KR20080014658A - Two stage conical liquid ring pump having removable manifold, shims and first and second stage head o-ring receiving boss - Google Patents

Abstract

A two-stage conical liquid ring pump and a head for a liquid ring pump are provided to install a removable manifold to simplify casting work for a head and a body for good core support, good castability, and a low casting defect rate. A first head(32) has an inlet, an outlet, an extension through hole for shaft containing, and an inner end, wherein the inner end includes a boss having a side wall. A second head(33) has an inlet, an outlet, and an inner end. A body(14) has a first end combined with the inner end of the first head and a second end combined with the inner end of the second head. An interstage manifold(34) connects the first head with the second head. A head for a liquid ring pump includes an inner end having a rabbet with a side wall and a recess part, an inlet, an outlet, and an extension through hole for shaft containing extended through a head. The recess part is located between the shaft containing hole and the side wall of the rabbet.

Description

Two stage conical liquid ring pump having removable manifold, shims and first and second stage head O-ring receiving boss}

The present application relates to a liquid ring pump, in particular a conical two stage liquid ring pump.

This application relates to a pump. In particular, the present application relates to a two stage liquid ring pump used for vacuum generation. Liquid ring pumps are inherently low friction and therefore have a long service life and can therefore be used in wet industrial environments. The liquid ring pump removes air or gas by means of a freely rotating impeller in the eccentric casing. A working liquid, generally water, is provided to the pump and fired by centrifugal force to form a moving ring along the inner casing wall to create a sealed pumping chamber. A sealing liquid is also provided into the pump to seal the gap between the rotor and the other parts. Industry workers form wet paper pulp and nursery planting containers, used as egg cartons, or vacuum-contaminated groundwater to ground for treatment and many other applications. Highly reliable pumps are used for many applications, such as lifting soil improvement. Examples of liquid ring pumps are described in US Pat. No. 4,521,161 to Olsen et al. And US Pat. No. 5,899,688 to Senoi. The patents are incorporated herein by reference.

The two stage liquid ring pump according to the invention comprises two chambered bodies coupled to the first stage head at the first end and the second stage head at the second end. In the illustrated embodiment, the first and second stage heads include an inner surface, an inner surface or an inner end. Each end is configured to engage an opposite side of the body. At least one end has a face designed to receive a plurality of gaskets acting as shims to set the gap between the cone and the rotor in the body. The shims are used to form an axial space between the inner surface of the head and the ends of the body so that the clearance can be set. The gap between the cone and the rotor is important for maximum performance. The first and second stage heads each comprise a circular rabbit or boss on its face. The bosses are configured to receive an O ring to seal in the required application.

In an exemplary embodiment, the first and second stage heads are interconnected by removable interstage manifolds separated from the body. The intermediate manifold incorporates an air / water separation configuration for improved efficiency. The use of removable intermediate manifolds can simplify head and body casting for good core support, good castability and low casting defect rates, resulting in cost savings. The intermediate manifold has a variable cross section design for separating the air and water ejected from the first stage. The removable manifold allows the use of an O ring on the head. The removable manifold has a flange for an o-ring or gasket that is sealed with a corresponding flange face on the head. The through hole for the bolt in the flange is sized to accommodate the change in the end movement setting operation.

In an exemplary embodiment, the first stage cone includes an auxiliary discharge port consisting of two suitable exhaust holes formed in the first stage cone. The vent holes provide low speed stability, improving water treatment capacity and hydraulic noise reduction. The exhaust holes are arranged so that the high vacuum capacity is not affected. A low vacuum hogging condition exhaust hole reduces the excess compression of the rotor bucket, thereby reducing the maximum power requirement at low vacuum.

Further forms of the present application will become apparent when a person skilled in the art refers to the following detailed description of exemplary embodiments.

A liquid ring pump according to claim 1, comprising: a first head comprising an inlet, an outlet, a shaft receiving extension through hole and an inner end, the inner end including a boss having a side wall; A second head having an inlet, an outlet and an inner end; And

And a body having a first end coupled to the inner end of the first head and a second end coupled to the inner end of the second head.

The head for a liquid ring pump according to claim 8 of the present invention comprises: an inner end having a rabbit with side walls and a recess; An inlet; exit; And a shaft receiving hole extending through the head, wherein the recess is between the shaft receiving hole and the rabbit sidewall.

