JP6873988B2 - Refrigeration cycle equipment - Google Patents

Description

An embodiment of the present invention relates to a refrigeration cycle device in which a connecting end of a water pipe is projected outside the machine room.

For example, an air-cooled heat pump type chilling unit that produces cold or hot water has a first section having a machine room containing various refrigeration cycle components and a second section in which a plurality of air heat exchange units are arranged in a row. And have.

The second section is superposed on top of the first section. Each of the first section and the second section has an elongated shape extending in the depth direction of the chilling unit, and the total length along the longitudinal direction thereof is set to be substantially the same.

Therefore, both ends of the first section and the second section along the longitudinal direction are continuously erected along the height direction of the chilling unit, and one of them along the longitudinal direction of the first section. The connection end of the water pipe protrudes from the end.

Patent No. 5555701

In the conventional air-cooled heat pump type chilling unit, at the site where the chilling unit is delivered, it is possible to connect the connection end of the water pipe and the site pipe laid at the site using various valves and flexible joints. It is common.

However, since the connecting end of the water pipe projects out of the chilling unit from one end of the first section, it is undeniable that various valves and flexible joints project significantly around the chilling unit.

As a result, a distance of at least several hundred mm is required between the on-site piping and the chilling unit, which is one of the factors that increase the space for installing the chilling unit.

An object of the present invention is to obtain a refrigeration cycle apparatus that can reduce the space required for installation and can be installed reasonably even in a narrow space.

According to an embodiment, the refrigeration cycle apparatus has an elongated machine chamber in which a water circuit including a water pipe and a pump is housed, and the machine has a connecting end of the water pipe from one end along the longitudinal direction of the machine chamber. a first section which projects out of the chamber; and disposed on the first section, second section and extending along the longitudinal direction of the machine room; the machine is housed in the first section A plurality of first compressors arranged along the longitudinal direction of the chamber, housed in the first section, connected to the water circuit and arranged in a row of arrangements of the plurality of first compressors. With a first water heat exchanger and a first refrigeration cycle unit including a plurality of first air heat exchangers arranged in the second section and lined up along the longitudinal direction of the machine chamber; said first. A plurality of second compressors housed in one section and arranged along the longitudinal direction of the machine chamber, the water circuit housed in the first section and in series with the first water heat exchanger. A second water heat exchanger connected to and arranged in a row of arrangements of the plurality of second compressors, and the plurality of heat exchangers arranged in the second section along the longitudinal direction of the machine chamber. A row of arrangements of the plurality of second compressors and the second water heat exchanger includes a plurality of second air heat exchange portions arranged in a row in the same row as the arrangement of the first air heat exchange portions. A row of arrangements of the plurality of first compressors and the first water heat exchanger, and a second refrigeration cycle unit arranged in the width direction of the machine chamber orthogonal to the longitudinal direction of the machine chamber; It is formed on the side of at least one end of the first section along the longitudinal direction of the machine chamber and recessed from at least one end of the second section along the longitudinal direction of the machine chamber. A step portion under the second section that defines a space for the connecting end of the water pipe to enter; an end of the second section provided in the first section and overhanging the space. It is equipped with a vertical rail that supports the weight of the. It is located at one end of the second section of the plurality of first air heat exchange portions and the plurality of second air heat exchange portions arranged in a row along the longitudinal direction of the machine room. One air heat exchange section projects from the one end of the first section along the longitudinal direction of the machine room. The vertical rail is located at the center of the one air heat exchange section along the longitudinal direction of the machine room or on the side of the one end of the second section.

FIG. 1 is a perspective view of an air-cooled heat pump type chilling unit according to the first embodiment. FIG. 2 is a perspective view of the air-cooled heat pump type chilling unit according to the first embodiment, in which the machine room is open, as viewed from the left side. FIG. 3 is a perspective view of the air-cooled heat pump type chilling unit according to the first embodiment, in which the machine room is open, as viewed from the right side. FIG. 4 is a side view of the air-cooled heat pump type chilling unit according to the first embodiment. FIG. 5 is a circuit diagram showing a refrigeration cycle of the air-cooled heat pump type chilling unit according to the first embodiment. FIG. 6 is a plan view showing the positional relationship between the first refrigeration cycle unit, the second refrigeration cycle unit, the water circuit, and the electrical equipment unit housed in the machine room. FIG. 7 is a perspective view showing an exploded view of the air heat exchange unit used in the air-cooled heat pump type chilling unit according to the first embodiment. FIG. 8 is a perspective view showing the positional relationship between the machine room and the drain pan in the air-cooled heat pump type chilling unit according to the first embodiment. FIG. 9 is a cross-sectional view showing the positional relationship between the electrical unit, the drain pan, and the air heat exchange unit in the air-cooled heat pump type chilling unit according to the first embodiment. FIG. 10 is a side view of the air-cooled heat pump type chilling unit according to the second embodiment. FIG. 11 is a side view of the air-cooled heat pump type chilling unit according to the third embodiment.

[First Embodiment]
Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 9.

1 to 3 are perspective views of, for example, an air-cooled heat pump type chilling unit that produces cold water or hot water, FIG. 4 is a side view of the air-cooled heat pump type chilling unit, and FIG. 5 shows a refrigeration cycle of the air-cooled heat pump type chilling unit. It is a circuit diagram.

