JPWO2017216926A1 - Refrigeration cycle equipment - Google Patents

Abstract

A space required for installation can be reduced, and a refrigeration cycle apparatus that can be installed comfortably even in a small space is obtained.
The refrigeration cycle apparatus has an elongated machine room 14 in which water pipes (46a, 46b, 46c, 46d) are accommodated, and the connection ends (48, 51) of the water pipes are in the longitudinal direction of the machine room (14). A first section (2) projecting out of the machine room from one end along the line, and a second section (22) disposed on the first section and extending along the first section. ing. The first section has a shorter overall length along the longitudinal direction than the second section, and at least one end along the longitudinal direction of the first section is at least along the longitudinal direction of the second section. A stepped portion (43) that is recessed from one end is formed. The connection end of the water pipe is located at the step.

Description

  Embodiments of the present invention relate to a refrigeration cycle apparatus in which a connecting end portion of a water pipe protrudes outside a machine room.

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

  The second section is disposed 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 entire length along the longitudinal direction is set to be substantially the same.

  For this reason, both end portions along the longitudinal direction of the first section and the second section are continuously raised along the height direction of the chilling unit, and one end portion along the longitudinal direction of the first section The connecting end of the water pipe protrudes from the end.

Japanese Patent No. 5555701

  In the conventional air-cooled heat pump chilling unit, at the site where the chilling unit is delivered, the connection end of the water piping and the site piping laid on the site can be connected using various valves and flexible joints. It is common.

  However, since the connection end portion of the water pipe protrudes from the one end portion of the first section to the outside of the chilling unit, it cannot be denied that various valves and flexible joints protrude greatly 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 factor that increases 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 without difficulty even in a narrow space.

According to the embodiment, the refrigeration cycle apparatus has an elongated machine room in which a water pipe is accommodated, and a connection end of the water pipe is projected from one end along the longitudinal direction of the machine room to the outside of the machine room. A first section and a second section disposed on the first section and extending along the first section.
The first section is formed to have a shorter overall length along the longitudinal direction than the second section, and at least one end portion along the longitudinal direction of the first section has a longitudinal length of the second section. A stepped portion that is recessed from at least one end along the direction is formed. The connection end portion of the water pipe is located at the step portion.

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

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

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

  The air-cooled heat pump chilling unit is an example of a refrigeration cycle apparatus that can be operated in a cooling mode and a heating mode, for example, and can be rephrased as an air-cooled heat pump heat source machine. In the following description, the air-cooled heat pump 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 | casing 2 is an example of a 1st section, Comprising: For example, it is installed on the horizontal installation surface G like the rooftop of a building. The casing 2 is formed in an elongated hollow box shape 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 includes a lower frame 8, an upper frame 9 and a plurality of vertical bars 10. The lower frame 8 and the upper frame 9 are elongated rectangular shapes 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 at intervals in the depth direction of the housing 2. The vertical rails 10 facing the width direction of the housing 2 are inclined so as to approach each other as they proceed from the lower frame 8 to the upper frame 9.

  For this reason, 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 moves from the lower frame 8 toward the upper frame 9. It is formed in a tapered shape such that the dimension along the width direction is gradually narrowed.

  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 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 positioned 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 beyond the lower frame 7 toward the back of the housing 2. For this reason, the total length along the depth direction of the housing 2 is defined by the length L <b> 1 of the lower frame 8. The depth direction of the housing 2 can be restated 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, the first refrigerant circuit RA will be described as a representative, and the second to fourth refrigerant circuits RB, RC, RD, About RD, the same referential mark is attached | subjected and the description is abbreviate | omitted.

  The first refrigerant circuit RA mainly includes a variable capacity compressor 20, a four-way valve 21, an air heat exchanger 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 the refrigerant circulates.

