CN211874736U - Anticorrosive submerged centrifugal slurry pump - Google Patents

Abstract

The utility model provides a centrifugal slurry pump under anticorrosive liquid, including the vertical pump body, the pump body include the pump case and with pump case sealing connection's pump cover, the terminal oral ring of pump case is provided with one-level location step, divide into two axial mounting holes of size with the oral ring, the pump cover includes apron and boss, the boss is inserted and is located in little axial mounting hole, the flange limit crimping of apron is in one-level location step surface, annular clamping groove has been seted up to big axial mounting hole inner wall, the inside card of annular clamping groove is equipped with the location snap ring, location snap ring axial is spacing, compress tightly the apron in one-level location step surface, the inboard of location snap ring is provided with the snap ring clamping ring, the snap ring clamping ring includes vertical portion and horizontal part, vertical portion radially spacing compressing tightly in annular clamping groove with the location. The utility model discloses a pump cover is dismantled conveniently, and the pump cover can not blocked by sand grain, and sealing performance is good between pump case, the pump cover.

Description

Anticorrosive submerged centrifugal slurry pump

Technical Field

The utility model relates to a vertical submerged pump especially relates to the pump cover of anticorrosive submerged pump and the mounting structure of the pump body.

Background

The centrifugal slurry pump under the antiseptic solution is a common conveying device for lifting, sucking and conveying low-level tank slurry in the chemical smelting industry, and particularly has good antiseptic property and wear resistance when conveying corrosive slurry.

The prior art is that the centrifugal slurry pump under antiseptic solution is composed of pump case 1, pump cover 2, impeller 3, main shaft 4, middle pillar 5, mounting plate 6, motor 7 and other components (as shown in figure 1).

In order to achieve the performances of corrosion resistance and wear resistance, a pump shell, a pump cover and an impeller of the centrifugal slurry pump under the corrosion-resistant liquid are generally made of an ultrahigh molecular weight polyethylene (UHMWPE) material, and the material is corrosion-resistant and wear-resistant.

The connection mode of the pump shell and the pump cover in the prior art is generally divided into the following two types:

firstly, the pump cover and the pump shell are fixedly connected by metal bolts.

And in order to prevent the submerged part assembly from being corroded by the conveyed liquid, the pump shell is fixedly connected with the pump cover by adopting integral threaded connection, and the thread parts of the pump shell and the pump cover are both of plastic structures.

The first connection method has the disadvantages that if the conveying medium is corrosive, the metal bolt is easy to corrode, even the stainless steel bolt is easy to corrode, and the pump machine is damaged, and if the metal bolt is changed into the plastic bolt, although the corrosion problem can be overcome, the strength of the plastic bolt is difficult to meet the pressure sealing requirement due to the full action of the tension in the pump cavity and the bolt of the pump cover.

The disadvantage of using the second method for connection is that: 1. the thread between the pump cover and the pump shell is extruded and separated by liquid pressure due to high pressure of conveyed fluid, so that the thread fails, and particularly, when slurry with high temperature of 80-90 ℃ is conveyed, the pressure bearing capacity of the thread of the pump cover is reduced, so that thread sliding is separated, and the pump is damaged; 2. when slurry with more particles is conveyed by the pump under the anti-corrosion liquid, the slurry is squeezed into the screw between the pump cover and the pump shell under the action of the liquid pressure, so that the screw is blocked, and the slurry is difficult to detach, maintain and repair.

The above problems are to be further improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's not enough, provide a convenient dismantlement, joint strength is high, and the pump cover can not blocked by the sand grain, centrifugal slurry pump under the anticorrosive liquid that sealing performance is good between pump case, the pump cover.

For realizing the purpose of the utility model, the following technical proposal is provided: the utility model provides a centrifugal slurry pump under anticorrosive liquid, including the vertical pump body, the pump body include the pump case and with pump case sealing connection's pump cover, the terminal oral ring of its characterized in that pump case is provided with one-level location step, divide into two axial mounting holes of size with the oral ring, the pump cover includes apron and boss, the boss is inserted and is located in little axial mounting hole, the flange limit crimping of apron is in one-level location step surface, annular clamping groove has been seted up to big axial mounting hole inner wall, the inside callipers of annular clamping groove is equipped with the location snap ring, location snap ring axial is spacing, compress tightly the apron in one-level location step surface, the inboard of location snap ring is provided with the snap ring clamping ring, the snap ring clamping ring includes vertical portion and horizontal part, vertical portion will fix a position radial spacing compressing tightly in.

