Refrigeration equipment

Abstract

To provide a refrigerating device that comprises a unit including first and second air heat exchangers, and restrains the risk of damage to the second air heat exchanger.SOLUTION: A refrigerating device 10 comprises: a first refrigerant circuit RC1 including a first compressor 21, a first heat exchanger 31, a first expansion valve 41, and a utilization side heat exchanger 34, and using a first refrigerant R1; a second refrigerant circuit RC2 including a second compressor 22, a second heat exchanger 32, and a second expansion valve 42, and using a second refrigerant R2; a third heat exchanger 33 for exchanging heat between the first refrigerant R1 and the second refrigerant R2; and a fan 15. A heat transfer pipe constituting the first heat exchanger 31 is a circular pipe 31a. A heat transfer pipe constituting the second heat exchanger 32 is a flat perforated pipe 32a. The second heat exchanger 32 is arranged on a leeward side of the first heat exchanger 31 in a direction F of a flow of air generated by the fan 15.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to refrigeration devices. [Background technology]

[0002] A refrigeration system is disclosed that includes a unit including a first refrigerant circuit that is responsible for the main cooling capacity, a second refrigerant circuit that supplements the cooling capacity of the first refrigerant circuit, and a heat exchanger that exchanges heat between the first refrigerant in the first refrigerant circuit and the second refrigerant in the second refrigerant circuit (see Patent Document 1). In the refrigeration system, the first refrigerant and the second refrigerant are different types of refrigerant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2014 / 181399 Summary of the Invention [Problem to be solved by the invention]

[0004] In the refrigeration device, the first air heat exchanger of the first refrigerant circuit and the second air heat exchanger of the second refrigerant circuit may be arranged side by side on the upwind side and the downwind side in the flow direction of the air to be heat exchanged in the unit. When the second air heat exchanger is arranged on the upwind side of the first air heat exchanger, the second air heat exchanger is arranged on the outermost side of the unit. In the unit configured in this way, the second air heat exchanger is easily damaged because external forces and the like are likely to act on it during transportation.

[0005] The present disclosure aims to reduce the risk of damage to the second air heat exchanger in a refrigeration device equipped with a unit including first and second air heat exchangers. [Means for solving the problem]

[0006] (1) The refrigeration device of the present disclosure includes a first refrigerant circuit including a first compressor, a first heat exchanger, a first expansion valve, and a user side heat exchanger, and using a first refrigerant, a second refrigerant circuit including a second compressor, a second heat exchanger, and a second expansion valve, and using a second refrigerant, a third heat exchanger that exchanges heat between the first refrigerant and the second refrigerant, and a fan, wherein a heat transfer tube that constitutes the first heat exchanger is a circular tube, and a heat transfer tube that constitutes the second heat exchanger is a flat multi-hole tube, and the second heat exchanger is positioned on the downwind side of the first heat exchanger in the flow direction of air generated by the fan.

[0007] The refrigeration device of the present disclosure includes a first heat exchanger using a circular tube as a heat transfer tube, and a second heat exchanger using a flat multi-hole tube as a heat transfer tube. The flat multi-hole tube is weaker against external forces than the circular tube. In the refrigeration device of the present disclosure, the first heat exchanger is disposed on the windward side in the air flow direction than the second heat exchanger, so that the first heat exchanger is disposed outside the second heat exchanger. In the refrigeration device of the present disclosure, the first heat exchanger using a circular tube as a heat transfer tube is disposed on the windward side in the air flow direction than the second heat exchanger using a flat multi-hole tube as a heat transfer tube, so that the risk of the second heat exchanger being damaged when an external force acts on a unit including the first heat exchanger and the second heat exchanger can be reduced.

[0008] (2) In the refrigeration device of (1) of the present disclosure, it is preferable that the second heat exchanger is composed of a heat exchanger including a plurality of the flat multi-hole tubes and serpentine fins arranged between adjacent flat multi-hole tubes.

[0009] In the heat exchanger having the above configuration, the flat multi-hole tube and the fins are flush with each other, so the flat multi-hole tube is not protected by the fins. Therefore, in the heat exchanger having the above configuration, the flat multi-hole tube is easily damaged by being directly subjected to an external force. When the heat exchanger having the above configuration is used as the second heat exchanger, the refrigeration device disclosed herein can reduce the risk of the flat multi-hole tube being damaged. By using the heat exchanger having the above configuration, the refrigeration device disclosed herein can reduce the amount of second refrigerant used.

[0010] (3) In the refrigeration device of (1) or (2) of the present disclosure, it is preferable that the fan is arranged on the downwind side of the second heat exchanger in the air flow direction, and the second heat exchanger is fixed to a support member that supports the fan.

