CN2499612Y - Anti-cavitation device for centrifugal pump - Google Patents
Anti-cavitation device for centrifugal pump Download PDFInfo
- Publication number
- CN2499612Y CN2499612Y CN 01267811 CN01267811U CN2499612Y CN 2499612 Y CN2499612 Y CN 2499612Y CN 01267811 CN01267811 CN 01267811 CN 01267811 U CN01267811 U CN 01267811U CN 2499612 Y CN2499612 Y CN 2499612Y
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- CN
- China
- Prior art keywords
- centrifugal pump
- branch pipe
- outlet chamber
- cavitation
- pump
- 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.)
- Expired - Lifetime
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Abstract
The utility model relates to an anti-cavitation device for centrifugal pump, which comprises a taper shaped outlet chamber arranged on a water inlet of a centrifugal pump, a tee arranged on an outlet of the centrifugal pump, a adjusting valve connected with one outlet of the tee, a circulating branch pipe connected with the adjusting valve and stretching to the taper shaped inlet chamber by one end of the circulating branch pipe, a contracting nozzle arranged on the other end of the circulating branch pipe. The utility model has wider application range and can be used in a low-positioned deaerator and can reduce operating height from 7-8 meters, even tens meters position formerly to the ground, which can solve the problem of cavitation effectively, and can be used to supply water to any closed container, with improved reliability of operation, a simplified structure, reduced cost, saved room, and convenient maintenance.
Description
Technical field
The utility model relates to a kind of centrifugal pump, specifically, relates to a kind of device that prevents cavitation in centrifugal pump.
Background technique
Ordinary Centrifugal Pumps requires to have bigger pressure head in the pump impeller ingress, because if behind the water inflow pump, drop at certain position pressure of impeller and to be lower than water saturation pressure, will partial vaporization take place in the locality, can cause the cavitation phenomenon of pump when serious, pump performance is obviously reduced, and system can't proper functioning.For avoiding this phenomenon to take place, must guarantee the available net positive suction head that pump can use net positive suction head to require greater than water pump structure itself in the pump intake prerequisite for enough available net positive suction heads.
The net positive suction head that pump can be used is calculated by following formula:
NPSH (can)=(Pb-Ps)+Hz-Hf
Wherein, Pb is system pressure (absolute pressure)
Hz is that liquid level is to the positive pressure head between the water pump spindle
Ps is the pressure of saturation temperature under the operational condition
Hf is the line loss pressure head of inlet
As can be seen, on principle, can adopt following measure for increasing available net positive suction head:
1, improves system pressure Pb, promptly install the high-pressure water jet water diversion apparatus additional;
2, improve liquid level to the positive pressure head Hz between the water pump spindle, promptly improve the mounting point of setting etc.;
3, reduce line loss pressure head Hf, promptly strengthen caliber, reduce length of pipeline, lower flow velocity etc.
The way of common engineering is to improve the mounting point that is provided with, for example, and the elevated tank of thermal deaerator.This way is brought many problems to apparatus structure and fabricating yard.
The height of the elevated tank of oxygen-eliminating device such as following table:
| Water temperature ℃ | 100 | 105 | 110 | 120 |
| Water tank height (rice) | 6 | 8 | 11 | 17.5 |
At present for the atmosphere environmental protection requirement carrying out boiler oil with oil, rock gas is for the coal engineering, the boiler volume height reduces significantly, if be equipped with 7,8 meters even tens meters high water tanks again, in the place, outward appearance, cost aspects be all very unbecoming.The not long ago domestic product of releasing low level, heating power deaerator, but on working principle, do not deal with problems, actual effect is also undesirable, fails thoroughly to solve the cavitation erosion problem. at allCarry the cavitation erosion problem that occurs water transport pump under the water of closed containers and the liquid situation at some, as water of condensation enclosed recovering device.
The model utility content
The purpose of this utility model provides a kind of device that prevents cavitation in centrifugal pump.
The device that prevents cavitation in centrifugal pump described in the utility model, comprise the conical outlet chamber that is arranged on the centrifugal pump water intake, be arranged on the threeway of centrifugal pump outlet, a modulating valve that outlet is connected with threeway, be connected with modulating valve, and the loop branch pipe that leads to the conical outlet chamber, have convergent nozzle in the end of loop branch pipe.
Have flow distribution plate above described conical outlet chamber, this flow distribution plate is the rib of criss-crossing, and the center has through hole, and its outer end is connected with the awl tube, and the convergent nozzle of described loop branch pipe inserts the center hole of flow distribution plate.
Described conical outlet chamber is one and is inverted the awl tube.
