JP7125638B1 - outdoor unit of refrigeration equipment - Google Patents

Abstract

An outdoor unit of a refrigeration system capable of cooling an electrical component unit is provided. A first cooling circuit (31) having a first cooling part (34) in thermal contact with the outdoor control unit (50) and through which a refrigerant flows; The outdoor unit casing 11 has an opening 16a and accommodates the outdoor control unit 50 and the first cooling circuit 31. The outdoor control unit 50 connects the first cooling portion 34 of the first cooling circuit 31 and the opening 16a. located between [Selection drawing] Fig. 3

Description

The present invention relates to an outdoor unit of a refrigeration system.

2. Description of the Related Art Conventionally, as an outdoor unit in a refrigeration system such as an air conditioner, there has been used an outdoor unit that includes components that form a refrigerant circuit such as a compressor and a heat exchanger, and an electrical component unit that controls various components. there is

For example, according to Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-99578), in order to cool heat-generating components included in the electrical component unit, part of the refrigerant pipe in the refrigerant circuit is arranged on one side of the electrical component unit. , it has been proposed to cool heat-generating components using the cold energy of a refrigerant.

In Patent Literature 1 described above, only one side surface of the electrical component unit is cooled by the refrigerant pipe. Therefore, if an attempt is made to secure a large cooling surface for the electrical component unit, the dimension of the electrical component unit in the front-rear direction may become large.

An outdoor unit of a refrigeration system according to a first aspect includes an electrical component unit having electrical components, refrigerant pipes, and a casing. A coolant flows through the coolant pipe. The refrigerant pipe has a cooling portion in thermal contact with the electrical component unit. The casing has a maintenance opening. The casing accommodates the electrical component unit and refrigerant piping. The electrical component unit is located between the cooling portion of the refrigerant pipe and the maintenance opening.

In the outdoor unit of this refrigeration system, maintenance work is facilitated for the portion of the electrical equipment unit that faces the maintenance opening. In addition, the electrical component unit cools the cooling location on the side opposite to the maintenance opening side with respect to the electrical component unit. Therefore, it is possible to cool the electrical component unit without securing a large area other than the cooling area.

An outdoor unit of a refrigerating apparatus according to a second aspect is the outdoor unit of a refrigerating apparatus according to the first aspect, wherein the electrical component unit has a sealed container in which the electrical component is accommodated. A cooling portion of the refrigerant pipe is in thermal contact with the sealed container.

In the outdoor unit of this refrigeration system, it becomes possible to efficiently cool the electrical components.

In the outdoor unit of the refrigerating apparatus according to the third aspect, in the outdoor unit of the refrigerating apparatus according to the second aspect, the sealing degree of the sealed container satisfies IP55 of the protection class defined in JIS C 0920.

In the outdoor unit of this refrigeration system, it is possible to cool the electrical components while suppressing the entry of dust into the electrical component unit.

An outdoor unit of a refrigeration apparatus according to a fourth aspect is the outdoor unit of a refrigeration apparatus according to the second aspect or the third aspect, wherein the cooling portion of the refrigerant pipe is positioned above the sealed container and is positioned above the sealed container. in thermal contact.

In the outdoor unit of this refrigeration system, since the cooled air descends in the internal space of the sealed container, it is possible to generate an air flow for cooling.

A refrigerating apparatus outdoor unit according to a fifth aspect is the outdoor unit of a refrigerating apparatus according to any one of the second aspect to the fourth aspect, wherein the sealed container and the cooling portion of the refrigerant pipe are located on the maintenance opening side of the sealed container. are in thermal contact with each other on the opposite cooling surface. The electrical components are provided inside the sealed container at a position away from the cooling surface.

In the outdoor unit of this refrigeration system, even if condensed water occurs due to cooling on the cooling surface of the sealed container, the condensed water is suppressed from reaching the electrical components.

An outdoor unit of a refrigerating apparatus according to a sixth aspect is the outdoor unit of a refrigerating apparatus according to any one of the second to fifth aspects, wherein the sealed container has a first surface, a second surface, and a side surface. have. The first surface is positioned on the maintenance opening side. The second surface is located on the side opposite to the maintenance opening side with respect to the first surface. The side surface connects the first surface and the second surface. The second surface is wider than the side surface.

In the outdoor unit of this refrigeration system, even if the side surface is not large, it is possible to cool the electrical components through the second surface.

A refrigerating apparatus outdoor unit according to a seventh aspect is the refrigerating apparatus outdoor unit according to any one of the first aspect to the sixth aspect, further comprising a heat transfer member. The heat transfer member is positioned between the electrical component unit and the cooling portion of the refrigerant pipe.

In the outdoor unit of this refrigeration system, cold heat from the cooling portion of the refrigerant pipe can be easily transferred to the electrical components.

An outdoor unit of a refrigerating apparatus according to an eighth aspect is the outdoor unit of a refrigerating apparatus according to the seventh aspect, further comprising fixing means. The fixing means presses and fixes the heat transfer member against the electrical component unit.

In the outdoor unit of this refrigeration system, it is possible to improve the cooling efficiency by improving the contact state between the heat transfer member and the electrical component unit.

A refrigerating apparatus outdoor unit according to a ninth aspect is the refrigerating apparatus outdoor unit according to the eighth aspect, further comprising a spacer. A spacer is located between the fixing means and the heat transfer member. A cooling portion of the refrigerant pipe is positioned between the electrical component unit and the fixing means. The fixing means presses the heat transfer member against the electrical component unit via the spacer.

In the outdoor unit of this refrigeration system, it is possible to improve the contact state between the heat transfer member and the electrical component unit with a simple structure.

A refrigerating apparatus outdoor unit according to a tenth aspect is the refrigerating apparatus outdoor unit according to the eighth aspect or the ninth aspect, wherein the fixing means has a first portion and a second portion. The first portion is located on the opposite side of the heat transfer member from the electrical component unit side. The second portion is connected to the first portion and extends laterally of the electrical component unit toward the maintenance opening side. The fixing means presses the heat transfer member against the electrical component unit by the first portion by pulling the second portion toward the maintenance opening side.

The first part and the second part may be one integrally molded part, or may be separate parts.

In the outdoor unit of this refrigeration system, it is possible to carry out the work of bringing the heat transfer member into sufficient contact with the electrical component unit from the maintenance opening side.

1 is an overall configuration diagram of a refrigeration system according to one embodiment; FIG. It is an external appearance perspective view of an outdoor unit. Fig. 3 is a schematic external perspective view showing the arrangement of an outdoor control section in the outdoor unit; FIG. 5 is a schematic external perspective view showing a state in which the second cooling portion is moved; FIG. 3 is a plan view schematic configuration diagram of the interior of the outdoor control unit. FIG. 4 is a front view schematic configuration diagram of the front side portion inside the outdoor control unit. FIG. 4 is a rear view schematic configuration diagram of the rear side portion inside the outdoor control unit. It is a right side view outline block diagram inside an outdoor control part. 1 is a schematic external perspective view of a sealing material for wiring; FIG. FIG. 10 is a schematic plan view configuration diagram of the periphery of the outdoor control unit in a state where the second cooling portion is rotated forward. FIG. 4 is a schematic plan view showing how the outdoor control unit is removed forward.

(1) Configuration of Refrigerating Device FIG. 1 shows a schematic configuration diagram of a refrigerating device 1 .

A refrigerating device 1 is a device used for cooling and heating a room such as a building by performing a vapor compression refrigerating cycle operation. The refrigerating apparatus 1 mainly includes an outdoor unit 2 , an indoor unit 4 , and a liquid-side refrigerant communication pipe 6 and a gas-side refrigerant communication pipe 5 that connect the outdoor unit 2 and the indoor unit 4 . A refrigerant circuit 10 of the refrigerating apparatus 1 is configured by connecting an outdoor unit 2, an indoor unit 4, a liquid-side refrigerant communication pipe 6, and a gas-side refrigerant communication pipe 5 to each other.

The refrigerant circuit 10 of the present embodiment is filled with any refrigerant such as R410A or R32.

(1-1) Indoor Unit The indoor unit 4 is installed in the ceiling of a building or the like by embedding or hanging it, or by hanging it on the wall surface of the room. The indoor unit 4 is connected to the outdoor unit 2 via a liquid-side refrigerant communication pipe 6 and a gas-side refrigerant communication pipe 5, and constitutes part of a refrigerant circuit 10. As shown in FIG.

Note that the refrigerating apparatus 1 of the present embodiment has a plurality of indoor units 4 that are connected in parallel with each other in the refrigerant circuit 10 . Since each indoor unit 4 has the same configuration, one indoor unit 4 will be described below.

The indoor unit 4 mainly has an indoor expansion valve 44 , an indoor heat exchanger 41 , an indoor fan 42 and an indoor controller 46 .

The indoor heat exchanger 41 is, for example, a cross-fin type fin-and-tube heat exchanger composed of heat transfer tubes and a large number of fins. The indoor heat exchanger 41 functions as a refrigerant evaporator to cool indoor air during cooling operation, and functions as a refrigerant radiator or condenser to warm indoor air during heating operation. A gas side refrigerant communication pipe 5 is connected to the gas side of the indoor heat exchanger 41 .

