Heat source apparatus

Abstract

This heat source apparatus is provided with: a compressor (12) included in a refrigerant circuit (11) that carries out a refrigeration cycle; a gas cylinder (71) that stores a flammable refrigerant to be loaded in the refrigerant circuit (11) and that has, at a lower part thereof, a discharge port (711) for discharging the flammable refrigerant; a casing (21) that has a bottom plate (23) on which the compressor (12) and the gas cylinder (71) are installed; and a height adjustment member (74c) for regulating the height of the installation plane in the bottom surface of the gas cylinder (71) from the bottom plate (23). When D represents the distance between the compressor (12) and the gas cylinder (71), H1 represents the height of a corner (12e) at the top of the compressor (12) from the bottom plate (23), and H2 represents the height of the gas cylinder (71) from the bottom plate (23), the relations H1×sinθ≥H2 and θ=tan-1(H2 / D) is satisfied.

Description

heat source device

[0001] The present disclosure relates to a heat source device.

[0002] Patent Document 1 discloses a heat source device including a compressor connected to a refrigerant circuit. The compressor is installed on a bottom plate within a casing of the heat source device.

[0003] JP 2013-155921 A

[0004] The present inventors have devised a configuration in which a refrigerant cylinder is provided inside the casing of a heat source device. The refrigerant cylinder stores refrigerant to be filled into the refrigerant circuit. This allows the refrigerant circuit to be filled with refrigerant from the refrigerant cylinder when the heat source device is installed, eliminating the need to separately prepare refrigerant for filling. However, the configuration in which a refrigerant cylinder is provided inside the casing presents the following unique problems.

[0005] During transportation of the heat source device until installation at the site, there is a risk that the casing may fall. The casing contains a compressor and a refrigerant cylinder. When the casing falls and hits the ground, the impact can cause the compressor to tip toward the refrigerant cylinder. In this case, if the compressor collides with the body of the refrigerant cylinder, which is weaker than the upper and lower ends, the refrigerant cylinder could be damaged, potentially causing the refrigerant to leak into the air.

[0006] An object of the present disclosure is to prevent the compressor from colliding with the body of the cylinder when the compressor falls toward the cylinder.

[0007] The first aspect is directed to a heat source device, the heat source device including: a compressor (12) included in a refrigerant circuit (11) that performs a refrigeration cycle; a cylinder (71) that stores a flammable refrigerant to be filled into the refrigerant circuit (11) and has, at a lower part thereof, an outlet (711) for discharging the flammable refrigerant; a casing (21) having a bottom plate (23) on which the compressor (12) and the cylinder (71) are placed; and a height adjusting member (74c) that determines the height of the installation surface of the bottom of the cylinder (71) from the bottom plate (23), where D is the distance between the compressor (12) and the cylinder (71), H1 is the height from the bottom plate (23) to an upper corner (12e) of the compressor (12), and H2 is the height of the cylinder (71) from the bottom plate (23), where H1×sin θ≧H2, and θ=tan －１ The relationship (H2 / D) holds.

[0008] In the first aspect, when the compressor (12) falls toward the cylinder (71), the compressor (12) collides with the upper part (71b) of the cylinder (71), thereby preventing the compressor (12) from colliding with the body part (71a) of the cylinder (71).

[0009] In the second aspect, in the first aspect, the rigidity of the adjusting member (74c) is lower than the rigidity of the cylinder (71).

[0010] In the second aspect, even if the compressor (12) falls toward the cylinder (71) and collides with the cylinder (71), the adjustment member (74c) is easily deformed, and is therefore able to absorb the impact caused by the collision between the compressor (12) and the cylinder (71).

