CN215979902U - Combined sealing system of steam screw compressor or expander - Google Patents
Combined sealing system of steam screw compressor or expander Download PDFInfo
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- CN215979902U CN215979902U CN202122530068.9U CN202122530068U CN215979902U CN 215979902 U CN215979902 U CN 215979902U CN 202122530068 U CN202122530068 U CN 202122530068U CN 215979902 U CN215979902 U CN 215979902U
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Abstract
The utility model discloses a combined sealing system of a steam screw compressor or an expander, which comprises a main machine body, a high-pressure side end seat, a low-pressure side end seat, a female rotor and a male rotor, wherein the high-pressure side end seat is arranged on the main machine body; it is characterized in that: the shaft support sections at two ends of the female rotor and the male rotor are in a two-stage stepped shaft structure, and the diameter of an inner shaft of the shaft support section is larger than that of an outer shaft of the shaft support section; the bearing holes of the high-pressure side end seat and the low-pressure side end seat are of a two-stage stepped hole structure, and the diameter of an inner side hole is smaller than that of an outer side hole; a carbon ring sealing device is arranged between the inner side shaft of the shaft supporting section and the inner side hole of the bearing hole; a rotary sealing device is arranged between the outer side shaft of the shaft supporting section and the outer side hole of the bearing hole; and the bearing holes of the high-pressure side end seat and the low-pressure side end seat are radially provided with discharge holes corresponding to the positions between the carbon ring sealing device and the rotary sealing device. The sealing device has the advantages of simple and compact structure, convenience and easiness in installation, good sealing effect, capability of prolonging the service life of lubricating oil and improving the operation stability of the water vapor screw compressor or the expansion machine.
Description
Technical Field
The utility model relates to a water vapor compression or expansion treatment technology, in particular to a combined sealing system of a water vapor screw compressor or an expander.
Background
At present, steam is mainly used as a byproduct of industrial production in two utilization modes: the high-grade water vapor is used for driving the screw expander to do work, and further driving the generator to rotate so as to convert the expansion work into electric energy; the low-grade steam enters the screw compressor to be pressurized so as to improve the grade of the steam, thus effectively utilizing the latent heat of gasification of the steam and improving the energy utilization rate.
The screw expander and the screw compressor are used as core devices and have the characteristics of wide working condition adaptation range, simple structure, high reliability and the like, and the expansion application or the compression application of water vapor occupies an important position. In practical application, the screw expander and the screw compressor have basically the same structure, and the expansion or compression of water vapor is realized through the mutual matching of the female rotor and the male rotor which are arranged in the rotor cavity of the main machine body, but the flow directions of the water vapor during the expansion or compression are just opposite.
Compared with the traditional screw refrigerating compressor unit, the screw expander and the screw compressor do not have the contact mixing of lubricating oil and refrigerating working medium like the former screw expander and the screw compressor, and do not have corresponding oil separation equipment. In the traditional screw refrigerating compressor unit, the mixture of lubricating oil and refrigerating working medium can be treated by the oil separation equipment, and the lubricating oil is separated and recycled, so that the sealing problem of the refrigerating working medium and the lubricating oil does not exist. The screw expander and the screw compressor are oil-free screw equipment, and the key technology for ensuring the normal operation of the screw expander and the screw compressor is an isolated sealing structure of water vapor and lubricating oil, which has extremely important influence on the reliability of the water vapor screw equipment.
However, the isolation sealing structure of the existing screw expander and screw compressor is mostly a common mechanical shaft seal arranged at the shaft extension of the female rotor and the male rotor, the structure is single, the sealing performance is poor, the long-time operation requirements of the screw expander and the screw compressor cannot be met, water vapor is easy to leak from the rotor cavity of the main machine body to the lubricating oil at the shaft extension in the dynamic expansion or compression process, so that oil and water are mixed, the service life of the lubricating oil is shortened, and the operation stability of the screw expander and the screw compressor is poor.
In order to solve the above problems, those skilled in the art have been trying to solve the problem of water-oil sealing in screw expanders and screw compressors effectively, but no satisfactory progress has been made so far.
Disclosure of Invention
The utility model aims to provide a combined sealing system of a steam screw compressor or an expander, which has the advantages of simple and compact structure, convenient and easy installation, good sealing effect, prolonged service life of lubricating oil and improved running stability of the whole machine.
