KR101173735B1 - Self priming pump - Google Patents

Abstract

The present invention provides a self-priming pump having an impeller coupled to a shaft of the drive motor between a front casing having a suction hole and a discharge hole having a U-shaped transfer groove and a rear casing coupled to a drive motor. Inner ring and outer ring, and between the inner ring and the outer ring has a plurality of rotary blades extending radially about the inner ring, wherein one side of the rotary blade in the direction of rotation is formed an inclined surface inclined at a predetermined angle from the front to the rear And, the rear end portion is characterized in that the pressing plate is formed to partially block the open space generated between the adjacent rotary blades.

According to the present invention, it is possible to improve the pumping efficiency by reducing the frictional resistance caused by the flow of the fluid flow while increasing the discharge pressure, the discharge amount by generating a large pressing force to the fluid with a simple structure.

Pump, self-priming, impeller

Description

Self-priming pump {Self priming pump}

The present invention relates to a self-priming pump. More specifically, the pumping efficiency is expected to be improved by generating a large pressing force on the fluid even with the same driving force, thereby increasing the discharge pressure and the discharge amount and reducing the frictional resistance due to the fluid flow. It relates to a self-priming pump that can.

Generally, a pump is a device that transfers a fluid such as a liquid or gas to a specific place through a pipe by a pressure action, or pumps a fluid in a low pressure container into a high pressure container through the pipe. It is widely used in places where fluids are used, from farming, rural, mines, civil engineering works, factories, and homes. It is widely used not only for water but also for transportation of special fluids such as petroleum, various chemicals or pulp, viscous sludge, etc. It is used.

These pumps can be categorized into industrial pumps, chemical pumps, and domestic pumps for their purposes, and structurally, various types such as reciprocating pumps, rotary pumps, centrifugal pumps, axial pumps, friction pumps, submersible pumps, etc. It can be classified as a pump.

In addition, the pump may be classified into a non-suction pump that requires priming during the initial operation of the pump, and a self-priming pump that does not require the pump because self-priming is possible only with water in the pump casing. .

7 is a view illustrating an impeller of a self-priming pump according to the prior art, in which a suction port and a discharge port are formed in the front casing, and an impeller having radial rotary blades is embedded in the rear casing of the driving motor. It is configured to be coupled to the axial direction fixed.

In such a structure, when the impeller is rotated counterclockwise by the operation of the driving motor, the negative pressure is applied to the suction hole formed in the front casing according to the rotation of the impeller, and water is sucked through the suction port, and the sucked water rotates the impeller. After being pressurized and conveyed along the U-shaped conveying groove by the centrifugal force according to the discharge hole and the discharge port formed in the upper casing is pushed to the outside.

By the way, the conventional self-priming pump as described above has the advantage that the configuration is simple, the installation area is small and does not require a pick-up for the initial operation, but as shown in Figure 7 the pressing force on the structural side of the impeller It is weak and the frictional resistance of the fluid is large, the head is relatively low, there is a problem that does not maximize the pumping efficiency because the discharge pressure and the discharge flow rate is small.

In addition, a conventional self-priming pump for improving the pumping efficiency by employing a two-stage impeller instead of an impeller or improving the impeller in a complicated configuration is disclosed. However, such an improved technology is very complicated in structure and the installation area is increased. There is a problem in that the economic cost of the installation is increased.

Therefore, it is a situation that the development of a self-priming pump with improved pumping efficiency, which has a relatively simple configuration and inexpensive manufacturing cost but has a relatively large head, a high discharge pressure and a large discharge flow rate, is urgently required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and by improving the structure of the rotor blade portion of the impeller to increase the pressure applied to the fluid and reduce the frictional resistance of the fluid, relatively large head and increased discharge pressure and discharge It is to provide a self-priming pump to obtain a flow rate.

As a problem solving means of the present invention for achieving the above object,

In the self-priming pump comprising an impeller coupled to the shaft of the drive motor between the front casing having the suction hole and the discharge hole and the U-shaped transfer groove and the rear casing coupled to the drive motor, the impeller is an inner ring and an outer ring. And a plurality of rotary blades extending radially about the inner ring between the inner ring and the outer ring, wherein the rotating blades are formed to be inclined at an angle in a rotational direction, and a rear end thereof is disposed between adjacent rotating blades. A self-priming pump is disclosed in which a pressure plate is formed which partially blocks the created open space.

