Terminal box and motor

Abstract

To provide a terminal box capable of ensuring conduction between a lid, a terminal box body, and a case even when packings provided between the lid and the terminal box body and between the terminal box body and a case deteriorate with age.SOLUTION: A terminal box includes a terminal box body, a lid, a first packing, a second packing, a headed screw for fixing the lid, and a screw-integrated support for fixing the terminal box body to a case. The screw-integrated support includes a support portion and a screw portion provided at one end of the support portion. The screw portion is provided such that one end forms a seat surface that presses a fastened member. When the terminal box body is fixed to the case, it forms an abutment portion that abuts against the case in a conductive manner and a non-abutment portion that forms a space between it and the case without abutting against the case. The second packing is positioned in the space between the case and the non-abutment portion. When the lid is fixed to the terminal box body by the headed screw, it abuts against the other end of the support portion.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a terminal box attached to a motor case and a motor having the terminal box. [Background technology]

[0002] Terminal boxes used to connect motors such as pumps to external power sources are required to be dustproof and waterproof, so gaskets are provided between the lid and the terminal box body, and between the terminal box body and the case of the motor to which the terminal box is attached, as in Patent Document 1. The terminal box is sealed with the gaskets to ensure dustproof and waterproof properties.

[0003] 13(a), when attaching a terminal box body 102 to a case 111 of a conventional terminal box 101, the terminal box body 102 is fixed to the case 111 with screws 107 in a state where a packing 105 is sandwiched between the terminal box body 102 and a terminal box seat portion 112 of a motor case 111. Furthermore, to close the terminal box body 102, the lid 103 is fixed to the terminal box body 102 with screws 106 in a state where a packing 104 is sandwiched between the terminal box body 102 and the lid 103. 13(a), the terminal box body 102, the lid 103, and the case 111 are made of metal, and therefore, as shown by the double-headed arrows G to J in Fig. 13(a), there is electrical continuity between the lid 103 and the head of the screw 106 (double-headed arrow G), between the shaft of the screw 106 and the terminal box body 102 (double-headed arrow H), between the terminal box body 102 and the head of the screw 107 (double-headed arrow I), and between the shaft of the screw 107 and the case 111 (double-headed arrow J). As a result, electrical continuity is maintained between the lid 103, the terminal box body 102, and the case 111. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-118602 Summary of the Invention [Problem to be solved by the invention]

[0005] In the case of such a conventional terminal box 101, when the packings 104 and 105 become thinner due to aging, as shown in FIG. 13( b), the lid 103 moves downward by the amount of the thinner packing 104 and approaches the terminal box body 102, creating a gap between the head of the screw 106 and the lid 103. As a result, electrical continuity between the lid 103 and the screw 106 is insufficient. Similarly, the terminal box body 102 moves downward by the amount of the thinner packing 105 and approaches the terminal box seat 112 of the case 111, creating a gap between the head of the screw 107 and the terminal box body 102. As a result, electrical continuity between the terminal box body 102 and the screw 107 is insufficient. At this time, although there is no change in the electrical continuity between the screw 106 and the terminal box body 102 (indicated by the double-headed arrow H), electrical continuity between the lid 103 and the terminal box body 102 via the screw 106 is interrupted. Furthermore, although there is no change in the electrical continuity (both arrows J) between the screw 107 and the terminal box seat 112, the electrical continuity between the terminal box body 102 and the case 111 via the screw 107 is cut off. As a result, electrical continuity cannot be ensured between the lid 103, the terminal box body 102, and the case 111.

