Outdoor unit of an air conditioner

Abstract

The outdoor unit (1) of an air conditioning system comprises: a housing (2) having a box shape and made of a first metal; a heat exchanger (6) arranged in the housing (2) and attached to the housing (2) via a non-conductive material, wherein at least part of the heat exchanger (6) is made of a second metal, the second metal being different from the first metal with respect to its intrinsic potential; and a conductive material (3) made of a non-metal, wherein the conductive material (3) is arranged in the housing (2), the conductive material (3) being attached to the housing (2) and being electrically connected to the housing (2) and to the heat exchanger (6).

Description

Technical field

[0001] The present disclosure relates to an outdoor unit of an air conditioning system, wherein the outdoor unit comprises a housing and a heat exchanger. background

[0002] A conventional outdoor unit of an air conditioner consists of a box-shaped housing and a heat exchanger located within that housing. The heat exchanger and the housing are made of different metals. The types of metal are selected for the heat exchanger and the housing according to their required properties. For example, aluminum is generally used for a heat exchanger that requires high thermal conductivity, and iron is generally used for a housing that requires strength.

[0003] In a situation where moisture adheres to a contact point between a heat exchanger and a housing made of different metals, and where the heat exchanger and housing are in direct contact, bimetallic corrosion occurs on the metal with the lower intrinsic potential. Hereafter, bimetallic corrosion will simply be referred to as corrosion. One known method to prevent corrosion is to connect the heat exchanger and housing indirectly using a non-conductive material such as resin.

[0004] When such a device is used, the heat exchanger and the housing are electrically insulated by the non-conductive material. Consequently, parasitic capacitance is created between the heat exchanger and the housing. Furthermore, such a device presents the problem that a voltage change in the parasitic capacitance is caused by electromagnetic noise generated by an electronic substrate, a compressor, and the like, located within the housing, and this voltage change generates further electromagnetic noise. It should be noted that an air inlet for drawing in outside air is provided in a rear surface of the housing, and the heat exchanger is positioned facing the air inlet to facilitate heat exchange with the outside air.The electromagnetic noise is emitted to the outside through the air inlet between the heat exchanger and the housing.

[0005] To simultaneously achieve two solutions to problems, namely the prevention of corrosion and the reduction of electromagnetic noise, patent literature 1 discloses a technique in which a conductive connecting material is arranged between a heat exchanger and a housing. The connecting material comprises a first connecting section and a second connecting section. The first connecting section is made of the same type of metal as the metal used in the heat exchanger and is in direct contact with the heat exchanger. The second connecting section is made of the same type of metal as the metal used in the housing and is in direct contact with the housing. Furthermore, an insulating layer is provided between the first connecting section and the second connecting section, which electrically isolates the first connecting section from the second connecting section.

[0006] In the technique disclosed in patent literature 1, a portion of the insulating layer is removed, and the first and second connection sections, which are made of different metals, are partially brought into direct contact with each other to reduce electromagnetic noise by ensuring electrical conductivity. Simultaneously, a contact area between the first and second connection sections is covered with a covering material, such as waterproof adhesive tape, to prevent moisture ingress into the contact area and thus avoid corrosion of the metal. Citation list of patent literature

[0007] Patent literature 1: Japanese patent no. 6583489 Overview of the invention: The problem to be solved by the invention

[0008] However, in the technique disclosed in patent literature 1, the use of several metal types for the bonding material, the provision of the insulating layer, and the use of the waterproof covering material lead to a more complex structure. Therefore, the technique disclosed in patent literature 1 exhibits problems such as an increase in the number of production steps and an increase in the number of parts.

[0009] The present disclosure was made with regard to the above-mentioned design, and one objective of the present disclosure is to obtain an outdoor unit of an air conditioning system which is capable of achieving both corrosion prevention and a reduction of electromagnetic noise with a simple structure. Means to solve the problem

[0010] To solve the aforementioned problems and achieve the objective, an outdoor unit of an air conditioner according to the present disclosure comprises: a housing made of a first metal, wherein the housing has a box shape; a heat exchanger arranged in the housing and attached to the housing via a non-conductive material, wherein at least a part of the heat exchanger is made of a second metal which differs from the first metal with respect to its intrinsic potential; and a conductive material made of a non-metal, arranged in the housing. The conductive material is attached to the housing and electrically connected to the housing and is electrically connected to the heat exchanger. Effects of the invention

[0011] According to the present disclosure, the outdoor unit of an air conditioner has the effect of achieving both corrosion prevention and a reduction of electromagnetic noise with a simple structure. Brief description of the drawings Fig. Figure 1 is a perspective exploded view of an outdoor unit of an air conditioning system according to a first embodiment, which schematically shows the outdoor unit. Fig. Figure 2 is a front view of the outdoor unit of an air conditioner according to the first embodiment, showing the outdoor unit in a state in which a housing top element of a housing has been removed. Fig. Figure 3 is a perspective exploded view of a box for electronic substrates and an interface element in the first embodiment. Fig. Figure 4 is a perspective view of the box for electronic substrates and the interface element, which is shown in Fig. Figure 3 shows a state in which the box for electronic substrates and the interface element have been assembled. Fig. Figure 5 is a view of the outdoor unit of an air conditioner in the first embodiment from the right side. Fig. 6 is a cross-sectional view of the outdoor unit along the in Fig. 2 shown line VI-VI. Fig. Figure 7 is a perspective view of a heat exchanger in the first embodiment, which schematically shows the heat exchanger. Fig. Figure 8 is a front view of the heat exchanger in the first embodiment. Fig. Figure 9 is an enlarged view of a main part of the in Fig. 8 heat exchangers shown. Fig. Figure 10 is a top view of a conductive material in the first embodiment, showing a first conductive material. Fig. Figure 11 is a top view of the conductive material in the first embodiment, which shows a second conductive material. Fig. Figure 12 is a top view of the outdoor unit of an air conditioner according to the first embodiment, showing a condition in which a housing cover element of the housing has been removed and the conductive materials have been attached to the housing. Fig. Figure 13 is a schematic diagram showing a transmission path of electromagnetic noise as an electrical circuit in the outdoor unit of an air conditioner according to the first embodiment. Fig. Figure 14 is a circuit diagram showing, as an equivalent circuit, a path along which current acting as electromagnetic noise is sent in a case where no conductive material is provided in the outdoor unit of an air conditioner, according to the first embodiment. Fig. Figure 15 is a rear view of the outdoor unit of an air conditioner according to the first embodiment, showing the locations where electromagnetic noise is generated when no conductive material is provided. Fig. Figure 16 is a circuit diagram showing, as an equivalent circuit, a path through which current acting as electromagnetic noise is sent in a case where the heat exchanger and the housing in the outdoor unit of an air conditioner according to the first embodiment are brought into direct contact with each other without any intermediate insulating material. Description of the embodiments

[0012] The following is a detailed description of an outdoor unit of an air conditioning system according to one embodiment, with reference to the drawings. First embodiment.

