WO2023093507A1 - Inlet silencer of axial-flow pump - Google Patents

Abstract

An inlet silencer of an axial-flow pump, the inlet silencer comprising an inlet horn section (1), an impeller section (2), a guide vane section (3), an outlet bent pipe section (4), an inlet pipe (5), and a silencer body (6). An upstream end of the inlet horn section (1) is connected to the inlet pipe (5); the silencer body (6) is arranged in the inlet pipe (5); the silencer body (6) comprises a silencer blade (61); one or more silencer blades (61) are provided; and each silencer blade (61) is formed by means of connecting an inlet section (611), a cambered transition section (612), and an outlet section (613) in sequence, wherein the inlet section (611) of the silencer blade (61) is a straight plate and is perpendicular to an incoming flow direction; the cambered transition section (612) of the silencer blade (61) is composed of two curved surfaces, the cambered transition section (612) being bent in an 'S' shape; and the outlet section (613) is a straight plate and is parallel to an outlet liquid flow.

Description

An inlet muffler for an axial flow pump technical field

The invention relates to the technical field of hydraulic fluid machinery design, in particular to an inlet muffler of an axial flow pump.

Background technique

Large-scale low-lift axial flow pumps are widely used in fields such as agricultural irrigation and water diversion projects. During the operation of the axial flow pump, the inlet of the axial flow pump continuously releases noise into the water, and fish may be affected by the noise. Damage to hair cells in the inner ear leads to temporary (temporary threshold shift) or permanent (permanent threshold shift) hearing loss. In severe cases, it may even cause the internal organs of fish to rupture and lead to their death. The damage to fish not only affects the water environment, but also It poses a huge challenge to the protection of endangered aquatic animals. Therefore, aiming at the adverse effects of the noise produced by the operation of the axial flow pump on aquatic animals is a technical problem that needs to be solved urgently at present.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide an inlet muffler for axial flow pumps, which effectively reduces the noise intensity released by traditional axial flow pumps into waters and reduces the damage caused by noise to fish , improving the ecological environment of the water area and benefiting the protection of biodiversity.

In order to achieve the above object, the technical scheme adopted in the present invention is:

An inlet muffler for an axial flow pump, which includes an inlet horn section, an impeller section, a guide vane section, an outlet elbow section, an inlet pipe, a muffler, an inlet horn section, an impeller section, a guide vane section, and an outlet elbow section along the The fluid directions are connected sequentially. The upstream end of the inlet horn section is connected to an inlet pipe, and a muffler is arranged inside the inlet pipe. The feature is that the muffler includes muffler blades, and the muffler blades are single blades or multiple blades.

Further, the muffler blade is composed of an inlet section, an arc-shaped transition section and an outlet section connected in sequence. The inlet section of the muffler blade is a straight plate and is perpendicular to the direction of the incoming flow, and the arc-shaped transition section of the muffler blade is two sections. Curved surface, the arc transition section is "S" curved, and the outlet section is a straight plate parallel to the outlet flow.

Further, the muffler blade is developed in a certain circumferential section, the blade section is center-symmetrical about the origin O and the muffler blade is a blade of equal thickness, and the slope angle a of the arc transition section at the origin O is a=30-60° .

Further, the lateral length of the muffler blade in a certain circumferential cross-section development is L, and the axial length of the circumferential cross-section development is H. For a single-blade muffler, L/H=0.42-0.62; for a multi-blade muffler device, L/H=0.72-0.92.

Further, the muffler includes a plurality of muffler blades and a hub, the plurality of muffler blades are evenly arranged on the outer circumference of the hub, and the upstream end of the hub is provided with a first guide part, the first guide part is an arc-shaped guide Flow part, the downstream end of the hub is provided with a second guide part, the second guide part includes a tapered part and an arc part, the arc part is located at the downstream end of the tapered part, and the outer peripheral surface of the second guide part is arranged on A plurality of grooves, the plurality of grooves are evenly or unevenly distributed on the outer peripheral surface of the second flow guiding part, and the grooves are circular grooves.

Further, the radial inner edge or radial root of the muffler blade is provided with a plurality of communication holes, and the plurality of communication holes communicate with the two sides of the muffler blade respectively; the plurality of communication holes are distributed along the length direction of the muffler blade, The communication holes are generally rectangular or semicircular communication holes.

Further, the outer diameter Dh of the hub is 1/5-1/3 of the outer diameter Ds of the muffler blade.

Further, for the multi-vane muffler, the number of blades of the muffler is 3-4.

