A flange pressure regulating orifice plate

Abstract

The utility model discloses a flange pressure-taking and regulating orifice plate, comprising a pressure-taking flange and a multi-hole orifice plate with a handle, wherein the multi-hole orifice plate with a handle comprises a handle and the orifice plate, the orifice plate is located on the handle, the orifice plate is located in the pressure-taking flange, a central hole is arranged at the center of the orifice plate, four flow holes are evenly arranged in the circumferential direction of the outer periphery of the central hole, the aperture of the flow hole is 4-6.5mm, and the aperture of the central hole is 7-15mm. In the flange pressure-taking and regulating orifice plate, a central hole is arranged at the center of the orifice plate, four flow holes are evenly arranged in the circumferential direction of the outer periphery of the central hole The flange pressure-taking and regulating orifice plate has a center hole at the center of the orifice plate, and four flow holes are evenly arranged around the circumference of the center hole. The diameter of the flow holes is 4-6.5mm, and the diameter of the center hole is 7-15mm. It can not only meet the measurement limitations of engineering sites with short front and rear straight pipe sections, but also meet the high requirement of the traditional standard orifice plate measurement accuracy error value below ±1%.

Description

Technical Field

[0001] The utility model relates to the field of orifice flowmeters, in particular to a flange pressure-taking and regulating orifice plate. Background Art

[0002] The orifice flowmeter includes an orifice plate and a pressure transmitter. The orifice plate is set in the pipeline. When the fluid filling the pipeline flows through the orifice plate, it will produce local contraction, the flow beam will be concentrated, the flow velocity will increase, the static pressure will decrease, and a static pressure difference will be generated before and after the orifice plate. The pressure lead pipe of the pressure transmitter is connected to both sides of the orifice plate. Therefore, the pressure transmitter can deduce the relationship between the pressure difference and the flow rate according to the flow continuity principle and the Bernoulli equation to obtain the flow rate.

[0003] The orifice plate in the traditional orifice flowmeter is a standard orifice plate with a single center hole. It is characterized by stable measurement and high accuracy. However, it has high requirements for the measurement environment, that is, the length of the straight pipe section before and after the orifice plate is at least 22 times the pipe diameter.

[0004] Due to the requirement for straight pipe sections, the use of traditional orifice plates is limited, so a multi-hole orifice plate with four holes is designed, according to the patent number: CN207923206U, patent name: a diameter-spacing pressure nuclear grade multi-hole orifice plate device. The following are collectively referred to as reference patents, which record the characteristics of the multi-hole orifice plate. The requirements for the front and rear straight pipe sections are that the length of the front straight pipe section is 4 times the pipe diameter, and the length of the rear straight pipe section is 2 times the pipe diameter. The requirements are reduced, but the measurement accuracy is lower than that of the single-hole orifice plate.

[0005] Therefore, based on the above situation, it is necessary to design a flange pressure regulating orifice plate that is suitable for small flow, small pipe diameter, high pressure drop at a specific flow point, and high measurement accuracy requirements. Utility Model Content

[0006] In order to overcome the deficiencies of the above-mentioned background technology, the utility model provides a flange pressure-taking and regulating orifice plate.

[0007] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0008] A flange pressure-taking and regulating orifice plate comprises a pressure-taking flange and a porous orifice plate with a handle. The porous orifice plate with a handle comprises a handle and the orifice plate. The orifice plate is located on the handle, and the orifice plate is located in the pressure-taking flange. A center hole is provided at the center of the orifice plate, and four flow holes are evenly provided on the outer circumference of the center hole. The aperture of the flow holes is 4-6.5 mm, and the aperture of the center hole is 7-15 mm.

[0009] Preferably, the center-to-center spacing between the central hole and the through-hole is between 0.5 and 0.7 times the diameter of the pipeline.

[0010] Preferably, the orifice plate and the pressure flange are sealed and connected via a sealing gasket, which is a metal-wound graphite gasket.

[0011] Preferably, two pressure pipes are provided on the pressure-taking flange, which are respectively located on the front and rear sides of the orifice plate. The two pressure pipes are a positive pressure pipe and a negative pressure pipe, respectively. The two pressure pipes output positive pressure signals and negative pressure signals, and the two signals can be collected by sensors.

[0012] Preferably, the pressure taking flange and the orifice plate are fixedly connected via a mounting assembly.

[0013] Preferably, the mounting assembly includes a stud, a first hexagonal nut, a double-ear stop washer, a jacking screw and a second hexagonal nut, the stud, the first hexagonal nut and the double-ear stop washer are a first mounting unit, the pressure flange is fixedly connected to the orifice plate through the first mounting unit, the jacking screw and the second hexagonal nut are a second mounting unit, the pressure flange is connected to the orifice plate through the second mounting unit, the pressure flange 1 is connected and disassembled to the orifice plate 32 through the second mounting unit, and the pressure flange 1 is fixedly connected to the process pipeline by on-site butt welding.

[0014] The beneficial effects of the utility model are as follows: in the flange pressure-taking and regulating orifice plate, a center hole is provided at the center of the orifice plate, and four flow holes are evenly provided in the circumferential direction of the outer periphery of the center hole. At the same time, the aperture of the flow holes is 4-6.5mm, and the aperture of the center hole is 7-15mm. This not only meets the measurement limitation requirements of engineering sites with short front and rear straight pipe sections, but also achieves the high requirement of the traditional standard orifice plate measurement accuracy error value being less than ±1%. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a side view of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the sealing gasket of the utility model;

[0019] Figure 4 It is a side view of the sealing gasket of the utility model.