[0013] Fig. Figure 1 is a perspective exploded view of an outdoor unit 1 of an air conditioning system according to a first embodiment, which schematically shows the outdoor unit 1. As in Fig. As shown in Figure 1, the outdoor unit 1 of an air conditioner comprises a housing 2, a plurality of conductive materials 3, a separating element 4, a fan 5, a heat exchanger 6, a plurality of insulating materials 7, a compressor 8, and a box 9 for electronic substrates. Hereinafter, the outdoor unit 1 of an air conditioner can simply be referred to as outdoor unit 1.

[0014] In the following description of the direction of each component of outdoor unit 1, an X-axis direction is defined as the depth direction of outdoor unit 1, a Y-axis direction as the height direction of outdoor unit 1, and a Z-axis direction as the width direction of outdoor unit 1. Furthermore, a positive X-axis direction is defined as the forward direction and a negative X-axis direction as the backward direction. The positive X-axis direction refers to a direction from the negative side to the positive side of the X-axis. The negative X-axis direction refers to a direction from the positive side to the negative side of the X-axis. Additionally, a positive Y-axis direction is defined as the upward direction and a negative Y-axis direction as the downward direction. The positive Y-axis direction refers to a direction from the negative side to the positive side of the Y-axis.The negative Y-axis direction refers to a direction from the positive side to the negative side of the Y-axis. Furthermore, a positive Z-axis direction is defined as a direction to the right, and a negative Z-axis direction as a direction to the left. The positive Z-axis direction refers to a direction from the negative side to the positive side of the Z-axis. The negative Z-axis direction refers to a direction from the positive side to the negative side of the Z-axis. In the present embodiment, the positive side of the X-axis direction, towards which an airflow generated by the fan 5 in the outdoor unit 1 is externally discharged, is considered the front, and the side opposite the front is considered the rear.

[0015] Fig. Figure 2 is a front view of the outdoor unit 1 of an air conditioner according to the first embodiment, showing the outdoor unit 1 in a state in which a front housing element 2e of the housing 2 has been removed. Fig. 2 is the heat exchanger 6, shaded by dots for better understanding. As in the Fig. 1 and Fig. As shown in Figure 2, the housing 2 is a box-shaped object that serves as the outer shell of the outdoor unit 1. The housing 2 is made of a first metal. The first metal is preferably a high-strength metal. The first metal is, for example, iron or an iron alloy.

[0016] As in Fig. As shown in Figure 1, the housing 2 comprises a housing base element 2a, a housing top element 2b, a first coupling element 2c, and a second coupling element 2d. The housing base element 2a forms a base of the outer shell of the outdoor unit 1. The shape of the housing base element 2a is a rectangle with four rounded corners in plan view. The housing top element 2b is positioned above and away from the housing base element 2a. The housing top element 2b forms a top surface of the outer shell of the outdoor unit 1. The shape of the housing top element 2b is the same as the shape of the housing base element 2a in plan view.

[0017] The first coupling element 2c and the second coupling element 2d couple the housing bottom element 2a to the housing top element 2b. The first coupling element 2c has an L-shape in plan view. The first coupling element 2c comprises: the housing front element 2e, which extends along the Z-axis direction; and a housing side element 2f, which extends rearward from a left edge of the housing front element 2e. The left edge is one of the edges of the housing front element 2e in the Z-axis direction.

[0018] The housing front element 2e connects a front edge of the housing bottom element 2a to a front edge of the housing top element 2b. The housing front element 2e forms a front surface of the outer shell of the outdoor unit 1. An air outlet 2j is formed in the housing front element 2e. The air outlet 2j is an opening for discharging an airflow generated by the blower 5 to the outside of a blower chamber 10 described below. The housing side element 2f connects a left edge of the housing bottom element 2a to a left edge of the housing top element 2b. The housing side element 2f forms a left side surface of the outer shell of the outdoor unit 1. In the present embodiment, the housing front element 2e and the housing side element 2f are integrally formed, but can also be formed separately.

[0019] The second coupling element 2d has an L-shape in plan view. The second coupling element 2d comprises: a housing side element 2g extending along the X-axis direction; and a housing rear element 2h extending to the left from a trailing edge of the housing side element 2g. The trailing edge is one of the edges of the housing side element 2g in the X-axis direction.

[0020] The housing side element 2g couples a right edge of the housing bottom element 2a with a right edge of the housing top element 2b. The housing side element 2g forms a right side surface of the outer shell of the outdoor unit 1. The housing rear element 2h couples a portion of a rear edge of the housing bottom element 2a with a portion of a rear edge of the housing top element 2b. The housing rear element 2h forms a portion of a rear surface of the outer shell of the outdoor unit 1. In the present embodiment, the housing side element 2g and the housing rear element 2h are integrally formed, but can be formed separately.

[0021] In a state in which the Fig. When the elements shown in Figure 1 are assembled, a left edge of the housing rear element 2h and a rear edge of the housing side element 2f are separated from each other. An air inlet 2i for admitting outside air is formed between the left edge of the housing rear element 2h and the rear edge of the housing side element 2f. The air inlet 2i is an opening through which air from outside the housing 2 can flow into a blower chamber 10, which is described below. The air inlet 2i is surrounded by the housing bottom element 2a, the housing top element 2b, the housing rear element 2h, and the housing side element 2f.

[0022] The conductive materials 3 are materials to be arranged within the housing 2. The conductive materials 3 are made of non-metal with conductivity instead of a metal. The material of the conductive materials 3 is, for example, a composite material in which a conductor, such as carbon fiber, has been embedded in insulating plastic, or a composite material in which a thin film of a conductor has been formed on the surface of insulating plastic. Carbon graphite is an example of such a composite material. The conductive materials 3 are attached to the housing 2 and electrically connected to it and to the heat exchanger 6. The housing 2 and the heat exchanger 6 are electrically connected via the conductive materials 3.In the present description, the term "electrical connection" between a metal material and each conductive material 3 refers not only to a state in which the metal material and each conductive material 3 are in direct contact and electrically connected, but also to a state in which the metal material and each conductive material 3 are electrically connected through a gap. In the present embodiment, the conductive materials 3 are in contact with the housing 2 and the heat exchanger 6.

[0023] The housing 2 and each conductive material 3 are connected at a contact section between the housing 2 and the conductive material 3 by welding, a screw, or the like. In a case where the surface of each element of the housing 2 is, for example, coated and the electrical resistance of the surface of each element is high, the electrical resistance of the surface of each element simply needs to be reduced, for example, by partially or completely covering the connection section beforehand or by removing the coating when screwing each conductive material 3 to the housing 2 using a serrated locking screw. The outdoor unit 1 can comprise a single conductive material 3 or a plurality of conductive materials 3. In the present embodiment, the outdoor unit 1 comprises two conductive materials 3.In the following, in a case where the two conductive materials 3 are different from each other, one of the conductive materials 3 is referred to as the first conductive material 3a and the other conductive material 3 as the second conductive material 3b.

