JP3127076B2 - Outside type mechanical seal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outside mechanical seal device in which a mechanical seal body is disposed on the atmosphere side to prevent leakage of a shaft sealing portion of a rotary shaft.

[0002]

2. Description of the Related Art Conventionally, mechanical seals (mechanical seals) have been used.
eal) devices, there are two types, an inside mechanical sheet in which the mechanical seal body is disposed on the fluid side such as liquid or gas, and an outside type mechanical sheet in which the mechanical seal body is disposed on the atmosphere side. In the inside type mechanical seal described above, there is a type in which the entirety is integrated as a unit. On the other hand, in the outside type mechanical seal device, there is no type in which the entirety is integrated.

For this reason, in a conventional outside type mechanical seal, a mechanical seal composed of multiple parts such as a flange, a seat ring, a rotating ring, a stopper ring, a spring, an O-ring, and the like is provided with a rotating shaft and a fixed side (for example, pump stuffing). The mounting work between the box and the box) requires skill, and there is a problem in that the mounting property is poor.

[0004]

SUMMARY OF THE INVENTION According to the first aspect of the present invention, a stopper ring provided on a rotary shaft can be reliably positioned in a radial direction and a thrust direction with respect to a shaft center of a rotary shaft. It is an object of the present invention to provide an outside-type mechanical seal device that can achieve an integral unit of the entire mechanical seal made of and can facilitate assembly.

In addition to the object of the first aspect of the present invention, the invention according to a second aspect of the present invention provides a structure in which a stopper ring disposed on a rotation axis is arranged in a radial direction and a thrust direction with respect to a rotation axis. It is an object of the present invention to provide an outside-type mechanical seal device that can achieve more reliable positioning.

[0006]

According to a first aspect of the present invention, there is provided an annular stopper ring fixed on a rotating shaft with a set bolt, an annular flange bolted up to a fixed side, and the flange. A plurality of protruding pieces integrally formed at a position opposed to the outer peripheral surface of the stopper ring at a predetermined interval with respect to the outer peripheral face, and a plurality of protruding pieces formed between the inner surface of each of the protruding pieces and the outer peripheral surface of the stopper ring. And a cap bolt that penetrates through the protrusion and the spacer from the outside of the protrusion and is removably screwed to the stopper ring .
It is an outside type mechanical seal device for removing a pacer and a cap bolt .

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the projecting piece, the spacer and the cap bolt are positioned at equiangular positions about the axis of the rotary shaft. A plurality of outside-type mechanical seal devices are provided.

[0008]

According to the first aspect of the present invention, the thickness of the plurality of spacers interposed between the inner surface of each of the protruding pieces and the outer peripheral surface of the stopper ring causes the thickness of the rotating shaft to be reduced. The stopper ring provided is positioned in the radial direction (radial direction) with respect to the axis of the rotating shaft, and the cap bolt described above penetrates the protruding piece and the spacer and is screwed into the stopper ring. Positioning in the thrust direction (axial direction) with respect to the rotation axis of the ring is performed.

In this way, since the positioning of the above-mentioned stopper ring in both the radial direction and the thrust direction can be reliably performed, it is possible to achieve an integral unit of the whole mechanical seal composed of multiple parts. Can be. Therefore, when assembling the mechanical seal, the integral unit may be assembled between the rotating shaft and the fixed side, so that the assemblability can be facilitated. There is an effect that does not require.

According to the second aspect of the present invention,
In addition to the effects of the first aspect of the present invention,
Since the spacer and the cap bolt are provided at an equiangular position with respect to the center of the axis of the rotating shaft, particularly in the radial direction due to the thickness of the spacer described above, the stopper ring can be uniformly positioned from the equiangular position of the outer periphery of the stopper ring. As a result, it is possible to achieve more reliable positioning, particularly in the radial direction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. The drawing shows an outside-type mechanical seal device. First, referring to FIG. 1, a description will be given of a state of use of the outside-type mechanical seal device. Referring to FIG. 1, a rotary shaft 3 having an impeller 1 at one end and a shaft coupling 2 at the other end is shown. So-called main shaft)
, The impeller 1 is surrounded by a pump casing 4, and a bearing box 6 is disposed at two intermediate positions of the rotating shaft 3 via bearings 5, 5. A pump 8 is formed by attaching a bearing cover 7 to an end face of the pump 8.

