JP7190381B2 - sliding parts - Google Patents

Description

The present invention relates to a sliding part that rotates relative to each other, for example, a sliding part used in a shaft sealing device for sealing a rotating shaft of a rotating machine in the field of automobiles, general industrial machinery, or other sealing fields, or automobiles, general industrial machinery. , or other sliding parts used in bearings of machines in the field of bearings.

2. Description of the Related Art As a shaft sealing device for preventing leakage of a liquid to be sealed, for example, a mechanical seal has a pair of annular sliding parts whose sliding surfaces slide relative to each other. In recent years, it has been desired to reduce the energy lost due to sliding in such mechanical seals for environmental reasons. Some have positive pressure generating grooves closed at one end on the surface.

For example, the mechanical seal disclosed in Patent Document 1 has, on the sliding surface of one of the sliding parts, an introduction groove portion that extends in the radial direction and communicates with the liquid to be sealed, and an introduction groove portion that communicates with the introduction groove portion and extends in the relative rotation direction. A plurality of dynamic pressure generating mechanisms are arranged in parallel along the circumferential direction via lands. According to this, during the relative rotation of the sliding parts, the liquid to be sealed is introduced into the dynamic pressure generating groove through the introduction groove, and the liquid to be sealed is concentrated on the wall of the end of the dynamic pressure generating groove in the relative rotation direction. As a result, positive pressure is generated to separate the sliding surfaces, and a liquid film of the sealed liquid is formed on the sliding surfaces, thereby improving lubricity and realizing low friction.

Japanese Patent Application Laid-Open No. 5-60247 (page 3, FIG. 2)

As described above, in Patent Document 1, by supplying the sealed fluid from the end point of the dynamic pressure generating groove to between the sliding parts, it is possible to reduce the friction between the sliding parts. If the fluid contains contaminants, this contaminant stays in the introduction groove, enters the dynamic pressure generation groove through the introduction groove, and stagnate/accumulates in the vicinity of the closed end point of the dynamic pressure generation groove. There is a risk of being As a result, the contamination present between the sliding surfaces may damage the sliding surfaces and adversely affect the performance of the rotary machine. In the present application, "contamination" is an abbreviation of "contamination" and means "particulate foreign matter" such as multifine particulate conductive foreign matter.

The present invention has been made by paying attention to such problems, and is designed to suppress the entry of contamination into the dynamic pressure generating groove and to keep the lubricating performance and sealing function of the sliding surface in good condition. Intended to provide parts.

In order to solve the above problems, the sliding component of the present invention is
An annular sliding component arranged at a portion of a rotating machine that rotates relatively, wherein the sliding surface of the sliding component includes an introduction groove portion communicating with a sealed fluid side, and an introduction groove portion communicating with the fluid introduction groove portion. A plurality of dynamic pressure generating mechanisms each including a dynamic pressure generating groove extending in the circumferential direction in which the sliding parts relatively rotate are arranged in parallel in the circumferential direction,
A protrusion is provided in the introduction groove.
According to this feature, the protrusion in the introduction groove generates turbulence in the sealed fluid while ensuring the flow rate of the sealed fluid. Contaminants that try to enter the introduction groove are blocked by the projections and repelled to the outside or lose their fluidity, so that the risk of contamination entering the dynamic pressure generating groove through the introduction groove is prevented. Good lubrication performance and seal function can be maintained.

Preferably, the protrusions are a plurality of columnar bodies extending from the inner surface of the introduction groove.
According to this, contaminants can be reliably trapped by the plurality of columnar bodies, and the sealed fluid can flow into the introduction groove through the gaps between these columnar bodies.

Preferably, the protrusion is integrally formed of the same material as the base material forming the sliding surface.
According to this, it is possible to easily perform the molding process of the protrusion.

Preferably, the protrusions are made of the same ceramic as the base material forming the sliding surface.
According to this, high structural strength of the protrusion can be ensured.

Preferably, the protruding portion is arranged at a location near an opening communicating with the sealed fluid side of the introduction groove portion.
According to this configuration, by preventing entry of contaminants by the protrusions arranged near the opening of the introduction groove, it is easy to introduce the sealed fluid from which the contaminants have been removed into the dynamic pressure generation groove.

Preferably, the protrusion is provided at a position lower than the land of the sliding surface.
According to this, it is possible to avoid the risk of damage caused by contact between the projecting portion and the mating sliding component.

Preferably, the protrusions are provided in a zigzag pattern.
According to this, the efficiency of trapping contamination can be enhanced.

