CN211116616U - A multi-stage series mud type canned pump - Google Patents

Abstract

A multi-stage tandem mud-type canned pump, belonging to the technical field of canned pumps, the canned pump includes a suction port, a discharge port, a metering pump inlet, a heat exchanger, a circulation pipe, an impeller, an auxiliary impeller, etc. The two ends are respectively provided with a first sliding bearing assembly and a second sliding bearing assembly, the end face of the second sliding bearing assembly facing the motor is provided with an auxiliary impeller, and the upper end of the front bearing body is provided with a first radial hole, The lower end is provided with the second radial hole, the upper end of the rear bearing body is provided with the third radial hole, the lower end is provided with the fourth radial hole, and the other end of the second circulation pipe (the other end is connected with the outlet of the heat exchanger. The medium does not contact the sliding bearing and the motor area at all, so as to avoid wear and blockage of the sliding bearing and scratches on the stator shielding sleeve, and cool and lubricate the sliding bearing assembly.

Description

A multi-stage series mud type canned pump

technical field

The utility model belongs to the technical field of canned pumps, in particular to a multi-stage series-connected mud-type canned pump.

Background technique

Leak-free centrifugal pumps can be divided into magnetic drive centrifugal pumps and canned pumps. They have only static seals and no dynamic seals in structure, so they can ensure that a drop of liquid is not leaked. It is suitable for conveying corrosive, flammable, explosive, highly toxic, radioactive and extremely valuable liquids; at the same time, it is also suitable for conveying liquids such as high pressure, high temperature, low temperature and high melting point. With the continuous improvement of environmental protection requirements, canned pumps are widely used in national defense, chemical, petroleum and other departments.

Multi-stage canned pumps are suitable for high-lift conditions, but generally multi-stage canned pumps can only achieve 7 levels and cannot meet higher-lift conditions. Because as the number of impeller stages increases, the longer the pump cantilever is, the greater the radial force on the pump bearing. For a rotating shaft, the radial force is an alternating load that will cause the shaft to fail due to fatigue and increase the risk of fatigue fracture of the pump shaft. The magnitude of the radial force directly affects the stability of the pump shaft. Excessive radial force will cause vibration, loud noise, and rapid bearing wear during the operation of the pump, which will seriously affect the service life of the pump.

When conveying non-clean media such as flocculent and granular media with particle diameter between 0.01mm-2mm, ordinary canned pump cannot meet the conveying requirements. Leakage occurs because the particulate medium will scratch the pump body, impeller and even the stator shielding sleeve. The medium particles are easy to block the silicon carbide sliding bearing, which affects its self-lubricating property, or wears the sliding bearing due to the hard particles and causes its damage. In addition, the medium particles are also easy to block the circulation passage and affect the circulation flow of the motor, thereby causing the motor to heat up and other undesirable conditions.

Utility model content

In order to solve the above-mentioned technical problems, the utility model proposes a multi-stage series-type mud-type canned pump, which can achieve up to 12 stages at most, which is used to deal with the working conditions of higher head and the multi-stage series-type canned pump The design has high efficiency at small flow and high head. On this basis, components such as metering pumps and heat exchangers are added to achieve complete non-contact between the particle medium and the sliding bearing and motor area, so as to avoid the wear and blockage of the sliding bearing, and the scratches of the stator shielding sleeve. Cooling and lubrication.

The utility model adopts the following technical solutions:

A multi-stage tandem mud-type canned pump comprising a suction port, a discharge port, a metering pump inlet, a heat exchanger, a first circulation pipe, a second circulation pipe, a third circulation pipe, an impeller, and a front bearing body , auxiliary impeller, rear bearing body, first sliding bearing assembly, second sliding bearing assembly, pump shaft, motor, from the suction port to the discharge port direction are the first chamber, the second chamber, the third chamber, the first chamber Four chambers and a fifth chamber, the two ends of the pump shaft are respectively provided with a first sliding bearing assembly and a second sliding bearing assembly, and an auxiliary impeller is provided on the end face of the second sliding bearing assembly facing the motor, The upper end of the front bearing body is provided with a first radial hole, and the lower end is provided with a second radial hole. The second chamber and the first circulation pipe are connected through the first hole, and the first chamber and the third circulation pipe are connected through the second The other end of the first circulation pipe is connected to the inlet of the heat exchanger, the upper end of the rear bearing body is provided with a third radial hole, the lower end is provided with a fourth radial hole, and the second circulation pipe is connected to the fourth chamber. The fifth chamber is communicated with the third circulation pipe through the fourth hole, and the other end of the second circulation pipe is connected with the outlet of the heat exchanger.