The indoor expansion valve 44 is composed of an electronic expansion valve whose opening degree can be adjusted. The indoor expansion valve 44 is provided in the refrigerant channel between the indoor heat exchanger 41 and the liquid side refrigerant communication pipe 6 .

The indoor unit 4 has an indoor fan 42 for drawing indoor air into the unit, exchanging heat with the refrigerant in the indoor heat exchanger 41, and then supplying the air indoors as supply air. The indoor fan 42 is a centrifugal fan, a multi-blade fan, or the like. The indoor fan 42 has an indoor fan motor 43 .

The indoor control section 46 controls the operation of each section that constitutes the indoor unit 4 . The indoor control section 46 has a microcomputer, a memory, and the like provided for controlling the indoor unit 4 . The indoor controller 46 can exchange control signals and the like with the outdoor controller 50 of the outdoor unit 2 or the remote controller 3 via the transmission line 7a.

(1-2) Outdoor Unit The outdoor unit 2 is installed outdoors in a building or the like, and is connected to each indoor unit 4 via a liquid-side refrigerant communication pipe 6 and a gas-side refrigerant communication pipe 5 .

FIG. 2 shows an external perspective view of the outdoor unit 2. As shown in FIG. In FIG. 2, a part of the internal configuration of the outdoor unit 2 is omitted. In the following description, "upper", "lower", "left", "right", "front", and "rear" refer to the front of the outdoor unit 2 shown in FIG. left oblique front side). Here, in the present embodiment, the direction in which the surface on which the outdoor heat exchanger 23 does not exist or the surface on which the outdoor heat exchanger 23 exists is the smallest, when viewed from the center of the outdoor unit 2 in plan view, is defined as "front". 2 mainly shows the main equipment inside the outdoor unit 2 and the outdoor controller 50, and the outdoor heat exchanger 23 and other piping are omitted. 3 shows a schematic external perspective view showing the arrangement of the outdoor control section 50 in the outdoor unit 2, etc. As shown in FIG. 3 mainly shows the outdoor control unit 50, the first cooling portion 34 and the second cooling portion 38 around it, the outdoor heat exchanger 23, the outdoor fan 26, etc., and other devices and pipes are omitted. there is

The outdoor unit 2 mainly includes an outdoor unit casing 11, a compressor 21, a four-way switching valve 22, an outdoor heat exchanger 23, an outdoor expansion valve 24, an accumulator 25, a liquid side shutoff valve 29, a gas side shutoff valve 28, and a cooling circuit. 30, an outdoor fan 26, an outdoor controller 50, and the like.

In this embodiment, the outdoor unit 2 is a top-blown heat exchange unit that draws in air from the left and right side surfaces and the rear surface of the outdoor unit casing 11 and blows the air upward from the upper end surface of the outdoor unit casing 11.

The outdoor unit casing 11 mainly has a main portion 13 and a fan module 12 provided on the main portion 13 .

The main part 13 has a pair of mounting legs 18, a bottom frame 15, four posts 14, a front panel 13a, and mesh parts 13b, 13c, 13d. The installation leg 18 has one provided on the front side and one provided on the rear side, each of which extends in the left-right direction. The bottom frame 15 spans over each mounting leg 18 . Each strut 14 extends vertically from a corner of the bottom frame 15 . The front panel 13a extends between the two stanchions 14 on the front side. The mesh portion 13b is provided so as to spread in the front-rear direction between the columns 14 on the left side. The mesh portion 13c is provided so as to spread left and right between the support columns 14 on the rear side. The mesh portion 13d is provided so as to spread forward and backward between the right support columns 14. As shown in FIG.

The bottom frame 15 forms the bottom surface of the outdoor unit casing 11 , and the outdoor heat exchanger 23 is provided on the bottom frame 15 . Here, the outdoor heat exchanger 23 is a substantially U-shaped heat exchanger that faces the rear surface and both left and right side surfaces of the outdoor unit casing 11 in plan view.

The net portions 13b, 13c, and 13d are provided so as to extend along the outer surface of the outdoor heat exchanger 23. As shown in FIG. These mesh portions 13b, 13c, and 13d substantially form three suction ports on the right side, the left side, and the back of the outdoor unit casing 11. As shown in FIG.

The front panel 13 a has an upper front panel 16 forming an upper portion of the front surface of the outdoor unit casing 11 and a lower front panel 17 forming a lower portion of the front surface of the outdoor unit casing 11 .

A fan module 12 is attached to the top of each strut 14 . The fan module 12 is a substantially rectangular parallelepiped box having a front plate 12a, a left plate 12b, a back plate 12c, and a right plate 12d. The fan module 12 accommodates the outdoor fan 26 therein to form a flow path for an upward air flow.

The compressor 21 is, for example, a positive displacement compressor driven by a compressor motor 21a. In this embodiment, two compressors 21 are connected in parallel. The compressor motor 21a is driven by being supplied with power through an inverter device. The compressor 21 has a variable operating capacity by changing the driving frequency of the compressor motor 21a to change the number of revolutions. A discharge side of the compressor 21 is connected to one of a plurality of connection ports in the four-way switching valve 22 . The compressor 21 is mounted on the bottom frame 15 in this embodiment.

The accumulator 25 is a refrigerant container provided between the suction side of the compressor 21 and one of the plurality of connection ports of the four-way switching valve 22 . The accumulator 25 is mounted on the bottom frame 15 in this embodiment.

The outdoor heat exchanger 23 is, for example, a cross-fin type fin-and-tube heat exchanger composed of heat transfer tubes and a large number of fins. The outdoor heat exchanger 23 functions as a refrigerant radiator or condenser during cooling operation, and functions as a refrigerant evaporator during heating operation. One of the plurality of connection ports of the four-way switching valve 22 is connected to the gas side of the outdoor heat exchanger 23 via refrigerant piping. An outdoor expansion valve 24 is connected to the liquid side of the outdoor heat exchanger 23 via a refrigerant pipe.

The outdoor fan 26 is housed within the fan module 12 . The outdoor fan 26 draws in outdoor air from the periphery of the lower portion of the outdoor unit casing 11 to exchange heat with the refrigerant in the outdoor heat exchanger 23, and then blows the air from the outlet provided on the upper end surface of the fan module 12. Creates an air flow that discharges upwards. The outdoor fan 26 is a propeller fan or the like driven by an outdoor fan motor 26a consisting of a DC fan motor, and has a variable air volume. In this embodiment, the outdoor fan motor 26a is driven by being supplied with power through an inverter device.

The outdoor expansion valve 24 is an electric expansion valve whose opening degree can be adjusted in order to adjust the flow rate of the refrigerant flowing through the refrigerant circuit 10 . The outdoor expansion valve 24 is provided between the liquid side outlet of the outdoor heat exchanger 23 and the liquid side closing valve 29 .

The four-way switching valve 22 has a plurality of connection ports. The four-way switching valve 22 switches the connection state of the plurality of connection ports to switch the refrigerant circuit 10 between the cooling operation connection state and the heating operation connection state. In the cooling operation connection state, the discharge side of the compressor 21 and the outdoor heat exchanger 23 are connected, and the suction side of the compressor 21 and the gas side stop valve 28 are connected. In the heating operation connection state, the discharge side of the compressor 21 and the gas side shutoff valve 28 are connected, and the suction side of the compressor 21 and the outdoor heat exchanger 23 are connected.

The liquid-side closing valve 29 is a valve provided at a connection port with the liquid-side refrigerant communication pipe 6 . The liquid side stop valve 29 is connected to the side of the outdoor expansion valve 24 opposite to the side of the outdoor heat exchanger 23 via a refrigerant pipe. The gas side shutoff valve 28 is a valve provided at a connection port with the gas side refrigerant communication pipe 5 . The gas side shutoff valve 28 is connected to one of the plurality of connection ports of the four-way switching valve 22 via refrigerant piping.

The cooling circuit 30 is a circuit for cooling electrical components such as heat-generating components, which will be described later, of the outdoor control unit 50, and includes a first cooling circuit 31 and a second cooling circuit 35. there is

The first cooling circuit 31 branches from between the discharge side of the compressor 21 and one of the plurality of connection ports of the four-way switching valve 22 , and connects one of the plurality of connection ports of the four-way switching valve 22 and the accumulator 25 . It is a circuit that flows the refrigerant so as to join between The first cooling circuit 31 has a first heat exchanger 32 , a first expansion valve 33 and a first cooling section 34 . The first heat exchanger 32 , the first expansion valve 33 , and the first cooling portion 34 are provided so that the refrigerant flows in this order in the first cooling circuit 31 . In this embodiment, the first heat exchanger 32 is integrated with the outdoor heat exchanger 23 and a second heat exchanger 36 described later by sharing heat transfer fins. The first expansion valve 33 is an electric expansion valve whose opening degree can be adjusted in order to adjust the flow rate of the refrigerant flowing through the first cooling circuit 31 . The first cooling portion 34 is provided so as to cool a space in which electric components such as heat-generating components of the outdoor control unit 50 are accommodated from the back side of the outdoor control unit 50 via a first heat transfer member 34a, which will be described later. It is

The second cooling circuit 35 branches from between the discharge side of the compressor 21 and one of the plurality of connection ports of the four-way switching valve 22 , and is connected to one of the plurality of connection ports of the four-way switching valve 22 and the accumulator 25 . It is a circuit that flows the refrigerant so as to join between The second cooling circuit 35 has a second heat exchanger 36 , a second cooling section 38 and a second expansion valve 37 . The second heat exchanger 36, the second cooling portion 38, and the second expansion valve 37 are provided so that the refrigerant flows in this order in the second cooling circuit 35. As shown in FIG. In this embodiment, the second heat exchanger 36 is integrated with the outdoor heat exchanger 23 and the first heat exchanger 32 by sharing heat transfer fins. The second expansion valve 37 is an electric expansion valve whose opening degree can be adjusted in order to adjust the flow rate of the refrigerant flowing through the second cooling circuit 35 . The second cooling portion 38 is provided so as to be in thermal contact with electric components such as heat-generating components of the outdoor control section 50 from the front side via a second heat transfer member 38a, which will be described later, so as to cool them.

