JP2016200333A - Refrigeration cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigeration cycle device which enables an electric fan corresponding to a control part of an operating refrigerant circuit to be selectively driven to improve the power-saving effect and prevents dust from depositing in the control parts.SOLUTION: A refrigeration cycle device includes: independent refrigerant circuits; and an electric unit 6 including control parts 80 which individually control the refrigerant circuits. The electric unit has housing chambers 68, 69 for housing the control parts, and each housing chamber is provided with at least one electric fan 101 which cools the control part according to an operation status of the refrigerant circuit.SELECTED DRAWING: Figure 12

Description

  Embodiments described herein relate generally to a refrigeration cycle apparatus having a plurality of independent refrigerant circuits.

  A chilling unit equipped with a plurality of independent refrigerant circuits includes a plurality of control units that individually control the plurality of refrigerant circuits. Each control unit has an electrical component that generates a large amount of heat, such as an inverter circuit, a power module, and a reactor, and the electrical component is housed in one electrical box.

  Furthermore, in the conventional chilling unit, the electric box is provided with a plurality of electric fans. The electric fan is an element that forcibly cools the controller that generates heat, and even if one refrigerant circuit stops operating, all electric fans remain active as long as other refrigerant circuits continue to operate. It is designed to be driven continuously.

JP, 2014-178113, A

  According to the conventional chilling unit, even if some of the refrigerant circuits stop operating, the electric fan corresponding to the control unit that does not require cooling continues to be driven. For this reason, power consumption cannot be suppressed, and there is room for improvement in promoting energy saving.

  Furthermore, since all the electric fans continue to be driven regardless of the operation state of the refrigerant circuit, excessive air is sucked into the electrical box. As a result, it is inevitable that dust contained in the air stays in the electrical box or adheres to the control unit at an early stage, which becomes one factor that causes malfunction or breakage of the control unit.

  It is an object of the present invention to selectively drive an electric fan corresponding to a control unit of an operating refrigerant circuit, to enhance power saving effect and to prevent accumulation of dust on the control unit. To obtain a cycle device.

  According to the embodiment, the refrigeration cycle apparatus includes a plurality of refrigerant circuits and an electrical unit including a plurality of control units that individually control the refrigerant circuits. The electrical unit includes a plurality of storage chambers that store the control unit, and at least one electric fan that cools the control unit according to an operation state of the refrigerant circuit is provided in each of the storage chambers.

It is a perspective view of the air-cooling type heat pump chilling unit which concerns on embodiment. In the air cooling type heat pump chilling unit which concerns on embodiment, it is the perspective view which looked at the state which opened the machine room from the left side. In the air cooling type heat pump chilling unit which concerns on embodiment, it is the perspective view which looked at the state which opened the machine room from the right side. It is a circuit diagram which shows the refrigerating cycle of the air-cooling type heat pump chilling unit which concerns on embodiment. In the air-cooling type heat pump chilling unit which concerns on embodiment, it is a top view which shows the positional relationship of the 1st refrigeration cycle unit accommodated in the machine room, the 2nd refrigeration cycle unit, a water circuit, and an electrical equipment unit. In the air-cooling type heat pump chilling unit which concerns on embodiment, it is a perspective view which decomposes | disassembles and shows the positional relationship of a machine room and a drain pan. It is a perspective view which decomposes | disassembles and shows the air heat exchanger part used for the air-cooling type heat pump chilling unit which concerns on embodiment. It is the perspective view which looked at the electrical equipment unit used for the air-cooling type heat pump chilling unit which concerns on embodiment from the left side. It is the perspective view which looked at the electrical equipment unit used for the air-cooling type heat pump chilling unit which concerns on embodiment from the right side. It is a top view of the electrical equipment unit which removed the fan case. It is sectional drawing of the electrical equipment unit which shows the flow path of the air in a 1st storage chamber. It is a perspective view of the electrical equipment unit which shows the flow path of the air in a 1st storage chamber and a 2nd storage chamber. It is a side view of the electrical equipment unit which shows the flow path of the air in a 1st storage chamber and a 2nd storage chamber. In the air-cooling type heat pump chilling unit which concerns on embodiment, it is sectional drawing which shows the positional relationship of an electrical equipment unit, a drain pan, and an air heat exchanger part. It is a side view which shows roughly the layout of the several electrical component arrange | positioned in the 1st area | region of a 1st storage chamber. It is a side view which shows roughly the layout of the some electrical component arrange | positioned at the 2nd area | region of a 1st storage chamber. It is a block diagram which shows the control system of a 1st refrigeration cycle unit and a 2nd refrigeration cycle unit. It is a perspective view of the 1st relay unit used for the air-cooling type heat pump chilling unit concerning an embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

  1 to 3 are perspective views of an air-cooled heat pump chilling unit 1 that generates, for example, cold water or hot water, and FIG. 4 is a circuit diagram illustrating a refrigeration cycle of the air-cooled heat pump chilling unit 1. The air-cooled heat pump chilling unit 1 is an example of a refrigeration cycle apparatus, and can be operated in a cooling mode and a heating mode.

