CN102705238A - Shaft-seal-free series connection-type multi-stage screw compressor - Google Patents
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Abstract
The invention provides a shaft-seal-free series connection-type multi-stage screw compressor, belongs to the technical field of machinery, and solves the problems in the prior art that the existing series connection-type multi-stage screw compressor is liable to leak and can not provide a large compression pressure. The shaft-seal-free series connection-type multi-stage screw compressor comprises a plurality of independent compression main machines which are in series connection, wherein the compression main machine of each stage has an independent housing, the volumes of the individual stages of compression main machines in series connection are gradually reduced from front to back, the screw shafts of two adjacent compression main machines are in transmission connection through a transmission connector, the housings of two adjacent compression main machines are connected together through a sealing member, a return oil through-hole is formed in the bottom of a flanged drum, and the return oil through-hole is connected with the air inlet of the previous stage of main machine. The shaft-seal-free series connection-type multi-stage screw compressor is formed by series connection of the multiple independent compression main machines and convenient for routine maintenance. The volume of the previous stage of main machine is larger than that of the next stage of main machine, which can effectively achieve the effect of multi-stage boost, so that the exhaust pressure of the next stage of main machine is larger than that of the previous stage of main machine. The shaft-seal-free series connection-type multi-stage screw compressor has the advantages of compact structure and no risk of leakage.
Description
Technical field
The invention belongs to field of mechanical technique, relate to the universal air compressor in a kind of engineering goods, particularly a kind of series type multi-stage screw compressor that does not have the axle envelope.
Background technique
The series type multistage compressor is a kind of form of helical-lobe compressor, because compact structure, transmission efficiency is high and extensively adopted; Disclose a kind of coaxial more piece single screw air compressor like Chinese patent (patent No. ZL200420042311.6), comprised that driving and the control gear of a housing, one group of drive screw, one group of intelligence regulates automatic controller, a deaerator that is used for Oil-gas Separation and lubricant oil is provided of stable gas pressure, placed main shaft in the housing; The driving of drive screw and control gear drive main shaft, have suction port, air outlet and valve in the housing, have the screw rod of coaxial more piece screw thread on the main shaft; The star-wheel engagement of screw rod is closed in the screw rod of coaxial more piece screw thread and many assembly, and the star-wheel that is closed screw engages by many assembly constitutes screw rod star-wheel pair, in housing, has joint between joint and the joint and adds a grade gas transmission road; This structure can improve the efficiency of compressor to a certain extent; Convenient transportation, and high-pressure air can also be provided, but the compressor of this whole series type structure is a multistage compressor; Many cover screw rod star-wheel revolute pairs are coaxial to be loaded on same housing; Having relatively high expectations of the casting of whole housing and processing, and also very complicacy of the assembling of each parts are particularly broken down and when needing maintenance when a cover screw rod star-wheel revolute pair wherein; Need whole compressor is taken apart, waste time and energy.In addition owing to screw rod star-wheel revolute pair in this compressor all fixedly mounts; The discharge capacity relative fixed that causes its pressurized gas is generally the quantitative stack of common separate unit compressor, can not optionally adjust; Operation inconvenience has very influenced application flexibility in real work.Thus, a kind of novel compressor has appearred, like the Chinese patent (patent No.: ZL200820050878.6) on the market; A kind of tandem single screw compressor is disclosed; It is connected in series by some platform independent compression main frames and forms, and the secondary main shaft of the screw rod star-wheel of adjacent compression main frame connects transmission through the transmission joint part, and the main shaft input end of first compression main frame is connected with a drive motor; The housing of each compression main frame is housing independently separately, and this housing links together through flange assembly.Compressor in this patent is in series by the compression main frame of a plurality of same capabilities, and secondary compression main frame can not be realized effective pressure-bearing rotary seal, can't accomplish high pressure output, promptly can't realize surpassing the delivery pressure of 1.6Mpa, uses narrow limitation bigger.In addition, the main frame of the helical-lobe compressor of the type and motor are through driving mechanism transmissions such as belt pulley, gear or coupling, and its input shaft end or output terminal generally keep sealing through mechanical seal or PTFE (polytetrafluoroethylene) axle envelope; Because of compressor operating under the environment of high temperature, high pressure; And two types of above-mentioned Sealings all are easy to leak, and only are about 6000 hours their working life, at 100,000 hours life periods of air compressor; Need to change tens times by the professional person; Add pollution and shutdown loss that leakage causes, the axle envelope becomes a source of trouble of helical-lobe compressor, has had a strong impact on the manufacturing efficiency and the economic benefit of helical-lobe compressor.
