Heat source apparatus

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; a casing (21) having a bottom plate (23) on which the compressor (12) and the cylinder (71) are installed; and a height adjustment member (74c) configured to define a height of a mount surface of a bottom surface of the cylinder (71) from the bottom plate (23), wherein a distance between the compressor (12) and the cylinder (71) is represented by D; a height from the bottom plate (23) to a corner portion (12e) of an upper portion of the compressor (12) is represented by H1; and a height of the cylinder (71) from the bottom plate (23) is represented by H2, where the following relation is satisfied: H1 × sinθ ≥ H2, θ = tan-1 (H2 / D).

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 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 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 and the refrigerant cylinder are provided in the casing. Due to the impact generated by the casing being dropped and coming into contact with the ground, the compressor may tilt down toward the refrigerant cylinder. In this case, if the compressor collides with part of the body portion of the refrigerant cylinder that is more fragile than both the upper end portion and the lower end portion, the refrigerant cylinder may be damaged so that the refrigerant can leak into the air.

[0006] An object of the present disclosure is to prevent a compressor from colliding with a body portion of a cylinder when the compressor tilts down toward 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; a casing (21) having a bottom plate (23) on which the compressor (12) and the cylinder (71) are installed; and a height adjustment member (74c) configured to define a height of a mount surface of a bottom surface of the cylinder (71) from the bottom plate (23), wherein a distance between the compressor (12) and the cylinder (71) is represented by D; a height from the bottom plate (23) to a corner portion (12e) of an upper portion of the compressor (12) is represented by H1; and a height of the cylinder (71) from the bottom plate (23) is represented by H2, where the following relation is satisfied: H1 × sinθ ≥ H2, θ = tan -1< (H2 / D).

[0008] According to the first aspect, if the compressor (12) tilts down toward the cylinder (71), the compressor (12) collides with an upper portion (71b) of the cylinder (71), whereby it is possible to prevent the compressor (12) from colliding with the body portion (71a) of the cylinder (71).

[0009] A second aspect is an embodiment of the first aspect. In the second aspect, a rigidity of the adjustment member (74c) is lower than a rigidity of the cylinder (71).

[0010] According to the second aspect, even if the compressor (12) tilts down toward the cylinder (71) and collides with the cylinder (71), the impact generated by the compressor (12) colliding with the cylinder (71) can be absorbed by the adjustment member (74c) being deformed easily.

[0011] A third aspect is directed to a heat source apparatus. The heat source apparatus includes: a compressor (12) connected with 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

[0012] (711) through which the flammable refrigerant is discharged; a casing (21) having a bottom plate (23) on which the compressor (12) and the cylinder (71) are installed; and a height adjustment member (74c) configured to define a height of a mount surface of a bottom surface of the cylinder (71) from the bottom plate (23), wherein a distance between the compressor (12) and the cylinder (71) is greater than or equal to a height from the bottom plate (23) to an upper end of the compressor (12).

[0013] According to the third aspect, even if the compressor (12) tilts down toward the cylinder (71), the compressor (12) does not reach the cylinder (71), whereby it is possible to prevent the compressor (12) from colliding with the body portion (71a) of the cylinder (71).BRIEF DESCRIPTION OF THE DRAWINGS

[0014] [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 is a sectional view of part of a compressor. [FIG. 7] FIG. 7A and FIG. 7B are side views which show the positional relation between the compressor and a cylinder. [FIG. 8] FIG. 8 is a side view showing that the compressor tilts down toward the cylinder and collides with the cylinder. [FIG. 9] FIG. 9A is a side view showing the positional relation between a compressor and a cylinder in a variation. FIG. 9B is a side view showing that the compressor tilts down toward the cylinder in the variation. DESCRIPTION OF EMBODIMENTS

[0015] 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

[0016] 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.

[0017] 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.

[0018] 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

[0019] 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).

[0020] 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).

[0021] 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).

[0022] 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

[0023] 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

[0024] The configuration of the outdoor unit (20) will be described in detail with reference to FIGS. 2 to 6 and FIG. 7B. 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 internal heat exchanger, a filter, a thermal insulator for piping, and the like. The refrigerant circuit (11) includes an injection circuit that supplies a refrigerant to the suction side of the compressor (12), and an electromagnetic valve that opens and closes the injection circuit. The electromagnetic valve is disposed in a higher place than the cylinder (71). In this embodiment, a cover of the electromagnetic valve is hard and has corner portions. However, since the electromagnetic valve is disposed in a higher place than the cylinder (71), it is possible to reduce the cylinder (71) colliding with the cover of the electromagnetic valve, and it is possible to reduce damage to the cylinder (71). 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

[0025] 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).

[0026] 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).

[0027] 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 the cylinder (71) is located closer to the side surface (21a) than the compressor (12) is.(2-2) Configuration of Fan Chamber

[0028] 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).

[0029] 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.

[0030] 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).

[0031] 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

[0032] 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

[0033] 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). 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.