[0011] In the refrigeration device having the above configuration, the fan is disposed on the downwind side of the second heat exchanger in the air flow direction. Therefore, the refrigeration device of the present disclosure can fix the second heat exchanger using a support member for fixing the fan.

[0012] (4) In a refrigeration device according to any one of aspects (1) to (3) of the present disclosure, it is preferable that the first heat exchanger has a first region that overlaps with the second heat exchanger when viewed from the air flow direction, and a second region that does not overlap with the second heat exchanger when viewed from the air flow direction.

[0013] In a refrigeration device having a first heat exchanger and a second heat exchanger, if the two heat exchangers have the same outer dimensions and are in the same outer positions when viewed from the air flow direction, the two heat exchangers can be easily supported by using a common support member. On the other hand, if the outer dimensions of the heat exchangers are different and the outer positions when viewed from the air flow direction are shifted, it is difficult to support the two heat exchangers using a common support member. In the refrigeration device of the present disclosure, even if the first heat exchanger has a first region that overlaps with the second heat exchanger and a second region that does not overlap with the second heat exchanger when viewed from the air flow direction, the second heat exchanger can be fixed using a support member for fixing the fan.

[0014] (5) In a refrigeration device according to any one of aspects (1) to (3) of the present disclosure, when viewed from the air flow direction, the first heat exchanger and the second heat exchanger are preferably configured such that an area of ​​a fourth region defined by the contour of the second heat exchanger is smaller than an area of ​​a third region defined by the contour of the first heat exchanger, and the fourth region is included in the third region.

[0015] In a refrigeration device having a configuration including a first heat exchanger and a second heat exchanger, if the two heat exchangers have the same external dimensions, the two heat exchangers can be easily supported by using a common support member. On the other hand, if the two heat exchangers have different external dimensions, the larger heat exchanger can be easily supported by using the frame of the housing that houses the heat exchanger, but it is difficult to support the smaller heat exchanger by using the frame of the housing. In the refrigeration device disclosed herein, even if the external dimensions of the second heat exchanger are smaller than the external dimensions of the first heat exchanger when viewed from the air flow direction and the second heat exchanger fits inside the external dimensions of the first heat exchanger, the second heat exchanger can be fixed using a support member for fixing the fan. [Brief description of the drawings]

[0016] [Figure 1] 1 is an explanatory diagram of a refrigerant circuit of a refrigeration device according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional explanatory diagram of a heat source side unit in a refrigeration apparatus as viewed from above. [Diagram 3] FIG. 2 is a cross-sectional explanatory side view of a heat source unit in the refrigeration apparatus. [Figure 4] 13 is a cross-sectional explanatory side view showing another embodiment of a supporting state of the second heat exchanger. FIG. [Diagram 5] FIG. 2 is a schematic diagram showing a first heat exchanger in the refrigeration device. [Figure 6] FIG. 4 is a schematic diagram showing a second heat exchanger in the refrigeration device. [Figure 7] 4 is a partial cross-sectional schematic view showing a heat transfer tube and fins that configure a second heat exchanger. FIG. [Figure 8A] FIG. 2 is an explanatory diagram of the positional relationship when the first heat exchanger and the second heat exchanger according to the first embodiment are viewed from the air flow direction. [Figure 8B] FIG. 11 is an explanatory diagram of the positional relationship when a first heat exchanger and a second heat exchanger according to a second embodiment are viewed from the air flow direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] (Overall configuration of the refrigeration system) Hereinafter, an embodiment of the refrigeration device of the present disclosure will be described in detail with reference to the accompanying drawings. FIG. 1 is an explanatory diagram of a refrigerant circuit of a refrigeration device according to an embodiment of the present disclosure. As shown in FIG. 1, a refrigeration device 10 of the present disclosure includes a heat source unit 11, a user unit 12, a refrigerant pipe 13 connecting the heat source unit 11 and the user unit 12, and a fan 15. The refrigeration device 10 illustrated in this embodiment is an air conditioner that conditions a target space using the user unit 12. The refrigeration device 10 is a separate type air conditioner separated into a heat source unit (outdoor unit) 11 and a user unit (indoor unit) 12. Note that, although the refrigeration device 10 illustrated in this embodiment is an air conditioner, the refrigeration device of the present disclosure may be, for example, a refrigeration case, and is not limited to an air conditioner. The refrigerant pipe 13 includes a gate valve 18 at a portion where the refrigerant enters and leaves the housing of the heat source unit 11.

[0018] The heat source side unit 11 includes a first compressor 21, a second compressor 22, a first heat exchanger 31, a second heat exchanger 32, a third heat exchanger 33, a first expansion valve 41, a second expansion valve 42, a four-way switching valve 50, a first accumulator 51, and a second accumulator 52. The utilization side unit 12 includes a utilization side heat exchanger 34.

