Heat source device

Abstract

This heat source device comprises: a compressor (12) included in a refrigerant circuit (11) for execution of a refrigeration cycle; a cylinder (71) that stores a combustible refrigerant to fill the refrigerant circuit (11) and has, in a lower part thereof, a discharge port (711) for discharging the combustible refrigerant; an accumulator (17) connected to the compressor (12); and a casing (21) that has a bottom plate (23) on which the compressor (12), the cylinder (71), and the accumulator (17) are mounted. In a top view, a first virtual line (L1) connecting the center (12b) of the compressor (12) and the center (71b) of the cylinder (71), and a second virtual line (L2) connecting the center (12b) of the compressor (12) and the center (17b) of the accumulator (17) form a predetermined angle (θ).

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 and an accumulator connected to a refrigerant circuit, the compressor being mounted 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, a refrigerant cylinder, and an accumulator. When the casing falls to the ground, the side of the bottom plate may contact the ground with the ground. In this case, the impact of the fall may displace the compressor and collide with the accumulator, and the accumulator may be displaced by the impact from the compressor, causing the compressor to collide with the refrigerant cylinder through the accumulator. Furthermore, unlike the compressor, the accumulator is generally not wrapped in insulation and has a smaller diameter than the compressor, making it more rigid. As a result, if the compressor and the accumulator are aligned, and the compressor and the refrigerant cylinder collide repeatedly across the accumulator, the impact from the compressor is applied to the refrigerant cylinder through the accumulator, which is smaller in diameter and more rigid than the compressor. This raises the concern that the cylinder may be damaged when the compressor collides with the accumulator across the cylinder. Damage to the refrigerant cylinder could result in refrigerant leakage into the air. The term "successive collisions" refers to the compressor and the accumulator coming into contact, then displacing as a unit and colliding with the cylinder.

[0006] The object of the present disclosure is to prevent an increase in the impact received by the cylinder when the casing is dropped with the compressor positioned above the cylinder.

[0007] The first aspect relates to a heat source device, the heat source device including: a compressor (12) included in a refrigerant circuit (11) performing a refrigeration cycle; a cylinder (71) for storing a flammable refrigerant to be filled into the refrigerant circuit (11) and having, at a lower part thereof, an outlet (711) for discharging the flammable refrigerant; 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 placed, wherein, in a top view, a first imaginary line (L1) connecting a center (12b) of the compressor (12) and a center (71b) of the cylinder (71) forms a predetermined angle (θ).

[0008] In the first aspect, the first imaginary line (L1) and the second imaginary line (L2) are arranged to form a predetermined angle (θ) with each other, so that 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. As a result, when the casing (21) is dropped with the compressor (12) positioned above the cylinder (71), the center (12b) of the compressor (12) is not aligned on a straight line with the center (17b) of the accumulator (17). When the center (17b) of the accumulator (17) and the center (71b) of the cylinder (71) are aligned in a straight line, the compressor (12), the accumulator (17) and the cylinder (71) collide with each other successively, and it is possible to prevent all of the impact received by the accumulator (17) from the compressor (12) from being directed from the accumulator (17) to the cylinder (71). This makes it possible to prevent an increase in the impact received by the cylinder (71).

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

[0010] In the second aspect, when the casing (21) falls in a position in which the compressor (12) is positioned above the cylinder (71), the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned in a straight line, and successive collisions between the compressor (12), the accumulator (17), and the cylinder (71) can be avoided, thereby preventing an increase in the impact on the cylinder (71).

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

[0012] In the third aspect, when the casing (21) falls in a position in which the compressor (12) is positioned above the cylinder (71), the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned in a straight line, and successive collisions between the compressor (12), the accumulator (17), and the cylinder (71) can be avoided, thereby preventing an increase in the impact on the cylinder (71).

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

[0014] In the fourth aspect, when the casing (21) falls in a position in which the compressor (12) is positioned above the cylinder (71), the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned in a straight line, and successive collisions between the compressor (12), the accumulator (17), and the cylinder (71) can be avoided, thereby preventing an increase in the impact on the cylinder (71).

[0015] A fifth aspect is the first aspect, wherein the predetermined angle (θ) is 90 degrees or greater.

[0016] In the fifth aspect, when the casing (21) falls in a position in which the compressor (12) is positioned above the cylinder (71), the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned in a straight line, and successive collisions between the compressor (12), the accumulator (17), and the cylinder (71) can be avoided, thereby preventing an increase in the impact on the cylinder (71).

[0017] In a sixth aspect, in the third aspect, the predetermined angle (θ) is an angle at which a part of the accumulator (17) not including the center (17b) is located within the region (M) when viewed from above.

