A low-noise intelligent multi-stage pump

Abstract

The utility model relates to a low-noise intelligent multi-stage pump, which relates to the technical field of fluid transportation, and comprises a pump body, a cylinder, a motor, a shell, a frequency conversion unit, a control unit, a fan, a heat sink and an isolation plate. The upper end of the cylinder is connected to the motor through a bracket, and the lower end of the cylinder is connected to the pump body. An inlet and an outlet are provided on the pump body, and the output end of the motor is connected to the pump shaft through a coupling. A plurality of impellers and guide bodies assembled on the pump shaft are arranged inside the cylinder; the motor is provided with a control unit connected to the frequency conversion unit; an annular sound-absorbing cotton is arranged on the inner wall of the shell; a fan is arranged on the top of the motor shaft of the motor, and the fan is a unidirectional vortex structure. The low-noise unidirectional vortex fan design, the silencer cotton and the shell closed structure can effectively reduce the noise of the multi-stage pump and reduce the impact of the noise on the lives of residents.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid transportation, in particular to a low-noise intelligent multi-stage pump. Background Art

[0002] Multistage pumps are widely used in mid-stream pressurization and secondary pressurization systems in buildings. In secondary water supply applications, fixed frequency and variable frequency constant pressure water supply modes are currently mainly used. The inverter and controller of the variable frequency water supply equipment are generally independently set in the control cabinet, which occupies a large area. For the water supply renovation of old communities, due to space limitations, it is difficult to implement and install. On the other hand, with the improvement of people's quality of life, the requirements for noise are getting higher and higher, and the noise of conventional multistage pumps can no longer meet the increasingly stringent requirements.

[0003] The technical problem to be solved by the utility model is to provide a low-noise intelligent multi-stage pump, which integrates a motor, a frequency conversion unit, and a control unit into one, saving equipment installation space. In addition, a low-noise unidirectional vortex fan design, silencer cotton and a shell closed structure are adopted to effectively reduce the noise of the multi-stage pump and reduce the impact of noise on residents' lives.

[0004] The technical solution adopted by the utility model to solve the technical problem is: to provide a low-noise intelligent multi-stage pump. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a low-noise intelligent multi-stage pump, which solves the problems raised in the above-mentioned background technology.

[0007] (II) Technical solution

[0008] To achieve the above purpose, the utility model is implemented through the following technical solutions: a low-noise intelligent multi-stage pump, characterized in that: a pump body, a cylinder, a motor, a housing, and a control unit are respectively arranged from top to bottom, a pump shaft is arranged in the cylinder, the output end of the motor is connected to the pump shaft through a coupling, a bracket is arranged on the top of the cylinder to be connected to the motor, the pump shaft extends from the inside of the bracket to the inside of the cylinder, a plurality of impellers and guide bodies assembled on the pump shaft are arranged inside the cylinder, and the number of impellers is greater than or equal to two; a frequency conversion unit connected to the control unit is arranged above the motor;

[0009] The bottom of the cylinder is provided with a pump body for fixing itself; the control unit is used to control the frequency conversion unit to drive the motor to drive the pump shaft to rotate;

[0010] An annular sound-absorbing cotton is arranged on the inner wall of the shell; a fan is arranged on the top of the motor shaft of the motor, and the fan is a one-way vortex structure.

[0011] Preferably, an isolation plate is provided in the shell to divide the shell into upper and lower chambers, the control unit and the frequency conversion unit are accommodated in the upper chamber, the motor and the fan are accommodated in the lower chamber, a heat sink is provided above the motor, and the heat sink is fixed below the isolation plate.

[0012] Preferably, the heat sink is provided with evenly distributed heat dissipation ribs, and the isolation plate and the heat sink are made of aluminum alloy with good heat dissipation performance.

[0013] Preferably, the motor is a permanent magnet motor.

[0014] Preferably, the top of the shell is covered with a top cover, and the isolation plate is fixed on the shell to form a sealed cavity with the top cover through an O-ring seal.

