Pneumatic extinguisher impeller with novel three-dimensional structure blades

Abstract

The utility model discloses a pneumatic extinguisher impeller with novel three-dimensional structure blades, relates to the technical field of pneumatic extinguishers, and solves the problems that the original impeller blade configuration and volute structure cause certain loss of internal gas flow, the gas flow rate at an outlet is influenced, and the gas flow rate is influenced. The backpack type pneumatic extinguisher comprises an impeller body, arc-shaped blades are arranged in the impeller body, through holes are formed in the positions, between the blades, of the impeller body, the size parameters of the blades of the impeller are improved, and the size parameters comprise the size on the horizontal plane and the size perpendicular to the plane of the impeller; the geometric configuration of the impeller blade is improved, and the geometric parameters of the impeller blade and the volute are integrally optimized; the energy loss caused by gas flowing in the pneumatic extinguisher is improved, and the working efficiency of the impeller of the pneumatic extinguisher is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of wind-powered fire extinguishers, and in particular to a wind-powered fire extinguisher impeller with a novel three-dimensional structure blade. Background Technology

[0002] The impeller is a crucial component that determines the performance and efficiency of a wind-powered fire extinguisher. Backpack-type wind-powered fire extinguishers use a gasoline engine to drive the impeller to rotate inside the volute, generating a high-pressure airflow to extinguish the fire. However, the original impeller blade configuration and volute structure cause some loss in the internal gas flow, affecting the gas velocity at the outlet and reducing the working efficiency of the backpack-type wind-powered fire extinguisher. Utility Model Content

[0003] In view of the problem that the original impeller blade configuration and volute structure cause certain losses in internal gas flow, affecting the gas flow velocity at the outlet and reducing the working efficiency of the backpack wind-powered fire extinguisher, the purpose of this utility model is to provide a wind-powered fire extinguisher impeller with a new three-dimensional structure blade.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A wind-powered fire extinguisher impeller with a novel three-dimensional structure blade includes: an impeller body 1 and blades 2. Multiple blades 2 are connected inside the impeller body 1. The multiple blades 2 are of the same specification and are arranged at equal intervals around the axis of the impeller body 1.

[0006] Each blade 2 is a plate-like structure made up of multiple segments of curved plates and flat plates with varying diameters. The inner side lines of multiple blades 2 are linear structures made up of multiple segments of curved lines, straight lines and stepped lines with varying diameters.

[0007] The multiple blades 2 arranged around the axis of the impeller body 1 have the same bending direction, all facing either clockwise or counterclockwise.

[0008] The aforementioned wind-powered fire extinguisher impeller with novel three-dimensional structure blades includes an impeller body 1 comprising an inner side plate 101, a connecting plate 102, and an outer side plate 103. The inner side plate 101 is an annular plate, and the inner side plate 101 and the outer side plate 103 are coaxially arranged. Multiple connecting plates 102 are connected between the inner side plate 101 and the outer side plate 103. The multiple connecting plates 102 are of the same specification and are arranged at equal intervals around the axis of the inner side plate 101.

[0009] The aforementioned wind-powered fire extinguisher impeller with novel three-dimensional structure blades has multiple connecting plates 102 that are all arc-shaped and have the same bending direction as the multiple blades 2.

[0010] In the aforementioned wind-powered fire extinguisher impeller with novel three-dimensional structure blades, any one of the connecting plates 102 is located between two adjacent blades 2.

[0011] The aforementioned wind-powered fire extinguisher impeller with novel three-dimensional structure blades has multiple through holes 3 along the circumferential direction on the outer side plate 103, with any one through hole located between two adjacent blades 2.

[0012] The aforementioned wind-powered fire extinguisher impeller with novel three-dimensional structure blades includes an impeller body 1 further comprising a cylinder 104, which is coaxially arranged with an inner side plate 101, and the outer edge of the end of the cylinder 104 is connected to the inner edge of the inner side plate 101.

