CN112412810A

CN112412810A - Centrifugal pump capable of reducing internal pressure pulsation

Info

Publication number: CN112412810A
Application number: CN202011314516.5A
Authority: CN
Inventors: 潘碧琼
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-02-26

Abstract

The invention discloses a centrifugal pump capable of reducing internal pressure pulsation, which comprises a base, wherein the structure of the base is provided with reserved mounting hole sites, the number of the reserved mounting hole sites is four, a pump body and a motor are arranged above the base, a first support column is fixedly arranged between the pump body and the base through bolts, a second support column is fixedly arranged between the motor and the base through bolts, and an input pipeline is fixedly arranged on one side of the pump body, which is far away from the motor, through welding. According to the centrifugal pump capable of reducing the internal pressure pulsation, when the pressure pulsation is generated inside the pump body of the centrifugal pump, and the pressure exceeds the threshold value of the pressure release valve, the piston is pushed and the spring is forced to contract, when the position of the piston is higher than the installation height of the connecting pipe, fluid is automatically discharged and passes through the connecting pipe to enter the input pipeline again to complete pressure release, the internal pressure pulsation of the centrifugal pump is reduced through the mode, and the adverse effect of the overhigh pressure pulsation on the centrifugal pump and supporting facilities is avoided.

Description

Centrifugal pump capable of reducing internal pressure pulsation

Technical Field

The invention relates to the field of centrifugal pumps, in particular to a centrifugal pump capable of reducing internal pressure pulsation.

Background

The centrifugal pump is a pump for conveying a liquid by centrifugal force generated when an impeller rotates. Centrifugal pumps operate by causing water to move centrifugally as a result of the rotation of an impeller. Before the water pump is started, the pump shell and the water suction pipe are filled with water, then the motor is started, the pump shaft drives the impeller and the water to rotate at a high speed, the water is thrown to the outer edge of the impeller to be thrown into a water pressure pipeline of the water pump through a flow channel of the volute-shaped pump shell. The existing centrifugal pump has certain defects when in use, unstable flow is easy to occur in the centrifugal pump, larger pressure pulsation is formed, and certain adverse effects are brought to a centrifugal pump body and supporting facilities.

Disclosure of Invention

The invention mainly aims to provide a centrifugal pump capable of reducing internal pressure pulsation, which can effectively solve the problems in the background art.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a can reduce internal pressure pulsated centrifugal pump, includes the base, set up in the structure of base and reserve the installation hole site, and the quantity of reserving the installation hole site is four groups, the top of base is provided with the pump body and motor, there is first support column through bolt fixed mounting between the pump body and the base, there is the second support column through bolt fixed mounting between motor and the base, one side that the motor was kept away from to the pump body has input pipeline through welded fastening, the outer wall of the pump body has output pipeline through welded fastening.

Preferably, the one end of input pipeline has first ring flange through welded fastening installation, the side of first ring flange is provided with first sealing washer, the top of output pipeline has the second ring flange through welded fastening installation, the top of second ring flange is provided with the second sealing washer.

Preferably, the outer wall of the pump body is provided with a pressure relief valve, the pressure relief valve comprises a connecting pipe, a fixed seat, a supporting pipe body, a first valve body, a second valve body, a third flange plate, a fourth flange plate, a spring, a piston and a one-way valve, and the fixed seat is fixedly connected with the outer wall of the pump body through a bolt.

Preferably, the support pipe body is fixedly installed between the fixing seat and the first valve body through welding, the first valve body is detachably connected with the second valve body, the spring is arranged inside the first valve body and the second valve body, the piston is arranged inside the first valve body, and the spring is located above the piston.

Preferably, the first valve body and the third flange plate are fixed by welding, the second valve body and the fourth flange plate are fixed by welding, the third flange plate and the fourth flange plate are detachably connected by bolts, and a third sealing ring is clamped between the third flange plate and the fourth flange plate.

Preferably, the connecting pipe is fixed with the first valve body through welding, one end, far away from the first valve body, of the connecting pipe is fixed with the input pipeline through welding, and a one-way valve is arranged in the middle of the connecting pipe.

