CN111794977B - Self-cleaning structure for mechanical seal of submersible sewage pump - Google Patents

Self-cleaning structure for mechanical seal of submersible sewage pump Download PDF

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Publication number
CN111794977B
CN111794977B CN202010560146.7A CN202010560146A CN111794977B CN 111794977 B CN111794977 B CN 111794977B CN 202010560146 A CN202010560146 A CN 202010560146A CN 111794977 B CN111794977 B CN 111794977B
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China
Prior art keywords
mechanical seal
ring
seal
impeller
self
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CN202010560146.7A
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CN111794977A (en
Inventor
叶代宏
蒋新杰
王强
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Hangzhou Xizi Pumps Co ltd
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Hangzhou Xizi Pumps Co ltd
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00Pumping installations or systems
    • F04D13/02Units comprising pumps and their driving means
    • F04D13/06Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/02Selection of particular materials
    • F04D29/026Selection of particular materials especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/08Sealings
    • F04D29/10Shaft sealings
    • F04D29/12Shaft sealings using sealing-rings
    • F04D29/126Shaft sealings using sealing-rings especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/70Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps

Abstract

The invention relates to a sewage pump, in particular to a mechanical seal self-cleaning structure of a submersible sewage pump. The utility model provides a submersible sewage pump machine seals automatically cleaning structure, which comprises a pump body and a motor, be connected with the impeller on the main shaft of motor, it is provided with the oil chamber lid to correspond main shaft and impeller on the pump body, form sealed chamber between oil chamber lid and the impeller, it is provided with the mechanical seal quiet ring to correspond oil chamber lid department on the main shaft, one side that is close to the impeller on the main shaft is provided with the mechanical seal rotating ring, it is provided with double spiral groove to correspond mechanical seal quiet ring and mechanical seal rotating ring on the lateral wall in sealed chamber, be provided with multi-functional sealing washer between mechanical seal quiet ring and the oil chamber lid, one side that is located sealed chamber of multi-functional sealing washer is. The mechanical seal of the invention can not gather a large amount of particles, and can achieve the self-cleaning effect of the mechanical seal, thereby prolonging the service life of the mechanical seal and avoiding the water leakage of a pump.

