CN215333446U - Chemical centrifugal pump for conveying medium containing solid particles - Google Patents

Abstract

The application discloses carry chemical centrifugal pump that contains solid particle medium belongs to the centrifugal pump field, has solved and has got into current chemical centrifugal pump when the medium that contains solid particle and can accelerate the problem of the wearing and tearing of overflowing parts and mechanical seal. An impeller of the chemical centrifugal pump is fixed at one end of a pump shaft through an impeller nut, and then a mechanical seal is sleeved on the pump shaft after a sheath is sleeved on the pump shaft; the mounting end face of the pump body is fixed with the fixed side of the pump cover to form a mounting cavity; one end of the pump shaft, which is provided with the impeller, extends into the placing cavity, and is mechanically sealed and clamped at the mounting opening of the pump cover; the inner cavity of the pump cover is in a table body shape, and the area of an opening positioned on the fixed side is larger than that of an installation opening on the opposite side; be provided with the guiding gutter on the inside wall of the inner chamber of pump cover, the guiding gutter extends to installing port place end by the open-ended place end of the fixed side of pump cover. The application can greatly reduce the abrasion of the medium containing solid particles to the flow passage component and the mechanical seal of the chemical centrifugal pump.

Description

Chemical centrifugal pump for conveying medium containing solid particles

Technical Field

The application relates to the technical field of centrifugal pumps, in particular to a chemical centrifugal pump for conveying media containing solid particles.

Background

At present, in the petrochemical industry, complex and severe working conditions of conveying media containing solid particles are often required, and the media containing the solid particles have the characteristics of abrasion, corrosion and the like. The structure of the cavity of the pump cover of the existing chemical centrifugal pump for arranging the mechanical seal can not be removed once a medium containing solid particles enters the cavity, so that the abrasion of the flow passage component and the mechanical seal can be accelerated, and the service life of the flow passage component and the mechanical seal is seriously influenced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a carry chemical centrifugal pump that contains solid particle medium, can solve and can't get rid of in the cavity of the pump cover that the medium that contains solid particle got into current chemical centrifugal pump, can accelerate the problem of overflowing parts and mechanical seal's wearing and tearing.

The embodiment of the utility model provides a chemical centrifugal pump for conveying media containing solid particles, which comprises a pump shaft, a mechanical seal, a sheath, a pump cover, an impeller nut and a pump body, wherein the pump shaft is arranged on the pump body; the impeller is fixed at one end of the pump shaft through the impeller nut, and then the mechanical seal is sleeved after the pump shaft is sleeved with the sheath; the mounting end face of the pump body is fixed with the fixed side of the pump cover to form a placing cavity; one end of the pump shaft, provided with the impeller, extends into the placing cavity, and the mechanical seal is clamped at the mounting opening of the pump cover; the inner cavity of the pump cover is in a table body shape, and the area of an opening positioned on the fixed side is larger than that of an installation opening on the opposite side; a diversion trench is formed in the inner side wall of the inner cavity of the pump cover, and the diversion trench extends from the end, where the opening is formed, of the fixed side of the pump cover to the end, where the mounting opening is formed.

In a possible implementation manner, the diversion trench includes a plurality of elongated trenches, the plurality of elongated trenches are circumferentially arrayed along an inner side wall of an inner cavity of the pump cover, and a length extending direction of the elongated trenches is parallel to an extending direction of the inner side wall; or the diversion trench comprises a spiral groove, and the spiral groove is spirally arranged on the inner side wall of the inner cavity of the pump cover in a spiral direction consistent with the spiral direction of the chemical centrifugal pump.

In one possible implementation mode, the chemical centrifugal pump for conveying the medium containing the solid particles further comprises a front wear-resisting plate; the front wear-resistant plate is arranged in a gap between the inner side wall of the pump body and the front surface of the impeller and is fixed with the pump body, and the shape of the surface, close to the impeller, of the front wear-resistant plate is consistent with that of the front surface of the impeller; and/or, further comprising a rear wear plate; the rear wear-resistant plate is arranged in a gap between the back face of the impeller and the fixed side of the pump cover, the shape of the surface, close to the impeller, of the rear wear-resistant plate is consistent with that of the back face of the impeller, and the surface, close to the pump cover, of the rear wear-resistant plate is clamped on the pump cover.

