CN204458511U - High-pressure axial flow fan impeller - Google Patents

Abstract

The utility model discloses a kind of high-pressure axial flow fan impeller, comprise wheel hub, one-level vane group and secondary vane group, wheel hub becomes conical structure wide at the top and narrow at the bottom from top to bottom, one-level vane group is distributed in wheel hub upper strata, secondary vane group is distributed in wheel hub lower floor, and one-level vane group comprises multiple one-level primary blades and multiple one-level back blades; Each one-level back blades is distributed between adjacent two one-level primary blades middle and lower parts; Secondary vane group comprises multiple secondary primary blades and multiple secondary back blades; Each secondary back blades is distributed between adjacent two secondary primary blades middle and lower parts; Wherein the ragged edge of one-level primary blades longitudinal direction is identical with the distance of hub centre with the ragged edge of secondary primary blades longitudinal direction with the distance of hub centre.The utility model meets the requirement not only with elevated pressures coefficient but also compact structure, the structure of increase system that simultaneously can not be too much and load.

Description

High pressure axial flow fan impeller

technical field

The utility model relates to a high-pressure axial-flow fan impeller, which is suitable for relatively high-pressure axial-flow fans and belongs to the technical field of fan and ventilation engineering.

Background technique

According to the current development trend of various ventilation projects in China, there are more and more underground system projects in large and medium-sized cities, such as various subways and underground parts of high-rise buildings. These underground system projects are becoming larger and more complex, among which axial flow fans occupy an important position in the ventilation system. Due to the particularity of these large and complex underground system projects being built underground, high pressure and compact structures are required for the ventilation system. Therefore, only by taking effective measures and selecting axial flow fans with high pressure coefficient and compact structure can the reasonable configuration of these underground system engineering ventilation systems be guaranteed.

In the existing situation, two axial flow fans are connected in series or the speed of the axial flow fans is increased to meet the demand for higher pressure. However, no matter which method is adopted, there will be different disadvantages, either increasing the structure of the system or increasing the load of the system, resulting in waste.

Chinese patent application number 201320237629.9 discloses a remote sprayer for counter-rotating fans, including a fan, an atomizing nozzle and a water supply system, the atomizing nozzle is installed at the air outlet of the fan, and the water supply system is the The nozzle supplies water. The fan includes the fan casing, the primary blade, the secondary blade, the primary blade motor and the secondary blade motor. The primary blade and the secondary blade are placed inside the fan casing, the primary blade faces the air outlet, and the The first-stage blades face the air inlet, and the first-stage blade motor and the second-stage blade motor are fixed inside the fan casing. The utility model avoids the flow loss of the vortex of the air flow, improves the efficiency and the total pressure, and increases the sprayed water volume and shooting range without changing the power. In the above-mentioned patent, the two blades are installed on the two hubs, which increases the load of the system.

Chinese patent application number 201010131360.7 discloses a double-impeller centrifugal blower, the motor of which is connected to the speed-increasing gearbox through a diaphragm coupling and adopts soft start; The outlet angle of the middle blade is 55-65°; the casing is horizontally split, and the upper casing is equipped with a balance air connection pipe, the single suction air inlet is rectangular, and the air outlet is circular; the seal includes a spiral seal and an air seal. . The fan of the invention has the advantages of small size, light weight, high rotating speed, high efficiency and the like. The above-mentioned patent also installs the two blades on the two hubs, which increases the load of the system.

Utility model content

The purpose of the utility model is to provide an impeller of a high-pressure axial flow fan, which meets the requirements of high pressure coefficient and compact structure, and at the same time does not increase the structure and load of the system too much.

High-pressure axial flow fan impeller, including the hub, the first-stage blade group and the second-stage blade group, the hub forms a conical structure from top to bottom with a wide top and a narrow bottom. In the lower layer, the first-level blade group includes multiple first-level main blades and multiple first-level auxiliary blades; each first-level auxiliary blade is distributed between the middle and lower parts of two adjacent first-level main blades; the second-level blade group includes multiple second-level blades. The first-stage main blade and multiple second-stage auxiliary blades; each second-stage auxiliary blade is distributed between the middle and lower parts of two adjacent second-stage main blades; the distance between the longitudinal outermost edge of the first-stage main blade and the center of the hub is the same as that of the second-stage main blade. The longitudinal outermost edges of the blades are at the same distance from the center of the hub.

The primary primary blades and secondary secondary blades are axial flow blades, and the secondary primary blades and secondary secondary blades are also axial flow blades.

The first-stage main blade and the first-stage auxiliary blade are mixed-flow blades, and the second-stage main blade and the second-stage auxiliary blade are also mixed-flow blades.

The first-stage main blades and the first-stage auxiliary blades are oblique flow blades, and the second-stage main blades and second-stage auxiliary blades are also oblique flow blades.

The first-stage main blades and the first-stage auxiliary blades are equal-thickness arc plate-shaped blades, and the second-stage main blades and second-stage auxiliary blades are also equal-thickness arc-shaped plate-type blades.

The first-stage main blade and the first-stage auxiliary blade are airfoil-shaped blades, and the second-stage main blade and the second-stage auxiliary blade are also airfoil-shaped blades.

