Heat source device

Abstract

A heat source apparatus includes: a compressor (12) in a refrigerant circuit (11) that performs a refrigeration cycle; a cylinder (71) which is configured to store a flammable refrigerant for filling the refrigerant circuit (11) and which has a lower portion provided with a discharge port (711) through which the flammable refrigerant is discharged; an accumulator (17) connected to the compressor (12); and a casing (21) having a bottom plate (23) on which the compressor (12), the cylinder (17), and the accumulator (17) are installed, wherein in top view, a first virtual line (L1) connecting a center (12b) of the compressor (12) and a center (71b) of the cylinder (71) and a second virtual line (L2) connecting the center (12b) of the compressor (12) and a center (17b) of the accumulator (17) form a predetermined angle (θ).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a heat source apparatus.BACKGROUND ART

[0002] Patent Document 1 discloses a heat source apparatus that includes a compressor and an accumulator which are connected to a refrigerant circuit. The compressor is installed on a bottom plate in a casing of the heat source apparatus.CITATION LISTPATENT DOCUMENT

[0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2013-155921SUMMARY OF THE INVENTIONTECHNICAL PROBLEM

[0004] The inventors of the present application have created a configuration in which a refrigerant cylinder is provided in the casing of the heat source apparatus. The refrigerant cylinder stores a refrigerant for filling the refrigerant circuit. Thus, when the heat source apparatus is installed, the refrigerant circuit can be filled with the refrigerant from the refrigerant cylinder, and thus it is unnecessary to separately prepare a refrigerant for filling the circuit. On the other hand, when the refrigerant cylinder is provided in the casing, the following specific problems arise.

[0005] When the heat source apparatus is transported before being installed on a site, there is a risk that the casing is dropped. Here, the compressor, the refrigerant cylinder, and the accumulator are provided in the casing. When the casing is dropped toward the ground, the casing may touch the ground in a state in which a side of the bottom plate is oriented along the ground. In this case, when the compressor is displaced and collides with the accumulator due to the impact by the casing being dropped, and the accumulator is displaced due to the impact from the compressor, the compressor may collide with the refrigerant cylinder with the accumulator sandwiched therebetween. In general, the accumulator has a higher rigidity because a thermal insulator is not wound around the accumulator unlike the compressor and because the accumulator has a smaller diameter than the compressor. Accordingly, when the compressor collides successively with the refrigerant cylinder with the accumulator sandwiched therebetween in a state in which the center of the compressor, the center of the accumulator, and the center of the cylinder are aligned on a straight line, the impact from the compressor is applied to the refrigerant cylinder via the accumulator having a smaller diameter and a higher rigidity than the compressor. Thus, there is a concern that the cylinder may be damaged by the compressor colliding with the refrigerant cylinder with the accumulator sandwiched therebetween. As a result of damage to the refrigerant cylinder, the refrigerant may leak into the air. The successive collision referred to herein means that, after touching each other, the compressor and the accumulator are displaced together and then collide with the cylinder.

[0006] An object of the present disclosure is to prevent a cylinder from receiving a greater impact when a casing is dropped with a compressor located above the cylinder.SOLUTION TO THE PROBLEM

[0007] A first aspect is directed to a heat source apparatus. The heat source apparatus includes: a compressor (12) in a refrigerant circuit (11) that performs a refrigeration cycle; a cylinder (71) which is configured to store a flammable refrigerant for filling the refrigerant circuit (11) and which has a lower portion provided with a discharge port (711) through which the flammable refrigerant is discharged; an accumulator (17) connected to the compressor (12); and a casing (21) having a bottom plate (23) on which the compressor (12), the cylinder (71), and the accumulator (17) are installed, wherein in top view, an angle between a first virtual line (L1) connecting a center (12b) of the compressor (12) and a center (71b) of the cylinder (71) and a second virtual line (L2) connecting the center (12b) of the compressor (12) and a center (17b) of the accumulator (17) forms a predetermined angle (θ).

[0008] According to the first aspect, the first virtual line (L1) and the second virtual line (L2) form the predetermined angle (θ), whereby the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are not aligned on a straight line. Accordingly, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), the center (71b) of the cylinder (71) are aligned on a straight line, and then not all the impact which the accumulator (17) have received from the compressor (12) is allowed to be transmitted from the accumulator (17) to the cylinder (71). Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0009] A second aspect is an embodiment of the first aspect. In the second aspect, in the top view, the predetermined angle (θ) is an angle at which the accumulator (17) is not located on part (L11) of the first virtual line (L1) that is between the compressor (12) and the cylinder (71).

[0010] According to the second aspect, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line. Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0011] A third aspect is an embodiment of the first aspect. In the third aspect, in the top view, the predetermined angle (θ) is an angle at which the center (17b) of the accumulator (17) is located in a place separate from a region (M) located between the compressor (12) and the cylinder (71).

[0012] According to the third aspect, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line. Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0013] A fourth aspect is an embodiment of the first aspect. In the fourth aspect, in the top view, the predetermined angle (θ) is an angle at which the accumulator (17) is located in a place separate from a region (M) located between the compressor (12) and the cylinder (71).

[0014] According to the fourth aspect, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line. Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0015] A fifth aspect is an embodiment of the first aspect. In the fifth aspect, the predetermined angle (θ) is 90 degrees or more.

[0016] According to the fifth aspect, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line. Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0017] A sixth aspect is an embodiment of the third aspect. In the sixth aspect, in the top view, the predetermined angle (θ) is an angle at which part of the accumulator (17) that does not include the center (17b) of the accumulator (17) is located inside the region (M).

[0018] According to the sixth aspect, when falling down toward the cylinder (71), the compressor (12) touches the accumulator (17) before touching the cylinder (71), whereby it is possible to reduce the force by which the compressor (12) falls down.

[0019] A seventh aspect is an embodiment of any one of the first to sixth aspects. In the seventh aspect, a height of the accumulator (17) from the bottom plate (23) is greater than a height of the cylinder (71) from the bottom plate (23).

[0020] According to the seventh aspect, it is possible to prevent the accumulator (17) from colliding with a body portion (71d) of the cylinder (71) when the accumulator (17) falls down.

[0021] An eighth aspect is an embodiment of any one of the first to seventh aspects. In the eighth aspect, the heat source apparatus further includes a height adjustment member configured to define a height of a mount surface of the accumulator (17) from the bottom plate (23).

[0022] According to the eighth aspect, the accumulator (17) can be disposed so that the accumulator (17) is taller than the cylinder (71).BRIEF DESCRIPTION OF THE DRAWINGS

[0023] [FIG. 1] FIG. 1 is a schematic piping system diagram of a refrigerant circuit of a heat source apparatus of an embodiment. [FIG. 2] FIG. 2 is a schematic perspective view of an outdoor unit. [FIG. 3] FIG. 3 is a front view of the outdoor unit and shows that an access port on the front side of a machine chamber is opened. [FIG. 4] FIG. 4 is a schematic plan view of the inside of the outdoor unit. [FIG. 5] FIG. 5 is a right side view of the inside of the outdoor unit, where a side plate is removed. [FIG. 6] FIG. 6 shows the positional relation among a compressor, a cylinder, and an accumulator in top view. [FIG. 7] FIG. 7 shows the positional relation among the compressor, the cylinder, and the accumulator in top view. [FIG. 8] FIG. 8A and FIG. 8B show the compressor, the cylinder, and the accumulator, where a casing is dropped with the compressor located above the cylinder. [FIG. 9] FIG. 9A to FIG. 9C show the compressor, the cylinder, and the accumulator, where the casing is dropped with the compressor located above the cylinder. [FIG. 10] FIG. 10 shows that the compressor collides successively with the refrigerant cylinder with the accumulator sandwiched therebetween, in a state in which the casing is dropped with the compressor located above the cylinder, and the center of the compressor, the center of the accumulator, and the center of the cylinder are aligned on a straight line. DESCRIPTION OF EMBODIMENTS

[0024] Embodiments of the present disclosure will be described in detail below with reference to the drawings. The present disclosure is not limited to the embodiments shown below, and various changes can be made within the scope without departing from the technical concept of the present disclosure. Since each of the drawings is intended to illustrate the present disclosure conceptually, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for ease of understanding.(1) Basic Configuration of Heat Source Apparatus

[0025] A heat source apparatus (1) of this embodiment forms a refrigeration cycle apparatus that performs a refrigeration cycle. The refrigeration cycle apparatus is applied to a hot water supply apparatus. The heat source apparatus (1) heats water and supplies the heated water to target components. The heat source apparatus (1) has an outdoor unit (20) installed outdoors. The outdoor unit (20) has a casing (21). The casing (21) houses the entire part of a refrigerant circuit (11) which is a closed circuit. The refrigerant circuit (11) is filled with a refrigerant. The refrigerant circuit (11) performs a refrigeration cycle.

[0026] The refrigerant in the refrigerant circuit (11) is a flammable refrigerant. Specifically, the refrigerant in this embodiment is propane (R290), a natural refrigerant that is highly flammable. The natural refrigerant is a refrigerant which has an ozone depletion potential of zero and a low global warming potential and thus which has less impact on the environment. Propane ignites at 500°C or less.

[0027] The flammable refrigerant may be methane (R50), ethane (R170), butane (R600), or isobutane (R600a). The natural refrigerant may be a corrosive refrigerant such as ammonia (R717).(1-1) Refrigerant Circuit

[0028] As shown in FIG. 1, the refrigerant circuit (11) has a compressor (12), an air heat exchanger (13), an expansion valve (14), a water heat exchanger (15), and a cylinder (71) as main components. The refrigerant circuit (11) further has a four-way switching valve (16) and an accumulator (17).