[0006] The present invention aims to provide a terminal box that can ensure conductivity between the lid, the terminal box body, and the motor case even if the gaskets provided between the terminal box lid and the terminal box body, and between the terminal box body and the motor case, deteriorate over time. [Means for solving the problem]

[0007] A terminal box according to a first aspect of the present invention includes a terminal box body that accommodates a terminal block and is attached to a motor case; a lid that closes an opening of the terminal box body; a first gasket that is provided between the terminal box body and the lid; a second gasket that is provided between the case and the terminal box body; a head screw that secures the lid to the terminal box body; and a screw-integrated support that secures the terminal box body to the case. The screw-integrated support has a support portion and a threaded portion that is provided at one end of the support portion. The threaded portion is provided at the one end so that the one end forms a seat that presses against a fastened member. When the terminal box body is fixed to the case by the screw-integrated support, the terminal box body forms an abutment portion that electrically contacts the case and a non-abutment portion that does not contact the case and forms a space between the case and the non-abutment portion. The second gasket is disposed in the space formed between the case and the non-abutment portion. When the lid is fixed to the terminal box body by the headed screw, the lid abuts against the other end of the support post.

[0008] With a terminal box having such a configuration, even if the first gasket and the second gasket deteriorate over time and become thinner, the positional relationship between the lid, the terminal box body and the case does not change, and the electrical conductivity between the lid, the terminal box body and the case can be maintained.

[0009] In the terminal box according to the second aspect of the present invention, when the abutment portion abuts against the case, the second gasket is compressed, and when the other end of the support portion abuts against the inner surface of the lid, the first gasket is compressed.

[0010] According to the terminal box having such a configuration, the first packing and the second packing ensure sufficient sealing of the terminal box.

[0011] A motor according to a third aspect of the present invention is a motor having the terminal box of the first or second aspect, wherein the terminal box is fixed to the case of the motor by the screw-integrated support.

[0012] With a motor having such a configuration, even if the first packing and the second packing deteriorate over time, electrical continuity can be sufficiently ensured between the lid, the terminal box body, and the case.

[0013] In the motor according to a fourth aspect of the present invention, a terminal box seat portion is provided on the outer periphery of the case, and the terminal box is fixed to the terminal box seat portion. [Effects of the Invention]

[0014] According to the present invention, a terminal box can be provided that can ensure conductivity between the lid, the terminal box body, and the case even if the gaskets provided between the terminal box lid and the terminal box body, and between the terminal box body and the motor case, deteriorate over time. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a side view of a motor with a terminal box attached, with a portion cut away. [Figure 2] FIG. 2 is a front view of the terminal box of the present embodiment. [Figure 3] FIG. 2 is a front view of the terminal box in an exploded state. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 10 is a plan view of the terminal box attached to the case with the lid open. [Figure 8] FIG. [Figure 9] FIG. 4 is a plan view of the first packing. [Figure 10] FIG. 4 is a plan view of the second packing. [Figure 11] FIG. [Figure 12] 1A and 1B are schematic cross-sectional views showing the conductive state of the terminal box of this embodiment, where FIG. 1A is a schematic cross-sectional view of the state before the packing deteriorates, and FIG. 1B is a schematic cross-sectional view of the state after the packing deteriorates. [Figure 13] 1A and 1B are schematic cross-sectional views showing the electrical conduction state of a terminal box of the prior art, where FIG. 1A is a schematic cross-sectional view showing the state before the packing deteriorates, and FIG. 1B is a schematic cross-sectional view showing the state after the packing deteriorates. DETAILED DESCRIPTION OF THE INVENTION

[0016] A terminal box 1 according to an embodiment of the present invention will now be described with reference to the drawings. As shown in FIG. 1, the terminal box 1 of this embodiment is attached to a case 11 of a motor 10. The terminal box 1 is used to connect the motor 10 to an external power supply. As shown in FIGS. 2 and 3, the terminal box 1 includes a terminal box body 2, a lid 3, a first gasket 4, and a second gasket 5. The first gasket 4 is provided between the terminal box body 2 and the lid 3. The second gasket 5 is provided between the terminal box body 2 and the case 11. The lid 3 is fixed to the terminal box body 2 using a head screw 6. The terminal box body 2 is fixed to the case 11 using a screw-integrated support post 7. The screw-integrated support post 7 has a substantially cylindrical support portion 72 and a screw portion 71 provided at one end thereof.

