JPH1182753A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device which properly seals a first surface to be sealed of a cylindrical face shape and a second surface to be sealed of a planar shape which is orthogonally crossed with the shaft line and performs relative movements. SOLUTION: A seal ring member 6 is constituted by arranging first and second seal rings 61 , 62 , which are separated at least one portion in the peripheral direction in parallel to a shaft line direction in a state that the separating portions go wrong with each other in the peripheral direction. The inner peripheral surfaces 6a, 6b of each seal ring 61 , 62 are pressed on and brought into contact with a first surface 3d to be sealed of a cylindrical face shape via a holding ring member 7 of a division structure which is tightly bound by a garter spring 8. Both end faces 6c, 6d of the first seal ring 61 are pressed on and brought into contact with a second surface to be sealed 4b of a planar shape and the end face 6e of the second seal ring 62 by energizing force of a coil spring 9a pressing the holding ring member 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple sealing device used for a shaft sealing portion of a fluid machine or a pneumatic machine or a secondary seal portion of a mechanical seal provided in the shaft sealing portion. More particularly, the present invention relates to a sealing device for sealing between a first cylindrical surface to be sealed and a second planar surface to be relatively moved perpendicular to the axis thereof.

[0002]

2. Description of the Related Art In a shaft seal portion of a fluid machine or a pneumatic machine or a secondary seal portion of a mechanical seal provided in such a shaft seal portion, a cylindrical or cylindrical first sealed member is fitted or fitted. The relative movement of the two sealed members (the first movement) between the second sealed member having the circular hole or the circular concave portion to be engaged.
The relative movement of the sealed member in the axial or radial direction)
In some cases, it is necessary to make the seal in a state in which is allowed. For example, in a mechanical seal composed of a rotary seal ring on the rotating shaft side and a stationary seal ring on the seal case side, a first sealed member formed of a stationary seal ring as a second sealed member on the seal case. In some cases, the cylindrical wall portion, which is a member, is fitted and held movably in the axial direction. In such a case, the followability between the stationary sealing ring and the cylindrical wall portion to the rotating sealing ring is ensured. In order to allow the stationary seal ring to be displaced in the axial direction as much as possible, it is necessary to perform sealing (secondary seal).

[0003] As a sealing device between the first and second sealed members that move relative to each other, generally, as a sealed surface, opposing surfaces of both sealed members (the outer periphery of the first sealed member). Surface and a hole of the second member to be sealed and an inner peripheral surface of the concave portion with which the member is fitted and engaged, and a ring-shaped seal made of an elastomer material (hereinafter referred to as "elastomer seal") is provided between the surfaces to be sealed. Loaded ones are well known.
For example, in the mechanical seal described above, a rubber O-ring as an elastomer seal is loaded between the inner peripheral surface of the stationary sealing ring and the outer peripheral surface of the cylindrical wall portion, and the stationary sealing ring, the seal case, The space between them is secondary sealed.

According to the sealing device using such an elastomer seal, the elastomer seal follows the displacement of the first or second sealed member by its own elasticity (entropic elasticity), so that the two sealed members are sealed. Can be satisfactorily sealed between the two sealed members while allowing the relative movement of the members.

[0005]

However, such a sealing device has an advantage that the structure can be simply and easily sealed, but on the other hand, the sealing conditions that can be applied are extremely limited due to the properties of the elastomer seal. There's a problem. For example, an elastomer material such as rubber is inferior in heat resistance and is not suitable for sealing under high temperature conditions. Also, since the elasticity of the elastomer seal itself ensures the followability to the displacement of the surface to be sealed, the expansion of the elastomer seal hinders the movement of the seal ring in a high-temperature atmosphere in which the elastomer material is significantly expanded. The ability to follow the displacement of the sealing surface is not sufficiently exhibited, and the heat generated by the contact of the sealing surface breaks the elastomer seal, making it impossible to perform proper sealing.

According to the present invention, as the surface to be sealed of the second member to be sealed, the surface facing the outer peripheral surface of the first member to be sealed (the inner peripheral surface of the hole of the second member to be sealed and the concave portion) is selected as described above. Focusing on the fact that the side end surface of the second sealed member (for example, the rear end surface of the stationary sealing ring) can be selected,
It is possible to seal the space between the first cylindrical surface to be sealed and the second flat surface to be sealed which moves relatively perpendicular to the axis thereof without causing the above-mentioned problem. It is another object of the present invention to provide a sealing device that can exhibit a proper sealing function according to sealing conditions.

[0007]

As described above, a sealing device according to the present invention, which has solved the above-mentioned problem, has a first cylindrical surface to be sealed and a second planar surface which is relatively moved perpendicularly to its axis.
It is for sealing between the surface to be sealed and, in particular, includes the following seal ring member, holding ring member, binding member, and urging member.