  As shown in FIGS. 1 to 3, an air-cooled heat pump chilling unit 1 includes a housing 2, a first refrigeration cycle unit 3 having a refrigerant circuit, a second refrigeration cycle unit 4 having a refrigerant circuit, a water circuit 5, and The electrical unit 6 is provided as a main element. In the following description, the air-cooled heat pump chilling unit 1 is simply referred to as a chilling unit 1.

  The housing 2 is an element that is installed on a horizontal installation surface G such as the roof of a building, for example, and is formed in a hollow box shape in which the depth dimension D is much larger than the width dimension W. The housing 2 of this embodiment includes a frame 7. The frame 7 includes a lower structure 8, an upper structure 9, and a plurality of vertical bars 10.

  The lower structure 8 and the upper structure 9 are each formed in an elongated frame shape extending in the depth direction of the housing 2. The lower structure 8 has a pair of long sides 8 a and 8 b along the depth direction of the housing 2 and a pair of short sides 8 c and 8 d along the width direction of the housing 2.

  Similarly, the upper structure 9 has a pair of long sides 9 a and 9 b along the depth direction of the housing 2 and a pair of short sides 9 c and 9 d along the width direction of the housing 2. The length dimension of the lower structure 8 along the depth direction of the housing 2 and the length dimension of the upper structure 9 are the same, but the length dimension of the upper structure 9 along the width direction of the housing 2 is the same. It is shorter than the length dimension of the lower structure 8.

  The vertical rails 10 are arranged at intervals so as to connect the lower structure 8 and the upper structure 9. 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 structure 8 to the upper structure 9.

  For this reason, when the housing 2 is viewed from the front direction F and the back direction R, the frame 7 is formed in a tapered shape such that the width dimension W gradually decreases from the lower structure 8 toward the upper structure 9. ing.

  The right side surface and the left side surface of the frame 7 are covered with a plurality of side plates 12. The front surface of the frame 7 is covered with a first end plate 13a. The back surface of the frame 7 is covered with a second end plate 13b. The side plate 12, the first end plate 13a, and the second end plate 13b are detachably supported by the frame 7.

  The bottom plate 14 shown in FIGS. 5 and 6 is fixed to the lower structure 8 by means such as welding or bolting. The bottom plate 14 cooperates with the side plate 12, the first end plate 13 a, and the second end plate 13 b to define a machine room 15 inside the housing 2. The machine room 15 extends over the entire length along the depth direction of the housing 2.

  As shown in FIGS. 4 and 5, the first refrigeration cycle unit 3 includes a first refrigerant circuit RA and a second refrigerant circuit RB that are independent of each other. 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 includes a variable capacity compressor 20, a four-way valve 21, an air heat exchanger section 22, a pair of expansion valves 23a and 23b, a receiver 24, a water heat exchanger 25, and a gas-liquid separator 26. It has as a main element. The plurality of elements are connected via a circulation circuit 27 in which the refrigerant circulates.

  Specifically, as shown in FIG. 4, the discharge port of the compressor 20 is connected to the first port 21 a of the four-way valve 21 via the discharge pipe 28. The discharge pipe 28 includes a first pressure sensor P1 that detects the pressure of the high-temperature and high-pressure gas-phase refrigerant discharged from the compressor 20, and a first temperature sensor T1 that detects the temperature of the high-temperature and high-pressure gas-phase refrigerant. Is provided.

  The second port 21 b of the four-way valve 21 is connected to the air heat exchanger unit 22. The air heat exchanger section 22 of this 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 supported in an upright posture on the base plate 31. The air heat exchangers 29a and 29b face each other with a gap in the width direction of the housing 2, and are inclined in a direction 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 space surrounded by the shielding plates 32a and 32b and the air heat exchangers 29a and 29b constitutes an exhaust passage 33 extending in the vertical direction.

  The fan 30 is supported via the fan base 35 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 fan 30 is covered with a top plate 36. The top plate 36 has a cylindrical exhaust port 37 that faces the fan 30.

  In such an air heat exchanger section 22, when the fan 30 is driven, outside air passes through the air heat exchangers 29 a and 29 b and is sucked into the exhaust passage 33. The outside air sucked into the exhaust passage 33 is sucked up toward the exhaust port 37 and is discharged from the exhaust port 37 to above the air heat exchanger section 22.

  Since the chilling unit 1 of the present embodiment includes the first to fourth refrigerant circuits RA, RB, RC, and RD, there are four air heat exchanger sections 22. The four air heat exchanger units 22 are fixed in a standing posture on the upper structure 9 of the housing 2 and are arranged in a line along the depth direction of the housing 2.

  Drain pans 39 that receive condensed water and the like are disposed below the four air heat exchanger units 22. As shown in FIGS. 6 and 14, the drain pan 39 is interposed between the long sides 9 a and 9 b of the upper structure 9 so as to be positioned at the upper end of the machine room 15. The drain pan 39 extends over the entire length of the housing 2 along the depth direction. A gap 40 is provided between each side edge of the drain pan 39 along the depth direction and the long sides 9 a and 9 b of the upper structure 9. The gap 40 communicates with the machine chamber 15 and the exhaust passage 33 of the air heat exchanger section 22.

  As shown in FIG. 4, 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. In the vicinity of the inlets of the air heat exchangers 29a and 29b, a second temperature sensor T2 for detecting the temperature of the gas-phase refrigerant flowing into the air heat exchangers 29a and 29b is provided.

