JP2010210129A - Cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling system capable of improving cooling efficiency of ammonia and chlorofluorocarbon etc., reducing the size and saving energy. <P>SOLUTION: The cooling system includes: an ammonia detoxifying device 14; a discharge system having a discharge conduit 35 with one end side connected to inside of a cooler 17 and the other end side connected to the ammonia detoxifying device 14 and an normally-closed type opening/closing damper 36 for controlling opening/closing of the discharge conduit 35; an ammonia leakage detection sensor 28 for detecting leakage of an ammonia refrigerant; and a control part 13 for stopping the operation of an ammonia refrigerator 18, opening the opening/closing damper 36 of the discharge system, closing a cold air suction damper 25 and a blowout part damper 26, respectively and then, operating the ammonia detoxifying device 14 when leakage of the ammonia refrigerant is detected by the ammonia leakage detection sensor 28. The leaked ammonia refrigerant gas is forcedly recovered to the ammonia detoxifying device 14 via the discharge conduit 35. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooling system, and more particularly to a cooling system that uses a harmful gas having toxicity, irritating odor, flammability, etc., such as ammonia gas or chlorofluorocarbon, as a refrigerant.

  Conventionally, chlorofluorocarbon has been widely used as a refrigerant of a refrigeration apparatus used for indoor air conditioning and cooling / freezing of articles. However, part of the chlorofluorocarbons destroys the ozone layer, and if it leaks to the outside air, it causes global warming. Therefore, from the viewpoint of global environmental conservation such as prevention of ozone layer destruction and global warming, ammonia (NH3), which is a natural refrigerant, has been reviewed in place of Freon, and the adoption of refrigeration equipment that uses this ammonia as a refrigerant has increased. Yes.

  However, ammonia is harmful to the human body and emits an irritating odor. For this reason, if ammonia leaks into the room to be cooled, there is a risk of harming the human body, and there is a risk that the product will become defective due to odors attached to the product. Therefore, it is necessary to configure the cooling system so that safety can be sufficiently ensured even when ammonia gas leaks.

  Therefore, when cooling the room to be cooled with a cooling device that uses ammonia as a refrigerant, instead of supplying the cold heat of the ammonia refrigerant circuit directly to the load side, non-toxic carbon dioxide (CO2, "carbon dioxide gas") is used as the refrigerant. As a cooling system, a secondary refrigerant circuit used as a carbon dioxide refrigerant circuit, that is, a carbon dioxide refrigerant circuit is widely used. In this cooling system, the CO2 brine cooled by the ammonia refrigerant circuit is sent into the room to be cooled, and the room to be cooled is cooled by heat exchange between the CO2 brine and the room air. Even so, it does not flow into the room to be cooled (see, for example, Patent Document 1).

JP 2002-243350 A.

  However, in the cooling system in which a carbon dioxide refrigerant circuit is interposed and the CO2 brine is sent into the room to be cooled as in the cooling device described in Patent Document 1, the indirect cooling method is adopted, so the cooling efficiency is low and the power is low. Consumption increases slightly. In addition, there is a problem that the apparatus itself is increased in size. Furthermore, since both the ammonia refrigerant circuit and the carbon dioxide refrigerant circuit are driven, the operation control is complicated.

  Therefore, it is possible to directly supply the cooler of the refrigerant circuit using a refrigerant harmful to the human body and the global environment, such as ammonia and chlorofluorocarbon (hereinafter referred to as `` refrigerant harmful to the human body ''), to the cooler. There is a technical problem to be solved in order to provide a cooling system that can be improved and miniaturized and can save energy, and the present invention aims to solve this problem. And

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is provided in a cooled room, a cooler installed in the cooled room, and installed outside the cooled room. A cooling system connected to the refrigerator and the refrigerator, and a refrigerant pipe through which the refrigerant harmful to the human body or the like is circulated through the refrigerator and the refrigerator. A cool air suction part damper attached to the cool air suction part of the cooler, a cold air blow part damper attached to the cool air blow part of the cooler, and normally closed and attached to a part of the cooler. The discharge opening and closing means, a refrigerant leakage detection sensor for detecting leakage of the harmful refrigerant, and when the leakage of the harmful refrigerant is detected by the refrigerant leakage detection sensor, the operation of the refrigerator is stopped, and Cold air suction part damper and said blowout A control device for closing each of the dampers, and a discharge device that is detachably attached to the discharge opening / closing means and has a discharge conduit for discharging the leaked harmful refrigerant to the outside of the cooling chamber. It is to provide a cooling system.

  According to this structure, the cooler of a primary refrigerant circuit can be installed in a to-be-cooled room, and the air in a to-be-cooled room can be directly cooled with this cooler. In the unlikely event that harmful refrigerant gas leaks, it is detected by a refrigerant leak detection sensor, and the operation of the refrigerator is stopped, and the damper for the cool air intake section and the damper for the blowout section are closed to cool the leaked refrigerant. Prevent leakage into the room. Further, when the discharge conduit of the discharge device is connected to the discharge opening / closing means attached to a part of the cooler, the leaked harmful refrigerant gas can be discharged outside the chamber to be cooled through the discharge conduit.

