Impeller box assembly, impeller box assembly design method, and water meter

Abstract

The application provides a vane box assembly, a vane box assembly design method and a water meter, and relates to the technical field of water meters.The vane box assembly provided by the application adopts a coaxial arrangement mode of a flow guide and a vane box body, the vane box body has a plurality of blades, the plurality of blades are arranged at intervals in the circumferential direction, and a water inlet is formed between any two adjacent blades, a flow guide surface is formed by a guide line as a generatrix and winding around the axis of the vane box body, the guide line is inclined from one end away from the vane box body to one end close to the vane box body in a direction away from the axis of the vane box body, the fluid can be uniformly dispersed to each water inlet along the flow guide surface, the flow field distribution of the water inlet is ensured to be uniform, the eccentric force borne by the vane box assembly is reduced, the flow performance is improved, and the abrasion in the rotation of the vane box assembly is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water meters, in particular to a vane box assembly, a vane box assembly design method and a water meter. BACKGROUND

[0002] The water meter has a complex internal structure, and the water flow state is irregular. Even if the vane box itself has a completely symmetrical structure, the water flow from each water inlet of the vane box cannot be guaranteed to be uniform, thereby causing the driving force received by the vane to be unevenly distributed in the circumferential direction, the dynamic balance to be damaged, the vane to rotate eccentrically, the flow characteristics to decrease, the wear to increase, and the service life to be affected.

[0003] Under normal circumstances, the vane dynamic balance performance can only be improved by improving the vane machining precision and optimizing the water meter cavity shell structure, but this will result in a substantial increase in the design and manufacturing cost of the water meter, and the flow performance of the water meter is difficult to simulate and verify. SUMMARY

[0004] The present application aims to provide a vane box assembly, a vane box assembly design method and a water meter to alleviate the technical problems of poor dynamic balance performance and severe wear of the vane box assembly in the prior art.

[0005] In a first aspect, the present application provides a vane box assembly, comprising: a vane box body and a flow guide.

[0006] The vane box body has a plurality of vanes, and the plurality of vanes are arranged at intervals in the circumferential direction and form a water inlet between any two adjacent vanes.

[0007] The flow guide is coaxially arranged with the vane box body, and the flow guide has a flow guide surface facing away from the vane box body.

[0008] The flow guide surface is formed by a guide line as a generatrix and winding around the axis of the vane box body.

[0009] The guide line is inclined from one end away from the vane box body to one end close to the vane box body in a direction away from the axis of the vane box body.

[0010] In combination with the first aspect, the present application provides a first possible implementation manner of the first aspect, wherein the guide line is configured as an arc concave to the direction close to the axis of the vane box body.

[0011] In combination with the first aspect, the present application provides a second possible implementation manner of the first aspect, wherein the plurality of vanes are connected to a disc part, and the plurality of vanes respectively extend from one end connected to the disc part to a direction away from the axis of the disc part.

[0012] With reference to the second possible implementation manner of the first aspect, the present application provides a third possible implementation manner of the first aspect, wherein, in a projection plane perpendicular to the impeller box body axis, the circumference of the wheel disc part coincides with the outer circle of the guide surface.

[0013] With reference to the second possible implementation manner of the first aspect, the present application provides a fourth possible implementation manner of the first aspect, wherein, in a projection plane perpendicular to the impeller box body axis, the diameter of the wheel disc part is greater than the outer circle diameter of the guide surface.

[0014] In the second aspect, the present application provides a water meter configured with the impeller box assembly as described in the first aspect.

[0015] In the third aspect, the present application provides an impeller box assembly design method, comprising the following steps:

[0016] An impeller box assembly model is established, in which the impeller box body and the guide member are coaxially arranged, the impeller box body has a plurality of blades, the plurality of blades are arranged at intervals in the circumferential direction, and a water inlet is formed between any two adjacent blades;

[0017] A guide surface is configured on the guide member, the guide surface is taken as a generatrix and formed by winding the generatrix around the axis of the impeller box body, and the generatrix is inclined away from the axis of the impeller box body from one end far away from the impeller box body to one end close to the impeller box body.

