CN212155197U

CN212155197U - Multistage centrifugal fan

Info

Publication number: CN212155197U
Application number: CN202020404846.2U
Authority: CN
Inventors: 车旭阳; 李恩杰; 康学超; 靳晓波; 马春鹏; 修建平; 石杨; 郭晓云
Original assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Current assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Priority date: 2020-03-26
Filing date: 2020-03-26
Publication date: 2020-12-15
Anticipated expiration: 2030-03-26

Abstract

The utility model discloses a multistage centrifugal fan, place the impeller subassembly of middle casing in including inlet channel, middle casing, outlet channel, transmission shaft, inlet end bearing, the outlet end bearing and. The impeller assembly includes a pre-stage impeller assembly and a final stage impeller assembly. Has the advantages that: the air outlet channel is arranged between the last group of preceding-stage impeller assemblies and the last-stage impeller assembly and is arranged in the middle shell, so that the internal space of the middle shell is fully utilized, the axial length is reduced, and the occupied space is reduced; the middle shell is a cylindrical shell, so that the processing operation is simplified, and the production efficiency is improved; the diffuser and the reflux device in the preceding-stage impeller assembly share one partition plate, so that raw materials are saved, and the diffuser and the reflux device are mutually supported; the direction of the air outlet channel can be set according to actual needs, and the degree of matching with other equipment is improved.

Description

Multistage centrifugal fan

Technical Field

The utility model relates to a centrifugal fan technical field, concretely relates to multistage centrifugal fan.

Background

The multi-stage centrifugal fan is a rotating blade machine which converts mechanical energy into gas pressure energy. After the gas uniformly enters the impeller through the gas inlet chamber, most of the speed of the gas can be converted into pressure energy under the action of centrifugal force and diffusion in the impeller in the rotating blades, so that the gas is continuously compressed in several stages to obtain the required pressure. In the arrangement form of the structure of the existing multistage centrifugal fan, the air outlet channel of the centrifugal machine is spirally arranged behind the last stage impeller, namely the air outlet channel is spirally arranged at one end of the centrifugal fan. This arrangement limits the optimization of the axial length of the centrifugal fan. Especially when required pressure is great, and the compression level is more, centrifugal fan's axial length is longer, and it is big to occupy the space, can't satisfy the requirement of operating mode installation space. And air outlet channel spiral setting leads to the irregularity of fan external shape at centrifugal fan's one end, and is not pleasing to the eye, and the processing requirement to the fan casing is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects of the prior art and providing a multistage centrifugal fan, wherein the air outlet channel is arranged between the last group of preceding-stage impeller components and the last-stage impeller components and is arranged in the middle shell, so that the internal space of the middle shell is fully utilized, the axial length of the multistage centrifugal fan is reduced, the structure is more compact, the occupied space is reduced, and the adaptability to the installation space is enhanced; the middle shell is a cylindrical shell, so that the processing operation of the middle shell is simplified, the production efficiency is improved, and meanwhile, the spiral surface of the air outlet channel scroll is positioned in the middle shell, so that a rear machine cover of the middle shell maintains a planar structure, the aesthetic feeling is improved, and the processing requirement of the middle shell is reduced; the scroll channel borrows part of the shell of the middle shell and part of the side wall of the final diffuser, so that raw materials are saved, and the production cost is reduced; the diffuser and the reflux device in the preceding-stage impeller assembly share one partition plate, so that the mutual support of the diffuser and the reflux device is realized while the raw materials are further saved, and the integral structure is firmer and more reliable; the direction of the air outlet channel can be set according to actual needs, and the matching degree of the multistage centrifugal fan and other equipment is improved.