Preferably, the protrusion has an inclined surface that slopes toward the outside of the introduction groove.
According to this, the contaminants can be guided toward the outside of the introduction groove by the inclined surface of the protrusion.

Preferably, the introduction groove portions arranged in parallel along the circumferential direction are in communication with each other through an endlessly extending annular groove.
According to this, the fluidity of the sealed fluid in the introduction groove is increased, and the sealed fluid is easily supplied to the dynamic pressure generating groove, so that the efficiency of dynamic pressure generation can be improved.

Preferably, the introduction groove communicates with the sealed fluid side and the outer diameter side.
According to this, since the centrifugal force acts in the outer diameter direction, it is easy to remove contaminants that are about to enter.

1 is a longitudinal sectional view showing a mechanical seal in Example 1 of the present invention; FIG. It is the figure which looked at the sliding surface of the stationary seal ring from the axial direction. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; FIG. 4 is an enlarged view of a main portion of the sliding surface of the stationary seal ring; FIG. 4 is a perspective view showing a state of discharging contaminants mixed in the introduction groove. FIG. 5 is an explanatory diagram showing Modification 1 of Embodiment 1; FIG. 10 is an explanatory diagram showing Modification 2 of Embodiment 1; FIG. 11 is an explanatory diagram showing a modification 3 of the embodiment 1; It is the figure which looked at the sliding surface of the stationary seal ring in Example 2 of this invention from the axial direction. FIG. 11 is a view of the sliding surface of the stationary seal ring in Example 3 of the present invention as seen from the axial direction;

A mode for carrying out the sliding component according to the present invention will be described below based on an embodiment.

A sliding component according to Example 1 will be described with reference to FIGS. 1 to 8. FIG. In addition, in the present embodiment, a form in which the sliding part is a mechanical seal will be described as an example. In addition, the outer diameter side of the sliding part that constitutes the mechanical seal will be described as the sealed liquid side (high pressure side), and the inner diameter side as the atmosphere side (leakage side, low pressure side). However, the sealed liquid side may be the low pressure side, and the leak side may be the high pressure side. The sealed fluid is not limited to liquid but may be gas, for example, the atmosphere. Also, for convenience of explanation, dots may be added to grooves formed on the sliding surface in the drawings.

The mechanical seal for general industrial machinery shown in FIG. A rotating seal ring 20, which is an annular sliding member provided in a state that is integrally rotatable with the rotating shaft 1 via a sleeve 2, and a seal cover 5 fixed to the housing 4 of the equipment to be attached. and an annular stationary seal ring 10 as a sliding component provided in a rotating and axially movable state. , the sliding surface 11 of the stationary seal ring 10 and the sliding surface 21 of the rotary seal ring 20 are adapted to closely slide against each other. The sliding surface 21 of the rotary seal ring 20 may be a flat surface or may be provided with a recess.

The stationary seal ring 10 and the rotary seal ring 20 are typically formed of a combination of SiC (hard material) or SiC (hard material) and carbon (soft material). Any material that is used as a sliding material for mechanical seals can be applied. Examples of SiC include sintered bodies using boron, aluminum, carbon, etc. as sintering aids, and materials composed of two or more phases with different components and compositions, such as SiC and SiC in which graphite particles are dispersed. There are reaction-sintered SiC, SiC-TiC, SiC-TiN, etc. made of Si, and as the carbon, resin-molded carbon, sintered carbon, etc. can be used, as well as mixed carbonaceous and graphite carbon. Metal materials, resin materials, surface modification materials (coating materials), composite materials, etc. are also applicable in addition to the sliding materials described above.

As shown in FIG. 2, the rotary seal ring 20 slides relative to the stationary seal ring 10 as indicated by the arrows. Generating mechanisms 14 are evenly arranged in the circumferential direction of the stationary seal ring 10 . A portion of the sliding surface 11 other than the dynamic pressure generating mechanism 14, more specifically, a portion closer to the atmosphere than the dynamic pressure generating mechanism 14, a portion between the dynamic pressure generating mechanisms 14 adjacent in the circumferential direction, and the like have flat end surfaces. It becomes land 12 to form.

Next, the outline of the dynamic pressure generating mechanism 14 will be described with reference to FIGS. 2 to 4. FIG. Hereinafter, when the stationary seal ring 10 and the rotary seal ring 20 rotate relatively, the left side of the paper surface of FIG. is the upstream side of the sealed liquid F flowing in the Rayleigh step 9A.

The dynamic pressure generating mechanism 14 includes an introduction groove portion 15 having an opening portion 15a communicating with the sealed liquid F side and extending toward the atmosphere side, and a stationary seal ring 10 extending downstream from the end portion of the introduction groove portion 15 toward the atmosphere side. and a Rayleigh step 9A as a hydrodynamic groove extending in the circumferential direction. The introduction groove portion 15 is closed at the inner diameter side end portion, and the inner diameter side end face thereof is continuous with the inner diameter side end face of the Rayleigh step 9A. That is, the dynamic pressure generating mechanism 14 has a substantially L shape when viewed from a direction orthogonal to the sliding surface 11 due to the introduction groove portion 15 and the Rayleigh step 9A. By connecting a plurality of introduction groove portions 15 arranged in parallel along the circumferential direction with each other through an endlessly extending annular groove (not shown), the fluidity of the sealed liquid F in the introduction groove portion 15 is enhanced. , the sealed liquid F may be easily supplied to the Rayleigh step 9A to improve the efficiency of dynamic pressure generation.

The introduction groove portion 15 includes an inlet portion 15b located closer to the opening portion 15a and closer to the liquid to be sealed than the Rayleigh step 9A, and a deep portion 15c communicating with the inlet portion 15b in the radial direction and located on the Rayleigh step 9A side. , is composed of At the entrance portion 15b, a protrusion 13A, which is a trap portion for preventing contamination C (see FIG. 5) from entering the introduction groove portion 15, is arranged. It does not hinder the flow of the liquid to be sealed F that enters. The projecting portion 13A is a group of projecting pieces 13a, 13a, . integrally molded. Here, the staggered arrangement means that a plurality of protruding pieces 13a are arranged along the circumferential direction in the front row near the opening 15a, and a plurality of protruding pieces 13a are arranged in the rear row at different positions in the circumferential direction from the front row of the protruding pieces 13a. It means that the projecting piece 13a is arranged. In addition, although the projection piece 13a has a prismatic shape in FIG. 5, it is not limited to this. good too.

Further, the Rayleigh step 9A is formed with a wall portion 9a perpendicular to the rotation direction at the downstream end portion. In addition, the wall portion 9a is not limited to being perpendicular to the rotation direction, and may be inclined with respect to the rotation direction, or may be formed in a stepped shape.

Further, the depth dimension L10 of the introduction groove portion 15 is deeper than the depth dimension L20 of the Rayleigh step 9A (L10>L20). Specifically, the depth L10 of the introduction groove portion 15 in Example 1 is set to 100 μm, and the depth L20 of the Rayleigh step 9A is set to 5 μm. That is, between the introduction groove portion 15 and the Rayleigh step 9A, a step 18b in the depth direction is formed by the downstream side surface of the introduction groove portion 15 and the bottom surface of the Rayleigh step 9A. If the depth dimension of the introduction groove portion 15 is formed deeper than the depth dimension of the Rayleigh step 9A, the depth dimensions of the introduction groove portion 15 and the Rayleigh step 9A can be freely changed. 5 times or more. Furthermore, the protrusion 13A may be provided at a position lower than the sliding surface 11, thereby avoiding the possibility of the protrusion 13A coming into contact with the rotary seal ring 20 and being damaged.

Although the bottom surface of the Rayleigh step 9A is flat and parallel to the land 12, the flat surface may be provided with fine recesses or may be inclined with respect to the land 12. FIG. Furthermore, the two arcuate surfaces extending in the circumferential direction of the Rayleigh step 9A are perpendicular to the bottom surface of the Rayleigh step 9A. The bottom surface of the introduction groove portion 15 is formed parallel to the land 12 and has a uniform depth except for the protrusion 13A. do not prevent the formation of For example, the bottom surface of the introduction groove portion 15 may be tapered or stepped so as to become shallower from the opening 15a on the side of the liquid to be sealed toward the Rayleigh step 9A on the side of the atmosphere. Furthermore, the two planes extending to the opening 15a of the introduction groove 15 are perpendicular to the bottom surface of the introduction groove 15, respectively.

Next, the operation during relative rotation between the stationary seal ring 10 and the rotary seal ring 20 will be described. First, when the general industrial machine is not in operation and the rotary seal ring 20 is not rotating, the amount of the sealed liquid F on the side of the liquid to be sealed between the sliding surfaces 11 and 21 is small due to capillary action. , and the dynamic pressure generating mechanism 14 is filled with the sealed liquid F that has flowed in from the sealed liquid side through the opening 15 a of the introduction groove 15 . Since the sealed liquid F has a higher viscosity than gas, the amount of the sealed liquid F that leaks from the dynamic pressure generating mechanism 14 to the atmosphere when the general industrial machine is stopped is small.

When the dynamic pressure generating mechanism 14 is filled with the sealed liquid F when the general industrial machine is stopped, the rotary seal ring 20 rotates relative to the stationary seal ring 10 (see the black arrow in FIG. 2). 4, the to-be-sealed liquid F on the side of the to-be-sealed liquid is introduced from the introduction groove portion 15 as indicated by the arrow H1, and the Rayleigh step 9A causes the to-be-sealed liquid F to move in the rotational direction of the rotary seal ring 20 as indicated by the arrow H1. As indicated by H2, the following movement occurs, so dynamic pressure is generated within the Rayleigh step 9A. Incidentally, the pressure gradually decreases toward the upstream side of the Rayleigh step 9A.

The pressure is highest in the vicinity of the wall portion 9a, which is the downstream end portion of the Rayleigh step 9A, and the sliding surfaces 11 and 21 are separated from each other, and a liquid film of the sealed liquid F is formed on the sliding surface 11. The sealing liquid F flows out from the vicinity of the wall portion 9a to its surroundings as indicated by an arrow H3. According to this, a liquid film of the sealed liquid F is formed near the walls 9a, 9a, . . . of the Rayleigh steps 9A, 9A, . This improves lubricity and reduces friction. At this time, as described above, the downstream side of the Rayleigh step 9A is particularly high pressure, so the sealed liquid F in the vicinity of the Rayleigh step 9A does not substantially enter the Rayleigh step 9A as indicated by the arrow H4.

Next, the operation of suppressing the contaminants C that are about to enter the introduction groove portion 15 will be described. As shown in FIG. 5, when the rotary seal ring 20 rotates relative to the stationary seal ring 10 while the dynamic pressure generating mechanism 14 is filled with the liquid to be sealed F, inertia due to this relative rotation causes the liquid to be sealed. Contaminants C also try to enter the introduction groove portion 15 along with the sealed liquid F on the side. At this time, the contaminants C are repelled by the projecting portion 13 A arranged near the opening 15 a of the introduction groove portion 15 and can be discharged to the outside of the introduction groove portion 15 . In addition, a small portion of the contaminants C that were not repelled by the protrusions 13A near the opening 15a are trapped by the plurality of protrusions 13a, 13a, . . . C can be kept on the protrusion 13A, and can be prevented from entering the deep portion 15c of the introduction groove portion 15. As shown in FIG.

As described above, the introduction groove portion 15 is provided with the projection portion 13</b>A that suppresses the entry of the contaminant C into the introduction groove portion 15 . Therefore, the protrusion 13A provided in the introduction groove 15 generates turbulence of the fluid F while ensuring the flow rate of the liquid F to be sealed. Contaminant C that tries to enter the introduction groove portion 15 along with the sealed liquid F due to inertia during rotation is blocked by the projection 13A and is repelled to the outside or loses its fluidity. The danger of entering the Rayleigh step 9A can be prevented, and the lubricating performance and sealing function of the sliding surfaces 11 and 21 can be maintained satisfactorily.

Further, since the projecting portion 13A is a plurality of columnar bodies extending from the inner surface of the introduction groove portion 15, the contaminant C is reliably trapped by the plurality of columnar bodies, and the liquid to be sealed is discharged from the gaps between these columnar bodies. F can flow into the introduction groove portion 15 . Incidentally, the projecting portion 13A is not necessarily limited to extending from the bottom surface of the introduction groove portion 15, and may extend from the inner side surface of the introduction groove portion 15, for example.

In addition, since the protrusion 13A is integrally molded with the same material as the base material forming the sliding surface 11, the protrusion 13A can be easily formed.

In addition, since the protrusion 13A is formed of the same ceramic as the base material forming the sliding surface 11, high structural strength of the protrusion 13A can be ensured.

In addition, since the projection 13A is arranged near the opening 15a communicating with the sealed liquid side of the introduction groove 15, the projection 13A arranged near the opening 15a of the introduction groove 15 prevents the contamination C. By preventing the entry of , it is easy to introduce the sealed liquid F from which the contamination C has been removed into the Rayleigh step 9A.

