CN212225540U - Pressure regulating device for inhibiting centrifugal pump cavitation impeller - Google Patents
Pressure regulating device for inhibiting centrifugal pump cavitation impeller Download PDFInfo
- Publication number
- CN212225540U CN212225540U CN202020730023.9U CN202020730023U CN212225540U CN 212225540 U CN212225540 U CN 212225540U CN 202020730023 U CN202020730023 U CN 202020730023U CN 212225540 U CN212225540 U CN 212225540U
- Authority
- CN
- China
- Prior art keywords
- centrifugal pump
- pressure regulating
- valve
- cavitation
- communicated
- 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.)
- Active
Links
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model discloses a pressure regulating device for inhibiting centrifugal pump cavitation impeller, which comprises a plurality of return pipes, a pressure regulating valve and an annular liquid supplementing device; the annular liquid supplementing device is communicated with the inlet section of the centrifugal pump, one end of the return pipe is communicated with the outlet section of the centrifugal pump, and the other end of the return pipe is communicated with the annular liquid supplementing device; the pressure regulating valve is connected to the return pipe and used for controlling the conduction or the closing of liquid in the return pipe. A restrain centrifugal pump cavitation impeller regulator, can improve the liquid pressure of centrifugal pump induction zone, effectively reduce the influence of cavitation to the centrifugal pump.
Description
Technical Field
The utility model relates to a supporting device of centrifugal pump especially relates to a restrain centrifugal pump cavitation impeller regulator.
Background
Cavitation is a complex phase change phenomenon occurring in liquid, and when the local pressure inside the liquid is lower than the saturated vapor pressure of the corresponding temperature, cavitation nuclei in the liquid grow into cavitation bubbles; when the local pressure recovers, the cavitation bubbles collapse. Collapse of the cavitation bubbles occurs in a very short time while releasing a large amount of energy. If collapse of the cavitation bubbles occurs near the flow passage wall surface, an impact load is applied to the flow passage wall surface. Repeated collapse of cavitation bubbles can cause damage to the flow components, i.e., cavitation. Cavitation erosion is a common phenomenon in fluid machinery and engineering, can affect the operating efficiency of the fluid machinery, and can damage flow passage components in serious cases. The centrifugal pump is a common hydraulic machine, unstable cavitation flow in the centrifugal pump can damage stable operation of the pump, induce a plurality of problems such as vibration, noise and the like, and can cause failure of equipment in severe cases. And the pressure at the impeller inlet is lower than the saturated steam pressure, which is an important reason for the cavitation of the centrifugal pump.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the utility model provides a pressure regulating device for inhibiting the cavitation of the centrifugal pump impeller, which is used for improving the pressure at the inlet of the impeller and the cavitation degree of the impeller,
the technical scheme is as follows: in order to achieve the purpose, the pressure regulating device for inhibiting the centrifugal pump cavitation impeller comprises a plurality of backflow pipes, a pressure regulating valve and an annular liquid supplementing device; the annular liquid supplementing device is communicated with the inlet section of the centrifugal pump, one end of the return pipe is communicated with the outlet section of the centrifugal pump, and the other end of the return pipe is communicated with the annular liquid supplementing device; the pressure regulating valve is connected to the return pipe and used for controlling the conduction or the closing of liquid in the return pipe.
Furthermore, a plurality of inflow pipes are arranged at intervals at the inlet section of the centrifugal pump; the backflow pipes are communicated with the runners on the centrifugal pump one by one, the inflow pipe and the backflow pipe are communicated with the annular liquid replenisher, and the inflow pipe and the backflow pipe are alternately arranged at intervals.
Further, the pressure regulating valve comprises a valve body and a valve core; the front end of the valve body is provided with a liquid inlet, the rear end of the valve body is provided with a liquid outlet, the valve core is connected in an inner cavity of the valve body in a sliding manner, and the valve core can enable the liquid inlet and the liquid outlet to be communicated or closed by sliding; the inlet is close to the export section setting of centrifugal pump, the liquid outlet is close to annular fluid infusion ware setting.
Further, the pressure regulating valve also comprises a valve cover and a spring; the valve cover is connected to the rear end of the valve body, the spring is arranged in the inner cavity of the valve body, and two ends of the spring are respectively connected with the valve core and the valve cover in a jacking mode.
Further, the valve core comprises a gland, a body and a core head; one end of the body is sleeved and connected in the gland, and the other end of the body is connected with the core print through threads; a sealing gasket is connected between the body and the core head, and a sealing ring is connected between the body and the gland.
Further, the end of the core print is tapered.
