Asymmetric double-volute structure and cantilever type pump comprising same
By designing an asymmetrical flow channel structure to generate controllable residual radial force, the weight of the cantilever pump rotor is offset, solving the problem that the traditional double volute structure cannot balance the rotor weight. This achieves greater stability and reduced static deflection, extending the pump's service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-03-27
AI Technical Summary
The traditional double volute structure cannot effectively counteract the static deflection caused by the rotor weight in cantilever pumps, affecting the pump's operational stability and increasing vibration and noise.
The design incorporates two asymmetrical flow channels to generate a controllable residual radial force to offset the rotor weight. An asymmetrical double volute structure is employed, comprising a first flow channel and a second flow channel. The volute length of the second flow channel is longer than that of the first flow channel, with the extended portion extending below the pump body. The magnitude and direction of the residual radial force are controlled by adjusting the flow channel geometry parameters.
Improve the operational stability of cantilever pumps, reduce vibration and noise, and extend their service life.
Smart Images
Figure CN224049423U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of double volute structure and cantilever pump, specifically to a kind of asymmetric double volute structure by designing two asymmetric flow channels, produce controllable residual radial force, offset rotor weight, reduce rotor static deflection, improve the operating stability of pump, and a kind of cantilever pump can effectively reduce vibration and noise, prolong the service life of pump. BACKGROUND
[0002] In centrifugal pump, double volute structure is often used to balance radial force, reduce bearing load and prolong the service life of pump. The traditional double volute structure usually adopts symmetrical design to achieve complete balance of radial force. However, in cantilever pump, due to its cantilever structure, it is more sensitive to rotor weight compared to two-end support structure. When the rotor weight is too large, it will cause the rotor shaft to produce a large static deflection, affecting the operating stability of the pump, increasing vibration and noise, and even causing mechanical failure.
[0003] In the prior art, although the double volute structure can balance the radial force, the symmetrical design cannot offset the static deflection problem caused by the rotor weight. Therefore, a new volute structure design is needed, which can balance the radial force while offsetting the rotor weight, reducing the static deflection and improving the operating stability of the pump. SUMMARY
[0004] To solve the above problems, the main purpose of the utility model is to provide an asymmetric double volute structure by designing two asymmetric flow channels, producing controllable residual radial force, offsetting rotor weight, reducing rotor static deflection, improving the operating stability of pump, and a kind of cantilever pump can effectively reduce vibration and noise, prolong the service life of pump.
[0005] The utility model solves the above technical problems by the following technical scheme: an asymmetric double volute structure, comprising: two asymmetric flow channels, the two flow channels are first flow channel and second flow channel, the two flow channels are separated by a partition, wherein the volute length of the second flow channel is longer than the volute length of the first flow channel, and the excess part is below the pump body.
[0006] In the specific embodiment of the utility model, the excess part of the volute length of the second flow channel over the first flow channel is L=T*13.6 / (D*H*g*ρ),
[0007] L-imbalance length
[0008] D-second flow channel width
[0009] g-gravitational acceleration
[0010] ρ-medium density
[0011] H-lift
[0012] T-weight of the cantilever in the cantilever pump with the asymmetric double volute structure.
[0013] In the specific embodiment of the utility model, the partition plate and the pump body are integrally cast.
[0014] In the specific embodiment of the utility model, the second flow channel width ranges from 20 to 200 mm.
[0015] In the specific embodiment of the utility model, the outlet angle of the first flow channel ranges from 10 to 15 degrees.
[0016] In the specific embodiment of the utility model, the outlet angle of the second flow channel ranges from 16 to 20 degrees.
[0017] A cantilever pump adopts the asymmetric double volute structure, and the cantilever centrifugal pump comprises a pump body and a pump cover which are fastened by bolts and are designed in an asymmetric double volute structure, an impeller is mounted on a shaft, and the shaft is supported by two bearings of a bearing box.
[0018] The utility model discloses an asymmetric double volute structure and a cantilever pump comprising the structure, which have the following advantages compared with common technology: the utility model discloses an asymmetric double volute structure design, which can generate controllable residual radial force, offset rotor weight and reduce rotor static deflection.
[0019] The utility model discloses simple structure, easy to manufacture and maintain, is applicable to a variety of working conditions. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is the whole structure schematic drawing of asymmetric double volute structure that the utility model discloses proposes.
[0021] Figure 2 It is the schematic diagram that asymmetric double volute structure that the utility model discloses proposes is applied in cantilever pump.
[0022] Figure 3 It is the area of cantilever calculation weight in the utility model.
[0023] The following is the name corresponding to the mark in the utility model:
[0024] Pump body 1, impeller 2, pump cover 3, bearing box 4, shaft 5, first flow channel 6, second flow channel 7, unbalance length 8, first flow channel volute wall 9, second flow channel volute wall 10. DETAILED DESCRIPTION
[0025] The preferable embodiments of the utility model are shown in combination with the drawings to specifically explain the technical scheme of the utility model.
[0026] Figure 1 The whole structure schematic diagram of the asymmetric double volute structure provided by the utility model is shown in the figure, Figure 1 As shown in the figure, the utility model provides an asymmetric double volute structure, which comprises two asymmetric flow channels, the two flow channels are respectively a first flow channel 6 and a second flow channel 7, the two flow channels are separated by a partition, wherein the volute length of the second flow channel is longer than that of the first flow channel, and the overhanging part is below the pump body, the partition and the pump body 1 in the utility model are integrally cast. Figure 1 The first flow channel volute wall surface is marked 9, and the second flow channel volute wall surface is marked 10.
[0027] In the specific implementation process, the volute length of the second flow channel in the utility model is longer than the first flow channel by L, the overhanging part is the balance length 8, L=T*13.6 / (D*H*g*ρ),
[0028] Wherein: L-imbalance length
[0029] D-second flow channel width
[0030] g-gravitational acceleration
[0031] ρ-medium density
[0032] H-lift
[0033] T-the cantilever weight in the cantilever pump where the asymmetric double volute structure is installed, see Figure 3 .
[0034] In the specific implementation process of the utility model, the range of the second flow channel width is: 20-200mm, the outlet angle range of the first flow channel is: 10-15°, and the outlet angle range of the second flow channel is: 16-20°. The above parameters can be adjusted to other ranges or values according to specific requirements.
[0035] The utility model also provides a cantilever type pump, which adopts the above asymmetric double volute structure, and the cantilever type centrifugal pump comprises: a pump body 1 and a pump cover 3 designed by the asymmetric double volute structure are fastened by bolts, an impeller 2 is mounted on a shaft 5, and the shaft 5 is supported by two bearings of a bearing box body 4.
[0036] The utility model provides an asymmetric double volute structure, which offsets the rotor weight of the cantilever type pump by designing the direction of residual radial force, reduces the rotor static deflection, and improves the operation stability of the pump.
[0037] The volute is composed of two asymmetric flow channels, which are a first flow channel and a second flow channel.
[0038] The first flow channel and the second flow channel have different cross-sectional areas, shapes and flow channel lengths, so that the pressure distribution of the fluid in the flow channel is uneven, thereby generating residual radial force, and the direction of the residual radial force is designed to be opposite to the direction of the rotor gravity, so as to offset the rotor weight and reduce the static deflection of the rotor shaft.
[0039] By adjusting the geometric parameters (cross-sectional area and flow channel length) of the first flow channel and the second flow channel, the size and direction of the residual radial force are controlled, the length of the volute of the second flow channel is longer than that of the first flow channel, and the protruding part is below the pump body, Figure 1 the position of the unbalanced length generates upward radial force, which is opposite to the direction of the rotor gravity and matches the rotor weight in size, so as to achieve the best offset effect.
[0040] Figure 2 The asymmetric double-volute structure is particularly suitable for cantilever pumps, can effectively reduce the static deflection of the rotor shaft, and improve the operation stability of the pump.
[0041] The asymmetric double-volute structure can reduce the static deflection, reduce the bearing load, prolong the service life of the pump, and reduce vibration and noise.
[0042] The asymmetric double-volute structure can reduce the static deflection, reduce the bearing load, prolong the service life of the pump, and reduce vibration and noise.
[0043] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made without departing from the spirit and scope of the utility model. These changes and improvements all fall within the scope of the claimed utility model, and the scope of protection of the utility model is defined by the appended claims and their equivalents.
Claims
1. An asymmetric double volute structure, characterized by: The asymmetric double volute structure comprises two asymmetric flow channels, i.e. a first flow channel and a second flow channel, which are separated by a partition, wherein the volute length of the second flow channel is longer than that of the first flow channel, and the overhanging part is below the pump body.
2. The asymmetric twin-volute structure according to claim 1, characterized in that: The overhanging part of the second flow channel compared with the first flow channel is L=T*13.6 / (D*H*g*ρ), L-imbalance length D-width of the second flow channel g-gravitational acceleration ρ-density of medium H-lift T-weight of the cantilever in the cantilever pump in which the asymmetric double volute structure is installed.
3. The asymmetric twin-volute structure according to claim 1, characterized in that: The partition is integrally cast with the pump body.
4. The asymmetric twin-volute configuration of claim 1, wherein: The width of the second flow channel ranges from 20 to 200 mm.
5. The asymmetric twin-volute configuration of claim 1, wherein: The outlet angle of the first flow channel ranges from 10 to 15°.
6. The asymmetric twin-volute configuration of claim 1, wherein: The outlet angle of the second flow channel ranges from 16 to 20°.
7. A cantilevered pump characterized by: The cantilever pump adopts the asymmetric double volute structure according to any one of claims 1-6, and comprises a pump body and a pump cover which are fastened by bolts, an impeller which is mounted on a shaft, and the shaft which is supported by two bearings of a bearing box.