The air-cooled heat pump type chilling unit is an example of a refrigerating cycle device capable of operating in, for example, a cooling mode and a heating mode, and can be rephrased as an air-cooled heat pump type heat source machine. In the following description, the air-cooled heat pump type chilling unit is simply referred to as a chilling unit.

As shown in FIGS. 1 to 4, the chilling unit 1 includes a housing 2, a first refrigeration cycle unit 3, a second refrigeration cycle unit 4, a water circuit 5, and an electrical unit 6 as main elements. ..

The housing 2 is an example of the first section, and is installed on a horizontal installation surface G such as the roof of a building. The housing 2 is formed in the shape of an elongated hollow box whose depth dimension is much larger than the width dimension.

As shown in FIGS. 2 to 4, the housing 2 includes a main frame 7. The main frame 7 is composed of a lower frame 8, an upper frame 9, and a plurality of vertical rails 10. The lower frame 8 and the upper frame 9 have an elongated rectangular shape extending in the depth direction of the housing 2. The length L1 of the lower frame 8 along the depth direction of the housing 2 is shorter than the length L2 of the upper frame 9 along the depth direction of the housing 2. Further, the length L3 of the upper frame 9 along the width direction of the housing 2 is shorter than the length L4 of the lower frame 8 along the width direction of the housing 2.

The vertical rails 10 are elements that connect the lower frame 8 and the upper frame 9, and are arranged so as to be spaced apart from each other in the depth direction of the housing 2. The vertical rails 10 facing each other in the width direction of the housing 2 are inclined so as to approach each other in the direction from the lower frame 8 to the upper frame 9.

Therefore, as shown in FIGS. 2 and 3, when the housing 2 is viewed from the front direction F and the back direction R, the main frame 7 is directed from the lower frame 8 to the upper frame 9 of the housing 2. It is formed in a tapered shape so that the dimensions along the width direction gradually narrow.

The right side surface and the left side surface of the main frame 7 are each covered with a plurality of side plates 12. The front and back surfaces of the main frame 7 are each covered with end plates (not shown). Further, the bottom plate 13 is fixed on the lower frame 8. The bottom plate 13 defines a machine room 14 inside the housing 2 in cooperation with the side plate 12 and the end plate. The machine room 14 extends over the entire length along the depth direction of the housing 2.

According to the present embodiment, the front end of the lower frame 8 and the front end of the upper frame 9 located on the front side of the housing 2 are positioned along the depth direction of the housing 2 so as to be aligned in the height direction of the housing 2. Are aligned with each other. On the back side of the housing 2, the upper frame 8 projects horizontally toward the back of the housing 2 rather than the lower frame 7. Therefore, the total length of the housing 2 along the depth direction is defined by the length L1 of the lower frame 8. The depth direction of the housing 2 can be rephrased as the longitudinal direction of the housing 2.

As shown in FIGS. 5 and 6, the first refrigeration cycle unit 3 includes a first refrigerant circuit RA and a second refrigerant circuit RB that are independent of each other. Similarly, the second refrigeration cycle unit 4 includes a third refrigerant circuit RC and a fourth refrigerant circuit RD that are independent of each other.

Since the first to fourth refrigerant circuits RA, RB, RC, and RD have a common configuration with each other, the first refrigerant circuit RA will be described as a representative, and the second to fourth refrigerant circuits RB, RC, The same reference numerals are given to RDs, and the description thereof will be omitted.

The first refrigerant circuit RA mainly includes a variable capacity compressor 20, a four-way valve 21, an air heat exchange unit 22, a pair of expansion valves 23a and 23b, a receiver 24, a water heat exchanger 25, and a gas-liquid separator 26. It is prepared as an element. The plurality of elements are examples of refrigeration cycle components, and are connected via a circulation circuit 27 in which a refrigerant circulates.

Specifically, as shown in FIG. 5, the discharge port of the compressor 20 is connected to the first port 21a of the four-way valve 21. The second port 21b of the four-way valve 21 is connected to the air heat exchange unit 22. The air heat exchange unit 22 of the present embodiment includes a pair of air heat exchangers 29a and 29b and a fan 30.

As shown in FIG. 7, the air heat exchangers 29a and 29b are configured by combining a plurality of plate fins and a plurality of refrigerant pipes, and have a shape in which the horizontal cross section is bent into a substantially C shape. .. The air heat exchangers 29a and 29b stand so as to face each other with a gap in the width direction of the housing 2, and are inclined toward each other as they move upward. The gap between the edges of the air heat exchangers 29a and 29b is closed by a pair of shielding plates 32a and 32b. The tubular space surrounded by the air heat exchangers 29a and 29b and the shielding plates 32a and 32b defines the exhaust passage 33 extending in the vertical direction.

Therefore, as shown in FIGS. 2 and 3, when the housing 2 is viewed from the front direction F and the back direction R, the air heat exchange unit 22 of the housing 2 increases toward the upper side of the housing 2. It is formed in a V shape that expands in the width direction. Therefore, the chilling unit 1 in which the air heat exchange portion 22 is located on the housing 2 has a drum-shaped shape in which the intermediate portion along the height direction is constricted.

