CN213511342U - Anti-cavitation water pump - Google Patents
Anti-cavitation water pump Download PDFInfo
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- CN213511342U CN213511342U CN202022299575.1U CN202022299575U CN213511342U CN 213511342 U CN213511342 U CN 213511342U CN 202022299575 U CN202022299575 U CN 202022299575U CN 213511342 U CN213511342 U CN 213511342U
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Abstract
The embodiment of the utility model provides an anti-cavitation water pump, which 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, and the anti-cavitation water pump also comprises an inducer arranged on the pump shaft, and the inducer is arranged on one side of the main impeller facing the water inlet; 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
Technical Field
The utility model relates to a water pump technical field especially relates 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.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an anti cavitation water pump for solve the water pump among the prior art and easily take place the problem of cavitation, improve the anti cavitation performance of pump.
The embodiment of the utility model provides an anti-cavitation water pump, which 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, and the anti-cavitation water pump also comprises an inducer arranged on the pump shaft, and the inducer is arranged on one side of the main impeller facing the water inlet; 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 provided by the embodiment of the utility model, the pump body is circumferentially provided with a first annular groove corresponding to the blade top region of the inducer, and the 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.
According to the utility model discloses an anti cavitation water pump, the annular runner with the annular part that the pump body encloses and establishes into is located through a plurality of connecting piece rigid coupling in the annular runner.
According to the utility model discloses an anti cavitation water pump, it is a plurality of the connecting piece is followed annular flow channel's circumference sets up.
According to the utility model discloses an anti cavitation water pump, the bypass runner is a plurality of communicating pipes, the one end intercommunication of communicating pipe the blade top region of inducer, the other end intercommunication of communicating pipe the area of intaking of the pump body.
According to the utility model discloses an anti cavitation water pump, it is a plurality of the intercommunication pipe is followed the circumference symmetry of the pump body sets up.
According to the utility model discloses an anti cavitation water pump, the inducer includes a plurality of edges the inducer blade that the circumference of pump shaft evenly set up, the main impeller includes a plurality of edges the main impeller blade that the circumference of pump shaft evenly set up, the inducer blade with main impeller blade mutual independence or integration are connected.
According to the utility model discloses anti cavitation water pump of an embodiment, the main impeller blade is centrifugal blade or axial-flow type blade.
The embodiment of the utility model provides an anti-cavitation water pump, through install the inducer at the front end of main impeller, do work through the inducer convection cell to the liquid that gets into the main impeller in the back plays the pressure boost effect, thereby reaches the effect that improves the cavitation performance of pump; 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 needed to be 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 for those skilled in the art, other drawings can be obtained according to these 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 embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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 clearly indicating the numbering of the product parts 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. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled 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. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.
As shown in fig. 1, the embodiment of the utility model provides a pair of anti-cavitation water pump, including the pump body 1, pump shaft 2 and install in the main impeller 3 of pump shaft 2, water inlet 11 and delivery port 12 have been seted up to the pump body 1, still including installing in the inducer 4 of pump shaft 2, one side of main impeller 3 towards water inlet 11 is located to inducer 4. 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.
As can be seen from the above embodiments, the anti-cavitation water pump provided by the utility model has the advantages that the inducer 4 is installed at the front end of the main impeller 3, and the inducer 4 applies work to the fluid to pressurize the liquid entering the rear main impeller 3, so as to achieve the effect of improving the cavitation performance of the pump; 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 embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022299575.1U CN213511342U (en) | 2020-10-15 | 2020-10-15 | Anti-cavitation water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022299575.1U CN213511342U (en) | 2020-10-15 | 2020-10-15 | Anti-cavitation water pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213511342U true CN213511342U (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022299575.1U Active CN213511342U (en) | 2020-10-15 | 2020-10-15 | Anti-cavitation water pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213511342U (en) |
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2020
- 2020-10-15 CN CN202022299575.1U patent/CN213511342U/en active Active
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