CN112196827A - Anti-cavitation water pump - Google Patents

Anti-cavitation water pump Download PDF

Info

Publication number
CN112196827A
CN112196827A CN202011105171.2A CN202011105171A CN112196827A CN 112196827 A CN112196827 A CN 112196827A CN 202011105171 A CN202011105171 A CN 202011105171A CN 112196827 A CN112196827 A CN 112196827A
Authority
CN
China
Prior art keywords
pump
water
cavitation
inducer
pump body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011105171.2A
Other languages
Chinese (zh)
Inventor
马灿
张克龙
李勇全
王苇
林原胜
柯志武
赵振兴
苟金澜
劳星胜
李勇
代路
柯汉兵
肖颀
陈列
宋苹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan No 2 Ship Design Institute No 719 Research Institute of China Shipbuilding Industry Corp
Original Assignee
Wuhan No 2 Ship Design Institute No 719 Research Institute of China Shipbuilding Industry Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan No 2 Ship Design Institute No 719 Research Institute of China Shipbuilding Industry Corp filed Critical Wuhan No 2 Ship Design Institute No 719 Research Institute of China Shipbuilding Industry Corp
Priority to CN202011105171.2A priority Critical patent/CN112196827A/en
Publication of CN112196827A publication Critical patent/CN112196827A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2238—Special flow patterns
    • F04D29/225—Channel wheels, e.g. one blade or one flow channel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/181—Axial flow rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/528—Casings; Connections of working fluid for axial pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The embodiment of the invention provides an anti-cavitation water pump which comprises a pump body, a pump shaft, a main impeller and an inducer, wherein the main impeller is arranged on the pump shaft; the pump body still is equipped with the bypass runner in circumference, and the one end intercommunication inducer's of bypass runner leaf top region, the other end intercommunication pump body of bypass runner intake region. According to the anti-cavitation water pump, the bypass flow channel is arranged in the circumferential direction of the pump body, the blade top area of the inducer is communicated with the water inlet area of the water pump, so that part of water flowing into the inducer returns to the water inlet area of the pump, and local water flow circulation is formed. The water flow circulation is naturally driven by the water flow pressure difference, and the water flow circulation is generated during the operation of the pump without intervention and adjustment, so that the uniformity of water flow at the inlet of the water pump and in the inducer can be obviously improved, the cavitation of the water flow is inhibited, the cavitation allowance of the water pump is reduced, and the cavitation resistance of the water pump is further improved.