[0011] The third aspect relates to a heat source device, which includes: a compressor (12) connected to a refrigerant circuit (11) that performs a refrigeration cycle; a cylinder (71) that stores a flammable refrigerant to be filled into the refrigerant circuit (11) and has, at its bottom, an outlet (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 placed; and a height adjustment member (74c) that determines the height of the installation surface of the bottom of the cylinder (71) from the bottom plate (23), wherein the distance between the compressor (12) and the cylinder (71) is equal to or greater than the height from the bottom plate (23) to the upper end of the compressor (12).

[0012] In the third aspect, even if the compressor (12) falls toward the cylinder (71), the compressor (12) does not reach the cylinder (71), thereby preventing the compressor (12) from colliding with the body portion (71a) of the cylinder (71).

[0013] FIG. 1 is a schematic piping diagram of a refrigerant circuit of a heat source device according to an embodiment. FIG. 2 is a schematic perspective view of an outdoor unit. FIG. 3 is a front view of the outdoor unit, showing a state in which the front access opening of the machine room is open. FIG. 4 is a plan view schematically showing the interior of the outdoor unit. FIG. 5 is a side view of the interior of the outdoor unit, seen from the right side with the side panel removed. FIG. 6 is a cross-sectional view of a portion of a compressor. FIGS. 7(a) and 7(b) are side views showing the positional relationship between the compressor and a cylinder. FIG. 8 is a side view showing a state in which the compressor has fallen toward the cylinder and collided with it. FIG. 9(a) is a side view showing the positional relationship between the compressor and a cylinder in a modified example. FIG. 9(b) is a side view showing a state in which the compressor has fallen toward the cylinder in a modified example.

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical concept of the present disclosure. Since the drawings are intended to conceptually explain the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary to facilitate understanding.

[0015] (1) Basic Configuration of the Heat Source Device The heat source device (1) of this embodiment constitutes a refrigeration cycle device that performs a refrigeration cycle. The refrigeration cycle device is applied to a hot water supply system. The heat source device (1) heats water and supplies the heated water to an object. The heat source device (1) has an outdoor unit (20) installed outdoors. The outdoor unit (20) has a casing (21). The casing (21) accommodates the entire refrigerant circuit (11), which is a closed circuit. The refrigerant circuit (11) is filled with refrigerant. The refrigerant circuit (11) performs a refrigeration cycle.

[0016] The refrigerant in the refrigerant circuit (11) is a flammable refrigerant. Specifically, the refrigerant in this embodiment is propane (R290), a highly flammable natural refrigerant. Natural refrigerants have an ozone depletion potential of zero, a low global warming potential, and a low environmental impact. Propane ignites at temperatures of 500°C or lower.

[0017] The flammable refrigerant may be methane (R50), ethane (R170), butane (R600), isobutane (R600a). The natural refrigerant may be a corrosive refrigerant, for example ammonia (R717).

[0018] (1-1) Refrigerant Circuit As shown in Fig. 1, the refrigerant circuit (11) includes, as its main components, a compressor (12), an air heat exchanger (13), an expansion valve (14), a water heat exchanger (15), and a cylinder (71). The refrigerant circuit (11) further includes a four-way switching valve (16) and an accumulator (17).

[0019] The compressor (12) compresses the refrigerant. A discharge pipe (18) is connected to the discharge side of the compressor (12), and a suction pipe (19) is connected to the suction side of the compressor (12). The air heat exchanger (13) exchanges heat between the refrigerant and outdoor air. The expansion valve (14) reduces the pressure of the refrigerant. The water heat exchanger (15) exchanges heat between the refrigerant in the refrigerant circuit (11) and water in the water circuit (40). The four-way selector valve (16) switches the circulation direction of the refrigerant. The four-way selector valve (16) is switched between a first state (shown by a solid line in FIG. 1) in which the first port (16a) and the third port (16c) communicate with each other and simultaneously the second port (16b) and the fourth port (16d) communicate with each other, and a second state (shown by a dashed line in FIG. 1) in which the first port (16a) and the second port (16b) communicate with each other and simultaneously the third port (16c) and the fourth port (16d) communicate with each other. The accumulator (17) accumulates liquid in the refrigerant sucked into the compressor (12).

