A double-suction pump with a voltage-stabilizing circuit

Abstract

A double-suction pump with a voltage-stabilizing circuit according to the present invention is provided with a first horizontal flow passage and a first arc-shaped flow passage communicating in sequence inside the rear cover plate of the first impeller, a second horizontal flow passage and a second arc-shaped flow passage communicating in sequence inside the rear cover plate of the second impeller, a vertical flow passage is arranged inside the outlet guide vane, the first arc-shaped flow passage and the second arc-shaped flow passage converge at the end of the flow passage and are communicated with the inlet of the vertical flow passage; a "Y"-shaped deflector is arranged at the outlet end of the vertical flow passage, and a conical deflector is arranged at the inner side position of the upper volute and the lower volute corresponding to the "Y"-shaped deflector; a return passage is arranged in the volute section corresponding to the inlet sealing structure and the outlet sealing structure. Due to the improvement of the double-suction pump structure, the flow characteristics are improved, the guiding efficiency is enhanced, and the vibration and noise are reduced.

Description

Technical Field

[0001] The present invention relates to a double-suction pump with a voltage stabilizing circuit, and in particular to a double-suction pump structure that can improve the diversion efficiency, reduce vibration and noise. Background Art

[0002] The double-suction pump is a common type of centrifugal pump, which has the characteristics of high head and large flow rate. It is especially suitable for occasions such as water plants, paper mills, power plants, steel mills, chemical plants, water conservancy projects, and irrigation area water supply. It has excellent cavitation performance; the structure is symmetrical, the axial force during operation is very small, the operation is stable, and the reliability is strong; the structure is compact, the floor area is small, and the maintenance is convenient. At present, the double-suction pump has been improved by more and more researchers. However, the existing double-suction pumps generally have low diversion efficiency, large vibration and high noise. Therefore, it is particularly important to carry out design and research on the improvement of the characteristics of the double-suction pump.

[0003] The prior art CN115853819A discloses a horizontal double-suction centrifugal pump supported by a water guide bearing, which adopts a water guide bearing structure with an internal attached polymer material, and conducts cooling and lubrication by introducing water from the pump cavity. Compared with the traditional double-suction pump using thin oil or grease lubrication, it not only simplifies the bearing structure and the cooling and lubrication method, but also reduces the installation and maintenance costs. Installing the bearing component at the throat of the pump body and pump cover greatly shortens the bearing span, and improves the operation stability and reliability of the single-stage double-suction horizontal split-case centrifugal pump. Compared with the traditional single-stage double-suction horizontal split-case centrifugal pump, in the present invention, the bearing component is installed at the throat of the pump body and pump cover, so there is no need to set a shaft seal (packing or mechanical seal) structure at the non-driving end, and only the O-ring static seal can meet the sealing requirements. This further simplifies the structure, reduces the number of vulnerable parts, shortens the total length of the pump shaft, and improves the strength of the pump shaft.

[0004] However, the above double-suction centrifugal pumps all have limitations in design, poor adaptability, large power consumption, unstable water output, low efficiency, large vibration and high noise. Therefore, in view of these problems, the applicant proposes a double-suction pump with a voltage stabilizing circuit to solve the above-mentioned problems to improve the flow characteristics, enhance the diversion efficiency, reduce vibration and noise. Summary of the Invention

