CN212202594U - Axial force balance structure of marine seawater lift pump - Google Patents
Axial force balance structure of marine seawater lift pump Download PDFInfo
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- CN212202594U CN212202594U CN201921777118.XU CN201921777118U CN212202594U CN 212202594 U CN212202594 U CN 212202594U CN 201921777118 U CN201921777118 U CN 201921777118U CN 212202594 U CN212202594 U CN 212202594U
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- impeller
- pump
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- cavity
- sealing ring
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Abstract
The utility model discloses an axial force balance structure of marine seawater lift pump, which is characterized in that the axial force balance structure comprises two sealing rings respectively arranged on the front cover plate and the rear cover plate of an impeller and a plurality of balance holes arranged on the rear cover plate close to the impeller hub, wherein the cavity B of the rear pump cavity is communicated with the impeller suction inlet or the suction chamber of the pump through the clearance of the sealing rings, and the balance holes are used for communicating the cavity A of the impeller suction inlet and the cavity B of the rear pump cavity; and a sealing ring gap is formed between the rear sealing ring and the impeller rear cover plate, and the sealing ring gap enables the cavity B of the rear pump cavity to be communicated with an impeller suction inlet or a suction chamber of the pump. The utility model discloses a quantity and the three technical parameter in aperture size of the quantity of the diameter at rational design sealing ring place, sealing ring clearance, balance hole come effectual balanced axial force.
Description
Technical Field
The utility model relates to a marine sea water elevator pump technical field, in particular to marine sea water elevator pump's axial force balanced structure.
Background
In the application of the marine pump, the marine seawater lift pump which is easy to operate and convenient to use is the preferred requirement of customers due to the limitation of sites.
Marine lift pumps are centrifugal pumps in which if one does not try to eliminate or balance the axial force on the impeller (transmitted to the shaft), the axial force will pull the rotor axially into play, contacting stationary parts, causing damage to the pump parts. At present, two methods are used for balancing axial force in a marine seawater lifting pump: one is to design the balance hole, the other is the balance pipe, the axial force can be well balanced, and meanwhile, the characteristics of easy maintenance and improvement of the reliability and safety of the equipment operation can be met. However, the balance method has large leakage amount and little effect of balancing the axial force.
Disclosure of Invention
The utility model aims to solve the technical problem that the weak point that exists to the method of balanced axial force in current marine seawater elevator pump lies in providing the axial force balanced structure of marine seawater elevator pump.
In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:
an axial force balance structure of a marine seawater lift pump comprises two sealing rings respectively arranged on a front cover plate and a rear cover plate of an impeller and a plurality of balance holes arranged on the rear cover plate close to a hub of the impeller, wherein a cavity B of a rear pump cavity is communicated with an impeller suction inlet or a suction chamber of the pump through the gap of the sealing rings, and the balance holes are used for communicating a cavity A of the impeller suction inlet with a cavity B of the rear pump cavity; and a sealing ring gap is formed between the sealing ring on the rear cover plate of the impeller hub and the rear cover plate of the impeller hub, and the sealing ring gap enables the cavity B of the rear pump cavity to be communicated with an impeller suction inlet or a suction chamber of the pump.
In a preferred embodiment of the present invention, the diameter of the front sealing ring is different from the diameter of the rear sealing ring.
In a preferred embodiment of the present invention, the diameter of the rear sealing ring is larger than the diameter of the front sealing ring.
In a preferred embodiment of the present invention, the balance hole is provided on the back cover plate near the impeller hub to communicate the a cavity of the impeller suction inlet and the B cavity of the back pump cavity.
In a preferred embodiment of the present invention, the total area of the radial section of the balance aperture should not be less than 5 to 8 times the area of the sealing ring section.
In a preferred embodiment of the invention, the diameter of the balancing hole is inversely proportional to the axial force balanced out.
Owing to adopted above technical scheme, the utility model discloses a quantity and the three technical parameter in aperture size of the diameter at rational design sealing ring place, sealing ring clearance, balanced hole come effectual balanced axial force.
Drawings
Fig. 1 is a schematic diagram of the axial force balance structure of the marine seawater lift pump of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings and the detailed description. The following embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific design processes are given, but the scope of the present invention is not limited to the following embodiments.
