Radial guide vane assembly of pump set and guide vane assembly system

Abstract

The utility model discloses a pump set radial guide vane assembly and a guide vane assembly system, and belongs to the field of pump set guide vanes. The guide vane assembly comprises an outer ring body part, one end, in the axial direction, of the outer ring body part is bent inwards to form a first bent part, and an arc-shaped transition part a is formed between the first bent part and the outer ring body part; the other end, in the axial direction, of the outer ring body part is bent inwards to form a second bent part, and a plane part d is formed on the outer wall face of the second bent part in the radial direction. When two adjacent stages of guide vane assemblies are assembled, the arc-shaped transition part a and the plane part d are in contact, abut and are positioned. A contact positioning mode of a plane and an arc surface is adopted, elastic linear contact is formed, positioning precision is improved, coaxial installation of each stage of guide vane assembly and a pump shaft is guaranteed, and the situations that positioning inclination occurs between multiple stages of guide vane assemblies, and a water pump cannot work normally are avoided.

Description

Technical Field

[0001] This utility model relates to the field of pump guide vane technology, and more specifically, to a pump radial guide vane assembly and guide vane assembly system. Background Technology

[0002] Multistage impeller pumps are key equipment that achieve high-pressure fluid transportation by connecting multiple impellers and guide vanes in series. Their core advantage lies in significantly increasing output pressure through multi-stage energy superposition while maintaining high efficiency and stability. They are widely used in petrochemical, power, and water supply systems. However, the structural complexity of multistage pumps also brings higher requirements for assembly precision, especially the coaxiality of the guide vanes at each stage with the motor shaft, which directly affects the pump's operating performance and lifespan.

[0003] In multistage pump structures, the installation positions of each stage guide vane must be strictly aligned to minimize energy loss during fluid transfer between stages. If there are deviations in the guide vane installation or insufficient coaxiality with the motor shaft, especially after multiple impellers are stacked, the deviation of a single unit may amplify at each stage, leading to an increase in overall coaxiality deviation. This will cause an imbalance in radial force during impeller rotation, triggering mechanical vibration and generating abnormal noise. Long-term operation may also accelerate bearing wear. Furthermore, the fluid is more prone to turbulence and impact within the flow channel, increasing hydraulic losses and reducing the overall pump efficiency. Therefore, achieving efficient control of the coaxiality of the guide vane installation in multistage impeller pumps is of great significance for improving pump stability and reliability. Utility Model Content

[0004] 1. Technical problem to be solved by the utility model

[0005] In response to the problem that coaxiality deviations are prone to occur during the installation of multi-stage guide vanes in existing multi-stage impeller pump structures, which can affect pump performance, this paper proposes to provide a radial guide vane assembly and guide vane assembly system for pump sets. By optimizing the guide vane structure, it is beneficial to ensure the positioning accuracy during multi-stage assembly, thereby ensuring coaxiality with the motor shaft and improving the overall performance of the pump.

[0006] 2. Technical Solution

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] This utility model discloses a radial guide vane assembly for a pump set, including an outer ring body, within which a fitting area is formed for the partial embedding of a lower-stage guide vane assembly, and further including:

[0009] The first bend is formed by bending one end of the outer ring body in the axial direction inward, and an arc-shaped transition part a is formed between the first bend and the outer ring body.

[0010] The second bending part is formed by bending inward from the other end of the outer ring body in the axial direction, and a flat part d is formed radially on the outer wall surface of the second bending part;

[0011] When two adjacent guide vane assemblies are assembled, the arc-shaped transition part a and the planar part d come into contact and abut against each other for positioning.

[0012] Furthermore, along the water inlet direction of the outer ring body, the front end of the outer ring body is bent inward to form a bend, and the bend extends radially from the outside to the inside towards the direction gradually approaching the tail end of the outer ring body; the rear end of the outer ring body is bent to form a bend.

[0013] When two adjacent guide vane assemblies are assembled, the arc-shaped transition part a of the lower guide vane assembly abuts against the planar part d of the preceding guide vane assembly for positioning.