[0024] As in Fig. As shown in Figure 2, the partition 4 is a metal material that divides the interior of the housing 2 into the blower chamber 10 and an electrical chamber 11. The partition 4 functions as part of the housing 2. The blower chamber 10 and the electrical chamber 11 are arranged side by side in the Z-axis direction. The partition 4 extends in the Y-axis direction from the housing bottom element 2a to the box 9 for electronic substrates. The partition 4 extends in the X-axis direction from the housing front element 2e to the housing rear element 2h, as shown in Figure 2. Fig. 1 shown.

[0025] The housing 2 and the separating element 4, which are in Fig. The components shown in Figure 1 are made of the same metal. The housing 2 and the separating element 4 are connected at a contact section between the housing 2 and the separating element 4 by welding, a screw, or the like. If, for example, the surface of each element of the housing 2 is coated and the electrical resistance of the surface of each element is high, the electrical resistance of the surface of each element simply needs to be reduced, for example, by partially or completely covering the connection section beforehand or by removing the coating when screwing the separating element 4 to the housing 2 using a serrated locking screw.

[0026] As in Fig. As shown in Figure 2, the blower 5 is a device arranged in the blower chamber 10 that generates an airflow. The blower 5 comprises: a bracket 5a extending from the housing base element 2a; a blower motor 5b attached to the bracket 5a; and a propeller fan 5c attached to a rotating shaft of the blower motor 5b, which rotates when the blower motor 5b rotates. An upper end section of the bracket 5a is attached to the housing top element 2b. A lower end section of the bracket 5a is attached to the housing base element 2a. The blower motor 5b is electrically connected via a blower drive wire 12 to an electronic substrate 9c, which is described below. The blower motor 5b rotates when it receives a drive signal from the electronic substrate 9c via the blower drive wire 12. When the blower motor 5b rotates to drive the propeller blower 5c, a vacuum is created in the blower chamber 10.As a result, air from outside the outdoor unit 1 flows through the air inlet 2i into the blower chamber 10. The air flowing into the blower chamber 10 passes through the heat exchanger 6, is converted into an airflow by the blower 5 and is expelled from the . Fig. Air is discharged to the outside from blower chamber 10 at the air outlet 2j shown in the diagram.

[0027] The heat exchanger 6 is an object arranged in the blower chamber 10 that facilitates heat exchange between a refrigerant and ambient air. The ambient air, which is directed into the blower 5, flows through the heat exchanger 6. The heat exchanger 6 is, for example, a parallel-flow heat exchanger. The heat exchanger 6 is arranged in the housing 2 and attached to the housing 2 via insulating materials 7, which are non-conductive materials. At least a portion of the heat exchanger 6 consists of a second metal whose internal potential differs from that of the first metal. The second metal is preferably a metal with high thermal conductivity. The second metal is, for example, aluminum or an aluminum alloy. The internal potential of the first metal is higher than that of the second metal.

[0028] As in Fig. As shown in Figure 1, the heat exchanger 6 has an L-shape in plan view. The heat exchanger 6 comprises: a first heat exchanger unit 6a extending along the Z-axis direction; and a second heat exchanger unit 6b extending along the X-axis direction. The second heat exchanger unit 6b extends forward from a left edge of the first heat exchanger unit 6a. The left edge is one of the edges of the first heat exchanger unit 6a in the Z-axis direction. The first heat exchanger unit 6a is located behind the fan 5. The second heat exchanger unit 6b is located on the left side of the fan 5, viewed from the front of the outdoor unit 1. The heat exchanger 6 and the fan 5 are spaced apart and are electrically insulated, or are arranged over an insulating material (not shown) to be electrically insulated.

[0029] The heat exchanger 6 is arranged at a distance from the first coupling element 2c and the second coupling element 2d and is electrically insulated from them, or is arranged via an insulating material (not shown) to be electrically insulated. As shown in Fig. As shown in Figure 2, an upper end section of the heat exchanger 6 is attached to the housing top element 2b via the insulating material 7. A lower end section of the heat exchanger 6 is attached to the housing bottom element 2a via the insulating material 7. The heat exchanger 6 is electrically insulated from the housing top element 2b and the housing bottom element 2a. The heat exchanger 6 is arranged such that it does not come into direct contact with metal objects such as the housing 2 and the fan 5, which are arranged around the heat exchanger 6.

[0030] As material for the two in Fig. In the insulating materials 7 shown in Figure 1, a material with electrical insulating properties, such as resin, is used. If the two insulating materials 7 are different from each other, the insulating material 7 provided at the lower end section of the heat exchanger 6 is referred to as the first insulating material 7a, and the insulating material 7 provided at the upper end section of the heat exchanger 6 is referred to as the second insulating material 7b. In the present embodiment, the first insulating material 7a and the second insulating material 7b, which in plan view have the same shape and size as the heat exchanger 6, are used to cover the entire lower and upper surfaces of the heat exchanger 6 in order to electrically insulate the heat exchanger 6 from the housing 2. However, this configuration is not intended to restrict the means of electrical insulation available to the two materials.For example, several blocks made of a material with electrical insulating properties can be provided at the bottom of the heat exchanger 6 such that the multiple blocks are arranged between the heat exchanger 6 and the housing bottom element 2a. In such a configuration, the heat exchanger 6 and the housing bottom element 2a are separated from each other in the Y-axis direction. Thus, the heat exchanger 6 and the housing bottom element 2a can be electrically isolated from each other.

[0031] As in Fig. As shown in Figure 2, the compressor 8 is a device arranged in the electrical chamber 11 and compresses the refrigerant flowing in the heat exchanger 6. The compressor 8 is located on the housing base element 2a in a lower compartment within the electrical chamber 11. The compressor 8 is fastened to the housing base element 2a by a screw or the like.

[0032] The electronic substrate housing 9 is an object that contains the electronic substrate 9c, such as a control board, required for the operation of the outdoor unit 1. The electronic substrate housing 9 has the shape of a hollow rectangular parallelepiped. The electronic substrate housing 9 is attached to an upper end section of the partition element 4 and is located above the fan chamber 10 and the electrical chamber 11. A downward-extending heat sink 9d is attached to a portion of the electronic substrate housing 9 that is located within the fan chamber 10. The heat sink 9d is exposed within the fan chamber 10. The heat sink 9d is cooled by an airflow generated by the fan 5.

[0033] A portion of the electronic substrate housing 9, located in the electrical chamber 11, is positioned above the compressor 8. The compressor drive wires 13 are connected to a portion of the electronic substrate 9c located in the electrical chamber 11. The compressor 8 is electrically connected to the electronic substrate 9c via the compressor drive wires 13. The compressor 8 is driven when it receives a drive signal output by the electronic substrate 9c via the compressor drive wires 13.

[0034] The electrical chamber 11 is surrounded by the housing bottom element 2a, the separating element 4, the housing side element 2g, the box 9 for electronic substrates, the housing front element 2e, and the housing rear element 2h, as shown in Fig. Figure 1 shows the electrical chamber 11 having a watertight structure capable of preventing the ingress of moisture, such as rainwater, from outside the housing 2. A shut-off valve 17 is provided on a lower part of an outer surface of the housing side element 2g. The shut-off valve 17 serves as a connection for refrigerant lines that are connected to an indoor unit (not shown).

[0035] Compressor 8 and shut-off valve 17 are connected to each other via multiple refrigerant lines 18. Compressor 8 and heat exchanger 6 are also connected to each other via multiple refrigerant lines 18. Connection sections 19 for the connection between the heat exchanger 6 and the refrigerant lines 18 are located in the electrical chamber 11, which has a watertight structure. When the connection sections 19 are arranged in the electrical chamber 11 as described above, contact between the connection sections 19 and moisture can be prevented. This prevents corrosion of the connection sections 19. It should be noted that, to further improve the watertightness of the connection sections 19, waterproof tape or the like can be wrapped around them to achieve watertightness.Although not specifically shown, valve devices such as a four-way valve and an expansion valve are connected to the refrigerant lines 18. The four-way valve reverses the refrigerant flow directions. The expansion valve expands the refrigerant to a predetermined pressure. The connection configuration of the refrigerant lines 18 is not limited to the form shown in the drawing.

[0036] An interface element 20 is installed in an upper compartment of the electrical chamber 11. The interface element 20 is attached to an inner surface of the housing side element 2g and a lower surface of the electronic substrate box 9. A terminal block 21 is installed on the interface element 20. External AC power lines 14 and internal power lines 15 are connected to the terminal block 21. The external AC power lines 14 are electrically connected to the internal power lines 15 via the terminal block 21. The internal power lines 15 are electrically connected to the electronic substrate 9c. The electronic substrate 9c is supplied with electrical power via the external AC power lines 14, the terminal block 21, and the internal power lines 15.The voltage of the electrical energy to be applied to the electronic substrate 9c is, for example, a single-phase voltage of 200 V, but is not limited to this voltage.

[0037] The interface element 20 is made of the same metal as the housing side element 2g. Therefore, the interface element 20 is connected to the housing side element 2g with low electrical resistance. The interface element 20 is connected to a signal ground of the electronic substrate 9c. The interface element 20 has a grounding connection point 20e to which a grounding wire 16 is connected. The interface element 20 is grounded via the grounding connection point 20e and the grounding wire 16. The housing 2 connected to the interface element 20 and the separating element 4 connected to the housing 2 are grounded via the grounding connection point 20e and the grounding wire 16.

[0038] Next, the configuration of outdoor unit 1 will be described in more detail. First, the configurations of box 9 for electronic substrates and interface element 20 will be described with reference to the Fig. 3 and Fig. 4 described. Fig. Figure 3 is a perspective exploded view of the box 9 for electronic substrates and the interface element 20 in the first embodiment. Fig. Figure 4 is a perspective view of box 9 for electronic substrates and interface element 20, which is in Fig. Figure 3 shows a state in which the box 9 for electronic substrates and the interface element 20 have been assembled.

[0039] As in Fig. As shown in Figure 3, the electronic substrate housing 9 comprises: a lower housing 9a, which is box-shaped and opens upwards; an upper cover 9b, which covers an upper opening of the lower housing 9a; and the heat sink 9d. The electronic substrate 9c is arranged within and attached to the lower housing 9a. The electronic substrate 9c comprises: the internal power leads 15, which are connected to the terminal block 21; and the compressor drive wires 13, which are connected to the compressor 8. Although not shown, the electronic substrate 9c also includes various power leads and the like to operate a heating element, the blower motor 5b, and other drive devices.

[0040] The heat sink 9d is attached to the electronic substrate 9c in such a way that it is in close contact with the electronic substrate 9c. The heat sink 9d serves to cool the heating element of the electronic substrate 9c. The heating element is, for example, a power semiconductor characterized by an insulated-gate bipolar transistor (IGBT). The electronic substrate 9c, to which the heat sink 9d is attached, is inserted into the lower box 9a from the upper opening of the lower box 9a. As shown in the Fig. 3 and Fig. As shown in Figure 4, the heat sink 9d is partially or completely exposed to the outside of the lower box 9a through a hole 9e formed in a bottom wall of the lower box 9a.

[0041] The in Fig. The lower box 9a and the upper cover 9b shown are, for example, made of rubber, resin, metal such as iron, or a combination thereof. If, for example, the lower box 9a and the upper cover 9b are made of metal, the electronic substrate box 9 has a structure such that the perimeter of the electronic substrate 9c is covered with metal. This makes it possible to suppress the emission of electromagnetic noise generated by the electronic substrate 9c from outside the electronic substrate box 9. It is possible that moisture, such as rainwater splashing into the blower chamber 10, could penetrate the electronic substrate box 9 and the electrical chamber 11 through the hole 9e in the bottom wall of the lower box 9a.Therefore, in practice, measures such as the development of better shapes for the hole 9e and the lower box 9a to prevent moisture from penetrating so easily, or the addition of a new structure for sealing are taken to ensure the watertightness of the interior of the box 9 for electronic substrates and the electrical chamber 11.

[0042] The interface element 20 comprises a vertical interface wall 20a, an upper connection flange section 20b, a transverse interface wall 20c, and a lower connection flange section 20d. The vertical interface wall 20a is a vertical wall extending along the Y-axis direction. The upper connection flange section 20b extends horizontally in the Z-axis direction from an upper edge of the vertical interface wall 20a. The upper connection flange section 20b is connected to the lower face of the bottom wall of the lower box 9a. The transverse interface wall 20c extends horizontally in the Z-axis direction from a lower edge of the vertical interface wall 20a. The lower connection flange section 20d extends downwards in the Y-axis direction from a leading edge of the transverse interface wall 20c.The lower connecting flange section 20d is connected to the inner surface of the housing side element 2g, which is in . Fig. Figure 2 shows the lower connecting flange section 20d of the interface element 20. It is attached to the housing side element 2g and electrically connected to it. The interface element 20 is attached to each housing side element 2g and the lower box 9a.

[0043] Next, the configuration of a right side surface of outdoor unit 1 will be described with reference to Fig. 5 described. Fig. Figure 5 is a view of the outdoor unit 1 of an air conditioner from the right side in the first embodiment.