Here, the pressure plate may be formed to block half of the open space.

In addition, a curved surface portion rounded toward the rotation direction may be formed at the longitudinal end of the rotary blade connected to the outer ring.

In addition, the suction hole and the discharge hole may be formed in the front casing at a position eccentrically above the center of the drive shaft of the drive motor.

In addition, the front of the front casing is formed integrally with the suction pipe and the discharge pipe communicating with each of the suction hole and the discharge hole, the suction pipe may be formed to extend horizontally from the suction hole.

Self-priming pump according to the present invention,

Increasing the pressure applied to the fluid through the impeller with the inclined rotary blade and the pressure plate, reducing the frictional resistance of the fluid, and by applying a higher rotational force to the fluid through the upward eccentricity of the suction and discharge holes, the discharge pressure And increase the discharge amount has an effect that can improve the pumping efficiency.

In addition, since the structure is not complicated and easy to manufacture, there is an effect that the economic burden of manufacturing and installation is not large.

In addition to the effects specifically specified as mentioned above, it is added that unique effects that can be easily derived and expected from the characteristic configuration of the present invention can be included in the effects of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the self-priming pump according to the present invention.

In the following description of embodiments of the present invention, when it is determined that the technical features of the present invention may be unnecessarily obscured as a matter already known to those skilled in the art, such as known functions and known configurations. The detailed description thereof will be omitted.

1 is an exploded perspective view of a self-priming pump according to an embodiment of the present invention, Figure 2 is a perspective view of an impeller according to an embodiment of the present invention, Figure 3 is a front view of Figure 2, Figure 4 is a Side cross-sectional view showing only the rotor blade portion, Figure 5 is a rear view showing a front casing according to an embodiment of the present invention.

Referring to the drawings, the self-priming pump 1 according to the preferred embodiment of the present invention, the front casing 10, the rear casing 20, the impeller 30, the driving means of the impeller 30 Including the drive motor 40 is made.

As shown in the drawings, the driving pump 40 is positioned at the end, the rear casing 20 and the front casing 10 are sequentially coupled to the front of the driving motor 40, and the front casing ( Between the 10) and the rear casing 20, the impeller 30 is mounted on the drive shaft 41 of the drive motor 40 to be configured to be built.

Here, since the rear casing 20 and the driving motor 40 are all well-known components and do not have a special technical feature within the scope of the present invention, a detailed description thereof will be omitted. The characteristic components according to the present invention will be described in detail.

First, the front casing 10 is formed with a hollow suction hole 11 and a discharge hole 12 through which the suction and discharge of the fluid are formed, respectively, and the suction hole 11 and the discharge hole 12, respectively. At the lower side of the U-shaped feed groove 13 is formed.

The suction hole 11 and the discharge hole 12 are formed in the center of the shaft space groove 14 (here, the shaft space groove 14 is the tip end of the drive shaft 41 through the impeller 30 is located in the space The drive shaft 41 is formed so as not to interfere with the front casing 10).

In addition, the suction hole 11 and the discharge hole 12 are preferably formed at a position eccentrically above the shaft space groove 14 (that is, the center of the drive shaft 41) a predetermined distance (d).

When the suction hole 11 and the discharge hole 12 are formed to be eccentrically positioned upwards from the drive shaft 41 by a predetermined distance d, the fluid is in contrast to that formed in a horizontal position with the conventional drive shaft 41. The length of the pressurized conveyance along the shaped conveying groove 13 is increased by that, and the centrifugal force due to the rotation of the impeller 30 is further applied to the fluid, thereby increasing the discharge pressure.

The U-shaped conveying groove 13 may have a substantially semi-circular shape, and both upper end portions thereof may have various lengths from approximately upper portions of the suction holes 11 and discharge holes 12 to the center portions.

In response to the U-shaped conveying groove 13 formed in the front casing 10, the U-shaped conveying groove 21 may also be formed in the rear casing 20, and the conveying groove 21 formed in the rear casing 20. ) May be formed to have a lower depth of the groove than the transfer groove 13 formed in the front casing (10).