Description

Self-cleaning structure for mechanical seal of submersible sewage pump
Technical Field
The invention relates to a sewage pump, in particular to a mechanical seal self-cleaning structure of a submersible sewage pump.
Background
The submersible sewage pump is widely applied to the sewage discharge of electric power and chemical engineering port ship loading and unloading systems and agricultural irrigation. The media transport is typically performed by a drive device driving the dredge pump through a coupling and a long shaft. The safety and the operation of the submersible sewage pump are directly related to whether the whole application system can normally operate, so that the submersible sewage pump has higher requirements on the reliability, the usability, the installation, the operation and the maintenance of the submersible sewage pump equipment.
As shown in fig. 4, the mechanical seal of the oil chamber cover 4 of the existing submersible sewage pump is usually designed by a planar structure 17, when the pump operates in a severe sewage environment, a large amount of impurities and small fine sand particles are accumulated at the mechanical seal for a long time, which can cause severe abrasion of the contact surface of the mechanical seal dynamic and static rings, shorten the service life of the mechanical seal and cause water leakage of the pump.
For example, Chinese patent publication numbers are: CN205013323U, a small-size submersible sewage pump of announcing in 2016 month 2 and 3, including bearing, axle, stator, motor casing, pencil assembly, mechanical seal gland, the pump body, impeller, motor cover and handle, the one end of the pump body is connected to the bottom of motor casing, sets up the impeller in the pump body, the one end of impeller connecting axle, the motor cover is connected through the bearing to the other end of axle, and the epaxial installation mechanical seal of impeller one side, mechanical seal gland compress tightly mechanical seal in the junction of axle and pump body. The motor casing, the motor cover and the lifting handle are integrally cast, so that the production and processing cost is reduced, the wire inlet holes are formed in the side face of the bottom of the motor casing and are used for allowing a wire harness assembly to enter, the number of sealing surfaces is reduced from original 4 to 1, the potential water leakage risk is greatly reduced, and the overall safety performance is improved; meanwhile, the whole structure of the electric pump is more compact, the center of gravity is reduced, and the operation is more stable and reliable, but the mechanical seal part of the oil chamber cover usually adopts a plane type structural design, when the pump operates in a severe sewage environment, a large amount of impurities and small fine sand particles are gathered at the mechanical seal part for a long time, so that the contact surface of a dynamic ring and a static ring of the mechanical seal is seriously abraded, the service life of the mechanical seal is shortened, and the water leakage of the pump is caused.
Disclosure of Invention
The invention mainly aims at the problem that when a pump runs in a severe sewage environment, a large amount of impurities and small fine sand particles are accumulated at a mechanical seal part for a long time, so that the contact surface of a dynamic ring and a static ring of the mechanical seal is seriously abraded, the service life of the mechanical seal is shortened, and water leakage of the pump is caused.
The purpose of the invention is mainly realized by the following scheme: a submersible sewage pump mechanical seal self-cleaning structure comprises a pump body and a motor, wherein the main shaft of the motor is connected with an impeller, the pump body is provided with an oil chamber cover corresponding to the main shaft and the impeller, a seal cavity is formed between the oil chamber cover and the impeller, a mechanical seal static ring is arranged on the main shaft corresponding to the oil chamber cover, a mechanical seal dynamic ring is arranged on one side of the main shaft close to the impeller, a double-spiral groove is arranged on the side wall of the seal cavity corresponding to the mechanical seal static ring and the mechanical seal dynamic ring, a multifunctional seal ring is arranged between the mechanical seal static ring and the oil chamber cover, one side of the multifunctional seal ring, which is positioned in the seal cavity, is provided with an impurity removing mechanism, the impurity removing mechanism comprises a bulge arranged on one side of the multifunctional seal ring, which is close to the mechanical seal dynamic ring, a gas storage cavity is arranged in the multifunctional seal ring and the bulge, a gas guide channel communicated with the gas storage cavity, the air guide channel is provided with a sliding cavity, the sliding cavity is connected with a sliding block in a sliding mode, the multifunctional sealing ring is provided with a flow guide channel communicated with the sliding cavity and the sealing cavity, one end of the flow guide channel is connected to one side, far away from the air guide channel, of the sliding cavity, and the mechanical sealing ring is