Screw pump sealing assembly

Abstract

The utility model discloses a screw pump sealing assembly, which relates to the technical field of screw pump sealing and comprises a shaft sleeve, a pump shaft is nested in the shaft sleeve, a first sealing ring is arranged between the inner wall of the left portion of the shaft sleeve and the pump shaft, an annular protruding portion is arranged at the left end of the shaft sleeve, an annular groove is formed in the right side of the annular protruding portion, and a second sealing ring is arranged in the annular groove. A plurality of positioning columns are fixed to the inner wall of the left side of the annular groove, and the right end of the shaft sleeve is sleeved with a locking assembly. And the movable ring is embedded in the annular groove, the positioning column is embedded in the movable ring, and a second sealing ring is arranged between the circumferential outer wall of the movable ring and the inner wall of the annular groove. The first sealing ring is arranged between the shaft sleeve and the pump shaft, the sealing performance between the shaft sleeve and the pump shaft is improved, the movable ring is embedded in the annular groove of the annular protruding part, accurate installation of the movable ring is achieved through the positioning column and the positioning hole, the concentricity of the movable ring and the shaft sleeve is guaranteed, sealing failure caused by eccentric wear is prevented, and the sealing effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of screw pump sealing technology, and specifically to a screw pump sealing assembly. Background Technology

[0002] A screw pump is a type of pump that uses the rotation of helical blades to propel water upwards in a spiral motion along the axis. It consists of a shaft, helical blades, and a casing. During pumping, the pump is placed at an angle in the water, with the angle of the pump shaft smaller than the angle of the helical blades, and the lower end of the helical blades in contact with the water. When the prime mover drives the screw pump shaft to rotate via a speed-changing device, water enters the blades and rises along the spiral flow path until it exits. It has a simple structure, is easy to manufacture, has a large flow rate, low head loss, high efficiency, and is easy to maintain and repair.

[0003] Currently, the sealing components of existing screw pumps have many parts, making installation cumbersome and inconvenient for later disassembly and maintenance. The sealing performance between the shaft sleeve and the pump shaft is relatively poor, which can easily lead to axial leakage of the medium. Furthermore, the installation between the rotating ring and the shaft sleeve is complicated, making it difficult to accurately ensure the concentricity of the rotating ring and the shaft sleeve. Utility Model Content

[0004] The purpose of this invention is to provide a screw pump sealing assembly to address the aforementioned shortcomings in the technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a screw pump sealing assembly, comprising:

[0006] A bushing, in which a pump shaft is nested, a first sealing ring is provided between the left inner wall of the bushing and the pump shaft, an annular protrusion is provided at the left end of the bushing, an annular groove is provided on the right side of the annular protrusion, a plurality of positioning pins are fixed on the left inner wall of the annular groove, and a locking assembly is sleeved on the right end of the bushing.

[0007] A moving ring is nested in an annular groove, and a positioning pin is nested in the moving ring. A second sealing ring is provided between the outer circumferential wall of the moving ring and the inner wall of the annular groove.

[0008] A stationary ring seat is fitted onto the right side of the bushing. A pressure cap is fitted onto the right end of the stationary ring seat, and a stationary ring is nested at the left end of the stationary ring seat. The stationary ring abuts against the moving ring. Multiple compensating springs are provided between the left side of the pressure cap and the stationary ring seat.

[0009] Preferably, the annular protrusion and the bushing are integrally machined to reduce the number of assembly parts and lower the risk of seal failure due to welding or bolt connection.

[0010] Preferably, the end of the rotating ring away from the stationary ring has a positioning hole at the position corresponding to the positioning post, and the positioning post is nested in the corresponding positioning hole to ensure the concentricity of the rotating ring and the bushing and prevent seal failure caused by uneven wear.

[0011] Preferably, the end of the rotating ring near the stationary ring extends to the outside of the annular groove, and the end of the stationary ring near the rotating ring extends to the outside of the stationary ring seat. The stationary ring is sleeved on the bushing, and a third sealing ring is provided between the outer wall of the stationary ring and the inner wall of the stationary ring seat to increase the sealing contact area and improve the sealing performance under high pressure conditions. The third sealing ring forms a secondary sealing barrier to prevent the medium from leaking from the gap of the stationary ring seat.

[0012] Preferably, the left circumference of the pressure cap is evenly provided with multiple spring mounting holes, the compensating spring is nested in the corresponding spring mounting holes, and the end of the compensating spring extending out of the spring mounting hole abuts against the stationary ring seat, so as to realize the uniform preload distribution of the compensating spring and avoid stress concentration at a single point.

[0013] Preferably, multiple guide posts are evenly fixed on the left circumference of the pressure cap, and guide holes are opened on the stationary ring seat at the positions corresponding to the guide posts. The end of the guide post away from the pressure cap is slidably nested in the guide hole to ensure that the pressure cap and the stationary ring seat are axially aligned and to prevent the compensation spring from deflecting when compressed.

