JP2013142524A - Water cooler/water heater or steam generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cooler/water heater or a steam generator, preventing pollution of water by refrigerant oil leaking together with a refrigerant by promptly detecting a refrigerant leak from a plate type heat exchanger.SOLUTION: A water cooler/water heater or steam generator includes a plate type heat exchanger 4 that is a cooling part 3 forming a refrigerant flow path 16 by joining two metal plates. The two metal plates are provided with: first joining lines 17 for forming the refrigerant flow path 16; and second joining lines 18 for surrounding the first joining lines 17 outside the joining lines 17. A section part 19 formed between the first joining lines 17 and the second joining lines 18 is provided with a refrigerant leak detection means 20 for detecting the refrigerant leak into the section part 19. When the refrigerant leak from the refrigerant flow path 16 is present by the peeling or the like of the first joining lines 17 for forming the refrigerant flow path 16, the second joining lines 18 surrounding the first joining lines 17 prevent the leak of the refrigerant and the refrigerant oil to a water side, and the leak of the refrigerant is detected inside the section part 19 formed between the first joining lines 17 and the second joining lines 18.

Description

  The present invention relates to a chilled water device / hot water device or a steam generator provided with a plate type heat exchanger that joins two metal plates to form a refrigerant flow path.

A cold water type chilled water device that supplies cold water to the load side as needed, and a heat exchanger through which the refrigerant passes. There is known an ice storage type chilled water device (see, for example, Patent Document 1) in which ice is generated on the surface and chilled water is supplied while melting the generated ice.
Conventionally, in a heat exchanger used in such a device, as described in Patent Document 1, heat in which a plate-like fin is formed between a heat transfer tube in which a refrigerant flow path is bent in a bellows shape and the heat transfer tube is used. As described in Patent Document 2, a plate-type heat exchanger formed by joining two metal plates and expanding a refrigerant flow path is used.
However, in the chilled water device using the heat exchanger described in Patent Document 1, depending on the state of the stored water, the quality of the welded portion, corrosion from the outside, or pressure increase on the refrigerant side may cause the refrigerant flow path. In the plate-type heat exchanger described in Patent Document 2, the joint is formed by fatigue due to repeated stress on the joint forming the flow path or water penetration into the joint and freezing. The part may peel off. In any case, in the chilled water device using the heat exchanger placed in the water in this way, the refrigerant oil mixed with the refrigerant and the refrigerant leaks into the water due to damage to the heat exchanger, and the refrigerant oil There is a risk of contamination.

  As a means to detect refrigerant leakage from the heat exchanger, the cold water inlet temperature of the evaporator (heat exchanger) that produces cold water and the refrigerant pressure in the evaporator are detected and calculated from the refrigerant pressure of the evaporator during operation When the state where the difference between the evaporation temperature and the cold water outlet temperature is greater than a predetermined value for operation continues for a predetermined time or longer, there is a case in which refrigerant leakage is determined (for example, see Patent Document 3).

JP 2000-88297 A JP-A-8-200909 JP 2010-210098 A

  In order to minimize water contamination due to refrigerant oil leaks, leak detection as early as possible is necessary. However, in the refrigerant leak detection method described in Patent Document 3, the change in the water temperature in the stored tank is affected by the temperature of the water when the leak occurs and the amount of the stored water. Therefore, there is a problem that early detection is difficult.

  An object of the present invention is to provide a chilled water device, a hot water device, or a steam generator capable of quickly detecting refrigerant leakage from a plate-type heat exchanger and preventing water contamination by refrigerant oil leaking together with the refrigerant. There is to do.

  In order to achieve the above object, the invention described in claim 1 is a chilled water apparatus / hot water provided with a plate-type heat exchanger serving as a cooling unit that joins two metal plates to form a refrigerant flow path. An apparatus or a steam generator, wherein the two metal plates have a first joint line portion that forms a refrigerant flow path, and a first joint line portion that surrounds the first joint line portion outside the first joint line portion. Two junction line portions are provided, and a refrigerant leak detection means for detecting refrigerant leakage into the partition portion is provided in a partition portion formed between the first joint line portion and the second joint line portion. To do.