provided with a protruding block corresponding to the protruding block. The main shaft of the motor is connected with an impeller, an oil chamber cover is arranged on the pump body corresponding to the main shaft and the impeller, a sealing cavity is formed between the oil chamber cover and the impeller, a machine seal static ring is arranged on the main shaft corresponding to the oil chamber cover, a machine seal movable ring is arranged on one side of the main shaft close to the impeller, and double spiral grooves are arranged on the side wall of the sealing cavity corresponding to the machine seal static ring and the machine seal movable ring, when the pump normally operates, impurities and small fine sand particles are thrown towards the impeller by centrifugal force in the rotation process of the oil chamber cover, so that a large amount of particles cannot be gathered at the machine seal position, the self-cleaning effect of the machine seal can be achieved, the service life of the machine seal is prolonged, and the existing water leakage condition of the pump is prevented, a multifunctional sealing ring is arranged between the machine seal static ring and the oil chamber cover, one side of the multifunctional sealing ring, which is positioned in the sealing cavity, the multifunctional sealing ring and the bulge are internally provided with gas storage cavities, the multifunctional sealing ring is internally provided with a gas guide channel communicated with the gas storage cavities, the gas guide channel is provided with a sliding cavity, the sliding cavity is internally and slidably connected with a sliding block, the multifunctional sealing ring is provided with a flow guide channel communicated with the sliding cavity and the sealing cavity, one end of the flow guide channel is connected to one side of the sliding cavity, which is far away from the gas guide channel, the mechanical seal ring is provided with a lug corresponding to the bulge, when the pump runs, a main shaft on the motor rotates and drives the mechanical seal ring to rotate simultaneously, when the mechanical seal ring rotates, the lug on the mechanical seal ring can be abutted against the bulge according to certain frequency, when the lug is abutted against the bulge, the bulge can be pressed towards the inside of the multifunctional sealing ring, so that gas in the gas storage cavities after being extruded flows into the gas guide channel, then gas in the gas guide channel can flow, when the sliding block moves, water flow entering the sliding cavity is discharged along the flow guide channel, and the water flow with certain impact force enters the sealing cavity, so that impurity particles gathered at the mechanical seal position can be dispersed, the mechanical seal self-cleaning effect can be further achieved, and the self-cleaning effect is very stable.
Preferably, the cross section of the multifunctional sealing ring is Z-shaped. The cross-section of multi-functional sealing washer is the Z type for multi-functional sealing washer can laminate steadily between quick-witted stationary seal ring and the grease chamber lid, and the leakproofness is good.
Preferably, the number of the impurity removing mechanisms arranged on the multifunctional sealing ring is multiple. The number of the impurity removing mechanisms arranged on the multifunctional sealing ring is multiple, the number of the convex blocks corresponding to the multifunctional sealing ring can also be multiple, the self-cleaning effect of certain frequency is ensured through the rotation of the motor spindle, and the stability is good.
Preferably, the multifunctional sealing ring is made of rubber materials. The multifunctional sealing ring is made of rubber materials, is easy to process, has good corrosion resistance and long service life.
Preferably, the number of the impurity removing mechanisms arranged on the multifunctional sealing ring is 4. The quantity of the edulcoration mechanism that sets up on the multi-functional sealing washer is 4, and 4 edulcoration mechanisms set up on the multi-functional sealing washer around the even interval of main shaft, have guaranteed the automatically cleaning effect.
Preferably, the cross-sectional diameter of the seal cavity gradually increases towards the impeller. The diameter of the cross section of the sealing cavity is gradually increased towards the direction close to the impeller, so that the particle impurities are conveniently discharged along the direction of the impeller after being acted by centrifugal force.
Preferably, the oil chamber cover is fixed to the pump body by a bolt. The oil chamber cover is fixed on the pump body through a bolt, and the connection is very stable.
Therefore, the self-cleaning structure of the mechanical seal of the submersible sewage pump has the following advantages: the mechanical seal provided by the invention has the advantages that a large amount of particles are not accumulated at the mechanical seal position, the self-cleaning effect of the mechanical seal can be achieved, the service life of the mechanical seal is prolonged, the condition of water leakage of a pump is avoided, and the self-cleaning effect is very stable.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an enlarged view at a in fig. 1.