The fan 30 includes a fan motor 35 that rotates the impeller 34. The fan motor 35 has a built-in inverter board (not shown) for variably controlling the rotation speed of the impeller 34. The fan motor 35 is supported via a fan base 36 between the upper ends of the air heat exchangers 29a and 29b so as to be located at the upper end of the exhaust passage 33.

Further, the impeller 34 of the fan 30 is covered with a fan cover 37. The fan cover 37 has a cylindrical exhaust port 38 facing the impeller 34.

When the fan 30 is driven, the air around the chilling unit 1 passes through the air heat exchangers 29a and 29b and is sucked into the exhaust passage 33. The air sucked into the exhaust passage 33 is sucked up toward the exhaust port 38 and is discharged from the exhaust port 38 toward the upper side of the chilling unit 1.

As shown in FIG. 5, the inlets of the air heat exchangers 29a and 29b are connected in parallel to the second port 21b of the four-way valve 21. The outlets of the air heat exchangers 29a and 29b are connected to the third port 21c of the four-way valve 21 via the expansion valves 23a and 23b, the receiver 24 and the water heat exchanger 25. The fourth port 21d of the four-way valve 21 is connected to the suction side of the compressor 20 via the gas-liquid separator 26.

Further, the outlet of the gas-liquid separator 26 is connected to the first port 21a of the four-way valve 21 via the bypass pipe 40. A normally closed solenoid valve 41 is provided in the middle of the bypass pipe 40.

As shown in FIG. 5, the water heat exchanger 25 includes a first refrigerant flow path 25a, a second refrigerant flow path 25b, and a water flow path 25c. The first refrigerant flow path 25a of the water heat exchanger 25 is connected to the receiver 24 and the third port 21c of the four-way valve 21. The second refrigerant flow path 25b is connected to the receiver 24 of the second refrigerant circuit RB and the third port 21c of the four-way valve 21. Therefore, in the first refrigeration cycle unit 3, the first refrigerant circuit RA and the second refrigerant circuit RB share one water heat exchanger 25.

Similarly, in the second refrigeration cycle unit 4, the third refrigerant circuit RC and the fourth refrigerant circuit RD are connected in parallel to the one water heat exchanger 25 so as to share one water heat exchanger 25. Has been done. Therefore, the chilling unit 1 is equipped with two water heat exchangers 25.

Since the chilling unit 1 of the present embodiment has the first to fourth refrigerant circuits RA, RB, RC, and RD, there are four sets of air heat exchange units 22. The four sets of air heat exchange units 22 are fixed in an upright posture on the upper frame 9 of the main frame 7, and are arranged in a row along the depth direction of the housing 2. Therefore, in the present embodiment, four sets of air heat exchange units 22 located directly above the machine room 14 form a second section of the chilling unit 1.

Further, in the air heat exchange portion 22 located above the front end portion and the rear end portion along the depth direction of the housing 2, one of the bent ends of the air heat exchangers 29a and 29b is a housing. It is exposed in the front direction F of the body 2 and the back direction R of the housing 2. In other words, one end of the two sets of air heat exchangers 29a and 29b located at both ends along the arrangement direction of the plurality of air heat exchange portions 22 is a heat exchange surface exposed around the chilling unit 1. It has become.

By adopting this configuration, the air heat exchange portions 22 located above the front end portion and the rear end portion of the housing 2 are in addition to the air sucked from the width direction of the chilling unit 1, respectively, of the housing 2. Heat exchange can be performed using the air sucked from the front direction F and the back direction R.

As best shown in FIG. 4, the upper frame 9 of the main frame 7 projects more horizontally toward the back of the housing 2 than the lower frame 8. Of the four sets of air heat exchange units 22, the rearmost air heat exchange unit 22 located behind the housing 2 projects from the rear end of the housing 2 in the depth direction of the housing 2. In other words, the total length of the housing 2 along the depth direction is shorter than the total length of the four sets of air heat exchange portions 22 along the arrangement direction.

As a result, a stepped portion 43 recessed from the rearmost air heat exchange portion 22 is formed behind the housing 2 as the first section. The step portion 43 defines a space S1 that is continuously open to the side and the back of the housing 2, and the rearmost air heat exchange portion 22 projects above the space S1.

That is, the space S1 is located below the bent ends of the air heat exchangers 29a and 29b located on the rearmost side of the air heat exchanger 22. Here, as shown in FIG. 4, the vertical rail 10 arranged at the rear end portion of the housing 2 is centered along the depth direction of the air heat exchangers 29a and 29b constituting the rearmost air heat exchange portion 22. Alternatively, it is located on the back side of the housing 2 with respect to the center. As a result, the heavy air heat exchangers 29a and 29b can be stably supported by the main frame 7.

As shown in FIGS. 2 to 4 and 6, various elements of the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4 except for the four sets of air heat exchange units 22 are the housing 2. It is housed in the machine room 14.

The first refrigerating cycle unit 3 provided with the first refrigerant circuit RA and the second refrigerant circuit RB is, for example, the right half along the longitudinal direction of the machine room 14 when the housing 2 is viewed from the front F direction. It is located in the area. Similarly, the second refrigeration cycle unit 4 provided with the third refrigerant circuit RC and the fourth refrigerant circuit RD follows the longitudinal direction of the machine room 14, for example, when the housing 2 is viewed from the front F direction. It is located in the left half area.

