JPH0450474Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a motor pump for draining residual water at a low water level, and in particular, the motor pump body is surrounded by a pump outer body, and the pump discharge liquid is transferred to the motor pump. The present invention relates to an internal motor pump in which a motor is cooled by discharging water to the outside through a space between a main body and a pump outer cavity.

[Conventional technology]

Conventionally, a submersible motor pump is installed immersed in a liquid tank, the discharge port of the submersible motor pump is opened to the liquid tank, and the pumped liquid is guided from the outside of the liquid tank to the pump suction port through a suction conduit. A so-called external motor pump, which discharges pump discharge liquid to the outside from a discharge port provided at the top of the liquid tank, is conventionally known. In addition, the suction conduit is made flexible so that its open end can be inserted into any liquid supply source as a liquid suction port, and when the liquid supply source has a shallow liquid depth, the liquid Some pumps are equipped with a self-priming function in order to prevent air from being sucked in through the suction opening end as the water gets sucked up and nearing a dry state, causing aerodynamics in the pump chamber and making it impossible to pump liquid. It belongs to the conventionally known.

The above-mentioned external motor pump is mobile and has a self-priming function, so if a puddle in a civil engineering work site is selected as the liquid source, most of the remaining water will be removed from the liquid suction opening end. It is possible to inhale and drain water without any problem.

[Problem that the invention attempts to solve]

The conventionally known motor pump described above forms an external motor pump in which the submersible motor pump is installed in a liquid tank, and as can be seen from the fact that wheels are attached to the bottom of the liquid tank. However, since the entire device is large and heavy, and the liquid tank is also large, there was a problem in that a large amount of self-priming water was required when starting the pump.

On the other hand, there is an internal type in which the motor pump body is surrounded by a pump outer body, and the pump discharge liquid is discharged to the outside through a space formed between the motor pump body and the pump outer body, and the motor is cooled. Motor pumps have also been used for a long time, but
In this case, the space between the pump outer shell and the motor pump body is merely used as a pump discharge passage that also serves as a motor cooling liquid passage.

The technical challenge of this invention is to provide a portable motor pump that can drain residual water even when the water level is small, is small, lightweight, and easy to carry, and has a high self-priming effect during self-priming. There is.

[Means for solving problems]

In order to solve the problems and technical problems of the conventionally known external motor pumps mentioned above, the present invention has the following features:
A liquid chamber in which a pump section driven by a motor is installed is constituted by a pump outer body in an internal motor pump, and the pump outer body is covered with a head cover section of the motor, and the head cover section A suction port communicating with the suction port of the pump part and a discharge port for discharging the pump discharge liquid to the outside are provided respectively, and a self-priming circulation system is provided in the empty space surrounded by the pump outer body and the motor pump body. A liquid suction port is opened, and the suction port is located near the opposite side of the direction of the flow discharged from the pump section discharge port in the circumferential direction.

[Effect]

Since the present invention is constructed as described above, when the pump is started, when the required self-priming water is supplied into the pump outer body, the priming water is surrounded by the motor pump body and the pump outer body. stored in vacant rooms. Next, when the pump is started, the breathing water is sucked into the pump section, that is, into the pump chamber, from the self-priming circulating fluid suction port opened in the empty chamber, and during this suction process, the water on the suction side drawn into the pump suction port is It is pressurized together with air by an impeller, becomes a gas-liquid mixture, and is discharged from the discharge port of the pump chamber into the pump outer body in the circumferential direction. This discharged gas-liquid mixture is separated inside the pump outer body, the air is exhausted to the outside from the discharge port provided in the motor head cover, and only the liquid is pumped again from the self-priming circulating fluid suction port. By the circulation flow that is drawn into the chamber and thus formed,
A self-priming effect or vacuum suction effect occurs.

At this time, since the above-mentioned self-priming circulating fluid suction port is installed near the opposite side of the direction of the flow discharged in the circumferential direction from the pump part discharge port, the flow is discharged in the circumferential direction from the pump part discharge port. The gas-liquid mixture is not immediately sucked in from the self-priming circulating fluid suction port, and the gas-liquid mixture is detoured from the pump part discharge port along the inner wall of the pump outer body, and then reversed. Gas and liquid are separated during the long process of reaching the self-priming circulating fluid suction port installed on the side. Therefore, the self-priming effect becomes high.

Due to the above self-priming action, negative pressure is generated at the suction port of the motor head cover connected to the pump suction, and air is drawn out from the suction conduit connected to the suction port. As the air on the suction side is removed in this way, liquid is sucked in from the suction port at the tip of the suction conduit, and this sucked liquid joins the circulation flow described above in the pump chamber and is pressurized by the impeller. , is discharged into the pump outer shell. The discharged liquid is discharged from the discharge port of the motor head cover portion to a predetermined position while filling the pump outer body with water, and the self-priming action is completed.