[0029] The compressor (12) compresses a refrigerant. The discharge side of the compressor (12) is connected with a discharge pipe (18), and the suction side of the compressor (12) is connected with a suction pipe (19). The air heat exchanger (13) exchanges heat between a refrigerant and outdoor air. The expansion valve (14) decompresses a refrigerant. The water heat exchanger (15) exchanges heat between a refrigerant in the refrigerant circuit (11) and water in a water circuit (40). The four-way switching valve (16) switches the direction in which a refrigerant circulates. The four-way switching valve (16) switches between a first state in which a first port (16a) and a third port (16c) communicate with each other and a second port (16b) and a fourth port (16d) communicate with each other (the state indicated by the solid lines in FIG. 1) and a second state in which the first port (16a) and the second port (16b) communicate with each other and the third port (16c) and the fourth port (16d) communicate with each other (the state indicated by the broken lines in FIG. 1). The accumulator (17) stores liquid contained in a refrigerant sucked into the compressor (12).

[0030] The cylinder (71) is connected to the refrigerant circuit (11) via a connection pipe (72). The connection pipe (72) of this embodiment is connected to the suction pipe (19). The connection pipe (72) is provided with a control valve (73). The cylinder (71) is filled with a refrigerant before the heat source apparatus (1) is shipped out. After the heat source apparatus (1) has been transported to a site, an operator decompresses the refrigerant circuit (11). Then, when the operator opens the control valve (73), the refrigerant in the cylinder (71) is allowed to fill the refrigerant circuit (11).

[0031] The refrigerant circuit (11) performs a first refrigeration cycle and a second refrigeration cycle. In FIG. 1, the flow of a refrigerant in the first refrigeration cycle is indicated by the solid arrow, and the flow of a refrigerant in the second refrigeration cycle is indicated by the broken arrow. In the first refrigeration cycle, the four-way switching valve (16) is in the first state, where the water heat exchanger (15) functions as a radiator (a condenser) and the air heat exchanger (13) functions as an evaporator. In the second refrigeration cycle, the four-way switching valve (16) is in the second state, where the air heat exchanger (13) functions as a radiator (a condenser) and the water heat exchanger (15) functions as an evaporator.(1-2) Water Circuit

[0032] The water circuit (40) is connected to the water heat exchanger (15). The water circuit (40) includes a first water pipe (41) upstream of the water heat exchanger (15) and a second water pipe (42) downstream of the water heat exchanger (15). The water circuit (40) is connected with a pump (43). The pump (43) transports water in the water circuit (40). The water in the water circuit (40) is supplied to target components such as a boiler tank, an air-conditioning unit, and a floor heating unit. The water circuit (40) is connected with a gas-liquid separator (44). The gas-liquid separator (44) discharges to the atmosphere the refrigerant that has leaked from the refrigerant circuit (11) to the water circuit (40) via the water heat exchanger (15).(2) Outdoor Unit

[0033] The configuration of the outdoor unit (20) will be described in detail with reference to FIGS. 2 to 5. In the following description, the terms for the directions such as "top", "bottom", "right", "left", "front", and "back" refer to the directions of the arrows in FIG. 2. The outdoor unit (20) has the casing (21), components of the refrigerant circuit (11), and components of the water circuit (40). In addition to the elements described above, the components of the refrigerant circuit (11) include a refrigerant pipe, an electromagnetic valve, an internal heat exchanger, a filter, a thermal insulator for piping, and the like. The outdoor unit (20) has a partitioning member (45) that partitions the casing (21), and a fan (30) that transports the outdoor air.(2-1) Casing and Partitioning Member

[0034] The casing (21) is installed outdoors. The casing (21) is formed in a hollow box shape. More precisely, the casing (21) is formed in a box shape of which the left surface and the rear surface are opened partially. The casing (21) is formed in a rectangular parallelepiped shape of which the longitudinal direction is the first direction (the left-right direction) and the lateral direction is the second direction (the front-back direction). The casing (21) is comprised of metallic plate members. The casing (21) has a top plate (22), a bottom plate (23), a right plate (24), a left plate (25), a front plate (26), and a rear plate (27). The top plate (22) forms the upper surface of the casing (21), the bottom plate (23) forms the lower surface of the casing (21), the right plate (24) forms the right surface of the casing (21), the left plate (25) forms the left surface of the casing (21), the front plate (26) forms the front surface of the casing (21), and the rear plate (27) forms the rear surface of the casing (21). The left plate (25) is located in the front side of the casing (21) and is continuous with the front plate (26). The rear plate (27) is located in the right side of the casing (21) and is continuous with the right plate (24).

[0035] The partitioning member (45) is provided in the casing (21). The partitioning member (45) extends from the bottom plate (23) to the top plate (22). The partitioning member (45) extends in the front-back direction in top view. The partitioning member (45) in top view may be formed in a curved shape or a bent shape, or may be formed in a curve line. The partitioning member (45) partitions the inside of the casing (21) into a fan chamber (S1) as a first chamber and a machine chamber (S2) as a second chamber. The fan chamber (S1) is formed on the left side of the casing (21), and the machine chamber (S2) is formed on the right side of the casing (21).

[0036] The casing (21) has an inlet port (28) and an outlet port (29). The inlet port (28) is formed in part of the casing (21) that is from the rear surface to the left surface of the fan chamber (S1). The outlet port (29) is formed in part of the front plate (26) of the casing (21) that is in a front part of the fan chamber (S1). In the fan chamber (S1), a flow path in which the outdoor air flows is formed from the inlet port (28) to the outlet port (29). The casing (21) includes a side surface (21a), and in this embodiment, the cylinder (71) is located closer to the side surface (21a) than the compressor (12) is.(2-2) Configuration of Fan Chamber

[0037] The fan chamber (S1) is a substantially rectangular parallelepiped space. The length of the fan chamber (S1) in the first direction is greater than the length in the second direction. The fan chamber (S1) is provided with the air heat exchanger (13), the fan (30), and a bell mouth (31).

[0038] The air heat exchanger (13) is formed in an L-shape in top view. The air heat exchanger (13) has a first heat exchange portion (13a) along the rear surface of the fan chamber (S1) and a second heat exchange portion (13b) along the left surface of the fan chamber (S1). The air heat exchanger (13) is a fin-and-tube heat exchanger. A heat transfer tube of the air heat exchanger (13) is a multi-bored flat tube, but may be a straight tube.

[0039] The fan (30) is a propeller fan which has a motor (30a) and an impeller (30b). The motor (30a) is located behind the impeller (30b). The motor (30a) is supported by a support base (32) installed on the bottom plate (23). The motor (30a) drives and rotates the impeller (30b). The bell mouth (31) is in a tubular shape formed around the impeller (30b). The bell mouth (31) is continuous with the outlet port (29).

[0040] Part of the air heat exchanger (13) of this embodiment extends to the machine chamber (S2). The first heat exchange portion (13a) is located behind the partitioning member (45). The first heat exchange portion (13a) extends in the right direction to pass through a space behind a rear end portion of the partitioning member (45). A right end portion of the first heat exchange portion (13a) is located in the machine chamber (S2).(3) Configuration of Machine Chamber

[0041] The machine chamber (S2) is a substantially rectangular parallelepiped space. The length of the machine chamber (S2) in the first direction is substantially equal to the length in the second direction. The length of the machine chamber (S2) in the third direction (the top-bottom direction) is greater than the lengths in the first direction and the second direction. The length of the machine chamber (S2) in the first direction is smaller than the length of the fan chamber (S1) in the first direction. The compressor (12), the water heat exchanger (15), the gas-liquid separator (44), and the accumulator (17) are disposed in the machine chamber (S2). The outdoor unit (20) further includes a vibration reduction mechanism (50), a sound insulation member (60), and a filling unit (70). In this embodiment, the first direction, the second direction, and the third direction are perpendicular to one another; the first direction and the second direction are parallel to the horizontal direction; and the third direction is parallel to the vertical direction. In this embodiment, the first direction is the left-right direction; the second direction is the front-back direction; and the third direction is the top-bottom direction. In other words, the third direction is the direction in which the gravity acts (the gravity direction).(3-1) Compressor

[0042] The compressor (12) is disposed in the front side and in the left side of the machine chamber (S2). The compressor (12) has a compressor casing (12a) that is formed in a cylindrical shape. The compressor casing (12a) is formed in a vertically-long hollow cylindrical shape of which the height is greater than the outer diameter. The compressor casing (12a) forms a hermetically-closed pressure-resistant container. A top portion of the compressor casing (12a) is connected with the suction pipe (19). The compressor casing (12a) is connected with the discharge pipe (18). A thermal insulator (not shown) is wound around the compressor (12). The compressor (12) is, for example, a scroll compressor. In the compressor casing (12a), a compression mechanism (12d) is provided which includes an orbiting scroll and a fixed scroll and which compresses a refrigerant in a compression chamber formed between the orbiting scroll and the fixed scroll.(3-2) Water Heat Exchanger

[0043] The water heat exchanger (15) is disposed in the right side of the machine chamber (S2). The water heat exchanger (15) is closer to the right plate (24) than the compressor (12) is. The water heat exchanger (15) is closer to the rear plate (27) than the compressor (12) is. The water heat exchanger (15) is a plate heat exchanger. The water heat exchanger (15) is connected with the first water pipe (41), the second water pipe (42), and a refrigerant pipe (not shown).(3-3) Gas-Liquid Separator

[0044] The gas-liquid separator (44) is disposed above the water heat exchanger (15). The gas-liquid separator (44) is supported from below by the water heat exchanger (15). The gas-liquid separator (44) is provided with a release path that releases a gas refrigerant separated in the gas-liquid separator (44) and a gas vent valve that opens and closes the release path (not shown).(3-4) Accumulator

[0045] The accumulator (17) is connected to the suction pipe (19). The accumulator (17) is disposed in the rear side of the machine chamber (S2). The accumulator (17) is closer to the rear plate (27) than the compressor (12) and the water heat exchanger (15) are. The accumulator (17) is formed in a vertically-long hollow cylindrical shape of which the height is greater than the outer diameter. The outer diameter of the accumulator (17) is smaller than the outer diameter of the compressor (12). The rigidity of the accumulator (17) (the rigidity of the casing of the accumulator (17)) is greater than the rigidity of the compressor (12) (the rigidity of the compressor casing (12a)). In this embodiment, no thermal insulator is wound around the accumulator (17).(3-5) Vibration Reduction Mechanism

[0046] The vibration reduction mechanism (50) reduces vibration of the compressor (12) and the accumulator (17). The vibration reduction mechanism (50) of this embodiment has a support plate (51) that supports the compressor (12) from below and an elastic support portion (52) that is fixed on the bottom plate (23) and supports the support plate (51) from below.