  The outlets of the air heat exchangers 29a and 29b are connected to pipes 41a and 41b having expansion valves 23a and 23b. The pipes 41a and 41b are joined together downstream of the expansion valves 23a and 23b, and are connected to a single collective pipe 42. The collective pipe 42 is connected to the third port 21 c of the four-way valve 21 via 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. The pipe 43 connecting the fourth port 21d of the four-way valve 21 and the inlet of the gas-liquid separator 26 is provided with a third temperature sensor T3 that detects the temperature of the gas-liquid two-phase refrigerant guided to the gas-liquid separator 26. It has been.

  Further, the pipe 44 connecting the outlet of the gas-liquid separator 26 and the suction side of the compressor 20 is provided with a second pressure sensor P2 for detecting the pressure of the low-temperature and low-pressure gas-phase refrigerant sucked into the compressor 20. It has been.

  A bypass pipe 46 is provided between the gas-liquid separator 26 and the four-way valve 21. The bypass pipe 46 connects the outlet of the gas-liquid separator 26 and the first port 21 a of the four-way valve 21, and a normally closed electromagnetic valve 47 is provided in the middle of the bypass pipe 46.

  According to this embodiment, 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 collective piping 42 of the first refrigerant circuit RA downstream from the receiver 24. The second refrigerant flow path 25b of the water heat exchanger 25 is connected to the collective piping 42 of the second refrigerant circuit RB having the same configuration as that of the first refrigerant circuit RA. 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 includes two water heat exchangers 25.

  Of the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4, various elements other than the four air heat exchanger units 22 are accommodated in the machine room 15 of the housing 2. Specifically, as shown in FIGS. 2, 3, and 5, the first refrigeration cycle unit 3 including the first refrigerant circuit RA and the second refrigerant circuit RB is provided on the back surface of the housing 2. It is arrange | positioned at the rear-end part of the machine room 15 which is the side.

  The two compressors 20 of the first refrigerant circuit RA and the second refrigerant circuit RB are installed on the bottom plate 14 so as to be aligned in the depth direction of the housing 2. The two receivers 24 and the two gas-liquid separators 26 of the first refrigerant circuit RA and the second refrigerant circuit RB are arranged on the bottom plate 14 so as to be aligned in the depth direction of the casing 2 around the compressor 20. It is installed above. 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 14 so as to be adjacent to the two receivers 24.

  The second refrigeration cycle unit 4 configured by the third refrigerant circuit RC and the fourth refrigerant circuit RD is disposed at the center of the machine room 15 along the depth direction. The two compressors 20 of the third refrigerant circuit RC and the fourth refrigerant circuit RD, the two receivers 24, the two gas-liquid separators 26, the third refrigerant circuit RC and the fourth refrigerant circuit RD are provided. One shared water heat exchanger 25 is installed on the bottom plate 14 in the same layout as the compressor 20, the receiver 24, the gas-liquid separator 26, and the water heat exchanger 25 of the first refrigeration cycle unit 3. Yes.

  For this reason, the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4 are arranged in the depth direction of the housing 2 in the machine room 15. At the same time, the routing path of the circulation circuit 27 of the first refrigeration cycle unit 3 and the routing path of the circulation circuit 27 of the second refrigeration cycle unit 4 in the machine room 15 are made common.

  As shown in FIGS. 2 and 5, the water circuit 5 is housed in the machine room 15 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 50 and first to fourth water pipes 51a, 51b, 51c, 51d as main elements.

  The water circulation pump 50 is installed on the bottom plate 14 so as to be located at the rear end of the machine room 15, and is adjacent to the water heat exchanger 25 of the first refrigeration cycle unit 3. The 1st water piping 51a has connected between the water outlet by the side of utilization apparatuses, such as an air conditioner, and the suction inlet of the water circulation pump 50, for example.

  The second water pipe 51 b connects between the discharge port of the water circulation pump 50 and the water flow path 25 c of the water heat exchanger 25 of the first refrigeration cycle unit 3. The second water pipe 51b is provided with a third pressure sensor P3 for detecting the water pressure and a fourth temperature sensor T4 for detecting the water temperature.

  The third water pipe 51 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 third water pipe 51c is provided with a fifth temperature sensor T5 for detecting the water temperature.

  The fourth water pipe 51d connects between the water flow path 25c of the water heat exchanger 25 of the second refrigeration cycle unit 4 and the water inlet on the use device side. The fourth water pipe 51d is provided with a fourth pressure sensor P4 for detecting the water pressure and a sixth temperature sensor T6 for detecting the water temperature.

  As shown in FIGS. 2, 3, and 5, the electrical unit 6 is installed on the bottom plate 14 so as to be located at the front end of the machine room 15 on the front side of the housing 2. The electrical unit 6 is adjacent to the second refrigeration cycle unit 4 in the machine room 15. For this reason, the first refrigeration cycle unit 3, the second refrigeration cycle unit 4, and the electrical unit 6 are arranged in a line along the depth direction of the machine room 15.

  As shown in FIGS. 8 to 13, the electrical unit 6 according to this embodiment includes an electrical box 60 and a control box 61. The electrical box 60 is a square box-shaped element, and includes a bottom plate 62, left and right side plates 63 a and 63 b, a front plate 64, and a back plate 65. The bottom plate 62 is fixed on the bottom plate 14 of the housing 2 by means such as bolting.

