JP2020190312A - Rotation preventive mechanism - Google Patents

Abstract

To provide a rotation preventive mechanism for a slide component developing high durability by suppressing the occurrence of wear and breakage.SOLUTION: The rotation preventive mechanism includes a recessed part 6d formed in the back face of a rotational slide ring 4 or a stationary slide ring 6, or a locking body for locking these slide rings, and a rotation preventive part including a fitted part 91 fitted into the recessed part 6d. In an inner face 6e of the recessed part 6d or in outer faces 91a-91c of the fitted part 91, holes 93 are provided passing through the recessed part 6d or the fitted part 91.SELECTED DRAWING: Figure 4

Description

The present invention relates to a detent mechanism applied to a sliding component such as a mechanical seal that seals a rotating shaft.

The sliding component is used by being mounted between the housing of the fluid device and the rotating shaft arranged so as to penetrate the housing, and is fixed to a stationary side element composed of the housing or the like. The sliding surface of the sliding ring and the sliding surface of the rotating sliding ring that rotates together with the rotating side element such as the rotating shaft are brought into sliding contact with each other in the circumferential direction to prevent leakage of the sealed fluid.

In such a sliding component, a drive pin projecting in the axial direction from a rotating side element such as a collar fixed to the rotating shaft is fitted into a recess formed on the back surface of the rotating sliding ring. The rotating sliding ring is prevented from rotating with respect to the element on the rotating side, and has a structure that rotates together with the rotating shaft. Similarly, a knock pin projecting from a stationary side element such as a housing is fitted into a recess on the back surface of the stationary sliding ring, so that the stationary sliding ring is prevented from rotating with respect to the stationary element and maintains a stationary state. It has a structure. That is, the detent mechanism composed of the recesses on the back surface of these sliding rings and the fitting portions of the detent members such as drive pins and knock pins fitted in the recesses slides with each other via the sliding surface. It functions to regulate the rotation of the sliding ring by receiving the sliding torque of the driving ring (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2017-207147 (Page 2, Fig. 1)

However, in the detent mechanism applied to such sliding parts, due to the rotational sliding between the sliding rings, it occurs at the contact point between the inner surface of the recess on the back surface side of the sliding ring and the outer surface of the fitting portion. Due to the vibration and the like, the fitting portion and the recess are liable to be worn or damaged, and the durability of the detent mechanism is poor.

The present invention has been made in view of such problems, and an object of the present invention is to provide a detent mechanism for sliding parts having high durability by suppressing the occurrence of wear and breakage.

In order to solve the above problems, the detent mechanism of the present invention is used.
The rotating sliding ring is used for a sliding component in which a rotating sliding ring that rotates in the circumferential direction together with a rotating side element attached to the rotating shaft and a stationary sliding ring fixed to the stationary side element slide relative to each other. A detent mechanism that detents the rotating side element or detents the resting sliding ring from the resting side element.
The detent mechanism is composed of a recess and an fitting portion to be fitted into the recess, and is provided with a hole penetrating the inner surface of the recess or a hole penetrating the outer surface of the fitting portion. There is.
According to this, a fluid film is formed between the outer surface of the fitting portion and the inner surface of the recess by introducing the surrounding fluid through the recess or the hole penetrating the inside of the fitting portion fitted in the recess. Since it can be generated, the contact portion between the fitting portion and the recess can be brought into a good lubrication state by this fluid film, and the occurrence of wear and breakage of the detent mechanism can be suppressed.

The hole portion is formed through the contact region between the outer surface of the fitting portion and the inner surface of the recess, and the non-contact region excluding the contact region.
According to this, it is easy to introduce the fluid from the non-contact region between the inner surface of the recess and the outer surface of the fitting portion toward the contact region, and a fluid film can be reliably formed in this contact region.

An opening of the hole is formed on the entire surface of the fitting portion.
According to this, the fluid can be surely introduced into the contact region between the inner surface of the recess and the outer surface of the fitting portion.