[0013] The aforementioned wind-powered fire extinguisher impeller with novel three-dimensional structure blades includes blade 2 comprising: a first arc-shaped blade segment 201, a second arc-shaped blade segment 202, and a third arc-shaped blade segment 203. The first arc-shaped blade segment 201, the second arc-shaped blade segment 202, and the third arc-shaped blade segment 203 are connected sequentially. The inner edges of the first arc-shaped blade segment 201, the second arc-shaped blade segment 202, and the third arc-shaped blade segment 203 are all connected to the outer edge plate 103. The inner edge of the third arc-shaped blade segment 203 is connected to the inner edge plate 101. The end of the first arc-shaped blade segment 201 away from the second arc-shaped blade segment 202 is positioned close to the center of the outer edge plate 103. The end of the third arc-shaped blade segment 203 away from the second arc-shaped blade segment 202 is positioned close to the edge of the outer edge plate 103.

[0014] The aforementioned wind-powered fire extinguisher impeller with novel three-dimensional structure blades, wherein the first segment 201 of the arc-shaped blade is a flat plate, and the angle between the tangent line at the end of the first segment 201 of the arc-shaped blade away from the second segment 202 on the outer side plate 103 and the plane where the first segment 201 of the arc-shaped blade is located, i.e., the blade inlet angle A01, ranges from 172° to 187°.

[0015] The aforementioned wind-powered fire extinguisher impeller with novel three-dimensional structure blades, wherein the angle between the tangent at the end of the third segment 203 of the arc-shaped blade away from the second segment 202 on the outer side plate 103 and the end, i.e. the blade outlet angle A02, ranges from 125° to 137°.

[0016] The aforementioned wind-powered fire extinguisher impeller with novel three-dimensional structure blades has the following features: the inner side of the first segment 201 of the arc-shaped blade has a straight line segment, meaning the blade inlet length L01 ranges from 5mm to 20mm; the inner side of the third segment 203 of the arc-shaped blade has a stepped line height variation, meaning the blade root cutting dimension L02 ranges from 1mm to 16mm.

[0017] Because this utility model employs the aforementioned technology, it has the following positive effects compared to existing technologies:

[0018] (1) This utility model improves the size parameters of the impeller blades, including the dimensions on the horizontal plane and the dimensions perpendicular to the impeller plane; improves the geometric configuration of the impeller blades, and performs integrated optimization of the geometric parameters of the impeller blades and the volute; improves the energy loss of the gas flow inside the wind-powered fire extinguisher, and improves the working efficiency of the wind-powered fire extinguisher impeller.

[0019] (2) By changing the size parameters of the impeller blades in the volute in the radial and axial dimensions, this utility model reduces the loss in the gas flow process and the leakage loss between the blades and the volute, accelerates the gas flow speed in the pipe of the wind-powered fire extinguisher, reduces the input power required by the impeller at the same speed, and increases the outlet total pressure and flow velocity, thereby improving the working efficiency of the impeller of the wind-powered fire extinguisher. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a wind-powered fire extinguisher impeller with a novel three-dimensional structure blade according to this utility model.

[0021] Figure 2 This is a front view of a wind-powered fire extinguisher impeller with a novel three-dimensional structure blade, according to this utility model.

[0022] Figure 3 This is an axial sectional view of a wind-powered fire extinguisher impeller with a novel three-dimensional structure blade according to the present invention.

[0023] Figure 4 This is a schematic diagram of the axial cross-sectional dimensions of a wind-powered fire extinguisher impeller with a novel three-dimensional structure blade according to the present invention.

[0024] Figure 5 This is a radial sectional view of a wind-powered fire extinguisher impeller with a novel three-dimensional structure blade, according to the present invention.

