Low-vibration high-lift spiral constant pressure pump

Abstract

The utility model discloses a low-vibration high-lift spiral constant-pressure pump, and belongs to the technical field of water pumps. Comprising two pump shells which are buckled oppositely and internally form a spiral mounting cavity, an impeller horizontally mounted in the spiral mounting cavity through a pump shaft, and a buffer base mounted at the bottom ends of the pump shells; the guide vanes at the water inlet can guide fluid to flow into the impeller at an axial uniform speed, inlet vortex loss is reduced, kinetic energy of the fluid is converted into pressure energy more efficiently, the guide ribs at the water outlet can reduce outlet pressure fluctuation, lift stability is improved, vibration excitation sources caused by fluid impact are reduced, and the service life of the impeller is prolonged. The bottom end of the spiral constant-pressure pump is connected with the buffer base, the vibration amplitude of the pump body is directly reduced, the vibration transmissibility is reduced, and the abnormal vibration risk is reduced; in short, the spiral constant pressure pump has the characteristics of low vibration and high lift, and is suitable for popularization.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology, specifically to a low-vibration, high-lift spiral constant-pressure pump. Background Technology

[0002] A spiral constant-pressure pump is a type of pump that uses a spiral structure to transport fluids and maintain a stable output pressure. In the field of fluid transport, high-lift spiral constant-pressure pumps are widely used in industrial water supply, water conservancy projects, and other applications due to their stable flow rate and high head. However, traditional high-lift pumps generally suffer from the following problems during operation:

[0003] Significant vibration and noise: The interaction between the high-speed impeller and the fluid can easily cause fluid pulsation. At the same time, the rigid connection of the pump body structure causes vibration energy to be directly transmitted to the base, which not only affects the service life of the equipment, but may also cause environmental noise pollution.

[0004] The contradiction between head and efficiency: In order to increase the head, traditional screw pumps need to increase the impeller speed or number of stages, but high speed will aggravate mechanical wear, and the fluid is prone to eddy loss due to the sudden change in flow channel when entering and exiting the pump chamber, resulting in a deviation between the actual head and the theoretical design.

[0005] Therefore, there is an urgent need for a low-vibration, high-lift spiral constant-pressure pump. Utility Model Content

[0006] To address the aforementioned problems, this utility model discloses a low-vibration, high-lift spiral constant-pressure pump.

[0007] The technical solution of this utility model is: a low-vibration, high-lift spiral constant-pressure pump, comprising two pump casings that are interlocked and form a spiral mounting cavity inside, an impeller that is horizontally mounted in the spiral mounting cavity via a pump shaft, and a buffer base mounted at the bottom of the pump casing.

[0008] The pump shaft is supported at both ends by angular contact ball bearings. The side wall of the spiral mounting cavity is provided with a gradually expanding inlet in the shape of a trumpet and an outlet in the shape of a spiral diffusion. Several guide vanes are evenly distributed along the circumference of the inner wall of the inlet, and the inner wall of the outlet is provided with streamlined wing-shaped guide ribs.

[0009] The buffer base is fixedly connected to the external ground by fixing bolts.

[0010] Furthermore, the buffer base includes a mounting base plate, a sliding buffer seat disposed on the upper end of the mounting base plate and having a receiving recess at the center, and a fixed connecting block having a snap-fit ​​ring on the outer periphery of the upper wall and a lower wall slidably connected to the side wall of the receiving recess via a sliding strip. The bottom end of the snap-fit ​​ring is connected to the upper end of the sliding buffer seat via a buffer spring rod, and the bottom end of the pump casing is connected to the fixed connecting block.

[0011] Explanation: The mounting base plate is fixedly connected to the external ground using fixing bolts. When the screw constant pressure pump is working, it will vibrate. At this time, the pump casing is installed on the upper end of the fixed connecting block, and the vibration force will act on the fixed connecting block. Since the fixed connecting block can slide along the side wall of the receiving recess, it can effectively absorb the horizontal vibration energy of the pump casing. At the same time, since the bottom end of the fastening ring is connected to the upper end of the sliding buffer seat through the buffer spring rod, when the fastening ring and the fixed connecting block move synchronously, the buffer spring rod forms a non-linear damping characteristic in the vertical direction, which further buffers and absorbs the vibration energy. The above process limits the vibration energy to the internal loss of the buffer base, which not only directly reduces the vibration amplitude, but also indirectly improves the reliability, life and quiet performance of the screw constant pressure pump by optimizing the vibration transmission path and energy loss mechanism.

[0012] Furthermore, an annular sliding plate is provided at the bottom end of the fastening ring and at the periphery of the sliding buffer seat, and the inner wall of the annular sliding plate is slidably connected to the outer wall of the sliding buffer seat through a sliding block.

[0013] Explanation: When the fastening ring and the fixed connecting block move synchronously, on the one hand, the fixed connecting block can slide along the inner wall of the receiving recess, and on the other hand, the inner wall of the annular sliding plate slides up and down with the outer wall of the sliding buffer seat through the sliding block, providing precise guidance for the sliding process, avoiding the pump casing from tilting or shifting during vibration, and ensuring the relative position of each component is stable.

[0014] Furthermore, an elastic buffer pad is laid at the bottom of the fixed connecting block.

[0015] Note: When the fixed connecting block slides up and down along the inner wall of the receiving recess with a large amplitude, the elastic buffer pad at its bottom end will collide with the receiving recess. Due to the elastic effect of the elastic buffer pad, it can buffer the vibration amplitude on the one hand, and avoid damage to the internal buffer base caused by hard collision on the other hand, thus ensuring its service life.

[0016] Furthermore, the fixing bolts are evenly arranged around the circumference of the mounting base plate, the angle between the center line of adjacent fixing bolts and the axis of the pump shaft is 30° to 45°, and the preload deviation of the fixing bolts is ≤3%.

[0017] Explanation: The fixing bolts are evenly distributed around the circumference of the mounting base plate so that the vibration load transmitted from the pump casing to the ground through the buffer base is evenly distributed across the various support points of the bolt group. This avoids excessive stress on local bolts, reduces local deformation at the interface between the buffer base and the ground, and maintains installation stability. By limiting the angle between the center line of adjacent fixing bolts and the pump shaft axis to 30° to 45°, the radial hydraulic pressure and tangential driving force simultaneously borne by the pump body under high-lift conditions can be balanced, avoiding overload in one direction. By limiting the preload deviation of the fixing bolts, individual fixing bolts are prevented from loosening due to insufficient preload or from breaking due to overload due to excessive preload.

[0018] The beneficial effects of this utility model are:

[0019] This utility model's low-vibration, high-lift spiral constant-pressure pump utilizes in-inlet guide vanes to direct fluid into the impeller at a uniform axial velocity, reducing inlet eddy current losses and efficiently converting fluid kinetic energy into pressure energy. In-outlet guide ribs reduce outlet pressure fluctuations, improving head stability and minimizing vibration excitation sources caused by fluid impact. A buffer base connects to the bottom of the pump, mitigating vibrations during operation. A fixed connecting block slides with a recessed slot via a sliding strip, creating a dynamic horizontal buffer that converts the lateral vibration energy of the pump casing into sliding friction loss, directly reducing vibration amplitude. A buffer spring rod provides elastic support between the snap ring and the sliding buffer seat, absorbing vertical vibration energy using the spring's non-linear characteristics, reducing vibration transmission rate. An annular sliding plate, through a sliding block and sliding buffer seat, ensures the pump body maintains a vertical orientation during vibration, preventing impeller eccentric wear due to tilting and further reducing the risk of abnormal vibration. In summary, this spiral constant-pressure pump features low vibration and high lift, making it suitable for widespread application. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a partial structural diagram of the water inlet of this utility model;

[0022] Figure 3 This is a partial structural diagram of the water outlet of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the buffer base of this utility model.

[0024] Among them, 1-pump casing, 10-spiral mounting cavity, 100-inlet, 101-outlet, 102-guide vane, 103-guide rib, 2-impeller, 20-pump shaft, 3-buffer base, 30-fixing bolt, 31-mounting base plate, 32-sliding buffer seat, 320-accommodating notch, 33-fixed connecting block, 330-fastening ring, 331-sliding strip, 332-buffer spring rod, 333-annular sliding plate, 334-sliding block, 335-elastic buffer pad, 4-angular contact ball bearing. Detailed Implementation

[0025] Example 1: As Figure 1 , 2As shown in Figure 3, a low-vibration, high-lift spiral constant-pressure pump includes two pump casings 1 that are interlocked and form a spiral mounting cavity 10 inside, an impeller 2 that is horizontally mounted in the spiral mounting cavity 10 via a pump shaft 20, and a buffer base 3 mounted at the bottom of the pump casing 1.

[0026] The pump shaft 20 is supported at both ends by angular contact ball bearings 4. The side wall of the spiral mounting cavity 10 is provided with a gradually expanding inlet 100 in the shape of a trumpet and an outlet 101 in the shape of a spiral. The inner wall of the inlet 100 is evenly distributed with 4 guide vanes 102 in the circumferential direction, and the inner wall of the outlet 101 is provided with streamlined wing-shaped guide ribs 103.

