ELECTRICAL DEVICE

Abstract

An electronic substrate unit (9) is housed in an outdoor unit housing (3) of an air conditioning outdoor unit (1). The substrate unit supplies power to a compressor (5) and incorporates a power conversion circuit (13). The electronic substrate unit (9) comprises a substrate main body (15) and a metal plate (17). The electronic substrate unit (9) is positioned facing the outdoor unit housing (3) with a gap between them. The metal plate (17) in the electronic substrate unit (9) and the outdoor unit housing (3) are electrically connected via a connecting element (31). A first connected section (33) is formed in the electronic substrate unit (9), to which one end of the connecting element (31) is connected. A second connected section (35) is formed in the outdoor unit housing (3), to which the other end of the connecting element (31) is connected.

Description

TECHNICAL AREA

[0001] The present disclosure relates to an electrical device. STATE OF THE ART

[0002] Electrical devices include an electrical device that incorporates a power conversion circuit. One such electrical device is an outdoor unit used for air conditioning. The outdoor unit housing contains a compressor, an electronic substrate, a terminal block, a fan, and other components. The electronic substrate incorporates a power conversion circuit, such as an inverter. Power supplied to the electronic substrate via the terminal block from an external power source is converted into the desired power by the power conversion circuit and then supplied to the compressor and other components.

[0003] The power conversion circuitry, such as the inverter circuitry, implemented in the electronic substrate unit, is a source of electromagnetic noise. This generated electromagnetic noise propagates to the external power source. Propagation paths include one through a wire connected to the electronic substrate unit and another through the outdoor unit enclosure, which is grounded to a specific potential. PTL 1 proposes a technique for suppressing electromagnetic noise propagating through an outdoor unit enclosure. LIST OF CAPLETS PATENT LITERATURE

[0004] PTL 1: Japanese Disclosure Document No. 2015-117906 BRIEF DESCRIPTION OF THE INVENTIONAL PROBLEM

[0005] In PTL 1, a technique is proposed for grounding a terminal block attached to the outdoor unit housing to the outdoor unit housing via a wire connected to the terminal block. It is likely that the wire will be affected by an external electromagnetic field. For an air conditioning outdoor unit, it is necessary that it be less likely to be affected by an external electromagnetic field.

[0006] The present disclosure was prepared as part of such a development and one objective of it is to provide an electrical device incorporating a power conversion circuit which is less likely to be affected by an external electromagnetic field. SOLUTION TO THE PROBLEM

[0007] An electrical device according to the present disclosure is an electrical device comprising a power conversion circuit, wherein the electrical device includes a conductive housing, an electronic substrate unit, and a connecting body. The electronic substrate unit is housed in the conductive housing and includes the power conversion circuit and a noise filter. The connecting body has a first end and a second end and electrically connects the electronic substrate unit and the conductive housing. The electronic substrate unit comprises a substrate body and a printed circuit board. The printed circuit board is arranged on the substrate body and electrically connected to the conductive housing. A first connected section is formed in the electronic substrate unit, to which the first end of the connecting body is connected.A second connected section is formed within the conductive housing, to which the second end of the connecting body is connected. The electronic substrate unit is arranged such that it faces the conductive housing, with a spacer element inserted between the electronic substrate unit and the conductive housing. The first end of the connecting body is electrically connected to the circuit board when it is connected to the first connected section, and the second end of the connecting body is electrically connected to the conductive housing when it is connected to the second connected section. ADVANTAGEOUS EFFECTS OF THE INVENTION