Description

Anti-cavitation water pump
Technical Field
The invention relates to the technical field of water pumps, in particular to an anti-cavitation water pump.
Background
The steam power system is a main power source of a large ship, the condensate pump is important equipment in the steam power system, and the function of the condensate pump is to continuously pressurize condensate water from the condenser and then convey the condensate water to the feed pump for further pressurization. Because the condenser as the water drawing source has higher vacuum degree and the condensed water temperature is close to the saturation temperature, the condensate pump is easy to generate cavitation. The cavitation phenomenon refers to a phenomenon that a metal wall surface is damaged due to repeated liquid vaporization and condensation processes in a condensate pump. When the pressure of liquid at a certain position in a pump inner flow passage of the condensate pump is reduced to be equal to or lower than the corresponding vaporization pressure at the current liquid temperature, bubbles can appear, the bubbles are mainly steam, and a certain amount of air is dissolved. When the bubble breaks near the wall surface, a large impact force is generated, and the material of the flow passage is damaged.
When the water pump generates cavitation, serious noise and vibration can be caused, the pump operates under the cavitation condition, high pressure generated when cavitation is broken frequently strikes on the overflowing part, so that materials are subjected to fatigue damage to generate mechanical degradation, meanwhile, air dissolved in liquid is separated out, the separated air can generate chemical corrosion on the materials, blades of a condensate pump can be directly damaged under the serious condition, and hidden dangers are brought to safe and stable operation of a power system.
Disclosure of Invention
The embodiment of the invention provides an anti-cavitation water pump, which is used for solving the problem that the water pump in the prior art is easy to generate cavitation and improving the anti-cavitation performance of the pump.
The embodiment of the invention provides an anti-cavitation water pump which comprises a pump body, a pump shaft, a main impeller and an inducer, wherein the main impeller is installed on the pump shaft; the pump body still is equipped with the bypass runner in circumference, the one end intercommunication of bypass runner the blade top region of inducer, the other end intercommunication of bypass runner the area of intaking of pump body.
According to the anti-cavitation water pump disclosed by the embodiment of the invention, the pump body is circumferentially provided with a first annular groove corresponding to the blade top area of the inducer, and the water inlet area of the pump body is circumferentially provided with a second annular groove; the bypass flow channel is an annular flow channel, one end of the annular flow channel is connected to the first annular groove, and the other end of the annular flow channel is connected to the second annular groove.
According to the anti-cavitation water pump disclosed by the embodiment of the invention, the annular flow channel and the annular part enclosed by the pump body are fixedly connected to the annular flow channel through a plurality of connecting pieces arranged in the annular flow channel.
According to the anti-cavitation water pump of one embodiment of the invention, the plurality of connecting pieces are arranged along the circumferential direction of the annular flow passage.
According to the anti-cavitation water pump disclosed by the embodiment of the invention, the bypass flow channel is a plurality of communicating pipes, one end of each communicating pipe is communicated with the blade top area of the inducer, and the other end of each communicating pipe is communicated with the water inlet area of the pump body.
According to the anti-cavitation water pump of one embodiment of the invention, the plurality of the communication pipes are symmetrically arranged along the circumferential direction of the pump body.
According to the anti-cavitation water pump disclosed by the embodiment of the invention, the inducer comprises a plurality of inducer blades uniformly arranged along the circumferential direction of the pump shaft, the main impeller comprises a plurality of main impeller blades uniformly arranged along the circumferential direction of the pump shaft, and the inducer blades and the main impeller blades are mutually independent or integrally connected.
According to the anti-cavitation water pump of one embodiment of the invention, the main impeller blades are either centrifugal blades or axial flow blades.
According to the anti-cavitation water pump provided by the embodiment of the invention, the inducer is arranged at the front end of the main impeller, and the inducer applies work to fluid so as to pressurize the liquid entering the rear main impeller, so that the effect of improving the cavitation performance of the pump is achieved; meanwhile, the bypass flow channel is arranged in the circumferential direction of the pump body, and the blade top area of the inducer is communicated with the water inlet area of the water pump, so that part of water flowing into the inducer returns to the water inlet area of the pump, and local water circulation is formed. The water flow circulation is naturally driven by the water flow pressure difference, and the water flow circulation is generated during the operation of the pump without intervention and adjustment, so that the uniformity of water flow at the inlet of the water pump and in the inducer can be obviously improved, the cavitation of the water flow is inhibited, the cavitation allowance of the water pump is reduced, and the cavitation resistance of the water pump is further improved. According to the anti-cavitation water pump, pressure difference is constructed between the inducer and the water inlet to naturally drive water flow circulation, the uniformity of water flow in the water inlet of the water pump and the inducer is improved, and the anti-cavitation performance of the water pump can be effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an anti-cavitation water pump according to an embodiment of the present invention.
