JPH0237254Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement in a winding protector mounting device for a rotating electric machine that attaches a winding protector to a terminal box provided in a frame of a rotating electric machine.

[Technical background of the invention and its problems]

Conventional winding protectors include bimetallic thermosensitive elements that operate at a predetermined temperature, thermistors that utilize rapid changes in resistance due to temperature, and thermal protectors that sense a predetermined temperature and current. In three-phase motors, there is a strong tendency to frequently use thermal protectors, which have stable characteristics and do not require an external operation circuit.

By the way, this thermal protector can be installed either inside the rotating electric machine or on the terminal box of the rotating electric machine.In the former case, the internal space of the rotating electric machine must be enlarged, so in the latter case, it is not recommended. Often used. The mounting structure can be roughly divided into the structure shown in FIGS. 5 and 6 and the structure shown in FIGS. 7 and 8. That is, in the case shown in FIGS. 5 and 6, an insertion hole 4 is formed in the wall plate 3 of a terminal box 2 to which a frame 1 of a rotating electric machine is attached.
The thermal protector 5 is inserted and screwed into the terminal, and the lead wire 6 from the middle contact point of the winding is connected to the terminal (not shown) on the back side of the thermal protector 5.
The connecting portion is covered with an insulating cover 5a. On the other hand, in the case shown in FIGS. 7 and 8, a mounting plate 7 is mounted inside the terminal box 2 with terminal box 2 mounting screws, and a thermal protector 5 is screwed to this mounting plate 7. The configuration is such that the back surface connection portion is covered with an insulating cover 5a.

However, in the former case, thermal protector 5
is exposed to the terminal box 2, there is a problem of water droplets and dust adhering to or entering the thermal protector 5, which is unfavorable from a safety standpoint. Since the push button 8 is provided, there is a risk that the water droplets and dust may enter the inside of the thermal protector 5 from the push button 8 portion. Moreover, in the latter case, since the mounting direction of the thermal protector 5 is in the left-right direction, that is, the direction perpendicular to the original direction of leading out the lead wire of the rotating electric machine (to the right as shown by arrow A in FIG. 7), the lead wire This causes an inconvenience in that the attachment of the thermal protector 5 is obstructed, and the lead wire has to be bent as shown in FIG. 7, making the wiring process troublesome. Furthermore, as can be seen from FIG. 8, since the screw fixing point a of the mounting plate 7 and the thermal protector 5 overlap when viewed from above, the thermal protector 5 can only be mounted after the mounting plate 7 has been mounted. There is a problem that the assembly process is restricted and the number of parts is large, resulting in a general decrease in productivity. Furthermore, in both the former and the latter,
There was also a drawback that there was a risk that the insulating cover 5a would fall off from the thermal protector 5, and the reliability of the insulation was low.

[Purpose of invention]

The present invention was developed in view of the above circumstances, and its purpose is to prevent water droplets and dust from adhering to or entering the winding protector, to improve productivity, and to improve insulation. An object of the present invention is to provide a highly reliable winding protector mounting device for a rotating electric machine.

[Summary of the idea]

The present invention includes a storage part that has a cylindrical shape with an open end and a bottom for fitting and enclosing the connection part of the winding protector, and having an opening for passing the lead wire through the peripheral wall of the storage part; a mounting seat protruding from the open opening side of the storage section to mount and fix the winding protector; a leg extending from the mounting seat and attaching to the terminal box; The number of parts is reduced by integrally forming the leg part and the receiving part that protrudes to be flush with the inner surface of the terminal box and comes into contact with the inner surface of the terminal box. By installing the winding protector inside the terminal box in a direction substantially parallel to the lead-out direction of the lead wire of the rotating electric machine, the winding protector is drip-proof and dust-proof, and assembly workability is improved. It is distinctive in that it aims to

[Example of idea]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. First, in FIGS. 1 and 2, 11 is a frame of a rotating electric machine, to which a terminal box 12 is attached with screws 13;
2a is its lid. This lid 12a is formed with a push button operation hole 12b, and this hole 12b is provided with a cap 12c. 14 is a lead wire led out from the frame 11 into the terminal box 12.
Reference numeral 15 denotes a mounting base, which, as shown in FIGS. 3 and 4, includes a storage section 16 having a cylindrical shape with a bottom, and mounting seats 17, 17 that protrude left and right from the open opening side of this storage section 16. , legs 1 extending from the mounting seats 17, 17 in the same direction via diagonal pieces 18a.
8, 18, and a receiving portion 19 which protrudes from the outer bottom of the housing portion 16 and comes into contact with the inner surface of the terminal box 12, are formed of synthetic resin. A vertically elongated opening 16a for inserting the lead wire is formed in the middle part of the peripheral wall of the storage part 16, and the receiving part 19 and the leg parts 18, 18 are formed on the same plane. has been done. In Figures 1 and 2, 20 is a thermal protector which is a winding protector, and this has attached parts 2 on its left and right sides.
1 and 21, and has a push button 22 for manual return at one end, and a terminal (not shown) at the other end. 23 is a lead wire derived from the neutral point of the three-phase line of the rotating electric machine, and this is connected to the thermal protector 2.
Connected to the 0 terminal.

