JP7436345B2 - Shaft sealing device, rotating machine, and assembly method of shaft sealing device - Google Patents

Description

The present invention relates to a shaft sealing device, a rotating machine, and a method for assembling the shaft sealing device.

A pump is a rotating machine that pumps a liquid such as water by rotating an impeller placed inside a casing. A pump generally includes a casing having a suction port and a discharge port, an impeller disposed inside the casing, and a rotating shaft to which the impeller is fixed. When the impeller rotates with the rotating shaft, liquid is sucked in through the suction port of the casing. The liquid is pressurized within the casing as the impeller rotates, and is discharged from the discharge port.

The rotating shaft is rotatably supported by a bearing. The bearing is housed in a bearing housing adjacent to the casing. Lubricating oil for lubricating and cooling the bearing is stored in the bearing housing, and the lower part of the bearing is immersed in the lubricating oil. When the inner ring of the bearing rotates, lubricating oil is supplied throughout the bearing.

At the same time, the lubricating oil becomes a mist and fills the inside of the bearing housing due to the stirring action caused by the rotation of the bearing. As a result, mist-like lubricating oil is evenly supplied to the bearing.

Japanese Patent Application Publication No. 2001-004032 Japanese Patent Application Publication No. 2015-166636 JP2017-075621A

However, since the rotating shaft extends through the bearing housing, a gap inevitably exists between the outer peripheral surface of the rotating shaft and the bearing housing. Therefore, the lubricating oil supplied to the bearing may pass through this gap and leak to the outside of the bearing housing.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a shaft sealing device and a rotating machine that can reliably prevent leakage of lubricating oil.
An object of the present invention is to provide a method for assembling a shaft seal device that can reliably prevent leakage of lubricating oil.

In one aspect, a shaft seal device for preventing leakage of lubricating oil supplied to a bearing is provided. The shaft sealing device includes a rotating ring attached to a rotating shaft, a fixed ring arranged opposite to the rotating ring, and a seal ring arranged between the rotating ring and the fixed ring, The seal ring is attached to the rotating ring.

In one aspect, the seal ring has a first dividing surface and a second dividing surface facing each other.
In one aspect, the rotary ring includes a rotary ring-side annular groove formed on an outer peripheral surface of the rotary ring, and a stopper that protrudes from the rotary ring-side annular groove and limits circumferential movement of the seal ring. The stopper is arranged between the first dividing surface and the second dividing surface.
In one aspect, the seal rings are a first seal ring and a second seal ring, and the rotary ring has a first rotary ring-side annular groove in which the first seal ring is accommodated, and a first rotary ring-side annular groove in which the second seal ring is accommodated. a second rotating ring-side annular groove to be accommodated, a first stopper protruding from the first rotating ring-side annular groove, and a second stopper protruding from the second rotating ring-side annular groove; The first stopper and the second stopper are disposed offset in the circumferential direction of the rotating ring when viewed from the axial direction of the rotating shaft.

In one aspect, the rotating ring has an annular step formed at an end on a side of the stationary ring adjacent to the stationary ring, and the stationary ring has an annular step formed at an end on a side of the stationary ring adjacent to the stationary ring. The annular protrusion is formed in the annular step and inserted into the annular step.

In one aspect, an impeller, a casing in which the impeller is housed, a rotating shaft to which the impeller is fixed, a bearing that rotatably supports the rotating shaft, and a bearing housing that accommodates the bearing. A rotating machine is provided that includes the shaft sealing device described above.

In one aspect, a method of assembling a shaft seal device for preventing leakage of lubricating oil supplied to a bearing is provided. The assembly method includes the steps of attaching a rotating ring to a rotating shaft, attaching a seal ring to an annular groove on the rotating ring side formed in the rotating ring, and inserting a fixed ring into a bearing housing that accommodates the bearing. and, including.

In one aspect, the seal ring has a first dividing surface and a second dividing surface facing each other, and the rotating ring includes a rotating ring side annular groove formed on an outer circumferential surface of the rotating ring, and a rotating ring side annular groove formed in an outer peripheral surface of the rotating ring, a stopper protruding from the rotating ring side annular groove, and the assembling method includes fitting the seal ring into the rotating ring side annular groove and moving the stopper between the first dividing surface and the second dividing surface. including the step of placing it between.
In one aspect, the rotating ring has an annular step formed at an end on a side of the stationary ring adjacent to the stationary ring, and the stationary ring has an annular step formed at an end on a side of the stationary ring adjacent to the stationary ring. an annular protrusion formed in the section and inserted into the annular step, and the assembly method includes inserting the annular protrusion into the annular step when inserting the fixing ring into the bearing housing. Including process.

According to the present invention, by arranging the seal ring between the rotating ring and the stationary ring, the shaft sealing device can reliably prevent leakage of lubricating oil.