  According to the first aspect of the present invention, the second joint line surrounds the first joint line when the refrigerant leaks from the coolant flow path due to peeling of the first joint forming the coolant flow path or the like. In addition to preventing leakage of refrigerant and refrigerant oil to the water side, the refrigerant leaks in the partition formed between the first joint line part and the second joint line part. Can be detected.

  According to a second aspect of the present invention, the partition portion according to the first aspect is formed in an airtight manner, and the refrigerant leak detection means includes a pressure detection conduit communicating with the partition portion provided in the partition portion. And a pressure detection means provided in the pressure detection conduit for measuring the pressure in the compartment.

  According to the second aspect of the present invention, when there is a refrigerant leak from the refrigerant flow path due to peeling of the first joint section forming the refrigerant flow path, the first joint line section and the second joint line section By detecting an increase in the pressure in the partition formed between them by the pressure detection means, it is possible to detect the leakage of the refrigerant.

  According to a third aspect of the present invention, a plurality of the plate type heat exchangers according to the second aspect are prepared, refrigerant flow paths of the plate type heat exchangers are connected in parallel, and the plate type heat exchangers are connected. A communication pipe is provided in the partition part of the exchanger so as to communicate with each other by the pressure detection conduit, and the pressure detection means for measuring the pressure in the partition part is provided in the communication pipe. To do.

  According to the invention described in claim 3, a plurality of plate-type heat exchangers used in the chilled water device, the hot water device or the steam generator are communicated in parallel every several sheets, and the first joining is performed for each group. Since the pressure in the partition formed between the wire part and the second joint line part is detected by one pressure detecting means, it is not necessary to provide individual pressure detecting means for each plate type heat exchanger. Even if there is a refrigerant leak in any of the connected plate-type heat exchanger groups, it is possible to reliably detect the refrigerant leak while keeping the cost low.

  According to a fourth aspect of the present invention, the refrigerant leak detecting means according to the first aspect of the present invention includes an open conduit that communicates with the compartment provided in the compartment and opens to the atmosphere, and the open conduit includes It is characterized by comprising temperature detecting means provided.

  According to the fourth aspect of the present invention, when there is a refrigerant leak from the refrigerant flow path due to peeling of the first joint line portion that forms the refrigerant flow path, the refrigerant leaked into the compartment Since the temperature detecting means provided in the open conduit detects the refrigerant temperature when it is discharged to the atmosphere through the refrigerant, leakage of the refrigerant can be detected.

  According to a fifth aspect of the present invention, a plurality of the plate type heat exchangers according to the fourth aspect are prepared, refrigerant flow paths of the plate type heat exchangers are connected in parallel, and the plate type heat exchangers are connected. The partition section of the exchanger communicates with each other by the open conduit, and the temperature detecting means is provided in the open conduit.

  According to the invention described in claim 5, a plurality of plate-type heat exchangers used in the chilled water device, the hot water device, or the steam generator are connected in parallel every several sheets to form a group. Since the temperature of the refrigerant discharged to the atmosphere from the partition formed between the first joint line part and the second joint line part is detected by one temperature detection means for each plate type heat exchange There is no need to provide separate pressure detection means in the chamber, and it is possible to reliably detect refrigerant leakage even if refrigerant leakage occurs in any of the connected plate-type heat exchangers while keeping costs low. Can do.

  According to a sixth aspect of the present invention, the refrigerant leak detecting means according to the first aspect of the present invention includes an open conduit that communicates with the inside of the compartment provided in the compartment and opens to the atmosphere, and the open conduit includes And a refrigerant sensor provided.

  According to the sixth aspect of the present invention, when there is a refrigerant leak from the refrigerant flow path due to peeling of the first joint line portion forming the refrigerant flow path, the refrigerant leaked into the compartment Since the refrigerant sensor provided in the open conduit detects the refrigerant that passes through the atmosphere, leakage of the refrigerant can be detected.

