CN220319887U - Back vane structure for centrifugal pump - Google Patents

Abstract

The utility model relates to the technical field of fluid machinery and discloses a back vane structure for a centrifugal pump, which comprises an impeller back cover plate, wherein the front part of the impeller back cover plate is provided with a back vane main body, the inside of the back vane main body is provided with a groove body, the inside of the groove body is fixedly connected with a motor, the output end of the motor is fixedly connected with a double-head screw rod, the inside of the groove body is fixedly connected with a fixing plate at the tail end of the double-head screw rod, and the inside of the groove body is provided with an adjusting mechanism.

Description

Back vane structure for centrifugal pump

Technical Field

The utility model relates to the technical field of fluid machinery, in particular to a back vane structure for a centrifugal pump.

Background

The pump is a prime mover for increasing potential energy, pressure energy and kinetic energy of liquid, and is classified into a centrifugal pump, a mixed flow pump and an axial flow pump according to the magnitude of a specific rotation speed. The centrifugal pump has low specific rotation speed and high lift, and in order to balance the pressure difference between the fluid in the pump and the atmosphere outside the pump and prevent the liquid from leaking outwards, a sealing device called a shaft seal is required to be arranged. The back vane seal is one kind of shaft seal, and back vane is installed on the back cover board of the impeller to produce pressure during rotation and to prevent liquid from leaking from the gap of the rotating shaft.

However, the back blades are fixed with the impeller back cover plate, the structure of the back blades is not adjustable, and the back blades synchronously rotate when the impeller rotates, so that the pressure generated by the back blades is constant. The sealing effect of conventional back vanes will be very limited when the pressure at the inlet of the centrifugal pump varies, for example: when the inlet pressure of the centrifugal pump is increased, the pressure generated by the back vane is lower than the sealing pressure value, and the liquid is leaked outwards from the gap of the rotating shaft; when the inlet pressure of the centrifugal pump is reduced, the pressure generated by the back vane is higher than the sealing pressure value, and air enters the pump cavity inwards from the gap of the rotating shaft. Both liquid leakage and air ingress can lead to unstable operation of the centrifugal pump, and in severe cases, to accidents.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a back vane structure for a centrifugal pump, which has the function of adjusting the sealing pressure capability of the back vane.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a back of body blade structure for centrifugal pump, includes the impeller back shroud, the front portion of impeller back shroud is provided with back of body blade main part, the cell body has been seted up to the inside of back of body blade main part, the inside fixedly connected with motor of cell body, the output fixedly connected with double-end worm of motor, the inside of cell body is located the tail end fixedly connected with fixed plate of double-end worm, the inside of cell body is provided with adjustment mechanism, adjustment mechanism's top fixedly connected with movable plate, the inside fixedly connected with closing plate of cell body, the preformed hole that runs through has been seted up to the inside of closing plate, the inside fixedly connected with controller of cell body.

Preferably, the adjusting mechanism comprises a bearing, the bearing is fixedly connected to the inside of the groove body, a rotating piece is fixedly connected to the inside of the bearing, a screw rod is arranged in the rotating piece, a worm wheel is fixedly connected to the outside of the rotating piece, and the worm wheel is meshed with the double-ended worm.

Preferably, the groove body is provided with five corresponding to the back blade, the motor is provided with five corresponding to the groove body, and the motor rotates to drive the double-ended worm to rotate so as to drive the rotating piece to drive the screw rod to drive the moving piece to move, so that the sealing capacity of the back blade main body is adjusted.

Preferably, the double-end worm is provided with two sets of worm teeth, adjustment mechanism is provided with two sets of corresponding with the worm teeth, and one set is provided with five, sets up that two sets of adjustment mechanism can carry out restriction each other and make the lead screw can drive the movable piece and remove and two sets of adjustment mechanism also possess effectual supporting role.

Preferably, the inside of fixed plate is provided with the bearing that corresponds with double-end worm, double-end worm fixed connection is inside the bearing, and double-end worm can rotate.