  The interior of the electrical box 60 is partitioned into two chambers, a first storage chamber 68 and a second storage chamber 69, by a pair of first partition plates 66a and 66b. The first partition plates 66a and 66b extend in the width direction of the housing 2 between the side plates 63a and 63b, and face each other with a space therebetween. Therefore, the first storage chamber 68 and the second storage chamber 69 are arranged in the depth direction of the housing 2.

  In other words, the first storage chamber 68 is positioned on the front side of the housing 2 in the machine chamber 15, and the second storage chamber 69 is positioned on the second refrigeration cycle unit 4 side in the machine chamber 15. ing.

  As shown in FIGS. 10 and 11, the first storage chamber 68 is partitioned into a first region 68a and a second region 68b by a pair of second partition plates 70a and 70b. The second partition plates 70 a and 70 b are erected from the bottom plate 62 of the electrical equipment box 60 at the center of the first storage chamber 68 and extend in the depth direction of the housing 2. Therefore, the first region 68a and the second region 68b are arranged in the width direction of the housing 2 with the second partition plates 70a and 70b interposed therebetween.

  The second partition plates 70a and 70b are arranged in parallel with a space between each other. A first ventilation path 71 is formed between the second partition plates 70a and 70b. The first ventilation path 71 extends in the height direction of the electrical box 60. The lower end of the first ventilation path 71 communicates with an introduction hole 72 opened in the bottom plate 62.

  As shown in FIG. 14, the introduction hole 72 is communicated with a ventilation passage 73 between the bottom plate 14 and the installation surface G through a communication hole 14 a opened in the bottom plate 14 of the housing 2. The long sides 8a and 8b of the lower structure 8 of the housing 2 face each other with the ventilation passage 73 therebetween. A plurality of slit-like outside air inlets 74 are formed at positions corresponding to the electrical unit 6 in the long sides 8a and 8b of the lower structure 8 respectively. The outside air introduction port 74 is opened to the outside of the chilling unit 1 and communicates with the upstream end of the first ventilation path 71 through the ventilation passage 73, the communication hole 14 a and the introduction hole 72.

  Further, the side plate 63a and the first partition plate 66a of the electrical equipment box 60 that define the first region 68a and the second region 68b are formed with a plurality of vent holes 75 each opened in the machine chamber 15. Yes.

  Similarly, the second storage chamber 69 is also divided into a first region 69a and a second region 69b. The first region 69 a and the second region 69 b are arranged in the width direction of the housing 2. A second ventilation path 76 is formed between the first area 69a and the second area 69b. The second ventilation path 76 extends in the height direction of the electrical equipment box 60 in the same manner as the first ventilation path 71 and communicates with the outside air introduction port 74 through the ventilation passage 73.

  Further, a plurality of vent holes 77 opened in the machine room 15 are formed in the side plate 63a and the back plate 64 of the electrical box 60 defining the first region 69a and the second region 69b.

  As shown in FIGS. 11 to 13, a first control unit 80 that controls the operation of the first refrigeration cycle unit 3 is housed in the first housing chamber 68. The second storage chamber 69 stores a second control unit 81 that controls the operation of the second refrigeration cycle unit 4.

  Each of the first control unit 80 and the second control unit 81 is an example of a control unit, and has a common configuration. Therefore, in the present embodiment, the first control unit 80 will be described as a representative, the second control unit 81 will be denoted by the same reference numeral, and the description thereof will be omitted.

  The first control unit 80 includes, for example, a pair of control boards 82a and 82b that control voltages and frequencies applied to the two compressors 20 of the first refrigerant circuit RA and the second refrigerant circuit RB, inverters and converters. A plurality of power modules 83, two smoothing capacitors 84, a plurality of reactors 85 for power factor improvement, a pair of filter substrates 86a and 86b, a pair of fan control substrates 87a and 87b, a plurality of terminal blocks 88 and a plurality of Various electrical components such as an electromagnetic contactor 89 are provided.

  The control boards 82a and 82b, the power module 83, and the fan control boards 87a and 87b generate a large amount of heat during operation and require positive heat dissipation. Therefore, in this embodiment, the plate-shaped heat sink 90 is thermally connected to the control boards 82a and 82b, the power module 83, and the fan control boards 87a and 87b.

  The heat sink 90 is formed of a metal material having excellent thermal conductivity, such as an aluminum alloy, and has a plurality of heat radiation fins 91 extending in the height direction of the electrical box 60. The heat radiating fins 91 are exposed to the first ventilation path 71 through the second partition plate 70a.

  As schematically shown in FIG. 15, electrical components such as the control boards 82 a and 82 b, the power module 83, the smoothing capacitor 84, and the fan control boards 87 a and 87 b are placed in the first region 68 a of the first storage chamber 68. Contained. The control boards 82a and 82b, the power module 83, and the fan control boards 87a and 87b are supported by the second partition plate 70a so as to stand along the second partition plate 70a.

  Further, as schematically shown in FIG. 16, other electrical components such as the reactor 85, the filter substrates 86 a and 86 b, the terminal block 88 and the electromagnetic contactor 89 are arranged in the second region 68 b of the first storage chamber 68. Is housed in.

