JP5304881B2 - Refrigeration unit outdoor unit - Google Patents

Description

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

  In an outdoor unit of a refrigeration apparatus, for example, as in Patent Document 1 (Japanese Patent Application Laid-Open No. 2010-112645), there is a known example in which the outer surface of a steel plate casing is coated for the purpose of preventing deterioration of the appearance.

  However, the inner surface of a casing made of a non-coated steel sheet may be corroded by rainwater or dew condensation water that has entered from the outside of the casing, which may affect the durability of the outdoor unit of the refrigeration apparatus. In particular, when heat exchangers made of aluminum or aluminum alloys are used in a refrigeration system, aluminum is liable to cause different metal contact corrosion with iron, so the heat exchanger is damaged by iron ions eluted from the corroded casing. The present inventor has found that this is possible.

  An object of the present invention is to provide an outdoor unit of a refrigeration apparatus that is less susceptible to metal corrosion in an outdoor unit of a refrigeration apparatus that uses a heat exchanger made of aluminum or aluminum alloy.

The outdoor unit of the refrigeration apparatus according to the first aspect of the present invention is an outdoor unit of the refrigeration apparatus, and includes a steel casing and a heat exchanger made of aluminum or aluminum alloy. The casing includes a top plate. The casing further includes an adjacent side plate disposed adjacent to the heat exchanger, and a side plate other than the adjacent side plate. The top plate is painted on the lower and upper surfaces. The adjacent side plates are painted on the inner and outer surfaces. Side plate except adjacent side plate inner surface at unpainted, only the outer surface is painted.

  Here, the bottom surface of the steel top plate is painted, so even if water adheres to the bottom surface of the top plate due to rain or condensation, it is difficult to corrode. Ion elution can be suppressed. Therefore, it can suppress that the water droplet containing an iron ion falls from a top plate, and corrosion generate | occur | produces in the heat exchanger made from aluminum or an aluminum alloy.

  In the outdoor unit of the refrigeration apparatus according to the present invention, the casing further includes an adjacent side plate disposed adjacent to the heat exchanger. The inner surface of the adjacent side plate is painted.

  Here, the inner surface of the adjacent side plate disposed adjacent to the heat exchanger is also coated, and the inner surface of the adjacent side plate is hardly corroded. Therefore, it is possible to prevent a situation where rainwater containing iron ions eluted from the inner surface of the adjacent side plate adheres to the heat exchanger made of aluminum or aluminum alloy, and corrosion of the heat exchanger hardly occurs.

  In addition, there is a possibility that the adjacent side plate and the heat exchanger come into contact with each other due to vibration during the transfer of the outdoor unit, but even if the adjacent side plate and the heat exchanger are in contact with each other, Since the heat exchanger is not in direct contact, the heat exchanger is less likely to be damaged by corrosion.

  In the outdoor unit of the refrigeration apparatus according to the second aspect of the present invention, the distance between the heat exchanger and the adjacent side plate is 10 mm or less in the outdoor unit of the refrigeration apparatus according to the first aspect.

  Here, even when the distance between the heat exchanger and the adjacent side plate is 10 mm or less, the heat exchanger is not easily damaged by corrosion.

  In the outdoor unit of the refrigeration apparatus according to the third aspect of the present invention, in the outdoor unit of the refrigeration apparatus according to the first aspect or the second aspect, the casing further includes a bottom frame disposed at the bottom of the casing. At least the bottom frame is a Zn—Al—Mg—Si plated steel plate.

  Here, even if the coating film is damaged or deteriorated for some reason, the bottom frame is highly likely to come into contact with water by using a highly corrosion-resistant Zn-Al-Mg-Si plated steel plate for the bottom frame. The inner surface of is hard to corrode. Thereby, the corrosion resistance of the outdoor unit of the refrigeration apparatus can be improved.

