load amount adjusting means according to the cooling supply temperature and / or the cooling return temperature obtained from the cooling temperature sensor. An electrodeposition coating apparatus comprising: an automatic control device for adjusting a heating supply amount by a heat source.

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