Eccentric orifice plate flowmeter

Abstract

The utility model discloses an eccentric orifice plate flowmeter which comprises a measuring mechanism and a pipeline mechanism. The measuring mechanism comprises a measuring cylinder, a connecting bolt and a connecting nut which are used for fixing the measuring cylinder, pore plate flanges which are connected to two ends of the measuring cylinder, a straight pressure tapping pipe which is in through connection with the measuring cylinder, a pressure tapping valve which is arranged at the middle section of the straight pressure tapping pipe, a three-valve group which is connected to the top end of the straight pressure tapping pipe, and a differential pressure transmitter which is assembled at the top of the three-valve group. According to the utility model, the pore plate sheet is arranged in the middle of the measuring cylinder, so that when a medium is liquid, the pore plate sheet deviates downwards, and when the medium is gas, the pore plate sheet deviates upwards, the detection stability can be ensured by changing the flowing position, and when liquid and gas exist in the medium at the same time, the flowing stability can be improved, and the detection accuracy can be ensured; therefore, the screening plates are arranged at the two ends of the measuring cylinder to filter the medium and slow the flow at the same time, the flow velocity difference can be reduced, high-speed fluid can be measured, and the application range of the device is widened.

Description

Technical Field

[0001] The utility model relates to the technical field of orifice plate flowmeters, in particular to an eccentric orifice plate flowmeter. Background Art

[0002] Simply put, a flow meter is an instrument used to measure the flow of fluids in a pipeline or open channel. An orifice flow meter is a high-range differential pressure flow device consisting of a standard orifice plate and a multi-parameter differential pressure transmitter or temperature transmitter and a pressure transmitter. It can measure the flow of gas, steam, liquid, and natural gas, and is widely used in process control and measurement in the fields of petroleum, chemical industry, metallurgy, electric power, heating, and water supply.

[0003] However, the orifice plate inside the existing orifice flowmeter is fixed, so the measurement method for gas and liquid is the same, so the detection result is not accurate enough, and once the flow rate is too high, it is difficult to detect accurately. For this reason, an eccentric orifice flowmeter is proposed. Utility Model Content

[0004] The utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0005] To this end, the technical solution adopted in this utility model is:

[0006] An eccentric orifice flowmeter includes a measuring mechanism and a pipeline mechanism. The measuring mechanism includes a measuring cylinder, connecting bolts and connecting nuts for fixing the measuring cylinder, an orifice flange connected to both ends of the measuring cylinder, a straight pressure pipe connected to the measuring cylinder, a pressure taking valve arranged in the middle section of the straight pressure pipe, a three-valve group connected to the top of the straight pressure pipe, and a differential pressure transmitter assembled on the top of the three-valve group. An orifice plate is installed in the middle of the measuring cylinder, and a gasket is assembled on the orifice plate. The pipeline mechanism includes connecting pipes inserted into both ends of the measuring cylinder, a fixing flange for fixing the position of the connecting pipe, a connecting buckle fixedly connected to the inner end of the connecting pipe, a screening ring installed at the end of the connecting buckle, and a screening plate arranged on the inner ring of the screening ring.

[0007] Preferably, the orifice plate flange is threadedly connected to the fixed flange, and a sealing gasket is provided on the inner side of the fixed flange.

[0008] Preferably, a curved pressure-taking tube is installed at a position on the top of the measuring cylinder opposite to the straight pressure-taking tube, a pressure-taking valve is also provided on the curved pressure-taking tube, and the curved pressure-taking tube is bent in shape.

[0009] Preferably, the outer ring of the screening ring is provided with a rubber ring, and the rubber ring is in contact with the inner wall of the measuring cylinder.

[0010] Preferably, the sieve plate is a double-layer arrangement, and the sieve holes of the sieve plate are large in diameter.

[0011] By adopting the above technical solution, the beneficial effects achieved by the utility model are as follows:

[0012] In the present invention, an orifice plate is provided in the middle of the measuring tube, so that when the medium is liquid, the orifice plate is deflected downward, and when the medium is gas, the orifice plate is deflected upward, thereby ensuring the stability of the detection by changing the flow position, and when the medium contains both liquid and gas, the flow stability can also be improved to ensure the accuracy of the detection. Therefore, sieve plates are provided at both ends of the measuring tube to filter the medium and slow the flow at the same time, which can reduce the flow rate difference. Therefore, high-speed fluids can also be measured, thereby improving the scope of use of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view schematic diagram of an embodiment of the utility model;

[0014] Figure 2 A schematic cross-sectional view of an embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of a screening plate according to an embodiment of the present invention.

[0016] Reference numerals:

[0017] 110, measuring tube; 111, orifice plate; 112, gasket; 120, connecting bolt; 130, connecting nut; 140, orifice plate flange; 150, straight pressure pipe; 151, curved pressure pipe; 160, pressure valve; 170, three-valve group; 180, differential pressure transmitter;

[0018] 210. Connecting pipe; 220. Fixing flange; 230. Connecting buckle; 240. Screening ring; 250. Screening plate. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features therein can be combined with each other unless there is any conflict.