The hole is formed through a single opening and a plurality of openings other than the opening so as to communicate with each other.
According to this, it is easy to introduce the fluid from the plurality of openings, the fluid film can be surely obtained, and the fluid introduced into the pores is dispersed and discharged to the plurality of openings, so that the fluid can be introduced in a wider area. A membrane can be obtained.

A plurality of the holes are provided independently of each other.
According to this, the lubricity in the recess can be improved.

The plurality of holes are separated at the same pitch.
According to this, a homogeneous fluid film can be formed in the recess.

The plurality of holes are provided with the same hole diameter.
According to this, a homogeneous fluid film can be formed in the recess.

It is sectional drawing which shows the structure of the mechanical seal of the Example of this invention. It is sectional drawing of AA of FIG. It is a figure which shows the mode in which the sealed fluid and the barrier liquid are filled in the mechanical seal of Example 1. It is a perspective view which shows the fitting mode of the detent mechanism of Example 1, and shows the mode in which a fluid film is formed. (A) is a cross-sectional view of a main part showing a hole formed in a protruding portion of the case, and (b) is a view of the case and the protruding portion as viewed from the coil spring side. It is a perspective view which conceptually shows the movement of the fluid in the detent mechanism of Example 1. FIG. It is a perspective view which shows the fitting mode of the detent mechanism in the modification 1 of the first embodiment. It is a perspective view which shows the fitting mode of the detent mechanism in Example 2. FIG. It is a perspective view which shows the fitting mode of the detent mechanism of Example 3. FIG.

A mode for carrying out the detent mechanism according to the present invention will be described below based on examples.

The detent mechanism for mechanical sealing according to the first embodiment will be described with reference to FIGS. 1 to 7. Hereinafter, the right side of the paper surface of FIG. 1 will be described as the outside of the machine, which is the atmospheric region, and the left side of the paper surface will be described as the inside of the machine.

As shown in FIG. 1, the mechanical seal 1 as a sliding component of the first embodiment includes a rotary seal ring 4 as a rotary sliding ring that rotates together with a rotary shaft 2, and a coil spring arranged on the seal cover 10. It is a static mechanical seal 1 including a static sealing ring 6 as a static sliding ring pressed by a retainer 18 urged by 8. Further, the mechanical seal 1 of this embodiment is fixed to the rotary shaft 2 with an annular static sealing ring 6 or 6'that is prevented from rotating with respect to the seal cover 10 on the outside of the machine and the seal cover 10'on the inside of the machine. The rotary sealing rings 4 and 4'that are prevented from rotating with respect to the sleeve 3 are tandem type mechanical seals 1 that are arranged so as to face the same direction in the axial direction. The mechanical seal 1 is stationary having a static sealing ring 6, 6'which is detented to an annular case 9 fixed to the seal covers 10, 10'via knock pins 7, 7'as detent pins. It is mainly composed of a side element S and a rotating side element R having a rotating sealing ring 4, 4'that rotates together with the rotating shaft 2.

The rotating side element R and the stationary side element S will be described in more detail with reference to FIG. As shown in FIG. 1, the rotating side element R includes a sleeve 3 fixed to the rotating shaft 2, rotating ring holding members 20, 20'fixed to the sleeve 3, and the rotating ring holding member 20. , 20', drive pins 5, 5'as detent pins extending substantially horizontally to the outside of the machine, and rotational force transmitted from the rotation shaft 2 via the drive pins 5, 5'rotate in the circumferential direction. It is mainly composed of an annular rotary sealing ring 4, 4'.

The stationary side elements S are arranged so that the seal covers 10 and 10'are adjacent to each other in the axial direction, and the connecting bolts 11 are inserted through the seal covers 10 and 10'in the axial direction and fixed to the device main body M. Further, the seal covers 10 and 10'are statically sealed by sliding contact with the coil springs 8 and 8'that urge the retainers 18 and 18' from the back side in the axial direction and the rotary sealing rings 4 and 4'. Knock pins 7, 7'to prevent the rings 6, 6'from rotating are attached. The knock pins 7, 7'are engaged in the axial direction from the back side of the cases 9, 9', and the cases 9, 9'are in the seal covers 10, 10', and the static sealing ring 6 is provided. , 6'is fitted inward on the outer diameter side.

