Differential pressure type flowmeter

Abstract

According to the differential pressure type flow meter, the differential pressure type flow meter is integrated with at least one of the temperature detection device and the pressure detection device, so that the integration level of the differential pressure type flow meter is improved, the field installation workload is reduced, and the installation efficiency of the differential pressure type flow meter is improved. In order to achieve the purpose, the differential pressure type flowmeter comprises a throttling device and a differential pressure transmitter, the throttling device comprises an upstream flange, a downstream flange and a connecting ring, a throttling plate is arranged on the inner wall of the connecting ring, a throttling hole is formed in the throttling plate, and the differential pressure transmitter is arranged in the throttling hole. A positive pressure side of the throttling device is arranged between the upstream flange and the throttling plate, a negative pressure side of the throttling device is arranged between the downstream flange and the throttling plate, and the pressure difference transmitter is communicated with the positive pressure side and the negative pressure side; and the connecting ring is integrated with a detection device.

Description

Technical Field

[0001] The utility model relates to the technical field of flow detection, in particular to a differential pressure flow meter. Background Art

[0002] Whether in the petroleum, chemical or metallurgical industries, differential pressure flow meters are widely used. With the development of flow meter instrument technology, people's requirements for differential pressure flow meters are getting higher and higher. When conventional differential pressure flow meters calculate flow, they need to detect the temperature of the medium through a temperature detection device; the pressure difference of the medium is detected by setting a transmitter; the pressure on the positive pressure side of the transmitter is detected by setting a pressure detection device; conventional flow meters, temperature detection devices and pressure detection devices need to be installed separately on site with the pipeline to be measured, and the installation efficiency is low. Utility Model Content

[0003] The purpose of the utility model is to provide a differential pressure flow meter, which improves the integration of the differential pressure flow meter, reduces the on-site installation workload, and improves the installation efficiency of the differential pressure flow meter by integrating the differential pressure flow meter with at least one of a temperature detection device and a pressure detection device.

[0004] To achieve the above-mentioned purpose, the utility model provides a differential pressure flowmeter, including a throttling device and a differential pressure transmitter, the throttling device includes an upstream flange, a downstream flange and a connecting ring, the inner wall of the connecting ring is provided with a throttling plate, the throttling plate is provided with a throttling hole, the positive pressure side of the throttling device is between the upstream flange and the throttling plate, the negative pressure side of the throttling device is between the downstream flange and the throttling plate, the differential pressure transmitter is connected to the positive pressure side and the negative pressure side; the connecting ring is integrated with a detection device for obtaining and calculating flow parameters.

[0005] The utility model improves the structure of the connecting ring and integrates the detection device with the connecting ring, thereby improving the overall integration of the flow meter.

[0006] Optionally, the throttle plate is provided with a plurality of throttle holes, and the throttle holes are used to balance and rectify the flow passing through the throttle plate.

[0007] Optionally, the throttle plate is provided with a first-class throttle hole and a plurality of second-class throttle holes;

[0008] The first type of throttling hole is arranged concentrically with the throttling plate, and a plurality of the second type of throttling holes are evenly distributed around the first type of throttling hole; or,

[0009] The throttle plate is provided with a plurality of second-type throttle holes, and the second-type throttle holes are distributed away from the center of the throttle plate.

[0010] Optionally, the connecting ring is provided with a first positive pressure hole communicating with the positive pressure side, and a first negative pressure hole communicating with the negative pressure side;

[0011] The connecting ring is integrated with a pressure-guiding device, which is used to be connected to a differential pressure transmitter; the pressure-guiding device includes a positive pressure-guiding pipe and a negative pressure-guiding pipe, the positive pressure-guiding pipe is welded to the first positive pressure hole, and the negative pressure-guiding pipe is welded to the first negative pressure hole.

[0012] Optionally, the positive pressure-guiding tube is built into the negative pressure-guiding tube; and two ends of the positive pressure-guiding tube axially protrude from the negative pressure-guiding tube.

[0013] Optionally, a recessed groove is provided on the outer wall of the connecting ring, and the first positive pressure hole passes through the bottom of the recessed groove; the end face of the positive pressure pipe abuts against the bottom of the groove and is welded to the recessed groove.

