An online adjustable gap carbon ring seal

Abstract

An online adjustable-gap carbon ring seal comprises a housing assembly, comprising a bearing housing side housing, several intermediate housings, and a casing side housing. The housing assembly is fixedly mounted within the compressor casing, with a sleeve passing through the inner bore of the housing assembly, fitted over the outer diameter of the compressor main shaft, and locked by a locking nut. The bearing housing side housing, several intermediate housings, and casing side housing are machined with grooves and air nozzle holes that match the carbon ring-embedded air seal assembly. The carbon ring-embedded air seal assembly is mounted within the grooves within the bearing housing side housing, several intermediate housings, and casing side housing. The air nozzle on the carbon ring-embedded air seal assembly passes through the air nozzle hole and its end is connected to the air intake and exhaust assembly. The several air intake and exhaust assemblies are connected to the air filling and exhaust system. This type of carbon ring seal can adjust the gap between the carbon ring inner bore and the sleeve without stopping the compressor during operation, based on the internal vacuum level of the compressor, to ensure the vacuum level required for the test and prevent lubricating oil in the bearing housing from entering the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing, and in particular relates to an online adjustable gap carbon ring seal. Background Art

[0002] Centrifugal compressors are a type of turbine compressor. After assembly, the compressor undergoes a mechanical run test lasting at least four hours. Some new products also require performance testing. Vibration, temperature, first-order critical speed, seal leakage, and other indicators must meet the test run outline requirements before they can be released from the factory. Mechanical run tests are divided into two types: open-circuit and vacuum tests. The open-circuit test involves installing a throttle orifice at the compressor inlet and routing the outlet piping outside the factory. The vacuum test involves testing the compressor's mechanical run under vacuum conditions inside the casing. This involves blinding the compressor's inlet flange, installing a negative pressure vacuum gauge, connecting the outlet flange to a vacuum line, and running a vacuum pump to evacuate the compressor. The test can only be performed when the vacuum pressure inside the casing reaches above -0.08 MPa. The costs and time associated with these two test options vary significantly, including the electricity costs associated with compressor power consumption, the fabrication and construction costs of the test piping, and the depreciation of the test equipment. For vacuum testing, a blind flange can be installed on the main engine air outlet, without the need for large pipelines, and the motor power is small. For open testing, the test pipeline connected to the main engine air outlet must be led out of the factory. Large compressors are large equipment with thick and long pipelines, and the manufacturing and construction layout costs are high. The motor power is more than ten times that of the vacuum test motor. The motor depreciation, pipeline layout, labor costs, and the power consumption of the entire test process are much higher than the vacuum test. The total cost of the two test methods is several hundred thousand yuan, and for large compressors, the difference is even more than one million yuan. The premise of using a vacuum test is that the unit must have good sealing, especially the shaft end test seal position must achieve no leakage or minimal leakage, so that a sufficient vacuum degree can be established and maintained constant during the unit test. Among existing seals, dry gas seals offer the best sealing performance. However, they require an air film to form on the sealing surface during operation. However, dry gas seals cannot form an air film on the sealing surface under negative pressure conditions inside the casing. Therefore, dry gas seals cannot be used for vacuum testing of centrifugal compressors. Currently, carbon ring seals and comb seals are used for shaft end seals during vacuum testing. Both of these seals have fixed gaps, resulting in large gaps and high leakage. This makes it difficult to maintain a sufficient vacuum during long-term compressor operation. Furthermore, lubricating oil in the bearing housing can also flow into the casing along the main shaft under the action of the vacuum suction force inside the compressor. As the unit operates, especially in the second half of the test, if the vacuum inside the casing cannot be maintained or decreases, friction between the compressor rotor and the air leaking into the compressor causes thermal expansion, leading to axial and radial elongation of the rotor. Long-term operation can cause thermal deformation of the partition plate and seal, rotor lock, and wear of important components such as the impeller. Furthermore, poor sealing results in the compressor ingesting a large amount of lubricating oil along the shaft end. The high-temperature air causes sparks to form when the seal rubs against the rotor, potentially leading to combustion or even explosion.Therefore, it is urgent to design a new type of shaft end test seal that can adjust the gap between the seal and the rotor to the minimum value at any time when the equipment is operating normally without stopping, so as to ensure that a vacuum degree that meets the test requirements can be established inside the equipment and prevent the lubricating oil in the bearing box from entering the equipment, in order to replace the traditional sealing form. Summary of the Invention

