CN202187930U

CN202187930U - Self-priming centrifugal pump internally provided with liquid ring vacuum pump

Info

Publication number: CN202187930U
Application number: CN2011202401291U
Authority: CN
Inventors: 邹礼生; 蔡文增
Original assignee: FOSHAN ANDRITZ TECHNOLOGIES Ltd
Current assignee: Andritz China Ltd
Priority date: 2011-06-21
Filing date: 2011-07-08
Publication date: 2012-04-11
Anticipated expiration: 2021-07-08
Also published as: CN102261338A

Abstract

The utility model relates to a self-priming centrifugal pump internally provided with a liquid ring vacuum pump, wherein a pump body of the liquid ring vacuum pump and a volute casing of a centrifugal pump are mounted on the same base and share the same pump cover; a working suction inlet of the liquid ring vacuum pump is arranged in a low-pressure area on the shared pump cover at a position adjacent to a rotating shaft; an adjusting suction inlet is arranged on the pump body of the liquid ring vacuum pump; and the adjusting suction inlet is connected with a vacuum adjusting valve. The utility model has the advantages that firstly, only one rotating shaft seal arranged between the pump body of the liquid ring vacuum pump and the rotating shaft can meet the requirements of sealing, thereby greatly simplifying the sealing structure and reducing the failure rate; secondly, as no electromagnetic switch valve is required to be arranged between the liquid ring vacuum pump and the centrifugal pump, the control system is simplified; and thirdly, overhigh vacuum degree is prevented from being produced by the liquid ring vacuum pump, the whistler is avoided, the operation power generation of the liquid ring vacuum pump is reduced, and the energy-saving effect is achieved.

Description

The self priming centrifugal pump of built-in liquid-ring vacuum pump

Technical field

The utility model relates to the self priming centrifugal pump of the self priming centrifugal pump that is used to extract liquid, particularly built-in liquid-ring vacuum pump.

Background technique

The self priming centrifugal pump of built-in liquid-ring vacuum pump is a kind of self priming centrifugal pump that liquid-ring vacuum pump and centrifugal pump are combined into one.This self priming centrifugal pump is when extracting liquid level and be lower than the liquid of pump housing height, and the liquid-ring vacuum pump that carries capable of using extracts the air in the centrifugal pump inlet pipeline section, the liquid of pumping is risen under atmospheric effect voluntarily get into centrifugal pump, accomplishes the self-priming process.

Yet; There is following defective in existing this self priming centrifugal pump: though the spiral case of the pump housing of 1 liquid-ring vacuum pump and centrifugal pump is installed on the same support; And the impeller of the impeller of liquid-ring vacuum pump and centrifugal pump is installed in the same rotating shaft; But the spiral case of the pump housing of liquid-ring vacuum pump and centrifugal pump remains separately independently, between the pump housing and rotating shaft of liquid-ring vacuum pump, between the pump housing protecgulum and rotating shaft of liquid-ring vacuum pump, between the spiral case of centrifugal pump and the rotating shaft rotary shaft sealing must be set respectively, and three road rotary shaft sealings altogether; Seal structure complex, rate of fault is high; 2, in order after accomplishing, to cut off the connected relation between liquid-ring vacuum pump and the centrifugal pump, must between liquid ring vacuum pump intake and centrifugal pump, electromagnetic switch valve be set, increase the complexity of control system thus from pumping phases; 3, do not have special vacuum conditions device, under the normal working after accomplishing from pumping phases, liquid-ring vacuum pump can produce too high degree of vacuum, not only can produce howling thus, also can make the liquid-ring vacuum pump long-time running at high power consumption state, wastes energy.

The model utility content

The purpose of the utility model is the defective to above-mentioned existing technology, provides a kind of simple in structure, compact, can stablize the self priming centrifugal pump of accomplishing apace from the built-in liquid-ring vacuum pump of pumping phases.