[0014] Furthermore, the front end of the outer ring body is provided with a coaxially distributed assembly ring. The first bending part is connected between the outer ring body and the assembly ring. The front end of the assembly ring is provided with a radially extending front end cap. The bottom end of the second bending part is bent axially toward the direction close to the first bending part to form an axially extending inner stop ring.

[0015] When assembling two adjacent guide vane assemblies, the assembly ring of the lower guide vane assembly is fitted into the inner cavity of the inner stop ring of the preceding guide vane assembly with clearance fit.

[0016] Furthermore, it also includes a guide vane section, which includes a positive guide vane and a negative guide vane arranged sequentially along the water flow direction. The negative guide vane is fixed on the front end cover, and the front end of the positive guide vane is provided with a radially extending front connecting wall, and the outer edge of the front connecting wall is provided with an axially extending shaft extension.

[0017] When assembling two adjacent guide vane assemblies, the shaft extension of the lower guide vane assembly is fitted into the inner cavity of the assembly ring of the preceding guide vane assembly with clearance fit.

[0018] Furthermore, an arc-shaped transition portion b is formed between the inner stop ring and the second bend, and the radius R2 of the arc-shaped transition portion b is greater than the radius R1 of the arc-shaped transition portion a; or, the radius R1 of the arc-shaped transition portion a is 1.2mm≤R1≤2mm; the radius R2 of the arc-shaped transition portion b is ≥2.5mm; or / and, the angle between the extension direction of the first bend and the radial extension direction of the outer ring body is 9°-45°.

[0019] Furthermore, the roughness of the flat surface d on the second bend is less than 3.2, and the perpendicularity of the flat surface d reaches level 7-9, with the flatness level of the flat surface d being lower than the perpendicularity level.

[0020] This utility model also provides a pump set guide vane assembly system, including a base, a pump casing, and a front bearing seat pressed between the base and the pump casing. The pump shaft is installed in the base and extends through the front bearing seat into the pump casing. Multiple stages of guide vane assemblies as described above are sequentially installed in the pump casing around the outer periphery of the pump shaft.

[0021] Furthermore, the multi-stage guide vane assembly includes a first-stage guide vane and a last-stage guide vane, wherein the arc-shaped transition portion a on the first-stage guide vane is positioned against the inner wall plane of the pump casing, and the flat portion d on the last-stage guide vane is positioned against the side wall plane of the front bearing housing.

[0022] Furthermore, the pump casing includes an axially extending main casing, the front end of which has a radially extending end cap; and the middle of the end cap has an axially protruding end cap protrusion, and an arc-shaped transition portion c is formed between the end cap protrusion and the end cap, the arc radius R3 of the arc-shaped transition portion c is greater than the arc radius R1 of the arc-shaped transition portion a; the arc-shaped transition portion a on the first-stage guide vane abuts against the inner wall plane of the end cap, and the front end of the first-stage guide vane has an assembly ring portion, which maintains an inner and outer coaxial clearance fit with the inner wall of the end cap protrusion.

[0023] Furthermore, the front bearing housing includes a radially extending main body, with a shaft hole in the middle for the pump shaft to pass through, and a first convex ring portion protruding axially on the wall surface of the main body facing the final stage guide vane; the flat portion d on the final stage guide vane abuts against the flat wall surface of the main body, and the tail end of the final stage guide vane has an inner stop ring, and the outer wall of the first convex ring portion and the inner stop ring maintain an inner and outer coaxial clearance fit.

[0024] 3. Beneficial effects

[0025] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0026] (1) The guide vane assembly of this utility model is formed by bending at both ends of the outer ring body to form a bending part one and a bending part two, and an arc-shaped transition part a is formed between the bending part one and the outer ring body. A flat part d is formed radially on the outer wall of the bending part two. When the multi-stage guide vane assembly is assembled, the arc-shaped transition part a and the flat part d are used for positioning. The front and rear guide vane assemblies adopt the contact positioning method of plane and arc surface, realizing the contact positioning method of surface and line. It has a stronger self-adjustment function, forms elastic line contact, improves positioning accuracy, ensures the coaxiality of the guide vane assembly and the pump shaft, and avoids the situation of positioning tilt and pump failure between the multi-stage guide vane assemblies.