Moreover, since the protrusion 13A is provided at a position lower than the land 12 of the sliding surface 11, the risk of the protrusion 13A coming into contact with the mating rotary seal ring 20 and being damaged can be avoided.

In addition, since the protrusions 13A are provided in a zigzag pattern, the efficiency of trapping the contaminants C can be enhanced.

Next, modified examples will be described. It should be noted that the same configuration as that of the above-described embodiment and redundant description will be omitted. As shown in FIG. 6, the plurality of introduction groove portions 15, 15, . According to this, the fluidity of the contaminant C mixed in the introduction groove portion 15 is increased, and the sealed liquid F is easily supplied to the Rayleigh step 9A, so that the dynamic pressure generation efficiency can be improved. The depth dimension of the annular groove 19 is substantially the same as the depth dimension of the introduction groove portion 15 . Furthermore, the annular groove 19 is not limited to an endless shape, and may be arranged so as to communicate with at least two introduction groove portions 15, 15 arranged side by side.

7, a plurality of projecting pieces 13b, 13b, . They are arranged side by side in an orderly fashion. According to this, since a plurality of passages of the sealed liquid F are formed in the radial direction in the gaps between the plurality of projecting pieces 13b, 13b, . However, the entrance of the contaminants C (see FIG. 5) toward the atmosphere side can be prevented, and the contaminants C mixed in the introduction groove portion 15 can be easily discharged to the opening portion 15a. In addition, since the protrusion 13B is arranged on the sealed liquid side of the inlet portion 15b and the inner portion 15c, the trapping effect of the contaminant C (see FIG. 5) by the protrusion 13B can be improved.

8, a plurality of projecting pieces 13c, 13c, . Each of the projecting pieces 13c is formed in a cylindrical shape with a different diameter. According to this, the inside of the introduction groove portion 15 forms a complicated flow path due to the plurality of projecting pieces 13c, 13c, . 13C can trap more reliably. In addition, since the projection 13C is disposed on the sealed liquid side of the inlet 15b and the back 15c, the trapping effect of the contamination C (see FIG. 5) by the projection 13C can be improved.

Further, in this embodiment, the sliding surface is of the inside type in which the high-pressure sealed liquid F exists on the outer diameter side of the sliding surface, and the introduction groove portion 15 communicates with the sealed liquid side and the outer diameter side, Since the centrifugal force works in the outer diameter direction, it is easy to remove the contaminants C that are about to enter.

Next, a sliding component according to Example 2 will be described with reference to FIG. It should be noted that the same configuration as that of the above-described embodiment and redundant description will be omitted.

As shown in FIG. 9, the protrusion 131A has a plurality of cylindrical protrusions 131a, 131a, . . . having different diameters. The diameter of the protruding piece 131a gradually decreases, and the plurality of protruding pieces 131a are arranged densely gradually. . . occupying the volume of the introduction groove 15 increases from the opening 15a toward the Rayleigh step 9A. Therefore, when the rotary seal ring 20 rotates relative to the stationary seal ring 101, it is possible to reliably prevent the contamination C (see FIG. 5) from entering the introduction groove portion 15 on the Rayleigh step 9A side.

In addition, the protrusion 131A provided in the introduction groove 15 causes turbulence in the sealed liquid F that has entered the introduction groove 15, and the flow of the sealed liquid F becomes finer due to the plurality of small-diameter protrusions 131a. , the fluidity of the liquid F to be sealed is weakened, and the fluidity of the contaminants C to be mixed with the liquid F to be sealed is also reduced.

In addition, since the protrusion 131A is provided at the inlet 15b of the introduction groove 15 and the sealed liquid side of the deep portion 15c, the trapping effect of the contamination C (see FIG. 5) by the protrusion 131A is improved. can.

Although the protruding piece 131a has been described as forming a column, it is not limited to this, and may be, for example, a prism, or may have a truncated pyramid shape or a truncated cone shape with a tapered tip.

Next, a sliding component according to Example 3 will be described with reference to FIG. It should be noted that the same configuration as that of the above-described embodiment and redundant description will be omitted.

As shown in FIG. 10, a protrusion 132A having a plurality of protrusions 132a, 132a, . The protruding piece 132a forms an isosceles triangle having an isosceles triangle whose side is longer than the base facing the atmosphere in a plan view. A portion corresponding to the upstream side forms a guide surface 132b of the projecting piece 132a. More specifically, the guiding surface 132b forms an inclined surface extending from the inner diameter side toward the sealed liquid side and from the upstream side toward the downstream side in the rotational direction.

Next, the operation of discharging the contaminants C mixed in the introduction groove portion 15 will be described. When the rotary seal ring 20 rotates relative to the stationary seal ring 102 while the dynamic pressure generating mechanism 14 is filled with the sealed liquid F, the sealed liquid F in the dynamic pressure generating mechanism 14 moves downstream in the circumferential direction. move to At this time, the liquid to be sealed F on the surface side facing the rotary seal ring 20 may flow into the Rayleigh step 9A and part of the contamination C may enter the Rayleigh step 9A. It climbs over the land 12 and flows out into the introduction groove portion 15 arranged in parallel on the downstream side of the Rayleigh step 9A. Furthermore, since the guide surface 132b of the protrusion 132A formed in the introduction groove 15 is inclined as described above, the contaminants C that have flowed out are easily pushed out toward the liquid to be sealed by the guide surface 132b. According to this, the contaminant C can be guided toward the outside of the introduction groove portion 15 by the guide surface 132b of the projection portion 132A.

Although it has been described that the projecting piece 132a forms an isosceles triangle in a plan view, the configuration is not limited to this, and any shape having a guide surface 132b capable of guiding the contaminant C toward the liquid to be sealed can be used. For example, the projecting piece may be a plate-like piece having an inclined surface extending from the inner diameter side toward the sealed liquid side and from the upstream side toward the downstream side in the rotational direction. Moreover, the projecting portion may be configured by a mixture of the projecting piece having the guiding surface and another projecting piece having no guiding surface.

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

For example, in the above embodiments, mechanical seals for general industrial machinery were used as sliding parts, but other mechanical seals for automobiles, water pumps, etc. may also be used. In addition, it is not limited to mechanical seals, and sliding parts other than mechanical seals, such as slide bearings, may be used.

In the above-described embodiment, the dynamic pressure generating mechanism is provided only on the stationary seal ring, but the dynamic pressure generating mechanism may be provided only on the rotary seal ring 20. may be provided.

Further, in the above-described embodiment, a plurality of dynamic pressure generating mechanisms having the same shape are provided in the sliding component, but a plurality of dynamic pressure generating mechanisms having different shapes may be provided. Also, the intervals and the number of the dynamic pressure generating mechanisms can be changed as appropriate.

1 Rotating shaft 2 Sleeve 4 Housing 5 Seal cover 7 Bellows 9A Rayleigh step (dynamic pressure generating groove)
10 stationary seal ring (sliding part)
11 Sliding surface 12 Lands 13A, 13B, 13C Projections 13a, 13b, 13c Projection piece 14 Dynamic pressure generating mechanism 15 Introduction groove 15a Opening 20 Rotary seal ring 21 Sliding surface 131A Projection 131a Projection piece 132A Projection 132a Projection piece 132b guiding surface (inclined surface)

Claims (9)

An annular sliding component arranged at a portion of a rotating machine that rotates relatively, wherein the sliding surface of the sliding component includes an introduction groove portion communicating with a sealed fluid side, and an introduction groove portion communicating with the fluid introduction groove portion. A plurality of dynamic pressure generating mechanisms each including a dynamic pressure generating groove extending in the circumferential direction in which the sliding parts relatively rotate are arranged in parallel in the circumferential direction,
A protrusion is provided in the introduction groove ,
The sliding component , wherein the protrusions are a plurality of columns extending from the inner surface of the introduction groove . 2. The sliding part according to claim 1 , wherein said protrusion is integrally formed of the same material as a base material forming said sliding surface. 3. The sliding part according to claim 2 , wherein said projection is made of the same ceramic as the base material forming said sliding surface. 4. The sliding component according to claim 1 , wherein the protrusion is arranged near an opening communicating with the sealed fluid side of the introduction groove. 5. The sliding component according to claim 1 , wherein said protrusion is provided at a position lower than the land of said sliding surface. 6. The sliding component according to any one of claims 1 to 5 , wherein the protrusions are provided in a zigzag pattern. 7. The sliding component according to any one of claims 1 to 6 , wherein the protrusion has an inclined surface that is inclined toward the outside of the introduction groove. 8. The sliding component according to any one of claims 1 to 7 , wherein the plurality of introduction groove portions arranged in parallel along the circumferential direction communicate with each other through an endlessly extending annular groove. The sliding component according to any one of claims 1 to 8 , wherein the introduction groove communicates with the sealed fluid side and the outer diameter side.

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