  In the outdoor unit of the refrigeration apparatus according to the first aspect of the present invention, since the bottom surface of the steel top plate is painted, even if water adheres to the bottom surface of the top plate due to the influence of rain or condensation. It is difficult to corrode, and iron ion elution from the top plate accompanying corrosion can be suppressed. Therefore, it can suppress that the water droplet containing an iron ion falls from a top plate, and corrosion generate | occur | produces in the heat exchanger made from aluminum or an aluminum alloy.

  In the outdoor unit of the refrigeration apparatus according to the second aspect of the present invention, corrosion hardly occurs in the heat exchanger.

  In the outdoor unit of the refrigeration apparatus according to the third aspect of the present invention, the bottom frame is hardly corroded, and the corrosion resistance of the outdoor unit of the refrigeration apparatus can be improved.

1 is a schematic refrigerant circuit diagram of an air conditioner in which an outdoor unit of a refrigeration apparatus according to an embodiment of the present invention is employed. It is a schematic perspective view of the outdoor unit of the freezing apparatus which concerns on one Embodiment of this invention. It is a schematic top view in the state where the top plate of the outdoor unit of the refrigeration apparatus concerning one embodiment of the present invention was removed. It is a schematic perspective view of an outdoor heat exchanger. It is the elements on larger scale when the flat porous tube and the insertion fin of an outdoor heat exchanger are cut | disconnected in the perpendicular direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The outdoor unit of the refrigeration apparatus of this embodiment is used as an outdoor unit of an air conditioner.

(1) Overview of Air Conditioner (1-1) Overall Configuration The air conditioner 1 is a so-called separate type air conditioner, and as shown in FIG. 1, an outdoor unit 20, an indoor unit 40, and an outdoor unit. 20 and a liquid refrigerant communication pipe 71 and a gas refrigerant communication pipe 72 for connecting the indoor unit 40 to the indoor unit 40.

(1-2) Indoor unit The indoor unit 40 is installed in the room which is the object of air conditioning. The indoor unit 40 mainly includes an indoor heat exchanger 41 and an indoor fan 42.

  The indoor heat exchanger 41 is a cross-fin type fin-and-tube heat exchanger composed of heat transfer tubes and a large number of heat transfer fins. During cooling operation, it functions as a refrigerant evaporator to cool indoor air, and during heating operation, it functions as a refrigerant condenser to heat indoor air. The liquid side of the indoor heat exchanger 41 is connected to the liquid refrigerant communication pipe 71, and the gas side of the indoor heat exchanger 41 is connected to the gas refrigerant communication pipe 72.

  The indoor fan 42 is rotated by a motor (not shown), takes in indoor air, blows it to the indoor heat exchanger 41, and promotes heat exchange between the indoor heat exchanger 41 and the indoor air.

(1-3) Outdoor Unit FIG. 2 shows a schematic perspective view of the outdoor unit 20. The outdoor unit 20 is installed outdoors. The outdoor unit 20 mainly includes an accumulator 21, a compressor 23, a four-way switching valve 24, an outdoor heat exchanger 25, an expansion valve 26, a liquid side closing valve 27, a gas side closing valve 28, and an outdoor fan 35. Within 50. The accumulator 21, the compressor 23, the four-way switching valve 24, the outdoor heat exchanger 25, the expansion valve 26, the liquid side closing valve 27, and the gas side closing valve 28 are connected by a refrigerant pipe. Connection by refrigerant piping will be described later.

  In addition, as shown in FIG. 3, the blower outlet 51a of the air blown from the outdoor fan 35 is formed in the front plate 51 of the casing 50 arrange | positioned at the blowing side of the outdoor fan 35. As shown in FIG. The blower outlet 51a is a circular opening. A bell mouth 65 protruding toward the inside of the casing 50 is provided from the peripheral edge of the opening of the air outlet 51a. A fan grill 60 that covers the entire outlet 51a is attached to the outside of the casing 50 of the outlet 51a.

(2) Detailed description of outdoor unit In the following description, expressions indicating directions such as “up”, “down”, “left”, “right”, “front”, “rear”, “front”, “back”, etc. However, unless otherwise specified, the front plate 51 on which the fan grill 60 is disposed is the front of the outdoor unit 20, and the direction when viewed from the front side is shown.

