CN215672852U - High-lift two-stage slurry pump mechanical seal cavity structure and high-lift two-stage slurry pump - Google Patents
High-lift two-stage slurry pump mechanical seal cavity structure and high-lift two-stage slurry pump Download PDFInfo
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- CN215672852U CN215672852U CN202122310059.9U CN202122310059U CN215672852U CN 215672852 U CN215672852 U CN 215672852U CN 202122310059 U CN202122310059 U CN 202122310059U CN 215672852 U CN215672852 U CN 215672852U
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Abstract
The utility model provides a high-lift two-stage slurry pump mechanical seal cavity structure and a high-lift two-stage slurry pump, which belong to the technical field of slurry pumps and comprise a rotating shaft, two-stage feeding sections and two mechanical seals, wherein the two-stage feeding sections are respectively arranged at two ends of the rotating shaft, the two mechanical seals are correspondingly arranged between the feeding sections and the rotating shaft, the feeding sections are provided with feeding channels and through holes through which the rotating shaft penetrates, a mechanical seal cavity is formed between the rotating shaft and the inner walls of the through holes, and the feeding channels are communicated with the mechanical seal cavity without obstacles; the mechanical seal is sealed at one end of the mechanical seal cavity body, which is far away from the feeding channel; the mechanical seal cavity is provided with an open buffer cavity communicated with the feeding channel after being installed with a mechanical seal. The mechanical seal cavity of the two-stage feeding section is communicated with the feeding channel without obstacles, fluid always has fluidity and cannot be bonded to the mechanical seal, the risk of damage and failure of the mechanical seal is reduced, the maintenance cost and frequency are reduced, and the service life of equipment is prolonged.
Description
Technical Field
The utility model belongs to the technical field of slurry pumps, and particularly relates to a mechanical seal cavity structure of a high-lift two-stage slurry pump and a high-lift two-stage slurry pump with the same.
Background
The slurry pump delivers a mixture of solid particles containing dregs and water, divided by the number of impellers, and includes a single-stage slurry pump and a multi-stage slurry pump. The slurry pump transfers the mechanical energy of the high-speed rotation of the motor through the impeller of the pump and converts the mechanical energy into the pressure energy and the kinetic energy of the pumped fluid.
The slurry pump is widely applied to industries such as mines, electric power, metallurgy, coal, environmental protection and the like, and is used for conveying slurry containing abrasive solid particles. Such as ore pulp conveying in metallurgical ore dressing plant, hydraulic ash removal in thermal power plant, coal slurry and heavy medium conveying in coal washing plant, river dredging, etc. In the chemical industry, corrosive slurries containing crystals are also transported.
The reliable seal of the slurry pump can better convey slurry, and the mechanical seal of the existing two-stage slurry pump is specifically, referring to fig. 6, a mechanical seal cavity is arranged on a first-stage feeding section and a second-stage feeding section of the two-stage slurry pump, and a step retaining ring 101 is arranged on one side close to an impeller so as to prevent the slurry from directly contacting with the mechanical seal. The mechanical seal cavity body of this kind of mode, because the backstop of step retaining ring, constitute the dead angle between mechanical seal cavity body and the step retaining ring, and because need set up the gap between the pivot of step retaining ring and sediment stuff pump, so that the rotation of pivot, the thick liquids that have the granule can enter into the mechanical seal cavity body from the gap, in long-time operation process, thick liquids and granule can adhere to mechanical seal, cause mechanical seal scabbing inefficacy, the gap between step retaining ring and the pivot also can be filled to the granule, cause the pivot wearing and tearing, thereby influence the life of mechanical seal and sediment stuff pump, cause the fault incidence high, cost of maintenance is high, influence the normal operating of production.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a high-lift two-stage slurry pump mechanical seal cavity structure and a high-lift two-stage slurry pump, and aims to solve the problems of short service life, high maintenance frequency and high maintenance cost of a mechanical seal caused by failure of the mechanical seal at a first-stage feeding section and a second-stage feeding section.
