A sealing structure of an axial end face of a turn machine

Abstract

The application relates to the technical field of axial end face sealing of rotating machine equipment, in particular to a sealing structure of an axial end face of rotating machine equipment, which comprises an original equipment rotating shaft, an end cover, a flow guide platform, an inner baffle, and an outer baffle. An annular groove and a gas pressure flow channel are arranged in the end cover and are communicated with installation through holes. A plurality of backflow holes one are arranged in the inner end of the end cover and are communicated with the groove. Positioning screw holes are arranged on the groove wall. The positioning screw holes are fixed with positioning screws. A sealing main body is arranged in the groove. The sealing main body seals the original equipment rotating shaft and the inner end of the end cover. An external pressure pipe is connected to the gas pressure flow channel. An adjusting valve and a pressure gauge are arranged on the external pressure pipe. The application can effectively prevent the external sealed medium from entering the interior and prevent the internal sealed medium from leaking to the exterior, so that the rotating machine equipment can be stably operated for a long time, and the operation cost of the rotating machine equipment is reduced.

Description

Technical Field

[0001] This invention relates to the field of axial end face sealing technology for rotating equipment, specifically a sealing structure for the axial end face of rotating equipment. Background Technology

[0002] Currently, many rotating equipment require leak-proof sealing devices at the axial end face of the casing to prevent lubricating oil leakage. These typically include comb-tooth seals and rubber oil seals. These seals are "line" seals with very small sealing surfaces. If the sealing surface is enlarged, the sealing surfaces cannot be properly lubricated, causing a rapid rise in temperature. Since there is no heat dissipation function between the seals, the seal body is easily burned out. Furthermore, after a period of operation, the seal body is prone to wear. This wear is not compensated for, leading to an increased gap between the sealing surface and the seal body. The sealed medium will leak out through these gaps, affecting not only the environment but also causing ground and air pollution. In some rotating equipment, high-temperature steam is present outside the sealing device during operation, while the casing is under negative pressure. This negative pressure draws the high-temperature steam into the casing through the gaps in the seal body, causing the lubricating oil inside to have excessive water content. External debris can also enter the rotating equipment through these gaps, causing pollution. There is no good solution to this problem in the industry; the only recourse is frequent oil filtration and seal replacement, which seriously affects the safe operation and economic efficiency of the unit.

[0003] Furthermore, the seals in this type of structure lack self-lubrication and cannot compensate for wear after being worn. When external gases that are detrimental to equipment operation enter the sealed cavity, they will adversely affect the rotating equipment, preventing it from operating continuously for a long period of time. Leaks will also occur after a period of operation. Each time a leak occurs, a new seal must be replaced. Each replacement requires the removal of all seals and the installation of new ones, which is time-consuming and labor-intensive, increasing the operating costs of the rotating equipment. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned shortcomings by providing a sealing structure for the axial end face of a rotating equipment, which can effectively prevent the external sealed medium from entering the interior and also prevent the internal sealed medium from leaking to the outside, enabling the rotating equipment to operate stably for a long time and reducing the operating cost of the rotating equipment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A sealing structure for the axial end face of a rotating equipment includes an original equipment shaft rotatably mounted on the housing of the rotating equipment, an end cover mounted on the housing, a guide platform at the inner end of the end cover, an inner baffle at the inner end of the guide platform, and an outer baffle fixed at the outer end of the end cover. The original equipment shaft is rotatably mounted on the end cover and the outer baffle. The end cover and the outer baffle have mounting through holes for mounting the original equipment shaft. The end cover has an annular groove and a pneumatic flow channel communicating with the mounting through holes. The inner end of the end cover has multiple return holes communicating with the groove. Positioning screw holes are provided on the groove wall for fixing positioning screws. A sealing body is provided in the groove, sealing the original equipment shaft to the inner end of the end cover. The air inlet of the pneumatic flow channel is connected to an external pressure pipe, which is equipped with a regulating valve and a pressure gauge.

