JPS6023674A - Multistage shaft seal bearing device - Google Patents

Abstract

PURPOSE:To perform assembly in a short time by inserting a stationary cylinder between a cylindrical elastic body supported in the hole of a bearing box and the outer surface of a rotary cylinder fixed on the other periphery of a rotary shaft. CONSTITUTION:A stationary cylinder 24 is provided on the outside of a rotary cylinder 15, and an annular groove 26 and an annular lug 27 to be closely engaged with an annular lug 22 and an annular groove 23 respectively on the outside of the rotary cylinder 15 are formed on the inner periphery of the stationary cylinder 24. Grease is stuffed between the annular lugs 22, 27 and the bottom of the annular grooves 26, 23 to be engaged together. During the assembly, the annular lug 27 of the stationary cylinder 24 is coupled with the annular groove 23, and they are inserted into the hole 13 of a bearing box 12 fitted with a cylindrical elastic body 32 and a push cover 35 in advance, then the push cover 35 is screwed in.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-stage shaft-sealing bearing device that has both a fluid leak prevention function and a bearing function.

In the conventional "shaft 4" device, the opposing end surface of a rotating ring fixed to the rotating shaft is pressed against the end surface of the bearing part in the direction iσ intersecting with the shaft tension by a spring on a rotating pin that exerts a force in the M direction. This sliding contact part prevents the fluid from draining.

In this type of shaft sealing device, the suppressing force of the spring is reduced due to centrifugal force fluctuations caused by changes in rotation speed from startup to gradually high speed rotation, and changes in rotation speed from high speed rotation to stop. For example, when a slurry liquid is used, particles contained in the slurry liquid enter the sliding contact area. Once the particles enter the sliding contact area, they do not leave the sliding contact area, so that the lapping surface of the sliding contact surface becomes rough and liquid leakage occurs.

This is considered to be unavoidable due to the structure of the conventional shaft sealing device. That is, when starting or stopping, when rotating at high speed, and σ
), is the rotational axis eccentric or grinding motion? The rotating ring fixed to the rotating shaft also undergoes a wave-like undulating motion due to the rotational movement and back motion in the axial direction, and as a result, gaps that fluctuate over time are likely to occur in the sliding contact area. Therefore, the formation of an oil film on the sliding contact surface, which is effective for long-term shaft sealing, cannot be expected to be very effective against slurry liquids and the like.

On the other hand, new devices (conventional) use many parts that can cause failures, such as springs, push screws, and screws, and require special skills to select the setting position. f
Another drawback is that the 111 attachment cannot be carried out in a short period of time.

It is an object of the present invention to obtain a multi-stage one-seal bearing device that does not have the above-mentioned drawbacks and also has a one-seal mechanism in addition to the shaft sealing function. purpose.

The multi-stage shaft-sealed bearing device according to the present invention includes a hole formed through a bearing box, a rotating shaft passing through the hole, a cylindrical shaft supported on the inner surface of the hole of the bearing box, and a rotary shaft passing through the hole. It has a rotating cylinder fixed to the outer peripheral surface, and a fixed cylinder interposed between the outer surface of the rotating fj and the cylindrical elastic phase, and this fixed cylinder has a trapezoidal cross section extending outward on the inner peripheral surface. The annular structure and annular protrusion are mutually related.
Furthermore, the rotary cylinder has an annular protrusion and an annular groove on its outer circumferential surface that closely and rotatably engage with the annular protrusion and annular protrusion of the fixed cylinder, and the door-like protrusion of the rotary cylinder and the fixed cylinder. The part has a height such that a gap for sealing the grease is formed between the bottom of the annular groove and the bottom of the annular groove. It is characterized by

The present invention will be described in detail below with reference to one drawing.

In Fig. 1, reference numeral 1 is the output shaft of a motor (not shown), and a chi-zo bush 2 is fitted on the outer periphery of its tip. It is inserted into hole 4. A hole 5 is provided at the other end of the hub 3, and a female thread 5a is formed in the hole 5.

Both holes 4 and 5 communicate with each other through a hole 6, and the bolt 7 inserted from the hole 5 side through the hole 6 and into the hole 4 side is screwed into the output shaft 1, whereby the output shaft 1 and the hub 3 are connected. It is integrated.

A male thread 8a at the end of the rotary shaft 8 is screwed into the hole 5 of the hub 3, so that the hub 3 and the rotary shaft 8 rotate together. In order to integrally rotate the knob 3 and the rotating shaft 8, a gear (not shown) is interposed between the two. Reference numeral 9 denotes a finger held between the flange 10 of the rotary shaft 8 and the knob 3, and when this finger rotates, it splashes the droplets so that they do not reach the motor below.