Wherein common with two stage compressor.Just adopted the form of series type like the two section of the TS of U.S. Shou Li company series transfiguration helical-lobe compressors, from last century the eighties begin to sell in China, because of it is a two stage compression; Efficient is high, and energy-conservation, the market retention is bigger; But because TS series is for there being the design of axle envelope; The pressure-bearing rotary seal of second level main frame is a difficult problem, can't accomplish high pressure output, promptly can't realize surpassing the delivery pressure of 1.6Mpa.Though the medium and high pressure helical-lobe compressor can be implemented in theory simultaneously, do not see the Related product listing always, there is not engineering prototype to occur yet,
Summary of the invention
The objective of the invention is to have the problems referred to above to existing technology; Proposed that a kind of compact structure, Transmitted chains are simple and reliable, the series type multi-stage screw compressor of the no axle envelope of no risk of leakage; Sealing difficult problem between each stage compressor of solution series type multi-stage screw compressor; Reach easy assembling and easy-to-maintain purpose simultaneously, thereby the commercialization that realizes the mesohigh helical-lobe compressor is promoted.
The object of the invention can be realized through following technical proposal: a kind of series type multi-stage screw compressor that does not have the axle envelope; Comprise the some platform independent compression main frames composition that is connected in series; Described compression main frame at different levels has separately housing alone, it is characterized in that the volume of the compression main frame of described series connection at different levels reduces from front to back successively; The screw axis of described adjacent compression main frame connects transmission through the transmission joint part; Link together through Sealing between the housing of described adjacent compression main frame, the bottom of described flange tube is provided with an oil return through-hole, and described oil return through-hole is connected with the suction port of previous stage main frame.
The multi-stage screw compressor is in series by the compression main frame of many platform independent in the present technique scheme; Be convenient to daily maintenance; Wherein the volume of previous stage main frame can be realized multistage supercharging effectively greater than back one-level main frame, thereby the exhaust pressure of one-level main frame is greater than the previous stage main frame after making.This multi-stage screw compressor is through being provided with the spill port on the flange tube simultaneously; Can the long-pending oil that produce in the flange tube be imported in the main frame of previous stage; Avoid on the input shaft of the output shaft of previous stage and back one-level, shaft seal structure being set, thereby avoided the hidden danger of oil accident.
In the series type multi-stage screw compressor of above-mentioned no axle envelope, the screw axis input end of described compression main frames at different levels is positioned at suction port one side, and the screw axis output terminal is positioned at relief opening one side, and afterbody compression main frame does not have output terminal.Be interconnected between previous stage main frame and the back one-level main frame in the present technique scheme, promptly the high voltage terminal of previous stage main frame communicates with the low voltage terminal of back one-level main frame, and pressure between the two equates, can avoid the problem of one-way leakage in the course of the work effectively.
In the series type multi-stage screw compressor of above-mentioned no axle envelope, the screw axis input end of described compression main frames at different levels is arranged on the right-hand axis bearing, and the screw axis output terminal is arranged on the left-hand axis bearing.
