JPH0128376Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pump sealing device, and particularly to a pump sealing device that has excellent liquid tightness over a long period of time.

[Conventional technology]

Conventionally, the structure of the seal part used in the sealing device of this type of pump has been to use hardened metal for the material on the side to be pressed, and to use hard rubber, synthetic resin, sintered metal, etc. for the material on the side to be pressed. Was. Since this seal portion rotates and slides in contact while blocking fluid from the propeller side of the pump, it is essential that the sliding surfaces on the pressure contact side and the pressure contact side be mirror-finished so that they are in close contact with each other. was.

[Problem that the invention attempts to solve]

However, when such a sealing member is used for a long period of time, the sliding surface becomes worn and deformed, resulting in poor liquid tightness of the sealing portion, resulting in fluid leakage. In order to prevent such fluid leakage, it is necessary to frequently replace parts of the seal portion, which is both time-consuming and uneconomical.

The present invention was developed in view of the above problems, and aims to provide a pump sealing device that is highly economical and can maintain liquid tightness for a long period of time without replacing the sealing parts. be.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention is a pump sealing device consisting of a rotating side sealing mechanism and a stationary side sealing mechanism, in which the rotating side sealing mechanism is fitted onto the outer periphery of the rotating shaft of the pump. The sealing mechanism on the fixed side is formed by winding a hard resin sealing material and a soft cloth sealing material in layers, and the end surface thereof is in contact with the end surface of the seal ring. It comprises an annular water-stop seal body in contact with the water-stop seal body, and a lubricating means for applying lubricating oil to the annular water-stop seal body.

[Effect]

Therefore, when the lubricating oil is injected into the annular water-stop sealing body by the lubricating means, the lubricating oil is impregnated into the minute gaps of the sealing material wound in layers, leaches from the end face of the annular water-stopping seal body, and the lubricating oil is applied to the annular water-stop sealing body. Since the end face is constantly lubricated, the friction coefficient of the contact face with the rotating side seal ring is reduced, and there is almost no wear on the annular water-stop seal body.
Fluid leakage can be prevented for a long period of time. In addition, the fine gaps in the sealing material perform a sweeping action as the rotary shaft rotates, causing the fluid to flow toward the center of the shaft, making it difficult for leakage to occur from the contact surface.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The drawings are all related to the present invention; FIG. 1 is a longitudinal cross-sectional view of the sealing device according to the present invention, and FIG. 2 is a cross-sectional view taken along line A--A in FIG. 1.

As shown in FIG. 1, the pump sealing device according to the present invention is composed of a rotating side sealing mechanism 1 and a stationary side sealing mechanism 2. The sealing mechanism 1 on the rotating side includes a cone ring 5 fixed to the outer periphery of the rotating shaft 3 of the pump with bolts 4, etc., and the cone ring 5.
A seal ring 6 is fixed to the end face of the cone ring 5, and an O-ring 5' is fitted between the cone ring 5 and the rotating shaft 3. In this embodiment, the seal ring 6 includes a ceramic ring 6a whose end face is finished smoothly;
It consists of a rubber case 6b that accommodates a rubber case 6b, which are stacked in two tiers, with the second tier serving as a liner or a spare.

