CN209925254U

CN209925254U - Centrifugal blower without axial force

Info

Publication number: CN209925254U
Application number: CN201920514963.1U
Authority: CN
Inventors: 王永茂; 李忠
Original assignee: XI'AN CASVENT BLOWER CO Ltd
Current assignee: XI'AN CASVENT BLOWER CO Ltd
Priority date: 2019-04-16
Filing date: 2019-04-16
Publication date: 2020-01-10
Anticipated expiration: 2029-04-16

Abstract

The utility model provides a centrifugal blower without axial force, wherein an impeller is arranged in a shell and is arranged on a rotating shaft; the air inlet flange is arranged on the side surface of the shell and is connected with the shell; the air outlet flange is arranged on the side face of the shell and connected with the shell, the air inlet flange, the first air inlet, the first air outlet, the second air inlet, the second air outlet and the air outlet flange are sequentially communicated, and the first impeller and the second impeller are arranged back to back; the backflow channel is communicated with the first air outlet and the second air inlet, the size of an inlet of the backflow channel is smaller than that of an outlet, the size of the backflow channel is gradually changed, and the outlet of the backflow channel is opposite to the second air inlet. The two impellers arranged back to back generate axial force to the shaft to counteract each other when the impellers rotate, and an impeller combination without the axial force is formed. The backflow channel decelerates the accelerated airflow, so that the total flowing amount of the airflow is ensured to be balanced, and the stable operation is ensured.

Description

Centrifugal blower without axial force

Technical Field

The utility model relates to a centrifugal blower field especially relates to no axial force's centrifugal blower.

Background

The centrifugal fan is a driven fluid machine which increases the pressure of gas and discharges the gas by means of input mechanical energy. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and draught of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and selecting grains; wind tunnel wind source and air cushion boat inflation and propulsion.

Traditional centrifugal blower has multiple working methods according to the connected mode with the motor, and the centrifugal blower who adopts the mode that synchronizing wheel and hold-in range are connected wherein just can make the impeller obtain the effect that is higher than motor speed, and based on high rotational speed motor is expensive, and the maintenance cost is also high, consequently adopts ordinary low-speed motor to connect hold-in range and hold-in range to drive the centrifugal blower of impeller and uses extensively, but the blast effect of formation is not good, and the wind speed is lower, is difficult to satisfy the user demand.

Meanwhile, in the use process of the common synchronous wheel, the problem that the synchronous belt is broken or falls off due to reasons such as motor acceleration, motor vibration and the like is solved, and meanwhile, the synchronous belt needs to be tensioned by adjusting the distance between the motor and the rotating shaft after being installed, so that the synchronous belt is extremely troublesome to install again. Therefore, the installation and fixation of the timing belt is a big reason for preventing the centrifugal blower from forming high-speed air flow.

This working method's centrifugal blower, improve the functioning speed and firstly adopt motor slew velocity, secondly adopt the higher synchronizing wheel of proportion, but at the operation, traditional air-blower is in the vibration of rotation in-process, the air current transports unsmooth and has leaded to singly improving the rotational speed of axis of rotation and be difficult to improve high performance price ratio acceleration.

In view of the above, a centrifugal blower without axial force has been proposed to solve the above problems.

Disclosure of Invention

An object of the utility model is to provide a centrifugal blower of no axial force, through setting up the two-stage impeller of no axial force, the conveying and the operating stability of optimizing the air current to realize that centrifugal blower carries out fast-speed blast air output.

