WO2013005810A1 - Outdoor unit for refrigeration cycle device - Google Patents

Abstract

In an outside unit for a refrigeration cycle device in an embodiment, the interior of the outdoor unit (1) is partitioned by a partition plate (3) into a heat exchange chamber (4) and a mechanical chamber (5), a heat exchanger (7) and fan (8a, 8b) are housed in the heat exchange chamber (4), and a compressor (10) and heat cycle components (11) are housed in the mechanical chamber (5). Inverter boards (15, 16) on which electrical components have been mounted to operate the compressor (10) and the fan (8a, 8b) are housed in front of the heat exchanger (7) and above the fan (8a, 8b), and heat sinks (23, 24) for cooling the electrical components are mounted on the back sides of the inverter boards (15, 16). The inverter boards (15, 16) and the heat sinks (23, 24) are supported on an incline so that the upper end is to the rear of the lower end. This more efficiently cools electrical components which generate a significant amount of heat, prevents adverse thermal effects with respect to the other electrical components, and improves reliability.

Description

Outdoor unit of refrigeration cycle equipment

The embodiment of the present invention relates to an outdoor unit constituting a refrigeration cycle apparatus, for example, a multi-type air conditioner.

As a refrigeration cycle apparatus, for example, there is a multi-type air conditioner in which a plurality of indoor units are connected to a single outdoor unit to achieve air conditioning in a plurality of rooms. In this type of outdoor unit, outside air is sucked into the inside from the back and side surfaces of the unit body, and flows into the heat exchanger to exchange heat with the refrigerant. The air after heat exchange is blown out from the front of the main body.

A technique is known in which an existing design of a low-capacity outdoor unit is diverted and a heat exchanger or side plate is extended in the height direction to change to a high-capacity outdoor unit (for example, see Patent Document 1). In addition, a technique related to a cooling structure for electrical components such as a compressor used for a high-capacity outdoor unit and an inverter that drives a blower is known (for example, see Patent Document 2).

JP 2008-133986 A JP 2008-138941 A

In any outdoor unit, the inside of the main body is partitioned through a partition plate into a heat exchange chamber in which a heat exchanger and a blower are accommodated, and a machine room in which a compressor and refrigeration cycle components are accommodated.
Electric parts that drive and control electric parts such as a compressor and a blower generate a large amount of heat with the action. For this reason, depending on the arrangement structure, there is a possibility that other electrical components may be adversely affected by heat.

Under such circumstances, an outdoor unit of a refrigeration cycle apparatus that can efficiently cool an electrical component with a large amount of generated heat and reliably prevent adverse thermal effects on other electrical components to improve reliability is desired. Yes.

In the outdoor unit of the refrigeration cycle apparatus of the present embodiment, the interior of the outdoor unit main body is partitioned into a heat exchange chamber and a machine room by a partition plate.

A heat exchanger is housed in the heat exchange chamber, and a blower that guides outside air from at least the back side of the outdoor unit body to flow through the heat exchanger and blows it out of the front surface of the outdoor unit body is housed.

The machine room accommodates a compressor and refrigeration cycle components including a refrigerant pipe connected to the compressor and the heat exchanger, an accumulator, and the like.

In the heat exchange chamber, an inverter board on which electric parts for driving and controlling electric parts such as a compressor and a blower are mounted on the front side of the heat exchanger and above the blower.

A heat sink for cooling the electrical components mounted on the inverter board is attached to the back of the inverter board.

The inverter board and the heat sink are supported by being tilted back and forth so that the upper end of each is on the back side and the lower end is on the front side.

It is an external appearance perspective view of the outdoor unit of the refrigerating cycle device concerning this embodiment. It is a perspective view inside the outdoor unit (however, illustration is abbreviate | omitted about the electrical component unit) based on the embodiment. It is a partial perspective view inside the outdoor unit in the state where the electrical component unit is attached according to the embodiment. It is a perspective view of the electrical component unit based on the embodiment. It is a perspective view of the back side of the electrical component unit based on the embodiment. It is a perspective view of the state which attached the cover to the electrical equipment unit based on the embodiment. It is a figure which shows the structure of the refrigerating cycle of the refrigerating-cycle apparatus based on the embodiment. It is a figure which shows the structure of the electrical component unit etc. based on the embodiment.

