Heat source unit and refrigeration cycle device

Abstract

A compressor (30), an accumulator (25), and a sound insulation member (60) are disposed in an internal space (S1) of a casing (70). The sound insulation member (60) covers the compressor (30) and the accumulator (25) so as to define an accommodation space (65) for accommodating the compressor (30) and the accumulator (25). A gap is provided between the outer surface of the sound insulation member (60) and the inner surface of the casing (70). The length of the gap is 5-210 mm.

Description

Heat source unit and refrigeration cycle device

[0001] The present disclosure relates to a heat source unit and a refrigeration cycle device.

[0002] Patent Document 1 discloses a heat source unit (outdoor unit) in which a compressor soundproof box containing a compressor is arranged in a machine room. In the invention of Patent Document 1, sound-absorbing material is attached to the inner surfaces of sound-insulating members (sound-insulating box metal sheet) that form the side and top surfaces of the compressor soundproof box.

[0003] Patent No. 6501908

[0004] In the heat source unit, in addition to the noise generated by the compressor, for example, radiation noise and vibration noise from the accumulator may leak to the outside.

[0005] In response to the recent stricter noise regulation standards, the inventors have investigated new structures to further enhance the soundproofing effect of heat source units. They have also investigated the appropriate positional relationship between the casing of the heat source unit and the sound-insulating member.

[0006] An object of the present disclosure is to suppress radiated noise and vibration noise from a compressor and an accumulator from leaking to the outside.

[0007] A first aspect of the present disclosure includes a casing (70), a compressor (30) that is disposed in an internal space (S1) of the casing (70) and compresses a refrigerant, an accumulator (25) that is disposed in the internal space (S1) and connected to the compressor (30), and a sound insulation member (60) that is disposed in the internal space (S1) and covers the compressor (30) and the accumulator (25) so as to define an accommodation space (65) that accommodates the compressor (30) and the accumulator (25), wherein a gap is provided between an outer surface of the sound insulation member (60) and an inner surface of the casing (70), and the length of the gap, which is the shortest distance between the outer surface of the sound insulation member (60) and the inner surface of the casing (70) facing the outer surface of the sound insulation member (60), is 5 mm or more and 210 mm or less.

[0008] In the first aspect, the double sound insulation structure of the sound insulation member (60) and the casing (70) can prevent radiated sound and vibration sound from the compressor (30) and the accumulator (25) from leaking to the outside. In addition, by appropriately setting the length of the gap, it is possible to prevent contact between the sound insulation member (60) and the casing (70) due to vibration and to enhance the soundproofing effect.

[0009] A second aspect of the present disclosure is the heat source unit of the first aspect, wherein a plurality of the gaps are provided along the periphery of the sound-insulating member (60), and the length of at least one of the plurality of gaps is 5 mm or more and 50 mm or less.

[0010] In the second aspect, by appropriately setting the length of the gap, it is possible to prevent the sound insulating member (60) from coming into contact with the casing (70) due to vibration, and to enhance the soundproofing effect.

[0011] A third aspect of the present disclosure is a heat source unit according to the first or second aspect, wherein a part of the casing (70) has a first wall portion (81) that is detachable from the casing (70), and a part of the sound-insulating member (60) has a second wall portion (82) that is detachable from the sound-insulating member (60) at a position corresponding to the first wall portion (81) of the casing (70).

[0012] In the third aspect, the double sound insulation structure of the sound insulation member (60) and the casing (70) can prevent radiated sound and vibration sound from the compressor (30) from leaking to the outside. Furthermore, by removing the first wall portion (81) of the casing (70) and the second wall portion (82) of the sound insulation member (60), the inside of the accommodation space (65) of the sound insulation member (60) can be easily accessed, improving maintainability.

[0013] A fourth aspect of the present disclosure is a heat source unit according to the third aspect, wherein the first wall portion (81) includes an upper wall portion of the casing (70), and the second wall portion (82) includes an upper wall portion of the sound-insulating member (60).

[0014] In the fourth aspect, the first wall (81) and the second wall (82) can be removed from the top side, thereby making it possible to access the accommodation space (65) of the sound insulating member (60) from the top side.

[0015] A fifth aspect of the present disclosure is a heat source unit of the third or fourth aspect, wherein a blower chamber (S2) is provided inside the casing (70), and a fan (22) is arranged in the blower chamber (S2), the air flow direction of the fan (22) is defined as a first direction, the first wall portion (81) includes a wall portion of the casing (70) on the first direction side, and the second wall portion (82) includes a wall portion of the sound-insulating member (60) on the first direction side.

[0016] In the fifth aspect, the first wall portion (81) and the second wall portion (82) can be removed from the first direction side, thereby making it possible to access the accommodation space (65) of the sound insulating member (60) from the first direction side.

[0017] A sixth aspect of the present disclosure is a heat source unit according to any one of the third to fifth aspects, wherein a blower chamber (S2) is provided inside the casing (70), and a fan (22) is arranged in the blower chamber (S2), the air flow direction of the fan (22) is defined as a first direction, and a direction perpendicular to the first direction and the vertical direction is defined as a second direction, the first wall portion (81) includes a wall portion of the casing (70) on the second direction side, and the second wall portion (82) includes a wall portion of the sound-insulating member (60) on the second direction side.

[0018] In the sixth aspect, the first wall portion (81) and the second wall portion (82) can be removed from the second direction side, thereby making it possible to access the accommodation space (65) of the sound insulating member (60) from the second direction side.

[0019] A seventh aspect of the present disclosure is a heat source unit according to any one of the third to sixth aspects, further comprising a first sound-absorbing material (61) provided between the outer surface of the sound-insulating member (60) and the inner surface of the casing (70).

[0020] In the seventh aspect, the first sound-absorbing material (61) can suppress a decrease in sound insulation performance due to the low-frequency resonance transmission phenomenon, thereby improving the soundproofing effect.

