JP2007182769A - Submerged bearing device for horizontal shaft pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a submerged bearing device for a horizontal shaft pump enabling cleaning of deposit and drainage of cleaning waste water by always dipping the submerged bearing device in water. <P>SOLUTION: Since a water storage chamber 18 is formed in a bearing casing 17 of the horizontal shaft pump, the submerged bearing device 20 is always dipped in water, and a water filling pipe 21 for flashing and a drain pipe 22 discharging deposit are connected to a bottom part of the water storage chamber 18, the submerged bearing 20 is always dipped in water stored in the water storage chamber 18 and is not damaged even if the same is operated in air. Since lubricating oil is not used for the submerged bearing 20, environmental pollution due to pumping does not occur. Then, mud and rubbish deposited in a shaft seal part of the submerged bearing 20 and the water storage chamber 18 can be cleaned and discharged, and the bearing part is not damaged. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a horizontal shaft pump that uses a ceramic bearing used for pumping and draining water such as clean water, sewage, rainwater, or industry, and more particularly to an improvement of a submersible bearing that does not require lubricating oil.

  As shown in FIG. 4, the conventional horizontal shaft mixed-flow pump has a horizontal main shaft 52 with a rear end supported by a bearing box 51 passing through a shaft sealing portion 54 on the back wall of the suction casing 53 and discharging. The impeller 56 extending to the casing 55 and disposed in the discharge casing 55 is fixed. A bearing casing 67 is connected to a plurality of guide vanes 57... Disposed in the discharge casing 55, and a metal bearing 60 provided in the bearing case 59 is inserted into a bearing sleeve 61 fitted on the main shaft 52. is there. The bearing case 59 is held by a bearing housing 62 and is supported on a stand 63 erected on the bottom of the bearing casing 67. A prime mover (not shown) is connected to the shaft coupling 64 at the rear end of the main shaft 52, and the impeller 56 is rotated to suck up water from a suction port 53a of the suction casing 53 to pump water. The water is discharged from the discharge port 55a of the discharge casing 55. A grease pipe 65 is connected to a metal bearing 60 provided in the bearing case 59, and a lubricating oil pump 66 interlocked with the main shaft 52 is operated during driving so that lubricating oil is circulated and supplied to the metal bearing 60. It is. In addition, as a device for water lubrication using a ceramic bearing with good lubricity for the underwater bearing, a water storage chamber standing in the vicinity of the submersible bearing is formed in the bearing casing, and a ring suspended on the main shaft is rotated to store the water storage chamber A horizontal axis pump for dropping the water into an underwater bearing is known, for example, as described in Patent Document 1.

Japanese Utility Model Publication No. 5-32793 (Claim 1, FIG. 1)

  Since a horizontal shaft pump that supplies a lubricant to a metal bearing during conventional driving circulates and press-fits the lubricant into the metal bearing, the lubricant may leak to the outside from the connection portion of the metal bearing or grease pipe. There is concern about the contamination of the environment by mixing lubricating oil in the pumped water, and it has been avoided in the fields of water purification and food. To solve this problem, a horizontal shaft pump that uses a ceramic bearing as the underwater bearing and pumps the water in the water storage chamber on the sliding surface with a ring does not pollute the environment. Although water lubrication can be performed, since the amount of water supplied is small when water is supplied by the ring, dry operation cannot be performed in a short period of time at the start-up at the time of falling water or starting operation. In the case of a horizontal axis pump, since a load is always applied to the bearing, there is a risk of damage to the rubber bearing due to sticking of the rubber bearing or local heat generation even in a short time operation (up to 30 seconds). The mud and dust that flowed into the water storage chamber cannot be discharged, and there is a risk of damage due to clogging of the bearing. The present invention provides a horizontal axis pump that forms a water storage chamber in which a submerged bearing is always completely submerged in a bearing casing, eliminates the need for external water injection during operation, and enables the water storage chamber to be washed and sediment to be discharged. .

