CN2641328Y

CN2641328Y - Spiral shell shaped self-sucking type centrifugal pump

Info

Publication number: CN2641328Y
Application number: CN 03253289
Authority: CN
Inventors: 林恒远
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-09-03
Filing date: 2003-09-03
Publication date: 2004-09-15
Anticipated expiration: 2013-09-03

Abstract

The utility model relates to a spiral shell type self-sucking type centrifugal pump which belongs to centrifugal pumps and comprises casings, a belt pulley (1), an impeller (8), a bent tube (6), a water inlet (11) and a water outlet. A mechanical sealed chamber (10) is arranged on the casing outside a chamber of the impeller. A high and low pressure return duct is arranged on the casing at the upper part of the chamber of the impeller, and a suction side turning plate one-way valve (7) is arranged between the bent tube and the inlet of the pump. The utility model adopts the high and low pressure return duct and a turning plate valve structure and makes the pump have a self-absorption function, and the shaft seal of the utility model adopts double mechanical seal. The utility model is filled with lubricating oil, ameliorating the seal effect and lubricating and cooling the mechanical seal. At the same time, a cooling water channel is arranged outside the mechanical sealed chamber, and in the process of long-term running, the heat of the mechanical sealed chamber is conducted away by circulating water through the casing, stabilizing the working. The adopted double mechanical seal has the function of complementation, which guarantees favorable seal while air suction and drainage.

Description

The scroll casing type self-priming centrifugal pump

Affiliated technical field

The utility model belongs to a kind of centrifugal pump, and what relate generally to is a kind of scroll casing type self-priming centrifugal pump.

Background technique

Existing volute centrifugal pump (double shrouded wheel) does not have suction capacity, uses inconveniently, is used for press pump diversion effort and unreliable, and working in servicely has gas leakage slightly as suction line, promptly might fall pump, can not absorb water; Characteristics such as half-opened impeller self-priming centrifugal pump own loss power is big, and efficient is low; Double shrouded wheel self-priming centrifugal pump volume is big, discharge capacity is little, and the pump housing designs flowing of uncomfortable Heshui, and resistance is increased, and efficient is low, structure more complicated, not easy-maintaining etc.Simultaneously, the axle of volute centrifugal pump is bad with the pump chamber sealing, the glue envelope is generally arranged, asbestos insulating material seals gas leakage easy to wear, the maintenance rate height, and its assembly of single end face friction mechanical seal is installed in wheel inside, chamber, stationary ring is contained on the pump case, rotating ring rotates with axle, and spring withstands on the impeller back side, and machinery is sealed into the row cooling when not having enough water in the chamber if pump was taken turns when turning round, can raise rapidly because of dry friction makes temperature, burn out mechanical seal very soon, not a kind of situation is to be vacuum state in air-breathing or inside, suction hour wheel chamber, and outside air is easy to press off seal face or axle and rubber junction plane, make gas enter the wheel chamber, the pump cisco unity malfunction, and during bulge test internally, sealing surface and rubber make rubbing surface because of pressure, axle is fine with the rotating ring rubber seal, can not try the position that leaks gas, cause illusion to maintenance.

Summary of the invention

The purpose of this utility model promptly be propose a kind of can self-priming, efficient height, scroll casing type self-priming centrifugal pump easy to use.

The purpose of this utility model can adopt following technological scheme to realize: it comprises housing, belt pulley, impeller, bend pipe, water inlet and osculum, the mechanical seal chamber is set on the impeller cavity frame, indoor mechanical seal is set, it is that a high low pressure backflow road is set on the housing on top, wheel chamber, between water inlet bend pipe and the pump inlet place suction side turnover panel one-way valve is set.

Described high low pressure backflow road one end is positioned at the top, wheel chamber and the wheel chamber communicates, and the other end is positioned on the housing of pump inlet place top, is communicated with by a spray-hole and pump inlet place.

The indoor mechanical seal of described mechanical seal is double mechanical seal.

Lubricant oil is set in mechanical seal cover.

Be provided with cooling water channel in the mechanical seal outdoor, it communicates with the wheel chamber.