In a first aspect, an embodiment of the present invention provides a high-lift two-stage slurry pump mechanical seal cavity structure, including a rotating shaft, two stages of feeding sections and two mechanical seals, where the two stages of feeding sections are respectively disposed at two ends of the rotating shaft, the two mechanical seals are correspondingly disposed between the feeding sections and the rotating shaft, the feeding sections are provided with feeding channels and through holes through which the rotating shaft passes, a mechanical seal cavity is formed between the rotating shaft and inner walls of the through holes, and the feeding channels are in barrier-free communication with the mechanical seal cavity; the mechanical seal is sealed at one end of the mechanical seal cavity far away from the feeding channel; the mechanical seal cavity is provided with an open buffer cavity communicated with the feeding channel after the mechanical seal cavity is installed for mechanical seal.
With reference to the first aspect, in one possible implementation manner, the through hole includes a mechanical seal section closely matched with the mechanical seal and a fluid buffer section spaced from an outer wall of the mechanical seal; the axial length of the mechanical seal in the through hole is smaller than that of the through hole; and the space between the inner wall of the fluid buffer section and the outer wall and the end face of the mechanical seal forms the open buffer cavity.
With reference to the first aspect, in a possible implementation manner, an inner diameter of the mechanical seal section is smaller than an inner diameter of the fluid buffer section, and an outer diameter of the mechanical seal at the fluid buffer section is smaller than an outer diameter of the mechanical seal section at the mechanical seal section.
With reference to the first aspect, in a possible implementation manner, the feeding channel includes an initial feeding section and a feeding buffer section communicated with the initial feeding section, and a cross-sectional area of the feeding buffer section is larger than a cross-sectional area of the initial feeding section in a direction perpendicular to a fluid flow direction.
With reference to the first aspect, in a possible implementation manner, the initial feeding section has a conical cross section along the fluid flowing direction, and the conical structure gradually reduces in diameter along the fluid flowing direction.
With reference to the first aspect, in a possible implementation manner, an instantaneous axis of the feeding buffer section in the fluid flow direction and an axis of the initial feeding section in the fluid flow direction form an included angle.
With reference to the first aspect, in a possible implementation manner, the feeding buffer section has an expansion cavity on a side away from the mechanical seal, and the expansion cavity expands in an expansion direction away from the mechanical seal.
With reference to the first aspect, in a possible implementation manner, the feeding buffer section has a flow guiding inclined plane on a side close to the mechanical seal, and the flow guiding inclined plane is inclined towards a direction away from the mechanical seal.
In a second aspect, an embodiment of the present invention further provides a high-lift two-stage slurry pump, which includes a rotating shaft, and a low-pressure side bearing assembly, a first-stage feeding section, a two-stage impeller assembly, a second-stage feeding section, and a high-pressure side bearing assembly sequentially disposed on the rotating shaft, where the high-lift two-stage slurry pump mechanical seal cavity structure is disposed between the first-stage feeding section and the rotating shaft, and between the second-stage feeding section and the rotating shaft.
Compared with the prior art, the mechanical seal cavity structure of the high-lift two-stage slurry pump and the high-lift two-stage slurry pump provided by the utility model have the beneficial effects that: the mechanical seal cavity of the two-stage feeding section is communicated with the feeding channel without obstacles, fluid enters the open buffer cavity through the feeding channel and flows at a reduced speed due to the increased space of the open buffer cavity, the open buffer cavity is filled with the fluid, and the fluid changes direction under the blockage of the mechanical seal and flows back to the feeding channel.
The open cushion chamber that this embodiment set up, because mechanical seal is closely sealed between pivot and pan feeding section, in open cushion chamber, the fluid is mobility all the time, can not bond to mechanical seal, also can not have the granule card to die between mechanical seal and feeding section and pivot, consequently, the risk to mechanical seal damage inefficacy has been reduced, the risk to the pivot wearing and tearing has been delayed, thereby the fault rate of equipment has been reduced, cost of maintenance and maintenance frequency have been reduced, the service life of equipment has been improved, the normal operating of production has been guaranteed.