[0020] The cylinder (71) is connected to the refrigerant circuit (11) via a connecting pipe (72). In this embodiment, the connecting pipe (72) is connected to the suction pipe (19). A control valve (73) is provided on the connecting pipe (72). The cylinder (71) is filled with refrigerant before shipping the heat source device (1). After transporting the heat source device (1) to the site, an operator depressurizes the refrigerant circuit (11). Thereafter, when the operator opens the control valve (73), the refrigerant from the cylinder (71) is filled into the refrigerant circuit (11).

[0021] The refrigerant circuit (11) performs a first refrigeration cycle and a second refrigeration cycle. In Fig. 1, the flow of refrigerant in the first refrigeration cycle is indicated by solid arrows, and the flow of refrigerant in the second refrigeration cycle is indicated by dashed arrows. In the first refrigeration cycle, the four-way selector valve (16) is in the first position, and the water heat exchanger (15) functions as a radiator (condenser) while the air heat exchanger (13) functions as an evaporator. In the second refrigeration cycle, the four-way selector valve (16) is in the second position, and the air heat exchanger (13) functions as a radiator (condenser) while the water heat exchanger (15) functions as an evaporator.

[0022] (1-2) Water Circuit 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). A pump (43) is connected to the water circuit (40). The pump (43) transports water in the water circuit (40). The water in the water circuit (40) is supplied to a hot water tank, an air conditioning unit, a floor heating unit, or other such devices. A gas-liquid separator (44) is connected to the water circuit (40). The gas-liquid separator (44) releases refrigerant leaked from the refrigerant circuit (11) through the water heat exchanger (15) into the atmosphere.

[0023] (2) Outdoor Unit The configuration of the outdoor unit (20) will be described in detail with reference to Figures 2 to 6 and Figure 7(b). In the following description, terms such as "upper," "lower," "right," "left," "front," and "rear" refer to the directions indicated by the arrows in Figure 2. The outdoor unit (20) has a casing (21), components of a refrigerant circuit (11), and components of a water circuit (40). The components of the refrigerant circuit (11) include, in addition to the above-mentioned elements, refrigerant piping, an internal heat exchanger, a filter, piping insulation, and the like. The refrigerant circuit (11) includes an injection circuit that supplies refrigerant to the suction side of the compressor (12) and a solenoid valve that opens and closes the injection circuit. The solenoid valve is located higher than the cylinder (71). In this embodiment, the cover of the solenoid valve is hard and has corners, but the solenoid valve is disposed at a position higher than the cylinder (71), thereby preventing the cylinder (71) from colliding with the cover of the solenoid valve and preventing damage to the cylinder (71). The outdoor unit (20) has a partition member (45) that separates the casing (21) and a fan (30) that transports outdoor air.

[0024] (2-1) Casing and Partition Member The casing (21) is installed outdoors. The casing (21) is formed in a hollow box shape. Strictly speaking, the casing (21) is formed in a box shape with a portion of the left and rear faces open. The casing (21) is formed in a rectangular parallelepiped shape with the first direction (left-right direction) as the longitudinal direction and the second direction (front-rear direction) as the lateral direction. The casing (21) is made of a metal plate material. 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 toward the front of the casing (21) and is continuous with the front plate (26). The rear plate (27) is located toward the right of the casing (21) and is continuous with the right plate (24).

[0025] A partition member (45) is provided inside the casing (21). The partition member (45) extends from the bottom plate (23) to the top plate (22). The partition member (45) extends in the front-to-rear direction in a top view. The partition member (45) may have a curved or bent shape in a top view, or may be formed into a curved shape. The partition member (45) divides the interior of the casing (21) into a fan chamber (S1) that is a first chamber and a machine chamber (S2) that is 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).