[0015] Preferably, the frequency conversion unit is arranged on the isolation plate, and the heat generated by the frequency conversion unit is transferred to the heat dissipation plate through the isolation plate.

[0016] Preferably, an air inlet is provided on the circumference of the shell below the isolation plate and above the upper end of the motor, and an air outlet is provided at the lower end of the shell.

[0017] (III) Beneficial effects

[0018] The utility model provides a low-noise intelligent multi-stage pump. It has the following beneficial effects:

[0019] Compared with the existing multi-stage pump water supply method, this low-noise intelligent multi-stage pump integrates the motor, frequency conversion unit and control unit into one, which greatly reduces the installation space of the water supply equipment;

[0020] Through the low-noise one-way vortex fan design, silencer cotton and shell closed structure, the multi-stage pump noise is effectively reduced, reducing the impact of noise on residents' lives;

[0021] With standardized design, one frame size covers multiple powers. By increasing the motor length (increasing the number of motor stator silicon steel sheets), motors of different powers can use the same mold, reducing investment, reducing production complexity, and improving product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of this embodiment;

[0023] Figure 2 yes Figure 2 sectional view of .

[0024] Figure 3 This is a schematic diagram of the structure of the fan of the utility model

[0025] Figure 4 This is a schematic diagram of the structure of the heat dissipation plate of the utility model

[0026] Illustration: 1. Pump body; 2. Impeller; 3. Diverter; 4. Cylinder; 5. Pump shaft; 6. Bracket; 7. Coupling; 8. Motor shaft; 9. Motor; 10. Fan; 11. Air inlet; 12. Shell; 13. Sound-absorbing cotton; 14. Heat sink; 15. Frequency conversion unit; 16. Control unit; 17. O-ring; 18. Isolation plate; 19. Top cover; 20. Air outlet. DETAILED DESCRIPTION

[0027] The utility model embodiment provides a low-noise intelligent multi-stage pump, such as Figure 1-4 As shown, a pump body 1, a cylinder body 4, a motor 9, and a control unit 16 are arranged from top to bottom, a pump shaft 5 is arranged in the cylinder body 4, an output end of the motor 9 is connected to the pump shaft 5 through a coupling 7, a bracket 6 connected to the motor 9 is arranged on the top of the cylinder body 4, the pump shaft 5 extends from the inside of the bracket 6 to the inside of the cylinder body 4, and a plurality of impellers 2 and guide bodies 3 assembled on the pump shaft 5 are arranged inside the cylinder body 4; a frequency conversion unit 15 connected to the control unit 16 is arranged above the motor 9; a pump body 1 for fixing itself is arranged at the bottom of the cylinder body 4; the control unit 16 is used to control the frequency conversion unit 15 to drive the motor 9 to drive the pump shaft 5 to rotate;

[0028] The impeller 2 is mounted on the pump shaft 5 and built into the guide body 3. The pump shaft 5 is used to drive the impeller 2 to rotate, pressurizing the liquid from the inlet through the impeller 2 and the guide body 3 and transporting the liquid through the flow channel between the guide body 3 and the cylinder 4 to the outlet.

[0029] An isolation plate 18 is arranged in the shell 12, dividing the shell 12 into an upper and lower chamber. The control unit 16 and the frequency conversion unit 15 are accommodated in the upper chamber, and the motor 9 and the fan 10 are accommodated in the lower chamber. A heat sink 14 is arranged above the motor 9, and the heat sink 14 is fixed below the isolation plate 18. In the circumferential direction of the shell 12, an air inlet 11 is arranged below the isolation plate 18 and above the upper end of the motor 9, and an air outlet 20 is arranged at the lower end of the shell 12.

