WO2024069667A1 - 空気調和機 - Google Patents

空気調和機 Download PDF

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Publication number
WO2024069667A1
WO2024069667A1 PCT/JP2022/035564 JP2022035564W WO2024069667A1 WO 2024069667 A1 WO2024069667 A1 WO 2024069667A1 JP 2022035564 W JP2022035564 W JP 2022035564W WO 2024069667 A1 WO2024069667 A1 WO 2024069667A1
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WO
WIPO (PCT)
Prior art keywords
control box
heat exchanger
water
plate
box body
Prior art date
Application number
PCT/JP2022/035564
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
雄介 山内
卓也 村上
遼太 福田
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2024548800A priority Critical patent/JPWO2024069667A1/ja
Priority to PCT/JP2022/035564 priority patent/WO2024069667A1/ja
Publication of WO2024069667A1 publication Critical patent/WO2024069667A1/ja

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/20—Electric components for separate outdoor units
    • F24F1/22—Arrangement or mounting thereof

Definitions

  • This disclosure relates to an air conditioner equipped with a control box.
  • Patent Document 1 discloses an air conditioner in which the control box is arranged in the secondary side area of the heat exchanger in the air flow. During maintenance, the user sprays water on the primary side area of the heat exchanger in the air flow to wash it. In Patent Document 1, the control box is arranged in the secondary side area of the heat exchanger, so it does not hinder the user's cleaning operation.
  • This disclosure has been made to solve the problems described above, and provides an air conditioner that prevents water from entering the control box when cleaning the secondary area of the heat exchanger.
  • the air conditioner of the present disclosure comprises a housing that forms the outer shell, a heat exchanger provided inside the housing, a blower that sends air to the heat exchanger, and a control box that is provided in the secondary side area after the air sent to the primary side area of the heat exchanger by the blower passes through the heat exchanger and to which wiring is connected.
  • the control box forms the outer shell and has a box body that has an opening on the first direction side of the primary side area of the heat exchanger, and a cover that is provided on the first direction side and closes the opening of the box body.
  • the cover has a plate-shaped plate that extends in the vertical direction and an L-shaped water barrier that is provided at the upper end of the plate and prevents water from entering the box body.
  • the cover of the control box has an L-shaped water barrier that prevents water from entering the box body. Therefore, when a user cleans the secondary area of the heat exchanger, even if water heads toward the control box, the water hits the water barrier and does not enter the inside of the control box. Therefore, even if a user cleans the secondary area of the heat exchanger, water can be prevented from entering the inside of the control box.
  • FIG. 1 is a circuit diagram showing an air conditioner according to a first embodiment.
  • FIG. 2 is a perspective view showing the indoor unit according to the first embodiment.
  • FIG. 2 is a perspective view showing the indoor unit according to the first embodiment with the front panel removed.
  • FIG. 2 is a perspective view showing a secondary side region of the heat exchanger according to the first embodiment.
  • FIG. 2 is a perspective view showing a control box according to the first embodiment.
  • FIG. 2 is a perspective view showing a state in which a cover is removed in the control box of the first embodiment.
  • FIG. 2 is a perspective view showing a state in which a control box is pulled out in the indoor unit according to the first embodiment.
  • 2 is a perspective view of the top surface of the control box according to the first embodiment when viewed from below.
  • FIG. 2 is an exploded perspective view of a top surface and a cover of the control box according to the first embodiment when viewed from above.
  • FIG. 2 is an exploded perspective view of a top surface and a cover of the control box according to the first embodiment when viewed from below.
  • FIG. 4 is an assembled perspective view of the top surface and cover of the control box according to the first embodiment when viewed from below.
  • FIG. FIG. 4 is a perspective view showing a drainage path of the control box according to the first embodiment.
  • Fig. 1 is a circuit diagram showing an air conditioner 1 according to embodiment 1.
  • the air conditioner 1 is a device that adjusts the air in a space to be air-conditioned, and as shown in Fig. 1, includes an outdoor unit 2 and an indoor unit 3.
  • the outdoor unit 2 includes, for example, a compressor 6, a flow path switching device 7, an outdoor heat exchanger 8, an outdoor blower 9, an expansion section 10, and a control box 13.
  • the indoor unit 3 includes, for example, a heat exchanger 11 and a blower 12.