  According to a seventh aspect of the present invention, a plurality of the plate type heat exchangers according to the sixth aspect are prepared, the refrigerant flow paths of the plate type heat exchangers are connected in parallel, and the plate type heat exchangers are connected. The partition section of the exchanger communicates with each other by the open conduit, and the refrigerant sensor is provided in the open conduit.

  According to the invention described in claim 7, a plurality of plate-type heat exchangers used in the chilled water device, the hot water device, or the steam generating device are connected in parallel every several sheets to form a group. Since the refrigerant discharged to the atmosphere from the partition formed between the first joint line part and the second joint line part is detected by one refrigerant sensor for each plate type heat exchanger individually It is not necessary to provide the refrigerant sensor, and it is possible to reliably detect the refrigerant leak even if there is a refrigerant leak in any of the connected plate heat exchanger groups while keeping the cost low.

  According to the present invention, a plate-type heat exchanger serving as a cooling unit provided in a chilled water device, a hot water device, or a steam generator includes a first joining line portion that forms a refrigerant flow path in two metal plates, A second joint line portion is provided outside the first joint line portion so as to surround the first joint line portion, and the partition portion formed between the first joint line portion and the second joint line portion is inserted into the partition portion. By providing the refrigerant leak detecting means for detecting the refrigerant leak, the second joint line portion is the first when the refrigerant leaks from the refrigerant passage due to peeling of the first joint line portion forming the refrigerant passage. Since it is provided so as to surround the joint line part, in addition to preventing leakage of refrigerant and refrigerant oil to the water side, in the partition part formed between the first joint line part and the second joint line part The refrigerant leakage can be detected by the refrigerant, so that the refrigerant leakage can be confirmed before the refrigerant leaks into the water where heat is exchanged. According contamination of water can be effectively prevented.

It is a perspective view which shows the 1st example of embodiment of the cold water apparatus / hot water apparatus which concerns on this invention, or a steam generator. It is a principal part schematic front view of this example. It is the sectional view on the AA line of FIG. It is a principal part schematic front view which shows the other examples of a 2nd joining line part. It is the BB sectional view taken on the line of FIG. It is a principal part schematic perspective view which shows the 2nd example of embodiment of the cold water apparatus / hot water apparatus which concerns on this invention, or a steam generator. It is a principal part schematic front view which shows the 3rd example of embodiment of the cold water apparatus / hot water apparatus which concerns on this invention, or a steam generator. It is a principal part schematic perspective view which shows the 4th example of embodiment of the cold water apparatus / hot water apparatus which concerns on this invention, or a steam generator. It is a principal part schematic front view which shows the 5th example of embodiment of the cold water apparatus / hot water apparatus which concerns on this invention, or a steam generator. It is a principal part schematic perspective view which shows the 6th example of embodiment of the cold water apparatus / hot water apparatus which concerns on this invention, or a steam generator.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the cold water apparatus, warm water apparatus, or steam generator which concerns on this invention is demonstrated in detail with reference to the Example shown on drawing.
FIG. 1 is a perspective view showing a first example of an embodiment of a cold water apparatus / hot water apparatus or a steam generator according to the present invention, FIG. 2 is a schematic front view of the main part of this example, and FIG. FIG. 4 is a schematic sectional front view showing another example of the second joining line portion, and FIG. 5 is a sectional view taken along line BB in FIG.

