CN221921437U - Centrifugal pump sealing device - Google Patents

Abstract

The utility model discloses a centrifugal pump sealing device, which belongs to the technical field of centrifugal pumps and comprises a packing gland, a rotation groove for a pump shaft to pass through is provided at the center of the packing gland, a first packing ring is provided on one side of the packing gland, a second packing ring is provided on one side of the first packing ring, a plurality of connecting components for connecting are respectively provided between the packing gland and the first packing ring and between the first packing ring and the second packing ring, a groove is provided at the bottom of the first packing ring, a push block for inserting into the groove and pressing the first packing ring inward is fixedly connected to the top of the second packing ring, the contact surfaces of the first packing ring and the second packing ring with the pump shaft are sealing surfaces, sealing components are provided on the two sealing surfaces, high sealing performance can be achieved and the packing ring can be conveniently removed for maintenance.

Description

Centrifugal pump sealing device

Technical Field

The utility model relates to the technical field of centrifugal pumps, and more specifically to a centrifugal pump sealing device.

Background Art

The centrifugal pump works by using the rotation of the impeller to make the water centrifugal. Before starting the water pump, the pump casing and the water suction pipe must be filled with water, and then the motor is started, so that the pump shaft drives the impeller and water to rotate at high speed. The water undergoes centrifugal motion and is thrown to the outer edge of the impeller, and flows into the water pressure pipeline of the water pump through the flow channel of the volute pump casing.

The shaft seal of a centrifugal pump is arranged in sequence through packing, packing ring and packing gland to seal the pump shaft and the casing. The design of a single-layer packing ring has a general sealing effect. Once the packing ring is worn during long-term use, it will cause packing leakage, resulting in packing waste and damage to the water pump motor. Due to the separate design between the packing ring and the packing gland, the damaged packing ring is not easy to remove from the inside of the centrifugal pump, which increases the complexity of maintenance. In response to the above problems, a solution is proposed below.

Utility Model Content

In view of the problems existing in the prior art, the purpose of the utility model is to provide a centrifugal pump sealing device, which can achieve high sealing performance and can be easily removed for maintenance.

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

A centrifugal pump sealing device comprises a packing gland, a rotation groove through which a pump shaft passes is provided at the center of the packing gland, a first packing ring is provided on one side of the packing gland, a second packing ring is provided on one side of the first packing ring, a plurality of connecting components are provided between the packing gland and the first packing ring and between the first packing ring and the second packing ring, a groove is provided at the bottom of the first packing ring, a push block is fixedly connected to the top of the second packing ring for being inserted into the groove to squeeze the first packing ring inward, the contact surfaces between the first packing ring and the second packing ring and the pump shaft are sealing surfaces, and sealing components are provided on the two sealing surfaces.

Preferably, the sealing component includes a sealing ring and a sealing groove, the sealing groove is opened on the sealing surface, and the sealing groove is an annular groove, and the cross section of the sealing groove is an isosceles trapezoid, the sealing ring is arranged inside the sealing groove, and the cross section of the sealing ring is circular.

Preferably, the connecting component includes a fixing ring and a connecting rope, and two fixing rings are provided. The two fixing rings are detachably connected to the corresponding first packing pressure ring, second packing pressure ring, and packing pressure cover, respectively, and the two ends of the connecting rope are fixedly matched with the two fixing rings, respectively.

Preferably, the groove is an annular groove, and the cross section of the groove is rectangular.

Preferably, the push block is an annular block, and the cross section of the push block is a right-angled trapezoid, and the inclined end of the push block is close to the sealing surface.

Preferably, a pressing block for applying force to the first packing pressure ring is fixedly connected to the bottom of the packing gland, and a sealing rubber pad is provided on the bottom edge of the packing gland.

Preferably, a connecting ear connected to the centrifugal pump casing by bolts is provided on the side of the packing gland.

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

1. The double-layer sealing design of the first packing pressure ring and the second packing pressure ring of this scheme can achieve a double-layer sealing effect, and the pressure between the first packing pressure ring and the pump shaft can be increased by the cooperation of the push block and the groove, thereby further improving the sealing performance. At the same time, the packing gland, the first packing pressure ring and the second packing pressure ring are connected into a whole through the connecting component, which is convenient for all to be taken out during maintenance, and can be partially replaced without complete replacement, thereby reducing costs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall cross-sectional structure of the present invention;

FIG2 is an enlarged structural schematic diagram of A of the present utility model;

FIG3 is an enlarged structural schematic diagram of B of the utility model;

FIG. 4 is a schematic structural diagram of a connecting component of the present invention.

Description of the numbers in the figure:

1. Packing gland; 2. Rotating groove; 3. First packing pressure ring; 4. Second packing pressure ring; 5. Connecting component; 6. Groove; 7. Push block; 8. Sealing surface; 9. Sealing component; 10. Sealing ring; 11. Sealing groove; 12. Fixing ring; 13. Connecting rope; 14. Pressure block; 15. Sealing rubber pad; 16. Connecting ear; 17. Centrifugal pump housing; 18. Pump shaft.

DETAILED DESCRIPTION

Embodiment 1:

Please refer to Figures 1-4, a centrifugal pump sealing device includes a packing gland 1, a side of the packing gland 1 is provided with a connecting ear 16 connected to the centrifugal pump housing 17 by bolts, a rotation groove 2 is opened at the center of the packing gland 1 for the pump shaft 18 to pass through, a sealing gasket 15 is provided at the bottom edge of the packing gland 1, and an annular pressure block 14 for applying force to the first packing pressure ring 3 is fixedly connected to the bottom of the packing gland 1.

