Shielding type multiphase multiphase pump

Abstract

The utility model discloses a shielding type multiphase multiphase pump which comprises a motor driving device and a pump body connected with an output shaft of the motor driving device, the motor driving device and the pump body share the same center shaft, a mechanical seal is arranged in the pump body, and a pressure container is coaxially arranged outside the motor driving device. The end, away from the motor driving device in the center axis direction, of the pump body is externally connected with a first flushing lubricating pipe, the end, away from the pump body in the center axis direction, of the motor driving device is externally connected with a second flushing lubricating pipe, and the mechanical seal is externally connected with a cooling pipe. And meanwhile, the pump body and the bearing in the motor driving device are flushed and lubricated, so that an additional cooling system can be reduced, the manufacturing and maintenance cost can be reduced, unnecessary energy consumption can be saved, and the service life of the bearing can be prolonged.

Description

Technical Field

[0001] The utility model relates to the field of multiphase mixed flow pumps, in particular to a shielded multiphase mixed flow pump. Background Art

[0002] Multiphase mixed flow technology is widely used in media environments such as high pressure, strong corrosion, strong leakage, Newtonian fluid, non-Newtonian fluid and strong radioactivity. This environment has very high requirements for the internal and external sealing of the equipment structure. Existing multiphase mixed flow pumps generally use mechanical seals to prevent leakage of the sealing medium, but an additional cooling system is required to cool it during use, and there is a serious wear problem between the dynamic ring and the static ring of the mechanical seal. Therefore, the existing mixed flow pump has high operation and maintenance costs, and poor stability and reliability. Utility Model Content

[0003] In view of the above problems, the utility model provides a shielded multiphase mixed flow pump, which has the advantages of simple structure, good sealing effect, low operation and maintenance cost, high reliability and good stability.

[0004] The technical solution of the utility model is:

[0005] A shielded multiphase mixed flow pump comprises a motor drive device using a common central axis and a pump body connected to the output shaft of the motor drive device, the pump body having a built-in mechanical seal, a pressure vessel being coaxially arranged outside the motor drive device, one end of the pump body away from the motor drive device along the central axis being externally connected to a first flushing and lubrication pipe, one end of the motor drive device away from the pump body along the central axis being externally connected to a second flushing and lubrication pipe, and the mechanical seal being externally connected to a cooling pipe.

[0006] The pump body is sequentially sleeved with a leading bearing, a mechanical seal, a pump suction chamber, an impeller, a space guide vane, and a pump discharge chamber along the axial direction of the central axis from the end away from the motor drive device to the end close to the motor drive device. The impeller and the space guide vane are externally sleeved with the pump casing, the leading bearing and the mechanical seal are externally sleeved with the end cover, the outlet of the first flushing and lubrication pipe is directly opposite to the leading bearing, the cooling and temperature reduction pipe passes through the end cover and is directly opposite to the mechanical seal, and the pump discharge chamber is connected to the outlet pipe.

[0007] The outlet pipe is communicated with the first flushing and lubricating pipe, the second flushing and lubricating pipe, and the cooling and temperature reduction pipe.

[0008] The motor drive device is sequentially sleeved with a middle guide bearing, a rotor assembly, and a rear guide bearing along the axial direction of the central shaft from one end close to the pump body to the end far from the pump body. The rotor assembly is sleeved with a rotor shielding sleeve on the outside, the rotor shielding sleeve is sleeved with a stator shielding sleeve on the outside, and the stator shielding sleeve is sleeved with a stator assembly on the outside. The outlet of the second flushing and lubrication pipe is directly opposite to the rear guide bearing.

[0009] The inner diameter of the stator shielding sleeve is greater than the maximum outer diameter of the center guide bearing, the rotor shielding sleeve, the rotor assembly, and the rear guide bearing.

[0010] Filters are arranged at the front ends of the first flushing and lubricating pipe, the second flushing and lubricating pipe, and the cooling and temperature reduction pipe.

[0011] The pipelines where the first flushing and lubricating pipe, the second flushing and lubricating pipe, and the cooling and temperature reduction pipe are located are all provided with regulating valves.

[0012] The valve core of the regulating valve is an axial triangular groove type throttle port.

[0013] A first quick connector is provided at the connection between the first flushing and lubricating pipe and the pump body, a second quick connector is provided at the connection between the second flushing and lubricating pipe and the motor drive device, and a third quick connector is provided at the connection between the cooling and temperature reduction pipe and the mechanical seal.

[0014] The beneficial effects of the utility model are:

[0015] 1. Flushing and lubrication pipes and cooling and temperature reduction pipes are set in the device to cool down the mechanical seal components in the pump body and flush and lubricate the bearings in the pump body and the electrode drive device. This can not only reduce the additional cooling system, reduce the manufacturing and maintenance costs, save unnecessary energy consumption, but also increase the service life of the bearings;

[0016] 2. The middle guide bearing and the rear guide bearing are respectively arranged at both ends of the rotor assembly of the motor drive device to ensure the stability of power transmission and reduce noise;

[0017] 3. Filters are installed on both the flushing and lubrication pipes and the cooling and temperature reduction pipes to filter out impurities in the pumping medium and ensure the reliability of flushing, lubrication and cooling and temperature reduction;

[0018] 4. Regulating valves are installed on both the flushing and lubrication pipes and the cooling and temperature reduction pipes to adjust the flow rate of the pumping medium entering the device according to the needs of flushing and lubrication and cooling and temperature reduction;

[0019] 5. The regulating valve adopts an axial triangular groove throttle port, which has a large hydraulic radius and better stability at small flow rates. It is arranged in an annular manner, and the hydraulic radial force is also balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a shielded multiphase mixed flow pump described in an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1 is a motor drive device, 2 is a pump body, 3 is a mechanical seal, 4 is a pressure vessel, 5 is a first flushing and lubrication pipe, 6 is a second flushing and lubrication pipe, 7 is a cooling pipe, 8 is a filter, 11 is a middle guide bearing, 12 is a rotor assembly, 13 is a rear guide bearing, 14 is a rotor shielding sleeve, 15 is a stator shielding sleeve, 16 is a stator assembly, 21 is a front guide bearing, 22 is a pump suction chamber, 23 is an impeller, 24 is a space guide vane, 25 is a pump discharge chamber, 26 is a pump casing, 27 is an end cover, 28 is an outlet pipe, 51 is a first quick connector, 61 is a second quick connector, and 71 is a third quick connector. DETAILED DESCRIPTION

[0023] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0024] Example:

[0025] like Figure 1 As shown, a shielded multiphase mixed flow pump comprises a motor drive device 1 using a common central axis and a pump body 2 connected to the output shaft of the motor drive device 1, the pump body 2 has a built-in mechanical seal 3, a pressure vessel 4 is coaxially arranged outside the motor drive device 1, one end of the pump body 2 away from the motor drive device 1 along the central axis direction is externally connected to a first flushing and lubrication pipe 5, one end of the motor drive device 1 away from the pump body 2 along the central axis direction is externally connected to a second flushing and lubrication pipe 6, and the mechanical seal 3 is externally connected to a cooling pipe 7.

[0026] The working principle of the above technical solution is as follows:

[0027] The motor drive device 1 and the main body 2 share the same central axis, the pump body 2 has a built-in mechanical seal 3, and a pressure vessel 4 is arranged outside the motor drive device 1. The mechanical seal assembly in the pump body is cooled by an externally connected first flushing and lubrication pipe 5, a second flushing and lubrication pipe 6 and a cooling and cooling pipe 7, and the bearings in the pump body and the motor drive device are flushed and lubricated at the same time, which can not only reduce the additional cooling system, reduce the manufacturing and maintenance costs, save unnecessary energy consumption, but also increase the service life of the bearings.

[0028] The pump body 2 is sleeved with a leading bearing 21, a mechanical seal 3, a pump suction chamber 22, an impeller 23, a space guide vane 24, and a pump pressure chamber 25 in sequence along the axial direction of the central axis from the end far away from the motor drive device 1 to the end close to the motor drive device 1. The impeller 23 and the space guide vane 24 are sleeved with a pump casing 26 on the outside, and the leading bearing 21 and the mechanical seal 3 are sleeved with an end cover 27 on the outside. The outlet of the first flushing and lubrication pipe 5 is directly opposite to the leading bearing 21, the cooling and temperature reduction pipe 7 passes through the end cover 27 and is directly opposite to the mechanical seal 3, and the pump pressure chamber 25 is connected to the outlet pipe 28. The structural layout is simple and the spatial layout is small, which can ensure the stability and reliability of the mixed pump.

[0029] The outlet pipe 28 is connected to the first flushing and lubricating pipe 5 , the second flushing and lubricating pipe 6 , and the cooling and temperature reduction pipe 7 .

[0030] The motor drive device 1 is sleeved with a middle guide bearing 11, a rotor assembly 12, and a rear guide bearing 13 in sequence along the axis direction of the central axis from one end close to the pump body 2 to the end far away from the pump body 2. The rotor assembly 12 is sleeved with a rotor shielding sleeve 14 on the outside, the rotor shielding sleeve 14 is sleeved with a stator shielding sleeve 15 on the outside, and the stator shielding sleeve 15 is sleeved with a stator assembly 16 on the outside. The outlet of the second flushing and lubrication pipe 6 is directly opposite to the rear guide bearing 13. The middle guide bearing 11 and the rear guide bearing 13 are respectively arranged at both ends of the rotor assembly 12 of the motor drive device 1, which can ensure the stability of power transmission and reduce noise at the same time.

[0031] The inner diameter of the stator shielding sleeve 15 is larger than the maximum outer diameter of the middle guide bearing 11, the rotor shielding sleeve 14, the rotor assembly 12, and the rear guide bearing 13. Static sealing is used between the stator shielding sleeve 15 and the pump body 2 to prevent leakage of the sealed medium.

[0032] Filters 8 are arranged at the front ends of the first flushing and lubricating pipe 5, the second flushing and lubricating pipe 6, and the cooling and temperature reduction pipe 7, which can filter out impurities in the pumping medium and ensure the reliability of flushing, lubrication, and cooling and temperature reduction.

[0033] The first flushing and lubricating pipe 5, the second flushing and lubricating pipe 6, and the cooling and temperature reduction pipe 7 are all provided with regulating valves, which can adjust the flow rate of the pumping medium entering the device according to the needs of flushing and lubrication and cooling and temperature reduction.

[0034] The valve core of the regulating valve is an axial triangular groove throttle port with a large hydraulic radius and better stability at small flow rates. It is arranged in an annular shape, and the hydraulic radial force is also balanced.

[0035] A first quick connector 51 is provided at the connection between the first flushing and lubricating pipe 5 and the pump body 2, a second quick connector 61 is provided at the connection between the second flushing and lubricating pipe 6 and the motor drive device 1, and a third quick connector 71 is provided at the connection between the cooling and cooling pipe 7 and the mechanical seal 3. The quick connectors facilitate pipeline connection and simplify equipment maintenance.

[0036] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A shielded multiphase mixed pump, comprising a motor drive device with a central shaft and a pump body connected to the output shaft of the motor drive device, wherein the pump body has a built-in mechanical seal, characterized in that: A pressure vessel is coaxially arranged outside the motor drive device, one end of the pump body away from the motor drive device along the central axis is externally connected to a first flushing and lubrication pipe, one end of the motor drive device away from the pump body along the central axis is externally connected to a second flushing and lubrication pipe, and the mechanical seal is externally connected to a cooling pipe; The pump body is sleeved with a leading bearing, a mechanical seal, a pump suction chamber, an impeller, a space guide vane, and a pump discharge chamber in sequence along the central axis direction from the end away from the motor drive device to the end close to the motor drive device. The impeller and the space guide vane are sleeved with the pump casing on the outside, the leading bearing and the mechanical seal are sleeved with the end cover on the outside, the outlet of the first flushing and lubrication pipe is directly opposite to the leading bearing, the cooling and temperature reduction pipe passes through the end cover and directly opposite to the mechanical seal, and the pump discharge chamber is connected to the outlet pipe; The outlet pipe is communicated with the first flushing and lubricating pipe, the second flushing and lubricating pipe, and the cooling and temperature reduction pipe.

2. A shielded multiphase mixed flow pump according to claim 1, characterized in that: The motor drive device is sequentially sleeved with a middle guide bearing, a rotor assembly, and a rear guide bearing along the axial direction of the central shaft from one end close to the pump body to the end far from the pump body. The rotor assembly is sleeved with a rotor shielding sleeve on the outside, the rotor shielding sleeve is sleeved with a stator shielding sleeve on the outside, and the stator shielding sleeve is sleeved with a stator assembly on the outside. The outlet of the second flushing and lubrication pipe is directly opposite to the rear guide bearing.

3. A shielded multiphase mixed flow pump according to claim 2, characterized in that: The inner diameter of the stator shielding sleeve is greater than the maximum outer diameter of the center guide bearing, the rotor shielding sleeve, the rotor assembly, and the rear guide bearing.

4. A shielded multiphase mixed flow pump according to claim 1, characterized in that: Filters are arranged at the front ends of the first flushing and lubricating pipe, the second flushing and lubricating pipe, and the cooling and temperature reduction pipe.

5. The shielded multiphase mixed flow pump according to claim 1, characterized in that: The pipelines where the first flushing and lubricating pipe, the second flushing and lubricating pipe, and the cooling and temperature reduction pipe are located are all provided with regulating valves.

6. A shielded multiphase mixed flow pump according to claim 5, characterized in that: The valve core of the regulating valve is an axial triangular groove type throttle port.

7. The shielded multiphase mixed flow pump according to claim 1, characterized in that: A first quick connector is provided at the connection between the first flushing and lubricating pipe and the pump body, a second quick connector is provided at the connection between the second flushing and lubricating pipe and the motor drive device, and a third quick connector is provided at the connection between the cooling and temperature reduction pipe and the mechanical seal.

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