Shaft seal structure of double suction pump

Abstract

A shaft seal structure of a double suction pump comprises a pump shaft, a shaft sleeve is installed on the pump shaft, a sealing frame is connected to the outer side of the shaft sleeve, a sealing cavity is formed in the sealing frame, a shaft sleeve baffle ring is arranged in the sealing cavity and connected to the shaft sleeve, a plurality of back blades are machined on the back face of the shaft sleeve baffle ring, and a sealing wheel is arranged on the side face of the shaft sleeve baffle ring. A plurality of sealing grooves are machined in the back face of the sealing wheel, a check ring is arranged between the sealing wheel and the shaft sleeve check ring, a sealing body is arranged on the outer side of the check ring, a first sealing ring is arranged between the sealing body and the sealing frame, and a key block, a sealing ring, a pressing ring and a conical sleeve are arranged on the side face of the sealing wheel. A pressing ring is arranged on the outer side of the conical sleeve, the inner ring of the pressing ring is matched with the outer side conical face of the conical sleeve, the pressing ring is connected with the periphery of the sealing ring through bolts, and a second sealing ring is arranged between the sealing ring and the shaft sleeve. According to the back blade dynamic sealing principle, the pressure in the sealing cavity is reduced, and then medium leakage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to a double-suction pump shaft seal structure. Background Art

[0002] When a double-suction pump is conveying muddy water containing sediment, if a mechanical seal is used for the shaft seal, the sediment will damage the dynamic and static rings of the mechanical seal, making it difficult to guarantee its service life. If a packing seal is used, the leakage will be large. Therefore, in applications where the medium contains a large amount of sediment, a shaft seal structure with a long service life and low leakage is required. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a double suction pump shaft seal structure in view of the above-mentioned deficiencies in the prior art. In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is:

[0004] A double-suction pump shaft seal structure includes a pump shaft, a shaft sleeve is installed on the pump shaft, a sealing frame is connected to the outer side of the shaft sleeve, a sealing cavity is provided between the sealing frame and the shaft sleeve, a shaft sleeve retaining ring is provided in the sealing cavity, the shaft sleeve retaining ring is connected to the shaft sleeve, a plurality of back blades are processed on the back of the shaft sleeve retaining ring, a sealing wheel is provided on the side of the shaft sleeve retaining ring, the sealing wheel is sleeved on the shaft sleeve, a plurality of sealing grooves are processed on the back of the sealing wheel, a retaining ring is provided between the sealing wheel and the shaft sleeve retaining ring, a sealing body is provided on the outer side of the retaining ring, the sealing body is connected to the sealing frame, a sealing ring is provided between the sealing body and the sealing frame, a key block and a sealing ring are provided on the side of the sealing wheel, the sealing ring is sleeved on the shaft sleeve, the key The two ends of the block are connected with the sealing wheel and the sealing ring. A positioning ring is provided on the outside of the key block, and the positioning ring is located between the sealing wheel and the sealing ring. A partition is provided on the outside of the positioning ring. The outer circle of the partition matches the inner diameter of the sealing body. The outer circle end face of the partition presses the sealing body. The side of the partition is connected to a sealing plate, and a pressure cover is provided on the side of the sealing plate. The pressure cover is connected to the sealing frame. A pressure ring and a tapered sleeve are provided on the side of the sealing ring. The pressure ring and the tapered sleeve are sleeved on the shaft sleeve. A clamping ring is provided on the outside of the tapered sleeve. The inner ring of the clamping ring matches the outer conical surface of the tapered sleeve. The clamping ring is connected to the periphery of the sealing ring by bolts and washers. A sealing ring 2 is provided between the sealing ring and the shaft sleeve.

[0005] Furthermore, two positioning blocks are provided on the shaft sleeve, and two mounting grooves are processed on the inner hole of the shaft sleeve retaining ring, and the mounting grooves are clamped on the positioning blocks.

[0006] Furthermore, a pressure ring is provided on the sealing wheel.

[0007] Furthermore, a sealing body extension portion is provided on the outer circumference of the sealing body, and the sealing body extension portion is connected to the end face of the sealing frame via screw 1.