[0027] (2) The guide vane assembly system of this utility model has a bent part 1 forming an arc transition part a at the axial front end of the outer ring body and a bent part 2 forming a flat part d at the axial rear end. This allows the first-stage guide vane to be positioned by contact with the inner wall of the pump casing and between the front and rear guide vane assemblies using a planar and arc-shaped contact method. In addition, the axial and radial clearance fit between the multi-stage guide vane assemblies ensures the accuracy of the positioning and installation, avoids the situation where double positioning cannot be installed, and also reserves sufficient adjustment space for linear contact, further ensuring the positioning accuracy. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the pump unit in the embodiment;

[0029] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the pump unit in the embodiment;

[0030] Figure 3 for Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0031] Figure 4 for Figure 2 A schematic diagram of a partial axial side view at point A in the middle;

[0032] Figure 5 This is a schematic diagram of the explosion state of the multi-stage guide vane assembly in the embodiment;

[0033] Figure 6 This is a schematic diagram of the front bearing housing in the embodiment;

[0034] Figure 7 This is a partially enlarged schematic diagram of the fit between the last stage guide vane and the front bearing housing in the embodiment.

[0035] Figure 8 This is a schematic diagram of the structure of the intermediate guide vane in the embodiment;

[0036] Figure 9 for Figure 8 A schematic diagram of the cross-sectional structure of the middle guide vane;

[0037] Figure 10 This is a schematic diagram of the structure of the final stage guide vane in the embodiment.

[0038] Explanation of the labels in the diagram:

[0039] 100. Base; 101. Main body; 102. Pump shaft;

[0040] 200. Pump shell; 201. Main shell; 202. Shell end cover; 203. End cover convex part; 210. Seal;

[0041] 300. First-stage guide vane; 310. Intermediate guide vane; 320. Last-stage guide vane; 330. Guide vane section;

[0042] 301. Outer ring body; 302. Bending part one; 303. Assembly ring part; 304. Front end cover; 305. Bending part two; 306. Inner stop ring;

[0043] 311. Reverse guide vane; 312. Forward guide vane; 313. Front connecting wall; 314. Shaft extension; 315. Radial extension; 316. Rear connecting wall; 321. Outlet;

[0044] 400. Front bearing housing; 401. Inner main body; 402. Shaft hole; 403. Outer edge; 404. First convex ring; 405. Main body; 406. Second convex ring;

[0045] 500. Impeller. Detailed Implementation

[0046] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0047] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. The terms "first," "second," "third," and "fourth" should also be interpreted broadly, merely distinguishing feature names and not indicating a specific sequential relationship. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] The present invention will be further described below with reference to the embodiments.

[0050] Example

[0051] This embodiment first provides a radial guide vane assembly for a pump set, including an outer ring body 301, with a fitting area formed inside the outer ring body 301 for partial embedding of the lower stage guide vane assembly. It also includes: a first bending portion 302, formed by bending one end of the outer ring body 301 in the axial direction inward, and forming an arc-shaped transition portion a between the first bending portion 302 and the outer ring body 301; a second bending portion 305, formed by bending the other end of the outer ring body 301 in the axial direction inward, and forming a flat portion d radially on the outer wall surface of the second bending portion 305; when two adjacent stage guide vane assemblies are assembled, the arc-shaped transition portion a and the flat portion d are contacted and positioned to achieve line contact positioning. The arc-shaped transition portion a and the flat portion d are located at both ends of the outer ring body 301 along the axial direction. For example, along the water flow direction, the arc-shaped transition portion a is at the front end and the flat portion d is at the rear end, or the arc-shaped transition portion a is at the rear end and the flat portion d is at the front end. Both can achieve line contact positioning between adjacent guide vane assemblies and ensure positioning accuracy. In a preferred embodiment, the front end of the outer ring body 301 is bent inward to form a first bend portion 302, and the first bend portion 302 extends radially from the outside to the inside towards the tail end of the outer ring body 301; the rear end of the outer ring body 301 is bent to form a second bend portion 305; when two adjacent guide vane assemblies are assembled, the arc-shaped transition portion a of the lower guide vane assembly abuts against the flat portion d of the previous guide vane assembly for positioning.