[0008] That is, the seal ring member is formed by arranging a plurality of seal rings in which at least one portion in the circumferential direction is separated in the axial direction in a state where the separated portions are inconsistent in the circumferential direction. The inner peripheral surface of each seal ring is the first ring
The first sealing surface is configured to be in contact with the surface to be sealed over the entire circumference thereof, and the axially opposed end surfaces of each sealing ring and another sealing thing adjacent thereto are completely in contact with each other. The end face of the seal ring, which constitutes one end face of the seal ring member in the axial direction, is constituted by a planar second seal face which is in contact with the second face to be sealed. In addition, the holding ring member is formed by separating at least one location in the circumferential direction and a location inconsistent in the circumferential direction with a separation location of each seal ring, and the seal ring member excluding the first to third sealing surfaces. The seal ring member is internally fitted and held in contact with the entire peripheral surface portion. In addition, it is preferable that each of the facing separation end surfaces of the seal ring member and the holding ring member is formed as a concave-convex surface that closely engages with each other. The binding member binds the holding ring member so as to urge and hold the holding ring member and the seal ring member fitted thereinto in a complete ring shape which abuts at the cutoff point. The urging member presses and biases the holding ring member in the axial direction so as to press the second seal surface against the second sealed surface and also press the third seal surfaces against each other.

According to the sealing device having such a configuration, the plurality of seal rings constituting the seal ring member are flexible, at least one of which is cut off, and the complete ring abuts at the cut off position by the binding member. Since it is urged and held by the urging member and pressed and urged against the second sealed surface by the urging member, even when the two sealed surfaces relatively move in the radial direction, the axial direction, or the like, it follows the movement. In addition, the first and second sealing surfaces are in contact with the first and second sealed surfaces, and the third sealing surfaces are appropriately in contact with each other, so that the two sealed surfaces can be properly sealed. In addition, the seal ring member is composed of a plurality of seal rings that are in contact with each other on the third seal surface, and the cut-off point of each seal ring and the cut-off point and holding of another seal ring adjacent to the seal ring. The fluid to be sealed (hereinafter referred to as “sealed fluid”) because the location where the ring member is separated is inconsistent
The leakage path becomes extremely long and complicated (a kind of labyrinth structure), so that even when the follow-up displacement to the surface to be sealed occurs, the first to third passages can be obtained even under high pressure conditions. The sealing surface allows the sealed fluid to be well sealed. Such an operation and effect can be exhibited more favorably by forming the opposing separated end surfaces on uneven surfaces which are closely engaged with each other to make the leak path longer and more complicated. Become. In addition, in the above-described structure, since the material of each component member can be arbitrarily selected according to the sealing condition, the sealing condition is not restricted from the material like the elastomer seal. For example, even under a high-temperature condition where an elastomer seal cannot be used, a good sealing function can be exhibited by forming each component member with a heat-resistant material.

[0010]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be specifically described with reference to FIGS.

FIG. 1 shows a non-contact type mechanical seal used in rotating equipment mainly handling gases (steam, nitrogen, argon, hydrogen, natural gas, air, etc.) such as a turbine, a blower, and a centrifugal compressor. 1 shows a non-contact type mechanical seal (gas seal) for sealing a shaft of a steam turbine. In this mechanical seal, an annular rotary seal ring 2 fixed to a rotary shaft 1 serving as a turbine shaft and a seal. Due to the relative rotation of the annular stationary sealing ring 4 held non-rotatably and axially movable in the case 3, the high-pressure fluid region (in-machine steam region) H as a sealed fluid region and the low-pressure fluid region as an unsealed fluid region A region (external air region) L is configured to be sealed, and in this example, a seal device 5 according to the present invention is particularly provided between the seal case 3 and the stationary sealing ring 4. It is more secondary seal.
In the following description, for the sake of convenience, front and rear mean left and right in FIG.

The rotary seal ring 2 is made of a super hard material such as WC or SiC. As shown in FIG. 1, the seal end face 2a as a rear end face has an appropriate shape such as an L shape or a spiral shape. A dynamic pressure generating groove 2b is formed.

As shown in FIG. 1, the seal case 3 has a circular guide surface 3a formed on an inner peripheral portion thereof and an annular wall portion 3b.
And the cylindrical wall portion 3c is integrally formed concentrically. The rotating shaft 1 passes through the annular wall 3b and the cylindrical wall 3c concentrically.

