Centrifugal pump
By designing a multi-protruding arrangement of impellers and volutes with anti-wear layers in centrifugal pumps, the wear and cavitation problems during solid-liquid two-phase flow transport is solved, and more stable and low-noise operation is achieved, and equipment life is extended .
Patent Information
- Application Number
- CN202421102114.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-21
AI Technical Summary
When existing centrifugal pumps convey solid and liquid flow, the interaction between solid particles and pump components leads to wear and damage, increasing flow resistance, causing vibration and noise, and affecting safe and reliable operation.
A centrifugal pump consisting of an impeller anti-wear layer and a volute shell anti-wear layer is designed. The impeller anti-wear layer and volute shell anti-wear layer are both layered structures arranged in multiple convex arrangements, which are used to rebound solid particles and buffer air. The microjet formed by bubble rupture reduces abrasion and cavitation.
It effectively weakens and suppresses the abrasion and cavitation of the internal components of the centrifugal pump, ensures the safe and reliable operation of the pump, extends the service life, and reduces vibration and noise.
Smart Images
Figure CN222315395U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solid-liquid two-phase flow delivery pumps, in particular to a centrifugal pump. Background Art
[0002] Centrifugal pumps are widely used in fluid transportation fields such as water conservancy, aerospace, energy, shipping and household use. Their function is equivalent to that of a human heart and they are important equipment related to the national economy and people's livelihood.
[0003] When the fluid transported by the centrifugal pump contains solid particles, it is a typical solid-liquid two-phase flow. Due to the interaction between the solid particles and the flow components of the centrifugal pump, the surface materials of the flow components of the centrifugal pump (such as impellers, pump casings, etc.) are worn and damaged, resulting in an increase in fluid flow resistance, which not only reduces the efficiency of the centrifugal pump, but also causes strong vibration and noise, seriously affecting the safe and reliable operation of the unit.
[0004] It can be seen that how to provide a centrifugal pump that is resistant to abrasion and cavitation is a problem that needs to be solved urgently. Utility Model Content
[0005] The utility model aims to provide a centrifugal pump to solve the problems existing in the above-mentioned prior art. When carrying out solid-liquid two-phase flow transportation, it can resist abrasion and cavitation, and has the advantages of simple structure, high efficiency and reliability, and stable operation.
[0006] To achieve the above purpose, the utility model provides the following solutions:
[0007] The utility model provides a centrifugal pump, comprising a volute, a pump cover and a motor connected in sequence, wherein an impeller is arranged in the volute, and the impeller is connected to the output end of the motor through a rotating shaft and a coupling; further comprising an impeller anti-wear layer and a volute anti-wear layer, wherein the impeller anti-wear layer is arranged on the surface of a part of the impeller that is prone to wear, and the volute anti-wear layer is arranged on the surface of a part of the volute that is prone to wear; both the impeller anti-wear layer and the volute anti-wear layer are layered structures formed by arranging a plurality of protrusions, and when the centrifugal pump conveys fluid, the protrusions can rebound solid particles in the fluid in the impeller flow channel, and when cavitation occurs in the centrifugal pump, the protrusions can buffer microjets formed by the collapse of cavitation bubbles in the impeller flow channel.
[0008] Preferably, the impeller anti-wear layer includes a blade back layer, a blade working surface layer and an impeller rear cover layer, the blade back layer is arranged at the easily abraded portion of the blade back of the impeller, the blade working surface layer is arranged at the easily abraded portion of the blade working surface of the impeller, and the impeller rear cover layer is arranged at the easily abraded portion of the rear cover of the impeller.
[0009] Preferably, the blade back layer includes a first area layer, a second area layer and a third area layer, wherein the first area layer is arranged on the back of the impeller blade at a position close to the blade inlet, the second area layer is arranged on the back of the impeller blade at a position close to the blade outlet, and the third area layer is arranged on the back of the impeller blade at a position close to the junction of the impeller rear cover plate and the blade back; the protrusions of the first area layer, the protrusions of the second area layer and the protrusions of the third area layer are all arranged in a row along the chord length direction of the impeller blade at corresponding positions.
[0010] Preferably, the coverage area length of the first area layer is 1 / 4 of the total length of the impeller blades; the coverage area length of the second area layer is 1 / 4 of the total length of the impeller blades; and the coverage area length of the third area layer is 1 / 2 of the total length of the impeller blades.
