JP2013139920A - Refrigerator outdoor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator outdoor unit that is hardly affected by metal corrosion, in the refrigerator outdoor unit using an aluminum or aluminum alloy heat exchanger.SOLUTION: An outdoor unit 20 of an air conditioning apparatus 1 includes an aluminum or aluminum alloy heat exchanger 25, a refrigerant pipe including a copper pipe at least at its part, and a bottom frame 52 made of a Zn-Al (11%)- Mg (3%)-Si(0.2%) plated steel plate.

Description

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

  In the outdoor unit of the refrigeration apparatus, for example, as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2010-112667), for the purpose of preventing corrosion of the bottom frame, aluminum or an aluminum alloy is used for the fins and heat transfer tubes of the heat exchanger. An example in which the bottom frame is composed of a Zn—Al plated steel plate or a Zn—Al—Mg plated steel plate has been reported.

  However, it is difficult to make all the refrigerant circuit components made of aluminum or aluminum alloy, and it is necessary to use copper piping for a part of the refrigerant circuit components. And there existed a problem that corrosion of a Zn-Al plating steel plate or a Zn-Al-Mg plating steel plate will advance by the copper ion which generate | occur | produces in copper piping.

  An object of the present invention is to provide an outdoor unit of a refrigeration apparatus that is not easily affected by metal corrosion.

  The outdoor unit of the refrigeration apparatus according to the first aspect of the present invention includes an aluminum or aluminum alloy heat exchanger, a bottom frame on which the heat exchanger is placed, and a refrigerant pipe connected to the heat exchanger. The bottom frame includes at least a Zn—Al—Mg—Si plated steel plate. The refrigerant pipe includes a copper pipe at least partially.

  Here, the heat exchanger is an aluminum or aluminum alloy heat exchanger, and by including at least a Zn-Al-Mg-Si plated steel plate in the bottom frame, due to the influence of copper ions contained in the condensed water, It is possible to suppress the occurrence of corrosion on the bottom frame.

  The entire bottom frame may be formed of a Zn—Al—Mg—Si plated steel plate, or a part thereof may be formed of a Zn—Al—Mg—Si plated steel plate.

  The outdoor unit of the refrigeration apparatus according to the second aspect of the present invention is the outdoor unit of the refrigeration apparatus according to the first aspect, wherein the outdoor unit is partitioned into an air chamber and a machine room by a partition plate inside the casing. Are all arranged on the machine room side.

  Here, since there is no influence of rain water on the machine room side, elution of copper ions from the copper pipe can be suppressed to a minimum, and the occurrence of corrosion in the bottom frame can be further suppressed.

  Furthermore, when a part of the bottom frame is formed of a Zn—Al—Mg—Si plated steel plate, it is preferable that the bottom portion of the machine room is formed of a Zn—Al—Mg—Si plated steel plate. In the configuration of the present invention, since all copper piping is arranged on the machine room side, copper ions are generated only in the machine room. Since the bottom portion of the machine room is formed of a Zn—Al—Mg—Si plated steel plate, corrosion of the bottom frame can be suppressed even if condensed water containing copper ions falls on the bottom plate.

  In the outdoor unit of the refrigeration apparatus according to the first aspect of the present invention, corrosion of the bottom frame can be suppressed due to the influence of copper ions contained in the dew condensation water.

  In the outdoor unit of the refrigeration apparatus according to the second aspect of the present invention, elution of copper ions from the copper pipe can be suppressed to a minimum.

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. 1 is a plan view of an outdoor unit of a refrigeration apparatus according to an embodiment of the present invention (only an area around an outdoor heat exchanger and an outdoor fan is shown with a top plate removed). It is a schematic perspective view of the outdoor unit of the refrigeration apparatus according to one embodiment of the present invention with the top plate, left side plate, right front plate and right rear plate removed. It is a top view of the bottom frame of the outdoor unit of the freezing apparatus which concerns on one Embodiment of this invention. It is a schematic perspective view of an outdoor heat exchanger. It is the elements on larger scale when the flat tube and 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 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, which will be described later. In the casing 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 refrigerant pipes 81 to 85. Connection by refrigerant piping will be described later.

(2) Detailed Description of Outdoor Unit FIG. 2 shows an overview perspective view of the outdoor unit 20. Reference numeral 50 denotes a casing, and reference numeral 60 denotes a fan grill attached to the front surface of the casing 50. In the following explanation, expressions indicating directions such as “up”, “down”, “left”, “right”, “front”, “rear”, “front”, “back”, etc. are used. When there is no notice in particular, the front plate 51 on which the fan grill 60 is disposed is the front, and the direction when viewed from the front side is shown.

