A special-shaped ball valve prepayment control device for ultrasonic flowmeter

Abstract

The utility model discloses a kind of special-shaped ball valve prepayment control devices for ultrasonic flowmeter, it is related to gas equipment technical field, including first shell and second shell, the one end of first shell is equipped with air inlet, first shell is fixedly connected with second shell, the other end of second shell is equipped with air outlet, sieve hole ball valve is equipped in first shell, rectifier is equipped in second shell;By integrating sieve hole ball valve and rectifier together, reduce installation space, reduce cost;Rectifier is through the synergic effect of multilayer rectifier tube and rectifier blade, utilize sharp wedge air inlet end to guide airflow acceleration, plane air outlet end stabilizes flow field, effectively reduce turbulence and noise, ensure ultrasonic flowmeter measurement accuracy, sieve hole ball valve and flowmeter do not need to keep distance;Limiting pin set on valve stem cooperates with semicircular limiting slot of first shell, accurately control valve body 180 ° rotation, guarantee that airflow passage is completely unobstructed when opening valve, sealing surface is leakproof when valve is closed.

Description

Technical Field

[0001] This utility model relates to the field of gas equipment technology, and in particular to a prepaid control device for a special-shaped ball valve used in ultrasonic flow meters. Background Technology

[0002] Currently, ultrasonic flow meters are widely used in gas volume measurement, calculating flow velocity and flow rate by detecting the time difference of ultrasonic wave propagation in the airflow. However, ultrasonic flow meters have extremely high requirements for the stability of gas flow and flow field distribution; any flow field disturbance or noise interference can lead to measurement errors. For example, components such as pressure regulators and valves in pipelines are prone to generating airflow pulsations, eddies, or mechanical noise during operation, directly affecting the transmission and reception accuracy of ultrasonic signals. Therefore, in practical applications, it is usually necessary to install a rectifier upstream of the flow meter to stabilize the flow field and employ noise reduction structures to reduce interference and ensure measurement accuracy.

[0003] Furthermore, ultrasonic flow meters are often used in conjunction with prepaid control valves to link gas metering with cost control. However, these prepaid control valves cause significant disturbances to the airflow when they open or close. If installed directly upstream of the flow meter, they will severely disrupt the flow field uniformity, leading to inaccurate metering. To address this issue, traditional installation methods require a distance of at least five times the pipe diameter between the valve and the flow meter, and the addition of a flow rectifier to restore the flow field. However, this approach increases the overall structural length and installation space, making it difficult to implement in space-constrained environments. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a prepaid control device for a special-shaped ball valve for ultrasonic flow meters, which overcomes the defect of increased installation space in existing devices and achieves the goal of reducing installation space.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: a prepaid control device for a special-shaped ball valve for an ultrasonic flow meter, comprising a first housing and a second housing, an air inlet at one end of the first housing, the first housing being fixedly connected to the second housing, an air outlet at the other end of the second housing, a sieve ball valve inside the first housing, and a rectifier inside the second housing.

[0006] Furthermore, the rectifier includes several coaxially mounted rectifier tubes, each rectifier tube having a radius that decreases sequentially from the outside to the inside. Several rectifier blades are evenly distributed circumferentially between adjacent rectifier tubes. The air inlet end of the rectifier blades is wedge-shaped, and the air outlet end is a planar structure.

[0007] Furthermore, the screen ball valve includes a third housing, one end of which is provided with a spherical end cap and the other end is an opening, and a number of strip-shaped holes are staggered on the third housing.

[0008] Furthermore, the third housing is symmetrically provided with two assembly slots along its central axis. One assembly slot is provided with a valve stem, and the other assembly slot is provided with a support rod. The other end of the support rod is rotatably mounted on the first housing.

[0009] Furthermore, the axis of the valve stem and the axis of the support rod are on the same straight line, and the valve stem and the support rod are arranged perpendicular to the axis of the third housing.

[0010] Furthermore, a speed reducer is provided at the other end of the valve stem, and a motor is connected to the speed reducer. A limit pin is vertically provided at the upper part of the valve stem, and a limit groove is provided on the first housing to cooperate with the limit pin. The limit groove is semi-circular, so that the limit pin can rotate 180° in the limit groove, and at the same time drive the screen ball valve to rotate 180°.

[0011] Furthermore, a PTFE gasket is provided at one end of the second housing near the screen ball valve, a first rubber sealing ring is provided between the PTFE gasket and the second housing, and a second rubber sealing ring is provided between the first housing and the second housing.

