CN219317216U - Air seal device for oil blocking seal of balance disc of centrifugal compressor - Google Patents
Air seal device for oil blocking seal of balance disc of centrifugal compressor Download PDFInfo
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- CN219317216U CN219317216U CN202320188562.8U CN202320188562U CN219317216U CN 219317216 U CN219317216 U CN 219317216U CN 202320188562 U CN202320188562 U CN 202320188562U CN 219317216 U CN219317216 U CN 219317216U
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Abstract
The utility model discloses an air sealing device for oil blocking and sealing of a balance disc of a centrifugal compressor, and relates to the field of centrifugal compressors. The gas seal device comprises: the utility model relates to a centrifugal compressor, which comprises a gas transmission pipeline, a pneumatic regulating valve, a flowmeter, a filter, a self-standing pressure reducing valve, a pressure gauge, a flow guide pipe and a nozzle, wherein the pneumatic regulating valve, the flowmeter, the filter, the self-standing pressure reducing valve and the pressure gauge are sequentially connected in series, the inlet of the gas transmission pipeline is connected with a gas source outlet, the pneumatic regulating valve, the filter, the self-standing pressure reducing valve and the pressure gauge are sequentially arranged on the gas transmission pipeline according to the gas inlet direction, the outlet of the gas transmission pipeline is connected with the flow guide pipe, the flow guide pipe is connected with the nozzle, an automatic control module of a gas sealing device is additionally arranged, the pneumatic regulating valve automatically regulates the gas flow according to a flow set value, and the self-standing pressure reducing valve automatically regulates the gas pressure according to a pressure set value.
Description
Technical Field
The utility model belongs to the technical field of deep cooling air separation, and particularly relates to a centrifugal compressor in the technical field.
Background
The centrifugal compressor consists of two parts of a rotor and a stator. The rotor comprises a rotating shaft, an impeller, a shaft sleeve, a balance disc, a thrust disc, a shaft coupling and other parts which are fixed on the shaft; the stator comprises a cylinder, various partition boards positioned on the cylinder, a bearing and other parts; sealing elements are also provided between the rotor and stator where sealing gas is required.
The centrifugal compressor in the field of air separation has the functions of compressing and conveying air and various industrial gases, and simultaneously improving the pressure of the gases. In a multistage centrifugal compressor, the rotor is subjected to a resultant force directed toward the low pressure end, referred to as axial force, due to the unequal magnitudes of the gas forces on both sides of each stage of impeller. The axial force is detrimental to the normal operation of the compressor, and is liable to cause damage to the thrust bearing, causing the rotor to move towards one end, and in the event of severe cases, the rotor may collide with the fixing member, causing an accident, due to the fact that the correct relative position between the guide actuator offset and the fixing element is lost. The balance disc is a part for balancing axial force by utilizing the pressure difference of the gas at two sides of the balance disc, one side of the balance disc is the pressure in the side gap of the final impeller disc, the other side of the balance disc is communicated with the atmosphere or an air inlet pipe, normally, the balance disc only balances part of the axial force, the rest of the axial force is born by a thrust bearing, and an air seal is arranged at the outer edge of the balance disc and used for preventing gas from leaking out and keeping the differential pressure at two sides.
In the prior art, the lubricating oil of the balance disc of the centrifugal compressor adopts a splash lubrication method, and therefore, an oil baffle seal of the balance disc which rotates synchronously with the main shaft is arranged, and the splash lubricating oil is thrown back to the oil return hole through centrifugal force generated by synchronous rotation of the main shaft, and enters an oil return pipeline to flow into an oil tank for recycling.
The following problems exist in the actual operation of the centrifugal compressor:
1. the centrifugal compressor is started frequently, has long running time, is easy to cause abrasion of an oil blocking sealing ring, has low oil throwing amount of lubricating oil, has high liquid level of the lubricating oil in an oil blocking seal, and has the phenomenon of lubricating oil seepage and oil leakage of the oil blocking seal.
2. The centrifugal compressor has poor lubricating oil filter effect and oil mist separator failure, and when the oil return hole of the oil blocking seal ring is blocked and the oil tank generates positive pressure, the lubricating oil return quantity is low, the accumulated quantity of the lubricating oil in the oil blocking seal is large, and the phenomenon of oil leakage and oil overflow of the lubricating oil of the oil blocking seal occurs.