  • the refrigerant circuit 4 is formed by connecting the compressor 6, the flow path switching device 7, the outdoor heat exchanger 8, the expansion section 10, and the heat exchanger 11 with the refrigerant piping 5.
  • the compressor 6 draws in refrigerant in a low-temperature and low-pressure state, compresses the drawn refrigerant, and discharges it as refrigerant in a high-temperature and high-pressure state.
  • the compressor 6 is, for example, a capacity-controllable inverter compressor.
  • the flow path switching device 7 switches the direction in which the refrigerant flows in the refrigerant circuit 4, and is, for example, a four-way valve.
  • the outdoor heat exchanger 8 exchanges heat between, for example, outdoor air and the refrigerant.
  • the outdoor heat exchanger 8 acts as a condenser during cooling operation and as an evaporator during heating operation.
  • the expansion section 10 is a pressure reducing valve or an expansion valve that reduces the pressure of the refrigerant and expands it.
  • the expansion section 10 is, for example, an electronic expansion valve whose opening is adjustable.
  • the heat exchanger 11 exchanges heat between, for example, indoor air and a refrigerant.
  • the heat exchanger 11 acts as an evaporator during cooling operation and as a condenser during heating operation.
  • the blower 12 is a device that sends indoor air to the heat exchanger 11.
  • cooling operation Next, the operation modes of the air conditioner 1 will be described.
  • the cooling operation In the cooling operation, the refrigerant sucked into the compressor 6 is compressed by the compressor 6 and discharged in a high-temperature, high-pressure gas state.
  • the high-temperature, high-pressure gas state refrigerant discharged from the compressor 6 passes through the flow path switching device 7 and flows into the outdoor heat exchanger 8 acting as a condenser, where it is heat exchanged with the outdoor air sent by the outdoor blower 9, condensing and liquefying.
  • the condensed liquid state refrigerant flows into the expansion section 10, where it is expanded and decompressed to become a low-temperature, low-pressure gas-liquid two-phase refrigerant.
  • the gas-liquid two-phase refrigerant then flows into the heat exchanger 11 acting as an evaporator, where it is heat exchanged with the indoor air sent by the blower 12, evaporating and gasifying. At this time, the indoor air is cooled, and cooling is performed in the room.
  • the evaporated low-temperature, low-pressure gas state refrigerant passes through the flow path switching device 7 and is sucked into the compressor 6.
  • the heating operation In the heating operation, the refrigerant sucked into the compressor 6 is compressed by the compressor 6 and discharged in a high-temperature, high-pressure gas state.
  • the high-temperature, high-pressure gas state refrigerant discharged from the compressor 6 passes through the flow path switching device 7 and flows into the heat exchanger 11 acting as a condenser, where it is heat exchanged with the indoor air sent by the blower 12, condensed and liquefied. At this time, the indoor air is warmed, and heating is performed in the room.
  • the condensed liquid state refrigerant flows into the expansion section 10, where it is expanded and decompressed to become a low-temperature, low-pressure gas-liquid two-phase refrigerant.
  • the gas-liquid two-phase refrigerant then flows into the exterior heat exchanger 8 acting as an evaporator, where it is heat exchanged with the outdoor air sent by the exterior blower 9, evaporating and gasifying.
  • the evaporated low-temperature, low-pressure gas state refrigerant passes through the flow path switching device 7 and is sucked into the compressor 6.
  • the air conditioner 1 does not have to have a flow path switching device 7. In this case, the air conditioner 1 becomes a dedicated cooling unit or a dedicated heating unit.
  • FIG. 2 is a perspective view showing the indoor unit 3 according to the first embodiment
  • Fig. 3 is a perspective view showing the indoor unit 3 according to the first embodiment with the front plate 21 removed.
  • the indoor unit 3 includes a housing 20 constituting an outer shell, a heat exchanger 11, a blower 12, a drain pan 24 for collecting condensed water from the heat exchanger 11, and a control box 13.
  • the indoor unit 3 takes in air from an intake port 21a formed in the front plate 21 of the housing 20 (white arrow in Figs. 2 and 3).
  • the heat exchanger 11 is disposed inside the intake port 21a.
  • an air passage is formed from the intake port 21a formed in the front plate 21 to the exhaust port 23a formed in the top plate 23.
  • the air taken into the housing 20 passes through the heat exchanger 11, is conditioned, and is blown out from the exhaust port 23a formed in the top plate 23 of the housing 20 (indicated by the white arrow in FIG. 3).
  • Both sides of the housing 20 are side panels 22, and the rear of the housing 20 is a rear panel 25.
  • the side of the housing 20 where the front plate 21 is located is called the front side
  • the side facing the front plate 21 is called the rear side.
