Daikin Industries Patente

There is provided a use as a refrigerant in a refrigeration cycle apparatus capable of suppressing decomposition of the refrigerant. In a use as a refrigerant in a refrigeration cycle apparatus (1), the refrigeration cycle apparatus having a refrigerant circuit (10) including a compressor (11), the compressor (11) including a compression element (21) that compresses the refrigerant, and an oil reservoir (37) that stores a refrigerating machine oil, the pressure of air inside the refrigerant circuit (10) being 667 Pa or less, the refrigerating machine oil containing 3.0 wt% or more and 5.0 wt% or less of an acid scavenger, the temperature of the refrigerating machine oil in the oil reservoir (37) being maintained at 120°C or lower, and the refrigerant being at least one of a mixed refrigerant containing 1,2-difluoroethylene and one or more types of hydrofluorocarbon, a mixed refrigerant containing 1,2-difluoroethylene and one or more types of hydrofluoroolefin, and a mixed refrigerant containing one or more types of hydrofluorocarbon and one or more types of hydrofluoroolefin.

A partitioning member (5) is arranged between a plate stack (30) and a refrigerant inlet (21). The partitioning member (5) extends along a first direction that is a stacking direction of the plate stack (30). The partitioning member (5) has a plurality of communication holes (50). The plurality of communication holes (50) are open toward the plate stack (30) at positions facing the central heat exchange section (35), the first heat exchange section (36), and the second heat exchange section (37).

A refrigeration cycle apparatus includes: a shut-off valve (26, 43) configured to shut off a flow of a refrigerant from a heat-source-side circuit (20a) to a utilization-side circuit (45) when a refrigerant leakage sensor (70) detects leakage of the refrigerant; and a controller (100) configured to execute a determination action including: a first control to close the shut-off valve (26, 43) or reduce an opening degree of the shut-off valve (26, 43) during operation of a compressor (22); and a second control to determine, after the first control, whether the shut-off valve (26, 43) is abnormal, based on a pressure or temperature of the refrigerant in a refrigerant circuit (10). The controller (100) executes the determination action in response to acquisition of a first signal for setting the utilization unit (40) to a thermo-off state.

An air conditioning system (1) includes an air conditioner (2) that includes a first refrigerant circuit (23), adjusts a temperature of air taken in from an indoor space by heat exchange with a refrigerant, and supplies the air to the indoor space, a ventilator (3) that adjusts a temperature of air taken in from outdoors and supplies the air to the indoor space, and a control unit (4) that controls the air conditioner (2) and the ventilator (3) in accordance with a heat load of the indoor space that requires temperature adjustment, in which when the heat load of the indoor space to be temperature-adjusted by the first indoor unit (22A) of the air conditioner (2) is in a high-load state and the heat load of the indoor space to be temperature-adjusted by the second indoor unit (22B) is in a low-load state, the control unit (4) stops a temperature adjustment operation of the second indoor unit (22B) and performs the temperature adjustment operation by the ventilator (3).

An air conditioner capable of suppressing inflow of a refrigerant into a heat exchanger as necessary is provided. An air conditioner 1 includes a refrigerant circuit including a utilization heat exchanger (22) having a connection portion (22a) into which a refrigerant flows and a connection portion (22b) from which the refrigerant flows out, and a flow path switching valve (100). A flow path switching valve includes a body (120) in which a first space (V1) is formed and ports (122a to 122d) are provided on an inner wall (122), and a valve body (140) disposed in the first space and forming a first flow path (R1) through which the refrigerant flows. The port (122b) communicates with the connection portion (22a), and the port (122c) communicates with the connection portion (22b). In the valve body (140), the first flow path is switched to a state of connecting the port (122a) and the port (122b), a state of connecting the port (122a) and the port (122c), and a state (S3) of connecting the port (122b) and the port (122c), and the ports to which the first flow path is not connected in each state are connected by a second flow path (R2) formed in the first space.