[0014] Preferably, a fourth sealing ring is provided between the gland and the stationary ring seat to block potential leakage paths between the gland and the stationary ring seat, forming a complete sealing chain.

[0015] Preferably, the locking assembly includes a locking ring and two locking rings. The locking ring is fitted onto the right end of the bushing. The outer side of the locking ring has a triangular surface. The two locking rings are respectively fitted onto the two beveled surfaces of the triangular surface of the locking ring. The two locking rings are connected by hexagonal bolts. The beveled surfaces of the double locking rings produce a self-tightening effect to adapt to the thermal expansion and contraction of the bushing. The triangular surface design increases the contact stress and prevents axial loosening.

[0016] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0017] 1. By providing a first sealing ring between the bushing and the pump shaft, the sealing performance between the bushing and the pump shaft is improved. The moving ring is nested in the annular groove of the annular protrusion, and the precise installation of the moving ring is achieved through the positioning pin and positioning hole, ensuring the concentricity of the moving ring and the bushing, preventing seal failure caused by uneven wear, and ensuring the sealing effect.

[0018] 2. The annular protrusion and the bushing are integrally machined, reducing the number of assembly parts and lowering the risk of seal failure due to welding or bolting connections;

[0019] 3. This sealing assembly has few parts, making it simple and convenient to install, maintain, and replace. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This utility model Figure 1 Enlarged schematic diagram of part A;

[0023] Figure 3 This is a sectional view of the bushing of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Pump shaft; 2. Shaft sleeve; 3. First sealing ring; 4. Annular protrusion; 5. Annular groove; 6. Positioning pin; 7. Moving ring; 8. Second sealing ring; 9. Stationary ring seat; 10. Gland; 11. Stationary ring; 12. Compensating spring; 13. Positioning hole; 14. Third sealing ring; 15. Guide pin; 16. Guide hole; 17. Fourth sealing ring; 18. Locking ring; 19. Locking ring. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0027] This utility model provides, for example Figures 1 to 3 The screw pump sealing assembly shown includes:

[0028] A bushing 2 is provided, and a pump shaft 1 is nested inside the bushing 2. A first sealing ring 3 is provided between the left inner wall of the bushing 2 and the pump shaft 1. An annular protrusion 4 is provided at the left end of the bushing 2. An annular groove 5 is provided on the right side of the annular protrusion 4. Multiple positioning pins 6 are fixed on the left inner wall of the annular groove 5. A locking assembly is sleeved on the right end of the bushing 2.

[0029] The moving ring 7 is nested in the annular groove 5, the positioning pin 6 is nested in the moving ring 7, and a second sealing ring 8 is provided between the outer circumference of the moving ring 7 and the inner wall of the annular groove 5.

[0030] The stationary ring seat 9 is sleeved on the right side of the bushing 2. The right end of the stationary ring seat 9 is fitted with a pressure cap 10. The left end of the stationary ring seat 9 is nested with a stationary ring 11, which abuts against the moving ring 7. Multiple compensating springs 12 are provided between the left side of the pressure cap 10 and the stationary ring seat 9.

[0031] The annular protrusion 4 and the bushing 2 are integrally machined, reducing the number of assembly parts and lowering the risk of seal failure due to welding or bolt connection.

[0032] The end of the rotating ring 7 away from the stationary ring 11 has a positioning hole 13 at the position corresponding to the positioning post 6. The positioning post 6 is nested in the corresponding positioning hole 13 to ensure the concentricity of the rotating ring 7 and the bushing 2 and prevent seal failure caused by uneven wear.

[0033] The end of the moving ring 7 near the stationary ring 11 extends to the outside of the annular groove 5, and the end of the stationary ring 11 near the moving ring 7 extends to the outside of the stationary ring seat 9. The stationary ring 11 is sleeved on the bushing 2. A third sealing ring 14 is provided between the outer wall of the stationary ring 11 and the inner wall of the stationary ring seat 9 to increase the sealing contact area and improve the sealing performance under high pressure conditions. The third sealing ring 14 forms a secondary sealing barrier to prevent the medium from leaking from the gap of the stationary ring seat 9.

[0034] Multiple spring mounting holes are evenly provided on the left circumference of the pressure cover 10. The compensating spring 12 is nested in the corresponding spring mounting hole. One end of the compensating spring 12 protruding from the spring mounting hole abuts against the stationary ring seat 9, so as to achieve a uniform preload distribution of the compensating spring 12 and avoid stress concentration at a single point.

[0035] Multiple guide posts 15 are evenly fixed on the left circumference of the pressure cap 10. Guide holes 16 are opened on the stationary ring seat 9 at the positions corresponding to the guide posts 15. The end of the guide post 15 away from the pressure cap 10 is slidably nested in the guide hole 16 to ensure that the pressure cap 10 and the stationary ring seat 9 are axially aligned and to prevent the compensation spring 12 from deflecting when compressed.