[0003] The purpose of the present invention is to provide an online adjustable gap carbon ring seal, which can adjust the gap between the inner hole of the carbon ring and the shaft sleeve according to the internal vacuum level of the compressor without stopping the compressor during operation, so as to ensure the vacuum level required by the test and prevent the lubricating oil in the bearing box from entering the equipment.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] An online adjustable gap carbon ring seal includes a housing assembly, a plurality of carbon ring-embedded inflatable seal ring assemblies, a shaft sleeve, a locking nut, a plurality of air intake and exhaust assemblies, and an air filling and deflation system;

[0006] The housing assembly includes a bearing box side housing, several intermediate housings and a casing side housing. The housing assembly is fixedly installed in the compressor housing. The sleeve passes through the inner hole of the housing assembly and is mounted on the outer circle of the compressor main shaft and is locked by a locking nut to ensure that it does not move. The bearing box side housing, several intermediate housings and the casing side housing are processed with grooves and air nozzle holes that match the carbon ring-embedded air sealing ring assembly; the carbon ring-embedded air sealing ring assembly includes an air nozzle, a sealing ring and several carbon ring assemblies. An air charging cavity is provided on the sealing ring, and the air charging and discharging holes of the air charging cavity are connected to the air nozzle. A carbon ring assembly is installed at the inner hole of the sealing ring. The carbon ring-embedded air sealing ring assembly is installed in the grooves in the bearing box side housing, several intermediate housings and the casing side housing. The air nozzle passes through the air nozzle hole and the end is connected to the air intake and exhaust assembly, and several air intake and exhaust assemblies are connected to the air charging and discharging system.

[0007] The bearing box side shell is processed with an oil guide groove close to the bearing box side.

[0008] The inner holes of the bearing box side housing, the plurality of intermediate housings and the casing side housing and the matching sections with the outer circle of the shaft sleeve are processed with comb teeth seals.

[0009] The bearing box side shell is processed with a light hole near the bearing box side; the outer circle of the locking nut is processed with a spiral groove, and the spiral groove cooperates with the front end light hole section of the bearing box side shell to form a spiral seal.

[0010] The front end of the groove of the bearing box side shell matching the sealing ring is processed with a balancing air hole, and comb seals are processed on both sides of the balancing air hole, and the balancing air hole is connected to the atmosphere.

[0011] The cross-sectional shape of the grooves processed in the bearing box side shell, the intermediate shell and the casing side shell to match the carbon ring inflatable sealing ring assembly is one or a combination of arc, square, inverted trapezoid, regular trapezoid, octagon, flat-roofed house shape, triangle, pointed-roofed house shape or convex shape.

[0012] The inner hole of the sealing ring is provided with several rows of grooves, and several rubber partitions are evenly distributed in each row of grooves. Each row of rubber partitions are staggered or not staggered. The rubber partitions divide each groove into several groove units. Bosses are provided at both ends of the inner hole side of the groove. Each group of carbon ring assemblies is composed of several carbon rings. The inner hole side of the carbon ring is processed with a card groove that matches the boss of the inner hole of the sealing ring. A carbon ring is installed in each groove unit. The carbon ring is wrapped in the groove of the sealing ring, and the carbon ring can be ensured not to fall off under the obstruction of the boss.

[0013] The cross section of the air-filled cavity is one or a combination of the following shapes: arc, square, inverted trapezoid, regular trapezoid, octagon, flat-roofed house shape, triangle, pointed-roofed house shape or convex shape.

[0014] The inflation and deflation system consists of an air source, a pressure reducing valve, two valve groups, inlet and exhaust pipelines and a pressure gauge. The isolation valve in the two valve groups is connected to the pressure gauge, and the discharge valve in the two valve groups is connected to the atmosphere, wherein the isolation valve is normally open and the discharge valve is normally closed; the air source, pressure reducing valve, two valve groups and each group of inlet and exhaust components are connected by inlet and exhaust pipelines.