[0005] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a double-suction pump with a voltage stabilizing circuit.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A double-suction pump with a voltage-stabilizing circuit, comprising an upper volute, a lower volute, an impeller, a bearing, a mechanical seal, and a main shaft. The impeller includes an impeller front cover plate, an impeller rear cover plate, a hub, and blades. The blades are located in the space enclosed by the impeller front cover plate, the impeller rear cover plate, and the hub. It is characterized in that: adjacent impeller rear cover plates include a first impeller rear cover plate and a second impeller rear cover plate. The first impeller rear cover plate and the second impeller rear cover plate are connected at the impeller outlet, and an outlet deflector is arranged at the connection. A first horizontal channel and a first arc-shaped channel are successively communicated in the first impeller rear cover plate. A second horizontal channel and a second arc-shaped channel are successively communicated in the second impeller rear cover plate. A vertical channel is arranged in the outlet deflector. The first arc-shaped channel and the second arc-shaped channel converge at the end of the channel and are communicated with the inlet of the vertical channel. A "Y"-shaped deflector is arranged at the outlet end of the vertical channel. Class-conical deflectors are arranged at the inner positions of the upper volute and the lower volute corresponding to the "Y"-shaped deflector. The "Y"-shaped deflector is fixed at the outlet end of the vertical channel through a bracket, and it includes a vertical section, a first deflector arc section, and a second deflector arc section. The class-conical deflectors are integrally formed with the upper volute and the lower volute, and they include a first conical body arc section and a second conical body arc section. The contour lines of the first deflector arc section, the second deflector arc section, the first conical body arc section, and the second conical body arc section are all circular arcs. The radius of the first deflector arc section and the second deflector arc section is R1, and the radius of the first conical body arc section and the second conical body arc section is R2, where R2 > R1. Import and export sealing structures are arranged at the contact positions of the upper volute and the lower volute with the impeller front cover plate. Return channels are arranged in the volute sections corresponding to the import and export sealing structures.

[0008] Further, in the radial direction, the radial distance between the inlet of the return channel and the top of the class-conical deflector is H1, and the radial distance between the inlet of the return channel and the top of the "Y"-shaped deflector is H2, where H2 > H1.

[0009] Further, H2 = 1.5 - 1.8H1.

[0010] Further, the export sealing structure includes a sealing ring on the outlet side of the impeller front cover plate and a sealing ring on the outlet side of the volute. The cross-sectional shape of the sealing ring on the outlet side of the front cover plate is an obtuse triangle, and the cross-sectional shape of the sealing ring on the outlet side of the volute is an acute triangle. There is a gap between the sealing ring on the outlet side of the impeller front cover plate and the sealing ring on the outlet side of the volute.

[0011] Further, the import sealing structure includes a sealing ring on the inlet side of the impeller front cover plate and a sealing ring on the inlet side of the volute. The cross-sectional shape of the sealing ring on the inlet side of the front cover plate is an isosceles triangle, and the cross-sectional shape of the sealing ring on the inlet side of the volute is a two-continuous tooth-shaped structure. The tooth-shaped structure is adapted to the isosceles triangle and forms a tooth-shaped gap.

[0012] Further, the inlet radius of the impeller is R, and R1 = 0.1 - 0.2R.

[0013] Furthermore, the inlet radius of the impeller is R, and R2 = 0.3 - 0.5R.

[0014] Furthermore, in the radial direction, the outlet position of the outlet guide vane protrudes from the outlet positions of the upper volute and the lower volute.

[0015] Furthermore, the structures of the first horizontal flow channel and the second horizontal flow channel are the same and are located at the same radial position.

[0016] Furthermore, the "Y"-shaped deflector is formed by injection molding of polyethylene material.

[0017] A double-suction pump with a voltage stabilizing circuit according to the present invention, the adjacent rear impeller covers include a first rear impeller cover and a second rear impeller cover. The first rear impeller cover and the second rear impeller cover are connected at the impeller outlet, and an outlet guide vane is arranged at the connection. A first horizontal flow channel and a first arc-shaped flow channel are sequentially communicated in the first rear impeller cover. A second horizontal flow channel and a second arc-shaped flow channel are sequentially communicated in the second rear impeller cover. A vertical flow channel is arranged in the outlet guide vane. The first arc-shaped flow channel and the second arc-shaped flow channel converge at the end of the flow channel and are communicated with the inlet of the vertical flow channel. A "Y"-shaped deflector is arranged at the outlet end of the vertical flow channel. Conical deflectors are arranged at the inner positions of the upper volute and the lower volute corresponding to the "Y"-shaped deflector. The "Y"-shaped deflector is fixed at the outlet end of the vertical flow channel through a bracket, and it includes a vertical section, a first deflector arc section, and a second deflector arc section. The conical deflectors are integrally formed with the upper volute and the lower volute, and they include a first conical body arc section and a second conical body arc section. The contour lines of the first deflector arc section, the second deflector arc section, the first conical body arc section, and the second conical body arc section are all circular arcs. The radius of the first deflector arc section and the second deflector arc section is R1, and the radius of the first conical body arc section and the second conical body arc section is R2, and R2 > R1. Import and export sealing structures are arranged at the contact positions of the upper volute and the lower volute with the front impeller cover. A return channel is arranged in the volute section corresponding to the import and export sealing structures. Due to the improvement of the double-suction pump structure, the flow characteristics are improved, the guiding efficiency is enhanced, and the vibration and noise are reduced. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a double-suction pump with a voltage stabilizing circuit;

[0019] Figure 2 It is a schematic impeller structure diagram;

[0020] Figure 3 It is a schematic voltage stabilizing circuit diagram;

[0021] Figure 4 It is a schematic sealing structure diagram.

