KR200230782Y1 - Fluid film lubricated mechanical face seal unit - Google Patents

Abstract

The present invention is a fluid membrane lubrication to prevent the internal fluid (A) sealed in the fluid machine from leaking to the atmosphere (B) by a sealing device composed of the seal sheets (30, 30a) and the seal rings (40, 40a) It relates to a mechanical plane sealing device 20 of the type.

The sealing device of the present invention, the lubrication inclined surface 32, the lubrication inclined surface 32 and the first seal sheet 30 is formed with a stage 33, the lubricated inclined surface 32 and the sliding friction movement and the spiral groove 41 The spiral inclined surface 42 is formed, a circular groove 43 and a vertical flat dam 44 are formed at the inner diameter side end of the spiral groove 41, and the first outer circumferential surface is covered by the fluid extrusion collar 50. A main sealing device composed of a seal ring 40, a second seal sheet 30a having a lubricating inclined surface 32a having a lubrication tool 31a formed thereon, and a first sealing ring having sliding friction with the lubricating inclined surface 32a. A second sealing ring 40a having a spiral inclined surface 42a having a reverse spiral groove 41a formed therein with respect to the spiral groove 41 of 40, and a circular groove 43a formed at an outer diameter side end of the spiral groove 41a. ),

Accordingly, the leakage of the sealed internal fluid of the fluid machine can be completely blocked by the lubrication action of the fluid film formed on the sliding friction surface.

Description

Mechanical flat seal device with fluid film lubrication method {FLUID FILM LUBRICATED MECHANICAL FACE SEAL UNIT}

The present invention relates to a machine plane sealing device, and more particularly, in the various fluid machines such as pumps and blowers, the fluid film is forcibly formed on the sliding friction surface between the seal and the seal seat to minimize the generation of frictional heat and at the same time, the fluid The present invention relates to a machine flat seal device of fluid membrane lubrication that prevents the internal fluid mixed with foreign matter from the machine from entering the sliding friction surface.

Referring to FIG. 1, the conventional machine plane sealing device 10 is in the axial direction with the rotational force of the rotating shaft 11 in a state in which the sealing ring 13 is in contact with the seal sheet 12 fixed to the rotating shaft 11. The seal sheet 12 and the seal ring 13 are made to slide dry friction movement by the force of the spring 14 applied, and the seal sheet 12 and the seal ring 13 perform sliding dry friction movement. As a result, the contact surface pressure generated prevents the internal fluid A sealed in the fluid machine, such as a pump or blower, which is fastened to the mechanical plane seal device 10 from leaking into the air B.

At this time, most of the contact surface pressure is dependent on the force of the spring 14 is applied in the axial direction, the angle of the sliding friction surface and the rotating shaft 11 is equal to the pressing force of the seal sheet 12 and the sealing ring ( It acts on the sliding friction surface of 13) and is kept at right angles to increase the sealing effect.

In particular, the frictional heat generated between the seal sheet 12 and the seal ring 13 is cooled in an indirect manner by the flushing of the coolant supplied from the outside through the coolant inlet 15 and sealed in the pump or blower. The internal fluid A is released as it slightly leaks into the sliding friction surface of the seal sheet 12 and the seal ring 13.

However, in the conventional mechanical plane sealing device 10 as described above, the internal fluid A in which frictional heat generated in the sliding friction surface of the seal seat 12 and the seal ring 13 is slightly leaked from the pump or the blower. Since the relief by itself corresponds to the leakage of the sealing fluid, there is a problem in that the sealing performance of the mechanical seal device 10 is sharply lowered.

In addition, in the actual situation, the sliding friction surface between the seal sheet 12 and the seal ring 13 is very difficult to seal in a right angle with respect to the rotation shaft 11, and the sealed inner fluid A There is a problem that the various foreign matter included easily enters the gap between the seal sheet 12 and the seal ring (13).

In particular, in the conventional machine plane sealing apparatus 10, wherein the sliding friction surface between the seal sheet 12 and the seal ring 13 maintains a right angle with respect to the rotating shaft 11, as described above, the seal sheet Since the sliding friction surfaces of (12) and the seal ring (13) are in principle dry friction, they always have problems such as friction heat generation, damage and abrasion caused by thermal deformation, and deterioration of durability. Even though the sliding friction surface between the seal sheet 12 and the seal ring 13 is cooled, it is difficult to expect a satisfactory sealing and cooling effect, and the seal sheet 12 and the seal ring 13 need to be frequently replaced. There is a problem.

