CN111322269A - Mechanical seal mouth ring for lubricating grease of centrifugal pump - Google Patents

Abstract

The invention relates to a grease lubricated mechanical seal port ring of a centrifugal pump, which consists of a pump volute casing 2, an impeller body 25, a pump cover body 8, a fixed ring 16, a fixed ring corrugated groove surface 10, a moving ring 15, and a connecting surface of the moving ring impeller 17. The moving ring impeller connecting step 19, the oil supply hole 20, the moving ring sealing surface 26, etc., and the pump volute casing 2 is provided with the pump liquid inlet flange surface 9, the oil supply hole 20, and the pump liquid inlet flange. There is a fixed ring 16 in the surface 9. The fixed ring corrugated groove surface 10 and the moving ring sealing surface 26 on the fixed ring 16 are provided with grease lubrication by the oil supply hole 20. There are moving ring impeller connecting surface 17 and springs on the moving ring 15 The spring 12 in the hole 13 pressurizes and seals the sealing surface 26 of the moving ring and the corrugated groove surface 10 of the fixed ring, thereby preventing the rotation leakage between the corrugated groove surface 10 of the fixed ring and the sealing surface 26 of the moving ring, which completely solves the problem of current use. The industry technical problem of wear and leakage of impeller and sealing ring.

Description

A centrifugal pump grease lubricated mechanical seal port ring

technical field

The invention relates to the technical field of fluid machinery, in particular to a grease lubricated mechanical seal port ring of a centrifugal pump.

Background technique

The reason for the low overall efficiency of the existing centrifugal pump is that the cavity gap between the sealing ring of the centrifugal pump and the closed impeller front cover and the pump volute casing is large, resulting in high pressure fluid at the outlet of the impeller and low pressure at the inlet of the impeller. The pressure difference between the fluids increases, which in turn increases the amount of fluid leakage, affecting the overall efficiency of its pump.

In order to solve the above-mentioned defects, patent CN2628764 discloses a centrifugal pump. A ring-shaped pipe body is arranged between the pump casing with a water inlet and the impeller. The water outlet is connected in an adjustable way, and the wear surface is changed to the end face. On the other hand, the outer edge of the pipe body is connected with the water inlet in an axially adjustable way. When the user finds that the pump head is reduced due to the increase of leakage, adjust the sealing ring relative to the water inlet. The axial position of the impeller inlet ensures the original design head index of the water pump, which better alleviates the above technical defects, but it is more troublesome to manually adjust.

Patent CN2541637 discloses a self-compensating constant gap sealing structure of a centrifugal pump mouth ring, which can make the impeller and the sealing mouth ring cooperate softly and elastically with each other, and the gap between the impeller and the sealing mouth ring increases with the degree of wear of the components. It can self-compensate for wear under the action of pressure, so as to maintain the original constant gap and achieve the sealing effect. However, the sealing structure has direct friction between the rotating impeller and the rubber sealing ring, which increases the mechanical friction resistance and consumes energy.

Patent CN205423310U discloses a new type of impeller of a high-efficiency centrifugal pump, which can reduce the above-mentioned defects of wear and leakage of the sealing ring. The leakage between the two parts is greatly reduced, thereby improving the overall conveying efficiency of the pump; however, because the new impeller of the high-efficiency centrifugal pump only reduces the leakage by reducing the gap between the front cavity and the mouth ring, it fails to fundamentally To prevent the gap leakage between the front cavity and the mouth ring, there is still a defect of partial leakage.

SUMMARY OF THE INVENTION

In order to change the above technical defects, the present invention discloses a centrifugal pump grease lubricated mechanical seal ring, which consists of a pump liquid outlet 1, a pump volute casing 2, an impeller liquid outlet 3, an impeller front cover 4, and an impeller rear cover 5. , shaft head connecting thread 6, pump shaft 7, pump cover 8, pump inlet flange surface 9, fixed ring corrugated groove surface 10, fixed ring seal 11, spring 12, spring hole 13, fixed impeller nut 14 , moving ring 15, fixed ring 16, moving ring impeller connecting surface 17, moving ring impeller positioning bolt 18, moving ring impeller connecting step 19, oil supply hole 20, pump inlet flange outer connection hole 21, oil supply cup 22 , the pump liquid outlet flange outer connecting hole 23, the pump liquid outlet flange surface 24, the impeller body 25, the moving ring sealing surface 26; The pump inlet flange surface 9, the oil supply hole 20, the pump inlet flange outer connection hole 21, the pump outlet flange outer connection hole 23, the pump outlet flange surface 24, the pump vortex shell 2. The upper end is also connected and fixed with a pump cover body 8, and the center of the pump cover body 8 is connected with the pump shaft 7.

