JP2017058098A - Refrigeration cycle apparatus - Google Patents

Abstract

Provided is a refrigeration cycle apparatus capable of simplifying a support structure for refrigerant piping, and thus improving durability and manufacturability in addition to corrosion resistance. An air conditioner 1 includes a compressor 5, an outdoor heat exchanger 7, a throttle mechanism 8, an indoor heat exchanger 11, a compressor 5, an outdoor heat exchanger 7, a throttle mechanism 8, and an indoor unit. The refrigerant pipe 15 for connecting the heat exchanger 11 and circulating the refrigerant, and the refrigerant pipe 15 are connected to the compressor 5, the outdoor heat exchanger 7, the throttle mechanism 8, and the outdoor heat exchanger 7. A joint portion 18, the compressor 5, the outdoor heat exchanger 7, and an outdoor unit housing 9 that houses the throttle mechanism 8 are provided. A material having an ionization tendency equivalent to the material of the outdoor unit housing 9 or a material having a higher ionization tendency than the material of the outdoor unit housing 9 was used for at least a part of the joint 18 and the refrigerant pipe 15. [Selection] Figure 1

Description

  Embodiments described herein relate generally to a refrigeration cycle apparatus.

  As an example of a refrigeration cycle apparatus, cooling operation and heating operation are possible by switching a four-way valve, and an outdoor heat exchanger that operates as a condenser during cooling operation and an evaporator during heating operation, and an outdoor heat exchanger There is known an air conditioner that includes an outdoor unit housing that houses a housing. In conventional air conditioners, copper refrigerant pipes are used. However, in the air conditioner described in Patent Document 1, aluminum or an aluminum alloy is used for some or all of the refrigerant pipes in the outdoor unit housing. In addition, the corrosion resistance of the outdoor unit is improved by using a Zn—Al plated steel plate or a Zn—Al—Mg plated steel plate for the bottom plate of the outdoor unit housing.

JP 2010-112667 A

  By the way, aluminum or aluminum alloy has lower Young's modulus and tensile strength than copper. Therefore, the refrigerant pipe in which aluminum or an aluminum alloy is used as a material is inferior in function as a strength member as compared with the refrigerant pipe in which copper is used as a material.

  For this reason, when providing refrigerant piping in which aluminum or an aluminum alloy is used as the material in the outdoor unit housing, a special anti-vibration function is added to the refrigerant pipe support structure to prevent damage. Allowance is required.

  Therefore, the present invention provides a refrigeration cycle apparatus that can simplify the support structure of the refrigerant pipe, and can improve durability and manufacturability in addition to corrosion resistance.

  In order to solve the above problems, a refrigeration cycle apparatus according to an embodiment of the present invention includes a compressor, a condenser, a throttle mechanism, an evaporator, the compressor, the condenser, the throttle mechanism, and the evaporation. A refrigerant pipe through which a refrigerant is circulated by connecting a condenser, a joint part connecting each of the compressor, the condenser, the throttling mechanism, and the evaporator with the refrigerant pipe, the compressor, In the refrigeration cycle apparatus including the condenser and the outdoor unit housing that houses the throttle mechanism, at least a part of the joint portion and the refrigerant pipe has an ionization tendency equivalent to that of the material of the outdoor unit housing. A material having a higher ionization tendency than the material of the outdoor unit housing is used.

The block diagram of the air conditioner which concerns on embodiment of this invention. Schematic which shows an example of the outdoor unit of the air conditioner which concerns on embodiment of this invention.

  An embodiment of a refrigeration cycle apparatus according to the present invention will be described with reference to FIGS. 1 and 2. In addition, the same code | symbol is attached | subjected to the same or equivalent structure in several drawing. In the present embodiment, an air conditioner will be described as an example of the refrigeration cycle apparatus.

  FIG. 1 is a block diagram of an air conditioner according to an embodiment of the present invention.

  As shown in FIG. 1, the air conditioner 1 according to the present embodiment includes an outdoor unit 2 and an indoor unit 3.

  The outdoor unit 2 includes a compressor 5, a four-way valve 6, an outdoor heat exchanger 7, a throttle mechanism 8, and an outdoor unit housing 9. The indoor unit 3 includes an indoor heat exchanger 11 and an indoor unit housing 12.

