Novel air suspension centrifugal blower

Abstract

The invention relates to the technical field of air blowers, in particular to a novel air suspension centrifugal blower which comprises a motor body, a rotor is arranged in the motor body, and a first compressor shell and a second compressor shell which are symmetrical are arranged at the two ends of the motor body correspondingly. A first impeller and a second impeller are symmetrically arranged at the two ends of the rotor respectively, the first impeller comprises a first compressor impeller and a second compressor impeller which are arranged back to back, and the second impeller comprises a third compressor impeller and a fourth compressor impeller which are arranged back to back. The first impeller and the second impeller are both of a back-to-back structure, the axial force generated by the first impeller and the axial force generated by the second impeller can be offset basically, and therefore the thrust bearing can be designed to be small in bearing face to obtain high shafting efficiency, and the reliability of the air blower is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of blowers, and in particular to a novel air suspension centrifugal blower. Background Art

[0002] Blowers play a vital role in sewage treatment. They are mainly used for oxygen aeration. By injecting oxygen into the water body, they promote biological oxidation reactions in the water, thereby improving sewage treatment efficiency.

[0003] With the changes in the sewage treatment industry to multiple working conditions and different treatment tank depths, the blower is required to have higher efficiency and pressure ratio in different wide flow ranges. For ordinary air suspension centrifugal blowers, the compressor flow range is fixed and the flow cannot be adjusted according to the working conditions of the treatment tanks with different depths and water levels. As a result, the blower cannot guarantee high efficiency in a wide flow range under many working conditions, making the energy-saving performance of air suspension centrifugal blowers worse.

[0004] Ordinary blowers adopt a single compressor or a double compressor structure, and use thrust bearings to balance the axial forces at both ends. Under certain design conditions, the axial force is large, and when thrust bearings are needed, the shaft system efficiency has to be reduced to improve the reliability of the blower.

[0005] Therefore, it is necessary to improve the blower structure to achieve a good match with multiple working conditions of different liquid level depths in the sewage pool. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a novel air suspension centrifugal blower, which is specifically achieved through the following technical solutions: A novel air suspension centrifugal blower comprises a motor body, wherein a rotor is arranged inside the motor body, wherein two ends of the motor body are respectively provided with a symmetrical first compressor casing and a second compressor casing, wherein two ends of the rotor are respectively provided with a symmetrical first impeller and a second impeller, wherein the first impeller is located in a first impeller cavity of the first compressor casing, and the second impeller is located in a second impeller cavity of the second compressor casing; a first main air inlet is arranged at one end of the first compressor casing, wherein the first main air inlet is connected to the first impeller cavity through a first flow channel at an inlet of the compressor casing, a first air outlet is arranged at the top of the first compressor casing, wherein the first air outlet is connected to the first impeller cavity through a first flow channel at an outlet of the compressor casing, and a side of the first compressor casing A first auxiliary air inlet is provided, and the first auxiliary air inlet is connected to the first impeller cavity through a second flow channel of the compressor casing inlet; a second main air inlet is provided at one end of the second compressor casing, and the second main air inlet is connected to the second impeller cavity through a fourth flow channel of the compressor casing inlet; a second air outlet is provided at the top of the second compressor casing, and the second air outlet is connected to the second impeller cavity through a second flow channel of the compressor casing outlet; a second auxiliary air inlet is provided on one side of the second compressor casing, and the second auxiliary air inlet is connected to the second impeller cavity through a third flow channel of the compressor casing inlet; the first impeller includes a first compressor impeller and a second compressor impeller arranged back to back, and the second impeller includes a third compressor impeller and a fourth compressor impeller arranged back to back.

[0007] Preferably, flow regulating mechanisms are installed at the outer ends of the first auxiliary air inlet and the second auxiliary air inlet.

[0008] Preferably, the first compressor impeller and the second compressor impeller as well as the third compressor impeller and the fourth compressor impeller are all designed to be separate.

[0009] Preferably, spline grooves are arranged in the middle of the first compressor impeller, the second compressor impeller, the third compressor impeller and the fourth compressor impeller, and splines matching the spline grooves are arranged at both ends of the rotor.

[0010] Preferably, the first compressor impeller and the second compressor impeller as well as the third compressor impeller and the fourth compressor impeller are all integrally formed.