The stationary sealing ring 4 is made of carbon or the like which is relatively softer than the material of the rotary sealing ring 2. As shown in FIG. 1, the front sealing end face 4 a is a sealing end face of the rotary sealing ring 2. In the state of being opposed to 2a, it is loosely fitted to the cylindrical wall portion 3c of the seal case 3, and is also internally fitted and held movably in the axial direction with a very small gap in the guide surface 3a of the seal case 3. ing. In addition, the rear end surface side region (back side region) of the stationary sealing ring 4 is communicated with the high-pressure fluid region H via a fitting portion with the guide surface 3a.

As shown in FIGS. 1 to 4, the sealing device 5
Cylindrical wall 3c of seal case 3 as a first member to be sealed
And a stationary sealing ring 4 as a second member to be sealed, that is, a first cylindrical surface 3d which is a smooth cylindrical surface formed by the outer peripheral surface of the cylindrical wall portion 3c and the first sealing surface 3d are orthogonal to the axis thereof. And a secondary seal between the first sealed surface 3d and the second sealed surface 4b, which is a smooth annular flat surface formed by the rear end surface of the stationary sealing ring 4 which can relatively move in the radial or axial direction. It includes a seal ring member 6, a holding ring member 7, a binding member 8, and an urging member 9.

The seal ring member 6 is shown in FIGS.
As described above, the first and second seal rings 6 ₁, 6_TwoConsists of
Double seal ring 6₁, 6_TwoHas the same shape and material
It has a circular ring shape with a rectangular cross section. First
Seal ring 6₁Is shown in FIG. 3 and FIG.
Two places 61 equally spaced in the direction (180 °)₁, 61
₁, Ie two semi-circular rings
Part is divided into two semicircular ring parts
61₁, 61₁The inner and outer peripheral surfaces are
A ring shape that forms a perfect circle, that is, a perfect ring shape
It is configured to: Second seal ring 6_TwoWell
Similarly, as shown in FIG. 3 and FIG.
Two places 61 separated by an interval (180 °)_Two, 61_Twosmell
And split into two semi-circular rings.
To separate the two semicircular ring portions 61_Two, 61_TwoIn opposition
The outer and inner peripheral surfaces are perfectly circular
Ring configuration, that is, complete ring configuration
I have. By the way, in this example, each seal ring 6₁, 6
_TwoInstead of using the general cutting method,
Separation point 61₁, 61_TwoPlane with smooth cut end face at
Use a cutting tool (cutting blade, gas laser, etc.)
(Or cut each semi-circular ring part
), But simply shearing force with a press machine etc.
To make two semi-circular
It is separated to the ringing part. That is, each sea
Luling 6₁, 6_TwoIs divided into two
It is separated (divided) into semicircular ring portions. I
Therefore, each separation point 61₁, 61_TwoOpposing disconnection at
End face 62₁, 62₁And 62_Two, 62_TwoIs a general
Different from those obtained by cutting and cutting, shown in FIG.
It has fine irregularities and is divided into two
Part (semicircular ring part) into a complete ring form
In the case of
ing. When performing such a natural split,
Make a slight cut line (scratch) at the desired part to be separated in advance.
The seal ring 6₁, 6_TwoWhere desired
Cut accurately and properly so as not to cause any defects
It is preferable to devise it.

The seal ring member 6 is shown in FIGS.
As described above, the first seal ring 6₁Rear end face 6d and second seal
Ring 6_TwoIn parallel with the front end face 6e of the
First seal ring 6₁Separation point 61₁, 61₁And the second
Seal ring 6_TwoSeparation point 61_Two, 61_TwoIs circumferential
In a state in which the holding ring member 7 and the
And is fitted and held on the rotating shaft 1 by the
Pressed and biased to the stationary sealing ring 4 by the biasing member 9
It is. Thus, the first seal ring 6₁Front end face 6c
Is a smooth annular plane orthogonal to the axial direction,
Closely contact the second sealed surface 4b which is the rear end surface of the stationary sealing ring 4.
It is configured on a second seal surface that can contact. In addition, both
Ring 6₁, 6_TwoOf the opposite end faces in the axial direction of the
First seal ring 6₁Rear end face 6d and the second seal ring
Group 6_TwoIs a smooth ring perpendicular to the axial direction.
A third plane, which is in the form of
Is configured on the tool surface. In addition, complete ring form
Each seal ring 6₁, 6 _TwoInner peripheral surfaces 6a and 6b of
It is a smooth cylindrical surface and the outer peripheral surface of the cylindrical wall portion 3c
A close contact with a certain first sealed surface 3d over the entire circumference thereof;
On the first sealing surface.