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

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

  For this reason, as shown in FIGS. 2 and 3, the air heat exchanging unit 22 is configured such that when the casing 2 is viewed from the front direction F and the rear direction R, the casing 2 It is formed in a V shape that expands in the width direction. Therefore, the chilling unit 1 in which the air heat exchanging part 22 is positioned on the housing 2 has a drum-shaped shape in which an intermediate part along the height direction is constricted.

  The fan 30 includes a fan motor 35 that rotates the impeller 34. The fan motor 35 incorporates an inverter board (not shown) for variably controlling the rotational speed of the impeller 34. The fan motor 35 is supported via the fan base 36 between the upper ends of the air heat exchangers 29a and 29b so as to be positioned 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 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 29 a and 29 b are connected in parallel to the second port 21 b 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 21 d of the four-way valve 21 is connected to the suction side of the compressor 20 via a gas-liquid separator 26.

  Further, the outlet of the gas-liquid separator 26 is connected to the first port 21 a 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 channel 25a, a second refrigerant channel 25b, and a water channel 25c. The first refrigerant flow path 25 a of the water heat exchanger 25 is connected to the receiver 24 and the third port 21 c 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 one water heat exchanger 25 so as to share one water heat exchanger 25. Has been. Therefore, the chilling unit 1 is equipped with two water heat exchangers 25.

  Since the chilling unit 1 of the present embodiment includes the first to fourth refrigerant circuits RA, RB, RC, and RD, there are four sets of air heat exchange units 22. The four 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 line along the depth direction of the housing 2. Therefore, in the present embodiment, the four sets of air heat exchanging units 22 positioned immediately above the machine room 14 constitute the second section of the chilling unit 1.

  Furthermore, in the air heat exchanger 22 positioned on the front end and the rear end along the depth direction of the housing 2, the bent one ends of the air heat exchangers 29a and 29b are respectively housings. The body 2 is exposed in the front direction F 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 positioned at both ends along the arrangement direction of the plurality of air heat exchange units 22 is a heat exchange surface exposed around the chilling unit 1. It has become.

  By adopting this configuration, the air heat exchanging unit 22 positioned on the front end portion and the rear end portion of the housing 2 is in addition to the air sucked from the width direction of the chilling unit 1, respectively. 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 horizontally toward the back of the housing 2 rather than the lower frame 8. Of the four sets of air heat exchanging units 22, the rearmost air heat exchanging 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 along the depth direction of the housing 2 is shorter than the total length along the alignment direction of the four air heat exchange units 22.

  As a result, a stepped portion 43 is formed behind the housing 2 as the first section, which is recessed from the rearmost air heat exchanging portion 22. The stepped 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 exchanging portion 22 projects over the space S1.

  That is, the space S <b> 1 is located below the bent end portions of the air heat exchangers 29 a and 29 b located on the most back side of the air heat exchange unit 22. Here, as shown in FIG. 4, the vertical rail 10 disposed at the rear end of the housing 2 is a center along the depth direction of the air heat exchangers 29 a and 29 b constituting the rearmost air heat exchanger 22. Or it is located in the back side of case 2 rather than the center. Thereby, the air heat exchangers 29a and 29b, which are heavy objects, can be stably supported by the main frame 7.

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

  The first refrigeration cycle unit 3 provided with the first refrigerant circuit RA and the second refrigerant circuit RB has, for example, the right half along the longitudinal direction of the machine room 14 when the casing 2 is viewed from the front F direction. Arranged in the area. Similarly, the second refrigeration cycle unit 4 including the third refrigerant circuit RC and the fourth refrigerant circuit RD is along the longitudinal direction of the machine room 14 when the housing 2 is viewed from the front F direction, for example. It is arranged 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 arranged on the right side of the machine room 14. In the half area, it is installed on the bottom plate 13 so as to be arranged in a line along the depth direction of the housing 2. Furthermore, 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. Yes.

  The two compressors 20, the two receivers 24, and the two gas-liquid separators 26 constituting the third refrigerant circuit RC and the fourth refrigerant circuit RD are arranged in the left half region of the machine room 14. It is installed on the bottom plate 13 so as to be arranged in a line along the depth direction of the body 2. Furthermore, 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. Yes.

