JP2007263124A - Pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump capable of eliminating the need of a lubricating oil for cooling a bearing and enabling a reduction in the size of a facility. <P>SOLUTION: A discharge casing 30 and an impeller casing 20 are connected to the upper and lower sides of a lifting pipe 10, respectively. A shaft 11 rotatingly driving an impeller 21 installed in the impeller casing 20 is pulled from the upper side surface of the discharge casing 30 through the lifting pipe 10 to form the pump. An underwater thrust bearing 41-3 and an underwater radial bearing 43-3 for pivotally supporting the shaft 11 are installed in a bowl 40-3 at the upper portion of the impeller 21. Besides the underwater radial bearing 43-3, an underwater radial bearing 49-2 for the shaft 11 is installed at the lower part of the impeller 21. A seal mechanism 47-3 is formed in the portion of the shaft 11 extending through the discharge casing 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pump that can effectively cool a bearing of a shaft that rotationally drives an impeller and can be made compact.

  Conventionally, there is a pump having a structure shown in FIG. 4 as a pump for pumping water and discharging it to a predetermined place. The pump shown in the figure has an impeller casing 61 that houses an impeller 67 under a pumping pipe 60, and a discharge casing 65 that is bent 90 ° at the top of the pumping pipe 60 and is installed inside the pumping pipe 60. The shaft 66 is projected from the upper portion of the discharge casing 65 and connected to a speed reducer (not shown) and a driving machine such as a diesel engine or a gas turbine.

  The upper portion of the shaft 66 is pivotally supported by thrust / radial bearings s and r1, and the lower portion thereof is pivotally supported by a radial bearing r2. The upper thrust / radial bearings s, r1 are installed in an upper bearing unit 68 provided at the upper portion of the discharge casing 65, while the radial bearing r2 is supported by a bowl 69 covering the upper bearing unit 68, and the bowl 69 is supported by guide vanes 64. ing.

  And if a drive machine is driven and the shaft 66 and the impeller 67 rotate, the water in the water absorption tank 70 will be pumped by the discharge casing 65 via the pumping pipe 60, and will be drained to the predetermined place.

  Since the bearings s, r1 and r2 have a large pumping facility (and may be a small pumping facility in some cases), it is necessary to cool the bearing, so the lower radial bearing r2 is cooled by the water flowing in the pumping pipe 60. The upper thrust / radial bearings s and r1 are cooled by supplying lubricating oil into the upper bearing unit 68 separately. The lubricating oil that has reached a high temperature is cooled using an oil cooler 80.

However, in the above conventional pump, the thrust bearing s and the radial bearing r1 are housed in the upper bearing unit 68. In particular, since the thrust bearing s has a large load and a high temperature, lubricating oil for cooling the thrust bearing s is used. As a result, the amount of the oil cooler 80 becomes large, and the size of the upper bearing unit 68 itself increases, which has hindered downsizing of the pump equipment.
Japanese Utility Model Publication No. 4-65996 Japanese Utility Model Publication No. 61-105793

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a pump that can reduce or eliminate the amount of lubricating oil for cooling the bearing and can reduce the size of the equipment.

According to the first aspect of the present invention, the discharge casing and the impeller casing are connected to the upper and lower sides of the pumping pipe, respectively, and the shaft for rotationally driving the impeller installed in the impeller casing is connected to the discharge casing through the pumping pipe. In the pump connected to the drawer drive machine from the upper side,
An underwater thrust bearing that supports the shaft and an underwater radial bearing are installed in a bowl in the upper part of the impeller, and an underwater radial bearing of the shaft is installed in the lower part of the impeller separately from the underwater radial bearing. It is in the pump characterized by the above. Of course, the present invention can also be applied to a horizontal pump.

  The invention according to claim 2 of the present application is the pump according to claim 1, wherein a seal mechanism is provided in a portion of the shaft passing through the discharge casing.

  The invention according to claim 3 of the present application is characterized in that a cylindrical portion extending in a cylindrical shape to the upper portion of the bowl and reaching the upper portion of the discharge casing is provided, and liquid is supplied into the bowl. In the pump.

  In the invention described in claim 4 of the present application, the liquid supplied into the bowl is a circulating liquid for circulating the liquid filled in the bowl, or is a supply liquid supplied into the bowl from the outside of the bowl. It exists in the pump of Claim 3 characterized by these.

  The invention according to claim 5 of the present application is the pump according to claim 3 or 4, wherein a dust seal for sealing between the shaft and the bowl is provided below the underwater thrust bearing and the underwater radial bearing.

