Flow adjusting structure of water meter

Abstract

The flow adjusting structure comprises an impeller box and a flow adjusting piece, the flow adjusting piece is connected to the bottom of the impeller box, a cavity is formed in the flow adjusting piece, compressed air is packaged in the cavity, and the flow guide face of the flow adjusting piece is in a horn shape and is large in upper portion and small in lower portion. The flow adjusting piece has the advantages that the flow guiding face is in a horn shape under the supporting effect of compressed air packaged in the cavity, the upper portion of the flow guiding face is large, and the lower portion of the flow guiding face is small, and under the condition of water pressure fluctuation, the compressed air is compressed or diffused to firstly adjust the curved surface radian of the flow guiding face; a flow guiding and automatic adjusting function is achieved on a water flow field entering a water inlet of the impeller box, and automatic adjustment of a flow error curve under different water pressure conditions is completed; and under the condition that the air temperature is low during freezing, the air pressure in the cavity is reduced to automatically contract, and the cavity is further compressed under the extrusion of freezing expansion force to form an expansion space required by freezing, so that the extrusion of ice on the shell of the water meter is eliminated, and the water meter is prevented from frost cracking.

Description

Technical Field

[0001] The invention relates to the technical field of water meter flow calibration structures, in particular to a water meter flow regulating structure. Background Art

[0002] The water meter is a water metering instrument. The metering mechanism of the multi-jet water meter is mainly composed of an impeller box, an impeller, and an impeller shaft. The metering accuracy of the multi-jet water meter depends largely on the structure and form of the impeller box. Since the impeller box of the current multi-jet water meter is formed by injection molding of hard plastic, it helps to maintain the stability of the inlet and outlet of the impeller box. At present, the multi-jet water meter without external adjustment adjusts the flow characteristics of the water meter by adjusting the relative position of the impeller box and the gear box. To adjust the relative position of the impeller box and the gear box, the water meter needs to be disassembled for adjustment. There is a lack of means to adjust the flow error of the multi-jet water meter under different water pressures.

[0003] Therefore, when the pressure in the pipeline fluctuates, the water meter itself cannot adjust the flow characteristics due to the pressure fluctuation. Since the water pressure in the pipeline has a certain influence on the flow characteristics of the multi-jet water meter, how to achieve automatic adjustment of the influence of water pressure on the multi-jet water meter by changing the impeller box structure is currently a hot topic in the research and development of this type of water meter.

[0004] At the same time, multi-jet water meters often freeze and crack due to ice formation inside the meters in cold weather, which urgently needs to be improved. Summary of the invention

[0005] A technical problem to be solved by the present application is to overcome the defects of the above related technologies and provide a flow regulating structure of a water meter with an antifreeze function.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a flow regulating structure of a water meter, including an impeller box and a flow regulating component, the flow regulating component is connected to the bottom of the impeller box, a cavity is provided in the flow regulating component, compressed air is encapsulated in the cavity, the guide surface of the flow regulating component is trumpet-shaped and is larger at the top and smaller at the bottom, and the thickness of the guide surface part of the flow regulating component is less than the thickness of other parts.

[0007] Compared with the related art, the present application has the following advantages: it draws on the method of adding an adjustment plate at the bottom of the impeller box of a conventional water meter to adjust the flow characteristics of the water meter, and adds a cavity in the flow regulating member, in which compressed air is encapsulated. The compressed air supports the guide surface, so that the guide surface of the flow regulating member is trumpet-shaped under normal water pressure and is larger at the top and smaller at the bottom. Under water pressure fluctuations, the compressed air in the cavity is compressed or diffused. Since the thickness of the guide surface part of the flow regulating member is less than the thickness of other parts, the first thing to be adjusted is the curvature of the curved surface of the guide surface, which plays an automatic diversion adjustment function for the flow field entering the water inlet of the impeller box, and completes the automatic adjustment of the flow error curve under different water pressure conditions; and when the temperature is low during freezing, the air pressure in the cavity decreases and automatically contracts, and the cavity can be further compressed under the extrusion of the ice expansion force to form the expansion space required for freezing, eliminating the extrusion of ice on the water meter shell, thereby preventing the water meter from freezing and cracking.