  This example is an embodiment in the case where the present invention is a chilled water device, and the chilled water device 1 of the present example includes a water storage tank 2 and a plate heat exchanger 4 serving as a cooling unit 3 provided in the water storage tank 2. And a refrigerator 5 for supplying a refrigerant to the plate heat exchanger 4. The plate heat exchanger 4 and the refrigerator 5 are connected by a refrigerant circulation path 6, and an expansion valve 7 and a liquid electromagnetic valve 8 are provided in the suction path 6 a of the refrigerant circulation path 6. Connected to the water storage tank 2 are a water supply path 9 for supplying water into the water storage tank 2 and a water supply path 10 for supplying cold water cooled by heat exchange in the water storage tank 2 by the plate heat exchanger 4 to the load side. The water supply passage 9 is provided with a water supply valve 11, and the water supply passage 10 is provided with a water supply pump 12. Further, the water storage tank 2 is provided with a water level control cylinder 13 on the outside so that the water level in the water storage tank 2 is detected, and when the water level falls below a predetermined amount, an opening command is issued to the water supply valve 11 to supply water. It has become. A drainage channel 30 is connected to the bottom of the water storage tank 2, and a drainage valve 31 is provided in the drainage channel 30.

  In the plate heat exchanger 4, a first joint line 17 that forms the refrigerant flow path 16 is formed between the two metal plates 14 and 15, and a first joint line is formed outside the first joint line 17. A second joint line portion 18 is provided so as to surround the portion 17, a partition portion 19 is formed between the first joint line portion 17 and the second joint line portion 18, and the partition portion 19 is connected to the partition portion 19. The refrigerant leak detecting means 20 for detecting the refrigerant leak is provided.

  More specifically, the first joint line portion 17 provided on the two metal plates 14 and 15 is provided by welding, and a portion surrounded by the first joint line portion 17 is expanded to flow the refrigerant. A path 16 is formed. A refrigerant inflow pipe 21 is provided at one end of the refrigerant flow path 17, and a refrigerant outflow pipe 22 is provided at the other end. The refrigerant inflow pipe 21 is connected to the discharge path 6 b of the refrigerant circulation path 6, and the refrigerant outflow The pipe 22 is connected to the suction path 6 a of the refrigerant circulation path 6.

Furthermore, the 2nd joining line part 18 provided so that the 1st joining line part 17 may be enclosed on the outer side of the 1st joining line part 17 is provided by welding, and the division part 19 is formed in the airtight state.
In this example, as shown in FIGS. 2 and 3, the second joint line portion 18 is provided around the two metal plates 14 and 15 that are overlapped, but is not necessarily around the metal plates 14 and 15. There is no need. As shown in FIGS. 4 and 5, the second joint line portion 18 may be provided so as to surround the first joint line portion 17.
However, when the cold water apparatus 1 is used as a cold water type, the second joint line portion 18 may be provided so as to surround the first joint line portion 17 as shown in FIGS. However, when the chilled water device 1 is used as an ice storage type, the second joining line portion 18 has two metal plates 14 overlapped with each other as shown in FIGS. , 15 is required to be provided around the periphery.
Further, the joining means of the second joining line portion 18 is not limited to welding, but may be a rubber packing (not shown). When the second joining line portion 18 is a rubber packing, the rubber packing is sandwiched between the metal plates 14 and 15 and the metal plates 14 and 15 are tightened with bolts or the like so that the partition portion 19 is kept airtight. deep.
The first joint line 17 has a welding strength lower than the strength of the metal plates 14 and 15 corresponding to the stress caused by the pressure change accompanying the supply and stop of the coolant into the coolant channel 16, thereby Without being leaked to the side, it can be reliably guided to the refrigerant leak detection means 20 for detection.

  In the refrigerant leakage detection means 20 for detecting refrigerant leakage into the partition part 19, in this example, a pressure detection conduit 23 communicating with the partition part 19 provided in the partition part 19, and a pressure detection conduit. And a pressure detecting means 24 for detecting the pressure in the partition part 19. As the pressure detection means 24, a pressure sensor, a pressure switch, or the like is used.

  The chilled water device 1 of this example supplies water from the water supply channel 9 into the water storage tank 2, and cool water cooled by exchanging heat in the water storage tank 2 by the plate heat exchanger 4 from the water supply channel 10 to the load side. It is a type that feeds water and drains it as it is, but it connects to a circulation path (not shown), supplies water to the load side, returns the used water from the circulation path to the water storage tank 2, and cools it again. It is also possible to use a circulating type that supplies cold water to the load side.

