JP6671983B2 - Casing cover and pump device - Google Patents

Description

  An embodiment of the present invention relates to a casing cover for covering a pump casing and a pump device.

  The pump device includes, for example, a pump casing that internally forms a pump chamber, a casing cover that covers an upper opening formed in the pump casing, an impeller disposed in the pump casing, a motor that rotationally drives the impeller, and a casing. And a mechanical seal supported by the cover.

  The casing cover is, for example, a lid having a through-hole for closing the opening of the pump casing and passing the rotation shaft of the motor, a motor fixing portion fixed to the motor, and a flange-shaped fixing portion fixed to an opening edge of the pump casing. A casing fixing portion. A support groove for supporting the mechanical seal is formed near the hole of the lid.

  In the case of a vertically installed pump device in which the rotation axis of the motor is arranged along the vertical direction, air bubbles are mixed in the fluid and collected at the upper portion, so that air is accumulated in the mechanical seal portion and dry operation is easily performed. For this reason, in order to suppress the dry operation, there has been provided an apparatus in which a hole for air bleeding is formed in the lid to periodically perform the air bleeding operation.

  In addition, from the viewpoint of improving safety, a technique has been provided in which a protective member is separately provided around the rotation shaft in order to prevent an operator from touching the rotation shaft.

JP 2005-57934 A

  In a configuration in which the protection member is provided separately, the structure is complicated. Further, in this case, a step of removing a protection member or the like is required at the time of inspection work such as leakage of a mechanical seal or air bleeding work, which complicates the work.

  Therefore, it is desired to provide a casing cover and a pump device that have a simple structure and can suppress the dry operation.

A casing cover according to an aspect of the present invention includes a first flange-shaped fixing portion fixed to a motor, and a pump disposed below the first fixing portion and containing an impeller connected to a rotation shaft of the motor. A second fixing portion fixed to an opening edge of the casing, extending downward from the first fixing portion, connecting between the first fixing portion and the second fixing portion, and surrounding a rotation axis of the motor; A cylindrical peripheral wall portion, a wall-shaped member disposed at an opening of the pump casing and partitioning a space between the pump casing side and the motor side, wherein a through-hole through which the rotating shaft can be inserted; And a support portion for supporting a mechanical seal mounted on the pump casing side at a position above the sliding surface of the mechanical seal on the peripheral wall portion. In the space of Are holes that are formed, the peripheral wall portion, the extending below the second fixing portion and the inner lid part, an upper side of the support portion, the lower side of the inner lid, the pump casing The inner lid portion includes a guide portion that partially projects upward and expands the space on the pump casing side upward, and the hole portion is located at a position facing the guide portion of the peripheral wall portion. It is characterized by being provided in .

  A pump device according to another aspect of the present invention includes the casing cover, a motor fixed to the first fixing portion, an opening into which the peripheral wall portion can be inserted, and the second fixing of the casing cover. A pump casing provided with a mounting portion fixed to the portion, and an impeller housed in the pump casing.

  According to an embodiment of the present invention, it is possible to provide a pump casing and a pump device that can suppress a dry operation with a simple structure.

FIG. 1 is a side view showing a configuration of a pump device according to an embodiment of the present invention. FIG. 3 is a perspective view showing a configuration of a casing cover of the pump device. FIG. 3 is a perspective view showing a configuration of the casing cover. FIG. 3 is a perspective view showing a configuration of the casing cover. Sectional drawing which shows the structure of the same casing cover.

  Hereinafter, a pump device 10 and a casing cover 12 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a side view showing the pump device 10 in a partial cross section. 2 to 4 are perspective views of the casing cover 12, and FIG. 5 is a sectional view of the casing cover.