[0015] Beneficial effects of the present invention:

[0016] 1. The gap between each group of carbon ring components and the outer circle of the sleeve can be adjusted at any time by inflating and deflating the sealing ring. Before the equipment is operated, the sealing ring is inflated, and the carbon ring is tightly clamped on the outer circle of the sleeve under the push of the sealing ring to achieve zero gap. High vacuum can be established very quickly in the compressor, which can reduce the equipment startup preparation time; when the equipment is ready to start, a small amount of gas in the sealing ring is released, and the gas pressure in the sealing ring is reduced. The gap between the inner hole of the sealing ring and the outer circle of the sleeve changes from a zero gap locked state to a small gap; after the equipment is operated, the gas pressure in the sealing ring can be adjusted at any time according to the change of the vacuum degree of the equipment to achieve the purpose of changing the sealing gap. Even if the carbon ring wears and the gap increases, there is no need to stop the machine for replacement and maintenance. Compared with other gap seals, the adjustable gap carbon ring seal has a smaller gap, the least leakage, more flexible operation, and more stable and reliable operation.

[0017] 2. A spiral seal is set at the front end of the seal, and a balancing air hole is set behind the spiral seal. The spiral seal pushes the lubricating oil outward, and the balancing air hole is connected to the atmospheric balance vacuum to reduce the pressure difference before and after the spiral seal, and reduce the suction force of the vacuum in the compressor on the atomized oil and gas in the bearing box. The combination of the two can effectively prevent the lubricating oil sprayed from the bearing box from entering the compressor.

[0018] 3. The inner hole of the shell assembly is processed with comb teeth seal, which extends the sealing length without affecting the function and strength of the entire shell structure.

[0019] 4. The bearing box side of the bearing box shell is processed with an oil guide groove. The atomized oil and gas in the bearing box adhere to the surface of the bearing box shell, converge into the oil guide groove and are then diverted to the bottom for discharge, effectively reducing the amount of lubricating oil entering the seal along the gap between the shell and the locking nut, and reducing the oil resistance pressure of the spiral seal.

[0020] 5. The pumping pressure head generated by the pumping spiral on the outer circle of the locking nut will push the lubricating oil sucked into the spiral groove by the vacuum in the compressor out of the inner hole of the bearing box side shell, and at the same time, it will generate a reverse thrust to it. This thrust can further lock the locking nut and effectively prevent it from falling off.

[0021] 6. The sealing ring is made of elastic rubber. Adjacent carbon rings in each carbon ring assembly are separated by a rubber partition. When the sealing ring is inflated, the carbon ring compresses the rubber partition, causing the inner hole to shrink. When the sealing ring is deflated, the pressure inside the sealing ring decreases, the inner hole expands, and the carbon ring inner hole also expands, and the compressed rubber partition returns to its original state. This ensures the adjustability of the carbon ring inner hole, making it possible to adjust the gap between the carbon ring inner hole and the shaft or sleeve at any time according to the vacuum level in the compressor during equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of an online adjustable gap carbon ring seal according to Example 1 of the present invention;

[0023] Figure 2 This is embodiment 1 of the present invention Figure 1 A local enlarged schematic diagram of point A;

[0024] Figure 3 This is a schematic structural diagram of a carbon ring-embedded inflatable sealing ring assembly and a rubber partition between each row of sealing rings in accordance with embodiment 1 of the present invention;

[0025] Figure 4 This is a schematic diagram of the sealing ring rubber partition structure of Example 1 of the present invention;

[0026] Figure 5 This is embodiment 1 of the present invention Figure 3 A local enlarged schematic diagram of S;

[0027] Figure 6 This is a schematic diagram of the inflation and deflation system of Example 1 of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of Example 2 of the present invention, in which the cross section of the inflation cavity is arc-shaped and the rubber partitions of each row of sealing rings are staggered;

[0029] Figure 8This is a schematic structural diagram of a sealing ring assembly having a square cross-section of the inflation chamber in Example 3 of the present invention;

[0030] Figure 9 This is a schematic structural diagram of a sealing ring assembly in which the cross section of the inflation chamber is an inverted trapezoidal shape according to embodiment 4 of the present invention;

[0031] Figure 10 This is a schematic structural diagram of a sealing ring assembly in which the cross section of the inflation chamber is a regular trapezoidal shape according to embodiment 5 of the present invention;