As shown in FIG. 1 and FIG. 2, the holding ring member 7 is provided on the entire peripheral surface portion of the seal ring member 6 except for the first to third sealing surfaces 6a to 6e (that is, the sealing member which is closely contacted in parallel in the axial direction). while in contact with the ring 6 _and 62 the outer peripheral surface and the rear end face of the second seal ring 6 _2), in which a circular ring-shaped cross-sectional L-shape that can be fitted to the seal ring member 6. Thus, as shown in FIG. 3, the holding ring member 7 is cut off at two locations 71, 71 at equal intervals (180 °) in the circumferential direction, that is, at two semicircular ring portions. The two semi-circular ring portions are divided, and the inner and outer peripheral surfaces are formed into a completely circular ring shape, that is, a complete ring shape by abutting the cut portions 71, 71. In this example, the separation of the holding ring member 7 is performed by a natural splitting method as in the case of the seal rings 6 ₁ and 6 ₂ described above. As shown in FIG. 4, an uneven surface which has fine unevenness and which closely engages (abuts) each other when two divided portions (semicircular ring portions) are abutted in a complete ring form. Has become. Further, in this example, the minimum diameter inner peripheral surface 7b of the holding ring member 7 is a smooth cylindrical surface, and the first auxiliary sealing surface that can be in close contact with the first sealed surface 3d over the entire circumference. The front end face 7c is a smooth annular flat surface orthogonal to the axial direction, and is configured as a second auxiliary sealing surface that can come into close contact with the second sealed surface 4b. That is, the first auxiliary seal surface 7b or the second auxiliary seal surface 7c
Is flush with the first sealing surface 6a, 6b or the second sealing surface 6c of the sealing ring member 6, and the first sealed surface 3
d or the second sealed surface 4b. In addition, the holding ring member 7 is configured such that each of the separation points 71 is a separation point of the seal ring member 6, that is, both seal rings 6 ₁ , 6
₂ dissecting portion 61 ₁ ..., 61 ₂ ... (4 places) and in a state of conflict in the circumferential direction (see FIG. 3), the first serving and the minimum diameter inner peripheral surface auxiliary seal surface 7b and the front end face serving as second auxiliary The seal surface 7c is closely fitted to the seal ring member 6 in a state where the seal surface 7c is in close contact with the first seal surface 3d and the second seal surface 4b, respectively (see FIG. 2).

By the way, as the constituent material of each of the seal rings 6 ₁ and 6 ₂ and the holding ring member 7, any material can be arbitrarily selected according to use conditions and the like. For example, when used under high temperature conditions, a material having high heat resistance is selected. In this example, since it is necessary to use a material having such properties that the above-described natural splitting can be easily performed (a material having high toughness is excluded), a sealing function such as a sliding property with the sealed surfaces 3d and 4b is required. In consideration of the above, each seal ring 6 ₁ , 6 ₂
And the holding ring member 7 is made of carbon.

The binding member 8 is an annular garter spring engaged with an annular recess 7d formed on the outer peripheral surface of the holding ring member 7, as shown in FIGS. The garter spring 8 serving as a binding member binds the holding ring member 7 in a complete ring shape while pressing the holding ring member 7 in the diameter reducing direction. (Engaged state). As a result of the retaining ring member 7 being tightened by the garter spring 8, the seal rings 6 ₁ and 6 ₂ constituting the seal ring member 6 are also tightened via the holding ring member 7 in the radial direction. , so that the facing separating edge 61 _1, 61 ₁ and 61 _2, 61 ₂ is energized held in abutment state (uneven engagement state).

The urging member 9 is, as shown in FIGS.
(Only one is shown) interposed between the retaining ring member 7 and the annular wall portion 3b of the seal case 3, and the second seal surface 6c is replaced with the second seal surface 4b. And the third sealing surface 6
The holding ring member 7 is pressed and urged in the axial direction so that d and 6e are brought into contact with each other. That is, the coil springs 9a... Urge the holding ring member 7 toward the stationary sealing ring 4 via the spring receiver 9a which is a metal annular plate loosely fitted to the cylindrical wall portion 3c of the seal case 3, and Further, the stationary sealing ring 4 is pressed and urged toward the rotating sealing ring 2 via the holding ring member 7. The coil springs 9a are connected to the seal case 3.
Are arranged at equal intervals in the circumferential direction in an annular region surrounding the cylindrical wall portion 3c.

In the non-contact type mechanical seal configured as described above, with the relative rotation of the two sealing rings 2 and 4 due to the rotation of the rotating shaft 1, the action of the dynamic pressure generating groove 2b causes the sealing end faces 2a and 2a to be closed. A dynamic pressure is generated between 4a. as a result,
This dynamic pressure, the back pressure acting on the stationary sealing ring 4 (depending on the pressure (steam pressure) of the sealed fluid in the high-pressure fluid region H), and the urging force of the coil springs 9a are balanced, and the distance between the sealing end faces 2a, 4a is increased. Is held in a non-contact state in which a fluid film is formed by a sealed fluid (steam), and the high-pressure fluid region H and the low-pressure fluid region L are sealed in this fluid film forming portion.