[0052] This embodiment also provides a multi-stage impeller pump unit system to illustrate in detail the system structure when the multi-stage guide vane assembly is installed. Specifically, in conjunction with... Figures 1-10 As shown, the multi-stage impeller pump unit system includes a base 100, a pump casing 200, and a front bearing housing 400 pressed between the base 100 and the pump casing 200. The pump shaft 102 is installed in the base 100 and extends through the front bearing housing 400 into the pump casing 200. Multi-stage guide vane assemblies are respectively fitted onto the pump shaft 102 in the pump casing 200. More specifically, the base 100 includes a main body 101, and a motor assembly, including the pump shaft 102, a rotor assembly, and a stator assembly, is installed inside the main body 101. Multi-stage guide vane assemblies and multi-stage impellers 500 are installed inside the pump casing 200. The impellers 500 are correspondingly installed in the guide vane internal area of ​​the guide vane assembly. The liquid thrown out by the impellers 500 is guided by the guide vanes to the next stage impeller 500 to achieve multi-stage pressurization of the water flow and finally guide the liquid to the high-pressure area for discharge.

[0053] In this embodiment, the multi-stage guide vane assembly includes a first-stage guide vane 300 and a last-stage guide vane 320, so as to... Figure 3Taking the three-stage guide vane assembly shown as an example, it includes a first-stage guide vane 300, intermediate guide vanes 310, and a last-stage guide vane 320. When there are more than three stages, there are multiple sets of intermediate guide vanes 310. Each stage guide vane assembly has an arc-shaped abutment at the front and a flat abutment at the rear along the axial direction. The first-stage guide vane 300 is positioned by contacting and abutting against the inner wall of the pump casing 200 through the arc-shaped abutment at the front. The next stage guide vane assembly is positioned by contacting and abutting against the flat abutment at the rear of the previous stage guide vane assembly through the arc-shaped abutment at the front. The last stage guide vane 320 is positioned by contacting and abutting against the side wall of the front bearing housing 400 through the flat abutment at the rear. A sealing area is formed below each arc-shaped abutment, and a sealing element 210 is provided in the sealing area. The use of arc-shaped abutment and flat abutment for surface-line contact positioning helps to fully ensure the accuracy of the fitting of each stage of guide vane assembly, ensure coaxiality with pump shaft 102, improve fitting sealing, and at the same time utilize the area below the surface-line contact area to form a further sealing zone, fitting the sealing element 210 for full sealing, specifically using O-ring seals.

[0054] More specifically, combined Figures 2-5 As shown, the structure of the guide vane assembly is as follows: each stage guide vane assembly has an outer ring body 301 coaxially surrounding the pump shaft 102. The outer ring body 301 contains a guide vane fitting area for the guide vane portion 330 of the next stage guide vane assembly to be fitted into. The front end of the outer ring body 301 is bent inwards to form a bend 302, and an arc-shaped transition portion a is formed between the bend 302 and the outer ring body 301, such as... Figure 4 As indicated by the markings, the first bend 302 extends radially from the outside inward toward the end of the assembly ring 303; the end of the outer ring 301 has an inwardly bent second bend 305, and a flat portion d is formed radially on the outer wall of the second bend 305; when assembling the multi-stage guide vane assembly, the arc-shaped transition portion a is used as the arc-shaped abutment portion, and the flat portion d is used as the flat abutment portion. The arc-shaped transition portion a of the first bend 302 on the first stage guide vane 300 abuts against the inner wall plane of the pump casing 200 for positioning. The arc-shaped transition portion a of the first bend 302 on the next stage guide vane abuts against the flat portion d of the second bend 305 on the previous stage guide vane for positioning. The flat portion d of the second bend 305 on the last stage guide vane 320 abuts against the side wall plane of the front bearing seat 400 for positioning.