  • the left and right sides of the housing 20 correspond to the left and right when the housing 20 is viewed from the front plate 21.
  • the x direction which is the positive direction of the x axis, is the right, and the opposite direction along the x axis is the left.
  • the direction parallel to the plane defined by the xz axes is the horizontal direction, and the y direction is the up direction.
  • the z direction is called the first direction.
  • the heat exchanger 11 is disposed on the rear side of the intake port 21a when viewed from the side where the front panel 21 of the housing 20 is disposed.
  • the blower 12 includes two blowers 12, and is disposed above the heat exchanger 11, and is located between the outlet 23a and the heat exchanger 11.
  • the blower 12 is connected to a fan 12b (see FIG. 4) and a motor 12c (see FIG. 4), and the motor 12c is inverter-controlled to drive the fan 12b.
  • the air flowing in from the intake port 21a passes through the heat exchanger 11 disposed at an incline inside the housing 20 and flows upward inside the housing 20.
  • the air that has passed through the heat exchanger 11 flows into the inside of the fan casing 12a of the blower 12, and is blown out from the outlet 23a by the fan 12b.
  • the drain pan 24 is disposed so as to collect drain water flowing down below the heat exchanger 11 disposed at an incline inside the housing 20.
  • fan 12b is a sirocco fan.
  • FIG. 4 is a perspective view showing the secondary side region of the heat exchanger 11 according to the first embodiment.
  • the secondary side region of the heat exchanger 11 means the region inside the housing 20 where air that has passed through the heat exchanger 11 exists.
  • the primary side region of the heat exchanger 11 means the region where air exists before passing through the heat exchanger 11. In other words, the primary side region is the region upstream of the heat exchanger 11 in the air passage inside the housing 20.
  • the secondary side region is the region downstream of the heat exchanger 11 in the air passage inside the housing 20.
  • a motor 12c In the secondary side area of the heat exchanger 11, a motor 12c, a fan 12b directly connected to the motor 12c, and a fan casing 12a fixed to the top plate 23 to cover the periphery of the fan 12b are installed.
  • two blowers 12 are arranged in the x direction.
  • the control box 13 is arranged in the horizontal direction of the blowers 12, i.e., along the x axis, together with the blowers 12. Since the control box 13 is arranged on the side of the blowers 12, when removing the front plate 21 to perform maintenance around the blowers 12, it is not necessary to remove the control box 13 from the air conditioner 1, improving the workability of maintenance.
  • the fan casing 12a is configured to be freely removable by dividing it in the front-rear direction of the air conditioner 1, so that maintenance such as cleaning of the internal fan 12b is possible.
  • the front-rear direction of the air conditioner 1 is the direction along the z axis shown in FIG. 2.
  • the drain pan 24 is disposed in the primary side area of the heat exchanger 11.
  • the heat exchanger 11 and the drain pan 24 are prone to dust and dirt due to condensed water. Therefore, the primary side area of the heat exchanger 11 is frequently cleaned. If the control box 13 is disposed above the drain pan 24 in the primary side area of the heat exchanger 11 in the indoor unit 3, the control box 13 will hinder the cleaning of the heat exchanger 11 and the drain pan 24, making the cleaning work complicated. In addition, if a large amount of cleaning water is applied to the control box 13 during the cleaning work, the water will enter the inside of the control box 13. This will cause the air conditioner 1 to break down, so it is necessary to protect the control box 13 during the cleaning work.
  • the control box 13 according to the first embodiment is disposed in the secondary side area rather than the primary side area where cleaning is frequent, and this makes it easier to perform maintenance work on the air conditioner 1.
  • the control box 13 is disposed in the secondary side area, which also increases the cooling efficiency.
  • FIG. 5 is a perspective view showing the control box 13 according to the first embodiment
  • FIG. 6 is a perspective view showing the control box 13 according to the first embodiment with the cover 31 removed.
  • the control box 13 is L-shaped when viewed from the top surface side of the indoor unit 3.
  • the control box 13 is L-shaped, and the front area in the z direction is wider in the x direction than the back area in the z direction. Therefore, in the control box 13, boards that are often operated at the site where the air conditioner 1 is installed are arranged at the front side of the control box 13, and boards that are not operated at the site are arranged at the back side.
  • the air conditioner 1 can achieve space saving in the arrangement of the control box 13 within the housing 20.
