Heat source device

Abstract

This design helps to suppress the increased impact on the cylinder when the casing falls while the compressor is positioned above the cylinder. [Solution] 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 (711) at its bottom for discharging the flammable refrigerant, an accumulator (17) connected to the compressor (12), and a casing (21) having a bottom plate (23) on which the compressor (12), the cylinder (71), and the accumulator (17) are installed. In a top view, a first imaginary line (L1) connecting the center (12b) of the compressor (12) and the center (71b) of the cylinder (71), and a second imaginary line (L2) connecting the center (12b) of the compressor (12) and the center (17b) of the accumulator (17) form a predetermined angle (θ).

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 and an accumulator 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] The inventors of the present application have created a configuration in which a refrigerant cylinder is provided inside the casing of the heat source device. The refrigerant cylinder stores refrigerant for filling the refrigerant circuit. Thereby, when installing the heat source device, refrigerant can be filled from the refrigerant cylinder into the refrigerant circuit, so that it is not necessary to separately prepare the refrigerant for filling. On the other hand, in the configuration of providing a refrigerant cylinder inside the casing, the following specific problems occur.

[0005] During transportation of the heat source equipment before installation at the site, there is a risk of the casing falling. Inside the casing are the compressor, refrigerant cylinder, and accumulator. When the casing falls to the ground, the sides of the bottom plate may come into contact with the ground. In this case, the impact of the fall may cause the compressor to displace and collide with the accumulator, and the impact from the compressor may cause the accumulator to displace, causing the compressor to collide with the refrigerant cylinder with the accumulator in between. In addition, generally speaking, the accumulator is more rigid than the compressor because, unlike the compressor, it is not wrapped in insulation and has a smaller diameter. As a result, when the center of the compressor, the center of the accumulator, and the center of the cylinder are aligned in a straight line, and the compressor collides with the refrigerant cylinder in a series of collisions with the accumulator in between, the impact from the compressor is transmitted to the refrigerant cylinder via the accumulator, which has a smaller diameter and higher rigidity than the compressor. Therefore, there is a concern that the cylinder may be damaged as the compressor collides with the refrigerant cylinder in between. If the refrigerant cylinder is damaged, there is a possibility that the refrigerant will leak into the air. The series of collisions referred to here means that after the compressor and accumulator come into contact, they are displaced together and collide with the cylinder.

[0006] The purpose of this disclosure is to suppress the increased impact on the cylinder when the casing falls in a position where the compressor is located above the cylinder. [Means for solving the problem]

[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 (711) at its bottom for discharging the flammable refrigerant, an accumulator (17) connected to the compressor (12), and a casing (21) having a bottom plate (23) on which the compressor (12), the cylinder (71), and the accumulator (17) are installed. In a top view, the angle between a first imaginary line (L1) connecting the center (12b) of the compressor (12) and the center (71b) of the cylinder (71) and a second imaginary line (L2) connecting the center (12b) of the compressor (12) and the center (17b) of the accumulator (17) forms a predetermined angle (θ).

[0008] In the first embodiment, the first virtual line (L1) and the second virtual line (L2) are arranged to form a predetermined angle (θ) so that the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are not aligned in a straight line, thereby preventing the casing (21) from falling when the compressor (12) is positioned above the cylinder (71), and thus the center of the compressor (12) ( With the center of the compressor (12), the center of the accumulator (17) (17b), and the center of the cylinder (71) (71b) aligned in a straight line, the compressor (12), the accumulator (17), and the cylinder (71) collide in a continuous manner, preventing all of the impact the accumulator (17) receives from the compressor (12) from being directed from the accumulator (17) to the cylinder (71), thereby suppressing an increase in the impact received by the cylinder (71).

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

[0010] In the second embodiment, when the casing (21) falls with the compressor (12) positioned above the cylinder (71), the compressor (12b), the accumulator (17b), and the cylinder (71) are aligned in a straight line, thus preventing a series of collisions between the compressor (12), the accumulator (17), and the cylinder (71). This suppresses an increase in the impact received by the cylinder (71).