  According to the first aspect of the present invention, since the bearings in the bowl are composed of the submersible thrust bearing and the submersible radial bearing, it is necessary to provide the bearings in the bowl so that the bearings are not submerged when these are oil lubricated bearings. Therefore, the sealing mechanism having the above can be eliminated. Further, the submersible thrust bearing can be lubricated by pumping water, and the lubricating oil for submersible thrust bearing lubrication can be dispensed with. Since another underwater radial bearing is installed at the lower part of the impeller, it is not necessary to lubricate the underwater radial bearing with lubricating oil.

  According to the second aspect of the present invention, since the seal mechanism is installed on the upper part of the discharge casing, the maintenance is easier than the case where the seal mechanism is provided inside the bowl.

  According to invention of Claim 3, Claim 4, and Claim 5, it can prevent that the underwater thrust bearing and underwater radial bearing in a bowl are damaged by the slurry in pumping water.

Hereinafter, reference examples and embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic sectional view showing an example of a pump using one reference example of the present invention. As shown in the figure, the pump has an impeller casing 20 that houses an impeller 21 under the pumping pipe 10, and a discharge casing 30 that is bent 90 ° on the pumping pipe 10. The upper part of the shaft 11 installed upright is penetrated and protruded from the curved upper side surface of the discharge casing 30 and is connected to a driving machine such as a diesel engine or a gas turbine (not shown) via a reduction gear (not shown). Has been.

  Here, the upper part of the impeller 21 of the shaft 11 is substantially cylindrical and is covered with a bowl 40 for smoothing the flow of water, and a thrust bearing 41 and a radial bearing 43 attached to the inside of the bowl 40. The shaft 11 is pivotally supported. The bowl 40 itself is fixed to the inner periphery of the pumping pipe 10 by guide vanes 45. Further, the bowl 40 is provided with a sealing mechanism 47 so that outside water does not enter the bowl 40. The upper part of the bowl 40 extends in a cylindrical shape and protrudes from the upper side surface of the discharge casing 30, and another radial bearing 49 installed on the upper part supports the shaft 11. The upper radial bearing 49 is installed in the upper bearing unit 50, and lubricating oil for cooling the upper bearing unit 50 is supplied and circulated from the oil cooler 85.

  And if the shaft 11 is rotationally driven via a speed reducer (not shown) by driving a drive machine (not shown), the water in the water absorption tank 90 is transferred to the discharge casing 30 via the impeller casing 20 and the pumping pipe 10 by the impeller 21. The water is pumped and drained to a predetermined place.

  Since the water pumped at this time cools the thrust bearing 41, the radial bearing 43 and the lubricating oil through the outer surface of the bowl 40, it is not necessary to cool the lubricating oil of these bearings 41 and 43 separately by an oil cooler or the like. It is. On the other hand, the lubricating oil for the upper radial bearing 49 needs to be cooled by the oil cooler 85, but it is sufficient to cool only the radial bearing 49, not the thrust bearing that generates a large amount of heat. The oil cooler 85 can be downsized. Further, since there is no thrust bearing, the size of the upper bearing unit 50 itself can be reduced, and the pump equipment as a whole can be made compact.

  FIG. 2 is a schematic sectional view showing an example of a pump using another reference example of the present invention. In this reference example, the same or corresponding parts as those in the reference example shown in FIG. That is, in this pump, the upper part of the impeller 21 of the shaft 11 is covered with a substantially cylindrical bowl 40, and a thrust bearing 41 and a radial bearing 43 are installed inside the bowl 40 to support the shaft 11. Although it is the same as the said reference example, in this reference example, the lower end of the shaft 11 is pivotally supported by the radial bearing 49-2. This radial bearing 49-2 is an underwater radial bearing that can be used as it is in water without using lubricating oil. Instead, the upper bearing unit 50 shown in FIG. 1 is omitted.

  If comprised in this way, the water itself pumped up will cool the thrust bearing 41, the radial bearing 43, and these lubricating oil via the outer surface of the bowl 40 similarly to FIG. However, it is not necessary to separately provide a means for cooling the lubricating oil, but it is not necessary to cool the other radial bearing 49-2 with the lubricating oil. Furthermore, the upper bearing unit 50 itself shown in FIG. 1 is not necessary, and the pump equipment as a whole can be made more compact than the reference example of FIG.

  FIG. 3 is a schematic sectional view showing an example of a pump using one embodiment of the present invention. In this embodiment, the same or corresponding parts as those in the reference example shown in FIG. In the reference example shown in FIG. 2, the thrust bearing 41 and the radial bearing 43 housed in the bowl 40 are both oil-lubricated, and therefore a seal mechanism 47 is required so as not to be submerged (this point is shown in FIG. 1). In this embodiment, the bearing in the bowl 40-3 is composed of an underwater type underwater thrust bearing 41-3 and an underwater radial bearing 43-3. A seal mechanism 47-3 is provided in a portion that penetrates the discharge casing 30. With this configuration, the sealing mechanism 47-3 can be installed on the upper portion of the discharge casing 30, and the maintenance of the sealing mechanism 47 is less than when the sealing mechanism 47 is provided inside the bowl 40 as in the reference example shown in FIG. easy.

  In the case of the embodiment shown in FIG. 3, the water to be pumped enters the portions of the submersible thrust bearing 41-3 and the submersible radial bearing 43-3, but the slurry in the pumped water may damage both bearings. . In order to avoid this, the pump may be configured as in the following embodiment.

  That is, FIG. 5 is a schematic cross-sectional view showing an example of a pump using another embodiment of the present invention. In this embodiment, the same or corresponding parts as those in the embodiment shown in FIG. In this embodiment, the difference from the embodiment shown in FIG. 3 is that the lower part of the submersible radial bearing 43-3 prevents the pumped water from entering the submersible thrust bearing 41-3 and the submersible radial bearing 43-3. Is provided with a dust seal 55 for sealing between the shaft 11 and the bowl 40-3, and a cylindrical portion 56 extending in a cylindrical shape and reaching the upper portion of the discharge casing 30 is provided at the upper portion of the bowl 40-3. The drain pipe 57 drawn out from the gap between the underwater radial bearing 43-3 and the dust seal 55 is connected to the lower part of the seal mechanism 47-3 through the pump P, and the bowl 40- 3 is configured to circulate a circulating liquid (for example, fresh water) filled in the inside. By comprising in this way, the failure | damage by the slurry of the part of the underwater thrust bearing 41-3 and the underwater radial bearing 43-3 can be prevented reliably. In this case, it is more effective to provide a filter or strainer 59 upstream or downstream of the pump P. In some cases, it is possible to prevent the bearing from being damaged only by providing the dust seal 55 and the cylindrical portion 56 without attaching the drain pipe 57 and the pump P.

  In this embodiment, the liquid in the bowl 40-3 is circulated. Instead, as shown in FIG. 6, the seal of the dust seal 55 is loosened, and the supply liquid (for example, the pump P) Fresh water) is supplied to the lower part of the seal mechanism 47-3 (the pump P is not necessarily required), and the supplied liquid is discharged from the dust seal 55 into the pumped water or discharged from the drain pipe 58 to the outside of the system. You may comprise.

  In the above reference example and embodiment, one of the two radial bearings and the thrust bearing are installed in the bowl. As another reference example, one of the two radial bearings is as shown in FIG. It is also conceivable that the other radial bearing is installed at the lower part of the impeller 21 as shown in FIG. 2 and only the thrust bearing is installed in the bowl.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are achieved.

It is a schematic sectional drawing which shows an example of the pump using one reference example of this invention. It is a schematic sectional drawing which shows an example of the pump using the other reference example of this invention. It is a schematic sectional drawing which shows an example of the pump using one Embodiment of this invention. It is a schematic sectional drawing which shows an example of the conventional pump. It is a schematic sectional drawing which shows an example of the pump using other embodiment of this invention. It is a schematic sectional drawing which shows an example of the pump using other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pumping pipe 11 Shaft 20 Impeller casing 21 Impeller 30 Discharge casing 40 Bowl 41 Thrust bearing 43 Radial bearing 45 Guide vane 47 Sealing mechanism 49 Radial bearing 50 Upper bearing unit 85 Oil cooler 90 Water absorption tank 49-2 Radial bearing 41-3 Underwater thrust bearing 43-3 Underwater radial bearing 47-3 Seal mechanism 55 Dust seal 56 Cylindrical portion

Claims (5)

The discharge casing and the impeller casing are connected to the upper and lower sides of the pumping pipe, respectively, and the shaft for rotationally driving the impeller installed in the impeller casing is connected to the drawer drive machine from the upper side surface of the discharge casing through the pumping pipe. In the pump
An underwater thrust bearing that supports the shaft and an underwater radial bearing are installed in a bowl in the upper part of the impeller, and an underwater radial bearing of the shaft is installed in the lower part of the impeller separately from the underwater radial bearing. A pump characterized by that.   The pump according to claim 1, wherein a seal mechanism is provided in a portion of the shaft passing through the discharge casing.   The pump according to claim 2, wherein a cylindrical portion extending in a cylindrical shape at an upper portion of the bowl and reaching an upper portion of the discharge casing is provided, and liquid is supplied into the bowl.   The liquid supplied into the bowl is a circulating liquid that circulates the liquid filled in the bowl, or a supply liquid supplied into the bowl from the outside of the bowl. pump.   The pump according to claim 3 or 4, wherein a dust seal for sealing between the shaft and the bowl is provided below the underwater thrust bearing and the underwater radial bearing.

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