(2-1) Connection by Refrigerant Pipe The suction port of the compressor 23 and the four-way switching valve 24 are connected by a suction pipe 81. The suction pipe 81 is provided with an accumulator 21 between the suction port of the compressor 23 and the four-way switching valve 24. The discharge port of the compressor 23 and the four-way switching valve 24 are connected by a discharge pipe 82. The four-way switching valve 24 and the gas side of the outdoor heat exchanger 25 are connected by a first gas refrigerant pipe 83. The outdoor heat exchanger 25 and the liquid side closing valve 27 are connected by a liquid refrigerant pipe 84. The liquid refrigerant pipe 84 is provided with an expansion valve 26 between the outdoor heat exchanger 25 and the liquid side closing valve 27. The liquid side closing valve 27 is connected to the liquid refrigerant communication pipe 71. The four-way switching valve 24 and the gas side closing valve 28 are connected by a second gas refrigerant pipe 85. The gas side closing valve 28 is connected to the gas refrigerant communication pipe 72.

(2-2) Compressor The compressor 23 sucks in the gas refrigerant and compresses the gas refrigerant. The compressor 23 is a positive displacement compressor.

(2-3) Four-way switching valve The four-way switching valve 24 switches the flow direction of the refrigerant when the air-conditioning apparatus 1 is switched between the cooling operation and the heating operation. During the cooling operation, the discharge pipe 82 and the first gas refrigerant pipe 83 are connected, and the suction pipe 81 and the second gas refrigerant pipe 85 are connected. On the other hand, during the heating operation, the discharge pipe 82 and the second gas refrigerant pipe 85 are connected, and the suction pipe 81 and the first gas refrigerant pipe 83 are connected.

(2-4) Accumulator The accumulator 21 has a gas-liquid separation function for separating the refrigerant into a gas phase and a liquid phase. The refrigerant flowing into the accumulator 21 is separated into a liquid phase and a gas phase, and the gas phase refrigerant that collects in the upper space is supplied to the compressor 23.

(2-5) Outdoor heat exchanger The outdoor heat exchanger 25 condenses or evaporates the refrigerant flowing inside through heat exchange with outdoor air. All of the outdoor heat exchangers 25 are made of aluminum or aluminum alloy. The outdoor heat exchanger 25 is separated from the steel member including the casing 50 directly by leaving an appropriate space with the steel member, or the resin member is replaced with the steel member and the outdoor heat exchanger 25. And placed in the casing 50.

  Outdoor air taken in from the outside of the casing 50 by an outdoor fan 35 described later passes through the outdoor heat exchanger 25 and is then discharged from the air outlet 51a formed in the casing 50 to the outside of the casing.

  The outdoor heat exchanger 25 includes a flat porous tube 93, insertion fins 94, and headers 91 and 92. FIG. 4 is a schematic perspective view of the outdoor heat exchanger 25.

  As shown in FIG. 3, the outdoor heat exchanger 25 extends to the left from the vicinity of an end portion of a partition plate 58 to be described later along the back side of the casing 50, and changes its direction near the left rear corner of the casing 50. , And extends forward along a left side plate 54 described later.

  FIG. 5 is a partially enlarged view when the flat porous tube 93 and the insertion fin 94 are cut in the vertical direction. The flat porous tube 93 has upper and lower flat portions serving as heat transfer surfaces and a plurality of internal flow passages 93a through which the refrigerant flows. The flat perforated pipes 93 are arranged in a plurality of stages at intervals in a state where the plane portion is directed up and down. The insertion fin 94 is a fin having the shape shown in FIG. 5 and is in contact with the flat porous tube 93. The insertion fin 94 is formed with a plurality of notches 94a extending horizontally so that the insertion fin 94 can be inserted into a plurality of flat porous tubes 93 arranged between the headers 91 and 92. ing. The shapes of the notches 94a of these insertion fins 94 substantially match the outer shape of the cross section of the flat porous tube 93, as shown in FIG.

