KR102173467B1 - Multistage pump - Google Patents

Abstract

The present invention relates to a multi-stage pump, having a pump main body (100) which comprises: a power transmission unit composed of a driving motor (M) and a rotational shaft; a pumping operation assembly having an intermediate case storing an impeller therein, allowing the formed intermediate case to be inserted and coupled onto the rotational shaft in a plurality of parallel arrangement close attachment structures so as to allow the impeller stored inside the intermediate case to be coupled onto the rotational shaft in a key-fixing structure; an introduction guide casing coupled to a cross-section of one side of the pumping operation assembly; and a discharge guide casing coupled to the cross-section of the other side of the pumping operation assembly. The multi-stage pump has a cap type sealing and fastening unit which allows the introduction guide casing and the discharge guide casing to be assembled and fixated to face each other while spaced from each other, and the introduction guide casing has an upper inlet and an introduction chamber having an inner volute structure and has an outer body formed as an introduction close attachment frame having an octagonal block structure. An introduction fastening hole, where the cap type sealing and fastening unit is assembled, penetrates the circumference of an outer surface of the introduction close attachment frame having the octagonal block structure, and the cap type sealing and fastening unit is disposed at a portion adjacent to four hypotenuses except left, right, upper, and lower sides in the octagonal block structure. An introduction casing connector, which is composed of an introduction unit close attachment flange and an introduction unit insertion close attachment pipe, is formed at a center portion of the introduction close attachment frame.

Description

Multistage pump

The present invention relates to a multistage pump, and more particularly, to ensure the stability of fluid flow, and the inflow guide casing and the discharge guide casing formed by a multistage pump by thrust and vibration generated inside the casing when fluid flows inside the casing. It relates to a multistage pump capable of preventing the loosening of the fastening fixing means.

In general, a pump refers to a device that changes the position of a liquid by receiving pressure energy from a prime mover such as an electric motor or an internal combustion engine, and it can be seen that it is largely classified into a turbo-type pump and a positive displacement pump.

Here, the turbo pump imparts kinetic energy to the liquid introduced by the rotational force of an impeller having a vane, and converts the liquid given kinetic energy into pressure energy through a spiral casing. It refers to a type of pump, and such a turbo pump is classified into a centrifugal pump, a sagittal pump, and an axial pump.

In addition, the positive displacement pump means a pump having a space in the reciprocating unit or the rotating unit and introducing a fluid into the space, and the positive displacement pump is divided into a reciprocating pump and a rotary pump.

At this time, in the turbo-type pump described above, the centrifugal pump is further divided into a single-stage pump and a multi-stage pump according to the number of impellers that give rotational force. In this classification, the single-stage pump is a pump having only one impeller. It is mainly used for a low lift, and a multistage pump is a type of pump that sequentially increases pressure by installing a plurality of impellers on one shaft, and is mainly used for a high lift.

On the other hand, in various types of pumps as described above, in particular, when looking at the configuration of a multi-stage pump, which is a type of centrifugal pump, in a more subdivided manner, it is balanced on a rotation axis of a predetermined length that performs a rotational action by motor drive. The seat, the diffuser, the casing ring, and the intermediate case in which the impeller is accommodated are sequentially inserted in close contact with each other in a plurality of row arrangement structures, and the impellers accommodated in the intermediate cases are fixedly installed on the rotating shaft; After axially coupling an inlet induction casing provided with an inlet port on one side of the rotation shaft to which the plurality of intermediate cases are coupled, and a discharge induction casing provided with a discharge port on the other side of the driving side opposite to the inlet induction casing, they, the inlet induction casing It consists of a structure in which the and discharge induction casings face each other and are fastened and fixed by stay bolts.

However, as described above, in the conventional multistage pump, the fastening structure of the stay bolt for fixing the inflow induction casing and the discharge induction casing is a simple bolt and nut, for example, the coupling portion of the nut coupled with the bolt end is externally The structure is exposed as it is, and therefore, various dust or moisture (water) flows into the gap between the bolt and nut fastening part, and there is a closed end where corrosion easily occurs. When disassembling the multi-stage pump for maintenance or replacement of parts as it is difficult to loosen the part, there is a problem of considerable structural defects, such as making the disassembly work difficult.