Hereinafter, the outdoor unit of the refrigeration cycle apparatus according to the present embodiment will be described with reference to the drawings.

In this embodiment, an air conditioner is applied as the refrigeration cycle apparatus.
FIG. 7 is a diagram illustrating a configuration of the refrigeration cycle of the air-conditioning apparatus according to the present embodiment.
The configuration of the refrigeration cycle will be described along the refrigerant flow during the cooling operation.

The refrigerant pipe 11a connected to the discharge part of the variable capacity compressor 10 is connected to the first port of the four-way valve 11d via the muffler 11b and the check valve 11c, and the second port of the four-way valve 11d. One end of the outdoor heat exchanger 7 is connected via the refrigerant pipe 11a.
A rotational speed variable type blower 8 is disposed opposite to the outdoor heat exchanger 7. The blower 8 is composed of two blowers 8a and 8b, which are arranged vertically apart. The refrigerant pipe 11a connected to the other end of the outdoor heat exchanger 7 is connected to the liquid side packed valve 11g via the refrigerant tank 11e and the outdoor expansion valve 11f.

The refrigerant tank 11e stores excess refrigerant in the refrigeration cycle. The outdoor expansion valve 11f includes a first outdoor expansion valve 11f1 and a second outdoor expansion valve 11f2 provided in parallel. One end of the liquid side crossover piping P1 is connected to the liquid side packed valve 11g, and the other end is connected to the indoor unit N.

Here, two indoor units N1 and N2 are connected, and the indoor units N1 and N2 are respectively provided with indoor expansion valves Na1 and Nb1, indoor heat exchangers Na2 and Nb2, and an indoor fan (not shown). One end of the gas side crossover pipe P2 is connected to the indoor unit N, and the other end is connected to the gas side packed valve 11h of the outdoor unit S.

The gas side packed valve 11h is connected to the third port of the four-way valve 11d via the refrigerant pipe 11a, and the refrigerant pipe 11a connected to the fourth port of the four-way valve 11d is connected to the compressor 10 via the accumulator 11i. Connected to the suction part. The accumulator 11i separates the refrigerant into a liquid refrigerant and a gas refrigerant. The refrigerant circulates when the compressor 10 is driven in the refrigeration cycle configured as described above.

In the outdoor unit S, a temperature sensor TD and a high pressure side pressure sensor HPS are provided in the refrigerant pipe 11 a on the discharge side of the compressor 10. The temperature sensor TD detects the temperature of the gas refrigerant discharged from the compressor 10, and the high pressure side pressure sensor HPS detects the pressure on the discharge side of the compressor 10. The temperature sensor TO is provided outside the back side of the outdoor heat exchanger 7, and the temperature sensor TE is provided in the outdoor heat exchanger 7. The temperature sensor TO detects the outdoor temperature, and the temperature sensor TE detects the refrigerant temperature of the outdoor heat exchanger 7.

A temperature sensor TL is provided in the refrigerant pipe 11a between the outdoor expansion valve 11f and the liquid side packed valve 11g. The temperature sensor TL detects the temperature of the liquid refrigerant. A temperature sensor TS and a low-pressure sensor LPS are provided in the refrigerant pipe 11a on the suction side of the compressor.
The temperature sensor TS detects the temperature of the gas refrigerant sucked into the compressor 10, and the low pressure side pressure sensor LPS detects the pressure on the suction side of the compressor 10. These sensors are connected to a main control board 20 described later.

FIG. 1 is an external perspective view of an outdoor unit S of an air conditioner.
The outdoor unit main body 1 made of a housing is a vertically long rectangular box. The front plate 1a and the right side plate 1b in the figure are formed by combining a plurality of plates, and further, a bottom plate 1c and a top plate 1d are provided. The back and left sides (not shown) are made up of crosspieces, the inside is exposed, and air circulation is smooth. The outdoor unit main body 1 is composed of the plurality of plates and the crosspieces.

The plate unit 1aa of the outdoor unit main body 1, particularly from the front right corner to the right side, is provided with an opening 11ab that is opened in a state where the outdoor unit S is set as an air conditioner together with an indoor unit (not shown). From the opening 11ab, the refrigerant pipe, the power supply line, and the signal line protrude and extend to the indoor unit or the power supply part.