The purpose of the utility model is achieved through the following technical measures: the utility model provides a multistage centrifugal fan, includes inlet channel, middle casing, outlet channel, transmission shaft, inlet end bearing, the end bearing of giving vent to anger and places the impeller subassembly of middle casing in, the transmission shaft runs through middle casing and both ends are connected with the inlet end bearing respectively and the end bearing of giving vent to anger, the transmission shaft can drive impeller subassembly and rotate, impeller subassembly includes preceding stage impeller subassembly and final stage impeller subassembly, inlet channel passes the one end of middle casing and with preceding stage impeller subassembly's air inlet is connected, preceding stage impeller subassembly's gas outlet with final stage impeller subassembly's air inlet is connected, final stage impeller subassembly's gas outlet with the air inlet of outlet channel is connected, preceding stage impeller subassembly is more than a set of, the multiunit preceding stage impeller subassembly establishes ties, outlet channel sets up inside and lie in between last a set of preceding stage impeller subassembly and the final stage impeller subassembly of middle casing, and the air outlet of the air outlet channel penetrates through and extends to the outside of the middle shell.

Further, the preceding-stage impeller assembly comprises an impeller, a diffuser and a reflux device which are connected in sequence, and the final-stage impeller assembly comprises a final-stage impeller and a final-stage diffuser which are connected in sequence.

Further, the air outlet channel is located between the backflow device of the last group of preceding-stage impeller assemblies and the final-stage impeller and connected with the air inlet of the final-stage diffuser.

Further, the axial distance between the impeller in the preceding-stage impeller assembly in the last group and the impeller in the last group is larger than or equal to the axial distance between the impellers in the preceding-stage impeller assemblies in the other two adjacent groups.

Further, the diffuser and the return device in the preceding stage impeller assembly share a partition plate.

Further, middle casing is cylindrical casing, middle casing includes preceding cover, casing and back cover, the casing is hollow cylindrical structure, preceding cover and back cover respectively with the both ends of casing are connected, air outlet channel's gas outlet runs through and extends to the outside of casing.

Further, the air outlet channel comprises a vortex channel and an air outlet end channel, the vortex channel is arranged inside the middle shell, the air outlet end channel is arranged outside the middle shell, an air inlet of the vortex channel is connected with an air outlet of the last-stage impeller assembly, and an air outlet of the vortex channel is connected with an air inlet of the air outlet end channel.

Further, the vortex channel is a spiral channel with the radial sectional area gradually increasing, and the spiral surface of the vortex channel is positioned inside the middle shell.

Further, the multistage centrifugal fan further comprises a vortex channel which forms a vortex channel together with a part of the side wall of the final stage impeller assembly and a part of the casing of the middle casing.

Further, the direction of the air outlet channel can be set according to actual needs.

Compared with the prior art, the beneficial effects of the utility model are that: according to the multistage centrifugal fan, the air outlet channel is arranged between the last group of preceding-stage impeller assemblies and the last-stage impeller assemblies and is arranged in the middle shell, so that the internal space of the middle shell is fully utilized, the axial length of the multistage centrifugal fan is reduced, the structure is more compact, the occupied space is reduced, and the adaptability to the installation space is enhanced; the middle shell is a cylindrical shell, so that the processing operation of the middle shell is simplified, the production efficiency is improved, and meanwhile, the spiral surface of the air outlet channel scroll is positioned in the middle shell, so that a rear machine cover of the middle shell maintains a planar structure, the aesthetic feeling is improved, and the processing requirement of the middle shell is reduced; the scroll channel borrows part of the shell of the middle shell and part of the side wall of the final diffuser, so that raw materials are saved, and the production cost is reduced; the diffuser and the reflux device in the preceding-stage impeller assembly share one partition plate, so that the mutual support of the diffuser and the reflux device is realized while the raw materials are further saved, and the integral structure is firmer and more reliable; the direction of the air outlet channel can be set according to actual needs, and the matching degree of the multistage centrifugal fan and other equipment is improved.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Drawings

Fig. 1 is a schematic structural view of a 3-stage centrifugal fan.

Fig. 2 is a schematic structural diagram of a 2-stage centrifugal fan.

