CN217206882U - Series connection sealing structure of compressor and sealing system thereof - Google Patents
Series connection sealing structure of compressor and sealing system thereof Download PDFInfo
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- CN217206882U CN217206882U CN202220511544.4U CN202220511544U CN217206882U CN 217206882 U CN217206882 U CN 217206882U CN 202220511544 U CN202220511544 U CN 202220511544U CN 217206882 U CN217206882 U CN 217206882U
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Abstract
The utility model discloses a series connection seal structure of compressor and sealing system thereof. The structure comprises an inner rotary body and an outer shell, wherein a sealing group I, a sealing group II, a sealing group III and a sealing group IV are arranged between the inner rotary body and the outer shell, and a seal is formed between the sealing group I and the sealing group IIThe hydroecium forms the return water between seal group II and the seal group III and collects the room, forms sealed air chamber between seal group III and the seal group IV, is equipped with sealed mouth of a river, sealed gas port and return water mouth on the shell body, and sealed water passes through sealed mouth of a river and sealed hydroecium intercommunication, and sealed gas passes through sealed gas port and sealed air chamber intercommunication. The sealing system comprises a water supply subsystem and an air supply subsystem, wherein the water supply subsystem is communicated with a sealing water port, and the air supply subsystem is communicated with a sealing air port. The utility model has the advantages that: the series sealing arrangement is adopted, wherein the primary sealing is used as the main sealing and the secondary sealing is used as the auxiliary sealing under the normal condition; in extreme cases, after the water flow of the first-stage sealing is cut off, the second-stage N can be relied on 2 The sealing system forms a reliable seal.
Description
Technical Field
The utility model belongs to the technical field of the chemical industry, specifically be a can be applied to screw rod vacuum compressor's in natural gas system acetylene series connection seal structure and sealing system thereof.
Background
A screw vacuum compressor in the process of preparing acetylene from natural gas generally adopts carbon ring sealing, and a sealing medium is generally gas. The sealing gas of the gas seal uses nitrogen or low-pressure steam, and has the following problems: excessive nitrogen enters the process system to influence the components of the process gas, the process is not allowed, and the use of steam is easy to cause locking accidents of a shaft and a carbon ring and dilute the concentration of a solvent in the system.
The sealed seal structure of traditional carbocycle generally disposes fluidtight in the inboard, and the gas is kept apart in the configuration in the outside, and middle upper portion has a drain, and the lower part has the leakage fluid dram. However, for screw vacuum compressors with very high vacuum levels (-15 kPaA), the vent is not suitable due to unstable pressure in the middle of the seal chamber. The leakage amount of the carbon ring seal under the negative pressure working condition is far larger than that under the positive pressure working condition under the same differential pressure, and in the seal body structure and the system designed by the conventional method, the possibility that sealing liquid leaks to pollute a bearing chamber and lubricating oil exists, the insufficient supply of the sealing liquid is more likely to occur, and the air is leaked into a compressor cavity and enters the system to form the danger of explosive gas. Because acetylene gas is an extremely flammable gas and has an explosion limit of 2.3-72.3% (vol) in air, air is prohibited from leaking into a compressor chamber, which puts extremely high requirements on the shaft seal of the acetylene gas vacuum compressor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the serial sealing structure and the sealing system thereof solve the problems of leakage and unsafety of the existing sealing structure, the water sealing is the main sealing, the air sealing is the auxiliary or standby sealing, the double insurance can carry out bidirectional reliable sealing on the screw rod vacuum compressor, and the leakage of 0 is realized in two directions.
The purpose of the utility model is realized through the following technical scheme:
the utility model provides a series connection seal structure of compressor, including adversion body and shell body, be equipped with the seal group I who arranges in proper order by compressor side bearing side between adversion body and the shell body, seal group II, seal group III and seal group IV, form sealed hydroecium between seal group I and the seal group II, form the return water between seal group II and the seal group III and collect the room, form sealed air chamber between seal group III and the seal group IV, be equipped with the sealed mouth of a river on the shell body, sealed gas mouth and return water mouth, sealed water passes through sealed mouth of a river and sealed hydroecium intercommunication, sealed gas passes through sealed mouth and sealed air chamber intercommunication, return water mouth and return water collection room intercommunication.