Drawings
Fig. 1 is a schematic structural view of a mechanical seal of a first-stage feeding section of a mechanical seal cavity structure of a high-lift two-stage slurry pump according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first-stage feeding section of a mechanical seal cavity structure of a high-lift two-stage slurry pump according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a secondary feeding section mechanical seal of a mechanical seal cavity structure of a high-lift two-stage slurry pump according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a high-lift two-stage slurry pump according to an embodiment of the present invention;
FIG. 5 is a sectional view taken along line A-A of FIG. 4;
FIG. 6 is a schematic structural diagram of a primary feed section mechanical seal provided by the prior art;
description of reference numerals:
1. a low side bearing assembly; 2. mechanical sealing; 3. an open buffer chamber; 4. a dual stage impeller assembly; 5. a volute; 6. bending the pipe; 7. a secondary feeding section; 8. a high pressure side bearing assembly; 9. a feeding channel; 91. an initial feeding section; 92. a feeding buffer section; 921. expanding the cavity; 922. a diversion bevel; 10. a first-stage feeding section; 101. a step collar; 11. a through hole; 111. a mechanical seal section; 112. a fluid buffer section; 12. a rotating shaft.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1 to 3 together, the mechanical seal cavity structure of the high-lift two-stage slurry pump according to the present invention will now be described. The mechanical seal cavity structure of the high-lift two-stage slurry pump comprises a rotating shaft 12, two-stage feeding sections and two mechanical seals 2, wherein the two-stage feeding sections are respectively arranged at two ends of the rotating shaft 12, the two mechanical seals 2 are correspondingly arranged between the feeding sections and the rotating shaft 12, the feeding sections are provided with feeding channels 9 and through holes 11 through which the rotating shaft 12 penetrates, a mechanical seal cavity is formed between the rotating shaft 12 and the inner walls of the through holes 11, and the feeding channels 9 are communicated with the mechanical seal cavity without obstacles; the mechanical seal 2 is sealed at one end of the mechanical seal cavity far away from the feeding channel 9; the mechanical seal cavity is provided with an open buffer cavity 3 communicated with the feeding channel 9 after the mechanical seal 2 is installed.
Compared with the prior art, the mechanical seal cavity structure of the high-lift two-stage slurry pump provided by the embodiment has the advantages that the mechanical seal cavity of the two-stage feeding section is communicated with the feeding channel 9 without obstacles, fluid reaches the open type buffer cavity 3 after entering through the feeding channel 9, the fluid flows at a reduced speed due to the increase of the space of the open type buffer cavity 3, fills the open type buffer cavity 3 with the fluid, changes the direction under the blocking of mechanical seal, and flows back to the feeding channel 9. The open cushion chamber 3 that this embodiment set up, because mechanical seal is closely sealed between pivot 12 and pan feeding section, in open cushion chamber 3, the fluid is mobility all the time, can not bond to mechanical seal on, also can not have the granule card to die between mechanical seal and feeding section and pivot 12, consequently, the risk of losing efficacy to mechanical seal damage has been reduced, the risk of 12 wearing and tearing of counter shaft has been delayed, thereby the fault rate of equipment has been reduced, cost of maintenance and maintenance frequency have been reduced, the service life of equipment has been improved, the normal operating of production has been guaranteed.
The two-stage inlet section referred to in this embodiment, referring to fig. 5, includes a first-stage inlet section 10 and a second-stage inlet section 7, and although the positions of the first-stage inlet section 10 and the second-stage inlet section 7 in the slurry pump are different, since the mechanical seal cavities of the two inlet sections have the same structure, only the features of one inlet section are described herein.
In some embodiments, the above-mentioned features are provided in the through hole 11 of the material feeding section, as shown in fig. 1 to 5, the through hole 11 includes a mechanical seal section 111 closely matching with the mechanical seal 2 and a fluid buffer section 112 spaced from the outer wall of the mechanical seal 2; the axial length of the mechanical seal 2 in the through hole 11 is smaller than that of the through hole 11; the space between the inner wall of the fluid buffer section 112 and the outer wall and end face of the mechanical seal 2 forms an open buffer chamber 3. The mechanical seal section 111 of the through hole 11 is closely attached to the mechanical seal to seal fluid, and a space is formed between the fluid buffer section 112 and the mechanical seal 2, so that the space of the open buffer cavity 3 is enlarged, the fluid is decelerated at the space, the impact on the mechanical seal 2 is reduced, and the service life of the mechanical seal is prolonged.