Provided is a flow path switching valve having the flow paths extending in multiple directions, the flow path switching valve preventing a valve element from being separated from a seal member. A flow path switching valve includes a valve body (40), a valve element (50), and a seal member (70). The valve body (40) wherein a valve chamber (30) is formed internally, and at least three or more ports (Pi1 to Pi3) serving as fluid inlets and outlets are provided on the wall surface forming the valve chamber (30). The valve element (50) is disposed in the valve chamber (30) and has a first passage (51) through which the fluid flows. The seal member (70) seals an interface between the valve element (50) and at least one of the ports. The seal member (70) includes a base portion (80) and an extended portion (90). The base portion (80) is disposed on the port side. The extended portion (90) is extended so as to open from the base portion (80) side toward the valve element (50), and is brought into contact with the valve element (50) while being biased toward the valve element (50) in a communication state.

A flow path switching valve having a small pressure loss is provided. A flow path switching valve (100) includes a body casing (120) having a first end (125a) and a second end (125b), in which a first space (V1) is formed inside, and a first port (130a), a second port (130b), and a third port (130c) are provided on an outer surface (124), and a valve body disposed inside the first space. The state of the valve body is switched between a first state in which the first port and the second port are connected and a second state in which the first port and the third port are connected. The second port and the third port are disposed at the first end of the body casing, and the first port is disposed at the second end of the body casing.

Provided is a method for producing a purified fluoroalkyne compound, wherein the method includes subjecting a water-containing fluoroalkyne compound to a dehydration process using a fluorinated adsorbent to obtain a purified fluoroalkyne compound, and the fluoroalkyne compound is a fluoroalkyne compound represented by the formula 1.

An indoor expansion valve (51) is an expansion valve that decompresses a refrigerant. The indoor expansion valve (51) includes a valve main body (41), a first pipe (100), and a second pipe (200). The valve main body (41) has a valve chamber (43) in which a valve body (42) is accommodated. The first pipe (100) is connected to the valve chamber (43) in a first direction that is an axial direction of the valve body (42). The second pipe (200) is connected to the valve chamber (43) in a second direction intersecting the first direction. The second pipe (200) has a wall thickness (T) at a reference position (L0) that is an end portion (200a) on the valve chamber (43) side being smaller than the wall thickness (T) at a first position (L1) away from the reference position (L0) by a first distance on a side opposite to the valve chamber (43) in the second direction.

This invention provides a method for purifying HFO-1132 to a high purity while suppressing the isomerization and loss of HFO-1132. Specifically, the present invention provides a method for purifying 1,2-difluoroethylene, which is HFO-1132, the method comprising, in this order,step 1 of bringing a composition comprising trans-1,2-difluoroethylene, which is HFO-1132(E), and water into contact with a zeolite having an average pore size of 2 to 4 Å to reduce the water content from the composition; andstep 2 of recovering a purified product containing HFO-1132(E) and a reduced content of water, and containing less than 0.1% by volume of HFO-1132(2).

An outdoor unit includes a casing, a refrigerant pipe, a refrigerant detection sensor, openings that communicate the inside and the outside of the casing, pipe connection parts, a first cover, and a second cover. The refrigerant pipe is disposed in the casing. A refrigerant flows through the refrigerant pipe. The refrigerant detection sensor is disposed in the casing. The openings that communicate the inside and the outside of the casing are formed on a side surface of the casing. The pipe connection parts connect the refrigerant pipe and a connection pipe extending from an indoor unit. The first cover includes a first portion, a second portion, and a coupling portion. The second cover covers the first cover. The coupling portion is disposed between the first portion and the second portion. The first cover covers the openings and the pipe connection parts. The first portion and the second portion of the first cover are openable and closable by relative movement via the coupling portion.

An object of the present disclosure is to newly provide high-purity octafluorocyclobutane. High-purity octafluorocyclobutane is provided.

The disclosure provides a method for producing a polytetrafluoroethylene molded article, capable of improving the tensile strength of the resulting polytetrafluoroethylene molded article, regardless of whether the polytetrafluoroethylene used is a recycled product or a virgin product, without using a special infrared irradiation device and a rubber mold, and a polytetrafluoroethylene molded article. Provided is a method for producing a polytetrafluoroethylene molded article, including a rolling step of rolling polytetrafluoroethylene at 50 MPa or higher to obtain a molded article.

Provided is an air conditioner capable of accurately detecting a refrigerant leakage. An air conditioner (100) includes a refrigerant circuit (10) and a detector (61). The refrigerant circuit includes a heat source heat exchanger (23), an expansion valve (24), and a utilization heat exchanger (51), and is filled with a refrigerant. The detector detects a refrigerant leakage in the refrigerant circuit. The detector detects the refrigerant leakage by comparing a first value (P1) corresponding to a first estimated flow rate (F1) that is an estimated flow rate (F) of the refrigerant flowing through the expansion valve in a first term (T1) with a second value (P2) corresponding to a second estimated flow rate (F2) that is an estimated flow rate of the refrigerant flowing through the expansion valve in a second term (T2) before the first term.