Furthermore, the sealing water is solvent water containing NMP, and the sealing gas is nitrogen.
Furthermore, the outer shell is provided with an inspection opening which is communicated with the sealed air chamber.
Furthermore, the sealing group I, the sealing group II and the sealing group IV are carbon ring groups, and the sealing group III is labyrinth seal.
Furthermore, the sealing group I is positioned between the compression cavity and the sealing water chamber, and the sealing group IV is positioned between the sealing air chamber and the bearing cavity.
The sealing system with the sealing structure comprises a water supply subsystem and a gas supply subsystem, wherein the water supply subsystem is communicated with the sealing water gap, and the gas supply subsystem is communicated with the sealing gas gap.
Furthermore, the water supply subsystem include the water pitcher, water pitcher and force (forcing) pump intercommunication, force (forcing) pump and cooling module intercommunication, cooling module and water filtering component intercommunication, water filtering component and measurement subassembly intercommunication, measurement subassembly and water pressure regulating component intercommunication, water pressure regulating component and sealed mouth of a river intercommunication, return water mouth and water pitcher intercommunication.
Furthermore, the water tank is a micro-positive pressure water tank, the water tank is respectively communicated with the micro-positive pressure air supply assembly and the emptying assembly, a sight glass is arranged on a water return pipe between the water return port and the water tank, and the water return pipe extends into the water tank and is inserted below the liquid level.
Furthermore, the air supply subsystem comprises an air supply end, the air supply end is communicated with the air filtering assembly, the air filtering assembly is communicated with the air pressure regulating assembly, and the air pressure regulating assembly is communicated with the sealing air port.
The sealing body is two-stage series sealing:
the first-stage seal is a liquid seal, and solvent liquid (hereinafter referred to as seal water) from a micro-positive pressure water tank is pressurized, cooled, filtered, metered and pressure-regulated and then is delivered to sealing water gaps at two ends of a compressor. The sealing water at the air inlet end and the air outlet end of the compressor is respectively controlled by differential pressure, and reference pressure is respectively introduced from the pressure of the air inlet pipeline and the pressure of the air outlet pipeline, so that the sealing water pressure is higher than the pressure in the compression cavity under any working condition and positive pressure is maintained. Sealing water is introduced into the middle of the sealing body, leaks to two sides through the carbon ring respectively, and leaks into the compression cavity from the inner side to form continuous blocking fluid to form reliable sealing for the compression cavity; and after throttling and pressure reduction of outside leakage water through a carbon ring, the outside leakage water is communicated with a water return main pipe through a water return port, the water is returned by normal pressure gravity (a half pipe) to a water receiving tank (nitrogen is introduced, and the micro-positive pressure of 5kPa is maintained), and the sealing water is recycled. When the water-returning pipe-type sealing water backflow device works normally, backflow amount of sealing water is observed through the flowing view mirror of the water-returning pipe, trace sealing water backflow is suitable, and excessive backflow water causes energy waste and outward fleeing risks. The backwater main pipe is large in diameter and strong in water delivery capacity, and the communicated micro-positive pressure water tank plays a role in stabilizing the middle pressure of the sealing body.
