CN115306758A - Self-adaptive balancing device for spindle nose force - Google Patents
Self-adaptive balancing device for spindle nose force Download PDFInfo
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- CN115306758A CN115306758A CN202210846125.0A CN202210846125A CN115306758A CN 115306758 A CN115306758 A CN 115306758A CN 202210846125 A CN202210846125 A CN 202210846125A CN 115306758 A CN115306758 A CN 115306758A
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- Prior art keywords
- pump
- self
- adaptive
- cavity
- shaft
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Classifications
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- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/041—Axial thrust balancing
- F04D29/0416—Axial thrust balancing balancing pistons
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention relates to a shaft head force self-adaptive balancing device which comprises a balancing component and a self-adaptive pressure supply device, wherein the balancing component is arranged in a pump cavity between a pump shaft and a pump shell, a balancing cavity in the balancing component is connected with a small piston cylinder of the self-adaptive pressure supply device, a large piston cylinder of the self-adaptive pressure supply device is connected with the pump cavity, the self-adaptive pressure supply device is used for self-adaptively balancing the force generated by the pressure intensity of hydraulic oil in the balancing component and balancing the shaft head force generated by the high-pressure action of an inlet of a centrifugal pump. The invention can self-adaptively balance the shaft head force generated under any inlet pressure, greatly improve the bearing stress state, reduce the vibration noise of the centrifugal pump operation, improve the stability and the reliability of the centrifugal pump operation, and avoid the double functions of high pressure of mechanical seal and impurity particles.
Description
Technical Field
The invention relates to a shaft head force balancing technology of an inlet high-pressure centrifugal pump, in particular to a centrifugal pump or a circulating centrifugal pump applied to the flow of inlet high pressure, and particularly relates to a self-adaptive shaft head force balancing structure under the condition that the pump shaft end of the centrifugal pump is immersed in a medium.
Background
The centrifugal pump adopts an impeller cantilever structure, and the shaft end of the centrifugal pump is directly immersed in a medium. Because of the action of high pressure medium at the inlet of the centrifugal pump, a large upward shaft head force can be generated, and the shaft head force cannot be balanced by the self structure of the centrifugal pump. At present, the problem of shaft head force balance is solved by generally adopting a bearing structure capable of bearing large axial thrust. The limitations of this structure are reflected in the following aspects:
only larger bearings can be selected, so that the space size is increased, and the vibration noise of the bearings is larger, which is not beneficial to the operation with reduced volume and low noise; the centrifugal pump shaft is integrally pressed to generate larger bending deflection, so that the running stability of the centrifugal pump is poor; because of the structural space limitation, a larger-size bearing cannot be selected, the bearing is subjected to larger axial thrust, the maintenance time is shortened, the service life of the bearing is shortened, and the reliability of the centrifugal pump is adversely affected; the mechanical seal for the pump needs to simultaneously bear the double functions of high pressure and granular impurities in the medium or medium crystal particles, and is easy to damage. Therefore, no suitable structure and method for balancing the shaft head force exists at present.
Disclosure of Invention
The invention provides a shaft head force self-adaptive balancing device which can self-adaptively balance shaft head force generated under any inlet pressure, greatly improve the bearing stress state, reduce vibration noise of centrifugal pump operation, improve the stability and reliability of centrifugal pump operation, and avoid double effects of high pressure of mechanical seal and impurity particles.
The technical scheme of the invention is as follows: the self-adaptive balancing device for the shaft head force comprises a balancing component and a self-adaptive pressure supply device, wherein the balancing component is arranged in a pump cavity between a pump shaft and a pump shell, a balancing cavity in the balancing component is connected with a small piston cylinder of the self-adaptive pressure supply device, a large piston cylinder of the self-adaptive pressure supply device is connected with the pump cavity, the self-adaptive pressure supply device is used for self-adaptively balancing the force generated by the pressure intensity of hydraulic oil in the balancing component and balancing the shaft head force generated by the high-pressure action of an inlet of the centrifugal pump.
Further, the shaft sleeve and the friction ring assembly in the balance assembly jointly form a seal between the pump shell and the pump shaft, and an O-shaped ring is adopted between the shaft sleeve and the pump shaft to prevent fluid in the pump cavity from leaking through a gap between the shaft sleeve and the pump shaft.
Further, an inner friction ring in the balance assembly is arranged between the pump cavity and the balance cavity, contacts impurity particles but is not subjected to high pressure, and prevents fluid in the pump cavity from leaking into the balance cavity;
furthermore, the outer friction ring is arranged between the balance cavity and the external environment, bears high pressure and does not contact with impurity particles, and hydraulic oil in the balance cavity is prevented from leaking.