[0021] An eighth aspect of the present disclosure is the heat source unit of any one of the third to seventh aspects, further comprising a second sound absorbing material (62) provided on an inner surface of the sound insulating member (60).

[0022] In the eighth aspect, the second sound-absorbing material (62) absorbs the radiated sound and vibration sound from the compressor (30), thereby improving the soundproofing effect.

[0023] A ninth aspect of the present disclosure is the heat source unit of the eighth aspect, further comprising a first sound-absorbing material (61) provided between the outer surface of the sound-insulating member (60) and the inner surface of the casing (70).

[0024] In the ninth aspect, the first sound-absorbing material (61) can suppress a decrease in sound insulation performance due to the low-frequency resonance transmission phenomenon, thereby improving the soundproofing effect.

[0025] A tenth aspect of the present disclosure is the heat source unit of the seventh aspect, wherein the first sound absorbing material (61) is attached to an inner surface of the first wall portion (81) of the casing (70).

[0026] In the tenth aspect, the first sound absorbing material (61) can be removed together with the first wall portion (81) of the casing (70).

[0027] An eleventh aspect of the present disclosure is the heat source unit of the eighth aspect, wherein the second sound absorbing material (62) is attached to an inner surface of the second wall portion (82) of the sound insulating member (60).

[0028] In the eleventh aspect, the second sound absorbing material (62) can be removed together with the second wall portion (82) of the sound insulating member (60).

[0029] A twelfth aspect of the present disclosure is the heat source unit of the ninth aspect, wherein the first sound-absorbing material (61) is attached to the inner surface of the first wall portion (81) of the casing (70), and the second sound-absorbing material (62) is attached to the inner surface of the second wall portion (82) of the sound-insulating member (60).

[0030] In the twelfth aspect, the first sound-absorbing material (61) can be removed together with the first wall (81) of the casing (70). Furthermore, the second sound-absorbing material (62) can be removed together with the second wall (82) of the sound-insulating member (60).

[0031] A thirteenth aspect of the present disclosure is a heat source unit according to any one of the first to twelfth aspects, comprising a first vibration-isolating member (41) that supports the compressor (30), a first support member (51) that supports the first vibration-isolating member (41), a second vibration-isolating member (42) that supports the first support member (51), and a second support member (52) that supports the second vibration-isolating member (42).

[0032] In the thirteenth aspect, the compressor (30) is supported by a two-layer vibration-proof structure in which a first vibration-proof member (41) and a second vibration-proof member (42) are stacked, thereby making it possible to attenuate vibrations of the compressor (30).

[0033] A fourteenth aspect of the present disclosure is a refrigeration cycle apparatus including the heat source unit (20) according to any one of the first to thirteenth aspects.

[0034] In the fourteenth aspect, a refrigeration cycle apparatus including a heat source unit (20) can be provided.

[0035] FIG. 1 is a refrigerant circuit diagram of a refrigeration cycle device of the first embodiment. FIG. 2 is a front cross-sectional view showing the configuration of a heat source unit. FIG. 3 is a plan cross-sectional view showing the configuration of a heat source unit. FIG. 4 is a graph showing the relationship between ⅓ octave band center frequency and transmission loss. FIG. 5 is a front cross-sectional view showing the configuration of a heat source unit of the second embodiment. FIG. 6 is a plan cross-sectional view showing the configuration of a heat source unit. FIG. 7 is a front cross-sectional view showing the configuration of a heat source unit of the third embodiment. FIG. 8 is a front cross-sectional view showing the configuration of a heat source unit of the fourth embodiment. FIG. 9 is a plan cross-sectional view showing the configuration of a heat source unit. FIG. 10 is a front cross-sectional view showing the configuration of a heat source unit of the fifth embodiment. FIG. 11 is a plan cross-sectional view showing the configuration of a heat source unit. FIG. 12 is a front cross-sectional view showing a state in which the first wall portion and the second wall portion on the upper surface side have been removed. FIG. 13 is a view seen from the arrow A in FIG. 12. FIG. 14 is a plan cross-sectional view showing a state in which the first wall portion and the second wall portion on the front surface side and the first wall portion and the second wall portion on the right surface side have been removed. Fig. 15 is a view seen from the direction of arrow B in Fig. 14. Fig. 16 is a view seen from the direction of arrow C in Fig. 14. Fig. 17 is a front cross-sectional view showing the configuration of the heat source unit of this embodiment 6. Fig. 18 is a plan cross-sectional view showing the configuration of the heat source unit. Fig. 19 is a front cross-sectional view showing a state in which the first wall portion and the second wall portion on the upper surface side have been removed. Fig. 20 is a plan cross-sectional view showing a state in which the first wall portion and the second wall portion on the front surface side and the first wall portion and the second wall portion on the right surface side have been removed. Fig. 21 is a front cross-sectional view showing the configuration of the heat source unit of this embodiment 7. Fig. 22 is a plan cross-sectional view showing the configuration of the heat source unit.

[0036] First Embodiment As shown in FIG. 1 , a refrigeration cycle apparatus (1) is a refrigeration cycle apparatus for supplying hot water, having an outdoor unit (20) as a heat source unit. The outdoor unit (20) has a refrigerant circuit (2). The refrigerant circuit (2) is filled with, for example, a flammable natural refrigerant. The flammable natural refrigerant is, for example, propane. Propane is a refrigerant with a higher specific gravity than air. The refrigerant circuit (2) performs a refrigeration cycle by circulating the refrigerant.

[0037] <Fluid Circuit> The refrigeration cycle device (1) has a fluid circuit (12). Water flows through the fluid circuit (12) as a heat medium. A water heat exchanger (15) and a fluid pump (16) are connected to the fluid circuit (12). The fluid pump (16) circulates the water in the fluid circuit (12). The fluid heated by the water heat exchanger (15) is supplied to a hot water supply tank, which is the supply destination. The water in the hot water supply tank returns to the fluid circuit (12) and is heated again by the water heat exchanger (15).