The utility model discloses a technique be:

the centrifugal blower without axial force comprises a shell, a rotating shaft and an impeller, wherein the impeller is arranged in the shell and is arranged on the rotating shaft; the air inlet flange is arranged on the side surface of the shell and connected with the shell; the air outlet flange is arranged on the side face of the shell and connected with the shell, the impeller comprises a first impeller and a second impeller, the first impeller comprises a first air inlet and a first air outlet, the second impeller comprises a second air inlet and a second air outlet, the air inlet flange, the first air inlet, the first air outlet, the second air inlet, the second air outlet and the air outlet flange are sequentially communicated, and the first impeller and the second impeller are arranged back to back; the backflow channel is communicated with the first air outlet and the second air inlet, the size of an inlet of the backflow channel is smaller than that of an outlet, the size of the backflow channel is gradually changed, and the outlet of the backflow channel is opposite to the second air inlet. The relay type two-stage impeller is adopted for air transmission, so that blast output at high wind speed is effectively generated, and the use requirement of a high-speed centrifugal blower is met. The two impellers arranged back to back generate axial force to the shaft to offset each other when the impellers rotate, so that an impeller combination without the axial force is formed, the air blower runs stably, and the air blowing effect is improved by effectively increasing the rotating speed. The backflow channel decelerates the accelerated airflow, the air outlet speed of the first air outlet is guaranteed to be the same as the air inlet speed of the second air inlet, the flowing total amount of the airflow is guaranteed to be balanced, and stable operation is guaranteed.

As a further optimization of the scheme, a first sealing part is arranged between the first impeller and the second impeller, and the first sealing part separates the first air outlet from the second air outlet; the first sealing part is used for isolating the outside of the first air inlet from the outside of the first air outlet, and the second sealing part is used for isolating the outside of the second air inlet from the outside of the second air outlet. The first sealing part is adopted to separate the air outlets of the two impellers, so that the series flow and mutual interference of air flows are prevented. The second sealing member blocks the outer periphery of the impeller to prevent backflow.

As further optimization of the scheme, the wind power generation device further comprises a first wind gathering flow channel, wherein the first wind gathering flow channel is arranged outside the first air outlet and is communicated with the first air outlet and the second air inlet; the second air gathering flow channel is arranged outside the second air outlet and is communicated with the second air outlet and the backflow flow channel; the size of the inlet of the first air gathering flow channel is larger than that of the outlet, and the size of the first air gathering flow channel is gradually changed; the size of the inlet of the second air gathering channel is larger than that of the outlet, and the size of the second air gathering channel gradually changes.

The scheme is further optimized to further comprise a guide flow channel, the guide flow channel is arranged between the first air outlet and the backflow flow channel, the guide flow channel comprises a guide baffle, and the guide baffle is arranged at the air flowing corner in the guide flow channel. The guiding flow channel guides the airflow coming out of the first air gathering flow channel to the backflow flow channel, and smooth flowing of the airflow is guaranteed.

The further optimization as the scheme still includes the synchronizing wheel, and the synchronizing wheel is located the casing outside and overlaps and establish in the axis of rotation, and the synchronizing wheel is equipped with the bolt recess, is equipped with the bolt structure in the axis of rotation, and the bolt structure imbeds the bolt recess. The synchronous belt is fixed by two combined limiting blocks on the synchronous wheel, when the synchronous belt drives the synchronous wheel to rotate, the synchronous belt limits axial movement on the synchronous wheel, and can not fall off, so that the use requirement of the high-speed centrifugal blower is met. The stopper of combination formula is extremely convenient when changing the hold-in range simultaneously, only needs to dismantle the second stopper and can provide the hold-in range mounted position. The bolt structure is adopted to transmit the force of the synchronizing wheel and the rotating shaft, and the disassembly is flexible.

According to the scheme, the rotating shaft is provided with a first mounting hole, the synchronizing wheel is provided with a second mounting hole, and after the bolt structure is completely embedded into the bolt groove, the center line of the first mounting hole is overlapped with the center line of the second mounting hole. Adopt two mounting holes to carry out the second grade and fix, guarantee that the synchronizing wheel can not take place axial motion when rotating, further improve fixed effect.

As the further optimization of scheme, the synchronizing wheel includes first synchronizing wheel piece and second synchronizing wheel piece, and first synchronizing wheel piece is equipped with first stopper, and the second synchronizing wheel piece is equipped with the second stopper, and when the hold-in range was installed on the synchronizing wheel, first stopper and second stopper were located the both sides of hold-in range respectively.