Furthermore, a large piston in a cylinder body of the self-adaptive pressure supply device is connected with a small piston through a connecting rod, a piston cylinder of the large piston is connected with a pump cavity, a piston cylinder of the small piston is connected with a balance cavity, and high-pressure medium at an inlet of the pump and hydraulic oil in the balance cavity are conveyed through a pipe fitting.
Further, when the inlet of the pump is high-pressure, the self-adaptive pressure supply device enables the shaft head force to be balanced with the acting force in the balance cavity by controlling the area ratio of the large piston and the small piston in the piston cylinder and the size of the shaft sleeve, so that the self-adaptive adjustment of the shaft head force of the pump in the pressure change process can be realized.
Further, the adaptive pressure supply device is arranged at one side of the pump.
The invention has the beneficial effects that:
the invention can self-adaptively balance the shaft head force generated by the centrifugal pump under any inlet pressure, greatly improve the bearing stress state, effectively reduce the vibration noise of the operation of the centrifugal pump, improve the stability and the reliability of the operation of the centrifugal pump and avoid the double functions of high pressure of mechanical seal and impurity particles.
Drawings
FIG. 1 is a schematic view of the installation of the self-adaptive spindle nose force balancing apparatus of the present invention;
FIG. 2 is a piston cylinder force diagram of the adaptive pressure supply apparatus of the present invention;
FIG. 3 is a diagram of a balancing assembly of the present invention;
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in FIG. 1, the self-adaptive spindle nose force balancing device of the present invention comprises a self-adaptive pressure supply device 100 and a balancing assembly 200. The balance assembly 200 is composed of a shaft sleeve 1, a gland 2, an outer friction ring 3, an inner friction ring 4, an O-shaped ring 5 and the like. The shaft sleeve 1 and the pump shaft 11 are sealed by an O-shaped ring 5, so that the fluid in the pump cavity 12 is prevented from leaking through a gap between the shaft sleeve and the pump shaft. A friction ring assembly consisting of an outer friction ring 3 and an inner friction ring 4 between the shaft sleeve 1 and the gland 2 jointly forms a seal between the pump shell 10 and the shaft sleeve 1 and forms a balance cavity 13, and an impeller 14 is arranged in the pump cavity 12. The inner friction ring 4 is arranged between the pump chamber 12 and the balance chamber 13, contacts foreign particles but is not subjected to high pressure, and prevents fluid leakage of the pump chamber 12 into the balance chamber 13; the outer friction ring 3 is arranged between the balance cavity 13 and the external environment, bears high pressure without contacting with impurity particles, and prevents hydraulic oil in the balance cavity from leaking. The adaptive pressure supply device 100 is composed of a cylinder 6 and a large piston 71 and a small piston 73 connected to a connecting rod 72. The large piston 71 in the cylinder 6 is connected with the small piston 73 through the connecting rod 72, the hydraulic cylinder of the small piston 73 and the balance cavity 13 are filled with hydraulic oil, and the hydraulic cylinder of the large piston 71 and the pump cavity 12 are filled with the delivered medium. The hydraulic cylinder of the small piston 73 of the self-adaptive pressure supply device is connected with the balance cavity, the hydraulic cylinder of the large piston 71 is connected with the inlet of the pump, high-pressure medium at the inlet of the pump and hydraulic oil in the balance cavity are conveyed through a pipe fitting and are arranged on the side surface of the pump; when the pump inlet is under high pressure, the shaft head force and the acting force in the balance cavity are balanced by controlling the area ratio of the two pistons in the self-adaptive pressure supply device and the size of the shaft sleeve, so that the self-adaptive adjustment of the shaft head force of the pump in the pressure change process is realized.
As shown in fig. 2, the force analysis in the adaptive pressure supply device:
at high pump inlet pressure, the large piston 71 on the adaptive balancing device will generate thrust F 1 At this time, the thrust force F generated in the small piston 73 2 ＝F 1 。
Pressure in the small piston cylinder:
P 2 ＝S 1 /S 2 ×P 1
P 1 pressure at the inlet of the centrifugal pump, P 2 Pressure intensity in the small piston cylinder; s 1 Large piston area, S 2 Small piston area.
The area ratio of the large piston 71 to the small piston 73 is controlled so that P is 2 ＞P 1 . Pump inlet pressure P 1 At increasing time, P 2 And also increases. Due to fixed piston area ratio, i.e. P 2 /P 1 Is constant C, so that the pressure in the balance chamber can be adjusted adaptively during the change of the pump inlet pressure.
