CN211692830U - Impeller capable of improving sealing performance of liquid ring pump - Google Patents

Abstract

The utility model belongs to the technical field of the liquid ring vacuum pump, concretely relates to can improve impeller of liquid ring pump leakproofness, including impeller wheel hub and a plurality of impeller blades of setting on it, impeller wheel hub on set up the runner, the runner runs through impeller wheel hub's the left and right sides. The utility model discloses make and become water-stop by the clearance seal originally between impeller and intermediate wall, the distribution dish that corresponds, the end of breathing in is thoroughly isolated with the exhaust end, reduces and has stopped inside gas leakage even, and pump wholeness can especially obtain obviously promoting in the high vacuum stage.

Description

Impeller capable of improving sealing performance of liquid ring pump

Technical Field

The utility model relates to a can improve impeller of liquid ring pump leakproofness belongs to liquid ring vacuum pump technical field.

Background

The liquid ring pump mainly takes water as a circulating medium, can be used as a vacuum pump and a compressor, and is mainly applied to gas extraction, compression, conveying and recovery in the industries of chemical industry, petroleum industry, coal industry, pharmaceutical industry and the like. Principle of liquid ring pump: the pump body is filled with a proper amount of water as working fluid. When the impeller rotates, water is thrown around by the impeller and, due to the centrifugal force, forms a closed ring of approximately equal thickness depending on the shape of the pump chamber. The inner surface of the lower part of the water ring is just tangent to the impeller hub, and the inner surface of the upper part of the water ring is just contacted with the top end of the blade (actually, the blade has a certain insertion depth in the water ring). At the moment, a crescent space is formed between the impeller hub and the water ring, and the space is divided into a plurality of small cavities with the same number as the blades by the impeller. If the lower part of the impeller is 0 degrees as a starting point, the volume of a small cavity is increased from small to large when the impeller rotates for 180 degrees and is communicated with an air suction port on the end surface, air is sucked at the moment, and the small cavity is isolated from the air suction port when the air suction is finished; when the impeller continues to rotate, the small cavity is changed from big to small, so that the gas is compressed; when the small chamber is communicated with the exhaust port, the gas is exhausted out of the pump. The water ring pump is a positive displacement vacuum pump in which suction, compression and discharge are performed by changing the volume of a pump chamber.

The double-stage pump is composed of a front cavity, a rear cavity and two independent impeller rotors, no friction piece is arranged in a pump cavity, the impellers are not in contact with a front distribution disc, a rear distribution disc and a middle wall, the precision of the liquid ring pump is mainly guaranteed by a gap between the rotors and the distribution discs, and a circulating medium is filled in the gap during work. The better the flatness of the distribution disc and the rotor, the smaller the gap, the better the sealing effect, the smaller the leakage, and the higher the performance of the obtained pump.

The traditional two-stage liquid ring pump structure is composed of a front rotor and a rear rotor, and a front cavity and a rear cavity which are respectively composed of a distribution disc, a middle wall group and a pump body. The circulating medium (working fluid) of the pump cavity is supplied from the bottom of the front pump cover and enters the impeller through the hole on the front distribution disc to play the roles of sealing and circulating. However, after the impeller rotates, the liquid is thrown around and is collected at the periphery of the pump cavity, and the water in the central part cannot play a sufficient sealing role. The wheel hub of preceding impeller and preceding plate of distributor still some water can be sealed, but preceding impeller and intermediate wall, back impeller and back plate of distributor just do not have enough water and seal, and water also can not advance the wheel hub position, only leans on the clearance to seal, and the end of breathing in will the UNICOM with the exhaust end, and gas is difficult to avoid having a small amount of revealing, advances the air inlet end from the exhaust end and produces inside revealing, has just so influenced the vacuum and the gas transport volume of pump.

SUMMERY OF THE UTILITY MODEL

According to the not enough among the above prior art, the utility model discloses the technical problem who solves is: the impeller capable of improving the sealing performance of the liquid ring pump is beneficial to sealing between the impeller and the distribution plate, and supports the improvement of the performance of the pump, particularly the improvement of the air flow under high vacuum.

Impeller that can improve liquid ring pump leakproofness, including impeller wheel hub and a plurality of impeller blades of setting on it, impeller wheel hub on set up the runner, the runner runs through impeller wheel hub's the left and right sides.

When the water replenishing port on the pump cover is used for feeding water, the water enters the impeller through the pump cover and the distribution disc, and sequentially enters the gap between the impeller and the middle wall through the flow channel arranged by the impeller, so that the original gap sealing between the impeller and the middle wall and between the impeller and the corresponding distribution disc is changed into water sealing, the air suction end and the air exhaust end are thoroughly isolated, the internal gas leakage is reduced or even stopped, and the performance of the pump is improved.

The impeller hub is provided with a water flow channel to help end face sealing, but once the impeller is too long, the impeller is difficult to mold by casting, so the impeller is preferably arranged in the following structure: impeller wheel hub include wheel hub inner tube, wheel hub urceolus and wheel hub end cap, wheel hub inner tube one end sets up the inner tube end cap, wheel hub urceolus cover establish wheel hub inner tube outside and with the wheel hub inner tube between leave the clearance, the wheel hub inner tube other end is equipped with the wheel hub end cap, inner tube end cap and wheel hub end cap are fixed a position the wheel hub urceolus, are equipped with the cluster water hole on inner tube end cap and the wheel hub end cap, the clearance between cluster water hole, wheel hub urceolus and the wheel hub inner tube forms.

Preferably, the water holes are uniformly distributed around the central shaft of the impeller hub.

