JPH01125590A - Centrifugal jet pump - Google Patents

Abstract

PURPOSE:To facilitate the assembling and maintenance and improve the efficiency by forming part of a Venturi conduit on the surface of a pump cover and forming the remaining portion of the Venturi conduit on a Venturi cover. CONSTITUTION:An impeller 23 is stored in a pump casing 21. A half divided in the axial direction of a Venturi conduit is formed on a casing cover 27, and the remaining half of the Venturi conduit 35 is formed on a Venturi cover 37. When the impeller 23 is rotated, the water in a guide vane 28 is pressurized, part of it is discharged through a discharge port 41, the remainder passes an opening 29 and sprayed to the Venturi conduit 35 through a nozzle 31. The assembling and maintenance are thereby facilitated, and the efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a Hugal jet pump used for circulating hot water heated by a boiler.

Conventional technology Some Hugal jet pumps used for circulating hot water heated by boilers, etc. are equipped with a
As shown in the figure and FIG. 5, the casing part of the Hugal pump is stacked on top of the jet part, and the motor is placed on top of the casing part.

Hereinafter, a conventional example of such a Hugal jet pump will be explained with reference to FIGS. 4 and 5.

In FIGS. 4 and 5, 1 is a motor, which is mounted on the pump casing 2. In FIG.

3 is a polyte case, and an impeller 4 is housed in this case. 5 is a casing cover, and a jet portion 8 having a nozzle 6 and a venturi 7 is integrally formed on this casing cover 5. Further, the space between the pump casing 2 and the casing cover 5 is kept watertight and partitioned by a backing 9. A reinforcing plate 10 is made of a stainless steel plate and is sandwiched between the casing cover 5 and the backing 9 so as to cover the venturi 7. A suction channel 12 is provided in the pump casing 2 and communicates with the venturi 7 via a water suction hole 13 provided in the backing 9. In addition, the backing 9 is provided with a water hole 15 at a position facing the suction port 14 of the impeller 4, and the water hole 15 is provided so as to communicate the discharge port of the pollut case 3 with the pressure waterway 17 and the discharge port 18. 19 are provided.

In the conventional Hugal jet pump configured as described above, when the motor 1 rotates, the impeller 4 rotates, and the water inside the porlute case 3 is pressurized and discharged into the pressure waterway 17, and a part of the water is discharged. It is discharged from the discharge port 18, and the rest is discharged from the nozzle 6 to the venturi 7. As a result, the inside of the venturi 7 becomes negative pressure, the inside of the suction channel 12 also becomes negative pressure, and water is sucked in. Although the pressures of the nozzle 6 and the venturi 7 are extremely different, the reinforcing plate 10 prevents the backing 9 from deforming due to the pressure difference.

Problems to be Solved by the Invention In the above-mentioned Hugal jet pump, both the pump casing 2 and the pump cover 5 are open, and it can be produced by molding synthetic resin, so the number of manufacturing steps is small and maintenance is easy. However, the shape of the cross section of the nozzle 10 and venturi 7, which affects the performance, becomes semicircular, which is different from the ideal circular shape.For this reason, the performance cannot be sufficiently improved. In addition, reinforcing plate 1 was installed to withstand the pressure difference between nozzle 6 and venturi 7.
o is required.

The present invention solves the above-mentioned problems, and provides a Hugal jet pump that requires fewer assembly steps, is easy to maintain, has high performance, and has a small number of parts.

Means for Solving the Problems In order to solve the above problems, the Hugal jet pump of the present invention forms a part of the venturi on the surface of the pump cover, and forms the remaining part of the venturi on the venturi lid. A venturi was constructed by combining a venturi lid with a pump cover.

Effect: Because the venturi of the Hugal jet pump of the present invention is constituted by the pump cover and the venturi lid, it is easy to assemble and disassemble, and the cross section of the venturi can be made into an ideal shape.

EXAMPLE Hereinafter, an example of the Hugal jet pump of the present invention will be described with reference to FIGS. 1 to 3.

2o is a motor, which is attached on top of the pump casing 21. Reference numeral 22 denotes a guide plate, which is attached to a position facing the rear surface of the impeller 23.

A water suction port 24 is provided in the pump casing 21 and communicates with the venturi suction port 25 via a suction pipe 26. 27 is a casing cover, and a guide vane 28
are integrally formed. Furthermore, casing cover 27
is provided with an opening 29 which communicates with a nozzle 31 of the jet 30 . Further, 32 is a drain port that communicates with the jet 30 and whose center axis coincides with an extension of the center axis of the jet 30, and is blocked by a plug 33.

35 is a venturi pipe, which communicates with the suction port of the impeller 23 and is constituted by a casing cover 27 and a venturi lid 37. That is, the casing cover 27 is formed with a half of the venturi pipe 35 divided in the axial direction, and the venturi lid 37 is formed with the other half of the venturi pipe 35. The space between the casing cover 27 and the venturi lid 37 is sealed by a backing 38,
The space between the pump casing 21 and the casing cover 27 is sealed by a backing 39.

Since the extension of the central axis of the jet 30 and the central axis of the drain port 32 coincide, when manufacturing the casing cover 27, the side core passing through the drain port 32 is used to form the nozzle 31 with a circular cross section. be able to.

The operation of the Hugal jet pump of this embodiment configured as above will be explained.

When the motor 20 rotates, the impeller 23 rotates, and the water inside the guide vane 28 is pressurized and discharged into the pressure waterway 40. Part of the water is discharged from the discharge port 41, and the rest is discharged from the opening 2.
9 and is ejected from the nozzle 31 into the venturi pipe 35. As a result, the inside of the venturi pipe 35 becomes negative pressure, the inside of the suction pipe 26 also becomes negative pressure, and water is sucked in.

At this time, since the nozzle 31 and the venturi pipe 35 have a circular cross-sectional shape, the jet pump constituted by the jet 30 and the venturi pipe 35 is efficient.

Further, when assembling the Hugal jet pump of the present invention, the motor 20 is attached to the pump casing 21, the guide plate 22 is attached to the pump casing 21, the pump cover 27 is attached to the pump casing 21, and the venturi lid 37 is attached to the pump cover 21. Simply attach the .

Furthermore, when maintenance such as cleaning is required, maintenance can be performed simply by removing the pump cover 27 from the pump casing 21.

DETAILED DESCRIPTION OF THE INVENTION As described in the detailed description of the invention, the Hugar jet pump of the present invention includes a pump cover with a part of the venturi formed on the surface of the pump cover, a venturi cover with the remaining part of the venturi, and a venturi cover combined with the pump cover. Since the venturi is constructed by using the venturi, assembly is easy, maintenance such as cleaning is easy, and the cross section of the venturi can be made into an ideal shape, thereby increasing efficiency.

[Brief explanation of the drawing]

20... Motor 21... Pump casing 22... Guide plate 23... Impeller 24...
・Water intake port 25...Venturi suction port 26...
・Suction pipe line 27...Casing cover 28・
...Guide vane 29...Opening 3o...Jet
31... Nozzle 32... Drain port
33... Plug 35... Venturi conduit
37...Venturi lid 38...Backing
39... Name of backing agent Patent attorney Toshio Nakao and 1 other person! 1st school

Claims (1)

[Claims] A Hugal pump is housed in a pump casing, a pump cover with a part of a bench lily formed on its surface is attached to the front of the pump casing, and a bench lily lid with the remaining part of the bench lily formed on the surface is attached to the pump cover. A Hugal jet pump characterized by having a bench lily configuration by attaching it to the front.