As shown in fig. 3, the force analysis within the balance assembly:
the piston cylinder is connected with the balance cavity through an oil pipe, and the pressure in the cavity is P 2 . The force generated by the friction surfaces of the spring and the friction ring is negligible for the time being.
According to the position shown, pressure P 1 An upward force is generated on the sleeve 1:
FL 1 ＝πP 1 L 1 2
the pressure P is applied to the shaft sleeve 1 and the inner friction ring 4 2 The generated downward force FL 2 ：
FL 2 ＝πP 2 (L 2 2 -L 1 2 )；
L 1 Is the distance between the central line of the pump shaft and the inner side of the balance cavity, L 2 The distance between the central line of the pump shaft and the outer side of the balance cavity. During design, according to the actual pump inlet pressure parameter, the L is reasonably designed 1 And L 2 Can be FL 1 ＝FL 2 And the force generated by the pressure of the hydraulic oil in the balancing component can balance the shaft head force generated by the high-pressure action of the inlet of the centrifugal pump.
Meanwhile, the inner friction ring 4 is directly contacted with a medium containing impurity particles, but bears lower sealing pressure; the outer friction ring 3 directly contacts the hydraulic oil in the balance cavity, and can bear high sealing pressure due to the fact that no impurity particles exist, so that the working state that the same group of friction rings bear high pressure and contact impurity particles is avoided, the service life of the friction ring is prolonged, and the reliability of the friction ring is improved.
Claims (7)
1. The utility model provides a spindle nose power self-adaptation balancing unit which characterized in that: the self-adaptive pressure supply device is characterized by comprising a balance assembly and a self-adaptive pressure supply device, wherein the balance assembly is arranged in a pump cavity between a pump shaft and a pump shell, a balance cavity in the balance assembly is connected with a small piston cylinder of the self-adaptive pressure supply device, a large piston cylinder of the self-adaptive pressure supply device is connected with the pump cavity, the self-adaptive pressure supply device is used for self-adaptively balancing the force generated by the pressure intensity of hydraulic oil in the balance assembly and balancing the shaft head force generated by the high-pressure action of an inlet of the centrifugal pump.
2. The adaptive stub shaft force balancing structure of claim 1, wherein: the shaft sleeve and the friction ring assembly in the balance assembly jointly form a seal between the pump shell and the pump shaft, and an O-shaped ring is adopted between the shaft sleeve and the pump shaft to prevent fluid in the pump cavity from leaking through a gap between the shaft sleeve and the pump shaft.
3. The adaptive stub shaft force balancing structure of claim 2, wherein: the inner friction ring in the balance assembly is arranged between the pump cavity and the balance cavity, contacts impurity particles but is not subjected to high pressure, and prevents fluid in the pump cavity from leaking into the balance cavity.
4. The adaptive stub shaft force balancing structure of claim 2, wherein: the outer friction ring is arranged between the balance cavity and the external environment, bears high pressure and does not contact with impurity particles, and hydraulic oil in the balance cavity is prevented from leaking.
5. The adaptive stub shaft force balancing structure of claim 1, wherein: the large piston in the cylinder body of the self-adaptive pressure supply device is connected with the small piston through a connecting rod, the piston cylinder of the large piston is connected with the pump cavity, the piston cylinder of the small piston is connected with the balance cavity, and high-pressure medium at the inlet of the pump and hydraulic oil in the balance cavity are conveyed through the pipe fitting.
6. The adaptive stub shaft force balancing structure of claim 5, wherein: when the pump inlet is high-pressure, the self-adaptive pressure supply device enables the shaft head force to be balanced with the acting force in the balance cavity by controlling the area ratio of the large piston and the small piston in the piston cylinder and the size of the shaft sleeve, so that the self-adaptive adjustment of the shaft head force of the pump in the pressure change process can be realized.
7. The adaptive stub shaft force balancing structure of claim 1, wherein: the adaptive pressure supply device is arranged on one side of the pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210846125.0A CN115306758A (en) | 2022-07-19 | 2022-07-19 | Self-adaptive balancing device for spindle nose force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210846125.0A CN115306758A (en) | 2022-07-19 | 2022-07-19 | Self-adaptive balancing device for spindle nose force |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115306758A true CN115306758A (en) | 2022-11-08 |
Family
ID=83857454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210846125.0A Pending CN115306758A (en) | 2022-07-19 | 2022-07-19 | Self-adaptive balancing device for spindle nose force |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115306758A (en) |
-
2022
- 2022-07-19 CN CN202210846125.0A patent/CN115306758A/en active Pending
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