In one possible implementation, the gap between the front wear plate and the impeller is less than or equal to 1mm, and/or the gap between the impeller and the rear wear plate is less than or equal to 1 mm.

In one possible implementation, the impeller is a full open impeller.

In a possible implementation manner, at least one strip-shaped back rib is arranged at a position corresponding to each blade on the back surface of the back cover plate of the impeller; at least one back rib extends from the mounting sleeve of the impeller to the tip of the blade along the rotation direction of the blade.

In one possible implementation, the mechanical seal is of the external spring rest type.

One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

the embodiment of the utility model provides a chemical centrifugal pump for conveying media containing solid particles. The impeller is fixed at one end of the pump shaft through an impeller nut, and then a sheath is sleeved on the pump shaft and then a mechanical seal is sleeved on the sheath. The mounting end face of the pump body is fixed with the fixed side of the pump cover to form a placing cavity. One end of the pump shaft, which is provided with the impeller, extends into the placing cavity, and the mechanical seal is clamped at the mounting opening of the pump cover. The inner cavity of the pump cover is in a table body shape, and the area of the opening positioned on the fixed side is larger than that of the mounting opening on the opposite side. Be provided with the guiding gutter on the inside wall of the inner chamber of pump cover, the guiding gutter extends to installing port place end by the open-ended place end of the fixed side of pump cover. The utility model provides a chemical centrifugal pump, because the inner chamber of pump cover is the stage body form, the inside wall of this inner chamber is provided with the guiding gutter moreover, and when its medium that carries and contain solid particle, the structure of this pump cover can conveniently contain solid particle's medium and circulate fast to can greatly reduce medium to chemical centrifugal pump's the wearing and tearing that flow through parts and mechanical seal, and then can prolong chemical centrifugal pump's life.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a chemical centrifugal pump for conveying a solid particle-containing medium according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a pump cover with elongated slots according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a pump cover provided with a spiral groove according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a front face of a fully open impeller provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of a back surface of a fully open impeller according to an embodiment of the present application.

Icon: 1-a pump shaft; 2, mechanical sealing; 3-a sheath; 4-pump cover; 41-a flow guide groove; 411-elongated slots; 412-helical groove; 5-an impeller; 51-leaf blade; 52-back ribs; 53-mounting a shaft sleeve; 6-impeller nut; 7-a pump body; 8-front wear plate; 9-rear wear plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

Referring to fig. 1, an embodiment of the present invention provides a chemical centrifugal pump for conveying a medium containing solid particles, including a pump shaft 1, a mechanical seal 2, a sheath 3, a pump cover 4, an impeller 5, an impeller nut 6, and a pump body 7. The impeller 5 is fixed at one end of the pump shaft 1 through an impeller nut 6, and then the mechanical seal 2 is sleeved on the pump shaft 1 after the sheath 3 is sleeved on the pump shaft. The mounting end face of the pump body 7 (the right end face of the pump body 7 in fig. 1) is fixed to the fixed side of the pump cover 4 (the left side of the pump cover 4 in fig. 1) to form a mounting chamber, and specifically, the mounting end face of the pump body 7 is fixed to the fixed side of the pump cover 4 by a connecting bolt. One end of the pump shaft 1, which is provided with the impeller 5, extends into the placing cavity, and the mechanical seal 2 is clamped at the mounting opening of the pump cover 4. The inner cavity of the pump cover 4 is in a frustum shape, and the area of the opening on the fixed side is larger than the area of the mounting opening on the opposite side, that is, the inner cavity of the pump cover 4 has a certain taper, and the taper is set according to the content of solid particles in an actual medium and the volume of the chemical centrifugal pump, for example, fig. 2 shows a structural schematic diagram that the taper of the inner cavity of the pump cover 4 is 10 degrees, and fig. 3 shows a structural schematic diagram that the taper of the inner cavity of the pump cover 4 is 50 degrees. The inner side wall of the inner cavity of the pump cover 4 is provided with a guide groove 41, and the guide groove 41 extends from the end of the opening of the fixed side of the pump cover 4 to the end of the mounting opening. The inner cavity of the general pump cover 4, i.e. the mechanical seal cavity, is a cylindrical cavity, and once solid-containing medium particles enter the inner cavity, the solid-containing medium particles cannot be removed, so that the abrasion of the flow passage component and the mechanical seal 2 is accelerated, and the service life of the flow passage component and the mechanical seal 2 is seriously influenced. The inner cavity of the pump cover 4 of the embodiment of the application is in a frustum shape, so that the medium can be conveniently circulated better.