[0008] In the electrical device according to the present disclosure, the printed circuit board arranged on the electronic substrate unit is electrically connected to the conductive housing via the connecting element. The connecting element is positioned between the electronic substrate unit and the conductive housing in such a way that the electronic substrate unit is located as close as possible to the conductive housing, with the spacer element inserted between the electronic substrate unit and the conductive housing. This makes it possible to reduce the length of the connecting element, which is assumed to be likely to be affected by external electromagnetic waves. Consequently, it is possible to suppress the influence of an external electromagnetic field on the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a perspective view schematically representing the structure of an air conditioning outdoor unit as an electrical device according to each embodiment. Fig. Figure 2 is a perspective partial view that conceptually represents a structure for electrically connecting a metal plate mounted on an electronic substrate unit and an outdoor unit housing in each embodiment. Fig. Figure 3 is a perspective partial exploded view showing a connecting part on one side of an electronic substrate unit in an air conditioning outdoor unit as an electrical device according to a first embodiment. Fig. Figure 4 is a perspective partial exploded view showing a connecting part on one side of the outdoor unit housing in the same embodiment. Fig. 5 is a partial side view showing a cross-section along a Fig. 2 shows cross-sectional line VV in the same embodiment. Fig. Figure 6 is a perspective partial exploded view showing a structure for electrically connecting a metal plate arranged on an electronic substrate unit and an outdoor unit housing in an air conditioning outdoor unit as an electrical device according to a second embodiment. Fig. 7 is a partial cross-sectional view along a Fig. 6 shown cross-sectional line VII-VII in the same embodiment. Fig. Figure 8 is a perspective partial exploded view showing a structure for electrically connecting a metal plate arranged on an electronic substrate unit and an outdoor unit housing in an air conditioning outdoor unit as an electrical device according to a third embodiment. Fig. 9 is a partial cross-sectional view along a Fig. 8 cross-sectional line IX-IX shown in the same embodiment. Fig. Figure 10 is a perspective partial exploded view showing a structure for electrically connecting a metal plate arranged on an electronic substrate unit and an outdoor unit housing in an air conditioning outdoor unit as an electrical device according to a fourth embodiment. Fig. 11 is a partial cross-sectional view along a Fig. 10 shown cross-sectional line XI-XI in the same embodiment. Fig. Figure 12 is a perspective view that schematically represents a structure of a modification of the air conditioning outdoor unit as the electrical device according to each embodiment. DESCRIPTION OF EXECUTION FORMS

[0009] First, an example of an outdoor air conditioning unit used for an air conditioning system is described as an electrical device according to each embodiment. As in Fig. Figure 1 shows that in an outdoor air conditioning unit 1, a compressor 5 for compressing refrigerant, an electronic substrate unit 9 and a connection block 19 for supplying power to the compressor 5 and the like, and a fan 7 and the like are housed in an outdoor unit housing 3 as a conductive housing.

[0010] The electronic substrate unit 9 incorporates a power conversion circuit 13, such as an inverter circuit, a noise filter 11, and the like. The terminal block 19 is arranged on a metal element 21. The metal element 21 is electrically connected to the outdoor unit housing 3. A plurality of wires 23, electrically connected to an external power source (not shown), are connected to the terminal block 19. The terminal block 19 and the electronic substrate unit 9 are electrically connected by a plurality of wires 27. The electronic substrate unit 9 and the compressor 5 are electrically connected by cables 29.

[0011] Power flows from the external power source through wires 23, terminal block 19, and wires 27 and is transferred to the electronic substrate unit 9. In the electronic substrate unit 9, the transferred power flows through the noise filter 11 and the power conversion circuit 13 and is converted into the desired power. The converted power flows through cables 29 and is supplied to the compressor 5 and the like. It should be noted that one of the wires 23 is electrically connected to the metal element 21 as a ground wire 25.

[0012] The arrangement between the electronic substrate unit 9 and the outdoor unit housing 3 is described in more detail. The electronic substrate unit 9 has a substrate body 15. The power conversion circuit 13 and the like are formed in the substrate body 15. The electronic substrate unit 9 is arranged such that it faces the outdoor unit housing 3. The electronic substrate unit 9 and the outdoor unit housing 3 are spaced apart.

