Rotary electric machine

Abstract

To provide a rotary electric machine which can further improve pressure-resistant explosion-proof performance.SOLUTION: A rotary electric machine comprises a housing, a screw receiving part, and a female screw part. The housing has a first member and a second member. The second member is removed from the first member when it is moved in a first direction with respect to the first member. The first member has a first bonding surface. The second member has: a second bonding surface facing the first bonding surface; and a fitting part b. When viewed along the first direction, the screw receiving part is located outside the first bonding surface. When viewed along the first direction, the female screw part is located outside the second bonding surface.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine.

Background Art

[0002] Conventionally, a rotating electrical machine including a rotating electrical machine body and a terminal box has been known. In a pressure-resistant explosion-proof motor, which is a type of rotating electrical machine, for example, when an explosion occurs inside the rotating electrical machine, a design is made to prevent sparks from reaching the outside of the housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a conventional rotating electrical machine called a pressure-resistant explosion-proof motor, in order to prevent sparks generated inside the rotating electrical machine from reaching the outside of the housing, a measure is taken to design a long gap connecting the inside and outside of the housing. In this type of rotating electrical machine, it would be beneficial if the pressure-resistant explosion-proof performance could be further improved.

[0005] An example of the problem to be solved by the present invention is to obtain a rotating electrical machine capable of further improving the pressure-resistant explosion-proof performance.

Means for Solving the Problems

[0006] The rotating electrical machine according to an embodiment of the present invention includes a first member provided with an opening, a second member fitted into the opening, closing the opening, and removed from the first member by being moved in a first direction with respect to the first member, a housing having the second member, a screw receiving portion provided on the first member for receiving a tip portion of a male screw member, and a female screw portion provided on the second member, positioned on the first direction side with respect to the screw receiving portion and coupled to the male screw member, for converting a rotational movement of the male screw member in one rotational direction into a linear movement of the second member in the first direction with respect to the first member. The first member has an inner peripheral surface forming the opening and an endless first joint surface projecting in a direction intersecting the first direction from the inner peripheral surface. The second member has an endless second joint surface facing the first joint surface and a fitting portion projecting in a direction opposite to the first direction from the second joint surface and fitted into the opening. The screw receiving portion is located outside the first joint surface when viewed along the first direction, and the female screw portion is located outside the second joint surface when viewed along the first direction.

Advantages of the Invention

[0007] According to the rotating electrical machine of the present invention, a rotating electrical machine capable of further improving pressure resistance and explosion protection can be obtained.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Best Mode for Carrying Out the Invention

[0009] Embodiments will be described below with reference to the drawings. In this specification, the components according to the embodiments and the descriptions of those components may be described in a plurality of expressions. The components and their descriptions are examples and are not limited by the expressions in this specification. The components may be specified by different names from those in this specification. Also, the components may be described by expressions different from those in this specification.

[0010] Also, the drawings are schematic, and the dimensional relationships between the respective elements, the ratios of the respective elements, etc. may be different from the actual ones. Also, there may be parts where the dimensional relationships and ratios between the drawings are different from each other.

[0011] FIG. 1 is a diagram showing a rotating electrical machine 1 according to this embodiment. The rotating electrical machine 1 according to this embodiment is, for example, a pressure-resistant explosion-proof rotating electrical machine. The pressure-resistant explosion-proof rotating electrical machine is a motor or a generator. As shown in FIG. 1, the rotating electrical machine 1 includes a rotating electrical machine main body 2 and a terminal box 3.

[0012] The rotating electrical machine main body 2 includes a housing 11, a stator 12, a shaft 13, a rotor 15, and a sensor 16.

[0013] The housing 11 is formed in a box shape from, for example, metal. Note that the housing 11 may be formed of other materials. The housing 11 houses the stator 12, a part of the shaft 13, the rotor 15, and the sensor 16. The housing 11 is constituted by, for example, a combination of a plurality of members.