  In addition, the air conditioner 1 includes a refrigerant pipe 15 that connects the compressor 5, the four-way valve 6, the outdoor heat exchanger 7, the throttle mechanism 8, and the indoor heat exchanger 11 to distribute the refrigerant.

  The outdoor heat exchanger 7 and the indoor heat exchanger 11 are, for example, fin-and-tube heat exchangers. The outdoor unit 2 includes a blower 16 for promoting heat exchange between the outdoor air and the outdoor heat exchanger 7 in the outdoor unit housing 9. Similarly, the indoor unit 3 includes a blower 17 for promoting heat exchange between the indoor air and the indoor heat exchanger 11.

  The throttle mechanism 8 is, for example, a PMV (Pulse Motor Valve, electronic expansion valve) or a capillary tube.

  The refrigerant pipe 15 sequentially connects the compressor 5, the four-way valve 6, the outdoor heat exchanger 7, the throttle mechanism 8, and the indoor heat exchanger 11. A joint 18 is appropriately provided between the refrigerant pipe 15 and each of the compressor 5, the four-way valve 6, the outdoor heat exchanger 7, the throttle mechanism 8, and the indoor heat exchanger 11.

  The refrigerant pipe 15 includes a discharge pipe 21 extending from the discharge port 5 a of the compressor 5 to the four-way valve 6, a suction pipe 22 extending from the four-way valve 6 to the suction port 5 b of the compressor 5, the four-way valve 6, and the outdoor heat exchanger 7. , A second pipe 32 for connecting the outdoor heat exchanger 7 and the throttle mechanism 8, and a third pipe for connecting the throttle mechanism 8 and the first pipe connecting portion 25 on the outdoor unit 2 side. The pipe 33, the fourth pipe 34 for connecting the first pipe connection 25 on the outdoor unit 2 side and the second pipe connection 26 on the indoor unit 3 side, the second pipe connection 26 on the indoor unit 3 side and the room A fifth pipe 35 that connects the heat exchanger 11, a sixth pipe 36 that connects the indoor heat exchanger 11 and the third pipe connecting portion 27 on the indoor unit 3 side, and a third pipe connection on the indoor unit 3 side A seventh pipe 37 for connecting the section 27 and the fourth pipe connecting part 28 on the outdoor unit 2 side, and a fourth pipe connecting part 28 and four on the outdoor unit 2 side. The eighth piping 38 for connecting the valve 6 comprises a.

  The fourth pipe 34 and the seventh pipe 37 allow the refrigerant to pass between the outdoor unit 2 and the indoor unit 3.

  Each of the first pipe connection part 25 and the fourth pipe connection part 28 is a refrigerant pipe 15 on the outdoor unit 2 side, that is, a discharge pipe 21, a suction pipe 22, a first pipe 31, a second pipe 32, a third pipe 33, It also serves as a joint corresponding to the entrance / exit of the eighth pipe 38.

  Each of the second pipe connection portion 26 and the third pipe connection portion 27 also serves as a joint corresponding to the refrigerant pipe 15 on the indoor unit 3 side, that is, the fifth pipe 35 and the sixth pipe 36.

  In addition, the air conditioner 1 includes a control unit 41 that is electrically connected to the four-way valve 6 via a signal line (not shown).

  The control unit 41 includes a microprocessor (not shown), a storage device (not shown) that stores various arithmetic programs executed by the microprocessor, parameters, and the like. The control unit 41 reads various control programs from the auxiliary storage device into the main storage device, and executes the various control programs read into the main storage device with the central processing unit.

  The control unit 41 controls the four-way valve 6 based on an operation input to a remote controller (not shown), and performs a cooling operation of the air conditioner 1 (a refrigerant flow indicated by a broken line in FIG. 1) and a heating operation ( In FIG. 1, the refrigerant flow (shown by a solid line) is switched.