[0013] A large number of metal plates for forming an electrical circuit are arranged on the substrate main body 15. Fig. Figure 1 represents a metal plate 17, which must be electrically connected to the outer unit housing 3 among the plurality of metal plates. Electromagnetic noise generated in the power conversion circuit 13 propagates from the metal plate 17 to the outer unit housing 3. The metal plate 17 can be formed on any of the main faces of the substrate body 15 that are opposite each other. Furthermore, if the electronic substrate unit 9 has a plurality of stacked substrate bodies 15, the metal plate 17 can be arranged between the stacked substrate bodies 15.

[0014] Fig. Figure 1 represents a state in which the metal plate 17 is arranged on a main surface of the substrate body 15 facing the outdoor unit housing 3, in order to illustrate the arrangement structure more clearly. In the air conditioning outdoor unit 1, the electronic substrate unit 9 and the outdoor unit housing 3 are arranged such that they face each other with a minimum necessary distance between them, with a spacer element inserted between them to avoid an unexpected hazard, such as an electrical short circuit from a part other than the metal plate 17, which must be electrically connected to the outdoor unit housing 3.

[0015] Next, a concept of a structure is described which includes a connecting body 31 (see Fig. 2) includes, which electrically connects the electronic substrate unit 9 and the outdoor unit housing 3. As in Fig. As shown in Figure 2, the metal plate 17 and the outdoor unit housing 3 are electrically connected via the connecting body 31. The connecting body 31 has one end and the other end. A first connected section 33 is formed in the metal plate 17 (electronic substrate unit 9), to which one end of the connecting body 31 is connected. A second connected section 35 is formed in the outdoor unit housing 3, to which the other end of the connecting body 31 is connected.

[0016] It should be noted that Fig. Figure 2, an exploded view, depicts a state in which the metal plate 17 is arranged on a main surface opposite the main surface of the substrate body 15 facing the outer unit housing 3, in order to more clearly illustrate an arrangement structure that includes the connecting body 31 and the metal plate 17. A structure including the connecting body 31 is described in detail below. First embodiment.

[0017] An example of an outdoor air conditioning unit used for an air conditioner is described as an electrical device according to a first embodiment. Here, a wire element 43 is used as a connecting body 31. A structure incorporating the wire element 43 is described in detail. As in Fig. As shown in Figure 3, a receiving connector 42 is connected to one end of the wire element 43. A plug-in connector 41, as the first connected section 33, is attached to the electronic substrate unit 9. The plug-in connector 41 is electrically connected to the metal plate 17. The receiving connector 42 is connected to the plug-in connector 41.

[0018] As in Fig. As shown in Figure 4, a crimp terminal 44 is connected to the other end of the wire element 43. A screw hole 4, forming the second connected section, is provided in the outdoor unit housing 3. A screw 45 is inserted through the crimp terminal 44. The crimp terminal 44 is secured to the outdoor unit housing 3 by screwing the screw 45 into the screw hole 4.

[0019] Fig. Figure 5 represents a state in which the metal plate 17 and the outdoor unit housing 3 are electrically connected by the wire element 43. As in Fig. As shown in Figure 5, in this case a spacer element 37 is arranged between the electronic substrate unit 9 and the outdoor unit housing 3 in order to maintain a state in which the electronic substrate unit 9 is located as close as possible to the outdoor unit housing 3.

[0020] In the air conditioning outdoor unit 1, the electrical device described above, the metal plate 17, which is arranged on the electronic substrate unit 9, is electrically connected to the outdoor unit housing 3 via the wire element 43. The wire element 43 is positioned between the electronic substrate unit 9 and the outdoor unit housing 3 in such a way that the electronic substrate unit 9 is located as close as possible to the outdoor unit housing 3. This makes it possible to adjust the length of the wire element 43, which is assumed to be most likely to be affected by an external electromagnetic field, to its shortest possible length. Consequently, it is possible to suppress the influence of the external electromagnetic field on the air conditioning outdoor unit 1.

