CN217206908U - Circulating canned motor pump - Google Patents

Abstract

The utility model provides a circulating canned motor pump belongs to canned motor pump technical field. The problem that a shield pump generates large axial force during operation is solved. This circulating canned motor pump, including having the water inlet, the pump body of delivery port and impeller unit and the motor main part that is connected and has the motor shaft with the pump body, and the motor shaft is connected through the bearing with the motor, the motor main part comprises casing, stator subassembly, this casing comprises left connection end cover, right connection end cover and casing, be provided with the circulating pipe between the pump body and the right connection end cover, the pump body is located and has offered on the terminal surface with left connection end cover junction and supply left connection end cover to stretch into the installation mounting hole, left connection end cover is located the left end of mounting hole department and is provided with the outside arch of axial and stretches into the bulge loop portion in the pump body, leave the space between this bulge loop portion and the motor shaft, T type groove has been seted up on the right-hand member portion of motor shaft, I type groove has been seted up on the left end portion of motor shaft. The utility model has the advantages of balanced axial force.

Description

Circulating canned motor pump

Technical Field

The utility model belongs to the technical field of the canned motor pump, a circulating canned motor pump is related to.

Background

The canned pump is a sealless pump, the pump and the drive motor are sealed in a pressure vessel filled with the pumped medium, the pressure vessel has only static seals, and a set of electric wires provides a rotating magnetic field and drives the rotor. The structure eliminates a rotating shaft sealing device of the traditional centrifugal pump, so that the leakage can be completely avoided. When the pump operates, the rotation of the impeller generates water pressure at the front cover plate and the rear cover plate, and the action area of the rear cover plate of the impeller under the action of the water pressure is larger than that of the front cover plate due to the objective existence of the impeller suction inlet, so that the forces acting on the front cover plate and the rear cover plate cannot be balanced with each other, an axial force can be generated, the axial movement of the pump shaft is caused, and the rotor in the motor generates axial displacement under the action of the axial force, so that mutual grinding and collision are caused, and the shielding pump is seriously damaged.

Disclosure of Invention

The utility model aims at the above-mentioned problem that exists among the prior art, provide an effective balanced canned motor pump axial force's mechanism, canned motor pump of the balanced rotor axial force of ability great degree.

The purpose of the utility model can be realized by the following technical proposal: a circulating canned pump, including the pump body with water inlet, delivery port and impeller unit and with the motor body of the motor shaft that links with the pump body, and the motor shaft links with the motor through the bearing, the above-mentioned impeller unit sets up on and motor shaft, the said motor body is made up of casing, stator assembly, the casing is made up of left connection end cap, right connection end cap and body, the above-mentioned left connection end cap, right connection end cap and body cooperate with bearing to form the shell cavity for stator assembly to mount, characterized by that, there is a circulating pipe forming the circulation loop and used for buffering the axial force between right connection end cap and the pump body, one end of the circulating pipe links with delivery port in the pump body, and another end of the circulating pipe links with right end face of the right connection end cap, the end face of the pump body that lies in and left connection end cap junction offer and supply left connection end cap to stretch into the mounting hole, the left end of the left connecting end cover at the mounting hole is provided with a convex ring part which is axially and outwards protruded and extends into the pump body, a gap is reserved between the convex ring part and the motor shaft, the right end part of the motor shaft is provided with a T-shaped groove which is provided with a T-shaped cross section structure and enables the circulating pipe to be communicated with the shell cavity, and the left end part of the motor shaft is provided with an I-shaped groove which is provided with an I-shaped cross section structure and enables the shell cavity to be communicated with the inside of the pump body.

In the above-mentioned circulating canned motor pump, the pump body and left connection end cover link firmly mutually through a plurality of double-screw bolt, and be provided with the sealed pad of strengthening the leakproofness between this pump body and the left connection end cover.

In the above-mentioned circulating canned motor pump, the impeller unit be rotatory impeller, be provided with the bellying that the axial is outside protruding and extend the embedding bulge loop portion on this rotatory impeller's the rear end face, bulge loop portion be located the left end face of bulge department and set up the ring channel one that supplies the bulge portion installation on the right side, leave the space between the inner wall of this ring channel one and the periphery wall of bulge portion.

