CN208966639U - A kind of centrifugal compressor - Google Patents
A kind of centrifugal compressor Download PDFInfo
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- CN208966639U CN208966639U CN201821344122.2U CN201821344122U CN208966639U CN 208966639 U CN208966639 U CN 208966639U CN 201821344122 U CN201821344122 U CN 201821344122U CN 208966639 U CN208966639 U CN 208966639U
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- gas bearing
- centrifugal compressor
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Abstract
The utility model embodiment provides a kind of centrifugal compressor, including shell, the bearing in the shell, the main shaft being supported on the bearing and the motor being mounted on the main shaft；It is equipped at one end of the main shaft at the other end of the first impeller, the main shaft and the second impeller is installed；First impeller is provided with first entrance and first outlet on the housing, second impeller is provided with second entrance and second outlet on the housing.Axial force caused by the front and back pressure difference of the front and back pressure difference of first impeller and second impeller can be balanced mutually, avoid centrifugal compressor due to axial force it is uneven caused by failure and loss.
Description
Technical field
The utility model relates to field of fluid machinery, more particularly to a kind of centrifugal compressor.
Background technique
Turbo-compressor is a kind of vane type rotating machinery, it utilizes the interaction of blade and working medium, improves working medium
Pressure and kinetic energy, and make flow slowing down using successive flow passage component, kinetic energy be changed into the raising of pressure.
According to working medium move Main way, turbo-compressor can be divided into centrifugal compressor, Axial Flow Compressor,
Axis is wandered about as a refugee heart combined type compressor.Centrifugal compressor, as the term suggests it is exactly that working medium generally makees dynamical pressure radial in compressor
Gas flowing.As one kind of fluid machinery, centrifugal compressor plays a crucial role in pushing economic development, becomes
The indispensable industrial equipment in the fields such as aviation, chemical industry, the energy.
Often there are some shortcoming and defect in utility model people discovery, traditional centrifugal compressor.Such as compressor fortune
Bearing wear is serious when turning.
Summary of the invention
In view of this, the main purpose of the utility model is to provide a kind of centrifugal compressor, it is above-mentioned existing to overcome
The defect of technology.
For this purpose, the utility model adopts the following technical solution:
A kind of centrifugal compressor, including shell, the bearing in the shell, the master being supported on the bearing
Axis and the motor being mounted on the main shaft；The other end of first impeller, the main shaft is installed at one end of the main shaft
Place is equipped with the second impeller；First entrance and first outlet are provided with, described close to first impeller on the housing
Second impeller is provided with second entrance and second outlet on shell.
In some embodiments of the utility model, it is arranged on the main shaft of the motor side in first impeller
There is a upper sealing ring, the upper sealing ring is by the first entrance and first outlet and the motor and bearing that are mounted on the main shaft
Isolation；Lower sealing ring is provided on the main shaft of the motor side in second impeller, the lower sealing ring will be described
Second entrance and second outlet are isolated with the motor and bearing being mounted on the main shaft.
In some embodiments of the utility model, the inner peripheral surface of the upper sealing ring is equipped at least one groove/convex
It rises, at least one described groove/land is matched at least one projections/grooves being arranged on the main shaft；It is close under described
The inner peripheral surface of seal ring is equipped at least one groove/land, at least one described groove/land and is arranged on the main shaft
At least one projections/grooves matches.
In some embodiments of the utility model, it is arranged on the shell of first impeller side in the motor
There is upper through-hole, the top connection being connected to external equipment is installed in the upper through-hole；In the motor close to second impeller
It is provided with lower through-hole on the shell of side, the lower contact being connected to external equipment is installed in the lower through-hole.
In some embodiments of the utility model, the shell includes cylinder, and one end of the cylinder is connected with upper casing
Body, the other end are connected with lower case；The first entrance is arranged in the axial symmetry center position of the upper housing, and described first
Outlet is arranged on the circumference of the upper housing；The axial symmetry center position of the lower case is arranged in the second entrance,
The second outlet is arranged on the circumference of the lower case；The upper through-hole and lower through-hole are arranged on the cylinder.
In some embodiments of the utility model, in the motor close to the shell inner peripheral surface of first impeller side
On be provided with upper bushing, the upper through-hole passes through the upper bushing；In the motor close to the shell of second impeller side
Lower bushing is provided on inner peripheral surface, the lower through-hole passes through the lower bushing.
In some embodiments of the utility model, it is equipped on the main shaft of first impeller side in the motor
First thrust button is equipped with upper dynamic pressure thrust gas bearing and upper dynamic along the direction far from the motor against first thrust button
It presses radial gas bearing provided；The second thrust button is equipped on the main shaft of second impeller side in the motor, against described
Second thrust button is dynamical pressure radial gas bearing provided under equipped with lower dynamic pressure thrust gas bearing along the direction far from the motor.
In some embodiments of the utility model, the upper dynamic pressure thrust gas bearing and first thrust button it
Between contact surface at least one on be provided with molded line conduit, the lower dynamic pressure thrust gas bearing and second thrust button it
Between contact surface at least one on be provided with molded line conduit；It dynamical pressure radial gas bearing provided is contacted between the main shaft described
Molded line conduit is provided at least one of face, the dynamical pressure radial gas bearing provided contact surface between the main shaft is extremely under described
Molded line conduit is provided in few one.
In some embodiments of the utility model, the upper dynamic pressure thrust gas bearing and first thrust button it
Between at least one layer of support foil piece is set, be arranged at least one between the lower dynamic pressure thrust gas bearing and second thrust button
Layer support foil piece；It is described it is it is dynamical pressure radial gas bearing provided at least one layer of support foil piece is provided between the main shaft, in institute
It states down and dynamical pressure radial gas bearing provided is provided at least one layer of support foil piece between the main shaft.
In some embodiments of the utility model, the first vaneless diffuser is installed at the wheel back of first impeller；
The second vaneless diffuser is installed at the wheel back of second impeller.
In each embodiment of the application: the pressure difference before and after the first impeller can generate an axial force, and the direction of the axial force is
The opposite direction of direction of flow by first entrance；Pressure difference before and after second impeller can also generate an axial force, the axial force
Direction be direction of flow by second entrance opposite direction.Since the first impeller and the second impeller are separately mounted to the master
The both ends of axis, therefore the direction of the axial force generated by the front and back pressure difference of the first impeller is generated with by the front and back pressure difference of the second impeller
Axial force it is contrary.In this way, the front and back pressure difference of axial force caused by the front and back pressure difference of the first impeller and the second impeller
Generated axial force can be balanced mutually, avoid centrifugal compressor due to axial force it is uneven caused by failure and
Loss.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of centrifugal compressor provided by the embodiment of the utility model.
Fig. 2 (a) is the structural schematic diagram of upper thrust gas bearing in centrifugal compressor shown in Fig. 1.
Fig. 2 (b) is the structural schematic diagram of dynamic pressure thrust gas paillon in centrifugal compressor shown in Fig. 1.
Fig. 3 (a) is upper radial gas bearing provided and main shaft assembling structure schematic diagram in centrifugal compressor shown in Fig. 1.
Fig. 3 (b) is upper radial gas bearing provided structural schematic diagram in centrifugal compressor shown in Fig. 1.
Fig. 4 is the operation principle schematic diagram of centrifugal compressor shown in Fig. 1.
Specific embodiment
To keep the purpose of this utility model, technical solution and advantage clearer, below in conjunction with attached drawing and specific implementation
Example is described in further detail the utility model.
The utility model embodiment provides a kind of centrifugal compressor.As shown in Figure 1, the centrifugal compressor includes
Shell 1, the bearing 2 in shell 1, the main shaft 14 being supported on bearing 2 and the motor 3 being mounted on main shaft 14.Main shaft
At left end at 14 one end, such as under state shown in Fig. 1, the first impeller 27 is installed.At the other end of main shaft 14,
Such as at the right-hand end under state shown in Fig. 1, the second impeller 30 is installed.It is arranged on shell 1 close to the first impeller 27
There are first entrance 41 and first outlet (not shown), second impeller 30 is provided with second entrance 42 and second on shell 1
It exports (not shown).