Further, as shown in FIG. 1, the seal cover 10 has a barrier liquid inflow port 19 and a quenching liquid inflow port 49 formed in the radial direction, and the seal cover 10'has a flushing liquid formed in the radial direction. It has an inflow port 39 and a barrier liquid outflow port 29. The barrier liquid B flowing in from the barrier liquid inflow port 19 passes through the communication passage L1 communicating in the radial direction by the case 9, flows into the space Z described later, and flows from the space Z to the barrier liquid outflow port 29. It has become like. Further, the fluid pressure of the barrier liquid B is controlled so as to be higher than that of the sealed fluid H. Since the mechanical seal 1 of this embodiment is a tandem type as described above and has a configuration similarly arranged in the axial direction, the following are the static sealing ring 6 and the rotary sealing ring 4 on the outside of the machine. The configuration will be described, and the description of the internal configuration will be omitted.

As shown in FIG. 1, the seal cover 10 is formed in an axially axially annular shape, and a plurality of coil springs 8 are evenly arranged in the circumferential direction so as to urge the retainer 18 in the axial direction. ing. By arranging the coil springs 8 in a plurality of equal arrangements in this way, the retainer 18 transmits the urging force toward the rotary sealing ring 4 in the axial direction with the uniform surface pressure on the back surface 6a of the static sealing ring 6. It is configured to do. Further, the seal cover 10 is similarly formed with holes 10a on the outer peripheral side of the coil springs 8 evenly arranged in the circumferential direction, and the knock pins 7 described later are formed in the holes 10a. The press-fitting portion 27 of the above is press-fitted and fixed.

Next, the case 9 will be described in detail. As shown in FIG. 2, the case 9 has a tubular portion 90 formed in the shape of an axially-viewing ring and a columnar fitting portion protruding from the tubular portion 90 toward the inner diameter side and extending in the axial direction. It is mainly formed from the protruding portion 91 of the above and the communication passage L1 through which the tubular portion 90 is formed through in the radial direction. The protruding portion 91 is arranged in the same phase as the communication passage L1, that is, at a position facing the circumferential direction and the radial direction. As shown in FIGS. 4 to 6, the projecting portions 91 include side wall portions 91a and 91a facing in the circumferential direction, inner surface portions 91b facing in the inner diameter direction, outer surface portions 91c facing in the outer diameter direction, and axial directions. It is formed in a prismatic shape composed of end face portions 91d facing the side surface, and the side wall portions 91a, 91a, the inner surface portion 91b, the outer surface portion 91c, and the end face portion 91d have a plurality of openings 94 constituting the hole portion 93. Is formed. Specifically, the openings 94 are separated from each other at the same pitch in the circumferential direction, the radial direction, and the axial direction of the case 9, and are on the entire surfaces of the side wall portions 91a, 91a, the inner surface portion 91b, the outer surface portion 91c, and the end surface portion 91d, respectively. Independently, a plurality of them are formed in a matrix-like orderly arranged side by side. The hole portion 93 penetrates from one side wall portion 91a to the other side wall portion 91a and is formed in parallel with each other, and a passage formed in the radial direction through the inner surface portion 91b and the outer surface portion 91c. The 95B and the passage 95C formed in the axial direction of the protrusion 91 communicate with each other inside the protrusion 91, and the side wall portions 91a, 91a and the inner surface portion 91b in the outer diameter direction communicating with the passages 95A, 95B, 95C, respectively. The outer surface portion 91c facing the surface and all the openings 94 formed on the entire surface of the end surface portion 91d are configured to communicate with each other. Although these passages 95A, 95B, and 95C are formed to have the same inner diameter, the passages are not limited to this, and passages in a direction in which high flowability is desired may be formed to have a large diameter. Further, a rectangular recess 6d is formed on the outer peripheral surface 6c of the static sealing ring 6 in the axial direction, and the protrusion 91 of the case 9 described above is formed in a large shape so as to be loosely fitted. .. As a result, the protruding portion 91 of the case 9 is fitted into the recess 6d of the static sealing ring 6 from the circumferential direction, and the stationary sealing ring 6 which is slidably contacted with the rotary sealing ring 4 is prevented from rotating. Can be done. That is, a detent mechanism is formed by the recess 6d and the protrusion 91.

