CN212155171U

CN212155171U - Submerged double-suction double-volute centrifugal pump

Info

Publication number: CN212155171U
Application number: CN202020884779.9U
Authority: CN
Inventors: 李瑞波; 张振水; 张建军
Original assignee: Jinan Sanke Pump Industry Co ltd
Current assignee: Jinan Sanke Pump Industry Co ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2020-12-15
Anticipated expiration: 2030-05-22

Abstract

The utility model provides a double suction double volute centrifugal pump under liquid relates to the submerged pump field, establish the stay tube outside the pump shaft including pump shaft and cover, sliding bearing on the gusset is fixed is passed through to stay tube one end, and the sliding bearing cooperation has the double suction pump body on the pump shaft end passes, and the double suction pump body lateral wall is connected with the drain pipe, and pump shaft upper portion is equipped with drive mechanism, and drive mechanism drives the double suction impeller work of the inside of the double suction pump body through the pump shaft under the power action for the liquid that will inhale the double suction impeller changes into high-pressure liquid, and discharges through the drain pipe. The pump body is arranged into an upper pump body, a middle pump body and a lower pump body, and the middle pump body is provided with a spiral double volute. The whole design is novel, the structure is compact, the processing and the manufacturing are convenient, the disassembly and the maintenance are convenient, and the manufacturing cost is low.

Description

Submerged double-suction double-volute centrifugal pump

Technical Field

The disclosure relates to the field of submerged pumps, in particular to a submerged double-suction double-volute centrifugal pump.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

Submerged pumps are a class that is widely used in pump applications. Submerged pumps are divided into single-tube type and double-tube type. Because the impeller of submerged pump soaks in the middle of liquid, need not evacuation or fill the diversion when the pump starts, as long as the impeller submerges in liquid, the start can, convenient to use is reliable.

The inventor finds that most impellers of the double-pipe submerged pump are of a single-stage single-suction single-volute structure, and the axial force and the radial force are large; the axial force generated by the submerged pump is borne by the rolling bearing of the transmission mechanism, and the radial force generated by the submerged pump is borne by the sliding bearing and the rolling bearing of the transmission mechanism, so that the failure rate of the rolling bearing and the sliding bearing of the single-stage single-suction submerged pump is high; in addition, the pump body structure of the submerged double-suction pump in the prior art is complex, the manufacturing cost is high, and the submerged double-suction pump is inconvenient to install and maintain.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the shortcoming that prior art exists, provides a double suction double volute centrifugal pump under liquid, sets up the pump body into the upper pump body, well pump body and lower pump body, exports the outside through the liquid in with well pump body pressurized-water chamber. The whole design is novel, the structure is compact, the processing and the manufacturing are convenient, the disassembly and the maintenance are convenient, and the manufacturing cost is low.

In order to realize the purpose, the following technical scheme is adopted:

an underwater double-suction double-volute centrifugal pump comprises a pump shaft, wherein a transmission mechanism is arranged at the upper part of the pump shaft, a supporting pipe is sleeved outside the pump shaft and is fixed with an upper sliding bearing through a rib plate, the lower part of the pump shaft penetrates through the upper sliding bearing and is matched with a double-suction pump body, the top of the double-suction pump body is connected with the supporting pipe, the side wall of the double-suction pump body is connected with a liquid outlet pipe, and the liquid outlet pipe is positioned on the outer side of the supporting pipe and is; the transmission mechanism drives the double-suction impeller in the double-suction pump body to work through the pump shaft under the action of power, and is used for converting liquid sucked into the double-suction impeller into high-pressure liquid and discharging the high-pressure liquid through the liquid outlet pipe.

Furthermore, the double-suction pump body comprises an upper pump body, a middle pump body and a lower pump body which are sequentially connected, a rib plate is arranged in the lower pump body, and a rib plate is arranged on the outer wall of the upper pump body.

Further, the middle pump body adopts a double-volute structure.

Furthermore, the transmission mechanism and the supporting tube are coaxially arranged, the side wall of the middle pump body is connected with the liquid outlet pipe, and the liquid outlet pipe is used for receiving liquid discharged by the middle pump body and outputting the liquid to the outside.

Furthermore, the liquid outlet pipe is detachably connected with the shell of the middle pump body through a connecting piece; the liquid outlet pipe is vertically arranged.

Furthermore, the double-suction pump body is internally provided with a cavity, the pump shaft penetrates through the cavity, the upper part of the cavity is provided with a first liquid inlet at intervals along the radial direction of the pump shaft, the bottom of the cavity is provided with a second liquid inlet, and the cavity is used for receiving liquid entering from the first liquid inlet and the second liquid inlet and outputting the liquid converted into high pressure through a liquid outlet pipe.

Further, first inlet include the bar groove of a plurality of intercommunication cavities, evenly arrange for the pump shaft hoop, the second inlet be reducing channel, form loudspeaker column structure, the second inlet sets up along the pump shaft axial.

Compared with the prior art, the utility model has the advantages and positive effects that:

(1) the middle pump body adopts a double-volute structure, and no matter the pump runs at a design point or deviates from the design point, theoretically, the radial force generated by the water pumping chamber is zero, and the effect of prolonging the service life of a sliding bearing and a rolling bearing of a transmission mechanism is achieved.