FIG. 2 is a sectional view showing a pump device including an embodiment of a shaft seal device. FIG. 2 is an enlarged cross-sectional view of the bearing assembly shown in FIG. 1; It is a figure showing one embodiment of a shaft seal device. It is a figure which shows the shaft seal device arrange|positioned adjacent to a bearing. It is a figure showing a seal ring. It is a figure which shows the seal ring attached to the division member of a fixed ring. It is a figure which shows the positional relationship of the stopper formed in the division member and the stopper formed in the movement restriction member. FIG. 3 is a diagram showing the flow of lubricating oil that has entered the shaft sealing device. It is a figure for explaining the assembly method of a shaft seal device. It is a figure for explaining the assembly method of a shaft seal device. It is a figure for explaining the assembly method of a shaft seal device. It is a figure for explaining the assembly method of a shaft seal device. It is a figure for explaining the assembly method of a shaft seal device. It is a figure for explaining the assembly method of a shaft seal device. It is a figure for explaining the assembly method of a shaft seal device. It is a figure showing other embodiments of a shaft sealing device. FIG. 7 is a diagram showing still another embodiment of the shaft sealing device. FIG. 7 is a diagram showing still another embodiment of the shaft sealing device. It is a figure which shows how a seal ring is attached to a rotating ring. FIGS. 20(a) and 20(b) are diagrams showing a seal ring attached to a rotating ring.

Embodiments of the present invention will be described below with reference to the drawings. In the embodiment described below, a pump will be described as an example of a rotating machine, but the rotating machine is not limited to a pump. Other examples of rotating machines include compressors and blowers.

FIG. 1 is a sectional view showing a pump device PA including an embodiment of a shaft seal device. The pump device PA as a rotating machine shown in FIG. 1 includes a pump PA1 and a drive device PA2. The pump PA1 includes an impeller 2, a rotating shaft 1 to which the impeller 2 is fixed, and a casing 5 in which the impeller 2 is housed. The rotating shaft 1 extends horizontally, and the axial direction CL of the rotating shaft 1 coincides with the horizontal direction.

One end of the rotary shaft 1 is connected to a drive machine 10 such as an electric motor (more specifically, a drive shaft 10a of the drive machine 10), and the drive machine 10 rotates the rotary shaft 1 and the impeller 2. The drive machine 10 is at least a part of the components of the drive device PA2.

The casing 5 shown in FIG. 1 has a spiral chamber 5a therein, and the impeller 2 is arranged inside the spiral chamber 5a. When the impeller 2 rotates together with the rotating shaft 1, liquid such as water is sucked in from the suction port 3, the pressure of the liquid is increased by the action of the impeller 2 and the swirl chamber 5a, and the liquid is discharged from the discharge port 4.

A gap between the rotating shaft 1 and the casing 5 is sealed by a shaft seal 11 such as a mechanical seal. The shaft seal 11 can prevent the liquid inside the casing 5 from leaking from the gap between the casing 5 and the rotating shaft 1.

FIG. 2 is an enlarged cross-sectional view of the bearing assembly 9 shown in FIG. As shown in FIG. 2, the rotating shaft 1 is supported by a bearing assembly 9. As shown in FIG. The bearing assembly 9 includes bearings 9A and 9B that rotatably support the rotating shaft 1, and a bearing housing 36 that accommodates the bearings 9A and 9B. In this embodiment, the bearings 9A and 9B are rolling bearings. Lubricating oil is stored inside the bearing housing 36. The liquid level of the lubricating oil in the bearing housing 36 is located below the rotating shaft 1.

Since the bearings 9A and 9B have the same configuration, the configuration of the bearing 9A will be described below. The bearing 9A includes an outer ring 30 fixed to a bearing housing 36, an inner ring 31 fixed to the outer peripheral surface of the rotating shaft 1, and a plurality of rolling elements 32 arranged between the outer ring 30 and the inner ring 31. ing. When the inner ring 31 rotates together with the rotating shaft 1, the plurality of rolling elements 32 rotate between the outer ring 30 and the inner ring 31. The lower part of the bearing 9A is immersed in lubricating oil. Therefore, when the inner ring 31 rotates together with the rotating shaft 1, lubricating oil is supplied to the entire bearing 9A.

The bearing housing 36 includes a housing body 38 that holds lubricating oil, and cover members 37, 37 that close open ends on both sides of the housing body 38. The rotating shaft 1 extends through the cover members 37, 37. A cover member 37 disposed adjacent to the bearing 9A covers the shaft seal 11 while closing one open end of the housing body 38. A cover member 37 disposed adjacent to the bearing 9B closes the other open end of the housing body 38.

When the rotating shaft 1 rotates due to the operation of the pump device PA, the lubricating oil in the bearing housing 36 is supplied to each of the bearings 9A and 9B. A portion of the lubricating oil supplied to each of the bearings 9A, 9B flows toward the cover members 37, 37 through each of the bearings 9A, 9B. Therefore, the bearing assembly 9 includes shaft sealing devices 50, 50 for preventing lubricating oil from leaking from the gap between the cover member 37 and the rotating shaft 1. Each of the shaft seal devices 50, 50 is adjacent to each of the bearings 9A, 9B. The shaft sealing device 50 disposed adjacent to the bearing 9B will be described below.