Fig. 3 is a side view of a multistage centrifugal fan.

Fig. 4 is a sectional view of the multistage centrifugal fan with the air outlet directed downward.

Fig. 5 is a sectional view of the multistage centrifugal fan with the air outlet directed to the right.

Fig. 6 is a sectional view of the multistage centrifugal fan with the air outlet directed upward.

Fig. 7 is a sectional view of the multistage centrifugal fan with the air outlet directed to the left.

The compressor comprises an air inlet channel 1, a front cover 2, a casing 3, a rear cover 4, a vortex channel 5, a transmission shaft 6, an air inlet end bearing 7, an air outlet end bearing 8, a first-stage impeller 9, a first-stage diffuser 10, a first-stage reflux device 11, a second-stage impeller 12, a second-stage diffuser 13, a second-stage diffuser 14, a second-stage reflux device 15, a last-stage impeller 16, a last-stage diffuser 17, an air outlet end channel 18, a vortex groove 18, a first partition plate 19, a second partition plate 20, a second partition plate 21 and a spiral surface.

Detailed Description

As shown in fig. 1 to 7, a multistage centrifugal fan includes an air inlet passage 1, a middle housing, an air outlet passage, a transmission shaft 6, an air inlet end bearing 7, an air outlet end bearing 8, and an impeller assembly built in the middle housing. The multistage centrifugal fan further comprises a mounting seat, and the mounting seat is used for mounting and fixing the multistage centrifugal fan. The transmission shaft 6 runs through middle casing and both ends are connected with inlet end bearing 6 and outlet end bearing 7 respectively, the transmission shaft 6 can drive the impeller subassembly and rotate, the impeller subassembly includes preceding stage impeller subassembly and final stage impeller subassembly, the impeller subassembly is established ties on the transmission shaft. Further preferably, the preceding-stage impeller assembly includes an impeller, a diffuser, and a reflux device connected in series, and the final-stage impeller assembly includes a final-stage impeller 15 and a final-stage diffuser 16 connected in series. Air intake duct 1 passes the one end of middle casing and with the air inlet of impeller is connected among the preceding stage impeller subassembly, among the preceding stage impeller subassembly the gas outlet of backward flow ware with last stage impeller 15's air inlet is connected among the last stage impeller subassembly, among the last stage impeller subassembly last stage diffuser 16's gas outlet with the air inlet of air outlet duct is connected, preceding stage impeller subassembly is more than a set of, the multiunit preceding stage impeller subassembly establishes ties.

When preceding stage impeller subassembly is when 2 groups above, inlet channel and first order the air inlet of impeller is connected among the preceding stage impeller subassembly, the multiunit preceding stage impeller subassembly is established ties, and last a set of the gas outlet of backward flow ware among the preceding stage impeller subassembly with last stage impeller 15's air inlet is connected among the last stage impeller subassembly. The air outlet channel is arranged in the middle shell and positioned between the reflux device in the last group of front-stage impeller assemblies and the final-stage impeller 15 in the final-stage impeller assemblies, and an air outlet of the air outlet channel penetrates through and extends to the outside of the middle shell. Through set up air outlet channel and place middle casing in between last a set of backward flow ware and last stage impeller 15 in, make full use of multistage centrifugal fan's inner space, reduced multistage centrifugal fan's axial length, the structure is compacter, has reduced multistage centrifugal fan's the space of taking up an area of, strengthens to installation space's adaptability.

