JP2012149862A - Cooling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve cost reduction by properly using a cooling tower and a chiller.SOLUTION: A cooling system includes a sprinkler 13 to sprinkle cooling water 9 over a transfer region 7 to which an object 3 to be cooled is conveyed by a conveyer 5, a storage tank 19 having an upstream side storage portion 15 and a downstream side storage portion 17, sprinkler pipes 21, 22 to supply sprinklers 11 with the cooling water 9 in the storage tank 19, a cooling tower 23 to cool the cooling water 9 and a chiller 25 that consumes more power than the cooling tower. The cooling system further includes a circulation device 30 having a first circulation line 31 to transfer the cooling water 9 in the upstream side storage portion 15 to the cooling tower 23 and to send it back to the downstream side storage portion 17, a second circulation line 32 to transfer the cooling water 9 in the upstream side storage portion 15 to the cooling tower 23 and to send it back to the upstream side storage portion 15 and a third circulation line 33 to transfer the cooling water 9 in the downstream side storage portion 17 to the chiller 25 and to send it back to the downstream side storage portion 17. A first mode for using the cooling tower 23 alone and a second mode for using both the cooling tower 23 and the chiller 25 are switched to each other.

Description

  The present invention relates to a cooling system that cools an object to be cooled, such as a drinking liquor pack or an edible retort pack, to a predetermined temperature with cooling water.

  In the liquor pack and the like, after being sterilized by heating to a temperature higher than normal temperature, it is cooled to a predetermined temperature by cooling water. A cooling tower, a chiller, etc. are used for temperature adjustment in the case of circulating and using the cooling water (for example, refer to patent documents 1).

JP 2009-192088 A

  By the way, in the case of the technique disclosed in Patent Document 1, the object to be cooled is cooled with the cooling water cooled by the chiller, and the cooling water whose temperature is increased by this cooling is sent to the cooling tower to be cooled, and the cooling water is cooled to the chiller. A cooling water supply / discharge path is configured so as to return to the position.

  Therefore, all the cooling water passes through a chiller whose power consumption is larger than that of the cooling tower, and it is difficult to reduce the cost.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a cooling system capable of reducing the cost by properly using a cooling tower and a chiller.

  The cooling system of the present invention is a cooling system for cooling an object to be cooled with cooling water, and includes a conveying means for conveying the object to be cooled, and an entire conveyance area where the object to be cooled is sent by the conveying means. Or a plurality of sprinklers for applying cooling water to at least a part of the area, watering means disposed along the conveying direction, and provided below the conveying area, receiving and storing the cooling water, A storage tank having an upstream storage portion and a downstream storage portion, and supplying cooling water from the upstream storage portion to the upstream side in the transport direction of the sprinkler, and the downstream storage portion Watering pipe for supplying the cooling water to the downstream side in the transport direction of the watering device, a cooling tower for cooling the cooling water, and cooling water for cooling water, which consumes more power than the cooling tower. A large chiller and a first circulation path that sends cooling water from the upstream storage section to the cooling tower and returns to the downstream storage section, and sends cooling water from the upstream storage section to the cooling tower to the upstream side. A second circulation path that returns to the storage section, a circulation facility having a third circulation path that sends cooling water from the downstream storage section to the chiller and returns to the downstream storage section, and the first circulation path The first mode in which the cooling tower is used and the chiller is not used, and the second mode in which the cooling tower and the chiller are used together by selectively switching between using the second circulation path and the third circulation path. And a control means for switching the cooling mode. In the case of the present invention, the cooling water stored in the upstream storage section is supplied to the water sprinkler on the upstream side in the transport direction of the sprinkling means and sprinkled on the cooling object transported in the transport area. On the other hand, the cooling water stored in the storage section on the downstream side is supplied to the sprinkler on the downstream side in the transport direction of the sprinkling means and sprinkled on the cooling object transported through the transport area. The sprinkled cooling water is stored in the storage tank after removing heat from the object to be cooled. In such a cooling system, when the cooling water temperature can be lowered only by the cooling tower, the first circulation path passing through the cooling tower is used in the first mode, and the cooling water temperature can be lowered only by the cooling tower. When it becomes impossible, it is necessary to operate the chiller in addition to the cooling tower to lower the temperature of the cooling water. In this case, the second mode uses the second circulation path through the cooling tower and the third circulation path through the chiller. In this way, it is controlled by the control means. Therefore, since the chiller is not used according to the degree of cooling the cooling water, the cost can be reduced.

