A double-plate structure flowmeter

Abstract

The utility model belongs to flowmeter technical field especially is a kind of double-plate structure flowmeter, including flowmeter body, first metering plate and second metering plate, the lower portion of flowmeter body is equipped with vertical communicating pipe, the lower portion of communicating pipe is fixedly connected with horizontal delivery pipe;The first metering plate is equipped with several small through holes for setting flow field, the inside of delivery pipe is fixedly installed with second metering plate on the side close to water outlet end, the second metering plate is equipped with multiple large through holes for generating differential pressure;By setting first metering plate and its small through hole, effectively play the role of rectification and uniformization flow field, provide ideal premise for the accurate differential pressure signal of second metering plate, make the length requirement of upstream straight pipe section greatly reduce, first metering plate is responsible for rectification, second metering plate is responsible for measurement, collaborative work, realize the dual function of flow field optimization and accurate measurement in limited space.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment technology, specifically relating to a double-plate flow meter. Background Technology

[0002] Differential pressure flow meters are among the most widely used flow measurement instruments in industry, with orifice plate flow meters being a typical example. Traditional orifice plate flow meters rely on a throttling element with a central opening installed in the pipe, causing the fluid to contract and creating a differential pressure before and after the throttling element for measurement.

[0003] However, traditional single-orifice plate flowmeters have extremely high requirements for the stability of the upstream flow field. After the fluid flows through valves, elbows and other pipe fittings, it will generate severe velocity distribution distortion and eddies. If they cannot be fully developed and stabilized, they will directly impact the orifice plate, causing the measured differential pressure value to be distorted and introducing huge errors.

[0004] Furthermore, the structure of traditional orifice plate flowmeters is prone to excessive permanent pressure loss and high energy consumption. Their measurement accuracy is significantly affected by changes in fluid density. When measuring steam, gas, etc., if temperature and pressure compensation is not performed, the measurement results will deviate significantly from the true value. Therefore, we propose a double-plate flowmeter. Utility Model Content

[0005] To address the issues raised in the background section regarding the extremely high stability requirements of traditional single-orifice plate flowmeters for the upstream flow field, where fluid undergoes severe velocity distribution distortion and eddies after passing through valves, elbows, and other pipe fittings, these eddies, if not fully stabilized, directly impact the orifice plate, leading to distorted differential pressure measurements and introducing significant errors; furthermore, the structure of traditional orifice plate flowmeters inherently results in excessive permanent pressure loss and high energy consumption, and their measurement accuracy is significantly affected by changes in fluid density. When measuring steam and gases, without temperature and pressure compensation, the measurement results will deviate severely from the true values. This invention provides a dual-plate flowmeter.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a double-plate flow meter, comprising a flow meter body, a first metering plate and a second metering plate, wherein a vertical connecting pipe is installed below the flow meter body, and a horizontal conveying pipe is fixedly connected below the connecting pipe, wherein one end of the conveying pipe is configured as an inlet end and the other end is configured as an outlet end;

[0007] A first metering plate is fixedly installed inside the conveying pipe on the side near the water inlet. The first metering plate has several small through holes for adjusting the flow field. A second metering plate is fixedly installed inside the conveying pipe on the side near the water outlet. The second metering plate has several large through holes for generating differential pressure.

[0008] As a preferred embodiment of the double-plate flow meter of this utility model, a filter is detachably installed on the outer side of the water inlet end by means of positioning bolts, and a filter screen is provided inside the filter.

[0009] As a preferred embodiment of the double-plate flow meter of this utility model, the first metering plate and the second metering plate are parallel to each other and are separated by a certain distance.

[0010] In a preferred embodiment of the dual-plate flow meter of this utility model, the diameter of the small through hole is smaller than that of the large through hole, and the small through holes are evenly and densely distributed on the first metering plate.

[0011] As a preferred embodiment of the double-plate flow meter of this utility model, a temperature sensor for detecting fluid temperature and a pressure sensor for detecting fluid pressure are also installed on the wall of the delivery pipe.