[0044] An opening 2k is formed in the housing side element 2g. The inside and outside of the housing 2 can communicate directly with each other through the opening 2k. An interface cover 22 is detachably attached to the housing side element 2g. The interface cover 22 opens and covers the opening 2k by being removed and attached. When attached, the interface cover 22 covers the opening 2k; when removed, the interface cover 22 opens the opening 2k. The interface element 20 and the terminal block 21 installed in the electrical chamber 11 can be visually identified and accessed through the opening 2k. It is possible to connect various power lines through the opening 2k by removing the interface cover 22 from the housing side element 2g.

[0045] The interface cover 22 serves to prevent the ingress of moisture, such as rainwater, into the electrical chamber 11, while ensuring air permeability between the electrical chamber 11 and the outside of the housing 2. The interface cover 22 is made of resin, metal such as iron, or a combination thereof. In a case where the interface cover 22 is made of metal such as iron and is connected to the housing side element 2g with low electrical resistance, it is possible to suppress the emission of electromagnetic noise from the opening 2k to the outside of the housing 2 by covering the opening 2k with the interface cover 22.

[0046] Although not shown, a hole is formed in the interface cover 22 to ensure ventilation between the electrical chamber 11 and the outside of the housing 2, and to allow a power cable to be inserted into and removed from the electrical chamber 11 from the outside of the housing 2. Waterproof measures are taken for the hole to prevent moisture, such as rainwater, from entering the electrical chamber 11. Examples of waterproof measures include inserting a sponge into a gap between the power cable and the inner surface of the hole, or forming the hole with a louvered structure.

[0047] Next, the configuration of the separating element 4 will be described with reference to Fig. 6 described. Fig. Figure 6 is a cross-sectional view of outdoor unit 1 along the in Fig. 2 shown line VI-VI. In Fig. Figure 6 shows only the housing 2 hatched for better understanding.

[0048] The separating element 4 comprises a first separation 4a and a second separation 4b, which extends a trailing edge of the first separation 4a. The second separation 4b has an insertion hole 4c for inserting one end of the heat exchanger 6 into the electrical chamber 11 in the Z-axis direction. The heat exchanger 6 and the second separation 4b are made of different metals. For example, a resin material is preferably arranged between the heat exchanger 6 and the second separation 4b to prevent contact between the different metals.

[0049] Next, the configuration of heat exchanger 6 will be described with reference to the Fig. 7 to 9 described in more detail. Fig. Figure 7 is a perspective view of the heat exchanger 6 in the first embodiment, which schematically shows the heat exchanger 6. Fig. Figure 8 is a front view of the heat exchanger 6 in the first embodiment. Fig. Figure 9 is an enlarged view of a main part of the in Fig. 8 shown heat exchanger 6.

[0050] As in Fig. As shown in Figure 7, the heat exchanger 6 in the present embodiment is a parallel-flow heat exchanger. As shown in Fig. As shown in Figure 8, the heat exchanger 6 comprises two line distributors 6c and 6d, a plurality of refrigerant lines 6e and a plurality of fins 6f.

[0051] The two distribution boxes 6c and 6d are both hollow metal objects. Each of the distribution boxes 6c and 6d extends along the Y-axis direction. As shown in Fig. As shown in Figure 7, the two line distributors 6c and 6d are arranged apart along the Z-axis and offset from each other along the X-axis. Line distributor 6c is located at a leading edge of the second heat exchanger unit 6b. Line distributor 6d is located at a right edge of the first heat exchanger unit 6a. The refrigerant lines 18 are connected to line distributor 6d.

[0052] Each of the in Fig. The eight refrigerant lines 6e shown are hollow metal objects. Each refrigerant line 6e is, for example, a flat tube with a flat shape. The majority of refrigerant lines 6e are arranged at intervals along the Y-axis. Each refrigerant line 6e extends from one of the line distributors 6c to the other line distributor 6d. The direction in which each refrigerant line 6e extends is orthogonal to the Y-axis. One end of each refrigerant line 6e in its extension direction is connected to one of the line distributors 6c, and the other end of each refrigerant line 6e in its extension direction is connected to the other line distributor 6d. Each refrigerant line 6e enables communication between one of the line distributors 6c and the other line distributor 6d.

[0053] The ribs 6f are plate-like objects made of metal. Each rib 6f is arranged between adjacent refrigerant lines 6e. The shape of each rib 6f is not particularly restricted, but in the present embodiment it is corrugated and projects alternately upwards and downwards. That is to say, the ribs 6f are corrugated ribs in the present embodiment. As in Fig. As shown in Figure 9, each rib 6f is in contact with each of the adjacent refrigerant lines 6e and is connected to them by welding or the like.

[0054] The refrigerant flows into the Fig. The pipe distributors 6c and 6d shown in Figure 8 are located in the refrigerant lines 6e. One of the pipe distributors 6c and 6d serves to distribute the refrigerant to each of the multiple refrigerant lines 6e. The other pipe distributor 6c and 6d serves to combine the refrigerant flowing out of each of the multiple refrigerant lines 6e. The refrigerant lines 6e facilitate heat exchange between the refrigerant and the outside air. That is, the heat exchange takes place between the refrigerant flowing in the refrigerant lines 6e and the outside air flowing around the refrigerant lines 6e. The fins 6f serve to promote the heat exchange between the refrigerant and the outside air.

[0055] Next, the configurations of the conductive materials 3 will be described with reference to the Fig. 10 and Fig. 11 described in more detail. Fig. Figure 10 is a top view of the conductive material 3 in the first embodiment, showing the first conductive material 3a. Fig. Figure 11 is a top view of the conductive material 3 in the first embodiment, showing the second conductive material 3b. Fig. Figure 12 is a top view of the outdoor unit 1 of an air conditioner according to the first embodiment, showing a state in which the housing ceiling element 2b of the housing 2 has been removed and the conductive materials 3 have been attached to the housing 2. Fig. Figure 12 shows the heat exchanger 6 in direct contact with the separating element 4, the housing side element 2f, and the like of the housing 2. In reality, however, the heat exchanger 6 is arranged such that it does not come into direct contact with a metal object such as the housing 2. Fig. 12 is the heat exchanger 6, shaded by dots for better understanding.

[0056] As in Fig. As shown in Figure 10, the shape of the first conductive material 3a is not particularly restricted; however, in the present embodiment, it is L-shaped. The first conductive material 3a comprises a first plate part 3c and a second plate part 3d. The Fig. Figure 12 shows a first conductive material 3a that electrically connects the separating element 4 and the first heat exchanger unit 6a. The first conductive material 3a is located in the blower chamber 10. The first conductive material 3a is located at an inner corner formed by the separating element 4 and the first heat exchanger unit 6a. The first conductive material 3a is located on the left side of the separating element 4. The first conductive material 3a is located in front of the first heat exchanger unit 6a. The first conductive material 3a is attached to the separating element 4, which is part of the housing 2, and is electrically connected to the separating element 4 and electrically connected to the first heat exchanger unit 6a.