  A second aspect of the present invention is the cooling system according to the first aspect, wherein a discharge fan for forcibly sucking and exhausting the leaked harmful refrigerant gas is attached to the discharge conduit of the discharge device. provide.

  According to this configuration, the leaked harmful refrigerant gas can be forcibly sucked and exhausted to the discharge conduit side on the air flow created by the discharge fan of the discharge conduit.

  The invention of claim 3 is connected to the room to be cooled, the cooler installed in the room to be cooled, the refrigerator installed outside the room to be cooled, the cooler and the refrigerator. A cooling system comprising a refrigerant pipe through which a refrigerant harmful to a human body or the like is circulated through the cooler and the refrigerator, wherein the cool air suction portion damper attached to the cool air suction portion of the cooler, and the cooling A damper for a cold air blowing portion attached to a cold air blowing portion of a container, a harmful refrigerant gas processing device that is provided outside the room to be cooled, absorbs and removes or temporarily stores the harmful refrigerant gas, and A discharge system device having a discharge conduit having one end connected in the cooler and the other end connected to the harmful refrigerant gas treatment device, and a normally closed opening / closing means for controlling opening and closing of the discharge conduit; Refrigerant leak detection to detect refrigerant leaks When the leakage of the harmful refrigerant is detected by the sensor and the refrigerant leakage detection sensor, the operation of the refrigerator is stopped, the opening / closing means of the discharge system device is opened, and the damper for the cold air intake unit And a control device that drives and operates the harmful refrigerant gas processing device after closing each of the blowout portion dampers, and leaking the harmful refrigerant gas to the harmful gas processing device via the discharge conduit. To provide a cooling system for forced recovery.

  According to this structure, the cooler of a primary refrigerant circuit can be installed in a to-be-cooled room, and the air in a to-be-cooled room can be directly cooled with this cooler. In the unlikely event that harmful refrigerant gas leaks, it is detected by a refrigerant leak detection sensor, and the operation of the refrigerator is stopped, and the damper for the cool air intake section and the damper for the blowout section are closed to cool the leaked refrigerant. Prevent leakage into the room. Further, the opening / closing means of the discharge system device can be opened to forcibly collect the leaked harmful refrigerant gas in the harmful gas processing device and process it.

  According to a fourth aspect of the present invention, in the configuration according to the third aspect, in the cooler, a refrigerant-feeding electromagnetic valve for blocking the liquefied harmful refrigerant flowing in the refrigerant pipe, and a cooling expansion valve A cooling system is provided.

  According to this configuration, the system can be made compact by providing the refrigerant liquid supply solenoid valve and the cooling expansion valve in the cooler.

  According to a fifth aspect of the present invention, in the configuration of the third or fourth aspect, between the cooler and the refrigerator, one end side is connected to the cooler and the other end side is connected to the refrigerator. A refrigerant pipe duct, the refrigerant pipe is installed in the refrigerant pipe duct, and one end side of the discharge pipe is connected to the cooler via at least a part of the refrigerant pipe duct. Providing a connected cooling system.

  According to this configuration, the harmful refrigerant gas leaked into the cooler and the harmful refrigerant gas leaked into the refrigerant pipe duct can be recovered and removed to the harmful gas processing apparatus side via the discharge conduit.

  According to a sixth aspect of the present invention, in the configuration of the third, fourth or fifth aspect, between the cooler and the refrigerator, one end side is connected to the cooler and the other end side is connected to the refrigerator. Discharge opening / closing provided with a refrigerant pipe duct connected to the refrigerant pipe and installing the refrigerant pipe in the refrigerant pipe duct and shutting off the cooler side and the refrigerator side in the refrigerant pipe duct Provided is a cooling system in which a barrier wall with means is provided and the duct for refrigerant piping and the discharge conduit are integrated.

  According to this configuration, when the harmful refrigerant gas leaks, if the opening / closing means for discharging the heat insulating wall is opened, the leaked harmful refrigerant gas can be collected and processed by the harmful gas processing device through the refrigerant pipe duct. This eliminates the need for a separate discharge conduit.

  According to a seventh aspect of the present invention, in the configuration according to the third, fourth, fifth, or sixth aspect, the discharge system device has a temperature up to a temperature at which the leaked refrigerant leaked into the discharge conduit changes from a liquid phase to a vapor phase. Provided is a cooling system provided with heating means capable of heating the inside of the discharge conduit.

  According to this configuration, the refrigerant leaked into the discharge conduit can be heated by the heating means, gasified, and efficiently recovered and removed.

  According to an eighth aspect of the present invention, in the configuration according to the third, fourth, fifth, sixth, or seventh aspect, the control device opens the cold air blowing portion damper when the discharge system device is in operation, and There is provided a cooling system in which a fan on a cooler side is reversely controlled so that the harmful refrigerant leaked by wind generated by the fan is sent to the harmful refrigerant gas processing apparatus side.