[0007] Furthermore, the inner end of the end cap is provided with a circular groove, and the inner sidewall of the circular groove is connected to the first reflux hole through the second reflux hole; the sealing body includes multiple arc-shaped sealing blocks, the ends of the arc-shaped sealing blocks are provided with interlocking interfaces, adjacent arc-shaped sealing blocks are connected to each other through interlocking interfaces, the arc-shaped sealing blocks are provided with at least one positioning hole, the positioning screw is inserted into the positioning hole to prevent the sealing body from rotating around the original equipment shaft, and the inner arc surface of the arc-shaped sealing block is provided with multiple self-lubricating heat dissipation pits, and lubricant is provided in the self-lubricating heat dissipation pits.

[0008] Furthermore, with the axis of the original equipment shaft as the center, multiple springs 1 are set at equal angles on the outer diameter surface of the arc-shaped sealing block, and springs 2 are sleeved on the positioning screw. The two ends of spring 1 abut against the inner sidewall of the groove and the arc-shaped sealing block. The restoring force generated between spring 1 and the inner sidewall of the groove forms a radial force, making the inner arc surface of the arc-shaped sealing block close to the original equipment shaft. The two ends of spring 2 abut against the outer end face of the groove and the outer end face of the arc-shaped sealing block. The restoring force of spring 2 forms an axial force, making the inner end face of the arc-shaped sealing block close to the inner end face of the groove.

[0009] Furthermore, the air pressure channel includes a pressure equalization cooling chamber located near the outer end of the end cap, a flow guide chamber formed between the end cap and the outer baffle, a pressure equalization plate used to separate the pressure equalization cooling chamber and the flow guide chamber, a plurality of pressure equalization holes for the pressure equalization cooling chamber and the flow guide chamber provided on the pressure equalization plate, and an external pressure interface radially provided on the pressure equalization cooling chamber, the external pressure interface being connected to an external pressure pipe.

[0010] Furthermore, the air outlet of the flow guide chamber is inclined toward the outer end of the end cap.

[0011] Furthermore, the diameter of the mounting through hole gradually decreases from the outer end of the groove outwards.

[0012] Furthermore, a pressure-balancing channel communicating with the inner end of the end cap is provided on the side of the end cap, and a pressure-balancing pipe communicating with the pressure-balancing channel is provided on the outside of the rotating equipment housing, with a pressure-balancing filter screen on it.

[0013] A method for using a sealing structure on the axial end face of a rotating equipment, characterized by comprising the following steps:

[0014] Step 1: Connect the external pressure pipe containing pressurized gas to the external pressure interface;

[0015] Step 2: The rotating equipment starts to run. Since the sealing body is made up of multiple interlocking interfaces on the arc-shaped sealing blocks, the radial and axial pressures make the arc-shaped sealing blocks and the sealing surfaces and groove ends of the original equipment shaft come into close contact, achieving gapless operation. This prevents the sealed medium from entering between the original equipment shaft and the sealing surface of the sealing body. The sealed medium, after being blocked, returns to the original equipment housing through the return hole, preventing leakage of the sealed medium.

[0016] Step 3: The external pressurized gas is introduced into the external pressure interface and the pressure equalization cooling chamber through the external pressure pipe, regulating valve and pressure gauge. It enters the guide chamber evenly through multiple pressure equalization holes on the pressure equalization plate. The guide chamber is guided by the installation through hole to form a directional outward pressurized gas, preventing the external sealed medium from entering the interior.

[0017] Step 4: During the long-term use of the equipment, the pressure acting on the sealing body is diluted through the pressure-balancing channel, pressure-balancing pipe, and pressure-balancing filter, reducing the negative effect of negative pressure on the sealing area, and cooperating with directional pressure gas to prevent the entry of external sealed media.

