JPH0736146Y2 - Axial rotation type magnet pump - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention is directed to an axial rotation in which a structure of a split plate which is also a bearing for partitioning a wetted chamber in which a driven rotor for rotatably supporting an impeller comes into contact with a liquid chamber and a pump chamber is improved. Type magnet pump.

[0002]

2. Description of the Related Art Conventionally, there has been a shaft rotary magnet pump of this type having a structure as shown in FIG.

Such a magnet pump has a suction port 3 of a pump head 2 formed in a front portion of a pump housing 1.
When the fluid W sucked in and pumped from the discharge port 4 is discharged from the discharge port 4, the impeller 6 rotatably provided in the pump chamber 5 of the pump head 2 is driven to rotate.

The impeller 6 is supported by the front portion of a driven magnet rotor 8 called a magnet can, in which a driven magnet 7 is embedded in the outer periphery, and the driven operation of the driven magnet rotor 8 causes a pumping operation. It is supposed to be.

The rotary shaft 9 of the driven magnet rotor 8
Is rotatably supported by a split plate 12 that partitions a space between the pump 10 and the pump chamber 5 fixed to the pump housing 1 side through a sleeve 10 and a bearing member 11.

As shown in FIG.
As shown in FIG. 4, four through holes 13 and 14 are formed at a predetermined interval in the circumferential direction, and these through holes 13 and 14 are formed.
Connects the liquid contact chamber 16 formed by a rear casing 15 fixed to the pump housing 1 side so as to cover the outer periphery of the driven magnet rotor 8 and the pump chamber 5.

A drive magnet rotor 17 is rotatably provided on the outer periphery of the rear casing 15,
A drive magnet 18 is provided on the inner circumference of the drive magnet rotor 17 so as to correspond to the driven magnet 7 of the driven magnet rotor 8.

The drive magnet rotor 17 is adapted to rotate the driven magnet rotor 8 by the rotation of the drive motor 19.

That is, the split plate 12 also serves as a support member for the bearing member 11 that supports the rotary shaft 9 of the driven magnet rotor 8 in the above-described shaft rotary magnet pump, and also contacts the pump chamber 5 and the liquid. Chamber 16
The fluid W on the pump chamber 5 side is introduced into the liquid contact chamber 16 by making the through holes 14 and 15 communicate with each other.
During operation, the cooling function of sliding heat generated in the sliding portion between the sleeve 10 and the bearing member 11 provided on the rotary shaft 9 of the driven magnet rotor 8 is enhanced, while the water hammer on the pump chamber 5 side is prevented. The rear casing 15 on the liquid contact chamber 16 side is provided with a cushioning effect so as not to be largely transmitted.

[0010]

However, in the above-described shaft rotary magnet pump of the conventional structure, the through holes 13 and 14 provided in the split plate 12 are in the shape of a circular tube of equal diameter in the axial direction. Therefore, it is impossible to smoothly introduce the fluid W, which is generated in the pump chamber 5 by the rotation of the impeller 6 (rotation direction X), to the liquid contact chamber 16 side by utilizing the pressure energy of the vortex flow on the outer peripheral side having the highest pressure. , By this, the fluid W
The circulation efficiency is poor, and the cooling effect of the sliding portion cannot be fully exerted.

Further, there has been a problem that slurry such as crystals and solids is easily deposited on the inner bottom portion 16a in the liquid contact chamber 16 and its removal is troublesome.

An object of the present invention is to effectively utilize the pressure energy and the dynamic energy of the fluid generated in the pump chamber by the rotation of the impeller to enhance the cooling effect of the sliding portion in the liquid contact chamber. To provide a shaft rotation type magnet pump.

[0013]

In order to solve the above-mentioned problems, the present invention provides a pump housing provided with a pump head having an inlet and an outlet, and rotatably provided in a pump chamber of the pump housing. An impeller, a driven magnet rotor that supports the impeller, a split plate that rotatably supports the rotation shaft of the driven magnet rotor, and a partition wall between the impeller and the pump chamber, and at least the upper and lower portions of the split plate. A rear casing fixed to the pump housing side so as to form a liquid contact chamber communicating with the pump chamber through a plurality of through holes provided and covering the outer periphery of the driven magnet rotor, and the rear casing. Axial rotation including a drive magnet rotor that rotatably drives the driven magnet rotor that is rotatably provided in between. In the type magnet pump, the through hole provided in the upper portion of the split plate has an opening on the pump chamber side formed in an elongated hole shape extending in the radial direction, and the central axis along the radial direction of the opening is defined by the split plate. The outer end of the opening is inclined with respect to the radial central axis so as to be positioned on the side opposite to the rotation direction of the impeller with respect to the inner end thereof, and is directed toward the opening on the liquid contact chamber side. This is a reduced structure.

Further, according to this invention, the opening on the pump chamber side of the through hole provided at least at the lowermost part of the split plate is formed in the shape of an elongated hole extending in the radial direction, and the center of the opening along the radial direction. The shaft is inclined with respect to the radial center axis of the split plate such that the outer end of the opening is located on the rotation direction side of the impeller with respect to the inner end thereof, and the opening on the liquid contact chamber side is formed. Is formed so as to widen from the inside toward the outside toward the pump chamber side.

[0015]

That is, according to this invention, the opening on the pump chamber side of the through hole provided in the upper portion of the split plate is formed in the shape of an elongated hole extending in the radial direction, and the central axis along the radial direction of this opening is split. With respect to the radial central axis of the plate, the outer end of the opening is inclined so that it is located on the side opposite to the inner end of the plate in the direction of rotation of the impeller, and contracts toward the opening on the liquid contact chamber side. Therefore, the fluid in the pump chamber can be introduced to the liquid contact chamber side by the pressure-feeding action by the pressure energy of the vortex flow on the outermost side of the fluid generated in the pump chamber due to the rotation of the impeller. become.

Further, the opening on the pump chamber side of the through hole provided at the lowermost part of the split plate is formed in the shape of an elongated hole extending in the radial direction, and the central axis along the radial direction of this opening is the diameter of the split plate. With respect to the central axis of the direction, the outer end of the opening is inclined so that it is located on the impeller rotation direction side with respect to the inner end, and the opening on the liquid contact chamber side is directed from the inside toward the outside toward the pump chamber. Since it is formed to expand,
The fluid in the liquid contact chamber can be sucked and discharged to the pump chamber side by the suction action by the dynamic energy of the vortex flow on the outer peripheral side having the highest pressure of the fluid generated in the pump chamber by the rotation of the impeller.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings shown in FIGS. In the illustrated embodiment according to the present invention, the same reference numerals are used for the portions having the same structures as those of the conventional structure shown in FIGS. 3 and 4.
The description is omitted.

That is, according to the present invention, as shown in FIGS. 1 and 2, the openings 13a on the pump chamber 5 side of the three through holes 13 provided on the upper side of the split plate 12 extend in the radial direction. The center axis aa formed in the shape of a hole and extending in the radial direction of the opening 13a is shown in FIG. 1 with respect to the center axis o-o of the split plate 12 in the radial direction. As described above, the spiral shape is formed in the circumferential direction by inclining at an appropriate inclination angle θ ₁ (for example, θ ₁ = 45 °) so as to be located on the side opposite to the rotation direction X of the impeller 6 with respect to the inner end 13c. In addition, the inclination angle α ₁ is such that it contracts toward the opening 13d on the liquid contact chamber 16 side from the outer circumference on the pump chamber 5 side to the inner circumference. .

On the other hand, the opening 14a of the through hole 14 provided at the lowermost portion of the split plate 12 on the pump chamber 5 side is formed in the shape of an elongated hole extending in the radial direction like the through hole 13 on the upper side. A central axis b-b along the radial direction of the opening 14a is set with respect to a central axis o-o of the split plate 12 in the radial direction, and an outer end 14b thereof is set to an inner end 1 as shown in FIG.
4c is inclined at an appropriate inclination angle θ ₂ (for example, θ ₂ = 45 °) so as to be positioned on the rotation direction X side of the impeller 6, and the opening 14d on the liquid contact chamber 16 side faces the pump chamber 5 side. It has a configuration in which it has an inclination angle α ₂ that spreads from the inner circumference to the outer circumference.