Bearing 2 include installation site close to first entrance 41 bearing and installation site close to second entrance 42 bearing,
The two bearing supporting spindles 14, and undertake main shaft 14, the first impeller 27 and the second impeller 30 dynamical pressure radial gas load and
Axial load.The motor 3 installed on main shaft 14 includes the rotor 15 being fixed on main shaft 14 and is set to rotor 15
The motor stator 16 of dynamical pressure radial gas outside.
Motor 3 forms magnetic field between rotor 15 and motor stator 16 after powering on, magnetic fields turn in motor
Son 15 makes rotor 15 that main shaft 14 be driven to rotate, and main shaft 14 drives 27 He of the first impeller being located at first entrance 41 in turn
The second impeller 30 rotation at second entrance 42, so that working medium is involved in first entrance by the first impeller 27 and the second impeller 30 respectively
41 and second entrance 42, two impellers all do work to working medium, increase the pressure of working medium, and pressurized working medium passes through corresponding first
Outlet and second outlet flow out shell 1.
In above process, due to being pressurized by the first impeller 27 and 30 pairs of the second impeller working medium for entering shell 1,
Therefore there is pressure difference in the front and back of the first impeller 27 and the second impeller 30.It is its front, tool on the left of the first impeller 27 in Fig. 1
Pressure before having pressurization, pressure are smaller；It is its rear on the right side of first impeller 27, there is pressurized pressure, pressure is larger.The pressure
Difference can generate axial force to main shaft 14, and the direction of the axial force is the opposite direction of the first direction of flow.Similarly, in Fig. 1, the
It is its front on the right side of two impellers 30, there is the pressure before being pressurized, pressure is smaller；It is its rear on the left of second impeller 30, has and increase
Pressure after pressure, pressure are larger.The pressure difference can generate axial force to main shaft 14, and the direction of the axial force is the second direction of flow
Opposite direction.Wherein, the first direction of flow and the second direction of flow is contrary, so that 27 front and back pressure difference of the first impeller be made to generate
Axial force and the axial force that generates of 30 front and back pressure difference of the second impeller mutually balance, avoid axial force it is uneven caused by therefore
Barrier and loss, such as bearing wear.
There are two the centrifugal compressors of impeller to be properly termed as two-stage centrifugal for this tool provided by the embodiment of the utility model
Formula compressor or two-stage centrifugal type compressor.
In some embodiments of the utility model, it is provided on the main shaft 14 of 3 side of motor in the first impeller 27
Upper sealing ring 21, upper sealing ring 21 by first entrance 41 and first outlet and the motor 3 and bearing 2 that are mounted on main shaft 14 every
From；Lower sealing ring 22 is provided on the main shaft of 3 side of motor in the second impeller 30, and lower sealing ring 22 is by 42 He of second entrance
Second outlet is isolated with the motor and bearing being mounted on main shaft 14.Upper sealing ring 21 and lower sealing ring are set simultaneously on main shaft 14
22, the first impeller 27 and the second impeller 30 can be kept apart, the work for avoiding the first impeller 27 and the second impeller 30 from being pumped
Matter interferes with each other, so that the work of two in two-stage centrifugal compressor impeller is mutually indepedent, it is more smooth.
In order to improve the sealing performance of upper sealing ring 21, it is recessed that at least one can be equipped on the inner peripheral surface of upper sealing ring 21
Slot, at least one groove are matched at least one protrusion being arranged on main shaft 14.Similarly, the inner circumferential of lower sealing ring 22
Face is equipped at least one groove, which matches at least one protrusion being arranged on main shaft 14.Although
One mutually matched groove is set and protrusion also can be improved the sealing performance of upper sealing ring 21 and lower sealing ring 22, but is set
Set multiple grooves and protrusion more preferably.It should be noted that the setting position of above-mentioned groove and protrusion can be interchanged, that is to say, that
Groove also can be set on main shaft 14, and protrusion also can be set on corresponding sealing ring.That is, " groove/land " refers to
Groove or protrusion.Similarly, " projections/grooves " refer to protrusion or groove.