The inner end of the flange surface 9 of the liquid inlet of the pump is provided with a fixed ring 16 and a fixed ring sealing ring 11. The fixed ring corrugated groove surface 10 and the movable ring sealing surface 26 on the fixed ring 16 are formed by the oil supply hole 20. Provide grease lubrication to form a lubricating grease film on the fixed ring corrugated groove surface 10 and the moving ring sealing surface 26. The function of the lubricating grease film is one: to change the dry friction surface of the sealing ring body into a grease lubricated friction surface, Therefore, the service life of the sealing ring is extended several times; the second function is to protect the sealing ring body from leakage, so that zero leakage between the two rotating sealing bodies of the fixed ring corrugated groove surface 10 and the movable ring sealing surface 26 is realized.

The central part of the impeller body 25 is installed on the upper end of the shaft head connecting thread 6 of the pump shaft 7, and there is a fixed impeller nut 14 to fasten it. The cover plate 5, the moving ring impeller connecting surface 17, the moving ring impeller connecting step 19, the moving ring impeller connecting surface 17 and the moving ring 15 are fixed and positioned by the moving ring impeller positioning bolt 18, and the two end faces are respectively provided with spring holes 13, A spring 12 is placed in the spring hole 13. The spring 12 performs pressure sealing on the movable ring sealing surface 26 of the movable ring 15 and the fixed ring corrugated groove surface 10. Under the action of pressure, the sealing surface is always in a leak-proof protection state, which completely solves the The industrial technical problem of wear and leakage of the current impeller and sealing ring.

Through the above-mentioned integrated structure design, the invention solves the trouble of manual adjustment by adjusting the axial position of the sealing ring relative to the inlet of the impeller when the head of the patent CN2628764 decreases due to the increase of the leakage of the water pump to ensure the original design head of the water pump; It also solves the technical defect of the patent CN2541637 that the mechanical frictional resistance consumes a lot of energy, and also completely solves the technical defect that the patent CN205423310U can only reduce the amount of leakage, but cannot fundamentally eliminate the leakage.

Description of drawings

1 is a schematic diagram of the overall structure of a centrifugal pump grease lubricated mechanical seal port ring of the present invention.

Marked as: 1- pump liquid outlet, 2- pump volute shell, 3- impeller liquid outlet, 4- impeller front cover, 5- impeller rear cover, 6- shaft head connecting thread, 7- pump Shaft, 8- pump cover, 9- pump inlet flange surface, 10- fixed ring corrugated groove surface, 11- fixed ring sealing ring, 12- spring, 13- spring hole, 14- fixed impeller nut, 15 -Moving ring, 16-Fixing ring, 17-Moving ring impeller connecting surface, 18-Moving ring impeller positioning bolt, 19-Moving ring impeller connecting step, 20-Oil supply hole, 21-Pump inlet flange outer connecting hole , 22- oil supply cup, 23- pump outlet flange outer connection hole, 24- pump outlet flange surface, 25- impeller body, 26- dynamic ring sealing surface.

Detailed ways

Specific embodiment: The present invention discloses a centrifugal pump grease lubricated mechanical seal ring, which consists of a pump liquid outlet 1, a pump volute casing 2, an impeller liquid outlet 3, an impeller front cover 4, an impeller rear cover 5, a shaft Head connecting thread 6, pump shaft 7, pump cover 8, pump inlet flange surface 9, fixed ring corrugated groove surface 10, fixed ring seal 11, spring 12, spring hole 13, fixed impeller nut 14, movable Ring 15, fixed ring 16, moving ring impeller connecting surface 17, moving ring impeller positioning bolt 18, moving ring impeller connecting step 19, oil supply hole 20, pump inlet flange outer connection hole 21, oil supply cup 22, pump The outer connection hole 23 of the liquid outlet flange, the flange surface 24 of the pump liquid outlet, the impeller body 25, and the sealing surface 26 of the moving ring are composed of the pump vortex casing 2. Liquid port flange surface 9, oil supply hole 20, pump liquid inlet flange outer connection hole 21, pump liquid port flange outer connection hole 23, pump liquid port flange surface 24, the upper end of the pump vortex shell 2 A pump cover body 8 is also connected and fixed, and the center of the pump cover body 8 is connected with the pump shaft 7 .

The inner end of the flange surface 9 of the liquid inlet of the pump is provided with a fixed ring 16 and a fixed ring sealing ring 11. The fixed ring corrugated groove surface 10 and the movable ring sealing surface 26 on the fixed ring 16 are formed by the oil supply hole 20. Provide grease lubrication to form a lubricating grease film on the fixed ring corrugated groove surface 10 and the moving ring sealing surface 26. The function of the lubricating grease film is one: to change the dry friction surface of the sealing ring body into a grease lubricated friction surface, Therefore, the service life of the sealing ring is extended several times; the second function is to protect the sealing ring body from leakage, so that zero leakage between the two rotating sealing bodies of the fixed ring corrugated groove surface 10 and the movable ring sealing surface 26 is realized.

The central part of the impeller body 25 is installed on the upper end of the shaft head connecting thread 6 of the pump shaft 7, and there is a fixed impeller nut 14 to fasten it. The cover plate 5, the moving ring impeller connecting surface 17, the moving ring impeller connecting step 19, the moving ring impeller connecting surface 17 and the moving ring 15 are fixed and positioned by the moving ring impeller positioning bolt 18, and the two end faces are respectively provided with spring holes 13, A spring 12 is placed in the spring hole 13. The spring 12 performs pressure sealing on the movable ring sealing surface 26 of the movable ring 15 and the fixed ring corrugated groove surface 10. Under the action of pressure, the sealing surface is always in a leak-proof protection state, which completely solves the The industrial technical problem of wear and leakage of the current impeller and sealing ring.

Through the above-mentioned integrated structure design, the invention solves the trouble of manual adjustment by adjusting the axial position of the sealing ring relative to the inlet of the impeller when the head of the patent CN2628764 decreases due to the increase of the leakage of the water pump to ensure the original design head of the water pump; It solves the technical defect of the patent CN2541637 that the mechanical frictional resistance consumes a lot of energy, and also completely solves the technical defect that the patent CN205423310U can only reduce the amount of leakage, but cannot fundamentally eliminate the leakage.

The beneficial effects of the present invention are: through the above-mentioned integrated structure design, the technical problem of the pump industry, which is the low efficiency caused by the leakage of the orifice ring, is completely solved, and the invention has the advantages of high efficiency, low energy consumption, convenient maintenance and use. Features such as long life.

Claims (1)

1. A centrifugal pump grease lubricated mechanical seal port ring consists of a pump liquid outlet (1), a pump volute casing (2), an impeller liquid outlet (3), a front impeller cover (4), and a rear impeller cover ( 5), shaft head connecting thread (6), pump shaft (7), pump cover body (8), pump inlet flange surface (9), fixing ring corrugated groove surface (10), fixing ring sealing ring (11) ), spring (12), spring hole (13), fixed impeller nut (14), moving ring (15), fixed ring (16), moving ring impeller connecting surface (17), moving ring impeller positioning bolt (18) , moving ring impeller connection step (19), oil supply hole (20), pump inlet flange outer connection hole (21), oil supply cup (22), pump outlet flange outer connection hole (23), The pump liquid outlet flange surface (24), the impeller body (25), and the moving ring sealing surface (26) are composed, and is characterized in that: the pump volute casing (2) is provided with a pump liquid outlet (1) , pump inlet flange surface (9), oil supply hole (20), pump inlet flange outer connection hole (21), pump outlet flange outer connection hole (23), pump outlet method The blue surface (24), the upper end of the pump volute casing (2) is also connected and fixed with a pump cover body (8), and the center of the pump cover body (8) is connected with the pump shaft (7); The inner end of the blue surface (9) is provided with a fixed ring (16) and a fixed ring sealing ring (11). The hole (20) provides grease lubrication for it, so that a layer of lubricating grease film is formed on the corrugated groove surface of the fixed ring (10) and the sealing surface of the moving ring (26). The dry friction surface becomes a grease-lubricated friction surface, which prolongs the service life of the sealing ring several times. The second function is to protect the sealing ring body from leakage, so that the corrugated groove surface (10) of the fixed ring and the sealing surface of the moving ring are connected. (26) Zero leakage is achieved between the two rotating sealing bodies; the central part of the impeller body (25) is installed on the upper end of the shaft head connecting thread (6) of the pump shaft (7), and there is a fixed impeller nut (14) to fix it The upper end is provided with the impeller liquid outlet (3), the impeller front cover plate (4), the impeller rear cover plate (5), the moving ring impeller connecting surface (17), and the moving ring impeller connecting step (19). The connecting surface (17) of the moving ring impeller and the moving ring (15) are fixed and positioned by the moving ring impeller positioning bolts (18), and spring holes (13) are respectively provided on the double end surfaces thereof, and springs (12) are placed in the spring holes (13). ), the spring (12) performs pressure sealing on the sealing surface of the moving ring (26) and the corrugated groove surface of the fixed ring (10). The industrial technical problem of wear and leakage of the mouth ring.

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