[0038] <Outdoor Unit> The outdoor unit (20) includes a refrigerant cylinder (5), a water heat exchanger (15), an outdoor heat exchanger (21), an outdoor fan (22), an outdoor expansion valve (23), a four-way switching valve (24), an accumulator (25), and a compressor (30). The outdoor heat exchanger (21), the outdoor expansion valve (23), the four-way switching valve (24), and the compressor (30) are connected by a pipe (26).

[0039] The refrigerant cylinder (5) is filled with refrigerant. The refrigerant cylinder (5) is connected, for example, to a pipe branching off from a pipe (26) connecting the four-way selector valve (24) and the accumulator (25). After the outdoor unit (20) is transported to the installation site, the refrigerant cylinder (5) opens the on-off valve (6) of the refrigerant cylinder (5) to fill the refrigerant circuit (2) with refrigerant. This arrangement can prevent flammable refrigerant from leaking from the refrigerant circuit (2) during transportation of the outdoor unit (20).

[0040] The water heat exchanger (15) is connected to a pipe (26) of the refrigerant circuit (2). The water heat exchanger (15) exchanges heat between the refrigerant flowing through the pipe (26) and the water flowing through a fluid pipe (17) of the fluid circuit (12).

[0041] The outdoor heat exchanger (21) is, for example, a cross-fin type fin-and-tube heat exchanger. Specifically, the outdoor heat exchanger (21) is, for example, a so-called plug-in fin type microchannel heat exchanger. In the outdoor heat exchanger (21), heat is exchanged between the refrigerant flowing through the outdoor heat exchanger (21) and the air blown by the outdoor fan (22). The outdoor expansion valve (23) is, for example, an electronic expansion valve. The outdoor heat exchanger (21) is an example of a heat source side heat exchanger.

[0042] The four-way switching valve (24) has a first port (P1), a second port (P2), a third port (P3), and a fourth port (P4). The four-way switching valve (24) is in a state where the first port (P1) communicates with the third port (P3) and where the second port (P2) communicates with the fourth port (P4) (the state shown by the solid lines in FIG. 1).

[0043] The compressor (30) compresses the refrigerant. The compressor (30) is, for example, a rotary compressor such as a scroll compressor. A four-way switching valve (24) is connected to a pipe (26) on the discharge side of the compressor (30). An accumulator (25) is connected to a pipe (26) on the suction side of the compressor (30).

[0044] <Internal Configuration of Outdoor Unit> In the following description, arrows are used in each drawing to indicate up / down, front / rear, left / right directions. Unless otherwise specified, the up / down directions will be described according to the directions indicated by these arrows.

[0045] As shown in Figures 2 and 3, the outdoor unit (20) has a casing (70). The casing (70) is formed in a box shape. The casing (70) is made of, for example, a metal plate. The casing (70) has an upper panel (71), a bottom panel (72), a front panel (73), a rear panel (74), a left panel (75), and a right panel (76).

[0046] A partition member (28) is disposed upright inside the casing (70). The partition member (28) is formed, for example, from a metal plate. The partition member (28) divides the interior of the casing (70) into a machine chamber (S1) and a fan chamber (S2) as internal spaces.

[0047] The blower chamber (S2) is a space inside the casing (70) to the left of the partition member (28) in Fig. 2. The blower chamber (S2) accommodates an outdoor fan (22), a fan motor (22a), and an outdoor heat exchanger (21).

[0048] The casing (70) has an inlet (70a) and an outlet (70b). The inlet (70a) is formed in the rear panel (74) and the left panel (75). The outlet (70b) is formed in the front panel (73). When the outdoor fan (22) is rotated by the fan motor (22a), air drawn into the blower chamber (S2) through the inlet (70a) exchanges heat with refrigerant flowing through the outdoor heat exchanger (21). The air after heat exchange is blown out of the outdoor unit (20) through the outlet (70b). In FIG. 3, the air flow is indicated by white arrows.

[0049] The machinery chamber (S1) is a space inside the casing (70) to the right of the partition member (28) in Fig. 2. The machinery chamber (S1) accommodates a refrigerant cylinder (5), a pipe group (8), a water heat exchanger (15), an accumulator (25), a compressor (30), and a sound insulating member (60).

[0050] The compressor (30) has support legs (31). The support legs (31) are supported by a plurality of first vibration-isolating members (41). The first vibration-isolating members (41) are made of, for example, rubber or urethane. The first vibration-isolating members (41) are supported on the bottom plate (72) of the casing (70). As a result, even if the compressor (30) vibrates during operation of the refrigeration cycle apparatus (1), the vibration is damped by the first vibration-isolating members (41) before being transmitted to the bottom plate (72).

[0051] The refrigerant cylinder (5) and the water heat exchanger (15) are supported on the bottom plate (72) of the casing (70). The accumulator (25) is supported by a stay (not shown) at a position spaced apart from the bottom plate (72) of the casing (70).

[0052] The sound insulating member (60) is formed in a box shape with an opening at the bottom. The sound insulating member (60) is supported on the bottom plate (72) of the casing (70). The sound insulating member (60) is made of an air-impermeable material. The sound insulating member (60) is made of, for example, a metal plate or a rubber sheet.

[0053] The sound-insulating member (60) defines an accommodation space (65) that accommodates the compressor (30) and the accumulator (25). The sound-insulating member (60) covers the compressor (30) and the accumulator (25). The accommodation space (65) of the sound-insulating member (60) accommodates the refrigerant cylinder (5), the pipe group (8), and the water heat exchanger (15) in addition to the compressor (30) and the accumulator (25). The sound-insulating member (60) covers the refrigerant cylinder (5), the pipe group (8), and the water heat exchanger (15).