The use of removable intermediate manifolds in the present invention can simplify head and body casting operations for good core support, good castability and low casting defect rates, resulting in cost savings. In addition, the exhaust holes provide low speed stability, thereby improving water treatment capacity and hydraulic noise reduction.

The detailed description is described in particular with reference to the accompanying drawings below.

A two stage liquid ring vacuum pump 10 is shown configured to process large amounts of material without affecting continuous air flow. The pump 10 includes a rotor 12 positioned eccentrically with respect to the body 14. The body 14 has a first chamber housing 16 enclosing the chamber 16a. The body 14 also has a second chamber housing 18 enclosing the chamber 18a. As shown in FIG. 2, the first stage 38 is on the right side of the figure and the second stage 36 is on the left side of the figure. Manifold 34 joins the first and second stages.

The body 14 is suitably configured for the rotor 12 comprising an intermediate circular wall 48 that separates the first stage 38 from the second stage 36. The rotor 12 is coupled to the drive shaft 49 to rotate by the drive shaft 49 when power is applied to the drive shaft 49. The rotor 12 includes a first stage blade 52 and a second stage blade 54. The rotor 12 and drive shaft 49 are disposed in the body 14 such that a space 56 is created in the first chamber 16a and a space 58 is created in the second chamber 18a.

The first and second stage cones 60, 62 are also disposed within the body 14. The first stage cone 60 is disposed in the first chamber 16a and the second stage cone 62 is disposed in the second chamber 18a. The first stage head 32 is coupled to the body 14 at the end 201 of the first stage housing 16, and the second stage head 33 is, for example, as shown in FIG. 2. It is coupled to the body 14 at the end 206 of the two stage housing 18.

The first stage head or end shield 32 is configured to couple to the first chamber housing 16 of the body 14. The surface 79 of the first stage head 32 includes a plurality of holes 92 that allow the first stage head 32 to be secured to the first chamber housing 16 of the body 14. The first stage face, end or side 79 has a surface 179 configured to receive the shim 200. Shim 200 creates an axial space or spacing between end wall 201 and inner surface 179 of body 14. This spacing sets the end movement clearance between the cones 60, 62 and the rotor 12. In conical liquid ring pumps, it is important to properly set the clearance and move between the rotor 12 and the first and second stage cones 60,62. Failure to orient the parts properly can lead to premature wear and internal leakage, reducing vacuum pump efficiency.

The first stage head 32 is a circular rabbit on face 79 configured to receive an o-ring 202 to allow for sealing between the first stage head 32 and the body 14, or Boss 11. The o-ring 202 is sealed towards one end of the body 14 between the circumferential sidewall 203 and the inner wall 204 of the boss. The groove 203a that receives the O ring 202 is in the side wall 203. Since the intermediate manifold can be separated from the first stage head 32, an O ring can be used.

The first stage head 32 includes a recess 80 configured to receive the flange 82 of the first stage cone 60, for example as shown in FIGS. 4 and 5. The recess 80 includes a plurality of holes 84 that allow the first stage cone 60 to be attached to the first stage head 32. The first stage head 32 includes a central opening 86 configured to require a rotor drive shaft 49. The recessed portion is between the hole 86 and the boss sidewall 203. The first stage head includes a sealing water supply passage 88 so that the sealing water can enter the first stage conical passage 88a. The first stage head includes an air inlet 26 in fluid communication with the inlet port 70. The first stage also includes an outlet port 30 in fluid communication with the outlet port opening 66.

The first stage includes a pair of bracket members 90 to allow the pump 10 to be fixed.

The first stage cone 60 comprises a passage 20, in which an inlet port 70 is opened. The first stage cone includes a main discharge port 64 that opens into the discharge port opening 66. The first stage cone further includes an auxiliary release port 68. The auxiliary discharge port 68 includes two suitable exhaust holes for low speed stability, thereby improving water treatment capacity and reducing hydraulic noise. The secondary discharge port 68 is arranged so as not to affect the high vacuum capacity. The low vacuum hogging exhaust holes reduce excess compression in the rotor bucket or in the space 28 between the blades of the rotor 52. Correspondingly, the maximum power requirement in the low vacuum state is reduced. The pump can be operated at a speed lower than the normal tip speed with the exhaust holes of the first stage cone. The cone 60 has a linearly aligned beveled hole 67 to reduce hydraulic noise.

