CN112555161A

CN112555161A - Self-suction type vertical centrifugal pump with long service life

Info

Publication number: CN112555161A
Application number: CN202011414944.5A
Authority: CN
Inventors: 朱海川; 殷晓华
Original assignee: Puchuan Fluid Equipment Wuxi Co Ltd
Current assignee: Puchuan Fluid Equipment Wuxi Co Ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-03-26
Anticipated expiration: 2040-12-03
Also published as: CN112555161B

Abstract

The invention discloses a self-priming vertical centrifugal pump with long service life, and relates to the field of vertical multistage centrifugal pumps; the centrifugal pump comprises a pump body and a pressure-resistant cylinder which are mutually communicated, wherein the pressure-resistant cylinder is arranged on the pump body, a rotating shaft is arranged in the pressure-resistant cylinder, one end of the rotating shaft is connected with the output end of a motor arranged on a pump cover, a pump cover and the upper part of the rotating shaft are provided with a mechanical seal, the mechanical seal seals a medium in the pump, the lower end of the rotating shaft is inserted in a shaft sleeve of the pump body and can rotate in the shaft sleeve, a plurality of impellers which are of hollow structures are distributed on the periphery of the rotating shaft and can rotate together with the rotating shaft, a water inlet is arranged in the center of each impeller, and a water outlet; a guide vane assembly is arranged outside each impeller; because the mechanical seal is positioned in the low-pressure area of the outlet of the impeller at the bottom, even if the vertical multi-stage centrifugal pump changes in stages, the pressure of the mechanical seal is still the pressure of the impeller at the bottom, and the service life of the mechanical seal is prolonged; and further the outlet reflux of the impeller is led into the inlet of the first-stage impeller, so that the self-priming pump can be formed.

Description

Self-suction type vertical centrifugal pump with long service life

Technical Field

The invention relates to the field of vertical multi-stage centrifugal pumps, in particular to a self-suction type vertical centrifugal pump with long service life.

Background

The vertical multi-stage centrifugal pump has compact integral structure, small volume, light weight, low noise, obvious energy-saving effect and convenient maintenance. The water inlet and the water outlet of the pump are positioned on the same horizontal line of the pump seat and can be directly used in a pipeline.

The working principle is that when the motor drives the impeller on the shaft to rotate at high speed, the liquid filled in the impeller is thrown to the periphery of the impeller from the center of the impeller along the flow channel between the blades under the action of centrifugal force, the pressure and the speed are increased simultaneously due to the action of the blades, and the liquid passes through the flow channel of the guide vane and is guided to the next-stage impeller, namely the principle that the liquid flows through all the impellers and the guide vane one by one, and the pressure energy of the liquid is further increased. After each impeller is overlapped step by step, a certain lift is obtained.

The higher the stage number of the vertical multi-stage centrifugal pump is, the higher the pump pressure is, the shorter the service life of the mechanical seal is, the service life of the mechanical seal is not uniform, and the current vertical multi-stage centrifugal pump is a non-self-priming pump and cannot well meet the self-priming requirement.

Disclosure of Invention

The invention aims to provide a self-suction type vertical centrifugal pump with long service life, which is used for solving the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a self-priming vertical centrifugal pump with long service life comprises a pump body and a pressure-resistant cylinder which are communicated with each other, wherein the pressure-resistant cylinder is arranged on the pump body and is internally provided with a rotating shaft, one end of the rotating shaft is connected with the output end of a motor arranged on a pump cover, the pump cover and the upper part of the rotating shaft are provided with a mechanical seal, the mechanical seal seals a medium in the pump, the lower end of the rotating shaft is inserted into a shaft sleeve of the pump body and can rotate in the shaft sleeve, a plurality of impellers which are hollow structures are distributed on the periphery of the rotating shaft and can rotate together with the rotating shaft, the centers of the plurality of impellers are provided with water inlets, and the periphery of the plurality; it is a plurality of the outside of impeller all is equipped with stator subassembly, stator subassembly is cut apart into outer passageway and the interior passageway that is used for the liquid circulation with impeller and pressure-resistant section of thick bamboo, seal department intercommunication on the pump cover at the top of outer passageway and interior passageway, also in the lower stator export intercommunication of bottom and pump body bottom, and the water conservancy diversion body of flow-guiding, the water conservancy diversion body import and the water conservancy diversion body export of water conservancy diversion body still communicate and still be connected with the piece from inhaling in it with the water inlet and the delivery port of the pump body respectively, still be equipped with the rotating part in the pressure-resistant section of thick bamboo, the rotating part comprises pivot and a plurality of impellers and last spacer sleeve, middle spacer sleeve and the lower spacer sleeve of locking the pivot by lock nut locking, goes up spacer sleeve, middle spacer sleeve and lower spacer sleeve and corresponds in last stator, middle stator and lower guide vane in the position that the.