On the other hand, the seal mechanism 2 on the stationary side includes a stationary ring having a grooved flange 9a fitted via an O-ring 8 to a casing 7 at one end of the rotating shaft that accommodates a propeller (not shown), and a stationary ring 9. Lid ring 1 having grooved flanges 10a spaced apart
0, a wrapping trunk 10b formed by cutting out the entire circumference near one end of the side surface of the lid ring 10, and the wrapping trunk 1.
An annular water stop seal body 11 wrapped around 0b and a tightening band 12 that tightens the annular water stop seal body 11
and a bellows 13 whose base ends are fitted onto the grooved flanges 9a, 10a. The fixed ring 9, lid ring 10, bellows 13, etc. are arranged coaxially with the rotating shaft 3, and the gap between these and the side surface of the rotating shaft is filled with fluid W communicating with the propeller side. Thus, the bellows 13 expands under water pressure due to the fluid W.
The lid body 10 is urged toward the seal ring 6 side. In the figure, reference numeral 14 denotes an oil supply passage for injecting vertical oil into the annular water-stop sealing body 11, and the opening of the oil supply passage 14 is connected to an oil supply means (not shown). Next, the end surface of the wrapping layer of the annular water-stop sealing body 11 is provided to slightly protrude from one end of the lid ring 10, and the end surface of the wrapping layer is biased by the bellows 13 to form the seal ring 6.
The ceramic ring 6a is pressed against the end face of the ceramic ring 6a.
Therefore, the sealing mechanism 1 on the rotating side and the sealing mechanism 2 on the stationary side collide with each other at this portion, thereby blocking water. In addition, in this embodiment, the water-stop seal body 1
1 to the seal ring 6 side, a bellows 13 that uses water pressure is used, but the mechanism is not limited to this, and for example, a spring, etc. Any material may be used as long as it can be energized.

Next, in FIG. 2, to explain the annular water-stop sealing body 11 in the form of a rolled layer, the water-stopping seal body 11
is a relatively hard material with a small coefficient of friction, for example, a sealing material 11a such as tetrafluoroethylene resin.
is wide and formed into a ribbon shape to form the lid body 10.
The winding body 10b is wound in a direction opposite to the direction of rotation of the rotary shaft 3. The resin sealing material 11a wound around this wrapped body has a winding start end Y and a winding end Z, but these are tightly bound by the tightening band 12 installed on the outer periphery in the radial direction. can be closely configured with each other.

The resin sealing material 11a thus wound in multiple layers
A fine gap S formed between the end layers in the width direction performs a sweeping action or a kind of pumping action as the rotating shaft 3 rotates, thereby constantly fluidizing the fluid W toward the center of the rotating shaft 3. Further, even if the resin sealing material 11a is abraded due to contact with the seal ring 6 and may be slightly deformed, the fluid W is swept away by the rotating shaft 3 due to the sweeping action.
Since the sealing material 11a can move toward the center of the sealing material 11a, no fluid leakage occurs from the deformed portion of the sealing material 11a.

Furthermore, when the lubricating oil is forcibly injected into the resin sealing material 11a from the oiling passage 14, the lubricating oil impregnates the minute gaps S formed in the resinous sealing material 11a and is intermittently injected, or by gravity. Therefore, a capillary phenomenon occurs, and the leakage occurs between the seal ring 6 and the end face of the ceramic ring 6a. Therefore, since the rotating contact surface is lubricated, the lubrication effect of the seal portion is improved, the coefficient of friction is reduced, and the resin seal material 11a
Almost no wear occurs. Furthermore, since a strong pressure can be applied, the sealing effect is high and fluid leakage can be reliably prevented.

By the way, as shown in FIG. 3, the annular water-stop sealing body 11 is made of, for example, felt, hemp, silk, cotton, Alternatively, a relatively soft cloth sealing material 11b made of nylon or the like is sandwiched and wrapped. Therefore, since the fabric sealing material 11b is impregnated with a large amount of lubricating oil, the lubricating oil can be sufficiently supplied to the rotating contact surface, and wear of the seal can be further reduced.

In addition, the cloth sealing material 11b protruding from the end surface adheres well to the seal ring 6 at the initial stage of winding and performs a sufficient water sealing function, and after operation, the protruding portion gradually wears away and becomes a hard resin seal. Since the end faces of the material 11a are aligned and come into sliding contact with the seal ring 6, the water sealing effect will be great even if both sliding surfaces are not specially processed to a mirror finish. Even if the end face of the annular seal ring 6 is somewhat rough, the annular water-stopping seal body 11 can be well adapted to the seal ring 6, and an excellent water-sealing effect can be achieved.