[0054] The piping group (8) includes a valve element (9) and a pipe (26). The valve element (9) includes an outdoor expansion valve (23), a four-way switching valve (24), and a solenoid valve (29). The piping group (8) may include an internal heat exchanger for exchanging heat between refrigerants, a muffler, a filter, etc. The valve element (9) may include an electric valve, a check valve, a three-way valve, etc.

[0055] <Regarding the double sound insulation structure> A gap is provided between the outer surface of the sound insulation member (60) and the inner surface of the casing (70). The inner surface of the casing (70) includes the surface of the partition member (28) facing the machine room (S1). A plurality of gaps are provided along the periphery of the sound insulation member (60). Specifically, a gap is provided between the outer surfaces of the upper wall, front wall, rear wall, left wall, and right wall of the sound insulation member (60) and the inner surfaces of the upper panel (71), front panel (73), rear panel (74), partition member (28), and right panel (76) of the casing (70), which face each side wall of the sound insulation member (60).

[0056] Hereinafter, the shortest distance between the side wall of the sound insulation member (60) and the panel of the casing (70) facing the side wall of the sound insulation member (60) will be referred to as the gap length L. In this embodiment, the gap length L is set to be not less than 5 mm and not more than 210 mm. It is preferable that the length L of at least one of the gaps be set to be not less than 5 mm and not more than 50 mm.

[0057] Fig. 4 is a graph showing the relationship between the ⅓ octave band center frequency and the transmission loss. Specifically, the mass law is generally followed in the sound insulation of noise. Fig. 4 compares the transmission loss when the casing (70) is made of a steel plate having a thickness of 0.8 mm and when the casing (70) is made of a steel plate having a thickness of 1.6 mm.

[0058] As shown in FIG. 4, the transmission loss is greater with a plate thickness of 1.6 mm than with a plate thickness of 0.8 mm, and it is clear that the sound insulation performance is higher.

[0059] Here, in order to improve sound insulation performance while maintaining the same mass, we considered using two 0.8 mm thick plates to insulate sound rather than one 1.6 mm thick plate.

[0060] In the example shown in Fig. 4, the casing (70) is made of a steel plate having a thickness of 0.8 mm, and the sound insulating member (60) is made of a steel plate having a thickness of 0.8 mm. The transmission loss is compared when the length L of the gap between the outer surface of the sound insulating member (60) and the inner surface of the casing (70) is changed.

[0061] Specifically, the relationship between the ⅓ octave band center frequency and the transmission loss was compared when the length L of the gap between the outer surface of the sound-insulating member (60) and the inner surface of the casing (70) was 5 mm, 10 mm, 25 mm, 50 mm, and 210 mm.

[0062] As shown in Figure 4, it can be seen that sound insulation performance other than for low frequencies is improved when sound is insulated by providing a gap between two plates, i.e., the casing (70) and the sound-insulating member (60), compared to when no sound-insulating member (60) is provided, i.e., when sound is insulated by a single plate.

[0063] Here, in order to prevent the sound insulating member (60) from coming into contact with the casing (70) due to vibration, it is preferable that the length L of the gap is 5 mm or more.

[0064] Furthermore, the transmission loss when the gap length L is in the range of 5 mm to 210 mm is greater than the transmission loss when sound is blocked by a single plate material with a thickness of 1.6 mm in the frequency range of 1000 Hz to 5000 Hz, which is a frequency that people find uncomfortable.

[0065] Furthermore, if the gap length L is set in the range of 5 mm to 50 mm, it is possible to achieve a distance that does not cause a significant decrease due to the coincidence effect in the 2500 Hz band, which has the greatest positive correction (correction that increases noise) in A-weighting, a frequency characteristic that simulates human hearing.This makes it possible to achieve both noise reduction and suppression of discomfort.

[0066] Here, the coincidence effect is a phenomenon in which when sound of a certain frequency is incident on a plate material, resonance occurs, causing a decrease in transmission loss near a specific frequency.

[0067] The A-weighting characteristic is a frequency weighting characteristic specified in "JIS C1509" and used when measuring noise levels.

[0068] Effect of First Embodiment According to the features of the present embodiment, the double sound insulation structure of the sound insulation member (60) and the casing (70) can prevent radiated sound and vibration sound from the compressor (30) and the accumulator (25) from leaking to the outside. Furthermore, by setting the length of the gap to be equal to or greater than 5 mm and equal to or less than 210 mm, contact between the sound insulation member (60) and the casing (70) due to vibration can be prevented, and the soundproofing effect can be improved.

[0069] According to the features of this embodiment, by setting the length of the gap to 5 mm or more and 50 mm or less, it is possible to prevent the soundproofing member (60) from coming into contact with the casing (70) due to vibration and to enhance the soundproofing effect.

[0070] According to the features of the present embodiment, it is possible to provide a refrigeration cycle apparatus (1) including a heat source unit (20).

[0071] Second Embodiment Hereinafter, the same parts as those in the first embodiment will be denoted by the same reference numerals, and only the differences will be described.

[0072] 5 and 6, a first sound absorbing material (61) is provided in the gap between the outer surface of the sound insulating member (60) and the inner surface of the casing (70). The first sound absorbing material (61) is made of, for example, urethane. The first sound absorbing material (61) is arranged on the outer surface of each of the upper wall, front wall, rear wall, left wall, and right wall of the sound insulating member (60).

[0073] Effect of Second Embodiment According to the features of the present embodiment, the first sound-absorbing material (61) can suppress a decrease in sound insulation performance due to the low-frequency resonance transmission phenomenon, thereby improving the soundproofing effect.