  The control box 61 of the electrical unit 6 is attached to the front plate 64 of the electrical box 60. The control box 61 includes a power supply board and a main control board (not shown), and includes an operation panel 93 and a controller 94.

  As shown in FIGS. 8 to 13, the fan unit 100 is mounted on the electrical box 60. The fan unit 100 includes an elongated box-shaped fan case 100a and four electric fans 101a, 101b, 101c, and 101d attached to the upper surface of the fan case 100a.

  The fan case 100 a extends in the depth direction of the housing 2 so as to straddle the second region 68 b of the first storage chamber 68 and the second region 69 b of the second storage chamber 69. For this reason, the fan case 100 a is offset to the left side from the central portion along the width direction of the electrical equipment box 60 when the electrical equipment box 60 is viewed from the front F direction of the housing 2.

  The electric fans 101a, 101b, 101c, and 101d are arranged in a line at intervals in the depth direction of the housing 2. The electric fans 101a and 101b are incorporated in the fan case 100a in a horizontal posture in which the rotation axis is placed vertically so as to be positioned immediately above the second region 68b of the first storage chamber 68. The electric fans 101c and 101d are incorporated in the fan case 100a in a horizontal posture in which the rotation axis is placed vertically so as to be positioned immediately above the second region 69b of the second storage chamber 69. The electric fans 101a, 101b, 101c, and 101d all exhaust toward the upper side of the fan case 100a.

  As shown in FIG. 12, a top plate 102 a is attached to the upper part of the second region 68 b of the first storage chamber 68. The top plate 102a defines a fan chamber 103 in which the electric fans 101a and 101b are accommodated between the top surface of the fan case 100a.

  Furthermore, the top plate 102 a has an upright portion 104 that rises toward the fan chamber 103. A slit-like opening 105 is formed in the standing part 104. The opening 105 extends in the width direction of the electrical equipment case 60, and the second region 68 b and the fan chamber 103 communicate with each other through the opening 105.

  As shown in FIG. 11, the upper portion of the first region 68 a of the first storage chamber 68 is communicated with the fan chamber 103 inside the electrical box 60. At the same time, the upper part of the first ventilation path 71 is also communicated with the fan chamber 103 inside the electrical box 60.

  As shown in FIG. 12, a top plate 102 b is attached to the upper part of the second region 69 b of the second storage chamber 69. The top plate 102b defines a fan chamber 106 in which the electric fans 101c and 101d are accommodated between the top surface of the fan case 100a.

  The top plate 102 b has an upright portion 107 that rises toward the fan chamber 106. A slit-shaped opening 108 is formed in the standing portion 107. The opening 108 extends in the width direction of the housing 2, and the second region 69 b and the fan chamber 106 are communicated with each other via the opening 108.

  Further, the upper portion of the first region 69 a of the second storage chamber 69 is communicated with the fan chamber 106 inside the electrical box 60. At the same time, the upper part of the second ventilation path 76 is also communicated with the fan chamber 106 inside the electrical box 60.

  As shown in FIG. 14, the electric fans 101 a, 101 b, 101 c, and 101 d are provided between the one side edge along the depth direction of the drain pan 39 and the long side 9 a of the upper structure 9 below the air heat exchanger section 22. It faces the gap 40. Therefore, the exhaust blown upward from the electric fans 101a, 101b, 101c, 101d flows into the exhaust passage 33 between the air heat exchangers 29a, 29b through the gap 40.

  As shown in FIG. 17, the first control unit 80 in the electrical box 60 receives the command from the main control board of the control box 61 and the first refrigeration cycle unit 3 via the first relay unit 110. The first refrigerant circuit RA and the second refrigerant circuit RB are controlled.

  Similarly, when the second control unit 81 in the electrical box 60 receives a command from the main control board of the control box 61, the first control unit 61 of the second refrigeration cycle unit 4 is connected via the second relay unit 111. The refrigerant circuit RC and the second refrigerant circuit RD are controlled.

  As shown in FIGS. 2 and 5, the first relay unit 110 and the second relay unit 111 are separated from the electrical unit 6 and are disposed in the machine room 15. The first relay unit 110 is an element for obtaining information necessary for operating the first refrigerant circuit RA and the second refrigerant circuit RB, for example, and the first refrigeration cycle unit is provided in the machine room 15. 3 is provided at a position corresponding to 3. In the present embodiment, the first relay unit 110 is adjacent to the two gas-liquid separators 26 of the first refrigerant circuit RA and the second refrigerant circuit RB in the machine room 15.

  The second relay unit 111 is an element for obtaining information necessary for operating the third refrigerant circuit RC and the fourth refrigerant circuit RD, and the second refrigeration cycle unit 4 in the machine room 15. Is provided at a position corresponding to. In the present embodiment, the second relay unit 111 is adjacent to the two gas-liquid separators 26 of the third refrigerant circuit RC and the fourth refrigerant circuit RD in the machine room 15, and the first relay unit. The position is closer to the electrical unit 6 than 110.

  Accordingly, the positional relationship of the first relay unit 110 with respect to the first refrigeration cycle unit 3 and the positional relationship of the second relay unit 111 with respect to the second refrigeration cycle unit 4 are the same.

  Since the first relay unit 110 and the second relay unit 111 have a common configuration, the first relay unit 110 will be described as a representative, and the second relay unit 111 is denoted by the same reference numeral. Therefore, the description is omitted.