In order to further increase the space of the open buffer chamber 3, referring to fig. 2, the impact force of the fluid is decelerated, as an embodiment of the mechanical seal 2 provided in this embodiment, the inner diameter of the mechanical seal section 111 is smaller than the inner diameter of the fluid buffer section 112, and the outer diameter of the mechanical seal 2 at the fluid buffer section 112 is smaller than the outer diameter at the mechanical seal section 111. Here, the mechanical seal section 111 and the fluid buffer section 112 form a small step, and the impact of the fluid on the small step can be dispersed to the step on the mechanical seal 2, thereby prolonging the service life of the mechanical seal.
On the basis of the through hole 11, referring to fig. 1 to 3, as an embodiment of the feeding channel 9, the feeding channel 9 includes an initial feeding section 91 and a feeding buffer section 92 communicated with the initial feeding section 91, a cross-sectional area of the feeding buffer section 92 is larger than a cross-sectional area of the initial feeding section 91 in a direction perpendicular to a fluid flow, and the feeding buffer section 92 is upstream of the developing buffer chamber. Pan feeding passageway 9 is not the straight line and strikes, through pan feeding buffering section 92 that sets up, can tentatively realize the buffering of slowing down when the fluid reachs mechanical seal cavity, reachs mechanical seal cavity department again when, further slows down to the fluid to reduce the impact to mechanical seal, improve mechanical seal's life.
As an improved embodiment of the above-mentioned feed channel 9, with reference to fig. 1 to 3, the initial feed section 91 is conical in cross section in the direction of fluid flow, and the conical structure gradually decreases in diameter in the direction of fluid flow. Through the structural change of the feeding channel 9, after the fluid enters the feeding channel 9, the fluid contracts through the conical structure and then passes through the feeding buffer section 92, and the speed of the fluid is improved
As shown in fig. 1 to 3, on the basis of the conical initial feeding section 91, the instantaneous axis of the feeding buffer section 92 in the fluid flow direction is arranged at an angle to the axis of the initial feeding section 91 in the fluid flow direction. Through the setting of contained angle, change the direction that the fluid flows to reduce the wearing and tearing of fluid to equipment.
As shown in fig. 1 to 3, in another embodiment of the feed channel 9, the feed buffer section 92 has an expansion volume 921 on a side away from the mechanical seal 2, and the expansion volume 921 expands in a direction away from the mechanical seal 2. Through the expanding cavity 921, the fluid is buffered, the flow velocity of the fluid is reduced, and the impact damage to the equipment is reduced.
Specifically, as shown in fig. 1 to 3, in the present embodiment, the feeding channel 9 is modified in such a way that the feeding buffer section 92 has a diversion inclined plane 922 on a side close to the mechanical seal 2, and the diversion inclined plane 922 inclines away from the mechanical seal 2. Through the arranged flow guide inclined plane 922, the flow direction of the fluid is changed, and impact damage to the equipment is reduced.
Based on the same inventive concept, referring to fig. 4 and 5, an embodiment of the present invention further provides a high-lift two-stage slurry pump, which includes a rotating shaft 12, and a low-pressure side bearing assembly 1, a first-stage feeding section 10, a two-stage impeller assembly 4, a second-stage feeding section 7, and a high-pressure side bearing assembly 8 which are sequentially disposed on the rotating shaft 12, wherein a high-lift two-stage slurry pump mechanical seal cavity structure is disposed between the first-stage feeding section 10, the second-stage feeding section 7, and the rotating shaft 12. Wherein, the double-stage impeller is arranged in the volute 5, and the elbow 6 is connected on the volute 5. Fluid enters the feeding channel 9 of the secondary feeding section 7 through the high-speed rotation of the two-stage impeller after being decelerated by the feeding channel 9 of the primary feeding section 10 on the low-pressure side, and is discharged from the discharge hole on the high-pressure side. Wherein, in fig. 5, C is a feeding port, and B is a discharging port.