The utility model is compared with aforementioned three kinds of methods, and the utility model adopts the device that prevents cavitation in centrifugal pump of jet diversion principle design to have following advantage as can be seen:
1, application area is widely arranged, can be used for the low level oxygen-eliminating device, can be reduced to the position, level land originally installing 7,8 meters even tens meters high positions;
2, solved the cavitation erosion problem effectively,,, can eliminate cavitation erosion effectively, improved the operational reliability that is provided with as the enclosed recovering device of high-temperature water and condensed fluid no matter which kind of closed container water delivery all can be used;
3, simple in structure, cost is low, take up an area of little, easy to maintenance, in the place, outward appearance cost aspects is all very profitable,
Description of drawings
Fig. 1 is that the device of cavitation in centrifugal pump that prevents described in the utility model is connected the schematic representation of condensed fluid enclosed recovering device;
Fig. 2 is that the A of Fig. 1 is to view.
Embodiment
Referring to Fig. 1 and Fig. 2, the device that prevents cavitation in centrifugal pump described in the utility model, comprise the conical outlet chamber 2 that is arranged on the centrifugal pump water intake, be arranged on the threeway 4 of centrifugal pump 3 outlets, a modulating valve 5 that outlet is connected with threeway 4, loop branch pipe 6 with modulating valve 5 is connected and leads to conical outlet chamber 2 has a convergent nozzle 7 in the end of loop branch pipe.Described conical outlet chamber 2 is arranged on the below of pressurized container 1, and liquid can be flowed out smoothly, and can make the jet diversion be mixed into water pump.5 flows of regulating circulation branch road liquid of modulating valve are promptly regulated the effect of the flow velocity of convergent nozzle 7.Described convergent nozzle 7 sprays at a high speed after making liquid contraction.
Have flow distribution plate 8 above described conical outlet chamber 2, this flow distribution plate 8 can avoid liquid to produce whirlpool.Described flow distribution plate 8 is the rib of criss-crossing, and the center has through hole, and its outer end is connected with conical outlet chamber 2, and the convergent nozzle 7 of described loop branch pipe 6 inserts the center hole of flow distribution plate.
Described conical outlet chamber 2 is one and is inverted the awl tube.
It is that pump installs the high-pressure water jet water diversion apparatus additional and improves system pressure that the utility model is based on jet current principle, and liquid just enters pump through very short conical outlet and has reduced line loss, the whirlpool that produces when cross flow distribution plate can be avoided the variable working condition low water level is housed in the conical outlet chamber and forms the distortion of pump inlet velocity flow profile, can not cause the local depression district.This three measures has all played the inhibition pump cavitation effect under the low entrance head condition, so just can effectively solve the pump cavitation problem.
The working procedure that prevents the device of cavitation in centrifugal pump described in the utility model: the liquid that is transferred enters centrifugal pump by conical outlet chamber 2, pump becomes high-head liquid with the liquid of low-head and sends, the high-pressure water head of pump discharge is told a loop branch pipe 6 by threeway, close the ejaculation high-velocity flow through modulating valve 5 convergent nozzle of flowing through, mix in conical outlet chamber 2 with the main flow that is transferred, mixed current have improved static pressure head, have promptly amplified system pressure; Meanwhile, the whirlpool that produces when cross flow distribution plate can be avoided the variable working condition low water level is installed in conical outlet chamber 2 and forms the distortion of pump inlet velocity flow profile, can not cause the local depression district; In addition, flow of liquid has just entered centrifugal pump through very short conical outlet, has reduced line loss effectively.This three measures all plays the inhibition pump cavitation effect under the low entrance head condition.
Claims (3)
1, a kind of device that prevents cavitation in centrifugal pump, it is characterized in that comprising the conical outlet chamber (2) that is arranged on the centrifugal pump water intake, be arranged on the threeway (4) of centrifugal pump (3) outlet, a modulating valve (5) that outlet is connected with threeway (4), loop branch pipe (6) with modulating valve (5) is connected and leads to conical outlet chamber (2) has convergent nozzle (7) in the end of loop branch pipe.
2, the device that prevents cavitation in centrifugal pump according to claim 1, it is characterized in that having flow distribution plate (8) in the top in described conical outlet chamber (2), this flow distribution plate (8) is the rib of criss-crossing, the center has through hole, its outer end is connected with conical outlet chamber (2), and the convergent nozzle (7) of described loop branch pipe (6) inserts the center hole of flow distribution plate.