The indoor heat exchanger (40) includes: a heat exchanger body (B) that has a plurality of fins (41) arranged in a first direction and a heat transfer tube (42) penetrating the plurality of fins (41); and a plate structure (50) that is arranged side by side with the heat exchanger body (B) in the first direction and forms a refrigerant flow path (51) communicating with the heat transfer tube (42). The regulation mechanism (60, 80) is disposed in the indoor casing (31) to overlap the heat exchanger body (B) and the plate structure (50) when viewed in the first direction.

An electric component module 10 includes a first board 21 having a first circuit 31 including a noise generation source, a second board 22 having a second circuit 32 including a microcomputer 35 that transmits and receives a communication signal CS to and from a control circuit 41 other than the first circuit 31, the second board 22 being separated from the first board 21, and an electric wire 51 that transmits and receives a simple signal SS between the first circuit 31 and the second circuit 32.

Provided is a refrigeration cycle device for vehicle capable of effectively using different temperature regions of a heat exchanger generated by using a zeotropic refrigerant mixture. The refrigeration cycle device for vehicle has a refrigerant circuit (10) in which a zeotropic refrigerant mixture circulates. The refrigerant circuit (10) has an indoor heat exchanger (18) including a first indoor heat exchanger (16) and a second indoor heat exchanger (17). The first indoor heat exchanger (16) and the second indoor heat exchanger (17) are arranged in series with each other in the flow of the refrigerant in the refrigerant circuit (10). The first indoor heat exchanger (16) is positioned on the upstream side of the second indoor heat exchanger (17) in a direction in which the refrigerant flows when the first indoor heat exchanger (16) and the second indoor heat exchanger (17) are caused to function as evaporators of the refrigerant.

To provide a refrigerant compressor capable of suppressing a refrigerating machine oil from remaining at a slide portion while maintaining a low miscibility between an R290 refrigerant and the refrigerating machine oil. The scroll compressor includes a compression mechanism that compresses an R290 refrigerant, a drive shaft that transmits power to the compression mechanism, a slide bearing (200) that axially supports the drive bearing, a casing that houses the compression mechanism, the drive bearing, and the slide bearing, and a refrigerating machine oil stored in the casing. The refrigerating machine oil is PAG, POE, or PVE having an OH group at a terminal of a chemical structure. The slide bearing has a composite material CM including a resin-impregnated layer (220) in which a porous metal M is impregnated with a resin P including PTFE. A slide surface (222) of the slide bearing is formed of a resin-impregnated layer, and the metal is exposed at a predetermined metal exposure rate. A surface energy on a surface of the resin-impregnated layer of the composite material at the predetermined metal exposure rate is less than 40 mN/m.

The first surface (51) includes a valve seat surface (58) that is in contact with the tip portion (72) of the reed valve (70) in a closed state and a groove (59) that is formed around the valve seat surface (58) and overlaps an outer edge (72a) of the tip portion (72) as viewed in a second direction. The first surface (51) has a contact surface (75) that is configured to be in contact with the movable portion (73) of the reed valve (70) in the closed state.

In a rotary compressor, when viewed in an axial direction, a region that overlaps a cylinder chamber (S1) between a blade (38) and a thin portion (52) is defined as a first region (77); a region that overlaps the cylinder chamber (S1) between the blade (38) and a suction port is defined as a second region (78); and when a piston (35) is located at a bottom dead center, a gap (CR1) between part of an outer edge of the piston (35) that corresponds to the first region (77) and part of a closing member (50) that corresponds to the first region (77) is larger than a gap (CR2) between part of the piston (35) that corresponds to the second region (78) and part of the closing member (50) that corresponds to the second region (78).