  According to this configuration, when the refrigerant leaks, the leaked harmful refrigerant gas can be efficiently sent toward the harmful refrigerant gas processing apparatus using the wind generated by the reverse rotation of the fan on the cooler side. .

  A ninth aspect of the invention provides a cooling system using an ammonia refrigerant as the refrigerant in the configuration of the third, fourth, fifth, sixth, seventh or eighth aspect.

  According to this configuration, a cooling system using ammonia as a refrigerant is obtained.

  According to the first aspect of the present invention, even in a cooling system that uses a refrigerant harmful to the human body or the like, a cooler using the refrigerant is installed in the cooled room, and the air in the cooled room and the Since the air in the cooled room can be cooled by directly exchanging heat between the two, the cooling efficiency is good and a large energy saving is possible. At the same time, the structure of the system equipment can be simplified and reduced in size, and the cost of the equipment and the maintenance cost can be saved. Also, in the unlikely event that harmful refrigerant gas leaks, it is detected by a refrigerant leak detection sensor, and the operation of the refrigerator is stopped, and the damper for the cold air intake part and the damper for the blowout part are closed, Since leakage refrigerant is prevented from leaking into the cooled room, safety can be expected. Further, since the harmful refrigerant gas leaked by connecting the discharge conduit of the discharge device to the cooler can be discharged outside the chamber to be cooled, higher safety can be obtained.

  According to the second aspect of the invention, the leaked harmful refrigerant gas is forcibly sucked and exhausted to the exhaust duct side on the air flow created by the discharge fan of the discharge conduit. In addition to the effect, the leaked harmful refrigerant gas can be further forcibly discharged, and the safety can be further improved.

  The invention described in claim 3 is a cooling system that uses a refrigerant harmful to a human body or the like, and a cooler using the refrigerant is installed in the room to be cooled, and the air in the room to be cooled and the Since the air in the cooled room can be cooled by directly exchanging heat between the two, the cooling efficiency is good and a large energy saving is possible. At the same time, the structure of the system equipment can be simplified and reduced in size, and the cost of the equipment and the maintenance cost can be saved. In the unlikely event that harmful refrigerant gas leaks, it is detected by a refrigerant leakage detection sensor, and the operation of the refrigerator is stopped, and the damper for the cold air intake part and the damper for the blowout part are closed, Since the leaked refrigerant is prevented from leaking into the room to be cooled, safety can be expected. Further, since the harmful refrigerant gas leaked by connecting the discharge conduit of the discharge device to the cooler can be discharged outside the chamber to be cooled, higher safety can be obtained. Further, the opening and closing means of the discharge system device can be opened to forcibly collect the leaked harmful refrigerant gas in the harmful gas processing device, and the recovered harmful refrigerant gas can be processed by the harmful gas processing device. In addition to the safety in the cooling room, global environmental conservation can also be expected.

  Since the invention according to claim 4 can be made compact by providing the refrigerant liquid supply solenoid valve and the cooling expansion valve in the cooler, in addition to the effect of the invention according to claim 3, the equipment structure can be further reduced in size. Can be expected to be effective.

  According to the fifth aspect of the present invention, the harmful refrigerant gas leaked into the cooler and the harmful refrigerant gas leaked into the duct for the refrigerant pipe can be collected and removed to the harmful gas processing apparatus side through the discharge conduit. Therefore, in addition to the effect of the invention according to claim 3 or 4, an effect of efficiently removing the leaked harmful refrigerant gas can be expected.

  In the invention described in claim 6, since the duct for refrigerant piping also serves as a discharge conduit, and it is not necessary to provide the discharge conduit separately, in addition to the effect of the invention described in claim 3, 4 or 5, the cost is also reduced. It will be advantageous.

  According to the seventh aspect of the present invention, the harmful refrigerant leaked into the discharge conduit can be heated and gasified by the heating means to be efficiently recovered and removed, so that the third, fourth, fifth or sixth aspect can be obtained. In addition to the effects of the described invention, safety is further improved.

  In the invention according to claim 8, when the refrigerant leaks, the leaked noxious refrigerant gas is forcibly sent toward the noxious gas treatment device side by the wind generated by the reverse rotation of the fan on the cooler side. Therefore, in addition to the effects of the invention according to claim 3, 4, 5, 6 or 7, harmful refrigerant gas can be efficiently recovered and removed by the harmful gas treatment device.

  In addition to the effects of the invention described in claim 3, 4, 5, 6, 7 or 8, the invention described in claim 9 uses, as a refrigerant, ammonia that provides cooling efficiency, energy saving, downsizing, safety, and the like. The effect of providing a cooling system can be expected.