[0012] In a preferred embodiment of the double-plate flow meter of this utility model, the detection ends of both the temperature sensor and the pressure sensor extend into the internal cavity of the delivery pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a first metering plate and its small through hole, this application effectively plays the role of rectifying and homogenizing the flow field. No matter how turbulent the upstream flow is, it becomes stable after passing through the first metering plate, providing an ideal premise for the second metering plate to generate an accurate differential pressure signal. This significantly reduces the length requirement of the upstream straight pipe section and solves the problem of installing flow meters in narrow spaces. The first metering plate is responsible for rectifying the flow, and the second metering plate is responsible for measurement. The two have a clear division of labor and work together to form an organic whole. It realizes the dual functions of flow field optimization and accurate measurement in a limited space, preventing the problems of existing flow meters having extremely high requirements for the stability of the upstream flow field and easily leading to excessive permanent pressure loss and high energy consumption. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the external structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0018] Figure 4 This is a side view of the first measuring plate of this utility model.

[0019] Figure 5 This is a side view of the second measuring plate of this utility model.

[0020] In the diagram: 1. Flow meter body; 2. Connecting pipe; 3. Delivery pipe; 4. Inlet; 5. Outlet; 6. Filter; 7. Positioning bolt; 8. Filter screen; 9. Temperature sensor; 10. Pressure sensor; 11. First metering plate; 12. Second metering plate; 13. Small through hole; 14. Large through hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Embodiment 1

[0022] like Figures 1-5 As shown;

[0023] A double-plate flow meter includes a flow meter body 1, a first metering plate 11, and a second metering plate 12. A vertical connecting pipe 2 is installed below the flow meter body 1, and a horizontal conveying pipe 3 is fixedly connected below the connecting pipe 2. One end of the conveying pipe 3 is set as an inlet end 4, and the other end is set as an outlet end 5. The first metering plate 11 is fixedly installed inside the conveying pipe 3 near the inlet end 4. The first metering plate 11 has several small through holes 13 for adjusting the flow field. The second metering plate 12 is fixedly installed inside the conveying pipe 3 near the outlet end 5. The second metering plate 12 has several large through holes 14 for generating differential pressure.

[0024] In this implementation scheme, the first metering plate 11 and its small through-hole 13 are set up, which effectively plays the role of rectifying and homogenizing the flow field. No matter how turbulent the upstream flow is, it becomes stable after passing through the first metering plate 11, providing an ideal premise for the second metering plate 12 to generate an accurate differential pressure signal. This greatly reduces the length requirement of the upstream straight pipe section and solves the problem of installing flow meters in narrow spaces. The first metering plate 11 is responsible for rectifying the flow, and the second metering plate 12 is responsible for measurement. The two have a clear division of labor and work together to form an organic whole, realizing the dual functions of flow field optimization and accurate measurement in a limited space.

[0025] In an optional embodiment, a filter 6 is detachably mounted on the outside of the water inlet 4 via a positioning bolt 7, and a filter screen 8 is provided inside the filter 6.

[0026] In this implementation scheme: after the fluid flows through the first metering plate 11 for rectification, it can fully develop in the stable section between the two plates, forming a more stable and uniform flow field, and then act on the second metering plate 12, ensuring that the differential pressure signal generated by the second metering plate 12 is more stable and accurate, thereby significantly improving the measurement accuracy and reliability of the flow meter.

[0027] In an optional embodiment, the first measuring plate 11 and the second measuring plate 12 are parallel to each other and are separated by a certain distance.

[0028] In this implementation scheme: the smaller and denser distribution of the small through-holes 13 effectively disperses large-scale eddies in the fluid, providing excellent rectification and homogenization, creating ideal conditions for measurement. Meanwhile, the larger through-holes 14 on the second metering plate 12, while ensuring a sufficiently significant and stable differential pressure, help reduce the permanent pressure loss of the fluid and decrease energy consumption. This differentiated design of orifice size and distribution allows the two plates to perform their respective functions and work together, achieving a balance between high precision and low energy consumption.

[0029] In an optional embodiment, the diameter of the small through hole 13 is smaller than that of the large through hole 14, and the small through holes 13 are evenly and densely distributed on the first metering plate 11. A temperature sensor 9 for detecting fluid temperature and a pressure sensor 10 for detecting fluid pressure are also installed on the wall of the delivery pipe 3.

[0030] In this implementation scheme: by integrating temperature sensor 9 and pressure sensor 10, the operating parameters of the fluid can be acquired in real time. For fluids whose density and viscosity are greatly affected by temperature and pressure, the system can use these data for dynamic compensation and correction, thereby greatly expanding the applicable medium range of the flow meter and maintaining high measurement accuracy under various changing operating conditions.

[0031] In an optional embodiment, the probe ends of both the temperature sensor 9 and the pressure sensor 10 extend into the internal cavity of the delivery pipe 3.