Accordingly, the present invention is to overcome the above-mentioned conventional problems, and an object of the present invention is to use two seal sheets and two seal rings capable of forcibly forming a fluid film on the sliding friction surface, such as a pump or blower. Forming a main sealing device in direct contact with the fluid inside the fluid machine and an auxiliary sealing device for assisting the main sealing device, and covering the sealing of the main sealing device with a fluid extrusion collar to be sealed by the lubrication of the fluid film. To provide a mechanical plane sealing device of the fluid film lubrication method to completely block the leakage of fluid.

Mechanical plane sealing device of the fluid film lubrication method for achieving the object of the present invention is a sealing device in which the sealing ring is in contact with the seal seat is fixed to the rotating shaft by the rotational force of the rotary shaft and the spring force applied in the axial direction In a mechanical plane seal device designed to prevent leakage of internal fluid sealed in a fluid machine into the atmosphere by frictional movement,

The sealing device,

A first seal sheet having a lubrication slope formed with a lubrication port on the inner diameter side and a first seal sheet having a stage is formed on the outer diameter side, and a helical slope formed with a spiral groove while sliding sliding with the lubrication slope of the first seal sheet is formed. A circular sealing groove and a vertical flat dam are formed at the inner diameter side end, and a main sealing device composed of a first sealing ring whose outer peripheral surface is covered by a fluid extrusion collar having a tapered spiral groove on the outer peripheral surface thereof, and a lubricating inclined surface having a lubricating hole formed on the inner diameter side thereof. The formed second seal sheet and a helical inclined surface which is in sliding motion with the lubricated inclined surface of the second seal sheet on the outer diameter side and is formed with a reverse spiral groove with respect to the spiral groove of the first sealing ring, Characterized in that the secondary sealing device consisting of a second sealing ring is formed with a circular groove on the outer diameter side end.

1 is a block diagram showing a conventional machine plane sealing apparatus,

Figure 2 is a block diagram showing a mechanical plane sealing device of the fluid film lubrication method according to the present invention,

3 is a perspective view illustrating the first seal sheet of FIG. 2;

4 is a perspective view illustrating the first sealing ring of FIG. 2;

5 is a perspective view illustrating a second seal sheet of FIG. 2;

6 is a perspective view illustrating the second sealing ring of FIG. 2;

FIG. 7 is a perspective view of the fluid extrusion collar of FIG. 2. FIG.

<Explanation of symbols for the main parts of the drawings>

10: machine plane sealing device 11: rotating shaft

12: Seal sheet 13: Sealing

14: spring 15: cooling water inlet

20: machine plane sealing device 21: rotating shaft

22: spring 23: flange

24: stop collar 24a: chamber

24b: outlet 25: O-ring

26: sleeve 27: swivel collar

28: snap ring 29a: high pressure coolant inlet

29b: low pressure coolant inlet 30: first seal sheet

30a: 2nd seal sheet 31,31a: lubricating hole

32, 32a: lubrication slope 33:

40: first sealing ring 40a: second sealing ring

41,41a: Helix groove 42,42a: Helix slope

43,43a: Circular groove 44: Vertical flat dam

50: fluid extrusion collar 51: tapered spiral groove

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 to 7, the mechanical plane sealing device 20 of the fluid membrane lubrication method according to the present invention is in contact with the seal rings 40 and 40a to the seal sheets 30 and 30a fixed to the rotating shaft 21. As the sealed device performs sliding friction movement by the rotational force of the rotary shaft 21 and the force of the spring 22 applied in the axial direction, the internal fluid A sealed in the fluid machine leaks into the air B. To block them.

The sealing device comprises a main sealing device composed of the first seal sheet 30 and the first sealing ring 40, and an auxiliary sealing device composed of the second seal sheet 30a and the second sealing ring 40a. do.

The first seal sheet 30 of the main sealing device has a lubrication inclined surface 32 and a stage 33 having a lubrication tool 31 formed on an inner diameter side thereof.

The first sealing ring 40 of the main sealing device is a sliding frictional movement with the lubricating inclined surface 32 of the first seal sheet 30 on the outer diameter side and a spiral inclined surface 42 having a spiral groove 41 is formed. The outer peripheral surface is formed by a fluid extrusion collar 50 in which a circular groove 43 and a vertical plane dam 44 are formed at the inner diameter side end of the spiral groove 41, and a tapered spiral groove 51 is formed on the outer peripheral surface thereof. Covered.