  During the cooling operation, the air conditioner 1 discharges the high-temperature and high-pressure refrigerant compressed from the compressor 5 and sends the refrigerant to the outdoor heat exchanger 7 via the four-way valve 6. The outdoor heat exchanger 7 exchanges heat between the outdoor air passing between the fins and the tubes (heat transfer tubes) by the blower 16 and the refrigerant passing through the tubes, and cools the refrigerant to provide a high-pressure liquid state. Acts as a condenser. The refrigerant that has passed through the outdoor heat exchanger 7 passes through the throttle mechanism 8 and is reduced in pressure to become a low-pressure gas-liquid two-phase refrigerant and reaches the indoor heat exchanger 11. The indoor heat exchanger 11 performs heat exchange between indoor air that passes between the fins and the tubes (heat transfer tubes) by the blower 17 and refrigerant that passes through the tubes, and cools the air blown into the indoor space. Therefore, it acts as an evaporator that evaporates the refrigerant and turns it into a gaseous state. The refrigerant that has passed through the indoor heat exchanger 11 is sucked back into the compressor 5.

  On the other hand, during the heating operation, the air conditioner 1 inverts the four-way valve 6 to generate a refrigerant flow in the opposite direction to the refrigerant flow during the cooling operation in the refrigeration cycle, and the indoor heat exchanger 11 acts as a condenser. The outdoor heat exchanger 7 is caused to act as an evaporator.

  The air conditioner 1 is provided in the middle of the refrigerant pipe 15 on the discharge port 5 a side of the compressor 5, and is provided in a discharge temperature sensor (not shown) that detects the temperature of the discharged refrigerant, and in the outdoor heat exchanger 7. And an evaporation temperature sensor (not shown) for detecting the evaporation temperature. The discharge temperature sensor and the evaporation temperature sensor are also electrically connected to the control unit 41 via a signal line (not shown). In this case, the control unit 41 reads detection signals from the discharge temperature sensor and the evaporation temperature sensor, and controls the operation of the entire air conditioner 1 based on these signals.

  The air conditioner 1 may not be provided with the four-way valve 6 and may be dedicated to cooling. In this case, the discharge port 5 a of the compressor 5 is connected to the outdoor heat exchanger 7 via the refrigerant pipe 15, and the suction port 5 b of the compressor 5 is connected to the indoor heat exchanger 11 via the refrigerant pipe 15.

  FIG. 2 is a schematic diagram illustrating an example of an outdoor unit of an air conditioner according to an embodiment of the present invention.

  As shown in FIG. 2, the outdoor unit 2 of the air conditioner 1 according to this embodiment includes a compressor 5, a four-way valve 6, an outdoor heat exchanger 7, a throttle mechanism 8, and a blower 16 in an outdoor unit housing 9. I have.

  The outdoor unit housing 9 includes a bottom plate 42, a pair of left and right side plates 45 and 46, a back plate (not shown) having a suction port (not shown) for sending outside air to the outdoor heat exchanger 7, and the outdoor heat exchanger 7. A front plate (not shown) having an air outlet (not shown) for blowing out the air heat-exchanged in the above, a top plate 47, and a bottom plate 42 are provided upright on the interior of the outdoor unit housing 9 in the machine room 48 and the blower room. 49, and a leg portion 52 that elastically supports the outdoor unit housing 9 on the installation surface.

  The machine room 48 accommodates the compressor 5, the four-way valve 6, and the throttle mechanism 8. The blower chamber 49 accommodates the outdoor heat exchanger 7 and the blower 16.

  By the way, in general conventional air conditioners, steel materials and steel plates containing iron as a main component are applied as the material of the outdoor unit casing, while copper is applied as the material of the refrigerant piping. In the conventional air conditioner, condensed water containing copper ions is generated on the surface of the refrigerant pipe, and this condensed water is dropped on the bottom plate of the outdoor unit housing containing iron as a main component to corrode the bottom plate.

  Therefore, in the air conditioner 1 according to the embodiment of the present invention, the material having an ionization tendency equivalent to the material of the outdoor unit housing 9 or the outdoor unit housing 9 is provided in at least a part of the joint portion 18 and the refrigerant pipe 15. A material having a higher ionization tendency than the above material is applied.

  The air conditioner 1 also compresses the refrigerant pipe 15 provided in the outdoor unit housing 9 from the throttle mechanism 8 to the indoor heat exchanger 11 (third pipe 33) and the indoor heat exchanger 11. At least one of the pipes (eighth pipe 38, suction pipe 22) toward the suction port 5b of the machine 5 has a higher ionization tendency as the material of the outdoor unit housing 9, or the material of the outdoor unit housing 9 A material with a high ionization tendency is applied. The application range of this material is particularly effective in the case of a cooling only machine without the four-way valve 6.

