Centrifugal pump diffuser

Abstract

The utility model discloses a centrifugal pump diffuser, which belongs to the technical field of centrifugal pumps, and comprises a diffuser base, a diffuser top plate is arranged on one side of the diffuser base, a plurality of guide vanes are uniformly arranged on the diffuser top plate, the plurality of guide vanes are arranged in a circumferential array, and a flow channel is formed between every two adjacent guide vanes. Notches are formed in the positions, corresponding to the guide vanes, of the diffuser top plate, clamping blocks are arranged in the notches, the clamping blocks are fixedly connected with the bottoms of the guide vanes, clamping openings are formed in the positions, corresponding to the notches, of the diffuser base, and the clamping blocks are fixedly connected with the bottoms of the guide vanes. And a fastener for fixing the clamping block is arranged in the bayonet, so that the damaged part of the diffuser can be replaced, the overall maintenance cost is reduced, the replacement is simple, and the maintenance efficiency is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, and more specifically to a centrifugal pump diffuser. Background Art

[0002] The National Energy Administration plans to increase the proportion of clean energy (natural gas, hydrogen, etc.) in energy consumption growth to 80% during the 14th Five-Year Plan period. In recent years, natural gas, as the cleanest fossil energy, has become one of the three indispensable pillar energy sources. Liquefied natural gas (LNG) has the advantages of high energy density, energy saving, environmental protection, safety and reliability. With the popularization of LNG and the rapid development of the industrial chain, LNG filling stations have put forward higher performance requirements for LNG filling equipment, among which centrifugal pumps are an indispensable part of LNG filling equipment.

[0003] In actual use, the existing centrifugal pump reduces the pressure of the high-speed fluid flowing through the diffuser through the rotation of the diffuser. However, the scouring of the high-speed fluid may cause damage to the surface of the diffuser, as well as the guide vanes and flow channels of the diffuser. When the diffuser is damaged and cannot be replaced in time, the fluid passing through the diffuser cannot be reduced to an appropriate pressure, which makes it impossible to implement subsequent steps. However, if the existing diffuser is damaged, the entire diffuser must be replaced, which makes the undamaged part of the diffuser unusable, increasing the overall cost. A solution to the above problem is proposed below. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a centrifugal pump diffuser, which can replace the damaged part of the diffuser, reduce the overall maintenance cost, and is simple to replace, thereby ensuring maintenance efficiency.

[0005] To solve the above problems, the utility model adopts the following technical solutions.

[0006] A centrifugal pump diffuser comprises a diffuser base, a diffuser top plate is arranged on one side of the diffuser base, a plurality of guide vanes are evenly arranged on the diffuser top plate, the guide vanes are arranged in a circular row, a flow channel is formed between two adjacent guide vanes, and the cross-sectional diameter of one end of the flow channel close to the diffuser top plate is smaller than the cross-sectional diameter of the other end of the guide vane, and the flow channel is arc-shaped, a notch is provided on the diffuser top plate at a position corresponding to the guide vane, a clamping block is provided inside the notch, the clamping block is fixedly connected to the bottom of the guide vane, a clamping socket is provided at a position corresponding to the notch on the diffuser base, and a fastener for fixing the clamping block is provided inside the clamping socket.

[0007] Preferably, the fastener includes a top block and a locking block, a placement groove is provided on one side of the bayonet, the locking block is slidably arranged inside the placement groove, and the moving direction of the locking block is parallel to the plane where the placement groove is located, the top block is located on the side of the locking block away from the bayonet, and the bayonet and the placement groove are slidably matched, and the moving direction of the bayonet is perpendicular to the plane where the placement groove is located, and the end of the top block close to the locking block is an inclined surface.

[0008] Preferably, a fastening opening is provided on a side of the clamping block close to the fastener, and the fastening opening and the fastener are plugged and fixed.

[0009] Preferably, the placement groove is symmetrical and has a horizontally arranged guide groove, a guide block is slidably arranged inside the guide groove, the guide block is fixedly connected to the locking block, the placement groove is symmetrically and vertically arranged with a movable groove, a movable block is slidably arranged inside the movable groove, and the movable block is fixedly connected to the top block.

[0010] Preferably, a plurality of countersunk holes are evenly formed on the diffuser top plate, screws are arranged inside the countersunk holes, and the screws are threadably matched with the diffuser base.

[0011] Preferably, a plurality of sealing gaskets are provided between the guide vanes and the diffuser top plate, and the sealing gaskets and the guide vanes are fixedly connected.

