Heat source device

Abstract

This reduces the impact when the compressor collides with the cylinder during casing descent. [Solution] The heat source device comprises a cylinder (71) that stores flammable refrigerant for filling a refrigerant circuit (11) and has an outlet (71a) at its bottom for discharging the flammable refrigerant, and a casing (21) having a compressor (12) and a bottom plate (23) on which the cylinder (71) is installed. The cylinder (71) is positioned between the compressor (12) and the side edge (23a) of the bottom plate (23). The first straight line (L1) is defined as a straight line that passes through the center of gravity of the compressor (12) and the center of gravity of the cylinder (71) in a top view of the bottom plate (23). The second straight line (L2) is defined as a straight line that is perpendicular to the side edge (23a) of the bottom plate (23) and passes through the center of gravity of the compressor (12) in a top view. The first straight line (L1) and the second straight line (L2) form a predetermined angle (θ1).

Description

Technical Field

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

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] [[ID=CO]] The inventors of the present application have created a configuration in which a cylinder is provided inside the casing of the heat source device. The cylinder stores a refrigerant for filling the refrigerant circuit. As a result, when installing the heat source device, the refrigerant can be filled into the refrigerant circuit from the cylinder, so there is no need to separately prepare the refrigerant for filling. On the other hand, in a configuration using a flammable refrigerant and providing a cylinder inside the casing, the following specific problems occur.

[0005] During transportation before the heat source device is installed at the site, there is a risk that the casing may fall. Here, a compressor and a cylinder are provided inside the casing. When the casing falls to the ground, the compressor may be located above the cylinder. In this case, if the compressor collides with the cylinder due to the impact of the fall, the cylinder may be damaged and the refrigerant may leak into the air.

[0006] An object of the present disclosure is to reduce the impact when the compressor collides with the cylinder when the casing falls.

Means for Solving the Problems

[0007] The first embodiment relates to a heat source device. The heat source device comprises a compressor (12) included in a refrigerant circuit (11) that performs a refrigeration cycle, a cylinder (71) that stores flammable refrigerant for filling the refrigerant circuit (11) and has an outlet (71a) at its bottom for discharging the flammable refrigerant, and a casing (21) having a bottom plate (23) on which the compressor (12) and the cylinder (71) are installed. The cylinder (71) is positioned between the compressor (12) and the side (23a) of the bottom plate (23). The first straight line (L1) is defined as a straight line passing through the center of gravity of the compressor (12) and the center of gravity of the cylinder (71) in a top view of the base plate (23), and the second straight line (L2) is defined as a straight line perpendicular to the side edge (23a) of the base plate (23) and passing through the center of gravity of the compressor (12) in a top view, with the first straight line (L1) and the second straight line (L2) forming a predetermined angle (θ1).

[0008] In the first embodiment, when the casing (21) contacts the ground with a first straight line (L1) passing through the center of gravity of the compressor (12) and the center of gravity of the cylinder (71) coinciding with the direction of gravity, the side (23a) of the bottom plate (23) becomes tilted with respect to the ground. As a result, deformation of the bottom plate (23) when it contacts the ground can be promoted. Therefore, the kinetic energy of the compressor (12) can be absorbed by the deformation of the bottom plate (23), and the impact acting from the compressor (12) to the cylinder (71) can be reduced.

[0009] In the second embodiment, the heat source device further comprises a support plate (51) that supports the compressor (12) from below, and an elastic support part (52) fixed on the bottom plate (23) that supports the support plate (51) from below. The cylinder (71) is not supported by the support plate (51) but is fixed on the bottom plate (23). Here, the cylinder (71) may be fixed directly on the bottom plate (23) or indirectly on the bottom plate (23) via other parts.

[0010] In the second embodiment, the compressor (12) is fixed to the bottom plate (23) via an elastic support (52), and the cylinder (71) is fixed to the bottom plate (23) without the elastic support (52). Therefore, when the casing (21) falls, the downward acceleration of the compressor (12) is smaller than the downward acceleration of the cylinder (71). As a result, the impact acting on the cylinder (71) from the compressor (12) can be reduced.

[0011] A third aspect is that, in the first aspect, the heat source device further comprises a support plate (51) that supports the compressor (12) and cylinder (71) from below, and an elastic support part (52) fixed on the bottom plate (23) and supporting the support plate (51) from below. Here, the elastic support part (52) may be directly fixed on the bottom plate (23) or indirectly fixed on the bottom plate (23) via other parts.

[0012] In the third embodiment, both the compressor (12) and the cylinder (71) are fixed to the support plate (51). Therefore, when the casing (21) comes into contact with the ground, the portion of the support plate (51) between the compressor (12) and the cylinder (71) deforms. As a result, the kinetic energy of the compressor (12) can be absorbed by the deformation of the support plate (51), thereby reducing the impact acting from the compressor (12) to the cylinder (71).

[0013] In a fourth embodiment, the heat source device further comprises a buffer member (80) positioned between the compressor (12) and the cylinder (71) in any one of the first to third embodiments.

[0014] In the fourth embodiment, when the casing (21) falls, the cushioning member (80) reduces the impact that acts on the cylinder (71) from the compressor (12).

