JPS58172497A - Casing for one-stage in-line type centrifugal pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a casing for a single stage in-line centrifugal pump. It consists of a pressure-resistant hollow body made of an embossed plate with a suction pipe and a discharge pipe lying on a common center line, the center edge of which is horizontally attached to the rotational axis of the impeller inserted into the discharge chamber through the mouth. The suction chamber, which intersects and communicates with the training pipe, and the discharge chamber, which communicates with the discharge pipe, are substantially separated from each other by a partition mounted as a separate member and communicating with each other only through nine openings provided in the partition. Single-stage inline/type centrifugal bong structure! related to casings.

This type of centrifugal pump, for example for heating installations or industrial water installations, is a single-stage single-stage pump whose impeller is used for energy transfer II7! The casing, which has a helically shaped guiding means, serves, inter alia, to convey the fluid to be pumped to the impeller base on the suction side and to discharge it from the horizontal wheel on the discharge side.9. The thing, of course, forms a pressure-tight boundary between the interior of the pump and the surroundings.

Many centrifugal heating and industrial water pumps on the market today have cast casings that are heavy and difficult to machine. In addition to the above-mentioned disadvantages, the cast casing also has the disadvantage that its rough surface causes pressure loss, which is detrimental to the efficiency of the pump.

In this respect, the embossed grade A casing is better.

A casing is known in which a separate member is inserted as a partition to divide the inner chamber of the casing into a suction chamber and a discharge chamber.

The suction pipe and the discharge pipe are formed from round tube members.

'::1 Inline type bong! In this case, the suction and discharge pipes are on a common centerline and have equal nominal diameters.

The ends of the tubes connected to the casing on the casing side are welded to the hollow body forming the casing body in a plane intersecting the center line of the tubes.

In the above-mentioned casing, which has a generally cylindrical shape, the outer hook-shaped casing member can be constructed relatively easily, but the shape of the built-in partition is extremely complicated, and its manufacture requires internal wires. It has actually been found that this is the case.

This is because the partition not only separates the chamber of the casing from the suction chamber and the discharge mK, but also, for fluidics reasons, the required helix must be formed in the discharge chamber.

If the piping system of the pumping equipment is originally laid out with stress-free material, or if stress changes occur in the piping connected to the pump during operation of the equipment, another related problem may occur. Turtles may occur. This is because such stresses and the resulting forces are transmitted to the pump casing via the pipes, resulting in deformation of the casing or in the direction of the pressure and drag loads. Because they are in a crossed state, this load must be fully absorbed, which can cause damage or leakage at the weld between the grate cousing member and the pipes connected thereto.

In addition, the two tubes are first stamped separately from the snowflake, then screwed and trimmed into the casing using the prescribed equipment, and finally these tube members are made into an annular seam. If it is necessary to make additional connections, considerable manufacturing costs will be incurred. In addition, the construction of such a casing requires the prefabrication of at least four separate parts.

The object of the present invention is to solve the above-mentioned conventional drawbacks, to be able to be constructed with only a few simple structural members, and to be easy to display.
To provide a highly durable casing for a single-stage inline centrifugal 4-wheel pump that can withstand high tension or pressure.

In order to achieve the above object, the casing odor of the present invention basically consists of nine pairs of breath molded members whose hollow bodies are connected to each other at joint surfaces set along the longitudinal direction of the casing, It is constructed such that the common center line of the suction pipe and the discharge pipe and the axis of rotation of the blade *Oa are on the joint surface.

In this way, due to the unique configuration of the joint surface, the hollow body that forms the pressure-resistant boundary between the inside of the casing and the surroundings, including the pair of connected pipes, can be manufactured using approximately 2 grate-shaped brace members. I can do something. Complex moldings, helical shapes of the casing and other flush geometries of fluid-conducting passages and chambers can also be produced without sacrificing extra mounting parts. As a result, the partitions can also be created quite easily.

The connecting portions of the pair of press molded members constituting the hollow body of the casing are bent in half to form flanges, and the seven flanges thus formed are joined together (8). ) and make them meet flatly Iw
Kemaka! It is desirable to secure it with ikg#I, thereby forming a lip for reinforcing the casing. This is it! is a section of a tube, usually cylindrically or conically shaped, running parallel or at least approximately parallel to the center line of the tube, so that the compression exerted on the pump casing by the line system connected to the tube Even if force or tension is generated, these forces act in the direction in which the lip was formed, so! The bearing can be sufficiently stopped by the casing and the casing, and there is no risk of excessive load being applied to the casing and the connecting part.

Hereinafter, embodiments of the casing according to the present invention will be described in detail with reference to the accompanying drawings.

