JPS62195496A - steel plate 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 [Field of Application of the Invention] The present invention relates to a pump made of steel plate formed by press working, and particularly to the structure of a casing of a centrifugal pump.

[Background of the invention]

As a conventional technology for steel plate pumps, Japanese Patent Application Laid-Open No. 54-316
There is a known technique disclosed in Japanese Patent No. 03.

In this known technology, the volute casing that defines the volute chamber of the pump is press-formed from a metal plate, and a metal drainage plate is attached by welding to the volute casing immediately after the discharge port in the rotational direction of the impeller. It has the advantage of being easier to manufacture.

However, if the drain plate is welded to the volute casing, the welding point is located in the liquid flow path, so
Depending on the type of liquid, there is a risk that the welding location may corrode, and to prevent this, the type of liquid must be limited.

[Purpose of the invention]

In view of the above circumstances, the present invention provides a steel plate pump that can prevent corrosion regardless of the type of liquid used, improve reliability, and is versatile for the liquid used. It's about doing.

[Summary of 41f of the Invention] The present inventor has focused on the fact that corrosion is unavoidable if there is a welded part in the liquid distribution path as described above, and therefore decided to eliminate the welded part in the liquid distribution path, and At least the components facing the liquid flow path are fitted and assembled.

That is, the present invention provides a pump casing in which a suction port and a discharge port are provided in a cross direction, an impeller fixed to a rotating shaft of an electric motor and arranged inside the pump casing, and an impeller fitted in the pump casing. The end cover that separates the motor and the pump, and the end cover of the pump casing are fitted and installed in different positions, and one blade +
A partition plate that partitions the suction side and the discharge side of the pump casing, and a partition plate that fits between the partition plate and the end cover of the pump casing, and is arranged in the outer circumferential direction of the impeller; A volute casing having a discharge part connected to a 1L discharge side and defining a volute chamber whose cross-sectional area gradually increases from immediately after the discharge part to the discharge part in the rotational direction of the vane +1; The end cover is fastened to the fixed part of the motor using bolts, and this structure eliminates welding points in the liquid flow path, so it will not corrode regardless of the type of liquid. can be prevented, and reliability can be increased accordingly.
It can provide versatility for liquids.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view showing one embodiment of the present invention.

2 is a sectional view taken along the line ■--■ in FIG. 1, FIG. 3 is a perspective view showing the discharge part of the volute casing, and FIG. 4 is a mounting state in which the bolts are tightened.

The steel plate pump 10 of the embodiment is assembled integrally with the electric motor 1 as shown in FIG. 1, and includes a pump casing 11, an impeller 12, an end cover 13, a partition plate 14, and a volute. It includes a casing 15 and a fastening mechanism 16.

The pump casing 11 is press-molded, for example, from stainless steel, and has a side plate 11 formed in a disc shape.
A bulging portion 11b is formed in a curved manner on the outer periphery of a, and a cylindrical outer circumferential wall lie extending in the axial direction is formed on the outer periphery of the bulging portion 11b.

Further, the pump casing 11 is provided with a suction port 17 and a discharge port 18 in a cross direction. The suction port 17 is configured such that the other end of a suction pipe 19 having a flange at one end is fitted into a hole provided in the side plate 11a of the pump casing 11 and attached by outer circumferential welding. Discharge port 1
8 has a flange at one end, and the other end of a discharge pipe 20 is abutted around a hole provided in the cylindrical outer peripheral wall 11c of the pump casing 11, and is attached by outer periphery welding.

The impeller 12 is fixed to the rotation shaft 2 of the electric motor 1 via the boss 3 fitted thereon, and is placed inside the pump casing 11. When rotated by the drive of the electric motor 1, the impeller 12 draws external liquid into the suction port. The liquid is sucked in through 17, pressurized by centrifugal force, and discharged to a discharge port 18.

The end cover 13 is fitted and attached to the cylindrical outer circumferential wall of the pump casing 11, and the end cover 13 is attached to the cylindrical outer circumferential wall of the pump casing 11.
O is divided into sections. That is, the end cover 13 has 1
For example, stainless steel or the like is press-molded, and has a cylindrical wall 1.3a on the outer periphery that can fit with the cylindrical outer peripheral wall lie of the pump casing 11, and an overhang on the inner periphery that can fit the shaft sealing device 4 of the electric motor 1. The cylinder ji13a is inscribed and fitted into the cylindrical outer circumferential wall 11b, and the projecting edge 13b is fitted to the shaft sealing W4 to form a ring-shaped body. and electric motor 1 are separated.

The partition plate 14 is a cylindrical outer peripheral wall 11 of the pump casing 11.
c, and partitions the suction side and the discharge side of the impeller J2. The partition plate 14 is formed into an annular plate made of, for example, stainless steel, and is fitted with the outer circumferential edge inwardly contacting the cylindrical outer circumferential wall 11c while being in contact with the side wall 11a of the pump casing 11. The suction side of the impeller 12 is inserted through the hole to separate the suction side and the discharge side of the impeller 12. Note that a packing 41 is interposed between the outer peripheral edge of the partition plate 14 and the bulging portion 11b of the side wall 11a.

