CN219220818U - Shaft sleeve ejection-preventing component for dry gas sealing - Google Patents
Shaft sleeve ejection-preventing component for dry gas sealing Download PDFInfo
- Publication number
- CN219220818U CN219220818U CN202320798682.XU CN202320798682U CN219220818U CN 219220818 U CN219220818 U CN 219220818U CN 202320798682 U CN202320798682 U CN 202320798682U CN 219220818 U CN219220818 U CN 219220818U
- Authority
- CN
- China
- Prior art keywords
- ejection
- dry gas
- shaft
- thread
- shaft sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The utility model discloses an anti-ejection component of a shaft sleeve for dry gas sealing, which comprises the following components: the upper back ring comprises an upper base, a cylindrical protruding part and an external thread, wherein the upper base is provided with a threaded hole matched with a jackscrew, and the external thread is processed on the outer surface of the protruding part; the lower back ring comprises a lower base, a threaded hole matched with a jackscrew is formed in the lower base, the lower back ring further comprises an inner concave part, and an inner thread matched with an outer thread is processed on the surface of the inner concave part; and (5) jackscrews. Under the condition of failure of dry gas seal, the ejection-preventing component can effectively prevent the mechanical seal shaft sleeve from being top-mounted, and meanwhile, generated leakage is completely brought into a torch system through seal gas (nitrogen) to be discharged, so that conditions are created for maintenance; the reliability of the operation working condition of the pump using the ejection preventing component is obviously improved, and the risk of safe operation is reduced; the ejection preventing component has the advantages of simple structure, low cost and good use effect; the ejection preventing component is used on an EVA device, so that the risk of leakage expansion caused by ejection of a medium from a shaft sleeve is greatly reduced.
Description
Technical Field
The utility model relates to the technical field of mechanical sealing, in particular to an anti-ejection device for a dry gas sealing shaft sleeve, which is suitable for an EVA device.
Background
The dry gas seal, i.e. the gas seal without liquid lubrication, is a novel shaft end seal which uses a slotting seal technology for gas seal. The seal utilizes the fluid dynamics principle, and realizes the non-contact operation of the sealing end surface by arranging the dynamic pressure grooves on the sealing end surface, so that a gas film formed by the end surface completely blocks a sealing medium leakage channel with relatively low pressure, and zero leakage or zero escape of the sealing medium is realized.
In actual use, the dry gas seal is mainly used in the working conditions of toxic, harmful, inflammable and explosive media and the like. When the dry gas seal fails, the axial displacement of the shaft sleeve, namely the ejection of a part of the shaft sleeve, is caused by the high pressure of the medium, so that the leakage is increased, and part of the medium can be ejected along the shaft sleeve, thereby forming potential safety hazards. Especially, the production load of the EVA device can be improved, the required raw materials are increased, the operation load of a feed pump is improved, the leakage risk is increased along with the improvement, and the potential safety hazard is high.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and provides a shaft sleeve ejection preventing component matched with dry gas seal, which can effectively reduce the risk of ejection of a shaft sleeve after the dry gas seal fails, thereby ensuring safe and stable operation of a pump, and adopts the following technical scheme: an anti-ejection component of a shaft sleeve for dry gas sealing is characterized in that: the ejection preventing member includes: the upper back ring comprises an upper base, a cylindrical protruding part and an outer thread, wherein the upper base is provided with a threaded hole matched with a jackscrew, and the outer surface of the protruding part is provided with the outer thread; the lower back ring comprises a lower base, a concave part and an inner thread, wherein the lower base is provided with a threaded hole matched with a jackscrew, and the surface of the concave part is provided with the inner thread matched with the outer thread; and (5) jackscrews. The upper back ring and the lower back ring are fixed on one side of the pump shaft, namely the stress side of the dry gas seal, by jackscrews, so that the displacement of the machine seal shaft sleeve after the dry gas seal fails is prevented, and the purpose of preventing medium leakage is achieved.
The connection mode between the upper back ring and the pump shaft is as follows: an upper shaft hole is formed in the upper back ring, and the inner diameter of the upper shaft hole is slightly larger than the shaft diameter of the pump shaft.
The connection mode between the lower back ring and the pump shaft is as follows: the lower back ring is provided with a lower shaft hole, and the inner diameter of the lower shaft hole is slightly larger than the shaft diameter of the pump shaft.
The mounting position of the ejection preventing component is as follows: the ejection-preventing component is arranged between the mechanical seal shaft sleeve and the coupler II.
In order to achieve the purpose of fastening connection, the screwing length of the external thread and the internal thread after being matched is not less than 6 times of the thread pitch.