3. The oil-blocking sealing oil leakage of the balance disc of the centrifugal compressor has two phenomena of external leakage and internal leakage. The oil blocking seal leakage is that lubricating oil leaks into a centrifugal compressor body through an oil blocking seal ring of a balance disc, so that the normal operation of the machine is affected, and the centrifugal compressor must be stopped and overhauled at a selected period; the oil-retaining seal inner leakage is that lubricating oil leaks into the air side flow passage of the centrifugal compressor through the oil-retaining seal ring of the balance disc and is mixed with compressed medium gas, especially the compressed medium gas is combustion-supporting and inflammable gas such as oxygen, hydrogen and the like, so that the operation potential safety hazard of the centrifugal compressor is caused. When the oil leakage of the oil baffle seal of the balance disc of the centrifugal compressor is large and the external leakage and the internal leakage occur simultaneously, the balance disc of the centrifugal compressor must be stopped and overhauled in time.
When the oil blocking seal ring of the balance disc is worn, the oil return hole is blocked, and the oil tank is positive pressure to cause oil blocking seal leakage, the oil blocking seal of the balance disc can be stopped and replaced, and faults of the lubricating oil filter and the oil mist separator are treated, so that the normal production and operation cost of the air separation system are greatly influenced.
For example, for the RIK100-4 centrifugal air compressor matched with the air separation device of the horse steel 35000m3/h, the starting times of the air separation device are more than 120 times since production is carried out abroad, the wear of the oil baffle sealing ring of the balancing disc is large, and the time and the price for ordering the oil baffle sealing spare parts of the balancing disc of the RIK100-4 centrifugal air compressor from abroad are long, the air separation device cannot be in place in time, and the air separation device of the horse steel 35000m3/h is required to keep running due to production maintenance. The oil-retaining seal has serious internal leakage phenomenon, and the large flow passage of lubricating oil entering the air side of the centrifugal compressor causes that the content of the lubricating oil carried by air discharged from the outlet end of the balancing disk to the atmosphere is out of standard in a small amount at the outlet of the 4-stage impeller of the centrifugal compressor; meanwhile, the outlet air of the RIK100-4 centrifugal air compressor runs with oil, and a small amount of lubricating oil enters an air cooling tower; lubricating oil leakage not only pollutes the atmosphere, but also brings potential safety hazards to equipment.
Disclosure of Invention
(one) solving the technical problems
Aiming at the problems existing in the background technology, the utility model provides an air seal device of a balance disc oil baffle seal of a centrifugal compressor, which solves the problems of abrasion of an oil baffle seal ring of the balance disc, blockage of an oil return hole and oil tank positive pressure phenomenon during the working period of the centrifugal compressor under the condition that the oil baffle seal of the balance disc cannot be replaced in time and is not stopped, and maintains the safe, stable and economic operation of the centrifugal compressor.
(II) technical scheme
In order to achieve the above purpose, the utility model is realized by the following technical scheme: an air seal device for oil-blocking seal of balance disc of centrifugal compressor is disclosed.
The utility model relates to an air seal device for oil blocking seal of a balance disc of a centrifugal compressor, which mainly comprises a rotor and a stator, wherein the rotor comprises parts such as an impeller, a main shaft, the balance disc, a shaft seal, the oil blocking seal and the like, the main body of the stator is a cylinder, and the air seal device also comprises a diffuser, a bend, a reflux device, a burst pipe, an exhaust pipe and the like, and is characterized in that the periphery of the oil blocking seal is provided with the air seal device, and the air seal device comprises: the device comprises a gas transmission pipeline, a pneumatic regulating valve, a flowmeter, a filter, a self-standing pressure reducing valve, a pressure gauge, a flow guide pipe and a nozzle, wherein the pneumatic regulating valve, the flowmeter, the filter, the self-standing pressure reducing valve and the pressure gauge are sequentially connected in series, the inlet of the gas transmission pipeline is connected with a gas source outlet, the pneumatic regulating valve, the flowmeter, the filter, the self-standing pressure reducing valve and the pressure gauge are sequentially arranged on the gas transmission pipeline according to the gas inlet direction, the outlet of the gas transmission pipeline is connected with the flow guide pipe, and the flow guide pipe is connected with the nozzle.
The working principle of the utility model is that a gas source with the pressure larger than that of lubricating oil of the centrifugal compressor is selected, and the pressure difference between the gas and the lubricating oil is utilized to seal the lubricating oil leaked by the oil baffle seal of the balance disc; the gas source gas of the gas seal device can be provided by air at the outlet of a molecular sieve absorber or industrial gases of various pipe networks, the physical properties of the gas source gas used must be stable, and the gas source gas is dry and clean, cannot pollute lubricating oil and compressed medium gas, and cannot generate chemical reaction with the lubricating oil and the compressed medium gas.
