A mechanical seal structure for a submersible electric pump

Abstract

The present invention relates to the field of mechanical sealing facilities, and in particular to a mechanical sealing structure of a submersible electric pump, comprising a moving ring and a stationary ring, wherein the end face of the moving ring is pressed against the end face of the stationary ring, the outer surface of the stationary ring is wrapped with a rubber piece, and the rubber piece extends axially upward to form a groove, the side wall of the rubber piece is wrapped around the mating surface of the moving ring and the stationary ring, and the moving ring and the rubber piece are tightened. The present invention prevents mud and sand from entering, greatly prolongs the service life, and reduces wear during use.

Description

Technical Field

[0001] The invention relates to the field of mechanical sealing facilities, in particular to a mechanical sealing structure of a submersible electric pump. Background Art

[0002] A mechanical seal is a shaft sealing device for rotating machinery. Traditional mechanical seals on hydroelectric pumps include a stationary ring and a dynamic ring, which are directly matched end to end. This structure has the following problem: mud and sand easily enter the mating surfaces of the stationary ring and the dynamic ring, and mechanical seals are mainly damaged by this reason. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings existing in the background technology and to propose a mechanical seal structure for a submersible electric pump.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a mechanical seal structure of a submersible electric pump, including a dynamic ring and a static ring, the end face of the dynamic ring is pressed against the end face of the static ring, the outer surface of the static ring is wrapped with a rubber part, and the rubber part extends axially upward to form a groove, the side wall of the rubber part is wrapped around the mating surface of the dynamic ring and the static ring, and the dynamic ring and the rubber part are tightened.

[0005] Preferably, the rubber part includes a rubber sleeve wrapped around the outer surface of the static ring, the rubber sleeve extends axially upward to form a groove, the side wall of the rubber sleeve is wrapped around the mating surface of the dynamic ring and the static ring, a sealing ring is rotatably installed on the upper part of the side wall of the rubber sleeve, a rubber pad is fixedly installed on the inner wall of the sealing ring, and the dynamic ring is tightened in the rubber pad.

[0006] Preferably, a bearing cavity is opened on the upper part of the side wall of the rubber sleeve, and the sealing ring fits through the upper and lower end surfaces inside the bearing cavity. A guide ring is installed in the bearing cavity, and the guide ring is located on the outside of the sealing ring. The axis of the guide ring is colinear with the axis of the sealing ring, and a plurality of guide sleeves are slidably installed on the outer surface of the guide ring, and the guide sleeves are fixed to the sealing ring.

[0007] Preferably, the guide sleeve has an extension seat extending from the end surface of the sealing ring, an upper connecting frame extending upwardly from the end of the extension seat, and the end of the upper connecting frame is fixedly connected to the sealing ring, and a lower connecting frame extending downwardly from the end of the extension seat, and the end of the lower connecting frame is fixedly connected to the sealing ring, and the upper connecting frame, the lower connecting frame and the extension seat are integrally formed.

[0008] Preferably, main sealing grooves are formed at the edges of the upper and lower end surfaces of the inner part of the bearing cavity, and the upper and lower ends of the sealing ring are fitted onto the inner outer surface of the main sealing groove. An upper sealing convex ring is extended from the inner top surface of the upper main sealing groove, and the upper sealing convex ring is fitted and passes through the upper end surface of the sealing ring. A lower sealing convex ring is extended from the bottom surface of the lower main sealing groove, and the lower sealing convex ring is fitted and passes through the lower end surface of the sealing ring.

[0009] Preferably, a No. 1 auxiliary sealing groove is provided on the upper end face of the sealing ring, and the upper sealing convex ring is fitted into the interior of the No. 1 auxiliary sealing groove; a No. 2 auxiliary sealing groove is provided on the lower end face of the sealing ring, and the lower sealing convex ring is fitted into the interior of the No. 2 auxiliary sealing groove; and lubricating oil is applied between the main sealing groove and the sealing ring, between the No. 1 auxiliary sealing groove and the upper sealing convex ring, and between the lower sealing convex ring and the No. 2 auxiliary sealing groove.