Specifically, the two compressors 20, the two receivers 24, and the two gas-liquid separators 26 constituting the first refrigerant circuit RA and the second refrigerant circuit RB are on the right side of the machine room 14. In the half area, it is installed on the bottom plate 13 so as to line up in a row along the depth direction of the housing 2. Further, one water heat exchanger 25 shared by the first refrigerant circuit RA and the second refrigerant circuit RB is installed on the bottom plate 13 so as to be located at the rearmost part of the first refrigeration cycle unit 3. There is.

The two compressors 20, the two receivers 24, and the two gas-liquid separators 26 that make up the third refrigerant circuit RC and the fourth refrigerant circuit RD are housed in the left half region of the machine room 14. It is installed on the bottom plate 13 so as to line up in a row along the depth direction of the body 2. Further, one water heat exchanger 25 shared by the third refrigerant circuit RC and the fourth refrigerant circuit RD is installed on the bottom plate 13 so as to be located at the rearmost part of the second refrigeration cycle unit 4. There is.

Therefore, as best shown in FIG. 6, the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4 extend in the longitudinal direction of the housing 2 in the machine room 14, and the housing 2 They are lined up in the width direction. At the same time, the two water heat exchangers 25 are lined up in the width direction of the housing 2 at positions biased toward the stepped portion 43 with respect to the intermediate portion along the longitudinal direction of the housing 2.

As shown in FIGS. 2 to 6, the water circuit 5 is housed in the machine room 14 together with the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4. The water circuit 5 includes a water circulation pump 45 having a variable capacity and first to fourth water pipes 46a, 46b, 46c, 46d as main elements.

The water circulation pump 45 is installed on the bottom plate 13 so as to be located at the rear end of the machine room 14. Therefore, the water circulation pump 45 is located between the two water heat exchangers 25 arranged in the width direction of the housing 2 and the stepped portion 43 behind the housing 2.

The first water pipe 46a is connected to the suction port of the water circulation pump 45. The second water pipe 46b connects the discharge port of the water circulation pump 45 and the water flow path 25c of the water heat exchanger 25 corresponding to the first refrigeration cycle unit 3. The third water pipe 46c connects in series between the water flow path 25c of the water heat exchanger 25 of the first refrigeration cycle unit 3 and the water flow path 25c of the water heat exchanger 25 of the second refrigeration cycle unit 4. doing. The fourth water pipe 46d is connected to the water flow path 25c of the water heat exchanger 25 of the second refrigeration cycle unit 4.

According to this embodiment, the water circulation pump 45 of the water circuit 5 and the two water heat exchangers 25 are adjacent to each other at the rear of the machine room 14. Therefore, the first to fourth water pipes 46a, 46b, 46c, 46d of the water circuit 5 are concentrated at the rear end of the machine room 14, and the first to fourth water pipes 46a, 46b, 46c, 46d are pipes. The length becomes shorter.

As a result, the workability when installing the first to fourth water pipes 46a, 46b, 46c, 46d in the machine room 14 is improved, and the workability of the first to fourth water pipes 46a, 46b, 46c, 46d is improved. Maintenance can be performed easily.

As shown in FIGS. 4 and 6, the first water pipe 46a has a first connection end 48. The first connection end 48 includes, for example, a water pipe inlet 49 formed at the upstream end of the first water pipe 46a and a strainer 50 connected to the water pipe inlet 49. The first connection end 48 projects from the rear end of the machine room 14 toward the step 43 behind the housing 2.

The fourth water pipe 46d has a second connection end 51. The second connection end 51 includes, for example, a water pipe outlet 52 formed at the downstream end of the fourth water pipe 46d, and a check valve 53 connected to the water pipe outlet 52. The second connection end 51 projects from the rear end of the machine room 14 toward the step 43 behind the housing 2.

Therefore, the first connection end portion 48 and the second connection end portion 51 of the water circuit 5 are contained in the space S1 defined by the step portion 43. Therefore, most of the first connection end 48 and the second connection end 51, even though the first connection end 48 and the second connection end 51 project behind the machine room 14. Is located directly below the rearmost air heat exchange section 22.

Further, as shown in FIG. 4, the first connection end 48 of the first water pipe 46a is placed on the installation surface G via accessories (not shown) such as various valves and flexible joints. It is connected to the first on-site pipe 55 laid in. The first on-site pipe 55 is connected to a water outlet on the side of a utilization device such as an air conditioner.

The second connection end 51 of the fourth water pipe 46d is a second field pipe laid on the installation surface G via accessories (not shown) such as various valves and flexible joints. It is connected to 56. The second on-site pipe 56 is connected to a water inlet on the side of a utilization device such as an air conditioner.

As shown in FIGS. 8 and 9, a drain pan 60 that receives dew condensation water or the like dripping from the air heat exchangers 29a and 29b is arranged between the machine room 14 of the housing 2 and the four sets of air heat exchange units 22. ing. The drain pan 60 of the present embodiment includes a pair of gutters 61a and 61b and a drain recovery board 62.

The troughs 61a and 61b are elements that extend straight along the arrangement direction of the four sets of air heat exchange units 22 so as to be located directly below the air heat exchangers 29a and 29b of each air heat exchange unit 22. It is supported by the upper frame 9 of the housing 2.

