Efficient multi-wing centrifugal fan capable of enhancing gas mixing capacity and adjusting method of efficient multi-wing centrifugal fan

Abstract

The invention relates to the field of fans, in particular to an efficient multi-wing centrifugal fan capable of enhancing gas mixing capacity and an adjusting method of the efficient multi-wing centrifugal fan. The fan comprises a volute, a current collector, a plurality of fuel gas inflow cylinders, an air inflow cylinder, an impeller and a base plate, and the volute is provided with an air inlet and an air outlet; the collector is connected and communicated with the air inlet, the inner diameter of the collector is gradually reduced from the end away from the air inlet to the end close to the air inlet, and the reduction rate is gradually reduced; the plurality of fuel gas inflow cylinders are arranged on the circumferential wall of the middle position of the flow collector in the axial direction in the circumferential direction of the flow collector, and the axial directions of the fuel gas inflow cylinders are perpendicular to the axial direction of the flow collector; the air inflow cylinder is installed at the end, away from the air inlet, of the flow collector. The impeller is mounted in the volute; the base plate is installed on the outer side of the air outlet, an airflow guide ring is arranged at the position right opposite to the air outlet, and a plurality of spiral guide grooves are formed in the inner wall of the airflow guide ring. According to the invention, quick mixing of air and gas can be realized, and the operation efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the field of fans, and in particular to a high-efficiency multi-blade centrifugal fan with enhanced air mixing capability and a regulating method thereof. Background Art

[0002] In today's industrial production and energy utilization and many other important fields, centrifugal fans are important equipment that plays a key role in gas transportation and mixing. The quality of their performance will have a direct impact on production efficiency and will also play a key role in energy utilization. However, traditional centrifugal fans often have significant deficiencies in gas mixing capacity, such as:

[0003] First, the unreasonable design of the air and gas inlets leads to uneven air intake, making it difficult to achieve efficient mixing of gas and air.

[0004] Secondly, the shape and structural design of the air flow outlet are not scientific enough, and the gas flow is not smooth enough, which is not conducive to the smooth entry of the gas into the downstream pipeline, affecting the operating efficiency of the entire system.

[0005] Third, there is a lack of effective measures to reduce the friction between the gas and the pipe wall, which leads to large energy loss and limited flow rate during the transportation process.

[0006] Therefore, it is urgent to design a centrifugal fan that can solve the above technical problems. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a high-efficiency multi-blade centrifugal fan with enhanced gas mixing capability, which can achieve rapid mixing of air and gas and improve operating efficiency.

[0008] In order to solve the above technical problems, the technical solution of the present invention is: a high-efficiency multi-blade centrifugal fan with enhanced air mixing capacity, comprising:

[0009] A volute, provided with an air inlet and an air outlet;

[0010] A collector connected to and in communication with the air inlet, wherein the inner diameter of the collector gradually decreases from an end away from the air inlet to an end close to the air inlet, and the decreasing rate gradually decreases;

[0011] A plurality of gas inlet tubes are arranged on the peripheral wall of the collector at the middle position in the axial direction along the circumference of the collector, and the axial directions are respectively perpendicular to the axial direction of the collector;

[0012] An air inlet cylinder is installed at the end of the collector away from the air inlet;

[0013] an impeller mounted in the volute;

[0014] The backing plate is installed on the outer side of the air outlet, and an airflow guide ring is arranged at a position facing the air outlet, and a plurality of spiral guide grooves are arranged on the inner wall of the airflow guide ring.

[0015] Furthermore, a volute tongue is provided on the side of the volute, and the air outlet is provided at the free end of the volute tongue; wherein,

[0016] The cross section of the volute tongue perpendicular to the gas flow direction is trapezoidal, and the cross section area of ​​the volute tongue perpendicular to the gas flow direction gradually decreases along the gas flow direction.

[0017] In order to further reduce the gas leakage at the connection between the pad and the gas outlet, the pad is a rubber pad, and the airflow guide ring is arranged in the middle position of the rubber pad.

[0018] Furthermore, six gas inlet tubes are provided.