  In the cooling system having this configuration, the object to be cooled is heat-treated at a constant temperature, and the control means is configured to perform the first operation based on the cooling target temperature of the object to be cooled and the water temperature of the cooling water in the upstream reservoir. Switching between the first mode and the second mode may be controlled. In this configuration, when the cooling target temperature of the object to be cooled is high and the temperature of the cooling water in the upstream storage section is low, the cooling capacity of the downstream storage section by the cooling water is not so much, so only the cooling tower On the other hand, when the cooling target temperature of the object to be cooled is low and the temperature of the cooling water in the upstream reservoir is high, the cooling capacity of the downstream reservoir is required by the cooling water. Therefore, the second mode using the chiller in addition to the cooling tower is adopted. The conditions for switching between the modes are obtained in advance based on empirical rules corresponding to specific temperature conditions.

  In the cooling system having this configuration, the first circulation path has a first forward path in which both ends are connected to the upstream storage section and the cooling tower, and both ends are connected to the cooling tower and the downstream storage section. A first switching valve provided in one return path and the first return path, the second circulation path having both ends in the first forward path, the upstream storage section and the cooling tower or in the middle of the first return path. A second return path connected, and a second switching valve provided in the second return path, wherein the third circulation path is a third forward path in which both ends are connected to the chiller and the downstream storage section, A third return path having both ends connected to the chiller and the downstream storage section; a third switching valve provided in the third forward path; and a fourth switching valve provided in the third return path, In 1 mode, the first switch And the first switching path is used by closing the second switching valve, the third switching valve, and the fourth switching valve. In the second mode, the first switching valve is closed. And by opening the said 2nd switching valve, the said 3rd switching valve, and the said 4th switching valve, a 2nd circuit and a 3rd circuit can be used.

  In the cooling system of this configuration, the cooling tower includes a pipe through which the cooling water from the upstream storage section passes, a fan that rotates to blow air to the pipe, and a pipe sprinkler that sprinkles the cooling water into the pipe. The amount of cooling water sent through the pipe may be adjusted by combining the presence or absence of watering by the pipe watering device and the presence or absence of rotation of the fan. In the case of this configuration, the cooling amount of the cooling water can be adjusted more finely.

  In the cooling system having this configuration, the chiller is configured to have a compressor, a condenser, an evaporator, an expansion valve, and a conduit through which the refrigerant circulates.

  In the cooling system having this configuration, the object to be cooled may be a sake pack in which sake sterilized by heating at the constant temperature is contained in a container.

  In the case of the present invention, the cooling water stored in the upstream storage section is supplied to the water sprinkler on the upstream side in the transport direction of the sprinkling means and sprinkled on the cooling object transported in the transport area. On the other hand, the cooling water stored in the storage section on the downstream side is supplied to the sprinkler on the downstream side in the transport direction of the sprinkling means and sprinkled on the cooling object transported through the transport area. The sprinkled cooling water is stored in the storage tank after removing heat from the object to be cooled. In such a cooling system, when the cooling water temperature can be lowered only by the cooling tower, the first circulation path passing through the cooling tower is used in the first mode, and the cooling water temperature can be lowered only by the cooling tower. When it becomes impossible, it is necessary to operate the chiller in addition to the cooling tower to lower the temperature of the cooling water. In this case, the second mode uses the second circulation path through the cooling tower and the third circulation path through the chiller. In this way, it is controlled by the control means. Therefore, since the chiller is not used according to the degree of cooling the cooling water, the cost can be reduced.

It is a mimetic diagram showing a cooling system concerning one embodiment of the present invention. It is a flowchart which shows the operation | movement content of the cooling system of FIG.

