JP6947761B2 - Pump device - Google Patents

Description

The present invention relates to a pump device.

As a conventional pump device, there is one shown in Patent Document 1. This type of pump, which consists of a combination with a jet pump provided on the suction side of the centrifugal pump, constantly supplies a part of the pressure water discharged from the centrifugal pump during operation to the jet pump. When this type of pump is used for shallow wells, a jet pump with a check valve is directly connected to the suction side of the centrifugal pump, that is, the suction side of the pump device to effectively increase the pressure. It is also used as a self-priming pump, and has the feature that it can pump water even when air is mixed in the suction pipe at the initial stage of installation or due to falling water.

Japanese Unexamined Patent Publication No. 60-111087

Since it is also used as a self-priming pump as described above, a pump device having stable self-priming performance is desired even when air is mixed in the suction pipe at the initial stage of installation or due to falling water.

An object of the present invention is to provide a pump device having stable self-priming performance.

In order to achieve the above object, the present invention has a casing, a casing cover serving as a lid of the casing, a guide vane, a casing cover pressure port for supplying pressure water to a jet pump, and air in the casing. In a pump device including a discharge port for exhausting, the discharge port is located upward, the guide vane has a plurality of guide vane outlets, and among the plurality of guide vane outlets, the casing cover pressure port and the casing cover pressure port. The guide vane outlet located nearby is used as a proximity guide vane outlet, a separation plate is provided between the casing cover pressure port and the proximity guide vane outlet, and the separation plate is projected from the casing cover side. do.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a pump device having stable self-priming performance.

It is a vertical sectional view of the pump device which concerns on one Example of this invention. FIG. 5 is a perspective view of a pump device with an outer cover removed according to an embodiment of the present invention. FIG. 5 is a perspective view in which a jet pump is directly connected to the suction side of a pump device from which the cover has been removed according to an embodiment of the present invention. FIG. 5 is a cross-sectional view in which a jet pump is directly connected to the suction side of a pump device according to an embodiment of the present invention. FIG. 5 is a front view with the casing cover removed according to an embodiment of the present invention. It is a partial cross-sectional view which concerns on one Example of this invention and was seen from the front with the separation plate attached state. It is sectional drawing which concerns on one Example of this invention and was seen from the plane (above) in the state which separated plate is attached. It is a partial cross-sectional view seen from the side surface (left side) with the separation plate attached state which concerns on one Example of this invention. FIG. 5 is a perspective view in which a separation plate is formed on a casing cover according to an embodiment of the present invention.

Hereinafter, the outline of the configuration of the pump device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

This embodiment is characterized in that a separation plate 30 is provided between the pressure port 75 of the casing cover 14 and the proximity guide vane outlet 13b.

The pump device 100 is a control equipped with a pneumatic pressure tank 1, a pump driving motor 2 arranged on the pneumatic pressure tank 1, and a speed control device for shifting the rotational speed of the pump driving motor 2. A substrate 3 and an outer cover 4 for covering them are provided.

In the pump section, a pump driving motor 2 is configured in a casing 11 that also serves as a spiral chamber, and an impeller 12 is screwed onto a shaft 2a of the pump driving motor 2. A guide vane 13 is fixed to the casing 11 with screws or the like on the outer circumference of the impeller 12.

A casing cover 14 is provided on the front surface of the casing 11 to cover the casing 11. The casing cover 14 has a suction flange 15 that serves as a suction port for pumped water, and a part of the pumped water whose pressure is increased by the flange packing 40, the impeller 12, and the guide vane 13 that water-seals the casing 11 and the suction flange 15. Is provided with a pressure flange 16 for returning to the suction side (jet pump 70).

A screw-in type priming water supply tap 17 is provided on the upper portion of the casing 11. The priming water supply plug 17 is removed to perform priming.

When the power of the pump device 100 is turned on and the pump device 100 is operated, the pumped water is discharged from the discharge pipe via the discharge flange 5, and when the flow path connected to the discharge pipe is closed, the downstream side from the discharge pipe. The pressure of the pump rises, the pressure sensor 6 operates, and the pump driving motor 2 stops.

FIG. 3 shows a jet pump 70 directly connected to the suction side of the pump device when used in a shallow well. At this time, the suction flange 15 and the pressure flange 16 described above in FIG. 2 are removed. Further, the jet body 71 has a built-in connection portion 72 for connecting the suction pipe and a check valve 73 for preventing the backflow of the pumped water when the pump is stopped.

