JP4147216B2 - Free ring type mechanical seal - Google Patents

Description

  The present invention relates to a mechanical seal that is suitably used under conditions of high temperature and high pressure, such as a shaft seal of a boiler circulation pump or a boiler feed water pump of a thermal power plant, for example, and more specifically, The present invention relates to a floating ring type mechanical seal that holds and holds a floating ring between the stationary ring on the seal casing side.

  This type of floating ring type mechanical seal holds a floating ring that is symmetrical or nearly symmetrical in the direction of the rotation axis between a rotating ring that is a rotating member and a stationary ring that is a fixed member. As a result, a structure that satisfactorily seals between the rotating ring and the stationary ring via the idle ring, and those disclosed in Patent Document 1 and Patent Document 2 are known.

  The seal structure will be described in detail. As shown in FIGS. 1 and 2, the rotary ring 6 that rotates integrally with the rotary shaft 1, the casing 2 is held slidably in the direction of the axis P, and the axis P The ring-shaped idler ring 5 having a cross-sectional shape that is substantially symmetrical in the direction of the axis P is sandwiched and held between the stationary ring 4 and the stationary ring 4 that is elastically biased toward the direction of the rotating ring 6. The sealed area E and the sealed area F can be shielded and sealed by the relative rotational sliding contact action of the seal surfaces 6a and 5c that are the contact surfaces of the ring 5 and the floating ring 5. The idle ring 5 has an annular main body portion 5A and a cross-sectional shape composed of an annular pressing portion 5B and a seal portion 5C having substantially the same shape protruding from both end faces in the axial center P direction in the axial center P direction. The pressing surface 5b which is a convex shape and is an end surface of the pressing portion 5B can freely contact the pressing surface 4a which is the end surface of the stationary ring 4, and the sealing surface 5c which is the end surface of the sealing portion 5C is the rotating ring 6. The seal surface 6a, which is the end surface of, is configured so as to be capable of relative rotational sliding contact.

  By the way, in a general mechanical seal that does not have an idle ring and is configured to seal the sealed fluid by the relative rotational sliding contact between the rotating ring and the stationary ring, when this is used under high pressure conditions In this case, the parallelism of the seal surface, which is the contact surface between the rotating ring and the stationary ring, is impaired, and a good sealing function cannot be exhibited. That is, since the stationary ring is slidably held in the axial direction in the seal casing so as to follow the rotating ring, the base end portion held by the casing depends on the fluid pressure in the sealed fluid region. The influence (pressure strain) is large in the tip side portion, that is, the seal surface side portion that is free by following the rotating ring, while being hardly affected. Therefore, the pressure strain distribution in the axial direction in the stationary ring becomes non-uniform, in other words, the pressure strain is greatly different between the proximal end portion and the distal end portion, and the stationary ring is greatly distorted with respect to the axis. As a result, the sealing surface of the stationary ring is inclined, and the parallelism with the sealing surface of the rotating ring is significantly deteriorated.

  On the other hand, in the above-described floating ring type mechanical seal, the floating ring 5 for exhibiting the sealing function by the relative rotational sliding contact action with the rotating ring 6 is sandwiched between the rotating ring 6 and the stationary ring 4. Since the pressure is held symmetrically or substantially symmetrical, the influence of the fluid pressure in the sealed region E can be received in a balanced manner in the axial direction. That is, the pressure strain generated in the idle ring 5 is substantially the same at both end portions, and is not greatly distorted with respect to the axis. Therefore, even under high temperature and high pressure conditions, the seal surface 5c of the idle ring 5 is not inclined with respect to the seal surface 6a of the rotating ring 6, and the parallelism of the seal surfaces 5c and 6a is maintained, which is favorable. A sealing function can be exhibited.