  • the terminal block 35 to which the wiring connecting to the outside of the control box 13 and the wiring connecting to each board are connected is arranged in the front area of the control box 13 in the z direction.
  • a heat sink 33 is installed on the side surface 32 of the control box 13 facing the blower 12. Since the heat sink 33 is installed on the side surface 32 close to the blower 12, a part of the air flowing toward the blower 12 can be directed to the heat sink 33. This allows the inverter board (not shown) installed inside the control box 13 to be cooled. In addition, the heat sink 33 can also be washed when cleaning the area around the blower 12. This prevents the cooling effect from decreasing due to dirt accumulating on the heat sink 33.
  • the box body 30 is a box body made of, for example, a combination of sheet metal members. The box body 30 has gaps around the heat sink 33 filled with silicon caulking to prevent water from entering. This allows the heat sink 33 installed on the outside of the box body 30 made of a combination of sheet metal members to be washed. The box body 30 has an opening on the first direction side. The white arrow in FIG. 5 indicates the direction in which water is discharged during cleaning.
  • the terminal block mounting section 36 is fixed to the box body 30 with screws, and is configured to be freely attached and detached from the box body 30. Furthermore, the wiring connecting the terminal block 35 and the circuit boards inside the control box 13 is connected by a connector, and is removable from at least one of the terminal block 35 and the circuit boards.
  • the left side panel 37 is screwed to the box body 30 and is removable. Furthermore, the internal wiring is made to be of a length with excess wires so that no tension is applied when removed.
  • FIG. 7 is a perspective view showing the indoor unit 3 according to embodiment 1 with the control box 13 pulled out.
  • the control box 13 has a sliding structure that allows it to slide in the front-to-rear direction of the housing 20, i.e., along the z-axis. Therefore, during maintenance, the control box 13 can be pulled out in the front direction of the housing 20 with the front panel 21 removed.
  • control box 13 By making the control box 13 slidable in the front-to-rear direction of the housing 20, workers can perform maintenance on the circuit board without removing the control box 13 from the indoor unit 3.
  • the front panel 21 of the housing 20 is removed to view the inside of the housing 20, it is possible to clean the area hidden by the control box 13.
  • the control box 13 when the control box 13 is pulled out towards the front in the z direction, the control box 13 can be fixed in place by tightening the screws (not shown) of the slide rails (not shown) that were loosened. This eliminates the need to prepare a separate stand or the like to fix the control box 13 during maintenance.
  • the control box 13 When the screws that secure the terminal block mounting portion 36 to the box body 30 and the connectors that connect the terminal block 35 to other circuit boards inside the control box 13 are removed, the control box 13 can be pulled out towards you along the slide rails 34 without removing the wiring from the terminal block 35.
  • the left side panel 37 is screwed to the box body 30.
  • the left side of the control box 13 can be opened. Opening the left side of the control box 13 while the control box 13 is pulled out makes it easier to access the circuit boards inside the control box 13, improving the workability of maintenance of the control box 13.
  • Sealing material 50 is applied to the mating surfaces between the terminal block mounting portion 36 of the control box 13 and the box body 30, between the left side panel 37 and the box body 30, and between the cover 31 and the box body 30.
  • the sealing material 50 prevents water from entering the inside of the control box 13 even if water gets on the control box 13 when cleaning the blower 12.
  • a rubber bushing shaped to encase the wiring is disposed in the wiring inlet 38 of the control box 13.
  • the rubber bushing with the wiring passing through it is tied around its outer periphery with a bundling member to prevent water, debris, etc. from entering the control box 13 through the wiring inlet 38.
  • Figure 8 is an oblique view of the top surface of the control box 13 in embodiment 1 as viewed from below.
  • an elastic sealant 50 is attached to the mating surfaces of the box body 30 and the cover 31. This allows the seal to be maintained even if the cover 31 is attached and detached from the box body 30 multiple times during maintenance.
  • FIG. 9 is an exploded perspective view of the top surface and cover 31 of the control box 13 according to embodiment 1 as viewed from above
  • FIG. 10 is an exploded perspective view of the top surface and cover 31 of the control box 13 according to embodiment 1 as viewed from below.
  • the cover 31 of the control box 13 will be described in detail.
  • the cover 31 has a plate body 40 and a water shielding plate 42, and covers the opening of the box body 30.