[0019] The refrigeration device 10 includes a first refrigerant circuit RC1 including a first compressor 21, a first heat exchanger 31, a first expansion valve 41, a utilization side heat exchanger 34, and a refrigerant pipe 13 connecting these, and a second refrigerant circuit RC2 including a second compressor 22, a second heat exchanger 32, a second expansion valve 42, and a refrigerant pipe 14 connecting these. The first refrigerant circuit RC1 uses a first refrigerant R1 as a refrigerant and performs a refrigeration cycle operation. The second refrigerant circuit RC2 uses a second refrigerant R2 different from the first refrigerant R1 as a refrigerant and performs a refrigeration cycle operation.

[0020] The first compressor 21 and the second compressor 22 suck in low-pressure gas refrigerant and discharge high-pressure gas refrigerant. The first compressor 21 and the second compressor 22 are equipped with a motor (not shown) capable of adjusting the operating rotation speed by inverter control. The first compressor 21 and the second compressor 22 are variable capacity type (variable capacity type) in which the capacity (capacity) can be changed by inverter control of the motor. However, the first compressor 21 and the second compressor 22 may be a fixed capacity type.

[0021] The four-way switching valve 50 reverses the flow of the first refrigerant R1 in the refrigerant pipe 13 of the first refrigerant circuit RC1, and can switch whether the first refrigerant R1 discharged from the first compressor 21 is supplied to the first heat exchanger 31 or the utilization side heat exchanger 34. The refrigeration system 10 can switch between cooling operation and heating operation by switching the flow direction of the first refrigerant R1 with the four-way switching valve 50. Note that the refrigeration system 10 of this embodiment may be used exclusively for cooling by omitting the four-way switching valve.

[0022] The first expansion valve 41 is configured with an electric valve capable of adjusting the flow rate of the first refrigerant R1. During cooling operation, the refrigeration device 10 adjusts the cooling capacity exerted by the first refrigerant circuit RC1 by adjusting the opening of the first expansion valve 41 with a control device (not shown). During heating operation, the refrigeration device 10 fully opens the first expansion valve 41 with a control device (not shown).

[0023] The second expansion valve 42 is configured by an electric valve capable of adjusting the flow rate of the second refrigerant R2. During cooling operation, the refrigeration device 10 adjusts the cooling capacity exerted by the second refrigerant circuit RC2 by adjusting the opening degree of the second expansion valve 42 using a control device (not shown).

[0024] The refrigeration system 10 supplements the cooling capacity of the first refrigerant circuit RC1 with the cooling capacity of the second refrigerant circuit RC2 by exchanging heat between the first refrigerant R1 and the second refrigerant R2 in the third heat exchanger 33. During cooling operation, the refrigeration system 10 adjusts the amount of heat exchange between the first refrigerant R1 and the second refrigerant R2 by a control device (not shown) adjusting the opening degree of the second expansion valve 42.

[0025] [Heat source unit] FIG. 2 is a cross-sectional explanatory diagram of a heat source unit in a refrigeration device in a plan view. FIG. 3 is a cross-sectional explanatory diagram of a heat source unit in a refrigeration device in a side view. In the following description, the descriptions of up, down, front, rear, left, and right follow the arrows shown in FIG. 2 and FIG. 3. Specifically, for example, in FIG. 2 and FIG. 3, among the mutually orthogonal arrows X, Y, and Z, the direction indicated by the arrow X (first direction) is the left-right direction, the direction indicated by the arrow Y (second direction) is the front-rear direction, and the direction indicated by the arrow Z (third direction) is the up-down direction. In the following description, the left-right direction is also referred to as the first direction X, the front-rear direction is also referred to as the second direction Y, and the up-down direction is also referred to as the third direction Z. However, these descriptions are merely examples, and for example, the direction X may be read as the front-rear direction, and the direction Y may be read as the left-right direction.

[0026] As shown in Figs. 1 to 3, the heat source side unit 11 includes a housing 60. As shown in Figs. 2 and 3, the housing 60 is formed in a rectangular parallelepiped shape, and is formed in a rectangular shape in a plan view. The inside of the housing 60 is divided into a machine chamber S1 and a heat exchange chamber S2 by a partition wall 61. Air intakes 64, 65 are formed in two adjacent side walls 62, 63 of the housing 60 arranged on the heat exchange chamber S2 side. An air outlet 67 is formed in the other side wall 66 adjacent to the one side wall 63 in which the air intake 65 is formed.

[0027] The machine room S1 accommodates the first compressor 21, the second compressor 22, the third heat exchanger 33, the first accumulator 51, and the second accumulator 52. In addition to these, the machine room S1 also accommodates a four-way switching valve 50 (not shown), a first expansion valve 41 (not shown), a second expansion valve 42 (not shown), an oil separator, etc. A control board (not shown) is disposed in the machine room S1, and each device constituting the refrigeration device 10 is controlled by this control board.

[0028] The heat exchange chamber S2 accommodates a first heat exchanger 31, a second heat exchanger 32, a fan 15, and a fan motor 16. The fan 15 is connected to a rotating shaft of the fan motor 16, and is driven to rotate by the fan motor 16.

[0029] The first heat exchanger 31 has a heat transfer tube (heat transfer tube 31a described later) through which the first refrigerant R1 circulating in the first refrigerant circuit RC1 flows. The first heat exchanger 31 is connected to the first compressor 21 in the machine room S1 via a refrigerant pipe 13 (see FIG. 1). The second heat exchanger 32 has a heat transfer tube (heat transfer tube 32a described later) through which the second refrigerant R2 circulating in the second refrigerant circuit RC2 flows. The second heat exchanger 32 is connected to the second compressor 22 in the machine room S1 via a refrigerant pipe 14 (see FIG. 1).

[0030] The fan 15 is disposed in such a position that the positive pressure side faces the side wall 66 on which the air outlet 67 is formed, and the negative pressure side faces the side wall 62 on which the air inlet 64 is formed. When the fan motor 16 is operated, the fan 15 rotates, and air is taken into the heat exchange chamber S2 through the air inlets 64 and 65. The air taken into the heat exchange chamber S2 passes through the first heat exchanger 31 and is heat exchanged with the first refrigerant R1, and then passes through the second heat exchanger 32 and is heat exchanged with the second refrigerant R2, and is then exhausted from the air outlet 67. The fan 15 generates an air flow passing through the first heat exchanger 31 and the second heat exchanger 32. The refrigerant passing through the insides of the first heat exchanger 31 and the second heat exchanger 32 exchanges heat with the air passing through the first heat exchanger 31 and the second heat exchanger 32. As shown in FIG. 1 to FIG. 3, the direction of the air flow generated by the fan 15 is indicated by an arrow F. In the following description, the air flow direction will be referred to as air flow direction F.

[0031] The first heat exchanger 31 shown in this embodiment is formed in an L-shape in a plan view. The first heat exchanger 31 is bent near a corner 68 between two side walls 62, 63 in which air intakes 64, 65 are formed, and is disposed along the two side walls 62, 63. Note that the shape of the first heat exchanger 31 provided in the refrigeration device 10 of the present disclosure is not limited thereto, and may be, for example, rectangular in a plan view.

[0032] The second heat exchanger 32 shown in this embodiment is formed in a rectangular shape in a plan view. The second heat exchanger 32 is disposed along a portion along the side wall 62 of the first heat exchanger 31, on the downwind side of the first heat exchanger 31 in the air flow direction F. Note that the shape of the second heat exchanger 32 included in the refrigeration device 10 of the present disclosure is not limited to this.

[0033] [1st heat exchanger] Fig. 5 is a schematic diagram showing a first heat exchanger in a refrigeration device. As shown in Fig. 5, the first heat exchanger 31 constituting the refrigeration device 10 of the present disclosure is a so-called cross-fin type fin-and-tube heat exchanger. The first heat exchanger 31 has a heat transfer tube 31a, a plurality of fins 31b, and a pair of tube plates 31c, 31d. The first heat exchanger 31 exchanges heat between the first refrigerant R1 in the first refrigerant circuit RC1 and the air passing through the first heat exchanger 31.

[0034] The heat transfer tube 31a is a circular tube made of metal. The metal constituting the heat transfer tube 31a may be copper, a copper alloy, stainless steel, aluminum, an aluminum alloy, or the like. Hereinafter, the heat transfer tube 31a is also referred to as a circular tube 31a. The multiple fins 31b are thin metal plates formed into a rectangular shape in a side view, and are arranged parallel to each other at a predetermined interval in the width direction (first direction X). The metal constituting the fins 31b may be aluminum, an aluminum alloy, or the like.

[0035] The circular tube (heat transfer tube) 31a includes a plurality of straight tube sections 31x formed in a linear shape and a plurality of curved tube sections 31y formed in a U-shape. The straight tube sections 31x penetrate the fins 31b in the direction in which the many fins 31b are arranged (first direction X). The curved tube sections 31y are disposed at the end of the first heat exchanger 31 in the width direction (first direction X) and connect two adjacent straight tube sections 31x to each other.

[0036] The tube sheets 31c, 31d are metal plates formed into a rectangular shape in a side view, and are arranged in pairs on both sides in the width direction (first direction X) of the first heat exchanger 31. The tube sheets 31c, 31d are connected to both ends of each straight tube portion 31x of the circular tube 31a, and support the circular tube 31a. The tube sheets 31c, 31d are arranged parallel to the fins 31b, as shown in FIG. 5.