The gutters 61a and 61b are arranged in parallel with each other in the width direction of the housing 2. The bottoms of the gutters 61a and 61b are inclined downward from the front to the back of the housing 2. Further, a ventilation passage 63 is formed between the gutters 61a and 61b. The ventilation passage 63 extends along the depth direction of the housing 2, and the machine room 14 and the exhaust passages 33 of the four sets of air heat exchange units 22 are communicated with each other through the ventilation passage 63.

The drain recovery board 62 is supported by the upper frame 9 so as to straddle between the rear ends of the gutters 61a and 61b. The rear end portion of the drain recovery board 62 projects above the stepped portion 43 behind the housing 2. Further, the drain recovery board 62 has a drain pipe connection port 64 opened in the step portion 43.

As shown in FIGS. 4, 6 and 8, the electrical unit 6 is located at the front end of the machine room 14 on the front side of the housing 2. The electrical unit 6 of the present embodiment includes an electrical box 70 and a fan device 71. The electrical box 70 has a main box 72, a first side box 73a, and a second side box 73b.

As shown in FIGS. 8 and 9, the main box 72 is a substantially rectangular parallelepiped element and has a height dimension equivalent to that of the machine room 14. The main box 72 is fixed on the bottom plate 13 of the machine room 14. The left and right side surfaces of the main box 72 are separated from the side plates 12 of the housing 2 as they approach the bottom plate 13.

The first side box 73a and the second side box 73b are box-shaped elements having a height dimension smaller than that of the main box 72, and have an elongated shape extending in the depth direction of the housing 2.

The first side box 73a projects from the lower part of the left side surface of the main box 72 toward the left side of the main box 72. The second side box 73b projects from the lower part of the right side surface of the main box 72 toward the right side of the main box 72. The first side box 73a and the second side box 73b are fixed on the bottom plate 13 of the machine room 14, respectively.

According to the present embodiment, the housing 2 is formed in a tapered shape from the lower frame 8 to the upper frame 9, so that the length of the machine room 14 along the width direction of the housing 2 is as shown in FIG. The dimensions are expanded from the upper part to the lower part of the machine room 14. Therefore, the first side box 73a and the second side box 73b are housed in the lower part of the machine room 14 having the expanded width.

By adopting this configuration, the front end portion of the machine room 14 can be effectively utilized in every corner as a storage space for the electrical box 70. Therefore, it is possible to sufficiently secure the internal volume of the electrical box 70 while suppressing the length of the electrical box 70 along the depth direction of the housing 2.

According to this embodiment, an air passage 74 as shown in FIG. 9 is formed inside the main box 72. The air passage 74 is formed between a pair of partition plates 75a and 75b that partition the inside of the main box 72. The air passage 74 extends in the depth direction of the housing 2 at the central portion along the width direction of the main box 72, and stands up along the height direction of the main box 72.

The lower end of the air passage 74 is opened at the bottom of the main box 72 and leads to an air intake hole 76 opened in the bottom plate 13 of the housing 2. The intake hole 76 communicates with the gap g between the bottom plate 13 and the installation surface G. The upper end of the air passage 74 is opened on the upper surface of the main box 72.

The electrical box 70 houses various electric components that control the operation of the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4. Examples of electrical components include multiple control boards that control the voltage and frequency applied to the compressor 20, multiple power modules such as inverters and converters, multiple smoothing capacitors, multiple reactors for power factor improvement, and multiple reactors. A filter board, multiple terminal blocks and multiple electromagnetic contactors.

Among various electric components, for example, a plurality of control boards and a plurality of power modules can be rephrased as heat generating components 78 having a large amount of heat generated during operation. Since the heat generating component 78 requires positive heat dissipation, it is thermally connected to a plurality of heat sinks 79. The heat sink 79 penetrates the partition plates 75a and 75b and is exposed to the air passage 74.

As shown in FIGS. 6, 8 and 9, the fan device 71 of the electrical unit 6 is mounted on the upper surface of the main box 72. The fan device 71 includes an elongated box-shaped fan case 81, and a plurality of electric fans 82a, 82b, 82c housed in the fan case 81.

The fan case 81 extends in the depth direction of the housing 2 so as to surround the upper end of the air passage 74 at the central portion of the upper surface of the main box 72. Further, the fan case 81 projects upward from the upper surface of the main box 72. According to the present embodiment, the upper end portion of the fan case 81 enters the exhaust passage 33 between the air heat exchangers 29a and 29b through the gutters 61a and 61b of the drain pan 60.

The electric fans 82a, 82b, 82c are lined up in a row with an interval in the depth direction of the housing 2. The electric fans 82a, 82b, and 82c are incorporated in the fan case 81 in a horizontal posture with the rotation axis vertically arranged so as to be located directly above the air passage 74. The electric fans 82a, 82b, and 82c are all exhausted toward the upper side of the fan case 81.

When the electric fans 82a, 82b, 82c operate, a negative pressure acts on the air passage 74 of the main box 72. As a result, as shown by an arrow in FIG. 9, the air around the housing 2 is sucked into the air passage 74 through the intake hole 76 through the gap g. The sucked air flows through the air passage 74 from the bottom to the top and is guided to the fan case 81.

The air flowing through the air passage 74 comes into contact with the heat sink 79 that receives the heat of the heat generating component 78. As a result, the heat of the heat generating component 78 transmitted to the heat sink 79 is released by multiplying the air flow, and the heat generating component 78 is forcibly cooled.