A first packing pressure ring 3 is arranged on one side of the packing gland 1, and a second packing pressure ring 4 is arranged on one side of the first packing pressure ring 3. The first packing pressure ring 3 and the second packing pressure ring 4 are rubber rings. Four connecting components 5 arranged in a circumferential array and serving as a connection are respectively arranged between the packing gland 1 and the first packing pressure ring 3 and between the first packing pressure ring 3 and the second packing pressure ring 4. The connecting component 5 includes a fixing ring 12 and a connecting rope 13. The connecting rope 13 is a flexible steel wire rope. Two fixing rings 12 are arranged, and both ends of the connecting rope 13 are respectively fixedly matched with the two fixing rings 12. Bolts are passed through the two fixing rings 12, and the fixing ring 12 is detachably matched by the bolts respectively threadedly matched with the corresponding first packing pressure ring 3, the second packing pressure ring 4 and the packing gland 1.

The contact surface between the first packing press ring 3 and the second packing press ring 4 and the pump shaft 18 is a sealing surface 8. A sealing component 9 is provided on the two sealing surfaces 8. The sealing component 9 includes a sealing ring 10 and a sealing groove 11. The sealing groove 11 is opened on the sealing surface 8, and the sealing groove 11 is an annular groove, and the cross section of the sealing groove 11 is an isosceles trapezoid. The sealing ring 10 is arranged inside the sealing groove 11, and the cross section of the sealing ring 10 is circular. The sealing ring 10 is a rubber ring.

A groove 6 is provided at the bottom of the first packing press ring 3. The sealing component 9 on the first packing press ring 3 is positioned no more than the top of the groove 6 in the vertical direction. The groove 6 is an annular groove, and the cross section of the groove 6 is a rectangle. A push block 7 is fixedly connected to the top of the second packing press ring 4 for inserting into the groove 6 to squeeze the first packing press ring 3 inward. The push block 7 is an annular block, and the cross section of the push block 7 is a right-angled trapezoid, and the inclined end of the push block 7 is close to the sealing surface 8.

Working principle:

The double-layer design of the first packing pressure ring 3 and the second packing pressure ring 4 can improve the sealing performance. At the same time, the sealing ring 10 on the sealing surface 8 can improve the sealing performance and can be easily replaced after wear. The design of the groove 6 and the push block 7 can squeeze the sealing surface 8 of the first packing pressure ring 3 after installation, thereby increasing the sealing performance. The design of the connecting rope 13 and the fixing ring 12 can simultaneously remove the first packing pressure ring 3 and the second packing pressure ring 4 when the packing gland 1 is disassembled. At the same time, the detachable fit of the fixing ring 12 can facilitate the replacement of damaged parts without replacing all of them, thereby reducing costs.

Claims (7)

1. A centrifugal pump sealing device, characterized in that: including gland (1), swivel groove (2) that pump shaft (18) worn out are offered to centre of a circle department of gland (1), one side of gland (1) is provided with first packing clamping ring (3), one side of first packing clamping ring (3) is provided with second packing clamping ring (4), be provided with a plurality of connecting elements (5) that play the linking effect between gland (1) and first packing clamping ring (3) and second packing clamping ring (4) respectively between, recess (6) are offered to the bottom of first packing clamping ring (3), the top fixedly connected with of second packing clamping ring (4) is used for inserting inside push block (7) of inwards extrudeing first packing clamping ring (3) of recess (6), first packing clamping ring (3) and second packing clamping ring (4) are sealed face (8) with pump shaft (18) contact surface, two be provided with sealing element (9) on sealed face (8).

2. A centrifugal pump sealing device according to claim 1, wherein: the sealing component (9) comprises a sealing ring (10) and a sealing groove (11), the sealing groove (11) is formed in the sealing surface (8), the sealing groove (11) is an annular groove, the cross section of the sealing groove (11) is isosceles trapezoid, the sealing ring (10) is arranged inside the sealing groove (11), and the cross section of the sealing ring (10) is circular.

3. A centrifugal pump sealing device according to claim 2, wherein: the connecting component (5) comprises two fixing rings (12) and connecting ropes (13), wherein the two fixing rings (12) are detachably connected with the corresponding first packing pressing rings (3), second packing pressing rings (4) and packing gland (1) respectively, and two ends of each connecting rope (13) are fixedly matched with the two fixing rings (12) respectively.

4. A centrifugal pump sealing device according to claim 1, wherein: the groove (6) is an annular groove, and the cross section of the groove (6) is rectangular.

5. A centrifugal pump sealing device according to claim 1, wherein: the pushing block (7) is an annular block, the cross section of the pushing block (7) is in a right trapezoid shape, and the inclined surface end of the pushing block (7) is close to the sealing surface (8).

6. A centrifugal pump sealing device according to claim 1, wherein: the bottom of the packing gland (1) is fixedly connected with a pressing block (14) for applying force to the first packing press ring (3), and the bottom edge of the packing gland (1) is provided with a sealing rubber pad (15).

7. A centrifugal pump sealing device according to claim 1, wherein: the side surface of the packing gland (1) is provided with a connecting lug (16) which is connected with a centrifugal pump shell (17) through a bolt.