  The headers 91 and 92 are connected to both ends of flat porous tubes 93 arranged in a plurality of stages in the vertical direction. The headers 91 and 92 have a function of supporting the flat porous tube 93, a function of guiding the refrigerant to the internal flow passage 93a of the flat porous tube 93, and a function of collecting the refrigerant that has come out of the internal flow passage 93a. Yes.

(2-6) Expansion Valve The expansion valve 26 is provided for adjusting the refrigerant pressure and the refrigerant flow rate, and has a function of expanding the refrigerant in both the cooling operation and the heating operation.

(2-7) Closing Valve The liquid side closing valve 27 and the gas side closing valve 28 are connected to the liquid refrigerant communication pipe 71 and the gas refrigerant communication pipe 72, respectively. During normal operation, both shut-off valves 27 and 28 are open.

(2-8) Outdoor Fan The outdoor fan 35 is a fan that blows air horizontally. The outdoor fan 35 is rotated by a motor 35 a and takes in outdoor air from the outside of the casing 50. The taken outdoor air passes through the outdoor heat exchanger 25, and is then discharged out of the casing 50 through the air outlet 51 a formed in the casing 50. That is, as the outdoor fan 35 rotates, the air moves approximately as shown by the arrows in FIG.

(2-9) Casing The casing 50 includes a left casing member 151, a bottom plate 52, a right front plate 55, a right rear plate 56, a top plate 57, and a partition plate 58 in which a front plate 51 and a left side plate 54 are integrally formed. Composed.

(2-9-1) Casing Material and Coating For the left casing member 151, the right front plate 55, the right rear plate 56, the top plate 57, and the partition plate 58, hot dip galvanized steel plates are used. For the bottom plate 52, a Zn—Al—Mg—Si plated steel plate is used. Specifically, a Zn-11% Al-3% Mg-0.2% Si plated steel plate is used for the bottom plate 52.

  The outer surfaces of the left casing member 151, the right front plate 55, and the right rear plate 56 are coated for rust prevention. The top plate 57 has an outer surface and an inner surface (upper surface and lower surface) coated for rust prevention. For coating, for example, a polyester resin paint, an epoxy resin paint, or a fluororesin paint is used. The bottom plate 52 and the partition plate 58 are not painted.

(2-9-2) Left casing member The left casing member 151 is a plate-like member formed in a substantially L shape in plan view, and the front plate 51 and the left side plate 54 are integrally formed. The left casing member 151 extends substantially vertically upward from the bottom plate 52 to the top plate 57. The left casing member 151, the bottom plate 52, and the top plate 57 are each fixed by screws or the like.

  The front plate 51 is a plate-like member that forms the left front of the casing 50. The front plate 51 is formed with an air outlet 51 a for blowing air from the outdoor fan 35. The blower outlet 51a is a circular opening. A bell mouth 65 protruding toward the inside of the casing 50 is provided from the peripheral edge of the opening of the air outlet 51a. A fan grill 60 is attached to the outside of the casing 50 of the air outlet 51a.

  The left side plate 54 is a member constituting the left side surface of the casing 50 and faces a portion extending in the front-rear direction of the outdoor heat exchanger 25. The minimum distance between the left side plate 54 and the outdoor heat exchanger 25 is 10 mm or less. The left side plate 54 is formed with a suction port 54 a for air sucked into the casing 50 by the outdoor fan 35.

(2-9-3) Bottom Plate The bottom plate 52 is a substantially rectangular plate-like member that constitutes the lower surface of the casing 50. A bent portion (not shown) extending upward is provided at the peripheral edge of the bottom plate 52. The left casing member 151, the right front plate 55, the right rear plate 56, and the partition plate 58 are fixed to the bent portion with screws or the like.