  Further, the air conditioner 1 is a refrigerant pipe 15 provided in the outdoor unit housing 9, and other pipes (that is, suction pipes) excluding a pipe (discharge pipe 21) from the discharge port 5 a of the compressor 5 to the four-way valve 6. The pipe 22, the first pipe 31, the second pipe 32, the third pipe 33, and the eighth pipe 38) are at least partially made of a material having an ionization tendency equivalent to the material of the outdoor unit housing 9, or the outdoor unit housing A material having a higher ionization tendency than the material 9 is applied.

  In any case, all of the joint portion 18 and the refrigerant pipe 15 provided in the outdoor unit housing 9, that is, the discharge pipe 21, the suction pipe 22, the first pipe 31, the second pipe 32, the third pipe 33, The eighth pipe 38 is not prevented from being applied with a material having an ionization tendency equivalent to the material of the outdoor unit housing 9 or a material having a higher ionization tendency than the material of the outdoor unit housing 9.

  Here, the specific example of the material applied to at least a part of the outdoor unit housing 9 and the refrigerant pipe 15, that is, the whole or a part, includes steel containing iron or iron as a main component, magnesium or magnesium as a main component. A magnesium alloy, aluminum, or an aluminum alloy containing aluminum as a main component. The ionization tendency of each material has a relationship of magnesium ionization tendency> aluminum ionization tendency> iron ionization tendency. For the sake of simplicity, hereinafter, iron or steel containing iron as a main component is simply “iron material”, magnesium or magnesium alloy containing magnesium as a main component is simply “magnesium material”, and aluminum or aluminum is the main component. The aluminum alloy contained in is simply called “aluminum material”.

  And the air conditioner 1 can perform the cooling / heating operation in the third piping 33, the eighth piping 38, and the suction piping 22 that are likely to cause dew condensation in the case of the cooling only machine among the refrigerant piping 15 in the outdoor unit housing 9. The outdoor unit housing 9 and the ionization tendency with respect to the suction pipe 22, the first pipe 31, the second pipe 32, the third pipe 33, the eighth pipe 38, and the joints 18, in which dew condensation is conceivable. Apply materials that are equivalent or have a high ionization tendency.

  Specifically, the air conditioner 1 applies a magnesium material to the material of the refrigerant pipe 15, applies a magnesium material to the material of the outdoor unit housing 9, applies a magnesium material to the material of the refrigerant pipe 15, Combination of applying aluminum material to the material of the outdoor unit housing 9, applying magnesium material to the material of the refrigerant pipe 15, applying iron material to the material of the outdoor unit housing 9, and aluminum material to the material of the refrigerant piping 15 A combination in which an aluminum material is applied to the material of the outdoor unit housing 9, a combination in which an aluminum material is applied to the material of the refrigerant piping 15, and an iron material is applied to the material of the outdoor unit housing 9, and a material of the refrigerant piping 15 The material is applied in at least six combinations of a combination of applying an iron material to the outdoor unit housing 9 and applying an iron material to the material of the outdoor unit housing 9. The “material of the refrigerant pipe 15” here means a material applied to at least a part of the joint portion 18 and the refrigerant pipe 15.

  Further, the air conditioner 1 is ionized more than the material of the outdoor unit housing 9 or the material having the same ionization tendency as the material of the outdoor unit housing 9 among the refrigerant pipes 15 provided in the outdoor unit housing 9. All or some of the pipes to which materials having a high tendency are applied, that is, the discharge pipe 21, the suction pipe 22, the first pipe 31, the second pipe 32, the third pipe 33, and the eighth pipe 38 are used as outdoor unit housings. Also used as a strength member for the body 9. When a part of the refrigerant pipe 15 is also used as the strength member of the outdoor unit housing 9, the pipe may be an iron material or a magnesium material.

  Further, the air conditioner 1 has the compressor 5 fixed to the outdoor unit housing 9, and is connected to the suction port 2 a of the compressor 5 in the refrigerant pipe 15 provided in the outdoor unit housing 9. The pipe (suction pipe 22) and the pipe (discharge pipe 21) connected to the discharge port 5a of the compressor 5 are fixed to the outdoor unit housing 9.