As described above, after the self-priming action is completed and normal pump operation is started, the pump functions as a normal motor pump, and the pumped liquid sucked in from the suction port of the motor head cover is pressurized. Similarly, it is discharged from the discharge port to a predetermined location. Furthermore, during operation, when the water level on the suction side drops and air is sucked in from the suction port, the above-mentioned self-priming action is performed as appropriate, so the pump action continues without being interrupted by the air pump. , almost all water can be sucked out without leaving any residual water.

In addition, the pump outer shell corresponds to the pump outer shell in conventional internal pumps, and is located below the motor head cover and has a small volume. Both self-priming action and motor cooling action are effectively performed internally.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a vertical sectional view taken along the line of FIG. 2 of a motor pump showing an embodiment of the present invention;
The figure is a plan view.

In the figure, a motor pump main body 2 is installed eccentrically inside a cylindrical pump outer shell 1 as shown in FIG. Motor head cover 3 with expanded
and the bottom is closed by a bottom plate 4, into which the motor pump body 2 is inserted and tightened with through bolts 5. As a result, the eccentric annular cavity 6 surrounded by the pump outer shell 1 and the motor pump main body 2 is kept in a sealed state.

The wide part of the peripheral part 3a of the motor head cover 3, that is, the part where the motor pump main body 2 is farthest from the pump outer body 1 (the left part in FIG. 2) has a suction port 7 and a discharge port 8. are provided close to each other, and the suction port 7 has a suction check valve 7.
A is built-in. When in use, a flexible suction conduit and a discharge pipe (not shown) are connected to the suction port 7 and the discharge port 8, respectively.

On the other hand, the pump section disposed at the lower end of the motor pump main body 2 moves the impeller 22 back into the pump casing 21 to near the rear wall (upper wall in the figure) 21a of the casing, and the impeller 22 is placed in front of the impeller 22. A so-called vortex pump is formed by forming a wide gap (side clearance) D4 and carrying out foreign substances such as sand along with the vortex generated in the gap during pump operation, thereby reducing wear on the impeller. An airlock prevention nut 23 is attached to the inlet boss portion of the impeller 22.

The pump casing 21 has a pump chamber suction port 2.
4 is formed with an annular gap (minimum dimension) D ₃ maintained, and the pump chamber suction port 24 is connected to the suction passage 24.
a, it is connected to a pump casing suction port 25 corresponding to the pump section suction port. The pump casing suction port 25 is connected to the suction port 7 via a flexible hose 26 and a connecting pipe 26a.

On the other hand, the pump chamber discharge port 27, which corresponds to the pump part discharge port, opens in the circumferential direction (tangential direction) into the eccentric annular inner cavity 6, that is, the pump outer body inner discharge chamber. The pump casing suction port 25 is installed at a position near the pump chamber discharge port 27 on the opposite side to the direction of the flow discharged from the pump chamber discharge port 27 in the circumferential direction.

Near the pump casing suction port 25,
A circulating fluid suction pipe 9 having an outlet nozzle 9a with a diameter D ₂ opened toward the suction passage 24a projects upward, and has a circulating fluid suction port 9b with a diameter D ₁ formed at the upper end. ing. The suction port 9b opens at a position higher than the bottom surface of the main plate of the impeller 22. The nozzle diameter D ₂ is smaller than the diameter D ₁ of the circulating fluid suction port 9b, and the minimum diameter of the pump chamber suction port 24 is
D ₃ is smaller than D ₂ , and the side clearance D ₄ of the impeller 22 is larger than D ₃ and smaller than the nozzle diameter D ₂ . These series of dimensions are
This is to prevent foreign matter from clogging the nozzle, etc., by repelling it at the pump chamber suction port when foreign matter enters the pump chamber. In addition, in the figure, 31 is an elastic leg part, 32
3 is a cable outlet, and 33 is a water (liquid) outlet.

Next, the effect will be explained. When starting the pump,
When the required self-priming priming water is supplied into the pump outer body 1, the priming water is distributed between the motor pump body 2 and the pump outer body 1.
It is stored in an empty chamber (discharge chamber) 6 surrounded by. Next, when the pump is started, breathing water is sucked into the pump casing 21 from the self-priming circulating fluid suction port 9b opened in the empty chamber 6. In this process, the liquid sucked from the self-priming circulating fluid suction port 9b is ejected from the outlet nozzle 9a toward the suction passage 24a, creating a negative pressure in the outlet nozzle 9a section. Due to the generation of negative pressure, air flows through the suction port 7 of the motor head cover peripheral part 3a.
Air in a suction pipe (not shown) connected to the suction port 7 is sucked.