According to the chemical centrifugal pump provided by the embodiment of the utility model, the inner cavity of the pump cover 4 is in a table shape, and the inner side wall of the inner cavity is provided with the guide groove 41, so that when a medium containing solid particles is conveyed, the structure of the pump cover 4 can facilitate the medium containing the solid particles to rapidly circulate, the abrasion of the medium on a flow passage component and a mechanical seal 2 of the chemical centrifugal pump can be greatly reduced, and the service life of the chemical centrifugal pump can be further prolonged.

Referring to fig. 2, the flow guide groove 41 includes a plurality of elongated grooves 411, the plurality of elongated grooves 411 are circumferentially arranged along the inner sidewall of the inner cavity of the pump cover 4 in an array manner, and the length extending direction of the elongated grooves 411 is parallel to the extending direction of the inner sidewall. After the chemical centrifugal pump is stopped, the long groove 411 is beneficial to the medium containing solid particles to flow out of the inner cavity of the pump cover 4 along the long groove 411, and the medium is prevented from being accumulated on the end face of the friction pair of the mechanical seal 2, so that the mechanical seal 2 is prevented from being damaged when the chemical centrifugal pump is restarted, and the service life of the mechanical seal 2 is prevented from being influenced. Of course, the number of the strip slots 411 may be determined according to the content of solid particles in the medium to be actually conveyed, and fig. 2 shows a schematic structure in which the strip slots 411 are eight.

Alternatively, as shown in fig. 3, the guide groove 41 includes a spiral groove 412, and the spiral groove 412 is spirally disposed on the inner side wall of the inner cavity of the pump cover 4 in a spiral direction consistent with the spiral direction of the chemical centrifugal pump. After the chemical centrifugal pump is stopped, the spiral groove 412 facilitates the medium containing solid particles to be discharged out of the inner cavity of the pump cover 4 along the spiral groove 412. Meanwhile, in the operation process of the chemical centrifugal pump, the medium is not smoothly circulated in the inner cavity of the pump cover 4 easily or a dead zone is formed, the medium in the inner cavity of the pump cover 4 is driven by the rotation of the pump shaft 1 to generate centrifugal force, the spiral groove 412 is arranged, and once the solid particles in the medium enter the inner cavity of the pump cover 4, the solid particles flow along the spiral groove 412 and are quickly thrown out of the inner cavity, so that the mechanical seal 2 and the pump cover 4 can be prevented from being worn by the medium in the inner cavity of the pump cover 4 in a rotating motion mode for a long time, and the conveying efficiency and the service life of the chemical centrifugal pump can be improved.

In practical application, the solid particle content in the medium containing solid particles conveyed by the chemical centrifugal pump is different, the pump cover 4 provided with the long groove 411 is often selected for the medium with lower solid particle content, and the pump cover 4 provided with the spiral groove 412 is often selected for the medium with higher solid particle content.

As shown in figure 1, the chemical centrifugal pump for conveying solid particle-containing media further comprises a front wear-resisting plate 8. The front wear plate 8 is arranged in a gap between the inner side wall of the pump body 7 and the front surface of the impeller 5 and fixed with the pump body 7, and the shape of the surface of the front wear plate 8 close to the impeller 5 is consistent with the shape of the front surface of the impeller 5. Optionally, the front wear-resisting plate 8 and the pump body 7 can be fixed by hexagon socket head flat round head screws, and then the screw head and the front wear-resisting plate 8 are assembled and welded into a whole.

And/or, the chemical centrifugal pump further comprises a rear wear plate 9, that is, the chemical centrifugal pump may only comprise the front wear plate 8, may only comprise the rear wear plate 9, and may also comprise both the front wear plate 8 and the rear wear plate 9.