According to the scheme, the first synchronizing wheel block is provided with a third mounting hole, the second synchronizing wheel block is provided with a fourth mounting hole, when the second synchronizing wheel block is sleeved on the first synchronizing wheel block, the central line of the third mounting hole coincides with the central line of the fourth mounting hole, and the third mounting hole and the fourth mounting hole form a second mounting hole. The third mounting hole and the fourth mounting hole are used for fixing the whole synchronizing wheel, and the first synchronizing wheel block and the second synchronizing wheel block are relatively fixed.

Compared with the prior art, the beneficial effects of the utility model are that:

the two impellers arranged back to back generate axial force to the shaft to offset each other when the impellers rotate, so that an impeller combination without the axial force is formed, the air blower runs stably, and the air blowing effect is improved by effectively increasing the rotating speed.

The air collecting flow channel, the guide flow channel and the backflow flow channel are arranged to form a smooth air flow channel in the shell, so that air flow can rapidly pass through the centrifugal blower, resistance generated by the flow channel is reduced, and the blowing air speed is improved.

The third mounting hole and the fourth mounting hole are used for fixing the whole synchronizing wheel, and the first synchronizing wheel block and the second synchronizing wheel block are relatively fixed. The bolt structure is adopted to transmit the force of the synchronizing wheel and the rotating shaft, and the disassembly is flexible.

Drawings

Fig. 1 is one of schematic structural diagrams of a centrifugal blower without axial force according to the present invention;

fig. 2 is a second schematic structural view of the centrifugal blower without axial force according to the present invention;

fig. 3 is one of the schematic structural diagrams of the synchronizing wheel of the centrifugal blower without axial force according to the present invention;

fig. 4 is a second schematic structural diagram of a synchronizing wheel of the centrifugal blower without axial force according to the present invention.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

Example 1:

referring to fig. 1-4, the centrifugal blower without axial force includes a casing 1, a rotating shaft 2 and an impeller, wherein the impeller is disposed inside the casing 1, and the impeller is mounted on the rotating shaft 2; the air conditioner also comprises an air inlet flange 11 and an air outlet flange 12, wherein the air inlet flange 11 is arranged on the side surface of the shell 1 and is connected with the shell 1; the air outlet flange 12 is arranged on the side surface of the shell 1 and connected with the shell 1, the impeller comprises a first impeller 31 and a second impeller 32, the first impeller 31 comprises a first air inlet and a first air outlet, the second impeller 32 comprises a second air inlet and a second air outlet, the air inlet flange 11, the first air inlet, the first air outlet, the second air inlet, the second air outlet and the air outlet flange 12 are sequentially communicated, and the first impeller 31 and the second impeller 32 are arranged back to back; the air conditioner further comprises a backflow flow channel 53, the backflow flow channel 53 is communicated with the first air outlet and the second air inlet, the size of an inlet of the backflow flow channel 53 is smaller than that of an outlet, the size of the backflow flow channel 53 is gradually changed, and the outlet of the backflow flow channel 53 is opposite to the second air inlet.

The relay type two-stage impeller is adopted for air transmission, so that blast output at high wind speed is effectively generated, and the use requirement of a high-speed centrifugal blower is met. The two-stage impeller is divided into two forms of simultaneous air blowing and relay air blowing, and based on the centrifugal air blower with axial air inlet provided in the embodiment, the simultaneous air blowing has large resistance and high cost. In this embodiment, the air inlet flange 11 is disposed at one end of the rotating shaft 2, and the airflow is transmitted from the first impeller 31 to the second impeller 32 and then to the air outlet flange 12, so as to form relay two-stage blowing. On one hand, axial air intake is adopted, and on the other hand, relay type air transmission is adopted to improve the flow speed of air flow.