[0010] Preferably, a connecting block is extended from the lower end face of the guide ring, and the number of the connecting blocks is multiple. The multiple connecting blocks are symmetrical with the center line of the guide ring as the center of the array. A notch is provided at the lower end of the guide sleeve for the connecting block to pass through. Three guide wheels are installed in a circular array on the inner outer surface of the guide sleeve, and the guide wheels are attached to the outer surface of the guide ring.

[0011] Preferably, three bearing grooves are provided in a circular array on the inner outer surface of the guide sleeve, a wheel axle is embedded in the inner part of the bearing groove, the guide wheel is rotatably embedded in the outer surface of the wheel axle, and the outer surface of the guide wheel is arranged in a circular arc.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The side wall of the stationary ring is wrapped with a rubber part and extended axially upward to form a groove, so that the formed side wall can wrap the matching surface of the stationary ring and the dynamic ring. The dynamic ring is slightly tightened with the rubber above the stationary ring, so that the matching surface is isolated from the outside world through the rubber to prevent mud and sand from entering, and the service life is greatly extended.

[0014] 2. When the stationary ring is rotating, the guide sleeve will rotate around the surface of the guide ring. At this time, the guide wheel will roll against the surface of the guide ring to assist the guide sleeve in rotating. When the stationary ring rotates and drives the rubber sleeve to rotate synchronously, the rubber pad tightened on the dynamic ring can remain stationary, thereby reducing wear during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a mechanical seal structure of a submersible electric pump of the present invention;

[0016] Figure 2 A cross-sectional view of a mechanical seal structure of a submersible electric pump according to the present invention;

[0017] Figure 3 A mechanical seal structure of a submersible electric pump according to the present invention Figure 2 A partial view of

[0018] Figure 4 It is a schematic diagram of a guide sleeve of a mechanical seal structure of a submersible electric pump of the present invention;

[0019] Figure 5 It is a schematic diagram of another viewing angle of a guide sleeve of a mechanical seal structure of a submersible electric pump of the present invention;

[0020] Figure 6 The present invention is a schematic diagram of a guide sleeve of a mechanical seal structure of a submersible electric pump.

[0021] In the figure: 1. dynamic ring; 2. rubber sleeve; 3. static ring; 4. guide ring; 5. guide sleeve; 6. load-bearing groove; 7. wheel axle; 8. guide wheel; 9. notch; 10. load-bearing cavity; 11. sealing ring; 12. upper sealing convex ring; 13. rubber pad; 14. extension seat; 15. upper connecting frame; 16. main sealing groove; 17. No. 1 auxiliary sealing groove; 18. No. 2 auxiliary sealing groove; 19. lower sealing convex ring; 20. connecting block; 21. lower connecting frame. Implementation

[0022] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0023] like Figure 1-Figure 6 The mechanical seal structure of a submersible electric pump shown in the figure includes a dynamic ring 1 and a static ring 3. The end face of the dynamic ring 1 is pressed against the end face of the static ring 3. The outer surface of the static ring 3 is wrapped with a rubber part, and the rubber part extends axially upward to form a groove. The side wall of the rubber part is wrapped around the matching surface of the dynamic ring 1 and the static ring 3, and the dynamic ring 1 and the rubber part are tightened.

[0024] The rubber part includes a rubber sleeve 2 wrapped around the outer surface of the static ring 3. The rubber sleeve 2 extends axially upward to form a groove. The side wall of the rubber sleeve 2 is wrapped around the matching surface of the dynamic ring 1 and the static ring 3. A sealing ring 11 is rotatably installed on the upper part of the side wall of the rubber sleeve 2. A rubber pad 13 is fixedly installed on the inner wall of the sealing ring 11. The sealing ring 11 plays a role in supporting the rubber pad 13. The dynamic ring 1 is tightened in the rubber pad 13. The rubber sleeve 2 plays a role in wrapping the matching surface of the dynamic ring 1 and the static ring 3.