The piping block diagram which shows 1st Example of the cooling system which concerns on this invention. The schematic block diagram of the control system in a cooling system same as the above. The flowchart showing the operation example of the control circuit in a cooling system same as the above. The piping block diagram which shows 2nd Example of the cooling system which concerns on this invention. The schematic block diagram of the control system in the cooling system of 2nd Example. The piping block diagram which shows 3rd Example of the cooling system which concerns on this invention. The piping block diagram which shows 4th Example of the cooling system which concerns on this invention.

  The present invention improves the cooling efficiency by making it possible to directly supply the cold heat of the refrigerant circuit using a refrigerant harmful to the human body and the global environment, such as ammonia and chlorofluorocarbon, and can be downsized. And in order to achieve the objective of aiming at energy saving, the to-be-cooled room, the cooler installed in the to-be-cooled room, the refrigerator installed on the outside of the to-be-cooled room, the cooler, A cooling system connected to a refrigerator and comprising a cooling pipe and a refrigerant pipe through which the refrigerant harmful to a human body or the like is circulated through the refrigerator, and a cold air intake attached to a cold air intake portion of the cooler A damper for a part, a damper for a cool air blowing part attached to a cold air blowing part of the cooler, a harmful refrigerant gas processing device that is provided outside the cooled chamber and absorbs and removes the harmful refrigerant gas; One in the cooler A discharge system apparatus having a discharge conduit having a side connected and a discharge conduit having the other end connected to the harmful refrigerant gas processing device, and a normally closed opening / closing means for controlling the opening and closing of the discharge conduit, and detecting leakage of the harmful refrigerant A refrigerant leakage detection sensor, and when the leakage of the harmful refrigerant is detected by the refrigerant leakage detection sensor, the operation of the refrigerator is stopped, the opening / closing means of the discharge system device is opened, and the cold air A control device that drives and operates the harmful refrigerant gas processing device after closing each of the suction portion damper and the blowout portion damper, and for discharging the leaked harmful refrigerant gas to the harmful gas processing device. This was realized by forcibly recovering through a conduit.

  Hereinafter, the cooling system of the present invention will be described with reference to preferred embodiments. In the following description, the case where ammonia is used as a refrigerant harmful to the human body or the like will be described. However, the present invention is not limited to the ammonia refrigerant, and a refrigerant harmful to the global environment such as Freon is used. It can also be applied to the case.

  1 to 3 show a first embodiment of a cooling system according to the present invention. In the figure, the cooling system includes a cooled room 10 such as a refrigerated warehouse, an ammonia refrigerant circuit 11 for cooling the cooled room 10, a discharge device 12, a control unit 13 as a control device, and a harmful gas. And an ammonia detoxifying device 14 as a processing device.

  The cooled room 10 is covered with an outer wall 15 having a heat insulating layer. Further, a temperature sensor 16 for detecting the temperature in the cooled chamber 10 is provided in the cooled chamber 10.

  The ammonia refrigerant circuit 11 is a cooling circuit that uses ammonia as a refrigerant, and includes a cooler (cooler) 17 installed in the cooled chamber 10, and an ammonia / refrigerant installed outside the cooled chamber 10. And a refrigerant pipe 19 for circulating ammonia refrigerant through the ammonia 17 and the refrigerator 18. The refrigerant pipe 19 is disposed through the outer wall body 15, one end side is connected to the cooler 17, and the other end side is connected to the ammonia / refrigerator 18.

  The ammonia / refrigerator 18 includes an ammonia receiver 20, a compressor 21, and a condenser 22, which are connected to the cooler 17 through the refrigerant pipe 19. In addition, in the medium distribution system path of the refrigerant pipe 19, a cooling expansion valve 23a, a refrigerant liquid feeding electromagnetic valve 23b for temporarily blocking the flow of ammonia refrigerant, and a plurality of stop valves 24, 24, 24 are provided. Is provided.

  Further, in the cooled chamber 10, the cooler 17 is attached to the cool air suction portion of the cooler 17 where the cooler 17 sucks the air in the cooled chamber 10, and the cooler There is provided a damper 26 for a cold air blowing portion attached to a cold air blowing portion of the cooler 17 that blows air (cold air) from 17 into the cooled chamber 10. An opening / closing damper 27 as an opening / closing means that is normally closed is provided in a part of the cooler 17, and the discharge device 12 can be attached to and detached from the cooler 17 via the opening / closing damper 27. Connected.

  The discharge device 12 includes a discharge conduit 12a and a discharge fan 12b attached to the discharge conduit 12a. One end side of the discharge conduit 12a is detachably connected to the cooler 17 via the opening / closing damper 27, and the other end side is detachably connected to the ammonia abatement device 14 and the like. Yes. In addition, when the ammonia detoxifying device 14 or the like capable of forcibly discharging the air in the cooler 17 through the discharge conduit 12a is provided as in the present embodiment, it is provided in the discharge conduit 12a. The discharged exhaust fan 12b may be omitted.