As a further scheme of the invention: the stator subassembly includes stator, well stator and lower stator, it is located topmost to go up the stator, the stator is located outside the lowest impeller down, and it is equipped with the delivery port with impeller and outer passageway intercommunication, well stator is located between stator and the baffle, and it opens the runner that has higher level impeller export back to the impeller import of subordinate, go up stator, a plurality of well stator, baffle and lower stator and lean on the pump cover to press in pump case bottom fixed positioning.

As a further scheme of the invention: the flow guide body is positioned between the two adjacent impellers at the lowest position, and the flow guide body is respectively connected with the water outlets and the water inlets of the two adjacent impellers.

As a further scheme of the invention: the flow guide body inlet is communicated with the water inlet, and the flow guide body outlet is communicated with the water outlet.

As a further scheme of the invention: the self-suction piece is composed of a low self-suction guide blade and a low self-suction nozzle surrounded by the low self-suction guide blade and an impeller, the outlet of a flow guide opening of the low self-suction guide blade is connected with an outer channel and the low self-suction nozzle respectively, and the water outlet of the low self-suction nozzle is communicated with the water inlet of the impeller.

As a further scheme of the invention: the self-sucking piece is a guide body with a nozzle and the middle of the guide body is a non-self-sucking replacement guide body, and the guide body is formed by a sliding plug and a tension spring, wherein the sliding plug and the tension spring can be fixed on a rotating shaft, the sliding plug is connected with the tension spring, and the other end of the tension spring is fixed and limited in a groove between the middle spacer sleeve and the impeller.

As a still further scheme of the invention: from inhaling piece including extension spring, sliding plug and have the middle water conservancy diversion fluid nozzle of characteristic and take the middle water conservancy diversion body of nozzle, middle water conservancy diversion fluid nozzle just communicates two adjacent impeller runners through the pivot, middle water conservancy diversion fluid nozzle is the sliding plug 18A of closed position to the extreme closed position at spacing sliding plug.

Compared with the prior art, the invention has the beneficial effects that:

1. because the mechanical seal is positioned in the low-pressure area of the outlet of the bottom impeller in the process of pumping water, even if the vertical multi-stage centrifugal pump changes in stages, the pressure of the mechanical seal is still the pressure of the bottom impeller, and the service life of the mechanical seal is prolonged; the problem of among the prior art because vertical multistage centrifugal pump's progression is higher, pump pressure just is big more, thus leads to the machine to seal life-span just shorter and life-span is nonuniform is solved.

2. Through setting up from inhaling the piece, further introduce the first impeller import to impeller outlet backward flow, just can become the self priming pump again, can satisfy vertical centrifugal pump's height from inhaling, inhale from low and automatic demand from inhaling, solved most vertical multistage centrifugal pump and do not possess the problem from inhaling, increased holistic suitability.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of a self-priming device according to a first embodiment of the present invention.

Fig. 3 is a schematic structural view of a self-priming device according to a second embodiment of the present invention.

Fig. 4 is a schematic structural view of a self-priming device according to a third embodiment of the present invention.

Notations for reference numerals: the pump body 1, a pressure-resistant cylinder 2, a pump cover 3, a rotating shaft 4, a machine seal 5, an upper guide vane 6, a middle guide vane 7, a lower guide vane 8, an impeller 9, a flow guide body 10, a shaft sleeve 11, an isolation sleeve 12, a middle isolation sleeve 13, a lower isolation sleeve 14, a locking nut 15, a water inlet 16, a water outlet 17, a sliding plug 18A at a closed position, a tension spring 19, a low self-suction guide vane 81, a low self-suction nozzle 82, a flow guide body inlet 101, a flow guide body outlet 102, a middle flow guide body with nozzle 103 and a middle flow guide body nozzle 104.