[0012] Preferably, a first mounting opening is opened in the middle of the diffuser base, and a second mounting opening is opened in the middle of the diffuser top plate. The first mounting opening and the second mounting opening are concentric, and a diameter of the first mounting opening is greater than a diameter of the second mounting opening.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1. This solution connects the diffuser base with an external centrifugal pump, and a high-speed liquid flow enters the flow channel along the direction of rotation. The diameter of one end of the flow channel is larger than the diameter of the other end, and the flow channel is designed in an arc shape. Through the speed reduction and pressure diffusion of the guide vane and the flow channel, when one of the guide vanes is damaged, the user can separate the diffuser top plate and the diffuser base, thereby removing the pressure on the diffuser top plate on the fastener, so that the fastener removes the restriction on the block, that is, the guide vane can be disassembled for maintenance and replacement, which is convenient for operation and can avoid the increased cost caused by overall replacement.

[0015] Second, by fitting the diffuser top plate and the diffuser base, the diffuser top plate will push the top block to move, and the top block will move toward the inside of the placement slot. At the same time, the inclined surface of the top block will push the locking block, and the inclined surface will push the locking block to move horizontally. The horizontally moving locking block will move toward the inside of the bayonet, so that the locking block will act on the card block, and the card block will be fixed by the locking block, thereby completing the installation of the guide vane.

[0016] Third, the fastening opening and the locking block can cooperate with each other, so that the fixing of the locking block to the card block is converted into a card connection through friction, thereby ensuring the stability of the position of the card block and avoiding deviation.

[0017] 4. The cooperation between the guide groove and the guide block limits the movement of the locking block, so that the locking block can only move parallel to the plane of the placement groove, and the guide blocks are symmetrically arranged to ensure the stability of the movement. The cooperation between the moving groove and the moving block limits the movement of the top block, so that the top block can move in a direction perpendicular to the placement groove.

[0018] 5. Fix the diffuser base and diffuser top plate with screws. Meanwhile, the countersunk holes can ensure that the screws are received inside the countersunk holes to ensure the flatness of the diffuser top plate.

[0019] 6. The sealing gasket seals the guide vane and the diffuser top plate, and at the same time avoids direct rigid contact between the guide vane and the diffuser top plate, thereby ensuring the service life of the guide vane and the diffuser top plate.

[0020] 7. The first mounting opening and the second mounting opening can be used to facilitate external installation, and the diameter of the first mounting opening is larger than the diameter of the second mounting opening. The first mounting opening and the second mounting opening can form a step shape to ensure the stability of the diffuser base and the diffuser top plate when installed externally. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0022] Figure 2 It is a schematic diagram of the structure of the top view of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the front view of the utility model;

[0024] Figure 4 It is a structural schematic diagram of a cross-sectional view of the front view of the utility model;

[0025] Figure 5 It is a cross-sectional structural diagram of a top view of the bayonet and placement slot of the utility model;

[0026] Figure 6 It is a cross-sectional structural schematic diagram of the front view of the bayonet and the placement groove of the utility model.

[0027] Description of the numbers in the figure:

[0028] 1. Diffuser base; 2. Diffuser top plate; 3. Guide vane; 4. Flow channel; 5. Notch; 6. Block; 7. Bayonet; 8. Fastener; 9. Top block; 10. Lock block; 11. Placement groove; 12. Inclined surface; 13. Fastening mouth; 14. Guide groove; 15. Guide block; 16. Moving groove; 17. Moving block; 18. Countersunk hole; 19. Screw; 20. Sealing gasket; 21. First mounting port; 22. Second mounting port. DETAILED DESCRIPTION

[0029] Embodiment 1:

[0030] See also Figure 1-6 A centrifugal pump diffuser includes a diffuser base 1, a diffuser top plate 2 is arranged on one side of the diffuser base 1, three countersunk holes 18 are evenly opened on the diffuser top plate 2, the three countersunk holes 18 are arranged in a circle, screws 19 are arranged inside the countersunk holes 18, the screws 19 and the diffuser base 1 are threadedly matched, the diffuser base 1 and the diffuser top plate 2 are fixed by the screws 19, and the countersunk holes 18 can ensure that the screws 19 are received inside the countersunk holes 18 to ensure the flatness of the diffuser top plate 2, and the middle part of the diffuser base 1 is opened There is a first mounting opening 21, and a second mounting opening 22 is opened in the middle of the diffuser top plate 2. The first mounting opening 21 and the second mounting opening 22 are concentric, and the diameter of the first mounting opening 21 is larger than the diameter of the second mounting opening 22. The first mounting opening 21 and the second mounting opening 22 can be conveniently installed with the outside, and the diameter of the first mounting opening 21 is larger than the diameter of the second mounting opening 22. The first mounting opening 21 and the second mounting opening 22 can form a step shape to ensure the stability of the diffuser base 1 and the diffuser top plate 2 when installed with the outside.