Although details will be described later, when constructing the outdoor unit 2 or when performing maintenance of the outdoor control unit 50 of the outdoor unit 2, etc., as shown in FIG. move forward. Specifically, the first connection pipe 39a and the second connection pipe 39b extending from both ends of the second cooling portion 38 are rotated so as to be twisted, so that the second cooling portion 38 is turned forward, and the outdoor control is performed. Construction and maintenance of the part 50 and the like are performed.

Further, the outdoor unit 2 is provided with various sensors (not shown).

The outdoor control unit 50 is provided in the outdoor unit casing 11 below the fan module 12 and near the front side so as to face the rear side of the upper front panel 16 . More specifically, the outdoor control unit 50 is positioned forward of the compressor 21 and the accumulator 25 . An on-site worker can access the outdoor control unit 50 through an opening 16 a that appears by removing the upper front panel 16 of the outdoor unit casing 11 . The opening 16a is bordered by the left front support 14, the right front support 14, the lower edge of the front side plate 12a of the fan module 12, and the upper edge of the lower front panel 17. open in the direction The outdoor control section 50 controls the operation of each section that configures the outdoor unit 2 . The outdoor control unit 50 has a microcomputer and memory provided for controlling the outdoor unit 2, and includes a compressor motor 21a, an outdoor fan motor 26a, an outdoor expansion valve 24, a four-way switching valve 22, It controls the states of the first expansion valve 33, the second expansion valve 37, and the like. The outdoor controller 50 can exchange control signals and the like with the indoor controller 46 of each indoor unit 4 and the remote control 3 via the transmission line 7a. The indoor control unit 46, the outdoor control unit 50, and the remote controller 3 described above are connected to each other via a transmission line 7a to form a control unit 7 that controls the operation of the entire refrigeration apparatus 1. FIG.

The control unit 7 is connected so as to receive detection signals from various sensors (not shown), and controls various devices based on these detection signals. Note that the control unit 7 has a CPU that executes the various controls described above, and a memory or the like that stores information used for executing the various controls.

(1-3) Refrigerant Communication Pipe The liquid-side refrigerant communication pipe 6 and the gas-side refrigerant communication pipe 5 are refrigerant pipes that are installed on-site when the refrigeration system 1 is installed in a building or the like.

In the refrigeration apparatus 1 of this embodiment having a plurality of indoor units 4, the liquid-side refrigerant communication pipe 6 has a branched portion corresponding to each indoor unit, and the gas-side refrigerant communication pipe 5 is It has a branched portion corresponding to each indoor unit.

(2) Refrigeration Cycle in Refrigerant Circuit In the refrigerant circuit 10 of the refrigeration system 1, by switching the connection state of the four-way switching valve 22, cooling operation and heating operation are mainly performed. Here, operation of portions of the refrigerant circuit 10 other than the cooling circuit 30 will be described.

(2-1) Cooling operation In the cooling operation, the four-way switching valve 22 is connected so that the discharge side of the compressor 21 is on the side of the outdoor heat exchanger 23 and the suction side of the compressor 21 is on the side of each indoor heat exchanger 41. It is done with the state switched.

The frequency of the compressor 21 is controlled, for example, so as to process the cooling load in each indoor unit 4 . As a result, the low-pressure refrigerant sucked into the compressor 21 is discharged from the compressor 21 to become a high-pressure refrigerant, and flows into the outdoor heat exchanger 23 via the four-way switching valve 22 .

The refrigerant that has flowed into the outdoor heat exchanger 23 radiates the heat of the refrigerant and condenses. The refrigerant that has flowed out of the outdoor heat exchanger 23 passes through the outdoor expansion valve 24 that is controlled to be fully open by the controller 7 during cooling operation.

The refrigerant that has passed through the outdoor expansion valve 24 passes through the liquid side closing valve 29 and is sent to the liquid side refrigerant communication pipe 6 .

The refrigerant flowing through the liquid-side refrigerant communication pipe 6 is sent to each indoor unit 4 after being branched.

The refrigerant that has flowed into each indoor unit 4 is decompressed by the indoor expansion valve 44 to the low pressure of the refrigeration cycle. The degree of opening of the indoor expansion valve 44 is controlled by the control unit 7, for example, so that the degree of superheat of the refrigerant on the outlet side of the indoor heat exchanger 41 reaches a predetermined target degree of superheat.

The refrigerant decompressed by each indoor expansion valve 44 of each indoor unit 4 evaporates in each indoor heat exchanger 41 . The refrigerant evaporated in each indoor heat exchanger 41 merges and flows through the gas-side refrigerant communication pipe 5 .

The refrigerant that has flowed through the gas-side refrigerant communication pipe 5 is sucked into the compressor 21 again through the gas-side shutoff valve 28 , the four-way switching valve 22 and the accumulator 25 of the outdoor unit 2 .

(2-2) Heating operation In heating operation, the four-way switching valve 22 is connected so that the discharge side of the compressor 21 is on the side of each indoor heat exchanger 41 and the suction side of the compressor 21 is on the side of the outdoor heat exchanger 23. It is done with the state switched.

The frequency of the compressor 21 is controlled so that, for example, the heating load in each indoor unit can be processed. As a result, the high-pressure refrigerant discharged from the compressor 21 flows toward each indoor unit 4 via the four-way switching valve 22 and the gas-side refrigerant communication pipe 5 .

Here, the refrigerant that has passed through the gas side refrigerant communication pipe 5 branches and flows into each indoor unit 4 .

The refrigerant that has flowed into each indoor unit 4 radiates heat and condenses in each indoor heat exchanger 41 . The degree of opening of each indoor expansion valve 44 is controlled during heating operation so that, for example, the degree of supercooling of the refrigerant flowing through the outlet of the indoor heat exchanger 41 becomes a predetermined value.

In this way, the refrigerant condensed in each indoor heat exchanger 41 and passed through each indoor expansion valve 44 merges and flows through the liquid-side refrigerant communication pipe 6 .

The refrigerant that has flowed through the liquid-side refrigerant communication pipe 6 is supplied to the outdoor unit 2 through the liquid-side shutoff valve 29 . The refrigerant that has passed through the liquid side stop valve 29 is decompressed to the low pressure of the refrigeration cycle at the outdoor expansion valve 24 . Specifically, for example, the degree of opening of the outdoor expansion valve 24 is controlled such that the degree of superheat of the refrigerant flowing on the suction side of the compressor 21 reaches the target degree of superheat.

The refrigerant sent to the outdoor heat exchanger 23 evaporates and is sucked into the compressor 21 again via the four-way switching valve 22 and the accumulator 25 .

(3) Refrigerant Flow in Cooling Circuit Here, the operation in the cooling circuit 30 of the refrigerant circuit 10 will be described.

Refrigerant can flow through the first cooling circuit 31 and the second cooling circuit 35 of the cooling circuit 30 both during the cooling operation and during the heating operation. During both the cooling operation and the heating operation, more specifically, when the compressor 21 is being driven, the outdoor control unit causes the refrigerant to flow through the first cooling circuit 31 and the second cooling circuit 35 at all times. 50 may control the opening degrees of the first expansion valve 33 and the second expansion valve 37 .

Refrigerant discharged from the compressor 21 and decompressed by the first expansion valve 33 after the heat is radiated by the first heat exchanger 32 is led to the first cooling portion 34 of the first cooling circuit 31 . At least a portion of the refrigerant flowing through the first cooling portion 34 is evaporated by receiving heat from the heat-generating components of the outdoor control section 50 and flows toward the accumulator 25 .

In addition, the refrigerant discharged from the compressor 21 and after heat dissipation in the second heat exchanger 36 is guided to the second cooling portion 38 of the second cooling circuit 35 . The refrigerant flowing through the second cooling portion 38 is at least partially evaporated by receiving heat from the heat-generating components of the outdoor control section 50 , depressurized when passing through the second expansion valve 37 , and flows toward the accumulator 25 .

Therefore, the temperature of the coolant flowing through the first cooling portion 34 and the temperature of the coolant flowing through the second cooling portion 38 are different, and the temperature of the coolant flowing through the first cooling portion 34 is lower.