[0020] The following describes the eccentric orifice flowmeter provided by some embodiments of the present invention in conjunction with the accompanying drawings.

[0021] Example:

[0022] Combine Figure 1-3As shown, the eccentric orifice flowmeter provided by the present invention includes a measuring mechanism and a pipeline mechanism, the measuring mechanism includes a measuring cylinder 110, a connecting bolt 120 and a connecting nut 130 for fixing the measuring cylinder 110, an orifice flange 140 connected to both ends of the measuring cylinder 110, a straight pressure pipe 150 connected to the measuring cylinder 110, a pressure-taking valve 160 arranged in the middle section of the straight pressure pipe 150, a three-valve group 170 connected to the top of the straight pressure pipe 150, and a differential pressure transmitter 180 assembled on the top of the three-valve group 170. An orifice plate 111 is installed in the middle of the measuring cylinder 110, a gasket 112 is assembled on the orifice plate 111, and a curved pressure pipe 150 is installed at the top of the measuring cylinder 110 at a position opposite to the straight pressure pipe 150. 1. A pressure-taking valve 160 is also provided on the curved pressure-taking tube 151, and the curved pressure-taking tube 151 is bent. The pipeline mechanism includes connecting tubes 210 inserted at both ends of the measuring cylinder 110, a fixing flange 220 for fixing the position of the connecting tube 210, a connecting buckle 230 fixedly connected to the inner end of the connecting tube 210, a screening ring 240 installed at the end of the connecting buckle 230, and a screening plate 250 arranged on the inner ring of the screening ring 240. The orifice plate flange 140 is threadedly connected to the fixing flange 220, and a sealing gasket is provided on the inner side of the fixing flange 220. A rubber ring is provided on the outer ring of the screening ring 240, and the rubber ring is in contact with the inner wall of the measuring cylinder 110. The screening plate 250 is a double-layer arrangement, and the sieve holes of the screening plate 250 are large-aperture.

[0023] Specifically, the screening effect of the screening plate 250 is utilized to intercept larger impurities in the medium, playing a simple filtering role. At the same time, the medium can be slowed down during use. At the same time, the screening plate 250 on the other side can also slow down the flow, so that the front and rear speeds of the medium are slowed down, thereby reducing the difference. Therefore, a higher-precision differential pressure transmitter 180 can be used to detect media with higher flow rates, thereby increasing the detection range of the device and improving the practicality of the device.

[0024] The working principle and usage process of the present invention are as follows: First, the fixed flange 220 is connected to the orifice flange 140 to realize the connection between the connecting pipe 210 and the measuring cylinder 110. Then, the switch is turned on to pass through the interior of the connecting pipe 210 and the measuring cylinder 110, and the medium is introduced to start measuring the flow. The flow is calculated using the pressure difference between the front and rear ends of the middle part of the measuring cylinder 110, and finally the flow can be recorded.

[0025] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. Eccentric orifice flowmeter, characterized in that, include: Measuring and piping mechanisms; The measuring mechanism comprises a measuring tube (110), a connecting bolt (120) and a connecting nut (130) for fixing the measuring tube (110), an orifice flange (140) connected to both ends of the measuring tube (110), a direct pressure pipe (150) connected to the measuring tube (110), a pressure valve (160) arranged in the middle section of the direct pressure pipe (150), a three-valve group (170) connected to the top of the direct pressure pipe (150), and a differential pressure transmitter (180) assembled on the top of the three-valve group (170); A hole plate (111) is installed in the middle of the measuring cylinder (110), and a gasket (112) is mounted on the hole plate (111); The pipeline mechanism comprises a connecting pipe (210) plugged into both ends of the measuring cylinder (110), a fixing flange (220) for fixing the position of the connecting pipe (210), a connecting buckle (230) fixedly connected to the inner end of the connecting pipe (210), a screening ring (240) mounted on the end of the connecting buckle (230), and a screening plate (250) arranged on the inner ring of the screening ring (240).

2. The eccentric orifice flowmeter according to claim 1, characterized in that: The orifice plate flange (140) is threadedly connected to the fixed flange (220), and a sealing gasket is provided on the inner side of the fixed flange (220).

3. The eccentric orifice flowmeter according to claim 1, characterized in that: A curved pressure-taking tube (151) is installed at a position on the top of the measuring cylinder (110) opposite to the straight pressure-taking tube (150). A pressure-taking valve (160) is also provided on the curved pressure-taking tube (151), and the curved pressure-taking tube (151) is bent in shape.

4. The eccentric orifice flowmeter according to claim 1, characterized in that: The outer ring of the screening ring (240) is provided with a rubber ring, and the rubber ring is fitted with the inner wall of the measuring cylinder (110).

5. The eccentric orifice flowmeter according to claim 1, characterized in that: The sieve plate (250) is double-layered, and the sieve holes of the sieve plate (250) are large in diameter.

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