[0014] The stator 12 has a stator core and a stator winding. The stator core is fixed to the housing 11. The stator core is located outside the rotor 15 in the radial direction and is formed in a cylindrical shape surrounding the rotor 15. The stator winding penetrates through a plurality of slots formed in the stator core so as to extend in the axial direction and is fixed to the stator core.

[0015] The shaft 13 is rotatably supported by the housing 11 via two bearings. In other words, the two bearings rotatably support the shaft 13 with respect to the housing 11. The shaft 13 extends through the housing 11. One end of the shaft 13 is coupled to, for example, various external devices. Thereby, when the shaft 13 rotates, the external device is driven.

[0016] The rotor 15 is housed inside the housing 11. The rotor 15 is formed in a substantially cylindrical shape extending in the axial direction of the shaft 13 and is arranged substantially concentrically with the stator 12. The rotor 15 is arranged inside the stator 12 with a gap therebetween. The rotor 15 has, for example, a plurality of permanent magnets. The rotor 15 is coupled to the shaft 13 and rotates integrally with the shaft 13.

[0017] The stator 12 and the rotor 15 are not limited to the above-described configuration as long as they can generate a rotational force by electromagnetic force. For example, the rotor 15 may have a rotor core made of a magnetic material and a conductor attached to the rotor core.

[0018] The sensor 16 can detect, for example, the state inside the housing 21. The state inside the housing 21 is, for example, the temperature and humidity inside the housing 21.

[0019] As shown in FIG. 1, the terminal box 3 is located outside the rotating electric machine main body 2 and is attached to the housing 11.

[0020] The terminal box 3 includes a housing 21 and a housed component 22. The housing 21 is fixed to the housing 11 of the rotating electric machine main body 2. The housing 21 of the terminal box 3 and the housing 11 of the rotating electric machine main body 2 constitute a housing 4. The housing 4 is also referred to as a housing.

[0021] The housing component 22 is housed inside the housing 21. The housing component 22 is, for example, a terminal block and has a base and terminals. The terminals of the housing component 22 are electrically connected to the sensor 16 and the stator core of the stator 12 via the cable 23. Also, the terminals of the housing component 22 are electrically connected to an external device via an external connection member.

[0022] Next, the housing 21 of the terminal box 3 will be described in detail. FIG. 2 is a front view showing the terminal box 3 of the rotating electric machine 1 according to the embodiment. FIG. 3 is a cross-sectional view showing the terminal box 3 according to the embodiment. FIG. 4 is a front view showing the housing body 31 of the housing 21 of the terminal box 3 according to the embodiment. FIG. 5 is a rear view showing the lid 32 of the housing 21 of the terminal box 3 according to the embodiment.

[0023] In this specification, for convenience, the X-axis, Y-axis, and Z-axis are defined. The X-axis, Y-axis, and Z-axis are perpendicular to each other.

[0024] Furthermore, in this specification, the X-direction, Y-direction, and Z-direction are defined. The X-direction is the direction along the X-axis and includes the +X direction indicated by the arrow of the X-axis and the -X direction opposite to the arrow of the X-axis. The Y-direction is the direction along the Y-axis and includes the +Y direction indicated by the arrow of the Y-axis and the -Y direction opposite to the arrow of the Y-axis. The Z-direction is the direction along the Z-axis and includes the +Z direction indicated by the arrow of the Z-axis and the -Z direction opposite to the arrow of the Z-axis.

[0025] As shown in FIGS. 2 and 3, the housing 21 of the terminal box 3 has a housing body 31, a lid 32, and a plurality of connectors 33. The lid 32 is fitted into the opening 34 of the housing body 31 and closes the opening 34. The lid 32 is detachably fixed to the housing body 31 by a connector 33 such as a bolt. The lid 32 is removed from the housing body 31 by being moved in the +X direction with respect to the housing body 31 in a state where the connector 33 is removed. The housing body 31 is an example of a first member, and the lid 32 is an example of a second member. The +X direction is an example of a first direction.

[0026] As shown in FIGS. 3 and 4, the housing main body 31 has a cylindrical portion 31a, an end wall portion 31b, and a fixing portion 31c. Further, an opening 34 is provided in the housing main body 31. The opening 34 is a recess that opens in the +X direction and is recessed in the -X direction. The housing component 22 is housed in the opening 34. The opening 34 is closed by a lid 32.