The spiral groove 41 of the first sealing ring 40 is processed into a tapered shape that extends from the inner diameter side toward the outer diameter side, and the circular groove 43 and the vertical plane dam 44 prevent fluid leakage to the inner diameter side. .

The fluid extrusion collar 50 may seal various foreign substances (eg, dust, particles, sludge, etc.) contained in the sealed inner fluid A between the first seal sheet 30 and the first sealing ring 40. It serves to primarily block the flow into the gap, and is fixed to the rotating shaft 21 by the sleeve 26 and the snap ring 28 in contact with the first seal sheet 30 and the first sealing ring 40 It is fixed.

The second seal sheet 30a of the auxiliary sealing device has a lubrication inclined surface 32a having a lubrication tool 31a formed on the inner diameter side thereof.

The second sealing ring 40a of the auxiliary sealing device is in sliding motion with the lubricating inclined surface 32a of the second seal sheet 30a on the outer diameter side and the spiral groove 41 of the first sealing ring 40. A spiral inclined surface 42a is formed in which a reverse spiral groove 41a is formed, and a circular groove 43a is formed at the outer diameter side end of the spiral groove 41a.

The second sealing ring 40a is fixed to the rotating collar 27 and the sleeve 26 fixed to the rotating shaft 21.

The reverse spiral groove 41a of the second sealing ring 40a is processed into a tapered shape that becomes wider from the outer diameter side toward the inner diameter side, and the spiral groove 41a prevents fluid leakage to the outer diameter side.

By the above configuration, the mechanical plane sealing device 20 of the fluid membrane lubrication method according to the present invention operates as follows.

When the rotating shaft 21 rotates in a constant direction, the sealed inner fluid A of the fluid machine fastened to the machine plane sealing device 20 causes the first seal sheet 30 and the first sealing ring having a low pressure. The phenomenon of entering into the gap between the 40 occurs.

At this time, as shown in Figure 2, the pumped fluid at a pressure slightly higher than the pressure of the sealed inner fluid (A) to the high pressure coolant inlet (29a) connected to the external coolant storage tank is injected, the flange 23 ) Passes through the chamber 24a formed in the space between the stop collar 24 and the lubrication port 31 of the first seal sheet 30 and flows into the spiral inclined surface 42 of the first sealing ring 40. do.

Therefore, the fluid introduced as described above exits to the outer diameter side along the spiral inclined surface 42 and the inclined spiral groove 41 of the first sealing ring 40 by centrifugal force and the first seal sheet 30. The sealed inner fluid (A) is formed on the sliding friction surface between the first sealing rings (40) as a whole and at the same time the fluid introduced due to the pressure rise of the fluid film is pushed up to the inner fluid (A) side. ) Can be completely blocked.

In particular, the contact surface pressure between the first seal sheet 30 and the first seal ring 40 is formed by the initial compressive force of the spring 22 and the fluid pressure introduced through the high pressure cooling water injection port 29a. Two pressures simultaneously act on the helical inclined surface 42 of the first seal ring 40 to generate an axial sealing force to more completely block the leakage of the internal fluid A. The first seal The internal fluid A, which contains foreign matter, is discharged by the ejection pressure of the fluid film formed on the sliding friction surface between the sheet 30 and the first sealing ring 40. The sliding frictional surface can be protected from foreign matter since it is far from the gap between 40).

In conclusion, the mechanical plane sealing device 20 of the fluid membrane lubrication method according to the present invention, the first seal is a variety of foreign matter mixed in the inner fluid (A) sealed by the fluid extrusion collar 50 first A sliding friction between the first seal sheet 30 and the first sealing ring 40 is prevented from entering the sealing gap by moving away from the sealing gap between the seat 30 and the first sealing ring 40. In order to prevent surface abrasion or heat damage, pure sealing water fluid enters into the sealed inner fluid A while forming a fluid film by centrifugal force in the sealing gap to completely block leakage of the fluid. .

On the other hand, the fluid introduced to pass through the lubrication port 31 of the first seal sheet 30 to form a fluid film as described above, the spiral inclined surface 42 of the first sealing ring 40 and the inclined spiral groove 41. While exiting to the outer diameter side, only a small portion of the first seal sheet 30 and the first seal ring 40 tries to leak along the inner diameter side of the gap.