[0026] The casing (21) is formed with an inlet (28) and an outlet (29). The inlet (28) is formed in the casing (21) from the rear surface of the fan chamber (S1) to the left surface. The outlet (29) is formed in a portion of the front plate (26) of the casing (21) in front of the fan chamber (S1). In the fan chamber (S1), a flow path for outdoor air is formed from the inlet (28) to the outlet (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).

[0027] (2-2) Configuration of the Fan Chamber The fan chamber (S1) is formed as a substantially rectangular parallelepiped space. The length of the fan chamber (S1) in the first direction is greater than the length of the fan chamber (S1) in the second direction. The fan chamber (S1) is provided with an air heat exchanger (13), a fan (30), and a bell mouth (31).

[0028] The air heat exchanger (13) is formed in an L-shape when viewed from above. The air heat exchanger (13) has a first heat exchange section (13a) along the rear surface of the fan chamber (S1) and a second heat exchange section (13b) along the left surface of the fan chamber (S1). The air heat exchanger (13) is a fin-and-tube heat exchanger. The heat transfer tubes of the air heat exchanger (13) are formed of flat multi-hole tubes, but may also be straight tubes.

[0029] The fan (30) is a propeller fan having a motor (30a) and an impeller (30b). The motor (30a) is located rearward of the impeller (30b). The motor (30a) is supported by a support base (32) attached to the bottom plate (23). The motor (30a) drives and rotates the impeller (30b). The bell mouth (31) is cylindrical and formed around the impeller (30b). The bell mouth (31) is continuous with the air outlet (29).

[0030] A portion of the air heat exchanger (13) of this embodiment extends to the machine room (S2). The first heat exchange section (13a) is located rearward of the partition member (45). The first heat exchange section (13a) extends rightward so as to pass through a space behind the rear end of the partition member (45). The right end of the first heat exchange section (13a) is located in the machine room (S2).

[0031] (3) Configuration of the Machine Room The machine room (S2) is formed as a substantially rectangular parallelepiped space. The length of the machine room (S2) in the first direction is approximately equal to the length of the machine room (S2) in the second direction. The length of the machine room (S2) in the third direction (vertical direction) is greater than the lengths of the machine room (S2) in the first and second directions. The length of the machine room (S2) in the first direction is smaller than the length of the fan room (S1) in the first direction. The machine room (S2) contains a compressor (12), a water heat exchanger (15), a gas-liquid separator (44), and an accumulator (17). The outdoor unit (20) further includes a vibration isolation mechanism (50), a sound insulation member (60), and a filling unit (70). In this embodiment, the first, second, and third directions are perpendicular to each other, the first and second directions 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-rear direction, and the third direction is the up-down direction. In other words, the third direction is the direction in which gravity acts (gravity direction).

[0032] (3-1) Compressor The compressor (12) is disposed near the front and left side of the machine room (S2). The compressor (12) has a cylindrical compressor casing (12a). The compressor casing (12a) is formed in a vertically elongated hollow cylindrical shape whose height is greater than its outer diameter. The compressor casing (12a) constitutes a sealed pressure-resistant container. A suction pipe (19) is connected to the top of the compressor casing (12a). A discharge pipe (18) is connected to the compressor casing (12a). The compressor (12) is, for example, a scroll compressor. A compression mechanism (12d) including a movable scroll, a fixed scroll, etc., is disposed inside the compressor casing (12a) and compresses a refrigerant in a compression chamber formed between the movable scroll and the fixed scroll.

[0033] As shown in FIGS. 6 and 7(b), the compressor casing (12a) includes a body casing (12a1), a first end casing (12a2) fixed (welded) to the upper end of the body casing (12a1), and a second end casing (12a3) fixed (welded) to the lower end of the body casing (12a1). The body casing (12a1) is a cylindrical member having openings at both the top and bottom ends. The first end casing (12a2) is a bowl-shaped member having an opening (12a21) at its lower end. The first end casing (12a2) covers the opening (12a11) at the upper end of the body casing (12a1). The opening (12a21) at the lower end of the first end casing (12a2) is inserted into the opening (12a11) at the upper end of the body casing (12a1). The second end casing (12a3) is a bowl-shaped member having an opening at its upper end. The second end casing (12a3) covers the opening at the lower end of the body casing (12a1). The opening at the upper end of the second end casing (12a3) is inserted into the opening at the lower end (21b) of the body casing (12a1).