[0021] It should be noted that Fig. 5 and the like, although a wire element 43 represents the wire element 43 that electrically connects the metal plate 17 (electronic substrate unit 9) and the outer unit housing 3, a plurality of wire elements 43 may be provided. With regard to suppressing the influence of the external electromagnetic field, it is considered desirable to provide a wire element 43. Furthermore, the wire element 43 is preferably thick and short.

[0022] Although the case of attaching the other end of the wire element 43 to the outdoor unit housing 3 by means of the crimp terminal 44 and the screw 45 has been described, the technique for attaching the other end of the wire element 43 to the outdoor unit housing 3 is not limited to this. For example, a dedicated terminal can be used instead of the crimp terminal 44 and the screw 45.

[0023] Furthermore, although the case of electrically connecting one end of the wire element 43 to the metal plate 17 by means of the receiving connector 42 and the plug-in connector 41 has been described, the technique for electrically connecting one end of the wire element 43 to the metal plate 17 is not limited to this. For example, a through-hole may be provided that penetrates the substrate main body 15, which contains the metal plate 17; a wire element that is somewhat thicker than the opening diameter of the through-hole may be used instead of the wire element 43; and one end of the wire element may be inserted into the through-hole.

[0024] Furthermore, for example, a plate-like conductive element can be used as the connecting body 31 instead of the wire element 43. In this case, the first connected section 33, corresponding to the plate-like conductive element, is formed in the electronic substrate unit 9, and the second connected section 35, corresponding to the plate-like conductive element, is formed in the outer unit housing 3. Second embodiment.

[0025] An example of an air conditioning outdoor unit 1 is described as an electrical device according to a second embodiment. As in the Fig. 6 and Fig. As shown in Figure 7, a screw 51 (externally threaded screw) is used as the connecting body 31, which electrically connects the metal plate 17 and the outdoor unit housing 3. It should be noted that Fig. Figure 6 shows an exploded view to illustrate a structure more clearly.

[0026] In the main substrate body 15, which contains the metal plate 17, an opening 10 is formed as the first connected section 33, through which the screw 51 is inserted. A screw hole 4 is formed in the outer unit housing 3, into which the screw 51 is screwed. The size of the screw hole 4 is, for example, up to approximately M8. A planar insulating material 38 is inserted between the electronic substrate unit 9 and the outer unit housing 3. It should be noted that, since other components are the same as those in the Fig. 1 and Fig. The two air conditioning outdoor units 1 shown are identical elements marked with the same reference symbols and their description is not repeated unless necessary.

[0027] As in Fig. As shown in Figure 6, the metal plate 17 is electrically connected to the outdoor unit housing 3 by inserting the screw 51 through the opening 10 formed in the electronic substrate unit 9 and a through-hole formed in the insulating material 38, and screwing the screw 51 into the screw hole 4 formed in the outdoor unit housing 3. Furthermore, the electronic substrate unit 9 is securely fastened to the outdoor unit housing 3 by the screw 51.

[0028] As in Fig. As shown in Figure 7, a distance corresponding to the thickness of the planar insulating material 38 is maintained between the electronic substrate unit 9 and the outdoor unit housing 3. The thickness of the insulating material 38 is set to prevent an unexpected hazard, such as an electrical short circuit from a part other than the metal plate 17, between the electronic substrate unit 9 and the outdoor unit housing 3.

[0029] In the air conditioning outdoor unit 1, the electrical device described above, the metal plate 17, which is arranged on the electronic substrate unit 9, is electrically connected to the outdoor unit housing 3 via the screw 51. It is only necessary to adjust the length of the screw 51 to a length that allows the screw 51 to be screwed into the screw hole 4 in the outdoor unit housing 3 of the electronic substrate unit 9 (opening 10).

