JPS6028741A - Liquid-sealed motor - Google Patents

Abstract

PURPOSE:To enable to reduce the quantity of sealed insulating oil and to suppress the temperature rise of a stator by providing a pressure regulating mamber coupled with a frame in a can, and sealing insulating particles around the stator. CONSTITUTION:When insulating oil B around a stator 2 largely expands due to temperature rise, the expansion of the volume is released through the hole of a case 25 into the case 25, and an elastic material in the case 25 is inwardly compressed. Thus, the pressure difference between the interior and the exterior of the can 3 is almost eliminated. Since insulating particles 33 are sealed around the stator 2, the quantity of the oil B can be reduced. The particles 33 dissipate the heat of a coil end to a frame 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a liquid-sealed electric motor in which lubricating oil is inserted around the rotor and insulating oil is installed around the stator.

A conventionally known device of this kind will be explained with reference to FIG. In the figure, (1) is a cylindrical frame, (2) is a stator fixed to the inner periphery of this frame 11+, and (3) is a cylindrical camp placed on the inner periphery of this stator (2). ,(
4) and (5) are this can (3) and the above frame 11
An upper tsuba and an upper tsuba each watertightly connected to both ends of + (
6) and (7) are the upper bracket (8) and (9) which are watertightly connected to the upper tsuba (4) and the upper tsuba (5), respectively. ), the upper bearing (8) and the lower bearing (11) H are fitted over the upper bearing (8) and the lower bearing (9), respectively, and the upper bracket (6) and They are an upper communication groove and a lower communication groove formed in the lower bracket (7), respectively, and the lower communication groove (11
) is formed passing through the lower bracket (7). (12) is a rotor supported by the upper bearing (8) and lower bearing (9), and Kasumi is a shaft that is placed on the upper bracket (6) and seals the shaft (14) of the rotor (12). The sealing device (15) is a thrust case which is connected to the lower bracket (7) at one end, has a cylindrical shape at both ends, and has a wall H in the center. A communicating hole (1η) is formed through the (+barrel) is a thrust bearing that receives the thrust load of the above wall (supported by the above shaft 04), (1'J is a communicating hole (1η) of the above thrust case O). A diaphragm watertightly fitted to the other end regulates the pressure in the lubricating oil in the can (3) via the communication groove (11). - indicates the upper bracket (6).
) is a power supply cable that is watertightly connected to the stator (2) and supplies electricity to the stator (2). Note that insulating oil (Bl) is applied around the stator (2).
is included.

In the configuration as described above, the stator (2) is energized from the power supply cable, the rotor (12) rotates, and the pump (not shown, the same applies hereinafter) connected to the shaft 04) is driven. It is well known that this is the case.

Here, as the operation progresses, the stator (2) and rotor (I2)
) rises, volumetric expansion will occur in the lubricating oil and insulating oil fB). This volume expansion occurs when the insulating oil (B) is securely removed because the joints of the frame (1), can (3), upper collar (4), and upper collar (5) are joined by welding. It is sealed and prevented from leaking outside. However, since the shaft (I4) of the lubricating oil (A) passes through the upper bracket (6),
Although the shaft sealing device α is installed, leakage is about to occur. However, since the diaphragm (19) is watertightly connected to the thrust case (15), the volume 11ii11i1j of the lubricating oil is in the communication groove (111% communication 60?
), and is absorbed by the displacement of the diaphragm (19), and the pressure increase of the lubricating oil (A), that is, the pressure increase around the rotor (country) is suppressed.

By the way, when this device is used in an atmosphere of high pressure and high temperature, the inside of the lubricating oil and the insulating oil (especially the insulating oil tB where the volumetric expansion of Bl is extremely large) are in the frame (1),
Since it is completely sealed by the can (3), upper collar (4), and upper collar (5), the pressure around the stator (2) becomes high.

As a result, high pressure is applied to the can (3), which is made up of a thin plate, and the can (3) deforms into the rotor +121 example, causing the can (3) to restrain the rotor (12). , Also, the can (3) and the upper tsuba (4) or the upper tsuba (
5) has the disadvantage that it may cause serious accidents, such as damage to the joints. This invention was made to solve the above-mentioned drawbacks, and includes a communication hole provided in the end plate or frame that communicates with the periphery of the rotor or outside the frame, and a communication hole between the end plate and the frame and the can. A pressure adjusting member is coupled to the frame and has an elastic body that partitions the inside of the frame into a chamber that communicates with the communication hole and a chamber that communicates with the periphery of the stator, and insulating particles are provided around the coil end of the stator. By enclosing the insulating oil, the amount of insulating oil enclosed can be reduced, and the expansion of the insulating oil can be reduced! The purpose of the present invention is to provide a liquid ring type electric motor that can suppress electric power.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In the figure, (211 is the lower bracket (7)
One side is a communicating hole that passes through the thrust case in the axial direction.
The cylindrical part at one end of one haiku (communicates with the chamber □□□ in the cylinder).