[0019] A specific structure of an impeller is further provided, wherein the impeller comprises two end rings and a plurality of arc-shaped blades; wherein,

[0020] A plurality of arc-shaped blades are connected between the two end rings and are arranged in a rotational manner;

[0021] A guide vane is arranged at the middle position of the convex side of each arc-shaped blade; or at least two guide vanes are arranged at intervals along the length direction of the convex side of each arc-shaped blade, and a gap is left between the edge guide vane and the end ring close to it.

[0022] Furthermore, a gap is left between the guide plate and the guide plate it faces.

[0023] The present invention also relates to a method for adjusting a high-efficiency multi-blade centrifugal fan with enhanced air mixing capability, comprising:

[0024] S1, start the fan, open the air valve that controls the air flow of the air inlet cylinder and the gas valve that controls the gas flow of the gas inlet cylinder, and monitor the mixing effect, flow and pressure data;

[0025] S2, adjust the opening of the air valve and the gas valve until the preset flow rate is reached;

[0026] S3, gradually increase the fan speed until the pressure reaches the preset pressure; wherein, after each adjustment of the fan speed, wait for the pressure to stabilize and confirm whether the pressure meets the requirements;

[0027] S4, detect the composition of the mixed gas, fine-tune the opening of the air valve and the gas valve, and adjust the mixed gas ratio until the mixed gas reaches the preset air-fuel ratio;

[0028] S5, the fan enters the stable operation stage, and monitors the operating parameters at preset time intervals. If the operating parameters do not meet the preset range, return to S2.

[0029] After adopting the above technical solution, the present invention has the following beneficial effects:

[0030] 1. The present invention sets the collector to a throat-like structure, which can speed up the air entry speed and provide a certain negative pressure to the gas in the gas inlet tube, thereby speeding up the gas entry speed into the collector. In addition, the axial direction of the gas inlet tube is perpendicular to the axial direction of the collector, which can effectively accelerate the mixing of gas and air and improve the gas mixing efficiency and gas mixing capacity.

[0031] 2. The present invention also configures an airflow guide ring at the air outlet. The spiral guide groove of the airflow guide ring causes the wall-attached airflow to rotate, increase the flow rate, and reduce the friction between the airflow and the wall of the downstream pipeline, thereby improving the efficiency of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The schematic diagram of the structure of the high-efficiency multi-blade centrifugal fan with enhanced air mixing capability of the present invention;

[0033] Figure 2 for Figure 1 a partial enlarged view of a cross-sectional view of;

[0034] Figure 3 for Figure 1 Another cross-sectional view of;

[0035] Figure 4 It is a structural schematic diagram of the pad of the present invention;

[0036] Figure 5 It is a structural schematic diagram of the impeller of the present invention;

[0037] Figure 6 It is a flow chart of the adjustment method of the high-efficiency multi-blade centrifugal fan with enhanced air mixing capability of the present invention;

[0038] In the figure, 1, volute; 11, air inlet; 12, air outlet; 13, volute tongue; 2, collector; 3, gas inlet tube; 4, air inlet tube; 5, impeller; 51, end ring; 52, arc-shaped blades; 521, guide vane; 6, pad; 61, air flow guide ring; 611, spiral guide groove; 62, fixed installation hole. DETAILED DESCRIPTION

[0039] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0040] like Figures 1 to 5 As shown, a high-efficiency multi-blade centrifugal fan with enhanced air mixing capability comprises:

[0041] The volute 1 is provided with an air inlet 11 and an air outlet 12;

[0042] The collector 2 is connected to and communicates with the air inlet 11, and its inner diameter gradually decreases from the end far from the air inlet 11 to the end close to the air inlet 11, and the decreasing rate gradually decreases;

[0043] A plurality of gas inlet tubes 3 are arranged on the peripheral wall of the collector 2 at the middle position in the axial direction along the circumference of the collector 2, and the axial directions are respectively perpendicular to the axial direction of the collector 2;

[0044] The air inlet cylinder 4 is installed at the end of the collector 2 away from the air inlet 11;

[0045] An impeller 5 is installed in the volute 1;

[0046] The backing plate 6 is installed on the outer side of the air outlet 12 , and an airflow guide ring 61 is arranged at a position directly facing the air outlet 12 , and a plurality of spiral guide grooves 611 are arranged on the inner wall of the airflow guide ring 61 .