[0025] A bearing cavity 10 is provided at the upper part of the side wall of the rubber sleeve 2, and a sealing ring 11 fits through the upper and lower end surfaces of the inner part of the bearing cavity 10. A guide ring 4 is installed in the bearing cavity 10, and the bearing cavity 10 serves to bear the guide ring 4. The guide ring 4 is located on the outer side of the sealing ring 11, and the axis of the guide ring 4 is colinear with the axis of the sealing ring 11. A plurality of guide sleeves 5 are slidably installed on the outer surface of the guide ring 4, and the guide sleeves 5 are fixed to the sealing ring 11. The guide sleeves 5 and the guide ring 4 serve to guide the movement trajectory of the sealing ring 11.

[0026] An extension seat 14 is extended from the end face of the guide sleeve 5 relative to the sealing ring 11, and an upper connecting frame 15 is extended upwardly and tilted from the end of the extension seat 14, and the end of the upper connecting frame 15 is fixedly connected to the sealing ring 11. A lower connecting frame 21 is extended downwardly and tilted from the end of the extension seat 14, and the end of the lower connecting frame 21 is fixedly connected to the sealing ring 11. The extension seat 14 serves to connect the upper connecting frame 15 and the lower connecting frame 21. The upper connecting frame 15, the lower connecting frame 21 and the extension seat 14 are integrally formed, and the upper connecting frame 15 and the lower connecting frame 21 serve to increase the connection surface with the sealing ring 11.

[0027] Main sealing grooves 16 are provided at the edges of the upper and lower end surfaces of the inner part of the bearing cavity 10, and the upper and lower ends of the sealing ring 11 are fitted to the inner outer surface of the main sealing groove 16. An upper sealing convex ring 12 is extended from the inner top surface of the main sealing groove 16 located at the upper part, and the upper sealing convex ring 12 is fitted and penetrates the upper end surface of the sealing ring 11. The main sealing groove 16 serves to improve the sealing between the sealing ring 11 and the bearing cavity 10. A lower sealing convex ring 19 is extended from the bottom surface of the main sealing groove 16 located at the lower part, and the lower sealing convex ring 19 is fitted and penetrates the lower end surface of the sealing ring 11.

[0028] A No. 1 auxiliary sealing groove 17 is provided on the upper end surface of the sealing ring 11, and the upper sealing convex ring 12 is fitted into the interior of the No. 1 auxiliary sealing groove 17. A No. 2 auxiliary sealing groove 18 is provided on the lower end surface of the sealing ring 11, and the lower sealing convex ring 19 is fitted into the interior of the No. 2 auxiliary sealing groove 18. The No. 1 auxiliary sealing groove 17 and the upper sealing convex ring 12 as well as the lower sealing convex ring 19 and the No. 2 auxiliary sealing groove 18 serve to improve the sealing performance between the sealing ring 11 and the main sealing groove 16. Lubricating oil is applied between the main sealing groove 16 and the sealing ring 11, between the No. 1 auxiliary sealing groove 17 and the upper sealing convex ring 12, and between the lower sealing convex ring 19 and the No. 2 auxiliary sealing groove 18, and the lubricating oil serves as a lubricant.

[0029] A connecting block 20 is extended from the lower end surface of the guide ring 4. There are multiple connecting blocks 20, which are symmetrical with the center line of the guide ring 4 as the center of the array. The connecting block 20 fixes the guide ring 4. A notch 9 is provided at the lower end of the guide sleeve 5 for the connecting block 20 to pass through. Three guide wheels 8 are installed in a circular array on the inner outer surface of the guide sleeve 5. The notch 9 allows the guide sleeve 5 to move on the guide ring 4 without being hindered by the connecting block 20. The guide wheel 8 fits the outer surface of the guide ring 4.

