CN111120312B - Screw compressor design method and screw compressor - Google Patents
Screw compressor design method and screw compressor Download PDFInfo
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- CN111120312B CN111120312B CN201911284878.1A CN201911284878A CN111120312B CN 111120312 B CN111120312 B CN 111120312B CN 201911284878 A CN201911284878 A CN 201911284878A CN 111120312 B CN111120312 B CN 111120312B
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- screw compressor
- auxiliary support
- gas force
- support structure
- compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0021—Systems for the equilibration of forces acting on the pump
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The application provides a screw compressor and a design method thereof. S10, carrying out stress analysis on a rotor to obtain the direction of a gas force; and S20, arranging a supporting structure connected with the bearing seat on the shell according to the direction of the gas force, wherein the stress direction of the supporting structure is consistent with the direction of the gas force born by the bearing seat. By applying the technical scheme of the invention, the transmission of the periodical gas force of the compressor to the outside can be reduced or blocked by arranging the supporting structure which is consistent with the direction of the gas force born by the bearing seat on the bearing seat, the periodical fatigue damage of parts connected with the compressor can be reduced, the running reliability of the screw compressor unit is improved, and the service life of the unit is prolonged.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a design method of a screw compressor and the screw compressor.
Background
The screw compressor is one kind of positive displacement compressor, and its working principle is that a pair of meshed and parallel male and female rotors form closed volume, and the motor drives the rotors to reduce the closed volume continuously with the rotation of the rotors, so that the gas is raised from low temperature and low pressure to high temperature and high pressure and the process of compressing gas is realized. During this time, the screw compressor performs an energy conversion from electrical energy to mechanical energy to thermal energy.
As shown in fig. 1, a motor 1 drives a male rotor 2 to rotate and match a female rotor 3 to compress gas, the volume of the screw compressor is gradually reduced from left to right, and in the process of transmitting energy to compress the gas, a gas force for exciting vibration of parts of the compressor can be generated, and the gas force is transmitted to the outside through bearings arranged at two ends of the rotor. As shown in fig. 2, since the suction and the discharge of the screw compressor are periodical processes, the gas force of the screw compressor also shows periodical changes correspondingly. When the parts are in the force transmission process, if weak positions exist or the natural frequencies of the orders of the self structure and the excitation frequency of the gas force are in the resonance range, the phenomenon that the parts are invalid due to the aggravation of vibration can occur, and then the compressor cannot work normally. The compressor vibration has a very important influence on the performance and reliability of its operation.
Disclosure of Invention
The embodiment of the invention provides a design method of a screw compressor and the screw compressor, which are used for solving the technical problem that vibration generated by excitation of gas force is not well dealt with in the screw compressor in the prior art.
The embodiment of the application provides a design method of a screw compressor, which comprises the following steps: s10, carrying out stress analysis on the rotor to obtain the direction of the gas force; and S20, arranging a supporting structure connected with the bearing seat on the shell according to the direction of the gas force, wherein the stress direction of the supporting structure is consistent with the direction of the gas force born by the bearing seat.
In one embodiment, the design method further comprises: and S30, arranging a machine foot structure on the shell according to the stress direction of the supporting structure, wherein the machine foot structure is positioned in the stress direction of the supporting structure.
In one embodiment, in step S30, further includes: the machine leg structure is provided with a reinforcing rib.
In one embodiment, the design method further comprises: and S40, carrying out harmonic response calculation on the screw compressor to obtain vibration intensity of the machine foot structure, and designing structural parameters of the machine foot structure and/or the reinforcing ribs according to the vibration intensity.
In one embodiment, in step S10, further includes: when the rotor is subjected to stress analysis, the size of the gas force is also obtained; the step S20 further includes: and designing structural parameters of the supporting structure according to the magnitude of the gas force.
The present application also provides a screw compressor comprising: the device comprises a shell and a screw, wherein the shell is provided with a bearing seat, the screw is arranged on the bearing seat, the shell is also provided with a supporting structure connected with the bearing seat, and the direction of the gas force generated by the screw borne by the bearing seat is consistent with that of the gas force generated by the screw borne by the bearing seat.