[0017] The terminal box body 2 is made of metal. As shown in FIGS. 4, 5, and 6, the terminal box body 2 has a bottom 21 and four wall portions 22 and has a generally rectangular parallelepiped shape with an opening at the top. The opening of the terminal box body 2 is closed by a lid 3. As shown in FIG. 7, a terminal block 23 is housed inside the terminal box body 2. An opening 213 is provided in the bottom 21. When the terminal box 1 is attached to the case 11 of the motor 10, the interior of the terminal box body 2 and the interior of the case 11 communicate through the opening 213, and wiring for the motor 10 is passed through the opening 213. As shown in FIG. 7, the terminal block 23 is fixed to two bases 215 provided on the bottom 21 with screws and is arranged across the opening 213. The wall portions 22 have openings 222 through which an external power supply line is passed. The openings 222 communicate with the inside of a joint connection port 223 provided on the outer surface of the wall portions 22. An external power supply line and wiring of the motor 10 are connected to the terminal block 23 .

[0018] As shown in FIGS. 5 and 6 , abutment portions 211 and non-abutment portions 212 are formed on the outer surface of the bottom 21 of the terminal box body 2. When the terminal box body 2 is fixed to the case 11 by the screw-integrated support posts 7, the abutment portions 211 abut against the case 11 to allow electrical continuity, and the non-abutment portions 212 do not abut against the case 11, forming a space between them. In this embodiment, the abutment portions 211 are cylindrical protrusions provided at the four corners of the bottom 21. It is preferable that the abutment portions 211 are formed integrally with the terminal box body 2. The shape of the abutment portions 211 is not particularly limited, and the number of the abutment portions 211 is also not particularly limited. The abutment portions 211 only need to have a shape, size, and height that allows them to abut against the case 11 when the second packing 5 is sandwiched between the terminal box body 2 and the case 11.

[0019] A plurality of through holes 214 are provided in the bottom 21. Screw portions 71 are inserted into the through holes 214 when the terminal box body 2 is fixed to the case 11 by the screw-integrated support posts 7. In this embodiment, the through holes 214 are arranged in four locations inside the abutment portions 211. Screw holes 221 are provided at the upper ends of each corner of the four wall portions 22 of the terminal box body 2. As shown in FIG. 4 , each corner of the four wall portions 22 is thickened to provide the screw holes 221. The first gasket 4 and the lid 3 are placed on the terminal box body 2, and the head screws 6 are threadedly engaged with the screw holes 221 to fix the first gasket 4 and the lid 3 to the terminal box body 2.

[0020] The lid 3 that closes the opening of the terminal box body 2 is made of metal. As shown in FIG. 8 , the lid 3 has through holes 31 at its four corners, into which head screws 6 are inserted. When the opening of the terminal box body 2 is closed with the lid 3, as shown in FIG. 2 , a first gasket 4 is placed between the terminal box body 2 and the lid 3. The first gasket 4 is made of rubber. The first gasket 4 has a substantially rectangular shape with four sides that follow the upper end of the wall portion 22 of the terminal box body 2. As shown in FIG. 9 , each corner of the first gasket 4 bulges inward, forming through holes 41 into which the head screws 6 are inserted. With the first gasket 4 sandwiched between the terminal box body 2 and the lid 3, the head screws 6 are inserted into the through holes 31 and 41 and engaged with the screw holes 221. When the heads of the head screws 6 press against the lid 3, the first gasket 4 is compressed, sealing the gap between the terminal box body 2 and the lid 3.

[0021] When the terminal box body 2 is fixed to the case 11, the second packing 5 is disposed between the terminal box body 2 and the case 11. In this embodiment, the second packing 5 is disposed in the space between the non-contact portion 212 of the terminal box body 2 and the terminal box seat portion 12 of the case 11. The second packing 5 is made of rubber. The second packing 5 has a generally rectangular shape with four sides aligned along the upper end of the wall 121 of the terminal box seat portion 12. Each corner of the second packing 5 bulges inward and is provided with a through-hole 51. Each through-hole 51 corresponds to a corresponding screw hole 122 of the terminal box seat portion 12, and the threaded portion 71 of the screw-integrated support 7 is inserted through the through-hole 51. As shown in FIG. 10 , each corner of the second packing 5 further includes a notch 52 on the outer side. Each notch 52 corresponds to a corresponding contact portion 211 on the bottom surface of the terminal box body 2. When fixing the terminal box body 2 to the case 11, the terminal box body 2 is placed on the case 11 with the abutting portion 211 aligned with the notch 52 of the second packing 5 placed on the case 11.

[0022] When the terminal box body 2 is placed in the case 11, the abutting portion 211 forms a space between the non-abutting portion 212 on the bottom surface of the terminal box body 2 and the upper end of the wall 121 of the terminal box seat portion 12 of the case 11. The second packing 5 is placed in this space. Therefore, the thickness of the second packing 5 is determined depending on the distance between the non-abutting portion 212 on the bottom surface 21 of the terminal box body 2 and the upper end of the wall 121 of the terminal box seat portion 12 of the case 11. When the terminal box body 2 is fixed to the case 11, the second packing 5 placed between the non-abutting portion 212 of the terminal box body 2 and the terminal box seat portion 12 is compressed, and the abutting portion 211 and the terminal box seat portion 12 must abut against each other. Therefore, it is preferable that the second packing 5 have a thickness greater than the distance between the non-abutting portion 212 of the terminal box body 2 and the terminal box seat portion 12 of the case 11. By using the second packing 5 having such a thickness, the gap between the terminal box body 2 and the case 11 is sealed.

[0023] As described with reference to FIG. 3 , the screw-integrated support 7 has a threaded portion 71 and a support portion 72 that are integrally formed with each other. The threaded portion 71 and the support portion 72 are made of metal. The threaded portion 71 is provided at one end of the support portion 72. The threaded portion 71 is formed with a diameter smaller than that of the support portion 72 so that one end of the support portion 72 forms a seat that presses against the bottom portion 21 of the terminal box body 2, which is the fastened member. The other end of the support portion 72 is a flat surface that abuts against the inner surface of the lid 3, and this flat surface has a cross-shaped groove that corresponds to the shape of the tip of a Phillips screwdriver. When the terminal box body 2 is fixed to the case 11, the threaded portion 71 is disposed within the terminal box body 2 and is threadedly engaged with the case 11. The support portion 72 abuts against the inner surface of the lid 3 and is used to support the lid 3. The screw portion 71 is inserted into the through-hole 214 in the bottom 21 of the terminal box body 2 and the through-hole 51 in the second packing 5, and is threadedly engaged with the screw hole 122 in the terminal box seat 12. At this time, the seat surface at one end of the support portion 72 presses against the bottom 21 of the terminal box body 2 from above, thereby fixing the terminal box body 2 to the case 11. The support portion 72 has a height that allows the other end of the support portion 72 to abut against the lid 3 when the lid 3 is fixed to the terminal box body 2.

[0024] Next, an embodiment of a motor 10 having a terminal box 1 will be described with reference to the drawings. As shown in FIG. 1 , the motor 10 has a case 11 to which the terminal box 1 is attached. The case 11 houses a stator 15, a rotor 16, and a rotating shaft 17. The motor 10 also has an external fan 18 attached to the tip of the rotating shaft 17 and an external fan cover 19 attached to the end of the case 11 and covering the external fan 18. The outer peripheral surface of the case 11 is provided with a terminal box seat 12 for attaching the terminal box 1. The motor 10 also includes wiring and other components connected to a terminal block 23 of the terminal box 1. The motor 10 of this embodiment is a motor used in a pump or the like. However, the application, configuration, and the like are not particularly limited, and any configuration that can accommodate the terminal box 1 of this embodiment may be used. Furthermore, the terminal box seat 12 of the motor 10 can be the same as that for attaching a conventional terminal box. Therefore, the motor 10 of this embodiment can be easily achieved by using the terminal box 1 instead of a conventional terminal box.