[0011] After adopting the above technical solution, the beneficial effects of the present invention are: 1. The first impeller and the second impeller both adopt a back-to-back structure, and the axial forces generated by each can basically offset each other. Therefore, the thrust bearing can be designed with a smaller bearing surface to obtain higher shaft system efficiency and effectively improve the reliability of the blower; 2. According to the performance requirements of different liquid level change operating points in the sewage treatment tank, the air intake volume is adjusted through the flow regulating mechanism, so that the blower has higher efficiency at different operating points and achieves high energy saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of another embodiment of the present invention; Figure 3 This is a schematic diagram of the installation of the motor rotor.

[0014] Explanation of the reference numerals: 1-first flow channel at the compressor casing inlet, 2-first compressor impeller, 3-second compressor impeller, 4-first flow channel at the compressor casing outlet, 5-second flow channel at the compressor casing inlet, 6-third flow channel at the compressor casing inlet, 7-third compressor impeller, 8-second flow channel at the compressor casing outlet, 9-fourth compressor impeller, 10-fourth flow channel at the compressor casing inlet; 11-motor intermediate body, 12-compressor casing, 13-outlet flow channel, 14-motor rotor, 15-air hole, 16-inlet flow channel, 17-double-suction impeller, 18-impeller chamber, 19-front air hole, 20-front magnetic bearing casing, 21-cooling fan, 22-rear air hole, 23, rear magnetic bearing casing, 24-thrust flange. DETAILED DESCRIPTION

[0015] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0016] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0017] See also Figure 1 The embodiment of the present invention provides a novel air suspension centrifugal blower, comprising a motor body, wherein two ends of the motor body are respectively fixedly connected to a first compressor casing and a second compressor casing which are symmetrical to each other. A rotor is arranged inside the motor body, and two ends of the rotor are respectively arranged to have a symmetrical first impeller and a second impeller, wherein the first impeller is located in a first impeller cavity of the first compressor casing, and the second impeller is located in a second impeller cavity of the second compressor casing.

[0018] A first main air inlet is provided at one end of the first compressor casing, and the first main air inlet is connected to the first impeller chamber through a first flow channel 1 at the compressor casing inlet. A first air outlet is provided at the top of the first compressor casing, and the first air outlet is connected to the first impeller chamber through a first flow channel 4 at the compressor casing outlet. A first auxiliary air inlet is provided at one side of the first compressor casing, and the first auxiliary air inlet is connected to the first impeller chamber through a second flow channel 5 at the compressor casing inlet.

[0019] A second main air inlet is provided at one end of the second compressor casing, and the second main air inlet is connected to the second impeller chamber through the fourth flow channel 10 at the compressor casing inlet. A second air outlet is provided at the top of the second compressor casing, and the second air outlet is connected to the second impeller chamber through the second flow channel 8 at the compressor casing outlet. A second auxiliary air inlet is provided at one side of the second compressor casing, and the second auxiliary air inlet is connected to the second impeller chamber through the third flow channel 6 at the compressor casing inlet.

[0020] Flow regulating mechanisms are installed at the outer ends of the first auxiliary air inlet and the second auxiliary air inlet. The first impeller includes a first compressor impeller 2 and a second compressor impeller 3 with blades having opposite rotation directions. The second impeller includes a third compressor impeller 7 and a fourth compressor impeller 9 with blades having opposite rotation directions.

[0021] The first impeller has the same structure as the second impeller, and the following embodiments are described in detail by taking the first impeller as an example.

[0022] There are two types of connection relationships between the first compressor impeller 2 and the second compressor impeller 3, one is a split design, and the other is an integrated design.

[0023] In the integrated design, the first compressor impeller 2 and the second compressor impeller 3 are arranged back to back, formed by casting or by turning and milling a whole cylindrical part by a CNC machine tool, or the first compressor impeller 2 and the second compressor impeller 3 are arranged back to back and connected into an integrated part by welding.

[0024] In the split design, the first compressor impeller 2 and the second compressor impeller 3 are both independent components, which is convenient for later disassembly and maintenance. The first compressor impeller 2 and the second compressor impeller 3 are both provided with spline grooves in the middle, and splines adapted to the spline grooves are provided at both ends of the rotor. The first compressor impeller 2 and the second compressor impeller 3 are arranged back to back and sleeved on the outside of the spline. The blade end of the second compressor impeller 3 is abutted against the thrust bearing or shaft key of the rotor, and the blade end of the first compressor impeller 2 is abutted against the nut at the end of the rotor.