In one embodiment, the housing is further provided with at least one auxiliary support structure connected to the bearing housing.
In one embodiment, the auxiliary support structure comprises a lateral auxiliary support structure and a diagonal auxiliary support structure, the lateral auxiliary support structure being disposed horizontally and the diagonal auxiliary support structure being disposed obliquely with respect to the horizontal plane.
In one embodiment, the auxiliary support structure comprises a longitudinal auxiliary support structure, the longitudinal auxiliary support structure being arranged in a vertical direction.
In one embodiment, the bottom of the housing is further provided with a tripod structure, which is located in the stress direction of the support structure.
In one embodiment, the stand structure is provided with reinforcing ribs.
In one embodiment, the stand-off structure integrally extends in the axial direction of the housing at the bottom of the housing.
In the embodiment, the supporting structure which is consistent with the direction of the gas force born by the bearing seat is arranged on the bearing seat, so that the transmission of the periodical gas force of the compressor to the outside can be reduced or blocked, the periodical fatigue damage of parts connected with the compressor can be reduced, the running reliability of the screw compressor unit is improved, and the service life of the unit is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic view of the structural principle of a screw compressor according to the prior art;
FIG. 2 is a schematic view of the rotor gas force of the screw compressor of FIG. 1 as a function of angle;
FIG. 3 is a flow schematic of a method of designing a screw compressor according to the present invention;
FIG. 4 is a schematic cross-sectional structural view of a screw compressor according to the present invention;
FIG. 5 is a schematic side view of the screw compressor of FIG. 4;
fig. 6 is a schematic top view of the leg structure of the screw compressor of fig. 4.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. The exemplary embodiments of the present invention and the descriptions thereof are used herein to explain the present invention, but are not intended to limit the invention.
In the working process of the compressor, the male rotor and the female rotor form a closed tooth groove, the volume of the tooth groove is continuously smaller, compressed gas is realized, meanwhile, the bearing bears gas force, and the gas force is transmitted to the outside through the bearing. The vibration (output) of the compressor structure is equal to the gas force (excitation source) times the frequency response function of the structure itself, which would create serious vibration problems if the frequency response function had just a peak at the excitation frequency. Wherein the gas force excitation frequency of the compressor is the meshing frequency of the rotor, namely the rotating speed of the male rotor per second is multiplied by the number of teeth of the male rotor; the frequency response function of the self structure is the structural characteristic of the compressor, and the main parameter is a modal parameter; in order to achieve the purpose of vibration reduction, according to the model of 'source-path-receiver', blocking the transmission path of the source and the receiver by modifying the structural characteristics of the compressor is an effective method.
Specifically, as shown in fig. 3, in the technical scheme of the invention, the design method of the screw compressor comprises the following steps of S10, carrying out stress analysis on a rotor to obtain the direction of gas force; and S20, arranging a supporting structure 12 connected with the bearing seat 11 on the shell 10 according to the direction of the gas force, wherein the stressed direction of the supporting structure 12 is consistent with the direction of the gas force borne by the bearing seat 11.
By applying the technical scheme of the invention, the support structure 12 which is consistent with the direction of the gas force born by the bearing seat 11 is arranged on the bearing seat 11, so that the transmission of the periodical gas force of the compressor to the outside can be reduced or blocked, the periodical fatigue damage of parts connected with the compressor can be reduced, the running reliability of the screw compressor unit is improved, and the service life of the unit is prolonged.
More preferably, the design method further comprises: and S30, arranging a machine foot structure 14 on the shell 10 according to the stress direction of the supporting structure 12, wherein the machine foot structure 14 is positioned in the stress direction of the supporting structure 12, so that the machine foot structure 14 can also bear gas force, further reduce or block the transmission of the periodic gas force of the compressor to the outside, and reduce the periodic fatigue damage of parts connected with the compressor.
More preferably, in the technical solution of this embodiment, step S30 further includes: the stiffener 141 is provided on the leg structure 14. The stiffener 141 can strengthen the leg structure 14 and improve the life of components connected to the compressor.