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

[0012] In the third embodiment, when the casing (21) falls with the compressor (12) positioned above the cylinder (71), the compressor (12b), the accumulator (17b), and the cylinder (71b) are aligned in a straight line, preventing a series of collisions between the compressor (12), the accumulator (17), and the cylinder (71), thereby suppressing an increase in the impact received by the cylinder (71).

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

[0014] In the fourth embodiment, when the casing (21) falls in a position where the compressor (12) is positioned above the cylinder (71), the compressor (12b), the accumulator (17b), and the cylinder (71b) are aligned in a straight line, preventing a series of collisions between the compressor (12), the accumulator (17), and the cylinder (71), thereby suppressing an increase in the impact received by the cylinder (71).

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

[0016] In the fifth embodiment, when the casing (21) falls with the compressor (12) positioned above the cylinder (71), the compressor (12b), the accumulator (17b), and the cylinder (71b) are aligned in a straight line, preventing a series of collisions between the compressor (12), the accumulator (17), and the cylinder (71), thereby suppressing an increase in the impact received by the cylinder (71).

[0017] The sixth aspect is the third aspect, in which the predetermined angle (θ) is an angle in which, in a top view, a portion of the accumulator (17) that does not include the center (17b) is located within the region (M).

[0018] In the sixth embodiment, the force that causes the compressor (12) to tip over can be suppressed by having it contact the accumulator (17) before it contacts the cylinder (71) when the compressor (12) tips over towards the cylinder (71).

[0019] The seventh embodiment is one of the first to sixth embodiments in which the height of the accumulator (17) from the bottom plate (23) is greater than the height of the cylinder (71) from the bottom plate (23).

[0020] In the seventh embodiment, it is possible to prevent the accumulator (17) from colliding with the body (71d) of the cylinder (71) when it falls over.

[0021] The eighth embodiment includes a height adjustment member that defines the height of the mounting surface of the accumulator (17) from the bottom plate (23) in any one of the first to seventh embodiments.

[0022] In the eighth embodiment, the accumulator (17) can be positioned such that it is higher than the cylinder (71). [Brief explanation of the drawing]

[0023] [Figure 1] Figure 1 is a schematic piping system diagram of a refrigerant circuit of a heat source device according to an embodiment. [Figure 2] Figure 2 is a schematic perspective view of an outdoor unit. [Figure 3] Figure 3 is a front view of the outdoor unit, showing a state in which an access opening on the front side of the machine room is open. [Figure 4] Figure 4 is a plan view schematically showing the interior of the outdoor unit. [Figure 5] Figure 5 is a side view of the interior of the outdoor unit as seen from the right side with the side plates removed. [Figure 6] Figure 6 is a diagram showing the positional relationship among the compressor, the cylinder, and the accumulator in a top view. [Figure 7] Figure 7 is a diagram showing the positional relationship among the compressor, the cylinder, and the accumulator in a top view. [Figure 8] Figures 8(a) and 8(b) are diagrams showing the compressor, the cylinder, and the accumulator when the casing drops with the compressor positioned above the cylinder. [Figure 9] Figures 9(a) to 9(c) are diagrams showing the compressor, the cylinder, and the accumulator when the casing drops with the compressor positioned above the cylinder. [Figure 10] Figure 10 is a diagram showing a state in which the casing drops with the compressor positioned above the cylinder, and the centers of the compressor, the accumulator, and the cylinder are aligned in a straight line, and the compressor continuously collides with the refrigerant cylinder across the accumulator.

Embodiments for Carrying Out the Invention

[0024] 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 explanation of this disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for ease of understanding.

[0025] (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.