Such an idle ring type mechanical seal is generally equipped with a cylindrical adapter D having a centering function of the idle ring 5 as shown in FIGS. The adapter D is configured such that its root end is sandwiched between the retainer 7 and the flange (casing) 2 and is supported in a positioning state, and the tip thereof is configured to support the loose ring 5 by fitting. In addition to the centering function described above, the function of distributing flushing by a large number of radial direction arrival holes 16 in the circumferential direction and the function of protecting the seal portion from foreign matter are exhibited, and the stationary side seal portion such as the stationary ring 4 is provided. It is a functional component that may have a function of integration (modularization). Conventionally, as disclosed in Patent Documents 1 and 2 described above, this adapter is configured and incorporated into a single cylindrical part.
JP-A-9-229205 JP 2004-293766 A

  For example, in the case where the pump using the floating ring type mechanical seal is a horizontal type, etc., when the temperature difference between the upper and lower casings becomes large, or when the pressure of the fluid becomes extremely high and the pump casing becomes distorted, etc. Then, the seal casing and the adapter may be deformed following the deformation. In that case, the deformed adapter exerts an unreasonable force on the idler ring, and the idler ring hardly exhibits its normal function, and the sealing function may be lowered.

  An object of the present invention is to provide a floating ring type mechanical seal that can maintain the original excellent sealing function and improve the reliability by revising the structure of the adapter so that the above-mentioned inconvenience due to temperature difference and high pressure does not occur. The point is to provide.

The invention according to claim 1 is configured such that the floating ring 5 is sandwiched and held between the rotating ring 6 that rotates integrally with the rotating shaft 1 and the stationary ring 4 that is relatively fixed to the casing 2, and one end of the rotating ring 6 is the casing 2. In the floating ring type mechanical seal that is supported by the other end portion and is equipped with a cylindrical adapter D that supports the floating ring 5 in the other end.
The adapter D includes a cylindrical proximal adapter portion 12 supported by the casing 2, a cylindrical distal adapter portion 13 that internally supports the idle ring 5, and the adapter portions 12 and 13. front and rear, a left and right, and up and down in any direction within a predetermined range and a connecting means 14 for relatively movably coupled,
In the floating ring type mechanical seal, the connecting means 14 can be externally or internally fitted with a first end portion 12A of the proximal end side adapter portion 12 and a radial gap at the first end portion 12A. The distal end side adapter portion 13 having the second end portion 13A is screwed to the second end portion 13A and one of the first and second end portions 12 and 13, and is formed on the other end. And a pin member 19 that can be inserted into the mounting hole 18, and the diameter of the portion of the pin member 19 that is inserted into the mounting hole 18 is smaller than the diameter of the mounting hole 18. It is characterized by this.

The invention according to claim 2 is the floating ring type mechanical seal according to claim 2, wherein the pin member 19 is an end portion located on the inner diameter side of the first end portion 12A and the second end portion 13A. It is characterized by being screwed onto

The invention according to claim 3 is the floating ring type mechanical seal according to claim 1 or 2, wherein the distal end side adapter portion 13 is fitted into the casing 2 through the seal ring 17 so as to be relatively movable. It is characterized by that.

The invention according to claim 4 is the floating ring type mechanical seal according to any one of claims 1 to 3, comprising the casing 2, the stationary ring 4 belonging thereto, and a component group including the adapter D. A stationary side seal portion K1 and a rotation side seal portion K2 composed of a group of members including the sleeve 3A that can be fitted and fixed to the rotation shaft 1 and the rotation ring 6 belonging to the sleeve 3A are included in both the seal portions K1 and K2. A cartridge-type member that is integrally connected in a state in which the floating ring 5 is sandwiched and held between the stationary ring 4 and the rotating ring 6 by a set member 32 that is detachably provided across the bridge. It is characterized by that.

According to the first aspect of the present invention, the adapter has a configuration in which the proximal end adapter portion and the distal end side adapter portion are integrally connected with a backlash (gap) by the connecting means. And the distal end adapter portion can move slightly in the three-dimensional directions of the front, rear, left, right, and top and bottom.