(2) The whole design of the submerged double-suction pump is novel, the upper part, the middle part and the lower part of the pump body are connected to form a double-suction pump body, the structure is compact, the processing and the manufacture are convenient, and the disassembly and the maintenance are more convenient.

(3) Go up the pump body middle part and be equipped with first inlet, the lower pump body is equipped with the second inlet, and the liquid velocity of flow at double suction impeller both ends is close to guaranteed the feed liquor effect at impeller both ends, the impeller atress is even, and impeller both ends axial force equals, but opposite direction, and the axial force that acts on the impeller is zero in theory. The rolling bearing of the transmission mechanism only bears the weight of the rotor, so that the whole machine can run more stably, and meanwhile, the service life of the rolling bearing is prolonged.

(4) The utility model adopts an external connection mode by connecting the liquid outlet pipe with the middle pump body pumping chamber, namely the liquid outlet pipe is positioned at one side of the supporting pipe and is not communicated with the supporting pipe, and the liquid in the middle pump body pumping chamber is output to the outside, so that the liquid in the supporting pipe is at normal pressure; the conveyed medium does not contact with the filler for sealing the whole machine, and the mode has good sealing effect, high efficiency and no leakage.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.

Fig. 1 is a schematic view of the overall structure of a submerged double suction double volute centrifugal pump in embodiment 1 of the present disclosure;

fig. 2 is a schematic structural diagram of the double-suction pump body and the liquid outlet pipe in the embodiment 1 of the present disclosure.

In the figure, the pump comprises a pump shaft 1, a pump shaft 2, a support pipe 3, an upper pump body 4, a set screw 5, a sealing ring 6, a key 7, a retaining sleeve 8, a lower shaft sleeve 9, a lower sliding bearing 10, a liquid outlet pipe 11, an upper sliding bearing 12, an upper shaft sleeve 13, a middle pump body 14, an impeller 15, a lower pump body 16, a key 17, a round nut 18, a first liquid inlet 19, a second liquid inlet 20 and a transmission mechanism.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "up", "down", "left" and "right" in this disclosure, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present disclosure.

As described in the background art, the pump body of the submerged double suction pump in the prior art has a complicated structure, is relatively expensive to manufacture, and is inconvenient to install and maintain. In view of the above, the present disclosure provides a submerged double suction pump.

Example 1

In a typical embodiment of the present disclosure, as shown in fig. 1-2, a submerged double suction twin-volute centrifugal pump is proposed; the double-suction pump mainly comprises a transmission mechanism 20, a double-suction pump body, a pump shaft 1 and a supporting tube 2, wherein the motor drives the pump shaft to rotate through the transmission mechanism, the pump shaft is matched with an impeller in the double-suction pump body, the motor drives the impeller to work through the pump shaft, the supporting tube 2 is sleeved outside the pump shaft 1, the upper end of the supporting tube is connected with the transmission mechanism 20, the lower end of the supporting tube is connected with the double-suction pump body, the double-suction pump body is fixed on an upper sliding bearing 11 through a rib plate, the tail end of the pump shaft penetrates through the upper sliding bearing 11 to be matched with the double-suction pump body, the side wall of the double-suction pump body is connected with a liquid outlet pipe 10, the upper part of the pump shaft is provided with the transmission mechanism.

For the pump shaft and the supporting tube, in the embodiment, the supporting tube is sleeved outside the pump shaft, the upper end of the supporting tube is connected with the transmission mechanism, and the lower end of the supporting tube is connected with the double-suction pump body, so that the fixing effect on the double-suction pump body can be realized;

for the double-suction pump body, in the embodiment, the double-suction pump body comprises an upper pump body 3, a middle pump body 13 and a lower pump body 15 which are connected in sequence, a cavity is formed jointly, a pump shaft is matched with an upper shaft sleeve through a set screw 4, the pump shaft is matched with a support tube through an upper shaft sleeve 12 and a sliding bearing 11, a key groove is arranged on the pump shaft, a key 6 is matched in the key groove, at the position, an impeller 14 and the pump shaft realize matched transmission, the position of the impeller on the pump shaft is restrained through a retaining sleeve 7 and a lower shaft sleeve 8 and two round nuts, the pump shaft is matched with a lower shaft sleeve through a key 16, and a lower sliding bearing 9 is fixed on; the tail end of the pump shaft is matched with the lower sliding bearing through a lower shaft sleeve;

the upper pump body 3 is fixed at the lower end of the supporting tube, the middle pump body is fixed on the upper pump body, the lower pump body is fixed on the middle pump body, the liquid outlet pipe 10 is arranged on the outer side of the cavity, the liquid outlet pipe 10 is vertically arranged and is perpendicular to the middle pump body, and therefore liquid in the cavity can be turned. That is, the liquid outlet pipe in this embodiment is located at one side of the supporting pipe and is not communicated with the supporting pipe. The middle pump body 13 adopts a double-volute structure, and no matter the pump runs at a design point or deviates from the design point, theoretically, the radial force generated by the pumping chamber is zero, and the effect of prolonging the service life of a sliding bearing and a rolling bearing of a transmission mechanism is achieved.