[0034] (3-2) Water Heat Exchanger As shown in FIGS. 2 to 5, the water heat exchanger (15) is disposed on the right side of the machine room (S2). The water heat exchanger (15) is closer to the right plate (24) than the compressor (12). The water heat exchanger (15) is closer to the rear plate (27) than the compressor (12). The water heat exchanger (15) is a plate-type heat exchanger. A first water pipe (41), a second water pipe (42), and a refrigerant pipe (not shown) are connected to the water heat exchanger (15).

[0035] (3-3) Gas-Liquid Separator 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 discharge path for discharging the gas refrigerant separated therein and a gas vent valve for opening and closing the discharge path (not shown).

[0036] (3-4) Accumulator The accumulator (17) is connected to the suction pipe (19). The accumulator (17) is disposed toward the rear of the machine room (S2). The accumulator (17) is closer to the rear plate (27) than the compressor (12) and the water heat exchanger (15). The accumulator (17) is formed in the shape of a vertically elongated hollow cylinder whose height is greater than its outer diameter.

[0037] (3-5) Vibration Isolation Mechanism The vibration isolation mechanism (50) suppresses vibration of the compressor (12) and the accumulator (17). The vibration isolation mechanism (50) of this embodiment includes a support plate (51) that supports the compressor (12) from below, and an elastic support part (52) that is fixed on the bottom plate (23) and supports the support plate (51) from below.

[0038] The compressor (12) is fixed on a support plate (51). The support plate (51) is a plate member having a substantially triangular shape when viewed from above. A circular hole is formed in the center of the support plate (51) into which the bottom of the compressor (12) fits.

[0039] The vibration-proof mechanism (50) of this embodiment has three elastic support members (52). Each elastic support member (52) is disposed near one of the three tops of the support plate (51). The elastic support members (52) are disposed between the support plate (51) and the bottom plate (23). The elastic support members (52) directly support the support plate (51) from below. The elastic support members (52) are made of rubber or urethane. Vibrations of the compressor (12) are attenuated by the elastic support members (52) before being transmitted to the bottom plate (23).

[0040] In this embodiment, the cylinder (71) of the filling unit (70) is not supported by the support plate (51) but is disposed above the bottom plate (23).

[0041] (3-6) Sound Insulation Member The sound insulation member (60) prevents noise generated during operation of the compressor (12) from propagating to the outside of the casing (21). The sound insulation member (60) is formed in the shape of a hollow box that is open at the bottom. 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 constitutes the upper surface of the sound insulation member (60). The right wall (62) faces the right plate (24) and constitutes the right surface of the sound insulation member (60). The left wall (63) faces the partition member (45) and constitutes the left surface of the sound insulation member (60). The front wall (64) faces the front plate (26) and constitutes the front surface of the sound insulation member (60). The rear wall (65) faces the rear plate (27) and constitutes the rear surface of the sound insulating member (60). The front wall (64) is detachable from the main body of the sound insulating member (60).

[0042] The sound insulating member (60) is supported on the bottom plate (23) of the casing (21). The sound insulating member (60) is made of an air-impermeable material, such as a metal plate or a rubber sheet.

[0043] The sound insulating member (60) defines an internal space (66) for accommodating the compressor (12). In the internal space (66) of this embodiment, devices such as the compressor (12), the accumulator (17), the water heat exchanger (15), and the filling unit (70) are arranged.

