Low-vibration double-cavity multi-tube bundle integrated structure centrifugal pump

Abstract

The application discloses a low-vibration double-cavity multi-tube bundle integrated structure centrifugal pump, which comprises a pump core, an outer shell, a vibration isolation body and a multi-tube bundle flow channel system, wherein the pump core is symmetrically arranged in an even number of back-to-back impeller pairs to form a force balance structure, and a motor is built in the waist part of the pump core; an independent suction chamber and a pressure chamber are arranged in the outer shell, and multiple groups of micro tube bundle flow channels are integrated in each chamber; the pump core and the outer shell are connected through a flexible vibration isolation body and a distributed micro tube bundle to realize multi-path coupling. The flow resistance dissipation effect of the micro tube bundle and the vortex interference mechanism of the double-chamber are cooperated to reflect and attenuate the fluid pulsation energy multiple times in the transmission process; meanwhile, the vibration energy is attenuated multiple times through the flexible conduction of the micro tube bundle and the damping characteristics of the vibration isolation body. The application has the characteristics of compact structure and modularity, can ensure high efficient hydraulic performance, realize low-vibration and low-noise operation, and is suitable for the industrial fields with high stability requirements and precise fluid conveying.

Description

Technical Field

[0001] This invention belongs to the field of fluid machinery and engineering equipment, and specifically relates to a low-vibration dual-chamber multi-tube bundle integrated centrifugal pump. Background Technology

[0002] With the continuous development of modern technology, pumps, whether used in military or civilian applications, face increasingly stringent standards and requirements regarding vibration and noise. To achieve this, measures such as reducing pump speed, optimizing hydraulics, and adjusting the structure are commonly employed to reduce pump vibration and noise. However, to achieve the same design goals, reducing the speed leads to an increase in pump size and weight, and there are upper limits to optimizing the hydraulic structure. Existing structural adjustment solutions typically use the centrifugal pump itself as the main base, with the base directly mounted to the pump. This means the pump's vibration is directly transmitted to the base, thus affecting the overall system vibration. Therefore, traditional methods are no longer sufficient to meet the higher standards and requirements, such as those for military applications. Summary of the Invention

[0003] The purpose of this invention is to propose a low-vibration dual-chamber multi-tube bundle integrated centrifugal pump for applications requiring high vibration and noise control. This pump consists of a pump core, a dual-chamber outer shell, inlet and outlet micro-tubes, and a vibration isolator. The pump core impeller is designed with an even-number back-to-back structure. The motor is located in the middle, with the inlet and outlet on either side of the motor. The dual-chamber outer shell is located at the waist of the motor and is connected to the pump core via the vibration isolator. The pump inlet and outlet are located within the outer shell and are connected to the internal suction / pressure chambers, respectively. The suction chamber is connected to the pump core inlet via multiple micro-tubes, and the pressure chamber is connected to the pump core outlet via multiple micro-tubes. This transition from pump core to vibration isolator to outer shell to external fixed platform, pump core to pump core inlet to inlet micro-tube to suction chamber to inlet flange, and pump core to pump core outlet to outlet micro-tube to pressure chamber to outlet flange effectively reduces vibration at the pump feet and inlet / outlet flanges.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A low-vibration dual-chamber multi-tube bundle integrated centrifugal pump includes a pump core, a housing, a vibration isolator, an outlet microtube, and an inlet microtube.

[0006] The pump core is installed in the inner hole of the outer casing through the vibration isolator;

[0007] The pump core includes a pump cover, an integrated stator, guide vanes and a pump body suction chamber that are sealed together from top to bottom, and an integrated rotor located inside the integrated stator;

[0008] A secondary suction chamber is provided inside the pump cover;

[0009] The integrated rotor comprises a primary impeller, a motor rotor, and a secondary impeller arranged sequentially from bottom to top;

[0010] The integrated stator includes a pump body and a motor stator located inside the pump body. The pump body also has a transition flow channel, a secondary volute flow channel and several pump core outlets extending from the secondary volute flow channel. The transition flow channel connects the outlet flow channel of the guide vane and the inlet flow channel of the secondary suction chamber opened inside the pump cover.