The pump shaft sequentially penetrates through the upper sliding bearing 11, the upper pump body 3, the middle pump body 13 and the lower pump body 15, and a sealing ring 5 is arranged at the position where the pump shaft is in running fit with other elements;

the upper sliding bearing 11 and the lower sliding bearing 9 play a role in radial support, so that the transmission stability of the pump shaft can be improved, and the stable operation of the equipment is ensured.

It should be noted that the cavity is provided with a first liquid inlet 18 and a second liquid inlet 19 at intervals along the radial direction of the pump shaft, and the cavity receives liquid entering from the first liquid inlet 18 and the second liquid inlet 19 and outputs the liquid through the liquid outlet pipe; the impeller is positioned between the first liquid inlet 18 and the second liquid inlet 19;

the liquid inlets are respectively arranged above and below the impeller, and liquid is conveyed into the cavity corresponding to the impeller simultaneously, so that the axial force generated by the liquid inlets on the two sides to the impeller can be completely offset, the axial load of the rolling bearing is reduced, the abrasion is reduced, and the service life is prolonged.

In this embodiment, the cavity structure is a structure formed by two horn-shaped water suction chambers in butt joint, a part corresponding to the middle pump body is a pumping chamber, and the pumping chamber is of a double-volute spiral structure; the impeller is a double-suction impeller which is fixed at the lower end of the pump shaft through a round nut 17; and the hydraulic efficiency is improved by matching with the double-suction impeller.

It can be understood that, in order to improve the strength of the double suction pump body, the outer portion of the upper pump body is provided with a plurality of rib plates.

The transmission mechanism has the function of transmitting the power of the motor to the pump shaft, and drives the impeller to rotate through the pump shaft to apply work to the liquid, so that energy conversion is realized, and the liquid is discharged outwards.

It is particularly pointed out that the liquid outlet pipe is detachably connected with the middle pump body of the double-suction pump body through a bolt.

The utility model adopts an external connection mode by connecting the liquid outlet pipe with the middle pump body pumping chamber, namely the liquid outlet pipe is positioned at one side of the supporting pipe and is not communicated with the supporting pipe, and the liquid in the middle pump body pumping chamber is output to the outside, so that the liquid in the supporting pipe is at normal pressure; the conveyed medium does not contact with the filler for sealing the whole machine, and the mode has good sealing effect, high efficiency and no leakage.

In addition, in other embodiments, a cooling cavity may be disposed on the double-suction pump, and when pumping high-temperature media, such as high-temperature molten nitrate salt, fluoride salt, or heat transfer oil, the cooling cavity of the transmission mechanism is connected with external cooling water, so as to transfer working heat in time, so that the rolling bearing and the motor in the transmission mechanism can operate at safe temperature, and ensure safe and reliable operation of the equipment.

The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. The utility model provides an under liquid double suction double volute centrifugal pump, includes the pump shaft, and pump shaft upper portion is equipped with drive mechanism, its characterized in that establishes the stay tube at the pump shaft overcoat, and the stay tube passes through the fixed upper sliding bearing of gusset, and the pump shaft lower part is passed the upper sliding bearing cooperation and is had the double suction pump body, and double suction pump body top links to each other with the stay tube, and double suction pump body lateral wall is connected with the drain pipe, the drain pipe be located the outside of stay tube.

2. The centrifugal pump of claim 1, wherein the double-suction pump body comprises an upper pump body, a middle pump body and a lower pump body which are connected in sequence, the upper pump body and the middle pump body are detachably connected through a connecting piece, and the middle pump body and the lower pump body are detachably connected through a connecting piece.

3. The centrifugal pump according to claim 2, wherein the lower pump body has ribs formed therein, and the upper pump body has ribs formed on an outer wall thereof.

4. The centrifugal pump according to claim 2, wherein said intermediate pump body is of spiral double volute construction.

5. The centrifugal pump according to claim 2, wherein said transmission mechanism is disposed coaxially with said support tube, and said discharge tube is connected to a side wall of said middle pump body.

6. The centrifugal pump of claim 2, wherein the outlet pipe is detachably connected to the casing of the middle pump body through a connector; the liquid outlet pipe is vertically arranged.

7. The centrifugal pump as claimed in claim 1, wherein the double-suction pump body has a cavity therein, the pump shaft passes through the cavity, a first inlet is disposed at an upper portion of the cavity at a distance from the pump shaft, a second inlet is disposed at a bottom of the cavity, and the cavity is adapted to receive the liquid from the first inlet and the second inlet and output the liquid converted into high pressure through the outlet pipe.

8. The centrifugal pump according to claim 7, wherein said first inlet comprises a plurality of grooves communicating with said cavity.

9. The centrifugal pump according to claim 8, wherein said first inlet ports are circumferentially and uniformly arranged with respect to said pump shaft.

10. The centrifugal pump of claim 7, wherein the second inlet is a variable diameter channel forming a trumpet-shaped structure, and the second inlet is axially disposed along the pump shaft.