  As shown in FIG. 18, the first relay unit 110 has an electrical component box 112. The electrical component box 112 has a square box shape having a support plate 113, a bottom plate 114, and a pair of side plates 115a and 115b. The support plate 113 is erected vertically in the machine room 15, and its upper end is fixed to the long side 9 a of the upper structure 9 of the frame 7 by means such as bolting. The bottom plate 114 projects from the lower edge of the support plate 113 toward the side plate 12 of the housing 2. The side plates 115 a and 115 b protrude from both side edges of the support plate 113 toward the side plate 12 of the housing 2. The front edges of the side plates 115a and 115b are cut obliquely to avoid interference with the side plate 12 of the inclined housing 2.

  A relay board 117 is attached to the support plate 113 of the electrical component box 112. An electrical component 118 such as a plurality of connectors is mounted on the relay board 117. As schematically shown in FIG. 17, the relay board 117 of the first relay unit 110 includes various refrigerants constituting the first refrigerant circuit RA and the second refrigerant circuit RB via the plurality of first electric wires 120. Connected to the element.

An example of the first electric wire 120 is
Two electric wires connected to the two first temperature sensors T1 of the first refrigeration cycle unit 3,
Four electric wires connected to the four second temperature sensors T2 of the first refrigeration cycle unit 3,
Two electric wires connected to the two third temperature sensors T3 of the first refrigeration cycle unit 3,
Two electric wires connected to the two first pressure sensors P1 of the first refrigeration cycle unit 3,
Two electric wires connected to the two second pressure sensors P2 of the first refrigeration cycle unit 3,
Two electric wires connected to the two solenoid valves 47 of the first refrigeration cycle unit 3;
Two wires connected to the two four-way valves 21 of the first refrigeration cycle unit 3;
Two electric wires connected to a heater for heating the sealed container of the two compressors 20 of the first refrigeration cycle unit 3;
These are four electric wires connected to the four expansion valves 3 a and 23 b of the first refrigeration cycle unit 3.

  A first electric wire 120 similar to the first relay unit 110 is connected to the relay board 117 of the second relay unit 111. Furthermore, since the second relay unit 111 is located closer to the electrical unit 6 than the first relay unit 110 in the machine room 15, the electric fan 101a is provided on the relay board 117 of the second relay unit 111. , 101b, 101c, 101d are connected to two electric wires.

  In the present embodiment, the positional relationship of the first relay unit 110 with respect to the first refrigeration cycle unit 3 and the positional relationship of the second relay unit 111 with respect to the second refrigeration cycle unit 4 are the same. Therefore, between the first electric wire 120 wired between the first refrigeration cycle unit 3 and the first relay unit 110, and between the second refrigeration cycle unit 4 and the second relay unit 111. The first electric wires 120 wired over the common area are shared with each other.

  Accordingly, the first electric wire 120 corresponding to the first refrigeration cycle unit 3 and the first electric wire 120 corresponding to the second refrigeration cycle unit 4 have the same length and are routed in the machine room 15. The routes are also common to each other.

  Further, as shown in FIG. 17, the relay board 117 of the first relay unit 110 is connected to the first control unit 80 in the electrical box 60 and the main control in the control box 61 via the plurality of second electric wires 121. Connected to the board. Similarly, the relay board 117 of the second relay unit 111 is connected to the second control unit 81 in the electrical box 60 and the main control board in the control box 61 via a plurality of third electric wires 122. .

  When the operator operates the operation panel 93, the main control board of the control box 61 outputs a command corresponding to the operation content to the first control unit 80 and the second control unit 81. The command corresponding to the operation content is, for example, selection of an operation mode of the chilling unit 1, specification of the compressor 20 to be operated and setting of an operation frequency, the number of electric fans 101a, 101b, 101c, 101d to be driven, and the like. .

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

  When the operation panel 93 of the control box 61 is operated by the operator, the main control board outputs a command corresponding to the operation content to the first control unit 80 and the second control unit 81.

  For example, when a command for performing a cooling operation is output from the main control board to the first control unit 80 and the second control unit 81, the first control unit 80 is connected to the first control unit 80 via the first relay unit 110. Control is performed so that the first refrigerant circuit RA and the second refrigerant circuit RB of one refrigeration cycle unit 3 are operated in the cooling mode.

  Similarly, the second control unit 81 controls the third refrigerant circuit RC and the fourth refrigerant circuit RD of the second refrigeration cycle unit 4 to operate in the cooling mode via the second relay unit 111. To do.

  In the cooling mode, the four-way valve 21 of the first to fourth refrigerant circuits RA, RB, RC, and RD has a first port 21a communicating with the second port 21b and a third port as shown by a solid line in FIG. 21c is switched to communicate with the fourth port 21d.

  Further, the compressors 20 of the first to fourth refrigerant circuits RA, RB, RC, and RD are operated, and high-temperature and high-pressure gas-phase refrigerant is discharged from the compressor 20 to the circulation circuit 27. 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 outside 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 one other water heat. The exchanger 25 is shared. Therefore, in the first refrigerant circuit RA and the second refrigerant circuit RB, the gas-liquid two-phase refrigerant is led to the first refrigerant flow path 25a and the second refrigerant flow path 25b of the water heat exchanger 25, respectively. Heat is exchanged with water flowing through the passage 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 51c. 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 chilled water cooled in two stages is supplied from the fourth water pipe 51d to the utilization device side.