  Embodiments of the present invention will be specifically described below.

  FIG. 1 is a schematic diagram showing a cooling system according to an embodiment of the present invention.

  The cooling system 1 is for cooling the cooling object 3 with cooling water, and a belt conveyor 5 as a conveying means for conveying the cooling object 3 in a horizontal conveying direction A with the cooling object 3 placed thereon; Sprinkling means in which a plurality of (eight in the illustrated example) water sprinklers 11 are arranged at predetermined intervals along the transport direction A so that the cooling water 9 is poured over the entire transport area 7 to which the object 3 to be cooled is sent by the belt conveyor 5. 13, a storage tank 19 that is provided below the transport area 7 and receives and stores the cooling water 9, and has a storage section 15 on the upstream side in the transport direction A and a storage section 17 on the downstream side, and an upstream side. Water supply pipe 21 for supplying the cooling water 9 of the storage section 15 to a plurality (three in the illustrated example) of the water sprinklers 11 (11a, 11b, 11c) on the upstream side in the conveying direction A, and the downstream storage section 17. A plurality of cooling waters 9 in the conveyance direction A downstream (in the illustrated example, Water sprinkler 11 (11d, 11e, 11f), a cooling tower 23 for cooling the cooling water 9, and a cooling tower 9 for cooling the cooling water 9. The chiller 25 with a large consumption amount, the first circulation path 31 for sending the cooling water 9 of the upstream storage unit 15 to the cooling tower 23 and returning it to the downstream storage unit 17, and the cooling water 9 of the upstream storage unit 15 as the cooling tower And a third circulation path 33 that sends the cooling water 9 of the downstream storage section 17 to the chiller 25 and returns it to the downstream storage section 17. A control device 35 as a control means for performing switching control or the like alternatively using the circulation facility 30 and the first circulation path 31 or using the second circulation path 32 and the third circulation path 33. Equipped with a. In addition, well water is supplied as cooling water to the two sprinklers 11g and 11h on the downstream side in the transport direction A.

  As the cooling object 3, for example, in this example, a sake pack in which sake sterilized at a constant temperature (for example, about 68 ° C.) is contained in a container corresponds. This heat-sterilized sake pack (object to be cooled) 3 is carried into the inlet 5a of the belt conveyor 5 by unillustrated loading means, and unloaded from the outlet 5b by unillustrated unloading means.

  The belt conveyor 5 conveys the cooling object 3 in the conveyance direction A, and has a function of dropping the cooling water 9 sprinkled from the water sprinkler 11 downward, for example, a belt provided with a through hole or a mesh-shaped belt. A belt or the like is used. The temperature of the cooling object 3 at the inlet 5a of the belt conveyor 5 (B in Table 1 described later) is, for example, about 65 ° C., and the cooling target temperature of the cooling object 3 at the outlet 5b {in Table 1 described later] C (<B)} is about 45 ° C., for example. The temperature of about 65 ° C. is a case where the object 3 to be cooled is a liquor pack, and when the object 3 to be cooled is another object, the temperature may be different depending on the purpose of the treatment. The reason why the cooling target temperature (C) of the cooling object 3 is about 45 ° C. is to prevent the contents of the cooling object 3 from being deteriorated by being exposed to a high temperature for a long time. In addition, the conveyance direction A of the belt conveyor 5 is not limited to the horizontal direction, and may be an angle close thereto.

  The storage unit 15 on the upstream side in the transport direction A receives and stores the cooling water 9 from the four sprinklers 11a to 11d on the upstream side in the transport direction A, and the storage unit 17 on the downstream side has four on the downstream side in the transport direction A. The cooling water 9 from the two water sprinklers 11e-11h is received and stored. However, the cooling water 9 from the sprinkler 11d located at the most downstream position among the four sprinklers 11a to 11d on the upstream side in the transport direction A is received by the storage section 17 on the downstream side, and the four on the downstream side in the transport direction A. The cooling water 9 from the sprinkler 11e at the most upstream position among the sprinklers 11e to 11h may be received by the upstream storage section 15.