[0027] The buffer base 3 is fixedly connected to the external ground by fixing bolts 30;

[0028] like Figure 1 , 4 As shown, the buffer base 3 includes a mounting base plate 31, a sliding buffer seat 32 located on the upper end of the mounting base plate 31 with a receiving recess 320 at its center, and a fixed connecting block 33 with a snap-fit ​​ring 330 on its upper outer perimeter and a sliding strip 331 slidably connected to the side wall of the receiving recess 320 on its lower wall. The bottom end of the snap-fit ​​ring 330 is connected to the upper end of the sliding buffer seat 32 via a buffer spring rod 332. The bottom end of the pump housing 1 is connected to the fixed connecting block 33. The mounting base plate 31 is fixedly connected to the external ground by fixing bolts 30. When the spiral constant pressure pump is working, it will vibrate. At this time, the pump housing 1 is mounted on the upper end of the fixed connecting block 33, and the vibration force will act on the fixed connecting block 33. 3. Since the fixed connecting block 33 can slide along the side wall of the receiving recess 320, it can effectively absorb the horizontal vibration energy of the pump casing 1. At the same time, since the bottom end of the fastening ring 330 is connected to the upper end of the sliding buffer seat 32 through the buffer spring rod 332, when the fastening ring 330 and the fixed connecting block 33 move synchronously, the buffer spring rod 332 forms a nonlinear damping characteristic in the vertical direction, which further buffers and absorbs the vibration energy. The above process limits the vibration energy to the internal loss of the buffer base 3, which not only directly reduces the vibration amplitude, but also indirectly improves the reliability, life and quiet performance of the spiral constant pressure pump by optimizing the vibration transmission path and energy loss mechanism.

[0029] An annular sliding plate 333 is provided at the bottom of the snap ring 330 and at the periphery of the sliding buffer seat 32. The inner wall of the annular sliding plate 333 is slidably connected to the outer wall of the sliding buffer seat 32 through the sliding block 334. When the snap ring 330 and the fixed connecting block 33 move synchronously, on the one hand, the fixed connecting block 33 can slide along the inner wall of the receiving recess 320, and on the other hand, the inner wall of the annular sliding plate 333 is slidably connected to the outer wall of the sliding buffer seat 32 through the sliding block 334, providing precise guidance for the sliding process, avoiding the pump casing 1 from tilting or shifting during vibration, and ensuring the relative position of each component is stable.

[0030] The bottom of the fixed connecting block 33 is covered with an elastic buffer pad 335. The material of the elastic buffer pad 335 is a common elastic buffer material in the field, and no special limitation is made here. When the fixed connecting block 33 slides up and down along the inner wall of the receiving recess 320 with a large amplitude, when the elastic buffer pad 335 at its bottom end collides with the receiving recess 320, due to the elastic effect of the elastic buffer pad 335, it can buffer the vibration amplitude on the one hand, and avoid hard collisions that could cause damage to the inside of the buffer base 3 on the other hand, thus ensuring its service life.

[0031] The fixing bolts 30 are evenly arranged around the circumference of the mounting base plate 31. The angle between the center line of adjacent fixing bolts 30 and the axis of the pump shaft 20 is 30°, and the preload deviation of the fixing bolts 30 is 3%. The even arrangement of the fixing bolts 30 around the circumference of the mounting base plate 31 ensures that the vibration load transmitted from the pump casing 1 to the ground through the buffer base 3 is evenly distributed among the various support points of the bolt group, avoiding excessive stress on local bolts, reducing local deformation at the interface between the buffer base 3 and the ground, and maintaining installation stability. By limiting the angle between the center line of adjacent fixing bolts 30 and the axis of the pump shaft 20, the radial hydraulic pressure such as the impeller centrifugal force and the tangential driving force such as the motor torque that the pump body simultaneously bears under high head conditions can be balanced, avoiding overload in one direction. By limiting the preload deviation of the fixing bolts 30, individual fixing bolts 30 are prevented from loosening due to insufficient preload or from breaking due to overload due to excessive preload.