[0027] The cylindrical portion 31a is formed in a cylindrical shape around the center line L1. Here, the X-axis is along the center line L1. A through hole 35 is provided in the cylindrical portion 31a. The through hole 35 communicates with the internal space of the housing 11 of the rotary electric machine main body 2. A cable 23 (FIG. 1) is inserted into this through hole 35.

[0028] The end wall portion 31b is connected to the -X direction side end of the cylindrical portion 31a. The end wall portion 31b extends in a direction (Y-Z plane) intersecting the X direction.

[0029] The fixing portion 31c is connected to the +X direction side end of the cylindrical portion 31a. The fixing portion 31c is formed in an endless shape (annular shape) around the center line L1. A plurality of female screw portions 45 are provided in the fixing portion 31c. The female screw portion 45 is coupled to the coupling tool 33.

[0030] Further, the housing main body 31 has an inner peripheral surface 31e and a joint surface 31d. The inner peripheral surface 31e is formed in a cylindrical surface shape around the center line L1. The inner peripheral surface 31e surrounds the opening 34. In other words, the inner peripheral surface 31e forms the opening 34. The joint surface 31d is also referred to as an explosion-proof surface or a mating surface.

[0031] The joint surface 31d includes a joint surface 31da and a joint surface 31db. The joint surface 31db is provided in the fixing portion 31c and is formed in a cylindrical surface shape around the center line L1. The joint surface 31d constitutes the +X direction side end portion of the inner peripheral surface 31e. That is, the joint surface 31db is included in the inner peripheral surface 31e.

[0032] The joint surface 31da is provided on the fixing portion 31c and faces the +X direction. The joint surface 31da projects in a direction intersecting (orthogonal in one example) the +X direction from the joint surface 31db, i.e., the inner peripheral surface 31e. The joint surface 31da is formed in an endless (annular) shape around the center line L1. A female screw portion 45 opens on this joint surface 31da. The joint surface 31da is an example of the first joint surface.

[0033] Also, the housing body 31 is composed of a plurality of body members 41 to 44. The body member 41 includes a part of the cylindrical portion 31a, a part of the end wall portion 31b, and the fixing portion 31c. The body member 42 includes a part of the end wall portion 31b. The body member 43 includes the cylindrical portion 31a. The body member 44 includes the cylindrical portion 31a.

[0034] As shown in FIGS. 3 and 5, the lid 32 has a base portion 32a and a fitting portion 32b.

[0035] The base portion 32a is in the shape of a disc that spreads in a direction intersecting (orthogonal in one example) the X direction. The base portion 32a has a joint surface 32da. The joint surface 32da faces the -X direction. The joint surface 32da is formed in an endless (annular) shape around the center line L1. The joint surface 32da faces the joint surface 31da of the housing body 31. The joint surface 32da is an example of the second joint surface.

[0036] The fitting portion 32b projects in the -X direction, which is the opposite direction of the +X direction, from the joint surface 32da. The fitting portion 32b is fitted into the opening 34. The fitting portion 32b is also referred to as a convex portion.

[0037] The fitting portion 32b has a joint surface 32db. The joint surface 31db is provided on the outer peripheral surface of the fitting portion 32b and is formed in a cylindrical surface shape around the center line L1. The joint surface 32db faces the joint surface 31db of the housing body 31. The joint surface 32da and the joint surface 32da constitute the joint surface 32d.

[0038] Further, a plurality of through holes 51 are provided in the base portion 32a. The through holes 51 penetrate the joint surface 32da.

[0039] Next, the separation structure of the terminal box 3 will be described. FIG. 6 is a cross-sectional view showing the separation structure 50 in the terminal box 3 of the embodiment.

[0040] As shown in FIGS. 4, 5, and 6, the separation structure 50 includes a plurality (two in this example) of convex portions 37 provided on the housing main body 31, a plurality (two in this example) of convex portions 52 provided on the lid 32, and a male screw member 61. The convex portion 37 is an example of the first convex portion, and the convex portion 52 is an example of the second convex portion. The male screw member 61 is also referred to as a jack bolt.