[0018] The beneficial effects of this invention are:

[0019] When the rotating equipment is running, most of the splashed sealing medium is caught by the inner guide platform and guided into the rotating equipment housing. A portion of the sealing medium is blocked by the inner baffle, while another portion enters the sealing body through the gap between the inner baffle and the end cover. The sealing body seals against the original equipment shaft and the end face of the sealing body makes tight contact with the groove, achieving gapless operation. This prevents the sealing medium from entering the sealing surface between the original equipment shaft and the sealing body. The blocked sealing medium returns to the original equipment housing through the return hole, preventing leakage. During operation, external pressurized gas is introduced into the pneumatic flow channel through an external pressure pipe, regulating valve, and pressure gauge. The pneumatic flow channel guides the installation through-hole, forming outward-directed pressurized gas, preventing external sealing medium from entering the interior. This invention effectively prevents external sealing medium from entering the interior and also prevents internal sealing medium from leaking out, enabling the rotating equipment to operate stably for extended periods and reducing operating costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a left view of the sealing body in this invention;

[0022] Figure 3 This is a schematic diagram of the structure between adjacent arc-shaped sealing blocks in this invention;

[0023] Figure 4 This is a left view of the equalizing plate in this invention;

[0024] Figure 5 This is a schematic diagram of the internal structure of the pressure equalizing plate in this invention;

[0025] Reference numerals: End cap 1; Guide platform 101; Mounting through hole 102; Groove 103; Positioning screw hole 1031; Air pressure flow channel 104; Pressure equalization cooling chamber 1041; Guide chamber 1042; Pressure equalization plate 1043; Pressure equalization hole 10431; External pressure interface 1044; Return hole one 105; Return hole two 1051; Circular groove 106; Pressure equalization channel 107; Pressure equalization pipe 108; Pressure equalization filter screen 109; Rotating shaft 2; Inner baffle 3; Outer baffle 4; Sealing body 5; Arc-shaped sealing block 501; Interlocking interface 502; Positioning hole 503; Positioning screw 504; Self-lubricating heat dissipation hole 505; Lubricant 506; Permanent magnet one 507; Permanent magnet two 508; External pressure pipe 6; Adjusting valve 7; Pressure gauge 8. Detailed Implementation

[0026] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0027] like Figure 1-5As shown, a sealing structure for the axial end face of a rotating machine includes a primary rotating shaft 2 rotatably mounted on the housing of the rotating machine, an end cover 1 mounted on the housing, a guide platform 101 provided at the inner end of the end cover 1, an inner baffle 3 provided at the inner end of the guide platform 101, and an outer baffle 4 fixed at the outer end of the end cover 1. The primary rotating shaft 2 is rotatably mounted on the end cover 1 and the outer baffle 4. The end cover 1 and the outer baffle 4 are provided with mounting through holes 102 for mounting the primary rotating shaft 2, and the end cover 1 is provided with a connecting mounting through hole 102. The end cap 1 has an annular groove 103 and a pneumatic flow channel 104. The inner end of the end cap 1 is provided with a plurality of return holes 105 that connect to the groove 103. The groove 103 has a positioning screw hole 1031 on its wall. The positioning screw hole 1031 is used to fix a positioning screw 504. The groove 103 has a sealing body 5. The sealing body 5 seals the original equipment shaft 2 with the inner end of the end cap 1. The air inlet end of the pneumatic flow channel 104 is connected to an external pressure pipe 6. The external pressure pipe 6 is provided with a regulating valve 7 and a pressure gauge 8.

[0028] When the rotating equipment is running, most of the splashed sealing medium is caught by the inner guide plate 101 and guided into the rotating equipment housing. A portion of the sealing medium is blocked by the inner baffle 3, while another portion enters the sealing body 5 through the gap between the inner baffle 3 and the end cover 1. The sealing body 5 seals against the original equipment shaft 2, and the sealing body 5 makes tight contact with the end face of the groove 103, achieving gapless operation. This prevents the sealing medium from entering the sealing surface between the original equipment shaft 2 and the sealing body 5. The blocked sealing medium flows back along the... Hole 105 returns to the original equipment housing, preventing leakage of the sealed medium. During operation, the external pressurized gas is introduced into the pneumatic flow channel 104 through the external pressure pipe 6, regulating valve 7, and pressure gauge 8. The pneumatic flow channel 104 guides the installation through hole 102, forming outward-directed pressurized gas to prevent the external sealed medium from entering the interior. This invention effectively prevents the external sealed medium from entering the interior and also prevents the internal sealed medium from leaking to the outside, enabling the rotating equipment to operate stably for a long time and reducing the operating cost of the rotating equipment.

[0029] like Figure 1-5As shown, the inner end of the end cap 1 is provided with a circular groove 106, and the inner sidewall of the circular groove 106 is connected to the first return hole 105 through the second return hole 1051; the sealing body 5 includes multiple arc-shaped sealing blocks 501, the ends of the arc-shaped sealing blocks 501 are provided with interlocking interfaces 502, and adjacent arc-shaped sealing blocks 501 are connected to each other through the interlocking interfaces 502. The arc-shaped sealing blocks 501 are provided with at least one positioning hole 503, and the positioning screw 504 is inserted into the positioning hole 503 to prevent the sealing body 5 from rotating around the original equipment shaft 2. The inner arc surface of the arc-shaped sealing block 501 is provided with multiple self-lubricating heat dissipation pits 505, and lubricant 506 is provided in the self-lubricating heat dissipation pits 505. The inner arc surface of the arc-shaped sealing block 501 rotates and seals with the outer sidewall of the original equipment shaft 2; in this embodiment, since the sealing body 5 is composed of multiple arc-shaped sealing blocks 501 The interlocking interfaces 502 interlock with each other, and through the action of radial and axial forces, the sealing body 5 and the sealing surface of the original equipment shaft 2 and the end face of the groove 103 are in close contact, achieving gapless operation. This prevents the sealed medium from entering between the sealing surfaces of the original equipment shaft 2 and the sealing body 5. The sealed medium, after being blocked, returns to the original equipment housing through the return hole 105, preventing leakage of the sealed medium. Furthermore, under the action of the positioning screw 504, the sealing body 5 will not rotate with the rotation of the original equipment shaft 2. Under the action of the lubricant 25, a lubricating oil film is generated between the sealing surfaces of the sealing body 5 and the sealing surface of the original equipment shaft 2 when they rotate, so the wear between the sealing surfaces is very small. At the same time, the self-lubricating heat dissipation holes 24 play a role in heat dissipation between the sealing surfaces. The sealing medium entering the circular groove 106 can also return to the original equipment housing through the return hole 2 1051 and the return hole 105.

[0030] like Figure 1-5As shown, multiple springs 507 are evenly spaced on the outer diameter surface of the arc-shaped sealing block 501, centered on the axis of the original equipment shaft 2. Springs 508 are fitted onto the positioning screw 504. The two ends of springs 507 abut against the inner wall of the corresponding groove 103 and the arc-shaped sealing block 501. The restoring force generated between springs 507 and the inner wall of the corresponding groove 103 forms a radial force, causing the inner arc surface of the arc-shaped sealing block 501 to approach the original equipment shaft 2. The two ends of springs 508 abut against the outer end face of the groove 103 and the outer end face of the arc-shaped sealing block 501. The restoring force of springs 508 forms an axial force, causing the inner arc surface of the arc-shaped sealing block 501 to... The inner end face of 1 is close to the inner end face of the groove 103. In this embodiment, when in use, both spring 1 507 and spring 2 508 are in a compressed state. The restoring force of spring 1 507 forms a radial force, which makes the inner arc surface of the arc-shaped sealing block 501 close to the original equipment shaft 2. The restoring force of spring 2 508 forms an axial force, which makes the inner end face of the arc-shaped sealing block 501 close to the inner end face of the groove 103. Under the action of radial and axial forces, the sealing body 5 is in close contact with the sealing surface of the original equipment shaft 2 and the inner end face of the groove 103, achieving gapless operation and preventing the sealed medium from entering between the sealing surface of the original equipment shaft 2 and the sealing body 5.