  The ammonia abatement device 14 is a device for bringing air containing ammonia into gas-liquid contact with water or an aqueous solution of a drug, and absorbing and removing the ammonia to release detoxified air into the atmosphere. There are various known configurations. In the present embodiment, the ammonia abatement apparatus 14 includes a tank 14a in which an aqueous solution W of water or medicine is stored, a water sprayer 14c that pumps up the aqueous solution W in the tank 14a with a pump 14b, and sprinkles water, and the discharge conduit 12a The air containing the ammonia in the cooler 17 is sucked into the tank 14a through the air and the blower 14d is exhausted outside (in the atmosphere) of the ammonia detoxifying device 14 through the sprinkler 14c.

  In the ammonia abatement device 14, when the air blower 14 d is driven and the air in the air blower 14 d is discharged to the outside while being connected to the cooler 17 via the discharge conduit 12 a, the tank The air containing ammonia leaked into the cooler 17 is pulled through the discharge conduit 12a into the tank 14a. The air drawn into the tank 14a passes through the sprinkler 14c and enters the blower 14d, and is then discharged into the atmosphere. Thus, when the air passes through the sprinkler 14c, the air containing ammonia comes into gas-liquid contact with the aqueous solution W, and the ammonia is absorbed by the aqueous solution W and removed.

  In the cooler 17 and the ammonia / refrigerator 18, when the ammonia in the ammonia refrigerant circuit 11 leaks, an ammonia leak detection sensor 28 is provided as a refrigerant leak detection sensor for detecting the leak of the ammonia. Is provided.

  FIG. 2 is a schematic block diagram of a control system in the cooling system shown in FIG. In the figure, a control unit 13 as a control device, a cooler 17, an ammonia / refrigerator 18, an open / close damper 27, an ammonia leakage detection sensor 28, and a temperature sensor 16 correspond to FIG.

  The control unit 13 includes an A / D converter 30, an input circuit 31, a central processing unit (CPU) 32, a memory 33, and an output circuit 34.

  In this control circuit configuration, analog temperature detection signals output from the ammonia leakage detection sensor 28 and the temperature sensor 16 are input to the A / D converter 30 of the control unit 13. The A / D converter 30 performs A / D conversion on these analog signals and outputs them to the input circuit 31 as digital signals. The input circuit 31 is an interface for inputting the digitized ammonia leakage output signal and the temperature detection signal to the central processing unit 32, respectively.

  In the central processing unit 32, based on various signals input from the input circuit 31, the ammonia / refrigerator 18, the cooler 17 (including the cold air intake damper 25 and the cold air discharge damper 26), the open / close damper 27, etc. Control the operation. The central processing unit 32 is connected to a memory 33 necessary for arithmetic processing.

  The output circuit 34 is an output interface for outputting control signals transmitted from the central processing unit 32 to the ammonia / refrigerator 18, the cooler 17, the opening / closing damper 27, and the like. The control signal output from the output circuit 34 is transmitted to each of these devices.

  FIG. 3 is a flowchart showing an operation example of the control circuit in the cooling system. The operation of the ammonia abatement process in the cooling system of FIG. 1 and the control circuit of FIG. 2 will be described with the flowchart of FIG.

  First, when an operation start signal for the cooling system is input, the control unit 13 drives the ammonia refrigerant circuit 11 and enters a cooling operation (step S1). At this time, the open / close damper 27 is closed. Further, during the cooling operation, the control unit 13 acquires the temperature in the cooled room 10 output from the temperature sensor 16 as a digital value. Then, the ammonia refrigerant circuit 11 is controlled in comparison with a preset temperature value, that is, the cooler 17 and the ammonia / refrigerator 18 are controlled to maintain the temperature in the controlled chamber 10 at a desired temperature. .

  Next, in step S <b> 2, the control unit 13 detects whether ammonia refrigerant has leaked in the cooler 17 or in the ammonia / refrigerator 18 from the value output by the ammonia leak detection sensor 28.

  If ammonia leakage has occurred, the control unit 13 stops the operation of the ammonia / refrigerator 18 and the operation of the cooler 17 in step S3. At the same time, the cool air suction damper 25 and the cool air blowing damper 26 on the cooler 17 side are closed. When the ammonia / refrigerator 18 is stopped, the ammonia refrigerant in the ammonia refrigerant circuit 11 is collected in the receiver 20 and then the compressor 21 is stopped. After that, the necessary ammonia removal treatment is performed.

  In the ammonia detoxification process in the first embodiment, when ammonia leaks into the cooler 17, the other end side of the discharge conduit 12 a connected to the ammonia detoxifying device 14 is connected to an open / close damper. Then, the open / close damper 27 is opened, and the ammonia detoxifying device 14 is activated to perform the ammonia detoxification process. Further, the discharge fan 12b of the discharge device 12 is also driven as necessary. On the other hand, when ammonia leakage occurs in the ammonia / refrigerator 18, one end side of the discharge conduit 12a is connected to the ammonia / refrigerator 18 to perform ammonia detoxification treatment.

