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

Abstract

The invention discloses a low-vibration double-cavity multi-tube-bundle integrated structure centrifugal pump which comprises a pump core, an outer shell, a vibration isolator and a multi-tube-bundle flow channel system, the pump core adopts an even number of stages of back-to-back impellers which are symmetrically arranged to form a force balance structure, and a motor is arranged in the waist of the pump core; an independent suction cavity and an independent pressure cavity are arranged in the outer shell, and a plurality of groups of micro-tube bundle flow channels are integrated in each cavity; the pump core and the outer shell are in multi-path coupling connection through the flexible vibration isolator and the distributed micro tube bundle. Through the synergistic effect of the flow resistance dissipation effect of the microtube bundle and the vortex interference mechanism of the double cavities, fluid pulsation energy is reflected and attenuated multiple times in the transmission process; meanwhile, multi-stage attenuation of vibration energy is achieved through flexible conduction of the micro tube bundle and the damping characteristic of the vibration isolator. The high-efficiency hydraulic pump has the characteristics of compact structure and modularization, realizes low-vibration and low-noise operation while ensuring high-efficiency hydraulic performance, and is suitable for the industrial fields with precision fluid conveying and high stability requirements.

Description

Technical Field

[0001] The present invention belongs to the field of fluid machinery and engineering equipment, and in particular relates to a low-vibration double-cavity multi-tube bundle integrated structure centrifugal pump. Background Art

[0002] With the continuous development of modern technology, pumps, whether in military or civilian use, have increasingly higher standards and requirements for vibration and noise. To achieve this goal, low vibration and noise of the pump are usually achieved through measures such as reducing the speed, optimizing the hydraulics, and adjusting the structure. However, while achieving the same design goals, reducing the speed will lead to an increase in the volume and weight of the pump, and there is also an upper limit to optimization when optimizing the hydraulic structure. For existing structural adjustment solutions, the centrifugal pump itself is usually the main base, and the base is directly installed on the pump. The vibration of the pump will be directly transmitted to the base, thereby affecting the vibration of the entire system. Therefore, traditional methods are no longer sufficient to meet the higher standards and requirements, such as those for military use. Summary of the Invention

[0003] The purpose of the present invention is to propose a low-vibration double-cavity multi-tube integrated structure centrifugal pump for places with high requirements on vibration and noise. The pump consists of a pump core, a double-cavity outer shell, inlet and outlet microtubes, and a vibration isolator. The pump core impeller is designed as an even-stage back-to-back structure, the motor is in the middle, the inlet and outlet are located on both sides of the motor, the double-cavity outer shell is located at the waist of the motor, and is connected to the pump core through the vibration isolator. The pump inlet and outlet are located in the outer shell and are respectively connected to the internal suction / pressure cavity, wherein the suction cavity is connected to the pump core inlet through multiple microtubes, and the pressure cavity is connected to the pump core outlet through multiple microtubes. Through the transition from pump core-vibration isolator-outer shell-external fixed platform, pump core-pump core inlet-inlet microtube-suction cavity-inlet flange, pump core-pump core outlet-outlet microtube-pressure cavity-outlet flange, the vibration of the pump foot and the inlet and outlet flanges is reduced.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A low-vibration double-cavity multi-tube bundle integrated structure centrifugal pump, comprising a pump core, an outer shell, a vibration isolator, an outlet micro-tube and an inlet micro-tube;

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

[0007] The pump core comprises a pump cover, an integrated stator, guide vanes and a pump body suction chamber which are sealed and connected in sequence 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 in sequence from bottom to top;

[0010] The integrated stator includes a pump body and a motor stator located inside the pump body, and the pump body is further provided with a transition flow channel, a secondary volute flow channel, and a plurality of 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 provided inside the pump cover;

[0011] A plurality of pump core inlets are provided on the pump body suction chamber;

[0012] The outer shell includes an inlet flange and an outlet flange on both sides, the inlet flange is provided with a pump inlet, and the outlet flange is provided with a pump outlet; the bottom of the inlet flange is a centrifugal pump mounting platform, and the outer shell is used to mount the entire centrifugal pump on an external fixed platform through the centrifugal pump mounting platform; the outer shell is provided with an annular suction chamber and a pressure chamber, the suction chamber is connected to the pump inlet, and has a plurality of openings at the bottom, which are connected to the top ends of a plurality of the inlet microtubes, the bottom ends of which are all connected to the suction chamber, so that the fluid enters the suction chamber in sequence through the pump inlet, the suction chamber, and the inlet microtubes; the pressure chamber is connected to the pump outlet, and a plurality of interfaces are provided at the top of the outlet chamber, which are respectively connected one-to-one with the bottom ends of the plurality of the outlet microtubes, the top ends of which are connected to the pump core outlet, so that the fluid pressurized by the secondary impeller is discharged out of the pump through the secondary volute flow channel, the outlet microtube, the pressure chamber, and the pump outlet in sequence.

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

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

[0015] Furthermore, the pump inlet and the pump outlet are symmetrically arranged 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 is 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, and the secondary guide bearing is located on the front cover side of the secondary impeller, and the thrust bearing is located on the rear cover side of the secondary impeller, thereby supporting the integrated rotor on the integrated stator.

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

[0018] 1. The low-vibration dual-chamber, multi-tube bundle integrated structure centrifugal pump of the present invention can meet the requirements of reducing 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 at the same time use the excess weight on the outer shell. The inner and outer parts achieve efficient attenuation of the fluid pulsation energy through the synergistic effect of the dual-chamber eddy current interference mechanism and the micro-tube bundle flow resistance dissipation, thereby achieving the effect of reducing vibration.

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

[0020] 3. The low-vibration dual-cavity, multi-tube bundle integrated structure centrifugal pump of the present invention has a pump core placed in an outer shell, and its inlet is connected to the suction chamber of the outer shell through multiple thin tubes. The inlet flow pattern is uniform and stable, and the inlet pressure pulsation is small, thereby reducing vibration noise; its outlet is connected to the pressure chamber of the outer shell through multiple thin tubes, and the outlet flow pattern is uniform and stable, and the outlet pressure pulsation is small, thereby further reducing vibration noise. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0024] In the figure, 1- pump core, 2- outer shell, 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 DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the purpose and effects of the present invention will become more apparent. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] As one of the implementation methods, Figure 1 As shown, the low-vibration double-cavity multi-tube bundle integrated structure centrifugal pump of this embodiment is a double-shell structure centrifugal pump, which includes a pump core 1, an outer shell 2, a vibration isolator 3, an outlet microtube 4, and an inlet microtube 5.

[0027] like Figure 1 and Figure 2 As shown, the pump core 1 is installed in the inner hole of the outer shell 2 through the intermediate vibration isolator 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, which are sealed and connected in sequence from top to bottom, and an integrated rotor 105 located inside the integrated stator 102, and also includes a primary guide bearing 106, a secondary guide bearing 107 and a thrust bearing 108.

[0029] Among them, the integrated rotor 105 includes a first-stage impeller 105-1, a secondary impeller 105-2 and a motor rotor 105-3. The first-stage 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 first-stage impeller 105-1 and the secondary impeller 105-2, and is integrated with the two-stage impellers; the first-stage guide bearing 106 is installed inside the guide vane 103 and is located on the inlet side of the first-stage 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, and the secondary guide bearing 107 is located on the front cover side of the secondary impeller 105-2, and the thrust bearing 108 is located on the rear cover 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] A secondary suction chamber is provided inside the pump cover 101. The pump body suction chamber 104 is located at the bottom of the entire centrifugal pump and includes a plurality of pump core inlets 104-1. The fluid enters the first-stage impeller 105-1 through the pump core inlet 104-1 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 is internally provided with a transition channel 102-4, a secondary volute channel 102-5, and a pump core outlet 102-6 extending from the secondary volute channel 102-5. The transition channel 102-4 connects the outlet channel of the guide vane 103 with the inlet channel of the secondary suction chamber 101-1, located within the pump cover 101. This allows the fluid, pressurized by the primary impeller 105-1, to be further pressurized by the secondary impeller 105-2. The secondary volute channel 102-5 delivers the fluid, further pressurized by the secondary impeller 105-2, to the multiple pump core outlets 102-6.

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

[0034] like Figure 2 As shown, the outer shell 2 includes an inlet flange and an outlet flange on either side. The inlet flange is provided with a pump inlet 201, and the outlet flange is provided with a pump outlet 204. The bottom of the inlet flange is a centrifugal pump mounting platform 205. Both the pump inlet 201 and the pump outlet 204 are located above the centrifugal pump mounting platform 205 and are circumferentially staggered according to user needs. Preferably, the pump inlet 201 and the pump outlet 204 are symmetrically arranged on either side of the motor to further reduce pump vibration. The outer shell 2 uses the centrifugal pump mounting platform 205 to mount the entire centrifugal pump on an external fixed platform.