In foretell a circulating canned motor pump, protruding ring portion on seted up a plurality of and set up and be used for buffering circulation circuit's buffering way along its circumferencial direction, a plurality of buffering way all is the slope setting, says through this buffering and makes the inside and outside of protruding ring portion be linked together, the protruding ring portion be located the outward flange of left end terminal surface on seted up ring channel two, this ring channel two extends to buffering way department, and is linked together with buffering way.

In the above-mentioned circulating canned motor pump, the periphery wall of motor shaft that is located I type groove department sets up the outside bellied fender flow ring of right radial direction.

Compared with the prior art, the circulating type canned motor pump has the following advantages:

1. the circulating pipe which forms a circulating loop and is used for buffering axial force is arranged between the pump body and the right connecting end cover, the right end portion of the motor shaft is provided with a T-shaped groove which is provided with a T-shaped cross section structure and enables the circulating pipe to be communicated with the shell cavity, the left end portion of the motor shaft is provided with an I-shaped cross section structure which is provided with an I-shaped cross section structure and enables the shell cavity to be communicated with the interior of the pump body, and the arrangement of the structure can balance the axial force of the rotor to a greater degree, prevent the motor shaft from being damaged, and prolong the service life of the whole motor shaft.

Drawings

Fig. 1 is a schematic sectional view of the circulation type canned motor pump.

In the figure, 1, a water outlet; 2. an impeller unit; 3. a pump body; 4. a motor shaft; 6. The left connecting end cover; 7. the right connecting end cover; 8. a housing; 9. a shell cavity; 10. a circulation pipe; 11. mounting holes; 12. a convex ring part; 13. a T-shaped groove; 14. i-shaped grooves; 15. a gasket; 16. a boss portion; 17. a first annular groove; 18. a buffer lane; 19. a second annular groove; 20. and a flow blocking ring.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in figure 1, the circulating type shielding pump comprises a pump body with a water inlet, a water outlet and an impeller unit, and a motor main body which is connected with the pump body and is provided with a motor shaft, wherein the motor shaft is movably connected with a motor through a bearing, the motor shaft extends into the pump body, the impeller unit is arranged on the motor shaft, the motor main body consists of a machine shell and a stator component, the machine shell consists of a left connecting end cover, a right connecting end cover and a shell which are connected with the pump body, the left connecting end cover, the right connecting end cover, the shell and the shell are matched with the bearing to form a shell cavity for mounting the stator component, a circulating pipe which forms a circulating loop and is used for buffering axial force is arranged between the pump body and the right connecting end cover, one end of the circulating pipe is connected with the water outlet in the pump body, the other end of the circulating pipe is connected with the center of the right end face of the right connecting end cover, and the pump body and the right connecting end cover are provided with a safety pipe which is used for mounting the circulating pipe and enables the water outlet of the pump body to be communicated with the interior of the motor main body The end surface of the pump body at the joint of the pump body and the left connecting end cover is provided with a mounting hole for the left connecting end cover to extend into, the left end of the left connecting end cover at the mounting hole is provided with a convex ring part which axially protrudes outwards and extends into the pump body, a gap is left between the inner peripheral walls of the convex ring part and the left connecting end cover and the outer peripheral wall of the corresponding motor shaft, a T-shaped groove which is arranged with a T-shaped cross section and enables the circulating pipe to be communicated with the shell cavity is arranged at the right end part of the motor shaft, an I-shaped groove which is arranged with an I-shaped cross section and enables the shell cavity to be communicated with the inside of the pump body is arranged at the left end part of the motor shaft, the bearings are respectively arranged on the groove bodies of the motor shaft positioned in the T-shaped groove and the I-shaped groove, the outer peripheral wall of the motor shaft positioned in the I-shaped groove is provided with a flow blocking ring which is protruded outwards in the radial direction, the flow blocking ring is positioned in the shell cavity, and the left end surface of the motor shaft is provided with a forming groove which is axially inwards sunken, communicated with the I-shaped groove and convenient for forming the I-shaped groove.

In a further elaboration, in order to facilitate the disassembly, the sealing performance of the joint is ensured simultaneously, the pump body is fixedly connected with the left connecting end cover through a plurality of studs, and a sealing gasket for strengthening the sealing performance is arranged between the pump body and the left connecting end cover.