  The cooling water 9 stored in the upstream storage unit 15 is supplied to the three sprinklers 11 a to 11 c on the upstream side in the transport direction A via the pipe 21 and the pump 21 a provided in the pipe 21. The cooling water 9 stored in the storage section 17 on the downstream side is supplied to the three sprinklers 11d, 11e, and 11f on the downstream side in the transport direction A through the pipe 22 and the pump 22a provided on the pipe 22.

  The cooling tower 23 includes a pipe 23a through which the cooling water 9 from the upstream storage section 15 passes, a fan 23b that rotates to blow air from the outside of the pipe 23a, and a pipe sprinkler that sprays the cooling water 24 to the pipe 23a. 23c, and the cooling amount of the cooling water 9 fed through the pipe 23a is adjusted by combining the presence / absence of water spraying by the pipe sprinkler 23c and the presence / absence of rotation of the fan 23b. The presence or absence of water sprinkling by the pipe sprinkler 23c and the presence or absence of rotation of the fan 23b are controlled by the control device 35. The presence or absence of watering by the pipe watering device 23c is substantially performed by turning on and off the watering pump 23d that sucks up water accumulated at the bottom of the tower.

  Although not shown, the chiller 25 has a compressor, a condenser, an evaporator, an expansion valve, and a conduit through which a refrigerant (for example, a CFC substitute) circulates, and the cooling capacity of the cooling tower 23 is insufficient. Used when The cooling capacity of the chiller 25 may be larger or smaller than the maximum cooling capacity of the cooling tower 23 (cooling capacity when the fan 23b rotates and the pipe sprinkler 23c sprinkles). For example, the cooling tower 23 When the maximum cooling capacity is 400 kW, a chiller such as 425 kW, 355 kW, 300 kW, 236 kW, 180 kW, 150 kW, 118 kW, 90 kW, 60 kW, 30 kW, 20 kW, 10 kW, 5 kW, or 1 kW can be used. . Here, the reason for using the chiller 25 is as follows. That is, the cooling tower 23 is easily affected by the atmospheric temperature and humidity, and is difficult to cool to a temperature that is significantly lower than the atmospheric temperature. However, since the chiller 25 is a system that cools the cooling water with electric power, This is because it is possible to cool to a temperature that is much lower than the atmospheric temperature that is difficult to cool with No. 23.

  The first circulation path 31 has both ends connected to a first forward path 31a having both ends connected to the upstream storage section 15 and one end of the pipe 23a of the cooling tower 23, and the other end of the pipe 23a and the downstream storage section 17. Are connected to each other, and a first switching valve 32d provided in the first return path 31b. The second circulation path 32 shares the first forward path 31a, and has both ends connected to the upstream side of the first switching valve 32d and the upstream storage section 15 in the middle of the first return path 31b. It has the 2nd switching valve 32c provided in the 2nd return path 32b and the 2nd return path 32b. Further, the second circulation path 32 shares a part of the first return path 31 b of the first circulation path 31. The third circulation path 33 includes a third forward path 33a and a third return path 33b, both ends of which are connected to the downstream storage section 17 and the chiller 25, a third switching valve 33c provided in the third forward path 33a, and A fourth switching valve 33d is provided in the third return path 33b. The second return path 32b may be connected at both ends to the upstream storage section 15 and the pipe 23a.

  The first circuit 31 is used by opening the first switching valve 32d and closing the second switching valve 32c, the third switching valve 33c, and the fourth switching valve 33d. Conversely, the first switching valve 32d is closed and the second switching valve 32c, the third switching valve 33c, and the fourth switching valve 33d are opened, so that the second circulation valve 31 is replaced with the second switching valve 32d. Both the circuit 32 and the third circuit 33 are used.