[0032] Figure 11 This is a schematic structural diagram of a sealing ring assembly having an octagonal cross-section of the inflation chamber in Example 6 of the present invention;

[0033] Figure 12 2. This is a schematic structural diagram of a sealing ring assembly in which the cross section of the inflation chamber is a flat-roofed house-shaped embodiment of the present invention;

[0034] Figure 13 This is a schematic structural diagram of a sealing ring assembly having a triangular cross-section of the inflation cavity according to embodiment 8 of the present invention;

[0035] Figure 14 1 is a schematic structural diagram of a sealing ring assembly in which the cross section of the inflation chamber is in the shape of a pointed roof house in Example 9 of the present invention;

[0036] Figure 15 This is a schematic structural diagram of a sealing ring assembly having a convex cross-section of the inflation chamber in embodiment 10 of the present invention;

[0037] 1-locking nut, 2-intake and exhaust assembly, 3-housing assembly, 31-bearing box side housing, 32-intermediate housing, 33-casing side housing, 311-oil guide groove, 312-balance hole, 4-carbon ring inflatable sealing ring assembly, 41-air nozzle, 42-sealing ring, 43-carbon ring assembly, 421-rubber partition, 422-groove, 423-boss, 4221-groove unit, 5-sleeve, 6-charging and discharging system, 61-two-valve group, 62-pressure gauge, 63-pressure reducing valve. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0039] Example 1

[0040] like Figures 1 to 5 As shown, an online adjustable gap carbon ring seal includes a housing assembly 3, a rubber inflatable seal ring assembly 4, a shaft sleeve 5, a locking nut 1, an air intake and exhaust assembly 2, and an air filling and deflation system 6;

[0041] The housing assembly 3 includes a bearing box side housing 31, an intermediate housing 32 and a casing side housing 33. The housing assembly 3 is fixedly installed in the compressor housing. The shaft sleeve 5 passes through the inner hole of the housing assembly 3 and is sleeved on the outer circle of the compressor main shaft and is locked by the locking nut 1 to ensure that it does not move. The bearing box side housing 31, the intermediate housing 32 and the casing side housing 33 are processed with two grooves and air nozzle holes that match the carbon ring-embedded air sealing ring assembly 4; each set of carbon ring-embedded air sealing ring assembly 4 includes an air nozzle 41, a sealing ring 42 and three sets of carbon ring assemblies 43, and the sealing ring 42 is provided with an air chamber The air filling and discharging holes of the air filling chamber are connected to the air nozzle 41, and a carbon ring assembly 43 is installed at the inner hole of the sealing ring 42. The carbon ring-embedded air filling sealing ring assembly 4 is installed in the groove in the bearing box side shell 31, the intermediate shell 32 and the casing side shell 33. The air nozzle 41 passes through the air nozzle hole and the end is connected to the air intake and exhaust assembly 2. The two groups of air intake and exhaust assemblies 2 are connected to the air filling and discharging system 6; the cross-sectional shape of the grooves processed in the bearing box side shell 31, the intermediate shell 32 and the casing side shell 33 to match the carbon ring-embedded air filling sealing ring assembly 4 is an arc shape, and the cross-sectional shape of the air filling chamber is consistent with the cross-sectional shape of the groove, which is also an arc shape.

[0042] The bearing box side shell 31 is processed with an oil guide groove 311 near the bearing box side. The lubricating oil that leaks out after being atomized in the bearing box and adheres to the outer surface of the bearing box side shell 31 flows along the outer surface of the bearing box side shell 31 to the oil guide groove 311 and is then guided to the bottom for discharge, so as to prevent the lubricating oil from entering the seal along the gap between the bearing box side shell 31 and the locking nut 1, and entering the compressor under the action of the vacuum suction inside the compressor.

[0043] The inner holes of the bearing box side housing 31, the intermediate housing 32 and the casing side housing 33 and the outer circle of the shaft sleeve 5 are matched with comb seals.

[0044] The bearing box side shell 31 is processed with a light hole near the bearing box side; the outer circle of the locking nut 1 is processed with a spiral groove, and the spiral groove cooperates with the light hole section at the front end of the bearing box side shell 31 to form a spiral seal. During the operation of the equipment, the main shaft rotates. When lubricating oil enters the spiral groove, the spiral generates a pumping pressure head for the viscous fluid filling the sealing gap, which can push the lubricating oil sucked into the spiral groove by the vacuum in the compressor out of the inner hole of the bearing box side shell 31 to prevent the lubricating oil from entering the compressor.

[0045] A balancing hole 312 is machined at the front end of the groove matching the bearing box side shell 31 and the sealing ring 42, and comb seals are machined on both sides of the balancing hole 312. The balancing hole 312 is connected to the atmosphere. Because a certain gap is left between the inner hole of the seal and the outer circle of the shaft sleeve 5, when the compressor is vacuumed, the air and lubricating oil in the bearing box will enter the equipment along the gap between the inner hole of the seal and the outer circle of the shaft sleeve 5. A balancing hole 312 is set in front of the rubber inflatable sealing ring assembly 4. When vacuuming, the gas entering from the balancing hole 312 will block the lubricating oil leaking from the bearing box to the front end of the seal from entering the seal.

[0046] The inner hole of the sealing ring 42 is provided with three rows of grooves 422, and eight rubber partitions 421 are evenly distributed in each row of grooves 422. Each row of rubber partitions 421 is arranged without staggering, and the rubber partitions 421 divide each groove 422 into eight groove units 4221. Bosses 423 are provided at both ends of the inner hole side of the groove. Each group of carbon ring assemblies 43 is composed of three carbon rings. The inner hole side of the carbon ring is processed with a card groove that matches the inner hole boss 423 of the sealing ring 42. A carbon ring is installed in each groove unit 4221, and the carbon ring is wrapped in the groove 422 of the sealing ring 42. The carbon ring can be prevented from falling under the obstruction of the boss 423.

[0047] The gas charging and discharging system 6 is composed of a gas source, a pressure reducing valve 63, two valve groups 61, an inlet and exhaust pipeline and a pressure gauge 62. The isolation valve in the two valve groups 61 is connected to the pressure gauge 62, and the discharge valve in the two valve groups 61 is connected to the atmosphere, wherein the isolation valve is normally open and the discharge valve is normally closed; the gas source, the pressure reducing valve 63, the two valve groups 61 and each group of inlet and exhaust components 2 are connected by an inlet and exhaust pipeline, such as Figure 6 As shown, in this embodiment, one end of the intake and exhaust pipeline is connected to the air source via a pressure reducing valve 63, one end is connected to a pressure gauge 62 and the atmosphere via a two-valve assembly 61, and the other end is connected to intake and exhaust assembly I and intake and exhaust assembly II, respectively. When the seal ring 42 is inflated, the pressure gauge takes pressure from the isolation valve in the two-valve assembly 61 to monitor the system pressure at all times. The discharge valve releases pressure within the seal ring 42 to adjust the gap between the carbon ring and the shaft sleeve 5 during operation.

[0048] The working process of an online adjustable gap carbon ring seal is:

[0049] When the equipment is not started, the gas source valve is opened, the gas source pressure is adjusted to the set value through the pressure reducing valve 63, and the sealing rings 42 are inflated through each group of air intake and exhaust components 2. After the sealing rings 42 are inflated, they expand, and the outer circle of the sealing ring 42 fits tightly with the grooves in the housing assembly 3. The inner hole of the sealing ring 42 pushes the carbon ring to shrink and tighten on the outer circle of the shaft sleeve 5. The expanded sealing ring 42 prevents gas from leaking into the interior of the equipment through the outer circle of the sealing ring 42, and also blocks external gas from entering the compressor through the gap between the sealing ring 42 and the outer circle of the shaft sleeve 5.