[0015] In the fifth embodiment, in the fourth embodiment, the buffer member (80) is an element of the refrigerant circuit (11).

[0016] In the fifth embodiment, the elemental components of the refrigerant circuit (11) can be used as buffer members (80).

[0017] In the sixth invention, in the fifth aspect, the component parts include a hydrothermal exchanger (15) or refrigerant piping.

[0018] In the sixth invention, the hydrothermal exchanger (15) or refrigerant piping can be used as the buffer member (80).

[0019] In the seventh aspect, in any one of the first to sixth aspects, the heat source device further includes a sound insulation member (60) surrounding the compressor (12).

[0020] In the seventh aspect, when the casing (21) falls, the sound insulation member (60) can reduce the impact acting on the cylinder (nozzle) (71).

[0021] In the eighth aspect, in the seventh aspect, the cylinder (nozzle) (71) is arranged outside the sound insulation member (60).

[0022] In the eighth aspect, a part of the sound insulation member (60) is arranged between the compressor (12) and the cylinder (nozzle) (71). Therefore, when the casing (21) falls, a part of the sound insulation member (60) can reduce the impact acting on the cylinder (nozzle) (71) from the compressor (12).

[0023] In the ninth aspect, in any one of the first to eighth aspects, the heat source device further includes a sound absorption material (90) arranged to overlap the outer surface or inner surface of the casing (21).

[0024] In the ninth aspect, when the casing (21) falls, the sound absorption material (90) can reduce the impact acting on the cylinder (nozzle) (71).

[0025] In the tenth aspect, the first position (P1) is defined as the position of the intersection of the first straight line (L1) and the side (23a) in a top view. The second position (P2) is defined as the position of the intersection of the second straight line (L2) and the side (23a) in a top view. The third position (P3) is defined as the position of the end (E1) of the side (23a) in a top view. The distance between the first position (P1) and the third position (P3) is shorter than the distance between the first position (P1) and the second position (P2).

[0026] In the tenth aspect, the first straight line passing through the center of gravity of the compressor (12) and the center of gravity of the cylinder (71) is closer to the end (E1) of the side (23a). When the casing (21) contacts the ground in a state where the first straight line (L1) passing through the center of gravity of the compressor (12) and the center of gravity of the cylinder (71) coincides with the direction of gravity, the end (E1) of the side (23a) is likely to hit the ground (G), so the amount of deformation of the bottom plate (23) increases. Therefore, the kinetic energy of the compressor (12) can be absorbed by the deformation of the bottom plate (23), and the impact acting on the cylinder (71) from the compressor (12) can be reduced.

[0027] In the eleventh aspect, in any one of the first to tenth aspects, the casing (21) has a first side surface (26) having an access port (A) and a second side surface (24) corresponding to the side (23a) of the bottom plate (23). The first straight line (L1) is displaced by a predetermined angle (θ1) toward the first side surface (26) with respect to the second straight line (L2).

[0028] In the eleventh aspect, since the first straight line (L1) is displaced by an angle (θ1) toward the first side surface (26) with respect to the second straight line (L2), the impact acting on the cylinder (71) can be reduced. Since the cylinder (71) is close to the access port (A), the work of filling the refrigerant of the cylinder (71) into the refrigerant circuit (11) becomes easy.

[0029] In the twelfth aspect, in any one of the first to eleventh aspects, the casing (21) houses the entire refrigerant circuit (11).

[0030] In the twelfth embodiment, the entire closed-circuit refrigerant circuit (11) is provided within the casing (21). Therefore, compared to, for example, a separate-type refrigeration cycle system, the amount of refrigerant required to fill the refrigerant circuit (11) is reduced, allowing the cylinder (71) to be made smaller. As a result, the rigidity of the cylinder (71) can be increased, and damage to the cylinder (71) can be suppressed. [Brief explanation of the drawing]

[0031] [Figure 1] Figure 1 is a schematic piping diagram of the refrigerant circuit of the heat source device according to the embodiment. [Figure 2] Figure 2 is a schematic perspective view of the outdoor unit. [Figure 3] Figure 3 is a front view of the outdoor unit, showing the front access opening of the machine room open. [Figure 4] Figure 4 is a schematic plan view showing the interior of the outdoor unit. [Figure 5] Figure 5 is a side view of the inside of the outdoor unit, seen from the right side with the side panel removed. [Figure 6] Figure 6 is a schematic diagram showing the top view of the inside of the outdoor unit, illustrating the positional relationship between the compressor, cylinder, and sides. [Figure 7] Figure 7 is a schematic diagram showing the relative positions of the compressor, cylinder, and sides of the casing of the comparative example heat source device during a drop under the first condition. [Figure 8] Figure 8 is a schematic diagram showing the positional relationship between the compressor, cylinder, and side of the casing of the embodiment during a fall under the first condition. [Figure 9] Figure 9 is a schematic diagram showing the positional relationship between the compressor, cylinder, and side of the casing of the embodiment during a fall under the second condition. [Figure 10] Figure 10 is a schematic diagram showing the positional relationship between the compressor, cylinder, and side of the casing of the heat source device in Modification 1 during a fall under the second condition. [Figure 11]Figure 11 is a schematic diagram showing the positional relationship between the compressor, cylinder, and side of the heat source device in Modification 2 during the fall under the first condition. [Figure 12] Figure 12 is a diagram corresponding to Figure 4 of the heat source device in Modification Example 3. [Figure 13] Figure 13 is a diagram corresponding to Figure 6 of the heat source device in Modification 4. [Figure 14] Figure 14 is a diagram corresponding to Figure 6 of another embodiment of the heat source device in Modification 4. [Modes for carrying out the invention]

[0032] The embodiments of this disclosure will be described in detail below with reference to the drawings. However, this disclosure is not limited to the embodiments shown below, and various modifications are possible without departing from the technical idea of ​​this disclosure. Since the drawings are for conceptual illustration of this disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for ease of understanding.