[0018] In the sixth aspect, when the compressor (12) falls toward the cylinder (71), it comes into contact with the accumulator (17) before coming into contact with the cylinder (71), thereby suppressing the force that causes the compressor (12) to fall.

[0019] A seventh aspect is any one of the first to sixth aspects, wherein 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).

[0020] In the seventh aspect, when the accumulator (17) falls, it can be prevented from colliding with the body (71d) of the cylinder (71).

[0021] In an eighth aspect, in any one of the first to seventh aspects, a height adjusting member is provided for determining the height of an installation surface of the accumulator (17) from the bottom plate (23).

[0022] In the eighth aspect, the accumulator (17) can be arranged so that the accumulator (17) is higher than the cylinder (71).

[0023] 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 the 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 diagram showing the positional relationship between the compressor, the cylinder, and the accumulator, as viewed from above. FIG. 7 is a diagram showing the positional relationship between the compressor, the cylinder, and the accumulator, as viewed from above. FIGS. 8(a) and 8(b) are diagrams showing the compressor, the cylinder, and the accumulator when the casing is dropped with the compressor positioned above the cylinder. FIGS. 9(a) to 9(c) are diagrams showing the compressor, the cylinder, and the accumulator when the casing is dropped with the compressor positioned above the cylinder. FIG. 10 shows a state in which the casing falls with the compressor positioned above the cylinder, and the compressor collides repeatedly with the refrigerant cylinder across the accumulator, with the centers of the compressor, accumulator, and cylinder aligned in a straight line.

[0024] 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.

[0025] (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.

[0026] 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.

[0027] 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).

[0028] (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).

[0029] 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).

[0030] 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).

[0031] 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.

[0032] (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.

[0033] (2) Outdoor Unit The configuration of the outdoor unit (20) will be described in detail with reference to FIGS. 2 to 5. In the following description, terms such as "upper," "lower," "right," "left," "front," and "rear" refer to the directions indicated by the arrows in FIG. 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, a solenoid valve, an internal heat exchanger, a filter, piping insulation, and the like. The outdoor unit (20) has a partition member (45) that partitions the casing (21) and a fan (30) that transports outdoor air.

[0034] (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).

[0035] 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).

[0036] 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 in this embodiment, the cylinder (71) is located closer to the side surface (21a) than the compressor (12).

[0037] (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).

[0038] 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.

[0039] 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).

[0040] 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).

[0041] (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).

[0042] (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). A heat insulating material (not shown) is wrapped around the compressor (12). 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.

[0043] (3-2) Water Heat Exchanger 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).

[0044] (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).

[0045] (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 a vertically elongated hollow cylindrical shape whose height is greater than its 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, the accumulator (17) is not wrapped with a heat insulating material.

[0046] (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.

[0047] 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.

[0048] 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).

[0049] In this embodiment, the cylinder (71) of the filling unit (70) is not supported by the support plate (51) but is fixed on the bottom plate (23).

[0050] (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).

[0051] 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.

[0052] 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.

[0053] 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).

[0054] (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 (74).

[0055] 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.

[0056] 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).

[0057] As shown in FIGS. 1 and 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.

[0058] 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).

[0059] 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).

[0060] The protective member (74) has a function of protecting the connecting pipe (72) and the regulating valve (73). The protective member (74) also has a function of supporting the cylinder (71) from below. The protective 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) refers to the upper surface (23a) of the bottom plate (23) in the vertical direction. The protective member (74) has a partition wall (74a) surrounding the connecting pipe (72) and the regulating valve (73), and an adjustment member (74c). The partition wall (74a) has an opening (74b) that exposes the regulating valve (73) therein to the outside of the partition wall (74a).

[0061] The adjustment member (74c) is, for example, a metal member and includes legs (74c1) and a top plate (74c2). 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 top surface of the top plate (74c2) is where the cylinder (71) is placed and functions as a placement surface for the cylinder (71). When the length of the legs (74c1) is changed, the height of the top surface of the top plate (74c2) from the bottom plate (23) is changed. For example, the length of the legs (74c1) of the adjustment member (74c) may be changed by replacing the existing legs (74c1) with legs (74c1) having 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 plate portion (74c2) may be replaced. Alternatively, 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 amount of sliding of the second rod relative to the first rod. This allows the adjustment member (74c) to function as a height adjustment member that determines the height of the installation surface of the cylinder (71) from the bottom plate (23).

[0062] (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 sound-proofing 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 (74b).

