Wide-range flow measuring device

Abstract

The utility model relates to the technical field of measuring equipment, and provides a wide-range flow measuring device which is characterized by comprising a pipe body, a positioning frame, a pore plate, a regulating valve element and an elastic piece, and the pipe body is provided with an inlet end and an outlet end; the positioning frame is arranged in the pipe body; the pore plate is hermetically arranged in the pipe body, and the inner diameter of the pore plate is gradually increased from one side close to the inlet end of the pipe body to the other side; the adjusting valve element is arranged in the pore plate in a sliding mode, and the shape of the adjusting valve element is matched with that of the inner wall of the pore plate. One end of the elastic piece is connected with the positioning frame, and the other end of the elastic piece is connected with the adjusting valve element. By means of the technical scheme, the problems that in the prior art, the measuring range of a flow measuring device is generally fixed, after flowing flow exceeds the measuring range of the flow measuring device, the flow measuring device with the large measuring range needs to be replaced, time and labor are wasted, multiple flow measuring devices with different measuring ranges need to be prepared for standby application, and the measuring range of the flow measuring device is not changed are solved. And the cost is high.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring equipment, and specifically, to a wide-range flow measurement device. Background Art

[0002] A flow measurement device is a device used to detect and measure the flow rate of gas, liquid or steam passing through a pipeline, channel or other conveying system. Such devices are widely used in industrial production, environmental monitoring, energy management, scientific research and daily life to ensure the accuracy of process control, the efficiency of energy use and environmental compliance. Currently, the range of existing flow measurement devices is generally fixed. When the flowing flow exceeds the range of the flow measurement device, it is necessary to replace the flow measurement device with a larger range, which is time-consuming and laborious, and it is also necessary to prepare multiple flow measurement devices with different ranges as spares, resulting in a relatively high cost. Content of the Utility Model

[0003] The utility model provides a wide-range flow measurement device, which solves the problem in the related art that the range of the flow measurement device is generally fixed. When the flowing flow exceeds the range of the flow measurement device, it is necessary to replace the flow measurement device with a larger range, which is time-consuming and laborious, and it is also necessary to prepare multiple flow measurement devices with different ranges as spares, resulting in a relatively high cost.

[0004] The technical solution of the utility model is as follows: A wide-range flow measurement device, characterized in that it includes:

[0005] A pipe body, which has an inlet end and an outlet end;

[0006] A positioning frame, which is arranged inside the pipe body;

[0007] An orifice plate, which is hermetically arranged inside the pipe body, and the inner diameter of the orifice plate gradually increases from one side close to the inlet end of the pipe body to the other side;

[0008] A regulating valve core, which is slidably arranged inside the orifice plate, and the shape of the regulating valve core matches the inner wall shape of the orifice plate;

[0009] An elastic member, one end of which is connected to the positioning frame, and the other end of which is connected to the regulating valve core.

[0010] The orifice plate is close to the inlet end of the pipe body, and the positioning frame is close to the outlet end of the pipe body. It further includes:

[0011] A first protective sleeve, which is arranged on the positioning frame and is located outside the elastic member, and the outer diameter of the first protective sleeve is less than or equal to the maximum diameter of the regulating valve core;

[0012] The first guiding block is arranged on the regulating valve core. The elastic member is connected to the regulating valve core by means of the first guiding block. One end of the first guiding block away from the regulating valve core is inserted into the first protective sleeve and is slidably connected to the first protective sleeve.

[0013] The orifice plate is close to the outlet end of the pipe body, and the positioning frame is close to the inlet end of the pipe body. Further included is

[0014] A second protective sleeve is arranged on the positioning frame and is located outside the elastic member. The outer diameter of the second protective sleeve is less than or equal to the minimum diameter of the regulating valve core;

[0015] The second guiding block is arranged on the regulating valve core. The elastic member is connected to the regulating valve core by means of the second guiding block. One end of the second guiding block away from the regulating valve core is inserted into the second protective sleeve and is slidably connected to the second protective sleeve.

[0016] Also included is a flange. There are flanges coaxially arranged at the inlet end and the outlet end of the pipe body.

[0017] Also included is a gasket. A gasket is arranged on the end face of the flange away from the pipe body.

[0018] The flange is located outside the pipe body. One end of the gasket is arranged outside the flange, and the other end of the gasket extends between the flange and the pipe body.

