JP6456215B2 - Vertical shaft submersible pump - Google Patents

Description

  The present invention relates to a vertical shaft submersible pump including a bearing, a vertical shaft supported by the bearing and rotating, and an impeller attached to the vertical shaft.

  In a vertical shaft submersible pump, a lubricant such as grease is usually used for a bearing that supports the vertical shaft. When the lubricant liquefied with the operation of the pump falls down from the bearing, the lubricant reaches a part such as a mechanical seal or an impeller through a vertical shaft, which may impair the function of the part. For these problems, for example, it is conceivable to use an oil seal to prevent the lubricant from entering the mechanical seal or impeller.

  As another means, Japanese Patent Application Laid-Open No. 2009-299562 (Patent Document 1) discloses a screw seal in which a reverse screw is cut in a direction in which a leaked lubricant is returned to the bearing side by rotation of the pump main shaft. The structure provided in the surrounding surface of a pump main axis | shaft is disclosed.

  However, in the configuration using the oil seal, there is a problem that the pump efficiency is lowered due to friction between the oil seal and the casing. Further, the means of Patent Document 1 has a problem of increasing costs, such as the need for reverse screw machining.

JP 2009-299562 A

  It is desired to realize a bearing structure for a pump that has a simple configuration and suppresses intrusion of lubricant that has been properly lowered from the bearing into other parts.

The vertical shaft submersible pump according to the present invention is
A bearing,
A vertical shaft supported and rotated by the bearing;
A vertical shaft submersible pump comprising an impeller attached to the vertical shaft,
A part of the peripheral surface of the vertical shaft between the bearing and the impeller is formed with a retention portion that receives and retains the lubricant that connects the vertical shaft from the bearing ,
The receiving space has a receiving space for receiving the lubricant scattered from the stay portion as the vertical shaft rotates, and the receiving space also serves as a receiving space for receiving a cable connected to a drive source .

According to this configuration, even if the lubricant that falls down from the bearing has a vertical axis, the lubricant can be received and retained by the retaining portion before the lubricant reaches the impeller. In addition, if the allowable amount is exceeded even if it stays in the staying part, the lubricant may drop from the staying part toward the impeller, but since the vertical axis is rotated by the drive source, The staying lubricant is scattered outward by centrifugal force due to rotation before dropping downward. In this way, by providing a staying part on a part of the peripheral surface of the vertical shaft, the dripping lubricant stays temporarily without dripping as it is, and the lubricant staying in the staying part is moved outward by centrifugal force due to rotation. Therefore, it is possible to effectively prevent the lubricant from reaching the impeller through the vertical axis. Therefore, with a simple configuration in which only the staying portion is provided, it is possible to effectively suppress intrusion of the lubricant properly applied from the bearing into other parts. And since the lubricant scattered from the staying part is received in the receiving space, it is possible to effectively suppress the scattered lubricant from scattering to the surroundings and unexpectedly reaching the impeller (mechanical seal). Since the receiving space and the receiving space for the cable connected to the drive source are combined, there is no need to newly provide a receiving space, and the space necessary for providing the receiving space in the vertical shaft submersible pump can be omitted. . Furthermore, when the receiving space is configured in a part of the bearing box, if the receiving space is also used as the accommodating space, further space saving can be achieved.

  Hereinafter, the suitable aspect of the vertical-axis submersible pump which concerns on this invention is demonstrated. However, the scope of the present invention is not limited by the preferred embodiments described below.

  As one aspect, a mechanical seal disposed between the impeller and the bearing is provided, and the staying portion is formed on a part of the peripheral surface of the vertical shaft between the bearing and the mechanical seal. It is preferable that

  When a mechanical seal is provided between the impeller and the bearing to prevent water from leaking from the impeller side to the bearing side, if the lubricant enters the mechanical seal due to dripping of the lubricant from the bearing, the mechanical seal There is a risk of hindering the function. And according to this structure, even when a mechanical seal is used for a pump, it can suppress effectively that a lubricant reaches a mechanical seal by a stay part.

  As one aspect, it is preferable that the staying portion is a groove formed over one circumference of the peripheral surface of the vertical shaft.

  According to this structure, a retention part can be comprised with the simple structure of a groove | channel. In addition, since it is formed over the entire circumference of the vertical axis, lubricant can be retained in the groove over the entire circumference of the vertical axis, and the retained lubricant can be scattered outward by centrifugal force due to rotation. Therefore, it can suppress more effectively that a lubricant reaches an impeller (mechanical seal).

  As one aspect, it is preferable that a bearing box for housing the bearing is provided, and the receiving space is formed in the bearing box.

  According to this configuration, since the receiving space is formed in the bearing box that is normally used to accommodate the bearing in the vertical shaft submersible pump, the space necessary for separately providing the receiving space in the vertical shaft submersible pump can be omitted. it can.