The rear wear plate 9 is arranged in a gap between the back surface of the impeller 5 and the fixed side of the pump cover 4, the shape of the surface, close to the impeller 5, of the rear wear plate 9 is consistent with the shape of the back surface of the impeller 5, and the surface, close to the pump cover 4, of the rear wear plate 9 is clamped on the pump cover 4. As shown in fig. 1, the shape design of the position of the right end of the rear wear plate 9 is consistent with the shape design of the position of the fixed side of the pump cover 4, and when the pump cover is actually installed, the rear wear plate 9 can be clamped on the pump cover 4 after the right end of the rear wear plate 9 is buckled with the fixed side of the pump cover 4. Of course, as shown in fig. 1, since the inner cavity of the pump cover 4 is in a table shape, the inner cavity of the rear wear-resistant plate 9 is also in a table shape, and when the rear wear-resistant plate 9 is completely installed, the inner sidewall of the inner cavity of the pump cover 4 and the inner sidewall of the inner cavity of the rear wear-resistant plate 9 are combined into a same circular table.

In practical application, when the chemical centrifugal pump carries the medium that contains solid particle, the chemical centrifugal pump during operation, the rotatory doing work of impeller 5, solid particle easy wearing and tearing pump body 7 with the inside wall that impeller 5 is close to and the fixed side that pump cover 4 is close to with impeller 5, because preceding antifriction plate 8 and back antifriction plate 9 can be changed and change the convenience, thereby preceding antifriction plate 8 and back antifriction plate 9's setting, shift this wearing parts of pump body 7 of chemical centrifugal pump to the preceding antifriction plate 8 with lower cost, this wearing parts of pump cover 4 of chemical pump shifts to the back antifriction plate 9 with lower cost, reduce the replacement cost that chemical centrifugal pump spare part changed. The chemical centrifugal pump provides a reliable and stable operation's equipment for carrying the medium that contains the solid particle, both can guarantee chemical centrifugal pump and mechanical seal 2's life, also can reduce the replacement cost, the production and the purchase cost of wearing parts.

Further, the gap between the front wear-resistant plate 8 and the impeller 5 is less than or equal to 1mm, and/or the gap between the impeller 5 and the rear wear-resistant plate 9 is less than or equal to 1mm, that is, only the gap between the front wear-resistant plate 8 and the impeller 5 is less than or equal to 1mm, or only the gap between the impeller 5 and the rear wear-resistant plate 9 is less than or equal to 1mm, or both the gap between the front wear-resistant plate 8 and the impeller 5 and the gap between the impeller 5 and the rear wear-resistant plate 9 are less than or equal to 1 mm. When the gap is too large, the conveyed media can flow back, so that part of the media are conveyed to the inlet of the pump or the inner cavity of the pump cover 4, when the gap is too small, the front wear-resistant plate 8 and the impeller 5 or the impeller 5 and the rear wear-resistant plate 9 can rub or lock with each other, the impeller 5 is prevented from rotating, the gap is smaller than or equal to 1mm, the disc friction coefficient of the chemical centrifugal pump is reduced, and the efficiency of the chemical centrifugal pump can be improved.

Referring to fig. 4, an impeller 5 of a chemical centrifugal pump for conveying a medium containing solid particles according to an embodiment of the present application is a fully open impeller.

In practical application, a chemical centrifugal pump which is generally clean under a working condition is a closed impeller, the closed impeller is in a structure of a mouth ring and a balance hole, and when a medium containing solid particles is conveyed, the medium containing the solid particles is accumulated at the mouth ring to form a grinding wheel effect, so that the abrasion of the impeller and a pump body is accelerated, and the service life of the chemical centrifugal pump is seriously shortened. And the full open type impeller can reduce the abrasion of solid particle media to the impeller 5 when the media containing the solid particles are conveyed, thereby prolonging the service life of the chemical centrifugal pump.

As shown in fig. 5, at least one strip-shaped back rib 52 is disposed on the back surface of the back cover plate of the impeller 5 at a position corresponding to each blade 51. At least one back rib 52 extends from the mounting boss 53 of the impeller 5 in the rotational direction of the blade 51 to the tip of the blade 51. In practice, the number of the back ribs 52 can be set according to requirements, and fig. 5 shows a structural schematic diagram of one back rib 52 provided at a corresponding position of each blade 51, and there are six blades 51 in the schematic diagram, so that six back ribs 52 are provided in total.

