KR19980017629A - Wear ring structure of centrifugal pump - Google Patents

Abstract

In the wear ring structure of a centrifugal pump including at least a casing incorporating an impeller, between the impeller, the casing and the casing cover, an elastic rubber having elastic force is provided, and an airtight member having first, second and third lips is provided. Since it is possible to minimize the leakage loss by forming a multi-stage sealing structure, there is an effect of improving the efficiency of the pump and the reliability of the pump.

Description

Wear ring structure of centrifugal pump

The present invention relates to a wear ring structure of a centrifugal pump, in particular, a centrifugal pump capable of minimizing water leakage by installing a seal member having a predetermined configuration between an impeller inlet end and a casing inlet of a centrifugal pump in a multi-step reduction method of pressure water. Of the wear ring structure.

In general, the centrifugal pump has a structure as shown in FIG. 1 is a half sectional view showing the structure of a conventional centrifugal pump. In this figure, reference numeral 10 denotes an impeller and 20 denotes a casing surrounding the impeller 10. One side of the casing 20 is further provided with a casing cover 30 to maintain the airtightness of the space portion in which the impeller 10 is installed.

In addition, the casing 20 is provided with a suction port 21 and a discharge port 22, the one side is blocked by the casing cover 30 to maintain the airtight.

The impeller 10 has a large diameter inlet end 12 and a small diameter outlet end 14, and is closely assembled to the inner side of the casing 20 and the casing cover 30. This assembly is made with very small clearances 44 in the members called wear rings 40 and 42, respectively. The wear rings 40 and 42 generally use stainless steel or bronze for rust prevention and durability. In FIG. 1, reference numeral 60 denotes a rotation shaft and 62 denotes an outer cover.

The wear ring structure of a conventional centrifugal pump configured as described above, when the power is applied to the motor, the impeller 10 rotates and the internal fluid is sucked into the casing 20 by the centrifugal force of the blade of the impeller 10, At this time, the pressure of the inlet end 12 of the impeller 10 and the pressure of the outlet end 14, which is the wing end, show a difference. That is, the pressure at the outlet end 14 becomes a vacuum state and sucks the fluid of the ground water through the inlet 21 of the casing 20. At this time, the fluid inside the casing 20 inevitably leaks through the micro clearance 44 between the wear rings 40 and 42 and the impeller 10 due to the pressure difference.

By the way, the impeller 10 and the wear rings 40 and 42 inevitably have to form a clearance, and the small leak phenomenon has become unavoidable. In addition, the gap 44 must be managed by giving a precise tolerance to these fitting parts, and the precision of the impeller 10 and the wear ring 40, 42 is often constrained from each other and becomes inoperable. There was. In addition, during long periods of operation stop, since the rust and rust sticks to the surface of the special materials of the wear rings 40 and 42 described above, when the power switch is operated without knowing such a state, the motor is restrained and burned out. In such a case, there is a problem in the repair cost of replacing and repairing the motor.

In other respects, it may be considered to increase the clearance 44 between the impeller 10 and the wear rings 40, 42. This can solve problems such as motor burnout, but it causes the performance of the centrifugal pump to deteriorate, so that the casing 20 and the wear rings 40 and 42 are formed of a metal indentation structure. 20) There is a big problem in the repair that must be replaced.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a wear structure of a centrifugal pump capable of minimizing leakage by installing an airtight member having a predetermined configuration between an impeller inlet end of the centrifugal pump and a casing inlet. Is in.

Figure 1 is a half cross-sectional view showing a wear ring structure of a conventional centrifugal pump

Figure 2 is a sectional view of the main part showing the wear ring structure of the centrifugal pump of the present invention

* Description of the symbols for the main parts of the drawings *

10 impeller 12 inlet end

14: outlet end 16, 17: flat surface portion

20 Casing 21 Inlet

22 discharge port 26,36 seating part

30: casing cover 40, 42: wear ring

44: clearance 60: axis of rotation

62: outer cover 80: airtight material

82: reinforcement 83: first grain

84: second lip 85: third lip

In the wear ring structure of the centrifugal pump of the present invention for achieving the above object, the wear ring structure of a centrifugal pump including a casing having at least an impeller is provided, and an elastic airtight member is provided between the impeller, the casing and the casing cover. .

In addition to this configuration, the airtight material is elastic rubber with elasticity, and is preferably provided between each seating portion formed on the casing and the casing cover and the flat surface portion formed on the left and right ends of the impeller. It is preferable to have a reinforcement having a 'b' cross section for strength reinforcement, and the first and second lip perpendicular to the flat surface portion of the impeller on the side in contact with the impeller is vertically formed It is good to consist of three.