[0055] By employing the above method, a planar and arc-shaped contact positioning method is used between the first-stage guide vane 300 and the inner wall of the pump casing 200, as well as between the guide vane assemblies of the preceding and following stages. This achieves a surface-to-line contact positioning method, which effectively reduces the requirements for the flatness of the planar portion d of the second bending section 305 and the inner wall of the pump casing 200, as well as the parallelism requirements of the planar portion d of the second bending section 305 relative to the arc-shaped transition portion a on the first bending section 302. Furthermore, this contact method has a stronger self-adjusting function. The line contact between the arc-shaped transition portion a of the first bending section 302 and the planar portion d of the second bending section 305 allows for slight elastic deformation of the material near the contact area, forming an "elastic line contact." By coordinating local unevenness through deformation, a continuous sealing line can be formed, increasing the sealing performance between the guide vane assemblies of each stage. This linear contact positioning method also avoids the flatness errors inherent in traditional surface contact, especially the cumulative errors between multi-stage guide vane assemblies, which can lead to positioning tilting, poor coaxiality with the pump shaft 102, pump vibration and abnormal noise, or even malfunction. This linear contact also further distributes stress evenly along the contact line, preventing stress concentration that could cause deformation of the contact surface and affect positioning accuracy.

[0056] Furthermore, in the guide vane assembly structure, the front end of the outer ring body 301 is also provided with a coaxially distributed assembly ring 303. A first bend 302 is connected between the outer ring body 301 and the assembly ring 303, and the first bend 302 and the assembly ring 303 are also smoothly connected. The front end of the assembly ring 303 is provided with a radially extending front end cover 304, and the front end cover 304 is provided with a through hole for the pump shaft 102 to pass through. The bottom end of the second bend 305 continues to bend axially toward the first bend 302 to form an axially extending inner stop ring 306, and an arc-shaped transition portion b is formed between the inner stop ring 306 and the second bend 305. When assembling a multi-stage guide vane assembly, the bending portion 305 and inner stop ring 306 of the preceding stage, together with the bending portion 302 and assembly ring 303 of the following stage, form a variable diameter sealing area with a cross-section approaching a triangle. That is, the space in the radially inward region increases, providing adequate space for the sealing ring installation. Furthermore, when the two stages of the guide vane assembly are in line contact and positioned, they can effectively compress the sealing ring, further improving the sealing performance between the guide vane assemblies, further reducing the head and efficiency losses caused by inter-stage leakage, and improving the pump's energy efficiency rating. In practice, the assembly ring 303 of the next-stage guide vane assembly corresponds to the inner stop ring 306 of the previous-stage guide vane assembly, and maintains a coaxial clearance fit. In practice, the radial fit clearance is preferably 0.02-0.2mm. The inner stop ring 306 of the previous-stage guide vane assembly forms a radial positioning for the next-stage guide vane assembly, which not only ensures the accuracy of positioning and installation, but also avoids the situation where double positioning cannot be installed. At the same time, it also reserves sufficient adjustment space for linear contact and can reduce the amount of fluid leakage from the high-pressure area to the low-pressure area in the guide vane, thereby improving the head and efficiency.