[0022] In the figure: upper volute 1, lower volute 2, impeller 3, bearing 4, mechanical seal 5, main shaft 6, front cover plate 7 of the impeller, rear cover plate 8 of the impeller, hub 9, blade 10, first horizontal flow channel 11, first arc-shaped flow channel 12, second horizontal flow channel 13, second arc-shaped flow channel 14, vertical flow channel 15, vertical section 16, first guide vane arc section 17, second guide vane arc section 18, first conical body arc section 19, second conical body arc section 20, return flow channel 21, outlet sealing structure 22, sealing ring 221 on the outlet side of the front cover plate of the impeller, sealing ring 222 on the outlet side of the volute, inlet sealing structure 23, sealing ring 231 on the inlet side of the front cover plate of the impeller, sealing ring 232 on the inlet side of the volute, outlet guide vane 24, first rear cover plate 25 of the impeller, second rear cover plate 26 of the impeller, inlet radius R of the impeller, radius R1 of the first guide vane arc section 17 and the second guide vane arc section 18, radius R2 of the first conical body arc section 19 and the second conical body arc section 20, radial distance H1 between the inlet of the return flow channel 21 and the top of the conical-shaped guide member, radial distance H2 between the inlet of the return flow channel 21 and the top of the "Y"-shaped guide vane. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] As Figures 1-4As shown in the figure, a double-suction pump with a voltage stabilizing circuit includes an upper volute 1, a lower volute 2, an impeller 3, a bearing 4, a mechanical seal 5, and a main shaft 6. The impeller 3 includes an impeller front cover plate 7, an impeller rear cover plate 8, a hub 9, and blades 10. The blades 10 are located in the space enclosed by the impeller front cover plate 7, the impeller rear cover plate 8, and the hub 9. It is characterized in that: the adjacent impeller rear cover plates 8 include a first impeller rear cover plate 25 and a second impeller rear cover plate 26. The first impeller rear cover plate 25 and the second impeller rear cover plate 26 are connected at the outlet of the impeller 3, and an outlet guide vane 24 is arranged at the connection. A first horizontal flow channel 11 and a first arc flow channel 12 are successively communicated in the first impeller rear cover plate 25. A second horizontal flow channel 13 and a second arc flow channel 14 are successively communicated in the second impeller rear cover plate 25. A vertical flow channel 15 is arranged in the outlet guide vane 24. The first arc flow channel 12 and the second arc flow channel 14 converge at the end of the flow channel and are communicated with the inlet of the vertical flow channel 15. A Y-shaped deflector is arranged at the outlet end of the vertical flow channel 15. A conical deflector is arranged at the inner side position of the upper volute 1 and the lower volute 2 corresponding to the Y-shaped deflector. The Y-shaped deflector is fixed at the outlet end of the vertical flow channel 15 through a bracket, and it includes a vertical section 16, a first deflector arc section 17, and a second deflector arc section 18. The conical deflector is integrally formed with the upper volute 1 and the lower volute 2, and it includes a first conical body arc section 19 and a second conical body arc section 20. The contour lines of the first deflector arc section 17, the second deflector arc section 18, the first conical body arc section 19, and the second conical body arc section 20 are all circular arcs. The radius of the first deflector arc section 17 and the second deflector arc section 18 is R1, and the radius of the first conical body arc section 19 and the second conical body arc section 20 is R2, and R2 > R1. An inlet sealing structure 23 and an outlet sealing structure 22 are arranged at the contact position of the upper volute 1 and the lower volute 2 with the impeller front cover plate 7. A return channel 21 is arranged in the volute section corresponding to the inlet sealing structure 23 and the outlet sealing structure 22.

[0026] Further, in the radial direction, the radial distance between the inlet of the return channel 21 and the top of the conical deflector is H1, and the radial distance between the inlet of the return channel 21 and the top of the Y-shaped deflector is H2, where H2 > H1.

[0027] Further, H2 = 1.5 - 1.8H1.

[0028] Further, the outlet sealing structure 22 includes an impeller front cover plate outlet side sealing ring 221 and a volute outlet side sealing ring 222. The cross-sectional shape of the front cover plate outlet side sealing ring 221 is an obtuse triangle, and the cross-sectional shape of the volute outlet side sealing ring 222 is an acute triangle. There is a gap between the impeller front cover plate outlet side sealing ring 221 and the volute outlet side sealing ring 222.

[0029] Furthermore, the inlet sealing structure 23 includes an impeller front cover plate inlet side sealing ring 231 and a volute inlet side sealing ring 232. The cross-sectional shape of the front cover plate inlet side sealing ring 231 is an isosceles triangle, and the cross-sectional shape of the volute inlet side sealing ring 232 is a two-continuous tooth-shaped structure. The tooth-shaped structure is adapted to the isosceles triangle and forms a tooth-shaped gap.

[0030] Furthermore, the inlet radius of the impeller is R, and R1 = 0.1 - 0.2R.

[0031] Furthermore, the inlet radius of the impeller is R, and R2 = 0.3 - 0.5R.

[0032] Furthermore, in the radial direction, the outlet position of the outlet guide vane 24 protrudes from the outlet positions of the upper volute 1 and the lower volute 2.

[0033] Furthermore, the structures of the first horizontal flow channel 11 and the second horizontal flow channel 13 are the same and are located at the same radial position.

[0034] Furthermore, the "Y"-shaped fluid guide is formed by injection molding with polyethylene material.

[0035] A double-suction pump with a voltage-stabilizing circuit according to the present invention. The adjacent rear covers of the impeller 8 include a first rear cover 25 of the impeller and a second rear cover 26 of the impeller. The first rear cover 25 of the impeller and the second rear cover 26 of the impeller are connected at the outlet of the impeller 3, and an outlet guide vane 24 is provided at the connection. A first horizontal flow channel 11 and a first arc-shaped flow channel 12 are successively communicated in the first rear cover 25 of the impeller. A second horizontal flow channel 13 and a second arc-shaped flow channel 14 are successively communicated in the second rear cover 25 of the impeller. A vertical flow channel 15 is provided in the outlet guide vane 24. The first arc-shaped flow channel 12 and the second arc-shaped flow channel 14 converge at the end of the flow channel and are communicated with the inlet of the vertical flow channel 15. A "Y"-shaped deflector is provided at the outlet end of the vertical flow channel 15. Conical deflector members are provided at the inner positions of the upper volute 1 and the lower volute 2 corresponding to the "Y"-shaped deflector. The "Y"-shaped deflector is fixed to the outlet end of the vertical flow channel 15 through a bracket, and it includes a vertical section 16, a first deflector arc section 17, and a second deflector arc section 18. The conical deflector members are integrally formed with the upper volute 1 and the lower volute 2, and they include a first conical body arc section 19 and a second conical body arc section 20. The contour lines of the first deflector arc section 17, the second deflector arc section 18, the first conical body arc section 19, and the second conical body arc section 20 are all circular arcs. The radius of the first deflector arc section 17 and the second deflector arc section 18 is R1, and the radius of the first conical body arc section 19 and the second conical body arc section 20 is R2, and R2 > R1. An inlet sealing structure 23 and an outlet sealing structure 22 are provided at the contact positions of the upper volute 1 and the lower volute 2 with the front cover 7 of the impeller. A return channel 21 is provided in the volute section corresponding to the inlet sealing structure 23 and the outlet sealing structure 22. Due to the improvement of the double-suction pump structure, the flow characteristics are improved, the guiding efficiency is enhanced, and the vibration and noise are reduced.