  Therefore, in the cooling system of the first embodiment, even if ammonia refrigerant gas leaks, it is detected by the ammonia leak detection sensor 28, and the operation of the cooler 17 and the ammonia / refrigerator 18 is stopped. Sex can be expected. Moreover, since the cold heat of the ammonia refrigerant circuit 11 is directly supplied to the cooler 17, the cooling efficiency is good and it can contribute to energy saving.

  Next, the cooling system in 2nd Example of this invention is demonstrated with reference to FIG.4 and FIG.5. The cooling system of the second embodiment is configured to automatically abate the leaked ammonia refrigerant gas when leakage of the ammonia refrigerant is detected. The same components as in FIGS. 1 and 2 Are denoted by the same reference numerals and redundant description is omitted.

  The cooling system in the second embodiment is installed in a state where the ammonia abatement apparatus 14 is always connected to the cooler 17 and the ammonia / refrigerator 18 via the discharge conduit 35. That is, one end side of the discharge conduit 35 is connected to the ammonia abatement apparatus 14 and the other end side is branched into two. In the other end branched into two, one other end is connected to the cooler 17 and the other end is connected to the ammonia / refrigerator 18. In addition, an opening / closing damper 36 as an opening / closing means is provided in a portion of the discharge conduit 35 disposed between the cooler 17 and the ammonia abatement apparatus 14.

  Further, in the cooling system in the second embodiment, the ammonia abatement apparatus 14 is connected to the control unit 13 as shown in FIG. 5, and is activated by the control unit 13 when the leakage of the ammonia refrigerant is detected. The refrigerant detoxification process is automatically performed.

  That is, in the cooling system according to the second embodiment, when the operation start signal of the cooling system is input, the control unit 13 drives the ammonia refrigerant circuit 11 and enters the cooling operation. At this time, the open / close damper 36 is closed, and the ammonia abatement apparatus 14 is stopped. Further, during the cooling operation, the control unit 13 acquires the temperature in the cooled chamber 10 output from the temperature sensor 16 as a digital value, and controls the cooler 17, the ammonia / refrigerator 18, and the like, respectively. The temperature within 10 is maintained at the desired temperature.

  During operation, when it is detected from the value output by the ammonia leakage detection sensor 28 that ammonia refrigerant is leaking into the cooler 17 or the ammonia / refrigerator 18, the control unit 30 The operation of the refrigerator 18 and the operation of the cooler 17 are stopped. At the same time, the cool air suction damper 25 and the cool air blowing damper 26 on the cooler 17 side are closed. In addition, the ammonia abatement device 14 is driven and the open / close damper 36 is opened to automatically start the ammonia abatement process.

  Therefore, in the cooling system of the second embodiment, even if ammonia refrigerant gas leaks, it is detected by the ammonia leak detection sensor 28, and the leaked ammonia is recovered by the ammonia abatement device 14 and automatically Therefore, safety can be expected. Moreover, since the cold heat of the ammonia refrigerant circuit 11 is directly supplied to the cooler 17, the cooling efficiency is good and it can contribute to energy saving.

  Next, the cooling system in 3rd Example of this invention is demonstrated with reference to FIG. In the cooling system of the third embodiment, a refrigerant pipe duct 37 penetrating the outer wall 15 is added to the configuration shown in FIG. 4 and connected to the cooler 17 in the middle of the refrigerant pipe duct 37. Since one end of the discharge conduit 35 to be connected is connected and the other configuration is the same as that of FIG. 4, the same components are denoted by the same reference numerals, and redundant description is omitted.

  In the third embodiment, the circulating refrigerant pipe 19 is disposed in the refrigerant pipe duct 37. The refrigerant piping duct 37 is provided with the same ammonia leakage detection sensor 28 as that in the cooler 17 and the ammonia / refrigerator 18 and further insulates the inside and outside of the cooled chamber 10 from each other. A blocking wall 38 is provided.

  In the third embodiment, the ammonia refrigerant leaks into the cooler 17, the refrigerant pipe duct 37, or the ammonia / refrigerator 18 from the value output by the ammonia leak detection sensor 28 during operation. Is detected, the control unit 30 stops the operation of the ammonia / refrigerator 18 and the operation of the cooler 17. At the same time, the cool air suction damper 25 and the cool air blowing damper 26 on the cooler 17 side are closed. In addition, the ammonia abatement device 14 is activated, and the open / close damper 36 is opened to automatically start the ammonia abatement treatment, and leak into the cooler 17, the refrigerant pipe duct 37, or the ammonia / refrigerator 18. The ammonia refrigerant thus recovered is recovered and removed on the ammonia abatement device 14 side via the discharge conduit 35.