In some embodiments of the utility model, it is provided on the shell 1 of 27 side of the first impeller in motor 3
Through-hole 43 is equipped with the top connection 17 being connected to external equipment in upper through-hole 43；In motor 3 close to the shell of 30 side of the second impeller
It is provided with lower through-hole 44 on body 1, the lower contact 18 being connected to external equipment is installed in lower through-hole 44.By top connection 17 and upper
Through-hole 43 can be to the media such as coolant be supplied inside shell 1, then again by lower contact 18 and lower through-hole 44 by shell 1
The discharge of the media such as internal coolant, can cool down motor 3 in this way, run caused by can preventing motor 3 from overheating
Failure.
In some embodiments of the utility model, shell 1 includes cylinder 11, and one end of cylinder 11 is connected with upper housing
12, the other end is connected with lower case 13.The axial symmetry center position of upper housing 11, first outlet is arranged in first entrance 41
(not shown) is arranged on the circumference of upper housing 11.The axial symmetry center position of lower case 13 is arranged in second entrance 42, the
Two outlets (not shown) are arranged on the circumference of lower case 13.And upper through-hole 43 and lower through-hole 44 are arranged on cylinder 11.That is, the
One entrance 41, first outlet and the first impeller 27 are arranged in upper housing 12；Second entrance 42, second outlet and second
Impeller 30 is arranged in lower case 13.Upper sealing ring 21, bearing 2, motor 3 and lower sealing ring 22 are arranged in cylinder 11, on
Sealing ring 21 opens upper housing 12 and the seal isolation of cylinder 11, lower sealing ring 22 opens lower case 13 and the seal isolation of cylinder 11.
It is thus possible to realize two-stage centrifugal compressor.
In some embodiments of the utility model, set on shell 1 inner peripheral surface of the motor 3 close to 27 side of the first impeller
It is equipped with upper bushing 19, upper through-hole 43 passes through upper bushing 19；It is set on shell 1 inner peripheral surface of the motor 3 close to 30 side of the second impeller
It is equipped with lower bushing 20, lower through-hole 44 passes through lower bushing 20.In the condition shown in figure 1, the left side of motor stator 16 and upper bushing
19 match, and the right side of motor stator 16 is matched with lower bushing 20.It can make main shaft 14 by upper bushing 19 and lower bushing 20
Each components position of upper installation is securely compact.
In some embodiments of the utility model, the is equipped on the main shaft 14 of 27 side of the first impeller in motor 3
One thrust button 45 is equipped with upper dynamic pressure thrust gas bearing 25 and upper dynamic pressure along the direction far from motor 3 against the first thrust button 45
Radial gas bearing provided 23；It is equipped with the second thrust button 46 on the main shaft 14 of 30 side of the second impeller in motor 3, stops against second
Push-plate 46 is equipped with lower dynamic pressure thrust gas bearing 26 dynamical pressure radial gas bearing provided 24 under along the direction far from motor 3.Wherein,
The shaft shoulder, sleeve or washer can be used also to replace in one thrust button 45 and the second thrust button 46.In Fig. 1, the first thrust button 45
The shaft shoulder is embodied as with the second thrust button 46.In the condition shown in figure 1, the right side of upper sealing ring 21 is equipped with dynamical pressure radial gas
Body bearing 23, upper dynamical pressure radial gas bearing provided 23 right side are matched with upper dynamic pressure thrust gas bearing 25；Lower sealing ring 22
Left side is equipped with down dynamical pressure radial gas bearing provided 24, under dynamical pressure radial gas bearing provided 24 left side and lower dynamic pressure thrust gas bearing
26 match.After dynamical pressure radial gas bearing provided and dynamic pressure thrust gas bearing, since the coefficient of friction of hydrodynamic gas-lubricated bearing is extremely low,
Therefore centrifugal compressor can achieve very high revolving speed.The range of speeds of conventional centrifugal compressor is thousands of to one per minute
Ten thousand turn left right range, and the revolving speed of centrifugal compressor provided by the embodiment of the utility model up to 50,000 turns per minute or
It is higher.Therefore, under same mass flow, the volume and weight of centrifugal compressor provided by the embodiment of the utility model can be shown
It writes and reduces, be the one third of conventional centrifugal compressor volume and weight to a quarter.
As shown in Fig. 2 (a) and 2 (b), in the contact surface that upper dynamic pressure thrust gas bearing 25 is in contact with the first thrust button 45
On be provided with molded line conduit 53.Alternatively, can also be connect in the first thrust button 45 with what upper dynamic pressure thrust gas bearing 25 was in contact
Molded line conduit is provided in contacting surface.Alternatively, being respectively provided with molded line conduit on contact surface between.Similarly, in lower dynamic pressure
Molded line conduit is provided at least one of contact surface between thrust gas bearing 26 and the second thrust button 46.
As shown in Fig. 3 (a) and 3 (b), it is arranged on the contact surface that upper dynamical pressure radial gas bearing provided 23 are in contact with main shaft 14
There is molded line conduit 51.Alternatively, can also be provided on the contact surface that main shaft 14 is in contact with upper dynamical pressure radial gas bearing provided 23
Molded line conduit.Alternatively, being provided with molded line conduit on contact surface between.Similarly, in lower dynamical pressure radial gas axis
It holds and is provided with molded line conduit at least one of contact surface between 24 and main shaft 14.
With continued reference to shown in Fig. 2 (a) and 2 (b), it is arranged between upper dynamic pressure thrust gas bearing 25 and the first thrust button 45
There is dynamic pressure thrust gas paillon 50；Similarly, can be arranged between lower dynamic pressure thrust gas bearing 26 and the second thrust button 46
There is dynamic pressure thrust gas paillon.
With continued reference to shown in Fig. 3 (a) and 3 (b), dynamic pressure is provided between upper dynamical pressure radial gas bearing provided 23 and main shaft 14
Radial gas paillon 52；Similarly, dynamical pressure radial gas can be provided between dynamical pressure radial gas bearing provided 24 and main shaft 14 under
Body paillon.
In the course of work of centrifugal compressor, between upper dynamic pressure thrust gas bearing 25 and the first thrust button 45, with
And dynamic pressure thrust gas friction pair, upper dynamical pressure radial gas are formed between lower dynamic pressure thrust gas bearing 26 and the second thrust button 46
Between bearing 23 and main shaft 14 and under between dynamical pressure radial gas bearing provided 24 and main shaft 14 formed dynamical pressure radial gas friction
It is secondary.When main shaft 14 rotates, into the medium in cylinder 11 can flow through gap between dynamic pressure thrust gas bearing and thrust button,
And the dynamical pressure radial gas bearing provided gap between main shaft, the relative motion of dynamic pressure thrust gas bearing and thrust button and
It is dynamical pressure radial gas bearing provided to generate dynamic pressure effect with main shaft relative motion, i.e., due to the viscous effect of medium, stop in dynamic pressure
It pushes away between gas bearing and thrust button and generates liquid film between main shaft dynamical pressure radial gas bearing provided, liquid film has high pressure
To have good bearing capacity, dynamic pressure thrust gas bearing and the dynamical pressure radial gas bearing provided effect for reaching self-lubricating can be made
Fruit.
When using kinetic pressure gas paillon, each hydrodynamic gas-lubricated bearing is formed as flexible foil structure.When being machined with molded line slot
When road, each hydrodynamic gas-lubricated bearing is formed as rigid structure.No matter it is flexible foil configuration and is also rigid molded line channel structure,
Between dynamic pressure thrust gas bearing and thrust button and the dynamical pressure radial gas bearing provided medium between main shaft all can be along paillon
Or molded line conduit is to central compression, so that making the liquid film of above-mentioned generation has high pressure.
In the structure of the centrifugal compressor, bearing 2 is arranged inside shell 1, and utilizes the medium entered in shell 1
It is lubricated, not the participation of lubricating oil.Compared with conventional lubrication oil lubrication, it can not only prevent refrigerant and dissolving each other for lubricating oil from leading
Cause the deterioration of lubricating status, moreover it is possible to prevent the loss of lubricating oil and reduce heat transfer effect of the refrigerant in heat-exchange apparatus.
