CN213270406U - Adjustable diffuser blade structure - Google Patents
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- CN213270406U CN213270406U CN202021504864.4U CN202021504864U CN213270406U CN 213270406 U CN213270406 U CN 213270406U CN 202021504864 U CN202021504864 U CN 202021504864U CN 213270406 U CN213270406 U CN 213270406U
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Abstract
The utility model relates to an adjustable diffuser blade structure is applicable to centrifugal compressor (especially being applicable to compressed air energy storage system centrifugal compressor) dynamic measurement blade surface load. The front edge, the middle part and/or the tail edge of the pressure surface and/or the suction surface of the diffuser blade are/is provided with first pressure measuring holes on the surface of the blade, first internal pressure leading channels communicated with the first pressure measuring holes in a one-to-one correspondence mode are arranged in the blade, and finally, the gas leading-out ports which are arranged on the amplifying end face of the amplifying shower part and are in one-to-one correspondence with the fourth internal pressure leading channels are communicated with an external diffuser pressure measuring unit by gas pipe fittings through second internal pressure leading channels, third internal pressure leading channels and fourth internal pressure leading channels which are arranged on the transmission connecting part, the locking ring part and the amplifying shower part and are communicated with the first internal pressure leading channels in a one-to-one correspondence mode.
Description
Technical Field
The utility model belongs to the technical field of centrifugal compressor tests, a adjustable diffuser blade structure is related to, concretely relates to adjustable diffuser suitable for dynamic measurement pressure surface, suction surface load under the centrifugal compressor complete machine operational environment can be applied to the test of adjustable diffuser blade surface load when centrifugal compressor design operating mode and variable operating mode.
Background
The compressed air energy storage technology is used as a key technology in the fields of distributed renewable energy application and future smart grid and micro-grid construction, and provides an important support for realizing the utilization of large-scale new energy resources, namely safety, reliability, low carbon, environmental protection, high efficiency and economy. The centrifugal compressor is a core component of a compressed air energy storage system, and is used for converting electric energy to be stored into working medium internal energy and pressure potential energy, and the energy conversion efficiency of the centrifugal compressor can directly influence the overall efficiency and energy storage economy of the system.
The diffuser is an important part of the centrifugal compressor next to the centrifugal impeller, and has the function of mainly decelerating high-speed airflow at the outlet of the centrifugal impeller so as to effectively convert kinetic energy into pressure potential energy. The basic type of diffuser is divided into two types, namely a vaneless diffuser and a vaned diffuser, and the vane diffuser can be divided into a single-row vane diffuser, a half-high vane (rib) diffuser, a serial vane diffuser, a splitter vane diffuser, a wedge vane diffuser and other types. Wherein single-row vane diffuser is the most commonly used type in the vane diffuser, also the utility model discloses the type of adjustable diffuser among the test system, its air current angle through the adjustment incoming flow improves the diffusion degree at reasonable within range as far as possible. The single-row blade diffuser has shorter flow passage and smaller flow loss under the design working condition; but because of the existence of the blade, the impact loss is larger when the working condition is changed; particularly, when the attack angle is too large, the flow channel is easy to be seriously separated, so that the phenomena of stall and surge are caused, and the stable operation working condition is narrower.
Because the flow in the diffuser is complex three-dimensional viscous flow, the internal flow loss accounts for about 30% of the stage loss, the aerodynamic performance of the diffuser has important influence on the efficiency, the pressure ratio, the variable working condition operation and the like of the whole diffuser, and a large amount of test data is often needed as analysis guidance in order to improve the optimization design capability of the diffuser. However, in the pneumatic performance test research disclosed at present, the wind tunnel simulation test of the static plane blade cascade and the annular blade cascade is simple and easy, and accurate parameters of the centrifugal compressor in a real operation environment are difficult to reflect; few single-stage or multi-stage dynamic tests exist, and the test research of the whole machine in the running environment is very little, because the cost of the dynamic whole machine test research and the test bed equipment is high, the unstable dynamic test difficulty is high, and the effective acquisition, processing and analysis of high-frequency data are difficult.
