KR20100040356A - The centrifugal pump where the discharge lift is augmented - Google Patents

Abstract

PURPOSE: A centrifugal pump which increases the head of discharge is provided to reduce the loss of a pumping pressure by preventing the fluid of a pumping chamber from bacwardly flowing. CONSTITUTION: A centrifugal pump includes a motor(20), an impeller casing(30) and an impeller(40). The motor is operated by electrical energy. The motor is embedded in a motor casing(10). The impeller casing is combined to the motor casing in order to form a pumping chamber(31). An inlet(32) is formed on the front side of the impeller casing. The outlet is formed on one side of the impeller casing.

Description

Centrifugal pump where the discharge lift is augmented

The present invention relates to a centrifugal pump in which a fluid is pumped by an impeller rotation, and more particularly, to a centrifugal pump improved so that the discharge pressure is increased by minimizing the internal pressure loss in the pumping chamber so that the discharge pressure can be increased. It is about.

Document 1 KR 20-0381343 Y1 2005.04.21

In general, the centrifugal pump is a pump that is a function of discharging the fluid by rotating the impeller in the pumping chamber by the motor power, which is commonly used as a circulation pump and is also referred to as a pump in the present invention.

Therefore, the pump performance is determined by the performance of the motor and the rotational speed of the impeller, the higher the motor power and the higher the rotational speed of the impeller, the higher the fluid discharge pressure and discharge amount, and the higher the pump The higher the price of the pump, the lower the price of the lower pump.

As the pump is capable of providing high performance pumps at a lower price as the higher lift output is possible under the conditions constituting the low lift pump, the pump with improved product performance can be purchased and used at a lower cost. Since the competitiveness is improved, many studies have been initiated.

  In the prior art, a circulation pump of Korean Utility Model Registration No. 0381343, which was pre-registered by the inventor, has been disclosed, and the prior art allows the pumping capability of the fluid to be improved by allowing the airtight of the pumping chamber in which the impeller is rotated to be maintained. will be.

  However, the pump of the prior art was found to be not so high in the height of the head when compared to the pump that does not improve the pumping chamber airtight, which leads to the intensive study and experiment of the cause and solution It became.

Therefore, in the cause, since the suction port provided in the casing forming the pumping chamber of the pump and the pumping chamber are in direct communication, the fluid in the pumping chamber which is swirled by the rotational force of the impeller rotating at high speed is directed toward the suction port instead of the discharge port. It was analyzed that this is because a back ejection phenomenon that is about to be ejected occurs.

Specifically, the fluid has a pumping pressure because the rotation speed of the impeller is fast in the pumping chamber. The pumping pressure is higher than the suction force of the fluid flowing into the suction port.

Therefore, the pumping pressure causes the fluid in the pumping chamber to be discharged back toward the suction port. Of course, the fluid discharged back to the suction port is sucked back into the suction port, but the suction force of the fluid is weakened, causing a decrease in suction amount.

In addition, since the pumping pressure is lowered due to the back discharge phenomenon of the fluid, the output power of the fluid discharged to the discharge port is lowered, thereby causing a problem that the discharge head is lowered.

Therefore, in order to increase the discharge head, it is necessary to improve the structure so that the pumping pressure is not lost. However, in order to improve the structure in order to reduce the pumping pressure loss, the structure is complicated and a lot of parts are required to increase the cost or increase the volume, the discharge head may be high, but the price is expensive and there is no economic.

Therefore, it has led to the study to make it possible to increase the discharge head while having a simple structure to reduce the cost.

It is an object of the present invention to provide a centrifugal pump that has a simple structure to reduce cost and increases a discharge head.

The present invention for achieving the above object is a motor operated by the electric energy and embedded in the motor casing; An impeller casing fixed to be coupled to the motor casing to form a pumping chamber, having an inlet at a front side, and an outlet at one side; An impeller fixed to a motor shaft of the motor and rotating in a pumping chamber and having a plurality of vanes; It characterized in that it comprises a reverse flow blocking means having a centrifugal force generating member which is provided between the inlet and the elongated pair of blocking members protruding inwardly to have a concentric circle, and the impeller front portion rotates in the pivoting groove. .

The pair of blocking members, the rotating groove portion and the centrifugal force generating member is characterized in that the circular shape.

The pair of blocking members are formed integrally with the impeller casing and the centrifugal force generating member is formed integrally with the impeller.

The blocking member may be configured to protrude integrally on the same center line as the suction port in order to have a fluid suction guide function.

The motor casing and the impeller casing are characterized in that the bolt portion and the nut hole are formed to be coupled to each other.

In the present invention, since the fluid in the pumping chamber does not flow back to the suction port, there is no pumping pressure loss, and thus the discharge head is increased to increase as the discharge pressure is increased, thereby improving product performance and product reliability.

In addition, since the countercurrent blocking means has a simple structure, it has the effect of being able to be distributed inexpensively because the cost of the product is not large and the cost is not great, and thus the internal and external competitiveness is improved.

When described in more detail on the basis of the accompanying drawings the preferred embodiment of the present invention.

Figure 1 is an overall longitudinal cross-sectional view of the centrifugal pump according to the present invention, Figure 2 is an exploded perspective view showing the countercurrent blocking means.

1 and 2, the present invention includes a motor casing 10, and a motor 20 driven by electric energy is installed in the motor casing 10.

In addition, the impeller casing 30 is fixedly coupled to the front of the motor casing 10 to form a pumping chamber 31, and the inlet 32 is provided at the front portion thereof, and the outlet 33 is provided at one side thereof.

The motor casing 10 and the impeller casing 30 are provided with a bolt portion 11 and a nut hole 34 to be coupled to each other so that the motor casing 10 and the impeller casing 30 can be more easily fixed. Reference numerals 12 and 35 denote packings for leakage prevention.