[0011] Preferably, the blade working surface layer includes a fourth area layer and a fifth area layer, wherein the fourth area layer is arranged on the blade working surface of the impeller at a position close to the blade inlet, and the fifth area layer is arranged on the blade working surface of the impeller at a position close to the blade outlet; the protrusions of the fourth area layer and the protrusions of the fifth area layer are arranged in a row along the blade chord length direction of the impeller at corresponding positions.
[0012] Preferably, the coverage area length of the fourth region layer is 1 / 4 of the total length of the blades of the impeller; the coverage area length of the fifth region layer is 1 / 4 of the total length of the blades of the impeller.
[0013] Preferably, the impeller rear cover layer includes a sixth area layer, a seventh area layer and an eighth area layer, wherein the sixth area layer is arranged on the rear cover of the impeller at a position close to the blade inlet, the seventh area layer is arranged on the rear cover of the impeller at a position close to the blade outlet, and the eighth area layer is arranged on the rear cover of the impeller at a position close to the back of the blade; the protrusions of the sixth area layer, the protrusions of the seventh area layer and the protrusions of the eighth area layer are all arranged in a row along the chord length direction of the impeller blades at corresponding positions.
[0014] Preferably, the coverage area length of the sixth area layer is 1 / 4 of the total length of the impeller blades; the coverage area length of the seventh area layer is 1 / 4 of the total length of the impeller blades; the coverage area length of the eighth area layer is 1 / 2 of the total length of the impeller blades, and the coverage area width of the eighth area layer is 1 / 3 of the total width of the impeller blades.
[0015] Preferably, the volute anti-wear layer is provided on the surface of the tongue of the volute; the protrusions of the volute anti-wear layer are arranged in a row along the axial direction parallel to the volute, and are arranged in a staggered manner along the axial direction perpendicular to the volute.
[0016] Preferably, the protrusion is a hemispherical structure.
[0017] Compared with the prior art, the utility model has achieved the following technical effects:
[0018] The centrifugal pump provided by the utility model comprises a volute, a pump cover and a motor connected in sequence, wherein an impeller is arranged in the volute, and further comprises an impeller anti-wear layer and a volute anti-wear layer, wherein both the impeller anti-wear layer and the volute anti-wear layer are layered structures formed by arranging a plurality of protrusions, and the impeller anti-wear layer is arranged on the surface of a part prone to abrasion of the impeller, and the volute anti-wear layer is arranged on the surface of a part prone to abrasion of the volute, when the centrifugal pump conveys fluid, the protrusions can rebound solid particles in the fluid in the impeller flow channel, and when cavitation occurs in the centrifugal pump, the protrusions can buffer microjets formed by the collapse of cavitation bubbles in the impeller flow channel, thereby effectively weakening and inhibiting the abrasion and cavitation of the internal flow components of the centrifugal pump, thereby ensuring the safe and reliable operation of the centrifugal pump, extending the service life of the centrifugal pump, and reducing the vibration and noise of the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 A partial cross-sectional view of a centrifugal pump provided in an embodiment of the utility model;
[0021] Figure 2 A schematic diagram of a solid particle in a protrusion rebounding fluid provided by an embodiment of the utility model;
[0022] Figure 3 A schematic diagram of a blade back layer provided in an embodiment of the utility model being arranged at a position prone to abrasion on the back of an impeller blade;
[0023] Figure 4 A schematic diagram of a blade working surface layer provided in an embodiment of the utility model being arranged at a portion of the blade working surface of an impeller that is susceptible to abrasion;
[0024] Figure 5 A schematic diagram of an impeller rear cover layer provided in an embodiment of the utility model being arranged at a position of the impeller rear cover that is prone to abrasion;
[0025] Figure 6 A schematic diagram of a volute anti-abrasion layer provided in an embodiment of the utility model being arranged on the surface of the volute tongue.
