CN210240096U

CN210240096U - Centrifugal pump cavity seal structure

Info

Publication number: CN210240096U
Application number: CN201920920904.4U
Authority: CN
Inventors: Haiqing Mei; 梅海清
Original assignee: Amos Fluid Technology Co ltd
Current assignee: Amos Fluid Technology Co ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-04-03
Anticipated expiration: 2029-06-19

Abstract

The utility model discloses a centrifugal pump chamber seal structure, including the pump body, pump body perpendicular to axial one side is equipped with its intercommunication in the export pipeline of export, parallel axial one end is equipped with import it and is used for connecting the import pipeline, pump body rear end is furnished with the pump cover, the mid-mounting of the pump body has the main shaft, install the impeller on the main shaft, be equipped with the sealing unit between pump cover and the main shaft, the sealing unit is including the skeleton bearing seal, the skeleton oil blanket of grease chamber and sealed grease chamber, it is sealed through the sealing washer between impeller and the pump body export, the main shaft input is located hollow suspension, the suspension is hugged closely and is installed in the cooperation end outside of axle cap and pump body, main shaft in the suspension passes through the bearing rotation and installs in the suspension, and through bearing gland seal installation, be equipped with the skeleton bearing seal. The utility model discloses it is sealed effectual, to the vibration of pump or the eccentric of main shaft have certain adaptability, require lowly to service environment.

Description

Centrifugal pump cavity seal structure

The technical field is as follows:

the utility model relates to a centrifugal pump field mainly relates to a centrifugal pump chamber seal structure.

Background art:

centrifugal pumps are a type of machine that delivers liquids for irrigation, domestic water systems, sewage treatment, and many other applications. The liquid is forced from the suction sump through the pump body and out the outlet pipe by an impeller located in the pump body. The impeller is supported by a shaft extending into the pump chamber and rotates with the shaft, which is connected to the prime mover drive and supported by bearings in the suspension. The chamber in the pump body is sealed to only allow liquid to enter from the water inlet and exit from the water outlet. In the past, a packing or mechanical seal unit is arranged between the pump cover and the shaft to seal the pump cavity, so that high-pressure medium in the pump cavity cannot leak, and outside air cannot enter the pump cavity.

The packing seal mainly adopts an oil-immersed graphite rope, the packing is compressed by a packing gland to deform the packing, and the packing is fully contacted with the excircle of the shaft and the surface of a packing hole of the pump cover to prevent liquid in the pump cavity from flowing out and air from being sucked. The tightness of the packing seal is controlled by adjusting the tightness of the packing gland. Reasonable tightness is that liquid leaks out of the pump chamber at a rate of 15-20 drops per minute. The sealing of the packing is easy to pollute the medium in the pump cavity, and the small leakage of the medium can also cause environmental pollution. The excessive packing seal is manually controlled according to the endurance, the operation is troublesome, and the friction between the packing and the high-speed rotating main shaft can wear the main shaft and consume power.

The mechanical seal is a sealing device which depends on the mutual fit and relative sliding rotation of the end surfaces of the static ring and the movable ring and is formed by the matching of the auxiliary seal of the movable ring and the static ring and the action of the elastic force of a compensation mechanism. The mechanical seal has good stability, long service life and low friction power consumption. However, the mechanical seal has the advantages of multiple mechanical seal accessories, complex structure, high manufacturing and processing requirements, high cost, high installation precision and high requirements on working environment. The use of mechanical seals under normal operating conditions is not economical and practical.

The utility model has the following contents:

the utility model discloses the purpose is exactly in order to compensate prior art's defect, provides a centrifugal pump chamber seal structure to solve under the prior art condition problem that the centrifugal pump is with seal unit leakproofness unstable, power consumption is big, use cost is high for the centrifugal pump.

The utility model discloses a realize through following technical scheme:

the utility model provides a centrifugal pump chamber seal structure, including the pump body, one side of pump body perpendicular to axial is equipped with its intercommunication in outlet pipe of export, and parallel axial one end is equipped with its import and is used for connecting inlet pipe, pump body rear end is furnished with the pump cover, the mid-mounting of the pump body has the main shaft, install the impeller on the main shaft, the pump cover is passed to the main shaft input, its characterized in that: the utility model discloses a breather pump, including pump cover, impeller, pump cover, main shaft, bearing gland, breather cover, pump cover, bearing gland and main shaft, it is sealed through O type circle between the pump cover and the pump cover, be equipped with sealing unit between pump cover and the main shaft, sealing unit is including the skeleton oil blanket of skeleton bearing gland, grease chamber and grease chamber, it is sealed through the sealing washer between impeller and the pump body export, the main shaft input is located hollow suspension, the suspension is hugged closely and is installed in the cooperation end outside of axle cover and the pump body, main shaft in the suspension passes through the bearing and rotates to be installed in the suspension, and.