Incidentally, in the present embodiment, the pipe portions forming the first cooling circuit 31 and the second cooling circuit 35 are made of copper pipe. In this embodiment, the material and the diameter of the pipes constituting the first cooling circuit 31 and the second cooling circuit 35 are uniform. The pipe diameters of the pipe portions that constitute the first cooling circuit 31 and the second cooling circuit 35 are smaller than the pipe diameters of the main pipe portions in the refrigerant circuit 10. For example, the nominal pipe diameter is 1/2 inch or less (the outer diameter is 12 .7 mm or less), preferably the nominal pipe diameter is 3/8 inch or less (outer diameter is 9.52 mm or less), and the nominal pipe diameter is 1/4 inch or less (outer diameter is 6.35 mm or less) ) is more preferred. Here, the main pipe portion of the refrigerant circuit 10 can be a pipe connected to the outdoor heat exchanger 23, for example.

(4) Detailed Configuration of Outdoor Control Unit FIG. 5 shows a schematic plan view of the interior of the outdoor control unit 50 . FIG. 6 shows a schematic front view configuration diagram of the front side portion inside the outdoor control unit 50. As shown in FIG. FIG. 7 shows a schematic rear view configuration diagram of the rear side portion inside the outdoor control unit 50. As shown in FIG. FIG. 8 shows a schematic configuration diagram of the inside of the outdoor control unit 50 as seen from the right side.

The outdoor control unit 50 has an electrical component casing 50 a , a first board 61 , a second board 62 , a third board 63 , a fourth board 64 and a fifth board 65 .

The electrical component casing 50a includes a back surface 57, a top surface 55, a bottom surface 56, a right side surface 54, a left side surface 53, an upper front cover 51, a lower front cover 52, a second partition plate 58, a first It has a partition plate 59 and. The electrical component casing 50a has a substantially box-like appearance, comprising a rear surface 57, a top surface 55, a lower surface 56, a right side 54, a left side 53, an upper front cover 51, and a lower front cover 52. Of these, the back surface 57, the top surface 55, the bottom surface 56, the right side 54, the left side 53, the second partition plate 58, the first partition plate 59, the upper front lid 51, and the lower front lid 52 are made of sealing materials for lids, which will be described later. It is made of metal except for 50b. The back surface 57, top surface 55, bottom surface 56, right side surface 54, and left side surface 53 are integrally formed. When a plurality of metal plate members are integrally formed, the metal plate members are preferably connected to each other by seaming so as not to create a gap. The upper front cover 51 and the lower front cover 52 are both made of sheet metal having a substantially rectangular shape when viewed from the front, and constitute the front surface of the electrical component casing 50a. The upper front lid 51 is positioned above the lower front lid 52 . In this embodiment, the upper front cover 51 is larger than the lower front cover 52 in front view.

The upper front cover 51 has an inspection opening 51a penetrating in the plate thickness direction. The inspection opening 51a is closed by an inspection lid 51b so as to be openable and closable.

The second partition plate 58 extends vertically and horizontally so as to partition the interior of the electrical component casing 50a into a front side and a rear side. The second partition plate 58 is provided near the center in the front-rear direction inside the electrical component casing 50a. The first partition plate 59 extends horizontally so as to vertically partition the space in front of the second partition plate 58 inside the electrical component casing 50a. The first partition plate 59 is provided near the center in the vertical direction inside the electrical component casing 50a. As a result, the interior of the electrical component casing 50a is divided into a first space S1 on the rear side of the second partition plate 58 and a space S1 on the front side of the second partition plate 58 and above the first partition plate 59. It is partitioned into a second space S<b>2 and a third space S<b>3 on the front side of the second partition plate 58 and below the first partition plate 59 .

The first partition plate 59 has a first opening 59a penetrating vertically so as to communicate the second space S2 and the third space S3. The second partition plate 58 also has a second opening 58a penetrating in the front-rear direction so as to communicate the first space S1 and the second space S2. The second partition plate 58 does not have an opening that directly communicates the first space S1 and the third space S3. A wiring sealing material 90 shown in FIG. 9 is attached to the first opening 59 a of the first partition plate 59 .

The lower surface 56 has an opening 56b on the rear side of the second partition plate 58 that communicates the first space S1 with the external space below the electrical component casing 50a. An electrical wiring 63b extending from an IPM provided on a third substrate 63, which will be described later, passes through the opening 56b. A wiring sealing material 90 shown in FIG. The opening area of the opening 56b provided in the lower surface 56 is approximately the same as the opening area of the second opening 58a provided in the second partition plate 58, and the first opening 59a provided in the first partition plate 59 smaller than the opening area of

The wiring sealing material 90 has a partition portion 91, a first cylindrical portion 92, a second cylindrical portion 93, and a communicating portion 94, and is made of a flexible material such as rubber. ing. The partition part 91 has a substantially rectangular plate shape. The first cylindrical portion 92 is a cylindrical portion provided to extend from the planar portion of the partition portion 91 . The second cylindrical portion 93 is a cylindrical portion provided so as to extend from the planar portion of the partition portion 91 to the side opposite to the first cylindrical portion 92 side. The communicating portion 94 is provided at a position connecting the inner side of the first cylindrical portion 92 and the inner side of the second cylindrical portion 93 in the partition portion 91, and radially penetrates the partition portion 91 in the plate thickness direction. It has a plurality of notches provided. The wiring sealing material 90 is attached to the first partition plate 59 by fitting either the first cylindrical portion 92 or the second cylindrical portion 93 inside the first opening 59a. When viewed from the thickness direction of the first partition plate 59 , the communicating portion 94 of the sealing material 90 for wiring is positioned inside the first opening 59 a of the first partition plate 59 .

The wiring sealing material 90 shown in FIG. 9 is similarly attached to the second opening 58a of the second partition plate 58 as well. The wiring sealing material 90 is attached to the second partition plate 58 by fitting either the first cylindrical portion 92 or the second cylindrical portion 93 inside the second opening 58a. When viewed from the thickness direction of the second partition plate 58 , the communicating portion 94 of the sealing material 90 for wiring is positioned inside the second opening 58 a of the second partition plate 58 .

The upper front cover 51 is fitted to the top surface 55 , the right side surface 54 , the left side surface 53 , and the front edge portions of the first partition plate 59 . The top surface 55, the bottom surface 56, the right side surface 54, the left side surface 53, and the first partition plate 59 are provided with a lid sealing material 50b so as to border the front edges thereof. The lid sealing material 50b may be, for example, a packing made of rubber or the like provided along each front edge. The packing is preferably a U-shaped packing that sandwiches the edges. Since the lid sealing material 50b is provided in this way, when the upper front lid 51 is attached, the upper front lid 51, the top surface 55, the right side surface 54, the left side surface 53, and the first partition plate 59 are separated from each other. The gap between the front side edge of the second space S2 is filled, and it is possible to improve the airtightness of the second space S2.

The lower front lid 52 is fitted to the lower surface 56 , the right side 54 , the left side 53 , and the front side edges of the first partition plate 59 . Similarly, the lower front lid 52 is provided with the above-described lid sealing material 50b. 53 and the front edge of the first partition plate 59 are filled, and the sealing of the third space S3 can be improved.

In addition, the lower surface 56 has a movable surface 56x in the vicinity of the left end on the front side of the second partition plate 58 . The movable surface 56x has openings for vertically penetrating a first connecting pipe 39a and a second connecting pipe 39b, which are connected to respective ends of the second cooling portion 38 of the second cooling circuit 35. formed. The movable surface 56x can be separated from the lower surface 56 by sliding forward along with the first connection pipe 39a and the second connection pipe 39b.

Of the surfaces forming the outer periphery of the electrical component casing 50a, the rear surface 57 is the widest surface. The length of the back surface 57 in the left-right direction is longer than the length of the left side surface 53 in the front-rear direction and longer than the length of the right side surface 54 in the front-rear direction. Therefore, the first cooling portion 34 of the first cooling circuit 31 can secure a sufficiently long portion in the left-right direction that is in thermal contact with the rear surface 57 of the electrical component casing 50a.

Each of the first substrate 61, the second substrate 62, the third substrate 63, the fourth substrate 64, and the fifth substrate 65 is a plate-shaped member extending vertically and horizontally, and has a substantially rectangular shape when viewed from the front. , and is fixed to the second partition plate 58 . Specifically, two first substrates 61 are provided in the present embodiment, and are located separately to the left and right above the first space S1. Two third substrates 63 are provided in the present embodiment, and are located below the first space S1 so as to be divided into left and right. The second substrate 62 is positioned between the two third substrates 63 below the center of the first space S1 in the horizontal direction. The fourth substrate 64 is positioned on the upper right side of the second space S2. The fifth substrate 65 is positioned on the upper left side of the second space S2.

