JPS58117392A - Casing for fluid machine - Google Patents

Abstract

PURPOSE:To reduce the weight of a casing for a fluid machine, by attaching members used for the piping and installation of the fluid machine to the outside of an inner casing in tight contact therewith, and providing a reinforcing casing for reinforcing the inner casing. CONSTITUTION:Since a negative fluid pressure is acted to an inner casing 1, a material consisting mainly of concrete such as plastics concrete, having a proper rigidity and an adhesiveness to a reinforcing casing 7, for instance, is suited as the material for the inner casing 1. Although the inner peripheral portion of a suction port 2 tends to be ruptured by the negative pressure acted thereto, a compressive force is acted to the member surrounding the suction port 2 since the reinforcing casing 7 and a flange 13 are provided in contact with the suction port 2. Further, since pressure is acted to a volute portion 11, its side face and the inner peripheral surface of an outlet port 5, the inner casing 1 is also subjected to pressure but it is backed up by the reinforcing casing 7.

Description

[Detailed description of the invention] Concerning casings for water turbines, water turbines, etc.

Conventionally, the casings of pumps, water turbines, etc. have mainly been made of iron, but recently, the number of casings made of iron plates has been increasing.In the past, there were also casings made of concrete using materials other than these.

If cast iron is used, the material cost is high. Because it is heavy, it is not suitable if the product is portable, and there are problems such as high transportation costs when handling the material.Those made of iron plates are pressed on small machines, but press distortion must be taken into consideration. There are technical difficulties involved in processing the material. Press-made ones have low rigidity and are easily distorted by external forces, so they are limited to small sizes.

If it is made of iron plate, there are problems such as the possibility of generating vibration noise. same. Concrete water turbines are extremely large and must be constructed on-site at the installation site, so they are generally not suitable.

On the other hand, with recent calls for resource conservation, the finite nature of raw materials has actually led to competition for resources, and it is predicted that the current cast iron, iron plates, etc. will be supplied with light in the future. do not have.

The present invention/fi has been developed based on the above background, and an object of the present invention is to provide a casing for a fluid machine that is corrosion resistant, produces less noise during imaging, and is lightweight.

The present invention is designed to fit tightly to the outside of an inner casing of a fluid machine, which is mainly made of a material that can withstand compression, and has an inner wall that forms a working space for fluid between an inlet side where fluid flows in and an outlet side where fluid flows out. The reinforcing casing is provided with a mounting member and is formed in the shape of an outer shell to reinforce the inner casing.

Hereinafter, the present invention will be described in detail with reference to the drawings. The example is a horizontal centrifugal pump, but the invention is not limited thereto. FIG. 1 is a side view partially shown in longitudinal section, and FIG. 2 is a sectional view taken along the line AA in FIG. 1.

The inner casing l has a suction port λ as a pump.

In the figure, the pump chamber 3 is the space where the impeller is housed. A discharge port S is formed. The inside of the inner casing l is a groove near the fitting part g between the casing cover 6 and the reinforcing casing 7, and has a cylindrical part larger than the outer diameter of the impeller, and the outer periphery of the impeller has a spiral shape. Part//Nateshi.

A liner ring 12 is fitted into the inner casing at the inner periphery between the suction port λ and the pump chamber 3 to provide a water seal between the inner periphery and the outer periphery of the suction boss of the impeller.

Since the internal casing 1 receives negative pressure as fluid pressure, the adhesive strength with the reinforcing casing 7 is poor, and it requires a rigidity comparable to that of its own material, but the compressive strength must be high because the internal casing 1 receives internal pressure, and the tensile strength is 5. may be low because the reinforcing casing 7 is strong, such as a steel plate.

From these points of view, examples include cement, cement-based concrete, plastic concrete, ie, polymer cement concrete, polymer-impregnated concrete, resin concrete, or materials to which sand or the like is added as an extender.