[0014] Optionally, the connecting ring is provided with a first mounting countersunk hole, a first tubular joint is welded to the first mounting countersunk hole, a mounting channel is provided to the first joint, the mounting channel is connected to the negative pressure side of the throttling device, and the mounting channel is used to install the temperature detection device.

[0015] Optionally, the temperature detection device includes a detection head and a connecting portion connected to each other, the detection head is inserted into the throttling device through the installation channel, and the connecting portion is connected to the first joint to block the installation channel.

[0016] Optionally, the connecting ring is provided with a second mounting countersunk hole, and the second mounting countersunk hole is communicated with the positive pressure side of the throttling device;

[0017] The pressure detection device comprises a second joint, one end of which is welded to the second mounting countersunk hole, and the other end of which is connected to the pressure sensor via a pressure valve.

[0018] Optionally, the throttling device further includes an upstream metal wound gasket, a downstream metal wound gasket and a fastener;

[0019] The upstream flange is connected to the downstream flange via the fasteners, the connecting ring is located between the upstream flange and the downstream flange, the upstream flange and the connecting ring are sealed via the upstream metal wound gasket, and the downstream flange and the connecting ring are sealed via the downstream metal wound gasket.

[0020] Optionally, the connecting ring is integrated with the pressure detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0022] Figure 1 It is an exploded view of the differential pressure flow meter in the embodiment of the utility model;

[0023] Figure 2 It is an exploded view of the flow device;

[0024] Figure 3 It is an enlarged view of the connecting ring;

[0025] Figure 4 It is an exploded diagram of the temperature detection device;

[0026] Figure 5 It is an exploded diagram of the pressure detection device;

[0027] Figure 6 This is an exploded view of the pressure-inducing device;

[0028] Figure 7 It is a top view of one end of the valve group device;

[0029] Figure 8 It is a top view of the other end of the valve group device.

[0030] Figure 1-Figure 8 middle:

[0031] 100, throttling device; 101, upstream flange; 102, upstream metal winding gasket; 103, throttling piece; 103a, connecting ring; 103b, throttling plate; 103b-1, first type throttling hole; 103b-2, second type throttling hole; 104, downstream metal winding gasket; 105, fastener; 106, downstream flange; 107, second mounting countersunk hole; 108, first positive pressure hole; 109, first negative pressure hole; 110, first mounting countersunk hole;

[0032] 200, pressure detection device, 201, second connector; 202, pressure valve; 203, pressure sensor;

[0033] 300, temperature detection device; 301, first joint; 302, detection head; 303, connection part;

[0034] 400, pressure-inducing device; 401, negative pressure-inducing pipe; 402, positive pressure-inducing pipe;

[0035] 500, valve group device; 501, second positive pressure hole; 502, second negative pressure hole; 503, third positive pressure hole; 504, third negative pressure hole;

[0036] 600. Differential pressure transmitter. DETAILED DESCRIPTION

[0037] The purpose of the utility model is to provide a differential pressure flow meter, which improves the integration of the differential pressure flow meter, reduces the on-site installation workload, and improves the installation efficiency of the differential pressure flow meter by integrating the differential pressure flow meter with at least one of a temperature detection device and a pressure detection device.