At this time, the seal case 3 (cylindrical wall 3
Between the c) and the stationary sealing ring 4, the secondary sealing is favorably performed by the sealing device 5 while allowing the displacement of the stationary sealing ring 4.

That is, the seal rings 6 ₁ and 6 ₂ (and the holding ring member 7) constituting the seal ring member 6 are:
Each of the seals is divided into two semi-circular ring portions. However, since each of the seals is urged and held in the form of a complete ring by being bound by the garter spring 8 serving as a binding member, each of the seals in the form of a complete ring is formed. First sealing surfaces 6a and 6b formed by the inner peripheral surfaces of rings 6 ₁ and 6 ₂ (and first auxiliary sealing surface 7b formed by the minimum diameter inner peripheral surface of holding ring member 7).
However, while allowing relative movement in the radial direction (the direction perpendicular to the first sealed surface 3d), the first sealing surface 3d is closely contacted over the entire circumference thereof. At the same time, the seal rings 6 ₁ and 6 ₂ (and the holding ring member 7) are pressed and urged toward the second sealed surface 4b by the plurality of coil springs 9a. ring ₆₁ of the front end face serving as second sealing surface 6c (and the second auxiliary sealing surface 7c formed at the front end face of the retaining ring member 7) and the sealing ring 6 _and 62 of the facing end surface serving as a third sealing surface 6d, 6e while permitting relative movement in the axial direction (the direction perpendicular to the second seal 4b) of the second seal surface 6c.
(And the second auxiliary sealing surface 7c) is brought into close contact with the second sealed surface 4b, and the third sealing surfaces 6d and 6e are brought into close contact with each other. Therefore, even when the stationary sealing ring 4 is displaced in the radial direction or the axial direction, or when vibration, pressure fluctuation, or the like of the device occurs, these can be followed or dealt with satisfactorily. A good seal (secondary seal) is formed between 3d and 4b, that is, between the seal case 3 and the stationary sealing ring 4.

By the way, each of the seal rings 6 ₁ and 6 ₂
Compared to the retaining ring member 7, the cross-sectional area (section modulus) is small, and the deformability (conformability) in the radial and axial directions is high.
For this reason, even when the spring force of the garter spring 8 and the coil springs 9a acting on the holding ring member 7 is not uniform, the spring force acts evenly, and the uniform and uniform force is exerted on the surfaces 3d and 4b to be sealed. It will be pressed properly. Similarly, the third and third sealing surfaces 6d and 6e of the seal rings 6 ₁ and 6 ₂ are also pressed uniformly and appropriately. Therefore, the first and second sealing surfaces 6a, 6b, 6 are substantially located between the sealed surfaces 3d, 4b.
c on the surfaces to be sealed 3d, 4d and the third sealing surface 6
d and 6e are properly sealed by mutual contact, and the first and second auxiliary sealing surfaces 7b and 7c merely perform an auxiliary sealing function. The first and second auxiliary sealing surfaces 7b and 7c cooperate with the fitting and sealing surfaces of the holding ring member 7 with the sealing rings 6 ₁ and 6 ₂ to separate the cut-off portions 61 of the sealing rings 6 ₁ and 6 _{2. 1,} 61 the separating portion 61 ₁ in the case _{where 2} is opened, 61 ₂ and the sealing surface 3d, 4
The function of shutting off the leak passage of the sealed fluid formed between the first and second seals b.