Preferably, two groups of five reserved holes are arranged, and the cross sectional area of each reserved hole is correspondingly equal to that of the screw rod.

Preferably, a thread structure corresponding to the screw rod is arranged in the rotating piece.

The beneficial effects are that:

1. this a back of body blade structure for centrifugal pump opens through the remote controller that is supporting with the controller for controller control motor starts, and the motor drives the double-end worm and rotates, and the double-end worm drives two worm wheels that set up and rotates, makes the worm wheel drive the rotation piece and rotates, rotates the piece and drives the lead screw and remove, and the lead screw drives the removal piece through the preformed hole and removes, adjusts the sealing capacity of back of body blade main part.

2. This a back of body blade structure for centrifugal pump realizes the auto-lock through worm gear structure, will produce centrifugal force when the centrifugal pump uses, exists the possibility of pivot rotation, so set up double-end worm cooperation worm wheel and realize the auto-lock, move the piece position variation and lead to the centrifugal pump trouble when avoiding the centrifugal pump to use.

Drawings

FIG. 1 is a cross-sectional view of the present utility model;

FIG. 2 is a schematic diagram of the structure of the present utility model;

FIG. 3 is a schematic view of a moving sheet according to the present utility model;

FIG. 4 is a schematic view of a seal plate according to the present utility model.

In the figure: 1. an impeller back cover plate; 2. a back blade body; 3. a tank body; 4. a motor; 5. a double-ended worm; 6. a fixing plate; 7. an adjusting mechanism; 8. a bearing; 9. a rotating member; 10. a worm wheel; 11. a screw rod; 12. a sealing plate; 13. a preformed hole; 14. a moving plate; 15. and a controller.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

Referring to fig. 1-4, a back vane structure for a centrifugal pump includes an impeller back cover plate 1, a back vane main body 2 is provided at the front part of the impeller back cover plate 1, a groove body 3 is provided in the back vane main body 2, a motor 4 is fixedly connected in the groove body 3, an output end of the motor 4 is fixedly connected with a double-ended worm 5, a fixing plate 6 is fixedly connected in the groove body 3 at the tail end of the double-ended worm 5, an adjusting mechanism 7 is provided in the groove body 3, a moving plate 14 is fixedly connected at the top of the adjusting mechanism 7, a sealing plate 12 is fixedly connected in the groove body 3, a penetrating preformed hole 13 is provided in the sealing plate 12, two groups of preformed holes 13 are provided, the cross-sectional area of the preformed hole 13 is equal to the cross-sectional area of a screw 11 correspondingly, and a controller 15 is fixedly connected in the groove body 3.

Wherein, adjustment mechanism 7 includes bearing 8, and bearing 8 fixed connection is in the inside of cell body 3, and the inside fixedly connected with of bearing 8 rotates piece 9, and the inside of rotating piece 9 is provided with the helicitic texture that corresponds with lead screw 11, and the inside of rotating piece 9 is provided with lead screw 11, and the outside fixedly connected with worm wheel 10 of rotating piece 9, worm wheel 10 and double-end worm 5 meshing are connected.

The groove body 3 is provided with five corresponding to the back blades, the motor 4 is provided with five corresponding to the groove body 3, and the motor 4 rotates to drive the double-ended worm 5 to rotate so as to drive the rotating piece 9 to drive the screw rod 11 to drive the moving piece 14 to move, so that the sealing capacity of the back blade main body 2 is adjusted.

Wherein, the double-end worm 5 is provided with two sets of worm teeth, adjustment mechanism 7 is provided with two sets of corresponding with the worm teeth, and a set of being provided with five, sets up that two sets of adjustment mechanism 7 can carry out restriction each other and make lead screw 11 rotate and can drive the removal piece 14 and remove and set up that two sets of adjustment mechanism 7 also have effective supporting role, and the inside of fixed plate 6 is provided with the bearing that corresponds with the double-end worm 5, and double-end worm 5 fixed connection is inside the bearing, and double-end worm 5 can rotate.