The secondary seal is gas seal, low-pressure seal nitrogen is filtered and pressure-regulated and then is distributed to the rear parts of the air inlet end and the air outlet end of the compressor, N 2 Inward leakage blocks the first-stage sealing backwater from flowing to the bearing cavity, leakage gas and first-stage sealing backwater (if present) share backwater (gas) pipelines to discharge a sealing body; n is a radical of 2 And the lubricating oil leaks into the bearing cavity outwards, and the air and the lubricating oil are blocked from channeling to the sealing body and the compression cavity. The pressure of the sealing gas is about 20kPa and is slightly higher than the pressure of a discharge end return water pipe of the compressor (the back pressure is 5kPa of the pressure of the normal pressure solvent tank). When the liquid seal works normally, the liquid seal is used as a main seal, and the gas seal is only used as isolation gas; when the liquid seal is insufficient in dense sealing liquid supply due to fluctuation of working conditions (starting and stopping working conditions and other abnormal working conditions) and the like, or when the sealing liquid demand is increased due to reduction of the sealing effect caused by carbon ring abrasion and the like, the outside sealing gas can be increased in supply at any time and serves as secondary sealing (auxiliary sealing) to form the effect of common sealing of liquid and gas, the compressor is reliably sealed, and the shaft end of the vacuum compressor is prevented from sucking external air or oil gas in a bearing cavity. The gas seal system design capability meets the extreme conditions (such as start-up conditions) requirements for liquid seal shut-off. The series sealing method can greatly improve the reliability of the sealing system because the low-pressure nitrogen used by the secondary seal is reliably supplied in a chemical plant.
Aiming at the working conditions of vacuum working conditions of a sealed cavity, low injection pressure of a sealing medium and air suction risk, a PDV valve rear sealing water pipeline system/PDCV valve rear sealing air pipeline system, a shell, a sealing body liquid inlet/air inlet through hole and a water inlet chamber/air inlet chamber are configured, so that the supply of sealing water and sealing air has the characteristics of large flow elasticity and small pressure fluctuation, the stability and the reliability are high, and the bidirectional 0 leakage is realized.
The utility model has the advantages that:
1. the series sealing arrangement is different from the idea and structure of the conventional single-stage sealing of carbon ring sealing, and the sealing medium adopts circulating sealing liquid (primary) and low-pressure N 2 (second stage). Under normal conditions, the primary seal is main, and the secondary seal is auxiliary or only has standby/isolation function; under extreme conditions (such as start-stop working conditions), after the primary sealing water is cut off, secondary N can be relied on 2 The sealing system forms a reliable seal.
2. The large-diameter backwater (gas) main pipe is inserted below the liquid level of the solvent liquid tank (the solvent liquid tank adopts N) 2 Purge, maintain slight positive pressure) to form a larger buffer volume. The secondary seal reference pressure is led from a return water/gas branch pipe at the exhaust end of the compressor, and the stability of the pressure in the middle of the seal cavity is maintained.
3. Aiming at the working conditions of vacuum working conditions of a sealed cavity, low injection pressure of a sealing medium and air suction risk, a PDV valve rear sealing water pipeline system/PDCV valve rear sealing air pipeline system, a shell, a sealing body liquid inlet/air inlet through hole and a liquid inlet chamber/air inlet chamber are configured, so that the supply of sealing water and sealing air has the characteristics of large flow elasticity and small pressure fluctuation, the stability and the reliability are very high, and the bidirectional '0' leakage is realized.
The main scheme and the further selection schemes of the utility model can be freely combined to form a plurality of schemes, which are the schemes that can be adopted and claimed by the utility model; in addition, the utility model can be freely combined between the (non-conflict selection) selections and other selections. After understanding the technical solutions of the present invention, those skilled in the art can understand that there are many combinations according to the prior art and the common general knowledge, which are the technical solutions to be protected by the present invention, and the embodiments are not exhaustive here.
Drawings
Fig. 1 is a schematic view of the sealing structure of the present invention.
Fig. 2 is a schematic view of the sealing system of the present invention.
In the figure: a-a sealed water gap, B-a sealed air port, P1-a water return port, P2-an inspection port, C-a sealed water chamber, D-a return water collection chamber, E-a sealed air chamber, 1-a sealing group I, 2-a sealing group II, 3-a sealing group III, 4-a sealing group IV, 11-an inner rotator and 12-an outer shell; 21-water tank, 22-pressure pump, 23-cooling component, 24-water filtering component, 25-metering component, 26-water pressure regulating component, 27-gas supply end, 28-gas filtering component and 29-gas pressure regulating component.
Detailed Description
The invention will be further described with reference to the following specific embodiments and the accompanying drawings.
Example 1
Referring to fig. 1, a tandem seal structure of a compressor includes an inner rotor 11, an outer casing 12, a seal group I1, a seal group II2, a seal group III3, and a seal group IV4, wherein the seal group I1, the seal group II2, the seal group III3, and the seal group IV4 are sealed and blocked between the inner rotor 11 and the outer casing 12.