[0025] In the attached diagram: 1. Impeller body; 2. Blade; 3. Through hole; 101. Inner side plate; 102. Connecting plate; 103. Outer side plate; 104. Cylinder; 201. First section of arc-shaped blade; 202. Second section of arc-shaped blade; 203. Third section of arc-shaped blade. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0027] Please refer to Figures 1 to 5The diagram illustrates a wind-powered fire extinguisher impeller with novel three-dimensional blade structures. It includes an impeller body 1, with arc-shaped blades 2 disposed inside the impeller body 1, and through holes 3 formed in the gaps between the blades 2. This invention, through the design and use of the arc-shaped blades 2, reduces gas flow losses and leakage between the blades 2 and the volute by altering the radial and axial dimensional parameters of the blades 2. This accelerates the gas flow velocity within the wind-powered fire extinguisher tube, improves the airflow velocity distribution within the tube, reduces the required input power of the impeller at the same rotational speed, while increasing the outlet total pressure and flow velocity, thus improving the impeller's working efficiency.

[0028] Furthermore, in a preferred embodiment, blades 2 are provided on the impeller body 1, and through holes 3 are provided on the impeller body 1 between the blades 2. The impeller body 1 is provided with arc-shaped blades 2, the outer curve of which is an arc shape composed of multiple tangent arc segments. The projections of the arc-shaped blades 2 on both the axial and radial sections of the impeller are composed of segmented arc splices. Through holes 3 are provided at the bottom of the impeller body 1 for connecting the impeller and the volute.

[0029] Furthermore, in a preferred embodiment, the impeller blade 2 is optimized at the three-dimensional structural level. The radial and axial design parameters of the impeller blade 2 are variable parameters. During the optimization design of the impeller blade 2, the axial and radial dimensional parameters of the impeller blade 2 are analyzed, designed, and optimized simultaneously.

[0030] Furthermore, in a preferred embodiment, the impeller blade 2 is integrally formed by additive manufacturing.

[0031] Furthermore, in a preferred embodiment, the impeller is integrally formed by additive manufacturing.

[0032] Preferably, the blade 2 has an outer curve that is an arc shape formed by multiple tangent arcs spliced ​​together. The arc-shaped blade 2 can be regarded as being formed by tangent splicing of L01, R01 and R02 in the axial section of the impeller, and can be regarded as being formed by splicing of line segment L03, arc R03 and R04 in the radial section. The entire blade 2 is composed of segmented arc splicing. A through hole 3 is provided at the bottom of the impeller body 1. The through hole 3 is used to connect the impeller and the volute.

[0033] Preferably, the impeller blade 2 is optimized in three-dimensional structure. The geometric configuration of the impeller blade 2 and the volute configuration are integrated and optimized as a whole. The impeller blade 2 is a new type of optimized size structure.

[0034] Preferably, the axial design parameters of the impeller blade 2 include, but are not limited to, the inlet angle A01, the outlet angle A02, and the length of line segment 1 L01.

[0035] Preferably, the radial design parameters of the impeller blade 2 include, but are not limited to, the blade root clearance L02.

[0036] Preferably, a four-factor, four-level orthogonal experiment is constructed based on the dimensional parameters selected in the axial and radial directions for research. Subsequently, the Taguchi robust design method and the generalized additive model are combined to optimize the design of the impeller blades of the portable wind-powered fire extinguisher with the outlet air volume as the target.

[0037] Compared with the prior art, the beneficial effects of this utility model are:

[0038] The dimensional parameters of the impeller blade 2 were improved, including the dimensions on the horizontal plane and the dimensions perpendicular to the impeller plane; the geometric configuration of the impeller blade 2 was improved, and the geometric parameters of the impeller blade 2 and the volute were optimized as a whole; the energy loss of the gas flow inside the wind-powered fire extinguisher was improved, and the working efficiency of the wind-powered fire extinguisher impeller 2 was increased.

[0039] This design reduces gas flow losses and leakage between the blades and the volute by changing the dimensional parameters of the impeller blades in the radial and axial dimensions. This accelerates the gas flow velocity in the pipe of the wind-powered fire extinguisher, reduces the required input power of the impeller at the same rotational speed, and increases the outlet total pressure and flow velocity, thereby improving the working efficiency of the wind-powered fire extinguisher impeller.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention.