(2-9-4) Right Front Plate The right front plate 55 is a plate-like member that constitutes the front part of the right front surface and the right side surface of the casing 50. The right front plate 55 extends substantially vertically upward from the bottom plate 52 to the top plate 57, and is fixed to the bottom plate 52 with screws or the like. Further, the left end portion of the right front plate 55 is fixed to the right end portion of the front plate 51 of the left casing member 151 by screws or the like.

(2-9-5) Right rear plate The right rear plate 56 is a plate-like member that configures the right rear surface and the rear portion of the right side surface of the casing 50. The right rear plate 56 extends substantially vertically upward from the bottom plate 52 to the top plate 57, and is fixed to the bottom plate 52 and the top plate 57 by screws or the like. Between the rear end portion of the left side plate 54 of the left casing member 151 and the rear side end portion of the right rear plate 56, an air inlet 53a for air sucked into the casing 50 by the outdoor fan 35 is formed. The

(2-9-6) Top Plate The top plate 57 is a substantially rectangular plate-shaped member that constitutes the upper surface of the casing 50. The peripheral edge portion of the top plate 57 has a bent portion 57a bent downward. The left casing member 151 and the right rear plate 56 are fixed to the bent portion with screws or the like.

(2-9-7) Partition Plate The partition plate 58 is a plate-like member that extends substantially vertically upward from the bottom plate 52 to the top plate 57 of the casing 50. The lower part of the partition plate 58 is fixed to the bottom plate 52 with screws or the like. As shown in FIG. 3, the partition plate 58 has an arc shape in plan view. The partition plate 58 divides the inside of the casing 50 into a fan chamber S1 and a machine chamber S2.

  The blower chamber S1 is a space formed by surrounding the side surface with the left casing member 151 and the partition plate 58, and the outdoor fan 35 and the outdoor heat exchanger 25 are mainly disposed therein. The machine room S2 is a space formed by surrounding the side surfaces with the right front plate 55, the right rear plate 56, and the partition plate 58, and the compressor 23, the four-way switching valve 24, an electrical unit, and the like are arranged therein.

(2-10) Fan Grill The fan grill 60 is a substantially rectangular cover member that prevents the outdoor fan 35 from coming into contact with human fingers or foreign objects. The fan grill 60 is attached to the outside of the casing 50 so as to cover the entire outlet 51 a of the front plate 51 of the left casing member 151.

(3) Features (3-1)
The outdoor unit 20 of the air conditioner 1 according to the present embodiment includes a steel casing 50 and an outdoor heat exchanger 25 made of aluminum or aluminum alloy. The casing 50 includes a top plate 57. The top plate 57 is painted on all sides.

  Here, since the lower surface (inner surface) of the steel top plate 57 is painted, even if water adheres to the lower surface of the top plate 57 due to rain or condensation, the top plate 57 is hardly corroded. Elution of iron ions from can be suppressed. Therefore, it is possible to suppress the occurrence of corrosion in the outdoor heat exchanger 25 made of aluminum or aluminum alloy due to a drop of water containing iron ions falling from the top plate 57.

(3-2)
In the outdoor unit 20 of the air conditioner 1 according to the present embodiment, the casing 50 includes a bottom plate 52 as a bottom frame disposed at the bottom of the casing 50. The bottom plate 52 is a Zn—Al—Mg—Si plated steel plate.

  The Zn—Al—Mg—Si plated steel plate has excellent corrosion resistance, and the inner surface of the bottom plate 52 that is likely to come into contact with water is less likely to corrode. Thereby, the corrosion resistance of the outdoor unit 20 of the air conditioning apparatus 1 can be improved.

(4) Modifications Modifications of the present embodiment are shown below. A plurality of modified examples may be appropriately combined.

(4-1) Modification A
Although the outdoor unit 20 shown by said embodiment is used for the air conditioning apparatus 1, it is not limited to this, You may be used for another refrigeration apparatus.

(4-2) Modification B
In the outdoor unit 20 of the air conditioner 1 shown in the above embodiment, only the top plate 57 among the members constituting the casing 50 is painted on all surfaces, but the outdoor heat exchanger 25 and It is further desirable that the inner surfaces of adjacent side plates, specifically the left side plate 54, are painted.