FIG. 3 is a diagram showing one embodiment of the shaft sealing device 50. FIG. 3 shows a shaft sealing device 50 disposed adjacent to the bearing 9B. As shown in FIG. 3, the shaft sealing device 50 includes a rotating ring 51 attached to the rotating shaft 1, a fixed ring 52 disposed opposite to the rotating ring 51, and a space between the rotating ring 51 and the fixed ring 52. Seal rings 53A and 53B are provided. In the embodiment shown in FIG. 3, two seal rings 53A and 53B are provided, but the number of seal rings is not limited to this embodiment. At least one sealing ring may be provided. Hereinafter, in this specification, the seal rings 53A and 53B may be simply referred to as the seal ring 53 without distinguishing them.

As shown in FIG. 3, the rotating ring 51 is an annular member having an inner circumferential surface 51a that can be brought into close contact with the outer circumferential surface of the rotating shaft 1, and an outer circumferential surface 51b on the opposite side of the inner circumferential surface 51a. The rotating ring 51 is removably attached to the rotating shaft 1. In the embodiment shown in FIG. 3, the rotating ring 51 is a separate member from the rotating shaft 1, but in one embodiment, the rotating ring 51 may be configured integrally with the rotating shaft 1.

FIG. 4 is a diagram showing a shaft sealing device 50 arranged adjacent to the bearing 9A. In FIG. 3, the rotating ring 51 of the shaft sealing device 50 is in contact with the stepped portion 1a of the rotating shaft 1, and movement of the rotating ring 51 in the axial direction CL is restricted. As shown in FIG. 4, the rotating ring 51 may have a protrusion 54 that protrudes toward the bearing 9A. The protruding portion 54 of the rotating ring 51 is in contact with the bearing 9A (more specifically, the inner ring 31), and movement of the rotating ring 51 in the axial direction CL is restricted.

A sealing member 55 such as an O-ring is arranged between the rotating ring 51 and the rotating shaft 1. The seal member 55 is installed in a seal groove 56 formed in the inner circumferential surface 51a of the rotating ring 51. The seal member 55 prevents lubricating oil from leaking from the gap between the rotating ring 51 and the rotating shaft 1.

The rotating ring 51 is arranged concentrically with the rotating shaft 1 and rotates together with the rotating shaft 1. The fixed ring 52 is arranged concentrically with the rotating ring 51 and the rotating shaft 1, and is removably attached to the bearing housing 36 (more specifically, the cover member 37). Since a small gap is formed between the fixed ring 52 and the rotating ring 51 (and the rotating shaft 1), the fixed ring 52 does not rotate together with the rotating shaft 1.

The rotating ring 51 has rotating ring-side annular grooves 60A and 60B formed on its outer peripheral surface 51b. The seal rings 53A, 53B are respectively accommodated in the rotating ring side annular grooves 60A, 60B. In the embodiment shown in FIG. 3, two rotating ring side annular grooves 60A and 60B are provided, but the number of rotating ring side annular grooves is not limited to this embodiment. At least one rotating ring side annular groove may be provided.

In this embodiment, the number of annular grooves on the rotating ring side corresponds to the number of seal rings. However, the number of seal rings may be the same as the number of annular grooves on the rotating ring side or less than the number of annular grooves on the rotating ring side. Hereinafter, in this specification, the rotating ring side annular grooves 60A and 60B may be simply referred to as the rotating ring side annular groove 60 without distinguishing them.

FIG. 5 is a diagram showing the seal ring 53. As shown in FIG. 5, the seal ring 53 has a first dividing surface 53a and a second dividing surface 53b facing each other, and there is a gap between the first dividing surface 53a and the second dividing surface 53b. is formed. In the embodiment shown in FIG. 5, the seal ring 53 has a C-shape. Therefore, the operator can increase the inner diameter of the seal ring 53 by moving the first dividing surface 53a and the second dividing surface 53b in a direction away from each other. The seal ring 53 is made of a relatively soft material, such as resin (tetrafluoroplastic (PTFE), etc.).

The inner diameter of the seal ring 53 is smaller than the diameter of the outer peripheral surface 51b of the rotating ring 51 (see FIG. 3). Therefore, the operator moves the seal ring 53 in the axial direction CL with the seal ring 53 expanded, and accommodates the seal ring 53 in the rotary ring side annular groove 60 of the rotary ring 51. The inner diameter of the seal ring 53 is larger than the diameter of the annular groove 60 on the rotating ring side. Therefore, when the seal ring 53 is accommodated in the rotating ring side annular groove 60, a slight gap is formed between the seal ring 53 and the rotating ring side annular groove 60.

As shown in FIG. 3, the seal ring 53 is attached to the fixed ring 52. The fixed ring 52 includes at least one divided member 61 to which the seal ring 53 is attached, and a movement restriction member 62 that restricts movement of the divided member 61 in the axial direction CL of the rotating shaft 1. Thus, in the embodiment shown in FIG. 3, the fixing ring 52 has a split structure. The divided structure of the shaft sealing device 50 will be explained below.

FIG. 6 is a diagram showing the seal ring 53A attached to the dividing member 61 of the fixed ring 52. The dividing member 61 has an annular shape and is arranged concentrically with the rotating shaft 1 and the rotating ring 51 . The dividing member 61 has an outer circumferential surface 61a adjacent to the inner circumferential surface 37a of the cover member 37, and an inner circumferential surface 61b adjacent to the outer circumferential surface 51b of the rotating ring 51 (see FIG. 3).