Further, since the seal rings 6 ₁ and 6 ₂ and the holding ring member 7 are flexible divided into semicircular ring portions as described above, the stationary sealing ring 4
Satisfactorily follows the vibrations and pressure fluctuations of the equipment, but instantaneously disconnects the parts 61 ₁ , 61 ₂ , 7
1 may open to cause leakage of the sealed fluid (steam leakage). However, the third sealing surface 6
d, 6e, a plurality of seal rings 6 ₁ , 6 contacting each other.
Be composed of _2, the seal ring _61, six _second contact portion 61 ₁ ..., 61 ₂ ... and that as well as the cut separating portion 71 of the retaining ring member 7 ... are discrepancies not coincident Opposed separation end surfaces 6 at separation locations 61 ₁ , 61 ₂ , 71
Since 21 ₁ , 62 ₁ , 62 ₂ , 62 ₂ and 72, 72 are formed on the uneven surfaces which are closely engaged with each other, the object existing between the sealing device 5 and the surfaces 3 d, 4 b to be sealed. The leakage path of the sealing fluid becomes extremely long and complicated (a kind of labyrinth structure). Therefore, even when the cut-off portions 61 ₁ , 61 ₂ , 71 are opened, a series of short leak passages penetrating both ring members 6, 7 is not formed. As a result, while being able to favorably follow the stationary sealing ring 4 and cope with vibrations and pressure fluctuations of the equipment, it is possible to satisfactorily seal the fluid to be sealed not only under low pressure conditions but also under high pressure conditions. can do. In particular, a plurality of seal rings 6
_1, be kept constituted by 6 _2, in order to exhibit excellent sealing function under high pressure conditions conditions is very important. This has been confirmed by the following comparative experiment. That is, in this experiment, the above-described sealing device 5 according to the present invention (as shown in FIGS. 1 to 4, a non-contact type mechanical seal for sealing the shaft of a steam turbine was used as a secondary sealing device for the stationary sealing ring 4). Was used to seal the inside steam region H and the outside air region L under different sealing conditions (steam pressure, steam temperature), and the amount of steam leakage under each sealing condition was measured. At the same time, the point that the seal ring member is constituted by one seal ring (the shape (inner / outer diameter, axial thickness) of this seal ring member and the material (carbon) are the seal rings 6 ₁ and 6 in the seal device 5 according to the present invention). _{The two} regions H and L are described above using a sealing device (hereinafter, referred to as a "comparative device") which is completely the same as the sealing device 5 except for the sealing ring member 6 made of ₂ ). Sealing was performed under the same sealing conditions, and the amount of steam leakage (condensed water amount) under each sealing condition was measured. As a result, the sealing device 5 according to the present invention
The vapor pressure of 5 k was used when using any of the apparatus of Comparative Example and Comparative Example.
g / cm ² or less and a vapor pressure of 200 ° C. or less under a low load sealing condition (an allowable leak amount generally required under the sealing condition is 1 kg / h or less), and a vapor pressure of 10 k
g / cm ² , high-pressure sealing conditions with a vapor pressure of 250 ° C. (The allowable leakage generally required under the sealing conditions is 2 k.
g / h or less), the steam leak rate was within the allowable leak rate range. However, the measured value of the amount of steam leakage when the sealing device 5 according to the present invention is used, under both the low-load sealing condition and the high-load sealing condition,
The measured value of the amount of steam leak in the case of using the comparative example device was significantly lower than the measured value, and it was confirmed that the sealing performance of the sealing device 5 was remarkably excellent.

The material of each component can be selected in accordance with the sealing conditions (for example, a heat-resistant material is selected under high temperature conditions). Therefore, the elastomer seal described at the beginning is used. Conditions that are not possible (for example,
Under high temperature conditions), it can be suitably used,
A good sealing function can be exhibited. This is easily understood from the above experimental results.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately changed and improved without departing from the basic principle of the present invention.

For example, the number of seal rings constituting the seal ring member 6 is arbitrary, and the seal ring member 6 may be constituted by three or more seal rings arranged in the axial direction. Of course, irrespective of the number of seal rings constituting the seal ring member 6, the separation point of each seal ring is circumferentially separated from the separation point of another seal ring adjacent to the seal ring and the separation point of the holding ring member 7. It is preferable to make a conflict.

Further, the number of the seal rings ₆₁ and 62 separating portion 61 ₁ in the _2, 61 ₂ is also arbitrary, structure to that disconnect each sealing ring 6 _and 62 at three locations or more in the circumferential direction be of course, as shown in FIG. 5 (a), it is also possible to keep configuration to that disconnect only one place 61 _1, 61 ₂ in the circumferential direction. Thus, in the case where the sealing ring 6 _and 62 was disconnected only one place 61 _1, 61 ₂ arrangement, of course that you select the one corresponding to the sealing conditions as a constituent material It is necessary to select a material having elasticity (energy elasticity) enough to obtain the binding effect of the garter spring 8 (for example, carbon, engineering plastic, or the like). However, when the seal ring has a complete ring shape that has not been cut off, the seal ring may be easily deformed due to pressure fluctuation in the high-pressure fluid region H, vibration accompanying rotation of the rotating shaft 1, or the like. Flexible materials, for example, elastomer materials such as rubber and elastic materials such as soft plastics, of course,
Excluded. In addition, the number of the cut-off portions 71 of the holding ring member 7 is also arbitrary, and even if the cut-off portion 71 is cut off at three or more positions in the circumferential direction, as shown in FIG. Even if it makes it do, it may be any.
As a constituent material of the holding ring member 7 in which only one portion 71 is cut off, as in the case of the seal ring, carbon, engineering plastic, or the like having elasticity (energy elasticity) enough to obtain the binding effect by the garter spring 8 ( It is necessary to select an elastomer material such as rubber or a flexible or elastic material such as soft plastic which is easily deformed by pressure fluctuation of the high-pressure fluid region H or vibration accompanying rotation of the rotating shaft 1). There is. Note that FIG.
In the example (B), the sealing ring 6 _and 62 and a retaining ring member 7, in consideration of the sliding property and the like of the sealing surface 3d, 4b, there as being made of carbon.