[0012] Furthermore, the inner diameters of the third housing, the air inlet, and the air outlet are equal; The central axis of the third housing is on the same straight line as the central axes of the air inlet and the air outlet. The central axis of the perforated ball valve is parallel to the airflow direction.

[0013] Furthermore, the total cross-sectional area of ​​the strip-shaped orifice is 85% of the inlet diameter area.

[0014] Furthermore, the third shell is cylindrical.

[0015] This utility model adopts the above technical solution and has the following advantages compared with the prior art: by integrating the sieve ball valve and the rectifier, the installation space is reduced and the cost is lowered; the rectifier, through the synergistic effect of multi-layer rectifier tubes and rectifier blades, uses the wedge-shaped air inlet end to guide the airflow to accelerate and the planar air outlet end to stabilize the flow field, effectively reducing turbulence and noise, ensuring the measurement accuracy of the ultrasonic flow meter, and there is no need to maintain a distance between the sieve ball valve and the flow meter; the limiting pin set on the valve stem cooperates with the semi-circular limiting groove of the first housing to precisely control the 180° rotation of the valve body, ensuring that the airflow channel is completely unobstructed when the valve is opened and that there is no leakage at the sealing surface when the valve is closed. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the prepaid control device for an ultrasonic flow meter using a non-circular ball valve in the closed state, as described in this utility model embodiment. Figure 2 This is a schematic diagram of the structure of the perforated ball valve in an embodiment of this utility model; Figure 3 This is a top view of the perforated ball valve in an embodiment of this utility model; Figure 4 This is a schematic diagram of the rectifier device in an embodiment of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the rectifier device in an embodiment of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the prepaid control device for an ultrasonic flow meter using a shaped ball valve in the open state, as described in this utility model embodiment. Figure 7 This is a comparison diagram of the flow velocity distribution curves in the simulation experiment of this utility model embodiment.

[0017] In the diagram: 1-First housing, 2-Second housing, 3-Reducer, 4-Valve stem, 5-Support rod, 6-Limit pin, 7-Screw ball valve, 8-Rectifier, 9-PTFE gasket, 10-First rubber seal, 11-Second rubber seal, 12-Third housing, 13-Assembly groove, 14-Spherical end cap, 15-Strip hole, 16-Limit groove, 17-Rectifier tube, 18-Rectifier blade, 19-Inlet, 20-Outlet. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0019] Examples, such as Figure 1-7 As shown, a prepaid control device for a special-shaped ball valve for an ultrasonic flow meter includes a first housing 1 and a second housing 2. One end of the first housing 1 is provided with an air inlet 19. The first housing 1 is fixedly connected to the second housing 2. The other end of the second housing 2 is provided with an air outlet 20. A screen ball valve 7 is provided inside the first housing 1, and a rectifier 8 is provided inside the second housing 2.

[0020] The sieve ball valve 7 includes a third housing 12, which is cylindrical. One end of the third housing 12 is provided with a spherical end cap 14, and the other end is open. Several strip holes 15 are staggered on the third housing 12. When the valve is open, the gas entering from the inlet 19 flows through the strip holes 15 and the rectifier 8 to the outlet 20. Two assembly slots 13 are symmetrically provided on the third housing 12 along its central axis. One assembly slot 13 is provided with a valve stem 4, and the other assembly slot 13 is provided with a support rod 5. The other end of the support rod 5 is rotatably mounted on the first housing 1. The axis of the valve stem 4 and the axis of the support rod 5 are on the same straight line. The valve stem 4 and the support rod 5 are perpendicular to the axis of the third housing 12.

[0021] The total cross-sectional area of ​​the strip-shaped orifice 15 is 85% of the diameter area of ​​the inlet 19.

[0022] The other end of the valve stem 4 is equipped with a reducer 3, and a motor (not shown in the figure) is connected to the reducer 3. A limit pin 6 is vertically provided on the upper part of the valve stem 4. A limit groove 16 that cooperates with the limit pin 6 is provided on the first housing 1. The limit groove 16 is semi-circular, so that the limit pin 6 can rotate 180° in the limit groove 16, and at the same time drive the screen ball valve 7 to rotate 180°.

[0023] The rectifier 8 includes several coaxially mounted rectifier tubes 17, which are four in this example. The radius of each rectifier tube 17 decreases from the outside to the inside. Several rectifier blades 18 are evenly distributed circumferentially between adjacent rectifier tubes 17. The air inlet end of the rectifier blade 18 is wedge-shaped to guide the airflow and reduce flow resistance, while the air outlet end is a planar structure to stabilize the flow field and reduce turbulence.