[0019] Also included is a pressure transmitter. The pressure transmitter is arranged outside the pipe body. The detection end of the pressure transmitter extends into the pipe body and is located on the side of the orifice plate facing the inlet end of the pipe body.

[0020] Also included is a temperature transmitter. The temperature transmitter is arranged outside the pipe body. The detection end of the temperature transmitter extends into the pipe body and is located on the side of the orifice plate facing the outlet end of the pipe body.

[0021] Also included is a differential pressure transmitter. The differential pressure transmitter is arranged outside the pipe body. The differential pressure transmitter has a first pressure sensing port and a second pressure sensing port. The first pressure sensing port of the differential pressure transmitter is used to measure the pressure on the side of the orifice plate facing the inlet end of the pipe body, and the second pressure sensing port of the differential pressure transmitter is used to measure the pressure on the other side of the orifice plate.

[0022] The pipe body has a first pressure tapping port and a second pressure tapping port. The orifice plate is located between the first pressure tapping port and the second pressure tapping port. Further included is

[0023] The first switching valve, which is arranged at the first pressure tapping port;

[0024] The first drainage pipe, one end of which is connected to the first pressure sensing port of the differential pressure transmitter, and the other end of which is connected to the first switching valve;

[0025] The second switching valve, which is arranged at the second pressure tapping port;

[0026] The second drainage pipe, one end of which is connected to the second pressure sensing port of the differential pressure transmitter, and the other end of which is connected to the second switching valve.

[0027] The working principle and beneficial effects of the present utility model are as follows: The pipe body has an inlet end and an outlet end; the positioning frame is arranged inside the pipe body; the orifice plate is hermetically arranged inside the pipe body, and the inner diameter of the orifice plate gradually increases from one side close to the inlet end of the pipe body to the other side; the regulating valve core is slidably arranged inside the orifice plate, and the shape of the regulating valve core matches the inner wall shape of the orifice plate; one end of the elastic member is connected to the positioning frame, and the other end of the elastic member is connected to the regulating valve core. The pipe body is the main part of the whole device, which is a straight pipe section with an inlet end and an outlet end at both ends, and is used to guide the fluid to pass through. The positioning frame is fixed inside the pipe body, and its main function is to support and position other components, such as the elastic member and the regulating valve core, to ensure that they are in the correct positions. The regulating valve core is slidably arranged inside the orifice plate and can move along with the change of the fluid pressure, thereby changing the gap between the regulating valve core and the orifice plate, and further regulating the flow rate. The elastic member connects the positioning frame and the regulating valve core, provides a restoring force for the regulating valve core, and enables the regulating valve core to return to the initial position in the absence of fluid pressure.

[0028] The fluid enters the inside of the pipe body from the inlet end of the pipe body, flows out from the outlet end of the pipe body after passing through the gap between the regulating valve core and the orifice plate. When the fluid pressure increases, it will push the regulating valve core to move towards the outlet end of the pipe body, the spring is compressed, and the gap between the regulating valve core and the orifice plate increases, which can increase the flow area; when the fluid pressure decreases, the spring elongates, and the restoring force of the spring makes the regulating valve core move towards the inlet end of the pipe body, and the gap between the regulating valve core and the orifice plate decreases, which can reduce the flow area, thereby realizing the automatic regulation of the flow rate, expanding the measurement range of the flow measurement device, reducing the number of times of replacing the flow measurement device, saving time and effort, and moreover, there is no need to prepare multiple flow measurement devices with different flow rates for standby, which can save costs. Description of the Drawings

[0029] The following will further illustrate the above characteristics, technical features, advantages and their implementation manners of the present utility model in a clear and easy-to-understand manner in combination with the drawings in the preferred embodiments.

[0030] Figure 1This is a schematic diagram of the first structure of the present utility model.

[0031] Figure 2 This is a schematic diagram of the second structure of the present utility model.

[0032] Figure 3 This is a schematic diagram of the first installation structure of the pressure transmitter, temperature transmitter and differential pressure transmitter in the present utility model.

[0033] Figure 4 This is a schematic diagram of the second installation structure of the pressure transmitter, temperature transmitter and differential pressure transmitter in the present utility model.

[0034] In the figure: 1. Pipe body, 2. Positioning frame, 3. Orifice plate, 4. Control valve core, 5. Elastic member, 6. First protective sleeve, 7. First guiding block, 8. Second protective sleeve, 9. Second guiding block, 10. Flange, 11. Sealing gasket, 12. Pressure transmitter, 13. Temperature transmitter, 14. Differential pressure transmitter, 15. First shut-off valve, 16. First drainage pipe, 17. Second shut-off valve, 18. Second drainage pipe. Detailed implementation manners

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the specific implementation manners of the present utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings and other implementation manners can be obtained.