[0041] Based on the above, this utility model also has the following embodiments:

[0042] In further embodiments of this utility model, please refer to Figure 1 , 2 4, 5, This utility model provides a technical solution: a novel three-dimensional structure blade wind-powered fire extinguisher impeller, including an impeller body 1, an arc-shaped blade 2 disposed inside the impeller body, and through holes 3 disposed on the impeller body between the blades. The blade's outer curve is an arc shape formed by multiple tangent arc segments spliced ​​together. The arc-shaped blade can be regarded as being formed by tangent splicing of L01, R01, and R02 in the axial section of the impeller, and can be regarded as being formed by splicing of line segment L03, arc R03, and R04 in the radial section. The entire blade is composed of segmented arc splicing.

[0043] This invention utilizes the Taguchi robust design method and an improved generalized additive model to optimize four selected dimensional parameters of the impeller blades, thereby improving the outlet flow rate and operational performance of the wind-powered fire extinguisher. Based on the selected four parameters, this invention employs a four-factor, four-level orthogonal experimental design. Range analysis is used to analyze the simulated orthogonal experimental results, and a generalized additive model considering parameter interactions is used for predictive analysis to determine the optimal combination of parameter levels.

[0044] This invention employs an additive manufacturing process for integral molding. Resin printing material is selected to ensure the structural stability of the impeller body during operation. 3D printing technology is used to manufacture the impeller body to ensure that the impeller blades have the same structural dimensional parameters as the design results, while improving production efficiency.

[0045] The following are the performance comparison results between the impeller using the novel three-dimensional structure blades and the prototype:

[0046] Table 1 Comparison of design parameters and performance of wind-powered fire extinguishers before and after optimization

[0047]

[0048]

[0049] Optimization principle: In the optimization design, this utility model optimizes the dimensional parameters of the impeller blade 2 in two reference planes, axial and radial. In the two reference planes, the outline of the impeller blade 2 is standardized into an arc-shaped outline composed of several tangent and connected arcs. By selecting characteristic dimensions in both the axial and radial directions and carrying out joint analysis, the dimensional optimization of the impeller blade 2 is completed, which improves the working efficiency of the wind-powered fire extinguisher impeller 1.

[0050] The following is an example of a four-factor, four-level orthogonal array constructed using the Taguchi analysis method:

[0051] Table 2 Parameter Selection and Horizontal Settings

[0052]

[0053] This invention uses the signal-to-noise ratio (S / N ratio) instead of the mass loss function in the Taguchi robust design method. A higher S / N ratio indicates better performance of the wind-powered fire extinguisher; therefore, the S / N ratio with high visibility characteristics is used as a benchmark. After obtaining the S / N ratio for each parameter level, a generalized additive model (GAM) is used to predict the nonlinear relationship between the outlet flow rate and different impeller blade size parameters. Since the multiple impeller blade size parameters interact with each other on the wind-powered fire extinguisher's efficiency, this invention adds interaction terms to the original GAM nonlinear expression to improve the model's prediction results, ultimately obtaining the optimal parameter combination.

[0054] Working principle: During operation, the gasoline engine drives the impeller 1 to rotate at high speed, generating high-speed gas flow in the volute. Outside air is drawn in through negative pressure and accelerated by the rotation of the blades 2 before flowing out through the ventilation duct. By changing the dimensional parameters of the impeller blades 2, the gas flow velocity in the impeller 1, as well as the total pressure and wind speed at the outlet of the wind-powered fire extinguisher, are increased, effectively improving the working efficiency of the impeller.

[0055] The blade inlet angle A01, blade outlet angle A02, blade inlet length L01, and blade root cutting size L02 need to be selected within the range. R01, R02, R03, and R04 can be automatically fitted based on the selected blade inlet angle A01, blade outlet angle A02, blade inlet length L01, and blade root cutting size L02.