The air on the suction side sucked in as described above,
The liquid sucked from the self-priming circulating fluid suction port 9b,
The gas-liquid mixture is pressurized by the impeller 22 in the pump chamber, and is discharged from the pump chamber discharge port 27 into the empty chamber (discharge chamber) 6. This discharged gas-liquid mixture is separated in the cavity 6, the air is expelled to the outside from the discharge port 8, and only the liquid is sucked in again from the self-priming circulating water suction port 9b. A circulating flow is formed and self-priming occurs.

At this time, since the self-priming circulating fluid suction port 9b is installed near the opposite side of the direction of the discharge flow from the pump chamber discharge port 27 which is discharged in the circumferential direction, the pump chamber discharge port 27 The gas-liquid mixture discharged from the pump is not immediately sucked in from the self-priming circulating fluid suction port 9b, but is discharged in the circumferential direction and then detoured along the inner wall of the pump outer body 1, Since gas and liquid are separated while passing through the long path to the self-priming circulating fluid suction port 9b on the opposite side, the separation efficiency is improved, and the self-priming effect is therefore enhanced.

Due to the above-mentioned self-priming action, as the air on the suction side is gradually removed, the liquid is sucked in from the suction port at the tip of the suction conduit (not shown) via the suction port 7 of the head cover section, and merges with the above-mentioned circulation flow in the pump chamber.
It is pressurized by the impeller 22 and discharged into the empty chamber 6.
With the discharged liquid filling the empty chamber 6 with water, the self-priming action is completed as the liquid is discharged from the discharge port 8 of the motor head cover.

After the self-priming action is completed in this way and normal pump operation begins, the pump functions as a normal motor pump, and the liquid sucked in from the suction port 7 of the motor head cover is pressurized by the impeller 22. The liquid is then discharged from the discharge port 8 to a predetermined location. During this normal operation period, even if sand or the like is sucked in from the suction port at the tip of the suction conduit (not shown), the pump part is formed as a vortex pump, so it will ride on the vortex generated in the space in front of the impeller 22. Since the water is discharged from the pump chamber discharge port 27, wear on the impeller 22 can be reduced.

Furthermore, even if the sand discharged from the pump chamber discharge port 27 piles up in the empty chamber 6 in the pump outer body, pressure liquid is discharged from the pump chamber discharge port 27.
The discharge port 27 is not filled with sand, and since the circulating fluid suction port 9b opens at a higher position than the main plate of the impeller 22, no sand is sucked in from the circulating fluid suction port 9b.

In addition, since the motor pump main body 2 is installed eccentrically within the pump outer shell 1, the pump chamber discharge port 2
As the fluid discharged from 7 flows through the eccentric annular cavity 6 and reaches the discharge port 8 and a part of it reaches the circulating fluid suction port 9b, it becomes uneven and turbulent. There is less sedimentation.

Also, if foreign matter gets mixed in during operation, the nozzle may be clogged because the diameter D ₁ of the circulating fluid suction port 9b and the diameter D ₂ of the nozzle 9a are larger than the minimum dimension D ₃ of the pump chamber suction port 24. Hateful. During operation, when the water level on the suction side decreases and air is sucked from the suction port, the self-priming action described above is performed again, and the pump action is interrupted without being interrupted by the air pump. Therefore, almost all of the remaining water is also sucked up. During this time, the liquid stored in the cavity 6 in the pump outer body not only prims for self-priming, but also performs a motor cooling action.

According to this embodiment, the following effects are achieved.

() The peripheral wall of the liquid tank of a conventional motor pump of this kind is constructed with the pump outer body 1 of an internal type motor pump, making the entire motor pump an internal type, and the pump outer body 1 is combined with a motor head cover 3 and a bottom plate 4. By passing it through and tightening with the bolt 5, it is small and lightweight, easy to carry, disassemble and inspect, and requires less priming water for self-priming. Further, since the motor head cover 3 is open to the atmosphere, there is no need to make the motor cable outlet watertight as in the case of an external type, and the carrying handle can be attached directly to the motor head cover.

() By installing the circulating fluid suction port 9b for self-priming at a position near the opposite side of the flow direction discharged from the pump chamber discharge port 27 in the circumferential direction, air entrained during self-priming is removed. Since the path for the liquid mixture to reach the circulating fluid suction port 9b becomes longer,
The gas-liquid separation efficiency is improved, and therefore the self-priming effect can be enhanced.

In addition, a narrow gap (resistance part) between the motor pump main body 2 and the pump outer shell 1, which are installed eccentrically in the pump outer shell 1, is interposed in the middle of the above-mentioned path, so that the above-mentioned gas-liquid mixing is possible. The residence time in the body is longer and the gas-liquid separation effect is promoted.