[0026] The refrigerant in the refrigerant circuit (11) is a flammable refrigerant. Specifically, the refrigerant in this embodiment is propane (R290), a highly flammable natural refrigerant. Natural refrigerants have a zero ozone depletion potential and a low global warming potential, making them environmentally friendly. Propane ignites at temperatures below 500°C.

[0027] 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).

[0028] (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).

[0029] The compressor (12) compresses the refrigerant. A discharge pipe (18) is connected to the discharge side of the compressor (12), and a suction pipe (19) is connected to the suction side of the compressor (12). The air heat exchanger (13) exchanges heat between the refrigerant and 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).

[0030] The cylinder (71) is connected to the refrigerant circuit (11) via a connecting pipe (72). In this embodiment, the connecting pipe (72) is connected to the suction pipe (19). A control valve (73) is provided on the connecting pipe (72). The cylinder (71) is filled with refrigerant before 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).

[0031] 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.

[0032] (1-2) Water circuit The water circuit (40) is connected to the water heat exchanger (15). The water circuit (40) includes a first water pipe (41) upstream of the water heat exchanger (15) and a second water pipe (42) downstream of the water heat exchanger (15). A pump (43) is connected to the water circuit (40). The pump (43) transports water in the water circuit (40). The water in the water circuit (40) is supplied to 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.

[0033] (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.

[0034] (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).

[0035] A partition member (45) is provided inside the casing (21). The partition member (45) extends from the bottom plate (23) to the top plate (22). 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).

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

[0037] (2-2) Configuration of the fan 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).

[0038] The air heat exchanger (13) is formed in an L-shape when viewed from above. The air heat exchanger (13) has a first heat exchange section (13a) along the rear surface of the fan chamber (S1) and a second heat exchange section (13b) along the left surface of the fan chamber (S1). The air heat exchanger (13) is a fin-and-tube 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.

[0039] 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).

[0040] 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).

[0041] (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). In this embodiment, the first, second, and third directions are perpendicular to each other, the first and second directions are parallel to the horizontal direction, and the third direction is parallel to the vertical direction. In this embodiment, the first direction is the left-right direction, the second direction is the front-back direction, and the third direction is the up-down direction. In other words, the third direction is the direction in which gravity acts (the direction of gravity).

[0042] (3-1) Compressor The compressor (12) is located 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 casing (12a). A discharge pipe (18) is connected to the compressor casing (12a). The compressor (12) is wrapped in insulating material (not shown). The compressor (12) is, for example, a scroll compressor. Inside the compressor casing (12a), there is a compression mechanism (12d) which includes a movable scroll, a fixed scroll, etc., and compresses the refrigerant in a compression chamber formed between the movable scroll and the fixed scroll.

[0043] (3-2) Water heat exchanger The water heat exchanger (15) is 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).

[0044] (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).

[0045] (3-4) Accumulator The accumulator (17) is connected to the suction pipe (19). The accumulator (17) is positioned 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 in a vertically elongated hollow cylindrical shape, with its height greater than its outer diameter. The outer diameter of the accumulator (17) is smaller than the outer diameter of the compressor (12). The rigidity of the accumulator (17) (rigidity of the accumulator (17) casing) is higher than the rigidity of the compressor (12) (rigidity of the compressor casing (12a)). In this embodiment, the accumulator (17) is not wrapped in thermal insulation material.

[0046] (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.

[0047] 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.

[0048] 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).

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

[0050] (3-6) Sound insulation 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).

[0051] 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.

[0052] The sound-insulating member (60) forms an internal space (66) that houses 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).

[0053] 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).

[0054] (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).

[0055] 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.

[0056] The cylinder (71) is formed in 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 lower than that of the compressor casing (12a).

[0057] As shown in Figures 1 and 3, an outlet (711) is formed at the bottom of the cylinder (71). More precisely, the outlet (711) is formed at the bottom of the cylinder (71). Flammable refrigerants have a relatively high density. By placing the outlet (711) 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).

[0058] The connecting pipe (72) is a pipe for injecting the refrigerant from the cylinder (71) into the refrigerant circuit (11). One end of the connecting pipe (72) is connected to the bottom of the cylinder (71) and communicates with the 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).

[0059] 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).

[0060] 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) is installed between the cylinder (71) and the upper surface (23a) of the bottom plate (23). The upper surface (23a) of the bottom plate (23) refers to the vertical upper surface (23a) of the bottom plate (23). The protective member (74) has a partition wall (74a) surrounding the connecting pipe (72) and the control valve (73), and an adjustment member (74c). 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).

[0061] The adjustment member (74c) is, for example, a metal member and includes a leg portion (74c1) and a top plate portion (74c2). The leg portion (74c1) extends vertically. The lower end of the leg portion (74c1) is fixed to the base plate (23). The top plate portion (74c2) is fixed to the upper end of the leg portion (74c1). The top surface of the top plate portion (74c2) is on which the cylinder (71) is mounted and functions as a mounting surface for the cylinder (71). When the length of the leg portion (74c1) is changed, the height of the top surface of the top plate portion (74c2) from the base plate (23) is changed. For example, in the adjustment member (74c), the length of the leg portion (74c1) may be changed by replacing the existing leg portion (74c1) with a leg portion (74c1) of a different length. In this case, the configuration may be such that only the leg portion (74c1) is replaceable, or the adjustment member (74c), which includes the leg portion (74c1) and the top plate portion (74c2), may be replaced. Alternatively, for example, the leg portion (74c1) may include a first rod and a second rod that are slidably connected in the vertical direction, and the length of the leg portion (74c1) may be changed by changing the amount of sliding of the second rod relative to the first rod. In this way, the adjustment member (74c) functions as a height adjustment member that defines the height of the mounting surface of the cylinder (71) from the bottom plate (23).

[0062] (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).

[0063] (4) Characteristics of the arrangement of the compressor, accumulator and refrigerant cylinder As shown in Figure 6, in a top view (viewed from above in the vertical direction), the angle (α) between the first imaginary line (L1) and the second imaginary line (L2) forms a predetermined angle (θ). The first imaginary line (L1) is an imaginary line connecting the center (12b) of the compressor (12) and the center (71b) of the cylinder (71). The second imaginary line (L2) is an imaginary line connecting the center (12b) of the compressor (12) and the center (17b) of the accumulator (17). The center (12b) of the compressor (12) is the center of the outer circumference of the compressor casing (compressor casing (12a)), which is approximately circular in shape in a top view. The center (71b) of the cylinder (71) is the center of the outer circumference of the cylinder casing (71a), which is approximately circular in shape in a top view. The center (17b) of the accumulator (17) is the center of the outer circumference of the accumulator (17a), which is approximately circular in shape when viewed from above. The angle (α) between the first virtual line (L1) and the second virtual line (L2) is the smaller of the two angles made between the first virtual line (L1) and the second virtual line (L2).

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

[0065] Generally, unlike the compressor (12), the accumulator (17) is not wrapped in insulation, and is smaller in diameter and more rigid than the compressor (12). Therefore, when it collides with the cylinder (71), the impact on the cylinder (71) tends to be greater.

[0066] In this embodiment, when viewed from above, the angle (α) between the first virtual line (L1) and the second virtual line (L2) is configured to form a predetermined angle (θ), so that the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) are not arranged to be in a straight line. As a result, as shown in Figures 8(a) and 8(b), for example, if the casing (21) falls (with the compressor (12) positioned above the cylinder (71)) and makes contact with the ground, the impact causes the compressor (12) to detach from the bottom plate (23) (or support plate (51)) and displace toward the cylinder (71), and if the accumulator (17) is not located within region (M), the compressor (12) will collide with the cylinder (71) without colliding with it, thus preventing the accumulator (17) from colliding with the cylinder (71). In other words, as shown in Figure 10, the compressor (12) indirectly collides with the cylinder (71) with the accumulator (17) in between, thereby preventing the accumulator (17) from colliding with the cylinder (71). According to this, because the accumulator (17) has higher rigidity than the compressor (12), the impact on the cylinder (71) is smaller when the compressor (12) collides directly with the cylinder (71) than when the accumulator (17) collides directly with the cylinder (71), thus suppressing an increase in the impact on the cylinder (71). The arrow Z in the figure indicates the direction of the fall of the casing (21) when the casing (21) falls from its side (21a).