[0038] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0039] Relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0040] Please refer to Figure 1-Figure 3 , Figure 1 It is an exploded view of the differential pressure flow meter in the embodiment of the utility model; Figure 2 It is an exploded view of the flow device; Figure 3 It is an enlarged view of the connecting ring; as shown in the figure, the differential pressure flowmeter of the utility model includes a throttling device 100, a differential pressure transmitter 600, a temperature detection device 300 and a valve group device 500. The throttling device 100 is connected to the pipeline to be measured. Specifically, the throttling device 100 includes an upstream flange 101, a downstream flange 106 and a connecting ring 103a. The upstream flange 101 and the downstream flange 106 are used to communicate with the pipeline. The upstream flange 101 and the downstream flange 106 are connected by a fastener 105; the connecting ring 103a is located between the upstream flange 101 and the downstream flange 106. At the same time, the upstream flange 101 and the connecting ring 103a are sealed by an upstream metal winding gasket 102, and the downstream flange 106 and the connecting ring 103a are sealed by a downstream metal winding gasket 104; the middle part of the connecting ring 103a is provided with a throttling plate 103b, and the throttling plate 103b and the connecting ring 103a are connected to the connecting ring 103a. 03a is connected to the inner wall, and the throttle plate 103b is provided with a throttling hole; that is, the connecting ring 103a and the throttle plate 103b together constitute a structure with an axial cross-section that is approximately H-shaped, the positive pressure side of the throttling device 100 is between the upstream flange 101 and the throttle plate 103b, and the negative pressure side of the throttling device 100 is between the downstream flange 106 and the throttle plate 103b; during the operation of the throttling device 100, the flow beam flowing through the throttle plate 103b can be locally contracted, thereby increasing its flow rate, so that a pressure drop is generated before and after the throttling member 103, the positive pressure side is located upstream of the throttling device 100, that is, the front side of the throttling device 100, and the negative pressure side is located downstream of the throttling device 100, that is, the rear side of the throttling device 100; the differential pressure transmitter 600 is connected to the positive pressure side and the negative pressure side of the throttling device 100, thereby obtaining the pressure difference value upstream and downstream of the throttling device 100.

[0041] In this embodiment, the specific structure of the throttle plate 103b is improved. Specifically, the throttle plate 103b is provided with a plurality of throttling holes, and the throttling holes are used to balance and rectify the flow passing through it; wherein, the "several" refers to the case where the number is greater than or equal to 2, that is, the throttling holes in the present application can be 2, 3, 4 or 6; for example, as shown in the accompanying drawings, the throttle plate 103b is provided with a first type of throttling hole 103b-1 and a plurality of second type of throttling holes 103b-2; the first type of throttling hole 103b-1 is concentrically arranged with the throttle plate 103b, and the plurality of second type of throttling holes 103b-2 are evenly distributed around the first type of throttling hole 103b-1. Here, the structure, number, etc. of the first type of throttling holes 103b-1 and the second type of throttling holes 103b-2 are not limited, so as to achieve balanced rectification of the flow beam flowing through the throttling plate 103b; of course, the first type of throttling holes 103b-1 may not be set, and the throttling plate 103b may be provided with a plurality of second type of throttling holes 103b-2, and the second type of throttling holes 103b-2 are distributed away from the center of the throttling plate 103b; that is, each throttling hole is not located at the center of the throttling plate 103b; in this embodiment, the specific number of the plurality of throttling holes is calculated on the premise that the throttling device 100 meets the same accuracy level requirements, in accordance with the principle that the throttling area of ​​the plurality of throttling holes needs to be equal to the area when the throttling plate 103 is only provided with one throttling hole; when a plurality of throttling holes are set, compared with only one throttling hole, the plurality of throttling holes can be closer to the edge of the throttling plate 103b, so that The flow beam is made more uniform, and the disturbance of the throttle plate 103b on the positive pressure side and the negative pressure side is reduced, especially the disturbance on the negative pressure side. On the one hand, the accuracy and stability of the pressure measurement value on the negative pressure side can be improved, and the fluctuation range of the pressure difference can be reduced, thereby improving the range ratio, especially improving the stability and accuracy of low flow detection (after testing, at the same accuracy level, when the throttle plate 103b is provided with a single hole, the range ratio that can be measured by the differential pressure flowmeter is 3:1, and when the technical solution in the present application is adopted, the range ratio that can be measured by the differential pressure flowmeter is 10:1); on the other hand, the axial length of the connecting ring 103a can be shortened. The throttle plate 103a with a conventional single throttle hole causes a large disturbance, so a connecting ring 103a with a longer axial length is required to rectify the flow beam. Since the throttle plate 103b in the present solution has a small disturbance on the flow beam, the axial size of the connecting ring 103a is shortened.

[0042] In this embodiment, on the other hand, the structure of the connecting ring 103a is improved, and the connecting ring 103a is integrated with the detection device. For example, the temperature detection device 300 and / or the pressure detection device 200 are integrated with the connecting ring 103a, thereby improving the overall integration of the flow meter. Different parts are used below to illustrate the integration method of the temperature detection device 300 and the pressure detection device 200 with the connecting ring 103a.

