KR200262387Y1 - Centrifugal pump - Google Patents

Abstract

According to the present invention, the bearing shaft of the synthetic resin and the sealing housing cap are used to seal the pump shaft so that leakage from the impeller chamber of the pump shaft is blocked so that the sealing means and the bearing portion do not need to be separately installed and thus assembled and disassembled. It provides a centrifugal pump that is easy to use and takes up a small space, and furthermore, the motor is directly supported and fixed to the pump casing by using an adapter, and the motor shaft and the pump shaft are directly fastened by using a clamp coupling to install or disassemble the assembly. Provided are centrifugal pumps that are easier and more convenient to center them.

The centrifugal pump has a pump casing rotatably provided with a pump shaft connected to rotate the impeller together, the centrifugal pump connected to the motor shaft on one side of the pump shaft to pump the fluid while the impeller is rotating at high speed, The sleeve having the sintered metal coating layer formed on at least a circumference of the other side of the pump shaft is fastened to be sealed, and the bearing metal is installed on the pump casing by the housing cap so that the outer circumferential surface of the sleeve is slid and rotated in a sealed state. The other side of the pump shaft is characterized in that it is configured to serve as sealing and shaft support without a separate packing.

Description

Centrifugal pump

The present invention relates to a centrifugal pump, and more particularly, by using a bearing metal of a synthetic resin material having heat resistance and abrasion resistance and a sealed housing cap to seal the pump shaft so that leakage of water from the impeller chamber of the pump shaft is blocked. There is no need to install the bearing part separately, so it is easy to assemble and disassemble and provide a centrifugal pump that takes up a small space. Furthermore, by using an adapter, the motor is directly supported and fixed to the pump casing and the clamp coupling is used to The present invention relates to a centrifugal pump in which the shaft and the pump shaft are directly fastened to facilitate installation or disassembly and further centering thereof.

In general, there are various types of pumps for building water supply, simple water supply, civil construction, fire extinguishing, general industrial use, and mine use. 1 relates to a multi-stage centrifugal pump, which is provided with a pump casing 1 having a plurality of impellers, each of which has an inlet 4 and an outlet 3. In addition, the pump shaft 2 for rotating the impeller protrudes out of the pump casing 1 and is connected to the motor shaft 6. The motor shaft 6 is rotated at high speed by the motor 5 and these motor shaft 6 and the pump shaft 2 are connected so as to rotate together by the coupling 7 or the like. In addition, the motor 5 and the pump casing 1 are separately fastened to the upper portion of the bed 8 by using bolts at the legs 5a, 5b; 1f, 1g.

In the conventional pump configured as described above, its rotational force is transmitted to the impeller inside the pump casing 1 via the motor shaft 6, the coupling 7 and the pump shaft 2 while the motor 5 is rotated at a high speed. At this time, when each impeller is rotated at a high speed, the water is introduced into the pump casing 1 through the suction port 4 and then compressed to high pressure and pumped toward the discharge port 3.

2 is a cross-sectional view of a conventional pump, in which each impeller 1a inside the pump casing 1 is rotated while being coupled to the pump shaft 2. And the pump shaft 2 is supported by the bearing part 1b which protrudes at both ends of the pump casing 1. These bearing portions 1b are fixed to the pump casing 1 via the bearing housing 1d. In addition, between the bearing housing 1d and the pump casing 1, a plurality of various packings 1c such as mechanical packings for preventing leakage are installed, and these packings 1c are bolted packing presses 1e. By holding the pump casing 1 in close contact with each other to maintain the sealing state.

However, the motor 5 and the pump casing 1 are fastened separately to the upper part of the bed 8 using bolts at the leg portions 5a, 5b; 1f, 1g, respectively, and the motor shaft 6 and In the conventional structure in which the pump shaft 2 is connected to rotate together by the coupling 7 or the like, the pump casing 1 and the motor 5, which are heavy objects, are fixed to the upper part of the bed 8 independently, Since the centers of these motor shafts 6 and pump shafts 2 must be matched and fixedly installed, the matching work is difficult, and the disassembly and assembly is difficult, and these shafts (2) and (6) Even if there is a slight center deviation (mismatch) in the noise, there is a problem that the noise is greatly generated, and furthermore, in order to prevent this, a rubber noise prevention piece is inserted in this case. There was a problem.

