Balanced flow meter of porous orifice plate

Abstract

The utility model discloses a porous orifice plate balance flow meter, which relates to the field of flow meter structures and comprises a flow meter body, the flow meter body is provided with a measuring tube, and at least one end of the measuring tube is hermetically connected with a corrugated tube. According to the utility model, the axial size of the flowmeter can be adjusted according to the requirement of the distance between on-site pipelines for installing the flowmeter, so that the axial size of the flowmeter can adapt to the distance for installing the flowmeter, and the adaptive scene of the flowmeter is increased.

Description

Technical Field

[0001] The utility model relates to the field of flowmeter structures, in particular to a porous orifice plate balanced flowmeter. Background Technique

[0002] The measurement principle of the porous orifice plate balanced flowmeter is established based on the installation of the porous orifice plate in a pipeline filled with fluid. After the porous orifice plate is installed, a static pressure difference is generated between the upstream and downstream sides of the porous orifice plate. A pressure-taking device is used to obtain a stable differential pressure signal. According to the measured value of this pressure difference, the characteristics of the flowing fluid, and the usage environment of the device, and at the same time, based on the continuity equation and Bernoulli equation, the numerical relationship between the static pressure difference and the fluid flow rate can be deduced. Therefore, in the field of flow measurement, in certain specific environments, the porous orifice plate balanced flowmeter has unique advantages. For example, the Chinese patent with the publication number CN102435236A discloses a porous plate flowmeter.

[0003] The current porous plate flowmeters have various specifications. According to the on-site installation requirements, different specifications need to be selected during installation. For example, whether the axial dimension of the flowmeter meets the spacing between the pipelines for installing the flowmeter is also a factor that needs to be considered. However, in the field, the problem often occurs that the spacing for installing the flowmeter does not match the axial length of all specifications of the porous plate flowmeters. Therefore, to solve this problem, it is necessary to improve the current porous orifice plate balanced flowmeter. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a porous orifice plate balanced flowmeter that can adjust the axial dimension of the flowmeter according to the spacing requirements between the on-site pipelines for installing the flowmeter, so that the axial dimension of the flowmeter can adapt to the installation spacing of the flowmeter, and increase the applicable scenarios of the flowmeter.

[0005] The technical solution adopted by the utility model is as follows: A porous orifice plate balanced flowmeter includes a flowmeter body, and the flowmeter body has a measuring pipe, and at least one end of the measuring pipe is hermetically connected with a corrugated pipe.

[0006] Further, both ends of the corrugated pipe have first flanges, and both ends of the measuring pipe have second flanges. The first flange is connected to the second flange to realize the connection between the measuring pipe and the corrugated pipe.

[0007] Further, both the first flange and the second flange have sealing grooves for installing sealing rings, and the sealing grooves are annular.

[0008] Further, the sealing grooves on the first flange and the sealing grooves on the second flange have no overlapping parts in the projection on the same flange surface.

[0009] Further, both the first flange and the second flange are provided with flange connection holes for bolting, and the positions of the flange connection holes on the first flange and the second flange are matched.

[0010] Further, through holes are also provided on the first flange, and there are screws passing through the through holes on the same axis and different first flanges along the axial direction of the bellows, and nuts are connected to both ends of the screws to lock the length of the bellows.

[0011] Further, through holes are also provided on the second flange, and the positions of the through holes on the second flange are matched with the positions of the through holes on the first flange.

[0012] Further, the number of the through holes is multiple, and the multiple through holes are circumferentially distributed around the axis of the first flange.

[0013] Further, the flowmeter body further includes a perforated plate disposed in the measuring tube, and at least two pressure tapping ports are provided on the measuring tube, the pressure tapping ports are distributed on both sides of the perforated plate, and the pressure tapping ports are connected with a pressure tapping device.

[0014] Further, the pressure tapping device includes a differential pressure transmitter and a flow display instrument, the differential pressure transmitter is connected with the pressure tapping ports on both sides of the perforated plate, the signal output end of the differential pressure transmitter is connected to the input end of the controller, and the output end of the controller is signal-connected to the flow display instrument.

