JPH0654114B2 - Method for manufacturing rotor for rotary fluid pump - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a rotor for a rotary fluid pump, and more particularly to a method for manufacturing a hollow rotor.

[Prior Art] Rotary fluid pumps are widely used in many industrial fields, but since they have a relatively large weight, there has conventionally been a demand for weight reduction. Particularly in transportation, there has been a strong demand for weight reduction of pumps as an energy saving measure.
Since the main cause of the heavy weight of the pump is the rotor of the heavy solid body, in order to reduce the weight of the pump, the rotor must be changed from the heavy solid body to the light hollow body. For that purpose, a method for efficiently manufacturing a hollow rotor is required.

Conventionally, hollow-structured rotors have been known, but conventional hollow-type rotors are either cast to form a hollow structure, or forged to form a solid rotor first, and then a hollow structure is formed by drilling. It was manufactured by a method such as or.

[Problems to be Solved by the Invention] However, in the manufacturing method as described above, it is difficult to significantly reduce the thickness of the rotor in order to maintain the strength required for the rotor. There is a problem that is.

Further, it is difficult to make the thickness of each part of the rotor formed in the hollow structure uniform, and there is a possibility that partial distortion will occur when thermally deformed.

Furthermore, it is not possible to use different materials for the rotor parts in accordance with the required characteristics of the rotor parts, and it is difficult to achieve all the rotor strength, vane groove slidability, shaft part durability, etc. in the optimum state. There is also the problem that

INDUSTRIAL APPLICABILITY The present invention is capable of easily and accurately manufacturing a hollow rotor having a relatively thin structure, capable of achieving a significant weight reduction while maintaining necessary strength, uniform thermal deformation, and a material suitable for each part. It is an object of the present invention to provide a method for manufacturing a hollow rotor, the selection of which can be easily performed.

[Means for Solving Problems] A method for manufacturing a rotor for a rotary fluid pump according to the present invention, which is directed to this object, has a hollow rotor body having a vane groove and a shaft protruding from at least one side surface of the rotor body. In a method for manufacturing a rotor for a rotary fluid pump, four flat plate members are assembled in a well shape to form a well-shaped member having a vane groove portion, and at least one of the well-shaped member and a rotor outer plate is formed on the well-shaped member. Is a method of joining side plates on both side surfaces of a rotor body having a shaft.

The well-shaped member is assembled, for example, by cutting each of the four plate members with two slits and inserting another plate member into the slit of each plate member.

[Operation] In such a method for manufacturing a rotor for a rotary fluid pump, since the vane groove is formed by a flat plate-shaped plate material, the structure is accurately configured, and the frame inside the rotor hollow together with the vane groove is incorporated in a square shape of the plate material. Since it is constituted by a structure, it is possible to obtain a hollow structure having a sufficient strength while having a relatively thin and lightweight structure. And, since it is a manufacturing method in which a rotor outer peripheral plate of another member and a side plate having a shaft on at least one side are joined to the well-shaped member from the outside,
Joining and assembling are easy. Moreover, four plate materials,
Since the rotor outer plate and the side plate are plate-shaped members, by selecting the plate-shaped member to be used, the thickness of each part of the rotor can be made uniform, and a structure that does not locally generate strain due to thermal deformation In addition, the most suitable material for each part of the rotor can be easily selected.

[Embodiment] A preferred embodiment of a method for manufacturing a rotor for a rotary fluid pump of the present invention will be described below with reference to the drawings.

1 to 5 show a method of manufacturing a rotor for a rotary fluid pump according to an embodiment of the present invention in the order of steps.

First, as shown in FIG. 1, four flat plate members 1a, 1
b, 1c and 1d are assembled in a well shape as shown in FIG. 2 to form a well shaped member 3. Plate materials 1a, 1b
1c, 1d are each provided with two slits 2 each having a length 1/2 of the plate materials 1a, 1b, 1c, 1d, and the plate materials 1a, 1d have the same sides of the plate materials 1a, 1d. Two parallel slits 2 opening toward the plate member 1
Two slits parallel to each other are provided in b 1 and 1c on opposite sides of the plate materials 1b 1c. Then, the positions of the slits 2 of the plate materials 1a, 1b, 1c, 1d are made to correspond on the same line as shown by the alternate long and short dash line in FIG. 1c
1d so that each slit 2 receives an extension of the slit 2 of another plate.

As a result, the well-shaped member 3 as shown in FIG. 2 is assembled. Since the width of each slit 2 is set to be substantially the same as the thickness of other plate materials that the slit 2 receives,
The assembled well-shaped member 3 is assembled to a predetermined precision with no play. These four plate materials 1a, 1b, 1c,
1d is welded at the stage of being assembled in the well-shaped member 3.
They may be joined together by brazing or the like, and as shown in the next step, by joining the outer peripheral plates of the rotor, four plate materials 1a, 1
The b, 1c and 1d may be joined and fixed. The cross-shaped member 3 thus assembled forms the vane groove 4 as shown in FIG.

Next, as shown in FIG. 3, four circular arc-shaped rotor outer peripheral plates 5a, 5b, 5c, 5 are formed on the well-shaped member 3.
d is installed. These four curved plates 5a, 5b, 5c
5d are joined to the well-shaped member 3 by welding, brazing or the like.

Next, as shown in FIG. 4, side plates 8a having shafts 6a and 6b and constituting both side surfaces in the axial direction of the rotor main body 7,
8b is joined to the well-shaped member 3 by welding, brazing or the like to complete the rotor 9 as shown in FIG. (Depending on pump type, side plate 8b without shaft 6b
Sometimes. At this time, at the time of joining, a hole (not shown) for communicating the hollow portion formed by the well-shaped member 3, the rotor outer peripheral plates 5a, 5b, 5c, 5d, and the rotor body side plates 8a, 8b with the outside. Are provided on the side plates 8a, 8b and the shafts 6a, 6b. The reason is that if no holes are provided, the air in the hollow part expands, and in some cases the flux etc. burns, generating combustion gas,
This is because good brazing, welding in a furnace, or the like cannot be performed. It is desirable that the hole communicating with the outside be closed later. After that, the protrusions and the like on the outer periphery of the rotor 9 are cut, and the rotor 9 with high accuracy centering on the shafts 6a and 6b is completed.

In the above embodiment, the rotor outer peripheral plates 5a, 5b, 5c are
Although the rear side plates 8a and 8b are joined by joining 5d, this order may be reversed or simultaneous incorporation.

Regarding the method of forming the outer circumference of the rotor, see FIGS.
It may be as shown in the figure. That is, as shown in FIG. 6, the cylinder 10 is externally attached to and joined to the well-shaped member 3, and then, as shown in FIG. 7, the vane groove portion 4 of the cylinder 10 is cut to form the outer circumference of the rotor. You may do it.

In the rotor manufacturing method as described above, in the vane groove 4
Together with the hollow rotor, the internal frame of the four plates 1a, 1
It is formed by a well-shaped structure with b, 1c and 1d. The well-shaped structure guarantees sufficient strength even with a relatively thin plate material. Also, a flat plate material 1
By selecting a, 1b, 1c, and 1d as appropriate members, a vane groove sliding surface with good surface accuracy can be obtained without cutting. Then, the slit 2 of each plate 1a, 1b, 1c, 1d is accurately cut, so that the well-shaped member 3 is finished by simply incorporating each plate 1a, 1b, 1c, 1d. , The vane groove 4 having good parallelism on the parallel surfaces can be easily obtained. Moreover, as can be seen from FIG. 1, the plate material 1a and the plate material 1d are the same, and the plate material 1b and the plate material 1c are the same.

In addition, the rotor outer peripheral plate 5a joined to the well-shaped member 3
5b, 5c, 5d or the cylinder 10 and the side plates 8a, 8b having the shafts 6a, 6b have a simple shape, and by simply joining the respective members of these simple shapes,
A hollow, lightweight rotor 9 that is thin and satisfies the required strength and accuracy is completed.