[0024] The central axis of the third housing 12 is on the same straight line as the central axes of the air inlet 19 and the air outlet 20.

[0025] The second housing 2 is provided with a PTFE gasket 9 at one end near the sieve ball valve 7. A first rubber sealing ring 10 is provided between the PTFE gasket 9 and the second housing 2. When the valve is closed, the spherical end cap 14 of the sieve ball valve 7 is tightly fitted with the PTFE gasket 9, preventing gas from passing through. A second rubber sealing ring 11 is provided between the first housing 1 and the second housing 2.

[0026] The inner diameters of the third housing 12, air inlet 19, and air outlet 20 are equal.

[0027] The central axis of the perforated ball valve 7 is parallel to the airflow direction.

[0028] Working principle: During use, gas enters the first housing 1 through the inlet 19, flows through the perforated ball valve 7, and after the flow rate is adjusted by the rectifier 8, it finally flows out from the outlet 20. The pre-load control structure of this irregular ball valve drives the valve stem 4 to rotate through the motor-driven reducer 3, controlling the perforated ball valve 7 to switch between open and closed states.

[0029] When the valve is closed, the spherical end cap 14 of the sieve ball valve 7 faces the outlet 20 and is tightly fitted with the PTFE gasket 9 to form a complete seal. When the valve is open, the motor drives the valve stem 4 to rotate 180°, so that the open end of the sieve ball valve 7 is aligned with the outlet 20. The gas passes through the strip hole 15, the internal cavity of the sieve ball valve 7 and the rectifier 8 in sequence, and is discharged from the outlet 20.

[0030] By integrating the sieve ball valve 7 and the rectifier 8, the installation space is reduced and the cost is lowered. The rectifier 8, through the synergistic effect of the multi-layer rectifier tube 17 and the rectifier blade 18, uses the wedge-shaped air inlet end to guide the airflow to accelerate and the planar air outlet end to stabilize the flow field, effectively reducing turbulence and noise, ensuring the measurement accuracy of the ultrasonic flow meter, and eliminating the need to maintain a distance between the sieve ball valve and the flow meter. The limiting pin 6 set on the valve stem 4 cooperates with the semi-circular limiting groove 16 of the first housing 1 to precisely control the 180° rotation of the valve body, ensuring that the airflow channel is completely unobstructed when the valve is opened and that there is no leakage at the sealing surface when the valve is closed.

[0031] Comparative experiment on the impact of prepaid control devices for irregularly shaped ball valves on the performance of ultrasonic flow meters: Experimental Objective: This experiment aims to verify the rectification and noise reduction effect and the guarantee effect on flow measurement accuracy after directly connecting the "irregular ball valve prepaid control device" to the front end of the ultrasonic flow meter, and to compare it with the traditional installation method of adding a rectification device.

[0032] Experimental Design: This experiment compares and contrasts two methods: simulation analysis and physical verification testing. The specific settings are as follows: Experimental Group 1: The front end of the prepaid control device for the irregular ball valve is connected to a straight pipe section, and the rear end is connected to an ultrasonic flow meter; Experimental Group 2: The front end of the prepaid control device for the irregular ball valve is connected to an elbow, and the rear end is connected to an ultrasonic flow meter; Control group 1: The traditional installation method was adopted, with a distance of 5 times the pipe diameter between the valve and the ultrasonic flow meter, and a rectifier was added before the ultrasonic flow meter, with a straight pipe section connected to the front end of the valve; Control group 2: The traditional installation method was adopted, with a distance of 5 times the pipe diameter between the valve and the ultrasonic flow meter, and a rectifier device was added before the ultrasonic flow meter, with an elbow connected to the front end of the valve.

[0033] In all groups, the pipe diameter of the straight sections and elbows is the same, and the input flow velocity is the same. Flow velocity measurement is existing technology and will not be described in detail here.

[0034] Simulation analysis results: The velocity distribution curves at the inlet section of the ultrasonic measurement area were extracted through simulation experiments and compared and analyzed (see appendix). Figure 7 The results show that, under the same front-end conditions, the velocity distribution pattern of the experimental group and the control group at this cross section is basically the same, proving from the perspective of flow field science that the pre-paid control device of the irregular ball valve is comparable to the traditional rectification scheme in ensuring measurement accuracy.