[0015] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0016] By providing a bellows at at least one end of the measuring tube, the bellows can change the axial length, thereby changing the axial length of the flowmeter body, enabling the flowmeter to adjust the axial dimension according to the spacing requirements between the on-site pipelines for installing the flowmeter, making the axial dimension of the flowmeter adaptable to the spacing for installing the flowmeter, and increasing the applicable scenarios of the flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be described by way of examples with reference to the accompanying drawings, wherein:

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a front view structural diagram of the first flange or the second flange;

[0020] Reference numerals in the drawings: 1 - measuring tube; 2 - perforated plate; 3 - pressure tapping port; 4 - differential pressure transmitter; 5 - flow display instrument; 6 - bellows; 7 - screw; 8 - first flange; 9 - second flange; 10 - nut; 11 - sealing groove; 12 - through hole; 13 - connection hole. Detailed implementation mode

[0021] In the description of this specification, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of this specification is usually placed during use. It is only for the convenience of describing this specification and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this specification.

[0022] In addition, in the description of this specification, if terms such as "horizontal" and "vertical" are used, it does not mean that the components are required to be absolutely horizontal or hanging vertically, but they can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0023] In the description of this specification, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components.

[0024] Embodiment 1

[0025] As Figure 1 - Figure 2 shown, a porous orifice plate balanced flowmeter includes a flowmeter body. The flowmeter body has a measuring tube 1, and at least one end of the measuring tube 1 is hermetically connected to a corrugated pipe 6. By arranging the corrugated pipe 6 at at least one end of the measuring tube 1, the corrugated pipe 6 can change the axial length, thereby changing the axial length of the flowmeter body, enabling the flowmeter to adjust the axial dimension of the flowmeter according to the spacing requirements for installing the flowmeter between on-site pipelines, so that the axial dimension of the flowmeter can adapt to the spacing for installing the flowmeter, and increasing the applicable scenarios of the flowmeter.

[0026] Optionally, one end of the measuring tube 1 is hermetically connected to a corrugated pipe 6; or both ends of the measuring tube 1 are connected to corrugated pipes 6.

[0027] Embodiment 2

[0028] On the basis of Embodiment 1, a further implementable specific implementation mode is proposed.

[0029] A feasible implementation manner is that both ends of the corrugated pipe 6 are provided with first flanges 8, and both ends of the measuring pipe 1 are provided with second flanges 9. The first flange 8 is connected to the second flange 9 to realize the connection between the measuring pipe 1 and the corrugated pipe 6. The first flange 8 and the second flange 9 can be detachably connected, which is convenient for the packaging and transportation of the porous orifice plate balanced flowmeter and also convenient for the on-site installation of the flowmeter.

[0030] A feasible implementation manner is that both the first flange 8 and the second flange 9 are provided with sealing grooves 11 for installing sealing rings. The sealing grooves 11 are annular. By assembling the sealing rings in the sealing grooves 11, the sealing rings between the first flange 8 and the second flange 9 will be compressed after the first flange 8 and the second flange 9 are connected, so as to realize the sealed connection and effectively avoid fluid leakage.

[0031] A feasible implementation manner is that the projections of the sealing grooves 11 on the first flange 8 and the sealing grooves 11 on the second flange 9 on the same flange surface have no overlapping parts, that is, one of the sealing rings is located inside the other sealing ring after installation, realizing multiple seals and improving the stability of the seal.

[0032] A feasible implementation manner is that both the first flange 8 and the second flange 9 are provided with flange connection holes 13 for bolt fastening. The positions of the flange connection holes 13 on the first flange 8 and the second flange 9 are matched. The first flange 8 and the second flange 9 are detachably connected by passing bolts through the connection holes 13 and then fastening, and further realizing the connection between the measuring pipe 1 and the corrugated pipe 6.

[0033] A feasible implementation manner is that through holes 12 are also provided on the first flange 8. There is a screw rod 7 passing through the through holes 12 on the same axis and different first flanges 8 along the axial direction of the corrugated pipe 6, and nuts 10 are connected to both ends of the screw rod 7 to lock the length of the corrugated pipe 6 by the nuts 10; by adjusting the position of the adjusting nut 10 connected to the screw rod 7, the distance between the two nuts 10 is changed, and thus the overall axial length of the flowmeter is changed; on the other hand, due to the existence of the screw rod 7, the screw rod 7 supports the corrugated pipe 6, effectively improving the strength of the corrugated pipe 6 and the position stability in the axial direction, and reducing the vibration generated when the fluid in the pipe passes through and the offset amount of the corrugated pipe 6.

[0034] A feasible implementation manner is that through holes 12 are also provided on the second flange 9, and the positions of the through holes 12 on the second flange 9 are matched with the positions of the through holes 12 on the first flange 8, so that the screw rod 7 can pass through the second flange 9 without position interference.