What slave, and when the temperature difference between the upper and lower casing is increased, even when degree of situation distorted casing itself pressure of the fluid becomes significantly high, a split-type adapter according to the present invention, the connection means Due to the gap existing in any of the three-dimensional directions, the relative posture between the proximal end adapter portion and the distal end adapter portion changes, so that the distortion can be absorbed, and the proximal end adapter portion and the distal end adapter portion It will not distort itself.

  As a result, a high temperature, high pressure, etc. can be obtained by contriving an adapter with a plurality of parts having a split structure in which the base side adapter part supported by the casing and the front end side adapter part that supports and supports the floating ring are connected by connecting means. Even when the casing and the rotating shaft are distorted due to the above, the floating ring centering function by the adapter on the tip side is ensured, and a good sealing function can be maintained to improve reliability. An annular mechanical seal can be provided. This idle ring type mechanical seal can be suitably used for, for example, boiler circulation or a feed water pump in a thermal power plant, and has a great practical advantage.

According to the invention of claim 1, means for connecting while permitting some relative attitude change and a base end side adapter and distal end adapter section, is screwed either one of the adapter part, and one This can be realized with a simple and inexpensive configuration in which only a pin member inserted through the hole of the other adapter portion is provided. Therefore , there exists an advantage which can acquire the said effect | action and effect economically.

According to the invention of claim 2 , the pin member in the connecting means is screwed to the end portion located on the inner diameter side of the first end portion and the second end portion, and the end portion located on the outer diameter side is screwed. Since it is configured to be inserted into the hole, details will be described in the embodiment, but the assembly work can be performed by screwing the pin member from the outer diameter side (outer side) of the cylindrical adapter. It is possible to make a floating ring type mechanical seal that is easy to disassemble and easy to disassemble and excellent in ease of assembly and maintainability.

According to the invention of claim 3 , since the distal end side adapter portion is fitted into the casing through the seal ring so as to be relatively movable, relative movement in the three-dimensional direction is possible between the proximal end adapter portion and the base end side adapter portion. Although it is a simple structure, in other words, a rattling structure, it can be regulated by the casing so that the distal end side adapter portion does not swing more than necessary. As a result, an excellent sealing function by the idle ring is more stably exhibited, and any one of the actions and effects according to claim 1 or claim 2 is enhanced.

According to the invention of claim 4 , although described in detail in the embodiments, the cartridge-type structure has a large number of parts and assembly and disassembly work of a floating ring type mechanical seal that requires difficult assembly, In addition, the installation work to the actual machine is simplified, and there is an advantage that assembly, disassembly, and maintenance can be easily performed even if the person is not a skilled person such as a beginner or an inexperienced person.

  Embodiments of a floating ring type mechanical seal according to the present invention will be described below with reference to the drawings. FIG. 1 is an overall sectional view showing the structure of a floating ring type mechanical seal, FIG. 2 is an enlarged sectional view of an adapter portion, and FIG. 3 is a component diagram of the adapter.

[Example 1]
As shown in FIGS. 1 and 2, the idle ring type mechanical seal A according to the first embodiment rotates a rotating base 3 that is externally fitted to a rotating shaft 1 having a rotating shaft center P in an integrally rotating state, and rotates the rotating base 3. A casing (seal casing) 2 that surrounds and supports freely, and a seal mechanism S provided in an annular space between the rotating base 3 and the casing 2 are configured. The seal mechanism S includes a stationary ring 4 that is projected and urged in the direction of the rotation axis P with respect to a retainer 7 that is supported relative to the casing 2 so as not to rotate relative thereto, a rotating ring 6 that rotates integrally with the rotating base 3, and a stationary ring 4. Between the floating ring 5 and the adapter D that fits and supports the floating ring 5 while being fitted and supported in the casing 2. In addition, 22 is a flushing liquid inlet formed in the casing 2, 23 is a flushing liquid outlet, and 25 is a pump casing.