  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 casing 2 in the machine room 14, and It is lined up in the width direction. At the same time, the two water heat exchangers 25 are arranged in the width direction of the housing 2 at a position that is biased toward the stepped portion 43 rather than an 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 variable capacity type water circulation pump 45 and first to fourth water pipes 46a, 46b, 46c, and 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 46 a is connected to the suction port of the water circulation pump 45. The second water pipe 46 b connects between the discharge port of the water circulation pump 45 and the water flow path 25 c of the water heat exchanger 25 corresponding to the first refrigeration cycle unit 3. The third water pipe 46 c connects in series between the water flow path 25 c of the water heat exchanger 25 of the first refrigeration cycle unit 3 and the water flow path 25 c of the water heat exchanger 25 of the second refrigeration cycle unit 4. doing. The fourth water pipe 46 d is connected to the water flow path 25 c of the water heat exchanger 25 of the second refrigeration cycle unit 4.

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

  This improves the workability when the first to fourth water pipes 46a, 46b, 46c, 46d are installed in the machine room 14, and the first to fourth water pipes 46a, 46b, 46c, 46d. Maintenance can be performed easily.

  As shown in FIGS. 4 and 6, the first water pipe 46 a 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 46 a and a strainer 50 connected to the water pipe inlet 49. The first connection end portion 48 projects from the rear end portion of the machine room 14 toward the stepped portion 43 behind the housing 2.

  The fourth water pipe 46 d 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 46 d and a check valve 53 connected to the water pipe outlet 52. The second connection end portion 51 protrudes from the rear end portion of the machine room 14 toward the stepped portion 43 behind the housing 2.

  Therefore, the first connection end 48 and the second connection end 51 of the water circuit 5 are contained in the space S <b> 1 defined by the stepped portion 43. Therefore, most of the first connection end 48 and the second connection end 51 are in spite of the fact that the first connection end 48 and the second connection end 51 protrude behind the machine room 14. Is positioned directly below the rearmost air heat exchanger 22.

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

  The second connection end 51 of the fourth water pipe 46d is, for example, a second field pipe laid on the installation surface G via accessories (not shown) such as various valves and flexible joints. 56. The 2nd site piping 56 is connected to the water inlet by the side of utilization equipment like an air conditioner, for example.

  As shown in FIGS. 8 and 9, a drain pan 60 that receives condensed water or the like dripping from the air heat exchangers 29 a and 29 b is disposed between the machine chamber 14 of the housing 2 and the four air heat exchange units 22. ing. The drain pan 60 of the present embodiment includes a pair of ridges 61 a and 61 b and a drain collection board 62.

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

  The flanges 61 a and 61 b are arranged in parallel with a space in the width direction of the housing 2. The bottoms of the flanges 61a and 61b are inclined downward as they proceed from the front of the housing 2 toward the back. Further, a ventilation path 63 is formed between the flanges 61a and 61b. The ventilation path 63 extends along the depth direction of the housing 2, and the machine chamber 14 and the exhaust passages 33 of the four air heat exchange units 22 communicate with each other through the ventilation path 63.

  The drain collection board 62 is supported by the upper frame 9 so as to straddle between the rear ends of the flanges 61a and 61b. The rear end portion of the drain collecting board 62 protrudes above the stepped portion 43 behind the housing 2. Further, the drain collection board 62 has a drain pipe connection port 64 opened to 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 this embodiment includes an electrical box 70 and a fan device 71. The electrical box 70 includes 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 plate 12 of the housing 2 as approaching the bottom plate 13.

  The first side box 73 a and the second side box 73 b 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 73 a protrudes 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 73 b protrudes 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 casing 2 is tapered from the lower frame 8 toward the upper frame 9, so that the length of the machine room 14 along the width direction of the casing 2 is shown in FIG. The width of the machine room 14 is expanded from the upper part to the lower part. Therefore, the first side box 73a and the second side box 73b are housed in the lower part of the machine room 14 whose width is expanded.