The utility model has the beneficial effects that: under the condition of failure of dry gas seal, the ejection-preventing component can effectively prevent the mechanical seal shaft sleeve from being top-mounted, and meanwhile, generated leakage is completely brought into a torch system through seal gas (nitrogen) to be discharged, so that conditions are created for maintenance; the reliability of the operation working condition of the pump using the ejection preventing component is obviously improved, and the risk of safe operation is reduced; the ejection preventing component has the advantages of simple structure, low cost and good use effect; the ejection preventing component is used on an EVA device, so that the risk of leakage expansion caused by ejection of a medium from a shaft sleeve is greatly reduced.
Drawings
Fig. 1 is a schematic diagram of a pump structure, fig. 2 is a schematic diagram of a dry gas sealing component structure, and fig. 3 is a schematic diagram of a shaft sleeve ejection preventing component structure.
Wherein 1 is a shaft sleeve ejection preventing member for dry gas sealing, 11 is an upper back ring, 111 is an upper base, 112 is a boss, 12 is a lower back ring, 121 is a lower base, 122 is an inner concave portion, 13 is a jackscrew, 2 is a schematic diagram of a pump structure, 21 is a motor, 22 is a coupling I, 23 is a bearing housing, 24 is a coupling II, 25 is a dry gas sealing member, 251 is a machine seal shaft sleeve, 252 is a fixed shaft sleeve, 253 is a spring, 254 is a heat dissipation channel, 255 is a moving ring, 256 is a stationary ring, 257 is an air intake hole, 258 is a sealing ring I, 259 is a sealing ring II, 2510 is a sealing ring III, 2511 is a sealing ring IV, 2512 is a high pressure chamber, 2513 is a sealing sleeve, 2514 is a push ring, 26 is a rotor, 27 is a casing, and 28 is a pump shaft.
Description of the embodiments
The following describes specific embodiments of the present utility model with reference to the drawings.
The utility model discloses an ejection-preventing component of a shaft sleeve for dry gas sealing, which comprises an upper back ring 11, a lower back ring 12 and a jackscrew 13. The upper back ring 11 is provided with an upper shaft hole, and the inner diameter of the upper shaft hole is slightly larger than the shaft diameter of the pump shaft 28. The upper back ring 11 comprises an upper base 111, a threaded hole matched with the jackscrew 13 is formed in the upper base 111, a cylindrical protruding portion 112 is further included, and external threads are machined on the outer surface of the protruding portion 112. The lower back ring 12 is provided with a lower shaft hole, and the inner diameter of the lower shaft hole is slightly larger than the shaft diameter of the pump shaft 28 matched with the lower shaft hole, which is generally 0.1mm. The lower back ring 12 comprises a lower base 121, a threaded hole matched with the jackscrew 13 is formed in the lower base 121, an inner concave part 122 is further formed in the surface of the inner concave part 122, an inner thread matched with an outer thread is formed on the surface of the inner concave part 122, a thread bush for connection is formed after the inner thread and the outer thread are matched, and the screwing length of the thread bush is not less than 6 times of the thread pitch (generally, not less than 5 times of the thread pitch is required).
The ejection preventing member is mounted between the seal sleeve 251 and the coupling ii 24, and the threaded sleeve is unscrewed so that the lower back ring 12 is in contact with the seal sleeve 251 and the upper back ring 11 is in contact with the coupling ii 24.
Fig. 3 shows the structure of the dry gas seal 25 below the ejection preventing member. The dry gas seal member 25 includes a stationary ring 256, a movable ring 255, a spring 253, a seal sleeve 252, and a fixed sleeve 252, and a high pressure chamber 2512 is formed between the casing 27, the stationary ring 256, the movable ring 255, the fixed sleeve 252, and a seal sleeve 2513. The gas inlet 257 is connected to an external gas supply, and high-pressure gas (nitrogen) enters the high-pressure chamber 2512 through the gas inlet 257. When the pump works, the pump shaft 28 drives the fixed shaft sleeve 252 to rotate, the fixed shaft sleeve 252 drives the movable ring 255 to rotate, and high-pressure gas in the high-pressure chamber 2512 enters the pressure inlet groove of the movable ring 255. Along with the high-speed rotation of the movable ring 255, the high-pressure gas in the air inlet groove pushes the stationary ring 256 to move on the sealing sleeve 2513 in the direction away from the movable ring 255, the stationary ring 256 extrudes the spring 253 through the push ring 2514, when the pushing force of the high-pressure gas is balanced with the acting force of the spring 253, the stationary ring 256 keeps stable, at the moment, a layer of air film is formed between the movable ring 255 and the stationary ring 256, a certain pressure is generated, and the movable ring 255 and the stationary ring 256 achieve sealing between rotating and non-rotating components under the condition of no contact, so that the joint of the pump shaft 28 and the casing 27 is sealed.
Of course, the above description is not intended to limit the utility model, but rather the utility model is not limited to the above examples, and variations, modifications, additions or substitutions within the spirit and scope of the utility model will be within the scope of the utility model.
Claims (5)
1. An anti-ejection component of a shaft sleeve for dry gas sealing is characterized in that: the ejection preventing member includes:
the upper back ring comprises an upper base, a cylindrical protruding part and an outer thread, wherein the upper base is provided with a threaded hole matched with a jackscrew, and the outer surface of the protruding part is provided with the outer thread;
the lower back ring comprises a lower base, a concave part and an inner thread, wherein the lower base is provided with a threaded hole matched with a jackscrew, and the surface of the concave part is provided with the inner thread matched with the outer thread;
and (5) jackscrews.
2. The dry gas sealing sleeve ejection preventing member according to claim 1, wherein: an upper shaft hole is formed in the upper back ring, and the inner diameter of the upper shaft hole is slightly larger than the shaft diameter of the pump shaft.
3. The shaft sleeve ejection preventing member for dry gas seal according to claim 1 or 2, wherein: the lower back ring is provided with a lower shaft hole, and the inner diameter of the lower shaft hole is slightly larger than the shaft diameter of the pump shaft.
4. The dry gas sealing sleeve ejection preventing member according to claim 1, wherein: the ejection-preventing component is arranged between the mechanical seal shaft sleeve and the coupler II.
5. The dry gas sealing sleeve ejection preventing member according to claim 1, wherein: the screwing length of the external thread and the internal thread after being matched is not less than 6 times of the thread pitch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320798682.XU CN219220818U (en) | 2023-04-07 | 2023-04-07 | Shaft sleeve ejection-preventing component for dry gas sealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320798682.XU CN219220818U (en) | 2023-04-07 | 2023-04-07 | Shaft sleeve ejection-preventing component for dry gas sealing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219220818U true CN219220818U (en) | 2023-06-20 |
Family
ID=86754206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320798682.XU Active CN219220818U (en) | 2023-04-07 | 2023-04-07 | Shaft sleeve ejection-preventing component for dry gas sealing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219220818U (en) |
-
2023
- 2023-04-07 CN CN202320798682.XU patent/CN219220818U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109681439B (en) | Deepwater pump with pressure compensation function | |
| CN110174260B (en) | Torque loading device of mechanical enclosed gear testing machine | |
| CN105953000A (en) | Medium-pressure high-speed rotating connector | |
| CN219220818U (en) | Shaft sleeve ejection-preventing component for dry gas sealing | |
| CN201318287Y (en) | Oil-free scroll compressor of anti-rotation and flexible mechanism | |
| CN201560811U (en) | Hydrostatic air-bearing composite shaft | |
| CN217422201U (en) | Non-contact sealing device for low-pressure rotary fluid pump | |
| CN216588524U (en) | Multifunctional wellhead leakage-proof sealing device | |
| CN202811476U (en) | Submersible pump mechanical seal device | |
| CN100458177C (en) | Built-in type parking sealing arrangement | |
| CN203272216U (en) | Mechanical labyrinth seal of nuclear main pump bidirectional thrust bearing circulation lubricating oil system | |
| CN201032023Y (en) | Rotary joint sealing device | |
| CN110131416B (en) | Online adjusting mechanism of mechanical seal pretightning force | |
| CN112483650A (en) | Radial support and oil cavity seal of gas compressor | |
| CN214304511U (en) | High temperature pump impeller connection structure | |
| CN210768928U (en) | Small-size turbojet engine rotor assembly structure | |
| CN210196106U (en) | Air compressor bearing set mechanism for fuel cell | |
| CN220059683U (en) | Expansion machine with power balance function | |
| CN220320119U (en) | Floating sealing structure for sliding bearing of compressor | |
| CN213235428U (en) | Balanced type novel single-screw pump capable of intermittently pressing oil | |
| CN220955730U (en) | Turbine impeller non-contact sealing system applied to high-pressure environment and turbine | |
| CN115585187A (en) | Bearing supported transmission shaft system and transmission equipment thereof | |
| CN213360545U (en) | Axial limiting mechanism for balance disc of multistage centrifugal pump | |
| CN215830786U (en) | Mechanical sealing device for pump | |
| CN218954023U (en) | Shaft seal structure with on-line overhaul function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |