Rear cover plate device and impeller

Abstract

The utility model relates to impeller back cover plate technical field discloses a back cover plate device and impeller, including framework and a plurality of cover plates, framework is provided with mounting hole, a plurality of cover plates set up in the side of framework, and connect the framework, a plurality of cover plates are along the circumferential and radial distribution of mounting hole, and a plurality of cover plates are spliced and present annularly. Set up a plurality of cover plates in the side of framework, and connect in the framework, a plurality of along the circumferential and radial distribution of mounting hole cover plate combination forms the back cover plate of impeller, and the relatively smaller back cover plate of relatively larger size is formed through the splicing of cover plate, has reduced the processing size, and the back cover plate of required size can be formed through a plurality of cover plate splicing, and the large -scale of impeller is convenient.

Description

Technical Field

[0001] This utility model relates to the field of impeller rear cover plate technology, specifically to a rear cover plate device and an impeller. Background Technology

[0002] An impeller typically includes an impeller body, a front cover plate, a rear cover plate, and a frame. The front and rear cover plates are located at the front and rear ends of the impeller body, and the frame is built into the impeller body.

[0003] CN111089077A discloses a wear-resistant silicon carbide ceramic impeller, including a front cover plate, a rear cover plate, a blade and a rotation center sandwiched between the front cover plate and the rear cover plate. The front end of the blade is close to the rotation center, and the rear end of the blade is close to the outer ring of the impeller. The blade includes a blade body and a wear-resistant block disposed at the front end of the blade body.

[0004] In the impellers mentioned above, the back cover is an integral structure. When the impeller becomes larger, the size of the corresponding back cover will also increase. However, the integrally formed back cover is not easy to process, and the yield rate of the integrally formed large-size back cover is also low. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a rear cover plate device and impeller to solve the technical problem that the integrally formed rear cover plate affects the large size of the impeller in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, this utility model provides a rear cover plate device, comprising: The frame is equipped with mounting holes; and Multiple cover plates are disposed on one side of the frame and connected to the frame. The multiple cover plates are distributed circumferentially and radially along the mounting holes, and the multiple cover plates are spliced ​​together to form a ring.

[0007] In one embodiment, adjacent cover plates contact each other to form a first seam along the radial direction of the mounting hole, the first seam extending at least partially along the radial direction of the mounting hole.

[0008] In one embodiment, a second seam is formed between adjacent cover plates along the circumference of the mounting hole.

[0009] In one embodiment, along the radial direction of the mounting hole, at least one of two adjacent cover plates is formed with a first protrusion and the other is formed with at least one first groove, the first protrusion engaging with the first groove.

[0010] In one embodiment, along the radial direction of the mounting hole, each of the two adjacent cover plates is provided with a first protrusion and a first groove, and the first protrusion and the first groove of the two adjacent cover plates are interlocked.

[0011] In one embodiment, the rear cover assembly further includes a connector that connects the cover and the frame.

[0012] In one embodiment, the cover plate has a countersunk hole, and the connector includes a screw, the threaded end of which passes through the countersunk hole and is threadedly connected to the skeleton.

[0013] In one embodiment, the connector further includes a plug and an adhesive layer. The plug is disposed in the countersunk hole and on the side of the countersunk hole screw away from the skeleton. The adhesive layer is embedded in the countersunk hole and connects the plug, the screw, and the inner wall of the countersunk hole.

[0014] In one embodiment, the plug's outer diameter gradually decreases in the direction away from the screw.

[0015] Secondly, this utility model also provides an impeller, including the aforementioned rear cover plate device.

[0016] Compared with the prior art, the rear cover plate device and impeller provided by this utility model have multiple cover plates set on one side of the frame and connected to the frame. Multiple cover plates distributed circumferentially and radially along the mounting holes are combined to form the rear cover plate of the impeller. A relatively large rear cover plate is formed by splicing relatively small cover plates, which reduces the processing size. The required size rear cover plate can be formed by splicing multiple cover plates, which is conducive to the large-scale production of the impeller. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a rear cover plate device provided in an embodiment of the present utility model; Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle; Figure 3 This is a partial cross-sectional view of the connector in the rear cover plate device provided in one embodiment of the present utility model.