In order to achieve the purpose, the combined sealing system of the steam screw compressor or the expander comprises a main machine body of the compressor or the expander, a high-pressure side end seat and a low-pressure side end seat which are arranged at two ends of the main machine body, and a female rotor and a male rotor which are arranged in the main machine body and matched with each other, wherein a spiral section in the middle of the female rotor and the male rotor is positioned in a rotor cavity of the main machine body, and shaft support sections at two ends of the female rotor and the male rotor respectively extend into bearing holes of the high-pressure side end seat and the low-pressure side end seat; it is characterized in that:
the shaft support sections at two ends of the female rotor and the male rotor are in a two-stage stepped shaft structure, and the diameter of an inner shaft of the shaft support section is larger than that of an outer shaft of the shaft support section; correspondingly, the bearing holes of the high-pressure side end seat and the low-pressure side end seat are in a two-stage stepped hole structure, and the diameter of an inner side hole is smaller than that of an outer side hole;
a carbon ring sealing device is arranged between the inner side shaft of the shaft supporting section and the inner side hole of the bearing hole; a rotary sealing device is arranged between an outer side shaft of the shaft supporting section and an outer side hole of the bearing hole;
and the bearing holes of the high-pressure side end seat and the low-pressure side end seat are radially provided with discharge holes corresponding to the positions between the carbon ring sealing device and the rotary sealing device.
Preferably, a pressure relief groove is formed in the end face of the high-pressure side end seat combined with the main body, and the pressure relief groove is communicated with a bearing hole of the high-pressure side end seat. Therefore, the pressure of high-pressure steam in the rotor cavity of the main machine body on the carbon ring sealing device can be reduced, and the high-pressure steam is effectively prevented or delayed from entering the carbon ring sealing device.
Further, carbocycle sealing device is including installing carbocycle positioning frame in the inside hole of dead eye, the multichannel sealed carbocycle has been set up on the carbocycle positioning frame, sealed carbocycle with be rotatory movive seal cooperation structure between the inside axle of axle supporting section. Because a long and narrow annular space is formed between the inner side hole of the bearing hole and the inner side shaft of the shaft support section, a plurality of sealing carbon rings on the carbon ring positioning frame can form multi-layer sealing along the axial direction, so that the pressure of high-pressure steam can be attenuated layer by layer, and the high-pressure steam is effectively prevented from passing through the carbon ring sealing device.
Furthermore, the rotary sealing device comprises a sealing seat installed in an outer side hole of the bearing hole and a sealing sleeve installed on an outer side shaft of the shaft supporting section, a lip-shaped sealing ring is arranged in an inner wall annular groove of the sealing seat, and a rotary dynamic sealing matching structure is arranged between the lip-shaped sealing ring and the outer wall of the sealing sleeve. Because the outside hole of dead eye with form a wide mouthful annular space between the outside axle of axle support section, very make things convenient for the assembly of seal receptacle and seal cover, and seal receptacle and seal cover form secondary annular seal structure in the carbocycle sealing device outside, set up lip seal's labyrinth effect in addition, can effectively isolated a small amount of low pressure steam that escapes the carbocycle sealing device to prevent low pressure steam and the lubricating oil contact in the outside.
And furthermore, a thread groove is formed in the outer wall of the sealing sleeve, and the rotation direction of the thread groove can ensure that the thread groove applies pressure to the outside of the main machine body in the rotation process. Therefore, along with the rotating fit of the female rotor and the male rotor, the spiral groove on the outer wall of the sealing sleeve can pump lubricating oil, so that the lubricating oil can be prevented from entering the rotor cavity of the main machine body, and the lubricating oil is prevented from contacting with water vapor.
Still further, a soft metal material coating is arranged on the inner wall surface of the sealing seat, and the coating range of the soft metal material coating corresponds to the axial length of the thread groove. Therefore, a good fitting effect can be formed on the sealing surface of the sealing seat and the sealing sleeve, the abrasion of the sealing seat, the sealing sleeve and the thread groove thereof in the rotating operation is greatly reduced, the service life of the sealing seat is prolonged, and the sealing effect is enhanced.