SUMMERY OF THE UTILITY MODEL
The above-mentioned shortcoming and not enough to prior art, the utility model provides an adjustable diffuser blade structure is applicable to dynamic measurement diffuser blade surface load under the centrifugal compressor operational environment, and it utilizes the internal flow pressure passageway from the blade surface to enlargiing the gondola water faucet terminal surface to draw forth the local static pressure in blade surface, can be under centrifugal compressor complete machine operational environment, export arbitrary blade diffuser pressure surface of circumference, suction surface load real-time feedback. The method is different from the traditional blade diffuser cascade wind tunnel test, and the measured blade surface load test data can reflect real parameters of the centrifugal compressor in the whole machine operation environment and can effectively guide the blade optimization design of the diffuser; the angle of the diffuser is adjustable through the transmission fixing part, the change rule of the surface loads of the pressure surface and the suction surface of the blade diffuser in the adjusting process is researched, and the function and the reason of the adjustable diffuser in the variable working condition operation process are analyzed; in addition, the influence of the circumferential asymmetry of the volute on the surface load distribution of the pressure surface and the suction surface of the vane diffuser can be analyzed by simultaneously arranging the plurality of adjustable diffusers at different circumferential positions.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
an adjustable diffuser vane structure suitable for dynamically measuring the surface load of a diffuser vane in the operating environment of a centrifugal compressor comprises a vane air inlet part, a transmission connecting part, a locking ring part and an amplifying shower part, and is characterized in that,
the blade air inlet portion includes a plurality of first pressure measuring holes disposed on the surface of the blade and a plurality of first internal pressure guiding passages disposed inside the blade, each of the first internal pressure guiding passages is in one-to-one correspondence with each of the first pressure measuring holes, and each of the first pressure measuring holes is formed as an air inlet of each of the first internal pressure guiding passages;
the transmission connecting part is arranged at a part of the blade transmission shaft, which is close to the blade, and is used for being in transmission connection with an external blade installation angle adjusting mechanism, and the external blade installation angle adjusting mechanism is used for adjusting the installation angle of the diffuser blade by driving the transmission connecting part to rotate; a plurality of second internal pressure guide channels extending along the axial direction are arranged in the transmission connecting part, and the outlet ends of the second internal pressure guide channels are communicated with the inlet ends of the first internal pressure guide channels in a one-to-one correspondence manner;
-said locking ring portion is coaxially and detachably connected to the end of said drive connection portion, and has a plurality of third internal pressure-inducing channels extending in the axial direction disposed therein, and inlet ends of said third internal pressure-inducing channels are in one-to-one correspondence with outlet ends of said second internal pressure-inducing channels;
the enlarged showerhead part is integrally a rotary body whose cross section is enlarged gradually, and is disposed at the end of the locking ring part in the axial direction, the enlarged showerhead part is internally provided with a plurality of fourth internal pressure introduction passages which are inclined in space and uniformly arranged, the inlet end of each fourth internal pressure introduction passage is communicated with the outlet end of each third internal pressure introduction passage in a one-to-one correspondence, the outlet end of each fourth internal pressure introduction passage is formed on the enlarged end face of the enlarged showerhead part, and the outlet end of each fourth internal pressure introduction passage is formed as an air flow outlet communicated with the external pressure measuring unit.
Preferably, each of the first pressure measuring holes is distributed on the pressure surface and/or the suction surface of the blade.
Further, the first pressure measuring holes are distributed and arranged at the front edge, the middle part and/or the tail edge of the pressure surface and/or the suction surface of the blade.
Preferably, the outer surface of the locking ring portion is formed as a polygonal prism surface to facilitate engagement with a setting tool.
Preferably, the locking ring portion is preferably formed at the center thereof with a cavity extending in the axial direction, and the ends of the driving connection portion are inserted into the cavity and connected to each other by a screw thread to secure the reliability of the assembly between the locking ring portion and the driving connection portion.
Preferably, in order to ensure the sealing performance of the assembly between the locking ring part and the transmission connecting part and ensure that the internal pressure leading channels are not communicated with each other, a porous gasket is arranged on the assembly end face between the locking ring part and the transmission connecting part.
Preferably, the amplifying shower head part and the locking ring part are integrally formed, and an outlet end of each of the fourth internal pressure introduction channels is formed as a tubular air outlet having a certain length and evenly distributed on an amplifying end surface of the amplifying shower head part, and each of the tubular air outlets is used for communicating with an external pressure measuring unit.