[0030] Three bearing grooves 6 are provided in a circular array on the inner outer surface of the guide sleeve 5, and a wheel axle 7 is embedded in the inner part of the bearing groove 6. The guide wheel 8 is rotatably embedded in the outer surface of the wheel axle 7. The bearing groove 6 supports the guide wheel 8, and the wheel axle 7 connects the guide wheel 8. The outer surface of the guide wheel 8 is set in a circular arc, which can adapt to the arc surface of the guide ring 4.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A mechanical seal structure for a submersible electric pump, comprising a dynamic ring (1) and a static ring (3), wherein the end surface of the dynamic ring (1) is pressed against the end surface of the static ring (3), and characterized in that: The outer surface of the stationary ring (3) is wrapped with a rubber piece, and the rubber piece extends axially upward to form a groove shape, and the side wall of the rubber piece is wrapped around the matching surface of the dynamic ring (1) and the stationary ring (3), and the dynamic ring (1) and the rubber piece are tightened; The rubber part comprises a rubber sleeve (2) wrapped around the outer surface of the stationary ring (3), the rubber sleeve (2) extending axially upward to form a groove, the side wall of the rubber sleeve (2) wrapped around the matching surface of the dynamic ring (1) and the stationary ring (3), a sealing ring (11) is rotatably mounted on the upper part of the side wall of the rubber sleeve (2), a rubber pad (13) is fixedly mounted on the inner wall of the sealing ring (11), and the dynamic ring (1) is tightened inside the rubber pad (13); A bearing cavity (10) is provided at the upper portion of the side wall of the rubber sleeve (2); the sealing ring (11) is fitted and penetrates the upper and lower end surfaces of the bearing cavity (10); a guide ring (4) is installed in the bearing cavity (10); the guide ring (4) is located outside the sealing ring (11); the axis of the guide ring (4) is colinear with the axis of the sealing ring (11); a plurality of guide sleeves (5) are slidably installed on the outer surface of the guide ring (4); the guide sleeves (5) are fixed to the sealing ring (11).

2. The mechanical seal structure of a submersible electric pump according to claim 1, characterized in that: The guide sleeve (5) is provided with a protruding seat (14) extending from an end surface thereof relative to the sealing ring (11); an upper connecting frame (15) is extended upwardly and tilted from the end of the protruding seat (14); the end of the upper connecting frame (15) is fixedly connected to the sealing ring (11); a lower connecting frame (21) is extended downwardly and tilted from the end of the protruding seat (14); the end of the lower connecting frame (21) is fixedly connected to the sealing ring (11); the upper connecting frame (15), the lower connecting frame (21) and the protruding seat (14) are integrally formed.

3. The mechanical seal structure of a submersible electric pump according to claim 1, characterized in that: The upper and lower end edges of the inner end surface of the bearing cavity (10) are both provided with main sealing grooves (16); the upper and lower end portions of the sealing ring (11) are fitted to the inner outer surface of the main sealing groove (16); an upper sealing convex ring (12) extends from the inner top surface of the upper main sealing groove (16); the upper sealing convex ring (12) fits through the upper end surface of the sealing ring (11); and a lower sealing convex ring (19) extends from the bottom surface of the lower main sealing groove (16); the lower sealing convex ring (19) fits through the lower end surface of the sealing ring (11).

4. The mechanical seal structure of a submersible electric pump according to claim 3, characterized in that: The upper end surface of the sealing ring (11) is provided with a first auxiliary sealing groove (17), the upper sealing convex ring (12) is fitted inside the first auxiliary sealing groove (17), the lower end surface of the sealing ring (11) is provided with a second auxiliary sealing groove (18), the lower sealing convex ring (19) is fitted inside the second auxiliary sealing groove (18), and lubricating oil is applied between the main sealing groove (16) and the sealing ring (11), between the first auxiliary sealing groove (17) and the upper sealing convex ring (12), and between the lower sealing convex ring (19) and the second auxiliary sealing groove (18).

5. The mechanical seal structure of a submersible electric pump according to claim 1, characterized in that: A connecting block (20) extends from the lower end surface of the guide ring (4), the connecting blocks (20) are in plurality, and the connecting blocks (20) are arranged symmetrically with the center line of the guide ring (4) as the center of the array. A notch (9) is provided at the lower end of the guide sleeve (5) for the connecting block (20) to pass through, and three guide wheels (8) are mounted in an annular array on the inner outer surface of the guide sleeve (5), and the guide wheels (8) are fitted to the outer surface of the guide ring (4).

6. The mechanical seal structure of a submersible electric pump according to claim 5, characterized in that: The inner outer surface of the guide sleeve (5) is provided with three bearing grooves (6) in an annular array, a wheel axle (7) is embedded in the inner part of the bearing groove (6), the guide wheel (8) is rotatably embedded in the outer surface of the wheel axle (7), and the outer surface of the guide wheel (8) is arranged in a circular arc.

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