Reference numerals:
1. a pump body; 11. A water inlet; 12. A water outlet;
13. a front cover plate; 14. A rear cover plate; 2. A pump shaft;
3. a main impeller; 4. An inducer; 5. A bypass flow channel;
61. a first annular groove; 62. A second annular groove; 7. An annular member;
8. a connecting member.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "first" and "second" are used for the sake of clarity in describing the numbering of the components of the product and do not represent any substantial difference, unless explicitly stated or limited otherwise. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships may also be changed accordingly. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
It is to be understood that, unless otherwise expressly specified or limited, the term "coupled" is used broadly, and may, for example, refer to directly coupled devices or indirectly coupled devices through intervening media. Specific meanings of the above terms in the embodiments of the invention will be understood to those of ordinary skill in the art in specific cases.
As shown in fig. 1, the anti-cavitation water pump provided by the embodiment of the present invention includes a pump body 1, a pump shaft 2, and a main impeller 3 installed on the pump shaft 2, wherein the pump body 1 is provided with a water inlet 11 and a water outlet 12, and further includes an inducer 4 installed on the pump shaft 2, and the inducer 4 is installed on one side of the main impeller 3 facing the water inlet 11. The pump body 1 still is equipped with bypass runner 5 in circumference, and the one end intercommunication inducer 4's of bypass runner 5 leaf top region, the other end intercommunication pump body 1 of bypass runner 5 intake region.
Specifically, the pump body 1 may have a cylindrical structure including a front cover plate 13 located at a front end of the main impeller 3 and a rear cover plate 14 located at a rear end of the main impeller 3. The main impeller 3 can be of a single-stage or multi-stage impeller structure, the first impeller is in a single-suction or double-suction mode, and the secondary impeller and the final impeller are universal and in a single-suction mode. The main impeller 3 is a core element for converting the energy of the prime mover into the energy of the pumped liquid, and the pump shaft 2 is used as a carrier of the main impeller 3 and transmits the whole load of the rotor of the prime mover. In the present embodiment, the main impeller 3 in the form of a single-stage single suction is mainly used as an example for explanation.
The front end of the main impeller 3, namely one side close to the water inlet 11, is also provided with an inducer 4, the inducer 4 can adopt an axial-flow impeller, and the blade profile of the inducer 4 has two types, namely a flat type and a bending type. The inlet and outlet of the flat blade type have the same angle, also called the equal pitch inducer. The inducer with the camber blade type is called as the inducer with the increased pitch, and the inducer with the camber blade type has a small inlet arrangement angle and a large outlet arrangement angle. The first leaf type is commonly seen in cylindrical inducers. The second leaf type is commonly seen in tapered inducer. Compared with the conical inducer, the conical inducer has higher efficiency, better cavitation resistance (being beneficial to re-condensation of bubbles due to large outlet angle and conical shape), stable operation and no noise.
The pump body 1 still is equipped with bypass runner 5 in circumference, and the one end intercommunication inducer 4's of bypass runner 5 leaf top region, the other end intercommunication pump body 1 of bypass runner 5 intake region, and then when the water pump operation for the partial rivers that flow in inducer 4 naturally flow back to the area of intaking of water pump under the pressure difference of rivers, form local water circulation.
According to the anti-cavitation water pump provided by the embodiment, the inducer 4 is arranged at the front end of the main impeller 3, and the inducer 4 applies work to fluid so as to pressurize the liquid entering the rear main impeller 3, so that the effect of improving the cavitation performance of the pump is achieved; meanwhile, the bypass flow channel 5 is arranged in the circumferential direction of the pump body 1, so that the blade top area of the inducer 4 is communicated with the water inlet area of the water pump, part of water flowing into the inducer 4 returns to the water inlet area of the pump, and local water circulation is formed. The water flow circulation is naturally driven by water flow pressure difference, is generated when the pump runs without intervention and adjustment, can obviously improve the uniformity of water flow at the inlet of the water pump and in the inducer 4, inhibits the cavitation of the water flow, reduces the cavitation allowance of the water pump, and further improves the cavitation resistance of the water pump. According to the anti-cavitation water pump, pressure difference is constructed between the inducer 4 and the water inlet 11 to naturally drive water flow circulation, the uniformity of water flow in the water inlet of the water pump and the inducer 4 is improved, and the anti-cavitation performance of the water pump can be effectively improved.
Further, as shown in fig. 1, a first annular groove 61 is circumferentially opened in a blade tip region of the pump body 1 corresponding to the inducer 4, and a second annular groove 62 is circumferentially opened in a water inlet region of the pump body 1. The bypass flow passage 5 is an annular flow passage which is circumferentially symmetrical along the circumferential direction of the pump body 1, one end of the annular flow passage is connected to the first annular groove 61, and the other end of the annular flow passage is connected to the second annular groove 62. In particular, the longitudinal section of the annular flow passage may be a horizontal C-shaped structure.