[0026] In the figure: 01-solid particles, 1-volute, 101-flange, 2-pump cover, 3-motor, 4-impeller, 401-blades, 402-rear cover, 5-rotating shaft, 6-impeller anti-wear layer, 601-first area layer, 602-second area layer, 603-third area layer, 604-fourth area layer, 605-fifth area layer, 606-sixth area layer, 607-seventh area layer, 608-eighth area layer, 7-volute anti-wear layer, 8-protrusion. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] The utility model aims to provide a centrifugal pump to solve the problems existing in the prior art. When carrying out solid-liquid two-phase flow transportation, the centrifugal pump can resist abrasion and cavitation and has the advantages of simple structure, high efficiency and reliability, and stable operation.
[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0030] like Figure 1 As shown, this embodiment provides a centrifugal pump, including a volute 1, a pump cover 2 and a motor 3 connected in sequence, the pump cover 2 is connected to the end face of the volute 1 by bolts, an impeller 4 is arranged in the volute 1, and the impeller 4 is connected to the output end of the motor 3 through a rotating shaft 5 and a coupling; it also includes an impeller anti-wear layer 6 and a volute anti-wear layer 7, the impeller anti-wear layer 6 is arranged on the surface of the easily abraded part of the impeller 4, and the volute anti-wear layer 7 is arranged on the surface of the easily abraded part of the volute 1; the impeller anti-wear layer 6 and the volute anti-wear layer 7 are both layered structures formed by a plurality of protrusions 8 arranged, and specifically, the protrusions 8 in this embodiment are preferably hemispherical structures; when the centrifugal pump conveys fluid, such as Figure 2 As shown, the protrusion 8 can rebound the solid particles 01 in the fluid in the flow channel of the impeller 4. When cavitation occurs in the centrifugal pump, the protrusion 8 can buffer the micro-jets formed by the collapse of cavitation bubbles in the flow channel of the impeller 4, thereby effectively weakening and suppressing the abrasion and cavitation of the flow components inside the centrifugal pump, thereby ensuring the safe and reliable operation of the centrifugal pump, extending the service life of the centrifugal pump, and reducing the vibration and noise of the centrifugal pump.
[0031] It should be noted that, according to previous numerical simulation studies, experimental studies and actual engineering operations, the parts of the centrifugal pump most susceptible to abrasion under sandy conditions are mainly concentrated in the inlet and outlet areas of the blades 401 of the impeller 4, the area on the back of the blades 401 close to the rear cover plate 402, and the area between the rear cover plate 402 of the impeller 4 and the tongue 101 of the volute 1. Based on this, the impeller anti-wear layer 6 and the volute anti-wear layer 7 are designed.
[0032] In this embodiment, the impeller anti-wear layer 6 includes a blade back layer, a blade working surface layer and an impeller rear cover layer. The blade back layer is arranged at the easily abraded portion of the back of the blade 401 of the impeller 4, the blade working surface layer is arranged at the easily abraded portion of the working surface of the blade 401 of the impeller 4, and the impeller rear cover layer is arranged at the easily abraded portion of the rear cover 402 of the impeller 4.
[0033] like Figure 3 As shown, the blade back layer includes a first area layer 601, a second area layer 602 and a third area layer 603, wherein the first area layer 601 is arranged on the back of the blade 401 of the impeller 4 at a position close to the inlet of the blade 401, the second area layer 602 is arranged on the back of the blade 401 of the impeller 4 at a position close to the outlet of the blade 401, and the third area layer 603 is arranged on the back of the blade 401 of the impeller 4 at a position close to the junction of the rear cover plate 402 of the impeller 4 and the back of the blade 401; the protrusion 8 of the first area layer 601, the protrusion 8 of the second area layer 602 and the protrusion 8 of the third area layer 603 are all arranged in a row along the chord length direction of the blade 401 of the impeller 4 at the corresponding position.
[0034] Furthermore, the coverage area length of the first region layer 601 is 1 / 4 of the total length of the blades 401 of the impeller 4; the coverage area length of the second region layer 602 is 1 / 4 of the total length of the blades 401 of the impeller 4; and the coverage area length of the third region layer 603 is 1 / 2 of the total length of the blades 401 of the impeller 4.
[0035] like Figure 4 As shown, the blade working surface layer includes a fourth area layer 604 and a fifth area layer 605, wherein the fourth area layer 604 is arranged on the working surface of the blade 401 of the impeller 4 at a position close to the inlet of the blade 401, and the fifth area layer 605 is arranged on the working surface of the blade 401 of the impeller 4 at a position close to the outlet of the blade 401; the protrusions 8 of the fourth area layer 604 and the protrusions 8 of the fifth area layer 605 are arranged in a row along the chord length direction of the blade 401 of the impeller 4 at the corresponding positions.