Beneficial effect:

An inlet muffler of an axial flow pump of the present invention, the muffler blade is composed of an inlet section, an arc-shaped transition section and an outlet section connected in sequence, which can not only ensure the overall performance of the axial flow pump, but also ensure a good noise reduction effect. The present invention can effectively reduce the noise in the transition water flow area between the muffler blade and the inlet horn section through the design of the second guide part and multiple grooves, and the multiple grooves have a certain effect of noise reflection or diffusion on the noise inhibition. The present invention can balance or reduce pressure fluctuations on both sides of the blade through the design of a plurality of communication holes, thereby reducing noise generated by pressure fluctuations.

The inlet muffler of an axial flow pump of the present invention can effectively suppress the noise generated in the impeller from propagating from the axial flow pump to the water area, greatly reducing the impact of noise on fish, The imported silencer is of great significance to the protection of aquatic organisms and the ecological environment.

Description of drawings

Fig. 1 is the single vane structure schematic diagram of the inlet muffler of the axial flow pump of the present invention;

Fig. 2 is a multi-blade structure schematic diagram of the inlet muffler of the axial flow pump of the present invention;

Fig. 3 is a schematic diagram of the expansion of the circumferential section of the blade of the single-blade muffler of the present invention;

Fig. 4 is a schematic diagram of the expansion of the circumference section of the blades of the multi-blade muffler of the present invention;

Fig. 5 is a structural schematic diagram of another embodiment of the multi-blade muffler of the axial flow pump of the present invention;

Fig. 6 is a structural schematic diagram of a single-vane muffler of an axial flow pump of the present invention;

Fig. 7 is a schematic structural diagram of a three-dimensional model of a single-blade muffler of an axial flow pump of the present invention;

Fig. 8 is a structural schematic diagram of a three-dimensional model of a multi-vane muffler of an axial flow pump of the present invention.

In the figure: inlet horn section 1, impeller section 2, guide vane section 3, outlet elbow section 4, inlet pipe 5, muffler 6, blade 61, hub 62, first guide part 63, second guide part 64 , Groove 65, communication hole 66, inlet section 611, arc transition section 612, outlet section 613.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

As shown in Figure 1-8, an inlet muffler of an axial flow pump includes an inlet horn section 1, an impeller section 2, a guide vane section 3, an outlet elbow section 4, an inlet pipe 5, a muffler 6, and an inlet horn section 1. The impeller section 2, the guide vane section 3, and the outlet elbow section 4 are connected sequentially along the fluid direction. The upstream end of the inlet horn section 1 is connected to the inlet pipe 5, and the inlet pipe 5 is provided with a muffler 6. The muffler 6 includes a muffler The device blade 61, the muffler blade 61 is a single blade or multiple blades.

As shown in Figure 3-4, the single-vane inlet muffler is composed of an inlet section 611, an arc-shaped transition section 612 and an outlet section 613 connected in sequence. The inlet section 611 of the muffler blade 61 is a straight plate and perpendicular to the direction of the incoming flow, which mainly plays the role of guiding the liquid flow into the muffler; the arc transition section 612 of the muffler blade 61 is a two-section curved surface, which mainly plays the role of reflecting noise and increasing The effect of noise loss along the way ultimately reduces the noise at the inlet of the axial flow pump.

The parameters of the blade will be described below with an expanded view of a certain circumferential section of the single-blade muffler blade 61 . The blade inlet section 611 is a straight plate and parallel to the inlet liquid flow, which is to introduce the liquid flow into the blade; the arc-shaped transition section 612 is curved in an S shape, which is to better prevent the noise generated in the impeller from passing through the muffler And spread. In addition, the slope of the arc transition section at the origin O should not be too small. Although a too small slope can better reflect the noise generated in the impeller and have a better noise reduction effect, it will have a negative impact on the performance of the axial flow pump. Adverse effects, if the slope is too small, the liquid flow will separate in the arc transition section and form a vortex, which will eventually lead to a decrease in the efficiency of the axial flow pump; the slope of the arc transition section 612 at the origin O should not be too large, too large Although the slope has little effect on the performance of the axial flow pump, the sound attenuation effect will be drastically reduced. Therefore, the slope angle a of the transition section at the origin is optimal at 30°-60°, which can not only ensure the overall performance of the axial flow pump, but also ensure a good noise reduction effect. The outlet section 613 of the blade is a straight plate parallel to the outlet liquid flow, which is to better introduce the liquid flow to the impeller inlet; the outlet section 613 is a straight plate, which mainly introduces the liquid flow in the muffler vertically to the impeller inlet In addition, the straight plate also has the function of eliminating the pre-swirl of the impeller inlet, so it can improve the overall performance of the axial flow pump, that is, to a certain extent, the lift and efficiency of the axial flow pump are improved, and the tendency of the saddle area of the axial flow pump is effectively alleviated.