  Therefore, even in the cooling system of the third embodiment, if the ammonia refrigerant gas leaks, it is detected by the ammonia leak detection sensor 28, and the leaked ammonia is recovered by the ammonia abatement device 14 and automatically absorbed / removed. Since it is removed, safety can be expected. Moreover, since the cold heat of the ammonia refrigerant circuit 11 is directly supplied to the cooler 17, the cooling efficiency is good and it can contribute to energy saving. Furthermore, since the outside of the refrigerant pipe 19 is covered with the refrigerant pipe duct 37, even if ammonia refrigerant leaks from the middle of the refrigerant pipe 19, the refrigerant pipe 19 leaks outside the refrigerant pipe duct 37. Can be recovered and processed without any problems.

  A cooling system according to a fourth embodiment of the present invention will be described with reference to FIG. In the cooling system of the fourth embodiment, a part of the refrigerant piping duct 37 and the discharge conduit 35 are integrated with each other in place of a part of the refrigerant piping duct 37 and the discharge conduit 35 having the configuration shown in FIG. Since the unitized duct 39 is provided and the other configurations are the same as those in FIG. 4, the same components are denoted by the same reference numerals and redundant description is omitted.

  The unitized duct 39 is provided with a blocking wall 40 that insulates between the inside and the outside of the cooled chamber 10. Further, the opening / closing damper 36 and the refrigerant pipe 19 are disposed through the blocking wall 40. Further, the unitized duct 36 is provided with the same ammonia leakage detection sensor 28 as that in the cooler 17 and the ammonia / refrigerator 18. The unitized duct 36 has one end connected to the cooler 17 and the other end connected to the ammonia / refrigerator 18. The ammonia abatement device 14 is connected to the ammonia / refrigerator 18 through an exhaust duct 41.

  In the fourth embodiment, leakage of ammonia refrigerant is detected in the cooler 17, in the unitized duct 39, or in the ammonia / refrigerator 18 from the value output by the ammonia leak detection sensor 28 during operation. Then, the control unit 30 stops the operation of the ammonia / refrigerator 18 and the cooler 17 and simultaneously closes the cool air intake damper 25 and the cool air blowing damper 26 on the cooler 17 side. Thereafter, the opening damper of the ammonia / refrigerator 8 is closed. At the same time, the ammonia abatement device 14 is driven, and the open / close damper 36 is opened to automatically start the ammonia abatement treatment, and leaks into the cooler 17 or the unitized duct 39 or the ammonia / refrigerator 18. The ammonia refrigerant is recovered and removed on the ammonia abatement device 14 side via the unitized duct 39.

  Therefore, even in the cooling system of the fourth embodiment, if the ammonia refrigerant gas leaks, it is detected by the ammonia leak detection sensor 28, and the leaked ammonia is recovered by the ammonia abatement device 14 and automatically absorbed / removed. Since it is removed, safety can be expected. Moreover, since the cold heat of the ammonia refrigerant circuit 11 is directly supplied to the cooler 17, the cooling efficiency is good and it can contribute to energy saving. Furthermore, since the outside of the refrigerant pipe 19 is covered with the unitized duct 39, even if ammonia refrigerant leaks from the middle of the refrigerant pipe 19, it does not leak outside the unitized duct 39. It can be recovered and processed. Further, the structure can be simplified as compared with the cooling system of the third embodiment.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  For example, in the third and fourth embodiments, heating means such as a heater is provided in a part of the discharge conduit 35 and the unitized duct 39, and the ammonia refrigerant leaked into the ducts 35 and 39 is discharged from the liquid phase. When the ducts 35 and 36 are heated to a temperature that changes to the phase, the ducts 35 and 39 can be recovered without frost adhering to the ducts 35 and 39 at the time of recovery. In this case, the power can be turned on simultaneously with the driving of the ammonia abatement apparatus 14.

  As a method for forcibly sending the leaked ammonia in the discharge conduit 15 to the ammonia abatement device 14, a fan or the like is separately installed in the discharge conduit 35 or the unitized duct 39, and the fan is generated. It may be sent in the wind. Further, the damper 25 for the cool air blowing section on the cooler 17 side is opened, and the fan on the cooler 17 side is reversely controlled, and the leaked ammonia is sent to the ammonia abatement device 14 on the wind generated by the fan. You may do it.

  Furthermore, in the first to fourth embodiments, when ammonia leakage occurs, it is connected to the ammonia abatement device 14 and the ammonia abatement device 14 is used to absorb and remove the ammonia refrigerant. The harmful refrigerant gas may be stored in a temporary storage container (ammonia refrigerant temporary storage container or the like) and processed later by the ammonia abatement device 14 or the like.

  As described above, according to the present invention, even if ammonia gas leaks, it is detected by the ammonia leak detection sensor 28, and ammonia is automatically absorbed and removed by the ammonia abatement device 14, thereby achieving high safety. Therefore, the present invention can be applied not only to a freezer warehouse but also to a freezer showcase, for example.