The volute casing 15 is fitted and attached between the end cover 13 and the partition plate 14 of the pump casing II, and is arranged in the outer circumferential direction of the impeller 2. That is,
As shown in FIGS. 1 to 3, the volume casing 15 includes a volute member 21 formed into a cylindrical body with a stepped cross section, a guide plate 22 having an annular shape, and a spacer 23 having a cylindrical shape. The guide plate 22 is fitted into the cylindrical outer peripheral wall 1, Ic of the pump casing 11 in contact with the end cover 13, and the outer periphery of the volute member 21 is fitted into the cylindrical outer peripheral wall 11c, and the inner The periphery is partition plate 1
4, a volute member 20 is disposed between the partition plate 14 and the guide plate 22, and a spacer 23 is fitted to the cylindrical outer peripheral wall 11c so that the outer peripheral edge of the volute member 21 and the outside of the partition plate 14 are connected to each other. A spacer 23 is arranged between the peripheral edges.

In addition, the volute casing I5 includes the volute member 2
A volute chamber 25 is formed by a space defined by a guide plate 22 and a recess 24 provided at a position facing the discharge side of the impeller j2 in the impeller j2. The volute chamber 25 is connected to the impeller 1 as shown in FIG.
Immediately after the discharge part 26 communicating with the discharge port 18 of the pump casing 11 in the rotation direction A of the pump casing 11, the discharge part 2
It is formed so that the cross-sectional area gradually increases as it reaches 6. Therefore, the volute chamber 25
The space between the concave portion 24 and the guide plate 22 of 1 is smallest at one end of the flat portion 27 formed in the concave portion, and increases from there toward the other end of the flat portion 27 along the rotational direction of the impeller 12. It is gradually being expanded.

As shown in FIGS. 2 and 3, the discharge portion 26 is provided on the other of the plane portion 27 of the volute member 21 and the dogleg shape 28 of the spacer 23 so as to communicate with the discharge port 18 of the pump casing 11. It consists of a cutout.

For installation, the bolt 16 has a hook portion 16a formed at one end so as to be hooked onto the bulge 11b of the pump casing 11, and the hook portion 16a is hooked onto the bulge 11b, and the other end is attached to the end of the electric motor 1. The washer 30 is inserted into the flange 6 formed on the bracket 5. Pump casing 11 and end cover 13 are fixed to end bracket 5 by tightening nuts 31. that time,
Installation is done by hook 16a of bolt 16 and end bracket 5
The pump casing 11 and the end cover 13 are sandwiched between the pump casing 11 and the end cover 13 in the axial direction. End cover, partition plate 14. The volute casings 15 are tightly assembled to each other.

Note that a bagin 42 is interposed between the projecting edge 13b of the end cover 13 and the end bracket 5 so as to keep the inside of the pump 10 airtight. Further, legs 43 are attached to the pump casing 11.

In the steel plate pump 10 of the embodiment, when the impeller 12 is rotated by the drive of the electric motor 1, the liquid in the impeller 12 is pressurized by the centrifugal force of the impeller and is discharged from the discharge side 12b. Along with this, the intake port 1 of the pump casing 11
The liquid sucked from the pump 7 passes through the impeller 12 and the volute casing 15, and is then discharged from the discharge port 18 of the pump casing 11.

At that time, an end cover 13. Partition plate 14. Since the volute casing 15 is attached only by fitting, there are no welding points in the liquid flow path. Therefore, since there is no welding point in the liquid distribution path, compared to the conventional example in which there is a welding point in the distribution path,
Corrosion of the welded area depending on the type of liquid can be prevented, and the type of liquid does not matter.

Furthermore, since the pump as a whole is only welded at the attachment portions of the suction port 17 and the discharge port 18, distortion and deterioration of the material caused by welding can be prevented as much as possible.

Furthermore, the attachment is performed using a hook portion 16a provided on the bolt 16.
and the end bracket 5 of the electric motor 1.

Pump casing 11. Partition plate 14. Since the volute casing 15 is held in the axial direction, the axial rigidity can be reliably increased compared to the conventional method in which flanges provided on the pump casing and the end cover are tightened, and the volute casing 15 can be clamped in the axial direction. Can also be used with large pumps.

〔Effect of the invention〕

As described above, according to the present invention, the partition plate, the volute casing, and the end cover are each fitted and attached within the pump casing, and there are no welding points in the liquid flow path, so that the liquid flow It has the advantage of being able to prevent corrosion regardless of the type, thereby increasing reliability and providing a pump that is versatile for liquids.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
FIG. 3 is a perspective view showing the discharge part of the volute casing, and FIG. 4 is a sectional view showing the state in which bolts are tightened during installation. 10... Pump, 11... Pump casing, 12
... Impeller, 13... End cover, 14... Partition plate, 15... Volute casing, 16... Mounting with bolts, 1... Electric motor, 2... Rotating shaft, 5...・
・End bracket. Agent Patent Attorney Tadashi Akimoto Figure 2 2, 18 Figure 3, 26 Figure 4

Claims (1)

[Claims] 1. A pump casing in which a suction port and a discharge port are provided in a cross direction, an impeller fixed to the rotating shaft of the electric motor and placed inside the pump casing, and an impeller that is fitted and attached to the pump casing, An end cover that divides the pump into two parts, a partition plate that fits and is installed in a different position from the end cover of the pump casing and partitions the impeller's suction side and discharge side, and a partition in the pump casing. It is fitted and attached between the plate and the end cover, is arranged in the direction of the outer circumference of the impeller, has a discharge part connected to the discharge port of the pump casing, and is located immediately after the discharge part in the direction of rotation of the impeller. A pump made of steel plate, characterized in that it is equipped with a volute casing defining a volute chamber whose cross-sectional area gradually increases as it reaches a discharge part, and a mounting bolt that fixes the pump casing and end cover to a fixed part of an electric motor.