[0036] A fourth sealing ring 17 is provided between the gland 10 and the stationary ring seat 9 to block potential leakage paths between the gland 10 and the stationary ring seat 9, forming a complete sealing chain.

[0037] The locking assembly includes a locking ring 18 and two locking rings 19. The locking ring 18 is fitted onto the right end of the bushing 2. The outer side of the locking ring 18 has a triangular surface. The two locking rings 19 are respectively fitted onto the two beveled surfaces of the triangular surface of the locking ring 18. The two locking rings 19 are connected by hexagonal bolts. The beveled surfaces of the double locking rings 19 produce a self-tightening effect to adapt to the thermal expansion and contraction of the bushing 2. The triangular surface design increases the contact stress and prevents axial loosening.

[0038] In this invention, a first sealing ring 3 is provided between the left inner wall of the bushing 2 and the pump shaft 1, which improves the sealing performance between the bushing 2 and the pump shaft 1. The moving ring 7 is nested in the annular groove 5 of the annular protrusion 4, and the precise installation of the moving ring 7 is achieved through the positioning pin 6 and the positioning hole 13, ensuring the concentricity of the moving ring 7 and the bushing 2, preventing sealing failure caused by uneven wear, and ensuring the sealing effect. The annular protrusion 4 and the bushing 2 are integrally machined, reducing the number of assembly parts and reducing the risk of sealing failure caused by welding or bolt connection. Multiple guide pins 15 and compensation springs 12 are evenly provided on the left circumference of the pressure cover 10, which realizes the uniform preload distribution of the compensation spring 12 and avoids stress concentration at a single point. Under the elastic force of the compensation spring 12, the stationary ring 11 and the moving ring 7 are in close contact. The end of the guide pin 15 away from the pressure cover 10 is slidably nested in the guide hole 16, ensuring the axial alignment of the pressure cover 10 and the stationary ring seat 9, and preventing the compensation spring 12 from deflecting when compressed.

[0039] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A screw pump sealing assembly, characterized in that, include: A bushing (2) is provided with a pump shaft (1) nested inside the bushing (2). A first sealing ring (3) is provided between the left inner wall of the bushing (2) and the pump shaft (1). An annular protrusion (4) is provided at the left end of the bushing (2). An annular groove (5) is provided on the right side of the annular protrusion (4). Multiple positioning pins (6) are fixed on the left inner wall of the annular groove (5). A locking assembly is sleeved on the right end of the bushing (2). The moving ring (7) is nested in the annular groove (5), the positioning post (6) is nested in the moving ring (7), and a second sealing ring (8) is provided between the outer circumferential wall of the moving ring (7) and the inner wall of the annular groove (5). A stationary ring seat (9) is fitted onto the right side of the bushing (2). A pressure cap (10) is fitted onto the right end of the stationary ring seat (9). A stationary ring (11) is nested at the left end of the stationary ring seat (9). The stationary ring (11) abuts against the moving ring (7). Multiple compensating springs (12) are provided between the left side of the pressure cap (10) and the stationary ring seat (9).

2. The screw pump sealing assembly according to claim 1, characterized in that: The annular protrusion (4) and the bushing (2) are integrally machined.

3. The screw pump sealing assembly according to claim 1, characterized in that: The moving ring (7) has a positioning hole (13) on the end face away from the stationary ring (11) corresponding to the positioning post (6), and the positioning post (6) is nested in the corresponding positioning hole (13).

4. A screw pump sealing assembly according to claim 1, characterized in that: The moving ring (7) extends to the outside of the annular groove (5) at one end near the stationary ring (11), and the stationary ring (11) extends to the outside of the stationary ring seat (9) at one end near the moving ring (7). The stationary ring (11) is sleeved on the bushing (2), and a third sealing ring (14) is provided between the outer wall of the stationary ring (11) and the inner wall of the stationary ring seat (9).

5. A screw pump sealing assembly according to claim 1, characterized in that: The left circumference of the pressure cap (10) is evenly provided with multiple spring mounting holes, and the compensation spring (12) is nested in the corresponding spring mounting hole. The end of the compensation spring (12) extending out of the spring mounting hole abuts against the stationary ring seat (9).

6. A screw pump sealing assembly according to claim 1, characterized in that: Multiple guide posts (15) are evenly fixed on the left circumference of the pressure cap (10). A guide hole (16) is provided on the static ring seat (9) at the position corresponding to the guide post (15). The end of the guide post (15) away from the pressure cap (10) is slidably nested in the guide hole (16).

7. A screw pump sealing assembly according to claim 1, characterized in that: A fourth sealing ring (17) is provided between the pressure cap (10) and the stationary ring seat (9).

8. A screw pump sealing assembly according to claim 1, characterized in that: The locking assembly includes a locking ring (18) and two locking rings (19). The locking ring (18) is fitted onto the right end of the bushing (2). The outer side of the locking ring (18) has a triangular surface. The two locking rings (19) are respectively fitted onto the two slopes of the triangular surface of the locking ring (18). The two locking rings (19) are connected by hexagonal bolts.

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