[0035] Physical verification test results: Multiple measurements were performed under the same working conditions, and the results of the four groups of physical verification experiments were analyzed. The repeatability of the verification was less than 0.2%, and the measurement difference between experimental group 1 and control group 1 was less than 0.5%. The measurement difference between experimental group 2 and control group 2 was also basically the same, indicating that the prepaid control device for the irregular ball valve is comparable to the traditional rectification scheme in terms of ensuring measurement accuracy.

[0036] Conclusion: Simulation analysis reveals from the flow field mechanism that the pre-paid control device for the irregular ball valve possesses rectification capabilities, producing a measurement cross-section with a flow pattern similar to that of traditional rectification schemes. Physical verification confirms from a metrological performance perspective that the device can ensure the measurement accuracy and repeatability of the ultrasonic flowmeter meet the verification requirements under different installation conditions, and its performance is equivalent to that of traditional schemes.

[0037] In summary, the rectification and noise reduction effect of this device is comparable to the traditional solution of "5 times the pipe diameter distance plus a traditional rectifier", but it does not require additional installation space, significantly improving space utilization efficiency, while reliably ensuring the measurement accuracy of the ultrasonic flow meter.

[0038] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A prepaid control device for a non-standard ball valve used in ultrasonic flow meters, characterized in that: It includes a first housing (1) and a second housing (2). One end of the first housing (1) is provided with an air inlet (19). The first housing (1) is fixedly connected to the second housing (2). The other end of the second housing (2) is provided with an air outlet (20). The first housing (1) is provided with a sieve ball valve (7). The second housing (2) is provided with a rectifier (8).

2. The prepaid control device for a non-circular ball valve used in an ultrasonic flow meter as described in claim 1, characterized in that: The rectifier (8) includes several rectifier tubes (17) coaxially mounted. The radius of each rectifier tube (17) decreases from the outside to the inside. Several rectifier blades (18) are evenly distributed circumferentially between adjacent rectifier tubes (17). The air inlet end of the rectifier blade (18) is wedge-shaped, and the air outlet end is a planar structure.

3. The prepaid control device for a non-circular ball valve used in an ultrasonic flow meter as described in claim 1, characterized in that: The screen ball valve (7) includes a third housing (12), one end of which is provided with a spherical end cap (14) and the other end is an opening. Several strip holes (15) are arranged alternately on the third housing (12).

4. The prepaid control device for a non-circular ball valve used in an ultrasonic flow meter as described in claim 3, characterized in that: The third housing (12) is provided with two symmetrical mounting slots (13) along its central axis. One mounting slot (13) is provided with a valve stem (4), and the other mounting slot (13) is provided with a support rod (5). The other end of the support rod (5) is rotatably mounted on the first housing (1).

5. The prepaid control device for a non-circular ball valve used in an ultrasonic flow meter as described in claim 4, characterized in that: The axis of the valve stem (4) and the axis of the support rod (5) are on the same straight line, and the valve stem (4) and the support rod (5) are perpendicular to the axis of the third housing (12).

6. The prepaid control device for a non-circular ball valve used in an ultrasonic flow meter as described in claim 4, characterized in that: The valve stem (4) is equipped with a speed reducer (3) at the other end. A motor is connected to the speed reducer (3). A limit pin (6) is vertically provided on the upper part of the valve stem (4). A limit groove (16) is provided on the first housing (1) to cooperate with the limit pin (6). The limit groove (16) is semi-circular, so that the limit pin (6) can rotate 180° in the limit groove (16) and drive the sieve ball valve (7) to rotate 180° at the same time.

7. The prepaid control device for a non-circular ball valve used in an ultrasonic flow meter as described in claim 1, characterized in that: The second housing (2) is provided with a PTFE gasket (9) at one end near the sieve ball valve (7), and a first rubber sealing ring (10) is provided between the PTFE gasket (9) and the second housing (2), and a second rubber sealing ring (11) is provided between the first housing (1) and the second housing (2).

8. The prepaid control device for a non-circular ball valve used in an ultrasonic flow meter as described in claim 3, characterized in that: The inner diameters of the third housing (12), the air inlet (19), and the air outlet (20) are equal; The central axis of the third housing (12) is on the same straight line as the central axis of the air inlet (19) and the air outlet (20); The central axis of the sieve ball valve (7) is parallel to the airflow direction.

9. The prepaid control device for a non-circular ball valve used in an ultrasonic flow meter as described in claim 3, characterized in that: The total cross-sectional area of ​​the strip-shaped hole (15) is 85% of the diameter area of ​​the air inlet (19).

10. The prepaid control device for a non-circular ball valve used in an ultrasonic flow meter as described in claim 3, characterized in that: The third shell (12) is cylindrical.

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