Next, the pressure increasing action when directly connected to the suction side of a jet pump having a check valve when used for a shallow well will be described with reference to FIG. 4, and the self-sucking action will be described with reference to FIG.

As shown in FIG. 4, the jet pump 70, which is directly connected to the suction side of the pump device, collects a part of the pumped water whose pressure is increased by the impeller 12 and the guide vane 13 (hereinafter referred to as the pressure water 74) in the casing cover 14. It is constantly supplied to the jet pump 70 from the pressure port 75 provided in. The pressure water 74 supplied to the jet pump 70 is jetted at high speed as jet water from the nozzle 76 and guided to the Venturi 77. At this time, since the pressure around the nozzle 76 is lowered, the water on the water source side 78 is also sucked into the venturi 77 and the pressure is increased, so that the pressure inside the suction side flow path 15a is also high.

Subsequently, the self-priming action will be described with reference to FIG.

At the initial stage of pump installation, when the impeller 12 is rotated after removing the priming water supply plug 17 and injecting priming water into the casing 11, the air-water mixture 32 in which the air on the suction side and the priming water are mixed guides the pump. It is discharged from the vane outlet 13a and the proximity guide vane outlet 13b. After the discharged air-water mixture 32 is separated into air-water in the casing 11, air is exhausted from the casing discharge portion 11a.

Further, a part of the water for which the air-water separation is not completed is returned to the lower part of the casing 11 and becomes the pressure water 74 supplied to the jet pump 70 through the pressure port 75 of the casing cover 14, and is used again for the self-priming action. ..

At this time, in the pump device 100 of the conventional example, in addition to the plurality of guide vane outlets 13a, the air-water mixture 32 containing a large amount of air discharged from the proximity guide vane outlet 13b close to the pressure port 75 is directly directed to the pressure port 75. Since it flows in and is supplied to the jet pump 70, there is a risk that the self-priming action will be reduced.

Next, this embodiment will be described with reference to FIGS. 6 to 9.

In this embodiment, by forming the separation plate 30 between the proximity guide vane outlet 13b close to the pressure port 75, the air-water containing a large amount of air discharged from the proximity guide vane outlet 13b close to the pressure port 75. It is possible to prevent the mixed liquid 32 from directly flowing into the pressure port 75, and the self-priming action is improved as compared with the conventional pump device.

Further, as shown in FIG. 7, the pressure port 75 and the proximity guide vane outlet 13b adjacent to the pressure port 75 have an opening 31 so that the water that collides with the separation plate 30 and is separated into air and water can flow into the pressure port 75. It has become.

The separation plate 30 described above may be integrated with or separate from the casing cover 14, the casing 11, and the guide vane 13. Further, although the separation plate 30 is projected from the casing cover 14 side in FIGS. 8 and 9, it may be projected from the casing 11 side, or may be divided and projected from both the casing cover 14 side and the casing 11 side. ..

The pump device with a pneumatic pressure tank has been described in detail above, but it goes without saying that the same effect can be obtained with a so-called non-automatic pump without a pressure tank, in addition to the pump device with an accumulator type pressure tank. be.

1 Pneumatic pressure tank 2 Pump drive motor 2a Shaft 3 Control board 4 External cover 5 Discharge flange 5a Discharge flow path 6 Pressure sensor 11 Casing 11a Casing discharge port 12 Impeller 13 Guide vane 13a Guide vane outlet 13b Proximity guide Vane outlet 14 Casing cover 15 Suction flange 16 Pressure flange 17 Boiling water supply tap 30 Separation plate 31 Opening 32 Air-water mixture 70 Jet pump 71 Jet body 72 Connection 73 Check valve 74 Pressure water 75 Pressure port 75a Increased pressure Water 76 Nozzle 77 Ventury 78 Suction port

Claims (3)

A casing, a casing cover as a cover of the casing, and a guide vane, the pump device comprising a casing cover pressure port for supplying pressurized water to the jet pump, and a discharge port for exhausting air in said casing ,
The discharge port is located upward, the guide vanes having a plurality of guide vanes outlet, among said plurality of guide vanes outlet, near the guide vane outlet located near said casing cover pressure port guide vane outlet A pump device characterized in that a separating plate is provided between the casing cover pressure port and the proximity guide vane outlet, and the separating plate is projected from the casing cover side. In claim 1,
A pump device characterized in that the proximity guide vane outlet is located above the casing cover pressure port. In claim 1 or 2,
A pump device having an opening between the casing cover pressure port and the proximity guide vane outlet.

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