[0041] As shown in FIG. 6, the male screw member 61 is, for example, a bolt. The male screw member 61 has a head portion 61a and a shaft portion 61b. The shaft portion 61b protrudes from the head portion 61a. A male screw portion 61c is provided on the outer peripheral surface of the shaft portion 61b. The male screw member 61 may be removed during the operation of the rotating electrical machine 1.

[0042] The convex portion 37 protrudes from the outer surface 31f of the housing main body 31. The convex portion 37 has a surface 37a facing the +X direction. The surface 37a includes a screw receiving portion 37aa. The screw receiving portion 37aa receives the tip portion 61d (the tip portion 61d of the shaft portion 61b) of the male screw member 61. In other words, the tip portion 61d of the male screw member 61 is applied to the screw receiving portion 37aa. The screw receiving portion 37aa is also referred to as a jack bolt seat.

[0043] The two convex portions 37 are located outside the joint surface of the joint surface 31da1 along the line of sight in the +X direction and are arranged with the joint surface 31da interposed therebetween. As a result, the screw receiving portion 37aa is located outside the joint surface of the joint surface 31da1 and is arranged with the joint surface 31da interposed therebetween.

[0044] The convex portion 52 protrudes from the outer surface 32f of the lid 32m. The convex portion 52 is located on the +X direction side with respect to the convex portion 37.

[0045] The convex portion 52 is provided with an internal thread portion 53. The internal thread portion 53 is located on the +X direction side with respect to the thread receiving portion 37aa. The internal thread portion 53 is coupled to the external thread portion 61c of the external thread member 61. The external thread portion 61c converts the rotational movement of the external thread member 61 in one rotational direction into a linear movement of the lid 32 in the +X direction with respect to the housing body 31.

[0046] The plurality of convex portions 52 are located outside the joint surface 32da when viewed along the +X direction and are arranged with the joint surface 32da interposed therebetween. Accordingly, the plurality of internal thread portions 53 are located outside the joint surface 32da when viewed along the +X direction and are arranged with the joint surface 32da interposed therebetween.

[0047] In the above configuration, when removing the lid 32 from the housing body 31, the operator couples the external thread member 61 to the internal thread portion 53 and rotates the external thread member 61 in one rotational direction to screw it in. When the external thread member 61 moves in the -X direction while rotating and the tip portion 61d hits the thread receiving portion 37aa, the movement of the external thread member 61 in the -X direction stops, and the rotational movement of the external thread portion 61c in one rotational direction by the internal thread portion 53 is converted into a linear movement of the lid 32 in the +X direction with respect to the housing body 31. Therefore, even if the lid 32 is firmly fitted to the housing body 31, the lid 32 can be relatively easily removed from the housing body 31.

[0048] Even if an explosion occurs in the housing 4 (housing 11, 21) of the rotating electric machine 1 which is an explosion-proof motor, it is possible to suppress the spark from reaching the outside of the housing 11. The following description will explain the case where an explosion occurs inside the terminal box 3. Note that the rotating electric machine 1 has various configurations capable of suppressing an explosion from occurring in the housing 4.

[0049] As shown in FIG. 3, gaps G1 and G2 may be provided between the housing body 31 and the lid 32. The gap G1 is provided between the joint surface 31da and the joint surface 32da. The gap G2 is provided between the joint surface 31db and the joint surface 32db.

[0050] If an explosion occurs inside the housing 21, there is a risk that sparks may enter the gaps G1 and G2. However, pressure loss occurs as the sparks pass between the gaps G1 and G2. Also, the sparks collide with the housing 21 at the portion where the gap G1 and the gap G2 are connected, causing pressure loss. Therefore, the rotating electrical machine 1 can extinguish the sparks at the gap G2.

[0051] At this time, in the present embodiment, since the male screw portion 61c is provided outside the joint surface 32db, shortening of the joint surface 32db is suppressed. Thus, the pressure resistance and explosion-proof performance are further improved.