[0047] Specifically, in this embodiment, the collector 2 is configured to have a throat-like structure, which can speed up the air entry speed and provide a certain negative pressure to the gas in the gas inlet tube 3, thereby speeding up the gas entry speed into the collector 2. In addition, the axial direction of the gas inlet tube 3 is perpendicular to the axial direction of the collector, which can effectively accelerate the mixing of gas and air, improve the gas mixing efficiency and gas mixing capacity, and facilitate the dynamic adjustment of the gas and air ratio in the early stage; this embodiment also configures an airflow guide ring 61 at the air outlet 12, and the spiral guide groove 611 of the airflow guide ring 61 causes the wall-adhering airflow to rotate, increase the flow rate, and reduce the friction between the airflow and the pipe wall of the downstream pipe, thereby improving the efficiency of the fan.

[0048] The number of the gas inlet tubes 3 can be three, four, five, six, etc. Figure 1 In the structure shown, six gas inlet tubes 3 are provided, and the central angle between adjacent gas inlet tubes 3 is 60 degrees.

[0049] like Figure 1 As shown, the air inlet cylinder 4 is cylindrical. In addition, the motor driving the impeller 5 to rotate can be placed in the volute 1; it can also be arranged outside the volute 1, extending into the volute 1, and connected to the impeller 5.

[0050] In one embodiment, Figure 1 and Figure 3 As shown, a volute tongue 13 is provided on the side of the volute 1, and an air outlet 12 is provided at the free end of the volute tongue 13;

[0051] The cross section of the volute tongue 13 perpendicular to the gas flow direction is trapezoidal, and the cross-sectional area of ​​the volute tongue 13 perpendicular to the gas flow direction gradually decreases along the gas flow direction.

[0052] Such an arrangement can generate a force for the gas to gather toward the center, so that the gas can flow smoothly into the airflow guide ring 6 and then into the downstream pipeline.

[0053] In one embodiment, the pad 6 is a rubber pad, and the airflow guide ring 61 is arranged in the middle of the rubber pad.

[0054] Specifically, the rubber pad has a certain elasticity, and can better fit with the gas outlet 12 to reduce gas leakage. In addition, the rubber pad is relatively soft and will not cause excessive resistance to the airflow, which helps to improve the flow efficiency of the gas.

[0055] like Figure 1 and Figure 4 As shown, the pad 6 is exactly the same size as the outer side of the air outlet 12. A plurality of fixing holes 62 are provided in the peripheral area of ​​the pad 6, and bolts pass through the fixing holes 62 to install the pad 6 on the air outlet 12. In order to improve the sealing performance, a sealant can also be arranged between the pad 6 and the air outlet 12.

[0056] In one embodiment, Figure 5 As shown, the impeller 5 includes two end rings 51 and a plurality of arc-shaped blades 52; wherein,

[0057] A plurality of arc-shaped blades 52 are connected between the two end rings 51 and are arranged in a rotational manner;

[0058] A guide vane 521 is provided in the middle of the convex side of each arc-shaped blade 52; or at least two guide vanes 521 are provided at intervals along the length direction of the convex side of each arc-shaped blade 52, and a gap is left between the edge guide vane 521 and the end ring 51 close thereto.

[0059] Specifically, the conventional impeller 5 is not provided with a guide vane 702, while the arc-shaped blade 52 in this embodiment is provided with a guide vane 521, so that the airflow entering the fan can flow more smoothly along a specific path, reduce the turbulence and eddy current of the airflow, and improve the air intake efficiency of the fan.

[0060] exist Figure 5 In the structure shown, three guide vanes 521 are provided on each arc-shaped blade 52 .

[0061] In one embodiment, a gap is left between the guide vane 521 and the arc-shaped blade 52 it faces. The guide vane 521 can be of equal width or of unequal width.

[0062] like Figure 6 As shown, a method for adjusting a high-efficiency multi-blade centrifugal fan with enhanced air mixing capability as described in the above embodiment comprises:

[0063] S1, start the fan, open the air valve that controls the air flow of the air inlet cylinder 4 and the gas valve that controls the gas flow of the gas inlet cylinder, and monitor the mixing effect, flow and pressure data;

[0064] S2, adjust the opening of the air valve and the gas valve until the preset flow rate is reached;

[0065] During this process, the flow meter value is monitored in real time.