[0031] A plurality of guide vanes 3 are evenly arranged on the diffuser top plate 2, and a plurality of sealing gaskets 20 are arranged between the guide vanes 3 and the diffuser top plate 2. The sealing gaskets 20 and the guide vanes 3 are fixedly connected, and the sealing gaskets 20 play the role of sealing the guide vanes 3 and the diffuser top plate 2, and can avoid direct rigid contact between the guide vanes 3 and the diffuser top plate 2, thereby ensuring the service life of the guide vanes 3 and the diffuser top plate 2. A plurality of guide vanes 3 are arranged in a circular row, and a flow channel 4 is formed between two adjacent guide vanes 3. The countersunk hole 18 is located inside the flow channel 4, which is convenient for operating the screw 19, and the cross-sectional diameter of one end of the flow channel 4 close to the diffuser top plate 2 is smaller than the cross-sectional diameter of the other end of the guide, and the flow channel 4 is arc-shaped, and the high-speed liquid flow enters the flow channel 4 along the direction of rotation, and the diameter of one end of the flow channel 4 is larger than the diameter of the other end, and the flow channel 4 is designed in an arc shape, and the speed is reduced and diffused through the guide vanes 3 and the flow channel 4.

[0032] A notch 5 is provided on the diffuser top plate 2 at a position corresponding to the guide vane 3, a clamping block 6 is provided inside the notch 5, the clamping block 6 is fixedly connected to the bottom of the guide vane 3, a clamping socket 7 is provided on the diffuser base 1 at a position corresponding to the notch 5, one end of the clamping block 6 is located inside the clamping socket 7, a fastener 8 for fixing the clamping block 6 is provided inside the clamping socket 7, a fastening opening 13 is provided on one side of the clamping block 6 close to the fastener 8, and the fastening opening 13 and the fastener 8 are plugged and fixed.

[0033] When one of the guide vanes 3 is damaged, the user can separate the diffuser top plate 2 and the diffuser base 1 to remove the pressure on the fastener 8 of the diffuser top plate 2, so that the fastener 8 removes the restriction on the block 6, that is, the guide vane 3 can be disassembled for maintenance and replacement, which is convenient for operation and can avoid the increased cost caused by overall replacement.

[0034] The fastener 8 includes a top block 9 and a locking block 10. A placement groove 11 is provided on one side of the bayonet 7. The locking block 10 is slidably arranged inside the placement groove 11, and the moving direction of the locking block 10 is parallel to the plane where the placement groove 11 is located. The top block 9 is located on the side of the locking block 10 away from the bayonet 7, and the bayonet 7 and the placement groove 11 are slidably matched, and the moving direction of the bayonet 7 is perpendicular to the plane where the placement groove 11 is located. The placement groove 11 is symmetrical and has a horizontally arranged guide groove 14. A guide block 15 is slidably provided inside the guide groove 14. The guide block 15 is fixedly connected to the locking block 10. The inside of the placement groove 11 A movable groove 16 is symmetrically and vertically arranged, and a movable block 17 is slidably arranged inside the movable groove 16. The movable block 17 is fixedly connected to the top block 9. The cooperation of the guide groove 14 and the guide block 15 limits the movement of the locking block 10, so that the locking block 10 can only move parallel to the plane of the placement groove 11, and the guide block 15 is symmetrically arranged to ensure the stability of the movement. The cooperation of the movable groove 16 and the movable block 17 limits the movement of the top block 9, so that the top block 9 can move in a direction perpendicular to the placement groove 11. The end of the top block 9 close to the locking block 10 is a slope 12

[0035] By fitting the diffuser top plate 2 and the diffuser base 1, the diffuser top plate 2 pushes the top block 9 to move, and the top block 9 moves toward the inside of the placement groove 11. At the same time, the inclined surface 12 of the top block 9 pushes the locking block 10, and the inclined surface 12 pushes the locking block 10 to move horizontally. The horizontally moving locking block 10 moves toward the inside of the bayonet 7, so that the locking block 10 acts on the card block 6, and the card block 6 is fixed by the locking block 10, thereby completing the installation of the guide vane 3.