[0033] (1) Basic configuration of the heat source system 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 device. The heat source device (1) heats water and supplies the heated water to the target. The heat source device (1) has an outdoor unit (20) installed outside. The outdoor unit (20) has a casing (21). The entire closed-circuit refrigerant circuit (11) is housed inside the casing (21). The refrigerant circuit (11) is filled with refrigerant. The refrigerant circuit (11) performs a refrigeration cycle.

[0034] 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 a zero ozone depletion potential and a low global warming potential, making them environmentally friendly. Propane ignites at temperatures below 500°C.

[0035] 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).

[0036] (1-1) Refrigerant circuit As shown in Figure 1, the refrigerant circuit (11) has 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 has a four-way switching valve (16) and an accumulator (17).

[0037] 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 the outside 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 the water in the water circuit (40). The four-way switching valve (16) switches the direction of circulation of the refrigerant. The four-way switching valve (16) switches between a first state (shown by the solid line in Figure 1) in which the first port (16a) and the third port (16c) are connected and the second port (16b) and the fourth port (16d) are connected, and a second state (shown by the dashed line in Figure 1) in which the first port (16a) and the second port (16b) are connected and the third port (16c) and the fourth port (16d) are connected. The accumulator (17) stores the liquid in the refrigerant that is drawn into the compressor (12).

[0038] 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 the heat source device (1) is shipped. After transporting the heat source device (1) to the site, the worker depressurizes the refrigerant circuit (11). Then, when the worker opens the control valve (73), the refrigerant from the cylinder (71) fills the refrigerant circuit (11).

[0039] The refrigerant circuit (11) performs a first refrigeration cycle and a second refrigeration cycle. In Figure 1, the refrigerant flow in the first refrigeration cycle is shown by solid arrows, and the refrigerant flow in the second refrigeration cycle is shown by dashed arrows. In the first refrigeration cycle, the four-way switching valve (16) is in the first state, and the water heat exchanger (15) functions as a heat radiator (condenser) while 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, and the air heat exchanger (13) functions as a heat radiator (condenser) while the water heat exchanger (15) functions as an evaporator.

[0040] (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 targets such as hot water tanks, air conditioning units, and floor heating units. A gas-liquid separator (44) is connected to the water circuit (40). The gas-liquid separator (44) releases refrigerant that has leaked from the refrigerant circuit (11) into the water circuit (40) via the water heat exchanger (15) into the atmosphere.

[0041] (2) Outdoor unit The configuration of the outdoor unit (20) will be described in detail with reference to Figures 2 to 5. In the following description, terms such as "up," "down," "right," "left," "front," and "back" refer to the directions indicated by the arrows in Figure 2. The outdoor unit (20) has a casing (21), equipment for the refrigerant circuit (11), and equipment for the water circuit (40). In addition to the elements described above, the equipment for the refrigerant circuit (11) includes refrigerant piping, solenoid valves, an internal heat exchanger, a filter, and insulation material for the piping. The outdoor unit (20) has a partition member (45) that separates the casing (21) and a fan (30) that transports outdoor air.

[0042] (2-1) Casing and partition members The casing (21) is installed outdoors. The casing (21) is formed in the shape of a hollow box. More precisely, the casing (21) is formed in the shape of a box with part of the left side and rear side open. The casing (21) is formed in the shape of a rectangular parallelepiped with the first direction (left-right direction) being the longitudinal direction and the second direction (front-back direction) being the short direction. The casing (21) is made of metallic 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 top surface of the casing (21), the bottom plate (23) forms the bottom surface of the casing (21), the right plate (24) forms the right side of the casing (21), the left plate (25) forms the left side 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 towards the front of the casing (21) and is continuous with the front plate (26). The rear plate (27) is located towards the right of the casing (21) and is continuous with the right plate (24).

[0043] 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). When viewed from above, the partition member (45) extends in the front-to-back direction. When viewed from above, the partition member (45) may have a curved or bent shape, or may be formed in a curved shape. The partition member (45) divides the inside of the casing (21) into a first chamber, the fan chamber (S1), and a second chamber, the machine chamber (S2). 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).

[0044] The casing (21) has an intake port (28) and an outlet port (29). The intake port (28) is formed on the casing (21) from the rear surface to the left surface of the fan chamber (S1). The outlet port (29) is formed on the front part of the front plate (26) of the casing (21) that faces the fan chamber (S1). In the fan chamber (S1), a flow path is formed from the intake port (28) to the outlet port (29) through which outside air flows.