By the way, each of the multilayer sealing materials 11a, 11
The thickness of b and the number of times of winding can be changed as appropriate depending on the size of the pump used, the number of rotations of the rotary shaft, etc.

Next, the seal ring 6 that collides with the annular water-stop seal body 11 is attached to the rubber case 6b with the ceramic ring 6.
Since the rubber case 6a is fitted in the rubber case 6a, when these parts become worn, the rubber case 6b can be easily removed by cutting the rubber case 6b with a knife or the like and splitting the ceramic ring 6a. In this way, after the first stage seal ring 6 is discarded, the second stage can be newly used. In this embodiment, the seal ring 6 is configured as described above, but the seal ring 6 is not limited thereto, and for example, a known hardened metal ring or the like may be used.

In this embodiment, the sealing mechanism 1 on the rotating side includes a sealing ring 6 made of a ceramic ring 6a or the like.
Although the annular water-stop sealing body 11 in the form of a rolled layer is used as the sealing mechanism on the stationary side in the above, it may be replaced and used, and in this case, the same effect as described above is obtained.

Furthermore, it goes without saying that the sealing device according to the present invention can be used not only for pumps, but also for locations requiring water sealing properties.

[Effect of idea]

Since the present invention is configured as described above, it has the following excellent effects.

(a) The sealing mechanism on the fixed side is composed of an annular water-stop sealing body in which ribbon-shaped resin sealing material and cloth sealing material are alternately wound in layers around the wrapping body of the lid ring. When oil is injected, the lubricating oil impregnates the minute gaps between the sealing materials and constantly lubricates the end surfaces of the sealing materials, reducing the coefficient of friction with the rotating seal ring and reducing wear of the sealing materials. Almost never occurs and prevents leakage for a long time.
It is possible to maintain fluid tightness.

(b) Since each of the sealing materials is wound in the direction of rotation opposite to that of the rotating shaft, the minute gaps between the wound layers act as a sweeping action as the rotating shaft rotates, and the fluid is constantly directed toward the center of the shaft. Seshime,
Together with the lubricating action of the lubricating oil, fluid leakage can be reliably prevented.

(c) The end face of the annular water-stopping seal body has a great water-sealing effect even without the complicated process of finishing it to a mirror finish like conventional seal members, so there is no need for mirror finishing, and it has a long service life. Therefore, the cost of components and the cost required for maintenance can be significantly reduced.

(d) The sealing mechanism on the fixed side uses a mechanism that winds the sealing material in layers, so there is no need to remove the rotating shaft when replacing the sealing material. The sealing material can be easily replaced in a short time. In addition, the sealing mechanism on the rotating side consists of a ceramic ring fitted into a rubber case, so if these wear out, they can be easily removed by cutting the rubber case with a knife, etc., and splitting the ceramic ring inside. be able to.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the sealing device according to the present invention.
FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a sectional view showing a resin sealing material and a cloth sealing material overlapped and wound around the wrapping body of the lid ring. DESCRIPTION OF SYMBOLS 1... Rotating side seal mechanism, 2... Fixed side seal mechanism, 3... Rotating shaft, 6... Seal ring, 9... Fixed ring, 10... Lid ring, 11... Annular water stop seal body, 11a ...Resin sealing material, 11
b...Fabric sealing material, 12...Tightening band, 13
...Bellows, 14...Lubrication path, W...Fluid, S
...Minute gaps.

Claims (1)

[Scope of utility model registration request] In a pump sealing device comprising a rotating-side sealing mechanism and a stationary-side sealing mechanism, the rotating-side sealing mechanism includes a seal ring with a mirror-finished end surface fitted to the outer periphery of a rotating shaft of the pump, The sealing mechanism on the fixed side includes an annular water-stop sealing body formed by winding a hard resin sealing material and a soft cloth sealing material in layers, the end surface of which abuts against the end surface of the seal ring; 1. A pump sealing device comprising: an oil supply path for supplying lubricating oil to a water seal body.