In the series type multi-stage screw compressor of above-mentioned no axle envelope; Described first order compression main frame comprises first order screw axis, first order oil cut-off valve, atmospheric valve and first order outlet valve; The input end of described first order screw axis is provided with at least one undergauge annular groove; Be provided with the oil-return groove that is connected with above-mentioned undergauge annular groove in the described first order right-hand axis bearing, described oil-return groove has the drainback passage with the body intracavity inter-connection of first order main frame.In the present technique scheme; The suction port of first order compression main frame is in operation, and according to operating mode different (load or unload), is no pressure or negative pressure state with respect to atmospheric pressure; So the screw axis input end is arranged on body suction port one side; The situation that the lubricant oil with pressure of being in operation just not leaks, the lubricant oil that splashes in the body simultaneously flow in the outer undergauge annular groove of screw axis input end through the bearing on right side, is thrown to by centrifugal force in the oil-return groove of right-hand axis bearing; Get back in the body through the drainback passage between oil-return groove and the body at last, just do not have the situation of oil leak in service.Cooperates between undergauge annular groove and the oil-return groove in the present technique scheme simultaneously to form labyrinth seal structure, can realize good sealing effect, avoid the oil leakage of inside.
In the series type multi-stage screw compressor of above-mentioned no axle envelope, also be provided with on the described first order right-hand axis bearing one be used to be communicated with atmospheric valve and first order right-hand axis bearing inner chamber relieving device.Relieving device is arranged on the top of first order screw axis; And be connected with the outside of first order screw axis; When compressor shutdown, the pressurized air that atmospheric valve is emitted can form the pressure area in the axle surface below relieving device, can stop the oil leak in the body effectively.
In above-mentioned no axle envelope oil spout single-screw air compressor, described drainback passage is the spill port that is arranged on the first order right-hand axis bearing, and described spill port is communicated with the body inner chamber of first order main frame and the bottom of oil-return groove.
In the series type multi-stage screw compressor of above-mentioned no axle envelope, described Sealing is the flange tube of the hollow tube-shape of two ends with flange, and the two ends of described flange tube are connected through fastening piece with the housing that compresses main frame.
In the series type multi-stage screw compressor of above-mentioned no axle envelope, offer mount inlet on the sidewall of described flange tube, described mount inlet is provided with dismountable pressure-bearing cover plate, described pressure-bearing cover plate and the sealing of flange tube.The pressure-bearing pressure of pressure-bearing cover plate and flange tube is provided with dismountable pressure-bearing cover plate greater than the exhaust pressure of previous stage main frame, can assemble easy access and maintenance through mount inlet to the transmission joint part.
In the series type multi-stage screw compressor of above-mentioned no axle envelope, the left-hand axis bearing of an end of described flange tube and previous stage compression main frame, the other end is connected with the right-hand axis bearing of back one-level compression main frame.
In above-mentioned no axle envelope oil spout single-screw air compressor, described first order outlet valve is an one-way exhaust valve.One-way exhaust valve is in closed state when compressor shutdown, it matches with atmospheric valve, guarantees the inner sealing of first order compression main frame.
In above-mentioned a kind of series type multi-stage screw compressor that does not have an axle envelope, described transmission joint part is a coupling.
Compared with prior art, the present invention has following advantage: 1, each compression main frame is linked together through the flange tube, and compact structure, and have good sealing property, and can guarantee multistage compression, realize high pressure output; 2, connect the screw axis of each compression main frame through coupling, Transmitted chains is simple and reliable, and cost is low, and reliability is high, is convenient to promote; 3, be used to connect each sealing flange tube bottom that compresses main frame and be provided with spill port; Can the long-pending oil that produce in the compression main frame be imported in the previous stage compression main frame; Avoid on the input shaft of the output shaft of previous stage and back one-level, shaft seal structure being set; Realized no shaft sealing, avoided risk of leakage, long service life; 4, on the flange tube mount inlet is set, need not entire machine is dismantled the assembling that can realize the coupling between each compression main frame, also have simultaneously and be easy to the advantage of overhauling and safeguarding.
Description of drawings
Fig. 1 is embodiment's one among the present invention a cross section structure schematic representation.
Fig. 2 is embodiment's two among the present invention a cross section structure schematic representation.
Among the figure, 1, first order main frame; 2, second level main frame; 4, flange tube; 4a, oil return through-hole; 4b, mount inlet; 4c, pressure-bearing cover plate; 5, first order screw axis input end; 6, first order screw axis output terminal; 7, second level screw axis input end; 8, coupling; 9, first order outlet valve; 10, second level outlet valve; 11, first order suction port; 12, second level suction port; 13, first order left-hand axis bearing; 14, first order right-hand axis bearing; 15, second level right-hand axis bearing; 16, second level left-hand axis bearing; 17, first order oil cut-off valve; 18, second level oil cut-off valve; 19, relieving device; 20, the undergauge annular groove one; 21, oil-return groove; 22, spill port; 23, the undergauge annular groove two; 24, connecting tube; 25, second level screw axis output terminal; 26, third level screw axis input end.