[0043] See also Figure 2-Figure 4 , Figure 2 It is an exploded view of the flow device; Figure 3 It is an enlarged view of the connecting ring; Figure 4 It is an exploded diagram of the temperature detection device.

[0044] Specifically, the connecting ring 103a is provided with a first mounting countersunk hole 110, and the first mounting countersunk hole 110 refers to a structure in which a groove is provided on the outer wall of the connecting ring 103a, and a through hole is provided at the bottom of the groove; the first mounting countersunk hole 110 is welded with a tubular first joint 301, and the first joint 301 is a hollow tube. The inner cavity of the first joint 301, that is, the tube cavity, is provided with an mounting channel, and the temperature detection device 300 is inserted into the throttling device 100 through the mounting channel; the mounting channel is connected to the positive pressure side or the negative pressure side of the throttling device 100, that is, the first mounting countersunk hole 110 is located on the positive pressure side or the negative pressure side. When the first mounting countersunk hole 110 is located on the negative pressure side, it can avoid the temperature detection device 300 from interfering with the flow beam.

[0045] The temperature detection device 300 includes a detection head 302 and a connecting part 303. The connecting part 303 is arranged at the end of the detection head 302, and the detection head 302 is used to detect the temperature of the flow stream; the detection head 302 extends into the throttling device 100 through the installation channel, and the connecting part 303 is used to be threadedly connected to the other end of the first joint 301, so as to form a fluid seal in the installation channel. In addition to the threaded connection method, it can also be a snap-on connection, a plug-in connection, etc., and here it is based on the ability to achieve fluid sealing.

[0046] See also Figure 2 , Figure 3 and Figure 5 , Figure 5 It is an exploded view of the pressure detection device; the connecting ring 103a is provided with a second mounting countersunk hole 107, which is connected to the positive pressure side of the throttling device 100; the pressure detection device 200 includes a second joint 201, one end of which is welded to the second mounting countersunk hole 107, and the other end is connected to the pressure sensor 203 through a pressure valve 202. Of course, the connecting ring 103a can integrate the temperature detection device 300 and the pressure detection device 200, or only integrate one of them, and those skilled in the art can choose according to their needs.

[0047] In the above embodiments, please combine Figure 1 and Figure 2 , and combined with Figure 6-Figure 8 , Figure 6 This is an exploded view of the pressure-inducing device; Figure 7 It is a top view of one end of the valve group device; Figure 8It is a top view of the other end of the valve group device; the valve group device 500 is connected between the differential pressure transmitter 600 and the throttling device 100, and the valve group device 500 is specifically an integrated three-valve group, which further simplifies the wiring and improves the integration; wherein, the integrated three-valve group specifically includes a valve body, two stop valves and a balancing valve, the left side is a high-pressure valve, the flow channel formed by the high-pressure valve is a positive-pressure flow channel, the right side is a low-pressure valve, the flow channel formed by the low-pressure valve is a negative-pressure flow channel, the positive-pressure flow channel is connected to the positive-pressure measuring chamber of the differential pressure transmitter 600; the negative-pressure flow channel is used to connect to the negative-pressure measuring chamber of the differential pressure transmitter 600; that is, the high-pressure valve is connected between the positive-pressure measuring chamber and the high-pressure side, thereby realizing the high-pressure side and the positive-pressure side. The connection or disconnection of the pressure measuring chamber; the low-pressure valve is connected between the negative pressure measuring chamber and the low-pressure side, thereby realizing the connection or disconnection of the low-pressure side and the negative pressure measuring chamber; in the present application, in order to further reduce the occupied space of the flow meter and simplify the wiring, a differential pressure transmitter 600 is arranged on the upper side of the valve group device 500, and a throttling device 100 is arranged on the lower side, that is, the throttling device 100 and the differential pressure transmitter 600 are respectively arranged on the upper and lower sides of the valve group device 500, wherein the upper and lower directions of the valve group device 500, that is, the upper and lower directions in the figure, correspond to the radial direction of the flange of the throttling device 100, and at the same time, in order to further improve the integration, the throttling device 100 is abutted against the valve group device 500 and threadedly connected.