It continues to refer to figure 1, in order to increase the supercharging effect of centrifugal compressor, is equipped at the wheel back of the first impeller 27
First vaneless diffuser 28 is equipped with the second vaneless diffuser 31 at the wheel back of the second impeller 30.
It continues to refer to figure 1, is provided with entry guide vane 29 at the first entrance 41 of upper housing 12.Using rotatable import
Guide vane 29 can make the adjustable range of working medium flow broaden, therefore operating condition wide coverage, good economy performance.Although it is not shown, can
With understanding, entry guide vane can also be set at the second entrance 42 of lower case 13.
In order to illustrate the working principle of the utility model embodiment centrifugal compressor, it is intermediate completely that level-one throttling is used only
Its principle is illustrated for cooling two stages of compression circulation.The utility model embodiment is not limited thereto circulation, can also be with
Apply the two stages of compression circulation in various other types.Referring to Fig. 4, the work of the utility model embodiment centrifugal compressor is former
Reason are as follows:
Centrifugal compressor 100 provided by the embodiment of the utility model powers on, and working medium first flows through first order compression
The first entrance 41 and entry guide vane 29 of 12 center of upper housing of machine 101 enter the internal cavities of upper housing 12.The first order
The gas working medium workmanship of 101 pairs of compressor suckings, increases the pressure of gas working medium.Pressurized gas working medium passes through upper housing 12
Flow out first order compressor 101 in the outlet of circumferencial direction.In the course of work of first order compressor 101, with 14 turns of main shaft
Speed step up, upper dynamical pressure radial gas bearing provided 23 and under dynamical pressure radial gas bearing provided 24 respectively with main shaft 14 formation air film,
Lubrication form becomes gas lubrication.Similarly, upper dynamic pressure thrust gas bearing 25 and lower dynamic pressure thrust gas bearing 26 are also distinguished
Air film is formed with thrust button 45,46, lubrication form becomes gas lubrication.
Then, it is cooled to liquid completely after the high temperature and high pressure gas of overcompression flows into intercooler 104.In at this point,
Between in cooler 104 the corresponding saturation gaseous refrigerant of saturation pressure by entering after the upper outlet outflow of intercooler 104
High stage compressor 102.It is cold that high temperature and high pressure gaseous refrigerant after the pressurization of high stage compressor 102 flows through two-stage compression cycle
Condenser 103 cools as liquid condition, and the refrigerant then flowed out is divided into two-way.After refrigerant flows through throttle valve 105 all the way
Into intercooler 104, the temperature in cooler is reduced.After another way refrigerant firstly flows through the cooling of intercooler 104, then
Stream such as 107 evaporation endothermic of two-stage compression cycle evaporator generates cooling capacity, and subsequent refrigerant is by connecing under on centrifugal compressor 100
First 18 enter cylinder 11, are flowed out after the motor 3 in cooling cylinder 11 by top connection 17.Flow subsequently through two-stage compression cycle gas-liquid point
Next circulation is carried out from the entrance for being finally returned to first order compressor 101 after device 108.
In conclusion the above is only the preferred embodiments of the present utility model only, it is not intended to limit the utility model
Protection scope.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all wrap
Containing being within the protection scope of the utility model.
Claims (10)
1. a kind of centrifugal compressor, which is characterized in that including shell, the bearing in the shell, be supported on the axis
The main shaft held and the motor being mounted on the main shaft；
It is equipped at one end of the main shaft at the other end of the first impeller, the main shaft and the second impeller is installed；In the shell
First entrance and first outlet are provided with, on the housing close to second impeller setting close to first impeller on body
There are second entrance and second outlet.
2. centrifugal compressor according to claim 1, which is characterized in that
Upper sealing ring is provided on the main shaft of the motor side in first impeller, and the upper sealing ring is by described
One entrance and first outlet are isolated with the motor and bearing being mounted on the main shaft；
Lower sealing ring is provided on the main shaft of the motor side in second impeller, and the lower sealing ring is by described
Two entrances and second outlet are isolated with the motor and bearing being mounted on the main shaft.