[0036] Furthermore, the coverage area length of the fourth region layer 604 is 1 / 4 of the total length of the blades 401 of the impeller 4 ; the coverage area length of the fifth region layer 605 is 1 / 4 of the total length of the blades 401 of the impeller 4 .
[0037] like Figure 5 As shown, the impeller rear cover layer includes a sixth area layer 606, a seventh area layer 607 and an eighth area layer 608, wherein the sixth area layer 606 is arranged on the rear cover 402 of the impeller 4 at a position close to the inlet of the blade 401, the seventh area layer 607 is arranged on the rear cover 402 of the impeller 4 at a position close to the outlet of the blade 401, and the eighth area layer 608 is arranged on the rear cover 402 of the impeller 4 at a position close to the back of the blade 401; the protrusion 8 of the sixth area layer 606, the protrusion 8 of the seventh area layer 607 and the protrusion 8 of the eighth area layer 608 are all arranged in a row along the chord length direction of the blade 401 of the impeller 4 at the corresponding position.
[0038] Furthermore, the coverage area length of the sixth regional layer 606 is 1 / 4 of the total length of the blades 401 of the impeller 4; the coverage area length of the seventh regional layer 607 is 1 / 4 of the total length of the blades 401 of the impeller 4; the coverage area length of the eighth regional layer 608 is 1 / 2 of the total length of the blades 401 of the impeller 4, and the coverage area width of the eighth regional layer 608 is 1 / 3 of the total width of the blades 401 of the impeller 4.
[0039] It should be noted that the size and number of the protrusions 8 on the blades 401 of the impeller 4 and the rear cover plate 402 can be determined by those skilled in the art according to the size of the blades 401 of the impeller 4 and the rear cover plate 402 .
[0040] It should be noted that Figure 3-Figure 5 In the figure, the circled area in each frame represents the approximate location of the corresponding anti-wear layer.
[0041] In this embodiment, if Figure 6 As shown, the volute anti-wear layer 7 is provided on the surface of the tongue 101 of the volute 1 ; the protrusions 8 of the volute anti-wear layer 7 are arranged in a row along the axial direction parallel to the volute 1 , and are arranged in a staggered manner along the axial direction perpendicular to the volute 1 .
[0042] It should be noted that the size and number of the protrusions 8 on the partition tongue 101 of the volute 1 can be determined by those skilled in the art according to the size of the partition tongue 101 of the volute 1 .
[0043] In this embodiment, the hemispherical protrusions 8 are arranged on the easily abraded surface of the impeller 4 of the centrifugal pump and the easily abraded surface of the volute 1 as follows:
[0044] First, when the centrifugal pump conveys fluid, the solid particles 01 in the fluid in the flow channel of the impeller 4 contact the protrusions 8 and will be rebounded to the surface of the blades 401 and the flow area at the rear cover plate 402 away from the impeller 4, as well as the flow area at the baffle 101 away from the volute 1, thereby reducing the abrasion of the solid particles 01 on the impeller 4 and the baffle 101 of the volute 1; secondly, when cavitation occurs in the centrifugal pump, the cavitation bubbles in the flow channel of the impeller 4 will collapse along with the mainstream movement to the outlet area of the impeller 4 and the baffle 101 area of the volute 1. At this time, the protrusions 8 have a buffering effect on the microjets formed by the collapse of the cavitation bubbles, thereby reducing the strong impact of cavitation on the structural wall of the impeller 4 and the baffle 101 of the volute 1, and reducing the effects of cavitation on the centrifugal pump, such as material damage, efficiency reduction, vibration and noise.
[0045] Therefore, under the action of the layered structure formed by a plurality of protrusions 8, the abrasion and cavitation of the flow-through parts inside the centrifugal pump will be greatly weakened and suppressed, thereby ensuring the safe and reliable operation of the centrifugal pump, extending the service life of the centrifugal pump, and reducing the vibration and noise of the centrifugal pump. This type of pump can be widely used in the field of solid-liquid two-phase flow transportation.