Overall illustration of vertical shaft submersible pump Enlarged view of bearing housing

  An embodiment of a vertical shaft submersible pump according to the present invention will be described with reference to the drawings. The vertical shaft submersible pump 1 according to this embodiment includes a bearing 21, a vertical shaft 40 that is supported by the bearing 21 and rotates, and an impeller 31 attached to the vertical shaft 40. A retaining portion 42 that receives and retains the lubricant G connecting the vertical shaft 40 from the bearing 21 is formed in a part of the peripheral surface 41 of the vertical shaft 40 between the bearing 21 and the impeller 31. Thereby, with the simple structure which provides only the retention part 42, the penetration | invasion to the other members (the impeller 31 and the mechanical seal 22) of the lubricant G appropriately fallen from the bearing 21 can be suppressed effectively. Hereinafter, the vertical shaft submersible pump 1 according to the present embodiment will be described in detail.

  As shown in FIG. 1, the vertical shaft submersible pump 1 according to the present embodiment includes, in order from the top, a motor frame 10 that houses a motor 11, a bearing box 20 that includes a bearing 21, and a pump casing that houses an impeller 31. 30.

  The vertical shaft submersible pump 1 has a vertical shaft 40 having one end attached to the motor 11 and the other end attached to the impeller 31. That is, the impeller 31 is rotationally driven by rotating the vertical shaft 40 by the motor 11. The vertical shaft 40 is supported by the bearing 21.

  In order to prevent leakage of water from the impeller 31 side to the bearing 21 side, a mechanical seal 22 is disposed between the impeller 31 and the bearing 21 in the bearing box 20.

  That is, the vertical shaft submersible pump 1 has an outer surface composed of the motor frame 10, the bearing box 20, and the pump casing 30, and the inside rotates the bearing 21, the vertical shaft 40 supported by the bearing 21, and the vertical shaft 40. The motor 11, the impeller 31 attached to the vertical shaft 40, and the mechanical seal 22 disposed between the impeller 31 and the bearing 21 are configured.

  Moreover, the pump casing 30 includes a suction port 32 that is formed to protrude in the axial direction at the center of the lower end, and a discharge port 33 that opens in the radial direction. The suction port 32 is in a state of communicating with the suction port 31 a of the impeller 31. The discharge port 33 is connected to piping or the like (not shown). For this reason, when the impeller 31 is driven to rotate by driving the motor 11, the surrounding water is sucked from the suction port 32, and a flow of water toward the discharge port 33 is generated in the pump casing 30, and is connected to the discharge port 33. Water is discharged to the target location through the piping.

  Thus, in the operation of the vertical shaft submersible pump 1, the vertical shaft 40 supported by the bearing 21 is rotated by the drive of the motor 11, and the impeller 31 is rotated accordingly. Then, the water sucked from the suction port 32 is discharged to a target place through a pipe connected to the discharge port 33 while preventing the water leaking from the impeller 31 side to the bearing 21 side by the mechanical seal 22. The

  During the operation of the vertical shaft submersible pump 1, a lubricant G such as grease is supplied to the bearing 21 in order to smoothly rotate the vertical shaft 40. However, the lubricant G may drop from the bearing 21 due to the high temperature of the bearing 21 as the vertical shaft 40 rotates, and may reach the mechanical seal 22 and the impeller 31 through the vertical shaft 40. When the lubricant G of the bearing 21 enters the mechanical seal 22, the mechanical seal 22 can no longer function as a seal. If the operation of the pump 1 is continued in such a state, water sucked up by the impeller 31 is absorbed by the bearing 21. Or the motor 11 may be reached, leading to damage to the pump 1 as a whole.

  In order to solve this problem, the vertical shaft submersible pump 1 according to the present embodiment employs the following configuration. First, as shown in FIGS. 1 and 2, the vertical shaft 40 extends from the bearing 21 to a part of the peripheral surface 41 of the vertical shaft 40 between the bearing 21 and the mechanical seal 22 (that is, between the bearing 21 and the impeller 31). A single groove 42 is formed as a retaining portion for receiving and retaining the lubricant G. The groove 42 has a shape in which the circumferential surface 41 is cut out in an arc shape from the horizontal direction, and is formed over the circumference of the circumferential surface 41 of the vertical shaft 40.

  As a result, even if the lubricant G that falls down from the bearing 21 reaches the vertical shaft 40, the groove 42 receives and retains the lubricant G before the lubricant G reaches the mechanical seal 22 and the impeller 31. Further, it is conceivable that the lubricant G drops from the groove 42 toward the mechanical seal 22 and the impeller 31 when the allowable amount is exceeded even if the lubricant G stays in the groove 42. However, the lubricant G may drop when the vertical shaft submersible pump 1 is operated, that is, when the motor 11 is driven. Since the vertical shaft 40 is rotated by the motor 11, The retained lubricant G scatters outward by centrifugal force due to rotation before dropping downward. That is, by providing the groove 42 in a part of the peripheral surface 41 of the upright shaft 40, the dripping lubricant G stays, and the staying lubricant G is scattered outward by centrifugal force due to rotation, and the upright shaft 40 is connected. It is possible to suppress the lubricant G from reaching the mechanical seal 22 and the impeller 31.