The above-mentioned outside type mechanical seal device 9 is used for sealing the shaft between the rotating shaft 3 as a rotating element and the stuffing box 10 of the pump casing 4 as a fixed element. . In addition,
In FIG. 1, LI indicates the liquid side, and AI indicates the atmosphere side.

FIGS. 2 and 3 show a specific configuration of the outside type mechanical seal device 9, in which an annular first flange 11 made of a metal such as stainless steel and an annular second flange 12 also made of a metal such as stainless steel. Are integrated by four stainless steel connecting bolts 13 in total, and a total of four concave grooves 14 are integrally formed in the outer peripheral portions of the flanges 11 and 12 as shown in FIG. First
A sheet packing 15 is disposed on a surface of the flange 11 on the stuffing box 10 side.

An annular seat ring 16 made of a metal such as tungsten is provided on the inner diameter of the first flange 11.
And an O formed on the outer periphery of the seat ring 16.
An O-ring 17 for sealing between the elements 11 and 16 is provided in the ring groove. A groove 18 is cut out at four places on the outer periphery of the seat ring 16, and the groove 18 is formed.
The stainless steel knock pin 19 on the first flange side is inserted into the first flange.

On the other hand, on the inner diameter side of the above-mentioned second flange 12, an annular stainless steel bolt fixed to the above-mentioned rotary shaft 3 by a stainless steel set bolt 20 (so-called set enamel, see FIG. 5) when the assembly is completed. Stopper ring 2
1 is arranged. An O-ring 22 for sealing between the elements 3 and 21 is provided in an O-ring groove formed in the inner diameter portion of the stopper ring 21. For example, four O-rings are provided on the end surface of the stopper ring 21 on the seat ring 16 side. And an annular rotating ring 24 made of a metal material such as SIC is provided between the stopper ring 21 and the seat ring 16 so as to be fitted to each of the knock pins 23. The sliding surface (rotating shaft 3) is provided between the rotating surface at one end (left end in FIG. 2) of the rotating ring 24 and the fixed surface at the other end (right end in FIG. 2) of the seat ring 16. (Seal surface perpendicular to the end face) S.

On the first flange 11 side, for example, a total of eight stainless steel springs 25 are attached to press the fixing surface of the seat ring 16 against the rotating surface of the rotating ring 24. In the figure, reference numeral 26 denotes a quenching inlet for injecting a cooling liquid, a cleaning liquid, etc.
The ring 28 is a resin ring such as a tetrafluoroethylene resin.

A plurality of protruding pieces 29 are integrally formed on the second flange 12 so as to face the outer peripheral surface of the stopper ring 21 at a predetermined interval. A spacer 30 of a predetermined thickness made of a synthetic resin such as polypropylene is interposed between the inner surface of each protruding piece 29 and the outer peripheral surface of the above-described stopper ring 21, and further formed on the above-mentioned stopper ring 21. A stainless steel cap bolt 32 penetrating through the projecting piece 29 and the spacer 30 is detachably screwed into the screw holes 31.

Here, the protruding piece 29, the spacer 30,
As shown in FIG. 3, the cap bolt 32 has an arrangement angle θ1 between the elements 29, 30, and 32 located on the left side, and an arrangement angle θ between the elements 29, 30, and 32 located on the right side.
2 is set to be mutually equiangular (θ1 = θ2) with respect to the center P of the axis of the rotation shaft 3 described above. In this embodiment, a total of four sets of the elements 29, 30, and 32 are arranged by setting the above angle to θ1 = θ2, but are divided into three equal parts on the circumference, four equal parts on the circumference, or more. These elements 29, 30, and 32 may be arranged at equal intervals, that is, at equal angular positions. In the figure, reference numeral 33 denotes an O-ring for sealing between the components 21 and 12, and reference numeral 34 denotes a screw hole formed in the stopper ring 21 for screwing the set bolt 20.