[0034] As shown in FIG. 6 and FIG. 7B, the compressor casing (12a) includes: a body portion casing (12a1); a first end portion casing (12a2) fixed (welded) on an upper end portion of the body portion casing (12a1); and a second end portion casing (12a3) fixed (welded) on a lower end portion of the body portion casing (12a1). The body portion casing (12a1) is a cylindrical member of which both the upper end portion and the lower end portion are open. The first end portion casing (12a2) is a bowl-shaped member of which the lower end is provided with an opening (12a21). The first end portion casing (12a2) covers an opening (12a11) of the upper end of the body portion casing (12al). The opening (12al1) of the upper end of the body portion casing (12a1) is inserted into the opening (12a21) of the lower end of the first end portion casing (12a2). The second end portion casing (12a3) is a bowl-shaped member of which the upper end is provided with an opening. The second end portion casing covers an opening of the lower end of the body portion casing (12a1). The opening (21b) of the lower end of the body portion casing (12a1) is inserted into the opening of the upper end of the second end portion casing (12a3).(3-2) Water Heat Exchanger

[0035] As shown in FIG. 2 to FIG. 5, the compressor (12) 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

[0036] 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

[0037] 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.(3-5) Vibration Reduction Mechanism

[0038] 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.

[0039] 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).

[0040] 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).

[0041] In this embodiment, the cylinder (71) of the filling unit (70) is not supported by the support plate (51) and is disposed above the bottom plate (23).(3-6) Sound Insulation Member

[0042] 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).

[0043] 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.

[0044] 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.

[0045] 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

[0046] 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 (74c3).

[0047] 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.

[0048] 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).

[0049] As shown in FIG. 1, 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).

[0050] 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).

[0051] 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).

[0052] An adjustment member (74c) is a component that resides between the bottom plate (23) of the casing (21) and the bottom surface of the cylinder (71) and that supports the cylinder (71). The adjustment member (74c) is, for example, a metallic member, and includes a leg portion (74c1), a top plate portion (74c2), and the protection member (74c3). The leg portion (74c1) extends along the top-bottom direction. The lower end of the leg portion (74c1) is fixed to the bottom plate (23). The top plate portion (74c2) is fixed to the upper end of the leg portion (74c1). The protection member (74c3) is fixed to an upper portion of the top plate portion (74c2). The cylinder (71) is installed on the upper portion of the top plate portion (74c2) via the protection member (74c3). The protection member (74c3) has a function of supporting the cylinder (71) from below. The protection member (74c3) 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. As shown in FIG. 5, in this embodiment, a bracket (80) is fixed to an upper portion of the protection member (74c3) by a screw (81) or the like, and a lower portion of the cylinder (71) is fixed to the bracket (80) by welding or the like. The cylinder (71) is supported by the protection member (74c3) via the bracket (80). The surface of the bracket (80) on which the cylinder (71) is fixed (welded) functions as a surface on which the bottom surface of the cylinder (71) is mounted. If the length of the leg portion (74c1) is changed, the height from the bottom plate (23) to the upper portion 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) itself 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. The length of the protection member (74c3) in the top-bottom direction (the vertical direction) may be changed to adjust the height of the mount surface of the cylinder (71) from the bottom plate (23), or the length of the top plate portion (74c2) in the top-bottom direction may be changed to adjust the height of the mount surface of the cylinder (71) from the bottom plate (23). Thus, the adjustment member (74c) functions as a height adjustment member that defines the height of the mount surface of the bottom surface of the cylinder (71) from the bottom plate (23).

[0053] The protection member (74c3) further has a function of protecting the connection pipe (72) and the control valve (73). The protection member (74c3) includes a separation wall (74c31) that surrounds the connection pipe (72) and the control valve (73). The separation wall (74c31) has an opening (74c32) through which the control valve (73) located inside the separation wall (74c31) is exposed to the outside of the separation wall (74c31).(3-8) Access Port

[0054] 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 (74c32).

[0055] (4) Features of Positional Relation between Compressor and Refrigerant Cylinder As shown in FIG. 3 and FIG. 5, the compressor (12) and the cylinder (71) are installed (fixed) directly or indirectly on the bottom plate (23). In this embodiment, the compressor (12) is installed (fixed) indirectly on the bottom plate (23) via the support plate (51) and the elastic supporting portion (52). In this embodiment, the cylinder (71) is installed (fixed) indirectly on the bottom plate (23) via the protection member (74c3). In this embodiment, the compressor (12) and the cylinder (71) are installed directly or indirectly on the upper surface (23a) of the bottom plate (23), and the upper surface (23a) of the bottom plate (23) is a horizontal surface. The bottom plate (23) is the bottom plate (23) of the casing (21) that houses the compressor (12) and the cylinder (71).