  By adopting this configuration, the front end portion of the machine room 14 can be effectively utilized to every corner as an accommodation space for the electrical box 70. Therefore, the internal volume of the electrical equipment box 70 can be sufficiently secured while suppressing the length of the electrical equipment box 70 along the depth direction of the housing 2.

  According to the present embodiment, an air passage 74 as shown in FIG. 9 is formed in the main box 72. The air passage 74 is formed between a pair of partition plates 75 a and 75 b that partition the inside of the main box 72. The air passage 74 extends in the depth direction of the housing 2 at the center portion along the width direction of the main box 72 and is erected 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 communicates with an intake hole 76 opened in the bottom plate 13 of the housing 2. The intake hole 76 communicates with a 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 accommodates various electrical components that control the operation of the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4. An example of the electrical component includes a plurality of control boards that control the voltage and frequency applied to the compressor 20, a plurality of power modules such as inverters and converters, a plurality of smoothing capacitors, a plurality of reactors for power factor improvement, a plurality of reactors, and the like. A filter substrate, a plurality of terminal blocks and a plurality of electromagnetic contactors;

  Among various electrical components, for example, a plurality of control boards and a plurality of power modules can be rephrased as heat-generating components 78 that generate a large amount of heat during operation. Since the heat generating component 78 requires active 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 attached to 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 82 a, 82 b, 82 c accommodated 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 center of the upper surface of the main box 72. Further, the fan case 81 protrudes 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 gaps 61a and 61b of the drain pan 60.

  The electric fans 82a, 82b, 82c are arranged in a line at intervals 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 set vertically so as to be positioned right above the air passage 74. The electric fans 82a, 82b, and 82c all exhaust toward the upper side of the fan case 81.

  When the electric fans 82a, 82b, 82c operate, negative pressure acts on the air passage 74 of the main box 72. As a result, as shown by arrows in FIG. 9, the air around the housing 2 is sucked into the air passage 74 through the air intake hole 76 from 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 contacts 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, and 82c, and exhausted between the air heat exchangers 29a and 29b from the upper end of the fan case 81 as shown by the white arrows in FIG. It is discharged directly into the passage 33.

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

  More specifically, air outside the chilling unit 1, that is, 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 into the machine chamber 14, it cannot be denied that dust accumulates in the machine chamber 14 at an early stage.

  On the other hand, in the present embodiment, the fan case 81 that houses the electric fans 82a, 82b, and 82c is protruded into the exhaust passage 33 between the air heat exchangers 29a and 29b through the gaps 61a and 61b of the drain pan 60. Yes. Therefore, the outside air that has passed through the air passage 74 is discharged out 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, dust contained in the air can be prevented from accumulating in the machine room 14 and adhering to the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4.

  Furthermore, according to the present embodiment, the machine room 14 in the housing 2 is located inside the four air heat exchange units 22 through the ventilation path 63 between the pair of flanges 61 a and 61 b extending in the depth direction of the housing 2. To the exhaust passage 33. For this reason, the air in the machine chamber 14 can be forcibly sucked 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 heat is hardly generated in the machine room 14.

  In addition, since the fan device 71 on the main box 72 enters between the flanges 61 a and 61 b of the drain pan 60, the ventilation path 63 generated between the flanges 61 a and 61 b can be used as an installation space for the fan device 71. As a result, the upper surface of the main box 72 can be made as close as possible to the flanges 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, the length of the main box 72 along the depth direction of the housing 2 can be suppressed while securing the internal volume of the main box 72. Therefore, the occupation area of the main box 72 in the machine room 14 can be reduced, which is convenient for shortening the total length along the depth direction of the casing 2 as the first section.

  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, RD are shown by solid lines in FIG. As shown, the first port 21a is switched to communicate with the second port 21b, and the third port 21c is switched to communicate with the fourth port 21d.