10 Cooled Room 11 Ammonia Refrigerant Circuit 12 Discharge Device 12a Discharge Conduit 12b Discharge Fan 13 Control Unit (Control Device)
14 Ammonia detoxification equipment (toxic gas treatment equipment)
14a Tank 14b Pump 14c Sprinkler 14d Blower 15 Outer wall 16 Temperature sensor 17 Cooler 18 Ammonia / refrigerator 19 Refrigerant piping 20 Ammonia / receiver 21 Compressor 22 Condenser 23a Expansion valve 23b Refrigerant liquid feed solenoid valve 24 Stop valve 25 Cold air suction part damper 26 Cold air blowing part damper 27 Opening and closing damper (opening and closing means)
28 Ammonia leak detection sensor (refrigerant leak detection sensor)
30 A / D converter 31 Input circuit 32 Central processing unit (CPU)
33 Memory 34 Output circuit 35 Discharge conduit 36 Open / close damper (discharge open / close means)
37 Duct for refrigerant piping 38 Shielding wall 39 Unitized duct 40 Shielding wall 41 Exhaust duct W Aqueous solution

Claims (9)

A room to be cooled; a cooler installed in the room to be cooled; a refrigerator installed outside the room to be cooled; and the cooler and the refrigerator connected to the cooler and the refrigerator. In a cooling system comprising a refrigerant pipe through which refrigerant harmful to the human body is circulated,
A damper for the cold air suction part attached to the cold air suction part of the cooler;
A damper for a cold air outlet attached to the cold air outlet of the cooler;
A discharge opening / closing means that is normally closed and attached to a part of the cooler;
A refrigerant leakage detection sensor for detecting leakage of the harmful refrigerant;
A control device for stopping the operation of the refrigerator when the leakage of the harmful refrigerant is detected by the refrigerant leakage detection sensor, and closing the damper for the cold air intake unit and the damper for the blowing unit,
A discharge device that is detachably attached to the discharge opening / closing means and has a discharge conduit for discharging the leaked harmful refrigerant to the outside of the cooling chamber;
A cooling system comprising:   2. The cooling system according to claim 1, wherein a discharge fan for forcibly sucking and exhausting the leaked harmful refrigerant gas is attached to the discharge conduit of the discharge device. A room to be cooled; a cooler installed in the room to be cooled; a refrigerator installed outside the room to be cooled; and the cooler and the refrigerator connected to the cooler and the refrigerator. In a cooling system comprising a refrigerant pipe through which refrigerant harmful to the human body circulates,
A damper for the cold air suction part attached to the cold air suction part of the cooler;
A damper for a cold air outlet attached to the cold air outlet of the cooler;
A harmful refrigerant gas processing device that is provided outside the chamber to be cooled and absorbs and removes or temporarily stores the harmful refrigerant gas;
A discharge system device having a discharge conduit having one end connected to the cooler and the other end connected to the harmful refrigerant gas treatment device, and a normally closed opening / closing means for controlling the opening and closing of the discharge conduit;
A refrigerant leakage detection sensor for detecting leakage of the harmful refrigerant;
When the leakage of the harmful refrigerant is detected by the refrigerant leakage detection sensor, the operation of the refrigerator is stopped, the opening / closing means of the discharge system device is opened, and the damper for the cold air intake unit and the blowout A control device for driving and operating the harmful refrigerant gas treatment device after closing the respective dampers;
The cooling system is characterized in that the leaked harmful refrigerant gas is forcibly recovered by the harmful gas processing device via the discharge conduit.   4. The cooling system according to claim 3, wherein a cooling liquid supply solenoid valve for blocking the liquefied harmful refrigerant flowing through the refrigerant pipe and a cooling expansion valve are provided in the cooler.   Between the cooler and the refrigerator, there is provided a refrigerant pipe duct having one end connected to the cooler and the other end connected to the refrigerator, and the refrigerant pipe duct includes the above 5. The cooling system according to claim 3, wherein a refrigerant pipe is installed, and one end side of the discharge conduit is connected to the cooler via at least a part of the duct for the refrigerant pipe. .   A refrigerant pipe duct having one end connected to the cooler and the other end connected to the refrigerator is provided between the cooler and the refrigerator, and the refrigerant pipe duct has The refrigerant pipe is installed, and the refrigerant pipe duct is provided with a blocking wall with discharge opening / closing means for blocking the cooler side and the refrigerator side, and the refrigerant pipe duct, the discharge pipe, The cooling system according to claim 3, wherein the cooling system is integrated.   4. A heating means capable of heating the inside of the discharge conduit to a temperature at which the leaked refrigerant leaked into the discharge conduit changes from a liquid phase to a gas phase. , 4, 5 or 6.   The control device opens the cold air blowing part damper when the exhaust system device is in operation, and reversely controls the fan on the cooler side to cause the harmful refrigerant leaked by the wind generated by the fan. 77. The cooling system according to claim 3, 4, 5, 6 or 76, wherein the refrigerant is sent to the harmful refrigerant gas processing device side.   The cooling system according to claim 3, 4, 5, 6, 7 or 8, wherein ammonia refrigerant is used as the refrigerant.

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