KR102633066B1 - A suction bell for a pump - Google Patents

Abstract

The present invention relates to a submersible pump, which includes a drive shaft rotated by a motor and an impeller mounted on the drive shaft and surrounded by a casing, which is mounted adjacent to the end of the impeller and supported by the casing. suction bell; And a detachable sleeve may be provided on a portion of the inner surface of the suction bell.

Description

Suction bell for a pump {A suction bell for a pump}

The present invention relates to a suction bell, which is a suction pipe installed underwater and injects and discharges fluid.

In general, a pump is a device that transports fluid to a desired location using power provided from the outside or by applying pressure to the fluid, and can be divided into vertical pumps, submersible pumps (axial flow, oblique flow), etc.

In the case of the vertical axis pump and submersible pump, the suction pipe of the pump is located underwater due to the structural characteristics of the pump, and the fluid is sucked through the suction pipe to transport the fluid to a desired location.

In this case, since the suction pipe is located underwater, if the minimum required water level is not secured due to the suction performance of the submersible pump, air is sucked in along with the fluid, thereby generating cavitation inside the suction pipe, and this Due to cavitation, some areas inside the suction pipe are eroded and cracked or damaged.

Looking more closely, cavitation is a phenomenon in which the static pressure of a certain part of flowing water falls below the vapor pressure corresponding to the temperature of the water, causing the water to evaporate and the air infiltrated into the water to form bubbles due to the low pressure.

Looking at the factors that cause this cavitation phenomenon in a submersible pump, a pressure drop occurs within the pump during the process of being sucked in from the suction pipe and discharged to the discharge pipe, and when it falls below the saturation vapor pressure, bubbles are generated, and the pressure gradually increases. When ground bubbles burst (hereinafter collectively referred to as 'bubble explosion'), noise and vibration are generated, and the impeller blades and some areas of the suction pipe are eroded by the bubble explosion.

Additionally, when the suction pipe is not sufficiently submerged and the water level is insufficient to match the suction force, air is sucked into the pump's suction pipe and bubbles are created, which erodes the impeller blades and some areas of the suction pipe.

Accordingly, as shown in FIG. 1, the suction pipe cannot exert the required suction pressure due to some areas being eroded due to cavitation, thereby deteriorating the performance of the submersible pump and accompanied by noise and/or vibration. There is a problem that reduces the durability of the submersible pump, causes damage, and ultimately shortens the service life of the submersible pump.

Due to this problem, the submersible pump can only be used by replacing the entire suction pipe in which some areas have been eroded due to cavitation, and for this, the entire suction pipe in some areas has been eroded, which is a problem of the complexity of the work. there is.

Additionally, by replacing the entire suction pipe in which some areas are eroded, there is a problem that maintenance costs are added as the entire suction pipe must be purchased.

The present invention is a pump that provides the convenience of maintenance work by installing a detachable sleeve in a part of the suction pipe where erosion occurs due to cavitation, so that only the sleeve, not the entire suction pipe, is replaced when erosion occurs due to long-term use. A suction bell is provided.

In addition, the present invention provides a suction bell for a pump that reduces maintenance due to replacement of only the sleeve, not the entire suction pipe, by replacing only the sleeve that is eroded due to cavitation.

The problems to be solved by the present invention are not limited to those mentioned above, and other problems to be solved that are not mentioned can be clearly understood by those skilled in the art from the description below. will be.

In order to solve the problem to be solved above, the suction bell for a pump according to an embodiment of the present invention is connected to a pump including a drive shaft rotated by a motor and an impeller mounted on the drive shaft and surrounded by a casing. In a suction bell into which fluid flows as it rotates, the suction bell is mounted adjacent to an end of the impeller, is supported by the casing, and may include a detachable sleeve in a portion of the inner diameter.

According to an embodiment of the present invention, the suction bell has a first suction part formed on the inside to allow initial suction of fluid through driving of the impeller, and a discharge bell formed in an area adjacent to the casing to direct the suctioned fluid. It guides the sleeve to be transferred to the side, and includes a second suction part having a seating part to which the sleeve is attached and detachable; The sleeve can be attached and detached to the second suction part so that both ends are connected and there is a predetermined space between the two ends.

According to an embodiment of the present invention, the seating portion is formed through tapering of a portion of the inner diameter where the sleeve is to be seated, and the sleeve may be formed through tapering to be detachable from the seating portion.