In addition, in order to ensure the noise reduction effect in all directions of the circumference, the transverse length of the expanded view of the circumferential section of the muffler blade 61 is L, so that the single-blade muffler can reflect the noise generated in the impeller in the circumferential direction; the expanded view of the circumferential section of the blade The axial length of H is H, and H should not be too large. Excessive axial size will increase the size of the silencer, thereby increasing the overall size of the axial flow pump, thereby increasing the production cost of the axial flow pump. For the single-vane muffler, preferably, L/H=0.42-0.62, preferably, L/H=0.5-0.55.

In the following, various parameters of the blades will be described with the expansion diagram of a certain circumferential cross-section of the multi-blade muffler blade 61 . The inlet section 612 of the muffler blade 61 is a straight plate parallel to the inlet liquid flow, which is for introducing the liquid flow into the blade. The arc transition section 612 is curved in an S shape, which is to better prevent the noise generated in the impeller from passing through the muffler. In addition, the slope of the arc transition section at the origin O should not be too small. Although a too small slope can better reflect the noise generated in the impeller and have a better noise reduction effect, it will have a negative impact on the performance of the axial flow pump. Adverse effects, if the slope is too small, it will cause flow separation in the transition section and form a vortex, which will eventually lead to a decrease in the efficiency of the axial flow pump; the slope of the transition section at the origin should not be too large. The performance of the pump will be less affected, but the sound deadening effect will be drastically reduced. Therefore, the slope angle a of the arc transition section at the origin O is optimal at 30°-60°, which can not only ensure the overall performance of the axial flow pump, but also ensure a good noise reduction effect. The blade outlet section 613 is a straight plate parallel to the outlet liquid flow, which is to better introduce the liquid flow to the impeller inlet; the outlet section 613 is a straight plate, which mainly introduces the liquid flow in the muffler vertically to the impeller inlet In addition, the straight plate also has the function of eliminating the pre-swirl of the impeller inlet, so it can improve the overall performance of the axial flow pump, that is, to a certain extent, the head and efficiency of the axial flow pump are improved, and the tendency of the saddle area of the axial flow pump is effectively alleviated.

In addition, in order to ensure the sound attenuation effect in all directions of the circumference, the transverse length of the expanded view of the circular section of the blade is L1 (L), and the product of L1 and the number of blades Z is equal to the circumference of the section. The noise generated in the impeller is reflected for better sound attenuation. The axial length H1(H) of the expanded view of the circular cross-section of the muffler blade 61 should not be too large. An excessively large axial dimension will increase the size of the muffler, thereby increasing the overall size of the axial flow pump, thereby increasing the axial flow pump. Cost of production. For the multi-blade muffler, preferably, L/H=0.72-0.92, preferably, L/H=0.75-0.85.

The more blades of the multi-blade muffler, the smaller the size of the muffler, but the greater the energy loss when the liquid flow passes through the muffler, so in order to ensure that the axial flow pump has both good efficiency and good silencing effect, the muffler blades 61 is the best when the number of leaves is 3-4.

As shown in Figure 5, in a preferred embodiment, the muffler 6 includes a plurality of muffler blades 61 and a hub 62, and a plurality of muffler blades 61 are evenly arranged on the periphery of the hub 62, and the upstream end of the hub 62 is provided with a first The guide part 63, the first guide part 63 is a circular arc guide part, the downstream end of the hub 62 is provided with a second guide part 64, the second guide part 64 includes a tapered part and an arc part, the arc Located at the downstream end of the tapered part, the outer peripheral surface of the second guide part 64 is arranged on a plurality of grooves 65, and the plurality of grooves 65 are evenly or unevenly distributed on the outer peripheral surface of the second guide part 64, and the grooves 65 is a circular groove.

The present invention can effectively reduce the noise in the transition water flow area between the muffler blade 61 and the inlet horn section 1 through the design of the second guide part 64 and a plurality of grooves 65, and the plurality of grooves 65 have a certain effect on noise. Inhibition of noise reflection or diffusion.

Further, the radially inner edge or radial root of the muffler blade 61 is provided with a plurality of communication holes 66, and the plurality of communication holes 66 communicate with the two sides of the muffler blade 61 respectively; Distributed along the length direction, the communication holes 66 are generally rectangular or semicircular communication holes. The present invention can balance or reduce the pressure fluctuations on both sides of the blade 61 through the design of the plurality of communication holes 66, thereby reducing the noise generated by the pressure fluctuations.

