JPH05172078A - Motor-driven pump - Google Patents

Abstract

PURPOSE:To provide a motor-driven pump wherein water does not leak from packing even under high water pressure by preventing deformation of a cover between screws. CONSTITUTION:An annular reinforcing rib 5c is provided near the outer periphery of the upper surface of the cover 5 of a motor-driven pump 1 in such a manner that a screw seat 5d is joined thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pump.

[0002]

2. Description of the Related Art A conventional electric pump will be described with reference to FIGS. 3 and 4, taking a non-self-priming spiral pump as an example. 3 is a plan view of a conventional electric pump, and FIG. 4 is a side sectional view of the electric pump of FIG.

In FIG. 3, a conventional electric pump comprises a vertical electric motor 1 and a spiral pump 3 fixed to the upper end surface thereof by a plurality of screws 2.

In FIG. 4, the spiral pump 3 described above is used.
Is housed in the casing 4; a casing 4 having a discharge port 4a formed tangentially on the outer peripheral surface; a cover 5 covering an upper opening of the casing 4; and a cover 5 having a suction port 5a in the center. It is composed of an impeller 7 fixed to the rotary shaft 6 of the vertical electric motor 1. Further, in order to prevent water leakage from the rotary shaft 6 described above, a mechanical seal 8 is attached to the inner circumference of the casing 4, and a packing 9 is attached to seal between the casing 4 and the cover 5. Further, a draining plate 10 is mounted near the lower part of the casing 4 so that water leaking from the rotary shaft 6 does not enter the vertical electric motor 1.

Since the screws 2 are attached, the casing 4 and the cover 5 are provided with screw holes 4b for attachment.
And 5b are provided respectively.

The operation of the electric pump configured as described above will be described. First, at the time of start-up, water and air flow in from the suction port 5a of the cover 5, the rotation of the impeller 7 causes the mixed water of water and air to be discharged from the discharge port 4a to the outside, and the air in the casing 4 is discharged. To be done. Next, when water flows in through the suction port 5a and enters a full-scale water delivery state, the water is discharged from the discharge port 4a to the outside by the rotation of the impeller 7.

[0007]

However, in the above-mentioned structure, the water supply pressure to the electric pump has increased in recent years and a high water pressure is applied to the cover 5, resulting in deformation of the sealing surface of the packing 9 in the cover 5. There was a problem that a gap was created and water leakage occurred.

An object of the present invention is to solve the above problems and to provide an electric pump which prevents deformation of the cover between screws and prevents water from leaking from the packing even under high water pressure.

[0009]

In order to solve the above-mentioned problems, the electric pump of the present invention has a cover near the outer periphery of the upper surface.
An annular reinforcing rib is provided to connect the screw seats.

[0010]

With the above structure, the rigidity of the cover is improved, so that the cover is prevented from being deformed even when a high water pressure is applied, and the water does not leak.

[0011]

Embodiments of the present invention will be described with reference to FIGS.

FIG. 1 is a plan view of an embodiment of an electric pump according to the present invention, and FIG. 2 is a side sectional view of the embodiment of FIG.

In both figures, the present embodiment differs from the conventional example shown in FIGS. 3 and 4 in that an annular reinforcing rib 5c is formed near the outer periphery of the upper surface of the cover 5 so as to connect a screw seat 5d. This is the point where Others are the same as in the conventional example, and corresponding components are designated by the same reference numerals and the description thereof is omitted.

Since the basic operation of the electric pump constructed as described above is the same as that of the conventional example, its explanation is omitted.
However, when a high water pressure is applied, the rigidity of the cover 5 is increased by the reinforcing ribs 5c, so that the cover 5 is not deformed, and accordingly, the water does not leak from the packing 9.

[0015]

As described above, according to the present invention,
Since the reinforcing ribs provided between the screw seats increase the rigidity, the cover does not deform even when a high water pressure is applied, so that it is possible to provide a highly reliable electric pump in which water does not leak from the packing. .

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of an electric pump according to the present invention.

FIG. 2 is a side sectional view showing an AOB section of the electric pump of FIG.

FIG. 3 is a plan view of a conventional electric pump.

FIG. 4 is a side sectional view showing a C-O-D section of FIG. 3.

[Explanation of symbols]

1 ... Vertical electric motor, 2 ... Screw, 3 ... Whirlpool pump,
4 ... Casing, 4a ... Discharge port, 4b, 5b ... Screw hole, 5 ... Cover, 5c ... Reinforcing rib, 5d ... Screw seat, 6 ... Rotating shaft, 7 ... Impeller, 8 ... Mechanical seal, 9 ... Packing, 10 ... Drainer.

Claims (1)

[Claims] 1. An electric pump in which a pump, in which an impeller is housed in a cover attached to a casing via packing, is connected to a casing of an output end surface of an electric motor by a plurality of screws, and the vicinity of an outer periphery of an upper surface of the cover. The electric pump is characterized in that an annular reinforcing rib for connecting the screw seat is provided on the.