The rotating shaft 8 is installed through the bearing box 12 and passed through seven holes 13. The bearing box 12 is, for example, a pump +41':l
It is a part of the casing, such as a stirring root, and its peripheral portion is appropriately connected to the main body of the casing (not shown). In FIG. 1, the upper side of the bearing box 12 is the inside of the casing, the lower side is the outside of the casing, and the bearing box 12 is
A multi-stage shaft seal and a receiving device, which constitute the four parts of the present invention, are provided inside the shaft.

Rotating cylinders 15 are fitted into the outer periphery of the rotating shaft 8. The rotating cylinder 15 is made of, for example, cemented carbide.

A small diameter part 17 is protruded on the opposite bank of the rotating shaft 8, and a screw J8 is provided thereon. It is fixed by a nut 12 screwed together. By tightening the nut 21, the base 19 +
5 and the flange 10, and the rotating part 18 is integrated. [-Therefore, the 15th rotating cylinder can rotate together with the rotating shaft 8.

As shown in FIG. 3, annular protrusions 22 and Ei-shaped grooves are alternately formed on the outer peripheral surface of the rotary cylinder 15.

The annular protrusion η has a trapezoidal cross section, and the annular groove also has a trapezoidal cross section that expands outward accordingly, and both side walls of the annular groove have one side of inclination.

The angles α that both open slopes make with respect to the center plane of the annular groove B are equal, for example, about 30° to 35°. It is preferable that all the annular protrusions 22 and annular grooves have the same shape and dimensions, but they may have different dimensions.

A fixed cylinder 24 is provided outside the rotating cylinder 15. The fixed cylinder 24 is made of, for example, metal impregnated with sintered metal grains, and is divided into a plurality of parts by hard splitting as shown in FIG. 2, and further includes a plurality of ring bodies 24a, 2 in the axial direction.
It is divided into 4b, 24c, 24d, and 24e. On the other hand, the fixed cylinder U is divided into rings 1 and C.
<But it's okay. When the identification cylinder 24 is divided into rings,
The ring body in contact with the liquid in the casing and the ring body adjacent thereto may be constructed of a ring body made of a material suitable for the purpose.

On the inner peripheral surface of the fixed cylinder 24, an annular step and an annular protrusion 27 are formed in the shape 5'i, which closely engage with the annular projection 22 and the annular groove n on the outer side of the rotating cylinder 15. . In the illustrated embodiment, one annular projection 27 is provided on each of the annular bodies 24a to 2'4e.

The annular projection 22 of the rotating cylinder 15 and the annular projection 27 of the fixed cylinder 24 have a height such that a gap 29 of, for example, about 2 mm is formed between the annular groove 26 with which they engage and the bottom of z3. ing. These gaps 29 are annular as shown in FIG. 2, and are filled with grease.

As shown in FIG. 1, an annular recess 31 is provided in the hole I3 of the bearing box 12, and a cylindrical elastic body 32 is mounted within the recess 31. As shown in FIG. The cylindrical elastic body is made of, for example, IJ rubber. As shown in FIG. 3, the cylindrical elastic body 32 is constructed by laminating a female adapter 32a, a V-shaped cross section of W number, an e-tight skin 32b, and a male adapter 32G.

A smaller annular recess 3 is provided on the outside of the annular recess 3I.
4 is provided, and a push lid 35 is provided inside this. The push lid 35 has threads 35a to 35f, as shown in FIG. 3, and the male threads 35a are screwed into the female threads of the annular recesses 3 and 4. By screwing the lid 350 times, the cylindrical elastic body 32 is compressed by the inner flange 3G of the press 35 in the 1-center direction, and the inner fixed cylinder 2111 is pushed down inward to tightly fit into the rotating cylinder 15. bring into contact.

When assembling, the rotating cylinder J fitted into the rotating shaft 8
After filling the annular groove n of No. 5 with grease, the annular recess 27 of the fixed barrel is fitted into the annular groove η.

Then, in advance, the cylindrical elastic body 32 and the push lid 3 are
Insert 1-1 into the hole 13 of the bearing box 12 in which the bearing box 5 is attached. As a result, the cylindrical elastic body 32 is compressed in the longitudinal direction and tends to deform inward in the radial direction, pushing the fixed cylinder 24 against the rotating cylinder J5.