[0031] like Figure 1-5 As shown, the air pressure channel 104 includes a pressure equalization cooling chamber 1041 located near the outer end of the end cap 1, a flow guide chamber 1042 formed between the end cap 1 and the outer baffle 4, and a pressure equalization plate 1043 separating the pressure equalization cooling chamber 1041 and the flow guide chamber 1042. The pressure equalization plate 1043 is provided with multiple pressure equalization holes 10431 for the pressure equalization cooling chamber 1041 and the flow guide chamber 1042. An external pressure interface 1044 is radially arranged on the pressure equalization cooling chamber 1041. The pressure interface 1044 is connected to the external pressure pipe 6. In this embodiment, when the rotating equipment is running, the external pressure gas is introduced into the external pressure interface 1044 and the pressure equalization cooling chamber 1041 through the external pressure pipe 6, the regulating valve 7, and the pressure gauge 8. The gas then enters the guide chamber 1042 evenly through multiple pressure equalization holes 10431 on the pressure equalization plate 1043. The gas is then guided through the installation through hole 102 in the guide chamber 1042 to form outward-directed pressure gas, preventing the external sealed medium from entering the interior.

[0032] like Figure 1-5 As shown, the outlet end of the flow guide chamber 1042 is inclined toward the outer end of the end cover 1; in this embodiment, when the outlet end of the flow guide chamber 1042 is inclined toward the outer end of the end cover 1, the flow guide chamber 1042 can better guide the pressurized gas outward.

[0033] like Figure 1-5As shown, the diameter of the mounting through hole 102 gradually decreases from the outer end of the groove 103 outwards; in this embodiment, when the diameter of the mounting through hole gradually decreases from the outer end of the groove 103 outwards, pressurized gas is less likely to enter the groove 103 through the mounting through hole 102.

[0034] like Figure 1-5 As shown, the side of the end cap 1 is provided with a pressure-balancing channel 107 that connects to the inner end of the end cap 1, and the outer shell of the rotating equipment is provided with a pressure-balancing pipe 108 that connects to the pressure-balancing channel 107, and a pressure-balancing filter screen 109 is provided on it; In this embodiment, when there is negative pressure inside the equipment shell, the pressure acting on the seal will be diluted through the pressure-balancing channel 107, the pressure-balancing pipe 108, and the pressure-balancing filter screen 109, thereby reducing the negative effect of the negative pressure on the seal, and cooperating with the directional pressure gas to prevent the entry of the external sealed medium.

[0035] like Figure 1-5 As shown, a method for using a sealing structure on the axial end face of a rotating equipment is characterized by comprising the following steps:

[0036] Step 1: Connect the external pressure pipe 6, which is connected to pressurized gas, to the external pressure port 1044;

[0037] Step 2: The rotating equipment starts to run. Since the sealing body 5 is made up of multiple arc-shaped sealing blocks 501 with interlocking interfaces 502, and then the sealing body 5 is in close contact with the sealing surface of the original equipment rotating shaft 2 and the end face of the groove 103 by the action of radial force and axial force, it achieves gapless operation, which prevents the sealed medium from entering between the sealing surface of the original equipment rotating shaft 2 and the sealing body 5. The sealed medium after being blocked returns to the original equipment housing through the return hole 105, preventing the leakage of the sealed medium.

[0038] Step 3: The external pressurized gas is introduced into the external pressure port 1044 and the pressure equalization cooling chamber 1041 through the external pressure pipe 6, regulating valve 7, and pressure gauge 8. It then enters the guide chamber 1042 evenly through multiple pressure equalization holes 10431 on the pressure equalization plate 1043. The gas is then guided through the installation through hole 102 in the guide chamber 1042 to form a directional outward pressurized gas, preventing the external sealed medium from entering the interior.

[0039] Step 4: During the long-term use of the equipment, the pressure acting on the sealing body 5 is diluted through the pressure-balancing channel 107, pressure-balancing pipe 108, and pressure-balancing filter 109, reducing the negative effect of negative pressure on the sealing area, and cooperating with directional pressure gas to prevent the entry of external sealed media.

[0040] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the scope defined by the spirit of the invention.

