CN216199014U

CN216199014U - Water pump capable of preventing backflow

Info

Publication number: CN216199014U
Application number: CN202122314452.5U
Authority: CN
Inventors: 陈红卫; 黄建丽; 赵国均
Original assignee: Zhejiang Fengqiu Crane Pump Industry Co ltd
Current assignee: Zhejiang Fengqiu Crane Pump Industry Co ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-04-05
Anticipated expiration: 2031-09-24

Abstract

The utility model provides a water pump of preventing backward flow, includes water pump shell, spiral case and main shaft drive's impeller, spiral case side be equipped with the outlet pipe, go out the backflow prevention mouth of pipe on the water pump shell of water piping connection, the backflow prevention mouth of pipe is connected the ball tube and goes out the water pipe chute respectively, is equipped with the floater of control play water pipe chute switching in the ball tube. The utility model adopts the floating ball structure as the one-way control device of the water outlet flow passage of the water pump, thereby preventing the water flow from flowing back.

Description

Water pump capable of preventing backflow

Technical Field

The utility model relates to the technical field of water pumps, in particular to a backflow-preventing water pump.

Background

In modern industry, a water pump is a frequently-used device for liquid delivery, and after the water pump is delivered or shut down, liquid backflow often occurs to affect the water pumping performance of the water pump, and how to prevent the liquid backflow is a subject of research by a person skilled in the art.

Chinese utility model patent No. 201921939898.3 discloses a submersible pump for preventing blocking and backflow, which comprises a pump body, the bottom of the outer surface of the pump body is equidistantly provided with a limit groove, a limit block is arranged in the limit groove, both sides of the top end of the limit block are both provided with limit screw rods, the outer surface of the limit block is welded with a limit round block, the top end of the limit round block is welded with a fender, the top end of the fender is equidistantly welded with a connecting plate, one end of the connecting plate is welded with a limit round pipe, the bottom end of the pump body is provided with a water delivery pipe, the fender can be fixed and limited by the limit groove, the limit round block, the connecting plate, the limit round pipe and the limit screw rods, the fender is prevented from falling off when in use, the flowing water range absorbed by the pump body can be limited by the fender, and the pump body is prevented from directly absorbing muddy water, the pump body is blocked when in work, and the use of the pump body is influenced. The submersible pump mainly prevents silt from being sucked, and the technical scheme adopted for water flow backflow is relatively complex.

SUMMERY OF THE UTILITY MODEL

The utility model adopts the floating ball structure to solve the backflow problem of water flow output by the water pump, and adopts the compression type mechanical sealing structure to improve the water pressure in the volute and increase the lift performance of the water pump.

In order to solve the technical problems, the technical scheme of the utility model is as follows: a water pump for preventing backflow comprises a water pump shell, a volute and a main shaft driven impeller, wherein a water outlet pipe is arranged on the side edge of the volute and is connected with a backflow preventing pipe orifice on the water pump shell, the backflow preventing pipe orifice is respectively connected with a floating ball pipe and a water outlet inclined pipe, and a floating ball for controlling the opening and closing of the water outlet inclined pipe is arranged in the floating ball pipe; the diameter of the floating ball is larger than the pipe diameter of the backflow prevention pipe orifice. When the water outlet pipe of the floating ball structure discharges water, the floating ball is jacked up by water flow to enter the floating ball pipe, the water flow flows out through the water outlet inclined pipe, when the water pump is closed, the floating ball blocks the backflow preventing pipe orifice due to gravity drop, and the water flow of the water outlet inclined pipe is prevented from flowing back into the volute.

The backflow prevention pipe orifice, the floating ball pipe and the water outlet inclined pipe are of an integrated structure, the backflow prevention pipe orifice and the floating ball pipe are of a linear structure, and the water outlet inclined pipe is of an inclined structure relative to the backflow prevention pipe orifice and the floating ball pipe. The backflow prevention pipe orifice and the floating ball pipe are of a linear structure, so that the floating ball is prevented from deviating to block the water outlet inclined pipe, and the technical fault of the water pump is avoided.

A compression type mechanical sealing structure is arranged between the main shaft and the impeller, and comprises a sealing ring sleeved with the main shaft and a compression spring; the top of the sealing ring is connected with an installation groove in the middle of the volute; the bottom of the compression spring is connected with the impeller. The compression type mechanical sealing structure generates axial sealing pressing force through the compression spring, and improves the high-pressure sealing performance inside the volute, so that the high-pressure lift of the water pump is increased.

The spiral case outside the outlet pipe is the U-shaped structure, and U-shaped structure side trompil communicates with the pressure chamber of impeller periphery, forms integrative rivers runner structure, reduces the leakage point.

The impeller center cup joint the main shaft, impeller center downside laminating connection cover is in the epaxial movable blade holder of main, the main shaft is passed through fastening screw fixed connection to movable blade holder bottom. The bottom of the volute is connected with a base, and the center of the base is in compression joint with a fixed cutter through a fixed cutter gland. The impeller, the movable cutter holder, the main shaft and the fixed cutting knife are connected closely, and are located on the same axis, so that the cutting capacity of the movable cutter on the movable cutter holder is greatly improved, and the water pump has the technical performance of a cutting pump.

The periphery of the base is provided with a flange, and the flange is fixedly connected with the volute through a first fastening screw. The bottom of the water pump shell is provided with a flange, and the flange is fixedly connected with the volute through a second fastening screw. The technical structure of centre gripping about the flange structure on base and the water pump shell forms through first fastening screw and second fastening screw, increases the holistic structure precision of water pump.