[0057] Specifically, in practice, the arc transition portion a between the bending portion 302 and the front end of the outer ring body portion 301 is preferably controlled to have an arc radius R1 between 1.2mm and 2mm, and can be formed by stretching to form an arc surface without secondary processing. Furthermore, the angle between the inclined extension direction of the first bending portion 302 and the radial extension direction of the outer ring body portion 301 is preferably 9°-45°, such as 9°, 15°, 30°, 45°, etc., to avoid bending breakage and to form a sufficient variable diameter sealing area. The second bending portion 305 and the tail end of the outer ring body portion 301 are also smoothly transitioned by stretching and forming an arc. The outer wall surface of the radially extending second bending portion 305 is further processed to form a flat portion d. It is preferable to control the roughness of the flat portion d to be less than 3.2, and the perpendicularity of the flat portion d to meet the requirements of grade 7-9. The flatness grade of the flat portion d is lower than the perpendicularity grade, such as a flatness grade of 7 and a perpendicularity grade of 8 or 9, etc., to ensure that when the last stage guide vane 320 is installed, the flat portion d is used to maintain a tight abutment and positioning with the side wall plane of the front bearing seat 400, and has strong sealing performance. The transition between the second bending part 305 and the inner stop ring 306 is a large arc. The arc radius R2 of the arc transition part b is greater than the arc radius R1 of the arc transition part a between the first bending part 302 and the outer ring body part 301. Specifically, R2 is controlled to be ≥2.5mm to facilitate the formation of a variable diameter sealing area.

[0058] To achieve line contact fit between the first-stage guide vane 300 and the pump casing 200, and the formation of a triangular sealing area, in practice, the pump casing 200 can be preferably designed as follows: the pump casing 200 includes an axially extending main casing 201, the front end of the main casing 201 having a radially extending end cap 202; and the middle of the end cap 202 is provided with an axially outwardly protruding end cap protrusion 203, and an arc-shaped transition portion c is also formed between the end cap protrusion 203 and the end cap 202. Similarly, the radius of the arc of the arc-shaped transition portion c is controlled to be ≥2.5mm. A variable diameter sealing area is formed between the arc-shaped transition portion and the bend portion 302 of the first-stage guide vane 300; the arc-shaped transition portion a of the bend portion 302 of the first-stage guide vane 300 abuts against the inner wall plane of the end cap 202, and the assembly ring portion 303 of the first-stage guide vane 300 and the inner wall of the end cap protrusion 203 maintain an inner and outer coaxial clearance fit. Similarly, the radial fit clearance is preferably 0.02-0.2mm to avoid the situation where double positioning cannot be installed, to reserve sufficient adjustment space for linear contact, and to reduce fluid leakage.

[0059] Combination Figures 3-6As shown, further, the front bearing housing 400 can be designed as follows: it includes a radially extending main body 405, with a shaft hole 402 in the middle of the main body 405 for the pump shaft 102 to pass through, and a first convex ring 404 protruding axially on the wall surface of the main body 405 facing the final stage guide vane 320; the flat surface d of the bent portion 305 on the final stage guide vane 320 abuts against and is positioned against the flat wall surface of the main body 405, and the outer wall of the first convex ring 404 maintains a coaxial clearance fit with the inner stop ring 306 on the final stage guide vane 320, preferably with a radial clearance of 0.02-0.2 mm. Axial planar abutment positioning is achieved by the cooperation between the main body 405 of the front bearing housing 400 and the bent portion 305 on the final stage guide vane 320, and radial positioning is achieved by the cooperation between the first convex ring 404 of the front bearing housing 400 and the inner stop ring 306 of the final stage guide vane 320.

[0060] More specifically, combining Figure 5 and Figure 6 The outer edge of the main body 405 of the front bearing housing 400 is the outer edge 403. The inner surface of the outer edge 403 has an axially protruding second convex ring 406 facing the pump housing 200. The main housing 201 of the pump housing 200 is fitted onto the outer periphery of the second convex ring 406 and abuts against and presses against the outer edge 403, thereby pressing the front bearing housing 400 between the pump housing 200 and the main seat 101 of the base 100. A sealing ring can be provided between the main housing 201 and the second convex ring 406 for sealing. The first convex ring 404 and the second convex ring 406 are coaxially distributed on the inner side of the main body 405, and a radially extending inner main body 401 is formed between the annular ends of the first convex ring 404. The shaft hole 402 is opened at the center of the inner main body 401.