In the conventional structure, the pump shaft 2 is installed so that the packing 1c and the bearing portion 1b are separated, and the bearing housing 1d supporting the bearing portion 1b is provided on both sides of the pump casing 1. The protruding installation has the disadvantage that the overall volume of the pump is increased. In addition, since it is composed of packing or mechanical seal to block the leakage of the pump, there is an inconvenience of having to replace the packing regularly because there is a risk of leakage due to wear and weakening of the sealability after long use.

Accordingly, the present invention was developed in view of the above-described conventional problems, and an object of the present invention is to seal the pump shaft by using a bearing metal of a synthetic resin material having heat resistance and abrasion resistance and a sealed housing cap to seal the pump shaft. Water leakage from the impeller chamber is blocked, so there is no need to install the sealing means and the bearing part separately. Therefore, it is easy to assemble and disassemble and provides a centrifugal pump that takes up a small space. Furthermore, the adapter is used to directly connect the motor to the pump casing. The present invention provides a centrifugal pump that is easy to install or dismantle and to more easily center them by supporting and fixing and directly coupling a motor shaft and a pump shaft using a clamp coupling.

1 is a front view of a conventional multi-stage centrifugal pump

2 is an axial sectional view of a conventional multi-stage centrifugal pump

3 is a cross-sectional view of a multi-stage centrifugal pump according to an embodiment of the present invention

4 is an excerpt cross-sectional view of the bearing portion of FIG.

5 is an exploded perspective view of the clamp coupling of FIG.

FIG. 6 illustrates in detail the configuration of the adapter and clamp coupling portion of FIG. 3; FIG.

Enlarged section

7 is a cross-sectional view taken along the line A-A of FIG.

8 is a partial cross-sectional view showing another configuration of the matching means of FIG.

<Code Description of Main Parts of Drawing>

10 pump casing 11: pump shaft

12 impeller 16 sleeve

18: housing cap 19: bearing metal

21: motor 22: motor shaft

23 clamp coupling 26 bolt

27: adapter 10a, 21a: registration protrusion

27a, 27b: fixed plate portion 27c: connection portion

27d, 27e: Registration groove 27f: Assembly opening

27g: safety net 28: bed

In order to achieve the above object, the centrifugal pump according to an embodiment of the present invention passes through a pump casing in which a pump shaft connected to the impeller is rotatably rotatably installed, and is connected to the motor shaft of the motor at one side of the pump shaft so that the impeller In the centrifugal pump for pumping fluid while rotating at a high speed, a sleeve having a sintered metal coating layer formed on the circumference of the outlet port side journal of the pump shaft is fixedly sealed, and an outer circumferential surface of the sleeve is sealed and a relatively sliding rotational movement is performed. The bearing metal made of synthetic resin is fixedly installed to the pump casing by the housing cap, so that the sealing metal and the shaft support are combined at the discharge port side of the pump shaft without any packing.

The sleeve is preferably formed in a cup shape to be fixed to the discharge port side journal portion of the pump shaft via a bolt.

In addition, the centrifugal pump of the present invention passes through a pump casing in which a pump shaft connected to rotate with an impeller is rotatably installed, and is connected to a motor shaft of a motor at one side of the pump shaft to pump fluid while the impeller rotates at high speed. A pump, comprising: an adapter having the motor coupled directly to a pump casing and having an axially penetrating through space therebetween, and for fixing the motor shaft and the pump shaft of the motor protruding into the through space of the adapter together; Characterized in that it comprises a clamp coupling for.

In addition, the clamp coupling is composed of a pair of clamp coupling pieces separated in the axial direction to be coupled by a bolt, the adapter is the center shaft is matched through the matching projection and the coupling groove, the pump casing and the motor is fixed between And a connecting portion having an assembly opening portion for fixedly connecting the fixing plate portion between the fixing plate portion and assembling the coupling bolts of the pair of clamp coupling pieces separated in the axial direction, wherein the assembly opening portion rotates from the outside. It is desirable to mount a safety net at its connection to prevent access to the clamp coupling.