3. centrifugal compressor according to claim 2, which is characterized in that
The inner peripheral surface of the upper sealing ring is equipped at least one groove/land, at least one described groove/land and setting exist
At least one projections/grooves on the main shaft match；
The inner peripheral surface of the lower sealing ring is equipped at least one groove/land, at least one described groove/land and setting exist
At least one projections/grooves on the main shaft match.
4. centrifugal compressor according to claim 1, which is characterized in that
Upper through-hole is provided on the shell of first impeller side in the motor, be equipped in the upper through-hole with outside
The top connection of portion's equipment connection；
Lower through-hole is provided on the shell of second impeller side in the motor, be equipped in the lower through-hole with outside
The lower contact of portion's equipment connection.
5. centrifugal compressor according to claim 4, which is characterized in that the shell includes cylinder, the cylinder
One end is connected with upper housing, the other end is connected with lower case；
The axial symmetry center position of the upper housing is arranged in the first entrance, and the first outlet is arranged in the upper casing
On the circumference of body；
The axial symmetry center position of the lower case is arranged in the second entrance, and the second outlet is arranged in the lower casing
On the circumference of body；
The upper through-hole and lower through-hole are arranged on the cylinder.
6. centrifugal compressor according to claim 5, which is characterized in that
Upper bushing is provided on the shell inner peripheral surface of first impeller side in the motor, the upper through-hole passes through institute
State upper bushing；
Lower bushing is provided on the shell inner peripheral surface of second impeller side in the motor, the lower through-hole passes through institute
State lower bushing.
7. centrifugal compressor according to claim 1, which is characterized in that
The first thrust button is equipped on the main shaft of first impeller side in the motor, against first thrust button edge
Direction far from the motor is equipped with upper dynamic pressure thrust gas bearing and upper dynamical pressure radial gas bearing provided；
The second thrust button is equipped on the main shaft of second impeller side in the motor, against second thrust button edge
It is dynamical pressure radial gas bearing provided under that direction far from the motor is equipped with lower dynamic pressure thrust gas bearing.
8. centrifugal compressor according to claim 7, which is characterized in that
Molded line is provided at least one of contact surface between the upper dynamic pressure thrust gas bearing and first thrust button
Conduit is provided with molded line at least one of contact surface between the lower dynamic pressure thrust gas bearing and second thrust button
Conduit；
It is provided with molded line conduit at least one of the upper dynamical pressure radial gas bearing provided contact surface between the main shaft,
Molded line conduit is provided at least one of the dynamical pressure radial gas bearing provided contact surface between the main shaft under described.
9. centrifugal compressor according to claim 7, which is characterized in that
At least one layer of support foil piece is set between the upper dynamic pressure thrust gas bearing and first thrust button, under described
At least one layer of support foil piece is set between dynamic pressure thrust gas bearing and second thrust button；
It is described it is it is dynamical pressure radial gas bearing provided at least one layer of support foil piece is provided between the main shaft, in the lower dynamic pressure
It is radial gas bearing provided that at least one layer of support foil piece is provided between the main shaft.
10. centrifugal compressor according to claim 1, which is characterized in that
The first vaneless diffuser is installed at the wheel back of first impeller；
The second vaneless diffuser is installed at the wheel back of second impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821344122.2U CN208966639U (en) | 2018-08-12 | 2018-08-12 | A kind of centrifugal compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821344122.2U CN208966639U (en) | 2018-08-12 | 2018-08-12 | A kind of centrifugal compressor |
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| Publication Number | Publication Date |
|---|---|
| CN208966639U true CN208966639U (en) | 2019-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821344122.2U Active CN208966639U (en) | 2018-08-12 | 2018-08-12 | A kind of centrifugal compressor |
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| Country | Link |
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| CN (1) | CN208966639U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111608930A (en) * | 2020-05-20 | 2020-09-01 | 无锡职业技术学院 | Gas bearing and gas bearing type centrifugal compressor |
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2018
- 2018-08-12 CN CN201821344122.2U patent/CN208966639U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111608930A (en) * | 2020-05-20 | 2020-09-01 | 无锡职业技术学院 | Gas bearing and gas bearing type centrifugal compressor |
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