Further, the first sliding bearing assembly is matched with the front bearing body, and the second sliding bearing assembly is matched with the rear bearing body.

Further, the auxiliary impeller is placed between the first sliding bearing assembly and the second sliding bearing assembly, and abuts against the left end surface of the second sliding bearing assembly.

Further, the third circulation pipe communicates with the first chamber and the fifth chamber, the first circulation pipe communicates with the second chamber and the heat exchanger, and the second circulation pipe communicates with the fourth chamber and the heat exchange device.

Further, the canned pump has twelve-stage impellers, and six impellers are respectively arranged on the left end and the right end of the pump shaft.

The so-called multi-stage tandem design is to evenly distribute 12-stage impellers on both ends of the shaft to make the radial load distribution more uniform and enhance the bearing capacity of the bearing. The utility model reduces the three to four sets of sliding bearing assemblies required by the previous unilateral 12-stage impeller to two sets, which not only reduces the difficulty of coaxiality of multiple sliding bearings, but also reduces the cost. In addition, the metering pump and heat exchanger and other components are added, and the pump is divided into two different independent cycles by the supply pressure of the metering pump.

The advantages and effects of the utility model are:

(1) The general multi-stage canned pump can only achieve 7 levels, but the utility model can achieve 12 levels, which is suitable for higher lift working conditions.

(2) The utility model reduces the three to four sets of sliding bearing assemblies required by the previous unilateral 12-stage impeller to two sets, which not only reduces the difficulty of coaxiality of multiple sliding bearings, but also reduces the cost.

Description of drawings

FIG. 1 is a schematic structural diagram of a multi-stage series-connected mud-type canned pump of the present invention.

Components in the figure: 1 is the suction port, 2 is the discharge port, 3 is the metering pump inlet, 4 is the heat exchanger, 5 is the first circulation pipe, 6 is the second circulation pipe, 7 is the third circulation pipe, 8 is the impeller , 9 is the front bearing body, 10 is the auxiliary impeller, 11 is the rear bearing body, 12 is the first sliding bearing assembly, 13 is the second sliding bearing assembly, 14 is the pump shaft, 15 is the first chamber, 16 is the second Chamber, 17 is the third chamber, 18 is the fourth chamber, 19 is the fifth chamber, 20 is the first hole, 21 is the second hole, 22 is the third hole, 23 is the fourth hole, 24 is the Motor gap.

Detailed ways

The new product will be described in detail below with reference to the accompanying drawings.

The first sliding bearing assembly 12 and the second sliding bearing assembly 13 are respectively placed on both ends of the pump shaft 14 of the shaft. The first sliding bearing assembly 12 is matched with the front bearing body 9 , and the second sliding bearing assembly 13 is matched with the rear bearing body 11 . Matchingly, the structure of the sliding bearing assembly is the prior art. The auxiliary impeller 10 is placed between the first sliding bearing assembly 12 and the second sliding bearing assembly 13 and abuts against the left end surface of the second sliding bearing assembly 13 . The upper end of the front bearing body 9 is provided with a first radial hole 20, and the lower end is provided with a second radial hole 21. The first hole 20 communicates with the second chamber 16 and the first circulation pipe 5, and the second hole 21 communicates with the first chamber The chamber 15 is connected with the third circulation pipe 7 and the other end of the first circulation pipe 5 is connected with the inlet of the heat exchanger 4 . The upper end of the rear bearing body 11 is provided with a third radial hole 22, and the lower end is provided with a fourth radial hole 23. The third hole 22 communicates with the second circulation pipe 6 and the fourth chamber 18, and the fourth hole 23 communicates with the fifth chamber The chamber 19 is connected with the third circulation pipe 7 and the other end of the second circulation pipe 6 is connected with the outlet of the heat exchanger 4 .