[0037] [Second heat exchanger] FIG. 6 is a schematic diagram showing a second heat exchanger in a refrigeration device. FIG. 7 is a partial cross-sectional schematic diagram showing a heat transfer tube and a fin constituting the second heat exchanger. The second heat exchanger 32 constituting the refrigeration device 10 of the present disclosure is a microchannel type heat exchanger. As shown in FIG. 6 and FIG. 7, the second heat exchanger 32 has a plurality of heat transfer tubes 32a, fins 32b, and a pair of headers 32c, 32d. The heat transfer tubes 32a, the fins 32b, and the headers 32c, 32d are formed of aluminum or an aluminum alloy. The second heat exchanger 32 exchanges heat between the second refrigerant R2 in the second refrigerant circuit RC2 and the air passing through the second heat exchanger 32.

[0038] As shown in FIG. 7, the heat transfer tube 32a is configured as a multi-hole tube having a plurality of refrigerant flow paths 35 therein. The cross section of the heat transfer tube 32a has a flat shape having a short side direction and a long side direction. The heat transfer tube 32a has a longitudinal direction in which the plurality of refrigerant flow paths 35 are arranged. The plurality of refrigerant flow paths 35 are arranged along the air flow direction F. As shown in FIG. 6 and FIG. 7, the plurality of refrigerant flow paths 35 are arranged in the second direction Y and extend in the first direction X. Hereinafter, the heat transfer tube 32a is also referred to as a flat multi-hole tube 32a.

[0039] As shown in Figs. 6 and 7, in the second heat exchanger 32, a plurality of heat transfer tubes 32a are arranged in the third direction Z. The headers 32c and 32d are arranged with their longitudinal directions facing the third direction Z. One end of the heat transfer tube 32a is connected to the header 32c, and the other end of the heat transfer tube 32a is connected to the header 32d. The fins 32b are arranged in a serpentine manner between the heat transfer tubes 32a adjacent to each other above and below. Note that the orientation of the second heat exchanger 32 in the refrigeration device 10 of this embodiment is not limited thereto, and may be used in an orientation in which the third direction Z faces the left-right direction, for example.

[0040] 7, the end faces of the flat multi-hole tube 32a in the third direction Z, in other words, the upper and lower faces of the flat multi-hole tube 32a, are flat surfaces along the first direction X and the second direction Y. Both end faces of the flat multi-hole tube 32a in the first direction X are curved surfaces whose cross sections are curved in a semicircular shape.

[0041] The fins 32b have approximately the same length as the flat multi-hole tubes 32a in the second direction Y. Therefore, in the second heat exchanger 32, the flat multi-hole tubes 32a and the fins 32b are flush with each other at both end faces in the second direction Y.

[0042] In general, a heat transfer tube made of a flat multi-hole tube (flat multi-hole tube 32a) is more likely to be damaged when an external force acts on it than a heat transfer tube made of a circular tube (circular tube 31a). Therefore, when an external force acts on the flat multi-hole tube 32a, there is a higher risk of serious damage compared to when an external force acts on the circular tube 31a. Therefore, the second heat exchanger 32 including the flat multi-hole tube 32a has a higher protection priority than the first heat exchanger 31 including the circular tube 31a, and is preferably disposed in a location less susceptible to external forces.

[0043] The second heat exchanger 32 of this embodiment is a so-called parallel flow type heat exchanger among microchannel type heat exchangers. The heat transfer tubes constituting the second heat exchanger 32 are flat multi-hole tubes 32a, and the fins 32b are serpentine fins arranged between adjacent flat multi-hole tubes. The fins 32b are so-called corrugated fins. In general, when a cross-fin type heat exchanger and a parallel flow type heat exchanger having the same heat exchange amount are compared, the parallel flow type heat exchanger has a smaller internal volume (internal liquid amount) than the cross-fin type heat exchanger. Therefore, by adopting a parallel flow type heat exchanger as the second heat exchanger 32, the refrigeration device 10 can reduce the usage amount of the second refrigerant R2 compared to the case where a cross-fin type heat exchanger is adopted.

[0044] [Third heat exchanger] The third heat exchanger 33 constituting the refrigeration device 10 of the present disclosure is a plate-type heat exchanger. As shown in FIG. 1, the third heat exchanger 33 has a first flow path 33a and a second flow path 33b formed between stacked plates. In the third heat exchanger 33, the first flow path 33a is connected to the first refrigerant circuit RC1, and the first refrigerant R1 flows through the first flow path 33a. In the third heat exchanger 33, the second flow path 33b is connected to the second refrigerant circuit RC2, and the second refrigerant R2 flows through the second flow path 33b. The third heat exchanger 33 exchanges heat between the first refrigerant R1 flowing through the first flow path 33a and the second refrigerant R2 flowing through the second flow path 33b. The refrigeration device 10 exchanges heat between the first refrigerant R1 and the second refrigerant R2 by the third heat exchanger 33, and supplements the cooling capacity of the first refrigerant circuit RC1 with the cooling capacity of the second refrigerant circuit RC2.