The utility model is achieved in that the self priming centrifugal pump of built-in liquid-ring vacuum pump; Comprise the pump housing of liquid-ring vacuum pump and the spiral case of centrifugal pump; The pump housing of liquid-ring vacuum pump and the spiral case of centrifugal pump are installed on the same support, and the centrifugal pump impeller in the vacuum pump impeller in the pump housing of liquid-ring vacuum pump and the spiral case of centrifugal pump is fixed in the same rotating shaft, and centrifugal pump impeller has front vane and back blade; The pump housing of liquid-ring vacuum pump and the spiral case of centrifugal pump are shared same pump cover; The pump cover that should share is the protecgulum of the pump housing of liquid-ring vacuum pump, also is the bonnet of the spiral case of centrifugal pump simultaneously, and the work intakeport of liquid-ring vacuum pump is located at the area of low pressure near rotating shaft on this pump cover of sharing; The pump housing of liquid-ring vacuum pump is provided with the adjusting intakeport, and this adjusting intakeport is connected with vacuum breaker.

The beneficial effect of the utility model is: 1, because the spiral case of the pump housing of liquid-ring vacuum pump and centrifugal pump is shared same pump cover; And the work intakeport of liquid-ring vacuum pump is located on this pump cover of sharing; Therefore rotary shaft sealing only need be set between rotating shaft at the pump housing of liquid-ring vacuum pump wants with regard to satisfying sealing; Compared with prior art, simplify sealing configuration greatly, reduced rate of fault; 2, between liquid-ring vacuum pump and centrifugal pump, electromagnetic switch valve need be set, simplify control system; 3, liquid-ring vacuum pump is connected with vacuum breaker, can avoid liquid-ring vacuum pump to produce too high degree of vacuum, has stopped howling, has reduced the operation power consumption of liquid-ring vacuum pump, has energy-saving effect.

Description of drawings

Fig. 1 is the utility model embodiment's a structural representation;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the right elevation of Fig. 1;

Fig. 4 is the B-B partial sectional view of Fig. 1;

Fig. 5 is the C-C partial sectional view of Fig. 1.

Embodiment

Self priming centrifugal pump according to the described built-in liquid-ring vacuum pump of the utility model; Extremely shown in Figure 5 like Fig. 1; Comprise the pump housing 1 of liquid-ring vacuum pump and the spiral case 2 of centrifugal pump; Both are installed on the same support, and the vacuum pump impeller 3 in the pump housing 1 of liquid-ring vacuum pump is fixed in the same rotating shaft 5 with the spiral case of centrifugal pump 2 interior centrifugal pump impellers 4.Centrifugal pump impeller 4 has front vane 4a and back blade 4b.The pump housing 1 of liquid-ring vacuum pump is shared same pump cover 6 with the spiral case of centrifugal pump 2, and this pump cover 6 of sharing is the protecgulum of the pump housing 1 of liquid-ring vacuum pump, also is the bonnet of the spiral case 2 of centrifugal pump simultaneously.The work intakeport 7 of liquid-ring vacuum pump is located at the area of low pressure near rotating shaft 5 on this pump cover 6 of sharing.Owing to need not to be provided with rotary shaft sealing as between the pump cover of sharing 6 and the rotating shaft 5, therefore whole self-priming pump only needs the pump housing 1 at liquid-ring vacuum pump that rotary shaft sealing 12 is set with rotating shaft 5 between just to satisfy that seal will.

The pump housing 1 of liquid-ring vacuum pump is provided with regulates intakeport 8, and this adjusting intakeport 8 is connected with vacuum breaker 9.The effect of vacuum breaker 9 is that when the degree of vacuum in the pump housing 1 of liquid-ring vacuum pump delimited above one, vacuum breaker 9 was opened; Make adjusting intakeport 8 and atmosphere on the pump housing 1 of liquid-ring vacuum pump; When the degree of vacuum in the pump housing 1 of liquid-ring vacuum pump was reduced to reasonable value, vacuum breaker 9 cut out, and the adjusting intakeport 8 on the pump housing 1 of cut-out liquid-ring vacuum pump is communicated with atmosphere; So loop control; The pump housing 1 interior degree of vacuum of liquid-ring vacuum pump is kept within the specific limits, avoid liquid-ring vacuum pump to send howling, reduced the operation power consumption of liquid-ring vacuum pump simultaneously because of producing too high degree of vacuum.At any time grasp the degree of vacuum of liquid-ring vacuum pump for ease of the operator, vacuum breaker 9 is connected with pressure vacuum gauge 10.