An indoor unit is an indoor unit of an air conditioning apparatus. The indoor unit is configured to adopt a zeotropic refrigerant as a refrigerant. The indoor unit includes a main heat exchanger, a flow divider, and a sensor. The main heat exchanger includes a plurality of tube passes through which the refrigerant flows. The flow divider is configured to divide the refrigerant before the refrigerant flows into the plurality of tube passes. The sensor is configured to detect a temperature of the refrigerant. The sensor is disposed near the flow divider, is disposed between the flow divider and the main heat exchanger, or is disposed on one of the tube passes defined by heat transfer tubes of the main heat exchanger, at a position that is closer to the flow divider than a midpoint of an entire length of the one of the tube passes is.

A refrigerant flow path module (40) includes a flow path unit (32) provided with a first refrigerant flow path (R1) and a second refrigerant flow path (R2) through which a refrigerant flows, and a casing (33) that accommodates the flow path unit (32), in which the flow path unit (32) is formed with a synthetic resin or a material containing aluminum as a main component, and the casing (33) is formed with a steel material.

When a first compressor (11) and a second compressor (51) are in a stopped state, a control unit (100) executes a first operation in which the first compressor (11) is operated while keeping the second compressor (51) in the stopped state to cause heat dissipation of a first refrigerant in a refrigerant heat exchanger (52). After the first operation, the control unit (100) executes a second operation in which the second compressor (51) is operated.

With a charging method, a refrigeration apparatus 1 is filled with a refrigerant and an odor component. The charging method includes a first step of providing a cylinder 51 containing a mixed liquid in which the odor component is dissolved, a second step of connecting the cylinder 51 to a refrigerant circuit 10 of the refrigeration apparatus 1, and a third step of filling the refrigerant circuit 10 with the mixed liquid supplied from the cylinder 51. Since the refrigerant and the odor component are mixed in a liquid phase, the odor component can be stably supplied and charged into the refrigerant circuit 10 at an appropriate concentration.

A refrigeration cycle apparatus (100) includes a heat source heat exchanger (13), a utilization heat exchanger (23), and a bridge circuit (40). The heat source heat exchanger (13) includes a refrigerant inlet pipe 13a and a refrigerant outlet pipe 13b. The bridge circuit (40) always causes the refrigerant to flow into a first heat exchanger at the refrigerant inlet pipe and flow out of the first heat exchanger at the refrigerant outlet pipe. The first heat exchanger includes a diverger (50). A diverger body (51) of the diverger (50) has one intake port (53) and a plurality of exhaust ports (54). A plurality of refrigerant paths (61) of the heat source heat exchanger (13) includes a lowest path (61L) disposed at a height (H1) that is lowest. A height (H0) of the plurality of exhaust ports (54) is all higher than the height (H1) of the lowest path.

A heat source unit (2) includes an electric component unit (70), a heat source-side refrigerant main flow path (300), and a first refrigerant sub flow path (46) including a first cooling portion (47) that cools a first portion of the electric component unit (70) and a second portion of the electric component unit (70). The heat source-side refrigerant main flow path (300) includes an accumulator (29), a compressor (21), a heat source-side heat exchanger (23), and a heat source-side expansion valve (25). The heat source-side refrigerant main flow path (300) is connected to a utilization-side refrigerant flow path (500) of a utilization unit (3a, 3b) to form a refrigerant circuit (10). The first refrigerant sub flow path (46) branches from a liquid flow path (340) extending from the heat source-side heat exchanger (23) to the utilization-side refrigerant flow path (500) in the heat source-side refrigerant main flow path (300), and causes a refrigerant to flow in a gas flow path (310) between the accumulator (29) and the compressor (21) in the heat source-side refrigerant main flow path (300).

A first head (31) has a first discharge port (49). A first discharge valve (60) opens and closes the first discharge port (49). A first fastener (61) fixes a base end portion of the first discharge valve (60) to the first head (31). A cylinder (70) has a vane chamber (73) configured to house a vane (77), the vane chamber (73) having a first center line (L1). The first head (31) is divided into a first region on the side of the first center line (L1) corresponding to the suction space and a second region on the side of the first center line (L1) corresponding to the discharge space when viewed from a first direction. The first fastener (61) is disposed in the first region of the first head (31).

A stator (21) has a core (22), a coil (23), a first insulating portion (26), and a connecting portion (100). The coil (23) is a winding (23a) wound around each of teeth (25). The first insulating portion (26) is provided between the core (22) and the coil (23), and insulates the core (22) and the coil (23) from each other. The connecting portion (100) connects the first insulating portion (26) and the core (22). The connecting portion (100) is formed so that the coil (23) and the first insulating portion (26) can vibrate in the radial direction relative to the core (22).