Has the advantages that: the utility model relates to a pressure regulating device for inhibiting centrifugal pump cavitation impeller, which is characterized in that an inlet section and an outlet section of a centrifugal pump are communicated through a return pipe and an annular liquid supplement device; when the liquid pressure of the outlet section is greater than that of the inlet section, the pressure regulating valve is opened, and high-pressure liquid enters the inlet section from the outlet section, so that the liquid pressure of the inlet section is improved, and the cavitation at the inlet pipe of the impeller can be effectively relieved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a sectional view of the pressure regulating valve according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
A pressure regulating device for inhibiting centrifugal pump cavitation impeller comprises a plurality of return pipes 1, a pressure regulating valve 2 and an annular liquid supplementing device 3. The inlet section a of the centrifugal pump 4 is provided with a flange 16, with flow channels being formed between adjacent blades in the centrifugal pump 4. The annular liquid supplementing device 3 is arranged around the flange 16 in a circle, a plurality of inflow pipes 5 are arranged on the flange 16 at intervals, one end of each inflow pipe 5 is communicated with the centrifugal pump 4, and the other end of each inflow pipe 5 is communicated with the annular liquid supplementing device 3. An opening is arranged in the middle of the flow channel 17, one end of the return pipe 1 is connected with the opening, and the other end of the return pipe is communicated with the annular liquid supplementing device 3. The pressure regulating valve 2 is connected to the return pipe 1. When the liquid pressure of the outlet section b of the centrifugal pump 4 is greater than that of the inlet section of the centrifugal pump 4, the pressure regulating valve is opened, high-pressure liquid flows into the inlet section of the centrifugal pump, the liquid pressure of the inlet is improved, and impeller cavitation can be effectively reduced; when the pressure of the outlet section is less than or equal to the pressure of the inlet section, the pressure regulating valve 2 is closed.
The inflow pipe 5 and the return pipe 1 are distributed on two sides of the annular fluid infusion device 3 and are communicated with the annular fluid infusion device 3. The inlet pipe 5 and the return pipe 1 are alternately distributed at intervals.
The pressure regulating valve comprises a valve body 6, a valve core 7, a valve cover 10 and a spring 11. The valve body 6 is of a cavity-shaped structure, a liquid inlet 8 is arranged at the front end of the valve body 6, and a liquid outlet 9 is arranged at the rear end of the valve body 6. The valve core 7 is connected in the inner cavity of the valve body 6 in a sliding way, and the valve core 7 can enable the liquid inlet 8 and the liquid outlet 9 to be communicated or closed by sliding; the inlet 8 is close to the outlet section of the centrifugal pump 4, and the outlet 9 is close to the annular liquid infusion device 3. The valve cover 10 is connected to the rear end of the valve body 6, the spring 11 is arranged in the inner cavity of the valve body 6, and two ends of the spring 11 are respectively connected with the valve core 7 and the valve cover 10 in a jacking mode. The valve core 7 comprises a gland 17, a body 12 and a core head 13; one end of the body 12 is sleeved and connected in the gland 17, and the other end is in threaded connection with the core print 13; a sealing gasket 14 is connected between the body 12 and the core print 13, and a sealing ring 15 is connected between the body 12 and the gland 17.
The opening pressure of the pressure regulating valve is determined by a spring, and different pressure regulating valves are selected for different centrifugal pumps. Specifically, the method comprises the following steps: assuming that the outlet pressure of the centrifugal pump is P1, the saturation steam pressure at the corresponding temperature is Pv, the acting area of the core head 13 is A, and x is the distance from the lower end surface of the body 12 to the liquid inlet in the initial state, the elastic coefficient k of the spring is (P1-Pv) A/x, and then the spring is selected according to the area of the cover plate 11 on the valve body 6 and the distance of the valve cover 10 in the pressure regulating valve.
In order to make the flow rate of the core 13 more uniform, the end of the core 13 is tapered: when the pressure regulating valve is opened, the action area of the high-pressure fluid on the core head 13 is changed along with the opening of the pressure regulating valve, so that the flow of high-pressure water flowing through the valve is stable when the pressure regulating valve is opened, the inlet pressure of the impeller is increased, the cavitation in the centrifugal pump is relieved, and meanwhile, the high-pressure fluid can be ensured to continuously and stably enter the inlet pipe of the impeller, and the interference on the operation of the pump is reduced.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (6)
1. The utility model provides a restrain centrifugal pump cavitation impeller pressure regulating device which characterized in that: comprises a plurality of return pipes (1), a pressure regulating valve (2) and an annular liquid supplementing device (3); the annular liquid supplementing device (3) is communicated with an inlet section of the centrifugal pump (4), one end of the return pipe (1) is communicated with an outlet section of the centrifugal pump (4), and the other end of the return pipe is communicated with the annular liquid supplementing device (3); the pressure regulating valve (2) is connected to the return pipe (1) and is used for controlling the conduction or the closing of liquid in the return pipe (1).