As shown in FIG. 6, the dividing member 61 has a fixed ring side annular groove 65 into which the seal ring 53A is mounted. The fixed ring side annular groove 65 is formed on the inner peripheral surface 61b of the dividing member 61. The dividing member 61 includes a stopper 66 protruding from the fixed ring side annular groove 65, and the stopper 66 is arranged between the first dividing surface 53a and the second dividing surface 53b of the seal ring 53A. The stopper 66 limits movement of the seal ring 53A in the circumferential direction by arranging the first dividing surface 53a and the second dividing surface 53b on both sides thereof.

As shown in FIG. 3, the seal ring 53A is installed in a fixed ring side annular groove 65 formed on the inner circumferential surface 61b of the dividing member 61, and on the rotating ring side formed on the outer circumferential surface 51b of the rotating ring 51. It is accommodated in the annular groove 60A. Therefore, movement of the seal ring 53A in the axial direction CL is restricted by the dividing member 61 and the rotating ring 51.

The movement limiting member 62 has an outer circumferential surface 62 a adjacent to the inner circumferential surface 37 a of the cover member 37 and an inner circumferential surface 62 b adjacent to the outer circumferential surface 51 b of the rotating ring 51 . The movement limiting member 62 has a fixed ring side annular groove 67 into which the seal ring 53B is mounted. The fixed ring side annular groove 67 is formed on the inner circumferential surface 62b of the movement limiting member 62.

The movement limiting member 62 includes a stopper 68 that protrudes from the fixed ring side annular groove 67 (see FIG. 3). Like the stopper 66, the stopper 68 is disposed between the first dividing surface 53a and the second dividing surface 53b of the seal ring 53B, and limits movement of the seal ring 53B in the circumferential direction.

FIG. 7 is a diagram showing the positional relationship between the stopper 66 formed on the dividing member 61 and the stopper 68 formed on the movement limiting member 62. In FIG. 7, the stoppers 66 and 68 are depicted when the shaft sealing device 50 is viewed from the axial direction CL. In the embodiment shown in FIG. 3, the stopper 66 and the stopper 68 are arranged in a straight line along the axial direction CL.

As shown in FIG. 7, the stopper 66 and the stopper 68 may be disposed offset in the circumferential direction of the fixing ring 52 when the shaft sealing device 50 is viewed from the axial direction CL. In the embodiment shown in FIG. 7, stopper 68 is offset by 90 degrees with respect to stopper 66, but the angle between stopper 66 and stopper 68 is Not limited. For example, when two stoppers are provided, the first stopper and the second stopper may be arranged at an interval of 180 degrees in the circumferential direction of the fixing ring 52 when the shaft sealing device 50 is viewed from the axial direction CL. When three stoppers are provided, the first stopper, the second stopper, and the third stopper are arranged at intervals of 120 degrees in the circumferential direction of the fixed ring 52 when the shaft sealing device 50 is viewed from the axial direction CL. Good too.

Although not shown, when a plurality of divided members 61 are provided, each of the plurality of stoppers may be arranged in a straight line along the axial direction CL, and may be displaced at a predetermined angle in the circumferential direction of the fixing ring 52. It may be arranged as follows.

In the embodiment described above, one stopper is formed in one fixed ring side annular groove, but in one embodiment, a plurality of stoppers may be formed in one fixed ring side annular groove. In this case, the plurality of stoppers may be arranged to be shifted in the circumferential direction of the fixing ring 52 when the shaft sealing device 50 is viewed from the axial direction CL.

The seal ring 53B is installed in a fixed ring side annular groove 67 formed on the inner circumferential surface 62b of the movement limiting member 62, and is accommodated in a rotating ring side annular groove 60B formed on the outer circumferential surface 51b of the rotating ring 51. ing. Therefore, movement of the seal ring 53B in the axial direction CL is restricted by the movement limiting member 62 and the rotation ring 51.

As described above, the movement limiting member 62 limits the movement of the dividing member 61 in the axial direction CL. More specifically, as shown in FIG. 3, the movement limiting member 62 includes a pressing end surface 62c that presses the dividing member 61 against the end wall 39 of the cover member 37, and a fastening flange 69 that extends outward from the outer peripheral surface 62a. We are prepared.

The pressing end surface 62c is connected to both the outer peripheral surface 62a and the fixed ring side annular groove 67. By inserting the movement limiting member 62 into the cover member 37 with the dividing member 61 inserted into the cover member 37, the pressing end surface 62c of the movement restricting member 62 comes into close contact with the dividing member 61, and the dividing member 61 is inserted into the cover member. 37 against the end wall 39.

As shown in FIG. 3, the rotating ring 51 has an annular step 75 formed at an end 51c on the side of the fixed ring 52 adjacent to the fixed ring 52. The movement limiting member 62) has an annular protrusion 76 formed at an end 62d on the rotating ring 51 side adjacent to the rotating ring 51 and inserted into the annular step 75. By inserting the movement limiting member 62 into the cover member 37, the annular protrusion 76 is inserted into the gap between the annular step portion 75 and the rotating shaft 1.

