JPS598676B2 - Submersible pump driven by pneumatic motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a submerged suspension pump driven by a pneumatic motor.

When manufacturing a submerged pump using synthetic resin, the objective is to solve the problems of conventional submerged pumps using electric motors and to make it possible to manufacture submerged pumps using synthetic resin.

The structure of this invention is that in a spiral type submersible pump with a vertical impeller shaft, a pneumatic motor is installed in a box provided on the upper side of the pump casing, and the pump impeller is attached to an extension of the motor shaft. None, it has a means for introducing a part of the pressurized air for driving the motor into an air reservoir in the box, a means for guiding the introduced pressurized air to the lower part of the bottom plate of the box, and a means for releasing it to the outside from the lower part of the bottom plate. In a submersible pump with a vertical impeller shaft and a centrifugal submersible pump with a vertical impeller shaft, the pneumatic motor is installed in a box provided above the pump casing, and the pump impeller is attached to an extension of the motor shaft. , having a means for introducing a part of the pressurized air for driving the motor into an air reservoir in the box, a means for guiding the introduced pressurized air to the lower part of the bottom plate of the box, and a means for releasing it to the outside from the lower part of the bottom plate, At the bottom of the motor installation box, place the rotary ring made of flexible material on the part through which the motor shaft penetrates, with the rotating ring made of flexible material facing upward and touching the bottom of the motor installation box. It's in the pump.

Since the present invention has the above structure, a part of the pressurized air for driving the motor is filled in the interior of the motor installation box,
The pump driving pneumatic motor can be prevented from being immersed in the liquid by blowing it out into the liquid from the gap in the penetrating part of the motor shaft.

Furthermore, by fitting the rotating ring to the lower surface of the motor installation box, it is possible to prevent liquid from flowing back into the motor installation chamber even when blowing air cannot be obtained due to the air pressure being stopped.

To explain this invention based on drawings of embodiments, the first
In the figure, the air supply pipe 5 exhaust pipe 6 is connected to the box 2 in the liquid from outside the liquid surface.
A pump casing 10 is connected to the pneumatic motor 1 inside the box, and the pneumatic motor is sealed inside the box, and the motor shaft 4 penetrates the bottom plate 3 of the box and is installed below the box.
A casing 10 is provided along the outer periphery of the impeller 10, and a discharge pipe is provided in a part of the casing 10, which is connected to a liquid feeding pipe 17.

The air supply pipe 5 penetrates the box 2 submerged in the liquid and is connected to the motor inside the box.The air supply pipe 5 is provided with a blowout hole 7 inside the box as a means for introducing pressurized air into the air reservoir 12, and is connected to the motor inside the box. As a means for guiding the pressurized air introduced into the air reservoir 12 to the lower part of the bottom plate, there is a gap between the hole 8 that penetrates the bottom plate and the motor shaft penetration part, and as a means for passing the pressurized air to the bottom of the bottom plate and discharging it to the outside, there is a It has a hole 9 that passes through the connecting position.

The pressurized air introduced by the air supply pipe is connected to a motor in the box and discharged to the atmosphere through an exhaust pipe 6.

The = part of the pressurized air guided by the air supply pipe 5 is ejected into the air reservoir from the outlet of the air supply pipe in the box, filling the box, keeping the pressure inside the air reservoir higher than the liquid pressure in the water, and penetrating the bottom plate. The air is ejected from the gap between the hole 8 and the motor shaft to prevent the liquid from entering, and the ejected air passes through the hole 9 connected to the outside at the bottom of the bottom plate and dissipates in the form of bubbles.

The liquid sucked in by rotating the motor is discharged into the discharge pipe 1.
6 and a liquid sending pipe 17 to a predetermined location.

With pressurized air being supplied, the valve 14 installed in the exhaust pipe 6 is closed and the pump is submerged into the liquid.

The pressurized air stops without driving the motor inside the box and does not send liquid.

At the time of starting, by opening the valve 14 of the exhaust pipe 6 under air supply conditions, a flow of pressurized air is generated, the motor is driven, and the pump can be started.

The embodiment of the second invention shown in FIG. 2 is constructed as described above in the embodiment shown in FIG. By attaching the rotary ring 11 made of material to the motor shaft with the hakama facing upward and in contact with the bottom surface of the motor installation box, it is possible to prevent air from blowing out due to air pressure being stopped, or when the air supply pipe 5 When the flow of pressurized air is stopped by closing the provided valve 15, even if the pressure inside the box drops, the hakama of the rotating ring will stick to the bottom plate due to the hydraulic pressure, and the liquid will flow back into the motor installation chamber. It prevents this and acts effectively.

For the above reasons, it rotates safely underwater, there is no risk of liquid intrusion, and because it is air-driven, it does not generate as much heat as an electric motor.
Since there is no spark, there is no electric shock and it can be used as an explosion-proof device.

The speed of the pneumatic motor can be easily adjusted by operating a valve installed in the piping, and the speed can be changed without the need for a special transmission device.

Even if there is an overload, the rotational speed will only decrease, and even if the impeller is fixed by solid objects, seizure will not occur.

Since there is no impact during startup and there is no special mechanism in the shaft seal, the structure is simple and can be manufactured in a small, lightweight, and inexpensive manner.

For chemical solutions that require corrosion resistance, casings, boxes,
Pumps can be manufactured using corrosion-resistant synthetic resins such as hard vinyl chloride and glass fiber reinforced plastics for impellers, etc.

As explained above, this invention operates by filling a part of the motor drive pressurized air into the interior of the motor installation box and blowing it out into the liquid from the gap of the motor shaft through-hole. It prevents liquid from penetrating, rotates stably, and is easy to operate and transfer liquid.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a submerged pump. FIG. 2 is a vertical cross-sectional view of the rotating ring attached around the bottom plate and motor shaft. 1... Pneumatic motor, 2... Box, 3... Bottom plate, 4
...Motor shaft, 5...Air supply pipe, 6...Exhaust pipe,
7... Ejection hole, 8... Hole, 9... Hole, 10...
Casing, 11... Rotating ring, 12... Air pocket,
13... Impeller, 14... Valve, 15...
Valve, 16...discharge pipe, 17...liquid feeding pipe.

Claims (1)

[Claims] 1. A structure in which a pneumatic motor is installed in a box provided above the pump casing in a spiral submersible pump with a vertical impeller shaft, and the pump impeller is attached to an extension of the motor shaft. A means for introducing a part of the pressurized air for driving the motor into an air reservoir in the box, a means for guiding the introduced pressurized air to the lower part of the bottom plate of the box, and a means for releasing it to the outside from the lower part of the bottom plate. A submerged pump characterized by: 2 In a spiral type submersible pump with a vertical impeller shaft, a pneumatic motor is installed in a box provided on the upper side of the pump casing, and the pump impeller is attached to an extension of the motor shaft. It has a means for introducing a part of the pressurized air into an air reservoir in the box, a means for guiding the introduced pressurized air to the lower part of the bottom plate of the box, and a means for releasing it to the outside from the lower part of the bottom plate of the box. A liquid submersible device characterized in that a rotary ring made of a flexible material has a hakama of a rotating ring made of a flexible material facing upward in the part through which the motor shaft passes through the lower surface, and is fitted onto the motor shaft so as to be in contact with the lower surface of the motor installation box. pump.