On the other hand, the inlet port 15 and the discharge port 16 is integrally formed on the front casing 10.

The suction port 15 and the discharge port 16 communicate with the suction hole 11 and the discharge hole 12, respectively, and are connected to external pipes (not shown), where the suction port 15 is in communication. It is preferably formed to extend in parallel with the suction hole (11).

Since the suction port of the conventional self-priming pump is formed to extend upward from the suction hole, the pipe line for suction is unnecessarily high, and accordingly, the head is increased to generate energy loss due to the suction of the fluid. As a result of reducing the bar, in the present invention, the suction port 15 is improved in a horizontal form with the suction hole 11, unlike the conventional method, so as to improve the suction power.

The discharge port 16 may be horizontally extended as shown in the drawing, and may be formed to extend upward as needed.

Next, the impeller 30 according to the present invention includes an inner ring 31 and an outer ring 32, and a plurality of rotary blades 33 extending radially between the inner ring 31 and the outer ring 32. Will be done.

A shaft hole 31a for penetrating the drive shaft 41 is formed in the center of the inner ring 31, and a key groove 31b for coupling with the drive shaft 41 is formed in the shaft hole 31a.

The plurality of the radial blades 33 formed in a radial form a straight line, it is characterized in that the inclined at a predetermined angle (θ) toward the rotation direction of the impeller (30).

As the rotary blade 33 is inclined in this way, the impeller 30 can apply a greater pressing force to the fluid when discharging the fluid into the discharge hole 12.

It is preferable that the inclination angle (theta) of this rotary blade 33 is about 10-20 degrees. However, the inclination angle is a design matter that can be appropriately selected according to the needs in consideration of the use, performance, etc. of the pump related to the discharge pressure, flow rate, etc. required by those skilled in the art. It will be appreciated that the bar is not limited to the angles presented above but may be selected at various arbitrary angles.

In addition, the rear end of the rotary blade 33 has a feature that the pressing plate 35 is formed.

The pressure plate 35 is formed between the inner ring 31 and the outer ring 32 so as to intercept a portion of the open space 36 generated between one rotary blade and the adjacent rotary blade, preferably the opening It may be formed to block half of the space 36.

Due to the formation of the pressure plate 35, the open space 36 generated between each of the plurality of rotary blades 33 is a half-closed and half-opened semi-closed structure. It is also possible to increase the pressing force of the fluid upon discharging.

That is, the fluid pressurized along the U-shaped conveying groove 21 of the rear casing 20 is discharged to the front of the impeller 30 through the open space 36 narrowly opened by the pressure plate 35 at the time of discharge. Since the pressure of the fluid pressurized along the U-shaped conveying groove 13 of the front casing 10 is further increased, and part of the open space 36 is closed by the pressure plate 35, the fluid is discharged at the time of discharge. The pressure plate 35 presses the fluid only toward the discharge hole 12 of the front casing 10 while preventing the loss and loss to the rear side of the impeller 30 (ie, the rear casing 20 side). It acts to further increase the pressure of the discharged fluid.

The rotary blade 33 extends from the inner ring 31 to the outer ring 32 as a whole in a straight line shape, and a curved portion having a streamlined round in the rotational direction at the end portion thereof in the longitudinal direction connected to the outer ring 32. It is preferable that 37 is formed.

As the curved portion 37 is formed at the end of the rotary blade 33, the frictional resistance between the rotary blade 33 and the fluid can be reduced during the rotation of the impeller 30, and thus the fluid has a greater rotational force. It can also act as an element to increase the discharge pressure.

In the impeller 30 having the above-described configuration, the thickness of the impeller, the number of the rotary blades 33, and the like may be variously selected, and this is the discharge pressure required by those skilled in the art. It is a design matter that can be appropriately selected according to the needs in consideration of the use and performance of the pump in relation to the flow rate and the flow rate.

The configuration of the self-priming pump 1 according to the preferred embodiment of the present invention has been described above. Hereinafter, the operation thereof will be briefly described.