The above-mentioned communication hole (24) has a communication hole that passes through the upper collar (5) in the axial direction and communicates with the above-mentioned communication hole (24). a mounting part (B) screwed into the mounting part (B), and an opening (H A case having a cylindrical portion (2 (to)) having a cylindrical portion (2), (311) is watertightly connected to the mounting portion in this cylindrical portion 4 and forms a chamber 2 that communicates with the communicating hole □□□. A cylindrical elastic body with one end closed (3
B) is an insulating particle enclosed around the coil end of the stator (2), and is composed of inorganic beads. Note that the case and the elastic body O1 constitute a pressure adjustment member.

In the structure configured as above, the stator (2)
When the surrounding insulating oil (Bl) expands significantly due to temperature rise, the volumetric expansion escapes into the case through the opening of the case (6). Compress the elastic body!
261, the rotor (
12), the elastic body (2) is compressed until the pressure around the stator (2) and the pressure around the rotor (1) are approximately equal. The pressure difference between the inside and outside of can (3) is almost eliminated, and the rotor of can (3) (
Deformation toward the 121 side is prevented.

Here, the elastic body @1) contracts in both the axial direction and the radial direction when compressed, and for example tries to curve in the radial direction, but since it is surrounded by the case (26), the elastic body (
The elastic body G3+1 can be moved due to the expansion and contraction of 'ill (3)
are prevented from coming into direct contact with the On the other hand, the stator (2
), the amount of insulating oil fBLO is greatly reduced, and the rise in internal pressure of the stator (2) is also suppressed. You will be able to use things. Further, since the insulating particles (g) can radiate the temperature rise at the coil end to the frame il+, it is possible to suppress the temperature rise.

FIG. 4 shows another embodiment, in which the communication hole H communicates with the outside of the frame il+, so the pressure around the stator (2) is equal to the outside of the frame 11+, and the same effect is achieved. .

As described above, the present invention provides a communication hole provided in an end plate or a frame that communicates with the surroundings of the rotor or outside the frame, and
A pressure adjustment member is provided in the frame and the can, and has an elastic body that is connected to the end plate or the frame and partitions the inside of the frame into a chamber that communicates with the communication hole, and a chamber that communicates with the surroundings of the stator. Since the insulating granules are enclosed, the amount of insulating oil enclosed can be reduced, and the volumetric expansion of the insulating oil can be reduced.In addition, the insulating granules can be used as a thermal acid delivery medium to dissipate heat to the frame, and the stator It also has the effect of suppressing temperature rise.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional device, Fig. 2 is a sectional view showing an embodiment of the present invention, Fig. 3 is a sectional view of a main part of Fig. 2, and Fig. 4 is a sectional view showing another embodiment of the invention. FIG. In the figure, (1) is the frame, (2) is the stator, (3) is the can, (4) is the upper tsuba, (5) is the upper tsuba, (6) is the upper platen), +71 is the lower bracket, ( 12) is a rotor, 0 is a case, (31) is an elastic body, and (33) is an insulating granule. Note that the same reference numerals in each figure indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 4 Figure 3 oooooooo oo 33 33 °°oooo. 30 o, o, 00 7 o OO00% 10 ()
Q. j oOooo. 2ri 29, F/A J2 2ta 2f

Claims (1)

[Claims] 111 A cylindrical frame, a stator fixed within this frame, a can disposed on the inner periphery of this stator, and a substantially watertight connection between this can and both ends of the frame and said fixing element. a pair of end plates for sealing the rotor; a pair of brackets respectively connected to the pair of end plates; and a rotor supported by the pair of brackets and disposed within the can; In a liquid-sealed electric motor in which oil is sealed and insulating oil is sealed around the stator, a communication hole provided in the end plate or the 7-ray A and communicating with the periphery of the rotor or the outside of the frame; A pressure adjusting member that is connected to the end plate or the frame within the frame and the can and has an elastic body that partitions the inside of the frame and the can into a chamber that communicates with the communication hole and a chamber that communicates with the periphery of the stator. A liquid ring type electric motor, characterized in that insulating particles are sealed around the coil end of the stator. (2) The liquid-sealed electric motor according to claim 1, wherein the insulating particles are composed of inorganic beads.