[0045] (Regarding the first and second refrigerants) The refrigeration device 10 of the present disclosure preferably uses natural refrigerants as the first refrigerant R1 and the second refrigerant R2. Natural refrigerants are refrigerants that use substances that originally exist in nature, and include, for example, ammonia (NH3), carbon dioxide (CO2), water (H2O), and hydrocarbons (HC). The refrigeration device 10 of this embodiment uses carbon dioxide (CO2: R744) as the first refrigerant R1 and propane (C3H8: R290) as the second refrigerant R2. The global warming potential (GWP) of carbon dioxide (CO2) is "1", and the global warming potential (GWP) of propane (C3H8) is "3". Note that the first refrigerant R1 used in the refrigeration device of the present disclosure is not limited to carbon dioxide (CO2), and the second refrigerant R2 used in the refrigeration device of the present disclosure is not limited to propane (C3H8). The first refrigerant R1 and the second refrigerant R2 used in the refrigeration device of the present disclosure may be R32, R1234yf, R474a, R600a (isobutane), R454B, R454C, or the like.

[0046] (Arrangement of the first and second heat exchangers) As shown in FIGS. 1 to 3, in the refrigeration device 10, the second heat exchanger 32 is disposed on the downwind side of the first heat exchanger 31 in the flow direction F of the air generated by the fan 15.

[0047] In the heat source side unit 11, when the second heat exchanger 32 is disposed on the downwind side of the first heat exchanger 31 in the air flow direction F, the first heat exchanger 31 is disposed outside the second heat exchanger 32. In the heat source side unit 11 configured in this manner, when some external force acts on the heat source side unit 11 during transportation or the like, the external force acts mainly on the first heat exchanger 31 located further outward, not on the second heat exchanger 32. Therefore, in the refrigeration device 10, when an external force acts on the heat source side unit 11 including the first heat exchanger 31 and the second heat exchanger 32, the external force is unlikely to act directly on the second heat exchanger 32, and this makes it possible to reduce the risk of the second heat exchanger 32 being damaged.

[0048] (Layout Relationship According to the First Embodiment) 8A is an explanatory diagram of the positional relationship when the first heat exchanger and the second heat exchanger according to the first embodiment are viewed from the air flow direction. In the refrigeration device 10 according to the first embodiment, the first heat exchanger 31 may have a first region A1 that overlaps with the second heat exchanger 32 when viewed from the air flow direction F, and a second region A2 that does not overlap with the second heat exchanger 32 when viewed from the air flow direction F. In this description, the region showing the first heat exchanger 31 is the region between a pair of tube plates 31c, 31d (see FIG. 5), and the region showing the second heat exchanger 32 is the region between a pair of headers 32c, 32d (see FIG. 6).

[0049] As shown in Figure 8A, when the two heat exchangers 31 and 32 have different external dimensions and are misaligned when viewed from the air flow direction F, it is difficult to support the two heat exchangers 31 and 32 using a common support member, and it becomes necessary to provide a support member for supporting the second heat exchanger 32 separately from the support member for the first heat exchanger 31.

[0050] In the refrigeration device 10 of this embodiment, the second heat exchanger 32 is disposed on the leeward side of the first heat exchanger 31 in the air flow direction F, so that the second heat exchanger 32 can be supported by using a support member 70 (see Figs. 2 and 3) for supporting the fan 15. Specifically, as shown in Fig. 3, the second heat exchanger 32 is supported at its lower part by a first stay 71 provided at the lower part of the support member 70. Note that, as shown in Fig. 4, the second heat exchanger 32 may be further supported at its upper part by a second stay 72 provided midway in the vertical direction of the support member 70. Therefore, in the refrigeration device 10 of this embodiment, even if the first heat exchanger 31 is configured to have a first region A1 overlapping with the second heat exchanger 32 and a second region A2 not overlapping with the second heat exchanger 32 when viewed from the air flow direction F, the second heat exchanger 32 can be supported by the support member 70 without providing a separate support member for supporting the second heat exchanger 32.

[0051] (Layout Relationship According to Second Embodiment) 8B is an explanatory diagram of the positional relationship when the first heat exchanger and the second heat exchanger according to the second embodiment are viewed from the air flow direction. In the refrigeration device 10 according to the second embodiment, the first heat exchanger 31 and the second heat exchanger 32 may be configured such that, when viewed from the air flow direction F, the area Sa4 of the fourth region A4 defined by the outline of the second heat exchanger 32 is smaller than the area Sa3 of the third region A3 defined by the outline of the first heat exchanger 31 (Sa3>Sa4), and the fourth region A4 is included in the third region A3.