[0030] The sheet insulating material 38 is inserted between the electronic substrate unit 9 and the outdoor unit housing 3. The gap, corresponding to the thickness of the insulating material 38, is maintained between the electronic substrate unit 9 and the outdoor unit housing 3. This makes it possible to significantly reduce the length of the screw 51, which is the connecting element 31 and is assumed to be likely to be affected by an external electromagnetic field. Consequently, it is possible to suppress the influence of the external electromagnetic field on the air conditioning outdoor unit 1.

[0031] Furthermore, the electronic substrate unit 9 is attached to the outer unit housing 3 by the screw 51, which has a head section larger than the size of the screw hole 4. This makes it possible to attach the electronic substrate unit 9 to the outer unit housing 3 without using an additional element. It should be noted that, although the case in which the opening shape of the opening 10 is a circle has been described as an example, the opening shape could, for example, be an ellipse, a rectangle, or the like. Third embodiment.

[0032] An example of an air conditioning outdoor unit 1 is described as an electrical device according to a third embodiment. As in the Fig. 8 and Fig. As shown in Figure 9, a screw 61 and an annular conductor section 63 are used as the connecting body 31, which electrically connects the metal plate 17 and the outer unit housing 3. The opening diameter of the annular conductor section 63 is larger than the diameter of the screw 61. It should be noted that Fig. Figure 8 shows an exploded view to illustrate a structure more clearly.

[0033] In the main substrate body 15, which includes the metal plate 17, the opening 10 is formed as the first connected section 33 through which the screw 61 is inserted. The screw hole 4 is formed in the outer unit housing 3, into which the screw 61 is screwed. The planar insulating material 38 is inserted between the electronic substrate unit 9 and the outer unit housing 3. It should be noted that, since other components are the same as those in the Fig. 1 and Fig. The two air conditioning outdoor units 1 shown are identical elements marked with the same reference symbols and their description is not repeated unless necessary.

[0034] As in Fig. As shown in Figure 8, the metal plate 17 is electrically connected to the outdoor unit housing 3 by inserting the screw 61 through the opening 10 formed in the electronic substrate unit 9 and the through hole formed in the insulating material 38, with the annular conductor section 63 being inserted between a head section of the screw 61 and the metal plate 17, and screwing the screw 61 into the screw hole 4 formed in the outdoor unit housing 3.

[0035] In the air conditioning outdoor unit 1, the electrical device described above, the metal plate 17, which is arranged on the electronic substrate unit 9, is electrically connected to the outdoor unit housing 3 via the screw 61. As in Fig. As shown in Figure 9, a distance corresponding to the thickness of the planar insulating material 38 is maintained between the electronic substrate unit 9 and the outdoor unit housing 3. This makes it possible, as described above, to significantly reduce the length of the screw 61, the connecting element 31, which is assumed to be likely to be affected by an external electromagnetic field. Consequently, it is possible to suppress the influence of the external electromagnetic field on the air conditioning outdoor unit 1.

[0036] Furthermore, in the air conditioning outdoor unit 1, the annular conductor section 63 is inserted between the head section of the screw 61 and the metal plate 17. This significantly increases the conductive area between the screw 61 and the metal plate 17. Consequently, it is possible to effectively ground the metal plate 17 to the outdoor unit housing 3 (a ground potential) via the screw 61 and the like. Fourth embodiment.

[0037] An example of an air conditioning outdoor unit 1 is described as an electrical device according to a fourth embodiment. As in the Fig. 10 and Fig. Figure 11 shows a spacer ladder assembly 71, comprising a screw 72 formed at one end and a screw 73 formed at the other end, and a nut 75 screwed onto the screw 72, which serves as the connecting body 31 that electrically connects the metal plate 17 and the outer unit housing 3. A collar section 74 is formed as a spacer element in the spacer ladder assembly 71. The diameter of the collar section 74 is larger than the diameter of each of the screws 72 and 73. It should be noted that Fig. Figure 10 shows an exploded view to illustrate a structure more clearly.