  • the plate body 40 is a plate-like member that extends in the vertical direction and has a rectangular shape.
  • the plate body 40 also has a flange 41 whose upper end extends in the first direction.
  • the flange 41 is provided at the upper end of the plate body 40 across the entire width of the plate body 40.
  • the water shielding plate 42 is an L-shaped member provided at the upper end of the plate body 40, and prevents water from entering the box body 30.
  • the water shielding plate 42 in this embodiment 1 is integrally provided with a plate-shaped mounting portion 44 extending downward from the lower end of the water shielding plate 42, and the water shielding plate 42 is attached to the plate body 40 by welding the mounting portion 44 to the plate body 40.
  • the mounting portion 44 is shorter than the width of the water shielding plate 42 and is positioned to one side, but the length and position of the mounting portion 44 can be changed as appropriate.
  • the water shielding plate 42 is also formed with three drainage holes 43 for draining accumulated water.
  • the number of drainage holes 43 is not limited to three, and may be less than three or more than three.
  • Figure 11 is an assembled perspective view of the top surface and cover 31 of the control box 13 according to embodiment 1, viewed from below.
  • the flange 41 pushes up the sealing material 50 from below. This improves the sealing performance of the sealing material 50.
  • by covering the sealing material 50 with the water shielding plate 42 even if water gets on the control box 13, it prevents the water from getting on the seal. Any water that gets between the water shielding plate 42 and the plate body 40 is drained to the outside through the water drainage hole 43.
  • Figure 12 is a perspective view showing the drainage path of the control box 13 in embodiment 1.
  • water flowing from the top surface of the control box 13 is guided to the water barrier plate 42 and drained from the water drainage hole 43. This prevents the cleaning water from getting on the sealing material 50.
  • the water since the water does not accumulate near the control box 13 but is drained to the outside, it is also possible to save the trouble of wiping off the cleaning water that has adhered to the control box 13.
  • the cover 31 of the control box 13 has an L-shaped water shield 42 that prevents water from entering the box body 30. Therefore, when a user cleans the secondary area of the heat exchanger 11, even if the water is directed toward the control box 13, the water hits the water shield 42. Therefore, even if a user cleans the secondary area of the heat exchanger 11, water can be prevented from entering the inside of the control box 13.
  • the water shielding plate 42 is also formed with drainage holes 43 for draining accumulated water. Therefore, water that has entered between the water shielding plate 42 and the plate body 40 is discharged to the outside through the drainage holes 43. Furthermore, the plate body 40 has a flange 41 whose upper end extends in the first direction. The flange 41 has a return structure relative to the plate body 40, making it difficult for water to enter the inside of the control box 13. Furthermore, when the cover 31 is attached to the box body 30, the flange 41 pushes up the sealing material 50 from below. This improves the sealing performance of the sealing material 50.
  • An elastic sealant 50 is attached to the mating surfaces of the box body 30 and the cover 31. This allows the seal to be maintained even if the cover 31 is removed and attached multiple times from the box body 30 during maintenance.
  • control box 13 may be provided in the indoor unit 3 or in an external unit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
PCT/JP2022/035564 2022-09-26 2022-09-26 空気調和機 WO2024069667A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2024548800A JPWO2024069667A1 (enrdf_load_stackoverflow) 2022-09-26 2022-09-26
PCT/JP2022/035564 WO2024069667A1 (ja) 2022-09-26 2022-09-26 空気調和機

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/035564 WO2024069667A1 (ja) 2022-09-26 2022-09-26 空気調和機

Publications (1)

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WO2024069667A1 true WO2024069667A1 (ja) 2024-04-04

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PCT/JP2022/035564 WO2024069667A1 (ja) 2022-09-26 2022-09-26 空気調和機

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JP (1) JPWO2024069667A1 (enrdf_load_stackoverflow)
WO (1) WO2024069667A1 (enrdf_load_stackoverflow)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60173874U (ja) * 1984-04-23 1985-11-18 ダイキン工業株式会社 冷凍装置の電装箱
JP2003139352A (ja) * 2001-11-02 2003-05-14 Daikin Ind Ltd 室外機用電装品ユニット及び空気調和機の室外機
JP2008281286A (ja) * 2007-05-11 2008-11-20 Hitachi Appliances Inc 空気調和機の室外機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60173874U (ja) * 1984-04-23 1985-11-18 ダイキン工業株式会社 冷凍装置の電装箱
JP2003139352A (ja) * 2001-11-02 2003-05-14 Daikin Ind Ltd 室外機用電装品ユニット及び空気調和機の室外機
JP2008281286A (ja) * 2007-05-11 2008-11-20 Hitachi Appliances Inc 空気調和機の室外機

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