As described above, due to the thickness of the plurality of spacers 30 interposed between the inner surface of each protruding piece 29 and the outer peripheral surface of the stopper ring 21, the stopper ring provided on the rotating shaft 3 21 is positioned in the radial direction (the direction of the arrow a in FIG. 2) with respect to the axis of the rotating shaft 3, and the above-described cap bolt 32 is
And is screwed into the stopper ring 21 described above, so that even if the spring force of the spring 25 acts in the direction of arrow f in FIG. Positioning in the direction of the arrow b in FIG. 2 is performed. Positioning in the radial and thrust directions is reliably performed in a state before assembly shown in FIG.

As described above, the positioning of the stopper ring 21 in both the radial direction and the thrust direction can be reliably performed. Therefore, as shown in FIG. 4, a mechanical component composed of multiple parts (see each element 11 to 34) is provided. The entire sealing device 9 can be integrated.

Therefore, when assembling the mechanical seal device 9 described above, the mechanical seal device 9 is integrated (FIG. 4).
Can be assembled between the rotating shaft 3 and the stuffing box 10 of the pump 8 as a fixed side, as described below, so that the assemblability can be facilitated. There is an effect that does not require.

That is, the above-described mechanical seal device 9
In order to assemble, first, the mechanical seal device 9 (see FIG. 4) integrated into a unit is inserted into the rotating shaft 3, and then the stuffing box 10 of the pump casing 4 is assembled. In this state, the flange bolt is tightened from the atmosphere side AI to a screw hole (not shown) of the stuffing box 10 by using a flange bolt (not shown) using a flange bolt (not shown). The sealing device 9 is bolted up to the stuffing box 10.

Next, a plurality of set bolts 20 (specifically, so-called set hollows which are hexagon socket head bolts) are screwed into the screw holes 34, and the stopper ring 21 is fixed to the rotating shaft 3.

Next, after removing the cap bolt 32 described above, the spacer 30 is removed, and the assembly is completed.
When the assembly is completed, the state shown in FIG. 5 is obtained.

The shaft sealing action after the completion of the assembly is as follows. That is, the rotating ring 24 and the stopper ring 21 follow the rotating shaft 3 with the respective elements 20, 22, 23, 27, 28, while the flanges 11, 12, the seat ring 16 and the like have a fixed structure. 2
5 seals the leakage of the liquid LI to the atmosphere side AI on the sliding surface (sealed end surface) S between the seat ring 16 pressed against the fixing ring 24 and the rotating ring 24.

In the correspondence between the configuration of the present invention and the above-described embodiment, the flange of the present invention corresponds to the second flange 12 of the embodiment, but the present invention is limited to only the configuration of the above-described embodiment. Not something.

For example, in the above-mentioned embodiment, the shaft is sealed between the liquid side LI and the atmosphere side AI. However, the shaft is sealed between another fluid such as gas and the atmosphere side AI. The material of each element disclosed in the above embodiment is an example, and is not limited to this. Further, the first flange 11 and the second flange 12 shown in the above embodiment are provided.
May of course be a single structure.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a pump device showing one mode of use of an outside type mechanical seal device of the present invention.

FIG. 2 is a cross-sectional view of the outside type mechanical seal device of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a cross-sectional view of the outside type mechanical seal device integrated into a unit before assembly.

FIG. 5 is a cross-sectional view of the outside type mechanical seal device when assembly is completed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 ... Rotary shaft 9 ... Outside type mechanical seal device 12 ... 2nd flange 21 ... Set bolt 21 ... Stopper ring 29 ... Protrusion piece 30 ... Spacer 32 ... Cap bolt

Claims (2)

(57) [Claims] An annular stopper ring fixed on a rotating shaft with a set bolt; an annular flange bolted up to a fixed side; and a flange opposed to an outer peripheral surface of the stopper ring on the flange. A plurality of protruding pieces integrally formed at predetermined intervals with respect to each other; a spacer interposed between an inner surface of each of the protruding pieces and an outer peripheral surface of the stopper ring; And a cap bolt penetrating the spacer and detachably screwed to the stopper ring. After assembling the device, the spacer and the cap bolt are provided .
Outside type mechanical seal device that removes 2. The outside type mechanical seal device according to claim 1, wherein a plurality of said projecting pieces, spacers and cap bolts are provided at equiangular positions around an axis of said rotary shaft.