It should be noted that, in the high-lift two-stage slurry pump in fig. 5, in order to improve the intuitiveness, the position of the discharge port is shown in fig. 5 after being rotated, and is located on the same side of the rotating shaft as the first-stage feeding section.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A high-lift two-stage slurry pump mechanical seal cavity structure comprises a rotating shaft (12), two stages of feeding sections and two mechanical seals (2), wherein the two stages of feeding sections are respectively arranged at two ends of the rotating shaft (12), the two mechanical seals are correspondingly arranged between the feeding sections and the rotating shaft (12), and the high-lift two-stage slurry pump mechanical seal cavity structure is characterized in that,
the feeding section is provided with a feeding channel (9) and a through hole (11) through which the rotating shaft (12) penetrates, a mechanical seal cavity is formed between the rotating shaft (12) and the inner wall of the through hole (11), and the feeding channel (9) is communicated with the mechanical seal cavity without obstacles;
the mechanical seal (2) is sealed at one end of the mechanical seal cavity far away from the feeding channel (9); the mechanical seal cavity is provided with an open buffer cavity (3) communicated with the feeding channel (9) after the mechanical seal cavity is installed for mechanical seal.
2. The high-lift dual-stage slurry pump mechanical seal cavity structure according to claim 1, wherein the through hole (11) comprises a mechanical seal section (111) closely matched with the mechanical seal (2) and a fluid buffer section (112) spaced from the outer wall of the mechanical seal (2); the axial length of the mechanical seal (2) in the through hole (11) is smaller than that of the through hole (11); the space between the inner wall of the fluid buffer section (112) and the outer wall and the end face of the mechanical seal (2) forms the open buffer cavity (3).
3. A high-lift dual-stage slurry pump mechanical seal cavity structure according to claim 2, wherein the inner diameter of the mechanical seal section (111) is smaller than the inner diameter of the fluid buffer section (112), and the outer diameter of the mechanical seal (2) at the fluid buffer section (112) is smaller than the outer diameter thereof at the mechanical seal section (111).
4. A high-lift dual-stage slurry pump mechanical seal chamber structure as claimed in any one of claims 1 to 3, wherein said feed channel (9) comprises an initial feed section (91) and a feed buffer section (92) communicating with said initial feed section (91), the cross-sectional area of said feed buffer section (92) being greater than the cross-sectional area of said initial feed section (91) in a direction perpendicular to the fluid flow.
5. The high-lift dual-stage slurry pump mechanical seal cavity structure as recited in claim 4, wherein the initial charge section (91) is conical in cross-section in the direction of fluid flow, and the conical structure is tapered in diameter in the direction of fluid flow.
6. The mechanical seal cavity structure of the high-lift double-stage slurry pump according to claim 4, wherein an instantaneous axis of the feeding buffer section (92) in the fluid flow direction and an axis of the initial feeding section (91) in the fluid flow direction form an included angle.
7. The high-lift double-stage slurry pump mechanical seal cavity structure as claimed in claim 6, wherein the feeding buffer section (92) is provided with an expansion cavity (921) at a side far away from the mechanical seal (2), and the expansion cavity (921) expands in a direction far away from the mechanical seal (2).
8. The mechanical seal cavity structure of the high-lift double-stage slurry pump according to claim 7, wherein the feeding buffer section (92) is provided with a flow guiding inclined plane (922) at one side close to the mechanical seal (2), and the flow guiding inclined plane (922) inclines towards the direction far away from the mechanical seal (2).
9. A high-lift two-stage slurry pump comprises a rotating shaft (12) and a low-pressure side bearing assembly (1), a first-stage feeding section, a two-stage impeller assembly (4), a second-stage feeding section and a high-pressure side bearing assembly (8) which are sequentially arranged on the rotating shaft (12), and is characterized in that the mechanical seal cavity structure of the high-lift two-stage slurry pump is arranged between the first-stage feeding section and the second-stage feeding section and the rotating shaft (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122310059.9U CN215672852U (en) | 2021-09-23 | 2021-09-23 | High-lift two-stage slurry pump mechanical seal cavity structure and high-lift two-stage slurry pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122310059.9U CN215672852U (en) | 2021-09-23 | 2021-09-23 | High-lift two-stage slurry pump mechanical seal cavity structure and high-lift two-stage slurry pump |
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| CN215672852U true CN215672852U (en) | 2022-01-28 |
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| CN202122310059.9U Active CN215672852U (en) | 2021-09-23 | 2021-09-23 | High-lift two-stage slurry pump mechanical seal cavity structure and high-lift two-stage slurry pump |
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