As shown in fig. 3, in the technical solution of this embodiment, the design method further includes: and S40, carrying out harmonic response calculation on the screw compressor to obtain the vibration intensity of the position of the machine foot structure 14, and designing structural parameters of the machine foot structure 14 and/or the reinforcing ribs 141 according to the vibration intensity. After the vibration intensity of the leg structure 14 is obtained, the structural parameters of the leg structure 14 and/or the reinforcing ribs 141 are designed to be co-designed integrally with the compressor, so that the structural parameters of the leg structure 14 and/or the reinforcing ribs 141 need to be adjusted in a targeted manner according to the actual vibration intensity feedback. Specifically, the mechanical vibration of the positive displacement compressor can be measured and evaluated according to national standard GB-T7777-2003, and the vibration intensity is generally evaluated to be not more than 7.1mm/s. Therefore, the structural characteristics of the compressor can be changed, resonance between the compressor and an excitation source is effectively avoided, and the transmission of vibration of the compressor is blocked.
More preferably, in step S10, the method further comprises: when the rotor is subjected to stress analysis, the size of the gas force is also obtained; the step S20 further includes: depending on the magnitude of the gas force, the structural parameters of support structure 12 are designed. In this way, the structural parameters of the supporting structure 12 can be set appropriately according to the magnitude of the gas force, so that the structural parameters of the supporting structure 12 meet the stress requirement, and the transmission of the periodic gas force of the compressor to the outside is effectively reduced or blocked.
As shown in fig. 4, the present invention also provides a screw compressor including a housing 10 and a screw, the housing 10 being provided with a bearing housing 11, the screw being mounted on the bearing housing 11. The shell 10 is also provided with a supporting structure 12 connected with the bearing seat 11, and the direction of the gas force generated by the screw rod borne by the bearing seat 11 is consistent with that of the supporting structure 12, so that the transmission of the periodical gas force of the compressor to the outside can be reduced or blocked, the periodical fatigue damage of parts connected with the compressor can be reduced, the running reliability of the screw compressor unit is improved, and the service life of the unit is prolonged.
More preferably, as shown in fig. 4, the housing 10 is further provided with at least one auxiliary support structure 13 connected to the bearing housing 11. The auxiliary support structure 13 may serve as an auxiliary support for the bearing housing 11, thereby improving the shock absorbing effect for the bearing housing 11. Optionally, in the technical solution of the present embodiment, the auxiliary supporting structure 13 includes a lateral auxiliary supporting structure 131 and an oblique auxiliary supporting structure 132, where the lateral auxiliary supporting structure 131 is horizontally disposed, and the oblique auxiliary supporting structure 132 is obliquely disposed with respect to the horizontal plane. More preferably, the auxiliary support structure 13 further comprises a longitudinal auxiliary support structure 133, the longitudinal auxiliary support structure 133 being arranged in a vertical direction. In this way, a more complete support of the bearing 11 can be achieved.
As shown in fig. 5, the bottom of the casing 10 is further provided with a tripod structure 14, and the tripod structure 14 is located in the stress direction of the supporting structure 12, so that the tripod structure 14 can also receive gas force, further reduce or block the transmission of the periodic gas force of the compressor to the outside, and reduce the periodic fatigue damage of parts connected with the compressor. More preferably, the strengthening ribs 141 are arranged on the machine leg structure 14, and the shock transmission of the compressor can be reduced through the strengthening ribs 141, so that the rigidity of the compressor is increased.