Closely fit the annular grooves and the current protrusions on both sides to confine the grease within the gap 29. Rotating cylinder I5 and 1・■ Leg part 2
It is recommended that the slopes of the annular groove and annular protrusion in 4 be finished by lapping to an accuracy of, for example, 0.01 mm.
As a result, the annular groove and the slope of the annular projection i4S come into close contact,
The grease is held within the gap 29 and receives (Jq) supply of grease therefrom.

Further, the cylindrical elastic body 32 is kept in a fixed state by elastically (strongly abutting) the fixed cylinder 24, while the rotating cylinder 15 rotates as the shaft 8 rotates.

At this time, the slope of the annular groove of the fixed cylinder 24 marks the annular protrusion of the rotating cylinder 15 at the support I-axis bearing 1-. Grease is constantly supplied to the space between the annular groove and the slope of the annular protrusion to maintain an oil film on the sliding surface for a long period of time. Note that the pressing force acting on the sliding surface can be adjusted as desired by adjusting the pusher cover 35.

As mentioned above, the sliding surfaces are always in close contact and the oil film is maintained, which provides an excellent shaft sealing effect and prevents the fluid inside the casing from leaking out of the casing. Existence of the cylindrical elastic body 32 outside the fixed cylinder 24 FE
[Thus, the radial beating inside the fixed cylinder 1. You can also get the effect of absorbing all the thrust motion, stationary movement, etc. Furthermore, even if a minute 1111 shaft eccentricity occurs at the joint between the bearing box 12 and the casing,
Jl is allowed due to the deformation of the cylindrical elastic body 32.

Furthermore, even if the shaft rotational speed changes at the time of starting or stopping, the engagement of the plurality of annular grooves and the annular protrusion allows (i.
It is clear that there is no negative influence of J et al., and it is also clear that disassembly and assembly are easy.

As can be seen from the above examples,
According to the present invention, for example, there are no parts that are prone to failure, and assembly and disassembly can be performed easily and quickly, which contributes to labor saving, and has excellent long-term shaft sealing function. This results in an old single-stage bearing device that can also absorb

[Brief explanation of the drawing]

FIG. 1 is an axial sectional view showing a multi-stage sealing bearing device 7 of the present invention, FIG. 2 is a sectional view taken along the JT-II line in FIG.
The figure is an enlarged sectional view of part of the abduction shown in Figure 1. +ru. 1...Motor output shaft, 3...Hub, total rotation M. 12...4 gun 1 (receiving box, 13...hole, 15...rotating tube, 19...impeller base, 22...annular protrusion,
23... Annular groove, 27I... Fixed cylinder. 24a-24. e... cyclic body, 2G... cyclic' (pT,
27...Laminar projection. 29... Gap, 32... Cylindrical elastic body, 32a,
32C...adapter, 32+)...ξtsugin, 3
5...Press 1. ¥,. Applicant I (Publisher Kiyoshi Inomata)

Claims (1)

[Scope of Claims] l A hole penetrated through the bearing box, a rotation shaft passing through the hole,
A cylindrical elastic member supported on the inner surface of the hole of the bearing box, a rotating cylinder fixed to the outer peripheral surface of the rotating shaft, and a fixed cylinder interposed between the outer surface of the rotating cylinder σ) and the cylindrical elastic member. and this j
The controlling tube is on the inner circumferential surface. The rotary tube is provided with annular grooves and annular protrusions with a trapezoidal cross section that expand outward alternately, and the rotary cylinder is provided with an annular groove 6 and an annular protrusion of the fixed cylinder on its outer circumferential surface densely and with a rotating 4I'W automatic M. : A gap for grease sealing is formed between the annular protrusion and the annular groove (4i+E, the annular protrusion of the rotating cylinder and the fixed cylinder are engaged with the bottom of the annular groove and σ) respectively. A multi-stage 2-type IIl + stub 1 receiving device characterized in that the cylindrical elastic member has a height such that the upper circumference of the fixed cylinder is supported by a cylindrical elastic member.2. By stacking the bullet bodies, a multi-stage, thorn-sealed bearing device of Hiiragi-sunadeiro patent scope u, 1 ko 8υ-shio is created. 3. The fixed cylinder is divided into several pieces. 4. The fixed cylinder is formed by stacking several ring bodies.
m1 of the patent claim that is l! , multi-stage 11'i bearing device. 5. The bearing box is provided with a cylindrical elastic body that exerts a compressive force in the transverse direction and a cover that presses the fixed cylinder toward the rotating cylinder. [7] Claim No. 1 J6 ji: A multi-stage shaft seal bearing device.