  Further, high-temperature and high-pressure gas-phase refrigerant is discharged to the circulation circuit 27 from the compressors 20 of the first to fourth refrigerant circuits RA, RB, RC, and RD. The high-temperature and high-pressure gas-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 into 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 one other water heat. The exchanger 25 is shared. For this reason, in the first refrigerant circuit RA and the second refrigerant circuit RB, a gas-liquid two-phase refrigerant having an intermediate pressure is supplied to the first refrigerant channel 25a and the second refrigerant channel 25b of the water heat exchanger 25, respectively. It is guided and exchanges heat with water flowing through the water flow path 25c.

  As a result, the gas-liquid two-phase refrigerant flowing in the first refrigerant flow path 25a and the second refrigerant flow path 25b evaporates and receives heat from the water in the water flow path 25c, and the low-temperature and low-pressure gas-liquid is generated by latent heat of evaporation. Change to two-phase refrigerant. The water in the water flow path 25c becomes cold water by removing latent heat.

  The water flow path 25c of the water heat exchanger 25 shared by the first refrigerant circuit RA and the second refrigerant circuit RB is connected to the third refrigerant circuit RC and the fourth refrigerant circuit RD via the third water pipe 46c. The other water heat exchanger 25 to be shared is connected in series to the water flow path 25c.

  Therefore, the water cooled in 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, heat exchange 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 again occurs. Chilled. The water cooled in two stages is supplied from the fourth water pipe 46d to the utilization device 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 it is separated into a liquid-phase refrigerant and a gas-phase refrigerant. . 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, RD are shown in FIG. As indicated by a broken line, the first port 21a is switched to communicate with the third port 21c, and the second port 21b is switched to communicate with the fourth port 21d.

  In the heating mode, the high-temperature and high-pressure gas-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, and the third refrigerant circuit RC and the fourth refrigerant circuit RD are shared. Since the water flow path 25c of the other one water heat exchanger 25 is connected in series, the water flowing through the water flow path 25c is the 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 gas-phase refrigerant is supplied from the fourth water pipe 46d to the utilization device side through the second on-site pipe 56.

  The high-pressure liquid-phase refrigerant that has passed through the water heat exchanger 25 is changed 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 also introduced into the air heat exchangers 29a and 29b. It is burned. 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 refrigerant Change to 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 it is separated into a liquid-phase refrigerant and a gas-phase refrigerant. The 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 respectively stepped from the machine chamber 14 of the housing 2 to the back of the housing 2. It protrudes toward 43. The step portion 43 is formed by making the length of the casing 2 as the first section shorter than the length of the four sets of air heat exchange portions 22 as the second section, and the rear end of the second section. The space S1 which is retracted from one air heat exchanging part 22 located in is defined.

  Therefore, although the first connection end 48 and the second connection end 51 of the water circuit 5 protrude behind the machine room 14, the first connection end 48 and the second connection end 51 fits in the space S <b> 1 of the stepped portion 43 without projecting greatly behind the chilling unit 1.

  Therefore, when the chilling unit 1 is installed 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 installation of the chilling unit 1 can be reduced, and the installation operation of the chilling unit 1 can be performed without difficulty even in a small space.

  Furthermore, according to the first embodiment, the upper end portion of the main box 72 accommodated in the machine room 14 is protruded into the exhaust passage 33 inside the air heat exchanging portion 22 through the pair of flanges 61a and 61b. The length 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 area occupied by 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 along the depth direction of the housing 2.

  In addition, in the first embodiment, an inverter board that controls the rotational 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 housing the inverter board in the electrical box 70, and the length of the electrical box 70 can be suppressed.

  Therefore, the length of the casing 2 as the first section can be made sufficiently shorter than the length of the air heat exchanging portion 22 as the second section, and the water circuit 5 is placed behind the casing 2. A step 43 having a space S1 for accommodating the first connection end 48 and the second connection end 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 chilling unit 100 of the pumpless specification, 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 denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 10, according to the chilling unit 100 of the pumpless specification, an empty space is generated at the rear end portion of the machine room 14 in which the water circulation pump is accommodated, so that the first connection end of the water circuit 5 is formed in the empty space. The part 51 and the second connection end 55 are accommodated. Therefore, in the present embodiment, the first site piping 55 enters the stepped portion 43 behind the housing 2, and the second site piping 56 approaches the stepped portion 43 as compared to the first embodiment. Yes.