[0025] The terminal box seat 12 is integrally formed on the outer circumferential surface of the case 11 of the motor 10 to mount the terminal box 1 to the case 11. The terminal box seat 12 is made of metal. The terminal box seat 12 has four walls 121 integrally formed on the outer circumferential surface of the case 11 to mount the terminal box main body 2. The upper ends of the four walls 121 of the terminal box seat 12 have surfaces that are located in the same plane. As shown in FIG. 11 , a plurality of screw holes 122 are provided at the upper ends of each corner of the four walls 121 of the terminal box seat 12, into which the screw portions 71 of the screw-integrated support posts 7 are threadedly engaged. To provide the screw holes 122, each corner of the terminal box seat 12 bulges inward, increasing its thickness. As shown in FIG. 11 , the two earth screw portions 14 and the opening 13 provided in the case 11 are arranged within the terminal box seat 12. When the terminal box body 2 is attached to the case 11, the earth screw portion 14 is disposed below the opening 213 of the bottom portion 21, as shown in FIG.

[0026] The motor 10 of this embodiment has a terminal box 1, so that even if the first gasket 4 and the second gasket 5 become thinner due to aging or the like, multiple conduction routes are always secured between the terminal box 1 and the case 11, thereby enabling a stable conduction state to be maintained.

[0027] A method for attaching the terminal box 1 to the case 11 of the motor 10 will be described with reference to the drawings. First, the second packing 5 is placed on the terminal box seat 12 of the case 11, and then the terminal box main body 2 is placed on the second packing 5. At this time, the second packing 5 is placed so that the through-hole 51 of the second packing 5 overlaps the screw hole 122 of the terminal box seat 12. Then, when the terminal box main body 2 is placed with the abutment portion 211 aligned with the notch 52 of the second packing 5, the through-hole 214 of the terminal box main body 2 overlaps the screw hole 122 of the terminal box seat 12 and the through-hole 51 of the second packing 5. After that, the terminal box main body 2 is fixed to the terminal box seat 12 using the screw-integrated support 7. When the threaded portion 71 of the screw-integrated support 7 is inserted into the through-holes 214 and 51 and engaged with the screw hole 122, the seat surface at one end of the support portion 72 presses against the bottom portion 21, causing the terminal box main body 2 to compress the second gasket 5 and bringing the end of the abutment portion 211 into contact with the end of the wall 121 of the terminal box seat portion 12. In this way, when the terminal box main body 2 is fixed to the case 11 using the screw-integrated support 7, the second gasket 5 seals the gap between the terminal box main body 2 and the case 11.

[0028] Next, the terminal block 23 is attached to the base 215, wiring is performed, and then the first packing 4 is placed on the wall portion 22 of the terminal box body 2, and then the lid 3 is placed on top of it, and the lid 3 and first packing 4 are fixed to the terminal box body 2 with the head screws 6. At this time, the first packing 4 and the lid 3 are positioned such that the through holes 41 of the first packing 4 are aligned with the screw holes 221 of the terminal box body 2, and the through holes 31 of the lid 3 are aligned with the through holes 41 of the first packing 4 and the screw holes 221 of the terminal box body 2. When the head screws 6 are inserted into the through holes 31 and 41 and engaged with the screw holes 221, the heads of the head screws 6 press against the lid 3, compressing the first packing 4, and the upper ends of the support portions 72 of the screw-integrated support columns 7 come into contact with the inner surface of the lid 3. In this way, when the lid 3 is fixed to the terminal box body 2 using the head screws 6, the terminal box body 2 closed with the lid 3 can be attached to the case 11. The terminal block 23 can also be attached before the terminal box body 2 is fixed to the case 11, and the order is not limited thereto.