[0038] In the substrate main body 15, which includes the metal plate 17, the opening 10 is formed as the first connected section 33 through which the screw 72 is inserted. In the outer unit housing 3, a screw hole 4 is formed into which the screw 73 is screwed. The collar section 74 is inserted between the electronic substrate unit 9 and the outer unit housing 3. It should be noted that, since other components are the same as those in the Fig. 1 and Fig. The two air conditioning outdoor units 1 shown are identical elements marked with the same reference symbols and their description is not repeated unless necessary.

[0039] As in Fig. As shown in Figure 10, the metal plate 17 is electrically connected to the outdoor unit housing 3 via the spacer ladder assembly 71. In this case, the screw 73 of the spacer ladder assembly 71 is screwed into the screw hole 4 to bring the collar section 74 into contact with the outdoor unit housing 3. In this state, the screw 72 of the spacer ladder assembly 71 is inserted through the opening 10 in the electronic substrate unit 9. The nut 75 is screwed onto the screw 72. This electrically connects the metal plate 17 to the outdoor unit housing 3.

[0040] In the air conditioning outdoor unit 1, the electrical device described above, the metal plate 17, which is arranged on the electronic substrate unit 9, is electrically connected to the outdoor unit housing 3 via the spacer conductor arrangement 71. As in Fig. As shown in Figure 11, a distance corresponding to the thickness of the collar section 74 is maintained between the electronic substrate unit 9 and the outdoor unit housing 3. The thickness of the collar section 74 is set to prevent an unexpected hazard, such as an electrical short circuit from a part other than the metal plate 17, between the electronic substrate unit 9 and the outdoor unit housing 3.

[0041] This makes it possible, as described above, to significantly reduce the length of the spacer conductor assembly 71 as the connecting body 31, which is assumed to be likely to be affected by an external electromagnetic field. As a result, it is possible to suppress the effect of the external electromagnetic field on the air conditioning outdoor unit 1.

[0042] It should be noted that the connecting body 31, the spacer ladder assembly 71, in which the screw 73 is formed at the other end, was described as an example. As long as the spacer ladder assembly 71 has a structure that allows its other end to be attached to the outdoor unit housing 3, the spacer ladder assembly 71 does not necessarily have to have a screw 73 formed therein. (Modification)

[0043] In the air conditioning outdoor unit 1 according to each of the embodiments described above, the electronic substrate unit 9, in which the noise filter 11 and the power conversion circuit 13 are formed, has been described as an example. The electronic substrate unit 9 can be provided with a function for suppressing an overvoltage caused by lightning. As described in Fig. As shown in Figure 12, a surge protector 12 (a varistor or a surge arrester) is provided in the electronic substrate unit 9 between the noise filter 11 and the power conversion circuit 13. Since other components are the same as those in the Fig. 1 and Fig. The two air conditioning outdoor units 1 shown are identical elements marked with the same reference symbols and their description is not repeated unless necessary.

[0044] In a modified version of the air conditioning outdoor unit 1, lightning protection 12 is provided in the electronic substrate unit 9. This makes it possible to protect the electronic substrate unit 9, which is housed in the outdoor air conditioning outdoor unit 1, in the event of a lightning strike.

[0045] It should be noted that in each of the embodiments described above, the air conditioning outdoor unit 1 has been described as an example of the electrical device. The electrical device is not limited to the air conditioning outdoor unit 1, and the present disclosure is applicable to an electrical device comprising a power converter, such as an inverter circuit or a DC / DC converter circuit (direct current).

[0046] The outdoor air conditioning units described in the embodiments can be combined in various ways as required. For example, the spacer-ladder arrangement 71 described in the fourth embodiment can be used instead of the screw 61 described in the third embodiment.