[0018] Explanation of reference numerals in the attached figures: Frame 1; Mounting hole 1a; Cover plate 2; First joint 2a; Second joint 2b; First protrusion 2c; First groove 2d; Countersunk hole 2e; First cover plate 21; Second cover plate 22; Plate body 221; Connector 3; Screw 31; Plug 32; Adhesive layer 33. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] To address the technical problem that the integrally formed rear cover plate in the prior art hinders the scaling up of the impeller, this utility model provides a rear cover plate device and an impeller that facilitates the scaling up of the impeller.

[0021] It should be noted that the rear cover plate device described in this utility model is used for, but not limited to, impellers, etc. For ease of explanation, this utility model only uses the application of the rear cover plate device to the impeller as an example for explanation. The principle of the rear cover plate device applied to other types of equipment is essentially the same as that applied to the impeller, and will not be described in detail here.

[0022] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the rear cover plate device in one embodiment of the present invention. Figure 2 yes Figure 1 The enlarged view at point A shows that the rear cover device includes a frame 1 and multiple cover plates 2. The frame 1 is provided with mounting holes 1a. Multiple cover plates 2 are provided on one side of the frame 1 and connected to the frame 1. The multiple cover plates 2 are distributed circumferentially and radially along the mounting holes 1a, and the multiple cover plates 2 are spliced ​​into a ring shape.

[0023] Specifically, multiple cover plates 2 are set on one side of the frame 1 and connected to the frame 1. Multiple cover plates 2 distributed circumferentially and radially along the mounting hole 1a are combined to form the rear cover plate of the impeller. A relatively large rear cover plate is formed by splicing relatively small cover plates 2, which reduces the processing size. The required size rear cover plate can be formed by splicing multiple cover plates 2, which facilitates the enlargement of the impeller.

[0024] It should be understood that the frame 1 can be the impeller body, the metal frame 1 inside the impeller, or the end of the impeller, etc.; the cover plate 2 can be fan-shaped, hexagonal, etc.

[0025] In a structure using multiple cover plates 2 joined together, seams are formed between adjacent cover plates 2. During the operation of the pump, the slurry or mud mainly moves along the tangential direction of the impeller rotation, and its streamlines are generally circumferentially distributed. If the seam is also designed as a circumferentially extending annular gap, the high-speed flowing fluid and the solid particles it contains will continuously and completely scour the entire seam. This scouring effect is similar to repeated cutting along the same trajectory, which will quickly erode the seam into gradually deepening grooves, thereby causing seam erosion and significantly accelerating the failure of the rear cover plate. Therefore, arranging the seam along the circumference of the rear cover plate will exacerbate the wear in this area. To address this, in one embodiment, a first seam 2a is formed between adjacent cover plates 2 along the radial direction of the mounting hole 1a, and the first seam 2a extends at least partially along the radial direction of the mounting hole 1a.

[0026] By changing the first joint 2a to extend radially along the mounting hole 1a, it can be prevented from being continuously and uniformly scourned by the circumferential fluid, thereby effectively preventing the joint from being eaten away and reducing wear at the joint.

[0027] Along the circumference of the mounting hole 1a, there is a seam between adjacent cover plates 2. In order to reduce wear of the seam, in one embodiment, a second seam 2b is formed between adjacent cover plates 2 along the circumference of the mounting hole 1a. The second seam 2b is arranged along the circumference of the mounting hole 1a.

[0028] By setting the second joint 2b radially along the mounting hole 1a, when the fluid passes through the second joint 2b circumferentially, the fluid can only pass through the second joint 2b momentarily, instead of continuously scouring circumferentially. This is equivalent to turning continuous linear cutting into brief point-like impacts, greatly dispersing and reducing the scouring energy and time acting on a unit length of the second joint 2b, thereby significantly slowing down the wear rate.

[0029] After the second joint 2b is arranged radially along the mounting hole 1a, the fluid can only pass through the joint momentarily when flowing circumferentially, rather than continuously scouring. This design transforms the original continuous linear cutting into brief point-like impacts, greatly dispersing and reducing the scouring energy and action time per unit joint length, thereby significantly reducing the wear rate.

[0030] In order to extend the first joint 2a radially along the mounting hole 1a, for this purpose, as follows: Figure 1 and Figure 2 As shown, Figure 2 As shown, in one embodiment, along the radial direction of the mounting hole 1a, at least one of two adjacent cover plates 2 is formed with a first protrusion 2c and the other is formed with at least one first groove 2d, the first protrusion 2c and the first groove 2d being fitted together.

[0031] The first protrusion 2c engages with the first groove 2d, which can change the shape and direction of the joint between adjacent cover plates 2, so that the first joint 2a where the first protrusion 2c engages with the first groove 2d extends radially along the mounting hole 1a, thereby reducing the wear of the first joint 2a.

[0032] It should be understood that the cross-sectional shape of the outer wall of the first protrusion 2c can be an arc shape, a sine shape, a cosine shape, etc. The outer wall of the first protrusion 2c and the outer wall of the cover plate 2 are smoothly transitioned, and the shape of the first groove 2d matches the shape of the first protrusion 2c.

[0033] Along the radial direction of the mounting hole 1a, one of two adjacent cover plates 2 is provided with a first protrusion 2c and the other with a first groove 2d; alternatively, both adjacent cover plates 2 may be provided with a first protrusion 2c and a first groove 2d. Specifically, as shown... Figure 2 As shown, in one embodiment, along the radial direction of the mounting hole 1a, two adjacent cover plates 2 are provided with a first protrusion 2c and a first groove 2d, and the first protrusion 2c and the first groove 2d of the two adjacent cover plates 2 are fitted together.

[0034] Both cover plates 2 are provided with a first protrusion 2c and a first groove 2d, so that the joint between two adjacent cover plates 2 can extend radially inward and outward along the mounting hole 1a, making the radial first joint 2a more tortuous and tight, further hindering the direct scouring of the joint gap by high-speed fluid containing solid particles, thus maximizing the anti-wear effect. A two-way mechanical interlock is formed between the two adjacent cover plates 2, interlocking with each other rather than simply plugging them in, which can more effectively resist forces from all directions, prevent the cover plates 2 from misaligning or separating in the radial and circumferential directions, and ensure the structural integrity of the entire rear cover plate device under high-speed operation.

[0035] To achieve the connection between cover plate 2 and frame 1, therefore, as follows: Figure 1 and Figure 3 As shown, in one embodiment, the rear cover plate device further includes a connector 3, which connects the cover plate 2 and the frame 1.

[0036] By providing connectors 3, the multiple separately configured cover plates 2 can be fixed to the frame 1. It should be understood that connectors 3 can be adhesive blocks, bolts, clips, etc.

[0037] In one embodiment, the cover plate 2 has a countersunk hole 2e, and the connector 3 includes a screw 31, the threaded end of which passes through the countersunk hole 2e and is threadedly connected to the skeleton 1.

[0038] By setting countersunk hole 2e, screw 31 can pass through cover plate 2 through countersunk hole 2e. The head of screw 31 is completely recessed into the surface of cover plate 2, so that the inner surface of the rear cover plate remains flat and smooth, avoiding the head of screw 31 from protruding and interfering with the fluid flow field, reducing eddies, energy loss and wear.

[0039] In applications involving the transport of corrosive and abrasive media such as slurry and mud, the fluid can enter the countersunk hole 2e and contact the screw 31, leading to corrosion of the screw 31 and localized erosion of the countersunk hole 2e. Therefore, as... Figure 3 As shown, in one embodiment, the connector 3 further includes a plug 32 and an adhesive layer 33. The plug 32 is disposed in the countersunk hole 2e and on the side of the countersunk hole 2e where the screw 31 is away from the frame 1. The adhesive layer 33 is built into the countersunk hole 2e and connects the plug 32, the screw 31 and the inner wall of the countersunk hole 2e.

[0040] The plug 32 acts as a physical barrier, directly sealing the opening of the countersunk hole 2e. The adhesive layer 33 fills the gap inside the countersunk hole 2e, firmly bonding the plug 32, screw 31, and cover plate 2 into a whole, achieving complete sealing and completely isolating the fluid from contact with the metal screw 31.

[0041] It should be understood that the plug 32 can be a cylinder, a cone, a prism, etc., specifically, such as Figure 3 As shown, in one embodiment, the outer diameter of the plug 32 gradually decreases in the direction away from the screw 31.

[0042] The outer diameter of the plug 32 gradually decreases in the direction away from the screw 31, and the adhesive layer 33 can form an interlocking structure with the plug 32, which can restrict the plug 32 from moving away from the screw 31.

[0043] It should be understood that the dimensions and shapes of the multiple cover plates 2 can be the same or different. Specifically, for example... Figure 1As shown, in one embodiment, two types of cover plates 2 are provided radially along the mounting hole 1a. The multiple cover plates 2 are respectively multiple first cover plates 21 and multiple first cover plates 22. The multiple first cover plates 21 are arranged sequentially along the circumference of the mounting hole 1a. The multiple first cover plates 21 have the same shape and size. Each first cover plate 21 has two first protrusions 2c and two first grooves 2d on the side facing away from the mounting hole 1a. The two first protrusions 2c and two first grooves 2d are alternately distributed along the circumference of the mounting hole 1a. Multiple second cover plates are disposed on the side of the first cover plate 21 facing away from the mounting hole 1a. On one side of the mounting hole 1a, multiple second cover plates 22 have the same shape and size, and every two second cover plates 22 correspond to one first cover plate 21. The edge lines of the two second cover plates 22 on opposite sides are flush with the side edge lines of the first cover plate 21, and the edge lines are set radially along the mounting hole 1a. The second cover plate 22 includes multiple plates 221, which are arranged sequentially along the radial direction of the mounting hole 1a. The plates 221 and the first cover plate 21, as well as the plates 221 adjacent to each other along the radial direction of the mounting hole 1a, are mutually fitted by the first protrusion 2c and the first groove 2d.

[0044] Secondly, this utility model also provides an impeller, including the aforementioned rear cover plate device.

[0045] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A rear cover plate device, characterized in that, include: The frame is equipped with mounting holes; and Multiple cover plates are disposed on one side of the frame and connected to the frame. The multiple cover plates are distributed circumferentially and radially along the mounting holes, and the multiple cover plates are spliced ​​together to form a ring.

2. The rear cover plate device according to claim 1, characterized in that, Along the radial direction of the mounting hole, adjacent cover plates come into contact to form a first joint, the first joint extending at least partially along the radial direction of the mounting hole.

3. The rear cover plate device according to claim 1, characterized in that, Along the circumference of the mounting hole, adjacent cover plates contact each other to form a second joint, the second joint being arranged along the circumference of the mounting hole.

4. The rear cover plate device according to claim 2, characterized in that, Along the radial direction of the mounting hole, at least one of the two adjacent cover plates is formed with a first protrusion and the other is formed with at least one first groove, the first protrusion engaging with the first groove.

5. The rear cover plate device according to claim 4, characterized in that, Along the radial direction of the mounting hole, each of the two adjacent cover plates is provided with a first protrusion and a first groove, and the first protrusion and the first groove of the two adjacent cover plates are interlocked.

6. The rear cover plate device according to claim 1, characterized in that, It also includes a connector that connects the cover plate and the frame.

7. The rear cover plate device according to claim 6, characterized in that, The cover plate has a countersunk hole, and the connector includes a screw. The threaded end of the screw passes through the countersunk hole and is threadedly connected to the skeleton.

8. The rear cover plate device according to claim 7, characterized in that, The connector also includes a plug and an adhesive layer. The plug is disposed in the countersunk hole and on the side of the countersunk hole screw away from the skeleton. The adhesive layer is built into the countersunk hole and connects the plug, screw and the inner wall of the countersunk hole.

9. The rear cover plate device according to claim 8, characterized in that, The outer diameter of the plug gradually decreases in the direction away from the screw.

10. An impeller, characterized in that, Includes the rear cover plate device as described in any one of claims 1-9.

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