The shaft sealing device 50 includes a fastening member 70 that fastens the fixing ring 52 (more specifically, the movement limiting member 62) to the bearing housing 36 (more specifically, the cover member 37). The fastening flange 69 of the movement limiting member 62 has a through hole 69a through which the fastening member 70 can pass. The through hole 69a extends parallel to the axial direction CL.

In the embodiment shown in FIG. 3, fastening member 70 is a screw. The operator inserts the fastening member 70 into the through hole 69a and the insertion hole 40 with the through hole 69a of the fastening flange 69 and the insertion hole 40 of the cover member 37 aligned, and tightens the fastening member 70. By this tightening, the movement limiting member 62 is fastened to the cover member 37. Since the dividing member 61 is pressed against the end wall 39 of the cover member 37 by the movement limiting member 62, movement of the dividing member 61 in the axial direction CL is restricted.

The fastening member 70 can adjust the relative position of the fixed ring 52 (more specifically, the movement limiting member 62) with respect to the bearing housing 36 (more specifically, the cover member 37). As shown in FIG. 3, the insertion hole 40 has a threaded groove formed therein. Therefore, the operator can adjust the relative position of the movement limiting member 62 with respect to the cover member 37 according to the degree of tightening of the fastening member 70.

FIG. 8 is a diagram showing the flow of lubricating oil that has entered the shaft sealing device 50. In FIG. 8, illustration of symbols is omitted to make the drawing easier to read. As shown in FIG. 8, when the rotating shaft 1 rotates, the lubricating oil scattered within the bearing housing 36 flows through the gap between the rotating ring 51 and the cover member 37 to the fixed ring 52 (more specifically, It enters between the member 61) and the rotating ring 51. This lubricating oil collides with the seal ring 53A disposed between the fixed ring side annular groove 65 and the rotating ring side annular groove 60A, and the progress of the lubricating oil is inhibited. Since the sealing member 55 is disposed between the rotating shaft 1 and the rotating ring 51, leakage of lubricating oil through the gap between the rotating shaft 1 and the rotating ring 51 is prevented.

Furthermore, by arranging the seal ring 53A between the fixed ring side annular groove 65 and the rotating ring side annular groove 60A, a first annular space is formed between the rotating ring 51 and the dividing member 61. This first annular space has a zigzag shape (that is, a zigzag shape) with respect to the axial direction CL by arranging the seal ring 53A. Therefore, the shaft seal device 50 has a function as a labyrinth seal, and as a result, the lubricating oil is shaken off from the gas flow by its own weight, and its progress to the outside of the bearing housing 36 is inhibited.

Similarly, by arranging the seal ring 53B between the fixed ring side annular groove 67 and the rotating ring side annular groove 60B, a second annular space is formed between the rotating ring 51 and the movement limiting member 62. Ru. The second annular space has the same zigzag shape as the first annular space by arranging the seal ring 53B. Therefore, even if the lubricating oil passes through the first annular space, the second annular space reliably prevents the lubricating oil from leaking.

The shaft seal device 50 having such a structure functions as a labyrinth seal and can reliably prevent leakage of lubricating oil. Furthermore, by inserting the annular projection 76 formed on the fixed ring 52 into the annular step 75 formed on the rotating ring 51, leakage of lubricating oil can be more reliably prevented.

As described above, since the shaft sealing device 50 has a divided structure, an operator can easily assemble the shaft sealing device 50. Hereinafter, a method for assembling the shaft sealing device 50 will be explained.

The operator attaches the rotating ring 51 to the rotating shaft 1, accommodates the seal ring 53 in the rotating ring side annular groove 60 formed in the rotating ring 51, and inserts the fixed ring 52 into the bearing housing 36 (more specifically, The seal ring 53 is attached to the fixing ring 52 by inserting it into the cover member 37). More specifically, the operator assembles the shaft sealing device 50 according to the following procedure.

9 to 15 are diagrams for explaining a method of assembling the shaft sealing device 50. First, an operator attaches the rotary ring 51 with the seal member 55 attached to the rotary shaft 1, and brings the rotary ring 51 into contact with the stepped portion 1a of the rotary shaft 1 (see FIG. 9). Thereafter, as shown in FIG. 10, the operator attaches the cover member 37 to the housing body 38 (see FIG. 2) of the bearing housing 36.

As described above, the seal ring 53A (and the seal ring 53B) can be deformed in a direction in which the inner diameter thereof becomes larger. Therefore, the operator inserts the seal ring 53A into the rotary ring 51 with the seal ring 53A expanded, and accommodates the seal ring 53A in the rotary ring side annular groove 60A (see FIG. 11). As shown in FIG. 12, the operator inserts the split member 61 into the cover member 37 and attaches the seal ring 53A to the fixed ring side annular groove 65 of the split member 61. At this time, the seal ring 53A is attached to the fixed ring side annular groove 65 so that the first dividing surface 53a and the second dividing surface 53b of the seal ring 53A are arranged on both sides of the stopper 66.