In addition, as described above, in the conventional multi-stage pump, a plurality of assemblies in which the coupling structure of the inflow induction casing and the discharge induction casing is arranged in parallel on the drive shaft, for example, is in simple contact with one side and the other side of the intermediate casing, and is in close contact with the stay bolt. Therefore, when the stay bolt's clamping force is weak or the stay bolt is slightly loosened due to the continuous vibration action of the multi-stage pump operation, the inflow guide casing and the discharge guide casing are closely contacted. There is a problem of severe durability degradation caused by a leak phenomenon at the joint.

Alternatively, as described above, the conventional multi-stage pump, as shown in FIG. 1, takes a method of combining an intermediate casing, a suction casing, and a discharge casing using a plurality of stay bolts. In the case of a structure, there is a closed end in which the bolt is easily corroded or abraded as the stay bolt passes through some of the volute parts through which the fluid flows, and the fluid flow becomes unstable, causing vibration of the pump during initial operation. It always exists.

Korean Patent Registration No. 1145417 Republic of Korea Patent Registration No. 1607301

The present invention was devised to solve the problem of structural defects of the conventional multi-stage pump, and a sealing unit for fixing and assembling the inflow induction casing and the discharge induction casing is formed in a position where it does not pass through the volute position, thereby improving the stability of fluid flow. It is to provide a multistage pump that can be secured,

In addition, in the present invention, the inflow and contact frame of the casing is designed in an octagonal block structure, and a sealing fastening unit is arranged at the hypotenuse part of the octagonal block structure except for the upper and lower left and right sides, and assembled and fixed in the inflow fastening hole, while maintaining the fastening force. It is to provide a multistage pump capable of minimizing the sealing unit, which is a fastening means.

In addition, in the present invention, by forming the configuration of the stay bolt as a cap-type sealing unit that prevents the inflow of external dust or moisture (water), it is possible to prevent corrosion of the gap at the fastening part due to the inflow of dust or moisture, as well as the cap-type sealing fastening. It is to provide a multistage pump capable of preventing loosening of the fastening means by forming a drain through which air can escape in the unit.

In addition, in the present invention, the assembly structure of the inflow guide casing and the discharge guide casing is formed into a double sealing structure by a close contact frame, for example, a sturdy assembly structure in which cross-sectional contact and insertion contact are simultaneously formed, so that unnecessary leakage can be prevented at the source. It is to provide a multistage pump.

Accordingly, the multi-stage pump according to an embodiment of the present invention for achieving the above object includes a power transmission unit consisting of a drive motor (M) and a rotating shaft; A pumping operation assembly in which an intermediate case in which the impeller is accommodated is formed, and the formed intermediate case is inserted and coupled to the rotation shaft in a plurality of row-line contact structures, and the impellers accommodated in the intermediate case are coupled to the rotation shaft in a key fixing structure. Wow; An inflow induction casing coupled to one end surface of the pumping operation assembly; In the multi-stage pump comprising a pump body 100 consisting of a discharge induction casing coupled to the other end of the pumping operation assembly, the inflow induction casing and the discharge induction casing are assembled and fixed in a spaced opposite structure to form a cap-type sealed fastening unit. And, the inflow induction casing is configured to include an inlet chamber having an upper inlet and an inner volute structure, and the outer body is formed as an inlet contact frame having an octagonal block structure; Formed through the inlet fastening hole through which the cap-type sealing fastening unit is assembled around the outer surface of the inflow contact frame having the octagonal block structure, and the cap-type sealing at a portion adjacent to the four hypotenuses excluding the top, bottom, left and right sides of the octagonal block structure A fastening unit is disposed to penetrate through the inlet fastening hole, and an inlet casing connector formed of an inlet fitting flange and an inlet fitting fitting pipe is formed in the central portion of the inlet fitting frame.