Detailed Description

The present invention will be described in detail with reference to the following embodiments, wherein like or similar elements are designated by like reference numerals throughout the several views, and wherein the shape, thickness or height of the various elements may be expanded or reduced in practice. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention. Any obvious modifications or variations can be made to the present invention without departing from the spirit or scope of the present invention.

Referring to fig. 1, in the embodiment of the present invention, a self-priming vertical centrifugal pump with a long service life includes a pump body 1 and a pressure-resistant cylinder 2 which are communicated with each other, the pressure-resistant cylinder 2 is installed on the pump body 1 and a rotating shaft 4 is arranged therein, one end of the rotating shaft 4 is connected with an output end of a motor installed on a pump cover, a pump cover is provided with a mechanical seal 5 on the upper portion of the rotating shaft 4, the mechanical seal 5 seals a medium in the pump, the lower end of the rotating shaft 4 is inserted into a shaft sleeve 11 of the pump body 1 and can rotate in the shaft sleeve 11, a plurality of impellers 9 with a hollow structure are distributed on the periphery of the rotating shaft 4 and can rotate with the rotating shaft 4, water inlets are arranged in the centers of the plurality of impellers 9, and water outlets; the outer parts of the impellers 9 are provided with guide vane assemblies which divide the impellers 9 and the pressure cylinder 2 into an outer channel and an inner channel for liquid circulation, the top parts of the outer channel and the inner channel are communicated at the machine seal 5 on the pump cover 3, and are also communicated with the outlet of the lower guide vane 8 at the bottom part of the pump body 1, and flows through the flow guiding body 10, the flow guiding body inlet 101 and the flow guiding body outlet 102 of the flow guiding body 10 are also respectively communicated with the water inlet 16 and the water outlet 17 of the pump body 1 and are also connected with the self-sucking piece inside, still be equipped with the rotating part in the withstand voltage section of thick bamboo 2, the rotating part comprises pivot 4 and a plurality of impellers 9 and last spacer sleeve 12, middle spacer sleeve 13 and lower spacer sleeve 14 of locking in pivot 4 by lock nut 15, goes up spacer sleeve 12, middle spacer sleeve 13 and lower spacer sleeve 14 and corresponds in last stator 6, well stator 7 and lower stator 8 in the position of fixed impeller 9 respectively.

In the invention, the guide vane assembly comprises an upper guide vane 6, a middle guide vane 7 and a lower guide vane 8, the upper guide vane 6 is positioned at the topmost position, the lower guide vane 8 is positioned outside the impeller 9 at the lowest position and is provided with a water outlet for communicating the impeller 9 with an external channel, the middle guide vane 7 is positioned between the upper guide vane 6 and a flow guide body 10, a flow channel from the outlet of the upper-level impeller 9 to the inlet of the lower-level impeller 9 is formed in the middle guide vane 7, and the upper guide vane 6, a plurality of middle guide vanes 7, the flow guide body 10 and the lower guide vane 8 are fixedly positioned at the bottom of the pump shell by pressing the pump cover 3.

In the invention, the flow guide body 10 is positioned between two adjacent impellers 9 at the lowest position, and the flow guide body 10 is respectively connected with the water outlet and the water inlet of the two adjacent impellers 9.

In the present invention, the flow guide inlet 101 is communicated with the water inlet 16, and the flow guide outlet 102 is communicated with the water outlet 17.

The working principle is as follows: in the process that the motor drives the rotating shaft 4 to rotate, liquid flows from the water inlet 16 to the guide body inlet 101 along the direction indicated by an arrow in figure 1, then flows into the impeller 9 positioned at the lower part through the action of the guide body 10, then flows to the outer channel along the lower guide vane 8, the outer channel is in contact with the mechanical seal 5 and flows into the impeller 9 positioned at the top part along the guide action of the upper guide vane 6, then repeatedly passes through the middle guide vane 7 and the impeller 9 arranged on the middle guide body for multiple times, and finally flows to the guide body outlet 102 along the guide body 10, the fluid flows out of the pump body 1 through the water outlet 17 to finish the action of centrifugal pumping water, because the mechanical seal 5 is positioned at the connection part of the inner channel and the outer channel, the mechanical seal pressure is the pressure of the impeller 9 at the lowest end (first stage), and the mechanical seal pressure cannot be increased when the number of the impeller 9 is increased, so that the number of the impeller 9 can be ensured in, the mechanical seal 5 can be maintained in the service range of the maximum life.