Preferably, the peripheries of the impeller blades are connected through blade reinforcing ribs, so that the structural stability is enhanced.

Compared with the prior art, the utility model beneficial effect who has is:

the utility model discloses make and become water-stop by the clearance seal originally between impeller and intermediate wall, the distribution dish that corresponds, the end of breathing in is thoroughly isolated with the exhaust end, reduces and has stopped inside gas leakage even, and pump wholeness can especially obtain obviously promoting in the high vacuum stage.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of the inner hub barrel;

FIG. 3 is a schematic structural view of the hub outer cylinder;

FIG. 4 is a schematic view of the hub bulkhead;

FIG. 5 is a view from the direction A of FIG. 4;

FIG. 6 is a schematic structural view of an impeller blade;

FIG. 7 is one of the schematic forming processes;

FIG. 8 is a second schematic view of the molding process;

FIG. 9 is a schematic structural view of an auxiliary tool for an impeller welding tool;

FIG. 10 is a schematic diagram of the application of the present invention in a dual stage liquid ring pump;

FIG. 11 is a partial enlarged view of portion B of FIG. 10;

fig. 12 is a partially enlarged view of a portion C in fig. 10.

In the figure: 1. a hub inner barrel; 1.1, inner cylinder plug; 2. a hub outer cylinder; 3. a hub bulkhead; 4. an impeller blade; 5. blade reinforcing ribs; 6. a water stringing hole; 7. an auxiliary tool for an impeller welding tool; 8. an impeller.

Detailed Description

The invention will be further described with reference to the following examples:

as shown in figures 1-12, can improve impeller of liquid ring pump leakproofness, including impeller wheel hub and a plurality of impeller blade 4 of setting on it, impeller wheel hub on set up the runner, the runner runs through impeller wheel hub's the left and right sides.

The impeller hub is provided with the water stringing flow channel, the end face sealing is facilitated, but once the impeller is too long in length, the impeller is difficult to mold in a casting mode, therefore, the impeller hub comprises an inner hub cylinder 1, an outer hub cylinder 2 and a hub plug 3, one end of the inner hub cylinder 1 is provided with the inner cylinder plug 1.1, the outer hub cylinder 2 is sleeved outside the inner hub cylinder 1, a gap is reserved between the outer hub cylinder 1 and the inner hub cylinder 1, the other end of the inner hub cylinder 1 is provided with the hub plug 3, the inner cylinder plug 1.1 and the hub plug 3 are used for positioning the outer hub cylinder 2, the inner cylinder plug 1.1 and the hub plug 3 are provided with the water stringing holes 6, and the water stringing holes 6.

The water holes 6 of the present embodiment are evenly distributed around the central axis of the impeller hub.

The peripheries of the impeller blades 4 are connected through two circles of blade reinforcing ribs 5, and each circle of reinforcing ribs can be composed of two sections of semicircular rings.

When in manufacture:

firstly, obtaining a hub inner cylinder by casting, sleeving the hub outer cylinder on the hub inner cylinder, performing center positioning through an inner cylinder plug, and welding (as shown in fig. 7);

secondly, mounting a hub plug at the other end of the hub inner cylinder and welding to obtain an impeller hub (as shown in figure 8);

mounting and positioning auxiliary impeller welding tools at two ends of the impeller hub (as shown in fig. 9, the auxiliary tools are provided with bolt holes), and the auxiliary impeller welding tools at the two ends are connected through bolts;

fourthly, after the auxiliary tool for the impeller welding tool is installed, the impeller blade is inserted into the auxiliary tool for the impeller welding tool, after the auxiliary tool is adjusted in place, the root of the impeller blade is welded with the hub of the impeller,

fifthly, welding reinforcing ribs on the periphery of the impeller blade, and molding the impeller.

When water enters from the water replenishing port on the pump cover, the water enters the impeller through the pump cover and the distribution disc and enters gaps among the impeller, the distribution disc and the middle wall through a flow passage arranged on the impeller (as shown in figures 11 and 12), so that the original gap sealing among the impeller, the middle wall and the corresponding distribution disc is changed into water sealing, the air suction end is thoroughly isolated from the air exhaust end, the internal gas leakage is reduced or even avoided, and the overall performance of the pump is obviously improved particularly in a high vacuum stage.

Claims (4)

1. The utility model provides a can improve impeller of liquid ring pump leakproofness, includes impeller wheel hub and sets up a plurality of impeller blade (4) above that, its characterized in that: the impeller hub is provided with a flow passage, and the flow passage penetrates through the left side and the right side of the impeller hub.

2. The impeller capable of improving the sealing performance of the liquid ring pump according to claim 1, wherein: impeller wheel hub include wheel hub inner tube (1), wheel hub urceolus (2) and wheel hub end cap (3), wheel hub inner tube (1) one end sets up inner tube end cap (1.1), wheel hub urceolus (2) cover establish wheel hub inner tube (1) outside and with the wheel hub inner tube (1) between leave the clearance, wheel hub inner tube (1) other end is equipped with wheel hub end cap (3), inner tube end cap (1.1) and wheel hub end cap (3) are fixed a position wheel hub urceolus (2), be equipped with cluster water hole (6) on inner tube end cap (1.1) and wheel hub end cap (3), cluster water hole (6), the clearance between wheel hub urceolus (2) and wheel hub inner tube (1) forms the runner.

3. The impeller capable of improving the sealing performance of the liquid ring pump according to claim 2, wherein: the water holes (6) are uniformly distributed around the central shaft of the impeller hub.

4. The impeller capable of improving the sealing performance of the liquid ring pump according to claim 1, wherein: the peripheries of the impeller blades (4) are connected through blade reinforcing ribs (5).

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