[0044] The sound insulating member (60) and the casing (21) are disposed with a predetermined gap therebetween. In other words, a gap (67) is formed between the outer surface of the sound insulating member (60) and the inner surface of the casing (21). This gap (67) prevents noise generated during operation of the compressor (12) from being transmitted to the outside of the casing (21).

[0045] (3-7) Charging Unit The charging unit (70) is disposed to the right of the machine room (S2) and toward the front of the machine room (S2). The charging unit (70) includes a cylinder (71), a connecting pipe (72), a control valve (73), and a protective member (74c3).

[0046] The cylinder (71) stores a flammable refrigerant to be filled into the refrigerant circuit (11). The cylinder (71) is filled with the refrigerant before shipping the heat source device (1). Therefore, the cylinder (71) contains the refrigerant during storage or transportation of the heat source device (1). After the heat source device (1) is installed on-site, the refrigerant is filled into the refrigerant circuit (11) from the cylinder (71) before operation of the heat source device (1). Therefore, the cylinder (71) is empty when the heat source device (1) is in use.

[0047] The cylinder (71) is formed in the shape of a vertically long hollow cylinder whose height is greater than its outer diameter. The cylinder (71) constitutes a sealed pressure-resistant container. The rigidity of the cylinder (71) is lower than the rigidity of the compressor casing (12a).

[0048] As shown in FIG. 3 , an outlet (711) is formed at the lower part of the cylinder (71). Strictly speaking, the outlet (711) is formed at the bottom of the cylinder (71). Flammable refrigerants have a relatively high density. By locating the outlet (711) at the lower part of the cylinder (71), it is possible to promote the discharge of the refrigerant. In addition, it is possible to prevent the refrigerant from remaining in the cylinder (71) when the refrigerant circuit (11) is filled with the refrigerant.

[0049] The connecting pipe (72) is a pipe for injecting the refrigerant from the cylinder (71) into the refrigerant circuit (11). One end of the connecting pipe (72) is connected to the bottom of the cylinder (71) and communicates with the interior of the cylinder (71). The other end of the connecting pipe (72) is connected to the suction pipe (19). The connecting pipe (72) is located below the cylinder (71).

[0050] The control valve (73) is provided on the connecting pipe (72). The control valve (73) adjusts the opening degree of the connecting pipe (72). The control valve (73) is an example of an on-off valve that opens and closes the connecting pipe (72). The control valve (73) is located below the cylinder (71).

[0051] The adjustment member (74c) is a component that is located between the bottom plate (23) of the casing (21) and the bottom surface of the cylinder (71) and supports the cylinder (71). The adjustment member (74c) is, for example, a metal member and includes legs (74c1), a top plate (74c2), and a protective member (74c3). The legs (74c1) extend in the vertical direction. The lower ends of the legs (74c1) are fixed to the bottom plate (23). The top plate (74c2) is fixed to the upper ends of the legs (74c1). The protective member (74c3) is fixed to the upper part of the top plate (74c2). The cylinder (71) is placed on the upper part of the top plate (74c2) via the protective member (74c3). The protective member (74c3) functions to support the cylinder (71) from below. The protective 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) refers to 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 the upper part of the protective member (74c3) with screws (81) or the like, and the lower part of the cylinder (71) is fixed to the bracket (80) by welding or the like. The cylinder (71) is supported by the protective member (74c3) via the bracket (80). The surface of the bracket (80) to which the cylinder (71) is fixed (welded) functions as a mounting surface for the bottom of the cylinder (71). When the length of the leg portion (74c1) is changed, the height of the upper portion of the top plate portion (74c2) from the bottom plate (23) is changed. For example, the length of the leg portion (74c1) may be changed by replacing the existing leg portion (74c1) of the adjustment member (74c) with a leg portion (74c1) having a different length. In this case, only the leg portion (74c1) may be replaced, or the adjustment member (74c) itself may be replaced. Also, for example, the leg portion (74c1) may include a first rod and a second rod connected to each other so as to be slidable in the vertical direction, and the length of the leg portion (74c1) may be changed by changing the sliding distance of the second rod relative to the first rod. In addition, the height of the installation surface of the cylinder (71) from the bottom plate (23) may be adjusted by the vertical length of the protective member (74c3), and the height of the installation surface of the cylinder (71) from the bottom plate (23) may be adjusted by the vertical length of the top plate portion (74c2).Thus, the adjusting member (74c) functions as a height adjusting member that determines the height of the installation surface of the bottom surface of the cylinder (71) from the bottom plate (23).