  In the present embodiment, the air conditioner 1 reinforces the side plate 46 by fixing the discharge pipe 21 and the eighth pipe 38 to the side plate 46 of the outdoor unit housing 9 with fixing members 53 and 54 such as clamps, for example. Yes. The air conditioner 1 reinforces the partition plate 51 by fixing the suction pipe 22 to the partition plate 51 with a fixing member 55 such as a clamp, for example.

  The pipe that is also used as the strength member can be fixed to the outdoor unit housing 9 without using a special vibration-proofing structure against vibration propagating from the compressor 5. Further, the vibration generated by the compressor 5 is prevented by the legs 52 that support the outdoor unit housing 9 on the installation surface. For example, an elastic body such as a coil spring or an elastic body having rubber elasticity is applied to the leg portion 52.

  In the air conditioner 1 according to the present embodiment, at least a part of the joint portion 18 and the refrigerant pipe 15 has an ionization tendency equivalent to the material of the outdoor unit housing 9 or the material of the outdoor unit housing 9. By applying a material having a high ionization tendency, it is possible to prevent the outdoor unit housing 9 from being corroded by condensed water dripping from the refrigerant pipe 15. Although there is a method for improving the corrosion resistance of the outdoor unit housing 9 by applying a surface coating such as painting or surface treatment to the outdoor unit housing 9, the surface coating and the surface treatment deteriorate over time. In any case, it is unavoidable that the substrate is exposed. Even in such a case, the air conditioner 1 according to this embodiment can prevent the outdoor unit housing 9 from corroding.

  The air conditioner 1 according to the present embodiment includes a refrigerant pipe 15 provided in the outdoor unit housing 9, a pipe (third pipe 33) from the throttle mechanism 8 to the indoor heat exchanger 11, and indoor heat. A material having an ionization tendency equivalent to the material of the outdoor unit housing 9 or at least one of the piping (eighth piping 38, suction piping 22) from the exchanger 11 to the suction port 5b of the compressor 5, or the outdoor unit housing By applying a material having a higher ionization tendency than the material 9, corrosion of the outdoor unit housing 9 due to condensed water dripping in a large amount from a portion where the condensation is particularly likely to occur in the refrigerant pipe 15 can be more reliably prevented. it can.

  Furthermore, the air conditioner 1 according to the present embodiment is other than the refrigerant pipe 15 provided in the outdoor unit housing 9 except for the pipe (discharge pipe 21) from the discharge port 5 a of the compressor 5 to the four-way valve 6. A material having an ionization tendency equivalent to the material of the outdoor unit housing 9 in at least a part of the pipe (that is, the suction pipe 22, the first pipe 31, the second pipe 32, the third pipe 33, the eighth pipe 38), Alternatively, by applying a material having a higher ionization tendency than that of the material of the outdoor unit housing 9, the outdoor due to the condensed water dripped in a large amount from a portion where the condensation is particularly likely to occur in the refrigerant pipe 15, even if it can be used for both cooling and heating. Corrosion of the machine casing 9 can be prevented more reliably.

  Furthermore, the air conditioner 1 according to the present embodiment includes a material having an ionization tendency equivalent to the material of the outdoor unit housing 9 among the refrigerant pipes 15 provided in the outdoor unit housing 9, or the outdoor unit housing. All of pipes to which a material having a higher ionization tendency than the material 9 is applied, that is, the discharge pipe 21, the suction pipe 22, the first pipe 31, the second pipe 32, the third pipe 33, and the eighth pipe 38, or By partially using the strength member of the outdoor unit housing 9 as a strength member, it is possible to reinforce the outdoor unit housing 9 or to reduce the weight and cost by reducing the thickness of the plate material constituting the outdoor unit housing 9.

  In addition, the air conditioner 1 according to the present embodiment fixes the compressor 5 while the refrigerant pipe 15 provided in the outdoor unit housing 9 is connected to the suction port 2a of the compressor 5 ( By fixing the suction pipe 22) and the pipe (discharge pipe 21) connected to the discharge port 5a of the compressor 5 to the outdoor unit casing 9, the displacement between the outdoor unit casing 9 and the compressor 5 is reduced. Can be suppressed.