Seal group I1, seal group II2 and seal group IV4 are carbon ring groups, and seal group III3 is a labyrinth seal. Four groups of sealing groups are sequentially arranged from the side bearing side of the compressor, a sealing water chamber C is formed between the sealing group I1 and the sealing group II2, a backwater collecting chamber D is formed between the sealing group II2 and the sealing group III3, a sealing air chamber E is formed between the sealing group III3 and the sealing group IV4, the sealing group I1 is located between the compression cavity and the sealing water chamber C, and the sealing group IV4 is located between the sealing air chamber E and the bearing cavity.
The outer shell 12 is provided with a sealing water gap A, a sealing air gap B, a water return port P1 and an inspection port P2, sealing water is communicated with a sealing water chamber C through the sealing water gap A, sealing air is communicated with a sealing air chamber E through the sealing air gap B, the water return port P1 is communicated with a return water collecting chamber D, and the inspection port P2 is communicated with the sealing air chamber E. The sealing water is solvent water containing NMP, and the sealing gas is nitrogen.
Example 2
Referring to fig. 2, the sealing system including the sealing structure further includes a water supply subsystem and a gas supply subsystem, the water supply subsystem is communicated with the sealing water gap a, and the gas supply subsystem is communicated with the sealing gas gap B.
The water supply subsystem comprises a water tank 21, a pressure pump 22, a cooling assembly 23, a water filtering assembly 24 and a metering assembly 25, the water tank 21 is communicated with the pressure pump 22, the pressure pump 22 is communicated with the cooling assembly 23, the cooling assembly 23 is communicated with the water filtering assembly 24, the water filtering assembly 24 is communicated with the metering assembly 25, the metering assembly 25 is communicated with a water pressure regulating assembly 26, the water pressure regulating assembly 26 is communicated with a sealing water gap A, and a water return port P1 is communicated with the water tank 21.
The water tank 21 is a micro-positive pressure water tank, the water tank 21 is respectively communicated with the micro-positive pressure air supply assembly and the emptying assembly, a sight glass is arranged on a water return pipe between the water return port P1 and the water tank 21, and the water return pipe extends into the water tank 21 and is inserted below the liquid level.
The air supply subsystem comprises an air supply end 27, an air filtering assembly 28 and an air pressure regulating assembly 29, wherein the air supply end 27 is communicated with the air filtering assembly 28, the air filtering assembly 28 is communicated with the air pressure regulating assembly 29, and the air pressure regulating assembly 29 is communicated with the sealing air port B.
The utility model discloses a work flow:
the sealed water gets into sealed body negative pressure seal hydroecium C through sealed mouth of a river A, and most get into compressor side seal group I in order to reach sealed effect, and a small amount of sealed water flows through seal group II to return water collection chamber D, sets up seal group III between return water collection chamber D and the sealed air chamber E. Sealing nitrogen enters a sealing air chamber E of the sealing body through a sealing air port B, a sealing group IV is arranged on the outer side of the sealing air chamber E, and a part of the sealing air enters a backwater collecting chamber D through a sealing group III to block the outward flowing of sealing water; when the sealing water is insufficient, the sealing gas further enters the sealing group II and the sealing group I to play a role in auxiliary sealing; the other part of the seal gas enters the seal group IV to block air and oil gas. The sealed return water or the mixture of the water and the nitrogen is discharged through a return water port P1. P2 is used as an inspection port and is normally closed.
The sealing water of the micro positive pressure water tank is pressurized, cooled, filtered, metered and pressure-regulated, and then is delivered to a sealing water port A at two ends of a compressor. The air inlet end and the air outlet end of the compressor are respectively controlled by differential pressure (2 is set for alarming and interlocking stop) and reference pressure is respectively led from the pressure of an air inlet pipeline and the pressure of an air outlet pipeline.