[0052] The protective member (74c3) further functions to protect the connecting pipe (72) and the control valve (73). The protective member (74c3) has a partition wall (74c31) that surrounds the connecting pipe (72) and the control valve (73). The partition wall (74c31) has an opening (74c32) that exposes the control valve (73) located therein to the outside of the partition wall (74c31).

[0053] (3-8) Access Port As shown in FIGS. 3 and 4, an access port (A) is formed on the front side of the casing (21). The front plate (26) is provided with a front panel (26a) that is detachable from the main body. By removing the front panel (26a), the access port (A) is exposed to the outside of the casing (21). By removing the front wall (64) from the soundproofing member (60), the internal equipment of the casing (21) is 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. A worker on the front side of the casing (21) can access the compressor (12) and the cylinder (71) through the access port (A). The worker can perform maintenance on the compressor (12) and operate the control valve (73) through the opening (74c32).

[0054] (4) Features Related to Arrangement of Compressor and Refrigerant Cylinder As shown in FIGS. 3 and 5 , the compressor (12) and the cylinder (71) are directly or indirectly installed (fixed) to the bottom plate (23). In this embodiment, the compressor (12) is indirectly installed (fixed) to the bottom plate (23) via a support plate (51) and an elastic support portion (52). In addition, in this embodiment, the cylinder (71) is indirectly installed (fixed) to the bottom plate (23) via a protective member (74c3). In this embodiment, the compressor (12) and the cylinder (71) are directly or indirectly installed 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).

[0055] 7(a) and 7(b), if the distance between the compressor (12) and the cylinder (71) is D, the height from the bottom plate (23) to the upper corner (12e) of the compressor (12) is H1, and the height of the cylinder (71) from the bottom plate (23) is H2, the relationship of the following equation 1 is established. The distance between the compressor (12) and the cylinder (71) is the shortest distance between the compressor (12) and the cylinder (71) in a plan view (as viewed in the third direction). The upper corner (12e) of the compressor (12) is a welded portion between the first end casing (12a2) and the body casing (12a1) of the compressor casing (12a), and is located, for example, at the lower end of the first end casing (12a2). In addition, the corners (12e) at the top of the compressor (12) tend to be highly rigid because they are welded parts. Therefore, if the corners (12e) at the top of the compressor (12) collide with the body portion (71a) of the cylinder (71), the cylinder (71) is likely to be damaged.

[0056] (Math. 1) H1×sinθ≧H2 θ=tan －１ (H2 / D)

[0057] (5) Effect As described above, by configuring the compressor so that the above-mentioned mathematical expression 1 is satisfied, as shown in Fig. 8, for example, when the casing (21) falls (when the casing (21) falls with the compressor (12) positioned above the cylinder (71)) and comes into contact with the ground, the compressor (12) becomes detached from the bottom plate (23) (or the support plate (51)) due to the impact, and the compressor (12) falls toward the cylinder (71), causing the compressor (12) to collide with the upper part (71b) of the cylinder (71). Specifically, when the compressor (12) falls toward the cylinder (71), the vertical center part (body part casing (12a1)) of the compressor (12) or the upper part (first end part casing (12a2)) of the compressor (12) collides with the upper part (71b) of the cylinder (71). The compressor (12) does not collide with the body portion (71a) of the cylinder (71). This prevents the compressor (12) from colliding with the body portion (71a), which is a more fragile portion of the cylinder (71) than the upper and lower ends, even if the compressor (12) falls toward the cylinder (71). This prevents the cylinder (71) from being damaged. Furthermore, the upper corners (12e) of the compressor (12), which tend to be highly rigid, are prevented from colliding with the body portion (71a) of the cylinder (71). This prevents the cylinder (71) from being damaged. The body portion (71a) of the cylinder (71) is a portion located in the vertical center of the cylinder (71).

