CN201241854Y

CN201241854Y - Single-suction multilevel vertical centrifugal condensation pump

Info

Publication number: CN201241854Y
Application number: CNU200820054191XU
Authority: CN
Inventors: 周寿云
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-08-21
Filing date: 2008-08-21
Publication date: 2009-05-20
Anticipated expiration: 2018-08-21

Abstract

The utility model relates to a single-suction multi-stage vertical centrifugal condenser pump for transporting condensation water or similar media, which comprises a pump shaft, an anti-thrust bearing and an impeller, wherein a balancing system is arranged on the pump shaft between an anti-thrust bearing 21 and a last stage impeller 14. The balancing system comprises a balancing drum 5, a balancing sleeve 6 and a sealing body 7, wherein the balancing drum 5 is a cylinder with a central shaft hole, and is mounted on the pump shaft between the anti-thrust bearing and the last stage impeller, a radial gap is formed between the external surface of the balancing drum and the internal surface of the balancing sleeve, the balancing sleeve 6 is fixed on a balancing seat 22 of a motor supporting stand, the sealing body 7 is arranged between the anti-thrust bearing and the balancing drum, and the sealing body is fixed on the balancing seat. The pump shaft is formed by an upper pump shaft, a middle pump shaft and a lower pump shaft which are respectively connected with a coupler. The single-suction multi-stage vertical centrifugal condenser pump overcomes the shortcomings that axial force of an existing multi-stage vertical centrifugal condenser pump is independently borne by a motor, which lowers the axial bearing load of the motor, and has convenient disassembly and assembly and long service span.

Description

The multistage vertical centrifugal condensate extractionpump of a kind of single suction

Technical field

The utility model relates to a kind of centrifugal pump that is used for carrying condensed water or similar mediums, is exactly a kind of multistage vertical centrifugal condensate extractionpump specifically.

Background technique

Present multistage vertical centrifugal condensate extractionpump on the market, pump is connected with rigid coupling with motor, and during work, the weight of pump own and the axial force of generation are all born by motor, cause motor because thrust load is excessive, and electrical machmary maintenance is frequent, and electrical machinery life reduces.

The model utility content

The purpose of this utility model is intended to overcome the deficiency of existing multistage vertical centrifugal condensate extractionpump, provide a kind of can effectively improve motor shaft to the good stability of load distribution, install easily, the multistage vertical centrifugal condensate extractionpump of single suction of long service life.

For reaching above-mentioned purpose, the utility model has adopted following technological scheme: the multistage vertical centrifugal condensate extractionpump of described a kind of single suction, comprise pump shaft, thrust bearing and impeller, and on the pump shaft between thrust bearing and the impeller, be provided with balance sysmte.Balance sysmte is made up of balancing drum, balance set, seal, balancing drum is a cylindrical body that has central shaft hole, be contained on the pump shaft between thrust bearing and the impeller, the internal circular surfaces of balancing drum outer round surface and balance set forms radial clearance, balance set is fixed on the balance seat of electric machine support, be provided with seal between thrust bearing and balancing drum, seal is fixed on the balance seat.

In addition, pump shaft can also be by last pump shaft, middle pump shaft, pump shaft be formed down, is connected by coupling between following pump shaft, middle pump shaft and the last pump shaft, and last pump shaft is connected with motor shaft by coupling.

In the utility model, install balance sysmte behind the impeller additional, balancing drum outer round surface and balance set form radial clearance, the balancing drum front is the zone of high pressure of impeller, the back is the balance cylinder that seal is connected with the low pressure suction port and forms, and the differential pressure action between the two sides forms the equilibrant that points to the low pressure direction at balancing drum like this, this power is used for the balance major part and acts on the weight of epitrochanterian axial force and pump rotor parts, and remaining axial force is born by the thrust bearing that is provided with.The utility model has solved the drawback that the axial force of existing multistage vertical centrifugal condensate extractionpump is born separately by motor, reduced the axial carrying load of motor, the operating life of motor prolongs, and when necessary electromotor, needn't select the motor of the high energy bearing axial pushing force of valency for use, reduce the support expense of unit equipment.

In addition, pump shaft is divided into pump shaft, middle pump shaft, descends three sections of pump shafts, connect by coupling each other.Three kinds of pump shafts are born the transmission of being connected between pump and the motor, work loads respectively, overcome original multistage vertical centrifugal condensate extractionpump and born whole load with a major axis, the bearing load of single pump shaft reduces, descend to the working life of pump shaft, the easy bending deflection of major axis, the degree of disturbing of axle and vibration increase, and installation workload is big, the common fault of dismounting difficulty.

Description of drawings

Fig. 1 is pump structure figure of the present utility model.

Embodiment

As shown in Figure 1, the multistage vertical centrifugal condensate extractionpump of a kind of single suction mainly is made up of electric machine support 1, pump seat 2, bearing support 3, thrust collar 4, cylindrical shell 9, water exit end 10, inlet segment 11, stage casing 12, stator 13, impeller 14, pump shaft, horn mouth 18, following runner 19, pull bar 20, thrust bearing 21.On the pump shaft between thrust bearing 21 and the impeller 14, be provided with balance sysmte.Balance sysmte is made up of balancing drum 5, balance set 6, seal 7, balancing drum 5 is cylindrical bodys that have central shaft hole, be contained on the pump shaft between thrust bearing 21 and the impeller 14, rotate with pump rotor, the internal circular surfaces of balancing drum 5 outer round surface and balance set 6 forms radial clearance, balance set 6 is fixed on the balance seat 22 of electric machine support, is provided with seal 7 between thrust bearing 21 and balancing drum 5, and seal 7 is fixed on the balance seat 22.Balancing drum 5 fronts are zone of high pressure of impeller 14, the back is the balance cylinder that seal 7 is connected with the low pressure suction port and forms, differential pressure action between the two sides is at balancing drum 5 like this, form the equilibrant that points to the low pressure direction, this power is used for the balance major part and acts on the weight of epitrochanterian axial force and pump rotor parts, and remaining axial force is born by the thrust bearing 21 that is provided with.Pump shaft can be a bearing, but bearing is adding easy bending deflection in man-hour, and part can only be worn axle from an end when the assembly and disassembly rotor part, and workload is big, the dismounting difficulty.Pump shaft is made up of last pump shaft 15, middle pump shaft 16, following pump shaft 17 in the present embodiment, last pump shaft 15 is connected with motor shaft by coupling 23, in the present embodiment, coupling 23 is an elastic dowel pin shaft coupling, can certainly adopt other suitable elastic coupling flexible couplings, connecting into together by coupling 8 between last pump shaft 15, middle pump shaft 16, the following pump shaft 17, is to adopt clamping coupling in this example, and it is convenient to assemble, dismantle.In pump shaft 16 water exit end 10, inlet segment 11, stage casing 12, stator 13, impeller 14 are connected successively, lock into the working portion of pump by pull bar 20, following runner and horn mouth are fixed on down pump shaft 17 tail ends.

Claims

1, the multistage vertical centrifugal condensate extractionpump of a kind of single suction comprises pump shaft, thrust bearing (21) and impeller (14), it is characterized in that: on the pump shaft between thrust bearing (21) and the impeller (14), be provided with balance sysmte.

2, the multistage vertical centrifugal condensate extractionpump of a kind of single suction according to claim 1, it is characterized in that: described balance sysmte is by balancing drum (5), balance set (6), seal (7) is formed, balancing drum (5) is a cylindrical body that has central shaft hole, be contained on the pump shaft between thrust bearing (21) and the impeller (14), the internal circular surfaces of balancing drum (5) outer round surface and balance set (6) forms radial clearance, balance set (6) is fixed on the balance seat (22) of electric machine support, be provided with seal (7) between thrust bearing (21) and balancing drum (5), seal (7) is fixed on the balance seat (22).

3, the multistage vertical centrifugal condensate extractionpump of a kind of single suction according to claim 1 and 2, it is characterized in that: described pump shaft is made up of last pump shaft (15), middle pump shaft (16), following pump shaft (17), be connected by coupling (8) between following pump shaft (17), middle pump shaft (16) and the last pump shaft (15), last pump shaft (15) is connected with motor shaft by coupling (23).

4, the multistage vertical centrifugal condensate extractionpump of a kind of single suction according to claim 3 is characterized in that: described coupling (23) is an elastic coupling flexible coupling.