Furthermore, as shown in fig. 1, an annular member 7 enclosed by the annular flow passage and the pump body 1 is fixed to the annular flow passage by a plurality of connecting members 8 provided in the annular flow passage. Since the pump body 1 is provided with the first annular groove 61 and the second annular groove 62 at an interval, the annular member 7 is formed between the annular flow passage and the first annular groove 61 and the second annular groove 62, and the annular member 7 can be stably attached to the pump body 1 by providing the plurality of connecting members 8 in the annular flow passage.
Further, as shown in fig. 1, a plurality of connecting members 8 are provided along the circumferential direction of the annular flow passage. Specifically, the connecting members 8 may be arranged at even intervals in the circumferential direction, reducing disturbance to the backflow water flow.
Further, the bypass flow path 5 may also be a plurality of communicating pipes (not shown in the figure), one end of each communicating pipe is communicated with the blade top area of the inducer 4, and the other end of each communicating pipe is communicated with the water inlet area of the pump body 1. Specifically, the communicating tube may be a C-shaped conduit.
Further, a plurality of communication pipes are symmetrically arranged in the circumferential direction of the pump body 1. The number of the communicating pipes is at least two, and the circulating water flow can uniformly flow back through symmetrical arrangement.
On the basis of the above embodiment, the inducer 4 includes a plurality of inducer blades uniformly arranged along the circumferential direction of the pump shaft, the main impeller 3 includes a plurality of main impeller blades uniformly arranged along the circumferential direction of the pump shaft, and the inducer blades and the main impeller blades are mutually independent or integrally connected.
Further, the main impeller blades are either centrifugal blades or axial blades.
According to the embodiment, the inducer 4 is arranged at the front end of the main impeller 3, and the inducer 4 applies work to fluid so as to pressurize the liquid entering the rear main impeller 3, so that the cavitation performance of the pump is improved; meanwhile, the bypass flow channel 5 is arranged in the circumferential direction of the pump body 1, so that the blade top area of the inducer 4 is communicated with the water inlet area of the water pump, part of water flowing into the inducer 4 returns to the water inlet area of the pump, and local water circulation is formed. The water flow circulation is naturally driven by water flow pressure difference, is generated when the pump runs without intervention and adjustment, can obviously improve the uniformity of water flow at the inlet of the water pump and in the inducer 4, inhibits the cavitation of the water flow, reduces the cavitation allowance of the water pump, and further improves the cavitation resistance of the water pump. According to the anti-cavitation water pump, pressure difference is constructed between the inducer 4 and the water inlet 11 to naturally drive water flow circulation, the uniformity of water flow in the water inlet of the water pump and the inducer 4 is improved, and the anti-cavitation performance of the water pump can be effectively improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. An anti-cavitation water pump comprises a pump body, a pump shaft and a main impeller arranged on the pump shaft, wherein the pump body is provided with a water inlet and a water outlet; the pump body still is equipped with the bypass runner in circumference, the one end intercommunication of bypass runner the blade top region of inducer, the other end intercommunication of bypass runner the area of intaking of pump body.
2. The cavitation-resistant water pump according to claim 1, wherein the pump body is circumferentially provided with a first annular groove corresponding to a blade tip region of the inducer, and a water inlet region of the pump body is circumferentially provided with a second annular groove; the bypass flow channel is an annular flow channel, one end of the annular flow channel is connected to the first annular groove, and the other end of the annular flow channel is connected to the second annular groove.
3. The anti-cavitation water pump according to claim 2, wherein the annular flow passage and the annular member surrounded by the pump body are fixedly connected to the annular flow passage by a plurality of connecting members provided in the annular flow passage.
4. The cavitation-resistant water pump of claim 3, wherein a plurality of the connection members are arranged along a circumferential direction of the annular flow passage.
5. The anti-cavitation water pump according to claim 1, wherein the bypass flow passage is a plurality of communicating pipes, one end of each communicating pipe is communicated with a blade top area of the inducer, and the other end of each communicating pipe is communicated with a water inlet area of the pump body.
6. The cavitation-resistant water pump of claim 5, wherein a plurality of the communication pipes are symmetrically arranged along a circumferential direction of the pump body.
7. The anti-cavitation water pump according to any one of claims 1 to 6, wherein the inducer includes a plurality of inducer blades that are uniformly arranged in a circumferential direction of the pump shaft, the main impeller includes a plurality of main impeller blades that are uniformly arranged in the circumferential direction of the pump shaft, and the inducer blades and the main impeller blades are independently or integrally connected to each other.
8. The cavitation-resistant water pump of claim 7, wherein the main impeller blades are centrifugal blades or axial flow blades.
CN202011105171.2A 2020-10-15 2020-10-15 Anti-cavitation water pump Pending CN112196827A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011105171.2A CN112196827A (en) 2020-10-15 2020-10-15 Anti-cavitation water pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011105171.2A CN112196827A (en) 2020-10-15 2020-10-15 Anti-cavitation water pump