The first substrate 61 is provided with a noise filter 61a, which is an electrical component and a heat-generating component. The second substrate 62 is provided with an IPM (Intelligent Power Module) 62a which is an electric component used in the outdoor fan 26 and which is a heat generating component. The third substrate 63 is provided with an IPM (Intelligent Power Module) 63a which is an electrical component for the inverter of the compressor 21 and which is a heat generating component. The noise filter 61a, the IPM 62a, and the IPM 63a are all housed in the first space S1, but are positioned forward and away from the rear surface 57 of the electrical component casing 50a. As a result, even if dew condensation occurs on the back surface 57 of the first space S1 as the back surface 57 is cooled by the first cooling portion 34, the condensed water is prevented from reaching the noise filters 61a, IPM 62a, and IPM 63a. be. The first board 61, the second board 62, and the third board 63 do not require work such as setting by field workers when constructing the outdoor unit 2, and the outdoor unit 2 is shipped from the factory. used as is.

The fourth board 64 is an auxiliary control board and is provided with various electrical components 64a. The fifth board 65 is a main control board and is provided with various electrical components 65a. The refrigerating apparatus 1 of this embodiment has optional functions that can be arbitrarily selected or added according to the user's wishes. Optional functions include, but are not limited to, on-demand control. The optional function can be set in the fourth substrate 64 and the fifth substrate 65 arranged in the second space S2 in the outdoor control section 50. FIG. The setting of the optional functions in the outdoor control unit 50 is performed by a field worker accessing the fourth board 64 and the fifth board 65 and manually operating them when installing the outdoor unit 2 . Specifically, the fourth board 64 and the fifth board 65 are provided with switches or the like for setting. Access to the fifth board 65 having the electrical component 65a and the fourth board 64 having the electrical component 64a can be made by removing the upper front cover 51 . The upper front cover 51 that covers the second space S2 from the front side is provided with the inspection opening 51a closed by the inspection cover 51b as described above. Therefore, as for the fifth board 65, it is possible to carry out work such as construction and maintenance through the inspection opening 51a only by removing the inspection lid 51b without removing the entire upper front lid 51. It should be noted that the second space S2 is sealed by the upper front lid 51 or the inspection lid 51b when the initial setting at the time of construction is performed.

An electrical wiring 61 b extends from the first substrate 61 . An electric wiring 62 b extends from the second substrate 62 . An electric wiring 63 b extends from the third substrate 63 . An electric wiring 64 b extends from the fourth substrate 64 . An electric wiring 65 b extends from the fifth substrate 65 . These electrical wirings 61b, 62b, 63b, 64b, and 65b are shown only in FIGS. The electric wires 61b, 62b, 64b, 65b are connected to connection terminals of a terminal block 69 provided in the lower right part of the third space S3. The electric wiring 63b is connected to the compressor 21 after passing through the opening 56b by passing through the communicating portion 94 of the wiring sealing material 90 attached to the lower surface 56 below the first space S1.

Here, the electric wiring 64b extending from the fourth substrate 64 provided in the second space S2 and the electric wiring 65b extending from the fifth substrate 65 are provided so as to penetrate vertically near the center of the first partition plate 59. It is drawn into the third space S3 through the first opening 59a and connected to the connection terminal of the terminal block 69. As shown in FIG. More specifically, the electrical wiring 64b and the electrical wiring 65b pass through the first opening 59a by passing through the communicating portion 94 of the wiring sealing material 90 attached to the first partition plate 59 .

An electric wiring 61b extending from the first substrate 61 and an electric wiring 62b extending from the second substrate 62 provided in the first space S1 are provided so as to pass through the second partition plate 58 in the vicinity of its center. After being drawn into the second space S2 through the second opening 58a, it is drawn into the third space S3 through the first opening 59a provided in the first partition plate 59 and connected to the connection terminal of the terminal block 69. be done. More specifically, the electrical wiring 61b and the electrical wiring 62b pass through the second opening 58a by passing through the communicating portion 94 of the wiring sealing material 90 attached to the second partition plate 58, and then through the first partition plate. It passes through the first opening 59a by passing through the communicating portion 94 of the wiring sealing material 90 attached to the wiring 59 .

The connection terminals of the terminal block 69 are connected to electrical wiring extending from devices to be connected other than the compressor 21 . A portion of the lower surface 56 of the electrical component casing 50a located below the terminal block 69 in the third space S3 is provided with an opening 56a through which electrical wiring extending from equipment other than the compressor 21 is passed. . In this embodiment, the electrical wiring 63b passing through the opening 56b located below the first space S1 in the lower surface 56 is already connected to the compressor 21 when the outdoor unit 2 is shipped from the factory. The extended electrical wiring and the connection terminals of the terminal block 69 are not connected when the outdoor unit 2 is shipped from the factory, but are connected by a field worker during construction. Specifically, the operator removes the lower front cover 52 to release the third space S3, and the electrical wiring extending from the equipment other than the compressor 21 is passed through the opening 56a of the lower surface 56 to connect the terminal block 69. The terminal is connected, and the lower front cover 52 seals the third space S3. The above-described wiring sealing material 90 is attached to the opening 56a to prevent relatively large dust particles from entering the third space S3. When the lower front lid 52 is attached, the third space S3 is provided with the lid sealing material 50b. The gap between the partition plate 59 and the front edge is filled to form a space that ensures airtightness. The third space S3 is slightly connected to the space outside the electrical component casing 50a through the opening 56a to which the wiring sealing material 90 is attached. In addition, the terminal block 69 is provided in the third space S3 as described above, and the lower front cover 52 is removed in order to perform wiring connection work during construction, and is exposed to the outside. Therefore, the sealing degree of the third space S3 is the lowest among the spaces of the electrical component casing 50a. This third space S3 preferably satisfies the IP55 protection class defined in JIS C 0920 or IP55 or higher.

In addition, when the upper front cover 51 is attached to the second space S2, the upper front cover 51 is provided with the lid sealing material 50b so that the upper front cover 51 has a top surface 55, a right side surface 54, a left side surface 53, It is in close contact with the front edge of the first partition plate 59, and forms a space in which airtightness is ensured. The second space S2 is formed through a slight gap that may exist between the inspection opening 51a and the inspection lid 51b in the upper front cover 51, or through a second space S2 in the first partition plate 59 to which the wiring sealing material 90 is attached. It is connected to the space outside the electrical component casing 50a only through the first opening 59a, the third space S3, and the opening 56a to which the wiring sealing material 90 is attached. Further, the fourth substrate 64 and the electrical components 65a arranged in the second space S2 are set according to the user's request and as necessary. Therefore, exposure of the second space S2 to the outside is limited to exposure by removing the inspection cover 51b or by removing the upper front cover 51 when necessary. Therefore, the degree of airtightness of the second space S2 is higher than the degree of airtightness of the third space S3. Specifically, the degree of airtightness of the second space S2 preferably satisfies the protection grade IP55 or IP55 or higher defined in JIS C 0920, and more preferably satisfies IP66.

Further, the first space S1 is defined by a back surface 57, a top surface 55, a bottom surface 56, a right side surface 54, and a left side surface 53, which are integrally constructed, and a second partition plate 58 fixed thereto by screws. Sealing is ensured by being covered. Moreover, the first space S1 is formed through the opening 56b to which the wiring sealing material 90 is attached in the lower surface 56, or through the second opening 58a in the second partition plate 58 to which the wiring sealing material 90 is attached. Only through the second space S2, the first opening 59a to which the wiring sealing material 90 is attached in the first partition plate 59, the third space S3, and the opening 56a to which the wiring sealing material 90 is attached, It connects with the space outside the electrical component casing 50a. Among them, the electrical wiring 63b passing through the opening 56b of the lower surface 56 is already connected to the compressor 21 when the outdoor unit 2 is shipped from the factory. As described above, since no on-site work is planned for the electric wiring 63b, the space between the edge of the opening 56b of the lower surface 56 and the electric wiring 63b is to be removed by factory work using the wiring sealing material 90. Well sealed. In addition, dust does not enter the first space S1 through the opening 56b of the lower surface 56 during construction of the outdoor unit 2 at the site. Therefore, dust in the outer space of the electrical component casing 50a is sufficiently prevented from entering the first space S1 through the opening 56b. Therefore, the degree of airtightness of the first space S1 is higher than the degree of airtightness of the second space S2. Specifically, the degree of airtightness of the first space S1 preferably satisfies the protection grade IP55 or IP55 or more defined in JIS C 0920, and more preferably satisfies IP66.

(5) Cooling by First Cooling Portion 34 The first space S<b>1 of the outdoor controller 50 is cooled by the first cooling portion 34 of the first cooling circuit 31 . Specifically, the first cooling portion 34 of the first cooling circuit 31 thermally cools from the back side of the electrical component casing 50a through the plurality of first heat transfer members 34a in the vicinity of the upper end on the back side of the electrical component casing 50a. provided to come into contact with The first heat transfer member 34a has a flat surface extending parallel to the rear surface 57 of the electrical component casing 50a, and is used such that the flat surface is in surface contact with the rear surface 57. As shown in FIG. The first cooling portion 34 extends from the left end to the right end on the back surface of the electrical component casing 50a, then folds back through the U-shaped portion and extends to the left end. They are arranged side by side.

