CN212389534U - Balanced type multistage self-priming centrifugal pump - Google Patents

Abstract

The utility model discloses a balanced type multistage self-priming centrifugal pump, the both ends of pump shaft support between front bearing frame and rear bearing frame through front bearing and rear bearing respectively, the front bearing frame is fixed to be installed on the suction section, the rear bearing frame is fixed to be installed on the discharge section, the pump shaft is sleeved with bearing retainer ring, front axle sleeve, intermediate sleeve, primary impeller, secondary impeller, mechanical seal axle sleeve and rear axle sleeve; the first-stage impeller is matched with the suction section, the guide vane is arranged outside the first-stage impeller and arranged inside the middle section, the suction section is provided with a breather valve, the discharge section is provided with an exhaust valve, and a backflow hole is formed below the last-stage guide vane. The self-priming centrifugal pump is improved on the basis of the existing balance type multistage centrifugal pump, so that the pump completes the air discharging process through self priming and then normally works under the condition of no bottom valve or vacuum pumping device.

Description

Balanced type multistage self-priming centrifugal pump

Technical Field

The utility model relates to a centrifugal pump field, in particular to balanced type is multistage from inhaling centrifugal pump.

Background

The existing balance type multistage centrifugal pump is a sectional multistage centrifugal pump with a single suction inlet or a double suction inlet, and a suction inlet of the pump can be vertically upward or horizontally and a discharge outlet of the pump can be vertically upward. Mainly comprises the following steps: suction section, middle section, spit section, stator, impeller, axle, mechanical seal, bearing, front bearing seat etc. and part constitution, this kind of multistage centrifugal pump generally is equipped with bottom valve or evacuating device to exhaust the air of suction line before starting, its main shortcoming is:

1. the bottom valve is arranged, so that certain resistance loss can be generated, and the efficiency of the pump set is reduced; if the bottom valve leaks, priming is required before each start.

2. When the vacuum pumping device is installed, the vacuum pumping device needs to be started before each start, so that the energy consumption is increased.

SUMMERY OF THE UTILITY MODEL

The main object of the utility model is to provide a balanced type is multistage from inhaling centrifugal pump, this from inhaling centrifugal pump improves on current balanced type multistage centrifugal pump basis to realize under the condition that does not have bottom valve or evacuating device, the pump is through accomplishing the process of discharging air and then normally working from inhaling.

In order to realize the technical characteristics, the purpose of the utility model is realized as follows: a balanced type multistage self-priming centrifugal pump comprises a pump shaft, wherein two ends of the pump shaft are respectively supported between a front bearing seat and a rear bearing seat through a front bearing and a rear bearing, the front bearing seat is fixedly arranged on a suction section, the rear bearing seat is fixedly arranged on a discharge section, and a bearing retainer ring, a front shaft sleeve, a middle sleeve, a primary impeller, a secondary impeller, a mechanical seal shaft sleeve and a rear shaft sleeve are sleeved on the pump shaft; the first-stage impeller is matched with the suction section, the guide vane is arranged outside the first-stage impeller and arranged inside the middle section, the suction section is provided with a vent valve, the discharge section is provided with an exhaust valve, and a backflow hole is formed below the last-stage guide vane.

The head of the pump shaft is provided with a pump coupling in a matching way through a flat key; when the pump is used, the pump coupler is connected with an output shaft of the motor through a flange and transmits torque.

The front bearing is positioned and installed inside the front bearing seat through a front bearing end cover and a bearing retainer ring, and the front bearing is a needle bearing.

The rear bearings are arranged in a parallel back-to-back mode, and the number of the rear bearings is two; the rear bearing is positioned and installed on a rear bearing seat through a rear bearing end cover, a rear shaft sleeve and a round nut, and the rear bearing is an angular contact bearing.

A primary sealing ring is arranged between the suction section and the primary impeller, and a front mechanical seal is positioned and installed between the suction section and the front shaft sleeve through a front mechanical seal cover.

The secondary impeller is externally provided with a guide vane and a middle section, the guide vane is provided with a guide vane sleeve, the middle section is provided with a secondary sealing ring, the last stage impeller is externally provided with a last stage guide vane and a discharge section, and a rear mechanical seal gland assembly are arranged between the discharge section and the mechanical seal shaft sleeve.

And the inlet of the suction section and the outlet of the discharge section are both vertically and upwards arranged.

The vent valve is arranged on a flange of the suction section or the highest point of the suction pipeline.

The utility model discloses there is following beneficial effect:

the utility model discloses a set up the backward flow hole in last stator lower part, set up discharge valve and breather valve on spitting out the section and inhaling the section flange, make the pump package system under the condition that does not have bottom valve or evacuating device, accomplish from inhaling process and normal work, it is more energy-conserving than ordinary balanced type multistage centrifugal pump, improved the efficiency of pump package, increased economic benefits.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic view of the overall structure of the present invention.

In the figure: the pump comprises a pump coupling 1, a pump shaft 2, a front bearing end cover 3, a front bearing 4, a front bearing seat 5, a bearing retainer ring 6, a front mechanical seal cover 8 of a front shaft sleeve 7, a front mechanical seal 9, an intake section 10, a middle sleeve 11, a first-stage seal ring 12, a first-stage impeller 13, a guide vane 14, a middle section 15, a secondary seal ring 16, a secondary impeller 17, a guide vane sleeve 18, a last-stage guide vane 19, a discharge section 20, a mechanical seal shaft sleeve 21, a rear mechanical seal 22, a rear mechanical seal cover assembly 23, a rear shaft sleeve 24, a rear bearing seat 25, a rear bearing 26, a rear bearing end cover 27, a vent valve 28, an exhaust valve 29 and a backflow hole.

Detailed Description

The following describes embodiments of the present invention with reference to the accompanying drawings.

Example 1:

as shown in fig. 1, a balanced multi-stage self-priming centrifugal pump includes a pump shaft 2, two ends of the pump shaft 2 are respectively supported between a front bearing seat 5 and a rear bearing seat 25 through a front bearing 4 and a rear bearing 26, the front bearing seat 5 is fixedly installed on an intake section 10, the rear bearing seat 25 is fixedly installed on a discharge section 20, and a bearing retainer ring 6, a front shaft sleeve 7, a middle sleeve 11, a first-stage impeller 13, a secondary impeller 17, a mechanical seal shaft sleeve 21 and a rear shaft sleeve 24 are sleeved on the pump shaft 2; first-stage impeller 13 cooperatees with suction section 10, first-stage impeller 13's outside is provided with stator 14, stator 14 sets up inside middle section 15, install breather valve 28 on suction section 10, install discharge valve 29 on the section 20 of spitting, be provided with backward flow hole 30 below last-stage stator 19. The balance type multistage self-priming centrifugal pump adopting the structure is provided with the backflow hole at the lower part of the last stage guide vane, and the exhaust valve and the vent valve are arranged on the flanges of the discharge section and the suction section, so that the pump set system can realize the self-priming function of the pump under the condition without a bottom valve or a vacuumizing device, the self-priming process is completed, the normal work is realized, and the efficiency and the use economic benefit of the pump are improved.

Further, the head of the pump shaft 2 is provided with a pump coupling 1 in a matching way through a flat key; when the pump coupling is used, the pump coupling 1 is connected with an output shaft of the motor through a flange and transmits torque. Through adopting foretell pump shaft coupling 1 can be used for providing the power of pump shaft 2 work, and then the normal work of driving pump, in the course of the work, drive shaft coupling 1 through the motor to drive pump shaft 2 through shaft coupling 1, finally drive corresponding impeller through pump shaft 2 and rotate.

Further, the front bearing 4 is positioned and installed inside the front bearing seat 5 through the front bearing end cover 3 and the bearing retainer 6, and the front bearing 4 is a needle bearing. By adopting the above-described bearing mounting structure, the pump shaft 2 can be effectively supported.

Further, the rear bearings 26 are arranged in parallel back-to-back, and two groups are provided; the rear bearing 26 is an angular contact bearing and is positioned and mounted on the rear bearing seat 25 through a rear bearing end cover 27, a rear shaft sleeve 24 and a round nut. The rear bearing 26 can bear a certain axial force, and further, the axial pressure generated by the impeller in the pump is balanced.

Further, a primary sealing ring 12 is arranged between the suction section 10 and the primary impeller 13, and a front mechanical seal 9 is positioned and installed between the suction section 10 and the front shaft sleeve 7 through a front mechanical seal cover 8. The suction section 10 can be sealed well by the front mechanical seal 9.

Further, a guide vane 14 and a middle section 15 are arranged outside the secondary impeller 17, a guide vane sleeve 18 is arranged on the guide vane 14, a secondary sealing ring 16 is arranged on the middle section 15, a final-stage guide vane 19 and a discharge section 20 are arranged outside the last-stage impeller, and a rear mechanical seal 22 and a rear mechanical seal cover assembly 23 are arranged between the discharge section 20 and a mechanical seal shaft sleeve 21. A good sealing effect is achieved by the rear mechanical seal 22 described above.

Further, the inlet of the suction section 10 and the outlet of the discharge section 20 are both vertically arranged upward, so as to ensure that enough working fluid can be stored before the first start.

Further, the vent valve 28 is disposed at the flange of the suction segment 10 or at the highest point of the suction line. So as to prevent the medium in the pump from losing due to the siphon action when the pump stops working.

Further, a return hole is provided below the last stage guide vane for returning the working medium to the outlet of the last stage impeller.

Furthermore, an exhaust valve is arranged on the flange of the discharge section to exhaust air.

Example 2:

a method for using a balanced type multistage self-priming centrifugal pump comprises the following steps:

the method comprises the following steps: before the pump is used for the first time, the pump is filled with conveying liquid, after the pump is started, the liquid in the pump is discharged to a gas-liquid separation chamber of a discharge section 20 outside a final stage guide vane 19 due to the rotation of an impeller, vacuum is generated at the front end of an inlet of the final stage impeller, and air in a water inlet pipeline is sucked into the pump and reaches an outlet of the final stage impeller through an impeller flow channel;

step two: the gas-liquid mixture discharged under the rotation of the impeller flows to the gas-liquid separation chamber through the final stage guide vane 19; air is discharged out of the gas-liquid separation chamber through an exhaust valve 29, and liquid is conveyed to flow back to the outlet of the last-stage impeller from a return hole 30 of a liquid storage chamber at the lower part of the gas-liquid separation chamber, is mixed with air at the outlet of the last-stage impeller, and is discharged to the gas-liquid separation chamber of the discharge section 20 through a last-stage guide vane;

step three: repeating the steps until all the air in the suction pipeline is sucked, and starting normal pumping by changing the self-suction process into the pumping process of the pump;

step four: when the pump stops, the vent valve 28 on the intake section 10 is opened to allow air to enter the intake line to prevent liquid in the pump from being lost due to siphoning, and then the vent valve 28 is closed.

Claims (8)

1. A balanced type multistage self-priming centrifugal pump comprises a pump shaft (2), wherein two ends of the pump shaft (2) are supported between a front bearing seat (5) and a rear bearing seat (25) through a front bearing (4) and a rear bearing (26), the front bearing seat (5) is fixedly arranged on a suction section (10), the rear bearing seat (25) is fixedly arranged on a discharge section (20), and a bearing retainer ring (6), a front shaft sleeve (7), a middle sleeve (11), a first-stage impeller (13), a secondary impeller (17), a mechanical seal shaft sleeve (21) and a rear shaft sleeve (24) are sleeved on the pump shaft (2); first-stage impeller (13) and suction section (10) cooperate, the outside of first-stage impeller (13) is provided with stator (14), stator (14) set up inside middle section (15), its characterized in that: the suction section (10) is provided with a vent valve (28), the discharge section (20) is provided with an exhaust valve (29), and a return hole (30) is arranged below the final stage guide vane (19).

2. A balanced multi-stage self-priming centrifugal pump according to claim 1, characterized in that: the head of the pump shaft (2) is provided with a pump coupling (1) in a matching way through a flat key; when the pump coupling is used, the pump coupling (1) is connected with an output shaft of the motor through a flange and transmits torque.

3. A balanced multi-stage self-priming centrifugal pump according to claim 1, characterized in that: the front bearing (4) is positioned and installed inside the front bearing seat (5) through a front bearing end cover (3) and a bearing retainer ring (6), and the front bearing (4) adopts a needle roller bearing.

4. A balanced multi-stage self-priming centrifugal pump according to claim 1, characterized in that: the rear bearings (26) adopt a parallel back-to-back arrangement mode, and the two groups are provided in total; the rear bearing is positioned and installed on a rear bearing seat (25) through a rear bearing end cover (27), a rear shaft sleeve (24) and a round nut, and the rear bearing (26) adopts an angular contact bearing.

5. A balanced multi-stage self-priming centrifugal pump according to claim 1, characterized in that: be provided with primary seal ring (12) between suction segment (10) and primary impeller (13), mechanical seal (9) before installing through preceding machine gland lid (8) location between suction segment (10) and preceding axle sleeve (7).

6. A balanced multi-stage self-priming centrifugal pump according to claim 1, characterized in that: the secondary impeller (17) is provided with guide vane (14) and middle section (15) outward, is equipped with guide vane cover (18) on guide vane (14), is equipped with secondary sealing ring (16) on middle section (15), and last stage impeller is equipped with last stage guide vane (19) and spits section (20) outward, spits section (20) and is equipped with back mechanical seal (22) and back machine between seal axle sleeve (21) and seals gland subassembly (23).

7. A balanced multi-stage self-priming centrifugal pump according to claim 1, characterized in that: the inlet of the suction section (10) and the outlet of the discharge section (20) are both vertically arranged upwards.

8. A balanced multi-stage self-priming centrifugal pump according to claim 1, characterized in that: the breather valve (28) is arranged at the flange of the suction section (10) or at the highest point of the suction line.

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