() Since the self-priming circulating fluid suction port 9b is provided at a position higher than the bottom surface of the main plate of the pump impeller 22, there is no fear that the suction port 9b will be buried in earth and sand deposited inside the pump outer body during operation.

() By eccentrically installing the motor pump main body 2 in the pump outer shell 1, the pump chamber outlet 27 and the outlet 8 of the Herod cover part and a part of the pump outer shell reach the circulating fluid suction port 9b. Because the flow becomes uneven and turbulent, less sediment accumulates at the bottom.

Furthermore, the small pump outer shell 1 can be used spatially effectively to arrange the internal self-priming circulating fluid suction port 9b and the suction port 7 and discharge port 8 on the motor head cover in a rational manner. can.

In the embodiments described above, a structure has been described in which the opening of the pump chamber discharge port 27 disposed in the circumferential direction is directed in a direction perpendicular to the pump shaft, that is, toward the inner surface of the pump outer body. The opening of the discharge port may be provided by bending the distal end of the discharge port in the circumferential direction upward, or the discharge port opening may be provided so as to branch in the vertical direction.

In addition, although we have described a structure in which the pump part is a vortex pump, it is of course possible to use a vortex pump equipped with wear-resistant means, and the bottom of the pump outer body can be constructed with a bottom plate. Although the structure in which the pump body and the bottom plate are tightened with through bolts has been described, it is also possible to form the pump outer body and the bottom plate integrally.

Further, the motor pump main body can also be installed concentrically within the pump outer shell.

[Effect of idea]

As explained above, according to the present invention, the liquid chamber in which the motor-driven pump section is installed is constituted by the pump outer body of an internal motor pump, and the pump outer body is covered with the motor head cover section. The head cover section is provided with a suction port that communicates with the pump section suction port and a discharge port that discharges the pump discharge liquid to the outside, and a self-contained pump is provided in the empty space surrounded by the pump outer body and the motor pump body. By opening the suction circulating fluid suction port, the fluid can be stored up to the upper part of the pump's outer body, and the overhang to the outside diameter side can be reduced, making the entire motor pump compact. It can be made lightweight. Therefore, it is easy to carry, and the interior can be easily inspected by removing the motor head cover.

In addition, since the liquid storage part is smaller than that of conventional external pumps, less priming water is required for self-priming, and even a small amount of residual water can be easily drained with this small amount of priming water.

In addition, by installing the circulating fluid suction port for self-priming in a position near the opposite side of the direction of the flow discharged in the circumferential direction from the discharge port of the pump part, gas-liquid mixing that involves air during self-priming is possible. Since the path from the body to the circulating fluid suction port becomes longer, the gas-liquid separation efficiency is improved, and therefore the self-priming effect can be enhanced.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view taken along the line in FIG. 2 of a motor pump showing an embodiment of the present invention, and FIG. 2 is a plan view thereof. 1...Pump outer body, 2...Motor pump body,
3...Motor head cover, 4...Bottom plate, 5...
Through bolt, 6...Empty chamber (discharge chamber), 7...Suction port, 8...Discharge port, 9...Circulating fluid suction pipe, 9a...
... Nozzle, 9b ... Circulating fluid suction port, 21 ... Pump casing, 22 ... Impeller, 24 ... Pump chamber suction port, 25 ... Pump part (casing) suction port, 27 ... Pump chamber discharge port.

Claims (1)

[Claims for Utility Model Registration] 1. A pump section driven by a motor is installed in a liquid chamber, a discharge port of the pump section is opened into the liquid chamber, and the pumped liquid is introduced from the outside of the liquid chamber to the suction port of the pump section. In the motor pump, the liquid chamber is configured by a pump outer body, and the upper opening of the pump outer body is covered by a head cover portion of the motor, The head cover section is provided with a suction port communicating with the pump section suction port and a discharge port for discharging the pump discharge liquid to the outside, and in a vacant space surrounded by the pump outer body and the motor pump body, A portable motor pump, characterized in that a circulating fluid suction port for self-priming is opened, and the suction port is installed near the opposite side of the direction of the flow discharged in the circumferential direction from the discharge port of the pump section. . 2. The portable motor pump according to claim 1, wherein the pump outlet is provided in the circumferential direction. 3. The portable motor pump according to claim 1, wherein the self-priming circulating fluid suction port is provided at a higher position than the bottom surface of the impeller main plate of the pump section. 4 The motor pump body is installed eccentrically within the pump outer shell, and there is a narrow gap between the pump outer shell and the motor pump body in the middle of the flow from the pump outlet to the self-priming circulating fluid suction port. A portable motor pump according to claim 1, wherein a portion is interposed.