[0008] As an improvement, a guide column extending downward is provided in the middle of the bottom of the impeller box, and a guide keyway is provided in the middle of the flow regulating member, and the guide keyway is sleeved outside the guide column and fits with the guide column; the upper part of the guide column is a cylinder, and the lower part of the guide column is a cross-shaped column, and an annular rib is provided on the cylinder; an annular groove is provided on the hole wall of the guide keyway; and the annular rib is embedded in the annular groove. It is convenient for the installation and positioning of the flow regulating member and the impeller box, and the cross-shaped column can also eliminate the rotation of the flow regulating member under the force of the water flow on the positive rotation guide rib or the reverse rotation guide rib; the annular rib is embedded in the annular groove, which can effectively prevent the flow regulating member from separating from the impeller box.

[0009] As an improvement, the guide surface is provided with a plurality of circumferentially distributed positive rotation guide ribs or reverse rotation guide ribs. In the case of positive rotation guide ribs, after the water flows into the meter case from the water inlet of the water meter, under the guidance of the guide surface and the positive rotation guide ribs, the water flows into a positive rotation direction, thereby increasing the water flow velocity entering the impeller box water inlet, making the overall flow curve biased to positive, playing a role in regulating the flow error curve; in the case of reverse rotation guide ribs, after the water flows into the meter case from the water inlet of the water meter, under the guidance of the guide surface and the reverse rotation guide ribs, the water flows into a reverse rotation direction, thereby reducing the water flow velocity entering the impeller box water inlet, making the overall flow curve biased to negative, playing a role in regulating the flow error curve.

[0010] Preferably, the thickness of the positive rotation guide rib or the reverse rotation guide rib protruding from the guide surface is less than or equal to the thickness of the guide surface portion.

[0011] Preferably, the rotation angle of the forward-rotating guide ribs or the reverse-rotating guide ribs is 10 to 90 degrees.

[0012] Optimally, the rotation angle of the forward-rotating guide ribs or the reverse-rotating guide ribs is 30 to 60 degrees. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional schematic diagram of Example 1.

[0014] Figure 2 It is a cross-sectional schematic diagram of Example 1.

[0015] Figure 3 This is an exploded view of Example 1.

[0016] Figure 4 It is a stereoscopic schematic diagram of Example 2.

[0017] Figure 5 It is a three-dimensional schematic diagram of Example 3. DETAILED DESCRIPTION

[0018] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0019] Example 1

[0020] In this embodiment, Figures 1 to 3 The flow regulating structure of a water meter is shown, including an impeller box 1 and a flow regulating member 2, wherein the flow regulating member 2 is connected to the bottom of the impeller box 1, and the upper plane of the flow regulating member 2 is in contact with the bottom surface of the impeller box 1. The flow regulating member 2 is provided with a cavity 2.1 which is compressed inward when the water freezes and expands to prevent the water meter from freezing and cracking, and the thickness of the guide surface of the flow regulating member 2 is less than the thickness of other parts. The flow regulating member 2 is made of hard rubber or thermoplastic elastomer, and its hardness range is 70-95 degrees Shore, and the optimal is 92 degrees Shore; compressed air is encapsulated in the cavity 2.1, and the compressed air supports the guide surface. Under the support of compressed air, the guide surface is trumpet-shaped under normal water pressure and is larger at the top and smaller at the bottom, and the cross-sectional curve of the guide surface is a parabola.

[0021] In case of water pressure fluctuation, the compressed air in the cavity 2.1 will be automatically compressed or diffused. Since the thickness of the guide surface is less than that of other parts, the corresponding stress is minimal, so the curvature of the guide surface is automatically adjusted first, which plays an automatic diversion adjustment function on the flow field of the water entering the water inlet of the impeller box.