According to an embodiment of the present invention, the cap-type sealing fastening unit includes a gap maintaining rod having male threads (N) formed on one side and the other side of the outer diameter surface; The male screw (N) may be composed of a closing cap made of a fastening mechanism provided with a pressure evacuation hole is provided in the center portion of the receptor tube that is fastened by receiving the end.

According to an embodiment of the present invention, the cap-type sealing fastening unit constitutes a configuration divided into two on each of four hypotenuses, and the inflow guide casing and the discharge guide casing are assembled and fixed in a spaced opposite structure.

According to an embodiment of the present invention, the discharge induction casing has a configuration including an upper discharge port and an inner discharge chamber, and the outer body is formed as a discharge contact frame having an octagonal block structure; Through the eight discharge fastening holes in which the cap-type sealing fastening unit is assembled around the outer surface of the discharging contact frame having the octagonal block structure, the octagonal block structure is formed at a portion adjacent to the four hypotenuses excluding the upper and lower left and right sides. It is characterized in that the cap-type sealing fastening unit is disposed and formed through the discharge fastening hole, and is formed by a discharge casing connector made of a discharge part contact flange and a discharge part insertion contact tube at the center of the discharge contact frame.

According to the embodiment of the present invention as described above, the sealing unit for fixing the inflow induction casing and the discharge induction casing is formed in a position where it does not pass through the volute position, so that the stability of the fluid flow can be secured.

In addition, according to the embodiment of the present invention as described above, the inflow contact frame of the casing is designed in an octagonal block structure, and a sealing unit is disposed on the hypotenuse part of the octagonal block structure except for the upper and lower left and right sides, so that the inflow tightening hole By assembling and fixing to, it is possible to minimize the sealing fastening unit as a fastening means while maintaining the fastening force.

In addition, according to the embodiment of the present invention as described above, by forming the configuration of the stay bolt as a cap-type sealing unit that prevents the inflow of external dust or moisture (water), corrosion of the gap in the fastening portion due to the inflow of dust or moisture Not only can it be prevented, but also by forming a drain through which air can escape from the cap-type sealing unit, it is possible to prevent the stay bolt from loosening.

In addition, according to the embodiment of the present invention as described above, the assembly structure of the inflow guide casing and the discharge guide casing is formed into a double sealing structure by means of a close contact frame, for example, a sturdy assembly structure in which cross-sectional contact and insertion contact are simultaneously performed. Water leakage can be prevented at the source.

1 is a configuration diagram of a conventional multistage pump.
2 is a partial exploded perspective view of a multistage pump according to an embodiment of the present invention.
3 is a schematic configuration diagram of an induction induction casing and a discharge induction casing applied to the present invention.
4 is an internal assembly configuration diagram of a multistage pump according to an embodiment of the present invention.
5 is a cross-sectional view of a main part of a multistage pump according to an embodiment of the present invention.
6 is an internal configuration diagram of an inlet chamber applied to the present invention.

The following detailed description is provided to aid in 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, when it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification. The terms used in the detailed description are only for describing embodiments of the present invention, and should not be limiting.

Unless explicitly used otherwise, expressions in the singular form include the meaning of the plural form. In this description, expressions such as “comprising” or “feature” are intended to refer to certain features, numbers, steps, actions, elements, some or combination thereof, and one or more other than those described. It should not be construed to exclude the presence or possibility of other features, numbers, steps, actions, elements, any part or combination thereof.

Hereinafter, a configuration of a preferred embodiment of a multi-stage pump according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a partial exploded perspective view of a multistage pump according to an embodiment of the present invention, FIG. 3 is a schematic configuration diagram of an induction inlet casing and a discharge induction casing applied to the present invention, and FIG. 4 is a multistage according to an embodiment of the present invention It is an internal assembly configuration diagram of the pump, Figure 5 is a cross-sectional view of the main portion of the multi-stage pump according to an embodiment of the present invention, Figure 6 is an internal configuration diagram of the inlet chamber applied to the present invention.

As shown in Figures 2 to 6, looking at the schematic configuration of a multi-stage pump that promotes the stability of the fluid flow and improves the fastening force according to the embodiment of the present invention, it is, the power transmission unit 1 and the pumping It consists of an operation assembly (2), an induction induction casing (3), a discharge induction casing (4), and a sealing unit (5).