[0061] In this embodiment, further, the front end cap 304 of the intermediate guide vane 310 and the final guide vane 320 is also provided with a guide vane portion 330, which is fitted into the inner cavity of the outer ring body portion 301 of the preceding guide vane assembly; while the first-stage guide vane 300 does not need to be provided with a guide vane portion 330, and the outer ring body portion 301 of the final guide vane 320 is provided with multiple outlet holes 321 to facilitate the flow of pressurized liquid to the high-pressure zone for discharge. Specifically, in conjunction with Figures 8-10As shown, the guide vane section 330 includes a positive guide vane 312 and a negative guide vane 311 arranged sequentially along the water flow direction. The negative guide vane 311 is fixed on the front end cover 304. The front end of the negative guide vane 311 is connected to the positive guide vane 312 through the rear connecting wall 316. The front end of the positive guide vane 312 is provided with a radially extending front connecting wall 313. The outer edge of the front connecting wall 313 is provided with an axially extending shaft extension 314. When the multi-stage guide vane assembly is assembled, the shaft extension 314 of the subsequent stage guide vane assembly and the inner wall of the assembly ring 303 of the previous stage guide vane assembly maintain an inner and outer coaxial clearance fit, specifically a radial clearance of 0.02-0.2 mm. Furthermore, the front end of the shaft extension 314 is provided with a radially inwardly extending radial extension 315. The radial extension 315 of the next stage guide vane assembly maintains a clearance fit with the inner wall of the front end cover 304 of the previous stage guide vane assembly. Specifically, the axial clearance is a fit clearance ≥ 0.5 mm, to ensure that the shaft extension 314 does not contact the front end cover 304 of the previous stage guide vane assembly, and to avoid the situation of double positioning at both ends of the same stage guide vane assembly affecting installation.

[0062] The multi-stage impeller pump unit system of this embodiment, namely the pump unit guide vane assembly system, utilizes the limiting fit between adjacent multi-stage guide vane assemblies, between the first-stage guide vane 300 and the pump casing 200, and between the last-stage guide vane 320 and the front bearing seat 400. This effectively improves the installation accuracy of the multi-stage guide vane assembly, ensures its coaxiality with the pump shaft 102, improves sealing performance, and comprehensively enhances the overall performance of the pump unit.

[0063] The scope of protection of this utility model is defined only by the claims. Thanks to the teachings of this utility model, those skilled in the art will readily recognize that alternative structures to the disclosed structure can be used as feasible alternative implementations, and that the disclosed implementations can be combined to produce new implementations, which also fall within the scope of the appended claims.

Claims

1. A radial guide vane assembly for a pump unit, comprising an outer ring body (301), wherein the outer ring body (301) has a fitting area for partially embedding a lower guide vane assembly, characterized in that: Also includes: The first bending part (302) is formed by bending one end of the outer ring body part (301) in the axial direction inward, and an arc-shaped transition part a is formed between the first bending part (302) and the outer ring body part (301); The second bending part (305) is formed by bending inward from the other end of the outer ring body part (301) in the axial direction, and a flat part d is formed radially on the outer wall surface of the second bending part (305); When two adjacent guide vane assemblies are assembled, the arc-shaped transition part a and the planar part d come into contact and abut against each other for positioning.

2. The radial guide vane assembly of a pump set according to claim 1, characterized in that: Along the water inlet direction inside the outer ring body (301), the front end of the outer ring body (301) is bent inward to form a first bend (302), and the first bend (302) extends radially from the outside to the inside towards the direction gradually approaching the tail end of the outer ring body (301); the rear end of the outer ring body (301) is bent to form a second bend (305). When two adjacent guide vane assemblies are assembled, the arc-shaped transition part a of the lower guide vane assembly abuts against the planar part d of the preceding guide vane assembly for positioning.