The two impellers arranged back to back generate axial force to the shaft to offset each other when the impellers rotate, so that an impeller combination without the axial force is formed, the air blower runs stably, and the air blowing effect is improved by effectively increasing the rotating speed. In the traditional relay type two-stage impeller, two impellers are designed in the same swing direction, a larger axial force exists in the rotation process, and the bearing part and the sealing part are subjected to larger pressure in the use process, so that the problems of obvious vibration and poor sealing performance are caused. In this embodiment, two impellers are back-to-back design, and the axial force that two impellers that adopt same specification produced at the rotation in-process offsets each other, guarantees to rotate the in-process more stable, provides the basis for the motor acceleration rate, prevents that the motor acceleration rate from leading to the too big problem that appears of axial force.

Meanwhile, in the gas flowing process, once the blockage phenomenon occurs, the blowing efficiency of the air blower is greatly reduced, the blockage is more serious when the flow speed is higher, the impeller is not faster to rotate, the blowing effect is better when the flow speed is higher, and the rotation speed of the impeller can be further improved under the condition that the air flow is ensured to flow without obstruction.

The backflow channel 53 decelerates the accelerated airflow, so as to ensure that the air outlet speed at the first air outlet is the same as the air inlet speed at the second air inlet, ensure the balance of the total flowing amount of the airflow, and ensure stable operation. The air current after through the speed-up needs to carry out the centrifugation speed-up of second step through second impeller 32, but too fast air current flow direction also produces gaseous jam easily to the air intake of second impeller 32, consequently need suitably slow down the air current that has passed through the speed-up for the first time, guarantee that second impeller 32 during operation can form suction, rather than the air current directly rushes into second impeller 32, consequently, set up backward flow runner 53 and can suitably slow down the air current through first wind channel 51 that gathers, the air inlet of second impeller 32 reaches the equilibrium with the air-out of first impeller 31.

Through the scheme, the relay type two-stage impeller is adopted for air transmission, so that high-speed blast output is effectively generated, and the use requirement of a high-speed centrifugal blower is met. The two impellers arranged back to back generate axial force to the shaft to offset each other when the impellers rotate, so that an impeller combination without the axial force is formed, the air blower runs stably, and the air blowing effect is improved by effectively increasing the rotating speed. The backflow channel 53 decelerates the accelerated airflow, so as to ensure that the air outlet speed at the first air outlet is the same as the air inlet speed at the second air inlet, ensure the balance of the total flowing amount of the airflow, and ensure stable operation.

Example 2:

referring to fig. 1-4, the difference between this embodiment and embodiment 1 is that embodiment 1 mainly ensures high-speed operation of the centrifugal blower by improving stability of the operation process and smooth air flow transportation, and in this embodiment, the smooth flow of air in the housing 1 is improved by further optimizing the design of the air flow channel inside the housing 1.

In this embodiment, a first sealing member 33 is disposed between the first impeller 31 and the second impeller 32, and the first sealing member 33 separates the first air outlet from the second air outlet; the air conditioner further comprises a second sealing part 34, the second sealing part 34 separates the outside of the first air inlet from the outside of the first air outlet, and the second sealing part 34 separates the outside of the second air inlet from the outside of the second air outlet. The first sealing part is adopted to separate the air outlets of the two impellers, so that the series flow and mutual interference of air flows are prevented. The second sealing member blocks the outer periphery of the impeller to prevent backflow.

The first sealing part 33 is arranged between the two impellers, the two impellers form an independent working area, the series flow and mutual interference of air flow are prevented, the impeller vibration is caused by the interference and series flow of the air flow, the vibration is large in the operation process, the noise is large, and the stable operation is one of the bases for increasing the speed of the motor. Similarly, the air inlet of the impeller needs to be sealed, so that the problems of series flow and interference among the single impellers are prevented.