Compared with the prior art, the invention has the following beneficial effects: this can reduce internal pressure pulsating centrifugal pump, when the pump body of centrifugal pump is inside to produce pressure pulsation, local part forms the high pressure, and this position is in the change condition, when pressure surpassed the relief valve threshold value, promote the piston and force the spring shrink, when the piston position is higher than the mounting height of connecting pipe, the fluid is automatic to be discharged, and pass in the connecting pipe reentrant input pipeline, accomplish the pressure release, reduce centrifugal pump internal pressure pulsation through this mode, avoid too high pressure pulsation to cause harmful effects to centrifugal pump itself and supporting facility, do benefit to people and use, whole can reduce internal pressure pulsating centrifugal pump simple structure, high durability and convenient operation, the effect of using is better for traditional mode.

Drawings

Fig. 1 is a front view of a centrifugal pump of the present invention which can reduce internal pressure pulsation.

Fig. 2 is an enlarged view of a in fig. 1 of a centrifugal pump for reducing internal pressure pulsation according to the present invention.

Fig. 3 is a schematic structural diagram of a pressure relief valve in a centrifugal pump capable of reducing internal pressure pulsation according to the present invention.

FIG. 4 is a transverse cross-sectional view of a pump body according to the present invention.

Fig. 5 is an enlarged schematic view of a portion B in fig. 4.

In the figure: 1. a base; 2. a first support column; 3. a second support column; 4. a pump body; 5. a motor; 6. an input pipe; 7. a first flange plate; 8. an output pipe; 9. a second flange plate; 10. a pressure relief valve; 11. a connecting pipe; 12. a fixed seat; 13. supporting the pipe body; 14. a first valve body; 15. a second valve body; 16. a third flange plate; 17. a fourth flange plate; 18. a spring; 19. a piston; 20. a one-way valve.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

The first embodiment is as follows:

as shown in fig. 1 and 2, a centrifugal pump capable of reducing internal pressure pulsation, including a base 1, reserved mounting hole sites are provided in the structure of the base 1, the number of the reserved mounting hole sites is four, the reserved mounting hole sites are matched with fasteners such as bolts, and are used for fixing the base 1, a pump body 4 and a motor 5 are provided above the base 1, a first support column 2 is installed between the pump body 4 and the base 1 through bolt fixing, a second support column 3 is installed between the motor 5 and the base 1 through bolt fixing, the first support column 2 and the second support column 3 respectively support the pump body 4 and the motor 5, an input pipeline 6 is installed on one side of the pump body 4 far away from the motor 5 through welding fixing, and an output pipeline 8 is installed on the outer wall of the pump body 4 through welding fixing.

Example two:

on the basis of the first embodiment, as shown in fig. 1, a first flange 7 is fixedly installed at one end of the input pipeline 6 by welding, a first sealing ring is arranged on the side surface of the first flange 7, a second flange 9 is fixedly installed at the top end of the output pipeline 8 by welding, and a second sealing ring is arranged at the top of the second flange 9, so that the sealing effect after butt joint is improved.

Example three:

on the basis of the first embodiment, as shown in fig. 1, 2 and 3, a pressure relief valve 10 is arranged on the outer wall of the pump body 4, the pressure relief valve 10 is composed of a connecting pipe 11, a fixed seat 12, a supporting pipe body 13, a first valve body 14, a second valve body 15, a third flange 16, a fourth flange 17, a spring 18, a piston 19 and a one-way valve 20, the fixed seat 12 is fixedly connected with the outer wall of the pump body 4 through bolts, and the pressure relief valve 10 can reduce pressure pulsation inside the centrifugal pump and avoid adverse effects of the excessive pressure pulsation on the centrifugal pump and supporting facilities.

Example four:

on the basis of the third embodiment, as shown in fig. 3, the supporting tube 13 is fixedly installed between the fixed seat 12 and the first valve body 14 by welding, the first valve body 14 is detachably connected to the second valve body 15, the spring 18 is disposed inside the first valve body 14 and the second valve body 15, the piston 19 is disposed inside the first valve body 14, the spring 18 is located above the piston 19, when pressure pulsation is generated inside the centrifugal pump body 4, a high pressure is formed in a local portion, and the position is in a changing state, and when the pressure exceeds a threshold value of the pressure relief valve 10, the piston 19 is pushed and the spring 18 is forced to contract.

