JPS6131686A - Water sealing pump - Google Patents

Abstract

PURPOSE:To increase mechanical strength with simple structure and to facilitate inspection by integrating a port plate and the fixing section to motor side while providing an intake path and shaft seal device at the motor side of said plate thereby reducing the number of parts and the joint face. CONSTITUTION:A tubular section 25a to be fixed to the endface of motor at the end and another tubular section 25b surrounding the end section of rotary shaft 22 fitted with an impeller 3 while provided with a shaft seal device 11 at the inside are formed integrally on the side face of a port plate 25. An intake path 28a, an exhaust path 28b and a working water injection path 29 are bored from the outercircumference between said tubular sections 25a, 25b. With such arrangement, the number of parts and the joint face are reduced to reduce the axial size while to prevent leakage of working water and since the load of external piping is applied in the vicinity of fixing section of motor 21, mechanical strength of pump is increased. Further, inspection work can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a water ring pump that has a simple structure and can be easily inspected.

[Prior art and its problems]

A conventional example of a water ring pump will be explained based on Fig. 5.
In this figure, an Elmo-shaped impeller 3 fitted on the end of a rotating shaft 2 that protrudes from the end face of W, thtml is eccentrically surrounded by a cylindrical casing 4, and a disk-shaped impeller 3 is attached to one end face of the casing 4. side cover 6 via the port plate 5 of
is installed.

This side cover 6 has an air intake passage 8 communicating with the pump chamber 7.
, an exhaust path and a working water injection path 9 (not shown) are provided,
External piping (not shown) is connected to each. The working water injected into the pump chamber 7 from the injection path 9 forms a water ring 10 that seals the gap between the outer circumference of the impeller 8 and the casing 4 due to the centrifugal force caused by the rotation of the impeller 8, and in this state, the water ring 10 closes the gap between the outer circumference of the impeller 8 and the casing 4. Air is sucked in from the pump chamber 7I, compressed, and discharged from the exhaust passage. The casing 4 is attached to the end surface of the electric motor 1 at a local portion outside the other end surface, and a shaft sealing device 11 is provided in the portion of the casing 4 through which the rotating shaft 2 passes. When inspecting the impeller 8, the external piping is removed, and then the side cover 6 and port plate 5 are removed.

This structure has disadvantages in that it takes a lot of effort to remove the piping when inspecting the impeller 8, and the load of the piping is applied to the tip of the pump, so it is necessary to increase the mechanical strength of the pump. Ta.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide a water ring pump that has a simple structure, has increased mechanical strength, and can be easily inspected.

[Key points of the invention]

In order to achieve the above object, the present invention surrounds an impeller with a disc-shaped port plate and a cover to form a pump chamber, and includes a cylindrical part attached to the end face of the motor at the tip on the side of the port plate. The structure is simplified by integrally forming a cylindrical part that surrounds the end of the rotating shaft and having a shaft sealing device inside, and providing an air intake passage, etc. that communicates the pump chamber with the outside between the two cylindrical parts. This is what I did.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, and parts indicated by the same reference numerals as in FIG. 5 are the same parts. In this figure, a pump chamber 7 is formed by surrounding an impeller 8 with a disk-shaped port plate 25 and a cover 26. The side surface of the port plate 25 includes a cylindrical part 25a whose tip end is attached to the end face of the electric motor 21, and a cylindrical part 25b which surrounds the end of the rotating shaft 22 on which the impeller 8 is fitted and has the shaft sealing device 11 inside. are integrally formed, and these two cylindrical parts 25& and 25b
In between, an intake passage 28a, an exhaust passage 28b and a working water injection passage 29 shown in FIG. 2 are provided by drilling holes from the outer periphery. The intake passage 28a and the exhaust passage 28b are an intake port 250 and an exhaust port 25d provided in the port plate 25.
The injection passage 29 communicates with the pump chamber 7 through the small diameter cylindrical portion 25b. The cover 26 is attached to the side surface of the port plate 25 on the impeller 8 side, and an annular sealing backing 80 is inserted into the joint surface.

According to the above embodiment, the port plate 25 and the motor 21 are attached to each other in one piece, and the intake passage 28a, etc. and the shaft sealing device 11 are provided on the motor 21 side of the port plate 25, thereby reducing the number of parts and the joint surface. It is possible to reduce the size in the axial direction and prevent the leakage of working water, and since the load of the external piping is applied near the part where the electric motor 21 is attached, the mechanical strength of the pump is increased. Furthermore, since there is no need to remove the piping when inspecting the impeller 8, inspection work becomes easier.
Moreover, by removing the cover 26, the gap between the impeller 8 and the port plate 25 can be directly inspected and measured.

In FIG. 8 showing another embodiment, the intake path vane a and the exhaust path 88b communicate with the arcuate intake port 85Q and the exhaust port 85d of the port plate 85 in the entire circumferential direction as shown in FIG. It is cast into an inverted funnel shape. According to this embodiment, it is possible to reduce ventilation resistance and increase the strength of the core during casting, and also to appropriately increase the distance between the external piping connection port 356 and 85f provided in the large diameter cylindrical portion 85B. It can also make construction easier.

〔Effect of the invention〕

r (J'1, 8th, G, upper, 1 rope-type pump, surround the impeller with a disk-shaped port plate and cover to form a pump chamber, and attach it to the side of the port plate. An intake passage that communicates the pump chamber with the outside is provided between the integrally formed cylindrical part for mounting the motor and the cylindrical part for mounting the shaft sealing device, resulting in a compact structure with high mechanical strength. It is possible to increase the number of parts and facilitate inspection work, and also to prevent leakage of working water by reducing the number of parts and joint surfaces.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view of an embodiment of the present invention, FIG. 2 is a side view of the port plate of FIG. 1, FIG. 8 is a partial vertical sectional view of another embodiment of the invention, and FIG. This figure is a side view of the port plate shown in FIG. 3, and FIG. 5 is a vertical sectional view of the main part of the conventional example. 3... Impeller, 7... Pump chamber, 11... Shaft sealing device, 21... Electric motor, 22... Rotating shaft, 25.85
...Port plate, 25a, 25b, 85B...
Cylindrical part, 26-...Cover, 2sa1 asa...
Intake path, 28b, '88b...exhaust path, 29...injection path. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1) An impeller fitted to the end of a rotating shaft protruding from the end face of the motor is surrounded by a disk-shaped port plate and a cover to form a pump chamber, and the end face of the motor is surrounded by a disc-shaped port plate and a cover, and the tip is attached to the side of the port plate. an intake passage which integrally forms a cylindrical part to be attached to the rotating shaft and a cylindrical part surrounding the end of the rotating shaft and having a shaft sealing device therein, and communicating the pump chamber with the outside between the two cylindrical parts; A water ring pump characterized by being provided with an exhaust passage and an operating water injection passage.