The second stage head or end shield 33 comprises intake ports 71a and 71b, which inlet ports 71a and 71b are configured to receive compressed air from the intermediate manifold 34. And a second chamber 71b configured to receive water from the intermediate manifold 34. The second stage head 36 includes an outlet port 81. The second stage head is configured to be coupled to the second chamber housing 18 of the body 14.

The second stage head 33 has a circular rabbit or boss 110a on the face 79a configured to receive the O-ring 202 to enable sealing between the body 14 and the second stage head 33. Include. Since the intermediate manifold can be separated from the second stage head 33, an O ring 202 can be used. The o-ring 202 is sealed in the same manner as the first stage head, i.e., between the inner wall 208 of the body 14 and the side wall 207 of the boss 110a. The o-ring is seated in the groove 210.

The first and second stage heads 32, 33 include outer support carriers 94, 96 to be adapted to the support drive shaft, for example, as shown in FIG. 2. The support carriers 94, 96 comprise bearings 98, 100 configured to support the drive shaft 9. At the first and second stage heads 32, 33 between the rotor and the remainder of the pump to seal the first and second stage heads 32, 33 from leaking along the drive shaft 49. Seals 102 and 104 are used.

The discharge port 30 and the intake port 71a, 71b are mating surfaces configured to receive an O-ring or gasket to seal the discharge port 30 and the intake port 71a, 71b with respect to the intermediate manifold 34. (mating surface; 77,78). The mating faces 77, 78 may include a plurality of holes 76 sized to accommodate changes in the end movement settings of the first and second stage heads 32, 33. Since the intermediate manifold 34 can be removed, manufacturing cost savings can be considered when selecting lightweight and corrosion resistant materials.

The standardized design of the pump 10 allows the gasket to be used between the body wall 201 and the first stage inner surface 79. The gasket serves a dual purpose as the shim 200 and the gasket 200 when the pump is used in general applications such as those used in the power industry. The standardized design makes it possible to use the same casting method using O-rings, with the exception of further processing for further demand applications, such as applications in the chemical industry. In industrial applications, the shim 200 is only used to set end movements, and the O-ring 202 is used to seal between the first stage head 32, the second stage head 33 and the body 14. Used.

Only in a gasket configuration without an O-ring, the gasket on the first or second stage head can act as a shim for setting the end movement clearance. Any gasket / seams used in the second stage head should be configured to seal the conduit 205. In general, the shim or gasket used in this configuration does not interfere with the use of the O ring 202, since it is not desired to use an O ring when using a gasket for sealing. Thus, the O ring 202 can be omitted. In contrast, when using an O-ring for sealing, it is not desired to use a gasket. Any gasket used is strictly seam.

In an O-ring configuration, the illustrated second stage inner surface, end or side 79a with surface 179a receives the shim to set the end movement between the cones 60 and 62 and the rotor 12. It is not configured to. The working liquid conduit 205 of the second stage head inhibits the effective use of the shim. The o-ring 209 seals the conduit 205 against the end face 206 of the body 14. When used, the shim interferes with the O-ring's ability to seal the conduit 205 relative to the end face 206 of the body 14. Thus, in order to be able to use the shim on the second stage head 33 in an O-ring configuration, the second stage head 33 must be reconfigured to be compatible with the shim's purpose. For example, conduits 205 may be removed and other conduit configurations may be used.

In the rotational operation of the rotor 12, air or gas is introduced into the inlet 26 of the first stage head and advanced in the direction shown by the arrow 112. Air enters the first conical passageway 20 through the inlet port 70. As the rotation operation proceeds, liquid (not shown) from the liquid ring is forced into the rotor bucket 28 to compress the air or gas and the mixture of gas and liquid is then first in the direction indicated by arrow 114. Forced outflow from conical discharge port 64 through stage head port 66. The air and gas mixture exits the first stage head through the port 30, enters the intermediate manifold 34 and proceeds in the direction indicated by arrow 116.

As the air / gas mixture moves along the manifold 34, the mixture enters the expansion zone 42, which is characterized by a downward inclined ramp 44 that is directed to the bottom 46. The bottom part faces the top 47. In the expanded portion, the liquid portion of the mixture falls to the bottom 46 and air remains above the liquid of the top 47. It is separated by the effect of speed reduction and gravity. Air enters the second stage 33 through the chamber 71a. The liquid enters the second stage 33 through the chamber 71b. Arrow 118 shows the air passing from the manifold into the second stage. Arrow 120 shows the water passing from the manifold into the second stage.