The present invention is not limited to a specific structure of the self-priming device, and three embodiments are listed to achieve the overall functions of low self-priming, high self-priming and automatic self-priming.

The first scheme is as follows:

referring to fig. 2, in the embodiment of the present invention, the self-priming member is composed of a low self-priming guide vane 81, and a low self-priming nozzle 82 surrounded by the low self-priming guide vane 81 and the impeller 9, a flow guide outlet of the low self-priming guide vane 81 is respectively communicated with the outer channel and the low self-priming nozzle 82, and a water outlet of the low self-priming nozzle 82 is communicated with a water inlet of the impeller 9.

In the embodiment, the lower guide vane 8 is replaced by the low self-priming guide vane 81, a part of the liquid flowing out of the impeller 9 flows to the outer channel, and the other part of the liquid flows back to the impeller 9 from the low self-priming nozzle 82, so that the injection self-priming of the low self-priming nozzle 82 is realized, and the effect of the overall low self-priming is realized due to the low pressure of the first-stage backflow.

Scheme II:

referring to fig. 3, in the embodiment of the present invention, the self-priming device is a middle flow guiding body 103 with a nozzle, which replaces the non-self-priming flow guiding body 10, and is composed of a sliding plug 18 and a tension spring 19, which can slide and rotate on a middle isolation sleeve 13 fixed on the rotating shaft 4, the sliding plug 18 is connected with the tension spring 19, and the other end of the tension spring 19 is fixed and limited in a groove between the middle isolation sleeve 13 and the impeller 9.

In this embodiment, the liquid flowing out of the impeller 9 of the lowest middle guide vane 7 can be guided to the impeller 9 in the lower guide vane 8 along the middle guide body 103 with nozzle, so as to realize the injection self-priming of the nozzle in the center, and the self-priming capability is relatively high due to the high pressure of the liquid flowing back into the impeller 9, thereby realizing the function of overall high self-priming.

The third scheme is as follows:

referring to fig. 4, in the embodiment of the present invention, the self-priming member includes a tension spring 19, a sliding plug 18, a characteristic intermediate fluid nozzle 104 and an intermediate fluid with nozzle 103, the intermediate fluid nozzle 104 communicates with two adjacent impeller 9 flow channels through the rotating shaft 4, and the intermediate fluid nozzle 104 is a sliding plug 18A that limits the sliding plug 18 to a closed position of an extreme closed position.

In this embodiment, when the pump starts the self-priming, the liquid pressure from the impeller 9 connected to the lower guide vane 8 is low, the maximum distance is formed between the sliding plug 18 and the intermediate fluid guide nozzle 104, after the self-priming is completed, the pump pressure is increased to the maximum, the sliding plug 18 pushes the sliding plug 18 to the intermediate fluid guide nozzle 104 under the action of the pressure difference and the recoil, and is inserted into the intermediate fluid guide nozzle 104, as shown by the sliding plug 18A in the closed position in fig. 3, so as to close the intermediate fluid guide 103 with nozzle, and when the pressure is reduced and changed, the sliding plug 18 is gradually pulled out from the intermediate fluid guide nozzle 104 under the action of the tension spring 19 according to the pressure reduction change from the impeller 9 connected to the lower guide vane 8, so that the self-priming function is recovered, and the automatic self-priming function is realized.

In conclusion, the vertical multi-stage pump is realized by replacing or adding parts when the functions are changed, so that various functions are realized by utilizing the existing parts to the maximum extent and ensuring the reliability of the parts, and the modular design is realized.