  An underwater bearing device for a horizontal shaft pump according to the present invention is a horizontal shaft pump in which an impeller is fixed to a main shaft extending to a discharge casing, and a tip end portion of the main shaft is supported by an underwater bearing. The underwater bearing is always submerged, and even when the horizontal shaft pump starts to fall down or in the air during the management operation, the underwater bearing is always immersed in water and lubricated, so that it is not damaged. By allowing water to penetrate into the bearing portion of the submersible bearing, it is possible to smoothly slide the main shaft. No lubricating oil is used for underwater bearings, so the environment due to pumping will not be polluted.

  A water seal plate is inserted into the bearing casing, and a partition wall is erected from the bottom of the bearing casing, and a water storage chamber is formed by covering the seal plate and the top of the partition wall with a seal cover. In addition, a water supply port and an opening are provided in the sealing cover above the sealing plate, and water is stored in the water storage chamber so that no external water injection is required. If the flushing water injection pipe and the drain pipe for discharging sediment are connected to the bottom of the water storage chamber, the water storage chamber in which the underwater bearings are immersed can be washed and the inflow mud and dust can be discharged. There is no damage to the underwater bearing.

  The submersible bearing device of the horizontal axis pump according to the present invention is configured such that when the horizontal axis pump installed on land is vacuum-sucked and water is pumped into the suction casing by negative pressure, the water is received from the water supply port above the sealing plate. It overflows into the casing and flows into the water storage chamber through the opening of the sealing cover. An underwater bearing that pivotally supports the main shaft can be immersed in the water stored in the water storage chamber. The submerged bearing can be lubricated with the water stored in the water storage chamber even when the water level drops and the engine is idling. Because no lubricating oil is used for the submerged bearing, the environment due to pumping will not be polluted. If water is injected from the water injection pipe into the water storage chamber as necessary, the water storage tank and the underwater bearing can be cleaned, and the cleaning wastewater mixed with sediment and fine particles can be discharged from the drain pipe. Without disassembling the components of the horizontal shaft pump, flushing of the water storage chamber in which the underwater bearing is immersed is performed, and the maintenance cost is also reduced.

  A submerged bearing device for a horizontal shaft pump according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a horizontal shaft mixed-flow pump, in which a water storage chamber 18 is placed inside a bearing casing 17 supported by guide vanes 7. The underwater bearing 20 that pivotally supports the tip end portion of the main shaft 2 is disposed on a gantry 19 erected on the bottom of the water storage chamber 18. A flushing water injection pipe 21 that discharges along the guide vanes 7 and communicates with the outside of the casing 5 and a drain pipe 22 that discharges deposits are disposed. One end of the water injection pipe 21 and the drain pipe 22 is connected to the water storage chamber 18. Connected to the bottom. If necessary, if water is injected from the water injection pipe 21 into the water storage chamber 18, the mud and dust accumulated in the sliding portion of the submerged bearing 20 and the water storage chamber 18 are flowed and cleaned, and the cleaning wastewater is discharged from the drain pipe 22. it can. The water storage chamber 18 is flushed without disassembling the components of the horizontal shaft mixed-flow pump, so that the submersible bearing is not damaged by clogging of deposits, and the maintenance cost is reduced. In the horizontal axis mixed flow pump of the present invention shown in FIG. 1, the components common to the conventional horizontal axis mixed flow pump in FIG.

  FIG. 2 is a longitudinal sectional view of the main part of the bearing casing. In the embodiment of the present invention, the underwater bearing 20 pivotally supporting the tip end portion of the main shaft 2 has a ceramic bearing 24 provided in the bearing case 23. It is slidably inserted through a bearing sleeve 25 fitted on the outer surface of the bearing sleeve. A bearing case 23 provided with a ceramic bearing 24 is held by a bearing housing 26 and is supported on a pedestal 19 erected on the bottom of the bearing casing 17. The ceramic bearing 24 provided in the bearing case 23 may be a rubber bearing. As shown in FIG. 2, the structure of the water storage chamber 18 is such that a sealing plate 28 is fixed to the opening of the bearing casing 17 on the impeller 6 side, and the main shaft 2 is inserted into the sealing plate 28 to store the water storage chamber. The shaft is sealed with a shaft seal device 29. A gap is provided between the upper end of the bearing casing 17 on the impeller 6 side and the sealing plate 28, and a water supply port 30 is provided to allow the pumped water to overflow into the bearing casing 17. A partition wall 31 is erected in the vicinity of the tip end portion of the main shaft 2 from the lower middle portion of the bearing casing 17, and a sealing cover 32 is covered on the sealing plate 28 and the upper end portions of the partition wall 31 to form the underwater bearing 20. A water storage chamber 18 is formed.

  FIG. 3 is a cross-sectional view of the main part of the bearing casing. An opening 32a is provided in the upper part of the sealing cover 32, and water overflowing from the water supply port 30 above the sealing plate 28 to the bearing casing 17 is sealed. It flows from the opening 32a of the water cover 32. The underwater bearing 20 that supports the main shaft 2 is immersed in the water stored in the water storage chamber 18, and the ceramic bearing 24 is wetted with water. The water stored in the water storage chamber 18 becomes a submerged water level HL where the underwater bearing 20 is submerged, and the underwater bearing 20 of the horizontal shaft diagonal flow pump can be lubricated even when the water is dropped at the time of start-up or when the management operation is dry. The lubrication device of the underwater bearing 20 can be made non-lubricated with a simple structure, and the lubricating oil is not mixed into the pumped water and the environment is not polluted.

  The submerged bearing device for a horizontal shaft pump according to the present invention forms a water storage chamber in which the submersible bearing is always completely submerged in the bearing casing, so that external water injection during operation is unnecessary, and the water storage chamber is cleaned and sediment is discharged. The submersible bearings are always lubricated even when water is dropped at the start of the horizontal axis pump or in the aerial operation of the management operation, so there is no damage and no lubricating oil is used. There is nothing to do. And since the flushing of the water storage chamber in which the underwater bearing is immersed can be performed, it is not necessary to disassemble the components of the horizontal shaft pump, and the maintenance cost is also reduced. Therefore, the environmental load is reduced and safety is improved, and the horizontal shaft pump can be used for water purification plants and food-related products.

It is a longitudinal cross-sectional view of the horizontal-shaft mixed flow pump which arrange | positioned the underwater bearing apparatus which concerns on this invention. Similarly, it is a principal part longitudinal cross-sectional view of the bearing casing of a horizontal shaft mixed-flow pump. Similarly, it is a principal part cross-sectional view of the bearing casing of a horizontal-shaft mixed flow pump. It is a longitudinal cross-sectional view of a horizontal shaft mixed-flow pump using a conventional metal bearing.

Explanation of symbols

2 Main shaft 5 Discharge casing 6 Impeller 17 Bearing casing 18 Reservoir chamber 20 Submersible bearing 21 Water injection pipe 22 Drain pipe 24 Ceramic bearing 28 Sealing plate 30 Water supply port 31 Partition wall 32 Sealing cover 32a Opening

Claims (3)

  In a horizontal shaft pump in which an impeller (6) is fixed to a main shaft (2) extending to a discharge casing (5) and a tip end portion of the main shaft (2) is supported on an underwater bearing (20), a bearing casing ( 17) A water storage chamber (18) is formed in 17), and the submerged bearing (20) is always submerged.   A sealing plate (28) for inserting the main shaft (2) is fixed to the bearing casing (17), a partition wall (31) is erected from the bottom of the bearing casing (17), and the sealing plate (28) And the upper part of the partition wall (31) is covered with a sealing water cover (32) to form a water storage chamber (18), and a water supply port (30) and a sealing water cover (32) above the sealing water plate (28). An opening (32a) is provided in the water storage chamber (18) so that external water injection is unnecessary, and the submersible bearing device for a horizontal shaft pump according to claim 1,   The submerged bearing device for a horizontal shaft pump according to claim 1 or 2, wherein a flushing pipe (21) and a drain pipe (22) for discharging deposits are connected to the bottom of the water storage chamber (18). .

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