In the 12-stage impeller of the present invention, every six impellers are respectively distributed on the left end and the right end of the pump shaft 14 . The pump has two circulation paths under the pressure of the metering pump. Main circulation passage: The particle-containing medium enters the pump through the suction port 1, is pressurized by the six impellers at the left end, enters the third circulation pipe 7 through the second hole 21, passes through the fourth hole 23, and is then pressurized by the six impellers at the right end. Outflow from spit port 2. Second circulation passage: In order to ensure that the particulate medium does not enter the first sliding bearing assembly 12, the second sliding bearing assembly 13 and the motor gap 24 to cause blockage and wear, a metering pump needs to be pressurized. The metering pump enters the cleaning medium, the cleaning medium enters the second circulation pipe 6 of the outlet nozzle of the heat exchanger 4 through the metering pump inlet 3, and then enters the fourth chamber 18 through the third hole 22, and the cleaning medium in this chamber is in the second circulation pipe 6. A part enters the fifth chamber 19 through the gap of the second sliding bearing assembly 13 to merge with the particulate medium, and ensures that the particulate medium entering through the fourth hole 23 will not enter the second sliding bearing assembly 13 and cause blockage. Another part of the cleaning medium is re-pressurized through the auxiliary impeller 10, enters the third chamber 17, and enters the second chamber 16 through the motor gap 24, and most of the cleaning medium in this part enters the heat exchanger 4 through the first hole 20. The first circulation pipe 5 of the inlet pipeline enters the heat exchanger 4 for heat exchange. A small part of the cleaning medium enters the first chamber 15 through the gap of the first sliding bearing assembly 12 to merge with the particulate medium, and ensures that the particulate medium in the first chamber 15 does not enter the first sliding bearing assembly 12 . The cleaning medium for heat exchange lubricates and cools the two sliding bearing assemblies, and reduces the temperature of the motor assembly so that it does not burn out due to excessive temperature.

Claims (5)

1. A multi-stage tandem mud-type canned pump, characterized in that the canned pump comprises a suction port (1), a discharge port (2), a metering pump inlet (3), a heat exchanger (4), a first Circulation pipe (5), second circulation pipe (6), third circulation pipe (7), impeller (8), front bearing body (9), auxiliary impeller (10), rear bearing body (11), first sliding The bearing assembly (12), the second sliding bearing assembly (13), the pump shaft (14), and the motor, from the suction port (1) to the discharge port (2), are the first chamber (15) and the second chamber in order (16), a third chamber (17), a fourth chamber (18), and a fifth chamber (19), the two ends of the pump shaft (14) are respectively provided with first sliding bearing assemblies (12), A second sliding bearing assembly (13), the end face of the second sliding bearing assembly (13) facing the motor is provided with an auxiliary impeller (10), and the upper end of the front bearing body (9) is provided with a radial hole first hole (20), the lower end is provided with a second radial hole (21), the second chamber (16) is communicated with the first circulation pipe (5) through the first hole (20), and the first chamber (15) is connected to the third The circulation pipe (7) is communicated through the second hole (21), the other end of the first circulation pipe (5) is connected with the inlet of the heat exchanger (4), and the upper end of the rear bearing body (11) is provided with a third radial hole The hole (22) and the fourth hole (23) of the radial hole are opened at the lower end, the second circulation pipe (6) is communicated with the fourth chamber (18) through the third hole (22), and the fifth chamber (19) is connected with the fourth chamber (18). The third circulation pipe (7) is communicated through the fourth hole (23), and the other end of the second circulation pipe (6) is connected with the outlet of the heat exchanger (4). 2. The multi-stage tandem mud-type canned pump according to claim 1, characterized in that the first sliding bearing assembly (12) is matched with the front bearing body (9), and the second sliding bearing The assembly (13) is matched with the rear bearing body (11). 3. A multi-stage tandem mud-type canned pump according to claim 1, characterized in that the auxiliary impeller (10) is placed in the first sliding bearing assembly (12) and the second sliding bearing assembly (13) between and abuts against the left end face of the second sliding bearing assembly (13). 4. The multi-stage serial mud-type canned pump according to claim 1, wherein the third circulation pipe (7) communicates with the first chamber (15) and the fifth chamber (19), The first circulation pipe (5) communicates with the second chamber (16) and the heat exchanger (4), and the second circulation pipe (6) communicates with the fourth chamber (18) and the heat exchanger (4). 5 . The multi-stage tandem mud-type canned pump according to claim 1 , wherein the canned pump has twelve-stage impellers, and six impellers are respectively arranged on the left and right ends of the pump shaft (14). 6 .

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