Although the embodiments have been shown and described in the drawings, these illustrations and techniques are illustrative and are not to be taken in a limiting sense of the text, but are shown and described only with respect to exemplary embodiments and all changes and modifications within the spirit of the invention. Will understand that it must be protected. Applicants have described and illustrated for illustrative purposes only and are not intended to limit or limit the invention to the above embodiments. The present invention has numerous advantages that can be obtained from various forms of detailed description. It should be noted that other embodiments herein do not include all forms already described and may benefit from at least some of the advantages of such forms. Those skilled in the art can readily devise related methods of incorporating one or more forms of the disclosure without the need for separate experimentation, while within the spirit and scope of the appended claims and the practice of the disclosure.

1 shows two vacancy bodies connected at a first end to a first stage head and at a second end to a second stage head, the first and second stage heads being interconnected by removable interstages. perspective view of a two-stage liquid ring pump with a chambered body.

FIG. 2 is an irregular cross sectional view along the pump longitudinal axis viewed through the first stage inlet, showing the first and second chambers and the first and second stage heads of the body and extending through the body and between a pair of cones Further showing a drive shaft coupled to a two-stage rotor disposed in the.

3 is an exploded view of the liquid ring pump shown in FIG.

FIG. 4 is a perspective view of a two stage liquid ring pump with the body, shaft and rotor removed from the pump to show the first stage cone relative to the first stage head, further illustrating the flow of air and water through the intermediate manifold. drawing.

FIG. 5 is a perspective view similar to FIG. 4 with the intermediate manifold removed from the first and second stage heads, further illustrating two vacancy inlet ports on the second stage head receiving air and water from the intermediate manifold; FIG. .

FIG. 6A is a perspective end view of the first stage conical conical member shown in FIG. 4. FIG.

6B is a side perspective view of the cone shown in FIG. 6A.

6C is a side plan view of the cone shown in FIG. 6A.

FIG. 7A shows the air inlet port and air outlet port for the intermediate manifold and also the face for forming and setting the clearance between the circular rabbit or boss on the head for sealing O-rings and the cone and rotor. Perspective view of the inner side surface of the first stage head.

7B is a rear view of the outer surface of the first stage head.

7C is a cross sectional view of the first stage head along lines 7-7.

7D is a plan view seen from the discharge port of the first stage head.

8A is a front view of an inner side surface of a second stage head.

8B is a side perspective view of the inner side surface of the second stage head.

8C is a cross sectional view of the second stage head along lines 8-8.

9A is an end plan view of the intermediate manifold.

9B is a cross sectional view of the manifold shown in FIG. 9A along lines 9-9.

Claims (12)

A first head having an inlet, an outlet, a shaft receiving extension through hole and an inner end, the inner end including a boss having a side wall; A second head having an inlet, an outlet and an inner end; And a body having a first end coupled to the inner end of the first head and a second end coupled to the inner end of the second head. The method of claim 1, The first head outlet is removably coupled to the first end of the intermediate manifold, And the second head outlet is removably coupled to the second end of the intermediate manifold. The method of claim 2, And the manifold free liquid ring pump integrally attached to the body. The method of claim 1, And the first head is a first stage head. The method of claim 1, And an inner end of the first head having a shim receiving surface, wherein the shim receiving surface does not form the face of the boss. The method of claim 5, wherein And the shim receiving surface has a plurality of through holes. The method of claim 6, And a plurality of shims between the end wall of the body and the shim receiving surface. An inner end having a rabbit having a sidewall and a recess; Entrance; exit; A shaft receiving hole extending through the head, And the recess portion is between the shaft receiving hole and the rabbit side wall. The method of claim 8, Wherein the head is a first stage head of a two stage liquid ring pump and the head comprises a manifold engagement flange at the outlet. The method of claim 8, Wherein the head is a second stage head of a two stage liquid ring pump and the head comprises a manifold engagement flange at the inlet. The method of claim 8, And said rabbit sidewall has a groove. The method of claim 8, Wherein said inner end has a shim receiving surface and a boss between said shim receiving surface and said recessed portion.

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