Further, the well-shaped member 3, the rotor outer peripheral plates 5a, 5b, 5c.
Since 5d and the side plates 8a and 8b are plate-shaped members,
Each is easily made to have a uniform wall thickness. As a result, even when the rotor 9 is thermally affected, it is easy to make the entire thermal deformation amount uniform, and local strain is prevented from occurring.

Furthermore, the method of the present invention, unlike conventional casting and forging,
Since this is a method of assembling and joining separate members, each material can be appropriately selected, and by selecting an appropriate material, the optimum material can be easily selected according to the required characteristics of each part of the rotor. For example, forged products are required for the shafts 6a and 6b where strength and wear resistance are required, and iron-based materials and non-ferrous materials are used for the vane groove 4 and rotor outer circumference where strength and wear resistance as well as weight reduction are desired. Materials, non-ferrous alloy materials, etc. are appropriately selected.

[Advantages of the Invention] According to the present invention, it is possible to easily obtain a hollow rotor having a relatively thin structure and satisfying the required strength and accuracy, and it is possible to significantly reduce the weight of the rotor.

In addition, since the thickness of each part of the rotor can be easily made uniform, the amount of deformation at the time of thermal deformation can be made uniform over the entire rotor, and the inconvenience of local strain generation can be avoided.

Furthermore, the material of each part of the rotor can be easily optimized, and by selecting a material that meets the required characteristics of each part, a rotor having excellent strength, accuracy, durability, etc. can be obtained.

[Brief description of drawings]

1 is a perspective view showing a method of assembling four plates according to an embodiment of the present invention, FIG. 2 is a perspective view of a well-shaped member assembled by the method of FIG. 1, and FIG. Is a perspective view of the rotor-shaped member joined to the square-shaped member of FIG. 2, FIG. 4 is a perspective view showing a method of joining both side plates to the rotor body of FIG. 3, and FIG. 5 is shown in FIG. FIG. 6 is a perspective view of a rotor that has been joined by the method shown in FIG. 6, FIG. 6 is a perspective view showing a method of joining rotor outer plates different from the method shown in FIG. 3, and FIG. 7 is a rotor body showing the next step of FIG. FIG. 1a, 1b, 1c, 1d ... plate material 2 ... slit 3 ... well-shaped member 4 ... vane grooves 5a, 5b, 5c, 5d ... rotor outer peripheral plates 6a, 6b ... shaft 7 ... rotor body 8a, 8b ... side plate 9 ... rotor 10 ... cylinder

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kenji Shimizu 1784-1 Uegamicho, Sano City, Tochigi Prefecture

Claims (3)

[Claims] 1. A hollow rotor body having a vane groove (4).
(7) and a shaft (6a, 6b) projecting from at least one side surface of the rotor body (7), a method for manufacturing a rotor for a rotary fluid pump, comprising four flat plate members (1
a, 1b, 1c, 1d) are assembled in a well shape to form a well-shaped member (3) having a vane groove, and then the rotor outer plates (5a, 5b, 5c, 5d) and side plates (8a, 8b) on both sides of the rotor body, which have shafts (6a, 6b) on at least one side thereof, are joined to each other. 2. The four plate members (1a, 1b, 1c, 1d)
), Two slits (2) are cut into each of them, and another plate is inserted into the slit (2) of each plate (1a, 1b, 1c, 1d) to form the well-shaped member (3). A method for manufacturing a rotor for a rotary fluid pump according to claim 1. 3. The well-shaped member (3), the rotor outer peripheral plate (5)
a, 5b, 5c, 5d) and hollow portions formed by side plates (8a, 8b) on both side surfaces of the rotor body, and holes for communicating the outside with the shafts (6a, 6b) and the side plates (8a).
, 8b) is provided, and then the joining is performed, the method for manufacturing a rotor for a rotary fluid pump according to claim 1 or 2.