The axial distance between the impellers in the last group of the preceding-stage impeller assemblies and the final-stage impeller 15 is greater than or equal to the axial distance between the impellers in the other two adjacent groups of the preceding-stage impeller assemblies. Because the exhaust pipeline is arranged between the last group of preceding-stage impeller assemblies and the last-stage impeller assembly, the axial distance between the impeller in the last group of preceding-stage impeller assemblies and the last-stage impeller 15 is properly increased, so that the installation and the disassembly of the exhaust channel can be facilitated. When the multistage centrifugal fan is a centrifugal fan of more than 3 stages, that is, the multistage centrifugal fan includes preceding-stage impeller assemblies and final-stage impeller assemblies of more than 2 groups, the axial distance between the impeller in the preceding-stage impeller assembly and the final-stage impeller 15 is greater than or equal to the axial distance between the impellers in two adjacent preceding-stage impeller assemblies, and the axial distance between the impeller in the preceding-stage impeller assembly and the final-stage impeller 15 is greater than the maximum width of the vortex path. When the multistage centrifugal fan is a 2-stage centrifugal fan, namely the multistage centrifugal fan comprises a set of preceding-stage impeller assembly and a set of final-stage impeller assembly, at the moment, only the axial distance between the impeller and the final-stage impeller 15 in the preceding-stage impeller assembly is required to be larger than the maximum width of the vortex channel.

The diffuser and the reflux device in the preceding stage impeller assembly share a partition plate. The raw materials are saved, and meanwhile, the diffuser and the reflux device are mutually supported, so that the integral structure is firmer and more reliable.

Middle casing is cylindrical casing, middle casing includes preceding cover 2, casing 3 and back cover 4, casing 3 is hollow cylindrical structure, preceding cover 2 and back cover 4 respectively with the both ends of casing 3 are connected, air outlet channel's gas outlet runs through and extends to the outside of casing 3. The middle shell adopts a cylindrical structure, so that the processing operation of the middle shell is simplified, and the production efficiency is improved.

The air outlet channel comprises a vortex channel 5 and an air outlet end channel 17, wherein the vortex channel 5 is arranged inside the middle shell, the air outlet end channel 17 is arranged outside the middle shell, the air inlet of the vortex channel 5 is connected with the air outlet of the last-stage impeller assembly, and the air outlet of the vortex channel 5 is connected with the air inlet of the air outlet end channel 17. Further preferably, the scroll 5 is a spiral channel with a gradually increasing radial cross-sectional area, and the spiral surface 21 of the scroll 5 is located inside the middle housing. The spiral surface 21 of the air outlet channel scroll 5 is positioned in the middle shell, so that the rear machine cover 4 of the middle shell maintains a plane structure, the aesthetic feeling is improved, and the processing requirement of the middle shell is reduced.

The multistage centrifugal fan further includes a scroll groove 18, the scroll groove 18 forming a scroll together with a portion of the side wall of the final stage impeller assembly and a portion of the casing of the intermediate casing. One side of the notch of the vortex groove 18 is connected with the casing 3, and the other side is connected with the final stage diffuser 16 to form a vortex passage 5 with an opening connected with the air outlet of the final stage diffuser 16. The volute 5 shares part of the casing 3 close to the final stage diffuser 16 and part of the side wall of the final stage diffuser 16, so that the raw materials are further saved, and the production cost is reduced.

The air outlet direction of the air outlet channel can be set according to actual needs. The direction of the air outlet channel can be changed by changing the spiral direction of the vortex channel 5 in the middle shell, for example, the direction of the air outlet can be upward or downward or leftward or rightward, etc. In the actual production process, the direction of the air outlet channel can be set according to the installation requirements of the multistage centrifugal fan and other equipment, and the matching degree of the multistage centrifugal fan and other equipment is improved.