[0066] S3, gradually increase the fan speed until the pressure reaches the preset pressure; wherein, after each adjustment of the fan speed, wait for the pressure to stabilize and confirm whether the pressure meets the requirements;

[0067] S4, detect the composition of the mixed gas, fine-tune the opening of the air valve and the gas valve, and adjust the mixed gas ratio until the mixed gas reaches the preset air-fuel ratio;

[0068] S5, the fan enters the stable operation stage, and monitors the operating parameters at preset time intervals. If the operating parameters do not meet the preset range, return to S2. The operating parameters include flow, pressure, air-fuel ratio, etc.

[0069] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A high-efficiency multi-blade centrifugal fan with enhanced air mixing capability, characterized in that: include: A volute (1) is provided with an air inlet (11) and an air outlet (12); A collector (2) connected to and in communication with the air inlet (11), wherein the inner diameter of the collector gradually decreases from the end away from the air inlet (11) to the end close to the air inlet (11), and the decreasing rate gradually decreases; A plurality of gas inlet tubes (3) are arranged on the peripheral wall of the collector (2) at the middle position in the axial direction along the circumference of the collector (2), and the axial directions are respectively perpendicular to the axial direction of the collector (2); An air inlet cylinder (4) mounted on the end of the collector (2) away from the air inlet (11); An impeller (5) is installed in the volute (1); The backing plate (6) is installed on the outside of the air outlet (12), and an airflow guide ring (61) is arranged at a position directly opposite to the air outlet (12), and a plurality of spiral guide grooves (611) are arranged on the inner wall of the airflow guide ring (61).

2. The high-efficiency multi-blade centrifugal fan with enhanced air mixing capability according to claim 1, characterized in that: A volute tongue (13) is provided on the side of the volute (1), and the air outlet (12) is provided at the free end of the volute tongue (13); wherein: The cross section of the volute tongue (13) perpendicular to the gas flow direction is trapezoidal, and the cross-sectional area of ​​the volute tongue (13) perpendicular to the gas flow direction gradually decreases along the gas flow direction.

3. The high-efficiency multi-blade centrifugal fan with enhanced air mixing capability according to claim 1, characterized in that: The pad (6) is a rubber pad, and the airflow guide ring (61) is arranged at the middle position of the rubber pad.

4. The high-efficiency multi-blade centrifugal fan with enhanced air mixing capability according to claim 1, characterized in that: Six gas inlet cylinders (3) are provided.

5. The high-efficiency multi-blade centrifugal fan with enhanced air mixing capability according to claim 1, characterized in that: The impeller (5) comprises two end rings (51) and a plurality of arc-shaped blades (52); wherein: A plurality of arc-shaped blades (52) are connected between the two end rings (51) and are arranged in a rotational manner; A guide vane (521) is arranged at a middle position of the convex side of each arc-shaped blade (52); or at least two guide vanes (521) are arranged at intervals along the length direction on the convex side of each arc-shaped blade (52), and a gap is left between the guide vane (521) at the edge and the end ring (51) adjacent thereto.

6. The high-efficiency multi-blade centrifugal fan with enhanced air mixing capability according to claim 5, characterized in that: A gap is left between the guide plate (521) and the guide plate (521) it faces.

7. A method for adjusting a high-efficiency multi-blade centrifugal fan with enhanced air mixing capability as claimed in any one of claims 1 to 6, characterized in that: include: S1, start the fan, open the air valve for controlling the air flow of the air inlet cylinder (4) and the gas valve for controlling the gas flow of the gas inlet cylinder, and monitor the mixing effect, flow and pressure data; S2, adjust the opening of the air valve and the gas valve until the preset flow rate is reached; S3, gradually increase the fan speed until the pressure reaches the preset pressure; wherein, after each adjustment of the fan speed, wait for the pressure to stabilize and confirm whether the pressure meets the requirements; S4, detect the composition of the mixed gas, fine-tune the opening of the air valve and the gas valve, and adjust the mixed gas ratio until the mixed gas reaches the preset air-fuel ratio; S5, the fan enters the stable operation stage, and monitors the operating parameters at preset time intervals. If the operating parameters do not meet the preset range, return to S2.

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