As further optimization of the scheme, the wind energy collecting device further comprises a first wind collecting flow channel 51, wherein the first wind collecting flow channel 51 is arranged outside the first air outlet, and the first wind collecting flow channel 51 is communicated with the first air outlet and the second air inlet; the second air gathering flow channel 52 is arranged on the outer side of the second air outlet, and the second air gathering flow channel 52 is communicated with the second air outlet and the backflow flow channel 53; the size of the inlet of the first wind gathering channel 51 is larger than that of the outlet, and the size of the first wind gathering channel 51 gradually changes; the size of the inlet of the second wind gathering channel 52 is larger than that of the outlet, and the size of the second wind gathering channel 52 is gradually changed. The air outlet of the impeller is provided with the air gathering flow channel, so that the speed of the air flow at the air outlet can be increased, and the effect of improving the output wind speed of blast air is achieved.

On the premise of adopting end suction and designing the rectifying component 4, the air intake process is obviously improved, and for how to fully exert the centrifugal effect of the relay type two-stage impeller, in this embodiment, the first air collecting channel 51 and the second air collecting channel 52 are arranged outside the first impeller 31 and the second impeller 32 to accelerate the air flow discharged by the two impellers, so that the air outlet of the impeller has no problem of air flow stagnation, and the impeller can continuously discharge air.

As a further optimization of the scheme, the air conditioner further includes a guiding flow passage 54, the guiding flow passage 54 is disposed between the first air outlet and the backflow flow passage 53, the guiding flow passage 54 includes a guiding baffle 541, and the guiding baffle 541 is disposed at a flowing corner of the air in the guiding flow passage 54. The guide flow path 54 guides the airflow from the first wind collecting flow path 51 to the return flow path 53, and ensures smooth flow of the airflow. The guide flow channel 54 can reduce the flow resistance of the gas in the flow channel of the housing 1, and when the gas flows at a corner with an angle smaller than 90 degrees, an obvious blocking phenomenon is generated, and the guide flow channel 54 effectively guides the gas to flow by designing the guide baffle 541 at the corner, so that the blowing effect of the blower is improved.

Example 3:

referring to fig. 1-4, the difference between this embodiment and embodiment 2 is how to optimize the synchronous pulley 6 so as to achieve stable running of the synchronous belt in the synchronous pulley 6, thereby ensuring that the rotational speed of the synchronous pulley 6 can be increased to increase the high-speed operation of the centrifugal blower.

Traditional centrifugal blower has multiple working methods according to the connected mode with the motor, and the centrifugal blower who adopts the mode that synchronizing wheel 6 and hold-in range are connected wherein just can make the impeller obtain the effect that is higher than motor speed, and based on high rotational speed motor is expensive, and the maintenance cost is also high, consequently adopts ordinary low-speed motor to connect hold-in range and hold-in range to drive the centrifugal blower of impeller and uses extensively, but the blast effect of formation is not good, and the wind speed is lower, is difficult to satisfy the user demand. Meanwhile, in the use process of the common synchronous wheel 6, the problem that the synchronous belt is broken or falls off due to reasons such as motor acceleration, motor vibration and the like is caused to the synchronous belt, and meanwhile, the synchronous belt needs to be tensioned by adjusting the distance between the motor and the rotating shaft 2 after being installed, so that the installation of the synchronous belt again is extremely troublesome. Therefore, the installation and fixation of the timing belt is a big reason for preventing the centrifugal blower from forming high-speed air flow. Therefore, in the embodiment, the synchronous belt is prevented from falling off and is easy to install by providing the synchronous wheel 6.

In this embodiment, still include synchronizing wheel 6, synchronizing wheel 6 locates the casing 1 outside and overlaps and establish on axis of rotation 2, and synchronizing wheel 6 is equipped with bolt recess 61, is equipped with bolt structure 21 on the axis of rotation 2, and bolt structure 21 imbeds bolt recess 61. The hold-in range adopts two stoppers of combination formula to fix on synchronizing wheel 6, and when hold-in range drive synchronizing wheel 6 rotated, the hold-in range had restricted the axial motion on synchronizing wheel 6, can not take place to drop, has satisfied high-speed centrifugal blower's use needs. The stopper of combination formula is extremely convenient when changing the hold-in range simultaneously, only needs to dismantle second stopper 651 and can provide the hold-in range mounted position. The bolt structure 21 is adopted to transmit the force between the synchronizing wheel 6 and the rotating shaft 2, and the disassembly is flexible.