Example 1

As shown in fig. 1, when the multistage centrifugal fan is a 3-stage centrifugal stage, the centrifugal stage includes an inlet passage 1, an intermediate housing, an outlet passage, a transmission shaft 6, an inlet end bearing 7, an outlet end bearing 8, a first-stage preceding-stage impeller assembly, a second-stage preceding-stage impeller assembly, and a final-stage impeller assembly. Middle casing includes preceding cover 2, casing 3 and back cover 4, one-level preceding stage impeller subassembly includes one-level impeller 9, one-level diffuser 10 and one-level backward flow ware 11, one-level diffuser 10 with a first space bar 19 of one-level backward flow ware 11 sharing. The second-stage preceding-stage impeller assembly comprises a second-stage impeller 12, a second-stage diffuser 13 and a second-stage return device 14, wherein the second-stage diffuser 13 and the second-stage return device 14 share a second partition plate 20. The final stage impeller assembly includes a final stage impeller 15 and a final stage diffuser 16. The axial distance between the secondary impeller 12 and the final impeller 15 is greater than or equal to the axial distance between the primary impeller 9 and the secondary impeller 12. The air outlet channel comprises a vortex channel 5 and an air outlet end channel 17, wherein the vortex channel 5 is formed by a vortex channel groove 18 and part of the shell of the machine shell 3 and part of the side wall of the final stage diffuser 16.

Casing 3 be hollow cylindrical structure and both ends respectively in preceding cover 2 is connected with back cover 4, cover 2, casing 3 and back cover 4 and both ends are connected in inlet end bearing 7 and the end bearing 8 of giving vent to anger respectively before transmission shaft 6 runs through in proper order. The air inlet passage 1 penetrates through the front cover 2 and is connected with the air inlet of the first-stage impeller 9, the air outlet of the first-stage impeller 9 is connected with the air inlet of the first-stage diffuser 10, the air outlet of the first-stage diffuser 10 is connected with the air inlet of the first-stage reflux device 11, the air outlet of the first-stage reflux device 11 is connected with the air inlet of the second-stage impeller 12, the air outlet of the second-stage impeller 12 is connected with the air inlet of the second-stage diffuser 13, the air outlet of the second-stage diffuser 13 is connected with the air inlet of the second-stage reflux device 14, the air outlet of the second-stage reflux device 14 is connected with the air inlet of the last-stage impeller 15, the air outlet of the last-stage impeller 15 is connected with the air inlet of the last-stage diffuser 16, the air outlet of the last-stage diffuser 16 is, the vortex channel 5 is spirally arranged between the secondary reflux device 14 and the final-stage impeller 15 and is positioned inside the machine shell 3, the spiral surface 21 of the vortex channel 5 is also positioned inside the machine shell 3, and the air outlet end channel 17 is arranged outside the machine shell 3.

Example 2

As shown in fig. 2, when the multistage centrifugal fan is a 2-stage centrifugal fan, the 2-stage centrifugal fan includes an air inlet passage 1, a middle housing, an air outlet passage, a transmission shaft 6, an air inlet bearing 7, an air outlet bearing 8, a first-stage preceding-stage impeller assembly, and a last-stage impeller assembly. Middle casing includes preceding cover 2, casing 3 and back cover 4, one-level preceding stage impeller subassembly includes one-level impeller 9, one-level diffuser 10 and one-level backward flow ware 11, one-level diffuser 10 with the first space bar of 19 of one-level backward flow ware 11 sharing. The final stage impeller assembly includes a final stage impeller 15 and a final stage diffuser 16. The air outlet channel comprises a vortex channel 5 and an air outlet end channel 17, wherein the vortex channel 5 is formed by a vortex channel groove 18 and part of the shell of the machine shell 3 and part of the side wall of the final stage diffuser 16.

Casing 3 be hollow cylindrical structure and both ends respectively in preceding cover 2 is connected with back cover 4, cover 2, casing 3 and back cover 4 and both ends are connected in inlet end bearing 7 and the end bearing 8 of giving vent to anger respectively before transmission shaft 6 runs through in proper order. The air inlet channel 1 penetrates through the front cover 2 and is connected with the air inlet of the first-stage impeller 9, the air outlet of the first-stage impeller 9 is connected with the air inlet of the first-stage diffuser 10, the air outlet of the first-stage diffuser 10 is connected with the air inlet of the first-stage reflux device 11, the air outlet of the first-stage reflux device 11 is connected with the air inlet of the final-stage impeller 15, the air outlet of the final stage impeller 15 is connected with the air inlet of the final stage diffuser 16, the air outlet of the final stage diffuser 16 is connected with the air inlet of the vortex passage 5, the air outlet of the vortex channel 5 is connected with the air inlet of the air outlet end channel 17, the vortex channel 5 is spirally arranged between the first-stage reflux device 11 and the final-stage impeller 15 and is positioned inside the machine shell 3, the spiral surface 21 of the vortex passage 5 is also positioned inside the casing 3, and the air outlet end channel 17 is arranged outside the casing 3.