[0056] As shown in FIG. 7A and FIG. 7B, the distance between the compressor (12) and the cylinder (71) is represented by D; the height from the bottom plate (23) to a corner portion (12e) of the upper portion of the compressor (12) is represented by H1; and the height of the cylinder (71) from the bottom plate (23) is represented by H2, where the relation given by Expression 1 below is satisfied. The distance between the compressor (12) and the cylinder (71) is the shortest distance between the compressor (12) and the cylinder (71) in plan view (as viewed in the third direction). The corner portion (12e) of the upper portion of the compressor (12) is a welded portion of the compressor casing (12a) at which the first end portion casing (12a2) and the body portion casing (12a1) are welded, and is located in, for example, a lower end portion of the first end portion casing (12a2). Because being a welded portion, the corner portion (12e) of the upper portion of the compressor (12) tends to have high rigidity, and thus, when the corner portion (12e) of the upper portion of the compressor (12) collides with the body portion (71a) of the cylinder (71), the cylinder (71) is easily damaged. H 1 × sinθ ≥ H 2 θ = tan − 1 H 2 / D (5) Advantages

[0057] When Expression 1 is satisfied, as shown in FIG. 8, the compressor (12) collides with an upper portion (71b) of the cylinder (71) if the compressor (12) is detached from the bottom plate (23) (or the support plate (51)) and the compressor (12) then tilts down 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)). Specifically, if the compressor (12) tilts down toward the cylinder (71), the vertically middle portion (the body portion casing (12a1)) of the compressor (12) or the upper portion (the first end portion casing (12a2)) of the compressor (12) collides with the upper portion (71b) of the cylinder (71). The compressor (12) does not collide with the body portion (71a) of the cylinder (71). Accordingly, even if the compressor (12) tilts down toward the cylinder (71), it is possible to prevent the compressor (12) from colliding with the body portion (71a) which is more fragile than both the upper end portion and the lower end portion of the cylinder (71), and thus it is possible to reduce damage to the cylinder (71). Further, it is possible to prevent the corner portion (12e) of the upper portion of the compressor (12) which tends to have high rigidity from colliding with the body portion (71a) of the cylinder (71), and thus it is possible to reduce damage to the cylinder (71). The body portion (71a) of the cylinder (71) is a vertically central portion of the cylinder (71).(6) Variations

[0058] The above embodiment may be modified into the following variations. In the following description, the differences from the above embodiment will be described.(6-1) First Variation

[0059] The rigidity of the protection member (74c3) (the adjustment member (74c)) may be lower than the rigidity of the cylinder (71). Accordingly, even if the compressor (12) tilts down toward the cylinder (71) and collides with the cylinder (71), the impact generated by the compressor (12) colliding with the cylinder (71) can be absorbed by the protection member (74c3) (the adjustment member (74c)) being deformed easily.(6-2) Second Variation

[0060] As shown in FIG. 9A, the distance D between the compressor (12) and the cylinder (71) may be greater than or equal to the height H3 from the bottom plate (23) to the upper end of the compressor (12). Accordingly, as shown in FIG. 9B, even if the compressor (12) tilts down toward the cylinder (71), the compressor (12) does not reach the cylinder (71). Accordingly, even if the compressor (12) tilts down toward the cylinder (71), the compressor (12) does not collide with the cylinder (71). As a result, even if the compressor (12) tilts down toward the cylinder (71), it is possible to prevent the compressor (12) from colliding with the body portion (71a) of the cylinder (71), and thus it is possible to reduce damage to the cylinder (71).

[0061] 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

[0062] As described above, the present disclosure is useful for a heat source apparatus.DESCRIPTION OF REFERENCE CHARACTERS

[0063] 1Heat Source Apparatus 11Refrigerant Circuit 12Compressor 12eCorner Portion 21Casing 71Cylinder 74cHeight Adjustment Member (Adjustment Member) 711Discharge Port

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; a casing (21) having a bottom plate (23) on which the compressor (12) and the cylinder (71) are installed; and a height adjustment member (74c) configured to define a height of a mount surface of a bottom surface of the cylinder (71) from the bottom plate (23), wherein a distance between the compressor (12) and the cylinder (71) is represented by D; a height from the bottom plate (23) to a corner portion (12e) of an upper portion of the compressor (12) is represented by H1; and a height of the cylinder (71) from the bottom plate (23) is represented by H2, where a relation given by Expression 1 below is satisfied: H 1 × sinθ ≥ H 2 θ = tan − 1 H 2 / D 2. The heat source apparatus of claim 1, wherein a rigidity of the adjustment member (74c) is lower than a rigidity of the cylinder (71).

3. A heat source apparatus comprising: a compressor (12) connected with 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; a casing (21) having a bottom plate (23) on which the compressor (12) and the cylinder (71) are installed; and a height adjustment member (74c) configured to define a height of a mount surface of a bottom surface of the cylinder (71) from the bottom plate (23), wherein a distance between the compressor (12) and the cylinder (71) is greater than or equal to a height from the bottom plate (23) to an upper end of the compressor (12).

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