6 is an operation example illustrating an operation state of the self-priming pump 1 according to the present invention. First, when the driving motor 40 is operated by applying power to the driving motor 40, the driving shaft 41 is mounted on the driving shaft 41. The impeller 30 is rotated in the counterclockwise direction (as seen from the front. Fig. 6 is shown in the clockwise direction because it is a rear view.), And a negative pressure is applied to the suction hole 11 to inhale the fluid. The fluid is pressurized along the U-shaped conveying grooves 13 and 21 while receiving the rotational force of the impeller 30.

The fluid pressurized along the U-shaped conveying grooves 13 and 21 is discharged to the outside through the discharge hole 12. In the present invention, the suction hole 11 and the discharge hole ( Since 12) is upwardly eccentric with respect to the drive shaft 41, the distance at which the fluid is transported along the U-shaped conveying grooves 13 and 21 is increased to receive a larger rotational force of the impeller 30, and also the impeller 30 Since the forward pressing force is further increased due to the improved structure of the fluid, the fluid is discharged at a higher discharge pressure.

In order to compare the self-priming pump 1 according to the present invention with the conventional self-priming pump, the size of the suction pipe and the discharge pipe is equal to 1-1 / 2 inch (38 mm) and the driving motor 40 is the same. To perform a rotation experiment at 1800 RPM to perform the same experiment in the same driving force.

As a result of the comparative experiments, in the case of the conventional self-priming pump, the maximum pumping capacity (Maximum Capacity) is about 6 m 3 / h and the maximum head (Maximum Head) is about 15 m, the self-priming pump according to the present invention is the maximum pumping The flow rate was approximately 8 m 3 / h and the maximum head reached 20 m.

Therefore, it can be seen that the pumping efficiency of the self-priming pump according to the present invention is improved by about 30 to 35% compared with the conventional self-priming pump.

As described above with reference to the self-priming pump according to the present invention, the technical scope of the present invention is not limited to the contents described in the above-described embodiments and drawings, it is modified or modified by those skilled in the art Modified equivalent configuration will be said to be within the scope of the technical idea of the present invention.

1 is an exploded perspective view of a self-priming pump according to an embodiment of the present invention;

2 is a perspective view of an impeller according to an embodiment of the present invention,

3 is a front view of FIG. 2;

Figure 4 is a side cross-sectional view showing only the rotor blade portion in FIG.

5 is a rear view showing a front casing according to an embodiment of the present invention;

Figure 6 is an operation example illustrating an operating state of the self-priming pump according to the present invention,

7 is a front view showing an impeller of a conventional self-priming pump.

＊ Explanation of symbols on major part of drawing ＊

10: front casing 11: suction hole

12: discharge hole 13: transfer groove

14: shaft space groove 15: inlet

16: outlet 20: rear casing

30: impeller 31: inner ring

32: outer ring 33: rotary blade

35: pressure plate 36: open space 37: curved portion 40: drive motor 41: drive shaft

Claims (5)

The drive motor 40 between the front casing 10 having the suction hole 11 and the discharge hole 12 and the U-shaped transfer groove 13 is formed and the rear casing 20 coupled to the drive motor 40. In the self-priming pump is built in the impeller 30 coupled to the drive shaft 41 of, The impeller 30 has a plurality of rotary blades 33 extending radially about the inner ring 31 between the inner ring 31 and the outer ring 32 and between the inner ring 31 and the outer ring 32. But  The rotary blade 33 is formed to be inclined at a predetermined angle toward the rotation direction of the impeller 30 from the front end portion, the rear end of the open space 36 formed between the adjacent rotary blades A part of the diaphragm is formed with a pressing plate 35, and the curved surface portion 37 rounded toward the rotation direction of the impeller 30 is formed at the longitudinal end of the rotary blade 33 connected to the outer ring 32. Self-priming pump. The method of claim 1, The pressure plate 35 is a self-priming pump, characterized in that formed to block half of the open space (36). delete The method of claim 1, The suction hole 11 and the discharge hole 12 are formed in the front casing 10 at a position eccentrically above the center of the drive shaft 41 of the drive motor 40. . 5. The method of claim 4, In the front of the front casing 10, the suction port 15 and the discharge port 16 which are respectively communicated with the suction hole 11 and the discharge hole 12 are integrally formed, the suction hole 15 is the suction hole ( A self-priming pump, characterized in that it is formed to extend horizontally from 11).

Images