[0036] For the sake of simplicity of the drawing, only the parts related to the utility model are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, for the sake of simplicity and easy understanding of the drawing, in some drawings, for the components with the same structure or function, only one of them is schematically shown, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation, and "several" includes "two" and "more than two".

[0037] In this article, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0038] In addition, in the description of the present application, terms such as "first" and "second" are only used for differential description and cannot be construed as indicating or implying relative importance.

[0039] Example, refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 For an embodiment of the present utility model, a wide-range flow measurement device is proposed, which includes a pipe body 1, a positioning frame 2, an orifice plate 3, a regulating valve core 4, and an elastic member 5. The pipe body 1 has an inlet end and an outlet end; the positioning frame 2 is arranged inside the pipe body 1; the orifice plate 3 is hermetically arranged inside the pipe body 1, and the inner diameter of the orifice plate 3 gradually increases from one side near the inlet end of the pipe body 1 to the other side; the regulating valve core 4 is slidably arranged inside the orifice plate 3, and the shape of the regulating valve core 4 matches the inner wall shape of the orifice plate 3; one end of the elastic member 5 is connected to the positioning frame 2, and the other end of the elastic member 5 is connected to the regulating valve core 4.

[0040] In this embodiment, the pipe body 1 is the main part of the entire device, which is a straight pipe section with an inlet end and an outlet end at both ends, and is used to guide the fluid to pass through. The positioning frame 2 is fixed inside the pipe body 1, and its main function is to support and position other components, such as the elastic member 5 and the regulating valve core 4, to ensure that they are in the correct positions. The regulating valve core 4 is slidably arranged inside the orifice plate 3 and can move with the change of fluid pressure, thereby changing the gap between the regulating valve core 4 and the orifice plate 3, and further regulating the flow rate. The elastic member 5 connects the positioning frame 2 and the regulating valve core 4, and provides a restoring force for the regulating valve core 4, so that the regulating valve core 4 can return to the initial position without fluid pressure.

[0041] The fluid enters the inside of the pipe body 1 from the inlet end of the pipe body 1, passes through the gap between the regulating valve core 4 and the orifice plate 3, and then flows out from the outlet end of the pipe body 1. When the fluid pressure increases, it will push the regulating valve core 4 to move towards the outlet end of the pipe body 1, the spring is compressed, and the gap between the regulating valve core 4 and the orifice plate 3 increases, which can increase the flow area; when the fluid pressure decreases, the spring elongates, and the restoring force of the spring makes the regulating valve core 4 move towards the inlet end of the pipe body 1, and the gap between the regulating valve core 4 and the orifice plate 3 decreases, which can reduce the flow area, thereby realizing the automatic adjustment of the flow rate, expanding the measurement range of the flow measurement device, reducing the number of times of replacing the flow measurement device, saving time and effort, and moreover, there is no need to prepare multiple flow measurement devices with different flow rates for standby, which can save costs.

[0042] The first structure, such as Figure 1 and Figure 3As shown, the orifice plate 3 is close to the inlet end of the pipe body 1, and the positioning frame 2 is close to the outlet end of the pipe body 1. It further includes a first protective sleeve 6 and a first guiding block 7. The first protective sleeve 6 is arranged on the positioning frame 2 and is located outside the elastic member 5. The outer diameter of the first protective sleeve 6 is less than or equal to the maximum diameter of the regulating valve core 4. The first guiding block 7 is arranged on the regulating valve core 4. The elastic member 5 is connected to the regulating valve core 4 by means of the first guiding block 7. One end of the first guiding block 7 away from the regulating valve core 4 is inserted into the first protective sleeve 6 and is slidably connected to the first protective sleeve 6.

[0043] The elastic member 5 is located between the outlet end of the pipe body 1 and the orifice plate 3. The large-diameter end of the regulating valve core 4 faces the elastic member 5 and the first protective sleeve 6. One end of the first guiding block 7 is slidably arranged in the first protective sleeve 6, and the other end of the first guiding block 7 is connected to the large-diameter end of the regulating valve core 4. The first protective sleeve 6 is arranged on the positioning frame 2 and is located outside the elastic member 5, which can protect the elastic member 5 from external interference, such as the scouring of fluid or the collision of external objects, and can extend the service life of the elastic member 5. The outer diameter of the first protective sleeve 6 is less than or equal to the maximum diameter of the regulating valve core 4, which can serve as a guiding member to ensure that the regulating valve core 4 moves in a straight line when moving axially, and can reduce the deviation caused by fluid impact or vibration, thereby improving the accuracy of flow regulation.