Example five:

on the basis of the third embodiment, as shown in fig. 3, the first valve body 14 and the third flange 16 are fixed by welding, the second valve body 15 and the fourth flange 17 are fixed by welding, the third flange 16 and the fourth flange 17 are detachably connected by bolts, a third sealing ring is clamped between the third flange 16 and the fourth flange 17, the dismounting operation is simple, the assembly and the fault replacement are facilitated, and the sealing effect after the first valve body 14 and the second valve body 15 are assembled can be improved due to the design of the third sealing ring.

Example six:

on the basis of the first embodiment and the third embodiment, as shown in fig. 2 and fig. 3, the connecting pipe 11 is fixed with the first valve body 14 by welding, one end of the connecting pipe 11, which is far away from the first valve body 14, is fixed with the input pipeline 6 by welding, the middle part of the connecting pipe 11 is provided with the one-way valve 20, when the position of the piston 19 is higher than the installation height of the connecting pipe 11, the fluid is automatically discharged, passes through the connecting pipe 11 and reenters the input pipeline 6, the pressure relief is completed, the internal pressure pulsation of the centrifugal pump is reduced by the way, and the adverse effect of the excessive pressure pulsation on the centrifugal pump and the supporting facilities is avoided.

It should be noted that, the present invention is a centrifugal pump capable of reducing internal pressure pulsation, before use, an input pipe 6 is butted with an input stage of a pipeline system through a first flange 7, an output pipe 8 is butted with an output stage of the pipeline system through a second flange 9, when the centrifugal pump is used, a motor 5 is controlled to start, an impeller is arranged inside a pump body 4, an output shaft of the motor 5 extends into the pump body 4 to be connected with the impeller in a transmission way, the motor 5 drives the impeller to rotate at high speed when the motor 5 operates, centrifugal force is generated when the impeller rotates to convey liquid, when pressure pulsation is generated inside the pump body 4 of the centrifugal pump, a local part forms high pressure, and the position is in a changing state, when the pressure exceeds a threshold value of a pressure relief valve 10, a piston 19 is pushed and a spring 18 is forced to contract, when the position of the piston 19 is higher than the installation height of a connecting pipe 11, the pressure relief is completed, the pressure pulsation in the centrifugal pump is reduced in the mode, the adverse effect on the centrifugal pump and supporting facilities caused by the overhigh pressure pulsation is avoided, and the centrifugal pump is practical.

As shown in fig. 4-5, a rubber diaphragm a13 is arranged in the structure of the pump body 4, a cavity a12 is arranged in the structure of the pump body 4, a strip-shaped through hole is formed in the inner wall of the pump body 4, the strip-shaped through hole is communicated with the cavity a12, the rubber diaphragm a13 is located in the strip-shaped through hole, when pressure pulsation occurs inside the pump body 4 of the centrifugal pump, high pressure is formed in a local area, the position is in a changing state, and when the pressure exceeds the elastic threshold of the rubber diaphragm a13, the rubber diaphragm a13 is forced to bulge towards the inside of the cavity a12, so that the pressure in the area is recovered to be normal, the pressure pulsation inside the pump body 4 is reduced by the method, and adverse effects of the excessively high. When pressure pulsation is generated inside the pump body 4 of the centrifugal pump, high pressure is formed in a local part, the position is in a changing state, and when the pressure exceeds the elastic threshold value of the rubber diaphragm a13, the rubber diaphragm a13 is forced to bulge towards the inside of the cavity a12, so that the pressure in the area is recovered to be normal, the pressure pulsation inside the pump body 4 is reduced through the mode, and adverse effects of the overhigh pressure pulsation on the centrifugal pump and supporting facilities are avoided.