Claims

1. A double-suction pump with a pressure-stabilizing circuit, comprising an upper volute (1), a lower volute (2), an impeller (3), a bearing (4), a mechanical seal (5), and a main shaft (6), wherein the impeller (3) comprises an impeller front cover (7), an impeller rear cover (8), a hub (9), and blades (10), and the blades (10) are located in a space enclosed by the impeller front cover (7), the impeller rear cover (8), and the hub (9); characterized in that: The adjacent impeller rear cover plates (8) include a first impeller rear cover plate (25) and a second impeller rear cover plate (26); the first impeller rear cover plate (25) and the second impeller rear cover plate (26) are connected at the outlet of the impeller (3); an outlet guide plate (24) is provided at the connection point; a first horizontal flow channel (11) and a first arc-shaped flow channel (12) are sequentially connected in the first impeller rear cover plate (25); a second horizontal flow channel (13) and a second arc-shaped flow channel (14) are sequentially connected in the second impeller rear cover plate (26); a vertical flow channel (15) is provided in the outlet guide plate (24); the first arc-shaped flow channel (12) and the second arc-shaped flow channel (14) are connected in sequence; (14) intersect at the end of the flow channel and communicate with the inlet of the vertical flow channel (15); a "Y"-shaped guide body is provided at the outlet end of the vertical flow channel (15), and a conical guide piece is provided at the inner side of the upper volute (1) and the lower volute (2) corresponding to the "Y"-shaped guide body; the "Y"-shaped guide body is fixed to the outlet end of the vertical flow channel (15) through a bracket, and comprises a vertical section (16), a first guide body arc section (17), and a second guide body arc section (18); the conical guide piece is integrally formed with the upper volute (1) and the lower volute (2), and comprises a first conical body arc section (19), a second conical body arc section (20); the first guide The contour lines of the fluid arc segment (17), the second flow guide arc segment (18), the first cone arc segment (19), and the second cone arc segment (20) are all circular arc lines; the radius of the first flow guide arc segment (17) and the second flow guide arc segment (18) is R1, the radius of the first cone arc segment (19) and the second cone arc segment (20) is R2, and R2>R1; the contact points between the upper volute (1) and the lower volute (2) and the impeller front cover plate (7) are provided with an inlet sealing structure (23) and an outlet sealing structure (22); the volute segments corresponding to the inlet sealing structure (23) and the outlet sealing structure (22) are provided with a return channel ( 21); in the radial direction, the radial distance between the inlet of the return channel (21) and the top of the conical flow guide is H1, and the radial distance between the inlet of the return channel (21) and the top of the "Y"-shaped flow guide is H2, wherein H2>H1; the outlet sealing structure (22) comprises an impeller front cover plate outlet side sealing ring (221) and a volute outlet side sealing ring (222), wherein the cross-sectional shape of the front cover plate outlet side sealing ring (221) is an obtuse triangle, and the cross-sectional shape of the volute outlet side sealing ring (222) is an acute triangle, and there is a gap between the impeller front cover plate outlet side sealing ring (221) and the volute outlet side sealing ring (222).

2. A double-suction pump with a pressure-stabilizing circuit as claimed in claim 1, characterized in that: H2=(1.5~1.8)H1.

3. A double-suction pump with a pressure-stabilizing circuit as claimed in claim 1, characterized in that: The inlet sealing structure (23) comprises an impeller front cover plate inlet side sealing ring (231) and a volute inlet side sealing ring (232), wherein the cross-sectional shape of the front cover plate inlet side sealing ring (231) is an isosceles triangle, and the cross-sectional shape of the volute inlet side sealing ring (232) is two continuous tooth-shaped structures, the tooth-shaped structures are adapted to the isosceles triangle, and a tooth-shaped gap is formed.

4. A double-suction pump with a pressure-stabilizing circuit as claimed in claim 1, wherein the inlet radius of the impeller is R, and R1 = (0.1-0.2)R.

5. A double-suction pump with a pressure-stabilizing circuit as claimed in claim 1, wherein the inlet radius of the impeller is R, and R2 = (0.3-0.5)R.

6. A double-suction pump with a pressure-stabilizing circuit as claimed in claim 1, wherein in the radial direction, the outlet position of the outlet guide plate (24) protrudes from the outlet positions of the upper volute (1) and the lower volute (2).

7. A double-suction pump with a pressure-stabilizing circuit as claimed in claim 1, wherein the first horizontal flow channel (11) and the second horizontal flow channel (13) have the same structure and are located at the same radial position.

8. In the double-suction pump with a pressure-stabilizing circuit as claimed in claim 1, the "Y"-shaped flow guide body is formed by injection molding of polyethylene material.

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