A pair of fan guards 2a and 2b are attached to the outdoor unit main body 1 at positions spaced apart vertically along the left side of the front surface. A blower opening (not shown) is opened in a plate body portion to which the fan guards 2a and 2b are attached, and the fan guards 2a and 2b cover the blower openings.

FIG. 2 is a perspective view showing the internal configuration of the outdoor unit S by removing the outdoor unit main body 1 with the bottom plate 1c left. However, illustration of electrical component units described later is omitted.

A partition plate 3 composed of a main partition plate 3a and an auxiliary partition plate 3b is erected on the bottom plate 1c on the back surface portion facing the right edge portions of the fan guards 2a and 2b shown in FIG. The main partition plate 3a is formed to have the same width dimension as the front and rear width dimension of the bottom plate 1c and substantially the same height as the upper end of the upper fan guard 2a so as to cross from the front end to the rear end of the bottom plate 1c. The

The auxiliary partition plate 3b is connected to the upper end of the main partition plate 3a. The upper end edge of the main partition plate 3a and the lower end edge of the auxiliary partition plate 3b are horizontal from the front end to the rear end. However, the upper end edge of the auxiliary partition plate 3b is horizontal only at the front end side and has a high inclination at a steep angle from here toward the back side. The rear side end is the highest and is located at a position slightly spaced from the top plate 1d.

The interior of the outdoor unit body 1 is divided into two chambers 4 and 5 by the partition plate 3 described above. Here, the left space chamber of the partition plate 3 is called a heat exchange chamber 4, and the right space chamber is called a machine chamber 5. The heat exchange chamber 4 accommodates an outdoor heat exchanger 7 and two fans 8a and 8b. The machine room 5 accommodates a compressor 10 and a refrigeration cycle component 11.

The outdoor heat exchanger 7 has a plurality of fins arranged in a substantially L shape in plan view with a narrow gap between the fins along the back side edge and the left side edge of the bottom plate 1c. It passes through the heat exchange pipe in a meandering manner. Rigid end plates are arranged on the outermost side of the fins at the end portions, and bent portions of the heat exchange pipe protrude from the end plates.

The blowers 8a and 8b are lined up and down and supported by the blower base 13. The blowers 8a and 8b are respectively provided with propeller fan type fans 8a2 and 8b2 attached to the rotation shafts of the fan motors 8a1 and 8b1, and the rear side air and the left side air in the unit main body 1 as the fans 8a2 and 8b2 rotate. Then, the air is blown toward the blowout port on the front side and the fan guards 2a and 2b.

The blower base 13 is erected on the bottom plate 1c at a substantially central position in the heat exchange chamber 4 when viewed from the front. A lower end portion is fixed to the bottom plate 1c via a mounting bracket, and includes a frame body arranged in parallel at a predetermined interval on the left and right sides, and an auxiliary frame spanned between the frame bodies.

A hook portion 13a made of a plate material bent in a substantially U shape downward is connected to the upper end of the frame body, and is hooked and fixed to the upper end portion of the outdoor heat exchanger 7. A horizontal support portion 13b is provided at a position below the hook portion 13a by a predetermined dimension. The horizontal support portion 13b protrudes horizontally from the frame body to the front side and is opened except for the peripheral edge. The front edge is bent slightly upward and is fixed to the front plate 1a.

The frame body, auxiliary frame, hooking portion 13a, and horizontal support portion 13b constituting the blower base 13 are all made of a metal material to reduce weight and ensure rigidity. Note that the upper blower 8a is attached to the lower part of the horizontal support portion 13b, but does not interfere with each other. The two blowers 8a and 8b supported by the blower base 13 are in positions facing the fan guards 2a and 2b with the outdoor unit main body 1 mounted on the bottom plate 1c.

Meanwhile, the compressor 10 and other refrigeration cycle components 11 are accommodated in the machine room 5. As refrigeration cycle components 11 housed in the machine room 5, a refrigerant pipe 11a, a muffler 11b, a check valve 11c, a four-way valve 11d, a refrigerant tank 11e, an outdoor expansion valve 11f, an accumulator 11i, an indoor It consists of the liquid side packed valve 11g, the gas side packed valve 11g, etc. for connecting with the unit N via the crossover piping P1, P2.

The four-way valve 11d is in the upper part of the refrigeration cycle components 11 housed in the machine room 5, and here, a refrigerant pipe 11a that communicates with the discharge part of the compressor 10 and a refrigerant pipe that communicates with the outdoor heat exchanger 7 11a, a refrigerant pipe 11a communicating with the accumulator 11i, and a refrigerant pipe 11a communicating with the gas side packed valve 11h are connected.

In particular, the refrigerant pipe 11a that communicates the four-way valve 11d and the discharge portion of the compressor 10 is once extended upward from the four-way valve 11d and bent in an inverted U shape at a position that does not contact the top plate 1d. It extends to the discharge part of the compressor 10.

It should be noted that the height position of the portion of the refrigerant pipe 11 a that is bent in a substantially U shape is set to a position higher than the upper end of the outdoor heat exchanger 7. Specifically, the heat exchange pipe penetrates and snakes through the fins constituting the outdoor heat exchanger 7, but at least a portion bent in a substantially U shape of the refrigerant pipe at a position higher than the uppermost heat exchange pipe. is there.

The above is the internal configuration of the outdoor unit body 1. The electrical component unit that is not shown will be described in detail with reference to FIG.
FIG. 3 is a partial perspective view of the inside of the outdoor unit to which the electrical component unit Y is attached. 4 is a perspective view of the electrical component unit Y. FIG. FIG. 5 is a perspective view of the back side of the electrical component unit Y. FIG. FIG. 6 is a perspective view of the electrical component unit Y with the cover 30 attached. FIG. 8 is a diagram illustrating a configuration of the electrical component unit Y.

The electrical component unit Y includes a blower inverter board 15, a compressor inverter board 16, an inclined base board 18 to which a noise filter board 17 is attached, a vertical base board 25 to which a main control board 20 is attached, and terminal blocks 26 a and 26 b. It is comprised from the connection body 22 of the attached terminal block base board 21. FIG.

Reference numeral 40 in FIG. 8 denotes a commercial three-phase four-wire power supply (AC 380 V), which is connected to the noise filter substrate 17 via the power supply terminal block 26 a and further connected to the compressor inverter substrate 16 via the relay 19. . AC 220V power is supplied from the noise filter board 17 to the inverter board 15 for the blower and the main control board 20. In addition, the blower inverter board 15, the compressor inverter board 16, and the main control board 20 are connected by a signal line W.

The blower inverter board 15 includes a converter that rectifies a single-phase alternating current of a 220V single-phase alternating current power supply between one phase of the three-phase power supply supplied from the noise filter substrate 17 and a neutral point line into a direct current voltage, and the direct current voltage. A smoothing capacitor for smoothing and a control board for driving the fan motors 8a1 and 8a2 on which electric components such as an inverter for controlling the voltage and frequency applied to the fan motors 8a1 and 8a2 are mounted. There is a large amount of heat generated from the switching elements of the inverter. A power factor improving reactor 31 is connected to the inverter board 15 for the blower.

The inverter board 16 for the compressor controls a converter that rectifies the three-phase AC of the 380 V three-phase commercial power supply 40 into a DC voltage, a smoothing capacitor that smoothes the DC voltage, and a voltage and a frequency that are applied to the compressor motor 10a. This is a control board for driving the compressor motor 10a on which electric parts such as an inverter are mounted, and a large amount of heat is generated from the rectifying element of the converter and the switching element of the inverter during operation. A power factor improving reactor 32 is connected to the inverter board 16 for the compressor.

The noise filter substrate 17 is a substrate on which electronic components that remove noise from the three-phase AC power supply 40 are mounted, and generates less heat during operation than the blower inverter substrate 15 and the compressor inverter substrate 16.

Here, when viewed from the front with respect to the inclined base plate 18, the blower inverter board 15 is arranged on the leftmost side, and the compressor inverter board 16 is arranged at a substantially central portion of the inclined base plate 18 along the right edge. The noise filter substrate 17 is arranged on the rightmost side. A relay 19 is disposed between the compressor inverter board 16 and the noise filter board 17.

The inclined base plate 18 is inclined in the front-rear direction so that the upper end is on the back side and the lower end is on the front side. Only the part facing the lower end part of the inverter board 15 for the blower and the inverter board 16 for the compressor of the inclined base plate 18 is provided integrally with the horizontal piece 18a protruding horizontally, and only the part facing the noise filter board 17; A vertical piece 18b that protrudes vertically downward is integrally provided.