Here, first, the power transmission unit 1 is a means for controlling the operation of the multi-stage pump according to an embodiment of the present invention by an external electrical energy source, such, the power transmission unit 1 is shown in FIG. As described above, it is preferable to form a drive motor (M), which is a power generating means, and a rotation shaft 11 of a predetermined length that performs a rotational action by power transmission from the drive motor (M). Is the key fixing groove)

In addition, the pumping operation assembly 2 is a conventional pumping means for obtaining a high head or high pressure water by increasing the pressure by the high-speed rotational action of the rotary shaft 11, as described above, such a pumping operation assembly 2 First, to form an intermediate case 21 of a cylindrical structure accommodating a balance sheet, a diffuser, and a casing ring, together with an impeller 211 corresponding to a kind of rotating blade, and again, the formed intermediate case 21 As shown in FIG. 4 on the above-described rotation shaft 11, by inserting and coupling a plurality of rows in close contact structure, each impeller 211 accommodated in the intermediate case 21 is regularly and repeatedly placed on the rotation shaft 11 It is preferable to form a structure in which a plurality of key fixing structures are combined.

At this time, in the above-described pumping operation assembly (2), the impeller 211, the balance sheet, the diffuser, and the casing ring have the same configuration that is not different from a component applied to a conventional multi-stage pump, thus , For convenience of explanation, drawings of the balance sheet, diffuser, and casing ring excluding the impeller 211 and their specific functions and structures will be omitted.

On the other hand, in the inflow induction casing 3 in the embodiment of the present invention, the inflow chamber 32 has a volute structure as shown in FIG. 6, for example, by generating a vortex in the fluid to smooth suction force. It is formed as a kind of vortex induction structure that makes it exert.

The inflow induction casing 3 is a means for receiving raw water from an external water supply means (not shown) in order to obtain high head or high pressure water. As such, the inflow induction casing 3 is shown in FIG. 3 or 5. As shown, an inlet 31 is formed on the upper surface, an inlet chamber 32 of a predetermined space is formed on an inner surface connected to the inlet 31, and the inlet 31 and the inlet chamber 32 Forming an inlet contact frame 33 of an octagonal block structure (ie, an octagonal shape) with an exterior body structure formed therein;

As shown in FIG. 3 or 5, the eight inlet fastening holes 331 in which the cap-type sealing fastening unit 5 to be described later is assembled around the outer surface of the inflow contact frame 33 having the octagonal block structure Formed through a repetitive and repetitive arrangement;

Again, it is preferable to further form an inlet casing connector 34 consisting of an inlet fitting flange 341 and an inlet insert fitting pipe 342 at the center of the inlet contact frame 33 as shown in FIG. 5. .

In addition, a total of eight cap-type sealing fastening units 5 may be formed by forming two at each of the hypotenuse portions excluding the upper and lower left and right sides in the octagonal block structure. Accordingly, the inlet fastening hole 331 may be formed in a position corresponding to the total of eight cap-type sealing fastening units (5).

Through this fastening structure, since the cap-type sealing unit 5 is not disposed in the volute position, it is possible not only to ensure the stability of fluid flow, but also to prevent corrosion and abrasion of the cap-type sealing unit 5 by fluid. In addition, it is possible to minimize the occurrence of vibration of the multistage pump during initial operation (when inhaling fluid).

In addition, the discharge induction casing 4 is a means for discharging and transmitting the high-pressure water whose pressure is increased by the above-described pumping operation assembly 2 to the outside, such that the discharge induction casing 4 is shown in FIG. Alternatively, as shown in FIG. 5, a discharge port 41 is formed on the upper surface, and a discharge chamber 42 of a predetermined space is formed on the inner surface connected to the discharge port 41, and the discharge port 41 and discharge Forming a discharging contact frame 43 of an octagonal block structure with an external body structure in which the thread 42) is formed;

As shown in Fig. 2, the eight discharge fastening holes 431 in which the cap-type sealing fastening unit 5 to be described later is assembled around the outer surface of the discharging close contact frame 43 having the octagonal block structure are regularly and repeated. Formed through an arrangement;

Again, it is preferable to further form a discharge casing connector 44 composed of a discharge part adhesion flange 441 and a discharge part insertion close tube 442 as shown in FIG. 5 in the center of the discharge contact frame 33 .