Preferably, the positioning clamping ring is of a split structure.

Preferably, the horizontal part and the end surface of the pump casing mouth ring are correspondingly provided with bolt holes and fixedly connected through bolts.

Preferably, the pump shell, the pump cover, the positioning snap ring and the snap ring pressing ring are all of plastic structures.

Preferably, the cover plate is provided with a sealing ring between the first-stage positioning steps.

Preferably, the material of the bolt is polyvinylidene fluoride, nylon or polypropylene.

The utility model discloses beneficial effect: the utility model discloses mainly pump case and the anticorrosive mounting structure of pump cover to submerged pump, through setting up the location snap ring, the snap ring clamping ring carries out axial and radial positioning to the pump cover, then utilize the plastics bolt to fix the snap ring clamping ring on the pump case, the tension of having overcome prior art metal bolted connection mode is concentrated on the problem of bolt entirely, make its axial tension shift the location snap ring from entirely, thereby use the plastics bolt can satisfy installation intensity, again because its connection structure does not use whole screw thread to connect soon, the pump cover is died and difficult dismantlement's shortcoming by the sand grain card among the prior art has been overcome, the maintenance installation is swiftly convenient.

Drawings

FIG. 1 is a schematic diagram of a prior art submerged centrifugal pump;

FIG. 2 is a schematic structural view of the submerged centrifugal pump of the present invention;

FIG. 3 is an enlarged view of a portion A of FIG. 2;

FIG. 4 is a cross-sectional view of the snap ring of FIG. 3 positioned as a split plate;

FIG. 5 is a left side view of FIG. 4;

FIG. 6 is a schematic structural view of a multi-column type intermediate support;

FIG. 7 is a schematic structural view of a steel-plastic composite intermediate bracket;

fig. 8 is a schematic view of a structure for mounting a shrouded impeller.

Detailed Description

Example 1: as shown in fig. 2 and 3, the anti-corrosive submerged centrifugal slurry pump comprises a vertical pump body, wherein the pump body comprises an impeller 3, a main shaft 4, a middle bracket 5, a mounting bottom plate 6, a bearing 7, a motor 8, a liquid outlet pipe 9, a pump shell 1 and a pump cover 2 hermetically connected with the pump shell 1, a mouth ring 1.3 at the tail end of the pump shell 1 is provided with a primary positioning step 1.1, the mouth ring is divided into a large axial mounting hole 1.4 and a small axial mounting hole 1.5, the pump cover 2 comprises a cover plate and a boss, the boss is inserted into the small axial mounting hole 1.5, the flange edge of the cover plate is pressed on the surface of the primary positioning step 1.1, the inner wall of the large axial mounting hole 1.4 is provided with an annular clamping groove 1.2, a positioning clamping ring 10 is clamped in the annular clamping groove 1.2, the positioning clamping ring 10 is axially limited, the cover plate is pressed on the surface of the primary positioning step 1.1, the inner side of the positioning ring, vertical portion 11.2 will fix a position the radial spacing of snap ring 10 and compress tightly in ring groove 1.2, and horizontal portion 11.2 corresponds with pump case choma 1.3 terminal surface and has seted up the bolt hole, through bolt 12 rigid coupling, and the apron is provided with sealing washer 13 between one-level location step 1.1, and bolt 12 is the plastics material. The structure form of the middle bracket is a single-column type 5.

Example 2: referring to embodiment 1, as shown in fig. 4 and 5, the remaining features are unchanged, and the positioning snap ring 10 is of a split structure, so that the installation and the disassembly are convenient.

Example 3: referring to example 1, as shown in fig. 6, the intermediate frame is constructed in the form of a multi-column 18. Generally, a small-sized anticorrosion submerged pump adopts a single-column type intermediate support, and a larger-sized anticorrosion submerged pump adopts a multi-column type intermediate support.

