Flow adjusting structure of water meter

Abstract

The utility model discloses a flow regulating structure of a water meter, which comprises an impeller box and a flow regulating part, the flow regulating part is connected to the bottom of the impeller box, a cavity is arranged in the flow regulating part, compressed air is packaged in the cavity, and a flow guide surface of the flow regulating part is trumpet-shaped and has a large upper part and a small lower part. The utility model has the following advantages: the flow guide surface of the flow regulating part is trumpet-shaped under the supporting action of compressed air packaged in the cavity and is large in top and small in bottom, and the compressed air in the cavity is compressed or diffused under the condition of water pressure fluctuation, so that the curved surface radian of the flow guide surface is regulated, and a flow guide automatic regulating function is realized on a water flow field entering the water inlet of the impeller box; 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 on the shell of the water meter is eliminated, and the water meter is prevented from being frozen to crack.

Description

Technical Field

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

[0002] A water meter is an instrument for measuring water usage. The metering mechanism of a multi-jet water meter primarily consists of an impeller box, an impeller, and an impeller shaft. The metering accuracy of a multi-jet water meter depends largely on the structure and form of the impeller box. Currently, the impeller box of multi-jet water meters is injection-molded from hard plastic, which helps maintain the stability of the impeller box's inlet and outlet. Currently, multi-jet water meters without external adjustments adjust the meter's flow characteristics by adjusting the relative position of the impeller box and gear box. However, adjusting the relative position of the impeller box and gear box requires disassembling the water meter, and there is no means to adjust the flow error of the multi-jet water meter under different water pressures.

[0003] Therefore, when pressure fluctuates within the pipe, the water meter itself cannot adjust the flow characteristics due to the pressure fluctuation. Since the water pressure within the pipe has a certain impact on the flow characteristics of multi-jet water meters, how to automatically adjust the water pressure 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, in cold weather, multi-stream water meters often experience ice formation inside the meters, leading to cracks, which urgently needs improvement. Utility Model Content

[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 anti-freezing function.

[0006] The technical solution adopted by the utility model to solve the technical problem is: a flow regulating structure of a water meter, including an impeller box and a flow regulating member, the flow regulating member is connected to the bottom of the impeller box, a cavity is provided in the flow regulating member, compressed air is encapsulated in the cavity, and the guide surface of the flow regulating member is trumpet-shaped and is larger at the top and smaller at the bottom.

[0007] Compared with the related art, the present application has the following advantages: drawing on the method of adding an adjustment plate at the bottom of the impeller box to adjust the flow characteristics of the water meter in conventional water meters, a cavity is added in the flow adjustment component, and compressed air is encapsulated in the cavity. The compressed air supports the guide surface, so that the guide surface of the flow adjustment component is improved to a trumpet shape with a larger upper part and a smaller lower part. When the water pressure fluctuates, the compressed air in the cavity is compressed or diffused, thereby adjusting the curvature of the guide surface, and playing an automatic diversion adjustment function for the flow field entering the water inlet of the impeller box, completing 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 is further compressed under the extrusion of the ice expansion force to form the expansion space required for freezing, eliminating the extrusion of the water meter shell, thereby preventing the water meter from freezing and cracking.

[0008] Preferably, the guide surface is provided with a plurality of circumferentially distributed forward-rotating guide ribs or reverse-rotating guide ribs. In the case of forward-rotating guide ribs, after the water flows into the meter case from the water inlet of the water meter, the water flows in a forward-rotating direction under the guidance of the guide surface and the forward-rotating guide ribs, thereby increasing the water flow velocity entering the impeller box water inlet, making the overall flow curve biased to the positive, and playing a role in regulating the flow error curve; in the case of reverse-rotating guide ribs, after the water flows into the meter case from the water inlet of the water meter, the water flows in a reverse-rotating direction under the guidance of the guide surface and the reverse-rotating guide ribs, thereby reducing the water flow velocity entering the impeller box water inlet, making the overall flow curve biased to the negative, and playing a role in regulating the flow error curve.

[0009] As an improvement, the connection structure between the flow regulating member and the impeller box is a quick-release positioning structure.

[0010] Preferably, the quick-release positioning structure includes a guide post extending downward from the middle of the bottom of the impeller box, a guide keyway provided in the middle of the flow regulating member, the guide keyway being sleeved on the outside of the guide post and fitting with the guide post; the upper portion of the guide post is a cylinder, and an annular rib is provided on the cylinder; the lower portion of the guide post is a cross-shaped post, and an annular groove is provided on the hole wall of the guide keyway, and the annular rib is embedded in the annular groove. The cross-shaped post is used to eliminate the rotation of the flow regulating member caused by the positive or negative rotation guide ribs under the force of the water flow; the annular rib is embedded in the annular groove, which can effectively prevent the flow regulating member from separating from the impeller box.

[0011] Preferably, the thickness of the forward-rotating guide rib or the reverse-rotating guide rib protruding from the guide surface is less than or equal to the thickness of the guide surface portion.

[0012] Preferably, the rotation angle of the forward-rotating guide ribs or the reverse-rotating guide ribs is 10 degrees to 90 degrees.

[0013] As the best, the rotation angle of the forward-rotating guide rib or the reverse-rotating guide rib is 30 degrees to 60 degrees.

[0014] As an improvement, a guide post 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 post and fits with the guide post, so as to facilitate the installation of the flow regulating member and the impeller box.

[0015] As an improvement, the guide column is a cylinder with an annular rib provided on it; an annular groove is provided on the hole wall of the guide keyway, and the annular rib is embedded in the annular groove, which can effectively prevent the flow regulating member from separating from the impeller box. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of Example 1.