[0046] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. A centrifugal pump, comprising a volute, a pump cover and a motor connected in sequence, wherein an impeller is arranged in the volute, and the impeller is connected to the output end of the motor through a rotating shaft and a coupling; characterized in that: It also includes an impeller anti-wear layer and a volute anti-wear layer, wherein the impeller anti-wear layer is arranged on the surface of the easily abraded part of the impeller, and the volute anti-wear layer is arranged on the surface of the easily abraded part of the volute; the impeller anti-wear layer and the volute anti-wear layer are both layered structures formed by a plurality of protrusions, and when the centrifugal pump conveys fluid, the protrusions can rebound solid particles in the fluid in the impeller flow channel, and when cavitation occurs in the centrifugal pump, the protrusions can buffer the microjets formed by the collapse of cavitation bubbles in the impeller flow channel.
2. The centrifugal pump according to claim 1, characterized in that: The impeller anti-wear layer includes a blade back layer, a blade working surface layer and an impeller rear cover layer. The blade back layer is arranged at the easily abraded portion of the blade back of the impeller, the blade working surface layer is arranged at the easily abraded portion of the blade working surface of the impeller, and the impeller rear cover layer is arranged at the easily abraded portion of the rear cover of the impeller.
3. The centrifugal pump according to claim 2, characterized in that: The blade back layer includes a first area layer, a second area layer and a third area layer, wherein the first area layer is arranged on the back of the impeller blade at a position close to the blade inlet, the second area layer is arranged on the back of the impeller blade at a position close to the blade outlet, and the third area layer is arranged on the back of the impeller blade at a position close to the junction between the impeller rear cover plate and the blade back; the protrusions of the first area layer, the protrusions of the second area layer and the protrusions of the third area layer are all arranged in a row along the chord length direction of the impeller blade at corresponding positions.
4. The centrifugal pump according to claim 3, characterized in that: The coverage area length of the first area layer is 1 / 4 of the total length of the impeller blades; the coverage area length of the second area layer is 1 / 4 of the total length of the impeller blades; the coverage area length of the third area layer is 1 / 2 of the total length of the impeller blades.
5. The centrifugal pump according to claim 2, characterized in that: The blade working surface layer includes a fourth area layer and a fifth area layer, wherein the fourth area layer is arranged on the blade working surface of the impeller at a position close to the blade inlet, and the fifth area layer is arranged on the blade working surface of the impeller at a position close to the blade outlet; the protrusions of the fourth area layer and the protrusions of the fifth area layer are arranged in a row along the chord length direction of the impeller blade at corresponding positions.
6. The centrifugal pump according to claim 5, characterized in that: The coverage area length of the fourth region layer is 1 / 4 of the total length of the blades of the impeller; the coverage area length of the fifth region layer is 1 / 4 of the total length of the blades of the impeller.
7. The centrifugal pump according to claim 2, characterized in that: The impeller rear cover layer includes a sixth area layer, a seventh area layer and an eighth area layer, wherein the sixth area layer is arranged on the rear cover of the impeller at a position close to the blade inlet, the seventh area layer is arranged on the rear cover of the impeller at a position close to the blade outlet, and the eighth area layer is arranged on the rear cover of the impeller at a position close to the back of the blade; the protrusions of the sixth area layer, the protrusions of the seventh area layer and the protrusions of the eighth area layer are all arranged in a row along the chord length direction of the impeller blades at corresponding positions.
8. The centrifugal pump according to claim 7, characterized in that: The coverage area length of the sixth area layer is 1 / 4 of the total length of the impeller blades; the coverage area length of the seventh area layer is 1 / 4 of the total length of the impeller blades; the coverage area length of the eighth area layer is 1 / 2 of the total length of the impeller blades, and the coverage area width of the eighth area layer is 1 / 3 of the total width of the impeller blades.
9. The centrifugal pump according to claim 1, characterized in that: The volute anti-wear layer is arranged on the surface of the volute tongue; the protrusions of the volute anti-wear layer are arranged in a row along the axial direction parallel to the volute, and are arranged in a staggered manner along the axial direction perpendicular to the volute.
10. The centrifugal pump according to any one of claims 1 to 9, characterized in that: The protrusion is a hemispherical structure.