[0011] Several pump core inlets are provided on the pump body suction chamber;

[0012] The outer casing includes inlet flanges and outlet flanges located on both sides. The inlet flanges have a pump inlet, and the outlet flanges have a pump outlet. The bottom of the inlet flanges is a centrifugal pump mounting platform, through which the entire centrifugal pump is mounted on an external fixed platform. Inside the outer casing are annular suction chambers and pressure chambers. The suction chamber communicates with the pump inlet and has several openings at its bottom, which connect to the top ends of several inlet microtubes. The bottom ends of these inlet microtubes are connected to the suction chamber, allowing fluid to sequentially enter the suction chamber through the pump inlet, suction chamber, and inlet microtubes. The pressure chamber communicates with the pump outlet, and the top of the outlet chamber has multiple interfaces, each connecting one-to-one to the bottom end of several outlet microtubes. The top ends of these outlet microtubes are connected to the pump core outlet, allowing fluid pressurized by the secondary impeller to sequentially pass through the secondary volute flow channel, outlet microtubes, pressure chamber, and pump outlet before being discharged from the pump.

[0013] Furthermore, the suction chamber is located at the bottom of the outer casing, and the pressure chamber is located above the suction chamber.

[0014] Furthermore, both the pump inlet and the pump outlet are located above the centrifugal pump mounting platform.

[0015] Furthermore, the pump inlet and pump outlet are symmetrically positioned on both sides of the motor.

[0016] Furthermore, the pump core also includes a primary guide bearing, a secondary guide bearing, and a thrust bearing; the primary guide bearing is installed inside the guide vane and located on the inlet side of the primary impeller of the integrated rotor; the secondary guide bearing and the thrust bearing are installed inside the integrated stator; the secondary guide bearing is located on the front cover plate side of the secondary impeller, and the thrust bearing is located on the rear cover plate side of the secondary impeller, thereby supporting the integrated rotor on the integrated stator.

[0017] The beneficial effects of this invention are mainly reflected in the following aspects:

[0018] 1. The low-vibration dual-chamber multi-tube bundle integrated centrifugal pump of the present invention can reduce the overall weight and size of the pump under the same design requirements. Moreover, while maintaining low weight and small size, the present invention can also reduce the pump core structure by increasing the rotational speed, and use the excess weight on the outer shell. The inner and outer parts, through the synergistic effect of the dual-chamber eddy current interference mechanism and the flow resistance dissipation of the microtube bundle, enable the fluid pulsation energy to be efficiently attenuated, thereby reducing vibration.

[0019] 2. The low-vibration dual-cavity multi-tube bundle integrated centrifugal pump of the present invention separates the pump core from the outer shell (i.e., the mounting base) and adopts a multi-stage vibration reduction system (flexible vibration isolator + distributed microtube bundle), and the vibration source transmission path achieves multiple attenuation, thereby reducing the overall vibration of the pump.

[0020] 3. The low-vibration dual-chamber multi-tube bundle integrated centrifugal pump of the present invention has a pump core placed inside the outer shell. Its inlet is connected to the suction chamber of the outer shell through multiple thin tubes, resulting in a uniform and stable inlet flow and small inlet pressure pulsation, thus reducing vibration noise. Its outlet is connected to the pressure chamber of the outer shell through multiple thin tubes, resulting in a uniform and stable outlet flow and small outlet pressure pulsation, thereby further reducing vibration noise. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the low-vibration dual-chamber multi-tube bundle integrated centrifugal pump according to an embodiment of the present invention.

[0022] Figure 2 A front sectional view of a low-vibration dual-chamber multi-tube bundle integrated centrifugal pump according to an embodiment of the present invention.

[0023] Figure 3 This is a front sectional view of the pump core of a low-vibration dual-chamber multi-tube bundle integrated centrifugal pump according to an embodiment of the present invention.

[0024] In the diagram, 1-pump core, 2-outer casing, 3-vibration isolator, 4-outlet micro-tube, 5-inlet micro-tube, 101-pump cover, 102-integrated stator, 103-guide vane, 104-suction chamber, 105-integrated rotor, 106-first-stage guide bearing, 107-secondary guide bearing, 108-thrust bearing, 101-1-secondary suction chamber, 102-1-pump body, 102-2-motor stator, 102-3-stator end cover, 102-4-transition flow channel, 102-5-secondary volute, 102-6-pump core outlet, 102-7-pump core mounting platform, 105-1-first-stage impeller, 105-2-secondary impeller, 105-3-motor rotor, 201-pump inlet, 202-suction chamber, 203-pressure chamber, 204-pump outlet, 205-centrifugal pump mounting platform. Detailed Implementation

[0025] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become clearer. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0026] As one implementation method, such as Figure 1 As shown, the low-vibration dual-chamber multi-tube bundle integrated centrifugal pump of this embodiment is a dual-shell centrifugal pump. The pump includes a pump core 1, an outer shell 2, a vibration isolator 3, an outlet micro-tube 4, and an inlet micro-tube 5.

[0027] like Figure 1 and Figure 2 As shown, the pump core 1 is installed in the inner hole of the outer casing 2 through the intermediate spacer 3.