When the chilled water device 1 of this example configured as described above is an ice storage type, the following operation is performed.
The operation of the ice storage type chilled water device 1 includes a water supply process for storing water in the water storage tank 2, an ice storage process for generating and storing ice, and a cold water extraction process for melting the generated ice and taking out the cold water. Divided.
[Water supply process]
Water is stored in the water storage tank 2. When the water level in the water storage tank 2 is not at the predetermined water level, the water supply valve 11 is opened to supply water to the predetermined water level. When the water level control cylinder 13 detects an appropriate water level, the water supply valve 11 is closed and the water supply process is completed.
[Ice storage process]
When the water supply process is completed, the liquid electromagnetic valve 8 provided in the discharge path 6a of the refrigerant circulation path 6 is opened, the refrigerant compressed by the refrigerator 5 is expanded by the expansion valve 7, and the refrigerant flow path of the plate heat exchanger 4 is expanded. The refrigerant is supplied to 16 to generate freezing on the surface of the plate heat exchanger 4, and when the freezing grows on the surface of the plate heat exchanger 4, the refrigerator 5 is stopped and the ice storage process is completed.
[Cold water extraction process]
The water supply valve 11 is opened, normal temperature water is supplied into the water storage tank 2, the ice generated in the ice storage process is melted, and cold water is supplied from the water supply path 10 to the load by the water supply pump 12.
In this cold water extraction process, the refrigerator 5 continues to operate even after freezing grows on the surface of the plate heat exchanger 4, and the water supply valve 11 is opened to supply room temperature water into the water storage tank 2, and in the ice storage process. While the generated ice is melted, cold water is produced while exchanging heat between the water flowing on the surface of the plate heat exchanger 4 and the refrigerant flowing in the plate heat exchanger 4, and supplied to the load.

Moreover, when the cold water apparatus 1 of this example is a cold water type, it becomes the following operation | movement.
The operation of the ice storage type cold water apparatus 1 is divided into a water supply process for storing water in the water storage tank 2, a cooling process for cooling the water, and a cold water extraction process for taking out the cooled cold water.
[Water supply process]
Water is stored in the water storage tank 2. When the water level in the water storage tank 2 is not at the predetermined water level, the water supply valve 11 is opened to supply water to the predetermined water level. When the water level control cylinder 13 detects an appropriate water level, the water supply valve 11 is closed and the water supply process is completed.
[Cooling process]
When the water supply process is completed, the liquid electromagnetic valve 8 provided in the discharge path 6a of the refrigerant circulation path 6 is opened, the refrigerant compressed by the refrigerator 5 is expanded by the expansion valve 7, and the refrigerant flow path of the plate heat exchanger 4 is expanded. The refrigerant is flowed to 16 to cool the water in the water storage tank 2 to a predetermined temperature. When the water in the water storage tank 2 is cooled to a predetermined temperature, the refrigerator 5 is stopped and the cooling process is completed.
[Cold water extraction process]
The cold water cooled in the cooling process is supplied from the water supply path 10 to the load by the water supply pump 12.

  According to the chilled water device 1 of this example operated as described above, in the plate-type heat exchanger 4 serving as the cooling unit 3 provided in the water storage tank 2, the first joint 17 that forms the refrigerant flow path 16 is provided. When there is damage such as peeling, the refrigerant leaks into the compartment 19 formed between the first joint line 17 and the second joint line 18, and the pressure in the compartment 19 in the airtight state is reduced to the refrigerant. Ascends to equal pressure. By detecting this increase in pressure by the pressure detection means 24 provided in the pressure detection conduit 23, the leakage of the refrigerant can be detected.