[0030] The number of impellers 2 and guide bodies 3 in this embodiment is multiple (greater than or equal to 2), and they are evenly spaced and assembled on the pump shaft 5. The head of the smart pump is proportional to the number of impellers 2, and its matching power is also proportional to the number of impellers 2. Therefore, as the number of impellers 2 is different, a multi-stage pump needs to be equipped with motors 9 of multiple powers. The motor 9, the frequency conversion unit 15, the fan 10, the heat sink 14 and the control unit 16 are integrated into one and arranged in the housing 12. The output end of the motor 9 is connected to the pump shaft 5 through the coupling 7, and the pump shaft 5 extends from the inside of the bracket 6 to the inside of the cylinder 4. A frequency conversion unit 15 connected to the control unit 16 is arranged above the motor 9, a bracket 6 connected to the motor 9 is arranged on the top of the cylinder 4, and a pump body 1 for fixing itself is arranged at the bottom of the cylinder 4. On the outside of the motor 9, an annular sound-absorbing cotton 13 is arranged on the inner wall of the housing 12. At the top of the motor 9, a fan 10 is arranged on the motor shaft 8. The fan 10 is a unidirectional vortex structure. Compared with the traditional motor 9, the fan 10 needs to consider bidirectional rotation. The unidirectional vortex structure fan 10 is optimized by efficiency and noise. Since the noise generated by the fan 10 accounts for a large proportion of the noise of the motor 9, the noise of the motor 9 can be reduced, thereby reducing the noise of the intelligent multi-stage pump. A heat sink 14 is arranged above the motor 9 and fixed below the isolation plate 18. The heat sink 14 is provided with evenly distributed heat dissipation ribs. The isolation plate 18 and the heat sink 14 are made of aluminum alloy with good heat dissipation performance. The motor 9 is a permanent magnet motor 9 (relative to the traditional induction motor 9, the volume of the permanent magnet motor 9 is about 50% of the induction motor 9). It adopts a standardized design, and multiple power motors 9 share a machine frame number (1.1kW to 11kW use a 132 base, and 15kW to 37kW use a 160 base). The stator base of the motor 9 adopts the stretching process and is made of aluminum alloy, which can greatly reduce the number of molds. The 2.2-11kW two-pole asynchronous induction motor 9 is realized by five machine base numbers of 90, 100, 112, 132, and 160 (the 15kW to 37kW two-pole asynchronous induction motor 9 is realized by three machine base numbers of 160, 180, and 200). The permanent magnet motor 9 of the utility model is realized by a machine base number of 132, which greatly reduces the mold investment, which is only 1 / 5 of the conventional mold investment, and reduces the complexity of production by more than 80%. Similarly, the shell 12 adopts a stretching die, and a pair of dies is used to realize the production of the shell 12 of the 1.1-11kW motor 9. The material is cut off according to the required height, and standardized production and single product material cost optimization are realized at the same time. Further, the number of water pump brackets 6 is also reduced to 1 / 5 of the normal state (the bracket 6 and the motor 9 base are matched and connected, the motor 9 base is reduced, and the corresponding number of brackets 6 is reduced at the same time). The isolation plate 18 is fixed on the housing 12 and is sealed with the top cover 19 through the O-ring 17 to form a sealed cavity, so that the protection level of the frequency conversion unit 15 and the control unit 16 reaches IP55.

[0031] The working principle of this embodiment is as follows: the pump shaft 5 is used to drive the impeller 2 to rotate and pressurize the liquid from the inlet through the impeller 2 and the guide body 3 and transport it to the outlet through the flow channel between the guide body 3 and the cylinder 4. Pressure sensors are set at the input and output ends of the multistage pump to detect the input pressure signal P1 and the output pressure signal P2, and the input and output pressure signals are connected to the corresponding ports of the control unit 16. Given the user end flow and head requirements, the control unit 16 determines the output pressure P of the multistage pump by calculation according to the input pressure signal of the pressure sensor at the inlet end of the multistage pump. The control unit 16 transmits a signal to the frequency conversion unit 15 to drive the motor 9 to drive the pump shaft 5 to rotate. When P2 is less than P, the frequency of the frequency conversion unit 15 increases, the speed of the motor 9 increases, and the output pressure of the multistage pump increases until P2 is equal to P within the set error range. On the contrary, when P2 is greater than P, the frequency of the frequency conversion unit 15 decreases, the speed of the motor 9 decreases, and the output pressure of the multistage pump decreases until P2 is equal to P within the set error range.