[0028] like Figure 3 As shown, the pump core 1 includes a pump cover 101, an integrated stator 102, a guide vane 103 and a pump body suction chamber 104 that are sealed and connected from top to bottom, as well as an integrated rotor 105 located inside the integrated stator 102. It also includes a primary guide bearing 106, a secondary guide bearing 107 and a thrust bearing 108.

[0029] The integrated rotor 105 includes a primary impeller 105-1, a secondary impeller 105-2, and a motor rotor 105-3. The primary impeller 105-1 and the secondary impeller 105-2 are arranged back-to-back. The motor rotor 105-3 is located in the middle of the primary impeller 105-1 and the secondary impeller 105-2 and is integrated with the two impellers. The primary guide bearing 106 is installed inside the guide vane 103 and is located on the inlet side of the primary impeller 105-1 of the integrated rotor 105. The secondary guide bearing 107 and the thrust bearing 108 are installed inside the integrated stator 102. The secondary guide bearing 107 is located on the front cover plate side of the secondary impeller 105-2, and the thrust bearing 108 is located on the rear cover plate side of the secondary impeller 105-2, thereby supporting the integrated rotor 105 on the integrated stator 102 and forming a grinding pair with the integrated rotor 105.

[0030] The pump cover 101 has a secondary suction chamber inside, and the pump body suction chamber 104 is located at the bottom of the entire centrifugal pump. It includes several pump core inlets 104-1, through which the fluid enters the primary impeller 105-1 for pressurization.

[0031] The integrated stator 102 includes a pump body 102-1, a motor stator 102-2, and a stator end cover 102-3. The pump body 102-1 is a thick-walled cylindrical structure. The motor stator 102-2 is located inside the pump body 102-1, and its bottom is sealed by the stator end cover 102-3 and supported on the guide vane 103.

[0032] The pump body 102-1 has an internal transition flow channel 102-4, a secondary volute flow channel 102-5, and a pump core outlet 102-6 extending from the secondary volute flow channel 102-5. The transition flow channel 102-4 connects the outlet flow channel of the guide vane 103 and the inlet flow channel of the secondary suction chamber 101-1 inside the pump cover 101, thereby further conveying the fluid pressurized by the first-stage impeller 105-1 to the secondary impeller 105-2 for further pressurization. The secondary volute flow channel 102-5 conveys the fluid further pressurized by the secondary impeller 105-2 to multiple pump core outlets 102-6.

[0033] A pump core mounting platform 102-7 is provided on the waist of the outer side of the pump body 102-1. The entire pump core 1 is mounted in the inner hole of the outer casing 2 through the pump core mounting platform 102-7 and the vibration isolator 3. The motor stator 102-2 and the motor rotor 105-3 constitute the motor, and the mounting position of the outer casing 2 is located at the waist of the motor.

[0034] like Figure 2 As shown, the outer casing 2 includes an inlet flange and an outlet flange located on both sides. The inlet flange has a pump inlet 201, and the outlet flange has a pump outlet 204. The bottom of the inlet flange is a centrifugal pump mounting platform 205. Both the pump inlet 201 and pump outlet 204 are located above the centrifugal pump mounting platform 205, and are arranged in a staggered circumferential manner according to user requirements. Preferably, the pump inlet 201 and pump outlet 204 are arranged symmetrically on both sides of the motor, which can further reduce pump vibration. The outer casing 2 mounts the entire centrifugal pump on an external fixed platform via the centrifugal pump mounting platform 205.

[0035] The outer casing 2 has an open, non-connected annular suction chamber 202 and pressure chamber 203. The suction chamber 202 is located at the bottom of the outer casing 2 and is connected to the pump inlet 201. It has several openings at the bottom that are connected to the top ends of several inlet micro-tubes 5. The bottom ends of the inlet micro-tubes 5 are all connected to the suction chamber 104, so that the fluid enters the suction chamber 104 sequentially through the pump inlet 201, the suction chamber 202, and the inlet micro-tubes 5. The pressure chamber 203 is located above the suction chamber 202 and is connected to the pump outlet 204. The top of the pressure chamber 203 has multiple interfaces that are connected one-to-one to the bottom ends of several outlet micro-tubes 4. The top ends of the outlet micro-tubes 4 are connected to the pump core outlet 102-6, so that the fluid pressurized by the secondary impeller 105-2 is discharged from the pump sequentially through the secondary volute flow channel 102-5, the outlet micro-tubes 4, the pressure chamber 203, and the pump outlet 204.