[0032] In this implementation scheme, the sensor's probe end is directly inserted into the internal cavity of the delivery pipe 3, allowing direct contact with the measured medium, thereby enabling real-time and accurate measurement of the fluid's actual temperature and pressure values.

[0033] Working principle:

[0034] Preliminary filtration and fluid introduction: The fluid to be tested, such as water, steam or gas, enters from the inlet 4. The fluid first flows through the filter 6, and the filter screen 8 inside it intercepts larger particles, rust and other foreign objects that may be contained in the fluid, preventing them from entering the main measuring pipe and thus avoiding blockage or wear on subsequent precision measuring components.

[0035] Flow field tuning and homogenization: After preliminary filtration, the fluid enters the horizontal delivery pipe 3. The fluid first encounters the first metering plate 11 installed on the side near the water inlet 4. When the fluid passes through these densely distributed small through holes 13, the turbulence, eddies or uneven velocity distribution that may have been caused by upstream pipe fittings such as valves and elbows are effectively suppressed. The small through holes 13 disperse large-scale eddies, making the velocity and pressure of the fluid uniform and stable across the pipe cross-section, providing a stable and ideal flow condition for subsequent accurate measurement.

[0036] Differential pressure generation and signal acquisition: After the flow field is homogenized, the fluid continues to flow forward. After passing through the stable section between the first metering plate 11 and the second metering plate 12, it impacts the second metering plate 12. The large through-hole 14 on the second metering plate 12 causes the flow area to shrink to a certain extent. According to Bernoulli's principle, the fluid's kinetic energy increases and the static pressure decreases at this point, thus generating a stable pressure difference, namely differential pressure ΔP, on both sides of the second metering plate 12. This differential pressure value is detected through the pressure tapping channel inside the flow meter. According to the principles of fluid mechanics, the volumetric flow rate Q is proportional to the square root of this differential pressure, Q ∝ √ΔP. Therefore, the flow rate can be calculated by measuring the differential pressure.

[0037] Temperature and pressure compensation and accuracy improvement: The flow meter body 1 integrates a processing unit. The signal output terminals of the temperature sensor 9 and the pressure sensor 10 are electrically connected to the processing unit. The processing unit is used to receive differential pressure, temperature and pressure signals and calculate the compensated flow value. During the process of fluid flowing through the delivery pipe 3, the temperature sensor 9 and the pressure sensor 10 installed on the pipe wall monitor the temperature and pressure of the fluid in real time. Since the physical properties of the fluid, such as density and viscosity, will change with temperature and pressure, the introduction of this real-time data can dynamically compensate and correct the flow value calculated based on differential pressure, which greatly improves the measurement accuracy in situations with large changes in operating conditions such as steam and compressed gas. After the measurement is completed, the fluid is discharged from the outlet 5 and enters the downstream pipeline system.

[0038] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dual-plate flow meter, comprising a flow meter body (1), a first metering plate (11), and a second metering plate (12), characterized in that: A vertical connecting pipe (2) is installed below the flow meter body (1), and a horizontal conveying pipe (3) is fixedly connected below the connecting pipe (2). One end of the conveying pipe (3) is set as the water inlet (4), and the other end is set as the water outlet (5). A first metering plate (11) is fixedly installed inside the conveying pipe (3) on the side near the water inlet (4). The first metering plate (11) has several small through holes (13) for adjusting the flow field. A second metering plate (12) is fixedly installed inside the conveying pipe (3) on the side near the water outlet (5). The second metering plate (12) has several large through holes (14) for generating differential pressure.

2. The double-plate flow meter according to claim 1, characterized in that: A filter (6) is detachably installed on the outside of the water inlet (4) by a positioning bolt (7), and a filter screen (8) is provided inside the filter (6).

3. The double-plate flow meter according to claim 1, characterized in that: The first measuring plate (11) and the second measuring plate (12) are parallel to each other and are separated by a certain distance.

4. The double-plate flow meter according to claim 1, characterized in that: The diameter of the small through hole (13) is smaller than that of the large through hole (14), and the small through holes (13) are evenly and densely distributed on the first metering plate (11).

5. The double-plate flow meter according to claim 1, characterized in that: The delivery pipe (3) is also equipped with a temperature sensor (9) for detecting fluid temperature and a pressure sensor (10) for detecting fluid pressure.

6. The double-plate flow meter according to claim 5, characterized in that: The probe ends of both the temperature sensor (9) and the pressure sensor (10) extend into the internal cavity of the delivery pipe (3).

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