Compared with the traditional common mechanical shaft seal structure, the utility model has the following beneficial effects: one of them, set up carbocycle sealing device and rotary seal device in grades at negative rotor and positive rotor both ends, synthesized and used multiple seal structure, wherein carbocycle is sealed, rotary seal, labyrinth seal isotructure combines together organically, can form a high-efficient complete sealed system, has greatly promoted the effect of isolated steam and lubricating oil. And secondly, the bearing holes of the high-pressure side end seat and the low-pressure side end seat are provided with the discharge holes, so that a small amount of low-pressure steam escaping from the carbon ring sealing device can be guided to be discharged from the discharge holes, and the steam is prevented from being enriched and condensed in the high-pressure side end seat and the low-pressure side end seat. Thirdly, in combination with the operation characteristics of the steam screw equipment, the pressure relief groove is formed in the end face where the high-pressure side end seat is combined with the main machine body, so that the pressure difference of the sealing structures on the two sides of the high-pressure side end seat and the low-pressure side end seat can be reduced, and the work load of the whole sealing system is reduced. Fourthly, as the water vapor is effectively prevented from entering the lubricating oil circulating system, the service life of the lubricating oil can be greatly prolonged, and the running reliability of the water vapor screw compressor or the expansion machine is improved. Fifthly, the whole set of combined sealing system has simple and compact structural design, convenient and fast installation and good sealing effect, and is suitable for popularization and application on various water vapor screw compressors or expanders.
Drawings
Fig. 1 is a schematic view of a combined sealing system of a steam screw compressor or an expander in a front view and a partial sectional structure.
Fig. 2 is a schematic longitudinal sectional structure of fig. 1.
Fig. 3 is an enlarged schematic view of a portion a of fig. 2.
Fig. 4 is a right side view of the high pressure side end block of fig. 1.
The components in the figures are numbered as follows: the high-pressure side end seat comprises a high-pressure side end seat 1, a main machine body 2, a low-pressure side end seat 3, a female rotor 4, a male rotor 5, a carbon ring sealing device 6 (wherein, a carbon ring positioning frame 6a and a sealing carbon ring 6b), a rotary sealing device 7 (wherein, a sealing seat 7a, a sealing sleeve 7b, a lip-shaped sealing ring 7c, a thread groove 7d and a soft metal material coating 7e), a discharge hole 8 and a pressure discharge groove 9.
Detailed Description
The utility model is described in further detail below with reference to the figures and specific examples, which should not be construed as limiting the utility model.
As shown in fig. 1 to 4, the combined sealing system of a steam screw compressor or an expander described in this embodiment includes a main body 2 of the compressor or the expander, a high-pressure side end seat 1 and a low-pressure side end seat 3 closely attached to two ends of the main body 2, and a female rotor 4 and a male rotor 5 which are installed inside the main body 2 and rotationally matched with each other. Wherein, the spiral section in the middle of female rotor 4 and male rotor 5 is located in the rotor cavity of main machine body 2, and the shaft support sections at both ends of female rotor 4 and male rotor 5 extend into the bearing holes of high pressure side end seat 1 and low pressure side end seat 3, respectively. The design key points are as follows:
the shaft support sections at the two ends of the female rotor 4 and the male rotor 5 are in a two-stage stepped shaft structure, and the diameter of an inner shaft is larger than that of an outer shaft; correspondingly, the bearing holes of the high-pressure side end seat 1 and the low-pressure side end seat 3 are in a two-stage stepped hole structure, and the diameter of the inner side hole is smaller than that of the outer side hole.
A carbon ring seal 6 is installed in an elongated annular space formed between the inner shaft of the shaft support section and the inner bore of the bearing bore. A rotary seal device 7 is installed in a wide-mouth space formed between the outer shaft of the shaft support section and the outer hole of the bearing hole. And a discharge hole 8 is formed in the bearing holes of the high-pressure side end seat 1 and the low-pressure side end seat 3 along the radial direction corresponding to the position between the carbon ring sealing device 6 and the rotary sealing device 7.
And a pressure relief groove 9 is formed in the end face of the high-pressure side end seat 1 combined with the main machine body 2, and the pressure relief groove 9 is communicated with a bearing hole of the high-pressure side end seat 1.
More specifically, the carbon ring sealing device 6 comprises a carbon ring positioning frame 6a installed in an inner hole of the bearing hole, seven sealing carbon rings 6b are embedded on the carbon ring positioning frame 6a, and a rotary and dynamic sealing matching structure is arranged between the sealing carbon rings 6b and an inner shaft of the shaft supporting section.