[0074] Specifically, when two plates form a double structure with a hollow space between them, the two plates become two masses, and the air in the hollow space acts as a spring connecting them, causing them to vibrate, resulting in a resonance phenomenon. In this case, the transmission loss is lower than the mass law, and sound insulation performance deteriorates. This phenomenon generally occurs in the low frequency range, so it is called the low frequency resonance transmission phenomenon.

[0075] In contrast to this, in this embodiment, a first sound-absorbing material (61) is provided in the gap between the outer surface of the sound-insulating member (60) and the inner surface of the casing (70), thereby suppressing the occurrence of the resonance phenomenon in which the air in the gap between the sound-insulating member (60) and the casing (70) acts as a spring and vibrates.

[0076] Third Embodiment As shown in Fig. 7 , a second sound-absorbing material (62) is provided on the inner surface of the sound-insulating member (60). The second sound-absorbing material (62) is made of, for example, urethane. The second sound-absorbing material (62) is arranged on the inner surface of each of the upper wall, front wall, rear wall, left wall, and right wall of the sound-insulating member (60).

[0077] Effect of Embodiment 3 According to the features of this embodiment, the second sound-absorbing material (62) absorbs radiated sound and vibration sound from the compressor (30) and the accumulator (25), thereby improving the soundproofing effect.

[0078] Specifically, when the compressor (30) and the accumulator (25) as sound sources are enclosed in a sound-insulating member (60) that is a box-shaped member, the sound is reflected by the sound-insulating member (60), causing a phenomenon known as build-up, in which the sound pressure level around the compressor (30) and the accumulator (25) increases compared to when the sound-insulating member (60) is not present.

[0079] As a result, the sound pressure level outside the sound insulating member (60) is equal to the sound pressure level without the sound insulating member (60) minus the transmission loss and build-up of the sound insulating member (60). Therefore, the amount of sound reduction achieved by providing the sound insulating member (60) is smaller than the value expected based on the transmission loss.

[0080] Therefore, in this embodiment, a second sound absorbing material (62) is provided on the inner surface of the sound insulating member (60) to attenuate the sound pressure level inside the sound insulating member (60), thereby making it possible to suppress buildup.

[0081] Fourth Embodiment As shown in Figures 8 and 9, the compressor (30) has support legs (31). The support legs (31) are supported by a plurality of first vibration-isolating members (41). The first vibration-isolating members (41) are supported by a first support member (51). The first support member (51) is supported by a plurality of second vibration-isolating members (42). The second vibration-isolating members (42) are supported by a second support member (52). In the example shown in Figure 8, the second support member (52) is a bottom plate (72) of the casing (70).

[0082] The first vibration-isolating member (41) and the second vibration-isolating member (42) are made of rubber or urethane. The material and spring constant of the first vibration-isolating member (41) and the material and spring constant of the second vibration-isolating member (42) may be the same as or different from each other.

[0083] The compressor (30) is disposed on a double vibration-isolating structure including a first vibration-isolating member (41), a first support member (51), and a second vibration-isolating member (42). Therefore, even if the compressor (30) vibrates during operation of the refrigeration cycle apparatus (1), transmission of the vibration and generation of noise are suppressed.

[0084] The refrigerant cylinder (5) and the water heat exchanger (15) are supported by a first support member (51). The accumulator (25) is supported by a stay (not shown) at a position spaced apart from the bottom plate (72) of the casing (70).

[0085] The sound insulating member (60) is supported on the bottom plate (72) of the casing (70). The sound insulating member (60) accommodates the compressor (30), the accumulator (25), the refrigerant cylinder (5), the piping (8), and the water heat exchanger (15) in the accommodation space (65). The sound insulating member (60) covers the compressor (30), the accumulator (25), the refrigerant cylinder (5), the piping (8), and the water heat exchanger (15).

[0086] A gap is provided between the outer surface of the sound insulating member (60) and the inner surface of the casing (70). A first sound absorbing material (61) is provided in the gap between the outer surface of the sound insulating member (60) and the inner surface of the casing (70). A second sound absorbing material (62) is provided on the inner surface of the sound insulating member (60).

[0087] -Effects of embodiment 4- According to the features of this embodiment, the compressor (30) is supported by a two-layer vibration-proof structure in which a first vibration-proof member (41) and a second vibration-proof member (42) are stacked, thereby making it possible to damp vibrations of the compressor (30).

[0088] This reduces vibrations transmitted from the compressor (30) to the first support member (51) and the second support member (52) and vibrations transmitted from the compressor (30) to the piping (26), thereby suppressing the generation of vibration noise caused by vibrations of the first support member (51) and the second support member (52) and the piping (26).

[0089] 10 and 11 , a gap is provided between the outer surface of the sound insulation member (60) and the inner surface of the casing (70). The inner surface of the casing (70) includes the surface of the partition member (28) facing the machine chamber (S1). A gap is provided between the outer surfaces of the upper wall (85), front wall (86), rear wall (87), left wall (88), and right wall (89) of the sound insulation member (60) and the inner surfaces of the upper panel (71), front panel (73), rear panel (74), partition member (28), and right panel (76) of the casing (70), which face the respective side walls of the sound insulation member (60).

[0090] The upper wall (85) faces the upper panel (71) and forms the upper surface of the sound insulation member (60). The front wall (86) faces the front panel (73) and forms the front surface of the sound insulation member (60). The rear wall (87) faces the rear panel (74) and forms the rear surface of the sound insulation member (60). The left wall (88) faces the partition member (28) and forms the left surface of the sound insulation member (60). The right wall (89) faces the right panel (76) and forms the right surface of the sound insulation member (60).

[0091] A part of the casing (70) has a first wall (81). The first wall (81) is detachable from the casing (70). Here, the direction of air flow caused by the outdoor fan (22) is referred to as a first direction (front-rear direction in FIG. 11 ), and the direction perpendicular to the first direction and the up-down direction is referred to as a second direction (left-right direction in FIG. 11 ).

