CN215109552U - Composite sealing device for input shaft of coal gas pressurizing fan - Google Patents
Composite sealing device for input shaft of coal gas pressurizing fan Download PDFInfo
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- CN215109552U CN215109552U CN202120931132.1U CN202120931132U CN215109552U CN 215109552 U CN215109552 U CN 215109552U CN 202120931132 U CN202120931132 U CN 202120931132U CN 215109552 U CN215109552 U CN 215109552U
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Abstract
A composite sealing device for an input shaft of a coal gas pressurizing fan belongs to the technical field of coal gas pressurizing fan equipment and is used for sealing the input shaft of the coal gas pressurizing fan. The technical scheme is as follows: the piston ring is sleeved in a gap between a fan shell at the rear part of a fan impeller of the coal gas pressurizing fan and a fan input shaft, the air suction cover is sleeved on the fan input shaft at the rear part of the piston ring, the upper part of the air suction cover is connected with an exhaust fan connector, the piston ring is divided into a front part and a rear part, soft packing is embedded between the piston rings of the two parts for sealing, a closed oil nozzle is fixed on the fan shell outside the soft packing seal, an oil outlet pipe of the closed oil nozzle is connected with the upper part of the soft packing seal, and a flat tooth air seal is sleeved at the joint of the fan input shaft and one end of the air suction cover, which is far away from the fan shell. The utility model discloses the fan input shaft axle head coal gas leakage rate that has significantly reduced has guaranteed that the piston ring is sealed and the sealed life of wadding, has improved the efficiency of airing exhaust of exhaust fan simultaneously, ensures the safe operation in pressurization fan room.
Description
Technical Field
The utility model relates to a device that seals up coal gas forced draught fan input shaft belongs to coal gas forced draught fan equipment technical field.
Background
The main task of the gas pressurizing fan of the natural gas station is to pressurize and convey natural gas sent by a gas company, blast furnace gas produced by the company and converter gas mixed gas. At present, a sealing structure of an input shaft of a gas pressurizing fan is to arrange a piston ring on the input shaft to prevent gas from leaking from a gap on the periphery of the input shaft. However, in the running process of the coal gas pressurizing fan, the leakage of coal gas cannot be completely eradicated by only depending on the sealing of the piston rings at two sides, and the leakage amount is larger. The reason for this is that the piston ring seal must be lubricated with liquid to ensure the sealing effect, and therefore the piston ring seal is generally used for liquid type seals, and the piston ring seal is not highly applicable to gas seals. After friction in a certain operation period, the positions of the gaps of the piston rings slide, so that an airflow short circuit from the high-pressure side of the back of the fan impeller to the outer side of the fan shell is easily formed, and the throttling and pressure reducing sealing effects of the piston rings are reduced. The other reason is that no air sealing device is arranged between the suction hood and the fan shaft, and the gap is large, so that a large amount of useless air is sucked in the gap, and the effective air exhaust rate of the exhaust fan is reduced. Due to the above reasons, after the original single piston ring seal is operated for a period of time, the content of the gas in the pressurized fan room often exceeds the standard, the content of CO is often kept between 100 and 150PPM, the personal safety of post personnel is seriously threatened, and meanwhile, the normal maintenance and point inspection of equipment cannot be ensured. In view of this, the existing shaft seal form of the coal gas pressurizing fan does not have effective sealing performance, and equipment maintenance and personal safety cannot be guaranteed. It is therefore necessary to design an effective sealing device.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a composite sealing device of coal gas forced draught fan input shaft is provided, this kind of composite sealing device can prevent that coal gas forced draught fan operation cycle is terminal to take place the coal gas leakage, ensures fan room equipment safe operation.
The technical scheme for solving the technical problems is as follows:
the composite sealing device for input shaft of gas pressurizing fan includes piston ring, air sucking cover and exhaust fan, the piston ring is mounted in the gap between the fan casing and the input shaft of the fan, the air sucking cover is mounted on the input shaft of the fan, and the upper part of the air sucking cover is connected with the interface of the exhaust fan.