2. The pressure regulating device for inhibiting the cavitation of the centrifugal pump impeller according to claim 1, wherein: a plurality of inflow pipes (5) are arranged at intervals at the inlet section of the centrifugal pump (4); the backflow pipes (1) are communicated with the runners on the centrifugal pump (4) one by one, the inflow pipe (5) and the backflow pipe (1) are communicated with the annular liquid supplementing device (3), and the inflow pipe (5) and the backflow pipe (1) are alternately arranged at intervals.
3. The pressure regulating device for inhibiting the cavitation of the centrifugal pump impeller according to claim 1, wherein: the pressure regulating valve (2) comprises a valve body (6) and a valve core (7); a liquid inlet (8) is formed in the front end of the valve body (6), a liquid outlet (9) is formed in the rear end of the valve body (6), the valve core (7) is connected in an inner cavity of the valve body (6) in a sliding mode, and the valve core (7) can enable the liquid inlet (8) and the liquid outlet (9) to be communicated or closed in a sliding mode; the liquid inlet (8) is close to the outlet section of the centrifugal pump (4) and the liquid outlet (9) is close to the annular liquid supplementing device (3).
4. The pressure regulating device for inhibiting the cavitation of the centrifugal pump impeller according to claim 3, wherein: the pressure regulating valve (2) further comprises a valve cover (10) and a spring (11); the valve cover (10) is connected to the rear end of the valve body (6), the spring (11) is arranged in the inner cavity of the valve body (6), and two ends of the spring (11) are respectively connected with the valve core (7) and the valve cover (10) in a jacking mode.
5. The pressure regulating device for inhibiting the cavitation of the centrifugal pump impeller according to claim 3, wherein: the valve core (7) comprises a gland (17), a body (12) and a core head (13); one end of the body (12) is sleeved and connected in the gland (17), and the other end of the body is in threaded connection with the core print (13); a sealing gasket (14) is connected between the body (12) and the core print (13), and a sealing ring (15) is connected between the body (12) and the gland (17).
6. The pressure regulating device for inhibiting the cavitation of the centrifugal pump impeller according to claim 5, wherein: the end of the core print (13) is conical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020730023.9U CN212225540U (en) | 2020-05-07 | 2020-05-07 | Pressure regulating device for inhibiting centrifugal pump cavitation impeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020730023.9U CN212225540U (en) | 2020-05-07 | 2020-05-07 | Pressure regulating device for inhibiting centrifugal pump cavitation impeller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212225540U true CN212225540U (en) | 2020-12-25 |
Family
ID=73908256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020730023.9U Active CN212225540U (en) | 2020-05-07 | 2020-05-07 | Pressure regulating device for inhibiting centrifugal pump cavitation impeller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212225540U (en) |
-
2020
- 2020-05-07 CN CN202020730023.9U patent/CN212225540U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202868037U (en) | Water-feeding pump recycling valve | |
| CN206309972U (en) | A kind of Cascade Multistage decompression high-differential-pressure regulating valve | |
| CN103968149A (en) | Axial-flow type maze throttling structure | |
| CN105090094A (en) | Device for improving mechanical sealing of industrial centrifugal pump machine | |
| CN113389940A (en) | Improvement method of regulating system for preventing flash evaporation and cavitation erosion | |
| CN212225540U (en) | Pressure regulating device for inhibiting centrifugal pump cavitation impeller | |
| CN106286857B (en) | A kind of New-type boiler continuous blowdown regulating valve | |
| CN208041202U (en) | Orifice-plate type is anti-cavitation, noise reduction high-pressure difference regulating ball valve | |
| CN202598109U (en) | Draining valve with a plurality of stages of throttle orifice plates | |
| CN105805046A (en) | Device for improving internal flow stability of diagonal flow pump | |
| CN216112187U (en) | High-precision adjusting valve suitable for deep peak regulation working condition of thermal power plant | |
| CN210769564U (en) | Cavitation-proof double-suction pump impeller device with adjustable circumferential angle | |
| CN205136715U (en) | Labyrinth multi stage decompression governing valve | |
| CN204663903U (en) | A kind of jet pump device | |
| CN207598589U (en) | Inhibit the centrifugal pump device of impeller blade cavitation | |
| CN203880213U (en) | Axial-flow type labyrinth throttling structure | |
| CN112524085A (en) | Internal circulation type centrifugal pump axial force balance structure with multiple back mouth rings | |
| CN202926598U (en) | Self-propelling automatic re-circulating pump protection valve | |
| CN207212745U (en) | A kind of cavitation-preventive centrifugal pump closed type impeller structure | |
| CN210218009U (en) | Four-plunger type high-pressure plunger pump | |
| CN207740181U (en) | A kind of double outlet multipurpose external-mix self-priming pumps with similar spiral shape suction chamber | |
| CN203857186U (en) | Spiral throttling device | |
| CN204533719U (en) | External seal butterfly valve diverter unit | |
| CN219734406U (en) | High pressure difference cavitation-proof valve | |
| CN110206938A (en) | A kind of orifice type high proportion decompression energy dissipating valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |