External circulation structure of canned motor pump

Abstract

The utility model discloses an external circulation structure of a shielding electric pump, which comprises a circulation pipe, the circulation pipe comprises a pipe I and a pipe II, the pipe I is communicated with an outlet of a pump body, the pipe II is communicated with a motor cavity, and the pipe I and the pipe II are communicated through a flow divider. The utility model has the characteristics that the structure is simple, the installation is convenient, gas in a medium is separated by arranging the flow divider, the gas is prevented from entering the motor cavity along the circulating pipe to cause adverse effects on motor cooling and bearing lubrication, the influence of the gas contained in the medium on the pump is effectively reduced, and the service life of the pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electric pumps, in particular to an external circulation structure of a canned motor pump. Background Art

[0002] The structure of a conventional external circulation canned motor pump is as Figure 1 shown. The medium enters the pump cavity from the pump inlet and flows towards the pump outlet under the action of the impeller. A part of the medium will flow through the rear bearing and the front bearing via the circulation pipe and then return to the pump outlet. The function of this part of the medium is to cool the motor and lubricate the bearings.

[0003] Due to the simple circulation structure and the need to cool the motor and lubricate the bearings, only a very small amount of gas or no gas is allowed in the medium. If the gas content in the medium is relatively high, the gas will enter the motor cavity along with the medium through the circulation pipe, resulting in poor motor cooling and poor bearing lubrication, and may damage the motor and bearings. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the above-mentioned problems and provide an external circulation structure of a canned motor pump.

[0005] The technical solution adopted by the utility model to achieve the above purpose is:

[0006] An external circulation structure of a canned motor pump includes a circulation pipe, and the circulation pipe includes pipe one and pipe two. Pipe one is communicated with the pump body outlet, pipe two is communicated with the motor cavity, and pipe one and pipe two are communicated through a shunt.

[0007] The shunt includes a housing. An exhaust valve is communicated with the upper end of the housing. Pipe one is communicated with the upper part of one side of the housing, and pipe two is communicated with the lower part of the other side of the housing.

[0008] A flow stabilizer plate is arranged in the housing. Air holes are formed in the flow stabilizer plate. The flow stabilizer plate includes flow stabilizer plate one and flow stabilizer plate two. Flow stabilizer plate one and flow stabilizer plate two are arranged in a staggered manner up and down. Flow stabilizer plate one is located above flow stabilizer plate two, and there is a gap between them. One end of flow stabilizer plate one is installed on the side of the housing where pipe one is located and is lower than the connection part of pipe one and the housing. One end of flow stabilizer plate two is installed on the side of the housing where pipe two is located and is higher than the connection part of pipe two and the housing.

[0009] The housing includes a hollow pipe body. A cover plate one and a cover plate two are respectively installed on both sides of the pipe body. Pipe one is communicated with the upper part of cover plate one, and pipe two is communicated with the lower part of cover plate two.

[0010] Pipe one is communicated with the pump outlet through a union joint one, and pipe two is communicated with the motor cavity through a union joint two.

[0011] The inner diameter of the first pipe is larger than that of the second pipe.

[0012] The first pipe is inclined downward horizontally by 1° - 2°.

[0013] The characteristics of the present utility model are: simple structure, convenient installation. By setting a shunt, the gas in the medium is separated, preventing the gas from entering the motor cavity along the circulation pipe and having an adverse effect on motor cooling and bearing lubrication, effectively reducing the influence of gas in the medium on the pump, and prolonging the service life of the pump. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the external circulation structure of an existing canned motor pump.

[0015] Figure 2 It is a schematic diagram of the structure of the present utility model.

[0016] Figure 3 It is a schematic diagram of the structure of the shunt of the present utility model.

[0017] Figure 4 is Figure 3 side view of

[0018] Figure 5 It is a schematic diagram of the structure of the flow stabilizer plate of the present utility model.

[0019] Wherein: 1. First pipe 11. Union joint 2. Second pipe 21. Second union joint 3. Shunt 31. Pipe body 32. First cover plate 33. Second cover plate 34. Exhaust valve 35. Pipe joint 36. First flow stabilizer plate 37. Second flow stabilizer plate 38. Air hole. Detailed Embodiment

[0020] As Figure 2-5 shown, the present utility model is an external circulation structure of a canned motor pump, including a circulation pipe. The circulation pipe includes a first pipe 1 and a second pipe 2. The first pipe 1 and the second pipe 2 are used for medium circulation. The first pipe 1 is connected to the pump outlet through a union joint 11, and the second pipe 2 is connected to the motor cavity through a second union joint 21. By adopting the union joint structure, the connection of the circulation pipe is convenient. The first pipe 1 and the second pipe 2 are connected through a shunt 3. The shunt 3 is used to separate the gas in the medium. The inner diameter of the first pipe 1 is larger than that of the second pipe 2. The first pipe 1 is inclined downward horizontally by 1° - 2°. Through the setting of the pipe diameter and the inclination angle, the liquid inlet circulation and exhaust of the medium are facilitated.

[0021] The shunt 3 includes a housing which includes a hollow tube body 31. On both sides of the tube body 31, a first cover plate 32 and a second cover plate 33 are respectively installed. The first tube 1 communicates with the upper part of the first cover plate 32, and the second tube 2 communicates with the lower part of the second cover plate 33. The upper end of the tube body 31 is communicated with an exhaust valve 34 through a pipe joint 35. A flow stabilizer plate is arranged inside the housing. A plurality of air holes 38 are formed in the flow stabilizer plate. The flow stabilizer plate includes a first flow stabilizer plate 36 and a second flow stabilizer plate 37. The first flow stabilizer plate 36 and the second flow stabilizer plate 37 are arranged in a staggered manner up and down. The first flow stabilizer plate 36 is located above the second flow stabilizer plate 37, and there is a gap between them. One end of the first flow stabilizer plate 36 is installed on the first cover plate 32 and is lower than the connection part of the first tube 1 and the first cover plate 32. One end of the second flow stabilizer plate 37 is installed on the second cover plate 33 and is higher than the connection part of the second tube 2 and the second cover plate 33. By arranging the flow stabilizer plate, the circulation distance of the medium in the shunt 3 is increased, which is convenient for the gas in the medium to be discharged.

[0022] During use, the medium flows from the pump outlet into the first tube 1 and then enters the shunt 3. Since the density of the gas is lower than that of the medium, the gas will concentrate in the upper layer of the shunt 3. The gas in the lower layer will also flow to the upper layer of the shunt 3 through the air holes 38 on the flow stabilizer plate. Finally, the gas flows from the first tube 1 to the pump outlet or flows out through the exhaust valve. The medium enters the second tube 2 after passing through an S-shaped route under the action of the flow stabilizer plate in the shunt 3, and then enters the motor cavity through the second tube 2, thus completing the external circulation of the canned motor pump.

[0023] The utility model separates the gas in the medium by arranging the shunt 3, avoids the gas entering the motor cavity along the circulation pipe and causing adverse effects on the motor cooling and bearing lubrication, effectively reduces the influence of the gas contained in the medium on the pump, and prolongs the service life of the pump.

[0024] When using the canned motor pump of the utility model, the medium is allowed to contain gas, but the gas content needs to be less than 5%. If the gas content is too high, it will have an impact on the pump.

[0025] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the utility model and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the utility model.

Claims

1. An external circulation structure of a canned motor pump, comprising a circulation pipe, characterized in that: The circulation pipe includes pipe 1 and pipe 2, wherein pipe 1 is connected to the pump body outlet, pipe 2 is connected to the motor cavity, pipe 1 and pipe 2 are connected through a flow divider, the flow divider includes a shell, an upper end of the shell is connected to an exhaust valve, pipe 1 is connected to the upper part of one side of the shell, pipe 2 is connected to the lower part of the other side of the shell, a flow stabilizer is arranged in the shell, air holes are opened on the flow stabilizer, the flow stabilizer includes flow stabilizer 1 and flow stabilizer 2, the flow stabilizer 1 and flow stabilizer 2 are arranged alternately up and down, flow stabilizer 1 is located above flow stabilizer 2, and a gap is left between the two, one end of the flow stabilizer 1 is installed on the side of the shell located at pipe 1 and lower than the connection between pipe 1 and the shell, and one end of the flow stabilizer 2 is installed on the side of the shell located at pipe 2 and higher than the connection between pipe 2 and the shell.

2. The external circulation structure of a canned motor pump according to claim 1, characterized in that: The shell comprises a hollow tube body, and a cover plate 1 and a cover plate 2 are respectively installed on both sides of the tube body. The tube 1 is communicated with the upper part of the cover plate 1, and the tube 2 is communicated with the lower part of the cover plate 2.

3. The external circulation structure of a canned motor pump according to claim 1, characterized in that: The first pipe is connected to the pump outlet through the first union joint, and the second pipe is connected to the motor cavity through the second union joint.

4. The external circulation structure of a canned motor pump according to claim 1, characterized in that: The inner diameter of the first tube is greater than the inner diameter of the second tube.

5. The external circulation structure of a canned motor pump according to claim 1, characterized in that: The tube is tilted downward by 1°-2° from a horizontal position.

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