Embodiment
Below be specific embodiment of the present invention and combine accompanying drawing, technological scheme of the present invention is done further to describe, but the present invention is not limited to these embodiments.
Embodiment one:
With reference to Fig. 1; The series type multi-stage screw compressor of the no axle envelope in the present embodiment is formed by two stage compression main frame serial connection; Be respectively first order main frame 1 and second level main frame 2; Wherein the air displacement of first order main frame 1 is greater than the air displacement of second level main frame 2, and the exhaust pressure of second level main frame 2 is greater than the exhaust pressure of first order main frame 1.
The first order screw axis input end 5 of first order main frame 1 is supported in the body through first order right-hand axis bearing 14 and first order left-hand axis bearing 13 respectively with first order screw axis output terminal 6; With the first order of formation compressors such as left and right sides star-wheel mechanism, first order outlet valve 9, first order oil cut-off valve 17, first order screw axis input end 5 is positioned at first order suction port 11 1 sides.The screw axis of second level main frame 2 is fixed in the body through second level right-hand axis bearing 15 and second level left-hand axis bearing 16 respectively; This screw axis only has second level screw axis input end 7; And the no-output end; Screw axis and left and right sides star-wheel mechanism, second level outlet valve 10, second level oil cut-off valve 18 etc. constitute the second level of compressor, and second level screw axis input end 7 is positioned at second level suction port 12 1 sides.Flange tube 4 through pressure-bearing type between first order main frame 1 and the second level main frame 2 be linked together; First order screw axis output terminal 6 is connected with second level screw axis input end 7 through coupling 8, and the driving force of this two-stage main frame is imported and transmitted by first order screw axis input end 5.Present embodiment offers mount inlet 4a for ease of the assembling of coupling 8 on the sidewall of flange tube 4, mount inlet 4a is provided with dismountable pressure-bearing cover plate 4c, pressure-bearing cover plate 4c and 4 sealings of flange tube.The bottom of flange tube 4 is provided with an oil return through-hole 4a; Oil return through-hole 4a is connected through connecting tube 24 with first order suction port 11; Because the machine oil in the body can be input to first order suction port 11 through this connecting tube 24; Solved the leakage and the machine oil problem of flange tube 4, made that simultaneously need not to be provided with a Sealing such as axle envelope grade on first order left-hand axis bearing 13 and the second level right-hand axis bearing 15 can guarantee good sealing property.
The set inside of first order right-hand axis bearing 14 has oil-return groove 21, spill port 22 and relieving device 19; Spill port 22 is horizontally installed on the bottom of oil-return groove 21; Its two ends respectively with the intracavity inter-connection of oil-return groove 21 and compressor block 1; Relieving device 19 is vertically set on the right-hand member of first order right-hand axis bearing 14, and its upper end can be connected to atmospheric valve (not indicating among the figure) through blow-down pipe, and the lower end is switched to the outside of first order screw axis input end 5.First order screw axis input end 5 is equipped with 2 undergauge annular grooves, and wherein the undergauge annular groove 1 in left side aligns with oil-return groove 21, and both match and form the labyrinth seal chamber, and the undergauge annular groove 2 23 on right side leads to the lower ends of relieving device 19.
During the running of present embodiment main frame; The lubricant oil that undergauge annular groove 1 on the first order screw axis input end 5 of first order main frame 1 can will overflow is thrown on the oil-return groove 21; Get back in the body through spill port 22; And directly be communicated with through flange tube 4 between first order main frame 1 and the second level main frame 2, the pressure at two ends equates and can be in the problem of unidirectional leakage that promptly present embodiment is in operation the situation of oil leak can not take place.