[0045] (2-2) Configuration of the fan room The fan chamber (S1) is composed of a roughly rectangular parallelepiped space. The length of the fan chamber (S1) in the first direction is greater than its length in the second direction. The fan chamber (S1) is equipped with an air heat exchanger (13), a fan (30), and a bell mouth (31).

[0046] 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 type heat exchanger. The heat transfer tubes of the air heat exchanger (13) are made up of flat multi-hole tubes, but straight tubes may also be used.

[0047] The fan (30) is a propeller fan having 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 base plate (23). The motor (30a) rotates the impeller (30b). The bell mouth (31) is formed in a cylindrical shape around the impeller (30b). The bell mouth (31) is continuous with the air outlet (29).

[0048] In this embodiment, a portion of the air heat exchanger (13) extends into the machine room (S2). The first heat exchange section (13a) is located behind the partition member (45). The first heat exchange section (13a) extends to the right so as to pass through the 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).

[0049] (3) Configuration of the machine room The machine room (S2) is composed of a roughly rectangular parallelepiped space. The length of the machine room (S2) in the first direction is approximately equal to its length in the second direction. The length of the machine room (S2) in the third direction (vertical direction) is greater than its lengths in the first and second directions. The length of the machine room (S2) in the first direction is less than the length of the fan room (S1) in the first direction. The machine room (S2) houses 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).

[0050] (3-1) Compressor The compressor (12) is positioned towards 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 as a vertically elongated hollow cylinder whose height is greater than its outer diameter. The compressor casing (12a) constitutes a sealed pressure vessel. An intake pipe (19) is connected to the top of the compressor (12). A discharge pipe (18) is connected to the body of the compressor (12). The compressor (12) is, for example, a scroll compressor.

[0051] (3-2) Water heat exchanger The water heat exchanger (15) is located towards 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. The first water piping (41), the second water piping (42), and the refrigerant piping (not shown) are connected to the water heat exchanger (15).

[0052] (3-3) Gas-liquid separation device The gas-liquid separator (44) is positioned 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 passage for releasing the gaseous refrigerant separated inside it, and a gas vent valve for opening and closing the discharge passage (not shown).

[0053] (3-4) Accumulator The accumulator (17) is connected to the suction pipe (19). The accumulator (17) is located towards 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 as a vertically elongated hollow cylindrical shape in which its height is greater than its outer diameter.

[0054] (3-5) Vibration isolation mechanism The vibration isolation mechanism (50) suppresses vibrations of the compressor (12) and accumulator (17). The vibration isolation mechanism (50) of this embodiment has 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.

[0055] The compressor (12) is fixed on a support plate (51). The support plate (51) is a roughly triangular plate member 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.

[0056] The vibration isolation mechanism (50) of this embodiment has three elastic support parts (52). Each elastic support part (52) is positioned near the three tops of the support plate (51). The elastic support parts (52) are positioned between the support plate (51) and the bottom plate (23). The elastic support parts (52) directly support the support plate (51) from below. The elastic support parts (52) are made of rubber or urethane. The vibrations of the compressor (12) are damped by the elastic support parts (52) before they are transmitted to the bottom plate (23).

[0057] 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).

[0058] (3-6) Sound insulation materials The sound-insulating member (60) suppresses the propagation of noise from the operation of the compressor (12) to the outside of the casing (21). The sound-insulating member (60) is formed in the shape of a hollow box with an open bottom. The sound-insulating 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-insulating member (60). The right wall (62) faces the right plate (24) and constitutes the right side of the sound-insulating member (60). The left wall (63) faces the partition member (45) and constitutes the left side of the sound-insulating member (60). The front wall (64) faces the front plate (26) and constitutes the front surface of the sound-insulating member (60). The rear wall (65) faces the rear plate (27) and constitutes the rear surface of the sound insulation member (60). The front wall (64) is configured to be detachably attached to the main body of the sound insulation member (60).

[0059] The sound-insulating member (60) is supported by the bottom plate (23) of the casing (21). The sound-insulating member (60) is made of a non-permeable material. The sound-insulating member (60) is made of, for example, a metal plate or a rubber sheet.

[0060] The sound-insulating member (60) forms an internal space (66) surrounding the compressor (12). In this embodiment, equipment such as the compressor (12), accumulator (17), water heat exchanger (15), and filling unit (70) are arranged in the internal space (66).

[0061] The sound-insulating member (60) and the casing (21) are positioned at a predetermined distance from each other. 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 from the compressor (12) during operation from propagating to the outside of the casing (21).

[0062] (3-7) Filling Unit The filling unit (70) is positioned towards the right and front of the machine room (S2). The filling unit (70) includes a cylinder (71), a connecting pipe (72), a control valve (73), and a protective member (74).

[0063] The cylinder (71) stores flammable refrigerant for filling the refrigerant circuit (11). The cylinder (71) is pre-filled with refrigerant when the heat source device (1) is shipped. Therefore, when the heat source device (1) is stored or transported, the cylinder (71) is filled with refrigerant. After the heat source device (1) is installed on-site, and before the heat source device (1) is put into operation, refrigerant is filled from the cylinder (71) into the refrigerant circuit (11). Therefore, when the heat source device (1) is in use, the cylinder (71) is empty.

[0064] The cylinder (71) is formed as a vertically elongated hollow cylindrical shape, with its height greater than its outer diameter. The cylinder (71) constitutes a sealed pressure vessel. The rigidity of the cylinder (71) is less than that of the compressor casing (12a).

[0065] As shown in Figures 1 and 3, an outlet (71a) is formed at the bottom of the cylinder (71). More precisely, the outlet (71a) is formed at the bottom of the cylinder (71). Flammable refrigerants have a relatively high density. By placing the outlet (71a) at the bottom of the cylinder (71), the discharge of the refrigerant can be promoted. In addition, when filling the refrigerant circuit (11) with refrigerant, it is possible to suppress the amount of refrigerant remaining in the cylinder (71).

[0066] 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 outlet (71a) of the cylinder (71) and communicates with the inside 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).

[0067] The control valve (73) is installed in the connecting pipe (72). The control valve (73) adjusts the opening 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).

[0068] The protective member (74) has the function of protecting the connecting pipe (72) and the control valve (73). The protective member (74) further has the function of supporting the cylinder (71) from below. The protective member (74) has a partition wall (74a) surrounding the connecting pipe (72) and the control valve (73). The partition wall (74a) has an opening (74b) that exposes the control valve (73) located inside it to the outside of the partition wall (74a).

[0069] (3-8) Access point As shown in Figures 3 and 4, an access opening (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 opening (A) is exposed to the outside of the casing (21). By removing the front wall (64) from the sound insulation member (60), the equipment inside the casing (21) is exposed to the outside of the casing (21). The compressor (12) and cylinder (71) overlap the access opening (A) in the second direction. A worker on the front side of the casing (21) can access the compressor (12) and cylinder (71) through the access opening (A). The worker can perform maintenance on the compressor (12) and operate the control valve (73) through the opening (74b).

[0070] (4) Features relating to the arrangement of the base plate, compressor, and cylinder The compressor (12) and cylinder (71) are installed directly or indirectly on the base plate (23). The arrangement of the base plate (23), compressor (12), and cylinder (71) will be described in detail with reference to Figure 6. Figure 6 is a schematic diagram of the casing's base plate (23) viewed from above. For convenience, some parts are omitted from the illustration in Figure 6.

[0071] (4-1) Base plate construction The bottom plate (23) is formed in a substantially rectangular shape with the first direction being the longitudinal direction. The bottom plate (23) has four sides. The four sides consist of a right side (23a) formed on its right side, a left side (23b) formed on its left side, a front side (23c) formed on its front side, and a rear side (23d) formed on its rear side. The front plate (26) of the casing (21) corresponds to the front side (23c) and constitutes a first side surface having an access opening (A). The right plate (24) of the casing (21) constitutes a second side surface corresponding to the right side (23a). The right side (23a), the right portion of the front side (23c), and the right portion of the rear side (23d) constitute the machine room side surface located on the machine room (S2) side.

[0072] The right-hand side (23a) of the base plate (23) has a first end (E1) and a second end (E2). The first end (E1) is the front end of the right-hand side (23a). The second end (E2) is the rear end of the right-hand side (23a). In this embodiment, the first end (E1) forms a first corner where the right-hand side (23a) and the front side (23c) are continuous. The second end (E2) forms a second corner where the right-hand side (23a) and the rear side (23d) are continuous.

[0073] (4-2) Arrangement In Figure 6, the first center of gravity (C1) is the center of gravity of the compressor (12) in a top view. The second center of gravity (C2) is the center of gravity of the cylinder (71) in a top view. Here, "top view of the base plate (23)" means the view of the base plate (23) from above in the installed state of the heat source device (1). Here, "center of gravity" refers to the center of mass in a top view, or the center of mass in the horizontal direction. "Center of gravity" is not the center of mass in the vertical direction. The first straight line (L1) is a straight line in a top view that passes through the first center of gravity (C1) of the compressor (12) and the second center of gravity (C2) of the cylinder (71). The second straight line (L2) is a straight line in a top view that is perpendicular to the right side (23a), which is the side of the base plate (23), and passes through the center of gravity of the compressor (12). In other words, the second line (L2) is the perpendicular to the right-hand side (23a) of the base plate (23) in the top view.

[0074] In this embodiment, the first line (L1) and the second line (L2) form a predetermined first angle (θ1). The first angle (θ1) is a predetermined angle greater than 0°. Specifically, the second line (L2) is offset by a first angle (θ1) relative to the first line (L1) toward the front side of the bottom plate (23). In other words, the second line (L2) is offset by a first angle (θ1) relative to the first line (L1) toward the access opening (A).

[0075] (4-3) Issues when the casing falls The heat source device (1) houses a cylinder (71) inside a casing (21). The cylinder (71) stores propane, a flammable natural refrigerant. There is a possibility that the casing (21) may fall during transport of the heat source device (1).

[0076] Figure 7 shows the heat source device of the comparative example. In the heat source device of the comparative example, the first line (L1) and the second line (L2) coincide. In the comparative example, assume that the casing (21) falls and collides with the ground (G) with its right-hand side (23a) parallel to the ground (G). When the casing (21) collides with the ground (G), the compressor (12) moves toward the ground (G) in the direction of gravity. As a result, as shown in Figure 7(B), the compressor (12) collides with the cylinder (71) so as to overlap with it in the vertical direction. When the first line (L1) and the second line (L2) coincide, the load (more precisely, the impact load) acting on the cylinder (71) becomes larger. This is because the vector of the impact load when the compressor (12) collides with the cylinder (71) (white arrow in Figure 7(B)) coincides with the direction of gravity. Here, the impact load is a force directed from the first center of gravity (C1) of the compressor (12) to the second center of gravity (C2) of the cylinder (71). As a result, the cylinder (71) is likely to rupture. If the cylinder (71) ruptures, flammable refrigerant will leak out.

[0077] (4-4) The action of the casing of this embodiment when it falls In this embodiment, the action of the casing (21) when it falls under the following first and second conditions will be explained.

[0078] As shown in Figure 8, the first condition is that the right-hand side (23a) of the bottom plate (23) of the dropped casing (21) contacts the ground (G) in a state parallel to the ground (G). In this embodiment, the first straight line (L1) and the second straight line (L2) form a first angle (θ1). Therefore, as shown in Figure 8(B), the impact load when the compressor (12) collides with the cylinder (71) is reduced. This is because the impact load vector (white arrow in Figure 8(B)) when the compressor (12) collides with the cylinder (71) is shifted by a first angle θ1 with respect to the direction of gravity. As a result, damage to the cylinder (71) can be suppressed, and leakage of flammable refrigerant can be suppressed.

[0079] As shown in Figure 9, the second condition is that the casing (21) contacts the ground when the first straight line (L1) connecting the first center of gravity (C1) of the compressor (12) and the second center of gravity (C2) of the cylinder (71) coincides with the vertical direction (direction of gravity). In this embodiment, the first straight line (L1) and the second straight line (L2) are offset by a first angle (θ1), so when the casing (21) collides with the ground (G), the side of the bottom plate (23) (right side (23a)) is tilted with respect to the ground (G). Therefore, deformation of the bottom plate (23) and the right plate (24) can be promoted before the compressor (12) collides with the cylinder (71). As a result, the kinetic energy of the compressor (12) can be absorbed by the deformation of the casing (21), so the impact acting from the compressor (12) on the cylinder (71) can be reduced.

[0080] (5) Effects of the embodiment (5-1) In this embodiment, the first straight line (L1) is defined as a straight line passing through the center of gravity of the compressor (12) and the center of gravity of the cylinder (71) in a top view of the base plate (23) from above. The second straight line (L2) is defined as a straight line perpendicular to the side edge of the base plate (23) (the right edge (23a) in this example) and passing through the center of gravity of the compressor (12) in a top view. The first straight line (L1) is shifted by a predetermined first angle (θ1) relative to the second straight line (L2).

[0081] As shown in Figure 8, when the right-hand side (23a) of the casing (21) collides with the ground (G) while parallel to the ground (G), the impact load acting from the compressor (12) on the cylinder (71) is shifted by a first angle (θ1) with respect to the direction of gravity. Therefore, the impact load can be reduced, and damage to the cylinder (71) can be suppressed.

[0082] As shown in Figure 9, when the casing (21) collides with the ground (G) while the first straight line (L1) coincides with the direction of gravity, deformation of the bottom plate (23) and the right plate (24) can be promoted. Therefore, the operating energy of the compressor (12) can be absorbed by the deformation of the casing (21), and damage to the cylinder (71) can be suppressed.

[0083] (5-2) The heat source device (1) further comprises 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. The cylinder (71) is not supported by the support plate (51) but is fixed on the bottom plate (23).

[0084] In this configuration, the elastic support (52) absorbs vibrations of the compressor (12), thereby reducing vibrations during operation of the compressor (12).

[0085] The compressor (12) is fixed to the bottom plate (23) via an elastic support (52), while the cylinder (71) is fixed to the bottom plate (23) without the elastic support (52). Therefore, when the casing (21) falls, the acceleration of the compressor (12) in the direction of gravity is smaller than the acceleration of the cylinder (71) in the direction of gravity. In addition, when the compressor (12) collides with the cylinder (71), the compressor (12) moves upward together with the elastic support (52). As a result, the impact load when the compressor (12) collides with the cylinder (71) can be reduced.

[0086] (5-3) The heat source device further includes a sound-insulating member (60) surrounding the compressor (12). This reduces the operating noise of the compressor (12).

[0087] When the casing (21) falls, the sound-insulating member (60) is positioned between the cylinder (71) and the ground (G). Therefore, the sound-insulating member (60) can reduce the impact when the cylinder (71) indirectly hits the ground (G).

[0088] (5-4) Since the first straight line (L1) is offset by an angle (θ1) toward the first side (26) with respect to the second straight line (L2), the impact acting on the cylinder (71) can be reduced. As the cylinder (71) is closer to the access port (A), the worker can more easily access the cylinder (71), specifically the control valve (73), through the access port (A). As a result, the worker can easily perform the refrigerant charging work.