And after filtering and pressure regulating low-pressure sealing nitrogen for secondary sealing, distributing the nitrogen to the rear parts of sealing bodies at the air inlet end and the air outlet end of the compressor, and leading the nitrogen to a self-sealing water return pipeline by reference pressure.
The aforesaid the utility model discloses basic embodiment and each further alternative can the independent assortment in order to form a plurality of embodiments, is the utility model discloses can adopt and claim the embodiment of protection. In the scheme of the utility model, each selection example can be combined with any other basic examples and selection examples at will.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A tandem seal structure of a compressor, comprising an inner rotor (11) and an outer shell (12), characterized in that: inner rotor (11) and shell body (12) between be equipped with by the sealed group I (1) that the compressor side direction bearing side arranged in proper order, sealed group II (2), sealed group III (3) and sealed group IV (4), form sealed hydroecium (C) between sealed group I (1) and the sealed group II (2), form return water between sealed group II (2) and the sealed group III (3) and collect room (D), form sealed air chamber (E) between sealed group III (3) and the sealed group IV (4), be equipped with sealed mouth of a river (A) on shell body (12), sealed mouth of a river (B) and return water mouth (P1), sealed water is through sealed mouth of a river (A) and sealed hydroecium (C) intercommunication, sealed gas is through sealed mouth (B) and sealed air chamber (E) intercommunication, return water mouth (P1) and return water collection room (D) intercommunication.
2. The tandem sealing structure of a compressor according to claim 1, wherein: the outer shell (12) is provided with an inspection port (P2), and the inspection port (P2) is communicated with the sealed air chamber (E).
3. The tandem sealing structure of a compressor according to claim 1, wherein: the sealing group I (1), the sealing group II (2) and the sealing group IV (4) are carbon ring groups, and the sealing group III (3) is labyrinth seal.
4. A tandem seal structure of compressors according to claim 1 or 3, wherein: the seal assembly I (1) is positioned between the compression cavity and the seal water chamber (C), and the seal assembly IV (4) is positioned between the seal air chamber (E) and the bearing cavity.
5. A sealing system comprising a sealing structure according to any one of claims 1 to 4, wherein: the device comprises a water supply subsystem and an air supply subsystem, wherein the water supply subsystem is communicated with a sealing water gap (A), and the air supply subsystem is communicated with a sealing air port (B).
6. The sealing system of claim 5, wherein: the water supply subsystem comprises a water tank (21), the water tank (21) is communicated with a pressure pump (22), the pressure pump (22) is communicated with a cooling assembly (23), the cooling assembly (23) is communicated with a water filtering assembly (24), the water filtering assembly (24) is communicated with a metering assembly (25), the metering assembly (25) is communicated with a water pressure regulating assembly (26), the water pressure regulating assembly (26) is communicated with a sealed water gap (A), and a water return port (P1) is communicated with the water tank (21).
7. The sealing system of claim 6, wherein: the water tank (21) is a micro-positive pressure water tank, the water tank (21) is respectively communicated with the micro-positive pressure air supply assembly and the emptying assembly, a sight glass is arranged on a water return pipe between the water return port (P1) and the water tank (21), and the water return pipe extends into the water tank (21) and is inserted below the liquid level.
8. The sealing system of claim 5, wherein: the air supply subsystem comprises an air supply end (27), the air supply end (27) is communicated with an air filtering component (28), the air filtering component (28) is communicated with an air pressure regulating component (29), and the air pressure regulating component (29) is communicated with a sealing air port (B).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220511544.4U CN217206882U (en) | 2022-03-09 | 2022-03-09 | Series connection sealing structure of compressor and sealing system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220511544.4U CN217206882U (en) | 2022-03-09 | 2022-03-09 | Series connection sealing structure of compressor and sealing system thereof |
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| Publication Number | Publication Date |
|---|---|
| CN217206882U true CN217206882U (en) | 2022-08-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220511544.4U Active CN217206882U (en) | 2022-03-09 | 2022-03-09 | Series connection sealing structure of compressor and sealing system thereof |
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| Country | Link |
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| CN (1) | CN217206882U (en) |
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- 2022-03-09 CN CN202220511544.4U patent/CN217206882U/en active Active
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