Drawings

The utility model is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic cross-sectional view of a backflow prevention water pump according to the present invention;

fig. 2 is a schematic perspective view of a water pump housing according to the present invention.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Referring to fig. 1-2, a backflow prevention water pump includes a water pump housing 1, a volute 15, and an impeller 7 driven by a main shaft 2, wherein a water outlet pipe 13 is disposed on a side of the volute 15, the water outlet pipe 13 is connected to a backflow prevention pipe orifice 20 on the water pump housing 1, the backflow prevention pipe orifice 20 is respectively connected to a floating ball pipe 11 and a water outlet pipe 12, a floating ball 14 for controlling the opening and closing of the water outlet pipe 12 is disposed in the floating ball pipe 11, a diameter of the floating ball 14 is larger than a pipe diameter of the backflow prevention pipe orifice 20, the floating ball 14 is jacked up by water flow and is located at the top of the floating ball pipe 11 during the water outlet process when the water pump is opened, and the floating ball 14 falls back to the backflow prevention pipe orifice 20 due to gravity and closes the backflow prevention pipe 12 when the water pump is closed.

In order to further improve the overall technical performance of the water pump and reduce leakage points, the backflow preventing pipe orifice 20, the floating ball pipe 11 and the water outlet inclined pipe 12 are integrated, the backflow preventing pipe orifice 20 and the floating ball pipe 11 are of a linear structure, and the water outlet inclined pipe 12 is of an inclined structure relative to the backflow preventing pipe orifice 20 and the floating ball pipe 11. The periphery of the base 16 is provided with a flange, and the flange is fixedly connected with the volute 15 through a first fastening screw 8. The bottom of the water pump shell 1 is provided with a flange, and the flange is fixedly connected with a volute 15 through a second fastening screw 5. The volute 15 outside the water outlet pipe 13 is in a U-shaped structure, and the opening of the side edge of the U-shaped structure is communicated with the pressure cavity 6 at the periphery of the impeller 7.

As the structure, a pressing type mechanical sealing structure is preferably arranged between the main shaft 2 and the impeller 7 and comprises a sealing ring 3 sleeved with the main shaft 2 and a pressing spring 4. The top of the sealing ring 3 is connected with a mounting groove in the middle of the volute 15, the bottom of the compression spring 4 is connected with the impeller 7, and the compression spring 4 is matched with the sealing ring 3 to form an axial pressure seal on the main shaft 2, so that the pressure resistance of the volute is improved, and the lift of the water pump is increased.

In order to expand the technical performance of the water pump, the main shaft 2 is sleeved in the center of the impeller 7, the lower side surface of the center of the impeller 7 is attached to and connected with the movable cutter holder 10 sleeved on the main shaft 2, and the bottom of the movable cutter holder 10 is fixedly connected with the main shaft 2 through a fastening screw 21. The base 16 is connected to the bottom of the volute 15, and the center of the base 16 is pressed and connected with the fixed cutting knife 18 through the fixed knife gland 19. The movable knife on the movable knife seat 10 cooperates with the fixed cutting knife 18 to cut impurities in water flow, so that the water pump is prevented from being blocked, and the technical performance of the cutting pump is achieved.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. A water pump for preventing backflow, comprising a water pump housing (1), a volute (15) and an impeller (7) driven by a main shaft (2), characterized in that: a water outlet pipe (13) is arranged on the side edge of the volute (15), the water outlet pipe (13) is connected with an anti-backflow pipe orifice (20) on the water pump shell (1), the anti-backflow pipe orifice (20) is respectively connected with a floating ball pipe (11) and a water outlet inclined pipe (12), and a floating ball (14) for controlling the opening and closing of the water outlet inclined pipe (12) is arranged in the floating ball pipe (11); the diameter of the floating ball (14) is larger than that of the backflow prevention pipe orifice (20).

2. The backflow prevention water pump as set forth in claim 1, wherein: the backflow prevention pipe orifice (20), the floating ball pipe (11) and the water outlet inclined pipe (12) are of an integrated structure, the backflow prevention pipe orifice (20) and the floating ball pipe (11) are of a linear structure, and the water outlet inclined pipe (12) is of an inclined structure relative to the backflow prevention pipe orifice (20) and the floating ball pipe (11).

3. The backflow prevention water pump as set forth in claim 1, wherein: a compression type mechanical sealing structure is arranged between the main shaft (2) and the impeller (7), and comprises a sealing ring (3) sleeved with the main shaft (2) and a compression spring (4); the top of the sealing ring (3) is connected with a mounting groove in the middle of the volute (15); the bottom of the compression spring (4) is connected with an impeller (7).

4. The backflow prevention water pump as set forth in claim 1, wherein: the volute (15) outside the water outlet pipe (13) is of a U-shaped structure, and the opening of the side edge of the U-shaped structure is communicated with the pressure cavity (6) on the periphery of the impeller (7).

5. The backflow prevention water pump as set forth in claim 1, wherein: the center of the impeller (7) is sleeved with the main shaft (2), the lower side surface of the center of the impeller (7) is attached to and connected with the movable cutter holder (10) sleeved on the main shaft (2), and the bottom of the movable cutter holder (10) is fixedly connected with the main shaft (2) through a fastening screw (21).

6. The backflow prevention water pump as set forth in claim 1, wherein: the bottom of the volute (15) is connected with a base (16), and the center of the base (16) is pressed and connected with a fixed cutting knife (18) through a fixed knife gland (19).

7. The backflow prevention water pump as claimed in claim 6, wherein: the base (16) periphery be equipped with the turn-ups, pass through first fastening screw (8) fastening connection spiral case (15) on the turn-ups.

8. The backflow prevention water pump as set forth in claim 1, wherein: the bottom of the water pump shell (1) is provided with a flange, and the flange is fixedly connected with the volute (15) through a second fastening screw (5).