Finally, the hermetically fastening unit 5 is a means for assembling and fixing the inflow guide casing 3 and the discharge guide casing 4 in a mutually spaced opposite structure. As such, the hermetic fastening unit 5 , As shown in Fig. 3 or 5, forming a predetermined length of a gap holding rod 51 having a male screw (N) formed on one side and the other outer diameter surface, and in the gap holding rod 51, the male screw ( It is preferable to form a closing cap 52 that accommodates the end of N) and is fastened by a female screw method.

At this time, in the above-described sealing unit 5, the closing cap 52, as shown in Figure 2, the receptor tube 521 of a cylindrical structure in which a female screw is formed on the inner surface, and the receptor tube ( 521) A bolt-head-shaped fastening aid 521 is further protruded into an integrated clogging structure on one side, and a pressure evacuation hole (P) having a horizontal penetration structure is formed on the center surface of the fastening aid 521 It is desirable to do it.

This pressure evacuation hole (P) is formed by making a hole in the center of the end of the closing cap 52, and air is discharged when the gap maintaining rod 51 of the sealing unit 5 and the closing cap 52 are fastened. It can form a drain that can be. By discharging air through this drain, when the gap maintaining bar 51 corresponding to the bolt and the closing cap 52 corresponding to the nut are fastened, the gap maintaining bar 51 is pushed by the air inside the finishing cap 52. It can fundamentally block the occurrence of repulsion.

Therefore, as described above, looking at the mutual coupling relationship of the multi-stage pump according to an embodiment of the present invention consisting of a series of configurations are as follows.

First, the intermediate case 21 in which the impeller 211 is accommodated is inserted and coupled to the rotation shaft 11 provided as the power transmission unit 1 in a close contact structure in a plurality of rows, and the impeller 211 accommodated in the intermediate case 21 ) Forms a pumping operation assembly (2) in the form of a key fixing structure on the rotary shaft (11).

Subsequently, the inflow induction casing 3 is closely coupled to one end surface of the pumping operation assembly 2, the discharge induction casing 4 is closely coupled to the other end surface of the pumping operation assembly 2, and again, the pumping operation The inflow guide casing 3 and the discharge guide casing 4 in close contact with one end face of the assembly 2 and the other end face face each other, for example, an inlet fastening hole 331 and a discharge fastening hole 431 By assembling the sealing fastening unit 5 through the inflow guide casing 3 and the discharge guide casing 4 together in a fixed structure spaced apart from each other, the stability and fastening force of the fluid flow according to the embodiment of the present invention Implement an improved multistage pump (not shown in the drawing, 6 is a finishing member on one side, 7 is a finishing member on the other side)

At this time, as described above, in the coupling relationship, the inlet induction casing 3 is in close contact with one end surface of the pumping operation assembly 2, so that the inlet portion close flange 341 formed by the inlet casing connector 34 As shown in FIG. 5, the coupling portion, for example, one end of the pumping operation assembly 2 can be double-closed with a cross-sectional contact structure and an insert contact structure by the inlet and insertion contact tube 342.

In addition, as described above, in the coupling relationship, the discharge guide casing 4 is also in close contact with the other end surface of the pumping operation assembly 2, the discharge part close flange 441 formed of the discharge casing connector 44 ) And the discharge part insertion contact pipe 342, the coupling part, for example, the other end of the pumping operation assembly 2, as shown in FIG. 5, can be made double contact with a cross-sectional contact structure and an insert contact structure.