[0017] Figure 2 It is a cross-sectional schematic diagram of Example 1.

[0018] Figure 3 This is an exploded view of Example 1.

[0019] Figure 4 It is a three-dimensional schematic diagram of Example 2.

[0020] Figure 5 It is a three-dimensional schematic diagram of Example 3. DETAILED DESCRIPTION

[0021] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Those skilled in the art may adjust them as needed to suit specific application scenarios.

[0022] Example 1

[0023] This embodiment Figures 1 to 3 The figure shows a flow control structure for a water meter, comprising an impeller box 1 and a flow control member 2. Flow control member 2 is connected to the bottom of the impeller box 1 and contains a cavity 2.1, which compresses inward when water freezes and expands to prevent the meter from cracking. Flow control member 2 is made of hard rubber or thermoplastic elastomer, with a hardness range of 70-95 Shore A, with an optimal hardness of 92 Shore A. Compressed air is enclosed in cavity 2.1, which supports the guide surface.

[0024] The flow regulating element 2's guide surface, supported by compressed air, is trumpet-shaped, larger at the top and narrower at the bottom. Under normal water pressure, the guide surface's cross-sectional arc forms a parabola. In the event of water pressure fluctuations, the compressed air within cavity 2.1 is automatically compressed or diffused, automatically adjusting the curvature of the guide surface and providing automatic flow control for the water entering the impeller box's water inlet.

[0025] Preferably, the connection structure between the flow regulating member 2 and the impeller box 1 is a quick-release positioning structure. The quick-release positioning structure includes a guide post 1.1 extending downward from the middle of the bottom of the impeller box 1 and a guide keyway 2.2 provided in the middle of the flow regulating member 2. The guide keyway 2.2 is sleeved outside the guide post 1.1 and fits with the guide post 1.1.

[0026] Here, the guide post 1.1 can be a solid cylinder, and the guide keyway 2.2 is a through groove. In this embodiment, the upper portion of the guide post 1.1 is a cylinder 1.2, and the lower portion of the guide post 1.1 is a cross-shaped post 1.3. The cylinder 1.2 is provided with an annular rib 1.4; the wall of the guide keyway 2.2 is provided with an annular groove (not shown in the figure), and the annular rib 1.4 is embedded in the annular groove.

[0027] Example 2

[0028] This embodiment Figure 4 The figure shows a flow regulating structure of a water meter, which is basically the same as 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 part. The positive rotation guide rib 2.3 can increase the structural strength of the guide surface and reduce the deformation of the guide surface, so it should not be too thick. The rotation angle of the positive rotation guide rib 2.3 is 10 degrees to 90 degrees, and the setting is adjusted as needed. The rotation angle of the positive rotation guide rib 2.3 is usually 30 degrees to 60 degrees.

[0029] Example 3

[0030] This embodiment Figure 5 The figure shows a flow regulating structure of a water meter, which is basically the same as Example 1, except that: a plurality of circumferentially distributed counter-rotating guide ribs 2.4 are provided outside the guide surface. The direction of rotation of the counter-rotating guide rib 2.4 is opposite to the direction of rotation of the water flow entering the impeller box 1. The thickness of the counter-rotating guide rib 2.4 protruding from the guide surface is less than or equal to the thickness of the guide surface portion. The counter-rotating guide rib 2.4 can also increase the structural strength of the guide surface and reduce the deformation of the guide surface, so it should not be too thick. The rotation angle of the counter-rotating guide rib 2.4 is 10 degrees to 90 degrees, and the setting is adjusted as needed. The rotation angle of the counter-rotating guide rib 2.4 is usually 30 degrees to 60 degrees.

[0031] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection 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, characterized in that: A cavity is provided in the flow regulating member, and compressed air is encapsulated in the cavity. The flow regulating member has a trumpet-shaped guide surface that is larger at the top and smaller at the bottom.

2. A flow regulating structure for a water meter according to claim 1, characterized in that: A plurality of circumferentially distributed forward-rotating guide ribs or reverse-rotating guide ribs are arranged outside the guide surface.

3. A flow regulating structure of a water meter according to claim 2, characterized in that: The connection structure between the flow regulating member and the impeller box is a quick-release positioning structure.

4. A flow regulating structure for a water meter according to claim 3, characterized in that: The quick-release positioning structure includes a guide column extending downward from the middle of the bottom of the impeller box, a guide keyway is provided in the middle of the flow regulating member, the guide keyway is sleeved on the outside of the guide column and fits with the guide column; the upper part of the guide column is a cylinder, and an annular rib is provided on the cylinder, the lower part of the guide column is a cross-shaped column, an annular groove is provided on the hole wall of the guide keyway, and the annular rib is embedded in the annular groove.

5. The flow regulating structure of a water meter according to claim 2, characterized in that: The thickness of the forward-rotating guide rib or the reverse-rotating guide rib protruding from the guide surface is less than or equal to the thickness of the guide surface portion.

6. The flow regulating structure of a water meter according to claim 2, characterized in that: The rotation angle of the forward-rotating guide rib or the reverse-rotating guide rib is 10 degrees to 90 degrees.

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

8. The flow regulating structure of a water meter according to claim 1, characterized in that: A guide column is provided in the middle of the bottom of the impeller box, and a guide key slot is provided in the middle of the flow regulating member. The guide key slot is sleeved outside the guide column and fits with the guide column.

9. The flow regulating structure of a water meter according to claim 8, characterized in that: The guide column is a cylinder, 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.

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