In this way, in the first space S1 of the outdoor control unit 50, the space above the back side is cooled by the first cooling part 34 of the first cooling circuit 31, so that in the first space S1, the dotted line in FIG. Natural convection as shown can be generated, and the cooling efficiency of the first space S1 can be enhanced. Specifically, the cool air generated above the back side of the first space S1 descends on the back side, is warmed by cooling the IPM 62a and IPM 63a, which are heat-generating components, and rises as an upward air current on the front side. , cools the noise filter 61a, which is a heat-generating component, and circulates. In this embodiment, since the IPM 62a and the IPM 63a generate more heat than the noise filter 61a, the IPM 62a and the IPM 63a can be preferentially cooled.

The plurality of first heat transfer members 34a are fixed in a state of being pressed against the rear surface 57 of the electrical component casing 50a using fixing portions 70 and spacers 72, which will be described below.

The fixing portion 70 has a back-side fixing member 71 , a left fixing member 73 , a right fixing member 74 , a left fixed member 75 , a right fixed member 76 , screws 77 , and screws 78 . .

The back-side fixing member 71 is a rod-shaped member that extends along the left-right direction, which is the longitudinal direction of the first cooling portion 34, near the upper end of the back surface 57 of the electrical component casing 50a. The right end portion of the rear-side fixing member 71 is located further to the right than the right side surface 54 of the electrical component casing 50a. The left end portion of the rear-side fixing member 71 is positioned further to the left than the left side surface 53 of the electrical component casing 50a.

The left fixing member 73 is a rod-shaped member extending in the front-rear direction in the vicinity of the upper end of the left side surface 53 of the electrical component casing 50a. A rear end portion of the left fixing member 73 is connected to a left end portion of the rear fixing member 71 . The left fixed member 75 is fixed to the outside of the left side surface 53 of the electrical component casing 50a by brazing, screws, or the like. The left fixed member 75 has a fixed portion that protrudes leftward from the left side surface 53 on the front side of the center of the electrical component casing 50a in the front-rear direction. The screw 77 fastens the front end of the left fixing member 73 and the fixed portion of the left fixed member 75 . Specifically, the fixed portion of the left fixed member 75 is placed in contact with the front end portion of the left fixed member 73 from the front side, and the front side of the fixed portion of the left fixed member 75 is Both are fastened by screwing the screw 77 toward the rear. The left fixing member 73 is pulled forward by being connected to the left fixed member 75 by a screw 77 . As a result, the left end of the rear-side fixing member 71 connected to the left-side fixing member 73 is biased forward.

The right fixing member 74 is a rod-shaped member extending in the front-rear direction in the vicinity of the upper end portion of the right side surface 54 of the electrical component casing 50a. A rear end portion of the right fixing member 74 is connected to a right end portion of the rear fixing member 71 . The right fixed member 76 is fixed to the outside of the right side surface 54 of the electrical component casing 50a by brazing, screws, or the like. The right fixed member 76 has a fixed portion that protrudes further to the right from the right side surface 54 on the front side of the center of the electrical component casing 50a in the front-rear direction. The screw 78 fastens the front end of the right fixing member 74 and the fixed portion of the right fixing member 76 . Specifically, in a state in which the fixed portion of the right member to be fixed 76 is placed in contact with the front end portion of the right fixing member 74 from the front side, the front side of the fixed portion of the right member to be fixed 76 is Both are fastened by screwing the screw 78 toward the rear. The right fixing member 74 is pulled forward by being connected to the right fixed member 76 by a screw 78 . As a result, the left end of the rear side fixing member 71 connected to the right side fixing member 74 is biased forward.

The spacer 72 is provided so as to contact the rear side of the plurality of first heat transfer members 34a, and is a rod-shaped member extending along the left-right direction, which is the longitudinal direction of the first cooling portion 34. As shown in FIG. A back side fixing member 71 is in contact with the back side of the spacer 72 . The left end of the spacer 72 is positioned to the right of the left end of the rear fixing member 71 , and the right end of the spacer 72 is positioned to the left of the right end of the rear fixing member 71 . A portion of the first cooling portion 34 extending to the left from the lower end portion of the U-shaped portion is located below the spacer 72 , and a U-shaped portion of the first cooling portion 34 is located above the spacer 72 . A portion extending to the left from the upper end portion of the shaped portion is located. The U-shaped portion of the first cooling portion 34 is positioned further to the right of the right end of the spacer 72 . As a result, even when the rear side fixing member 71 is biased forward, the rear side fixing member 71 does not crush the U-shaped portion of the first cooling portion 34 .

The first cooling portion 34 of the first cooling circuit 31 is located between the rear surface 57 of the electrical component casing 50a and the rear fixing member 71 when viewed from above. As a result, the rear surface 57, the first cooling portion 34, and the rear-side fixing member 71 are arranged in this order from the front side.

With the arrangement configuration described above, the left side fixing member 73 and the right side fixing member 74 are biased forward, so that the rear side fixing member 71 connects the plurality of first heat transfer members 34a via the spacers 72 to the electrical component casing 50a. can be pressed against the rear surface 57 of the . A plurality of first heat transfer members 34a, to which the first cooling portions 34 of the first cooling circuit 31 are fixed, maintain good contact with the rear surface 57 of the electrical component casing 50a. This allows the first cooling portion 34 of the first cooling circuit 31 to be in thermal contact with the rear surface 57 of the electrical component casing 50a.

(6) Cooling by Second Cooling Portion 38 A plurality of second cooling portions 38 of the second cooling circuit 35 are provided above and near the portion of the second partition plate 58 of the outdoor control unit 50 facing the third space S3. are provided so as to be in thermal contact with each other via the second heat transfer member 38a. The second heat transfer member 38 a has a flat surface extending parallel to the second partition plate 58 and is used so that the flat surface is in surface contact with the second partition plate 58 .

The first connection pipe 39a and the second connection pipe 39b connected to the respective ends of the second cooling portion 38 are provided in a portion of the lower surface 56 of the electrical component casing 50a located on the lower left side of the third space S3. It passes vertically through the opening of the surface 56x. As a result, the second cooling circuit 35 is drawn into the third space S3, and the second cooling portion 38 is positioned within the third space S3. In the third space S3, the second cooling portion 38 extends from the point where it is connected to the end of the first connection pipe 39a to the right end, then folds back through the U-shaped portion to reach the second connection pipe 39b. extending back to the left until it reaches the point where it is connected to the end of the The connecting portion between the second connecting pipe 39b and the second cooling portion 38 is arranged above the connecting portion between the first connecting pipe 39a and the second cooling portion 38 .

In this way, the portion of the second partition plate 58 of the outdoor control unit 50 facing the third space S3 is cooled by the second cooling portion 38 of the second cooling circuit 35, so that the second partition plate It is possible to cool the IPM 62a and IPM 63a, which are heat-generating components provided in the first space S1 facing the surface of the 58 opposite to the third space S3 side.

Each second heat transfer member 38a is fixed from the front side of the second partition plate 58 by a screw 38b extending in the front-rear direction.

(7) Movement of the second cooling section 38 The second cooling circuit 35 includes a first connection pipe 39a extending from one end of the lower side of the second cooling section 38 and the other end of the upper side of the second cooling section 38. and a second connection pipe 39b.

The first connection pipe 39a includes a first curved portion 81a, a first straight portion 81b, a second curved portion 81c, a second straight portion 82, a third curved portion 83a, a third straight portion 83b, a fourth curved portion 83c, a It has 5 curved portions 84a, a 4th straight portion 84b, and a 6th curved portion 84c. These first curved portion 81a, first straight portion 81b, second curved portion 81c, second straight portion 82, third curved portion 83a, third straight portion 83b, fourth curved portion 83c, fifth curved portion 84a, The 4th straight portion 84b and the 6th curved portion 84c are connected to each other in this order from one end of the lower side of the second cooling portion 38 . The first linear portion 81b, the third linear portion 83b, and the fourth linear portion 84b all extend vertically. In this embodiment, the fourth straight portion 84b is longer than the first straight portion 81b and longer than the third straight portion 83b. The second straight portion 82 extends in the left-right direction. The first curved portion 81a, the second curved portion 81c, the third curved portion 83a, the fourth curved portion 83c, the fifth curved portion 84a, and the sixth curved portion 84c all have a curved shape of 90 degrees.

The second connection pipe 39b includes a seventh curved portion 85a, a fifth straight portion 85b, an eighth curved portion 85c, a sixth straight portion 86, a ninth curved portion 87a, a seventh straight portion 87b, a tenth curved portion 87c, a It has eight straight portions 88, an eleventh curved portion 89a, a ninth straight portion 89b, and a twelfth curved portion 89c. These seventh curved portion 85a, fifth straight portion 85b, eighth curved portion 85c, sixth straight portion 86, ninth curved portion 87a, seventh straight portion 87b, tenth curved portion 87c, eighth straight portion 88, The eleventh curved portion 89a, the ninth straight portion 89b, and the twelfth curved portion 89c are connected to each other in this order from the other upper end of the second cooling portion . The fifth linear portion 85b, the seventh linear portion 87b, and the ninth linear portion 89b all extend vertically. In this embodiment, the ninth straight portion 89b is longer than the fifth straight portion 85b and longer than the seventh straight portion 87b. The sixth straight portion 86 and the eighth straight portion 88 extend in the left-right direction. The seventh curved portion 85a, the eighth curved portion 85c, the ninth curved portion 87a, the tenth curved portion 87c, the eleventh curved portion 89a, and the twelfth curved portion 89c all have a curved shape of 90 degrees.