In this way, the installation space of the pump can be greatly reduced by the structure of the packing part and the bearing part, and the manufacturing cost can be reduced, and the resistance by the conventional packing can be removed to improve the performance, and the adapter It is easy to install and dismantle the motor and pump by centrifuging by, and in particular, when the embodiments of the present invention are applied to a multi-stage centrifugal pump connected with a large number of impellers, the installation space can be greatly reduced, and installation and disassembly are easy. Done.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view of the present invention pump. The pump casing 11 is provided with a pump casing 10 in which the impeller 12 is connected in multiple stages. The pump casing 10 is provided with an inlet 14 (shown to face upwards for convenience) in which water flows into each impeller 12, and a discharge port 13 through which the compressed water is discharged by the impeller 12, respectively. It is provided. In addition, the discharge port 13 side of the pump casing 10, because the discharge pressure of the water is large, there is a need for a structure that can block the leak while resisting the water pressure. Therefore, the bearing portion 15 must be provided with a condition that can support the pump shaft while resisting water pressure and blocking leakage.

In order to satisfy this condition, it is preferable that the bearing portion 15 on the discharge port side is secured to seal the sleeve 16 on the circumference of the journal, and the sleeve 16 is made of sintered metal body coated with tungsten. , The sleeve 16 is preferably formed in a cup shape as shown in Figures 3 and 4 so as to be secured to be sealed through the bolt 17 at the axial end of the discharge port side journal of the pump shaft (11). In addition, a bearing metal 19 made of a synthetic resin is fixed to the pump casing 10 by the housing cap 18 so that the outer circumferential surface of the sleeve 16 is sealed and relatively slide rotational movement is performed. The discharge port is configured to serve as a seal and shaft support without a separate packing.

The bearing metal 19 is more preferably made of a material such as tp610 metal, a new synthetic resin-based material, so that the sliding resistance is greatly reduced at a slightly elevated operating temperature due to the hydraulic pressure of the pumping operation. It is fixedly installed on the pump casing 10 by a housing cap 18 having an extension portion 18a extending toward the outer circumferential surface of the 16.

In addition, the pump casing 10 of the inlet 14 is provided with a metal bearing portion 20 for supporting the pump shaft 11, and the packing 20a for blocking leakage is provided inside the metal bearing portion 20. Although illustrated, the present invention may be configured as shown in FIG. 1 without being limited thereto, or may be configured by modifying the configuration of FIG. 4. The pump shaft 11 end of the suction port 14 and the motor shaft 22 end of the motor 21 are fastened and fixed by the clamp coupling 23.

FIG. 5 is an exploded perspective view of the clamp coupling, in which the configuration of the adapter and clamp coupling portion of FIG. 3 is shown in detail as a partial enlarged cross-sectional view, and FIG. 7 is a cross-sectional view taken along the line A-A of FIG. do. 8 shows another partial configuration of the matching means of FIG.

In the centrifugal pump of the present invention, as shown in FIGS. 3 and 5, the motor 21 is fixed to one side of the pump casing 10 via the adapter 27, and the motor shaft ( 23) and the pump shaft 11 is configured to be fixed to rotate together.

In FIGS. 3 and 5, the motor 21 is fixed to one side of the pump casing 10 through the adapter 27, and only the pump casing 10 is fastened to the upper portion of the bed 28. The motor shaft 22 and the pump shaft 11 protrude into the through space portion 27 ′ penetrated in the axial direction of the adapter 27, and are connected by the clamp coupling 23.

The adapter 27 is composed of a fixed plate portion (27a, 27b) and the connecting portion (27c), may be an integral casting structure, or may be a welding structure. The fixing plate portions 27a and 27b, the pump casing 10 and the motor 21 are formed with matching protrusions 10a and 21a and matching grooves 27d and 27e so that the central axes are matched during assembly. And a pair of clamp coupling pieces 23a separated in the axial direction through the assembly opening portion 27f, by matching the fixing plate portions 27a and 27b with each other by forming the assembly opening portion 27f. , 23b can be assembled by the coupling bolts 26.