  The first forward path 31 a is provided with a pump 31 c, and the pump 31 c supplies the cooling water 9 in the upstream storage section 15 to the pipe 23 a of the cooling tower 23. When the first switching valve 32d is open and the second switching valve 32c is closed, the cooling water 9 supplied to the pipe 23a is returned to the downstream storage section 17 via the first return path 31b, while the first switching valve 32d is closed. When the valve 32d is closed and the second switching valve 32c is open, it is returned to the upstream storage section 15 via the first return path 31b and the second return path 32b. In addition, a pump 32e is provided in the third forward path 33a, and the cooling water 9 in the storage section 17 on the downstream side is supplied to the chiller 25 by the pump 32e.

  The controller 35 controls the opening and closing of the first switching valve 32d and the second switching valve 32c, and the opening and closing of the third switching valve 33c and the fourth switching valve 33d. Specifically, in the first mode in which the cooling tower 23 is used and the chiller 25 is not used, the first switching valve 32d is opened, the second switching valve 32c, the third switching valve 33c, and the fourth switching valve 33d. In the second mode in which both the cooling tower 23 and the chiller 25 are used, the first switching valve 32d is closed, the second switching valve 32c, By opening the third switching valve 33c and the fourth switching valve 33d, control is performed so that both the second circulation path 32 and the third circulation path 33 are used. At this time, in FIG. 1, the flow direction of the cooling water in the first mode is indicated by a solid arrow, and the flow direction of the cooling water in the second mode is indicated by a broken arrow. In the first mode, the chiller 25 is not operated, and in the second mode, the chiller 25 is operated. In the first mode, the cooling water 9 stored in the downstream storage unit 17 is supplied to the upstream storage unit 15 by overflowing the weir 16 that separates the storage units 15 and 17.

  The control device 35 opens and closes the first switching valve 32d and the second switching valve 32c, opens and closes the third switching valve 33c and the fourth switching valve 33d, and turns on and off the pumps 23d, 21a, 22a, 31c, and 32e. Control. The control device 35 performs flow rate control when the pumps 23d, 21a, 22a, 31c, and 32e are on, and on / off control of the cooling tower 23 and the chiller 25. The pumps 23d, 21a, 22a, 31c, 32e and the chiller 25 are each capable of inverter control, and can adjust the power consumption.

  As shown in Table 1, the control device 35 includes a processing temperature (B) of the cooling object 3 that has been sterilized, a cooling target temperature (C) of the cooling object 3, and an upstream storage unit 15. A table for controlling the switching of the cooling mode between the first mode and the second mode based on the water temperature (D) of the cooling water 9 is provided, and the processing temperature (B) is selected from the input unit (keyboard). When the cooling target temperature (C) is input and the water temperature (D) measured by the thermometer 31d provided in the first forward path 31a is input, the first mode or the second mode is based on the input data and the table. Select alternatively. Further, the water temperature (E) measured by the thermometer 32f provided in the third forward path 33a is also input to the control device 35, and when the control device 35 operates the chiller 25 in the second mode, the water temperature (E) is high or low. Accordingly, control is performed to vary the cooling capacity of the chiller 25, and the water temperature (E) is adjusted to be within a predetermined range.

  In Table 1, for example, 65 ° C. is set as the processing temperature (B) of the cooling object 3, and 45 ° C. or less is set as the cooling target temperature (C). With respect to the water temperature (D), each process temperature (B) is divided into a temperature of 35 ° C. or higher and a temperature lower than 35 ° C., and the mode to be selected is that the water temperature (D) is lower than 35 ° C. The first mode is selected when the temperature is lower, and the second mode is selected when the water temperature (D) is 35 ° C. or higher. Further, as described above, in the second mode, it is set to execute control for varying the cooling capacity of the chiller 25 in accordance with the input water temperature (E). In addition, the apparatus power consumption in Table 1 is a value in the case of using the cooling tower 23 having a maximum cooling capacity of 400 kW and the chiller 25 having a cooling capacity of 118 kW.

  Next, the operation content of the cooling system 1 configured as described above will be described based on the flowchart shown in FIG. Here, description will be made on the assumption that the processing temperature (B) input from the input unit (keyboard) is 65 ° C. and the cooling target temperature (C) is 45 ° C. or less. In addition, about cooling target temperature (C), it is set by the input in an input part.