Next, with reference to FIG. 3, a region occupied by the sealed fluid H, the barrier liquid B as the sealed liquid, and the air A on the leak side during the operation of the mechanical seal 1 of this embodiment will be described. As shown in FIG. 3, the fluid H to be sealed is sealed by the sliding portion E'between the rotary sealing ring 4'and the static sealing ring 6'on the left side of the paper surface inside the machine. Atmosphere A is partitioned by a sliding portion E of a rotary sealing ring 4 and a static sealing ring 6 on the right side of the paper surface on the outside of the machine. Further, in the space Z formed between the sliding portion E'between the rotary sealing ring 4'and the static sealing ring 6'and the sliding portion E between the rotary sealing ring 4 and the static sealing ring 6, The barrier liquid B flowing in from the barrier liquid inflow port 19 is sealed.

Further, the barrier liquid B flowing in from the barrier liquid inflow port 19 has a sliding portion E between the rotary sealing ring 4 and the static sealing ring 6 and a sliding portion E between the rotary sealing ring 4'and the static sealing ring 6'. The space Z formed from the'and the seal covers 10 and 10'is filled and flows out from the barrier liquid outlet 29. Further, since the barrier liquid B is controlled to have a higher pressure than the sealed fluid H, the sealed fluid H flows into the space Z side even if an abnormality occurs due to a sliding defect of the sliding portion E'. It is configured to keep things down.

With reference to FIG. 4, the fitting mode of the case 9 and the static sealing ring 6 when the mechanical seal 1 of this embodiment is in operation will be described in detail. When the rotary sealing ring 4 facing the static sealing ring 6 urged by the coil spring 8 via the retainer 18 (see FIG. 1) rotates in the circumferential direction, it is loosely fitted in the recess 6d of the static sealing ring 6. The side wall portion 91a of the fitted protruding portion 91 abuts on one inner wall surface 6e of the recess 6d in a circumferential direction, thereby restricting the rotation of the static sealing ring 6. Since the side wall portions 91a, 91a, the inner surface portion 91b, the outer surface portion 91c, and the end surface portion 91d of the projecting portion 91 of the case 9 are formed with a plurality of openings 94 forming the hole portion 93, a plurality of openings 94 forming the hole portion 93 are formed in the space Z. The inflowing barrier liquid B is introduced into the recess 6d through the hole 93. For the case 9'and the static sealing ring 6', the sealed fluid H is introduced into the recess 6d'.

The barrier liquid B introduced into the recess 6d through the hole 93 is between the side wall 91a and the recess 6d on the outer peripheral surface 6c of the static sealing ring 6, more specifically, the side wall 91a of the protrusion 91 and the side wall 91a. The fluid film F is formed at the contact point with the inner wall surface 6e of the recess 6d that comes into contact with the side wall portion 91a in a pressed state. The fluid film F is formed over the entire surface of the above-mentioned contact portion by guiding the barrier liquid B to the side wall portion 91a through the hole portion 93 of the protrusion portion 91. The fluid film F generated between the side wall portion 91a of the protruding portion 91 and the inner wall surface 6e of the recess 6d of the static sealing ring 6 keeps the contact portion between the protruding portion 91 and the recess 6d in a good lubrication state. It is possible to suppress the occurrence of wear and breakage of the detent mechanism.

As shown in FIG. 4, the hole 93 is a contact region between one side wall 91a, which is the outer surface of the projecting portion 91, and the inner wall surface 6e, which is the inner surface of the recess 6d that abuts on the side wall 91a in a pressed state. Since S1 and the other side wall portion 91a, the inner surface portion 91b, the outer surface portion 91c, and the end surface portion 91d, which are the non-contact region S2 excluding the contact region S1, are formed through, the other side wall portion which is the non-contact region S2. The barrier liquid B introduced from the 91a, the inner surface portion 91b, the outer surface portion 91c, and the end surface portion 91d is led out toward the contact region S1 of one side wall portion 91a through the passages 95A, 95B, 95C inside the protruding portion 91. The fluid film F can be reliably formed in the contact region S1.