With the above configuration, the first connection pipe 39a bends downward from the lower end of the second cooling portion 38 at the first curved portion 81a and extends downward at the first straight portion 81b, thereby forming the movable surface 56x. It penetrates in the vertical direction and extends outward and downward from the electrical component casing 50a. The first connection pipe 39a bends leftward at the second curved portion 81c, extends leftward at the second straight portion 82, and then bends upward at the third curved portion 83a. Further, the first connection pipe 39a extends upward at the third straight portion 83b, bends leftward at the fourth curved portion 83c, bends downward at the fifth curved portion 84a, and then bends downward at the fourth straight portion 84b. and bends to the right at the sixth curved portion 84c.

The second connection pipe 39b bends downward at the seventh curved portion 85a from the upper end of the second cooling portion 38 and extends downward at the fifth straight portion 85b, thereby penetrating the movable surface 56x in the vertical direction. , and extends outward and downward from the electrical component casing 50a. The second connection pipe 39b bends leftward at the eighth curved portion 85c, extends leftward at the sixth straight portion 86, and then bends upward at the ninth curved portion 87a. Further, the second connection pipe 39b extends upward at the seventh straight portion 87b and then bends leftward at the tenth curved portion 87c. The second connection pipe 39b extends leftward at the eighth straight portion 88, bends downward at the eleventh curved portion 89a, extends downward at the ninth straight portion 89b, and then extends rightward at the twelfth curved portion 89c. bent to.

Here, the first connection pipe 39a and the second connection pipe 39b extend along each other, and the portion extending substantially parallel to the direction of the rotation axis when rotating the second cooling circuit 35 is sufficiently secured for a long time.

The above-described second cooling circuit 35 can be moved forward as shown in FIG. 10 during construction of the outdoor control unit 50 and during maintenance after construction.

Here, when moving the second cooling circuit 35, the worker first removes the upper front panel 16 of the outdoor unit casing 11 to form the opening 16a. Then, the operator accesses the outdoor control section 50 through the opening 16 a of the outdoor unit casing 11 and removes the lower front cover 52 of the outdoor control section 50 . Next, the worker removes each second heat transfer member 38a from the second partition plate 58 by removing each screw 38b. In this state, the worker twists the fourth straight portion 84b of the first connecting pipe 39a and the ninth straight portion 89b of the second connecting pipe 39b as rotation axes, or rotates the fourth straight portion 84b. and the ninth linear portion 89b as the axis of rotation, and rotate the second cooling circuit 35 by 90 degrees. As a result, the second cooling portion 38 of the second cooling circuit 35 can be moved forward while the movable surface 56x of the lower surface 56 of the electrical component casing 50a is integrated with the first connecting pipe 39a and the second connecting pipe 39b. can be done. Here, the second cooling portion 38, the first connection pipe 39a, and the second connection pipe 39b in the second cooling circuit 35 can be arranged so as not to overlap with the rest of the outdoor control section 50 when viewed from the front.

Subsequently, as shown in FIG. 11, the operator presses the first cooling portion 34 against the rear surface 57 of the electrical component casing 50a and fixes it to the screw 77 fixed to the left fixing member 73 and to the right fixing member 74. Remove the screw 78 attached. As a result, the operator can access the parts of the outdoor control unit 50 other than the lower front cover 52 of the electrical component casing 50a, the first board 61, the second board 62, the third board 63, the fourth board 64 and the fifth board 65. It is possible to remove the object to be removed from the front side as a whole.

(8) Features of the Embodiment In the outdoor unit 2 of the refrigeration apparatus 1 of the present embodiment, the heat-generating components of the outdoor controller 50 are the first cooling section 34 of the first cooling circuit 31 and the second cooling section 34 of the second cooling circuit 35 . A cooling portion 38 may be used for cooling. Therefore, the temperature of the heat-generating components of the outdoor control unit 50 can be prevented from rising excessively, and the reliability of the outdoor control unit 50 can be improved.

In addition, the outdoor control unit 50 of the present embodiment employs a closed structure, and can particularly prevent dust from entering the second space S2 and the first space S1. In the outdoor control unit 50 having a closed structure, it is difficult to introduce the airflow generated by the outdoor fan 26 into the electrical component casing 50a to promote heat dissipation from the internal electrical components. However, the outdoor control unit 50 of the present embodiment can sufficiently cool the electrical equipment using the first cooling portion 34 and the second cooling portion 38 . As a result, the outdoor control unit 50 can suppress the intrusion of dust while cooling the heat-generating components.

Further, in the outdoor unit 2 of the present embodiment, the sealing degree of the first space S1 of the outdoor control section 50 is higher than the sealing degrees of the second space S2 and the third space S3. Moreover, when the outdoor unit 2 is constructed, the initial settings for the first board 61 having the noise filter 61a, the second board 62 having the IPM 62a, and the third board 63 having the IPM 63a, which are arranged in the first space S1, are The first space S1 is not released during construction. Therefore, it is possible to suppress dust from entering the first space S1.

Here, the fourth board 64 having the electrical component 64a and the fifth board 65 having the electrical component 65a, which are arranged in the second space S2, may be installed by a field worker at the time of construction of the outdoor unit 2 according to the user's request. However, by removing the inspection cover 51b and accessing through the inspection opening 51a, or by removing the upper front cover 51 and accessing, any initial setting is performed. As described above, the outdoor control unit 50 includes a portion exposed to the outside of the electrical component casing 50a at the time of initial setting, but only the second space S2 is exposed, and the first space S1 is the second space S1. It can be limited to exposure through the opening 58a. Therefore, even if the outdoor control unit 50 has a board and electrical components that are initialized at the time of construction, it is possible to suppress adverse effects of dust on the board and electrical components arranged in the first space S1. can. Also, a low level of resistance to dust is sufficient for the substrates and electrical components arranged in the first space S1.

The outdoor control unit 50 further includes an opening 56a through which electrical wiring extending from equipment to be connected other than the compressor 21 is passed, and a terminal block 69 to which electrical wiring extending from equipment other than the compressor 21 is connected. 3 space S3. At the time of construction, the work of connecting the electrical wiring extending from the equipment other than the compressor 21 to the connection terminal of the terminal block 69 through the opening 56a is performed. In order to operate the connection terminals of the terminal block 69 during construction, the lower front cover 52 is removed to release the third space S3. Therefore, dust from the outside of the electrical component casing 50a may enter the third space S3. Moreover, the electric wirings 64b and 65b connected to the connection terminals of the terminal block 69 are connected to the fourth substrate 64 and the fifth substrate 65 arranged in the second space S2. The electrical wirings 61b and 62b connected to the connection terminals of the terminal block 69 are connected to the first substrate 61 and the second substrate 62 arranged in the first space S1. For this reason, there is a possibility that dust that has entered the third space S3 may reach the second space S2 or the first space S1. However, in the outdoor control unit 50 of the present embodiment, the third space S3 and the second space S2 are separated by the first partition plate 59, and the first opening 59a provided in the first partition plate 59 has A wiring sealing material 90 is attached, and the electrical wirings 61b, 62b, 64b, and 65b are covered with the wiring sealing material 90. As shown in FIG. Therefore, even if dust enters the third space S3, it is prevented from reaching the second space S2. Further, in the outdoor control unit 50, the second space S2 and the first space S1 are separated by a second partition plate 58, and a second opening 58a provided in the second partition plate 58 is provided with a sealing material for wiring. 90 is attached, and the periphery of the electrical wirings 61b and 62b is covered with the sealing material 90 for wiring. Further, the second partition plate 58 is not provided with an opening that directly communicates the third space S3 and the first space S1. Furthermore, since the opening 56b of the lower surface 56 provided below the first space S1 is not a portion to be manipulated during on-site construction, it is already sufficiently sealed with the wiring sealing material 90 when the outdoor unit 2 is shipped from the factory. Therefore, it will be maintained without being released even during construction at the site. Therefore, even if dust reaches the second space S2, it is suppressed from reaching the first space S1.

(8) Features of the Embodiment In the outdoor unit 2 of the refrigeration apparatus 1 of the present embodiment, the heat-generating components of the outdoor controller 50 are the first cooling section 34 of the first cooling circuit 31 and the second cooling section 34 of the second cooling circuit 35 . A cooling portion 38 may be used for cooling. Therefore, the temperature of the heat-generating components of the outdoor control unit 50 can be prevented from rising excessively, and the reliability of the outdoor control unit 50 can be improved.

In addition, the outdoor control unit 50 of the present embodiment employs a closed structure, and can particularly prevent dust from entering the second space S2 and the first space S1. In the outdoor control unit 50 having a closed structure, it is difficult to introduce the airflow generated by the outdoor fan 26 into the electrical component casing 50a to promote heat dissipation from the internal electrical components. However, the outdoor controller 50 of the present embodiment can sufficiently cool the electrical equipment using the first cooling portion 34 and the second cooling portion 38 . As a result, the outdoor control unit 50 can suppress the intrusion of dust while cooling the heat-generating components.