[0050] The compressor begins to evacuate. When the vacuum level inside the equipment reaches a predetermined value, the discharge valve in the two-valve group 61 opens to discharge a certain amount of air. At this time, the gap between the inner hole of the seal ring 42 and the outer circle of the shaft sleeve 5 changes from a zero-gap locked state to a gap of less than or equal to 0.03 mm. This minimizes the amount of air and lubricating oil entering the compressor while ensuring normal operation of the compressor and friction-free operation between the seal and the shaft sleeve. Because the compressor is in a vacuum, the lubricating oil that leaks after atomization in the bearing box adheres to the outer surface of the sealed bearing box side shell 31 and the gap between the lock nut 1 and the seal under the action of negative pressure. The lubricating oil adhered to the outer surface of the bearing box side shell 31 flows downward along the oil guide groove 311 to the coupling shield and is discharged. The oil that enters the gap between the lock nut 1 and the seal is pushed out of the bearing box side shell 31 by the spiral seal. A balancing hole 312 is provided behind the spiral seal to the outside. The vacuum inside the compressor preferentially draws outside air through the balancing hole 312, reducing the pressure difference before and after the spiral seal, thereby reducing the amount of lubricating oil sucked into the seal gap from the bearing box.

[0051] Example 2

[0052] like Figure 7 As shown, the difference between Example 2 and Example 1 is:

[0053] The sealing rings are arranged in a staggered manner with 421 rubber partitions in each row.

[0054] Example 3

[0055] The difference between Example 3 and Example 1 is that:

[0056] like Figure 8 As shown, the cross-sectional shape of the grooves processed in the bearing box side shell 31, the intermediate shell 32 and the casing side shell 33 to match the carbon ring inflatable sealing ring assembly 4 is square, and the cross-sectional shape of the inflation cavity is consistent with the cross-sectional shape of the groove, which is also square.

[0057] Example 3

[0058] The difference between Example 3 and Example 1 is that:

[0059] like Figure 9 As shown, the cross-sectional shape of the grooves processed in the bearing box side shell 31, the intermediate shell 32 and the casing side shell 33 to match the carbon ring inflatable sealing ring assembly 4 is an inverted trapezoid, and the cross-sectional shape of the inflation cavity is consistent with the cross-sectional shape of the groove, which is also an inverted trapezoid.

[0060] Example 4

[0061] The difference between Example 4 and Example 1 is that:

[0062] like Figure 10As shown, the cross-sectional shape of the grooves processed in the bearing box side shell 31, the intermediate shell 32 and the casing side shell 33 to match the carbon ring inflatable sealing ring assembly 4 is a regular trapezoid, and the cross-sectional shape of the inflation cavity is consistent with the cross-sectional shape of the groove, which is also a regular trapezoid.

[0063] Example 5

[0064] The difference between Example 5 and Example 1 is that:

[0065] like Figure 11 As shown, the cross-sectional shape of the grooves processed in the bearing box side shell 31, the intermediate shell 32 and the casing side shell 33 to match the carbon ring inflatable sealing ring assembly 4 is octagonal, and the cross-sectional shape of the inflation cavity is consistent with the cross-sectional shape of the groove, which is also octagonal.

[0066] Example 6

[0067] The difference between Example 6 and Example 1 is:

[0068] like Figure 12 As shown, the cross-sectional shape of the grooves processed in the bearing box side shell 31, the intermediate shell 32 and the casing side shell 33 to match the carbon ring inflatable sealing ring assembly 4 is a flat-roofed house shape, and the cross-sectional shape of the inflation cavity is consistent with the cross-sectional shape of the groove, which is also a flat-roofed house shape.

[0069] Example 7

[0070] The difference between Example 7 and Example 1 is that:

[0071] like Figure 13 As shown, the cross-sectional shape of the grooves processed in the bearing box side shell 31, the intermediate shell 32 and the casing side shell 33 to match the carbon ring inflatable sealing ring assembly 4 is triangular, and the cross-sectional shape of the inflation cavity is consistent with the cross-sectional shape of the groove, which is also triangular.

[0072] Example 8

[0073] The difference between Example 8 and Example 1 is that:

[0074] like Figure 14 As shown, the cross-sectional shape of the grooves processed in the bearing box side shell 31, the intermediate shell 32 and the casing side shell 33 to match the carbon ring inflatable sealing ring assembly 4 is a pointed roof house shape, and the cross-sectional shape of the inflation cavity is consistent with the cross-sectional shape of the groove, and is also a pointed roof house shape.

[0075] Example 9

[0076] The difference between Example 9 and Example 1 is that:

[0077] like Figure 15As shown, the cross-sectional shape of the grooves processed in the bearing box side shell 31, the intermediate shell 32 and the casing side shell 33 to match the carbon ring inflatable sealing ring assembly 4 is convex, and the cross-sectional shape of the inflation cavity is consistent with the cross-sectional shape of the groove, which is also convex.