The reinforcing casing 7 is made of a plate material that is in close contact with the inner casing, and is selected to have the simplest possible shape 2, for example, a substantially cylindrical shape as shown in the figure. The reinforced casing 7 is a part of the reinforced casing 7 and has a suction pipe,
A flange 13 for connection to a discharge pipe and a 7 flange/F shown in a plan view in FIG. 3 are welded to each other, and a tap hole 73 (14t) for attachment is provided, respectively. Reinforced casing is the strength of the entire casing.

Something that maintains rigidity, such as a perforated plate or an iron plate.

Wire mesh is used.

The casing cover 6 fitted into the fitting part g of the reinforced casing is made of a press, and the motor bracket /& is further fitted into the cover 6.

Insert the bolt hole of the bracket IS and the bolt hole of #cover 6 into the tapped hole that passes through the protrusion member 16 arranged on the circumference of the material that forms the fitting section on the side of the reinforcing casing. Pol)/? is screwed in.

A pump shaft/q integrated with the motor shaft is supported by a bearing 1g fitted into the bracket 15 and a bearing fitted into a bearing (not shown) held by the end bracket of the motor so as to be rotatable and not move in the axial direction. , pump shaft l
? A shaft sealing collar 21 is fitted and fixed on the outside of the motor, the pump shaft 9 enters the pump chamber 3, and the casing cover 6
The shaft is sealed between the shaft sealing part fλλ installed between the
The impeller at the tip is the tapered part of the pump shaft 19/? A and is fixed by screwing a nut 23 onto the male thread at the tip of the pump shaft 19. Rotating parts such as these impellers,
The support portion and shaft seal portion are known.

When the motor is energized, the pump shaft 19 rotates.

The impeller rotates. The liquid sucked through the suction port is accelerated and pressurized by the impeller, the pressure is recovered in the swirl chamber, and the liquid is discharged from the discharge port 3.

Negative pressure applied to the inner periphery of the suction loco attempts to crush the internal casing/in that area, but the reinforcing casing 7.7 The flange 13 is adhered, and the outer periphery of the suction port λ is cylindrical, so the compressive force is suppressed. receive.

Pressure is applied to the spiral portion /1, its side surface, and the inner periphery of the discharge port S, so the internal casing /1 receives pressure, and the reinforcing casing backs up the internal casing /1 to counteract the fluid pressure.

As described above, according to the casing for a fluid machine according to the present invention, since the inner casing is made of concrete, the distribution effect is reduced, and noise is reduced.

The inner casing is corrosion resistant and can be made of concrete material, so you can choose a material that can handle special liquids. Both are made of inexpensive materials, and the amount of iron used in the casing, which uses the most iron, is reduced. The reinforcing casing is made of iron plate and has a very simple shape, so it is easy to manufacture and requires very few machining parts.

Since iron plates are used for reinforcement, perforated plates can often be used by forming press scraps.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a partial vertical sectional view of an embodiment of the present invention;
2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a partial plan view of FIG. 2. ／・・Internal casing −・・Suction port 3・・Pump chamber ・・・Impeller ・・・Discharge port 6・・Casing cover 7・・Reinforced casing ・・・Fitting part ・・・Cylindrical part //・・Spiral part /, 2...Liner ring /3
．． /'I...Flange /,? A,/DAAN・Tamp hole lS-・Bracket 16・Protruding member L・・Holt 1g・・Bearing 19・Pump shaft Column・Shaft seal collar 22・・Shaft seal device 23・・Nut. Patent Applicant Ebara Urasakusho Co., Ltd. Agent Arai - Department (7) (ff) Figure 3 Figure 2 14 14A 1 ・°・-Puff°・ha""' 1
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Claims (1)

[Scope of Claims] / An inner casing made of a raw material that can withstand compressive action, comprising an opening for assembly of functional parts of a fluid inlet and an outlet of a fluid machine, a fluid passage, and a shape forming a fluid working space; A casing for a fluid machine consisting of a reinforced casing that tightly covers the outside of the casing and is provided with piping attachment members that match the fluid inlet and fluid outlet of the inner casing. 2. A casing for a fluid machine according to claim 1, wherein the inner casing made of a material that is primarily resistant to compressive action is an inner casing made of a concrete-based material.