As a further optimization of the scheme, the synchronizing wheel 6 includes a first synchronizing wheel block 64 and a second synchronizing wheel block 65, the first synchronizing wheel block 64 is provided with a first limiting block 641, the second synchronizing wheel block 65 is provided with a second limiting block 651, and when the synchronous belt is installed on the synchronizing wheel 6, the first limiting block 641 and the second limiting block 651 are respectively located at two sides of the synchronous belt.

In this embodiment, through designing synchronizing wheel 6 as the two half structures of combination formula, install on axis of rotation 2 through utilizing bolt structure 21 first synchronizing wheel piece 64 earlier when installing, overlap the hold-in range cover on first synchronizing wheel piece 64 back, the tensioning of hold-in range is adjusted to the distance of adjustment motor and axis of rotation 2, install second synchronizing wheel piece 65 on first synchronizing wheel piece 64 again, form and utilize first stopper 641 and second stopper 651 to the spacing of hold-in range, prevent breaking away from of hold-in range in the use. That is to say, solved high rotational speed and broken away from the problem, change the hold-in range simultaneously, dismantle down behind the second synchronizing wheel piece 65, directly just can have the space to install the hold-in range, need not adjust the motor and the distance of axis of rotation 2 unlike traditional spacing synchronizing wheel 6 in area, greatly improve change efficiency.

As a further optimization of the scheme, the rotating shaft 2 is provided with a first mounting hole 22, the synchronizing wheel 6 is provided with a second mounting hole 62, and after the bolt structure 21 is completely embedded into the bolt groove 61, the center line of the first mounting hole 22 coincides with the center line of the second mounting hole 62. Adopt two mounting holes to carry out the second grade and fix, guarantee that synchronizing wheel 6 can not take place axial motion when the pivoted, further improve fixed effect. Bolt structure 21 and bolt recess 61 are the transmission structure of power, and first mounting hole 22 and second mounting hole 62 are the structure of restriction axial motion, and synchronizing wheel 6 is rotating the in-process because the hold-in range probably leads to the production of axial force for the installation of aligning, and normal rotation in-process axial force is little, adopts two mounting holes can satisfy the requirement completely, installation and dismantlement and convenience.

As a further optimization of the scheme, the first synchronizing wheel block 64 is provided with a third mounting hole 642, the second synchronizing wheel block 65 is provided with a fourth mounting hole 652, when the second synchronizing wheel block 65 is sleeved on the first synchronizing wheel block 64, the central line of the third mounting hole 642 is overlapped with the central line of the fourth mounting hole 652, and the third mounting hole 642 and the fourth mounting hole 652 form a second mounting hole 62. The two combined synchronizing wheel blocks are used for fixing the entire synchronizing wheel 6 by the third mounting hole 642 and the fourth mounting hole 652, and for fixing the first and second synchronizing wheel blocks 65 relatively.

Through the scheme, the synchronous belt is fixed by the two combined limiting blocks on the synchronous wheel 6, when the synchronous belt drives the synchronous wheel 6 to rotate, the synchronous belt limits axial movement on the synchronous wheel 6, the synchronous belt cannot fall off, and the use requirement of a high-speed centrifugal air blower is met. The stopper of combination formula is extremely convenient when changing the hold-in range simultaneously, only needs to dismantle second stopper 651 and can provide the hold-in range mounted position. The bolt structure 21 is adopted to transmit the force between the synchronizing wheel 6 and the rotating shaft 2, and the disassembly is flexible.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The centrifugal blower without axial force comprises a shell (1), a rotating shaft (2) and an impeller, wherein the impeller is arranged in the shell (1), and is arranged on the rotating shaft (2); the air conditioner is characterized by further comprising an air inlet flange (11) and an air outlet flange (12), wherein the air inlet flange (11) is arranged on the side face of the shell (1) and connected with the shell (1); the air outlet flange (12) is arranged on the side surface of the shell (1) and connected with the shell (1), and is characterized in that the impeller comprises a first impeller (31) and a second impeller (32), the first impeller (31) comprises a first air inlet and a first air outlet, the second impeller (32) comprises a second air inlet and a second air outlet, the air inlet flange (11), the first air inlet, the first air outlet, the second air inlet, the second air outlet and the air outlet flange (12) are sequentially communicated, and the first impeller (31) and the second impeller (32) are arranged back to back; still include backward flow runner (53), backward flow runner (53) intercommunication first air outlet with the second air intake, the import size of backward flow runner (53) is less than the exit dimension, the size gradual change of backward flow runner (53), the export of backward flow runner (53) is just right the second air intake.