[0025] By back-to-back arrangement, the first compressor impeller 2 and the second compressor impeller 3 (or the third compressor impeller 7 and the fourth compressor impeller 9) can support each other, and the axial forces acting on them can offset each other, thereby reducing the load on the pump shaft and the bearing. This balancing effect can reduce the size and cost of the equipment and improve its operating efficiency and reliability. The thrust bearing can also be designed with a smaller bearing surface to obtain a higher shaft system efficiency, effectively improving the reliability of the blower.

[0026] Under low flow conditions, the flow regulating mechanisms on the first auxiliary air inlet and the second auxiliary air inlet are in a closed state, only the first compressor impeller 2 and the fourth compressor impeller 9 are working, and the second compressor impeller 3 and the third compressor impeller 7 are in an "idling" state (the first auxiliary air inlet and the second auxiliary air inlet are closed, the air circulation is cut off, and the second compressor impeller 3 and the third compressor impeller 7 cannot compress the air), and the outside air enters the first flow channel 1 of the compressor casing inlet (or the fourth flow channel 10 of the compressor casing inlet) from the first main air inlet (or the second main air inlet) and enters the first impeller chamber (or the second impeller chamber) for compression, and the pressurized gas flows to the first air outlet (or the second air outlet) through the first flow channel 4 of the compressor casing outlet (or the second flow channel 8 of the compressor casing outlet).

[0027] Under high flow conditions, the flow regulating mechanisms on the first and second auxiliary air inlets are in the open state, and the size of the opening is determined according to the water depth (the centrifugal blower is used for oxygen aeration in sewage treatment). The first compressor impeller 2, the second compressor impeller 3, the third compressor impeller 7, and the fourth compressor impeller 9 all participate in the work, and a part of the outside air enters the first impeller chamber (or the second impeller chamber) from the first main air inlet (or the second main air inlet) along the first flow channel 1 of the compressor casing inlet (or the fourth flow channel 10 of the compressor casing inlet) for compression, and another part of the outside air enters the first impeller chamber (or the second impeller chamber) from the first auxiliary air inlet (or the second auxiliary air inlet) along the second flow channel 5 of the compressor casing inlet (or the third flow channel 6 of the compressor casing inlet) for compression, and finally the two high-pressure air flows merge into the first flow channel 4 of the compressor casing outlet (or the second flow channel 8 of the compressor casing outlet).

[0028] See also Figure 2In order to improve the heat dissipation efficiency, the present invention proposes another embodiment of a novel air suspension centrifugal blower. The air suspension centrifugal blower includes a motor intermediate body 11 (i.e., the motor body in Embodiment 1), and symmetrical compressor casings 12 (corresponding to the first compressor casing and the second compressor casing in Embodiment 1) are arranged at both ends of the motor intermediate body 11. A motor rotor 14 (corresponding to the rotor in Embodiment 1) is arranged inside the motor intermediate body 11, and double-suction impellers 17 (corresponding to the first impeller in Embodiment 1) are arranged at both ends of the motor rotor 14, and the double-suction impeller 17 is located in the impeller chamber 18 of the compressor casing 12. An inlet flow channel 16 (corresponding to the first compressor casing inlet flow channel 1 in Embodiment 1) connected to the impeller chamber 18 is arranged at one end of the compressor casing 12, and the impeller chamber 18 is also connected to the inner cavity of the motor intermediate body 11, and an outlet flow channel 13 (corresponding to the first compressor casing outlet flow channel 4 in Embodiment 1) connected to the impeller chamber 18 is arranged on one side of the compressor casing 12. A plurality of air holes 15 are formed on the shell of the motor intermediate body 11 , and the air holes 15 are covered with filter membranes.

[0029] When in operation, the double-suction impeller 17 will generate two airflows, one of which enters from the inlet flow channel 16, and the other passes through the air hole 15 into the motor intermediate body 11, and then merges into the outlet flow channel 13 together with the air flow entering from the inlet flow channel 16. This not only realizes the compression and transportation of gas, but also significantly improves the heat dissipation efficiency of the blower by increasing the airflow path and heat dissipation area, so that it can continue to operate efficiently under large flow conditions.