Then, the thermal protector 20 is attached to the terminal box 12.
When installing the thermal protector 20 on the mounting base 17, the connecting portion 24 of the thermal protector 20 is fitted into the housing 16 of the mounting base 15 and surrounded by the housing 16.
The legs 1 of the mounting base 15 are fixed with screws 25 to 17, and this thermal protector 20 is integrated.
8 and 18, and the frame 11 of the terminal box 12 by the screw 13 in a state where the thermal protector 20 is parallel to the lead-out direction of the lead wire 14.
It is attached inside this terminal box 12 by attaching it to. In this case, the legs 18, 18 and the receiving part 19 abut against the wall plate part. Therefore, when the push button 22 is pressed in the direction of arrow B, the receiving portion 19 receives the pressing force, thereby maintaining the strength and stability of the mount.

According to this embodiment, the following effects can be obtained.

() Since the entire thermal protector 20 is attached inside the terminal box 12, the thermal protector 20 can be protected from water droplets and dust, and safety can be improved.

() Since the storage part 16 surrounding the connection part 24 of the thermal protector 20 is integrally formed on the mounting base 15 made of synthetic resin, which is an insulating material, the connection part 24 can be insulated by the mounting base 15. This eliminates the need for the insulating cover that was previously required, thereby reducing the number of parts, eliminating the work of installing the insulating cover that was previously required, and eliminating problems such as the insulating cover falling off. , insulation reliability is also high.

() Connect the thermal protector 20 to lead wire 1
4, the thermal protector 20 can be installed without being obstructed by the lead wire 14, the space inside the terminal box 12 can be used effectively, and wiring processing is also facilitated.

() The legs 18, 18 of the mounting base 15, which are attached to the terminal box 12, are connected to the thermal protector 20.
Since the two legs 18, 18 and the mounting seat 1 extend from the mounting seats 17, 17 for attaching the
7 and 17 do not overlap in a plane,
Therefore, the thermal protector 20 is attached to the mounting base 15.
It is also possible to adopt the assembly procedure of attaching the mounting base 15 to the terminal box 12 after installing the
Further, it is also possible to adopt an assembly procedure in which the thermal protector 20 is attached to the mounting base 15 after the mounting base 15 is attached to the terminal box 12, which increases the degree of freedom in selecting the assembly process, and in particular, it is preferable to adopt the former assembly procedure. Therefore, the assembly process can be performed in parallel and at the same time, and overall assembly work and productivity can be improved.

[Effect of idea]

As is clear from the above description, in the present invention, since the winding protector is installed inside the terminal box, the winding protector can be reliably drip-proof and dust-proof, improving safety. Since the winding protector is installed parallel to the lead-out direction of the lead wire of the rotating electric machine via the mounting base, the winding protector can be easily installed, and the wiring inside the terminal box can be easily processed. Since the winding protector can be installed and insulated using the mounting base, the number of parts can be reduced, the insulation is highly reliable, and the assembly process has a high degree of freedom in selection, which improves productivity overall. It has various excellent effects such as improving

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention,
FIG. 1 is a longitudinal sectional side view of the terminal box portion, FIG. 2 is a front view of the terminal box portion with the lid removed, and FIGS. 3 and 4 are a perspective view and a side view of the mounting base. Figures 5 and 6 show a conventional example, Figure 5 is a front view of a partially broken terminal box part, Figure 6 is a side view of the terminal box part, and Figures 7 and 8 are different conventional examples. They are a diagram corresponding to FIG. 1 and a diagram corresponding to FIG. 2, respectively, showing an example. In the figure, 11 is a frame, 12 is a terminal box, 14 is a lead wire, 15 is a mounting base, 16 is a storage part, 16a
17 is an opening, 17 is a mounting seat, 19 is a receiving portion, 20 is a thermal protector (winding protector), and 24 is a connecting portion.

Claims (1)

[Scope of utility model registration request] A winding protector is attached to a terminal box provided in the frame of a rotating electric machine, and the winding protector has a cylindrical shape with an open end and a bottom that fits and surrounds the connection part of the winding protector, and a lead wire is attached to the peripheral wall of the cylindrical shape with an open end. a storage section having an opening for insertion; a mounting seat that protrudes from the open opening side of the storage section to mount and fix the winding protector; and a mounting seat that extends from the mounting seat and is attached to the terminal box. A mounting base made of synthetic resin is provided which integrally includes a leg portion and a receiving portion that protrudes from the outer bottom surface of the storage portion so as to be flush with the leg portion and comes into contact with the inner surface of the terminal box, A winding protector mounting device for a rotating electrical machine, characterized in that the winding protector is mounted inside the terminal box via a stand in a direction substantially parallel to a lead-out direction of a lead wire of the rotating electrical machine.