  As a result, the inner surface of the left side plate 54 is less likely to corrode, and rainwater containing iron ions eluted from the inner surface of the left side plate 54 is prevented from adhering to the outdoor heat exchanger 25 made of aluminum or aluminum alloy. The outdoor heat exchanger 25 is less likely to be corroded.

  Further, there is a possibility that the left side plate 54 may come into contact with the outdoor heat exchanger 25 due to vibration or the like during the transfer of the outdoor unit 20, but this is a case where the left side plate 54 and the outdoor heat exchanger 25 are in contact with each other. However, since the steel plate itself and the outdoor heat exchanger 25 are not in direct contact, the outdoor heat exchanger 25 is unlikely to be damaged by corrosion.

  In particular, in the outdoor unit 20 of the air conditioner 1 shown in the above embodiment, the minimum distance between the outdoor heat exchanger 25 and the left side plate 54 is close to 10 mm or less. For this reason, rainwater or the like blown into the casing 50 adheres to the left side plate 54 and further scatters and easily adheres to the outdoor heat exchanger 25.

  However, the occurrence of corrosion on the inner surface of the left side plate 54 can be suppressed by coating the inner surface of the left side plate 54. For this reason, it becomes easy to avoid the situation where rainwater containing iron ions scatters from the left side plate 54 and corrodes the outdoor heat exchanger 25.

(4-3) Reference Example C
Furthermore, in the outdoor unit 20 of the air conditioner 1, it is more desirable that all the inner surfaces of the members constituting the casing 50 are painted.

  Thereby, the entire inner surface of the casing 50 is not easily affected by corrosion. As a result, elution of iron ions from the inner surface of the casing 50 is prevented, and the outdoor heat exchanger 25 is not easily damaged by corrosion. As a result, the entire outdoor unit 20 of the air conditioner 1 is less likely to be corroded, and the reliability of the outdoor unit 20 can be improved.

  In this case as well, the bottom plate 52 is preferably a Zn—Al—Mg—Si plated steel plate.

  Even if the coating film of the bottom plate 52 is damaged or deteriorated for some reason, a bottom frame that is highly likely to come into contact with water by using a highly corrosion-resistant Zn—Al—Mg—Si plated steel plate for the bottom frame. The inner surface of is hard to corrode. Thereby, the corrosion resistance of the outdoor unit of the refrigeration apparatus can be improved.

(4-4) Modification D
In the outdoor unit 20 of the air conditioner 1 shown in the above embodiment, a hot dip galvanized steel sheet is used for the casing 50 except for the bottom plate 52, but the present invention is not limited to this. For example, all the casings 50 may be manufactured with a Zn-Al-Mg-Si plated steel plate.

  As a result, the corrosion resistance of the casing 50 is further increased, and the corrosion of the outdoor heat exchanger 25 is further easily suppressed.

1 Air conditioning equipment (refrigeration equipment)
20 Outdoor unit 25 Outdoor heat exchanger (heat exchanger)
50 Casing 52 Bottom plate (bottom frame)
54 Left side plate (adjacent side plate)
57 Top plate

JP2010-112645A

Claims (3)

A steel casing (50) including a top plate (57);
A heat exchanger (25) made of aluminum or aluminum alloy;
With
The casing further includes an adjacent side plate (54) disposed adjacent to the heat exchanger, and side plates (51, 55, 56) other than the adjacent side plate,
The top plate is painted on the bottom and top surfaces,
The adjacent side plates are painted on the inner and outer surfaces,
The side plate of the other adjacent side plate inner surface at unpainted, only the outer surface is coated,
The outdoor unit (20) of the refrigeration apparatus (1). The distance between the heat exchanger and the adjacent side plate is 10 mm or less,
The outdoor unit according to claim 1. The casing further includes a bottom frame (52) disposed at the bottom of the casing;
At least the bottom frame is a Zn—Al—Mg—Si plated steel plate,
The outdoor unit according to claim 1 or 2.

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