According to an embodiment of the present invention, the position of the seating portion is determined using data on the area where erosion occurs obtained through driving the pump, and may be formed to have a certain depth.

According to an embodiment of the present invention, the suction bell includes a first flange configured at one end and supported to be fixed to one end of the casing by a fastening means, and the seating portion includes a first seating groove in which the sleeve is seated and the sleeve. It includes a second seating groove in which the second flange is seated, and the second seating groove includes a plurality of first fastening holes that support the sleeve to be fastened to the suction bell by a fastening means, and the sleeve has a predetermined length. It may include a column formed to support the sleeve to be seated in the first seating groove, and a second flange formed at one end of the column to support the sleeve to be fastened to the suction bell by a fastening means.

According to an embodiment of the present invention, if the suction bell has a tensile strength of 200 or more, it is GC200 with a cast iron component containing flake graphite; The sleeve may include SSC13, a magnetic stainless steel cast steel.

According to the above-described means of solving the problem of the present invention, a detachable sleeve is installed in a part of the suction pipe where erosion occurs due to cavitation, so that when erosion occurs due to long-term use, only the sleeve is replaced, not the entire suction pipe. It has the effect of improving the convenience of repair work.

In addition, according to the means for solving the problem of the present invention described above, there is an effect of reducing maintenance due to replacement of only the sleeve, not the entire suction pipe, by replacing only the sleeve in which erosion has occurred due to cavitation.

In addition, according to the means for solving the problem of the present invention described above, a detachable sleeve is provided in some areas of the suction pipe, so that when erosion due to cavitation, etc. occurs, only the sleeve can be replaced and continued use, thereby extending the service life of the pump. It has the effect of prolonging.

Figure 1 is an actual photo of a conventional submersible pump suction bell.
Figure 2 is a diagram showing an example of a submersible pump according to the first embodiment of the present invention.
2a is a drawing of a submersible pump, and 2b is a drawing of a vertical pump.
Figure 3 is an exploded cross-sectional view of the suction bell and sleeve according to the first embodiment of the present invention.
Figure 4 is a cross-sectional view showing the combination of a suction bell and a sleeve according to the first embodiment of the present invention.
Figure 5 is an exploded cross-sectional view of the suction bell and sleeve according to the second embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The detailed description below is provided to provide a comprehensive understanding of the methods, devices and/or systems described herein. However, this is only an example and the present invention is not limited thereto.

In describing the embodiments of the present invention, if it is determined that a detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification. The terminology used in the detailed description is merely for describing embodiments of the present invention and should in no way be limiting. Unless explicitly stated otherwise, singular forms include plural meanings. In this description, expressions such as “comprising” or “comprising” are intended to indicate certain features, numbers, steps, operations, elements, parts or combinations thereof, and one or more than those described. It should not be construed to exclude the existence or possibility of any other characteristic, number, step, operation, element, or part or combination thereof.

Hereinafter, a pump to which a pump suction bell is applied will be described with reference to the attached drawings.

<First embodiment>

As shown in FIG. 2, the pump of the first embodiment, for example, a submersible pump, includes a casing (1), a drive shaft (2), an impeller (3), a suction bell (10), and a sleeve (20). It can be configured.

The pump may be a submersible diagonal flow pump as shown in FIG. 2A or a vertical axis diagonal flow pump as shown in FIG. 2B, but is not limited thereto. That is, the submersible pump according to the embodiment of the present invention may be any fluid transfer means equipped with a suction bell 10, which is a suction pipe located in water.

The casing 1 may be configured to form an exterior and protect the interior. In addition, the casing 1 may be configured with sealing parts such as mechanical seals, oil seals, O-rings, etc. at joints to maintain airtightness inside.

In addition, the casing 1 may be equipped with a suction bell 10 to support suction of fluid at one end, and a discharge bell to support the suctioned fluid so that it can be discharged by applying pressure to the other end. The suction bell 10 or discharge bell can be configured to be fastened and separated through fastening means, for example, a plurality of bolts and nuts, so that maintenance can be performed.

The drive shaft 2 may be configured to be rotatable in the center of the casing 1 and configured to rotate by rotational force provided from a motor. In this case, the drive shaft 2 may be equipped with a bearing, column, bushing, etc. to support rotation.

The impeller 3 is mounted on one end of the drive shaft 2, that is, the part where the suction bell 10 is formed, and provides suction force by co-rotation with the rotation of the drive shaft 2, thereby providing suction power to the suction bell 10. ) may be configured to allow fluid to be sucked through. The impeller 3 may have various shapes or configurations depending on the purpose of use of the submersible pump, the environment of use, the shape of the casing 1, or the required suction power.

The suction bell 10 may be mounted on one end of the casing 1 to provide a passage through which fluid is sucked as the impeller 3 rotates.

As shown in FIGS. 3 and 4, the suction bell 10 may form the first suction part 110 where fluid is initially suctioned. In this case, the first suction part 110 is wide at one end and gradually narrows in the direction of fluid transfer, that is, it may be formed in an upper-lower narrow shape.

The suction bell 10 may include a second suction part 120 that supports the suction of the fluid sucked through the first suction part 110. In this case, the second suction part 120 may be formed in a shape that starts from the end of the first suction part 110 and gradually becomes wider in the direction of fluid transfer, that is, in the shape of an upper and lower beam.

At this time, the sleeve 20 may be mounted on the second suction part 120 as damage due to cavitation mainly occurs. That is, the second suction part 120 may be provided with a seating part 122 having a certain depth so that the sleeve 20 can be smoothly seated on the outer diameter. Here, the seating portion 122 may be formed through tapering of a portion or the entire area of the second suction portion 120.

In addition, the seating portion 122 may include a first fastening hole 124 that supports the sleeve 20 to be firmly fixed to the seating portion 122 by a fastening means after the sleeve 20 is seated. You can. In some cases, the first fastening hole 124 may not be provided in the seating portion 122, and the sleeve 20 may be fixed to the seating portion 122 using adhesive or interference fit.

For example, the seating portion 122 can be divided into a first seating groove 1222 in which the column of the sleeve 20 is seated, and a second seating groove 1224 in which the second flange of the sleeve 20 is seated. . In this case, the first fastening hole 124 may be formed in the second seating groove 1224 at a certain depth to support fastening of the fastening bolt.

In addition, the formation position of the seating portion 122 or the mounting position of the sleeve 20 is determined through data acquired through driving a submersible pump, that is, data on the area within the suction bell 10 where erosion occurs due to cavitation. can do.

One end of the suction bell 10 may include a first flange 130 that supports one end of the casing 1 so as to be in close contact with each other.

The first flange 130 is formed at one end of the suction bell 10, that is, a portion in close contact with one end of the casing 1, and supports it to facilitate coupling with the casing 1.

In addition, the first flange 130 has a plurality of radial configurations, so that it can be attached to and detached from the casing 1 by fastening means, such as bolts and nuts, making maintenance of the suction bell 10 easy. A second fastening hole can be configured to allow this.

In addition, the suction bell 10 has a cast iron component containing flake graphite with a tensile strength of 200 or more, and may be formed of a material of GC200, for example. Of course, it is not limited to this, and the material of the suction bell 10 may change depending on the purpose of use, use environment, etc.

The sleeve 20 is mounted on a partial area of the suction bell 10 that may be lost due to cavitation acting on the suction bell 10 by an impeller, etc., so that the sleeve 20 is not replaced without replacing the entire suction bell 10. By replacing only (20), the convenience of maintenance work and maintenance costs can be reduced.

The sleeve 20 may be formed through tapering to have an inclined area corresponding to the seating portion 122 through tapering. That is, the sleeve 20 may be formed into a shape that can be fastened to the second seating groove 1224 of the seating portion 122 through tapering of the column 210 portion, as shown in FIGS. 3 and 4. Likewise, it may include a column 210 formed inclined to a certain length, and a second flange 220 formed at one end of the column 210.

The column 210 is formed to have a certain length and can support the inside to guide the transfer of fluid sucked through the first suction part 110 of the suction bell 10. In this case, the column 210 may be seated in the first seating groove 1222 of the second suction part 120 of the suction bell 10. Additionally, the column 210 may be formed through tapering.

The second flange 220 is formed at one end of the column 210 and supports stable seating on the seating portion 122 formed on the second suction portion 120 of the suction bell 10. In this case, the second flange 220 may be seated in the second seating groove 1224 of the seating portion 122.

Additionally, a bolt hole may be formed in the second flange 220 at the same position as the first fastening hole 124 formed in the seating portion 122 to support fastening of the fastening means.

In addition, the sleeve 20 is made of a magnetic stainless steel cast steel material. For example, it may be made of SSC13 material, but is not limited thereto.

In the submersible pump configured as above, the suction bell 10 is fixed to one end of the casing 1 by a fastening means.