  First, the operation switch is turned on (step S1). Along with this, the control device 35 starts operation, and the commands from the control device 35 cause the pumps 21a, 22a, 31c and 32e to be in an operation standby state, and the first switching valve 32d, the second switching valve 32c, The 3 switching valve 33c and the 4th switching valve 33d will be in an operation standby state.

  Subsequently, the control device 35 turns on both the pump 31c and the pump 32e, and closes all of the first switching valve 32d, the second switching valve 32c, the third switching valve 33c, and the fourth switching valve 33d (S2). ).

  Next, when the processing temperature (B) is 65 ° C. and the cooling target temperature (C) is 45 ° C. or less, the control device 35 determines whether the water temperature (D) is lower than the first temperature D1, for example, 35 ° C. It is determined whether or not (S3).

  In this determination, when the water temperature (D) is lower than the first temperature D1 (35 ° C.), the process proceeds to S4, where the control device 35 opens the first switching valve 32d and opens the second switching valve 32c. The third switching valve 33c and the fourth switching valve 33d are both closed. Subsequently, the control device 35 deactivates the chiller 25, activates the cooling tower 23, and executes the first mode (S5). That is, the first circulation path 31 is used, and the cooling water 9 flowing through the first circulation path 31 is cooled by the cooling tower 23.

  Next, it is determined whether or not the operation switch is off (S6), and the above processing is repeated until the operation switch is turned off. On the other hand, when the water temperature (D) is equal to or higher than the first temperature D1 (35 ° C.) in S3, the process proceeds to S7 where the first switching valve 32d is opened to closed, and the second switching valve 32c, third Both the switching valve 33c and the fourth switching valve 33d are opened from closed. Subsequently, the cooling tower 23 is operated and the chiller 25 is operated (S8). That is, the second circulation path 32 is used to cool the cooling water 9 flowing through the second circulation path 32 by the cooling tower 23, and the third circulation path 33 is used to cool the cooling water 9 flowing through the third circulation path 33 to the chiller. Cool at 25. When the chiller 25 is cooling, control for changing the cooling capacity of the chiller 25 according to the water temperature (E) from the thermometer 32f is executed.

  Thereafter, in S6, when the operation switch is turned off, the control device 35 deactivates the cooling tower 23 and the chiller 25, turns off both the pump 31c and the pump 32e, and the first switching valve 32d, The second switching valve 32c, the third switching valve 33c, and the fourth switching valve 33d are all closed (S9), and the above cooling process is terminated.

  Therefore, in the case of the cooling system 1 according to the present embodiment, when the water temperature of the cooling water 9 is low and the water temperature of the cooling water 9 can be lowered only by the cooling tower 23, both pass through the cooling tower 23 in the first mode. On the other hand, when the first circulation path 31 is used and it becomes impossible to lower the temperature of the cooling water 9 only by the cooling tower 23, the second mode in which the chiller 25 is operated in addition to the cooling tower 23 passes through the cooling tower 23. Two circulation paths 32 and a third circulation path 33 passing through the chiller 25 are used. Therefore, the chiller 25 is not used according to the degree to which the cooling water 9 is cooled, so that the cost can be reduced. For example, the water temperature (D) is equal to or higher than the first temperature D1 (35 ° C.), that is, the device power consumption is 47.1 kW in the second mode using the chiller 25, whereas the water temperature (D) is the first temperature. The device power consumption can be reduced to 20.6 kW, which is less than half, in the first mode lower than D1, that is, when the chiller 25 is not used.

  In the present embodiment, the cooling water stored in the downstream storage unit 17 overflows into the upstream storage unit 15, but the temperature of the cooling water stored in the downstream storage unit 17 Is lower than the temperature of the cooling water stored in the upstream storage section 15, there is no problem with cooling the cooling object 3.

  Table 2 is a table showing the contents of a table for executing another embodiment of the present invention.