The composite sealing device of the input shaft of the coal gas pressurizing fan is characterized in that the closed oil nozzle is composed of a shell, a spiral cover, an oil outlet pipe, a spring and a steel ball, the spiral cover is arranged at the upper end of the shell, lubricating oil is filled in the shell, the oil outlet pipe is located on the bottom surface of the shell, the front end of the oil outlet pipe is connected with an oil filling hole of the fan shell, the spring is installed in the oil outlet pipe, and the steel ball is installed at the upper end of the oil outlet pipe.
The utility model has the advantages that:
the utility model discloses a piston ring is sealed, the wadding is sealed, closed glib talker, the compound sealing device of flat tooth atmoseal combination, this kind of sealing device not only can reduce fan input shaft axle head coal gas leakage quantity effectively, sealed effect and the life of piston ring sealing and wadding sealing have been guaranteed through filling lubricating oil moreover, closed glib talker can effectively prevent to leak coal gas by the glib simultaneously, the flat tooth atmoseal has improved the efficiency of airing exhaust of exhaust fan greatly, make fan room operation environment obviously improve, CO content can reduce to 0PPM, can effectively prevent CO poisoning occurence of failure, ensure pressurization fan room safe operation.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic structural view of the closed type oil nozzle.
The figures are labeled as follows: the device comprises a fan impeller 1, a fan shell 2, an exhaust fan interface 3, an expansion ring 4, a soft packing seal 5, a fan input shaft 6, a closed oil nozzle 7, a flat tooth air seal 8, an air suction cover 9, a shell 10, a spiral cover 11, an oil outlet pipe 12, a spring 13 and a steel ball 14.
Detailed Description
The utility model discloses constitute by piston ring 4, soft packing seal 5, closed glib talker 7, flat tooth atmoseal 8, suction hood 9 and exhaust fan.
Fig. 1 shows that a piston ring 4 is sleeved in a gap between a fan shell 2 at the rear part of a fan impeller 1 of a coal gas pressurizing fan and a fan input shaft 6 for sealing. The piston ring 4 is divided into a front part and a rear part in a gap between the fan housing 2 and the fan input shaft 6.
Pressurized coal gas flows into a shaft seal position of a fan input shaft 6 from a gap between the back of a fan impeller 1 and a fan shell 2, and is sealed by a section of piston ring 4, the highest temperature in operation does not exceed 70 ℃, and the highest linear velocity is 7.7 m/s; the gas enters a stage 5 of soft packing sealing after throttling and pressure reduction by the section of the piston ring 4, the soft packing at the section can be fully lubricated and cooled by the added lubricating oil, and meanwhile, the gas at the section is mixed gas and almost does not contain oxygen, so that the phenomena of heating, oxidation and aging of the soft packing can be avoided; then the gas enters the sealing stage of the second section of the piston ring 4, the throttling and pressure reduction are further carried out at the stage, and a small amount of gas overflows to the shaft sealing end of the fan input shaft 6.
Fig. 1 shows that a soft packing seal 5 is embedded between two expansion rings 4, a closed oil nozzle 7 is fixed on a fan shell 2 outside the soft packing seal 5, the fan shell 2 is provided with an oil filling hole, and two ends of the oil filling hole are respectively connected with the closed oil nozzle 7 and the upper part of the soft packing seal 5. The closed oil nozzle 7 injects lubricating oil into the soft filler seal 5 through the oil injection hole, so that the sealing effect of the piston ring 4 and the soft filler 5 is ensured, and the service lives of the piston ring 4 and the soft filler 5 can be prolonged.