3. The radial guide vane assembly for a pump set according to claim 1, characterized in that: The outer ring body (301) is also provided with a coaxially distributed assembly ring (303) at the front end. A bending part one (302) is connected between the outer ring body (301) and the assembly ring (303). The front end of the assembly ring (303) is provided with a radially extending front end cap (304). The bottom end of the bending part two (305) is bent axially toward the bending part one (302) to form an axially extending inner stop ring (306). When assembling two adjacent guide vane assemblies, the assembly ring (303) of the lower guide vane assembly is fitted into the inner cavity of the inner stop ring (306) of the preceding guide vane assembly with clearance.

4. A radial guide vane assembly for a pump set according to claim 3, characterized in that: It also includes a guide vane section (330), which includes a positive guide vane (312) and a reverse guide vane (311) arranged sequentially along the water flow direction. The reverse guide vane (311) is fixed on the front end cover (304). The front end of the positive guide vane (312) is provided with a radially extending front connecting wall (313), and the outer edge of the front connecting wall (313) is provided with an axially extending shaft extension (314). When assembling two adjacent guide vane assemblies, the shaft extension (314) of the lower guide vane assembly is fitted into the inner cavity of the assembly ring (303) of the preceding guide vane assembly with clearance fit.

5. A radial guide vane assembly for a pump set according to claim 3, characterized in that: An arc-shaped transition portion b is formed between the inner stop ring (306) and the second bending portion (305), and the arc radius R2 of the arc-shaped transition portion b is greater than the arc radius R1 of the arc-shaped transition portion a; or, the arc radius R1 of the arc-shaped transition portion a is 1.2mm≤R1≤2mm; the arc radius R2 of the arc-shaped transition portion b is ≥2.5mm; or / and, the angle between the extension direction of the first bending portion (302) and the radial extension direction of the outer ring body portion (301) is 9°-45°.

6. A radial guide vane assembly for a pump set according to claim 3, characterized in that: The roughness of the flat part d on the bent part 2 (305) is less than 3.2, and the perpendicularity of the flat part d reaches level 7-9. The flatness level of the flat part d is less than the perpendicularity level.

7. A pump guide vane assembly system, comprising a base (100), a pump casing (200), and a front bearing housing (400) pressed between the base (100) and the pump casing (200), wherein a pump shaft (102) is mounted in the base (100) and extends through the front bearing housing (400) into the pump casing (200), characterized in that: Multiple stages of guide vane assemblies as described in any one of claims 1-6 are sequentially installed inside the pump casing (200) on the outer periphery of the pump shaft (102).

8. A pump set guide vane assembly system according to claim 7, characterized in that: The multi-stage guide vane assembly includes a first-stage guide vane (300) and a last-stage guide vane (320), wherein the arc-shaped transition portion a on the first-stage guide vane (300) is positioned against the inner wall plane of the pump casing (200), and the flat portion d on the last-stage guide vane (320) is positioned against the side wall plane of the front bearing housing (400).

9. A pump set guide vane assembly system according to claim 8, characterized in that: The pump casing (200) includes an axially extending main casing (201), the front end of which has a radially extending end cap (202); and the middle part of the end cap (202) is provided with an axially protruding end cap protrusion (203), and an arc-shaped transition portion c is formed between the end cap protrusion (203) and the end cap (202), the arc radius R3 of the arc-shaped transition portion c is greater than the arc radius R1 of the arc-shaped transition portion a; the arc-shaped transition portion a on the first stage guide vane (300) abuts against the inner wall plane of the end cap (202), and the front end of the first stage guide vane (300) has an assembly ring portion (303), which maintains an inner and outer coaxial clearance fit with the inner wall of the end cap protrusion (203).

10. A pump set guide vane assembly system according to claim 8, characterized in that: The front bearing housing (400) includes a radially extending main body (405), the middle of which is provided with a shaft hole (402) for the pump shaft (102) to pass through, and the wall surface of the main body (405) facing the final stage guide vane (320) is provided with a first convex ring (404) protruding along the axial direction; the flat part d on the final stage guide vane (320) abuts against the flat wall surface of the main body (405), and the tail end of the final stage guide vane (320) has an inner stop ring (306), and the outer wall of the first convex ring (404) and the inner stop ring (306) maintain an inner and outer coaxial clearance fit.

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