[0067] Furthermore, as shown in Figure 9(a), if the center (17b) of the accumulator (17) is not located within region (M), but a part of the accumulator (17) is located within region (M), the compressor (12) will be displaced toward the cylinder (71) due to the impact of the casing (21) falling, and will collide with the accumulator (17). As a result, the accumulator (17) will be displaced together with the compressor (12), and the accumulator (17) will collide with the cylinder (71) as shown in Figure 9(b) or Figure 9(c). However, at the time of collision, the center (12b) of the compressor (12), the center (17b) of the accumulator (17), and the center (71b) of the cylinder (71) do not align in a straight line (see Figure 10). Instead, as shown in Figure 9(b) or Figure 9(c), the center (17b) of the accumulator (17) is located at a position offset from the first imaginary line (L1) connecting the center (12b) of the compressor (12) and the center (71b) of the cylinder (71), and the accumulator (17) collides with the cylinder (71). In the state shown in Figure 9(b), the center (17b) of the accumulator (17) is located at a position offset from the first imaginary line (L1), and the accumulator (17) collides with the cylinder (71), and then the compressor (12) collides with the cylinder (71). In the case shown in Figure 9(b), a portion of the impact (force transmitted from the compressor (12)) (F) transmitted from the compressor (12) to the accumulator (17) acts perpendicular to the direction in which force is transmitted from the accumulator (17) to the cylinder (71), thus suppressing the force acting from the accumulator (17) to the cylinder (71). Also, in the case shown in Figure 9(b), the compressor (12) collides with the cylinder (71), but because the momentum of the compressor (12) is reduced by the collision with the accumulator (17), the increase in the impact received by the cylinder (71) can be suppressed. Furthermore, in the case shown in Figure 9(c), the compressor (12) collides with the cylinder (71) with the accumulator (17) in between, but the impact (F1) transmitted from the compressor (12) to the accumulator (17) is distributed into a portion directed towards the cylinder (71) (F1) and a portion directed away from the cylinder (71) (F2).This prevents all of the impact (F) that the accumulator (17) receives from the compressor (12) during a collision from the compressor (12) from being directed from the accumulator (17) to the cylinder (71), and allows a portion of the impact (F2) to be dispersed away from the cylinder (71) (in the direction away from the first virtual line (L1)), thereby suppressing an increase in the impact received by the cylinder (71) from the accumulator (17). As a result, when the casing (21) falls in a position where the compressor (12) is located above the cylinder (71), an increase in the impact received by the cylinder (71) can be suppressed.

[0068] The predetermined angle (θ) may also be the angle at which, as shown in Figure 7, the accumulator (17) (the entire accumulator (17)) is located away from the region (M) between the compressor (12) and the cylinder (71) in a top view. The predetermined angle (θ) may also be 90 degrees or greater. This prevents the compressor (12) from colliding with the cylinder (71) and the accumulator (17) from colliding with the cylinder (71) when the casing (21) falls with the compressor (12) positioned above the cylinder (71), thereby suppressing an increase in the impact received by the cylinder (71).

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

[0070] Furthermore, the predetermined angle (θ) may be an angle in which the center (17b) of the accumulator (17) is located outside the region (M), as shown in Figure 9(a), and a portion of the accumulator (17) that does not include the center (17b) is located within the region (M). This allows the force that causes the compressor (12) to tip over to be suppressed by ensuring that the accumulator (17) makes contact with the compressor (12) before it makes contact with the cylinder (71) when the compressor (12) tips over towards the cylinder (71).

