JP6721345B2 - Pump device - Google Patents

Description

The present invention relates to a pump device.

In a vertical pump device, for example, a submersible pump device installed in a deep well or the like, an impeller is attached to a vertically extending main shaft. The main shaft and the impeller are housed in a substantially cylindrical casing, and the inner side of the peripheral wall of the casing serves as a flow path when the fluid pressurized by the rotation of the impeller is sent upward. At this time, a liner ring that seals the gap between the impeller and the casing is provided so that the fluid that is pressurized and exits the impeller does not leak to the inlet side of the impeller, which has a lower pressure. The liner ring is, for example, a ring-shaped member formed by coating a core material with an elastic body, and the elastic body portion is slightly formed on the peripheral surface of the impeller (or a wear ring attached to the impeller; hereinafter the same). They are facing each other with a large gap.

A technique relating to a liner ring provided in such a vertical shaft type pump is described in Patent Document 1, for example. In the pump device described in Patent Document 1, a spiral protrusion that spreads radially outward along the rotation direction of the impeller is provided on the upper surface portion of the elastic body of the liner ring. By providing such a protrusion, foreign matter such as sand and clay that accumulates near the liner ring while the pump device is stopped, and continues to stay on the swirling flow generated near this even after the operation is restarted, It can be forcibly discharged to the outside of the impeller. Further, it is possible to reduce the flow velocity of the swirling flow and suppress wear of the casing due to foreign matter.

JP, 10-89281, A

However, in the pump device as described in Patent Document 1 described above, the gap between the lip portion and the impeller may be large due to the structure of the lip portion provided inside the liner ring. Therefore, for example, when the pump is stopped, the foreign matter that naturally flows into the casing and enters this gap is caught when the operation is restarted, which may lead to abnormal wear of the lip portion and the impeller peripheral surface facing the lip portion. there were. Further, there is a possibility that foreign matter may not be discharged due to a secondary flow generated between the spiral protrusion and the impeller, depending on operating conditions. Furthermore, in order to provide the spiral protrusion, the elastic body portion of the liner ring must have a sufficient width in the radial direction, but by doing so, the elastic body portion becomes thinner than its thickness, The strength could be reduced.

The present invention has been made in view of the above points. One of the objects of the present invention is to provide a vertical pump apparatus that can effectively reduce the influence of foreign matter accumulated near the liner ring on the operation of the pump.

According to an aspect of the present invention, a main shaft that transmits a rotational driving force, an impeller attached to the main shaft, a peripheral wall that surrounds the main shaft and the impeller, and an inner side of the peripheral wall that separates an inlet side and an outlet side of the impeller. A liner ring that seals between a casing including a partition wall, the partition wall, and a peripheral surface between an inlet and an outlet of an impeller, the liner ring including a lip portion facing the peripheral surface, and a plurality of notches in the lip portion. A pump device is provided that includes a formed liner ring.

In the above configuration, the plurality of notches provide the flow path for discharging the foreign matters accumulated near the liner ring. Therefore, it is possible to prevent foreign matters from being accumulated or being caught between the liner ring and the impeller to affect the operation of the pump.

In the above-described pump device, the lip portion may include a wall-shaped portion rising from an outer portion of the lip portion formed on the liner ring, and the cutout portion may be formed in at least the wall-shaped portion.
By forming the notch in the wall-shaped part that constitutes the lip part, the flexibility of the lip part against radial deformation is improved, and a predetermined gap is maintained between the lip part and the peripheral surface of the impeller. As a result, it is possible to prevent abnormal wear and the like from occurring due to foreign matter being caught in the gap.

Moreover, in the above-described pump device, the plurality of notches may equally divide the lip portion in the circumferential direction.
By equally dividing the lip portion in the circumferential direction by the plurality of notches, the effect of the notches may be maximized.

It is sectional drawing of the pump part containing the impeller and casing of the pump apparatus which concerns on one Embodiment of this invention. It is a top view of a liner ring installed in the pump device concerning one embodiment of the present invention. FIG. 3 is a perspective sectional view of the liner ring shown in FIG. 2 taken along line III-III.

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

FIG. 1 is a sectional view of a pump portion including an impeller and a casing of a pump device according to an embodiment of the present invention. Referring to FIG. 1, the pump portion of the pump device 10 includes an impeller 12 attached to the main shaft 11, and a casing 13 that houses the main shaft 11 and the impeller 12. The main shaft 11 is connected to a drive source (not shown) such as an electric motor, and transmits the rotational driving force to the impeller 12. The impeller 12 pressurizes the fluid sucked from the inlet 12a by centrifugal force and discharges the fluid from the outlet 12b. The discharged fluid is redirected by the arcuate surface 14 attached to the casing 13, passes through the guide vanes 15, and reaches the inlet 12a of the impeller 12 at the next stage. In this way, in the pump device 10, the fluid sucked from the suction port (not shown) below the pump portion is pressurized in multiple stages by the plurality of impellers 12 provided in the pump portion, It is discharged from a discharge port (not shown) above the portion.

In the illustrated example, the casing 13 has a structure in which the peripheral wall 13a and the partition wall 13b are integrated. In another example, the peripheral wall 13a and the partition wall 13b are separate bodies, and the casing 13 may be configured by connecting them. The peripheral wall 13a surrounds the impeller 12, and together with the circular arc surface 14 and the guide blade 15, forms a space that serves as a flow path for the fluid pressurized by the rotation of the impeller 12. The partition wall 13b extends toward the impeller 12 inside the peripheral wall 13a and separates the inlet 12a side and the outlet 12b side of the impeller 12 from each other. Further, a liner ring 20 is provided at an end of the partition wall 13b close to the impeller 12 to seal between the partition wall 13b and the peripheral surface 12c of the impeller 12. Here, the peripheral surface 12c is located between the inlet 12a and the outlet 12b of the impeller 12. The liner ring 20 is, for example, a ring-shaped member formed by coating a core material with an elastic body, and the elastic body portion faces the peripheral surface 12c of the impeller 12 with a slight gap, thereby forming a partition wall 13b. The space between the peripheral surfaces 12c is sealed. As a result, in the pump device 10, a pressure difference is maintained such that the inlet 12a side of the impeller 12 has a low pressure and the outlet 12b side has a high pressure.

FIG. 2 is a plan view of a liner ring installed in the pump device according to the embodiment of the present invention. FIG. 3 is a perspective sectional view of the liner ring shown in FIG. 2 taken along the line III-III. Referring to FIGS. 2 and 3, the liner ring 20 includes a core material 21 and an elastic body portion 22 that covers the core material. The core member 21 is connected to the end of the partition wall 13b by an arbitrary hermetic fixing structure (not shown). A groove portion 22a and a lip portion 22b are formed in the elastic body portion 22. The lip portion 22b includes a wall-shaped portion that rises from the groove portion 22a that is an outer portion thereof. In the liner ring 20 thus configured, the innermost lip portion 22b faces the peripheral surface 12c of the impeller 12. The liner ring 20 is designed so that the gap between the lip portion 22b and the peripheral surface 12c is small, and thus the function of the liner ring 20 for sealing between the peripheral surface 12c and the partition wall 13b is realized. It

Further, in this embodiment, two notches 23 are formed in the lip portion 22b. As a result, in the liner ring 20, the space between the peripheral surface 12c and the partition wall 13b is sealed as a whole, while the notch 23 provides a flow path for a fluid containing a foreign substance such as sand or clay. Since foreign matter such as sand and clay has a larger specific gravity than a fluid such as water, the foreign matter is easily separated from the fluid flowing upward from the outlet 12b of the impeller 12 along the arc surface 14 and accumulated near the liner ring 20. .. When the liner ring 20 does not have the notch 23, foreign matter is accumulated in the groove 22a and the like near the liner ring 20, and the accumulated foreign matter is entrained in the swirling flow generated around the impeller 12 to cause the casing 13 and the arc surface 14 to move. May cause wear. In the present embodiment, the notch 23 provides a flow path for the fluid containing the foreign matter, so that the foreign matter accumulated near the liner ring 20 can be effectively discharged.

More specifically, for example, during operation of the pump device 10, a small amount of fluid including foreign matter passes through the cutout portion 23 from the outlet 12b side due to the pressure difference between the inlet 12a side and the outlet 12b side of the impeller 12. The foreign matter accumulated near the liner ring 20 is discharged by the flow toward the inlet 12a side. Further, while the pump device 10 is stopped, the foreign matter passes through the cutout portion 23 and naturally flows down, and finally is discharged from the suction port of the pump device 10 to the outside. At this time, the foreign matter flowing down is guided to the notch 23 having a wide flow path, so that the foreign matter passing through the narrow gap between the peripheral surface 12c of the impeller 12 and the lip portion 22b at a portion other than the notch 23. Decrease. Therefore, it is possible to prevent foreign matter that naturally flows down when the pump device 10 is stopped from being caught in a narrow gap between the peripheral surface 12c and the lip portion 22b and being caught when the operation is restarted to cause abnormal wear or the like. it can.

Further, in the present embodiment, the wall-shaped lip portion 22b is divided into two portions by the two notch portions 23. This improves flexibility of the lip portion 22b against radial deformation, and facilitates maintaining a predetermined gap between the lip portion 22b and the peripheral surface of the impeller 12. If the liner ring 20 has no notch 23, the lip 22b forms a closed annular wall. In this case, the radial deformations of the respective portions affect each other over the entire circumference of the lip portion 22b, so the flexibility of the lip portion 22b against the radial deformation is not necessarily high. Therefore, the radial deformation of the lip portion 22b caused by some reason is not restored, and a portion with a large gap between the lip portion 22b and the peripheral surface of the impeller 12 may continuously occur. Foreign matter accumulated near the liner ring 20 is easily caught in such a portion. In the present embodiment, since the lip portion 22b is divided into two parts, the flexibility with respect to the radial deformation of the lip portion 22b is improved. Therefore, the radial deformation of the lip portion 22b occurs for some reason. However, there is a high possibility that it will be elastically restored. Therefore, a predetermined gap is maintained between the lip portion 22b and the peripheral surface of the impeller 12, and abnormal wear or the like occurs due to foreign matter being caught in the gap during operation of the pump device 10 or during restart of the operation. Can be prevented.

In the above example, two cutouts 23 are formed in the lip portion 22b of the liner ring 20, but the embodiment of the present invention is not limited to such an example. The notch may be formed at three or more places, for example. The number of the cutouts 23 is, for example, the size of the flow path provided by the cutouts 23 is sufficient for discharging foreign matters, or the radial flexibility of the lip portion 22b divided by the cutouts 23 is It can be arbitrarily selected from the viewpoint of whether it is suitable to maintain a predetermined gap with the peripheral surface 12c of the impeller 12.

Further, the plurality of notches 23 formed in the lip portion 22b may equally divide the lip portion 22b in the circumferential direction as in the above example. In this case, the cutouts 23 are evenly arranged in the circumferential direction, so that the foreign matter can be effectively discharged. Further, the notch 23 equally divides the lip portion 22b, so that the effect of improving flexibility of the lip portion 22b against radial deformation can be maximized. However, even when the plurality of notches 23 divide the lip portion 22b unevenly for other design reasons, for example, the above effect can be sufficiently obtained.

The configuration of the pump device 10 referred to in the above description of the embodiment is merely an example. As the pump device according to the embodiment of the present invention, a pump device having any configuration capable of installing the liner ring between the impeller and the casing can be adopted. Further, the liner ring 20 referred to in the above description of the embodiment is also arbitrary in configuration except that the notch 23 is formed in the lip 22b. For example, the structure in which the core material 21 is covered with the elastic body portion 22 and the respective shapes of the core material 21 and the elastic body portion 22 are within the above-described embodiment within a range that is obvious to those skilled in the art from examples of known liner rings. The present invention is not limited to the one referred to in the above description and may be arbitrarily modified, and a pump device including such a liner ring is also included in the technical scope of the present invention.

The preferred embodiments of the present invention have been described above in detail with reference to the accompanying drawings, but the technical scope of the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field of the present invention can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that they also belong to the technical scope of the present invention.

10 pump device 11 main shaft 12 impeller 12a inlet 12b outlet 12c peripheral surface 13 casing 13a peripheral wall 13b partition wall 20 liner ring 22a groove portion 22b lip portion 23 notch portion

Claims (3)

A main shaft extending in the vertical direction so as to transmit the rotational driving force,
An impeller attached to the main shaft,
A casing including a peripheral wall that surrounds the main shaft and the impeller, and a partition wall that separates the inlet side and the outlet side of the impeller inside the peripheral wall,
A liner ring for sealing between the partition wall and a peripheral surface of the impeller surrounding the main shaft so as to form an inlet of the impeller, the liner ring including a lip portion facing the peripheral surface, the lip portion And a liner ring in which a plurality of cutouts are formed in the vertical pump device. The lip portion includes a wall-shaped portion rising from an outer portion of the lip portion formed on the liner ring,
The vertical pump device according to claim 1, wherein the cutout portion is formed at least in the wall-shaped portion. Wherein the plurality of cutout, equally dividing the lip portion in the circumferential direction, stand-type pump according to claim 1 or 2.

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