Sliding component

Abstract

Movement of a fluid from a cavitation region, which is on the upstream side of a dimple formed in a sliding surface, to a positive pressure generation region on the downstream side is smoothened. The present invention is characterized in that: a plurality of dimples (10) are provided independently in the circumferential direction of one sliding surface of a pair of sliding components that slide relative to each other; a cavitation formation region (10a) on the upstream side of the dimples (10) is disposed toward a low-pressure fluid side, a positive pressure generation region (10b) on the downstream side is disposed toward a high-pressure fluid side; and the low-pressure fluid-side edge (10d) of the positive pressure generation region (10b) forms a tapered shape inclined along the rotational direction of an opposing sliding surface from the low-pressure fluid side toward the high-pressure fluid side, and is smoothly connected to the low-pressure fluid-side end of the cavitation formation region (10a).

Description

technical field

[0001] The present invention relates to sliding parts suitable for use in, for example, mechanical seals, bearings, and other sliding parts. In particular, it relates to sliding parts such as seal rings and bearings that require fluid to intervene on sliding surfaces to reduce friction and prevent fluid leakage from the sliding surfaces. Background technique

[0002] In a mechanical seal as an example of a sliding member, in order to maintain the sealing performance for a long period of time, it is necessary to balance the contradictory conditions of "sealing" and "lubrication". In particular, in recent years, due to environmental protection and the like, in order to prevent leakage of the sealed fluid and reduce mechanical loss, the demand for lower friction has been further increased. As a method of reducing friction, it is possible to achieve a so-called fluid lubrication state in which dynamic pressure is generated between sliding surfaces by rotation an...

Examples

Embodiment 1

[0037] refer to Figure 1 to Figure 3 , the sliding member of Embodiment 1 of the present invention will be described.

[0038] In addition, in this embodiment, a case where the member constituting the mechanical seal is a sliding member will be described as an example.

[0039] figure 1 It is a vertical cross-sectional view showing an example of a mechanical seal, and is an inner type mechanical seal that seals the sealed fluid on the high-pressure fluid side that leaks from the outer circumference of the sliding surface toward the inner circumference, and is annular. The rotary ring 3 and the annular fixed ring 5 are pressed between the sliding surfaces S which are mirror-finished by grinding etc. The rotating ring 3 is provided on the side of the rotating shaft 1 that drives the pump impeller (not shown) on the side of the high-pressure fluid in a state capable of rotating integrally with the rotating shaft 1 via the sleeve 2. The fixed ring 5 It is provided in the casi...

Embodiment 2

[0061] Figure 4 It is a figure showing the sliding surface of the sliding member of Example 2 of the present invention, in order to figure 1 The case where a dent is formed on the sliding surface of the fixing ring 5 will be described as an example. Embodiment 2 is the same as figure 2 The shown embodiment 1 is different: a positive pressure generating mechanism composed of Rayleigh steps is arranged on the high-pressure fluid side of the sliding surface provided with dimples, but other aspects are basically the same as embodiment 1, and the same parts are marked the same , and omit repeated descriptions.

[0062] exist Figure 4 Among them, on the sliding surface S, dimples 10 are arranged on the low-pressure fluid side, and a positive pressure generating mechanism composed of Rayleigh steps 20 is arranged on the high-pressure fluid side.

[0063] The Rayleigh step 20 is composed of a narrowed step 21, a groove portion 22, and a radial groove 23 communicating with the ...

Embodiment 3

[0068] Figure 5 It is a figure showing the sliding surface of the sliding member of Example 3 of the present invention, in order to figure 1 The case where a dent is formed on the sliding surface of the fixing ring 5 will be described as an example. Embodiment 3 is the same as figure 2 The shown embodiment 1 is different: a positive pressure generating mechanism composed of Rayleigh steps is arranged on the high-pressure fluid side of the sliding surface provided with dimples, but other aspects are basically the same as embodiment 1, and the same parts are marked the same , and omit repeated descriptions.