[0032] The fan 10 is fixed on the motor shaft 8. When the intelligent multi-stage pump is in operation, the fan 10 rotates with the motor shaft 8. The air enters from the air inlet 11, passes through the fan 10 along the channel formed by the outer edge of the motor 9 and the housing 12, and leaves from the air outlet 20, taking away the heat generated during the operation of the motor 9 in time. The isolation plate 18 and the heat sink 14 are made of aluminum alloy with good heat dissipation performance. The heat generated by the frequency conversion unit 15 IGBT is transferred to the heat sink 14 through the isolation plate 18. The evenly distributed heat dissipation ribs set on the heat sink 14 take out the heat in time through the flowing air. The temperature of the frequency conversion unit 15 and the motor 9 is within the allowable range, ensuring the safe and stable operation of the intelligent multi-stage pump.

[0033] The low-noise implementation scheme includes: first, reducing the noise of the noise source by designing a unidirectional rotating vortex fan 10; second, further reducing the noise by using sound-absorbing cotton 13; and third, isolating by the shell 12 to block the noise propagation path and reduce the propagation of noise.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise intelligent multi-stage pump, characterized in that: A pump body (1), a cylinder (4), a motor (9), a housing (12), and a control unit (16) are arranged from top to bottom, a pump shaft (5) is arranged in the cylinder (4), an output end of the motor (9) is connected to the pump shaft (5) via a coupling (7), a bracket (6) is arranged on the top of the cylinder (4) and connected to the motor (9), the pump shaft (5) extends from the inside of the bracket (6) to the inside of the cylinder (4), a plurality of impellers (2) and guide bodies (3) mounted on the pump shaft (5) are arranged inside the cylinder (4), and the number of the impellers (2) is greater than or equal to two; a frequency conversion unit (15) connected to the control unit (16) is arranged above the motor (9); The bottom of the cylinder (4) is provided with a pump body (1) for fixing the cylinder; the control unit (16) is used to control the frequency conversion unit (15) to drive the motor (9) to drive the pump shaft (5) to rotate; An annular sound-absorbing cotton (13) is arranged on the inner wall of the shell (12); a fan (10) is arranged on the top of the motor shaft (8) of the motor (9), and the fan (10) is a one-way vortex structure.

2. The low-noise intelligent multi-stage pump according to claim 1 is characterized in that: An isolation plate (18) is arranged inside the shell (12) to divide the shell (12) into upper and lower chambers; the control unit (16) and the frequency conversion unit (15) are accommodated in the upper chamber, and the motor (9) and the fan (10) are accommodated in the lower chamber; a heat sink (14) is arranged above the motor (9), and the heat sink (14) is fixed below the isolation plate (18).

3. The low-noise intelligent multi-stage pump according to claim 2 is characterized in that: The heat dissipation plate (14) is provided with evenly distributed heat dissipation ribs, and the isolation plate (18) and the heat dissipation plate (14) are made of aluminum alloy with good heat dissipation performance.

4. The low-noise intelligent multi-stage pump according to claim 1 is characterized in that: The motor (9) is a permanent magnet motor.

5. The low-noise intelligent multi-stage pump according to claim 2 is characterized in that: The top of the shell (12) is covered with a top cover (19), and the isolation plate (18) is fixed on the shell (12) and sealed with the top cover (19) through an O-ring (17) to form a sealed cavity.

6. The low-noise intelligent multi-stage pump according to claim 2 is characterized in that: The frequency conversion unit (15) is arranged on the isolation plate (18), and the heat generated by the frequency conversion unit (15) is transferred to the heat dissipation plate (14) through the isolation plate (18).

7. The low-noise intelligent multi-stage pump according to claim 2 is characterized in that: An air inlet (11) is provided on the circumference of the shell (12), below the isolation plate (18) and above the upper end of the motor (9), and an air outlet (20) is provided at the lower end of the shell (12).

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