Further, since the hole 93 of the side wall 91a in the protrusion 91 is formed on the entire surface of the protrusion 91, a barrier is formed in the contact region S1 between the inner wall surface 6e of the recess 6d and one side wall 91a of the protrusion 91. The barrier liquid B that has flowed in from the liquid flow inlet 19 through the communication passage L1 can be reliably introduced. Therefore, the barrier liquid B can be introduced to the inner part of the recess 6d in the axial direction or the radial direction to obtain the fluid film F in a wider area, and the coil spring 8 not only allows the static sealing ring 6 to move in the axial direction. It is designed so that it does not get caught.

Further, since the passages 95A, 95B, and 95C communicate with each other, all the openings 94 formed on the entire surfaces of the side wall portions 91a, 91a, the bottom portion 91b, and the end face portion 91c communicate with each other, so that the plurality of openings 94 The barrier liquid B can be easily introduced from the above, and the fluid film F can be surely obtained. Further, by dispersing and discharging the barrier liquid B introduced into the pores 93 into the plurality of openings 94, the fluid film can be spread over a wider area. F can be obtained.

Further, the hole portion 93 is formed through the contact region S1 between the inner wall surface 6e of the recess 6d and one side wall portion 91a of the protrusion 91 and the non-contact region S2 excluding the contact region S1. In FIG. 6, the opening 94 located in the contact region S1 between the inner wall surface 6e of the recess 6d and one side wall portion 91a of the protrusion 91, and the one side wall portion 91a of the inner wall surface 6e of the recess 6d and the protrusion 91. A portion that does not overlap in the axial direction, that is, an opening 94 located in the non-contact region S2, communicates with the passages 95A and 95C inside the protrusion 91. According to this, the barrier liquid B can be easily introduced from the non-contact region S2 toward the contact region S1 between the inner wall surface 6e of the recess 6d and the one side wall portion 91a of the protrusion 91, and the fluid film F can be easily introduced into the contact region S1. Can be reliably generated.

In the first embodiment, the opening 94 of the hole 93 is not limited to the configuration formed on the entire surfaces of the side wall portions 91a and 91a, the bottom portion 91b and the end face portion 91c, and one of the side wall portions 91a and the protruding portion 91. It may be formed on any outer surface except for the side wall portion 91a of the above.

Further, the passage 94 inside the hole 93 does not have to have an even grid pattern as shown in FIGS. 5A and 5B as long as all the openings 94 can communicate with each other. For example, the passages 95A, 95B and 95C May not be parallel to each other, and the dimensions formed by each may not be uniform.

Further, in the first embodiment, the same number of openings 94 are formed in one side wall portion 91a and the other side wall portion 91a, but the present invention is not limited to this, and for example, they are formed on the outer surface of one of the protruding portions 91. The one-point opening 94 may be configured to branch into two or more openings 94 formed on the other outer surface by a passage having a branch path in the middle in the longitudinal direction.

Further, the passage 95C formed at a predetermined depth in the axial direction of the protruding portion 91 is formed regardless of the depth dimension as long as it communicates with a passage communicating with another outer surface, for example, in the axial direction of the protruding portion 91. The passage 95C formed at a predetermined depth may be formed so as to form an opening in the axial end surface of the case 9 beyond the portion constituting the protrusion 91.

Further, for example, the passage 95B formed in the radial direction of the protruding portion 91 is penetrated to the outer peripheral surface of the case 9 beyond the portion constituting the protruding portion 91, and the opening penetrated on the outer diameter side serves as a continuous passage L1. The configuration of the communication passage L1 may be omitted.

Here, as shown in FIG. 7, as a modification of the hole portion, instead of forming the hole portion in the protruding portion 91, the inner wall surface 6e and the outer peripheral surface 6f of the recess 6d of the static sealing ring 6 are used. Holes 96 may be formed through the openings 97 formed on both end surface portions 6h in the axial direction. For example, by forming the static sealing ring 6 with a porous material, a hole portion may be formed so as to penetrate the inner wall surface 6e and the outer peripheral surface 6f of the recess 6d of the static sealing ring 6.