In particular, as shown in FIG. 5, the first heat sink 23 and the second heat sink 24 protrude in parallel from the back surface of the inclined base plate 18 at positions separated from each other. The first heat sink 23 is attached to the compressor inverter board 16, and the second heat sink 24 is attached to the blower inverter board 15.

Both the first heat sink 23 and the second heat sink 24 are arranged in parallel with a plurality of fin materials made of an aluminum material or an aluminum alloy material having good heat dissipation, with a narrow gap therebetween. The gap between the fin materials needs to be specified in a direction along the inclination of the inclined base plate 18.

The main control board 20 receives signals from the indoor unit N and signals from various sensors such as the temperature sensor TO, and controls signals to the fan inverter 15, the compressor inverter 16, the four-way valve 11d, the outdoor expansion valve 11f, and the like. To control the outdoor unit S.

That is, the main control board 17 controls the operating frequency of the compressor motor 10a to control the rotation speed of the compressor 10, and switches the four-way valve 11d according to the operation mode of the cooling operation or the heating operation, and the fan motor 8a1, The operating frequency of 8b1 is controlled to control the rotational speed of the fans 8a and 8b to a required value, and the opening degree of the outdoor expansion valves 11f1 and 11f2 is controlled.

The main control board 20 is attached to the vertical base plate 25. A power supply terminal block 26 a and a communication terminal block 26 b are attached to the terminal block base plate 21. One of the vertical base plate 25 and the terminal block base plate 21 is provided with a claw portion, and the other is provided with a receiving portion, which are connected to each other.

Further, a claw portion is provided on one of the vertical piece 18b of the inclined base plate 18 and the connecting body 22 of the vertical base plate 25 and the terminal block base plate 21, and a receiving portion is provided on the other side. A connector 22 is attached to the plate 18.

In this way, the electrical component unit Y is configured, and in the outdoor unit main body 1, the horizontal support portion 13 b of the blower base 13 disposed in the heat exchange chamber 4 and the auxiliary partition plate 3 b constituting the partition plate 3 are provided. The electrical component unit Y is supported.

More specifically, after the left edge of the inclined base plate 18 is aligned with the left edge of the blower base 13, the horizontal piece 18 a of the inclined base plate 18 is placed on the horizontal support portion 13 b of the blower base 13. The front end of the base plate horizontal piece portion 18 a is brought into contact with the bent front end portion of the blower base horizontal support portion 13 b, and the upper end portion of the inclined base plate 18 is brought into contact with the front surface of the hook portion 13 a of the blower base 13.

In the state where the inclined base plate 18 is in an inclined posture, the upper end of the inclined base plate 18 is attached and fixed to the front surface of the blower base hooking portion 13a via a fixture. The blower inverter board 15 attached to the inclined base plate 18 is positioned on the front surface of the blower base 13, and the compressor inverter board 16 protrudes to the right side of the blower base 13.

A gap portion between the compressor inverter board 16 and the noise filter board 17 is placed on the upper end inclined portion of the auxiliary partition plate 3 b constituting the partition plate 3. By attaching and fixing the tilted base plate 18 and the auxiliary partition plate 3b via a fixture, the tilted base plate 18 is supported tilted back and forth so that the upper end is on the back side and the lower end is on the front side. The
Eventually, the blower inverter board 15 and the compressor inverter board 16 attached to the inclined base plate 18 are positioned on the heat exchange chamber 4 side partitioned by the partition plate 3.

On the other hand, a connecting body comprising a noise filter substrate 17 attached to the inclined base plate 18 on the machine room 5 side, a main control substrate 20 attached to the vertical base plate 25, and terminal blocks 26a and 26b attached to the terminal block base plate 21. 22 is located.

The first heat sink 23 and the second heat sink 24 protruding from the back side of the inclined base plate 18 are also located in the heat exchange chamber 4. Along with the inclined base plate 18, the blower inverter board 15, the compressor inverter board 16, and the first and second heat sinks 23 and 24 are all inclined forward and backward.
On the other hand, the vertical base plate 25 and the terminal block base plate 21 constituting the coupling body 22 are in a vertical posture with respect to the inclined base plate 18, and in parallel with the front panel when the outdoor unit body 1 is attached. The main control board 20 and the terminal blocks 26a and 26b are disposed on the main board.