[0044] The second structure is as Figure 2 and Figure 4 As shown, the orifice plate 3 is close to the outlet end of the pipe body 1, and the positioning frame 2 is close to the inlet end of the pipe body 1. It further includes a second protective sleeve 8 and a second guiding block 9. The second protective sleeve 8 is arranged on the positioning frame 2 and is located outside the elastic member 5. The outer diameter of the second protective sleeve 8 is less than or equal to the minimum diameter of the regulating valve core 4. The second guiding block 9 is arranged on the regulating valve core 4. The elastic member 5 is connected to the regulating valve core 4 by means of the second guiding block 9. One end of the second guiding block 9 away from the regulating valve core 4 is inserted into the second protective sleeve 8 and is slidably connected to the second protective sleeve 8.

[0045] The elastic member 5 is located between the inlet end of the pipe body 1 and the orifice plate 3. The small-diameter end of the regulating valve core 4 faces the elastic member 5 and the second protective sleeve 8. One end of the second guiding block 9 is slidably arranged in the second protective sleeve 8, and the other end of the second guiding block 9 is connected to the small-diameter end of the regulating valve core 4. The second protective sleeve 8 is arranged on the positioning frame 2 and is located outside the elastic member 5, which can protect the elastic member 5 from external interference, such as the scouring of fluid or the collision of external objects, and can extend the service life of the elastic member 5. The outer diameter of the second protective sleeve 8 is less than or equal to the minimum diameter of the regulating valve core 4, which can serve as a guiding member to ensure that the regulating valve core 4 moves in a straight line when moving axially, and can reduce the deviation caused by fluid impact or vibration, thereby improving the accuracy of flow regulation.

[0046] Furthermore, as Figure 1 、Figure 2 , Figure 3 and Figure 4 As shown in Figure 2 , Figure 3 and Figure 4 , it further includes a flange 10, and flanges 10 coaxial with it are provided at both the inlet end and the outlet end of the pipe body 1. The flange 10 can provide a standard connection interface, enabling the pipe body 1 to be conveniently connected to other components in the pipeline system, such as valves, pumps, other flow meters, etc. Through the flange, a good seal between the flow measurement device and the pipeline can be ensured, avoiding leakage. The use of the flange 10 makes the installation and disassembly of the flow measurement device simpler and faster, facilitating daily maintenance and inspection.

[0047] Furthermore, as Figure 3 and Figure 4 shown, it further includes a gasket 11, and the gasket 11 is provided on the end face of the flange 10 away from the pipe body 1. The material and thickness of the gasket 11 can be selected according to actual needs to adapt to the characteristics of different media, such as temperature, pressure, and corrosiveness, etc. When the flange 10 is docked with other flanges in the pipeline system, the gasket 11 can effectively prevent fluid leakage at the flange connection, ensuring the safety and reliability of the system. Good sealing performance can reduce maintenance and repair work caused by leakage, lower maintenance costs, and also help to extend the service life of the flow measurement device and its related components.

[0048] Furthermore, as Figure 3 and Figure 4 shown, the flange 10 is located on the periphery of the pipe body 1, one end of the gasket 11 is arranged outside the flange 10, and the other end of the gasket 11 extends between the flange 10 and the pipe body 1. The sealing performance between the flange 10 and the pipe body 1 can be further improved, preventing fluid leakage and ensuring a more reliable connection between the flow measurement device and the pipeline system.

[0049] Furthermore, as Figure 3 and Figure 4 shown, it further includes a pressure transmitter 12, the pressure transmitter 12 is arranged outside the pipe body 1, the detection end of the pressure transmitter 12 extends into the pipe body 1, and is located on the side of the orifice plate 3 facing the inlet end of the pipe body 1. The pressure transmitter 12 is used to monitor the pressure of the fluid in front of the orifice plate 3. Since the flow rate is related to the differential pressure and the inlet pressure, by monitoring the pressure in front of the orifice plate 3, the flow rate can be assisted in calculation to improve the measurement accuracy. Moreover, using the pressure transmitter 12 to monitor the pressure in front of the orifice plate 3 in real time helps to detect and handle possible problems in a timely manner.