[0020] In the figure: 1. pressure flange, 2. pressure pipe, 3. multi-hole plate with handle, 4. sealing gasket, 5. stud, 6. first hexagonal nut, 7. double-ear stop washer, 8. jacking screw, 9. second hexagonal nut, 31. handle, 32. orifice plate, 33. center hole, 34. flow hole. DETAILED DESCRIPTION

[0021] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0022] like Figure 1-Figure 4 As shown, a flange pressure-taking orifice plate comprises a pressure-taking flange 1 and a multi-hole orifice plate 3 with a handle. The multi-hole orifice plate 3 with a handle comprises a handle 31 and an orifice plate 32. The orifice plate 32 is located on the handle 31, and the orifice plate 32 is located in the pressure-taking flange 1. The orifice plate 32 and the handle 31 are integrated without welding, and are a paddle-type structure. The orifice plate 32 is clamped in the pressure-taking flange 1. A center hole 33 is provided at the center of the orifice plate 32. Four flow holes 34 are evenly provided around the periphery of the center hole 33. The aperture of the flow holes 34 is 4-6.5 mm, and the aperture of the center hole 33 is 7-15 mm. The flange pressure-taking orifice plate can be used for measurement when the front and rear straight pipe sections are short, and the measurement accuracy can be seen from the following table:

[0023] Flange pressure regulating orifice plate test table

[0024]

[0025] As can be seen from the table above, under different flow values, the value measured at the pressure pipe 2 is analyzed and judged to compare the standard flow value, and the indication error is less than ±1%, which can achieve the measurement accuracy of the traditional standard orifice plate. As a result, the flange pressure adjustment orifice plate can not only meet the measurement requirements of engineering sites with short front and rear straight pipe sections, but also meet the high requirements of the traditional orifice plate measurement accuracy error value less than ±1%.

[0026] Specifically, the distance between the center holes 33 and the through holes 34 is between 0.5 and 0.7 times the diameter of the pipeline.

[0027] Specifically, the orifice plate 32 and the pressure flange 1 are sealed and connected via a sealing gasket 4 , and the sealing gasket 4 is a metal-wound graphite gasket.

[0028] Specifically, two pressure pipes 2 are provided on the pressure-taking flange 1, and the pressure pipes 2 are respectively located on the front and rear sides of the orifice plate 32. The two pressure pipes 2 are respectively a positive pressure pipe 2 and a negative pressure pipe 2. The two pressure pipes 2 output positive pressure signals and negative pressure signals, and the two signals can be collected by sensors.

[0029] Specifically, the pressure flange 1 and the orifice plate 32 are fixedly connected via a mounting assembly.

[0030] Specifically, the installation assembly includes a stud 5, a first hexagonal nut 6, a double-ear stop washer 7, a lifting screw 8 and a second hexagonal nut 9. The stud 5, the first hexagonal nut 6 and the double-ear stop washer 7 are a first installation unit. The pressure taking flange 1 is fixedly connected to the pipeline through the first installation unit, and the left side of the pressure taking flange 1 is connected to the pipeline. The lifting screw 8 and the second hexagonal nut 9 are a second installation unit. The pressure taking flange 1 is connected and disassembled with the orifice plate 32 through the second installation unit, and the pressure taking flange 1 is fixedly connected to the process pipeline by on-site butt welding.

[0031] The above is based on the enlightenment of this utility model. Through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of ​​this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A flange pressure regulating orifice plate, characterized in that: It includes a pressure-taking flange and a porous orifice plate with a handle. The porous orifice plate with a handle includes a handle and a orifice plate. The orifice plate is located on the handle, and the orifice plate is located in the pressure-taking flange. A center hole is provided at the center of the orifice plate, and four flow holes are evenly arranged on the outer circumference of the center hole. The aperture of the flow hole is 4-6.5mm, and the aperture of the center hole is 7-15mm.

2. The flange pressure regulating orifice plate according to claim 1, characterized in that: The hole center spacing between the central hole and the through-flow hole is between 0.5 and 0.7 times the diameter of the pipeline.

3. The flange pressure regulating orifice plate according to claim 1, characterized in that: The orifice plate and the pressure-taking flange are sealed and connected via a sealing gasket, which is a metal-wound graphite gasket.

4. The flange pressure regulating orifice plate according to claim 1, characterized in that: The pressure-taking flange is provided with two pressure-conducting pipes, which are respectively located at the front and rear sides of the orifice plate, and the two pressure-conducting pipes are respectively a positive pressure pressure-conducting pipe and a negative pressure pressure-conducting pipe.

5. The flange pressure regulating orifice plate according to claim 1, characterized in that: The pressure taking flange and the orifice plate are fixedly connected via a mounting assembly.

6. The flange pressure regulating orifice plate according to claim 5, characterized in that: The mounting assembly includes a stud, a first hexagonal nut, a double-ear stop washer, a jacking screw and a second hexagonal nut. The stud, the first hexagonal nut and the double-ear stop washer are a first mounting unit, and the pressure flange is fixedly connected to the orifice plate through the first mounting unit. The jacking screw and the second hexagonal nut are a second mounting unit, and the pressure flange is connected to the orifice plate through the second mounting unit.

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