  As shown in FIG. 2, the bearing box 20 is provided with a receiving space 23 for receiving the lubricant G scattered from the groove 42 as the vertical shaft 40 rotates. The receiving space 23 uses the internal space of the bearing box 20 and contributes to space saving. The receiving space 23 has an opening 23a that opens toward the groove 42 at a height position corresponding to the height position of the groove 42, and the lubricant G scattered outward from the groove 42 is efficiently opened. It passes through 23a and is received in the receiving space 23. The receiving space 23 is covered with a plug 24. By removing the plug 24, the lubricant G accumulated in the receiving space 23 can be recovered.

  The receiving space 23 also serves as an accommodating space 25 that accommodates the cable 12 connected to the motor 11. That is, in order to drive the motor 11, various cables (a motor cable, a power cable, a control cable, etc.) are required, and a space for accommodating these is required. And in the vertical shaft submersible pump 1 which concerns on this embodiment, the space 25 which accommodates the cable 12 serves as the receiving space 23, and the space saving is aimed at.

  That is, when the vertical shaft submersible pump 1 starts operation, the lubricant G is first received in the groove 42 and stays even if the lubricant G falls down from the bearing 21 and reaches the vertical shaft 40. Thereafter, the lubricant G staying in the groove 42 is scattered outward by centrifugal force due to rotation before dropping downward, and the lubricant G passes through the vertical shaft 40 to the mechanical seal 22 and the impeller 31. Can be suppressed. The lubricant G scattered outward is received in the receiving space 23 and stored. As described above, since the vertical shaft 40 has the groove 42, the lubricant G that falls down from the bearing 21 of the bearing box 20 does not reach the mechanical seal 22 and the impeller 31, and the receiving space 23 of the bearing box 20. The lubricant G can be recovered in the bearing box 20 without leaking to other parts.

[Other Embodiments]
Finally, other embodiments of the vertical shaft submersible pump according to the present invention will be described. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises.

(1) In the above embodiment, the receiving space 23 for receiving the lubricant G scattered from the groove 42 is formed in the bearing box 20, and the receiving space 23 in the bearing box 20 is also used as the receiving space 25 for the cable 12. Was described as an example. However, the embodiment of the present invention is not limited to this. For example, the receiving space 23 may be provided in the bearing box 20 separately from the housing space 25, or the receiving space 23 may be provided outside the bearing box 20.

(2) In the above embodiment, the configuration in which the single groove 42 is formed over the circumference of the peripheral surface 41 of the upright shaft 40 has been described as an example. However, the embodiment of the present invention is not limited to this. For example, the groove 42 may not be formed over the entire circumference of the peripheral surface, and a plurality of grooves may be formed. Moreover, although the groove | channel 42 was made into the shape which notched the surrounding surface 41 on the circular arc in the horizontal direction, it is good also as a shape notched on the rectangle. In addition, for example, the peripheral surface 41 may be cut obliquely downward to form a bowl-shaped groove. In this case, the lubricant stays in the groove more preferably.

(3) In the above-described embodiment, the configuration in which the groove 42 is adopted as the staying portion that receives and retains the lubricant G has been described as an example. However, the embodiment of the present invention is not limited to this. The configuration is not limited to the shape of the groove, and any configuration may be used as long as the lubricant G is received and retained.

(4) Regarding other configurations, it should be understood that the embodiments disclosed herein are illustrative in all respects and that the scope of the present invention is not limited thereby. Those skilled in the art will readily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Accordingly, other embodiments modified without departing from the spirit of the present invention are naturally included in the scope of the present invention.

  The present invention can be used for, for example, a vertical shaft pump used in water.

DESCRIPTION OF SYMBOLS 1 Vertical shaft submersible pump 12 Cable 20 Bearing box 21 Bearing 22 Mechanical seal 23 Reception space 25 Accommodating space 31 Impeller 40 Vertical shaft 41 Circumferential surface 42 Groove (Retention part)
G Lubricant

Claims (4)

A bearing,
A vertical shaft supported and rotated by the bearing;
A vertical shaft submersible pump comprising an impeller attached to the vertical shaft,
A part of the peripheral surface of the vertical shaft between the bearing and the impeller is formed with a retention portion that receives and retains the lubricant that connects the vertical shaft from the bearing ,
A vertical shaft submersible pump having a receiving space for receiving the lubricant scattered from the stay portion as the vertical shaft rotates, and the receiving space also serving as a housing space for housing a cable connected to a drive source . Comprising a mechanical seal disposed between the impeller and the bearing;
The vertical shaft submersible pump according to claim 1, wherein the staying portion is formed on a part of a peripheral surface of the vertical shaft between the bearing and the mechanical seal.   The vertical shaft submersible pump according to claim 1 or 2, wherein the staying portion is a groove formed over a circumference of the peripheral surface of the vertical shaft. A bearing box for housing the bearing;
The vertical shaft submersible pump according to any one of claims 1 to 3, wherein the receiving space is formed in the bearing housing.

Images