[0036] The installation sequence of the low-vibration dual-chamber multi-tube bundle integrated centrifugal pump in this embodiment is as follows:

[0037] like Figure 2As shown, the top end of the inlet microtube 5 and the bottom end of the outlet microtube 4 are respectively installed on the outer shell 2. The vibration isolator 3 is connected inside the outer shell 2. The pump core mounting platform 102-7 of the integrated stator 102 is connected to the vibration isolator 3. The suction chamber 104 is installed to the inlet of the pump core 1. The suction chamber 104 is connected to the bottom end of the inlet microtube 5 and the top end of the outlet microtube 4 is connected to the integrated stator 102. The installation and disassembly are simple and reliable.

[0038] The work sequence is as follows: fluid is drawn in from the pump inlet 201 of the outer casing 2, flows through the suction chamber 202, inlet micro-tube 5, and suction chamber 104 of the outer casing 2, and then flows into the first-stage impeller 105-1 to perform work. After being diffused by the guide vanes 103 inside the pump core 1, it flows along the transition channel 102-4 inside the integrated stator 102 into the secondary suction chamber 101-1 inside the opposite pump cover 101. After being diffused by the secondary impeller 105-2, which is back-to-back with the first-stage impeller 105-1, it flows out from the pump core outlet 102-6 to the outlet micro-tube 4, and after being collected in the pressure chamber 203, it flows out from the pump outlet 204. Thus, the energy of the pump core 1 is uniformly and stably flowed through the vibration isolator 3 at the waist, the outlet micro-tube 4, and the inlet micro-tube 5, and then through the dual-chamber structure of the outer casing 2. This results in energy attenuation at the outer casing feet 2 and the pump inlet and outlet, thereby reducing vibration and noise.

[0039] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A low-vibration dual-chamber multi-tube bundle integrated centrifugal pump, characterized in that, Includes pump core, housing, vibration isolator, outlet microtube and inlet microtube; The pump core is installed in the inner hole of the outer casing through the vibration isolator; The pump core includes a pump cover, an integrated stator, guide vanes and a pump body suction chamber that are sealed together from top to bottom, and an integrated rotor located inside the integrated stator; A secondary suction chamber is provided inside the pump cover; The integrated rotor comprises a primary impeller, a motor rotor, and a secondary impeller arranged sequentially from bottom to top; The integrated stator includes a pump body and a motor stator located inside the pump body. The pump body also has a transition flow channel, a secondary volute flow channel and several pump core outlets extending from the secondary volute flow channel. The transition flow channel connects the outlet flow channel of the guide vane and the inlet flow channel of the secondary suction chamber opened inside the pump cover. Several pump core inlets are provided on the pump body suction chamber; The outer casing includes inlet flanges and outlet flanges located on both sides. The inlet flanges have a pump inlet, and the outlet flanges have a pump outlet. The bottom of the inlet flanges is a centrifugal pump mounting platform, through which the entire centrifugal pump is mounted on an external fixed platform. Inside the outer casing are annular suction chamber and pressure chamber. The suction chamber communicates with the pump inlet and has several openings at its bottom, which connect to the top ends of several inlet microtubes. The bottom ends of these inlet microtubes are all connected to the suction chamber, allowing fluid to sequentially enter the suction chamber through the pump inlet, suction chamber, and inlet microtubes. The pressure chamber communicates with the pump outlet, and its top has multiple interfaces, each connecting one-to-one to the bottom end of several outlet microtubes. The top ends of these outlet microtubes are connected to the pump core outlet, allowing the fluid, pressurized by the secondary impeller, to sequentially pass through the secondary volute flow channel, outlet microtubes, pressure chamber, and pump outlet before being discharged from the pump.

2. The low-vibration dual-chamber multi-tube bundle integrated centrifugal pump according to claim 1, characterized in that, The suction chamber is located at the bottom of the outer casing, and the pressure chamber is located above the suction chamber.

3. The low-vibration dual-chamber multi-tube bundle integrated centrifugal pump according to claim 1, characterized in that, Both the pump inlet and the pump outlet are located above the centrifugal pump mounting platform.

4. The low-vibration dual-chamber multi-tube bundle integrated centrifugal pump according to claim 3, characterized in that, The pump inlet and outlet are symmetrically placed on both sides of the motor.

5. The low-vibration dual-chamber multi-tube bundle integrated centrifugal pump according to claim 1, characterized in that, The pump core also includes a primary guide bearing, a secondary guide bearing, and a thrust bearing; the primary guide bearing is installed inside the guide vane and located on the inlet side of the primary impeller of the integrated rotor; the secondary guide bearing and the thrust bearing are installed inside the integrated stator; the secondary guide bearing is located on the front cover plate side of the secondary impeller, and the thrust bearing is located on the rear cover plate side of the secondary impeller, thereby supporting the integrated rotor on the integrated stator.

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