[0048] In another embodiment, see Figure 1 and Figure 6 The differential pressure flowmeter also includes a pressure-guiding device 400, which includes a positive pressure-guiding tube 402 and a negative pressure-guiding tube 401. The diameter of the positive pressure-guiding tube 402 is smaller than that of the negative pressure-guiding tube 401, and the negative pressure-guiding tube 401 is sleeved on the outside of the positive pressure-guiding tube 402; thereby simplifying the structural arrangement of the guide tubes, and only one pressure-guiding tube can be seen on the outside of the flowmeter, and the pressure-guiding tube is made of metal, which has greater structural strength and can also play a certain supporting role; wherein, the inner cavity of the positive pressure-guiding tube 402 defines a first flow channel, and the positive pressure-guiding tube A second flow channel is defined between 402 and the negative pressure pipe 401, and the first flow channel is spaced from the second flow channel; the first flow channel connects the positive pressure side of the throttling device 100 with the positive pressure flow channel, and the second flow channel is used to connect the negative pressure side of the throttling device 100 with the negative pressure flow channel; one end of the positive pressure pipe 402 and the negative pressure pipe 401 are welded to the throttling device 100, and the other end is welded to the valve body, and a seal is formed by welding, thereby achieving fluid sealing for the two flow channels. The welding method can be selected by technicians in this field and is not specifically limited here.

[0049] Specifically, in order to weld with the pressure-conducting pipe, the present application further improves the specific structure of the throttling device 100. Since the two pressure-conducting pipes in the present application are socketed, it is crucial to avoid interference between the two pressure-conducting pipes during welding.

[0050] The connecting ring 103a is provided with a first positive pressure hole 108 connected to the positive pressure side and a first negative pressure hole 109 connected to the negative pressure side. The first positive pressure hole 108 is used to communicate with the first flow channel, and the first negative pressure hole 109 is used to communicate with the second flow channel. When projected in the axial direction of the pressure-inducing pipe, the first positive pressure hole 108 is located within the projection range of the first flow channel, and the first negative pressure hole 109 is located within the projection range of the second flow channel. Here, the specific shapes and quantities of the first positive pressure hole 108 and the first negative pressure hole 109 are not limited. The positive pressure-inducing pipe 4 02 has an axial dimension greater than that of the negative pressure tube 401, and both ends of the positive pressure tube 402 extend out from the negative pressure tube 401; in order to match the positive pressure tube 402, a groove is provided on the outer wall of the connecting ring 103a, and the first positive pressure hole 108 passes through the bottom of the groove; the end face of the positive pressure tube 402 abuts against the bottom of the groove and is welded to the groove; similarly, a second positive pressure hole 501 and a second negative pressure hole 502 are provided on the lower wall of the valve body, and a groove is also provided on the lower wall of the valve body, and the second positive pressure hole 501 is located at the bottom of the groove.

[0051] The specific welding process is:

[0052] First, when welding the pressure-inducing device 400, one end of the positive pressure-inducing pipe 402 is firstly abutted against the groove bottom of the valve assembly device 500 and the groove bottom of the connecting ring 103a, and the second positive pressure hole 501 or the first positive pressure hole 108 on the corresponding side is covered, and the end of the positive pressure-inducing pipe 402 is welded to the corresponding side sink groove;

[0053] Then, after the negative pressure pipe 401 is sleeved onto the positive pressure pipe 402, since the axial dimension of the negative pressure pipe 401 is smaller than that of the positive pressure pipe 402, the unwelded end of the positive pressure pipe 402 can extend out of the negative pressure pipe 401. At this time, the unwelded end of the positive pressure pipe 402 is abutted against the other of the groove bottom of the valve assembly device 500 and the groove bottom of the connecting ring 103a, and covers the first positive pressure hole 108 or the second positive pressure hole 501 on the corresponding side, and the end of the positive pressure pipe 402 is welded to the corresponding sink groove;

[0054] At this time, weld the end of the negative pressure tube 401 to the lower wall of the valve body, and ensure that the negative pressure tube 401 covers the second negative pressure hole 502; weld the other end of the negative pressure tube 401 to the outer wall of the connecting ring 103a, and ensure that the negative pressure tube 401 covers the first negative pressure hole 109.