[0050] Furthermore, as Figure 3 and Figure 4As shown, it further includes a temperature transmitter 13. The temperature transmitter 13 is arranged outside the pipe body 1, and the detection end of the temperature transmitter 13 extends into the pipe body 1 and is located on the side of the orifice plate 3 facing the outlet end of the pipe body 1. The temperature transmitter 13 is used to monitor the temperature of the fluid behind the orifice plate 3. Since the flow rate is related to the temperature, by monitoring the temperature behind the orifice plate 3, the flow rate can be calculated assistantly to improve the measurement accuracy. Moreover, by using the temperature transmitter 13 to monitor the temperature behind the orifice plate 3 in real time, it helps to detect and handle possible problems in a timely manner.

[0051] Furthermore, as Figure 3 and Figure 4 shown, it further includes a differential pressure transmitter 14. The differential pressure transmitter 14 is arranged outside the pipe body 1. The differential pressure transmitter 14 has a first pressure sensing port and a second pressure sensing port. The first pressure sensing port of the differential pressure transmitter 14 is used to measure the pressure on the side of the orifice plate 3 facing the inlet end of the pipe body 1, and the second pressure sensing port of the differential pressure transmitter 14 is used to measure the pressure on the other side of the orifice plate 3. The differential pressure transmitter 14 can measure the pressure difference between the two sides of the orifice plate 3. Since the flow rate is related to the differential pressure, by measuring the pressure difference between the two sides of the orifice plate 3, the flow rate can be calculated assistantly to improve the measurement accuracy. The differential pressure transmitter 14 measures the differential pressure value before and after the orifice throttling element. Combining the pressure measured by the pressure transmitter 12 and the temperature measured by the temperature transmitter 13 can further improve the accuracy of flow rate measurement. Moreover, by using the differential pressure transmitter 14 to monitor the pressure difference between the two sides of the orifice plate 3 in real time, it helps to detect and handle possible problems in a timely manner.

[0052] Furthermore, as Figure 3 and Figure 4 shown, the pipe body 1 has a first pressure tapping and a second pressure tapping. The orifice plate 3 is located between the first pressure tapping and the second pressure tapping. It further includes a first on-off valve 15, a first drain pipe 16, a second on-off valve 17, and a second drain pipe 18. The first on-off valve 15 is arranged at the first pressure tapping; one end of the first drain pipe 16 is connected to the first pressure sensing port of the differential pressure transmitter 14, and the other end of the first drain pipe 16 is connected to the first on-off valve 15; the second on-off valve 17 is arranged at the second pressure tapping; one end of the second drain pipe 18 is connected to the second pressure sensing port of the differential pressure transmitter 14, and the other end of the second drain pipe 18 is connected to the second on-off valve 17.

[0053] The first pressure tapping port is located on one side of the orifice plate 3 facing the inlet end of the pipe body 1, and the second pressure tapping port is located on one side of the orifice plate 3 facing the outlet end of the pipe body 1. The first switching valve 15 is used to control the connection between the first pressure tapping port and the first drainage pipe 16, so as to transfer the pressure on the side of the orifice plate 3 facing the inlet end of the pipe body 1 to the first pressure sensing port of the differential pressure transmitter 14 through the first drainage pipe 16. The second switching valve 17 is used to control the connection between the second pressure tapping port and the second drainage pipe 18, so as to transfer the pressure on the side of the orifice plate 3 facing the outlet end of the pipe body 1 to the second pressure sensing port of the differential pressure transmitter 14 through the second drainage pipe 18. The settings of the first switching valve 15 and the second switching valve 17 enable the corresponding pressure tapping ports to be conveniently closed during the maintenance or calibration of the differential pressure transmitter 14 without affecting the operation of the entire system. When maintaining or replacing the differential pressure transmitter 14, the corresponding switching valves can be closed, which can prevent fluid leakage and improve safety. Moreover, the cooperation of the two switching valves and the two drainage pipes can reduce the requirements for the installation position of the differential pressure transmitter 14, making the disassembly and assembly simpler and more convenient.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. Wide range flow measurement device, characterized by: include, A pipe body (1), the pipe body (1) having an inlet end and an outlet end; A positioning frame (2), the positioning frame (2) being arranged inside the tube body (1); An orifice plate (3), the orifice plate (3) being sealingly arranged in the tube body (1), the inner diameter of the orifice plate (3) gradually increasing from one side close to the inlet end of the tube body (1) to the other side; A regulating valve core (4), the regulating valve core (4) being slidably disposed in the orifice plate (3), the shape of the regulating valve core (4) matching the shape of the inner wall of the orifice plate (3); An elastic member (5), one end of the elastic member (5) being connected to the positioning frame (2), and the other end of the elastic member (5) being connected to the regulating valve core (4).