Fig. 1 shows that a fan input shaft 6 at the rear part of a fan shell 2 of the coal gas pressurizing fan is sleeved with an air suction cover 9, the upper part of the air suction cover 9 is connected with an exhaust fan interface 3, and a flat tooth air seal 8 is sleeved at the joint of the fan input shaft 6 and one end of the air suction cover 9 far away from the fan shell 2. The existence of the exhaust fan can ensure that the interior of the air suction hood 9 is kept in a negative pressure state, the state guarantees that air flows into a gap between the air suction hood 9 and the fan shell 2, and the air can play a role of air sealing to prevent gas from leaking out of the gap; the flat tooth air seal 8 positioned at the gap between the air suction cover 9 and the fan input shaft 6 greatly reduces the air inflow of the gap, and under the condition of certain exhaust fan exhaust volume, the air seal air volume at the gap between the air suction cover 9 and the fan shell 2 is equivalently enhanced. The leaked coal gas and air sucked by the gap between the suction hood 9 and the fan shell 2 and the fan input shaft 6 are mixed in the suction hood 9 and then are sucked by the exhaust fan and discharged into the outdoor atmosphere.
Fig. 1 and 2 show that the closed type oil nozzle 7 comprises a shell 10, a screw cap 11, an oil outlet pipe 12, a spring 13 and a steel ball 14. The upper end of the shell 10 is provided with a spiral cover 11, the shell 10 is filled with lubricating oil, the oil outlet pipe 12 is positioned on the bottom surface of the shell 10, the front end of the oil outlet pipe 12 is connected with an oil filling hole of the fan shell 2, a spring 13 is arranged in the oil outlet pipe 12, a steel ball 14 is arranged at the upper end of the oil outlet pipe 12, the spring 13 and the steel ball 14 play a role in sealing the oil outlet pipe 12, and gas is prevented from escaping after entering the closed oil nozzle 7.
The utility model discloses an embodiment as follows:
the piston ring 4 is divided into a front part and a rear part, and each part is provided with four piston rings for eight rings;
the length of the soft stuffing seal 5 is 20 mm;
the type of the closed type oil nozzle 7 is 20cm3M14*1.5；
The number of teeth of the flat-tooth air seal 8 is 3, and the height is 5 mm.
Claims (2)
1. The utility model provides a compound sealing device of coal gas booster fan input shaft, it includes piston ring (4), suction hood (9), exhaust fan, in the clearance between fan casing (2) and fan input shaft (6) at piston ring (4) suit at coal gas booster fan's fan impeller (1) rear portion, suction hood (9) suit is on fan input shaft (6) at piston ring (4) rear portion, the upper portion and the exhaust fan interface (3) of suction hood (9) are connected, its characterized in that: the expansion ring (4) is divided into a front part and a rear part in a gap between the fan shell (2) and the fan input shaft (6), a soft filler seal (5) is embedded between the expansion ring (4) of the two parts, a closed oil nozzle (7) is fixed on the fan shell (2) outside the soft filler seal (5), the fan shell (2) is provided with an oil filling hole, two ends of the oil filling hole are respectively connected with an oil outlet pipe (12) of the closed oil nozzle (7) and the upper part of the soft filler seal (5), and a flat tooth air seal (8) is sleeved at the joint of one end, far away from the fan shell (2), of the fan input shaft (6) and the air suction hood (9).
2. The composite sealing device of the input shaft of the gas pressurizing fan as claimed in claim 1, wherein: closed glib talker (7) comprise casing (10), spiral cover (11), play oil pipe (12), spring (13), steel ball (14), and there is spiral cover (11) upper end of casing (10), and casing (10) intussuseption is filled with lubricating oil, goes out oil pipe (12) and is located the bottom surface of casing (10), and the front end of going out oil pipe (12) is connected with the oil filler point of fan casing (2), installs spring (13) in going out oil pipe (12), and steel ball (14) are installed to the upper end of going out oil pipe (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120931132.1U CN215109552U (en) | 2021-04-30 | 2021-04-30 | Composite sealing device for input shaft of coal gas pressurizing fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120931132.1U CN215109552U (en) | 2021-04-30 | 2021-04-30 | Composite sealing device for input shaft of coal gas pressurizing fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215109552U true CN215109552U (en) | 2021-12-10 |
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ID=79290960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120931132.1U Active CN215109552U (en) | 2021-04-30 | 2021-04-30 | Composite sealing device for input shaft of coal gas pressurizing fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215109552U (en) |
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2021
- 2021-04-30 CN CN202120931132.1U patent/CN215109552U/en active Active
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