The set value of the air source pressure of the air seal device is larger than the oil pressure of the outlet of the oil pump of the centrifugal compressor and smaller than the final exhaust pressure of the centrifugal compressor, so that the oil seal leakage lubricating oil of the balance disc can be effectively plugged, and the air of the air seal device is prevented from flowing into the final air flow passage of the centrifugal compressor.
The first technical scheme of the utility model is as follows: the nozzle of the air sealing device is designed into a ring shape, and a plurality of small hole-shaped nozzles are uniformly arranged on the ring at intervals; the nozzle is designed into a circular ring shape, so that gas seal gas can be uniformly sprayed into the seal sparse teeth of the outlet of the oil retaining seal ring of the balance disc through the nozzle.
The second technical scheme of the utility model is as follows: the flowmeter of the gas sealing device is set to be an even-speed flowmeter, the accuracy of the even-speed flowmeter is high, and meanwhile, the flow rate of gas sealing gas in a gas pipeline can be controlled.
The third technical scheme of the utility model is as follows: the air seal device is integrally arranged outside the centrifugal compressor frame, the nozzle is arranged on the outer side of the sealing and thinning tooth of the oil blocking sealing ring outlet of the balance disc, the nozzle is fixed through a clamping ring, the clamping ring and the nozzle are in a circular ring shape, the clamping ring and the nozzle are concentrically and integrally arranged, and the clamping ring fixes the nozzle on the inner wall of the stator casing on the outer side of the sealing and thinning tooth of the oil blocking sealing ring outlet.
The materials of the gas transmission pipeline, the filter, the self-supporting pressure reducing valve, the pressure gauge, the flow guide pipe, the nozzle and the clamping ring of the gas sealing device are selected according to the physical properties of gas source gas, so that the gas sealing device is not corroded.
In order to completely realize the automatic operation of the gas seal device for the oil blocking seal of the balance disc of the centrifugal compressor, an automatic control module of the gas seal device is additionally arranged in a DCS or PLC control system of the centrifugal compressor, the pneumatic regulating valve, the flowmeter, the self-standing pressure reducing valve and the pressure gauge are connected into the automatic control module, the pneumatic regulating valve automatically regulates the gas flow according to a flow set value, and the self-standing pressure reducing valve automatically regulates the gas pressure according to a pressure set value.
The technical scheme of the utility model can be applied to various centrifugal compressors in different industries, including the application of the technical principle of the technical scheme of the utility model, and the addition, reduction or change of the structures of parts such as valves, meters and types, or nozzles, or the change of the arrangement of gas pipelines, etc. are all within the scope of the technical scheme of the utility model.
(III) beneficial effects
The utility model provides an air sealing device for oil blocking and sealing of a balance disc of a centrifugal compressor, which comprises the following components
The beneficial effects are that:
(1) The air sealing device for the oil blocking seal of the balancing disc of the centrifugal compressor solves the problem that oil leakage occurs in the oil blocking seal of the balancing disc of the centrifugal compressor when the oil blocking seal ring of the balancing disc of the centrifugal compressor is worn or an oil return hole is blocked and an oil tank is in positive pressure, maintains the stable operation of the centrifugal compressor until shutdown maintenance or replacement of spare parts, plays a positive role in stable continuous production, and reduces production instability and economic loss caused by shutdown failure and temporary shutdown of the oil blocking seal of the balancing disc.
(2) The gas seal device for the oil baffle seal of the balance disc of the centrifugal compressor adopts a DCS or PLC technology as a control technology of a system, and an air inlet valve of the gas seal device is set to be a pneumatic regulating valve, so that the gas seal device completely achieves the purpose of automatic operation, and can be applied to various centrifugal compressors in different industries.
Drawings
FIG. 1 is a schematic diagram of an air seal device for an oil baffle seal of a balance disc of a centrifugal compressor;
FIG. 2 is a schematic view of the planar structure of a nozzle of the gas seal device of the present utility model;
FIG. 3 is a schematic side elevation view of a nozzle of the air seal device of the present utility model.
Symbol description: c01, a centrifugal air compressor; c02, an air pre-cooling system; c03, molecular sieve adsorber; c04, a cold box; d01, balance disc; d02, oil blocking and sealing; v11, a pneumatic regulating valve; f01, a flowmeter; d04, a filter; v12, a self-standing pressure reducing valve; f02, a pressure gauge; d03, a honeycomb duct; d05, a nozzle; d06, snap ring; and D07, spraying nozzle.
Detailed Description
Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings, where the embodiments described below are only some embodiments, but not all embodiments of the technical solutions of the present utility model.