[0063] (4) Characteristics of the Arrangement of the Compressor, Accumulator, and Refrigerant Cylinder As shown in FIG. 6 , in a top view (viewed vertically from above), the angle (α) formed between a first imaginary line (L1) and a second imaginary line (L2) forms a predetermined angle (θ). The first imaginary line (L1) is an imaginary line connecting the center (12b) of the compressor (12) and the center (71b) of the cylinder (71). The second imaginary line (L2) is an imaginary line connecting the center (12b) of the compressor (12) and the center (17b) of the accumulator (17). The center (12b) of the compressor (12) is the center of the outer periphery of the casing (compressor casing (12a)) of the compressor (12), which is substantially circular 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), which is substantially circular 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), which is substantially circular in top view. The angle (α) between the first imaginary line (L1) and the second imaginary line (L2) is the smaller of the two angles formed by the first imaginary line (L1) and the second imaginary line (L2).

[0064] 7, the predetermined angle (θ) is an angle at which the center (17b) of the accumulator (17) is located at a position away from a region (M) located between the compressor (12) and the cylinder (71) in a top view. The region (M) is a region located, in a top view, between the compressor (12), the cylinder (71), and two common tangents (N1, N2) that do not intersect with the first imaginary line (L1) among the common tangents to the outer periphery of the compressor casing (12a) and the outer periphery of the casing (71a) of the cylinder (71).

[0065] In general, the accumulator (17) is not wrapped with a heat insulating material, unlike the compressor (12), and is smaller in diameter and more rigid than the compressor (12). Therefore, when the accumulator (17) collides with the cylinder (71), the cylinder (71) is likely to receive a large impact.

[0066] In this embodiment, when viewed from above, the angle (α) formed by the first virtual line (L1) and the second virtual line (L2) is configured to be a predetermined angle (θ), so that the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are not arranged to be aligned in a straight line. 8(a) and 8(b), for example, when the casing (21) falls (the casing (21) falls in an orientation in which the compressor (12) is located above the cylinder (71)) and comes into contact with the ground, the impact causes the compressor (12) to come off the bottom plate (23) (or the support plate (51)) and displace toward the cylinder (71), and if the accumulator (17) is not located within the region (M), the compressor (12) collides with the cylinder (71) without colliding with it, thereby preventing 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, thereby preventing the accumulator (17) from colliding with the cylinder (71). According to this, for reasons such as the above-mentioned accumulator (17) being more rigid than the compressor (12), the impact on the cylinder (71) is smaller when the compressor (12) directly collides with the cylinder (71) than when the accumulator (17) directly collides with the cylinder (71), and therefore it is possible to prevent an increase in the impact on the cylinder (71). Arrow Z in the figure indicates the falling direction of the casing (21) when it falls from the side surface (21 a).

[0067] Furthermore, as shown in Figure 9(a), if the center (17b) of the accumulator (17) is not located within the region (M) but a part of the accumulator (17) is located therein, the compressor (12) will be displaced toward the cylinder (71) due to the impact of the falling casing (21) and will collide with the accumulator (17). As a result, the accumulator (17) will be displaced together with the compressor (12), and as shown in Figure 9(b) or Figure 9(c), the accumulator (17) will collide with the cylinder (71). However, at the time of collision, 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 (see FIG. 10), and the accumulator (17) collides with the cylinder (71) in a state where the center (17b) of the accumulator (17) is shifted from the first imaginary line (L1) connecting the center (12b) of the compressor (12) and the center (71b) of the cylinder (71), as shown in FIG. 9(b) or 9(c). In the state shown in FIG. 9(b), the accumulator (17) collides with the cylinder (71) in a state where the center (17b) of the accumulator (17) is shifted from the first imaginary line (L1), and further, the compressor (12) collides with the cylinder (71). In the case shown in Figure 9(b), part of the impact (force transmitted from the compressor (12)) (F) transmitted from the compressor (12) to the accumulator (17) acts in a direction perpendicular to the direction in which the force is transmitted from the accumulator (17) to the cylinder (71), thereby suppressing the force acting from the accumulator (17) to the cylinder (71). Furthermore, in the case shown in Figure 9(b), the compressor (12) collides with the cylinder (71), but the momentum is reduced by the collision of the compressor (12) with the accumulator (17), so that an increase in the impact received by the cylinder (71) can be suppressed. In the case shown in Figure 9(c), the compressor (12) collides with the cylinder (71) with the accumulator (17) in between, but the impact (F) transmitted from the compressor (12) to the accumulator (17) is distributed into a portion (F1) directed toward the cylinder (71) and a portion (F2) directed in a direction away from the cylinder (71).This makes it possible to prevent all of the impact (F) received by the accumulator (17) from the compressor (12) when the accumulator (17) collides with the compressor (12) from being directed from the accumulator (17) toward the cylinder (71), and to disperse a part (F2) of the impact in a direction away from the cylinder (71) (a direction away from the first imaginary line (L1)), thereby preventing the impact received by the cylinder (71) from the accumulator (17) from increasing. As a result, when the casing (21) falls in an orientation in which the compressor (12) is located above the cylinder (71), it is possible to prevent the impact received by the cylinder (71) from increasing.