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A self-priming vertical centrifugal pump with long service life comprises a pump body (1) and a pressure-resistant cylinder (2) which are communicated with each other, wherein the pressure-resistant cylinder (2) is installed on the pump body (1) and is internally provided with a rotating shaft (4), one end of the rotating shaft (4) is connected with an output end of a motor installed on a pump cover, a machine seal (5) is arranged on the upper parts of the pump cover and the rotating shaft (4), the machine seal (5) seals a medium in the pump, the lower end of the rotating shaft (4) is inserted into a shaft sleeve (11) of the pump body (1) and can rotate in the shaft sleeve (11), a plurality of impellers (9) which are of hollow structures are distributed on the periphery of the rotating shaft (4) and can rotate together with the rotating shaft (4), water inlets are formed in the centers of the plurality of impellers (9), and water outlets communicated with the inlets; the device is characterized in that guide vane assemblies are arranged outside the impellers (9), the guide vane assemblies divide the impellers (9) and the pressure-resistant cylinder (2) into outer channels and inner channels for liquid circulation, the tops of the outer channels and the inner channels are communicated at a machine seal (5) on the pump cover (3) and are also communicated with a lower guide vane (8) outlet at the bottom of the pump body (1) and flow through a guide body (10), a guide body inlet (101) and a guide body outlet (102) of the guide body (10) are respectively communicated with a water inlet (16) and a water outlet (17) of the pump body (1) and are also connected with a self-sucking part in the guide body inlet, the pressure-resistant cylinder (2) is also internally provided with a rotating part, and the rotating part is composed of the plurality of impellers (9) locked on the rotating shaft (4) by a rotating shaft (4) and an upper isolation sleeve (12), a middle isolation sleeve (13) and a lower isolation sleeve (14) by a locking nut (15), the upper isolation sleeve (12), the middle isolation sleeve (13) and the lower isolation sleeve (14) are used for fixing the position of the impeller (9) to correspond to the upper guide vane (6), the middle guide vane (7) and the lower guide vane (8).

2. The self-priming vertical centrifugal pump with long service life is characterized in that the guide vane assembly comprises an upper guide vane (6), a middle guide vane (7) and a lower guide vane (8), the upper guide vane (6) is positioned at the topmost position, the lower guide vane (8) is positioned outside a lowest impeller (9), a water outlet for communicating the impeller (9) with an outer channel is formed in the lower guide vane (8), the middle guide vane (7) is positioned between the upper guide vane (6) and a flow guide body (10), a flow channel for leading the upper impeller (9) to enter the lower impeller (9) after exiting is formed in the middle guide vane (7), and the upper guide vane (6), the plurality of middle guide vanes (7), the flow guide body (10) and the lower guide vane (8) are fixedly positioned at the bottom of the pump shell by pressing the pump cover (3).

3. The self-priming vertical centrifugal pump with long service life as claimed in claim 1, characterized in that the flow guide body (10) is located between the two lowest adjacent impellers (9), and the flow guide body (10) is respectively connected with the water outlet and the water inlet of the two adjacent impellers (9).

4. The self-priming vertical centrifugal pump with long service life of claim 3, wherein the baffle inlet (101) communicates with the water inlet (16) and the baffle outlet (102) communicates with the water outlet (17).

5. The self-priming vertical centrifugal pump with long service life is characterized in that the self-priming piece is composed of a low self-priming guide vane (81) and a low self-priming nozzle (82) surrounded by the low self-priming guide vane (81) and an impeller (9), the outlet of the flow guide opening of the low self-priming guide vane (81) is respectively connected with an outer channel and the low self-priming nozzle (82), and the water outlet of the low self-priming nozzle (82) is communicated with the water inlet of the impeller (9).

6. The self-priming vertical centrifugal pump with long service life as claimed in claim 1, characterized in that the self-priming part is a nozzle-equipped intermediate flow conductor (103) which replaces the non-self-priming flow conductor (10), and is composed of a sliding plug (18) and a tension spring (19) which can slide and rotate with an intermediate spacer sleeve (13) fixed on the rotating shaft (4), the sliding plug (18) and the tension spring (19) are connected, and the other end of the tension spring (19) is fixed and limited in a groove between the intermediate spacer sleeve (13) and the impeller (9).

7. The self-priming vertical centrifugal pump with long service life according to claim 1, characterized in that the self-priming piece comprises a tension spring (19), a sliding plug (18) and characterized intermediate flow guide nozzles (104) and a spouted intermediate flow guide (103), the intermediate flow guide nozzles (104) communicate with the flow channels of two adjacent impellers (9) through a rotating shaft (4), and the intermediate flow guide nozzles (104) limit the sliding plug (18) to the sliding plug (18A) of the closed position of the extreme closed position.