Therefore, according to the wear ring structure of the centrifugal pump of the present invention, since an airtight member made of an elastic rubber material is provided between the impeller inlet end and the casing inlet of the centrifugal pump, the manufacturing cost can be reduced, and moreover, by integrating a plurality of ribs Multi-stage sealing structure minimizes leakage loss, improving pump efficiency. Since it is not a metal wear ring structure, the motor operates smoothly without restraint caused by rust, etc., even after starting operation for a long time. It is effective to increase the reliability.

EXAMPLE

Hereinafter, the wear ring structure of the centrifugal pump of the present invention will be described in detail with reference to the accompanying drawings. For the same parts as the conventional description, the same reference numerals are used to avoid the complicated description.

2 is a sectional view showing the main parts of the wear ring structure of the centrifugal pump according to the present invention. In this figure, reference numeral 80 is an airtight member installed between the impeller 10, the casing 20, and the casing cover 30. It is preferable that the hermetic material 80 is usually composed of a flexible material. In this embodiment, elastic rubber having elastic force is used. The casing 20 and the casing cover 30 are respectively seated on the seating portion 26, 36 is formed.

In addition, this hermetic material 80 has a reinforcement 82 which has a predetermined shape for the strength, and in this embodiment, has a 'b' shaped cross section therein. In addition, the airtight member 80 is provided with a predetermined number of lips on the side in contact with the impeller 10. Of course, the number is not limited thereto. In the present embodiment, the first lip 83, the second lip 84, and the third lip 85 are configured.

Left and right ends of the impeller 10 are flat surface portions 16 and 17 for assembling the first lip 83, the second lip 84, and the third lip 85 of the airtight member 80. Forming.

Since the wear ring structure of the centrifugal pump of the present invention having such a configuration is composed of an airtight member 80 having a plurality of ribs 83, 84, and 85 as shown in FIG. The casing 20 and the casing cover generated by the rotation of the impeller 10 when the centrifugal pump is driven when the shape of one state, that is, the first lip 83 and the second lip 84 are directed inwards ( 30) the first lip 83, the second lip 84 and the airtight material 80 of the airtight material 80 when the pressure of the internal pressure, that is, the pressure of the pressure water gradually increases as the rotation time of the impeller 10 increases. The third lip 85 is deformed toward the outside by being pushed by the pressure water.

In more detail, the first lip 83 and the second lip 84 are deformed outward by the number of pressures of the casing 20 and the casing cover 30 to form a fine gap, and at this time, the first lip 83 The leak that has passed through the lip 83 decreases to some extent when passing through the second lip 84, and then the pressure becomes smaller when passing through the third lip 85, so that the amount of leakage actually Very few.

At this time, since the first lip 83 and the second lip 84 are molded to face inward, the first lip 83 and the second lip 84 are bent toward the outside (suction opening 21 side) while being expanded and deformed by the pressure water. ), The inner diameter of the c) is reduced so that the inner diameter of the impeller 10 is more strongly pressed against the flat surface portions 16 and 17 of the impeller 10. Thereby, the pressure water in the casing 20 and the casing cover 30 is prevented from leaking to the suction port 21 side positively.

As described above, according to the wear ring structure of the centrifugal pump of the present invention, since an airtight member made of an elastic rubber material is provided between the impeller inlet end and the casing inlet of the centrifugal pump, the manufacturing cost can be reduced, and moreover, a plurality of ribs are integrated. By forming a multi-stage sealing structure, the leakage loss can be minimized, which improves the efficiency of the pump. Since it is not a metal wear ring structure, the motor operates smoothly without restraint caused by rust, even when starting after prolonged operation. It is effective in improving the reliability of the pump.

The principles of the present invention have been presented thus far, including structural details and the multifunctional advantages obtained therefrom. It will be appreciated by those skilled in the art to use the wear ring structure of the centrifugal pump of the present invention as a wear ring of a general pump.

Claims (7)

In the wear ring structure of a centrifugal pump including at least a casing incorporating an impeller, Wearing structure of the centrifugal pump characterized in that the elastic airtight member is installed between the impeller and the casing and the casing cover. The method of claim 1, The hermetic material is elastic rubber with elasticity, and is installed between each seating portion formed on the casing and the casing cover and a flat surface portion formed on the left and right ends of the impeller. The method of claim 1, The hermetic material has a reinforcing body for strength reinforcement, characterized in that the wear ring structure of the centrifugal pump. The method of claim 3, The reinforcing body is a wear ring structure of the centrifugal pump, characterized in that the 'b' shaped cross-sectional shape. The method of claim 1, The hermetic material is provided with a predetermined number of ribs on the side in contact with the impeller, the wear ring structure of the centrifugal pump. The method of claim 5, The predetermined number of ribs comprise a 1st, 2nd, and 3rd rib, The wear ring structure of the centrifugal pump characterized by the above-mentioned. The method of claim 6, The first and second lips are inclined to one side with respect to the flat surface portion of the impeller, and the third lip is a wear ring structure, characterized in that the vertical formation.