Furthermore, the external pressure measuring unit at least comprises a multi-channel pressure scanning valve, and each tubular gas outlet is respectively communicated with a pressure measuring channel of the multi-channel pressure scanning valve through a gas pipe fitting so as to realize surface load measurement of a pressure surface and/or a suction surface of the diffuser blade.
Another technical object of the utility model is to provide an adjustable diffuser, adjustable diffuser radially sets up in the periphery of centrifugal compressor impeller export, a serial communication port, adjustable diffuser includes an annular mounting panel, a plurality of above-mentioned diffuser blades and a blade installation angle adjustment mechanism, each the diffuser blade all rotationally sets up through the blade transmission shaft that sets up in its bottom annular mounting panel is last, and each the diffuser blade is evenly arranged along circumference.
The utility model discloses an adjustable diffuser blade structure, through setting up first pressure cell on diffuser blade surface, and draw the pressure passageway in the inside first inside that sets up and each first pressure cell one-to-one intercommunication of blade, and through at the transmission coupling part, the locking ring subtotal, the inside pressure passageway that draws of second of the one-to-one intercommunication that enlargies the gondola water faucet part and set up, the inside pressure passageway that draws of third, the inside pressure passageway that draws of fourth, finally draw forth the mouth through the air current that sets up on the terminal surface that enlargies the gondola water faucet part, and utilize the gas pipe fitting to realize that the air current draws forth mouth and outside pressure measurement unit intercommunication, utilize the local static pressure that draws forth the blade surface from the inner flow pressure passageway of diffuser blade surface to enlarging gondola water faucet terminal surface promptly, finally realize diffuser blade surface load.
Compared with the prior art, the utility model discloses an adjustable diffuser blade structure has following advantage: by arranging the first pressure measuring holes on the surface of the blade at the front edge, the middle part and/or the tail edge of the pressure surface and/or the suction surface of the diffuser blade, and first internal pressure leading channels which are correspondingly communicated with the first pressure measuring holes one by one are arranged in the blade, and finally, the air flow leading-out ports which are arranged on the amplifying end surface of the amplifying shower head part and correspond to the fourth internal pressure leading channels one by one are communicated with an external pressure measuring unit by utilizing the air pipe fittings, the local static pressure on the surface of the blade is led out by utilizing an inner flow pressure channel from the surface of the diffuser blade to the end surface of the amplifying shower head, and finally the measurement of the surface load of the diffuser blade is realized.
Drawings
Fig. 1 is a schematic view of the vane structure of the adjustable diffuser of the present invention.
Fig. 2 is the utility model discloses well lock ring and enlarged gondola water faucet integrated configuration sketch map.
Detailed Description
In order to make the purpose, technical solution and advantages of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to perform more detailed description on the technical solution in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. The structure and technical solution of the present invention will be further specifically described below with reference to the accompanying drawings, and an embodiment of the present invention is provided.
As shown in fig. 1 and 2, the adjustable diffuser vane structure of the present invention is suitable for dynamic measurement of vane surface load of a centrifugal compressor, and can be arranged on an annular diffuser mounting plate at different circumferential positions as required, and includes a vane air inlet portion 110, a transmission connecting portion 120, a locking ring portion 130 and an amplifying shower head portion 140.
The blade inlet portion 110, i.e. on the basis of the diffuser blade, can be respectively provided with a plurality of typical position measuring holes according to the difference that the measured surface is a pressure surface and a suction surface, i.e. a plurality of first pressure measuring holes 111 are arranged at the front edge, the middle part and/or the tail edge of the pressure surface and/or the suction surface, the position of each first pressure measuring hole 111 is determined by the result of CFD numerical analysis, a plurality of first internal pressure guide channels 112 are correspondingly arranged in the blade and are concentrated to the shaft end surface of the blade transmission shaft, and each first pressure measuring hole 111 is correspondingly formed as the air inlet of each first internal pressure guide channel 112.
The transmission connecting part 120 is arranged on a part, close to the blades, of the blade transmission shaft and is in transmission connection with an external blade installation angle adjusting mechanism, the external blade installation angle adjusting mechanism adjusts the installation angle of the diffuser blades by driving the transmission connecting part 120 to rotate, a plurality of second internal pressure-leading passages 121 extending along the axial direction are arranged in the blade transmission shaft of the transmission connecting part 120, and the outlet ends of the second internal pressure-leading passages 121 are communicated with the inlet ends of the first internal pressure-leading passages 112 arranged inside the blades in a one-to-one correspondence mode.