FIG. 6: is a principal part schematic perspective view which shows the 2nd example of embodiment of the cold water apparatus / hot water apparatus which concerns on this invention, or a steam generator figure.
This example, like the first example, is an example when the present invention is a chilled water device, and the chilled water device of the present example is the same as the first example except for the configuration of the cooling unit 3 as a main part. Only the main part is shown, and the others are used and the illustration is omitted.
The chilled water device of this example is a device that can cope with a particularly large amount of chilled water used, and the cooling unit 3 is constituted by a plurality of plate heat exchangers 4.
In this example, a plurality of plate type heat exchangers 4 of the chilled water device 1 of the first example are provided, and the plurality of plate type heat exchangers 4 are connected in parallel by a refrigerant pipe 25. The pressure detection conduits 23 provided in each plate heat exchanger 4 are also connected by a communication pipe 26 so as to communicate with each other, and a pressure detection means 24 is provided in the communication pipe 26.

According to the chilled water device of this example configured as described above, in the plurality of plate heat exchangers 4 serving as the cooling unit 3 provided in the water storage tank 2, the first joint that forms any one of the refrigerant flow paths 16. When the part 17 is damaged due to peeling or the like, the refrigerant leaks into the partition part 19 formed between the first joint line part 17 and the second joint line part 18, and the leaked refrigerant flows into the pressure detection conduit 23. To the communication pipe 26, and the pressure of the communication pipe 26 in an airtight state rises to make it equal to the refrigerant pressure. By detecting the increase in pressure by the pressure detection means 24 provided in the communication pipe 26, it is possible to detect the leakage of the refrigerant.
Thus, even if there is a refrigerant leak in any one of the plate heat exchangers 4 as a group of the plurality of plate heat exchangers 4, it can be reliably detected by one pressure detection means 24.
Moreover, although not shown in figure, as needed, you may make it provide several plate type heat exchanger 4 as 1 group, and this as multiple groups. In this case, one pressure detection means 24 is required for each group.

FIG. 7 is a main part schematic perspective view showing a third example of the embodiment of the cold water apparatus / hot water apparatus or the steam generator according to the present invention.
This example, like the first example, is an example when the present invention is a chilled water device, and the chilled water device of the present example is the same as the first example except for the configuration of the cooling unit 3 as a main part. Only the main part is shown, and the others are used and the illustration is omitted.
In the chilled water device of this example, a refrigerant leak detecting means 20 for detecting refrigerant leakage into the partition part 19 in the plate heat exchanger 4 serving as the cooling part 3 provided in the water storage tank 2 is provided in the partition part 19. The open conduit 27 communicates with the inside of the partition portion 19 and is opened to the atmosphere, and the temperature detecting means 28 provided in the open conduit 27. As the temperature detection means 28, a temperature sensor such as a thermocouple or a thermistor, a liquid expansion thermostat, or the like is used.
Others are the same as in the first example, and the same description as in the first example is used.

  According to the chilled water device of the present example configured as described above, in the plate heat exchanger 4 serving as the cooling unit 3 provided in the water storage tank 2, the first joint 17 that forms the refrigerant flow path 16 is peeled off or the like. When there is damage due to the refrigerant, the refrigerant leaks into the compartment 19 formed between the first joint line portion 17 and the second joint line portion 18, and communicates with the compartment portion 19 through the open conduit 27. Released into the atmosphere. At this time, the leakage of the refrigerant can be detected by detecting the temperature of the refrigerant when the temperature detecting means 28 provided in the open conduit 27 is discharged to the atmosphere through the open conduit 27.

FIG. 8 is a main part schematic perspective view showing a fourth example of the embodiment of the cold water device / hot water device or the steam generator according to the present invention.
This example, like the first example, is an example when the present invention is a chilled water device, and the chilled water device of the present example is the same as the first example except for the configuration of the cooling unit 3 as a main part. Only the main part is shown, and the others are used and the illustration is omitted.
Similar to the second example, the cold water device of this example is a device that can cope with a particularly large amount of cold water used, and the cooling unit 3 is constituted by a plurality of plate-type heat exchangers 4.
In this example, a plurality of plate type heat exchangers 4 of the chilled water device of the third example are provided, and the plurality of plate type heat exchangers 4 are connected in parallel by a refrigerant pipe 25. The open conduits 27 provided in the plate heat exchangers 4 are also connected to communicate with each other, and the open conduits 27 are provided with temperature detecting means 28.

According to the chilled water device of this example configured as described above, in the plurality of plate heat exchangers 4 serving as the cooling unit 3 provided in the water storage tank 2, the first joint that forms any one of the refrigerant flow paths 16. When the part 17 is damaged due to peeling or the like, the refrigerant leaks into the partition part 19 formed between the first joint line part 17 and the second joint line part 18 and communicates into the partition part 19 to be open. It is released into the atmosphere through a conduit 27. At this time, the leakage of the refrigerant can be detected by detecting the temperature of the refrigerant when the temperature detecting means 28 provided in the open conduit 27 is discharged to the atmosphere through the open conduit 27.
Thus, even if there is a refrigerant leak in any one of the plate type heat exchangers 4 as a group of the plurality of plate type heat exchangers 4, it can be reliably detected by one temperature detecting means 28.
Moreover, although not shown in figure, as needed, you may make it provide several plate type heat exchanger 4 as 1 group, and this as multiple groups. In this case, one temperature detection means 28 is required for each group.

FIG. 9 is a main part schematic perspective view showing a fifth example of the embodiment of the cold water device / hot water device or the steam generator according to the present invention.
This example, like the first example, is an example when the present invention is a chilled water device, and the chilled water device of the present example is the same as the first example except for the configuration of the cooling unit 3 as a main part. Only the main part is shown, and the others are used and the illustration is omitted.
In the chilled water device of this example, a refrigerant leak detecting means 20 for detecting refrigerant leakage into the partition part 19 in the plate heat exchanger 4 serving as the cooling part 3 provided in the water storage tank 2 is provided in the partition part 19. And an open conduit 27 communicating with the inside of the partition portion 19 and opened to the atmosphere, and a refrigerant sensor 29 provided in the open conduit 27.
Others are the same as in the first example, and the same description as in the first example is used.

  According to the chilled water device of the present example configured as described above, in the plate heat exchanger 4 serving as the cooling unit 3 provided in the water storage tank 2, the first joint 17 that forms the refrigerant flow path 16 is peeled off or the like. When there is damage due to the refrigerant, the refrigerant leaks into the compartment 19 formed between the first joint line portion 17 and the second joint line portion 18, and communicates with the compartment portion 19 through the open conduit 27. Released into the atmosphere. At this time, the refrigerant sensor 29 provided in the open conduit 27 detects the refrigerant released to the atmosphere through the open conduit 27, whereby the leakage of the refrigerant can be detected.

FIG. 10 is a main part schematic perspective view showing a sixth example of the embodiment of the cold water apparatus / hot water apparatus or the steam generator according to the present invention.
This example, like the first example, is an example when the present invention is a chilled water device, and the chilled water device of the present example is the same as the first example except for the configuration of the cooling unit 3 as a main part. Only the main part is shown, and the others are used and the illustration is omitted.
Similar to the second example, the cold water device of this example is a device that can cope with a particularly large amount of cold water used, and the cooling unit 3 is constituted by a plurality of plate-type heat exchangers 4.
In this example, a plurality of plate type heat exchangers 4 of the chilled water device of the third example are provided, and the plurality of plate type heat exchangers 4 are connected in parallel by a refrigerant pipe 25. An open conduit 27 provided in each plate type heat exchanger 4 is also connected so as to communicate with each other, and a refrigerant sensor 29 is provided in the open conduit 27.

According to the chilled water device of this example configured as described above, in the plurality of plate heat exchangers 4 serving as the cooling unit 3 provided in the water storage tank 2, the first joint that forms any one of the refrigerant flow paths 16. When the part 17 is damaged due to peeling or the like, the refrigerant leaks into the partition part 19 formed between the first joint line part 17 and the second joint line part 18 and communicates into the partition part 19 to be open. It is released into the atmosphere through a conduit 27. At this time, the refrigerant sensor 29 provided in the open conduit 27 detects the refrigerant released to the atmosphere through the open conduit 27, whereby the leakage of the refrigerant can be detected.
Thus, even if there is a refrigerant leak in any one of the plate-type heat exchangers 4 with a plurality of plate-type heat exchangers 4 as a group, the single refrigerant sensor 29 can reliably detect the leakage.
Moreover, although not shown in figure, as needed, you may make it provide several plate type heat exchanger 4 as 1 group, and this as multiple groups. In this case, one refrigerant sensor 29 is required for each group.