  As shown in FIG. 1, a pump device 10 includes a pump casing 11 that accommodates an impeller, a casing cover 12 that seals the pump casing 11, an impeller disposed in the pump casing 11, and a motor 14 that rotationally drives the impeller. A mechanical seal 15 that is supported by the casing cover 12 and seals the space between the rotating shaft 14 a of the motor 14 and the casing cover 12, and a gantry 16 that supports the pump casing 11.

  The pump device 10 is installed on a gantry 16, for example, and is vertically installed in an installation space with, for example, a rotation shaft 14a of a motor 14 extending vertically.

  The pump casing 11 is made of, for example, a metal material, and has a pump chamber 20 that houses an impeller therein, a suction part 21 having a suction port 21a at one end, and a lower end connected to a lower part of the pump chamber 20; A discharge portion 22 having one end connected to the outer peripheral portion of the pump chamber 20 and extending in a volute shape and having a discharge port 22a at the other end.

  The pump casing 11 has an upper opening 24 that opens above the pump chamber 20, and a flange-like mounting portion 24 a is provided at the opening edge.

  The impeller provided in the pump chamber 20 includes at least one disk-shaped shroud and at least one blade member formed in the shroud. The impeller has a circular impeller inlet at the center of the lower surface thereof, and an outlet for discharging fluid on the outer periphery.

  Inside the pump casing 11, when the impeller is accommodated in the pump chamber 20, the pump casing 20 reaches the inlet provided at the lower end of the pump chamber 20 from the suction port 21 a, and discharges from the outlet to the outside of the pump chamber 20. A predetermined flow path leading to the outlet 22a is formed.

  The impeller is connected to the rotating shaft 14a of the motor, and rotates by driving the motor 14, thereby sucking fluid from the inlet and discharging the fluid outward and circumferentially from the outlet 13b on the outer periphery. The impeller sends fluid from the primary side to the secondary side by rotation.

  The gantry 16 is configured to have a horizontal installation surface 16a arranged at a predetermined height, and supports the lower part of the pump casing 11 with the installation surface 16a to support the pump device 10 in a vertically installed state.

  The casing cover 12 shown in FIGS. 2 to 5 is integrally formed of a metal material by, for example, casting. The casing cover 12 includes a first flange-shaped fixing portion 33 fixed to the motor 14, a second flange-shaped fixing portion 34 fixed to the upper opening 24 of the pump casing 11, and a cylinder surrounding the outer periphery of the rotating shaft 14 a. Exhaust valve attached to a hole 32a of the peripheral wall portion 32 integrally with a peripheral wall portion 32 having a rectangular shape, and an inner lid portion 31 for partitioning a space inside the peripheral wall portion 32 and closing an upper opening 24 of the pump casing 11. 17 is provided.

  The first fixing portion 33 is formed, for example, as an annular plate-like member, and has a plurality of mounting holes 33a formed in a peripheral portion thereof. The casing cover 12 is fixed to the motor 14 by being fastened to the mounting portion on the motor 14 side by a fastening member 18 such as a bolt in the plurality of mounting holes 33a.

  The second fixing portion 34 is located below the first fixing portion 33, is larger than the upper opening 24, and has a circular outer shape.

  A plurality of mounting holes 34a are formed in a peripheral portion of the second fixing portion 34. The casing cover 12 is fixed to the pump casing 11 by fastening the plurality of attachment holes 34a to the flange-like attaching section 24a of the pump casing 11 with the fastening members 19 such as bolts.

  The peripheral wall portion 32 is a cylindrical member extending from the inner edge of the first fixing portion 33 along the axial direction, that is, a cylindrical member extending toward the pump casing 11, and the distal end portion thereof is lower than the second fixing portion 34 and the supporting portion 31 f. At a predetermined position in the pump casing 11. The peripheral wall portion 32 connects between the first fixing portion 33 and the second fixing portion 34, and covers a space around the rotation shaft 14a. The peripheral wall portion 32 has an outer diameter that can be inserted into the upper opening 24.

  In the peripheral wall portion 32, a hole portion 32a that connects the internal space to the outside is formed at a position closer to the motor 14 than the installation position of the mechanical seal 15, that is, a position above the installation state.

  The hole 32a is, for example, a through hole that penetrates the peripheral wall 32 in the radial direction. The hole 32a is disposed between the first fixing portion 33 and the second fixing portion 34 at a predetermined position above the sliding surface of the mechanical seal 15 so as to face the guide portion 31d.

  The hole 32a is closed by, for example, the exhaust valve 17 configured in a double structure. By loosening or removing the exhaust valve 17 during the air bleeding operation, the air accumulated in the internal space is discharged from the hole 32a.

  At a predetermined position of the peripheral wall portion 32, at least one inspection window portion 32b is provided. The window 32b is configured so that the internal space, that is, the space around the rotation axis 14a, can be viewed from the outside. For example, in the present embodiment, the window portions 32b are rectangular openings disposed between the cover portion 31c and the first fixing portion 33, and are provided at two locations in the circumferential direction.

  The inner lid portion 31 includes a partition wall portion 31a which is a partition partitioning a region inside the peripheral wall portion 32 up and down, that is, a partition between the motor 14 side and the pump casing 11 side, and a tubular portion 31b provided at a center side of the partition wall portion 31a. , Are continuously and integrally provided.

  The partition wall portion 31a constitutes a flat plate-like cover portion 31c that is mostly arranged at the position of the second fixing portion 34 in the circumferential direction, and constitutes a guide portion 31d that partially projects upward in the circumferential direction. I have.

  The cover portion 31c forms a wall orthogonal to the rotation axis 14a at the position of the second fixing portion 34 of the peripheral wall portion 32. On the motor side surface of the cover portion 31c, a groove 31g is formed from the outer peripheral portion of the through hole 31e to the outer peripheral edge of the cover portion 31c and the vicinity of a window portion 32b described later. When there is a liquid leak from the rotating shaft 14a of the motor, the fluid flows through the groove 31g to the window 32b. Therefore, the inspection work from the window 32b can be easily and accurately performed.

  The guide part 31d continuously and gently curves upward from the cover part 31c to form a flow path reaching the hole part 32a.

  The cylindrical portion 31b has a through hole 31e into which the rotating shaft 14a can be inserted. In addition, a groove-shaped support portion 31f that supports the fixed ring 15a of the mechanical seal 15 is provided on the inner surface of the distal end of the cylindrical portion.

  The mechanical seal 15 includes a fixed ring 15a supported by the support portion 31f, a rotating ring 15b fixed around, for example, the rotating shaft 14a, and a spring configured to bias the rotating ring 15b toward the fixed ring 15a. And a biasing member 15c. The upper surface of the rotating ring 15b is pressed against the lower surface of the fixed ring 15a by the biasing member 15c. Thus, the fixed ring 15a and the rotating ring 15b slide on opposite surfaces.

  The casing cover 12 has a first fixing part 33 fixed to the motor 14 side, a second fixing part 34 fixed to the upper opening 24 of the pump casing 11, and a mechanical seal 15 on the support part 31 f at the tip end of the inner lid part 31. I support. Thereby, the gap between the rotating shaft 14a and the pump casing 11 is sealed.

  In the pump device 10 configured as described above, when the rotor of the motor 14 rotates, the rotating shaft 14a rotates at a predetermined rotation speed. Accordingly, the impeller attached to the rotating shaft 14a rotates at a predetermined rotation speed.

  By the rotation of the impeller, the pump device 10 sucks the fluid from the suction port 21 a of the pump casing 11. The fluid flows into the impeller inlet from the inlet 21a through the suction part 21, is pressurized, and flows out from the impeller outlet. Further, the fluid discharged from the impeller outlet is guided to the discharge port 22a through the discharge part 22, and is sent to the secondary side.

  In the pump device 10, since the inner lid portion 31 is formed above the mechanical seal 15, the annular portion that is surrounded by the peripheral wall portion 32 below the inner lid portion 31 and communicates with the inside of the pump casing 11. A space having a shape is formed above the mechanical seal 15. Therefore, the air in the pump casing 11 is collected in a space above the mechanical seal 15. In addition, since a part of this space protrudes upward by the guide portion 31d and communicates with the upper hole 32a, the air is guided to the upper hole 32a during the air bleeding operation.

  In the pump device 10, for example, at a predetermined position near the suction port 21a and the discharge port 22a, a hole 25a communicating from the outside of the pump casing 11 to a flow path in the pump casing 11 is formed. It is configured such that priming water can flow through the hole 25a. Then, at the time of priming work, by filling the internal space with priming water, the air is discharged from the hole 32a. Further, in the pump device 10, the air bleeding operation can be performed periodically by loosening the exhaust valve 17.

  According to the casing cover 12 and the pump device 10 according to the present embodiment, the following effects can be obtained. That is, the casing cover 12 includes the peripheral wall portion 32 that covers the outer periphery of the rotating shaft 14a integrally with the first fixing portion 33 and the second fixing portion 34, thereby protecting the periphery of the rotating shaft 14a with a simple configuration. The operator's fingers can be prevented from touching the rotating shaft 14a.

  Further, the strength of the casing cover 12 can be improved by the wall-shaped peripheral wall portion 32 surrounding between the first fixing portion 33 and the second fixing portion 34.

  Further, since the inner lid portion 31 forms a space above the support portion 31 f that supports the mechanical seal 15, when air enters the pump casing 11, the air enters the space above the mechanical seal 15. Due to the accumulation, the accumulation of air in the mechanical seal 15 can be suppressed, and the dry operation can be prevented.

  Further, by providing the air vent hole 32a at a position higher than the sliding surface 15s of the mechanical seal 15 on the side surface of the peripheral wall portion 32, the air can be vented with a simple configuration and a simple operation. .

  In addition, the casing cover 12 includes a guide portion 31d that extends a part of the inner lid portion 31 upward to expand a space communicating with the pump casing 11 upward, so that air can be effectively transmitted to the hole portion 32a. Guidance can be provided, and maintenance work can be simplified.

  Further, since the casing cover 12 is provided with the window 32b on the outer peripheral side, the inspection work can be easily performed during the operation of the pump. Further, since a groove 31g extending from the outer peripheral portion of the through hole 31e to the vicinity of the window portion 32b is formed on the motor side surface of the cover portion 31c, if there is a liquid leak from the rotating shaft 14a of the motor, this groove will Since the fluid flows through the window 32b along the window 31g, the inspection work from the window 32b can be performed easily and with high accuracy.

  Further, since the casing cover 12 is composed of a single member having a simple shape having a wall-shaped inner lid portion 31 having a curve and a cylindrical peripheral wall portion 32, the casing cover 12 can be formed by casting. As a result, it is possible to realize multiple functions such as an air bleeding function, a finger insertion preventing function, a guiding function, and an inspection function with one member while reducing the number of assembling steps and reducing manufacturing costs.

  Note that the present invention is not limited to the above embodiments as they are, and can be embodied by modifying the constituent elements in an implementation stage without departing from the scope of the invention.