The transverse section of the cavity a12 is arched, an inner arched elastic sheet a15 with an axial line coincident with the axial line of an outer arched surface is arranged in each cavity a12, two sides of the inner arched elastic sheet a15 in the length direction are provided with C-shaped elastic sheets a16 respectively, the outer diameter of the C-shaped elastic sheet a16 is larger than the diameter of the arc surface a17 on two sides of the transverse section of the cavity a12, the outer surface of the C-shaped elastic sheet a16 is in contact with the arc surface a17 of the cavity a12, the C-shaped elastic sheet a16 is radially contracted and deformed to be tightly matched with the arc surface a17, the inner arc concave surface of the inner arched elastic sheet a15 faces the rubber diaphragm a13, and a gap is reserved between the outer arc convex surface of the inner arched elastic sheet a15 and the outer arch.

A plurality of conical springs a18 which are evenly distributed at intervals are arranged on the inner circular arc concave surface of the inner circular arc elastic sheet a15, the large diameter end of each conical spring a18 abuts against one surface, close to the inner circular arc elastic sheet a15, of the rubber diaphragm a13, and the small diameter end of each conical spring a18 is fixed in a positioning hole in the inner circular arc concave surface.

Two ends of the inner arched elastic sheet a15 are respectively connected with an interference part a19, and the free end of the interference part a19 abuts against the outer side of the corresponding side edge of the rubber diaphragm a 13.

When the pressure changes, the rubber diaphragm a13 deforms, the conical spring a18 is compressed, the rubber diaphragm a13 is protected, and the synchronously designed interference part a19 can prevent the rubber diaphragm a13 from being separated from the sealant due to the pressure change.

Example five:

on the basis of the fourth embodiment, as shown in fig. 3, the edge of the rubber membrane 13 is coated with the sealant 14, and the edge of the rubber membrane 13 is fixedly connected with the hole wall of the strip-shaped through hole through the sealant 14, so that the rubber membrane 13 is firmly fixed in the strip-shaped through hole and a good sealing effect is maintained.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A centrifugal pump capable of reducing internal pressure pulsation, comprising a base (1), characterized in that: reserved mounting hole sites are arranged in the structure of the base (1), the number of the reserved mounting hole sites is four, a pump body (4) and a motor (5) are arranged above the base (1), a first support column (2) is fixedly mounted between the pump body (4) and the base (1) through bolts, a second support column (3) is fixedly mounted between the motor (5) and the base (1) through bolts, an input pipeline (6) is fixedly mounted on one side, away from the motor (5), of the pump body (4) through welding, and an output pipeline (8) is fixedly mounted on the outer wall of the pump body (4) through welding;

the outer wall of the pump body (4) is provided with a pressure relief valve (10), the pressure relief valve (10) consists of a connecting pipe (11), a fixed seat (12), a supporting pipe body (13), a first valve body (14), a second valve body (15), a third flange plate (16), a fourth flange plate (17), a spring (18), a piston (19) and a one-way valve (20), and the fixed seat (12) is fixedly connected with the outer wall of the pump body (4) through a bolt;

the supporting pipe body (13) is fixedly installed between the fixed seat (12) and the first valve body (14) through welding, the first valve body (14) is detachably connected with the second valve body (15), the spring (18) is arranged inside the first valve body (14) and the second valve body (15), the piston (19) is arranged inside the first valve body (14), and the spring (18) is located above the piston (19);

the connecting pipe (11) is fixed with the first valve body (14) through welding, one end, far away from the first valve body (14), of the connecting pipe (11) is fixed with the input pipeline (6) through welding, and the middle of the connecting pipe (11) is provided with the check valve (20).

2. The centrifugal pump capable of reducing internal pressure pulsation according to claim 1, wherein: the one end of input pipeline (6) is passed through welded fastening and is installed first ring flange (7), the side of first ring flange (7) is provided with first sealing washer, the top of output pipeline (8) is passed through welded fastening and is installed second ring flange (9), the top of second ring flange (9) is provided with the second sealing washer.

3. The centrifugal pump capable of reducing internal pressure pulsation according to claim 1, wherein: the valve is characterized in that the first valve body (14) and the third flange plate (16) are fixed through welding, the second valve body (15) and the fourth flange plate (17) are fixed through welding, the third flange plate (16) and the fourth flange plate (17) are detachably connected through bolts, and a third sealing ring is clamped between the third flange plate (16) and the fourth flange plate (17).