[0047] The compressor (12) is fixed on the support plate (51). The support plate (51) is a plate member which has a substantially triangular shape in top view. A circular hole into which a bottom portion of the compressor (12) is fitted is formed in the center of the support plate (51).

[0048] The vibration reduction mechanism (50) of this embodiment has three elastic support portions (52). The elastic support portion (52) is disposed on or around each of the three top portions of the support plate (51). The elastic support portion (52) is disposed between the support plate (51) and the bottom plate (23). The elastic support portion (52) directly supports the support plate (51) from below. The elastic support portion (52) is made of rubber or urethane. The vibration of the compressor (12) is reduced by the elastic support portion (52) before being transmitted to the bottom plate (23).

[0049] In this embodiment, the cylinder (71) of the filling unit (70) is not supported by the support plate (51) and is fixed on the bottom plate (23).(3-6) Sound Insulation Member

[0050] The sound insulation member (60) reduces propagation of the noise generated when the compressor (12) is operating to the outside of the casing (21). The sound insulation member (60) is formed in a hollow box shape which is opened downward. The sound insulation member (60) has an upper wall (61), a right wall (62), a left wall (63), a front wall (64), and a rear wall (65). The upper wall (61) faces the top plate (22) and forms the upper surface of the sound insulation member (60). The right wall (62) faces the right plate (24) and forms the right surface of the sound insulation member (60). The left wall (63) faces the partitioning member (45) and forms the left surface of the sound insulation member (60). The front wall (64) faces the front plate (26) and forms the front surface of the sound insulation member (60). The rear wall (65) faces the rear plate (27) and forms the rear surface of the sound insulation member (60). The front wall (64) is attachable to and detachable from the body of the sound insulation member (60).

[0051] The sound insulation member (60) is supported by the bottom plate (23) of the casing (21). The sound insulation member (60) is a non-porous member. The sound insulation member (60) is comprised of, for example, metallic plate members or rubber sheets.

[0052] The sound insulation member (60) forms an internal space (66) in which the compressor (12) is housed. The components such as the compressor (12), the accumulator (17), the water heat exchanger (15), and the filling unit (70) are disposed in the internal space (66) of this embodiment.

[0053] The sound insulation member (60) and the casing (21) are spaced apart from each other with a predetermined gap. In other words, a clearance (67) is formed between the outer surface of the sound insulation member (60) and the inner surface of the casing (21). The clearance (67) reduces propagation of the noise generated when the compressor (12) is operating to the outside of the casing (21).(3-7) Filling Unit

[0054] The filling unit (70) is disposed in the right side of the machine chamber (S2) and in the front side of the machine chamber (S2). The filling unit (70) has the cylinder (71), the connection pipe (72), the control valve (73), and a protection member (74).

[0055] The cylinder (71) stores a flammable refrigerant for filling the refrigerant circuit (11). The cylinder (71) is filled with a refrigerant in advance when the heat source apparatus (1) is shipped out. Thus, when the heat source apparatus (1) is stored or transported, the cylinder (71) stores a refrigerant. After the heat source apparatus (1) has been installed on a site, the refrigerant circuit (11) is filled with a refrigerant from the cylinder (71) before the heat source apparatus (1) starts operation. Accordingly, when the heat source apparatus (1) is in use, the cylinder (71) is empty.

[0056] The cylinder (71) is formed in a vertically-long hollow cylindrical shape of which the height is greater than the outer diameter. The cylinder (71) forms a hermetically-closed pressure-resistant container. The rigidity of the cylinder (71) is smaller than the rigidity of the compressor casing (12a).

[0057] As shown in FIG. 1 and FIG. 3, a discharge port (711) is formed in a lower portion of the cylinder (71). More precisely, the discharge port (711) is formed in a bottom portion of the cylinder (71). A flammable refrigerant has a relatively high density. The discharge port (711) disposed in a lower portion of the cylinder (71) can induce a refrigerant to discharge. In addition, when loading a refrigerant into the refrigerant circuit (11), it is possible to reduce the remains of the refrigerant in the cylinder (71).

[0058] The connection pipe (72) is a pipe through which a refrigerant in the cylinder (71) is injected into the refrigerant circuit (11). One end of the connection pipe (72) is connected to the bottom portion of the cylinder (71) and communicates with the inside of the cylinder (71). The other end of the connection pipe (72) is connected to the suction pipe (19). The connection pipe (72) is located below the cylinder (71).

[0059] The control valve (73) is provided in the connection pipe (72). The control valve (73) controls the opening degree of the connection pipe (72). The control valve (73) is an exemplary on-off valve that opens and closes the connection pipe (72). The control valve (73) is located below the cylinder (71).

[0060] The protection member (74) has a function of protecting the connection pipe (72) and the control valve (73). The protection member (74) further has a function of supporting the cylinder (71) from below. The protection member (74) is installed between the cylinder (71) and the upper surface (23a) of the bottom plate (23). The upper surface (23a) of the bottom plate (23) means the upper surface (23a) of the bottom plate (23) in the vertical direction. The protection member (74) has a partition wall (74a) surrounding the connection pipe (72) and the control valve (73) and an adjustment member (74c). The partition wall (74a) has an opening (74b) through which the control valve (73) inside the partition wall (74a) is exposed to the outside of the partition wall (74a).

[0061] The adjustment member (74c) is, for example, a metallic member, and includes a leg portion (74c1) and a top plate portion (74c2). The leg portion (74c1) extends along the top-bottom direction. The lower ends of the leg portions (74c1) are fixed to the bottom plate (23). The top plate portion (74c2) is fixed to the upper end of the leg portion (74c1). The cylinder (71) is mounted on an upper surface of the top plate portion (74c2), and this upper surface functions as a mount surface of the cylinder (71). If the length of the leg portion (74c1) is changed, the height from the bottom plate (23) to the upper surface of the top plate portion (74c2) is changed. For example, the length of the leg portion (74c1) of the adjustment member (74c) may be changed by replacing an originally-installed leg portion (74c1) with a leg portion (74c1) which has a different length. In this case, only the leg portion (74c1) may be replaced, or the adjustment member (74c) including the leg portion (74c1) and the top panel portion (74c2) may be replaced. Further, for example, the leg portion (74c1) may include a first rod and a second rod slidably coupled in the top-bottom direction, and the length of the leg portion (74c1) may be changed by changing the sliding amount of the second rod relative to the first rod. Thus, the adjustment member (74c) functions as a height adjustment member that defines the height of the mount surface of the cylinder (71) from the bottom plate (23).(3-8) Access Port

[0062] As shown in FIGS. 3 and 4, an access port (A) is formed in the front side of the casing (21). The front plate (26) is provided with a front panel (26a) that is attachable to and detachable from a body of the front plate (26). When the front panel (26a) is detached, the access port (A) is exposed to the outside of the casing (21). When the front wall (64) is detached from the sound insulation member (60), the components in the casing (21) are exposed to the outside of the casing (21). The compressor (12) and the cylinder (71) overlap with the access port (A) in the second direction. The operator in front of the casing (21) can access the compressor (12) and the cylinder (71) through the access port (A). The operator can do maintenance on the compressor (12) and can operate the control valve (73) through the opening (74b).(4) Features of Positional Relation among Accumulator, Compressor, and Refrigerant Cylinder

[0063] As shown in FIG. 6, in top view (as viewed from above in the vertical direction), the angle (α) between the first virtual line (L1) and the second virtual line (L2) forms a predetermined angle (θ). The first virtual line (L1) is the virtual line that connects the center (12b) of the compressor (12) and the center (71b) of the cylinder (71). The second virtual line (L2) is the virtual line that connects the center (12b) of the compressor (12) and the center (17b) of the accumulator (17). In top view, the center (12b) of the compressor (12) is the center of the outer periphery of the casing of the compressor (12) (the compressor casing (12a)) that is formed in a substantially circular shape. In top view, the center (71b) of the cylinder (71) is the center of the outer periphery of the casing (71a) of the cylinder (71) that is formed in a substantially circular shape. In top view, the center (17b) of the accumulator (17) is the center of the outer periphery of the casing (17a) of the accumulator (17) that is formed in a substantially circular shape. The angle (α) between the first virtual line (L1) and the second virtual line (L2) is the smaller one of the two angles between the first virtual line (L1) and the second virtual line (L2).

[0064] As shown in FIG. 7, in top view, the predetermined angle (θ) is an angle at which the center (17b) of the accumulator (17) is located in a place separate from a region (M) located between the compressor (12) and the cylinder (71). In top view, the region (M) is a region defined by the compressor (12), the cylinder (71), and two common tangent lines (N1, N2) among the common tangent lines of the outer periphery of the compressor casing (12a) and the outer periphery of the casing (71a) of the cylinder (71) that do not intersect with the first virtual line (L1).

[0065] In general, a thermal insulator is not wound around the accumulator (17) unlike the compressor (12). Also, the accumulator (17) has a smaller diameter and a higher rigidity than the compressor (12). Thus, if the accumulator (17) collides with the cylinder (71), the cylinder (71) is likely to receive a greater impact.

[0066] In this embodiment, in top view, the angle (α) between the first virtual line (L1) and the second virtual line (L2) is configured to form the predetermined angle (θ), whereby the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are not aligned on a straight line. Thus, as shown in FIG. 8A and FIG. 8B, if the compressor (12) is detached from the bottom plate (23) (or the support plate (51)) and then the compressor (12) is displaced toward the cylinder (71), for example, due to the impact generated by the casing (21) being dropped and coming into contact with the ground (the casing (21) is dropped while the compressor (12) is located above the cylinder (71)), and if the accumulator (17) is not located in the region (M), the compressor (12) collides with the cylinder (71) without colliding with the cylinder (71), and thus it is possible to prevent the accumulator (17) from colliding with the cylinder (71). That is, as shown in FIG. 10, the compressor (12) collides indirectly with the cylinder (71) with the accumulator (17) sandwiched therebetween, whereby it is possible to prevent the accumulator (17) from colliding with the cylinder (71). Accordingly, for example, since the accumulator (17) has a higher rigidity than the compressor (12), the cylinder (71) receives a smaller impact when the compressor (12) directly collides with the cylinder (71) than when the accumulator (17) directly collides with the cylinder (71). Thus, it is possible to prevent the cylinder (71) from receiving a greater impact. The arrow Z in the figure indicates the direction in which the casing (21) is dropped when the casing (21) is dropped with the side surface (21a) ahead.

[0067] Also, as shown in FIG. 9A, if the center (17b) of the accumulator (17) is not located in the region (M) but part of the accumulator (17) is located in the region (M), the compressor (12) collides with the accumulator (17) when being displaced toward the cylinder (71) due to the impact caused by the casing (21) being dropped. Accordingly, the accumulator (17) as well as the compressor (12) is displaced, and as shown in FIG. 9B and FIG. 9C, the accumulator (17) collides with the cylinder (71). However, the accumulator (17) collides with the cylinder (71) not in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line (see FIG. 10), but, as shown in FIG. 9B or FIG. 9C, in a state in which the center (17b) of the accumulator (17) is displaced from the first virtual line (L1) that connects the center (12b) of the compressor (12) and the center (71b) of the cylinder (71). In the state shown in FIG. 9B, in a state in which the center (17b) of the accumulator (17) is displaced from the first virtual line (L1), the accumulator (17) collides with the cylinder (71), and also the compressor (12) collides with the cylinder (71). In the case shown in FIG. 9B, part of the impact (F) transmitted from the compressor (12) to the accumulator (17) (the force transmitted from the compressor (12)) acts in the direction perpendicular to the direction in which the force is transmitted from the accumulator (17) to the cylinder (71). Thus, the force acting from the accumulator (17) to the cylinder (71) is reduced. In the case shown in FIG. 9B, while the compressor (12) collides with the cylinder (71), the compressor (12) collides with the accumulator (17) so that the momentum of the compressor (12) is lowered. Thus, it is possible to prevent the cylinder (71) from receiving a greater impact. In the case shown in FIG. 9C, while the compressor (12) collides with the cylinder (71) with the accumulator (17) sandwiched therebetween, the impact (F) transmitted from the compressor (12) to the accumulator (17) is separated into the component (F1) transmitted to the cylinder (71) and the component (F2) trasnsmitted in the direction in which the component (F2) escapes from the cylinder (71). Thus, not all the impact (F) which the accumulator (17) have received from the compressor (12) when colliding with the compressor (12) is allowed to be transmitted from the accumulator (17) to the cylinder (71), and it is possible to separately distribute the component (F2) of the impact in the direction in which the component (F2) escapes from the cylinder (71) (the direction in which the component (F2) is separate from the first virtual line (L1)). Thus, it is possible to prevent the accumulator (17) from receiving a greater impact from the cylinder (71). As a result, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the cylinder (71) from receiving a greater impact.

[0068] As shown in FIG. 7, in top view, the predetermined angle (θ) may be an angle at which the accumulator (17) (the entire part of the accumulator (17)) is located in a place separate from the region (M) located between the compressor (12) and the cylinder (71). Also, the predetermined angle (θ) may be 90 degrees or more. Thus, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), the compressor (12) collides with the cylinder (71), and the accumulator (17) does not collide with the cylinder (71). Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0069] Also, in top view, the predetermined angle (θ) may be an angle at which the accumulator (17) (the entire part of the accumulator (17)) is not located on part (L11) of the first virtual line (L1) that is between the compressor (12) and the cylinder (71) (see FIG. 6). In other words, in top view, the predetermined angle (θ) may be an angle at which the accumulator (17) is located in a place separate from the first virtual line (L1). According to this configuration, even when the casing (21) is dropped with the compressor (12) located above the cylinder (71) so that the compressor (12) collides with the cylinder (71) with the accumulator (17) sandwiched therebetween, it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line as shown in FIG. 10. Then, the components are distributed as shown in FIG. 9B or FIG. 9C, and thus it is possible to prevent the cylinder (71) from receiving a greater impact.

[0070] Also, as shown in FIG. 9A, the predetermined angle (θ) may be an angle at which the center (17b) of the accumulator (17) is located outside the region (M) and part of the accumulator (17) that does not include the center (17b) of the accumulator (17) is located inside the region (M). Thus, when falling down toward the cylinder (71), the compressor (12) touches the accumulator (17) before touching the cylinder (71), whereby it is possible to reduce the force by which the compressor (12) falls down.(5) Variations

[0071] The height of the accumulator (17) from the bottom plate (23) may be greater than the height of the cylinder (71) from the bottom plate (23). Thus, for example, even if the accumulator (17) falls toward the cylinder (71) due to the impact generated by the casing (21) being dropped and touching the ground, a body portion (17c) of the accumulator (17) collides with an upper portion (71c) of the cylinder (71). As a result, it is possible to prevent the accumulator (17) from colliding with a body portion (71d) of the cylinder (71) that is more fragile than both the upper end portion and the lower end portion, and thus it is possible to reduce damage to the cylinder (71). The body portion (71d) of the cylinder (71) is a vertically central part of the cylinder (71).

[0072] The heat source apparatus (1) may include a height adjustment member configured to define the height of the mount surface of the accumulator (17) from the bottom plate (23). The height adjustment member is disposed between the bottom plate (23) and the accumulator (17). For example, the height adjustment member is a metallic member, and includes a top plate portion that includes the mount surface of the accumulator (17) and a leg portion that is disposed between the top plate portion and the bottom plate (23). If the length of the leg portion is changed, the height from the bottom plate (23) to the mount surface of the top plate portion is changed. For example, the length of the leg portion of the height adjustment member may be changed by replacing an originally-installed leg portion with a leg portion which has a different length. In this case, only the leg portion may be replaced, or the height adjustment member itself may be replaced. Further, for example, the leg portion may include a first rod and a second rod slidably coupled in the top-bottom direction, and the length of the leg portion may be changed by changing the sliding amount of the second rod relative to the first rod. Thus, the height adjustment member can define the height of the mount surface of the accumulator (17) from the bottom plate (23). As a result, the accumulator (17) can be disposed so that the height of the accumulator (17) from the bottom plate (23) is greater than the height of the cylinder (71) from the bottom plate (23).

[0073] It will be understood that the embodiments and variations described above can be modified with various changes in form and details without departing from the spirit and scope of the claims. The elements according to embodiments, the variations thereof, and the other embodiments may be combined and replaced with each other. In addition, the expressions of "first," "second," "third," . . . , in the specification and claims are used to distinguish the terms to which these expressions are given, and do not limit the number and order of the terms.INDUSTRIAL APPLICABILITY

[0074] As described above, the present disclosure is useful for a heat source apparatus.DESCRIPTION OF REFERENCE CHARACTERS

[0075] 1Heat Source Apparatus 11Refrigerant Circuit 12Compressor 12bCenter of Compressor 17Accumulator 17bCenter of Accumulator 21Casing 23Bottom Plate 71Cylinder 71bCenter of Cylinder L1First Virtual Line L2Second Virtual Line θPredetermined Angle

Examples

Embodiment Construction

[0024]Embodiments of the present disclosure will be described in detail below with reference to the drawings. The present disclosure is not limited to the embodiments shown below, and various changes can be made within the scope without departing from the technical concept of the present disclosure. Since each of the drawings is intended to illustrate the present disclosure conceptually, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for ease of understanding.

(1) Basic Configuration of Heat Source Apparatus

[0025]A heat source apparatus (1) of this embodiment forms a refrigeration cycle apparatus that performs a refrigeration cycle. The refrigeration cycle apparatus is applied to a hot water supply apparatus. The heat source apparatus (1) heats water and supplies the heated water to target components. The heat source apparatus (1) has an outdoor unit (20) installed outdoors. The outdoor unit (20) has a casing (21). The casing (21) houses the entire part ...

TECHNICAL FIELD

[0001] The present disclosure relates to a heat source apparatus.BACKGROUND ART

[0002] Patent Document 1 discloses a heat source apparatus that includes a compressor and an accumulator which are connected to a refrigerant circuit. The compressor is installed on a bottom plate in a casing of the heat source apparatus.CITATION LISTPATENT DOCUMENT

[0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2013-155921SUMMARY OF THE INVENTIONTECHNICAL PROBLEM

[0004] The inventors of the present application have created a configuration in which a refrigerant cylinder is provided in the casing of the heat source apparatus. The refrigerant cylinder stores a refrigerant for filling the refrigerant circuit. Thus, when the heat source apparatus is installed, the refrigerant circuit can be filled with the refrigerant from the refrigerant cylinder, and thus it is unnecessary to separately prepare a refrigerant for filling the circuit. On the other hand, when the refrigerant cylinder is provided in the casing, the following specific problems arise.

[0005] When the heat source apparatus is transported before being installed on a site, there is a risk that the casing is dropped. Here, the compressor, the refrigerant cylinder, and the accumulator are provided in the casing. When the casing is dropped toward the ground, the casing may touch the ground in a state in which a side of the bottom plate is oriented along the ground. In this case, when the compressor is displaced and collides with the accumulator due to the impact by the casing being dropped, and the accumulator is displaced due to the impact from the compressor, the compressor may collide with the refrigerant cylinder with the accumulator sandwiched therebetween. In general, the accumulator has a higher rigidity because a thermal insulator is not wound around the accumulator unlike the compressor and because the accumulator has a smaller diameter than the compressor. Accordingly, when the compressor collides successively with the refrigerant cylinder with the accumulator sandwiched therebetween in a state in which the center of the compressor, the center of the accumulator, and the center of the cylinder are aligned on a straight line, the impact from the compressor is applied to the refrigerant cylinder via the accumulator having a smaller diameter and a higher rigidity than the compressor. Thus, there is a concern that the cylinder may be damaged by the compressor colliding with the refrigerant cylinder with the accumulator sandwiched therebetween. As a result of damage to the refrigerant cylinder, the refrigerant may leak into the air. The successive collision referred to herein means that, after touching each other, the compressor and the accumulator are displaced together and then collide with the cylinder.

[0006] An object of the present disclosure is to prevent a cylinder from receiving a greater impact when a casing is dropped with a compressor located above the cylinder.SOLUTION TO THE PROBLEM

[0007] A first aspect is directed to a heat source apparatus. The heat source apparatus includes: a compressor (12) in a refrigerant circuit (11) that performs a refrigeration cycle; a cylinder (71) which is configured to store a flammable refrigerant for filling the refrigerant circuit (11) and which has a lower portion provided with a discharge port (711) through which the flammable refrigerant is discharged; an accumulator (17) connected to the compressor (12); and a casing (21) having a bottom plate (23) on which the compressor (12), the cylinder (71), and the accumulator (17) are installed, wherein in top view, an angle between a first virtual line (L1) connecting a center (12b) of the compressor (12) and a center (71b) of the cylinder (71) and a second virtual line (L2) connecting the center (12b) of the compressor (12) and a center (17b) of the accumulator (17) forms a predetermined angle (θ).

[0008] According to the first aspect, the first virtual line (L1) and the second virtual line (L2) form the predetermined angle (θ), whereby the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are not aligned on a straight line. Accordingly, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), the center (71b) of the cylinder (71) are aligned on a straight line, and then not all the impact which the accumulator (17) have received from the compressor (12) is allowed to be transmitted from the accumulator (17) to the cylinder (71). Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0009] A second aspect is an embodiment of the first aspect. In the second aspect, in the top view, the predetermined angle (θ) is an angle at which the accumulator (17) is not located on part (L11) of the first virtual line (L1) that is between the compressor (12) and the cylinder (71).

[0010] According to the second aspect, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line. Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0011] A third aspect is an embodiment of the first aspect. In the third aspect, in the top view, the predetermined angle (θ) is an angle at which the center (17b) of the accumulator (17) is located in a place separate from a region (M) located between the compressor (12) and the cylinder (71).

[0012] According to the third aspect, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line. Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0013] A fourth aspect is an embodiment of the first aspect. In the fourth aspect, in the top view, the predetermined angle (θ) is an angle at which the accumulator (17) is located in a place separate from a region (M) located between the compressor (12) and the cylinder (71).

[0014] According to the fourth aspect, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line. Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0015] A fifth aspect is an embodiment of the first aspect. In the fifth aspect, the predetermined angle (θ) is 90 degrees or more.

[0016] According to the fifth aspect, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line. Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0017] A sixth aspect is an embodiment of the third aspect. In the sixth aspect, in the top view, the predetermined angle (θ) is an angle at which part of the accumulator (17) that does not include the center (17b) of the accumulator (17) is located inside the region (M).

[0018] According to the sixth aspect, when falling down toward the cylinder (71), the compressor (12) touches the accumulator (17) before touching the cylinder (71), whereby it is possible to reduce the force by which the compressor (12) falls down.

[0019] A seventh aspect is an embodiment of any one of the first to sixth aspects. In the seventh aspect, a height of the accumulator (17) from the bottom plate (23) is greater than a height of the cylinder (71) from the bottom plate (23).

[0020] According to the seventh aspect, it is possible to prevent the accumulator (17) from colliding with a body portion (71d) of the cylinder (71) when the accumulator (17) falls down.

[0021] An eighth aspect is an embodiment of any one of the first to seventh aspects. In the eighth aspect, the heat source apparatus further includes a height adjustment member configured to define a height of a mount surface of the accumulator (17) from the bottom plate (23).

[0022] According to the eighth aspect, the accumulator (17) can be disposed so that the accumulator (17) is taller than the cylinder (71).BRIEF DESCRIPTION OF THE DRAWINGS

[0023] [FIG. 1] FIG. 1 is a schematic piping system diagram of a refrigerant circuit of a heat source apparatus of an embodiment. [FIG. 2] FIG. 2 is a schematic perspective view of an outdoor unit. [FIG. 3] FIG. 3 is a front view of the outdoor unit and shows that an access port on the front side of a machine chamber is opened. [FIG. 4] FIG. 4 is a schematic plan view of the inside of the outdoor unit. [FIG. 5] FIG. 5 is a right side view of the inside of the outdoor unit, where a side plate is removed. [FIG. 6] FIG. 6 shows the positional relation among a compressor, a cylinder, and an accumulator in top view. [FIG. 7] FIG. 7 shows the positional relation among the compressor, the cylinder, and the accumulator in top view. [FIG. 8] FIG. 8A and FIG. 8B show the compressor, the cylinder, and the accumulator, where a casing is dropped with the compressor located above the cylinder. [FIG. 9] FIG. 9A to FIG. 9C show the compressor, the cylinder, and the accumulator, where the casing is dropped with the compressor located above the cylinder. [FIG. 10] FIG. 10 shows that the compressor collides successively with the refrigerant cylinder with the accumulator sandwiched therebetween, in a state in which the casing is dropped with the compressor located above the cylinder, and the center of the compressor, the center of the accumulator, and the center of the cylinder are aligned on a straight line. DESCRIPTION OF EMBODIMENTS

[0024] Embodiments of the present disclosure will be described in detail below with reference to the drawings. The present disclosure is not limited to the embodiments shown below, and various changes can be made within the scope without departing from the technical concept of the present disclosure. Since each of the drawings is intended to illustrate the present disclosure conceptually, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for ease of understanding.(1) Basic Configuration of Heat Source Apparatus

[0025] A heat source apparatus (1) of this embodiment forms a refrigeration cycle apparatus that performs a refrigeration cycle. The refrigeration cycle apparatus is applied to a hot water supply apparatus. The heat source apparatus (1) heats water and supplies the heated water to target components. The heat source apparatus (1) has an outdoor unit (20) installed outdoors. The outdoor unit (20) has a casing (21). The casing (21) houses the entire part of a refrigerant circuit (11) which is a closed circuit. The refrigerant circuit (11) is filled with a refrigerant. The refrigerant circuit (11) performs a refrigeration cycle.

[0026] The refrigerant in the refrigerant circuit (11) is a flammable refrigerant. Specifically, the refrigerant in this embodiment is propane (R290), a natural refrigerant that is highly flammable. The natural refrigerant is a refrigerant which has an ozone depletion potential of zero and a low global warming potential and thus which has less impact on the environment. Propane ignites at 500°C or less.

[0027] The flammable refrigerant may be methane (R50), ethane (R170), butane (R600), or isobutane (R600a). The natural refrigerant may be a corrosive refrigerant such as ammonia (R717).(1-1) Refrigerant Circuit

[0028] As shown in FIG. 1, the refrigerant circuit (11) has a compressor (12), an air heat exchanger (13), an expansion valve (14), a water heat exchanger (15), and a cylinder (71) as main components. The refrigerant circuit (11) further has a four-way switching valve (16) and an accumulator (17).

[0029] The compressor (12) compresses a refrigerant. The discharge side of the compressor (12) is connected with a discharge pipe (18), and the suction side of the compressor (12) is connected with a suction pipe (19). The air heat exchanger (13) exchanges heat between a refrigerant and outdoor air. The expansion valve (14) decompresses a refrigerant. The water heat exchanger (15) exchanges heat between a refrigerant in the refrigerant circuit (11) and water in a water circuit (40). The four-way switching valve (16) switches the direction in which a refrigerant circulates. The four-way switching valve (16) switches between a first state in which a first port (16a) and a third port (16c) communicate with each other and a second port (16b) and a fourth port (16d) communicate with each other (the state indicated by the solid lines in FIG. 1) and a second state in which the first port (16a) and the second port (16b) communicate with each other and the third port (16c) and the fourth port (16d) communicate with each other (the state indicated by the broken lines in FIG. 1). The accumulator (17) stores liquid contained in a refrigerant sucked into the compressor (12).

[0030] The cylinder (71) is connected to the refrigerant circuit (11) via a connection pipe (72). The connection pipe (72) of this embodiment is connected to the suction pipe (19). The connection pipe (72) is provided with a control valve (73). The cylinder (71) is filled with a refrigerant before the heat source apparatus (1) is shipped out. After the heat source apparatus (1) has been transported to a site, an operator decompresses the refrigerant circuit (11). Then, when the operator opens the control valve (73), the refrigerant in the cylinder (71) is allowed to fill the refrigerant circuit (11).

[0031] The refrigerant circuit (11) performs a first refrigeration cycle and a second refrigeration cycle. In FIG. 1, the flow of a refrigerant in the first refrigeration cycle is indicated by the solid arrow, and the flow of a refrigerant in the second refrigeration cycle is indicated by the broken arrow. In the first refrigeration cycle, the four-way switching valve (16) is in the first state, where the water heat exchanger (15) functions as a radiator (a condenser) and the air heat exchanger (13) functions as an evaporator. In the second refrigeration cycle, the four-way switching valve (16) is in the second state, where the air heat exchanger (13) functions as a radiator (a condenser) and the water heat exchanger (15) functions as an evaporator.(1-2) Water Circuit

[0032] The water circuit (40) is connected to the water heat exchanger (15). The water circuit (40) includes a first water pipe (41) upstream of the water heat exchanger (15) and a second water pipe (42) downstream of the water heat exchanger (15). The water circuit (40) is connected with a pump (43). The pump (43) transports water in the water circuit (40). The water in the water circuit (40) is supplied to target components such as a boiler tank, an air-conditioning unit, and a floor heating unit. The water circuit (40) is connected with a gas-liquid separator (44). The gas-liquid separator (44) discharges to the atmosphere the refrigerant that has leaked from the refrigerant circuit (11) to the water circuit (40) via the water heat exchanger (15).(2) Outdoor Unit

[0033] The configuration of the outdoor unit (20) will be described in detail with reference to FIGS. 2 to 5. In the following description, the terms for the directions such as "top", "bottom", "right", "left", "front", and "back" refer to the directions of the arrows in FIG. 2. The outdoor unit (20) has the casing (21), components of the refrigerant circuit (11), and components of the water circuit (40). In addition to the elements described above, the components of the refrigerant circuit (11) include a refrigerant pipe, an electromagnetic valve, an internal heat exchanger, a filter, a thermal insulator for piping, and the like. The outdoor unit (20) has a partitioning member (45) that partitions the casing (21), and a fan (30) that transports the outdoor air.(2-1) Casing and Partitioning Member

[0034] The casing (21) is installed outdoors. The casing (21) is formed in a hollow box shape. More precisely, the casing (21) is formed in a box shape of which the left surface and the rear surface are opened partially. The casing (21) is formed in a rectangular parallelepiped shape of which the longitudinal direction is the first direction (the left-right direction) and the lateral direction is the second direction (the front-back direction). The casing (21) is comprised of metallic plate members. The casing (21) has a top plate (22), a bottom plate (23), a right plate (24), a left plate (25), a front plate (26), and a rear plate (27). The top plate (22) forms the upper surface of the casing (21), the bottom plate (23) forms the lower surface of the casing (21), the right plate (24) forms the right surface of the casing (21), the left plate (25) forms the left surface of the casing (21), the front plate (26) forms the front surface of the casing (21), and the rear plate (27) forms the rear surface of the casing (21). The left plate (25) is located in the front side of the casing (21) and is continuous with the front plate (26). The rear plate (27) is located in the right side of the casing (21) and is continuous with the right plate (24).

[0035] The partitioning member (45) is provided in the casing (21). The partitioning member (45) extends from the bottom plate (23) to the top plate (22). The partitioning member (45) extends in the front-back direction in top view. The partitioning member (45) in top view may be formed in a curved shape or a bent shape, or may be formed in a curve line. The partitioning member (45) partitions the inside of the casing (21) into a fan chamber (S1) as a first chamber and a machine chamber (S2) as a second chamber. The fan chamber (S1) is formed on the left side of the casing (21), and the machine chamber (S2) is formed on the right side of the casing (21).

[0036] The casing (21) has an inlet port (28) and an outlet port (29). The inlet port (28) is formed in part of the casing (21) that is from the rear surface to the left surface of the fan chamber (S1). The outlet port (29) is formed in part of the front plate (26) of the casing (21) that is in a front part of the fan chamber (S1). In the fan chamber (S1), a flow path in which the outdoor air flows is formed from the inlet port (28) to the outlet port (29). The casing (21) includes a side surface (21a), and in this embodiment, the cylinder (71) is located closer to the side surface (21a) than the compressor (12) is.(2-2) Configuration of Fan Chamber

[0037] The fan chamber (S1) is a substantially rectangular parallelepiped space. The length of the fan chamber (S1) in the first direction is greater than the length in the second direction. The fan chamber (S1) is provided with the air heat exchanger (13), the fan (30), and a bell mouth (31).

[0038] The air heat exchanger (13) is formed in an L-shape in top view. The air heat exchanger (13) has a first heat exchange portion (13a) along the rear surface of the fan chamber (S1) and a second heat exchange portion (13b) along the left surface of the fan chamber (S1). The air heat exchanger (13) is a fin-and-tube heat exchanger. A heat transfer tube of the air heat exchanger (13) is a multi-bored flat tube, but may be a straight tube.

[0039] The fan (30) is a propeller fan which has a motor (30a) and an impeller (30b). The motor (30a) is located behind the impeller (30b). The motor (30a) is supported by a support base (32) installed on the bottom plate (23). The motor (30a) drives and rotates the impeller (30b). The bell mouth (31) is in a tubular shape formed around the impeller (30b). The bell mouth (31) is continuous with the outlet port (29).

[0040] Part of the air heat exchanger (13) of this embodiment extends to the machine chamber (S2). The first heat exchange portion (13a) is located behind the partitioning member (45). The first heat exchange portion (13a) extends in the right direction to pass through a space behind a rear end portion of the partitioning member (45). A right end portion of the first heat exchange portion (13a) is located in the machine chamber (S2).(3) Configuration of Machine Chamber

[0041] The machine chamber (S2) is a substantially rectangular parallelepiped space. The length of the machine chamber (S2) in the first direction is substantially equal to the length in the second direction. The length of the machine chamber (S2) in the third direction (the top-bottom direction) is greater than the lengths in the first direction and the second direction. The length of the machine chamber (S2) in the first direction is smaller than the length of the fan chamber (S1) in the first direction. The compressor (12), the water heat exchanger (15), the gas-liquid separator (44), and the accumulator (17) are disposed in the machine chamber (S2). The outdoor unit (20) further includes a vibration reduction mechanism (50), a sound insulation member (60), and a filling unit (70). In this embodiment, the first direction, the second direction, and the third direction are perpendicular to one another; the first direction and the second direction are parallel to the horizontal direction; and the third direction is parallel to the vertical direction. In this embodiment, the first direction is the left-right direction; the second direction is the front-back direction; and the third direction is the top-bottom direction. In other words, the third direction is the direction in which the gravity acts (the gravity direction).(3-1) Compressor

[0042] The compressor (12) is disposed in the front side and in the left side of the machine chamber (S2). The compressor (12) has a compressor casing (12a) that is formed in a cylindrical shape. The compressor casing (12a) is formed in a vertically-long hollow cylindrical shape of which the height is greater than the outer diameter. The compressor casing (12a) forms a hermetically-closed pressure-resistant container. A top portion of the compressor casing (12a) is connected with the suction pipe (19). The compressor casing (12a) is connected with the discharge pipe (18). A thermal insulator (not shown) is wound around the compressor (12). The compressor (12) is, for example, a scroll compressor. In the compressor casing (12a), a compression mechanism (12d) is provided which includes an orbiting scroll and a fixed scroll and which compresses a refrigerant in a compression chamber formed between the orbiting scroll and the fixed scroll.(3-2) Water Heat Exchanger

[0043] The water heat exchanger (15) is disposed in the right side of the machine chamber (S2). The water heat exchanger (15) is closer to the right plate (24) than the compressor (12) is. The water heat exchanger (15) is closer to the rear plate (27) than the compressor (12) is. The water heat exchanger (15) is a plate heat exchanger. The water heat exchanger (15) is connected with the first water pipe (41), the second water pipe (42), and a refrigerant pipe (not shown).(3-3) Gas-Liquid Separator

[0044] The gas-liquid separator (44) is disposed above the water heat exchanger (15). The gas-liquid separator (44) is supported from below by the water heat exchanger (15). The gas-liquid separator (44) is provided with a release path that releases a gas refrigerant separated in the gas-liquid separator (44) and a gas vent valve that opens and closes the release path (not shown).(3-4) Accumulator

[0045] The accumulator (17) is connected to the suction pipe (19). The accumulator (17) is disposed in the rear side of the machine chamber (S2). The accumulator (17) is closer to the rear plate (27) than the compressor (12) and the water heat exchanger (15) are. The accumulator (17) is formed in a vertically-long hollow cylindrical shape of which the height is greater than the outer diameter. The outer diameter of the accumulator (17) is smaller than the outer diameter of the compressor (12). The rigidity of the accumulator (17) (the rigidity of the casing of the accumulator (17)) is greater than the rigidity of the compressor (12) (the rigidity of the compressor casing (12a)). In this embodiment, no thermal insulator is wound around the accumulator (17).(3-5) Vibration Reduction Mechanism

[0046] The vibration reduction mechanism (50) reduces vibration of the compressor (12) and the accumulator (17). The vibration reduction mechanism (50) of this embodiment has a support plate (51) that supports the compressor (12) from below and an elastic support portion (52) that is fixed on the bottom plate (23) and supports the support plate (51) from below.

[0047] The compressor (12) is fixed on the support plate (51). The support plate (51) is a plate member which has a substantially triangular shape in top view. A circular hole into which a bottom portion of the compressor (12) is fitted is formed in the center of the support plate (51).

[0048] The vibration reduction mechanism (50) of this embodiment has three elastic support portions (52). The elastic support portion (52) is disposed on or around each of the three top portions of the support plate (51). The elastic support portion (52) is disposed between the support plate (51) and the bottom plate (23). The elastic support portion (52) directly supports the support plate (51) from below. The elastic support portion (52) is made of rubber or urethane. The vibration of the compressor (12) is reduced by the elastic support portion (52) before being transmitted to the bottom plate (23).

[0049] In this embodiment, the cylinder (71) of the filling unit (70) is not supported by the support plate (51) and is fixed on the bottom plate (23).(3-6) Sound Insulation Member

[0050] The sound insulation member (60) reduces propagation of the noise generated when the compressor (12) is operating to the outside of the casing (21). The sound insulation member (60) is formed in a hollow box shape which is opened downward. The sound insulation member (60) has an upper wall (61), a right wall (62), a left wall (63), a front wall (64), and a rear wall (65). The upper wall (61) faces the top plate (22) and forms the upper surface of the sound insulation member (60). The right wall (62) faces the right plate (24) and forms the right surface of the sound insulation member (60). The left wall (63) faces the partitioning member (45) and forms the left surface of the sound insulation member (60). The front wall (64) faces the front plate (26) and forms the front surface of the sound insulation member (60). The rear wall (65) faces the rear plate (27) and forms the rear surface of the sound insulation member (60). The front wall (64) is attachable to and detachable from the body of the sound insulation member (60).

[0051] The sound insulation member (60) is supported by the bottom plate (23) of the casing (21). The sound insulation member (60) is a non-porous member. The sound insulation member (60) is comprised of, for example, metallic plate members or rubber sheets.

[0052] The sound insulation member (60) forms an internal space (66) in which the compressor (12) is housed. The components such as the compressor (12), the accumulator (17), the water heat exchanger (15), and the filling unit (70) are disposed in the internal space (66) of this embodiment.

[0053] The sound insulation member (60) and the casing (21) are spaced apart from each other with a predetermined gap. In other words, a clearance (67) is formed between the outer surface of the sound insulation member (60) and the inner surface of the casing (21). The clearance (67) reduces propagation of the noise generated when the compressor (12) is operating to the outside of the casing (21).(3-7) Filling Unit

[0054] The filling unit (70) is disposed in the right side of the machine chamber (S2) and in the front side of the machine chamber (S2). The filling unit (70) has the cylinder (71), the connection pipe (72), the control valve (73), and a protection member (74).

[0055] The cylinder (71) stores a flammable refrigerant for filling the refrigerant circuit (11). The cylinder (71) is filled with a refrigerant in advance when the heat source apparatus (1) is shipped out. Thus, when the heat source apparatus (1) is stored or transported, the cylinder (71) stores a refrigerant. After the heat source apparatus (1) has been installed on a site, the refrigerant circuit (11) is filled with a refrigerant from the cylinder (71) before the heat source apparatus (1) starts operation. Accordingly, when the heat source apparatus (1) is in use, the cylinder (71) is empty.

[0056] The cylinder (71) is formed in a vertically-long hollow cylindrical shape of which the height is greater than the outer diameter. The cylinder (71) forms a hermetically-closed pressure-resistant container. The rigidity of the cylinder (71) is smaller than the rigidity of the compressor casing (12a).

[0057] As shown in FIG. 1 and FIG. 3, a discharge port (711) is formed in a lower portion of the cylinder (71). More precisely, the discharge port (711) is formed in a bottom portion of the cylinder (71). A flammable refrigerant has a relatively high density. The discharge port (711) disposed in a lower portion of the cylinder (71) can induce a refrigerant to discharge. In addition, when loading a refrigerant into the refrigerant circuit (11), it is possible to reduce the remains of the refrigerant in the cylinder (71).

[0058] The connection pipe (72) is a pipe through which a refrigerant in the cylinder (71) is injected into the refrigerant circuit (11). One end of the connection pipe (72) is connected to the bottom portion of the cylinder (71) and communicates with the inside of the cylinder (71). The other end of the connection pipe (72) is connected to the suction pipe (19). The connection pipe (72) is located below the cylinder (71).

[0059] The control valve (73) is provided in the connection pipe (72). The control valve (73) controls the opening degree of the connection pipe (72). The control valve (73) is an exemplary on-off valve that opens and closes the connection pipe (72). The control valve (73) is located below the cylinder (71).

[0060] The protection member (74) has a function of protecting the connection pipe (72) and the control valve (73). The protection member (74) further has a function of supporting the cylinder (71) from below. The protection member (74) is installed between the cylinder (71) and the upper surface (23a) of the bottom plate (23). The upper surface (23a) of the bottom plate (23) means the upper surface (23a) of the bottom plate (23) in the vertical direction. The protection member (74) has a partition wall (74a) surrounding the connection pipe (72) and the control valve (73) and an adjustment member (74c). The partition wall (74a) has an opening (74b) through which the control valve (73) inside the partition wall (74a) is exposed to the outside of the partition wall (74a).

[0061] The adjustment member (74c) is, for example, a metallic member, and includes a leg portion (74c1) and a top plate portion (74c2). The leg portion (74c1) extends along the top-bottom direction. The lower ends of the leg portions (74c1) are fixed to the bottom plate (23). The top plate portion (74c2) is fixed to the upper end of the leg portion (74c1). The cylinder (71) is mounted on an upper surface of the top plate portion (74c2), and this upper surface functions as a mount surface of the cylinder (71). If the length of the leg portion (74c1) is changed, the height from the bottom plate (23) to the upper surface of the top plate portion (74c2) is changed. For example, the length of the leg portion (74c1) of the adjustment member (74c) may be changed by replacing an originally-installed leg portion (74c1) with a leg portion (74c1) which has a different length. In this case, only the leg portion (74c1) may be replaced, or the adjustment member (74c) including the leg portion (74c1) and the top panel portion (74c2) may be replaced. Further, for example, the leg portion (74c1) may include a first rod and a second rod slidably coupled in the top-bottom direction, and the length of the leg portion (74c1) may be changed by changing the sliding amount of the second rod relative to the first rod. Thus, the adjustment member (74c) functions as a height adjustment member that defines the height of the mount surface of the cylinder (71) from the bottom plate (23).(3-8) Access Port

[0062] As shown in FIGS. 3 and 4, an access port (A) is formed in the front side of the casing (21). The front plate (26) is provided with a front panel (26a) that is attachable to and detachable from a body of the front plate (26). When the front panel (26a) is detached, the access port (A) is exposed to the outside of the casing (21). When the front wall (64) is detached from the sound insulation member (60), the components in the casing (21) are exposed to the outside of the casing (21). The compressor (12) and the cylinder (71) overlap with the access port (A) in the second direction. The operator in front of the casing (21) can access the compressor (12) and the cylinder (71) through the access port (A). The operator can do maintenance on the compressor (12) and can operate the control valve (73) through the opening (74b).(4) Features of Positional Relation among Accumulator, Compressor, and Refrigerant Cylinder

[0063] As shown in FIG. 6, in top view (as viewed from above in the vertical direction), the angle (α) between the first virtual line (L1) and the second virtual line (L2) forms a predetermined angle (θ). The first virtual line (L1) is the virtual line that connects the center (12b) of the compressor (12) and the center (71b) of the cylinder (71). The second virtual line (L2) is the virtual line that connects the center (12b) of the compressor (12) and the center (17b) of the accumulator (17). In top view, the center (12b) of the compressor (12) is the center of the outer periphery of the casing of the compressor (12) (the compressor casing (12a)) that is formed in a substantially circular shape. In top view, the center (71b) of the cylinder (71) is the center of the outer periphery of the casing (71a) of the cylinder (71) that is formed in a substantially circular shape. In top view, the center (17b) of the accumulator (17) is the center of the outer periphery of the casing (17a) of the accumulator (17) that is formed in a substantially circular shape. The angle (α) between the first virtual line (L1) and the second virtual line (L2) is the smaller one of the two angles between the first virtual line (L1) and the second virtual line (L2).

[0064] As shown in FIG. 7, in top view, the predetermined angle (θ) is an angle at which the center (17b) of the accumulator (17) is located in a place separate from a region (M) located between the compressor (12) and the cylinder (71). In top view, the region (M) is a region defined by the compressor (12), the cylinder (71), and two common tangent lines (N1, N2) among the common tangent lines of the outer periphery of the compressor casing (12a) and the outer periphery of the casing (71a) of the cylinder (71) that do not intersect with the first virtual line (L1).

[0065] In general, a thermal insulator is not wound around the accumulator (17) unlike the compressor (12). Also, the accumulator (17) has a smaller diameter and a higher rigidity than the compressor (12). Thus, if the accumulator (17) collides with the cylinder (71), the cylinder (71) is likely to receive a greater impact.

[0066] In this embodiment, in top view, the angle (α) between the first virtual line (L1) and the second virtual line (L2) is configured to form the predetermined angle (θ), whereby the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are not aligned on a straight line. Thus, as shown in FIG. 8A and FIG. 8B, if the compressor (12) is detached from the bottom plate (23) (or the support plate (51)) and then the compressor (12) is displaced toward the cylinder (71), for example, due to the impact generated by the casing (21) being dropped and coming into contact with the ground (the casing (21) is dropped while the compressor (12) is located above the cylinder (71)), and if the accumulator (17) is not located in the region (M), the compressor (12) collides with the cylinder (71) without colliding with the cylinder (71), and thus it is possible to prevent the accumulator (17) from colliding with the cylinder (71). That is, as shown in FIG. 10, the compressor (12) collides indirectly with the cylinder (71) with the accumulator (17) sandwiched therebetween, whereby it is possible to prevent the accumulator (17) from colliding with the cylinder (71). Accordingly, for example, since the accumulator (17) has a higher rigidity than the compressor (12), the cylinder (71) receives a smaller impact when the compressor (12) directly collides with the cylinder (71) than when the accumulator (17) directly collides with the cylinder (71). Thus, it is possible to prevent the cylinder (71) from receiving a greater impact. The arrow Z in the figure indicates the direction in which the casing (21) is dropped when the casing (21) is dropped with the side surface (21a) ahead.

[0067] Also, as shown in FIG. 9A, if the center (17b) of the accumulator (17) is not located in the region (M) but part of the accumulator (17) is located in the region (M), the compressor (12) collides with the accumulator (17) when being displaced toward the cylinder (71) due to the impact caused by the casing (21) being dropped. Accordingly, the accumulator (17) as well as the compressor (12) is displaced, and as shown in FIG. 9B and FIG. 9C, the accumulator (17) collides with the cylinder (71). However, the accumulator (17) collides with the cylinder (71) not in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line (see FIG. 10), but, as shown in FIG. 9B or FIG. 9C, in a state in which the center (17b) of the accumulator (17) is displaced from the first virtual line (L1) that connects the center (12b) of the compressor (12) and the center (71b) of the cylinder (71). In the state shown in FIG. 9B, in a state in which the center (17b) of the accumulator (17) is displaced from the first virtual line (L1), the accumulator (17) collides with the cylinder (71), and also the compressor (12) collides with the cylinder (71). In the case shown in FIG. 9B, part of the impact (F) transmitted from the compressor (12) to the accumulator (17) (the force transmitted from the compressor (12)) acts in the direction perpendicular to the direction in which the force is transmitted from the accumulator (17) to the cylinder (71). Thus, the force acting from the accumulator (17) to the cylinder (71) is reduced. In the case shown in FIG. 9B, while the compressor (12) collides with the cylinder (71), the compressor (12) collides with the accumulator (17) so that the momentum of the compressor (12) is lowered. Thus, it is possible to prevent the cylinder (71) from receiving a greater impact. In the case shown in FIG. 9C, while the compressor (12) collides with the cylinder (71) with the accumulator (17) sandwiched therebetween, the impact (F) transmitted from the compressor (12) to the accumulator (17) is separated into the component (F1) transmitted to the cylinder (71) and the component (F2) trasnsmitted in the direction in which the component (F2) escapes from the cylinder (71). Thus, not all the impact (F) which the accumulator (17) have received from the compressor (12) when colliding with the compressor (12) is allowed to be transmitted from the accumulator (17) to the cylinder (71), and it is possible to separately distribute the component (F2) of the impact in the direction in which the component (F2) escapes from the cylinder (71) (the direction in which the component (F2) is separate from the first virtual line (L1)). Thus, it is possible to prevent the accumulator (17) from receiving a greater impact from the cylinder (71). As a result, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), it is possible to prevent the cylinder (71) from receiving a greater impact.

[0068] As shown in FIG. 7, in top view, the predetermined angle (θ) may be an angle at which the accumulator (17) (the entire part of the accumulator (17)) is located in a place separate from the region (M) located between the compressor (12) and the cylinder (71). Also, the predetermined angle (θ) may be 90 degrees or more. Thus, when the casing (21) is dropped with the compressor (12) located above the cylinder (71), the compressor (12) collides with the cylinder (71), and the accumulator (17) does not collide with the cylinder (71). Thus, it is possible to prevent the cylinder (71) from receiving a greater impact.

[0069] Also, in top view, the predetermined angle (θ) may be an angle at which the accumulator (17) (the entire part of the accumulator (17)) is not located on part (L11) of the first virtual line (L1) that is between the compressor (12) and the cylinder (71) (see FIG. 6). In other words, in top view, the predetermined angle (θ) may be an angle at which the accumulator (17) is located in a place separate from the first virtual line (L1). According to this configuration, even when the casing (21) is dropped with the compressor (12) located above the cylinder (71) so that the compressor (12) collides with the cylinder (71) with the accumulator (17) sandwiched therebetween, it is possible to prevent the compressor (12), the accumulator (17), and the cylinder (71) from successively colliding together in a state in which the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned on a straight line as shown in FIG. 10. Then, the components are distributed as shown in FIG. 9B or FIG. 9C, and thus it is possible to prevent the cylinder (71) from receiving a greater impact.

[0070] Also, as shown in FIG. 9A, the predetermined angle (θ) may be an angle at which the center (17b) of the accumulator (17) is located outside the region (M) and part of the accumulator (17) that does not include the center (17b) of the accumulator (17) is located inside the region (M). Thus, when falling down toward the cylinder (71), the compressor (12) touches the accumulator (17) before touching the cylinder (71), whereby it is possible to reduce the force by which the compressor (12) falls down.(5) Variations

[0071] The height of the accumulator (17) from the bottom plate (23) may be greater than the height of the cylinder (71) from the bottom plate (23). Thus, for example, even if the accumulator (17) falls toward the cylinder (71) due to the impact generated by the casing (21) being dropped and touching the ground, a body portion (17c) of the accumulator (17) collides with an upper portion (71c) of the cylinder (71). As a result, it is possible to prevent the accumulator (17) from colliding with a body portion (71d) of the cylinder (71) that is more fragile than both the upper end portion and the lower end portion, and thus it is possible to reduce damage to the cylinder (71). The body portion (71d) of the cylinder (71) is a vertically central part of the cylinder (71).

[0072] The heat source apparatus (1) may include a height adjustment member configured to define the height of the mount surface of the accumulator (17) from the bottom plate (23). The height adjustment member is disposed between the bottom plate (23) and the accumulator (17). For example, the height adjustment member is a metallic member, and includes a top plate portion that includes the mount surface of the accumulator (17) and a leg portion that is disposed between the top plate portion and the bottom plate (23). If the length of the leg portion is changed, the height from the bottom plate (23) to the mount surface of the top plate portion is changed. For example, the length of the leg portion of the height adjustment member may be changed by replacing an originally-installed leg portion with a leg portion which has a different length. In this case, only the leg portion may be replaced, or the height adjustment member itself may be replaced. Further, for example, the leg portion may include a first rod and a second rod slidably coupled in the top-bottom direction, and the length of the leg portion may be changed by changing the sliding amount of the second rod relative to the first rod. Thus, the height adjustment member can define the height of the mount surface of the accumulator (17) from the bottom plate (23). As a result, the accumulator (17) can be disposed so that the height of the accumulator (17) from the bottom plate (23) is greater than the height of the cylinder (71) from the bottom plate (23).

[0073] It will be understood that the embodiments and variations described above can be modified with various changes in form and details without departing from the spirit and scope of the claims. The elements according to embodiments, the variations thereof, and the other embodiments may be combined and replaced with each other. In addition, the expressions of "first," "second," "third," . . . , in the specification and claims are used to distinguish the terms to which these expressions are given, and do not limit the number and order of the terms.INDUSTRIAL APPLICABILITY

[0074] As described above, the present disclosure is useful for a heat source apparatus.DESCRIPTION OF REFERENCE CHARACTERS

[0075] 1Heat Source Apparatus 11Refrigerant Circuit 12Compressor 12bCenter of Compressor 17Accumulator 17bCenter of Accumulator 21Casing 23Bottom Plate 71Cylinder 71bCenter of Cylinder L1First Virtual Line L2Second Virtual Line θPredetermined Angle

Examples

Embodiment Construction

[0024]Embodiments of the present disclosure will be described in detail below with reference to the drawings. The present disclosure is not limited to the embodiments shown below, and various changes can be made within the scope without departing from the technical concept of the present disclosure. Since each of the drawings is intended to illustrate the present disclosure conceptually, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for ease of understanding.

(1) Basic Configuration of Heat Source Apparatus

[0025]A heat source apparatus (1) of this embodiment forms a refrigeration cycle apparatus that performs a refrigeration cycle. The refrigeration cycle apparatus is applied to a hot water supply apparatus. The heat source apparatus (1) heats water and supplies the heated water to target components. The heat source apparatus (1) has an outdoor unit (20) installed outdoors. The outdoor unit (20) has a casing (21). The casing (21) houses the entire part ...

Claims

1. A heat source apparatus comprising: a compressor (12) in a refrigerant circuit (11) that performs a refrigeration cycle; a cylinder (71) which is configured to store a flammable refrigerant for filling the refrigerant circuit (11) and which has a lower portion provided with a discharge port (711) through which the flammable refrigerant is discharged; an accumulator (17) connected to the compressor (12); and a casing (21) having a bottom plate (23) on which the compressor (12), the cylinder (71), and the accumulator (17) are installed, wherein in top view, an angle (α) between a first virtual line (L1) connecting a center (12b) of the compressor (12) and a center (71b) of the cylinder (71) and a second virtual line (L2) connecting the center (12b) of the compressor (12) and a center (17b) of the accumulator (17) forms a predetermined angle (θ).

2. The heat source apparatus of claim 1, wherein in the top view, the predetermined angle (θ) is an angle at which the accumulator (17) is not located on part (L11) of the first virtual line (L1) that is between the compressor (12) and the cylinder (71).

3. The heat source apparatus of claim 1, wherein in the top view, the predetermined angle (θ) is an angle at which the center (17b) of the accumulator (17) is located in a place separate from a region (M) located between the compressor (12) and the cylinder (71).

4. The heat source apparatus of claim 1, wherein in the top view, the predetermined angle (θ) is an angle at which the accumulator (17) is located in a place separate from a region (M) located between the compressor (12) and the cylinder (71).

5. The heat source apparatus of claim 1, wherein the predetermined angle (θ) is 90 degrees or more.

6. The heat source apparatus of claim 3, wherein in the top view, the predetermined angle (θ) is an angle at which part of the accumulator (17) that does not include the center (17b) of the accumulator (17) is located inside the region (M).

7. The heat source apparatus of any one of claims 1 to 6, wherein a height of the accumulator (17) from the bottom plate (23) is greater than a height of the cylinder (71) from the bottom plate (23).

8. The heat source apparatus of any one of claims 1 to 7, further comprising: a height adjustment member configured to define a height of a mount surface of the accumulator (17) from the bottom plate (23).

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