[0018] With reference to the third aspect, the present application provides a first possible implementation manner of the third aspect, wherein the impeller box assembly design method further comprises:

[0019] The radial force borne by the impeller box body is simulated and verified, and a phase diagram of the circumferential distribution of the radial force borne by the impeller box body is drawn;

[0020] The dynamic balance performance of the impeller box assembly model is analyzed.

[0021] With reference to the first possible implementation manner of the second aspect, the present application provides a second possible implementation manner of the second aspect, wherein the impeller box assembly design method further comprises:

[0022] The slope or arc of the guide line is adjusted until the radial force borne by the impeller box body is within a preset range.

[0023] With reference to the third aspect, the present application provides a third possible implementation manner of the third aspect, wherein the impeller box assembly design method further comprises:

[0024] The rotational speed of the impeller box assembly model is simulated and calculated, and the flow performance at a preset flow point is converted;

[0025] Adjust the slope or arc of the guide line until the flow performance of the preset flow point meets the preset requirement.

[0026] The present application embodiment brings the following beneficial effects: the flow guide piece is coaxially arranged with the impeller box body, the impeller box body has a plurality of blades, the plurality of blades are arranged at intervals in the circumferential direction, and a water inlet is formed between any two adjacent blades, the guide surface is formed by the guide line as a generatrix and winding around the axis of the impeller box body, the guide line is inclined from the end away from the impeller box body to the end close to the impeller box body in a direction away from the axis of the impeller box body, which can make the fluid evenly dispersed to each water inlet along the guide surface, thereby ensuring uniform distribution of the flow field of the water inlet, reducing the eccentric force on the impeller box assembly, and thereby improving the flow performance and reducing the wear during rotation of the impeller box assembly.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the specific embodiments or related art, the following will briefly introduce the drawings needed to be used in the specific embodiments or related art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings without creative labor based on these drawings.

[0029] Figure 1 An exploded view of the impeller box assembly provided by the present application embodiment;

[0030] Figure 2 A schematic view of the impeller box assembly provided by the present application embodiment;

[0031] Figure 3 A front view of the impeller box assembly provided by the present application embodiment;

[0032] Figure 4 A fluid domain simulation schematic diagram of the impeller box assembly model in the impeller box assembly design method provided by the present application embodiment;

[0033] Figure 5 A comparison diagram of the radial force on the impeller box with and without the flow guide piece.

[0034] Legend: 01 - fluid domain grid; 02 - impeller rotation domain grid; 100 - impeller box body; 101 - blade; 102 - water inlet; 103 - disc part; 200 - flow guide piece; 201 - guide line; 210 - guide surface. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only used to describe the name difference, and cannot be understood as indicating or implying relative importance. The physical quantities in the formula, such as no separate marking, should be understood as the basic quantity of the international system of units, or the derived quantity derived from the basic quantity by multiplication, division, differentiation or integration, etc. Mathematical operation.

[0037] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] As shown in Figure 1 , Figure 2 and Figure 3 , the impeller box assembly provided by the embodiments of the present application comprises: an impeller box body 100 and a flow guide 200; the impeller box body 100 has a plurality of blades 101, the plurality of blades 101 are arranged at intervals in the circumferential direction, and a water inlet 102 is formed between any two adjacent blades 101; the flow guide 200 is coaxially arranged with the impeller box body 100, and the flow guide 200 has a flow guide surface 210 facing away from the impeller box body 100; the flow guide surface 210 is formed by winding the guide line 201 around the axis of the impeller box body 100 with the guide line 201 as the generatrix; the guide line 201 is inclined to the direction away from the axis of the impeller box body 100 from one end away from the impeller box body 100 to one end close to the impeller box body 100.

[0039] The above-mentioned impeller box assembly is used for fluid domain simulation calculation of fluid domain, and the grid density is used to represent the fluid distribution, and the results are as shown in Figure 4The fluid domain simulation diagram is shown. The fluid domain grid 01 is uniformly distributed along the circumference of the impeller box body 100, and the plurality of impeller rotation domain grids 02 inside the impeller box body 100 are uniformly distributed along the circumference. Referring to Figure 1 、 Figure 2 and Figure 3 Under the guiding effect of the guide surface 210, the disturbance effect on the flow field can be reduced, the flow field distribution of each water inlet 102 is uniform, and the eccentric force on the impeller box body 100 is reduced, thereby the problem of increased wear of the impeller box assembly due to eccentricity during rotation can be alleviated, the wear is reduced, and the service life of the impeller box assembly and the bearing matched therewith is prolonged.