Claims

1. A sealing structure for the axial end face of a rotating equipment, characterized in that: The system includes a rotating shaft (2) rotatably mounted on the housing of the rotating equipment, an end cover (1) mounted on the housing, a guide platform (101) at the inner end of the end cover (1), an inner baffle (3) at the inner end of the guide platform (101), an outer baffle (4) fixed at the outer end of the end cover (1), the rotating shaft (2) rotatably mounted on the end cover (1) and the outer baffle (4), an installation through hole (102) for mounting the rotating shaft (2) is provided in the end cover (1) and the outer baffle (4), and an annular groove (103) communicating with the installation through hole (102) is provided in the end cover (1). The air pressure channel (104) has multiple return holes (105) connected to the groove (103) at the inner end of the end cap (1). The groove (103) has a positioning screw hole (1031) on its wall. The positioning screw hole (1031) is used to fix a positioning screw (504). The groove (103) has a sealing body (5) inside it. The sealing body (5) seals the original equipment shaft (2) with the inner end of the end cap (1). The air inlet of the air pressure channel (104) is connected to an external pressure pipe (6). The external pressure pipe (6) is equipped with a regulating valve (7) and a pressure gauge (8).

2. The sealing structure for the axial end face of a rotating equipment according to claim 1, characterized in that, The inner end of the end cap (1) is provided with a circular groove (106), and the inner sidewall of the circular groove (106) is connected to the first return hole (105) through the second return hole (1051); the sealing body (5) includes multiple arc-shaped sealing blocks (501), the ends of the arc-shaped sealing blocks (501) are provided with interlocking interfaces (502), and adjacent arc-shaped sealing blocks (501) are interlocked with each other through the interlocking interfaces (502). The arc-shaped sealing blocks (501) are provided with at least one positioning hole. (503) The positioning screw (504) prevents the sealing body (5) from rotating around the original equipment shaft (2) by inserting the positioning hole (503). The inner arc surface of the arc-shaped sealing block (501) is provided with multiple self-lubricating heat dissipation holes (505). The self-lubricating heat dissipation holes (505) are provided with lubricant (506). When the positioning screw (504) tightens the positioning hole (503) and the bottom of the circular groove (106), the end face of the arc-shaped sealing block (501) and the groove (103) abuts together.

3. The sealing structure for the axial end face of a rotating equipment according to claim 2, characterized in that, Multiple springs (507) are set at equal angles on the outer diameter surface of the arc-shaped sealing block (501) with the axis of the original equipment shaft (2) as the center. Springs (508) are sleeved on the positioning screw (504). The two ends of springs (507) abut against the inner wall of the groove (103) and the arc-shaped sealing block (501). The restoring force generated between springs (507) and the inner wall of the groove (103) forms a radial force, so that the inner arc surface of the arc-shaped sealing block (501) is close to the original equipment shaft (2). The two ends of springs (508) abut against the outer end face of the groove (103) and the outer end face of the arc-shaped sealing block (501). The restoring force of springs (508) forms an axial force, so that the inner end face of the arc-shaped sealing block (501) is close to the inner end face of the groove (103).

4. The sealing structure for the axial end face of a rotating equipment according to claim 1, characterized in that, The air pressure channel (104) includes a pressure equalization cooling chamber (1041) located near the outer end of the end cap (1), a flow guide chamber (1042) formed between the end cap (1) and the outer baffle (4), a pressure equalization plate (1043) used to separate the pressure equalization cooling chamber (1041) and the flow guide chamber (1042), a plurality of pressure equalization holes (10431) connected to the pressure equalization cooling chamber (1041) and the flow guide chamber (1042) are provided on the pressure equalization plate (1043), and an external pressure interface (1044) is radially provided on the pressure equalization cooling chamber (1041), and the external pressure interface (1044) is connected to an external pressure pipe (6).

5. The sealing structure for the axial end face of a rotating equipment according to claim 4, characterized in that, The air outlet of the flow chamber (1042) is inclined toward the outer end of the end cap (1).

6. The sealing structure for the axial end face of a rotating equipment according to claim 1, characterized in that, The diameter of the mounting through hole (102) gradually decreases from the outer end of the groove (103) outwards.

7. The sealing structure for the axial end face of a rotating equipment according to claim 1, characterized in that, The side of the end cap (1) is provided with a pressure channel (107) that connects to the inner end of the end cap (1), and the outside of the rotating equipment housing is provided with a pressure pipe (108) that connects to the pressure channel (107), and a pressure filter screen (109) is provided on it.

Images