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

  On the other hand, when a command for performing the heating operation is output from the main control board of the control box 61 to the first control unit 80 and the second control unit 81, the first refrigerant circuit of the first refrigeration cycle unit 3 RA and the second refrigerant circuit RB are controlled to operate in the heating mode, and the third refrigerant circuit RC and the fourth refrigerant circuit RD of the second refrigeration cycle unit 4 are controlled to operate in the heating mode. The

  In the heating mode, the four-way valve 21 of the first to fourth refrigerant circuits RA, RB, RC, and RD has a first port 21a communicating with the third port 21c and a second port as shown by a broken line in FIG. 21b is switched to communicate with the fourth port 21d.

  When the operation is started 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 to the utilization device side as warm water.

  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 outside 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 is discharged from the compressor 20 as a high-temperature / high-pressure gas-phase refrigerant.

  The first control unit 80 that controls the first refrigerant circuit RA and the second refrigerant circuit RB of the first refrigeration cycle unit 3 and the third refrigerant circuit RC and the fourth refrigerant of the second refrigeration cycle unit 4 The second control unit 81 that controls the circuit RD generates heat during operation. Therefore, the two electric fans 101a and 101b corresponding to the first storage chamber 68 of the electrical box 60 operate in response to a command from the first control unit 80 and correspond to the second storage chamber 69 of the electrical box 60. The two electric fans 101 c and 101 d operate according to a command from the second control unit 81.

  When the electric fans 101a, 101b, 101c, and 101d operate, the air in the fan chambers 103 and 106 is discharged above the fan case 100a. For this reason, negative pressure acts on the first storage chamber 68 and the first ventilation path 71 communicated with the fan chamber 103. Similarly, negative pressure acts on the second storage chamber 69 and the second ventilation path 77 communicated with the fan chamber 106.

  Since the first storage chamber 68 and the second storage chamber 69 communicate with the machine chamber 15 in the housing 2 through the plurality of vent holes 75 and 77, the air in the machine chamber 15 is vented. , 77 is sucked into the first storage chamber 68 and the second storage chamber 69.

  The air sucked into the first region 68a of the first storage chamber 68 and the first region 69a of the second storage chamber 69 is representatively shown on the side of the first storage chamber 68 in FIG. Then, the air flows toward the upper portion of the first region 68 a and flows into the fan chamber 103.

  The air sucked into the second region 68b of the first storage chamber 68 and the second region 69b of the second storage chamber 69 is, as shown by arrows in FIGS. 11 and 12, the second region 68b, It goes to the upper part of 69b and flows into the fan chambers 103 and 106 through the slit-shaped openings 105 and 108.

  In other words, an air flow toward the fan chambers 103 and 106 is formed inside the first storage chamber 68 and the second storage chamber 69, respectively, and the first storage chamber 68 and the second storage chamber 69 are generated by the air flow. The various electrical components 82a, 82b, 83, 84, 85, 86a, 86b, 87a, 87b, 88, 89 housed in the are forcibly cooled.

  As shown in FIGS. 11 and 14, the first ventilation path 71 and the second ventilation path 76 are opened in the introduction hole 72 opened in the bottom plate 62 of the electrical equipment box 60 and the bottom plate 14 of the housing 2. The air passage 73 communicates with the bottom plate 14 and the installation surface G through the communication hole 14a. For this reason, when negative pressure acts on the first ventilation path 71 and the second ventilation path 76, the air outside the chilling unit 1 flows from the outside air introduction port 74 through the communication hole 14 a and the introduction hole 72 to the first ventilation path 71. And sucked into the second ventilation path 76. The sucked air flows through the first ventilation path 71 and the second ventilation path 76 from bottom to top and flows into the fan chambers 103 and 106.

  The air flowing through the first ventilation path 71 and the second ventilation path 76 passes between the heat radiation fins 91 of the heat sink 90 that receives the heat of the control boards 82a and 82b, the power module 83, and the fan control boards 87a and 87b. As a result, the heat transmitted to the heat sink 90 is released by multiplying the air flow, thereby forcibly cooling the control boards 82a and 82b, the power module 83, and the fan control boards 87a and 87b.

  The air that has passed through the radiating fins 91 merges with the air that has passed through the first storage chamber 68 and the second storage chamber 69 in the fan chambers 103 and 106, and is then discharged toward the upper side of the fan case 100a.

  According to the present embodiment, the electric fans 101 a, 101 b, 101 c, 101 d of the fan unit 100 are located below the gap 40 between the drain pan 39 and the upper structure 9 of the frame 7. For this reason, the air discharged upward from the electric fans 101a, 101b, 101c, and 101d is guided to the exhaust passage 33 between the air heat exchangers 29a and 29b through the gap 40.

  The air guided from the fan unit 100 to the exhaust passage 33 is sucked up together with the air that has passed through the air heat exchangers 29 a and 29 b by the fan 30 toward the exhaust port 37, and from the exhaust port 37 to the air heat exchanger unit 22. It is discharged upward. Therefore, the air after cooling the electrical unit 6 does not blow out into the machine room 15.