Claims

1. A carbon ring seal with an online adjustable gap, characterized in that: It includes a housing assembly, several carbon ring inflatable sealing ring assemblies, a shaft sleeve, a locking nut, several intake and exhaust components and an inflation and deflation system; The housing assembly includes a bearing box side housing, several intermediate housings and a casing side housing, the housing assembly is fixedly installed in the compressor housing, the shaft sleeve passes through the inner hole of the housing assembly and is sleeved on the outer circle of the compressor main shaft and is locked by a locking nut to ensure that it does not move, the bearing box side housing, several intermediate housings and casing side housing are processed with grooves and air nozzle holes that match the carbon ring-embedded air sealing ring assembly; the carbon ring-embedded air sealing ring assembly includes an air nozzle, a sealing ring and several carbon ring assemblies, the sealing ring is provided with an air charging cavity, the air charging and discharging holes of the air charging cavity are connected to the air nozzle, and a carbon ring assembly is installed at the inner hole of the sealing ring, the carbon ring-embedded air sealing ring assembly is installed in the grooves in the bearing box side housing, several intermediate housings and casing side housing, the air nozzle passes through the air nozzle hole and the end is connected to the air intake and exhaust assembly, and several air intake and exhaust assemblies are connected to the air charging and discharging system; The inner hole of the sealing ring is provided with several rows of grooves, and several rubber partitions are evenly distributed in each row of grooves. Each row of rubber partitions are staggered or not staggered. The rubber partitions divide each groove into several groove units. Bosses are provided at both ends of the inner hole side of the groove. Each group of carbon ring assemblies is composed of several carbon rings. The inner hole side of the carbon ring is processed with a card groove that matches the boss of the inner hole of the sealing ring. A carbon ring is installed in each groove unit. The carbon ring is wrapped in the groove of the sealing ring, and the carbon ring can be ensured not to fall off under the obstruction of the boss.

2. The carbon ring seal with online adjustable gap according to claim 1, characterized in that: The bearing box side shell is processed with an oil guide groove close to the bearing box side.

3. The carbon ring seal with online adjustable gap according to claim 1, characterized in that: The inner holes of the bearing box side housing, the plurality of intermediate housings and the casing side housing and the matching sections with the outer circle of the shaft sleeve are processed with comb teeth seals.

4. The carbon ring seal with online adjustable gap according to claim 1, characterized in that: The bearing box side shell is processed with a light hole near the bearing box side; the outer circle of the locking nut is processed with a spiral groove, and the spiral groove cooperates with the front end light hole section of the bearing box side shell to form a spiral seal.

5. The carbon ring seal with online adjustable gap according to claim 1, characterized in that: The front end of the groove of the bearing box side shell matching the sealing ring is processed with a balancing air hole, and comb seals are processed on both sides of the balancing air hole, and the balancing air hole is connected to the atmosphere.

6. The carbon ring seal with online adjustable gap according to claim 1, characterized in that: The cross-sectional shape of the grooves processed in the bearing box side shell, the intermediate shell and the casing side shell to match the carbon ring inflatable sealing ring assembly is one or a combination of arc, square, inverted trapezoid, regular trapezoid, octagon, flat-roofed house shape, triangle, pointed-roofed house shape or convex shape.

7. The carbon ring seal with online adjustable gap according to claim 1, characterized in that: The cross section of the air-filled cavity is one or a combination of the following shapes: arc, square, inverted trapezoid, regular trapezoid, octagon, flat-roofed house shape, triangle, pointed-roofed house shape or convex shape.

8. The carbon ring seal with online adjustable gap according to claim 1, characterized in that: The inflation and deflation system consists of an air source, a pressure reducing valve, two valve groups, inlet and exhaust pipelines and a pressure gauge. The isolation valve in the two valve groups is connected to the pressure gauge, and the discharge valve in the two valve groups is connected to the atmosphere, wherein the isolation valve is normally open and the discharge valve is normally closed; the air source, pressure reducing valve, two valve groups and each group of inlet and exhaust components are connected by inlet and exhaust pipelines.

Images