  The rotation base 3 is composed of a cylindrical sleeve 3A that is externally fitted to the rotation shaft 1 in a relatively fixed state and is long in the direction of the rotation axis P, and a pumping ring (labyrinth seal ring) 3B that is bolted to the sleeve 3A. . A stop ring 27 is fitted and fixed to the outer end portion of the sleeve 3A using a screw 26, and the stop ring 27 is fitted and fixed to the rotary shaft 1 using a screw 28. The rotating base 3 rotates integrally with the rotating shaft 1. A sleeve 3 </ b> A sealed between the outer peripheral surface of the rotary shaft 1 by two O-rings 29 is fitted so that a rotary ring (seal ring) 6 can be held via a reinforcing ring 30. . The rotary ring 6 is configured to rotate integrally with the sleeve 3 </ b> A by a set screw 31 that passes through a hole (not shown) of the reinforcing ring 30 that is externally fitted to the rotary ring 6.

  The stationary ring 4 is slidable on the annular retainer 7 in the direction of the rotation axis P and is non-rotatably fitted by a pin p1 and is fixed to the retainer 7 by a plurality of coil springs 8 arranged in the circumferential direction. The projection is biased in the direction of the rotation axis P. An O-ring 9 for sealing and a backup ring 20 are fitted between the stationary ring 4 and the retainer 7. That is, the floating ring type mechanical seal A according to the first embodiment is configured as a “stationary type” that holds the floating ring 5 between the rotating ring 6 by pressing the stationary ring 4 in the direction of the rotation axis P. Has been. Incidentally, although illustration is omitted, the structure in which the rotating ring 6 is pressed and held against the rotating base 3 to hold the idle ring 5 between the stationary ring 4 is called “rotating type”.

  The retainer 7 is fitted in the casing 2 in a state of being loosely fitted to the sleeve 3A, and is connected to the casing 2 by a bolt 21 along the rotation axis P direction so as not to be relatively rotatable. A cylindrical adapter D is supported in a fitting portion between the retainer 7 and the casing 2 so as to be fitted into the casing 2, and is fitted into a tip portion thereof, and the rotating ring 6 and the stationary ring. The idle ring 5 is installed in a state of being interposed between the rotation axis P 4 and the direction of the rotation axis P 4. Reference numeral 24 denotes an O-ring straddling the retainer 7, the casing 2, and the adapter D.

  An idle ring 5 that is loosely fitted to the sleeve 3A includes an annular main body portion 5A, an annular pressing portion 5B, and a seal portion 5C having substantially the same shape projecting in the direction of the rotation axis P from both end faces thereof. The cross-sectional shape has a convex shape, and the plurality of pins p <b> 2 provided over the main body portion 5 </ b> A and the stationary ring 4 are disposed so as not to rotate relative to the stationary ring 4. Further, in the main body 5A of the idle ring 5, flushing holes 11 penetrating in the direction of the rotation axis P are formed at a number of locations in the circumferential direction, and the flushing liquid is configured to flow freely in the direction of the rotation axis P. Yes.

  The floating ring 5 is held between the rotating ring 6 and the stationary ring 4 by the elastic force of the coil spring 8, and the pressing surface 4 a that is the end surface of the pressing part 4 </ b> A of the stationary ring 4 and the pressing part of the floating ring 5. The pressing surface 5b of 5B is pressed and the sealing surface 6a of the rotating ring 6 and the sealing surface 5c of the seal portion 5C of the idle ring 5 are pressed. That is, since the rotary ring 6 and the idle ring 5 rotate relative to each other, the seal surface 6a and the seal surface 5c are in sliding contact with each other in a pressure contact state. Further, an O-ring 10 is fitted between the stationary ring 4 and the idle ring 5 that do not rotate relative to each other to improve the sealing performance.