  In Table 2, when the first mode is selected, the water temperature (D) is lower than the second temperature D2 (<D1), for example, 31 ° C., and the third temperature D3 (<D2), for example, 30 ° C. When the water temperature (D) is equal to or lower than the third temperature D3 (30 ° C.) when the fan 23b in the operating cooling tower 23 is stopped at the higher temperature and the first mode is selected, the cooling tower When the water temperature (D) is lower than the third temperature D3 when the watering pump 23d in 23 is stopped and the first mode is selected, the pumps 21a and 22a are set to be proportionally controlled. ing. The contents other than this are the same as in Table 1. The proportional control is a control for increasing / decreasing the feed amount of the cooling water 9 in the pumps 21a and 22a while keeping the ratio of the cooling water 9 sent through the sprinkling pipe 21 and the cooling water 9 sent through the sprinkling pipe 22 constant. Say. In the example of Table 2, this proportional control is performed when the water temperature (D) is lower than the third temperature D3 (30 ° C.) and higher than the fourth temperature D4 (<D3), for example, 27 ° C. For example, the output frequency of the pumps 21a and 22a when the water temperature (D) is the third temperature D3 (30 ° C.) is 60 Hz, and the pumps 21a and 22a when the water temperature (D) is the fourth temperature D4 (27 ° C.). When the output frequency is 35 Hz, the output frequencies of the pumps 21a and 22a are proportional to the water temperature (D) in the range of 60 Hz to 35 Hz.

  By controlling the cooling tower 23 based on this Table 2, the fan 23b is stopped, the proportional control of the pumps 21a and 22a and the watering pump 23d are stopped, so that the cost can be further reduced. For example, by stopping the fan 23b, the device power consumption can be reduced by about 27% to 15.1 kW compared to the non-stop 20.6 kW, and further, the device power consumption can be reduced to 15.1 kW by the stop of the watering pump 23d. Compared with 12.9 kW, it can be reduced by about 15%, and the power consumption of equipment can be reduced by proportional control of the pumps 21a and 22a.

  In Table 2, the temperature condition that separates the stop of the fan 23b and the stop of the watering pump 23d may be set to another temperature. The temperature condition that separates the stop of the watering pump 23d and the proportional control of the pumps 21a and 22a may be different temperatures. Furthermore, in Table 1 and Table 2, it is not necessary to set the processing temperature (B) to 65 ° C., and it may be set to a different temperature value depending on the use conditions, and the cooling target temperature (C). Alternatively, the temperature may be set to another temperature value instead of 45 ° C. or lower, and the first to fourth temperatures (D1 to D4) with respect to the water temperature (D) may be set to other temperature values.

  Although not explicitly stated in the above-described embodiment, the range from the inlet 5a to the outlet 5b of the belt conveyor 5 is configured to be sprinkled by the sprinkling means 13, but the present invention is not limited to this. For example, another belt conveyor may be provided on the inlet 5a side of the belt conveyor 5, or another belt conveyor may be provided on the outlet 5b side of the belt conveyor 5 in addition to or separately from this.

  Furthermore, in the above-described embodiment, the cooling object to be sent to one belt conveyor 5 is cooled by one cooling tower 23 and one chiller 25. However, the present invention is not limited to this, and one cooling tower 23 is used. It is also possible to apply to a configuration in which the object to be cooled respectively sent by two or more belt conveyors 5 is cooled by one chiller 25. However, in this case, selection of the cooling capacity of the cooling tower 23 and the chiller 25 is required.

  Furthermore, in the above-described embodiment, the cooling target temperature (C) is set by the input at the input unit. However, the present invention can be replaced with an outlet 5b of the belt conveyor 5, for example. A contact-type thermometer may be provided, and feedback control may be performed by the control device 35 using an actual measurement value measured by the thermometer.

  Furthermore, in the above-described embodiment, the length of the belt conveyor 5 and its transport speed, the amount of water sprayed by the water spraying means 13, etc. are not clearly stated, but these affect the cooling of the object to be cooled. The cooling target temperature is selected as appropriate.