As simple proposal, vacuum breaker 9 can adopt commercially available manual ball valve, relies on manual control.But as optimum scheme; It is 200920058141.3 the disclosed vacuum breaker of Chinese utility model patent that vacuum breaker 9 should adopt the patent No.; The disclosed vacuum breaker of this patent not only can the automatic regulating valve door aperture; Avoid relying on manually operated trouble, and when pump is shut down, can stop the seal fluid in the pump housing 1 of residual liquid and liquid-ring vacuum pump in the spiral case 2 of centrifugal pump to leak through vacuum breaker 9.

The working principle of the utility model is: before primer pump; Close the outlet valve of centrifugal pump, make the spiral case 2 of centrifugal pump be in sealing state, open the sealing fluid system of liquid-ring vacuum pump then; The primer pump group; Vacuum pump impeller 3 is with centrifugal pump impeller 4 high speed rotating, and vacuum pump impeller 3 is through air in the spiral case 2 of work intakeport 7 extraction centrifugal pumps and the air in the centrifugal pump intake piping section, and the air of extraction is discharged through the relief opening 11 of liquid-ring vacuum pump; The liquid of pumping rises along centrifugal pump intake piping section voluntarily under atmospheric effect and gets into the spiral case 2 of centrifugal pump; Along with the liquid of pumping constantly gets in the spiral case 2 of centrifugal pump, the outlet pressure of centrifugal pump constantly raises until reaching or near the working pressure of centrifugal pump, so far accomplishing the self-priming process; The time length of self-priming process looks to inhale journey big or small and decide with pipeline, is generally tens seconds to clock more than a minute; Then open the outlet valve of centrifugal pump, and be adjusted to the operating point of centrifugal pump, centrifugal pump begins proper functioning; Because the work intakeport 7 of liquid-ring vacuum pump is located at the area of low pressure near rotating shaft 5; Therefore after the centrifugal pump proper functioning; Under the powerful centrifugal action of the back blade 4b of centrifugal pump impeller 4; In the spiral case 2 near the liquid great majority of the work intakeport 7 of liquid-ring vacuum pump can the pump housing 1 through work intakeport 7 entering liquid-ring vacuum pumps in; Can discharge from the relief opening 11 of liquid-ring vacuum pump through the liquid in the pump housing 1 of work intakeport 7 entering liquid-ring vacuum pumps on a small quantity, but relief opening 11 connecting ducts 13, so that the liquid of discharging is directed to set place; After being full of the liquid of pumping in the spiral case 2 of centrifugal pump; Liquid-ring vacuum pump has not had gas can be taken out, and along with remaining in operation of vacuum pump impeller 3, the degree of vacuum in the pump housing 1 of liquid-ring vacuum pump can continue to raise; (setting value of degree of vacuum is according to inhaling Cheng Erding when degree of vacuum surpasses setting value; Be as the criterion to satisfy the self-priming requirement), the valve of vacuum breaker 9 can be opened (if manual ball valve then need be opened through manual work) automatically, lets ambient air get in the pump housing 1 through overregulating intakeport 8; With this balance vacuum, guarantee the steady noise free of liquid-ring vacuum pump, high-efficiency operation; If the liquid of pumping contains portion gas, this portion gas can be taken away by liquid-ring vacuum pump, reaches stable pumping.

Claims

1. the self priming centrifugal pump of built-in liquid-ring vacuum pump; Comprise the pump housing (1) of liquid-ring vacuum pump and the spiral case (2) of centrifugal pump; The spiral case (2) of the pump housing of liquid-ring vacuum pump (1) and centrifugal pump is installed on the same support; Vacuum pump impeller (3) in the pump housing of liquid-ring vacuum pump (1) is fixed in the same rotating shaft (5) with the interior centrifugal pump impeller (4) of the spiral case (2) of centrifugal pump; Centrifugal pump impeller (4) has front vane (4a) and back blade (4b), it is characterized in that: the pump housing of liquid-ring vacuum pump (1) is shared same pump cover (6) with the spiral case (2) of centrifugal pump, and this pump cover (6) of sharing is the protecgulum of the pump housing (1) of liquid-ring vacuum pump; Also be the bonnet of the spiral case (2) of centrifugal pump simultaneously; The work intakeport (7) of liquid-ring vacuum pump is located at the area of low pressure near rotating shaft on this pump cover (6) of sharing, and the pump housing of liquid-ring vacuum pump (1) is provided with regulates intakeport (8), and this adjusting intakeport (8) is connected with vacuum breaker (9).