[0057] The first plate section 3c extends along the X-axis direction. The first plate section 3c is in contact with a side surface 4d of the separating element 4, which faces the blower chamber 10. The side surface 4d is a plane extending in the X-axis and Y-axis directions. The first plate section 3c is attached to the separating element 4. The second plate section 3d extends along the Z-axis direction. The second plate section 3d extends to the left from a trailing edge of the first plate section 3c. The trailing edge is one of the edges of the first plate section 3c in the Z-axis direction. The second plate section 3d is in contact with a front surface 6g of the first heat exchanger unit 6a, which faces the blower chamber 10. The front surface 6g is a plane that extends in the Z-axis direction and the Y-axis direction.

[0058] As in Fig. As shown in Figure 11, the shape of the second conductive material 3b is not particularly restricted; however, in the present embodiment, it is a crank shape. The second conductive material 3b comprises a fixed part 3e, a plate part 3f, and a coupling part 3g that couples the fixed part 3e to the plate part 3f. The Fig. The second conductive material 3b shown in Figure 12 electrically connects the housing side panel 2f and the second heat exchanger unit 6b. The second conductive material 3b is located in the blower chamber 10. It is positioned at an inner corner formed by the housing side panel 2f and the second heat exchanger unit 6b. The second conductive material 3b is located on the right side of the housing side panel 2f. It is positioned in front of the second heat exchanger unit 6b and extends to the left. The second conductive material 3b is attached to and electrically connected to the housing side panel 2f and to the second heat exchanger unit 6b.

[0059] The fixed part 3e extends along the X-axis direction. The fixed part 3e is in contact with an inner surface 2m of the housing side element 2f, which faces the blower chamber 10. The inner surface 2m is a plane extending in both the X- and Y-axis directions. The fixed part 3e is attached to the housing side element 2f. The coupling part 3g extends to the right from a trailing edge of the fixed part 3e. The trailing edge is one of the edges of the fixed part 3e in the X-axis direction. The coupling part 3g extends along the Z-axis direction. The coupling part 3g is in contact with a front surface 6h of the second heat exchanger unit 6b, which faces the blower chamber 10. The front surface 6h is a plane extending in both the Z- and Y-axis directions. The plate part 3f extends from a right edge of the coupling part 3g to the rear.The right edge is one of the edges of the coupling part 3g in the Z-axis direction. The plate part 3f extends in the X-axis direction. The plate part 3f is in contact with a side surface 6i of the second heat exchanger unit 6b, which faces the blower chamber 10. The side surface 6i is a plane that extends in the X-axis and Y-axis directions. The side surface 6i extends from a right edge of the front surface 6h rearward to the front surface 6g. The right edge is one of the edges of the front surface 6h in the Z-axis direction.

[0060] In the present embodiment, the conductive materials 3 are attached to the housing side element 2f or the separating element 4 to be electrically connected to the housing 2. However, the conductive materials 3 only need to be attached to the housing bottom element 2a, housing top element 2b, housing front element 2e, housing rear element 2h, housing side elements 2f and 2g, and / or separating element 4 to establish an electrical connection with the housing 2. The size of each conductive material 3 is preferably determined such that the electrical connection between the housing 2 and the heat exchanger 6 can be maintained without being affected by vibrations or the like while the outdoor unit 1 is in operation.

[0061] Next, the operation and effects of the outdoor unit 1 according to the first embodiment will be described.

[0062] As in Fig. As shown in Figure 2, the electronic substrate 9c enters a standby state when power is supplied to it from the external AC power lines 14 via the internal power lines 15. When the electronic substrate 9c receives an operating start command signal from the indoor unit (not shown) via a communication signal line between the indoor unit and the outdoor unit 1, the electronic substrate 9c causes the outdoor unit 1 to start operating. Specifically, the electronic substrate 9c outputs a drive signal to the blower motor 5b via the blower drive wire 12 to drive the blower motor 5b. Furthermore, the electronic substrate 9c outputs another drive signal to the compressor 8 via the compressor drive wires 13 to drive the compressor 8.At this stage, square-wave pulses generated by the switching of a power semiconductor are generally used as drive signals output by the electronic substrate 9c. Therefore, the drive signals include high-frequency components not originally required for driving the AC motors of the compressor 8 and the blower motor 5b, such as switching noise from the power semiconductor and harmonic components of the square-wave pulses. Such high-frequency components are electromagnetic noise sources and a cause of the electromagnetic noise being emitted out of the housing 2 via a transmission path described below.

[0063] Fig. Figure 13 is a schematic diagram showing the transmission path of electromagnetic noise as an electrical circuit in the outdoor unit 1 of an air conditioner according to the first embodiment. Fig. In Figure 13, the heat exchanger 6 is shaded with dots for better understanding. For example, if a three-phase motor is used as the AC motor of the compressor 8, the electromagnetic noise generated in the electronic substrate 9c is sent to the compressor housing 8 via a neutral point 8d of the three-phase motor winding and a parasitic capacitance 8b that exists between a motor winding 8a and the compressor housing 8. A portion of the electromagnetic noise sent to the compressor housing 8 is transmitted to the housing bottom element 2a and then fed back to the electronic substrate 9c. However, because there are impedance components such as a contact resistance 8c between the compressor housing 8 and the housing bottom element 2a, a portion of the electromagnetic noise sent to the compressor housing 8 is transmitted to the heat exchanger 6 via the refrigerant lines 18.

[0064] The properties of the parasitic impedance components of the heat exchanger 6 vary depending on the structure of the heat exchanger 6. Here, the heat exchanger 6 is assumed to be a parallel-flow heat exchanger comprising the fins 6f and the refrigerant lines 6e with a flat shape, as shown in Fig. Figure 8 shows an equivalent circuit in which parasitic inductances 23, which are included in the heat exchanger 6, are shown as in Fig. Figure 13 shows how they can be combined as an example. The parasitic impedance components, such as the parasitic inductances 23 included in the heat exchanger 6, are complex as a distributed constant circuit, as shown in Figure 13. Fig. Figure 13 shows that since the heat exchanger 6 and the housing 2 are electrically insulated by the first insulating material 7a and the second insulating material 7b, parasitic capacitances 22a and 22b are generated between the heat exchanger 6 and the housing 2. Specifically, parasitic capacitance 22a is generated between the heat exchanger 6 and the housing bottom element 2a, and parasitic capacitance 22b is generated between the heat exchanger 6 and the housing top element 2b. These parasitic capacitances 22a and 22b are generated along the transmission path of the electromagnetic noise.

[0065] Fig. Figure 14 is a circuit diagram showing, as an equivalent circuit, a path through which current acting as electromagnetic noise is sent in a case where no conductive material 3 is provided in the outdoor unit 1 of an air conditioner according to the first embodiment. Electromagnetic noise, which is transmitted from the electronic substrate 9c to the heat exchanger 6 and to the housing 2, as shown in Figure 14, is shown in Figure 14. Fig. As shown in Figure 13, the following is generated by the compressor 8: resonance with the parasitic inductances 23 contained in the heat exchanger 6; resonance with the parasitic capacitances 22a and 22b; and resonance with a parasitic impedance component such as a parasitic inductance 24 of each element of the casing 2. At this time, a voltage change occurs in the parasitic capacitances 22a and 22b due to the resonance.

[0066] In Fig. Figure 15 shows a rear view of the outdoor unit 1 of an air conditioner according to the first embodiment, showing locations where electromagnetic noise is generated when no conductive material 3 is present. Fig. In Figure 15, the heat exchanger 6 is shaded with dots for better understanding. Gaps G1, G2, G3, and G4 are formed between the heat exchanger 6 and the elements of the housing 2 to ensure electrical insulation. Fig. In 15, the positions of columns G1, G2, G3, and G4 are surrounded by dashed lines. Fig. Figure 15 shows that the columns G1, G2, G3, and G4 are not present in a portion of the space between the heat exchanger 6 and the housing 2, but in fact, the columns G1, G2, G3, and G4 are present, elongated and extending to surround four sides of the heat exchanger 6. The columns G1, G2, G3, and G4 correspond to the locations where electromagnetic noise is generated when the outdoor unit 1 does not include conductive material 3. Voltage variations occur between the heat exchanger 6 and the housing bottom element 2a and between the heat exchanger 6 and the housing top element 2b due to the parasitic capacitances 22a and 22b, respectively, which are shown in Figure 15. Fig. Figure 13 shows that columns G1, G2, G3, and G4 act as slot antennas and further generate electromagnetic noise corresponding to changes in the voltages applied to both ends of columns G1, G2, G3, and G4. The electromagnetic noise generated in columns G1, G2, G3, and G4 is emitted through air inlet 2i to the outside of the housing 2 if the outdoor unit 1 does not contain conductive material 3.

[0067] Fig. Figure 16 is a circuit diagram showing, as an equivalent circuit, a path through which current acting as electromagnetic noise is sent in a case where the heat exchanger 6 and the housing 2 are in direct contact with each other without insulating material 7 between them, in the outdoor unit 1 of an air conditioner according to the first embodiment. As a result of the removal of the first insulating material 7a and the second insulating material 7b, as shown in Figure 16, the current is transmitted as electromagnetic noise in the outdoor unit 1 of an air conditioner according to the first embodiment. Fig. As shown in Figure 15, the heat exchanger 6 and each element of the housing 2 are electrically connected. That is, the heat exchanger 6 and each element of the housing 2 are electrically short-circuited. Therefore, as shown in Figure 16, the parasitic capacitances 22a and 22b generated between the heat exchanger 6 and the elements of the housing 2 are short-circuited. Consequently, no voltage change occurs between the heat exchanger 6 and the housing bottom element 2a and between the heat exchanger 6 and the housing top element 2b, as shown in Figure 16. Fig. 15 shown, by the parasitic capacities 22a and 22b, as in Fig. 16 shown, and no electromagnetic noise is generated in columns G1, G2, G3 and G4.

[0068] In a case where the heat exchanger 6 and the housing 2, as in Fig. As shown in Figure 15, if the heat exchanger 6 is made of different metals and no insulating material 7 is provided between the heat exchanger 6 and the housing 2, the generation of electromagnetic noise in the gaps G1, G2, G3, and G4 can be prevented to reduce the emission of electromagnetic noise on the outside of the housing 2. However, corrosion occurs in the heat exchanger 6, which has a low intrinsic potential at a contact section between the heat exchanger 6 and the housing 2. If, however, insulating materials 7 are provided between the heat exchanger 6 and the housing 2, corrosion of the heat exchanger 6 can occur, which has a low intrinsic potential at the contact section between the heat exchanger 6 and the housing. However, electromagnetic noise is generated in the gaps G1, G2, G3, and G4, such that the amount of electromagnetic noise emitted outside the housing 2 increases.

[0069] As in Fig. As shown in Figure 12, the outdoor unit 1 of the present embodiment comprises: the housing 2, which has a box shape and is made of the first metal; the heat exchanger 6, which is made of the second metal and has a self-potential different from that of the first metal, arranged in the housing 2 and attached to the housing 2 via the insulating materials 7; and the non-metallic conductive materials 3 arranged in the housing 2. The conductive materials 3 are attached to the housing 2 and electrically connected to it and to the heat exchanger 6. In these configurations, the heat exchanger 6 and the housing 2 are electrically connected via the conductive materials 3. Therefore, the parasitic capacitances 22a and 22b, which exist between the heat exchanger 6 and the components shown in Figure 12, are reduced by the conductive materials 3. Fig. The 13 elements of the housing 2 shown are short-circuited. As a result, voltage changes that would be generated by the parasitic capacitances 22a and 22b between the heat exchanger 6 and the housing 2 are suppressed to such an extent that electromagnetic noise emanating from the elements shown in the housing 2 is effectively suppressed. Fig. The emission from columns G1, G2, G3 and G4 shown in the 15 columns is suppressed.

[0070] In the present embodiment, the heat exchanger 6 and the housing 2 are not in direct contact with each other, as in Fig. Figure 12 shows this. This makes it possible to prevent corrosion due to contact between the heat exchanger 6 and the housing 2. Since the conductive materials 3 in the present embodiment are made of a non-metal, it is also possible to prevent the occurrence of corrosion due to contact between the housing 2 and the conductive materials 3, as well as the occurrence of corrosion due to contact between the heat exchanger 6 and the conductive materials 3. That is, it is possible to both prevent corrosion and reduce electromagnetic noise with a simple structure in which the outdoor unit 1 comprises the conductive materials 3.

[0071] In the present embodiment, the conductive materials 3 are attached to the housing side element 2f and the separating element 4 and electrically connected to them, as shown in Fig. 12 shown. Meanwhile, the conductive materials 3 can be applied to all housing bottom elements 2a, the housing top elements 2b, the housing front elements 2e, the housing rear elements 2h, the housing side elements 2f and 2g, and the one in Fig. The separating element 4 shown in Figure 1 is attached. In a case where the conductive materials 3 are configured in this way, the electrical connection between the plates is increased. This allows the contact resistance and the parasitic inductances 23 of the Fig. The electromagnetic noise transmitted to the electronic substrate 9c, the compressor 8, and each element of the housing 2 can be reduced. This means that the noise connection voltage, interference power intensity, and the like can be reduced.

[0072] In the present embodiment, the intrinsic potential of the first metal is higher than that of the second metal. Therefore, corrosion from the second metal occurs in the heat exchanger 6 when the heat exchanger 6 and the housing 2 are in direct contact. In this embodiment, the heat exchanger 6 and the housing 2 are not in direct contact, as described above. Therefore, corrosion of the heat exchanger 6 can be prevented.

[0073] In the present embodiment, the strength of the housing 2 made from the first metal can be increased, since the first metal is iron or an iron alloy. Furthermore, since the second metal in the present embodiment is aluminum or an aluminum alloy, the thermal conductivity of the heat exchanger 6 made from the second metal can be improved.

[0074] Conventional heat exchangers include a serpentine heat exchanger and a parallel-flow heat exchanger made of aluminum. Both the serpentine and parallel-flow heat exchangers include a fin and a refrigerant line. In the serpentine heat exchanger, aluminum is generally used as the material for one fin and copper as the material for one refrigerant line. If iron is used as the material for casing 2, the order of magnitude between the respective standard electrode potentials of the metals is as follows: Aluminum <Eisen<Kupfer. Das heißt, die Größenordnung zwischen den jeweiligen Standardelektrodenpotentialen der Metallmaterialien ist wie folgt: Rippe < Gehäuse 2 < Kältemittelleitung.If the fin and refrigerant line of the serpentine heat exchanger are brought into direct contact with the housing 2, and moisture is present on part of the contact between the fin and the housing 2 and on part of the contact between the refrigerant line and the housing 2, corrosion may occur in the fin, which has a standard electrode potential lower than that of the housing 2, but corrosion does not occur in the refrigerant line, which has a standard electrode potential higher than that of the housing 2.

[0075] Aluminum is now used as the material for the fins and refrigerant lines in the parallel-flow heat exchanger made of aluminum. Therefore, if iron were used as the material for the casing, corrosion could occur in both the fins and the refrigerant lines. If corrosion develops in the refrigerant line and a hole forms, refrigerant will leak into the atmosphere. This leakage impairs the cooling and heating function of an air conditioner. As described above, the negative effects of corrosion on an aluminum parallel-flow heat exchanger are significant. Therefore, it is crucial to implement measures to prevent corrosion, and it is also necessary to take measures to reduce the electromagnetic noise generated by these preventative measures.Therefore, it is particularly useful to both prevent corrosion and reduce electromagnetic interference by using the non-metallic conductive materials 3, as in the present embodiment shown in . Fig. Figure 12 shows that the following can be used when a heat exchanger with a large negative corrosion effect is used, such as the parallel-flow aluminum heat exchanger. In other words, the use of the non-metallic conductive materials 3, as in the present embodiment, which achieves both corrosion protection and a reduction in electromagnetic noise, is particularly useful when using a heat exchanger where the intrinsic potential of the refrigerant line is lower than the intrinsic potential of a peripheral material such as the housing 2.

[0076] It should be noted that the installation location and shape of each conductive material 3 are not limited to the shape shown in the drawing. For example, the conductive materials 3 can be attached to the housing base element 2a, the housing top element 2b, or the like, or electrically connected to any surface of the heat exchanger 6. The shape of each conductive material 3 can be modified accordingly so that the conductive material 3 can be electrically connected to the housing 2 and the heat exchanger 6.

[0077] The entire heat exchanger 6 does not necessarily have to be made of the second metal, and at least a part of the heat exchanger 6 must be made only of the second metal. For example, the fins or the refrigerant lines of the heat exchanger 6 need only be made of the second metal.

[0078] The configurations described in the above embodiment show examples, and it is possible to combine the configurations with another known technique, and it is also possible to partially omit or modify the configurations without deviating from the scope of the present disclosure. Reference symbol list 1 outdoor unit of an air conditioner; 2 cases; 2a Housing base element; 2b Housing ceiling element; 2c first coupling element; 2d second coupling element; 2e Front housing element; 2f,2g housing side element; 2h rear housing element; 2i Air intake; 2j air outlet; 2k opening; 2m² of interior space; 3 conductive material; 3a first conductive material; 3b second conductive material; 3c first plate part; 3D second plate part; 3e fixed part; 3f plate section; 3g coupling part; 4 separating element; 4a first separation; 4b second separation; 4c Entry hole; 4d, 6i side surface; 5 blowers; 5a bracket; 5b Blower motor; 5c Propeller blower; 6 heat exchangers; 6a first heat exchanger unit; 6b second heat exchanger unit; 6c, 6d distribution box; 6e Refrigerant line; 6f rib; 6g , 6h front surface; 7 Insulation material; 7a first insulating material; 7b second insulating material; 8 Compressor; 8a Motor winding; 8b, 22a, 22b parasitic capacity; 8c contact resistance; 8d Neutral point of the three-phase motor winding; 9 boxes for electronic substrates; 9a lower box; 9b top cover; 9c electronic substrate; 9d Heat sink; 9th hole; 10 Blower chamber; 11 electrical chamber; 12 blower drive wire; 13 compressor drive wires; 14 external AC power lines; 15 internal power lines; 16 grounding wire; 17 Shut-off valve; 18 Refrigerant line; 19 Connecting section; 20 Interface element; 20a vertical interface element; 20b upper connecting flange section; 20c transverse interface element; 20d lower connecting flange section; 20e Earthing connection point; 21 Terminal block; 22 Interface cover; 23, 24 parasitic inductance. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 6583489

[0007]

Claims

[1] Outdoor unit of an air conditioning system, comprising: a housing made of a first metal, the housing having a box shape; a heat exchanger arranged in the housing and attached to the housing via a non-conductive material, wherein at least a part of the heat exchanger is made of a second metal, wherein the second metal is different from the first metal with respect to its intrinsic potential; and a conductive material made of a non-metal, wherein the conductive material is arranged in the housing, wherein the conductive material is attached to the housing and electrically connected to the housing and electrically connected to the heat exchanger. [2] An outdoor unit of an air conditioner according to claim 1, wherein the housing comprises: a case back element; a housing cover element arranged above the housing base element; a housing front member configured to couple the housing bottom member to the housing top member; a housing back element; and Housing side elements, wherein the conductive material is attached to the housing base element, the housing cover element, the housing front element, the housing rear element and / or the housing side elements. [3] The outdoor unit of an air conditioner according to claim 1 or 2, wherein a self-potential of the first metal is higher than a self-potential of the second metal. [4] An outdoor unit of an air conditioner according to any one of claims 1 to 3, wherein the first metal is iron or an iron alloy, and wherein the second metal is aluminum or an aluminum alloy. [5] An outdoor unit of an air conditioner according to any one of claims 1 to 4, wherein the heat exchanger is a parallel flow heat exchanger.

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