  In addition, although the 1st example thru | or the 6th example showed the Example in case all this invention is a cold water apparatus, even when this invention is a hot water apparatus or a steam generator, it is the 1st example thru | or a 6th example. A plate-type heat exchanger having the same configuration is provided. During operation of the hot water device or the steam generator, the plate-type heat exchanger has a damage such as peeling at the first joint forming the refrigerant flow path. Then, the refrigerant leakage can be detected in the same manner as in the first to sixth examples.

DESCRIPTION OF SYMBOLS 1 Cold water apparatus 2 Water storage tank 3 Cooling part 4 Plate type heat exchanger 5 Refrigerator 6 Refrigerant circulation path 6a Suction path 6b Discharge path 7 Expansion valve 8 Liquid electromagnetic valve 9 Water supply path 10 Water supply path 11 Water supply valve 12 Water supply pump 13 Water level control Tubes 14 and 15 Metal plate 16 Refrigerant flow path 17 First joint line 18 Second joint line 19 Partition 20 Refrigerant leak detection means 21 Refrigerant inflow pipe 22 Refrigerant outflow pipe 23 Pressure detection conduit 24 Pressure detection means 25 Refrigerant piping 26 Communication pipe 27 Open conduit 28 Temperature detection means 29 Refrigerant sensor 30 Drainage path 31 Drainage valve

Claims (7)

  A chilled water device, a hot water device or a steam generator provided with a plate-type heat exchanger serving as a cooling unit that joins two metal plates to form a refrigerant flow path. A first joint line portion that forms a path; a second joint line portion that surrounds the first joint line portion outside the first joint line portion; and a first joint line portion and a second joint line portion, A chilled water device / hot water device or a steam generator, characterized in that a refrigerant leakage detecting means for detecting refrigerant leakage into the compartment is provided in the compartment formed between the two.   The partition portion is formed in an airtight manner, and the refrigerant leak detection means measures a pressure detection conduit communicating with the partition portion provided in the partition portion and a pressure in the partition portion provided in the pressure detection conduit. The chilled water device / warm water device or the steam generator according to claim 1, further comprising pressure detecting means for performing   A plurality of plate type heat exchangers are prepared, the refrigerant flow paths of the plate type heat exchangers are connected in parallel, and the inside of the partition portion of each plate type heat exchanger communicates with each other by the pressure detection conduit. The chilled water device, the hot water device or the steam generator according to claim 2, wherein a communication pipe is provided, and the pressure detecting means for measuring the pressure in the partition is provided in the communication pipe. .   The refrigerant leakage detection means includes an open conduit that communicates with the compartment provided in the compartment and opens to the atmosphere, and a temperature detection means provided in the open conduit. The cold water apparatus / warm water apparatus or steam generator according to 1.   A plurality of the plate heat exchangers are prepared, the refrigerant flow paths of the plate heat exchangers are connected in parallel, and the inside of the partition part of the plate heat exchangers communicates with each other by the open conduit. The chilled water device / hot water device or steam generator according to claim 4, wherein the temperature detecting means is provided in the open conduit.   2. The refrigerant leakage detection means includes an open conduit that communicates with the compartment provided in the compartment and opens to the atmosphere, and a refrigerant sensor provided in the open conduit. The cold water apparatus / hot water apparatus or steam generator described in 1.   A plurality of the plate heat exchangers are prepared, the refrigerant flow paths of the plate heat exchangers are connected in parallel, and the inside of the partition part of the plate heat exchangers communicates with each other by the open conduit. The chilled water device / hot water device or steam generator according to claim 6, wherein the refrigerant sensor is provided in the open conduit.

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