The shaft of the framework is sealed by two shafts.

The framework shaft seal comprises an elastic sealing rubber body, a channel matched with a main shaft is arranged in the middle of the elastic sealing rubber body, a convex shaft seal cutting edge is arranged in the channel, an annular cavity with one end opened is axially arranged in the elastic sealing rubber body in the circumferential direction of the channel, an annular metal framework is arranged in the elastic sealing rubber body outside the annular cavity, and a self-tightening spiral spring is clamped on the side wall of the elastic sealing rubber body inside the annular cavity.

The end part of the elastic sealing rubber body on the inner side of the opening end of the annular concave cavity is shorter than the end part of the elastic sealing rubber body on the inner side, and the elastic sealing rubber body on the inner side of the other end of the annular concave cavity is provided with a sealing lip.

The cross section of the annular metal framework is of a symmetrical L-shaped structure, the vertical section of the annular metal framework is located at the axial position of the outer side wall of the annular concave cavity, and the horizontal section of the annular metal framework is located at one end of the elastic sealing rubber body.

The oil chamber is internally provided with an oil permeable ring which is used for axially positioning the shaft seal and the framework oil seal, an oil filling port is arranged above the oil chamber, and a sewage draining port is arranged below the oil chamber.

In the above structure: the end of the pump cover is provided with a sealing unit, the sealing unit is used for driving bubbles and solid particles between the pump cavity and the rotating main shaft to enable the sealing unit to be in a clean environment, the pump cover is connected with the suspension backwards, and a breather is arranged above the suspension and used for communicating the cavity with the atmosphere after the temperature in the bearing cavity rises so as to balance the pressure. The suspension is internally provided with a bearing and a main shaft, the bearing is axially positioned and installed in a bearing hole of the suspension by a bearing gland, the main shaft is supported by the bearing and extends out from a driving end through the suspension for connecting a prime motor, a non-driving end of the main shaft penetrates through a pump cover to enter a pump body, an impeller is positioned in the center of a flow passage of the pump body, is installed on the main shaft and is driven by the main shaft to rotate, and the rotation of the impeller forces a medium to rotate in a pump cavity, and is discharged from an outlet of the pump.

The sealing unit at the front end of the pump cover is provided with two pressure-resistant inner-wrapped framework shaft seals at the end of a contact medium, and the shaft seals can bear 1.0Mpa pressure and can sufficiently bear the pressure of a back chamber of an impeller of a centrifugal pump. The metal framework in the shaft seal plays a role in strengthening the shaft seal, so that the oil seal keeps the shape and the tension, and the metal framework is not contacted with a medium to avoid corrosion. A layer of liquid film controlled by the shaft seal cutting edge exists between the shaft seal and the rotating shaft, the layer of liquid film has the characteristic of fluid lubrication, and the rigidity of the liquid film just enables the liquid film to form a meniscus with an air contact end under the action of the tension of the liquid surface, so that the medium in a pump cavity can be prevented from leaking, and the shaft seal can be lubricated. The shaft seal comprises a self-tightening spiral spring which can compensate the self-tightening force of the shaft seal wrapping the shaft at any time. One side of the first shaft seal contacting the medium is completely contacted with the medium, bears the pressure in the pump cavity and seals the pump cavity. The second shaft seal belongs to a spare seal and seals the pump cavity after the first seal leaks. The outside of the shaft seal is provided with an oil chamber and a framework oil seal for sealing the oil chamber. The second shaft seal is lubricated and radiated by lubricating oil in the oil chamber, an oil penetrating ring is arranged in the oil chamber to axially position the shaft seal and the outer side framework oil seal, the oil chamber is communicated with an oil filling cup for adding lubricating oil or lubricating grease to lubricate the oil seal, and a sewage discharging plug is arranged below the oil chamber and used for discharging waste oil and waste liquid.

The utility model has the advantages that:

1. the framework shaft seal has simple structure and low manufacturing cost;

2. the pump cavity is compact and easy to process;

3. the performance is stable, the sealing effect is good, certain adaptability is provided for the vibration of a pump or the eccentricity of a main shaft, and the requirement on the use environment is low;

4. the service life is long, the self-tightening spiral spring can compensate the self-tightening force of the shaft seal wrapping shaft at any time, a certain compensation effect is realized on the sealing performance, and the service life of the two shaft seals is longer;

5. the assembly and disassembly are convenient, and the assembly and disassembly can be completed without complex tools;

6. energy conservation and environmental protection, low friction power consumption and little pollution to media and external environment.

Description of the drawings:

fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a sectional view of the shaft seal of the present invention.

The specific implementation mode is as follows:

see the drawings.