The rotary sealing device 7 comprises a sealing seat 7a installed in an outer side hole of the bearing hole and a sealing sleeve 7b installed on an outer side shaft of the shaft supporting section, a lip-shaped sealing ring 7c is installed in an inner wall annular groove of the sealing seat 7a, and a rotary dynamic sealing matching structure is arranged between the lip-shaped sealing ring 7c and the outer wall of the sealing sleeve 7 b.
In this embodiment, a thread groove 7d is further disposed on the outer wall of the sealing sleeve 7b, and the thread groove 7d is rotated in a direction that can ensure that it presses the outside of the main body 2 during the rotation process. A soft metal material coating 7e is provided on the inner wall surface of the seal holder 7a, and the coating range of the soft metal material coating 7e corresponds to the axial length of the thread groove 7 d.
The working and sealing principle of the utility model is as follows: after the water vapor enters a rotor cavity of a main machine body 2 of the screw compressor or the screw expander, the water vapor is gradually increased by compression pressure or gradually reduced by acting pressure due to the meshing action of the female rotor 4 and the male rotor 5 and then discharged out of the main machine body 2. Lubricating oil is filled between the bearing holes of the high pressure side end bearing 1 and the low pressure side end bearing 3 and the shaft support sections at both ends of the female rotor 4 and the male rotor 5, so that the machine operates normally. In order to isolate water vapor and lubricating oil, a pressure relief groove 9 arranged on the end face of the high-pressure side end seat 1 combined with the main machine body 2 can reduce the pressure of high-pressure water vapor in a rotor cavity of the main machine body 2 on the carbon ring sealing device 6, and prevent or delay the high-pressure water vapor from passing through the carbon ring sealing device 6. The seven sealing carbon rings 6b of the carbon ring sealing device 6 can form multi-layer sealing on the inner shaft of the shaft supporting section, so that the pressure of high-pressure steam can be attenuated layer by layer, and the leakage of the high-pressure steam can be effectively prevented. For a small amount of water vapor escaping after passing through the carbon ring sealing device 6, the water vapor can be discharged through the discharge holes 8 formed in the bearing holes of the high-pressure side end seat 1 and the low-pressure side end seat 3, so that the water vapor is prevented from being enriched and condensed. Furthermore, the rotary sealing device 7 can also form a new barrier to the escape of water vapour. The rotary sealing device 7 mainly comprises a sealing seat 7a, a sealing sleeve 7b and a lip-shaped sealing ring 7c, a soft metal material coating 7e arranged on the sealing seat 7a can form a good sealing surface with the sealing sleeve 7b, and a thread groove 7d arranged on the sealing sleeve 7b can generate pumping action on lubricating oil along with the rotation of the female rotor 4 and the male rotor 5, so that the lubricating oil is prevented from entering a rotor cavity of the main machine body 2 and contacting with water vapor. Meanwhile, the labyrinth seal structure of the lip seal 7c can isolate a small amount of escaped low-pressure steam from the lubricating oil to the maximum extent.
Because the combined sealing system is always in dynamic sealing and gaps exist between each sealing part and the shaft supporting sections at the two ends of the female rotor 4 and the male rotor 5, zero leakage of water vapor cannot be realized, and trace water vapor can still contact with lubricating oil. However, the combined sealing system designed by the utility model can strictly control the contact range near the bleed holes 8 on the bearing holes of the high-pressure side end seat 1 and the low-pressure side end seat 3 through pressure design, discharge the part of lubricating oil and water vapor, and prevent the part of oil vapor mixture from entering the lubricating oil circulation again, thereby ensuring the good running quality of the lubricating oil.
In conclusion, by means of the technical scheme, various sealing structures can be comprehensively utilized, and structures such as carbon ring sealing, rotary sealing, labyrinth sealing and the like are organically combined together, so that a high-efficiency complete sealing system can be formed; the design of the discharge hole is combined, so that the steam can be prevented from being enriched and condensed in the high-pressure side end seat and the low-pressure side end seat; the design of combining the pressure relief groove can reduce the pressure difference of the seal structures at the two sides of the high-pressure side end seat and the low-pressure side end seat, and the work load of the whole seal system is reduced. Like this, greatly promoted the effect of isolated steam and lubricating oil, and then improved the stability of complete machine operation. Meanwhile, the utility model has simple and compact structure, convenient and easy installation and can prolong the service life of the lubricating oil, and is suitable for popularization and application on various water vapor screw compressors or expanders.
The above description is only exemplary of the present invention and should not be taken as limiting the utility model, as any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A combined sealing system of a water vapor screw compressor or an expander comprises a main machine body (2) of the compressor or the expander, a high-pressure side end seat (1) and a low-pressure side end seat (3) which are arranged at two ends of the main machine body (2), and a female rotor (4) and a male rotor (5) which are arranged inside the main machine body (2) and are matched with each other, wherein a spiral section between the female rotor (4) and the male rotor (5) is positioned in a rotor cavity of the main machine body (2), and shaft supporting sections at two ends of the female rotor (4) and the male rotor (5) respectively extend into bearing holes of the high-pressure side end seat (1) and a bearing hole of the low-pressure side end seat (3); the method is characterized in that:
the shaft support sections at two ends of the female rotor (4) and the male rotor (5) are in a two-stage stepped shaft structure, and the diameter of an inner shaft of the shaft support section is larger than that of an outer shaft of the shaft support section; correspondingly, bearing holes of the high-pressure side end seat (1) and the low-pressure side end seat (3) are of a two-stage stepped hole structure, and the diameter of an inner side hole is smaller than that of an outer side hole;
a carbon ring sealing device (6) is arranged between the inner side shaft of the shaft supporting section and the inner side hole of the bearing hole; a rotary sealing device (7) is arranged between an outer side shaft of the shaft supporting section and an outer side hole of the bearing hole;
and the bearing holes of the high-pressure side end seat (1) and the low-pressure side end seat (3) are provided with a discharge hole (8) along the radial direction corresponding to the position between the carbon ring sealing device (6) and the rotary sealing device (7).
2. The water vapor screw compressor or expander combined seal system of claim 1, wherein: the end face of the high-pressure side end seat (1) combined with the main machine body (2) is provided with a pressure relief groove (9), and the pressure relief groove (9) is communicated with a bearing hole of the high-pressure side end seat (1).
3. The steam screw compressor or expander combined seal system of claim 1 or 2, wherein: carbocycle sealing device (6) is including installing carbocycle positioning frame (6a) in the interior side opening of dead eye, the multichannel sealed carbocycle (6b) has been set up on carbocycle positioning frame (6a), sealed carbocycle (6b) with be rotatory dynamic seal cooperation structure between the interior side axle of axle support section.
4. The steam screw compressor or expander combined seal system of claim 1 or 2, wherein: rotary seal device (7) are including installing seal receptacle (7a) in the outside hole of dead eye and installing epaxial seal cover (7b) in the outside of axle support section, be provided with lip seal circle (7c) in the inner wall annular of seal receptacle (7a), be rotatory dynamic seal cooperation structure between the outer wall of lip seal circle (7c) and seal cover (7 b).
5. The steam screw compressor or expander combined seal system of claim 4, wherein: the outer wall of the sealing sleeve (7b) is provided with a thread groove (7d), and the rotation direction of the thread groove (7d) can ensure that the thread groove applies pressure to the outside of the main machine body (2) in the rotation process.
6. The steam screw compressor or expander combined seal system of claim 5, wherein: a soft metal material coating (7e) is arranged on the inner wall surface of the sealing seat (7a), and the coating range of the soft metal material coating (7e) corresponds to the axial length of the thread groove (7 d).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122530068.9U CN215979902U (en) | 2021-10-20 | 2021-10-20 | Combined sealing system of steam screw compressor or expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122530068.9U CN215979902U (en) | 2021-10-20 | 2021-10-20 | Combined sealing system of steam screw compressor or expander |
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| CN215979902U true CN215979902U (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122530068.9U Active CN215979902U (en) | 2021-10-20 | 2021-10-20 | Combined sealing system of steam screw compressor or expander |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114589023A (en) * | 2022-05-10 | 2022-06-07 | 山东畜牧兽医职业学院 | High-performance injection device |
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2021
- 2021-10-20 CN CN202122530068.9U patent/CN215979902U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114589023A (en) * | 2022-05-10 | 2022-06-07 | 山东畜牧兽医职业学院 | High-performance injection device |
| CN114589023B (en) * | 2022-05-10 | 2022-07-12 | 山东畜牧兽医职业学院 | High-performance injection device |
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