Then, the sleeve 20 is mounted on the second suction portion 120 formed in a partial area inside the suction bell 10, that is, the portion where the impeller 3 is located.

That is, the column 210 of the sleeve 20 is seated in the first seating groove 1222 formed in the seating portion 122 of the second suction portion 120, and the sleeve (210) is seated in the second seating groove 1224. The second flange 220 of 20) is seated.

In addition, as the fastening means is fastened to the bolt hole of the second flange 220 and the first fastening hole 124 of the second seating groove 1224, the sleeve 20 is formed in a partial area of the suction bell 10. It is fixed.

Afterwards, if loss such as damage to the sleeve 20 occurs due to cavitation caused by the impeller 3, etc., the suction bell 10 is separated from the casing 1 and the second suction part of the suction bell 10 is removed. The sleeve 20, which is fastened and fixed to (120) by the fastening means, is removed. That is, by separating the fastening means from the sleeve 20 so that the sleeve 20 can be replaced in the second suction part 120, maintenance costs can be reduced along with convenience of maintenance work. Let it happen.

<Second Embodiment>

The same reference numerals are used for the same components as those in the first embodiment, and detailed description thereof is omitted.

As shown in FIG. 5, the sleeve 20 of the second embodiment may include an insertion groove 212 formed at a certain depth at one end of the outer diameter of the column 210.

The insertion groove 212 is formed at a certain depth from the outer diameter of the column 210 to allow the sealing ring 230 to be inserted into the inside, thereby connecting the second suction part 120 of the suction bell 10 and the sleeve ( 20) Ensure confidentiality between the two. In this case, the insertion groove 212 may be configured in a position symmetrical to the second flange 220.

The sealing ring 230 is inserted into the insertion groove 212 to ensure airtightness between the second suction part 120 and the sleeve 20 of the suction bell 10. Supports to prevent loss of suction pressure. In this case, the sealing ring 230 may be formed of silicon, rubber, etc. having high elasticity. Of course, it is not limited to this, and the sealing ring 230 can be made of any material that ensures airtightness between the second suction part 120 of the suction bell 10 and the sleeve 20. . In some cases, a mechanical seal structure may be adopted between the second suction part 120 and the sleeve 20.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations can be made by those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments expressed in the present invention do not limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas that are equivalent or within the equivalent scope should be construed as being included in the scope of rights of the present invention.

10: Suction bell 110: First suction part
120: second suction part 122: seating part
1222: First seating groove 1224: Second seating groove
124: First fastening hole 130: First flange
20: sleeve 210: column
212: Insertion groove 220: Second flange
230: Sealing ring

Claims (5)

In the suction bell, which is connected to a pump including a drive shaft rotated by a motor and an impeller mounted on the drive shaft and surrounded by a casing, into which fluid flows in as the impeller rotates,
The suction bell is mounted on one end of the casing and is manufactured using a cast iron component containing flake graphite whose tensile strength is greater than a preset value, and is mounted adjacent to the end of the impeller and supported by the casing,
The suction bell is detachable from a portion of the inner diameter and includes a sleeve made of magnetic stainless steel cast steel,
In the case of the suction bell, a first suction part formed on the inside to allow initial suction of fluid through driving of the impeller, and a first suction part formed in an area adjacent to the casing to guide the suctioned fluid to be transferred to the discharge bell, It includes a second suction part having a seating part to which the sleeve is detachable, and a first flange formed at one end and supported to be fixed to one end of the casing by a fastening means,
In the case of the sleeve, it is attached and detachable to the second suction part so that both ends are connected and there is a predetermined space between both ends, and is formed to a certain length so that it is seated in the first seating groove. supporting columns; And a second flange formed at one end of the column to support the sleeve so that it can be fastened to the suction bell by a fastening means,
In the case of the seating portion, a first seating groove in which the sleeve is seated and a second flange of the sleeve are seated, and a second seat having a plurality of first fastening holes for supporting the sleeve to be fastened to the suction bell by a fastening means. Includes a groove,
A suction bell for a pump, wherein the position of the seating part is determined using data on the area where erosion occurs obtained through driving the pump, and the seat is formed to have a certain depth at the determined position.
delete According to paragraph 1,
The seating portion is formed through tapering of a portion of the inner diameter where the sleeve is to be seated,
A suction bell for a pump, characterized in that the sleeve is formed through tapering so that it is detachable from the seating portion.
delete delete

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