For the marine seawater lift pump with small axial force, the requirement of convenient daily maintenance is met, the system is simple, the thrust bearing is not designed to bear the axial force, and the sealing ring, the balance hole and the sealing gap are designed to be matched with each other to reasonably balance the axial force.
As shown in fig. 1, a seal ring 11 is additionally provided to a rear cover plate 12a of an impeller 12, and a seal ring 11a is also provided to a front cover plate 12B of the impeller 12, and a diameter C of the seal ring 11 is larger than a diameter D of the seal ring 11a, and a seal ring gap E is provided between the seal ring 11 and the rear cover plate 12a of the impeller, and the seal ring gap E allows a cavity B of a rear pump cavity to communicate with an impeller suction port or a pump suction chamber. In addition, a balance hole 13 for communicating the chamber a of the impeller suction port and the chamber B of the rear pump chamber is opened in the rear cover plate 12a of the impeller 12. Due to the loss of resistance to the liquid flowing through the seal ring gap E, the pressure of the liquid at the lower portion of the seal ring 11 is lowered, thereby reducing the axial force acting on the back cover plate 12 a.
The sealing ring clearance E between the sealing ring 11 and the back cover plate 12a of the impeller is generally in the range of 0.2-0.3 mm, and the relationship between the aperture size and the number of the balance holes 13 and the sealing ring clearance E is that the total area of the radial sections of the balance holes 13 is not less than 5-8 times of the area of the sections of the sealing ring clearance E.
The aperture of the balance hole 13 is inversely proportional to the balanced axial force, generally about 97% of the balanced axial force is theoretically needed, and the rest of the axial force needs to be balanced by a bearing of the motor.
Claims (6)
1. An axial force balance structure of a marine seawater lift pump is characterized by comprising two sealing rings which are respectively arranged on a front cover plate and a rear cover plate of an impeller and a plurality of balance holes which are arranged on the rear cover plate close to a hub of the impeller, wherein a cavity B of a rear pump cavity is communicated with an impeller suction inlet or a suction chamber of the pump through the gap of the sealing rings, and the balance holes are used for communicating a cavity A of the impeller suction inlet with a cavity B of the rear pump cavity; and a sealing ring gap is formed between the sealing ring on the rear cover plate of the impeller and the rear cover plate of the impeller, and the sealing ring gap enables the cavity B of the rear pump cavity to be communicated with an impeller suction inlet or a suction chamber of the pump.
2. The axial force balancing structure of a marine lift pump, according to claim 1, wherein the sealing ring of the front cover plate has a diameter different from a diameter of the sealing ring of the rear cover plate.
3. The axial force balancing structure of a marine lift pump, according to claim 2, wherein the diameter of the sealing ring of the rear cover plate is larger than the diameter of the sealing ring of the front cover plate.
4. The axial force balancing structure of a marine seawater elevator pump of claim 3, wherein the balancing hole is provided on the back cover plate near the impeller hub to communicate the chamber a of the impeller suction inlet and the chamber B of the back pump chamber.
5. The axial force balance structure of marine seawater lift pump of claim 4, wherein the total area of the radial cross section of the balance aperture is not less than 5 to 8 times the cross section area of the sealing ring.
6. The axial force balancing structure of a marine lift pump, according to claim 5, wherein the diameter of the balancing hole is inversely proportional to the balanced axial force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921777118.XU CN212202594U (en) | 2019-10-22 | 2019-10-22 | Axial force balance structure of marine seawater lift pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921777118.XU CN212202594U (en) | 2019-10-22 | 2019-10-22 | Axial force balance structure of marine seawater lift pump |
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| Publication Number | Publication Date |
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| CN212202594U true CN212202594U (en) | 2020-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921777118.XU Active CN212202594U (en) | 2019-10-22 | 2019-10-22 | Axial force balance structure of marine seawater lift pump |
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| CN (1) | CN212202594U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110701099A (en) * | 2019-10-22 | 2020-01-17 | 中国电建集团上海能源装备有限公司 | Marine seawater lifting pump axial force balancing method and balancing structure |
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2019
- 2019-10-22 CN CN201921777118.XU patent/CN212202594U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110701099A (en) * | 2019-10-22 | 2020-01-17 | 中国电建集团上海能源装备有限公司 | Marine seawater lifting pump axial force balancing method and balancing structure |
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