The air that has passed through the air passage 74 is sucked up by the electric fans 82a, 82b, 82c, and is exhausted between the upper end of the fan case 81 and the air heat exchangers 29a, 29b, as shown by the white arrows in FIG. It is discharged directly to the passage 33.

The air discharged to the exhaust passage 33 is sucked up toward the exhaust port 38 together with the air passing through the air heat exchangers 29a and 29b by the operation of the fan 30, and is discharged above the chilling unit 1 from the exhaust port 38. .. Therefore, the air after cooling the heat generating component 78 of the electrical unit 6 does not stay in the machine room 14.

Specifically, the air outside the chilling unit 1, that is, the outside air is guided from the intake hole 76 to the air passage 74 in the main box 72 where the heat sink 79 is exposed. Since the outside air contains dust and moisture, if the outside air that has passed through the air passage 74 is discharged to the machine room 14, it is undeniable that dust will be accumulated in the machine room 14 at an early stage.

On the other hand, in the present embodiment, the fan case 81 accommodating the electric fans 82a, 82b, 82c is projected into the exhaust passage 33 between the air heat exchangers 29a, 29b through the gutters 61a, 61b of the drain pan 60. There is. Therefore, the outside air that has passed through the air passage 74 is discharged to the outside of the chilling unit 1 from the exhaust port 38 of the air heat exchange unit 22 without passing through the machine room 14.

Therefore, it is possible to prevent dust contained in the air from accumulating in the machine room 14 and adhering to the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4.

Further, according to the present embodiment, the machine room 14 in the housing 2 is inside the four sets of air heat exchange portions 22 through the ventilation passage 63 between the pair of gutters 61a and 61b extending in the depth direction of the housing 2. It leads to the exhaust passage 33 of. Therefore, the air in the machine room 14 can be forcibly sucked up from the air passage 63 toward the exhaust passage 33 by using the fan 30 of the air heat exchange unit 22. Therefore, the air permeability of the machine room 14 is remarkably improved, and it becomes difficult for heat to be trapped in the machine room 14.

In addition, since the fan device 71 on the main box 72 enters between the gutters 61a and 61b of the drain pan 60, the ventilation passage 63 generated between the gutters 61a and 61b can be used as the installation space for the fan device 71. As a result, the upper surface of the main box 72 can be brought as close as possible to the gutters 61a and 61b, and the height of the main box 72 can be secured while suppressing the height dimension of the machine room 14.

Moreover, by increasing the height dimension of the main box 72, it is possible to suppress the length of the main box 72 along the depth direction of the housing 2 while securing the internal volume of the main box 72. Therefore, the occupied area of the main box 72 in the machine room 14 can be reduced, which is convenient for shortening the total length of the housing 2 as the first section along the depth direction.

Next, the operation of the chilling unit 1 will be described.

When the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4 start operation in the cooling mode, the four-way valves 21 of the first to fourth refrigerant circuits RA, RB, RC, and RD are shown in solid lines in FIG. As shown, the first port 21a communicates with the second port 21b, and the third port 21c communicates with the fourth port 21d.

Further, the high-temperature and high-pressure vapor-phase refrigerant is discharged from the compressor 20 of the first to fourth refrigerant circuits RA, RB, RC, and RD to the circulation circuit 27. The high-temperature, high-pressure vapor-phase refrigerant discharged from the compressor 20 is guided to the air heat exchangers 29a and 29b via the four-way valve 21.

The gas-phase refrigerant guided to the air heat exchangers 29a and 29b is condensed by heat exchange with the air passing through the air heat exchangers 29a and 29b by the operation of the fan 30, and is changed to a high-pressure liquid-phase refrigerant. The high-pressure liquid-phase refrigerant is depressurized in the process of passing through the expansion valves 23a and 23b, and changes to an intermediate-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant is guided to the water heat exchanger 25 via the receiver 24.

In the present embodiment, the first refrigerant circuit RA and the second refrigerant circuit RB share one water heat exchanger 25, and the third refrigerant circuit RC and the fourth refrigerant circuit RD share another water heat. The exchanger 25 is shared. Therefore, in the first refrigerant circuit RA and the second refrigerant circuit RB, a gas-liquid two-phase refrigerant having an intermediate pressure is applied to the first refrigerant flow path 25a and the second refrigerant flow path 25b of the water heat exchanger 25, respectively. It is guided and exchanges heat with the water flowing through the water flow path 25c.

As a result, the gas-liquid two-phase refrigerant flowing through the first refrigerant flow path 25a and the second refrigerant flow path 25b evaporates to receive heat from the water in the water flow path 25c, and the low-temperature and low-pressure gas-liquid by the latent heat of vaporization. It changes to a two-phase refrigerant. The water in the water channel 25c becomes cold water by being deprived of latent heat.

In the water flow path 25c of the water heat exchanger 25 shared by the first refrigerant circuit RA and the second refrigerant circuit RB, the third refrigerant circuit RC and the fourth refrigerant circuit RD pass through the third water pipe 46c. It is connected in series to the water flow path 25c of another shared water heat exchanger 25.

Therefore, the water cooled by the water heat exchanger 25 shared by the first refrigerant circuit RA and the second refrigerant circuit RB is the other water shared by the third refrigerant circuit RC and the fourth refrigerant circuit RD. In the process of passing through the water flow path 25c of the heat exchanger 25, the heat is exchanged again with the gas-liquid two-phase refrigerant flowing through the first refrigerant flow path 25a and the second refrigerant flow path 25b of the other water heat exchanger 25. Be chilled. The water cooled in the two stages is supplied from the fourth water pipe 46d to the utilization equipment side via the second on-site pipe 56.

The low-temperature and low-pressure gas-liquid two-phase refrigerant that has passed through each water heat exchanger 25 is guided to the gas-liquid separator 26 via the four-way valve 21, where the liquid-phase refrigerant and the gas-phase refrigerant are separated. .. The gas phase refrigerant separated from the liquid phase refrigerant is sucked into the compressor 20 and again becomes a high temperature / high pressure gas phase refrigerant and is discharged from the compressor 20 to the circulation circuit 27.

On the other hand, when the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4 start operation in the heating mode, the four-way valves 21 of the first to fourth refrigerant circuits RA, RB, RC, and RD are shown in FIG. As shown by the broken line, the first port 21a communicates with the third port 21c, and the second port 21b communicates with the fourth port 21d.

In the heating mode, the high-temperature, high-pressure vapor-phase refrigerant compressed by the compressor 20 is guided to the water heat exchanger 25 via the four-way valve 21. Even in the heating mode, the water flow path 25c of one water heat exchanger 25 shared by the first refrigerant circuit RA and the second refrigerant circuit RB is shared by the third refrigerant circuit RC and the fourth refrigerant circuit RD. Since the water flow path 25c of the other water heat exchanger 25 is connected in series, the water flowing through the water flow path 25c is a gas phase flowing through the first refrigerant flow path 25a and the second refrigerant flow path 25b. It is heated in two stages by heat exchange with the refrigerant. The water heated by receiving the heat of the vapor phase refrigerant is supplied from the fourth water pipe 46d to the utilization equipment side via the second on-site pipe 56.

The high-pressure liquid-phase refrigerant that has passed through the water heat exchanger 25 changes to an intermediate-pressure gas-liquid two-phase refrigerant in the process of passing through the receiver 24 and the expansion valves 23a and 23b, and is guided to the air heat exchangers 29a and 29b. Be taken. The gas-liquid two-phase refrigerant guided to the air heat exchangers 29a and 29b evaporates by heat exchange with the air passing through the air heat exchangers 29a and 29b by the operation of the fan 30, and the low-temperature and low-pressure gas-liquid two-phase It changes to a refrigerant.

The low-temperature and low-pressure gas-liquid two-phase refrigerant that has passed through the air heat exchangers 29a and 29b is guided to the gas-liquid separator 26 via the four-way valve 21, where the liquid-phase refrigerant and the gas-phase refrigerant are separated. To. The gas phase refrigerant separated from the liquid phase refrigerant is sucked into the compressor 20 and again becomes a high temperature / high pressure gas phase refrigerant and is discharged from the compressor 20 to the circulation circuit 27.

According to the chilling unit 1 of the first embodiment, the first connection end 48 and the second connection end 51 of the water circuit 5 are stepped portions from the machine room 14 of the housing 2 to the back of the housing 2, respectively. It is projected toward 43. The step portion 43 is formed by making the length of the housing 2 as the first section shorter than the length of the four sets of air heat exchange portions 22 as the second section, and is formed at the rear end of the second section. It defines a space S1 recessed from one air heat exchange unit 22 located in.

Therefore, although the first connection end 48 and the second connection end 51 of the water circuit 5 project behind the machine room 14, the first connection end 48 and the second connection end 48 The 51 fits in the space S1 of the step portion 43 without protruding significantly behind the chilling unit 1.

Therefore, when installing the chilling unit 1 on the installation surface G on which the first and second site pipes 55 and 56 are laid, the chilling unit 1 can be brought close to the first and second site pipes 55 and 56. It becomes.

As a result, the space required for the installation of the chilling unit 1 can be reduced, and the installation work of the chilling unit 1 can be carried out reasonably even in a narrow space.

Further, according to the first embodiment, the upper end portion of the main box 72 housed in the machine room 14 is projected into the exhaust passage 33 inside the air heat exchange portion 22 through between the pair of gutters 61a and 61b. The length dimension of the main box 72 along the depth direction of the housing 2 can be shortened while securing the internal volume of the main box 72. As a result, the occupied area of the main box 72 with respect to the machine room 14 is shortened in the depth direction of the housing 2, which effectively contributes to shortening the length dimension of the housing 2 along the depth direction.

At the same time, in the first embodiment, an inverter board for controlling the rotation speed of the impeller 34 of the fan 30 is built in the fan motor 35. As a result, it is not necessary to secure a space for accommodating the inverter board inside the electrical box 70, and the length of the electrical box 70 can be suppressed.

Therefore, the length of the housing 2 as the first section can be sufficiently shorter than the length of the air heat exchange unit 22 as the second section, and the water circuit 5 is located behind the housing 2. A stepped portion 43 having a space S1 for accommodating the first connecting end portion 48 and the second connecting end portion 51 can be easily obtained.

[Second Embodiment]
FIG. 10 discloses a second embodiment.