[0089] (5-5) The casing (21) houses the entire refrigerant circuit (11). In other words, the refrigerant circuit (11) is formed as a closed circuit inside the casing (21). Therefore, compared to, for example, a separate-type refrigeration cycle system, the amount of refrigerant required to fill the refrigerant circuit (11) is reduced, allowing the cylinder (71) to be made smaller. As a result, the rigidity of the cylinder (71) can be increased, and damage to the cylinder (71) can be suppressed.

[0090] (6) Variant The above embodiment may also be configured in the following modified form. The differences from the above embodiment will be explained below.

[0091] (6-1) Torture 1 As schematically shown in Figure 10, the vibration isolation mechanism (50) of Modification 1 and the vibration isolation mechanism (50) of the embodiment have different configurations. In the vibration isolation mechanism (50) of Modification 1, the support plate (51) supports the compressor (12) and the cylinder (71) from below. The compressor (12) and the cylinder (71) are not fixed on the bottom plate (23). Multiple elastic support parts (52) are fixed on the bottom plate (23) and support the support plate (51) from below. In this example, the support plate (51) is formed in the shape of a rectangular plate. Each elastic support part (52) is arranged one at each corner of the support plate (51).

[0092] In this example, in the first direction, the elastic support portion (52) is located on the side (right side (23a)) of the bottom plate (23) relative to the position of the cylinder (71). More specifically, in a top view when the casing (21) is installed, the elastic support portion (52) is positioned between the cylinder (71) and the front corner of the bottom plate (23). It is preferable that the elastic support portion (52) is located on the second straight line (L2) in a top view when the casing (21) is installed.

[0093] In Modification 1, when the casing (21) falls from the right-hand side (23a), the bottom plate (23) and support plate (51) deform before the cylinder (71) hits the ground (G). As a result, the kinetic energy of the compressor (12) can be absorbed, and the impact on the cylinder (71) can be reduced.

[0094] (6-2) Modification 2 As schematically shown in Figure 11, in Modification 2, a buffer member (80) is placed between the compressor (12) and the cylinder (71). In Modification 2, the sound insulation member (60) houses the compressor (12) but does not house the cylinder (71). In other words, the cylinder (71) is located outside the sound insulation member (60). The right wall (62) of the sound insulation member (60) constitutes the buffer member (80) between the compressor (12) and the cylinder (71).

[0095] In the modified example 2, when the casing (21) falls from the right-hand side (23a), the cushioning member (80) (sound-insulating member) mitigates the impact on the cylinder (71) as the compressor (12) moves in the direction of gravity. This prevents damage to the cylinder (71).

[0096] The buffer member (80) placed between the compressor (12) and the cylinder (71) does not have to be a sound-insulating member (60), but may be, for example, a sound-absorbing material. The buffer member (80) may also be an element of the refrigerant circuit (11), such as a water heat exchanger (15) or refrigerant piping.

[0097] (6-3) Modification example 3 As shown in Figure 12, in Modification 3, a sound-absorbing material (90) is provided inside the sound-insulating member (60). The sound-absorbing material (90) is a resin material having open cells, and is made of, for example, urethane. The sound-absorbing material (90) is formed inside the top wall (61), right wall (62), left wall (63), front wall (64), and rear wall (65) of the sound-insulating member (60). The noise reduction effect is improved by using the sound-absorbing material (90). When the casing (21) falls, the sound-absorbing material (90) mitigates the impact when the cylinder (71) hits the ground (G). The sound-absorbing material (90) may be provided on the outside of the sound-insulating member (60) instead of the inside, or it may be provided on both the inside and outside of the sound-insulating member (60).

[0098] (6-4) Modification 4 Modification 4 differs from the embodiment described above in the relationship between the first line (L1) and the second line (L2). In Modification 4, the first position (P1) is closer to the third position (P3) than to the second position (P2). In other words, the distance between the first position (P1) and the third position (P3) is shorter than the distance between the first position (P1) and the second position (P2).

[0099] As shown in Figure 13, the first position (P1) is the intersection of the first line (L1) and the right side (23a) in a top view of the base plate (23) from above. The second position (P2) is the intersection of the second line (L2) and the right side (23a) in a top view. The third position (P3) is the end of the right side (23a) in a top view. Specifically, in this example, the third position (P3) corresponds to the position of the first end (E1), which is the front end of the right side (23a).

[0100] In variation 4, the first position (P1) is closer to the third position (P3) than to the second position (P2). In other words, the first line (L1) is located closer to the end of the right-hand side (23a) (the first end (E1)) relative to the second line (L2).

[0101] In Modification 4, when the right-hand side (23a) of the casing (21) collides with the ground (G) while parallel to the ground (G), the impact load acting from the compressor (12) to the cylinder (71) becomes even smaller. This is because the deviation of the first angle (θ1) of the impact load vector relative to the direction of gravity becomes even larger. Therefore, the impact load can be reduced, and damage to the cylinder (71) can be suppressed.

[0102] When the casing (21) collides with the ground (G) while the first straight line (L1) coincides with the direction of gravity, the deformation of the bottom plate (23) becomes even greater. This is because the distance from the center of gravity of the compressor (12) to the first position (P1) increases. Therefore, the operating energy of the compressor (12) can be further absorbed by the deformation of the casing (21), and damage to the cylinder (71) can be suppressed.