[0069] exist Figure 5 Among them, on the sliding surface S, dimples 10 are arranged on the low-pressure fluid side, and a positive pressure generating mechanism composed of Rayleigh steps 30 is arranged on the high-pressure fluid side.

[0070] The Rayleigh step 30 is composed of a narrowed step 31, a groove portion 32, and a radial direction groove 33 communicating...

technical field

[0001] The present invention relates to sliding parts suitable for use in, for example, mechanical seals, bearings, and other sliding parts. In particular, it relates to sliding parts such as seal rings and bearings that require fluid to intervene on sliding surfaces to reduce friction and prevent fluid leakage from the sliding surfaces. Background technique

[0002] In a mechanical seal as an example of a sliding member, in order to maintain the sealing performance for a long period of time, it is necessary to balance the contradictory conditions of "sealing" and "lubrication". In particular, in recent years, due to environmental protection and the like, in order to prevent leakage of the sealed fluid and reduce mechanical loss, the demand for lower friction has been further increased. As a method of reducing friction, it is possible to achieve a so-called fluid lubrication state in which dynamic pressure is generated between sliding surfaces by rotation an...

Examples

Embodiment 1

[0037] refer to Figure 1 to Figure 3 , the sliding member of Embodiment 1 of the present invention will be described.

[0038] In addition, in this embodiment, a case where the member constituting the mechanical seal is a sliding member will be described as an example.

[0039] figure 1 It is a vertical cross-sectional view showing an example of a mechanical seal, and is an inner type mechanical seal that seals the sealed fluid on the high-pressure fluid side that leaks from the outer circumference of the sliding surface toward the inner circumference, and is annular. The rotary ring 3 and the annular fixed ring 5 are pressed between the sliding surfaces S which are mirror-finished by grinding etc. The rotating ring 3 is provided on the side of the rotating shaft 1 that drives the pump impeller (not shown) on the side of the high-pressure fluid in a state capable of rotating integrally with the rotating shaft 1 via the sleeve 2. The fixed ring 5 It is provided in the casi...

Embodiment 2

[0061] Figure 4 It is a figure showing the sliding surface of the sliding member of Example 2 of the present invention, in order to figure 1 The case where a dent is formed on the sliding surface of the fixing ring 5 will be described as an example. Embodiment 2 is the same as figure 2 The shown embodiment 1 is different: a positive pressure generating mechanism composed of Rayleigh steps is arranged on the high-pressure fluid side of the sliding surface provided with dimples, but other aspects are basically the same as embodiment 1, and the same parts are marked the same , and omit repeated descriptions.

[0062] exist Figure 4 Among them, on the sliding surface S, dimples 10 are arranged on the low-pressure fluid side, and a positive pressure generating mechanism composed of Rayleigh steps 20 is arranged on the high-pressure fluid side.

[0063] The Rayleigh step 20 is composed of a narrowed step 21, a groove portion 22, and a radial groove 23 communicating with the ...

Embodiment 3

[0068] Figure 5 It is a figure showing the sliding surface of the sliding member of Example 3 of the present invention, in order to figure 1 The case where a dent is formed on the sliding surface of the fixing ring 5 will be described as an example. Embodiment 3 is the same as figure 2 The shown embodiment 1 is different: a positive pressure generating mechanism composed of Rayleigh steps is arranged on the high-pressure fluid side of the sliding surface provided with dimples, but other aspects are basically the same as embodiment 1, and the same parts are marked the same , and omit repeated descriptions.

[0069] exist Figure 5 Among them, on the sliding surface S, dimples 10 are arranged on the low-pressure fluid side, and a positive pressure generating mechanism composed of Rayleigh steps 30 is arranged on the high-pressure fluid side.

[0070] The Rayleigh step 30 is composed of a narrowed step 31, a groove portion 32, and a radial direction groove 33 communicating...

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