[0052] 8B, when the two heat exchangers 31 and 32 have different external dimensions, the first heat exchanger 31, which has the larger external dimension, can be easily supported by using the housing 60 that houses the first heat exchanger 31. On the other hand, it is difficult to support the second heat exchanger 32, which has the smaller external dimension, by using the housing 60, and it becomes necessary to provide a support member for supporting the second heat exchanger 32 separately from the support member for the first heat exchanger 31.

[0053] In the refrigeration device 10 of this embodiment, the second heat exchanger 32 is disposed on the downwind side of the first heat exchanger 31 in the air flow direction F, so that the second heat exchanger 32 can be supported using a support member 70 (see FIGS. 2 and 3) for supporting the fan 15. Therefore, in the refrigeration device 10 of this embodiment, even if the outer dimensions of the second heat exchanger 32 are smaller than the outer dimensions of the first heat exchanger 31 when viewed from the air flow direction F and the second heat exchanger 32 is configured to fit inside the outer dimensions of the first heat exchanger 31, the second heat exchanger 32 can be supported by the support member 70 without providing a separate support member for supporting the second heat exchanger 32.

[0054] [Effects of the embodiment] (1) The refrigeration device 10 of the above embodiment includes a first refrigerant circuit RC1 including a first compressor 21, a first heat exchanger 31, a first expansion valve 41, and a utilization side heat exchanger 34 and using a first refrigerant R1, a second refrigerant circuit RC2 including a second compressor 22, a second heat exchanger 32, and a second expansion valve 42 and using a second refrigerant R2, a third heat exchanger 33 exchanging heat between the first refrigerant R1 and the second refrigerant R2, and a fan 15. In the refrigeration device 10, the heat transfer tube constituting the first heat exchanger 31 is a circular tube 31a, and the heat transfer tube constituting the second heat exchanger 32 is a flat multi-hole tube 32a. In the refrigeration device 10, the second heat exchanger 32 is disposed on the leeward side of the first heat exchanger 31 in the flow direction F of the air generated by the fan 15.

[0055] The refrigeration device 10 of the above embodiment includes a first heat exchanger 31 using a circular tube 31a as a heat transfer tube, and a second heat exchanger 32 using a flat multi-hole tube 32a as a heat transfer tube. The flat multi-hole tube 32a is weaker against external forces than the circular tube 31a. In the refrigeration device 10 of the above embodiment, the first heat exchanger 31 is disposed on the windward side in the air flow direction F than the second heat exchanger 32, so that the first heat exchanger 31 is disposed outside the second heat exchanger 32 in the heat source side unit 11. In the refrigeration device 10 of the above embodiment, the first heat exchanger 31 using the circular tube 31a is disposed on the windward side in the air flow direction F than the second heat exchanger 32 using the flat multi-hole tube 32a, so that when an external force acts on the heat source side unit 11 including the first heat exchanger 31 and the second heat exchanger 32, the risk of the second heat exchanger 32 including the flat multi-hole tube 32a being damaged, which is weak against external forces, can be suppressed.

[0056] (2) In the refrigeration device 10 of the above embodiment, the second heat exchanger 32 is configured by a heat exchanger (a so-called parallel flow type heat exchanger) including a plurality of flat multi-hole tubes 32a and serpentine fins 32b arranged between adjacent flat multi-hole tubes 32a·32a.

[0057] In the second heat exchanger 32 of the above embodiment, the flat multi-hole tube 32a and the fins 32b are flush with each other, so the flat multi-hole tube 32a is not protected by the fins 32b. Therefore, in the second heat exchanger 32 of the above configuration, an external force is likely to be directly applied to the flat multi-hole tube 32a, which makes the flat multi-hole tube 32a prone to damage. In the refrigeration device 10 of the above embodiment, when the second heat exchanger 32 is configured as a parallel-flow type heat exchanger, the risk of the flat multi-hole tube 32a being damaged can be reduced. In the refrigeration device 10 of the above embodiment, the second heat exchanger 32 is configured as a parallel-flow type heat exchanger, so that the amount of the second refrigerant R2 used can be reduced.

[0058] (3) In the refrigeration device 10 of the above embodiment, the fan 15 is disposed on the downwind side of the second heat exchanger 32 in the air flow direction F, and the second heat exchanger 32 is fixed to the support member 70 that supports the fan 15.

[0059] In this manner, in the refrigeration device 10 of the above embodiment, the second heat exchanger 32 can be fixed by utilizing the support member 70 for fixing the fan 15.