Next, the detent mechanism for mechanical sealing according to the second embodiment will be described with reference to FIG. The same components as those shown in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

The detent mechanism for mechanical sealing in the second embodiment will be described. As shown in FIG. 8, in this embodiment, the retainer 18 is omitted and the coil spring 8 is urged in contact with the back surface of the static sealing ring 6 in the radial direction to the back surface 6a of the static sealing ring 6. The notched notch 6b is formed, and the horizontally extending knock pin 7 press-fitted into the hole 10b formed on the side surface of the seal cover 10 is fitted into the notch 6b to form the static sealing ring 6. This is intended to regulate the rotation due to sliding with the rotary sealing ring 4.

As shown in FIG. 8, the knock pin 7 is formed in a substantially columnar shape, has a diameter substantially the same as the hole portion 10b of the seal cover 10, and is a press-fitting portion as a fixing portion that can be press-fitted and fixed in the hole portion 10b. It is mainly composed of 27 and a fitting portion 17 having a diameter larger than that of the press-fitting portion 27 and projecting substantially horizontally from the seal cover 10.

Further, the fitting portion 17 of the knock pin 7 is fitted in the notch portion 6b as a recess formed on the back surface 6a side of the static sealing ring 6 in a loosely fitted state in the axial direction so as to correspond to the arrangement of the knock pin 7. The static sealing ring 6 is allowed to move in the axial direction while restricting the movement in the circumferential direction due to sliding with the rotary sealing ring 4. The notch portion 6b is formed to have a larger diameter and an axially longer length than the fitting portion 17 of the knock pin 7.

The fitting portion 17 is an angle composed of side wall portions 17a and 17a facing in the circumferential direction, inner surface portions 17b facing in the inner diameter direction, outer surface portions 17c facing in the outer diameter direction, and end surface portions 17d and 17d facing in the axial direction. It is formed in a columnar shape, and a plurality of openings 99 forming the hole 98 are formed in the side wall portions 17a and 17a, the inner surface portions 17b, the outer surface portions 17c, and the end surface portions 17d and 17d. Specifically, a plurality of openings 99 are independently formed on each surface. The hole 98 is formed in a plurality of passages communicating inside the fitting portion 17 and are formed on the entire surfaces of the side wall portions 17a, 17a, the inner surface portion 17b, the outer surface portion 17c, and the end surface portions 17d, 17d. 99 are configured to communicate with each other.

As described above, as described in the second embodiment, the barrier liquid B flowing in from the barrier liquid inflow port 19 is introduced into the notch portion 6b, and is stationary with one side wall portion 17a of the fitting portion 17 through the hole portion 98. Contact between the cutout portion 6b on the outer peripheral surface 6c of the sealing ring 6 and, more specifically, the side wall portion 17a of the fitting portion 17 and the inner wall surface 6e of the notch portion 6b that abuts on the side wall portion 17a in a pressed state. A fluid film F is formed in the region. The fluid film F is formed over the entire surface of the above-mentioned contact portion by leading the barrier liquid B to the side wall portion 17a side through the hole portion 98 of the fitting portion 17. The fluid film F generated between the side wall portion 17a of the fitting portion 17 and the inner wall surface 6e of the notch portion 6b of the static sealing ring 6 provides good lubrication of the contact portion between the fitting portion 17 and the notch portion 6b. In this state, it is possible to suppress the occurrence of wear and breakage of the detent mechanism.

The fluid can be reliably introduced into the contact region between the inner wall surface 6e of the notch portion 6b as the recess and the side wall portion 17a of the fitting portion 17.

Further, although not particularly shown, a hole similar to the knock pin 7 described above may be formed on the outer peripheral surface of the drive pin 5 that prevents the rotary sealing ring 4 from rotating with respect to the sleeve 3.

Next, the detent mechanism for mechanical sealing according to the third embodiment will be described with reference to FIG. The same components as those shown in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

The detent mechanism for mechanical sealing in the third embodiment will be described. As shown in FIG. 9, in the present embodiment, a plurality of hole portions 100 are provided independently of each other through the side wall portions 170a and 170a of the fitting portion 170 of the knock pin 70, and are notched. The lubricity in the portion 6b can be improved.

Further, since the plurality of holes 100 are separated from each other at the same pitch, a homogeneous fluid film F can be formed in the notch 6b.

Further, since the plurality of pores 100 are each provided with the same pore diameter, a homogeneous fluid film F can be generated in the notch 6b.

The plurality of holes 100 are not limited to a configuration in which all of them are independent, and some of the plurality of holes 100 may communicate with each other inside the fitting portion 17.

Although examples of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these examples, and any changes or additions within the scope of the gist of the present invention are included in the present invention. Is done.

For example, in the above embodiment, the fitting portion 17 of the knock pin 7 has been described as a prism, but the present invention is not limited to this, and a round prism or a hexagonal prism may be used.

Further, in the second embodiment, the hole 98 is formed in the knock pin 7, but the present invention is not limited to this, and the hole may be formed in the drive pin 5.

Further, in the above embodiment, the static sealing ring 6 or the rotary sealing ring 4 is formed with a recess constituting the detent mechanism, but the present invention is not limited to this. For example, the static sealing ring 6 is attached to the seal cover 10 for the mechanical seal. When a locking body for stopping or a locking body for locking the rotary sealing ring 4 to the sleeve 3 is configured, a recess may be formed in the locking body.

Further, in the above embodiment, the detent mechanism is applied to the tandem type mechanical seal 1, but the detent mechanism according to the present invention is not limited to this, even if it is applied to the single type and double type mechanical seals. Alternatively, it may be applied to sliding parts such as thrust bearings.

Further, as described in the modified example of the first embodiment, the matter of providing a hole in the inner wall surface of the recess can be applied to the second embodiment and the like.

1 Mechanical seal (sliding parts)
2 Rotating shaft 3 Sleeve 4, 4'Rotating sealing ring 5, 5'Drive pin 6, 6'Resting sealing ring 6a Back surface 6b Notch (recess)
6c Outer surface 6d Recess 6e Inner wall surface (inner surface)
7,7'Knock pin 8 Coil spring 9 Case 10 Seal cover 10a Hole 17 Fitting 17a Side wall 17b Inner surface 17c Outer surface 17d End face 19 Barrier liquid inlet 20 Rotating ring holding member 27 Press-fit 29 Barrier liquid outlet 91 Protruding part (fitting part)
91a Side wall (outer surface)
91b Inner surface (outer surface)
91c outer surface (outer surface)
91d End face (outer surface)
93 Hole 94 Opening 95A to C Passage 96 Hole 97 Opening 98 Hole 99 Open 100 Hole B Barrier liquid E Sliding part F Fluid film H Sealed fluid M Machine body L1 Continuous passage R Rotating side element S Resting side element Z space

Claims (7)

The rotating sliding ring is used for a sliding component in which a rotating sliding ring that rotates in the circumferential direction together with a rotating side element attached to the rotating shaft and a stationary sliding ring fixed to the stationary side element slide relative to each other. A detent mechanism that detents the rotating side element or detents the resting sliding ring from the resting side element.
The detent mechanism is composed of a recess and an fitting portion to be fitted into the recess, and is provided with a hole penetrating the inner surface of the recess or a hole penetrating the outer surface of the fitting portion. Anti-rotation mechanism. The detent mechanism according to claim 1, wherein the hole portion is formed through the contact region between the outer surface of the fitting portion and the inner surface of the recess, and the non-contact region excluding the contact region. The detent mechanism according to claim 1 or 2, wherein an opening of the hole is formed on the entire surface of the fitting portion. The detent mechanism according to any one of claims 1 to 3, wherein the hole is formed through a single opening and a plurality of openings other than the opening so as to communicate with each other. The detent mechanism according to claim 1 or 2, wherein a plurality of the holes are provided independently of each other. The detent mechanism according to claim 5, wherein the plurality of holes are separated by the same pitch. The detent mechanism according to claim 5 or 6, wherein the plurality of holes have the same hole diameter.

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