[0056] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wind-powered fire extinguisher impeller with novel three-dimensional structured blades, characterized in that, include: Impeller body (1) and blades (2), multiple blades (2) are connected inside the impeller body (1), and the multiple blades (2) are of the same specification and are arranged at equal intervals around the axis of the impeller body (1); Each blade (2) is a plate-shaped structure made up of multiple segments of curved plate and flat plate with varying diameters. The inner side lines of multiple blades (2) are linear structures made up of multiple segments of curved line, straight line and stepped line. Multiple blades (2) arranged around the axis of the impeller body (1) have the same bending direction, all facing clockwise or counterclockwise.

2. The wind-powered fire extinguisher impeller with novel three-dimensional structure blades according to claim 1, characterized in that, The impeller body (1) includes: an inner plate (101), a connecting plate (102) and an outer plate (103). The inner plate (101) is an annular plate. The inner plate (101) and the outer plate (103) are coaxially arranged. Multiple connecting plates (102) are connected between the inner plate (101) and the outer plate (103). The multiple connecting plates (102) have the same specifications and are arranged at equal intervals around the axis of the inner plate (101).

3. The wind-powered fire extinguisher impeller with novel three-dimensional structure blades according to claim 2, characterized in that, Multiple connecting plates (102) are all arc-shaped plates and have the same bending direction as multiple blades (2).

4. The wind-powered fire extinguisher impeller with novel three-dimensional structure blades according to claim 3, characterized in that, Any connecting plate (102) is located between two adjacent blades (2).

5. The wind-powered fire extinguisher impeller with novel three-dimensional structure blades according to claim 4, characterized in that, Multiple through holes (3) are provided on the outer side plate (103) along the circumferential direction, and any one of the through holes is located between two adjacent blades (2).

6. The wind-powered fire extinguisher impeller with novel three-dimensional structure blades according to claim 2, characterized in that, The impeller body (1) also includes a cylinder (104), which is coaxially arranged with the inner side plate (101), and the outer edge of the end of the cylinder (104) is connected to the inner edge of the inner side plate (101).

7. The wind-powered fire extinguisher impeller with novel three-dimensional structure blades according to claim 2, characterized in that, The blade (2) includes: a first arc-shaped blade segment (201), a second arc-shaped blade segment (202), and a third arc-shaped blade segment (203). The first arc-shaped blade segment (201), the second arc-shaped blade segment (202), and the third arc-shaped blade segment (203) are connected in sequence. The inner side lines of the first arc-shaped blade segment (201), the second arc-shaped blade segment (202), and the third arc-shaped blade segment (203) are all connected to the outer side plate (103). The inner side line of the third arc-shaped blade segment (203) is connected to the inner side plate (101). The end of the first arc-shaped blade segment (201) away from the second arc-shaped blade segment (202) is located near the center of the outer side plate (103). The end of the third arc-shaped blade segment (203) away from the second arc-shaped blade segment (202) is located near the edge of the outer side plate (103).

8. The wind-powered fire extinguisher impeller with novel three-dimensional structure blades according to claim 7, characterized in that, The first segment (201) of the arc blade is a flat plate. The angle between the tangent line on the circumference of the end of the first segment (201) of the arc blade away from the second segment (202) of the arc blade at the outer plate (103) and the plane where the first segment (201) of the arc blade is located, i.e., the blade inlet angle A01, is in the range of 172° to 187°.

9. The wind-powered fire extinguisher impeller with novel three-dimensional structure blades according to claim 7, characterized in that, The angle between the tangent at the end of the third segment (203) of the arc-shaped blade away from the second segment (202) on the outer side plate (103) and the end, i.e. the blade exit angle A02, ranges from 125° to 137°.

10. The wind-powered fire extinguisher impeller with novel three-dimensional structure blades according to claim 7, characterized in that, The inner side of the first segment (201) of the arc blade has a straight line segment, that is, the blade inlet length L01 ranges from 5mm to 20mm; the inner side of the third segment (203) of the arc blade has a stepped line height variation, that is, the blade root cutting size L02 ranges from 1mm to 16mm.

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