[0040] In the embodiment of the present application, the guide line 201 is configured as an arc line recessed towards the direction close to the axis of the impeller box body 100. The water flow field is distributed along the circumference of the guide surface 210, and the water flow flows along the guide line 201 in the direction gradually away from the axis of the impeller box body 100. On the one hand, the flow field is uniformly distributed along the circumference of the impeller box body 100, and on the other hand, the flow rate of the fluid in the axial direction of the impeller box body 100 is reduced, the impact of the fluid on the impeller box body 100 is reduced, and the flow performance of the impeller box assembly is improved.

[0041] As shown in Figure 1 In an optional embodiment, the plurality of blades 101 are connected to the disc portion 103, and the plurality of blades 101 extend from one end of the disc portion 103 in a direction away from the axis of the disc portion 103.

[0042] The disc portion 103 is configured as a circular structure, and the plurality of blades 101 and the disc portion 103 are configured as an integral structure.

[0043] In one embodiment, on the projection plane perpendicular to the axis of the impeller box body 100, the circumference of the disc portion 103 coincides with the outer circle of the guide surface 210. The water flow after flowing through the guide surface 210 can be uniformly distributed into the plurality of water inlets 102, the kinetic energy loss of the fluid is small, and the flow performance is better.

[0044] In another embodiment, on the projection plane perpendicular to the axis of the impeller box body 100, the diameter of the disc portion 103 is greater than the diameter of the outer circle of the guide surface 210. The water flow after flowing through the guide surface 210 can continue to flow along the surface of the disc portion 103 in a direction away from the axis of the impeller box body 100, and then be dispersed into the plurality of water inlets 102.

[0045] The water meter provided by the embodiment of the present application is configured with the impeller box assembly described in the above embodiments.

[0046] The design method of the impeller box assembly provided by the embodiment of the present application includes the following steps:

[0047] The impeller box assembly model is established with the impeller box body 100 and the flow guide 200 coaxially arranged. The impeller box body 100 has a plurality of blades 101, and the plurality of blades 101 are arranged at intervals in the circumferential direction and form a water inlet 102 between any two adjacent blades 101.

[0048] The flow guide surface 210 is arranged on the flow guide 200. The flow guide surface 210 is formed by the guide line 201 as a generatrix and is wrapped around the axis of the impeller box body 100. The guide line 201 is inclined away from the axis of the impeller box body 100 from one end away from the impeller box body 100 to one end close to the impeller box body 100.

[0049] In the impeller box assembly design method described in the embodiment, the fluent solver can be used, the unsteady pressure-based calculation method is selected, and the gravity direction and size (-9.8 m / s 2 ) are set. When the flow guide 200 is located directly below the impeller box body 100, the gravity direction is vertically downward along the axis of the impeller box body 100. The turbulent flow model is selected, the material of the calculation domain (the fluid medium is water) is set, and the boundary conditions are set according to the actual situation. The inlet is selected as a velocity-inlet, and the outlet is selected as an outflow. Then, the interface (the boundary between adjacent fluid domains) is generated. The grid of the simulated fluid is opened and the dynamic simulation is performed by using the six-degree-of-freedom (6DOF) algorithm. The impeller and the impeller rotating domain are set as rigid bodies, and the impeller rotating fluid domain is set as passive. The pressure-velocity coupling method (coupled algorithm) and the difference format (second-order upwind format) are selected. The force calculation UDF is imported and the monitoring (monitoring the impeller speed and the radial force component of the impeller) is set. Then, the initialization and the corresponding time step and calculation step are set, and the simulation calculation is started.

[0050] Further, the impeller box assembly design method further comprises: simulating and verifying the radial force of the impeller box body 100, drawing a phase diagram of the radial force along the circumferential direction of the impeller box body 100, and analyzing the dynamic balance performance of the impeller box assembly model.