On the other hand, as a further explanation, the pressure evacuation hole (P) formed by the fastening inducement tool 521 in the above-described closing cap 52 is when the closing cap 52 is coupled to the male screw of the gap maintaining rod 51, By forming a drain that smoothly discharges the air remaining inside the coupling portion to the outside, a means for solving the problem of an incomplete connection state, for example, the air remaining compressed in the coupling portion of the gap maintaining rod 51 and the closing cap 52 , The pressure evacuation hole (P) and the spacing rod (51) are not fully coupled by the repulsive force of the compressed air to prevent the phenomenon from being easily released.

Therefore, the multi-stage pump according to the embodiment of the present invention made of the above-described coupling configuration, in having a series of use relations, the inflow guide casing 3 and the discharge guide casing 4 by the cap-type sealing fastening unit 5 ) To prevent the inflow of dust or moisture into the fixed gap of the fastening and corrosion, and, in addition, the inflow induction casing (3) and the pumping operation assembly (2), and the discharge induction casing (4) and the pumping operation assembly (2) It can be firmly coupled in cross-sectional contact and insertion contact, for example, a double contact structure.

1: power transmission unit 2: pumping operation assembly
3: Induction induction casing 4: Discharge induction casing
5: closed fastening unit 11: rotating shaft
21: intermediate case 31: inlet
32: inflow chamber 33: inflow contact frame
34: inlet casing connector 41: discharge port
42: discharge chamber 43: discharge contact frame
44: discharge casing connector 51: spacing rod
52: closing cap P: pressure evacuation hole

Claims (4)

A power transmission unit (1) consisting of a drive motor (M) and a rotation shaft (11); An intermediate case 21 in which the impeller 211 is accommodated is formed, and the formed intermediate case 21 is inserted and coupled to the rotation shaft 11 in a plurality of horizontally close structures, and accommodated in the intermediate case 21 A pumping operation assembly (2) having the impeller 211 coupled to the rotation shaft 11 in a key fixing structure; An inflow induction casing (3) coupled to one side of the pumping operation assembly (2); In the multi-stage pump comprising a pump body 100 consisting of a discharge induction casing (4) coupled to the pumping operation assembly (2) the other side,
Forming a cap-type sealing fastening unit 5 for assembling and fixing the inflow guide casing 3 and the discharge guide casing 4 in a spaced opposite structure,
The inflow induction casing (3) is configured to include an upper inlet (31) and an inlet chamber (32) having an inner volute structure, and the outer body is formed as an inlet contact frame (33) having an octagonal block structure. and;
The inflow contact frame 33 having the octagonal block structure is formed through the inflow fastening hole 331 through which the cap-type sealing unit 5 is assembled around the outer surface, except for the upper, lower left and right sides in the octagonal block structure. The cap-type sealing fastening unit 5 is disposed in a portion adjacent to the hypotenuse of the dogs and formed through the inflow fastening hole 331,
An inlet casing connector 34 made of an inlet fitting flange 341 and an inlet fitting pipe 342 is formed at the center of the inlet contact frame 33,
The discharge induction casing 4 is configured to include an upper discharge port 41 and an inner discharge chamber 42 formed, and the outer body is formed with a discharge contact frame 43 having an octagonal block structure;
Eight discharge fastening holes 431 through which the cap-type sealing fastening unit 5 is assembled are formed around the outer surface of the discharging contact frame 43 having the octagonal block structure, and the upper and lower left and right sides in the octagonal block structure The cap-type sealing fastening unit 5 is disposed in a portion adjacent to the four hypotenuses except for forming through the discharge fastening hole 431,
The discharge contact frame 43 is formed with a discharge casing connector 44 consisting of a discharge part contact flange 441 and a discharge part insertion contact pipe 442 at the center of the discharge contact frame 43,
The cap-type sealing fastening unit 5,
A spacing rod 51 having a male screw N formed on one side and the other side outer diameter surface;
It is composed of a closing cap 52 consisting of a receiving pipe 521 that is fastened while receiving the end of the male screw (N), and a fastening tool 522 provided with a pressure evacuation hole (P) in the central part,
The cap-type sealing and fastening unit (5) constitutes a configuration divided into two on each of the four hypotenuses, and the inflow guide casing (3) and the discharge guide casing (4) are assembled and fixed in a spaced opposite structure. Multi-stage pump. delete delete delete

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