In addition, each component exemplified in the above embodiment may be deleted, and the shape, structure, material, and the like of each component may be changed. Various inventions can be formed by appropriately combining a plurality of components disclosed in the above embodiments.
Hereinafter, the inventions described in the claims of the present application will be additionally described.
(1)
A first fixing portion having a flange shape fixed to the motor;
A second fixing portion fixed to an opening edge of a pump casing that houses an impeller connected to a rotation shaft of the motor;
A cylindrical peripheral wall portion that connects between the first fixed portion and the second fixed portion and surrounds a rotation axis of a motor;
A wall-shaped member disposed at an opening of the pump casing and partitioning a space between the pump casing side and the motor side, a through hole through which the rotating shaft can be inserted, and a mechanical seal mounted on the rotating shaft. An inner lid part, comprising: a supporting part for supporting;
With one,
A casing cover, characterized in that a hole communicating with the space on the pump casing side is formed at a position of the peripheral wall portion at one end side in the axial direction from a sliding surface of the mechanical seal.
(2)
The peripheral wall portion extends to one end side from the second fixing portion and the inner lid portion, and constitutes a space on the pump casing side at one end side of the support portion and at the other end side of the inner lid portion. And
The inner lid portion includes a guide portion that partially extends to the one end side and enlarges a space on the pump casing side to the one end side,
The casing cover according to (1), wherein the hole is provided at a position of the peripheral wall facing the guide.
(3)
The casing cover according to (2), wherein the peripheral wall portion includes a window portion configured so that an internal space on the motor side can be visually recognized from the outside.
(4)
The casing cover according to (3), wherein the inner lid portion has a groove on an end surface thereof from an outer peripheral portion of the through hole to a vicinity of the window portion.
(5)
A casing cover according to any one of (1) to (4),
A motor fixed to the first fixing portion;
A pump casing having an opening through which the peripheral wall portion can be inserted, and a mounting portion fixed to the second fixing portion of the casing cover;
A pump device comprising: an impeller housed in the pump casing.

  DESCRIPTION OF SYMBOLS 10 ... Pump apparatus, 11 ... Pump casing, 12 ... Casing cover, 13 ... Impeller, 14 ... Motor, 14a ... Rotating shaft, 15 ... Mechanical seal, 15s ... Sliding surface, 17 ... Exhaust valve, 20 ... Pump chamber, 21 ... Suction part, 21a ... Suction port, 22 ... Discharge part, 22a ... Discharge port, 24 ... Top opening, 24a ... Mounting part, 31 ... Inner lid part, 31a ... Partition part, 31b ... Cylinder part, 31c ... Cover part Reference numeral 31d: guide portion, 31e: through hole, 31f: support portion, 31g: groove, 32: peripheral wall portion, 32a: hole portion, 32b: window portion, 33: fixing portion, 33a: mounting hole portion, 34: fixing portion , 34a... Mounting holes.

Claims (4)

A first fixing portion having a flange shape fixed to the motor;
A second fixing portion disposed below the first fixing portion and fixed to an opening edge of a pump casing that houses an impeller connected to a rotation shaft of the motor;
A cylindrical peripheral wall portion extending downward from the first fixing portion, connecting between the first fixing portion and the second fixing portion, and surrounding a rotation axis of the motor;
A wall-shaped member disposed at an opening of the pump casing and partitioning a space between the pump casing side and the motor side, a through hole through which the rotating shaft can be inserted, and a mechanical seal mounted on the rotating shaft. An inner lid part, comprising: a supporting part for supporting;
With one,
A hole communicating with the space on the pump casing side is formed at a position of the peripheral wall portion above the sliding surface of the mechanical seal ,
The peripheral wall portion extends below the second fixing portion and the inner lid portion, and forms a space on the pump casing side above the support portion and below the inner lid portion,
The inner lid portion includes a guide portion that partially projects upward and expands a space on the pump casing side upward,
The casing cover, wherein the hole is provided at a position of the peripheral wall facing the guide . The peripheral wall portion from the outside, provided with a window portion that is visibly constituting the internal space of the motor side, of claim 1, wherein the casing cover. 3. The casing cover according to claim 2 , wherein the inner lid has a groove on an upper surface thereof, the groove extending from an outer peripheral portion of the through hole to a vicinity of the window. 4. A casing cover according to any one of claims 1 to 3 ,
A motor fixed to the first fixing portion;
A pump casing having an upper opening and having a mounting portion fixed to the second fixing portion of the casing cover;
A pump device comprising: an impeller housed in the pump casing.