Direct connection type permanent magnet high-speed pump

Abstract

The invention relates to a direct connection type permanent magnet high-speed pump. The direct connection type permanent magnet high-speed pump comprises a water inlet and outlet section, an impeller nut, an impeller, a reverse guide vane, a shaft sleeve, a middle section, an upper shell, a permanent magnet high-speed motor and an inner plug type check valve. An inlet and outlet flange at the lower part of the water inlet and outlet section is a pipeline connecting flange and is also a mounting base of the pump, the pump is directly mounted above the pipeline through the inlet and outlet flange, the whole weight of the pump is supported by the pipeline, and an inner plug type check valve is mounted inside the water outlet pipe side of the water inlet and outlet section; the upper portion of the water inlet and outlet section is connected with the middle section, and the upper portion of the middle section is connected with the upper shell. The water inlet and outlet section, the middle section and the upper shell form a pressure-bearing boundary of the pump; the pressure-bearing boundary is provided with a volute-shaped pumping chamber and a set of independent water outlet pipes; the invention has the advantages of high operation rotating speed, low space requirement, capability of ensuring concentricity and good sealing performance.

Description

Technical Field

[0001] The invention relates to a high-speed pump, in particular to a direct-connected permanent-magnet high-speed pump with high operating speed, low space requirement, concentricity assurance and good sealing performance. Background Art

[0002] At present, in some application fields such as water supply renovation of old residential areas and urban-rural integrated water supply construction, the available equipment location space and operation space are extremely limited, so traditional water supply equipment needs to be more integrated and miniaturized. The water pump unit and its electrical control equipment need to be encapsulated in a very small cabinet to save the overall installation space of the water supply equipment and facilitate on-site installation. Figure 1 As shown in the figure, 3 to 4 light-duty stamping multistage pumps of the same model are connected in parallel to increase the pressure of water supply. The single pump structure of the stamping multistage pump is as follows Figure 3 shown. Summary of the invention

[0003] In view of the above problems, the main purpose of the present invention is to provide a direct-connected permanent magnet high-speed pump with high operating speed, low space requirement, guaranteed concentricity and good sealing performance.

[0004] The present invention solves the above technical problems through the following technical solutions: a direct-connected permanent magnet high-speed pump, which includes: an inlet and outlet water section, an impeller nut, an impeller, a reverse guide vane, a shaft sleeve, an intermediate section, an upper casing, a permanent magnet high-speed motor, and an internal plug check valve.

[0005] The inlet and outlet flanges at the bottom of the inlet and outlet sections are both pipeline connection flanges and the installation base of the pump. Through the inlet and outlet flanges, the pump is directly installed above the pipeline, and the overall weight of the pump is supported by the pipeline. An internal plug check valve is installed inside the outlet pipe side of the inlet and outlet sections; the upper part of the inlet and outlet sections is connected to the middle section, and the upper part of the middle section is connected to the upper shell; the three parts of the inlet and outlet sections, the middle section, and the upper shell form the pressure-bearing boundary of the pump; the pressure-bearing boundary has a volute-shaped water pressure chamber and a set of independent outlet pipes.

[0006] A reverse guide vane is installed between the inlet and outlet water sections and the middle section, and between the middle section and the upper shell. The reverse guide vane guides the impeller outlet liquid flow into the lower-stage impeller inlet.

[0007] The permanent magnet high-speed motor is provided with an extended shaft, and several impellers are fixed on the extended shaft. As the extended shaft rotates, the medium water enters the water inlet on one side of the inlet and outlet sections, performs work through the first impeller, and then passes through the first reverse guide vane for pressure boosting and drainage, enters the second impeller in the middle section, and then flows through the second reverse guide vane for drainage to the third impeller, and then enters the volute-shaped water pressure chamber in the upper shell to continue to boost the pressure, and finally enters the other side of the inlet and outlet sections to form an independent water outlet pipe composed of the inlet and outlet sections, the middle section, and the upper shell, and is discharged after flowing through the internal plug check valve.

[0008] In a specific implementation example of the present invention, the upper part of the water inlet and outlet sections is connected to the middle section through a plum blossom flange, several bolts and two O-rings, and the upper part of the middle section is connected to the upper shell through a plum blossom flange, several bolts and two O-rings.

[0009] In a specific implementation example of the present invention, the middle section and the upper shell are designed as castings.

[0010] In a specific implementation example of the present invention, the permanent magnet high-speed motor is a permanent magnet high-speed motor with a rotation speed of 6000 rpm.

[0011] In a specific implementation example of the present invention, the inlet and outlet water sections use inlet and outlet pipes arranged in parallel in the vertical direction. The lower inlet and outlet flanges are two pairs of waist-shaped flanges, which are arranged obliquely and parallel to the inlet and outlet center lines at 60°. They are also the mounting base of the pump, and the pump is directly installed above the pipeline.

[0012] In a specific implementation example of the present invention, the rotating parts on the extended shaft of the permanent magnet high-speed motor include from bottom to top: a plurality of impellers, a plurality of sleeves and a mechanical seal; the above parts are connected in series from bottom to top.

[0013] In a specific implementation example of the present invention, the mechanical seal is a bulk rubber bellows mechanical seal, the rotating part of the mechanical seal is sleeved on the extended shaft of the permanent magnet high-speed motor through the rubber bellows, and the fixed part of the mechanical seal is installed inside the upper shell.

[0014] In a specific implementation example of the present invention, the mounting flange of the permanent magnet high-speed motor is connected to the upper flange of the upper housing through a plurality of bolts and positioning stoppers.

[0015] In a specific implementation example of the present invention, an air release valve is installed at the end of the exhaust hole at the high point of the pump chamber in the upper shell.

[0016] In a specific implementation example of the present invention, the internal plug check valve is an internal plug check valve that is directly embedded in the pump outlet pipe to integrate the pump and valve.

[0017] The positive progress of the present invention is that the direct-connected permanent magnetic high-speed pump provided by the present invention has the following advantages compared with the common technology:

[0018] 1. The present invention adopts a permanent magnet high-speed motor to increase the operating speed of the pump. Compared with the existing light-duty stamping multi-stage pump using an ordinary standard motor, the impeller specific speed range can be controlled, which not only improves the motor efficiency, but also improves the hydraulic efficiency of the pump, thereby greatly improving the overall efficiency of the pump group.

[0019] 2. After the present invention adopts a permanent magnet high-speed motor, the maximum speed of the pump can reach 6000rpm. Compared with the existing light-duty stamping multi-stage pump with a maximum speed of 2900rpm, its power density is improved. Under the same parameters, the external dimensions of the pump and motor are greatly reduced, which reduces the requirements for installation space.

[0020] 3. The present invention adopts a permanent magnet high-speed motor with an extended shaft design, and the impeller is directly installed on the extended shaft, so that the motor and pump shafts are integrated. Compared with the existing light-duty stamping multi-stage pump, the motor shaft and pump shaft are connected by a clamp-shell coupling, which can better ensure concentricity. The running vibration is small, the total height of the pump is reduced, and the disassembly and assembly are simple.

[0021] 4. The present invention adopts a cast middle section and upper shell to replace the welded stamped middle section and shell of the existing light stamping multi-stage pump. The thick casting increases the overall rigidity of the shell compared to the thin-walled plate. The volute shape of the upper shell is compared to the solution of the last-stage guide vane plus annular flow channel adopted by the light stamping multi-stage pump, which improves the hydraulic efficiency of the water pressure chamber.

[0022] 5. The present invention adopts stoppers, plum blossom-shaped flanges and bolts to position and fasten the three parts of the water inlet and outlet sections, the middle section and the upper shell step by step. Compared with the existing light-duty stamping multi-stage pump that adopts integral tie rod compression and positioning, it can ensure uniform force and accurate and reliable positioning.

[0023] 6. The inlet and outlet pipes of the pump of the present invention are arranged in parallel in a vertical direction, and the inlet and outlet flanges are designed as waist-shaped flanges, which are also the installation base of the pump. The pump can be directly installed above the pipeline. The inlet and outlet of the existing light-duty stamping multi-stage pump are arranged horizontally, using standard pipe flanges, and require a special base plate for installation. In comparison, this arrangement of the present invention greatly reduces the requirements for installation space for the pump group and the pipeline system.

[0024] 7. The pump shaft seal of the present invention adopts a mature standard rubber bellows mechanical seal, which has a simpler structure and lower cost than the containerized mechanical seal used in the existing light-duty stamping multi-stage pump.

[0025] 8. The pump outlet pipe of the present invention is equipped with an internal plug check valve, and the pump and valve are integrated. The existing light-duty stamping multi-stage pump outlet must also be equipped with a check valve. In comparison, the present invention has lower costs and requires less installation space for the pump and valve system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 for Figure 1 Bottom view (schematic diagram in direction A).

[0028] Figure 3 This is a schematic diagram of the single pump structure of a stamping multi-stage pump.

[0029] The following are the names corresponding to the labels in the present invention:

[0030] Inlet and outlet water sections 1, impeller nut 2, impeller 3, reverse guide vane 4, shaft sleeve 5, middle section 6, upper casing 7, mechanical seal 8, permanent magnet high-speed motor 9, bleed valve 10, internal plug check valve 11. DETAILED DESCRIPTION

[0031] Preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solutions of the present invention in detail.