Working principle: when the back vane structure for the centrifugal pump is used, the back vane structure is started through the remote controller matched with the controller 15, the controller 15 controls the motor 4 to start, the motor 4 starts to drive the double-ended worm 5 to rotate, the two worm gears 10 meshed with the double-ended worm 5 start to rotate, the worm gears 10 drive the rotating piece 9 to rotate, the rotating piece 9 drives the screw rod 11 to move, the screw rod 11 is connected with the moving piece 14 through the reserved hole 13, and when the screw rod 11 rotates, the moving piece 14 plays a limiting role on the screw rod 11 to prevent the screw rod 11 from rotating, so that the screw rod 11 starts to drive the moving piece 14 to move, and the sealing capacity of the back vane main body 2 is regulated.

Example two

Referring to fig. 1-4, further, in the first embodiment, a rotating member 9 is fixedly connected to the inside of the bearing 8, a screw rod 11 is disposed in the rotating member 9, a worm wheel 10 is fixedly connected to the outside of the rotating member 9, and the worm wheel 10 is engaged with the double-ended worm 5.

Working principle: when the back vane structure for the centrifugal pump is used, self-locking can be realized through the worm wheel 10 worm structure, centrifugal force is generated when the centrifugal pump is used, and the possibility of self-rotation of the structures such as the fixed rotating piece 9 and the like exists, so that the double-ended worm 5 is arranged to be matched with the worm wheel 10 to realize self-locking, and the structures such as the rotating piece 9 and the like are further limited to ensure that the structures such as the rotating piece 9 and the like can not rotate automatically, so that the centrifugal pump fault caused by the position change of the movable piece 14 when the centrifugal pump is used is avoided.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A back vane structure for a centrifugal pump, comprising an impeller back cover plate (1), characterized in that: the front portion of impeller back shroud (1) is provided with back of body blade main part (2), cell body (3) have been seted up to the inside of back of body blade main part (2), the inside fixedly connected with motor (4) of cell body (3), the output fixedly connected with double-end worm (5) of motor (4), the inside of cell body (3) is located tail end fixedly connected with fixed plate (6) of double-end worm (5), the inside of cell body (3) is provided with adjustment mechanism (7), the top fixedly connected with movable piece (14) of adjustment mechanism (7), the inside fixedly connected with closing plate (12) of cell body (3), preformed hole (13) that run through have been seted up to the inside of closing plate (12), the inside fixedly connected with controller (15) of cell body (3).

2. A back vane structure for a centrifugal pump according to claim 1, wherein: the adjusting mechanism (7) comprises a bearing (8), the bearing (8) is fixedly connected to the inside of the groove body (3), a rotating piece (9) is fixedly connected to the inside of the bearing (8), a screw rod (11) is arranged in the rotating piece (9), and a worm wheel (10) is fixedly connected to the outside of the rotating piece (9).

3. A back vane structure for a centrifugal pump according to claim 1, wherein: the groove body (3) is provided with five corresponding to the back blade, and the motor (4) is provided with five corresponding to the groove body (3).

4. A back vane structure for a centrifugal pump according to claim 1, wherein: the double-ended worm (5) is provided with two sets of worm gear teeth, the adjusting mechanism (7) is provided with two sets corresponding to the worm gear teeth, and one set is provided with five sets.

5. A back vane structure for a centrifugal pump according to claim 1, wherein: the inside of fixed plate (6) is provided with the bearing that corresponds with double-end worm (5), double-end worm (5) fixed connection is in the bearing inside.

6. A back vane structure for a centrifugal pump according to claim 2, wherein: the preformed holes (13) are provided with two groups and one group of five groups, and the cross section area of the preformed holes (13) is correspondingly equal to the cross section area of the screw rod (11).

7. A back vane structure for a centrifugal pump according to claim 2, wherein: the inside of the rotating piece (9) is provided with a thread structure corresponding to the screw rod (11).