[0068] As shown in Fig. 7 , the predetermined angle (θ) may be an angle at which the accumulator (17) (the entire accumulator (17)) is located at a position away from a region (M) located between the compressor (12) and the cylinder (71) in a top view. The predetermined angle (θ) may be 90 degrees or greater. This prevents the compressor (12) from colliding with the cylinder (71) when the casing (21) is dropped with the compressor (12) positioned above the cylinder (71). Therefore, the accumulator (17) does not collide with the cylinder (71). This prevents an increase in the impact on the cylinder (71).

[0069] Furthermore, the predetermined angle (θ) may be an angle at which the accumulator (17) (the entire accumulator (17)) is not located on a portion (L11) of the first imaginary line (L1) that is located between the compressor (12) and the cylinder (71) in a top view (see FIG. 6 ). In other words, the predetermined angle (θ) may be an angle at which the accumulator (17) is located at a position away from the first imaginary line (L1) in a top view. According to this, even if the casing (21) falls in a position in which the compressor (12) is positioned above the cylinder (71) and the compressor (12) collides with the cylinder (71) with the accumulator (17) sandwiched between them, the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are aligned in a straight line as shown in Figure 10, thereby preventing successive collisions between the compressor (12), the accumulator (17), and the cylinder (71). This results in a state as shown in Figure 9(b) or Figure 9(c), thereby preventing an increase in the impact on the cylinder (71).

[0070] 9( a), the predetermined angle (θ) may be an angle at which the center (17b) of the accumulator (17) is located outside the region (M) and a part of the accumulator (17) excluding the center (17b) is located within the region (M). In this way, when the compressor (12) tilts toward the cylinder (71), it comes into contact with the accumulator (17) before coming into contact with the cylinder (71), thereby suppressing the force that causes the compressor (12) to tilt.

[0071] (5) Modification: 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). This allows the body (17c) of the accumulator (17) to collide with the upper part (71c) of the cylinder (71), even if the accumulator (17) falls toward the cylinder (71) due to the impact of, for example, the casing (21) falling and contacting the ground. As a result, the accumulator (17) is prevented from colliding with the body (71d), which is a more fragile part of the cylinder (71) than the upper and lower ends, thereby preventing damage to the cylinder (71). The body (71d) of the cylinder (71) is a vertically central part of the cylinder (71).

[0072] The heat source device (1) may include a height adjustment member that determines the height of the installation 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). The height adjustment member is, for example, a metal member and includes a top plate portion including an installation surface on which the accumulator (17) is installed, and legs disposed between the top plate portion and the bottom plate (23). Changing the length of the legs changes the height of the installation surface of the top plate portion from the bottom plate (23). For example, the length of the legs may be changed by replacing existing legs of the height adjustment member with legs having a different length. In this case, only the legs may be replaced, or the height adjustment member itself may be replaced. Alternatively, for example, the legs may include a first rod and a second rod connected to be slidable in the vertical direction, and the length of the legs may be changed by changing the sliding distance of the second rod relative to the first rod. This allows the height adjustment member to determine the height of the installation surface of the accumulator (17) from the bottom plate (23), thereby enabling the accumulator (17) to be positioned such 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] 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.

[0074] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for heat source devices.

[0075] 1 heat source device 11 refrigerant circuit 12 compressor 12b compressor center 17 accumulator 17b accumulator center 21 casing 23 bottom plate 71 cylinder 71b cylinder center L1 first virtual line L2 second virtual line θ predetermined angle

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, at a lower part thereof, an outlet (711) for discharging the flammable refrigerant; 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 placed; wherein, in top view, an angle (α) formed by a first imaginary line (L1) connecting a center (12b) of the compressor (12) and a center (71b) of the cylinder (71) and a second imaginary 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 device according to claim 1, wherein the predetermined angle (θ) is an angle at which, in a top view, the accumulator (17) is not located on a portion (L11) of the first imaginary line (L1) that is located between the compressor (12) and the cylinder (71).

3. The heat source device according to claim 1, wherein the predetermined angle (θ) is an angle at which the center (17b) of the accumulator (17) is located at a position away from a region (M) located between the compressor (12) and the cylinder (71) when viewed from above.

4. The heat source device of claim 1, wherein the predetermined angle (θ) is an angle at which the accumulator (17) is located at a position away from an area (M) located between the compressor (12) and the cylinder (71) when viewed from above.

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

6. A heat source device as described in claim 3, wherein the predetermined angle (θ) is an angle at which a portion of the accumulator (17) excluding the center (17b) is located within the region (M) when viewed from above.

7. A heat source device according to any one of claims 1 to 6, wherein 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).

8. A heat source device according to any one of claims 1 to 7, further comprising a height adjustment member for determining the height of the installation surface of the accumulator (17) from the bottom plate (23).

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