3, the device that prevents cavitation in centrifugal pump according to claim 1 and 2 is characterized in that described conical outlet chamber (2) is one and is inverted the awl tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01267811 CN2499612Y (en) | 2001-10-19 | 2001-10-19 | Anti-cavitation device for centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01267811 CN2499612Y (en) | 2001-10-19 | 2001-10-19 | Anti-cavitation device for centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2499612Y true CN2499612Y (en) | 2002-07-10 |
Family
ID=33674120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01267811 Expired - Lifetime CN2499612Y (en) | 2001-10-19 | 2001-10-19 | Anti-cavitation device for centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2499612Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968064A (en) * | 2010-11-17 | 2011-02-09 | 重庆大学 | Anti-cavitation centrifugal pump |
| CN102207091A (en) * | 2011-06-07 | 2011-10-05 | 张意立 | High-concentration centrifugal pulp pump capable of spraying water on inner and outer corners |
| CN102635555A (en) * | 2011-02-14 | 2012-08-15 | 张意立 | High-concentration centrifugal pulp pump capable of spraying water at inner corner |
| CN103185369A (en) * | 2012-08-20 | 2013-07-03 | 哈尔滨工大金涛科技股份有限公司 | Directly heating machine |
| CN105090044A (en) * | 2014-11-21 | 2015-11-25 | 衢州学院 | Centrifugal pump |
| CN105090045A (en) * | 2014-12-02 | 2015-11-25 | 芜湖三峰节能设备有限公司 | Centrifugal pump with industrial mechanical seal |
| CN105781955A (en) * | 2016-05-23 | 2016-07-20 | 肥西县鑫山机械厂 | Centrifugal pump with industrial mechanical seal |
| CN110985449A (en) * | 2019-12-04 | 2020-04-10 | 武汉理工大学 | Large-scale mail steamer water supply system and centrifugal pump cavitation erosion prevention device |
| CN113376053A (en) * | 2021-06-11 | 2021-09-10 | 中山大学 | Material surface scaling behavior simulation online monitoring test system and test method |
| US11965513B2 (en) | 2021-09-14 | 2024-04-23 | Saudi Arabian Oil Company | Protecting centrifugal pumps from cavitation through applied mathematical technique |
-
2001
- 2001-10-19 CN CN 01267811 patent/CN2499612Y/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968064A (en) * | 2010-11-17 | 2011-02-09 | 重庆大学 | Anti-cavitation centrifugal pump |
| CN102635555A (en) * | 2011-02-14 | 2012-08-15 | 张意立 | High-concentration centrifugal pulp pump capable of spraying water at inner corner |
| CN102635555B (en) * | 2011-02-14 | 2014-11-12 | 广东凌霄泵业股份有限公司 | High-concentration centrifugal pulp pump capable of spraying water at inner corner |
| CN102207091A (en) * | 2011-06-07 | 2011-10-05 | 张意立 | High-concentration centrifugal pulp pump capable of spraying water on inner and outer corners |
| CN102207091B (en) * | 2011-06-07 | 2012-12-12 | 张意立 | High-concentration centrifugal pulp pump capable of spraying water on inner and outer corners |
| CN103185369A (en) * | 2012-08-20 | 2013-07-03 | 哈尔滨工大金涛科技股份有限公司 | Directly heating machine |
| CN105090044A (en) * | 2014-11-21 | 2015-11-25 | 衢州学院 | Centrifugal pump |
| CN105090044B (en) * | 2014-11-21 | 2017-07-14 | 衢州学院 | Centrifugal pump |
| CN105090045A (en) * | 2014-12-02 | 2015-11-25 | 芜湖三峰节能设备有限公司 | Centrifugal pump with industrial mechanical seal |
| CN105781955A (en) * | 2016-05-23 | 2016-07-20 | 肥西县鑫山机械厂 | Centrifugal pump with industrial mechanical seal |
| CN110985449A (en) * | 2019-12-04 | 2020-04-10 | 武汉理工大学 | Large-scale mail steamer water supply system and centrifugal pump cavitation erosion prevention device |
| CN113376053A (en) * | 2021-06-11 | 2021-09-10 | 中山大学 | Material surface scaling behavior simulation online monitoring test system and test method |
| CN113376053B (en) * | 2021-06-11 | 2023-02-17 | 中山大学 | Material surface scaling behavior simulation online monitoring test system and test method |
| US11965513B2 (en) | 2021-09-14 | 2024-04-23 | Saudi Arabian Oil Company | Protecting centrifugal pumps from cavitation through applied mathematical technique |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: XU HONGMEI; XU YI Free format text: FORMER NAME OR ADDRESS: BEIJING ZHONGTOU JIETIAN ENERGY SAVING AND ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Patentee after: Xu Hongmei Patentee after: Xu Yi Patentee before: Zhongtoujietian Energy Saving Environment Protection Science and Technology Co., |
|
| C56 | Change in the name or address of the patentee |
Owner name: ZHONGTOU JIETIAN INDUSTRIAL DEVELOPMENT CO., LTD. Free format text: FORMER NAME OR ADDRESS: XU HONGMEI; XU YI |
|
| CP01 | Change in the name or title of a patent holder |
Patentee after: Zhongtoujietian Industrial Development Co., Ltd. Patentee before: Xu Hongmei Patentee before: Xu Yi |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20111019 Granted publication date: 20020710 |