As shown in FIG. 13, the operator inserts the seal ring 53B into the rotating ring 51 with the seal ring 53B expanded, and accommodates the seal ring 53B in the rotating ring side annular groove 60B. Thereafter, the operator inserts the movement limiting member 62 into the cover member 37 and attaches the seal ring 53B to the fixed ring side annular groove 67 of the movement limiting member 62 (see FIG. 14). At this time, the seal ring 53B is attached to the fixed ring side annular groove 67 so that the first dividing surface 53a and the second dividing surface 53b of the seal ring 53B are arranged on both sides of the stopper 68.

By inserting the movement limiting member 62 into the cover member 37, the divided member 61 is pressed against the cover member 37, so that movement of the divided member 61 in the axial direction CL is restricted. Further, by inserting the movement limiting member 62 into the cover member 37, the annular projection 76 is inserted between the annular step portion 75 and the rotating shaft 1.

After inserting the movement limiting member 62 into the cover member 37, the operator fastens the movement limiting member 62 to the cover member 37 using the fastening member 70 (see FIG. 15). Since the dividing member 61 is pressed against the cover member 37 by the movement restricting member 62, vibration of the dividing member 61 due to operation of the pump device PA can be prevented by fastening the movement restricting member 62.

As described above, since the shaft sealing device 50 has a divided structure, an operator can easily install the shaft sealing device 50 having a plurality of annular spaces by simply inserting the divided member 61 into the cover member 37. can be easily assembled. With such a configuration, the seal ring 53 can be easily replaced, and the maintainability of the shaft sealing device 50 can be improved.

The method of assembling the shaft sealing device 50 is not limited to the method described above. In one embodiment, an operator may first assemble the cover member 37 into the housing body 38 and then attach the rotation ring 51 with the seal member 55 attached to the rotating shaft 1. After that, the operator assembles the shaft sealing device 50 by executing the method shown in FIGS. 11 to 15.

In the embodiment described above, the fixed ring 52 having a split structure has been described, but in one embodiment, not only the fixed ring 52 but also the rotating ring 51 may have a split structure.

The sealing performance required of the shaft sealing device 50 may vary depending on conditions such as the environment in which the pump device PA is installed and the application. According to the embodiment described above, in order to further improve the sealing performance of the shaft sealing device 50, if the plurality of divided members 61 are arranged in series along the axial direction CL, the shaft sealing device 50 can improve the sealing performance of the shaft sealing device 50. It is possible to have a zigzag annular space depending on the number. As a result, the shaft sealing device 50 can further improve its sealing performance. By fastening the movement limiting member 62 to the cover member 37, the plurality of divided members 61 are pressed against the end wall 39 of the cover member 37, so that the divided members 61 are prevented from falling off or vibrating.

In this embodiment, the plurality of dividing members 61 can have the same structure. Therefore, by manufacturing a plurality of divided members 61 having the same structure, manufacturing costs can be reduced, and the overall inventory of components of the shaft sealing device 50 can be reduced. Furthermore, the sealing performance of the shaft sealing device 50 can be improved depending on conditions such as the operating status and installation environment of the pump device PA.

As described above, the shaft seal device 50 has an annular space and functions as a labyrinth seal. When the rotating ring 51 rotates together with the rotating shaft 1, a swirling flow of gas may occur in the annular space. Such a swirling flow causes vibrations of the rotating ring 51 and the rotating shaft 1. In this embodiment, each of the stoppers 66 and 68 functions as a swirl breaker that breaks the swirling flow. Therefore, the shaft sealing device 50 can prevent the generation of swirling flow and suppress vibrations of the rotating ring 51 and the rotating shaft 1.

FIG. 16 is a diagram showing another embodiment of the shaft sealing device 50. The configuration of this embodiment, which is not particularly explained, is the same as the embodiment described above, and therefore, the redundant explanation will be omitted. In the embodiment described above, the shaft sealing device 50 has a multiple-stage (more specifically, two-stage) sealing structure, but as shown in FIG. 16, the shaft sealing device 50 has a single-stage sealing structure. It may have a sealed structure.

In the embodiment shown in FIG. 16, the fixed ring 52 includes a single fixed ring-side annular groove 80 formed on the inner peripheral surface 52a, and a stopper 81 protruding from the fixed ring-side annular groove 80. . The stopper 81 is disposed between the first dividing surface 53a and the second dividing surface 53b of the seal ring 53, and restricts movement of the seal ring 53 in the circumferential direction.

The rotary ring 51 has a single rotary ring side annular groove 60 formed on its outer peripheral surface 51b, and the seal ring 53 is accommodated in this rotary ring side annular groove 60. The shaft sealing device 50 may have such a structure.

In the embodiment shown in FIG. 16, the operator first attaches the rotary ring 51 with the seal member 55 attached to the rotary shaft 1, and then stores the seal ring 53 in the rotary ring side annular groove 60 of the rotary ring 51. do. The operator inserts the fixing ring 52 into the cover member 37 and attaches the seal ring 53 to the annular groove 80 on the fixing ring side. At this time, the seal ring 53 is attached to the fixed ring side annular groove 80 so that the first dividing surface 53a and the second dividing surface 53b of the seal ring 53 are arranged on both sides of the stopper 81. According to the embodiment shown in FIG. 16, an operator can assemble the shaft sealing device 50 using a simpler method.