[0035] An unconnected annular suction chamber 202 and a pressure chamber 203 are provided inside the outer shell 2. The suction chamber 202 is located at the bottom of the outer shell 2 and is connected to the pump inlet 201. The bottom has several openings, which are connected to the top ends of several inlet microtubes 5. The bottom ends of several inlet microtubes 5 are all connected to the suction chamber 104, so that the fluid enters the suction chamber 104 through the pump inlet 201, the suction chamber 202, and the inlet microtube 5 in sequence; 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, which are connected one-to-one with the bottom ends of several outlet microtubes 4 respectively. The top ends of several outlet microtubes 4 are connected to the pump core outlet 102-6, so that the fluid pressurized by the secondary impeller 105-2 is discharged out of the pump through the secondary volute flow channel 102-5, the outlet microtube 4, the pressure chamber 203, and the pump outlet 204 in sequence.

[0036] The installation sequence of the low-vibration dual-cavity multi-tube bundle integrated structure centrifugal pump of 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 to 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, and 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 working sequence is as follows: fluid is drawn in through the pump inlet 201 of the outer shell 2, passes through the suction chamber 202 of the outer shell 2, the inlet microtube 5, the suction chamber 104, and flows into the primary impeller 105-1, where it performs work. It then enters the guide vanes 103 inside the pump core 1 for pressure expansion. It then 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 performing work in the secondary impeller 105-2, which is back-to-back with the primary impeller 105-1, it flows out of the pump core outlet 102-6, into the outlet microtube 4, and after being collected in the pressure chamber 203, it flows out of the pump outlet 204. Thus, the energy of the pump core 1 passes through the vibration isolator 3 at the waist, the outlet microtube 4, and the inlet microtube 5, and then through the dual-chamber structure of the outer shell 2, resulting in a uniform and stable flow pattern. Ultimately, energy is attenuated at the outer shell foot 2 and the pump inlet and outlet, thereby reducing vibration and noise.

[0039] Those skilled in the art will understand that the foregoing descriptions are merely preferred embodiments 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 will still be able to modify the technical solutions described in the foregoing examples or substitute equivalents for some of the technical features therein. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the invention shall be included within the scope of protection of the invention.

Claims

1. A low-vibration dual-cavity multi-tube bundle integrated structure centrifugal pump, characterized in that: It includes a pump core, an outer shell, a vibration isolator, an outlet micro tube and an inlet micro tube; The pump core is installed in the inner hole of the outer shell through the vibration isolator; The pump core comprises a pump cover, an integrated stator, guide vanes and a pump body suction chamber which are sealed and connected in sequence 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 in sequence from bottom to top; The integrated stator includes a pump body and a motor stator located inside the pump body, and the pump body is further provided with a transition flow channel, a secondary volute flow channel, and a plurality of 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 provided inside the pump cover; A plurality of pump core inlets are provided on the pump body suction chamber; The outer shell includes an inlet flange and an outlet flange on both sides, the inlet flange is provided with a pump inlet, and the outlet flange is provided with a pump outlet; the bottom of the inlet flange is a centrifugal pump mounting platform, and the outer shell is used to mount the entire centrifugal pump on an external fixed platform through the centrifugal pump mounting platform; the outer shell is provided with an annular suction chamber and a pressure chamber, the suction chamber is connected to the pump inlet, and has a plurality of openings at the bottom, which are connected to the top ends of a plurality of the inlet micro-tubes, the bottom ends of which are all connected to the suction chamber, so that the fluid enters the suction chamber in sequence through the pump inlet, the suction chamber, and the inlet micro-tubes; the pressure chamber is connected to the pump outlet, and a plurality of interfaces are provided at the top of the pressure chamber, which are respectively connected one-to-one with the bottom ends of the plurality of the outlet micro-tubes, the top ends of which are connected to the pump core outlet, so that the fluid pressurized by the secondary impeller is discharged out of the pump through the secondary volute flow channel, the outlet micro-tubes, the pressure chamber, and the pump outlet in sequence.

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

3. The low-vibration dual-cavity multi-tube bundle integrated structure centrifugal pump according to claim 1, characterized in that: The pump inlet and the pump outlet are both located above the centrifugal pump installation platform.

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

5. The low-vibration dual-cavity multi-tube bundle integrated structure 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 is 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, and the secondary guide bearing is located on the front cover side of the secondary impeller, and the thrust bearing is located on the rear cover side of the secondary impeller, thereby supporting the integrated rotor on the integrated stator.

Images