Here, the first cooling portion 34 of the first cooling circuit 31 is in thermal contact with the relatively wide rear surface 57 of the electrical component casing 50 a of the outdoor control section 50 to perform cooling. Therefore, it is possible to sufficiently obtain the cooling effect of the electrical component by the first cooling portion 34 . Further, since a sufficient cooling effect is obtained by the first cooling portion 34 in this way, there is no need to arrange the first cooling circuit 31 along the left side surface 53 and the right side surface 54 of the electrical component casing 50a. It is not necessary to make the length of the left side 53 and the right side 54 long in the front-rear direction in order to secure a wide surface. Therefore, it is possible to keep the dimension of the electrical component casing 50a in the front-rear direction small. Therefore, the electrical component casing 50a is less likely to obstruct the air flow in the space surrounded by the outdoor heat exchanger 23, and the outdoor fan 26 can easily ensure the air volume.

In the outdoor unit 2 of the present embodiment, maintenance of the outdoor controller 50 can be easily performed by removing the upper front panel 16 of the outdoor unit casing 11 to expose the opening 16a.

Further, in the outdoor unit 2 of the present embodiment, the first cooling portion 34 of the first cooling circuit 31 is fixed so as to be pressed against the rear surface 57 of the electrical component casing 50a from behind. As a result, the cooling effect of the first cooling portion 34 on the back surface 57 of the electrical component casing 50a can be enhanced. In addition, when the upper front panel 16 of the outdoor unit casing 11 is removed to expose the opening 16a, the first cooling portion 34 of the first cooling circuit 31 exists on the back side of the electrical component casing 50a, so that it is directly It is difficult to press the first cooling portion 34 against the electrical component casing 50a. On the other hand, in the present embodiment, the rear fixing member 71 is used to press the first cooling portion 34 against the rear surface 57 of the electrical component casing 50a. A left fixing member 73 and a right fixing member 74 are connected to the left and right ends of the back side fixing member 71 . The left fixing member 73 and the right fixing member 74 are fixed to the left fixing member 75 and the right fixing member 76 so as to be pulled forward. The work of fixing the left fixed member 75 and the right fixed member 76 using the screws 77 and 78 can be performed from the front side through the opening 16 a of the outdoor unit casing 11 . Therefore, it is possible to realize a structure that enhances the cooling effect of the back surface 57 of the electrical component casing 50a by working from the front side through the opening 16a of the outdoor unit casing 11. FIG.

Here, in the outdoor unit 2 of the present embodiment, the second cooling portion 38 is positioned in front of the outdoor controller 50, but when the upper front panel 16 of the outdoor unit casing 11 is removed to reveal the opening 16a, , the second cooling portion 38 can be rotated forward. Therefore, it becomes easy to access the outdoor control unit 50 through the opening 16a of the outdoor unit casing 11, and the outdoor control unit 50 can be easily removed.

(9) Other Embodiments (9-1) Other Embodiment A
In the above embodiment, the outdoor control unit 50 is cooled by the second cooling portion 38 of the second cooling circuit 35 from the front side, and cooled by the first cooling portion 34 of the first cooling circuit 31 from the rear side. mentioned and explained.

On the other hand, for example, if the electric components of the outdoor control unit 50 can be sufficiently cooled, the cooling by the second cooling part 38 is omitted and the second cooling circuit 35 of the above embodiment is not provided. may be configured.

(9-2) Other embodiment B
In the above embodiment, the case where the back-side fixing member 71 presses the plurality of first heat transfer members 34a against the back surface 57 of the electrical component casing 50a via the spacer 72 has been described as an example.

On the other hand, the back-side fixing member 71 of the above embodiment may be configured so as to eliminate the need for the spacer 72 as a separate member by providing a portion corresponding to the shape of the spacer 72 of the above embodiment. Specifically, the rear side fixing member 71 has a portion extending leftward from the lower end portion of the U-shaped portion of the first cooling portion 34 and an upper end portion of the U-shaped portion of the first cooling portion 34 . and the left side of the U-shaped portion of the first cooling portion 34, a forwardly bulging portion may be provided. As a result, the plurality of first heat transfer members 34a can be pressed against the rear surface 57 of the electrical component casing 50a without crushing the first cooling portion 34 without the spacer 72 as a separate member.

(9-3) Other embodiment C
In the above embodiment, the case where the back side fixing member 71 is used in a state of being connected with the left side fixing member 73 and the right side fixing member 74 has been described as an example.

However, the back side fixing member 71, the left side fixing member 73, and the right side fixing member 74 may be integrally formed members instead of separate members.

The left fixing member 73 extends forward until it reaches the left edge of the upper front cover 51 instead of fixing the front end to the left fixed member 75 with screws 77. , it may have a claw that protrudes to the right side and can be hooked on the edge of the left side of the upper front cover 51 . Similarly, the right fixing member 74 extends forward until it reaches the right edge of the upper front cover 51 instead of having its front end fixed to the right fixed member 76 by a screw 78. It may be configured to have a claw that protrudes leftward at the part and can be hooked on the edge of the right side of the upper front cover 51 .

In this way, the fixing part 70 is not particularly limited as long as it can press the back side fixing member 71 against the plurality of first heat transfer members 34a.

(Appendix)
Although embodiments of the present disclosure have been described above, it will be appreciated that various changes in form and detail may be made without departing from the spirit and scope of the present disclosure as set forth in the appended claims. .

Reference Signs List 1: Refrigerating device 2: Outdoor unit 4: Indoor unit 5: Gas refrigerant communication pipe 6: Liquid refrigerant communication pipe 10: Refrigerant circuit 11: Outdoor unit casing (casing)
16: Upper front panel 16a: Opening (maintenance opening)
21: Compressor 23: Outdoor heat exchanger 26: Outdoor fan 30: Cooling circuit 31: First cooling circuit (refrigerant pipe)
34: first cooling portion (cooling portion)
34a: first heat transfer member (heat transfer member)
35: Second cooling circuit 38: Second cooling part 50: Outdoor control unit (electrical component unit)
50a: Electrical equipment casing (sealed container)
51: Upper front lid (first surface)
52: lower front lid (first surface)
53: Left side (side)
54: right side 57: back (cooling surface, second surface)
70: fixed part (fixing means)
71: back side fixing member (first part)
72: Spacer 73: Left fixing member (second part)
74: right fixing member (second part)

JP 2011-99578 A

Claims (8)

An electrical component unit (50) having a first electrical component (61a) , second electrical components (62a, 63a), and a sealed container (50a) in which the first electrical component and the second electrical component are accommodated )When,
a refrigerant pipe (31) having a cooling portion (34) in thermal contact with the electrical component unit and through which a refrigerant flows;
a casing (11) having a maintenance opening (16a) and housing the electrical component unit and the refrigerant pipe;
with
The electrical component unit is positioned between the cooling portion of the refrigerant pipe and the maintenance opening ,
The sealed container and the cooling portion of the refrigerant pipe are in thermal contact on a cooling surface (57) on the opposite side of the maintenance opening side of the sealed container,
The first electrical component (61a) and the second electrical components (62a, 63a) arranged below the first electrical component are located inside the sealed container and away from the cooling surface. located in the
The second electrical component (62a, 63a) has a higher degree of heat generation than the first electrical component (61a).
An outdoor unit (2) of a refrigerator. The degree of sealing of the sealed container satisfies IP55 of the protection class specified in JIS C 0920,
The outdoor unit of a refrigeration system according to claim 1 . The cooling part of the refrigerant pipe is in thermal contact with the sealed container at a position biased to the upper side of the sealed container,
The outdoor unit of a refrigeration system according to claim 1 or 2 . The sealed container includes first surfaces (51, 52) located on the maintenance opening side, second surfaces (57) located on the side opposite to the maintenance opening side with respect to the first surface, and It has a side surface (53) connecting the first surface and the second surface,
said second surface (57) is wider than said side surface (53);
The outdoor unit of a refrigeration system according to any one of claims 1 to 3 . further comprising a heat transfer member (34a) positioned between the electrical component unit and the cooling portion of the refrigerant pipe,
The outdoor unit of a refrigeration system according to any one of claims 1 to 4 . Further comprising fixing means (70) for pressing and fixing the heat transfer member against the electrical component unit,
The outdoor unit of the refrigeration system according to claim 5 . further comprising a spacer (72) positioned between the fixing means and the heat transfer member;
the cooling portion of the refrigerant pipe is positioned between the electrical component unit and the fixing means;
The fixing means presses the heat transfer member against the electrical component unit via the spacer.
The outdoor unit of the refrigeration system according to claim 6 . The fixing means is connected to a first portion (71) located on the opposite side of the heat transfer member from the electrical component unit side, and is connected to the first portion to allow the side of the electrical component unit to extend through the maintenance opening. a second portion (73, 74) extending toward the side;
The fixing means presses the heat transfer member against the electrical component unit by the first portion by pulling the second portion toward the maintenance opening.
The outdoor unit of a refrigeration system according to claim 6 or 7 .

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