During the present embodiment main shut-down system; Have in the short time in its body and be full of≤process of 0.06Mpa (laboratory data) low-pressure air; This time; The pressurized air of emitting through atmospheric valve can form the pressure area on the axle surface of the first order screw axis input end 5 below the relieving device 19 of first order right-hand axis bearing 14, stops the oil leak in the first order main frame 1.Because the time that the low-pressure air that is full of in the short time in the first order main frame 1 is released fully is less than the emptying time of system greatly, when not having pressure in the first order main frame 1, just there has not been the situation of leaking yet.
Embodiment two:
With reference to Fig. 2; The series type multi-stage screw compressor of the no axle envelope in the present embodiment is formed by three grades of compression main frame serial connections; Be respectively first order main frame 1, second level main frame 2 and third level main frame 3; Air displacement wherein: first order main frame 1>second level main frame 2>third level main frame 3, exhaust pressure: third level main frame 3>second level main frame 2>first order main frame 1, the screw axis input end of main frames at different levels is all in suction port one side; All in relief opening one side, wherein the screw axis of third level main frame 3 does not have output terminal to the screw axis output terminal.Between the main frames at different levels through with embodiment one in structure is identical, size is different flange tube and coupling be connected.Be in the present embodiment; First order main frame 1 structure is identical with first order main frame 1 among the embodiment one; Third level main frame 3 structures are identical with second level main frame 2 among the embodiment one; Second level main frame 2 is compared with the second level main frame among the embodiment one; Only had more one and be used for the second level screw axis output terminal 24 that is connected with the screw axis input end of third level main frame 3, this second level screw axis output terminal 25 is arranged on the second level left-hand axis bearing 16, and links through coupling with third level screw axis input end 26.
During the running of present embodiment main frame; The lubricant oil that undergauge annular groove 1 on the first order screw axis input end 5 of first order main frame 1 can will overflow is thrown on the oil-return groove 21; Get back in the body through spill port 22; And directly be communicated with through flange tube and coupling between first order main frame 1 and second level main frame 2 and first order main frame 2 and the second level main frame 3, the pressure at two ends equates and can be in the problem of unidirectional leakage that promptly present embodiment is in operation the situation of oil leak can not take place.
During the present embodiment main shut-down system; Have in the short time in its body and be full of≤process of 0.06Mpa (laboratory data) low-pressure air; This time; The pressurized air of emitting through atmospheric valve can form the pressure area on the axle surface of the first order screw axis input end 5 below the relieving device 19 of first order right-hand axis bearing 14, stops the oil leak in the first order main frame 1.Because the time that the low-pressure air that is full of in the short time in the first order main frame 1 is released fully is less than the emptying time of system greatly, when not having pressure in the first order main frame 1, just there has not been the situation of leaking yet.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as first order main frame 1, second level main frame 2, flange tube 4, oil return through-hole 4a, mount inlet 4b, pressure-bearing cover plate 4c, first order screw axis input end 5, first order screw axis output terminal 6, second level screw axis input end 7, coupling 8, first order outlet valve 9, second level outlet valve 10, first order suction port 11, second level suction port 12, first order left-hand axis bearing 13, first order right-hand axis bearing 14, second level right-hand axis bearing 15, second level left-hand axis bearing 16, first order oil cut-off valve 17, second level oil cut-off valve 18, relieving device 19, undergauge annular groove 1, oil-return groove 21, spill port 22, undergauge annular groove 2 23, connecting tube 24, second level screw axis output terminal 25, third level screw axis input end 26 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; It all is contrary with spirit of the present invention being construed to any additional restriction to them.
Claims (10)
1. one kind is not had the series type multi-stage screw compressor that axle seals; Comprise the some platform independent compression main frames composition that is connected in series; Described compression main frame at different levels has separately housing alone, it is characterized in that the volume of the compression main frame of described series connection at different levels reduces from front to back successively; The screw axis of described adjacent compression main frame connects transmission through the transmission joint part; Link together through Sealing between the housing of described adjacent compression main frame, described Sealing is provided with an oil return through-hole (4a), and described oil return through-hole (4a) is connected with the suction port of previous stage main frame.