2. The centrifugal blower without axial force according to claim 1, wherein a first sealing member (33) is provided between the first impeller (31) and the second impeller (32), the first sealing member (33) blocking the first air outlet from the second air outlet; the air conditioner further comprises a second sealing part (34), the second sealing part (34) separates the outside of the first air inlet from the outside of the first air outlet, and the second sealing part (34) separates the outside of the second air inlet from the outside of the second air outlet.

3. The centrifugal blower without axial force according to claim 2, further comprising a first wind gathering channel (51), wherein the first wind gathering channel (51) is disposed outside the first wind outlet, and the first wind gathering channel (51) communicates the first wind outlet with the second wind inlet; the second air gathering flow channel (52) is arranged on the outer side of the second air outlet, and the second air gathering flow channel (52) is communicated with the second air outlet and the backflow flow channel (53); the size of the inlet of the first wind gathering flow passage (51) is larger than that of the outlet, and the size of the first wind gathering flow passage (51) is gradually changed; the size of the inlet of the second wind gathering flow channel (52) is larger than that of the outlet, and the size of the second wind gathering flow channel (52) is gradually changed.

4. The centrifugal blower without axial force according to claim 3, further comprising a guide flow passage (54), wherein the guide flow passage (54) is disposed between the first air outlet and the return flow passage (53), and wherein the guide flow passage (54) includes a guide baffle (541), and wherein the guide baffle (541) is disposed at a flow corner of the air in the guide flow passage (54).

5. The centrifugal blower without axial force according to claim 4, further comprising a synchronizing wheel (6), wherein the synchronizing wheel (6) is disposed outside the housing (1) and sleeved on the rotating shaft (2), the synchronizing wheel (6) is provided with a bolt groove (61), the rotating shaft (2) is provided with a bolt structure (21), and the bolt structure (21) is embedded in the bolt groove (61).

6. The centrifugal blower without axial force according to claim 5, wherein the rotating shaft (2) is provided with a first mounting hole (22), the synchronizing wheel (6) is provided with a second mounting hole (62), and after the latch structure (21) is completely inserted into the latch groove (61), the center line of the first mounting hole (22) coincides with the center line of the second mounting hole (62).

7. The centrifugal blower without axial force according to claim 6, wherein the synchronizing wheel (6) includes a first synchronizing wheel block (64) and a second synchronizing wheel block (65), the first synchronizing wheel block (64) is provided with a first stopper block (641), the second synchronizing wheel block (65) is provided with a second stopper block (651), and the first stopper block (641) and the second stopper block (651) are respectively located at both sides of the synchronous belt when the synchronous belt is installed on the synchronizing wheel (6).

8. The centrifugal blower without axial force according to claim 7, wherein the first synchronizing wheel block (64) is provided with a third mounting hole (642), the second synchronizing wheel block (65) is provided with a fourth mounting hole (652), when the second synchronizing wheel block (65) is sleeved on the first synchronizing wheel block (64), a center line of the third mounting hole (642) coincides with a center line of the fourth mounting hole (652), and the third mounting hole (642) and the fourth mounting hole (652) form the second mounting hole (62).