Fig. 3 is a cross-sectional view of an oil chamber cover of the present invention.
Fig. 4 is a cross-sectional view of a prior art oil chamber cover.
Illustration of the drawings: 1-pump body, 2-motor, 3-impeller, 4-oil chamber cover, 5-mechanical seal static ring, 6-mechanical seal moving ring, 7-double spiral groove, 8-multifunctional seal ring, 9-lug, 10-bulge, 11-gas storage cavity, 12-gas guide channel, 13-sliding cavity, 14-sliding block, 15-flow guide channel, 16-seal cavity, 17-plane type structure and 18-main shaft.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example 1:
as shown in fig. 1 and 2, a mechanical seal self-cleaning structure of a submersible sewage pump comprises a pump body 1 and a motor 2, wherein a main shaft 18 of the motor 2 is connected with an impeller 3, the pump body 1 is provided with an oil chamber cover 4 corresponding to the main shaft 18 and the impeller 3, a sealing cavity 16 is formed between the oil chamber cover 4 and the impeller 3, a mechanical seal static ring 5 is arranged on the main shaft 18 corresponding to the oil chamber cover 4, a mechanical seal moving ring 6 is arranged on one side of the main shaft 18 close to the impeller 3, and a double-spiral groove 7 is arranged on the side wall of the sealing cavity 16 corresponding to the mechanical seal static ring 5 and the mechanical seal moving ring 6, when the pump normally operates, impurities and small fine sand particles are thrown towards the impeller 3 under the action of centrifugal force in the rotating process on the double-spiral groove 7 at the oil chamber cover 4, so that a large amount of particles cannot be gathered at the mechanical seal position, thereby achieving the mechanical seal self-cleaning effect, prolonging the service life of the mechanical seal, preventing the current water, an impurity removing mechanism is arranged on one side, which is positioned in a sealing cavity 16, of the multifunctional sealing ring 8, the impurity removing mechanism comprises a protrusion 10 arranged on one side, which is close to the mechanical seal moving ring 6, of the multifunctional sealing ring 8, a gas storage cavity 11 is arranged in the multifunctional sealing ring 8 and the protrusion 10, a gas guide channel 12 communicated with the gas storage cavity 11 is arranged in the multifunctional sealing ring 8, a sliding cavity 13 is arranged on the gas guide channel 12, a sliding block 14 is connected in the sliding cavity 13 in a sliding way, a flow guide channel 15 communicated with the sliding cavity 13 and the sealing cavity 16 is arranged on the multifunctional sealing ring 8, one end of the flow guide channel 15 is connected to one side, which is far away from the gas guide channel 12, of the mechanical seal moving ring 6, a lug 9 corresponding to the protrusion 10 is arranged on the mechanical seal moving ring 6, when the pump is operated, a main shaft on the motor 2 rotates and drives the mechanical seal moving ring 6 to rotate, when the lug 9 is abutted to the lug 10, the lug 10 is pressed towards the inside of the multifunctional sealing ring 8, so that gas in the gas storage cavity 11 flows into the gas guide channel 12 after the gas storage cavity 11 is extruded, then the gas in the gas guide channel 12 flows into the sliding cavity 13, the gas entering the sliding cavity 13 pushes the slider 14 to move, the slider 14 discharges water flow entering the sliding cavity 13 along the flow guide channel 15 when moving, and the water flow with certain impact force enters the sealing cavity 16 after forming the water flow, so that impurity particles gathered at the mechanical seal position can be dispersed, the mechanical seal self-cleaning effect can be further achieved, and the self-cleaning effect is very stable.
The cross-section of multi-functional sealing washer 8 is the Z type for multi-functional sealing washer 8 can laminate steadily between quick-witted seal stationary ring 5 and grease chamber lid 4, and the leakproofness is good.
The multifunctional sealing ring 8 is provided with a plurality of impurity removing mechanisms, and the number of the corresponding lugs 9 can also be a plurality, so that the self-cleaning effect with certain frequency is ensured through the rotation of the main shaft of the motor 2, and the stability is good; in this embodiment, the number of the edulcoration mechanism that sets up on the multi-functional sealing washer 8 is 4, and 4 edulcoration mechanisms set up on multi-functional sealing washer 8 around the even interval of main shaft, have guaranteed the automatically cleaning effect.
The multifunctional sealing ring 8 is made of rubber materials, is easy to process, has good corrosion resistance and long service life.
As shown in fig. 3, the cross-sectional diameter of the seal chamber 16 is gradually increased toward the impeller 3, thereby facilitating the discharge of the particulate impurities along the impeller 3 by the centrifugal force.
The oil chamber cover 4 is fixed on the pump body 1 through bolts and is very firmly connected.
It should be understood that this example is only for illustrating the present invention and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