  Furthermore, in the embodiment described above, a sake pack is exemplified as an object to be cooled. However, the present invention is not limited to this, and the same applies to cooling of edible retort packs and PET bottles containing drinks. Applies to

A Conveying direction 1 Cooling system 3 Cooling object 5 Belt conveyor (conveying means)
DESCRIPTION OF SYMBOLS 7 Conveyance area 9 Cooling water 11 Sprinkler 13 Sprinkling means 15 Upstream storage part 17 Downstream storage part 19 Storage tank 21, 22 Sprinkling pipe 23 Cooling tower 23b Fan 23d Sprinkling pump 25 Chiller 30 Circulation facility 31 1st circulation path 31a 1st forward path 31b 1st return path 32 2nd circulation path 32b 2nd return path 32d 1st switching valve 32c 2nd switching valve 33 3rd circulation path 33a 3rd outbound path 33b 3rd return path 33c 3rd switching valve 33d 4th switching valve 35 Control device

Claims (6)

A cooling system for cooling an object to be cooled with cooling water,
Conveying means for conveying the cooling object;
A plurality of sprinklers that are arranged along the transport direction with a plurality of water sprinklers for applying cooling water to the whole or at least a partial region of the transport area where the object to be cooled is sent by the transport means;
A storage tank that is provided on the lower side of the transport area, receives and stores the cooling water, and has a storage section on the upstream side in the transport direction and a storage section on the downstream side,
Sprinkling piping for supplying the cooling water in the upstream storage section to the upstream side in the transport direction in the sprinkler and supplying the cooling water in the downstream storage section to the downstream side in the transport direction in the sprinkler When,
A cooling tower for cooling the cooling water;
A chiller that cools cooling water and consumes more power than the cooling tower,
A first circulation path that sends cooling water from the upstream storage section to the cooling tower and returns to the downstream storage section, and sends cooling water from the upstream storage section to the cooling tower to the upstream storage section. A circulation facility having a second circulation path to be returned, and a third circulation path for sending the cooling water of the downstream storage section to the chiller and returning it to the downstream storage section;
By selectively switching between using the first circuit or using the second circuit and the third circuit, the first mode using the cooling tower and not using the chiller, and the cooling tower and the chiller And a control means for switching a cooling mode between the second mode used together. The cooling system of claim 1, wherein
The cooling object is heat-treated at a constant temperature, and the control means is configured to perform the first mode and the second mode based on a cooling target temperature of the cooling object and a coolant temperature in the upstream storage unit. A cooling system characterized by controlling switching between the two. The cooling system according to claim 1 or 2,
The first circulation path includes a first forward path having both ends connected to the upstream storage section and the cooling tower, a first return path having both ends connected to the cooling tower and the downstream storage section, and the first return path. A second switching path having both ends connected to the first forward path, the upstream storage section and the cooling tower or the middle of the first return path, And a second switching valve provided in the second return path, wherein the third circulation path is a third forward path having both ends connected to the chiller and the downstream storage section, the chiller and the downstream side A third return path having both ends connected to the reservoir, a third switching valve provided in the third forward path, and a fourth switching valve provided in the third return path;
In the first mode, the first circuit is used by opening the first switching valve and closing the second switching valve, the third switching valve, and the fourth switching valve, and the second switching valve. In the mode, the second circulation path and the third circulation path are used by closing the first switching valve and opening the second switching valve, the third switching valve, and the fourth switching valve. A cooling system characterized by that. The cooling system according to any one of claims 1 to 3,
The cooling tower includes a pipe for passing the cooling water from the upstream storage section, a fan that rotates to blow air to the pipe, and a pipe sprinkler for spraying the cooling water to the pipe. A cooling system characterized by adjusting the cooling amount of cooling water sent through the piping by combining the presence or absence of watering and the presence or absence of fan rotation. The cooling system according to any one of claims 1 to 4,
The chiller has a compressor, a condenser, an evaporator, an expansion valve, and a conduit through which a refrigerant circulates. The cooling system according to any one of claims 1 to 5,
The cooling system, wherein the object to be cooled is a sake pack in which sake sterilized by heating at a certain temperature is contained in a container.

Images