[0055] In this embodiment, a corresponding third positive pressure hole 503 and a third negative pressure hole 504 are opened on the upper wall of the valve body, and the third positive pressure hole 503 and the third negative pressure hole 504 are connected to the positive pressure measuring chamber and the negative pressure measuring chamber of the corresponding differential pressure transmitter 600.

[0056] The differential pressure flowmeter provided by the utility model is introduced in detail above. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A differential pressure flow meter, characterized in that: It includes a differential pressure transmitter and a throttling device, the throttling device includes an upstream flange, a downstream flange and a connecting ring, the inner wall of the connecting ring is provided with a throttling plate, and the throttling plate is provided with a throttling hole; the positive pressure side of the throttling device is between the upstream flange and the throttling plate, the negative pressure side of the throttling device is between the downstream flange and the throttling plate, the differential pressure transmitter is connected with the positive pressure side and the negative pressure side; the connecting ring is integrated with a detection device.

2. The differential pressure flow meter according to claim 1, characterized in that: The throttle plate is provided with a plurality of throttle holes, and the throttle holes are used to balance and rectify the flow passing through the throttle plate.

3. The differential pressure flow meter according to claim 2, characterized in that: The throttle plate is provided with a first-class throttle hole and a plurality of second-class throttle holes; The first type of throttling hole is arranged concentrically with the throttling plate, and a plurality of the second type of throttling holes are evenly distributed around the first type of throttling hole; or, The throttle plate is provided with a plurality of second-type throttle holes, and the second-type throttle holes are distributed away from the center of the throttle plate.

4. The differential pressure flow meter according to any one of claims 1 to 3, characterized in that: The connecting ring is provided with a first positive pressure hole communicating with the positive pressure side and a first negative pressure hole communicating with the negative pressure side; The connecting ring is integrated with a pressure-guiding device, which is used to be connected to a differential pressure transmitter; the pressure-guiding device includes a positive pressure-guiding pipe and a negative pressure-guiding pipe, the positive pressure-guiding pipe is welded to the first positive pressure hole, and the negative pressure-guiding pipe is welded to the first negative pressure hole.

5. The differential pressure flow meter according to claim 4, characterized in that: The positive pressure-guiding tube is built in the negative pressure-guiding tube; and two ends of the positive pressure-guiding tube axially protrude from the negative pressure-guiding tube.

6. The differential pressure flow meter according to claim 5, characterized in that: A recessed groove is formed on the outer wall of the connecting ring, and the first positive pressure hole passes through the bottom of the recessed groove; the end surface of the positive pressure-guiding pipe abuts against the bottom of the groove and is welded to the recessed groove.

7. The differential pressure flow meter according to any one of claims 1 to 3, characterized in that: The connecting ring is provided with a first mounting countersunk hole, a first tubular joint is welded to the first mounting countersunk hole, and the first joint is provided with an mounting channel, the mounting channel is connected to the negative pressure side of the throttling device, and the mounting channel is used to install the temperature detection device.

8. The differential pressure flow meter according to claim 7, characterized in that: The temperature detection device comprises a detection head and a connection part connected to each other. The detection head is inserted into the throttling device through the installation channel. The connection part is connected to the first joint to block the installation channel.

9. The differential pressure flow meter according to any one of claims 1 to 3, characterized in that: The connecting ring is provided with a second mounting countersunk hole, and the second mounting countersunk hole is communicated with the positive pressure side of the throttling device; It also includes a pressure detection device, which includes a second joint, one end of which is welded to the second mounting countersunk hole, and the other end of which is connected to the pressure sensor through a pressure valve.

10. The differential pressure flow meter according to any one of claims 1 to 3, characterized in that: The throttling device also includes an upstream metal wound gasket, a downstream metal wound gasket and a fastener; The upstream flange is connected to the downstream flange via the fasteners, the connecting ring is located between the upstream flange and the downstream flange, the upstream flange and the connecting ring are sealed via the upstream metal wound gasket, and the downstream flange and the connecting ring are sealed via the downstream metal wound gasket.

11. The differential pressure flow meter according to any one of claims 1 to 3, characterized in that: The connecting ring is integrated with a pressure detection device.

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