As shown in FIG. 6, the inclined base plate 18 portion located in the heat exchange chamber 4 is covered with a cover 30. The cover 30 is composed of a horizontal upper surface portion, a vertical front surface portion, and a left side surface portion (not shown), and has a right triangle shape in a side view. The right side is open, and the right side opening is continuous with the upper end of the auxiliary partition plate 3b in a state of covering the inclined base plate 18.

As a result, the cover 30 covers the blower inverter board 15 and the compressor inverter board 16 attached to the inclined base plate 18 so as to be separated from the heat exchange chamber 4. On the other hand, the cover 30 opens to the machine room 5.

As shown in FIG. 2, a reactor 31 connected to the fan inverter board 15 and a reactor 32 connected to the compressor inverter board 16 are arranged vertically on the auxiliary partition plate 3b on the machine room 5 side. .

When an instruction to start the refrigeration cycle operation is input to the outdoor unit S from the indoor unit N side, a necessary control signal is sent from the electrical component unit Y to the electric parts such as the compressor 10 and the fans 8a and 8b. The compressor 10 is driven to perform the refrigeration cycle operation. The two blowers 8a and 8b are driven to suck external air into the inside from the back and left side surfaces of the outdoor unit main body 1, and cause the outdoor heat exchanger 7 to circulate.
In the outdoor heat exchanger 7, heat is exchanged between the refrigerant guided through the compressor 10 and the four-way valve 11d and the outside air. The external air after heat exchange is blown out of the front face of the main unit 1 through the fan guards 2a and 2b from the blowout port on the front face of the outdoor unit main body 1.

In the electrical component unit Y, in particular, the electrical components such as the rectifying element and the switching element mounted on the inverter board 16 for the compressor and the inverter board 15 for the fan have a very large amount of heat generated during operation. In the compressor inverter board 16, the heat is concentrated on the first heat sink 23 and is radiated. In the inverter board 15 for blower, heat is concentrated on the second heat sink 24 and is radiated.

On the other hand, external air is taken into the outdoor unit main body 1 by the two blowers 8a and 8b and flows through the outdoor heat exchanger 7. A part of the external air after flowing through the outdoor heat exchanger 7 flows along the electrical component unit Y disposed on the front side of the outdoor heat exchanger 7 and above the blowers 8a and 8b.

Specifically, the electric component unit Y is configured and flows along the back surface of the inclined base plate 18 that is supported by being inclined forward and backward. A first heat sink 23 and a second heat sink 24 protrude from the back surface of the inclined base plate 18 and are cooled by blowing external air onto them.

Furthermore, not only cooling of the base plate 18 and the first and second heat sinks 23 and 24, but also cooling of the compressor inverter board 16 and the blower inverter board 15 itself supported by the base plate 18 can be obtained. The heat taken away from each is quickly discharged to the outside together with the air exchanged with the outdoor heat exchanger 7.

The heat radiated from the heat sinks 23 and 24 does not enter the heat exchange chamber 4, and there is no thermal adverse effect on other electrical components. Since the inclined base plate 18 and the first and second heat sinks 23 and 24 are positioned immediately after flowing through the outdoor heat exchanger 7, the air blowing efficiency for these is not impaired.

The inclined base plate 18 and the first and second heat sinks 23 and 24 are tilted back and forth so that the upper end portion is on the back side and the lower end portion is on the front side, and the blower 8a is located in the lower part thereof. Since the external air to be blown flows smoothly along the inclination and further guided to the blower 8a, the cooling efficiency can be further improved.

When the tilted posture of the tilted base plate 18 and the like is reversed, with the upper end being the front side and the lower end being the rear side, external air does not flow to the upper part of the outdoor heat exchanger 7 and flows along the tilt. Air hits the top plate and generates a vortex. The air blowing efficiency is impaired, and sufficient cooling cannot be obtained. Therefore, the inclined base plate 18 and the like are limited to an inclined posture in which the upper end portion is on the back side and the lower end portion is on the front side.