  Furthermore, the air conditioner 1 according to the present embodiment can be installed on the installation surface even if the outdoor unit housing 9 is vibrated integrally by the operation of the compressor 5 by the legs 52 that support the outdoor unit housing 9 on the installation surface. Can suppress the propagation of vibration to

  Therefore, according to the air conditioner 1 according to the present embodiment, it is possible to simplify the support structure of the refrigerant pipe 15 by applying the refrigerant pipe 15 that is easier to ensure the strength than the conventional copper refrigerant pipe. Thus, in addition to corrosion resistance, durability and manufacturability can be improved.

  In the present embodiment, an air conditioner composed of an indoor unit and an outdoor unit is described as an example of a refrigeration cycle apparatus. However, the present invention is not limited to this, and a water heat exchanger is installed in the outdoor unit instead of the indoor heat exchanger of the indoor unit. A water heater or chiller accommodated in the room may be used.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, 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 1 ... Air conditioner, 2 ... Outdoor unit, 3 ... Indoor unit, 5 ... Compressor, 5a ... Discharge port, 5b ... Suction port, 6 ... Four-way valve, 7 ... Outdoor heat exchanger, 8 ... Throttle mechanism, 9 ... Outdoor unit casing, 11 ... indoor heat exchanger, 12 ... indoor unit casing, 15 ... refrigerant pipe, 16 ... blower, 17 ... blower, 18 ... joint, 21 ... discharge pipe, 22 ... suction pipe, 25 ... first One pipe connection part, 26 ... second pipe connection part, 27 ... third pipe connection part, 28 ... fourth pipe connection part, 31 ... first pipe, 32 ... second pipe, 33 ... third pipe, 34 ... first Four piping, 35 ... fifth piping, 36 ... sixth piping, 37 ... seventh piping, 38 ... eighth piping, 41 ... control unit, 42 ... bottom plate, 45, 46 ... side plate, 47 ... top plate, 48 ... machine Chamber 49, blower chamber 51, partition plate 52, legs, 53, 54, 55.

Claims (6)

A compressor, a condenser, a throttling mechanism, an evaporator, the compressor, the condenser, the throttling mechanism, a refrigerant pipe for connecting the evaporator and circulating a refrigerant, the compressor, the condensation , The throttle mechanism, and a joint portion for connecting each of the evaporator and the refrigerant pipe, the compressor, the condenser or the evaporator, and an outdoor unit housing that accommodates the throttle mechanism In a refrigeration cycle apparatus comprising:
A refrigeration cycle apparatus using a material having an ionization tendency equivalent to a material of the outdoor unit housing or a material having a higher ionization tendency than a material of the outdoor unit housing for at least a part of the joint portion and the refrigerant pipe. . Of the refrigerant pipes provided in the outdoor unit casing, at least one of a pipe from the throttle mechanism to the evaporator and a pipe from the evaporator to the compressor suction port is provided in the outdoor unit casing. The refrigeration cycle apparatus according to claim 1, wherein a material having an ionization tendency equivalent to the material or a material having a higher ionization tendency than a material of the outdoor unit housing is used. A four-way valve provided in the outdoor unit casing and connected to the refrigerant pipe;
Among the refrigerant pipes provided in the outdoor unit casing, at least a part of the other pipes excluding the pipe from the discharge port of the compressor to the four-way valve has the same ionization tendency as the material of the outdoor unit casing. The refrigeration cycle apparatus according to claim 1, wherein a material having a higher ionization tendency or a material having a higher ionization tendency than a material of the outdoor unit housing is used. Of the refrigerant pipes provided in the outdoor unit casing, pipes using a material having an ionization tendency equivalent to the material of the outdoor unit casing, or a material having a higher ionization tendency than the material of the outdoor unit casing. The refrigeration cycle apparatus according to any one of claims 1 to 3, which is also used as a strength member of the outdoor unit casing. Fixing the compressor to the outdoor unit housing,
The pipe connected to the suction port of the compressor and the pipe connected to the discharge port of the compressor among the refrigerant pipes provided in the outdoor unit casing are fixed to the outdoor unit casing. Item 5. The refrigeration cycle apparatus according to any one of Items 1 to 4. The refrigeration cycle apparatus according to claim 5, further comprising legs that elastically support the outdoor unit housing on an installation surface.

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