Accordingly, the impeller 40 having the plurality of vanes 41 is fixed to the motor shaft 21 of the motor 20 by the fixing screw 22 so as to be rotatable in the pumping chamber 31.

Therefore, when the motor 20 is operated, the impeller 40 is rotated so that the fluid is sucked through the suction port 32 and discharged to the discharge port 33, and the reverse flow blocking means 50 is further provided therein.

The reverse flow blocking means 50 has a pair of long blocking members 51 and 52 protruding inwardly so as to have a concentric circle with the suction port 32 so as to rotate between the pair of blocking members 51 and 52. It is configured to have).

In addition, the impeller 40 is configured to protrude a centrifugal force generating member 54 which is rotated in the rotation groove 53 in the front portion.

The pair of blocking members 51 and 52 and the rotation groove 53 of the countercurrent blocking means 50 are formed in a circular shape and integrally formed with the impeller casing 30 formed of a plastic material.

In addition, the centrifugal force generating member 54 is also formed in a circular shape and is integrally formed with the impeller 40 formed of a plastic material.

And the blocking member 51 on the inner side of the pair of blocking members (51, 52) is configured to protrude integrally on the same center line as the inlet (32) to have a fluid suction guide function.

Accordingly, in the present invention, when the impeller 40 is rotated, the centrifugal force generating member 54 is rotated in the rotating groove 53 so that the fluid in the pumping chamber 31 is pushed outward to the rotating groove 53. It will stop the fluid from pushing in and out.

In addition, since there are blocking members 51 and 52 on both sides of the centrifugal force generating member 54, the fluid in the pumping chamber 31 serves to block backflow of the fluid to the suction port 32.

In the present invention, the longer the length of the pair of blocking members (51, 52), the rotating groove portion 53 and the centrifugal force generating member (54) can better block the flow back to the suction port (32).

The centrifugal force generating member 54 inserted into the rotating groove 53 does not come into contact with the blocking members 51 and 52 but rotates while maintaining a clearance (tolerance) of about 0.5-1 mm so that the rotating groove 53 is rotated. In order for the fluid to flow back toward the suction port 32, the centrifugal force generating member 54 is inserted to pass through a gap of about 0.5-1 mm, and the gap forms a U-shaped gap so that the fluid is further rotated. It has a function to prevent backflow toward the suction port 32 through the gap in the).

   Therefore, since the fluid in the pumping chamber 31 does not flow back to the suction port 32 by the backflow blocking means 50 having the above function, there is no pumping pressure loss.

Therefore, as the discharge pressure in the pumping chamber 31 is increased, the discharge head is increased to be higher.

Referring to (a) of FIG. 4, which shows a conventional pump for better understanding of the present invention, since the fluid in the pumping chamber 31 flows back toward the suction port 32, the pump is discharged to the discharge port 33 due to the pumping pressure loss. As the discharge pressure of the fluid is lowered, the discharge head h 'is lowered. However, in the pump of the present invention, as shown in FIG. 4B, the fluid of the pumping chamber 31 does not flow back to the suction port 32. There is no loss of pumping pressure.

Therefore, since the discharge pressure of the fluid discharged to the discharge port 33 is increased, the discharge head h is increased, so that the pump performance is improved and product reliability is improved.

 In addition, since the countercurrent blocking means 50 has a simple structure, it can be inexpensively distributed because the cost increase is not great while having product performance and reliability.

Although the present invention has been described as an exemplary embodiment, the present invention is not limited thereto, and the present invention can be variously implemented within the technical spirit and claims of the present invention by those skilled in the art to which the present invention pertains. It is self-evident that it must be widely protected unless it deviates.

1 is a longitudinal cross-sectional view of the centrifugal pump according to the present invention;

2 is a partially separated perspective view showing the reverse flow blocking means according to the present invention;

3 is a cross-sectional view of the line Y-Y 'of FIG.

Figure 4 (a), (b) is a schematic action diagram of the existing centrifugal pump and the present invention centrifugal pump comparing and explaining the operation of the present invention,

Explanation of symbols on the main parts of the drawings

10: motor casing 20: motor

30 impeller casing 31 pumping chamber

32: suction port 33: discharge port

40 impeller 50 countercurrent blocking means

1,52: blocking member 53: rotating groove

54: centrifugal force generating unit

Claims (5)

A motor 20 operated by electric energy and embedded in the motor casing 10; An impeller casing (30) fixed to be coupled to the motor casing (10) to form a pumping chamber (31), having a suction port (32) at the front side, and a discharge port (33) at one side; An impeller (40) fixed to the motor shaft (21) of the motor (20) and rotating in the pumping chamber (31) and having a plurality of vanes (41); The rotating groove 53 is provided between the pair of elongated blocking members 51 and 52 protruding inwardly so as to have a concentric circle with the suction port 32 and rotated in the rotating groove 53 at the front of the impeller 40. A centrifugal pump having an increased discharge head, characterized in that it comprises a countercurrent blocking means (50) having a centrifugal force generating member (54). The centrifugal pump according to claim 1, wherein the pair of blocking members (51, 52), the rotating groove portion (53), and the centrifugal force generating member (54) are circular. The discharge head of claim 1, wherein the pair of blocking members (51, 52) are integrally formed with the impeller casing (30) and the centrifugal force generating member (54) is integrally formed with the impeller (40). Increased centrifugal pump. The centrifugal pump according to claim 1, wherein the blocking member (51) is configured to protrude integrally on the same center line as the suction port (32) in order to have a fluid suction guide function. The centrifugal pump according to claim 1, wherein the motor casing (10) and the impeller casing (30) form a bolt part (11) and a nut hole (34) to be coupled to each other.

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