In the case of rain, water drops are mixed with the outside air, and it falls on the outdoor heat exchanger 7, the inclined base plate 18, and the first and second heat sinks 23 and 24 as they are.
However, the compressor inverter board 16 and the blower inverter board 15 are covered by the cover 30 whose front, upper and left sides are closed, and are separated from each other in the heat exchange chamber 4. The electrical components mounted on the boards 15 and 16 are not wetted by rainwater, and there is no occurrence of a short circuit accident between the electrical components due to rainwater.

The right side of the cover 30 is open, but the opening is located at the upper end of the partition plate 3 and faces the machine room 5. Since no blower is disposed in the machine room 5 and a strong negative pressure environment such as the heat exchange chamber 4 is not formed, rainwater is not blown into the machine room 5 from the outside.

The right side of the cover 30 is open facing the machine room 5, but rainwater does not enter from here, so that the compressor inverter board 16 and the electrical components mounted on the blower inverter board 15 get wet. Nor.

In the inclined base plate 18, the compressor inverter board 16 and the blower inverter board 15 are mounted side by side. Since each inverter board | substrate 15 and 16 is in an equally-spaced position with respect to the outdoor heat exchanger 7, and is in the same inclination attitude | position, the heat exchange air after distribute | circulating the outdoor heat exchanger 7 passes through the base board 18. Each inverter board | substrate 15 and 16 is cooled equally.

Here, the blower inverter board 15 is arranged on the left side when viewed from the front, and the compressor inverter board 16 is arranged on the right side. These inverter boards 15 and 16 may be arranged by switching left and right.
However, according to the left and right arrangements described above, the power supply line connecting the fan inverter board 15 and the fan motors 8a1 and 8b1 and the power supply line connecting the compressor inverter board 16 and the compressor motor 10a, respectively, There is an advantage that it can be shortened.

As described above, the main control board 20 and the noise filter board 17 constituting the electrical component unit Y are disposed in the machine room 5. Electronic components for controlling signal system components are mounted on the main control board 20, and electronic components for removing noise of the three-phase AC power supply 40 are mounted on the noise filter substrate 17.

Each of the electronic components has a relatively small amount of heat generation, and each inverter board 15 and 16 having a large heat generation amount is accommodated in the heat exchange chamber 4 via the partition plate 3 and is accommodated in the machine chamber 5. These substrates 20 and 17 are not easily affected by heat.

Although the compressor 10 accommodated in the machine room 5 also generates heat with the action, the refrigeration cycle components 11 such as the refrigerant pipe 11a and the accumulator 11i are accommodated in the upper part. The main control board 20 and the noise filter board 17 are located above the refrigeration cycle components 11.

Moreover, the main control board 20 is fitted into the vertical base plate 25, and the noise filter board 17 is fitted into the inclined base plate 18. Therefore, these substrates 20 and 17 do not receive radiant heat directly from the compressor 10 and are hardly affected by radiant heat. The reliability of the electronic components mounted on the boards 20 and 17 can be maintained, and the occurrence of malfunctions can be prevented.

The four-way valve 11d constituting the refrigeration cycle component 11 was disposed on the back side of the main control board 20. Specifically, the main control board 20 is accommodated in a vertical posture on the upper front side of the machine room 5, and an inclined base plate 18 fitted with the noise filter substrate 17 is attached to the rear side in an oblique posture.

The back side of the base plate 18 is a deformed space, and the four-way valve 11d is accommodated here. Therefore, effective use of the deformed space can be achieved, and the increase in size of the outdoor unit main body 1 can be suppressed.

Further, the four-way valve 11d is disposed above the refrigeration cycle component 11 housed in the machine room 5. When liquid refrigerant stagnates and accumulates in the outdoor heat exchanger 7, if the four-way valve 11d is at a low position, the liquid refrigerant may flow backward and reach the four-way valve 11d.

When the four-way valve 11d is filled with liquid refrigerant, the resistance increases and the four-way valve 11d cannot be switched smoothly. In the present embodiment, since the four-way valve 11d is disposed above, it is difficult for the four-way valve 11d to be filled with the liquid refrigerant.