However, the fluid to be leaked along the inner diameter side of the gap between the first seal sheet 30 and the first seal ring 40 is primarily a vertical plane dam with the circular groove 43 of the first seal ring 40. Blocked by (44) again to exit to the outer diameter side along the inclined spiral groove 41, over the circular groove 43 and the vertical plane dam 44, the stationary collar 24 and the sleeve 26 The fluid that is about to leak into the atmosphere B along the gap between the gaps) is completely sealed off by the secondary sealing device.

In fact, it is intended to leak through the circular groove 43 and the vertical plane dam 44 of the first seal ring 40 to the air B along the gap between the stop collar 24 and the sleeve 26. After the fluid is injected through the low pressure cooling water injection port 29b as shown in FIG. 2, the fluid passes through the lubrication port 31a of the second seal sheet 30a to form a spiral inclined surface of the second sealing ring 40a ( The stop collar together with the fluid flowing into 42a and exiting the outer diameter side of the second seal ring 40a along the spiral groove 41a inclined in a reverse direction with respect to the spiral groove 41 of the first seal ring 40. The mixture fluid is mixed in the space between the 24 and the sleeve 26, and then the mixed fluid is installed outside the machine plane sealing device 20 of the present invention through an outlet 24b formed by processing the stop collar 24. Drain to the coolant storage tank.

That is, even a small amount of fluid leaked along the inner diameter side of the gap between the first sealing sheet 30 and the first sealing ring 40 of the main sealing device is the reverse spiral of the second sealing ring 40a of the secondary sealing device. After flowing into the inner space between the stop collar 24 and the sleeve 26 without being leaked to the outside by the centrifugal force due to the rotation of the groove (41a), and mixed with the fluid injected through the low pressure cooling water inlet (29b) It is circulated to the cooling water storage tank through the outlet 24b and is completely sealed.

As described above, the mechanical plane seal device of the fluid membrane lubrication method according to the present invention uses two seal seats and two seal rings capable of forcibly forming a fluid membrane on the sliding friction surface. A fluid is formed on the sliding friction surface because a main sealing device in direct contact with the internal fluid and an auxiliary sealing device for assisting the main sealing device are formed, and the sealing of the main sealing device is covered with a fluid extrusion collar. The lubrication of the membrane not only completely blocks leakage of the sealed internal fluid of the fluid machine, but also minimizes the frictional heat generated in the sliding friction surface.

What has been described above is just one embodiment for implementing a mechanical plane sealing device of the fluid membrane lubrication method according to the present invention, the present invention is not limited to the above embodiment, it is claimed in the utility model registration claims below Without departing from the gist of the present invention to those of ordinary skill in the field to which the present invention belongs, it will be said that the technical spirit of the present invention to the extent that various changes can be carried out.

Claims (1)

The sealing device in contact with the seal seat fixed to the rotating shaft performs sliding frictional motion by the rotational force of the rotating shaft and the spring force applied in the axial direction, thereby preventing the internal fluid sealed in the fluid machine from leaking to the atmosphere. In a machine flat seal device, The sealing device, Sliding friction with the lubrication inclined surface 32 and the lubrication inclined surface 32 of the first seal sheet 30 on the outer diameter side, and the lubricated inclined surface 32 with the lubrication tool 31 formed on the inner diameter side. A spiral inclined surface 42 having a spiral groove 41 is formed therein, and a circular groove 43 and a vertical plane dam 44 are formed at an inner diameter side end of the spiral groove 41, and a taper is formed on an outer circumferential surface thereof. A main sealing device composed of a first sealing ring 40 whose outer peripheral surface is covered by a fluid extrusion collar 50 having a spiral groove 51 formed therein, and The second seal sheet 30a having the lubricating inclined surface 32a having the lubricating hole 31a formed on the inner diameter side and the lubricating inclined surface 32a of the second seal sheet 30a on the outer diameter side performs sliding friction movement. A spiral inclined surface 42a having a reverse spiral groove 41a is formed with respect to the spiral groove 41 of the one sealing ring 40, and a circular groove 43a is formed at the outer diameter side end of the spiral groove 41a. Mechanical membrane sealing device of the fluid film lubrication method, characterized in that the secondary sealing device consisting of a second sealing ring (40a).