[0071] (5) Variant The height of the accumulator (17) from the bottom plate (23) may be greater than the height of the cylinder (71) from the bottom plate (23). This allows the accumulator (17) to tip over toward the cylinder (71) due to the impact when the casing (21) falls and hits the ground, for example, but the body (17c) of the accumulator (17) will collide with the top (71c) of the cylinder (71). As a result, it is possible to prevent the accumulator (17) from colliding with the body (71d), which is a more fragile part of the cylinder (71) compared to the upper and lower ends, thus preventing damage to the cylinder (71). The body (71d) of the cylinder (71) is the part located in the center of the cylinder (71).

[0072] The heat source device (1) may include a height adjustment member that defines the height of the mounting surface of the accumulator (17) from the bottom plate (23). The height adjustment member is positioned between the bottom plate (23) and the accumulator (17). The height adjustment member is, for example, a metal member and comprises a top plate portion including the mounting surface on which the accumulator (17) is installed, and a leg portion positioned between the top plate portion and the bottom plate (23). When the length of the leg portion is changed, the height of the mounting surface of the top plate portion from the bottom plate (23) is changed. For example, in the height adjustment member, the length of the leg portion may be changed by replacing an existing leg portion with a leg portion of a different length. In this case, the height adjustment member may be configured so that only the leg portion is replaced, or the height adjustment member itself may be configured to be replaced. Alternatively, for example, the leg portion may include a first rod and a second rod that are slidably connected in the vertical direction, and the length of the leg portion may be changed by changing the amount of slide of the second rod relative to the first rod. This allows the height adjustment member to define the height of the mounting surface of the accumulator (17) from the bottom plate (23). As a result, the accumulator (17) can be positioned such that its height from the bottom plate (23) is greater than its height from the bottom plate (23) of the cylinder (71).

[0073] 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]

[0074] As explained above, this disclosure is useful for heat source devices. [Explanation of Symbols]

[0075] 1 Heat source device 11 Refrigerant Circuit 12 Compressor 12b Compressor center 17 Accumulator 17b Center of the accumulator 21 Casing 23 Bottom plate 71 cylinders 71b Center of the cylinder L1 First Virtual Line L2 Second Virtual Line θ is a predetermined 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 (711) at its bottom for discharging the flammable refrigerant, The accumulator (17) connected to the compressor (12) and A casing (21) having a bottom plate (23) on which the compressor (12), the cylinder (71), and the accumulator (17) are installed, Equipped with, A heat source device in which, in a top view, the angle (α) between a first imaginary line (L1) connecting the center (12b) of the compressor (12) and the center (71b) of the cylinder (71) and a second imaginary line (L2) connecting the center (12b) of the compressor (12) and the center (17b) of the accumulator (17) forms a predetermined angle (θ).

2. The heat source device according to claim 1, wherein the predetermined angle (θ) is an angle in which, in a top view, the accumulator (17) is not located on the portion (L11) of the first imaginary line (L1) that is located between the compressor (12) and the cylinder (71).

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

4. The heat source device according to claim 1, wherein the predetermined angle (θ) is an angle at which, in a top view, the accumulator (17) is located away from the region (M) located between the compressor (12) and the cylinder (71).

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

6. The heat source device according to claim 3, wherein the predetermined angle (θ) is an angle in which, when viewed from above, a portion of the accumulator (17) that does not include the center (17b) is located within the region (M).

7. The heat source device according to any one of claims 1 to 6, wherein the height of the accumulator (17) from the bottom plate (23) is greater than the height of the cylinder (71) from the bottom plate (23).

8. The heat source device according to claim 7, further comprising a height adjustment member that defines the height of the mounting surface of the accumulator (17) from the bottom plate (23).

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