The second embodiment discloses a pumpless specification chilling unit 100. In the pumpless specification chilling unit 100, the water circulation pump 45 is excluded from the water circuit 5, and the configuration of the chilling unit 100 other than that is basically the same as that of the first embodiment. Therefore, in the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 10, according to the pumpless specification chilling unit 100, an empty space is created at the rear end of the machine room 14 in which the water circulation pump is housed, so that the empty space is the first connection end of the water circuit 5. A portion 51 and a second connecting end portion 55 are housed. Therefore, in the present embodiment, the first site pipe 55 is inserted into the step portion 43 behind the housing 2, and the second site pipe 56 is closer to the step portion 43 than in the first embodiment. There is.

According to the second embodiment, the space S1 defined by the step portion 43 can be used to route the first on-site pipe 55. In other words, the housing 2 of the chilling unit 100 is moved into the first site pipe 55 and the second site until the first site pipe 55 enters the step portion 43 and the second site pipe 56 approaches the step portion 43. It can be moved to the side of the pipe 56.

Therefore, the space for installing the chilling unit 1 can be further reduced.

[Third Embodiment]
FIG. 11 discloses a third embodiment.

According to the chilling unit 200 according to the third embodiment, the first step portion 201 is formed behind the housing 2 as the first section, and the second step portion 202 is formed on the front side of the housing 2. ing.

The first step portion 201 has a space S2 that is continuously opened toward the side and the back of the housing 2, and the first connection end portion 48 and the second connection end portion 48 of the water pipe 5 and the second step portion 201 are provided in the space S2. The connection end 51 is located. Similarly, the second step portion 202 has a space S3 that is continuously opened toward the side and the front of the housing 2, and an optional component 203 such as a piping kit is located in the space S3. There is.

According to the third embodiment, the second step portion 202 located on the front side of the housing 2 can be utilized as a space for arranging the optional component 203, and the periphery of the housing 2 can be effectively used.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

2 ... 1st section (housing), 14 ... Machine room, 20, 21, 23a, 23b, 24, 25, 26 ... Refrigeration cycle components (compressor, four-way valve, expansion valve, receiver, water heat exchanger) , Gas-liquid separator), 22 ... 2nd section (air heat exchange part), 43,201,202 ... Step part (1st step part, 2nd step part), 46a, 46b, 46c, 46d ... Water pipes (first to fourth water pipes), 48, 51 ... connection ends (first connection end, second connection end), 60 ... drain pan.

Claims (5)

An elongated machine room the water circuit including the water pipe and the pump are housed, a first section which projects out of the machine room from one end to the connection end of the water pipe along the longitudinal direction of the machine room ,
A second section placed on top of the first section and extending along the longitudinal direction of the machine room,
A plurality of first compressors housed in the first section and arranged along the longitudinal direction of the machine room, and the plurality of first compressors housed in the first section and connected to the water circuit. Includes a first water heat exchanger arranged in a row of compressor arrangements and a plurality of first air heat exchangers arranged in the second section and lined up along the longitudinal direction of the machine room. The first refrigeration cycle unit and
A plurality of second compressors housed in the first section and arranged along the longitudinal direction of the machine chamber, said in series with the first water heat exchanger housed in the first section. A second water heat exchanger connected to a water circuit and arranged in a row of the plurality of second compressor arrangements, and said in the second section along the longitudinal direction of the machine chamber. In the arrangement of the plurality of second compressors and the second water heat exchanger, which includes a plurality of second air heat exchange units arranged in a row in the same row as the arrangement of the plurality of first air heat exchange units. A row of arrangements of the plurality of first compressors and the first water heat exchanger and a second refrigeration cycle unit arranged in the width direction of the machine chamber orthogonal to the longitudinal direction of the machine chamber. ,
On the side of at least one end along the longitudinal direction of the machine room of the first section, it is formed in the machine room retracted state than at least one end along the longitudinal direction of the second section , A stepped portion that defines a space under the second section for the connection end of the water pipe to enter .
A vertical rail provided in the first section and supporting the weight of the end portion of the second section overhanging the space .
With
Among the second air heat exchanger section longitudinally aligned in a row along the plurality of first air heat exchanger and of said plurality of said machine room, located at the one end of the second section one air heat exchanger is protruded along the longitudinal direction of the machine room from the one end of the first section,
Frozen the vertical bar is characterized in that located on the side of the one end of the second section than in the center or the center along the longitudinal direction of the machine room of the one air heat exchanger Cycle device. Wherein the connection end of the water pipe, the refrigeration cycle apparatus of claim 1 including the connected check valve in the outlet of the connected strainer and the water pipe to the inlet of the water pipe. The refrigeration cycle apparatus according to claim 1, further comprising an on-site pipe connected to the connection end portion of the water pipe, and the on-site pipe has entered the step portion. Wherein the first side of the other end along the longitudinal direction of the machine room of the section, wherein the machine room other stepped portion recessed than the other end portion along the longitudinal direction of the second section is formed The refrigeration cycle apparatus according to claim 1, wherein the optional parts are arranged in the other stepped portion. The first water heat exchanger and the second water heat exchanger, the refrigeration cycle apparatus according to the parallel department claim 1 in the width direction of the machine room at a position adjacent to the stepped portion.

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