Publications (1)

Publication Number Publication Date
CN112196827A true CN112196827A (en) 2021-01-08

Family

ID=74010503

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011105171.2A Pending CN112196827A (en) 2020-10-15 2020-10-15 Anti-cavitation water pump

Country Status (1)

Country Link
CN (1) CN112196827A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113915172A (en) * 2021-11-10 2022-01-11 天津理工大学 Anti-cavitation self-circulation casing of axial-flow water pump and working method thereof
CN114033701A (en) * 2021-12-13 2022-02-11 浙江理工大学 Centrifugal pump structure with high cavitation resistance and low amplitude vibration

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113915172A (en) * 2021-11-10 2022-01-11 天津理工大学 Anti-cavitation self-circulation casing of axial-flow water pump and working method thereof
CN114033701A (en) * 2021-12-13 2022-02-11 浙江理工大学 Centrifugal pump structure with high cavitation resistance and low amplitude vibration

Similar Documents

Publication Publication Date Title
CN112196827A (en) Anti-cavitation water pump
CN101004175A (en) Double suction microminiature type vane pump with no spindle drive
WO2017126581A1 (en) Piping for driven-type fluid machine
CN108869397B (en) Volute for centrifugal pump and centrifugal pump
CN109630472B (en) Centrifugal pump for inhibiting cavitation surge
CN104100537A (en) LNG (liquefied natural gas) immersed centrifugal pump
CN213511342U (en) Anti-cavitation water pump
CN110500288A (en) A kind of MODEL VERTICAL MULTISTAGE PUMP space guide vane body
CN106762854A (en) A kind of anti-cavitation double feed inlet double-suction multi-stage pump
CN105626575A (en) Multi-level blade centrifugal wheel
CN105782121A (en) Axial flow pump
CN211975415U (en) High-efficient centrifugal water pump
KR102077627B1 (en) High head submersible pump
CN207647843U (en) Energy-efficient high cavitation performance double entry pump
CN216894919U (en) First-stage double-suction impeller structure for multi-stage pump
CN101122295A (en) Low reaction degree compressor
RU2361117C1 (en) Multistage centrifugal pump
CN110630507A (en) Double-suction type full-symmetry multistage pump
CN221257148U (en) Water pump
CN221423537U (en) Centrifugal pump impeller and centrifugal pump
CN204003508U (en) A kind of LNG latent liquid type centrifugal pump
CN212055134U (en) High cavitation performance mixed type multistage centrifugal pump
CN213116712U (en) Anti-cavitation vertical multistage centrifugal pump
CN212479696U (en) High-efficiency energy-saving multistage middle-open double-suction pump
CN215805239U (en) Flow guide rotating shaft of series type canned motor pump

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination