CN215719595U - Centrifugal compressor - Google Patents
Centrifugal compressor Download PDFInfo
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- CN215719595U CN215719595U CN202122013838.2U CN202122013838U CN215719595U CN 215719595 U CN215719595 U CN 215719595U CN 202122013838 U CN202122013838 U CN 202122013838U CN 215719595 U CN215719595 U CN 215719595U
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Abstract
The utility model discloses a centrifugal compressor, which comprises a first-stage impeller, wherein the first-stage impeller is arranged at an air inlet of a diffuser, the diffuser is communicated with a reflux device through an air supply channel, the air supply channel comprises a diffusion channel, a reversing channel and a reflux channel, a cooling coil is arranged on the reflux channel, and an air outlet of the reflux device is provided with an air supplementing port. The utility model has the advantages that: the cooling coil cools the gas in the backflow channel, so that the difference between the air pressure in the backflow channel and the air pressure in the diffusion channel is increased, the airflow can smoothly pass through the reversing channel, the primary compression is close to isothermal compression as much as possible, and the energy consumption of the next stage of compression is saved; an air supplementing port is arranged at an air outlet of the reflux device, and the air quantity entering the secondary impeller for compression is ensured to be sufficient in an air supplementing mode, so that the process requirements of users are met.
Description
Technical Field
The utility model relates to the technical field of compressors, in particular to a centrifugal compressor.
Background
A compressor is a driven fluid machine that delivers and raises the pressure of a gas. Centrifugal compressors, also called "turbo compressors", are one type of compressor that is widely used in various processes to deliver air, various process gases or mixtures and to increase the pressure thereof.
In the actual operation of the compressor unit, gas is continuously sucked into the compressor through the impeller to compress the gas, but the first-stage impeller in the compressor is led out to the inlet of the second-stage impeller, 180-degree curve reversing is needed, the gas with larger curve angle is easy to separate at the rear half section of the curve, so that the pneumatic loss caused by the separation is caused, and the subsequent air compression efficiency is influenced. In addition, a large amount of heat can be generated in the compression process of the gas by the first-stage impeller, so that the temperature of the gas is increased, the high-temperature gas is not beneficial to the subsequent compression process, and the subsequent air compression efficiency can be influenced. In addition, the flow of air depends on the pressure difference, i.e. the gas flows from a high pressure to a low pressure, and the higher the pressure difference, the faster and smoother the gas flow. The pressure difference between the air passage at the front end and the air passage at the rear end of the curve is usually small, which is also one of the reasons for the gas separation backflow in the latter half of the curve.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the technical defects in the prior art and disclose a centrifugal compressor.
In order to realize the purpose of the utility model, the technical scheme adopted by the utility model is as follows:
a centrifugal compressor comprises a diffuser, wherein a first-stage impeller is installed at an air inlet of the diffuser, and the diffuser is communicated with a reflux device through an air supply channel; the air supply passage includes diffusion passageway, switching-over passageway and backward flow passageway, diffusion passageway intercommunication diffuser air intake, the switching-over passageway sets up between diffusion passageway and backward flow passageway, inside the diffusion passageway is in the diffuser, the inside a plurality of backward flow ware blades that are provided with of backward flow ware, the backward flow passageway sets up between the backward flow ware blade, its characterized in that: the backflow device is communicated with an air inlet which is communicated with an air supplementing port, and the air supplementing port is arranged at the rear end of an air outlet of the backflow device; and a cooling channel is arranged on the inner wall of the backflow channel and is communicated with an inlet end and an outlet end.
Furthermore, a spherical buffer cavity is arranged between the air inlet and the return device blade channel.
Further, the cooling medium inside the cooling channel is a compressor refrigerant or water.
Further, the cross-sectional shape of the cooling channel is circular, semicircular or rectangular.
Further, the cooling channel is a cooling coil.
Furthermore, the air outlet of the reflux device is connected with a secondary impeller.
Compared with the prior art, the utility model has the advantages that:
the cooling coil is arranged on the inner wall of the backflow channel, and the gas after primary compression is cooled and depressurized, so that the difference between the air pressure in the backflow channel and the air pressure in the diffusion channel is increased, the gas can smoothly pass through the reversing channel, and the gas separation caused by backflow of the gas is reduced; an air supplementing port is arranged at an air outlet of the reflux device, so that sufficient air can enter the secondary impeller to be compressed even if a small part of air is separated through the reversing channel.
Drawings
FIG. 1 is a schematic view of a centrifugal compressor;
wherein: 1. the device comprises a first-stage impeller, a second-stage impeller, a first-stage diffuser, a second-stage, a cooling channel, a second-stage 41, an inlet end 42, an outlet end 51, an air inlet, and an air supply channel 52, an air supply port, and a second-supply port 8.