2. The wide-range flow measurement device according to claim 1, characterized in that: The orifice plate (3) is close to the inlet end of the tube body (1), and the positioning frame (2) is close to the outlet end of the tube body (1), and further comprises: a first protective sleeve (6), the first protective sleeve (6) being arranged on the positioning frame (2) and located outside the elastic member (5), the outer diameter of the first protective sleeve (6) being less than or equal to the maximum diameter of the regulating valve core (4); A first guide block (7), wherein the first guide block (7) is arranged on the regulating valve core (4), the elastic member (5) is connected to the regulating valve core (4) by means of the first guide block (7), and an end of the first guide block (7) away from the regulating valve core (4) is inserted into the first protective sleeve (6) and is slidably connected to the first protective sleeve (6).

3. The wide-range flow measurement device according to claim 1, characterized in that: The orifice plate (3) is close to the outlet end of the tube body (1), and the positioning frame (2) is close to the inlet end of the tube body (1), and further comprises: a second protective sleeve (8), the second protective sleeve (8) being arranged on the positioning frame (2) and located outside the elastic member (5), the outer diameter of the second protective sleeve (8) being smaller than or equal to the minimum diameter of the regulating valve core (4); A second guide block (9), the second guide block (9) being arranged on the regulating valve core (4), the elastic member (5) being connected to the regulating valve core (4) by means of the second guide block (9), an end of the second guide block (9) away from the regulating valve core (4) being inserted into the second protective sleeve (8) and being slidably connected to the second protective sleeve (8).

4. The wide-range flow measurement device according to claim 1, characterized in that: It also comprises a flange (10), wherein the flange (10) is coaxially arranged at the inlet end and the outlet end of the tube body (1).

5. The wide range flow measurement device according to claim 4, characterized in that: It also comprises a sealing gasket (11), which is arranged on an end surface of the flange (10) away from the tube body (1).

6. The wide range flow measurement device according to claim 5, characterized in that: The flange (10) is located outside the tube body (1), one end of the sealing gasket (11) is arranged outside the flange (10), and the other end of the sealing gasket (11) extends between the flange (10) and the tube body (1).

7. The wide-range flow measurement device according to claim 1, characterized in that: It also comprises a pressure transmitter (12), which is arranged outside the pipe body (1), and a detection end of the pressure transmitter (12) extends into the pipe body (1) and is located on a side of the orifice plate (3) facing the inlet end of the pipe body (1).

8. The wide-range flow measurement device according to claim 1, characterized in that: It also comprises a temperature transmitter (13), the temperature transmitter (13) being arranged outside the tube body (1), the detection end of the temperature transmitter (13) extending into the tube body (1) and being located on a side of the orifice plate (3) facing the outlet end of the tube body (1).

9. The wide-range flow measurement device according to claim 1, characterized in that: The differential pressure transmitter (14) is also included. The differential pressure transmitter (14) is arranged outside the pipe body (1). The differential pressure transmitter (14) has a first pressure sensing port and a second pressure sensing port. The first pressure sensing port of the differential pressure transmitter (14) is used to measure the pressure on the side of the orifice plate (3) facing the inlet end of the pipe body (1), and the second pressure sensing port of the differential pressure transmitter (14) is used to measure the pressure on the other side of the orifice plate (3).

10. The wide-range flow measurement device according to claim 9, characterized in that: The tube body (1) has a first pressure-taking port and a second pressure-taking port, the orifice plate (3) is located between the first pressure-taking port and the second pressure-taking port, and further comprises: a first switch valve (15), the first switch valve (15) being arranged at the first pressure taking port; a first drainage tube (16), one end of the first drainage tube (16) being connected to the first pressure sensing port of the differential pressure transmitter (14), and the other end of the first drainage tube (16) being connected to the first switch valve (15); a second switch valve (17), the second switch valve (17) being arranged at the second pressure taking port; A second drainage tube (18), one end of the second drainage tube (18) is connected to the second pressure sensing port of the differential pressure transmitter (14), and the other end of the second drainage tube (18) is connected to the second switch valve (17).

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