Now with the horseshoe 35000m 3 For example, the RIK100-4 centrifugal air compressor C01 matched with the air separation device is taken as an example, and an air sealing device air source of the oil blocking seal D02 of the centrifugal air compressor C01 balance disc D01 in the air separation device is selected from dry and clean air at an outlet of the molecular sieve absorber C03, and the air inlet pressure of the air sealing device is set to be 0.45MPa.
The designed air sealing device comprises a pneumatic regulating valve V11, a flowmeter F01, a filter D04, a self-supporting pressure reducing valve V12, a pressure gauge F02, a flow guiding pipe D03, a nozzle D05, a clamping ring D06 and a gas transmission pipeline which are sequentially connected in series according to the air inlet direction, wherein all parts and pipelines are made of 304-type stainless steel materials. Through calculation, the diameter of a gas pipeline of the gas seal device is 20mm, and the flow design value is 25m 3 And/h, the technical requirement of gas flow of a gas sealing device matched with the oil-blocking seal D02 of the balance disc D01 of the centrifugal air compressor is met.
According to the design and operation technical requirements, the diameter of a gas transmission pipeline of the gas sealing device is 20-50 mm, the mesh number of a filter D04 is 100-120 meshes, the set value of a self-standing pressure reducing valve V12 is 0.35-0.4 MPa, the pipe diameter of a guide pipe D03 is 10-15 mm, the number of nozzles D05 and D07 is 6-12, the number of locating pins of a clamping ring D06 is 3-6, and the specific technical parameters are implemented after further optimization.
The inlet pipeline of the pneumatic regulating valve V11 is connected with the outlet air pipeline of the molecular sieve absorber C03, meanwhile, 1 flowmeter F01 is installed in the outlet pipeline of the pneumatic regulating valve V11, and the air seal device flowmeter F01 is arranged as an albaw flowmeter in the uniform speed flowmeter, so that the resistance is low and the precision is high. 1 gas filter D04 is arranged in a gas pipeline of an outlet section of the flowmeter F01, solid particles in air in the gas seal air are prevented from entering the oil baffle seal D02, the filter D04 is designed to be horizontal and 100 meshes, and a filter cartridge in the filter D04 can be detached and cleaned for reuse.
1 self-standing pressure reducing valve V12 and pressure gauge F02 are respectively and sequentially arranged in the gas transmission pipeline at the outlet section of the filter D04, the set value of the self-standing pressure reducing valve V12 is 0.35MPa, and the air pressure of the gas seal device at the outlet end of the self-standing pressure reducing valve V12 is automatically regulated to 0.35MPa.
Through actual calculation and field test correction for a plurality of times, the diameter of a guide pipe D03 at the tail end of a gas transmission pipeline is designed to be 12mm, the diameter of an annular nozzle D05 of a gas seal device is 15mm, the number of nozzles is designed to be 6, and the balance disc D01 oil-blocking seal D02 achieves the expected effect and has no oil leakage phenomenon.
The air seal device clamping ring D06 and the nozzle D05 are both annular, the clamping ring D06 and the nozzle D05 are concentrically and integrally arranged, 3 positioning pins are arranged on the clamping ring D06, and the clamping ring D06 and the nozzle D05 are fixed on the inner wall of the stator casing outside the oil seal dredging teeth of the oil seal D02 outlet of the balance disc D01.
At 35000m 3 The DCS control system of the/h air separation device is additionally provided with an air seal device control logic module, an automatic air seal device control switch is arranged, a pneumatic regulating valve V11 automatically opens and regulates the air flow of the oil baffle seal D02 air seal device according to a set value of a flowmeter F01, and a self-standing pressure reducing valve V12 automatically regulates the air pressure of the air seal device at the outlet end of the self-standing pressure reducing valve V12 to 0.35MPa according to the set value.
The automatic operation method of the air sealing device of the oil blocking seal D02 of the balance disc D01 of the centrifugal air compressor C01 of the horse steel RIK100-4 is as follows:
first, start the separationA core type air compressor C01, a put-into-operation air precooling system C02 and a molecular sieve absorber C03, wherein the set value of a flowmeter F01 is set to be 15m 3 And/h, the set value of the self-standing pressure reducing valve V12 is 0.35MPa.
When the air dew point of the outlet of the molecular sieve absorber is less than 65 ℃ and the carbon dioxide content is less than 1PPm, an automatic control switch of an air sealing device in a DCS control system of the air separation device is put into operation, a pneumatic control valve V11 is automatically opened and adjusted, and dry and clean air of the outlet of the molecular sieve absorber C03 is guided into a seal sparse tooth of an outlet seal hole of a D01 oil-retaining seal D02 of a centrifugal air compressor C01 balance disc through a gas transmission pipeline of the air sealing device, and the outlet seal hole of the balance disc D01 oil-retaining seal D02 is plugged.
Then, according to the change of the vibration value of the C01 shaft of the centrifugal air compressor and the condition of lubricating oil entrainment of air discharged from the outlet end of the balance disc D01, the set value of the flowmeter F01 is raised to 25m 3 And/h. Thus, the oil leakage phenomenon of the oil baffle seal D02 of the balance disc D01 of the centrifugal air compressor C01 is kept.
In summary, the air sealing device for the oil blocking seal of the balance disc of the centrifugal compressor completely solves the oil leakage phenomenon of the oil blocking seal of the balance disc when the centrifugal compressor cannot be stopped for maintenance or parts are replaced to continuously run under the production maintaining state, and has good practical effect in field practice.
It should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and for example, the connection may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two structures. It will be apparent to those skilled in the art that the specific meaning of the terms described above in this application may be understood in the light of the general inventive concept in connection with the present application.
Claims (5)
1. The utility model provides a centrifugal compressor balance plate keeps off sealed atmoseal device of oil, centrifugal compressor mainly comprises rotor and stator two parts, the rotor includes spare parts such as impeller, main shaft, balance plate, bearing seal, keeps off oil seal, and the main part of stator is the cylinder, still includes devices such as diffuser, bend, backward flow ware, burst trachea, blast pipe, its characterized in that set up atmoseal device around keeping off oil seal, atmoseal device includes: the device comprises a gas transmission pipeline, a pneumatic regulating valve, a flowmeter, a filter, a self-standing pressure reducing valve, a pressure gauge, a flow guide pipe and a nozzle, wherein the pneumatic regulating valve, the flowmeter, the filter, the self-standing pressure reducing valve and the pressure gauge are sequentially connected in series, the inlet of the gas transmission pipeline is connected with a gas source outlet, the pneumatic regulating valve, the flowmeter, the filter, the self-standing pressure reducing valve and the pressure gauge are sequentially arranged on the gas transmission pipeline according to the gas inlet direction, the outlet of the gas transmission pipeline is connected with the flow guide pipe, and the flow guide pipe is connected with the nozzle.
2. The gas seal device for oil baffle seal of balance disc of centrifugal compressor according to claim 1, characterized in that: the nozzle of the air sealing device is designed into a ring shape, and a plurality of small hole-shaped nozzles are uniformly arranged on the ring at intervals.
3. The gas seal device for oil baffle seal of balance disc of centrifugal compressor according to claim 1, characterized in that: the air seal device flowmeter is set to be an average speed flowmeter.
4. The gas seal device for oil baffle seal of balance disc of centrifugal compressor according to claim 1, characterized in that: the air seal device is integrally arranged outside the centrifugal compressor frame, the nozzle is arranged on the outer side of the sealing and thinning tooth of the oil blocking sealing ring outlet of the balance disc, the nozzle is fixed through a clamping ring, the clamping ring and the nozzle are in a circular ring shape, the clamping ring and the nozzle are concentrically and integrally arranged, and the clamping ring fixes the nozzle on the inner wall of the stator casing on the outer side of the sealing and thinning tooth of the oil blocking sealing ring outlet.
5. The air seal device for oil seal of balance disc of centrifugal compressor according to claim 1, 2, 3 or 4, wherein: an automatic control module of the air sealing device is additionally arranged in a DCS or PLC control system of the centrifugal compressor, the pneumatic regulating valve, the flowmeter, the self-standing pressure reducing valve and the pressure gauge are connected into the automatic control module, the pneumatic regulating valve automatically regulates the gas flow according to the flow set value, and the self-standing pressure reducing valve automatically regulates the gas pressure according to the pressure set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320188562.8U CN219317216U (en) | 2023-02-13 | 2023-02-13 | Air seal device for oil blocking seal of balance disc of centrifugal compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320188562.8U CN219317216U (en) | 2023-02-13 | 2023-02-13 | Air seal device for oil blocking seal of balance disc of centrifugal compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219317216U true CN219317216U (en) | 2023-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320188562.8U Active CN219317216U (en) | 2023-02-13 | 2023-02-13 | Air seal device for oil blocking seal of balance disc of centrifugal compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219317216U (en) |
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2023
- 2023-02-13 CN CN202320188562.8U patent/CN219317216U/en active Active
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