[0058] (6) Modifications The above embodiment may be modified as follows: The following describes the differences from the above embodiment.

[0059] (6-1) Modification 1 The rigidity of the protective member (74c3) (adjusting member (74c)) may be lower than the rigidity of the cylinder (71). In this way, even if the compressor (12) falls toward the cylinder (71) and collides with the cylinder (71), the protective member (74c3) (adjusting member (74c)) can easily deform, thereby absorbing the impact caused by the collision between the compressor (12) and the cylinder (71).

[0060] (6-2) Modification 2 As shown in FIG. 9( a), the distance D between the compressor (12) and the cylinder (71) may be equal to or greater than the height H3 from the bottom plate (23) to the upper end of the compressor (12). As a result, even if the compressor (12) falls toward the cylinder (71), as shown in FIG. 9( b), the compressor (12) does not reach the cylinder (71). As a result, even if the compressor (12) falls toward the cylinder (71), the compressor (12) does not collide with the cylinder (71). As a result, even if the compressor (12) falls toward the cylinder (71), the compressor (12) is prevented from colliding with the body portion (71 a) of the cylinder (71), and therefore damage to the cylinder (71) can be prevented.

[0061] Although the embodiments and modifications have been described above, it will be understood that various modifications in form and detail are possible without departing from the spirit and scope of the claims. Furthermore, elements of the above embodiments, modifications, and other embodiments may be combined or substituted as appropriate. Furthermore, the terms "first," "second," "third," etc. in the specification and claims are used to distinguish between terms to which these terms are attached, and do not limit the number or order of those terms.

[0062] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for heat source devices.

[0063] REFERENCE SIGNS LIST 1 heat source device 11 refrigerant circuit 12 compressor 12e corner portion 21 casing 71 cylinder 74c height adjustment member (adjustment member) 711 outlet

Claims

1. A heat source device comprising: a compressor (12) included in a refrigerant circuit (11) that performs a refrigeration cycle; a cylinder (71) that stores a flammable refrigerant to be filled into the refrigerant circuit (11) and has an outlet (711) at a bottom thereof for discharging the flammable refrigerant; a casing (21) having a bottom plate (23) on which the compressor (12) and the cylinder (71) are placed; and a height adjusting member (74c) that determines the height of the installation surface of the bottom of the cylinder (71) from the bottom plate (23), wherein the relationship of the following equation 1 holds when the distance between the compressor (12) and the cylinder (71) is D, the height from the bottom plate (23) to an upper corner (12e) of the compressor (12) is H1, and the height of the cylinder (71) from the bottom plate (23) is H2. (Equation 1) H1×sin θ≧H2 θ=tan －１ (H2 / D) 2. The heat source device according to claim 1, wherein the rigidity of the adjustment member (74c) is lower than the rigidity of the cylinder (71).

3. A heat source device comprising: a compressor (12) connected to a refrigerant circuit (11) that performs a refrigeration cycle; a cylinder (71) that stores a flammable refrigerant to be filled into the refrigerant circuit (11) and has an outlet (711) at its bottom for discharging the flammable refrigerant; a casing (21) having a bottom plate (23) on which the compressor (12) and the cylinder (71) are placed; and a height adjustment member (74c) that determines the height of the installation surface of the bottom of the cylinder (71) from the bottom plate (23), wherein the distance between the compressor (12) and the cylinder (71) is equal to or greater than the height from the bottom plate (23) to the upper end of the compressor (12).

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