[0030] See also Figure 3 A rear magnetic bearing housing 23 is provided at one end of the motor intermediate body 11, and a plurality of groups of rear air holes 22 distributed circumferentially are provided on the rear magnetic bearing housing 23. A thrust flange 24 is provided on the inner wall of the other end of the motor intermediate body 11, and a plurality of groups of front air holes 19 distributed circumferentially are provided on the thrust flange 24. A front magnetic bearing housing 20 is fixed to one side of the thrust flange 24, and the motor rotor 14 is installed between the front magnetic bearing housing 20 and the rear magnetic bearing housing 23 through an air bearing, and a cooling fan 21 is installed at one end of the motor rotor 14 close to the front magnetic bearing housing 20. The gap between the stator in the motor intermediate body 11 and the inner wall of the motor intermediate body 11 forms a first heat dissipation channel, and the gap between the stator and the motor rotor 14 forms a second heat dissipation channel.

[0031] The airflow first enters the motor intermediate body 11, and is divided into two streams under the action of the double-suction impellers 17 on both sides. The first airflow flows along the first heat dissipation channel, reaches the rear magnetic bearing housing 23, passes through the rear air hole 22 and enters the impeller chamber 18 on the same side. The second airflow flows along the first heat dissipation channel, reaches the thrust flange 24, passes through the front air hole 19 and enters the impeller chamber 18 on the same side. The rotation of the motor rotor 14 drives the cooling fan 21 to rotate, and part of the airflow is introduced into the second heat dissipation channel. In this process, the airflow in the second heat dissipation channel not only helps dissipate heat, but also forms an air film between the motor rotor 14 and the air bearing, avoiding physical contact and reducing friction. The airflow in the second heat dissipation channel finally passes through the rear air hole 22 into the impeller chamber 18 on the same side and merges into the first airflow.

[0032] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel air suspension centrifugal blower, comprising a motor body, wherein a rotor is arranged inside the motor body, and characterized in that: The two ends of the motor body are respectively provided with a symmetrical first compressor casing and a second compressor casing, and the two ends of the rotor are respectively provided with a symmetrical first impeller and a second impeller, the first impeller is located in a first impeller cavity of the first compressor casing, and the second impeller is located in a second impeller cavity of the second compressor casing, a first main air inlet is provided at one end of the first compressor casing, the first main air inlet is connected to the first impeller cavity through a first flow channel (1) at an inlet of the compressor casing, a first air outlet is provided at the top of the first compressor casing, the first air outlet is connected to the first impeller cavity through a first flow channel (2) at an outlet of the compressor casing, and a first air outlet is connected to the first impeller cavity through a first flow channel (3) at an outlet of the compressor casing. A flow channel (4) is connected to the first impeller cavity, a second main air inlet is provided at one end of the second compressor casing, the second main air inlet is connected to the second impeller cavity through a fourth flow channel (10) at the compressor casing inlet, a second air outlet is provided at the top of the second compressor casing, the second air outlet is connected to the second impeller cavity through a second flow channel (8) at the compressor casing outlet, the first impeller comprises a first compressor impeller (2) and a second compressor impeller (3) arranged back to back, and the second impeller comprises a third compressor impeller (7) and a fourth compressor impeller (9) arranged back to back.

2. The novel air suspension centrifugal blower according to claim 1 is characterized in that: A first auxiliary air inlet is provided on one side of the first compressor casing, and the first auxiliary air inlet is connected to the first impeller chamber through a second flow channel (5) at the compressor casing inlet. A second auxiliary air inlet is provided on one side of the second compressor casing, and the second auxiliary air inlet is connected to the second impeller chamber through a third flow channel (6) at the compressor casing inlet.

3. The novel air suspension centrifugal blower according to claim 2 is characterized in that: The outer ends of the first auxiliary air inlet and the second auxiliary air inlet are both equipped with flow regulating mechanisms.

4. The novel air suspension centrifugal blower according to claim 1 is characterized in that: The first compressor impeller (2) and the second compressor impeller (3) as well as the third compressor impeller (7) and the fourth compressor impeller (9) are all designed to be separate.

5. The novel air suspension centrifugal blower according to claim 4 is characterized in that: The first compressor impeller (2) and the second compressor impeller (3) as well as the third compressor impeller (7) and the fourth compressor impeller (9) are provided with spline grooves in the middle, and both ends of the rotor are provided with splines adapted to the spline grooves.

6. The novel air suspension centrifugal blower according to claim 1 is characterized in that: The first compressor impeller (2) and the second compressor impeller (3) as well as the third compressor impeller (7) and the fourth compressor impeller (9) are all integrally formed.

7. The novel air suspension centrifugal blower according to claim 1 is characterized in that: A plurality of air holes (15) are provided on the motor body, and the air holes (15) are covered with a filter membrane.

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