As shown in FIG. 8, instead of forming the matching protrusions 10a and 21a and the matching grooves 27d and 27e, the matching pins 27h may be employed.

In addition, as shown in Fig. 7, it is preferable to install a safety net 27g at the connecting portion 27c in the assembly opening 27f to prevent access to the clamp coupling 23 rotating from the outside.

In the above-described embodiment is shown and described that the impeller 12 is applied to a multi-stage centrifugal pump that is connected to a plurality, but may be applied to a centrifugal pump of one stage.

By applying the sleeve 16 and the bearing metal 19 as described above, the sealing state is maintained by the structure according to the embodiment of the present invention also serves as a sealing and shaft support pump shaft 11 and the impeller 12 at the same time It is possible to support the pump casing 10 so that it does not need to be configured separately, thereby greatly reducing the installation space of the discharge port side of the pump shaft, not only reduce the manufacturing cost, but also eliminate the resistance by conventional packing This can improve performance.

In addition, according to the configuration of another embodiment of the present invention, which is centrifuged by the adapter, the pump shaft 11 and the motor shaft 22 are fixed while the motor 21 is fixed to the pump casing 10 using the adapter 27. Since the clamp coupling 23 can be fastened to the pump shaft 11 and the motor shaft 22 using bolts, it is possible to centrifuge, so that the matching operation as in the prior art is unnecessary and the assembly is performed quickly.

As described above, according to the configuration and operation of the embodiment of the present invention, the structure of the bearing metal, the sleeve, and the housing cap is applied to the centrifugal pump, thereby greatly reducing the installation space and reducing the manufacturing cost. The resistance of the packing and the bearings is eliminated to improve performance.

In addition, by using the adapter and clamp coupling to fix the motor to the pump casing and rotatably connect the motor shaft and the pump shaft together, it is convenient to center the motor and pump, as well as easy to dismantle and assemble the installation, noise is reduced, etc. Has the effect of.

Claims (3)

The pump shaft 11, in which the impeller 12 is rotated together, has a pump casing 10 rotatably installed, and is connected to the motor shaft 22 of the motor 21 on one side of the pump shaft 11. In the centrifugal pump for pumping the fluid while the impeller 12 is rotated at a high speed, The sleeve 16 having the sintered metal coating layer formed on the circumference of the discharge port side journal of the pump shaft 11 is fixedly installed, and the outer circumferential surface of the sleeve 16 is sealed and made to have a relatively sliding rotational motion. Centrifugal pump, characterized in that the bearing metal (19) is configured to serve as a seal and the shaft support by being fixed to the pump casing by the housing cap (18). The motor 21 is fastened to the pump casing 10 in a suspended state, and is connected between the pump casing 10 and the motor 21 by an adapter 27 having a through space portion 27 '. Centrifugal pump, characterized in that configured to connect the motor shaft 22 and the pump shaft (11) of the motor (21) protruding into the through space portion (27 ') of the adapter (27) by the clamp coupling (23). 3. The clamp coupling portion (23) according to claim 2, wherein the clamp coupling (23) is composed of a pair of clamp coupling pieces (23a, 23b) axially separated to be coupled by bolts (26), The adapter 27 has a central shaft that is fitted through the matching protrusions 10a and 21a and the joining grooves 27d and 27e, and is fixed to the side of the pump casing 10 and the motor 21 facing each other. 27a and 27b and an assembly opening part for assembling the coupling bolts 26 of the pair of clamp coupling pieces 23a and 23b separated in the axial direction and fixedly connecting the fixing plate portions 27a and 27b thereof ( 27f) is configured to include a connecting portion (27c), The assembly opening portion (27f) centrifugal pump, characterized in that the safety net (27g) is mounted to the connection portion (27c) to prevent access to the clamp coupling (23) that rotates from the outside.