[0103] In the modified example 4, as shown in Figure 13, a corner is formed at the end of the side (right side (23a)). However, as shown in Figure 14, an arc portion may be continuous at the end of the side (23a) in a top view. In this case, the continuity between the side (right side) and the arc portion constitutes the end of the side (23a) (first position (P1)).

[0104] (7) Other embodiments The heat source device (1) may constitute a part of the refrigeration cycle device. Specifically, the refrigeration cycle device may be a separate type in which the heat source unit, which is the heat source device (1), and the utilization unit are connected via connecting piping. The refrigeration cycle device may also be an air conditioning system, a transport-type refrigeration system, a stationary-type refrigeration system, etc.

[0105] The side (23a) for defining the first line (L1) and the second line (L2) does not have to be the right side (23a) of the bottom plate (23), but may be the front side (23c), the back side (23d), or the left side (23b). However, it is preferable that the side is the side on the machine room side, formed on the machine room side (S2) rather than the fan room side (S1).

[0106] The end of the side (23a) used to define the third position (P3) may be the second end (E2), or it may be the end of any of the other sides (23b, 23c, 23d).

[0107] The vibration isolation mechanism (50) may include a lower support plate that supports the elastic support portion (52) of the embodiment from below, and a lower elastic support portion that is fixed on the bottom plate (23) and supports the lower support plate from below.

[0108] The sound-insulating member (60) may cover only the compressor (12).

[0109] Although embodiments and modifications have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. Furthermore, elements of the embodiments, modifications, and other embodiments described above may be combined or substituted as appropriate. In addition, the designations "first," "second," "third," etc. in the specification and claims are used to distinguish the phrases to which these designations are given, and do not limit the number or order of such phrases. [Industrial applicability]

[0110] As explained above, this disclosure is useful for heat source devices. [Explanation of Symbols]

[0111] 1 Heat source device 11 Refrigerant Circuit 12 Compressor 15 Water heat exchanger 21 Casing 23 Bottom plate 23a Right-hand side (side) 24 Right plate (2nd side) 26 Front panel (first side) 51 Support plate 52 Elastic support section 60 Sound insulation material 71 cylinders 80 Cushioning material 90 Sound-absorbing material Access point A L1 1st straight line L2 2nd straight line P1 1st position P2 2nd position P3 3rd position θ1 1st angle

Claims

1. A compressor (12) is included in the refrigerant circuit (11) that performs the refrigeration cycle, A cylinder (71) that stores flammable refrigerant for filling the refrigerant circuit (11) and has an outlet (71a) at its bottom for discharging the flammable refrigerant, The casing (21) comprises the compressor (12) and a bottom plate (23) on which the cylinder (71) is installed. The cylinder (71) is positioned between the compressor (12) and the side (23a) of the bottom plate (23). The first straight line (L1) is defined as a straight line passing through the center of gravity of the compressor (12) and the center of gravity of the cylinder (71) in a top view of the bottom plate (23). The second straight line (L2) is defined as a straight line that, in the top view, is perpendicular to the side edge (23a) of the bottom plate (23) and passes through the center of gravity of the compressor (12). The first line (L1) and the second line (L2) form a predetermined angle (θ1). Heat source device.

2. A support plate (51) supports the compressor (12) from below, The system further includes an elastic support part (52) fixed on the base plate (23) and supporting the support plate (51) from below, The cylinder (71) is not supported by the support plate (51) but is fixed on the bottom plate (23). The heat source device according to claim 1.

3. A support plate (51) supports the compressor (12) and the cylinder (71) from below, The system further includes an elastic support portion (52) fixed on the base plate (23) and supporting the support plate (51) from below. The heat source device according to claim 1.

4. The system further comprises a buffer member (80) positioned between the compressor (12) and the cylinder (71). The heat source device according to claim 1.

5. The buffer member (80) is an element of the refrigerant circuit (11). The heat source device according to claim 4.

6. The aforementioned component includes a water heat exchanger (15) or refrigerant piping. The heat source device according to claim 5.

7. The compressor (12) is further provided with a sound-insulating member (60) surrounding it. A heat source device according to any one of claims 1 to 6.

8. The cylinder (71) is positioned outside the sound insulation member (60). The heat source device according to claim 7.

9. The casing (21) is further provided with sound-absorbing material (90) arranged to overlap the outer or inner surface. A heat source device according to any one of claims 1 to 6.

10. The first position (P1) is defined as the position of the intersection of the first straight line (L1) and the side edge (23a) in the top view. The second position (P2) is defined as the position of the intersection of the second line (L2) and the side edge (23a) in the top view. The third position (P3) is defined as the position of the end (E1) of the side edge (23a) in the top view, The distance between the first position (P1) and the third position (P3) is shorter than the distance between the first position (P1) and the second position (P2). A heat source device according to any one of claims 1 to 6.

11. The casing (21) is A first side (26) having an access port (A), The bottom plate (23) has a second side surface (24) that corresponds to the side edge (23a), The first straight line (L1) is offset from the second straight line (L2) by a predetermined angle (θ1) toward the first side surface (26). A heat source device according to any one of claims 1 to 6.

12. The casing (21) houses the entire refrigerant circuit (11). A heat source device according to any one of claims 1 to 6.

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