[0022] In this embodiment, a guide column 1.1 is provided in the middle of the bottom of the impeller box 1, and a guide keyway 2.2 is provided in the middle of the flow regulating member 2. The guide keyway 2.2 is sleeved outside the guide column 1.1 and fits with the guide column 1.1. The upper part of the guide column 1.1 is a cylinder 1.2, and the lower part of the guide column 1.1 is a cross column 1.3, and an annular rib 1.4 is provided on the cylinder 1.2; an annular groove (not shown in the figure) is provided on the hole wall of the guide keyway 2.2, and the annular rib 1.4 is embedded in the annular groove. The flow regulating member 2 and the impeller box 1 can be quickly plugged and fixed.

[0023] Example 2

[0024] In this embodiment, Figure 4 The flow regulating structure of a water meter is shown, which is basically the same as that of Example 1, except that: a plurality of circumferentially distributed positive rotation guide ribs 2.3 are provided outside the guide surface. The rotation direction of the positive rotation guide rib 2.3 is the same as the rotation direction of the water flow entering the impeller box 1. The thickness of the positive rotation guide rib 2.3 protruding from the guide surface is less than or equal to the thickness of the guide surface portion. The positive rotation guide rib 2.3 can increase the structural strength of the guide surface and reduce the deformation of the guide surface, and therefore should not be too thick. The rotation angle of the positive rotation guide rib 2.3 is 10 degrees to 90 degrees, which is adjusted as needed. The rotation angle of the positive rotation guide rib 2.3 is usually 30 degrees to 60 degrees.

[0025] Example 3

[0026] In this embodiment, Figure 5 The structure of a flow regulating device of a water meter is shown, which is basically the same as that of Example 1, except that: a plurality of circumferentially distributed anti-rotation guide ribs 2.4 are provided outside the guide surface. The direction of rotation of the anti-rotation guide ribs 2.4 is opposite to the direction of rotation of the water flow entering the impeller box 1. The thickness of the anti-rotation guide ribs 2.4 protruding from the guide surface is less than or equal to the thickness of the guide surface portion. The anti-rotation guide ribs 2.4 can also increase the structural strength of the guide surface and reduce the deformation of the guide surface, so they should not be too thick. The rotation angle of the anti-rotation guide ribs 2.4 is 10 to 90 degrees, which is adjusted as needed. The rotation angle of the anti-rotation guide ribs 2.4 is usually 30 to 60 degrees.

[0027] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A flow regulating structure of a water meter, comprising an impeller box and a flow regulating member, wherein the flow regulating member is connected to the bottom of the impeller box, and is characterized in that: The flow regulating member has a cavity therein, compressed air is encapsulated in the cavity, the flow guiding surface of the flow regulating member is trumpet-shaped and is larger at the top and smaller at the bottom, and the thickness of the flow guiding surface portion of the flow regulating member is smaller than the thickness of other portions.

2. A flow regulating structure of a water meter according to claim 1, characterized in that: A guide column extending downward is provided in the middle of the bottom of the impeller box, and a guide keyway is provided in the middle of the flow regulating member, and the guide keyway is sleeved outside the guide column and fits with the guide column; the upper part of the guide column is a cylinder, the lower part of the guide column is a cross-shaped column, and an annular rib is provided on the cylinder; an annular groove is provided on the hole wall of the guide keyway, and the annular rib is embedded in the annular groove.

3. A flow regulating structure of a water meter according to claim 2, characterized in that: A plurality of circumferentially distributed positive rotation guide ribs or counter-rotation guide ribs are arranged outside the guide surface.

4. A flow regulating structure of a water meter according to claim 3, characterized in that: The thickness of the positive rotation guide rib or the reverse rotation guide rib protruding from the guide surface is less than or equal to the thickness of the guide surface portion.

5. A flow regulating structure of a water meter according to claim 3 or 4, characterized in that: The rotation angle of the positive rotation guide rib or the reverse rotation guide rib is 10 degrees to 90 degrees.

6. A flow regulating structure of a water meter according to claim 5, characterized in that: The rotation angle of the positive rotation guide rib or the reverse rotation guide rib is 30 degrees to 60 degrees.

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