The locking ring portion 130 is coaxially and detachably connected to the end of the transmission connecting portion 120, and a plurality of third inner pressure introduction passages 131 extending in the axial direction are provided inside thereof, and the inlet ends of the third inner pressure introduction passages 131 are in one-to-one correspondence with the outlet ends of the second inner pressure introduction passages 121. To facilitate the removal connection between the locking ring portion 130 and the drive connection portion 120, the outer surface of the locking ring portion 130 is preferably formed as a polygonal prism surface to facilitate engagement with a removal tool such as a wrench. To secure the reliability of the fitting between the locking ring portion 130 and the driving connection portion 120, the locking ring portion 130 is preferably formed at the center thereof with a cavity extending in the axial direction, and the distal ends of the driving connection portion 120 are inserted into the cavity and connected to each other by a screw. In order to ensure the assembly tightness between the locking ring part 130 and the transmission connecting part 120 and ensure that the internal pressure guiding channels are not communicated with each other, a porous gasket is arranged at the assembly end surface between the locking ring part 130 and the transmission connecting part 120.
The amplifying shower part 140 is integrally formed as a rotary body having a cross section gradually enlarged, and is integrally formed with the locking ring part 130, and is axially disposed at the end of the locking ring part 130, the amplifying shower part 140 is internally provided with a plurality of spatially inclined and uniformly arranged fourth internal pressure introduction passages 141, an inlet end of each fourth internal pressure introduction passage 141 is in one-to-one correspondence with an outlet end of each third internal pressure introduction passage 131, an outlet end of each fourth internal pressure introduction passage 141 is formed on an amplifying end surface of the amplifying shower part 140, preferably, an outlet end of each fourth internal pressure introduction passage 141 is formed as a tubular air outlet 142 uniformly distributed on the amplifying end surface of the amplifying shower part 140 and having a certain length, and each tubular air outlet 142 is formed as an air flow outlet pipe for communicating with an external pressure measuring unit. And wherein, the external pressure measuring unit includes a multichannel pressure scanning valve at least, and each tubulose gas outlet 142 communicates with the pressure measurement passageway of multichannel pressure scanning valve through the gas pipe fitting respectively for realize the surface load measurement of pressure surface and/or the suction surface of diffuser blade.
The above-described configuration of the enlarged showerhead portion 140 is generally similar to a "showerhead configuration, but the inner flow medium is high pressure air. Through drawing forth the mouth with cloth hole too intensive, can not directly external air current outlet pipe's axle end face and carry out the same proportion and enlarge, on the tubulose gas outlet 142 of the enlarged terminal surface of "class gondola water faucet" structure, can directly hot jacket PU pipe draws forth the air current, and can guarantee that terminal gas outlet position arranges and the first pressure cell 111 one-to-one of blade inlet portion 110.
The utility model discloses an above-mentioned adjustable diffuser blade sets up on adjustable diffuser, and adjustable diffuser sets up the periphery in centrifugal compressor impeller export in the footpath. The adjustable diffuser comprises an annular mounting plate, a plurality of diffuser blades and a blade mounting angle adjusting mechanism, each diffuser blade is rotatably arranged on the annular mounting plate through a blade transmission shaft arranged at the bottom of the diffuser blade, and the diffuser blades are uniformly arranged along the circumferential direction.