Example 4: referring to the embodiment 2, as shown in fig. 7, the structure form of the intermediate bracket can be a single-column steel-plastic composite structure, and the metal part of the intermediate bracket, which is in contact with liquid, is wrapped with an anticorrosive layer 19.1.

Example 5: referring to embodiment 1, as shown in fig. 8, the impeller is provided as a shrouded impeller.

The main shaft, the pump shell and the impeller of the anti-corrosion submerged centrifugal slurry pump in the embodiment are assembled according to a conventional submerged pump assembling method, and no obvious difference exists.

When the pump machine works in the above embodiment, the fluid pressure in the pump cavity is transmitted to the positioning snap ring 10 through the pump cover 2, and then the pressure is transmitted to the pump shell 1 through the positioning snap ring 10, and the snap ring pressing ring 11 and the bolt 12 do not bear the pressure generated by the fluid.

In order to improve the wear resistance of the anticorrosion submerged pump, the pump shell 1, the pump cover 2 and the impeller 3 are made of ultra-high molecular weight polyethylene with 500 ten thousand molecular weights.

In order to prevent the conveying medium from corroding the bolt of the submerged pump, the bolt is preferably made of materials with high temperature resistance and mechanical strength, such as polyvinylidene fluoride, nylon and polypropylene.

The form of the sealing ring 13 may be a flat gasket, and may also be an "O" ring, which is not limited in this technical scheme.

The snap ring 10 and the snap ring pressing ring 11 in the above embodiments are not corroded by scouring slurry, so that the snap ring and the snap ring pressing ring are only made of polypropylene, polyethylene and polyvinyl chloride materials with good processability and corrosion resistance, and have no special requirements.

The spindle sheath 15 described in the above embodiments is a plastic sleeve sleeved on the spindle, and is used to prevent the transported liquid from corroding the submerged pump spindle.

The filtering cover 17 in the above embodiment is a cover with a hole, which is sleeved on the pump cover, and the filtering cover is arranged to prevent solid and fibrous substances with large volume from entering the pump cavity and damaging the pump.

In the above embodiment, in order to improve the volumetric efficiency of the pump, it is preferable to provide the port ring 3.1 at the suction port of the impeller, and also provide the port ring 3.2 at one side of the back web of the impeller, where the port ring is provided to prevent the fluid with pressure in the pump cavity from flowing back to the suction port of the pump or leaking to the main shaft of the pump, so as to improve the volumetric efficiency.

Claims (6)

1. The utility model provides a centrifugal slurry pump under anticorrosive liquid, including the vertical pump body, the pump body include the pump case and with pump case sealing connection's pump cover, the terminal oral ring of its characterized in that pump case is provided with one-level location step, divide into two axial mounting holes of size with the oral ring, the pump cover includes apron and boss, the boss is inserted and is located in little axial mounting hole, the flange limit crimping of apron is in one-level location step surface, annular clamping groove has been seted up to big axial mounting hole inner wall, the inside callipers of annular clamping groove is equipped with the location snap ring, location snap ring axial is spacing, compress tightly the apron in one-level location step surface, the inboard of location snap ring is provided with the snap ring clamping ring, the snap ring clamping ring includes vertical portion and horizontal part, vertical portion will fix a position radial spacing compressing tightly in.

2. The slurry pump of claim 1, wherein the retaining snap ring is of a split construction.

3. The slurry pump according to claim 1, wherein the horizontal portion is provided with bolt holes corresponding to the end face of the pump casing mouth ring, and the horizontal portion is fixedly connected with the pump casing mouth ring through bolts.

4. The antiseptic submerged centrifugal slurry pump according to claim 1, characterized in that the pump casing, the pump cover, the positioning snap ring and the snap ring pressing ring are all plastic structures.

5. The slurry pump according to claim 1, wherein a seal ring is disposed between the first-stage positioning steps of the cover plate.

6. The antiseptic submerged centrifugal slurry pump according to claim 3, characterized in that the bolt material is polyvinylidene fluoride, nylon or polypropylene.

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