Claims (7)

1. A submersible sewage pump mechanical seal self-cleaning structure comprises a pump body and a motor, wherein the main shaft of the motor is connected with an impeller, the pump body is provided with an oil chamber cover corresponding to the main shaft and the impeller, a seal cavity is formed between the oil chamber cover and the impeller, a mechanical seal static ring is arranged on the main shaft corresponding to the oil chamber cover, a mechanical seal dynamic ring is arranged on one side of the main shaft close to the impeller, the submersible sewage pump mechanical seal self-cleaning structure is characterized in that the side wall of the seal cavity is provided with a double-spiral groove corresponding to the mechanical seal static ring and the mechanical seal dynamic ring, a multifunctional seal ring is arranged between the mechanical seal static ring and the oil chamber cover, one side of the multifunctional seal ring, which is positioned in the seal cavity, is provided with an impurity removing mechanism, the impurity removing mechanism comprises a bulge arranged on one side of the multifunctional seal ring, which is close to the mechanical seal dynamic ring, a gas storage cavity is arranged in the multifunctional seal ring, and a gas, the air guide channel is provided with a sliding cavity, the sliding cavity is connected with a sliding block in a sliding mode, the multifunctional sealing ring is provided with a flow guide channel communicated with the sliding cavity and the sealing cavity, one end of the flow guide channel is connected to one side, far away from the air guide channel, of the sliding cavity, and the mechanical sealing ring is provided with a protruding block corresponding to the protruding block.
2. The submersible sewage pump mechanical seal self-cleaning structure as recited in claim 1, wherein the cross section of the multifunctional seal ring is Z-shaped.
3. The submersible sewage pump mechanical seal self-cleaning structure as claimed in claim 1, wherein the number of the impurity removing mechanisms arranged on the multifunctional sealing ring is multiple.
4. A submersible sewage pump mechanical seal self-cleaning structure as claimed in claim 1, 2 or 3 wherein the multifunctional seal ring is made of rubber material.
5. The submersible sewage pump mechanical seal self-cleaning structure as claimed in claim 4, wherein the number of the impurity removing mechanisms arranged on the multifunctional sealing ring is 4.
6. A submersible sewage pump seal self-cleaning arrangement as claimed in claim 1, 2 or 3, wherein the cross-sectional diameter of the seal chamber increases progressively towards the impeller.
7. A submersible sewage pump mechanical seal self-cleaning structure as claimed in claim 1, 2 or 3, wherein the oil chamber cover is fixed on the pump body by bolts.
CN202010560146.7A 2020-06-18 2020-06-18 Self-cleaning structure for mechanical seal of submersible sewage pump Active CN111794977B (en)

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CN202010560146.7A CN111794977B (en) 2020-06-18 2020-06-18 Self-cleaning structure for mechanical seal of submersible sewage pump

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Application Number Priority Date Filing Date Title
CN202010560146.7A CN111794977B (en) 2020-06-18 2020-06-18 Self-cleaning structure for mechanical seal of submersible sewage pump

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CN111794977B true CN111794977B (en) 2021-06-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4460181A (en) * 1980-06-26 1984-07-17 Toyo Denki Kogyosho Co., Ltd. Method and mechanism for controlling the pressure at shaft-sealing part of an apparatus
JP2005282469A (en) * 2004-03-30 2005-10-13 Kubota Corp Cooling structure for pump motor
CN103147978A (en) * 2011-12-06 2013-06-12 株式会社电装 Rotating machine
CN203067339U (en) * 2013-02-06 2013-07-17 山东寿光鲁清石化有限公司 Mechanical sealing device for oil slurry pump
CN205190248U (en) * 2015-12-14 2016-04-27 温州盛锋流体设备有限公司 Sterile -type centrifugal pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4460181A (en) * 1980-06-26 1984-07-17 Toyo Denki Kogyosho Co., Ltd. Method and mechanism for controlling the pressure at shaft-sealing part of an apparatus
JP2005282469A (en) * 2004-03-30 2005-10-13 Kubota Corp Cooling structure for pump motor
CN103147978A (en) * 2011-12-06 2013-06-12 株式会社电装 Rotating machine
CN203067339U (en) * 2013-02-06 2013-07-17 山东寿光鲁清石化有限公司 Mechanical sealing device for oil slurry pump
CN205190248U (en) * 2015-12-14 2016-04-27 温州盛锋流体设备有限公司 Sterile -type centrifugal pump

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