An air composition adjustment device adjusts a composition of air in an internal space (5) of a container (1), the air composition adjustment device including a composition adjuster (200) that supplies, to the internal space (5), a gas to be treated having a composition different from a composition of external air generated by treating the external air, a control unit (110) that controls the composition adjuster (200), and a first pressure detector (170) that detects a pressure in the internal space (5), in which the composition adjuster (200) includes a conveyor (231a, 231b) that conveys the external air or the gas to be treated to the internal space (5), and the control unit (110) evaluates airtightness of the internal space (5) on the basis of a change in the pressure in the internal space (5) caused by operation of the conveyor (231a, 231b).

A refrigeration cycle apparatus (100) includes a heat source heat exchanger (13) and a bridge circuit (40). The heat source heat exchanger (13) includes a refrigerant inlet pipe (13a), a refrigerant outlet pipe (13b), a plurality of refrigerant paths (61), a diverger (50), and a converger (70). The bridge circuit (40) always causes a refrigerant (R) to flow into the heat source heat exchanger (13) at the refrigerant inlet pipe (13a) and flow out of the heat source heat exchanger (13) at the refrigerant outlet pipe (13b). The plurality of refrigerant paths (61) is connected to a plurality of diverger pipes (56) of the diverger (50) and a plurality of converger pipes (75) of the converger (70). The number of the diverger pipes (56) is smaller than the number of the converger pipes (75).

A first switching mechanism (15) is switchable between a first state in which a discharge side of a first compressor (11) is connected to a first water heat exchanger (14) or a refrigerant heat exchanger (30) and a second state in which the discharge side of the first compressor (11) is connected to a heat source heat exchanger (12). In a defrosting operation for defrosting the heat source heat exchanger (12), a control unit (100) drives the first refrigerant circuit (10) with the first switching mechanism (15) set in the second state.

A rotary compressor includes a shaft extending in a first direction, a motor to drive the shaft, a first bearing including a discharge hole to discharge a compressed refrigerant, and supporting the shaft, a cylinder including a cylinder chamber formed inside the cylinder, a roller to eccentrically rotate in the cylinder chamber, and a muffler disposed so as to cover the discharge hole, wherein the motor, the muffler, the first bearing, and the cylinder are arranged in stated order along the first direction, the first bearing includes a boss which supports the shaft and protrudes toward the muffler, the muffler includes an opening through which the boss is disposed, and the first bearing or the muffler includes one or more positioning structures to determine a position of the muffler with respect to the first bearing such that clearance in the opening is formed along an entire periphery of the boss.

The rotary compressor (1) includes a drive shaft (31), a compression mechanism (30) for a refrigerant, and a casing (10). The compression mechanism (30) has a bearing (41) fixed to the casing (10) by a fixture member (44). The fixture member (44) has a first plate portion (44a) above the bearing (41), and the fixture member (44) and the compression mechanism (30) have a flow path for a fluid. The flow path includes a fluid inlet (44d) including a first plate portion (44a), a wall surface (41k) below the fluid inlet (44d), a first space (P1) between the fluid inlet (44d) and the wall surface (41k), a second space (P2) which is positioned below the fixture member (44) and shifted from the first space (P1) in a radial direction and/or a circumferential direction and through which the fluid that has collided with the wall surface (41k) flows, and a fluid outlet (41j) below the second space (P2).

The displacement volume of a compression mechanism (40) is defined as Vc [cc], the density of a refrigerant at 1.9 Mpa and 75°C as Dg [g/cm<3>], the number of revolutions of a rotary shaft (30) as N [rps], the volume of a primary space (S1) as V1 [cc], the volume of a secondary space (S2) as V2 [cc], the height of the primary space (S1) as H1 [cm], the height of the secondary space (S2) as H2 [cm], the density of refrigerating machine oil at 15°C as Do [g/cm<3>], and the solution viscosity of the refrigerating machine oil present at a level of a suction port (71a) or lower as η [mPa·S]. The rotary compressor satisfies relational expressions: N ≥ 100 [rps]; and ((8.19 × 10<-8> × Vc × Dg + 0.000327) × Vc<3.657> × N<3.126>)/(V1 × V2 × H1<1.867> × H2<1.556> × Do × η) ≤ 1.0. <img class="EMIRef" id="9bc56977-2269-4b63-9ad7-c8054ca75a0e-ia01" />

An injection flow path (61) communicating with an injection pipe (9c) is formed in a first cylinder (31, 41), a middle plate (55), and a second cylinder (31, 41). The injection flow path (61) includes: a first flow path (61a) connected to the injection pipe (9c); a second flow path (61b, 61c) branching from the first flow path (61a) and communicating with a first cylinder chamber (S1, S2); and a third flow path (61b, 61c) branching from the first flow path (61a) and communicating with the second cylinder chamber (S1, S2).

