CN2415186Y - Unit construction centrifugal water pump - Google Patents

Abstract

The utility model relates to a direct-coupled centrifugal water pump, which is composed of a motor casing, an iron core of a motor, a motor shaft, a bearing, a seal bottom cover of the motor, a seal top cover of the motor, a water projecting disc, a seal cover of the water pump, a seal, a diversion cover, an impeller, a pump casing, a pump cover, etc. The inner of a shaft center of the motor shaft is provided with a flow cross channel which uses a shaft center pipe as a shaft center hole, an outlet of the shaft center pipe and a shaft center backflow channel. The side surface at the shaft extension bottom end of the motor shaft is provided with a drain hole which is communicated with the shaft center backflow channel. The utility model has the advantages of favorable cooling effect of the motor, no damage of the normal liquid flow of the impeller, axial force balance, slow ageing speed of an insulation layer of the motor, long service life of the bearing and good hydraulic performance of the water pump.

Description

The straight connection type centrifugal water pump

The utility model belongs to a kind of centrifugal water pump, particularly is applicable to the straight connection type centrifugal water pump of carrying clear water.

Be used for the straight connection type centrifugal water pump that clear water is carried at present, the cooling of its bearing and electric machine iron core is to rotate by the fan blade in the motor, make air generation convection current and conduction, and heat comes out by motor housing and finishes.This cooling structure is low because of the air thermal conductivity, and heat conduction path is long, and thermal resistance is big, and cooling effect is poor, therefore causes the electrical machine insulation layer aging fast, bearing shortening in working life.In addition, the axial force balance structure of above-mentioned straight connection type centrifugal water pump, normally on impeller, establish spilled water hole and release pressure in the counter balance pocket, so also exist the technical issues that need to address such as the interior normal liquid stream of impeller is damaged, the reduction of water pump hydraulic performance with this hole.

The purpose of this utility model provide a kind of clear water of self carrying when utilizing water pump operation flow through electrical axis reach cooling motor bearing and electric machine iron core reach again simultaneously do not destroy normal impeller liquid stream, make axial force balance, aging slow, the bearing long service life of electrical machine insulation layer, straight connection type centrifugal water pump that the water pump hydraulic performance is good.

The utility model mainly by the motor casing that is provided with water intake and water inlet flow channel, electric machine iron core, motor seal bottom, motor seal top cover, water-throwing disk, water pump packing lid, Sealing, fairing cap, bearing, impeller, be provided with water outlet pump case, by the outer cylinder of being located at the pump cover bottom surface and be located at the back shroud of impeller end face interior short cylinder and have the sealing configuration of seal clearance, motor shaft to constitute between the two slightly.Wherein, motor shaft be drilled with in its axle center one little to hole, position, water pump packing caping slightly upper from top to bottom, the axis hole that strengthens to hole, position, water pump packing caping slightly upper from top to bottom, to put on bottom head that a lower end side is provided with axle center pipe water outlet in the axis hole is that the axle center pipe of cecum is crossed water flow passage as axle center hole, between axis hole axis core barrel outer wall that adds macropore and shaft hole inner wall, form the axle center back return-flow system, have a spilled water hole that is connected with the axle center back return-flow system in the shaft extension lower end side of motor shaft.

Below in conjunction with accompanying drawing description is made in enforcement of the present utility model.

Fig. 1 is a structural representation sectional view of the present utility model.

According to shown in Figure 1, be provided with the upper end in motor casing 12 perisporiums and be communicated with the water inlet flow channel 14 that the lower end links to each other with water intake 17 with the runner 24 that catchments.Be drilled with an axis hole in the axle center of motor shaft 7, axis hole is little to hole, position, slightly upper, water pump packing lid 22 top from top to bottom, strengthen to hole, position, slightly upper, water pump packing lid 22 top from top to bottom, to put on a foundation termination in the axis hole is that the axle center pipe 11 of cecum is crossed water flow passage 8 as axle center hole, manage side, 11 bottom in the axle center and be provided with axle center pipe water outlet 15, form axle center back return-flow system 19 between axis hole axis core barrel 11 outer walls that strengthen in the hole and shaft hole inner wall, be drilled with a spilled water hole 10 that is connected with axle center back return-flow system 19 in that the shaft extension lower end side is horizontal.Short cylinder in Last impeller 3 back shroud end faces are provided with successfully, the bottom surface of pump cover 9 be provided with successfully a corresponding with it internal diameter be a bit larger tham be located on Last impeller 3 back shrouds within the outer cylinder of short outside diameter of cylinder, form a sealing configuration 5 by seal clearance ground slightly between the two by interior short cylinder and outer cylinder.Install electric machine iron core 13, install bearing 16, cover motor seal bottom 18, electric machine iron core 13 and impeller 3 common motor axles 7, motor casing 12 upper ends between electric machine iron core 13 and impeller 3 are equipped with the motor seal top cover 20 that is provided with bearing 16 successively, be installed on water-throwing disk 21 on the motor shaft 7, be provided with water pump packing lid 22, the fairing cap 25 of Sealing 23, with the good upper and lower impeller 3 of fixed by nut, install pump case 2 and pump cover 9 in the top of motor shaft 7 shaft extensions.

Straight connection type centrifugal water pump of the present utility model, at first electric machine iron core 13 energisings make motor shaft 7 impeller 3 high speed rotating during work.Water sucks from water intake 17, arriving impeller water inlet 24 through water inlet flow channel 14 is sucked by impeller 3, form press water, the press water major part is discharged from water outlet 1, little pressure water leaks water by the seal clearance formation of sealing configuration 5 and enters counter balance pocket 6, the leakage water of counter balance pocket 6 through axle center hole cross water flow passage 8, axle center pipe water outlet 15 enters axle center back return-flow system 19, then the heat that bearing 16 and electric machine iron core 13 work are produced takes away to the impeller suction 24 from spilled water hole 10.This working procedure of the present utility model has reached two purposes, one is that water pump counter balance pocket leakage water can in time be got back to the impeller suction, in the water pump counter balance pocket, can't form with the water-aspirator pressure chamber in suitable pressure, finished not only balancing axial thrust but also do not destroyed the purpose of the normal liquid stream of impeller; Another is the heat that produces when in time having taken away bearing and electric machine iron core work, has reached cooling motor, prolongs the electrical machine insulation layer purpose in working life.

Claims (1)

1. one kind by the motor casing (12) that is provided with water intake (17) and water inlet flow channel (14), electric machine iron core (13), motor shaft (7), bearing (16), motor seal bottom 18), motor seal top cover (20), water-throwing disk (21), water pump packing lid (22), Sealing (23), fairing cap (25), impeller (3), by being located at the outer cylinder on pump cover (9) bottom surface and being located at the sealing configuration (5) that the interior short cylinder of a last impeller (3) back shroud end face is formed, be provided with the pump case (2) of water outlet (1), the straight connection type centrifugal water pump that pump cover (9) constitutes, it is characterized in that being drilled with in the axle center of motor shaft (7) one little to hole, position, slightly upper, water pump packing lid (22) top from top to bottom, the axis hole that strengthens to hole, position, slightly upper, water pump packing lid (22) top from top to bottom; To put on bottom head that a lower end side is provided with axle center pipe water outlet (15) in the axis hole is that the axle center pipe (11) of cecum is crossed water flow passage (8) as axle center hole; Between axis hole axis core barrel (11) outer wall that adds macropore and shaft hole inner wall, form axle center back return-flow system (19); Be drilled with a spilled water hole 10 that is connected with axle center back return-flow system (19) in that the shaft extension lower end side of motor shaft (7) is horizontal.