[0029] To ensure that the other end of the support column 72 abuts against the inner surface of the lid 3, the height of the support column 72 must be higher than the wall 22 of the terminal box body 2. The height of the support column 72 is set lower than the combined height of the wall 22 and the thickness of the first gasket 4. The difference between the height of the support column 72 and the combined height of the wall 22 and the thickness of the first gasket 4 is set within a range that allows the first gasket 4 to be compressed. Thus, when the lid 3 is fixed to the terminal box body 2 with the head screws 6, the first gasket 4 is compressed, allowing the inner surface of the lid 3 to abut against the other end of the support column 72 of the screw-integrated support column 7. As a result, the lid 3 and the screw-integrated support column 7 are electrically connected. At this time, the screw-integrated support column 7 is also electrically connected to the terminal box body 2 and the terminal box seat 12 of the case 11.

[0030] The electrical continuity between the lid 3, the terminal box body 2, and the case 11 when the terminal box body 2 is fixed to the case 11 will be described in detail using FIG. 12, a schematic cross-sectional view showing the electrical continuity of the terminal box 1. In FIG. 12, the locations where each component is electrically connected to the other are indicated by double-headed arrows A to F. FIG. 12(a) shows the initial state when the terminal box body 2 is fixed to the case 11, before the first gasket 4 and the second gasket 5 have deteriorated over time. As shown in FIG. 12(a), in the initial state of the terminal box body 2 when the lid 3 is fixed to the case 11 with the head screws 6, the heads of the head screws 6 abut against the lid 3, thereby establishing electrical continuity between the head screws 6 and the lid 3 (double-headed arrow A). Furthermore, the shafts of the head screws 6 are threadably engaged with the terminal box body 2, thereby establishing electrical continuity between the head screws 6 and the terminal box body 2 (double-headed arrow B). In this way, the head screws 6 establish electrical continuity between the lid 3 and the terminal box body 2 (double-headed arrows A and B). Since the abutment portion 211 abuts against the terminal box seat portion 12 of the case 11, the terminal box body 2 is directly electrically connected to the case 11 (double arrow C). As a result, the lid 3 is electrically connected to the case 11 via the head screw 6 and the terminal box body 2 (double arrows A, B, C).

[0031] Because the inner surface of the lid 3 abuts against the screw-integrated support post 7, the lid 3 is also electrically connected to the screw-integrated support post 7 (double arrow D). Because the threaded portion 71 of the screw-integrated support post 7 is threadably engaged with the threaded hole 122 of the terminal box seat portion 12 of the case 11, the screw-integrated support post 7 is also electrically connected to the case 11 (double arrow E). Furthermore, because the seat surface of one end of the support portion 72 of the screw-integrated support post 7 abuts against the bottom portion 21 of the terminal box body 2, the screw-integrated support post 7 is also electrically connected to the terminal box body 2 (double arrow F). In this way, because the screw-integrated support post 7 is electrically connected to the terminal box body 2 and the case 11, the lid 3 is electrically connected to the terminal box body 2 and the case 11 via the screw-integrated support post 7 (double arrows D, F, E). Therefore, the lid 3 is electrically connected to the case 11 through multiple electrical paths. The terminal box body 2 is electrically connected to the case 11 not only through the contact portion 211 but also through the screw-integrated support posts 7. In this way, the terminal box body 2 is also electrically connected to the case 11 through a plurality of routes. In the terminal box 1 of this embodiment, the electrically connected state shown in FIG. 12(a) occurs at each of the screw-integrated support posts 7 of the terminal box 1, so that a greater number of electrically connected routes (double arrows A to F) are ensured. In this way, in the terminal box 1 of this embodiment, the lid 3, terminal box body 2, and case 11 are electrically connected to one another through various electrically connected routes.

[0032] Fig. 12(b) shows the electrical continuity of the terminal box 1 of this embodiment when the first packing 4 and the second packing 5 deteriorate over time and become thinner. In Fig. 12(b), the terminal box 1 of this embodiment supports the lid 3 with the screw-integrated support posts 7. Therefore, even if the thickness of the first packing 4 becomes thinner, the lid 3 does not move downward. Therefore, the heads of the head screws 6 remain in contact with the lid 3, and the head screws 6 maintain electrical continuity with the lid 3 (double arrow A). At the same time, because the lid 3 is in contact with the screw-integrated support posts 7, electrical continuity with the screw-integrated support posts 7 (double arrow D) is also maintained. Furthermore, because the abutment portion 211 of the terminal box body 2 abuts against the case 11, the terminal box body 2 does not move downward even if the thickness of the second packing 5 is reduced, and therefore the seat surface of one end of the support portion 72 of the screw-integrated support 7 remains in abutment with the terminal box body 2, and the terminal box body 2 maintains electrical continuity with the screw-integrated support 7 (double arrow F). Furthermore, electrical continuity between the abutment portion 211 of the terminal box body 2 and the case 11 (double arrow C) is ensured, and electrical continuity between the screw-integrated support 7 and the case 11 (double arrow E) is also ensured. In this way, the positional changes of the lid 3 and terminal box body 2 that would conventionally occur when the thicknesses of the first packing 4 and second packing 5 are reduced are prevented by the abutment portion 211 of the screw-integrated support 7 and the terminal box body 2. The positional relationship between the terminal box 1, the lid 3, the terminal box main body 2, and the case 11 does not change depending on the state of the first packing 4 and the second packing 5. Therefore, the electrical continuity state of the terminal box 1 indicated by the double arrows A to F in FIG. 12(b) is the same as the electrical continuity state in FIG. 12(a). Therefore, in the terminal box 1 of this embodiment, even if the first packing 4 and the second packing 5 deteriorate, the electrical continuity state (indicated by the double arrows A to F) between the lid 3, the terminal box main body 2, and the case 11 does not change. Therefore, the terminal box 1 of this embodiment can always ensure multiple electrical continuity routes (indicated by the double arrows A to F) between the lid 3, the terminal box main body 2, and the case 11 regardless of the state of the first packing 4 and the second packing 5, thereby achieving the excellent effect of ensuring stable electrical continuity over a long period of time. [Industrial Applicability]

[0033] The present invention is applicable to, for example, a terminal box of a motor such as a pump. [Explanation of symbols]

[0034] 1 Terminal box 2 Terminal box body 21 Bottom 211 Contact part 212 Non-contact part 213 Opening 214 Through hole 215 units 22 Wall 221 screw hole 222 Opening 223 Fitting connection port 23 Terminal block 3 Lid 31 Through hole 4. First packing 41 Through hole 5 Second packing 51 Through hole 52 Notch 6 head screws 7. Integrated screw support 71 Threaded part 72 Pillar section 10 Motor 11 cases 12 Terminal box seat 121 Wall 122 screw holes 13 Opening 14 Earth screw 15 Stator 16 rotors 17 Rotation axis 18 Outside fan 19 External fan cover

Claims

1. a terminal box body that houses a terminal block therein and is attached to a motor case; a lid for closing the opening of the terminal box body; a first packing provided between the terminal box body and the lid; a second packing provided between the case and the terminal box body; a head screw for fixing the lid to the terminal box body; a screw-integrated support for fixing the terminal box body to the case; A terminal box comprising: The screw-integrated support column has a support column portion and a threaded portion provided at one end of the support column portion, and the threaded portion is provided at the one end so as to form a seat surface that presses against a fastened member, When the terminal box body is fixed to the case by the screw-integrated support, the terminal box body forms a contact portion that contacts the case to allow electrical continuity and a non-contact portion that does not contact the case and forms a space between the case and the contact portion, the second packing is disposed in the space formed between the case and the non-contact portion, When the lid is fixed to the terminal box body by the head screw, the lid abuts against the other end of the support post. A terminal box characterized by:

2. When the abutting portion abuts against the case, the second packing is compressed, 2. The terminal box according to claim 1, wherein the first packing is compressed when the other end of the support pole abuts against the inner surface of the lid.

3. A motor having the terminal box according to claim 1 or 2, The motor is characterized in that the terminal box is fixed to the case of the motor by the screw-integrated support.

4. 4. The motor according to claim 3, wherein a terminal box seat is provided on the outer periphery of the case, and the terminal box is attached to the terminal box seat.

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