[0051] In the post-processing process, the two mutually perpendicular components of the radial force of the impeller box assembly are taken as the horizontal and vertical coordinates to draw a phase diagram of the radial force of the impeller (see Figure 5 ). The radial force of the impeller box assembly with the flow guide 200 is closer to the coordinate origin, the radial force is smaller, the dynamic balance performance is better, and the flow performance and wear resistance are improved.

[0052] In an alternative embodiment, the impeller box assembly design method further comprises adjusting the slope or curvature of the guide line 201 until the radial force on the impeller box body 100 is within a predetermined range, so that the optimal guide line 201 profile can be obtained through multiple simulation tests.

[0053] In another alternative embodiment, the impeller box assembly design method further comprises simulating the rotational speed of the impeller box assembly model and calculating the flow performance at a predetermined flow point; adjusting the slope or curvature of the guide line 201 until the flow performance at the predetermined flow point meets the predetermined requirements. Several flow values can be used as test working condition standards, and the flow performance under each flow condition is tested correspondingly, so that the impeller box assembly meeting the flow performance requirements of the water meter is obtained.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An impeller box assembly, characterized in that, include: Impeller box body (100) and flow guide (200); The impeller box body (100) has a plurality of blades (101), which are spaced apart circumferentially and form an inlet (102) between any two adjacent blades (101); The flow guide (200) is coaxially arranged with the impeller box body (100), and the flow guide (200) has a flow guide surface (210) facing away from the impeller box body (100); The guide surface (210) is formed with the guide line (201) as the generatrix and the guide line (201) is formed around the axis of the impeller box body (100); The guide wire (201) deflects from one end away from the impeller box body (100) to the end near the impeller box body (100) in a direction away from the axis of the impeller box body (100).

2. The impeller box assembly according to claim 1, characterized in that, The guide line (201) is configured as an arc that is concave towards the axis of the impeller box body (100).

3. The impeller box assembly according to claim 1, characterized in that, The plurality of blades (101) are all connected to the wheel disk portion (103), and the plurality of blades (101) extend from one end connected to the wheel disk portion (103) in a direction away from the axis of the wheel disk portion (103).

4. The impeller box assembly according to claim 3, characterized in that, On the projection plane perpendicular to the axis of the impeller box body (100), the circumference of the disc portion (103) coincides with the outer ring of the guide surface (210).

5. The impeller box assembly according to claim 3, characterized in that, On the projection plane perpendicular to the axis of the impeller box body (100), the diameter of the disc portion (103) is larger than the outer diameter of the guide surface (210).

6. A water meter, characterized in that, The water meter is equipped with an impeller box assembly as described in any one of claims 1-5.

7. A design method for an impeller box assembly, characterized in that, Includes the following steps: An impeller box assembly model is established in which the impeller box body (100) and the flow guide (200) are coaxially arranged. The impeller box body (100) has multiple blades (101), which are spaced apart in the circumferential direction and form an inlet (102) between any two adjacent blades (101). A flow guide surface (210) is disposed on the flow guide (200). The flow guide surface (210) is formed with the guide line (201) as the generatrix and the guide line (201) is wrapped around the axis of the impeller box body (100). The guide line (201) is deflected from one end away from the impeller box body (100) to the other end close to the impeller box body (100) in a direction away from the axis of the impeller box body (100).

8. The impeller box assembly design method according to claim 7, characterized in that, The impeller box assembly design method further includes: The radial force on the impeller box body (100) was simulated and verified, and a phase diagram of the radial force distribution along the circumference of the impeller box body (100) was plotted. Analyze the dynamic balance performance of the impeller box assembly model.

9. The impeller box assembly design method according to claim 8, characterized in that, The impeller box assembly design method further includes: Adjust the slope or curvature of the guide line (201) until the radial force on the impeller box body (100) is within a preset range.

10. The impeller box assembly design method according to claim 7, characterized in that, The impeller box assembly design method further includes: The rotational speed of the impeller box assembly model is simulated and calculated, and the flow performance is converted at a preset flow point; Adjust the slope or curvature of the guide line (201) until the flow performance of the preset flow point meets the preset requirements.

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