Further, in order to ensure the structural strength of the muffler blade 61, the outer diameter Dh of the hub 62 is 1/5-1/3 of the outer diameter Ds of the muffler blade 61. An excessively large hub diameter will block the inlet liquid flow, and excessive A small hub diameter will greatly reduce the structural strength of the muffler blade.

An inlet muffler of an axial flow pump according to the present invention, the muffler blade 61 is composed of an inlet section 611, an arc transition section 612 and an outlet section 613 connected in sequence, which can not only ensure the overall performance of the axial flow pump, but also ensure good Noise reduction effect. The present invention can effectively reduce the noise in the transition water flow area between the muffler blade 61 and the inlet horn section 1 through the design of the second guide part 64 and a plurality of grooves 65, and the plurality of grooves 65 have a certain effect on noise. Inhibition of noise reflection or diffusion. The present invention can balance or reduce the pressure fluctuations on both sides of the blade 61 through the design of the plurality of communication holes 66, thereby reducing the noise generated by the pressure fluctuations.

The inlet muffler of an axial flow pump of the present invention can effectively suppress the noise generated in the impeller from propagating from the axial flow pump to the water area, greatly reducing the impact of noise on fish, The imported silencer is of great significance to the protection of aquatic organisms and the ecological environment.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limitations to the present invention. Variations, modifications, substitutions, and modifications to the above-described embodiments are possible within the scope of the present invention.

Claims (8)

1. An inlet muffler for an axial flow pump, which includes an inlet horn section (1), an impeller section (2), a guide vane section (3), an outlet elbow section (4), an inlet pipe (5), and a muffler (6 ), the inlet horn section (1), the impeller section (2), the guide vane section (3), and the outlet elbow section (4) are sequentially connected along the fluid direction, and the upstream end of the inlet horn section (1) is connected with an inlet pipe (5 ), the inlet pipe (5) is provided with a muffler (6), characterized in that: the muffler (6) includes muffler blades (61), and the muffler blades (61) are single blades or multiple blades.
2. The inlet muffler of an axial flow pump according to claim 1, characterized in that, the muffler blade (61) consists of an inlet section (611), an arc transition section (612) and an outlet section (613) in sequence The inlet section (611) is a straight plate and perpendicular to the direction of the incoming flow, the arc transition section (612) is two curved surfaces, the arc transition section (612) is curved in an "S" shape, and the outlet section (613) is A straight section parallel to the outlet flow.
3. The inlet muffler of an axial flow pump according to claim 2, wherein the muffler blade (61) in a certain circumferential cross-sectional development view, the blade section is symmetrical about the center of the origin O and the muffler blade is For equal-thickness blades, the slope angle a of the arc transition section (612) at the origin O is 30-60°.
4. The inlet muffler of an axial flow pump according to claim 3, characterized in that, the lateral length of the muffler blade (61) in a certain circumferential cross-sectional development view is L, and the axial length of the circumferential cross-sectional development view is It is H, for single blade muffler, L/H=0.42-0.62; for multi-blade muffler, L/H=0.72-0.92.
5. The inlet muffler of an axial flow pump according to any one of claims 2 or 4, characterized in that, the muffler (6) comprises a plurality of muffler blades (61), a hub (62), a plurality of The muffler blades (61) are evenly arranged on the outer circumference of the hub, and the upstream end of the hub is provided with a first guide part (63), the first guide part (63) is an arc-shaped guide part, and the hub (62) The downstream end of the downstream end is provided with a second guide part (64), and the second guide part (64) comprises a tapered part and an arc part, and the arc part is positioned at the downstream end of the tapered part, and the second guide part (64) The outer peripheral surface of the second flow guiding part (64) is arranged on a plurality of grooves (65), and a plurality of said grooves (65) are evenly or unevenly distributed on the outer peripheral surface of the second flow guiding part (64), and the groove (65) is a circular concave groove.
6. The inlet muffler of an axial flow pump according to claim 5, characterized in that, the radial inner edge or radial root of the muffler blade (61) is provided with a plurality of communication holes (66), and a plurality of The communication holes (66) communicate with the two sides of the muffler blade (61) respectively; a plurality of communication holes (66) are distributed along the length direction of the muffler blade (61), and the communication holes (66) are rectangular or semicircular and communicate with each other. hole.
7. The inlet muffler of an axial flow pump according to claim 6, characterized in that the outer diameter Dh of the hub (62) is 1/5-1/3 of the outer diameter Ds of the muffler blade (61).
8. The inlet muffler of an axial flow pump according to claim 7, characterized in that, for a multi-vane muffler, the number of muffler blades (61) is 3-4.

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