As shown in fig. 6, as a more preferable embodiment, the tripod structure 14 integrally extends in the axial direction of the casing 10 at the bottom of the casing 10. Thus, the connection effect with the fixing surface can be enhanced by arranging the leg structure 14 in an integrated form. Specifically, the left end and the right end of the machine leg structure 14 are connected together, which is favorable for increasing the number of machine leg bolts, preventing the machine leg from vibrating and increasing due to individual loosening of the bolts, and the integral rigidity of the compressor can be enhanced by a plurality of constraints. Meanwhile, the machine leg structure 14 is connected with the machine body by local reinforcing ribs 141, so that the rigidity of the compressor is further enhanced, and a better vibration reduction effect can be obtained.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations can be made to the embodiments of the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method of designing a screw compressor, the method comprising:
s10, carrying out stress analysis on the rotor to obtain the direction of the gas force;
s20, arranging a supporting structure (12) connected with a bearing seat (11) on the shell (10) according to the direction of the gas force, wherein the stress direction of the supporting structure (12) is consistent with the direction of the gas force born by the bearing seat (11);
s30, arranging a machine foot structure (14) on the shell (10) according to the stress direction of the supporting structure (12), wherein the machine foot structure (14) is positioned in the stress direction of the supporting structure (12), and reinforcing ribs (141) are arranged on the machine foot structure (14);
and S40, carrying out harmonic response calculation on the screw compressor to obtain the vibration intensity of the machine foot structure (14), and designing structural parameters of the machine foot structure (14) and/or the reinforcing ribs (141) according to the vibration intensity.
2. The method of designing a screw compressor according to claim 1, further comprising, in step S10: when the rotor is subjected to stress analysis, the size of the gas force is also obtained;
the step S20 further includes: structural parameters of the support structure (12) are designed according to the magnitude of the gas force.
3. A screw compressor, comprising: casing (10) and screw rod, be provided with bearing frame (11) on casing (10), the screw rod is installed on bearing frame (11), its characterized in that, still be provided with on casing (10) with bearing frame (11) continuous bearing structure (12), bearing structure (12) with the bearing frame (11) bear the direction of the gaseous force that the screw rod produced is consistent, the bottom of casing (10) still is provided with tripod structure (14), tripod structure (14) are located in the atress direction of bearing structure (12), set up strengthening rib (141) on tripod structure (14).
4. A screw compressor according to claim 3, wherein the housing (10) is further provided with at least one auxiliary support structure (13) connected to the bearing housing (11).
5. Screw compressor according to claim 4, wherein the auxiliary support structure (13) comprises a transversal auxiliary support structure (131) and a diagonal auxiliary support structure (132), the transversal auxiliary support structure (131) being arranged horizontally and the diagonal auxiliary support structure (132) being arranged inclined with respect to the horizontal plane.
6. Screw compressor according to claim 5, wherein the auxiliary support structure (13) comprises a longitudinal auxiliary support structure (133), the longitudinal auxiliary support structure (133) being arranged in a vertical direction.
7. A screw compressor according to claim 3, wherein the leg structure (14) extends integrally in the axial direction of the housing (10) at the bottom of the housing (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911284878.1A CN111120312B (en) | 2019-12-13 | 2019-12-13 | Screw compressor design method and screw compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911284878.1A CN111120312B (en) | 2019-12-13 | 2019-12-13 | Screw compressor design method and screw compressor |
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| Publication Number | Publication Date |
|---|---|
| CN111120312A CN111120312A (en) | 2020-05-08 |
| CN111120312B true CN111120312B (en) | 2023-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911284878.1A Active CN111120312B (en) | 2019-12-13 | 2019-12-13 | Screw compressor design method and screw compressor |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4142765A (en) * | 1977-02-10 | 1979-03-06 | Sullair Corporation | Rotor bearing assembly for rotary gas machine |
| JP2006200363A (en) * | 2005-01-18 | 2006-08-03 | Fujitsu General Ltd | Hermetic compressor |
| CN102549267B (en) * | 2009-09-25 | 2014-12-10 | 东芝开利株式会社 | Hermetically sealed compressor and refrigeration cycle device employing the same |
| CN207795876U (en) * | 2017-09-20 | 2018-08-31 | 大连派思透平动力科技有限公司 | A kind of elastic shaft bearing |
| CN108561197A (en) * | 2017-12-22 | 2018-09-21 | 东方电气集团东方汽轮机有限公司 | Turbomachine Rotor support construction |
| CN109002619A (en) * | 2018-07-25 | 2018-12-14 | 四川长虹空调有限公司 | The simulation optimization method of air-conditioner with fixed frequency compressor piping vibration |
| CN209340198U (en) * | 2018-12-25 | 2019-09-03 | 珠海格力电器股份有限公司 | Bearing support assemblies and centrifugal compressor |
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2019
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