The hollow body constituting the outer wall of the pump casing consists of a pair of press-formed parts 1.2 produced by stamping from a previously produced sheet metal blank. Press molded member 1
．． 2Fi, are joined to each other at the joint surfaces set along the longitudinal direction (horizontal direction in Fig. 1) of the casing and are connected. , is perpendicular to the plane of the figure and lies on the cutting plane ■-■. , @2 In the case of Figure 9, the joining direction is on the plane of the figure.

Separate from these elements 1.1, a partition 5, which is laterally mounted in the casing in the direction of the arrow 3 from the eye 4, divides the interior of the casing into a suction chamber 6 and a discharge W11. 7ij16 communicates with the suction pipe 8 and communicates with the chamber 1#'i discharge pipe 9. The tubes 8°9 lie on a common center 1iA10. In other words, the blade 11 in which the longitudinal axes of both the tubes 8 and 9 lie on the common center line 10 is of a known structure per se, so it is simply shown with a broken line, but it is not connected to the drive shaft (not shown). It is provided in the false part and rotates about an axis @XZ perpendicular to the center line 10.

A circular collar 5 that protrudes from the partition 5 and has an opening.
m is also located concentrically with this axis l1112. The suction chamber and the discharge chamber communicate through the opening, and the suction port of the blade *1 is aligned with this narrow opening.

On the joint surface set along the longitudinal direction of the casing, the center line 10 of both tubes 8 and 9 is also connected to the rotating ring 121 as shown in the figure.
9 also includes the axis 12 of the collar 5a. This results in a transparent split configuration of the casing for the pair of press-formed parts 1. can be produced with one processing authority.

The part where the pair of press-formed members 1.2 are connected is bent or punched out to form seven flange 13.14, so that the pair of press-formed members are flattened to each other at the joint surface. After coming into contact as shown in FIG. 1, they can be fixed to each other by 1lIII or adhesive. This], a lip is formed on the outside 111 of the finished casing, and this serves to reinforce the casing.
Since the force acting on the casing from the pipeline system connected to these pipes in the area is generally along the longitudinal direction of this lip, the external force can be sufficiently resisted by this υ.

Partition 5 is! It can also be made of other casing components using steel plates. When the partition 5 is installed laterally, it is inserted into the discharge chamber l through the eye 4, as shown in Figs. 2 and 3.
Press-formed members 1 and 2 joined in advance at the position shown in the figure
is combined with In this case, the connecting portion 15 between the book, the partition 5 and the members 1 and 2 is connected by welding or gluing.

By setting the joining direction of the members 1 and 2 in this way, the casing of the present invention can be made with only three members, namely, the pair of press-formed members 1 and 2 and the partition 5, and these three members The parts are ready to be connected. The pipe system connected to the four-ring casing can be simply inserted into the end-ports of the pipes 8 and 9 and connected, for example by welding, so that connections by screws, fittings, etc. are also possible in this respect. Simplification of assembly is achieved compared to the mounting of the casing if the stability of the area of the ends of the eye 4 or both W8.9 turns out to be insufficient, e.g. with a ring or split ring, These installations are at the mouth or tube.
These casing areas can be reinforced by inserting or press-fitting L7 into #As, and possibly also by welding, soldering or gluing.

[Brief explanation of drawings]

FIG. 1 is a top view of the casing of the bonde according to the present invention, 1
Figure 1g2 is a longitudinal cross-sectional view of the casing taken along line 1--1 in Figure 1, and Figure 1183 is a cross-sectional view of the casing taken along line -IiiiK in Figure 1. 1, 2...Hollow body/less molded member, 5...Specification 6
...Suction chamber, 2...Discharge chamber, 8...Suction pipe, 9.
...Discharge pipe, 10... Center line, 11... Impeller, 1
2...Rotation axis.

Claims (1)

[Claims] 1. Suction pipe (8) and discharge pipe (9) located on a common center line
It consists of a pressure-resistant hollow body (1, z) made of an embossed grate with the center line horizontally mounted and discharged through the opening (4)'! M(
The suction chamber (6), which intersects perpendicularly with the rotational axis (12) of the impeller (11) inserted into the shaft and communicates with the suction pipe (8), and the discharge chamber, which communicates with the discharge pipe (9), are separated. In a single-stage in-line centrifugal pump casing which is substantially separated from each other by a partition (6) attached as a member of the partition and which communicates with each other only through an opening provided in the partition, said nine bodies are connected to each other in said casing. It consists of a pair of press-formed members (7) set along the longitudinal direction and connected to each other at the joint surfaces, with the center 11
(A casing in which the ring edge (12) of J is on standby on the joint surface. 2) The connecting portion along the joint surface of the pair of press-formed members C1, The casing according to claim 1rA, wherein the casing has been processed to have 7 runs (JS,