  According to the second embodiment, the first on-site piping 55 can be routed using the space S <b> 1 defined by the stepped portion 43. In other words, the housing 2 of the chilling unit 100 is connected to the first site piping 55 and the second site until the first site piping 55 enters the stepped portion 43 and the second site piping 56 approaches the stepped portion 43. It can be brought closer to the pipe 56 side.

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

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

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents 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 ... second section (air heat exchange part), 43, 201, 202 ... step part (first step part, second step part), 46a, 46b, 46c, 46d ... Water piping (first to fourth water piping), 48, 51... Connection end (first connection end, second connection end), 60.

Claims (11)

A first section in which a water pipe is accommodated in an elongated machine room, and a connection end of the water pipe projects from the one end along the longitudinal direction of the machine room to the outside of the machine room;
A second section disposed on the first section and extending along the first section;
The first section is formed to have a shorter overall length along the longitudinal direction than the second section, and at least one end portion along the longitudinal direction of the first section has a longitudinal length of the second section. A refrigeration cycle apparatus in which a stepped portion that is recessed from at least one end along the direction is formed, and the connection end of the water pipe is positioned at the stepped portion.   2. The refrigeration cycle apparatus according to claim 1, wherein the stepped portion has a space opened around the first section under the second section.   The second section has a plurality of air heat exchange sections arranged in a line along the longitudinal direction of the first section, and is located at the one end of the second section. An air heat exchanging portion projects from the one end of the first section along the longitudinal direction of the first section, and the stepped portion is positioned under the one air heat exchanging portion. The refrigeration cycle apparatus according to claim 1 or 2.   The refrigeration cycle apparatus according to claim 3, wherein the connection end portion of the water pipe enters under the one air heat exchange portion of the second section.   The refrigeration cycle apparatus according to any one of claims 1 to 4, wherein the connection end of the water pipe includes a strainer connected to a water pipe inlet and a check valve connected to a water pipe outlet.   The refrigeration cycle apparatus according to claim 1, further comprising an on-site pipe connected to the connection end of the water pipe, wherein the on-site pipe enters the stepped portion.   On the side of the other end portion along the longitudinal direction of the first section, another stepped portion is formed which is recessed from the other end portion along the longitudinal direction of the second section. The refrigeration cycle apparatus according to claim 1, wherein optional parts are arranged.   The apparatus further includes a plurality of water heat exchangers housed in the machine room, the water heat exchangers being connected in series via the water pipe, and at a position adjacent to the stepped part. The refrigeration cycle apparatus according to claim 1, wherein the refrigeration cycle apparatuses are arranged in a width direction of the machine room orthogonal to the longitudinal direction. A housing in which a plurality of refrigeration cycle components including a water pipe are accommodated, and a housing in which a connection end of the water pipe protrudes outside the machine room;
A plurality of air heat exchange units arranged in a row on the housing, and
The casing has a shape shorter than the air heat exchange portions arranged in a row, and one air located at the end of the air heat exchange portions in which the connection end portions of the water pipes are arranged in a row A refrigeration cycle apparatus located under the heat exchange unit.   10. The refrigeration cycle apparatus according to claim 9, wherein the connection end portion of the water pipe protrudes from the machine room so as to be along an arrangement direction of the air heat exchanger. An elongated first section having a machine room in which a water pipe is housed;
A second section disposed on the first section and having a plurality of air heat exchangers disposed along a longitudinal direction of the first section;
A drain pan provided between the first section and the second section so as to be positioned below the air heat exchanger and having a plurality of elements extending in a longitudinal direction of the first section; A refrigeration cycle apparatus provided.

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