The beneficial effects of the utility model are: adopting the above scheme, due to the two sets of blades, the generated fan pressure is the sum of the two sets of blades’ pressurization of the airflow, and the flow rate of the airflow passing through the impeller remains unchanged; After the blades, that is, the first-stage blade group are pressurized, they enter the second set of blades, that is, the second-stage blade group, for pressurization, so that the airflow remains smooth in the entire fan. By installing two sets of blades on the hub, the pressure of the fan is increased while the flow of the fan remains unchanged, the structure of the fan is simplified, and the structure is compact, the concept is unique, and the design is novel.

Description of drawings

Fig. 1 is a schematic diagram of a high-pressure axial flow fan impeller in a specific embodiment; among the figures 1. hub, 2. primary blade group, 21. primary primary blade, 211. outermost primary primary blade, 22. primary secondary blade , 3. secondary blade group, 31. secondary main blade, 311. secondary main blade outermost, 32. secondary secondary blade.

Detailed ways

Please refer to FIG. 1 , the high-pressure axial flow fan impeller in the figure includes a hub 1 , a first-stage blade set 2 and a second-stage blade set 3 .

The hub 1 forms a conical structure with a wide top and a narrow bottom from top to bottom. The hub 1 is wider in the axial direction than the general axial flow fan impeller hub, and it can be made of iron or alloy materials.

The first-stage blade group 2 is distributed on the upper layer of the hub 1, and the first-stage blade group 2 includes a plurality of primary primary blades 21 and a plurality of primary secondary blades 22, wherein the length of the primary secondary blades 22 is shorter than the length of the primary primary blade 21 ; Each first-level auxiliary blade 22 is distributed between the middle and lower parts of two adjacent first-level main blades 21; the auxiliary blades perform work on the air, thereby reducing the vortex between the connected blades, the more the auxiliary blades, the more the vortex Small.

The secondary blade group 3 is distributed on the lower layer of the hub 1, and the secondary blade group 3 includes a plurality of secondary main blades 31 and a plurality of secondary secondary blades 32, wherein the length of the secondary secondary blades 32 is shorter than the length of the secondary primary blades 31 ; Each secondary blade 32 is distributed between the middle and lower parts of two adjacent secondary main blades 31; similarly, the secondary blades perform work on the air, thereby reducing the vortex between connected blades, the more secondary blades, The vortex is smaller. In order to make the air flow smoothly pass through the primary blade set 2 and the secondary blade set 3, the distance between the outermost edge 211 of the primary primary blade 21 and the center of the hub 1 in the longitudinal direction of the primary primary blade 21 and the longitudinal distance of the secondary primary blade 31 The distance between the outermost edge 311 of the stage main blade and the center of the hub 1 is made to be the same length.

In practical applications, the first-stage main blade 21 and the first-stage auxiliary blade 22 can be axial flow, mixed flow, oblique flow, equal-thickness circular arc plate type or airfoil blade, corresponding; the second-level main blade 31, the second-level auxiliary blade The blade 32 can also be an axial flow, mixed flow, oblique flow, equal-thickness arc plate type or airfoil type blade.

The embodiments of the utility model have been described above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments, and various changes can also be made according to the purpose of the invention of the utility model. Any modifications, equivalent replacements, improvements, etc., should be included within the protection scope of the present utility model.

Claims (6)

1. The impeller of a high-pressure axial flow fan is characterized in that it includes a hub, a first-stage blade set and a second-stage blade set. The hub forms a conical structure from top to bottom with a wide top and a narrow bottom. The first-stage blade group is distributed in the lower layer of the hub, and the first-stage blade group includes multiple first-stage main blades and multiple first-stage auxiliary blades; each first-stage auxiliary blade is distributed between the middle and lower parts of two adjacent first-stage main blades; The blade set includes multiple secondary main blades and multiple secondary secondary blades; each secondary secondary blade is distributed between the middle and lower parts of two adjacent secondary primary blades; the longitudinal outermost edge of the primary primary blade is aligned with the center of the hub The distance is the same as the distance from the longitudinal outermost edge of the secondary main blade to the center of the hub. 2. The high-pressure axial flow fan impeller according to claim 1, characterized in that: the first-level main blades and the first-level auxiliary blades are axial flow blades, and the second-level main blades and second-level auxiliary blades are also axial flow blades . 3. The impeller of a high-pressure axial flow fan according to claim 1, wherein the first-stage main blades and the first-stage auxiliary blades are mixed-flow blades, and the second-stage main blades and second-stage auxiliary blades are also mixed-flow blades. 4. The high-pressure axial flow fan impeller according to claim 1, characterized in that: the first-stage main blades and the first-stage auxiliary blades are oblique flow blades, and the second-stage main blades and second-stage auxiliary blades are also oblique flow blades . 5. The high-pressure axial flow fan impeller according to claim 1, characterized in that: the first-level main blades and the first-level auxiliary blades are arc-shaped blades of equal thickness, and the second-level main blades and second-level auxiliary blades are the same It is an equal-thickness arc plate blade. 6. The high-pressure axial flow fan impeller according to claim 1, characterized in that: the first-level main blade and the first-level auxiliary blade are airfoil blades, and the second-level main blade and the second-level auxiliary blade are also wings type blade.