In a detailed description, in order to balance the axial force at the impeller unit, the impeller unit is a rotary impeller, a boss which is axially outwards protruded and extends to be embedded into the boss is arranged on the rear end face of the rotary impeller, a first annular groove which is arranged on the left end face of the boss and provided with a right protrusion is arranged on the left end face of the boss, a gap is reserved between the inner wall of the first annular groove and the outer peripheral wall of the corresponding boss, a plurality of buffer channels which are arranged along the circumferential direction of the first annular groove and are used for buffering a circulation loop are arranged on the boss, the buffer channels are obliquely arranged, the inner portion and the outer portion of the boss are communicated through the buffer channels, a second annular groove is arranged on the outer edge of the left end face of the boss, and the second annular groove extends to the buffer channel and is communicated with the buffer channels.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (5)

1. A circulating canned motor pump comprises a pump body (3) with a water inlet, a water outlet (1) and an impeller unit (2), and a motor main body which is connected with the pump body (3) and is provided with a motor shaft (4), wherein the motor shaft (4) is connected with the motor through a bearing, the impeller unit (2) is arranged on the motor shaft (4), the motor main body consists of a machine shell and a stator-rotor assembly, the machine shell consists of a left connecting end cover (6), a right connecting end cover (7) and a shell body (8), the left connecting end cover (6), the right connecting end cover (7) and the shell body (8) are matched with the bearing to form a shell cavity (9) for mounting the stator-rotor assembly, and the canned motor pump is characterized in that a circulating pipe (10) which forms a circulating loop and is used for buffering axial force is arranged between the pump body (3) and the right connecting end cover (7), one end of the circulating pipe (10) is connected with the water outlet (1) in the pump body (3), the other end of the circulating pipe (10) is connected with the right end face of the right connecting end cover (7), the end face of the pump body (3) at the joint with the left connecting end cover (6) is provided with a convex ring part (12) for the left connecting end cover (6) to extend into the mounting hole (11), the left end of the left connecting end cover (6) at the mounting hole (11) is provided with a convex ring part (12) which axially protrudes outwards and extends into the pump body (3), a gap is reserved between the convex ring part (12) and the motor shaft (4), the right end part of the motor shaft (4) is provided with a T-shaped groove (13) which is provided with a cross-section T-shaped structure and enables the circulating pipe (10) to be communicated with the shell cavity (9), and the left end part of the motor shaft (4) is provided with an I-shaped groove (14) which is provided with a cross section I-shaped structure and enables the shell cavity (9) to be communicated with the interior of the pump body (3).

2. A circulating canned pump according to claim 1, characterized in that, the pump body (3) and the left connection end cap (6) are fixedly connected through a plurality of studs, and a gasket (15) for enhancing the sealing property is arranged between the pump body (3) and the left connection end cap (6).

3. A circulating type canned motor pump according to claim 1, wherein the impeller unit (2) is a rotary impeller, a protruding portion (16) protruding outward in the axial direction and extending into the protruding ring portion (12) is provided on a rear end surface of the rotary impeller, a first annular groove (17) for mounting the protruding portion (16) is provided on a left end surface of the protruding ring portion (12) at the protruding portion (16), and a gap is left between an inner wall of the first annular groove (17) and an outer peripheral wall of the protruding portion (16).

4. A circulating type canned motor pump according to claim 1, wherein the protruding ring portion (12) is provided with a plurality of buffer channels (18) which are arranged along a circumferential direction of the protruding ring portion and are used for buffering a circulation loop, the plurality of buffer channels (18) are all arranged in an inclined manner, the inside and the outside of the protruding ring portion (12) are communicated through the buffer channels (18), the outer edge of the protruding ring portion (12) on the end surface at the left end is provided with a second annular groove (19), and the second annular groove (19) extends to the buffer channels (18) and is communicated with the buffer channels (18).

5. A circulating type canned pump according to claim 1, characterized in that the outer peripheral wall of the motor shaft (4) at the position of the I-shaped groove (14) is provided with a right-hand radially outwardly protruding baffle ring (20).

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