Furthermore, the refrigerant pipe 11a that communicates the four-way valve 11d and the discharge portion of the compressor 10 is once bent upward in an inverted U shape at a connection site with the four-way valve 11d. The bent portion height position of the refrigerant pipe 11a is higher than the upper end of the outdoor heat exchanger 7. Specifically, the bent portion height position of the refrigerant pipe 11a is set at a position higher than the uppermost stage of the heat exchange pipe constituting the outdoor heat exchanger 7.

When a large amount of liquid refrigerant that fills the entire outdoor heat exchanger 7 is accumulated (sleeps) while the refrigeration cycle operation is stopped, the liquid refrigerant is compressed beyond the height of the four-way valve 11d. It tries to flow backward to the discharge part of the machine 10.

If the check pipe 11c for preventing backflow is not provided in the refrigerant pipe 11a between the four-way valve 11d and the compressor 10, the liquid refrigerant enters the compressor 10 and causes liquid compression when the refrigeration cycle operation is restarted. The compression mechanism of the compressor 10 will be damaged.

Since the four-way valve 11d connecting portion of the refrigerant pipe 11a communicating the four-way valve 11d and the discharge portion of the compressor 10 is bent at a position higher than the upper end of the outdoor heat exchanger 7, the refrigeration cycle operation is stopped. The liquid refrigerant overflowing from the outdoor heat exchanger 7 into the four-way valve 11d does not cross the bent portion of the refrigerant pipe 11a from the four-way valve 11d. Therefore, backflow of the liquid refrigerant to the compressor 10 can be prevented with a very simple configuration without providing the check valve 11c in the refrigerant pipe 11a for cost reduction.

The above-described embodiments are presented as examples, and are not intended to limit the scope of the embodiments. The novel embodiment can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 3 ... Partition plate, 4 ... Heat exchange chamber, 5 ... Machine room, 1 ... Outdoor unit main body, 7 ... Outdoor heat exchanger, 8a, 8b ... Blower, 10 ... Compressor, 11a ... Refrigerant pipe, 11b ... Four-way valve, DESCRIPTION OF SYMBOLS 11i ... Accumulator, 11 ... Refrigeration cycle component, 16 ... Inverter board for compressors, 15 ... Inverter board for blowers, 23 ... First heat sink, 24 ... Second heat sink, 20 ... Main control board.

Claims (6)

An outdoor unit main body partitioned into a heat exchange chamber and a machine room by a partition plate;
A heat exchanger accommodated in the heat exchange chamber of the outdoor unit main body, a blower that guides external air from at least the back side of the outdoor unit main body to flow through the heat exchanger, and blows it to the outside of the front of the outdoor unit main body,
A compressor housed in a machine room of the outdoor unit body, and a refrigeration cycle component comprising a refrigerant pipe connected to the compressor and the heat exchanger, an accumulator, and the like;
An inverter board on which electrical components that drive and control electric components such as a compressor and a blower are mounted on the front side of the heat exchanger housed in the heat exchange chamber and above the blower, and
A heat sink attached to the back surface of the inverter board for cooling the electrical components mounted on the inverter board,
The outdoor unit of the refrigeration cycle apparatus, wherein the inverter board and the heat sink are supported by being tilted back and forth so that the upper end portions of the inverter board and the heat sink are located on the back side of the lower end portion. The inverter board is
An inverter board for a compressor on which electrical components for driving and controlling the compressor are mounted;
Including an inverter board for a blower on which electrical components for driving and controlling the blower are mounted,
A first heat sink that cools an electrical component mounted on the inverter board for the compressor, and a second heat sink that cools an electrical component mounted on the inverter board for the blower. The outdoor unit of the refrigeration cycle apparatus according to 1. The outdoor unit of the refrigeration cycle apparatus according to claim 2, wherein the compressor inverter board and the blower inverter board are arranged side by side with each other. The outdoor unit of the refrigeration cycle apparatus according to claim 1, wherein the machine room accommodates a main control board on which electrical components for controlling the outdoor unit are mounted. The refrigeration cycle component comprises a four-way valve,
The outdoor unit of the refrigeration cycle apparatus according to claim 4, wherein the main control board is accommodated on an upper front side of the machine room, and the four-way valve is disposed on a rear side of the main control board. The refrigerant pipe which connects the said four-way valve and the discharge part of the said compressor is bent in the position higher than the upper end of the heat exchanger arrange | positioned in the said heat exchange chamber. Outdoor unit of refrigeration cycle equipment.

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