[0036] Working principle:

[0037] When in use, the first mounting port 21 and the second mounting port 22 mount the diffuser base 1 and the diffuser top plate 2 on the centrifugal pump, so that when the high-speed liquid flows into the flow channel 4 along the direction of rotation, the diameter of one end of the flow channel 4 is larger than the diameter of the other end, and the flow channel 4 is designed to be arc-shaped, and the speed reduction and pressure diffusion are achieved through the guide vanes 3 and the flow channel 4, thereby achieving the effect of pressure reduction.

[0038] When some parts of this product are damaged after long-term use, only the damaged parts can be replaced without replacing the entire part, thereby reducing costs. The specific operation is as follows: by unscrewing the screw 19, the screw 19 will remove the fixation between the diffuser top plate 2 and the diffuser base 1, thereby completing the separation between the diffuser top plate 2 and the diffuser base 1. When the pressure of the diffuser top plate 2 on the diffuser base 1 is reduced, the pressure on the top block 9 will be removed, so that the pressure of the inclined surface 12 of the top block 9 on the locking block 10 is reduced, that is, the locking block 10 can slide out from the inside of the fastening port 13, thereby removing the restriction of the locking block 10 on the card block 6, that is, the card block 6 can be moved out of the recess 5 and the card slot 7, that is, the separation between the guide vane 3 and the diffuser top plate 2 is realized, and the steps are repeated until all the guide vanes 3 are separated from the diffuser top plate 2, thereby realizing the complete disassembly of this product. The user can partially replace the damaged part according to the actual situation, without replacing all of it, thereby reducing costs, and the replacement operation is simple without the need for cumbersome steps.

Claims

1. A centrifugal pump diffuser, characterized in that: The invention comprises a diffuser base (1), a diffuser top plate (2) is arranged on one side of the diffuser base (1), a plurality of guide vanes (3) are evenly arranged on the diffuser top plate (2), the plurality of guide vanes (3) are arranged in a circular row, a flow channel (4) is formed between two adjacent guide vanes (3), the cross-sectional diameter of one end of the flow channel (4) close to the diffuser top plate (2) is smaller than the cross-sectional diameter of the other end of the flow channel, and the flow channel (4) is arc-shaped, a notch (5) is provided on the diffuser top plate (2) at a position corresponding to the guide vane (3), a clamping block (6) is provided inside the notch (5), the clamping block (6) is fixedly connected to the bottom of the guide vane (3), a clamping socket (7) is provided on the diffuser base (1) at a position corresponding to the notch (5), and a fastener (8) for fixing the clamping block (6) is provided inside the clamping socket (7).

2. A centrifugal pump diffuser according to claim 1, characterized in that: The fastener (8) comprises a top block (9) and a locking block (10); a placement groove (11) is provided on one side of the bayonet (7); the locking block (10) is slidably arranged inside the placement groove (11); and the moving direction of the locking block (10) is parallel to the plane where the placement groove (11) is located; the top block (9) is located on the side of the locking block (10) away from the bayonet (7); the bayonet (7) and the placement groove (11) are slidably matched; and the moving direction of the bayonet (7) is perpendicular to the plane where the placement groove (11) is located; and one end of the top block (9) close to the locking block (10) is an inclined surface (12).

3. A centrifugal pump diffuser according to claim 1, characterized in that: A fastening opening (13) is provided on one side of the clamping block (6) close to the fastener (8), and the fastening opening (13) and the fastener (8) are plugged and fixed.

4. A centrifugal pump diffuser according to claim 2, characterized in that: The placement groove (11) is symmetrical and has a horizontally arranged guide groove (14), a guide block (15) is slidably arranged inside the guide groove (14), and the guide block (15) is fixedly connected to the locking block (10). The placement groove (11) is symmetrically and vertically arranged inside and has a moving groove (16), a moving block (17) is slidably arranged inside the moving groove (16), and the moving block (17) is fixedly connected to the top block (9).

5. A centrifugal pump diffuser according to claim 1, characterized in that: A plurality of countersunk holes (18) are evenly arranged on the diffuser top plate (2), screws (19) are arranged inside the countersunk holes (18), and the screws (19) are threadably matched with the diffuser base (1).

6. A centrifugal pump diffuser according to claim 1, characterized in that: A plurality of sealing gaskets (20) are arranged between the guide vanes (3) and the diffuser top plate (2), and the sealing gaskets (20) and the guide vanes (3) are fixedly connected.

7. A centrifugal pump diffuser according to claim 1, characterized in that: A first mounting opening (21) is provided in the middle of the diffuser base (1), and a second mounting opening (22) is provided in the middle of the diffuser top plate (2); the first mounting opening (21) and the second mounting opening (22) are concentric, and the diameter of the first mounting opening (21) is greater than the diameter of the second mounting opening (22).

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