2. the series type multi-stage screw compressor that does not have the axle envelope according to claim 1; It is characterized in that; The screw axis input end of described compression main frames at different levels is positioned at suction port one side, and the screw axis output terminal is positioned at relief opening one side, and afterbody compression main frame does not have output terminal.
3. the series type multi-stage screw compressor that does not have the axle envelope according to claim 2 is characterized in that the screw axis input end of described compression main frames at different levels is arranged on the right-hand axis bearing, and the screw axis output terminal is arranged on the left-hand axis bearing.
4. the series type multi-stage screw compressor that does not have the axle envelope according to claim 3; It is characterized in that; Described first order compression main frame comprises first order oil cut-off valve (17), atmospheric valve and first order outlet valve (9); Described first order screw axis input end (5) is arranged on the first order right-hand axis bearing (14); Described first order screw axis input end (5) is provided with at least one undergauge annular groove, is provided with the oil-return groove (21) that is connected with above-mentioned undergauge annular groove in the described first order right-hand axis bearing (14), and described oil-return groove (21) has the drainback passage with the body intracavity inter-connection of first order main frame (1).
5. the series type multi-stage screw compressor that does not have the axle envelope according to claim 4 is characterized in that, also is provided with the relieving device (19) of a connection atmospheric valve and first order right-hand axis bearing (14) inner chamber on the described first order right-hand axis bearing (14).
6. the series type multi-stage screw compressor that does not have the axle envelope according to claim 4; It is characterized in that; Described drainback passage is for being arranged on the spill port (22) on the first order right-hand axis bearing (14), and described spill port (22) is communicated with the body inner chamber of first order main frame (1) and the bottom of oil-return groove (21).
7. the series type multi-stage screw compressor that does not have the axle envelope according to claim 4 is characterized in that described first order outlet valve (9) is an one-way exhaust valve.
8. according to claim 1 or 2 or 3 or 4 or 5 or the 6 or 7 described series type multi-stage screw compressors that do not have the axle envelope; It is characterized in that; Described Sealing is the flange tube (4) of the hollow tube-shape of two ends with flange; Described flange tube (4) is horizontally installed between two adjacent compression main frames, and its two ends are connected through fastening piece with the housing of compression main frame, and described spill port (4a) is arranged on the sidewall that is positioned at the bottom of flange tube (4).One end of flange tube (4) is connected with the left-hand axis bearing of previous stage compression main frame, and the other end is connected with the right-hand axis bearing of back one-level compression main frame.
9. the series type multi-stage screw compressor that does not have the axle envelope according to claim 8; It is characterized in that; Offer mount inlet (4b) on the sidewall of described flange tube (4); Described mount inlet (4b) is provided with dismountable pressure-bearing cover plate (4c), described pressure-bearing cover plate (4c) and flange tube (4) sealing.
10. the series type multi-stage screw compressor that does not have the axle envelope according to claim 8 is characterized in that described transmission joint part is coupling (8).
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| CN103362813A (en) * | 2013-07-22 | 2013-10-23 | 徐道敏 | Two-stage compression single-screw air compressor and work method thereof |
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| CN114962267A (en) * | 2022-05-31 | 2022-08-30 | 中能建数字科技有限公司 | Compressor for adiabatic compressed air energy storage system with variable pressure ratio |
| CN114962267B (en) * | 2022-05-31 | 2024-05-03 | 吉能国际能源有限公司 | Compressor for heat-insulating compressed air energy storage system with variable pressure ratio |
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| CN108644117A (en) * | 2018-07-25 | 2018-10-12 | 宁波鲍斯能源装备股份有限公司 | A kind of three-level screw drive structure and its helical-lobe compressor |
| CN114962267A (en) * | 2022-05-31 | 2022-08-30 | 中能建数字科技有限公司 | Compressor for adiabatic compressed air energy storage system with variable pressure ratio |
| CN114962267B (en) * | 2022-05-31 | 2024-05-03 | 吉能国际能源有限公司 | Compressor for heat-insulating compressed air energy storage system with variable pressure ratio |
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| CN102705238B (en) | 2014-12-03 |
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