  As shown in FIGS. 1 to 3, the adapter D includes a cylindrical proximal end adapter portion 12 that is fitted and supported in the casing 2, and a cylindrical distal end adapter portion 13 that internally supports the floating ring 5. And a connecting means 14 for connecting the adapter parts 12 and 13 so as to be movable relative to each other in a predetermined range in any of the three-dimensional directions of front and rear, left and right, and top and bottom (vertical, horizontal and height). Configured. The proximal-side adapter portion 12 is relatively fixed to the retainer 7 fitted therein by screws 15, is supported by being fitted inside the casing 2, and is passed through in a radial direction with respect to the rotational axis P. A hole 16 is formed. The distal-side adapter portion 13 is fitted into the casing 2 via two O-rings 17 (play-fit), and the spherical outer peripheral portion 5d of the idle ring 5 is formed on the inner peripheral surface 13a. It is structured to be fitted and supported. In addition, an inward flange 13b is formed at the outer end of the inner peripheral surface 13a in the direction of the rotational axis P so that the idle ring 5 cannot pass therethrough.

  The connecting means 14 includes a first end 12A that is the end on the distal end side adapter portion 13 of the base end side adapter portion 12 and a second end 12A that can be fitted to the first end 12A with a radial gap r. The second end portion 13A of the distal end side adapter portion 13 having the end portion 13A and the mounting hole 18 screwed into the first end portion 12A and formed in the second end portion 13A can be freely inserted (freely fitted). The pin member 19 is configured so that the diameter w of the portion of the pin member 19 inserted through the mounting hole 18 is smaller than the diameter v of the mounting hole 18. The pin member 19 is provided in a plurality of locations (for example, four locations) in the posture along the radial direction with respect to the rotation axis P and in the circumferential direction of the adapter D.

  The adapter D is configured such that the proximal end side adapter portion 12 and the distal end side adapter portion 13 are integrally connected with back and forth, right and left, and up and down with a backlash (gap) by the connecting means 14 described above. The adapter portion 12 and the distal-end-side adapter portion 13 can move slightly in the three-dimensional directions of front and rear, right and left, and up and down. As shown in FIG. 2, the movable range, that is, the predetermined range is, for example, a radial gap r of 0.5 mm, a diameter of the pin member 19 w + 2 × hmm = a diameter v of the mounting hole 18, and the rotation axis P. The dimensions are set so that there is a gap of h = 0.5 mm in any direction and h = 0.5 mm in any of the circumferential directions. The diameter of the inner peripheral surface 13a is preferably set to a value that is larger by about 0.05 mm than the outer diameter of the idle ring 5.

  In addition, the outer diameter of the distal end adapter portion 13 is set to a value slightly smaller than the inner diameter of the portion of the casing 2 in which the distal end adapter portion 13 is fitted. By adopting the configuration in contact with the casing 2, the distal end adapter portion 13 can be slightly changed in posture in the direction of the rotation axis P with respect to the casing 2. That is, the two O-rings 17 and 17 also have a cushioning function, and the distal end side adapter portion 13 can be moved with respect to the casing 2 in a slight amount.

  When the temperature difference between the upper and lower sides of the casing 2 becomes large, the pressure of the fluid becomes extremely high and the casing 2 itself is distorted, and the conventional integrated adapter follows the distortion of the casing and the like and is similarly distorted. Even in such a case, in the split-type adapter D according to the present invention, the relative posture between the proximal-side adapter portion 12 and the distal-side adapter portion 13 changes due to the gap existing in the three-dimensional direction described above, The distortion can be absorbed, and the proximal-side adapter part 12 and the distal-side adapter part 13 themselves are not distorted.

  As a result, by means of configuring the adapter D by a split structure in which the base end side adapter portion 12 that is fitted and supported in the casing 2 and the distal end side adapter portion 13 that supports and supports the floating ring 5 are connected by the connecting means 14. Even when the casing 2 or the rotating shaft 1 is distorted due to high temperature or high pressure, the centering function of the idler ring 5 by the tip side adapter portion 13 is ensured, and a good sealing function can be maintained. In addition, it is possible to provide a floating ring type mechanical seal A having excellent reliability.

  Since the adapter D and the retainer 7 are integrated with screws, both the D and 7 and the stationary ring 4 and the idle ring 5 provided in the adapter D have a function of preventing the inward flange 13b from coming off. It exists as a block of sealing mechanisms S (so-called ASSY parts) that are modularized. That is, the stationary ring 4, the idle ring 5, the coil spring 8, and the like are preliminarily assembled to the adapter D and the retainer 7 to form the seal mechanism S. The seal mechanism S is inserted into the casing 2, and the bolts are inserted from the outside of the casing 2. By screwing 21 to the retainer 7, the seal mechanism S and the casing 2 can be assembled together. At the time of the preliminary assembly, the pin member 19 in the connecting means 14 is screwed to the proximal adapter portion 12 conveniently and easily from the outside (outer diameter side) of the seal mechanism S through the mounting hole 18 of the distal adapter portion 13. There are advantages that can be manipulated

  An assembly in which the seal mechanism S and the casing 2 are integrated (that is, the stationary side seal portion K1 including the idle ring 5) is inserted into the sleeve 3A in the rotary base 3 equipped with the rotary ring 6, and rotated with the idle ring 5 A set plate (an example of a set member) 32 that engages with the rotary shaft 1 is fixed to the side surface of the casing 2 with bolts 33 while being pushed against the urging force of the coil spring 8 due to contact with the ring 6. As a result, the casing 2 with the seal mechanism S and the rotating base 3 are integrated in a state where the floating ring 5 is held between the rotating ring 6 and the stationary ring 4, so that the floating ring type mechanical seal A is integrated. It is formed. Then, the floating mechanical seal A is inserted into the rotary shaft 1, the sleeve 3 A is fixed to the rotary shaft 12 using the stop ring 27, and the casing 2 is pump casing using a plurality of mounting bolts 34 and nuts 35. As a result, the assembly of the floating mechanical seal A to the actual machine is completed. After completion of the assembly, the set plate 32 may be removed.

  In short, the floating ring type mechanical seal A according to the first embodiment includes a component group including the casing 2 and the stationary ring 4 belonging to the casing 2 (retainer 7, coil spring 8, adapter D, and O-rings 9, 10, 17, 24, screws). 15, a stationary side seal portion K1 composed of pin members p1, p2, etc., a component group (pumping ring 3B, O-ring) including a sleeve 3A that can be externally fitted and fixed to the rotary shaft 1 and a rotary ring 6 belonging thereto. 29, a reinforcing ring 30, a set screw 31 and the like, and a rotary side seal portion K2 between the stationary ring 4 and the rotary ring 6 by a set member 32 that is detachably provided across the seal portions K1 and K2. It is configured as a cartridge type in which the idler ring 5 is integrally connected with the floating ring 5 held between them.

  In general, the attachment of a floating ring type mechanical seal (fixed type) to a casing to be sealed such as a pump casing and a rotating shaft includes a number of components including a floating ring for constituting a stationary side sealing portion and a rotating side seal portion. Are individually incorporated in a certain procedure. The positional relationship among these many structural members is an important factor that determines the function as a floating ring type mechanical seal, and each structural member is assembled while making the positional relationship between the related members appropriate. There is a need. Therefore, assembling a large number of components into a rotating device while maintaining an appropriate positional relationship is a difficult task requiring careful and dexterity. Inconveniences are likely to occur, and there was a tendency for skilled workers to be required for quick assembly. Similarly, a skilled person is required to perform maintenance such as removal and reassembly from the rotating device.

  However, by configuring the idle ring type mechanical seal in the above-described cartridge type, the idle ring type mechanical seal is used in a state where the stationary side seal portion K1 and the rotation side seal portion K2 are assembled in advance using the set member. Since it can be pre-assembled in the same state as the form, even an unskilled person or a beginner can easily and properly perform the assembly work on the rotating equipment. Maintenance work such as assembly is also simplified. This is a great advantage in adopting a floating ring type mechanical seal that requires a large number of parts and requires difficult assembly.

  Here, the material of the main components of the floating ring type mechanical seal A according to Example 1 will be described. The parts of the casing 2, the rotating base 3, the stationary ring 4, the adapter D, and the retainer 7 are made of stainless steel. The idle ring 5 is made of carbon. The rotating ring 6 is made of titanium or SiC. The backup ring 20 is made of a fluororesin.

  If the above-mentioned r and h in the connecting means 14 are too small, they cannot follow the distortion, and if they are too large, they will rattle and easily cause wear and noise. Therefore, 0.3 mm ≦ r ≦ 1.0 mm, 0.3 mm ≦ h It may be defined as ≦ 1.0 mm. Moreover, as a connection means, it is possible to take various structures, such as providing the rod-shaped member penetrated through elastic members, such as rubber | gum, in the adapter part of both a base end side and a front end side, FIG. The structure is not limited.

  The adapter according to the present invention has a structure in which the rotating ring 6 is pressed and held by the elastic mechanism in the direction of the rotation axis P with respect to the rotating base 3 to hold the floating ring between the seal ring and the stationary ring. That is, the present invention may be applied to the above-described “rotary type” floating ring type mechanical seal.

Sectional drawing which shows whole structure of idle ring type mechanical seal Enlarged sectional view showing the main parts of the idle ring type mechanical seal Exploded view of adapter

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Seal casing 3A Sleeve 4 Stationary ring 5 Floating ring 6 Rotating ring 12 Base end side adapter part 12A 1st end part 13 Front end side adapter part 13A 2nd end part 14 Connection means 17 Seal ring 18 Mounting hole 19 Pin member 32 Set member A Free ring type mechanical seal D Adapter K1 Static side seal part K2 Rotation side seal part

Claims (4)

The floating ring is held between the rotating ring that rotates integrally with the rotating shaft and the stationary ring that is relatively fixed to the casing, one end is supported by the casing, and the other end is supported by the floating ring. An idle ring type mechanical seal equipped with a cylindrical adapter that supports and fits in the interior,
The adapter includes a cylindrical proximal end adapter portion supported by the casing, a cylindrical distal end adapter portion that supports and fits the floating ring, and the adapter portions are connected to each other in the front-rear, left-right, and upper-lower directions. and a connecting means for relatively movably coupled within a predetermined range in either direction, the coupling means includes a first end portion of the proximal-side adapter portion, the radial gap to the first end The second end portion of the distal end side adapter portion having a second end portion that can be fitted externally or internally, and either one of the first end portion and the second end portion. And a pin member that can be inserted into the mounting hole formed on the other side, and the diameter of the portion of the pin member that is inserted into the mounting hole is smaller than the diameter of the mounting hole . Annular mechanical seal. It said pin member, the floating ring type mechanical seal according to claim 1 which is screwed into an end portion located on the inner diameter side of the first end and the second end. The idler type mechanical seal according to any one of claims 1 and 2 , wherein the distal end side adapter portion is fitted into the casing via a seal ring so as to be relatively movable. A stationary side seal portion comprising a casing, a stationary member group including the stationary ring and the adapter belonging to the casing, a sleeve which can be fitted and fixed to the rotating shaft, and a structural member group including the rotating ring belonging thereto. The rotating side seal portion is integrally connected in a state where the idle ring is held between the stationary ring and the rotating ring by a set member that is detachably provided across both the seal portions. The floating ring type mechanical seal as described in any one of Claims 1-3 comprised by the cartridge type thing which is.

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