When a centrifugal compressor closed test bed is used for testing, the general implementation process comprises the following steps:
according to the operation rules of a closed test bed of a centrifugal compressor, the starting sequence is as follows: air feed, power supply, oil supply, water supply, and shutdown sequence: the basic principles of water cut-off, oil cut-off, gas cut-off and power cut-off are operated as follows:
1. the preparation work before starting specifically comprises: starting instrument gas supply; starting power supply of each part of the test bed; starting an oil supply cycle; starting a water supply cycle of the heat exchanger; opening a high-pressure buffer tank for air supplement; before starting up, checking whether the computer monitoring interface program of the central control room is normal or not;
2. the starting operation specifically comprises the following steps: the opening degrees of 3 pressure regulating valves (a main pressure regulating valve, an auxiliary pressure regulating valve and a micro pressure regulating valve) at the low-pressure section of the main pipeline are all 100 percent; clicking forward rotation to start after the rotating speed of a given motor is 300r/min in a low-pressure shafting interface (the vibration of two ends of a coupler needs to be less than 45 mu m, or the coupler is automatically stopped); sequentially increasing the speed to 100% rotating speed according to the sequence of 300 → 500 → 700 → 900 → 1185(r/min) at intervals of about 3 min; adjusting 3 pressure adjusting valves (main, auxiliary and micro) at the low-pressure section of the main pipeline to start a performance curve test after reaching a specified rotating speed; switching to other rotating speeds, and performing performance curve tests at other rotating speeds;
3. the shutdown operation specifically comprises: 3 regulating valves of the main pipeline are all regulated to 100 percent of opening, and the rotating speed is gradually reduced to stop at intervals of about 1min according to the sequence of 1185 → 900 → 700 → 500 → 300 → 0 (r/min); opening an emptying valve to discharge the gas in the main pipeline; opening four valves (total liquid/gas drainage) in a shell/tube pass of the heat exchanger for 1min, closing, opening a drain valve at the bottom of the compressor and a rear oil stain valve, checking whether liquid leaks out or not, and then closing; closing the high-pressure buffer tank to supplement air; closing the water supply circulation of the heat exchanger; closing the oil supply circulation; closing the instrument gas supply; turning off power supply of each part of the test bed;
4. and finally, entering a central control room computer, and exporting and processing experimental data.
When the aerodynamic shape of the pressure surface and/or the suction surface of the diffuser blade needs to be optimally designed:
1. after the machine is disassembled, determining a certain typical position in the circumferential direction of the adjustable diffuser, mounting the pressure surface or the suction surface of the blade of the same adjustable diffuser to the position to be measured, then mutually matching and fixing the blade with the corresponding blade mounting angle adjusting mechanism, and finally lifting the diffuser-volute end to be matched with the impeller end;
2. communicating each tubular air outlet 142 of the diffuser vane with an external pressure measuring unit through a gas pipe fitting;
3. and carrying out related operation according to the implementation process of the general test, measuring the surface load of the pressure surface or the suction surface of the same adjustable diffuser blade at a certain circumferential position, reflecting the real parameters of the whole machine in the operating environment, and conveniently and effectively guiding the optimization design of the blades of the diffuser.
When the surface load change rule of the pressure surface and/or the suction surface of the diffuser blade in the adjusting process needs to be researched: the method is generally consistent with the operation flow when the aerodynamic shape of the diffuser blade is optimally designed, but in the measuring process, the function of adjusting the angle of the blade diffuser needs to be realized through the blade installation angle adjusting mechanism, so that the change rule of the surface loads of the pressure surface and the suction surface of the adjustable diffuser in the adjusting process is researched, and the function and the reason of the adjustable diffuser in the variable working condition operation process are analyzed.
When the influence of the circumferential asymmetry of the volute of the centrifugal compressor on the surface load distribution of the pressure surface and/or the suction surface of the diffuser blade needs to be analyzed: the method is basically consistent with the operation flow when the aerodynamic shape of the diffuser blade is optimally designed, but after disassembly, the typical positions of the adjustable diffuser in different circumferential directions need to be determined, then a plurality of pressure surfaces and suction surfaces of the adjustable diffuser are installed at positions to be measured, then the pressure surfaces and the suction surfaces are matched and fixed with corresponding blade installation angle adjusting mechanisms, and finally the diffuser-volute end is hoisted to be matched with the impeller end so as to analyze the influence of the circumferential asymmetry of the volute on the surface load distribution of the pressure surfaces and the suction surfaces of the adjustable diffuser.
Through the above-mentioned embodiment, the purpose of the utility model is realized completely effectively. Those skilled in the art will appreciate that the present invention includes, but is not limited to, what is described in the accompanying drawings and the foregoing detailed description. While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications, which are within the spirit and scope of the appended claims.
Claims (8)
1. An adjustable diffuser vane structure suitable for dynamically measuring diffuser vane surface load in the operating environment of a centrifugal compressor comprises a vane air inlet part, a transmission connecting part, a locking ring part and an amplifying shower part, and is characterized in that,
the blade air inlet portion includes a plurality of first pressure measuring holes disposed on the surface of the blade and a plurality of first internal pressure guiding passages disposed inside the blade, each of the first internal pressure guiding passages is in one-to-one correspondence with each of the first pressure measuring holes, and each of the first pressure measuring holes is formed as an air inlet of each of the first internal pressure guiding passages;
the transmission connecting part is arranged at a part of the blade transmission shaft, which is close to the blade, and is used for being in transmission connection with an external blade installation angle adjusting mechanism, and the external blade installation angle adjusting mechanism is used for adjusting the installation angle of the diffuser blade by driving the transmission connecting part to rotate; a plurality of second internal pressure guide channels extending along the axial direction are arranged in the transmission connecting part, and the outlet ends of the second internal pressure guide channels are communicated with the inlet ends of the first internal pressure guide channels in a one-to-one correspondence manner;
-said locking ring portion is coaxially and detachably connected to the end of said drive connection portion and is internally provided with a plurality of axially extending third internal pressure-inducing channels, the inlet end of each of said third internal pressure-inducing channels being in one-to-one correspondence with the outlet end of each of said second internal pressure-inducing channels;
the enlarged showerhead part is integrally a rotary body whose cross section is enlarged gradually, and is disposed at the end of the locking ring part in the axial direction, the enlarged showerhead part is internally provided with a plurality of fourth internal pressure introduction passages which are inclined in space and uniformly arranged, the inlet end of each fourth internal pressure introduction passage is communicated with the outlet end of each third internal pressure introduction passage in a one-to-one correspondence, the outlet end of each fourth internal pressure introduction passage is formed on the enlarged end face of the enlarged showerhead part, and the outlet end of each fourth internal pressure introduction passage is formed as an air flow outlet communicated with the external pressure measuring unit.
2. The adjustable diffuser vane structure of claim 1 wherein each of the first pressure taps is distributed on the pressure and/or suction side of the vane.
3. The adjustable diffuser vane structure of claim 2 wherein each of the first pressure taps is disposed at a leading edge, a middle portion, and/or a trailing edge of the pressure and/or suction side of the vane.
4. The adjustable diffuser vane structure of claim 1 wherein the outer surface of the locking ring portion is formed as a polygonal prism surface to facilitate engagement with a tool for removal.
5. The adjustable diffuser vane structure of claim 1 wherein the locking ring portion is formed at a center thereof as a cavity extending in an axial direction, and ends of the driving connection portion are inserted into the cavity and connected to each other by a screw to secure a reliability of the assembly between the locking ring portion and the driving connection portion.
6. The adjustable diffuser vane structure of claim 1 wherein a porous gasket is disposed at an assembly end surface between the locking ring portion and the transmission connection portion to ensure the sealing performance of the assembly between the locking ring portion and the transmission connection portion and to ensure that the internal pressure-leading passages do not communicate with each other.
7. The adjustable diffuser vane structure of claim 1 wherein the amplifying sprinkler head portion is integrally formed with the locking ring portion, and the outlet end of each of the fourth internal pilot pressure passages is formed as a tubular outlet port having a length uniformly distributed on the amplifying end surface of the amplifying sprinkler head portion, each of the tubular outlet ports being adapted to communicate with an external pressure measuring unit.
8. The adjustable diffuser vane structure of claim 7 wherein the external pressure measurement unit includes at least one multi-channel pressure scanning valve, and wherein each of the tubular outlet ports is in communication with a pressure measurement channel of the multi-channel pressure scanning valve via a gas pipe for surface load measurement of the pressure and/or suction surfaces of the diffuser vane.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021504864.4U CN213270406U (en) | 2020-07-27 | 2020-07-27 | Adjustable diffuser blade structure |
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| CN202021504864.4U CN213270406U (en) | 2020-07-27 | 2020-07-27 | Adjustable diffuser blade structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116557320A (en) * | 2023-06-05 | 2023-08-08 | 远东双诚风机(江苏)有限公司 | Active silencing type high-speed centrifugal fan |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116557320A (en) * | 2023-06-05 | 2023-08-08 | 远东双诚风机(江苏)有限公司 | Active silencing type high-speed centrifugal fan |
| CN116557320B (en) * | 2023-06-05 | 2024-01-02 | 远东双诚风机(江苏)有限公司 | Active silencing type high-speed centrifugal fan |
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