According to the structure of the present invention described above, however, the opening 13a of the through hole 13 provided on the upper side of the split plate 12 on the pump chamber 5 side is formed in the shape of an elongated hole extending in the radial direction. Moreover, the central axis aa along the radial direction of the opening 13a is defined as the central axis o in the radial direction of the split plate 12.
With respect to −o, the outer end 13b is inclined so as to be located on the side opposite to the rotation direction X of the impeller 6 with respect to the inner end 13c, and is formed in a spiral shape in the circumferential direction. Pump chamber 5 toward the side opening 13d
Since it is contracted from the outer periphery on the side to the inner periphery in a tapered shape, from the upper side through hole 13, the fluid W generated in the pump chamber 5 by the rotation of the impeller 6 on the outer peripheral side having the highest pressure. The fluid W in the pump chamber 5 can be introduced to the liquid contact chamber 16 side in a pumped state by the pumping action by the pressure energy of the vortex flow.

Moreover, the opening 14a on the pump chamber 5 side of the through hole 14 provided at the lowermost portion of the split plate 12 is also formed in the shape of an elongated hole extending in the radial direction like the through hole 13 on the upper side, and this opening is formed. With respect to the radial center axis o-o of the split plate 12,
The outer end 14b is tilted at an appropriate tilt angle θ (for example, θ = 45 °) so as to be positioned on the rotation direction X side of the impeller 6 with respect to the inner end 14c, and the opening 14d on the liquid contact chamber 16 side is pumped. Since it is formed so as to expand from the inner circumference to the outer circumference toward the chamber 5, the suction of the fluid W generated in the pump chamber 5 by the rotation of the impeller 6 by the dynamic energy of the vortex on the outermost side having the highest pressure. By the action, the fluid W in the liquid contact chamber 16 can be sucked to the pump chamber 5 side, and the slurry accumulated on the inner bottom portion 16a of the liquid contact chamber 16 can be removed to the pump chamber 5 side. Become.

In the above-described embodiment, the opening widths of the through holes 13, 14 provided in the upper and lower portions of the split plate 12 on the pump chamber 5 side in the shape of elongated holes and the liquid contact chamber 16 side. The opening diameters of the circular hole-shaped openings 13d and 14d are equal to each other, but the openings 13a and 14a on the pump chamber 5 side are
And the openings 13d and 14d on the side of the liquid contact chamber 16 are formed in the shape of long holes having the same length, and only the opening width is formed so as to decrease from the pump chamber 5 side toward the liquid contact chamber 16 side. Is also good.

Further, even if either one of the through holes 13 and 14 provided in the upper and lower parts of the split plate 12 is formed in the above-mentioned form, the function and effect of the present invention can be sufficiently exhibited. Is.

[0024]

As is apparent from the above description, according to the present invention, the opening on the pump chamber side of the through hole provided in the upper portion of the split plate is formed in the shape of an elongated hole extending in the radial direction, and this opening is formed. The center axis along the radial direction of the split plate with respect to the radial center axis of the split plate so that the outer end of the opening is positioned on the side opposite to the inner end of the rotation direction of the impeller, and Since the pressure is reduced toward the opening on the liquid chamber side, the pressure energy of the vortex flow on the outer peripheral side, which is the highest pressure of the fluid generated in the pump chamber by the rotation of the impeller, is used,
The fluid in the pump chamber can be introduced into the liquid contact chamber in a pressure-feeding state, whereby the circulation efficiency of the fluid in the liquid contact chamber can be increased, and the cooling effect of the sliding portion can be improved. .

According to a second aspect of the present invention, the opening on the pump chamber side of the through hole provided in the lowermost portion of the split plate is formed in the shape of an elongated hole extending in the radial direction, and the central axis of the opening along the radial direction. With respect to the radial center axis of the split plate so that the outer end of the opening is located closer to the impeller rotation direction side than its inner end, and the opening on the liquid contact chamber side is located on the pump chamber side. If it is formed so as to expand from the inner side toward the outer side, the fluid in the liquid contact chamber can be removed by utilizing the suction effect of the kinetic energy of the vortex on the outermost side of the fluid generated in the pump chamber due to the rotation of the impeller. It is possible to suck into the pump chamber side, and by this, the synergistic effect with the upper through hole can further improve the circulation efficiency of the fluid in the liquid contact chamber,
It is possible to improve the cooling effect of the sliding portion in the liquid contact chamber.

Further, due to the suction action and the formation of the inclined portion that expands from the inner side to the outer side of the lowermost through hole toward the pump chamber side, the slurry accumulated in the liquid contact chamber is smoothly removed to the pump chamber side. can do.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of an embodiment of a split plate used in a shaft-rotating magnet pump according to the present invention viewed from the pump chamber side.

FIG. 2 is an explanatory view showing the entire structure of the same shaft rotary magnet pump, with the main parts cut away, as seen from the direction of arrows II-II in FIG.

FIG. 3 is an explanatory view showing an entire structure of a conventional shaft rotation type magnet pump with a main part cut away.

FIG. 4 is a cross-sectional view showing a split plate as seen from the liquid contact chamber side in the direction of arrows IV-IV in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pump housing, 2 ... Pump head, 3 ... Suction port, 4 ... Discharge port, 5 ... Pump chamber, 6 ... Impeller, 8 ... Followed magnet rotor, 9 ... Rotating shaft, 11 ... Bearing member, 12 ... Split plate, 13 ... Upper through hole, 13a ... Opening portion (pump chamber side), 13b ... Outer end, 13c ...・ Inner end, 13d ... Opening part (wetted chamber side), 14 ... Bottom through hole, 14a ... Opening part (pump chamber side), 14b ... Outer end, 14c ... Inner side End, 14d ... Opening part (wetted chamber side), 15 ... Rear casing, 16 ... Wetted chamber, 17 ... Drive magnet rotor, 19 ... Drive motor, X ... Impeller Rotation direction, aa ... Central axis of the opening of the elongated hole of the upper through hole on the pump chamber side, b- ... center of the pump chamber side slot opening of the lower through-hole axis, o-o ... Split plate center axis in the radial direction of, θ _1, θ ₂ ··· inclination angle, α _1, α ₂ · ..Inclination angle, W ... Fluid

Claims (2)

[Scope of utility model registration request] 1. A pump housing having a pump head having an intake port and a discharge port, an impeller rotatably provided in a pump chamber of the pump housing, a driven magnet rotor supporting the impeller, and the driven magnet rotor. A rotatably rotatably supporting shaft of the shaft, and a partition plate for partitioning the pump chamber from the pump chamber, and a connecting plate communicating with the pump chamber through a plurality of through holes provided at least at upper and lower portions of the split plate. A rear casing fixed to the pump housing so as to form a liquid chamber and to cover the outer periphery of the driven magnet rotor, and the driven magnet rotor rotatably provided via the rear casing are driven to rotate. A rotary magnet pump having a drive magnet rotor for The through-hole has an opening on the pump chamber side formed in an elongated hole shape extending in the radial direction, and the central axis along the radial direction of the opening is defined with respect to the central axis of the split plate in the radial direction. The outer rotary end of the shaft is inclined so that the outer end is located on the side opposite to the rotation direction of the impeller with respect to the inner end, and the outer end is reduced toward the opening on the liquid contact chamber side. . 2. A through hole provided at least at the lowermost portion of the split plate has an opening on the pump chamber side formed in an elongated hole shape extending in the radial direction, and a central axis along the radial direction of the opening is defined by the split. With respect to the radial center axis of the plate, the outer end of the opening is inclined so that the outer end is located closer to the rotation direction side of the impeller than the inner end, and the opening on the liquid contact chamber side is on the pump chamber side. The shaft rotary magnet pump according to claim 1, wherein the shaft rotary magnet pump is formed so as to widen from the inside toward the outside.