[0052] As described above, in the present embodiment, the rotating electrical machine 1 includes a housing 21, a screw receiving portion 37aa, and a female screw portion 53. The housing 21 has a housing body 31 (first member) and a lid 32 (second member). An opening 34 is provided in the housing body 31. The lid 32 is fitted into the opening 34, closes the opening 34, and is removed from the housing body 31 (first member) by being moved in the +X direction (first direction) with respect to the housing body 31. The screw receiving portion 37aa is provided in the housing body 31 and receives the tip portion 61d of the male screw member 61. The female screw portion 53 is provided in the lid 32, is located on the +X direction side with respect to the screw receiving portion 37aa, and is coupled to the male screw member 61, converting the rotational movement of the male screw member 61 in one rotational direction into a linear movement of the lid 32 in the +X direction with respect to the housing body 31. The housing body 31 has an inner peripheral surface 31e that forms the opening 34 and an endless joint surface 31da (first joint surface) that projects from the inner peripheral surface 31e in a direction intersecting the +X direction. The lid 32 has an endless joint surface 32da (second joint surface) facing the joint surface 31da and a fitting portion 32b that projects from the joint surface 32da in the opposite direction of the +X direction and is fitted into the opening 34. The screw receiving portion 37aa is located outside the joint surface 31da when viewed along the +X direction. The female screw portion 53 is located outside the joint surface 32da when viewed along the +X direction.

[0053] According to such a configuration, the rotating electrical machine 1 of the present embodiment can further improve the pressure resistance and explosion-proof performance.

[0054] Further, the screw receiving portion 37aa is arranged with the joint surface 31da therebetween when viewed along the +X direction. The female screw portion 53 is arranged with the joint surface 32da therebetween when viewed along the +X direction.

[0055] With such a configuration, it is even easier to remove the lid 32.

[0056] The embodiments of the present invention have been described above. However, the above embodiments are merely examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the gist of the invention. Also, specifications such as each configuration, shape, etc. (structure, type, direction, form, size, length, width, thickness, height, number, arrangement, position, material, etc.) can be appropriately changed and implemented.

Description of Reference Numerals

[0057] 1... rotating electrical machine, 21... housing, 31... housing main body (first member), 31da... joint surface (first joint surface), 31e... inner peripheral surface, 32... lid (second member), 32da... joint surface (second joint surface), 32b... fitting portion, 34... opening, 37... convex portion (first convex portion), 37aa... screw receiving portion, 52... convex portion (second convex portion), 53... female screw portion, 61... male screw member, 61d... tip portion.

Claims

1. A housing having a first member provided with an opening, and a second member fitted into the opening to close the opening and removed from the first member by being moved in a first direction with respect to the first member; A screw receiving portion provided on the first member for receiving a tip portion of a male screw member; A female screw portion provided on the second member, located on the first direction side with respect to the screw receiving portion and coupled to the male screw member, for converting a rotational movement of the male screw member in one rotational direction into a linear movement of the second member in the first direction with respect to the first member; Comprising; The first member has An inner peripheral surface forming the opening; An endless first joint surface projecting in a direction intersecting the first direction from the inner peripheral surface; And has; The second member has An endless second joint surface facing the first joint surface; A fitting portion projecting in a direction opposite to the first direction from the second joint surface and fitted into the opening; And has; The screw receiving portion is located outside the first joint surface when viewed along the first direction; The female screw portion is located outside the second joint surface when viewed along the first direction; A rotating electrical machine.

2. The screw receiving portions are arranged with the first joint surface therebetween when viewed along the first direction; The female screw portions are arranged with the second joint surface therebetween when viewed along the first direction; The rotating electrical machine according to Claim 1.

3. A first convex portion projecting from the first member; A second convex portion projecting from the second member; Comprising; The screw receiving portion is provided on the first convex portion; The female screw portion is provided on the second convex portion; The rotating electrical machine according to Claim 1.

4. Comprising a terminal box having the housing; The rotating electrical machine according to any one of Claims 1 to 3.

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