From the above mentioned, because the utility model adopts high low pressure backflow road and flap valve, can make pump have self-absorption function, double mechanical seal is adopted in its shaft sealing, and fill with lubricant oil within it, improved sealing effect, and mechanical seal is lubricated cooling, simultaneously, at the outdoor cooling water channel that is provided with of mechanical seal, the thermal conductance of mechanical seal chamber is walked by housing at long circulating water in service, make working stability, the double mechanical seal that adopts has complementation, promptly can both guarantee good sealing when air-breathing and draining.

Description of drawings

Accompanying drawing 1 is the utility model structural representation.

Among the figure, 1, belt wheel, 2, the machine room end cap, 3, the sealing of Double End friction mechanism, 4, high low pressure reflow pipe, 5, the backflow spray-hole, 6, bend pipe, 7, suction side turnover panel one-way valve, 8, closed centrifugal impeller, 9, cooling water channel, 10, the mechanical seal chamber, 11, water inlet.

Embodiment

In conjunction with the accompanying drawings, it is as follows to provide embodiment of the present utility model:

As shown in the figure, described centrifugal pump comprises housing, belt pulley 1, impeller 8, bend pipe 6, water inlet 11 and osculum, on the impeller 8 chamber framies mechanical seal chamber 10 is set, the indoor Double End friction mechanism that is provided with seals 3, the outside is by end cap 2 sealings, fill with lubricant oil in closed

chamber

10,10 outer installment have cooling water channel 9 in the mechanical seal chamber, and it communicates with impeller 8 chambers.One high low pressure backflow road 4 is set on the housing on top, wheel chamber, and suction port and wheel chamber that the one end is positioned at the top, wheel chamber communicate, and the other end is positioned on the housing of pump inlet place top, communicates by a spray-hole 5 and pump inlet place pipeline.Between water inlet bend pipe 6 and the pump inlet place suction side turnover panel one-way valve 7 is set, sealing spray-hole 5 when being used for work.

Working principle is: before the work, in pump, add water by filler 9, be bent upwards because of inhaling bend pipe 6, make and have a certain amount of water in the pump, when impeller 8 rotates, because of centrifugal force water and portion gas are thrown to the discharge tube position, gas separates from water and discharges through comb, a water returns the low pressure suction side through backflow spray-hole 5 and runner 4, be mixed into foam-like again by impeller 8 suctions and discharge, water and gas separation, reflux cycle once more then at suction eye water and gas, up to the gas in the suction pipe is sucked drain pipe begin the suction, the flow direction of suction pipe water is opened the unidirectional Flap valve 7 in suction side, just in time spray-hole 5 is closed after Flap valve 7 is opened, and high low pressure is refluxed stop, this moment, the water inlet self-acting valve was also closed the pump normal operation input.Draw water finish after, Flap valve 7 resets, and the water in the suction pipe and the pump housing is maintained, and needs during in order to turn on pump again.

Claims

1, a kind of scroll casing type self-priming centrifugal pump, comprise housing, belt pulley (1), impeller (8), bend pipe (6), water inlet (11) and osculum, on the housing outside impeller (8) chamber mechanical seal chamber (10) is set, it is characterized in that: a high low pressure backflow road (4) is set on the housing on impeller (8) chamber top, a suction side turnover panel one-way valve (7) is set between bend pipe (6) and pump inlet place.

2, scroll casing type self-priming centrifugal pump according to claim 1, it is characterized in that: described high low pressure backflow road (4) one ends are positioned at the top of wheel chamber, communicate with the wheel chamber, the other end is positioned at pump inlet place top, is communicated with by a spray-hole (5) and pump inlet place pipeline.

3, scroll casing type self-priming centrifugal pump according to claim 1 is characterized in that: the mechanical seal in mechanical seal chamber (10) is double mechanical seal (3).

4, scroll casing type self-priming centrifugal pump according to claim 1 is characterized in that: in mechanical seal chamber (10) lubricant oil is set.

5, scroll casing type self-priming centrifugal pump according to claim 1 is characterized in that: outer installment has cooling water channel (9) in mechanical seal chamber (10), and it communicates with impeller (8) chamber.