[0092] The first wall portion (81) includes a wall portion on the upper surface side of the casing (70), a wall portion on the first direction side, and a wall portion on the second direction side. In the example shown in Figures 10 and 11, the first wall portion (81) is provided on each of the upper panel (71), the front panel (73), and the right panel (76). In the example shown in Figure 10, the entire upper panel (71) forms the first wall portion (81) on the upper surface side of the casing (70).

[0093] The first wall portion (81) is attached to each panel of the casing (70) with bolts or the like (not shown). When the first wall portion (81) is removed from the casing (70), a first maintenance opening (91) is exposed in the casing (70).

[0094] A part of the sound insulating member (60) has a second wall portion (82). The second wall portion (82) is detachable from the sound insulating member (60) at a position corresponding to the first wall portion (81) of the casing (70).

[0095] The second wall portion (82) includes a wall portion on the upper surface side, a wall portion on the first direction side, and a wall portion on the second direction side of the sound insulating member (60). In the example shown in Figures 10 and 11, the second wall portion (82) is provided on each of the upper wall (85), the front wall (86), and the right side wall (89).

[0096] The second wall portion (82) is attached to each side wall of the sound insulation member (60) by bolts or the like (not shown). When the second wall portion (82) is removed from the sound insulation member (60), a second maintenance opening (92) is opened in the sound insulation member (60).

[0097] As shown in Figure 12, by removing the first wall portion (81) on the upper surface side of the casing (70) and the second wall portion (82) on the upper surface side of the sound-insulating member (60), it is possible to access the storage space (65) of the sound-insulating member (60) from the upper surface side.

[0098] As shown in Figure 13, the pipe group (8) can be seen through the second maintenance opening (92) on the upper surface side of the sound insulating member (60), thereby making it possible to perform maintenance on the pipe group (8).

[0099] 14 , by removing the first wall portion (81) on the front side of the casing (70) and the second wall portion (82) on the front side of the sound insulation member (60), the storage space (65) of the sound insulation member (60) can be accessed from the front side. Also, by removing the first wall portion (81) on the right side of the casing (70) and the second wall portion (82) on the right side of the sound insulation member (60), the storage space (65) of the sound insulation member (60) can be accessed from the right side.

[0100] 15, the compressor (30) and the refrigerant cylinder (5) can be seen through the second maintenance opening (92) on the front side of the sound insulation member (60), which allows maintenance of the compressor (30) and refrigerant filling work using the refrigerant cylinder (5) to be performed.

[0101] As shown in Figure 16, the water heat exchanger (15) can be seen through the second maintenance opening (92) on the right side of the sound insulation member (60), thereby enabling maintenance of the water heat exchanger (15).

[0102] Effect of the Fifth Embodiment In a heat source unit, a panel of the housing may need to be removed to perform maintenance inside the machinery compartment. If the compressor is covered with a soundproofing material, access to the compressor requires removing the soundproofing material from the machinery compartment, which presents a problem of poor maintainability. In contrast, the present embodiment provides easy access to the space housing the soundproofing material.

[0103] According to the features of this embodiment, the double sound insulation structure of the sound insulation member (60) and the casing (70) can prevent radiated sound and vibration sound from the compressor (30) from leaking to the outside. In addition, by removing the first wall portion (81) of the casing (70) and the second wall portion (82) of the sound insulation member (60), the inside of the accommodation space (65) of the sound insulation member (60) can be easily accessed, improving maintainability.

[0104] According to the feature of this embodiment, the first wall (81) and the second wall (82) can be removed from the top side, thereby making it possible to access the accommodation space (65) of the sound insulating member (60) from the top side.

[0105] According to the features of this embodiment, by removing the first wall portion (81) and the second wall portion (82) from the first direction side, it is possible to access the storage space (65) of the sound-insulating member (60) from the first direction side.

[0106] According to the feature of this embodiment, by removing the first wall portion (81) and the second wall portion (82) from the second direction side, it is possible to access the storage space (65) of the sound-insulating member (60) from the second direction side.

[0107] According to the features of the present embodiment, it is possible to provide a refrigeration cycle apparatus (1) including a heat source unit (20).

[0108] Sixth Embodiment Hereinafter, the same parts as those in the first embodiment will be denoted by the same reference numerals, and only the differences will be described.

[0109] 17 and 18 , a first sound-absorbing material (61) is provided in the gap between the outer surface of the sound-insulating member (60) and the inner surface of the casing (70). The first sound-absorbing material (61) is made of, for example, urethane. The first sound-absorbing material (61) is arranged on the outer surface of each of the upper wall (85), the front wall (86), the rear wall (87), the left wall (88), and the right wall (89) of the sound-insulating member (60).

[0110] A second sound absorbing material (62) is provided on the inner surface of the sound insulating member (60). The second sound absorbing material (62) is made of, for example, urethane. The second sound absorbing material (62) is arranged on the inner surface of each of the upper wall (85), the front wall (86), the rear wall (87), the left wall (88), and the right wall (89) of the sound insulating member (60).

[0111] 19 and 20, a part of the casing (70) has a first wall portion (81). The first wall portion (81) is detachable from the casing (70). The first wall portion (81) is provided on each of the upper panel (71), the front panel (73), and the right panel (76).

[0112] The first sound absorbing material (61) is attached to the inner surface of the first wall portion (81) of the casing (70). When the first wall portion (81) is removed from the casing (70), the first sound absorbing material (61) is removed together with the first wall portion (81), and a first maintenance opening (91) is opened in the casing (70).

[0113] A part of the sound insulating member (60) has a second wall portion (82). The second wall portion (82) is detachable from the sound insulating member (60) at a position corresponding to the first wall portion (81) of the casing (70). The second wall portion (82) is provided on each of the upper wall (85), the front wall (86), and the right side wall (89).

[0114] The second sound absorbing material (62) is attached to the inner surface of the second wall portion (82) of the sound insulating member (60). When the second wall portion (82) is removed from the sound insulating member (60), the second sound absorbing material (62) is removed together with the second wall portion (82), and a second maintenance opening (92) is opened in the sound insulating member (60).

[0115] Effect of Sixth Embodiment According to the features of this embodiment, the first sound-absorbing material (61) can suppress a decrease in sound insulation performance due to the low-frequency resonance transmission phenomenon, thereby improving the soundproofing effect.

[0116] Specifically, when two plates form a double structure with a hollow space between them, the two plates become two masses, and the air in the hollow space acts as a spring connecting them, causing them to vibrate, resulting in a resonance phenomenon. In this case, the transmission loss is lower than the mass law, and sound insulation performance deteriorates. This phenomenon generally occurs in the low frequency range, so it is called the low frequency resonance transmission phenomenon.

[0117] In contrast to this, in this embodiment, a first sound-absorbing material (61) is provided in the gap between the outer surface of the sound-insulating member (60) and the inner surface of the casing (70), thereby suppressing the occurrence of the resonance phenomenon in which the air in the gap between the sound-insulating member (60) and the casing (70) acts as a spring and vibrates.

[0118] According to the feature of this embodiment, the second sound-absorbing material (62) absorbs the radiated sound and vibration sound from the compressor (30) and the accumulator (25), thereby improving the soundproofing effect.

[0119] Specifically, when the compressor (30) and the accumulator (25) as sound sources are enclosed in a sound-insulating member (60) that is a box-shaped member, the sound is reflected by the sound-insulating member (60), causing a phenomenon known as build-up, in which the sound pressure level around the compressor (30) and the accumulator (25) increases compared to when the sound-insulating member (60) is not present.

[0120] As a result, the sound pressure level outside the sound insulating member (60) is equal to the sound pressure level without the sound insulating member (60) minus the transmission loss and build-up of the sound insulating member (60). Therefore, the amount of sound reduction achieved by providing the sound insulating member (60) is smaller than the value expected based on the transmission loss.

[0121] Therefore, in this embodiment, a second sound absorbing material (62) is provided on the inner surface of the sound insulating member (60) to attenuate the sound pressure level inside the sound insulating member (60), thereby making it possible to suppress buildup.

[0122] According to the feature of this embodiment, the first sound absorbing material (61) can be removed together with the first wall portion (81) of the casing (70).

[0123] According to the feature of this embodiment, the second sound absorbing material (62) can be removed together with the second wall portion (82) of the sound insulating member (60).

[0124] Seventh Embodiment As shown in Figures 21 and 22 , the compressor (30) has support legs (31). The support legs (31) are supported by a plurality of first vibration-isolating members (41). The first vibration-isolating members (41) are supported by a first support member (51). The first support member (51) is supported by a plurality of second vibration-isolating members (42). The second vibration-isolating members (42) are supported by a second support member (52). In the example shown in Figure 21 , the second support member (52) is a bottom plate (72) of the casing (70).

[0125] The first vibration-isolating member (41) and the second vibration-isolating member (42) are made of rubber or urethane. The material and spring constant of the first vibration-isolating member (41) and the material and spring constant of the second vibration-isolating member (42) may be the same as or different from each other.

[0126] The compressor (30) is disposed on a double vibration-isolating structure including a first vibration-isolating member (41), a first support member (51), and a second vibration-isolating member (42). Therefore, even if the compressor (30) vibrates during operation of the refrigeration cycle apparatus (1), transmission of the vibration and generation of noise are suppressed.

[0127] The refrigerant cylinder (5) and the water heat exchanger (15) are supported by a first support member (51). The accumulator (25) is supported by a stay (not shown) at a position spaced apart from the bottom plate (72) of the casing (70).

[0128] The sound insulating member (60) is supported on the bottom plate (72) of the casing (70). The sound insulating member (60) accommodates the compressor (30), the accumulator (25), the refrigerant cylinder (5), the piping (8), and the water heat exchanger (15) in the accommodation space (65). The sound insulating member (60) covers the compressor (30), the accumulator (25), the refrigerant cylinder (5), the piping (8), and the water heat exchanger (15).

[0129] A gap is provided between the outer surface of the sound insulating member (60) and the inner surface of the casing (70). A first sound absorbing material (61) is provided in the gap between the outer surface of the sound insulating member (60) and the inner surface of the casing (70). A second sound absorbing material (62) is provided on the inner surface of the sound insulating member (60).

[0130] A part of the casing (70) has a first wall portion (81). The first wall portion (81) is detachable from the casing (70). The first wall portion (81) is provided on each of the upper panel (71), the front panel (73), and the right panel (76).

[0131] The first sound absorbing material (61) is attached to the inner surface of the first wall portion (81) of the casing (70). When the first wall portion (81) is removed from the casing (70), the first sound absorbing material (61) is removed together with the first wall portion (81), and a first maintenance opening (91) is opened in the casing (70).

[0132] A part of the sound insulating member (60) has a second wall portion (82). The second wall portion (82) is detachable from the sound insulating member (60) at a position corresponding to the first wall portion (81) of the casing (70). The second wall portion (82) is provided on each of the upper wall (85), the front wall (86), and the right side wall (89).

[0133] The second sound absorbing material (62) is attached to the inner surface of the second wall portion (82) of the sound insulating member (60). When the second wall portion (82) is removed from the sound insulating member (60), the second sound absorbing material (62) is removed together with the second wall portion (82), and a second maintenance opening (92) is opened in the sound insulating member (60).

[0134] -Effects of embodiment 7- According to the features of this embodiment, the compressor (30) is supported by a two-layer vibration-proof structure in which a first vibration-proof member (41) and a second vibration-proof member (42) are stacked, thereby making it possible to damp vibrations of the compressor (30).