[0008] Furthermore, a gland extension portion is provided on the outer circumference of the gland, and the gland extension portion is connected to the end face of the sealing frame via screw 2.

[0009] Furthermore, a convex surface is provided on the periphery of the retaining ring, the convex surface covers the sealing body, and the partition is pressed on the convex surface of the retaining ring.

[0010] Furthermore, the bottom of the key block is an arc surface, which cooperates with the outer cylindrical surface of the sleeve. The sealing wheel and the sealing ring are processed with connecting grooves, and the two ends of the key block are inserted into the connecting grooves of the sealing wheel and the sealing ring.

[0011] Furthermore, the sealing plate is made of wear-resistant rubber material.

[0012] Furthermore, a pad and a water baffle are provided on the bolt.

[0013] Furthermore, a notch is provided on the conical sleeve.

[0014] Compared with the prior art, the double-suction pump shaft seal structure of the utility model utilizes the back blade dynamic sealing principle to reduce the pressure in the sealing cavity, thereby reducing medium leakage, making it suitable for conveying muddy water media containing sediment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 It is a structural diagram of the shaft sleeve of the utility model;

[0017] Figure 3 This is a structural diagram of the shaft sleeve retaining ring of the utility model;

[0018] Figure 4 This is a schematic structural diagram of the sealing wheel of the utility model;

[0019] Figure 5 It is a cross-sectional view of the sealing wheel of the utility model;

[0020] Figure 6 This is a schematic structural diagram of the sealing ring of the utility model;

[0021] Figure 7 This is a schematic structural diagram of the positioning ring of the utility model;

[0022] Figure 8 This is a structural diagram of the tapered sleeve of the utility model;

[0023] Among them, 1. pump shaft, 2. sleeve, 3. sealing frame, 4. sleeve retaining ring, 5. positioning block, 6. mounting groove, 7. back blade, 8. sealing wheel, 9. sealing groove, 10. retaining ring, 11. sealing body, 12. sealing ring 1, 13. pressure ring, 14. screw 1, 15. key block, 16. sealing ring, 17. connecting groove, 18. positioning ring, 19. partition, 20. sealing plate, 21. pressure cover, 22. screw 2, 23. pressure ring, 24. tapered sleeve, 25. tightening ring, 26. bolt, 27. washer, 28. sealing ring 2, 29. spacer, 30. water retaining plate, 31. notch. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below.

[0025] like Figures 1 to 8 As shown, a double-suction pump shaft seal structure includes a pump shaft 1, a shaft sleeve 2 is installed on the pump shaft 1, a sealing frame 3 is connected to the outside of the shaft sleeve 2, a sealing cavity is provided between the sealing frame 3 and the shaft sleeve 2, a shaft sleeve retaining ring 4 is provided in the sealing cavity, the shaft sleeve retaining ring 4 is connected to the shaft sleeve 2, wherein, the shaft sleeve 2 is connected to two positioning blocks 5, the inner hole of the shaft sleeve retaining ring 4 is processed with two mounting grooves 6, the mounting grooves 6 are stuck on the positioning blocks 5, a plurality of back blades 7 are processed on the back of the shaft sleeve retaining ring 4, a sealing wheel 8 is provided on the side of the shaft sleeve retaining ring 4, the sealing wheel 8 is sleeved on the shaft sleeve 2, a plurality of sealing grooves 9 are processed on the back of the sealing wheel 8, a retaining ring 10 is provided between the sealing wheel 8 and the shaft sleeve retaining ring 4, a sealing body 11 is provided on the outside of the retaining ring 10, the sealing body 11 is connected to the sealing frame 3, the periphery of the sealing body 11 is fitted with the sealing frame 3, and a sealing ring 12 is provided between the sealing body 11 and the sealing frame 3.

[0026] In this embodiment, a pressure ring 13 is provided on the sealing wheel 8, and the pressure ring 13 presses the shaft sleeve retaining ring 4. At the same time, the pressure ring 13 separates the wheel surface of the sealing wheel 8 from the shaft sleeve retaining ring 4 to form a separation area. The retaining ring 10 and the sealing body 11 are arranged in the separation area. The outer circumference of the sealing body 11 is provided with a sealing body extension portion, and the sealing body extension portion is connected to the end face of the sealing frame 3 through a screw 14.

[0027] A key block 15 and a sealing ring 16 are provided on the side of the sealing wheel 8. The sealing ring 16 is sleeved on the shaft sleeve 2. The two ends of the key block 15 are connected to the sealing wheel 8 and the sealing ring 16. In this embodiment, the bottom of the key block 15 is an arc surface, which cooperates with the outer cylindrical surface of the shaft sleeve 2. The sealing wheel 8 and the sealing ring 16 are both processed with connecting grooves 17, and the two ends of the key block 15 are inserted into the connecting grooves 17 of the sealing wheel 8 and the sealing ring 16.

[0028] A positioning ring 18 is provided on the outside of the key block 15. The positioning ring 18 is located between the sealing wheel 8 and the sealing ring 16. A connecting groove is also provided on the positioning ring 18 to connect with the key block 15. The sealing ring 16 presses the sealing wheel 8 and the shaft sleeve retaining ring 4 through the key block 15.

[0029] A partition 19 is provided on the outside of the positioning ring 18, and the outer circle of the partition 19 matches the inner diameter of the sealing body 11. The outer circle end face of the partition 19 presses the sealing body 11. In this embodiment, a convex surface is provided around the retaining ring 10, and the convex surface covers the sealing body 11. The partition 19 is pressed on the convex surface of the retaining ring and then presses the sealing body 11. A sealing plate 20 is connected to the side of the partition 19. The sealing plate 20 is made of wear-resistant rubber material. A pressure cover 21 is provided on the side of the sealing plate 20, and the pressure cover 21 is connected to the sealing frame 3. In this embodiment, a pressure cover extension is provided on the outer circle periphery of the pressure cover 21, and the pressure cover extension is connected to the end face of the sealing frame 3 through screw 22.

[0030] The side of the sealing ring 16 is provided with a pressure ring 23 and a tapered sleeve 24, which are sleeved on the shaft sleeve 2, and the pressure ring 23 is pressed on the sealing ring 16. A clamping ring 25 is provided on the outside of the tapered sleeve 24, and the inner ring of the clamping ring 25 cooperates with the outer conical surface of the tapered sleeve 24. The clamping ring 25 is connected to the periphery of the sealing ring 16 by bolts 26 and washers 27, and a sealing ring 28 is provided between the sealing ring 16 and the shaft sleeve 2.

[0031] A pad 29 and a water baffle 30 are provided on the bolt 26 .

[0032] During the operation of the water pump, the shaft sleeve retaining ring 4 is connected with the positioning block 5 through the installation groove 6, so that the shaft sleeve retaining ring 4 rotates with the shaft sleeve 2. The rotation process of the several back blades 7 set on the shaft sleeve retaining ring 4 generates pressure to offset the pressure of the medium leakage, thereby reducing the pressure in the sealing chamber, thereby reducing medium leakage. The sealing ring 12 between the sealing body 11 and the sealing frame 3 plays a static sealing role. The sealing wheel 8, the positioning ring 18 and the sealing ring 16 are connected to each other through the key block 15 and transmit torque. When the bolt 26 is tightened, the clamping ring 25 acts through the conical surface of the inner hole to continuously press the tapered sleeve 24 inward until the sealing wheel 8, the positioning ring 18, the sealing ring 16 and the clamping ring 23 are fully positioned axially. The bolt 26 is further tightened. The tapered sleeve 24 is provided with a notch 31. As it is continuously tightened Under the force, the tapered sleeve 24 is deformed, so that it finally hugs the shaft sleeve 2, so that the sealing wheel 8, positioning ring 18, sealing ring 16, key block 15, pressure ring 23, tapered sleeve 24, clamping ring 25, pad 29, water baffle 30, bolt 26, and gasket 27 rotate together with the shaft sleeve 2. The several sealing grooves 9 provided on the sealing wheel 8 also generate a certain pressure through rotation, which further prevents medium leakage. At the same time, the sealing plate 20 made of wear-resistant rubber material seals the final weak leakage medium. The sealing ring 28 between the sealing ring 16 and the shaft sleeve 2 plays an axial sealing role. The water baffle 30 can prevent the weak leakage medium from splashing to the outside. When conveying muddy water medium containing sediment, the leakage is low. Only the sealing plate 20 needs to be replaced regularly. The other parts will not be damaged normally and have a long service life.

[0033] The present invention is not limited to the embodiments described. Those skilled in the art may make some modifications or changes without departing from the spirit or scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A double-suction pump shaft seal structure, comprising a pump shaft with a shaft sleeve mounted thereon, characterized in that: The outer side of the sleeve is connected to a sealing frame, a sealing cavity is provided between the sealing frame and the sleeve, a sleeve retaining ring is provided in the sealing cavity, the sleeve retaining ring is connected to the sleeve, and a plurality of back blades are processed on the back of the sleeve retaining ring, a sealing wheel is provided on the side of the sleeve retaining ring, the sealing wheel is sleeved on the sleeve, and a plurality of sealing grooves are processed on the back of the sealing wheel, a retaining ring is provided between the sealing wheel and the sleeve retaining ring, a sealing body is provided on the outer side of the retaining ring, the sealing body is connected to the sealing frame, a sealing ring is provided between the sealing body and the sealing frame, a key block and a sealing ring are provided on the side of the sealing wheel, the sealing ring is sleeved on the sleeve, and both ends of the key block are connected to the sealing wheel and the sealing ring Then, a positioning ring is provided on the outside of the key block, and the positioning ring is located between the sealing wheel and the sealing ring. A partition is provided on the outside of the positioning ring, and the outer circle of the partition matches the inner diameter of the sealing body. The outer circle end face of the partition presses the sealing body, and the side of the partition is connected to a sealing plate, and a pressure cover is provided on the side of the sealing plate, and the pressure cover is connected to the sealing frame. A pressure ring and a tapered sleeve are provided on the side of the sealing ring, and the pressure ring and the tapered sleeve are sleeved on the shaft sleeve. A clamping ring is provided on the outside of the tapered sleeve, and the inner ring of the clamping ring matches the outer conical surface of the tapered sleeve. The clamping ring is connected to the periphery of the sealing ring by bolts and washers, and a sealing ring 2 is provided between the sealing ring and the shaft sleeve.

2. A double-suction pump shaft seal structure according to claim 1, characterized in that: Two positioning blocks are arranged on the shaft sleeve, and two mounting grooves are processed on the inner hole of the shaft sleeve retaining ring, and the mounting grooves are clamped on the positioning blocks.

3. The double-suction pump shaft seal structure according to claim 1, characterized in that: A pressure ring is provided on the sealing wheel.

4. The double-suction pump shaft seal structure according to claim 1, characterized in that: The outer circumference of the sealing body is provided with a sealing body extension portion, which is connected to the end face of the sealing frame via screw 1.

5. The double-suction pump shaft seal structure according to claim 1, characterized in that: The outer circumference of the gland is provided with a gland extension portion, which is connected to the end surface of the sealing frame via a second screw.

6. The double-suction pump shaft seal structure according to claim 1, characterized in that: A convex surface is provided on the periphery of the retaining ring, the convex surface covers the sealing body, and the partition is pressed on the convex surface of the retaining ring.

7. The double-suction pump shaft seal structure according to claim 1, characterized in that: The bottom of the key block is an arc surface, which matches the outer cylindrical surface of the sleeve. The sealing wheel and the sealing ring are processed with connecting grooves, and the two ends of the key block are inserted into the connecting grooves of the sealing wheel and the sealing ring.

8. The double-suction pump shaft seal structure according to claim 1, characterized in that: The sealing plate is made of wear-resistant rubber material.

9. The double-suction pump shaft seal structure according to claim 1, characterized in that: A pad and a water baffle are provided on the bolt.

10. The double-suction pump shaft seal structure according to claim 1, characterized in that: The conical sleeve is provided with a notch.

Images