Detailed Description
The utility model is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Example 1
A centrifugal compressor comprises a diffuser 2, wherein a first-stage impeller 1 is installed at an air inlet of the diffuser 2, and the diffuser 2 is communicated with a reflux device 3 through an air supply channel 7; air supply channel 7 includes diffusion passageway 21, switching-over passageway 6 and backflow passage 32, and diffusion passageway 21 communicates the 2 air intakes of diffuser, and switching-over passageway 6 sets up between diffusion passageway 21 and backflow passage 32, diffusion passageway 21 is in inside diffuser 2, and backflow ware 3 is inside to be provided with a plurality of backflow ware blades 31, backflow passage 32 sets up between backflow ware blade 31, and it has air inlet 51 to take shape on the backflow ware 3, and air inlet 51 intercommunication has tonifying mouth 52, and tonifying mouth 52 is installed and is provided with globular cushion chamber 53 between backflow ware 3 gas outlet rear end air inlet 51 and backflow ware blade passageway 311.
The cooling channel 4 is installed on the inner wall of the return channel 32, and the cooling channel 4 is communicated with an inlet end 41 and an outlet end 42. The cooling medium in the cooling channel 4 is a compressor refrigerant or water. The cross-sectional shape of the cooling channel 4 is circular, semicircular or rectangular. The cooling channel 4 is a cooling coil.
The air outlet of the reflux device 3 is connected with a secondary impeller 8.
The using method comprises the following steps:
because gas is by high pressure position to low pressure position circulation, the bigger pressure difference is more smooth and more smooth, the cooling coil who sets up on backflow channel 32 inner wall cools down the step-down to the gas after advancing first compression, increase the pressure difference between backflow channel 32 and diffusion passageway 21, make the air current can be more smooth and more smooth get into backflow channel 32 through commutating channel 6 by diffusion passageway 21, the gas that has alleviateed like this when passing through commutating channel 6, take place the backward flow in commutating channel 6 latter half, cause gas separation, and the compression of gas is close to isothermal compression after the cooling, the compression energy consumption of next stage has been saved, the compression efficiency of second grade impeller has been promoted.
Be provided with the tonifying qi mouth 53 at the backward flow ware 3 air outlet, tonifying qi mouth 53 intercommunication air inlet 51, be provided with the cushion chamber in tonifying qi mouth 53 and the air inlet 51, let in the gas that is unanimous with the gas of compressed in the compressor in air inlet 51, wherein globular cushion chamber 53 can increase the gas contact space, the realization pressure that can be better makes inside gas faster is even, prevent that the too big gaseous backward flow that leads to of backward flow ware 3 gas outlet atmospheric pressure, gas blows off via tonifying qi mouth 53 after passing through air inlet 51 cushion chamber 53, make even still that there is a small part of gas still sufficient gas can get into secondary impeller 8 and compress after the separation through switching-over passageway 6.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A centrifugal compressor comprises a diffuser (2), wherein a first-stage impeller (1) is installed at an air inlet of the diffuser (2), and the diffuser (2) is communicated with a reflux device (3) through an air supply channel (7); air supply passage (7) are including diffusion passageway (21), switching-over passageway (6) and backflow channel (32), diffusion passageway (21) intercommunication diffuser (2) air intake, and switching-over passageway (6) set up between diffusion passageway (21) and backflow channel (32), diffusion passageway (21) are inside diffuser (2), and backflow ware (3) inside is provided with a plurality of return-flow ware blades (31), backflow channel (32) set up between return-flow ware blade (31), its characterized in that: the air inlet (51) is communicated with the reflux device (3), the air inlet (51) is communicated with the air supplementing port (52), and the air supplementing port (52) is arranged at the rear end of the air outlet of the reflux device (3); and a cooling channel (4) is arranged on the inner wall of the backflow channel (32), and the cooling channel (4) is communicated with an inlet end (41) and an outlet end (42).
2. A centrifugal compressor as claimed in claim 1, wherein: a spherical buffer cavity (53) is arranged between the air inlet (51) and the reflux device blade channel (311).
3. A centrifugal compressor as claimed in claim 1, wherein: and the cooling medium in the cooling channel (4) is a compressor refrigerant or water.
4. A centrifugal compressor as claimed in claim 1, wherein: the cross section of the cooling channel (4) is circular, semicircular or rectangular.
5. A centrifugal compressor as claimed in claim 1, wherein: the cooling channel (4) is a cooling coil.
6. A centrifugal compressor as claimed in claim 1, wherein: and an air outlet of the reflux device (3) is connected with a secondary impeller (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122013838.2U CN215719595U (en) | 2021-08-25 | 2021-08-25 | Centrifugal compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122013838.2U CN215719595U (en) | 2021-08-25 | 2021-08-25 | Centrifugal compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215719595U true CN215719595U (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122013838.2U Active CN215719595U (en) | 2021-08-25 | 2021-08-25 | Centrifugal compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215719595U (en) |
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2021
- 2021-08-25 CN CN202122013838.2U patent/CN215719595U/en active Active
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