  Specifically, air outside the chilling unit 1, that is, outside air, is guided to the first ventilation path 71 and the second ventilation path 76 where the heat radiation fins 91 of the heat sink 90 are exposed through the outside air introduction port 74. . Since the outside air contains dust and moisture, if the outside air that has passed through the heat sink 90 is discharged into the machine room 15, it cannot be denied that dust accumulates in the machine room 15 at an early stage.

  On the other hand, in the present embodiment, the air that has passed through the heat sink 90 is sucked up by the fan 30 of the air heat exchanger section 22 and discharged from the exhaust port 37 to above the air heat exchanger section 22. Accordingly, dust contained in the air can be prevented from accumulating in the machine room 15 and adhering to the first refrigeration cycle unit 3 and the second refrigeration cycle unit 4.

  According to the present embodiment, the first refrigerant circuit RA, the second refrigerant circuit RB, the third refrigerant circuit RC, and the fourth refrigerant circuit RD are independent of each other. The control unit 81 selects a refrigerant circuit to be operated according to, for example, a cooling load or a heating load. At the same time, the first control unit 80 and the second control unit 81 specify the electric fans 101a, 101b, 101c, and 101d to be driven according to the operation status of the refrigerant circuits RA, RB, RC, and RD, The number of electric fans 101a, 101b, 101c, 101d to be driven is controlled.

  Specifically, for example, when the third refrigerant circuit RC is stopped, the first control unit 80 and the second control unit 81 operate only the three electric fans 101a, 101b, and 101d.

  As a result, only the electric fans 101a, 101b, 101c, and 101d corresponding to the first control unit 80 and the second control unit 81 that control the refrigerant circuit in operation are selectively operated, and all of them are always operated. The electric fans 101a, 101b, 101c, and 101d are not driven.

  Therefore, power consumption required for cooling the first control unit 80 and the second control unit 81 can be suppressed, and energy saving measures can be promoted.

  In addition, the electric fans 101a, 101b, 101c, and 101d corresponding to the first control unit 80 and the second control unit 81 that require cooling during the operation of the chilling unit 1 are selectively driven. It is possible to avoid excessive cooling air being sucked into the box 60.

  As a result, dust contained in the air stays in the electrical box 60 at an early stage or adheres to various electrical components constituting the first control unit 80 and the second control unit 81. Can be prevented. Therefore, it is possible to minimize the possibility that the first control unit 80 and the second control unit 81 malfunction or are damaged.

  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.

  In the embodiment, two electric fans are arranged for each control unit, but the number of electric fans is not particularly limited. For example, one electric fan or three or more electric fans are arranged for each control unit. Also good.

  Further, the air-cooled chilling unit may be a cooling-only chilling unit.

  6 ... electric unit, 68, 69 ... storage chamber (first storage chamber, second storage chamber), 68a, 69a ... first region, 68b, 69b ... second region, 80, 81 ... control unit ( First control unit, second control unit), 101a, 101b, 101c, 101d ... electric fan, RA, RB, RC, RD ... refrigerant circuit (first refrigerant circuit, second refrigerant circuit, third Refrigerant circuit, fourth refrigerant circuit).

Claims (8)

A plurality of independent refrigerant circuits;
An electrical unit including a plurality of control units for individually controlling the refrigerant circuit,
The electrical unit has a plurality of storage chambers for storing the control unit, and each of the storage chambers is provided with at least one electric fan for cooling the control unit according to the operating state of the refrigerant circuit. apparatus.   Each of the storage chambers is partitioned into a first region and a second region, and electric parts constituting the control unit are stored in the first region and the second region, and the electric fan The refrigeration cycle apparatus according to claim 1, wherein the refrigeration cycle apparatus is configured to suck air in the first region and the second region.   The electrical unit has a ventilation path connected to the suction side of the electric fan between the first region and the second region, and a heat sink thermally connected to the electrical component accompanied by heat generation The refrigeration cycle apparatus according to claim 2 exposed to the ventilation path.   The housing further includes a housing in which a machine room for housing the electrical unit is formed, the housing chamber has a vent hole opened in the machine room, and the housing communicates with an upstream end of the ventilation path. The refrigeration cycle apparatus according to claim 3, further comprising an outside air inlet.   The housing includes a lower structure installed on an installation surface, an upper structure disposed above the lower structure, and a plurality of connections between the lower structure and the upper structure. 5. The refrigeration cycle apparatus according to claim 4, further comprising a frame configured of a vertical rail, wherein the outside air inlet is formed in the lower structure.   Each refrigerant circuit includes an air heat exchanger unit installed on the electrical unit, and the air heat exchanger unit and the pair of air heat exchangers facing each other with a space therebetween, and the air heat exchange 6. A refrigeration cycle according to claim 4, further comprising: an exhaust passage formed between the coolers; and a fan that exhausts air guided through the air heat exchanger to the exhaust passage upward. apparatus.   The refrigeration cycle apparatus according to claim 6, wherein the electric fan is disposed on an upper surface of the electrical unit and exhausts toward the exhaust passage of the air heat exchanger unit.   A drain pan is disposed between the electrical unit and the air heat exchanger unit, a gap is formed between an edge of the drain pan and the housing, and the electric fan is disposed below the gap. The refrigeration cycle apparatus according to claim 7.

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