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention, Figure 2 for Figure 1 Bottom view (A-direction schematic diagram). Figure 1 and 2 As shown, the present invention proposes a direct-connected permanent magnet high-speed pump, which includes: an inlet and outlet water section 1, an impeller nut 2, an impeller 3, a reverse guide vane 4, a shaft sleeve 5, an intermediate section 6, an upper shell 7, a mechanical seal 8, a permanent magnet high-speed motor 9, an air release valve 10, and an internal plug check valve 11.

[0033] The inlet and outlet flanges at the bottom of the inlet and outlet section 1 are both pipeline connection flanges and the installation base of the pump. Through the inlet and outlet flanges, the pump is directly installed above the pipeline, and the overall weight of the pump is supported by the pipeline. An internal plug check valve 11 is installed inside the outlet pipe side of the inlet and outlet section 1; the upper part of the inlet and outlet section 1 is connected to the middle section 6, and the upper part of the middle section 6 is connected to the upper shell 7; the three parts of the inlet and outlet section 1, the middle section 6, and the upper shell 7 form the pressure boundary of the pump; the pressure boundary has a volute-shaped water pressure chamber and a set of independent outlet pipes.

[0034] A reverse guide vane 4 is installed between the water inlet and outlet sections 1 and the middle section 6, and between the middle section 6 and the upper shell 7. The reverse guide vane 4 guides the outlet liquid flow of the impeller 3 into the inlet of the next-stage impeller.

[0035] The permanent magnet high-speed motor 9 is provided with an extended shaft, and a plurality of impellers 3 are fixed on the extended shaft. As the extended shaft rotates, the medium water passes through the water inlet on one side of the inlet and outlet section 1, performs work through the first impeller 3, and then passes through the first reverse guide vane 4 for pressure boosting and drainage, enters the second impeller 3 in the middle section 6, and then flows through the second reverse guide vane 4 for drainage to the third impeller 3, and then enters the volute-shaped water pressure chamber in the upper shell 7 to continue to increase the pressure, and finally enters the other side of the inlet and outlet section 1. An independent water outlet pipe is formed by the three parts of the inlet and outlet section 1, the middle section 6, and the upper shell 7, and is discharged after flowing through the inner plug check valve 11; an air release valve 10 is installed at the end of the high point exhaust hole of the pump chamber in the upper shell 7.

[0036] In the specific implementation process of the present invention, the upper part of the water inlet and outlet section 1 is connected to the middle section 6 through a plum blossom flange, several bolts and two O-rings, and the upper part of the middle section 6 is connected to the upper shell 7 through a plum blossom flange, several bolts and two O-rings.

[0037] The middle section 6 and the upper shell 7 of the present invention are designed as castings. Compared with the traditional thin and light stamping and welding middle section and shell, the thick casting increases the overall rigidity of the shell.

[0038] The water inlet and outlet sections 1 of the present invention use inlet and outlet pipes arranged side by side in the vertical direction. The inlet and outlet flanges at the bottom are two pairs of waist-shaped flanges, which are arranged in parallel at an angle of 60° to the inlet and outlet center lines and are also the installation base of the pump. The pump is directly installed above the pipeline. This arrangement greatly reduces the space volume requirements of the pump group.

[0039] The permanent magnet high-speed motor 9 of the present invention is a permanent magnet high-speed motor with a rotation speed of 6000 rpm.

[0040] The rotating parts on the extended shaft of the permanent magnet high-speed motor 9 include from bottom to top: an impeller nut 2, a plurality of impellers 3, a plurality of sleeves 5 and a mechanical seal 8. The above parts are connected in series from bottom to top and are fixed and locked on the extended shaft of the permanent magnet high-speed motor 9 by the impeller nut 2. The mounting flange of the permanent magnet high-speed motor 9 is connected to the upper flange of the upper housing 7 through a plurality of bolts and positioning stoppers.

[0041] The working principle of the present invention is as follows: the extended shaft of the permanent magnet high-speed motor 9 drives a plurality of impellers 3 to rotate at high speed. The medium water enters the right water inlet of the water inlet and outlet section 1, works through the first impeller 3, and then passes through the first reverse guide vane 4 to increase pressure and drain, enters the second impeller 3 in the middle section 6, and then flows through the second reverse guide vane 4 to drain to the third impeller 3, and then enters the volute-shaped water pressure chamber in the upper shell 7 to continue to increase pressure, and finally enters the left side formed by the three parts of the water inlet and outlet section 1, the middle section 6, and the upper shell 7 to form an independent water outlet pipe, and flows through the inner plug check valve 11 and then discharged.

[0042] The water inlet and outlet section 1 of the present invention guides the pumped medium to enter the impeller through the suction port, and the pump outlet is also arranged on this part. The inlet and outlet flanges at the bottom of the water inlet and outlet section are two pairs of waist-shaped flanges, which are arranged in parallel at an angle of 60 degrees to the center line of the inlet and outlet, and are also the installation base of the pump.

[0043] The impeller nut 2 of the present invention locks a plurality of impellers and shaft sleeves connected in series on the shaft.

[0044] The impeller 3 in the present invention is a key working component, which converts mechanical energy into kinetic energy and pressure energy of the medium.

[0045] The reverse guide vane 4 in the present invention collects the liquid flow at the impeller outlet, converts the velocity energy into pressure energy, and guides the liquid flow into the inlet of the next-stage impeller.

[0046] The shaft sleeve 5 in the present invention plays the role of positioning and pressing each impeller.

[0047] The middle section 6 in the present invention is a casting, a pressure-bearing housing in the middle of the pump chamber, with an independent water outlet pipe. The lower part is connected to the water inlet and outlet section 1, and the upper part is connected to the upper housing 7 through a plum blossom flange, bolts and two O-rings.

[0048] The upper shell 7 in the present invention is a casting, and the pressure-bearing shell on the upper part of the pump chamber is a final-stage water pressure chamber in the shape of a volute, which independently discharges water downwards and also serves as a motor bracket.

[0049] The mechanical seal 8 in the present invention is a rubber bellows bulk mechanical seal to prevent leakage of the pumped medium;

[0050] The permanent magnet high-speed motor 9 in the present invention is a prime mover, equipped with a low-noise fan, with a designed maximum speed of 6000rpm, with a non-standard extended shaft, can directly install several impellers, and is connected to the upper housing 7 by bolts.

[0051] The air release valve 10 of the present invention is installed on the upper housing 7 at the high point of the pump chamber. Before the pump is started, the gas in the pump chamber and the water outlet pipe is discharged to avoid dry friction of the mechanical seal.

[0052] The inner plug check valve 11 of the present invention is installed inside the water outlet pipe of the water inlet and outlet section 1 to prevent the high-pressure water in the water outlet main pipe from flowing back when the pump is stopped.

[0053] The present invention adopts a permanent magnet high-speed motor to increase the operating speed of the pump. Compared with the existing light-duty stamping multi-stage pump using an ordinary standard motor, the impeller specific speed range can be controlled, which not only improves the motor efficiency, but also improves the hydraulic efficiency of the pump, thereby greatly improving the overall efficiency of the pump group.

[0054] After the present invention adopts a permanent magnet high-speed motor, the maximum speed of the pump can reach 6000rpm. Compared with the existing light-duty stamping multi-stage pump with a maximum speed of 2900rpm, its power density is improved. Under the same parameters, the external dimensions of the pump and the motor are greatly reduced, which reduces the requirements for installation space.

[0055] The present invention adopts a permanent magnet high-speed motor with an extended shaft design, and the impeller is directly mounted on the extended shaft, so that the motor and pump shafts are integrated. Compared with the existing light-duty stamping multi-stage pump, in which the motor shaft and pump shaft are connected by a clamp-shell coupling, the concentricity can be better guaranteed. The running vibration is small, the total height of the pump is reduced, and the disassembly and assembly are simple.

[0056] The present invention adopts a cast middle section and upper shell to replace the welded stamped middle section and shell of the existing light stamping multi-stage pump. The thick casting increases the overall rigidity of the shell compared to the thin-walled plate. The volute shape of the upper shell is compared to the solution of the last-stage guide vane plus annular flow channel adopted by the light stamping multi-stage pump, which improves the hydraulic efficiency of the water pressure chamber.

[0057] The water inlet and outlet sections, the middle section and the upper shell are positioned and fastened step by step using stoppers, plum blossom-shaped flanges and bolts. Compared with the existing light-duty stamping multi-stage pumps that use integral pull rods for clamping and positioning, the invention can ensure more uniform force and more accurate and reliable positioning.

[0058] The pump inlet and outlet pipes of the present invention are arranged in parallel in a vertical direction, and the inlet and outlet flanges are designed as waist-shaped flanges, which are also the installation base of the pump. The pump can be directly installed above the pipeline. The inlet and outlet of the existing light-duty stamping multi-stage pump are arranged in a horizontal direction, using standard pipe flanges and requiring a special base plate for installation. In comparison, this arrangement of the present invention greatly reduces the requirements for installation space for the pump group and the pipeline system.

[0059] The pump shaft seal of the present invention adopts a mature and standard rubber bellows mechanical seal, which has a simpler structure and lower cost than the containerized mechanical seal adopted in the existing light-duty stamping multi-stage pump.

[0060] The pump outlet pipe of the present invention is internally installed with an internal plug check valve, and the pump and valve are integrated. The existing light-duty stamping multi-stage pump outlet must also be equipped with a check valve. In comparison, the present invention has lower costs and requires less installation space for the pump and valve system.

[0061] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A direct-connected permanent magnet high-speed pump, characterized in that: The direct-connected permanent magnet high-speed pump comprises: an inlet and outlet water section, an impeller nut, an impeller, a reverse guide vane, a shaft sleeve, an intermediate section, an upper casing, a permanent magnet high-speed motor, and an internal plug check valve; The inlet and outlet flanges at the bottom of the inlet and outlet sections are both pipeline connection flanges and the installation base of the pump. Through the inlet and outlet flanges, the pump is directly installed above the pipeline, and the overall weight of the pump is supported by the pipeline. An internal plug-type check valve is installed inside the outlet pipe side of the inlet and outlet sections; the upper part of the inlet and outlet sections is connected to the middle section, and the upper part of the middle section is connected to the upper shell; the three parts of the inlet and outlet sections, the middle section, and the upper shell form the pressure-bearing boundary of the pump; the pressure-bearing boundary has a volute-shaped water pressure chamber and a set of independent outlet pipes; A reverse guide vane is installed between the inlet and outlet sections and the middle section, and between the middle section and the upper casing. The reverse guide vane guides the impeller outlet liquid flow into the lower impeller inlet; The permanent magnet high-speed motor is provided with an extended shaft, and several impellers are fixed on the extended shaft. As the extended shaft rotates, the medium water enters the water inlet on one side of the inlet and outlet sections, performs work through the first impeller, and then passes through the first reverse guide vane for pressure boosting and drainage, enters the second impeller in the middle section, and then flows through the second reverse guide vane for drainage to the third impeller, and then enters the volute-shaped water pressure chamber in the upper shell to continue to boost the pressure, and finally enters the other side of the inlet and outlet sections to form an independent water outlet pipe composed of the inlet and outlet sections, the middle section, and the upper shell, and is discharged after flowing through the internal plug check valve.

2. The direct-connected permanent magnet high-speed pump according to claim 1, characterized in that: The upper part of the water inlet and outlet sections is connected to the middle section through a plum blossom flange, several bolts and two O-rings, and the upper part of the middle section is connected to the upper shell through a plum blossom flange, several bolts and two O-rings.

3. The direct-connected permanent magnet high-speed pump according to claim 1, characterized in that: The middle section and the upper shell are designed as castings.

4. The direct-connected permanent magnet high-speed pump according to claim 1, characterized in that: The permanent magnet high-speed motor is a permanent magnet high-speed motor with a rotation speed of up to 6000rpm.

5. The direct-connected permanent magnet high-speed pump according to claim 1, characterized in that: The inlet and outlet water sections use inlet and outlet pipes arranged vertically side by side. The lower inlet and outlet flanges are two pairs of waist-shaped flanges, which are arranged parallel to the inlet and outlet center lines at an angle of 60°. They are also the installation base of the pump, and the pump is installed directly above the pipeline.

6. The direct-connected permanent magnet high-speed pump according to claim 1, characterized in that: The rotating parts on the extended shaft of the permanent magnet high-speed motor include from bottom to top: a plurality of impellers, a plurality of shaft sleeves and a mechanical seal; the above parts are connected in series from bottom to top.

7. The direct-connected permanent magnet high-speed pump according to claim 6, characterized in that: The mechanical seal is a bulk rubber bellows mechanical seal. The rotating part of the mechanical seal is mounted on the extended shaft of the permanent magnet high-speed motor through the rubber bellows, and the fixed part of the mechanical seal is installed inside the upper shell.

8. The direct-connected permanent magnet high-speed pump according to claim 1, characterized in that: The mounting flange of the permanent magnet high-speed motor is connected to the upper flange of the upper shell through a plurality of bolts and positioning stoppers.

9. The direct-connected permanent magnet high-speed pump according to claim 1, characterized in that: An air release valve is installed at the end of the exhaust hole at the high point of the pump chamber in the upper shell.

10. The direct-connected permanent magnetic high-speed pump according to claim 1, characterized in that: The internal plug check valve is directly mounted inside the pump outlet pipe to integrate the pump and valve.

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