The back rib 52 is equivalent to an auxiliary blade of the impeller 5, when the impeller 5 rotates to do work, the outlet of the impeller 5 is a high-pressure area, the inner cavity of the pump cover 4 is a low-pressure area, and the back rib 52 can perform suction forced circulation conveying on media in the inner cavity of the pump cover 4 to prevent the media containing solid particles from being accumulated in the inner cavity of the pump cover 4.

As shown in fig. 1, the mechanical seal 2 of the chemical centrifugal pump for conveying media containing solid particles provided in the embodiment of the present application is of a static type with an external spring, and the arrangement mode is 3CW-BB, when the chemical centrifugal pump conveys media containing solid particles, the spring of the mechanical seal 2 does not contact with the media, so that the solid particles in the media do not damage parts such as the spring of the mechanical seal 2, the mechanical seal 2 is prevented from being corroded by the spring and from causing the spring to lose efficacy due to crystals, and the service life of the mechanical seal 2 and the chemical centrifugal pump can be further prolonged.

The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure.

Claims (7)

1. A chemical centrifugal pump for conveying media containing solid particles is characterized by comprising a pump shaft, a mechanical seal, a sheath, a pump cover, an impeller nut and a pump body;

the impeller is fixed at one end of the pump shaft through the impeller nut, and then the mechanical seal is sleeved after the pump shaft is sleeved with the sheath;

the mounting end face of the pump body is fixed with the fixed side of the pump cover to form a placing cavity;

one end of the pump shaft, provided with the impeller, extends into the placing cavity, and the mechanical seal is clamped at the mounting opening of the pump cover;

the inner cavity of the pump cover is in a table body shape, and the area of an opening positioned on the fixed side is larger than that of an installation opening on the opposite side;

a diversion trench is formed in the inner side wall of the inner cavity of the pump cover, and the diversion trench extends from the end, where the opening is formed, of the fixed side of the pump cover to the end, where the mounting opening is formed.

2. The chemical centrifugal pump for conveying media containing solid particles as claimed in claim 1, wherein the flow guide groove comprises a plurality of elongated grooves, the plurality of elongated grooves are circumferentially arrayed along the inner side wall of the inner cavity of the pump cover, and the length extension direction of the elongated grooves is parallel to the extension direction of the inner side wall;

or the diversion trench comprises a spiral groove, and the spiral groove is spirally arranged on the inner side wall of the inner cavity of the pump cover in a spiral direction consistent with the spiral direction of the chemical centrifugal pump.

3. The chemical centrifugal pump for conveying media containing solid particles as recited in claim 1, further comprising a front wear plate;

the front wear-resistant plate is arranged in a gap between the inner side wall of the pump body and the front surface of the impeller and is fixed with the pump body, and the shape of the surface, close to the impeller, of the front wear-resistant plate is consistent with that of the front surface of the impeller;

and/or, further comprising a rear wear plate;

the rear wear-resistant plate is arranged in a gap between the back face of the impeller and the fixed side of the pump cover, the shape of the surface, close to the impeller, of the rear wear-resistant plate is consistent with that of the back face of the impeller, and the surface, close to the pump cover, of the rear wear-resistant plate is clamped on the pump cover.

4. The chemical centrifugal pump for conveying media containing solid particles as claimed in claim 3, wherein the gap between the front wear plate and the impeller is less than or equal to 1mm, and/or the gap between the impeller and the rear wear plate is less than or equal to 1 mm.

5. The chemical centrifugal pump for conveying media containing solid particles as claimed in any one of claims 1 to 4, wherein the impeller is a fully open impeller.

6. The chemical centrifugal pump for conveying media containing solid particles as claimed in claim 5, wherein at least one strip-shaped back rib is arranged on the back surface of the back cover plate of the impeller at a position corresponding to each blade;

at least one back rib extends from the mounting sleeve of the impeller to the tip of the blade along the rotation direction of the blade.

7. The chemical centrifugal pump for conveying media containing solid particles as claimed in any one of claims 1 to 4, wherein the mechanical seal is of a static type with an external spring.

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