[0047] The embodiments disclosed herein are for illustrative purposes only and are not limiting. This disclosure is defined by the scope of the claims and not by the description above, and is intended to include any modification that falls within the scope of the claims and has an equivalent meaning. COMMERCIAL APPLICABILITY

[0048] The present disclosure is effectively used for an electrical device that includes a power conversion circuit. REFERENCE MARK LIST

[0049] 1: Air conditioner outdoor unit; 3: Outdoor unit housing; 4: Screw hole; 5: Compressor; 7: Fan; 9: Electronic substrate unit; 10: Opening; 11: Noise filter; 12: Lightning protection; 13: Power conversion circuit; 15: Substrate main body; 17: Metal plate; 19: Terminal block; 21: Metal element; 23: Electrical wire; 25: Ground wire; 27: Electrical wire; 29: Cable; 31: Connecting body; 33: First connected section; 35: Second connected section; 37: Spacer element; 38: Insulating material; 41: Plug-in connector; 42: Receptacle connector; 43: Wire element; 44: Crimp terminal; 45, 51, 61: Screw; 62: Ring conductive element; 71: Spacer conductor assembly; 72, 73: Screw; 74: Collar section; 75: Nut.

Claims

[1] Electrical device comprising a power conversion circuit, wherein the electrical device comprises: a conductive housing; an electronic substrate unit housed in the conductive enclosure, which includes the power conversion circuitry and a noise filter; and a connecting body having a first end and a second end, which electrically connects the electronic substrate unit and the conductive housing, wherein The electronic substrate unit includes the following: a substrate body and a printed circuit board that is arranged on the substrate main body and electrically connected to the conductive housing, In the electronic substrate unit, a first connected section is formed to which the first end of the connecting body is connected, a second connected section is formed in the conductive housing, to which the second end of the connecting body is connected, the electronic substrate unit is arranged such that it faces the conductive housing, with a spacer element being inserted between the electronic substrate unit and the conductive housing, and the first end of the connecting body is electrically connected to the circuit board in a state where the first end is connected to the first connected section, and the second end of the connecting body is electrically connected to the conductive housing in a state where the second end is connected to the second connected section. [2] Electrical device according to claim 1, wherein The connecting body includes a wire element that has a receiving connector located at the first end and a crimp terminal located at the second end. the first connected section includes a plug-in connector that engages with the receiving connector, and the second connected section includes a first screw hole into which a first screw, inserted through the crimp terminal, is screwed. [3] Electrical device according to claim 1, wherein the connecting body includes a second screw the first connected section includes a substrate opening through which the second screw is inserted, and The second connected section includes a second screw hole into which the second screw is screwed. [4] Electrical device according to claim 3, wherein the circuit board is arranged on a surface opposite a surface of the substrate body facing the conductive housing and The connecting body includes a ring-shaped conductive element through which the second screw is inserted and which touches the circuit board. [5] Electrical device according to claim 3 or 4, wherein a planar insulating material is inserted as the spacer element between the substrate main body and the conductive housing. [6] Electrical device according to claim 1, wherein the connecting body comprises: a ladder arrangement comprising a fourth screw formed at the first end and a fifth screw formed at the second end, a collar section as the spacer element that is arranged between the first end and the second end in the ladder arrangement, and a nut that is screwed onto the fourth bolt, the first connected section includes a substrate opening through which the fourth screw is inserted, and The second connected section includes a third screw hole into which the fifth screw is screwed. [7] Electrical device according to any one of claims 1 to 6, comprising: a terminal block housed within the conductive enclosure, which connects wires for supplying power from an external power source to the electronic substrate unit; and a conductive element that is electrically connected to the conductive housing and that has the terminal block arranged thereon, wherein the wires include a grounding wire and the grounding wire is electrically connected to the conductive element. [8] Electrical device according to any one of claims 1 to 7, wherein lightning protection is provided in the electronic substrate unit between the noise filter and the power conversion circuit. [9] Electrical device according to any one of claims 1 to 8, comprising: a compressor housed in the conductive casing and electrically connected to the power conversion circuit; and a fan that is housed in the conductive casing.

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