A turbo compressor (10) includes: an intermediate flow path (30) allowing a refrigerant to flow between a first impeller (11) and a second impeller (21); a diffuser flow path (40) through which a refrigerant having flowed out of the second impeller (21) flows; and a volute flow path (50) through which a refrigerant having passed through the diffuser flow path (40) flows. The diffuser flow path (40) includes: a flat flow path (43) extending in a radial direction; and a curved flow path (44) curved to a side opposite to a side on which a refrigerant flows in with respect to the flat flow path (43) in the axial direction. The volute flow path (50) is connected to the curved flow path (44) extending in the circumferential direction, and the maximum value (Rv) of the outer diameter of the volute flow path (50) is smaller than or equal to the maximum value (Rr) of the outer diameter of the intermediate flow path (30).

In a rotary compressor, a cylinder (31, 41, 231, 241, 331) and a closing member (50, 55, 56, 250, 255, 256, 350, 356) are fixed to each other by a plurality of bolts (B) extending in an axial direction of a rotary shaft (90). The plurality of bolts (B) include: a first bolt (B1) between a suction pipe (14, 214a, 214b, 314) and a housing (33, 43) housing a blade (38, 48) as viewed in the axial direction; and a second bolt (B2) between the housing (33, 43) and an imaginary line (IL), which is symmetrical to a center line (AL) of the suction pipe (14, 214a, 214b, 314) with respect to the housing (33, 43), as viewed in the axial direction.

A first cylinder (31) is provided with a first valve housing portion (31j) recessed from the inner peripheral surface toward the outer side and housing a first reed valve (63) and a valve retainer (64). The valve retainer (64) has a first surface (64b) facing the first reed valve (63) and a second surface (64c) opposite to the first surface (64b). A center line (C1) extending in the longitudinal direction of the first reed valve (63) crosses an opening of the first valve housing portion (31j) that is close to the first cylinder chamber (S1). A first edge (31k) that is located on the opening of the first valve housing portion (31j) which is close to the first cylinder chamber (S1) and that is close to the valve attachment surface (31g) is located closer to the second surface (64c) of the valve retainer (64) than the valve attachment surface (31g) in a first direction orthogonal to the valve attachment surface (31g).

A refrigeration apparatus includes a refrigerant unit (U) that includes a first refrigerant circuit (R1) configured to perform a refrigeration cycle by using a first refrigerant, which is a highly flammable refrigerant, in which the first refrigerat circuit (R1) includes a first refrigerant pipe (27a) that is configured to connect a first heat exchanger (23) and a decompression mechanism (24) to each other, a second refrigerant pipe (27b) that is configured to connect the decompression mechanism (24) and a second heat exchanger (22) to each other, a third refrigerant pipe (27c) that is configured to connect the second heat exchanger (22) and a compressor (21) to each other, and a fourth refrigerant pipe (27d) that is configured to connect the compressor (21) and the first heat exchanger (23) to each other, and in which the first to fourth refrigerant pipes (27a to 27d) have structures in which a first capacity, which is a sum of a capacity of the first refrigerant pipe (27a) and a capacity of the second refrigerant pipe (27b), is smaller than a second capacity, which is a sum of a capacity of the third refrigerant pipe (27c) and a capacity of the fourth refrigerant pipe (27d).

A hot water supply unit includes: a refrigerant unit (U) including a refrigerant circuit (R1) that performs a refrigeration cycle using a first refrigerant that is a flammable refrigerant; a tank (41) configured to store water directly or indirectly heated by the first refrigerant; and a casing (60) disposed in the indoor space (I) and configured to house the refrigerant unit (U) and the tank (41). The refrigerant unit (U) is disposed below the tank (41).