FIG. 17 is a diagram showing still another embodiment of the shaft sealing device 50. The configuration of this embodiment, which is not particularly explained, is the same as the embodiment described above, and therefore, the redundant explanation will be omitted. In the embodiment shown in FIG. 17, the fixed ring 52 does not have the fixed ring side annular grooves 65, 67 and has a flat annular shape. The seal rings 53A and 53B have a close contact structure that allows them to come into close contact with the inner circumferential surface 52a of the fixed ring 52.

More specifically, the close contact structure is composed of the outer circumferential surfaces of the seal rings 53A and 53B, which have a diameter equal to or larger than the diameter of the inner circumferential surface 52a of the fixed ring 52. Therefore, when inserting the fixing ring 52 into the cover member 37, each of the seal rings 53A, 53B fits tightly into the fixing ring 52. In this way, the seal rings 53A, 53B are attached to the fixed ring 52.

In the embodiment shown in FIG. 17, the method of assembling the shaft sealing device 50 is as follows. An operator first attaches the rotary ring 51 to which the seal member 55 is attached to the rotary shaft 1 . Thereafter, the operator moves each of the seal rings 53A, 53B in the axial direction CL with each of the seal rings 53A, 53B expanded, and moves each of the seal rings 53A, 53B into the rotating ring side annular grooves 60A, 60B. be accommodated in each of the In this state, the operator inserts the fixing ring 52 into the cover member 37 and attaches each of the seal rings 53A and 53B to the fixing ring 52.

Also in the embodiment shown in FIG. 17, by arranging seal rings 53A and 53B between the rotating ring 51 and the fixed ring 52, a zigzag first annular space is created between the rotating ring 51 and the fixed ring 52. and a second annular space is formed. The shaft sealing device 50 having such a structure can reliably prevent leakage of lubricating oil.

Although not shown, stoppers may be formed in each of the rotating ring side annular grooves 60A and 60B in the embodiment shown in FIG. 17 as well. By forming the stopper, the shaft sealing device 50 can prevent the generation of swirling flow and suppress vibrations of the rotating ring 51 and the rotating shaft 1.

In the embodiment described above, the configuration in which the seal ring 53 is attached to the fixed ring 52 has been described, but the seal ring 53 may be attached to the rotating ring 51. Hereinafter, a configuration for mounting the seal ring 53 on the rotary ring 51 will be described with reference to the drawings.

FIG. 18 is a diagram showing still another embodiment of the shaft sealing device 50. The configuration of this embodiment, which is not particularly explained, is the same as the embodiment described above, and therefore, the redundant explanation will be omitted. In the embodiment shown in FIG. 18, each of the seal rings 53A, 53B is attached to the rotating ring 51. In addition, also in this embodiment, the number of seal rings 53 is not limited to this embodiment, and at least one seal ring 53 may be provided.

FIG. 19 is a diagram showing how the seal ring 53 is attached to the rotating ring 51. 20(a) and 20(b) are views showing the seal ring 53 attached to the rotating ring 51. FIG. FIG. 20(a) shows the seal ring 53 attached to the rotating ring 51 when the shaft sealing device 50 is viewed from the axial direction CL, and FIG. The seal ring 53 attached to the rotating ring 51 is shown when viewed from the direction.

As shown in FIGS. 18 to 20, stoppers 90 and 91 are provided in each of the rotating ring side annular grooves 60A and 60B, respectively. Also in this embodiment, each of the seal rings 53A, 53B has a first dividing surface 53a and a second dividing surface 53b. The seal ring 53A is attached to the rotating ring side annular groove 60A so that the first dividing surface 53a and the second dividing surface 53b are arranged on both sides of the stopper 90. This arrangement restricts the movement of the seal ring 53A in the axial direction CL and the movement of the seal ring 53A in the circumferential direction.

Similar to the seal ring 53A, the seal ring 53B is installed in the rotating ring side annular groove 60B so that the first dividing surface 53a and the second dividing surface 53b are arranged on both sides of the stopper 91.

Also in the embodiments shown in FIGS. 18 to 20, each of the stoppers 90 and 91 functions as a swirl breaker that destroys the swirling flow generated in the rotating ring side annular grooves 60A and 60B. Therefore, the shaft sealing device 50 can prevent the generation of swirling flow and suppress vibrations of the rotating ring 51 and the rotating shaft 1.

In the embodiment shown in FIG. 18, the stoppers 90 and 91 are arranged in a straight line along the axial direction CL, but they may also be arranged offset at a predetermined angle in the circumferential direction of the rotating ring 51. good.

In the embodiments shown in FIGS. 18 to 20, one stopper is formed in one rotating ring side annular groove, but in one embodiment, a plurality of stoppers may be formed in one rotating ring side annular groove. good. In this case, the plurality of stoppers may be arranged to be shifted in the circumferential direction of the rotary ring 51 when the shaft sealing device 50 is viewed from the axial direction CL.