[0135] This reduces vibrations transmitted from the compressor (30) to the first support member (51) and the second support member (52) and vibrations transmitted from the compressor (30) to the piping (26), thereby suppressing the generation of vibration noise caused by vibrations of the first support member (51) and the second support member (52) and the piping (26).

[0136] According to the features of this embodiment, the first sound absorbing material (61) can be removed together with the first wall portion (81) of the casing (70). Furthermore, the second sound absorbing material (62) can be removed together with the second wall portion (82) of the sound insulating member (60).

[0137] Other Embodiments The refrigeration cycle apparatus (1) may supply the water heated in the water heat exchanger (15) to a supply target other than the hot water tank, such as a bath, a shower, a floor heating system, an air heat exchanger, and the like.

[0138] The heat source unit (20) of the refrigeration cycle apparatus (1) may not have a water heat exchanger (15) and may be connected to a utilization unit via a refrigerant pipe to form a refrigerant circuit. The utilization unit has a utilization heat exchanger that adjusts the temperature of air using a refrigerant. The utilization unit may be an air conditioning unit that conditions the air in a target space. In this case, the air conditioning unit may be a ceiling-mounted, wall-mounted, or floor-standing type. The utilization unit may be a cooling unit that cools the air inside a storage unit. The cooling unit may cool the interior of a shipping container for sea or land transport.

[0139] The heat source unit (20) does not necessarily have to be installed outdoors, but may be installed indoors. In this case, the heat source side heat exchanger is not the outdoor heat exchanger (21), but is configured as a heat exchanger that exchanges heat between a heat medium such as water and a refrigerant.

[0140] 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.

[0141] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for heat source units and refrigeration cycle devices.

[0142] REFRIGERATION CYCLE DEVICE 1 Refrigeration cycle device 20 Outdoor unit (heat source unit) 22 Outdoor fan (fan) 25 Accumulator 30 Compressor 41 First vibration-isolating member 42 Second vibration-isolating member 51 First support member 52 Second support member 60 Sound-insulating member 61 First sound-absorbing material 62 Second sound-absorbing material 65 Storage space 70 Casing 81 First wall portion 82 Second wall portion S1 Machine room (internal space) S2 Blower room

Claims

1. A heat source unit comprising: a casing (70); a compressor (30) disposed in an internal space (S1) of the casing (70) and compressing a refrigerant; an accumulator (25) disposed in the internal space (S1) and connected to the compressor (30); and a sound insulation member (60) disposed in the internal space (S1) and covering the compressor (30) and the accumulator (25) so as to define an accommodation space (65) for accommodating the compressor (30) and the accumulator (25), wherein a gap is provided between an outer surface of the sound insulation member (60) and an inner surface of the casing (70), and a length of the gap, which is the shortest distance between the outer surface of the sound insulation member (60) and the inner surface of the casing (70) facing the outer surface of the sound insulation member (60), is 5 mm or more and 210 mm or less.

2. The heat source unit according to claim 1, wherein a plurality of said gaps are provided along the periphery of said sound insulation member (60), and the length of at least one of said plurality of gaps is not less than 5 mm and not more than 50 mm.

3. A heat source unit according to claim 1 or 2, wherein a part of the casing (70) has a first wall portion (81) detachable from the casing (70), and a part of the sound insulation member (60) has a second wall portion (82) detachable from the sound insulation member (60) at a position corresponding to the first wall portion (81) of the casing (70).

4. A heat source unit according to claim 3, wherein the first wall portion (81) includes an upper wall portion of the casing (70), and the second wall portion (82) includes an upper wall portion of the sound insulation member (60).

5. A heat source unit according to claim 3 or 4, wherein a blower chamber (S2) is provided inside the casing (70), and a fan (22) is arranged in the blower chamber (S2), a direction of air flow by the fan (22) is defined as a first direction, the first wall portion (81) includes a wall portion of the casing (70) facing the first direction, and the second wall portion (82) includes a wall portion of the sound insulation member (60) facing the first direction.

6. A heat source unit according to any one of claims 3 to 5, wherein a blower chamber (S2) is provided inside the casing (70), and a fan (22) is arranged in the blower chamber (S2), a direction of air flow by the fan (22) is a first direction, and a direction perpendicular to the first direction and the vertical direction is a second direction, the first wall portion (81) includes a wall portion of the casing (70) facing the second direction, and the second wall portion (82) includes a wall portion of the sound insulation member (60) facing the second direction.

7. The heat source unit according to any one of claims 3 to 6, further comprising a first sound absorbing material (61) provided between the outer surface of the sound insulation member (60) and the inner surface of the casing (70).

8. The heat source unit according to any one of claims 3 to 7, further comprising a second sound absorbing material (62) provided on the inner surface of the sound insulation member (60).

9. The heat source unit according to claim 8, further comprising a first sound absorbing material (61) provided between the outer surface of the sound insulation member (60) and the inner surface of the casing (70).

10. The heat source unit according to claim 7, wherein the first sound absorbing material (61) is attached to the inner surface of the first wall portion (81) of the casing (70).

11. The heat source unit according to claim 8, wherein the second sound absorbing material (62) is attached to the inner surface of the second wall portion (82) of the sound insulation member (60).

12. A heat source unit according to claim 9, wherein the first sound-absorbing material (61) is attached to the inner surface of the first wall portion (81) of the casing (70), and the second sound-absorbing material (62) is attached to the inner surface of the second wall portion (82) of the sound-insulating member (60).

13. A heat source unit according to any one of claims 1 to 12, comprising: a first vibration-isolating member (41) supporting the compressor (30); a first support member (51) supporting the first vibration-isolating member (41); a second vibration-isolating member (42) supporting the first support member (51); and a second support member (52) supporting the second vibration-isolating member (42).

14. A refrigeration cycle device comprising a heat source unit (20) according to any one of claims 1 to 13.

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