It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a multistage centrifugal fan which characterized in that: including inlet channel, middle casing, outlet channel, transmission shaft, inlet end bearing, the end bearing of giving vent to anger and place the impeller subassembly of middle casing in, the transmission shaft runs through middle casing and both ends are connected with inlet end bearing and outlet end bearing respectively, the transmission shaft can drive the impeller subassembly and rotate, the impeller subassembly includes preceding stage impeller subassembly and final stage impeller subassembly, inlet channel passes the one end of middle casing and is connected with the air inlet of preceding stage impeller subassembly, the gas outlet of preceding stage impeller subassembly with the air inlet of final stage impeller subassembly is connected, the gas outlet of final stage impeller subassembly with the air inlet of outlet channel is connected, preceding stage impeller subassembly is more than a set of, the multiunit preceding stage impeller subassembly establishes ties, outlet channel sets up inside and lie in between last a set of preceding stage impeller subassembly and the final stage impeller subassembly of middle casing, and the air outlet of the air outlet channel penetrates through and extends to the outside of the middle shell.

2. The multi-stage centrifugal fan of claim 1, wherein: the front-stage impeller assembly comprises an impeller, a diffuser and a reflux device which are connected in sequence, and the final-stage impeller assembly comprises a final-stage impeller and a final-stage diffuser which are connected in sequence.

3. The multistage centrifugal fan of claim 2, wherein: and the air outlet channel is positioned between the reflux device of the last group of preceding-stage impeller assemblies and the final-stage impeller and is connected with the air inlet of the final-stage diffuser.

4. The multistage centrifugal fan of claim 2, wherein: and the axial distance between the impeller in the last group of the preceding-stage impeller assemblies and the impeller in the last stage is larger than or equal to the axial distance between the impellers in the other two adjacent groups of the preceding-stage impeller assemblies.

5. The multistage centrifugal fan of claim 2, wherein: the diffuser and the reflux device in the preceding stage impeller assembly share a partition plate.

6. The multi-stage centrifugal fan of claim 1, wherein: the middle shell is a cylindrical shell, the middle shell comprises a front cover, a shell and a rear cover, the shell is of a hollow cylindrical structure, the front cover and the rear cover are respectively connected with two ends of the shell, and an air outlet of the air outlet channel penetrates through and extends to the outside of the shell.

7. The multi-stage centrifugal fan of claim 1, wherein: the air outlet channel comprises a vortex channel and an air outlet end channel, the vortex channel is arranged inside the middle shell, the air outlet end channel is arranged outside the middle shell, an air inlet of the vortex channel is connected with an air outlet of the last-stage impeller assembly, and an air outlet of the vortex channel is connected with an air inlet of the air outlet end channel.

8. The multi-stage centrifugal fan of claim 7, wherein: the vortex channel is a spiral channel with the radial sectional area gradually increasing, and the spiral surface of the vortex channel is positioned inside the middle shell.

9. The multi-stage centrifugal fan of claim 7, wherein: the multistage centrifugal fan further comprises a vortex channel, and the vortex channel and part of the side wall of the middle shell and part of the side wall of the final-stage impeller assembly form a vortex channel together.

10. The multi-stage centrifugal fan of claim 1, wherein: the air outlet direction of the air outlet channel can be set according to actual needs.