[0032] In actual use, the low-vibration, high-lift spiral constant-pressure pump of this embodiment uses fixing bolts 30 to fix the mounting base plate 31 to the external ground. The motor drives the pump shaft 20 to rotate, which drives the impeller 2 to rotate at high speed. The impeller 2 pushes the fluid from the inlet 100 into the spiral mounting cavity 10 to perform centrifugal motion, so that the fluid gains kinetic energy. At the same time, a low-pressure zone is formed in the spiral mounting cavity 10, thereby drawing in more fluid. The high-speed fluid thrown out by the impeller 2 passes through the outlet 101 with a gradually expanding cross-sectional area, converting the fluid kinetic energy into pressure energy and achieving high-lift output.

[0033] When the fluid enters the spiral mounting cavity 10 through the inlet 100, the design of the bell mouth reduces the inlet flow velocity. Combined with the various guide vanes 102, the axially flowing fluid is guided into circumferential flow in the same direction as the impeller 2, thus eliminating pre-swirling flow.

[0034] When the high-speed fluid ejected by the impeller 2 passes through the outlet 101 with a gradually expanding cross-sectional area, the fluid is guided to flow smoothly by the guide ribs 103, which suppresses the generation of eddies, reduces energy loss, and further improves the stability of the output pressure.

[0035] When the spiral constant pressure pump is working, it will vibrate. At this time, the pump casing 1 is installed on the upper end of the fixed connecting block 33, and the vibration force will act on the fixed connecting block 33. Since the fixed connecting block 33 can slide along the side wall of the receiving recess 320, it can effectively absorb the vibration energy in the horizontal direction of the pump casing 1. At the same time, since the bottom end of the fastening ring 330 is connected to the upper end of the sliding buffer seat 32 through the buffer spring rod 332, when the fastening ring 330 and the fixed connecting block 33 move synchronously, the buffer spring rod 332 forms a nonlinear damping characteristic in the vertical direction, which further buffers and absorbs the vibration energy. The inner wall of the annular sliding plate 333 is slidably connected to the outer wall of the sliding buffer seat 32 through the sliding block 334, providing precise guidance for the sliding process, avoiding the pump casing 1 from tilting or shifting during vibration, and ensuring the relative position stability of each component.

[0036] Example 2: This example differs from Example 1 in that:

[0037] The fixing bolts 30 are arranged in a circumferentially evenly distributed manner. The angle between the center line of adjacent fixing bolts 30 and the axis of pump shaft 20 is 45°, and the preload of fixing bolts 30 deviates by 2%.

Claims

1. A low-vibration, high-lift, constant-pressure spiral pump, characterized in that, The pump casing (1) includes two oppositely interlocked pump housings forming a spiral mounting cavity (10) inside, an impeller (2) horizontally mounted in the spiral mounting cavity (10) via a pump shaft (20), and a buffer base (3) mounted at the bottom of the pump housing (1). The pump shaft (20) is supported at both ends by angular contact ball bearings (4). The side wall of the spiral mounting cavity (10) is provided with a gradually expanding inlet (100) in the shape of a trumpet and a spirally diffused outlet (101). The inner wall of the inlet (100) is evenly distributed with several guide vanes (102) along the circumference. The inner wall of the outlet (101) is provided with streamlined wing-shaped guide ribs (103). The buffer base (3) is fixedly connected to the external ground by fixing bolts (30).

2. The low-vibration, high-lift screw constant-pressure pump according to claim 1, characterized in that, The buffer base (3) includes a mounting base plate (31), a sliding buffer seat (32) located on the upper end of the mounting base plate (31) and having a receiving notch (320) at the center, and a fixed connecting block (33) with a snap ring (330) on the outer periphery of the upper wall and a sliding strip (331) on the lower wall slidably connected to the side wall of the receiving notch (320). The bottom end of the snap ring (330) is connected to the upper end of the sliding buffer seat (32) through a buffer spring rod (332), and the bottom end of the pump housing (1) is connected to the fixed connecting block (33).

3. The low-vibration, high-lift screw constant-pressure pump according to claim 2, characterized in that, The bottom end of the fastening ring (330) and the periphery of the sliding buffer seat (32) are provided with an annular sliding plate (333). The inner wall of the annular sliding plate (333) is slidably connected to the outer wall of the sliding buffer seat (32) through a sliding block (334).

4. A low-vibration, high-lift screw constant-pressure pump according to claim 2, characterized in that, An elastic buffer pad (335) is laid at the bottom of the fixed connecting block (33).

5. A low-vibration, high-lift screw constant-pressure pump according to claim 2, characterized in that, The fixing bolts (30) are evenly arranged around the circumference of the mounting base plate (31), the angle between the center line of adjacent fixing bolts (30) and the axis of the pump shaft (20) is 30° to 45°, and the preload deviation of the fixing bolts (30) is ≤3%.

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