The number of cut-off points depends on the seal ring member 6.
Seal ring and holding ring member 7 constituting
(For example, see FIGS. 3 and 5B), differ for all the seal rings and the holding ring members 7, and differ for the seal ring and the holding ring members 7 (for example, see FIG. 5A). , May be used. Of course, in any case, the separation point in each seal ring and the separation point of the holding ring member should be inconsistent in the circumferential direction, and at least the separation point in the seal ring adjacent in the axial direction should be It is preferable to make a difference in the circumferential direction.

Each of the seal rings 6₁, 6_TwoShape
Means that the holding ring member 7 has the first to third sealing surfaces 6a to 6e.
The seal ring member 6 is kept in contact with
To each other, and each adjacent seal in the axial direction.
Ning 6₁, 6_TwoOpposing end surfaces 6d and 6c
A third sealing surface that can be in contact with the first sealing surface and a cylindrical surface shape
The first sealed surface 3d and the planar second sealed surface 4b
And can seal between 3d and 4b on both sides
The condition can be set arbitrarily. this
As long as such conditions are satisfied, for example, each seal ring 6
₁, 6_TwoOuter peripheral surface and adjacent seal ring 6₁, 6_Twoof
Turning the opposing end surfaces 6d and 6c into a non-cylindrical surface such as a frusto-conical surface
It is also possible to have a curved surface shape. In particular, each seal ring
Group 6₁, 6 _TwoOuter peripheral surface and retaining ring part fitted on the outer peripheral surface
The inner peripheral surface of the material 7 is enlarged in a direction toward the second sealed surface.
If a series of frusto-conical surfaces is used, the first sealed surface and the second
The sealing function with the surface to be sealed is the same as the above example.
Garter spring 8
The tightening force of the holding ring member 7 is applied to the second sealed surface of the second seal surface.
Pressure on the ring surface (acts on the mating surface of both ring members 6 and 7).
Also acts as an axial component of the radial force (binding force).
Will be.

The sealing device 5 according to the present invention has a cylindrical first surface to be sealed and a flat second surface which can be moved relative to the first surface to be sealed in the radial or axial direction perpendicular to the axis thereof. The mechanical seal provided on the shaft sealing portion of a fluid machine or a pneumatic machine or the mechanical seal provided on the shaft sealing portion (provided that the above-mentioned non-contact surface is provided), provided that the two sealed surfaces exist and it is necessary to seal between the two sealed surfaces. It can be used for the secondary seal of a mechanical seal or a contact mechanical seal). The components of the ring members 6 and 7 and the surfaces to be sealed can be appropriately selected according to the sealing conditions. Can do it. For example, as shown in FIG. 6, the sealing device 5 can be suitably used for sealing between the seal case 3 and the rotating shaft 1 passing therethrough. That is, in the sealing device 5 shown in FIG. 6, the first sealed surface 1 a which is a cylindrical surface formed by the outer peripheral surface of the rotating shaft 1 and the second sealed surface which is an annular flat surface formed by the wall surface of the seal case 3. Face 3
e is sealed (primary seal) by a seal ring member 6 composed of a plurality of seal rings 6 ₁ and 6 ₂ and a holding ring member 7. In this case, each of the seal rings 6 ₁ and 6 ₂ and the holding ring member 7
Is held on the seal case 3 side by a suitable rotation preventing means (drive pin or the like) so as to be relatively non-rotatable.
The sealing surfaces 6a, 6b, the first auxiliary sealing surface 7b, and the first sealed surface 1a are designed to relatively slide in the circumferential direction. The biasing member 9 includes a plurality of coil springs 9a (only one is shown) interposed between a spring retainer 3f provided in the seal case 3 and the holding ring member 7, and the holding ring member 7 is The pressure is applied to the second sealed surface 3e. The configuration other than the above-mentioned point is the same as that shown in FIG. 1, and the same components are denoted by the same reference numerals as those in FIG.

Further, each of the to-be-
As described above, the surfaces 7b and 7c opposed to the
Ring 6₁, 6_TwoSeal ring in conjunction with
Group 6 ₁, 6_TwoEach separation point 61 of₁, 61_TwoFluid leakage from
It is only necessary to function so as to prevent the first and the second.
2. Demonstrate sealing function like sealing surface 6a, 6b, 6c
It is not necessary to keep it. However,
As described above, together with the first and second sealing surfaces 6a, 6b, 6c
Constructed on auxiliary sealing surfaces 7b and 7c capable of performing sealing action
To achieve a better sealing function
Can be

A garter spring is suitable as the binding member 8, but is not limited thereto. Of course, the location to be bound by the binding member 8 such as a garter spring may be one location in the axial direction of the holding ring member 7 or a plurality of locations (a plurality of garter springs or the like are used). , Each seal ring 6 ₁ ,
6 ₂ on a condition that can be biased retaining complete ring form properly abut with separating portions 61 _1, 61 _2, it is desirable to set.

The present invention also relates to a cylindrical or cylindrical first member.
The relative movement of the two sealed members (the relative movement in the axial or radial direction of the first sealed member) between the member to be sealed and the second member to be sealed having a circular hole or a circular recess fitted or engaged with the member. It is needless to say that the present invention can be suitably applied to any case where it is necessary to perform sealing in a state where the condition (1) is permitted.

[0037]

As can be easily understood from the above description, according to the present invention, the first sealed surface having a cylindrical surface and the second sealed surface which is relatively moved perpendicularly to the axis thereof. Can be satisfactorily sealed, and a practical and simple sealing device for a secondary seal portion or the like of a mechanical seal can be provided. Moreover, unlike the case where a general elastomer seal is used, the material of the constituent members can be arbitrarily selected according to the sealing conditions, so that an appropriate sealing function can be exerted under any sealing conditions. .

[Brief description of the drawings]

FIG. 1 is a half cut longitudinal side view showing an example of a sealing device according to the present invention.

FIG. 2 is an enlarged detail view showing a main part of FIG. 1;

FIG. 3 is a vertical cross-sectional rear view along the line III-III in FIG. 1;

FIG. 4 is an enlarged detail view showing a main part of FIG. 3;

FIG. 5 is a longitudinal sectional rear view showing a modification and corresponding to FIG. 3;

FIG. 6 is a half longitudinal section view showing another modification.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotating shaft, 1a, 3d ... 1st to-be-sealed surface, 2 ... Rotary sealing ring, 3 ... Seal case, 3c ... Cylindrical wall part, 3e, 4
b: second sealed surface, 4: stationary sealing ring, 5: sealing device, 6: seal ring member, 6a, 6b: first sealing surface, 6c: second sealing surface, 6d, 6e: third sealing surface,
6 ₁ , 6 ₂ ... seal ring, 61 ₁ , 61 ₂ , 71 ... cut-off point, 62 ₁ , 62 ₂ , 72 ... cut-off end face, 7 ... holding ring member, 7b ... first auxiliary seal face, 7c ... 2 Auxiliary sealing surface, 8: garter spring (tightening member), 9: urging member, 9a: coil spring.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yoshikatsu Tokutake 1 541 Shimouchi jinji battering ground, Mita City, Hyogo Prefecture Nippon Pillar Industry Co., Ltd. Mita Plant

Claims (2)

[Claims] 1. A sealing device for sealing between a first cylindrical surface to be sealed and a second planar surface to be moved relative to the axis perpendicular to the first surface to be sealed, comprising: a sealing ring member; The seal ring member includes a holding ring member, a binding member, and an urging member, and the seal ring member is configured such that a plurality of seal rings separated from at least one portion in the circumferential direction are aligned with each other in a state in which the separated portions are inconsistent in the circumferential direction. The inner peripheral surface of each seal ring is in contact with the first seal surface over the entire periphery thereof in the form of a complete ring abutting at the separation point. An axially opposed end face of each seal ring and another seal ring adjacent to the seal ring is formed as a third seal face in full contact with each other, and one end of the seal ring member in the axial direction. The end surface of the seal ring is formed on a planar second seal surface that is in contact with the second surface to be sealed, and the holding ring member is at least one location in the circumferential direction and separates each seal ring. A part which is inconsistent in the circumferential direction with the part is cut off, and the seal ring member is fitted and held in a state of being in contact with the entire peripheral surface part of the seal ring member except the first to third seal surfaces. Is to tighten the holding ring member in order to urge and hold the holding ring member and the seal ring member fitted thereinto in a complete ring form which abuts at the separation point,
The urging member presses and presses the holding ring member in the axial direction so as to press the second seal surface against the second sealed surface and to press the third seal surfaces against each other. Sealing device. 2. The sealing device according to claim 1, wherein each of the opposed cut-off end faces of the seal ring member and the holding ring member is formed with an uneven surface that closely engages with each other.