[0035] A feasible implementation manner is that the number of the through holes 12 is multiple, and the multiple through holes 12 are circumferentially distributed with the axis of the first flange 8 as the center to ensure uniform force.

[0036] A feasible implementation manner is that the flowmeter body further includes an orifice plate 2 disposed in the measuring pipe 1, and at least two pressure tapping ports 3 are provided on the measuring pipe 1. The pressure tapping ports 3 are distributed on both sides of the orifice plate 2. The pressure tapping ports 3 are connected to a pressure tapping device. A static pressure difference is generated between the upstream and downstream sides of the orifice plate. The pressure tapping device is used to obtain a stable differential pressure signal. According to the measured value of the pressure difference, the characteristics of the flowing fluid, and the usage environment of the device, and at the same time, based on the continuity equation and the Bernoulli equation, the numerical relationship between the static pressure difference and the fluid flow rate can be deduced to obtain the fluid flow rate.

[0037] A feasible implementation manner is that the pressure tapping device includes a differential pressure transmitter 4 and a flow display instrument 5. The differential pressure transmitter 4 is connected to the pressure tapping ports 3 on both sides of the orifice plate 2. The signal output end of the differential pressure transmitter 4 is connected to the input end of the controller, and the output end of the controller is signal-connected to the flow display instrument 5. That is, the differential pressure transmitter 4 obtains the pressure difference on both sides of the orifice plate 2 and transmits the pressure difference to the controller. After calculation by the controller, the flow data is obtained and transmitted to the flow display instrument 5 to visually present the flow value.

[0038] The present utility model is not limited to the foregoing specific implementation manners. The present utility model extends to any new feature disclosed in this specification or any new combination, as well as any new method or process step disclosed or any new combination.

Claims

1. A porous orifice plate balanced flowmeter, characterized in that: It includes a flowmeter body, and the flowmeter body has a measuring pipe (1), and at least one end of the measuring pipe (1) is hermetically connected with a corrugated pipe (6).

2. The porous orifice plate balanced flowmeter according to claim 1, wherein: Both ends of the corrugated pipe (6) are provided with first flanges (8), both ends of the measuring pipe (1) are provided with second flanges (9), and the first flange (8) is connected with the second flange (9) to realize the connection between the measuring pipe (1) and the corrugated pipe (6).

3. The porous orifice plate balanced flowmeter according to claim 2, wherein: Both the first flange (8) and the second flange (9) are provided with sealing grooves (11) for installing sealing rings, and the sealing grooves (11) are annular.

4. The porous orifice plate balanced flowmeter according to claim 3, wherein: The projection of the sealing groove (11) on the first flange (8) and the sealing groove (11) on the second flange (9) on the same flange surface has no overlapping part.

5. The porous orifice plate balanced flowmeter according to claim 2, characterized in that: Both the first flange (8) and the second flange (9) are provided with flange connection holes (13) for bolt fastening, and the positions of the flange connection holes (13) on the first flange (8) and the second flange (9) are matched.

6. The porous orifice plate balanced flowmeter according to claim 5, wherein: The first flange (8) is further provided with through holes (12), and there is a screw rod (7) passing through the through holes (12) on the same axis and different first flanges (8) along the axial direction of the corrugated pipe (6), and nuts (10) are connected to both ends of the screw rod (7) to lock the length of the corrugated pipe (6) through the nuts (10).

7. The porous orifice plate balanced flowmeter according to claim 6, wherein: The second flange (9) is also provided with through holes (12) in the same way, and the positions of the through holes (12) on the second flange (9) are matched with the positions of the through holes (12) on the first flange (8).

8. The porous orifice plate balanced flowmeter according to claim 6, wherein: The number of the through holes (12) is multiple, and the multiple through holes (12) are circumferentially distributed with the axis of the first flange (8) as the center.

9. The porous orifice plate balanced flowmeter according to claim 1, wherein: The flowmeter body further includes a perforated plate (2) arranged in the measuring pipe (1), and at least two pressure tapping ports (3) are opened on the measuring pipe (1), the pressure tapping ports (3) are distributed on both sides of the perforated plate (2), and the pressure tapping ports (3) are connected with a pressure tapping device.

10. The porous orifice plate balanced flowmeter according to claim 9, characterized in that: The pressure tapping device includes a differential pressure transmitter (4) and a flow display instrument (5), the differential pressure transmitter (4) is connected with the pressure tapping ports (3) on both sides of the perforated plate (2), the signal of the differential pressure transmitter (4) is connected to the input end of a controller, and the output end of the controller is signal-connected to the flow display instrument (5).

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