Also in this embodiment, the operator can easily assemble the shaft sealing device 50. First, an operator attaches the rotary ring 51 to which the seal member 55 is attached to the rotary shaft 1 . After that, the operator attaches the seal ring 53A to the rotating ring side annular groove 60A so that the stopper 90 is disposed between the first dividing surface 53a and the second dividing surface 53b of the seal ring 53A. Using a similar method, the operator attaches the seal ring 53B to the rotating ring side annular groove 60B. The operator inserts the fixing ring 52 into the cover member 37 so that the annular protrusion 76 of the fixing ring 52 is inserted into the gap between the annular step 75 of the rotating ring 51 and the rotating shaft 1. Thereafter, the operator fastens the fixing ring 52 to the cover member 37 using the fastening member 70.

An operator can assemble the shaft sealing device 50 using such a simple method. Also in this embodiment, the shaft sealing device 50 has an annular space formed between the rotating ring 51 and the stationary ring 52. Therefore, the shaft seal device 50 can reliably prevent leakage of lubricating oil.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical idea described in the claims.

1 Rotating shaft 2 Impeller 3 Suction port 4 Discharge port 5 Casing 5a Spiral chamber 9 Bearing assembly 9A, 9B Bearing 10 Drive machine 10a Drive shaft 11 Shaft seal 30 Outer ring 31 Inner ring 32 Rolling element 36 Bearing housing 37 Cover member 37a Inside Surrounding surface 38 Housing body 39 End wall 40 Insertion hole 50 Shaft sealing device 51 Rotating ring 51a Inner peripheral surface 51b Outer peripheral surface 51c End portion 52 Fixed ring 52a Inner peripheral surface 53 (53A, 53B) Seal ring 53a First divided surface 53b Two-way dividing surface 54 Projection 55 Seal member 56 Seal groove 60 (60A, 60B) Rotating ring side annular groove 61 Dividing member 61a Outer circumferential surface 61b Inner circumferential surface 62 Movement limiting member 62a Outer circumferential surface 62b Inner circumferential surface 62c Pressing end surface 62d End 65 Fixed ring side annular groove 66 Stopper 67 Fixed ring side annular groove 68 Stopper 69 Fastening flange 69a Through hole 70 Fastening member 75 Annular step 76 Annular projection 80 Fixed ring side annular groove 81 Stopper 90 Stopper 91 Stopper

Claims (6)

A shaft sealing device for preventing leakage of lubricating oil supplied to a bearing,
A rotating ring attached to the rotating shaft,
a fixed ring disposed opposite the rotating ring;
a seal ring disposed between the rotating ring and the stationary ring,
the seal ring is attached to the rotating ring,
The seal ring has a first dividing surface and a second dividing surface facing each other,
The rotating ring is
a rotating ring side annular groove formed on the outer peripheral surface of the rotating ring;
a stopper that protrudes from the annular groove on the rotating ring side and limits movement of the seal ring in the circumferential direction;
In the shaft sealing device, the stopper is disposed between the first dividing surface and the second dividing surface . A shaft sealing device for preventing leakage of lubricating oil supplied to a bearing,
A rotating ring attached to the rotating shaft,
a fixed ring disposed opposite the rotating ring;
a seal ring disposed between the rotating ring and the stationary ring,
the seal ring is attached to the rotating ring,
The seal rings are a first seal ring and a second seal ring,
The rotating ring is
a first rotating ring side annular groove in which the first seal ring is accommodated;
a second rotating ring side annular groove in which the second seal ring is accommodated;
a first stopper protruding from the first rotating ring side annular groove;
a second stopper protruding from the second rotating ring side annular groove,
In the shaft sealing device, the first stopper and the second stopper are disposed offset in the circumferential direction of the rotating ring when viewed from the axial direction of the rotating shaft. The rotating ring has an annular step formed at an end on the fixed ring side adjacent to the fixed ring,
The shaft seal according to claim 1 or 2 , wherein the fixed ring has an annular projection formed at an end on the rotating ring side adjacent to the rotating ring and inserted into the annular step. Device. impeller and
a casing in which the impeller is housed;
a rotating shaft to which the impeller is fixed;
a bearing that rotatably supports the rotating shaft;
a bearing housing that accommodates the bearing;
A rotating machine comprising the shaft sealing device according to any one of claims 1 to 3 . A method for assembling a shaft seal device for preventing leakage of lubricating oil supplied to a bearing, the method comprising:
a step of attaching the rotating ring to the rotating shaft;
attaching a seal ring to a rotating ring-side annular groove formed in the rotating ring;
inserting a fixing ring into a bearing housing housing the bearing ;
The seal ring has a first dividing surface and a second dividing surface facing each other,
The rotating ring is
a rotating ring side annular groove formed on the outer peripheral surface of the rotating ring;
a stopper protruding from the annular groove on the rotating ring side;
The assembly method includes the steps of fitting the seal ring into the rotating ring-side annular groove and arranging the stopper between the first dividing surface and the second dividing surface. The rotating ring has an annular step formed at an end on the fixed ring side adjacent to the fixed ring,
The fixed ring has an annular protrusion formed at an end on the rotating ring side adjacent to the rotating ring and inserted into the annular step,
6. The method of claim 5 , wherein the assembly method includes inserting the annular projection into the annular step when inserting the locking ring into the bearing housing.

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