(2-1) Casings 57, 151, 55, and 56 are a top plate, a left casing member, a right front plate, and a right rear plate, respectively, constituting a part of the casing 50. Reference numeral 60 denotes a fan grill attached to the outside of the casing 50. The peripheral edge portion of the top plate 57 has a bent portion 57a bent downward.

  As shown in FIG. 3, the left casing member 151 is integrally formed of a front plate 51 and a left plate 54. The casing 50 includes a left casing member 151, a right front plate 55, a right rear plate 56, a top plate 57, and a bottom frame 52 (FIG. 4) described later. For the left casing member 151, the right front plate 55, the right rear plate 56, and the top plate 57, hot dip galvanized steel plates are used.

  An air outlet 51 a for air blown from the outdoor fan 35 is formed in the front plate 51 of the casing 50 arranged on the blowout side of 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 outside the casing 50 of the air outlet 51a so as to cover the entire air outlet 51a.

(2-1-1) Bottom Frame As shown in FIG. 4, the bottom frame 52 constitutes the lower surface of the casing 50. As shown in FIG. 5, the bottom frame 52 is a substantially rectangular plate-shaped member. A heat exchanger 25 to be described later is placed on the bottom frame 52. A bent portion (not shown) extending upward is provided at the peripheral edge of the bottom frame 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.

  A Zn—Al—Mg—Si plated steel sheet is used for the bottom frame 52. Specifically, a Zn-11% Al-3% Mg-0.2% Si plated steel plate is used for the bottom frame 52. For this reason, even if a part of a refrigerant pipe described later is constituted by a copper pipe and the bottom frame is exposed to water containing copper ions, corrosion of the bottom frame is suppressed.

(2-1-2) 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 frame 52 to the top plate 57. The left casing member 151, the bottom frame 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 left side plate 54 is formed with a suction port 54 a for air sucked into the casing 50 by the outdoor fan 35.

(2-1-3) 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 frame 52 to the top plate 57, and is fixed to the bottom frame 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.

(2-1-4) Right rear plate The right rear plate 56 is a plate-like member that constitutes the rear portion of the right rear surface and the right side surface of the casing 50. The right rear plate 56 extends substantially vertically upward from the bottom frame 52 to the top plate 57, and is fixed to the bottom frame 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

(2-1-5) 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.

(2-2) Partition Plate The partition plate 58 is a plate-like member that extends substantially vertically upward from the bottom frame 52 of the casing 50 to the top plate 57. The lower part of the partition plate 58 is fixed to the bottom frame 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 an air chamber S1 and a machine chamber S2. For the partition plate 58, a hot dip galvanized steel plate is used.

  The air chamber S1 is a space formed by surrounding the side surface with the left casing member 151 and the partition plate 59, and the outdoor fan 35 and the outdoor heat exchanger 25 are mainly disposed therein. The air chamber S1 has a structure open to the outside due to the air flow, and is easily affected by rainwater or the like. Furthermore, since the heat exchanger 25 is disposed, condensation or the like is likely to occur.

  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 59, and the compressor 23, the four-way switching valve 24, the electrical component unit, and the like are arranged therein. The machine room is not exposed to rainwater.

(2-3) Connection by Refrigerant Piping 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.

  As shown in FIG. 6, the first gas refrigerant pipe 83 is directly connected to the heat exchanger 25 by a pipe 831 made of aluminum or aluminum alloy, and is connected to a pipe 832 made of copper. Similarly, the liquid refrigerant pipe 84 is directly connected to the heat exchanger 25 with a pipe 841 made of aluminum or aluminum alloy, and is connected to a pipe 842 made of copper.

(2-4) Compressor The compressor 23 sucks in the gas refrigerant and compresses the gas refrigerant. The compressor 23 is a positive displacement compressor.

(2-5) 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.

(2-6) 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.

(2-7) 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 installed with a space between the casing 50 and a resin member or the like between the casing 50 and the outdoor heat exchanger 25 so that the casing 50 does not come into direct contact with the casing 50, Arranged in the casing 50.

  The outdoor air taken in from the outside of the casing 50 by the outdoor fan 35 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 tube 93, fins 94, and header collecting tubes 91 and 92. FIG. 6 is a schematic perspective view of the outdoor heat exchanger 25. In FIG. 6, the fins 94 are omitted. Further, a part of the reference numerals of the flat tube 93 is omitted.

  As shown in FIG. 3, the outdoor heat exchanger 25 extends to the left from the vicinity of the end of the partition plate 58 along the back surface of the casing 50, and changes its direction in the vicinity of the left rear corner of the casing 50. It extends forward along the left side plate 54.

  FIG. 7 is a partially enlarged view when the flat tube 93 and the fin 94 are cut in the vertical direction. The flat 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 tubes 93 are arranged in a plurality of stages at intervals with the plane portion facing up and down. The fin 94 has a shape shown in FIG. 7 and is in contact with the flat tube 93. The fin 94 is formed with a plurality of notches 94a extending horizontally so that the fin 94 can be inserted into a plurality of flat tubes 93 arranged between the header collecting pipes 91 and 92. The shapes of the notches 94a of these fins 94 substantially coincide with the outer shape of the cross section of the flat tube 93, as shown in FIG.

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

(2-8) 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.

(2-9) Closing Valve The liquid refrigerant 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.

(2-10) Outdoor Fan The outdoor fan 35 is rotated by the 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.

(2-11) 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 an aluminum or aluminum alloy heat exchanger 25 and Zn—Al (11%) — Mg (3%) — Si (0.2%) plating. A bottom frame 52 made of steel plate and refrigerant pipes 81 to 85 connected to the heat exchanger 25 are provided. The refrigerant pipes 81 to 85 include copper pipes 832 and 842 at least partially.

  Here, since the bottom frame 52 is formed of a Zn—Al (11%) — Mg (3%) — Si (0.2%) plated steel plate, a conventional Zn—Al plated steel plate or Zn—Al—Mg plated steel plate is used. Corrosion of the bottom frame due to the influence of copper ions contained in the dew condensation water can be suppressed as compared with the bottom frame constituted by the above.

(3-2)
In the outdoor unit 20 of the air conditioner 1 according to the present embodiment, the copper pipes 832 and 842 are disposed in the machine room S2 partitioned by the partition plate 58. For this reason, elution of copper ions from the copper pipes 832 and 842 can be suppressed to a minimum, and the occurrence of corrosion on the bottom frame can be further suppressed. Thereby, the corrosion resistance of the outdoor unit 20 of the air conditioning apparatus 1 can be further 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 it, 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, the bottom frame 52 is formed of a Zn—Al (11%) — Mg (3%) — Si (0.2%) plated steel plate. Only the part on the machine room S2 side of the bottom frame 52 is formed of a Zn—Al (11%) — Mg (3%) — Si (0.2%) plated steel plate, and the part on the air chamber S1 side is plated with Zn—Al. You may comprise with a steel plate or a Zn-Al-Mg plated steel plate. In the configuration of the present invention, since all copper piping is arranged on the machine room side, copper ions are generated only in the machine room. By adopting such a configuration, even if condensed water containing copper ions falls on the bottom plate, corrosion of the bottom frame can be suppressed.

(4-3) Modification C
Furthermore, in the outdoor unit 20 of the air conditioner 1, the refrigerant pipes 81, 82, 85 arranged on the machine room side may be copper pipes.

1 Air conditioning equipment (refrigeration equipment)
20 Outdoor unit 21 Accumulator 23 Compressor 24 Four-way switching valve 25 Outdoor heat exchanger (heat exchanger)
26 expansion valve 27 liquid side closing valve 28 gas side closing valve 35 outdoor fan 40 indoor unit 41 indoor heat exchanger 42 indoor fan 50 casing 51 front plate 51a air outlet 52 bottom frame 53a air inlet 54 left side plate (adjacent) Side plate)
54a Air inlet 55 Right front plate 56 Right rear plate 57 Top plate 57a Bent portion 58 Partition plate 60 Fan grill 71 Liquid refrigerant communication pipe 72 Gas refrigerant communication pipe 81 Suction pipe 82 Discharge pipe 83 First gas refrigerant pipe 831 Made of aluminum Or aluminum alloy pipe 832 copper pipe 84 liquid refrigerant pipe 841 aluminum or aluminum alloy pipe 842 copper pipe 85 second gas refrigerant pipe 151 left casing member

JP2010-112667A

Claims (2)

A heat exchanger (25) made of aluminum or aluminum alloy;
A bottom frame (52) for mounting the heat exchanger;
Refrigerant piping (81-85) connected to the heat exchanger;
With
The bottom frame includes at least a Zn-Al-Mg-Si plated steel plate,
The refrigerant pipe includes a copper pipe (832, 842) at least partially.
Outdoor unit of refrigeration equipment. The outdoor unit further includes a casing (50), and is partitioned into an air chamber (S1) and a machine room (S2) by a partition plate (58) inside the casing, and the copper pipes are all on the machine room side. Placed in the
The outdoor unit according to claim 1.

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