[0060] (4) In the above embodiment of the refrigeration device 10, the first heat exchanger 31 has a first area A1 that overlaps with the second heat exchanger 32 when viewed from the air flow direction F, and a second area A2 that does not overlap with the second heat exchanger 32 (see Figure 8A).

[0061] In a configuration including the first heat exchanger 31 and the second heat exchanger 32, if the heat exchangers 31 and 32 have the same outer dimensions and are in the same outer positions when viewed from the air flow direction F, the two heat exchangers 31 and 32 can be easily supported by using a common support member. On the other hand, as shown in FIG. 8A, if the heat exchangers 31 and 32 have different outer dimensions and are offset from each other when viewed from the air flow direction F, it is difficult to support the two heat exchangers 31 and 32 using a common support member. In the refrigeration device 10 of the above embodiment, even if the first heat exchanger 31 has a first area A1 that overlaps with the second heat exchanger 32 and a second area A2 that does not overlap with the second heat exchanger 32 when viewed from the air flow direction F, the second heat exchanger 32 can be fixed by using the support member 70 for fixing the fan 15.

[0062] (5) In the refrigeration device 10 of the above embodiment, when viewed from the air flow direction F, the area Sa4 of the fourth area A4 defined by the outline of the second heat exchanger 32 is smaller than the area Sa3 of the third area A3 defined by the outline of the first heat exchanger 31, and the fourth area A4 is included in the third area A3 (see Figure 8B).

[0063] In a configuration including the first heat exchanger 31 and the second heat exchanger 32, when the heat exchangers 31 and 32 have the same outer dimensions, the two heat exchangers 31 and 32 can be easily supported by using a common support member. On the other hand, when the heat exchangers 31 and 32 have different outer dimensions as shown in FIG. 8B, the larger first heat exchanger 31 can be easily supported by using the housing 60 that houses the first heat exchanger 31, but it is difficult to support the smaller second heat exchanger 32 by using the housing 60. In the refrigeration device 10 of the above embodiment, even if the outer dimensions of the second heat exchanger 32 are smaller than the outer dimensions of the first heat exchanger 31 when viewed from the air flow direction F and the second heat exchanger 32 fits inside the outer dimensions of the first heat exchanger 31, the second heat exchanger 32 can be fixed by using the support member 70 for fixing the fan 15.

[0064] Although the embodiments 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. [Explanation of symbols]

[0065] 10: Refrigeration equipment 15: Fan 21: First compressor 22: Second compressor 31: 1st heat exchanger 31a: Circular tube 32:Second heat exchanger 32a: Flat multi-hole pipe 32b: Finn 33:Third heat exchanger 34: User side heat exchanger 41: First expansion valve 42: Second expansion valve 70: Support member R1: First refrigerant R2:Second refrigerant RC1: 1st refrigerant circuit RC2: Second refrigerant circuit F: Air flow direction

Claims

1. a first refrigerant circuit (RC1) including a first compressor (21), a first heat exchanger (31), a first expansion valve (41), and a utilization side heat exchanger (34) and using a first refrigerant (R1); a second refrigerant circuit (RC2) including a second compressor (22), a second heat exchanger (32), and a second expansion valve (42) and using a second refrigerant (R2); a third heat exchanger (33) for exchanging heat between the first refrigerant (R1) and the second refrigerant (R2); With a fan (15), Equipped with The heat transfer tube constituting the first heat exchanger (31) is a circular tube (31a), The heat transfer tube constituting the second heat exchanger (32) is a flat multi-hole tube (32a), The refrigeration device (10), wherein the second heat exchanger (32) is disposed on the downwind side of the first heat exchanger (31) in a flow direction (F) of air generated by the fan (15).

2. The second heat exchanger (32) 2. The refrigeration system (10) of claim 1, comprising a heat exchanger including a plurality of said flat multi-hole tubes (32a) and serpentine fins (32b) disposed between adjacent said flat multi-hole tubes (32a).

3. The fan (15) is disposed on the leeward side of the second heat exchanger (32) in the air flow direction (F), 3. The refrigeration system (10) of claim 1 or claim 2, wherein the second heat exchanger (32) is fixed to a support member (70) that supports the fan (15).

4. The refrigeration device (10) of claim 3, wherein the first heat exchanger (31) has a first region (A1) that overlaps with the second heat exchanger (32) when viewed from the air flow direction (F), and a second region (A2) that does not overlap with the second heat exchanger (32) when viewed from the air flow direction (F).

5. 4. The refrigeration device (10) of claim 3, wherein, when viewed from the air flow direction (F), an area (Sa4) of a fourth region (A4) defined by the contour of the second heat exchanger (32) is smaller than an area (Sa3) of a third region (A3) defined by the contour of the first heat exchanger (31), and the fourth region (A4) is included in the third region (A3).

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