The utility model provides a centrifugal pump chamber seal structure, including the pump body 18, the axial one side of pump body 18 perpendicular to is equipped with its intercommunication in outlet pipe 17 of export, and parallel axial one end is equipped with 19 its inlet that is used for connecting the inlet pipe, pump body 18 rear end is furnished with pump cover 13, the mid-mounting of pump body 18 has main shaft 1, install impeller 15 on the main shaft 1, main shaft 1 input passes pump cover 13, seal 14 through O type circle between pump body 18 and the pump cover 13, be equipped with sealing unit between pump cover 13 and the main shaft 1, sealing unit is including skeleton bearing seal 12, grease chamber and the skeleton oil blanket 10 of sealed grease chamber, it is sealed through sealing washer 16 between impeller 15 and the pump body 18 export, main shaft 1 input is located hollow suspension 5, suspension 5 hugs closely and installs in the outside of the mating end of shaft cover and pump body 18, main shaft 1 in the suspension 5 passes through bearing 4, 7 are rotatably arranged in the suspension 5 and are hermetically arranged through bearing glands 3 and 9,

framework shaft seals

2 and 10 are arranged between the bearing glands 3 and 9 and the main shaft 1, and a breather 6 is arranged on the suspension 5 between the two bearing glands 3 and 9.

The number of the framework shaft seals 12 is two.

The framework shaft seal 12 comprises an elastic sealing rubber body 25, a channel matched with the spindle 1 is arranged in the middle of the elastic sealing rubber body 25, a convex shaft seal cutting edge 26 is arranged in the channel, an annular cavity with one open end is axially arranged in the elastic sealing rubber body 25 in the circumferential direction of the channel, an annular metal framework 23 is arranged in the elastic sealing rubber body 25 outside the annular cavity, and a self-tightening spiral spring 24 is clamped on the side wall of the elastic sealing rubber body 25 inside the annular cavity.

The section of the annular metal framework 23 is of a symmetrical L-shaped structure, the vertical section of the annular metal framework is located at the axial position of the outer side wall of the annular concave cavity, and the horizontal section of the annular metal framework is located at one end of the elastic sealing rubber body.

The oil chamber is internally provided with an oil permeable ring 22, the oil permeable ring 22 is used for axially positioning the shaft seal and the framework oil seal, an oil filling port 11 is arranged above the oil chamber, and a sewage draining port 21 is arranged below the oil chamber.

Claims

1. The utility model provides a centrifugal pump chamber seal structure, including the pump body, one side of pump body perpendicular to axial is equipped with its intercommunication in outlet pipe of export, and parallel axial one end is equipped with its import and is used for connecting inlet pipe, pump body rear end is furnished with the pump cover, the mid-mounting of the pump body has the main shaft, install the impeller on the main shaft, the pump cover is passed to the main shaft input, its characterized in that: the utility model discloses a breather pump, including pump cover, impeller, pump cover, main shaft, bearing gland, breather cover, pump cover, bearing gland and main shaft, it is sealed through O type circle between the pump cover and the pump cover, be equipped with sealing unit between pump cover and the main shaft, sealing unit is including the skeleton oil blanket of skeleton bearing gland, grease chamber and grease chamber, it is sealed through the sealing washer between impeller and the pump body export, the main shaft input is located hollow suspension, the suspension is hugged closely and is installed in the cooperation end outside of axle cover and the pump body, main shaft in the suspension passes through the bearing and rotates to be installed in the suspension, and.

2. A centrifugal pump chamber sealing structure according to claim 1, wherein: the shaft of the framework is sealed by two shafts.

3. A centrifugal pump chamber sealing structure according to claim 1, wherein: the framework shaft seal comprises an elastic sealing rubber body, a channel matched with a main shaft is arranged in the middle of the elastic sealing rubber body, a convex shaft seal cutting edge is arranged in the channel, an annular cavity with one end opened is axially arranged in the elastic sealing rubber body in the circumferential direction of the channel, an annular metal framework is arranged in the elastic sealing rubber body outside the annular cavity, and a self-tightening spiral spring is clamped on the side wall of the elastic sealing rubber body inside the annular cavity.

4. A centrifugal pump chamber sealing structure according to claim 3, wherein: the end part of the elastic sealing rubber body on the inner side of the opening end of the annular concave cavity is shorter than the end part of the elastic sealing rubber body on the inner side, and the elastic sealing rubber body on the inner side of the other end of the annular concave cavity is provided with a sealing lip.

5. A centrifugal pump chamber sealing structure according to claim 3, wherein: the cross section of the annular metal framework is of a symmetrical L-shaped structure, the vertical section of the annular metal framework is located at the axial position of the outer side wall of the annular concave cavity, and the horizontal section of the annular metal framework is located at one end of the elastic sealing rubber body.

6. A centrifugal pump chamber sealing structure according to claim 1, wherein: the oil chamber is internally provided with an oil permeable ring which is used for axially positioning the shaft seal and the framework oil seal, an oil filling port is arranged above the oil chamber, and a sewage draining port is arranged below the oil chamber.